WO2023026713A1

WO2023026713A1 - Electromagnetic valve and working fluid control device using electromagnetic valve

Info

Publication number: WO2023026713A1
Application number: PCT/JP2022/027403
Authority: WO
Inventors: 史聖兼子; 正菅野; 昌弘久田
Original assignee: 浜名湖電装株式会社
Priority date: 2021-08-25
Filing date: 2022-07-12
Publication date: 2023-03-02
Also published as: JP2023031735A

Abstract

According to the present invention, a valve element (214) has provided therein a pressure release passage (232) for connecting an outflow passage and an inflow passage. In the valve element, a pressure release valve (233) for opening/closing the pressure release passage is disposed. The pressure release valve (233) opens the pressure release passage when the pressure of a working fluid in the outflow passage is higher, by a pressure difference equal to or greater than release pressure, than the pressure of a working fluid in the inflow passage. Even when the working fluid in the outflow passage is confined by a normally closed valve seat (229), the working fluid can be released to the inflow passage side. Thus, there is no need to particularly form the pressure release passage (232) in a valve body. The electromagnetic valve can be miniaturized compared with a case where a pressure release passage is formed in the valve body.

Description

Solenoid valve and working fluid control device using the solenoid valve

Cross-reference to related applications

This application is based on Patent Application No. 2021-137408 filed in Japan on August 25, 2021, and the content of the underlying application is incorporated by reference in its entirety.

The present disclosure relates to a solenoid valve that opens and closes a working fluid channel and a working fluid control device using the solenoid valve, and is suitable for use in controlling the washer fluid channel, for example.

Patent Document 1 discloses a technique that uses an electromagnetic valve to switch the flow path of the washer fluid so that it flows to the windshield when the electromagnetic valve is not energized, and flows to the rear camera when the electromagnetic valve is energized.

Although not disclosed in Patent Document 1, as shown in FIG. 1, a stop valve 101 that opens at a constant pressure may be used in front of the nozzle 100 that ejects the washer fluid. This is because the stop valve 101 confines the washer fluid in the pipe 102 and improves responsiveness during the next operation. In FIG. 1, 110 is a washer fluid tank, 120 is a pump for discharging the washer fluid at high pressure, and 200 is an electromagnetic valve.

A case is assumed in which an electromagnetic valve as shown in Patent Document 1 is used in a pipe 102 provided with a stop valve 101 as shown in FIG. In this case, the washer fluid in the pipe (hereinafter normally closed pipe 102 a ) that is closed when the solenoid valve 200 is not energized is confined between the solenoid valve and the stop valve 101 .

Therefore, when the temperature of the pipe 102 rises, the air and the washer fluid inside the normally closed pipe 102a expand and the internal pressure rises. The electromagnetic valve disclosed in Patent Document 1 has a normally closed pipe connected to the rear camera. Therefore, there is a concern that the stop valve 101 will open and the washer fluid will drip onto the rear camera if the internal pressure rises above the set release pressure of the stop valve 101 .

On the other hand, Patent Document 2 describes a configuration in which a pressure relief passage is formed in the valve body, and a pressure relief valve opens the pressure relief passage when the pressure of the working fluid is higher than a predetermined differential pressure. However, Patent Document 2 is an expansion valve used in an air conditioner for decompressing and expanding a refrigerant, and is used in a closed refrigeration cycle.

JP 2014-66309 A Japanese Patent Application Laid-Open No. 2006-10228

The present disclosure is a normally closed valve that is used in an originally open flow path, and is used together with a stop valve or the like to prevent unintended outflow of the working fluid even if the pressure of the working fluid increases in the pipe. is the subject.

The first aspect of the present disclosure is a coil that is excited when energized, a stator core that is arranged in a magnetic circuit of the coil, a plunger that is arranged in the magnetic circuit of the coil so as to face the stator core with a magnetic gap interposed therebetween, and the plunger. and a normally closed compression spring that presses the valve body toward the normally closed valve seat. It also includes a valve body having an inflow passage for the working fluid, an outflow passage for the working fluid, and a normally closed valve seat formed between the inflow passage and the outflow passage and against which the valve body abuts. A solenoid valve in which the valve body is moved by the coil excitation force when the coil is energized. When the coil is not energized, the normally closed valve seat is closed by the valve body.

