WO2020177507A1

WO2020177507A1 - Pump body assembly for reciprocating-type compressor, and reciprocating-type compressor

Info

Publication number: WO2020177507A1
Application number: PCT/CN2020/074727
Authority: WO
Inventors: 陈新杰; 黄刚
Original assignee: 安徽美芝制冷设备有限公司
Priority date: 2019-03-01
Filing date: 2020-02-11
Publication date: 2020-09-10

Abstract

Disclosed are a pump body assembly (100) for a reciprocating-type compressor, and a reciprocating-type compressor (200) with the pump body assembly (100). The pump body assembly (100) comprises a crankcase (1), a piston (2), a crankshaft (3), and a connection rod (4), wherein a first end (41) of the connection rod (4) defines a first hole (411), and a second end (42) thereof defines a second hole (421); the crankcase (1) is provided with a first plane (10), and the first plane (10) passes through the central axis (120a) of an air cylinder bore, and is perpendicular to the central axis (110a) of a crankshaft hole; the connection rod (4) is provided with a second plane (40), and the second plane (40) passes through the center of the first hole (411) and the center of the second hole (421), and is perpendicular to both the central axis of the first hole (411) and the central axis of the second hole (421); and the first plane (10) and the second plane (40) are parallel to each other or overlap each other. The pump body assembly (100) has a stable structure, and can be run in a reliable manner.

Description

Pump body assembly for reciprocating compressor and reciprocating compressor

Cross references to related applications

This application is based on the Chinese patent application with the application number 201910154607.8 and the application date on March 1, 2019, and the Chinese patent application with the application number 201920268104.9 and the application date on March 1, 2019, and the priority of the above-mentioned Chinese patent application is requested Right, the entire content of the aforementioned Chinese patent application is hereby incorporated into this application as a reference.

Technical field

This application relates to the technical field of compressors, in particular to a pump body assembly and a reciprocating compressor for a reciprocating compressor.

Background technique

Reciprocating compressors usually include mechanical components and electrical drive components. The mechanical components generally use a reciprocating crank-connecting rod mechanism and include crankshafts, connecting rods, crankcases, pistons, cylinders, and valve blocks. Electrical drive components include stators and rotors. When the reciprocating compressor is running, the rotor drives the crankshaft to rotate, and the connecting rod drives the piston to reciprocate in the cylinder, thereby driving the valve block to complete the processes of suction, compression and exhaust.

In the related art, the pump body assembly of the reciprocating compressor will be greatly deformed during installation and operation, thereby affecting the reliability and stability of the reciprocating compressor.

Summary of the invention

This application aims to solve at least one of the technical problems existing in related technologies.

For this reason, this application proposes a pump body assembly for a reciprocating compressor, which has a stable structure and reliable operation.

The application also proposes a reciprocating compressor with the above-mentioned pump body assembly.

A pump body assembly for a reciprocating compressor according to an embodiment of the first aspect of the present application includes: a crankcase, the crankcase includes a body portion and a cylinder portion, and a crankshaft with an axis extending vertically is formed on the body portion A hole, the cylinder portion is provided on the top of the body portion and defines a cylinder hole with an axis extending in a transverse direction; a piston, the piston is provided in the cylinder hole and the piston is bored with an axis extending vertically A crankshaft, the crankshaft includes a main shaft portion and a counter shaft portion, the main shaft portion penetrates the crankshaft hole, the counter shaft portion is connected to the upper end of the main shaft portion, and the counter shaft portion The main shaft portion is parallel, and the auxiliary shaft portion is located above the main body portion; a connecting rod is provided above the main body portion and includes a first end and a second end, the first The end portion defines a first hole sleeved outside the piston pin, and the second end portion defines a second hole sleeved outside the secondary shaft portion, wherein the crankcase has a first plane, The first plane passes through the center axis of the cylinder hole and is perpendicular to the center axis of the crankshaft hole, the connecting rod has a second plane, and the second plane passes through the center of the first hole and the first plane. The centers of the two holes are perpendicular to the central axis of the first hole and the central axis of the second hole, and the first plane is parallel to or coincides with the second plane.

According to the pump body assembly for the reciprocating compressor of the embodiment of the present application, the first plane of the crankcase and the second plane of the connecting rod are set to be parallel or coincident, and the distance between the first plane and the second plane is less than It is equal to 1mm, which makes the pump body components fit closely and effectively improves the structural stability and use reliability of the pump body components during assembly and operation.

According to some embodiments of the present application, the body part includes a first part and a second part located on both sides of the diameter of the crankshaft hole, the cylinder part is provided on the top of the first part, and the The bottom has two first stator mounting feet, and the bottom of the second part has a second stator mounting foot.

According to some embodiments of the present application, when the first plane and the second plane are parallel, the distance between the first plane and the second plane is less than or equal to 1 mm.

According to some embodiments of the present application, projected along the axis of the crankshaft hole, the line L1 between the two first stator mounting feet is perpendicular to the line L2 between the second stator mounting foot and the crankshaft hole .

