Novel pneumatic quick exhaust check valve

Abstract

The utility model relates to the technical field of valves, in particular to a novel pneumatic quick exhaust check valve. The upper cover is fixed to the top of the valve body, the hanging ring is fixed to the top of the upper cover, the upper cover is fixed to the valve body through a bolt and a first nut, an opening and closing mechanism is assembled on the inner side of the valve body, the opening and closing mechanism is used for opening and closing the valve body, and the opening and closing mechanism comprises a swing arm, a second nut, a valve clack, a first air cylinder and a valve rod. A valve rod is fixed to the top of one side in the valve body, and a swing arm is rotationally connected to the outer side of the valve rod. Through the structural design of the opening and closing mechanism and the adjusting mechanism, the valve body can be opened and closed conveniently, meanwhile, the position of the limiting head can be adjusted, the opening and closing amplitude of the valve clack can be controlled, and the problem that in the prior art, under the condition that flow or pressure needs to be adjusted rapidly, the valve clack cannot be opened or closed rapidly is solved. And a fixed limiting device can become a bottleneck, and the flexibility of the device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a novel pneumatic fast air extraction check valve. Background Art

[0002] In a thermal power plant, the steam turbine generator is the heart of the power plant. The exhaust check valve is a supporting product for steam turbine generator sets. It is a special fast-closing valve to protect steam turbine generator sets. Its function is to prevent the internal pressure of the steam turbine from suddenly decreasing when the steam turbine set is suddenly unloaded, and the steam in the extraction pipe and various heaters from flowing back into the steam turbine, causing the turbine blades rotating at a high speed of more than 3,000 revolutions per minute to suddenly reverse, causing the turbine blades to be broken and the steam turbine generator to be damaged. It also prevents the heater system pipeline from leaking and causing water to enter the turbine from the extraction pipeline and cause water hammer accidents. It is mainly used for emergency check valves and power plant steam turbine piping systems. In the event of a sudden loss of pressure in the steam turbine, it can be closed within 0.5 seconds to prevent steam and condensate from flowing back in the piping system and causing damage to the steam turbine.

[0003] For example, a vacuum check valve with a publication (announcement) number of CN216279572U includes a valve body, a valve seat, a valve disc, a valve stem, a valve cover, a control mechanism, a rotating arm, and a limiting device. The valve seat sealing surface has an angle of 60° with the horizontal plane. The valve stem is fixedly mounted on the valve body. The valve disc is movably mounted on the valve stem through a rotating arm. When the valve disc is fully opened, it contacts the limiting device to limit the valve disc. The control mechanism is fixed on the valve cover, and the control rod of the control mechanism is connected to the rotating arm.

[0004] In summary, it can be seen that the following technical problems exist in the prior art: during use, although the above-mentioned prior art can realize the opening and closing of the valve body, when the valve disc is opened and closed, the position of the limit device is fixed, making it difficult to control the opening and closing size of the valve disc. When the flow or pressure needs to be adjusted quickly, the fixed limit device may become a bottleneck. There is room for improvement. For this reason, we propose a new pneumatic quick-extraction check valve. Utility Model Content

[0005] The purpose of the utility model is to provide a novel pneumatic quick-extraction check valve to solve the problems raised in the above-mentioned background technology.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A novel pneumatic quick-extraction check valve comprises a valve body, and an upper cover fixed on the top of the valve body, a lifting ring fixed on the top of the upper cover, and the upper cover is fixed to the valve body by bolts and a first nut. An opening and closing mechanism is assembled on the inner side of the valve body, and the opening and closing mechanism is used to open and close the valve body. The opening and closing mechanism comprises a swing arm, a second nut, a valve disc, a first cylinder and a valve stem. A valve stem is fixed on the top of one side of the inner part of the valve body, and a swing arm is rotatably connected to the outer side of the valve stem. A valve disc is fixed to one end of the swing arm by a second nut. A guide port corresponding to the position of the valve disc is opened at one end of the inner side of the valve body, and the guide port is tightly fitted with the valve disc. A first cylinder is fixed on the top of the upper cover, and an output end of the first cylinder is slidably connected to the top of the swing arm.