In the first aspect of the present disclosure, the valve body internally forms a pressure relief passage that connects the outflow passage and the inflow passage, and a pressure relief valve that opens and closes this pressure relief passage is arranged in the pressure relief passage in the valve body. The pressure relief valve closes the pressure relief passage when the pressure of the working fluid in the outflow passage is less than, equal to, and higher than the pressure of the working fluid in the inflow passage by a pressure difference less than a predetermined relief pressure. ing. The pressure relief valve opens the pressure relief passage when the pressure of the working fluid in the outflow passage is higher than the pressure of the working fluid in the inflow passage by a pressure differential greater than or equal to the relief pressure.

In the first aspect of the present disclosure, since the pressure relief passage is provided, even if the working fluid in the outflow passage is confined by the normally closed valve seat, if the pressure difference is greater than the relief pressure, the working fluid is released to the inflow passage side. can escape. In particular, since a pressure relief passage is formed inside the valve body, and a pressure relief valve for opening and closing this pressure relief passage is also arranged in the pressure relief passage in the valve body, it is possible to promote miniaturization of the solenoid valve. is made of. That is, there is no need to form a special pressure relief passage in the valve body, and the size of the solenoid valve can be reduced compared to the case where the pressure relief passage is specially formed in the valve body.

In the second aspect of the present disclosure, the valve body comprises a valve body having an inner pressure relief passage and an outer portion seated on a normally closed valve seat, and a cylindrical valve guide having an inner pressure relief passage. there is A pressure relief valve is slidably disposed within the valve guide. Since the pressure relief valve is slidably guided inside the valve guide, the movement of the pressure relief valve is stabilized.

In the third aspect of the present disclosure, a pressure relief valve seat on which the pressure relief valve is seated is formed around the pressure relief passage inside the valve body. The pressure relief valve can open and close the pressure relief passage by contacting and separating from the pressure relief valve seat.

A fourth aspect of the present disclosure includes a pressure relief spring that biases the pressure relief valve against the pressure relief valve seat. By providing the pressure relief spring, the behavior of the pressure relief valve can be stabilized.

A fifth aspect of the present disclosure further includes a normally open compression spring that biases the valve body in a direction away from the normally closed valve seat when the coil is energized. This normally open compression spring is located on the outer periphery of the valve guide. One end of the normally open compression spring is engaged with the valve body and the other end is engaged with the valve guide. By providing the normally open compression spring, it is possible to stabilize the behavior of the valve disc when it is separated from the normally closed valve seat.

A sixth aspect of the present disclosure is that the valve main body and the valve guide are coupled by engaging a locking claw formed on the valve main body with a locking window formed on the valve guide. The valve main body and the valve guide can be connected by snap-fitting, which facilitates assembly of the valve main body and the valve guide.

The seventh aspect of the present disclosure is a working fluid control device using an electromagnetic valve. That is, the solenoid valve includes a working fluid tank, a pump that draws the working fluid from the tank and discharges the high-pressure working fluid, a pipe through which the working fluid from the pump flows, and a It is used with a stop valve that opens the line when the pressure of the working fluid is above the release pressure and closes the line when it is below the release pressure. Moreover, the solenoid valve is arranged between the pump and the stop valve in the pipe.

The release pressure of the pressure relief valve of the solenoid valve is set to be smaller than the release pressure of the stop valve. In the seventh control device of the present disclosure, the pressure of the working fluid in the pipe can always be kept below the release pressure, and the working fluid can be prevented from leaking out of the stop valve in an unintended state.

It is a figure explaining the piping structure of an electromagnetic valve. FIG. 2 is a cross-sectional view of a solenoid valve used in the piping configuration of FIG. 1; FIG. 3 is a partial enlarged view of a valve main body and a valve guide portion of the electromagnetic valve shown in FIG. 2; FIG. 11 is a cross-sectional view showing another assembly example of the valve main body and the valve guide;

The embodiment of the present disclosure is a working fluid control device in which a pipe 102 is arranged as shown in FIG. The nozzle 100 of the normally closed pipe 102a faces the camera 131 and jets the washer fluid to the camera 131. As shown in FIG. The term "control device for working fluid" may also be called "fluid control mechanism", "fluid adjustment unit", or "fluid passage unit".

