KR20030068382A - Two-way valve - Google Patents

Abstract

(Problem) It is an object of the present invention to provide a two-way valve that can reduce the number of parts, simplify the assembly process, reduce the manufacturing cost, and can supply at low cost.

(Solution means) The tank paper in which the second valve body 4 for opening and closing the flow passage 25 formed in the first valve body 2 is disposed between the second valve body and the inner surface of the valve case 1. It was comprised so that it might be carried by the means 5.

Description

2-way valve {TWO-WAY VALVE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-way valve having two entrances and configured to open a valve irrespective of the normal / negative pressure and negative pressure when the pressure difference between these entrances reaches a predetermined pressure. It is installed between the fuel tank and the canister, and is very suitable for use as a check valve to maintain the inside of the fuel tank at a predetermined pressure by opening the valve when the fuel tank is higher than the predetermined pressure range and lower than the predetermined pressure range. A two-way valve.

A two-way valve, usually called a check valve, is provided between the fuel tank of the automobile and the canister. When the tank is in a constant pressure state of a predetermined value or more, the check valve opens to open the pressure in the tank to the canister. Even when the tank is in a pressure-reduced state below a predetermined value, the check valve opens to release the pressure-reduced state in the tank.

Conventionally, as said check valve, the two-way valve disclosed by Unexamined-Japanese-Patent No. 9-60744 is known.

As shown in Fig. 5 and Fig. 6, the two-way valve is a cover in which the case body a connected to the two-pipe a1 connected to the fuel tank and the pipe bl connected to the canister are integrally connected. A valve case (c) consisting of a sieve (b), a cylindrical valve body (d) having a bottom, and a valve seat cap (e) attached and fixed to the valve body (d), wherein the valve case (c) A first valve body f disposed therein, a coil spring g holding the first valve body f, a second valve body h accommodated in the first valve body f, It consists of the coil spring i which hold | maintains this 2nd valve body h.

A ring-shaped first valve seat a3 protruding into the case is formed at the first inlet a2 formed in the case body a of the valve case c, and a second inlet formed in the lid b. A ring-dol jab b3 on which one end of the coil spring g is supported is formed around the b2.

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 port d2 is formed in the valve head d1. It is. In addition, in the valve seat cap e constituting the first valve body f, a flow port e2 is formed in a wall portion that closes the open end of the valve body d, and an inner circumference of the flow port e2 is formed. The second valve seat e3 is formed. The first valve opening f is supported by the coil spring g having one end supported by the ring protrusion b3 and the other end abutted against the valve seat cap e. It is tethered to a2) side.

The second valve body h has a cylindrical shape in which the tip portion is closed in a substantially dome shape, and the tip portion formed in the dome shape is the valve head h1. The second valve body h is arranged to be movable in the first valve body f, and the second valve seat e3 is provided by a coil spring i disposed in the first valve body f. It is hard to be pointed toward.

In this two-way valve, as shown in FIG. 6, the valve head h1 of the second valve body h abuts on the second valve seat e3, so that The valve head d1 of the first valve body f abuts on the first valve seat a3 in a state where the internal cavity is closed, and the first entrance a2 is closed in a closed state.

In this state, when the pressure in the fuel tank rises and the first entrance a2 side becomes higher than the second entrance b2 side by a predetermined pressure or more, as shown in FIG. 7, from the first entrance a2 side By the pressure, the first valve body f moves against the holding force of the coil spring g, so that the valve head d1 of the first valve body f is separated from the first valve seat a3. The first inlet a2 is opened, and the pressure at the fuel tank side passes from the first inlet a2 to the outer circumferential surface of the first valve body f and the inner circumferential surface of the valve case c. It passes through (b2) and opens to a canister side.

