CN204729726U - A kind of pilot type diaphragm electromagnetic switch valve - Google Patents

Abstract

The utility model discloses a pilot-operated diaphragm electromagnetic switch valve, which comprises a valve body, a main valve core, a moving iron core assembly, a magnetic isolation tube, a diaphragm and a coil assembly. Liquid port and liquid outlet, the main valve core is set on the valve body through the valve cover, the center of the main valve core is provided with a pilot hole, and the main valve core is provided with a The diaphragm of the liquid port, the moving iron core assembly is arranged above the main valve core, the magnetic isolation tube is sleeved outside the moving iron core assembly, and the coil assembly is arranged outside the magnetic isolation tube And lock it with a nut, a return spring is provided between the moving iron core assembly and the magnetic isolation tube, and an accommodation cavity is opened on the bottom surface of the moving iron core assembly, and a pilot hole seal is arranged in the accommodation cavity Assemblies, the liquid inlet is provided with a filter. The above-mentioned electromagnetic switching valve can effectively filter impurities in the medium pipeline, and has the characteristics of simple structure, convenient maintenance and high reliability.

Description

A pilot-operated diaphragm electromagnetic switch valve

technical field

The utility model relates to an electromagnetic on-off valve, in particular to a pilot-operated diaphragm electromagnetic on-off valve which is suitable for a liquid working medium with impurities and can realize pipeline on-off.

Background technique

The pilot solenoid valve is a commonly used solenoid valve in the hydraulic system. The on-off function of the electromagnetic switch valve in the pipeline is mainly realized by the diaphragm on the main valve core, and the tightness between the diaphragm and the valve directly affects the performance of the entire valve. In actual working conditions, the impurities in the liquid medium can easily cause the main valve core to be stuck, the valve seal is not tight or the damping hole of the diaphragm is blocked, resulting in the failure of the electromagnetic switch valve, thus affecting the use of the entire system.

Utility model content

The purpose of this utility model is to provide a pilot-operated diaphragm electromagnetic switch valve, which has the characteristics of good sealing and is more suitable for liquid media with impurities, so as to solve the above-mentioned problems existing in the pilot-operated diaphragm electromagnetic switch valve in the prior art .

For this purpose, the utility model adopts the following technical solutions:

A pilot-operated diaphragm electromagnetic switch valve, which includes a valve body, a main valve core, a moving iron core assembly, a magnetic isolation tube, a diaphragm and a coil assembly, and two ends of the valve body are provided with connected liquid inlets and the liquid outlet, the main valve core is set on the valve body through the valve cover, the center of the main valve core is provided with a pilot hole, and the main valve core is provided with a Diaphragm, the moving iron core assembly is arranged above the main valve core, the magnetic isolation tube is sleeved outside the moving iron core assembly, the coil assembly is arranged outside the magnetic isolation tube and nuts Locking, a return spring for the moving iron core assembly is provided between the moving iron core assembly and the magnetic isolation tube, wherein the bottom surface of the moving iron core assembly is provided with a housing at the position corresponding to the pilot hole cavity, the accommodating cavity is provided with a pilot hole sealing assembly, and the liquid inlet is provided with a filter.

In particular, the pilot hole sealing assembly includes a sealing spring and a pilot hole sealing gasket arranged in the accommodating cavity from inside to outside.

In particular, sealing rings are provided between the valve body and the valve cover and between the valve cover and the magnetic isolation tube.

In particular, the filter screen is a long tapered structure with one end open, and its open end is arranged in accordance with the inner diameter of the liquid inlet, and the open end of the filter screen is arranged in the liquid inlet through a retaining ring.

In particular, the filter mesh is made of stainless steel.

The beneficial effect of the utility model is that, compared with the prior art, the sealing assembly is arranged between the bottom surface of the moving iron core assembly and the pilot hole of the pilot-operated diaphragm electromagnetic switch valve, and a filter device is installed on the liquid inlet at the same time , so that the valve not only has better sealing performance, but also has anti-pollution ability, greatly reduces the cleanliness requirements of the working medium, and effectively improves the reliability and life of the electromagnetic switch valve.

Description of drawings

Fig. 1 is the sectional view of the pilot-operated diaphragm electromagnetic switching valve provided by Embodiment 1 of the utility model;

Fig. 2 is a top view of the pilot-operated diaphragm electromagnetic switch valve provided in Embodiment 1 of the present utility model.

In the picture:

1. Valve body; 2. Main valve core; 3. Moving iron core assembly; 4. Magnetic isolation tube; 5. Diaphragm; 6. Coil assembly; 7. Liquid inlet; 8. Liquid outlet; 9. Valve Cover; 10, pilot hole; 11, nut; 12, return spring; 13, accommodating chamber; 14, sealing spring; 15, pilot hole sealing gasket; 16, filter screen; 17, retaining ring;

Detailed ways

The technical scheme of the utility model will be further described below in conjunction with the accompanying drawings and through specific embodiments.

