JPH01176867A - Changeover valve - Google Patents

Abstract

PURPOSE:To reduce frictional resistance between a valve body and a seal ring by applying fluororesin coating onto the circumferential wall section of the valve body in contact with a packing arranged in a valve chamber. CONSTITUTION:A changeover valve 5 is cylindrical and a mixed water flow-out hole 5a is made through the circumferential wall thereof. Sealing mechanisms having sleeves 10 and packings 10b are arranged for first and second flow-out chambers 6a, 7a arranged at the opposite sides of the changeover valve 5. Fluororesin coating is applied onto the circumferential face of the valve body contacting with the packing 10b. Frictional resistance between the valve body and the packing 10b is reduced through the fluororesin coating 5c thus realizing smooth rotary motion of the valve body 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 switching valve that has been used in the past. A cylindrical valve body 51 is rotatably provided inside the valve chamber 50, an opening located at the upper end or lower end of this valve body 51 serves as an inlet for water or hot water, and a hole 52 provided in the peripheral wall serves as an outlet. There is. Flow paths 53 and 54 having different supply destinations are formed in the valve chamber 50, and the outflow hole 52 is connected to these flow paths 53.54.
54. The valve body 51 is rotated so as to be aligned with either one of the positions 54 and 54. By this operation, the flow path 53 or 54 is aligned with the outflow hole 52, and water or hot water is sent 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 seal member different from flat packing, QIJ ring, 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. This sharp opening edge allows
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.

[Problems to be Solved by the Invention] 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. It has become. 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, in order 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 rotation operation cannot be performed smoothly due to the aforementioned increase in seal pressure.

Therefore, an object of the present invention is to reduce the frictional resistance between the valve body and the seal ring by forming the circumferential surface of the valve body with a fluororesin, thereby allowing the valve body to rotate smoothly.

[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 parts, and an outflow hole connected to the outflow part is connected to the valve body. A peripheral wall of the valve body is bored in the peripheral wall of the valve body, and a peripheral wall portion of the valve body that comes into contact with a gasket provided in the valve chamber 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-1 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 inflow part 2 and a hot water inflow part 3, respectively.The water inflow part 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 1, respectively, and the switching valve 5 switches the flow path to the first outflow section 6 and the second outflow section 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. As shown, there is a water inlet hole 4a on the upper side.
A hot water inflow hole 4b is provided on the lower side, and a spindle 4C is protruded from the upper end. 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 communicating with the flow paths from the water inflow section 2 and the hot water inflow section 3 are formed on the left and right sides of the main body l so as to correspond to the water inflow hole 4a and the hot water inflow hole 4b. be done. Note that the opening centers of the water inflow hole 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 communicate with the water inflow part 2 and the hot water inflow part 3 at different valve opening degrees, making it possible to mix hot water and water. becomes.

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.

Further, in order to seal the circumferential surface of the cylindrical mixing valve 4, the sealing surface of the packing 10b is curved and requires directionality, so when the sleeve 10 is attached, the sealing surface is not rotated. shall be. That is, the sleeve 10 is inserted from the outside of the main body 1 and is integrally fixed by a pusher LloC screwed into the main body 1. For this reason,
If the posture of the gasket 10b is set correctly to fit the circumferential surface of the mixing valve 4, the rotation when screwing in the pusher xlQc will not be transmitted to the gasket 10b, so it can be assembled into the gasket 10b without twisting. Can be done. 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 metal or synthetic resin and has a cylindrical shape with an open upper end, and has a mixed water outflow 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, which 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 therebetween. These first. Seal mechanisms including the sleeve 10, packing 10b, etc. described above are arranged in the second outflow chambers 6a, 7a, respectively.

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 10d 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 inserting and setting the sleeve 10, the sleeve 10 will not rotate even if the pusher 5lQc is screwed in.
The packing 10b does not twist at all.

FIG. 4 is a perspective view showing the switching valve. The valve body 5 is coated with a fluororesin 5c on the circumferential surface that comes into contact with the packing 10b. Alternatively, the entire circumference of the valve body 5 may be coated with fluororesin. Furthermore, the valve body 5 may be made of fluororesin. The fluororesin 5C reduces the frictional resistance between the valve body 5 and the packing 10b, allowing the valve body 50 to rotate 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. The flow path to the second outlet 6.7 is switched. Then, electric motors 11 and 12 for rotationally driving the mixing valve 4 and the switching valve 5 are respectively arranged,
The rotation of the output shaft can be transmitted to the spindles 4c and 5b via reduction gears 11a and 12a.

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 spa/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. By controlling the operation of the electric motors 11 and 12, mixed water at 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 rotation angle of the mixing valve 4 determines the mixing ratio of water and hot water, it becomes a temperature setting factor for the mixed water, and the temperature sensor 15
Based on the detection signal, the power supply 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 flow rate to the outflow side changes depending on the rotation angle of the switching valve 5. Power supply to the electric motor 12 is controlled so that the flow rate of the mixed water can be set.

In the above configuration, when a 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.

Further, the gasket 10b that seals the surrounding surfaces of the mixing valve 4 and the switching valve 50 is attached to the pusher 510 after the sleeve 10 is inserted.
Since C is screwed into the main body 1, the packing lOb 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 tab can be further prevented.

In this way, the holding structure that maintains the proper posture of the packing tab not only improves the sealing performance of the packing 10b but also prevents uneven contact between the sealing surface and the fluororesin packing lOb formed on the sliding surface of the switching valve 5. An optimal valve structure can be obtained.

〔Effect of the invention〕

As explained above, in the switching valve of the present invention, the sliding friction between the valve body and the seal is reduced by coating the circumferential surface of the valve body with which the seal contacts with a fluororesin. For this reason, even if the packing is brought into close contact with the rotating valve body under high sealing pressure, the rotational force is small, and the rotating movement of the valve body can be performed smoothly, without damaging the packing, and the flow can be maintained. It becomes possible to accurately switch paths, finely adjust the flow rate, etc. Particularly, remarkable effects can be obtained in those in which the valve body is rotated by 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 line I-1 in FIG. 1, and FIG. 3 is a longitudinal sectional view of the switching valve portion. FIG. 4 shows the main body of the switching valve. On the other hand, FIG. 5 shows a conventional switching valve. 5: Switching valve (valve body) 5a: Outflow hole red: Fluororesin 6, 7: Outflow portion lQb: Packing Patent applicant Totoki Kiki Co., Ltd. Representative Masu Kobori (and 2 others) Figure 1, Figure 21 Figure 3 + 5 Figure 4 of 5

Claims (1)

[Claims] 1. A hollow cylindrical valve body is rotatably housed in a valve chamber having a plurality of outflow portions, and an outflow hole connected to the outflow portion is bored in the peripheral wall of the valve body and provided in the valve chamber. A switching valve characterized in that a peripheral surface portion of the valve body with which the packing contacts is made of fluororesin.