Pump body assembly, fluid machinery, and heat exchange device

Abstract

Provided in the present application are a pump body assembly, a fluid machinery and a heat exchange device. The pump body assembly comprises: a first cylinder and a second cylinder, a partition plate being provided between the first cylinder and the second cylinder; a third cylinder, which has a volume smaller than both the volume of the first cylinder and the volume of the second cylinder; a first flange and a second flange, the first cylinder and the second cylinder being located between the first flange and the second flange; a first cover plate, the third cylinder being located between the second flange and the first cover plate; and a second cover plate, which is located between the second flange and the third cylinder, a first exhaust chamber of the second cylinder being formed between the second cover plate and the second flange. The present application solves the problem of limited miniaturization design of cylinders in a fluid machinery in the related art.

Description

Pump body components, fluid machinery and heat exchange equipment

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411585194.6, filed on November 7, 2024, entitled "Pump Body Assembly, Fluid Machinery and Heat Exchange Equipment", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of heat exchange equipment technology, and more specifically, to a pump assembly, fluid machinery, and heat exchange equipment. Background Technology

[0004] With societal progress and the development of heat exchange technology, the coupling of fluid machinery, such as compressors, with other functions and technologies has become a development trend in the field of heat exchange equipment, such as two-stage compression, three-stage compression, single-stage gas injection, and two-stage gas injection. These functions often require multi-cylinder, more complex compressors to achieve the desired results, and related technologies include single-cylinder compressors, two-cylinder compressors, three-cylinder compressors, and multi-cylinder compressors with three or more cylinders.

[0005] However, the aforementioned multi-cylinder rotary compressor has the following problems. Each eccentric part and roller is housed within a cylinder chamber formed in the inner diameter of the cylinder, resulting in eccentric rotation. Compared to single-cylinder and twin-cylinder compressors, the distance between the upper and lower flanges is larger, making the crankshaft prone to vibration. This leads to lower reliability and higher vibration and noise in multi-cylinder compressors. Furthermore, the self-aligning assembly process of the central cylinder is complex, hindering compressor assembly. In addition, to consider assembly relationships and avoid affecting the efficiency of the larger cylinders, multi-cylinder compressors cannot appropriately adjust the volume of the smaller cylinders to achieve miniaturization and high efficiency. This results in higher power consumption from friction pairs within the cylinders, impacting the compressor's energy efficiency.

[0006] Application content

[0007] The main objective of this application is to provide a pump body assembly, fluid machinery, and heat exchange equipment to solve the problem of limited miniaturization design of cylinders in fluid machinery in related technologies.

[0008] To achieve the above objectives, according to a first aspect of this application, a pump body assembly is provided, comprising: a first cylinder and a second cylinder, wherein a partition is disposed between the first cylinder and the second cylinder; a third cylinder, wherein the volume of the third cylinder is smaller than the volume of the first cylinder and the volume of the second cylinder; a first flange and a second flange, wherein the first cylinder and the second cylinder are located between the first flange and the second flange; a first cover plate, wherein the third cylinder is located between the second flange and the first cover plate; and a second cover plate, wherein the second cover plate is located between the second flange and the third cylinder, wherein a first exhaust chamber of the second cylinder is formed between the second cover plate and the second flange.

[0009] In some implementations, the volume V1 of the first cylinder, the volume V2 of the second cylinder, and the volume V3 of the third cylinder satisfy the following condition: 0.03 ≤ V3 / (V1+V2) ≤ 0.15.

[0010] In some embodiments, the volume V2 of the second cylinder, the minimum cross-sectional area S2 of the intake passage of the second cylinder, the volume V3 of the third cylinder, and the minimum cross-sectional area S3 of the intake passage of the third cylinder satisfy the following condition: (V3 / S3) / (V2 / S2)≤1.5.

[0011] In some embodiments, the intake pressure of the third cylinder is greater than the intake pressure of the first cylinder and the intake pressure of the second cylinder.

[0012] In some embodiments, the pump body assembly further includes a crankshaft, which includes a main body, a first expanding section, a second expanding section, and a reducing section. The outer periphery of the first expanding section and the outer periphery of the second expanding section extend beyond the outer periphery of the main body, while the outer periphery of the reducing section does not extend beyond the outer periphery of the main body. The first expanding section, the second expanding section, and the reducing section are eccentrically arranged in the axial direction of the main body. The first expanding section and the second expanding section are located inside the first cylinder and the second cylinder, respectively, while the reducing section is located inside the third cylinder, so that they participate in the compression process during crankshaft rotation.

