JPH01176864A - Hot water/cold water mixing valve - Google Patents

Abstract

PURPOSE:To rotate the valve body in a mixing valve smoothly by applying a fluororesin coating onto the end face of a packing contacting with the circumferential face of the valve body thereby reducing frictional resistance between the valve body and the packing. CONSTITUTION:A cold water flow-in chamber 8 and a hot water flow-in chamber 9 communicated with flow paths led out from a cold water flow-in section 2 and a hot water flow-in section 3 are formed respectively to the left and right of a valve body 1. A sleeve 10 having a hole 10a is arranged at a position on the cold water flow-in chamber 8 crossing perpendicularly with the axis of a mixing valve 4, and a packing 10b for sealing the circumference of a cold water flow-in hole 4a of the mixing valve 4 is fixed at the tip of the cold water flow-in chamber 8. A sleeve and a packing are arranged similarly in a hot water flow-in chamber 9. 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 mixing valve 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mixing valve used to mix hot water and water and send the mixture to a destination.

[Conventional technology]

A hot water mixing faucet is provided in the middle of piping to mix hot water and water at a predetermined ratio and send the mixture to a destination. Single-lever type mixing faucets are widely used to facilitate handle operation. This type has a structure in which two valve plates are overlapped.

On the other hand, especially as a hot water mixing faucet connected to a water heater,
Recently, a valve body in which a hollow cylindrical valve body is rotated by an electric motor has been developed. In this type, a hole is formed in the peripheral wall of the valve body through which water, hot water, or mixed water enters and exits, and the inside of the valve body is used as a passage for these. The flow path is opened and closed by rotating the valve body. By making the valve body cylindrical, it quickly receives the rotational force from the electric motor and smoothly opens and closes the flow path. In particular, the sliding friction when the hollow cylindrical valve body rotates is small compared to the sliding friction when two valve plates are arranged so as to overlap each other. Therefore, it becomes easy to finely adjust the mixing ratio of hot water and water, the temperature of mixed water, and the like.

[Problem that the invention seeks to solve]

By the way, for the seal against the valve body, water.

It is necessary to arrange the gasket in such a way that it contains holes through which hot water or mixed water can enter and exit. At this time, since the valve body is cylindrical, its circumferential surface is curved with a constant curvature in the circumferential direction, and has a linear shape in the axial direction. Therefore, the packing needs to have an end face shape that matches the outer shell of the circumferential surface of the valve body, and has a special shape different from a general flat packing or an O-ring.

In this way, the sealing pressure of the packing against the valve body needs to be considerably large in order to seal the valve body differently from a normal planar sealing surface.

Since the valve body rotates against the sealing pressure of the seal, the resistance due to sliding friction also increases. Therefore, when using a gasket made of ordinary rubber or the like, a gasket with a large capacity is required in order to provide some margin for the rotational driving force of the valve body by the electric motor.

Furthermore, due to an increase in sealing pressure due to the special shape of the packing, the valve body may not rotate smoothly. Particularly, when the valve body is rotated by a small angle in a short period of time in order to slightly adjust the temperature of the mixed water, there is a problem that good operation cannot be performed.

Therefore, the present invention reduces the frictional resistance between the valve body and the gasket by coating the end face of the gasket that comes into contact with the circumferential surface of the valve body with a fluororesin, thereby allowing the valve body of the hot water mixing valve to rotate smoothly. The purpose is to

[Means for solving problems]

In order to achieve the object, the hot water mixing valve of the present invention rotatably accommodates a hollow cylindrical valve body in a valve chamber equipped with a water inflow part and a hot water inflow part, and a plurality of hot water mixing valves connected to each of the inflow parts. An inflow hole is formed in the peripheral wall of the valve body, and a packing whose end surface contacting the peripheral wall of the valve body is coated with fluororesin is provided in the valve chamber.

〔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 hot water mixing valve of the present invention, and FIG. 2 is a sectional view taken along the line II in FIG.

The main body 1 of the hot water mixing faucet is stored inside the box,
Install it in a convenient location for hot water supply, such as a bathroom or kitchen. On the left and right sides of the upper end of the main body 1, short pipes are raised to form a water inlet 2 and a hot water inlet 3, respectively.The water inlet 2 is connected to a water supply pipe 2a, and the hot water inlet 3 is connected to a water heater, etc. The communicating hot water supply pipes 3a are connected to each other. 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 fat and has a cylindrical shape with an open bottom end.As shown in FIG. is protruding spindle 4C. 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 inflow hole 4a and the hot water inflow hole 4b. Ru. 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 are
The water inflow section 2 and the hot water inflow section 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 tOa.
is arranged in a position perpendicular to the axis of the mixing valve 4, and a gasket 10b for sealing around the water flow hole 4a of the mixing valve 4 is attached to the tip thereof.

