CN110131467A - A bistable solenoid valve and induction water outlet device - Google Patents

Abstract

The present invention relates to technical field of bathroom equipment, a kind of bistable electromagnetic valve and induction discharging device are disclosed, including valve body and electromagnet, valve body include valve chamber and diaphragm unit, diaphragm unit is set in the valve chamber, for making valve body on and off；Electromagnet includes coil, static iron core, dynamic iron core and the first spring, and the first spring is used to apply the elastic force for being directed toward the diaphragm unit to the dynamic iron core；Coil is set to the periphery of the dynamic iron core, for generating magnetic drive dynamic iron core far from the diaphragm unit or to diaphragm unit movement, the valve body is made to close or be connected；The dynamic iron core end face opposite with static iron core has groove, and groove is internally recessed by the end face of dynamic iron core.The dynamic iron core driving resistance of the bistable electromagnetic valve is smaller, energy consumption is lower, is more energy-saving and environmentally friendly.

Description

A bistable solenoid valve and induction water outlet device

technical field

The invention relates to the technical field of bathroom equipment, in particular to a bistable electromagnetic valve and an induction water outlet device.

Background technique

Induction water outlet devices such as induction faucets and induction flush valves include induction devices for detecting human body signals and solenoid valves for controlling water discharge. The solenoid valves are connected in series in the water outlet channel. The device discharges water, and when the solenoid valve is closed, the water discharge device stops discharging water. The existing induction water outlet device is mainly directly connected to an external power supply (mains), and supplies power to it through the external power supply, so the energy consumption requirement for the solenoid valve is not high. In other induction water outlet devices, in order to facilitate installation and use, the induction water outlet device has a built-in power supply (so there is no need to connect to the mains), and the induction water outlet device is powered by the built-in power supply. However, the existing solenoid valve consumes a lot of energy. As a result, the service life of the built-in power supply is relatively short, requiring frequent replacement or charging of the power supply, resulting in inconvenience in use.

Contents of the invention

Therefore, it is necessary to provide a solenoid valve for reducing the energy consumption of the existing solenoid valve.

To achieve the above object, the inventor provides a bistable solenoid valve, comprising:

The valve body, the valve body includes a valve chamber and a diaphragm assembly, the diaphragm assembly is arranged in the valve chamber, and the diaphragm assembly can move in the valve chamber to make the valve body conduct or close ;

An electromagnet, the electromagnet includes a coil, a static iron core, a moving iron core and a first spring, one end of the moving iron core is opposite to the diaphragm assembly, the other end is opposite to the static iron core, and the first spring Connected with the moving iron core, the first spring is used to apply an elastic force directed to the diaphragm assembly to the moving iron core; the coil is arranged on the outer periphery of the moving iron core for generating magnetic force and driving The moving iron core moves away from the diaphragm assembly or moves toward the diaphragm assembly to close or conduct the valve body; wherein, the end surface of the moving iron core opposite to the static iron core has a groove, The groove is recessed inwardly from the end face of the moving iron core.

Further, it also includes a permanent magnet, the permanent magnet is arranged on the side of the moving iron core, the moving iron core is magnetic, and when the moving iron core is close to the diaphragm assembly, the permanent magnet is used to The moving iron core exerts a magnetic force directed to the diaphragm assembly; when the moving iron core is away from the diaphragm assembly, the permanent magnet is used to apply a magnetic force to the moving iron core along the moving direction of the moving iron core.

Further, the diaphragm assembly includes a diaphragm and a second spring, the second spring is located between the diaphragm and the moving iron core, one end of the second spring is opposite to the diaphragm, and the other end is opposite to the diaphragm. The moving iron cores are opposite to each other.

Further, the valve cavity is formed by connecting the upper valve body and the lower valve body,

A push rod is arranged between the diaphragm assembly and the moving iron core. One end of the push rod passes through the upper valve body and is opposite to the moving iron core, and the other end of the valve body is opposite to the pressure relief hole. The moving iron core closes the pressure relief hole or opens the pressure relief hole through the push rod.

