KR20230065629A - Magnetic Sealing Type Air Cut-off Valve - Google Patents

Abstract

A magnetic sealing-type air cutoff valve (1) of the present invention includes a permanent magnet (30) generating a valve closing direction magnetic force (F) restricting a valve disk (41) positioned in an internal stepped cross section structure of a valve housing (20) having an air port inlet to move to an actuator shaft (51) as a vertical direction magnetic force or a horizontal direction magnetic force to offset the effect of stack negative pressure (P) or external vibration (V) by the magnetic force to improve air cutoff performance by maintaining the lip (43a) shape sealing performance of a sealing member (43). Specifically, a fixing structure is formed below or on the side of the valve disk (41) to maintain a fully closed state until valve opening while magnet detachment by a valve opening operation is prevented to maximize air cutoff performance.

Description

Magnetic Sealing Type Air Cut-off Valve

The present invention relates to an air shutoff valve, and more particularly, to a magnetic airtight type air shutoff valve that cancels the influence of external vibration or pressure in a valve opening direction with magnetic force.

In general, a FCEV (Fuel Cell Electric Vehicle) vehicle generates power through a reaction between hydrogen and oxygen, and generates power generated by a fuel cell stack that generates water (steam) and heat after the reaction as a driving force.

In particular, a fuel cell electric vehicle (FCEV) vehicle generates electricity from a fuel cell stack through a chemical reaction between air and hydrogen in the stack only when electricity generation is required.

Therefore, the fuel cell stack is provided with an air cut-off valve to prevent unnecessary reactions caused by diffusion of external air into the stack through an air supply pipe and an air discharge pipe in an operation stop state, and the air A shut-off valve prevents degradation of stack durability.

To maintain this performance, the air shutoff valve applies an airtight structure to increase the airtight performance, and the airtight structure is required by combining a sealing member attached to the valve disc and a special shaped lip structure formed thereon. air barrier performance is satisfied.

Domestic registered patent KR 10-1884533 B1

However, the air shutoff valve maintains the valve closed state by using a combination of the load torque of the motor (ie, cogging torque * gear ratio) and the friction force of each rotating part as a valve holding force (ie, motor cogging torque * gear ratio + friction force).

As a result, even if the existing sealing member with a special shape lip structure satisfies the air blocking performance as a design condition, the lip portion may fall slightly from the seating surface of the housing due to external forces such as pressure or vibration inside the stack over time, or surface pressure This is weakening, leading to a weakening of confidentiality.

In particular, in the air shutoff valve, the negative pressure generated on the stack side pushes the valve (ie, the valve disc) or the restraining torque of the motor can be released due to external vibration. This phenomenon causes the valve to open slightly (ie, the valve disc to open). As a result, it is impossible to maintain airtight performance only with the specially shaped lip of the sealing member, and accordingly, it is impossible to block air flowing into the stack.

Therefore, in view of the above, the present invention improves air blocking performance by maintaining airtight performance of the lip shape of the sealing member by canceling the influence of external vibration or pressure in the valve opening direction with magnetic force, and in particular, at the lower or side portion of the valve disc An object of the present invention is to provide a magnetic airtight type air shutoff valve in which air blocking performance is maximized by maintaining a completely closed state until the valve opens in a state in which the separation of the magnet due to the valve opening operation is prevented by forming a fixed structure.

An air shutoff valve of the present invention for achieving the above object is a housing port having an internal stepped cross-sectional structure formed at an air port inlet, a valve disc positioned on the internal stepped cross-sectional structure to open and close the air port inlet, and the valve It is characterized in that a permanent magnet is included to maintain the closed state of the disk by magnetic force in the valve closing direction.

As a preferred embodiment, the valve closing direction magnetic force is divided into a vertical magnetic force formed at the lower part of the valve disc or a horizontal magnetic force formed at the side of the valve disc.

In a preferred embodiment, the vertical direction magnetic force is generated in the inner wall portion of the port inlet positioned below the valve disc among the inner wall portion of the port inlet and the inner wall portion of the valve position forming the inner stepped cross-sectional structure.

As a preferred embodiment, the inner wall portion of the port inlet forms a lower step coupled to the permanent magnet, and the lower step has a cut-out structure formed by cutting an upper portion of the inner wall portion of the port inlet.

As a preferred embodiment, the horizontal direction magnetic force is generated in the inner wall portion of the valve inlet located on the side of the valve disk among the inner wall portion of the port inlet and the inner wall portion of the valve position forming the inner stepped cross-sectional structure.

