JPH0328213Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a check valve for preventing a backflow phenomenon in a flow path in a hot water mixing faucet or the like.

[Conventional technology]

Conventionally, in devices such as hot and cold mixer faucets that have two piping systems, one on the water supply side and one on the hot water supply side, check valves are installed to prevent hot water from flowing into the water supply side and water from flowing into the hot water supply side. It is common practice to provide

As shown in Fig. 2, this check valve consists of a primary flow path F-1, which is a flow path on the water supply or hot water supply side, and a secondary flow path, which is a flow path on the discharge pipe side, in the hot water mixer faucet body 1. F
Generally, a cylindrical check valve main body 2 is fixed between the check valve main body 2 and the hot water mixing faucet main body 1, and can be inserted into and removed from the hot water mixing faucet main body 1 by means of a removable blind bushing 30.

This check valve main body 2 has a valve seat 3 on the side of the secondary flow path F-2, a valve body 4 that approaches and separates from this valve seat 3 is fixed to a valve shaft 5, and further this valve shaft 5 is closed. A spring 6 is disposed to bias the check valve in the direction of the valve, and guide vanes 7 are provided to guide movement of the valve body 4 and valve stem 5 relative to the check valve body 2.

In such a check valve structure, when the pressure in the secondary flow path F-2 decreases due to water discharging operation, the valve body 4 is moved by the spring 6 due to the water pressure in the primary flow path F-1. It moves away from the valve seat 3 against the force, and water or hot water can be supplied into the hot water mixing faucet body 1. Also,
When water discharging is stopped, the primary and secondary flow paths F-1 and F-
The pressure inside 2 reaches an equilibrium state, and the valve body 4 is moved toward the valve seat 3 by the spring 6 to close the valve, and hot water or hot water flows from the secondary flow path F-2 to the primary flow path F-1. Can prevent backflow of water.

[Problem that the invention attempts to solve]

By the way, in order to prevent the internal flow path from freezing, hot and cold mixer taps that are designed for cold regions are usually equipped with a drain valve, and by opening this drain valve, all the water in the internal flow path can be drained. This prevents freezing accidents at night.

However, when there is something small and relatively complex in structure, such as a check valve, a water film is generated between the components due to phenomena such as surface tension, which can lead to freezing. It may cause a connection. In particular, in the case of the conventional example, the primary flow path F-1
This phenomenon often occurs in the portion of the guide vane 7 located inside.

The check valve part, which is prone to such freezing accidents, does not have a dedicated water drain mechanism, so even if you open the drain valve installed in the hot water mixer faucet, water will remain, causing the check valve to freeze. There is a problem that it becomes impossible to perform its function.

The present invention was devised in order to prevent freezing in the check valve as described above, and its purpose is to promptly drain water from the check valve portion and reliably prevent freezing accidents.

[Means and actions for solving problems]

The present invention is incorporated into a main body of a faucet from the outside through an internal primary passage, and has a seating surface for a valve body in a secondary passage within the body of the faucet; The check valve has a check valve body equipped with a spring biased in the valve closing direction, the check valve body being operable from outside the body of the faucet to open the valve body. Incorporates a spindle that pushes the
A built-in structure is provided between the spindle and the check valve body, which allows communication between the outside of the faucet body and the primary flow path when the spindle opens the valve body. Features.

When the spindle is operated to push the valve body, the valve body separates from the valve seat in the secondary flow path in the main body of the faucet, and the primary flow path and the secondary flow path communicate with each other. Therefore, even if a drain plug is provided in the secondary flow path, water in the primary flow path also flows to the secondary flow path and is discharged. Also, when the spindle pushes the valve body and opens the flow path,
The primary flow path is opened to the outside air, and the water is quickly discharged due to the inflow of air.

〔Example〕

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

FIG. 1 is a partially cutaway plan view of a hot water mixing faucet equipped with a check valve according to the present invention, and the numbers assigned to the check valve elements are the same as those described in the conventional example.

