JPH0314608Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is designed to prevent abnormal pressure rise in the water chamber in a single-lever mixer faucet in which the water chamber and the hot water chamber are placed close to each other. The present invention relates to a check valve that absorbs and relieves

[Conventional technology]

For example, there is a single-lever type mixing faucet in which a water chamber and a bath chamber are arranged close to each other. 4 to 6 show the general structure of a single-lever type hot water mixing faucet 1. FIG.
That is, this hot water mixing faucet 1 has a faucet main body 1a.
A water chamber 2, a water chamber 3, a mixing chamber 4, and a valve chamber 5 are defined within the valve chamber 5, and two valve seats 6 and a valve body 7 made of ceramic are arranged in the valve chamber 5. The valve seat 6 has a hole 2a communicating with the water chamber 2 and a hole 3 communicating with the water chamber 3.
a (see FIG. 7) and a hole 4a communicating with the mixing chamber 4.
The valve body 7 has a distribution chamber 7a that allows the holes to communicate with each other. By operating the lever 8, as shown in Figures a to d in Figure 7,
Each hole 2a to 4a formed in the valve seat 6 is a distribution chamber 7.
The communication state is controlled by a, and the hot water is closed,
Obtain the following states: supplying only water, supplying only hot water, and supplying hot water. In the state shown in FIG. 7A, both the water chamber hole 2a and the hot water chamber hole 3a are closed, and both hot water and water are in a closed state. Also, in view b of the same figure, the hot water hole 3a
The mixing chamber hole 4a is in communication with the mixing chamber hole 4a, and only hot water is supplied from the water discharge pipe 9 communicating with the mixing chamber 4.
Further, in the state shown in Figure c of the figure, both the water chamber hole 2a and the hot water chamber hole 3a communicate with the mixing chamber hole 4a, and hot water mixed with hot water is supplied from the water discharge pipe 9. Furthermore, in the state shown in FIG. d of the figure, the water chamber hole 2a and the mixing chamber hole 4a are in communication, and only water is supplied from the water discharge pipe 9.

Therefore, in the case of such a hot water mixing faucet 1, the hot water and water supply passages 10 on the primary side of the on-off valve part,
Check valves 12 and 13 are arranged at 11 to prevent backflow of hot water and water. However, in the case where the check valves 12 and 13 are arranged, when only hot water is supplied as shown in Fig. 7b, the water chamber 2
The valve seat 6 and the valve body 7, and the check valve seat 12a and the check valve body 12 are connected through the partition wall of the bathtub 3 and the faucet body 1a, etc.
b, the water in the sealed water chamber 2 is warmed and expanded, and the pressure in the water chamber 2 becomes abnormally high. For this reason, the valve seat 6 and the valve body 7, which are made of ceramic, are pressed together more than necessary, resulting in poor slippage between the two and making it difficult to operate the lever 8. In addition, the faucet main body 1a becomes fatigued due to the repeated history of cooling and heating cycles due to repeated use.
This method had drawbacks such as the fact that the a was sometimes destroyed.

As a solution to this problem, there is a technology of a check valve 15 for a hot water mixing faucet, which is disclosed in Japanese Patent Application Laid-Open No. 59-58281 as shown in FIG. This check valve 15 has a valve body 18 attached to the outlet 17 side of a cylindrical case body 16, and the valve body 18 is normally biased to close the outlet 17 by a check valve spring 19. ing. Then, the case body 16 is urged toward the downstream side of the water passage 21 by a pressure absorbing spring 20, and is normally pressed against the locking step portion 22. In addition, hot water/water room 23
Valve bodies 26 and 27 for hot water and water are respectively disposed between 24 and the mixing chamber 25 to adjust the amount of hot water and water flowing into the mixing chamber 25. When only hot water is used and the pressure in the water chamber 23 increases, the case body 16 of the check valve 15 moves upstream (upward in FIG. 8) to increase the volume of the water chamber 2. , absorbs and relieves pressure rise.

[Problem that the invention attempts to solve]

However, in the hot water mixing faucet described in the above publication, when switching from a hot water only supply state to a hot water supply state and a water only supply state, the case body 16 is connected to the strong water supply pressure and the spring 20. This has the drawback that it is instantaneously urged downward in FIG. 8 due to the elastic return force of the faucet body 1a, and collides with the locking step 22 of the faucet body 1a, producing an impact sound. In addition, these collision parts may be damaged, and the device cannot withstand long-term use. Furthermore, the valve body 18
The case main body 16 functions as a sliding member, and since there are two sliding members, the number of causes of failure increases and the reliability of operation is not guaranteed. Furthermore, the flow path of this hot water mixing faucet is a flow path that passes through the cylindrical case body 16 in the axial direction. , it is necessary to provide a casing 28 (see Fig. 8) on which the valve body 18 for the backflow prevention function slides, and also to have a structure on which the case body 16 slides, resulting in a so-called double casing. As the diameter of the water passage 21 in the moving part increases, the number of parts increases, and the mixing faucet itself becomes larger and more complex.

