CN215256693U - Low-voltage starting refrigeration compressor - Google Patents
Low-voltage starting refrigeration compressor Download PDFInfo
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- CN215256693U CN215256693U CN202120453768.XU CN202120453768U CN215256693U CN 215256693 U CN215256693 U CN 215256693U CN 202120453768 U CN202120453768 U CN 202120453768U CN 215256693 U CN215256693 U CN 215256693U
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Abstract
The utility model discloses a low-voltage starting refrigeration compressor, which comprises a crankcase, a piston, a valve plate, a cylinder cover and an auxiliary variable-volume device, wherein the crankcase is provided with a cylinder hole, a communication hole and a locking hole; one end of the communicating hole is connected with the cylinder hole, and the other end of the communicating hole is communicated with the outside of the cylinder hole; the locking hole is communicated with the communicating hole, the auxiliary variable-capacitance device comprises an expansion spring and a valve core which are arranged in the locking hole, a sealing section and a communicating section are arranged on the valve core, the valve core is in sliding connection with the locking hole, a vent hole is formed in the valve plate, and one end of the locking hole is communicated with the inner cavity of the cylinder cover through the vent hole. The utility model provides a low voltage starts compressor can realize compressor under the prerequisite that does not change the motor design and start smoothly under the low voltage environment, and compressor normal operating condition's refrigerating capacity is not influenced, and entire system all is mechanical structure, reliable stable.
Description
Technical Field
The utility model belongs to the technical field of the compressor technology and specifically relates to a low-voltage starting compressor is related to.
Background
With the development of national economy, the living standard of people is gradually improved. The demand of the common people for the refrigerator is higher and higher. The compressor is used as a core component of a refrigerator and a freezer, is the key for improving the quality of various items of refrigeration appliances, and the key for designing the refrigerator is to find a proper compressor as a power source of a refrigerator refrigerant.
The refrigerator system is characterized in that the refrigerator starting difficulty is larger as the air temperature is higher, particularly a fixed-frequency compressor, when the ambient temperature is increased, the pressure of refrigerant in the refrigerator system is increased, the compressor is difficult to start, the exhaust pressure of the compressor is rapidly increased and the suction pressure is not reduced immediately in the starting stage, so that the starting load is far larger than the normal working state, and in the process, once the torque provided by a motor of the compressor is insufficient to overcome the torque required by cold gas of the compressor, the compressor fails to start. Once the compressor passes through the most difficult starting stage, the suction pressure is gradually reduced along with the establishment of the working condition of the refrigerator system, the load of the compressor is reduced, the refrigerator is gradually in a stable working stage, and the torque of the compressor is far less than the maximum torque of the starting stage when the refrigerator is stably operated. That is to say, the motor design of the compressor should leave a large margin for overcoming the short-time large torque in the starting stage, and the motor of the compressor works under a lower load in the stable operation stage, so that the performance of the motor is excessive.
The starting capacity of the compressor is closely related to the power supply voltage, and the lower the voltage, the smaller the torque that can be output by the motor, and the worse the corresponding starting capacity. Because the electric power guarantee levels in different countries and different regions are different, the voltage of the residential power grid is lower in some regions. As mentioned above, the starting load of the fixed-frequency compressor is large, and if the grid voltage is low, the starting failure of the compressor is easily caused. Therefore, it is necessary to design a compressor which can reduce the operation load in the starting stage to realize low-voltage starting and does not affect the refrigeration capacity in the normal operation stage after starting.
Chinese patent application publication No. CN102979695B, published as 2015, 09/02, entitled "a hermetic refrigeration compressor", discloses a hermetic refrigeration compressor, which includes a crankshaft and at least one cylinder disposed in the radial direction of the crankshaft and driven by the crankshaft, a connecting rod fixed to the piston is disposed on the piston of the cylinder, a speed-adjusting chute is disposed on the connecting rod, the length of the speed-adjusting chute in the transverse direction of the connecting rod is adapted to the rotating diameter of a crank on the crankshaft, and the crank on the crankshaft is slidably connected in the speed-adjusting chute. The problems of unbalanced work and high noise of the closed refrigeration compressor in the prior art are effectively solved. But the refrigeration compressor has not yet solved the above problems.
