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1 This paper focuses on the implementation of the gear compressor, working principle and operational test results.
2 Gear Compressor Implementation According to Bernoulli's theorem, the pressure potential energy of the fluid can be completely transformed in the injection. The larger the pressure difference is, the higher the jet velocity is, and the two are linear. As the pressure in the cogging gradually rises, the injection gradually weakens and ends. Due to the effect of the injection, the gear torque is reduced and the compressor shaft power is reduced.
From the above analysis, it is possible to solve the first problem with high pressure injection, and the key is to reduce the loss. The current indication efficiency of the current working condition of the piston refrigeration compressor is 0835085, and the rework efficiency of the gear compressor should reach this level. The streamlined shrink slit has a jetting efficiency of 098, which solves the problem completely.
In the past, the traditional method of relying solely on mechanical seals was used to build an oil pool in the lower part of the exhaust chamber to completely block the high and low pressure chambers. The compressor only dealt with oil leakage. The gas in the exhaust chamber does not penetrate the oil pool. The amount of oil leaking into the suction chamber during operation should be equal to that of the gear type oil pump, as long as the gas is not dissolved in the oil in a large amount. Compared with the piston type, this method has no clearance, no suction and exhaust valve, no air gap, and high gas transmission coefficient (value).
In addition to solving the above two problems, engine oil has a third important role. One way of high pressure injection is the cold oil from the oil separation cooler, whose temperature is close to the ambient temperature. The specific heat and specific gravity of the oil is much greater than the gas. The gas will cool down by a few dozen degrees. The gas is mixed, compressed and cooled by the cold oil, the temperature does not rise significantly, and the discharge temperature is close to the ambient temperature, so that cold exhaust can be achieved. The low discharge temperature also helps to improve the separation effect of the oil and is beneficial to the safe operation of the compressor. In a refrigeration system, the oil separation cooler actually performs part of the function of the condenser, that is, the cooling of the high temperature exhaust gas. However, it cools the gas in the internal tooth gap before the exhaust, which is a special feature of this solution, and also reduces the compression work.
3 Gear Compressor Working Principle The first injection slit is supplied with oil from the oil separation cooler. The pressure difference is the largest (Pk-P0), the injection is the most intense, and the cogging thrust is the largest. After the injection, the pressure in the cogging is increased from P0=024 MPa to 036 MPa. The second injection slit supplies oil from the oil pool of the exhaust chamber, and the cogging pressure rises to 070 MPa after the injection. The third injection slit is a jet, from The exhaust chamber air tank is supplied with high-pressure steam. After the injection, the pressure in the cogging rises to Pk, that is, 117 MPa, the pressure difference disappears, and the injection stops. It can be seen that the amount of work of the high pressure fluid during the injection process has a change from (Pk-P0) to zero. Then, the high-pressure tooth groove enters the exhaust chamber, and the gas inside is driven out of the tooth groove by the oil of the oil pool, occupying the volume of the lower part of the exhaust chamber, and pushing the high-pressure gas in the upper part of the exhaust chamber out of the compressor. The gullet continues to be immersed and then meshed from bottom to top and corresponding teeth below the oil level, and the oil filled in the gullet is again displaced from the bottom to the upper by the meshing teeth. This process is identical to the gear pump. When the tooth groove that has drained the oil enters the suction chamber, the inflation is restarted, so that the working process of the compressor is continuously repeated. The oil injected into the cogging is concentrated at the crest behind the tooth groove due to the centrifugal force, effectively preventing the backflow of gas in the tooth groove.
Since the direction of the centrifugal force and the direction of the spray are at an angle of 90, the accumulation of oil does not block the injection. Finally, the oil is plunged into the oil pool by the cogging speed at the top speed ve, so that the impact of the high-speed oil on the oil surface is transmitted to the bottom of the oil pool, increasing the thrust on the meshing teeth, reducing the gear torque, and absorbing the fuel injection belt. The remaining kinetic energy of the speed. The oil level of the oil sump is controlled by the overflow plate of the vent. The excess oil flows over the overflow plate down the bottom of the horizontal exhaust pipe back to the oil separation cooler. It can be seen that the oil sump of the compressor is an important mechanism, which has four kinetic energys such as strengthening the tooth lubrication, oil seal, driving out the cogging, and absorbing the remaining injection oil.
The exhaust gas of the compressor enters the oil separation cooler, where it is washed and cooled by cold oil to remove oil. The bubble rises to the oil level, and becomes a low-speed airflow, losing the ability to carry oil. Since the temperature is not high, it is close to the ambient temperature, and there is no oil vapor (in the vapor refrigeration system, the exhaust gas is saturated steam here). A clean saturated gas decondenser dissipates heat. The oil separated from the exhaust gas and the oil returned from the oil sump overflow plate are cooled by the water pipe to be cooled, and then sent back to the first injection slit of the compressor by the oil pipe, and re-injected into the tooth groove, which is repeated. If it is accidental, the cogging is not filled with gas but liquid or oil in the suction chamber, then it does not matter.
