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 assembly, 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 assembly is connected with the crankshaft, the first end of the first connecting rod and the first end of the second connecting rod are connected with the connecting assembly, the second end of the first connecting rod is connected with the first piston, and the second end of the second connecting rod is connected with the second piston. By arranging the connecting assembly, the assembling process can be simplified, the structure of the crankshaft can be simplified, and the crankshaft is easier to assemble.

Description

Technical Field

[0001] The invention belongs to the technical field of compressors, 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 assembly, a crankshaft, and a first compression assembly and a second compression assembly;

[0005] The cylinder base 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, the first piston is slidably arranged in the first cylinder; the second compression assembly includes a second connecting rod and a second piston, the second piston is slidably arranged in the second cylinder;

[0006] The crankshaft is arranged in the cylinder seat, the connecting assembly is connected to the crankshaft, the first end of the first connecting rod and the first end of the second connecting rod are respectively connected to the connecting assembly, 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, in the axial direction of the crankshaft, the first end of the first connecting rod and the first end of the second connecting rod are overlapped and arranged on the connecting assembly.

[0008] In some embodiments, the connecting assembly includes a connecting sleeve, the connecting sleeve is connected to the crankshaft, and the first end of the first connecting rod and the first end of the second connecting rod are both sleeved on the connecting sleeve.

[0009] In some embodiments, the first connecting rod is arranged above the second connecting rod, and the connecting assembly also includes an intermediate bearing, which is sleeved on the connecting sleeve, the lower end surface of the first connecting rod contacts the top surface of the intermediate bearing, and the upper end surface of the second connecting rod contacts the bottom surface of the intermediate bearing.

[0010] In some embodiments, a thrust boss is provided at the top end of the connecting sleeve, the first connecting rod, the intermediate bearing and the second connecting rod are sequentially sleeved on the connecting sleeve, the top surface of the first connecting rod is connected to the thrust boss; the bottom end of the connecting sleeve abuts against the eccentric portion of the crankshaft.

[0011] In some embodiments, the axial extension direction of the first connecting rod and the second connecting rod is perpendicular to the axis of the crankshaft, 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 rotatably connected to the second piston.

[0012] In some embodiments, the first compression assembly further includes a first connecting pin and a first limiting pin, a first mounting hole is provided in the axial direction of the first piston, a first through hole is provided in the radial direction of the first piston, the second end of the first connecting rod is installed in the first mounting hole, the first connecting pin is installed in the first through hole, and the second end of the first connecting rod is sleeved on the top end of the first connecting pin; in the axial direction of the first piston, the first limiting pin connects the first piston and the first connecting pin;

[0013] The second compression assembly also includes a second connecting pin and a second limiting pin. A second mounting hole is provided in the axial direction of the second piston, and a second through hole is provided in the radial direction of the second piston. The second end of the second connecting rod is installed in the second mounting hole, and the second connecting pin is installed in the second through hole. The second end of the second connecting rod is sleeved on the bottom end of the second connecting pin; in the axial direction of the first piston, the second limiting pin connects the second piston and the second connecting pin.

[0014] In some embodiments, taking the end surface of the cylinder seat as the projection surface, the first end surface of the first piston and the first end surface of the second piston both face the crankshaft, and the second end surface of the first piston and the second end surface of the second piston both face away from the crankshaft; the cylinder seat is provided with an axial hole, and 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 first end of the first connecting rod is provided with a first crank sleeve hole, and the first connecting rod is sleeved on the connecting assembly through the first crank sleeve hole, and the distance between the center of the first crank sleeve hole and the center of the first connecting pin is The distance between the center of the second connecting pin and the center of the second connecting pin is L1; the first end of the second connecting rod is provided with a second crank sleeve hole, and the second connecting rod is sleeved on the connecting assembly through the second crank sleeve hole, and the distance between the center of the second crank sleeve hole and the center of the second connecting pin is L2; ​​the vertical distance between the center of the first through hole and the second end face of the first piston is a1, and the vertical distance between the center of the second through hole and the second end face of the second piston is a2; the first cylinder and the second cylinder are opened on the first end face of the cylinder seat, and the vertical distance between the center of the shaft hole and the first end face 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;

[0015] The vertical distance between the second end surface of the first piston and the center of the axial hole is S1, and S1max is the maximum vertical distance between the second end surface of the first piston and the center of the axial hole. The vertical distance S1 satisfies: H+0.5mm≥S1max≥H;

[0016] The vertical distance between the second end surface of the second piston and the center of the axial hole is S2, S2max is the maximum vertical distance between the second end surface of the second piston and the center of the axial hole, and the vertical distance S2 satisfies: H+0.5mm≥S2max≥H.

