Piston type valve

Abstract

The utility model belongs to the technical field of piston valves, and particularly relates to a piston type valve which comprises a protective outer shell, two connecting pipes and a driving telescopic machine, a piston valve body is connected to the inner wall of the protective outer shell in a sliding mode, a spherical groove is formed in the bottom end of the piston valve body, and a ball is fixedly connected to the inner wall of the protective outer shell. Pressure relief covers are fixedly connected to the top ends of the two connecting pipes, piston plates are slidably connected to the inner walls of the pressure relief covers, and springs are fixedly connected to the top ends of the piston plates. The piston valve body is clamped with the ball body through the spherical groove, the connecting range between the piston valve body and the protective outer shell is enlarged, the stability and the sealing performance of the piston valve body during valve closing of the device are improved, the two piston plates are pressed to slide upwards, so that the inner space of the pressure relief cover can cope with pressure release in a connecting pipe and a pipeline, and the safety of the device is improved. Therefore, the situations that the sealing of the device fails due to overlarge pressure, the valve is blocked or the valve is burst open, and the connecting pipe and the pipeline are disconnected are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of piston valves, and in particular relates to a piston type valve. Background Art

[0002] A piston valve is a valve that controls the flow of liquid through a piston. The piston valve has a high sealing performance in the closed state due to the good sealing performance between the piston and the valve body. It has a simple structure, high reliability and easy later maintenance and repair. It has been widely used in the industrial field.

[0003] However, in actual use, the inside of the piston valve will be affected by the liquid when the liquid flows. If the fluid pressure exceeds the design standard of the valve, the piston valve may have problems, such as seal failure, valve jamming or valve being flushed open, piston valve disconnected from the pipe body, etc., which greatly affects the normal use of the piston valve and the circulation and transmission of the liquid. Utility Model Content

[0004] The utility model provides a piston type valve, which has the characteristics of solving the problems of piston valve damage and sealing failure caused by high fluid pressure in a pipe.

[0005] The utility model provides the following technical solution: it includes a protective outer shell, two connecting pipes and a driving telescopic machine, the two connecting pipes are both communicated with the internal space of the protective outer shell, the inner wall of the protective outer shell is slidably connected with a piston valve body, the piston valve body is fixedly connected to the output end of the driving telescopic machine, a spherical groove is opened at the bottom end of the piston valve body, the inner wall of the protective outer shell is fixedly connected with a ball, the piston valve body is engaged with the ball through the spherical groove, the piston valve body blocks the passages of the two connecting pipes, the top ends of the two connecting pipes are both fixedly connected with pressure relief covers, the inner wall of the pressure relief covers is slidably connected with a piston plate, the top end of the piston plate is fixedly connected with a spring, the spring is fixedly connected to the inner wall corresponding to the top end of the pressure relief cover, and the pressure relief cover is communicated with the internal space of the connecting pipes.

[0006] Wherein, the inner wall of the spherical groove and the bottom end of the piston valve body are both fixedly connected with a sealing gasket, and the sealing gasket is in contact with the top end and side wall of the sphere.

[0007] Wherein, a reflux groove is provided in each of the two connecting pipes, and the connecting pipe is connected with the internal space of the connecting pipe through the corresponding reflux groove, and a one-way valve is installed on the inner wall of the two reflux grooves.

[0008] Among them, the top of the piston plate is fixedly connected to a limiting guide rod, the limiting guide rod passes through the corresponding top of the pressure relief cover, the piston plate drives the limiting guide rod to slide and connect to the inner wall of the pressure relief cover, and the side wall of the limiting guide rod is provided with scale lines.

[0009] Among them, an alarm is installed on the top of the limit guide rod, and the alarm is located corresponding to the top of the pressure relief hood. Two touch-pressure switches corresponding to the alarm are installed on the top of the piston plate. The touch-pressure switches are in contact with the inner wall of the top of the pressure relief hood, and air holes are opened on both sides of the pressure relief hood.

