JP2003240143A - Two-way valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-manufacturing cost and inexpensively-supplied two- way valve in which the number of components is reduced and an assembling process is simplified. <P>SOLUTION: A second valve element 4 for opening and closing a flow channel 25 formed in a first valve element 2 is energized by an energizing means 5 mounted between the second valve element 4 and an inner face of a valve case 1. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has two inlets and outlets, and when a pressure difference between these inlets and outlets reaches a predetermined pressure,
2 configured to open the valve regardless of positive / negative pressure
Regarding the directional valve, for example, it is installed between a fuel tank and a canister of an automobile, etc., and opens the valve when the inside of the fuel tank becomes higher than a predetermined pressure range and when it becomes lower than the predetermined pressure range. The present invention relates to a two-way valve that is preferably used as a check valve that keeps the inside at a predetermined pressure.

[0002]

2. Description of the Related Art A two-way valve, which is usually called a check valve, is mounted between a fuel tank of an automobile and a canister, and this check valve is installed when the inside of the tank is in a positive pressure state above a predetermined value. When the tank is opened to release the pressure in the tank to the canister, the check valve is opened to cancel the depressurized state in the tank even when the depressurized state in the tank becomes a predetermined value or less.

Conventionally, as this check valve, a two-way valve disclosed in Japanese Patent Laid-Open No. 9-60744 has been known.

In this two-way valve, as shown in FIGS. 5 and 6, a case body a to which a bifurcated pipe a1 connected to a fuel tank is integrally connected, and a pipe b1 connected to a canister are integrally formed. The valve case c is composed of a connected lid b, a bottomed cylindrical valve body d, and a valve seat cap e fitted and fixed to the valve body d. The valve case c is arranged in the valve case c. The first valve body f and the first valve body f
It is composed of a coil spring g for urging the first valve body f, a second valve body h housed in the first valve body f, and a coil spring i for urging the second valve body h.

A ring-shaped first valve seat a3 protruding into the case is formed at the first inlet / outlet a2 provided in the case body a of the valve case c, and a first valve seat a3 provided in the lid b is provided. A ring ridge b3 is provided around the second entrance / exit b2 so as to support one end of the coil spring g.

A dome-shaped valve head d1 protruding outward is formed on the bottom wall of the valve body d constituting the first valve body f, and a flow opening d2 is formed in the valve head d1. ing. Further, the valve seat cap e that constitutes the first valve body f also has a valve body d.
The flow port e2 is formed in the wall portion that closes the open end of the, and the inner peripheral edge of the flow port e2 is the second valve seat e3. The first valve body f is attached to the first inlet / outlet a2 side by the coil spring g arranged such that one end is supported by the ring protrusion b and the other end is in contact with the valve seat cap e. It is energized.

The second valve body h is of a tubular shape having a substantially dome-shaped tip end portion, and the dome-shaped tip portion serves as a valve head h1. The second valve body h is movably arranged in the first valve body f, and
A coil spring i arranged in the valve body f biases the second valve seat e3.

In this two-way valve, as shown in FIG. 6, the valve head h1 of the second valve body h is always the second one as shown in FIG.
The valve head d1 of the first valve body f abuts the first valve seat a3 in a state where the first valve body f is in contact with the valve seat e3 and the inner space of the first valve body f is closed. It is closed in a closed state.

In this state, the pressure in the fuel tank rises,
When the first inlet / outlet a2 side becomes higher than the second inlet / outlet b2 side by a predetermined pressure or more, as shown in FIG. 7, the pressure from the first inlet / outlet a2 side causes the first valve body f to move to the coil spring g.
Moves against the biasing force of the first valve body f and the valve head d1 of the first valve body f moves to the first position.
The first inlet / outlet a2 opens apart from the valve seat a3, and the pressure on the fuel tank side passes from the first inlet / outlet a2 between the outer peripheral surface of the first valve body f and the inner peripheral surface of the valve case c, and further to the second It is opened to the canister side through the doorway b2.

