KR102490675B1 - Solenoid valve - Google Patents

Abstract

The present invention relates to a solenoid valve capable of preventing friction, vibration and noise by minimizing the contact area between components such as a holder, a plunger, and a valve body, a hollow holder having a supply port and a discharge port, and an interior of the holder. A plunger installed in and moved by a solenoid, a guide ring provided on an outer circumferential surface of the plunger and in contact with the holder, installed inside the holder and moved by the plunger, and connecting the supply port and the discharge port, or It includes a valve body for blocking and a spring installed inside the holder and elastically supporting the plunger.

Description

Solenoid valve {SOLENOID VALVE}

The present invention relates to a solenoid valve, and more particularly, to a solenoid valve capable of preventing friction, vibration, and noise by minimizing a contact area between parts such as a holder, a plunger, and a valve body.

A fuel cell electric vehicle (FCEV) is a vehicle to which a fuel cell is applied instead of an internal combustion engine, and is configured to drive by a motor driven by electric energy generated by a reaction between hydrogen and oxygen.

A typical fuel cell vehicle includes a hydrogen tank for storing hydrogen, a stack for generating electricity through an oxidation-reduction reaction between hydrogen and oxygen, a device for draining the generated water, a battery for storing electricity generated in the stack, and a battery for storing electricity generated in the stack. It is configured to include a controller that converts and controls electricity and a motor that generates driving force.

Hydrogen, the fuel of a fuel cell vehicle, is stored in a storage tank along a charging and discharging flow path and then supplied to the stack. At this time, the high-pressure hydrogen supplied from the hydrogen tank is reduced to a certain pressure and then supplied to the stack.

Meanwhile, a solenoid valve that operates according to a signal applied through a controller and opens or closes the discharge passage and simultaneously prevents a reverse flow of hydrogen transferred to the stack is installed on a discharge passage through which fuel is transferred to the stack.

A solenoid valve for a fuel cell vehicle includes a holder formed with a port and a flow path for fuel entry and transportation, a plunger that moves by a magnetic field generated by a coil, and a plunger that moves by the plunger and opens or closes the flow path. It is comprised including a valve body.

The above-described solenoid valve has a problem in that friction, vibration, and noise (high frequency noise, chattering noise, etc.) are generated in the process of sliding the plunger in contact with the holder during operation.

In addition, a very small amount of moisture may be included in the process of manufacturing and transporting hydrogen, and there is a problem when the contained moisture is filled with low-temperature fuel and when the fuel is used, the pressure is lowered and the temperature is lowered.

Registered Patent Publication No. 10-2086424 (2020.03.09.) Registered Patent Publication No. 10-2230582 (2021.03.22.)

An object of the present invention is to provide a solenoid valve capable of preventing friction, vibration and noise by minimizing the contact area between components such as a holder, a plunger, and a valve body.

Another object of the present invention is to provide a solenoid valve capable of preventing deterioration in operability due to fixation of parts as moisture between a holder and a plunger or between a holder and a valve body freezes.

The present invention for achieving the above object is a solenoid valve for regulating the flow of fuel supplied to a stack of a fuel cell vehicle, comprising a hollow holder having a supply port and a discharge port, installed inside the holder and moved by a solenoid. A plunger provided on an outer circumferential surface of the plunger and in contact with the holder, a valve body installed inside the holder and moved by the plunger to connect or block the supply port and the discharge port, It is installed inside the holder and includes a spring for elastically supporting the plunger.

Here, the guide ring may be formed of a larger diameter than the plunger, and may be composed of two or more spaced apart in the longitudinal direction of the plunger.

In addition, it may have a C-shape surrounding the outer circumferential surface of the plunger, which is the guide ring.

In addition, the guide ring may be made of PTFE (Polytetrafluoroethylene).

Meanwhile, the holder has a pipe shape having a circular inner circumferential surface, and the valve body has a polygonal cross section inscribed in the holder.

At this time, each corner of the valve body may be formed in a curved surface so as to be in close contact with the inner wall of the holder.

The present invention configured as described above can reduce friction, vibration, and noise generated when the plunger moves by minimizing the contact area with the holder through the guide ring.

