Compressor and refrigeration equipment

Abstract

The utility model discloses a compressor and refrigeration equipment, the compressor comprises a crankcase, a piston, a crankshaft and a connecting rod, the crankcase is provided with a shaft hole and a compression cavity; the piston is slidably mounted in the compression cavity; the crankshaft is rotationally mounted in the shaft hole and provided with an eccentric part; the connecting rod comprises a rod body, a first connecting part and a second connecting part, the first connecting part is hinged to the eccentric part, and the second connecting part is hinged to the piston; the axial center face of the first connecting part is a first center face, the axial center face of the second connecting part is a second center face, the center face, in the direction parallel to the rotating axis of the crankshaft, of the rod body is a third center face, the third center face is located above the first center face, and the third center face is located above the second center face. According to the compressor, the flexibility of the connecting rod can be improved, the stress distribution between the connecting rod and the eccentric part of the crankshaft is optimized, the abrasion between the connecting rod and the eccentric part is reduced, and the reliability of the compressor is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a compressor technical field, especially a kind of compressor and refrigeration equipment. BACKGROUND

[0002] During the operation of reciprocating compressor, the crankshaft drives the piston to reciprocate in the compression chamber of the cylinder through the connecting rod, so as to compress the refrigerant and do work. As a key transmission component in the compressor, the connecting rod is subjected to the force of the refrigerant acting on the piston through the connecting rod during the reciprocating movement of the piston, which causes the eccentric part of the crankshaft to bend and deform in the direction away from the piston. The contact pressure between the lower end of the eccentric part on the side close to the piston and the connecting rod is too large, the oil film thickness at this point is reduced, and the wear between the connecting rod and the eccentric part is increased, which reduces the reliability of the compressor. SUMMARY

[0003] The utility model aims at at least one of the technical problems existing in the prior art. To this end, the utility model provides a compressor, which can increase the flexibility of the connecting rod, optimize the stress distribution between the connecting rod and the eccentric part of the crankshaft, thereby reducing the wear between the connecting rod and the eccentric part and improving the reliability of the compressor.

[0004] The utility model also provides a refrigeration equipment with the above-mentioned compressor.

[0005] According to the compressor of the first aspect of the utility model, the crankcase comprises a body part and a cylinder part, the body part is provided with a shaft hole, the cylinder part is connected to the body part along the radial side of the shaft hole, and the cylinder part is provided with a compression chamber. The piston is slidably installed in the compression chamber. The crankshaft is arranged in the shaft hole and rotationally connected with the body part. The upper end of the crankshaft is provided with an eccentric part. The connecting rod comprises a rod body and first and second connecting parts connected to the two ends of the rod body. The first connecting part is hingedly connected with the eccentric part, and the second connecting part is hingedly connected with the piston. The axial center surface of the first connecting part is the first center surface, the axial center surface of the second connecting part is the second center surface, and the center surface of the rod body in the direction parallel to the rotation axis of the crankshaft is the third center surface. The third center surface is located above the first center surface, and the third center surface is located above the second center surface.

[0006] According to the compressor of the first aspect of the present application, the third central surface of the rod body is arranged above the first central surface of the first connecting part and the second central surface of the second connecting part, that is, the rod body is upwardly offset relative to the first connecting part and the second connecting part, so that the first connecting part is more likely to be self-adaptively deformed with the eccentric part when the first connecting part is under stress, that is, the flexibility of the connecting rod is increased. Therefore, on the one hand, when the eccentric part is deformed in the direction away from the piston under the action of the refrigerant on the piston, the first connecting part can be deformed in the direction of the eccentric part, so that the contact area between the eccentric part and the first connecting part is increased, the surface pressure is reduced, the minimum oil film thickness is increased, the lubricity between the first connecting part and the eccentric part is improved, and the wear is reduced; on the other hand, since the rod body is upwardly offset relative to the first connecting part and the second connecting part, the force applied by the connecting rod to the eccentric part is upwardly transferred, avoiding the position of the lower end of the side of the eccentric part close to the piston, so that the contact pressure between the lower end of the side of the eccentric part close to the piston and the first connecting part is reduced, and the distribution of the stress of the eccentric part in the axial direction of the crankshaft is optimized, further reducing the wear, and effectively improving the reliability of the compressor.

[0007] According to some embodiments of the present application, in the direction of the rotation axis, the end surfaces of the two ends of the rod body are located between the end surfaces of the two ends of the first connecting part, and the distance between the upper end surface of the rod body and the upper end surface of the first connecting part is less than the distance between the lower end surface of the rod body and the lower end surface of the first connecting part, the distance between the lower end surface of the rod body and the lower end surface of the first connecting part is H1, and satisfies: 1.5mm≤H1≤5mm.

[0008] According to some embodiments of the present application, in the direction of the rotation axis, the end surfaces of the two ends of the rod body are located between the end surfaces of the two ends of the second connecting part, and the distance between the upper end surface of the rod body and the upper end surface of the second connecting part is less than the distance between the lower end surface of the rod body and the lower end surface of the second connecting part, the distance between the lower end surface of the rod body and the lower end surface of the second connecting part is H2, and satisfies: 1.5mm≤H2≤4.5mm.

[0009] According to some embodiments of the present application, the rod body comprises a transition section and a straight rod section connected to each other, the transition section is connected to the first connecting part, the straight rod section is connected to the second connecting part, and the width of the transition section decreases from the direction of the first connecting part to the second connecting part, the transition section is provided with a through hole, and the through hole penetrates the end surfaces of the two ends of the transition section in the direction of the rotation axis.

