Pump body assembly, compressor and refrigerator

Abstract

The invention provides a pump body assembly, a compressor and a refrigerator. The pump body assembly comprises an air cylinder base, a connecting base, a crankshaft, a first compression assembly and a second compression assembly. The cylinder seat is at least provided with a first cylinder and a second cylinder, the first cylinder and the second cylinder are arranged on the same side in the horizontal direction, and the center line of the first cylinder is parallel to the center line of the second cylinder; the first compression assembly comprises a first connecting rod and a first piston, the second compression assembly comprises a second connecting rod and a second piston, the connecting base is connected with the crankshaft, the first end of the first connecting rod and the first end of the second connecting rod are rotationally connected with the connecting base, and the second end of the first connecting rod is connected with the first piston. The second end of the second connecting rod is connected with the second piston. The first ends of the two connecting rods are rotationally connected with the connecting base, the two compression assemblies can be arranged in a limited space, the structure of the crankshaft can be simplified by using the connecting base, and assembling is easier.

Description

Technical Field

[0001] The invention belongs to the technical field of refrigerators, and in particular relates to a pump body assembly, a compressor and a refrigerator. Background Art

[0002] A household refrigerator system generally consists of two temperature zones, namely, a refrigerator compartment and a freezer compartment. In a household refrigerator system, a small reciprocating piston compressor is usually used. In the prior art, a refrigerator generally selects an evaporation temperature according to the temperature of the freezer compartment. Since the temperature difference between the refrigerator compartment and the freezer compartment is relatively large, the heat transfer temperature difference in the refrigerator compartment is too large, and the heat transfer efficiency is low. If a traditional single evaporation temperature system is used, the system efficiency will be low, and the single-stage compressor has a problem of excessive pressure ratio. The double-cylinder piston compressor structure disclosed in the prior art requires another set of cylinders, pistons and connecting rods to realize this structure, and two or more cylinders are arranged oppositely, which is not conducive to assembly implementation, or two cylinders are arranged in the vertical direction on the same side, but this structure requires two eccentric parts to be set on the crankshaft component, and it is very difficult to assemble the piston and connecting rod on the cylinder. Summary of the invention

[0003] The present invention provides a pump body assembly, a compressor and a refrigerator, which can solve the technical problem that in the existing double-cylinder piston compressor, two or more cylinders are arranged opposite to each other or two cylinders are arranged in the same side in the vertical direction, which increases the difficulty of assembly.

[0004] The present invention provides a pump body assembly, which includes a cylinder seat, a connecting seat, a crankshaft, and a first compression assembly and a second compression assembly;

[0005] The cylinder seat is provided with at least a first cylinder and a second cylinder, the first cylinder and the second cylinder are arranged on the same side in the horizontal direction, and the center line of the first cylinder and the center line of the second cylinder are parallel to each other; the first compression assembly includes a first connecting rod and a first piston, and the first piston is slidably arranged in the first cylinder; the second compression assembly includes a second connecting rod and a second piston, and the second piston is slidably arranged in the second cylinder;

[0006] The crankshaft is arranged in the cylinder seat, the connecting seat is connected to the crankshaft, the first end of the first connecting rod and the first end of the second connecting rod are rotatably connected to the connecting seat respectively, the second end of the first connecting rod is connected to the first piston, and the second end of the second connecting rod is connected to the second piston.

[0007] In some embodiments, the second end of the first connecting rod is rotatably connected to the first piston, and the second end of the second connecting rod is lockingly engaged with the second piston.

[0008] In some embodiments, the second connecting rod includes a clamping block, which is disposed on the second end of the second connecting rod, and the second piston is provided with a clamping groove, in which the clamping block is embedded.

[0009] In some embodiments, the snap-in groove includes an installation groove and a connecting groove, the installation groove and the connecting groove are opened on the outer peripheral wall of the second piston, the end face of the second piston facing the second connecting rod is the first end face, one end of the connecting groove is connected to the installation groove, and the other end of the connecting groove passes through the first end face, the card block is embedded in the installation groove, and part of the second connecting rod is embedded in the first connecting groove.

[0010] In some embodiments, the connecting seat includes a connecting sleeve, a first flange and a second flange, the connecting sleeve is connected to the crankshaft, the first flange and the second flange are arranged on the outer peripheral wall of the connecting sleeve, the first flange and the second flange are arranged on the same side in the horizontal direction, the first end of the first connecting rod is rotatably connected to the first flange, and the first end of the second connecting rod is rotatably connected to the second flange.

[0011] In some embodiments, a first ring is provided at the first end of the first connecting rod, a first radially inward rotating groove is formed on the outer peripheral wall of the first flange, and the first ring is installed in the first rotating groove; a second ring is provided at the first end of the second connecting rod, a second radially inward rotating groove is formed on the outer peripheral wall of the second flange, and the second ring is installed in the second rotating groove.

