CN111637036A - Pump body assemblies and reciprocating compressors for reciprocating compressors - Google Patents

Abstract

The invention discloses a pump body assembly for a reciprocating compressor and the reciprocating compressor, wherein the pump body assembly comprises a crank case, a piston, a crank shaft and a connecting rod, the connecting rod comprises a first end part and a second end part, the first end part limits a first hole, the second end part limits a second hole, the crank case is provided with a first plane, the first plane passes through the central axis of a cylinder hole and is perpendicular to the central axis of the crank hole, the connecting rod is provided with a second plane, the second plane is perpendicular to the central axis of the first hole and the central axis of the second hole, and the first plane and the second plane are parallel or coincident. The pump body assembly for the reciprocating compressor has the advantages of stable structure and reliable operation.

Description

Pump body assemblies and reciprocating compressors for reciprocating compressors

technical field

The present invention relates to the technical field of compressors, in particular to a pump body assembly for a reciprocating compressor and a reciprocating compressor.

Background technique

A reciprocating compressor usually includes mechanical parts and electrical drive parts. The mechanical parts generally use a reciprocating crank connecting rod mechanism and include crankshafts, connecting rods, crankcases, pistons, cylinders, and valve groups. The electrical drive parts 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 group to complete the processes of suction, compression and exhaust.

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

SUMMARY OF THE INVENTION

The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention proposes a pump body assembly for a reciprocating compressor, the pump body assembly is stable in structure and reliable in operation.

The present invention also provides a reciprocating compressor with the above pump body assembly.

A pump body assembly for a reciprocating compressor according to an embodiment of the first aspect of the present invention includes: a crankcase, the crankcase includes a body part and a cylinder part, and a crankshaft whose axis extends vertically is formed on the body part a hole, the cylinder part is provided on the top of the body part and defines a cylinder hole with an axis extending laterally; a piston, the piston is provided in the cylinder hole and the piston is provided with an axis extending vertically The piston pin; the crankshaft, the crankshaft includes a main shaft part and an auxiliary shaft part, the main shaft part passes through the crankshaft hole, the auxiliary shaft part is connected with the upper end of the main shaft part, and the auxiliary shaft part is connected to the upper end of the main shaft part. The main shaft parts are parallel, the auxiliary shaft parts are located above the main body part; the connecting rod is arranged above the main body part and includes a first end part and a second end part, the first an end portion defines a first bore that fits over the piston pin, the second end portion defines a second bore that fits over the countershaft portion, wherein the crankcase has a first flat surface, 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 third 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 and the second plane are parallel or coincident.

According to the pump body assembly for the reciprocating compressor according to the embodiment of the present invention, the first plane of the crankcase and the second plane of the connecting rod are arranged 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 cooperate closely, which effectively improves the structural stability and use reliability of the pump body components during assembly and operation.

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

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

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

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

According to some embodiments of the present invention, a second oil storage chamber is formed in the auxiliary shaft portion, and a communication channel that communicates with the first oil storage chamber and the second oil storage chamber is formed in the crankshaft. A second oil hole communicated with the second oil storage chamber is formed on the shaft portion, and the second oil hole penetrates outward to the outer peripheral wall of the auxiliary shaft portion.

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

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

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

According to some embodiments of the present invention, the height h of the first end portion is the axial length of the first hole, and a fitting groove for accommodating the first end portion is formed on the piston, and the fitting groove is formed on the piston. The height in the axial direction of the piston pin is H, wherein h<H, and the fitting clearance 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 invention includes the pump body assembly for the reciprocating compressor according to the embodiment of the first aspect of the present invention.

