CN218177994U - Electric valve - Google Patents

Abstract

The utility model discloses an electric valve, which comprises a valve body assembly and a control mechanism, wherein the control mechanism is used for controlling whether a pressure relief port arranged on the valve body assembly is opened or not so as to control the on-off of a water path in the valve body assembly; the control mechanism comprises a motor, a swinging piece and a movable part used for opening and closing the pressure relief opening, the movable part is movably arranged in the valve body assembly, the motor is arranged in the valve body assembly, the swinging piece is driven by the motor, and the swinging piece is in linkage fit with the movable part to enable the swinging piece to be in linkage with the movable part through swinging to open or close the pressure relief opening. The utility model discloses can slowly open or close the water route, water is less to the impact of valve body assembly.

Description

Electric valve

Technical Field

The present invention relates to a valve, and more particularly to an electric valve.

Background

The pilot-operated solenoid valve in the prior art usually adopts an electromagnet to adsorb an iron core, and the opening and closing of a pressure relief opening are realized, so that the opening and closing of the solenoid valve are realized. However, the electromagnetic valve adopts the mode that the electromagnet adsorbs the iron core to control the switch, and has the following defects:

1. the electromagnet can quickly open and close the water path by adsorption, and the impact on the valve is large;

2. adopt the adsorption mode of electro-magnet, the pressure release end cap needs to contain the part of iron core, and the pressure release end cap needs contact water, leads to the iron core to have rusty risk to lead to the work to become invalid easily.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the technical problem that prior art exists, provide an motorised valve, its mode that adopts motor cooperation swing piece, movable part realizes water route on-off control, has solved the not enough of prior art's solenoid valve adoption electro-magnet control water route break-make.

The utility model provides a technical scheme that its technical problem adopted is: an electrically operated valve comprises a valve body assembly and a control mechanism, wherein the control mechanism is used for controlling whether a pressure relief opening arranged on the valve body assembly is opened or not so as to control the on-off of a water path in the valve body assembly; the control mechanism comprises a motor, a swinging piece and a movable part used for opening and closing the pressure relief opening, the movable part is movably arranged in the valve body assembly, the motor is arranged in the valve body assembly, the swinging piece is driven by the motor, and the swinging piece is in linkage fit with the movable part to enable the swinging piece to be in linkage with the movable part through swinging to open or close the pressure relief opening.

Furthermore, the valve body assembly is provided with a movable cavity communicated with the pressure relief port, the movable part is movably arranged in the movable cavity, and one end of the movable part is positioned outside the movable cavity and movably connected with the swinging part; the moving direction of the movable part is consistent with the axial direction of the pressure relief opening.

Furthermore, the valve body assembly is also provided with a pressure relief channel which is communicated with the movable cavity and a fluid outlet arranged on the valve body assembly.

Furthermore, the movable part comprises a movable rod and a plugging piece for opening and closing the pressure relief opening, the movable rod is movably arranged in the movable cavity, one end of the movable rod forms one end of the movable part, and the other end of the movable rod is provided with the plugging piece; the swinging piece enables the blocking piece to open the pressure relief opening by lifting or pressing down the movable rod, and the movable part further comprises a reset part which is matched between the movable rod and the movable cavity and used for resetting the movable rod so as to enable the blocking piece to close the pressure relief opening.

Furthermore, the swinging piece is provided with a bayonet, the other end of the movable rod is provided with a clamping head, and one end of the movable rod penetrates through the bayonet and is stopped by the clamping head.

Furthermore, the bayonet is U-shaped or C-shaped; the movable rod comprises a screw and a limiting block, the head of the screw forms the clamping head, the limiting block is in threaded connection with the screw, the plugging piece is fixed on the limiting block, the reset component comprises a reset spring, the reset spring is sleeved on the screw, and two ends of the reset spring respectively abut against one end of the movable cavity far away from the pressure relief opening and the limiting block.

Furthermore, the swinging part is a swinging rod, one end of the swinging rod is movably connected with the movable part, and the other end of the swinging rod is fixed on an output shaft of the motor, or the swinging rod is rotatably connected with the valve body assembly; the length direction of the swinging rod is perpendicular to the axial direction of the output shaft of the motor.

