JP2539185Y2 - Structure for preventing abnormal rise of internal pressure in hot and cold water mixing faucet - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a structure for preventing an abnormal increase in internal pressure in a hot and cold water mixing faucet for mixing hot water and water supplied separately.

[0002]

2. Description of the Related Art Conventionally, a hot and cold water mixing faucet 1 is shown in FIGS.
As shown in the figure, a cold water inflow passage 2, a hot water inflow passage 3, a mixed water outflow passage 4, and a valve chamber 5 are formed in the faucet main body 1a. In the valve chamber 5, a set of two fixed plates 6 and a movable plate 7 made of ceramics are arranged in a watertight and slidable manner. The fixing plate 6 includes a water inlet 6a communicating with the cold water inflow passage 2 and a hot water inlet 6b communicating with the hot water inflow passage 3.
A mixed water outlet 6c communicating with the mixed water outflow passage 4 is formed. The movable plate 7 has, on its sliding surface, a distribution channel 7a that connects the water inlet 6a, the hot water inlet 6b, and the mixed water outlet 6c of the fixed plate 6. In the hot and cold water mixing faucet 1, the movable plate 7 is moved by swinging the lever 8 up and down and left and right to switch between water discharge and water stoppage and adjust the mixing ratio of hot water and water.

In the hot and cold water mixing faucet 1, check valves 12 and 13 are arranged between the cold water inflow passage 2 and the water supply passage 10 and between the hot water inflow passage 3 and the hot water supply passage 11, respectively. ,
It prevents water and hot water from flowing back.

In the case where the check valves 12 and 13 are disposed, when only hot water is supplied, the hot water is cooled by the cold water through the partition 16 of the cold water inflow passage 2 and the hot water inflow passage 3 and the faucet body 1a. Heat is transferred into the inflow passage 2. However, since the cold water inflow passage 2 in which only hot water is supplied is sealed by the movable plate 7 and the check valve 12, the internal water is heated and expanded, and the internal pressure becomes abnormally high. . In addition, when the temperature of the faucet installation environment rises in the shut-off state, the internal pressure of the hot-water mixing faucet 1 becomes abnormal due to the expansion of the water in the closed cold water inflow passage 2 and the hot water inflow passage 3. May be higher.

[0005] For this reason, in the hot and cold water mixing faucet 1, the fixed plate 6 and the movable plate 7 are pressed more than necessary due to the abnormally high internal pressure, the sliding between them becomes poor, and the operation of the lever 8 becomes heavy. May be. Further, the hot and cold mixing faucet 1 may leak from the seal portion due to an abnormally high internal pressure, or the faucet main body 1a may be broken by fatigue due to repetition of a cooling / heating cycle.

Therefore, as shown in FIG. 6, there is a structure for preventing an abnormal increase in the internal pressure of the hot and cold water mixing faucet 1 as shown in FIG. This prevention structure includes a primary side passage 20 communicating with the water supply passage 10 or the hot water supply passage 11 and a secondary side passage 21 communicating with the cold water inflow passage 2 or the hot water inflow passage 3 of the hot and cold water mixing faucet 1.
A valve case 14 having a communication path 14a formed therein, and the cylindrical body 1 fitted in the communication path 14a in a watertight and slidable manner.
5 and seated in the valve seat 16 formed in the cylindrical body 15 and seated in the cylindrical body 15 to move from the secondary side passage 21 to the primary side passage 20.
A check valve body 17 for preventing backflow to the valve, a check valve spring 18 disposed between the cylindrical body 15 and the check valve body 17 and pressing the check valve body 17 in a seating direction; A cylinder spring 19 is disposed between the valve case 15 and the valve case 14 and presses the cylinder 15 toward the secondary passage 21. This preventive structure is such that when the pressure in the secondary passage 21 rises,
Is moved downward in the figure to increase the volume on the secondary side passage 21 side, so that the pressure increase of the cold water inflow passage 2 or the hot water inflow passage 3 of the hot and cold water mixing faucet 1 communicating with the secondary side passage 21 is reduced. Suppress.