Disclosure of Invention
The utility model discloses an overcome the problem that compressor start-up stage start-up load is difficult to the start-up among the prior art, provide a low voltage and start refrigeration compressor, can realize the smooth start-up of refrigeration compressor under the low voltage environment under the prerequisite that does not change motor design, the refrigeration ability of compressor normal operating condition is not influenced, and entire system all is mechanical structure, reliable stable.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a low-voltage starting refrigeration compressor comprises a crankcase, a piston, a valve plate, a cylinder cover and an auxiliary variable-volume device, wherein the crankcase is provided with a cylinder hole, a communication hole and a locking hole; one end of the communication hole is communicated with the cylinder hole, and the other end of the communication hole is communicated with the outside of the cylinder hole; the locking hole is communicated with the communicating hole, the auxiliary variable volume device comprises an expansion spring and a valve core which are arranged in the locking hole, a sealing section and a communicating section are arranged on the valve core, the valve core is connected with the locking hole in a sliding mode, one end of the expansion spring is connected with the valve core, the other end of the expansion spring is connected with a crankcase, an air vent is arranged on the valve plate, and one end of the locking hole is communicated with an inner cavity of the cylinder cover through the air vent.
In the technical scheme, before the compressor is started, the exhaust pressure and the suction pressure in the cylinder cover are in a balanced state, no pressure difference exists between the left side and the right side of the valve core, the valve core presses the valve plate by the end face of the valve core under the action of the elastic force of the extension spring, the communication hole faces the opening position of the valve core at the moment, the communication hole is in the opening position, the inside and the outside of the cylinder hole are in a communication state, namely the compressor is in a small displacement state. When the compressor is started, when the piston runs from the bottom dead center to the position of the communication hole along the cylinder hole, compressed gas can be discharged out of the cylinder through the communication hole, and after the piston completely seals the communication hole, the gas in the cylinder hole can be completely compressed and enters the cylinder cover. Along with the compression process, the pressure in the cylinder cover is continuously increased, and the suction pressure in the shell is slowly reduced due to the large volume of the cavity. The compressor is started at the time of maximum load, and the process is much easier than the normal starting of the compressor because a part of gas is discharged out of the cylinder hole through the communication hole and the displacement of the compressor is reduced. After the compressor runs, the inner cavity of the cylinder cover is filled with high-pressure gas, the gas can slowly flow into the locking hole through the vent hole, the air pressure on the end face of the valve core is slowly increased, and the valve core is slowly pushed to move backwards. After the start-up phase, the pressure in the shell is continuously reduced with the increase of the compressor discharge gas, and the load of the compressor is reduced. And as the pressure of the end face of the valve core is gradually increased, the valve core completely closes the communication hole finally. The gas in the cylinder hole can not be discharged out of the cylinder hole through the communication hole, the displacement of the compressor is recovered to the maximum displacement state, and the compressor is started to enter a stable operation stage. In the starting process described above, the displacement is actively reduced in the starting stage of the compressor, the amount of compressed gas is reduced, the torque of the motor required for starting is smaller than that of a normal displacement compressor, and the starting success rate of the compressor is greatly improved in a low-voltage environment. The vent hole is provided with a smaller diameter or a throttling structure is added to reduce the gas flow, so that the valve core is controlled to delay closing of the communication hole; the suction side pressure of the compressor is greatly reduced, the communicating hole is closed after the load of the motor is reduced, the normal discharge capacity of the compressor is recovered, and the requirement of starting voltage is reduced on the premise of not influencing the refrigerating capacity of the compressor. And other active electric driving structures are not needed to be added in the control process, and automatic control is realized only by the air pressure difference of the inner cavity of the cylinder cover.
Preferably, a throttle member for controlling the flow rate of the vent hole is provided in the vent hole. The throttling element is in interference fit with the vent hole, the structure can realize the control of the flow of the vent hole by replacing the throttling element, and meanwhile, the processing cost can be reduced.
Preferably, the throttling element is of a cylindrical structure, and a small hole is formed in the center of the throttling element. The structure can realize the throttling effect of the throttling element.
Preferably, the throttling element is of a cylindrical structure, and a vent groove is formed in the side wall of the throttling element. The structure can realize the throttling effect of the throttling element.
