Pump body structure, fluid machine and heat exchange equipment

Abstract

The invention provides a pump body structure, fluid machinery and heat exchange equipment, the pump body structure comprises a first air cylinder, a slip sheet and a crankshaft, the first air cylinder is provided with a first cavity, at least one part of the slip sheet is movably arranged in the first cavity, the crankshaft is provided with a first eccentric part, and the first eccentric part is rotatably arranged in the first cavity; a compression cavity is formed between at least one part of the outer wall face of the first eccentric part and the inner wall face of the first cavity, the first eccentric part is directly connected with the sliding piece in an abutting mode, and the curvature radius of the first eccentric part is smaller than the radius of other positions on the crankshaft. According to the pump body structure, the fluid machine and the heat exchange equipment, the problem that in the prior art, the miniaturization design of a small air cylinder in a fluid machine is limited can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field related to heat exchange equipment, and in particular to a pump body structure, a fluid machine and a heat exchange equipment. Background Art

[0002] In the prior art, heat exchange equipment is already very common. The heat exchange of existing heat exchange equipment is realized by the pump body assembly in the fluid machinery. The conventional design is mostly multi-cylinder forms such as large and small cylinders, double cylinders, and three cylinders. The above design methods all place the cylinder between the upper and lower flange supports. Taking the large and small cylinders as an example, in order to ensure the assembly relationship of the pump body, the diameter of the small cylinder and the diameter of the eccentric part must be larger than the short shaft diameter (short shaft support position). In order to ensure the reliability of the pump body, the short shaft diameter cannot be very small. At this time, the diameter of the small cylinder and the diameter of the eccentric part cannot be adjusted accordingly according to the actual situation, that is, the eccentric part diameter cannot be reduced as the displacement demand decreases. In order to consider the assembly relationship and to avoid affecting the efficiency of the second cylinder or the third cylinder, other multi-cylinder forms also cannot adjust the volume of the small cylinder to achieve miniaturization and high efficiency.

[0003] As can be seen from the above, there is a problem in the prior art that the miniaturization design of small cylinders in fluid machinery is limited. Summary of the invention

[0004] The main purpose of the present invention is to provide a pump body structure, a fluid machine and a heat exchange device to solve the problem of limited miniaturization design of small cylinders in the fluid machine in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a pump body structure is provided, which includes a first cylinder, the first cylinder having a first cavity; a vane, at least a portion of which is movably arranged inside the first cavity; and a crankshaft, the crankshaft having a first eccentric portion, the first eccentric portion being rotatably arranged inside the first cavity, a compression chamber being formed between at least a portion of an outer wall surface of the first eccentric portion and an inner wall surface of the first cavity, the first eccentric portion being in direct contact with the vane, and a radius of curvature at the first eccentric portion being smaller than a radius of curvature at other positions on the crankshaft.

[0006] Further, the first eccentric portion is located at an end portion of the crankshaft.

[0007] Furthermore, the crankshaft also has a second eccentric portion, the diameter of the second eccentric portion is larger than the diameter of the crankshaft at a position other than the first eccentric portion, and the pump body structure also includes a second cylinder, the second cylinder has a second cavity, and the second eccentric portion is accommodated in the second cavity.

[0008] Further, the volume V2 of the first cavity is less than or equal to 10% of the volume V1 of the second cavity; and / or the height ratio of the height H2 of the first eccentric portion and the height H1 of the second eccentric portion on the crankshaft satisfies (V2*R2^2) / (V1*R1^2); wherein V1 is the volume of the second cavity, V2 is the volume of the first cavity, R2 is the radius of the first cylinder, and R1 is the radius of the second cylinder; and / or the height dimension of the height H2 of the first eccentric portion in the axial direction of the crankshaft is not greater than (H1*R2^2) / (10*R1^2), wherein H1 is the height of the second eccentric portion, R2 is the radius of the first cylinder, and R1 is the radius of the second cylinder.

