KR102587842B1 - Fuel cut-off valve - Google Patents

Abstract

The present invention relates to a fuel cutoff valve, which is installed on a holder having an inflow path and an discharge path and opens and closes the discharge path. The fuel cutoff valve is coupled to the inside of a bobbin around which a coil that generates a magnetic field is wound when power is applied, and the coil A core that is magnetized by a magnetic field, an armature that is inserted into an armature insertion groove formed to be open to the lower side of the core and raised and lowered by the magnetic field of the coil, is inserted to be able to be raised and lowered to a pilot insertion groove formed to be open to the lower side of the armature, and is restrained by the armature. It is installed to protrude from the upper and lower sides through the interior of the pilot and armature, which is raised and lowered to open and close the discharge path, and includes a shock absorber that elastically supports the core and pilot, thereby reducing noise and vibration that may occur in the armature or pilot during operation.

Description

Fuel cut-off valve {Fuel cut-off valve}

The present invention relates to a fuel cutoff valve, which reduces noise and vibration that may occur in an armature or pilot during operation.

The fuel cutoff valve is placed in the pipe where fuel is supplied and is a valve that blocks the supply of fuel.

A solenoid valve is a valve that operates by a magnetic field. A solenoid valve generally includes a coil that generates magnetic force, a bobbin around which the coil is wound, a core that is magnetically interlocked with the coil, a yoke that is spaced apart from the core, and an armature that is inserted into the yoke and moves by the magnetic force of the coil.

According to the prior art, the inlet end of the fuel shutoff valve is filled with fuel, while the outlet end is filled with air or is in a vacuum state, so there is a pressure difference between both ends. Furthermore, due to the nature of the solenoid valve, the force to operate the valve is less than that of other types of valves. Therefore, if the magnetic force of the solenoid valve is smaller than the pressure difference between the inlet and outlet ends, there is a problem in that the fuel cutoff valve cannot operate because the armature cannot move.

In order to solve the problems of the prior art, the fuel shutoff valve is provided with a pilot valve. The pilot valve operates before the armature operates and reduces the pressure difference between the inlet and outlet ends of the fuel shutoff valve. Accordingly, the magnetic force required to move the armature is reduced, and the fuel shutoff valve can operate more easily.

Domestic registered patent No. 10-1142789 is presented as prior art regarding the fuel shutoff valve equipped with the pilot valve.

The prior art relates to high pressure, large flow solenoid latch valves. The prior art relates to a high-pressure, large-flow solenoid latch valve that maintains the closed or open state of the valve with low power, but can also be applied to high-pressure, large-flow fluids. The prior art is provided with a poppet connected to the bottom of the plunger, and the bottom of the poppet is inserted into the upper side and a seal is provided to open and close the flow path. Additionally, a plurality of flow paths are formed in the seal to allow fluid to flow.

However, according to the prior art, the poppet and seal must be manufactured separately, and the poppet must be forced into the seal. Therefore, once the poppet is inserted into the seal, it is very difficult to separate it again, and when the poppet is separated from the seal, the seal is torn and cannot be used again.

In addition, the durability of the solenoid valve in the prior art is weakened due to collision with surrounding parts when the plunger moves up and down. Even if springs are used to solve this problem, the spring also has durability problems when used for a long time, and the spring is also made of metal. Therefore, there was a problem in that noise and vibration were generated due to impact during a collision.

Domestic registered patent No. 10-1142789 (2012.04.27)

The present invention was conceived in the background described above. The purpose of the present invention is to provide a fuel shutoff valve that is easy to assemble and disassemble and has excellent reliability. There is.

Additionally, the purpose is to provide a fuel cutoff valve that reduces noise and vibration that may occur in the armature or pilot during operation.

The object of the present invention is not limited here, and other objects not mentioned will be clearly understood by those skilled in the art from the description below.

According to the present invention, in a fuel shutoff valve installed on a holder having an inflow path and an discharge path to open and close the discharge path, the core is coupled to the inside of a bobbin around which a coil that generates a magnetic field when power is applied is wound, and is magnetized by the magnetic field of the coil. , an armature that is inserted into an armature insertion groove formed to open to the lower side of the core and goes up and down due to the magnetic field of the coil, is inserted to be able to go up and down in a pilot insertion groove formed to open to the lower side of the armature, is restrained by the armature and moves up and down, opening and closing the discharge passage. A fuel cut-off valve may be provided that passes through the interior of the pilot and armature and protrudes toward the upper and lower sides and includes a shock absorbing portion that elastically supports the core and the pilot.

Here, the armature includes a first accommodating part formed by being recessed into a cylindrical shape on the upper side, a second accommodating part formed by being recessed into a cylindrical shape at the center of the lower side, and a connecting passage that communicates the first accommodating part and the second accommodating part. It can be provided.

In addition, the shock absorbing part may be formed by injection into the first receiving part, the second receiving part, and the connecting passage of the armature.