According to some embodiments of the present application, along the axis of the crankshaft hole, the line connecting one of the first stator mounting feet and the crankshaft hole is L3, and the other of the first stator mounting feet and The connecting line of the crankshaft hole is L4, and the angle between the L3 and the L4 is an acute angle or a right angle.

According to some embodiments of the present application, a first oil storage cavity with an open bottom is formed in the main shaft portion, a first oil groove is formed on the outer peripheral wall of the main shaft portion, and a first oil reservoir is formed on the main shaft portion. The first oil hole communicated with the oil cavity and the air bubble hole, the first oil hole penetrates outward to communicate with the first oil groove, and the bubble hole penetrates outward to the outer peripheral wall of the main shaft portion and is connected to the first oil groove. An oil groove is spaced apart.

According to some embodiments of the present application, a second oil storage cavity is formed in the auxiliary shaft portion, a communication passage connecting the first oil storage cavity and the second oil storage cavity is formed in the crankshaft, and the auxiliary shaft A second oil hole communicating with the second oil storage cavity is formed on the shaft portion, and the second oil hole penetrates outward to the outer peripheral wall of the secondary shaft portion.

According to some embodiments of the present application, a second oil groove is formed on the outer peripheral wall of the secondary shaft portion, and the second oil groove is in communication with the second oil hole.

According to some embodiments of the present application, the diameter of the main shaft portion is D1, and the diameter of the secondary shaft portion is d1, which satisfies: 1.1≤D1/d1≤1.5.

According to some embodiments of the present application, the diameter of the first hole is d2 and the diameter of the second hole is D2, which satisfies: 1.5≤D2/d2≤2.5.

According to some embodiments of the present application, the height h of the first end is the axial length of the first hole, and a matching groove for receiving the first end is formed on the piston, and the matching groove The height in the axial direction of the piston pin is H, where h<H, and the fitting gap y between the first end and the fitting groove satisfies: 0.2mm≤y≤0.6mm.

The reciprocating compressor according to the embodiment of the second aspect of the present application includes the pump body assembly for the reciprocating compressor according to the embodiment of the first aspect of the present application.

According to the reciprocating compressor of the embodiment of the present application, the structural stability and reliability of the reciprocating compressor during assembly and operation are improved by using the above-mentioned pump body assembly.

The additional aspects and advantages of the present application will be partially given in the following description, and some will become obvious from the following description, or be understood through the practice of the present application.

Description of the drawings

The above and/or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

Fig. 1 is a partial structural diagram of a reciprocating compressor according to an embodiment of the present application;

Fig. 2 is another partial structural diagram of the reciprocating compressor shown in Fig. 1;

Fig. 3 is a schematic structural diagram of the stator shown in Fig. 2;

Figure 4 is a schematic structural view of a pump body assembly for a reciprocating compressor according to an embodiment of the present application;

Figure 5 is an exploded view of the pump body assembly shown in Figure 4;

Figure 6 is a cross-sectional view of the pump body assembly shown in Figure 4;

Fig. 7 is a schematic structural diagram of the crankcase shown in Fig. 4;

Fig. 8 is another structural schematic diagram of the crankcase shown in Fig. 7;

Fig. 9 is another structural schematic diagram of the crankcase shown in Fig. 7;

Fig. 10 is a schematic structural diagram of the crankshaft shown in Fig. 4;

Fig. 11 is another structural schematic diagram of the crankshaft shown in Fig. 10;

Fig. 12 is a cross-sectional view of the connecting rod shown in Fig. 4.

Reference signs:

Reciprocating compressor 200,

Pump body assembly 100, stator 101, stator mounting hole 1011,

Crankcase 1, first plane 10, body portion 11, cylinder portion 12, crankshaft hole 110, central axis 110a of crankshaft hole, first portion 111, second portion 112, first stator mounting foot 113, second stator mounting Foot 114, cylinder bore 120, central axis 120a of the cylinder bore, oil guide groove 121,

Piston 2, piston pin 20, annular groove 21, first through hole 22, mating groove 23, second through hole 24,

Crankshaft 3, communicating passage 30, main shaft portion 31, mating section 310, counter shaft portion 32, balance weight 33, first oil storage chamber 311, first oil groove 312, first oil hole 313, bubble hole 314, second oil storage Cavity 321, second oil hole 322, second oil groove 323,

Connecting rod 4, second plane 40, first end 41, second end 42, shaft 43, first hole 411, central axis 411a of the first hole, second hole 421, central axis 421a of the second hole ,

Limit parts 5.

detailed description

The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary, and are only used to explain the present application, and cannot be understood as a limitation to the present application.

Hereinafter, a pump body assembly 100 for a reciprocating compressor 200 according to an embodiment of the present application will be described with reference to the accompanying drawings.

As shown in FIGS. 2 and 4 to 6, a pump body assembly 100 for a reciprocating compressor 200 according to an embodiment of the present application includes a crankcase 1, a piston 2, a crankshaft 3, and a connecting rod 4.