In the example of FIG. 1, normally closed pipes 102a are used in a plurality (four) of working fluid control devices. A plurality of cameras 131 are provided to monitor the surroundings of the vehicle. Therefore, this is a case in which there are a plurality of cameras 131 to be cleaned with the washer liquid. Further, the nozzle of the normally open pipe 102b is designed to jet the washer fluid toward the rear window glass 130. As shown in FIG.

In the example of FIG. 1, one pipe 102 is a normally open pipe 102b so that the washer fluid always flows to the nozzle 100 facing the rear window glass 130 when the pump 120 is in operation. However, when it is not necessary to wash the rear window glass 130 frequently, the normally open pipe 102b may be eliminated and the normally closed pipe 102a may be used.

Conversely, if it is desired to wash a plurality of cameras 131 all the time, a plurality of normally open pipes 102b may be provided and directed toward the cameras 131. In FIG. 1, four normally closed pipes 102a are used to clean four cameras, but this number increases or decreases according to the number of cameras 131 that need to be cleaned. When the number of cameras 131 to be cleaned is one, it is also possible to use one camera.

As shown in FIG. 2, the solenoid valve 200 has a coil 205 made of enamel-coated copper wire wound many times around a coil bobbin 204 made of resin such as PPS (polyphenylene sulfide resin). A stator core 211 is arranged on the inner circumference of the coil bobbin 204 . The stator core 211 is made of a magnetic material such as SUS430.

In addition, the outer periphery of the coil bobbin 204 is covered with an outer shell 220 made of resin such as PPS (polyphenylene sulfide resin). The shell 220 is integrally formed with the connector 202 . A pair of terminals 221 are embedded in the connector 202 and connected to the positive and negative sides of the coil 205, respectively.

A stator core 211 arranged inside the coil bobbin 204 has a cylindrical shape with a closed upper end, and a tapered portion 206 is formed in the intermediate portion. A plunger 209 is arranged facing the tapered portion 206 of the stator core 211 . The plunger 209 has a cylindrical shape and its upper end has a tapered shape corresponding to the shape of the tapered portion 206 . Plunger 209 has a shoulder 209a continuous with the tapered end, and washer 208 engages shoulder 209a. The washer 208 is made of a non-magnetic material such as SUS304, and prevents the stator core 211 made of a magnetic material and the plunger 209 from being attracted by residual magnetic force after energization. The plunger 209 is guided by the cylindrical portion 211a of the stator core 211 and moves vertically in FIG.

A normally closed compression spring 207 is arranged in the stator core 211 to bias the plunger 209 away from the stator core 211 . A yoke 201 is arranged on the outer periphery of the outer shell 220 of the coil bobbin 204 . The yoke 201 is made of an iron material, and its surface is plated with tin-zinc to enhance its antirust effect. A magnetic circuit is formed by the yoke 201 , the plunger 209 and the stator core 211 when the coil 205 is energized.

The electromagnetic section 230 is configured by the above configuration. The electromagnetic section 230 is coupled with the flow path section 240 via the O-ring 213 . The flow path portion 240 is formed by a valve body 240a. The valve body 240a is made of a resin material such as PPS (polyphenylene sulfide resin).

An inflow passage 222 into which high-pressure washer fluid from the pump 120 flows is formed in the valve body 240a. The outer circumference of the end of the inflow passage 222 is tapered so that the pipe 102 can be easily connected. A retaining shoulder 224 is formed at the tapered end to prevent the pipe 102 from coming off.

As shown in enlarged view in FIG. 3, a valve chamber 225 is formed in the valve body 240a, and the valve chamber 225 communicates with the inflow passage 222. An upper portion of the valve body 240 a is a connecting portion 241 that joins with the electromagnetic portion 230 . The connecting portion 241 has a circular tubular shape, and the lower end of the plunger 209 is arranged therein. Connecting portion 241 also widens to form a top surface 242 that receives O-ring 213 and a locking shoulder 243 that engages yoke 201 .