[0010] According to some embodiments of the present application, the inner contour of the through hole is circular, elliptical or polygonal.

[0011] According to some embodiments of the utility model, the inner contour of the through hole is trapezoidal, and the large end of the trapezoidal shape faces the first connecting part, the two waists of the trapezoidal shape are respectively parallel to the two side wall surfaces of the transition section facing away from each other in the width direction, and the minimum distance between the two side wall surfaces of the transition section facing away from each other in the width direction and the inner circumferential wall of the through hole is D1, satisfying: 1mm≤D1≤4mm.

[0012] According to some embodiments of the utility model, the two adjacent wall surfaces in the inner circumferential wall of the through hole are connected through a fillet transition, the radius of the fillet is R, satisfying: 0.2mm≤R≤1mm.

[0013] According to some embodiments of the utility model, the first connecting part is provided with a first connecting hole, the eccentric part is arranged in the first connecting hole, and the minimum distance between the inner circumferential wall of the through hole and the inner circumferential wall of the first connecting hole is D2, satisfying: 1mm≤D2≤5mm.

[0014] According to some embodiments of the utility model, the distance between the center of the first connecting hole and the center of the through hole is S, satisfying: 10mm≤S≤15mm.

[0015] According to the refrigeration equipment of the second aspect of the utility model, the compressor of the first aspect of the utility model is included.

[0016] According to the refrigeration equipment of the second aspect of the utility model, at least the following beneficial effects are achieved: since the compressor is used, the third center surface of the rod body is arranged above the first center surface of the first connecting part and the second center surface of the second connecting part, that is, the rod body is upwardly offset relative to the first connecting part and the second connecting part, so that the first connecting part is more likely to be self-adaptively deformed with the eccentric part when being stressed, that is, the flexibility of the connecting rod is increased. Therefore, on the one hand, when the eccentric part is curved and deformed in the direction away from the piston under the action of the refrigerant on the piston, the first connecting part can be curved and deformed along the eccentric part, so as to increase the contact area between the eccentric part and the first connecting part, reduce the surface pressure, increase the minimum oil film thickness, improve the lubricity between the first connecting part and the eccentric part, and reduce the wear; on the other hand, since the rod body is upwardly offset relative to the first connecting part and the second connecting part, the action force of the connecting rod on the eccentric part is upwardly transferred, avoiding the position of the lower end of the side of the eccentric part close to the piston, so that the contact pressure between the lower end of the side of the eccentric part close to the piston and the first connecting part is reduced, and the distribution of the stress of the eccentric part in the axial direction of the crankshaft is optimized, further reducing the wear, and effectively improving the reliability of the compressor.

[0017] Additional aspects and advantages of the utility model will be partially given in the following description, some will become apparent from the following description, or will be understood by the practice of the utility model. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0019] Figure 1 This is a cross-sectional view of the internal structure of the compressor in an embodiment of this utility model;

[0020] Figure 2 yes Figure 1 Enlarged view of point A in the image;

[0021] Figure 3 This is a top view of the connecting rod when the through hole is trapezoidal in some embodiments of this utility model;

[0022] Figure 4 yes Figure 3 The front sectional view of the connecting rod is shown.

[0023] Figure 5 This is a top view of the connecting rod when the through hole is triangular in some embodiments of this utility model;

[0024] Figure 6 This is a top view of the connecting rod when the through hole is circular in some embodiments of this utility model;

[0025] Figure 7 This is a top view of the connecting rod when the through hole is hexagonal in some embodiments of this utility model;

[0026] Figure 8 This is a simulation diagram of the contact pressure distribution on the inner peripheral wall of the first connecting hole in the prior art;

[0027] Figure 9 This is a simulation diagram of the total pressure distribution on the inner circumferential wall of the first connecting hole in the prior art;

[0028] Figure 10 This is a simulation diagram of the contact pressure distribution on the inner peripheral wall of the first connecting hole in some embodiments of this utility model;

[0029] Figure 11 This is a simulation diagram of the total pressure distribution on the inner peripheral wall of the first connecting hole in some embodiments of this utility model.

[0030] Figure label:

[0031] Crankcase 100; Body 110; Shaft bore 111; Cylinder section 120; Compression chamber 121;

[0032] Piston 200; Pin hole 210; Shaft pin 220;

[0033] Crankshaft 300; Main shaft 310; Bearing section 320; Eccentric section 330;

[0034] Connecting rod 400; rod body 410; transition section 411; through hole 4111; rounded corner 4112; straight rod section 412; third center plane 413; third line segment 414; first connecting portion 420; first connecting hole 421; first center plane 422; first line segment 423; second connecting portion 430; second connecting hole 431; second center plane 432; second line segment 433;

[0035] Rotation axis Z. DETAILED DESCRIPTION

[0036] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, and are used only for explaining the present application, and cannot be understood as a limitation of the present application.

[0037] In the description of the present application, it should be understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application.

[0038] In the description of the present application, the meaning of several is one or more, and the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, and above, below, etc. are understood as including the number. If it is described as first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0039] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, assembling, cooperating, etc. should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0040] During the operation of the reciprocating compressor, the crankshaft drives the piston to reciprocate in the compression chamber of the cylinder through the connecting rod, so as to realize the compression work of the refrigerant. When the piston is in the compression stroke, the pressure of the refrigerant is relatively large, the refrigerant exerts a reaction force on the piston, and the force exerted by the refrigerant on the piston acts on the crankshaft through the connecting rod, which will cause the eccentric part of the crankshaft to bend and deform in the direction away from the piston.

