Pump body assembly, rotary fluid compression device

Abstract

The present invention provides a pump body assembly and a rotary fluid compression device. The pump body assembly includes a cylinder and rollers located in the cylinder cavity of the cylinder. An exhaust cutout and a sliding vane groove are formed on the cylinder wall of the cylinder. A sliding vane is arranged in the sliding vane groove. The pump body assembly has a resonance silencing cavity, and the resonance silencing cavity has a drainage channel. The inlet of the drainage channel can communicate with a target compression space corresponding to the cylinder between the exhaust cutout and the sliding vane groove. According to the present invention, on the one hand, it can reduce the compression pneumatic noise generated by the change in the compression chamber pressure and pressure pulsation caused by the continuous change in the volume of the pump body compression chamber during the periodic suction, compression, and exhaust processes of the rotary compressor, thereby optimizing the noise and vibration of the compressor. On the other hand, after the exhaust is completed, the high-pressure chamber and the low-pressure chamber can be connected through the drainage channel to achieve the reflux effect of the compressed fluid, effectively alleviating the overpressure problem at the end of the exhaust stage.

Description

Technical Field

[0001] The present invention belongs to the technical field of compressor manufacturing, and particularly relates to a pump body assembly and a rotary fluid compression device. Background Art

[0002] The pump body assembly of a rolling rotor compressor is composed of a cylinder, a roller, a crankshaft, upper and lower flange assemblies (including upper and lower flanges, an exhaust valve plate and a valve plate limit baffle), and a sliding vane. By the mutual cooperation of each pump body part, a sealed high-pressure chamber (exhaust chamber) and a low-pressure chamber (suction chamber) are formed. The sliding vane is in clearance fit with the sliding vane groove and reciprocates in the sliding vane groove, so that the volumes of the high-pressure and low-pressure chambers change periodically. An exhaust crescent groove inclined cut is formed at a position of the cylinder compression chamber close to the sliding vane groove. A circular hole-shaped exhaust port is provided at a position corresponding to the exhaust inclined cut of the cylinder on the upper flange. An exhaust valve plate and a valve plate limit baffle connected to a valve seat by a tail rivet are designed on the flange exhaust port. During the gas compression process in the compression chamber, the exhaust valve plate is closely attached to the flange exhaust port to achieve the sealing of the compression chamber. When the volume of the compression chamber decreases to a certain extent and the gas pressure in the compression chamber reaches or exceeds the back pressure of the valve plate, the valve plate opens, and the gas in the compression chamber is discharged out of the pump body through the exhaust inclined cut of the cylinder and the flange exhaust port, realizing the periodic suction, compression, and exhaust processes of the compressor.

[0003] The pneumatic noise generated due to the periodic suction, compression, and exhaust of the compressor is one of the main noise sources of the compressor. Reducing the pneumatic noise to meet the development demand of low-noise rotary compressors is one of the difficult problems that need to be focused on in the current research and development process of compressor products. In the prior art, corresponding noise reduction structures are mostly designed for the noise and vibration during the exhaust of the compressor, while the compression pneumatic noise generated due to the pressure change and pressure pulsation caused by the continuous reduction of the compression chamber volume during the compression of the gas (refrigerant) in the compressor has not been taken seriously and solved. Summary of the Invention

[0004] Therefore, the present invention provides a pump body assembly and a rotary fluid compression device, which can overcome the deficiency that the compression pneumatic noise generated due to the pressure change and pressure pulsation caused by the continuous reduction of the compression chamber volume in the related art has not been effectively reduced.

[0005] To solve the above problems, the present invention provides a pump body assembly, including a cylinder and a roller in the cylinder cavity of the cylinder. An exhaust cut and a sliding vane groove are formed on the cylinder wall of the cylinder. A sliding vane is arranged in the sliding vane groove. The pump body assembly has a resonance sound absorption chamber, and the resonance sound absorption chamber has a drainage channel. The inlet of the drainage channel can communicate with a target compression space, and the target compression space is the compression space corresponding to the cylinder between the exhaust cut and the sliding vane groove.

[0006] Preferably, a plane perpendicular to the axis of the cylinder is the first plane. The cylinder is projected onto the first plane. The drainage channel has a first side wall away from the sliding vane and a second side wall close to the sliding vane. The first side wall is within the projection range of the exhaust cut, and the second side wall is on the projection of the cylinder between the exhaust cut and the sliding vane groove.

