JPH0314622Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) This invention relates to a drain valve with a check valve.

(Prior Art) A faucet device is usually provided with a check valve to prevent backflow of water or hot water (hereinafter simply referred to as water) sent from a water or hot water supply source.

Furthermore, in cold regions, a drain valve is provided to drain the water in order to prevent the water in the faucet body from freezing and damaging the faucet device. FIG. 2 shows an example of these check valves and drain valves provided in a hot water mixing faucet as a water faucet. In the figure, 100 is the main body of the faucet, and 102 is its leg. Further, 104 is a drain valve arranged at the base of the leg 102,
Reference numeral 106 designates a check valve disposed at a connection portion of the main body 100 to the leg 102.

As shown in FIG. 3, the check valve 106 includes a main body case 112 consisting of two cylindrical bodies 108 and 110;
A valve seat 114 formed at one end of the main body case 112
, a valve 116 that is seated on or separated from the valve seat 114 , a guide bush 120 that fits onto the shaft 118 of the valve 116 and guides its movement, and the valve 116 .
16 in the closing direction. The water (or hot water) sent inside the leg 102 flows through the inlet 124 into the main body case 11.
At the same time, the water enters the interior of the faucet body 100, pushes up the valve element 116, flows out through the opening at one end of the body case 112, and flows into the interior of the faucet body 100.

This check valve 106 has a push rod 126 as an operating member that is slidable into a through hole of the main body case 112 and is liquid-tightly fitted via a U gasket.By pushing this push rod 126, The valve element 116 is forcibly pushed in the opening direction.

On the other hand, the drain plug 104 has a plug body 130 screwed into a cylindrical portion 128 that protrudes twice from the leg 102,
When the stopper 130 is rotated and loosened, the leg 10
2 and the flow path inside the cylindrical part 128, as well as the plug body 130.
The channels formed in the two channels communicate with each other. To drain water from the drain valve 104, first push the push rod 126 of the check valve 106 into the valve valve 104.
16 forcibly open, and in that state, drain valve 104
This is done by rotating the stopper 130 in the opening direction. When the stopper 130 is rotated, the leg 10
2, the flow path in the cylindrical portion 128 and the flow path in the plug body 130 are in communication with each other, and the check valve 106
When the valve 116 opens, the faucet main body 100 opens.
The inside is also in communication with the inside of the leg 102, so that water inside the faucet body 100 is discharged to the outside through the flow path inside the leg 102 and the cylindrical portion 128, and further through the flow path of the stopper body 130.

(Problems to be Solved by the Invention) As described above, in conventional faucet devices, a check valve and a drain valve are usually provided separately. However, if these check valves and drain plugs are provided separately, not only will the number of parts increase, but the assembly will be troublesome, and when draining water, both must be operated together, making the operation itself troublesome.

(Means for solving the problem) The drain valve with a check valve of the present invention was devised to solve the above problem, and its gist is as follows: (a) main body case; (b) an inlet provided in the main body case that allows water from the water supply source to flow into the main case; and (c) an inlet that allows water led into the main case to flow out to the faucet spout side. (d) a valve seat as a valve element, a valve element, and a spring member for biasing the valve element in a closing direction, and provided at any part of the flow path from the inlet to the outlet;
(e) a one-way check valve that opens the valve to allow water to flow in the forward direction, and closes the valve to block the flow path in the reverse direction; The check valve is mounted so as to be removable in and out of the main body case and is opposed to the valve element of the check valve, and the valve element is forcibly moved in the opening direction against the biasing force of the spring member by pushing into the main body case. The present invention includes: a plug that is pushed and, when operated, opens a drainage passage to allow water in the flow passage to flow out to the outside.

(Function) In this way, in the device of the present invention, the check valve and the drain valve are built into the same shell (specifically, the main body case), and the drain valve has the same structure as the check valve. As a result, the number of required parts is reduced compared to conventional ones. That is, according to the present invention, the check valve itself has a water draining function, eliminating the need for a separate drain plug, and at the same time, the water draining operation becomes simple. With conventional faucets, the push rod of the check valve and the stopper of the drain valve had to be operated in separate parts, but with the present invention, the push rod of the check valve and the stopper of the drain valve can be operated simply by pushing the stopper. It gets better.

