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 direction dividing piece, a crankshaft, a first piston and a second piston. 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 lines of the first cylinder and the second cylinder are parallel to each other; the crankshaft is arranged in the air cylinder seat, the diverting piece comprises a first supporting rod and a second supporting rod, the connecting end of the first supporting rod is connected with a first piston, and the first piston is slidably arranged in the first air cylinder; the connecting end of the second supporting rod is connected with a second piston, and the second piston is arranged in a second air cylinder in a sliding mode. The direction dividing piece comprises the first supporting rod and the second supporting rod, the two compression assemblies can be arranged in a limited space, it is ensured that the first supporting rod and the second supporting rod have certain flexibility, the direction dividing piece transmits the rotating motion of the crankshaft to the first supporting rod and the second supporting rod, and assembling is simplified.

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, comprising a cylinder seat, a splitter, a crankshaft, a first piston and a second piston;

[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 lines of the first cylinder and the second cylinder are parallel to each other;

[0006] The crankshaft is arranged in the cylinder seat, the splitter is connected to the crankshaft, and the splitter includes a first support rod and a second support rod. The connecting end of the first support rod is connected to the first piston, and the first piston is slidably arranged in the first cylinder; the connecting end of the second support rod is connected to the second piston, and the second piston is slidably arranged in the second cylinder.

[0007] In some embodiments, the connecting end of the first support rod is rotatably connected to the first piston, the connecting end of the second support rod is rotatably connected to the second piston, and the second piston is a block structure in which blocks are connected to each other.

[0008] In some embodiments, the second piston includes a connecting block and a compression block. Along the axial direction of the second cylinder, the compression block is arranged on the outside of the connecting block, the connecting end of the second support rod is rotatably connected to the first end of the connecting block, the second end of the connecting block is connected to the compression block, and the connecting block is translationally arranged in the radial direction of the compression block.

[0009] In some embodiments, a translation wedge is disposed at the second end of the connecting block, a slide groove is disposed on the end surface of the compression block facing the connecting block, and the translation wedge is slidably disposed in the slide groove.

[0010] In some embodiments, the diameter of the compression block is larger than the maximum diameter of the second end of the connection block, and the radial width of the slide groove is larger than the radial width of the translation wedge block.

[0011] In some embodiments, the splitter further includes a connecting sleeve, the connecting sleeve is connected to the crankshaft, and the fixed end of the first support rod and the fixed end of the second support rod are both connected to the outer peripheral wall of the connecting sleeve.

[0012] In some embodiments, the first support rod and the second support rod are arranged at an angle with the end surface of the splitter being used as a projection surface.

[0013] In some embodiments, taking 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 outer diameter of the first piston is D1, the outer diameter of the second piston is D2, 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; a first through hole is provided in the radial direction of the first piston, the first piston is connected to the first support rod through a first connecting pin, the first connecting pin is installed in the first through hole, and the vertical distance between the center of the first through hole and the end face of the first piston facing away from the first support rod is a1; a The second through hole, the connecting block is connected to the second support rod through a second connecting pin, the second connecting pin is installed in the second through hole, the vertical distance between the center of the second through hole and the end face of the compression block away from the connecting block is a2, 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; there is an angle θ between the first support rod and the second support rod, the vertical distance between the second end face of the first piston and the center of the shaft hole is S1, S1max is the maximum vertical distance between the second end face of the first piston and the center of the shaft hole, and the vertical distance S1 satisfies:

[0014] H+0.5mm≥S1max≥H;

[0015] 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:

[0016]

[0017] H+0.5mm≥S2max≥H.

[0018] In some embodiments, the diameter of the first piston is D1, and the diameter of the second piston is D2;

[0019] The diameter D1 and the diameter D2 satisfy:

[0020] In some embodiments, the vertical distance between the geometric center of the compression block and the geometric center of the connection block is F, and the vertical distance F satisfies:

[0021]

[0022] A compressor comprises a pump body assembly, wherein the pump body assembly is the above-mentioned pump body assembly.

[0023] A refrigerator comprises a compressor, wherein the compressor is the above-mentioned refrigerator.