[Purpose of invention]

The present invention improves and eliminates the above-mentioned drawbacks of the conventional technology, and aims to provide a check valve for a hot and cold water mixing faucet that has a simple structure and absorbs and alleviates the increase in pressure within the water chamber. .

[Means for solving problems]

The means of the present invention for solving the above problems are as follows:
A check valve disposed at least in the water supply passage of a hot/cold water mixing faucet in which a water chamber and a hot water chamber are provided in close proximity to each other, the check valve having a cylindrical case body and attached to one end side of the case body. A cap that closes this, an outflow port provided on the opening surface on the other end of the case body, an inflow port drilled on the circumferential surface of the case body, and a cap that is slidably fitted into the case body. a sliding surface portion of the valve body formed between the locking step and the outlet end by a locking step protruding from the inner wall surface of the case body; It consists of a check valve spring that urges the valve body toward the cap side of the case body, and a return spring that biases the valve body toward the outlet end side of the case body, and the return spring and the return spring bias the valve body toward the outlet end of the case body. A check valve for a hot and cold water mixing faucet, characterized in that the biasing force opposing the spring is set to position the valve body toward the outlet end side of the sliding surface part in a water-stop state. be.

[Effect]

As is clear from the embodiments shown in FIGS. 1 to 3,
Now, suppose that the hot and cold water mixing faucet 30 is continuously used to supply only hot water, and the pressure inside the water chamber 2 increases. The pressure in the water chamber 2 presses the valve body 35 to the right in FIGS. 1 and 3. The valve body 35 moves to the right in the figure against the return spring 46, increases the volume within the water chamber 2, and absorbs and alleviates the pressure increase within the water chamber 2.

The configuration of the present invention will be explained below based on the embodiments shown in the drawings. Note that the same reference numerals as in the conventional example shown in FIGS. 4 to 6 indicate the same members.

〔Example〕

FIG. 1 is a partial cross-sectional plan view of a hot water mixing faucet 30 to which a check valve 31 according to the present invention is applied, FIG. 2 is a side view of the check valve 31, and FIG. 3 is a longitudinal cross-section of the same check valve 31. FIG. As shown in the figure, the check valve 31
A cylindrical case body 3 is closed at one end by a cap 32 and has a supply water inlet 33 on the side.
4, and a valve body 35 mounted within the case body 34.
and the valve stem 36 form its main body. The open end side of the case body 34 is a supply water outlet 37.
A sliding surface portion 38 for the valve body 35 is formed on the inner wall surface of the case body on the side of the outlet 37. Further, a net member 39 functioning as a filter is attached to the outside of the inlet 33.

The valve body 35 is slidably fitted onto the sliding surface portion 38 via an O-ring 40, and in a water supply state described later, projects out of the outlet 37 in response to supply water pressure. Opens. The valve stem 36 is inserted through the rectifying member 41 in the middle thereof,
The middle portion thereof is slidably held by the rectifying member 41. Note that 42 is a locking step portion of the rectifying member 41 formed inside the case body, and 43 is a locking step portion 42.
This is a retaining ring for fixing the rectifying member 41 with. Further, a spring mounting member 44 is attached to the other end side of the valve shaft 36. 45 is a check valve spring mounted between the rectifying member 41 and the spring mounting member 44, and 46 is a return spring mounted between the spring mounting member 44 and the inner bottom 32a of the cap.

The biasing force of the check valve spring 45 and the return spring 46 is such that when the hot water mixing faucet 30 is in use and the water supply is cut off, the valve body 35 is closer to the opening end side of the sliding surface portion 38. (The state shown in Figure 3) is balanced. Note that the other configurations are the same as those of the conventional example shown in FIGS. 4 to 6.

In normal use, when water is being supplied, water supply pressure acts on the end surface 35a side of the valve body 35 through the water supply passage 10, and the valve body 35 is moved by the biasing force of the spring 45. 3 to the left side in FIG. 3 to open the outlet 37. Further, when the water supply is cut off, as described above, the valve body 35 is stopped in a state where it is fitted near the opening end of the sliding surface portion 38, thereby preventing backflow of the supplied water.

