Exhaust valve assembly and compressor

Abstract

The invention discloses an exhaust valve assembly and a compressor, and relates to the technical field of compressors, the exhaust valve assembly comprises a valve seat and an exhaust valve plate, one end face of the valve seat in the thickness direction is a mounting face, an exhaust hole is formed in the mounting face in a penetrating mode, the exhaust hole is used for communicating with a compression cavity of the compressor, and a mounting groove spaced from the exhaust hole is concavely formed in the mounting face; a first oil discharge channel is formed in the valve seat; the exhaust valve plate is provided with a fixed end and a movable end which are oppositely arranged in the length direction of the exhaust valve plate, the fixed end is arranged in the mounting groove, the movable end can cover the exhaust hole and can movably open the exhaust hole, and a fit clearance is defined between the side portion of the exhaust valve plate and the inner side wall of the mounting groove; one end of the first oil discharge channel communicates with the fit clearance, and the other end penetrates through the valve seat. Due to the pressure difference inside and outside the compression cavity, when the movable end of the exhaust valve plate opens the exhaust hole, part of accumulated lubricating oil can be driven to be guided out along the first oil discharge channel based on pressure, and therefore the oil content near the exhaust valve plate is reduced.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and particularly to exhaust valve assemblies and compressors. Background Technology

[0002] As a highly efficient and energy-saving fluid transport device, the reliability and energy efficiency of a compressor are greatly affected by its internal lubrication system. During compressor operation, lubricating oil not only lubricates and cools key friction pairs but also participates in sealing the compression chamber. However, under actual operating conditions, some lubricating oil may enter the cylinder through leakage or suction, be compressed along with the refrigerant, and eventually accumulate in the area around the exhaust valve plate.

[0003] The retention of lubricating oil near the exhaust valve plate significantly alters the valve plate's dynamic behavior. Due to the viscosity of the lubricating oil, its viscous effect creates additional damping on the valve plate's movement, causing the valve plate to delay opening when needed and delay closing when needed, ultimately resulting in reduced compressor efficiency. Summary of the Invention

[0004] The main objective of this invention is to provide an exhaust valve assembly and compressor that can drain the lubricating oil accumulated near the exhaust valve plate, thereby reducing the impact of the lubricating oil on the exhaust valve plate and improving energy efficiency.

[0005] To achieve the above objectives, the present invention provides an exhaust valve assembly for a compressor, the exhaust valve assembly comprising: A valve seat, wherein one end face of the valve seat along its thickness direction is a mounting surface, and an exhaust hole is provided through the mounting surface for connecting to the compression chamber of the compressor. An mounting groove is recessed on the mounting surface at intervals from the exhaust hole, and the valve seat forms a first oil discharge channel. An exhaust valve plate has a fixed end and a movable end arranged opposite to each other along its length. The fixed end is disposed in the mounting groove, and the movable end can cover the exhaust hole and can movably open the exhaust hole. A fitting clearance is defined between the side of the exhaust valve plate and the inner sidewall of the mounting groove. One end of the first oil discharge channel is connected to the mating gap, and the other end is disposed through the valve seat to discharge the lubricating oil in the mating gap.

[0006] In one embodiment, the peripheral side of the valve seat is provided with a first oil drain hole that communicates with the mounting groove; The first oil drain channel includes the first oil drain hole.

[0007] In one embodiment, the sidewall of the mounting groove used to define the mating clearance is recessed with a first oil drain groove, and the first oil drain groove communicates with the first oil drain hole; The first oil discharge channel also includes the first oil discharge trough.

[0008] In one embodiment, the bottom wall of the first oil drain hole and / or the first oil drain groove is inclined and is gradually moved away from the exhaust hole in the direction of the valve seat away from the exhaust valve plate.

[0009] In one embodiment, the first oil drain groove and the first oil drain hole are arranged in a straight line.

[0010] In one embodiment, the valve seat also forms a second oil discharge channel, one end of which is connected to the mating gap, and the other end is used to connect to the inner cavity of the muffler.

[0011] In one embodiment, the valve seat is provided with a second oil drain hole, which is inclined along the groove opening of the mounting groove towards the bottom of the mounting groove. One end of the second oil drain hole passes through the mounting surface and is used to correspond to the inlet of the muffler, while the other end extends to the mounting groove and corresponds to the mating clearance. The second oil drain channel includes the second oil drain hole.

[0012] In one embodiment, the second oil drain hole is disposed through the side wall of the mounting groove to communicate with the mounting groove; and / or, The angle between the second oil drain hole and the mounting surface is α, where α ≤ 30°.