Further, the stroke of the moving iron core is 0.3mm-0.5mm.

Further, the pulse voltage of the electromagnet is 2.7V-4.1V, and the pulse period is 7ms-12ms.

Further, the end surface of the moving iron core opposite to the diaphragm assembly has a groove, the side of the moving iron core has an opening, and the opening communicates with the groove.

Further, the magnetic flux density of the electromagnet is 2700GTS-3300GTS, and the resistance of the coil is 13Ω-17Ω.

In order to solve the above technical problems, the present invention also provides another technical solution:

An induction water outlet device, comprising: a water outlet channel and a solenoid valve, the solenoid valve is a bistable solenoid valve described in any of the above technical solutions, the solenoid valve is connected in series with the water outlet channel, and is used to control the water outlet of the water outlet channel .

Further, the water outlet channel includes a water inlet, a water outlet, and a water delivery channel connecting the water inlet and the water outlet, at least part of the water delivery channel surrounds the outside of the solenoid valve or is arranged along the side of the solenoid valve. Divide into two or more branches.

Different from the prior art, the above-mentioned technical solution sets a groove on the end face of the moving iron core of the bistable solenoid valve facing the static iron core, and the groove is located at the contact part between the moving iron core and the static iron core, reducing the pressure of the moving iron core. The contact area of the end face also reduces the surface tension of the liquid attached to the end face of the moving iron core, so the moving iron core can be driven away from the diaphragm assembly with a smaller driving force, thereby reducing the energy consumption of the bistable electromagnet , making it more energy efficient.

Description of drawings

Fig. 1 is the schematic diagram of the three-dimensional structure of the bistable electromagnetic valve described in the specific embodiment;

Fig. 2 is a sectional view of the bistable solenoid valve along A-A in Fig. 1;

Fig. 3 is the explosion diagram of the bistable electromagnetic valve described in the specific embodiment;

Fig. 4a is an exploded view of the electromagnet and the moving iron core described in the specific embodiment;

Fig. 4b is a schematic structural view of the diaphragm, the second spring and the upper cavity in the specific embodiment;

5 is a schematic diagram of the positional relationship between the moving iron core, the permanent magnet and the coil described in the specific embodiment;

Fig. 6 is a schematic diagram of cooperation between the moving iron core and the push rod assembly described in the specific embodiment;

Fig. 7 is a schematic diagram of the three-dimensional structure of the lower valve body described in the specific embodiment;

Fig. 8 is a schematic diagram of the three-dimensional structure of the induction water outlet device described in the specific embodiment;

Fig. 9 is a sectional view along B-B direction in Fig. 8;

Explanation of reference signs:

100. Water outlet device housing;

101 water inlet;

102. Water outlet;

103. Water delivery channel;

11. Shell cover;

12. Shell main body;

13. Connector;

14. The water inlet of the valve body;

141. filter screen;

15. Water outlet of the valve body;

21. Solenoid valve;

211, static iron core;

212, coil support;

213. Coil;

22. Moving iron core;

221, groove;

222. Push rod assembly;

223. opening;

224. channel;

23. The first spring;

24. Permanent magnet;

3. Diaphragm components;

31. The second spring;

311, guide pin;

32. Diaphragm;

321, diversion hole;

4. Valve body;

41. Upper valve body;

42. Lower valve body;

43. Isolation cavity;

431. Pressure relief hole;

51. Sealing ring;

52. Sealing ring;

53. Sealing ring;

200. Bistable solenoid valve;

Detailed ways

In order to explain in detail the technical content, structural features, achieved goals and effects of the technical solution, the following will be described in detail in conjunction with specific embodiments and accompanying drawings.

Please refer to Figures 1 to 7, this embodiment provides a bistable solenoid valve, wherein the bistable solenoid valve can control the state switching of the valve body through a pulse signal, that is, control the valve body to be turned on or off through a pulse signal State switching, wherein, the conduction of the valve body is also called opening the valve, and the closing of the valve body is also called closing the valve. The bistable solenoid valve can stabilize the valve body after the pulse signal (that is, after the magnetic force of the solenoid valve coil disappears). In the current state (that is, the valve is open or the valve is closed), it is called a bistable solenoid valve.