[0013] In some embodiments, the pump body assembly further includes a first roller, a second roller, and a third roller, the first roller and the second roller being housed in a first cylinder and a second cylinder, respectively, and the third roller being housed in a third cylinder. The first expansion section and the second expansion section drive the first roller and the second roller to move, respectively, and the reduction section drives the third roller to move.

[0014] In some embodiments, the first expansion section and the second expansion section are eccentrically arranged relative to the main body in opposite directions; and / or the second expansion section and the reduction section are eccentrically arranged relative to the main body in the same direction.

[0015] In some embodiments, the pump body assembly has a third intake port communicating with the inner cavity of the third cylinder, wherein the third intake port is disposed on the third cylinder; or the third intake port is disposed on the first cover plate; or the third intake port is disposed on the second cover plate.

[0016] In some embodiments, the reduced diameter section is located at the bottom end of the crankshaft, the first flange is located above the second flange, and the upper end face of the first cylinder is sealed to the first flange (60), the lower end face of the second cylinder is sealed to the second flange, the upper end face of the third cylinder is sealed to the second cover plate, and the lower end face of the third cylinder is sealed to the first cover plate.

[0017] In some embodiments, the pump body assembly further includes a third cover plate located on the side of the first cover plate away from the third cylinder, and the third cover plate and the first cover plate form a second exhaust chamber for the third cylinder.

[0018] In some embodiments, the pump assembly further includes a muffler disposed outside the first flange for silencing the first cylinder; and / or the first exhaust chamber is a muffler chamber for the second cylinder.

[0019] According to a second aspect of this application, a fluid machine is provided, including the pump body assembly described above.

[0020] According to a third aspect of this application, a heat exchange device is provided, including the fluid machinery described above.

[0021] Using the technical solution of this application, the pump body assembly includes a first cylinder, a second cylinder, a third cylinder, a first flange and a second flange, a first cover plate and a second cover plate. A partition is provided between the first cylinder and the second cylinder. The volume of the third cylinder is smaller than the volumes of the first cylinder and the second cylinder. The first cylinder and the second cylinder are located between the first flange and the second flange, the third cylinder is located between the second flange and the first cover plate, and the second cover plate is located between the second flange and the third cylinder. The second cover plate and the second flange form the first exhaust chamber of the second cylinder. In this way, the pump body assembly is configured as a large and small cylinder assembly. Simultaneously, by placing the first and second cylinders between two flanges and the third cylinder outside the two flanges, the pump body assembly becomes compact, significantly reducing the overall cylinder volume and achieving cylinder miniaturization. Furthermore, by forming the first exhaust chamber of the second cylinder between the second cover plate and the second flange, the back pressure of the second cylinder's exhaust is ensured, preventing exhaust from entering the oil sump and causing excessive mixing of refrigerant and oil, increasing exhaust resistance and oil content, and affecting the pump body assembly performance. This solves the problem of limited cylinder miniaturization design in related fluid machinery. In addition, the smaller cylinder volume significantly reduces the power consumption generated by internal friction pairs, thereby improving energy efficiency. This achieves high energy efficiency in the fluid machinery while realizing miniaturization. The placement of the third cylinder outside the two flanges reduces the span between them, improving crankshaft reliability. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0023] Figure 1 shows a schematic diagram of the fluid machinery in Embodiment 1 of this application;

[0024] Figure 2 shows a schematic diagram of the crankshaft structure in a specific embodiment of this application;

[0025] Figure 3 shows a schematic diagram of the fluid machinery in Embodiment 2 of this application;

[0026] Figure 4 shows a schematic diagram of the fluid machinery in Embodiment 3 of this application;

[0027] Figure 5 shows a schematic diagram of the fluid machinery in Embodiment 4 of this application.

[0028] The above-mentioned figures include the following reference numerals: 10, first cylinder; 11, first intake port; 20, second cylinder; 21, second intake port; 30, third cylinder; 31, third intake port; 40, crankshaft; 41, main body; 42, first expansion section; 43, second expansion section; 44, reduction section; 50, first roller; 60, second roller; 70, third roller; 80, first flange; 90, second flange; 100, first cover plate; 110, second cover plate; 111, third cover plate; 120, partition plate; 130, first exhaust chamber; 131, second exhaust chamber; 140, muffler; 150, motor assembly; 160, first intake pipe; 170, second intake pipe; 180, distributor; 190, housing. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0030] To address the limitation in miniaturization design of cylinders in fluid machinery in related technologies, this application provides a pump body assembly, a fluid machinery, and a heat exchange device. The fluid machinery described below includes the pump body assembly described below.