[0008] Preferably, a stop pad is provided between the swing arm and the valve disc, and the stop pad fits tightly with the swing arm and the valve disc.

[0009] Preferably, a sealing gasket is provided between the upper cover and the valve body, and the sealing gasket is tightly fitted to the upper cover and the valve body.

[0010] Preferably, a limiting head is mounted on the inner side of the valve body and on a side away from the swing arm.

[0011] Preferably, an adjusting mechanism is installed between the limit head and the valve body, and the adjusting mechanism is used to limit the opening and closing range of the swing arm.

[0012] Preferably, the adjusting mechanism includes a second cylinder, a connecting arm, a connecting seat, a transmission arm, a sleeve rod and a limit clamp. The second cylinder is fixed to the outside of the valve body and close to the upper cover. The output end of the second cylinder is rotatably connected to the connecting arm and the limit clamp. The connecting arm is rotatably connected to the limit clamp. One end of the connecting arm is rotatably connected to the connecting seat, and the connecting seat is fixed to the inner side of the valve body. One end of the limit clamp is rotatably connected to the transmission arm, and one end of the transmission arm is fixed with a sleeve rod by a screw, and the sleeve rod is fixed to the limit head.

[0013] Preferably, a matching concave surface is provided on the top of the connecting seat, and the matching concave surface is gap-matched with the limiting clamp.

[0014] It can be seen without a doubt that the above-mentioned technical solution of the present application can definitely solve the technical problem to be solved by the present application.

[0015] At the same time, through the above technical solutions, the utility model has at least the following beneficial effects:

[0016] The utility model adopts the structural design of the opening and closing mechanism and the adjusting mechanism, so that the device is easy to open and close the valve body, and can adjust the position of the limit head at the same time, and can control the opening and closing amplitude of the valve disc, thereby solving the problem in the prior art that the fixed limit device will become a bottleneck when the flow or pressure needs to be adjusted quickly, thereby improving the flexibility of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the cutaway structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the connection structure between the valve body and the upper cover of the utility model;

[0020] Figure 3 It is a schematic diagram of the cutaway structure of the valve body of the utility model;

[0021] Figure 4 It is a schematic diagram of the connection structure of the transmission arm and the sleeve rod of the utility model;

[0022] Figure 5 It is a schematic diagram of the connection structure of the connection seat and the limit clamp of the utility model.

[0023] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0024] In the figure: 1. lifting ring; 2. upper cover; 3. sealing gasket; 4. bolt; 5. first nut; 6. swing arm; 7. second nut; 8. stop gasket; 9. valve disc; 10. valve body; 11. first cylinder; 12. limit head; 13. second cylinder; 14. connecting arm; 15. connecting seat; 16. transmission arm; 17. sleeve rod; 18. limit clamp; 19. matching concave surface; 20. valve stem. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0026] Example 1

[0027] Reference Figure 1-3A novel pneumatic quick-extraction check valve comprises a valve body 10, and an upper cover 2 fixed on the top of the valve body 10, a lifting ring 1 is fixed on the top of the upper cover 2, the upper cover 2 is fixed to the valve body 10 by bolts 4 and a first nut 5, an opening and closing mechanism is assembled on the inner side of the valve body 10, and the opening and closing mechanism is used to open and close the valve body 10, and the opening and closing mechanism comprises a swing arm 6, a second nut 7, a valve disc 9, a first cylinder 11 and a valve stem 20, a valve stem 20 is fixed on the top of one side of the inner side of the valve body 10, and a swing arm is rotatably connected to the outer side of the valve stem 20 6, a valve disc 9 is fixed to one end of the swing arm 6 through a second nut 7, a guide port corresponding to the position of the valve disc 9 is opened at one end of the inner side of the valve body 10, the guide port is tightly fitted with the valve disc 9, and a first cylinder 11 is fixed to the top of the upper cover 2, and the output end of the first cylinder 11 is slidably connected to the top of the swing arm 6. When the valve disc 9 needs to be closed, the first cylinder 11 is started, and the output end of the first cylinder 11 is slidably connected to the swing arm 6, so that the output end of the first cylinder 11 can push the swing arm 6 to rotate, thereby driving the valve disc 9 to close the guide port.

