Pump body assembly, fluid machine and heat exchange device

Abstract

This invention provides a pump assembly, fluid machinery, and heat exchange equipment, specifically an energy-saving heat exchange equipment. The pump assembly includes: a first cylinder and a second cylinder, with a first partition between them; the first exhaust port of the first cylinder is connected to the second intake port of the second cylinder; a third cylinder, the volume of which is smaller than that of the first and second cylinders; a first flange and a second flange, with the first and second cylinders located between them; a first cover plate located on the side of the second flange furthest from the first flange; and the third cylinder located between the second flange and the first cover plate. The third cylinder has a second air inlet for communication with a second enthalpy-increasing element of the fluid machinery. In response to the second enthalpy-increasing element inputting refrigerant at different pressures into the third cylinder through the second air inlet, the third cylinder may or may not participate in the compression process. This invention solves the problem of insufficient operational stability in existing heat exchange equipment.

Description

Technical Field

[0001] This invention relates to the field of heat exchange equipment technology, and more specifically, to a pump assembly, fluid machinery, and heat exchange equipment. Background Technology

[0002] In heat exchange equipment, the compressor is a core component, and its performance directly affects the system's energy efficiency and operational stability. Traditional single-stage compressors suffer from insufficient intake volume, excessively high exhaust temperature, and low heating efficiency under low-temperature conditions. To improve system performance, two-stage enthalpy-increasing compressors have been widely researched and applied. These compressors achieve segmented compression through intermediate gas injection, thereby enhancing the system's operational capability in low-temperature environments. However, existing two-stage enthalpy-increasing compressors have a fixed volumetric ratio, making it difficult to flexibly adjust the operating mode according to different operating conditions. This leads to decreased energy efficiency and insufficient operational stability of the heat exchange equipment under partial load or extreme environments.

[0003] As can be seen from the above, the existing technology has the problem of insufficient operational stability of heat exchange equipment. Summary of the Invention

[0004] The main objective of this invention is to provide a pump assembly, fluid machinery, and heat exchange equipment to solve the problem of insufficient operational stability of heat exchange equipment in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, a pump body assembly is provided, comprising: a first cylinder and a second cylinder, wherein a first partition is disposed between the first cylinder and the second cylinder, and a first exhaust port of the first cylinder is connected to a second intake port of the second cylinder; a third cylinder, the volume of the third cylinder being smaller than the volumes of the first cylinder and 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 first cover plate is located on the side of the second flange away from the first flange, and the third cylinder is located between the second flange and the first cover plate; the third cylinder has a second air inlet for communicating with a second enthalpy-increasing element of a fluid machine, wherein, in response to the second enthalpy-increasing element inputting refrigerant of different pressures into the third cylinder through the second air inlet, the third cylinder may or may not participate in the compression process.

[0006] Furthermore, the pump body assembly also includes a third roller and a third vane. The third roller is disposed inside the third cylinder, and the third cylinder has a third vane groove. The third vane is slidably disposed in the third vane groove. When the second enthalpy-increasing element inputs the first refrigerant into the third cylinder, the third vane abuts against the third roller, so that the third cylinder participates in the compression process. When the second enthalpy-increasing element inputs the second refrigerant into the third cylinder, the third vane disengages from the third roller, so that the third cylinder does not participate in the compression process. The pressure of the first refrigerant is less than the pressure of the second refrigerant.

[0007] Furthermore, the first flange and / or the first partition plate have an intermediate cavity, the first exhaust port of the first cylinder and the second intake port of the second cylinder are respectively connected to the intermediate cavity, the first cylinder has a first air supply port, and the first air supply port is respectively connected to the intermediate cavity and the first enthalpy increasing element of the fluid machinery.

[0008] Furthermore, the first flange has an intermediate cavity, and the pump body assembly also includes a second cover plate, with the intermediate cavity formed between the second cover plate and the first flange.

[0009] Furthermore, there are two first partitions, and an intermediate cavity is formed between the two first partitions.

[0010] Furthermore, the pump body assembly also includes a crankshaft, which includes a main body, a first expanding section, a second expanding section, and a reducing section. The outer peripheries of the first and second expanding sections 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.

