CN117989354A - Two-position three-way electromagnetic valve with overpressure protection function and electromagnetic valve control method - Google Patents

Abstract

The application provides a two-position three-way electromagnetic valve with an overpressure protection function and an electromagnetic valve control method, wherein the two-position three-way electromagnetic valve comprises a three-way main valve, a spring safety valve and an electromagnetic pilot valve; the three-way main valve is provided with a first inlet, a first working port and a first emptying port; the spring safety valve is provided with a second inlet, a second working port and a second emptying port; the electromagnetic pilot valve is provided with a third inlet, a third working port and a third emptying port; the second inlet is communicated with the first inlet; the second working hole is communicated with a piston cavity of the three-way main valve through a third working port; the second emptying port is communicated with the first emptying port; the third inlet is communicated with the first inlet, and the third emptying port is communicated with the first emptying port. The application has the functions of automatic reversing under overpressure, forced reversing when power is on, pressure relief or power-off reset. The solenoid pilot valve has a real-time valve position feedback signal. The tripping pressure of the spring safety valve is adjustable, and the spring safety valve is provided with a limiting feedback signal, so that the tripping setting state of the safety valve can be fed back, and the tripping of the set pressure can be ensured.

Description

Two-position three-way electromagnetic valve with overpressure protection function and electromagnetic valve control method

Technical Field

The application relates to the technical field of electromagnetic valves, in particular to a two-position three-way electromagnetic valve with an overpressure protection function and an electromagnetic valve control method.

Background

As is well known, two-position three-way solenoid valves are commonly known as direct-acting and pilot-operated. The direct-acting electromagnetic valve directly drives the valve disc to move by electromagnetic force, and is communicated with and commutates the pipeline working medium. The pilot valve is divided into a pilot valve and a main valve, wherein the pilot valve is driven by electromagnetic force, and the main valve is driven by medium force. The valve working medium is generally used under normal temperature environment conditions and used for pneumatic and hydraulic pipeline control, but cannot be used in high-temperature high-pressure steam medium, and cannot meet the demands of people on the two-position three-way electromagnetic valve.

Therefore, there is a need for a two-position three-way electromagnetic valve with an overpressure protection function and an electromagnetic valve control method, which solve the technical problems in the prior art to a certain extent.

Disclosure of Invention

The application aims to provide a two-position three-way electromagnetic valve with an overpressure protection function, which has an overpressure automatic reversing, pressure releasing and resetting function, so that the two-position three-way electromagnetic valve with the overpressure protection function can be used under high-temperature and high-pressure steam medium.

The application provides a two-position three-way electromagnetic valve with an overpressure protection function, which comprises a three-way main valve, a spring safety valve and an electromagnetic pilot valve;

the spring safety valve and the electromagnetic pilot valve are parallelly used as pilot valves of the three-way main valve;

the three-way main valve is provided with a first inlet, a first working port and a first emptying port;

the spring safety valve is provided with a second inlet, a second working port and a second emptying port;

The electromagnetic pilot valve is provided with a third inlet, a third working port and a third emptying port;

the second inlet is communicated with the first inlet; the second working hole is communicated with a piston cavity of the three-way main valve through the third working hole; the second emptying port is communicated with the first emptying port;

The third inlet is communicated with the first inlet, and the third emptying port is communicated with the first emptying port.

In the above technical scheme, further, the electromagnetic pilot valve is provided with a real-time valve position feedback signal module, so that the valve position of the electromagnetic pilot valve can be fed back.

In the above technical scheme, further, the reference position of the spring safety valve is provided with a limit feedback signal module, which can feed back the set state of the spring safety valve, and output a dry contact closing signal to indicate that the set pressure is set at the preset mounting position of the jump.

In the above technical scheme, further, the electromagnetic pilot valve is a normally closed electromagnetic valve; the third working port is communicated with the third emptying port in a power-off or failure state; and in an overpressure state or an electrified state, the third inlet is communicated with the third working port, and the emptying port is cut off.