[0012] In some embodiments, a first connecting assembly and a second connecting assembly are further included, the first connecting assembly includes a first mounting pin and a first positioning pin, along the axial direction of the crankshaft, the first flange is provided with a first pin hole, the first mounting pin passes through a first collar and is installed in the first pin hole, and the first positioning pin connects the first mounting pin and the first flange;

[0013] The second connecting assembly includes a second mounting pin and a second positioning pin. Along the axial direction of the crankshaft, the second flange is provided with a second pin hole. The second mounting pin passes through a second ring and is installed in the second pin hole. The second positioning pin connects the second mounting pin and the second flange.

[0014] In some embodiments, with the end face of the cylinder seat as the projection surface, the cylinder seat is provided with an axial hole, the crankshaft is vertically installed in the axial hole, the line between the crank center of the crankshaft and the center of the axial hole is the center line, and the length of the center line is R; the center of the axial hole has a first horizontal line, and the angle between the center line and the first horizontal line is α; the connecting seat includes a connecting sleeve, the connecting sleeve is connected to the crankshaft, the line from the center of the connecting sleeve to the center of the first pin hole is the first line, the length of the first line is F1, the line from the center of the connecting sleeve to the center of the second pin hole is the second line, the length of the second line is F2, and the angle between the first line and the second line is θ; the second end of the first connecting rod is provided with a first connecting ring, the distance from the center of the first ring to the center of the first connecting ring is L1, and the distance from the center of the second ring to the second end face of the second connecting rod is L2; ​​the first end face of the first piston and the first end face of the second piston both face the crankshaft, the second end face of the first piston and the second end face of the second piston both face away from the crankshaft, and the first piston The piston is connected to the first connecting rod through a first connecting pin, the vertical distance between the center of the pin shaft hole of the first piston and the second end face of the first piston is a1, and the second piston is provided with a clamping groove, and the vertical distance between the inner wall of the clamping groove and the second end face of the second piston is a2; the first cylinder and the second cylinder are opened on the wall surface of the cylinder seat, and the vertical distance between the center of the shaft hole and the wall surface of the cylinder seat is H; the vertical distance between the center line of the first cylinder and the first horizontal line is e1, and the vertical distance between the center line of the second cylinder and the first horizontal line is e2; the second end face of the first piston and the second end face of the second piston are both away from the crankshaft, and the vertical distance between the second end face of the first piston and the center of the shaft hole is S1, and S1max is the maximum vertical distance between the second end face of the first piston and the center of the shaft hole; the vertical distance between the second end face of the second piston and the center of the shaft hole is S2, and S2max is the maximum vertical distance between the second end face of the second piston and the center of the shaft hole; the vertical distance S1 satisfies:

[0015] H+0.5mm≥S1max≥H;

[0016] The vertical distance S2 satisfies:

[0017]

[0018] H+0.5mm≥S2max≥H.

[0019] In some embodiments, the diameter of the first piston is D1, the diameter of the second piston is D2, and the diameter D1 and the diameter D2 satisfy:

[0020] A compressor comprises a pump body assembly, wherein the pump body assembly is the above-mentioned pump body assembly.

[0021] A refrigerator comprises a compressor, wherein the compressor is the above-mentioned compressor.

[0022] The present invention provides a pump assembly, a compressor and a refrigerator, which have the following beneficial effects:

[0023] The present invention can arrange two compression assemblies in a limited space by rotatably connecting the first ends of the two connecting rods to the connecting seat, and ensure that the first connecting rod and the second connecting rod have a certain degree of flexibility. The connecting seat transmits the rotational motion of the crankshaft to the first connecting rod and the second connecting rod, thereby driving the piston to reciprocate in the cylinder, so that the rotation of the crankshaft can synchronously drive the two pistons to achieve coordinated work. The connecting seat helps to balance the mechanical distribution of the entire compressor. Since the first cylinder and the second cylinder are arranged on the same side in the horizontal direction and the center lines are parallel to each other, this layout helps to maintain the balance of the compressor and improve the stability and efficiency of operation. This embodiment can simplify the assembly process by setting a connecting seat. If the first connecting rod and the second connecting rod are directly connected to the crankshaft, it will be necessary to set a plurality of eccentric parts on the crankshaft, which will increase the manufacturing difficulty and assembly complexity of the crankshaft. By using a connecting seat, the structure of the crankshaft can be simplified, making it easier to manufacture and maintain. Compared with two or more cylinders arranged opposite to each other, which is not conducive to assembly implementation, arranging two cylinders in the vertical direction on the same side requires two eccentric parts to be set on the crankshaft component, and it is very difficult to assemble the piston and connecting rod on the cylinder. This embodiment can effectively avoid these problems by setting a connecting seat, making the design and manufacture of the compressor more flexible and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0025] Figure 1 is a schematic diagram of a pump assembly according to an embodiment of the present invention;

[0026] Figure 2 An exploded view of a first connecting rod, a second connecting rod and a connecting seat according to an embodiment of the present invention;

[0027] Figure 3 is a schematic diagram of a mounting slot according to an embodiment of the present invention;

[0028] Figure 4 is a schematic diagram of an oil storage tank according to an embodiment of the present invention;

[0029] Figure 5is a schematic diagram of a connecting socket according to an embodiment of the present invention;

[0030] Figure 6 is a schematic diagram of a first compression assembly and a second compression assembly according to an embodiment of the present invention;

[0031] Figure 7 is a schematic diagram of an end surface of a cylinder seat according to an embodiment of the present invention;

