An oil-free compressor valve sealing element with an elastic compensating sheet

Abstract

The embodiment of the present application provides an oil-free lubrication compressor air valve sealing element with an elastic compensation sheet, which is installed between a valve cover and a valve seat of an air valve, and comprises a valve sheet and an elastic compensation sheet; the valve sheet is made of non-metallic material, a group of annular flow channels are concentrically distributed on the valve sheet with the center of the valve sheet as the center, and a center part of the valve sheet adopts an elastic arm structure, so that the opening and closing of the valve sheet in the air valve is a frictionless movement, and therefore the valve sheet is suitable for oil-free lubrication compressors; the elastic compensation sheet is arranged on one side or both sides of the elastic arm structure, can provide elastic compensation force to the valve sheet, and can adjust the elasticity of the elastic arm of the valve sheet by changing the thickness and rigidity of the elastic compensation sheet, and simultaneously adjust the lift of the air valve; the elastic compensation sheet is completely attached to the elastic arm of the valve sheet, can play an auxiliary protection role on the elasticity of the elastic arm, and can also adjust the elastic force required for the opening and closing of the valve sheet.

Description

Technical Field

[0001] This utility model relates to the field of reciprocating compressor valve design, processing, and manufacturing, specifically to an oil-free lubricated compressor valve sealing element with an elastic compensation plate. Background Technology

[0002] Reciprocating compressors, also known as piston compressors, utilize valves to control air intake and exhaust during piston movement. These valves, including intake and exhaust valves, are installed in valve holes in the compressor cylinder, connecting to the compressor's intake and exhaust chambers respectively. As the compressor piston reciprocates, the intake and exhaust valves open and close sequentially, completing the four processes of intake, compression, exhaust, and expansion, transporting gas from the intake chamber to the exhaust chamber. Valvees are vulnerable components of reciprocating compressors, and their lifespan and performance directly affect the compressor's efficiency and reliability. Traditional valves mainly consist of a valve seat, a sealing element (or valve plate), and a valve cover (or lift limiter). Valve plates can be classified by material as steel or non-metallic, and by structure as flexible arm valves or center-guided valves. Flexible arm valves are commonly used in oil-free lubrication compressors and are generally made of steel.

[0003] Existing technologies have the following drawbacks: Mesh valves use mesh valve plates, springs, and buffer plates. Although they can ensure that all air passages open and close simultaneously when the valve is working, the positioning and clamping of the valve plate relies on its inner ring. The valve plate can only open on the outer ring of the mesh valve plate. Under the action of gas pressure difference, the valve plate opens by elastic deformation. Therefore, the mesh valve plate can only be made thin and can only be made of metal materials. The opening range of the valve plate is naturally small, resulting in large flow and pressure losses, increased power consumption, and poor compressor economy. In addition, frequent opening and closing can cause bending cracks at the elastic deformation points of the valve plate, making it prone to breakage and failure, thus reducing the life of the valve. Furthermore, the structure of the mesh valve plate is relatively complex and must be manufactured with special molds, resulting in high costs.

[0004] Chinese patent CN203570535U, entitled "An Oil-Free Lubricated Piston Compressor Valve," discloses an oil-free lubricated piston compressor valve comprising a lift limiter, a stud inside the lift limiter, a nut on the stud, a valve seat on the stud between the nut and the lift limiter, a valve plate between the valve seat and the lift limiter, and a valve spring pressing against the lift limiter and the valve plate to ensure the valve plate is tightly against the valve seat. The valve plate, filled with PTFE or polyetheretherketone material, comprises several concentric rings, with connecting ribs and ventilation grooves between adjacent concentric rings; the lift limiter has a positioning pin that passes through a positioning guide hole on the valve plate and is clearance-fitted with the positioning guide hole. Although the above patents use non-metallic materials to make valve plates, solving the application problem of valve plates in oil-free lubricated compressors, they do not completely solve the following shortcomings of the existing technology: The mesh valve uses mesh valve plates, springs and buffer plates. Although it can ensure that the air passages of each ring open and close simultaneously when the valve is working, the positioning and pressing of the valve plate is based on its inner ring. The valve plate can only be opened by the outer ring of the mesh valve plate. Under the action of gas pressure difference, the valve plate opens by elastic deformation. Therefore, the mesh valve plate can only be made thinner and can only be made of metal materials. Utility Model Content

[0005] In view of this, the present invention provides an oil-free lubricated compressor valve sealing element with an elastic compensation plate, which solves the technical problem that the mesh valve plate of the prior art can only be made thin and can only be made of metal materials. At the same time, it also solves the problem of the synchronization of the opening and closing movements of the inner ring part and the outer ring part of the valve plate.