As shown in FIG. 1 , it is a schematic structural diagram of a bistable solenoid valve according to a specific embodiment. The bistable solenoid valve includes a casing, wherein the casing includes an upper casing 11 and a casing body 12, and the upper casing 11 and the casing body 12 cooperate to form a hollow cavity structure. The bistable solenoid valve also includes a connector 13, The connector 13 is used for connecting a control signal, that is, a pulse signal, so as to control the switching state of the bistable solenoid valve.

As shown in Figure 2 and Figure 3, Figure 2 is a sectional view of the bistable solenoid valve along the direction A-A in Figure 1, and Figure 3 is an exploded view of the bistable solenoid valve. The bistable solenoid valve includes an electromagnet 21 and a valve body 4 arranged in the casing. Wherein, the valve body 4 comprises an upper valve body 41 and a lower valve body 42, the upper valve body 41 has an upper valve cavity, the lower valve body 42 has a lower valve cavity, the upper valve body 41 and the lower valve body 42 are connected to each other, so that the upper valve body The valve cavity is connected with the lower valve cavity to form a valve cavity. A sealing ring 52 is arranged between the upper valve body 41 and the electromagnet 21 , and a diaphragm assembly 3 is arranged in the valve chamber, and the diaphragm assembly 3 can move in the valve chamber to make the valve body conduct or close.

The electromagnet 21 includes a coil 213, a moving iron core 22 and a first spring 23. The coil 213 is wound around the periphery of the coil support 212. A cavity is provided inside the coil support 212. The moving iron core 22 is arranged in the cavity and can be moved along the cavity. The cavity moves closer to the diaphragm assembly 3 or away from the diaphragm assembly 3 . A sealing ring 53 is arranged between the moving iron core 22 and the upper valve body 41, a static iron core 211 is arranged on the coil support 212, and the static iron core 211 is located at an end of the coil support away from the moving iron core 22, wherein the static iron core 211 The end far away from the moving iron core 22 can be provided with an adjusting bolt, the position of the static iron core 211 can be adjusted by the bolt, a sealing ring 51 is arranged on the static iron core 211, and one end of the first spring 23 is connected with the moving iron core 22, The other end of the first spring 23 is connected to the static iron core 211 , and the first spring 23 is used to apply an elastic force directed to the diaphragm assembly 3 to the moving iron core 22 . The coil 21 generates a magnetic field when the pulse signal is input, and drives the moving iron core 22 to move close to the diaphragm assembly 3 or away from the diaphragm assembly 3 .

As shown in Figure 2, Figure 3, Figure 4a and Figure 4b, the diaphragm assembly 3 includes a diaphragm 32 and a second spring 31, wherein the edge of the diaphragm 32 is fixed between the upper valve body 41 and the lower valve body 42 Between, the second spring 31 is arranged between the moving iron core 22 and the diaphragm 32 . The solenoid valve can be a pilot-operated solenoid valve, an isolation cavity 43 is formed between the diaphragm 32 and the upper valve body 41, the diaphragm 32 is provided with a diversion hole 321, and the diversion hole 321 communicates with the water inlet 14 of the valve body, and the water flow can be Enter the isolation chamber 43 through the diversion hole 321, the top of the isolation chamber 43 is provided with a pressure relief hole 431, the pressure relief hole 431 is opposite to the end of the moving iron core, when the pressure relief hole 431 is closed, the water margin enters the isolation chamber through the diversion hole 321 cavity 43, and the water pressure in the isolation cavity 43 rises (equal to the water pressure at the water inlet), thereby driving the diaphragm 32 to move downward through the water pressure, so that the valve body is closed; when the pressure relief hole 431 is opened, the isolation cavity The water flow in 43 is discharged through the pressure relief hole 431 (the discharged water flow flows to the valve body water outlet 15), thereby reducing the water pressure in the isolation chamber 43, and the diaphragm 32 moves up to make the valve body conduct.