[0032] Figures: 1-cylinder seat; 101-first cylinder; 102-second cylinder; 103-shaft hole; 2-connecting seat; 201-connecting sleeve; 202-first flange; 221-first rotary groove; 203-second flange; 231-second rotary groove; 3-first compression assembly; 301-first connecting rod; 311-first sleeve ring; 312-first connecting ring; 313-first connecting pin; 314-first limiting pin; 302-first piston; 4-second compression assembly; 401-second connecting rod; 411-second sleeve ring; 412-block; 402-second piston; 421-clamping groove; 422-mounting groove; 423-connecting groove; 424-first end face; 425-oil storage tank; 5-first connecting assembly; 501-first mounting pin; 502-first positioning pin; 503-first pin hole; 6-second connecting assembly; 601-second mounting pin; 602-second positioning pin; 603-second pin hole; 7-crankshaft; 8-bearing assembly. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0035] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0036] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0037] See also Figure 1 to Figure 2 As shown, according to an embodiment of the present invention, a pump body assembly is provided, including a cylinder seat 1, a connecting seat 2, a crankshaft 7, and a first compression assembly 3 and a second compression assembly 4; the cylinder seat 1 is at least provided with a first cylinder 101 and a second cylinder 102, the first cylinder 101 and the second cylinder 102 are arranged on the same side in the horizontal direction, and the center line of the first cylinder 101 and the center line of the second cylinder 102 are parallel to each other; the first compression assembly 3 includes a first connecting rod 301 and a first piston 302, and the first piston 302 is slidably arranged in the first cylinder 101; the second compression assembly 4 includes a second connecting rod 401 and a second piston 402, and the second piston 402 is slidably arranged in the second cylinder 102; the crankshaft 7 is arranged in the cylinder seat 1, the connecting seat 2 is connected to the crankshaft 7, the first end of the first connecting rod 301 and the first end of the second connecting rod 401 are rotatably connected to the connecting seat 2 respectively, the second end of the first connecting rod 301 is connected to the first piston 302, and the second end of the second connecting rod 401 is connected to the second piston 402.

[0038] Specifically, the crankshaft 7 is installed in the cylinder seat 1, and a bearing assembly 8 is provided on the crankshaft 7. The connecting seat 2 is connected to the crankshaft 7. During the rotation of the crankshaft 7, the connecting seat 2 is synchronously driven to rotate. The first end of the first connecting rod 301 is rotationally connected to the connecting seat 2, and the second end of the first connecting rod 301 is connected to the first piston 302. The first piston 302 is slidably arranged in the first cylinder 101. The first end of the second connecting rod 401 is rotationally connected to the connecting seat 2, and the second end of the second connecting rod 401 is connected to the second piston 402. The second piston 402 is slidably arranged in the second cylinder 102. During the rotation of the connecting seat 2, the first connecting rod 301 and the second connecting rod 401 are driven simultaneously, thereby converting the rotational motion of the crankshaft 7 into reciprocating movement of the piston, and the center line of the first piston 302 is parallel to the center line of the second piston 402.

[0039] In this embodiment, by rotating the first ends of the two connecting rods with the connecting seat 2, two compression assemblies can be arranged in a limited space, and the first connecting rod 301 and the second connecting rod 401 are ensured to have a certain degree of flexibility. The connecting seat 2 transmits the rotational motion of the crankshaft 7 to the first connecting rod 301 and the second connecting rod 401, thereby driving the piston to reciprocate in the cylinder, so that the rotation of the crankshaft 7 can synchronously drive the two pistons to achieve coordinated work, and the connecting seat 2 helps to balance the mechanical distribution of the entire compressor. Since the first cylinder 101 and the second cylinder 102 are arranged on the same side in the horizontal direction, and the center lines are parallel to each other, this layout helps to maintain the balance of the compressor and improve the stability and efficiency of operation. In this embodiment, the assembly process can be simplified by setting the connecting seat 2. If the first connecting rod 301 and the second connecting rod 401 are directly connected to the crankshaft 7, multiple eccentric parts will need to be set on the crankshaft 7, which will increase the manufacturing difficulty and assembly complexity of the crankshaft 7. By using the connecting seat 2, the structure of the crankshaft 7 can be simplified, making it easier to manufacture and maintain. Compared with two or more cylinders arranged opposite to each other, it is not conducive to assembly implementation. Arranging two cylinders in the vertical direction on the same side requires two eccentric parts to be set on the crankshaft 7 component, and it is very difficult to assemble the piston and connecting rod on the cylinder. This embodiment can effectively avoid these problems by setting the connecting seat 2, making the design and manufacture of the compressor more flexible and convenient.

[0040] See also Figures 1 to 4 As shown, the second end of the first connecting rod 301 is rotatably connected to the first piston 302 , and the second end of the second connecting rod 401 is locked with the second piston 402 .