(Example) Next, an example of the present invention will be described in detail based on the drawings. In FIG. 1, 10 is the first cylindrical body 1
2 and a second cylindrical body 14 screwed into the main body case, an inlet 16 for introducing water into the body is formed. One end of the main body case 10 is an open end, and the main body case 10
The water that has flowed into the interior is allowed to flow out from this open end toward the faucet body. A valve seat 18 is provided at this opening end, and a valve element 20 is seated on or separated from the valve seat 18. The valve element 20 is equipped with a shaft portion 22, and this shaft portion 22 is connected to a guide bush 2 fixed to the main body case 10.
4 is slidably fitted. A seat plate 26 is fixed to the tip of the shaft portion 22, and one end of a spring 28 is brought into contact with the seat plate 26.
8, the direction in which the valve element 20 is seated on the valve seat 18;
That is, it is biased in the closing direction.

On the other hand, a female screw hole 30 is formed in the center of the other end of the main body case 10, and a hollow shaft-shaped plug 32 is screwed into the hole through a male screw 34 formed on the outer circumferential surface of the hole so as to be removable and removable. . The hollow portion of the plug body 32 serves as a water drainage passage 36, and is communicated with the inside of the main body case 10 through a radial through hole 38. A flange 4 is attached to one end of the plug body 32 (the end on the inside of the main body case 10).
0 is formed, and an O-ring 42 as a sealing material is attached thereto, and when the plug body 32 is tightened, this O-ring 42 contacts the valve seat 44 of the main body case 10.
The drain passage 36 and the inside of the main body case 10 are cut off from communicating with each other. A bottomed cylindrical operating member 46 is fixed to the other end of the stopper 32, and a rotational operating force can be applied thereto.

On the other hand, a wire 48 bent in a V-shape is provided in the hollow interior of the stopper 32 (water drain passage 36), and water is guided by the wire 48. This wire 48 is locked in the through hole 38 of the plug body 32 at the bent hook portions at both ends. In addition, 50 is a strainer.

Next, the function of this drain valve will be explained.

Figure 1 shows the state where the drain valve is closed, that is, the valve body 32.
This shows the state in which the check valve is in the closed position, and in this state, the check valve is in a free state and performs normal operation. That is, when water is sent through the inside of the leg, the valve 20 is opened to the left in the figure by the flow, allowing water to flow toward the faucet body, and vice versa. When water tries to flow to the side, Benko 2
0 closes to prevent this.

On the other hand, when the valve body 32 is rotated and inserted into the main body case 10 in order to drain the water inside the faucet body to prevent freezing, the valve 20 is moved by the spring 28.
The check valve is pushed to the left in the figure against the urging force of the check valve, opening the check valve. At the same time, the drain passage 36 inside the stopper 32 is in communication with the inside of the main body case 10, and the water inside is discharged to the outside through the drain passage 36. At this time, the wire 48 installed inside the water drainage passage 36 forms a water path to encourage water to flow out.

After draining the water in this way, operate the stopper 32 again to return it to its original state. Then, the drain passage 36 is shut off, and at the same time, the check valve is opened and resumes normal operation.

The drain valve of this example is the conventional check valve 106 shown above.
As can be seen by comparing it with (Figs. 2 and 3), its configuration has hardly changed. Conventional push rod 126
is merely replaced by the stopper body 32 of the drain stopper. Therefore, the number of parts is almost the same as that of conventional check valves, and it has excellent advantages that conventional check valves do not have, such as having a water drainage function and being able to be operated with one touch.

This drain valve with check valve has the following features in addition.

First, unlike conventional check valves, the operating member (stopper body 32) that pushes the valve element to the open position is not automatically returned. In the conventional check valve 106 shown in FIG. 3, even if the push rod 126 is pushed to open the valve 116, the push rod 116 may be pushed back over time and the drain valve may no longer function. In the drain valve of this example,
The plug body 32 once screwed in will not be automatically returned, and the drain plug will work reliably.

Second, in the conventional check valve 106, water adhering to the outer sliding surface of the push rod 126 and the inner surface of the through hole of the main body case 112 freezes and fixes the push rod 126, and when the push rod 126 is operated next. However, in this example, the stopper 32 is screwed in and can be opened and closed reliably.