As a preferred embodiment, the valve inlet inner wall portion forms a side groove coupled to the permanent magnet, the side groove is a side groove structure formed by being dug into a side surface of the valve inlet inner wall portion, and the side groove structure is formed by the permanent magnet. It is spaced apart from the valve disc at intervals.

In a preferred embodiment, the valve disc forms a connecting portion with the actuator shaft as a rotation center at a fixed end of the disc, and a free end of the disc facing the permanent magnet on the opposite side of the fixed end of the disc.

As a preferred embodiment, the valve disc is wrapped with a sealing member, and the sealing member has a lip that is in close contact with the upper surface of the inner wall portion of the port inlet of the internal stepped cross-sectional structure.

In a preferred embodiment, the magnetic force in the valve closing direction is set to be greater than the pressure in the valve opening direction applied to the valve disc or the magnitude of external vibration and smaller than the motor torque of the drive unit that opens and closes the valve disc.

The magnetic airtight type air shutoff valve of the present invention implements the following actions and effects.

First, it is possible to implement an air shutoff valve with reinforced airtight performance of a sealing member by maintaining a completely closed state until the valve is opened by the magnetic force of a permanent magnet. Second, it is possible to maintain stable air blocking performance of the air blocking valve by self-reinforcing the lip tightness performance of the sealing member that satisfies the air blocking performance design condition as a design condition. Third, the durability of the stack is increased even under negative stack pressure or external vibration as the attraction force by the permanent magnet pulls the magnetic valve disc. Fourth, the permanent magnet can be easily applied to the air shut-off valve by being assembled with the valve by press-fitting, bonding, injection, etc. Fifth, since the permanent magnet forms a magnetic force generation position on the lower part or side of the valve disc, the valve opening operation can be performed without the magnet separation phenomenon. Sixth, even if an external force is generated, the air shutoff valve's air blocking performance is maximized by maintaining a tightly closed state at all times until the controller commands the valve to open, resulting in stable operation of the FCEV (Fuel Cell Electric Vehicle) and performance improvement, greatly improving the marketability of the vehicle. Improved.

1 is a block diagram of a magnetic airtight type air shutoff valve according to the present invention, FIG. 2 is a disposition of a permanent magnet applied to a valve housing according to the present invention, and FIG. 3 is a magnetic airtight type air shutoff valve according to the present invention. It is a diagram showing the relationship between the magnetic force of the permanent magnet, the negative pressure of the stack and external vibration during opening and closing, and FIG. 4 is a modified example of the disposition of the permanent magnet applied to the valve housing according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying exemplary drawings, and since these embodiments can be implemented in various different forms by those skilled in the art as an example, the description herein It is not limited to the embodiment of

1 and 2 show the configuration of the air shutoff valve (1).

Referring to FIG. 1, the air shutoff valve 1 is composed of an opening/closing unit 10 that opens and closes an air inflow/output path and a driving unit 50 that generates power to operate the opening and closing unit 10, and the opening/closing unit (10) includes a permanent magnet (30).

In particular, the permanent magnet 30 suppresses the valve opening direction pressure P and/or external vibration V with the valve closing direction magnetic force F (see FIG. acts to keep it closed. In this case, the valve disc 41 is made of metal or a magnetic material and forms an attractive force with the permanent magnet 30 .

Therefore, the air shutoff valve 1 is a self-tight airtight type air shutoff valve that improves air shutoff performance by preventing micro-opening of the valve even when pressure or external force inside the fuel cell stack is generated using magnetic force in a fuel cell electric vehicle (FCEV). characterized by

Specifically, the opening and closing part 10 is composed of a valve housing 20, a permanent magnet 30 and a valve 40.

For example, the valve housing 20 includes a housing port 21 through which air is introduced, and a lower step 23 formed in the housing port 21 . The permanent magnet 30 is seated on the lower step 23 and integrated with the housing port 21 .

In particular, the permanent magnet 30 has a certain strength of magnetic force, and the strength of the magnetic force is smaller than the driving torque of a motor (not shown) constituting the actuator of the drive unit 50, and at the same time, the external force generated by pressure or vibration inside the stack set larger than the size.

For example, the valve 40 includes a valve disc 41 and a sealing member 43.

In particular, in the valve disc 41, the drive unit 50 has a disc fixed end connected to the actuator shaft 51 and the opposite side as a disc free end, and the disc free end is a port inlet of the internal stepped cross-sectional structure of the housing port 21 A valve position extending the air inlet at the top of the inner wall portion is positioned toward the inner wall portion.