[0041] Specifically, when the crankshaft 7 rotates in the cylinder block 1, the crankshaft 7 drives the second ends of the first connecting rod 301 and the second connecting rod 401 to rotate synchronously through the connecting seat 2. The first connecting rod 301 and the second connecting rod 401 are connected to the crankshaft 7 and the piston respectively. The first end of the first connecting rod 301 is rotationally connected to the connecting seat 2, and the second end is rotatably connected to the first piston 302; the first end of the second connecting rod 401 is also rotationally connected to the connecting seat 2, and the second end is locked with the second piston 402. With the rotation of the crankshaft 7, the reciprocating motion of the first connecting rod 301 and the second connecting rod 401 is transmitted to the first piston 302 and the second piston 402 respectively. Since the first piston 302 is rotatably connected to the first connecting rod 301, it can rotate slightly, while the second piston 402 can only reciprocate linearly due to the locking cooperation with the second connecting rod 401, and the second connecting rod 401 and the second piston 402 do not rotate relative to each other.

[0042] In this embodiment, the rotatable connection between the first connecting rod 301 and the first piston 302 provides a certain degree of freedom, and the locking cooperation between the second connecting rod 401 and the second piston 402 ensures that the reciprocating motion of the piston is a precise linear motion. The locking cooperation reduces the lateral movement of the second piston 402 in the second cylinder 102, thereby improving the efficiency of the compressor. The first connecting rod 301 and the second connecting rod 401 and the corresponding piston adopt different connection methods to form a more stable structure. The rotatable connection between the first connecting rod 301 and the first piston 302 provides a certain adjustment space, and the locking cooperation between the second connecting rod 401 and the second piston 402 provides a stable support, which together improves the structural stability of the entire compressor.

[0043] See also Figures 1 to 4 As shown, the second connecting rod 401 includes a clamping block 412 , which is disposed on the second end of the second connecting rod 401 , and the second piston 402 is provided with a clamping groove 421 , in which the clamping block 412 is embedded.

[0044] In this embodiment, the cooperation between the clamping block 412 and the clamping groove 421 is a structurally stable connection method, which makes the connection between the second piston 402 and the second connecting rod 401 more secure and reduces the possibility of loosening during operation. Moreover, this connection method can be quickly assembled and disassembled, and the cooperation between the clamping block 412 and the clamping groove 421 does not require additional tools or complicated operations, which facilitates assembly.

[0045] See also Figure 3As shown, the clamping groove 421 includes a mounting groove 422 and a connecting groove 423, the mounting groove 422 and the connecting groove 423 are arranged on the outer peripheral wall of the second piston 402, the end face of the second piston 402 facing the second connecting rod 401 is the first end face 424, one end of the connecting groove 423 is connected with the mounting groove 422, and the other end of the connecting groove 423 passes through the first end face 424, the clamping block 412 is embedded in the mounting groove 422, and part of the second connecting rod 401 is embedded in the first connecting groove 423.

[0046] Specifically, the mounting groove 422 and the connecting groove 423 are provided on the outer peripheral wall of the second piston 402, one end of the connecting groove 423 is connected with the mounting groove 422, and the other end of the connecting groove 423 passes through the first end face 424. When the second connecting rod 401 needs to be installed, the block 412 of the second connecting rod 401 is embedded in the mounting groove 422. In order to make the block 412 completely installed in the mounting groove 422, part of the second connecting rod 401 needs to be connected to the second piston 402. The provision of the connecting groove 423 is equivalent to providing an avoidance position. When part of the second connecting rod 401 is installed in the connecting groove 423, the block 412 is integrally installed in the mounting groove 422.

[0047] In this embodiment, part of the second connecting rod 401 is embedded in the connecting groove 423, so that the second connecting rod 401 can be smoothly connected to the second piston 402 during installation, and the block 412 can be completely installed in the installation groove 422. The installation groove 422 and the connecting groove 423 can improve the connection stability between the second piston 402 and the second connecting rod 401. The block 412 is embedded in the installation groove 422, and the connecting rod part is embedded in the connecting groove 423. This double embedding structure enhances the overall stability and reliability. Moreover, through the clamping of the block 412 and the installation groove 422, and the matching of the connecting rod part and the connecting groove 423, the movement of the second piston 402 and the second connecting rod 401 can be limited, ensuring the stability during operation and reducing the risk of damage caused by vibration or impact. In addition, this connection method simplifies the assembly process, making the connection between the second connecting rod 401 and the second piston 402 more convenient and quick. If maintenance or replacement of parts is required, this connection method is also easy to disassemble, which improves the efficiency of maintenance.

[0048] As a specific implementation, the second end of the first connecting rod 301 is provided with a first connecting ring 312, the first piston 302 is provided with a first mounting pin hole in the axial direction, the first piston 302 is provided with a first through hole in the radial direction, the connecting ring is installed in the first mounting pin hole, the first connecting pin 313 is installed in the first through hole, and the first connecting pin 313 passes through the first connecting ring 312. In the axial direction of the first piston 302, the first stop pin 314 connects the first piston 302 and the first connecting pin 313. The connecting pin and the stop pin are used to fix the relative position of the connecting rod and the piston, limit the displacement of the connecting rod and the piston during installation and operation, ensure that the connecting rod and the piston are correctly installed and aligned in the cylinder of the compressor, and can accurately position the piston. It is very important for the efficient operation of the compressor, and can ensure that the piston reciprocates smoothly in the cylinder. In addition, the stop pin and the positioning pin work together to improve the stability of the compressor during operation and reduce the dislocation or damage of components caused by vibration or impact.