[0009] Furthermore, the crankshaft further comprises a main body portion, and a projection of the first eccentric portion on an axial cross section of the main body portion is located within an outer periphery of the main body portion.

[0010] Further, at least a portion of the outer periphery of the first eccentric portion overlaps with a portion of the outer periphery of the main body portion.

[0011] Furthermore, the outer peripheral surface of the first eccentric part includes a first section and a second section connected sequentially along the circumferential direction of the crankshaft, the first section overlaps with a part of the outer peripheral edge of the main body, the second section is located inside the outer peripheral edge of the main body, and a compression chamber is formed between the second section and the inner wall surface of the first cavity.

[0012] Furthermore, the radius of curvature of the first section is greater than the radius of curvature of the second section.

[0013] Further, the compression chamber includes an air inlet chamber and an air exhaust chamber, and the first eccentric portion has a first rotation position and a second rotation position. When the first eccentric portion is in the first rotation position, the second section abuts against the sliding vane, and an air inlet chamber is formed between the second section and the inner wall surface of the first cavity; when the first eccentric portion is in the second rotation position, the first section abuts against the sliding vane, and an air exhaust chamber is formed between the second section and the inner wall surface of the first cavity.

[0014] Furthermore, the axial height of the first eccentric portion is less than or equal to the axial height of the first cavity.

[0015] Furthermore, the pump body structure also includes a flange assembly arranged at one end of the first cylinder, the crankshaft also includes a main body, the diameter of the inner circumference of the first cylinder is the same as the diameter of the main body; and / or the diameter of the inner circumference of the first cylinder is the same as the diameter of the flange hole of the flange assembly.

[0016] Furthermore, the end surface of the sliding vane abutting against the crankshaft is an arc surface, and the curvature radius of the arc surface is twice the thickness of the sliding vane.

[0017] Furthermore, the pump body structure also includes a flange assembly and an end cover, the flange assembly includes a first flange, an end cover is provided at one end of the first cylinder, the first flange is provided at the other end of the first cylinder, the first flange has a flange hole connected to the first cavity, and the first eccentric portion passes through the flange hole and extends into the interior of the first cavity.

[0018] Further, the diameter of the end cover is smaller than the diameter of the first flange; and / or the diameter of the first cylinder is not larger than the diameter of the end cover.

[0019] Furthermore, the flange assembly also includes a second flange, the pump body structure also includes a second cylinder, the second cylinder has a second cavity, the second cylinder is arranged between the first flange and the second flange, the crankshaft passes through the second flange, the second cavity and the first flange in sequence, so that the first eccentric portion extends into the interior of the first cavity, and the first flange is arranged parallel to the second flange, so that the first cavity and the second cavity are two parallel cavities.

[0020] According to another aspect of the present invention, a fluid machine is provided, the fluid machine comprising the above-mentioned pump body structure.

[0021] According to another aspect of the present invention, a heat exchange device is provided, and the heat exchange device includes the above-mentioned fluid machinery.

[0022] Applying the technical solution of the present invention, the pump body structure includes a first cylinder, a vane and a crankshaft, the first cylinder having a first cavity, at least a portion of the vane being movably arranged inside the first cavity, the crankshaft having a first eccentric portion, the first eccentric portion being rotatably arranged inside the first cavity, a compression chamber being formed between at least a portion of the outer wall surface of the first eccentric portion and the inner wall surface of the first cavity, the first eccentric portion being in direct contact with the vane, and a radius of curvature at the first eccentric portion being smaller than a radius at other positions on the crankshaft.

