Exhaust valve, exhaust valve and compressor

Abstract

The application provides an exhaust valve plate, an exhaust valve and a compressor. The exhaust valve plate has a two-layer composite structure, which comprises a metal valve plate with a first rigidity and a plastic valve plate with a second rigidity, wherein the first rigidity is greater than the second rigidity; the plastic valve plate is made of a high polymer resin material and is combined and formed on one side facing the exhaust port. The application improves the impact fatigue life of the exhaust valve plate, reduces the noise generated when the exhaust valve plate hits the exhaust valve seat, and is beneficial to reducing the overall noise of the compressor.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and more specifically, to an exhaust valve plate, an exhaust valve, and a compressor. Background Technology

[0002] Existing compressors typically utilize flexible exhaust valve plates in the exhaust assembly to flexibly control the discharge of high-pressure gas from the cylinder through the exhaust port. That is, when the gas pressure in the cylinder is too high, the exhaust valve plate will bend under pressure, thereby opening the exhaust port to allow gas to be discharged. When the gas pressure is insufficient to open the exhaust valve plate, the exhaust valve plate will always close the exhaust port.

[0003] Currently, exhaust valve plates are generally made of metal materials, such as stainless steel. However, metal exhaust valve plates have significant frequency response characteristics and generate considerable vibration and noise. Furthermore, in actual compressor operation, the valve seat is often made of cast iron, while the valve plate is often made of stainless steel. The valve plate constantly impacts the valve seat, and due to its high rigidity, it is prone to brittle fracture. Therefore, further optimization of the exhaust valve plate structure is still needed at this stage. Summary of the Invention

[0004] In view of this, the present invention provides an exhaust valve plate, an exhaust valve, and a compressor, which solves the problems of easy brittle fracture and high vibration noise of the exhaust valve plate in the prior art.

[0005] According to one aspect of the present invention, an exhaust valve plate is provided for use in a compressor, the compressor having an exhaust port, the exhaust valve plate having a two-layer composite structure, the two-layer composite structure comprising:

[0006] Metal valve plate, having a first stiffness; and

[0007] The plastic valve plate has a second stiffness, wherein the first stiffness is greater than the second stiffness; the plastic valve plate is made of a polymer resin material.

[0008] The plastic valve plate is composite-molded on the side facing the exhaust port.

[0009] Preferably, the polymer resin material is a polyetheretherketone (PEEK) material.

[0010] Preferably, the thickness of the plastic valve plate is greater than the thickness of the metal valve plate.

[0011] Preferably, the ratio of the thickness of the plastic valve plate to that of the metal valve plate is in the range of 2 to 12.

[0012] Preferably, the metal valve plate includes a first fixed portion, a first narrow portion, and a first free portion connected in sequence, and the plastic valve plate includes a second fixed portion, a second narrow portion, and a second free portion connected in sequence; the first free portion and the second free portion both cover the exhaust port, and the first fixed portion and the second fixed portion are both fixedly connected to the compressor;

[0013] The ratio of the length of the first fixing part to the length of the metal valve plate is less than the ratio of the length of the second fixing part to the length of the plastic valve plate.

[0014] Preferably, the width of the first narrow portion near the first fixed portion is smaller than the width of the first narrow portion near the first free portion.

[0015] Preferably, the width of the first narrow portion gradually decreases along the direction from the first free portion to the first fixed portion.

[0016] Preferably, the width of the second narrow portion remains constant along the direction from the second free portion to the second fixed portion.

[0017] According to another aspect of the present invention, an exhaust valve is provided, comprising an exhaust valve seat and any of the above-mentioned exhaust valve plates, wherein the exhaust valve seat is provided with an exhaust hole and a mounting groove, the exhaust hole and the exhaust port are correspondingly arranged, and the exhaust valve plate is fixedly connected in the mounting groove.

[0018] According to another aspect of the invention, a compressor is provided, including the aforementioned exhaust valve.