[0007] Preferably, the pump body assembly further includes a flange stacked with the cylinder. A first opening groove is formed on one end face of the cylinder, and the first opening groove and the flange together form the resonance silencing cavity; alternatively, a second opening groove is formed on the end face of the flange matching the cylinder, and the second opening groove and the end face of the cylinder together form the resonance silencing cavity; alternatively, a first opening groove is formed on one end face of the cylinder, and a second opening groove is formed in the area of the flange corresponding to the first opening groove, and the first opening groove and the second opening groove together form the resonance silencing cavity.

[0008] Preferably, the flange is one of the upper flange or the lower flange.

[0009] Preferably, the drainage channel is formed in the cylinder.

[0010] Preferably, the drainage channel includes a first drainage section and a second drainage section. The first drainage section extends along the radial direction of the cylinder and is communicated with the compression space, and the second drainage section extends along the axial direction of the cylinder and is communicated with the resonance silencing cavity.

[0011] Preferably, the cross-sectional diameter of the first drainage section is d and the length is L1, the cross-sectional diameter of the second drainage section is d and the length is L2. The axial cross-section of the resonance silencing cavity is circular, with a diameter of D and an axial depth along the cylinder of H. The sound speed corresponding to the fluid drained by the drainage channel is c.

[0012]

[0013] Preferably, the cross-sections of the first drainage section and the second drainage section are both rectangular, with a length of a and a width of b. The equivalent diameter of the rectangle is s, s = 2ab / (a + b). The length of the first drainage section is L1, the length of the second drainage section is L2. The axial cross-section of the resonance silencing cavity is circular, with a diameter of D and an axial depth along the cylinder of H. The sound speed corresponding to the fluid drained by the drainage channel is c.

[0014]

[0015] Preferably, the drainage channel extends in a straight line.

[0016] The present invention further provides a rolling rotor compressor, including the above-mentioned pump body assembly.

[0017] On the one hand, for a pump body assembly and a rotary fluid compression device provided by the present invention, the resonance silencing cavity communicates with the compression space and the exhaust cavity through the drainage channel, so as to reduce the compression pneumatic noise generated by the change of the compression cavity pressure and the pressure pulsation caused by the continuous change of the volume of the pump body compression cavity during the periodic suction, compression, and exhaust processes of the rotor compressor, thereby optimizing the noise and vibration of the compressor. On the other hand, after the exhaust is completed, the high-pressure cavity and the low-pressure cavity can be connected through the induction channel to achieve the reflux effect of the compressed fluid, effectively alleviating the overpressure problem at the end of the exhaust stage. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the axial cross-section structure of the pump body assembly according to an embodiment of the present invention;

[0019] Figure 2 It is Figure 1 The partial enlarged view at A in

[0020] Figure 3 It is Figure 1 The schematic diagram of the projection of the cylinder in on the first plane;

[0021] Figure 4 It is Figure 3 The partial enlarged view at B in ;

[0022] Figure 5 It is Figure 4 The cross-sectional view in the A-A direction in ;

[0023] Figure 6 It is Figure 3 The partial enlarged view at C in ;

[0024] Figure 7 It is the partial enlarged view of the cylinder in the pump body assembly according to an embodiment of the present invention;

[0025] Figure 8 It is the partial cross-sectional enlarged view of the pump body assembly according to an embodiment of the present invention;

[0026] Figure 9 It is a schematic diagram of the axial cross-section structure of the pump body assembly according to an embodiment of the present invention;

[0027] Figure 10 It is the partial enlarged view of the pump body assembly according to an embodiment of the present invention;

[0028] Figure 11 It is the partial enlarged view of the pump body assembly according to an embodiment of the present invention.

[0029] The reference numerals are shown as:

[0030] 1. Cylinder; 11. Exhaust cut; 12. Vane groove; 13. Suction port; 2. Roller; 4. Resonance silencing cavity; 41. Drainage channel; 411. First side wall; 412. Second side wall; 413. First drainage section; 414. Second drainage section; 42. First opening groove; 43. Second opening groove; 51. Upper flange; 52. Lower flange; 53. Exhaust port; 54. Exhaust valve plate; 6. Crankshaft. Detailed implementation mode

