Improved pneumatic control valve

Abstract

The utility model discloses an improved pneumatic control valve which is characterized in that a valve cavity is arranged inside a valve body, a valve core is arranged inside the valve cavity, a valve rod and a pneumatic actuator are arranged on a valve head support, and the pneumatic actuator drives the valve core to open and close through the valve rod. The valve cavity comprises an arc-shaped water inlet cavity, an arc-shaped water outlet cavity and a communicating cavity communicating the arc-shaped water inlet cavity and the arc-shaped water outlet cavity, the position of the arc-shaped water inlet cavity is lower than that of the arc-shaped water outlet cavity, the water inlet channel is communicated with the arc-shaped water inlet cavity, the water outlet channel is communicated with the arc-shaped water outlet cavity, and an anti-scouring component is arranged in the water inlet channel. The anti-scour component comprises a rotating body and buffer blades arranged on the rotating body. According to the improved pneumatic control valve, flowing liquid can be buffered through the structure formed by the arc-shaped water inlet cavity and the arc-shaped water outlet cavity, washing is reduced, meanwhile, the anti-washing component can further buffer the flowing liquid, and the anti-washing effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pneumatic control valve technical field, in particular to improved pneumatic control valve. BACKGROUND

[0002] Pneumatic control valve is with compressed gas as power source, with cylinder as actuator, and with the help of valve positioner, converter, solenoid valve, position valve, gas tank, gas filter and other accessories to drive valve, realize on-off or proportional control, receive the control signal of industrial automation control system to complete the adjustment of pipeline medium: flow, pressure, temperature, liquid level and other various process parameters. Pneumatic control valve is one of the industrial process control instruments widely used in petroleum, chemical industry, electric power, metallurgy and other industrial enterprises, and can be basically divided into straight stroke and angular stroke according to the valve action mode. The existing pneumatic control valve is seriously scoured by the liquid flowing through the valve body in actual use, which often causes damage to the valve core inside the valve body. SUMMARY

[0003] The utility model aims at providing an improved pneumatic control valve to solve the above-mentioned deficiencies in the prior art.

[0004] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0005] An improved pneumatic control valve, comprising a valve body and a valve head support arranged on the valve body, a valve cavity is arranged inside the valve body, a valve core is arranged inside the valve cavity, a valve cover is sealingly and fixedly arranged on the valve body, the valve head support is fixedly connected to the valve cover, a valve rod and a pneumatic actuator are arranged on the valve head support, the pneumatic actuator is installed on the top of the valve head support, the upper end of the valve rod is coaxially connected with the action end of the pneumatic actuator through the valve cover and the valve head support, and the pneumatic actuator drives the valve core to open and close through the valve rod.

[0006] Opposite sides of the valve body are respectively provided with an inlet channel and an outlet channel, the valve cavity comprises an arc-shaped inlet cavity, an arc-shaped outlet cavity and a communication cavity communicating the arc-shaped inlet cavity and the arc-shaped outlet cavity, the position of the arc-shaped inlet cavity is lower than that of the arc-shaped outlet cavity, the inlet channel is in communication with the arc-shaped inlet cavity, the outlet channel is in communication with the arc-shaped outlet cavity, an anti-scouring member is arranged inside the inlet channel, and the anti-scouring member comprises a rotating body and a buffer blade arranged on the rotating body.

[0007] The improved pneumatic control valve, the pneumatic actuator comprises a pneumatic cavity arranged on the top of the valve head support and a pneumatic diaphragm arranged in the pneumatic cavity, and the pneumatic diaphragm divides the pneumatic cavity into an upper inlet cavity and a lower driving cavity.

[0008] The improved pneumatic regulating valve has a movement channel formed in the valve head support for movement of the valve rod, and the movement channel comprises an upper movement section, an intermediate section and a lower movement section.

[0009] The improved pneumatic regulating valve has an upper movement seat and a lower movement seat arranged on the valve rod, the upper movement seat is slidably connected in the upper movement section, and the lower movement seat is slidably connected in the lower movement section.

[0010] The improved pneumatic regulating valve further comprises a first spring member and a second spring member sleeved on the valve rod, the first spring member is located in the upper movement section, and the second spring member is located in the lower movement section.

[0011] The improved pneumatic regulating valve has a plurality of buffer blades, the plurality of buffer blades are sequentially and spacedly arranged along the circumference of the rotating body, and the buffer blades are arranged to block the flow direction of the liquid along the water inlet channel.