Furthermore, the valve body assembly is provided with a fluid inlet, a fluid outlet and the pressure relief opening, a diaphragm component is arranged in an inner cavity of the valve body assembly, the diaphragm component divides the inner cavity of the valve body assembly into a main valve cavity communicated with the fluid inlet and a back pressure cavity communicated with the pressure relief opening, small holes communicated with the main valve cavity and the back pressure cavity are formed in the diaphragm component, and the diaphragm component controls whether the main valve cavity is communicated with the fluid outlet or not according to the water pressure change of the back pressure cavity.

Furthermore, the number of the diaphragm parts is multiple, so that multiple back pressure cavities are formed in the valve body assembly, and the main valve cavities obtained by separating the multiple diaphragm parts in the valve body assembly are the same; the number of the fluid outlets, the number of the pressure relief ports and the number of the control mechanisms are respectively multiple, the pressure relief ports are communicated with the back pressure cavities in a one-to-one correspondence mode, and the movable parts are in one-to-one correspondence with the pressure relief ports; or the number of the diaphragm part, the pressure relief port and the control mechanism is one.

Further, the valve body assembly comprises a valve main body and a fixing frame, wherein the valve main body is provided with the fluid inlet, the fluid outlet, the pressure relief port and the pressure relief channel and is provided with the inner cavity; the fixing frame is fixed outside the valve main body, the fixing frame and the valve main body are surrounded to form a movable cavity which is communicated with the pressure relief opening and used for installing the movable part, and the motor is installed on the fixing frame.

Furthermore, the diaphragm component comprises a diaphragm and a supporting cover, the diaphragm is arranged on the supporting cover, and the peripheral edge of the diaphragm protrudes out of the peripheral edge of the supporting cover and is in a fixed state; the supporting cover is provided with a support column penetrating through the diaphragm, and the support column is of a hollow structure with two through ends so as to form the small hole.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. because the control mechanism comprises a motor, a swinging piece and a movable part for opening and closing the pressure relief port, the movable part is movably arranged on the valve body assembly, the motor is arranged on the valve body assembly, the swinging piece is driven by the motor, and the swinging piece is in linkage fit with the movable part, so that the swinging piece is linked with the movable part through swinging to open or close the pressure relief port, therefore, the control mechanism of the utility model can slowly open or close the water path, and the impact of water on the valve body assembly is small; the movable part is not driven by electromagnetic force, can be made of plastic or stainless steel and the like, has no rusting risk, and can not cause work failure even if rusting.

2. The utility model discloses will the swing of swing turns into the removal of movable part makes the movable part open the stroke great, and it is smooth and easy to go out water.

3. The movable part comprises the movable rod and the plugging piece, and the movable rod is simple in structure and convenient and fast to install.

4. The swinging piece is directly driven by the motor, so that the control mechanism has a simpler and more compact structure, and the occupied space is reduced.

The present invention will be described in further detail with reference to the accompanying drawings and examples; however, the present invention is not limited to the embodiment.

Drawings

Fig. 1 is a schematic perspective view of the first embodiment of the present invention;

FIG. 2 is a cross-sectional view of the first embodiment of the present invention in an initial state;

fig. 3 is a first cross-sectional view of the first embodiment of the present invention in a water-out state;

FIG. 4 is a second cross-sectional view of the first embodiment of the present invention in a water-out state;

FIG. 5 is a sectional view of the first embodiment of the present invention in a water-off state;

FIG. 6 is a schematic perspective view of the second embodiment of the present invention;

FIG. 7 is a sectional view of the second embodiment of the present invention in an initial state;

fig. 8 is a schematic view (cross-sectional view) of the second embodiment of the present invention showing the working state when one of the fluid outlets is discharged;

fig. 9 is a schematic view (cross-sectional view) of the second embodiment of the present invention in an operating state when another fluid outlet is discharged;

fig. 10 is a schematic view (cross-sectional view) of the second embodiment of the present invention showing the working state when water is discharged from both fluid outlets;

the valve comprises a valve body assembly 1, a valve body assembly 11, a valve body 12, a fixed frame 111, a fluid inlet 112, a fluid outlet 113, a pressure relief opening 114, a main valve cavity 115, a back pressure cavity 116, a movable cavity 117, a pressure relief channel 2, a diaphragm component 21, a diaphragm 22, a support cover 221, a small hole 3, a motor 4, a swinging component 41, a bayonet 5, a movable component 51, a movable rod 52, a sealing component 53, a return spring 511, a screw 512 and a limiting block.