This shock absorber is formed in the first receiving portion and protrudes upward from the armature to elastically support the bottom surface of the armature insertion groove, and is formed in the second receiving portion to elastically support the upper protrusion formed on the upper side of the pilot. It may include a pilot support member and a connection member formed in the connection passage and integrally formed with the core support member and the pilot support member.

Additionally, the core support member may have a protrusion protruding from the upper side, so that the upper side may be formed in a multi-stage shape.

Accordingly, when the core support member collides with the core, the protrusions are deformed to absorb shock, and the upper side is formed to protrude more than the upper side of the armature, thereby preventing collision between the core and the armature.

Additionally, the fuel cutoff valve may further include a return spring disposed between the core and the armature to support the armature toward the discharge path.

Additionally, the armature may be formed by being recessed in the center of the upper side and may be provided with a spring insertion groove into which a portion of the return spring is inserted.

In addition, the core has a core extension formed in a hollow shape at the lower end to be inserted into the chamber formed in the holder, and the fuel cutoff valve is formed in a ring shape and is inserted into the sealing member insertion groove formed on the outer peripheral surface of the core extension portion and is inserted into the inner peripheral surface of the chamber. It may further include a sealing member supporting the.

As described above, according to the fuel cutoff valve according to the present invention, a shock absorbing part is provided on the armature, which has the effect of preventing damage caused by collision of the armature or pilot and reducing vibration and noise.

In addition, since the shock absorber is formed by injection into the armature, a separate assembly process is not necessary, and there is an effect of preventing the shock absorber from being separated.

In particular, the core support member of the shock absorber is provided in a multi-stage shape, which has the effect of absorbing shock in stages when colliding with the core and reducing noise.

1 is a simplified structural diagram of a fuel system in which a fuel shutoff valve according to the present invention is installed.
Figure 2 is an enlarged cross-sectional view of part A of Figure 1.
Figure 3 is a cross-sectional view of the fuel shutoff valve according to the present invention.
Figure 4 is a plan view of the armature of the fuel shutoff valve according to the present invention.
Figure 5 is a cross-sectional view taken along line BB of Figure 4.
Figure 6 is an enlarged cross-sectional view showing part D of Figure 5.
Figure 7 is a cross-sectional view taken along line CC of Figure 4.
Figure 8 is a cross-sectional view of the pilot of the fuel shutoff valve according to the present invention.
Figures 9 to 11 are diagrams showing the process by which the fuel cutoff valve according to the present invention opens and closes the discharge path.

Hereinafter, some embodiments of the present invention will be described in detail through illustrative drawings. When adding reference numerals to components in each drawing, it should be noted that the same components are given the same reference numerals as much as possible even if they are shown in different drawings. Additionally, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted.

Figure 1 is a simplified structural diagram of a fuel system in which a fuel cut-off valve according to the present invention is installed, Figure 2 is an enlarged cross-sectional view of portion A of Figure 1, Figure 3 is a cross-sectional view of the fuel cut-off valve according to the present invention, and Figure 4 is a plan view of the armature of the fuel shutoff valve according to the present invention, Figure 5 is a cross-sectional view taken along B-B in Figure 4, Figure 6 is an enlarged cross-sectional view showing part D of Figure 5, and Figure 7 is a cross-sectional view C-C in Figure 4. , Figure 8 is a cross-sectional view of the pilot of the fuel cut-off valve according to the present invention, and Figures 9 to 11 are diagrams showing the process of opening and closing the discharge path of the fuel cut-off valve according to the present invention.

As shown in these drawings, the fuel shutoff valve 10 according to an embodiment of the present invention is installed on the holder 20 in which the inflow path 21 and the discharge path 22 are formed to open and close the fuel discharge path 22. In the blocking valve 10, the core 300, which is coupled to the inside of the bobbin 210 around which the coil 220, which generates a magnetic field when power is applied, is wound, and is magnetized by the magnetic field of the coil 220, the core 300 The armature 400 is inserted into the armature insertion groove 311 formed to open downward and is raised and lowered due to the magnetic field of the coil 220, and is inserted into the pilot insertion groove 411 formed open to the lower side of the armature 400 so as to be raised and lowered. The pilot 500, which is restrained and lifted by the armature 400 and opens and closes the discharge path 22, passes through the interior of the armature 400 and protrudes toward the upper and lower sides, and includes the core 300 and the pilot 500. It includes a shock absorbing part 430 that provides elastic support.

In addition, in the detailed description of the present invention, for convenience of explanation, unless otherwise specified, the side of the holder 20 of the solenoid valve 10 will be designated as downward, and the side opposite to it will be designated as upward.

It is assumed that the fuel according to the present invention is hydrogen, and the place where the fuel shutoff valve 10 according to the present invention is placed is assumed to be a hydrogen vehicle.