[0041] In related technologies, due to the high rigidity of the connecting rod, the structure connecting the connecting rod to the eccentric part does not bend or deform with the bending deformation of the eccentric part. This causes the contact between the eccentric part and the connecting rod to change from surface contact to point or line contact. Furthermore, the contact positions between the eccentric part and the connecting rod are the lower end of the eccentric part closer to the piston and the upper end of the eccentric part farther from the piston. Since the direction of the force applied by the connecting rod to the eccentric part is from the piston to the eccentric part, the contact pressure at the lower end of the eccentric part closer to the piston is higher, and this lower end of the eccentric part closer to the piston is a position prone to wear. This results in a reduction in the oil film thickness at the lower end of the eccentric part closer to the piston, accelerated wear, and a decrease in the reliability of the compressor.

[0042] Therefore, referring to Figures 1 to 7 As shown, the first aspect of this utility model provides a compressor applied to refrigeration equipment, such as refrigerators or freezers.

[0043] Reference Figure 1 As shown, it can be understood that the compressor includes a housing and a crankcase 100, piston 200, crankshaft 300 and connecting rod 400 disposed within the housing. Specifically, the crankcase 100 includes a body portion 110 and a cylinder portion 120. The body portion 110 is generally a rectangular platform structure and is arranged in a horizontal direction. The body portion 110 is connected to the bottom of the housing through a shock-absorbing component (such as a spring, elastic seat, etc.). A shaft hole 111 is provided in the middle of the body portion 110, and the shaft hole 111 penetrates the end faces of both ends of the body portion 110 in a vertical direction.

[0044] Reference Figure 1 As shown, the cylinder section 120 is connected to the body section 110 and is an integral part of the body section 110. The cylinder section 120 is located at one end of the body section 110 along the radial direction of the shaft hole 111. Specifically, the cylinder section 120 is connected to the upper end face of the front end of the body section 110. The cylinder section 120 is provided with a compression chamber 121, which extends through the end faces of both ends of the cylinder section 120 in the front-rear direction. Generally, a valve plate assembly and a cylinder head are sequentially installed at the end of the cylinder section 120 opposite to the shaft hole 111. The valve plate assembly is provided with an exhaust port, and the cylinder head is provided with an exhaust chamber, which is connected to the compression chamber 121 through the exhaust port.

[0045] Reference Figure 1As shown, it can be understood that the piston 200 is slidingly installed in the compression chamber 121 along the front-rear direction, and generally, the outer peripheral wall of the front portion of the piston 200 is sealingly matched with the inner peripheral wall of the compression chamber 121 to ensure the sealing between the piston 200 and the compression chamber 121 to avoid leakage during the compression of the refrigerant. The rear portion of the piston 200 is a guide structure to accurately guide the piston 200 to move in the compression chamber 121 along the front-rear direction. The piston 200 is further provided with an annular groove which is arranged between the front portion and the rear portion of the piston 200 along the circumferential direction of the piston 200, and the annular groove can store a certain amount of lubricating oil to meet the lubricating performance between the piston 200 and the compression chamber 121.

[0046] Referring to Figure 1 As shown, it can be understood that the crankshaft 300 is penetratingly arranged in the shaft hole 111 and is rotationally matched with the body portion 110. Specifically, the crankshaft 300 includes a main shaft 310, a bearing portion 320 and an eccentric portion 330, wherein the main shaft 310 is arranged along the up-down direction, the bearing portion 320 is substantially a plate-like structure, the bearing portion 320 is connected to the upper end of the main shaft 310, and the bearing portion 320 protrudes from the outer peripheral wall of the main shaft 310 along the radial direction of the main shaft 310, the eccentric portion 330 is a cylindrical structure and is arranged along the up-down direction, the eccentric portion 330 is connected to the upper end of the bearing portion 320, and the central axis of the eccentric portion 330 deviates from the central axis of the main shaft 310, and the central axis of the eccentric portion 330 is parallel to the central axis of the main shaft 310. The main shaft 310 penetrates the shaft hole 111 from top to bottom and is rotationally matched with the body portion 110, the bearing portion 320 and the eccentric portion 330 are located above the body portion 110, and a plane bearing is arranged between the bearing portion 320 and the body portion 110 to provide upward support for the crankshaft 300 through the plane bearing and ensure the stable rotation of the crankshaft 300. It can be easily understood that during the operation of the compressor, the crankshaft 300 rotates around the central axis of the main shaft 310, that is, the rotation axis Z of the crankshaft 300 coincides with the central axis of the main shaft 310.

[0047] It can be understood that the compressor further includes a motor assembly which is installed below the body portion 110. Specifically, the motor assembly includes a stator and a rotor, the stator is fixedly connected with the body portion 110, and the rotor is fixedly connected with the main shaft 310 and is rotationally installed in the inner hole of the stator. Therefore, during the operation of the compressor, the motor assembly can drive the crankshaft 300 to rotate around the central axis of the main shaft 310.

[0048] Referring to Figure 1 and Figure 3As shown, it can be understood that the connecting rod 400 is connected between the piston 200 and the crankshaft 300. Specifically, the connecting rod 400 comprises a rod body 410, a first connecting portion 420 and a second connecting portion 430, and the first connecting portion 420 and the second connecting portion 430 are connected to two ends of the rod body 410 respectively. The rod body 410 is arranged along the front-rear direction, the first connecting portion 420 is connected to the rear end of the rod body 410, that is, the first connecting portion 420 is connected to one end of the rod body 410 close to the crankshaft 300, and the second connecting portion 430 is connected to the front end of the rod body 410, that is, the second connecting portion 430 is connected to one end of the rod body 410 close to the piston 200. The first connecting portion 420, the second connecting portion 430 and the rod body 410 are of an integral structure.

