JP2568815Y2 - Valve body - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve element for opening and closing a valve, and more particularly to a valve element effective for a valve for raising and lowering a screw of an outboard motor.

[0002]

2. Description of the Related Art Generally, an inlet-side flow path 30
Is provided in a valve chamber 32 formed between the valve chamber 32 and the outlet side flow path 31, and is positioned so as to be able to abut / separate from a valve seat 33 formed in the valve chamber 32, and is in contact with the valve seat 33. A valve body which closes the space between the inlet side flow path 30 and the outlet side flow path 31 at the time and opens the space between the inlet side flow path 30 and the outlet side flow path 31 when separated from the valve seat 33. 21 is configured as shown in FIG.

That is, the valve element 21 has a pressure of 98 MPa.
(10 kg / cm2) to 880 MPa (90 kg / cm2)
2) used within the range of the above-mentioned valve chamber 32
A metal movable member 22 provided reciprocally within,
The movable member 22 includes a seal member 26 made of a rubber-like elastic body and mounted in a groove 23 formed on a surface of the movable member 22 facing the valve seat 33.

On the surface of the seal member 26 facing the valve seat 33, a seal portion 27 having a semicircular cross section projecting from the upper surface of the groove 23 toward the valve seat 33 is integrally formed. In addition, recesses 28 and 29 having a semicircular cross section recessed inward from the upper surface of the groove 23 are formed integrally with the inner and outer peripheral sides of the seal portion 27, respectively.

[0005] Then, the valve element 21 constructed as described above is moved in the direction of the valve seat 33, and the seal portion 27 of the seal member 26 is brought into contact with the valve seat 33.
Between the inlet side flow path 30 and the outlet side flow path 3
1 is closed, and fluid flows from the inlet side flow path 30 to the valve chamber 3.
2 is prevented from flowing out to the outlet side flow path 31.
Further, the valve body 21 is moved in a direction away from the valve seat 33 to separate the seal portion 27 of the seal member 26 from the valve seat 33, whereby the seal between the valve seat 33 and the inlet side flow passage is released. The space between the outlet 30 and the outlet-side channel 31 is opened so that the fluid is allowed to flow from the inlet-side channel 30 to the outlet-side channel 31 via the valve chamber 32.

In this case, the sealing portion 27 of the sealing member 26
Is S1, the sectional area of the concave portion 29 on the outer peripheral side of the seal member 26 is S2, and the sectional area of the concave portion 28 on the inner peripheral side of the seal member 26 is S3, the filling rate of the seal member 26 is S1.
/ (S2 + S3) × 100 (%), and since this filling rate greatly affects the durability of the sealing member 26,
Usually, the filling rate is set to 100% or less to enhance the durability of the seal member.

However, even when the filling rate is set to 100% or less, when high fluid pressure acts, the fluid pressure causes the seal portion 27 of the seal member 26 to be pressed in the direction of fluid flow and bend and deform. In such a case, not only the sealing performance is impaired, but also the bent and deformed portion interferes with the valve seat 33 side, resulting in partial cracking or breakage, resulting in poor durability. It will drop significantly.

The valve element used in the valve disclosed in Japanese Utility Model Laid-Open Publication No. 63-17373 is provided with an annular projection made of a rubber-like elastic body on a contact surface with a valve seat. By contacting the projection with the valve seat, the space between the projection and the valve seat is sealed, so that the fluid acting on the inner periphery of the projection is prevented from flowing out to the outer periphery of the projection. A stopper is provided at the outer peripheral side to limit the displacement of the projection in the valve seat direction. In such a case, the displacement of the projection in the valve seat direction can be limited, Because the displacement in the fluid flow direction cannot be limited, when high fluid pressure is applied, the protrusion bends and deforms in the fluid flow direction, resulting in impaired sealing with the valve seat. Bent or deformed parts interfere with the valve seat side, resulting in partial cracking or damage. There, the durability is significantly lowered.

Also, the valve element disclosed in Japanese Utility Model Laid-Open Publication No. 63-115564 is provided with a projection made of a rubber-like elastic body on a contact surface with the valve seat, and bringing the projection into contact with the valve seat. Although it is configured to seal between the valve seat by this, even in such a case, when high fluid pressure is applied, the projection is bent and deformed in the flow direction of the fluid, The sealing performance with the valve seat is impaired, or the bent and deformed portion interferes with the valve seat side, causing cracks and breakage, and the durability is significantly reduced.

