Pump body assembly and compressor

Abstract

This invention provides a pump body assembly and a compressor. The pump body assembly includes a cylinder liner, a piston, and a muffler structure. The cylinder liner has an inlet and an outlet. The piston is slidably disposed within the cylinder liner to form a variable volume chamber, and the variable volume chamber is located in the sliding direction of the piston. The muffler structure is connected to the cylinder liner and has a muffler cavity. The cavity wall of the muffler cavity has a communication hole for communicating with the outlet, and the cavity wall also has a pressure relief port. When the piston is in the inlet position, the inlet communicates with the variable volume chamber; when the piston is in the outlet position, the outlet communicates with the variable volume chamber; and when the outlet pressure reaches a preset outlet pressure, the pressure relief port is opened. This invention solves the problems in the prior art where oil-containing refrigerant in the compressor severely affects the thermal efficiency of the refrigeration equipment, and where fluctuations in outlet pressure lead to an excessively high suction-to-discharge pressure ratio.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, and more specifically, to a pump assembly and a compressor. Background Technology

[0002] Refrigerator compressors are evolving towards higher speeds, and the suction-discharge pressure ratio is continuously increasing. The gas discharged by the compressor is high-temperature, high-pressure gas with a relatively high airflow velocity. This inevitably generates significant vibration and noise during exhaust, directly impacting the compressor's overall performance. Therefore, refrigerator compressors typically incorporate one or more silencers.

[0003] However, the gas discharged from the compressor is superheated vapor, that is, a mixture of refrigerant vapor and some lubricating oil. This mixture is transported to the condenser through pipelines. The oil-containing refrigerant affects the condensation and evaporation heat transfer in the condenser, thus reducing the compressor's thermal efficiency. In addition, the compressor's discharge pressure is usually affected by the environment and the quality of the refrigerant, resulting in discharge pressure fluctuations and an excessively high suction-discharge pressure ratio, which directly affects the reliable operation of the compressor. Summary of the Invention

[0004] The main objective of this invention is to provide a pump assembly and a compressor to solve the problems in the prior art where oil-containing refrigerant in the compressor seriously affects the thermal efficiency of the refrigeration equipment, and where fluctuations in discharge pressure lead to an excessively high suction-discharge pressure ratio.

[0005] To achieve the above objectives, according to one aspect of the present invention, a pump body assembly is provided, including a cylinder liner, a piston, and a muffler structure. The cylinder liner has an intake port and an exhaust port. The piston is slidably disposed within the cylinder liner to form a variable volume chamber, and the variable volume chamber is located in the sliding direction of the piston. The muffler structure is connected to the cylinder liner and has a muffler cavity. The cavity wall of the muffler cavity has a communication hole for communicating with the exhaust port, and the cavity wall of the muffler cavity also has a pressure relief port. When the piston is in the intake position, the intake port communicates with the variable volume chamber. When the piston is in the exhaust position, the exhaust port communicates with the variable volume chamber. When the piston is in the exhaust position, the exhaust port communicates with the variable volume chamber. When the exhaust pressure reaches a preset exhaust pressure, the pressure relief port is opened.

[0006] Furthermore, the pump body assembly also includes a valve plate structure, which is movably disposed within the silencing cavity. The valve plate structure has an open position that slides along a first direction A to open the pressure relief port, and a closed position that slides along a second direction B to close the pressure relief port, wherein the first direction A and the second direction B are opposite.

[0007] Furthermore, the first direction A is parallel to the axis of the silencing cavity; or, the second direction B is parallel to the axis of the silencing cavity.

[0008] Furthermore, the pump body assembly also includes an elastic element disposed on the surface of the valve plate structure facing the bottom surface of the silencing cavity, and the elastic element has an elastic force that provides the valve plate structure away from the bottom surface of the silencing cavity to close the pressure relief port.

[0009] Furthermore, there are multiple elastic elements, which are spaced apart on the surface of the valve plate structure facing the bottom surface of the silencing cavity.

[0010] Furthermore, the pump body assembly also includes a limiting structure, which is disposed within the silencing cavity and divides the silencing cavity into a first sub-silencing cavity and a second sub-silencing cavity in the axial direction. The limiting structure has an exhaust groove for connecting the first sub-silencing cavity and the second sub-silencing cavity. The pressure relief port is located on the cavity wall of the second sub-silencing cavity. The valve plate structure is movably disposed within the second sub-silencing cavity. The limiting structure is located on the sliding path of the valve plate structure to provide a force opposite to the elastic force to the valve plate structure.