Specifically, the end of the moving iron core 22 facing the diaphragm assembly 3 is provided with a push rod assembly 222, the push rod assembly 222 is located between the diaphragm assembly 3 and the moving iron core 22, and the pressure relief hole 431 of the isolation cavity 43 is controlled by the push rod Component 222 controls closing or conduction. The push rod of push rod assembly 222 passes through the top of upper valve body 41 and enters the upper valve cavity. One end of second spring 31 is opposite to the push rod, and the other end of second spring 31 is connected to the diaphragm. 32 connections. When the push rod assembly 222 moves downward under the thrust of the moving iron core 22, the pressure relief hole 431 will be plugged, and the diaphragm 32 will move down, thereby closing the valve body. Conversely, when the push rod assembly moves upward, the pressure will be released. The hole 431 is connected, and the diaphragm 32 moves up, so that the valve body is connected.

As shown in Figure 2, as shown in Figure 4b, the end of the second spring 31 is provided with a guide pin 311, the outer diameter of the guide pin 311 is slightly smaller than the diversion hole 321, the guide pin 311 passes through the diversion hole 321, when the membrane When the sheet 32 moves up and down, the guide pin 311 moves relative to the diversion hole 321 , so that the diversion hole 321 can be self-cleaned and the diversion hole 321 can be prevented from being blocked by scale.

As shown in Figure 4a, Figure 5 and Figure 6, the moving iron core 22 has a groove 221 on the opposite end surface away from the diaphragm assembly 3, the groove 221 is located at the contact portion between the moving iron core and the static iron core, and the groove 221 is formed by The end surface of the iron core 22 is recessed inward, thereby reducing the contact area between the end surface of the moving iron core 22 and the static iron core 211 . The bistable solenoid valve is often connected to water outlet devices such as faucets, and water or other liquids are often attached to the end face of the moving iron core 22. Since the end face of the moving iron core 22 is provided with a groove 221, the size of the moving iron core is reduced. The surface tension of the liquid attached to the end surface of 22, so the coil 213 can drive the moving iron core away from the static iron core with a smaller driving force, thereby reducing the energy consumption of the electromagnet.

As shown in Figure 7, it is a schematic structural view of the lower valve body 42, referring to Figure 2 and Figure 7, the valve body water inlet 14 is located at the bottom periphery of the lower valve body 42, and the valve body water outlet 15 is located at the center of the bottom of the lower valve body 42 , as shown in FIG. 3 , a sealing ring 54 is provided outside the water outlet 15 . In order to filter the water quality, a filter screen 141 is also provided at the water inlet 14 of the valve body, and the filter screen 141 can be selected from steel wire gauze.

As shown in FIG. 4 a and FIG. 5 , in one embodiment, the moving iron core 22 is magnetic, and a permanent magnet 24 is also arranged on the side of the moving iron core. The permanent magnet 24 is used to apply a magnetic force along the moving direction of the moving iron core 22 to the moving iron core 22. The moving iron core moves along the moving iron core under the elastic force provided by the first spring 23, the magnetic force provided by the permanent magnet 24 and the magnetic force generated by the coil. The direction of the axis of the core 22 goes, thereby driving the diaphragm assembly 3 to move in the valve cavity to make the valve body conduct or close.