[0017] The diameter D1 and the diameter D2 satisfy:

[0018] A compressor comprises a pump body assembly, wherein the pump body assembly is the above-mentioned pump body assembly.

[0019] A refrigerator comprises a compressor, wherein the compressor is the above-mentioned compressor.

[0020] The present invention provides a pump assembly, a compressor and a refrigerator, which have the following beneficial effects:

[0021] The connecting assembly of the present invention 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, and the connecting assembly 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, reduce vibration, and improve the stability and efficiency of operation. This embodiment can simplify the assembly process by setting the connecting assembly. If the first connecting rod and the second connecting rod are directly connected to the crankshaft, it will be necessary to set multiple eccentric parts on the crankshaft, which will increase the manufacturing difficulty and assembly complexity of the crankshaft. By using the connecting assembly, the structure of the crankshaft can be simplified, making it easier to manufacture and maintain. Compared with two or more cylinders arranged oppositely, it is not conducive to assembly implementation, and two cylinders are arranged in the vertical direction on the same side, it is necessary to set two eccentric parts on the crankshaft component, and it is difficult to assemble the piston and the connecting rod on the cylinder. This embodiment can effectively avoid these problems by setting the connecting assembly, making the design and manufacture of the compressor more flexible and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] Figure 1 It is a schematic diagram of an explosion of a pump assembly according to an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the connection between a connecting assembly and a first connecting rod and a second connecting rod according to an embodiment of the present invention;

[0025] Figure 3 is a cross-sectional view of a first connecting rod and a second connecting rod according to an embodiment of the present invention;

[0026] Figure 4 An exploded view of a connecting assembly and a first connecting rod and a second connecting rod according to an embodiment of the present invention;

[0027] Figure 5 The end surface of the cylinder seat of the embodiment of the present invention;

[0028] Figure 6 for Figure 5 Sectional view at AA in the middle;

[0029] Figure 7 for Figure 5Cross-sectional view at BB in the middle.

[0030] Figures: 1-cylinder seat; 11-first cylinder; 12-second cylinder; 2-connecting assembly; 201-connecting sleeve; 211-thrust boss; 202-intermediate bearing; 3-crankshaft; 4-first compression assembly; 401-first connecting rod; 41-first end of the first connecting rod; 42-second end of the first connecting rod; 411-first ring; 412-first connecting ring; 402-first piston; 403-first connecting pin; 404-first limiting pin; 405-first through hole; 5-second compression assembly; 501-second connecting rod; 51-first end of the second connecting rod; 511-second ring; 512-second connecting ring; 52-second end of the second connecting rod; 502-second piston; 503-second connecting pin; 504-second limiting pin; 505-second through hole; 6-bearing assembly. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] See also Figures 1 to 3 As shown, according to an embodiment of the present invention, a pump body assembly is provided, which includes a cylinder block 1, a connecting assembly 2, a crankshaft 3, and a first compression assembly 4 and a second compression assembly 5; the cylinder block 1 is at least provided with a first cylinder 11 and a second cylinder 12, the first cylinder 11 and the second cylinder 12 are arranged on the same side in the horizontal direction, and the center line of the first cylinder 11 and the center line of the second cylinder 12 are parallel to each other; the first compression assembly 4 includes a first connecting rod 401 and a first piston 402, and the first piston 402 is slidably arranged in the first cylinder 11; the second compression assembly 5 includes a second connecting rod 501 and a second piston 502, and the second piston 502 is slidably arranged in the second cylinder 12; the crankshaft 3 is arranged in the cylinder block 1, the connecting assembly 2 is connected to the crankshaft 3, the first end 41 of the first connecting rod 401 and the first end 51 of the second connecting rod 501 are respectively connected to the connecting assembly 2, the second end 42 of the first connecting rod 401 is connected to the first piston 402, and the second end 52 of the second connecting rod 501 is connected to the second piston 502.