According to the invention, fuel is stored in a tank. Fuel passes through the fuel shutoff valve 10 and is supplied or blocked as the fuel shutoff valve 10 is turned on/off. The fuel that passes through the fuel shutoff valve 10 passes through the proportional control valve, and as the opening value of the proportional control valve changes, the flow rate of the supplied fuel changes. Fuel that passes the proportional control valve flows into the fuel stack, and power is produced through a chemical reaction. According to the present invention, the responsiveness of fuel supply is improved and safety is improved by dualizing the supply of hydrogen into a blocking valve and a proportional control valve.

This fuel shutoff valve 10 is installed in the holder 20 and disposed on the flow path through which fuel flows, and is provided between the hydrogen tank and the fuel stack to supply or block hydrogen gas flowing into the fuel stack.

The holder 20 is provided with a mounting surface 23 on which the fuel cut-off valve 10 is mounted, and has a chamber 25 formed by being recessed in the mounting surface 23.

The chamber 25 is arranged so that the inflow path 21 and the discharge path 22 are connected to the bottom surface 26, and the discharge path 22 is located in the center of the bottom surface 26 and is formed from top to bottom. Fuel is discharged to the outside from the fuel shutoff valve (10). In addition, the inflow passage 21 is located at a location spaced apart from the discharge passage 22 on the bottom surface 26 of the chamber 25, that is, on the left side of the discharge passage 22 in the drawing, and is formed from the bottom to the top, and is formed from the bottom to the top. It can flow in radially from the outside downward to the inside upward.

In addition, the chamber 25 is formed to protrude from the bottom surface 26 and includes a valve seat 27 that protrudes along the circumference of the inlet portion of the discharge passage 22.

In this way, the fuel cutoff valve 10 is installed on one side of the holder 20 and includes a valve part that regulates the flow of fuel and a solenoid part that drives the valve part.

The valve unit is for discharging to the outside while applying a predetermined control pressure to the fuel flowing from an external hydraulic supply source. The armature 400 is raised and lowered due to the magnetic field of the solenoid unit, and the armature 400 is raised and lowered to the discharge path 22. ) includes a pilot 500 that opens and closes.

This valve unit is coupled to the armature 400 and includes an armature guide 600 that restrains the pilot 500 to the armature 400, and supports the armature 400 toward the discharge path 22 when the armature 400 moves upward. It may further include a return spring 700 that returns it to its original position.

Accordingly, when a magnetic field is generated in the solenoid part of the valve unit, the armature 400 moves upward by magnetic force to reduce the pressure difference between the inlet 21 and the outlet 22, and the armature 400 coupled to the ascending and descending armature 400 moves upward by magnetic force. The armature guide 600 is caught by the pilot 500 and moves the pilot 500 upward.

At this time, the armature 400 moves upward to create a space between the armature 400 and the pilot 500, but before the armature guide 600 is caught by the pilot 500, the armature 400, which will be described later, is removed. 1 The pilot passage 416 and the second pilot passage 540 of the pilot 500 are opened, and the pressure difference between the inlet passage 21 and the discharge passage 22 of the holder 20 is reduced.

The solenoid part is driven by controlling the valve part and includes a coil assembly 200 that generates a magnetic field and a core 300 that is magnetized by the magnetic field of the coil assembly 200 and raises and lowers the armature 400.

Below, the housing 100 and solenoid portion of the fuel shutoff valve 10 will be described in detail.

The housing 100 is provided to modularize the solenoid unit and mount it on the holder 20, and may include a case 110, a pole piece 120, and a molding unit 130.

The case 110 is formed in the shape of a cylindrical enclosure open on one side, surrounds the outer circumference and upper side of the coil assembly 200, and is seated on the upper end of the core 300.

The pole piece 120 is formed in a disk shape, covers the open portion of the case 110, is in close contact with the lower end of the bobbin 210, and the core 300 is inserted in the center. The pole piece 120 is formed to protrude from the outer peripheral surface and includes a plurality of protrusions 121 that protrude to the outside of the molding portion 130, which will be described later, and are spaced at equal intervals in the circumferential direction.

An insertion hole 122 through which the coupling member 103 passes is formed in the protrusion 121, and the plurality of coupling members 103 are respectively inserted into the holder 20 after passing through the insertion hole 122 of the protrusion 121. By screwing to the formed mounting part 24, the housing 100 and the solenoid part are easily and simply assembled to the holder 20.

The molding portion 130 surrounds the pole piece 120 and the case 110 and is formed by molding on the outside of the coil assembly 200 to completely fix the pole piece 120 and the case 110.

The coil assembly 200 of the solenoid unit consists of a bobbin 210 and a coil 220 wound around the bobbin 210.

The bobbin 210 is provided in a spool shape with flanges 433 formed at both ends of a hollow cylindrical body. A coil 220 is wound around the outer circumferential surface to generate a magnetic field when power is applied, and a fixed iron core 300 is inserted inside. do.

The coil 220 is connected to the terminal 101 and is powered. It is a conductive wire that generates a magnetic field around the bobbin 210 when power is applied, and is tightly and evenly wound around the outer circumference of the bobbin 210 to form a cylindrical shape. achieve

The core 300 consists of a cylindrical core body 310 and a hollow core extension 320 integrally formed at the bottom of the core body 310, and is coupled to the inside of the bobbin 210 and coil 220. ) is magnetized by a magnetic field.