Further, the valve element disclosed in Japanese Utility Model Laid-Open Publication No. 57-134360 also has a projection made of a rubber-like elastic body provided on a contact surface with a valve seat, and this projection is brought into contact with the valve seat. Although it is configured to seal between the valve seat and the valve seat, even in such a case, when a high fluid pressure is applied, the projection is bent and deformed in the flow direction of the fluid. In addition, the sealing performance with the valve seat is impaired, or the bent and deformed portion interferes with the valve seat side, causing cracks and breakage, and the durability is significantly reduced.

This invention solves the above-mentioned problems of the prior art. Even when high fluid pressure is applied, the sealing performance is impaired, cracks or breakage occur, and the durability decreases. It is an object of the present invention to provide a valve element which is excellent in sealing performance and durability without rubbing.

[0012]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is provided in a valve chamber formed between an inlet side flow path and an outlet side flow path and formed in a valve chamber. A seal member that is positioned so as to be able to contact and separate from the valve seat, and seals between the valve seat at the time of contact, and releases the seal between the valve seat at the time of separation; and a seal member. A valve body comprising a movable member to which a member is attached, wherein a seal portion higher than a surface of the movable member facing a valve seat is formed on the seal member, and an outer peripheral side or an inner periphery of the seal portion is formed. A concave portion lower than a surface of the movable member facing the valve seat is formed on at least one of the side portions,
Of the surface of the movable member facing the valve seat, a portion located on the inlet-side channel side with the seal portion of the seal member interposed therebetween is higher than a portion located on the outlet-side channel side, and And a means for sealing this portion with the valve seat and forming a stopper for restricting displacement of the sealing member in the direction of fluid flow.

[0013]

According to the present invention, the above-mentioned means are employed, so that at a low pressure, the seal portion of the seal member abuts against the valve seat to seal the space between the valve seat and the valve chamber from the inlet side flow path. The fluid is prevented from flowing out to the outlet side flow path via the outlet, and at the time of high pressure, the gap between the valve seat and the valve seat is sealed by the seal portion of the seal member abutting on the valve seat,
When the stopper portion of the movable member abuts on the valve seat, the gap between the valve seat and the valve seat is also sealed. Since the fluid pressure does not act, it is possible to prevent the seal portion of the seal member from being displaced in the flow direction of the fluid.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in the drawings will be described below. FIGS. 1 and 2 show a first embodiment of a valve body according to the present invention. FIG. 1 is a schematic sectional view showing the whole of the valve body, and is an explanatory view showing a state when a low pressure is applied. FIG. 2 is a schematic cross-sectional view showing the whole, and is an explanatory view showing a state at the time of high pressure operation.

That is, the valve element 1 is connected to the inlet side flow path 10.
A metal movable member 2 provided in a valve chamber 12 formed between the valve chamber 12 and the outlet side flow path 11, and positioned to be able to contact and separate from a valve seat 13 formed in the valve chamber 12; An annular sealing member 6 made of a rubber-like elastic body and attached to the movable member 2.

The valve seat 13 of the valve chamber 12 of the movable member 2
A groove 3 having a rectangular cross section is formed in an annular shape on a surface facing the above, and the seal member 6 is mounted in the groove 3. In this case, a portion 4 on the outer peripheral side of the groove 3
Is formed higher over the entire circumference than the inner peripheral portion 5, and the outer peripheral portion 4 acts as a stopper portion 4 for limiting the displacement of the seal member 6.

A sealing portion 7 having a trapezoidal cross section protruding from the upper surface of the groove 3 toward the valve seat 13 is integrally formed on the surface of the sealing member 6 facing the valve seat 13. Recesses 8, 9 each having a trapezoidal cross section that is recessed inward from the upper surface of the groove 3 are formed in the inner peripheral portion and the outer peripheral portion of the seal portion 7, respectively. In this case, the filling rate of the seal portion 7 with respect to the concave portions 8 and 9 is set to 70%, but is not limited thereto, and may be 100% or less.

Next, the operation of the above will be described. First, at the time of low pressure operation, as shown in FIG. 1, the valve element 1 located in the valve chamber 12 is moved in the direction of the valve seat 13 and is mounted in the groove 3 of the movable member 2. When the sealing surface 7a of the sealing portion 7 of the sealing member 6 is brought into contact with the valve seat 13 of the valve chamber 12, the space between the valve seat 13 and the valve seat 13 is sealed. Channel 1
1 is prevented from flowing out.

On the other hand, the valve element 1 located in the valve chamber 12 is moved away from the valve seat 13 so that the groove 3
The seal portion 7 of the seal member 6 mounted inside the valve seat 1
When separated from 3, the seal between the valve seat 13 is released, and the fluid is allowed to flow out of the inlet side flow path 10 to the outlet side flow path 11 via the valve chamber 12.