[0023] From the above, it can be seen that the present application adopts the crankshaft to directly abut against the sliding vane, eliminates the roller to increase the volume of the first cavity, and improves the space utilization efficiency of the first cavity by eliminating the space occupied by the roller. The radius of curvature of the first eccentric part is smaller than the radius at other positions on the crankshaft. The first eccentric part adopts a diameter-reducing structure to reduce the space occupied by the eccentric part, thereby further improving the space utilization efficiency of the first cavity to solve the problem of limited internal space of the cylinder. The present application reduces the number of parts by eliminating the rollers, making the pump body structure simpler, reducing the cost of processes and materials, and reducing the original friction pairs such as the crankshaft and rollers, rollers and vanes, and rollers and cylinder inner walls. During the operation of the compressor, the temperature of the pump body can be reduced to a certain extent, the suction volume can be increased, the volumetric efficiency of the compressor can be improved, and the energy efficiency of the compressor can be improved; the adverse effects of the roller rotation and sliding friction are eliminated, the internal leakage loss is reduced, and the friction loss is reduced; in addition, since the crankshaft is driven to rotate by the motor during the operation of the pump body structure, the rotational torque of the crankshaft will be directly reflected in the mechanical contact, thereby eliminating the rotational transmission loss, reducing the power of the compressor during operation, improving the power transmission efficiency, and making the compression performance more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0025] Figure 1 A cross-sectional view showing the pump structure of the present invention;

[0026] Figure 2 A top view of the pump structure of the present invention is shown;

[0027] Figure 3 A structural schematic diagram of the leakage channel of the pump body structure of the present invention is shown.

[0028] The above drawings include the following reference numerals:

[0029] 10. First cylinder; 110. First cavity; 120. Compression chamber; 20. Sliding vane; 30. Crankshaft; 310. First eccentric portion; 320. Second eccentric portion; 40. End cover; 50. First flange; 60. Second cylinder; 70. Second flange; 80. Leakage channel. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0032] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0033] Embodiment 1

[0034] In order to solve the problem of limited miniaturization design of small cylinders in fluid machinery in the prior art, the present invention provides a pump body structure, which is applied inside a compressor and is connected to a motor drive inside the compressor.

[0035] like Figures 1 to 3 As shown, the pump body structure includes a first cylinder 10, a vane 20 and a crankshaft 30. The first cylinder 10 has a first cavity 110. At least a portion of the vane 20 is movably arranged inside the first cavity 110. The crankshaft 30 has a first eccentric portion 310. The first eccentric portion 310 is rotatably arranged inside the first cavity 110. A compression chamber 120 is formed between at least a portion of the outer wall surface of the first eccentric portion 310 and the inner wall surface of the first cavity 110. The first eccentric portion 310 is directly in contact with the vane 20, and the curvature radius at the first eccentric portion 310 is smaller than the radius at other positions on the crankshaft 30.

[0036] Specifically, the present application adopts the crankshaft 30 to directly abut the slide 20, eliminates the roller to increase the volume of the first cavity 110, and improves the space utilization efficiency of the first cavity 110 by eliminating the space occupied by the roller. The curvature radius of the first eccentric portion 310 is smaller than the radius at other positions on the crankshaft 30. The first eccentric portion 310 adopts a reduced diameter structure to reduce the space occupied by the eccentric portion, thereby further improving the space utilization efficiency of the first cavity 110 to solve the problem of limited internal space of the cylinder.

[0037] Furthermore, the present application reduces the number of parts by eliminating the rollers, making the pump body structure simpler, reducing the cost of processes and materials, and reducing the original friction pairs such as the crankshaft 30 and rollers, rollers and vanes 20, and rollers and cylinder inner walls. During the operation of the compressor, the temperature of the pump body can be reduced to a certain extent, the suction volume can be increased, the volumetric efficiency of the compressor can be improved, and the energy efficiency of the compressor can be improved; the adverse effects of roller self-rotation and sliding friction are eliminated, the internal leakage loss is reduced, and the friction loss is reduced; in addition, since the crankshaft 30 is driven by the motor to rotate during the operation of the pump body structure, the rotational torque of the crankshaft 30 will be directly reflected in the mechanical contact, thereby eliminating the rotational transmission loss, reducing the power of the compressor during operation, and improving the power transmission efficiency, and the compression performance is more efficient.

[0038] Furthermore, the first eccentric portion 310 is a concave eccentric structure formed on the crankshaft 30 by a cutting process, that is, the first eccentric portion 310 is formed on the crankshaft 30 by being concave.