When the moving iron core 22 is in the suction state (at this time, the valve body conduction is also called opening the valve), that is, when the moving iron core 22 is close to the static iron core 221 and away from the diaphragm assembly 3, the magnetic force provided by the permanent magnet 24 points to the static iron core 221 and larger than the spring of the first spring 23, so that the moving iron core 22 is stable in the suction state. At this time, a pulse signal is input to the coil 213 to cause the coil 213 to generate a magnetic field, and the magnetic field generated by the coil 213 applies a magnetic force directed to the diaphragm assembly 3 to the moving iron core 22, and this magnetic force is superimposed with the elastic force of the first spring 23 and is greater than that of the permanent magnet 24. The magnetic force drives the moving iron core 22 to move toward the diaphragm assembly 3, thereby making the push rod assembly close the pressure relief hole 431, and causing the diaphragm 32 to move down to close the valve body. In the process that the moving iron core 22 moves to the diaphragm assembly 3, the positional relationship between the moving iron core 22 and the permanent magnet 24 changes, thereby making the magnetic force direction of the permanent magnet 24 to the moving iron core 22 change (become pointing to the diaphragm Component 3 direction), the moving iron core 22 remains separated under the elastic force of the first spring 23 and the magnetic force of the permanent magnet 24 (at this time, the closing of the valve body is also called closing the valve), that is, the moving iron core 22 is separated from the static iron core 221 And compress the diaphragm assembly 3 . When the moving iron core 22 is switched from the separation state to the pull-in state, the coil 213 produces an opposite magnetic force, which is greater than the magnetic force of the first spring 23 and the permanent magnet 24, thereby driving the moving iron core 22 to move toward the static iron core 221. This process is similar to the switching from the above-mentioned engaging state to the separating state, and will not be repeated here.

Preferably, the permanent magnet 24 is located at the suction balance point of the moving iron core 22, wherein the suction balance point is the force balance point of the moving iron core 22, and is also the switching point of the force direction of the moving iron core 22. When the moving iron core 22 When at the suction balance point, the force on the moving iron core 22 is zero. The suction balance point can be positioned at the moving iron core 22 and moves to the middle of the moving path. When the moving iron core 22 moves to the suction balance point, the magnetic force of the permanent magnet 24 to the moving iron core 22 is zero, and when the moving iron 22 moves beyond this When the suction balance point is close to the static iron core 221, the permanent magnet 24 points to the static iron core 221 to the moving iron core 22, and the magnetic force of the permanent magnet 24 to the moving iron core 22 is greater than the magnetic force of the first spring, so that the moving iron core Stay close to the static iron core 211 state (that is, compress the first spring state); when the moving iron core 22 moves beyond this position and is close to the diaphragm assembly 3, the permanent magnet 24 points to the diaphragm assembly 3 of the moving iron core 22, thereby Keep the moving iron core in the state of pressing the diaphragm assembly 3.

As shown in Figure 6, in one embodiment, in order to further reduce the surface tension of the liquid when the moving iron core 22 is away from the static iron core, an opening 223 is provided on the side of the moving iron core 22, and the opening 223 passes through the channel 224 communicates with the groove 221 located on the end surface of the moving iron core 22 , wherein the channel 224 can be located inside the moving iron core 22 and communicates with the opening at one end and communicates with the groove 221 at the other end. When the moving iron core moves toward the diaphragm under the magnetic force of the coil 213, the airflow on the side of the moving iron core 22 will pass The opening 223 and the channel 224 enter the groove 221, thereby reducing the surface tension of the liquid attached to the end surface of the moving iron core 22, so that the magnetic force of the coil driving the moving iron core 22 can be smaller, so the function of the electromagnet can be lowered.

In one embodiment, the stroke of the moving iron core is 0.3-0.5mm, which is smaller than the stroke of the moving iron core in the existing bistable solenoid valve. The reduction of the stroke of the moving iron core can make the volume of the solenoid valve smaller, and can reduce the driving force of the coil 213 on the moving iron core 22, so that the energy consumption of the coil 213 is lower.