The crankcase 1 includes a body part 11 and a cylinder part 12. The body part 11 is formed with a crankshaft hole 110 whose axis extends in the vertical direction. The crankshaft hole 110 can penetrate the body part 11 vertically, and the cylinder part 12 is provided on the top of the body part 11. In addition, the cylinder portion 12 defines a cylinder hole 120 with an axis extending in the transverse direction, and the axial direction of the cylinder hole 120 is perpendicular to the axial direction of the crank hole 110.

The piston 2 is arranged in the cylinder bore 120 and the piston 2 is bored with a piston pin 20 whose axis extends in the vertical direction. The crankshaft 3 includes a main shaft portion 31 and a counter shaft portion 32. The main shaft portion 31 penetrates the crankshaft hole 110 and the main shaft portion 31 It is rotatably fitted to the crankshaft hole 110, the secondary shaft portion 32 is connected to the upper end of the main shaft portion 31 and the secondary shaft portion 32 is located above the main body portion 11, and the secondary shaft portion 32 is parallel to the main shaft portion 31, that is, the central axis of the secondary shaft portion 32 It is parallel to the central axis of the main shaft portion 31.

The connecting rod 4 is provided above the body portion 11 and the connecting rod 4 includes a first end 41 and a second end 42, a shaft 43 may be provided between the first end 41 and the second end 42, and the first end The portion 41 defines a first hole 411 fitted outside the piston pin 20, and the piston pin 20 penetrates the piston 2 and the first end 41 to connect the piston 2 and the first end 41, and the second end 42 defines When the second hole 421 fitted outside the secondary shaft portion 32 is sleeved, the secondary shaft portion 32 passes through the second hole 421.

Wherein, the crankcase 1 has a first plane 10, the first plane 10 passes through the central axis 120a of the cylinder bore and the first plane 10 is perpendicular to the central axis 110a of the crank bore, then the first plane 10 can be formed as the central axis through the cylinder bore 120a horizontal plane; the connecting rod 4 has a second plane 40, the second plane 40 through the center of the first hole 411 and the center of the second hole 421, and the second plane 40 and the center axis of the first hole 411a and the second hole The central axes 421a are all vertical, and the first plane 10 and the second plane 40 are parallel or overlapped. As a result, the pump body assembly 100 has a tight fit and compact structure, reduces the volume of the pump body assembly 100, and facilitates the miniaturization and lightweight design of the pump body assembly 100. Compared with the traditional technology, to ensure the movement of the crankshaft 3 Balance requires additional riveting of counterweights on the crankshaft 3, resulting in a large deviation between the connecting rod 4 and the cylinder portion 12 in the axial direction of the crankshaft 3 and the horizontal center plane of the connecting rod 4 intersects the horizontal center plane of the cylinder portion 12 The hidden danger of the line. During the operation of the pump body assembly 100 of the present application, the connecting rod 4 and the piston 2 are subjected to reasonable force, which prevents the piston 2 from being subjected to a large deflection force, and effectively reduces the gap between the piston 2 and the cylinder portion 12. The acting force further ensures the structural stability of the pump body assembly 100 during operation, and improves the reliability of the pump body assembly 100 in use.

When the first plane 10 coincides with the second plane 40, it can be understood that the distance between the first plane 10 and the second plane 40 is zero; when the first plane 10 and the second plane 40 are parallel, the first plane 10 There is no line of intersection with the second plane 40. At this time, the first plane 10 and the second plane 40 can be spaced apart, and in the axial direction of the crank hole 110 (for example, the vertical direction in FIG. 6), the first plane 10 It can be located on the side of the second plane 40 away from the main shaft portion 31 or close to the main shaft portion 31, and the first plane 10 can be located above or below the second plane 40.

Here, it should be noted that if the "center of the hole" is located on the center axis of the hole and at the center of the hole axis, the "center of the first hole 411" is located on the center axis 411a of the first hole and is located at the center of the first hole. At the axial center position of the hole 411, the “center of the second hole 421” is located on the central axis 421a of the second hole and at the axial center position of the second hole 421.

According to the pump body assembly 100 for the reciprocating compressor 200 according to the embodiment of the present application, the first plane 10 of the crankcase 1 and the second plane 40 of the connecting rod 4 are parallel or coincident, so that the pump body assembly 100 fits closely and effectively The structural stability and reliability of the pump body assembly 100 during assembly and operation are improved.

For example, as shown in Figures 7-9, the body portion 11 includes a first portion 111 and a second portion 112 located on both sides of the diameter of the crankshaft hole 110, the cylinder portion 12 is provided on the top of the first portion 111, There are two first stator mounting feet 113 at the bottom. The two first stator mounting feet 113 can be close to the end surface of the cylinder part 12 that is far away from the connecting rod 4. Each first stator mounting foot 113 can start from the first part. The bottom of 111 extends downward, and the bottom of the second part 112 has a second stator mounting foot 114. The second stator mounting foot 114 can be away from the end surface of the cylinder part 12 that is far from the connecting rod 4, and the second stator mounting foot 114 can It extends downward from the bottom of the second part 112. As a result, the two first stator mounting feet 113 and one second stator mounting foot 114 can be arranged in a triangle shape, which improves the structural stability of the crankcase 1 and prevents the pump body assembly 100 from generating a large amount of damage during installation and operation. Deformation, thereby further improving the structural stability and reliability of the pump body assembly 100