Conversely, if the fuel tank is depressurized and the second entrance b2 side becomes higher than the predetermined pressure higher than the first entrance a2 side, as shown in FIG. 8, by the pressure from the second entrance b2 side. The second valve body h moves in response to the holding force of the coil spring i, the valve head h1 of the second valve body f is separated from the second valve seat e3, and the outlet port e2. ), The pressure on the canister side passes through the distribution port e2 at the second entrance port b2 and passes between the outer circumferential surface of the second valve body h and the inner circumferential surface of the first valve body f. (d2) and the first entrance (a2) are sequentially passed through the fuel tank, the pressure-reduced state in the fuel tank is eliminated.

As described above, according to the two-way valve, when the fuel tank is pressurized or decompressed beyond the predetermined pressure range, the valve can be opened to open the positive pressure or the negative pressure in the tank to the canister side so that the fuel tank can always be maintained in the predetermined pressure range. It is.

However, the two-way valve has a large number of parts and a complicated assembly process, causing them to increase the manufacturing cost. That is, as shown in FIG. 5, this two-way valve is a case body (a), a cover body (b), a valve body (d), a valve seat cap (e), a coil spring (g), and a 2nd valve body. (h) and eight parts of the coil spring i are required, and the assembly firstly arranges the second valve body h and the coil spring i in the valve body d, and this valve body a first assembling step of assembling and fixing the valve seat cap (e) to (d) to assemble the first valve body (f) in which the second valve body (h) is inserted, and the first valve body (f) and the coil The spring g is arrange | positioned in the case main body a, and the 2nd assembly process of the 2nd assembly process of adhesively fixing the cover body b to this case main body a is required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a two-way valve which can reduce the number of parts, simplify the assembly process, reduce the manufacturing cost, and can be supplied at low cost. It is done.

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

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

Figure 3 is a cross-sectional view showing a state in which the two-way valve is opened by the entrance and exit side of one side is pressed.

Figure 4 is a cross-sectional view showing a state in which the two-way valve is opened by the other side entrance and exit side is pressed.

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

6 is a cross-sectional view showing a state in which the two-way valve is closed;

7 is a cross-sectional view showing a state in which the two-way valve is opened by the entrance and exit side of one side is pressed.

Fig. 8 is a cross-sectional view showing a state in which the two-way valve is opened when the other entrance and exit side is pressed.

* Description of the symbols for the main parts of the drawings *

1-valve case 11-case body

111-1st entrance 112-1st valve seat

113-step part (spring support part) 12-cover

121-2nd entrance 2-1st valve body

21-Distribution Channel 22-Valve Head

23-2nd valve seat 24-Ring-shaped recess

3-coil spring (first gripping means) 4-second valve body

41-VALVE HEAD 5-COIL SPRING

In order to achieve the above object, the present invention has a valve case having two entrances provided to face each other and having a first valve seat formed at an entrance of one side, and movably disposed in the valve case and formed at the entrance of the one side. A first valve body in contact with a first valve seat to close the entrance and exit, and disposed between the first valve body and an inner surface of the valve casing and holding the first valve body toward the entrance of the one side; A first holding means, a flow passage formed in the first valve body and having a second valve seat formed at one end thereof, a second valve body which abuts the flow passage by abutting the second valve seat of the flow passage; And a second gripping means disposed between the second valve body and the inner surface of the valve case and holding the second valve body toward the second valve seat of the flow passage. It becomes,

When the pressure at the inlet side on the one side becomes a predetermined pressure higher than the pressure at the inlet side on the other side, the first valve body moves in response to the holding force of the first fingering means, opens the inlet on one side, and moves to the inlet side on the other side. When the pressure on the other entrance side is increased by a predetermined pressure than the pressure on the one side entrance side, the second valve body moves against the holding force of the second holding means to open the flow passage. It provides a two-way valve, characterized in that configured to send the pressure through the flow passage to the inlet side of one side.