Therefore, the valve disc 41 opens the valve of the opening/closing part 10 by moving the free end of the disc 41 upward in the stepped cross-sectional structure inside the housing port 21 by clockwise rotation with the fixed end of the disc as the rotation center. In this case, the counterclockwise rotation forms the closing of the valve of the opening and closing part (10).

In addition, the sealing member 43 is made of rubber or polyurethane material and surrounds the valve disc 41, and has an internal stepped cross-sectional structure of the housing port 21 at the free end of the valve disc 41. It is located above the permanent magnet 30 by being in close contact with the upper surface of the inner wall of the inlet of the medium port.

In particular, the sealing member 43 forms a lip 43a, and the lip 43a forms a protruding rim shape on the lower surface of the sealing member 43 and is a special shape lip structure that is widened outward to block air required. secures performance.

Specifically, the driving unit 50 is connected to the valve 40 (ie, the valve disc 41) of the opening and closing unit 10 by an actuator shaft 51, and the actuator shaft 51 opens/closes the valve of the ACV controller It is connected to a motor (not shown) that rotates with a signal (see FIG. 3) and rotates forward/reversely in the motor rotation direction. In this case, the drive unit 50 may include a reducer between the motor and the actuator shaft 51 to increase motor torque.

Referring to FIG. 2, the valve housing 20 has two housing ports 21 equipped with lower steps 23, and each of the two housing ports 21 uses the lower steps 23 to permanently A magnet 30 is positioned. In this case, the housing port 21 is exemplified as a square shape, but the shape may be formed in a circular shape.

In particular, the housing port 21 forms an air port inlet having an internal stepped sectional structure with an inner wall of the port inlet and an inner wall of the valve position, the inner wall of the port inlet has a step difference from the inner wall of the valve position, and the inner wall of the valve position has a valve 40 ) is formed as a seating portion at the free end of the In this case, the free end of the valve 40 is the disk free end of the valve disk 41 that is not connected to the drive unit 50 .

In addition, the lower step 23 is made of a top cutout structure in which the inner wall of the port inlet is cut downward from the inside stepped cross-section structure of the housing port 21, so that the upper surface of the permanent magnet 30 seated on the top cutout structure is the port It forms the upper surface of the inner wall of the inlet.

Therefore, the valve housing 20 generates the valve closing direction magnetic force F (see FIG. 3) as a vertical magnetic force in a state where the permanent magnet 30 is located below the valve disc 41, and the vertical magnetic force is formed by the vertical arrangement of the permanent magnet 30 and the valve disc 41.

Meanwhile, FIG. 3 shows open and closed states of the air shutoff valve 1 . As shown, in the air shutoff valve 1, the valve 40 is opened by driving the motor of the driving unit 50 by the valve open signal of the ACV controller, and the motor of the driving unit 50 by the valve closing signal of the ACV controller. Stopping causes valve 40 to close and remain closed.

Referring to the valve open state as an example, the valve disc 41 is opened by the driving torque of the drive unit 50 greater than the magnetic force of the permanent magnet 30, thereby opening the air inlet of the valve housing 20.

On the other hand, referring to the valve closed state, the valve disk 41 is positioned above the inner wall portion of the port inlet formed in the housing port 21 of the valve housing 20 to form a closed state, and at the same time, the sealing member 43 The air inlet of the valve housing 20 is sealed by bringing the lip 43a into close contact with the upper part of the inner wall of the port inlet.

In this sealed state, the valve disc 41 is continuously subjected to the valve opening direction pressure P and/or external vibration V from the air port inlet side of the valve housing 20, so that the port inlet of the housing port 21 A fine vibration is formed on the inner wall.

However, the permanent magnet 30 generates a valve closing direction magnetic force F greater than the valve opening direction pressure P and/or external vibration V at the upper portion of the inner wall portion of the port inlet, and the disk free end of the valve disc 41 By continuously pulling the part, the valve disc 41 can remain sealed even in the state of receiving the valve opening direction pressure P and/or external vibration V transmitted from the air port inlet side of the valve housing 20. there is.

Meanwhile, FIG. 4 shows that the permanent magnet 30 is changed in position in the valve housing 20 .

As shown, the valve housing 20 forms a side groove 25 with an inner wall portion of the valve position formed above the inner wall portion of the port inlet of the internal stepped cross-sectional structure of the housing port 21, and the side groove 25 is Since the side groove structure is formed on the side of the inner wall of the valve position, the side of the permanent magnet 30 seated in the groove of the side coincides with the side of the inner wall of the valve position.