The core body 310 is inserted into the bobbin 210, and its upper end is fixed to the housing 100 via the fastening member 102, and an armature insertion groove 311 is formed on the lower side, forming a part of the armature 400. This is inserted.

The armature insertion groove 311 is formed by being recessed in a cylindrical shape at the lower end of the core body 310 and opens downward, and its inner circumferential surface forms a gap with the outer circumferential surface of the armature 400, and the bottom surface and the armature 400 are connected through the gap. Fuel flows between the upper ends of the.

Additionally, the core body 310 may have a recessed portion formed by recessing an outer peripheral surface adjacent to the bottom of the armature insertion groove 311 among the outer peripheral surfaces to concentrate magnetic force.

The core extension portion 320 is formed integrally with the lower end of the core body 310, has an outer peripheral surface that is stepped from the outer peripheral surface of the core body 310, is formed to have a larger diameter, and is inserted into the chamber 25 of the holder 20. , the pole piece 120 is seated on the stepped surface with the outer peripheral surface of the core body 310.

This core extension 320 is formed by recessing a sealing member insertion groove 321 on the outer peripheral surface, and a ring-shaped sealing member 104 is inserted into the sealing member insertion groove 321.

In addition, the core extension portion 320 is formed so that its inner peripheral surface has an inner diameter larger than the inner diameter of the armature insertion groove 311, and may be provided with a space through which fuel flows between the core extension portion 320 and the armature guide 600, which will be described later.

As an example, a method of assembling the fuel shutoff valve 10 and mounting it on the holder 20 will be described with reference to FIG. 2 .

First, the coil assembly 200 is integrally provided with the case 110 and the pole piece 120 of the housing 100 by the molding part 130, and the core 300 is inserted into the bobbin 210. The core 300 may be assembled to the housing 100 as the fastening member 102 passes through the case 110 and is screwed to the core 300. At this time, the pole piece 120 is seated on the stepped surface connecting the core body 310 and the core extension portion 320.

Then, the armature 400 is inserted into the armature insertion groove 311 of the core 300, the valve part is placed inside the core 300, and the core extension part 320 is inserted into the chamber 25 and the pole piece. The protrusion 121 of (120) is located on the mounting part 24 of the holder 20, and the fastening member 102 is screwed to the mounting part 24 after passing through the insertion hole 122 of the protrusion 121. The fuel shutoff valve 10 may be mounted on the holder 20.

By having this arrangement, the fuel shutoff valve 10 is modularized and can be easily and conveniently mounted on the holder 20, and has the advantage of enabling easier repair and replacement and reducing the number of parts required for assembly and installation.

In addition, the lower end of the core 300 is directly inserted into the holder 20 and fixed, and the sealing member 104 is compressed and provided between the core extension 320 and the chamber 25, thereby causing vibration of the core 300. This reduces the load applied when assembling the holder 20 via the coupling member 103.

Below, the armature 400 and pilot 500 of the valve unit will be described in detail.

First, referring to FIGS. 4 to 8, the armature 400 is formed as an overall cylindrical shape, and is formed integrally with the armature body 410 inserted into the armature insertion groove 311 and the lower end of the armature body 410. It may include a fastening part 420.

The armature body 410 is inserted into the armature insertion groove 311 of the core 300 so that it can be lifted and moved upward when power is applied to the coil 220, and is provided between the core 300 when power is turned off. It is moved downward by the return spring 700.

The return spring 700 is provided between the core 300 and the armature to elastically support each, and is compressed by the armature 400 moving upward when power is applied to the coil 220.

The upper part of this return spring 700 is inserted into the seating groove 312 formed by recessing in the center of the bottom of the armature insertion groove 311 to fix the position, and the lower part is in the center of the upper side of the armature body 410. It is inserted into the spring insertion groove 412 formed by being depressed.

In addition, the armature body 410 is formed to be recessed into a cylindrical shape at the bottom to form a pilot insertion groove 411 opening downward, into which a portion of the pilot 500 is inserted.

In addition, the armature body 410 is provided with one or more first pilot passages 416 formed by penetrating from the outer peripheral surface to the inner peripheral surface of the pilot insertion groove 411 on one side, and may be provided with two or more first pilot passages 416. In this case, they may be provided at equal intervals in the circumferential direction.

This first pilot passage 416 is provided so that the space between the armature insertion groove 311 of the core 300 and the armature communicates with the space between the pilot insertion groove 411 of the armature 400 and the pilot 500. Reduces the pressure difference between the two. Accordingly, when power is applied to the coil 220 with the pilot 500 closing the discharge path 22, the initial upward movement of the armature 400 is facilitated.