[0039] Further, the first eccentric portion 310 is located at an end of the crankshaft 30 , and the first cylinder 10 is disposed at the end of the crankshaft 30 , so that the first cylinder 10 is formed as a rollerless cylinder located at the end of the crankshaft 30 .

[0040] It should be noted that the motor is drivingly connected to the crankshaft 30 , and the motor drives the crankshaft 30 to rotate.

[0041] In this embodiment, the crankshaft 30 further has a second eccentric portion 320, the diameter of which is greater than the diameter of the crankshaft 30 at a position other than the first eccentric portion 310, and the pump body structure further includes a second cylinder 60, the second cylinder 60 has a second cavity, and the second eccentric portion 320 is accommodated in the second cavity. The second eccentric portion 320 is a convex eccentric structure formed on the crankshaft 30, that is, the second eccentric portion 320 is formed by a protrusion formed on the crankshaft 30.

[0042] Furthermore, the volume V2 of the first cavity 110 is less than or equal to 10% of the volume V1 of the second cavity, thereby realizing that the second cylinder 60 with a large volume and the first cylinder 10 with a small volume form a parallel cylinder structure.

[0043] Furthermore, a height ratio of a height H2 of the first eccentric portion 310 and a height H1 of the second eccentric portion 320 on the crankshaft 30 satisfies (V2*R2^2) / (V1*R1^2); wherein V1 is the volume of the second cavity, V2 is the volume of the first cavity 110, R2 is the radius of the first cylinder 10, and R1 is the radius of the second cylinder 60.

[0044] The height of the first eccentric portion 310 and the height of the second eccentric portion 320 are set in association with the first cavity 110 , the second cavity, the radius of the first cylinder 10 , and the radius of the second cylinder 60 .

[0045] In this embodiment, the height H2 of the first eccentric portion 310 in the axial direction of the crankshaft 30 is not greater than (H1*R2^2) / (10*R1^2), where H1 is the height of the second eccentric portion 320, R2 is the radius of the first cylinder 10, and R1 is the radius of the second cylinder 60.

[0046] The ratio of the height of the first eccentric portion 310 to the height of the crankshaft 30 is set in association with the height of the second eccentric portion 320 , the radius of the first cylinder 10 , and the radius of the second cylinder 60 .

[0047] like Figures 1 to 3 As shown, the crankshaft 30 further includes a body portion, and a projection of the first eccentric portion 310 on an axial cross section of the body portion is located within the outer periphery of the body portion.

[0048] Specifically, along the axial direction of the crankshaft 30 , the projection of the first eccentric portion 310 is located inside the projection area of ​​the main body portion.

[0049] Furthermore, at least a portion of the outer periphery of the first eccentric portion 310 overlaps with a portion of the outer periphery of the main body, so that the projection of the first eccentric portion 310 and the projection of the main body are inscribed. Along the radial direction of the crankshaft 30, the compression chamber 120 is formed on one side of the relative position of the overlap area of ​​the first eccentric portion 310 and the main body.

[0050] In this embodiment, the outer peripheral surface of the first eccentric portion 310 includes a first section and a second section connected in sequence along the circumferential direction of the crankshaft 30, the first section overlaps with a part of the outer peripheral edge of the main body, the second section is located inside the outer peripheral edge of the main body, and a compression chamber 120 is formed between the second section and the inner wall surface of the first cavity 110. The first section and the main body are arranged with the same diameter, and the radius of the second section is smaller than the radius of the main body section.

[0051] In this embodiment, the radius of curvature of the first section is greater than the radius of curvature of the second section.

[0052] like Figures 1 to 3 As shown, the compression chamber 120 includes an intake chamber and an exhaust chamber, and the first eccentric portion 310 has a first rotation position and a second rotation position.

[0053] Specifically, when the first eccentric portion 310 is in the first rotation position, the second section abuts against the slide 20, and an air intake chamber is formed between the second section and the inner wall surface of the first cavity 110; when the first eccentric portion 310 is in the second rotation position, the first section abuts against the slide 20, and an air exhaust chamber is formed between the second section and the inner wall surface of the first cavity 110.