Preferably, the throttling element comprises two throttling parts with the same structure, the two throttling parts are tightly attached in the axial direction, the throttling part is of a cylindrical structure, and a part of the throttling part is cut off in the axial direction to form a fan-shaped vent groove. The structure controls the gas circulation speed by adjusting the staggered angle of the two box ventilation grooves, and the control mode is simple.
Preferably, the communicating section is in a ring-shaped groove structure.
Preferably, one end of the locking hole, which is far away from the cylinder cover, is provided with a balance hole, and the locking hole is communicated with the outside through the balance hole. The structure can balance the air pressure at the other end of the locking hole, and is convenient to control.
Preferably, a throttling piece is arranged in the balance hole. By the structure, the delay time of the valve core can be further controlled.
Preferably, a sealing ring groove is arranged on the sealing section, and a sealing ring is arranged in the sealing ring groove. The structure can increase the sealing effect.
Preferably, the diameter of the communication hole is larger than the diameter of the locking hole. The structure can ensure that the valve core in the locking hole can completely seal the communicating hole.
Preferably, the locking hole is internally provided with an adjusting seat, the adjusting seat is in threaded connection with the locking hole, and one end of the telescopic spring is connected with the crankcase through the adjusting seat. The structure can adjust the position of the adjusting seat according to the requirement, further adjust the precompression amount of the telescopic spring and control the pressure difference required by opening and closing the valve core.
The utility model has the advantages that: (1) the refrigeration compressor can be smoothly started under a low-voltage environment on the premise of not changing the design of the motor, the refrigeration capacity of the compressor in a normal running state is not affected, and the whole system is of a mechanical structure and is reliable and stable; (2) the time for the valve core to start moving can be controlled by changing the throttling capacity by selecting different throttling elements, so that different starting requirements can be met; (3) the starting capability can be improved to different degrees by changing the communication position of the air cylinder; (4) the pressure difference of the valve core opening and closing can be controlled by adjusting the rigidity of the spring or adjusting the position of the adjusting seat.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 2;
FIG. 3 is a schematic structural view of a throttle member in embodiment 2;
FIG. 4 is a schematic structural view of a throttle member in embodiment 3;
FIG. 5 is a schematic structural view of a throttle member in embodiment 4;
FIG. 6 is a schematic structural view of example 5.
In the figure: the hydraulic cylinder comprises a crankcase 1, a cylinder hole 1.1, a communicating hole 1.2, a locking hole 1.3, a balance hole 1.4, a piston 2, a valve plate 3, a vent hole 3.1, a cylinder cover 4, an auxiliary variable volume device 5, a telescopic spring 5.1, a valve core 5.2, a sealing section 5.2.1, a communicating section 5.2.2, a sealing ring groove 5.2.3, a throttling element 5.3, a small hole 5.3.1, a vent groove 5.3.2, a throttling component 5.3.3 and an adjusting seat 5.4.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific embodiments.
Example 1:
as shown in fig. 1 and fig. 2, a low-voltage start refrigeration compressor comprises a crankcase 1, a piston 2, a valve plate 3, a cylinder cover 4 and an auxiliary variable-volume device 5, wherein the crankcase 1 is provided with a cylinder hole 1.1, a communication hole 1.2 and a locking hole 1.3, the diameter of the communication hole 1.2 is larger than that of the locking hole 1.3, the piston 2 is arranged in the cylinder hole 1.1, and the communication hole 1.2 is positioned between a lower dead point and an upper dead point of the piston 2; one end of the communicating hole 1.2 is communicated with the cylinder hole 1.1, and the other end is communicated with the outside of the cylinder hole 1.1; locking hole 1.3 and intercommunicating pore 1.2 intercommunication, supplementary varactor 5 is including setting up expanding spring 5.1 and case 5.2 in locking hole 1.3, be equipped with seal section 5.2.1 and intercommunication section 5.2.2 on case 5.2, case 5.2 and locking hole 1.3 sliding connection, expanding spring 5.1's one end is connected with case 5.2, expanding spring 5.1's the other end is connected with crankcase 1, be equipped with air vent 3.1 on the valve plate 3, the one end of locking hole 1.3 is passed through air vent 3.1 and is communicate with the inner chamber of cylinder head 4. And a throttling element 5.3 for controlling the flow of the vent hole 3.1 is arranged in the vent hole 3.1. The communicating section 5.2.2 is in a ring-shaped groove structure. One end of the locking hole 1.3, which is far away from the cylinder cover 4, is provided with a balance hole 1.4, and the locking hole 1.3 is communicated with the outside through the balance hole 1.4. The sealing section 5.2.1 is provided with a sealing ring groove 5.2.3, and a sealing ring is arranged in the sealing ring groove 5.2.3.