[0011] Furthermore, the limiting structure has at least one first guide protrusion on the surface facing the valve plate structure, and the valve plate structure has a first guide hole at the position opposite to the first guide protrusion; and / or, the limiting structure has at least one second guide hole on the surface facing the valve plate structure, and the valve plate structure has a second guide protrusion at the position opposite to the guide hole.

[0012] Furthermore, the limiting structure and the noise reduction structure are detachably connected.

[0013] Furthermore, there are multiple exhaust slots, which are evenly distributed on the limiting structure.

[0014] Furthermore, the limiting structure has multiple sets of exhaust grooves, and each set of exhaust grooves includes two exhaust grooves that are symmetrically arranged about the geometric center of the limiting structure.

[0015] Furthermore, in the radial direction of the limiting structure and from the inside out, the distance between each exhaust groove and the geometric center of the limiting structure is gradually increased.

[0016] Furthermore, the two adjacent sets of exhaust channels are located in different regions in the circumferential direction of the limiting structure.

[0017] Furthermore, there are multiple silencing structures, which are connected in sequence. The silencing cavity of the silencing structure at the beginning is connected to the exhaust port, and at least the silencing cavity of the silencing structure at the end has a pressure relief port on its cavity wall.

[0018] According to another aspect of the present invention, a compressor is provided, including a pump body assembly, wherein the pump body assembly is the pump body assembly described above.

[0019] By applying the technical solution of this invention, a pressure relief port is provided on the cavity wall of the silencing cavity. When the piston is in the intake position, the intake port is connected to the variable volume cavity. When the piston is in the exhaust position, the exhaust port is connected to the variable volume cavity. When the exhaust pressure reaches the preset exhaust pressure, the pressure relief port is opened. In this way, the setting of the pressure relief port ensures that the compressor can return oil in time and adjust the exhaust pressure, thereby effectively improving the exhaust pressure fluctuation of the compressor and thus helping to improve the performance of the compressor.

[0020] Among these features, timely oil return from the compressor can prevent the lubricating oil from being transported to the condenser through pipelines, thus affecting thermal efficiency. In addition, the pressure relief port can also reduce pressure, thereby regulating the discharge pressure. The pressure relief port can also stabilize the pressure, preventing excessive discharge noise from the compressor due to fluctuations in discharge pressure. Attached Figure Description

[0021] 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:

[0022] Figure 1 A schematic diagram of the pump body assembly of a compressor according to an optional embodiment of the present invention is shown;

[0023] Figure 2 It shows Figure 1 Another structural diagram of the pump body assembly;

[0024] Figure 3 It shows Figure 1 A schematic diagram of the limiting structure of the pump body assembly;

[0025] Figure 4 It shows Figure 1 A schematic diagram of the valve plate structure of the pump body assembly.

[0026] The above figures include the following reference numerals:

[0027] 10. Cylinder liner;

[0028] 20. Silencing structure; 21. Silencing cavity; 211. First sub-silencing cavity; 212. Second sub-silencing cavity; 2121. Assembly hole; 22. Pressure relief port; 23. Connecting hole;

[0029] 30. Valve plate structure; 31. First guide hole;

[0030] 40. Elastic components;

[0031] 50. Limiting structure; 51. Exhaust groove; 52. First guide protrusion; 521. Positioning hole. Detailed Implementation

[0032] 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.

[0033] In order to solve the problems of oil-containing refrigerant in existing compressors severely affecting the thermal efficiency of refrigeration equipment and the excessive suction-discharge pressure ratio caused by discharge pressure fluctuations, the present invention provides a pump body assembly and a compressor, wherein the compressor includes a pump body assembly, which is the pump body assembly described above and below.

[0034] like Figures 1 to 4 As shown, the pump assembly includes a cylinder liner 10, a piston, and a muffler structure 20. The cylinder liner 10 has an air inlet and an exhaust port. The piston is slidably disposed within the cylinder liner 10 to form a variable volume chamber, and the variable volume chamber is located in the sliding direction of the piston. The muffler structure 20 is connected to the cylinder liner 10 and has a muffler cavity 21. The cavity wall of the muffler cavity 21 has a communication hole for communicating with the exhaust port, and the cavity wall of the muffler cavity 21 also has a pressure relief port 22. When the piston is in the air inlet position, the air inlet communicates with the variable volume chamber. When the piston is in the exhaust position, the exhaust port communicates with the variable volume chamber. When the exhaust pressure reaches the preset exhaust pressure, the pressure relief port 22 is opened.