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

Additional aspects and advantages of the present invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

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

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

Fig. 3 is the structural representation of the stator shown in Fig. 2;

4 is a schematic structural diagram of a pump body assembly for a reciprocating compressor according to an embodiment of the present invention;

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 the structural representation 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;

Figure 10 is a schematic structural diagram of the crankshaft shown in Figure 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 number:

Reciprocating compressor 200,

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

Crankcase 1, first plane 10, body part 11, cylinder part 12,

The crankshaft hole 110, the central axis 110a of the crankshaft hole, the first part 111, the second part 112,

The first stator mounting feet 113, the second stator mounting feet 114,

The cylinder hole 120, the central axis 120a of the cylinder hole, the oil guide groove 121,

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

Crankshaft 3, communication channel 30, main shaft part 31, matching section 310, auxiliary shaft part 32, balance weight 33,

The first oil storage chamber 311, the first oil groove 312, the first oil hole 313, the air bubble hole 314,

The second oil storage chamber 321, the second oil hole 322, the second oil groove 323,

connecting rod 4, second plane 40, first end 41, second end 42, shaft 43,

The first hole 411 , the central axis 411 a of the first hole, the second hole 421 , the central axis 421 a of the second hole, and the limiting member 5 .

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, only used to explain the present invention, and should not be construed as a limitation of the present invention.

The pump body assembly 100 for the reciprocating compressor 200 according to the embodiment of the present invention will be described below with reference to the accompanying drawings.

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

The crankcase 1 includes a main body part 11 and a cylinder part 12 . The main body part 11 is formed with a crankshaft hole 110 whose axis extends vertically. And the cylinder portion 12 defines a cylinder bore 120 with an axis extending in the transverse direction, and the axial direction of the cylinder bore 120 is perpendicular to the axial direction of the crankshaft bore 110 .

The piston 2 is arranged in the cylinder hole 120 and the piston pin 20 with the axis extending vertically is inserted through the piston 2. The crankshaft 3 includes a main shaft portion 31 and a secondary shaft portion 32. It is rotatably fitted in the crankshaft hole 110 , the auxiliary shaft portion 32 is connected to the upper end of the main shaft portion 31 , the auxiliary shaft portion 32 is located above the main body portion 11 , and the auxiliary shaft portion 32 is parallel to the main shaft portion 31 , that is, the central axis of the auxiliary shaft portion 32 It is parallel to the central axis of the main shaft portion 31 .

The connecting rod 4 is arranged above the body portion 11 and the connecting rod 4 includes a first end portion 41 and a second end portion 42 . A rod body 43 may be provided between the first end portion 41 and the second end portion 42 . The portion 41 defines a first hole 411 that fits outside the piston pin 20, and the piston pin 20 is inserted through the piston 2 and the first end portion 41 to connect the piston 2 and the first end portion 41, and the second end portion 42 defines The second hole 421 is fitted outside the auxiliary shaft portion 32 , and the auxiliary shaft portion 32 is inserted 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 hole and the first plane 10 is perpendicular to the central axis 110a of the crankshaft hole, then the first plane 10 can be formed to pass through the central axis of the cylinder hole The horizontal plane of 120a; the connecting rod 4 has a second plane 40, the second plane 40 passes through the center of the first hole 411 and the center of the second hole 421, and the second plane 40 is connected to the center axis 411a of the first hole and the second hole. The central axes 421a are both vertical, and the first plane 10 and the second plane 40 are parallel or coincident. Therefore, the pump body assembly 100 is closely matched and has a compact structure, which reduces the volume of the pump body assembly 100 , which facilitates the miniaturization and lightweight design of the pump body assembly 100 . The balance requires additional riveting of the counterweight on the crankshaft 3, resulting in a large deviation in the axial direction of the crankshaft 3 between the connecting rod 4 and the cylinder portion 12, and there is an intersection between the horizontal center plane of the connecting rod 4 and the horizontal center plane of the cylinder portion 12. During the operation of the pump body assembly 100 of the present application, the force on the connecting rod 4 and the piston 2 is reasonable, which prevents the piston 2 from being subjected to a large deflection force, and effectively reduces the friction between the piston 2 and the cylinder part 12. Therefore, the structural stability of the pump body assembly 100 is further ensured during operation, and the use reliability of the pump body assembly 100 is improved.