On the contrary, when the pressure inside the fuel tank is reduced and the second inlet / outlet b2 side becomes higher than the first inlet / outlet a2 side by a predetermined pressure or more, the pressure from the second inlet / outlet b2 side is increased as shown in FIG. , The second valve body h moves against the biasing force of the coil spring i, the valve head h1 of the second valve body f separates from the second valve seat e3, the flow port e2 opens, and the pressure on the canister side increases. The fuel tank passes from the second inlet / outlet b2 through the flow outlet e2, further between the outer peripheral surface of the second valve body h and the inner peripheral surface of the first valve body f, and sequentially passes through the flow outlet d2 and the first inlet / outlet a2. And the depressurized state in the fuel tank is released.

Thus, according to this two-way valve,
When the inside of the fuel tank is pressurized or depressurized beyond the specified pressure range, the valve is opened to release the positive or negative pressure inside the tank to the canister side, and the inside of the fuel tank is always kept within the specified pressure range. It is something that can be retained.

[0012]

However, this conventional two-way valve has a large number of parts and a complicated assembly process, which causes a high manufacturing cost. That is, as shown in FIG. 5, this two-way valve includes a case body a, a lid body b, a valve body d, a valve seat cap e, a coil spring g, a second valve body h, and a coil spring i.
In order to assemble the parts, the second valve body h and the coil spring i are first placed in the valve body d, and the valve seat cap e is adhesively fixed to the valve body d to attach the second valve body h. The first assembling step of assembling the first valve body f in which the first valve body f and the coil spring g are arranged in the case body a, and the lid body b is bonded and fixed to the case body a. A two-step assembly process including the assembly process is required.

The present invention has been made in view of the above circumstances, and can reduce the number of parts, simplify the assembly process, and reduce the manufacturing cost.
An object is to provide a two-way valve that can be supplied at low cost.

[0014]

In order to achieve the above object, the present invention has a valve case having two entrances and exits provided opposite to each other, and a first valve seat formed at one entrance and exit, A first valve body movably disposed in the valve case and abutting a first valve seat provided at the one inlet / outlet to close the inlet / outlet; an inner surface of the first valve body and the valve case; And a first urging means for urging the first valve body toward the one inlet / outlet, and a second valve seat formed at one end of the first valve body. And a second valve body that abuts a second valve seat of the flow passage to close the flow passage, and the second valve body is disposed between the second valve body and the inner surface of the valve case. A second urging means for urging the second valve body toward the second valve seat of the flow passage, wherein the pressure on the one inlet / outlet side is the other. When the predetermined pressure becomes higher than the pressure on the inlet / outlet side, the first valve body moves against the urging force of the first urging means to open one of the inlets / outlets to increase the pressure to the other inlet / outlet side. When it escapes, and the pressure on the other inlet / outlet side becomes higher than the pressure on the one inlet / outlet side by a predetermined pressure,
The second valve body is configured to move against the urging force of the second urging means, open the flow passage, and release the pressure to one of the inlet and outlet sides through the flow passage. A two-way valve is provided.

That is, the two-way valve of the present invention is the first
The second valve body that opens and closes the flow passage formed in the valve body is configured to be biased by the biasing means disposed between the second valve body and the inner surface of the valve case. Unlike the case of urging the second valve body by urging means such as a coil spring in the first valve body, it is not necessary to provide the spring receiving seat in the first valve body. Therefore, it is not necessary to close the valve body by adhesively fixing the valve seat cap after arranging the second valve body and the coil spring in the valve body that constitutes the first valve body as in the above-mentioned conventional example. Then, the valve seat cap e in the above conventional example
The component corresponding to can be omitted.

Further, the assembling work is carried out first in the valve case.
The valve body, the second valve body, and the two biasing means are arranged to complete the one-step assembly process of only closing the valve case, and the two-step assembly process is required like the valve of the conventional example. The assembly process can be simplified as compared with the case of performing.