[0036] Specifically, the crankshaft 3 is installed in the cylinder seat 1, and a bearing assembly 6 is provided on the crankshaft 3. The connecting assembly 2 is connected to the crankshaft 3. The connecting assembly 2 is driven to rotate synchronously during the rotation of the crankshaft 3. The first end 41 of the first connecting rod 401 is connected to the connecting assembly 2, and the second end 42 of the first connecting rod 401 is connected to the first piston 402. The first piston 402 is slidably arranged in the first cylinder 11. The first end 51 of the second connecting rod 501 is connected to the connecting assembly 2, and the second end 52 of the second connecting rod 501 is connected to the second piston 502. The second piston 502 is slidably arranged in the second cylinder 12. During the rotation of the connecting assembly 2, the first connecting rod 401 and the second connecting rod 501 are driven simultaneously, thereby converting the rotational motion of the crankshaft 3 into reciprocating movement of the piston, and the center line of the first piston 402 is parallel to the center line of the second piston 502.

[0037] In this embodiment, the connecting assembly 2 transmits the rotational motion of the crankshaft 3 to the first connecting rod 401 and the second connecting rod 501, thereby driving the piston to reciprocate in the cylinder, so that the rotation of the crankshaft 3 can synchronously drive the two pistons to achieve coordinated work, and the connecting assembly 2 helps to balance the mechanical distribution of the entire compressor. Since the first cylinder 11 and the second cylinder 12 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, reduce vibration, and improve the stability and efficiency of operation. This embodiment can simplify the assembly process by setting the connecting assembly 2. If the first connecting rod 401 and the second connecting rod 501 are directly connected to the crankshaft 3, it will be necessary to set a plurality of eccentric parts on the crankshaft 3, which will increase the manufacturing difficulty and assembly complexity of the crankshaft 3. By using the connecting assembly 2, the structure of the crankshaft 3 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 3, 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 component 2, making the design and manufacture of the compressor more flexible and convenient.

[0038] See also Figures 1 to 3 As shown, in the axial direction of the crankshaft 3 , the first end 41 of the first connecting rod 401 and the first end 51 of the second connecting rod 501 are overlapped and arranged on the connecting assembly 2 .

[0039] Specifically, since the center line of the first cylinder 11 and the center line of the second cylinder 12 are parallel to each other, that is, the first piston 402 and the second piston 502 are also parallel to each other during the interaction, in order to avoid movement interference between the first connecting rod 401 and the second connecting rod 501, the first end 41 of the first connecting rod 401 and the first end 51 of the second connecting rod 501 are overlapped, so that the first connecting rod 401 and the second connecting rod 501 extend in two directions.

[0040] In this embodiment, since the center lines of the first cylinder 11 and the second cylinder 12 are parallel to each other, the first piston 402 and the second piston 502 are also parallel to each other during the interaction process. By overlapping the first end 41 of the first connecting rod 401 and the first end 51 of the second connecting rod 501, interference between the two connecting rods during the movement process can be effectively avoided, thereby ensuring the compactness of the internal structure of the compressor and the coordination of the movement. The overlapping arrangement allows the two connecting rods to be arranged more efficiently in a limited space, which is conducive to application in compressors with limited space. Moreover, the overlapping connecting rods can share the same connecting assembly 2, which helps to improve the rigidity of the entire compressor structure, reduce vibration and noise, and thus improve the operating efficiency and life of the compressor. Through the overlapping arrangement, the number and complexity of the required parts can also be reduced, the manufacturing and assembly process can be simplified, and the production cost can be reduced.

[0041] See also Figures 1 to 3 As shown, the connecting assembly 2 includes a connecting sleeve 201 , which is connected to the crankshaft 3 , and the first end 41 of the first connecting rod 401 and the first end 51 of the second connecting rod 501 are both sleeved on the connecting sleeve 201 .

[0042] Specifically, the connecting sleeve 201 is connected to the crankshaft 3, the first end 41 of the first connecting rod 401 is provided with a first ring 411, and the first end 51 of the second connecting rod 501 is provided with a second ring 511. The first ring 411 and the second ring 511 are sleeved on the connecting sleeve 201, and the first ring 411 and the second ring 511 are overlapped. When the crankshaft 3 rotates, the crankshaft 3 drives the connecting sleeve 201 to rotate, and the connecting sleeve 201 drives the first connecting rod 401 and the second connecting rod 501 to reciprocate, and the first connecting rod 401 and the second connecting rod 501 rotate relative to the connecting sleeve 201, so that the first connecting rod 401 and the second connecting rod 501 respectively drive the first piston 402 and the second piston 502 to move.

