JPH01176866A - Changeover valve - Google Patents

Abstract

PURPOSE:To rotate a valve body smoothly by applying fluororesin coating onto the surface of a packing contacting with the valve body and sealing the circumference of a flow-out hole, thereby reducing frictional resistance between the valve body and a seal ring. CONSTITUTION:A changeover valve 5 is formed of synthetic resin into a cylinder and a mixed water flow-out hole 5a is made through the circumferential wall thereof. First and second flow-out chambers 6a, 7a communicated respectively with first and second flow-out sections 6, 7 are arranged at the opposite sides of the changeover valve 5. Sealing mechanisms provided with sleeves 10 and packings 10b are arranged respectively for the first and second flow-out chambers 6a, 7a. Fluororesin coating 10f is applied onto the sliding face of the packing 10b in order to improve slipperiness with respect to the circumferential face of the changeover valve 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a switching valve provided in a water faucet, a hot/cold water mixing faucet, a water heater, etc.

[Conventional technology]

BACKGROUND ART In various piping systems, it is common practice to provide a switching valve to change the destination of water or hot water. This switching valve has a structure in which a plurality of outflow sections are provided for one inflow section, and a flow path to an arbitrary outflow section is opened by actuation of a built-in valve body.

FIG. 5 shows a conventionally commonly used switching valve. A cylindrical valve body 51 is rotatably provided inside a casing 50 of the switching valve, and an opening located at the upper end or lower end of this valve body 51 is used as an inflow port for water or hot water, and a hole 5 provided in the peripheral wall is used.
2 is the outflow part. And in the casing 50,
Flow paths 53 and 54 having different supply destinations are formed, and the valve body 51 is rotated so that the outflow hole 52 is aligned with one of these flow paths 53 and 54. By this operation, the flow path 5
3 or 54 is aligned with the outflow hole 52 to send water or hot water to the required supply destination.

A seal ring 55,56 for sealing the circumferential surface of the valve body 51 is attached to the artificial part of the flow path 53,54.

These seal rings 55, 56 are made of an elastic body such as rubber and are formed as annular bodies coaxial with the flow passages 53, 54. The surface facing the valve body 51 is
The valve body 51 is formed into a curved shape according to the curvature of the outer peripheral surface of the valve body 51.
It functions as a seal against water or hot water from inside.

In this switching valve, since the valve body 51 is cylindrical,
A seal ring 55 is provided on the circumferential surface of the valve body 51 around the outflow hole 52.
56, it is necessary to use a special shaped sealing member different from flat packing, O'Jing, etc.

Further, the outflow hole 52 of the valve body 51 is bored by a drilling machine or the like. At this time, a machining method in which the drilling direction is perpendicular to the axis of the valve body 51 is commonly performed, and by this machining, the opening edge of the outflow hole 52 has a cross-sectional shape with an acute angle on the outer surface side as shown in the figure. Due to this sharp opening edge,
When the valve body 51 rotates, the surfaces of the seal rings 55, 56 are often scratched. As a result, seal ring 5
Peeling or chipping occurs at 5°56, degrading the sealing properties.

Therefore, the present inventors created a seal ring 5 by chamfering the outer opening edge of the outflow hole 52 into a gently curved shape.
5.56 was developed and the application was made in 1982-
The application was filed as No. 131008.

[Problem that the invention seeks to solve]

By the way, as described above, the outflow hole 52 provided in the valve body 51 is curved with a constant curvature in the circumferential direction of the valve body 51, and is linear in the axial direction. In order to seal the valve body 51 having such a curved surface shape, it is necessary to increase the sealing pressure of the packing against the valve body 51 considerably. Since the valve body 51 rotates against this sealing pressure, if an elastic body such as ordinary rubber is used as the seal ring 55, 56, the rotational driving force of the valve body 51 by the electric motor will be affected to some extent. You must choose one with a large capacity in order to have some leeway.

Furthermore, the smooth rotation of the valve body 51 may be inhibited due to an increase in seal pressure due to the special shape of the seal rings 55, 56. In particular, when attempting to finely adjust the flow rate, it is necessary to rotate the valve body 51 by a small angle in a short period of time, but this rotational operation cannot be performed smoothly due to the aforementioned increase in seal pressure.

Therefore, the purpose of the present invention is to reduce the frictional resistance between the valve body and the seal ring by coating the surface of the packing that comes into contact with the valve body with a fluororesin, thereby allowing the valve body to rotate smoothly. shall be.

[Means for solving problems]

In order to achieve the object, the switching valve of the present invention rotatably accommodates a hollow cylindrical valve body in a valve chamber provided with a plurality of outflow portions, and has an outflow hole connected to any of the outflow portions. The valve body is characterized in that the sealing surface of a gasket, which is provided in the peripheral wall of the valve body and seals around the outflow hole, is coated with a fluororesin.

〔Example〕

Hereinafter, the features of the present invention will be specifically explained using examples with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a hot water mixing faucet incorporating the switching valve of the present invention, and FIG. 2 is a sectional view taken along the line I--I in FIG. 1.

