JPH05607Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is an improvement of a check valve arranged in the water supply passage on the primary side of the on-off valve part of a hot/cold water mixing faucet in which a water chamber and a bath chamber are close to each other. Regarding.

[Prior Art] For example, there is a single-lever type mixing faucet. 4 and 5 show the general structure of a single-lever type hot water mixing faucet 1. FIG. That is, in this hot water mixing faucet 1, the inside of the faucet main body 1a is divided by partition walls 2 and 3 into a water chamber 4, a hot water chamber 5, and a hot water mixing chamber 6. In a valve chamber 7 communicating with these chambers 4, 5, and 6, there is disposed a flow rate regulating valve 10 which is made of a set of two ceramic fixed plates 8 and a movable plate 9 superimposed in a watertight and slidable manner. It has been done. The fixing plate 8 has a water chamber 4 on its overlapping surface.
A water inlet 8a leading to the hot water chamber 5, a hot water inlet 8b leading to the hot water chamber 5, and a mixed hot water outlet 8c leading to the mixing chamber 6.
is opened. The movable plate 9 has a water inlet 8a of the fixed plate 8 and a mixed hot water outlet 8 on the overlapping surface.
A distribution flow path 9a is formed for turning ON/OFF the communication state with c and the communication state between the water inlet 8a of the fixed plate 8 and the mixed hot water outlet 8c. The water chamber 4 and the hot water chamber 5 are connected to a water supply pipe 13 and a hot water supply pipe 14 via legs 11 and 12, respectively.
An upstream stop valve 15 and a downstream check valve 16 are arranged within the legs 11 and 12. Leg 1
1 and 12 and hot water supply pipes 13 and 14 are so-called hot water supply passages. The check valve 16 is used to prevent hot water from flowing back toward the supply side if the pressure in the water chamber 4 or the hot water chamber 5 increases for some reason. A cylindrical case body 17 with one end closed and an inlet 17a formed on the side surface, and the case body 17
The valve body 19 is biased by a check spring 18 so as to be normally seated on a valve seat 17c forming an outlet 17b. The temperature of the hot water is adjusted by rotating the lever 17 left and right to adjust the amount of hot water flowing into the mixing chamber 6.

[Problems to be solved by the invention] However, in the hot water mixing faucet 1 in which the check valves 16, 16 are arranged, when only hot water is being supplied, the partition walls 2 and 3 and the faucet body 1a The water in the water chamber 4 is heated through the outer shell of the tank and expands. At this time, the water chamber 4 is in a sealed state by the flow control valve 10 and the check valve 16. As a result, the pressure in the water chamber 4 increases abnormally due to the expansion of the water in the water chamber 4, and the ceramic valve body is pressed into contact with the ceramic valve body more than necessary, resulting in poor slippage between the two and making it difficult to operate the handle 17. It had the disadvantage of becoming. In addition, due to the repeated history of cooling and heating cycles due to repeated use, the faucet body 1a
However, it had drawbacks such as early fatigue failure. The pressure inside the water chamber 4 is sometimes 100
It could even reach Kgf/ ^cm2 .

[Purpose of the invention] In order to solve the above-mentioned conventional problems, the present invention is designed to release expanded water corresponding to the pressure increase from the water chamber to the water supply pipe when the pressure inside the water chamber increases. The purpose of this invention is to provide a check valve for mixed faucets.

[Means for solving the problems] The means of the present invention for solving the above problems are as follows:
It is arranged in the water supply passage on the primary side of the on-off valve part of a hot water mixing faucet where the water chamber and the hot water chamber are close to each other, and one end side is closed, an outlet is formed on the other end side, and the side surface is closed. It comprises a cylindrical case body in which an inflow port is formed, and a valve body urged by a check spring so as to always sit on a valve seat formed at the periphery of the outflow port opening of the case body. In the check valve, a relief spring is disposed inside the main body case to transmit a repulsive elastic force to the case main body and the valve body, and the valve body is configured to pass through the outlet in a force-fitted state. and has a reciprocating stroke that moves against the elastic repulsive force of the relief spring from a passing position of the outlet to an internal position of the main body casing where the inlet and the outlet are in communication. It is.

[Function] When only hot water is continuously supplied, the water sealed in the water chamber expands and its pressure gradually increases. Then, the pressurized expanded water pushes the valve body of the check valve against the elastic repulsive force of the relief spring and moves it to a position where the inlet and outlet of the main body casing are in communication. , flows out to the inlet with lower pressure. As a result, it is possible to prevent the pressure inside the water chamber from becoming abnormally high.

[Explanation of Embodiments] The structure of the check valve for hot and cold water mixing faucets according to the present invention (hereinafter referred to as the "invented check valve") will be explained below based on the embodiments shown in FIGS. 1 to 3. It is as follows.

The check valve 26 of this invention is the leg part 11 of the hot water mixing faucet.
(See FIG. 4) and installed in the water supply channel 40. Case body 2 constituting the check valve 26 of the present invention
7 is formed in a cylindrical shape, a cap 21 is screwed to one end, an outlet 27b is opened at the other end, a valve seat 27c is formed around the opening of the outlet 27b, and inlets 27a, 27a are formed on the side. It is opened, and a communication passage 27e is formed inside with a diameter larger than the inner diameter of the outlet 27b. A filter 25 is provided on the outer periphery of the casing body 27 to cover the inflow ports 27a, 27a...
is fitted.

