JP4781738B2 - Valve device - Google Patents

Description

The present invention relates to a valve device having a rubber seal member attached to a moving part that needs to be sealed.

  As shown in FIG. 4, for example, a water valve 6 for adjusting the amount of water is connected to the water flow pipe 5 of the water heater (FIG. 1 in Patent Document 1). The water valve 6 is driven by a driving source such as a motor to move the shaft portion forward and backward, thereby moving the valve connected to the shaft portion to adjust the opening of the water passage port of the main body. The amount of water can be adjusted appropriately.

  In order to ensure such water tightness in the water valve 6, for example, an O-ring as a sealing material is attached to a sliding portion (motion portion) between the main body and the shaft portion. The O-ring is made of a rubber having a relatively large friction coefficient and is formed in a ring shape having a circular cross section. The O-ring is mounted in a pressure contact state in a concave groove and sealed by its elasticity. Therefore, although the water tightness of the water valve 6 can be ensured by this O-ring, since it is mounted in a pressure contact state on the sliding portion, a frictional resistance is generated in the forward and backward driving of the shaft portion, and the operability of the valve is dulled. In addition, an extra load is also applied to the motor of the drive source that drives the shaft portion to advance and retract.

  Therefore, it is possible to reduce the frictional resistance at the sliding portion of the shaft portion by applying grease to the O-ring. However, the O-ring attached to a portion where water or hot water flows like the water valve 6 of the water heater. In the case of a ring, the grease is immediately washed away by water or hot water, and it is difficult to reduce the frictional resistance due to the O-ring over a long period of time.

On the other hand, in the pipe joint, as the O-ring that seals the rotating part of the receiving pipe that can be turned so that the pipe branching direction can be selected, the surface of the receiving pipe is rotated by using a fluororesin-coated surface. There is one that does not deteriorate the mobility (Patent Document 2).
JP 2004-332974 A Japanese Patent Laid-Open No. 5-149437

  Therefore, it is conceivable to use the O-ring coated with the fluororesin for the sliding portion of the water valve 6. However, unlike the receiving pipe rotating portion of the pipe joint in which the receiving pipe is hardly rotated after the pipe connection, the sliding portion in the shaft portion of the water valve 6 that is frequently driven has a fluorine resin on the surface of the O-ring. The coating is scraped off relatively early and the rubber surface is exposed. For this reason, it is difficult to reduce the frictional resistance due to the O-ring over a long period of time in the sliding portion of the water valve 6 even with such an O-ring simply coated with fluorine resin.

This invention is made | formed in view of the said situation, and makes it a subject to implement | achieve the valve apparatus provided with the sealing material which can reduce the frictional resistance with respect to the moving part which needs sealing for a comparatively long term.

The valve device according to the present invention is:
In a valve device having a moving part that needs to be sealed ,
It is configured as a water quantity servo that has a moving part that is connected to water piping such as a water heater and needs to ensure water tightness,
A main body provided with a water inlet connected to the water pipe, a valve disposed in the main body for adjusting the opening of the water inlet, a shaft portion for moving the valve forward and backward, and a shaft by advancing and retracting the valve. A rubber sealing material attached to the moving part that is in sliding contact with the base end of the part or valve,
The sealing material is a ring-shaped rubber body, a large number of fine recesses formed by blasting the surface of the rubber body, and embedded within this recess is covered formed on the rubber surface of the main body flat surface And a low friction layer made of silicon .
Thereby, when this sealing material is mounted on the moving part, the frictional resistance to the moving part can be reduced by the low friction layer initially formed on the rubber main body surface.
And even if the low friction layer on the surface of the rubber body is worn and scraped off due to frequent movement of the moving part, the low friction layer remains in many fine recesses on the surface of the rubber body. Thereby, even if the low friction layer on the surface is scraped off, the frictional resistance against the moving part can be continuously reduced by the low friction layer remaining in the recess.
Therefore, it is possible to reduce the frictional resistance against the moving part for a relatively long period of time while ensuring the sealing performance at the moving part, and to smoothly perform the operation in the moving part.

Further, in the sealing material, it is possible to easily form a large number of fine recesses in the surface of the rubber body by blanking last treatment. Further, since silicon has a smaller static friction coefficient than fluororesin, the resistance at the beginning of movement at the moving part can be further reduced by forming the low friction layer with silicon.

