JP2646940B2 - Mixing valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is widely used in water heaters, and is a mixing valve for mixing hot and cold water to supply hot water at a suitable temperature. And a mixing valve in which a valve element is disposed.

[0002]

2. Description of the Related Art Conventionally, as a mixing valve used in a motor-driven hot / water mixing device at a hot water supply point, two valve bodies are provided on one drive shaft (valve shaft), and both valve bodies are provided with different valves. A water valve and a hot water valve are formed on the downstream side of the flow with respect to the seat, and the valve shaft is driven to control the opening degree of the water valve and the hot water valve including the closed position. A single-shaft mixing valve with a closing function (hereinafter, simply referred to as a mixing valve) for adjusting the flow rates of high-temperature hot water and cold water to be mixed and adjusting the temperature of hot water flowing out of an outlet is often used.

In such a mixing valve, the valve shaft is further moved from the position where the valve body abuts on the valve seat in order to reliably maintain the closed state when the water valve or hot water valve is brought to the closed position. The valve body is provided so as to be movable with respect to the valve shaft, and the valve body moves with respect to the valve shaft when the valve shaft moves (for example, Japanese Unexamined Patent Publication No. Japanese Patent Application Laid-Open No. 3-107676), or a device in which a valve seat is installed movably with respect to a casing, and the valve seat moves with the valve body and the valve shaft with respect to the casing (for example, see Japanese Patent Application Laid-Open No. 3-107676). is there.

[0004]

However, in the above-described conventional mixing valve, the valve element is mounted so as to be movable with respect to the valve shaft, or the valve seat is installed so as to be movable with respect to the casing. However, there is a problem that the mechanism becomes complicated and it is difficult to reduce the size of the mixing valve. Further, there is a possibility that dust or the like contained in the water may be bitten into the sliding portion to damage the sliding surface, or smooth movement may not be possible.

SUMMARY OF THE INVENTION An object of the present invention is to provide a mixing valve which can simplify the structure to promote downsizing, and can smoothly operate to perform opening adjustment including reliable closing. .

[0006]

In order to achieve the above object, a mixing valve according to the present invention comprises a mixing chamber in which a water valve seat and a hot water valve seat are opposed to each other. In a single-shaft type mixing valve in which a water valve element and a hot water valve element are respectively arranged on the downstream side of the flow with respect to the valve seat , they are fitted in the respective valve seats in the closed position and are in a closed state. A water valve element and a hot water valve element each having a fitting portion and a tubular portion formed to have a smaller diameter than the fitting portion are provided. fixed to the valve shaft and smaller than the distance between the use valve seat, the outer periphery of the tubular portion of both the valve body fixed to the valve shaft, and having a larger outer diameter than the opening diameter of each of the valve seats , The outer diameter of both valves
The inner diameter of the valve is small and it is slidable around the cylindrical part of the valve.
A cylindrical sliding portion that is fitted to the valve seat, and two flanges urged in the valve seat direction are slidably fitted to the valve body, respectively. The degree of opening of the hot water valve seat can be adjusted from fully open to fully closed, and both valve seats are not simultaneously closed at the same time, and both valve seats can be simultaneously adjusted to an opening other than fully closed. The mixing ratio of hot and cold water can be adjusted, and in the closed position where each valve element fits into the valve seat, when the valve element enters the valve seat, the flange fitted to the valve element forms a valve seat. The opening is securely closed by contacting the downstream side of the valve, and only one of the valve seats is securely closed . In addition, fitting of valve body
The water flow hits only the part located outside the joint.
Because the pressure receiving area of the collar is small, the urging force is small
Can be designed easily.
You. Furthermore, the cylindrical portion of the valve body causes the valve body to
The angle, that is, the angle of the valve body with respect to the valve seat
It is possible to obtain a closed state by fitting the valve body into the valve seat
Can be slidably fitted to the outer periphery of the cylindrical portion of the valve body.
By providing the cylindrical sliding part, the urging force of the urging means is
Even if it is added unevenly in the circumferential direction of the
Is made along the outer circumference of the tubular part of the body, and the angle of the flange to the valve seat
The degree is held accurately and the door is securely closed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, a casing 1 of a mixing valve includes an inner member 1
A cold water flow path 2, a high-temperature hot water flow path 3, and a mixing chamber (or valve chamber) 4 formed by A. The cold water flow path 2 includes a cold water inlet 20 connected to a cold water supply path, A water valve seat 21 that opens toward the mixing chamber 4 is provided. Hot water channel 3
Is a hot water inlet 30 connected to the hot water supply passage, a hot water valve seat 31 opening toward the mixing chamber 4, and protruding from a side wall facing the hot water valve seat 31 and opposite to the mixing chamber 4. And a bottomed cylindrical guide 32. The mixing chamber 4 is a mixed hot water outflow passage.
It has 41.