[0054] The first eccentric portion 310 rotates inside the first cavity 110 , thereby switching the first eccentric portion 310 between the first rotation position and the second rotation position, so as to realize the process of intake, compression and exhaust.

[0055] Furthermore, the axial height of the first eccentric portion 310 is less than or equal to the axial height of the first cavity 110. When the axial height of the first eccentric portion 310 is equal to the axial height of the first cavity 110, it is beneficial to increase the volume of the compression chamber 120; when the axial height of the first eccentric portion 310 is less than the axial height of the first cavity 110, it is beneficial to improve the overall strength of the crankshaft 30.

[0056] In this embodiment, the leakage channel 80 is formed between the main body, the outer surface of the first eccentric portion 310, and the inner wall of the first cylinder 10. It should be noted that the leakage channel 80 of the present application meets the design specifications and is small enough. The leakage channel 80 of the present application is no different from the leakage channel 80 before the roller is removed. Therefore, the internal compression structure after the roller is removed will not have the problem of air leakage or poor sealing.

[0057] Furthermore, the pump body structure also includes a flange assembly arranged at one end of the first cylinder 10, and the crankshaft 30 also includes a main body. The diameter of the inner circumference of the first cylinder 10 is the same as the diameter of the main body. At this time, the exhaust volume of the second cylinder 60 is the largest.

[0058] Furthermore, the diameter of the inner circumference of the first cylinder 10 is the same as the diameter of the flange hole of the flange assembly, wherein the diameter of the flange hole is the same as the diameter of the body portion.

[0059] In this embodiment, the end surface of the abutting end of the sliding vane 20 and the crankshaft 30 is an arc surface, and the curvature radius of the arc surface is twice the thickness of the sliding vane 20. This is to enhance the adaptability of the head of the sliding vane 20 to the diameter of the first eccentric portion 310 and the thickness of the sliding vane 20. In a specific implementation of this embodiment, the thickness of the sliding vane 20 is 3.181 mm, and the head of the sliding vane 20 is designed to be an arc with a diameter of 6.4 mm.

[0060] like Figures 1 to 3 As shown, the pump body structure also includes a flange assembly and an end cover 40, the flange assembly includes a first flange 50, the end cover 40 is provided at one end of the first cylinder 10, the first flange 50 is provided at the other end of the first cylinder 10, the first flange 50 has a flange hole connected to the first cavity 110, and the first eccentric portion 310 passes through the flange hole and extends into the interior of the first cavity 110.

[0061] Specifically, the end cover 40 is disposed at one end of the first cylinder 10 to seal the opening of the first cylinder 10 and support the first cylinder 10 and the crankshaft 30, and the first flange 50 is disposed at the other end of the first cylinder 10 to position the first cylinder 10 and perform a sealing function.

[0062] Furthermore, the diameter of the end cover 40 is smaller than the diameter of the first flange 50. The end cover 40 is used to seal one end opening of the first cylinder 10. The first flange 50 is arranged between the first cylinder 10 and the second cylinder 60. Since the volume of the second cylinder 60 is larger than the volume of the first cylinder 10, the diameter of the first flange 50 is larger than the diameter of the end cover 40.

[0063] In this embodiment, the diameter of the first cylinder 10 is not greater than the diameter of the end cover 40 , so that the end cover 40 can fully support the first cylinder 10 , thereby facilitating improving the stability of positioning of the first cylinder 10 .

[0064] like Figures 1 to 3 As shown, the flange assembly also includes a second flange 70, and the pump body structure also includes a second cylinder 60, the second cylinder 60 has a second cavity, and the second cylinder 60 is arranged between the first flange 50 and the second flange 70. The crankshaft 30 passes through the second flange 70, the second cavity and the first flange 50 in sequence, so that the first eccentric portion 310 extends into the interior of the first cavity 110, and the first flange 50 is arranged in parallel with the second flange 70, so that the first cavity 110 and the second cavity are two parallel cavities.