When the pump body assembly 100 is applied to the reciprocating compressor 200, a plurality of stator mounting holes 1011 may be formed on the stator 101 of the reciprocating compressor 200, and the plurality of stator mounting holes 1011 may be connected to the two first stator mounting feet respectively. 113. One second stator mounting foot 114 is correspondingly arranged, each first stator mounting foot 113 is matched with the corresponding stator mounting hole 1011, and the second stator mounting foot 114 is correspondingly matched with the corresponding stator mounting hole 1011 to realize the crankcase 1 The assembly with the stator 101, and the stator 101 and the crankcase 1 can be connected by fasteners such as bolts. Therefore, under the premise of ensuring the reliable connection between the crankcase 1 and the stator 101, the structure of the crankcase 1 is simplified, the material amount of the crankcase 1 is saved, the cost of the pump body assembly 100 is reduced, and the crankcase is improved. 1 and the assembly efficiency between the stator 101.

When the first plane 10 and the second plane 40 are parallel, the distance between the first plane 10 and the second plane 40 is less than or equal to 1 mm, for example, the distance between the first plane 10 and the second plane 40 may be 0.3 mm, Or 0.5mm, or 0.8mm, or 1mm. As a result, it is avoided that the first plane 10 and the second plane 40 deviate greatly in the axial direction of the crankshaft 3, resulting in greater friction between the piston 2 and the cylinder bore 120, which will affect the operating efficiency of the pump body assembly 100 and cause additional The high noise ensures the stable operation of the pump body assembly 100 and at the same time makes the pump body assembly 100 have good sound quality.

In some embodiments of the present application, the line L1 of the two first stator mounting legs 113 is perpendicular to the line L2 of the second stator mounting leg 114 and the crank hole 110 as projected along the axis of the crank hole 110. For example, as shown in Figures 7-9, on a plane perpendicular to the axis of the crankshaft hole 110, the line L1 can be the line between the orthographic projections of the centers of the two first stator mounting feet 113, and the line L2 can be the line between the orthographic projection of the center of the second stator mounting foot 114 and the orthographic projection of the center of the crank hole 110, the line L1 is perpendicular to the line L2, then the two first stator mounting feet 113 and the first The arrangement of the two stator mounting feet 114 is relatively regular, and the forces on the second stator mounting feet 114 and each of the first stator mounting feet 113 are relatively balanced,

In some embodiments of the present application, projected along the axis of the crankshaft hole 110, the line connecting one first stator mounting foot 113 and the crankshaft hole 110 is L3, and the other first stator mounting foot 113 and the crankshaft hole 110 The line of is L4, and the angle between L3 and L4 is an acute or right angle. Therefore, to a certain extent, it is beneficial to realize the miniaturization design of the reciprocating compressor 200. For example, in the example of FIGS. 7-9, on a plane perpendicular to the central axis 110a of the crankshaft hole, the line L3 may be an orthographic projection of the center of one of the two first stator mounting feet 113 and the crankshaft The line between the orthographic projection of the center of the hole 110, the line L4 may be the line between the orthographic projection of the center of the other of the two first stator mounting feet 113 and the orthographic projection of the center of the crankshaft hole 110 , The angle α between the line L3 and the line L4 is 90°, which facilitates the processing of the crankcase 1 and simplifies the processing technology of the crankcase 1, compared to the angle between the line L3 and the line L4 By setting it at an obtuse angle, the crankcase 1 in the present application is convenient to manufacture, and it is convenient to ensure the relative position between the two first stator mounting feet 113 and the cylinder portion 12, to ensure the manufacturing accuracy of the crankcase 1, thereby further ensuring The structural stability of the crankcase 1.

Of course, the angle α between the line L3 and the line L4 can also be an acute angle, which also facilitates the manufacture of the crankcase 1 and ensures the manufacturing accuracy and structural stability of the crankcase 1.

It should be noted that the angle between the line L3 and the line L4 refers to the orthographic projection of the center of the crankshaft hole 110 on a plane perpendicular to the axis of the crankshaft hole 110, and the two first stator mounting feet 113 corresponds to the central angle α.

For example, in the example of FIG. 9, the lengths of the line L3 and the line L4 are equal. When the pump body assembly 100 is applied to the reciprocating compressor 200, the forces on the two first stator mounting feet 113 are more balanced, and further The structural stability and use reliability of the pump body assembly 100 are ensured. Of course, the length of the line L3 and the line L4 may not be equal. The length of the line L3 is greater than the length of the line L2, which further makes the structure of the crankcase 1 compact, reduces the volume of the crankcase 1, and reduces the weight of the crankcase 1. At the same time, when the pump body assembly 100 is applied to a reciprocating compressor At 200 hours, the volume of the stator 101 assembled with the crankcase 1 can be reduced, which is beneficial to realize the miniaturization and lightweight design of the reciprocating compressor 200.