[0012] The improved pneumatic regulating valve has a plurality of flow holes arranged on the buffer blade, and the plurality of flow holes are sequentially and juxtaposedly arranged along the buffer blade.

[0013] The improved pneumatic regulating valve has a sliding seat arranged at each of opposite ends of the rotating body, and a sliding groove arranged at each of opposite sides of the water inlet channel, and the sliding seat is slidably connected in the sliding groove.

[0014] The improved pneumatic regulating valve further comprises a first buffer spring and a second buffer spring arranged oppositely, and the first buffer spring and the second buffer spring are arranged at opposite sides of the sliding seat, respectively.

[0015] In the technical scheme, the improved pneumatic regulating valve comprises a valve body and a valve head support arranged on the valve body, the valve body is internally provided with a valve cavity, the valve cavity is internally provided with a valve core, the valve head support is fixedly connected to a valve cover, a pneumatic actuator is mounted on the top of the valve head support, the valve cavity comprises an arc-shaped water inlet cavity, an arc-shaped water outlet cavity and a communication cavity communicating the arc-shaped water inlet cavity and the arc-shaped water outlet cavity, the position of the arc-shaped water inlet cavity is lower than that of the arc-shaped water outlet cavity, a water inlet channel is connected to the arc-shaped water inlet cavity, a water outlet channel is connected to the arc-shaped water outlet cavity, a scouring-preventing member is arranged in the water inlet channel, the scouring-preventing member comprises a rotating body and a buffer blade arranged on the rotating body, and thus the structure formed by the arc-shaped water inlet cavity and the arc-shaped water outlet cavity can buffer the liquid flowing therethrough, reduce scouring, and the scouring-preventing member can further buffer the liquid flowing therethrough, and improve the scouring-preventing effect. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0017] Fig. 1 The structural schematic diagram of the improved pneumatic regulating valve provided by the embodiment of the present application is shown in the figure.

[0018] Fig. 2 The internal structural schematic diagram of the improved pneumatic regulating valve provided by the embodiment of the present application is shown in the figure.

[0019] Fig. 3 The installation schematic diagram of the anti-scouring member provided by the embodiment of the present application is shown in the figure.

[0020] Explanation of reference signs:

[0021] 1, valve body; 11, valve cavity; 111, arc-shaped water inlet cavity; 112, arc-shaped water outlet cavity; 113, communication cavity; 12, valve core; 13, valve cover; 14, water inlet passage; 15, water outlet passage; 2, valve head support; 21, pneumatic actuator; 22, pneumatic diaphragm; 23, upper air inlet cavity; 24, movement passage; 241, upper movement section; 242, middle section; 243, lower movement section; 25, valve rod; 251, upper movement seat; 252, lower movement seat; 26, first spring member; 27, second spring member; 3, anti-scouring member; 31, rotating body; 32, buffer blade; 33, sliding seat; 34, sliding groove; 35, first buffer spring; 36, second buffer spring. DETAILED DESCRIPTION

[0022] In order to make those skilled in the art better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings.

[0023] As Figs. 1-3The utility model provides an improved pneumatic regulating valve, including valve body 1 and the valve head support 2 of setting on valve body 1, be provided with valve cavity 11 in valve body 1, be provided with valve core 12 in valve cavity 11, the sealing solid of valve body 1 is equipped with valve bonnet 13, valve bonnet 13 is fixedly connected with valve head support 2, be provided with valve stem 25 and pneumatic actuator 21 on valve head support 2, pneumatic actuator 21 is installed at the top of valve head support 2, the upper end of valve stem 25 coaxially passes through valve bonnet 13 and valve head support 2 and is connected with the action end of pneumatic actuator 21 through connecting block, pneumatic actuator 21 drives valve core 12 switch action through valve stem 25, the opposite sides of valve body 1 are provided with water inlet channel 14 and water outlet channel 15 respectively, water inlet channel 14 and water outlet channel 15 are provided at the opposite sides of valve cavity 11 and are all connected with valve cavity 11, valve cavity 11 includes arc water inlet chamber 111, arc water outlet chamber 112 and the communicating chamber 113 of the communication arc water inlet chamber 111 and arc water outlet chamber 112, the position of arc water inlet chamber 111 is lower than the position of arc water outlet chamber 112, water inlet channel 14 is provided with anti-scouring member 3 inside, and anti-scouring member 3 includes rotator 31 and the buffer vane 32 of setting on rotator 31.