The fastening portion 420 is formed in a hollow cylindrical shape and is integrally formed with the lower end of the armature body 410. The inner peripheral surface is formed extending from the inner peripheral surface of the pilot insertion groove 411, and a thread is formed on the outer peripheral surface to guide the armature. (600) may be screwed.

In addition, the fuel cutoff valve 10 is provided with a shock absorber 430 to absorb shock between the core 300 and the armature 400 and between the armature 400 and the pilot 500.

The shock absorber 430 passes through the interior of the armature 400 and protrudes upward and downward, elastically supports the core 300 and the pilot 500, and is injected into the internal space formed in the armature 400, for example. It can be prepared by insert injection.

The armature 400 forms an internal space in which a shock absorbing part 430 is provided, and the internal space is composed of a first receiving part 413, a second receiving part 414, and a connecting passage 415.

The first receiving portion 413 is formed by being recessed into a cylindrical shape on the upper side of the armature 400, and is provided in plural pieces and arranged at equal intervals in the circumferential direction with a spring insertion groove 412 at the center.

As an example, the drawing shows that the upper side of the armature 400 is recessed on both sides of the spring insertion groove 412 and is provided with two first receiving portions 413, but the present invention is not limited thereto.

The second accommodating part 414 is formed by being recessed into a cylindrical shape in the center of the lower side of the armature 400, and communicates with the first accommodating part 413 through a connecting passage 415.

The connection passage 415 is formed by recessing from the bottom of each first accommodating part 413 to the second accommodating part 414, and may be provided in plural pieces, and includes the first accommodating part 413 and the second accommodating part 414. ) connect.

And the shock absorber 430 is formed by injection into the first accommodating part 413, the second accommodating part 414, and the connecting passage 415 of the armature 400, and includes a core support member 431 and a pilot support. It consists of a member 434 and a connecting member 435.

The armature 400 moves upward due to the magnetic field formed when power is applied to the coil 220, and the pilot is provided with a core support member 431 to absorb shock when colliding with the core 300 and moves upward. A pilot support member 434 is provided to absorb shock when colliding with 500.

The core support member 431 is formed by injection into the first receiving portion 413 and is formed to protrude upward from the armature 400. As an example of the armature 400, a spring of the armature 400 is inserted as shown in the drawing. Two may be provided on both sides of the groove 412.

The upper side of the core support member 431 is arranged to face the bottom of the armature insertion groove 311, but is spaced apart from the armature insertion groove 311 at regular intervals. In addition, when power is applied to the coil 220 and the armature 400 moves upward, the core support member 431 elastically supports the bottom of the armature insertion groove 311 and forms a space between the core 300 and the armature 400. Absorbs shock.

The pilot support member 434 is injected into the second receiving portion 414 to form a cylindrical shape and is placed in the center of the lower end of the armature 400.

When power is not applied to the coil 220, this pilot support member 434 elastically supports the upper protrusion 520 formed on the upper side of the pilot 500 and closes the second pilot passage 540, which will be described later. Additionally, the pilot support member 434 is spaced apart from the upper end of the pilot 500 when power is applied to the coil 220 and the armature 400 moves upward.

As the connecting member 435 is formed by injection into the connecting passage 415, the core support member 431 and the pilot support member 434 are formed as one piece, making insert injection of the shock absorber 430 easy.

In addition, as the shock absorber 430 is composed of a core support member 431, a pilot support member 434, and a connection member 435, it is prevented from being separated from the armature 400.

In addition, referring to Figure 6, the core support member 431 is formed to protrude toward the upper side of the armature 400 and has a protrusion 432 that absorbs shock when colliding with the core 300, and the upper side of the armature 400. It is provided with a flange 433 formed to partially cover it.

The protrusion 432 is formed to protrude in a cylindrical shape from the upper side of the core support member 431 and absorbs shock when colliding with the core 300.

This core support member 431 is provided with protrusions 432 and is formed in a multi-stage shape on the upper side, thereby absorbing shock in stages when colliding with the core 300.

That is, when power is applied to the coil 220 and the armature 400 moves upward, the protrusion 432 primarily collides with the bottom of the armature insertion groove 311, causing impact along with the core support member 431. After the protrusion 432 is completely compressed, the upper side of the core support member 431 secondarily supports the bottom of the armature insertion groove 311, so that the upper side of the armature body 410 is attached to the core 300. Prevent collisions.

In particular, the protrusion 432 is formed to have a smaller diameter than the diameter of the core support member 431, and minimizes noise generated due to collision between the core support member 431 and the core 300 when the armature 400 moves upward. It is desirable to form it so that

For this purpose, the size of the protrusion 432 is preferably limited to a percentage value of the cross-sectional area of the protrusion 432 compared to the cross-sectional area of the armature 400 of 4% or more and 10.02% or less.

In addition, the flange 433 is provided on the upper outer peripheral surface of the core support member 431 to secure an area for elastically supporting the bottom surface of the armature insertion groove 311 of the core support member 431, and attaches the armature to the core 300. Prevents the upper side of the body 410 from colliding.