In the above technical solution, further, a plunger is disposed at the second inlet of the spring safety valve, so that the second inlet is communicated with the first inlet through the plunger.

In the above technical scheme, further, the three-way main valve, the spring safety valve and the electromagnetic pilot valve all adopt rigid sealing structures, and the three-way main valve, the spring safety valve and the electromagnetic pilot valve and the medium contact part are sealed by adopting graphite wound gaskets and silver gaskets, so that the three-way main valve, the spring safety valve and the electromagnetic pilot valve can use water or steam medium suitable for high temperature and high pressure.

In the above technical solution, further, the three-way main valve is disposed below the spring safety valve and the electromagnetic pilot valve; the first inlet and the first working hole are positioned at one side of the three-way main valve, which is far away from the spring safety valve.

In the above technical scheme, further, the electromagnetic pilot valve is a direct-acting three-way electromagnetic valve.

In the above technical scheme, further, the emptying flow channels of the parallel pilot valves adopt a throttling design, and each pilot valve can independently control the main valve to complete switching action.

And throttling assemblies are arranged in the second emptying channel of the spring safety valve corresponding to the second emptying port and the third emptying channel of the electromagnetic pilot valve corresponding to the third emptying port and used for throttling the second emptying port and the third emptying port.

The application also provides a control method of the two-position three-way electromagnetic valve with the overpressure protection function, which comprises the following control processes:

Under the overpressure state, the electromagnetic pilot valve is in a power-off state, and the electromagnetic pilot valve automatically opens the valve to discharge pressure, namely from off to on: the acting force of the medium at the second pilot valve of the spring safety valve is larger than the initial acting force of the bellows assembly and the second spring, the second pilot valve is opened, the second valve rod of the spring safety valve is blocked from a second emptying port formed at the second guide sleeve, and the medium passes through the second working port of the spring safety valve and reaches the piston chamber of the three-way main valve through the third working port of the electromagnetic pilot valve; the acting area of the piston in the piston cavity is larger than the area of the first inlet, the medium force generated by the medium pushes the piston and the first valve rod to move, the first inlet of the three-way main valve is communicated with the first working port, and the first emptying port is cut off;

After the medium pressure enters a normal pressure state from an overpressure state, the electromagnetic pilot valve is automatically closed, namely, from on to off: the acting force of a medium at the second pilot valve is smaller than the initial acting force of the second bellows assembly and the second spring, the compression action of the second bellows assembly and the second spring enables the second pilot valve and the second valve rod to reset and close the second working port, the piston chamber of the three-way main valve is not supplemented with inlet medium pressure, the pressure is discharged to the three-way main valve after passing through the second emptying port of the spring safety valve and the third emptying port of the electromagnetic pilot valve, the pressure is reduced to the pressure of the first emptying port, the acting force of the piston is close to zero, the inlet valve disc of the three-way main valve drives to close the first inlet under the action of the first inlet medium acting force, the piston port is opened, the electromagnetic pilot valve is closed, and the third inlet is cut off; the third working port is communicated with the third emptying port;

Under the condition that the safety device does not respond normally after the medium is not overpressured or overpressured, the electromagnetic pilot valve can be controlled to be forced to be opened or closed by electrifying and de-electrifying the electromagnetic coil of the electromagnetic pilot valve;

The coil assembly of the solenoid pilot valve is energized and the solenoid pilot valve is turned on by closing: the coil assembly of the electromagnetic pilot valve is excited, the movable iron core assembly pulls the third valve rod and the third valve head to overcome the iron core spring and move upwards away from the third sleeve, and the third valve head opens a third inlet on the third sleeve and closes the upper valve seat; medium directly enters a piston cavity of the three-way main valve from a third inlet of the third sleeve, the acting force of the medium pushes the piston and the first valve rod to move, the first emptying port is closed, the valve is opened, the first inlet of the three-way main valve is communicated with the first working port, and the first emptying port is cut off;