[0031] Example 1

[0032] As shown in Figures 1 to 5, the pump body assembly includes a first cylinder 10, a second cylinder 20, a third cylinder 30, a first flange 80, a second flange 90, a first cover plate 100, and a second cover plate 110. A partition 120 is provided between the first cylinder 10 and the second cylinder 20. The volume of the third cylinder 30 is smaller than the volumes of the first cylinder 10 and the second cylinder 20. The first cylinder 10 and the second cylinder 20 are located between the first flange 80 and the second flange 90. The third cylinder 30 is located between the second flange 90 and the first cover plate 100. The second cover plate 110 is located between the second flange 90 and the third cylinder 30, and the second cover plate 110 and the second flange 90 form the first exhaust chamber 130 of the second cylinder 20.

[0033] By configuring the pump body assembly as a large and small cylinder structure, and placing the first cylinder 10 and the second cylinder 20 between the two flanges, while placing the third cylinder 30 outside the two flanges, the pump body assembly structure becomes compact, significantly reducing the overall volume of the cylinders and achieving a miniaturized cylinder design. Furthermore, by forming the first exhaust chamber 130 of the second cylinder 20 between the second cover plate 110 and the second flange 90, the back pressure of the exhaust from the second cylinder 20 can be guaranteed, preventing exhaust from entering the oil sump and causing excessive mixing of refrigerant and oil, increasing exhaust resistance and oil content in the exhaust, and affecting the performance of the pump body assembly. In addition, due to the smaller cylinder volume, the power consumption generated by the friction pairs inside the cylinder is greatly reduced, thereby improving energy efficiency. This achieves high energy efficiency in the fluid machinery while realizing a miniaturized design. Placing the third cylinder outside the two flanges reduces the span between the two flanges, improving the reliability of the crankshaft 40.

[0034] As shown in Figures 1 to 5, the pump assembly also includes a crankshaft 40. The crankshaft 40 includes a main body 41, a first expanding section 42, a second expanding section 43, and a reducing section 44. The outer periphery of the first expanding section 42 and the outer periphery of the second expanding section 43 extend beyond the outer periphery of the main body 41, while the outer periphery of the reducing section 44 does not extend beyond the outer periphery of the main body 41. The first expanding section 42, the second expanding section 43, and the reducing section 44 are eccentrically arranged in the axial direction of the main body 41. The first expanding section 42 and the second expanding section 43 are located inside the first cylinder 10 and the second cylinder 20, respectively, while the reducing section 44 is located inside the third cylinder 30, so that they participate in the compression process during the rotation of the crankshaft 40.

[0035] As shown in Figures 1 and 3 to 5, the pump body assembly also includes a silencer 140, which is located on the outside of the first flange 80 and is used to silence the first cylinder 10. It can be understood that the outside of the first flange 80 is the side furthest from the second flange 90.

[0036] Furthermore, in this embodiment, the first exhaust chamber 130 is also the muffler chamber of the second cylinder 20. That is, the first exhaust chamber 130 is the exhaust muffler chamber of the second cylinder 20. With the above arrangement, the muffler corresponding to the second cylinder 20 can be eliminated, simplifying the pump body structure.

[0037] In this embodiment, the intake pressure of the third cylinder 30 is greater than the intake pressure of the first cylinder 10 and the intake pressure of the second cylinder 20.

[0038] It is understood that the pump assembly in this embodiment is a three-cylinder compression structure in the form of large and small cylinders, with the first cylinder 10 and the second cylinder 20 being large cylinders and the third cylinder 30 being a small cylinder.

[0039] As shown in Figures 1 to 4, in this embodiment, the first cover plate 100 is located at the bottom of the pump body assembly, and correspondingly, the reduced diameter section 44 is located at the bottom end of the crankshaft 40, that is, the reduced diameter section 44 is located at the end of the short shaft of the crankshaft 40. The first flange 80 is located above the second flange 90, and the upper end face of the first cylinder 10 is sealed to the first flange 80, the lower end face of the second cylinder 20 is sealed to the second flange 90, the upper end face of the third cylinder 30 is sealed to the second cover plate 110, and the lower end face of the third cylinder 30 is sealed to the first cover plate 100. The first flange 80 and the second flange 90 seal the first cylinder 10 and the second cylinder 20, while the first cover plate 100 and the second cover plate 110 seal the third cylinder 30, thus achieving independent operation of the large and small cylinders. Simultaneously, the crankshaft 40 passes through the first cylinder 10, the second cylinder 20, and the third cylinder 30. The first expansion section 42, the second expansion section 43, and the reduction section 44 respectively drive the first roller 50 in the first cylinder 10, the second roller 60 in the second cylinder 20, and the third roller 70 in the third cylinder 30, effectively achieving independent parallel compression of the large and small cylinders. Alternatively, the first cover plate 100 can be located at the top of the pump body assembly, with the corresponding reduction section 44 located at the top of the crankshaft 40, i.e., the first flange 80 located below the second flange 90, which can be selected according to actual needs.