[0035] By providing a pressure relief port 22 on the wall of the silencing chamber 21, the intake port is connected to the variable volume chamber when the piston is in the intake position, and the exhaust port is connected to the variable volume chamber when the piston is in the exhaust position. When the exhaust pressure reaches the preset exhaust pressure, the pressure relief port 22 is opened. In this way, the setting of the pressure relief port 22 ensures that the compressor can return oil in time and regulate the exhaust pressure, thereby effectively improving the exhaust pressure fluctuation of the compressor and thus helping to improve the performance of the compressor.

[0036] Among them, timely oil return of the compressor can prevent the thermal efficiency from being affected by the lubricating oil being transported to the condenser through the pipeline. In addition, the pressure relief port 22 can also reduce the pressure and achieve the purpose of regulating the exhaust pressure. The pressure relief port 22 can also stabilize the pressure and prevent the compressor exhaust noise from being too loud due to exhaust pressure fluctuations.

[0037] like Figure 1As shown, the pump body assembly also includes a valve plate structure 30, which is movably disposed within the silencing cavity 21. The valve plate structure 30 has an open position that slides along a first direction A to open the pressure relief port 22, and a closed position that slides along a second direction B to close the pressure relief port 22, wherein the first direction A and the second direction B are opposite. This ensures the ease with which the valve plate structure 30 can open and close the pressure relief port 22.

[0038] It should be noted that in this application, the first direction A is parallel to the axial direction of the silencing cavity 21; or, the second direction B is parallel to the axial direction of the silencing cavity 21. This ensures that the valve plate structure 30 slides along the axial direction of the silencing cavity 21, ensuring the reliability of both closing and opening the pressure relief port 22.

[0039] like Figure 4 As shown, the pump body assembly also includes an elastic element 40, which is disposed on the surface of the valve plate structure 30 facing the bottom surface of the silencing cavity 21. The elastic element 40 provides an elastic force to the valve plate structure 30 away from the bottom surface of the silencing cavity 21 to close the pressure relief port 22. Thus, after the compressor completes the exhaust operation, the elastic element 40 provides an elastic force to the valve plate structure 30 away from the bottom surface of the silencing cavity 21, thereby closing the pressure relief port 22 and ensuring the reliability of the closure of the pressure relief port 22.

[0040] Optionally, there are multiple elastic elements 40, which are spaced apart on the surface of the valve plate structure 30 facing the bottom surface of the silencing cavity 21. This ensures that the multiple elastic elements 40 can provide a uniform force to the valve plate structure 30, thereby ensuring that the valve plate structure 30 can slide smoothly.

[0041] like Figure 4 As shown, the elastic element 40 is a spring, and there are four springs. The four springs are spaced apart around the outer periphery of the first guide hole 31 of the valve plate structure 30.

[0042] It should be noted that in this application, the spring should have high stiffness and will only deform under high pressure conditions.

[0043] like Figure 1 and Figure 3As shown, the pump assembly also includes a limiting structure 50, which is disposed within the silencing cavity 21 and divides the silencing cavity 21 into a first sub-silencing cavity 211 and a second sub-silencing cavity 212 along its axial direction. The limiting structure 50 has an exhaust groove 51 for connecting the first sub-silencing cavity 211 and the second sub-silencing cavity 212. A pressure relief port 22 is located on the cavity wall of the second sub-silencing cavity 212. The valve plate structure 30 is movably disposed within the second sub-silencing cavity 212. The limiting structure 50 is located on the sliding path of the valve plate structure 30 to provide a force opposite to the elastic force to the valve plate structure 30. Thus, the limiting structure 50 acts as a constraint force on the valve plate structure 30, confining it within the second sub-silencing cavity 212 for sliding.

[0044] Specifically, when the exhaust pressure is too high, the airflow passes through the exhaust groove 51 on the limiting structure 50 and impacts the valve plate structure 30. The valve plate structure 30 squeezes the spring and disengages from the limiting structure 50. The gas and lubricating oil are discharged through the pressure relief port 22 on the silencer 21. After the exhaust is completed, the spring rebounds and pushes against the valve plate structure 30 and the limiting structure 50 again to complete the seal.

[0045] like Figure 3 and Figure 4 As shown, the limiting structure 50 has at least one first guide protrusion 52 on the surface facing the valve plate structure 30, and the valve plate structure 30 has a first guide hole 31 at the position opposite to the first guide protrusion 52. In this way, by extending the first guide protrusion 52 into the first guide hole 31, it plays a guiding role for the valve plate structure 30, ensuring the smooth sliding of the valve plate structure 30.