[0024] The present invention provides a pump assembly, a compressor and a refrigerator, which have the following beneficial effects:

[0025] The splitter of the present invention includes a first support rod and a second support rod, and two compression assemblies can be arranged in a limited space, and the first support rod and the second support rod are ensured to have a certain degree of flexibility. The splitter transmits the rotational motion of the crankshaft to the first support rod and the second support 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. 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. The present invention can simplify the assembly process by arranging the splitter. If the first support rod and the second support rod are directly connected to the crankshaft, it will be necessary to arrange a plurality of eccentric parts on the crankshaft, which will increase the manufacturing difficulty and assembly complexity of the crankshaft. By using the splitter, 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 provided on the crankshaft component, and it is very difficult to assemble the piston and the support rod on the cylinder. The present invention can effectively avoid these problems by providing a splitter, thereby making the design and manufacture of the compressor more flexible and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] Figure 1 is a schematic diagram of a pump assembly according to an embodiment of the present invention;

[0028] Figure 2 is a schematic diagram of a direction dividing member according to an embodiment of the present invention;

[0029] Figure 3 is a schematic diagram of a second piston according to an embodiment of the present invention;

[0030] Figure 4 is a cross-sectional view of a second piston according to an embodiment of the present invention;

[0031] Figure 5 is a schematic diagram of a diameter D2 according to an embodiment of the present invention;

[0032] Figure 6 Schematic diagram of the end surface of the cylinder seat according to an embodiment of the present invention.

[0033] Figures: 1-cylinder seat; 101-first cylinder; 102-second cylinder; 103-axial hole; 2-divider; 201-first support rod; 202-second support rod; 203-connecting sleeve; 3-crankshaft; 4-first piston; 5-second piston; 501-connecting block; 511-translational wedge block; 502-compression block; 521-slide groove; 61-first connecting pin; 62-first connecting pin. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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 seat 1, a splitter 2, a crankshaft 3, a first piston 4 and a second piston 5; 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 lines of the first cylinder 101 and the second cylinder 102 are parallel to each other; the crankshaft 3 is arranged in the cylinder seat 1, the splitter 2 is connected to the crankshaft 3, the splitter 2 includes a first support rod 201 and a second support rod 202, the connecting end of the first support rod 201 is connected to the first piston 4, and the first piston 4 is slidably arranged in the first cylinder 101; the connecting end of the second support rod 202 is connected to the second piston 5, and the second piston 5 is slidably arranged in the second cylinder 102.

[0039] Specifically, the crankshaft 3 is installed in the cylinder seat 1, a bearing assembly is provided on the crankshaft 3, the splitter 2 is connected to the crankshaft 3, and the splitter 2 is synchronously driven to rotate during the rotation of the crankshaft 3. The connecting end of the first support rod 201 is connected to the first piston 4, and the first piston 4 is slidably arranged in the first cylinder 101. The connecting end of the second support rod 202 is connected to the second piston 5, and the second piston 5 is slidably arranged in the second cylinder 102. During the rotation of the splitter 2, the first support rod 201 and the second support rod 202 are driven simultaneously, thereby converting the rotational motion of the crankshaft 3 into the reciprocating motion of the piston, and the center line of the first piston 4 is parallel to the center line of the second piston 5.

[0040] In this embodiment, the splitter 2 includes a first support rod 201 and a second support rod 202, and two compression assemblies can be arranged in a limited space, and the first support rod 201 and the second support rod 202 are ensured to have a certain degree of flexibility. The splitter 2 transmits the rotational motion of the crankshaft 3 to the first support rod 201 and the second support rod 202, 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 splitter 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 splitter 2 can simplify the assembly process. If the first support rod 201 and the second support rod 202 are directly connected to the crankshaft 3, multiple eccentric parts will need to be arranged on the crankshaft 3, which will increase the manufacturing difficulty and assembly complexity of the crankshaft 3. By using the splitter 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, 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 3, and it is very difficult to assemble the piston and support rod on the cylinder. This embodiment can effectively avoid these problems by setting the splitter 2, making the design and manufacture of the compressor more flexible and convenient.