The coil assembly of the electromagnetic pilot valve is powered off, and the electromagnetic pilot valve is switched on and off: the coil assembly of the electromagnetic pilot valve is nonmagnetic, the iron core spring resets the movable iron core assembly, the third valve rod and the third valve head, the valve head closes the third inlet of the third sleeve, and the upper valve seat is opened; the piston cavity of the three-way main valve is not supplemented with inlet medium pressure, and is discharged to the rear of the three-way main valve through the second emptying port of the spring safety valve and the second emptying port of the electromagnetic pilot valve, the pressure is reduced to the pressure of the first emptying port, the acting force of the piston is close to zero, the first inlet is closed by the inlet valve disc under the driving of the acting force of the inlet medium, the piston port is opened, the electromagnetic pilot valve is closed, the third inlet is closed, and the third working port is communicated with the third emptying port.

Compared with the prior art, the application has the beneficial effects that:

The application provides a two-position three-way electromagnetic valve with an overpressure protection function, which comprises a three-way main valve, a spring safety valve and an electromagnetic pilot valve;

the spring safety valve and the electromagnetic pilot valve are parallelly used as pilot valves of the three-way main valve;

the three-way main valve is provided with a first inlet, a first working port and a first emptying port;

the spring safety valve is provided with a second inlet, a second working port and a second emptying port;

The electromagnetic pilot valve is provided with a third inlet, a third working port and a third emptying port;

the second inlet is communicated with the first inlet; the second working hole is communicated with a piston cavity of the three-way main valve through the third working hole; the second emptying port is communicated with the first emptying port;

The third inlet is communicated with the first inlet, and the third emptying port is communicated with the first emptying port.

In conclusion, the application has the functions of automatic overvoltage reversing, forced energization reversing, pressure relief or power-off reset. The electromagnetic pilot valve and the spring safety valve are parallelly arranged as the pilot valve of the three-way main valve. The solenoid pilot valve has a real-time valve position feedback signal. The jump pressure of the spring safety valve is adjustable, the second spring reference position is provided with a limiting feedback signal, the jump setting state of the safety valve can be fed back, a dry contact closing signal is output, the jump setting state is indicated at the jump preset installation position, and the jump of the set pressure can be ensured.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present application, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a two-position three-way electromagnetic valve with an overpressure protection function according to an embodiment of the present application.

Reference numerals: 1-a first stud; 2-a first nut; 3-a first locking washer; 4-a cavity inlet flange; a 5-A end seal; 6-a first main valve body; 7-a first sleeve; 8-a first inlet; 9-a first valve stem; 10-a first piston; 11-a first cylinder sleeve; 12-D end seal; 13-a first work port; 15-a piston chamber flange; 19-a third valve seat gasket; 20-a third sleeve; 21-a third valve head; 23-a third upper valve seat; 24-a third guide; 25-a third gasket; 26-a third nut; 27-a third stud; 28-a third valve sleeve assembly; 29-a third valve stem; 31-a housing gasket; 32-a moving core assembly; 33-coil assembly; 34-core spring; 35-permanent magnet rod group; 36-screws; 37-locking washer; 41-a housing; 43-a third signal component; 44-locking nut; 48-a second signal component; 52-limit switch assembly; 53-a second spring; 56-spring seats; 57-bellows assembly; 58-a second valve stem; 59-a second guide sleeve; 60-a upper gasket.

Detailed Description

The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, apparatus, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatuses, and/or systems described herein will be apparent after an understanding of the present disclosure. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but rather, obvious variations may be made upon an understanding of the present disclosure, other than operations that must occur in a specific order. In addition, descriptions of features known in the art may be omitted for the sake of clarity and conciseness.

The features described herein may be embodied in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein have been provided solely to illustrate some of the many possible ways of implementing the methods, devices, and/or systems described herein that will be apparent after understanding the present disclosure.