[0043] In this embodiment, by using the connecting sleeve 201, it is possible to avoid setting a plurality of eccentric parts on the crankshaft 3, thereby simplifying the design and manufacture of the crankshaft 3, helping to improve production and assembly efficiency and reduce costs. Moreover, if the first connecting rod 401 and the second connecting rod 501 are directly connected to the crankshaft 3, the complexity of assembly will be increased. The use of the connecting sleeve 201 is equivalent to providing an intermediary link, making the assembly process easier. Especially in the case of limited space, the connecting sleeve 201 also allows the first connecting rod 401 and the second connecting rod 501 to rotate relative to the connecting sleeve 201, rather than being directly connected to the crankshaft 3, which helps to improve the coordination of the movement of the first piston 402 and the second piston 502, ensuring that the two pistons can work synchronously and effectively. In addition, by adopting the design of the connecting sleeve 201, the first connecting rod 401 and the second connecting rod 501 can be maintained or replaced without disassembling the entire crankshaft 3. This arrangement helps to simplify the maintenance process and reduce maintenance costs.

[0044] See also Figures 1 to 3 As shown, the first connecting rod 401 is arranged above the second connecting rod 501, and the connecting assembly 2 also includes an intermediate bearing 202, which is sleeved on the connecting sleeve 201, the lower end surface of the first connecting rod 401 contacts the top surface of the intermediate bearing 202, and the upper end surface of the second connecting rod 501 contacts the bottom surface of the intermediate bearing 202.

[0045] Specifically, the first end 41 of the first connecting rod 401 and the first end 51 of the second connecting rod 501 are arranged to overlap. In this embodiment, the first connecting rod 401 is defined to be arranged above the second connecting rod 501. In other embodiments, the positions of the two can also be interchanged. After the first sleeve ring 411 of the first connecting rod 401 is sleeved on the connecting sleeve 201, the intermediate bearing 202 is sleeved on the connecting sleeve 201, and finally the second sleeve ring 511 of the second connecting rod 501 is sleeved on the connecting sleeve 201. At this time, the intermediate bearing 202 is located between the first sleeve ring 411 and the second sleeve ring 511. When the crankshaft 3 drives the connecting sleeve 201 to rotate, since the first connecting rod 401 and the second connecting rod 501 also rotate relative to the connecting sleeve 201, the lower end surface of the first connecting rod 401 contacts the top surface of the intermediate bearing 202, and the upper end surface of the second connecting rod 501 contacts the bottom surface of the intermediate bearing 202.

[0046] In this embodiment, the connection sleeve 201 is used so that the first sleeve 411 and the second sleeve 511 can be sleeved on the connection sleeve 201. This design can improve the stability of the entire compressor structure. The first sleeve 411 and the second sleeve 511 are provided with an intermediate bearing 202, which can prevent the connection failure between the first sleeve 411 and the second sleeve 511 during pushing or use. The intermediate bearing 202 can reduce the friction and wear between the first sleeve 411 and the second sleeve 511 components by providing a stable contact surface for the first connecting rod 401 and the second connecting rod 501. The effect of reducing friction helps to improve the efficiency and life of the compressor. In addition, the intermediate bearing 202 can provide additional support to increase the stability of the entire compressor structure.

[0047] As a specific implementation, the intermediate bearing 202 includes a retainer and balls, and the lower end surface of the first connecting rod 401 and the upper end surface of the second connecting rod 501 are respectively in contact with the balls. The ball bearing uses rolling friction instead of traditional sliding friction, which can significantly reduce the friction of the connecting rod during movement. Since the rolling friction coefficient is much smaller than the sliding friction coefficient, this design helps to reduce energy loss and improve the efficiency of the compressor. The retainer evenly distributes the balls between the lower end surface of the first connecting rod 401 and the upper end surface of the second connecting rod 501, so that the load is evenly distributed on the contact surface of the bearing, which can reduce local stress concentration and extend the service life of the bearing.