[0046] like Figure 3 and Figure 4 As shown, there are three first guide protrusions 52. Two of the three first guide protrusions 52 with smaller diameters are located on both sides of the first guide protrusion 52 with larger diameter. Each first guide protrusion 52 has a positioning hole 521, and each positioning hole 521 has a first internal thread structure. The bottom surface of the silencing cavity 21 has an assembly hole 2121 at the position opposite to the first guide protrusion 52. Each assembly hole 2121 has a second internal thread structure. The pump body assembly also includes fasteners. The fasteners pass through the first internal thread structure and the second internal thread structure in sequence to fix the limiting structure 50 and the silencing structure 20 shown.

[0047] It should be noted that, in an embodiment of this application (not shown), the limiting structure 50 has at least one second guide hole on the surface facing the valve plate structure 30, and the valve plate structure 30 has a second guide protrusion at the position opposite to the first guide hole 31. Thus, by extending the second guide protrusion into the second guide hole, it guides the valve plate structure 30, ensuring the smooth sliding of the valve plate structure 30.

[0048] Optionally, the limiting structure 50 and the silencing structure 20 are detachably connected. This ensures that the limiting structure 50 is easy to install and remove.

[0049] like Figure 3 As shown, there are multiple exhaust grooves 51, which are evenly distributed on the limiting structure 50. This ensures that the discharged gas can apply a smooth pushing force to the valve plate structure 30 through the multiple exhaust grooves 51, thereby ensuring that the valve plate structure 30 can slide smoothly.

[0050] Preferably, the limiting structure 50 has multiple sets of exhaust grooves 51, and each set of exhaust grooves 51 includes two exhaust grooves 51 that are symmetrically arranged about the geometric center of the limiting structure 50.

[0051] like Figure 3 As shown, in the radial direction of the limiting structure 50 and from the inside out, the distance between each exhaust groove 51 and the geometric center of the limiting structure 50 is gradually increased.

[0052] like Figure 3 As shown, the exhaust groove 51 is a quarter-circular arc groove.

[0053] like Figure 3 As shown, the two adjacent sets of exhaust grooves 51 are located in different areas in the circumferential direction of the limiting structure 50. This ensures that the forces on the valve plate structure 30 are as balanced as possible.

[0054] like Figure 1 and Figure 2 As shown, there are multiple silencing structures 20, which are connected sequentially. The silencing cavity 21 of the first silencing structure 20 is connected to the exhaust port, and at least the cavity wall of the silencing cavity 21 of the last silencing structure 20 is provided with a pressure relief port 22. In this way, the arrangement of multiple silencing structures 20 ensures the reliability of the silencing effect.

[0055] like Figure 2 As shown, two adjacent noise-absorbing structures 20 are connected by a connecting hole 23.

[0056] It should be noted that when the compressor discharges gas, if the discharge pressure fluctuates too much after entering the silencer chamber 21, the high-speed, high-temperature oil-containing gas impacts the valve plate structure 30 through the discharge groove 51. The valve plate structure 30 compresses the return spring, causing it to separate from the limiting structure 50. The gas is then discharged through the pressure relief port 22, completing the pressure relief and oil return process. The return spring then returns to its original shape and re-compresses the valve plate structure 30 and the limiting structure 50, completing the seal.

[0057] The high-pressure gas discharged through the pressure relief port 22 mixes with the low-pressure gas inside the casing to form medium-pressure gas. This medium-pressure gas is then drawn back into the cylinder bore through the intake silencer, which helps reduce the intake-to-exhaust pressure ratio, lowers the compressor's exhaust temperature, and improves the compressor's reliability. The pressure relief port 22 on the silencer chamber 21 also serves as an oil return port, preventing lubricating oil from being transported to the condenser through pipelines and affecting the system's thermal efficiency. Furthermore, since the cylinder liner 10 in this embodiment can stably control the exhaust pressure, this invention can reduce compressor exhaust noise at its source while improving compressor performance.

[0058] 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.

[0059] 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.

[0060] 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.

[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] 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.