The main body 1 of the hot water mixing faucet is housed inside a box A,
Install it in a convenient location for hot water supply, such as a bathroom or kitchen. Short pipes are raised on the left and right sides of the upper end of the main body 1, and the inside thereof is used as a water flow manhole 2 and a hot water inflow part 3, respectively.The water flow manhole 2 is connected to a water supply pipe 2a, and the hot water inflow part 3 is connected to a water heater, etc. A hot water supply pipe 3a is connected to each of the hot water supply pipes 3a. In addition, the water supply pipe 2a
And the hot water supply pipe 3a is provided with a knob 2b for stopping the water at - time, respectively.
, 3b are provided. Further, a mixing valve 4 and a switching valve 5 are arranged coaxially at the upper and lower ends of the main body l, respectively, and the switching valve 5 switches the flow path to the first outflow part 6 and the second outflow part 7 at the lower end. .

The mixing valve 4 is made of synthetic resin and has a cylindrical shape with an open bottom end.As shown in FIG. Spindle 4C is sticking out. Further, at the lower end of the mixing valve 4, a rectifying fluid 4d is provided for rectifying the mixed water of water and hot water passing through the inside. Furthermore, a water inflow chamber 8 and a hot water inflow chamber 9 are formed on the left and right sides of the main body 1 so as to correspond to the water flow manhole 4a and the hot water inflow hole 4b, which communicate with the flow paths from the water flow manhole 2 and the hot water inflow part 3. Ru. Note that the opening centers of the water flow manhole 4a and the hot water inflow hole 4b are set at positions that are at a predetermined angle with respect to the axis of the mixing valve 4. Therefore, when the mixing valve 4 is rotated, the water flow manhole 4a and the hot water inflow hole 4b are
The water flow manhole 2 and the hot water inlet 3 are opened at different valve opening degrees.
It is possible to mix hot water and water.

The water inflow chamber 8 has a sleeve 10 with a hole 10a.
is disposed in a position perpendicular to the axis of the mixing valve 4, and a gasket 10b for sealing around the water flow manhole 4a of the mixing valve 4 is attached to its tip.

Furthermore, in order to seal the circumferential surface of the cylindrical mixing valve 40, the sealing surface of the packing 10b is curved and requires directionality. do. That is, the sleeve 10 is inserted from the outside of the main body l and is integrally fixed by a pusher xlQc screwed into the main body l. Therefore, if the posture of the seal 10b is set correctly to fit the circumferential surface of the mixing valve 4, the rotation when screwing in the pusher Lloc will not be transmitted to the seal 10b, causing twisting of the seal 10b. It can be installed without any trouble. On the other hand, the hot water inflow chamber 9 also has a mechanism for sealing around the hot water inflow hole 4b of the mixing valve 4.
A sleeve and packing similar to those on the a side are arranged.

The switching valve 5 is made of synthetic resin and has a cylindrical shape with an open upper end, and has a mixed water outlet hole 5a in its peripheral wall and a spindle 5b in its lower end. A first outflow chamber 6a and a second outflow chamber 7a communicate with the left and right first outflow portions 6 and second outflow portions 7, respectively.
are provided so as to sandwich the switching valve 5. These first. The second outflow chambers 6a, 7a include the aforementioned sleeves 10.
A sealing mechanism including a gasket 10b and the like is arranged.

FIG. 3 is an enlarged longitudinal section showing the second outflow chamber 7a side. The sleeve 10 in the sealing structure for the switching valve 5 has a circumferential protrusion 10d formed on its circumferential surface. That is, the sleeve 10 has protrusions IQd formed at two locations in the radial direction, and the main body 1 is provided with a groove 1a into which the protrusions 10d fit. And these protrusions 10d
After inserting the sleeve 10 into the main body 1, the sleeve 10 can be held so as not to rotate by the groove 1a.

Therefore, after the sleeve 10 is inserted and set, the sleeve 10 does not rotate even when the pusher Lloc is screwed in, and the gasket 10b does not twist at all.

FIG. 4 is an exploded view of the sleeve 10 and the packing 10b. The packing fob is curved in one direction in order to seal the circumferential surface of the cylindrical switching valve 5 described above. Further, in order to reinforce this curved surface, a ring 10e is inserted between the sleeve 10 and the packing 10b. In order to improve sliding on the circumferential surface of the switching valve 5, the sliding surface of the packing 10b is coated with a fluororesin 10f.

This fluororesin 10f can be integrally molded in a layered manner on the sliding surface of the packing 10b when it is vulcanized. The switching valve 5 and the packing tab are made of fluorine resin 10f.
The frictional resistance between the switching valve 5 and the switching valve 5 is reduced, and the rotational operation of the switching valve 5 is performed smoothly. Therefore, the responsiveness of the switching valve 5, which uses the electric motor 12 as a driving source, is improved, and fine adjustment of the flow rate, etc., can be performed quickly and appropriately.

The above mixing valve 4 and switching valve 5 are arranged coaxially. By rotating the mixing valve 4 and the switching valve 5, the mixing and flow rate of hot water and water, as well as the first. Second class.