[0028] A backstop pad 8 is provided between the swing arm 6 and the valve flap 9. The backstop pad 8 is tightly fitted with the swing arm 6 and the valve flap 9. The provision of the backstop pad 8 can increase the connection firmness between the valve flap 9 and the swing arm 6.

[0029] A sealing gasket 3 is provided between the upper cover 2 and the valve body 10 . The sealing gasket 3 is tightly fitted to the upper cover 2 and the valve body 10 . The provision of the sealing gasket 3 can increase the sealing performance between the upper cover 2 and the valve body 10 .

[0030] A limit head 12 is installed on the inner side of the valve body 10 and on the side away from the swing arm 6 . The setting of the limit head 12 facilitates limiting the opening range of the valve flap 9 .

[0031] Example 2

[0032] Embodiment 1 is further optimized, specifically, as Figure 3-5 As shown, an adjusting mechanism is installed between the limit head 12 and the valve body 10 , and the adjusting mechanism is used to limit the opening and closing range of the swing arm 6 .

[0033] The regulating mechanism comprises a second cylinder 13, a connecting arm 14, a connecting seat 15, a transmission arm 16, a sleeve rod 17 and a limit clamp 18. The second cylinder 13 is fixed on the outer side of the valve body 10 and close to the upper cover 2. The output end of the second cylinder 13 is rotatably connected with the connecting arm 14 and the limit clamp 18. The connecting arm 14 is rotatably connected to the limit clamp 18. One end of the connecting arm 14 is rotatably connected with the connecting seat 15. The connecting seat 15 is fixed to the inner side of the valve body 10. One end of the limit clamp 18 is rotatably connected with the transmission arm 16. One end of the transmission arm 16 is fixed with a sleeve rod 17 by screws. The sleeve rod 17 is fixed to the limit head 12. When the second cylinder 13 is started, the output end of the second cylinder 13 pulls the connecting arm 14 and the limit clamp 18, so that the limit clamp 18 pushes the transmission arm 16 and the sleeve rod 17 to rotate, thereby realizing the position adjustment of the limit head 12, so that the limit position of the limit head 12 and the valve disc 9 changes.

[0034] A matching concave surface 19 is provided on the top of the connecting seat 15 , and the matching concave surface 19 is clearance-matched with the limiting clip 18 . When the limiting clip 18 rotates, the matching concave surface 19 prevents the connecting seat 15 from causing a limiting obstacle to the rotation of the limiting clip 18 .

[0035] From the above, we can know that:

[0036] The utility model aims at the following technical problems: the existing technology can realize the opening and closing of the valve body during use, but when the valve flap is opened and closed, the position of the limit device is fixed, making it difficult to control the opening and closing size of the valve flap. When the flow or pressure needs to be adjusted quickly, the fixed limit device may become a bottleneck, and there is room for improvement; the technical solutions of the above embodiments are adopted. At the same time, the implementation process of the above technical solutions is:

[0037] When it is necessary to adjust the position of the limit head 12, the second cylinder 13 is started, and the output end of the second cylinder 13 pushes the connecting arm 14 and the limit clamp 18, so that the connecting arm 14 rotates along the pin connected to the connecting seat 15, and at the same time, the limit clamp 18 pushes the transmission arm 16 and the sleeve rod 17 to rotate, so as to adjust the position of the limit head 12, so that the relative position of the limit head 12 and the valve disc 9 changes, and then when the valve disc 9 is opened, the opening amplitude of the valve disc 9 can be increased or decreased, so as to control the flow or pressure in the valve body 10.