[0013] In one embodiment, the side wall of the mounting groove used to define the mating clearance is recessed with a first oil drain groove, and the peripheral side of the valve seat is provided with a first oil drain hole communicating with the first oil drain groove. The first oil drain channel includes the first oil drain groove and the first oil drain hole. The first oil drain groove and the second oil drain hole are connected at their ends near the fitting gap.

[0014] In one embodiment, the exhaust valve plate has mating sides formed on opposite sides along its width direction, and a mating clearance is defined between each of the two mating sides and the inner wall of the mounting groove, wherein: Two oil drain channels are provided for each of the first and second oil drain channels; or, The first oil drain channel and the second oil drain channel are respectively provided on the two mating sides.

[0015] In one embodiment, a third oil drain channel is formed on the valve seat, one end of which is located near the vent hole to drain the lubricating oil accumulated on the side of the movable end.

[0016] In one embodiment, a recessed groove is provided on the mounting surface, and the bottom wall of the recessed groove is provided with the mounting groove and the vent hole; The valve seat has a third oil drain hole on its side surface, the third oil drain hole is connected to the sink, and the end of the third oil drain hole is spaced apart from the vent hole. The third oil drain channel includes the third oil drain hole.

[0017] In one embodiment, the end of the third oil drain hole extends into the settling tank to form a guide portion.

[0018] The present invention also proposes a compressor, characterized in that it includes the above-described exhaust valve assembly, wherein the exhaust valve assembly includes at least: A valve seat, wherein one end face of the valve seat along its thickness direction is a mounting surface, and an exhaust hole is provided through the mounting surface for connecting to the compression chamber of the compressor. An mounting groove is recessed on the mounting surface at intervals from the exhaust hole, and the valve seat forms a first oil discharge channel. An exhaust valve plate has a fixed end and a movable end arranged opposite to each other along its length. The fixed end is disposed in the mounting groove, and the movable end can cover the exhaust hole and can movably open the exhaust hole. A fitting clearance is defined between the side of the exhaust valve plate and the inner sidewall of the mounting groove. One end of the first oil discharge channel is connected to the mating gap, and the other end is provided through the valve seat to discharge the lubricating oil in the mating gap; The compressor also includes a bearing and a muffler. The bearing is mounted on the crankshaft, and the muffler is located at one end of the bearing along its axial direction. The bearing forms the valve seat, and the end face of the bearing facing the muffler forms the mounting surface.

[0019] In the technical solution of this invention, the fixed end of the exhaust valve plate is connected to the valve seat based on the mounting groove. The valve seat is matched with the corresponding shaft structure in the compressor. Based on the structural matching, a matching gap is defined between the side of the exhaust valve plate and the mounting groove. As the compressor operates for longer, a portion of lubricating oil will accumulate in the matching gap. Due to the pressure difference inside and outside the compression chamber, when the movable end of the exhaust valve plate opens the exhaust port, a portion of the accumulated lubricating oil can be driven by pressure to be discharged along the first oil discharge channel, thereby reducing the oil content near the exhaust valve plate, weakening the influence of lubricating oil on the opening and closing action of the exhaust valve plate, and improving energy efficiency. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the first embodiment of the exhaust valve assembly provided by the present invention; Figure 2 for Figure 1 Top view of the exhaust valve assembly; Figure 3 for Figure 1 Schematic diagram of the middle valve seat; Figure 4 for Figure 3 Top view of the valve seat; Figure 5 for Figure 1 A cross-sectional schematic diagram of the first oil drain channel in the middle; Figure 6 for Figure 1 A schematic diagram of the structure of the second embodiment of the exhaust valve assembly; Figure 7 for Figure 6 Top view of the valve seat; Figure 8 for Figure 1 A schematic diagram of the structure of the third embodiment of the exhaust valve assembly; Figure 9 for Figure 8 A cross-sectional schematic diagram of the first oil drain channel in the middle; Figure 10 for Figure 8 A cross-sectional schematic diagram of the third oil drain channel.

[0022] Explanation of icon numbers: 100. Exhaust valve assembly; 1. Valve seat; 10. Mounting surface; 11. Exhaust hole; 12. Mounting groove; 13. First oil drain hole; 14. First oil drain groove; 15. Second oil drain hole; 16. Settlement groove; 17. Third oil drain hole; 171. Guide part; 18. First mating groove; 19. Second mating groove; 2. Exhaust valve plate; 21. Fixed end; 22. Movable end; 20. Mating clearance; 30. First oil drain channel; 40. Second oil drain channel; 50. Third oil drain channel.