[0048] See also Figures 1 to 3 As shown, a thrust boss 211 is provided at the top of the connecting sleeve 201, and the first connecting rod 401, the intermediate bearing 202 and the second connecting rod 501 are sequentially sleeved on the connecting sleeve 201, and the top surface of the first connecting rod 401 is connected to the thrust boss 211; the bottom end of the connecting sleeve 201 abuts against the eccentric part of the crankshaft 3.

[0049] Specifically, the top of the crankshaft 3 is provided with an eccentric portion, and a crank is provided on the eccentric portion. Before installing the connecting sleeve 201, the first sleeve ring 411 of the first connecting rod 401 is firstly sleeved on the connecting sleeve 201, and the top surface of the first sleeve ring 411 of the first connecting rod 401 abuts against the thrust boss 211, the intermediate bearing 202 is sleeved on the connecting sleeve 201, and then the sleeve ring of the second connecting rod 501 is sleeved on the connecting sleeve 201. After the first connecting rod 401, the second connecting rod 501 and the connecting sleeve 201 are installed, and then the connecting sleeve 201 is sleeved on the crank, the bottom end of the connecting sleeve 201 abuts against the eccentric portion.

[0050] In this embodiment, the thrust boss 211 provides an axial positioning surface for the first connecting rod 401, ensuring the correct position of the first connecting rod 401 in the connecting sleeve 201 and preventing it from being displaced in the axial direction. During the operation of the compressor, the connecting rod and the piston will be subjected to the axial force generated by the gas pressure. The thrust boss 211 is connected to the top surface of the first connecting rod 401, and can transmit and withstand these axial forces, thereby protecting the connecting sleeve 201 from being damaged by the axial force. The thrust boss 211 can also serve as a supporting point for the intermediate bearing 202. When the intermediate bearing 202 is located between the first connecting rod 401 and the second connecting rod 501, the thrust boss 211 can provide additional support, enhance the structural rigidity of the connecting sleeve 201, and help reduce deformation under high load or high-speed operation conditions, thereby improving the performance and reliability of the entire compressor.

[0051] As a specific implementation, the outer diameter of the thrust boss 211 is d3, the outer diameter of the first collar 411 of the first connecting rod 401 is the same as the outer diameter of the connecting sleeve 201, both are d1, the inner diameter of the connecting sleeve 201 is d2, and the diameter d3 is greater than d1.

[0052] See also Figures 1 to 3 As shown, the axial extension direction of the first connecting rod 401 and the second connecting rod 501 is perpendicular to the axis of the crankshaft 3 , the second end 42 of the first connecting rod 401 is rotatably connected to the first piston 402 , and the second end 52 of the second connecting rod 501 is rotatably connected to the second piston 502 .

[0053] Specifically, the first end 41 of the first connecting rod 401 and the first end 51 of the second connecting rod 501 can rotate relative to the connecting sleeve 201. In the compressor, the piston needs to reciprocate in the cylinder to compress the gas. One end of the connecting rod is rotatably connected to the piston so that the piston can move freely back and forth in the cylinder, while the other end is rotatably connected to the connecting sleeve 201, which can convert the rotational motion of the crankshaft 3 into the reciprocating motion of the piston.

[0054] In this embodiment, the rotational connection enables the first connecting rod 401 and the second connecting rod 501 to move without being subjected to lateral force, thereby reducing the friction and wear between the connecting rod and the piston or the connecting sleeve 201. The rotational connection can more accurately control the movement of the piston, ensuring that the piston moves evenly and stably in the cylinder. Moreover, the rotational connection can more effectively transmit the rotational power of the crankshaft 3 to the piston, while allowing the first connecting rod 401 and the second connecting rod 501 to rotate freely during the rotation of the crankshaft 3, thereby helping to optimize the force transmission efficiency.