The valve body 240a is formed with a normally closed outflow passage 228 connected to the normally closed pipe 102a toward the camera 131. It is the same as the inflow passage 222 described above that the end portion is tapered and the retaining shoulder portion 224 is formed. Both the normally closed outflow passage 228 and the inflow passage 222 have an inner diameter of the order of 3 millimeters.

A valve chamber 225 is formed between the inflow passage 222 and the normally closed outflow passage 228 in the valve body 240a. A ring-shaped normally closed valve seat 229 communicating with a normally closed outflow passage 228 is formed facing the valve chamber 225 . A valve body 214 is arranged in the valve chamber 225 facing the normally closed valve seat 229 . The seating surface of the normally closed valve seat 229 is tapered and has an inner diameter of slightly less than 5 mm.

The valve body 214 consists of a cylindrical valve body 2141 forming a pressure relief passage 232 inside, and a circular tubular valve guide 2142 similarly forming a pressure relief passage 232 inside. The valve body 2141 is integrally formed of water-resistant rubber similar to the O-ring 213, and its surface is coated. The coating material is a substance such as fluorine or molybdenum that prevents the rubber surface from melting and improves the seating performance between the valve body and the mating valve seat. The valve guide 2142 is made of the same resin material as the valve body 240a.

The valve body 2141 is inserted into the lower end of the valve guide 2142. In this example, the valve body 2141 is press-fitted into the valve guide 2142 and fixed. However, the valve main body 2141 and the valve guide 2142 may be fixed using an adhesive.

A pressure relief valve 233 is arranged in the pressure relief passage 232 of the valve guide 2142 . The pressure relief valve 233 is made of resin and has a cylindrical shape, and its outer diameter is slightly smaller than the inner diameter of the pressure relief passage 232 formed in the valve guide 2142 . Therefore, the pressure relief valve 233 is guided by the valve guide 2142 and slides in the pressure relief passage 232 . A plurality of pressure relief grooves 233 a are formed on the outer circumference of the pressure relief valve 233 to facilitate the flow of working fluid in the pressure relief passage 232 of the valve guide 2142 .

A disk-shaped lid portion 2143 is formed on the upper portion of the valve guide 2142 . A plunger receiving portion 2147 with which the plunger 209 abuts is formed in the lid portion 2143 . A pressure relief hole 2144 is formed in the lid portion 2143 to communicate the pressure relief passage 232 inside the valve guide 2142 with the valve chamber 225 .

The upper surface of the valve body 2141 serves as a pressure relief valve seat 218 with which the pressure relief valve 233 abuts. The pressure relief valve 233 has a sealing surface 2331 formed to protrude in an annular shape in order to enhance the sealing performance with the pressure relief valve seat 218 .

A normally open compression spring 231 is arranged on the outer periphery of the valve guide 2142 within the valve chamber 225 . The lower end of the normally open compression spring 231 engages the valve body 240 a within the valve chamber 225 , and the upper end engages around the lid portion 2143 of the valve guide 2142 . The compression force of the normally open compression spring 231 is set smaller than the compression force of the normally closed compression spring 207 .

A pressure relief spring 216 that biases the pressure relief valve 233 toward the pressure relief valve seat 218 is arranged in the valve guide 2142 . The upper end of the pressure relief spring 216 is locked by the lid portion 2143 and the lower end of the pressure relief spring 216 is locked by the pressure relief valve 233 . A recess 2332 for holding the pressure relief spring 216 is formed in the pressure relief valve 233 . The set pressure (release pressure) of the pressure relief spring 216 is about 5 kilopascals, which is about half the set pressure (release pressure) of the stop valve 101 .

Next, a method for assembling the electromagnetic valve 200 having the above structure will be described. First, assembly of the electromagnetic section 230 will be described. A coil 205 is wound many times around the outer periphery of a coil bobbin 204, and a pair of terminals 221 are connected to both ends of the coil 205. In this state, an outer shell 220 and a connector 202 are molded with resin. For example, polyphenylene sulfide is used as the resin. Next, stator core 211 is arranged on the inner circumference of coil bobbin 204 . After that, the yoke 201 is arranged on the outer circumference of the outer shell 220 .

