Low-flow-resistance check valve in vacuum environment

Abstract

The utility model relates to a low-flow-resistance check valve in a vacuum environment, which comprises a check valve shell, the upper part of the inner cavity of the check valve shell is a first cavity, the lower part of the inner cavity of the check valve shell is a second cavity, and a sealing cavity is arranged between the first cavity and the second cavity; a reinforcing sealing plate is fixedly connected to the upper end of the check plate, a first sealing valve plate and a second sealing valve plate are fixedly connected to the outer side of the upper end of the check plate and the outer side of the reinforcing sealing plate respectively, and a limiting rod is movably inserted in the middle of the check plate in a penetrating mode. The upper end of the limiting rod is fixedly connected to the inner side wall of the first cavity through a support. And the non-return plate moves upwards and is inserted into the sealing cavity so as to seal the sealing cavity. According to the structure provided by the embodiment of the invention, the stable limiting rod and the limiting sliding cavity are matched for use, so that the vertical displacement of the non-return plate is more stable, and the limiting rod can limit the non-return plate, so that the vertical displacement of the non-return plate is more stable.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of check valves, in particular to a low-flow-resistance check valve under a vacuum environment. BACKGROUND

[0002] The check valve refers to a valve with a circular valve clack which can block the backflow of medium by its own weight and medium pressure. The check valve belongs to the automatic valve type and is also called a non-return valve, a one-way valve, a backflow valve or an isolation valve. The valve clack can move in the lifting type and the swing type. The lifting type check valve is similar to the stop valve in structure, and only lacks a valve rod for driving the valve clack. The medium flows from the inlet end, and the swing type check valve has a valve clack which is obliquely arranged and can rotate around the shaft, and the working principle is similar to that of the lifting type check valve. The check valve is often used as a bottom valve of a water pumping device to prevent the backflow of water. The check valve is combined with the stop valve to play a safety isolation role.

[0003] However, the displacement of the check plate is unstable when the ordinary check valve is used, and the sealing degree cannot meet the requirements after long-time use. Therefore, the application provides a low-flow-resistance check valve under a vacuum environment. CONTENT OF THE INVENTION

[0004] The application provides a low-flow-resistance check valve under a vacuum environment to solve the above problems.

[0005] The application provides a low-flow-resistance check valve under a vacuum environment, which comprises:

[0006] The check valve shell has a first cavity in the upper part of the inner cavity and a second cavity in the lower part of the inner cavity, and a sealing cavity is arranged between the first cavity and the second cavity;

[0007] The check plate is fixedly connected with a reinforced sealing plate at the upper end, and the outer side of the upper end of the check plate and the outer side of the reinforced sealing plate are fixedly connected with a first sealing valve piece and a second sealing valve piece respectively, a limiting rod is inserted into the middle part of the check plate in a movable mode, and the upper end of the limiting rod is fixedly connected to the inner side wall of the first cavity through a support;

[0008] The check plate is inserted into the inside of the sealing cavity in an upward displacement mode to seal the sealing cavity.

[0009] Preferably, the lower end of the limiting rod is fixedly connected with a limiting disc, and a spring is sleeved between the limiting disc and the check plate on the outer side of the limiting rod.

[0010] Preferably, the upper end of the check plate is fixedly connected with a stable limiting rod in a symmetrical mode on both sides, and the upper part of the stable limiting rod is inserted into the inside of the limiting sliding cavity of the check valve shell in a movable mode.

[0011] Preferably, the inner side of the sealing cavity is frustoconical, and the inner wall of the sealing cavity is smooth.

[0012] Preferably, the reinforcing sealing plate is frustoconical.

[0013] Preferably, the second cavity is cylindrical, and the diameter of the second cavity is greater than the diameter of the inner cavity of the lowermost end of the sealing cavity.

[0014] Preferably, the first sealing valve plate and the second sealing valve plate are both PTFE valve plates.

[0015] Preferably, the upper side and the lower side of the check valve shell are fixedly connected with connecting flanges.

[0016] The above technical solutions provided by the embodiments of the present application have the following advantages compared with the prior art:

[0017] The structure provided by the embodiments of the present application cooperates the limiting rod and the limiting sliding cavity to stabilize the up-and-down displacement of the check plate, and the limiting rod also limits the check plate to stabilize the up-and-down displacement of the check plate;

[0018] The cooperation of the sealing cavity and the reinforcing sealing plate can increase the sealing effect of the check plate, and also can increase the strength of the check plate to improve the impact resistance of the check plate. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present application and serve to explain the principles of the present application together with the specification.