When the first plane 10 and the second plane 40 coincide, 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 crankshaft hole 110 (for example, the vertical direction in FIG. The second plane 40 may be located on the side of the second plane 40 away from the main shaft portion 31 or on the side close to the main shaft portion 31 , and the first plane 10 may 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 is located at the center position in the axial direction of the hole, the "center of the first hole 411" is located on the center axis 411a of the first hole and is located in the center of the first hole 411a. At the axial center position of the hole 411 , the “center of the second hole 421 ” is located on the center axis 421 a 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 invention, 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 tightly, effectively The structural stability and use reliability of the pump body assembly 100 during assembly and operation are improved.

Specifically, as shown in FIGS. 7-9 , the body portion 11 includes a first portion 111 and a second portion 112 located on both sides of the crankshaft hole 110 in diameter, the cylinder portion 12 is provided on the top of the first portion 111 , and the first portion 111 The bottom has two first stator mounting feet 113, the two first stator mounting feet 113 can be close to the end face of the end of the cylinder part 12 away from the connecting rod 4, and each first stator mounting foot 113 can be The bottom of the part 111 extends downward, 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 face of the end of the cylinder part 12 away from the connecting rod 4, the second stator mounting foot 114 It may extend downward from the bottom of the second part 112 . Therefore, the two first stator mounting feet 113 and the one second stator mounting foot 114 can be arranged in a triangle, which improves the structural stability of the crankcase 1 and prevents the pump body assembly 100 from generating large 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 respectively connected with the two first stator mounting feet 113. A 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 matched with the corresponding stator mounting hole 1011, so as to realize the crankcase 1 Assembly with the stator 101, and the stator 101 and the crankcase 1 can be connected by fasteners such as bolts and the like. Therefore, on the premise of ensuring the reliable connection between the crankcase 1 and the stator 101 , the structure of the crankcase 1 is simplified, the amount of materials used for the crankcase 1 is saved, the cost of the pump body assembly 100 is reduced, and the crankcase is improved. Assembly efficiency between 1 and stator 101.

Specifically, 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 0.3mm, or 0.5mm, or 0.8mm, or 1mm. In this way, 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 a greater friction between the piston 2 and the cylinder bore 120, which affects the operation efficiency of the pump body assembly 100 and causes extra It 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 invention, projected along the axis direction of the crankshaft hole 110 , the connecting line L1 of the two first stator mounting feet 113 is perpendicular to the connecting line L2 between the second stator mounting foot 114 and the crankshaft hole 110 . For example, as shown in FIGS. 7-9 , on a plane perpendicular to the axis of the crankshaft hole 110 , the connecting line L1 may be the connecting line between the orthographic projections of the centers of the two first stator mounting feet 113 . The connecting line L2 can be the connection line between the orthographic projection of the center of the second stator mounting feet 114 and the orthographic projection of the center of the crankshaft hole 110 , the connection line L1 is perpendicular to the connection line L2, then the two first stator mounting feet 113 and the The arrangement of the two stator mounting feet 114 is relatively regular, and the forces of the second stator mounting feet 114 and each of the first stator mounting feet 113 are relatively balanced.

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

Of course, the angle α between the connecting line L3 and the connecting 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 connecting line L3 and the connecting line L4 refers to the plane perpendicular to the axis of the crankshaft hole 110 , taking the orthographic projection of the center of the crankshaft hole 110 as the center of the circle, and the two first stator mounting feet 113 corresponds to the central angle α.