[0019] The advantages of this invention compared to the prior art are as follows:

[0020] The exhaust valve plate, exhaust valve, and compressor provided by this invention adopt a composite structure composed of two layers of materials with different stiffnesses, and the bottom layer is made of high molecular resin material, which improves the impact fatigue life of the exhaust valve plate; and reduces the noise generated when the exhaust valve plate hits the valve seat, thereby helping to reduce the overall noise of the compressor; and makes the valve plate open more quickly when venting and close more promptly when resetting, which helps to improve the overall performance of the compressor. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0022] Figure 1 This is a schematic diagram of the structure of the metal valve plate in the exhaust valve plate disclosed in an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the plastic valve plate in the exhaust valve plate disclosed in an embodiment of the present invention;

[0024] Figure 3 This is a cross-sectional view of the exhaust valve plate disclosed in an embodiment of the present invention. Detailed Implementation

[0025] Example embodiments will now be described more fully with reference to the accompanying drawings. However, these example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a full understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of the specific details described, or other materials, devices, etc., can be used. In other instances, well-known technical solutions are not shown or described in detail to avoid obscuring aspects of this disclosure. The same reference numerals in the figures denote the same or similar structures, and therefore their detailed descriptions are omitted.

[0026] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including,” “having,” and “have” are used to indicate an open-ended inclusion meaning and that other elements / components / etc. may exist in addition to the listed elements / components / etc.

[0027] like Figures 1 to 3 As shown, this invention discloses an exhaust valve plate applied to a compressor. The compressor has an exhaust port, which can be specifically located in the upper cylinder head and / or lower cylinder head. The exhaust valve plate has a two-layer composite structure, comprising a metal valve plate 11 and a plastic valve plate 12. The metal valve plate 11 has a first stiffness. The plastic valve plate 12 has a second stiffness. The first stiffness is greater than the second stiffness. The plastic valve plate 12 is made of a polymer resin material. The plastic valve plate 12 is composite-molded on the side facing the exhaust port. That is, the plastic valve plate 12 is located on the side of the metal valve plate 11 closer to the compressor exhaust port, and the metal valve plate 11 is located on the side of the plastic valve plate 12 away from the exhaust port.

[0028] Generally, an exhaust valve seat is provided at the compressor's exhaust port to accommodate an exhaust valve plate. The exhaust valve seat has an exhaust hole and a mounting groove. The exhaust hole corresponds to the exhaust port, and the mounting groove accommodates the exhaust valve plate and is fixedly connected to one end of the valve plate. When the pressure in the exhaust chamber is low, the exhaust valve plate covers the exhaust hole on the exhaust valve seat and the exhaust port on the compressor, sealing the cylinder cavity. When the pressure in the exhaust chamber is high and reaches the exhaust pressure, the exhaust airflow in the exhaust chamber pushes the exhaust valve plate, causing it to open and discharge the compressed refrigerant.

[0029] In existing technologies, valve plates are mostly made of stainless steel, while exhaust valve seats are mostly made of cast iron. The constant impact of the valve plate on the exhaust valve seat, coupled with the valve plate's high rigidity, makes it prone to brittle fracture. This invention achieves a variable stiffness valve plate assembly by adding a layer of plastic valve plate 12 made of polymer resin between the metal valve plate 11 and the exhaust valve seat. This ensures that the exhaust valve plate's stiffness meets service life requirements and improves its impact fatigue life. Simultaneously, it avoids the significant noise generated by the metal valve plate 11 directly impacting the exhaust valve seat, reducing the overall noise of the compressor.

[0030] In this embodiment, the relatively less rigid plastic valve plate 12 is positioned on the side closer to the exhaust port, which facilitates more timely opening of the exhaust valve plate during the exhaust process. The relatively more rigid metal valve plate 11 is positioned on the side farther from the exhaust port, which facilitates more rapid reset of the exhaust valve plate after exhaust is completed.

[0031] In one specific embodiment of the present invention, the lower surface of the metal valve plate 11 and the upper surface of the plastic valve plate 12 are tightly joined to form a whole, and the joining method can be, for example, by adhesive bonding.

[0032] In this embodiment, the polymer resin material used in the plastic valve plate 12 is polyetheretherketone (PEEK). PEEK is a polymer composed of repeating units containing one ketone bond and two ether bonds in its main chain structure, belonging to the category of special polymer materials. It possesses characteristics such as low hardness and high damping, and is a type of semi-crystalline polymer material.

[0033] The high damping properties of polyetheretherketone (PEEK) material can reduce the impact force when the valve plate strikes the exhaust valve seat, thereby improving the impact fatigue life of the valve plate. The low hardness of PEEK material also contributes to improving the impact fatigue life of the valve plate. Therefore, the exhaust valve plate formed by the composite of the metal valve plate 11 and the plastic valve plate 12 disclosed in this embodiment can help improve the overall reliability of the compressor.