In addition, the present invention forms the inner circumferential surface of the holder in a circular shape and forms the valve body in a polygonal shape to minimize the contact area, thereby preventing deterioration in operability due to sticking of parts as moisture between the holder and the valve body freezes. .

1 is a cross-sectional view of a solenoid valve according to an embodiment of the present invention.
Figure 2 is an enlarged view of a part of the solenoid valve according to an embodiment of the present invention.
3 is a perspective view of a plunger and a valve body of a solenoid valve according to an embodiment of the present invention;
Figure 4 is a cross-sectional view AA of Figure 2;
5 to 7 are diagrams showing the operation process of the solenoid valve according to an embodiment of the present invention.

A preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings. Here, if it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, the same reference numerals in the drawings are used to indicate the same or similar components.

A solenoid valve according to an embodiment of the present invention is a valve that regulates the flow of fuel supplied to a stack (not shown) of a fuel cell vehicle.

As shown in FIG. 1, the solenoid valve 10 according to the present embodiment is composed of a valve 100 for regulating the flow of fuel and a solenoid 200 for operating the valve 100 when power is applied.

The valve 100 connects holders 110 and 120 having ports 112 and 122 for fuel entry and exit, a plunger 130 moving by the solenoid 200, and ports 112 and 122 moving by the plunger 130. Alternatively, it is composed of a valve body 140 that blocks and a spring 150 that elastically supports the plunger 130.

In addition, the solenoid 200 is coupled to the top of the case 210, the bobbin 220 installed inside the case 210, the coil 230 wound on the outer circumferential surface of the bobbin 220, and the holders 110 and 120. It includes a core 240.

Referring to FIG. 2, the holders 110 and 120 include a pipe-shaped holder body 110 extending in one direction (vertical direction in the drawing) and a disk-shaped holder cap 120 coupled to the lower end of the holder body 110. ) is composed of

The holder body 110 is formed in a pipe shape, but the inner peripheral surface is formed in a circular shape, which is to minimize the contact area with the polygonal valve body 140 installed inside the holder body 110.

A supply port 112 for the inflow of fuel is formed at the lower end of the holder body 110, and a filter 114 for removing foreign substances contained in the fuel is formed around the lower end of the holder body 110 where the supply port 112 is formed. ) is provided. In addition, an O-ring 116 for sealing with an assembly body (not shown) into which the holder body 110 is inserted is provided on the lower outer circumferential surface of the holder body 110 .

Inside the holder body 110, a mounting space 118a, a first operating space 118b, and a second operating space 118c are provided.

The mounting space 118a, the first operating space 118b, and the second operating space 118c are formed inside the top, inside the middle, and inside the bottom of the holder body 110, respectively. A core 240, a plunger 130, and a valve body 140 are installed in each of the spaces 118a to 118c.

The holder cap 120 is formed in a multi-stage disc shape so that it can be assembled to the open lower end of the holder body 100 . A discharge port 122 for discharging fuel is formed at the center of the holder cap 120 .

The plunger 130 is movably installed in the first operating space 118b of the holder body 110 and is raised or lowered by the magnetic force generated by the coil 230 or the elastic force of the spring.

The plunger 130 of this embodiment has a rod shape extending in one direction (vertical direction in the drawing). A mounting groove 132 is formed at the lower end of the plunger 130, and the valve body 140 is inserted into the mounting groove 132. At this time, the valve body 140 is caught and fixed by the locking pin 134 coupled through the side surface of the mounting groove 132. In other words, the valve body 140 is raised or lowered by the plunger 130, but may contact or be separated from the plunger 130 in the process.

A guide ring 160 in contact with the inner wall of the first operating space 118b is provided on the outer circumferential surface of the plunger 130 . The guide ring 160 serves to reduce friction, vibration, and noise generated when the plunger 130 moves by minimizing a contact area with the inner wall of the first operating space 118b.

The guide ring 160 surrounds the outer circumferential surface of the plunger but is formed in a C-shape with one side open and has a larger diameter than the plunger 130. In addition, the guide ring 160 is composed of two or more spaced apart in the longitudinal direction so that the plunger 130 is not eccentric or tilted.

