Compressor and refrigerator
By setting the first and second chambers in the compressor and using the communication air holes to achieve double-stage compression of gas, the problems of multiple parts and large volume of single-cylinder compressors are solved, and the compression effect of streamlined structure and high-efficiency is achieved .
Patent Information
- Application Number
- CN202420792256.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-16
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-04-16
AI Technical Summary
When existing single-cylinder compressors undergo multi-stage compression, there are many parts, resulting in larger volume, increasing assembly difficulty and cost, and at the same time they are not conducive to heat dissipation and affecting energy efficiency.
A compressor is designed to reduce the additional piston by setting the first and second stage chambers in the cylinder and piston body, and using the communication vent holes to achieve double-stage compression of gas. and drive structure, simplifying the structure of the compressor.
It realizes single-cylinder double-stage compression, reduces the difficulty of parts and assembly, reduces manufacturing costs, reduces the volume of the compressor, and improves heat dissipation effect and energy efficiency.
Smart Images
Figure CN222141463U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of compressors, in particular to a compressor and a refrigerator. Background Art
[0002] At present, the cylinder of a reciprocating compressor is generally driven by a crankshaft to swing the connecting rod, so as to push and pull the piston to perform reciprocating compression movement in the cylinder, thereby compressing the refrigerant to perform work. An existing single-cylinder compressor can usually only perform single-stage compression. If multi-stage compression is to be performed, multiple cylinders are often required to be connected in series, and multiple pistons, connecting rods and crankshafts are required. This will result in a compressor with many parts, high cost, and difficult assembly. At the same time, the size of the compressor will also increase, making the installation space of the compressor in the system compact, which is not conducive to the heat dissipation of the compressor, and may cause the suction superheat to increase, affecting the energy efficiency of the compressor. Utility Model Content
[0003] The main purpose of the utility model is to provide a compressor and a refrigerator, aiming to solve the problem that when a single-cylinder compressor is used for multi-stage compression, there are many parts, resulting in a larger compressor volume.
[0004] To achieve the above-mentioned purpose, the compressor proposed by the utility model comprises:
[0005] Cylinder body;
[0006] The piston structure comprises a piston body which is linearly reciprocatingly mounted in the cylinder body; and
[0007] A driving structure, driving the piston body to reciprocate;
[0008] A first-stage cavity and a second-stage cavity are defined between the two ends of the piston body corresponding to the two ends of the cylinder body, wherein the cross-sectional area of the first-stage cavity is set to be larger than the cross-sectional area of the second-stage cavity, and the cylinder body is provided with a first air inlet hole and a first exhaust hole connected to the first-stage cavity, and a second air inlet hole and a second exhaust hole connected to the second-stage cavity, and the first exhaust hole is connected to the second air inlet hole.
[0009] In one embodiment, a convex portion is provided at one end of the piston body, and the convex portion, one end of the piston body and one end of the cylinder body jointly define the second stage cavity, so that the cross-sectional area of the first stage cavity is larger than the cross-sectional area of the second stage cavity.
[0010] In one embodiment, the protrusion comprises a piston rod connected to the piston body, and the piston rod is drivingly connected to the driving structure.
[0011] In one embodiment, the piston rod reciprocates along a straight line.
[0012] In one embodiment, the driving structure comprises:
[0013] A crankshaft including a rotating portion arranged eccentrically for rotation; and
[0014] The transmission structure is arranged between the rotating part and the piston rod, and is used for converting the rotation of the rotating part into the linear movement of the piston rod.
[0015] In one embodiment, the transmission structure includes a roller sleeve sleeved on the rotating part, the roller sleeve can rotate relative to the rotating part, and the circumferential side portion of the roller sleeve is hingedly connected to the piston rod.
[0016] In one embodiment, a clamping groove is provided on the circumferential side of the rolling sleeve, and correspondingly, the piston rod is provided with a clamping protrusion that cooperates with the clamping groove.
[0017] In one embodiment, the piston rod is provided with an accommodation groove for accommodating the edge of the slot.
[0018] In one embodiment, the piston body and the piston rod are integrally formed.
[0019] In one embodiment, a communicating air passage connecting the first exhaust hole and the second intake hole is provided in the cylinder body.