[0049] Referring to Figure 3 As shown, it can be understood that the first connecting portion 420 is provided with a first connecting hole 421, the first connecting hole 421 penetrates the end faces of the two ends of the first connecting portion 420 along the up-down direction, and the central axis of the first connecting hole 421 is arranged along the up-down direction. Similarly, the second connecting portion 430 is provided with a second connecting hole 431, the second connecting hole 431 penetrates the end faces of the two ends of the second connecting portion 430 along the up-down direction, and the central axis of the second connecting hole 431 is arranged along the up-down direction. That is, the first connecting portion 420 and the second connecting portion 430 are both substantially sleeve structures.

[0050] Referring to Figure 1 and Figure 3 As shown, it can be understood that the eccentric portion 330 is arranged in the first connecting hole 421 from bottom to top, and the eccentric portion 330 is rotationally fitted with the first connecting portion 420, that is, the first connecting portion 420 is hinged with the eccentric portion 330, and the hinge axis of the first connecting portion 420 and the eccentric portion 330 is parallel to the rotation axis Z of the crankshaft 300.

[0051] Referring to Figure 1 As shown, it can be understood that the piston 200 is provided with a pin hole 210, and the pin hole 210 is arranged along the up-down direction. A shaft pin 220 is connected between the piston 200 and the second connecting portion 430, the shaft pin 220 is arranged in the pin hole 210 and the second connecting hole 431, and the shaft pin 220 is rotationally fitted with at least one of the piston 200 and the second connecting portion 430. In this embodiment, the shaft pin 220 is rotationally fitted with the piston 200, and the shaft pin 220 is rotationally fitted with the second connecting portion 430. Therefore, the second connecting portion 430 is hinged with the piston 200, and the hinge axis of the second connecting portion 430 and the piston 200 is parallel to the rotation axis Z of the crankshaft 300. That is, the hinge axes of the first connecting portion 420 and the eccentric portion 330 and the second connecting portion 430 and the piston 200 are parallel. Therefore, when the motor assembly drives the crankshaft 300 to rotate, the crankshaft 300 can drive the piston 200 to reciprocate in the compression chamber 121 through the connecting rod 400, so as to realize compression work on the refrigerant.

[0052] Reference Figure 4 As shown, it can be understood that the axial center plane of the first connecting portion 420 is the first center plane 422. Specifically, the central axis of the first connecting hole 421 intersects the upper end face and the lower end face of the first connecting portion 420 respectively to form a first line segment 423 located between the upper end face and the lower end face of the first connecting portion 420. The plane passing through the midpoint of the first line segment 423 and perpendicular to the central axis of the first connecting hole 421 is the axial center plane of the first connecting portion 420, that is, the first center plane 422.

[0053] Reference Figure 4 As shown, it can be understood that the axial center plane of the second connecting portion 430 is the second center plane 432. Specifically, the central axis of the second connecting hole 431 intersects the upper end face and the lower end face of the second connecting portion 430 respectively to form a second line segment 433 located between the upper end face and the lower end face of the second connecting portion 430. The plane passing through the midpoint of the second line segment 433 and perpendicular to the central axis of the second connecting hole 431 is the axial center plane of the second connecting portion 430, that is, the second center plane 432.

[0054] Reference Figure 4 As shown, it can be understood that the center surface of the rod 410 along the direction parallel to the rotation axis Z of the crankshaft 300 is the third center surface 413. Specifically, reference lines arranged along the rotation axis Z of the crankshaft 300 intersect the upper and lower end surfaces of the rod 410 to form a third line segment 414 located between the upper and lower end surfaces of the rod 410. The plane passing through the midpoint of the third line segment 414 and perpendicular to the rotation axis Z of the crankshaft 300 is the center surface of the rod 410, i.e., the third center surface 413.

[0055] Reference Figure 4 As shown, it can be understood that, generally speaking, in order to reduce the weight of the connecting rod 400, the thickness of the rod body 410 is less than the height of the first connecting portion 420 and less than the height of the second connecting portion 430 along the rotation axis Z of the crankshaft 300. The thickness of the rod body 410 is the distance between the upper and lower end faces of the rod body 410 in the direction of the rotation axis Z of the crankshaft 300. The height of the first connecting portion 420 is the distance between the upper and lower end faces of the first connecting portion 420 in the direction of the rotation axis Z of the crankshaft 300. The height of the second connecting portion 430 is the distance between the upper and lower end faces of the second connecting portion 430 in the direction of the rotation axis Z of the crankshaft 300.

[0056] Reference Figure 4As shown, it can be understood that the third center plane 413 is located above the first center plane 422, and the third center plane 413 is located above the second center plane 432. That is, the rod body 410 is upwardly biased relative to the first connecting portion 420 and the second connecting portion 430. Therefore, under the force state, the connecting rod 400 is prone to bending deformation, and when the connecting rod 400 is bent and deformed, the lower end of the first connecting portion 420 and the lower end of the second connecting portion 430 are close to each other in the length direction of the rod body 410, and the upper end of the first connecting portion 420 and the upper end of the second connecting portion 430 are away from each other in the length direction of the rod body 410. That is, the flexibility of the connecting rod 400 is increased. It is easy to understand that the bending deformation amount of the connecting rod 400 is small, which does not affect the function of the connecting rod 400 for realizing the transmission between the crankshaft 300 and the piston 200.