Detailed Description

In the description, the directions or positional relationships indicated by "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, and are only for convenience of description of the present invention, but not for indicating or implying that the indicated device must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the scope of the present invention. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate. In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified.

Example one

Referring to fig. 1-5, the electrically operated valve of the present invention includes a valve body assembly 1 and a control mechanism, wherein the valve body 1 has a pressure relief opening 113, and the control mechanism is used to control whether the pressure relief opening 113 of the valve body assembly is opened or not, so as to control the on-off of the water path inside the valve body assembly. Specifically, the valve body assembly 1 is provided with a fluid inlet 111, a fluid outlet 112 and the pressure relief port 113, a diaphragm part 2 is movably arranged in an inner cavity of the valve body assembly 1, the diaphragm part 2 divides the inner cavity of the valve body assembly 1 into a main valve cavity 114 communicated with the fluid inlet 111 and a back pressure cavity 115 communicated with the pressure relief port 113, a small hole 221 (shown in fig. 4) communicating the main valve cavity 114 with the back pressure cavity 115 is arranged on the diaphragm part 2, and the diaphragm part 2 controls whether the main valve cavity 114 is communicated with the fluid outlet 112 according to the water pressure change of the back pressure cavity 115. Control mechanism includes motor 3, swing spare and is used for opening and close the movable part 5 of pressure release mouth 113, movable part 5 movably set up in valve body assembly 1, motor 3 set up in valve body assembly 1, swing spare by motor 3 drives, just swing spare with movable part 5 linkage cooperation makes swing spare is through the swing linkage movable part 5 is opened or is closed pressure release mouth 113. The moving direction of the movable member 5 is the same as the axial direction of the pressure relief port 113.

In this embodiment, the valve body assembly 1 is provided with a movable cavity 116 communicated with the pressure relief port 113, the movable component 5 is movably disposed in the movable cavity 116, and one end of the movable component 5 is located outside the movable cavity 116 and movably connected to the oscillating component. The valve body assembly 1 is further provided with a pressure relief channel 117, and the pressure relief channel 117 communicates the movable chamber 116 with the fluid outlet 112. The opposite end of the movable cavity 116 and the pressure relief opening is in sealing fit with the movable part 5 by adopting a sealing ring, so that fluid cannot flow out from a gap between the movable part 5 and the movable cavity 116.

In this embodiment, the movable component 5 includes a movable rod 51 and a blocking piece 52 for opening and closing the pressure relief opening 113, the movable rod 51 is movably disposed in the movable cavity 116, one end of the movable rod 51 forms one end of the movable component 5, and the other end of the movable rod 51 is disposed on the blocking piece 52. The swinging member makes the blocking member 52 open the pressure relief opening 113 by pulling the movable rod 51, and the movable member 5 further includes a reset member which is fitted between the movable rod 51 and the movable cavity 116 and is used for providing the reset of the movable rod 51 so that the blocking member 52 closes the pressure relief opening 113. In other embodiments, the movable part does not comprise the reset part, and one end of the movable rod is hinged with the swinging piece, so that the swinging piece can drive the movable rod to reciprocate. In other embodiments, the swinging member presses the movable rod 51 to make the blocking member open the pressure relief opening.

In this embodiment. The connection relationship between the movable rod 51 and the movable rod 51 is as follows: the swinging member is provided with a bayonet 41, the bayonet 41 is U-shaped, but not limited thereto, and in other embodiments, the bayonet 41 is C-shaped or the like. The other end of the movable rod 51 is provided with a clamping head, and one end of the movable rod 51 penetrates through the bayonet 41 and is stopped by the clamping head.