In some embodiments of the present application, a first oil storage cavity 311 with an open bottom is formed in the main shaft portion 31, a first oil groove 312 is formed on the outer peripheral wall of the main shaft portion 31, and a first oil reservoir 312 is formed on the main shaft portion 31. The cavity 311 communicates with the first oil hole 313 and the bubble hole 314, the first oil hole 313 penetrates outward to communicate with the first oil groove 312, the bubble hole 314 penetrates outward to the outer peripheral wall of the main shaft portion 31, and the bubble hole 314 is connected to the first oil groove 312. The oil grooves 312 are spaced apart. For example, as shown in FIGS. 6, 10, and 11, the first oil storage cavity 311 may penetrate the lower end surface of the main shaft portion 31, the main shaft portion 31 may have a mating section 310 that fits with the crank hole 110, and the bubble hole 314 is located in the mating section 310, and the bubble hole 314 penetrates the outer peripheral wall of the main shaft portion 31, so that when oil flows to the bubble hole 314 through the first oil storage cavity 311, the foam generated by the crankshaft 3 agitation can be discharged through the bubble hole 314, and to Flow down to the oil storage tank again to prevent foam from affecting the lubrication effect of the pump body assembly 100. The first oil groove 312 may be formed on the outer peripheral wall of the mating section 310, the first oil groove 312 extends spirally, and the first oil groove 312 may be formed by a part of the outer peripheral wall of the mating section 310 being recessed toward the central axis of the main shaft portion 31, then the first The oil groove 312 may extend along the three-dimensional spiral line on the outer peripheral wall of the mating section 310; the first oil hole 313 may be located at the end of the first oil groove 312, and the oil in the first oil storage cavity 311 may flow to The first oil groove 312 is used to lubricate the rotating pair formed by the mating section 310 and the body portion 11. Of course, the first oil groove 312 can also extend along other curves, and is not limited to a spiral line.

When the pump body assembly 100 is applied to the reciprocating compressor 200, an oil storage tank may be formed at the bottom of the reciprocating compressor 200, and a certain amount of oil may be stored in the oil storage tank, and a pump oil structure may be provided in the first oil storage cavity 311 , The oil pump structure can deliver the oil in the oil storage tank to the first oil storage cavity 311; when the oil flows to the bubble hole 314, the foam in the oil can be discharged through the bubble hole 314, and the oil in the first oil storage cavity 311 The oil can flow into the first oil groove 312 through the first oil hole 313 under the action of the centrifugal force generated by the rotation of the crankshaft 3 and flow along the first oil groove 312 to lubricate the rotating pair formed by the mating section 310 and the body portion 11. As a result, effective lubrication between the crankshaft 3 and the crankcase 1 is realized, and the reliability of the pump body assembly 100 is ensured.

In some embodiments of the present application, a second oil storage chamber 321 is formed in the countershaft portion 32, and a communication passage 30 connecting the first oil storage chamber 311 and the second oil storage chamber 321 is formed in the crankshaft 3, and the countershaft portion A second oil hole 322 communicating with the second oil storage cavity 321 is formed on the 32, and the second oil hole 322 penetrates outward to the outer peripheral wall of the secondary shaft portion 32. For example, as shown in Figures 6, 10 and 11, a balance weight 33 can be provided between the main shaft portion 31 and the secondary shaft portion 32, the main shaft portion 31 can be connected to the lower end of the balance weight 33, and the secondary shaft portion 32 can be connected to At the upper end of the balance weight 33, the communication passage 30 can penetrate the upper and lower end surfaces of the balance weight 33, and the lower end of the communication passage 30 is in communication with the first oil storage chamber 311, and the upper end of the communication passage 30 is in communication with the second oil storage chamber 321, The second oil hole 322 penetrates the outer peripheral wall of the countershaft portion 32, so the oil in the first oil storage chamber 311 can flow into the second oil storage chamber 321 through the communication channel 30, and flow to the second oil chamber 321 through the second oil hole 322. The end portion 42 and the secondary shaft portion 32 are used to lubricate the rotating pair formed by the second end portion 42 and the secondary shaft portion 32. Thus, effective lubrication between the crankshaft 3 and the connecting rod 4 is realized, and the reliability of the pump body assembly 100 is further ensured.

For example, in the examples of FIGS. 6, 10, and 11, there may be two first oil holes 313, and the two first oil holes 313 are located at the two axial ends of the first oil groove 312, and each first oil hole 313 respectively penetrates the outer peripheral wall of the main shaft portion 31, and each first oil hole 313 is respectively communicated with the first oil groove 312, and the first oil hole 313 located at the lower end of the first oil groove 312 can directly communicate with the first oil storage cavity 311. The first oil hole 313 at the upper end of the first oil groove 312 may be indirectly communicated with the first oil storage cavity 311 through the first oil groove 312, and the first oil hole 313 at the upper end of the first oil groove 312 communicates with the communication passage 30. When the pump body assembly 100 is applied to the reciprocating compressor 200, the oil in the first oil storage chamber 311 can flow into the first oil groove 312 through the lower first oil hole 313 under the action of centrifugal force, and along the first oil groove 312 Flow to lubricate the rotating pair formed by the main body portion 11 and the main shaft portion 31; then the oil in the first oil groove 312 flows into the communicating passage 30 through the upper first oil hole 313, and the oil in the communicating passage 30 flows to the second reservoir The oil cavity 321 flows through the second oil hole 322 to between the second end 42 and the secondary shaft 32.