The guide ring 160 described above may be made of polytetrafluoroethylene (PTFE) material having excellent heat resistance, corrosion resistance, friction resistance, and mechanical strength.

Meanwhile, an installation space 136 is formed at the top of the plunger 130, and a spring 150 and a damper 170 are installed in the installation space 136. At this time, the spring 150 serves to elastically support the plunger 130 downward, and the damper 170 reduces the impact and noise generated when the plunger 130 contacts the valve body 140 in the process of rising or falling. plays a role in reducing

The damper 170 of this embodiment contacts or is separated from the valve body 140 while the plunger 130 is raised or lowered, and closes or opens the auxiliary passage 146 formed in the valve body 140 . That is, when the damper 170 contacts the valve body 140, the auxiliary flow path 146 is closed, and when the damper 170 is separated from the valve body 140, the auxiliary flow path 146 is opened.

The above-described dampers 170 are provided in the installation space 136 and constitute a pair spaced apart in the longitudinal direction, and a spring 150 is interposed between the pair of dampers 170 .

On the other hand, first and second connection holes 138 and 139 are formed on the side surface of the plunger 130 . The first connecting hole 138 connects the second operating space 118c and the auxiliary passage 146, and the second connecting hole 139 connects the second operating space 118c and the installation space 136. At this time, the first connection hole 138 is for pressure equalization of the supply port 112 and the control port 122, and the second connection hole 139 is for the plunger 130 for the internal pressure of the holder 100. This is to eliminate the operating resistance.

The valve body 140 is movably installed in the second operating space 118c of the holder body 110, rises or falls by the plunger 130, and connects the supply port 112 and the discharge port 122, or block it

The valve element 140 has a rod shape in one direction (vertical direction in the drawing), and is formed in a polygonal cross section inscribed in the second operating space 118c of the holder body 110 having a circular inner circumferential surface, and is formed in a polygonal shape. Each corner of is formed in a curved surface so as to come into close contact with the inner wall of the second operating space 118c.

In this embodiment, the contact area with the holder body 110 can be minimized by forming the valve body 140 into the aforementioned polygonal shape, and as moisture between the holder body 110 and the valve body 140 freezes, the parts It can solve the problem of sticking and deteriorating operability.

As described above, the valve body 140 is disposed in the longitudinal direction with the plunger 130 and is caught and fixed by the plunger 130 . To this end, a mounting portion 142 inserted into the mounting groove 132 is formed at the upper end of the valve body 140, and a locking groove 144 into which the locking pin 134 is inserted is formed around the mounting portion 142. .

An auxiliary flow path 146 is formed inside the valve body 140 . The auxiliary passage 146 is opened when the valve body 140 is separated from the plunger 130, more specifically, the damper 170.

Referring to FIG. 1 , the solenoid 200 is composed of a case 210, a bobbin 220, a coil 230, and a core 240.

The case 210 has a cup shape in which the lower surface is open and the upper surface is sealed. A space is formed inside the case 210, and the above-described parts 220 to 240 are installed in the space.

The bobbin 220 has a hollow spool shape. A coil 230 generating a magnetic field is wound around the outer circumferential surface of the bobbin 220 . The bobbin 220 is made of synthetic resin so as to electrically block between the coil 230 and the core 240 and between the coil 230 and the plunger 140.

The coil 230 is a conducting wire that generates a magnetic field around the bobbin 220 when power is applied, and is densely and uniformly wound around the outer circumferential surface of the bobbin 220 to form a cylindrical shape.

When power is applied, the magnetic field generated by the coil 230 is induced by the core 240 to raise the plunger 130. At this time, the strength of the magnetic field is proportional to the strength of the current flowing along the coil 230 and the number of coils 230 wound around the bobbin 220 .

Accordingly, the movement of the plunger 130 can be reliably controlled because a strong magnetic field is generated as a strong current is applied to the coil 230 or as the coil 230 is wound more frequently.

The core 240 is a fixed iron core that induces the magnetic field generated by the coil 230. The magnetic field induced by the core 240 generates an attractive force, and the plunger 130 rises due to the attractive force.

Referring to FIGS. 5 to 7 , the operation process of the solenoid valve according to the present embodiment will be reviewed.