Since the end face of the moving iron core 22 is provided with a groove 221, the resistance of the liquid tension attached to the end face of the moving iron core 22 to the movement of the moving iron core is reduced, and the stroke of the moving iron core is reduced, so that the use of the coil 213 is smaller. The magnetic force can drive the iron core 22 to move. Therefore, the magnitude and cycle (ie duration) of the pulse voltage of the coil 213 are smaller than the pulse voltage of the existing solenoid valve, thereby making it more energy-saving and lower energy consumption. Specifically, in one embodiment, the resistance value of the coil 213 in the bistable solenoid valve is 13Ω～17Ω, the pulse voltage of the coil 213 is 2.7V～4.1V, and the pulse period (duration) is 7ms～12ms, The magnetic flux density of the magnetic field generated when the coil 213 in the electromagnet is energized is 2700GTS-3300GTS, and the permanent magnet 24 is a powerful NdFeB magnet with a high temperature resistance of 120°C (the temperature resistance of a conventional magnet is 80°C). Because this solenoid valve can be used in normal temperature water and high temperature water, the temperature resistance of conventional magnets is only about 80°C, and it is easy to lose magnetism under high temperature conditions. The magnet 24 is still magnetic in a high temperature state. The pulse voltage of the existing bistable solenoid valve is between 4.4V～6.6V, and the pulse period is above 25ms. In this embodiment, the pulse voltage and pulse period of the coil 213 are smaller than the pulse of the existing bistable solenoid valve. Voltage and pulse period, so its energy consumption is also lower.

As shown in Fig. 8 and Fig. 9, another embodiment provides an induction water outlet device, which can control the water outlet according to the detected induction signal, specifically, it can be a water outlet device such as an induction faucet and an induction flusher. The induction water outlet device includes a water outlet device housing 100 and a bistable solenoid valve 200 disposed in the water outlet device housing 100, wherein the bistable solenoid valve 200 is the bistable solenoid valve described in any of the above embodiments. valve. The bistable solenoid valve 200 is used to control the water outlet of the water outlet device. Specifically, the water outlet device housing 100 includes a water inlet 101 and a water outlet 102. The water outlet device housing 100 is provided with a water delivery channel 103, a water inlet 101 and a water outlet. A water delivery channel 103 is connected between 102, and the bistable solenoid valve 200 is connected in series in the water delivery channel 103, so by controlling the bistable solenoid valve 200, the induction water outlet device can be controlled to discharge water. The housing 100 of the induction water outlet device is also provided with a sensing window 104, and an induction device is arranged in the induction window 104. The induction device can be an infrared sensor for detecting human body signals, especially infrared signals of hands. The signal detected by the device controls the state of the bistable solenoid valve 200 to switch, thereby controlling or stopping the water discharge.

Preferably, the induction water outlet device has a built-in battery, and the battery supplies power to the induction water outlet device, so it does not need to be connected to an external power source during use, which is convenient for installation. Since the bistable electromagnetic valve 200 is more energy-saving and power-saving than the existing electromagnetic valve, the service life of the built-in battery of the induction water outlet device is longer, and there is no need to frequently charge or replace the battery.

As shown in Figure 9, in one embodiment, the bistable solenoid valve 200 is located inside the casing 100 of the induction water outlet device, the length direction of the bistable solenoid valve 200 is in the same direction as the length direction of the induction water outlet device, and at least part of the water delivery The channel 103 surrounds the outer side of the bistable solenoid valve 200 . Specifically, as shown in Figure 9, the water delivery channel 103 close to the water inlet 101 is branched into two branches at one end of the bistable solenoid valve 200, and the two branches are along the outside of the bistable solenoid valve 200 to the water outlet. 102 direction, and confluence connection to the valve body water inlet 14 of the bistable solenoid valve 200, the valve body water outlet 15 of the bistable solenoid valve 200 communicates with the water outlet 15 of the induction water outlet device, thereby connecting the bistable solenoid valve 200 is connected in series with the water delivery channel 103. In another embodiment, the water delivery channel 103 may surround the outside of the bistable solenoid valve 200 , that is, the water delivery channel 103 is connected 360° around the outside of the bistable solenoid valve 200 to form a whole. In the above embodiment, the bistable solenoid valve 200 is located inside the housing 100 of the induction water outlet device, and the water delivery channel 103 is arranged along the outside of the bistable solenoid valve 200, thereby greatly reducing the volume of the induction water outlet device. Therefore, the induction water outlet device is particularly suitable for connecting with a mechanical faucet, that is, the water inlet 101 of the induction water outlet device is directly connected to the mechanical faucet. Since the induction water outlet device has the function of inductive water outlet, the sensory mechanical faucet can be connected without replacing the faucet. Upgrade to a sensor faucet.