That is, the two-way valve of the present invention is configured such that the second valve body for opening and closing the flow path formed in the first valve body is supported by the holding means disposed between the second valve body and the inner surface of the valve case. Therefore, it is not necessary to form the spring rest in the first valve body as in the case of placing the holding means such as a coil spring in the first valve body to hold the second valve body. For this reason, after arranging a 2nd valve body and a coil spring in the valve body which comprises a 1st valve body like the above-mentioned conventional example, it is not necessary to adhere | attach and fix a valve seat cap, and to block a valve body, In this invention, The part corresponding to the valve seat cap e in the said conventional example can be abbreviate | omitted.

Further, the assembling work is completed by a one-step assembling step of disposing the first valve body, the second valve body and the two holding means in the valve case, and closing the valve case. The assembly process can be simplified compared to the case where the assembly process of the step is required.

As described above, according to the two-way valve of the present invention, since the number of parts can be reduced and the assembly process can be simplified, the manufacturing cost can be reduced and the supply can be made at a lower cost.

Embodiment of the Invention

Hereinafter, the present invention will be described in more detail with reference to examples of the present invention.

1 to 2 show a two-way valve according to an embodiment of the present invention. The two-way valve includes a case main body 11 and a canister in which a pipe 11a connected to a fuel tank of an automobile is integrally connected. The valve case 1 which consists of the cover body 12 which the pipe 12a connected to the body connected integrally, the 1st valve body 2 of substantially cylindrical shape, and the coil spring which hold | maintains this 1st valve body 2 is carried out. (3) (1st finger holding means), the 2nd valve body 4 accommodated in the 1st valve body 2, and the coil spring 5 (2nd finger holding means) which hold | maintains this 2nd valve body 4 )

In the case main body 11 which comprises the said valve case 1, the 1st entrance 111 is formed in the connection part of the pipe 11a, and the 1st valve in which the inner peripheral surface of this 1st entrance 111 was tapered was formed. A seat 112 is formed, and a stepped portion 113 (spring support) on which an end of the coil spring 5 is supported is formed at the boundary between the first valve seat 112 and the pipe 11a. In addition, a plurality of protrusions 114 along the axial direction are formed on the inner circumferential surface of the case main body 11 evenly. The pipe 11a is connected to two branch pipes 11b connected to the fuel shutoff valve provided in the fuel tank.

In addition, in the cover body 12 constituting the valve case 1, a second inlet 121 is formed at the connection portion of the pipe 12a, and the cover body 12 opens the case body 11. Adhesively fixed to the end by ultrasonic welding, the valve case 1 is constituted by the lid 12 and the case main body 11.

The said 1st valve body 2 is a substantially cylindrical valve body, The hollow part becomes the flow path 21 which opened both ends. Further, at one end thereof, a ring protrusion is formed in which the circumferential wall of the hollow portion extends outward, and the outer circumferential surface of the ring protrusion is formed in a tapered shape, and the ring protrusion is formed as the valve head 22. In addition, the other end inner peripheral part formed in the small diameter of the other end of a hollow part becomes the 2nd valve seat 23. As shown in FIG. And around the said hollow part, the ring-shaped recessed part 24 opened in the other end surface peripheral part of the 1st valve body 2 is formed, and the said coil-shaped recessed part 24 is formed in the said coil 24. One end of the spring 3 is supported. Further, a plurality of protrusions 25 along the axial direction are formed to project evenly on the inner circumferential surface of the hollow portion of the first valve body 2.

As shown in FIG. 2, the first valve body 2 is disposed in the valve case 1 with the valve head 22 toward the first entrance 111 side, and one end of the ring-shaped recess is formed. The coil spring 3, which is supported in the portion 24 and the other end is arranged in contact with the circumference of the first entrance 121 of the lid 12, is supported on the first entrance 111 side. Moreover, since the ring-shaped recess 24 of the 1st valve body 2 is deeply recessed until reaching the wall part of the other end from the end surface of the 1st valve body 2, the coil spring 3 The one end of the () is stably supported in the ring-shaped recess 24 so that the first valve body 2 does not tilt or fall down due to the fingering of the coil spring 3.