[0020] The utility model also provides a refrigerator, comprising the above-mentioned compressor, wherein the compressor comprises:
[0021] Cylinder body;
[0022] The piston structure comprises a piston body which is linearly reciprocatingly mounted in the cylinder body; and
[0023] A driving structure, driving the piston body to reciprocate;
[0024] A first-stage cavity and a second-stage cavity are defined between the two ends of the piston body corresponding to the two ends of the cylinder body, wherein the cross-sectional area of the first-stage cavity is set to be larger than the cross-sectional area of the second-stage cavity, and the cylinder body is provided with a first air inlet hole and a first exhaust hole connected to the first-stage cavity, and a second air inlet hole and a second exhaust hole connected to the second-stage cavity, and the first exhaust hole is connected to the second air inlet hole.
[0025] The technical solution of the utility model adopts the cylinder body to cooperate with the piston body to define the first-stage chamber and the second-stage chamber at both ends of the piston body, and the cross-sectional area of the first-stage chamber is set to be larger than the cross-sectional area of the second-stage chamber, so that the maximum volume of the second-stage chamber is smaller than the maximum volume of the first-stage chamber, and the first exhaust hole is connected with the second air inlet hole to connect the first-stage chamber with the second-stage chamber, and at the same time, the driving structure is adopted to drive the piston body to reciprocate in the cylinder body to compress the gas in the first-stage chamber and the second-stage chamber respectively. In this way, by setting the cylinder body and the piston body, the second-stage chamber with a smaller maximum volume and the first-stage chamber with a larger maximum volume are formed at both ends of the piston body, so that the second-stage chamber can compress the first-stage chamber The compressed gas in the first-stage chamber is compressed, and the first exhaust hole and the second intake hole are connected to introduce the compressed gas in the first-stage chamber into the second-stage chamber. At the same time, the driving structure is set so that the piston body can not only compress the gas in the first-stage chamber but also continue to compress the compressed gas introduced into the second-stage chamber when it reciprocates, so that the compressor can realize single-cylinder two-stage compression, so as to avoid the need to additionally set the piston structure and the driving structure, which is conducive to streamlining the structure of the compressor and can greatly reduce the parts of the compressor, which can not only reduce the assembly difficulty and manufacturing cost of the compressor, but also reduce the volume of the compressor, improve the heat dissipation effect of the compressor, and help improve the energy efficiency of the compressor, thereby solving the problem that there are many parts and the compressor is large when a single-cylinder compressor is used for multi-stage compression. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0027] Figure 1 A schematic cross-sectional view of a compressor according to an embodiment of the present invention;
[0028] Figure 2 A schematic cross-sectional view of another embodiment of a compressor provided by the utility model;
[0029] Figure 3 A schematic cross-sectional view of another embodiment of a compressor provided by the utility model;
[0030] Figure 4The present invention is a schematic cross-sectional structural diagram of another embodiment of a compressor provided by the present invention.
[0031] Description of Figure Numbers:
[0032] 100. compressor; 1. cylinder block; 11. connecting air passage; 2. piston structure; 21. piston body; 22. piston rod; 221. accommodating groove; 31. first-stage chamber; 311. first air inlet hole; 312. first air exhaust hole; 32. second-stage chamber; 321. second air inlet hole; 322. second air exhaust hole; 4. driving structure; 41. crankshaft; 42. transmission structure; 421. roller sleeve; 51. slot; 52. cam.
[0033] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0035] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.
[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.
[0037] At present, the cylinder of a reciprocating compressor is generally driven by a crankshaft to swing the connecting rod, so as to push and pull the piston to perform reciprocating compression movement in the cylinder, thereby compressing the refrigerant to perform work. An existing single-cylinder compressor can usually only perform single-stage compression. If multi-stage compression is to be performed, multiple cylinders are often required to be connected in series, and multiple pistons, connecting rods and crankshafts are required. This will result in a compressor with many parts, high cost, and difficult assembly. At the same time, the size of the compressor will also increase, making the installation space of the compressor in the system compact, which is not conducive to the heat dissipation of the compressor, and may cause the suction superheat to increase, affecting the energy efficiency of the compressor.