As described above, according to the two-way valve of the present invention, the number of parts can be reduced, the assembling process can be simplified, the manufacturing cost can be reduced, and the cost can be reduced. can do.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described more specifically by showing Examples of the present invention. 1 and 2
2 shows a two-way valve according to an embodiment of the present invention,
The two-way valve includes a valve case 1 including a case body 11 integrally connected with a pipe 11a connected to a fuel tank and a lid 12 integrally connected with a pipe 12a connected to a canister. A substantially cylindrical first valve body 2, a coil spring 3 (first urging means) for urging the first valve body 2, a second valve body 4 housed in the first valve body 2, It is configured with a coil spring 5 (second urging means) that urges the second valve body 4.

The case main body 11 constituting the valve case 1 is provided with a first inlet / outlet port 111 at the connecting portion of the pipe 11a, and the inner peripheral surface of the first inlet / outlet port 111 is formed into a tapered first valve seat. 112, and a step portion 113 (spring support portion) for supporting the end portion of the coil spring 5 is formed at the boundary portion between the first valve seat 112 and the pipe 11a. Further, a plurality of protrusions 114 along the axial direction are evenly provided on the inner peripheral surface of the case body 11. Two branch pipes 11b connected to a fuel cutoff valve attached to the fuel tank are further connected to the pipe 11a.

The lid 12 which constitutes the valve case 1 is provided with a second inlet / outlet 121 at the connecting portion of the pipe 12a, and the lid 12 is ultrasonically welded to the open end of the case body 11. This lid 1 is bonded and fixed by
The valve case 1 is constituted by 2 and the case body 11.

Next, the first valve body 2 is a substantially cylindrical valve body, and the hollow portion thereof forms a flow passage 21 with both ends open. In addition, a ring protrusion is formed at one end of the ring protrusion so that the peripheral wall of the hollow portion extends outward, and the outer peripheral surface of the ring protrusion is formed in a tapered shape. It is the valve head 22. The other end of the hollow portion is formed to have a slightly smaller diameter, and the inner peripheral edge portion of the other end formed to have the smaller diameter serves as the second valve seat 23. Further, a ring-shaped recess 24 that opens to the peripheral portion of the other end surface of the first valve body 2 is formed around the hollow portion, and one end of the coil spring 3 is supported in the ring-shaped recess 24. It is like this. Furthermore, on the inner peripheral surface of the hollow portion of the first valve body 2,
A plurality of protrusions 25 are evenly provided along the axial direction.

As shown in FIG. 2, the first valve body 2 is arranged in the valve case 1 with the valve head 22 facing the first inlet / outlet 111 side, and one end thereof is the ring-shaped recess 24. The second entrance 12 of the lid 12 supported inside
The coil spring 3 disposed in contact with the periphery of the first member 1 is urged toward the first inlet / outlet port 111. Since the ring-shaped recess 24 of the first valve body 2 is deeply recessed from the one end surface of the first valve body 2 to the vicinity of the wall portion of the other end,
One end of the coil spring 3 is stably supported in the ring-shaped recess 24, and the first valve body 2 does not tilt or fall due to the bias of the coil spring 3.

Next, the second valve body 4 is of a cylindrical shape whose tip is closed in a substantially dome shape, and this dome-shaped tip serves as a valve head 41. Further, from the peripheral portion of the second valve body 4 on the open end side, four projecting pieces 42 continuous from the outer peripheral surface of the second valve body 4 are evenly formed.

As shown in FIG. 2, the second valve body 4 has a valve head 4 in the flow passage 21 of the first valve body 2.
1 is arranged to be movable toward the second valve seat 23,
A coil spring, one end of which is supported inside each of the protrusions 42 of the second valve body 4, and the other end of which is supported by the step portion 113 (spring support portion) provided on the inner peripheral portion of the one entrance 111 of the valve case 1. 5, the second valve seat 23 is urged.

In this embodiment, the valve case 1 described above is used.
The case body 11 and the lid body 12, the first valve body 2,
In addition, the second valve body 4 is made of polyacetal resin having excellent fuel impermeability. In this case, these forming materials are not limited to polyacetal resin, and various resin materials can be used, but it is preferable that the material has excellent fuel impermeability.