Optionally, in the example of FIG. 9 , the lengths of the connecting line L3 and the connecting 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 relatively balanced. , further ensuring the structural stability and use reliability of the pump body assembly 100 . Of course, the lengths of the connection line L3 and the connection line L4 may not be equal. The length of the connecting line L3 is greater than the length of the connecting 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 the reciprocating compressor 200, 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 invention, 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 storage chamber 312 is formed on the main shaft portion 31 . The first oil hole 313 and the air bubble hole 314 communicate with the cavity 311. The first oil hole 313 penetrates outward to communicate with the first oil groove 312. The air bubble hole 314 penetrates outward to the outer peripheral wall of the main shaft portion 31. Oil sump 312 is spaced apart. For example, as shown in FIG. 6 , FIG. 10 and FIG. 11 , the first oil storage chamber 311 may pass through the lower end surface of the main shaft portion 31 , and the main shaft portion 31 may have a fitting section 310 that is matched with the crankshaft hole 110 , and the air bubble hole 314 is located in the fitting section 310, and the bubble hole 314 penetrates the outer peripheral wall of the main shaft part 31, so that when the oil flows to the bubble hole 314 through the first oil storage chamber 311, the foam generated by the stirring of the crankshaft 3 can be discharged through the bubble hole 314 and flow to the bubble hole 314. Then, it flows back to the oil storage tank to prevent the foam from affecting the lubricating effect of the pump body assembly 100 . The first oil groove 312 may be formed on the outer peripheral wall of the fitting section 310 , the first oil groove 312 spirally extends, and the first oil groove 312 may be formed by a part of the outer peripheral wall of the fitting section 310 concave toward the central axis of the main shaft portion 31 , then the first oil groove 312 may be concave. The oil groove 312 may extend along a three-dimensional helical line on the outer peripheral wall of the fitting 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 through the first oil hole 313 to Inside the first oil groove 312 , the rotating pair formed by the mating section 310 and the main body 11 is lubricated. Of course, the first oil groove 312 may also extend along other curves, and is not limited to a helix.

When the pump body assembly 100 is applied to the reciprocating compressor 200, an oil storage pool may be formed at the bottom of the reciprocating compressor 200, a certain amount of oil may be stored in the oil storage pool, and a pump oil structure may be arranged in the first oil storage chamber 311 , the oil pump structure can transport 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 first oil storage cavity 311. 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 main body 11 . Thus, effective lubrication between the crankshaft 3 and the crankcase 1 is achieved, and the reliability of the pump body assembly 100 is ensured.

In some specific embodiments of the present invention, the secondary shaft portion 32 is formed with a second oil storage chamber 321 , and the crankshaft 3 is formed with a communication channel 30 that communicates with the first oil storage chamber 311 and the second oil storage chamber 321 . A second oil hole 322 communicated with the second oil storage chamber 321 is formed on the portion 32 , and the second oil hole 322 penetrates outward to the outer peripheral wall of the auxiliary shaft portion 32 . For example, as shown in FIGS. 6 , 10 and 11 , a balance block 33 may be provided between the main shaft portion 31 and the auxiliary shaft portion 32 , the main shaft portion 31 may be connected to the lower end of the balance weight 33 , and the auxiliary shaft portion 32 may be connected to On the upper end of the balance block 33, the communication channel 30 can pass through the upper end surface and the lower end surface of the balance block 33, and the lower end of the communication channel 30 is communicated with the first oil storage chamber 311, and the upper end of the communication channel 30 is communicated with the second oil storage chamber 321, The second oil hole 322 penetrates the outer peripheral wall of the countershaft portion 32 , so that 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 storage chamber 321 through the second oil hole 322 The rotating pair formed by the second end portion 42 and the secondary shaft portion 32 is lubricated between the end portion 42 and the secondary shaft portion 32 . As a result, effective lubrication between the crankshaft 3 and the connecting rod 4 is achieved, which further ensures the reliability of the pump body assembly 100 in use.

For example, in the examples of FIG. 6 , FIG. 10 and FIG. 11 , there may be two first oil holes 313 , and the two first oil holes 313 are respectively located at both axial ends of the first oil groove 312 , and each first oil hole 313 313 respectively penetrate the outer peripheral wall of the main shaft portion 31, and each first oil hole 313 is respectively connected with the first oil groove 312, the first oil hole 313 located at the lower end of the first oil groove 312 can be directly connected with the first oil storage cavity 311, located in The first oil hole 313 on the upper end of the first oil groove 312 can indirectly communicate with the first oil storage chamber 311 through the first oil groove 312 , and the first oil hole 313 on the upper end of the first oil groove 312 communicates with the communication channel 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 flow along the first oil groove 312 Then, the oil in the first oil groove 312 flows into the communication channel 30 through the first oil hole 313 above, and the oil in the communication channel 30 flows to the second reservoir. The oil chamber 321 flows to between the second end portion 42 and the countershaft portion 32 through the second oil hole 322 .