[0011] Furthermore, the pump body assembly also includes a first roller, a second roller, and a third roller. The first roller and the second roller are respectively housed in the first cylinder and the second cylinder, and the third roller is housed in the 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.

[0012] Furthermore, the pump body assembly also includes a second partition, a third cylinder located between the first cover plate and the second partition, a reduced diameter section located at the bottom end of the crankshaft, a first flange located above the second flange, and the upper end face of the first cylinder is sealed to the first flange, 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 partition, and the lower end face of the third cylinder is sealed to the first cover plate.

[0013] Furthermore, the pump body assembly also includes a third roller and a third vane. The third roller is disposed in a third cylinder, and a vane differential pressure control assembly is disposed in the third cylinder to control the pressure difference between the head and tail of the third vane so that the third vane contacts or disengages from the third roller.

[0014] According to another aspect of the present invention, a fluid machine is provided, comprising a first enthalpy enhancer, a second enthalpy enhancer, and the aforementioned pump assembly, wherein the first enthalpy enhancer and the second enthalpy enhancer are respectively connected to a first air inlet of a first cylinder and a second air inlet of a third cylinder.

[0015] According to another aspect of the present invention, a heat exchange device is provided, comprising the fluid machinery described above.

[0016] Furthermore, the heat exchange equipment also includes a condenser and a flash evaporator. The condenser is connected to the pump body assembly through a first pipeline, and the flash evaporator is connected to the first enthalpy-increasing element through a second pipeline. The second enthalpy-increasing element is connected in parallel to the first pipeline through a third pipeline. An on / off valve is installed on the third pipeline. The second pipeline is connected to the third pipeline through a fourth pipeline, and a one-way valve is installed on the fourth pipeline. The opening direction of the one-way valve is from the second pipeline to the third pipeline, and the connection between the fourth pipeline and the third pipeline is closer to the second enthalpy-increasing element relative to the on / off valve.

[0017] The pump assembly of this invention includes a first cylinder, a second cylinder, a third cylinder, a first flange, a second flange, and a first cover plate. A first partition is provided between the first cylinder and the second cylinder. The first exhaust port of the first cylinder is connected to the second intake port of 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 first cover plate is located on the side of the second flange away from the first flange. The third cylinder is located between the second flange and the first cover plate. The third cylinder has a second air inlet for communication with a second enthalpy-increasing element of the fluid machinery. In response to the second enthalpy-increasing element inputting refrigerant at different pressures into the third cylinder through the second air inlet, the third cylinder participates in or... By not participating in the compression process, the first and second cylinders form a two-stage compression structure, while the third cylinder acts as a secondary parallel cylinder. By controlling whether the third cylinder participates in the compression process of the pump assembly, under normal operating conditions, the third cylinder participates in the compression process, thereby increasing the displacement of the secondary cylinder and increasing the volume ratio of the pump assembly. Under low-temperature operating conditions, the third cylinder does not participate in the compression process, thereby reducing the displacement of the secondary cylinder and decreasing the volume ratio of the pump assembly. This allows the pump assembly to automatically adjust the volume ratio according to different operating conditions, achieving dynamic adjustment of the volume ratio, thus achieving high-efficiency operation and energy saving, improving the operational stability and reliability of the heat exchange equipment, and solving the problem of insufficient operational stability of heat exchange equipment in existing technologies. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0019] Figure 1 A schematic diagram of the pump body assembly in a specific embodiment of the present invention is shown;

[0020] Figure 2 A schematic diagram of the crankshaft structure in a specific embodiment of the present invention is shown;

[0021] Figure 3 A cross-sectional view of the third cylinder under normal operating conditions is shown in a specific embodiment of the present invention.

[0022] Figure 4 A cross-sectional view of the third cylinder in a specific embodiment of the present invention under low-temperature conditions is shown.