Please refer to Figure 1 and Figure 2, in this embodiment, a pilot-operated diaphragm electromagnetic switch valve includes a valve body 1, a main valve core 2, a moving iron core assembly 3, a magnetic isolation tube 4, a diaphragm 5 and a coil Assembly 6, the two ends of the valve body 1 are provided with connected liquid inlet 7 and liquid outlet 8, the main valve core 2 is set on the valve body 1 through the valve cover 9, the main valve The center of the core 2 is provided with a pilot hole 10 corresponding to the liquid channel, and the main valve core 2 is provided with a diaphragm 5 for blocking the liquid inlet 7 and the liquid outlet 8, and the moving iron core assembly 3 is arranged on the Above the main valve core 2, the magnetic isolation tube 4 is set outside the moving iron core assembly 3, the coil assembly 6 is arranged outside the magnetic isolation tube 4 and locked with a nut 11, and the moving iron A return spring 12 for the moving iron core assembly 3 is arranged between the core assembly 3 and the magnetic isolation tube 4, the moving iron core assembly 3 moves up and down along the inner hole of the magnetic isolation tube 4, and the moving iron core The bottom surface of the assembly 3 is provided with a housing chamber 13 at the position corresponding to the pilot hole 10, and the housing chamber 13 is provided with a sealing spring 14 and a pilot hole sealing gasket 15 sequentially from the inside to the outside to increase the pressure of the pilot valve port. of tightness.

The liquid inlet 7 is provided with a filter screen 16, which can effectively filter out impurities in the working medium. The filter screen 16 is made of stainless steel, and it is a long tapered structure with one end open. within 7.

A sealing ring 18 is provided between the valve body 1 and the valve cover 9 and between the valve cover 9 and the magnetic isolation tube 4 . To increase the sealing of the electromagnetic switch valve.

When working, the moving iron core assembly 3 opens the pilot hole 10 on the main valve core 2, so that the pressure in the upper chamber of the valve body 1 drops rapidly, and a pressure difference is formed between the upper and lower chambers of the main valve, relying on the pressure difference of the medium to push the diaphragm 5, The main valve core 2 moves up and the valve opens. At this time, the fluid medium enters the valve body 1 after filtering impurities through the filter screen 16, and flows out from the outlet; when the moving iron core assembly 3 closes the pilot hole 10, the fluid medium quickly passes through the diaphragm 5. The small hole 7 enters the upper chamber of the valve body 1, so that the pressure of the upper and lower chambers of the valve body 1 is equal, and the moving iron core assembly 3 and the main valve core 2 close the valve under the action of the return spring 12.

The above embodiments have only set forth the basic principles and characteristics of the present utility model, and the present utility model is not limited by the above examples. Under the premise of not departing from the spirit and scope of the present utility model, the present utility model also has various changes and changes. These changes All changes and modifications fall within the scope of the claimed utility model. The scope of protection required by the utility model is defined by the appended claims and their equivalents.

Claims (5)

1. a pilot type diaphragm electromagnetic switch valve, it comprises valve body, main valve plug, dynamic core assembly, plunger tube, diaphragm and coil assembly, the two ends of described valve body are provided with the liquid entering hole and liquid outlet that are connected, described main valve plug is arranged on described valve body by valve gap, the center of described main valve plug offers pilot hole, and described main valve plug is provided with for cut off into, the diaphragm of liquid outlet, described dynamic core assembly is arranged at the top of described main valve plug, described plunger tube is placed on outside described dynamic core assembly, described coil assembly is arranged at described plunger tube outward also with nut check, the Returnning spring for dynamic core assembly is provided with between described dynamic core assembly and described plunger tube, it is characterized in that, the position of the corresponding described pilot hole in bottom surface of described dynamic core assembly offers holding cavity, pilot hole black box is provided with in described holding cavity, described liquid entering hole place is provided with filter screen.

2. pilot type diaphragm electromagnetic switch valve according to claim 1, is characterized in that, described pilot hole black box comprises and is arranged at Packing spring in described holding cavity and pilot hole sealing gasket from inside to outside.

3. pilot type diaphragm electromagnetic switch valve according to claim 1 and 2, is characterized in that, is provided with seal ring between described valve body and described valve gap and between described valve gap and described plunger tube.

4. pilot type diaphragm electromagnetic switch valve according to claim 1, is characterized in that, described filter screen is the long cone structure of one end open, and its opening end coordinates the internal diameter of liquid entering hole to arrange, and the opening end of described filter screen is arranged in liquid entering hole by back-up ring.

5. the pilot type diaphragm electromagnetic switch valve according to claim 1 or 4, is characterized in that, described filter screen is made up of stainless steel material.