Wherein, the second oil storage cavity 321 can penetrate through the upper end surface of the auxiliary 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 the space between the second end portion 42 and the auxiliary 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 sprinkled on other components of the reciprocating compressor 200 , such as the cylinder portion 12 , to lubricate the other components.

Further, as shown in FIGS. 6 , 10 and 11 , a second oil groove 323 is formed on the outer peripheral wall of the counter shaft portion 32 . The central axis is formed concavely, the second oil hole 322 can be located at the end of the second oil groove 323, and the second oil hole 322 is communicated with the second oil groove 323, then the flow from the second oil hole 322 to the second end 42 and the auxiliary The oil between the shaft parts 32 can flow along the second oil groove 323 to better lubricate the rotating pair formed by the second end part 42 and the auxiliary shaft part 32 . 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 the other components.

Optionally, in the examples 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 peripheral wall and the outer periphery of the cylinder part 12 so that the oil guide groove 121 is connected to the cylinder hole 120, so that the excess oil between the second end part 42 and the countershaft part 32 can be sprinkled to the oil guide groove 121 during the operation of the pump body assembly 100 to lubricate the cylinder part 12 and the auxiliary shaft part 32. The moving pair formed by the piston 2; along the extension direction of the second oil groove 323, the concave depth of the second oil groove 323 gradually decreases, so as to avoid the accumulation of more oil between the second end portion 42 and the secondary shaft portion 32, and it is convenient to remove excess oil. The oil is quickly thrown out, so that the reciprocating compressor 200 has a good oil circulation, and the lubricating effect of the reciprocating compressor 200 is guaranteed.

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 helix, or may extend along a circular arc.

In some embodiments of the present invention, as shown in FIG. 5 to FIG. 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 be closed by the cylinder part 12 . A part of the end face of one end of the center of the connecting rod 4 is concavely formed toward the 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 peripheral wall and the outer peripheral wall of the cylinder portion 12, so that The oil guide groove 121 is connected to the cylinder hole 120, so that the oil sprinkled on the oil guide groove 121 can flow into the cylinder hole 120 during the operation of the pump body assembly 100, and the piston 2 is arranged in the cylinder hole 120, so the oil at the oil guide groove 121 can flow into the cylinder hole 120. The oil can flow between the cylinder hole 120 and the piston 2 to lubricate the moving pair formed by the cylinder part 12 and the piston 2; the outer peripheral wall of the piston 2 is formed with an annular groove 21 extending along the circumference of the cylinder hole 120. The annular groove 21 can be formed by concave part of the outer peripheral wall of the piston 2, and the first through hole 22 on the piston 2 for penetrating the piston pin 20 is communicated with the annular groove 21, so that during the operation of the pump body assembly 100, the piston 2 is in the cylinder bore. 120 reciprocates, the annular groove 21 can move to a position that communicates 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 the position that matches the cylinder bore 120, The lubricating 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 rotating pair formed by the piston pin 20 and the first end portion 41 .

As shown in FIGS. 4-6 , the piston 2 also has a second through hole 24 , and the second through hole 24 is perpendicular to the first through hole 22 , that is, the center axis of the second through hole 24 is perpendicular to the center axis of the first through hole 22 , and the second through hole 24 is perpendicular to the center axis of the first through hole 22 . The stopper 5 is pierced through the through hole 24 . Since the second through hole 24 is communicated with the first through hole 22 , when the stopper 5 is inserted through the second through hole 24 , it is convenient for the stopper 5 to pass through the piston pin 20 to limit the piston. The axial movement of the pin 20 realizes the limitation of the piston pin 20 , preventing the piston pin 20 from separating from the first through hole 22 and causing the first end 41 to disengage from the piston 2 , 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 rapid penetration of the piston pin 20 into the first through hole 22, which improves the assembly efficiency of the pump body assembly 100; the limiter 5 can be optionally an elastic pin, but not limited to this.