4Thermal characteristics of geared compressors (1) Breaking the tradition of first exhausting and then cooling the compressor, fully synchronizing compression and cooling, first cooling and then exhausting. The compression index is small and the power consumption is low. At present, various rotary compressors are mainly based on mechanical compression, and the fuel injection amount is small, and the discharge temperature is much higher than the ambient temperature.
(2) The mechanical seal is changed to an oil seal, the gas leakage is basically eliminated, the volumetric efficiency is high, and the gas transmission coefficient (value) is large.
(3) Compared with the screw compressor, equal volume compression and isovolumic expansion do not occur in the operation of the gear compressor. When the pressure in the cogging does not rise to Pk, the injection does not stop. When the pressure reaches Pk, the pressure difference disappears and the injection cannot continue. The final pressure of compression in the cogging can only be the discharge pressure Pk.
(6) Since the cogging gas transmission process is always closed, in the initial stage of supercharging, a large amount of gas with different pressures is sucked up first, and then the oil is injected. The intermediate suction injection into the tooth gap also has the above functions of reducing power, supercharging and cooling.
(7) In addition to reducing losses, multiple refrigeration systems can also realize a specific function of a refrigeration compressor while carrying several refrigeration temperatures. In the case of multiple levels of required temperature, such as household refrigerators, the installation of this special refrigerator can fully achieve the close proximity of the evaporating temperature of each level with the required temperature of the various levels, and the result is naturally power saving, and Reduce the working volume and reduce the size of the machine.
The special losses of geared compressors are: injected oil, oil leakage during operation, fluid injection loss and loss caused by high-speed agitation of the oil pool. According to preliminary calculation and analysis, the sum of the values ​​is less than the first point. The work saved by exhausting N.
Geared compressors are easy to manufacture and require the same precision as geared oil pumps. The gear is mainly subjected to radial force, the axial thrust is small, and the assembly process is easy. The oil is mainly responsible for five functions: lubrication, sealing, compression, rework, and cooling.
5 Runability test The test sample is a self-made external gear type compressor. The compression gear is two identical straight tooth involute shift gears. Modulus m=5, 10 teeth, displacement coefficient d=04126, gear thickness b=50mm, rotation speed n=1440r/min. The cogging volume is calculated as Vth=2826(R2-R-t2h/12) as Vo=6826m3 /h.
2 Gear Compressor Implementation According to Bernoulli's theorem, the pressure potential energy of the fluid can be completely transformed in the injection. The larger the pressure difference is, the higher the jet velocity is, and the two are linear. As the pressure in the cogging gradually rises, the injection gradually weakens and ends. Due to the effect of the injection, the gear torque is reduced and the compressor shaft power is reduced.
From the above analysis, it is possible to solve the first problem with high pressure injection, and the key is to reduce the loss. The current indication efficiency of the current working condition of the piston refrigeration compressor is 0835085, and the rework efficiency of the gear compressor should reach this level. The streamlined shrink slit has a jetting efficiency of 098, which solves the problem completely.
In the past, the traditional method of relying solely on mechanical seals was used to build an oil pool in the lower part of the exhaust chamber to completely block the high and low pressure chambers. The compressor only dealt with oil leakage. The gas in the exhaust chamber does not penetrate the oil pool. The amount of oil leaking into the suction chamber during operation should be equal to that of the gear type oil pump, as long as the gas is not dissolved in the oil in a large amount. Compared with the piston type, this method has no clearance, no suction and exhaust valve, no air gap, and high gas transmission coefficient (value).
In addition to solving the above two problems, engine oil has a third important role. One way of high pressure injection is the cold oil from the oil separation cooler, whose temperature is close to the ambient temperature. The specific heat and specific gravity of the oil is much greater than the gas. The gas will cool down by a few dozen degrees. The gas is mixed, compressed and cooled by the cold oil, the temperature does not rise significantly, and the discharge temperature is close to the ambient temperature, so that cold exhaust can be achieved. The low discharge temperature also helps to improve the separation effect of the oil and is beneficial to the safe operation of the compressor. In a refrigeration system, the oil separation cooler actually performs part of the function of the condenser, that is, the cooling of the high temperature exhaust gas. However, it cools the gas in the internal tooth gap before the exhaust, which is a special feature of this solution, and also reduces the compression work.