[0040] As shown in Figure 2, in this embodiment, the first diameter-expanding section 42 and the second diameter-expanding section 43 are eccentrically arranged relative to the main body 41 in opposite directions. The second diameter-expanding section 43 and the diameter-reducing section 44 are eccentrically arranged relative to the main body 41 in the same direction.

[0041] It should be noted that on the vertical projection plane of the crankshaft 40, the axes of the main body 41, the first expansion section 42, the second expansion section 43, and the reduction section 44 are projected respectively. The same-direction eccentric setting means that, with the axis projection of the main body 41 as a reference, the axis projections of the second expansion section 43 and the reduction section 44 are located on the same side of the axis projection of the main body 41. The opposite eccentric setting means that the axis projections of the first expansion section 42 and the second expansion section 43 are located on both sides of the axis projection of the main body 41.

[0042] As shown in Figures 1 to 4, the pump body assembly also includes a first roller 50, a second roller 60, and a third roller 70. The first roller 50 and the second roller 60 are respectively housed in the first cylinder 10 and the second cylinder 20, and the third roller 70 is housed in the third cylinder 30. The first expansion section 42 and the second expansion section 43 drive the first roller 50 and the second roller 60 to move, respectively, and the reduction section 44 drives the third roller 70 to move.

[0043] Specifically, when the crankshaft 40 rotates, the first roller 50, the second roller 60, and the third roller 70 move within the first cylinder 10, the second cylinder 20, and the third cylinder 30, respectively. The movement of the rollers within the cylinders is a surface-to-surface contact. Since the first expansion section 42, the second expansion section 43, and the reduction section 44 are all eccentrically arranged, the first roller 50, the second roller 60, and the third roller 70 do not rotate on their own axis. Instead, the trajectory of their contact with the cylinders is an eccentric circle. This eccentric circle trajectory ensures that a crescent-shaped compression chamber always exists within the cylinder. At this time, the volume of the compression chamber is maximized, which can improve the efficiency of gas compression.

[0044] As shown in Figures 1, 2 to 4, the fluid machinery in this embodiment is a three-cylinder compression structure, namely, it has a first compression section, a second compression section, and a third compression section. The first compression section consists of a first flange 80, a first cylinder 10, a first roller 50, and a partition 120. The second compression section consists of a partition 120, a second cylinder 20, a second roller 60, and a second flange 90. The pump assembly also includes a first intake port 11, a second intake port 21, and a third intake port 31, which are respectively connected to the inner cavities of the first cylinder 10, the second cylinder 20, and the third cylinder 30. Two refrigerants are respectively separated from the lubricating oil in the heat exchange equipment system by the distributor 180, and enter the first cylinder 10 and the second cylinder 20 through the first intake pipe 160 and the first intake port 11, and the second intake pipe 170 and the second intake port 21 for compression. After one compression cycle, the refrigerant is discharged into the inner cavity of the fluid machinery. The third compression section consists of a second cover plate 110, a third cylinder 30, a third roller 70, and a first cover plate 100. Another refrigerant comes from the air conditioning system to the third intake pipe (not shown), enters the third cylinder 30 through the third intake port 31 for compression, and is discharged into the fluid machinery cavity. After mixing with the refrigerant compressed by the first and second compression sections, it is discharged from the fluid machinery into the heat exchange equipment system.

[0045] In this embodiment, the third intake port 31 is disposed on the third cylinder 30. Specifically, the third intake port 31 extends radially along the third cylinder 30, and is for radial intake, as shown in Figure 1.

[0046] In this embodiment, the volumes V1 of the first cylinder 10, V2 of the second cylinder 20, and V3 of the third cylinder 30 satisfy the following condition: 0.03 ≤ V3 / (V1+V2) ≤ 0.15. Through this configuration, the third cylinder 30 has a smaller volume, reducing the power consumption generated by the friction pairs inside the cylinder, thereby improving energy efficiency.