In some specific embodiments of the present invention, as shown in FIG. 6 , the diameter of the main shaft part 31 is D1, and the diameter of the auxiliary shaft part 32 is d1, which satisfies: 1.1≤D1/d1≤1.5, and the diameter of the main shaft part 31 is the same as that of the auxiliary shaft part 31. There is an appropriate proportional relationship between the diameters of the shaft portions 32, and both the main shaft portion 31 and the auxiliary shaft portion 32 have good reliability in use, so that the crankshaft 3 is stable in structure, reliable in use, flexible in design, and easy to ensure the dynamic balance of the crankshaft 3. In addition, it is avoided that D1/d1 is too large, so that the difference between the main shaft part 31 and the auxiliary shaft part 32 is large, which causes the structure of the crankshaft 3 to be easily deformed; Box 1 and link 4 fit better.

In some specific embodiments of the present invention, as shown in FIG. 6 and FIG. 12 , the diameter of the first hole 411 is d2, and the diameter of the second hole 421 is D2, satisfying: 1.5≤D2/d2≤2.5, the first hole There is an appropriate proportional relationship between the diameter of 411 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, flexible in design, and avoids that D2/d2 is too large to make the first end 41 and the second end 41. The difference between the parts 42 is large, which leads to the easy deformation of the structure of the connecting rod 4, and avoids that the D2/d2 is too small, so that the difference between the first end 41 and the second end 42 is too small to be better than the piston pin 20 and the countershaft part 32. Cooperate.

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

Wherein, if the fitting clearance y between the first end portion 41 and the fitting groove 23 satisfies: 0.2mm≤y≤0.6mm, then there is an appropriate fitting clearance between the first end portion 41 and the fitting groove 23, so as to ensure the first end portion 41 On the premise of the assembly efficiency 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 41 is avoided in the process that the crankshaft 3 drives the connecting rod 4 to operate. The one end portion 41 generates relatively large shaking relative to the piston 2, thereby reducing the vibration of the pump body assembly 100 and reducing the running noise.

As shown in FIG. 5 , in the direction perpendicular to the axis of the piston pin 20 , the maximum width of the matching groove 23 is greater than the maximum width of the first end portion 41 , so as to avoid the connecting rod 4 and the piston 2 during the operation of the pump body assembly 100 . The 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 invention includes the pump body assembly 100 for the reciprocating compressor 200 according to the embodiment of the first aspect of the present invention.

For example, as shown in FIGS. 1-3 , the reciprocating compressor 200 includes a stator 101 and a rotor, the rotor is sleeved in the stator 101 and the rotor is in an interference fit with the crankshaft 3 , and the crankcase 1 passes through the first stator mounting feet 113 and The second stator mounting feet 114 are mounted 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 portion 12 . The reciprocating motion 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 invention, by using the pump body assembly 100 described above, the structural stability and reliability of the reciprocating compressor 200 during assembly and operation are improved.

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

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Rear, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Axial, Radial, Circumferential The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, a specific orientation, and a specific orientation. The orientation configuration and operation are therefore not to be construed as limitations of the present invention. In the description of the present invention, "plurality" means two or more.

In the description of this specification, reference to the terms "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples", etc., is meant to incorporate the embodiments A particular feature, structure, material, or characteristic described by an example or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, The scope of the invention is defined by the claims and their equivalents.