In the electromagnetic section 230 , a normally closed compression spring 207 is arranged inside the tapered portion 206 of the stator core 211 . Also, washer 208 is placed on shoulder 209 a of plunger 209 , and plunger 209 is placed inside stator core 211 in this state.

To assemble the flow path portion 240, the valve body 214 is first assembled. Assembly of valve body 214 places pressure relief spring 216 and pressure relief valve 233 within pressure relief passage 232 of valve guide 2142 . At this time, one end of the pressure relief spring 216 is engaged with the lid portion 2143 of the valve guide 2142 and the other end of the pressure relief spring 216 is engaged with the recess 2332 of the pressure relief valve 233 . In that state, the valve body 2141 is inserted into the valve guide 2142 . Upon insertion, the annular sealing surface 2331 of the pressure relief valve 233 seats against the pressure relief valve seat 218 of the valve body 2141 .

The valve main body 2141 and the valve guide 2142 are fixed by press fitting or adhesive as described above. The valve body 214 and the normally open compression spring 231 assembled in the above steps are arranged in the valve chamber 225 . In the arranged state, the upper end of the normally open compression spring 231 is locked by the lid portion 2143 of the valve guide 2142, and the lower end is locked by the valve body 240a.

Next, the flow path part 240 and the electromagnetic part 230 are assembled. Assembly places the O-ring 213 on the top surface 242 of the valve body 240a. Also, the lower end of the plunger 209 is brought into contact with the plunger receiving portion 2147 formed on the lid portion 2143 of the valve guide 2142 . In this state, the lower end of the yoke 201 is crimped toward the locking shoulder 243 of the valve body 240a. Crimping is performed on the entire circumference of the yoke 201 except for the portion where the connector 202 is positioned.

Due to this crimping of the yoke 201, the upper end of the valve body 240a contacts the lower end of the stator core 211, and the O-ring 213 is compressed and deformed by the lower end of the stator core 211 and the upper surface 242 of the valve body 240a. This prevents the working fluid that has flowed in from the inflow passage 222 from leaking out of the electromagnetic valve 200 .

According to the present disclosure, since the assembly of the electromagnetic section 230 and the assembly of the flow path section 240 are separated, the component shape of the flow path section 240 can be selected, and the electromagnetic section 230 can be shared. The flow path portion 240 may change the direction of the inflow passage 222 , the normally open outflow passage, and the normally closed outflow passage 228 . Even if the channel portion 240 is changed in this way, the same electromagnetic portion 230 can be used in common.

Next, the operation of the solenoid valve 200 of the present disclosure will be described. When the nozzle 100 does not jet the washer fluid toward the camera 131, the electromagnetic valve 200 is not energized. Therefore, the biasing force of the normally closed compression spring 207 is applied to the valve body 214 through the plunger 209, closing the normally closed valve seat 229. As shown in FIG.

In FIG. 1, the solenoid valve 200 is not arranged in the normally open pipe 102b facing the rear window glass 130. Therefore, when the operation of the pump 120 is started, high-pressure washer fluid is sent through the pipe 102 to the normally open pipe 102b. The sent washer fluid is injected from nozzle 100 through stop valve 101 . Since the pressure of the washer fluid rises to about 400 kilopascals, the release pressure of the stop valve 101 (about 10 kilopascals) poses almost no problem.

When the cleaning of the rear window glass 130 is completed, the pump 120 is stopped. As the pump stops, the pressure in the pipe 102 becomes atmospheric pressure, so the pipe 102 is closed by the stop valve 101 . By closing the stop valve 101, it is possible to prevent liquid from running out at the end of injection.