In the technical scheme, before the compressor is started, the exhaust pressure and the suction pressure in the cylinder cover 4 are in a balanced state, the left side and the right side of the valve core 5.2 have no pressure difference, the valve core 5.2 presses the valve plate 3 by the end face of the valve core 5.2 under the action of the elastic force of the extension spring 5.1, at the moment, the communication hole 1.2 is opposite to the opening position of the valve core 5.2, the communication hole 1.2 is in the opening position, the inside and the outside of the cylinder hole 1.1 are in a communication state, namely, the compressor is in a small displacement state. When the compressor is started, when the piston 2 runs from the bottom dead center to the position of the communication hole 1.2 along the cylinder hole 1.1, the compressed gas is discharged out of the cylinder through the communication hole 1.2, and when the piston 2 completely seals the communication hole 1.2, the gas in the cylinder hole 1.1 can be completely compressed and enters the cylinder cover 4. As the compression process proceeds, the pressure in the cylinder head 4 increases continuously, and the suction pressure decreases more slowly due to the large volume of the cavity in the shell. The compressor is started at the time of maximum load, and the process is much easier than the normal starting of the compressor because a part of gas is discharged out of the cylinder hole 1.1 through the communication hole 1.2 and the displacement of the compressor is reduced. After the compressor is operated, the inner cavity of the cylinder cover 4 is filled with high-pressure gas, the gas can slowly flow into the locking hole 1.3 through the vent hole 3.1, the air pressure on the end face of the valve core 5.2 is slowly increased, and the valve core 5.2 is slowly pushed to move backwards. After the start-up phase, the pressure in the shell is continuously reduced with the increase of the compressor discharge gas, and the load of the compressor is reduced. As the pressure on the end face of the valve core 5.2 increases gradually, the valve core 5.2 closes the communication hole 1.2 completely. The gas in the cylinder hole 1.1 can not be discharged out of the cylinder hole 1.1 through the communication hole 1.2, the displacement of the compressor is recovered to the maximum displacement state, and the compressor is started to enter a stable operation stage. In the starting process described above, the displacement is actively reduced in the starting stage of the compressor, the amount of compressed gas is reduced, the torque of the motor required for starting is smaller than that of a normal displacement compressor, and the starting success rate of the compressor is greatly improved in a low-voltage environment. The vent hole 3.1 is set with a smaller diameter or a throttling structure is added to reduce the gas flow, so that the valve core 5.2 is controlled to delay closing of the communicating hole 1.2; the suction side pressure of the compressor is greatly reduced, the communicating hole 1.2 is closed after the load of the motor is reduced, the normal discharge capacity of the compressor is recovered, and the requirement of starting voltage is reduced on the premise of not influencing the refrigerating capacity of the compressor. And other active electric driving structures are not needed to be added in the control process, and the automatic control is realized only by the air pressure difference of the inner cavity of the cylinder cover 4.
Example 2:
as shown in fig. 3, based on embodiment 1, the throttling element 5.3 is a cylindrical structure, and a small hole 5.3.1 is formed in the center of the throttling element 5.3. Said construction makes it possible to achieve a throttling effect of the throttling element 5.3.
Example 3:
as shown in fig. 4, based on embodiment 1, the throttle 5.3 is a cylindrical structure, and a vent groove 5.3.2 is provided on the sidewall of the throttle 5.3. Said construction makes it possible to achieve a throttling effect of the throttling element 5.3.
Example 4:
as shown in fig. 5, based on embodiment 1, the throttling element 5.3 includes two throttling components 5.3.3 with the same structure, the two throttling components 5.3.3 are axially and tightly attached, the throttling component 5.3.3 is a cylindrical structure, and a part of the throttling component 5.3.3 is cut off along the axial direction to form a fan-shaped vent groove 5.3.2. The structure controls the gas circulation speed by adjusting the staggered angle of the two box ventilation grooves 5.3.2, and the control mode is simple. A throttling element 5.3 is arranged in the balance hole 1.4.