This flange 433 is formed in a ring shape on the outer peripheral surface of the upper end of the core support member 431 and protrudes outward in the radial direction to cover a portion of the upper end of the armature 400.

Hereinafter, the results of noise measurement experiments will be described for an example in which the protrusions 432 of the present invention are formed to a certain size and a comparative example in which the protrusions 432 are not formed or the protrusions 432 are formed to a size smaller than the predetermined size. do.

The noise measurement experiment measures the maximum value of the operating noise generated during the operation of opening and closing the hydrogen shutoff valve five times, and is conducted using three samples for each example and comparative example, and then the average value of the maximum value is obtained.

First, in the embodiment, a core support member 431 having a protrusion 432 is applied to the hydrogen shutoff valve, and the percentage value of the cross-sectional area of the protrusion 432 is 4.46% compared to the cross-sectional area of the armature 400. In this embodiment, In the noise measurement experiment, an average operating noise of 44.8 dB was measured.

In addition, Comparative Example 1 applies a core support member without protrusions to the hydrogen shutoff valve, and the operating noise of Comparative Example 1 was measured to be an average of 51.5 dB in a noise measurement experiment.

In addition, Comparative Example 2 applies a core support member having a protrusion with a percentage value of 0.55% of the cross-sectional area of the protrusion compared to the cross-sectional area of the armature to the hydrogen blocking valve, and Comparative Example 2 operates with an average value of 56.2 dB in the noise measurement experiment. Noise was measured.

In addition, Comparative Example 3 applies a core support member having protrusions in which the percentage value of the cross-sectional area of the protrusions compared to the cross-sectional area of the armature is 1.11% to the hydrogen blocking valve, and Comparative Example 3 operates with an average value of 52.9 dB in the noise measurement experiment. Noise was measured.

As a result, looking at the Example and Comparative Example 1, the hydrogen shutoff valve to which the core support member 431 with protrusions 432 is applied has reduced noise compared to the hydrogen shutoff valve to which the core support member without protrusions is applied. It has been confirmed.

In addition, looking at the Example and Comparative Examples 2 and 3, it was confirmed that noise was reduced when the percentage value of the cross-sectional area of the protrusion 432 compared to the cross-sectional area of the armature 400 was 4% or more compared to the case where it was less than 4%. In particular, when the percentage value of the cross-sectional area of the protrusion 432 compared to the cross-sectional area of the armature 400 is 4% or more, the noise is reduced compared to the standard value of 48 dB and the evaluation criteria are satisfied, thereby satisfying the desired noise condition.

Therefore, the size of the protrusion 432 is such that the percentage value of the cross-sectional area of the protrusion 432 compared to the cross-sectional area of the armature 400 is 4% or more, so that the noise generated during operation of the hydrogen shutoff valve satisfies the desired noise evaluation standard and the noise is reduced. can be reduced. And the size of the protrusion 432 is smaller than the size of the core support member 431, as the percentage value of the cross-sectional area of the protrusion 432 compared to the cross-sectional area of the armature 400 is less than 10.02%. The upper shape can be formed into a multi-stage structure.

Referring to FIG. 8, the pilot 500 is provided to reduce the pressure difference between the inflow path 21 side and the discharge path 22 side of the holder 20, and is inserted into the pilot insertion groove 411 to be able to move up and down. The lower end opens and closes the discharge passage 22 and is provided with a second pilot passage 540 that penetrates the interior in the vertical direction.

The pilot 500 is formed in a cylindrical shape and has a step 510 on the lower side of the outer circumferential surface supported by the armature guide 600.

The locking jaw 510 is a component that elevates the pilot 500. When the armature 400 moves upward, the inner end 610 of the armature guide 600 is caught and moves the pilot 500 together with the armature 400. It is configured to move upward.

In addition, the pilot 500 is provided with a second pilot passage 540 that penetrates in the vertical direction in the center, and the center portion of the upper side is formed to protrude upward to support the pilot support member 434 of the armature 400. It is provided with an upper projection 520 that supports.

The upper protrusion 520 is formed in a roughly cone shape to reduce the area in contact with the pilot support member 434, and is in close contact with the pilot support member 434 when the fuel cutoff valve 10 closes the discharge path 22. This closes the second pilot passage 540.

In particular, as the pilot support member 434 of the armature 400 elastically supports the upper protrusion 520, airtightness between the armature 400 and the second pilot passage 540 of the pilot 500 is improved.

When the armature 400 is moved downward, the pilot support member 434 presses the top of the upper protrusion 520 and the second pilot passage 540 is closed, and the coil 220 When power is applied and the armature 400 moves upward, the pilot support member 434 is separated from the upper protrusion 520 and the second pilot passage 540 is opened.

Additionally, the pilot 500 has a packing accommodating portion 530 that is formed by being recessed into a ring shape on the lower side, and is provided with a ring-shaped packing 550 that is formed by insert injection into the packing accommodating portion 530.