In the entire specification, when an element (such as a layer, region or substrate) is described as being "on", "connected to", "bonded to", "over" or "covering" another element, it may be directly "on", "connected to", "bonded to", "over" or "covering" another element or there may be one or more other elements interposed therebetween. In contrast, when an element is referred to as being "directly on," directly connected to, "or" directly coupled to, "another element, directly on," or "directly covering" the other element, there may be no other element intervening therebetween.

As used herein, the term "and/or" includes any one of the listed items of interest and any combination of any two or more.

Although terms such as "first," "second," and "third" may be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first member, component, region, layer or section discussed in examples described herein could also be termed a second member, component, region, layer or section without departing from the teachings of the examples.

For ease of description, spatially relative terms such as "above … …," "upper," "below … …," and "lower" may be used herein to describe one element's relationship to another element as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "upper" relative to another element would then be oriented "below" or "lower" relative to the other element. Thus, the term "above … …" includes both orientations "above … …" and "below … …" depending on the spatial orientation of the device. The device may also be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. Singular forms also are intended to include plural forms unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" are intended to specify the presence of stated features, integers, operations, elements, and/or groups thereof, but do not preclude the presence or addition of one or more other features, integers, operations, elements, and/or groups thereof.

Variations from the shapes of the illustrations as a result, of manufacturing techniques and/or tolerances, are to be expected. Accordingly, the examples described herein are not limited to the particular shapes shown in the drawings, but include changes in shapes that occur during manufacture.

The features of the examples described herein may be combined in various ways that will be apparent upon an understanding of the present disclosure. Further, while the examples described herein have a variety of configurations, other configurations are possible as will be apparent after an understanding of the present disclosure.

Example 1

The two-position three-way electromagnetic valve with the overpressure protection function provided by the application is described in detail below with reference to fig. 1.

The two-position three-way electromagnetic valve with the overpressure protection function comprises a three-way main valve, a spring safety valve and an electromagnetic pilot valve;

Specifically, a spring safety valve and the electromagnetic pilot valve are used as the pilot valve of the three-way main valve in parallel;

specifically, the three-way main valve has a first inlet 8, a first working port 13 and a first evacuation port; the spring safety valve is provided with a second inlet, a second working port and a second emptying port; the electromagnetic pilot valve is provided with a third inlet, a third working port and a third emptying port; the second inlet communicates with the first inlet 8; the second working hole is communicated with a piston cavity of the three-way main valve through the third working hole; the second emptying port is communicated with the first emptying port; a third inlet communicates with the first inlet 8 and the third evacuation port communicates with the first evacuation port.

More specifically, the three-way main valve comprises a first main valve body 6, a first installation cavity is formed in the first main valve body 6, the first installation cavity is used for installing at least part of a third main valve, and the third main valve comprises a third sleeve 20, a third upper valve seat 23 and a third valve sleeve assembly 28; wherein, third sleeve 20 and third upper valve seat 23 all set up in first installation intracavity, and third valve cover subassembly 28 is fixed on first main valve body 6 through the third coupling assembling, and third sleeve 20, third upper valve seat 23, third valve cover subassembly 28 communicate in proper order. The third valve sleeve assembly 28 is internally provided with a third guide body 24, one side of the third guide body 24 facing the third upper valve seat 23 is provided with a third accommodating cavity, a third valve rod 29 penetrates through along the axis of the third guide body 24, one end, close to the third upper valve seat 23, of the third valve rod 29 is provided with a third limit baffle, and a third spring is sleeved on the third valve rod 29 in the third accommodating cavity, in other words, the third limit baffle seals the third spring in the third accommodating cavity; the third limit baffle is provided with a third valve head 21 on the side facing the third sleeve 20, and a third valve stem 29 passes through the third upper valve seat 23 and seals on the third valve head 21.

Further, a third intermediate gasket is provided between the third sleeve 20 and the third upper valve seat 23, and the third sleeve 20 and the third upper valve seat 23 are sealed by the third intermediate gasket; a third middle port sealing gasket is arranged between the third valve sleeve assembly 28 and the first main valve body 6; a third gasket 25 is arranged between the limit baffle and the third valve rod 29; the third connecting assembly comprises a third stud 27, a third nut 26 and a third gasket 25, and the third gasket 25 is arranged between the third nut 26 and the third valve sleeve assembly 28; a third seat gasket 19 is provided between the third sleeve 20 and the first main valve body.