[0041] See also Figures 1 to 3 As shown, the connecting end of the first support rod 201 is rotatably connected to the first piston 4, and the connecting end of the second support rod 202 is rotatably connected to the second piston 5. The second piston 5 is a block structure in which blocks are connected to each other.

[0042] In this embodiment, the connecting ends of the first support rod 201 and the second support rod 202 are rotatably connected to the piston. This connection method can enhance the stability and reliability of the structure and reduce problems caused by improper assembly. The second piston 5 is set to a block structure, and the structure can be adjusted to a certain extent without affecting the operation of the second piston 5.

[0043] See also Figures 1 to 5 As shown, the second piston 5 includes a connecting block 501 and a compression block 502. Along the axial direction of the second cylinder 102, the compression block 502 is arranged on the outside of the connecting block 501, the connecting end of the second support rod 202 is rotatably connected to the first end of the connecting block 501, the second end of the connecting block 501 is connected to the compression block 502, and the connecting block 501 is translationally arranged in the radial direction of the compression block 502.

[0044] Specifically, the second end of the second support rod 202 is connected to the second piston 5, and the second piston 5 is slidably disposed in the second cylinder 102. Specifically, the second support rod 202 drives the connecting block 501 to move, thereby driving the compression block 502 to compress the air. Since the first support rod 201 and the second support rod 202 are connected and fixed, the second piston 5 will produce an additional radial displacement in the second cylinder 102 in addition to the reciprocating linear motion, so that the center line of the second piston cannot remain coincident with the center line of the second cylinder 102. In this embodiment, the second piston 5 is a block structure, and the connecting block 501 can translate in the radial direction, thereby offsetting the additional radial displacement.

[0045] In this embodiment, the sliding of the translation wedge block 511 allows the connecting block 501 to move within a certain range, which can reduce the additional constraints caused by the fixed connection, thereby reducing the restrictions on the movement accuracy and freedom of the entire structure, so that the mechanical structure can be more flexibly adapted to different working conditions and environments. In addition, during the assembly or operation process, there may be manufacturing errors or installation deviations. The translation of the connecting block 501 can absorb these errors, compensate for the deviations between components, and ensure the normal sliding of the second piston 5.

[0046] See also Figures 1 to 5 As shown, a translation wedge 511 is disposed at the second end of the connecting block 501 , and a slide groove 521 is disposed on the end surface of the compression block 502 facing the connecting block 501 , and the translation wedge 511 is slidably disposed in the slide groove 521 .

[0047] Specifically, before installing the second piston 5, the translation wedge block 511 is first installed in the slide groove 521, and then the second piston 5 is installed as a whole into the first cylinder 101. When the crankshaft 3 drives the splitter 2, the second support rod 202 drives the second piston 5 to move, the compression block 502 and the connecting block 501 will slide, and the translation wedge block 511 can slide in the slide groove 521.

[0048] In this embodiment, the wedge block can move smoothly in the slide groove 521. The setting of the wedge block and the slide groove 521 can reduce the friction and wear when the piston moves in the cylinder. By translating the sliding of the wedge block 511 in the slide groove 521, precise control of the movement of the second piston 5 can be achieved.

[0049] See also Figures 1 to 5 As shown, the diameter of the compression block 502 is greater than the maximum diameter of the second end of the connection block 501 , and the radial width of the slide groove 521 is greater than the radial width of the translation wedge block 511 .

[0050] In this embodiment, by setting the diameter of the compression block 502 to be larger than the diameter of the second end of the connecting block 501, and the radial width of the slide groove 521 to be larger than the radial width of the translation wedge block 511, the contact area between the wedge block and the slide groove 521 can be reduced, thereby reducing friction and wear. In addition, the larger compression block 502 and slide groove 521 design can provide more space for the wedge block to slide, increasing the flexibility of the system, allowing the wedge block to move more smoothly in the slide groove 521. The larger diameter and width setting provides more space for assembly and adjustment, making the fit between the wedge block and the slide groove 521 easier and convenient for installation.