[0057] Referring to Figure 4 As shown, it can be understood that in the embodiment, the upper end face of the rod body 410 is located below the upper end face of the first connecting portion 420 and the upper end face of the second connecting portion 430, and the lower end face of the rod body 410 is located above the lower end face of the first connecting portion 420 and the lower end face of the second connecting portion 430. That is, in the direction of the rotation axis Z of the crankshaft 300, the end faces of the two ends of the rod body 410 are located between the end faces of the two ends of the first connecting portion 420, and the end faces of the two ends of the rod body 410 are located between the end faces of the two ends of the second connecting portion 430. At the same time, the distance between the upper end face of the rod body 410 and the upper end face of the first connecting portion 420 is less than the distance between the lower end face of the rod body 410 and the lower end face of the first connecting portion 420, so that the rod body 410 is upwardly biased relative to the first connecting portion 420. Similarly, the distance between the upper end face of the rod body 410 and the upper end face of the second connecting portion 430 is less than the distance between the lower end face of the rod body 410 and the lower end face of the second connecting portion 430, so that the rod body 410 is upwardly biased relative to the second connecting portion 430. Thus, the flexibility of the connecting rod 400 is reduced.

[0058] Therefore, when the piston 200 is in the compression stroke during the operation of the compressor, the eccentric portion 330 is bent and deformed in the direction away from the piston 200 under the action of the refrigerant on the piston 200, that is, the central axis of the eccentric portion 330 is inclinedly arranged at this time, and the upper end of the central axis of the eccentric portion 330 is offset in the direction away from the piston 200. Due to the increase in the flexibility of the connecting rod 400, the first connecting portion 420 can be adaptively deformed with the eccentric portion 330, that is, the first connecting portion 420 is bent and deformed following the bending and deformation of the eccentric portion 330, thereby increasing the contact area between the eccentric portion 330 and the inner circumferential wall of the first connecting hole 421, that is, increasing the contact area between the eccentric portion 330 and the first connecting portion 420, effectively reducing the surface pressure, that is, reducing the contact pressure between the outer circumferential wall of the eccentric portion 330 and the inner circumferential wall of the first connecting hole 421, realizing the increase in the minimum oil film thickness, and further improving the lubricity between the eccentric portion 330 and the first connecting portion 420, and reducing the wear between the eccentric portion 330 and the first connecting portion 420.

[0059] Referring to Figure 1 and Figure 2 It can be easily understood that the contact position between the eccentric portion 330 and the first connecting portion 420 at this time is still the lower part of the outer circumferential wall of the eccentric portion 330 near the piston 200 and the upper part of the outer circumferential wall of the eccentric portion 330 away from the piston 200, and the lower part of the outer circumferential wall of the eccentric portion 330 near the piston 200 is the easy-wear position, which is Q in Figure 2 Due to the upward bias of the rod body 410 relative to the first connecting portion 420 and the second connecting portion 430, the action force of the connecting rod 400 on the eccentric portion 330 is transferred upward, so that the action force of the connecting rod 400 on the eccentric portion 330 is further away from the lower part of the outer circumferential wall of the eccentric portion 330 near the piston 200, thereby reducing the contact pressure between the lower part of the outer circumferential wall of the eccentric portion 330 near the piston 200 and the inner circumferential wall of the first connecting hole 421, that is, reducing the contact pressure of the easy-wear position between the eccentric portion 330 and the first connecting portion 420, which is beneficial to further reducing the wear between the eccentric portion 330 and the first connecting portion 420, and optimizing the distribution of the total stress of the eccentric portion 330 in the axial direction of the crankshaft 300 (that is, the direction of the rotation axis Z), which is beneficial to further reducing the wear, and further effectively improving the reliability of the compressor.

[0060] Referring to Figure 8 and Figure 9 It can be easily understood that the contact position between the eccentric portion 330 and the first connecting portion 420 at this time is still the lower part of the outer circumferential wall of the eccentric portion 330 near the piston 200 and the upper part of the outer circumferential wall of the eccentric portion 330 away from the piston 200, and the lower part of the outer circumferential wall of the eccentric portion 330 near the piston 200 is the easy-wear position, which is Q in Figure 8 shows the contact pressure distribution diagram of the inner circumferential wall of the first connecting hole 421 in the prior art, wherein the vertical coordinate corresponds to the position of the first connecting hole 421 along the central axis, and the horizontal coordinate corresponds to the circumferential position of the first connecting hole 421, and the positions of 0° and 360° are the positions of the end of the first connecting hole 421 near the piston 200. Similarly,Figure 9 A total pressure distribution diagram of the inner peripheral wall of the first connecting hole 421 in the prior art is shown, the total pressure being the sum of the contact pressure and the reaction force exerted on the connecting rod 400 by the piston 200. Figure 10 A contact pressure distribution diagram of the inner peripheral wall of the first connecting hole 421 in the present embodiment is shown, Figure 11 A total pressure distribution diagram of the inner peripheral wall of the first connecting hole 421 in the present embodiment is shown.

[0061] Referring to Figure 8 It can be understood that, in the prior art, when the piston 200 is in the compression stroke, the position of the maximum contact pressure between the eccentric portion 330 and the first connecting portion 420 is located in the lower part of the inner peripheral wall of the first connecting hole 421 near the side of the piston 200, and according to the principle of action and reaction, the position of the maximum contact pressure is located in the lower part of the outer peripheral wall of the eccentric portion 330 near the side of the piston 200, which will cause the lower parts of the eccentric portion 330 and the first connecting portion 420 to be worn out.