[0023] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0024] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that if the embodiments of the present invention involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0026] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0027] As a highly efficient and energy-saving fluid transport device, the reliability and energy efficiency of a compressor are greatly affected by its internal lubrication system. During compressor operation, lubricating oil not only lubricates and cools key friction pairs but also participates in sealing the compression chamber. However, under actual operating conditions, some lubricating oil may enter the cylinder through leakage or suction, be compressed along with the refrigerant, and eventually accumulate in the area around the exhaust valve plate.

[0028] Lubricating oil retention near the exhaust valve plate can significantly alter the valve plate's dynamic behavior. Specifically: Increased exhaust resistance: Delayed valve plate action will disrupt the smoothness of the exhaust process and increase the resistance to gas discharge; Decreased volumetric efficiency: Insufficient exhaust or backflow may occur, reducing the actual exhaust volume and refrigeration efficiency of the compressor; Reduced energy efficiency: To overcome increased flow resistance and additional power consumption caused by timing misalignment, the overall input power of the machine increases, resulting in a lower energy efficiency ratio.

[0029] Due to the complex internal structure of compressors, their enclosed operating environment, and drastic pressure changes, the actual distribution, accumulation location, and dynamic migration path of lubricating oil are difficult to directly observe or accurately measure. Consequently, existing technologies rarely offer a systematic solution to address lubricating oil accumulation in the valve plate region and improve its dynamic response. Most improvements focus on valve plate optimization or overall oil circuit design.

[0030] This invention proposes an exhaust valve assembly and compressor that can drain the lubricating oil accumulated near the exhaust valve plate, thereby reducing the impact of the lubricating oil on the exhaust valve plate and improving energy efficiency.

[0031] Please refer to Figures 1 to 3 The exhaust valve assembly 100 includes a valve seat 1 and an exhaust valve plate 2. One end face of the valve seat 1 along its thickness direction is a mounting surface 10. An exhaust hole 11 is provided through the mounting surface 10, which is used to connect to the compression chamber of the compressor. An installation groove 12 is recessed on the mounting surface 10 and spaced apart from the exhaust hole 11. The valve seat 1 forms a first oil discharge channel 30 (in conjunction with...). Figure 5 The exhaust valve plate 2 has a fixed end 21 and a movable end 22 arranged opposite to each other along its length. The fixed end 21 is located in the mounting groove 12, and the movable end 22 can cover the exhaust hole 11 and can open the exhaust hole 11. A fitting gap 20 is defined between the side of the exhaust valve plate 2 and the inner sidewall of the mounting groove 12. One end of the first oil discharge channel 30 is connected to the fitting gap 20, and the other end is provided through the valve seat 1 to discharge the lubricating oil in the fitting gap 20.

[0032] In the technical solution of the present invention, the fixed end 21 of the exhaust valve plate 2 is connected to the valve seat 1 based on the mounting groove 12. The valve seat 1 is matched with the corresponding shaft structure in the compressor. Based on the structural matching, a matching gap 20 is defined between the side of the exhaust valve plate 2 and the mounting groove 12. As the compressor operates for longer, a portion of lubricating oil will accumulate in the matching gap 20. Due to the pressure difference inside and outside the compression chamber, when the movable end 22 of the exhaust valve plate 2 opens the exhaust port 11, a portion of the accumulated lubricating oil can be driven by pressure to be discharged along the first oil discharge channel 30, thereby reducing the oil content near the exhaust valve plate 2, weakening the influence of lubricating oil on the opening and closing action of the exhaust valve plate 2, and improving energy efficiency.

[0033] Specifically, the operation of exhaust valve plate 2 is a dynamic process, closely coordinated with the pressure changes in the compression chamber: Closed state (intake and initial compression): When the gas pressure in the compression chamber is lower than the exhaust chamber pressure (or condensation pressure), the exhaust valve plate 2, under its own elasticity or gas pressure, tightly adheres to the exhaust port 11, sealing it off. At this time, the compression chamber is in the intake or compression stage, preventing high-pressure gas backflow.

[0034] Open state (exhaust stage): When the piston or roller continues to move, the gas pressure in the compression chamber rises to a level exceeding the exhaust chamber pressure and sufficient to overcome the elastic preload of the exhaust valve plate 2. The high-temperature, high-pressure gas then forces open the free end of the exhaust valve plate 2, disengaging it from the exhaust port 11. Gas is then discharged from the compression chamber to the exhaust chamber or muffler. The lift (opening height) of the exhaust valve plate 2 is limited by the exhaust limit plate to prevent excessive bending deformation and fatigue fracture.