The flow paths to the mountain portions 6 and 7 are switched. and an electric motor 11.1 for rotationally driving the mixing valve 4 and the switching valve 5.
2 are arranged respectively, and the rotation of the output shaft is controlled by the reducer 11a.
, 12a to the spindles 4c, 5b.

Further, a communication passage 13 is formed between the mixing valve 4 and the switching valve 5 so as to have a passage axis that coincides with the axis of these valve bodies. An impeller-type flow rate detection device 14 that rotates due to the flow of water is provided on the upper side of the communication channel 13.
A temperature sensor 15 for detecting the temperature of the mixed water is arranged on the lower side. Note that the communication flow path 13 is provided with a water inlet 16 to which a conduit 17 equipped with a solenoid valve 17a is connected to provide piping to a third supply destination.

Here, the mixing degree of hot water and water is determined by the rotation of the mixing valve 4, and the flow path switching and flow rate of the mixed water to the spout or shower head side are changed based on the rotation of the switching valve 5. The rotation of these valve bodies 4 and 5 is performed by the operation of electric motors 11 and 12 attached to each of them. Therefore, by controlling the operation of the electric motors 11 and 12 while measuring the flow rate using the flow rate detection device 14 and detecting the temperature of the mixed water using the temperature sensor 15, mixed water having the required flow rate and temperature can be obtained.

For this operation and control, an operation panel P is provided on the wall of the bathroom or the like, or is provided integrally with the main body 1. The operation panel P may be of any type as long as it has a function of setting the rotation angle of the mixing valve 4 and the switching valve 5 using a tact switch or the like. In other words, since the mixing valve 40 rotation angle determines the mixing ratio of water and hot water, it becomes a temperature setting factor for the mixed water, and the temperature sensor 1
Based on the detection signal No. 5, energization to the electric motor 11 is controlled so that the required mixed water temperature is obtained. In addition, since the switching valve 5 supplies mixed water to either the first outflow section 6 or the second outflow section 7, a switch is provided to select either of these, and the mixing to the outflow side changes depending on the rotation angle of the switching valve 50. Power supply to the electric motor 12 is controlled so that the flow rate of water can be set.

In the above configuration, when the switch on the operation panel P is operated, the electric motors 11 and 12 are energized. The rotation direction and rotation angle of the mixing valve 4 and the switching valve 5 due to the operation of these electric motors 11 and 12 are determined by the detection signals from the flow rate detection device 14 and the temperature sensor 15 so that the required flow rate and temperature are achieved. Control is set. Further, the rotation direction of the switching valve 5 is also set to be either the first outflow portion 6 or the second outflow portion 7. For this reason,
It can be easily operated using the switches on the operation panel P, without having to operate the handle as in the conventional case.

In addition, the gasket 10b that seals the peripheral surfaces of the mixing valve 4 and the switching valve 5 is attached to the pusher 51Q after the sleeve 10 is inserted.
c is screwed into the main body, the gasket 10b is assembled without twisting. For this reason, Patsukin 10b
There is no elasticity attenuation or breakage, and a good seal can be maintained. In particular, as on the switching valve 5 side, the protrusion 10
By preventing the sleeve 10 from rotating due to the engagement relationship between the groove 1a and the groove 1a, twisting and breakage of the packing 10b can be further prevented.

In this way, the holding structure that maintains the proper posture of the gasket 10b not only improves the sealing performance of the gasket 10b, but also allows the fluororesin formed on the sliding surface of the mixing valve 4 and the switching valve 5 to be attached to the sealing surface. There is no hit and an optimal valve structure can be obtained.

〔Effect of the invention〕

As explained above, in the switching valve of the present invention, by coating the sliding surface of the packing that contacts the circumferential surface of the switching valve with fluororesin, the sliding M friction between the switching valve and the packing is reduced. I'm keeping it small. For this reason, even if the gasket is brought into close contact with the rotating switching valve with high sealing pressure,
Only a small rotational force is required, and the switching valve can rotate smoothly. Therefore, the switching valve can be operated accurately in response to the rotation of the valve body without damaging the seal.
It is possible to accurately switch the flow path, finely adjust the flow rate, etc. Particularly, remarkable effects can be obtained in those in which the valve body is rotated by the output shaft of an electric motor.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a hot water mixing faucet incorporating the switching valve of the present invention, FIG. 2 is a sectional view taken along the I-r line in FIG. 1, and FIG. 3 is a longitudinal sectional view of the switching valve portion. Figure 4 shows the packing and sleeve that come into contact with the switching valve. On the other hand, FIG. 5 shows a conventional switching valve. 5: Switching valve (valve body) 5a: Outflow hole 5b = spindle 6.7: Outflow part 10b: Packing 10f = fluororesin patent jaw
Agent of Totoki Co., Ltd.
Masu Kobori (and 2 others) Figure 1 Figure 2 Figure 3 1 (Jf

Claims (1)

[Claims] 1. A hollow cylindrical valve body is rotatably housed in a valve chamber provided with a plurality of outflow parts, an outflow hole connected to any of the outflow parts is bored in the peripheral wall of the valve body, and the outflow hole is connected to one of the outflow parts. A switching valve characterized by a fluororesin coating on the sealing surface of the packing that seals around the hole.