Further, the third pilot valve includes a housing 41, a coil assembly 33, a moving iron core assembly 32, an iron core spring 34; wherein, the casing 41 is sleeved at one end of the third valve sleeve assembly 28 far away from the third upper valve seat 23, and is fixed by the screw 36 and the locking gasket 37, and a casing sealing gasket 31 is arranged between the casing 41 and the third valve sleeve assembly 28.

Further, the coil assembly 33 is wound around the third valve sleeve assembly 28, the movable iron core assembly 32 can be slidably disposed in the third valve sleeve assembly 28 through a connecting rod, the connecting rod is sleeved at one end of the iron core spring 34, the permanent magnet rod group 35 is sleeved at the other end, and the third signal assembly 43 is fixedly disposed at one side of the permanent magnet rod group 35 away from the iron core spring 34 through the locking nut 44.

More specifically, the three-way main valve comprises a first main valve body 6, a cavity inlet flange 4 and a piston cavity flange 15; the cavity inlet flange 4 is connected to the first main valve body 6 through a first connecting component, the first connecting component comprises a first stud 1, a first nut 2 and a first locking gasket 3, and the first locking gasket 3 is arranged between the first nut 2 and the cavity inlet flange 4; an end A sealing piece 5 is arranged between the cavity inlet flange 4 and the first main valve body 6; the piston cavity flange 15 is connected to the first main valve body 6 by a first connection assembly, and a D-end seal 12 is provided between the piston cavity flange 15 and the first main valve body 6.

Further, a first shaft sleeve 7, a first valve rod 9, a first piston 10 and a first cylinder sleeve 11 are arranged in the first main valve body 6; one end of the first valve rod 9 is arranged in the first cylinder sleeve 11, a first piston 10 is sleeved on the first valve rod 9 positioned in the first cylinder sleeve 11, and the other end of the first valve rod 9 is provided with a first shaft sleeve 7.

More specifically, the spring relief valve: the first main valve body 6 is provided with a second installation cavity for installing at least part of a second main valve, and the second main valve comprises a second guide sleeve 59, a second valve rod 58, a bellows assembly 57 and a second spring 53; one end of the second valve rod 58 is connected with a second guide sleeve 59 and the other end is connected with a bellows assembly 57, and one end of the bellows assembly 57 away from the second valve rod 58 is provided with a second spring 53 through a spring seat 56.

Further, an A upper sealing gasket 60 is arranged between the second main valve and the three-way main valve.

Further, a limit switch assembly 52 is disposed at an end of the second spring 53 away from the spring seat 56, and a second signal assembly 48 is disposed on the limit switch assembly 52.

In conclusion, the application has the functions of automatic overvoltage reversing, forced energization reversing, pressure relief or power-off reset. The electromagnetic pilot valve and the spring safety valve are parallelly arranged as the pilot valve of the three-way main valve. The solenoid pilot valve has a real-time valve position feedback signal. The jump pressure of the spring safety valve is adjustable, the second spring reference position is provided with a limiting feedback signal, the jump setting state of the safety valve can be fed back, a dry contact closing signal is output, the jump setting state is indicated at the jump preset installation position, and the jump of the set pressure can be ensured.

In this embodiment, a third signal assembly 43 is provided on the solenoid pilot valve, and a real-time valve position feedback signal module is provided inside the third signal assembly 43 and is capable of feeding back the valve position of the solenoid pilot valve.

In this embodiment, the reference position of the spring safety valve has a limit feedback signal module (the limit feedback signal module is generated by the second signal component 48) that can feed back the set state of the spring safety valve, and output a dry contact closing signal, which indicates that the set pressure is set at the preset installation position of the jump.