[0035] Closed state (exhaust end): When most of the gas in the compression chamber is discharged and the pressure drops, the exhaust valve plate 2, under the action of its own elastic force and the exhaust chamber pressure (if any), quickly rebounds and tightly adheres to the exhaust port 11 again, ending the exhaust and preparing for the next working cycle.

[0036] Oil accumulates between the exhaust valve plate 2 and the mounting groove 12, and between the exhaust valve plate 2 and the mounting surface 10, due to gravity. One end of the first oil drain channel 30 is connected to the mounting groove 12 and corresponds to the mating clearance 20, thus making the mating clearance 20 an interface for oil drainage, allowing lubricating oil to be discharged along the first oil drain channel 30. The other end of the first oil drain channel 30 corresponds to the outside of the valve seat 1. In some embodiments, the first oil drain channel 30 may correspond to the muffler outside the exhaust valve assembly 100. However, considering the dynamic balance within the compressor, in this embodiment, the other end of the first oil drain channel 30 extends to the inner cavity of the compressor housing. As the discharged lubricating oil accumulates inside the housing, based on the structure of the bottom of the housing and the operating vibration of the compressor, this lubricating oil may return to the oil sump, without affecting the oil balance in the compressor.

[0037] Please refer to Figure 2 When the exhaust valve plate 2 is installed, the movable end 22 is adapted to the exhaust hole 11, and the whole is circularly arranged. The fixed end 21 is adapted to the mounting groove 12, which facilitates the positioning and connection of the fixed end 21. The fixed end 21 is generally connected by riveting or screw valve seat 1. Therefore, in order to achieve the transition between the movable end 22 and the fixed end 21 of the exhaust valve plate 2, and to ensure the elastic movement of the middle part of the exhaust valve plate 2 and the movable end 22, that is, the width of the middle part of the exhaust valve plate 2 is smaller than the width of its end, a fitting gap 20 is defined between the side of the exhaust valve plate 2 and the inner wall of the mounting groove 12. The size of this fitting gap 20 is determined by the size and shape of the mounting groove 12 and the size and shape of the exhaust valve plate 2.

[0038] Please refer to Figures 3 to 5In some embodiments, the circumferential side of the valve seat 1 is provided with a first oil drain hole 13 that connects to the mounting groove 12, and the first oil drain channel 30 includes the first oil drain hole 13. The first oil drain hole 13 extends through the circumferential side of the valve seat 1, connecting the mounting groove 12 and the inner cavity of the compressor housing. The end of the first oil drain hole 13 can directly correspond to the fitting clearance 20, in which case the lubricating oil accumulated at the fitting clearance 20 can be directly discharged along the first oil drain hole 13. Alternatively, the end of the first oil drain hole 13 can also correspond to the fitting clearance 20. According to the pressure difference between the inside and outside of the compression chamber, the lubricating oil in the fitting clearance 20 will eventually be discharged from the first oil drain hole 13 along a certain trajectory. That is, the first oil drain hole 13 can also directly correspond to the side of the mounting groove 12 away from the exhaust port 11.

[0039] It should be understood that when the fixed end 21 of the exhaust valve plate 2 contacts the side wall of the mounting groove 12, there is no gap between the fixed end 21 of the exhaust valve plate 2 and the mounting groove 12, making it impossible to guide oil. Therefore, it is preferable to extend the first oil drain hole 13 to the mating gap 20. The cross-sectional shape of the first oil drain hole 13 is not limited.

[0040] The position and extension direction of the first oil drain channel 30 are not limited. In some embodiments, the extension directions of the first oil drain hole 13 and the exhaust valve plate 2 intersect. In other embodiments, the extension directions of the first oil drain hole 13 and the exhaust valve plate 2 are the same.

[0041] Based on the position and size of the fitting clearance 20 and the size of the first oil drain hole 13, multiple first oil drain holes 13 are provided corresponding to one fitting clearance 20.

[0042] To enhance the flow of lubricating oil through the first oil drain hole 13, the side wall of the mounting groove 12, which limits the mating clearance 20, is recessed with a first oil drain groove 14, which communicates with the first oil drain hole 13; the first oil drain channel 30 also includes the first oil drain groove 14. The first oil drain groove 14 increases the flow rate on the oil inlet side of the first oil drain hole 13, which is beneficial for achieving the convergence of lubricating oil.