[0038] The utility model proposes a compressor, aiming to solve the problem that a single-cylinder compressor has many parts and a large compressor volume when performing multi-stage compression. Figures 1 to 4 This is a schematic structural diagram of the compressor provided by the utility model.
[0039] See also Figures 1 to 4 In one embodiment of the utility model, the compressor includes a cylinder body 1, a piston structure 2 and a drive structure 4, wherein the piston structure 2 includes a piston body 21 linearly reciprocatingly installed in the cylinder body 1, and the drive structure 4 drives the piston body 21 to reciprocate, wherein a first-stage cavity 31 and a second-stage cavity 32 are defined between the two ends of the piston body 21 corresponding to the two ends of the cylinder body 1, wherein the cross-sectional area of the first-stage cavity 31 is set to be larger than the cross-sectional area of the second-stage cavity 32, and the cylinder body 1 is provided with a first air inlet hole 311 and a first exhaust hole 312 connected to the first-stage cavity 31, and a second air inlet hole 321 and a second exhaust hole 322 connected to the second-stage cavity 32, and the first exhaust hole 312 is connected to the second air inlet hole 321.
[0040] The technical solution of the utility model adopts the cylinder body 1 to cooperate with the piston body 21 to define the first stage chamber 31 and the second stage chamber 32 at the two ends of the piston body 21, and the cross-sectional area of the first stage chamber 31 is set to be larger than the cross-sectional area of the second stage chamber 32, so that the maximum volume of the second stage chamber 32 is smaller than the maximum volume of the first stage chamber 31, and the first exhaust hole 312 is connected with the second intake hole 321 to communicate with the first stage chamber 31 and the second stage chamber 32, and at the same time, the driving structure 4 is adopted to drive the piston body 21 to reciprocate in the cylinder body 1 to compress the gas in the first stage chamber 31 and the second stage chamber 32 respectively. In this way, by setting the cylinder body 1 and the piston body 21, the second stage chamber 32 with a smaller maximum volume and the first stage chamber 31 with a larger maximum volume are formed at the two ends of the piston body 21, so that the second stage chamber 32 with a smaller maximum volume and the first stage chamber 31 with a larger maximum volume are formed. 32 can compress the gas compressed in the first-stage chamber 31, and introduce the gas compressed in the first-stage chamber 31 into the second-stage chamber 32 by connecting the first exhaust hole 312 and the second intake hole 321. At the same time, by setting the driving structure 4, the piston body 21 can not only compress the gas in the first-stage chamber 31 but also continue to compress the compressed gas introduced into the second-stage chamber 32 when it reciprocates, so that the compressor can achieve single-cylinder two-stage compression, so as to avoid the need to additionally set the piston structure 2 and the driving structure 4, which is conducive to streamlining the structure of the compressor and can greatly reduce the parts of the compressor, which can not only reduce the assembly difficulty and manufacturing cost of the compressor, but also reduce the volume of the compressor, improve the heat dissipation effect of the compressor, and help improve the energy efficiency of the compressor, thereby solving the problem of using a single-cylinder compressor for multi-stage compression due to the large number of parts and the large volume of the compressor.
[0041] It should be noted that the cylinder body 1 and the piston body 21 may have various shapes, for example, the cylinder body 1 may be a cylindrical structure or a prismatic structure, etc., and the present invention does not limit this. Furthermore, the cylinder body 1 and the piston body 21 may be made of various materials, for example, the cylinder body 1 and the piston body 21 may be made of metal materials such as iron or alloy materials such as steel, as long as they can meet the strength requirements of the compressor, and the present invention does not limit this. Further, please refer to Figures 1 to 4 The cross-sectional area of the first-stage cavity 31 and the second-stage cavity 32 refers to the direction perpendicular to the moving direction of the piston body 21. For example, if the moving direction of the piston body 21 is left and right, the cross-sectional area of the first-stage cavity 31 and the second-stage cavity 32 is the cross-sectional area of the first-stage cavity 31 and the second-stage cavity 32 in the front-to-back direction.
