CN204327991U - Piston Solenoid Valve - Google Patents

Abstract

The utility model discloses a piston type electromagnetic valve, which comprises a valve body, a valve cover, a piston component, a fixed iron core, a movable iron core and a coil; an upper cavity is formed between the upper surface of the piston assembly and the inner wall of the valve cover, a throttling hole is formed in the piston assembly, a piston sealing element is arranged on the piston assembly, a central shaft is arranged on the piston assembly, and pressure relief holes are formed in the upper end surface and the lower end surface of the central shaft in an axial penetrating mode; the magnetic insulation pipe is connected to the valve cover, the coil is arranged on the magnetic insulation pipe, and the movable iron core is electrified and powered off through the coil to achieve attraction and separation in the magnetic insulation pipe. The movable iron core can be movably arranged right above the central shaft up and down, a first spring is sleeved on the movable iron core, and a second spring is connected between the movable iron core and the central shaft. The second spring is connected between the movable iron core and the central shaft and is matched with the fixed iron core and the coil, so that the product can be started under zero pressure, the highest pressure can reach 5MPa, and the pressure range is 0-5.0 MPa, so that the application range of the product is expanded, and convenience is brought to use.

Description

Piston Solenoid Valve

technical field

The utility model relates to the electromagnetic valve domain technology, in particular to a piston type electromagnetic valve.

Background technique

Solenoid valve (Electromagnetic valve) is an industrial equipment controlled by electromagnetic. It is an automatic basic component used to control fluid. It belongs to actuator and is not limited to hydraulic and pneumatic. It is used to adjust the direction, flow, speed and other parameters of the medium in the industrial control system. Solenoid valves can cooperate with different circuits to achieve the expected control, and the control accuracy and flexibility can be guaranteed. There are many kinds of solenoid valves. Different solenoid valves play a role in different positions of the control system. The most commonly used ones are check valves, safety valves, directional control valves, and speed regulating valves.

The pilot solenoid valve is a kind of solenoid valve. When it is energized, the electromagnetic force opens the pilot hole, the pressure in the upper chamber drops rapidly, and a pressure difference is formed around the closing part, and the fluid pressure pushes the closing part to move upward. The valve opens; when the power is off, the spring force closes the pilot hole, and the inlet pressure quickly passes through the bypass hole to form a pressure difference around the valve closing member, and the fluid pressure pushes the closing member down to close the valve.

However, the current pilot-operated solenoid valve requires a starting pressure not lower than 0.01Mpa, and the pressure range of the zero-pressure-difference solenoid valve is usually only 0-0.1Mpa, and the product range is narrow, which brings inconvenience to use.

Utility model content

In view of this, the utility model aims at the deficiencies of the prior art, and its main purpose is to provide a piston type solenoid valve, which can effectively solve the problems of narrow application range and inconvenient use of the existing solenoid valve.

In order to achieve the above object, the utility model adopts the following technical solutions:

A piston-type electromagnetic valve, including a valve body, a valve cover, a piston assembly, a fixed iron core, a coil, and a moving iron core; the valve body is separated to form an input chamber and an output chamber, and the valve body is provided with an output chamber connected to the input chamber. The valve cover is arranged on the valve body and forms a cavity with the valve body, and both the output port and the input port are connected to the cavity; the piston assembly can be moved up and down in the cavity Inside, an upper chamber is formed between the upper surface of the piston assembly and the inner wall of the valve cover, the piston assembly is provided with a throttle hole communicating between the output port and the upper chamber, and the piston assembly is provided with a piston seal for blocking the input port, The piston assembly is provided with a central shaft, and the upper and lower end surfaces of the central shaft axially penetrate to form a pressure relief hole connecting the upper chamber and the output chamber; the fixed iron core and the coil are both arranged on the valve cover, and the moving iron core can be It is movable up and down directly above the central shaft, and the moving iron core is covered with a first spring to reset the moving iron core downward. A second spring is connected between the moving iron core and the central shaft, and the moving iron core The lower end surface is provided with a moving iron core seal for sealing the pressure relief hole.

Preferably, the upper end of the central shaft is provided with a first card slot, the lower end of the moving iron core is provided with a second card slot, the lower end of the second spring is fixed in the first card slot, and the upper end of the second spring is fixed in the first card slot. Fix in the second card slot.

Preferably, an insulating tube is connected to the valve cover, the fixed iron core is placed on the top of the insulating tube and mounted on the valve cover through a nut, and the coil is placed on the insulating tube.

Preferably, the magnetic insulating tube is sheathed on the moving iron core.

Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, it can be known from the above technical solutions:

By connecting the second spring between the moving iron core and the central shaft, and cooperating with the fixed iron core and the coil, the product can be started with zero pressure, the highest pressure can reach 5Mpa, and the pressure range is 0-5.0Mpa, thereby expanding the product range. The scope of use brings convenience to use.

In order to illustrate the structural features and functions of the utility model more clearly, the utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is a sectional view of a preferred embodiment of the present utility model.

Explanation of the accompanying drawings:

10. Valve body 11. Input cavity

12. Output cavity 13. Output port

14. Input port 20. Valve cover

30. Piston assembly 301. Upper cavity

302. Throttle hole 40. Fixed iron core

50. Coil 60. Moving iron core

61. Second card slot 71. Piston seal

72. The first spring 73. The second spring

74. Moving iron core seal 75. Nut

76. Absolute magnetic tube 80. Central shaft

81. Pressure relief hole 82. The first card slot.

Detailed ways

Please refer to FIG. 1 , which shows the specific structure of a preferred embodiment of the present invention, including a valve body 10 , a valve cover 20 , a piston assembly 30 , a fixed iron core 40 , a coil 50 and a moving iron core 60 .