The packing receiving portion 530 has an inner outer circumferential surface that is tapered to prevent the packing 550, which is formed by injection into the inside, from being separated, and the radial thickness of the packing 550 decreases downward. do.

In particular, the pilot 500 may be provided with a through hole 531 formed to penetrate from the bottom of the packing accommodating portion 530 to the upper side of the pilot 500. The through holes 531 may be provided in plural numbers and may be provided in a circumferential direction. It may be provided spaced apart at equal intervals. Additionally, the pilot 500 may be provided with a support member 551 that is formed by insert injection into the through hole 531 and is integrally formed with the packing 550.

The through hole 531 may be composed of a large diameter portion and a small diameter portion, and the small diameter portion is disposed between the packing receiving portion 530 and the large diameter portion, and is provided with a support member 551 formed by injection into the through hole 531 to provide packing ( 550) is prevented from being separated or separated from the packing receiving portion 530.

The packing 550 is in close contact with the valve seat 27 protruding from the bottom surface 26 of the chamber 25 formed in the holder 20, and is packed when the fuel cutoff valve 10 closes the discharge passage 22. (550) elastically supports the valve seat 27, thereby improving airtightness between the pilot 500 and the discharge path 22 of the holder 20.

The armature guide 600 is formed in a hollow cylindrical shape and is fastened to the fastening portion 420 of the armature 400 to restrain the pilot 500 to the armature 400.

This armature guide 600 has an upper inner peripheral surface that can be screwed to the outer peripheral surface of the fastening portion 420, and an inner end portion 610 that protrudes radially inward from the lower end and supports the locking protrusion 510 of the pilot 500. ) is provided.

Accordingly, the pilot 500 is inserted into the pilot insertion groove 411 of the armature 400 to enable elevation, and its downward movement is restricted by the armature guide 600 fastened to the lower side of the armature 400.

To be more specific, the pilot 500 can move upward until the upper protrusion 520 comes into close contact with the pilot support member 434 of the armature 400, and the stopping protrusion 510 of the armature guide 600 It can be moved downward until it is seated on the inner end 610. Then, as the armature 400 moves upward, the inner end 610 of the armature guide 600 is caught by the locking protrusion 510, causing the pilot 500 to also move upward, and as the armature 400 moves downward. The pilot support member 434 presses the upper protrusion 520 and moves the pilot 500 downward as well.

Below, the operating structure of the fuel shutoff valve 10 will be described with reference to FIGS. 9 to 11.

Figure 9 shows a first state in which the fuel shutoff valve 10 closes the discharge path 22, and Figure 11 shows a third state in which the fuel shutoff valve 10 opens the discharge path 22. Figure 10 shows the second state, which is an intermediate process in which the fuel shutoff valve 10 progresses from the first state in which the discharge path 22 is closed to the third state in which the discharge path 22 is opened.

As shown in FIG. 9, when power is cut off to the coil 220, both the armature 400 and the pilot 500 maintain a downward movement state due to the supply pressure.

That is, the return spring elastically supports the armature 400 toward the discharge path 22, and the self-weight of the armature 400 and the pilot 500 is applied to move the armature 400 downward, and the pilot support member 434 The pilot 500 is supported downward by pressing the upper protrusion 520 and the pilot 500 closes the discharge passage 22, so that fuel is not supplied to the discharge passage 22.

Here, the pilot support member 434 elastically supports the upper protrusion 520 of the pilot 500 to close the second pilot passage 540, and the packing 550 elastically supports the valve seat 27 to provide a discharge path. Close (22).

In addition, a portion of the fuel is in the space between the inner peripheral surface of the core extension 320 and the outer peripheral surface of the armature guide 600 in the inflow path 21, and the inner peripheral surface of the armature insertion groove 311 and the outer peripheral surface of the armature body 410. It may flow into the gap, the space between the bottom of the armature insertion groove 311 and the upper side of the armature. Accordingly, the pressure difference between the upper and lower sides of the armature 400 is reduced, and the armature 400 can be easily moved upward by the magnetic field.

Additionally, fuel may flow between the pilot insertion groove 411 and the outside of the pilot 500 through the first pilot passage 416, and is not supplied to the second pilot passage 540 and the discharge passage 22. .

10 shows that power is applied to the coil 220, and in FIG. 9, only the armature 400 moves upward, but the inner end 610 of the armature guide 600 is supported on the locking jaw 510 of the pilot 500. The state in which it moves upward until it is shown is shown.

As the armature guide 600 moves partially upward, the pilot support member 434 is spaced apart from the upper protrusion 520 and opens the second pilot passage 540.

Accordingly, a portion of the fuel is discharged to the discharge passage 22 through the second pilot passage 540, and the pressure difference between the upper and lower sides of the pilot 500 is reduced, allowing the pilot 500 to easily move upward by the magnetic field. It becomes a state.

Next, in Figure 11, as the armature 400 moves further upward due to the magnetic field, the inner end 610 of the armature guide 600 moves the pilot 500 upward, and the armature 400 and the pilot 500 The state in which everything has moved upward is shown. At this time, the packing 550 of the pilot 500 is separated from the valve seat 27, the fuel cutoff valve 10 is opened, and the fuel in the inflow passage 21 is discharged to the discharge passage 22.