In this embodiment, as shown in fig. 2, the movable rod 51 includes a screw 511 and a limit block 512, a head of the screw 511 forms the chuck, the limit block 512 is in threaded connection with the screw 511, the blocking piece 52 is fixed on the limit block 512, the reset component includes a reset spring 53, the reset spring 53 is sleeved on the screw 511, and two ends of the reset spring respectively abut against one end of the movable cavity 116 far away from the pressure relief opening 113 and the limit block 512. The blocking piece 52 is a rubber pad and is clamped at the bottom of the limiting block 512.

In the present embodiment, the swinging member is a swinging rod 4, but is not limited thereto. One end of the swing rod 4 is movably connected with the movable part 5, namely, one end of the swing rod 4 is provided with the bayonet 41. The other end of the swing rod 4 is rotatably connected to the valve body assembly, and an output shaft of the motor 3 is fixedly connected with a rotating shaft of the swing rod 4 in the same shaft mode. In other embodiments, the output shaft of the motor is in transmission connection with the rotating shaft of the swing rod by adopting a transmission assembly. The length direction of the swing rod 4 is perpendicular to the axial direction of the output shaft of the motor 3. The pressure relief opening 113 faces upwards, and when the blocking piece 525 closes the pressure relief opening 113, the swing rod 4 is approximately horizontal.

In this embodiment, the motor 3 is preferably a self-locking motor with a speed reduction mechanism, and it is ensured that the swing rod 4 does not rotate under the conditions of vibration or a magnetic field when the motor is not powered on.

In this embodiment, the diaphragm member 2 includes a diaphragm 21 and a support cover 22, the diaphragm 21 is mounted on the support cover 22, and the peripheral edge of the diaphragm 21 protrudes from the peripheral edge of the support cover 22 and is in a fixed state; the supporting cover 22 is provided with a pillar (not shown) penetrating the membrane 21, and the pillar has a hollow structure with two penetrating ends to form the small hole 221.

In this embodiment, the valve body assembly 1 includes a valve main body 11 and a fixing frame 12, the valve main body 11 is provided with the fluid inlet 111, the fluid outlet 112, the pressure relief port 113 and the pressure relief channel 117, and the inner cavity is formed; the fixed frame 12 is fixed on the top of the valve main body 11, and the fixed frame and the valve main body form the movable cavity 116, the motor 3 is installed on the fixed frame 12, and the swing rod 4 is rotatably connected to the fixed frame 12. The valve body 11 comprises a valve casing and a valve cover which are connected together and enclose the inner cavity, the pressure relief port 113 is arranged on the valve cover, the fluid inlet 111 and the fluid outlet 112 are arranged on the valve casing, the peripheral edge of the diaphragm 21 is pressed on the valve casing by the valve cover, and when the diaphragm 21 is positioned, the peripheral edge of the diaphragm 21 can be used for sealing the gap between the valve cover and the valve casing.

In this embodiment, the number of the diaphragm member 2, the fluid outlet 112, the pressure relief port 113, the movable cavity 116, the pressure relief passage 117, and the control mechanism is one, so that the present invention forms a single water path.

In this embodiment, the blocking piece 52 blocks the pressure relief opening 113 under the spring force of the return spring 53, the diameter of the pressure relief opening 113 is set to be 0.8-1.2 mm, the water pressure area S1 is small, the requirement on the spring force of the return spring 53 is low, the force borne by the blocking piece 52 is small, the service life is long, the spring force is small, and the requirement on the torque of the motor 3 is also small, so that the opening or closing of the pressure relief opening can be controlled by using a small-specification motor.