In this case, a predetermined gap is formed between the valve seat 13 and the outer peripheral portion and the inner peripheral portion of the seal portion 7 of the seal member 6, respectively. Fluid pressure acts on the outer peripheral side of the part 7 from the inlet-side flow path 10. In this case, the fluid pressure is low, and the seal part 7 of the seal member 6 has a trapezoidal cross section and Is thicker, the seal portion 7 is not displaced in the flow direction of the fluid by being pressed by the pressure of the fluid. Accordingly, the seal between the valve seat 13 and the valve seat 13 is not impaired.
No cracks or breakage occur due to interference with the side.

Next, at the time of high pressure operation, as shown in FIG. 2, the sealing surface 7a of the sealing portion 7 of the sealing member 6 of the valve body 1 located in the valve chamber 12 is moved to the valve seat of the valve chamber 12. By contacting the valve seat 13, the space between the valve seat 13 and the valve seat 13 is sealed.
In this case, since the seal portion 7 of the seal member 6 is more strongly compressed in the axial direction than at the time of the low pressure operation, the stopper portion 4 of the movable member 2 located on the outer peripheral side of the seal portion 7
And restricts the amount of displacement of the seal portion 7 in the axial direction, and also seals with the valve seat 13.

As a result, the fluid pressure does not act on the outer peripheral side of the seal portion 7 of the seal member 6, so that the seal portion 7 of the seal member 6 is displaced in the flow direction of the fluid by receiving the high fluid pressure and the valve. The seal between the seat 13 and the seal member 6 is impaired, or the portion of the seal member 6 displaced in the fluid flow direction is the valve seat 13.
It will not interfere with the side and cause cracks or breakage.

Therefore, the seal portion 7 of the seal member 6 is not displaced excessively in the axial direction or the radial direction (the length direction of the fluid) under both the low pressure operation and the high pressure operation. The property is remarkably improved.

FIG. 3 shows a second embodiment of the valve body according to the present invention. The valve body 1 shown in this embodiment has a cross section at an inner peripheral side of a seal portion 7 of a seal member 6. Has a trapezoidal concave portion 8 and a portion on the outer peripheral side of the seal portion 7 is formed at the same height as the stopper portion 4 located on the outer peripheral side of the groove 3. Since it has the same configuration as that shown in the first embodiment, the same parts as those shown in the first embodiment are denoted by the same reference numerals, and detailed description of the configuration is omitted. Shall be.

In the valve element 1 shown in this embodiment, similarly to the valve element shown in the first embodiment, the valve element 1 located in the valve chamber 12 at the time of the low pressure operation is used. Valve seat 1
3 to make the seal surface 7a of the seal portion 7 of the seal member 6 mounted in the groove 3 of the movable member 2 abut against the valve seat 13 so that the space between the valve seat 13 and the valve seat 13 is sealed. Thus, the fluid is prevented from flowing out of the inlet side flow path 10 to the outlet side flow path 11 via the valve chamber 12.

On the other hand, the valve element 1 located in the valve chamber 12 is moved away from the valve seat 13 so that the groove 3
The seal portion 7 of the seal member 6 mounted inside the valve seat 1
3, the seal between the valve seat 13 and the valve seat 13 is released, and the fluid is allowed to flow out of the inlet-side channel 10 to the outlet-side channel 11 via the valve chamber 12.

In this case, a predetermined gap is formed between the outer peripheral side and the inner peripheral side of the seal portion 7 of the seal member 6, respectively, with the valve seat 13. Fluid pressure acts on the outer peripheral side of the part 7 from the inlet-side flow path 10. In this case, the fluid pressure is low, and the seal part 7 of the seal member 6 has a trapezoidal cross section and Is formed thicker, so that the seal portion 7 is not displaced in the flow direction of the fluid by being pressed by the fluid pressure. Therefore, the seal between the valve seat 13 and the seal portion 7 is not impaired, and the seal portion 7 does not interfere with the valve seat 13 side to cause cracks or breakage.

Next, at the time of high pressure operation, the sealing surface 7a of the sealing portion 7 of the sealing member 6 of the valve body 1 located in the valve chamber 12 comes into contact with the valve seat 13 of the valve chamber 12 so that the valve is opened. The space between the seat 13 is sealed. In this case, since the seal portion 7 of the seal member 6 is more greatly compressed in the axial direction than at the time of the low pressure operation, the stopper portion 4 of the movable member 2 located on the outer peripheral side of the seal portion 7 comes into contact with the valve seat 13. , Seal part 7
In the axial direction, and also seals with the valve seat 13.