Then, the armature 400 moves upward so that the core support member 431 collides with the core 300, and the protrusion 432 of the core support member 431 absorbs the shock and is compressively deformed, and the core support member ( The upper side of 431) supports the bottom of the armature insertion groove 311 to prevent the upper side of the armature body 410 from colliding with the core 300.

According to embodiments of the present invention having this shape and structure, the elastic member is disposed on the upper part of the armature, and there is no need to place any special components on the radial outer side of the armature, so the radial size of the armature is reduced to save space. It has the advantage of being able to be used efficiently.

The bar includes an armature guide that is coupled to the armature and blocks the pilot from leaving, and a locking jaw whose lower end is supported by the armature guide. The advantage is that the pilot, armature, and armature guide can be easily assembled or disassembled and are combined more firmly. there is.

In addition, since it includes a shock absorber and packing, it has the advantage of preventing damage caused by collision of the armature or pilot and preventing vibration and noise.

In the above, even though all the components constituting the embodiment of the present invention have been described as being combined or operated in combination, the present invention is not necessarily limited to this embodiment. That is, as long as it is within the scope of the purpose of the present invention, all of the components may be operated by selectively combining one or more of them.

The above description is merely an illustrative explanation of the technical idea of the present invention, and various modifications and variations will be possible to those skilled in the art without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

10: Fuel shutoff valve 20: Holder
21: inlet 22: outlet
100: housing 101: terminal
104: sealing member 110: case
120: Pole piece 130: Molding part
200: coil assembly 300: core
310: Core body 311: Armature insertion groove
312: Seating groove 320: Core extension part
321: Sealing member insertion groove 400: Armature
410: Armature body 411: Pilot insertion groove
412: Spring insertion groove 413: First receiving portion
414: second receiving portion 415: connection passage
416: first pilot flow path 420: fastening part
430: Shock absorber 431: Core support member
432: Protrusion 433: Flange
434: pilot support member 435: connection member
500: Pilot 510: Stopper
520: Upper protrusion 530: Packing receiving portion
540: Second pilot Euro 550: Packing
600: Armature guide 610: Medial end
700: return spring

Claims (9)

In the fuel cutoff valve installed on a holder having an inflow path and an outlet path, and opening and closing the discharge path,
a core that is coupled to the inside of a bobbin around which a coil that generates a magnetic field is wound when power is applied and is magnetized by the magnetic field of the coil;
an armature that is inserted into an armature insertion groove formed to be open to the lower side of the core and is raised and lowered by the magnetic field of the coil;
a pilot that is inserted into a pilot insertion groove formed to open to the lower side of the armature so as to be capable of being lifted and lowered and is restrained by the armature to open and close the discharge passage; and
It includes a shock absorbing part that passes through the interior of the armature and protrudes toward the upper and lower sides and elastically supports the core and the pilot,
The shock absorbing part includes a core support member that is formed to protrude upward from the armature and elastically supports the bottom surface of the armature insertion groove,
The core support member is,
a protrusion protruding from the upper side of the core support member; and
A flange protrudes from the outer peripheral surface of the upper end of the core support member and is formed to cover a portion of the upper end of the armature,
When the core support member collides with the core, the protrusion is primarily supported by the core to absorb shock, and the flange is secondarily supported to absorb shock, thereby creating a fuel cutoff valve that separates the core from the armature. .
According to claim 1,
The amateur said,
A first receiving portion formed by being recessed into a cylindrical shape on the upper side;
a second receiving portion formed by being depressed in a cylindrical shape at the center of the lower side; and
a connecting passage connecting the first accommodating part and the second accommodating part;
A fuel shutoff valve characterized by having a.
According to claim 2,
A fuel cutoff valve, wherein the shock absorbing part is formed by injection into the first accommodating part, the second accommodating part, and the connecting passage of the armature.
According to claim 3,
The core support member is formed in the first receiving portion,
The shock absorbing part,
a pilot support member formed in the second receiving portion to elastically support an upper protrusion formed on an upper side of the pilot; and
a connecting member formed in the connecting passage and integrally formed with the core supporting member and the pilot supporting member;
A fuel shutoff valve further comprising:
delete delete According to claim 1,
a return spring disposed between the core and the armature to support the armature toward the discharge path;
A fuel shutoff valve further comprising:
According to claim 7,
The fuel shutoff valve is characterized in that the armature is formed by being recessed in the center of the upper side and has a spring insertion groove into which a portion of the return spring is inserted.
According to claim 1,
The core has a core extension formed in a hollow shape at a lower end to be inserted into a chamber formed in the holder,
The fuel cutoff valve is formed in a ring shape and further includes a sealing member that is inserted into a sealing member insertion groove formed on an outer peripheral surface of the core extension portion and supports an inner peripheral surface of the chamber.