JP4789826B2 - Valve device - Google Patents

Description

  The present invention relates to a valve device disposed in a water passage.

  In the valve device disposed in the water passage, if the water passage or the valve device is filled with water and exposed to a low temperature in winter or the like, the internal water may freeze. In addition, when the water in the valve device is inspected by passing water through the valve device before shipping from the factory, and the water in the valve device remains in the warehouse in winter, the water in the valve device may freeze. Occurs.

  When water freezes, the volume expands. However, since water and ice are incompressible substances, the water passage and the valve device may be damaged when the volume expands.

In order to eliminate such problems, an expansion absorber made of a rubber material having a plurality of bubbles inside is disposed in the water passage, and when the volume of water expands, the volume of expansion expands itself. There is known one that alleviates pressure rise in a water passage or a valve device and prevents breakage (for example, see Patent Document 1).
JP 2003-64263 A (FIG. 5)

  In the above-mentioned conventional one, the surface of the expansion absorbent material is deteriorated due to chlorine dissolved in the water because the expansion absorbent material is disposed at a position in direct contact with water in the water passage or the valve device. May peel off and be released into water. In addition, it is known that the expansion absorbent material is deteriorated by a relatively small number of compressions and the compression rate is lowered, and there is a problem that the expansion absorption performance is likely to be lowered.

  Then, this invention makes it a subject to provide the valve apparatus which does not produce said malfunction in view of said problem.

In order to solve the above-described problems, a valve device according to the present invention is a valve device disposed in a water passage, and the valve body is expanded by volume expansion when any water in the water passage and the valve body is frozen. In a valve device equipped with a breakage prevention mechanism for preventing breakage, the volume in the passage space is provided in a passage space through which water formed in the valve body passes and moves backward in contact with the water in the passage space. And a storage space is formed on the opposite side of the passage space across the movable member, a spring is stored together with the sponge member in the storage space, and the movable member is moved to the passage space side by the biasing force of the spring. By providing a stopper to restrict the movement of the movable member to the passage space side in the state of being biased to the spring, the movable member is accommodated if the pressure in the passage space does not exceed a predetermined pressure. During configured not to move in the side, further characterized in that the pressure of the housing space inside may move the movable member to communicate with the outside via the vent hole housing space was set to be constant .

  When the water in the water passage or the valve device expands due to freezing, the expansion volume is absorbed by the retracting of the movable member. Note that when the water around the movable member is first frozen, the movable member cannot move backward and cannot absorb the expansion. Therefore, the storage space is filled with a sponge member to prevent entry of low temperature outside air into the storage space as much as possible, and the movable member is prevented from being exposed to low temperature outside air.

A spring is housed in the housing space together with the sponge member, and a stopper is provided to restrict the movement of the movable member toward the passage space while the movable member is biased toward the passage space by the biasing force of the spring. By preloading, the movable member is configured not to move to the storage space side unless the pressure in the passage space exceeds a predetermined pressure, and the movable member is further communicated to the outside through the vent hole. There was configured so that the pressure in the housing even if the moving space becomes constant.

  In order to improve the heat insulation of the sponge member itself, it is desirable to use the bubbles in the sponge member that are independent of each other and do not communicate with each other.

By the way, the storage space may be sealed to prevent the outside air from entering, but when the movable member moves backward, the air in the storage space is compressed and acts in a direction that inhibits the backward movement of the movable member. In addition, when the water pressure becomes high, water may leak into the storage space. However, if the storage space is sealed, the leaked water continues to remain. Therefore, the storage space is allowed to communicate with each other through a vent to the outside.

  As is clear from the above description, the present invention absorbs the volume expansion by moving the movable member backward even if the water in the water passage or the valve device freezes and expands. Damage to the device can be prevented. In addition, since the storage space is filled with a sponge member, the periphery of the movable member is prevented from freezing at an early stage, and the movable member can be retracted for a long time, so that the damage can be reliably prevented. .

  Referring to FIG. 1, reference numeral 1 denotes a thermal valve disposed in a warm water passage for floor heating. The thermal valve 1 includes a unit 2 filled with wax. When the unit 2 is heated by a heater 21, the internal wax expands and the rod 22 is pushed out. When the rod 22 is pushed downward in the figure, the valve shaft 31 is pushed downward via the spacer 23.