[0031] Refer to Figures 1 to 11 As shown in the figure, according to an embodiment of the present invention, a pump body assembly is provided, including a cylinder 1 and a roller 2 located in the cylinder cavity of the cylinder 1. The roller 2 is sleeved on the eccentric part of the crankshaft 6. An exhaust cut 11 and a vane groove 12 are formed on the cylinder wall of the cylinder 1. A vane (not shown and not indexed in the figure) is arranged in the vane groove 12. Driven by the rotation of the crankshaft 6, the contact line between the roller 2 and the cylinder wall of the cylinder 1 and the vane divide the cylinder cavity into a relatively independent suction cavity (low-pressure cavity) and an exhaust cavity (i.e., high-pressure cavity). The suction port 13 and the exhaust port 53 of the pump body assembly are respectively arranged corresponding to the suction cavity and the exhaust cavity, that is, on the opposite sides of the vane respectively. The pump body assembly has a resonance silencing cavity 4, and the resonance silencing cavity 4 has a drainage channel 41. The inlet of the drainage channel 41 can communicate with a target compression space, and the target compression space is the compression space corresponding to the cylinder 1 between the exhaust cut 11 and the vane groove 12. It should be noted that the compression space corresponding to the cylinder 1 between the exhaust cut 11 and the vane groove 12 specifically refers to Figure 3In the shown orientation, a small-volume exhaust cavity is formed jointly by the cylinder wall of the cylinder 1 between the groove wall of the sliding vane groove 12 close to one side of the exhaust cut 11 and the cut edge of the exhaust cut 11 close to the sliding vane groove 12 and the roller 2. It can be understood that at this time, the high-pressure exhaust of the pump body assembly has ended, the contact line between the roller 2 and the cylinder wall of the cylinder 1 has passed the position of the exhaust port 53, and the exhaust valve plate 54 is in a closed state. Without the diversion channel 41 provided, the fluid (refrigerant) in this compression space will be over-compressed, which will obviously bring pulsation noise of the compressor. In this technical solution, on the one hand, the resonance silencing cavity 4 is always communicated with the compression space and the exhaust cavity through the diversion channel 41, so as to reduce the compression pneumatic noise generated by the change of the compression cavity pressure and pressure pulsation caused by the continuous change of the volume of the pump body compression cavity (i.e., the high-pressure cavity) during the periodic suction, compression, and exhaust processes of the rotary compressor, thereby optimizing the noise and vibration of the compressor; on the other hand, it can connect the high-pressure cavity and the low-pressure cavity through the diversion channel 41 after the exhaust ends, realizing the reflux effect of the compressed fluid and effectively relieving the overpressure problem in the exhaust end stage. It should be noted that the gas in the resonance silencing cavity 4 has a certain natural frequency. During the rotation and compression of the compressor, when the sound wave frequency in the compression cavity is close to or the same as the natural frequency of the gas in the resonance silencing cavity 4, resonance occurs, thereby greatly reducing the sound energy and achieving the silencing effect.

[0032] Specifically, the plane perpendicular to the axis of the cylinder 1 is the first plane, and the cylinder 1 is projected on the first plane. The diversion channel 41 has a first side wall 411 far from the sliding vane and a second side wall 412 close to the sliding vane. The first side wall 411 is within the projection range of the exhaust cut 11 (specifically, for example, Figure 6 the position shown by point E in Figure 6 ), and the second side wall 412 is on the projection of the cylinder 1 between the exhaust cut 11 and the sliding vane groove 12 (specifically, for example, the position shown by point N in ). Preferably, the end of the second side wall 412 (the end close to the compression cavity) is at the intersection of the groove wall of the sliding vane groove 12 close to the compression cavity side and the inner wall of the cylinder cavity of the cylinder 1, so that the resonance silencing cavity 4 can always be communicated with the compression cavity, and the reliability risk of the compressor with excessive torque fluctuation caused by overpressure, oil pressure, or poor exhaust during the exhaust end stage of the pump body assembly is reduced to the greatest extent.

[0033] In some embodiments, the resonance silencing cavity 4 can be formed in various ways. Specifically, for example, the pump body assembly further includes a flange, which is one of the upper flange 51 or the lower flange 52. The flange is stacked with the cylinder 1. A first opening groove 42 is formed on one end face of the cylinder 1. The first opening groove 42 and the flange together form the resonance silencing cavity 4, as Figure 2 shown; or, a second opening groove 43 is formed on the end face of the flange that matches the cylinder 1. The second opening groove 43 and the end face of the cylinder 1 together form the resonance silencing cavity 4, as Figure 10 shown; or, a first opening groove 42 is formed on one end face of the cylinder 1, and a second opening groove 43 is formed in the area of the flange corresponding to the first opening groove 42. The first opening groove 42 and the second opening groove 43 together form the resonance silencing cavity 4, as Figure 11 shown.

[0034] The drainage channel 41 can be designed as a separate pipeline, but this separate pipeline design has a relatively complex structure. Preferably, the drainage channel 41 is formed in the cylinder 1.