A valve shaft 5 is disposed so as to be axially movable through the cold water flow path 2, the hot water flow path 3, and the mixing chamber 4, and a valve body mounting portion 51 formed at an appropriate position of the valve shaft 5. The water valve element 6 and the hot water valve element 7 are fitted to the spring member 11 and positioned downstream of the flow of the water valve seat 21 and the hot water valve seat 31, that is, on the mixing chamber 4 side.
Thus, the two valve bodies 6 and 7 are pressed and fixed to the step portion of the enlarged diameter portion 53 formed at one end of the valve body mounting portion 51. The other end of the valve body mounting portion 51 of the valve shaft 5 has a smaller diameter than the valve body mounting portion 51 and is slidably fitted into the hole of the guide 32 in the high-temperature hot water flow path 3.
The guide portion 54 has a larger diameter following the enlarged diameter portion 53, a screw portion 55 having a smaller diameter than the guide portion 54 and having a thread groove on the outer periphery, and a drive driven by the stepping motor 13. A gear portion 56 meshing with a gear (not shown) is formed, a plurality of annular grooves 57 are provided in the guide portion 54, and O-rings 58 are fitted therein.

The cold water flow path 2, ie, the mixing chamber 4 of the inner member 1A
The support intermediate cylinder 12 is fitted and fixed to the opening on the opposite side to the opening. The inner hole of the support intermediate cylinder 12 has an intermediate guide portion 121 in which the guide portion 54 of the valve shaft 5 is slidably fitted, and an inner surface thereof. An intermediate threaded portion 122 in which a threaded portion is formed and into which the threaded portion 55 of the valve shaft 5 is screwed. An annular groove 83 is formed in the outer periphery of the support intermediate cylinder 12, and an O-ring is fitted therein.

In FIG. 2, a water valve 6 (hot water valve 7)
Is formed to have substantially the same outer diameter as the opening of the water valve seat 21 (the hot water valve seat 31). The opening is adjusted by the distance from the water valve seat 21 (the hot water valve seat 31). The water fitting portion 61 (the hot water fitting portion 71) which is fitted into the valve seat 21 (the hot water valve seat 31) to be closed.
And a cylindrical portion 62 (72) formed to have a smaller diameter than the water fitting portion 61 (hot water fitting portion 71) and fitted to the valve body mounting portion 51. An annular groove 63 (73) is formed on the outer periphery of 72), and an O-ring 64 (74) is fitted in the annular groove 63 (73).

The water side flange 8 (hot water side flange 9) is opposed to the water valve seat 21 (hot water valve seat 31), and is in contact with the valve seat to be closed. ) And a water-side cylinder portion 82 (hot-water cylinder portion 92) slidably fitted to the outside of the cylindrical portion 62 (72) of the water valve body 6 (hot-water valve member 7). The water-side seating portion 81 is urged in the direction of the water valve seat 21 by the coil spring (urging means) 10 in the direction of the hot-water valve seat 31.
The back surface of the (hot water seating portion 91) serves as a stopper for the water flange 8 (hot water flange 9). In this embodiment, as shown in the figure,
Although both ends of the coil spring 10 are in contact with the back surface of the water side seating portion 81 and the back surface of the hot water side seating portion 91, the springs are formed separately, and one end is individually fixed to the valve body. The other ends may be fixed to the back surfaces of both seating portions, respectively.

Next, the operation will be described. When the valve shaft 5 is driven rightward in the drawing, the water fitting portion of the water valve
61 approaches the water valve seat 21 to reduce the opening,
When the tip of 61 reaches the inside of the water valve seat 21, it is closed,
Further, by being driven rightward by a margin, the water fitting portion 61 enters the water valve seat 21 and the water-side seating portion of the water-side flange 8.
Since the abutment portion 81 is in contact with the water valve seat 21 and separates from the back surface of the water fitting portion 61 and slides in a direction to compress the coil spring 10, the water-side seating portion 81 is moved by the restoring force of the coil spring 10 to the water valve seat portion. The water valve seat 21 is securely closed by being strongly pressed by the water valve seat 21. In addition, when closing the hot water side valve, the same operation can be performed by moving the valve shaft 5 to the left in the drawing.

[0013]

Since the present invention is constructed as described above, the number of parts can be reduced, the size can be reduced, and the production cost can be reduced. In addition, there is no danger of catching or sticking due to dust or the like, and reliability can be improved. further,
Since the pressure receiving area is small, only a small urging force is required, so that the urging means can be easily designed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a mixing valve according to the present invention.

FIG. 2 is an enlarged sectional view of a portion II of the mixing valve according to the present invention.

[Explanation of symbols]

1 mixing valve casing, 2 cold water flow path, 3 hot water flow path, 4 mixing chamber 5 valve shaft, 6 water valve body, 7 hot water valve body, 8 water side flange,
9 Hot water side flange 10 Spring (biasing means), 11 Valve member fixing spring member

Claims (1)

(57) [Claims] A mixing chamber having a water valve seat and a hot water valve seat facing each other is provided, and a water valve body and a hot water valve are provided downstream of the flow with respect to the water valve seat and the hot water valve seat. 1 in which the valve elements are arranged
In-shaft mixing valves, each of the water valve body and water having a cylindrical portion formed on a smaller diameter than the fitting portion and a fitting portion for engaging and closed state within the valve seat in the closed position The valve body is fixed to the valve shaft with the distance between the fitting portions of both valve bodies smaller than the distance between the water valve seat and the hot water valve seat. the outer periphery of the cylindrical portion, and having a larger outer diameter than the opening diameter of each of the valve seats, than the outer diameter of the valve bodies
With a small inner diameter, it is slidably fitted on the outer circumference of the cylindrical part of the valve body
A mixing valve having a cylindrical sliding portion to be fitted, wherein two flanges urged in a valve seat direction are respectively slidably fitted to a valve body.