[0055] See also Figures 1 to 3As shown, the first compression assembly 4 also includes a first connecting pin 403 and a first limiting pin 404. A first mounting hole is provided in the axial direction of the first piston 402, and a first through hole 405 is provided in the radial direction of the first piston 402. The second end 42 of the first connecting rod 401 is installed in the first mounting hole, and the first connecting pin 403 is installed in the first through hole 405. The second end 42 of the first connecting rod 401 is sleeved on the top end of the first connecting pin 403. In the axial direction of the first piston 402, the first limiting pin 404 connects the first piston 402 and the first connecting pin 403. 3; the second compression assembly 5 also includes a second connecting pin 503 and a second limiting pin 504, a second mounting hole is provided in the axial direction of the second piston 502, a second through hole 505 is provided in the radial direction of the second piston 502, the second end 52 of the second connecting rod 501 is installed in the second mounting hole, the second connecting pin 503 is installed in the second through hole 505, and the second end 52 of the second connecting rod 501 is sleeved on the bottom end of the second connecting pin 503; in the axial direction of the first piston 402, the second limiting pin 504 connects the second piston 502 and the second connecting pin 503.

[0056] Specifically, the second end 42 of the first connecting rod 401 is provided with a first connecting ring 412, and the second end 52 of the second connecting rod 501 is provided with a second connecting ring 512. After the first connecting ring 412 of the first connecting rod 401 is installed in the first mounting hole, the first connecting pin 403 is installed in the first through hole 405 from the vertical direction. The first connecting pin 403 passes through the first connecting ring 412 of the first connecting rod 401, that is, the first connecting ring 412 of the first connecting rod 401 is fixed in the first mounting hole, and then the first limiting pin 404 is horizontally inserted into the first piston 402, so as to connect the first piston 402 and the first connecting pin 403. Similarly, the installation of the second connecting rod 501 and the second piston 502 is the same as the installation process of the first connecting rod 401 and the first piston 402.

[0057] In this embodiment, the connecting pin and the limit 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 accurate positioning is essential for the efficient operation of the compressor, which can ensure smooth reciprocating motion of the piston in the cylinder, and the limit 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. The setting of the connecting pin and the limit pin makes it easier to install and maintain the first connecting rod 401 and the second connecting rod 501, and the use of the positioning pin and the limit pin can enhance the structural strength of the compressor, especially in an environment with high pressure and high temperature, and can provide additional support and protection.

[0058] It is worth noting that when the pump body is assembled, the lower end surface of the pin hole of the second connecting rod 501 contacts the lower end surface inside the second piston 502 to support the overlapping connection assembly 2, and the lower end surface of the pin hole of the first connecting rod 401 should contact the upper end surface inside the first piston 402 or maintain a certain gap to ensure that the first connecting rod 401 and the second connecting rod 501 can be smoothly assembled with the connecting sleeve 201.

[0059] See also Figures 4 to 7 As shown, taking the end surface of the cylinder seat 1 as the projection surface, the first end surface of the first piston 402 and the first end surface of the second piston 502 are both facing the crankshaft 3, and the second end surface of the first piston 402 and the second end surface of the second piston 502 are both away from the crankshaft 3; the cylinder seat 1 is provided with an axial hole, and the crankshaft 3 is vertically installed in the axial hole; the line between the crank center of the crankshaft 3 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 first end 41 of the first connecting rod 401 is provided with a first crank sleeve hole, and the first connecting rod 401 is sleeved on the connecting assembly 2 through the first crank sleeve hole, and the distance between the center of the first crank sleeve hole and the center of the first connecting pin 403 is L1; the second connecting rod 5 The first end 51 of the piston 01 is provided with a second crank sleeve hole, and the second connecting rod 501 is sleeved on the connecting assembly 2 through the second crank sleeve hole, and the distance between the center of the second crank sleeve hole and the center of the second connecting pin 503 is L2; ​​the vertical distance between the center of the first through hole 405 and the second end face of the first piston 402 is a1, and the vertical distance between the center of the second through hole 505 and the second end face of the second piston 502 is a2; the first cylinder 11 and the second cylinder 12 are opened on the first end face of the cylinder block 1, and the vertical distance between the center of the shaft hole and the first end face of the cylinder block 1 is H; the vertical distance between the center line of the first cylinder 11 and the first horizontal line is e1, and the vertical distance between the center line of the second cylinder 12 and the first horizontal line is e2;

[0060] Specifically, the vertical distance between the second end surface of the first piston 402 and the center of the shaft hole is S1, and the vertical distance S1 satisfies: S1max is the maximum vertical distance between the second end surface of the first piston 402 and the center of the shaft hole 101, H+0.5mm≥S1max≥H;

[0061] Specifically, the vertical distance between the second end surface of the second piston 502 and the center of the shaft hole is S2, S2max is the maximum vertical distance between the second end surface of the second piston 502 and the center of the shaft hole 101, and the vertical distance S2 satisfies: H+0.5mm≥S2max≥H.