[0043] In some embodiments, the first oil drain groove 14 can be configured in a funnel shape, directly serving as the inlet of the first oil drain hole 13 to provide a guiding function. In other embodiments, the first oil drain groove 14 and the first oil drain hole 13 are arranged in a straight line. In this case, the first oil drain groove 14 and the first oil drain hole 13 extend in the same direction as the exhaust valve plate 2. The first oil drain groove 14 not only facilitates the collection of lubricating oil into the first oil drain hole 13, but also can accommodate more lubricating oil, reducing the accumulation of lubricating oil at the mating clearance 20.

[0044] Furthermore, the bottom walls of the first oil drain hole 13 and / or the first oil drain groove 14 are inclined and gradually moved away from the exhaust hole 11 in the direction of the valve seat 1 away from the exhaust valve plate 2. That is, the first oil drain hole 13 or the second oil drain groove can directly have a guiding effect, accelerating the flow of lubricating oil.

[0045] It should be noted that the location of the first oil outlet 13 needs to take into account the fit between the valve seat 1 and other components, as well as the ease of processing.

[0046] The high-temperature, high-pressure gas discharged from the compressor is usually not directly discharged into the system, but instead enters a silencer first. The main function of the silencer is to reduce exhaust noise and stabilize airflow. When a large amount of lubricating oil accumulates at the mating clearance 20, the first oil drain channel 30 alone cannot guarantee the timely discharge of the lubricating oil. Therefore, please refer to... Figures 6 to 7 The valve seat 1 also forms a second oil discharge passage 40. One end of the second oil discharge passage 40 is connected to the fitting clearance 20, and the other end is used to connect to the inner cavity of the muffler. The second oil discharge passage 40, in conjunction with the first oil discharge passage 30, can increase the oil discharge area. When a large amount of lubricating oil accumulates, some of the lubricating oil can enter the muffler along the second oil discharge passage 40. Since the amount of oil discharged is small, it will not affect the muffler, nor will it affect the dynamic balance of the compressor.

[0047] Specifically, the valve seat 1 is provided with a second oil drain hole 15. The second oil drain hole 15 is inclined along the groove opening of the mounting groove 12 towards the bottom of the mounting groove 12. One end of the second oil drain hole 15 passes through the mounting surface 10 and is used to correspond to the inlet of the muffler. The other end extends to the mounting groove 12 and corresponds to the mating clearance 20. The second oil drain channel 40 includes the second oil drain hole 15. Since the muffler and the valve seat 1 are arranged axially, the first oil drain hole 13 extends axially as a whole. Considering the influence of the oil inlet position of the muffler and the mating position of the valve seat 1 and the shaft on the hole machining, the inclined hole machining is adopted in this embodiment. Since the discharge of lubricating oil only relies on the pressure difference, and this pressure can overcome the influence of gravity, the inclined setting of the second oil drain hole 15 will not affect the lubricating oil discharge action. At the moment the exhaust valve plate 2 is opened, a part of the lubricating oil can enter the muffler along the inclined direction of the second oil drain hole 15.

[0048] Furthermore, the second oil outlet hole 15 is provided through the side wall of the mounting groove 12 to communicate with the mounting groove 12. At this time, the part of the second oil outlet hole 15 inside the mounting groove 12 forms a second oil groove. This structure facilitates the collection of lubricating oil into the second oil outlet hole 15. The second oil groove can also accommodate more lubricating oil and reduce the accumulation of lubricating oil at the mating clearance 20.

[0049] The angle between the second oil drain hole 15 and the mounting surface 10 is α, where α ≤ 30°. The inclination of the second oil drain hole 15 should not be too large, as this can easily cause lubricating oil backflow. The inclination of the second oil drain hole 15 should not be too small, as this will affect the structural strength and make processing difficult.

[0050] When the first oil discharge channel 30 is composed of the first oil discharge hole 13 and the first oil discharge groove 14, the first oil discharge groove 14 and the second oil discharge hole 15 are connected at the ends near the fitting gap 20.

[0051] In some embodiments, the upper wall of the second oil drain hole 15 can be configured to pass through the valve seat 1, that is, the second oil drain hole 15 is a groove-shaped mechanism. However, the size needs to be set reasonably to avoid the refrigerant leakage affecting the performance of the entire compressor.

