Swash plate type check valve with micro-resistance slow-closing damper

Abstract

The utility model discloses a swash plate type check valve with a micro-resistance slow-closing damper, which relates to the technical field of check valves, and comprises a left valve body, a right valve body and a butterfly plate main body, a damping column is arranged on the butterfly plate main body, a damper body is welded in the right valve body, a sliding spring seat is arranged in the damper body in a sliding manner, and the sliding spring seat is connected with the left valve body and the right valve body. A fixed spring seat is welded to the damper body, a spring is arranged between the sliding spring seat and the fixed spring seat, and the damping column is used for making contact with the sliding spring seat before the butterfly plate body is closed. And when the butterfly plate is continuously closed, the elastic force of the spring is overcome to push the sliding spring seat to slide, so that the slow closing of the butterfly plate main body is realized. The swash plate type check valve is used for solving the problems that a guide key falls off due to looseness of a limiting nut of a traditional swash plate type check valve, a heavy hammer slides out of a heavy hammer arm due to the fact that a heavy hammer fastening bolt falls off and is lost, and the defects caused by invalidation of the micro-resistance slow-closing function of the heavy hammer are caused.

Description

Technical Field

[0001] The utility model relates to the technical field of check valves, in particular to a tilting disc check valve with a micro-resistance slow-closing damper. Background Art

[0002] With the improvement of modern industrial development requirements and the advancement of fluid control technology, valves, as the "pipeline throat", play an indispensable role in social production and life. As an important component of the process equipment system, valves have the functions of connecting or cutting off fluid passages, controlling flow direction, throttling, checking, regulating flow and pressure, etc., and can well control the flow of various fluids such as air, water, various corrosive media, mud, liquid metal and radioactive substances. At the same time, its wide application, huge quantity and high value creation make it an important fluid machinery for fluid pipelines used in the fields of electricity, petroleum, petrochemicals, coal chemical industry, aerospace, transportation, urban construction, agriculture and people's lives.

[0003] A check valve is a valve that does not require manual operation and can be automatically controlled by the flow of media. Its working characteristics are large load changes, fast switching rates, and flexible movements, which are higher than common mechanical movements. In practical applications, check valves are protective mechanical equipment for pumps and compressors to prevent the backflow of media. Most nuclear power plant pump equipment outlets are equipped with check valves. Due to their specific operating environment and working media, compared with conventional industry check valves, the reliability level of check valves has a particularly prominent impact on system safety performance and maintenance costs. Therefore, a reliable non-return function is a key design element for the check valve to effectively protect the internal components of the mechanical equipment before the valve from damage and prevent unnecessary parking.

[0004] The inclined disc check valve is a type of swing check valve. It is a one-way valve whose disc rotates around a fixed axis. It is widely used in industrial production due to its simple structure, low pressure drop, good economy, reliable sealing, relatively convenient maintenance and repair, and wide application range. When the pump is stopped, the size of the check valve backflow speed directly determines the different valve closing impact speeds. The impact of the collision on the check valve cannot be ignored. It will not only affect the sealing life of the check valve, but even directly make it lose its strength. In addition, the rapid closing of the inclined disc check valve will cause hydraulic appreciation, resulting in water hammer in the pipeline, and in severe cases, it will cause the pipeline to rupture, affecting production and domestic water use.

[0005] At present, the inclined disc check valve is generally designed with a buffer device on the valve, which uses the force generated by the reverse flow of the medium in the pipeline to act on the surface of the valve disc, and the valve disc transmits the force to the heavy hammer connected to it to increase the movement resistance of the valve disc, thereby achieving the purpose of slowing down the movement speed of the valve disc to reduce the possibility of water hammer. Figure 1 and Figure 2The weight arm 18 is connected to the check valve rocker shaft 20 by a key 19 and fixed by a limit nut 21, and the weight 22 is connected to the weight arm 18 by a bolt 23.

[0006] The disadvantages of this structure are:

[0007] When the valve is opened and closed for a long time, the weight arm swings back and forth, and affected by the vibration of the pump, the limit nut is easy to loosen, causing the key to fall off, or because the valve is opened and closed frequently, the weight causes the weight arm to swing continuously. As time goes by, the connecting key of the weight arm wears out, the weight arm spins around the rocker shaft, and the weight no longer plays the role of slow closing of the check valve.

