Pilot-operated type electromagnetic valve diaphragm assembly sealing structure for waterway

Abstract

The utility model discloses a diaphragm assembly sealing structure of a pilot-operated type electromagnetic valve for a waterway, and belongs to the field of electromagnetic valves. The sealing structure comprises a diaphragm assembly and a main valve port. The diaphragm assembly is provided with a connecting blocking piece, a PTFE diaphragm, a rubber gasket, a connecting gasket and a connecting rivet. And the PTFE diaphragm and the rubber gasket are arranged between the connecting separation blades. And the rubber gasket faces the main valve port. And the rubber gasket is used for covering the main valve port. The pilot-operated type electromagnetic valve has the advantages that if the pilot-operated type electromagnetic valve has the inner leakage situation, a maintainer can detach the diaphragm assembly in advance, and after particle impurities at the position of the main valve port are completely cleaned, the diaphragm assembly is reinstalled. In view of the material characteristics of the rubber gasket, the rubber gasket can be repeatedly used, and a brand new diaphragm assembly does not need to be replaced.

Description

Technical Field

[0001] The utility model relates to the field of electromagnetic valves, in particular to a sealing structure of a diaphragm assembly of a pilot electromagnetic valve for a waterway. Background Art

[0002] The pilot solenoid valve is the most commonly used automatic control component in the automatic control and protection circuit of the refrigeration system. As the use of pilot solenoid valves becomes more and more extensive, pilot solenoid valves are no longer used only in refrigeration systems, but can also be used in water systems.

[0003] The Chinese invention application CN104100760A "Solenoid Valve" includes: a pilot valve, an upper valve chamber, a diaphragm, a throttle hole, etc. Among them, the diaphragm is made of polytetrafluoroethylene. The disadvantage is that if the solenoid valve is used in a water system, there may be intrusive particles between the diaphragm and the main valve port (there are particles in the water system), resulting in internal leakage. The current maintenance measures are: after the particles are cleaned up, replace the diaphragm with a new one. The reason for replacing the new diaphragm is that the old diaphragm is scratched by the particles under the pressure in the valve, and it cannot be used again due to the characteristics of polytetrafluoroethylene. Summary of the invention

[0004] The utility model aims to solve the technical problem in the prior art that a new diaphragm needs to be replaced after an internal leakage of a pilot-operated solenoid valve, and provides a novel sealing structure of a diaphragm assembly of a pilot-operated solenoid valve for a waterway.

[0005] In order to achieve this purpose, the technical solution of the utility model is as follows: a diaphragm assembly sealing structure for a pilot solenoid valve for a waterway, comprising: a diaphragm assembly and a main valve port. The diaphragm assembly comprises a connecting baffle, a PTFE diaphragm, a rubber gasket, a connecting gasket and a connecting rivet. The PTFE diaphragm and the rubber gasket are arranged between the connecting baffles. The rubber gasket faces the main valve port and is used to cover the main valve port.

[0006] As a preferred solution for the sealing structure of the pilot-operated solenoid valve diaphragm assembly for water channels, the connecting rivet fixedly connects the connecting baffle and the connecting gasket, and the connecting baffle and the connecting gasket jointly press the PTFE diaphragm and the rubber gasket.

[0007] As a preferred solution for the sealing structure of the diaphragm assembly of the pilot-operated solenoid valve for water channels, the PTFE diaphragm is on the connecting baffle side, and the rubber gasket is on the connecting gasket side.

[0008] As a preferred solution for the sealing structure of the pilot-operated solenoid valve diaphragm assembly for water channels, it is characterized in that the rubber gasket is made of EPDM.

[0009] As a preferred solution for the sealing structure of the pilot-operated solenoid valve diaphragm assembly for water channels, the rubber gasket is made of NBR.

[0010] Compared with the prior art, the utility model has at least the following beneficial effects: if the pilot-operated solenoid valve has internal leakage, the maintenance personnel can first remove the diaphragm assembly, and after the particle impurities at the main valve port are cleaned, reinstall the diaphragm assembly. In view of the material characteristics of the rubber gasket, the rubber gasket can be reused without replacing a new diaphragm assembly.

[0011] In addition to the technical problems solved by the utility model, the technical features that constitute the technical solution, and the beneficial effects brought about by the technical features of the technical solution described above, other technical problems that can be solved by the utility model, other technical features included in the technical solution, and the beneficial effects brought about by these technical features will be further described in detail in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural diagram of the diaphragm assembly of an embodiment of the utility model.

[0013] Figure 2 It is a structural schematic diagram of the sealing structure of an embodiment of the utility model.