[0062] For comparison, referring to Figure 10 It can be understood that, in the present embodiment, when the piston 200 is in the compression stroke, the position of the maximum contact pressure between the eccentric portion 330 and the first connecting portion 420 is transferred upward and located in the upper part of the inner peripheral wall of the first connecting hole 421 near the side of the piston 200, and according to the principle of action and reaction, the position of the maximum contact pressure is located in the upper part of the outer peripheral wall of the eccentric portion 330 near the side of the piston 200, which makes the force exerted by the connecting rod 400 on the eccentric portion 330 further away from the lower part of the outer peripheral wall of the eccentric portion 330 near the side of the piston 200, thereby reducing the contact pressure between the lower part of the outer peripheral wall of the eccentric portion 330 near the side of the piston 200 and the inner peripheral wall of the first connecting hole 421, i.e. reducing the contact pressure of the easily-worn position between the eccentric portion 330 and the first connecting portion 420, which is conducive to further reducing the wear of the eccentric portion 330 and the first connecting portion 420.

[0063] Referring to Figure 9 It can be understood that, in the prior art, the total pressure of the inner peripheral wall of the first connecting hole 421 is distributed with the upper part being small and the lower part being large, which will cause the lower parts of the eccentric portion 330 and the first connecting portion 420 to be worn out.

[0064] For comparison, referring to Figure 11 It can be understood that, in the present embodiment, the total pressure of the inner peripheral wall of the first connecting hole 421 is distributed with the middle part being large and the upper and lower ends being small, which optimizes the distribution of the total force of the eccentric portion 330 in the axial direction of the crankshaft 300 (i.e. the direction of the rotation axis Z), and is conducive to further reducing wear and thereby effectively improving the reliability of the compressor.

[0065] Referring toFigure 4 As shown in FIG. 4, it can be understood that, in the direction along the rotation axis Z of the crankshaft 300, the distance between the lower end surface of the rod body 410 and the lower end surface of the first connecting portion 420 is defined as H1, and satisfies: 1.5 mm≤H1≤5 mm. It can be easily understood that, under the premise that the height of the first connecting portion 420 and the thickness of the connecting rod 400 are constant, the distance between the third central surface 413 of the rod body 410 and the first central surface 422 of the first connecting portion 420 can be limited by limiting the distance H1 between the lower end surface of the rod body 410 and the lower end surface of the first connecting portion 420. If H1<1.5 mm, the distance between the third central surface 413 and the first central surface 422 is too small, the flexibility of the connecting rod 400 is insufficient, which can cause excessive wear between the eccentric portion 330 and the first connecting portion 420, and affect the reliability of the compressor. If H1>5 mm, the distance between the third central surface 413 and the first central surface 422 is too large, the flexibility of the connecting rod 400 is too large, which can cause large deformation under stress, and affect the function of the connecting rod 400 for realizing the transmission between the crankshaft 300 and the piston 200. Therefore, 1.5 mm≤H1≤5 mm is used to increase the flexibility of the connecting rod 400, reduce the wear between the eccentric portion 330 and the connecting rod 400, and improve the reliability of the compressor under the premise that the function of the connecting rod 400 for realizing the transmission between the crankshaft 300 and the piston 200 is satisfied.

[0066] Referring to Figure 4 As shown in FIG. 4, it can be understood that, in the direction along the rotation axis Z of the crankshaft 300, the distance between the lower end surface of the rod body 410 and the lower end surface of the first connecting portion 420 is defined as H1, and satisfies: 1.5 mm≤H1≤5 mm. It can be easily understood that, under the premise that the height of the first connecting portion 420 and the thickness of the connecting rod 400 are constant, the distance between the third central surface 413 of the rod body 410 and the first central surface 422 of the first connecting portion 420 can be limited by limiting the distance H1 between the lower end surface of the rod body 410 and the lower end surface of the first connecting portion 420. If H1<1.5 mm, the distance between the third central surface 413 and the first central surface 422 is too small, the flexibility of the connecting rod 400 is insufficient, which can cause excessive wear between the eccentric portion 330 and the first connecting portion 420, and affect the reliability of the compressor. If H1>5 mm, the distance between the third central surface 413 and the first central surface 422 is too large, the flexibility of the connecting rod 400 is too large, which can cause large deformation under stress, and affect the function of the connecting rod 400 for realizing the transmission between the crankshaft 300 and the piston 200. Therefore, 1.5 mm≤H1≤5 mm is used to increase the flexibility of the connecting rod 400, reduce the wear between the eccentric portion 330 and the connecting rod 400, and improve the reliability of the compressor under the premise that the function of the connecting rod 400 for realizing the transmission between the crankshaft 300 and the piston 200 is satisfied.

[0067] Referring to Figure 3and Figure 4 As shown in FIG. 4, it can be understood that, in general, the outer diameter of the eccentric part 330 is greater than the outer diameter of the shaft pin 220, and thus the outer diameter of the first connecting part 420 of the connecting rod 400 is greater than the outer diameter of the second connecting part 430. In the embodiment, the rod body 410 includes a transition section 411 and a straight rod section 412 connected to each other, wherein the end of the transition section 411 away from the straight rod section 412 is connected to the first connecting part 420, the end of the straight rod section 412 away from the transition section 411 is connected to the second connecting part 430, and the width of the transition section 411 decreases from the first connecting part 420 to the second connecting part 430, i.e., the distance between the left side surface and the right side surface of the transition section 411 in the left-right direction. That is, the large end of the transition section 411 is connected to the first connecting part 420 with a larger outer diameter, so that the rod body 410 is transitioned from the second connecting part 430 with a smaller outer diameter to the first connecting part 420 with a larger outer diameter, and the connecting area of the rod body 410 and the first connecting part 420 can be increased, thereby improving the connecting strength of the rod body 410 and the first connecting part 420 and ensuring the structural stability of the connecting rod 400.