Reference numeral 10 denotes a check valve fitting detachably arranged on the back of the hot water mixing faucet main body 1, and the check valve main body 2 integrally screwed thereto is connected to the primary flow path F-1 of the hot water mixing faucet main body 1. and a partition wall 1 that partitions the secondary flow path F-2.
A gasket 13 is arranged and fixed to the mounting seat 12 of 1.

The check valve fitting 10 has a female screw 14 that is screwed into the check valve main body 2 and a hole 15 that is coaxially opened therewith. Patsukin 17 is placed in.

As shown in the figure, the outer diameter of the peripheral surface of the spindle 16 is slightly smaller than the inner diameter of the hole 15 at a portion above the packing 17. For this reason, the spindle 16
When the gasket 17 moves away from the hole 15 and the seal is broken, the part of the spindle 16 with a smaller outer diameter is located inside the hole 15, and the gap between the hole 15 and the outer circumferential surface of the spindle 16 is increased. This allows the primary flow path F-1 to communicate with the outside.

In the check valve main body 2, a valve seat 3 is provided in the secondary flow path F-2 as in the conventional example, and a valve body 4 that approaches and separates from the valve seat 3 is connected to one end of the valve shaft 5 biased by a spring 6. death,
Furthermore, guide vanes 7 are provided for guiding movement within the check valve main body 2.

Furthermore, 20 is a drain valve rotatably provided on the front surface of the hot water mixing faucet main body 1 on the secondary side flow path F-2 side,
An auxiliary screw 21 for preventing falling off is formed at the distal end, and a packing 23 and a mounting screw 24 are provided at the proximal end on the side of the knob 22.

The check valve elements are provided on both the water side and hot water side supply systems, and the hot water and water are mixed and discharged from the water discharge pipe 31.

In the above configuration, in order to drain water from the internal flow path, the spindle 16 is opened at the same time as the drain plug 20 is opened.
is moved in the direction of the valve shaft 5, and the seal 17 and hole 15 are
This movement of the spindle 16 presses the valve stem 5 to separate the valve body 4 from the valve seat 3 and open the check valve.

By the above operation, the primary flow path F-1 and the secondary flow path F-2 are communicated with each other, and the seal on the spindle 16 side is broken, so the hole 15 portion functions as an air hole, and the Internal water can be quickly drained from the drain plug 20.

Furthermore, by moving the spindle 16 toward the valve shaft 5 side, the volume of the portion housing the check valve element is reduced, and the water inside is forced to the drain plug 20 side by the operation of the spindle 16. The amount of water droplets remaining in the check valve portion can also be reduced due to the reduced volume.

Therefore, the primary flow path F-1 and the secondary flow path F-
Since the remaining water in step 2 can be simultaneously discharged and the water film that tends to form on the guide vanes 7 can be completely removed, freezing can be reliably prevented.

[Effect of idea]

This invention allows water in the primary and secondary channels to be simultaneously discharged from the drain valve by opening the valve through external operation, and also temporarily saves space for housing the check valve element. By reducing the size, the amount of residual water droplets can be reduced, which has the effect of reliably preventing the check valve from freezing.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view of a check valve according to the present invention disposed in a hot water mixing faucet, and FIG. 2 is a sectional view of a conventional example. 1...Hot water mixing faucet body, 2...Check valve body, 3
... Valve seat, 4 ... Valve body, 5 ... Valve stem, 6 ... Spring, 7 ... Guide vane, 10 ... Check valve fitting, 11 ... Partition wall, 12 ... Mounting seat, 14 ... …
Female screw, 15...hole, 16...spindle, 17
...Packing, 20...Drain plug, F-1...Primary side flow path, F-2...Secondary side flow path.

Claims (1)

[Claims for Utility Model Registration] Built into a main body of a faucet from the outside through an internal primary flow path, and having a seating surface for a valve body in a secondary flow path within the main body of the faucet; A check valve having a check valve main body equipped with a spring that biases the valve body in a valve closing direction, the check valve main body being operable from the outside of the main body of the faucet, and the valve body being operable from the outside of the main body of the faucet. A spindle is installed between the spindle and the check valve body to push the check valve body in the valve opening direction, and the spindle connects the outside of the faucet body and the primary flow path when the valve body opens. A check valve characterized by having a built-in structure that allows communication between the two.