3 Gear Compressor Working Principle The first injection slit is supplied with oil from the oil separation cooler. The pressure difference is the largest (Pk-P0), the injection is the most intense, and the cogging thrust is the largest. After the injection, the pressure in the cogging is increased from P0=024 MPa to 036 MPa. The second injection slit supplies oil from the oil pool of the exhaust chamber, and the cogging pressure rises to 070 MPa after the injection. The third injection slit is a jet, from The exhaust chamber air tank is supplied with high-pressure steam. After the injection, the pressure in the cogging rises to Pk, that is, 117 MPa, the pressure difference disappears, and the injection stops. It can be seen that the amount of work of the high pressure fluid during the injection process has a change from (Pk-P0) to zero. Then, the high-pressure tooth groove enters the exhaust chamber, and the gas inside is driven out of the tooth groove by the oil of the oil pool, occupying the volume of the lower part of the exhaust chamber, and pushing the high-pressure gas in the upper part of the exhaust chamber out of the compressor. The gullet continues to be immersed and then meshed from bottom to top and corresponding teeth below the oil level, and the oil filled in the gullet is again displaced from the bottom to the upper by the meshing teeth. This process is identical to the gear pump. When the tooth groove that has drained the oil enters the suction chamber, the inflation is restarted, so that the working process of the compressor is continuously repeated. The oil injected into the cogging is concentrated at the crest behind the tooth groove due to the centrifugal force, effectively preventing the backflow of gas in the tooth groove.
Since the direction of the centrifugal force and the direction of the spray are at an angle of 90, the accumulation of oil does not block the injection. Finally, the oil is plunged into the oil pool by the cogging speed at the top speed ve, so that the impact of the high-speed oil on the oil surface is transmitted to the bottom of the oil pool, increasing the thrust on the meshing teeth, reducing the gear torque, and absorbing the fuel injection belt. The remaining kinetic energy of the speed. The oil level of the oil sump is controlled by the overflow plate of the vent. The excess oil flows over the overflow plate down the bottom of the horizontal exhaust pipe back to the oil separation cooler. It can be seen that the oil sump of the compressor is an important mechanism, which has four kinetic energys such as strengthening the tooth lubrication, oil seal, driving out the cogging, and absorbing the remaining injection oil.
The exhaust gas of the compressor enters the oil separation cooler, where it is washed and cooled by cold oil to remove oil. The bubble rises to the oil level, and becomes a low-speed airflow, losing the ability to carry oil. Since the temperature is not high, it is close to the ambient temperature, and there is no oil vapor (in the vapor refrigeration system, the exhaust gas is saturated steam here). A clean saturated gas decondenser dissipates heat. The oil separated from the exhaust gas and the oil returned from the oil sump overflow plate are cooled by the water pipe to be cooled, and then sent back to the first injection slit of the compressor by the oil pipe, and re-injected into the tooth groove, which is repeated. If it is accidental, the cogging is not filled with gas but liquid or oil in the suction chamber, then it does not matter.
4Thermal characteristics of geared compressors (1) Breaking the tradition of first exhausting and then cooling the compressor, fully synchronizing compression and cooling, first cooling and then exhausting. The compression index is small and the power consumption is low. At present, various rotary compressors are mainly based on mechanical compression, and the fuel injection amount is small, and the discharge temperature is much higher than the ambient temperature.
(2) The mechanical seal is changed to an oil seal, the gas leakage is basically eliminated, the volumetric efficiency is high, and the gas transmission coefficient (value) is large.
(3) Compared with the screw compressor, equal volume compression and isovolumic expansion do not occur in the operation of the gear compressor. When the pressure in the cogging does not rise to Pk, the injection does not stop. When the pressure reaches Pk, the pressure difference disappears and the injection cannot continue. The final pressure of compression in the cogging can only be the discharge pressure Pk.
(6) Since the cogging gas transmission process is always closed, in the initial stage of supercharging, a large amount of gas with different pressures is sucked up first, and then the oil is injected. The intermediate suction injection into the tooth gap also has the above functions of reducing power, supercharging and cooling.
(7) In addition to reducing losses, multiple refrigeration systems can also realize a specific function of a refrigeration compressor while carrying several refrigeration temperatures. In the case of multiple levels of required temperature, such as household refrigerators, the installation of this special refrigerator can fully achieve the close proximity of the evaporating temperature of each level with the required temperature of the various levels, and the result is naturally power saving, and Reduce the working volume and reduce the size of the machine.
The special losses of geared compressors are: injected oil, oil leakage during operation, fluid injection loss and loss caused by high-speed agitation of the oil pool. According to preliminary calculation and analysis, the sum of the values ​​is less than the first point. The work saved by exhausting N.
Geared compressors are easy to manufacture and require the same precision as geared oil pumps. The gear is mainly subjected to radial force, the axial thrust is small, and the assembly process is easy. The oil is mainly responsible for five functions: lubrication, sealing, compression, rework, and cooling.
5 Runability test The test sample is a self-made external gear type compressor. The compression gear is two identical straight tooth involute shift gears. Modulus m=5, 10 teeth, displacement coefficient d=04126, gear thickness b=50mm, rotation speed n=1440r/min. The cogging volume is calculated as Vth=2826(R2-R-t2h/12) as Vo=6826m3 /h.
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