Example 3:
as shown in fig. 6, on the basis of embodiment 1, an adjusting seat 5.4 is arranged in the locking hole 1.3, the adjusting seat 5.4 is in threaded connection with the locking hole 1.3, and one end of a telescopic spring 5.1 is connected with the crankcase 1 through the adjusting seat 5.4. The structure can adjust the position of the adjusting seat 5.4 according to requirements, further adjust the precompression amount of the telescopic spring 5.1 and control the required pressure difference of the opening and closing of the valve core 5.2.
The utility model has the advantages that: (1) the refrigeration compressor can be smoothly started under a low-voltage environment on the premise of not changing the design of the motor, the refrigeration capacity of the compressor in a normal running state is not affected, and the whole system is of a mechanical structure and is reliable and stable; (2) the time for starting the movement of the valve core 5.2 can be controlled by selecting different throttling elements 5.3, so that different starting requirements can be met; (3) the starting capability can be improved to different degrees by changing the communication position of the air cylinder; (4) the pressure difference of the valve core 5.2 opening and closing can be controlled by adjusting the rigidity of the spring or adjusting the position of the adjusting seat 5.4.
Claims (10)
1. A low-voltage starting refrigeration compressor is characterized by comprising a crankcase, a piston, a valve plate, a cylinder cover and an auxiliary variable-volume device, wherein the crankcase is provided with a cylinder hole, a communication hole and a locking hole; one end of the communication hole is communicated with the cylinder hole, and the other end of the communication hole is communicated with the outside of the cylinder hole; the locking hole is communicated with the communicating hole, the auxiliary variable volume device comprises an expansion spring and a valve core which are arranged in the locking hole, a sealing section and a communicating section are arranged on the valve core, the valve core is connected with the locking hole in a sliding mode, one end of the expansion spring is connected with the valve core, the other end of the expansion spring is connected with a crankcase, an air vent is arranged on the valve plate, and one end of the locking hole is communicated with an inner cavity of the cylinder cover through the air vent.
2. A low-voltage start-up refrigeration compressor according to claim 1, wherein said vent hole is provided with a throttle member for controlling a flow rate of the vent hole.
3. A low-voltage start-up refrigeration compressor according to claim 2, wherein said throttle member is of a cylindrical structure, and a small hole is provided in the center of the throttle member.
4. The low-voltage starting refrigeration compressor as claimed in claim 2, wherein the throttle member is of a cylindrical structure, and a vent groove is formed in a side wall of the throttle member.
5. A low-voltage start-up refrigeration compressor according to claim 1, 2, 3 or 4, wherein said communicating section is of an annular groove configuration.
6. A low-voltage start-up refrigerant compressor according to claim 1, 2, 3 or 4, wherein the end of the locking hole remote from the cylinder head is provided with a balance hole through which the locking hole communicates with the outside.
7. A low-voltage start-up refrigeration compressor according to claim 6, wherein a throttle member is provided in said balance hole.
8. A low-voltage start-up refrigeration compressor according to claim 1, 2, 3 or 4, wherein said sealing section is provided with a sealing ring groove, and a sealing ring is arranged in the sealing ring groove.
9. A low-voltage starting refrigerant compressor according to claim 1, 2, 3 or 4, wherein the diameter of said communication hole is larger than the diameter of said locking hole.
10. A low-voltage start-up refrigeration compressor according to claim 1, 2, 3 or 4, wherein an adjusting seat is arranged in the locking hole, the adjusting seat is in threaded connection with the locking hole, and one end of the expansion spring is connected with the crankcase through the adjusting seat.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120453768.XU CN215256693U (en) | 2021-03-02 | 2021-03-02 | Low-voltage starting refrigeration compressor |
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| CN202120453768.XU CN215256693U (en) | 2021-03-02 | 2021-03-02 | Low-voltage starting refrigeration compressor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113027730A (en) * | 2021-03-02 | 2021-06-25 | 加西贝拉压缩机有限公司 | Low-voltage starting refrigeration compressor |
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- 2021-03-02 CN CN202120453768.XU patent/CN215256693U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113027730A (en) * | 2021-03-02 | 2021-06-25 | 加西贝拉压缩机有限公司 | Low-voltage starting refrigeration compressor |
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