[0010] The beneficial effects of the utility model are as follows: the piston valve body is engaged with the ball through the spherical groove, thereby increasing the connection range between the piston valve body and the protective outer shell, and the ball limits the piston valve body to prevent the piston valve body from being offset due to pressure, thereby increasing the stability and sealing of the piston valve body when the device closes the valve, and the two piston plates slide upward under pressure to enable the internal space of the pressure relief cover to cope with the pressure release in the connecting pipe and the pipeline, thereby reducing the occurrence of device sealing failure due to excessive pressure, valve obstruction or valve being rushed open, and disconnection between the connecting pipe and the pipeline, thereby ensuring the normal use of the piston valve and the normal circulation and transmission of the liquid.

[0011] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0013] Figure 2 It is a front view cross-sectional structural schematic diagram of the utility model;

[0014] Figure 3 for Figure 2 A schematic diagram of the enlarged structure of the middle part A;

[0015] Figure 4 It is a three-dimensional enlarged distribution diagram between the piston valve body and the spherical body in the utility model.

[0016] In the figure: 1. protective outer shell; 11. connecting pipe; 12. driving telescopic machine; 13. ball; 14. reflux groove; 141. one-way valve; 2. piston valve body; 21. spherical groove; 22. sealing gasket; 3. pressure relief cover; 31. piston plate; 32. spring; 33. limit guide rod; 331. scale line; 34. alarm; 341. touch pressure switch; 35. air hole. DETAILED DESCRIPTION

[0017] See also Figure 1-Figure 4The utility model provides the following technical solutions: it includes a protective outer shell 1, two connecting pipes 11 and a driving telescopic machine 12, the two connecting pipes 11 are both connected to the internal space of the protective outer shell 1, the inner wall of the protective outer shell 1 is slidably connected with a piston valve body 2, the piston valve body 2 is fixedly connected to the output end of the driving telescopic machine 12, a spherical groove 21 is provided at the bottom end of the piston valve body 2, a ball 13 is fixedly connected to the inner wall of the protective outer shell 1, the piston valve body 2 is engaged with the ball 13 through the spherical groove 21, the piston valve body 2 blocks the passages of the two connecting pipes 11, the top ends of the two connecting pipes 11 are both fixedly connected with a pressure relief cover 3, the inner wall of the pressure relief cover 3 is slidably connected with a piston plate 31, the top end of the piston plate 31 is fixedly connected with a spring 32, the spring 32 is fixedly connected to the inner wall of the top end of the corresponding pressure relief cover 3, and the pressure relief cover 3 is connected to the internal space of the connecting pipe 11.

[0018] In this embodiment: the protective outer shell 1 supports the various components of the device, the protective outer shell 1 is connected to the external pipeline through two connecting pipes 11, and the telescopic machine 12 is driven to drive the piston valve body 2, so that the piston valve body 2 can be adjusted up and down in height inside the protective outer shell 1. When the piston valve body 2 slides downward, the piston valve body 2 is docked with the ball 13 through the spherical groove 21, and the piston valve body 2 blocks the passage between the protective outer shell 1 and the two connecting pipes 11, so that the liquid circulation is closed, and the connection between the spherical groove 21 and the ball 13 increases the connection range between the piston valve body 2 and the protective outer shell 1, and the ball 13 limits the piston valve body 2 to prevent the piston valve body 2 from being deviated due to pressure, thereby increasing the stability and sealing of the piston valve body 2 when the device is closed. The two pressure relief covers 3 are located on both sides of the protective outer shell 1, and the piston plate 3 1 blocks the internal space of the pressure relief cover 3, so that when the device closes the valve, the two pressure relief covers 3 can adapt and regulate the liquid pressure inside the two connecting pipes 11. When the liquid pressure inside the connecting pipe 11 is relatively large, the pressure is transmitted to the position of the piston plate 31, so that the piston plate 31 can slide upward under pressure, and the spring 32 pushes the piston plate 31 downward, so that the piston plate 31 can resist the pressure of the liquid. By moving the piston plate 31 upward, the internal space of the pressure relief cover 3 below the piston plate 31 is connected with the connecting pipe 11, so that the pressure inside the connecting pipe 11 can be released into the pressure relief cover 3, and then the pressure inside the connecting pipe 11 and the pipeline is reduced, thereby reducing the occurrence of device sealing failure due to excessive pressure, valve blocking or valve being rushed open, and disconnection of the connecting pipe 11 from the pipeline. Therefore, the normal use of the piston valve and the normal circulation and transmission of the liquid can be ensured.