Claims (12)

1. A pump body assembly for a reciprocating compressor, comprising:

the crankcase comprises a body part and a cylinder part, wherein a crankshaft hole with an axis extending along the vertical direction is formed in the body part, and the cylinder part is arranged at the top of the body part and defines a cylinder hole with an axis extending along the transverse direction;

the piston is arranged in the cylinder hole, and a piston pin with an axis extending along the vertical direction penetrates through the piston;

the crankshaft comprises a main shaft part and an auxiliary shaft part, the main shaft part is arranged in the crankshaft hole in a penetrating mode, the auxiliary shaft part is connected with the upper end of the main shaft part and is parallel to the main shaft part, and the auxiliary shaft part is positioned above the body part;

a connecting rod disposed above the body portion and including a first end portion defining a first bore that is nested outside the wrist pin and a second end portion defining a second bore that is nested outside the secondary shaft portion, wherein the crankcase has a first plane that passes through a center axis of the cylinder bore and is perpendicular to a center axis of the crankshaft bore, and the connecting rod has a second plane that passes through a center of the first bore and a center of the second bore and is perpendicular to both the center axis of the first bore and a center axis of the second bore, the first plane being parallel to or coincident with the second plane.

2. The pump body assembly for a reciprocating compressor of claim 1, wherein the body portion includes a first portion and a second portion on both sides of the diameter of the crank bore, the cylinder portion is provided on a top of the first portion, a bottom of the first portion has two first stator mounting legs, and a bottom of the second portion has one second stator mounting leg.

3. The pump body assembly for a reciprocating compressor according to claim 1, wherein when the first plane is parallel to the second plane, a distance between the first plane and the second plane is less than or equal to 1 mm.

4. The pump body assembly for a reciprocating compressor of claim 2, wherein a line L1 connecting the two first stator mounting legs is perpendicular to a line L2 connecting the second stator mounting leg and the crank hole, projected in an axial direction of the crank hole.

5. The pump body assembly for a reciprocating compressor of claim 2, wherein a line connecting one of the first stator mounting legs and the crank hole is L3, a line connecting the other first stator mounting leg and the crank hole is L4, and an included angle between L3 and L4 is an acute angle or a right angle, as projected in an axial direction of the crank hole.

6. The pump body assembly for a reciprocating compressor according to any one of claims 1 to 5, wherein a first oil storage chamber having an open bottom is formed in the main shaft portion, a first oil groove is formed on an outer peripheral wall of the main shaft portion, a first oil hole and an air bubble hole communicating with the first oil storage chamber are formed on the main shaft portion, the first oil hole is outwardly penetrated to communicate with the first oil groove, and the air bubble hole is outwardly penetrated to the outer peripheral wall of the main shaft portion and spaced apart from the first oil groove.

7. The pump body assembly for a reciprocating compressor according to claim 6, wherein a second oil storage chamber is formed in the auxiliary shaft portion, a communication passage communicating the first oil storage chamber and the second oil storage chamber is formed in the crankshaft, a second oil hole communicating with the second oil storage chamber is formed in the auxiliary shaft portion, and the second oil hole is outwardly perforated to an outer peripheral wall of the auxiliary shaft portion.

8. The pump body assembly for a reciprocating compressor according to claim 7, wherein a second oil groove is formed on an outer circumferential wall of the auxiliary shaft portion, the second oil groove communicating with the second oil hole.

9. The pump body assembly for a reciprocating compressor according to claim 1, wherein the diameter of the main shaft portion is D1 and the diameter of the auxiliary shaft portion is D1, satisfying: D1/D1 is more than or equal to 1.1 and less than or equal to 1.5.

10. The pump body assembly for a reciprocating compressor according to claim 1, characterized in that said first hole has a diameter D2 and said second hole has a diameter D2, satisfying: D2/D2 is more than or equal to 1.5 and less than or equal to 2.5.

11. The pump body assembly for a reciprocating compressor according to claim 1, wherein a height H of the first end portion is an axial length of the first bore, the piston is formed with a fitting groove for receiving the first end portion, the fitting groove has a height H in an axial direction of the piston pin, wherein H < H, and a fitting clearance y of the first end portion and the fitting groove satisfies: y is more than or equal to 0.2mm and less than or equal to 0.6 mm.

12. A reciprocating compressor, characterized by comprising a pump body assembly for a reciprocating compressor according to any one of claims 1 to 11.

Images