[0042] Furthermore, in order to enable the second-stage chamber 32 to continue to compress the gas compressed by the first-stage chamber 31, the volume of the second-stage chamber 32 needs to be smaller than the volume of the first-stage chamber 31, and the movable strokes of the two ends of the piston body 21 in the cylinder body 1 are the same. To this end, in the present embodiment, a convex portion is provided at one end of the piston body 21, and the convex portion, one end of the piston body 21 and one end of the cylinder body 1 jointly define the second-stage chamber 32, so that the cross-sectional area of the first-stage chamber 31 is larger than the cross-sectional area of the second-stage chamber 32. In this way, by providing the convex portion to cooperate with the piston body 21 and the cylinder body 1, the first-stage chamber 31 with a larger cross-sectional area and the second-stage chamber 32 with a smaller cross-sectional area are formed at the two ends of the piston body 21, so that the volume of the second-stage chamber 32 is smaller than the volume of the first-stage chamber 31, so that the second-stage chamber 32 can continue to compress the gas compressed by the first-stage chamber 31.
[0043] In some embodiments of the utility model, the convex portion includes a piston rod 22 connected to the piston body 21, and the piston rod 22 is driven and connected to the driving structure 4. In this way, by setting the piston rod 22, the piston body 21 can be connected to the driving structure 4 so that the driving structure 4 can drive the piston body 21 to reciprocate, and it can also cooperate with the piston body 21 and the cylinder body 1 to reduce the volume of the second-stage chamber 32, so that the second-stage chamber 32 can continue to compress the gas compressed by the first-stage chamber 31.
[0044] The existing single-cylinder compressor does not need compression on the side close to the piston rod 22, that is, when the first-stage chamber 31 is inhaling, the second-stage chamber 32 does not need compression, so the piston rod 22 and the piston body 21 are usually hingedly connected, and the piston rod 22 swings under the drive of the drive structure 4 to push the piston body 21 to reciprocate in a straight line. However, this method will make the second-stage chamber 32 difficult to seal, and is only suitable for the situation where the second-stage chamber 32 does not need compression. The second-stage chamber 32 of the utility model needs to continue to compress the gas compressed by the first-stage chamber 31. For this reason, in this embodiment, the piston rod 22 reciprocates along a straight line. In this way, the piston rod 22 adopts a linear movement to prevent the piston rod 22 from swinging, so as to reduce the difficulty of sealing the second-stage chamber 32, thereby helping to improve the sealing of the second-stage chamber 32.
[0045] Since the existing compressors usually use a crankshaft 41 connecting rod structure to drive the piston to reciprocate linearly, in this embodiment, the driving structure 4 includes a crankshaft 41 and a transmission structure 42, the crankshaft 41 includes a rotating part that is eccentrically rotated, and the transmission structure 42 is arranged between the rotating part and the piston rod 22, so as to convert the rotation of the rotating part into the linear movement of the piston rod 22. In this way, by setting the transmission structure 42, the eccentric rotation of the rotating part is converted into the linear motion of the piston rod 22, and the eccentric revolution of the rotating part is used to drive the piston rod 22 to move, which can not only make the piston body 21 reciprocate linearly, but also make the compressor driveable by the existing driving device, which can reduce the modification cost of the compressor on the one hand, and quickly realize industrialization on the other hand. Of course, in other embodiments, there are many types of driving structures 4 that drive the piston rod 22 to move linearly, for example, the driving structure 4 can be a driving cylinder, or a driving oil cylinder, etc., and the utility model does not limit this.
[0046] In some embodiments of the utility model, the transmission structure 42 includes a roller sleeve 421 mounted on the rotating part, the roller sleeve 421 can rotate relative to the rotating part, and its circumferential side is hingedly connected to the piston rod 22. When the rotating part revolves eccentrically, the roller sleeve 421 and the crankshaft 41 rotate relative to each other, so that the position of the connection between the roller sleeve 421 and the piston rod 22 remains unchanged in a direction perpendicular to the piston body 21. In this way, by setting the roller sleeve 421, when the rotating part rotates eccentrically, the movement of the rotating part in the direction perpendicular to the piston body 21 is absorbed, so that the crankshaft 41 can drive the piston rod 22 to reciprocate in a straight line.
[0047] It should be noted that the rolling sleeve 421 can be made of a variety of materials. For example, the rolling sleeve 421 can be made of metal materials such as iron, or alloy materials such as steel. As long as it can meet the strength requirements of the compressor, the present invention does not impose any limitation on this.