[0063] 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: Cylinder liner (10), the cylinder liner (10) having an air inlet and an exhaust outlet; A piston is slidably disposed within the cylinder liner (10) to form a variable volume cavity, and the variable volume cavity is located in the sliding direction of the piston; The muffler structure (20) is connected to the cylinder liner (10), and the muffler structure (20) has a muffler cavity (21). The cavity wall of the muffler cavity (21) is provided with a communication hole for communicating with the exhaust port, and the cavity wall of the muffler cavity (21) is also provided with a pressure relief port (22). When the piston is in the intake position, the intake port is connected to the variable volume chamber; when the piston is in the exhaust position, the exhaust port is connected to the variable volume chamber; and when the exhaust pressure reaches the preset exhaust pressure, the pressure relief port (22) is opened. The pump assembly also includes: A valve plate structure (30) is movably disposed within the silencing cavity (21); An elastic element (40) is disposed on the surface of the valve plate structure (30) facing the bottom surface of the cavity (21), and the elastic element (40) has an elastic force that provides the valve plate structure (30) away from the bottom surface of the cavity (21) to close the pressure relief port (22). A limiting structure (50) is provided inside the silencing cavity (21) and divides the silencing cavity (21) into a first sub-silencing cavity (211) and a second sub-silencing cavity (212) in the axial direction. An exhaust groove (51) is provided on the limiting structure (50) and the exhaust groove (51) is used to connect the first sub-silencing cavity (211) and the second sub-silencing cavity (212). Wherein, the pressure relief port (22) is located on the cavity wall of the second sub-silencing cavity (212), the valve plate structure (30) is movably disposed in the second sub-silencing cavity (212), and the limiting structure (50) is located on the sliding path of the valve plate structure (30) to provide the valve plate structure (30) with a force opposite to the elastic force; When the exhaust pressure is too high, the airflow passes through the exhaust groove (51) and impacts the valve plate structure (30). The valve plate structure (30) squeezes the elastic element (40) to disengage from the limiting structure (50). Gas and lubricating oil are discharged through the pressure relief port (22). After the exhaust is completed, the elastic element (40) rebounds and presses against the valve plate structure (30) and the limiting structure (50) again to complete the seal.

2. The pump body assembly according to claim 1, characterized in that, The valve plate structure (30) has an open position that slides along a first direction A to open the pressure relief port (22), and a closed position that slides along a second direction B to close the pressure relief port (22), wherein the first direction A is opposite to the second direction B.

3. The pump body assembly according to claim 2, characterized in that, The first direction A is parallel to the axial direction of the silencing cavity (21); or, the second direction B is parallel to the axial direction of the silencing cavity (21).

4. The pump body assembly according to claim 1, characterized in that, There are multiple elastic elements (40), and the multiple elastic elements (40) are spaced apart on the surface of the valve plate structure (30) facing the bottom surface of the cavity (21).

5. The pump body assembly according to claim 1, characterized in that, The limiting structure (50) has at least one first guide protrusion (52) on the surface facing the valve plate structure (30), and the valve plate structure (30) has a first guide hole (31) at a position opposite to the first guide protrusion (52); and / or, The limiting structure (50) has at least one second guide hole on the surface facing the valve plate structure (30), and the valve plate structure (30) has a second guide protrusion at the position opposite to the guide hole (31).

6. The pump body assembly according to claim 1, characterized in that, The limiting structure (50) is detachably connected to the silencing structure (20).

7. The pump body assembly according to claim 1, characterized in that, There are multiple exhaust grooves (51), and the multiple exhaust grooves (51) are evenly distributed on the limiting structure (50).

8. The pump body assembly according to claim 7, characterized in that, The limiting structure (50) has multiple sets of exhaust grooves (51), and the exhaust grooves (51) in the same set include two exhaust grooves (51) that are symmetrically arranged about the geometric center of the limiting structure (50).

9. The pump body assembly according to claim 8, characterized in that, In the radial direction from the inside out of the limiting structure (50), the distance between each of the exhaust grooves (51) and the geometric center of the limiting structure (50) is gradually increased.

10. The pump body assembly according to claim 8, characterized in that, The two adjacent sets of the exhaust channels (51) are located in different areas in the circumferential direction of the limiting structure (50).

11. The pump body assembly according to any one of claims 1 to 10, characterized in that, The silencing structure (20) is multiple, and the multiple silencing structures (20) are connected in sequence. The silencing cavity (21) of the silencing structure (20) at the beginning is connected to the exhaust port, and the pressure relief port (22) is opened on the cavity wall surface of the silencing cavity (21) of the silencing structure (20) at the end.

12. A compressor, characterized in that, It includes a pump body assembly, which is the pump body assembly according to any one of claims 1 to 11.

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