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, those skilled in the art can obtain other drawings from these drawings without any creative effort.

[0021] Figure 1 It is a schematic view of the overall structure of the present application;

[0022] Figure 2 It is a sectional view of the present application;

[0023] Figure 3 It is a sectional view of the present application Figure 2 It is an enlarged view of A in the present application.

[0024] In the figure: 1, check valve housing; 2, flange; 3, first cavity; 4, second cavity; 5, sealing cavity; 6, limiting rod; 7, limiting disc; 8, spring; 9, check plate; 10, stable limiting rod; 11, limiting sliding cavity; 12, reinforced sealing plate; 13, first sealing valve piece; 14, second sealing valve piece. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0026] The various embodiments of the present application can exist in the form of a range. It should be understood that the description in the form of a range is merely for the convenience and brevity, and should not be understood as a hard limitation on the scope of the present application; therefore, it should be considered that the described range has specifically disclosed all possible sub-ranges and single values in the range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers in the described range, such as 1, 2, 3, 4, 5 and 6, which is applicable to any range. In addition, whenever a numerical range is indicated in the present application, it refers to any cited number (fraction or integer) in the indicated range. Unless otherwise specified, the various raw materials, reagents, instruments and equipment, etc. used in the present application can be purchased from the market or can be prepared by existing equipment.

[0027] In the present application, the orientation words such as "upper" and "lower" are specifically the directions of the drawing surface in the drawings unless otherwise stated. In addition, in the present application, the terms "include", "contain" and the like mean "include but not limited to". In the present application, the relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. In the present application, "and / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the cases of A alone, A and B together, and B alone. Wherein A and B can be singular or plural. In the present application, "at least one" means one or more, and "multiple" means two or more. "At least one", "at least one of the following" or the like means any combination of the items, including any combination of single or multiple items. For example, "at least one of a, b, or c", or "at least one of a, b, and c", can represent a, b, c, a-b, that is, a and b, a-c, b-c, or a-b-c, where a, b, and c can be single or multiple.

[0028] As shown in Figures 1-3 The embodiment of the present application provides a low-flow resistance check valve in a vacuum environment, which comprises:

[0029] A check valve housing 1, an inner cavity upper portion of the check valve housing 1 is a first cavity 3, an inner cavity lower portion of the check valve housing 1 is a second cavity 4, and a sealing cavity 5 is arranged between the first cavity 3 and the second cavity 4;

[0030] A check plate 9, a reinforcing sealing plate 12 is fixedly connected to an upper end of the check plate 9, a first sealing valve piece 13 and a second sealing valve piece 14 are fixedly connected to an outer side of the upper end of the check plate 9 and an outer side of the reinforcing sealing plate 12 respectively, and a limiting rod 6 is inserted into a middle portion of the check plate 9 in a movable manner, and an upper end of the limiting rod 6 is fixedly connected to an inner side wall of the first cavity 3 through a support;

[0031] The check plate 9 is inserted into the inside of the sealing cavity 5 in an upward displacement manner to seal the sealing cavity 5.

[0032] Specifically, the limiting rod 6 also limits the check plate 9, so that the upward and downward displacement of the check plate 9 is stable;

[0033] The check plate 9 is made of aluminum alloy pressing plate, and the quality is relatively light.

[0034] As shown in Figure 2 The lower end of the limiting rod 6 is fixedly connected to a limiting disc 7, and a spring 8 is sleeved between the limiting disc 7 and the check plate 9 on the outer side of the limiting rod 6.

[0035] Specifically, the spring 8 is always in a compressed state, and when the upper end of the check plate 9 is not subjected to force, the spring 8 will displace the check plate 9 upward.

[0036] As shown in Figure 2 and Figure 3 , the upper end of the check plate 9 is symmetrically and fixedly connected with a stable limiting rod 10, and the upper part of the stable limiting rod 10 is movably inserted into the limiting sliding cavity 11 symmetrically formed on the inner side of the check valve housing 1.

[0037] Specifically, the cooperation of the stable limiting rod 10 and the limiting sliding cavity 11 can make the upward and downward displacement of the check plate 9 more stable.

[0038] As shown in Figure 2 , the inner side of the sealing cavity 5 is in the shape of a circular truncated cone, and the inner wall of the sealing cavity 5 is smooth.