[0048] It should also be noted that there are multiple transmission structures 42. In another embodiment, the transmission structure 42 includes a connecting rod, and the two ends of the connecting rod are respectively hinged to the rotating part and the piston rod 22. In this way, by providing the connecting rod, the movement of the rotating part in a direction perpendicular to the piston body 21 is absorbed, so that the crankshaft 41 can drive the piston rod 22 to reciprocate in a straight line. However, this method will increase the distance between the crankshaft 41 and the piston rod 22, thereby increasing the size of the compressor.
[0049] In some embodiments of the utility model, a slot 51 is provided on the circumferential side of the roller sleeve 421, and correspondingly, the piston rod 22 is provided with a protrusion 52 that cooperates with the slot 51. In this way, by providing the mutually cooperating slots 51 and the protrusions 52, the piston rod 22 can be hingedly connected to the roller sleeve 421, which is convenient for processing and manufacturing and convenient for assembly.
[0050] It should be noted that there are various ways of articulating the roller sleeve 421 and the piston rod 22. In other embodiments, the roller sleeve 421 is protruding with two mounting arms, each of which is provided with a rotating hole. Correspondingly, both ends of the piston rod 22 are provided with a rotating shaft, and each of the rotating shafts is passed through the corresponding rotating hole. In this way, the roller sleeve 421 can be articulated with the piston rod 22 by setting the rotating shafts and rotating holes that cooperate with each other. However, this structure is relatively complicated, which will increase both the processing cost and the difficulty of assembly.
[0051] In some embodiments of the present invention, the slot width of the slot 51 is D1, and the maximum thickness of the protrusion 52 is D2, wherein D2 / 2≤D1≤2D2 / 3. Since the larger the slot of the slot 51, the worse the locking of the protrusion 52 by the slot 51, the larger the movable range of the roller sleeve 421. Conversely, the better the locking of the protrusion 52 by the slot 51, the smaller the movable range of the roller sleeve 421. Therefore, D2 / 2≤D1≤2D2 / 3, which enables the roller sleeve 421 to lock the piston rod 22 to prevent the roller sleeve 421 from detaching from the piston rod 22, and ensures the movable range of the roller sleeve 421 to prevent the movable stroke of the piston body 21 from being restricted by the roller sleeve 421.
[0052] In some embodiments of the utility model, the piston rod 22 is provided with an accommodation groove 221 for the edge of the slot 51 to avoid and accommodate. Thus, by providing the accommodation groove 221, the range of motion of the roller sleeve 421 is expanded, so that when the roller sleeve 421 reaches the rotation limit, the piston body 21 has not yet reached the preset position, thereby preventing the movable stroke of the piston body 21 from being restricted by the roller sleeve 421. Further, two accommodation grooves 221 are provided, and the two accommodation grooves 221 are respectively provided on both sides of the piston rod 22. Thus, by providing the two accommodation grooves 221, the movable limits of the roller sleeve 421 on both sides of the piston rod 22 are expanded.
[0053] In some embodiments of the present invention, the piston body 21 and the piston rod 22 are integrally formed. In this way, the integrally formed setting can not only improve the connection strength between the piston rod 22 and the piston body 21, but also reduce the assembly process of the piston body 21 and the piston rod 22, which helps to improve the assembly efficiency of the compressor. Of course, in other embodiments, the piston body 21 and the piston rod 22 can also be separately formed, and the present invention does not limit this.
[0054] In some embodiments of the utility model, a connecting air passage 11 connecting the first exhaust hole 312 and the second air inlet hole 321 is provided in the cylinder body 1. Thus, by providing the connecting air passage 11, the cylinder body 1 can be directly connected to the first stage chamber 31 and the second stage chamber 32, which can not only improve the sealing performance of the compressor, but also avoid the need for additionally providing a connecting structure connecting the first stage chamber 31 and the second stage chamber 32, thereby saving subsequent assembly steps and thus helping to improve the assembly efficiency of the compressor.