In particular, the permanent magnet 30 forms a side gap K with the free end of the disk of the valve disk 41, so that the sealing member 43 has a side surface separated from the permanent magnet 30, and the lip 43a is in the housing port (21) forms an airtight seal by adhering to the upper surface of the inner wall of the port inlet.

Therefore, the valve housing 20 generates the valve closing direction magnetic force F (see FIG. 3) as a horizontal magnetic force in a state where the permanent magnet 30 is located on the side of the valve disc 41, and the horizontal magnetic force is formed by the horizontal arrangement of the permanent magnet 30 and the valve disc 41.

Therefore, the permanent magnet 30 holds the valve in a horizontal direction orthogonal to the valve opening direction pressure P and/or external vibration V transmitted perpendicularly to the valve disc 41 in the valve closed state of FIG. 3 . By pulling, it acts to maintain the closed state of the valve disc 41.

As described above, the magnetic airtight type air shutoff valve 1 according to the present embodiment has a valve disc 41 located in the stepped cross-sectional structure inside the valve housing 20 having an air port inlet and moved by an actuator shaft 51 By including a permanent magnet 30 that generates a vertical magnetic force or a horizontal magnetic force in the valve closing direction magnetic force F to be restrained, the sealing member cancels the effect of the stack negative pressure P or external vibration V by magnetic force. Maintaining airtightness of the shape of the lip 43a of (43) improves air blocking performance, and in particular, by forming a fixed structure at the bottom or side of the valve disk 41, the valve in a state in which the separation of the magnet due to the valve opening operation is prevented. It is possible to maximize air blocking performance by maintaining a completely closed state until opening.

1: air shutoff valve
10: opening and closing part
20: valve housing 21: housing port
23: lower step 25: side groove
30: permanent magnet 40: valve
41: valve disc 43: sealing member
43a: lip
50: driving unit
51: actuator shaft

Claims (15)

A housing port formed with an internal stepped cross-sectional structure at the air port inlet,
A valve disk located on the inner stepped cross-sectional structure to open and close the air port inlet, and
A permanent magnet that maintains the closed state of the valve disc with magnetic force in the valve closing direction
An air shutoff valve characterized in that it is included.
The method according to claim 1, wherein the valve closing direction magnetic force
The air shutoff valve, characterized in that divided into vertical magnetic force formed at the lower part of the valve disk or horizontal magnetic force formed at the side of the valve disk.
The method according to claim 2, wherein the vertical direction magnetic force
The air shutoff valve, characterized in that generated in the port inlet inner wall portion located below the valve disk among the port inlet inner wall portion and the valve position inner wall portion forming the inner stepped cross-sectional structure.
The air shut-off valve according to claim 3, wherein the inner wall of the port inlet forms a lower step coupled to the permanent magnet.
The air shut-off valve according to claim 4, wherein the lower step has a cut-out structure.
[6] The air shutoff valve according to claim 5, wherein the cut-out structure is formed by cutting an upper portion of the inner wall portion of the port inlet.
The method according to claim 2, wherein the horizontal direction magnetic force
The air shut-off valve, characterized in that generated in the inner wall portion of the valve inlet located on the side of the valve disk among the inner wall portion of the port inlet and the inner wall portion of the valve position forming the internal stepped cross-sectional structure.
[8] The air shutoff valve according to claim 7, wherein the inner wall of the valve inlet forms a side groove coupled to the permanent magnet.
[9] The air shutoff valve according to claim 8, wherein the side groove has a side groove structure dug into a side surface.
10. The air shutoff valve according to claim 9, wherein the side groove structure is formed by being dug into the side surface of the inner wall portion of the valve inlet.
The air shutoff valve according to claim 10, wherein the side groove structure is such that the permanent magnet is spaced apart from the valve disc at a lateral interval.
The method according to claim 1, wherein the valve disc forms an actuator shaft and a connecting part with a disc fixing end as a rotation center,
The air shutoff valve, characterized in that the opposite side of the fixed disk end is formed as a free end of the disk facing the permanent magnet.
The method according to claim 1, wherein the valve disk is wrapped with a sealing member,
The air shutoff valve, characterized in that the sealing member is in close contact with the upper surface of the inner wall portion of the port inlet of the internal stepped cross-sectional structure.
[14] The air shut-off valve of claim 13, wherein the sealing member has a lip in close contact with an upper surface of the inner wall of the port inlet.
The method according to claim 1, wherein the valve closing direction magnetic force
The air shut-off valve, characterized in that set smaller than the motor torque of the driving unit for opening and closing the valve disk while greater than the magnitude of the valve opening direction pressure or external vibration applied to the valve disk.

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