[0038] Through the above configuration, the present application can certainly solve the above technical problems and achieve the following technical effects:

[0039] The utility model adopts the structural design of the opening and closing mechanism and the adjusting mechanism, so that the device can easily open and close the valve body 10, and can adjust the position of the limit head 12 at the same time, and can control the opening and closing amplitude of the valve flap 9, thereby solving the problem in the prior art that the fixed limit device will become a bottleneck when the flow or pressure needs to be adjusted quickly, thereby improving the flexibility of the device.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Obviously, the embodiments described above are only some embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.

Claims

1. A new type of pneumatic quick-extraction check valve, characterized in that: The invention comprises a valve body (10), and an upper cover (2) fixed on the top of the valve body (10), a lifting ring (1) fixed on the top of the upper cover (2), the upper cover (2) being fixed to the valve body (10) by means of a bolt (4) and a first nut (5), an opening and closing mechanism being arranged on the inner side of the valve body (10), the opening and closing mechanism being used for opening and closing the valve body (10), the opening and closing mechanism comprising a swing arm (6), a second nut (7), a valve flap (9), a first cylinder (11) and a valve stem (20), the valve A valve stem (20) is fixed to the top of one side of the inner part of the body (10), and a swing arm (6) is rotatably connected to the outer side of the valve stem (20), and a valve flap (9) is fixed to one end of the swing arm (6) via a second nut (7). A guide port corresponding to the position of the valve flap (9) is opened at one end of the inner side of the valve body (10), and the guide port is tightly fitted with the valve flap (9). A first cylinder (11) is fixed to the top of the upper cover (2), and the output end of the first cylinder (11) is slidably connected to the top of the swing arm (6).

2. A novel pneumatic quick-extraction check valve according to claim 1, characterized in that: A stop-retraction pad (8) is provided between the swing arm (6) and the valve flap (9), and the stop-retraction pad (8) is tightly fitted to the swing arm (6) and the valve flap (9).

3. A novel pneumatic quick-extraction check valve according to claim 1, characterized in that: A sealing gasket (3) is provided between the upper cover (2) and the valve body (10), and the sealing gasket (3) is tightly fitted to the upper cover (2) and the valve body (10).

4. A novel pneumatic quick-extraction check valve according to claim 1, characterized in that: A limiting head (12) is mounted on the inner side of the valve body (10) and on a side away from the swing arm (6).

5. A novel pneumatic quick-extraction check valve according to claim 4, characterized in that: An adjusting mechanism is installed between the limit head (12) and the valve body (10), and the adjusting mechanism is used to limit the opening and closing range of the swing arm (6).

6. A novel pneumatic quick-extraction check valve according to claim 5, characterized in that: The regulating mechanism comprises a second cylinder (13), a connecting arm (14), a connecting seat (15), a transmission arm (16), a sleeve rod (17) and a limit clamp (18); the second cylinder (13) is fixed on the outer side of the valve body (10) and close to the upper cover (2); the output end of the second cylinder (13) is rotatably connected to the connecting arm (14) and the limit clamp (18); the connecting arm (14) is rotatably connected to the limit clamp (18); one end of the connecting arm (14) is rotatably connected to the connecting seat (15); the connecting seat (15) is fixed to the inner side of the valve body (10); one end of the limit clamp (18) is rotatably connected to the transmission arm (16); one end of the transmission arm (16) is fixed to the sleeve rod (17) by screws; the sleeve rod (17) is fixed to the limit head (12).

7. A novel pneumatic quick-extraction check valve according to claim 6, characterized in that: A matching concave surface (19) is provided on the top of the connecting seat (15), and the matching concave surface (19) is clearance-matched with the limiting clamp (18).

Images