A guide tube 22 is slidably fitted inside the case body 27. The guide cylinder 22 has a valve stem 3.
The head portion 30a of the valve stem 30 is slidably fitted therein, and the inner flange portion 22b for preventing the valve stem from being pulled out is fitted into the head step portion 30b of the valve stem 30.
It is provided so as to protrude so as to come into contact with the. The sliding stroke of the head 30a within the guide tube 22 is the same as that of the valve seat 2.
Valve body 29 (described later) seated at 7c (see Fig. 1)
The length is determined such that it can pass through the outlet 27b in a force-fitted state and move forward and backward to a position (see FIG. 3) where the inlet 27a and the outlet 27b are brought into communication.

A check spring 28 fitted onto the guide tube 22
The outer flange 22a of the guide tube 22 and the case body 2
With both ends abutting against the inner flange 27d of 7, the guide tube 22
It stores repulsion elastic force so as to urge the body inwardly.

The valve body 29, which is seated on the valve seat 27c of the case body 27, has an O-ring 23 made of an elastic material fitted into an annular groove 29a. The shape of the O-ring 23 is such that the O-ring 23 is normally seated on the valve seat 27c under the repulsive elastic force of the check spring 28.
It is appropriately determined that when a strong pressing force of the expanded water generated on the downstream side 40a of the water supply channel 40 acts on the valve body 29, the O-ring 23 passes through the outlet 27b in a force-fitted state.

Inside the main body case 27 is a relief spring 24 that fits the valve shaft 30 and the guide tube 22.
is located. The free length dimension L of the relief spring 24 is such that immediately after the O-ring 23 starts to be force-fitted into the outlet 27b, both ends of the relief spring 24 are connected to the spring seat 2 of the valve body 29.
9b and the inner flange 27d of the case body 27, as appropriate.

Next, the operation of the check valve 26 will be explained. In the normal check valve 26, as shown in FIG. 1, the repulsive elastic force of the check spring 28 is transmitted to the valve shaft 30 via the guide tube 22, and the valve body 29 is attached to the valve seat 27c.
O-ring 23 is seated. Flow rate control valve 10
When the downstream side 40a of the water supply channel 40 is brought into a low pressure state by the operation (see FIG. 4), the valve body 29 receives the water pressure on the upstream side 40b of the water supply channel 40, as shown in FIG. The inlet 27 moves against the check spring 28 in the direction of separating from the seat 27c.
A and the outflow port 27b are brought into communication and water supply is started. When only hot water is continuously supplied by operating the flow control valve 10 (see Fig. 4), the water chamber 4 and water supply channel 40 of the hot water mixing faucet body 1a (see Fig. 1) are The water sealed on the downstream side 40a expands and its pressure increases. Then, in the present check valve 26, as shown in FIG.
It is force-fitted and pressed into the outlet 27b of the case body 27 against the elastic repulsive force of 4, and moves to a position where the inlet 27a and the outlet 27b are in communication. As the valve body 29 moves, the expanded water passes through the outflow port 27b, the communication path 27e, and the inflow port 27a, as shown by the white arrow in the figure, and passes through the water supply channel 4.
0 is discharged to the upstream side 40b. When the expansion water pressure drops below a predetermined pressure (for example, 5 to 10 Kg/cm ² ), the valve body 29 is pushed back by the repulsive elastic force of the relief spring 24, passes through the outlet 27b, and returns to the seating position (Fig. 1). (see).

[Effects of the invention] As detailed above, in the present invention, even if expanded water occurs in the water chamber of a hot water mixing faucet, the expanded water can be relieved to the upstream side of the water supply channel. , it is possible to prevent the pressure in the water chamber from increasing, and there will be no inconvenience such as difficulty in operating levers, etc. Furthermore, the faucet body does not get fatigued and prematurely break due to repeated cooling and heating cycles due to repeated use.

[Brief explanation of the drawing]

Figures 1 to 3 show examples of the check valve according to the present invention. Figure 1 is a right sectional view showing the backflow prevention state, and Figure 2 is the state in which water is guided from the inlet to the outlet. FIG. 3 is a right sectional view showing expanded water being guided from the outlet to the inlet, and FIGS. 4 and 5 show a conventional hot water mixing faucet. FIG. 4 is a front view showing the main part in section, and FIG. 5 is a right side view showing the main part in section. 24...Relief spring, 27...Case body, 27a...Inflow port, 27b...Outflow port,
27c...Valve seat, 28...Check spring, 2
9... Valve body, 40... Water supply channel.

Claims (1)

[Scope of utility model registration request] It is arranged in the water supply passage on the primary side of the on-off valve part of a hot water mixing faucet where the water chamber and the hot water chamber are close to each other, and one end side is closed, an outlet is formed on the other end side, and the side surface is closed. It comprises a cylindrical case body in which an inflow port is formed, and a valve body urged by a check spring so as to always sit on a valve seat formed at the periphery of the outflow port opening of the case body. In the check valve, a relief spring is disposed inside the main body case to transmit a repulsive elastic force to the case main body and the valve body, and the valve body is configured to pass through the outlet in a force-fitted state. and has a reciprocating stroke that moves against the elastic repulsive force of the relief spring from a passing position of the outlet to an internal position of the main body casing where the inlet and the outlet are in communication. A check valve for hot and cold water mixing faucets.