[0019] The inner wall of the spherical groove 21 and the bottom end of the piston valve body 2 are fixedly connected with a sealing gasket 22, and the sealing gasket 22 is in contact with the top and side wall of the sphere 13; when the piston valve body 2 is connected to the sphere 13 through the spherical groove 21, the piston valve body 2 is squeezed and contacted with the bottom inner wall of the protective outer shell 1 and the sphere 13 through the sealing gasket 22, thereby increasing the sealing effect, thereby preventing liquid leakage in the case of blocking, and improving stability.

[0020] A reflux groove 14 is provided in each of the two connecting pipes 11, and the connecting pipe 11 is connected to the internal space of the connecting pipe 11 through the corresponding reflux groove 14, and a one-way valve 141 is installed on the inner walls of the two reflux grooves 14; when the piston valve body 2 slides downward for sealing, the piston valve body 2 squeezes the liquid in the recessed area around the sphere 13, and the liquid enters the corresponding connecting pipe 11 through the conduction of the reflux groove 14 to prevent liquid residue from affecting the sealing function of the piston valve body 2, and the one-way valve 141 blocks the loop of the liquid in the reflux groove 14 to prevent the liquid from flowing back into the space around the sphere 13.

[0021] The top of the piston plate 31 is fixedly connected to a limiting guide rod 33, and the limiting guide rod 33 passes through the top of the corresponding pressure relief cover 3. The piston plate 31 drives the limiting guide rod 33 to be slidably connected to the inner wall of the pressure relief cover 3, and the side wall of the limiting guide rod 33 is provided with a scale line 331; the piston plate 31 supports the limiting guide rod 33, and the pressure relief cover 3 slides and limits the piston plate 31 through the limiting guide rod 33, so that the limiting guide rod 33 can drive the piston plate 31 to maintain a stable slide and prevent the piston plate 31 from tilting. When the piston plate 31 pushes the limiting guide rod 33 to slide upward, by observing the positional relationship between the scale line 331 on the limiting guide rod 33 and the top of the pressure relief cover 3, it is convenient to judge the rising height of the piston plate 31 at this time, and then it is convenient to judge the pressure value of the medium liquid at this time.

[0022] An alarm 34 is installed at the top of the limit guide rod 33, and the alarm 34 is located at the top of the corresponding pressure relief hood 3. Two touch-pressure switches 341 corresponding to the alarm 34 are installed at the top of the piston plate 31. The touch-pressure switches 341 are in contact with the inner wall of the top of the pressure relief hood 3, and air holes 35 are opened on both sides of the pressure relief hood 3; the limit guide rod 33 supports the alarm 34, and the piston plate 31 supports the touch-pressure switches 341. When the pressure in the connecting pipe 11 and the pipeline is too large, the piston plate 31 drives the two touch-pressure switches 341 to slide upward, and the touch-pressure switches 341 are pressurized when contacting the inner wall of the pressure relief hood 3, so that the touch-pressure switches 341 can trigger the alarm 34 to sound an alarm, so that the staff can deal with it in time to avoid the situation where the pressure continues to increase and cause damage and leakage of the device. The air holes 35 can facilitate the airflow in and out of the pressure relief hood 3, so that when the piston plate 31 rises and falls, the pressure in the internal space of the pressure relief hood 3 above the piston plate 31 is in a balanced state.