[0035] In one embodiment, the drainage channel 41 includes a first drainage section 413 and a second drainage section 414. The first drainage section 413 extends along the radial direction of the cylinder 1, and the first drainage section 413 communicates with the compression space. The second drainage section 414 extends along the axial direction of the cylinder 1 and the second drainage section 414 communicates with the resonance silencing cavity 4, so as to optimize the flow direction of the drainage channel 41 and make the pump body structure design more reasonable.

[0036] The cross-sectional diameter of the first drainage section 413 is d and the length is L1. The cross-sectional diameter of the second drainage section 414 is d and the length is L2. The axial cross-section of the resonance silencing cavity 4 is circular, and its diameter is D and the axial depth along the cylinder 1 is H. The sound speed corresponding to the fluid drained by the drainage channel 41 (specifically the refrigerant used in the application) is c. After experimental verification by the inventor, when the following conditions are met:

[0037] When it is [a certain situation], it can effectively reduce the noise peak in the frequency range of 1 kHz to 5 kHz, especially having a good noise elimination effect on compressed high-frequency pneumatic noise; based on the same principle, when the cross-sections of the first drainage section 413 and the second drainage section 414 are both rectangular, the length of the rectangle is a, the width is b, the equivalent diameter of the rectangle is s, s = 2ab / (a + b), the length of the first drainage section 413 is L1, the length of the second drainage section 414 is L2, the axial section of the resonance muffler chamber 4 is circular, and its diameter is D and the axial depth along the cylinder 1 is H, and the sound speed corresponding to the fluid drained by the drainage channel 41 is c,

[0038]

[0039] In another embodiment, as Figure 8 shown, the drainage channel 41 extends along a straight line. On the one hand, it makes the processing technology simpler. On the other hand, it can shorten the channel length, thereby realizing the adjustment of the noise reduction frequency band.

[0040] It should be noted that the unit of the structural dimension parameters such as H, D, s, d, L1, L2, etc. in the text can be mm, and the unit of c is m / s.

[0041] According to an embodiment of the present invention, there is also provided a rotary fluid compression device, including the above-mentioned pump body assembly. The rotary fluid compression device is, for example, a rolling rotor compressor, a sliding vane compressor, or a sliding vane expander.

[0042] Those skilled in the art can easily understand that, on the premise of no conflict, the above-mentioned advantageous ways can be freely combined and superimposed.

[0043] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A pump body assembly, comprising a cylinder (1) and a roller (2) located in the cylinder cavity of the cylinder (1). An exhaust cutout (11) and a sliding vane groove (12) are formed on the cylinder wall of the cylinder (1). A sliding vane is arranged in the sliding vane groove (12), and it is characterized in that, The pump body assembly has a resonance silencing cavity (4), the resonance silencing cavity (4) has a drainage channel (41), an inlet of the drainage channel (41) can communicate with a target compression space, and the target compression space is a compression space corresponding to a cylinder (1) between the exhaust cut (11) and the sliding vane groove (12); A plane perpendicular to the axis of the cylinder (1) is a first plane, the cylinder (1) projects onto the first plane, the drainage channel (41) has a first side wall (411) away from the sliding vane and a second side wall (412) close to the sliding vane, the first side wall (411) is within the projection range of the exhaust cut (11), and the second side wall (412) is on the projection of the cylinder (1) between the exhaust cut (11) and the sliding vane groove (12); the drainage channel (41) is constructed within the cylinder (1); the drainage channel (41) includes a first drainage section (413) and a second drainage section (414), wherein the first drainage section (413) extends along the radial direction of the cylinder (1), and the first drainage section (413) communicates with the compression space, and the second drainage section (414) extends along the axial direction of the cylinder (1) and the second drainage section (414) communicates with the resonance silencing cavity (4).

2. The pump body assembly according to claim 1, characterized in that, The pump body assembly further includes a flange, which is stacked with the cylinder (1), a first opening groove (42) is constructed on one end surface of the cylinder (1), and the first opening groove (42) and the flange together form the resonance silencing cavity (4); alternatively, a second opening groove (43) is constructed on an end surface of the flange that matches the cylinder (1), and the second opening groove (43) and the end surface of the cylinder (1) together form the resonance silencing cavity (4); alternatively, a first opening groove (42) is constructed on one end surface of the cylinder (1), a second opening groove (43) is constructed in a region of the flange corresponding to the first opening groove (42), and the first opening groove (42) and the second opening groove (43) together form the resonance silencing cavity (4).

3. The pump body assembly according to claim 2, wherein, The flange is one of an upper flange (51) or a lower flange (52).

4. A rotary fluid compression device, comprising a pump body assembly, characterized in that, The pump body assembly is the pump body assembly according to any one of claims 1 to 3.

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