[0047] In this embodiment, the volume V2 of the second cylinder 20, the minimum cross-sectional area S2 of the intake channel of the second cylinder 20, the volume V3 of the third cylinder 30, and the minimum cross-sectional area S3 of the intake channel of the third cylinder 30 satisfy the following condition: (V3 / S3) / (V2 / S2)≤1.5. Specifically, the intake channel of the cylinder generally extends radially or axially from the inner wall surface of the cylinder to the outer wall surface or end face of the cylinder, and then connects with the intake pipe to achieve intake. Its cross-sectional area is not necessarily the same everywhere, and the minimum cross-sectional area determines the intake flow rate. Since the suction pressure of the third cylinder 30 is higher than that of the first cylinder 10 and the second cylinder 20, the suction density of the third cylinder 30 is lower than that of the first cylinder 10 and the second cylinder 20, and the volume of the third cylinder 30 is smaller than that of the first cylinder 10 and the second cylinder 20, the suction mass flow rate is very small. Therefore, when the above parameter range is met, the suction loss of the third cylinder 30 can be reduced, and the indicating efficiency of the fluid machinery can be improved.

[0048] This application also provides a fluid machine, including the pump assembly described above. In this embodiment, the fluid machine is a compressor.

[0049] As shown in Figures 1, 3, and 4, the fluid machinery also includes a motor assembly 150 and a housing 190. The motor assembly 150 is used to drive the crankshaft 40. Both the pump assembly and the motor assembly 150 are housed within the housing 190.

[0050] This application also provides a heat exchange device, including the aforementioned fluid machinery. In this embodiment, the heat exchange device is an air conditioner.

[0051] Example 2

[0052] The difference from Embodiment 1 is that the location of the third air intake 31 is different.

[0053] Specifically, as shown in Figure 3, the third air intake 31 is disposed on the first cover plate 100. The third air intake 31 first extends radially along the first cover plate 100, and then connects axially with the third cylinder 30 to achieve axial air intake.

[0054] Example 3

[0055] The difference from Embodiment 1 is that the location of the third air intake 31 is different.

[0056] Specifically, as shown in Figure 4, the third air intake 31 is disposed on the second cover plate 110. The third air intake 31 first extends radially along the second cover plate 110, and then connects axially with the third cylinder 30 to achieve axial air intake.

[0057] Example 4

[0058] The difference from Embodiment 1 is that the exhaust structure of the pump body assembly is different.

[0059] As shown in Figure 5, the pump body assembly also includes a third cover plate 111, which is located on the side of the first cover plate 100 away from the third cylinder 30. The third cover plate 111 and the first cover plate 100 form a second exhaust chamber 131 of the third cylinder 30.

[0060] From the above description, it can be seen that the embodiments of this application achieve the following technical effects: By configuring the pump body assembly as a large and small cylinder structure, and placing the first cylinder 10 and the second cylinder 20 between the two flanges, while placing the third cylinder 30 outside the two flanges, the pump body assembly structure becomes compact, significantly reducing the overall volume of the cylinders and achieving a miniaturized cylinder design. Furthermore, by forming the first exhaust chamber 130 of the second cylinder 20 between the second cover plate 110 and the second flange 90, the back pressure of the exhaust from the second cylinder 20 can be guaranteed, preventing exhaust from entering the oil sump and causing excessive mixing of refrigerant and oil, increasing exhaust resistance and oil content, and affecting the performance of the pump body assembly. In addition, due to the smaller cylinder volume, the power consumption generated by the friction pairs inside the cylinder is greatly reduced, thereby improving energy efficiency. This achieves both miniaturization and high energy efficiency in the fluid machinery. The placement of the third cylinder outside the two flanges reduces the span between them, improving the reliability of the crankshaft 40.

[0061] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0062] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0063] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0064] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0065] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0066] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0067] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0068] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A pump body assembly, characterized in that, include: A first cylinder (10) and a second cylinder (20), wherein a partition (120) is provided between the first cylinder (10) and the second cylinder (20); The third cylinder (30) has a volume smaller than that of the first cylinder (10) and the second cylinder (20); A first flange (80) and a second flange (90), wherein the first cylinder (10) and the second cylinder (20) are located between the first flange (80) and the second flange (90); The first cover plate (100) and the third cylinder (30) are located between the second flange (90) and the first cover plate (100); The second cover plate (110) is located between the second flange (90) and the third cylinder (30), and the second cover plate (110) and the second flange (90) form the first exhaust chamber (130) of the second cylinder (20).