[0051] See also Figures 1 to 5 As shown, the splitter 2 further includes a connecting sleeve 203 , which is connected to the crankshaft 3 , and the fixed end of the first support rod 201 and the fixed end of the second support rod 202 are both connected to the outer peripheral wall of the connecting sleeve 203 .

[0052] Specifically, the crankshaft 3 is connected to the fixed ends of the first support rod 201 and the second support rod 202 through the connecting sleeve 203. When the crankshaft 3 rotates, the force is transmitted to the fixed ends of the first support rod 201 and the second support rod 202 through the connecting sleeve 203. The first support rod 201 and the second support rod 202 are connected to the outer peripheral wall of the connecting sleeve 203 through their fixed ends, so that the connecting rod can move with the rotation of the connecting sleeve 203. The other end of the first support rod 201 is connected to the first piston 4, and the other end of the second support rod 202 is connected to the second piston 5. When the first support rod 201 and the second support rod 202 move, they drive the first piston 4 and the second piston 5 to reciprocate in their respective cylinders. The movement of the first piston 4 and the second piston 5 in the cylinder is responsible for compressing and sucking the refrigerant. During the compression process, the piston moves to reduce the space in the cylinder, thereby increasing the pressure and temperature of the refrigerant vapor. During the suction process, the retreat of the piston provides space for the refrigerant vapor to enter the cylinder, and the continuous rotation of the crankshaft 3 causes the first support rod 201 and the second support rod 202 to continuously reciprocate, thereby causing the first piston 4 and the second piston 5 to continuously perform compression and suction operations in the cylinder, forming a continuous working cycle.

[0053] In this embodiment, the connecting sleeve 203 is connected to the crankshaft 3, and the first support rod 201 and the second support rod 202 are respectively connected to the first piston 4 and the second piston 5, so that the rotational motion of the crankshaft 3 can be effectively transmitted to the piston to realize the reciprocating motion of the piston. The use of the connecting sleeve 203 can simplify the structure of the pump body assembly, reduce the complex mechanical structure required for directly connecting the crankshaft 3 and the piston, and facilitate assembly.

[0054] See also Figures 1 to 5 As shown, with the end surface of the splitter 2 as the projection surface, the first support rod 201 and the second support rod 202 are arranged at an angle.

[0055] In this embodiment, the setting of the angle can make the force transmission between the first support rod 201 and the second support rod 202 more direct and effective when driving the piston, thereby avoiding the interference of the movement of the first support rod 201 and the second support rod 202. By adjusting the angle between the first support rod 201 and the second support rod 202, the possibility of interference during the movement can be reduced, thereby avoiding collision and wear between components.

[0056] See also Figure 6 As 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 3 is vertically installed in the axial hole 103, the outer diameter of the first piston 4 is D1, the outer diameter of the second piston 5 is D2, the line between the crank center of the crankshaft 3 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; a first through hole is provided in the radial direction of the first piston 4, the first piston 4 is connected to the first support rod 201 through a first connecting pin 61, the first connecting pin 61 is installed in the first through hole, and the vertical distance between the center of the first through hole and the end face of the first piston 4 away from the first support rod 201 is a1; a second through hole is provided in the radial direction of the connecting block 501, connecting The block 501 is connected to the second support rod 202 through the second connecting pin 62, and the second connecting pin 62 is installed in the second through hole. The vertical distance between the center of the second through hole and the end face of the compression block 502 away from the connecting block 501 is a2, and the vertical distance between the center of the shaft hole 103 and the first end face 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; there is an angle θ between the first support rod 201 and the second support rod 202, and the vertical distance between the second end face of the first piston 4 and the center of the shaft hole 103 is S1, S1max is the maximum vertical distance between the second end face of the first piston 4 and the center of the shaft hole 103, and the vertical distance S1 satisfies:

[0057] H+0.5mm≥S1max≥H;

[0058] The vertical distance between the second end surface of the second piston 5 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 5 and the center of the shaft hole 103, and the vertical distance S2 satisfies:

[0059]

[0060] H+0.5mm≥S2max≥H.