[0014] Figure 3 for Figure 2 A magnified schematic diagram of center A. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below through specific implementations in combination with the accompanying drawings. It should be noted that the description of these implementations is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each implementation of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0016] See also Figure 1, a diaphragm assembly 1 is shown in the figure. The diaphragm assembly 1 comprises a connecting baffle 11, a PTFE (polytetrafluoroethylene) diaphragm 12, a rubber gasket 13, a connecting gasket 14 and a connecting rivet 15, etc. The PTFE diaphragm 12 and the rubber gasket 13 are arranged between the connecting baffles 11 and the connecting baffles 11. The PTFE diaphragm 12 is on the side of the connecting baffle 11. The rubber gasket 13 is on the side of the connecting gasket 14. The connecting rivet 15 fixes and connects the connecting baffle 11 and the connecting gasket 14. Thus, the connecting baffle 11 and the connecting gasket 14 jointly press the PTFE diaphragm 12 and the rubber gasket 13. The outer diameter of the rubber gasket 13 is larger than the inner diameter of the main valve port of the pilot solenoid valve, and has a sealing width w. The rubber gasket 13 is used to cover and seal the main valve port of the pilot solenoid valve.

[0017] Preferably, the rubber gasket 13 can be made of EPDM (ethylene propylene diene monomer rubber), NBR (nitrile butadiene rubber) or the like.

[0018] See also Figure 2 and Figure 3 , shown in the figure is a sealing structure of a pilot solenoid valve diaphragm assembly for a waterway. The sealing structure includes: the diaphragm assembly 1, the main valve port 2, a coil (not shown in the figure), a pilot valve core 3, a pilot valve port 4, etc. The rubber gasket 13 of the diaphragm assembly 1 is located above the main valve port 2. When the pilot solenoid valve is in a closed state, the rubber gasket 13 of the diaphragm assembly 1 covers the main valve port 2. Due to the existence of the rubber gasket 13, the rubber gasket 13 can separate the PTFE diaphragm 12 from the main valve port 2. Therefore, the particle impurities invading the position of the main valve port 2 are in contact with the rubber gasket 13, rather than the PTFE diaphragm 12, that is, the particle impurities at the position of the main valve port 2 only affect the rubber gasket 13. In addition, since the rubber gasket 13 has the characteristics of soft material and certain resilience, the rubber gasket 13 can be reused without replacing a new diaphragm assembly 1, which is convenient for operation. Specifically, if the pilot-operated solenoid valve has internal leakage, the maintenance personnel may remove the diaphragm assembly 1 first, and reinstall the diaphragm assembly 1 after the particle impurities at the main valve port 2 are cleaned.

[0019] In addition, the rubber gasket 13 itself has good sealing performance and low sealing surface roughness.

[0020] The working principle of the pilot solenoid valve is as follows: if the coil is energized, the magnetic field generated by the coil attracts the pilot valve core 3, so that the pilot valve port 4 is in an open state, at this time, a pressure difference is formed between the upper and lower parts of the diaphragm assembly 1, and the main valve port 2 is opened. If the coil is de-energized, the pilot valve core 3 closes the pilot valve port 4 under the combined action of its own weight and the elastic force of the spring 6, and the medium enters the upper part of the diaphragm assembly 1 through the throttle hole 5. At this time, the pressure between the upper and lower parts of the diaphragm assembly 1 is balanced, and the main valve port 2 is closed.

[0021] The above only expresses the implementation mode of the utility model, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A sealing structure of a pilot-operated solenoid valve diaphragm assembly for a waterway, characterized in that: include: Diaphragm assembly and main valve port; the diaphragm assembly comprises a connecting baffle, a PTFE diaphragm, a rubber gasket, a connecting gasket and a connecting rivet, the PTFE diaphragm and the rubber gasket are arranged between the connecting baffles, the rubber gasket faces the main valve port, and the rubber gasket is used to cover the main valve port.

2. The sealing structure of the pilot-operated solenoid valve diaphragm assembly for water channel according to claim 1, characterized in that: The connecting rivet fixedly connects the connecting baffle and the connecting gasket, and the connecting baffle and the connecting gasket jointly press the PTFE diaphragm and the rubber gasket.

3. The sealing structure of the pilot-operated solenoid valve diaphragm assembly for water channel according to claim 1, characterized in that: The PTFE diaphragm is on the connecting baffle side, and the rubber gasket is on the connecting gasket side.

4. The sealing structure of the pilot-operated solenoid valve diaphragm assembly for water channel according to any one of claims 1 to 3, characterized in that: The rubber gasket is made of EPDM.

5. The sealing structure of the pilot-operated solenoid valve diaphragm assembly for water channel according to any one of claims 1 to 3, characterized in that: The rubber gasket is made of NBR.

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