2. The pump body assembly according to claim 1, characterized in that, The volume V1 of the first cylinder (10), the volume V2 of the second cylinder (20) and the volume V3 of the third cylinder (30) satisfy the following condition: 0.03≤V3 / (V1+V2)≤0.

15.

3. The pump body assembly according to claim 1, characterized in that, The volume V2 of the second cylinder (20), the minimum cross-sectional area S2 of the intake channel of the second cylinder (20), the volume V3 of the third cylinder (30), and the minimum cross-sectional area S3 of the intake channel of the third cylinder (30) satisfy the following condition: (V3 / S3) / (V2 / S2)≤1.

5.

4. The pump body assembly according to claim 1, characterized in that, The intake pressure of the third cylinder (30) is greater than that of the first cylinder (10) and the second cylinder (20).

5. The pump body assembly according to claim 1, characterized in that, The pump body assembly also includes a crankshaft (40), which includes a main body (41), a first expansion section (42), a second expansion section (43), and a reduction section (44). The outer periphery of the first expansion section (42) and the outer periphery of the second expansion section (43) extend beyond the outer periphery of the main body (41), while the outer periphery of the reduction section (44) does not extend beyond the outer periphery of the main body (41). The first expansion section (42), the second expansion section (43), and the reduction section (44) are eccentrically arranged in the axial direction of the main body (41). The first expansion section (42) and the second expansion section (43) are located inside the first cylinder (10) and the second cylinder (20), respectively, and the reduction section (44) is located inside the third cylinder (30) so as to participate in the compression process during the rotation of the crankshaft (40).

6. The pump body assembly according to claim 5, characterized in that, The pump body assembly further includes a first roller (50), a second roller (60), and a third roller (70). The first roller (50) and the second roller (60) are respectively housed in the first cylinder (10) and the second cylinder (20), and the third roller (70) is housed in the third cylinder (30). The first expansion section (42) and the second expansion section (43) drive the first roller (50) and the second roller (60) to move, respectively, and the reduction section (44) drives the third roller (70) to move.

7. The pump body assembly according to claim 5, characterized in that, The first diameter expansion section (42) and the second diameter expansion section (43) are eccentrically arranged in opposite directions relative to the main body (41).

8. The pump body assembly according to claim 5, characterized in that, The second diameter expansion section (43) and the diameter reduction section (44) are eccentrically arranged relative to the main body (41) in the same direction.

9. The pump body assembly according to claim 1, characterized in that, The pump assembly has a third intake port (31) communicating with the inner cavity of the third cylinder (30), and the third intake port (31) is disposed on the third cylinder (30).

10. The pump body assembly according to claim 1, characterized in that, The pump assembly has a third intake port (31) communicating with the inner cavity of the third cylinder (30), and the third intake port (31) is disposed on the first cover plate (100).

11. The pump body assembly according to claim 1, characterized in that, The pump assembly has a third intake port (31) communicating with the inner cavity of the third cylinder (30), and the third intake port (31) is disposed on the second cover plate (110).

12. The pump body assembly according to claim 5, characterized in that, The reduced diameter section (44) is located at the bottom end of the crankshaft (40), the first flange (80) is located above the second flange (90), and the upper end face of the first cylinder (10) is sealed to the first flange (80), the lower end face of the second cylinder (20) is sealed to the second flange (90), the upper end face of the third cylinder (30) is sealed to the second cover plate (110), and the lower end face of the third cylinder (30) is sealed to the first cover plate (100).

13. The pump body assembly according to claim 1, characterized in that, The pump assembly also includes a third cover plate (111), which is located on the side of the first cover plate (100) away from the third cylinder (30), and the third cover plate (111) and the first cover plate (100) form a second exhaust chamber (131) of the third cylinder (30).

14. The pump body assembly according to claim 1, characterized in that, The pump assembly also includes a silencer (140), which is disposed on the outside of the first flange (80) and is used to silence the first cylinder (10).

15. The pump body assembly according to claim 1, characterized in that, The first exhaust chamber (130) is the muffler chamber of the second cylinder (20).

16. A fluid machine, characterized in that, Includes the pump body assembly as described in any one of claims 1 to 15.

17. A heat exchange device, characterized in that, Includes the fluid machinery as described in claim 16.

18. The heat exchange device according to claim 17, characterized in that, The heat exchange equipment is an air conditioner.

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