  The valve body 3 is attached to the lower end of the valve shaft 31, and when the valve body 3 is pushed down together with the valve shaft 31, the valve port 43 that communicates the upstream passage space 41 and the downstream passage space 42 opens. I speak.

  In the present invention, the absorbing plate 5 which is a movable member is provided facing the upstream passage space 41. A cap 51 is attached to the side opposite to the upstream side passage space 41 across the absorption plate 5, and a storage space surrounded by the cap 51 and the absorption plate 5 is formed.

  A sponge member 6 and a coil spring 7 are loaded in the storage space. Reference numeral 52 denotes a vent hole. Each bubble in the sponge member 6 is preferably a closed cell. For example, what is used as an expansion | swelling absorber shown in the said patent document 1 is used.

  The coil spring 7 is compressed by a predetermined amount in the storage space, and the absorbing plate 5 is pressed against the stopper 11 by the urging force of the coil spring 7. Therefore, even if the pressure in the upstream passage space 41 rises for a short time due to a water hammer or the like, the absorption plate 5 is prevented from moving backward.

  When the pressure in the upstream passage space 41 rises, the absorption plate 5 moves backward against the urging force of the coil spring 7. At this time, the air in the storage space is pushed out from the vent hole 52, and the inside of the storage space Air was not compressed. Further, even if water leaks from the absorption plate 5 to the storage space, the water leakage in the storage space is easily dried. Since the inside of the storage space is filled with the sponge member 6, external cold air is prevented from entering the storage space from the vent hole 52.

  By the way, in the above-described embodiment, the present invention is applied to the thermal valve 1. However, for example, as shown in FIG. 2, the present invention may be applied to a motor valve 8 which is another valve device.

  The motor valve 8 includes a motor 81. The rotational force of the motor 81 is decelerated in the gear box 82, and the rotary shaft 83 is reciprocated in the left-right direction in the drawing. In this case, the absorbing plate 86 is set facing the passage space 85. And the storage space was formed by covering the back part of the absorption board 86 with the cap 87, and the sponge member 89 was accommodated in the storage space. Reference numeral 88 denotes a vent hole.

  In the above embodiment, the storage space is provided on the outer peripheral surface side of the valve device. However, as shown in FIG. 3, the storage space may be provided in the valve body 3. In this structure, a storage space is provided in the valve body 3, and the opening of the storage space is closed by the absorbing plate 9. A sponge member 91 and a coil spring 92 were accommodated in the storage space closed by the absorbing plate 9.

  In addition, this invention is not limited to an above-described form, You may add a various change in the range which does not deviate from the summary of this invention.

The figure which shows the structure of one embodiment of this invention Diagram showing the configuration of the reference example Diagram showing the configuration of another reference example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Thermal valve 2 Unit 3 Valve body 5 Absorbing plate 6 Sponge member 7 Coil spring 8 Motor valve 9 Absorbing plate 31 Valve shaft 41 Upstream side passage space 42 Downstream side passage space 43 Valve port 51 Cap 52 Ventilation hole 81 Motor 82 Gear box 83 Rotating shaft 85 Passage space 86 Absorber plate 89 Sponge member 91 Sponge member 92 Coil spring

Claims (2)

A valve device provided in a water passage, comprising a breakage prevention mechanism for preventing breakage of the valve body due to volume expansion when any water in the water passage and the valve body is frozen. A movable member is provided in the passage space through which water formed in the valve body passes, and the volume of the passage space is increased by retreating in contact with the water in the passage space. A storage space is formed on the opposite side of the passage space, a spring is stored together with the sponge member in the storage space, and the movable member is urged toward the passage space side by the biasing force of the spring to the passage space side of the movable member. By providing a stopper for restricting movement and preloading the spring, the movable member is configured not to move toward the storage space unless the pressure in the passage space exceeds a predetermined pressure. Valve apparatus characterized by and communicates with the outside through the vent hole even when moving the movable member the pressure in the storage space is set to be constant. Bubbles in the sponge member is a valve device according to claim 1, characterized in that independent not communicate with each other.

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