[0049] As a specific implementation, an annular oil storage groove 425 is provided on the outer peripheral wall of the second piston 402 and the first piston 302. The oil storage groove 425 plays a lubricating role to reduce the friction between the first piston 302 and the second piston 402 and the cylinder.

[0050] See also Figures 1 to 5 As shown, the connecting seat 2 includes a connecting sleeve 201, a first flange 202 and a second flange 203. The connecting sleeve 201 is connected to the crankshaft 7. The first flange 202 and the second flange 203 are arranged on the outer peripheral wall of the connecting sleeve 201. The first flange 202 and the second flange 203 are arranged on the same side in the horizontal direction. The first end of the first connecting rod 301 is rotatably connected to the first flange 202, and the first end of the second connecting rod 401 is rotatably connected to the second flange 203.

[0051] Specifically, the top of the crankshaft 7 is provided with an eccentric portion, and a crank is provided on the eccentric portion. The connecting sleeve 201 is sleeved on the crank. Since the first flange 202 and the second flange 203 are provided on the outer peripheral wall of the connecting sleeve 201, it is equivalent to that the first connecting rod 301 and the second connecting rod 401 are laterally connected to the connecting seat 2. The crankshaft 7 rotates in the cylinder seat 1, and this rotational movement is the starting point of the movement process of the entire pump body assembly. The connecting sleeve 201 is connected to the crankshaft 7. The rotation of the crankshaft 7 directly drives the connecting sleeve 201 to rotate, and the first flange 202 and the second flange 203 on the connecting sleeve 201 rotate synchronously therewith. Since the first end of the first connecting rod 301 is rotatably connected to the first flange 202, and the first end of the second connecting rod 401 is rotatably connected to the second flange 203, when the first flange 202 and the second flange 203 rotate with the connecting sleeve 201, the first ends of the first connecting rod 301 and the second connecting rod 401 will also rotate accordingly. The rotational motion of the first connecting rod 301 and the second connecting rod 401 is converted into the reciprocating motion of the piston. The second end of the first connecting rod 301 is connected to the first piston 302, and the second end of the second connecting rod 401 is connected to the second piston 402. When the first connecting rod 301 and the second connecting rod 401 rotate, the reciprocating motion of the connecting rod drives the first piston 302 and the second piston 402 to move back and forth in their respective cylinders. The reciprocating motion of the first piston 302 and the second piston 402 in the cylinder realizes the suction and compression of the gas. During the compression process, the piston compresses the gas, and during the suction process, the piston re-inhales the gas. The continuous rotation of the crankshaft 7 causes the above-mentioned motion process to be continuously circulated, thereby realizing continuous operation of the compressor.

[0052] In this embodiment, the first flange 202 and the second flange 203 are arranged on the outer peripheral side of the connecting sleeve 201, which can make the structure of the entire connecting seat 2 more compact and save space. Since the connection point between the flange and the connecting rod is closer to the rotation center of the crankshaft 7, the length of the first connecting rod 301 and the second connecting rod 401 during the force transmission process can be reduced, thereby improving the force transmission efficiency. In addition, the arrangement of the first flange 202 and the second flange 203 increases the rigidity of the connecting seat 2, so that when working under high load or high pressure, the connecting seat 2 can maintain better shape and position stability.

[0053] See also Figures 1 to 6 As shown, a first end of the first connecting rod 301 is provided with a first ring 311, and the outer peripheral wall of the first flange 202 is provided with a radially inward first rotation groove 221, and the first ring 311 is installed in the first rotation groove 221; a first end of the second connecting rod 401 is provided with a second ring 411, and the outer peripheral wall of the second flange 203 is provided with a radially inward second rotation groove 231, and the second ring 411 is installed in the second rotation groove 231.

[0054] Specifically, the first ring 311 is installed in the first rotary groove 221, and the second ring 411 is installed in the second rotary groove 231, which is equivalent to the ring extending into the rotary groove for a certain length, and the ring can rotate in the rotary groove.

[0055] In this embodiment, radially inwardly swivel grooves are provided on the outer peripheral walls of the first flange 202 and the second flange 203, so that the collar can extend into the grooves and rotate. The provision of the swivel grooves simplifies the assembly process, making the connection between the first connecting rod 301 and the second connecting rod 401 and the flanges more convenient and quick. The provision of the swivel grooves provides a certain adjustment space for the rotation of the collar in the grooves. During the movement, the rotation of the collar in the swivel grooves can reduce lateral collisions and increase the stability of the connection between the connecting seat 2 and the connecting rod.

[0056] As a specific implementation, the first collar 311 is to be connected to the first rotary groove 221, and the second collar 411 is to be connected to the second rotary groove 231. A related connection structure can be provided in the rotary groove, such as a limit post is provided in the rotary groove, and the collar is sleeved on the limit post. By providing a limit post in the rotary groove and the collar is sleeved on the limit post, accurate positioning and stable connection can be provided. The limit post can prevent the collar from being displaced in the rotary groove, thereby ensuring the stability of the connection. Additional components can also be provided to connect the collar to the rotary groove. The additional components can provide additional connection strength, especially in the case of high load or dynamic load. These components can enhance the reliability and durability of the connection.