Therefore, if only hot water is used continuously, the fourth
The water in the water chamber 2, which is sealed by the ceramic valve seat 6 and valve body 7 shown in the figure, and the valve body 35 and sliding surface portion 38 of the check valve 31, is warmed and expands. The pressure inside begins to rise. The pressure within the water chamber 2 naturally acts on the end face 35b of the valve body 35, causing the valve body 35 to slide toward the right side in FIG. 3 against the biasing force of the return spring 46. Therefore, the volume within the water chamber 2 increases by the amount by which the valve body 35 slides, absorbing and alleviating the pressure increase. Therefore, it is possible to keep the pressure inside the water chamber 2 constant. As a result, the valve seat 6 and valve body 7 made of ceramic
The lever 8 is not pressed more than necessary, and the lever 8 can be operated smoothly. In addition, even if there is a history of repeated cooling/heating cycles, such as repeated use from a hot water only supply state to a hot water or water only supply state, or the reverse state, as described above, the water chamber 2 Since the pressure increase inside the faucet body 1a is absorbed and alleviated by the sliding movement of the valve body 35, the faucet main body 1a does not fatigue prematurely.

Therefore, when switching from a state in which only hot water is supplied to a state in which only hot water or water is supplied, the pressure within the water chamber 2 decreases. Therefore, the valve body 35 receives the water supply pressure, moves to the left in FIG. 3, leaves the fitted state with the sliding surface portion 38, and protrudes from the case body 34. That is, the outlet 37 is opened.

In addition, with this type of hot and cold mixed faucet, if the water supply is cut off from the state where water is being supplied, the water chamber 2
Water hammer occurs inside the tank, producing impact sounds, etc. In the hot water mixing faucet 30 of this embodiment, the valve body 35 can absorb and alleviate the pressure increase due to the force of water trapped in the water chamber 2.
It is also possible to eliminate the harmful effects of water hammer using the same behavior as in the case of absorbing and relaxing the pressure in the water chamber 2 when only hot water is used.

Note that the present invention is not limited to the above-described embodiments, and can be modified as appropriate. For example, the form of the hot water mixing faucet 30 and the installation position of the check valve 31 are arbitrary. It is also possible to apply it to other than single-lever type hot water mixing faucets.

[Effect of idea]

As explained above, in the present invention, when the pressure in the water chamber of the hot and cold water mixing faucet increases, the valve element of the check valve slides within the case body to increase the volume of the water chamber. The pressure increase is absorbed and alleviated. Therefore, the levers and the like do not become difficult to operate, and the faucet body does not become fatigued and prematurely destroyed due to the history of repeated cooling and heating cycles due to repeated use. The check valve also absorbs and mitigates water hammer. Furthermore, compared to the conventional check valve shown in Figs. 4 and 5, the check valve of the present invention only has an increased number of return springs, and moreover, the entire valve is assembled into the case body, making it a single unit. With a simple structure, the pressure increase in the water chamber and the adverse effects of water hammer can be absorbed and alleviated. Furthermore, in the conventional check valve shown in FIG. 8, when switching from a state in which only hot water is used to a state in which water or hot water is used, the valve body collides with other members and generates an impact sound. There are accidents that cause damage, etc.
With the present invention, such accidents do not occur at all.

[Brief explanation of the drawing]

Figures 1 to 3 are related to the present invention,
Fig. 1 is a partially sectional plan view of a hot water mixing faucet, Fig. 2 is a side view of the check valve, Fig. 3 is a longitudinal sectional side view of the same check valve, and Figs. 4 to 8 are related to the prior art. Accordingly, Fig. 4 is a vertical cross-sectional side view of the hot water mixing faucet, and Fig.
6 is a partially sectional front view of the same, FIG. 7 is a plan view showing the positional relationship between the two ceramic valve seats and the valve body in each usage mode of the hot water mixing faucet, and FIG. FIG. 8 is a partially sectional plan view showing another hot water mixing faucet. 2...Water chamber, 3...Water chamber, 10...Water supply passage, 31...Check valve, 33...Inflow port, 34...
Case body, 35... Valve body, 37... Outlet, 3
8...Sliding surface portion, 45...Check valve spring,
46... Spring for return.

Claims (1)

[Scope of utility model registration request] A check valve disposed at least in the water supply passage of a hot/cold water mixing faucet in which a water chamber and a hot water chamber are provided in close proximity to each other, the check valve having a cylindrical case body and attached to one end side of the case body. A cap that closes this, an outflow port provided on the opening surface on the other end of the case body, an inflow port drilled on the circumferential surface of the case body, and a cap that is slidably fitted into the case body. a sliding surface portion of the valve body formed between the locking step and the outlet end by a locking step protruding from the inner wall surface of the case body; It consists of a check valve spring that urges the valve body toward the cap side of the case body, and a return spring that biases the valve body toward the outlet end side of the case body, and the return spring and the return spring bias the valve body toward the outlet end of the case body. A check valve for a hot and cold water mixing faucet, characterized in that a biasing force opposing the spring is set so as to position the valve body toward the outlet end of the sliding surface portion in a water-stop state.