[0065] Among them, the second flange 70 is cooperated with the first flange 50 to be arranged at both ends of the second cylinder 60 to realize the positioning and installation of the second cylinder 60. At the same time, the first flange 50 and the end cover 40 position the first cylinder 10 to realize the first cylinder 10 and the second cylinder 60 to form a parallel cylinder structure, so that the first cavity 110 and the second cavity are two parallel cavities.

[0066] Embodiment 2

[0067] The present invention provides a fluid machinery, and the fluid machinery includes the pump body structure in the first embodiment.

[0068] Specifically, the fluid machine may be a compressor.

[0069] Embodiment 3

[0070] The present invention provides a heat exchange device, which includes the fluid machinery in the second embodiment.

[0071] Specifically, the heat exchange device may be an air conditioner.

[0072] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0073] 1. The present application adopts the crankshaft 30 to directly abut against the slide 20, and eliminates the roller to increase the volume of the first cavity 110. The space occupied by the roller is eliminated to improve the space utilization efficiency of the first cavity 110. The curvature radius of the first eccentric portion 310 is smaller than the radius at other positions on the crankshaft 30. The first eccentric portion 310 adopts a diameter reduction structure to reduce the space occupied by the eccentric portion, further improving the space utilization efficiency of the first cavity 110 to solve the problem of limited internal space of the cylinder.

[0074] 2. The present application reduces the number of parts by eliminating the rollers, making the pump body structure simpler, reducing the cost of processes and materials, and reducing the original friction pairs such as the crankshaft 30 and rollers, the rollers and the vanes 20, and the rollers and the inner walls of the cylinders. During the operation of the compressor, the temperature of the pump body can be reduced to a certain extent, the suction volume can be increased, the volumetric efficiency of the compressor can be improved, and the energy efficiency of the compressor can be improved; the adverse effects of the roller rotation and sliding friction are eliminated, the internal leakage loss is reduced, and the friction loss is reduced.

[0075] 3. Since the crankshaft 30 is driven by the motor to rotate during the operation of the pump body structure, the rotational torque of the crankshaft 30 will be directly reflected in the mechanical contact, thereby eliminating the rotational transmission loss, reducing the power of the compressor during operation, improving the power transmission efficiency, and making the compression performance more efficient.

[0076] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0077] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0078] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pump body structure, characterized in that: include: A first cylinder (10), the first cylinder (10) having a first cavity (110); a sliding plate (20), at least a portion of which is movably disposed inside the first cavity (110); A crankshaft (30), wherein the crankshaft (30) has a first eccentric portion (310), the first eccentric portion (310) is rotatably disposed inside the first cavity (110), a compression chamber (120) is formed between at least a portion of the outer wall surface of the first eccentric portion (310) and the inner wall surface of the first cavity (110), the first eccentric portion (310) is directly in contact with the slide (20), and the curvature radius at the first eccentric portion (310) is smaller than the curvature radius at other positions on the crankshaft (30).

2. The pump body structure according to claim 1, characterized in that: The first eccentric portion (310) is located at an end of the crankshaft (30).

3. The pump body structure according to claim 1, characterized in that: The crankshaft (30) also has a second eccentric portion (320), the diameter of which is greater than the diameter of a position on the crankshaft (30) other than the first eccentric portion (310), and the pump body structure also includes a second cylinder (60), the second cylinder (60) has a second cavity, and the second eccentric portion (320) is accommodated in the second cavity.

4. The pump structure according to claim 3, characterized in that: The volume V2 of the first cavity (110) is less than or equal to 10% of the volume V1 of the second cavity; and / or The height ratio of the height H2 of the first eccentric portion (310) and the height H1 of the second eccentric portion (320) on the crankshaft (30) satisfies (V2*R2^2) / (V1*R1^2); wherein V1 is the volume of the second cavity, V2 is the volume of the first cavity (110), R2 is the radius of the first cylinder (10), and R1 is the radius of the second cylinder (60); and / or The height H2 of the first eccentric portion (310) in the axial direction of the crankshaft (30) is not greater than (H1*R2^2) / (10*R1^2), wherein H1 is the height of the second eccentric portion (320), R2 is the radius of the first cylinder (10), and R1 is the radius of the second cylinder (60).