[0023] Figure 5 A schematic diagram of the structure of a fluid machine according to another specific embodiment of the present invention is shown;

[0024] Figure 6 A cross-sectional view of the fluid machinery under normal operating conditions is shown in another specific embodiment of the present invention;

[0025] Figure 7 A cross-sectional view of the fluid machinery under cryogenic conditions in a specific embodiment of the present invention is shown;

[0026] Figure 8 A schematic diagram of the structure of a heat exchange device according to a specific embodiment of the present invention is shown;

[0027] Figure 9 It shows Figure 8 A magnified view of a section at point A in the middle;

[0028] Figure 10 A graph showing the volume ratio versus relative performance coefficient of a pump assembly in a specific embodiment of the present invention is shown.

[0029] The above figures include the following reference numerals:

[0030] 10. First cylinder; 11. First intake port; 12. First air supply port; 20. Second cylinder; 21. Second intake port; 30. Third cylinder; 31. Second air supply 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; 71. Third vane; 80. First flange; 81. First intermediate cavity; 90. Second flange; 100. First cover plate; 110. First 111. Second intermediate cavity; 120. Second partition; 130. First enthalpy-increasing element; 140. Second enthalpy-increasing element; 150. Second cover plate; 160. Liquid separator; 170. Inlet pipe; 180. Shell; 190. Exhaust pipe; 101. First pipeline; 102. Second pipeline; 103. Third pipeline; 104. Fourth pipeline; 105. On / off valve; 106. Check valve; 1000. Fluid machinery; 2000. Condenser; 3000. Flash evaporator; 4000. Evaporator. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] To address the limitations of miniaturized cylinder design in existing fluid machinery, this invention provides a pump assembly, fluid machinery, and a heat exchange device. The heat exchange device is an energy-saving device, specifically an energy-saving air conditioner, energy-saving refrigerator, etc., and can be applied in domestic or industrial applications. The fluid machinery described below includes the pump assembly described below.

[0033] like Figure 1 As shown, the pump assembly includes a first cylinder 10, a second cylinder 20, a third cylinder 30, a first flange 80, a second flange 90, and a first cover plate 100. A first partition 110 is provided between the first cylinder 10 and the second cylinder 20. The first exhaust port of the first cylinder 10 is connected to the second intake port 21 of 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 first cover plate 100 is located on the side of the second flange 90 away from the first flange 80, and the third cylinder 30 is located between the second flange 90 and the first cover plate 100. The third cylinder 30 has a second air inlet 31 for communication with the second enthalpy-enhancing element 140 of the fluid machinery. In response to the second enthalpy-enhancing element 140 inputting refrigerant at different pressures into the third cylinder 30 through the second air inlet 31, the third cylinder 30 may or may not participate in the compression process.

[0034] The technical solution of this application establishes a two-stage compression structure with the first cylinder 10 and the second cylinder 20. The third cylinder 30 serves as a second-stage parallel cylinder. By controlling whether the third cylinder 30 participates in or does not participate in the compression process of the pump assembly, under normal operating conditions, the third cylinder 30 participates in the compression process, thereby increasing the displacement of the second-stage cylinder and increasing the volume ratio of the pump assembly. Under low-temperature operating conditions, the third cylinder 30 does not participate in the compression process, thereby reducing the displacement of the second-stage cylinder and decreasing the volume ratio of the pump assembly. This allows the pump assembly to automatically adjust its volume ratio according to different operating conditions, achieving dynamic adjustment of the volume ratio, thus realizing efficient operation and energy saving, and improving the operational stability and reliability of the heat exchange equipment.

[0035] It is understood that the pump assembly in this embodiment is a three-cylinder, two-stage compression structure with large and small cylinders. The first cylinder 10 and the second cylinder 20 are large cylinders, and the third cylinder 30 is a small cylinder. 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.

[0036] In this embodiment, as Figures 1 to 2 As shown, 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 peripheries of the first expanding section 42 and 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.

[0037] In this embodiment, as Figure 2 As shown, the first diameter-expanding section 42 and the second diameter-expanding section 43 are eccentrically arranged in opposite directions relative to the main body 41. The second diameter-expanding section 43 and the diameter-reducing section 44 are eccentrically arranged in the same direction relative to the main body 41.

[0038] 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.

[0039] like Figure 1 As shown, 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.

[0040] 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.