What slave, by attaching the sealing member to press-contact state to the motion unit, or to be cause frictional resistance advancing drive of the shaft portion blunt operation of the valve, the motor of the drive source for reciprocating the drive shaft portion There is no extra load.

In this case, the amount of water servo flow resistance is applied, while ensuring the water-tightness of the exercise unit, a relatively long period to reduce the frictional resistance to motion portion can be smoothly the operation of this exercise unit .

As described above , according to the valve device according to the present invention, when the seal member is mounted on the moving part, the friction resistance against the moving part is ensured for a relatively long period of time while securing the sealing property at the moving part. It is possible to reduce and to smoothly perform the operation in the moving part.

  Further, according to the valve device of the present invention, even if the seal member is attached to the moving part in a pressure contact state, the operability of the valve is not dulled and an extra load is not applied to the motor of the drive source. Further, since the frictional resistance on the surface of the sealing material is reduced by the low friction layer, it is possible to easily assemble the parts in the moving part such as the shaft part that contacts the sealing material.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 shows an O-ring as a sealing material in the present embodiment, and FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
As shown in FIGS. 1 and 2, the O-ring 1 includes a ring-shaped rubber body 10, a large number of minute recesses 11 formed on the surface of the rubber body 10, and the rubber body 10 including the recesses 11. It has silicon (low friction layer) 2 coated on the surface.

The O-ring 1 is attached to a moving portion such as a sliding portion such as a water valve or a rotating portion in a pressure contact state, and seals the moving portion by its elasticity. For example, it is pressed against a cylindrical member such as a shaft disposed inside the O-ring 1 to ensure watertightness, or is pressed against the inner surface of a cylindrical member disposed outside thereof to be watertight. Used to ensure sex.
The rubber body 10 is made of, for example, a synthetic rubber such as EPDM (ethylene propylene rubber), NBR (acrylonitrile butadiene rubber) or SBR (styrene butadiene rubber), natural rubber, synthetic resin, or the like.

  A large number of fine recesses 11 formed on the entire surface of the rubber body 10 are formed by blasting. For example, a ring-shaped rubber main body 10 is molded using a molding die whose inner surface is uniformly blasted by an air shot blasting device or a honing device. The recess 11 is easily formed.

  The silicon 2 is coated with a substantially constant thickness on the surface of the rubber body 10 so as to be embedded in the recess 11. Since this silicon 2 has a smaller coefficient of static friction than fluorine resin, even if this O-ring 1 is attached to a moving part such as a water valve in a pressure contact state, the resistance at the beginning of movement in the moving part can be further reduced. . Further, since the wear of the O-ring 1 is reduced by the coating of the silicon 2, the life of the O-ring 1 can be extended as compared with the case where the silicon 2 is not coated. As a coating method of the silicon 2, for example, a baking method in which a silicon virgin powder is applied to the surface of the rubber body 10 and baked in an oven is applied to the rubber body 10 in which the recesses 11 are formed by blasting or the like. It can be formed by various other methods such as a spraying method of spraying on the surface 10 or a dipping method in which the rubber body 10 is immersed in a silicon solution and silicon is adhered to the surface of the rubber body.

Next, an example in which the O-ring 1 is attached to a water amount servo as a valve device will be described.
FIG. 3 shows the internal configuration of the water amount servo.
The water amount servo 3 is connected to, for example, a water supply pipe of a water heater (see FIG. 4), and the configuration thereof is as shown in FIG. A main body 30 provided with a water port 31 (inlet 31a, outlet 31b), a valve 32 disposed in the main body 30 for adjusting the opening of the outlet 31b, and a shaft portion 33 for moving the valve 32 forward and backward. Is provided. The shaft portion 33 has a valve 32 coupled to a distal end portion thereof, and a handle 34 connected to a motor (not shown) serving as a driving source coupled to a proximal end portion thereof. The valve 32 is connected to the distal end portion of the shaft portion 33, is brought into contact with and separated from the valve seat 35 near the outflow port 31 b by the forward and backward movement of the shaft portion 33, and the opening degree with the valve seat 35 is adjusted. Thereby, the flow volume of the water and hot water which flow through the inside of water flow piping is adjusted. Further, a valve guide 36 for guiding the moving direction of the valve 30 is provided in the main body 30, and the base end portion and the shaft portion 33 of the valve 32 are slidably accommodated in the valve guide 36. .