Thirdly, in the conventional device, scale and the like may accumulate on the sliding surface of the push rod 126, making it difficult to operate the push rod 126, and making it difficult to return the push rod 126 to its original position. If this push rod 126 remains in contact with the valve element 116 of the check valve and does not return, the check valve will not function properly. If the check valve does not work, the water inside the faucet may flow into the water supply or hot water supply pipes, or if the shower head is submerged in the bathtub, the water in the bathtub may flow into the pipes or into the hot water tank. It causes a condition where it flows into the lower part.

On the other hand, in the device of this example, the plug body 32
Since it is possible to reliably return it to its original position, there is no risk of such problems occurring.

Fourthly, the reason why such a problem occurs in the conventional device is that the faucet can be used even if the push rod 126 is not fully returned, and there is no visible abnormality in appearance. In the device of this example, if the stopper 32 is not returned sufficiently, water will leak from the drain passage 36, making it impossible to use the faucet normally, and in addition, it is obvious that there is an abnormality in the device. If the faucet is used with the faucet 32 forgotten to be returned, there is no risk of a backflow phenomenon occurring due to non-operation of the check valve.

Fifth, the device of this example can smoothly discharge the water inside the main body case 10 by the water guiding action of the wire 48, and the attached water is left inside the main body case 10, and the operation is based on the freezing of this attached water. Does not cause defects. Incidentally, the wire 48 can also be used for cleaning the drain passage 36.

Although the embodiments of the present invention have been described in detail above, the present invention can also be configured in other forms.

For example, in this example, screws are used to hold the stopper 32 in the open and closed positions, but it is also possible to do this using other holding means. Furthermore, the object of the present invention can be achieved to a certain extent even if such a holding means is not provided and the stopper is locked only in the closed position.

In addition, in the above example, the drain passage is provided in the stopper itself, but it is also possible to provide the drain passage on the side of the main body case, or to straddle both. The present invention can be constructed with various modifications without departing from the spirit thereof, such as the possibility of providing a chain or other water guiding body.

(Effects of the invention) As described above, according to the invention, there is no need to separately provide a check valve and a drain valve, which simplifies the structure of the faucet device, and at the same time, the water drain operation is also simplified, which is an excellent feature. effect occurs.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a water drain faucet with a check valve, which is an embodiment of the present invention, and Fig. 2 is a partial view showing a conventional check valve and water drain faucet in a state of being incorporated into a water faucet device. FIG. 3 is a cutaway plan view, and FIG. 3 is a sectional view of the check valve in FIG. 2. 10...Main case, 16...Inflow port, 18...
... Valve seat, 20 ... Valve element, 28 ... Spring member, 30
...Female thread, 32...Plug body, 34...Male thread, 3
6... Drainage passage, 48... Wire.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) (A) A main body case, (B) An inlet provided in the main body case that allows water from a water supply source to flow into the main body case, and (C) The main body. An outflow port that allows water guided into the case to flow out to the spout side of the faucet, and (d) a valve seat as a valve element, a valve element, and a spring member that biases the valve element in the closing direction. A valve is provided at any part of the flow path from the inlet to the outlet, and opens a valve to allow water to flow in the forward direction, and closes the valve in the opposite direction. (e) A one-way check valve that is installed in the main body case so as to be removable and facing the valve element of the check valve, and that is inserted into the main body case to open the check valve. a stopper that forcibly pushes the valve in the opening direction against the biasing force of the spring member, and opens a drainage passage when operated to cause the water in the flow passage to flow out to the outside; A drain valve with a check valve. (2) A utility model that is provided with holding means for holding the stopper in an open position in which the valve is opened and the drain passage is opened, and in a closed position in which it is separated from the valve and closes the drain passage. A drain valve with a check valve according to claim 1. (3) Utility model registration in which the holding means is a female thread formed on the inner surface of the through-hole of the main body case through which the plug is inserted, and a male thread formed on the outer peripheral surface of the plug and screwed into the female thread. A drain valve with a check valve according to claim 2. (4) The plug body is a hollow shaft-shaped member, the hollow part is the water drainage passage, and the water drainage passage includes:
Utility model registration claims 1 to 3, which are equipped with a linear water conductor for guiding water discharge
A drain valve with a check valve as described in any of the paragraphs.