Subsequently, the second valve body 4 has a cylindrical shape in which the tip portion is closed in a substantially dome shape, and the tip portion formed in the dome shape is the valve head 41. Moreover, four protrusion pieces 42 which continue in the outer peripheral surface of the 2nd valve body 4 are protruded evenly from the peripheral part of the open end side of the 2 valve body 4 now.

And as shown in FIG. 2, the said 2nd valve body 4 is so that the valve head 41 may face the 2nd valve seat 23 in the flow path 21 of the said 1st valve body 2. As shown in FIG. The stepped portion is disposed so as to be movable, one end of which is supported inside each of the protrusion pieces 42 of the second valve body 4 and the other end of which is formed on the inner circumference of the inlet and outlet 111 on one side of the valve case 1. The coil spring 5 supported by 113 (spring support part) is supported toward the 2nd valve seat 23.

In the present embodiment, the case body 11 and the lid body 12, the first valve body 2 and the second valve body 4 constituting the valve case 1 are excellent in fuel impermeability. It is formed of polyacetal resin. In this case, these forming materials are not limited to polyacetal resin, but can be formed of various resin materials, but it is preferable to use a material having excellent fuel impermeability.

Subsequently, 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 abuts on the second valve seat 23 so that the first valve body 2 flows. In the state in which the furnace 21 (inner cavity) is closed, the valve head 22 of the first valve body 2 abuts on the first valve seat 112 of the valve case 1 so as to contact the first doorway ( 111 is closed in a closed state.

In this state, when the pressure in the fuel tank rises and the first entrance 111 side becomes higher than the second entrance 121 side by a predetermined pressure or more, as shown in FIG. 3, from the first entrance 111 side. The first valve body 2 moves against the holding force of the coil spring 3 by the pressure, so that the valve head 22 of the first valve body 2 is separated from the first valve seat 112, and the first valve seat 2 is moved. 1 The doorway 111 is opened. The air flow due to the pressure on the fuel tank side passes between the outer circumferential surface of the first valve body 2 and the inner circumferential surface of the valve case 1 from the first inlet 111, and passes through the second inlet 121. Flow to the canister side opens pressure in the fuel tank.

On the contrary, when the pressure inside the fuel tank is depressurized and the second entrance 121 side becomes higher than the predetermined pressure higher than the first entrance 111 side, as shown in FIG. 4, the pressure from the second entrance 121 side. As a result, the second valve body 4 moves in response to the holding force of the coil spring 5, so that the valve head 41 of the second valve body 4 is separated from the second valve seat 23 so as to be spaced apart from the second valve seat 23. The flow passage 21 (hollow part) of the valve body 2 opens. And the airflow by the pressure of a canister side flows into the flow path 21 from the 2nd entrance and exit 121, and passes between the outer peripheral surface of the 2nd valve body 4, and the inner peripheral surface of the 1st valve body 2, The pressure in the fuel tank is released by passing through the first entrance 111 to the fuel tank.

As described above, according to the two-way valve, when the fuel tank is pressurized or decompressed beyond a predetermined pressure range as in the conventional two-way valve shown in FIGS. 5 to 8, the canister is opened to open or close the positive or negative pressure in the tank. By opening to the side, the fuel tank can be maintained at a predetermined pressure range at all times.

In this case, in the two-way valve of the present embodiment, the second valve body 4 that opens and closes the flow passage 21 formed in the first valve body 2 includes the second valve body 4 and the valve case 1. Since it is comprised so that it may be touched by the coil spring 5 arrange | positioned between the stepped part 113 formed in (), the holding means, such as a coil spring, may be arrange | positioned in the 1st valve body 2, and 2nd valve body 4 may be carried out. Note that it is not necessary to form the spring bearing in the first valve body as in the case of touching the c). For this reason, after arrange | positioning the 2nd valve body h and the coil spring i to the valve main body d which comprises the 1st valve body f like the conventional valve shown in FIGS. Since it is not necessary to close the valve body d by adhesively fixing the seat cap e, the parts corresponding to the valve seat cap e in the above example are omitted in the two-way valve of the present embodiment.