[0007]

However, when the cylinder 15 moves toward the primary passage 21 due to a rise in the pressure in the secondary passage 21, the prevention structure prevents the cylindrical spring 19 from being compressed. The elastic repulsion also increases gradually. Therefore, the prevention structure cannot fundamentally solve various problems such as a small amount of suppression of the pressure rise in the secondary side passage 21 and heavy operation of the lever 8.

The present invention provides a structure for preventing an abnormal increase in internal pressure in a hot and cold water mixing faucet, in which the internal pressure of a secondary passage is not increased to a predetermined pressure or more in order to fundamentally solve the problem. Aim.

[0009]

The gist of the structure for preventing an abnormal increase in internal pressure in the hot and cold water mixing faucet according to the present invention (hereinafter referred to as "the present invention structure") is that the primary passage and the secondary passage of the hot and cold water mixing faucet. A valve case having a communication path for communicating with the valve body, a cylinder slidably fitted in the communication path, and a secondary side seated in the cylinder body and seated on a valve seat formed in the cylinder body. A check valve for preventing backflow from the passage to the primary side passage, a check valve spring disposed between the cylindrical body and the check valve, and pressing the check valve in a seating direction ; Formed in the valve case
A valve body of a relief valve provided on the cylinder so as to be seated on a valve seat
And a cylinder spring disposed between the cylinder and the valve case to press the cylinder in a seating direction toward the secondary side passage . The cylinder has a spring against the elasticity of the cylinder spring. body
Moves toward the primary passage and opens the relief valve.
Primary and secondary passages between the valve case and the cylinder
In abnormal increase prevention structure of the internal pressure in the mixing valve to release path communicating are formed bets, secondary of the cylindrical body
A flange is formed on the side passage side, and
The spring for the cylindrical body is externally fitted to the cylindrical body, and
That is, a valve body of the relief valve is provided on the secondary passage side . A concave groove is formed in the end surface of the cylindrical body on the side of the secondary passage.
The elastic groove forming the valve body of the relief valve is formed in the concave groove.
May be fitted.

[0010]

The operation of the present invention will be described with reference to the embodiment shown in FIGS. When the internal pressure of the secondary side passage 41 increases, the cylinder 35 moves toward the primary side passage 40 against the repulsive elastic force of the cylinder spring 39, and moves the valve body 32a.
Release the relief valve 32 away from the valve seat 32b (see FIG. 2)
I do. The high-pressure water in the secondary passage 41 passes through the relief valve 32 and the relief passage 33 in the open state, and flows out to the primary passage 40. When the pressure in the secondary side passage 41 decreases due to the outflow of the high-pressure water, the cylindrical body 35
Pushed back by the resilience force, the valve body on the valve seat 32 b 32
a is pressed to close the relief valve 32 (see FIG. 1). Tube
The repulsive elastic force of the body spring 39 is applied to the flange 35 of the cylindrical body 35.
d to the valve body 32a, the relief valve 32
The valve body 32a slides smoothly without swinging. For cylinder
The space for storing the spring 39 is changed to the space for storing the cylindrical body 35.
Can also be used as

The end surface 35e of the cylindrical body 35 on the side of the secondary passage 41.
By forming the valve body 32a of the relief valve 32, the amount of movement of the cylinder 35 required to open the relief valve 32 can be made very small. Therefore, the differential pressure between the internal pressure of the secondary passage 41 when the relief valve 32 is opened and the internal pressure when the relief valve 32 is closed can be made extremely small. Therefore, the secondary side passage 4
The internal pressure of No. 1 does not rise abnormally. Of the cylindrical body 35
The groove 35c formed in the end face 35e on the secondary passage side has elasticity.
The valve body 32a of the relief valve 32 is formed by fitting the ring 42.
When performing the maintenance, the elastic ring 42 is hard to fall off,
When the cylinder 35 is removed, the elastic rig 42 is removed at the same time.
Can be

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below with reference to an embodiment shown in the drawings. First Embodiment FIGS. 1 and 2 show a first embodiment of the present invention. This embodiment is used for a hot water mixing faucet (see FIG. 5) which is installed on a table. An improvement in the present embodiment is that a relief valve 32 is formed between the valve case 34 and the cylinder 35 and the primary side passage 40 and the secondary side passage 41 are opened while the relief valve 32 is opened (see FIG. 2). The relief passage 33 is formed to communicate with. Other than this improvement,
This is substantially the same as the conventional prevention structure shown in FIG.