The utility model discloses an electrically operated valve, its initial state is shown as figure 2: when the motor 3 is not started, the swing rod 4 is in a horizontal state, the movable rod 51 enables the blocking piece 52 at the bottom of the movable rod to block the pressure relief opening under the action of the return spring 53, at the moment, the water pressure of the main valve cavity 114 is equal to that of the back pressure cavity 115, and the cross section area of the back pressure cavity 115 is larger, so that the middle part of the diaphragm part 2 is pressed downwards, the main valve cavity 114 and the fluid outlet 112 are disconnected, and the fluid outlet 112 does not discharge water. When the motor 3 drives the swing rod 4 to rotate clockwise by a preset angle, one end of the swing rod 4 tilts upwards to pull the movable rod 51 upwards, so that the movable rod 51 moves upwards against the action of the return spring 53, and the pressure relief port 113 is opened, water in the back pressure cavity 115 flows out through the pressure relief port 113 and flows to the fluid outlet 112 through the pressure relief channel 117, as shown in fig. 4, so that the water pressure of the back pressure cavity 115 is greatly reduced, at the moment, the water pressure in the main valve cavity 114 is far greater than the water pressure of the back pressure cavity 115, therefore, the middle part of the diaphragm part 2 moves upwards under the pushing of the water pressure of the main valve cavity 114, so that the main valve cavity 114 is communicated with the fluid outlet 112, and the water flows out from the fluid outlet 112, as shown in fig. 3 and 4, a thin arrow in the figure indicates the water flow direction, and a thick arrow indicates the rotation direction of the swing rod. When the motor 3 drives the swing rod 4 to rotate counterclockwise by a preset angle, the swing rod 4 resets to the initial position to release the movable rod 51, the movable rod 51 moves downward under the restoring force of the restoring spring 53, so that the blocking member 525 blocks the pressure relief port 113 again, water in the main valve cavity 114 is gradually supplemented into the back pressure cavity 115 from the small hole 221 in the diaphragm component 2, the water pressure in the back pressure cavity 115 is gradually increased until the water pressure is equal to that of the main valve cavity 114, at this time, the middle part of the diaphragm component 2 is pressed downward due to the large cross-sectional area of the back pressure cavity 115, and the main valve cavity 114 is disconnected from the fluid outlet 112, as shown in fig. 5. In order to quickly return the diaphragm member 2, a spring may be provided in the back pressure chamber 115, and the return of the diaphragm member 2 may be accelerated by the spring.

The utility model discloses an electrically operated valve, it compares with prior art's solenoid valve, can slowly open or close the water route, makes water less to the impact of valve body assembly, just shutoff piece 52 can adopt materials such as plastics or stainless steel, does not have the risk of rusting.

Example two

Referring to fig. 6-10, the difference between the electric valve of the present invention and the first embodiment is: the number of the diaphragm parts 2 is multiple, so that a plurality of back pressure cavities 115 are formed in the valve body assembly 1, and the main valve cavities 114 obtained by separating the plurality of diaphragm parts 2 in the valve body assembly 1 are the same; the number of the fluid outlets 112, the number of the pressure relief ports 113, the number of the movable cavities 116 and the number of the control mechanisms are respectively multiple, the pressure relief ports 13 are communicated with the back pressure cavities 115 in a one-to-one correspondence manner, the fluid outlets 112 are communicated with the diaphragm parts 2 in a one-to-one correspondence manner, the movable parts 5 are communicated with the movable cavities 116 in a one-to-one correspondence manner, and the movable cavities 116 are communicated with the pressure relief ports in a one-to-one correspondence manner.

In this embodiment, the number of the diaphragm member 2, the fluid outlet 112, the pressure relief port 113, the movable cavity 116, the pressure relief channel 117, and the control mechanism is two, but not limited thereto. Therefore, the utility model discloses constitute two water route forms. The two diaphragm parts 2, the two fluid outlets 112, the two pressure relief ports 113, the two movable cavities 116, the two pressure relief channels 117 and the two control mechanisms are respectively distributed left and right.