[0024] Specifically, the pneumatic regulating valve comprises a valve body 1 and a valve head support 2, the valve body 1 is sealed and provided with a valve cover 13, the valve head support 2 is fixedly installed on the valve cover 13, the top of the valve head support 2 is provided with a pneumatic actuator 21, the pneumatic actuator 21 is a pneumatic diaphragm 22 actuator, the inside of the valve head support 2 is provided with a valve stem 25, the pneumatic actuator 21 is provided with a pneumatic diaphragm 22, the top of the valve stem 25 is connected with the pneumatic diaphragm 22, a spring structure is sleeved on the valve stem 25, an air inlet and an air outlet are arranged in an air inlet chamber formed above the pneumatic diaphragm 22, the pneumatic actuator 21 is a normally closed regulating valve, and the structure and principle of the normally closed regulating valve are not described in detail.

[0025] In the embodiment, the valve body 1 is internally provided with a valve cavity 11, the valve cavity 11 is internally provided with a valve core 12, the valve core 12 is connected with a valve seat, the valve seat is connected at the bottom of the valve rod 25, the valve cavity 11 comprises an arc-shaped water inlet cavity 111, a communication cavity 113 and an arc-shaped water outlet cavity 112 connected in sequence, the position of the arc-shaped water inlet cavity 111 is lower than that of the arc-shaped water outlet cavity 112, the part connected between the arc-shaped water inlet cavity 111 and the communication cavity 113 is downwardly bent, the part connected between the arc-shaped water outlet cavity 112 and the communication cavity 113 is upwardly bent, the communication cavity 113 comprises an upper cavity, a cylindrical section and a lower cavity, the size of the cylindrical section is smaller than that of the upper cavity and the lower cavity, the upper cavity is communicated with the arc-shaped water outlet cavity 112, the lower cavity is communicated with the arc-shaped water inlet cavity 111, the cylindrical section is correspondingly arranged with the valve core 12, when the valve core 12 is driven by the valve rod 25 to be embedded into the cylindrical section, the valve core 12 seals the communication cavity 113, so that the arc-shaped water inlet cavity 111 and the arc-shaped water outlet cavity 112 are separated, when the valve core 12 moves to the upper cavity, the communication cavity 113 is opened, and the arc-shaped water inlet cavity 111 and the arc-shaped water outlet cavity 112 are communicated.

[0026] In the embodiment, the valve body 1 is internally provided with a valve cavity 11, the valve cavity 11 is internally provided with a valve core 12, the valve core 12 is connected with a valve seat, the valve seat is connected at the bottom of the valve rod 25, the valve cavity 11 comprises an arc-shaped water inlet cavity 111, a communication cavity 113 and an arc-shaped water outlet cavity 112 connected in sequence, the position of the arc-shaped water inlet cavity 111 is lower than that of the arc-shaped water outlet cavity 112, the part connected between the arc-shaped water inlet cavity 111 and the communication cavity 113 is downwardly bent, the part connected between the arc-shaped water outlet cavity 112 and the communication cavity 113 is upwardly bent, the communication cavity 113 comprises an upper cavity, a cylindrical section and a lower cavity, the size of the cylindrical section is smaller than that of the upper cavity and the lower cavity, the upper cavity is communicated with the arc-shaped water outlet cavity 112, the lower cavity is communicated with the arc-shaped water inlet cavity 111, the cylindrical section is correspondingly arranged with the valve core 12, when the valve core 12 is driven by the valve rod 25 to be embedded into the cylindrical section, the valve core 12 seals the communication cavity 113, so that the arc-shaped water inlet cavity 111 and the arc-shaped water outlet cavity 112 are separated, when the valve core 12 moves to the upper cavity, the communication cavity 113 is opened, and the arc-shaped water inlet cavity 111 and the arc-shaped water outlet cavity 112 are communicated.