The primary side passage 40 is connected to the water supply passage 10 or
Communicates with the hot water supply passage 11. In addition, the secondary passage 41
Is the cold water inflow passage 2 of the hot water mixing faucet (see FIG. 5) or hot water
Connect to inflow passage 3. The relief valve 32 includes a valve body 32.
a and a valve seat 32b. The valve body 32a is
Of the secondary passage 41End face35eGroove recessed in35c
And an elastic ring 42 is fitted thereto. Valve seat 32
b is a step portion 34 formed in a communication path 34 a of the valve case 34.
b of the flat surface 34c. The relief valve 32 is a cylinder 35
Spring 39 disposed between the valve case 34 and the valve case 34
It is designed to be normally closed by the rebound resilience.

The cylindrical body 35 is provided on the secondary side passage 41 side.
A flange 35d is formed so that it comes into contact with the flange 35d.
The spring 39 for the cylindrical body is fitted to the outside, and the
A valve body 32a of the relief valve 32 is provided on the side of the secondary passage 41.
You. The cylinder spring 39 is composed of the cylinder 35 and the valve case 34.
To move the cylinder 35 toward the secondary side passage 41.
The seat is pressed in the seating direction.

When the internal pressure of the secondary passage 41 rises, the relief valve 32 moves the cylindrical body 35 to the cylindrical spring 39.
The valve opens when it moves toward the primary side passage 40 against the repulsive resilience of. The rebound resilience of the cylinder spring 39 is determined by the pressure difference ΔP between the internal pressure of the secondary passage 41 and the internal pressure of the primary passage 40 when the relief valve 32 is opened. Is determined so as to be a value that does not increase the weight of the operation (for example, ΔP = 3 to 5 kg / cm ² ).

[0016] Incidentally, relief valve 32, although not shown, as well as fitting the elastic ring 42 on the flat surface 34c of the valve casing 34, form <br/> formed by the end surface 35e of the cylindrical body 35 on the flat surface It is also possible.

The relief passage 33 is provided with a cylindrical body 35 (FIG. 1).
(See (B))), the cutting surfaces 35b, 35b
, And the outer peripheral surface 35a of the cylindrical body 35 and the valve case 34
Is formed between the inner peripheral surface 34d and the inner peripheral surface 34d.

The valve case 34 has a communication path 34a for connecting the primary side passage 40 and the secondary side passage 41 of the hot and cold water mixing faucet.
And a cylindrical body 35 is slidably fitted into the communication path 34a. A check valve 43 housed in the cylinder 35 and seated on a valve seat 36 formed in the cylinder 35 to prevent a backflow from the secondary passage 41 to the primary passage 40; The check valve body 37 is disposed between the cylinder 35 and the check valve body 37.
And a check valve spring 38 for pressing the spring in the seating direction. The operation of the structure of the present invention is as described in the above operation.

(Second Embodiment) FIG. 3 shows a second embodiment of the structure of the present invention. The present embodiment is used for a hot and cold water mixing faucet 51 of a type attached to a wall W. The structure of the present invention is constituted by a valve case 54 projecting from the faucet main body 51a. The valve case 54 is
The mounting leg 64 with a water stopcock is connected. In this embodiment, a relief valve 52 is formed between the valve case 54 and the cylinder 55, and the primary side passage 60 and the secondary side passage 61 communicate with each other while the relief valve 52 is open (not shown). Escape passage 53
Is formed.