Wherein, the second oil storage cavity 321 may penetrate the upper end surface of the secondary shaft portion 32, so that a part of the oil in the second oil storage cavity 321 flows through the second oil hole 322 to between the second end portion 42 and the secondary shaft portion 32, In addition, another part of the oil in the second oil storage chamber 321 can be thrown out under the action of centrifugal force and spilled onto other parts of the reciprocating compressor 200 such as the cylinder part 12 to lubricate other parts.

Further, as shown in FIGS. 6, 10 and 11, a second oil groove 323 is formed on the outer peripheral wall of the secondary shaft portion 32, and the second oil groove 323 can be turned from a part of the outer peripheral wall of the secondary shaft portion 32 toward the secondary shaft portion 32 The central axis is recessed, the second oil hole 322 may be located at the end of the second oil groove 323, and the second oil hole 322 communicates with the second oil groove 323, then flows from the second oil hole 322 to the second end 42 and the auxiliary The oil between the shaft portions 32 can flow along the second oil groove 323 to better lubricate the rotating pair formed by the second end portion 42 and the counter shaft portion 32. At the same time, to a certain extent, the second oil groove 323 is beneficial to the second oil groove 323. The excess oil between the end portion 42 and the countershaft portion 32 is thrown onto other components of the reciprocating compressor 200 such as the cylinder portion 12 to lubricate other components.

For example, in the example of FIGS. 5-7, an oil guide groove 121 is formed on the cylinder part 12, the oil guide groove 121 may be located at the end of the cylinder part 12, and the oil guide groove 121 may penetrate the inner and outer peripheral walls of the cylinder part 12. The oil guide groove 121 is connected to the cylinder bore 120, so that during the operation of the pump body assembly 100, the excess oil between the second end 42 and the secondary shaft portion 32 can be spilled to the oil guide groove 121 to lubricate the cylinder portion 12 and the piston 2 Along the extension direction of the second oil groove 323, the concave depth of the second oil groove 323 is gradually reduced to avoid the accumulation of more oil between the second end portion 42 and the counter shaft portion 32, and facilitate the removal of excess oil The rapid ejection enables good oil circulation in the reciprocating compressor 200, and ensures the lubrication effect of the reciprocating compressor 200.

It can be understood that the second oil groove 323 may extend along a curve, for example, the second oil groove 323 may extend along a three-dimensional spiral line, or may extend along a circular arc line.

In some embodiments of the present application, as shown in FIGS. 5-7, an oil guide groove 121 is formed on the cylinder portion 12. The oil guide groove 121 may be located at the end of the cylinder portion 12, and the oil guide groove 121 may be close to the cylinder portion 12. A part of the end surface of one end of the center of the connecting rod 4 is recessed and formed in a direction away from the center of the connecting rod 4, so that the oil guide groove 121 can be roughly formed as a U-shaped groove, and the oil guide groove 121 can penetrate the inner and outer peripheral walls of the cylinder portion 12, so that The oil guide groove 121 is connected to the cylinder bore 120, so that the oil spilled at the oil guide groove 121 can flow into the cylinder bore 120 during the operation of the pump body assembly 100, and the piston 2 is provided in the cylinder bore 120, so the oil at the oil guide groove 121 Oil can flow between the cylinder bore 120 and the piston 2 to lubricate the moving pair formed by the cylinder portion 12 and the piston 2; the outer peripheral wall of the piston 2 is formed with an annular groove 21 extending in the circumferential direction of the cylinder bore 120. 21 can be formed by recessing part of the outer peripheral wall of the piston 2. The first hole 22 on the piston 2 for piercing the piston pin 20 is in communication with the annular groove 21, so that the piston 2 is in the cylinder bore during the operation of the pump body assembly 100 By reciprocating within 120, the annular groove 21 can move to a position communicating with the oil guide groove 121, and the oil at the oil guide groove 121 can flow into the annular groove 21 and move with the annular groove 21 to a position that matches the cylinder bore 120. The lubrication effect between the cylinder portion 12 and the piston 2 is effectively improved, and the oil in the annular groove 21 can flow into the first through hole 22 to lubricate the rotation pair formed by the piston pin 20 and the first end portion 41.

4-6, the piston 2 also has a second perforation 24, the second perforation 24 is perpendicular to the first perforation 22, that is, the central axis of the second perforation 24 is perpendicular to the central axis of the first perforation 22, The perforation 24 is provided with a limiting member 5. Since the second perforation 24 is connected to the first perforation 22, when the limiting member 5 passes through the second perforation 24, it is convenient for the limiting member 5 to pass through the piston pin 20 to restrict the piston. The axial movement of the pin 20 realizes the limitation of the piston pin 20, and prevents the piston pin 20 from breaking away from the first through hole 22 and causing the first end 41 to disengage from the piston 2, thereby further ensuring the reliability of the pump body assembly 100.