In this embodiment, the solenoid pilot valve is a normally closed solenoid valve; in the power-off or failure state, a third working port is communicated with the third emptying port; and in an overpressure state or an electrified state, the third inlet is communicated with the third working port, and the emptying port is cut off.

In this embodiment, a plunger is provided at the second inlet of the spring safety valve, such that the second inlet communicates with the first inlet 8 via the plunger.

In this embodiment, the three-way main valve, the spring safety valve and the electromagnetic pilot valve all adopt rigid sealing structures, and the three-way main valve, the spring safety valve and the electromagnetic pilot valve and the medium contact part are sealed by graphite wound gaskets and silver gaskets, so that the three-way main valve, the spring safety valve and the electromagnetic pilot valve can use water or steam medium suitable for high temperature and high pressure.

In this embodiment, the three-way main valve is disposed below the spring relief valve and the solenoid pilot valve; the first inlet 8 and the first working hole are positioned on one side of the three-way main valve, which is far away from the spring safety valve.

In this embodiment, the solenoid pilot valve is a direct-acting three-way solenoid valve.

In this embodiment, the evacuation flow paths of the side-by-side pilot valves are of throttled design, and each pilot valve can independently control the main valve to complete the switching action.

And throttling assemblies are arranged in the second emptying channel of the spring safety valve corresponding to the second emptying port and the third emptying channel of the electromagnetic pilot valve corresponding to the third emptying port and used for throttling the second emptying port and the third emptying port.

Example two

In this embodiment, a control method of a two-position three-way electromagnetic valve with an overpressure protection function is provided, which includes the following control procedures:

Under the overpressure state, the electromagnetic pilot valve is in a power-off state, and the electromagnetic pilot valve automatically opens the valve to discharge pressure, namely from off to on: the acting force of the medium at the second pilot valve of the spring safety valve is larger than the initial acting force of the bellows assembly and the second spring, the second pilot valve is opened, the second valve rod of the spring safety valve is blocked from a second emptying port formed at the second guide sleeve, and the medium passes through the second working port of the spring safety valve and reaches the piston chamber of the three-way main valve through the third working port of the electromagnetic pilot valve; the acting area of the piston in the piston cavity is larger than the area of the first inlet 8, the medium force generated by the medium pushes the piston and the first valve rod to move, the first inlet 8 of the three-way main valve is communicated with the first working port 13, and the first emptying port is cut off;

After the medium pressure enters a normal pressure state from an overpressure state, the electromagnetic pilot valve is automatically closed, namely, from on to off: the acting force of a medium at the second pilot valve is smaller than the initial acting force of the second bellows assembly and the second spring, the compression action of the second bellows assembly and the second spring enables the second pilot valve and the second valve rod to reset and close the second working port, the piston chamber of the three-way main valve is not supplemented with inlet medium pressure, the pressure is discharged to the three-way main valve after passing through the second emptying port of the spring safety valve and the third emptying port of the electromagnetic pilot valve, the pressure is reduced to the pressure of the first emptying port, the acting force of the piston is close to zero, an inlet valve disc of the three-way main valve drives to close the first inlet 8 under the action of the medium acting force of the first inlet 8, the piston port is opened, the electromagnetic pilot valve is closed, and the third inlet is closed; the third working port is communicated with the third emptying port;

Under the condition that the safety device does not respond normally after the medium is not overpressured or overpressured, the electromagnetic pilot valve can be controlled to be forced to be opened or closed by electrifying and de-electrifying the electromagnetic coil of the electromagnetic pilot valve;

The coil assembly of the solenoid pilot valve is energized and the solenoid pilot valve is turned on by closing: the coil assembly of the electromagnetic pilot valve is excited, the movable iron core assembly pulls the third valve rod and the third valve head to overcome the iron core spring and move upwards away from the third sleeve, and the third valve head opens a third inlet on the third sleeve and closes the upper valve seat; medium directly enters a piston cavity of the three-way main valve from a third inlet of the third sleeve, the acting force of the medium pushes the piston and the first valve rod to move, the first emptying port is closed, the valve is opened, the first inlet 8 of the three-way main valve is communicated with the first working port 13, and the first emptying port is cut off;