[0034] In this embodiment, the tensile strength of the polyetheretherketone material corresponding to the plastic valve plate 12 is 94MPa to 103MPa, the flexural strength is 145MPa, and the tensile modulus is 3.8GPa, but this application is not limited thereto.

[0035] As a preferred embodiment of this application, based on the above embodiments, such as Figure 1 As shown, the aforementioned metal valve plate 11 includes a first fixed portion 111, a first narrow portion 112, and a first free portion 113 connected in sequence. Figure 2 As shown, the plastic valve plate 12 includes a second fixed portion 121, a second narrow portion 122, and a second free portion 123 connected in sequence. When no venting is performed, both the first free portion 113 and the second free portion 123 cover the vent hole on the vent valve seat and the vent port on the compressor. When the cylinder vents, the vent hole and vent port are opened. Both the first fixed portion 111 and the second fixed portion 121 are fixedly connected to the compressor.

[0036] The ratio of the length of the first fixing part 111 to the length of the metal valve plate 11 is less than the ratio of the length of the second fixing part 121 to the length of the plastic valve plate 12. Specifically, the length of the metal valve plate 11 along the first direction is the first length, and the length of the plastic valve plate 12 along the first direction is the second length. The first direction is the length extension direction of the exhaust valve plate. The length of the first fixing part 111 along the first direction is the third length, and the length of the second fixing part 121 along the first direction is the fourth length. The ratio of the third length to the first length is less than the ratio of the fourth length to the second length. This ensures that the resistance caused by the metal valve plate 11 is smaller when the exhaust valve plate opens, the valve plate opens more promptly, and the exhaust efficiency of the compressor is improved.

[0037] The width of the first narrow portion 112 near the first fixed portion 111 is smaller than the width of the first narrow portion 112 near the first free portion 113. More preferably, the width of the first narrow portion 112 gradually decreases along the direction from the first free portion 113 to the first fixed portion 111. This also reduces the resistance when the exhaust valve plate opens, improving exhaust efficiency. Furthermore, after exhaust is complete, it ensures that the valve plate resets and closes more quickly, further improving the performance of the compressor. The aforementioned width is the length of the first narrow portion 112 in a second direction, which is a direction perpendicular to the first direction on the plane containing the upper surface of the metal valve plate 11.

[0038] During compressor operation, the exhaust valve plate is subjected to continuous impact due to constant bending and resetting. The narrow portion of the valve plate, i.e., the transition connection area, experiences relatively concentrated stress. Therefore, in this embodiment, the second narrow portion 122 of the plastic valve plate 12 maintains a constant width along the direction from the second free portion 123 to the second fixed portion 121. This helps ensure the service life of the plastic valve plate 12 and mitigates impact fatigue fracture.

[0039] In another preferred embodiment, the first length is equal to the second length.

[0040] In this embodiment, the thickness of the plastic valve plate 12 is greater than the thickness of the metal valve plate 11. Furthermore, the thickness ratio between the plastic valve plate 12 and the metal valve plate 11 ranges from 2 to 12. In this embodiment, when the metal valve plate 11 and the plastic valve plate 12 are made with the aforementioned specific thickness ratio, the resistance when the exhaust valve plate opens is lower, enabling faster opening and thus improving compressor performance.

[0041] In a preferred embodiment of this application, the thickness of the exhaust valve plate is 0.9 mm to 1.6 mm. For example, the thickness of the exhaust valve plate can be 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, or 1.5 mm.

[0042] In a preferred embodiment of this application, the thickness of the metal valve plate 11 is 0.1 mm to 0.4 mm. The thickness of the plastic valve plate 12 is 0.8 mm to 1.2 mm. For example, the thickness of the metal valve plate 11 can be 0.1 mm, 0.2 mm, 0.3 mm, or 0.4 mm. The thickness of the plastic valve plate 12 can be 0.8 mm, 1 mm, or 1.2 mm.

[0043] In the exhaust valve plate of this embodiment, after a lot of research and experimentation, it was found that when the exhaust valve plate, metal valve plate 11 or plastic valve plate 12 adopts the above-mentioned thickness parameters, the exhaust valve plate can open more quickly during the exhaust process and the valve plate can reset and close more promptly, which is beneficial to further improve the performance of the compressor.

[0044] It should be noted that the exhaust valve plate and the valve plate mentioned above in this embodiment are the same component.