The O-rings 1A and 1B as sealing materials are attached to the outer periphery of the valve base end portion 32a that is in sliding contact with the valve guide 36 and the inner periphery of the valve guide 36 that is in sliding contact with the shaft portion 33, respectively. Yes. These O-rings 1A and 1B are mounted in the recessed grooves 320 and 360, respectively, in a press-contact state, and the water tightness is secured by their elasticity.
An impeller 37 is disposed in the main body 30 near the inlet 31a in the water amount servo 3, and the impeller 37 is formed on the outer wall of the main body 30 near the inlet 31a by the water flow from the inlet 31a. When the is rotated, a water flow detection unit 38 for detecting the rotation is provided. That is, the impeller 37 and the water flow detection unit 38 serve as a water amount sensor.

  According to the O-rings 1A and 1B, the surface of the rubber main body 10 is coated with the silicon 2 serving as a low friction layer, so that the shaft portion 33 and the valve 32 slide between the valve guide 36 (the moving portion). The frictional resistance due to can be reduced. Even when the shaft 33 and the valve 32 are frequently operated in the water amount servo 3, even if the silicon 2 on the surface of the rubber main body 10 is worn and scraped off, the water main servo 10 has a large number of minute recesses 11 on the surface of the rubber main body 10. In this case, silicon 2 remains. Thereby, even if the silicon 2 on the surfaces of the O-rings 1A and 1B is scraped off, the sliding between the shaft portion 33 and the valve 32 and the valve guide 36 is caused by the silicon 2 remaining in the recess 11 on the surface of the rubber body 10. The frictional resistance against the part (the moving part) can be continuously reduced. Accordingly, it is possible to reduce the frictional resistance with respect to the sliding portion over a relatively long period of time while ensuring the sealing performance at the sliding portion between the shaft portion 33 and the valve 32 and the valve guide 36.

  As described above, according to the water amount servo 3, the load applied to the shaft portion 33 and the valve 32 by the O-rings 1A and 1B for ensuring water tightness is significantly reduced over a long period of time, and the operation of the shaft portion 33 and the valve 32 are reduced. Can be smoothly performed over a long period of time. Further, since the silicon 2 on the surfaces of the O-rings 1A and 1B has a smaller coefficient of static friction than that of the fluororesin, even when the O-ring 1 is attached to the sliding portion in a pressure contact state, the resistance at the start of the movement of the valve 32 is further increased. Can be reduced. In addition, because of this, an extra load on the motor of the drive source that drives the shaft portion 33 is also reduced, so that the life of the motor can be extended.

  Further, since the sliding of the shaft portion 33 and the valve 32 becomes smooth by mounting the O-rings 1A and 1B, the shaft portion 33 and the valve 32 can be smoothly moved in the assembly of the water amount servo 3. The assembly work of the water quantity servo 3 is also facilitated.

  In the above-described embodiment, the O-ring 1 having a circular cross section is shown as the sealing member. However, the seal member is not limited to this and has an X-shaped cross section, a flat cross-sectional shape, or the like. These may be formed in various cross-sectional shapes.

It is a top view which shows the O-ring as a sealing material in embodiment of this invention. It is sectional drawing which shows the cross-section of an O-ring with a partial enlarged view. It is sectional drawing which shows the structure by which O-ring was mounted | worn with the water quantity servo. It is a schematic diagram which shows the structure of the water flow piping of the water heater to which the water quantity servo is connected.

Explanation of symbols

1,1A, 1B O-ring (sealing material)
2 Silicon (low friction layer)
3 Water quantity servo (valve device)
10 Rubber body 11 Recess 30 Body 31a Inlet (water inlet)
31b Outlet (water outlet)
32 Valve 33 Shaft 36 Valve guide

Claims (1)

In a valve device having a moving part that needs to be sealed ,
It is configured as a water quantity servo that has a moving part that is connected to water piping such as a water heater and needs to ensure water tightness,
A main body provided with a water inlet connected to the water pipe, a valve disposed in the main body for adjusting the opening of the water inlet, a shaft portion for moving the valve forward and backward, and a shaft by advancing and retracting the valve. A rubber sealing material attached to the moving part that is in sliding contact with the base end of the part or valve,
The sealing material is a ring-shaped rubber body, a large number of fine recesses formed by blasting the surface of the rubber body, and embedded within this recess is covered formed on the rubber surface of the main body flat surface And a low friction layer made of silicon .

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