JPS5842692Y2 - Water pressure responsive gas valve - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a water pressure responsive gas valve used in a stop-start water heater or the like.

The outline of this type of hydraulically responsive gas valve will be explained using a part of the drawings of the embodiments of the present invention.A main body 1 constituting a water circuit and an upper main body 7 constituting a gas circuit are screwed together inseparably. The cavity formed by the main body 1 and the upper body 7 is divided by a diaphragm 6 into a cavity 3 and a cavity 8, and the diaphragm 6 responds depending on the presence or absence of flow in the water circuit 5. opens and closes the valve element 16 in the gas circuit 15 which is interlocked with this.

In the above conventional system, when the water circuit freezes in winter, the hydraulically responsive gas valve is damaged first compared to other piping parts.

This is because this water pressure responsive gas valve has a joint (screwed part) between the upper body 7 and the main body 1, and the pressure resistance of this part is extremely low compared to other piping parts. There is.

Damage to the hydraulically responsive gas valve may be prevented by increasing the pressure resistance of this part, but the volumetric expansion force when water freezes is extremely high, and damage to other parts with weak pressure resistance cannot be avoided. .

The object of the present invention is to enable the main body and the upper main body to move in the direction of volume change in response to freezing of water, in order to prevent damage to the hydraulically responsive gas valve due to freezing of the water circuit.

The technical means of the present invention for solving the above problems is to protrude a part from the periphery of the cavity of one main body and fit it into a recess formed at the periphery of the cavity of the other body. The two main bodies are joined together by pressure through a spring with a predetermined biasing force.

The above technical means of the present invention operates as follows.

When the water circuit freezes, the volume of the frozen water in the empty space in the water circuit expands, and a force acts on the main body and the upper main body in a direction that separates their joints.

However, since the joint between the upper body and the main body is compressed via a spring, when the volumetric expansion during freezing exceeds a certain level, the joint is separated against the spring, and the volume expands according to the expansion during freezing. The main body and the upper main body themselves do not undergo any deformation due to the change in the volume of the empty chamber or the leakage of frozen and expanded water to the outside.

When the temperature of the water circuit reaches a certain level and the frozen state is removed, the collar of one body fits into the concave part of the other body, and both are compressed by a spring. The relative position between the upper body and the main body will be restored to the initial state.

Thereafter, since each part is in an initial state, that is, a normal state, the hydraulically responsive gas valve will operate properly, and damage to the hydraulically responsive gas valve due to freezing of water can be prevented.

The present invention has the following unique effects.

Since the upper body and the main body are fitted at their joints, when they both return to their initial positions when the freeze is thawed, they move along this fitting direction, resulting in high accuracy in returning to their initial positions. Inconveniences in subsequent operations, such as changes in operating pressure due to changes in the return position, can be prevented.

In addition, the part of the water circuit with the lowest pressure resistance,
Since the valve is deformed in a fixed direction at a low inflation pressure, there is no risk of damage to parts other than the hydraulically responsive gas valve.

Hereinafter, details of the embodiments of the present invention will be further explained based on the drawings.Hereinafter, the structure and effects of the present invention will be explained in detail according to the illustrated embodiments.1 is a main body, which runs from an inlet 2 through a vacant space 3 to an outlet 4.
A water circuit 5 is formed, and a diaphragm 6 closes the opening at the upper end of the cavity to force its periphery to ensure airtightness between the upper body 7 attached to the body 1 and the body 1, and further , the upper body 7 is provided with a cavity 8 that faces the cavity 3 via a diaphragm 6, and communicates this cavity with a venturi portion 9 provided at the outlet 4.

The main body 1 and the upper main body 7 are screwed into one body, and a cylindrical body 12°12 containing springs 11, 11 is fitted onto the screw 10.10, and the lower and upper ends of the cylindrical body are An appropriate gap is provided between the flange portions 13 of the main body T, so that the upper main body γ and the main body 1 are in a state where the peripheral edge of the diaphragm 6 is sandwiched with an appropriate clamping force.

Further, the peripheral edge of the collar portion 13 of the upper main body 7 is in a state of being fitted into a recessed portion 14 formed in the main body 1.

Next, the upper body 7 has a gas circuit 15 independent of the water circuit.
Further, a valve body 16 provided in the gas circuit and biased toward the valve closing side is inserted, and the valve body is opened and closed by a valve shaft 17 corresponding to the diaphragm 6. .

A spring 18 that applies a closing force to the valve body 16 is set appropriately in advance, and the valve body 16 is automatically opened by a thrust corresponding to the pressure difference between the chamber 3 and the chamber 8.

In the case of the embodiment described above, when a flow occurs in the water circuit 5,
Due to the action of the venturi 9, the pressure on the side of the cavity 8 is lower than the pressure on the side of the cavity 3, and in response, the valve stem 17 is pushed in and the valve body 16 opens. Room 3
, 8 become the same, and the valve body 16 is automatically closed by the biasing force of the spring 18.

When the inside of the water circuit 5 freezes in winter, the water inside the empty chamber 3.8 expands in volume due to freezing, and the main body 1 made of brass etc.
Although the upper main body 7 tends to deform, since the bonding force between the two is appropriately set in advance by the spring ILll, the two separate in response to the volumetric expansion, and this deformation is prevented.

When the frozen state is released, the main body 1 and the upper main body 7 return to their normal state and once again perform the function of the hydraulically responsive gas valve described above.

Here, although the upper body 7 and the body 1 are in a small range,
Since they are in a fitted state with each other, their positional relationship is always stable during separation and return operations, and there is no problem with the operation of each part after return.

As described above in detail, the hydraulically responsive gas valve of the present invention has a diaphragm 6 interposed between the main body 1 and the upper main body 7, and has a collar extending from the periphery of the cavity of one of the main bodies. A recessed part 1 in which a part 13 is formed at the periphery of the cavity of the other main body.
4, and the main body 1 and the upper main body 7 are pressed together by a spring of appropriate strength.
Damage to various parts of the water circuit 3 when it freezes is prevented, and after it thaws, it automatically returns to normal operation.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, and in the figure, 1...
...Main body, 7... Upper main body, 13...
-Brim part, 14... recessed part.

Claims (1)

[Scope of utility model registration request] In a hydraulically responsive gas valve in which a diaphragm is interposed between the main body and the upper body, a portion is protruded from the periphery of the cavity of one body, and this is inserted into a recess formed on the periphery of the cavity of the other body. A hydraulically responsive gas valve in which the two main bodies are fitted together and pressed together via a spring with a predetermined biasing force.