[0039] The reinforcing sealing plate 12 is in the shape of a circular truncated cone.

[0040] Specifically, the shape of the reinforcing sealing plate 12 is the same as that of the sealing cavity 5.

[0041] As shown in Figure 2 , the second cavity 4 is in the shape of a cylinder, and the diameter of the second cavity 4 is greater than that of the inner cavity at the lowermost end of the sealing cavity 5.

[0042] Specifically, when the check plate 9 is displaced upward, the upper end surface of the first sealing valve plate 13 can extrude the lower end side wall of the sealing cavity 5, so as to achieve the sealing effect.

[0043] As shown in Figure 3 , the first sealing valve plate 13 and the second sealing valve plate 14 are both PTFE valve plates.

[0044] Specifically, PTFE is a material widely used in sealing gaskets, and has good sealing performance.

[0045] As shown in Figure 1 , the upper and lower sides of the check valve housing 1 are fixedly connected with the connecting flanges 2.

[0046] Specifically, the connecting flanges 2 are used to connect pipelines.

[0047] Principle of use: when the device is in use, the check valve housing 1 is connected on the top and bottom, the upper end of the check valve housing 1 is connected to the side close to the vacuum environment, the lower end of the check valve housing 1 is connected to the external pipeline, the vacuum pump is opened, the gas flows through the check valve housing 1 from top to bottom, the check plate 9 is opened due to the gas flow, the gas passes through the check valve housing 1, the vacuum pump stops running, then the upper side of the check valve housing 1 is in a vacuum state, the lower side of the valve body is under normal pressure, so there is a pressure difference, which will make the check plate 9 displace upward and plug into the sealing cavity 5 to achieve a sealing state.

[0048] The above description is merely a specific implementation of the application and the skilled in the art can understand or implement the application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined in the application can be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, the application will not be limited to these embodiments shown in the application, but will conform to the widest scope consistent with the principles and novel features of the application.

Claims

1. A low flow resistance check valve in a vacuum environment, characterized by, Include: Check valve housing (1), the inner cavity upper part of the check valve housing (1) is the first cavity (3), the inner cavity lower part of the check valve housing (1) is the second cavity (4), sealing cavity (5) is arranged between the first cavity (3) and the second cavity (4); Check plate (9), the upper end of the check plate (9) is fixedly connected with the reinforced sealing plate (12), the outer side of the upper end of the check plate (9) and the outer side of the reinforced sealing plate (12) are fixedly connected with the first sealing valve piece (13) and the second sealing valve piece (14) respectively, the middle part of the check plate (9) is through the movable plug-in connection of the limiting rod (6), the upper end of the limiting rod (6) is fixedly connected with the inner side wall of the first cavity (3) through the support; The check plate (9) is displaced upwardly and plugged in the inside of the sealing cavity (5) to seal the sealing cavity (5).

2. A low flow resistance check valve for use in a vacuum environment according to claim 1, wherein: The lower end of the limiting rod (6) is fixedly connected with the limiting disc (7), and the outer side of the limiting rod (6) is sleeved with the spring (8) between the limiting disc (7) and the check plate (9).

3. A low flow resistance check valve for use in a vacuum environment according to claim 1, wherein: The upper end of the check plate (9) is fixedly connected with the stable limiting rod (10) on both sides, and the upper part of the stable limiting rod (10) is movably plugged in the inside of the limiting slide cavity (11) symmetrically arranged on the inner side of the check valve housing (1).

4. A low flow resistance check valve for use in a vacuum environment according to claim 1, wherein: The inner side of the sealing cavity (5) is circular truncated cone, and the inner side wall of the sealing cavity (5) is smooth.

5. A low flow resistance check valve for use in a vacuum environment according to claim 1, wherein: The reinforced sealing plate (12) is circular truncated cone.

6. A low flow resistance check valve for use in a vacuum environment according to claim 1, wherein: The second cavity (4) is cylindrical, and the diameter of the second cavity (4) is greater than the inner cavity diameter of the lowermost end of the sealing cavity (5).

7. A low flow resistance check valve for use in a vacuum environment according to claim 1, wherein: The first sealing valve piece (13) and the second sealing valve piece (14) are PTFE valve pieces.

8. A low flow resistance check valve for use in a vacuum environment according to claim 1, wherein: The upper and lower sides of the check valve housing (1) are fixedly connected with the connecting flange (2).

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