The utility model discloses an electrically operated valve, its initial state is shown in figure 7: the motors 3 of the two control mechanisms are not started, the swing rods 4 are respectively in a roughly horizontal state, and the movable rods 51 respectively cause the blocking pieces 52 at the bottoms of the movable rods to block the pressure relief openings under the action of the corresponding return springs 53, so that no water flows out from the two fluid outlets 112. When only the left motor 3 is started, the left motor 3 drives the left oscillating bar 4 to rotate clockwise by a preset angle, so that one end of the left oscillating bar 4 tilts upwards to pull up the left movable rod 51, the left movable rod 51 overcomes the action of the return spring 53 to move upwards, so as to open the left pressure relief port 113, the left back pressure chamber 115 performs pressure relief through the left pressure relief port 113 and the pressure relief channel 117, so that the water pressure of the left back pressure chamber 115 is greatly reduced, at the moment, the water pressure in the main valve chamber 114 is far greater than that of the left back pressure chamber 115, therefore, the middle part of the left diaphragm part 2 moves upwards under the pushing of the water pressure of the main valve chamber 114, so as to communicate the main valve chamber 114 with the left fluid outlet 112, water flows out from the left fluid outlet 112, as shown in fig. 8, a thin arrow in the figure indicates the water flow direction, and a thick arrow indicates the rotation direction of the oscillating bar. When only starting the right motor 3, when the right motor 3 drives the right swing rod 4 to rotate counterclockwise for a preset angle, the right movable rod 51 is lifted upwards by tilting one end of the right swing rod 4, the right movable rod 51 is moved upwards by overcoming the effect of the return spring 53, so as to open the right pressure relief port 113, the right back pressure chamber 115 is decompressed through the right pressure relief port 113, so that the water pressure of the right back pressure chamber 115 is greatly reduced, at the moment, the water pressure in the main valve chamber 114 is far greater than the water pressure of the right back pressure chamber 115, therefore, the middle part of the right diaphragm part 2 moves upwards under the pushing of the water pressure of the main valve chamber 114, so as to communicate the main valve chamber 114 with the right fluid outlet 112, water flows out from the right fluid outlet 112, as shown in fig. 9, a thin arrow in the figure indicates the direction of water flow, and a thick arrow indicates the rotation direction of the swing rod.

When the two motors 3 are respectively started, the left motor 3 drives the left swing rod 4 to rotate clockwise by a preset angle, the right motor 3 drives the right swing rod 4 to rotate counterclockwise by a preset angle, so that the two pressure relief ports 113 are respectively opened, water in the two back pressure cavities 115 respectively flows out through the corresponding pressure relief ports 113 and pressure relief channels 117, and the water pressure of the two back pressure cavities 115 is respectively greatly reduced and is smaller than that of the main valve cavity 114, therefore, the middle parts of the two diaphragm parts 2 respectively move upwards under the pushing of the water pressure in the main valve cavity 114, so that the main valve cavity 114 is communicated with the two fluid outlets 112, and the water flows out from the two fluid outlets 112, as shown in fig. 10, the flow direction of a thin arrow in the figure, and the rotation direction of the swing rod is indicated by a thick arrow.

When water is shut off, the motor 3 drives the swing rod 4 to rotate reversely by a preset angle, the swing rod 4 resets to an initial position, the blocking piece 525 blocks the pressure relief opening 113 again, water in the main valve cavity 114 is gradually supplemented into the back pressure cavity 115 from the small hole 221 on the diaphragm component 2, the water pressure in the back pressure cavity 115 is gradually increased until the water pressure is equal to that of the main valve cavity 114, at the moment, the middle part of the diaphragm component 2 is pressed downwards due to the large cross section area of the back pressure cavity 115, and therefore the main valve cavity 114 is disconnected from the fluid outlet 112.

The utility model discloses an electrically operated valve, it all is the same with prior art or can adopt prior art to realize not to relate to the part.

The above embodiments are only used to further illustrate the electric valve of the present invention, but the present invention is not limited to the embodiments, and any simple modification, equivalent change and modification made by the technical entity of the present invention to the above embodiments all fall into the protection scope of the technical solution of the present invention.

Claims (10)

1. An electrically operated valve comprises a valve body assembly and a control mechanism, wherein the control mechanism is used for controlling whether a pressure relief opening arranged on the valve body assembly is opened or not so as to control the on-off of a water path in the valve body assembly; the method is characterized in that: the control mechanism comprises a motor, a swinging piece and a movable part used for opening and closing the pressure relief opening, the movable part is movably arranged in the valve body assembly, the motor is arranged in the valve body assembly, the swinging piece is driven by the motor, and the swinging piece is in linkage fit with the movable part to enable the swinging piece to be in linkage with the movable part through swinging to open or close the pressure relief opening.