[0052] The fitting clearance 20 is defined according to the shape of the exhaust valve plate 2. In some embodiments, the exhaust valve plate 2 forms fitting sides on opposite sides along its width direction, and fitting clearance 20 is defined between the two fitting sides and the inner sidewall of the mounting groove 12. In this case, in one embodiment, two corresponding first oil discharge channels 30 and second oil discharge channels 40 can be provided, that is, each fitting clearance 20 can correspond to the first and second fitting channels with intersecting extension directions. In another embodiment, the first oil discharge channel 30 and the second oil discharge channel 40 are respectively provided corresponding to two fitting sides. In this case, the lubricating oil in the fitting clearance 20 on one side is discharged to the outside of the housing through the first oil discharge channel 30, and the lubricating oil in the fitting clearance 20 on the other side is discharged to the muffler through the second oil discharge channel 40.

[0053] Lubricating oil accumulates around the exhaust valve plate 2, not only in the mounting groove 12 but also around the movable end 22 of the exhaust valve plate 2. Therefore, in some embodiments, a third oil discharge channel 50 is formed on the valve seat 1, with one end of the third oil discharge channel 50 located near the exhaust port 11 to discharge the lubricating oil accumulated on the side of the movable end 22. In this embodiment, when the exhaust valve plate 2 is open, the lubricating oil accumulated near the movable end 22 of the exhaust valve plate 2 is discharged into the compressor housing through the third oil discharge channel 50 by means of the pressure difference, thereby enabling bidirectional oil discharge in conjunction with the first exhaust channel.

[0054] The extension direction of the third exhaust valve plate 2 can be the same as or intersect with the extension direction of the first exhaust passage.

[0055] Please refer to Figures 8 to 10 The mounting surface 10 is provided with a recess 16, and the bottom wall of the recess 16 is provided with a mounting groove 12 and an exhaust hole 11. A third oil drain hole 17 is provided on the side surface of the valve seat 1. The third oil drain hole 17 is connected to the sink 16, and the end of the third oil drain hole 17 is spaced apart from the exhaust hole 11. The third oil drain channel 50 includes a third oil drain hole 17. That is, the first exhaust channel and the third oil drain hole 17 can be located on different planes, and there can be a height difference between them along the thickness direction of the valve seat 1. The groove 16 is mainly designed to restrict the installation of the exhaust valve plate 2 and to prevent interference between the exhaust valve assembly 100 and the muffler. However, the design of the groove 16 affects the thickness of the valve seat 1. Therefore, the position and size of the third oil drain hole 17 need to be considered not only based on the location of lubricating oil accumulation but also the depth of the groove 16.

[0056] In this embodiment, the third vent 11 is located 0.3 mm below the bottom wall of the mounting groove 12.

[0057] Furthermore, the end of the third oil hole 17 extends into the recess 16 to form a guide portion 171. The guide portion 171 is disposed through the recess 16 along the side wall in the thickness direction of the valve seat 1, thereby providing a larger space for easy collection of lubricating oil. It should be noted that the size of the guide portion 171 may differ from the size of the third oil hole 17, for example, it may be configured as a gradually expanding trumpet shape.

[0058] In addition, when the valve seat 1 is installed, the mounting surface 10 is provided with a first mating groove 18. The bottom wall of the first mating groove 18 is higher than the bottom wall of the sink 16. The first mating groove 18 is provided through the side facing the exhaust hole 11 so as to communicate with the sink 16. When the movable end 22 of the exhaust valve plate 2 opens the exhaust hole 11, the refrigerant is discharged to the side. At this time, the first mating groove 18 can help the refrigerant diffuse quickly and increase the exhaust area.

[0059] When the third row of oil holes 17 is set, the minimum plate thickness at the setting position becomes smaller due to the setting of the first mating groove 18. In order to ensure the flow rate of the third row of oil holes 17, the third row of oil holes 17 is set as a flat hole, and its cross-section can be square, elliptical or other regular or irregular shapes.

[0060] Taking the upper surface of valve seat 1 as the mounting surface 10 as an example, the upper wall of the third oil drain hole 17 is set higher than the bottom wall of the sink 16. In some embodiments, the lower wall of the third oil drain hole 17 can be flush with the bottom wall of the sink 16; in other embodiments, the lower wall of the third oil drain hole 17 is lower than the bottom wall of the sink 16.

[0061] In this embodiment, the lower wall of the third oil hole 17 is lower than the bottom wall of the sink 16, that is, the guide part 171 is sunk a certain size relative to the sink 16, making it easier for the lubricating oil to collect.