[0068] Referring to FIG. 4, Figures 3 to 7 As shown in FIG. 4, it can be understood that the transition section 411 is provided with a through hole 4111 penetrating the end faces of the two ends of the transition section 411 in the direction of the rotation axis Z of the crankshaft 300. The inner contour of the through hole 4111 can be circular, elliptical or polygonal, wherein the polygonal can be triangular, rectangular, trapezoidal, pentagonal, hexagonal, etc. By providing the through hole 4111 in the transition section 411, on the one hand, the flexibility of the transition section 411 can be increased, thereby further increasing the flexibility of the connecting rod 400, optimizing the distribution of the total force of the eccentric part 330 in the axial direction of the crankshaft 300 (i.e., the direction of the rotation axis Z), reducing the wear of the eccentric part 330 and the connecting rod 400, and improving the reliability of the compressor. On the other hand, it is beneficial to reduce the weight of the connecting rod 400 and reduce the vibration and noise caused by inertia.

[0069] Referring to FIG. 4, Figure 3 As shown in FIG. 4, it can be understood that in the embodiment, the inner contour of the through hole 4111 is trapezoidal, and the large end of the trapezoid faces the first connecting part 420, and the two waists of the trapezoid are respectively parallel to the two side walls of the transition section 411 away from each other in the width direction. Therefore, the inner contour of the through hole 4111 changes with the outer contour of the transition section 411, which is beneficial to further increase the flexibility of the transition section 411, thereby further increasing the flexibility of the connecting rod 400, reducing the wear of the eccentric part 330 and the connecting rod 400, and improving the reliability of the compressor.

[0070] Referring to Table 1, it can be understood that, compared to the case where the connecting rod 400 does not have a through hole 4111, the transition section 411 with a through hole 4111 has a larger minimum oil film thickness, a smaller contact pressure, and a smaller total pressure. Furthermore, in embodiments where the inner contour of the through hole 4111 is triangular, circular, trapezoidal, and hexagonal, the minimum oil film thickness is the largest, the contact pressure is the smallest, and the total pressure is the smallest when the inner contour of the through hole 4111 is trapezoidal. Therefore, when the inner contour of the through hole 4111 is trapezoidal, the wear between the eccentric portion 330 and the connecting rod 400 can be effectively reduced, improving the reliability of the compressor.

[0071] Table 1. Lubrication simulation results of the friction pair between the eccentric part and the first connecting part.

[0072]

[0073] Reference Figure 3 As shown, it can be understood that the minimum distance between the two opposite side walls of the transition section 411 along the width direction and the inner peripheral wall of the through hole 4111 is defined as D1, satisfying: 1mm≤D1≤4mm. It is easy to understand that the size of D1 affects the structural strength and flexibility of the transition section 411. If D1 < 1mm, the distance between the side of the transition section 411 and the inner peripheral wall of the through hole 4111 is too small, resulting in a decrease in the structural strength of the transition section 411, i.e., a decrease in the structural strength of the connecting rod 400. This leads to a large deformation under stress, affecting the function of the connecting rod 400 in realizing the transmission between the crankshaft 300 and the piston 200, and the small distance makes it difficult to process. If D1 > 4mm, the distance between the side of the transition section 411 and the inner peripheral wall of the through hole 4111 is too large, resulting in insufficient flexibility of the transition section 411, i.e., insufficient flexibility of the connecting rod 400. This leads to excessive wear between the eccentric part 330 and the first connecting part 420, affecting the reliability of the compressor. Therefore, by ensuring that 1mm≤D1≤4mm, while fulfilling the function of connecting rod 400 in transmitting power between crankshaft 300 and piston 200, the flexibility of connecting rod 400 is increased, the wear between eccentric part 330 and connecting rod 400 is reduced, the reliability of compressor is improved, and the machinability is guaranteed.

[0074] Reference Figure 3 As shown, it can be understood that adjacent wall surfaces within the inner periphery of the through hole 4111 are connected by a fillet 4112. The radius of the fillet 4112 is defined as R, satisfying: 0.2mm ≤ R ≤ 1mm. By setting the fillet 4112, the drawback of stress concentration caused by sharp corners in the inner periphery of the through hole 4111 can be avoided, thus preventing cracking during machining. The radius R of the fillet 4112 satisfies 0.2mm ≤ R ≤ 1mm, ensuring both machinability and preventing the fillet 4112 from being too large and affecting the structural strength of the connecting rod 400.

[0075] Reference Figure 3As shown, it can be understood that the minimum distance between the inner peripheral wall of the through hole 4111 and the inner peripheral wall of the first connecting hole 421 is D2, that is, the minimum distance between the inner peripheral wall of the through hole 4111 and the inner peripheral wall of the first connecting hole 421 in the length direction of the rod body 410, which satisfies: 1mm≤D2≤5mm. If D2<1mm, on the one hand, the distance is too small, the processability is poor, and on the other hand, it will lead to the wall thickness of the first connecting part 420 of the sleeve structure being too small, the structural strength is poor, and the transmission function of the connecting rod 400 is affected. If D2>5mm, the flexibility of the transition section 411 is insufficient, that is, the flexibility of the connecting rod 400 is insufficient, which will cause excessive wear between the eccentric part 330 and the first connecting part 420, affecting the reliability of the compressor. Therefore, 1mm≤D2≤5mm is used to increase the flexibility of the connecting rod 400, reduce the wear between the eccentric part 330 and the connecting rod 400, and improve the reliability of the compressor on the premise of ensuring the structural strength and processability of the connecting rod 400.