In addition, the assembly operation arrange | positions the 1st valve body 2, the 2nd valve body 4, and the two coil springs 3 and 5 in the case main body 11 which comprises the valve case 1, and this case Since the cover body 12 is fixed to the main body 11 by ultrasonic welding and completed by a one-step assembling process only by closing the case main body 11, the conventional valve shown in FIGS. Likewise, the assembly process can be simplified as compared with the case where a two-step assembly process is required.

Thus, according to the two-way valve of the present embodiment, the number of parts can be reduced and the assembly process can be simplified, so that the two-way valve can be supplied at a lower cost by reducing the manufacturing cost.

In addition, the two-way valve of the present invention is not limited to the above-described embodiment, and the angles of the valve case 1, the first valve body 2, the second valve body 4, and the holding means 3, 5, etc. The shape and the like of the parts can be appropriately changed, and other configurations are also prevented without departing from the gist of the present invention. Moreover, although the two-way valve of this invention is used suitably as a check valve arrange | positioned between a fuel tank of a motor vehicle and a canister, the use is not limited to this, It is not limited to this, It is various spaces in a container or other closed-shaped space part. The valve can be opened and closed in accordance with a pressurized state or a depressurized state, and can be suitably used as a valve for maintaining pressure in various vessels or other closed spaces in a certain range.

As described above, according to the two-way valve of the present invention, the number of parts can be reduced and the assembly process can be simplified, so that the manufacturing cost can be reduced and the two-way valve can be provided at a lower cost.

Claims (6)

A valve case having two entrances formed to face each other and having a first valve seat formed at one entrance; A first valve body which is disposed in the valve case and is in contact with a first valve seat formed at an entrance of the one side and closes the entrance; First gripping means disposed between the first valve body and an inner surface of the valve case, the first gripping means for holding the first valve body toward an entrance of the one side; A flow passage formed in the first valve body and having a second valve seat at one end thereof; A second valve body which abuts the second valve seat of the flow passage and closes the flow passage; It is provided between the said 2nd valve body and the inner surface of the said valve case, Comprising: 2nd holding means which hold | grip the said 2nd valve body toward the 2nd valve seat of the said flow path, Comprising: When the pressure at the inlet side of the one side is higher than the pressure at the inlet side of the other side, the first valve body moves to resist the holding force of the first fingering means, opens the inlet at one side, and moves to the inlet side at the other side. When the pressure is sent and the pressure at the other side of the entrance is higher than the pressure at the side of the one side, the second valve body moves in response to the holding force of the second holding means to open the flow passage. Two-way valve, characterized in that configured to send the pressure through the flow path to the entrance side of one side. The method according to claim 1, The first valve body is provided with a valve head in contact with the first valve seat at one end of the substantially cylindrical main body, and the hollow portion serves as the flow passage, and the second end portion is formed in the inner peripheral edge of the other end of the hollow portion. A valve seat is formed, wherein the second valve body is accommodated in the flow path of the hollow part. The method according to claim 2, The second gripping means is a coil spring, one end of which is supported by the second valve body, and the other end of which is provided inside the first valve seat and is formed on the inner circumference of the inlet and outlet of one side of the valve case. 2-way valve supported on spring support. The method according to any one of claims 1 to 3, And the first gripping means is a coil spring, one end of which is supported in a ring-shaped recess formed in the first valve body, and the other end of which is supported around the entrance and exit of the other side formed in the valve case. The method according to any one of claims 1 to 4, The valve case includes a tubular case body having a bottom and a lid for closing an open end of the case body, and an entrance of the one side is formed on the bottom wall of the case body, and the lid The two-way valve is formed in the sieve the other entrance. The method according to any one of claims 1 to 5, 2-way valve that is a check valve for adjusting the inside of a fuel tank of a vehicle to a predetermined pressure.