[0062] Furthermore, the bottom wall of the settling trough 16 is also recessed with two second mating grooves 19, which correspond to the opposite sides of the exhaust valve plate 2. After the exhaust valve plate 2 is installed, the exhaust valve plate 2 can cover part of the groove opening of the second mating groove 19, that is, the second mating groove 19 is not completely covered. The groove depth of the second mating groove 19 is small. The two second mating grooves 19 are set near the exhaust hole 11. Their purpose is to provide a certain air-carrying space during the closing process of the exhaust valve plate 2, so that the airflow when the exhaust valve plate 2 is closed can be discharged from the second mating groove 19, thereby reducing the resistance of the exhaust valve plate 2 in closing.

[0063] Taking the upper surface of valve seat 1 as the mounting surface 10 as an example, the combination of the oil drain channel in each embodiment will be described.

[0064] In the first embodiment, please refer to Figures 4 to 5 Two parallel first oil drain holes 13 are provided on the valve seat 1, thus forming two first oil drain channels 30. The two first oil drain holes 13 are located on opposite sides of the exhaust valve plate 2. The first oil drain holes 13 are drilled from the side wall of the valve seat 1, leading to the outside of the muffler. When they extend to the mounting groove 12, since the width of the mounting groove 12 is greater than the distance between the two first oil drain holes 13, the portion of the first oil drain hole 13 within the first mounting groove 12 is side-open, thus forming a first oil drain groove 14. In this embodiment, lubricating oil is only discharged into the compressor housing through the first oil drain channel 30. The oil near the fixed end 21 of the exhaust valve plate 2 is discharged using the pressure difference inside and outside the muffler. The cross-sectional area of ​​the first oil drain hole 13 is estimated based on the pressure difference inside and outside the muffler. The thickness of the valve seat 1, structural strength, flow rate, and degree of refrigerant leakage need to be considered.

[0065] In the second embodiment, please refer to Figures 6 to 7 The valve seat 1 is provided with two first oil drain holes 13 and two second oil drain holes 15, forming two first oil drain channels 30 and two second oil drain channels 40. The two first oil drain holes 13 are the same as in the first embodiment. One end of each of the two second oil drain holes 15 is connected to the upper surface of the valve seat 1, and the other end is inclined downwards towards the exhaust port 11. The ends of the first oil drain holes 13 and second oil drain holes 15 corresponding to the fitting clearance 20 are connected. In this embodiment, the first oil drain channel 30 serves as the main oil drain channel. When a large amount of lubricating oil accumulates, some of the lubricating oil can enter the muffler along the second oil drain channel 40. The cross-sectional area of ​​the second oil drain hole 15 is estimated based on the pressure difference inside and outside the muffler. The thickness of the valve seat 1, structural strength, flow rate, and the degree of refrigerant leakage need to be considered.

[0066] In the third embodiment, please refer to Figures 8 to 10The valve seat 1 is provided with two first oil drain holes 13 and one third oil drain hole 17, forming two first oil drain channels 30 and one third oil drain channel 50. The two first oil drain channels 30 are the same as in the first embodiment. The third oil drain channel 50 is close to the movable end 22 of the exhaust valve plate 2. The first oil drain holes 13 and the third oil drain hole 17 are parallel. Both the third oil drain hole 17 and the first oil drain hole 13 are connected to the peripheral side surface of the valve seat 1. In this embodiment, the lubricating oil accumulated near the movable end 22 of the exhaust valve plate 2 is discharged through the third oil drain channel 50, and the lubricating oil accumulated near the fixed end 21 of the exhaust valve plate 2 is discharged through the two first oil drain channels 30. The cross-sectional area of ​​the third oil drain hole 17 is estimated based on the pressure difference inside and outside the muffler. The thickness of the valve seat 1, the depth of the groove 16, the structural strength of the valve seat 1, the flow rate, and the degree of refrigerant leakage need to be considered.

[0067] The present invention also proposes a compressor, which includes an exhaust valve assembly 100. The specific structure of the exhaust valve assembly 100 is as described in the above embodiments. Since this compressor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. The compressor also includes a bearing and a muffler. The bearing is mounted on the crankshaft, and the muffler is located at one end of the bearing along its axial direction. The bearing forms a valve seat 1, and the end face of the bearing facing the muffler forms a mounting surface 10.

[0068] It should be noted that in the rotor compressor structure, upper and lower bearings are correspondingly provided. When the upper bearing serves as valve seat 1, its upper surface forms mounting surface 10. When the lower bearing serves as valve seat 1, its lower surface serves as mounting surface 10. Since the compressor is entirely sealed, its internal operation mainly relies on pressure difference, and is less affected by gravity. Therefore, during compressor operation, both the upper and lower bearings are equipped with the aforementioned exhaust valve assembly 100.