The coil assembly of the electromagnetic pilot valve is powered off, and the electromagnetic pilot valve is switched on and off: the coil assembly of the electromagnetic pilot valve is nonmagnetic, the iron core spring resets the movable iron core assembly, the third valve rod and the third valve head, the valve head closes the third inlet of the third sleeve, and the upper valve seat is opened; the piston cavity of the three-way main valve is not supplemented with inlet medium pressure, and is discharged to the rear of the three-way main valve through the second emptying port of the spring safety valve and the second emptying port of the electromagnetic pilot valve, the pressure is reduced to the pressure of the first emptying port, the acting force of the piston is close to zero, the first inlet 8 is closed by the inlet valve disc under the driving of the acting force of the inlet medium, the piston port is opened, the electromagnetic pilot valve is closed, the third inlet is closed, and the third working port is communicated with the third emptying port.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.

Claims (10)

1. A two-position three-way electromagnetic valve with an overpressure protection function is characterized by comprising a three-way main valve, a spring safety valve and an electromagnetic pilot valve;

the spring safety valve and the electromagnetic pilot valve are parallelly used as pilot valves of the three-way main valve;

the three-way main valve is provided with a first inlet, a first working port and a first emptying port;

the spring safety valve is provided with a second inlet, a second working port and a second emptying port;

The electromagnetic pilot valve is provided with a third inlet, a third working port and a third emptying port;

the second inlet is communicated with the first inlet; the second working hole is communicated with a piston cavity of the three-way main valve through the third working hole; the second emptying port is communicated with the first emptying port;

The third inlet is communicated with the first inlet, and the third emptying port is communicated with the first emptying port.

2. The two-position three-way electromagnetic valve with overpressure protection function according to claim 1, wherein the electromagnetic pilot valve is provided with a real-time valve position feedback signal module capable of feeding back the valve position of the electromagnetic pilot valve.

3. The two-position three-way electromagnetic valve with the overpressure protection function according to claim 1, wherein a limiting feedback signal module is arranged at a reference position of the spring safety valve, and can feed back a set take-off state of the spring safety valve and output a dry contact closing signal to indicate that the set pressure take-off can be ensured at a preset take-off installation position.

4. The two-position three-way electromagnetic valve with an overpressure protection function according to claim 1, wherein the electromagnetic pilot valve is a normally closed electromagnetic valve; the third working port is communicated with the third emptying port in a power-off or failure state; and in an overpressure state or an electrified state, the third inlet is communicated with the third working port, and the emptying port is cut off.

5. The two-position three-way electromagnetic valve with an overpressure protection function according to claim 1, characterized in that a plunger is provided at a second inlet of the spring safety valve such that the second inlet communicates with the first inlet through the plunger.

6. The two-position three-way electromagnetic valve with an overpressure protection function according to claim 1, wherein the three-way main valve, the spring safety valve and the electromagnetic pilot valve are all of rigid sealing structures, and the three-way main valve, the spring safety valve and the electromagnetic pilot valve are sealed by graphite wound gaskets and silver gaskets at the contact parts of the electromagnetic pilot valve and a medium, so that the three-way main valve, the spring safety valve and the electromagnetic pilot valve can be used for water or steam mediums suitable for high temperature and high pressure.

7. The two-position three-way electromagnetic valve with an overpressure protection function according to claim 1, wherein the three-way main valve is arranged below the spring safety valve and the electromagnetic pilot valve; the first inlet and the first working hole are positioned at one side of the three-way main valve, which is far away from the spring safety valve.

8. The two-position three-way electromagnetic valve with an overpressure protection function according to claim 1, characterized in that the electromagnetic pilot valve is a direct-acting three-way electromagnetic valve.