[0027] The improved pneumatic regulating valve provided by the utility model, including valve body 1 and valve head support 2 arranged on valve body 1, valve body 1 is internally provided with valve cavity 11, valve cavity 11 is internally provided with valve core 12, valve cover 13 is fixedly connected with valve head support 2, pneumatic actuator 21 is installed at the top of valve head support 2, valve cavity 11 includes arc water inlet cavity 111, arc water outlet cavity 112 and communication cavity 113 in communication with arc water inlet cavity 111 and arc water outlet cavity 112, the position of arc water inlet cavity 111 is lower than the position of arc water outlet cavity 112, arc water inlet cavity 111 is connected with water inlet channel 14, arc water outlet cavity 112 is connected with water outlet channel 15, water inlet channel 14 is internally provided with anti-scouring member 3, anti-scouring member 3 includes rotating body 31 and buffer blade 32 arranged on rotating body 31, so that the structure formed by arc water inlet cavity 111 and arc water outlet cavity 112 can buffer the liquid flowing through, reduce scouring, and anti-scouring member 3 can further buffer the liquid flowing through, improving the anti-scouring effect.

[0028] In the embodiment, preferably, the pneumatic actuator 21 includes a pneumatic cavity arranged at the top of the valve head support 2 and a pneumatic diaphragm 22 arranged in the pneumatic cavity, the pneumatic diaphragm 22 divides the pneumatic cavity into an upper air inlet cavity 23 and a lower driving cavity, the valve head support 2 is internally formed with a movement channel 24 for movement of a valve rod 25, the movement channel 24 includes an upper movement section 241, an intermediate section 242 and a lower movement section 243, the valve rod 25 is provided with an upper movement seat 251 and a lower movement seat 252, the upper movement seat 251 is slidably connected in the upper movement section 241, and the lower movement seat 252 is slidably connected in the lower movement section 243; thus when compressed air enters the upper air inlet cavity 23, the valve rod 25 is pushed to move downward, thereby driving the valve core 12 to move, the movement of the valve core 12 changes the flow area of the valve cavity 11, so as to adjust the flow of the medium. When the valve core 12 completely opens the valve cavity 11, the valve cavity 11 is unobstructed; when the valve core 12 gradually closes the valve cavity 11, the flow area of the valve cavity 11 decreases, and the flow also decreases. In the process of upward and downward movement of the valve rod 25 along the movement channel 24, the upper movement seat 251 moves in the upper movement section 241, and the lower movement seat 252 moves in the lower movement section 243. It should be noted that the pneumatic regulating valve can also include a positioner, a feedback device and the like, which will not be described herein.

[0029] In the embodiment, preferably, the first spring member 26 and the second spring member 27 are sleeved on the valve rod 25, the first spring member 26 is located in the upper movement section 241, the upper end of the first spring member 26 is connected with the top wall of the upper movement section 241, the lower end of the first spring member 26 is connected with the upper movement seat 251, the second spring member 27 is located in the lower movement section 243, the upper end of the second spring member 27 is connected with the lower movement seat 252, the lower end of the second spring member 27 is connected with the bottom of the lower movement section 243, thus when the valve rod 25 is driven to move downward, the upper movement seat 251 and the lower movement seat 252 move downward along the upper movement section 241 and the lower movement section 243 respectively, the upper movement seat 251 is stretched elastically by moving downward, the lower movement seat 252 is pressed elastically by moving downward, thus when the air pressure in the upper air inlet cavity 23 decreases, the valve rod 25 and the valve core 12 move upward under the action of the first spring member 26 and the second spring member 27 until the initial state is restored.

[0030] In the embodiment, preferably, the buffer blades 32 are multiple, the multiple buffer blades 32 are sequentially and spacedly arranged along the circumference of the rotating body 31, the buffer blades 32 are blocked in the flow direction of the liquid along the water inlet channel 14, the buffer blades 32 are provided with multiple flow holes, the multiple flow holes are sequentially and juxtaposedly arranged along the buffer blades 32; the multiple buffer blades 32 can also be provided with a connecting ring which is connected together, the connecting ring surrounds the multiple buffer blades 32 so as to connect the multiple buffer blades 32 together, in the use process, when the liquid is delivered into the water inlet channel 14, the liquid drives the buffer blades 32, so that the buffer blades 32 are driven to rotate, the rotation of the buffer blades 32 can buffer the flow of the liquid.