When spraying the washer fluid onto the camera 131, the electromagnetic valve 200 is energized. The coil 205 is excited by energization, and a magnetic circuit is formed in the yoke 201 , plunger 209 and stator core 211 . A magnetic diaphragm portion 206 a is formed at the lower end portion of the tapered portion 206 of the stator core 211 . Therefore, the magnetic gap between the tapered portion 206 and the tapered portion of the plunger 209 is narrowed by the magnetic force. As a result, plunger 209 moves toward tapered portion 206 of stator core 211 against the compressive force of normally closed compression spring 207 .

As the plunger 209 moves, the valve body 214 is pushed up by the normally open compression spring 231 to open the normally closed valve seat 229 . It should be noted that the above operation of the solenoid valve 200 is performed before the operation of the pump 120 is started. Therefore, the high-pressure washer fluid pressure from the pump 120 is not applied to the valve body 214, and the movement of the valve body 214 is not hindered.

After the solenoid valve 200 is energized to open the flow path, the pump 120 starts operating. High pressure washer fluid from pump 120 flows into inlet passage 222 and then flows out of normally closed outlet passage 228 via valve chamber 225 and normally closed valve seat 229 . The washer fluid that has flowed out is jetted from the nozzle 100 to the camera 131 via the stop valve 101 from the normally closed pipe 102a.

When the cleaning of the camera 131 is completed, the operation of the pump 120 is stopped, and when the pressure of the normally closed pipe 102a falls below the release pressure of the stop valve 101, the stop valve 101 is also closed. At the same time, the energization of the solenoid valve 200 is terminated. By closing the stop valve 101 , it is possible to improve the liquid depletion at the end of injection, similarly to the cleaning of the rear window glass 130 . In addition, the washer fluid can be stored in the normally closed pipe 102a, and the responsiveness at the next operation can be improved.

Since the washer 208 made of a non-magnetic material is interposed between the stator core 211 and the plunger 209, the magnetic circuit is interrupted when the energization ends. As a result, normally closed compression spring 207 pushes plunger 209 downward.

Since the biasing force of the normally closed compression spring 207 is greater than the biasing force of the normally open compression spring 231, the valve body 214 is pressed against the normally closed valve seat 229. As described above, the normally closed valve seat 229 also has a tapered shape corresponding to the shape of the valve body 214 (valve main body 2141), so sealing can be ensured.

Thus, according to the present disclosure, the valve body 214 (valve main body 2141) is arranged to fit within the tapered shape of the normally closed valve seat 229, so the normally closed valve seat 229 can be reliably closed. . In particular, in this example, the valve body 214 (the valve main body 2141 and the valve guide 2142) is guided within the valve chamber 225, so that the valve body 214 moves smoothly.

When the ambient temperature rises after the operation of the pump 120 is finished, the washer fluid and air in the pipe 102 expand. Even if the normally open pipe 102b is closed by the stop valve 101, since the tank 110 side is open, the pressure is not released to the pump 120 side and does not increase. However, since both the normally closed valve seat 229 and the stop valve 101 are closed in the normally closed pipe 102a, the washer fluid is confined in the normally closed pipe 102a. Therefore, there is a possibility that the pressure inside the normally closed pipe 102a may rise due to expansion of the washer fluid or air.

If the pressure exceeds the release pressure of the stop valve 101, the washer fluid in the normally closed pipe 102a may drip from the nozzle 100 to the camera 131. However, in the present disclosure, the pressure relief valve 233 opens to release pressure, ensuring that washer fluid leakage is prevented.

When the pressure in the normally closed pipe 102a becomes higher than the relief pressure, the biasing force of the pressure relief spring 216 is overcome and the pressure relief valve 233 is lifted. As a result, the pressure relief valve seat 218 opens and the pressure relief passage 232 between the valve body 2141 and the valve guide 2142 is opened. The normally closed outflow passage 228 communicates with the inflow passage 222 via a pressure relief groove 233 a on the outer circumference of the pressure relief valve 233 and a pressure relief hole 2144 formed in the lid portion 2143 of the valve guide 2142 .

The relief pressure of the pressure relief valve 233 is about half the release pressure of the stop valve 101. Therefore, the pressure relief valve 233 is opened before the stop valve 101 is opened, and the pressure rise in the normally closed pipe 102a can be suppressed.