[0057] See also Figures 1 to 5 As shown, it also includes a first connecting component 5 and a second connecting component 6. The first connecting component 5 includes a first mounting pin 501 and a first positioning pin 502. Along the axial direction of the crankshaft 7, the first flange 202 is provided with a first pin hole 503. The first mounting pin 501 passes through the first sleeve 311 and is installed in the first pin hole 503. The first positioning pin 502 connects the first mounting pin 501 and the first flange 202; the second connecting component 6 includes a second mounting pin 601 and a second positioning pin 602. Along the axial direction of the crankshaft 7, the second flange 203 is provided with a second pin hole 603. The second mounting pin 601 passes through the second sleeve 411 and is installed in the second pin hole 603. The second positioning pin 602 connects the second mounting pin 601 and the second flange 203.

[0058] Specifically, the first collar 311 is installed in the first swivel groove 221, the first installation pin 501 passes through the first collar 311, and then is installed in the first pin hole 503 provided on the first flange 202, and then the first positioning pin 502 is connected to the first installation pin 501 and the first flange 202. Similarly, the installation process of the second connecting component 6 is the same as the installation process of the first connecting component 5.

[0059] In this embodiment, the first connecting assembly 5 and the second connecting assembly 6 adopt a mechanical connection method through the installation pin and the positioning pin to ensure the stable connection between the first collar 311 and the first flange 202, and the second collar 411 and the second flange 203. The first connecting assembly 5 and the second connecting assembly 6 enable the rotational motion of the crankshaft 7 to be stably transmitted to the first connecting rod 301 and the second connecting rod 401, and then to the first piston 302 and the second piston 402. In addition, the provision of the positioning pin and the installation pin can accurately locate the position of the collar relative to the flange, ensuring the centering of the connecting rod and the piston.

[0060] See also Figures 1 to 7As shown, with the end face of the cylinder seat 1 as the projection surface, the cylinder seat 1 is provided with an axial hole 103, the crankshaft 7 is vertically installed in the axial hole 103, the line between the crank center of the crankshaft 7 and the center of the axial hole 103 is the center line, and the length of the center line is R; the center of the axial hole 103 has a first horizontal line, and the angle between the center line and the first horizontal line is α; the connecting seat 2 includes a connecting sleeve 201, the connecting sleeve 201 is connected to the crankshaft 7, the line from the center of the connecting sleeve 201 to the center of the first pin hole 503 is the first line, and the length of the first line is F1, the center of the connecting sleeve 201 to the second pin hole 503 is the first line, and the length of the first line is F2. The line connecting the centers of the holes 603 is the second line, the length of the second line is F2, and the angle between the first line and the second line is θ; the second end of the first connecting rod 301 is provided with a first connecting ring 312, the distance from the center of the first ring 311 to the center of the first connecting ring 312 is L1, and the distance from the center of the second ring 411 to the second end face of the second connecting rod 401 is L2; ​​the first end face of the first piston 302 and the first end face of the second piston 402 are both facing the crankshaft 7, the second end face of the first piston 302 and the second end face of the second piston 402 are both away from the crankshaft 7, and the first piston 302 The first piston 402 is connected to the first connecting rod 301 through the first connecting pin 303. The vertical distance between the center of the pin hole of the first piston 302 and the second end surface of the first piston 302 is a1. The second piston 402 is provided with a clamping groove 421. The vertical distance between the inner wall of the clamping groove 421 and the second end surface of the second piston 402 is a2. The first cylinder 101 and the second cylinder 102 are opened on the wall surface of the cylinder seat 1. The vertical distance between the center of the shaft hole 103 and the wall surface of the cylinder seat 1 is H. The vertical distance between the center line of the first cylinder 101 and the first horizontal line is e1, and the vertical distance between the center line of the second cylinder 102 is e2. The vertical distance between the center line and the first horizontal line is e2; the second end surface of the first piston 302 and the second end surface of the second piston 402 are both away from the crankshaft 7, the vertical distance between the second end surface of the first piston 302 and the center of the shaft hole 103 is S1, S1max is the maximum vertical distance between the second end surface of the first piston 302 and the center of the shaft hole 103; the vertical distance between the second end surface of the second piston 402 and the center of the shaft hole 103 is S2, S2max is the maximum vertical distance between the second end surface of the second piston 402 and the center of the shaft hole 103; the vertical distance S1 satisfies:

[0061] H+0.5mm≥S1max≥H;

[0062] The vertical distance S2 satisfies:

[0063]

[0064] H+0.5mm≥S2max≥H.