2. The electrically operated valve of claim 1, wherein: the valve body assembly is provided with a movable cavity communicated with the pressure relief port, the movable part is movably arranged in the movable cavity, and one end of the movable part is positioned outside the movable cavity and is movably connected with the swinging part; the moving direction of the movable part is consistent with the axial direction of the pressure relief opening.

3. Electrically operated valve according to claim 2, characterized in that: the valve body assembly is also provided with a pressure relief channel which is communicated with the movable cavity and a fluid outlet arranged on the valve body assembly.

4. The electrically operated valve of claim 2, wherein: the movable part comprises a movable rod and a plugging piece for opening and closing the pressure relief opening, the movable rod is movably arranged in the movable cavity, one end of the movable rod forms one end of the movable part, and the other end of the movable rod is provided with the plugging piece; the swinging piece enables the blocking piece to open the pressure relief opening by lifting or pressing down the movable rod, and the movable part further comprises a reset part which is matched between the movable rod and the movable cavity and used for resetting the movable rod so as to enable the blocking piece to close the pressure relief opening.

5. The electrically operated valve of claim 4, wherein: the swing piece is provided with a bayonet, the other end of the movable rod is provided with a clamping head, and one end of the movable rod penetrates through the bayonet and is stopped by the clamping head.

6. Electrically operated valve according to claim 5, characterized in that: the bayonet is U-shaped or C-shaped; the movable rod comprises a screw and a limiting block, the head of the screw forms the clamping head, the limiting block is in threaded connection with the screw, the plugging piece is fixed on the limiting block, the reset component comprises a reset spring, the reset spring is sleeved on the screw, and two ends of the reset spring respectively abut against one end of the movable cavity far away from the pressure relief opening and the limiting block.

7. Electrically operated valve according to claim 1, characterized in that: the swing piece is a swing rod, one end of the swing rod is movably connected with the movable part, and the other end of the swing rod is fixed on an output shaft of the motor, or the swing rod is rotatably connected to the valve body assembly; the length direction of the swinging rod is perpendicular to the axial direction of the output shaft of the motor.

8. Electrically operated valve according to any of claims 1-7, characterized in that: the valve body assembly is provided with a fluid inlet, a fluid outlet and the pressure relief opening, a diaphragm part is arranged in an inner cavity of the valve body assembly, the diaphragm part divides the inner cavity of the valve body assembly into a main valve cavity communicated with the fluid inlet and a back pressure cavity communicated with the pressure relief opening, small holes communicated with the main valve cavity and the back pressure cavity are formed in the diaphragm part, and the diaphragm part controls the main valve cavity to be communicated with the fluid outlet or not according to the water pressure change of the back pressure cavity.

9. The electrically operated valve of claim 8, wherein: the number of the diaphragm parts is multiple, so that a plurality of back pressure cavities are formed in the valve body assembly, and the main valve cavities obtained by separating the diaphragm parts in the valve body assembly are the same; the number of the fluid outlets, the number of the pressure relief ports and the number of the control mechanisms are respectively multiple, the pressure relief ports are communicated with the back pressure cavities in a one-to-one correspondence mode, and the movable parts are in one-to-one correspondence with the pressure relief ports; or the number of the diaphragm part, the pressure relief opening and the control mechanism is respectively one.

10. The electrically operated valve of claim 8, wherein: the valve body assembly comprises a valve main body and a fixing frame, wherein the valve main body is provided with the fluid inlet, the fluid outlet, the pressure relief port and the pressure relief channel and is provided with the inner cavity; the fixed frame is fixed outside the valve main body, a movable cavity which is communicated with the pressure relief opening and used for installing the movable part is formed by the fixed frame and the movable cavity, and the motor is installed on the fixed frame;

the diaphragm component comprises a diaphragm and a supporting cover, the diaphragm is arranged on the supporting cover, and the peripheral edge of the diaphragm protrudes out of the peripheral edge of the supporting cover and is in a fixed state; the supporting cover is provided with a support column penetrating through the diaphragm, and the support column is of a hollow structure with two through ends so as to form the small hole.

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