An input cavity 11 and an output cavity 12 are separately formed in the valve body 10 , and the valve body 10 is provided with an output port 13 communicating with the input cavity 11 and an input port 14 communicating with the output cavity 12 .

The valve cover 20 is disposed on the valve body 10 and forms a cavity surrounding the valve body 10 , and both the output port 13 and the input port 14 communicate with the cavity.

The piston assembly 30 is movable up and down in the cavity, an upper chamber 301 is formed between the upper surface of the piston assembly 30 and the inner wall of the valve cover 20, and a joint connecting the output port 13 and the upper chamber 301 is provided on the piston assembly 30. The flow hole 302, the piston assembly 30 has a piston seal 71 for blocking the input port 14, the piston assembly 30 is provided with a central shaft 80, and the upper and lower end surfaces of the central shaft 80 are axially penetrated to form a communication upper chamber 301 and an output port. Pressure relief holes 81 between chambers 12.

The fixed iron core 40 and the coil 50 are all arranged on the valve cover 20, and the moving iron core 60 can be movable up and down directly above the central axis 80. The first spring 72, the second spring 73 is connected between the moving iron core 60 and the central shaft 80, and the lower end surface of the moving iron core 60 is provided with a moving iron core seal 74 for blocking the pressure relief hole 81; and , the moving iron core 60 is provided with a magnetically insulating tube 76, which is connected to the valve cover 20, and the fixed iron core 40 is placed on the inner top of the magnetically insulating tube 76 and installed on the valve cover 20 through a nut 75. The coil 50 placed on the magnetic tube 76.

In this embodiment, the upper end of the central shaft 80 is provided with a first engaging slot 82 , the lower end of the moving iron core 60 is provided with a second engaging slot 61 , and the lower end of the second spring 73 is engaged in the first engaging slot 82 Fixed, the upper end of the second spring 73 is locked in the second slot 61 and fixed.

When the medium is under pressure, after the coil 50 is energized, the moving iron core 60 is attracted, and the moving iron core 60 moves upward, and the iron core seal 74 moves upward with the moving iron core 60 to open the pressure relief hole 81, and the upper chamber 301 Pressure release, the medium in the upper chamber 301 flows down into the output chamber 12 through the pressure relief hole 81, and at the same time, the medium in the input chamber 11 pushes the piston assembly 30 to open the solenoid valve, and the medium realizes circulation.

When the medium has no pressure or the pressure is low, after the coil 50 is energized, the moving iron core 60 is attracted, and the moving iron core 60 moves upwards, and the second spring 73 pulls the piston assembly 30 to open, thereby realizing the opening of the solenoid valve and the circulation of the medium.

When the coil 50 is de-energized, the moving iron core 60 closes the pressure relief hole 81 by the elastic force of the first spring 72, and the medium passes through the orifice 302 to boost the pressure of the upper chamber 301, and the electromagnetic valve is under the condition of the elastic force of the first spring 72 and the pressure of the upper chamber 301. Closed under the action.

The key point of the design of this utility model is: by connecting the second spring between the moving iron core and the central shaft, and cooperating with the fixed iron core and the coil, the product can be started with zero pressure, the maximum pressure can reach 5Mpa, and the pressure range is 0 ~ 5.0Mpa, thus expanding the scope of use of the product and bringing convenience to use.

The technical principles of the present utility model have been described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the utility model, and cannot be construed as limiting the protection scope of the utility model in any way. Based on the explanations herein, those skilled in the art can think of other specific implementations of the present utility model without creative work, and these forms will all fall within the protection scope of the present utility model.

Claims (4)

1. A piston-type solenoid valve, characterized in that: it includes a valve body, a valve cover, a piston assembly, a fixed iron core, a coil and a moving iron core; an input cavity and an output cavity are formed separately in the valve body, and the valve body is provided with There is an output port connected to the input chamber and an input port connected to the output chamber; the valve cover is arranged on the valve body and forms a cavity with the valve body, and the output port and the input port are connected to the cavity; the piston assembly can be moved up and down. It is movably arranged in the cavity, and an upper chamber is formed between the upper surface of the piston assembly and the inner wall of the valve cover. The piston assembly is provided with a throttle hole communicating between the output port and the upper chamber, and the piston assembly has a valve for blocking the input The piston seal of the mouth, the piston assembly is provided with a central shaft, and the upper and lower end faces of the central shaft are axially penetrated to form a pressure relief hole connecting the upper chamber and the output chamber; the fixed iron core and the coil are both arranged on the valve cover , the moving iron core can be moved up and down directly above the central shaft, the moving iron core is covered with a first spring to reset the moving iron core downward, and a second spring is connected between the moving iron core and the central shaft , and the lower end surface of the moving iron core is provided with a moving iron core seal for blocking the pressure relief hole. 2. The piston type solenoid valve according to claim 1, characterized in that: the upper end of the central shaft is provided with a first slot, the lower end of the moving iron core is provided with a second slot, and the lower end of the second spring The card is fixed in the first card slot, and the upper end of the second spring is fixed in the second card slot. 3. The piston type solenoid valve according to claim 1, characterized in that: the valve cover is connected with an insulating tube, the fixed iron core is placed on the top of the insulating tube and installed on the valve cover through a nut, and the coil is placed on the valve cover. on the magnetic tube. 4. The piston type solenoid valve according to claim 3, characterized in that: the magnetic-insulating tube is wrapped around the moving iron core.