[0006] This utility model provides a sealing element for an oil-free lubricated compressor valve with an elastic compensation plate, which is installed between the valve cover and the valve seat of the valve. The sealing element includes a valve plate and an elastic compensation plate. The valve plate is made of non-metallic material and has a set of annular flow channels concentrically distributed around the center of the valve plate. The central part of the valve plate adopts an elastic arm structure. The elastic compensation plate is disposed on one or both sides of the elastic arm structure and fits against the elastic arm of the valve plate to provide elastic compensation force to the valve plate.

[0007] Optionally, the elastic compensation plate has a mounting hole at its center, and the outer ring of the elastic compensation plate has two elastic arms that extend circumferentially and are centrally symmetrical, and the elastic arms of the elastic compensation plate are correspondingly fitted with the elastic arms of the valve plate.

[0008] Optionally, the elastic compensation sheet is made of spring steel, and the thickness of the elastic compensation sheet is 0.2mm, 0.3mm, 0.4mm, or 0.5mm.

[0009] Optionally, several of the aforementioned elastic compensation plates may be used in combination.

[0010] Optionally, the non-metallic material is carbon fiber reinforced polyetheretherketone or glass fiber reinforced nylon.

[0011] Optionally, the valve cover and the valve seat are assembled as one unit, the valve plate is installed between the valve cover and the valve seat, and is capable of reciprocating between the two; a closing spring is provided between the valve cover and the valve plate, the closing spring being used to apply the preload required for sealing to the valve plate.

[0012] Optionally, the sealing element further includes a buffer plate, on which a set of annular flow channels are concentrically distributed with the center of the buffer plate as the center; the buffer plate is disposed between the closing spring and the valve plate, and the two ends of the closing spring abut against the valve cover and the buffer plate respectively.

[0013] The present invention has the following advantages: the central part of the valve plate adopts an elastic arm structure, which makes the opening and closing of the valve plate within the valve a frictionless motion, thus making it suitable for oil-free lubricated compressors; elastic compensation plates are provided on one or both sides of the elastic arm structure of the valve plate, and the elasticity of the valve plate elastic arm can be adjusted by changing the thickness and stiffness of the elastic compensation plates, thereby adjusting the lift of the valve; the elastic compensation plates are completely fitted with the elastic arm of the valve plate, which can play an auxiliary protective role in the elasticity of the elastic arm, and can also adjust the elastic force required for the opening and closing of the valve plate, solving the technical problem that the mesh valve plate of the prior art can only be made thin and can only be made of metal materials, and also solving the problem of the synchronization of the opening and closing motion of the inner ring part and the outer ring part of the valve plate. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the structure of the elastic compensation sheet in an embodiment of this utility model; The numbers in the diagram represent: 1. Valve cover; 2. Valve seat; 3. Valve plate; 4. Elastic compensation plate; 5. Center bolt; 6. Locking nut; 7. Closing spring; 8. Buffer plate. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0017] The following are preferred embodiments of this utility model: Taking a BOG reciprocating compressor as an example, its speed is constant at 495 rpm, shaft power is 1564 kW, first-stage inlet pressure is 0.13 MPa(a), first-stage inlet temperature is -139℃; second-stage inlet pressure is 0.35 MPa(a), second-stage inlet temperature is -76℃; second-stage outlet pressure is 1.26 MPa(a), outlet temperature is 25℃. Under low-temperature conditions, the compressor cylinder is oil-free lubricated. To ensure the service life of the compressor valves under these conditions, a common solution is to use a set of centrally fixed mesh valve plates with metal buffer plates as the valve sealing element. These centrally fixed mesh valve plates are typically made of a single piece of low-temperature metal plate material. The elastic arm at the center of the valve plate compensates for the valve plate displacement, and the metal buffer plate reduces the impact generated by the opening and closing of the metal valve plate. However, the centrally fixed metal valve plate structure makes the stress fatigue generated by the opening and closing of the valve plate more severe. The metal elastic arm is prone to breakage under high-frequency alternating stress, especially when the compressor speed is high and the compressor is operating at low temperatures.

[0018] Therefore, embodiments of this utility model provide a sealing element for an oil-free lubricated compressor valve with an elastic compensating plate, which is installed between the valve cover 1 and the valve seat 2 of the valve for opening and closing the gas flow passage of the valve. Please refer to [link to relevant documentation]. Figure 1 As shown, the sealing element includes a valve plate 3 and an elastic compensating plate 4. The lift limiter of the air valve, or valve cover 1, is assembled with the valve seat 2 by a central bolt 5 and a locking nut 6. The valve plate 3 is installed between the valve cover 1 and the valve seat 2 and can reciprocate between the two to realize the opening and closing of the air valve.