[0065] In this embodiment, the stroke of the first piston 302 and the second piston 402 determines the selection of the above parameters, that is, the second end face stroke of the first piston 302 and the second end face stroke of the second piston 402 are determined by the specific parameter selection of the crankshaft, connecting rod, cylinder seat, piston, etc. The parameters involved in the formula are all related parameters of the piston front end face stroke, i.e., vertical distance S1 and vertical distance S2 in the above parts. Among them, when the length R increases, the maximum value of vertical distance S1 and vertical distance S2 increases, and the minimum value decreases, and the stroke of the piston front end face, i.e., S1max-S1min and S2max-S2min, will increase. When the vertical distance a1 and vertical distance a2 increase, the vertical distance S1 and vertical distance S2 increase, but the stroke of the piston front end face remains unchanged. When the distance L1 and distance L2 increase, the vertical distance S1 and vertical distance S2 increase, but the stroke of the piston front end face decreases. When the vertical distance e1 and vertical distance e2 increase, the vertical distance S1 and vertical distance S2 decrease, but the stroke of the piston front end face increases. The vertical distance S1 and the vertical distance S2 are related to multiple parameters, some of which change dynamically, such as the angle α between the center line and the first horizontal line, and some parameters need to be limited during design. Therefore, the vertical distance S1 and the vertical distance S2 are used to determine the vertical distance H between the front end surface of the cylinder seat 111 and the shaft hole 103 to ensure that the two pistons have a certain protrusion when they run to the maximum stroke to ensure complete exhaust.

[0066] Among them, as the length F1 increases, the maximum values ​​of S1 and S2 increase, the minimum values ​​decrease, and the stroke of the second end face of the piston, i.e., S1max-S1min and S2max-S2min, increases. As the length F2 increases, the maximum value of the vertical distance S2 decreases, the minimum value increases, and the stroke of the front end face of the piston, i.e., S1max-S1min and S2max-S2min, decreases. The larger the angle θ is, the smaller the maximum and minimum values ​​of the vertical distance S1 are, but the stroke of the second end face of the piston, i.e., S1max-S1min, increases.

[0067] It is worth noting that, as the center line of the crankshaft 7 and the angle α change, the vertical distance S1 will have a maximum value and a minimum value, and the vertical distance S2 will also have a maximum value and a minimum value. The effective stroke of the first piston 302 and the second piston 402 is the difference between the maximum value and the minimum value. The vertical distance S1 and the vertical distance S2 are the vertical distances between the second end faces of the first piston 302 and the second piston 402 and the center of the shaft hole 103, which can be understood as the motion equations of the front end faces of the two pistons. When the structure is approximated, by adjusting the structural parameters involved in the formula and modifying it, the vertical distance S1 and the vertical distance S2 still conform to the above formula.

[0068] Diameter D1 and diameter D2 satisfy: To ensure that the piston can slide back and forth in the cylinder. In this embodiment, the relationship between the diameter D1, the diameter D2 and the vertical distance e1, the vertical distance e2 is limited to prevent the two cylinder holes from being designed too large, exceeding the total length of the vertical distance e1 and the vertical distance e2, resulting in the two cylinder holes overlapping.

[0069] A compressor comprises a pump body assembly, wherein the pump body assembly is the above-mentioned pump body assembly.

[0070] A refrigerator comprises a compressor, wherein the compressor is the above-mentioned compressor.

[0071] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0072] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A pump assembly, characterized in that: include: A cylinder seat (1), a connecting seat (2), a crankshaft (7), a first compression assembly (3) and a second compression assembly (4); The cylinder base (1) is provided with at least a first cylinder (101) and a second cylinder (102), wherein the first cylinder (101) and the second cylinder (102) are arranged on the same side in a horizontal direction, and the center line of the first cylinder (101) and the center line of the second cylinder (102) are parallel to each other; the first compression assembly (3) comprises a first connecting rod (301) and a first piston (302), wherein the first piston (302) is slidably arranged in the first cylinder (101); the second compression assembly (4) comprises a second connecting rod (401) and a second piston (402), wherein the second piston (402) is slidably arranged in the second cylinder (102); The crankshaft (7) is arranged in the cylinder seat (1), the connecting seat (2) is connected to the crankshaft (7), the first end of the first connecting rod (301) and the first end of the second connecting rod (401) are respectively rotatably connected to the connecting seat (2), the second end of the first connecting rod (301) is connected to the first piston (302), and the second end of the second connecting rod (401) is connected to the second piston (402).

2. The pump assembly according to claim 1, characterized in that: The second end of the first connecting rod (301) is rotatably connected to the first piston (302), and the second end of the second connecting rod (401) is lockingly matched with the second piston (402).

3. The pump assembly according to claim 2, characterized in that: The second connecting rod (401) comprises a clamping block (412), wherein the clamping block (412) is arranged on the second end of the second connecting rod (401), and the second piston (402) is provided with a clamping groove (421), wherein the clamping block (412) is embedded in the clamping groove (421).

4. The pump assembly according to claim 3, characterized in that: The engaging groove (421) comprises a mounting groove (422) and a connecting groove (423); the mounting groove (422) and the connecting groove (423) are provided on the outer peripheral wall of the second piston (402); the end face of the second piston (402) facing the second connecting rod (401) is a first end face (424); one end of the connecting groove (423) is connected to the mounting groove (422); the other end of the connecting groove (423) passes through the first end face (424); the engaging block (412) is embedded in the mounting groove (422); and part of the second connecting rod (401) is embedded in the first connecting groove (423).