[0031] In the embodiment, preferably, first and second buffering springs 35 and 36 are arranged oppositely, the opposite ends of the rotating body 31 are provided with sliding seats 33, the opposite sides of the water inlet channel 14 are provided with sliding grooves 34, the sliding seats 33 are slidingly connected in the sliding grooves 34, the first and second buffering springs 35 and 36 are arranged on the opposite sides of the sliding seats 33 respectively, the elastic coefficients of the first and second buffering springs 35 and 36 can be different, so that in use, when the liquid flow rate in the water inlet channel 14 is small, the impact force of the liquid on the rotating body 31 and the buffering blades 32 is small, only the buffering blades 32 rotate, and the sliding seats 33 do not move, and when the liquid flow rate in the water inlet channel 14 is large, the impact force of the liquid on the rotating body 31 and the buffering blades 32 is increased, at this time, under the action of the liquid flow, the rotating body 31 and the buffering blades 32 are driven to move the sliding seats 33 along the sliding grooves 34, the movement of the sliding seats 33 elastically presses the first buffering spring 35 and elastically pulls the second buffering spring 36, so that the rotating body 31 and the buffering blades 32 move in the water inlet channel 14 to buffer the liquid flow, and when the impact force of the liquid flow on the rotating body 31 and the buffering blades 32 is small, under the action of the first and second buffering springs 35 and 36, the sliding seats 33 are driven to the initial state.

[0032] The above only describes certain exemplary embodiments of the present application by way of illustration, and it is needless to say that the described embodiments can be modified in various ways without departing from the spirit and scope of the present application for those skilled in the art. Therefore, the above drawings and descriptions are illustrative in nature and should not be understood as limiting the scope of protection of the claims of the present application.

Claims

1. An improved pneumatic control valve, comprising a valve body and a valve head support disposed on the valve body, characterized in that, The valve body has a valve cavity inside, and a valve core is disposed inside the valve cavity. A valve cover is sealed and fixed on the valve body. A valve head bracket is fixedly connected to the valve cover. A valve stem and a pneumatic actuator are disposed on the valve head bracket. The pneumatic actuator is installed on the top of the valve head bracket. The upper end of the valve stem coaxially passes through the valve cover and the valve head bracket and is connected to the working end of the pneumatic actuator. The pneumatic actuator drives the valve core to open and close through the valve stem. The valve body has an inlet channel and an outlet channel on opposite sides. The valve cavity includes an arc-shaped inlet cavity, an arc-shaped outlet cavity, and a connecting cavity connecting the arc-shaped inlet cavity and the arc-shaped outlet cavity. The position of the arc-shaped inlet cavity is lower than that of the arc-shaped outlet cavity. The inlet channel is connected to the arc-shaped inlet cavity, and the outlet channel is connected to the arc-shaped outlet cavity. An anti-scouring component is provided inside the inlet channel. The anti-scouring component includes a rotating body and buffer blades disposed on the rotating body.

2. The improved pneumatic regulating valve according to claim 1, characterized in that, The pneumatic actuator includes a pneumatic cavity disposed on the top of the valve head bracket and a pneumatic diaphragm disposed within the pneumatic cavity. The pneumatic diaphragm divides the pneumatic cavity into an upper air inlet cavity and a lower drive cavity.

3. The improved pneumatic regulating valve according to claim 1, characterized in that, The valve head support has a movement channel inside for the valve stem to move. The movement channel includes an upper movement section, a middle section, and a lower movement section.

4. The improved pneumatic regulating valve according to claim 3, characterized in that, The valve stem is provided with an upper moving seat and a lower moving seat. The upper moving seat is slidably connected in the upper moving section, and the lower moving seat is slidably connected in the lower moving section.

5. The improved pneumatic regulating valve according to claim 4, characterized in that, It also includes a first spring and a second spring that are sleeved on the valve stem, the first spring being located within the upper moving section and the second spring being located within the lower moving section.

6. The improved pneumatic regulating valve according to claim 1, characterized in that, There are multiple buffer blades, which are arranged sequentially at intervals along the circumference of the rotating body, and the buffer blades block the flow of liquid along the water inlet channel.

7. The improved pneumatic regulating valve according to claim 6, characterized in that, The buffer blade is provided with multiple flow holes, which are arranged in parallel along the buffer blade.

8. The improved pneumatic regulating valve according to claim 7, characterized in that, The rotating body is provided with sliding seats at both ends, and the water inlet channel is provided with sliding grooves on both sides. The sliding seats are slidably connected in the sliding grooves.

9. The improved pneumatic regulating valve according to claim 8, characterized in that, It also includes a first buffer spring and a second buffer spring that are arranged opposite to each other, with the first buffer spring and the second buffer spring respectively disposed on opposite sides of the sliding seat.

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