The valve case 54 forms a communication path 54a for connecting the primary side passage 60 and the secondary side passage 61 of the hot and cold water mixing faucet, and the cylinder 55 is slidably fitted in the communication path 54a. It is. The check valve 63 is housed in the cylinder 55,
A check valve body 57 which is seated on a valve seat 56 formed at the bottom and prevents backflow from the secondary side passage 61 to the primary side passage 60;
5 and a check valve spring 58 for pressing the check valve 57 in the seating direction.
The resilience of the cylinder spring 59 is determined in the same manner as in the first embodiment. In the figure, reference numeral 65 denotes a C-ring.

[0021]

[Effect of the invention] As described in detail above, the structure of the invention isAs follows
Has a practical effect.  A small amount of cylinder movement required to open the relief valve
The internal pressure of the secondary passage may rise abnormally.
Disappears. As a result, the operation of the lever is
Light, no water leakage from the seal,
A hot and cold mixing faucet that does not cause fatigue failure of the faucet body due to repetition
Can provideYou.

The rebound resilience of the cylinder spring is cylindrical.
To the valve body through the collar of the relief valve
Sliding smoothly without swinging. As a result,
Is stable when the relief valve is closed,
The release valve can be completely normally closed.

The storage space for the cylinder spring is
Can also be used as a body storage space. As a result,
Can make the whole compact.

The cylindrical body is recessed at the end face on the secondary passage side.
Fit the elastic ring into the groove to form the valve body of the relief valve
Sometimes, the elastic ring is difficult to fall off,
By removing the elastic rig, the elastic rig can be removed simultaneously.
As a result, the structure of the present invention can be easily maintained .

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the structure of the present invention,
(A) is a longitudinal sectional view of the relief valve in a closed state, and (B) is a
It is a cross-sectional view in the A line.

FIG. 2 is a longitudinal sectional view showing a state in which a relief valve of the embodiment is closed.

FIG. 3 is a plan view showing a second embodiment of the present invention, in which a main part is sectioned.

FIG. 4 is a right side view showing a conventional hot and cold water mixing faucet, in which a main part is sectioned.

FIG. 5 is a front view in which a main part of the hot and cold water mixing faucet is sectioned.

FIG. 6 is a longitudinal sectional view showing a structure for preventing an abnormal increase in internal pressure in a conventional hot and cold water mixing faucet.

[Explanation of symbols]

32 (52) relief valve 33 (53) relief passage 34 (54) valve case 35 (55) cylinder
36 (56): Valve seat 37 (57): Check valve
38 (58) ... check valve spring 39 (59) ...
Spring 40 (60) for cylindrical body: primary passage 41
(61)… Secondary side passage

Claims (2)

(57) [Scope of request for utility model registration] 1. A valve case having a communication passage connecting a primary passage and a secondary passage of a hot and cold water mixing faucet, a cylinder slidably fitted in the communication passage, and a cylinder body Is housed in a check valve that seats on a valve seat formed in the cylinder to prevent backflow from the secondary passage to the primary passage, and is disposed between the cylinder and the check valve, The check valve spring that presses the check valve body in the seating direction and the valve seat formed on the valve case
A valve body of a relief valve provided on the cylinder so as to be seated, and a cylinder spring disposed between the cylinder and the valve case and pressing the cylinder in a seating direction toward the secondary side passage. The cylinder body is provided with one against the elasticity of the cylinder spring.
When the relief valve is opened by moving toward the secondary passage,
A primary passage and a secondary passage are provided between the valve case and the cylinder.
In the structure for preventing an abnormal rise in internal pressure in a hot and cold water mixing faucet in which a communicating escape passage is formed, a secondary side passage of the cylindrical body is provided.
A flange portion is formed on the road side, and the cylinder is contacted with the flange portion.
A body spring is fitted over the cylindrical body, and the secondary
A valve body of the relief valve is provided on a side passage side.
Prevention of abnormal rise of internal pressure in hot water mixing faucet. 2. A groove is formed in an end face of the cylindrical body on the side of the secondary passage.
The elasticity that is recessed and forms the valve body of the relief valve in this groove
The hot and cold water mixing faucet according to claim 1, wherein a ring is fitted.
Structure to prevent the internal pressure from rising abnormally.