JPH08210533A - Internal pressure abnormal increase preventing mechanism for mixing valve for water combination faucet - Google Patents

Abstract

PURPOSE: To release an internal pressure inside a downstream passage in the direction of an upstream passage by forming a relief passage connecting the downstream passage and the upstream passage with each other when a check valve element is opened by means of a valve guard. CONSTITUTION: In a water supply flow passage B, a cylinder body 10 is slid inside a valve case 7 with a check valve element 9 in the direction of an upstream passage P when a downstream passage S ranging from an open/close valve to the check valve element 9 in the upstream is sealed and an internal pressure is abnormally increased, and the check valve element 9 is brought into contact with a valve guard 12, and as a result, the check valve element 9 is pressed in the downstream passage S direction against pressing force of a check valve spring 13. In this way, the internal pressure in the downstream passage S can be released in the upstream passage P direction via a relief passage formed by opening the check valve element 9. Therefore, water leakage due to a high pressure from a fastening part serving as a joint part between the water supply pipe B and the valve case 7 or damage in the open/close valve 20 and the check valve element 9 can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for preventing an abnormal rise in internal pressure in a hot / water mixer tap provided with a check valve in the middle of a hot / water supply channel.

[0002]

2. Description of the Related Art Generally, in a hot and cold water mixing tap, a check valve is provided in a hot water supply flow path to a hot and cold water mixing chamber or in the middle of a water supply flow path, and a check valve is provided in each flow path from a downstream passage to an upstream passage. A mechanism to prevent backflow is adopted.

This mechanism is constructed by fitting a check valve core, which is a cylindrical body accommodating a check valve body, slidably in the axial direction of the valve case.

[0004]

For example, in a hot and cold water mixing valve of the type in which each handle of hot and cold water also serves as a flow rate control valve, the hot water supply pipe and the water supply pipe of the hot and cold water mixing valve body are respectively provided with the valves. The case is connected to form a hot water supply passage and a water supply passage. When only the hot water is supplied by closing the on-off valve located on the most downstream side of the water supply flow path, the downstream passage from the on-off valve to the upstream check valve body is sealed, and the sealed downstream side is closed. In the side passage, the internal pressure expands (expands) due to the transmission of heat to the water in the passage to a high pressure. Therefore, water leakage may occur from the tightening portion that is the connection portion between the water supply pipe and the valve case, and the on-off valve, the check valve core, and other devices may be damaged. Also, since the hot and cold water mixing valve body is made of a casting material,
This hot / water mixer tap main body is also damaged by the above-mentioned abnormal rise in internal pressure.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has been made in consideration of the above problems. It is an object of the present invention to provide a mechanism for preventing an abnormal rise of an object.

[0006]

In order to achieve the above object, the present invention is directed to a valve case which forms a communication path for connecting an upstream side passage and a downstream side passage of a hot water supply passage, and a shaft of the valve case. A cylindrical body that is slidably fitted in the axial direction, and a non-return member that is housed in the cylindrical body and is seated on a valve seat formed in the cylindrical body to prevent backflow from the downstream passage to the upstream passage. A valve body, a check valve spring for pressing the check valve body in the seating direction, and an upstream side of the cylinder body in the valve case,
The check valve body is provided coaxially with the axis of the valve case, and moves the check valve body toward the downstream passage when the cylinder slides in the direction of the upstream passage due to an abnormal increase in the internal pressure of the downstream passage. And presses the cylinder toward the downstream passage, and against the pressing force, the cylinder slides in the direction of the upstream passage due to the abnormal increase of the internal pressure. In some cases, there is provided a cylinder pressing spring that forms a relief passage that connects the downstream passage and the upstream passage when the check valve is opened by the valve retainer.

[0007]

When the supply of water is stopped and only hot water is supplied, the downstream passage of the water supply flow path formed by the valve case is sealed, and heat in the sealed downstream passage is supplied to the water in the passage. The transmitted internal pressure expands (expands) to a high pressure.

Under such an abnormal increase in the internal pressure, first, the cylinder body pressed by the cylinder body pressing spring toward the downstream passage is used to press the cylinder body inside the valve case together with the check valve body. It slides in the direction of the upstream passage against the pressing force of the spring.

Further, when the cylinder pressing spring contracts by a predetermined length during the sliding of the cylinder in the direction of the upstream passage, the check valve housed in the cylinder is pressed against the valve presser. Abut

Next, while only the cylinder slides further in the direction of the upstream passage against the pressing force of the cylinder pressing spring,
The check valve body is pressed by the valve retainer in the direction of the downstream passage with a force larger than the pressing force of the check valve spring, and the check valve body opens.