Wherein, the piston pin 20 is in clearance fit with the first through hole 22, which facilitates the quick penetration of the piston pin 20 in the first through hole 22, which improves the assembly efficiency of the pump body assembly 100; the limiting member 5 may be an elastic pin, but is not limited to this.

In some embodiments of the present application, as shown in FIG. 6, the diameter of the main shaft portion 31 is D1, and the diameter of the secondary shaft portion 32 is d1, which satisfies: 1.1≤D1/d1≤1.5, the diameter of the main shaft portion 31 and the secondary shaft There is an appropriate proportional relationship between the diameters of the parts 32, the main shaft part 31 and the counter shaft part 32 have good reliability in use, so that the crankshaft 3 has a stable structure, reliable use, flexible design, and easy to ensure the dynamic balance of the crankshaft 3, and It avoids that D1/d1 is too large to make the main shaft 31 and the counter shaft part 32 have a large difference, which causes the crankshaft 3 to be easily deformed, and it avoids that D1/d1 is too small to make the main shaft 31 and the counter shaft 32 have a small difference and cannot be compared with the crankcase. 1 and connecting rod 4 better match.

In some embodiments of the present application, as shown in FIGS. 6 and 12, the diameter of the first hole 411 is d2, and the diameter of the second hole 421 is D2, which satisfies: 1.5≤D2/d2≤2.5, and the first hole 411 There is a proper proportional relationship between the diameter of the second hole 421 and the diameter of the second hole 421, which is convenient to ensure that the connecting rod 4 is stable in structure, reliable in use, and flexible in design, and avoids that D2/d2 is too large to make the first end 41 and the second end The large difference between 42 leads to easy deformation of the structure of the connecting rod 4, which avoids that D2/d2 is too small, and the difference between the first end 41 and the second end 42 is too small to be better matched with the piston pin 20 and the counter shaft 32 .

In some embodiments of the present application, as shown in FIGS. 5, 6 and 12, the height h of the first end 41 is the axial length of the first hole 411, that is, the first hole 411 penetrates the first end 41 At both ends of the height direction, the piston 2 is formed with a fitting groove 23 for accommodating the first end 41. The fitting groove 23 can be turned from a part of the surface of the piston 2 on the side close to the center of the connecting rod 4 toward the center away from the center of the connecting rod 4 The height of the fitting groove 23 in the axial direction of the piston pin 20 is H, where h<H, then the first end 41 and the fitting groove 23 are in clearance fit, so as to facilitate the first end 41 is quickly fitted to the fitting groove 23, which improves the assembly efficiency of the pump body assembly 100.

Wherein, the fitting gap y between the first end 41 and the fitting groove 23 satisfies: 0.2mm≤y≤0.6mm, then there is a suitable fitting gap between the first end 41 and the fitting groove 23, which ensures that the first end 41 Under the premise of the efficiency of the assembly with the matching groove 23, the limiting effect of the matching groove 23 on the first end 41 in the axial direction of the piston pin 20 is ensured, and the first end of the crankshaft 3 is prevented from driving the connecting rod 4 in operation. The one end 41 produces a relatively large shaking relative to the piston 2, thereby reducing the vibration of the pump body assembly 100 and reducing operating noise.

As shown in FIG. 5, in the direction perpendicular to the axis of the piston pin 20, the maximum width of the fitting groove 23 is greater than the maximum width of the first end 41, so as to avoid the connecting rod 4 and the piston 2 during the operation of the pump body assembly 100 Interference occurs to ensure the normal operation of the pump body assembly 100.

The reciprocating compressor 200 according to the embodiment of the second aspect of the present application includes the pump body assembly 100 for the reciprocating compressor 200 according to the embodiment of the first aspect of the present application.

For example, as shown in Figures 1 to 3, the reciprocating compressor 200 includes a stator 101 and a rotor. The rotor is sleeved in the stator 101 and the rotor is in interference fit with the crankshaft 3. The crankcase 1 passes through the first stator mounting foot 113 and The second stator mounting foot 114 is installed on the stator; when the reciprocating compressor 200 is running, the rotor drives the crankshaft 3 to rotate, and the connecting rod 4 drives the piston 2 to reciprocate in the cylinder part 12, and the piston 2 is in the cylinder part 12 The reciprocating movement drives the valve group at the end of the cylinder part 12 to complete the processes of suction, compression and exhaust.

According to the reciprocating compressor 200 of the embodiment of the present application, by using the above-mentioned pump body assembly 100, the structural stability and reliability of the reciprocating compressor 200 during assembly and operation are improved.

Other configurations and operations of the reciprocating compressor 200 according to the embodiment of the present application are known to those of ordinary skill in the art, and will not be described in detail here.