[0076] Referring to Figure 3 As shown, it can be understood that the distance between the center of the first connecting hole 421 and the center of the through hole 4111 is S, which satisfies: 10mm≤S≤15mm. That is, the position of the through hole 4111 on the transition section 411 is limited. While satisfying 1mm≤D2≤5mm, if S<10mm, the inner diameter of the through hole 4111 is reduced, the minimum distance D1 between the two side wall surfaces of the transition section 411 diverging in the width direction and the inner peripheral wall of the through hole 4111 is increased, the flexibility of the transition section 411 is insufficient, that is, the flexibility of the connecting rod 400 is insufficient, which will cause excessive wear between the eccentric part 330 and the first connecting part 420, affecting the reliability of the compressor. If S>15mm, the inner diameter of the through hole 4111 is increased, the minimum distance D1 between the two side wall surfaces of the transition section 411 diverging in the width direction and the inner peripheral wall of the through hole 4111 is reduced, the structural strength of the transition section 411 is reduced, that is, the structural strength of the connecting rod 400 is reduced, which leads to large deformation under stress, affects the function of the connecting rod 400 for realizing transmission between the crankshaft 300 and the piston 200, and the distance is too small to be processed. Therefore, 10mm≤S≤15mm is used to increase the flexibility of the connecting rod 400, reduce the wear between the eccentric part 330 and the connecting rod 400, improve the reliability of the compressor, and ensure the processability on the premise of meeting the transmission function of the connecting rod 400.

[0077] The refrigeration equipment of the second aspect embodiment of the utility model, including the compressor of the first aspect embodiment of the utility model, the refrigeration equipment here can be a refrigerator, a freezer and the like.

[0078] The refrigeration equipment adopts the compressor of all the technical solutions in the above embodiments, and therefore at least has all the beneficial effects brought by the technical solutions in the above embodiments.

[0079] The utility model embodiment makes the detailed explanation in combination with the drawing, but the utility model is not limited to the above -mentioned embodiment, still can make various changes in the knowledge range that the person skilled in the art has possesses without departing from the utility model's tenet under the precondition that the knowledge range that the person skilled in the art has possesses.

Claims

1. Compressor, characterized in that, The application relates to a piston engine, comprising: a crankcase, comprising a body part provided with a shaft hole and a cylinder part connected to the body part along a radial end of the shaft hole, the cylinder part being provided with a compression chamber; a piston slidingly installed in the compression chamber; a crankshaft penetrating through the shaft hole and rotationally matched with the body part, the upper end of the crankshaft being provided with an eccentric part; a connecting rod, comprising a rod body and first and second connecting parts connected to the two ends of the rod body, the first connecting part being hingedly connected with the eccentric part, the second connecting part being hingedly connected with the piston, the rod body comprising a transition section and a straight rod section connected with each other, the transition section being connected with the first connecting part, the straight rod section being connected with the second connecting part, and the width of the transition section decreasing from the first connecting part to the second connecting part, the transition section being provided with a through hole penetrating through the end faces of the two ends of the transition section along the direction of the rotation axis of the crankshaft; wherein the axial center face of the first connecting part is a first center face, the axial center face of the second connecting part is a second center face, and the center face of the rod body along the direction parallel to the rotation axis of the crankshaft is a third center face, the third center face being located above the first center face and above the second center face.

2. The compressor of claim 1, wherein: In the direction of the rotation axis, the end faces of the two ends of the rod body are located between the end faces of the two ends of the first connecting part, and the distance between the upper end face of the rod body and the upper end face of the first connecting part is smaller than the distance between the lower end face of the rod body and the lower end face of the first connecting part, the distance between the lower end face of the rod body and the lower end face of the first connecting part being H1, and 1.5mm<=H1<=5mm.

3. The compressor of claim 1, wherein: In the direction of the rotation axis, the end faces of the two ends of the rod body are located between the end faces of the two ends of the second connecting part, and the distance between the upper end face of the rod body and the upper end face of the second connecting part is smaller than the distance between the lower end face of the rod body and the lower end face of the second connecting part, the distance between the lower end face of the rod body and the lower end face of the second connecting part being H2, and 1.5mm<=H2<=4.5mm.

4. The compressor of claim 1, wherein: The inner contour of the through hole is circular, elliptical or polygonal.

5. The compressor of claim 4, wherein: The inner contour of the through hole is trapezoidal, the large end of the trapezoid faces the first connecting part, the two waists of the trapezoid are respectively parallel to the two side wall faces of the transition section which are away from each other in the width direction, and the minimum distance between the two side wall faces of the transition section which are away from each other in the width direction and the inner circumferential wall of the through hole is D1, and 1mm<=D1<=4mm.

6. The compressor of claim 5, wherein: The adjacent two wall faces in the inner circumferential wall of the through hole are connected through a round corner transition, the radius of the round corner is R, and 0.2mm<=R<=1mm.

7. The compressor of claim 1, wherein: The first connecting part is provided with a first connecting hole, the eccentric part penetrates through the first connecting hole, and the minimum distance between the inner circumferential wall of the through hole and the inner circumferential wall of the first connecting hole is D2, and 1mm<=D2<=5mm.

8. The compressor of claim 7, wherein: The distance between the center of the first connecting hole and the center of the through hole is S, and 10mm<=S<=15mm.

9. A refrigeration appliance characterised in that, A compressor comprising any one of claims 1 to 8.

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