5 shows a state in which power is not applied to the solenoid valve.

When power is not applied to the solenoid valve, the plunger 130 and the valve body 140 are lowered by the elastic force of the spring 150 to block the connection between the supply port 112 and the discharge port 122. In addition, since the damper 170 contacts the valve body 140 and closes the auxiliary flow path 146, fuel flow does not occur.

6 shows an initial state in which power is applied to the solenoid valve.

Initially, when power is applied to the solenoid valve, the magnetic field induced by the core 240 raises the plunger 130, but the valve body 140 is moved by the high pressure difference of the fuel introduced through the supply port 112. can't rise At this time, the damper 170 is spaced apart from the valve body 140 to open the auxiliary flow path 146, so that fuel flows. That is, since the fuel introduced through the supply port 112 is discharged through the discharge port 122, the pressure of the supply port 112 and the discharge port 122 is reduced and equilibrium is achieved.

7 shows a later state in which power is applied to the solenoid valve.

After the power is applied to the solenoid valve, the magnetic field induced by the core 240 raises the plunger 130 together with the valve body 140 fixed to the plunger 130 . At this time, the supply port 112 and the discharge port 122 are connected and the fuel introduced through the supply port 112 is discharged through the discharge port 122 .

As described above, the present invention has been described with reference to the drawings illustrated, but the present invention is not limited by the embodiments and drawings disclosed herein, and various modifications are made by those skilled in the art within the scope of the technical idea of the present invention. It is obvious that variations can be made. In addition, although the operation and effect according to the configuration of the present invention have not been explicitly described and described while describing the embodiments of the present invention above, it is natural that the effects predictable by the corresponding configuration should also be recognized.

100: valve 110, 120: holder
130: plunger 140: valve body
150: spring 200: solenoid
210: case 220: bobbin
230: coil 240: core

Claims (11)

A solenoid valve for regulating the flow of fuel supplied to a stack of a fuel cell vehicle,
A hollow holder having a supply port and a discharge port;
a plunger installed inside the holder and moved by a solenoid;
a guide ring provided on an outer circumferential surface of the plunger to reduce friction, vibration, and noise generated when the plunger moves by minimizing a contact area with the holder;
a valve body installed inside the holder, moved by the plunger, and connecting or blocking the supply port and the discharge port; and
A spring installed inside the holder and elastically supporting the plunger,
The plunger and the valve body are connected in the longitudinal direction, and the valve body is connected to the plunger so as to be in contact with or spaced apart from,
An auxiliary flow path is formed inside the valve body, and the auxiliary flow path is opened when the valve body is separated from the plunger.
The plunger is provided with a damper for reducing shock and noise generated when in contact with the valve body,
The damper is in contact with or spaced apart from the valve body and closes or opens the auxiliary flow path,
The damper is provided inside the plunger and consists of a pair spaced apart in the longitudinal direction,
Solenoid valve, characterized in that the spring is provided between the pair of dampers.
The method of claim 1,
The solenoid valve, characterized in that the guide ring is formed of a larger diameter than the plunger, and consists of two or more spaced apart in the longitudinal direction of the plunger.
The method of claim 2,
The solenoid valve, characterized in that the C-shape surrounding the outer circumferential surface of the plunger, which is the guide ring.
The method of claim 3,
The guide ring is a solenoid valve, characterized in that PTFE (Polytetrafluoroethylene) material.
The method of claim 1,
The holder has a pipe shape with a circular inner circumferential surface,
The solenoid valve, characterized in that the valve body is formed in a polygonal cross section inscribed in the holder.
The method of claim 5,
Each corner of the valve body is formed in a curved surface so as to be in close contact with the inner wall of the holder.
delete The method of claim 1,
A solenoid valve, characterized in that a mounting groove into which the valve body is inserted is formed at one end of the plunger, and a locking pin for hooking and fixing the valve body inserted into the mounting groove is coupled to a side surface of one end of the plunger.
The method of claim 8,
A solenoid valve, characterized in that a mounting portion inserted into the mounting groove is formed at the other end of the valve body, and a locking groove into which the locking pin is inserted is formed around the mounting portion.
delete delete

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