[0062] In this embodiment, the stroke of the first piston 402 and the second piston 502 determines the selection of the above parameters, that is, the second end face stroke of the first piston 402 and the second end face stroke of the second piston 502 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 sizes of the vertical distance S1 and the vertical distance S2 are related to multiple parameters, and the parameters will also change during the rotation of the crankshaft 3. Therefore, by limiting the vertical distance S1 and the vertical distance S2, the correct position and movement of the piston in the cylinder can be ensured, thereby determining the stroke of the piston, that is, the maximum distance the piston moves from one end of the cylinder to the other end. The parameters involved in the formula will affect the compression ratio of the gas and the performance of the compressor. By accurately controlling the vertical distance S1 and the vertical distance S2, the compression efficiency of the compressor can be optimized, and by adjusting the vertical distance S1 and the vertical distance S2, the compressor can adapt to different working conditions and requirements, such as different pressure and temperature ranges.

[0063] It is worth noting that, as the center line of the crankshaft 312 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 402 and the second piston 502 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 402 and the second piston 502 and the center of the shaft hole, 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.

[0064] See also Figures 4 to 7 As shown, the diameter of the first piston 402 is D1, the diameter of the second piston 502 is D2, and the diameter D1 and the diameter D2 satisfy:

[0065] In this embodiment, the vertical distance S1 and the vertical distance S2 are limited in order to determine the first end face of the cylinder seat 1 and the distance H, so as to ensure that the two pistons have a certain protrusion when they run to the maximum stroke to ensure complete exhaust. The relationship between the diameter D1, the diameter D2 and the vertical distance e1, the vertical distance e2 is limited in order to prevent the two cylinder holes from being designed too large and exceeding the total length of the vertical distance e1 and the vertical distance e2, resulting in overlap of the two cylinder holes.

[0066] A compressor comprises a pump body assembly, wherein the pump body assembly is the above-mentioned pump body assembly.

[0067] A refrigerator comprises a compressor, wherein the compressor is the above-mentioned compressor.

[0068] 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.

[0069] 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 base (1), a connecting assembly (2), a crankshaft (3), a first compression assembly (4), and a second compression assembly (5); The cylinder base (1) is provided with at least a first cylinder (11) and a second cylinder (12), wherein the first cylinder (11) and the second cylinder (12) are arranged on the same side in a horizontal direction, and the center line of the first cylinder (11) and the center line of the second cylinder (12) are parallel to each other; the first compression assembly (4) comprises a first connecting rod (401) and a first piston (402), wherein the first piston (402) is slidably arranged in the first cylinder (11); the second compression assembly (5) comprises a second connecting rod (501) and a second piston (502), wherein the second piston (502) is slidably arranged in the second cylinder (12); The crankshaft (3) is arranged in the cylinder seat (1), the connecting assembly (2) is connected to the crankshaft (3), the first end (41) of the first connecting rod (401) and the first end (51) of the second connecting rod (501) are respectively connected to the connecting assembly (2), the second end (42) of the first connecting rod (401) is connected to the first piston (402), and the second end (52) of the second connecting rod (501) is connected to the second piston (502).

2. The pump assembly according to claim 1, characterized in that: In the axial direction of the crankshaft (3), the first end (41) of the first connecting rod (401) and the first end (51) of the second connecting rod (501) are overlapped and arranged on the connecting assembly (2).

3. The pump assembly according to claim 2, characterized in that: The connecting assembly (2) comprises a connecting sleeve (201), the connecting sleeve (201) being connected to the crankshaft (3), and the first end (41) of the first connecting rod (401) and the first end (51) of the second connecting rod (501) being sleeved on the connecting sleeve (201).

4. The pump assembly according to claim 3, characterized in that: The first connecting rod (401) is arranged above the second connecting rod (501), and the connecting assembly (2) also includes an intermediate bearing (202), and the intermediate bearing (202) is sleeved on the connecting sleeve (201), the lower end surface of the first connecting rod (401) contacts the top surface of the intermediate bearing (202), and the upper end surface of the second connecting rod (501) contacts the bottom surface of the intermediate bearing (202).