The internal pressure in the downstream passage can be released in the direction of the upstream passage through the relief passage formed by the valve opening.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. However, the present invention is not limited thereby.

FIG. 1 shows a hot and cold water mixing tap in which each of the handles 1 and 2 serves to control the flow rate of the hot and cold water. In FIG. 1, reference numeral 3 denotes a hot and cold water mixing chamber in a hot and cold water mixing tap main body 4. Hot water supply pipe 5 and water supply pipe 6 of mixer tap body 4
The hot water supply flow path A and the water supply flow path B are formed by connecting a valve case 7 (described later) to each of them. 8 is a faucet.

FIG. 2 shows a check valve core C. The check valve core C comprises a check valve body 9 and a cylinder 10 for accommodating the check valve body 9. A mechanism for preventing backflow from the downstream passage S to the upstream passage P is formed in each of the hot water supply passage A and the water supply passage B by being slidably fitted in the axial direction of the case 7. ing. The valve case 7 has a substantially cylindrical shape and has a female screw 1 in one opening 16.
7 is formed, and a male screw 19 is formed on the outer peripheral surface of the other opening 18.
The female case 17 of the valve case 7 is screwed into the male screw 30 formed in each of the hot water supply pipe 5 and the water supply pipe 6, so that the valve case 7 is connected to each of the pipes 5 and 6. Connected to form a connection.

Further, the check valve body 9 is housed in the cylindrical body 10 and is seated on an annular valve seat 11 formed on the lower surface of the cylindrical body 10 so as to move from the downstream passage S to the upstream passage P. Prevent backflow. A check valve spring 32 presses the check valve body 9 in the seating direction. The spring 32 is set so that the valve portion 9a of the check valve body 9 and the annular surface of the valve seat 11 are usually flush with each other.

Then, in addition to the check valve core C, the valve retainer 12
And a configuration in which only a cylinder pressing spring 13 is added. That is, the valve retainer 12 is formed in a generally trapezoidal shape in vertical section having an upper opening a and a lower opening b, and is coaxial with the axis of the valve case 7 on the upstream side of the cylinder 10 in the valve case 7. It is provided. Further, the tubular body pressing spring 13 has an annular surface 13a at one end thereof for the valve retainer 1
2 is fixed to the flange 12a constituting the bottom of
Further, the valve presser 12 is located inside the spring 13. The height M of the valve retainer 12 in the axial direction (see FIG. 3A)
Is usually set lower than the height N of the spring 13. The other end of the spring 13 has an annular surface 13b.
[See also FIG. 3 (A)].
When the annular surface forming the valve seat 11 comes into contact with 3b, the tubular body 10 is pressed toward the downstream passage S via the contact surface. The spring load of the spring 13 is set appropriately.

On the other hand, the diameter of the upper opening a of the valve retainer 12 and the diameter of the valve portion 9a of the check valve 9 are set to be substantially the same.
When 0 slides in the direction of the upstream passage P due to an abnormal increase in the internal pressure, the valve portion 9a comes into contact with the annular upper end portion 12b around the upper opening a of the valve retainer 12 [FIG. )reference〕.

In FIG. 1, reference numeral 20 denotes a water supply flow path B.
Is an on-off valve located on the most downstream side of the hot water supply path, and 21 is an on-off valve located on the most downstream side of the hot water supply flow path A. In FIG. 2, reference numerals 14 and 15 denote a cylindrical body 10 and a check valve body 9 respectively.
Is an O-ring formed on the outer peripheral surface of the.

The operation will be described below. When only the hot water is supplied by closing the on-off valve 20 located on the most downstream side of the water supply flow path B, the downstream passage S from the on-off valve 20 to the check valve body 9 on the upstream side is sealed, and this sealing is performed. Downstream passage S
Inside, the heat is transmitted to the water in the passage S, so that the internal pressure expands to a high pressure.

When the internal pressure Q rises abnormally, the cylindrical body 10 slides in the valve case 7 in the direction of the upstream passage P together with the check valve body 9 (see FIG. 3A).

Furthermore, when the tubular body pressing spring 13 contracts by a predetermined length h while the tubular body 10 is sliding in the direction of the upstream passage P, the check valve body housed in the tubular body 10 is compressed. 9
Abuts on the valve retainer 12 (see FIG. 3B).