Next, the operation of this two-way valve will be described. In this two-way valve, as shown in FIG. 2, the valve head 41 of the second valve body 4 is always in contact with the second valve seat 23, and the flow passage 21 ( With the inner space) closed, the valve head 22 of the first valve body 2 is
It abuts on the valve seat 112, and the first inlet / outlet 111 is closed in a closed state.

In this state, the pressure in the fuel tank rises,
When the pressure on the first inlet / outlet 111 side becomes higher than the second inlet / outlet 121 side by a predetermined pressure or more, as shown in FIG.
Due to the pressure from the inlet / outlet 111 side, the first valve body 2 moves against the biasing force of the coil spring 3, and the valve head 22 of the first valve body 2 is moved.
Is separated from the first valve seat 112 to open the first inlet / outlet port 111, and the air flow due to the pressure on the fuel tank side causes the first inlet / outlet port 111 to flow.
Through the outer peripheral surface of the first valve body 2 and the inner peripheral surface of the valve case 1 to the canister side through the second inlet / outlet 121, and the pressure in the fuel tank is released.

On the contrary, when the pressure inside the fuel tank is reduced and the second inlet / outlet 121 side becomes higher than the first inlet / outlet 111 side by a predetermined pressure or more, as shown in FIG.
The second valve body 4 moves against the biasing force of the coil spring 5 due to the pressure from the 21st side, the valve head 41 of the second valve body 4 separates from the second valve seat 23, and the first valve body 2 The flow passage 21 (hollow portion) of the second valve body 2 is opened, and the air flow due to the pressure on the canister side flows from the second inlet / outlet port 121 into the flow passage 21.
Passing through the outer peripheral surface of the first valve body 2 and the inner peripheral surface of the first valve body 2, flowing into the fuel tank through the first inlet / outlet 111, and the depressurized state in the fuel tank is eliminated.

Thus, according to this two-way valve,
Like the conventional two-way valve shown in FIGS. 5 to 8, when the inside of the fuel tank is pressurized or depressurized beyond a predetermined pressure range, the valve is opened to increase the positive or negative pressure in the tank. By opening to the canister side, the inside of the fuel tank can be constantly maintained within a predetermined pressure range.

In this case, in the two-way valve of this embodiment, the second valve body 4 for opening and closing the flow passage 21 formed in the first valve body 2 is provided in the second valve body 4 and the valve case 1. Since it is configured to be biased by the coil spring 5 disposed between the stepped portion 113 (spring support portion), a biasing means such as a coil spring is disposed in the first valve body 2. 2nd valve body 4
There is no need to provide a spring seat in the first valve body 2 as in the case of urging. Therefore, as in the conventional valve shown in FIGS. 5 to 8, after the second valve body h and the coil spring i are arranged on the valve body d that constitutes the first valve body f, the valve seat cap e is adhered and fixed. It is not necessary to close the valve body d, and in the two-way valve of this embodiment, the valve seat cap e in the conventional example is used.
The parts corresponding to are omitted.

In the assembly work, the first valve body 2, the second valve body 4, and the two coil springs 3 and 5 are arranged in the case body 11 which constitutes the valve case 1, and the cover body is attached to the case body 11. 12 is bonded and fixed by ultrasonic welding, and the case body 11 is closed by a one-step assembly process.
The assembly process can be simplified as compared with the case where the conventional valve shown in FIGS. 5 to 8 requires a two-step assembly process.

As described above, according to the two-way valve of this embodiment, the number of parts can be reduced, the assembling process can be simplified, the manufacturing cost can be reduced, and the cost can be reduced. A directional valve can be provided.

The two-way valve according to the present invention is not limited to the above embodiment, and each component such as the case body 1, the first valve body 2, the second valve body 4 and the urging means 3, 5 is used. The shape and the like can be appropriately changed, and other configurations can be variously changed without departing from the gist of the present invention. Further, the two-way valve of the present invention is preferably used as a check valve arranged between a fuel tank of an automobile and a canister, but its use is not limited to this and various containers are used. And other valves depending on the pressurization or depressurization in the closed space,
It can be suitably used as a valve for holding the pressure in various containers and other closed space portions within a certain range.