5. The pump assembly according to claim 4, characterized in that: A thrust boss (211) is provided at the top end of the connecting sleeve (201); the first connecting rod (401), the intermediate bearing (202) and the second connecting rod (501) are sequentially sleeved on the connecting sleeve (201); the top surface of the first connecting rod (401) is connected to the thrust boss (211); and the bottom end of the connecting sleeve (201) abuts against the eccentric portion of the crankshaft (3).

6. The pump assembly according to claim 2, characterized in that: The axial extension direction of the first connecting rod (401) and the second connecting rod (501) is perpendicular to the axis of the crankshaft (3); the second end (42) of the first connecting rod (401) is rotatably connected to the first piston (402); and the second end (52) of the second connecting rod (501) is rotatably connected to the second piston (502).

7. The pump assembly according to claim 6, characterized in that: The first compression assembly (4) further comprises a first connecting pin (403) and a first limiting pin (404); a first mounting hole is provided in the axial direction of the first piston (402); a first through hole (405) is provided in the radial direction of the first piston (402); the second end (42) of the first connecting rod (401) is installed in the first mounting hole; the first connecting pin (403) is installed in the first through hole (405); the second end (42) of the first connecting rod (401) is sleeved on the top end of the first connecting pin (403); in the axial direction of the first piston (402), the first limiting pin (404) connects the first piston (402) and the first connecting pin (403); The second compression assembly (5) further comprises a second connecting pin (503) and a second limiting pin (504); a second mounting hole is provided in the axial direction of the second piston (502); a second through hole (505) is provided in the radial direction of the second piston (502); the second end (52) of the second connecting rod (501) is installed in the second mounting hole; the second connecting pin (503) is installed in the second through hole (505); the second end (52) of the second connecting rod (501) is sleeved on the bottom end of the second connecting pin (503); in the axial direction of the first piston (402), the second limiting pin connects the second piston (502) and the second connecting pin (503).

8. The pump assembly according to claim 7, characterized in that: Taking the end surface of the cylinder seat (1) as a projection surface, the first end surface of the first piston (402) and the first end surface of the second piston (502) are both facing the crankshaft (3), and the second end surface of the first piston (402) and the second end surface of the second piston (502) are both away from the crankshaft (3); the cylinder seat (1) is provided with an axial hole (101), and the crankshaft (3) is vertically installed in the axial hole (101); the line between the crank center of the crankshaft (3) and the center of the axial hole (101) is the center line, and the length of the center line is R; the center of the axial hole (101) has a first horizontal line, and the angle between the center line and the first horizontal line is α; the first end (41) of the first connecting rod (401) is provided with a first crank sleeve hole, and the first connecting rod (401) is sleeved on the connecting assembly (2) through the first crank sleeve hole, and the distance between the center of the first crank sleeve hole and the center of the first connecting pin (403) is 1. The distance is L1; the first end (51) of the second connecting rod (501) is provided with a second crank sleeve hole, and the second connecting rod (501) is sleeved on the connecting assembly (2) through the second crank sleeve hole, and the distance between the center of the second crank sleeve hole and the center of the second connecting pin (503) is L2; ​​the vertical distance between the center of the first through hole (405) and the second end surface of the first piston (402) is a1, and the vertical distance between the center of the second through hole (505) and the second end surface of the second piston (502) is a2; the first cylinder (11) and the second cylinder (12) are opened on the first end surface of the cylinder seat (1), and the vertical distance between the center of the shaft hole (101) and the first end surface of the cylinder seat (1) is H; the vertical distance between the center line of the first cylinder (11) and the first horizontal line is e1, and the vertical distance between the center line of the second cylinder (12) and the first horizontal line is e2; The vertical distance between the second end surface of the first piston (402) and the center of the shaft hole (101) is S1, S1max is the maximum vertical distance between the second end surface of the first piston (402) and the center of the shaft hole (101), and the vertical distance S1 satisfies: H+0.5mm≥S1max≥H; The vertical distance between the second end surface of the second piston (502) and the center of the shaft hole (101) is S2, S2max is the maximum vertical distance between the second end surface of the second piston (502) and the center of the shaft hole (101), and 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 (402) is D1, the diameter of the second piston (502) is D2, The diameter D1 and the diameter 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, characterized in that: The compressor is the compressor according to claim 10.

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