[0023] The working principle and use process of the utility model are as follows: when the pressure of the liquid inside the connecting pipe 11 is relatively large, the pressure is transmitted to the position of the piston plate 31, so that the piston plate 31 can slide upward under pressure, and the spring 32 pushes the piston plate 31 downward, and the piston plate 31 pushes the limit guide rod 33 to slide upward. By observing the position relationship between the scale line 331 on the limit guide rod 33 and the top of the pressure relief cover 3, it is convenient to judge the rising height of the piston plate 31 at this time, and then it is convenient to judge the pressure value of the medium liquid at this time. When the pressure in the connecting pipe 11 and the pipeline is too large, the piston plate 31 drives the two touch pressure switches 341 to slide upward. The touch pressure switches 341 are pressurized when they contact the inner wall of the pressure relief cover 3, so that the touch pressure switches 341 can trigger the alarm 34 to sound an alarm, so that the staff can promptly Processing is carried out to avoid the situation where the pressure continues to increase and causes damage and leakage of the device, thereby reducing the occurrence of device sealing failure, valve jamming or valve being rushed open, and disconnection of the connecting pipe 11 from the pipeline due to excessive pressure. Therefore, the normal use of the piston valve and the normal circulation and transmission of the liquid can be ensured. When the device closes the valve, the control driving telescopic machine 12 pushes the piston valve body 2 to slide downward, and the piston valve body 2 is engaged and connected with the ball 13 through the spherical groove 21 and the sealing gasket 22, thereby increasing the connection range between the piston valve body 2 and the protective outer shell 1, and the ball 13 limits the piston valve body 2 to prevent the piston valve body 2 from being offset due to pressure, thereby increasing the stability and sealing of the piston valve body 2 when the device closes the valve.

Claims

1. A piston valve, comprising a protective outer shell (1), two connecting pipes (11) and a driving telescopic machine (12), characterized in that: The two connecting pipes (11) are both connected to the internal space of the protective outer shell (1); the inner wall of the protective outer shell (1) is slidably connected to a piston valve body (2); the piston valve body (2) is fixedly connected to the output end of the driving telescopic machine (12); a spherical groove (21) is provided at the bottom end of the piston valve body (2); a sphere (13) is fixedly connected to the inner wall of the protective outer shell (1); the piston valve body (2) is engaged with the sphere (13) through the spherical groove (21); the piston valve body (2) blocks the passages of the two connecting pipes (11); the top ends of the two connecting pipes (11) are both fixedly connected to a pressure relief cover (3); the inner wall of the pressure relief cover (3) is slidably connected to a piston plate (31); the top end of the piston plate (31) is fixedly connected to a spring (32); the spring (32) is fixedly connected to the inner wall of the corresponding top end of the pressure relief cover (3); the pressure relief cover (3) is connected to the internal space of the connecting pipe (11).

2. A piston valve according to claim 1, characterized in that: The inner wall of the spherical groove (21) and the bottom end of the piston valve body (2) are both fixedly connected with a sealing gasket (22), and the sealing gasket (22) is in contact with the top and side wall of the sphere (13).

3. A piston valve according to claim 1, characterized in that: A reflux groove (14) is provided in each of the two connecting pipes (11); the connecting pipe (11) is connected to the internal space of the connecting pipe (11) via the corresponding reflux groove (14); and a one-way valve (141) is installed on the inner wall of each of the two reflux grooves (14).

4. A piston valve according to claim 1, characterized in that: The top end of the piston plate (31) is fixedly connected to a limiting guide rod (33), the limiting guide rod (33) passes through the top end of the corresponding pressure relief cover (3), the piston plate (31) drives the limiting guide rod (33) to be slidably connected to the inner wall of the pressure relief cover (3), and the side wall of the limiting guide rod (33) is provided with a scale line (331).

5. A piston valve according to claim 4, characterized in that: An alarm (34) is installed at the top of the limit guide rod (33), and the alarm (34) is located at the top of the corresponding pressure relief cover (3). Two touch-pressure switches (341) corresponding to the alarm (34) are installed at the top of the piston plate (31), and the touch-pressure switches (341) are in contact with the inner wall of the top of the pressure relief cover (3). Air holes (35) are opened on both sides of the pressure relief cover (3).

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