[0034]

As described above, according to the two-way valve of the present invention, the number of parts can be reduced, the assembling process can be simplified, and the manufacturing cost can be reduced. A two-way valve can be supplied inexpensively.

[Brief description of drawings]

FIG. 1 is an exploded sectional view showing a two-way valve according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which the two-way valve is closed.

FIG. 3 is a cross-sectional view showing the same two-way valve in a state in which one of the inlet and outlet sides is in a pressurized state so that the valve is opened.

FIG. 4 is a cross-sectional view showing a state in which the two-way valve is opened by the other inlet / outlet side being pressurized.

FIG. 5 is an exploded sectional view showing a conventional two-way valve.

FIG. 6 is a cross-sectional view showing a state where the two-way valve is closed.

FIG. 7 is a cross-sectional view showing a state in which the two-way valve is opened because one of the inlet and outlet sides is in a pressurized state.

FIG. 8 is a cross-sectional view showing a state in which the two-way valve is opened due to the other inlet / outlet side being pressurized.

[Explanation of symbols]

1 valve case 11 Case body 111 First doorway 112 1st valve seat 113 Step (Spring support) 12 Lid 121 Second doorway 2 First valve body 21 flow passage 22 valve head 23 Second valve seat 24 Ring-shaped recess 3 Coil spring (first urging means) 4 second valve 41 valve head 5 Coil spring (second biasing means)

Claims (6)

[Claims] 1. A valve case having two inlets and outlets provided to face each other, and a first valve seat formed at one of the inlets and outlets, and a valve case movably disposed in the valve case. The first valve body is provided between the first valve body and the inner surface of the valve case, the first valve body being in contact with a first valve seat provided at the inlet and outlet to close the inlet and outlet, and the first valve body A first urging means for urging toward one of the inlets and outlets, a flow passage provided in the first valve body and having a second valve seat at one end, and a second valve seat of the flow passage. Second contact to close the flow passage
A valve body, and a second urging means disposed between the second valve body and the inner surface of the valve case, for urging the second valve body toward the second valve seat of the flow passage. When the pressure on the one inlet / outlet side becomes higher than the pressure on the other inlet / outlet side by a predetermined pressure, the first valve body moves against the urging force of the first urging means, When one of the inlet / outlet ports is opened to release the pressure to the other inlet / outlet side, and when the pressure on the other inlet / outlet side becomes higher than the pressure on the one inlet / outlet side by a predetermined pressure, the second valve body causes the second valve body to A two-way valve configured to move against an urging force of an urging means to open the flow passage and to release a pressure through the flow passage to one of the inlet and outlet sides. 2. The first valve body, wherein a valve head that abuts against the first valve seat is formed at one end of a substantially cylindrical body, and the hollow portion serves as the flow passage, and The second valve seat is formed on the inner peripheral edge of the other end of the portion, and the second valve body is housed in the flow passage of the hollow portion.
The two-way valve described. 3. The second urging means is a coil spring,
One end thereof is supported by the second valve body, and the other end thereof is supported by a spring support portion which is located inward of the first valve seat and is provided at one inlet / outlet inner peripheral portion of the valve case. The two-way valve according to claim 2, which is provided. 4. The first biasing means is a coil spring,
The one end is supported in a ring-shaped recess provided in the first valve body, and the other end is supported around the other inlet / outlet provided in the valve case.
A two-way valve according to item. 5. The valve case comprises a case body having a cylindrical shape with a bottom and a lid body that closes an open end of the case body, and the one inlet / outlet port is formed in a bottom wall of the case body. The two-way valve according to any one of claims 1 to 4, wherein the other inlet / outlet port is formed in the lid body. 6. The two-way valve according to any one of claims 1 to 5, which is a check valve for adjusting a pressure inside a fuel tank of an automobile to a predetermined pressure.