[0041] Furthermore, in this embodiment, the pump body assembly further includes a first sliding vane, a second sliding vane, and a third sliding vane 71. The first cylinder 10, the second cylinder 20, and the third cylinder 30 are respectively provided with a first sliding vane groove, a second sliding vane groove, and a third sliding vane groove, and the first sliding vane, the second sliding vane, and the third sliding vane 71 are respectively slidably disposed in the first sliding vane groove, the second sliding vane groove, and the third sliding vane groove.

[0042] In this embodiment, whether the third cylinder 30 participates in the compression process is determined by the refrigerant input into the third cylinder 30 by the second enthalpy-increasing element 140. For example... Figure 3 As shown, when the second enthalpy-increasing element 140 introduces the first refrigerant into the third cylinder 30, the third vane 71 abuts against the third roller 70, causing the third cylinder 30 to participate in the compression process. Correspondingly, as... Figure 4 As shown, when the second enthalpy-increasing element 140 introduces the second refrigerant into the third cylinder 30, the third vane 71 disengages from the third roller 70, so that the third cylinder 30 does not participate in the compression process. The pressure of the first refrigerant is less than the pressure of the second refrigerant.

[0043] In this embodiment, the first refrigerant is a medium-pressure refrigerant, and the second refrigerant is a high-pressure refrigerant.

[0044] In this embodiment, the first cylinder 10 draws in low-pressure refrigerant and compresses it to obtain medium-pressure refrigerant. This medium-pressure refrigerant mixes with the supplementary gas from the first enthalpy-enhancing element 130 in the intermediate chamber and is then drawn in by the second cylinder 20 for further compression to obtain high-pressure refrigerant. The third cylinder 30 directly draws in medium-pressure refrigerant from the second enthalpy-enhancing element 140 and compresses it to obtain high-pressure refrigerant. When the second enthalpy-enhancing element 140 inputs medium-pressure refrigerant into the third cylinder 30, a pressure difference exists between the head and tail of the third sliding vane 71 inside the third cylinder 30, causing the third sliding vane 71 to maintain contact with the third roller 70. The third cylinder 30 participates in the compression process, such as... Figure 3 As shown. When the second enthalpy-increasing element 140 inputs high-pressure refrigerant into the third cylinder 30, there is no pressure difference between the head and tail of the third sliding vane 71 inside the third cylinder 30, causing the third sliding vane 71 to disengage from the third roller 70. The third cylinder 30 is in an idling state and does not participate in the compression process, as shown. Figure 4 As shown.

[0045] In an optional embodiment, the third cylinder 30 is equipped with a vane differential pressure control component to control the pressure difference between the head and tail of the third vane 71, so that the third vane 71 contacts or disengages from the third roller 70. Specifically, the vane differential pressure control component controls the pressure difference between the head and tail of the third vane 71 through a solenoid valve, thereby realizing active control over whether the third cylinder 30 participates in the compression process. When the ambient temperature is detected to be lower than a preset threshold, the solenoid valve used for vane differential pressure control is automatically closed, causing the third vane 71 to disengage from the third roller 70, and the third cylinder 30 enters an idling state; when the ambient temperature rises back to the normal range, the solenoid valve is reopened, restoring the compression function of the third cylinder 30. Using the above configuration enhances the intelligent control capability of the pump assembly and improves the system response speed and operating accuracy.

[0046] In this embodiment, the first flange 80 and / or the first partition 110 have an intermediate cavity, and the first exhaust port of the first cylinder 10 and the second intake port 21 of the second cylinder 20 are respectively connected to the intermediate cavity. The first cylinder 10 has a first air supply port 12, which is connected to the intermediate cavity and the first enthalpy-increasing element 130 of the fluid machinery.

[0047] In this embodiment, as Figure 1 As shown, the first flange 80 has a first intermediate cavity 81. Specifically, the pump body assembly also includes a second cover plate 150, and the first intermediate cavity 81 is formed between the second cover plate 150 and the first flange 80.

[0048] Furthermore, such as Figure 1 As shown, there are two first partitions 110, and a second intermediate cavity 111 is formed between the two first partitions 110. The second intermediate cavity 111 is connected to the first intermediate cavity 81.

[0049] Specifically, in this embodiment, the second intermediate cavity 111 is opened on the first partition 110 near the first cylinder 10, while the second intake port 21 of the second cylinder 20 is opened on the first partition 110 near the second cylinder 20.