Subsequently, as only the cylinder 10 slides further in the direction of the upstream passage P against the pressing force of the cylinder pressing spring 13, the check valve 9 is turned by the valve retainer 12. A force greater than the pressing force of the valve stop spring 32 is received in the direction of the downstream passage S. As a result, the check valve body 9 is opened, a relief passage E is formed, and the downstream passage S and the upstream passage P communicate with each other (see FIG. 3C).

As described above, in the present embodiment, when the downstream passage S from the on-off valve 20 to the upstream check valve element 9 in the water supply flow path B is closed and the internal pressure rises abnormally, the check is made. Along with the valve body 9, the cylinder body 10 is slid in the valve case 7 in the direction of the upstream passage P, and the check valve body 9 is brought into contact with the valve retainer 12 to resist the pressing force of the check valve spring 13. The check valve 9 is pressed in the direction of the downstream passage S, so that the internal pressure of the downstream passage S is reduced from the relief passage E formed by the valve opening operation of the check valve 9 to the upstream passage S. Can be opened in the direction of P.

Therefore, it is possible to prevent the occurrence of water leakage from the tightening portion, which is the connecting portion between the water supply pipe B and the valve case 7, and the damage of the on-off valve 20 and the check valve body 9 due to the high pressure. Further, it is possible to prevent the hot-water mixing stopper body 4 from being damaged.

The present invention can be applied to a hot and cold water mixing tap having a single lever.

That is, FIG. 4 shows an example in which the valve case 7 is connected to each of the hot and cold water supply pipes A and B of the single lever 40. Compared with the case of a single faucet, the valve case 7 has a thinner connecting portion with each of the hot water / water supply pipes A and B. As shown in FIG. 5, the check valve body 9 is accommodated therein. The structure in which only the valve retainer 12 and the cylinder body pressing spring 13 are added to the check valve core C composed of the cylinder body 10 is basically unchanged. 40 is a connection screw, 41 is an O-ring along the tapered surface 40a of the connection screw 40 inner surface, 42 is a washer, 43
Is packing.

[0027]

As described above, according to the present invention,
It is formed by a valve case with a simple and space-saving configuration that simply adds a valve retainer and a cylinder pressing spring to a check valve core consisting of a cylinder housing a check valve. When the downstream passage of the hot and cold water supply passage is closed and this internal pressure rises abnormally,
Along with the check valve, slide the cylinder toward the upstream passage,
Next, since the check valve body is brought into contact with the valve retainer to open the check valve body, the internal pressure of the downstream passage can be released in the direction of the upstream passage through the relief passage formed thereby.

Therefore, when the internal pressure is abnormally increased, it is possible to prevent water leakage from the tightened portion, which is a connection portion between the water supply pipe and the valve case, and to prevent damage to the check valve body, the cylindrical body, and other instruments. Can be prevented. Further, it is possible to prevent the main body of the hot and cold water mixer from being damaged. As a result, malfunction of the hot and cold water mixing tap can be eliminated.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an overall configuration showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a main part configuration in the embodiment.

FIG. 3 is a diagram for explaining an operation in the embodiment.

FIG. 4 is a diagram showing another embodiment of the present invention.

FIG. 5 is an explanatory diagram of a main part configuration in the another embodiment.

[Explanation of symbols]

7 ... Valve case, 9 ... Check valve body, 10 ... Cylindrical body, 11 ... Valve seat, 12 ... Valve retainer, 13 ... Cylindrical body pressing spring, 32
... check valve spring, C: check valve core, A: hot water supply passage, B: water supply passage, S: downstream passage, P: upstream passage, E: escape passage.

Claims (1)

[Claims] 1. A valve case forming a communication path connecting an upstream passage and a downstream passage of a hot and cold water supply passage, a tubular body slidably fitted in an axial direction of the valve case, and a cylinder A check valve body that is housed in the body and seats on a valve seat formed in the tubular body to prevent backflow from the downstream passage to the upstream passage; and a reverse valve that presses the check valve body in the seating direction. A valve stop spring and an upstream side of the cylinder in the valve case,
The check valve body is provided coaxially with the axis of the valve case, and moves the check valve body toward the downstream passage when the cylinder slides in the direction of the upstream passage due to an abnormal increase in the internal pressure of the downstream passage. And presses the cylinder toward the downstream passage, and against the pressing force, the cylinder slides in the direction of the upstream passage due to the abnormal increase of the internal pressure. And a cylinder pressing spring that forms a relief passage that connects the downstream passage and the upstream passage when the check valve is opened by the valve retainer. A mechanism for preventing abnormal rise in internal pressure at the stopper.