Here, since the pressure relief passage 232 releases the pressure of the trapped washer fluid, a large amount of the washer fluid does not flow through the pressure relief passage 232. Therefore, even if there is a portion with a small flow passage cross-sectional area such as the pressure relief groove 233a of the pressure relief valve 233 or the pressure relief hole 2144, there is no malfunction in operation. If the pressure relief grooves 233a of the pressure relief valve 233 are formed in a plurality of places, the shape can be balanced symmetrically around the axis. However, the number of pressure relief grooves may be one as long as the cross-sectional area of the flow path is ensured.

Also, since the pressure relief valve 233 is held by the valve guide 2142, even if the set pressure of the pressure relief spring 216 is small, the seal with the pressure relief valve seat 218 is ensured.

In the present disclosure, since the pressure relief passage 232 is arranged inside the valve body 240a, the layout of the pressure relief passage 232 is compact. In particular, since the pressure relief passage 232 is formed inside the valve body 214 (the valve main body 2141 and the valve guide 2142), it is possible to downsize the overall structure. Even if the pressure relief passage 232 is formed inside the valve body 240a, if the pressure relief passage 232 is formed outside the valve body 214, a space for providing the pressure relief passage 232 is required in the valve body 240a. Further, the formation of the pressure relief passage 232 complicates the shape of the valve body 240a.

In particular, when the pressure relief passage 232 is formed outside the valve body 214 in the valve body 240a, it becomes necessary to provide a branch point with the pressure relief passage 232 in the normally closed outflow passage 228. Therefore, the direction of the normally closed outflow passage 228 cannot be freely set.

In contrast, in the present disclosure, the valve body 214 is arranged in the valve chamber 225 , and the valve chamber 225 is closer to the inflow passage 222 than the normally closed valve seat 229 . That is, the pressure environment in which the valve body 214 is arranged is similar to the pressure in the inflow passage 222 . Therefore, a pressure relief passage 232 is provided inside the valve body 214 . Pressure relief passage 232 may be opened by pressure relief valve 233 . As a result, the pressure in the normally closed outflow passage 228 can be reduced to the pressure in the inflow passage 222 .

Also, the normally closed outflow passage 228 communicates with the pressure relief passage 232 of the valve guide 2142 via the pressure relief passage 232 of the valve body 2141 . Therefore, there is no need to provide a special branch point connecting the normally closed outflow passage 228 and the pressure relief passage 232 . As a result, the position of the normally closed outflow passage 228 can also be freely set. In the example of FIG. 2, the normally closed outflow passage 228 is positioned 180 degrees opposite the inflow passage 222, but the normally closed outflow passage 228 can be arranged in the same direction as the inflow passage 222. Also, in the example of FIG. 2, the normally closed outflow passage 228 is arranged horizontally, but the normally closed outflow passage 228 can also be arranged in the vertical direction.

Both the vertical angle and the circumferential angle of the normally closed outflow passage 228 can be freely set. As described above, in the present disclosure, the electromagnetic portion 230 and the flow path portion 240 are separately molded and assembled. Therefore, the fact that there are no restrictions on the layout of the normally closed outflow passage 228 increases the degree of freedom in routing between the solenoid valve 200 and the piping.

In particular, in the present disclosure, the valve body 214 is divided into a valve main body 2141 and a valve guide 2142, and the pressure relief valve 233 is arranged in the pressure relief passage 232 inside. Therefore, the arrangement of the pressure relief valve 233 and the pressure relief spring 216 is facilitated. At the same time, the upper end of the valve body 2141 can be used as the pressure relief valve seat 218 . Also, the pressure relief passage 232 of the valve guide 2142 can be used as a sliding guide for the pressure relief valve 233 .

(Other embodiments)
In the above disclosure, the valve main body 2141 and the valve guide 2142 are press-fitted or fixed with an adhesive. Alternatively, as shown in FIG. 4, it may be fixed with a snap fit. In this case, the cylindrical portion of valve guide 2142 comprises a plurality of locking windows 2145 . Further, the valve body 2141 is provided with a locking claw portion 2146 at a position corresponding to the locking window portion 2145 . When the valve main body 2141 is inserted into the valve guide 2142 , the locking claw portion 2146 is elastically deformed so that the locking claw portion 2146 enters the locking window portion 2145 .