5. The pump structure according to claim 1, characterized in that: The crankshaft (30) further comprises a main body portion, and a projection of the first eccentric portion (310) on an axial cross section of the main body portion is located within an outer periphery of the main body portion.

6. The pump structure according to claim 5, characterized in that: At least a portion of the outer periphery of the first eccentric portion (310) overlaps with a portion of the outer periphery of the main body portion.

7. The pump structure according to claim 6, characterized in that: The outer peripheral surface of the first eccentric portion (310) includes a first section and a second section connected in sequence along the circumferential direction of the crankshaft (30), the first section overlaps with a portion of the outer peripheral edge of the main body, the second section is located inside the outer peripheral edge of the main body, and the compression chamber (120) is formed between the second section and the inner wall surface of the first cavity (110).

8. The pump structure according to claim 7, characterized in that: The radius of curvature of the first section is greater than the radius of curvature of the second section.

9. The pump structure according to claim 7, characterized in that: The compression chamber (120) comprises an air inlet chamber and an air outlet chamber, the first eccentric portion (310) has a first rotation position and a second rotation position, When the first eccentric portion (310) is in the first rotation position, the second section abuts against the sliding plate (20), and the air inlet cavity is formed between the second section and the inner wall surface of the first cavity (110); When the first eccentric portion (310) is in the second rotation position, the first section abuts against the sliding plate (20), and the exhaust cavity is formed between the second section and the inner wall surface of the first cavity (110).

10. The pump structure according to claim 1, characterized in that: An axial height of the first eccentric portion (310) is less than or equal to an axial height of the first cavity (110).

11. The pump structure according to any one of claims 1 to 10, characterized in that: The pump body structure further comprises a flange assembly arranged at one end of the first cylinder (10), and the crankshaft (30) further comprises a body portion. The diameter of the inner circumference of the first cylinder (10) is the same as the diameter of the main body; and / or The diameter of the inner circumference of the first cylinder (10) is the same as the diameter of the flange hole of the flange assembly.

12. The pump structure according to any one of claims 1 to 10, characterized in that: The end surface of the sliding plate (20) abutting against the crankshaft (30) is an arc surface, and the curvature radius of the arc surface is twice the thickness of the sliding plate (20).

13. The pump structure according to any one of claims 1 to 10, characterized in that: The pump body structure also includes a flange assembly and an end cover (40), wherein the flange assembly includes a first flange (50), wherein the end cover (40) is disposed at one end of the first cylinder (10), and the first flange (50) is disposed at the other end of the first cylinder (10), wherein the first flange (50) has a flange hole disposed in communication with the first cavity (110), and the first eccentric portion (310) penetrates the flange hole and extends into the interior of the first cavity (110).

14. The pump structure according to claim 13, characterized in that: The diameter of the end cover (40) is smaller than the diameter of the first flange (50); and / or The diameter of the first cylinder (10) is not greater than the diameter of the end cover (40).

15. The pump structure according to claim 13, characterized in that: The flange assembly also includes a second flange (70), and the pump body structure also includes a second cylinder (60), the second cylinder (60) has a second cavity, the second cylinder (60) is arranged between the first flange (50) and the second flange (70), the crankshaft (30) passes through the second flange (70), the second cavity and the first flange (50) in sequence, so that the first eccentric portion (310) extends into the interior of the first cavity (110), and the first flange (50) is arranged in parallel with the second flange (70), so that the first cavity (110) and the second cavity are two parallel cavities.

16. A fluid machine, characterized in that: The fluid machine comprises the pump body structure according to any one of claims 1 to 15.

17. A heat exchange device, characterized in that: The heat exchange equipment includes the fluid machinery according to claim 16.

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