[0061] In this embodiment, since the stroke of the first piston 4 and the second piston 5 determines the selection of the above parameters, that is, the stroke of the second end face of the first piston 4 and the second end face of the second piston 5 is determined by the specific parameters 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.

[0062] It is worth noting that, as the center line of the crankshaft 3 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 4 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 4 and the second piston 5 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.

[0063] See also Figure 6 As shown, the diameter of the first piston 4 is D1, and the diameter of the second piston 5 is D2;

[0064] Diameter D1 and diameter D2 satisfy:

[0065] In this embodiment, the vertical distance S1 and the vertical distance S2 are limited in order to determine the distance H between the first end surface of the cylinder base 11, so as to ensure that the two pistons have a certain protrusion when they run to the maximum stroke, thereby ensuring complete exhaust.

[0066] See also Figure 6 As shown, the vertical distance between the geometric center of the compression block 502 and the geometric center of the connection block 501 is F, and the vertical distance F satisfies:

[0067]

[0068] In this embodiment, since there is a fixed center line angle θ of the splitter 2, the second piston 5 will have a lateral displacement in the horizontal plane perpendicular to the reciprocating direction. The amount of translation that can be adjusted and offset is determined by adjusting the distance F between the compression block 502 and the connecting block 501. This distance F is also the maximum distance that the translation wedge block 511 is displaced to the far left or far right.

[0069] As a specific implementation method, in order to prevent the translation end 162 from colliding with the inner wall of the cylinder due to excessive lateral displacement, the edges of the connecting block 501 on both sides should not exceed the outer circular edges of the compression block 502, the diameter of the second piston 5 is D2, that is, the diameter of the first end face of the second piston 5 is D2, the end face of the connecting block 501 provided with the translation wedge 511 includes an arc segment and a straight line segment, the top and bottom surfaces of the connecting block 501 are both arc segments, the two ends of the arc segment are connected by straight line segments respectively, the vertical distance between the two arc segments is h4, and the vertical distance from the connection of the arc segment and the straight line segment to the horizontal center line of the connecting block 501 is h3, so the center line distance F between the compression block 502 and the translation block should meet the following constraints:

[0070]

[0071] In this embodiment, since the translation wedge block 511 needs to move in the groove, the arc segment of the second piston is equivalent to preventing the translation wedge block 511 from sliding out of the groove, that is, the maximum dimension of the end face of the connecting block 501 is always smaller than the end face dimension of the compression block 502.

[0072] A compressor comprises a pump body assembly, and the pump body assembly is the above-mentioned pump body assembly.

[0073] A refrigerator comprises a compressor, wherein the compressor is the above-mentioned refrigerator.

[0074] 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.

[0075] 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 splitter (2), a crankshaft (3), a first piston (4) and a second piston (5); The cylinder base (1) is provided with at least 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 lines of the first cylinder (101) and the second cylinder (102) are parallel to each other; The crankshaft (3) is arranged in the cylinder seat (1), the splitter (2) is connected to the crankshaft (3), the splitter (2) comprises a first support rod (201) and a second support rod (202), the connecting end of the first support rod (201) is connected to the first piston (4), and the first piston (4) is slidably arranged in the first cylinder (101); the connecting end of the second support rod (202) is connected to the second piston (5), and the second piston (5) is slidably arranged in the second cylinder (102).

2. The pump assembly according to claim 1, characterized in that: The connecting end of the first support rod (201) is rotatably connected to the first piston (4), and the connecting end of the second support rod (202) is rotatably connected to the second piston (5). The second piston (5) is a block structure in which blocks are connected to each other.

3. The pump assembly according to claim 2, characterized in that: The second piston (5) comprises a connecting block (501) and a compression block (502); along the axial direction of the second cylinder (102), the compression block (502) is arranged on the outer side of the connecting block (501); the connecting end of the second support rod (202) is rotatably connected to the first end of the connecting block (501); the second end of the connecting block (501) is connected to the compression block (502); and the connecting block (501) is arranged to be translatably disposed in the radial direction of the compression block (502).