[0045] This composite structure combines the advantages of metal valve plate 11 and polymer resin material, retaining the rigidity required by the exhaust valve plate to ensure sealing performance during compression, while reducing vibration and noise when the exhaust valve plate rebounds to the exhaust valve seat.

[0046] This invention also provides an exhaust valve, which includes an exhaust valve seat and an exhaust valve plate as described in any of the above embodiments. Detailed structural features and advantages of the exhaust valve plate can be found in the descriptions of the above embodiments, and will not be repeated here. The exhaust valve seat is disposed at the exhaust port, and has an exhaust hole and a mounting groove. The exhaust hole and the exhaust port are correspondingly disposed. The exhaust valve plate is fixedly connected to the mounting groove, that is, the first fixing part and the second fixing part of the exhaust valve plate are fixedly connected to the mounting groove. The first free part and the second free part of the exhaust valve plate cover the exhaust hole.

[0047] This invention also provides a compressor that includes the aforementioned exhaust valve.

[0048] In summary, the exhaust valve plate, exhaust valve, and compressor of the present invention have at least the following advantages:

[0049] The exhaust valve plate, exhaust valve, and compressor disclosed in this embodiment adopt a composite structure composed of two layers of materials with different stiffnesses. The bottom layer is made of high molecular resin material, which improves the impact fatigue life of the exhaust valve plate and reduces the noise generated when the exhaust valve plate hits the exhaust valve seat, thereby helping to reduce the overall noise of the compressor. It also makes the valve plate open more quickly when venting and close more promptly when resetting, which helps to improve the overall performance of the compressor.

[0050] In the description of this invention, it should be understood that the terms "bottom," "longitudinal," "lateral," "upper," "lower," "front," "rear," "vertical," and "horizontal," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the structure 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 of the invention. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more, and "several" means one or more.

[0051] In the description of this specification, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0052] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. An exhaust valve plate for use in a compressor, said compressor being provided with an exhaust port, said compressor comprising an exhaust valve seat, said exhaust valve seat being provided with an exhaust hole, characterized in that, The exhaust valve plate has a two-layer composite structure, which comprises: a metal valve plate having a first rigidity; and a plastic valve plate having a second rigidity, the first rigidity being greater than the second rigidity; the plastic valve plate is made of a high polymer resin material; the plastic valve plate is integrally formed on a side facing the exhaust port, the lower surface of the metal valve plate and the upper surface of the plastic valve plate being tightly combined to form an integral whole; the thickness of the plastic valve plate is greater than the thickness of the metal valve plate; the metal valve plate comprises a first fixed portion, a first narrow portion and a first free portion connected in sequence, and the plastic valve plate comprises a second fixed portion, a second narrow portion and a second free portion connected in sequence; the first free portion and the second free portion cover the exhaust hole of the exhaust valve seat and the exhaust port of the compressor when exhaust is not performed; a first direction is a length extension direction of the exhaust valve plate, the length of the metal valve plate along the first direction is a first length, the length of the plastic valve plate along the first direction is a second length, the length of the first fixed portion along the first direction is a third length, and the length of the second fixed portion along the first direction is a fourth length; the ratio of the third length to the first length is less than the ratio of the fourth length to the second length; in a direction of the first free portion pointing to the first fixed portion, the width of the first narrow portion gradually decreases; wherein the width of the first narrow portion is the length of the first narrow portion in a second direction, and the second direction is a direction perpendicular to the first direction in the plane where the upper surface of the metal valve plate is located.

2. The exhaust valve blade of claim 1, wherein The high polymer resin material is a polyether ether ketone material.

3. The exhaust valve blade of claim 1, wherein, The ratio of the thickness between the plastic valve plate and the metal valve plate ranges from 2 to 12.

4. The exhaust valve blade of claim 1, wherein Both the first fixed portion and the second fixed portion are fixedly connected with the compressor.

5. The exhaust valve blade of claim 1, wherein, The width of the second narrow portion remains unchanged in a direction of the second free portion pointing to the second fixed portion.

6. An exhaust valve characterized by, An exhaust valve seat and an exhaust valve plate as claimed in any one of claims 1 to 5 are provided with an exhaust hole and a mounting groove, the exhaust hole and the exhaust port are correspondingly arranged, and the exhaust valve plate is fixedly connected in the mounting groove.

7. A compressor characterized by, An exhaust valve as claimed in claim 6 is provided.

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