[0050] In this embodiment, as Figure 1As shown, the pump body assembly also includes a second partition 120, and a third cylinder 30 is located between the first cover plate 100 and the second partition 120. The second partition 120 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 partition 120, 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, and the first cover plate 100 and the second partition plate 120 seal the third cylinder 30, thus realizing the independence of the large and small cylinders. At the same time, 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 realizing the independent parallel compression of the large and small cylinders.

[0051] It should be noted that the arrows in the accompanying diagrams indicate the direction of refrigerant flow.

[0052] like Figures 5 to 7 As shown, this application also provides a fluid machine, including a first enthalpy-enhancing element 130, a second enthalpy-enhancing element 140, and the pump body assembly described above. The first enthalpy-enhancing element 130 and the second enthalpy-enhancing element 140 are respectively connected to the first air supply port 12 of the first cylinder 10 and the second air supply port 31 of the third cylinder 30.

[0053] In this embodiment, the fluid machinery is a compressor.

[0054] Furthermore, such as Figures 5 to 7 As shown, the fluid machinery also includes a distributor 160, an inlet pipe 170, a housing 180, an exhaust pipe 190, and a motor assembly. The motor assembly drives the crankshaft 40. Both the pump assembly and the motor assembly are housed within the housing 180. The exhaust pipe 190 is located at the top of the housing 180. The distributor 160 is connected to the first intake port 11 of the first cylinder 10 via the inlet pipe 170.

[0055] In this embodiment, after the fluid machinery is started, the first-stage cylinder, i.e., the first cylinder 10, draws in low-pressure refrigerant from the distributor 160, performs first-stage compression, and outputs medium-pressure refrigerant, which is then sent to the first intermediate chamber 81 and the second intermediate chamber 111. Simultaneously, the first enthalpy-increasing element 130 replenishes the intermediate chamber with medium-pressure refrigerant, mixing it with the medium-pressure refrigerant output from the first cylinder 10, thereby increasing the pressure and mass flow rate of the refrigerant in the intermediate chamber. The second-stage cylinder, i.e., the second cylinder 20, draws in the mixed medium-pressure refrigerant from the adjacent second intermediate chamber 111, performs second-stage compression, and outputs high-pressure refrigerant, which is then sent to the condenser 2000 to complete the cycle.

[0056] Meanwhile, the second enthalpy-increasing element 140 can selectively input medium-pressure refrigerant or high-pressure refrigerant into the second-stage parallel cylinder, i.e., the third cylinder 30. When the second enthalpy-increasing element 140 inputs medium-pressure refrigerant into the third cylinder 30, the third cylinder 30 participates in the second-stage compression process, compressing the medium-pressure refrigerant into high-pressure refrigerant for output. At this time, the third cylinder 30 is equivalent to a part of the second-stage cylinder, and the overall volume ratio of the system increases, making it suitable for efficient operation under normal working conditions.

[0057] When the ambient temperature decreases and the system enters a low-temperature operating condition, the second enthalpy-increasing element 140 switches to input high-pressure refrigerant into the third cylinder 30. At this time, there is no pressure difference between the head and tail of the third vane 71 inside the third cylinder 30, the third vane 71 disengages from the third roller 70, and the third cylinder 30 is in an idling state and does not participate in the compression process. This reduces the system's volumetric ratio, decreases compression power consumption, and improves the system's operational stability and energy efficiency in low-temperature environments.

[0058] The fluid machinery of this application, by setting a first enthalpy-enhancing element 130 connected to the intermediate cavity, mixes the medium-pressure refrigerant compressed in the first-stage cylinder with the medium-pressure refrigerant input through the first enthalpy-enhancing element 130, thereby increasing the suction pressure of the second-stage cylinder and enhancing its heating capacity under low-temperature conditions. When the parallel cylinder operates as the second-stage cylinder during the input of medium-pressure refrigerant, the volume ratio is increased, making it suitable for normal operating conditions. Conversely, when the high-pressure refrigerant is input, the parallel cylinder idles, reducing the volume ratio, making it suitable for low-temperature conditions. This enables the fluid machinery to automatically adjust the volume ratio according to operating conditions, achieving efficient operation and energy savings, and improving system adaptability and reliability.