As a result, the fluid pressure does not act on the outer peripheral side of the seal portion 7 of the seal member 6, and the seal member 6
The seal portion 7 is displaced in the fluid flow direction due to the high fluid pressure and the sealing property with the valve seat 13 is impaired, or the portion of the seal member 6 displaced in the fluid flow direction is the valve seat 13 side. And no cracks or breakage are caused.

Therefore, the seal portion 7 of the seal member 6 does not undergo excessive displacement in the axial direction or the radial direction (flow direction of the fluid) at the time of the low pressure operation and the high pressure operation. It will be significantly improved.

In this embodiment, a concave portion 8 is formed on the inner peripheral side of the seal portion 7 of the seal member 6, and the outer peripheral portion has the same height as the stopper portion 4 on the outer peripheral side of the groove 3. However, a concave portion may be formed in a portion on the outer peripheral side of the seal portion 7 of the seal member 6, and the inner peripheral portion may be formed at the same height as the inner peripheral portion 5 of the groove 3. It is.

In each of the above embodiments, the sealing portion 7 of the sealing member 6 has a trapezoidal cross section. However, the present invention is not limited to this. Good thing.

Further, in each of the above embodiments, the fluid pressure acts on the outer peripheral side of the seal portion 7 of the seal member 6, but the fluid may act on the inner peripheral side of the seal portion 7. In this case, the portion 5 on the inner peripheral side of the groove 3 of the movable member 2 is formed higher than the portion 4 on the outer peripheral side so as to function as a stopper for limiting the displacement of the seal member 6. Good thing.

[0034]

The present invention is constructed as described above, and at the time of low pressure operation, the seal portion of the seal member abuts against the valve seat of the valve chamber to seal the gap between the valve seat and the inlet side. Prevents fluid from flowing out of the flow path to the outlet side flow path through the valve chamber, and at the time of high pressure operation, the seal portion of the seal member contacts the valve seat to seal between the valve seat and the valve seat. At the same time, the stopper portion of the movable member abuts on the valve seat to seal the gap between the valve seat and the movable member. In this case, the stopper portion of the movable member is located closer to the inlet side flow path than the seal portion of the seal member. Therefore, the high-pressure fluid from the inlet-side flow path can be prevented from directly acting on the outer peripheral side of the seal portion of the seal member. Therefore, the high-pressure fluid acts on the seal portion of the seal member, and the seal portion is displaced in the flow direction of the fluid, thereby impairing the sealing property between the valve seat and the portion displaced in the flow direction of the fluid. It will not interfere with the side and cause cracks or breakage. Therefore, it has an excellent effect that a reliable sealing property can be obtained both at the time of the low pressure action and the high pressure action, and the durability can be remarkably improved.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing a first embodiment of a valve body according to the present invention, and is an explanatory view showing a state when a low pressure is applied.

FIG. 2 is an explanatory diagram showing a state of the one shown in FIG. 1 when a high pressure is applied.

FIG. 3 is a schematic sectional view showing a second embodiment of the valve body according to the present invention.

FIG. 4 is a schematic sectional view showing an example of a conventional valve body.

[Explanation of symbols]

 1, 21: valve element 2, 22: movable member 3, 23: groove 4: part on the outer peripheral side (stopper part) 5: part on the inner peripheral side 6, 26: sealing member 7, 27 ... ... Seal part 7a ... Seal surface 8, 9, 28, 29 ... Depression 10, 30 ... Inlet side flow path 11, 31 ... Outlet side flow path 12, 32 ... Valve chamber 13, 33 ... Valve seat

Claims (1)

(57) [Scope of request for utility model registration] An inlet channel (10) and an outlet channel (1).
1) is provided in a valve chamber (12) formed between the valve chamber (1) and a valve seat (13) formed in the valve chamber (12). A seal member (6) adapted to seal between the seat (13) and release the seal from the valve seat (13) when separated, and a movable member to which the seal member (6) is attached (2), wherein the seal member (6) is provided with a seal portion (7) higher than a surface of the movable member (2) facing the valve seat (13), and Concave portions (8) and (9) lower than the surface of the movable member (2) facing the valve seat (13) are formed on at least one of the outer peripheral side and the inner peripheral side of the seal portion (7). And the movable member (2)
Of the surface facing the valve seat (13), a portion located on the inlet side flow path (10) side with the seal portion (7) of the seal member (6) interposed therebetween is positioned on the outlet side flow path (11) side. , And lower than the seal portion (7), seals this portion with the valve seat (13), and the flow direction of the fluid in the seal member (6). A stopper body (4) for limiting displacement of the valve body.