Also, in the above disclosure, the valve body 240a is configured as a single body, but it may be divided into an upper body and a lower body. In that case, the two members are fixed using a fixing method such as welding, bolt fixing, or clip fixing. Also, the valve body 240a may be composed of three or more members.

Also, in the above example, the normally closed valve seat 229 is tapered and the valve main body 2141 is arcuate, but the shapes are not necessarily limited to these shapes. The normally closed valve seat 229 may be arcuate, and the valve body 2141 may be planar. Similarly, it is desirable for the pressure relief valve 233 to have an annular sealing surface 2331 in terms of sealing performance, but it may have a planar shape.

Also, in the above example, the pressure relief valve 233 is formed with the recess 2332 to hold the pressure relief spring 216 , but the shape of the retention is not limited to the recess 2332 . A convex portion may be formed on the pressure relief valve 233 and arranged in the pressure relief spring 216 .

Also, the washer fluid was used as the working fluid, but other liquids such as water and oil may be used as the working fluid. Furthermore, in the example of FIG. 1, the objects to be cleaned are the rear window glass 130 and the camera 131, but it is of course possible to use them for cleaning other objects.

The disclosure in this specification, drawings, etc. is not limited to the illustrated embodiments. The disclosure encompasses the illustrated embodiments and variations thereon by those skilled in the art.

Claims

a coil (205) that is excited when energized;
A stator core (211) made of a magnetic material arranged in the magnetic circuit when the coil is energized;
a plunger (209) arranged opposite to the stator core via a magnetic gap in the magnetic circuit when the coil is energized;
a valve body (214) that moves with the plunger;
a valve body (240a) having an inflow passageway for working fluid, an outflow passageway for working fluid, and a normally closed valve seat formed between the inflow passageway and the outflow passageway and against which the valve element abuts;
A normally closed compression spring (207) that presses the valve body toward the normally closed valve seat,
The valve body forms therein a pressure relief passage (232) connecting the outflow passage and the inflow passage,
The valve body closes the pressure relief passage when the pressure of the working fluid in the outflow passage is lower than, equal to, and higher than the pressure of the working fluid in the inflow passage by a pressure difference less than a predetermined relief pressure. a pressure relief valve (233) which opens the pressure relief passage when the pressure of the working fluid in the outflow passage is higher than the pressure of the working fluid in the inflow passage by a pressure difference equal to or greater than the relief pressure; A solenoid valve placed in the pressure relief passage.
The valve body includes a valve main body having an inside forming the pressure relief passage and an outside seated on the normally closed valve seat, and a tubular valve guide inside forming the pressure relief passage,
2. The solenoid valve of claim 1, wherein said pressure relief valve is slidably disposed within said valve guide.
The solenoid valve according to claim 2, wherein a pressure relief valve seat on which said pressure relief valve is seated is formed around said pressure relief passage inside said valve body.
The solenoid valve according to claim 3, comprising a pressure relief spring that biases the pressure relief valve against the pressure relief valve seat.
a normally open compression spring that biases the valve body in a direction away from the normally closed valve seat when the coil is energized;
The normally open compression spring is arranged on the outer circumference of the valve guide,
5. The solenoid valve according to claim 2, wherein one end of said normally open compression spring is engaged with said valve body and the other end of said normally open compression spring is engaged with said valve guide.
6. The valve body and the valve guide are connected together by engaging a locking pawl formed on the valve body with a locking window formed on the valve guide. Solenoid valve described in .
The electromagnetic valve (200) comprises a working fluid tank (110), a pump (120) that sucks the working fluid from the tank and discharges high-pressure working fluid, and a pipe (102) through which the working fluid from the pump flows. ) and a stop valve (101 ) is a working fluid control device using a solenoid valve used with
The solenoid valve is arranged between the pump and the stop valve of the pipe,
7. A working fluid control device using an electromagnetic valve according to claim 1, wherein said release pressure of said pressure relief valve is smaller than said release pressure of said stop valve.