[0019] In this embodiment, the valve plate 3 has a standardized circular design and is made of a non-metallic material. For reference, this non-metallic material can be carbon fiber reinforced polyetheretherketone (PEEK) or glass fiber reinforced nylon. A set of annular flow channels concentrically distributed around the center of the valve plate 3 are machined on the valve plate 3. These annular flow channels, together with the flow channels on the valve cover 1 and valve seat 2, form the gas flow channel of the valve. The central portion of the valve plate 3 adopts an elastic arm structure, making the opening and closing of the valve plate 3 within the valve a frictionless motion, thus suitable for oil-free lubricated compressors.

[0020] Elastic compensation plates 4 are installed on one or both sides of the elastic arm structure of valve plate 3. The elastic compensation plates 4 are in contact with the elastic arm of valve plate 3, providing elastic compensation force to valve plate 3. By changing the thickness and stiffness of the elastic compensation plates 4, the elasticity of the elastic arm of valve plate 3 can be adjusted, thereby adjusting the lift of the air valve. The elastic compensation plates 4 are fully in contact with the elastic arm of valve plate 3, providing auxiliary protection for the elasticity of the elastic arm of valve plate 3, and also allowing adjustment of the elastic force required for valve plate 3 to open and close.

[0021] like Figure 2 As shown, in this embodiment, the elastic compensation piece 4 has a mounting hole at its center, and the outer ring of the elastic compensation piece 4 has two elastic arms that extend circumferentially and are centrally symmetrical. The elastic arms of the elastic compensation piece 4 correspond to and fit with the elastic arms of the valve piece 3.

[0022] In this embodiment, the elastic compensating plate 4 is made of spring steel, and its thickness is 0.2mm, 0.3mm, 0.4mm, or 0.5mm. Depending on the requirements of different compressor operating conditions, the elastic compensating plates 4 can be stacked to obtain different valve lift and auxiliary elastic force.

[0023] A closing spring 7 is provided between the valve cover 1 and the valve plate 3. The closing spring 7 can be a helical spring or a disc spring, used to apply the preload required for sealing to the valve plate 3. Further, in this embodiment, the sealing element also includes a buffer plate 8, on which a set of annular flow channels are concentrically distributed around the center of the buffer plate 8. The buffer plate 8 is disposed between the closing spring 7 and the valve plate 3. One end of the closing spring 7 is disposed in the cavity of the valve cover 1, and the other end of the closing spring 7 is loaded onto the buffer plate 8, applying the preload required for sealing to the valve plate 3 through the buffer plate 8. In this embodiment, the closing spring 7 is arranged on the outer ring of the valve cover 1, and together with the elastic compensation plate 4 in the central part, provides the elastic force required for opening and closing the valve.

[0024] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this utility model. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A sealing element for an oil-free lubricated compressor valve with an elastic compensating plate, which is installed between the valve cover and the valve seat of the valve, characterized in that: The sealing element includes a valve plate and an elastic compensation plate; the valve plate is made of non-metallic material and has a set of annular flow channels concentrically distributed around the center of the valve plate, and the central part of the valve plate adopts an elastic arm structure; the elastic compensation plate is disposed on one or both sides of the elastic arm structure and fits against the elastic arm of the valve plate to provide elastic compensation force to the valve plate.

2. The sealing element for an oilless compressor valve with an elastic compensating plate according to claim 1, characterized in that: The elastic compensating plate has a mounting hole at its center, and two elastic arms extending circumferentially and being centrally symmetrical around its outer ring. The elastic arms of the elastic compensating plate are correspondingly fitted to the elastic arms of the valve plate.

3. The sealing element for an oilless compressor valve with an elastic compensating plate according to claim 1, characterized in that: The elastic compensating sheet is made of spring steel, and its thickness is 0.2mm, 0.3mm, 0.4mm, or 0.5mm.

4. The sealing element for an oilless compressor valve with an elastic compensating plate according to claim 1, characterized in that: Several of the aforementioned elastic compensation plates are used in combination.

5. A sealing element for an oilless compressor valve with an elastic compensating plate according to claim 1, characterized in that: The non-metallic material is polyetheretherketone reinforced with carbon fiber or nylon reinforced with glass fiber.

6. A sealing element for an oilless compressor valve with an elastic compensating plate according to any one of claims 1-5, characterized in that: The valve cover and the valve seat are assembled as one piece, and the valve plate is installed between the valve cover and the valve seat and can reciprocate between the two; a closing spring is provided between the valve cover and the valve plate, and the closing spring is used to apply the preload required for sealing to the valve plate.

7. A sealing element for an oilless compressor valve with an elastic compensating plate according to claim 6, characterized in that: The sealing element further includes a buffer plate, on which a set of annular flow channels are concentrically distributed with the center of the buffer plate as the center; the buffer plate is disposed between the closing spring and the valve plate, and the two ends of the closing spring abut against the valve cover and the buffer plate respectively.

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