4. The pump assembly according to claim 3, characterized in that: The second end of the connecting block (501) is provided with a translation wedge block (511), and the end surface of the compression block (502) facing the connecting block (501) is provided with a slide groove (521), and the translation wedge block (511) can be slidably arranged in the slide groove (521).

5. The pump assembly according to claim 3, characterized in that: The diameter of the compression block (502) is greater than the maximum diameter of the second end of the connection block (501), and the radial width of the slide groove (521) is greater than the radial width of the translation wedge block (511).

6. The pump assembly according to claim 1, characterized in that: The splitter (2) further comprises a connecting sleeve (203), the connecting sleeve (203) being connected to the crankshaft (3), and the fixed end of the first support rod (201) and the fixed end of the second support rod (202) being both connected to the outer peripheral wall of the connecting sleeve (203).

7. The pump assembly according to claim 6, characterized in that: Taking the end surface of the direction dividing member (2) as a projection surface, the first support rod (201) and the second support rod (202) are arranged at an angle.

8. The pump assembly according to claim 5, characterized in that: The end surface of the cylinder seat (1) is used as a projection surface. The cylinder seat (1) is provided with an axial hole (103). The crankshaft (3) is vertically installed in the axial hole (103). The outer diameter of the first piston (4) is D1. The outer diameter of the second piston (5) is D2. The connecting line between the crank center of the crankshaft (3) and the center of the axial hole (103) is a center connecting line. The length of the center connecting line is R. The first support rod (201) is connected to the first piston (4) via a pin. The first support rod (201) is provided with a first connecting pin hole. The crank center of the crankshaft (3) is connected to the first connecting pin hole. The vertical distance between the connecting pin holes is L1, the second support rod (202) is connected to the second piston (5) through a pin shaft, the second support rod (202) is provided with a second connecting pin hole, the vertical distance between the crank center of the crankshaft (3) and the second connecting pin hole is L2, the center of the shaft hole (103) has a first horizontal line, and the angle between the center line and the first horizontal line is α; the first piston (4) is provided with a first through hole in the radial direction, the first piston (4) is connected to the first support rod (201) through a first connecting pin (61), and the first connecting pin (61) The connecting block (501) is installed in the first through hole, and the vertical distance between the center of the first through hole and the end surface of the first piston (4) facing away from the first support rod (201) is a1; the connecting block (501) is provided with a second through hole in the radial direction, the connecting block (501) is connected to the second support rod (202) through a second connecting pin (62), the second connecting pin (62) is installed in the second through hole, and the vertical distance between the center of the second through hole and the end surface of the compression block (502) facing away from the connecting block (501) is a2; the center of the axial hole (103) and the cylinder seat (1) are The vertical distance between the first end surface of the first piston (4) and the first horizontal line 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; an angle θ is formed between the first support rod (201) and the second support rod (202); the vertical distance between the second end surface of the first piston (4) 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 (4) and the center of the shaft hole (103), and the vertical distance S1 satisfies: H+0.5mm≥S1max≥H; The vertical distance between the second end surface of the second piston (5) 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 (5) and the center of the shaft hole (103), 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 (4) is D1, and the diameter of the second piston (5) is D2; The diameter D1 and the diameter D2 satisfy:

10. The pump assembly according to claim 9, characterized in that: The vertical distance between the geometric center of the compression block (502) and the geometric center of the connection block (501) is F, and the vertical distance F satisfies:

11. The pump assembly according to claim 10, characterized in that: The diameter of the second piston (5) is D2, the end surface of the connecting block (501) provided with the translation wedge block (511) includes an arc segment and a straight line segment, the top surface and the bottom surface of the connecting block (501) are both arc segments, the two ends of the arc segment are respectively connected by the straight line segment, the vertical distance between the two arc segments is h4, the vertical distance from the connection point of the arc segment and the straight line segment to the horizontal center line of the connecting block (501) is h3, and the compression block (502) and the vertical distance F meet the following constraints:

12. A compressor, comprising a pump body assembly, wherein the pump body assembly is the pump body assembly according to any one of claims 1 to 11.

13. A refrigerator, comprising a compressor, wherein the compressor is the compressor according to claim 12.

Images