[0008] Under the action of medium pumping pressure, the valve disc is constantly opened and closed, and the connecting bolts between the weight and the weight arm become loose or even fall off or lost after long-term operation, eventually causing the weight to slide out of the weight arm, and the weight no longer plays the role of slow closing of the check valve. Utility Model Content

[0009] The utility model aims to provide a tilting disc check valve with a micro-resistance slow-closing damper, so as to solve the problems that the guide key falls off due to the loosening of the limit nut of the traditional tilting disc check valve, and the weight hammer slips out of the weight hammer arm due to the falling off and loss of the weight hammer fastening bolt, resulting in the failure of the micro-resistance slow-closing function of the weight hammer.

[0010] To achieve the above purpose, the utility model provides the following solutions:

[0011] The utility model provides a tilting disc check valve with a micro-resistance slow-closing damper, comprising a left valve body, a right valve body and a butterfly plate body, wherein a damping column is arranged on the butterfly plate body, a damper body is welded in the right valve body, a sliding spring seat is slidably arranged in the damper body, a fixed spring seat is welded on the damper body, a spring is arranged between the sliding spring seat and the fixed spring seat, the damping column is used for contacting with the sliding spring seat before the butterfly plate body is closed, and for overcoming the elastic force of the spring to push the sliding spring seat to slide when continuing to close so as to realize the slow closing of the butterfly plate body.

[0012] Preferably, a limit pin is fixedly provided on the side of the butterfly plate body facing away from the damping column, and the limit pin is used to abut against the limit surface in the left valve body when the butterfly plate body is opened to prevent the butterfly plate body from over-opening.

[0013] Preferably, a slideway is provided in the damper body, the sliding spring seat is slidably arranged in the slideway, a limiting step is provided at one end of the slideway, and a limiting boss corresponding to the limiting step is provided on the sliding spring seat, and the limiting step and the limiting boss form a limit with each other after contacting each other to prevent the sliding spring seat from sliding out of the slideway.

[0014] Preferably, a receiving groove is provided in the sliding spring seat, a limiting groove is provided on the fixed spring seat, and two ends of the spring are respectively arranged in the receiving groove and the limiting groove.

[0015] Preferably, when the butterfly plate body is 20° away from the final closed position, the damping column begins to contact the sliding spring seat.

[0016] Compared with the prior art, the utility model has achieved the following technical effects:

[0017] (1) Compared with the traditional tilting disc check valve with a heavy hammer, the built-in damper reduces one external connection of the valve, eliminates one potential leakage channel of the valve, and improves the sealing reliability of the valve.

[0018] (2) Compared with the traditional tilting disc check valve with a weight, the damper body and the valve body are connected by welding, which reduces the number of connecting parts and improves the reliability and sealing of the valve.

[0019] (3) Compared with the traditional tilting disc check valve with a heavy hammer, the built-in damper relies on the elastic force of the spring to achieve the valve's micro-resistance slow closing function, and its slow closing function is more reliable.

[0020] (4) Compared with the traditional tilting disc check valve with a weight, the built-in damper body and the fixed spring seat are connected by welding, eliminating the risk of thread loosening or bolt loosening causing the damping function to fail. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only 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.

[0022] Figure 1 It is a structural schematic diagram of an existing inclined disc check valve with a weight;

[0023] Figure 2 for Figure 1 Middle AA section;

[0024] Figure 3 A schematic diagram of the structure of a tilted disc check valve with a micro-resistance slow-closing damper provided by the utility model;

[0025] Figure 4 It is a structural schematic diagram of the damper assembly in the utility model.

[0026] In the figure: 1-left valve body, 2-right valve body, 3-butterfly plate body, 4-damping column, 5-damper body, 6-sliding spring seat, 7-fixed spring seat, 8-spring, 9-limiting pin, 10-limiting surface, 11-slide, 12-limiting step, 13-limiting boss, 14-accommodating groove, 15-limiting groove, 16-weld I, 17-weld II, 18-weight arm, 19-key, 20-rocker shaft, 21-limiting nut, 22-weight, 23-bolt. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] The utility model aims to provide a tilting disc check valve with a micro-resistance slow-closing damper, so as to solve the problems that the guide key falls off due to the loosening of the limit nut of the traditional tilting disc check valve, and the weight hammer slips out of the weight hammer arm due to the falling off and loss of the weight hammer fastening bolt, resulting in the failure of the micro-resistance slow-closing function of the weight hammer.