[0059] This application also provides a heat exchange device, including the aforementioned fluid machinery 1000. In this embodiment, the heat exchange device is an air conditioner, specifically an energy-saving air conditioner.

[0060] like Figure 8As shown, the heat exchange equipment also includes a condenser 2000, a flash evaporator 3000, and an evaporator 4000. The condenser 2000 is connected to the exhaust pipe 190 of the fluid machinery 1000 via a first pipe 101. The flash evaporator 3000 is connected to the first enthalpy-enhancing element 130 via a second pipe 102. The evaporator 4000 is connected to the distributor 160. The second enthalpy-enhancing element 140 is connected in parallel to the first pipe 101 via a third pipe 103.

[0061] Furthermore, such as Figure 9 As shown, an on / off valve 105 is provided on the third pipeline 103. The second pipeline 102 is connected to the third pipeline 103 through the fourth pipeline 104. A one-way valve 106 is provided on the fourth pipeline 104. The opening direction of the one-way valve 106 is from the second pipeline 102 toward the third pipeline 103. The connection between the fourth pipeline 104 and the third pipeline 103 is closer to the second enthalpy-increasing element 140 relative to the on / off valve 105.

[0062] Understandably, the first pipe 101 is a high-pressure refrigerant pipe, and the second pipe 102 is a medium-pressure refrigerant pipe. In the heat exchange equipment, both the medium-pressure and high-pressure refrigerant pipes are connected to the second enthalpy-enhancing element 140. When the on / off valve 105 is closed, the medium-pressure refrigerant can enter the second enthalpy-enhancing element 140 through the second pipe 102; when the on / off valve 105 is open, the high-pressure refrigerant can enter the second enthalpy-enhancing element 140 through the first pipe 101. This allows the second enthalpy-enhancing element 140 to selectively input either medium-pressure or high-pressure refrigerant into the third cylinder 30. At this time, the one-way valve 106 can prevent backflow.

[0063] In this embodiment, the on / off valve 105 can be a solenoid valve.

[0064] Furthermore, Figure 10 A graph showing the volume ratio of the pump body assembly versus its relative coefficient of performance is presented. This graph illustrates the impact of the volume ratio on performance under normal and low-temperature operating conditions. As can be seen from the graph, each curve has a peak, representing the optimal volume ratio design value for that operating condition. The optimal volume ratio design value under normal operating conditions is greater than that under low-temperature operating conditions. This application achieves changes in the volume ratio by controlling whether the third cylinder 30 participates in the compression process, thereby adapting to different operating conditions, achieving high-efficiency operation and energy saving, and improving system adaptability and reliability.

[0065] As can be seen from the above description, the above embodiments of the present invention achieve the following technical effects: the first cylinder 10 and the second cylinder 20 form a two-stage compression structure, and the third cylinder 30 serves as a second-stage parallel cylinder. By controlling whether the third cylinder 30 participates in or does not participate in the compression process of the pump body assembly, under normal operating conditions, the third cylinder 30 participates in the compression process, thereby increasing the displacement of the second-stage cylinder and increasing the volume ratio of the pump body assembly. Under low-temperature operating conditions, the third cylinder 30 does not participate in the compression process, thereby reducing the displacement of the second-stage cylinder and decreasing the volume ratio of the pump body assembly. This enables the pump body assembly to automatically adjust the volume ratio according to different operating conditions, achieving dynamic adjustment of the volume ratio, thereby achieving efficient operation and energy saving, and improving the operational stability and reliability of the heat exchange equipment.

[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] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. 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 figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0068] In the description of this invention, 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 generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention 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 invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0069] 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.

[0070] 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 should not be construed as limiting the scope of protection of this invention.