5. The pump assembly according to claim 1, characterized in that: The connecting seat (2) includes a connecting sleeve (201), a first flange (202) and a second flange (203); the connecting sleeve (201) is connected to the crankshaft (7); the first flange (202) and the second flange (203) are arranged on the outer peripheral wall of the connecting sleeve (201); the first flange (202) and the second flange (203) are arranged on the same side in the horizontal direction; the first end of the first connecting rod (301) is rotatably connected to the first flange (202); and the first end of the second connecting rod (401) is rotatably connected to the second flange (203).

6. The pump assembly according to claim 5, characterized in that: A first ring (311) is provided at the first end of the first connecting rod (301), a first radially inwardly directed first rotation groove (221) is formed on the outer peripheral wall of the first flange (202), and the first ring (311) is installed in the first rotation groove (221); a second ring (411) is provided at the first end of the second connecting rod (401), a second radially inwardly directed second rotation groove (231) is formed on the outer peripheral wall of the second flange (203), and the second ring (411) is installed in the second rotation groove (231).

7. The pump assembly according to claim 6, characterized in that: The crankshaft (7) further comprises a first connecting assembly (5) and a second connecting assembly (6), wherein the first connecting assembly (5) comprises a first mounting pin (501) and a first positioning pin (502), wherein the first flange (202) is provided with a first pin hole (503) along the axial direction of the crankshaft (7), the first mounting pin (501) passes through the first sleeve (311) and is installed in the first pin hole (503), and the first positioning pin (502) connects the first mounting pin (501) and the first flange (202); The second connecting component (6) includes a second mounting pin (601) and a second positioning pin (602). Along the axial direction of the crankshaft (7), the second flange (203) is provided with a second pin hole (603). The second mounting pin (601) passes through the second sleeve (411) and is installed in the second pin hole (603). The second positioning pin (602) connects the second mounting pin (601) and the second flange (203).

8. The pump assembly according to claim 7, characterized in that: Taking the end face of the cylinder seat (1) as a projection surface, the cylinder seat (1) is provided with an axial hole (103), the crankshaft (7) is vertically installed in the axial hole (103), the line between the crank center of the crankshaft (7) and the center of the axial hole (103) is the center line, and the length of the center line is R; the center of the axial hole (103) has a first horizontal line, and the angle between the center line and the first horizontal line is α; the connecting seat (2) includes a connecting sleeve (201), the connecting sleeve (201) is connected to the crankshaft (7), the line from the center of the connecting sleeve (201) to the center of the first pin hole (503) is the first line, and the connecting seat (2) includes a connecting sleeve (201), the connecting sleeve (201) is connected to the crankshaft (7), the connecting sleeve (201) is connected to the first pin hole (503), and the connecting sleeve (201) is connected to the first pin hole (503). The length of the first connecting line is F1, the connecting line from the center of the connecting sleeve (201) to the center of the second pin hole (603) is the second connecting line, the length of the second connecting line is F2, and the angle between the first connecting line and the second connecting line is θ; the second end of the first connecting rod (301) is provided with a first connecting ring (312), the distance from the center of the first sleeve ring (311) to the center of the first connecting ring (312) is L1, and the distance from the center of the second sleeve ring (411) to the second end face of the second connecting rod (401) is L2; ​​the first end face of the first piston (302) and the first end face of the second piston (402) are both facing the crankshaft (7) , the second end surface of the first piston (302) and the second end surface of the second piston (402) are both away from the crankshaft (7), the first piston (302) is connected to the first connecting rod (301) via a first connecting pin (313), the vertical distance between the center of the pin shaft hole of the first piston (302) and the second end surface of the first piston (302) is a1, the second piston (402) is provided with a clamping groove (421), and the vertical distance between the inner wall of the clamping groove (421) and the second end surface of the second piston (402) is a2; the first cylinder (101) and the second cylinder (102) are opened on the wall surface of the cylinder seat (1), The vertical distance between the center of the shaft hole (103) and the wall surface of the cylinder seat (1) is H; the vertical distance between the center line of the first cylinder (101) and the first horizontal line is e1, and the vertical distance between the center line of the second cylinder (102) and the first horizontal line is e2; the second end surface of the first piston (302) and the second end surface of the second piston (402) both face away from the crankshaft (7), the vertical distance between the second end surface of the first piston (302) and the center of the shaft hole (103) is S1, and S1max is the maximum vertical distance between the second end surface of the first piston (302) and the center of the shaft hole (103);The vertical distance between the second end surface of the second piston (402) and the center of the shaft hole (103) is S2, and S2max is the maximum vertical distance between the second end surface of the second piston (402) and the center of the shaft hole (103); the vertical distance S1 satisfies:; H+0.5mm≥S1max≥H; The vertical distance S2 satisfies: H+0.5mm≥S2max≥H.

9. The pump assembly according to claim 8, characterized in that: The diameter of the first piston (302) is D1, and the diameter of the second piston (402) is D2. The diameters D1 and D2 satisfy:

10. A compressor, comprising a pump assembly, characterized in that: The pump body assembly is the pump body assembly according to any one of claims 1 to 9.

11. A refrigerator, comprising a compressor, wherein the compressor is the compressor according to claim 10.

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