[0055] It should be noted that there are various ways to connect the first exhaust hole 312 and the second air inlet hole 321. In another embodiment, the compressor further includes a connecting pipe, and both ends of the connecting pipe are connected to the first exhaust hole 312 and the second air inlet hole 321 respectively.
[0056] The working process of the compressor will be described below in combination with the above embodiments:
[0057] See also Figure 1 , the piston body 21 is at the end of the cylinder body 1 facing the piston rod 22, at this time, the first air inlet 311 and the second air outlet 322 begin to close, the second air inlet 321 begins to open, the first air outlet 312 closes, the first stage chamber 31 ends suction, and the second stage chamber 32 ends exhaust;
[0058] See also Figure 2 , the piston body 21 moves toward the end of the cylinder body 1 away from the piston rod 22, at this time, the first air inlet 311, the first air outlet 312 and the second air outlet 322 are all closed, the second air inlet 321 is opened, the first stage chamber 31 is in the compression process, and the second stage chamber 32 is in the suction process to inhale the gas compressed by the first stage chamber 31;
[0059] See also Figure 3, the piston body 21 is at the end of the cylinder body 1 away from the piston rod 22, at this time, the first air inlet hole 311 begins to open, the second air inlet hole 321 begins to close, the first exhaust hole 312 and the second exhaust hole 322 are closed, the first stage chamber 31 is at the end of exhaust, and the second stage chamber 32 is at the end of suction;
[0060] See also Figure 4 The piston body 21 moves toward the cylinder body 1 toward one end of the piston rod 22. At this time, the first air inlet hole 311 is opened, the first exhaust hole 312, the second exhaust hole 322 and the second air inlet hole 321 are closed, the first stage chamber 31 is in the suction process, and the second stage chamber 32 is in the compression process.
[0061] The utility model also proposes a refrigerator, which includes the above-mentioned compressor. The specific structure of the compressor refers to the above-mentioned embodiment. Since the refrigerator adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.
[0062] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. A compressor, characterized in that: include: Cylinder body; The piston structure comprises a piston body which is installed in the cylinder body for linear reciprocating motion; as well as, A driving structure, driving the piston body to reciprocate; A first-stage cavity and a second-stage cavity are defined between the two ends of the piston body corresponding to the two ends of the cylinder body, wherein the cross-sectional area of the first-stage cavity is set to be larger than the cross-sectional area of the second-stage cavity, and the cylinder body is provided with a first air inlet hole and a first exhaust hole connected to the first-stage cavity, and a second air inlet hole and a second exhaust hole connected to the second-stage cavity, and the first exhaust hole is connected to the second air inlet hole.
2. The compressor according to claim 1, characterized in that One end of the piston body is provided with a convex portion, and the convex portion, one end of the piston body and one end of the cylinder body jointly define the second stage cavity, so that the cross-sectional area of the first stage cavity is larger than the cross-sectional area of the second stage cavity.
3. The compressor according to claim 2, characterized in that The convex portion includes a piston rod connected to the piston body, and the piston rod is drivingly connected to the driving structure.
4. The compressor according to claim 3, characterized in that The piston rod reciprocates along a straight line.
5. The compressor according to claim 4, characterized in that The driving structure comprises: A crankshaft including a rotating portion arranged eccentrically for rotation; and The transmission structure is arranged between the rotating part and the piston rod, and is used for converting the rotation of the rotating part into the linear movement of the piston rod.
6. The compressor according to claim 5, characterized in that The transmission structure comprises a roller sleeve sleeved on the rotating part, the roller sleeve can rotate relative to the rotating part, and the peripheral side portion of the roller sleeve is hingedly connected to the piston rod.
7. The compressor according to claim 6, characterized in that A clamping groove is provided on the peripheral side of the rolling sleeve, and correspondingly, the piston rod is provided with a clamping protrusion matched with the clamping groove.
8. The compressor according to claim 7, characterized in that The piston rod is provided with an accommodation groove for accommodating the edge of the clamping groove.
9. The compressor according to claim 3, characterized in that The piston body and the piston rod are integrally formed.
10. The compressor according to claim 1, characterized in that The cylinder body is provided with a communicating air passage communicating with the first exhaust hole and the second intake hole.
11. A refrigerator, characterized in that: Comprising the compressor according to any one of claims 1 to 10.