[0071] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pump body assembly, characterized in that, include: A first cylinder (10) and a second cylinder (20) are provided with a first partition (110) between the first cylinder (10) and the second cylinder (20), and the first exhaust port of the first cylinder (10) is connected to the second intake port (21) of the second cylinder (20); The volume of the third cylinder (30) is 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) is located on the side of the second flange (90) away from the first flange (80), and the third cylinder (30) is located between the second flange (90) and the first cover plate (100); The third cylinder (30) is provided with a second air inlet (31) for communicating with the second enthalpy-enhancing element (140) of the fluid machinery. In response to the second enthalpy-enhancing element (140) inputting refrigerant of different pressures into the third cylinder (30) through the second air inlet (31), the third cylinder (30) may or may not participate in the compression process.

2. The pump body assembly according to claim 1, characterized in that, The pump body assembly further includes a third roller (70) and a third vane (71). The third roller (70) is disposed within the third cylinder (30), and the third cylinder (30) has a third vane groove. The third vane (71) is slidably disposed within the third vane groove. When the second enthalpy-increasing element (140) inputs the first refrigerant into the third cylinder (30), the third sliding vane (71) abuts against the third roller (70) so that the third cylinder (30) participates in the compression process. When the second enthalpy-increasing element (140) inputs the second refrigerant into the third cylinder (30), the third sliding vane (71) disengages from the third roller (70) so that the third cylinder (30) does not participate in the compression process. The pressure of the first refrigerant is less than the pressure of the second refrigerant.

3. The pump body assembly according to claim 1, characterized in that, The first flange (80) and / or the first partition (110) have an intermediate cavity. The first exhaust port of the first cylinder (10) and the second intake port (21) of the second cylinder (20) are respectively connected to the intermediate cavity. The first cylinder (10) has a first air supply port (12). The first air supply port (12) is respectively connected to the intermediate cavity and the first enthalpy-increasing element (130) of the fluid machinery.

4. The pump body assembly according to claim 3, characterized in that, The first flange (80) has the intermediate cavity, and the pump body assembly also includes a second cover plate (150), which forms the intermediate cavity between the second cover plate (150) and the first flange (80).

5. The pump body assembly according to claim 3, characterized in that, There are two first partitions (110), and the intermediate cavity is formed between the two first partitions (110).

6. 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 peripheries of the first expansion section (42) and the second expansion section (43) extend beyond the outer periphery of the main body (41), and 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).

7. The pump body assembly according to claim 6, 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.

8. The pump body assembly according to claim 6, characterized in that, The pump body assembly also includes a second partition (120), the third cylinder (30) is located between the first cover plate (100) and the second partition (120), 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 partition (120), and the lower end face of the third cylinder (30) is sealed to the first cover plate (100).

9. The pump body assembly according to claim 1, characterized in that, The pump body assembly also includes a third roller (70) and a third vane (71). The third roller (70) is disposed in the third cylinder (30). The third cylinder (30) is provided with a vane pressure differential control assembly for controlling the pressure difference between the head and tail of the third vane (71) so that the third vane (71) contacts or disengages from the third roller (70).

10. A fluid machine, characterized in that, The assembly includes a first enthalpy-enhancing element (130), a second enthalpy-enhancing element (140), and a pump body assembly as described in any one of claims 1 to 9, wherein the first enthalpy-enhancing element (130) and the second enthalpy-enhancing element (140) are respectively connected to the first air supply port (12) of the first cylinder (10) and the second air supply port (31) of the third cylinder (30).

11. A heat exchange device, characterized in that, Including the fluid machinery as described in claim 10.

12. The heat exchange device according to claim 11, characterized in that, The heat exchange equipment further includes a condenser (2000) and a flash evaporator (3000). The condenser (2000) is connected to the pump assembly via a first pipeline (101). The flash evaporator (3000) is connected to the first enthalpy-enhancing element (130) via a second pipeline (102). The second enthalpy-enhancing element (140) is connected in parallel to the first pipeline (101) via a third pipeline (103). An on / off valve (105) is provided on the third pipeline (103). The second pipeline (102) is connected to the third pipeline (103) through the fourth pipeline (104), and a one-way valve (106) is provided on the fourth pipeline (104). The opening direction of the one-way valve (106) is from the second pipeline (102) toward the third pipeline (103), and the connection between the fourth pipeline (104) and the third pipeline (103) is closer to the second enthalpy-increasing element (140) relative to the on / off valve (105).

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