In addition, in order to seal the circumferential surface of the cylindrical mixing valve 4, the seal lOb has a curved sealing surface and requires directionality, so the seal lOb has a structure that does not rotate it when attaching the sleeve 10. shall be. That is, the sleeve 10 is inserted from the outside of the main body 1 and is integrally fixed to the main body 1 by a bushing 10c screwed into the main body 1. Therefore, if the posture of the bushing 10b is set correctly to fit the circumferential surface of the mixing valve 4, the rotation when screwing in the bushing 10c will not be transmitted to the bushing 10b, thereby preventing twisting of the bushing 10b. It can be incorporated without any problem. On the other hand, the hot water inlet chamber 9 also has a mechanism for sealing around the hot water inlet hole 4b of the mixing valve 4.
Sleeves and packing similar to the sides are placed.

As shown in FIG. 3, the opening of the water inflow hole 4a of the mixing valve 4 has a chamfered portion 4 with a gently curved opening edge.
It is set as e. Since this chamfered portion 4e is a portion that comes into contact with and separates from the packing 10b, peeling and wear of the packing 10b are reduced when the mixing valve 4 rotates. Therefore, the influence on the gasket 10b that seals the peripheral surface of the mixing valve 4, which rotates frequently, is reduced, and durability is improved. Similarly, it is preferable that the hot water inflow hole 4b of the mixing valve 4 is also chamfered.

FIG. 4 is a perspective view showing the packing that contacts the peripheral surface of the mixing valve separated from the sleeve. Patsukin 10b is
In order to seal the circumferential surface of the cylindrical mixing valve 4 mentioned above,
It is curved in one direction. In addition, in order to reinforce this curved surface, the ring 10e is connected to the sleeve 10 and the packing 1.
It is inserted between 0b and 0b. In order to improve the sliding on the peripheral surface of the mixing valve 4, the sliding surface of the packing 10b is coated with a fluororesin 10f. This fluororesin 10f coating can be integrally molded on the sliding surface of the packing 10b when it is manufactured by vulcanization.The fluororesin 10f reduces the frictional resistance between the mixing valve 4 and the packing 10b. As a result, the rotational operation of the mixing valve 4 is performed smoothly.As a result, the responsiveness of the mixing valve 4, which uses the electric motor 11 as its driving source, is improved, and operations such as fine adjustment of the mixed water temperature can be performed quickly and accurately. be exposed.

The above mixing valve 4 and switching valve 5 are arranged coaxially. By rotating the mixing valve 4 and the switching valve 50, 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 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 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 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 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.

In addition, the gasket 10b that seals the surrounding surface of the mixing valve 40 is
Since the bushing 10c is screwed into the main body 1 after inserting the sleeve 10, the packing 10b is assembled without twisting. Therefore, the elasticity of the packing 10b is not attenuated or broken, and a good seal can be maintained. Further, by preventing the sleeve 10 from rotating due to the engagement relationship between the protrusion 10d and the groove provided on the inner wall of the water inflow chamber 8, twisting and breakage of the packing 10b can be further prevented.

In this way, the holding structure that maintains the proper posture of the packing 10b not only improves the sealing performance of the packing 10b, but also eliminates uneven contact with the sealing surface of the fluororesin formed on the sliding surface with the mixing valve 4. An optimal valve structure can be obtained.

〔Effect of the invention〕

As explained above, in the mixing valve of the present invention, the end face of the packing that contacts the circumferential surface of the valve body is coated with fluororesin, thereby reducing the sliding friction between the valve body and the packing. . Therefore, even if the packing is brought into close contact with the rotating valve body with a large sealing pressure, the rotational force is small, and the valve body can rotate smoothly.
It is possible to operate the mixing valve accurately in response to the rotation of the valve body, without damaging the gasket, and to accurately make fine adjustments to the mixing ratio of hot water and water, the temperature of the mixed water, and the flow rate. Particularly, remarkable effects can be obtained when 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 mixing valve of the present invention, Fig. 2 is a sectional view taken along the line II in Fig. 1, and Fig. 3 is a sectional view of the mixing valve portion. Figure 4 shows the gasket that seals the mixing valve. 2: Water inflow part 3: Hot water inflow part 4: Mixing valve (valve body) 4a, 4b: Inflow hole 10b: Packing
10 [: Fluororesin patent applicant Totoki Kiki Co., Ltd. Agent Kobori
Masu (2 others) Figure 1 Figure 4

Claims (1)

[Claims] 1. A hollow cylindrical valve body is rotatably housed in a valve chamber equipped with a water inflow part and a hot water inflow part, and a plurality of inflow holes connected to each of the inflow parts are bored in the peripheral wall of the valve body. A hot water mixing valve, characterized in that the valve chamber is provided with a packing whose end surface contacting the peripheral wall portion of the valve body is coated with fluororesin.