In the description of this application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Axial", "Radial", "Circumferential" The orientation or positional relationship of other indications is based on the orientation or positional relationship shown in the drawings, which is only used to facilitate the description of the application and simplify the description, and does not indicate or imply that the device or element referred to must have a specific orientation and a specific orientation. The azimuth structure and operation cannot be understood as a limitation of the application. In the description of this application, "plurality" means two or more.

In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples" etc. means to incorporate the implementation The specific features, structures, materials, or characteristics described by the examples or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above-mentioned terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner.

Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and modifications can be made to these embodiments without departing from the principle and purpose of the present application. The scope of the application is defined by the claims and their equivalents.

Claims

A pump body assembly for a reciprocating compressor, characterized in that it comprises:

A crankcase, the crankcase includes a body portion and a cylinder portion, the body portion is formed with a crankshaft hole with an axis extending vertically, and the cylinder portion is provided on the top of the body portion and defines an axis extending transversely Cylinder bore

A piston, the piston is arranged in the cylinder bore and a piston pin with an axis extending vertically is passed through the piston;

A crankshaft, the crankshaft includes a main shaft portion and a counter shaft portion, the main shaft portion penetrates the crankshaft hole, the counter shaft portion is connected to the upper end of the main shaft portion, and the counter shaft portion is connected to the main shaft portion Parallel, the secondary shaft part is located above the body part;

A connecting rod, the connecting rod is arranged above the body and includes a first end and a second end, the first end defines a first hole sleeved outside the piston pin, the The second end portion defines a second hole sleeved outside the countershaft portion, wherein the crankcase has a first plane, and the first plane passes through the central axis of the cylinder hole and is connected to the crankshaft hole. The central axis of the connecting rod is perpendicular, and the connecting rod has a second plane that passes through the center of the first hole and the center of the second hole, and is connected to the center axis of the first hole and the first hole. The central axes of the two holes are both perpendicular, and the first plane is parallel to or coincides with the second plane.
The pump body assembly for a reciprocating compressor according to claim 1, wherein the body portion includes a first portion and a second portion located on both sides of the diameter of the crankshaft hole, and the cylinder portion is provided at The top of the first part and the bottom of the first part are provided with two first stator mounting feet, and the bottom of the second part is provided with a second stator mounting foot.
The pump body assembly for a reciprocating compressor according to claim 1 or 2, wherein when the first plane and the second plane are parallel, the first plane and the second plane The distance between them is less than or equal to 1mm.
The pump body assembly for a reciprocating compressor according to claim 2, characterized in that, along the axis of the crankshaft hole, the line L1 of the two first stator mounting feet is perpendicular to the The connecting line L2 between the second stator mounting foot and the crankshaft hole.
The pump body assembly for a reciprocating compressor according to claim 2 or 4, characterized in that, along the axis of the crankshaft hole, one of the first stator mounting feet and the crankshaft hole are projected The connection line is L3, and the connection line between the other first stator mounting foot and the crankshaft hole is L4, and the included angle between the L3 and the L4 is an acute angle or a right angle.
The pump body assembly for a reciprocating compressor according to any one of claims 1-5, wherein a first oil storage cavity with an open bottom is formed in the main shaft portion, and the outer peripheral wall of the main shaft portion A first oil groove is formed on the main shaft portion, a first oil hole and a bubble hole communicating with the first oil storage cavity are formed on the main shaft portion, and the first oil hole penetrates outward to communicate with the first oil groove, The air bubble hole penetrates outward to the outer peripheral wall of the main shaft part and is spaced apart from the first oil groove.
The pump body assembly for a reciprocating compressor according to claim 6, wherein a second oil storage chamber is formed in the countershaft portion, and a second oil storage chamber is formed in the crankshaft to communicate with the first oil storage chamber. In the communication passage of the second oil storage chamber, a second oil hole communicating with the second oil storage chamber is formed on the secondary shaft portion, and the second oil hole penetrates outward to the secondary shaft portion Peripheral wall.
The pump body assembly for a reciprocating compressor according to claim 7, wherein a second oil groove is formed on the outer peripheral wall of the countershaft portion, and the second oil groove is in communication with the second oil hole .
The pump body assembly for a reciprocating compressor according to any one of claims 1-8, wherein the diameter of the main shaft portion is D1, and the diameter of the counter shaft portion is d1, which satisfies: 1.1 ≤D1/d1≤1.5.
The pump body assembly for a reciprocating compressor according to any one of claims 1-9, wherein the diameter of the first hole is d2, and the diameter of the second hole is D2, satisfying: 1.5≤D2/d2≤2.5.
The pump body assembly for a reciprocating compressor according to any one of claims 1-10, wherein the height h of the first end portion is the axial length of the first hole, and the The piston is formed with a mating groove for accommodating the first end, and the height of the mating groove in the axial direction of the piston pin is H, where h<H, and the first end and the The fitting clearance y of the fitting groove satisfies: 0.2mm≤y≤0.6mm.
A reciprocating compressor, characterized by comprising the pump body assembly for a reciprocating compressor according to any one of claims 1-11.