9. The two-position three-way electromagnetic valve with overpressure protection function according to claim 1, wherein the emptying flow passage of the parallel pilot valves adopts a throttling design, and each pilot valve can independently control the main valve to complete switching action.

And throttling assemblies are arranged in the second emptying channel of the spring safety valve corresponding to the second emptying port and the third emptying channel of the electromagnetic pilot valve corresponding to the third emptying port and used for throttling the second emptying port and the third emptying port.

10. A control method of a two-position three-way electromagnetic valve with an overpressure protection function based on the two-position three-way electromagnetic valve with the overpressure protection function of any one of claims 1-9; the method is characterized by comprising the following control processes:

Under the overpressure state, the electromagnetic pilot valve is in a power-off state, and the electromagnetic pilot valve automatically opens the valve to discharge pressure, namely from off to on: the acting force of the medium at the second pilot valve of the spring safety valve is larger than the initial acting force of the bellows assembly and the second spring, the second pilot valve is opened, the second valve rod of the spring safety valve is blocked from a second emptying port formed at the second guide sleeve, and the medium passes through the second working port of the spring safety valve and reaches the piston chamber of the three-way main valve through the third working port of the electromagnetic pilot valve; the acting area of the piston in the piston cavity is larger than the area of the first inlet, the medium force generated by the medium pushes the piston and the first valve rod to move, the first inlet of the three-way main valve is communicated with the first working port, and the first emptying port is cut off;

After the medium pressure enters a normal pressure state from an overpressure state, the electromagnetic pilot valve is automatically closed, namely, from on to off: the acting force of a medium at the second pilot valve is smaller than the initial acting force of the second bellows assembly and the second spring, the compression action of the second bellows assembly and the second spring enables the second pilot valve and the second valve rod to reset and close the second working port, the piston chamber of the three-way main valve is not supplemented with inlet medium pressure, the pressure is discharged to the three-way main valve after passing through the second emptying port of the spring safety valve and the third emptying port of the electromagnetic pilot valve, the pressure is reduced to the pressure of the first emptying port, the acting force of the piston is close to zero, the inlet valve disc of the three-way main valve drives to close the first inlet under the action of the first inlet medium acting force, the piston port is opened, the electromagnetic pilot valve is closed, and the third inlet is cut off; the third working port is communicated with the third emptying port;

Under the condition that the safety device does not respond normally after the medium is not overpressured or overpressured, the electromagnetic pilot valve can be controlled to be forced to be opened or closed by electrifying and de-electrifying the electromagnetic coil of the electromagnetic pilot valve;

The coil assembly of the solenoid pilot valve is energized and the solenoid pilot valve is turned on by closing: the coil assembly of the electromagnetic pilot valve is excited, the movable iron core assembly pulls the third valve rod and the third valve head to overcome the iron core spring and move upwards away from the third sleeve, and the third valve head opens a third inlet on the third sleeve and closes the upper valve seat; medium directly enters a piston cavity of the three-way main valve from a third inlet of the third sleeve, the acting force of the medium pushes the piston and the first valve rod to move, the first emptying port is closed, the valve is opened, the first inlet of the three-way main valve is communicated with the first working port, and the first emptying port is cut off;

The coil assembly of the electromagnetic pilot valve is powered off, and the electromagnetic pilot valve is switched on and off: the coil assembly of the electromagnetic pilot valve is nonmagnetic, the iron core spring resets the movable iron core assembly, the third valve rod and the third valve head, the valve head closes the third inlet of the third sleeve, and the upper valve seat is opened; the piston cavity of the three-way main valve is not supplemented with inlet medium pressure, and is discharged to the rear of the three-way main valve through the second emptying port of the spring safety valve and the second emptying port of the electromagnetic pilot valve, the pressure is reduced to the pressure of the first emptying port, the acting force of the piston is close to zero, the first inlet is closed by the inlet valve disc under the driving of the acting force of the inlet medium, the piston port is opened, the electromagnetic pilot valve is closed, the third inlet is closed, and the third working port is communicated with the third emptying port.