It should be noted that although the foregoing embodiments have been described herein, the scope of protection of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, the changes and modifications made to the embodiments described herein, or the equivalent structure or equivalent process conversion made by using the description of the present invention and the contents of the accompanying drawings, directly or indirectly apply the above technical solutions In other related technical fields, all are included in the patent protection scope of the present invention.

Claims (10)

1. a kind of bistable electromagnetic valve characterized by comprising

Valve body, the valve body include valve chamber and diaphragm unit, and the diaphragm unit is set in the valve chamber, the diaphragm unit Can move in the valve chamber makes the valve body on and off；

Electromagnet, the electromagnet include coil, static iron core, dynamic iron core and the first spring, one end of the dynamic iron core with it is described Diaphragm unit is opposite, and the other end is opposite with static iron core, and first spring is connect with the dynamic iron core, and first spring is used for Apply the elastic force for being directed toward the diaphragm unit to the dynamic iron core；The coil is set to the periphery of the dynamic iron core, for producing Magnetisation power drives the dynamic iron core mobile far from the diaphragm unit or to the diaphragm unit, the valve body is made to close or lead It is logical；Wherein, the dynamic iron core end face opposite with the static iron core have groove, the groove by dynamic iron core end face internally Recess.

2. bistable electromagnetic valve according to claim 1, which is characterized in that it further include permanent magnet, the permanent magnet setting In the side of the dynamic iron core, the dynamic iron core has magnetism, when the dynamic iron core is close to the diaphragm unit, the permanent magnet For applying the magnetic force for being directed toward the diaphragm unit to the dynamic iron core；It is described when the dynamic iron core is far from the diaphragm unit Permanent magnet is used to apply the magnetic force along dynamic iron core moving direction to the dynamic iron core.

3. bistable electromagnetic valve according to claim 1, which is characterized in that the diaphragm unit includes diaphragm and the second bullet Spring, for the second spring between the diaphragm and the dynamic iron core, one end of second spring is opposite with the diaphragm, another It holds opposite with the dynamic iron core.

4. bistable electromagnetic valve according to claim 1, which is characterized in that the valve chamber is connected by upper valve body with lower valve body It is formed,

Push rod is provided between the diaphragm unit and the dynamic iron core, the push rod passes through described upper valve body one end and moves with described Iron core is opposite, and the other end is opposite with the relief hole of valve body, and the dynamic iron core closes the relief hole or unlatching by the push rod Relief hole.

5. bistable electromagnetic valve according to claim 1, which is characterized in that the stroke of the dynamic iron core be 0.3mm~ 0.5mm。

6. bistable electromagnetic valve according to claim 1, which is characterized in that the pulse voltage of the electromagnet be 2.7V~ 4.1V, pulse period are 7ms~12ms.

7. bistable electromagnetic valve according to claim 1, which is characterized in that the dynamic iron core is opposite with the diaphragm unit End face there is groove, the side of the dynamic iron core has opening, and the opening is connected to the groove.

8. bistable electromagnetic valve according to claim 1, which is characterized in that the magnetic flux density of the electromagnet is 2700GTS~3300GTS, the resistance value of the coil are the Ω of 13 Ω~17.

9. a kind of induction discharging device characterized by comprising exhalant canal and solenoid valve, the solenoid valve are claim Any bistable electromagnetic valve of 1-8, the solenoid valve are series at exhalant canal, for controlling the exhalant canal water outlet.

10. induction discharging device according to claim 9, which is characterized in that the exhalant canal includes water inlet, water outlet The water transport channel of mouth and the connection water inlet and the water outlet, at least partly described water transport channel surround the solenoid valve Outside setting or be divided into more than two branches on the outside of the solenoid valve.