[0069] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural transformations made using the contents of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of the present invention.

Claims

1. An exhaust valve assembly for a compressor, comprising: The valve seat comprises: a valve seat, one end of which in the thickness direction is a mounting surface, a vent hole is provided on the mounting surface for connecting the compression chamber of the compressor, a mounting groove is recessed on the mounting surface and is arranged in the vent hole, and the valve seat is formed with a first oil discharge channel; an exhaust valve plate, which has a fixed end and a movable end arranged oppositely in the length direction, the fixed end is arranged in the mounting groove, the movable end can cover the vent hole and can open the vent hole, and the side of the exhaust valve plate and the inner side wall of the mounting groove define a fitting gap; one end of the first oil discharge channel is connected to the fitting gap, and the other end is arranged through the valve seat to guide the lubricating oil in the fitting gap out.

2. The exhaust valve assembly of claim 1, wherein, The peripheral surface of the valve seat is provided with a first oil discharge hole connected to the mounting groove; The first oil discharge channel comprises the first oil discharge hole.

3. The exhaust valve assembly of claim 2, wherein, The side wall of the mounting groove for defining the fitting gap is recessed with a first oil discharge groove, and the first oil discharge groove is connected to the first oil discharge hole; The first oil discharge channel further comprises the first oil discharge groove.

4. The exhaust valve assembly of claim 3, wherein, The bottom wall of the first oil discharge hole and / or the first oil discharge groove is arranged obliquely, and in the direction away from the vent hole of the valve seat, it is arranged gradually away from the vent hole.

5. The exhaust valve assembly of claim 3, wherein, The first oil discharge groove and the first oil discharge hole are arranged in a straight line.

6. The exhaust valve assembly of claim 1, wherein, The valve seat is further formed with a second oil discharge channel, one end of which is connected to the fitting gap, and the other end is used to connect the inner cavity of the muffler.

7. The exhaust valve assembly of claim 6, wherein, The valve seat is provided with a second oil discharge hole, which is inclined in the direction of the groove bottom of the mounting groove along the slot opening of the mounting groove, one end of the second oil discharge hole penetrates the mounting surface and is used to correspond to the inlet of the muffler, and the other end extends to the mounting groove and corresponds to the fitting gap; The second oil discharge channel comprises the second oil discharge hole.

8. The exhaust valve assembly of claim 7, wherein, The second oil discharge hole is arranged through the side wall of the mounting groove to communicate with the mounting groove; and / or, The included angle between the second oil discharge hole and the mounting surface is a, a≤30°.

9. The exhaust valve assembly of claim 7, wherein, The side wall of the mounting groove for defining the fitting gap is recessed with a first oil discharge groove, the peripheral surface of the valve seat is provided with a first oil discharge hole connected to the first oil discharge groove, and the first oil discharge channel comprises the first oil discharge groove and the first oil discharge hole; The first oil discharge groove and the second oil discharge hole are arranged in communication near the end of the fitting gap.

10. The exhaust valve assembly of claim 6, wherein, The exhaust valve plate forms a fitting side along the width direction of the two opposite sides, and the fitting side and the inner side wall of the mounting groove define the fitting gap, wherein: The first oil discharge channel and the second oil discharge channel are correspondingly arranged two; or The first oil discharge channel and the second oil discharge channel are respectively arranged corresponding to the two fitting sides.

11. The exhaust valve assembly of claim 1, wherein, The valve seat is formed with a third oil discharge channel, one end of which is arranged close to the vent hole to guide the lubricating oil accumulated on the side of the movable end out.

12. The exhaust valve assembly of claim 10, wherein, The mounting surface is provided with a sink, and the bottom wall of the sink is provided with the mounting groove and the vent hole; A third oil discharge hole is formed in the side surface of the valve seat, the third oil discharge hole communicates with the sink, and an end of the third oil discharge hole is spaced from the exhaust hole. The third oil discharge passage includes the third oil discharge hole.

13. The exhaust valve assembly of claim 12, wherein, An end of the third oil discharge hole extends into the sink to form a guide portion.

14. A compressor characterized by, The compressor further includes a bearing mounted on the crankshaft and a muffler provided at an end of the bearing in an axial direction thereof, the bearing forms the valve seat, and an end surface of the bearing toward the muffler forms the mounting surface.

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