[0029] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] like Figure 3-Figure 4 As shown, this embodiment provides a tilting disc check valve with a micro-resistance slow-closing damper, including a left valve body 1, a right valve body 2 and a butterfly plate body 3, a damping column 4 is provided on the butterfly plate body 3, a damper body 5 is welded in the right valve body 2, a sliding spring seat 6 is slidably provided in the damper body 5, a fixed spring seat 7 is welded on the damper body 5, a spring 8 is provided between the sliding spring seat 6 and the fixed spring seat 7, and the damping column 4 is used to contact the sliding spring seat 6 before the butterfly plate body 3 is closed, and to overcome the elastic force of the spring 8 to push the sliding spring seat 6 to slide when continuing to close to achieve the slow closing of the butterfly plate body 3. In this embodiment, when the butterfly plate body 3 is 20° away from the final closed position, the damping column 4 begins to contact the sliding spring seat 6. The medium pressure difference overcomes the spring force of the spring 8 and begins to slowly close the butterfly plate body 3, realizing the micro-resistance slow-closing function, thereby preventing the water hammer effect when the check valve is quickly closed.

[0031] In this embodiment, a limit pin 9 is fixedly provided on the side of the butterfly plate body 3 facing away from the damping column 4. When the butterfly plate body 3 is opened under the action of the medium pressure difference, the limit surface of the limit pin 9 abuts against the limit surface 10 of the left valve body 1, and the butterfly plate body 3 reaches the fully opened position, preventing the butterfly plate body 3 from being over-opened.

[0032] In this embodiment, a slideway 11 is provided in the damper body 5, and the sliding spring seat 6 is slidably arranged in the slideway 11. A limiting step 12 is provided at one end of the slideway 11, and a limiting boss 13 corresponding to the limiting step 12 is provided on the sliding spring seat 6. The limiting step 12 and the limiting boss 13 form a limit with each other after contacting each other to prevent the sliding spring seat 6 from sliding out of the slideway 11. The slideway 11 provides a working force space for the spring 8, which is convenient for the compression and extension of the spring 8, and realizes the function of overcoming the spring force to slow down the closing when the valve is closed, and provides the minimum opening pressure function when the valve is opened. And the cooperation between the limiting step 12 and the limiting boss 13 can prevent the sliding spring seat 6 from sliding out of the slideway 11 under the action of the elastic force of the spring 8.

[0033] After the sliding spring seat 6 and the spring 8 are sequentially installed in the slideway 11 of the damper body 5, the fixed spring seat 7 is welded to the damper body 5 using a special fixture to form a weld seam I16, thereby forming a damper assembly, which is used to prevent the spring 8 inside the damper body 5 from falling off and becoming inoperative due to loose threads caused by connections such as threads or bolts. The damper body 5 and the right valve body 2 are connected by welding to form a weld seam II17, which is used to reduce the number of connectors and improve the valve sealing reliability.

[0034] In this embodiment, a receiving groove 14 is provided in the sliding spring seat 6, a limiting groove 15 is provided on the fixed spring seat 7, and both ends of the spring 8 are respectively arranged in the receiving groove 14 and the limiting groove 15 to ensure the stability of the spring 8.

[0035] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A tilting disc check valve with a micro-resistance slow-closing damper, comprising a left valve body, a right valve body and a butterfly plate body, characterized in that: A damping column is provided on the butterfly plate body, a damper body is welded in the right valve body, a sliding spring seat is slidably provided in the damper body, a fixed spring seat is welded on the damper body, a spring is provided between the sliding spring seat and the fixed spring seat, the damping column is used to contact with the sliding spring seat before the butterfly plate body is closed, and overcome the spring elastic force to push the sliding spring seat to slide when continuing to close to achieve slow closing of the butterfly plate body.

2. The tilting disc check valve with a micro-resistance slow-closing damper according to claim 1 is characterized in that: A limit pin is fixedly provided on the side of the butterfly plate body facing away from the damping column. The limit pin is used to abut against the limit surface in the left valve body when the butterfly plate body is opened to prevent the butterfly plate body from over-opening.

3. The tilting disc check valve with a micro-resistance slow-closing damper according to claim 1 is characterized in that: A slideway is provided in the damper body, the sliding spring seat is slidably arranged in the slideway, a limiting step is provided at one end of the slideway, and a limiting boss corresponding to the limiting step is provided on the sliding spring seat. After the limiting step and the limiting boss contact each other, they form a limit with each other to prevent the sliding spring seat from sliding out of the slideway.

4. The tilting disc check valve with a micro-resistance slow-closing damper according to claim 1 is characterized in that: The sliding spring seat is provided with a receiving groove, the fixed spring seat is provided with a limiting groove, and the two ends of the spring are respectively arranged in the receiving groove and the limiting groove.

5. The tilting disc check valve with a micro-resistance slow-closing damper according to claim 1 is characterized in that: When the butterfly plate body is 20° away from the final closed position, the damping column begins to contact the sliding spring seat.

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