JP2008121289A - Water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problems: a valve body cannot be opened because the valve body is pressed against a valve seat by high water pressure, when the high water pressure acts in the valve opening direction of an electromagnetic valve by a water hammer etc., in the case where the two electromagnetic valves 3 and 4 are serially provided for the prevention of the occurrence of poor water sealing; and a block 2 may be broken because water accumulated in an intermediate water supply passage 22 is expanded when being finally frozen, after the block 2 is cooled from a surface of the block 2 at a low temperature of outside air in winter etc., in the case of the water is kept in the state of being accumulated in the intermediate water supply passage 22 for connecting both the electromagnetic valves 3 and 4 together. <P>SOLUTION: First and second relief valves 6 and 7 are connected to both the electromagnetic valves 3 and 4 in parallel, respectively; a branch passage 71 for connecting the second relief valve 7 to the intermediate water supply passage 22 is connected to an approximately central portion of the intermediate water supply passage 22; and finally, the water pressure is released to a downstream water supply passage 23 from a portion to be frozen. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a water supply apparatus that is used in a hot water supply apparatus and opens and closes a water supply path through which hot water flows.

  As this type of conventional water supply device, for example, a water supply device constituted by an electromagnetic valve called a pilot valve is known (see, for example, Patent Document 1). However, if there are a series of solenoid valves, there is a risk of poor water stoppage if dust or the like is caught between the valve body and the valve seat. In view of this, two solenoid valves are connected in series to form two stations so that a water stop failure does not occur.

Specifically, two solenoid valves are connected in series by connecting an upstream solenoid valve and a downstream solenoid valve via an intermediate water supply path.
Japanese Patent Laying-Open No. 2005-172070 (FIG. 1)

  When high water pressure acts on the primary side of the solenoid valve, that is, in the valve closing direction by a water hammer or the like, the valve body is pressed against the valve seat by the high water pressure, and the valve body cannot be opened.

  Then, this invention makes it a subject to provide the water supply apparatus which can open both of the two solenoid valves connected in series reliably in view of said problem.

  In order to solve the above problems, a water supply device according to the present invention is a water supply device in which two electromagnetic valves are attached in series to a water supply path, and is attached in parallel to an upstream solenoid valve. A first valve that opens when a high water pressure exceeding a predetermined water pressure is applied to the upstream water supply path connected to the upstream side, and releases pressure to the intermediate water supply path that connects the upstream solenoid valve and the downstream solenoid valve. The relief valve is installed in parallel to the downstream solenoid valve, and is opened when a high water pressure exceeding a predetermined water pressure is applied to the intermediate water supply passage, and is connected to the downstream side of the downstream solenoid valve. A second relief valve for releasing pressure is provided in the flowing water supply path.

  When a high water pressure acts on the primary side of the upstream solenoid valve, the high water pressure is released to the intermediate water supply path which is the secondary side by the first relief valve. However, since the intermediate water supply path is the primary side of the downstream solenoid valve, the downstream solenoid valve is difficult to open due to the released high water pressure. Therefore, the high water pressure acting on the primary side of the downstream solenoid valve is released to the downstream downstream water supply path by the second relief valve.

  The water pressure in the intermediate water supply channel may become high due to the water pressure released from the upstream water supply channel, or the water in the water supply channel may freeze and become high in winter.

  When the upstream solenoid valve and the downstream solenoid valve are attached to one manifold block, and the intermediate water supply path is formed in a substantially intermediate portion of the manifold block, the intermediate water supply path The water inside freezes at the end. In particular, since the substantially central portion of the intermediate water supply passage freezes last, it is desirable to connect the second relief valve to the substantially central portion of the intermediate water supply passage.

  As is clear from the above description, the present invention allows the high water pressure acting on both solenoid valves to escape with the two relief valves, so that the opening of the solenoid valve is not hindered by the water pressure. Both solenoid valves can be opened reliably.

  Referring to FIG. 1, reference numeral 1 denotes a water supply apparatus according to the present invention. The water supply device 1 is composed of a resin manifold block (hereinafter referred to as a block) and two electromagnetic valves 3 and 4 attached to the block 2. The solenoid valve 3 is a pilot type solenoid valve. The auxiliary solenoid valve 5 is for enabling the solenoid valve 4 to be opened with a small force by reducing the pressure on the primary side of the solenoid valve 4 before the solenoid valve 4 is opened. Thus, a small actuator can be used as the actuator built in the electromagnetic valve 4.

  The block 2 is provided with an upstream water supply path 21 communicating with the primary side of the electromagnetic valve 3, and hot water flows into the block 2 from the upstream water supply path 21. If the solenoid valve 3 is open, the hot water that has flowed in passes through the solenoid valve 3 and flows into the intermediate water supply path 22. The intermediate water supply path 22 is connected to the primary side of the solenoid valve 4, and hot water flows from the intermediate water supply path 22 into the downstream water supply path 23 as long as the solenoid valve 4 is open. Then, it flows out of the block 2 from the downstream water supply path 23.

  A first relief valve 6 is attached to the electromagnetic valve 3 across the upstream water supply path 21 and the intermediate water supply path 22 in parallel with the electromagnetic valve 3. Specifically, a branch path 61 that communicates with the upstream water supply path 21 is connected to the first relief valve 6, and is connected from the first relief valve 6 to the intermediate water supply path 22 via the joint path 62.

  On the other hand, a branch passage 71 is provided at a substantially central portion of the intermediate water supply passage 22, and this branch passage 71 is connected to the second relief valve 7. The second relief valve 7 is connected to the downstream water supply passage 23 via the joint passage 72.

  According to the above configuration, even if, for example, a water hammer occurs on the upstream side of the water supply device 1 and a high water pressure acts on the primary side of the electromagnetic valve 3, the high water pressure passes through the first relief valve 6 and the intermediate water. It is escaped to the supply path 22. Then, although the water pressure of the intermediate water supply path 22 becomes a high water pressure, the second relief valve 7 is opened and the high water pressure is released to the downstream water supply path 23. As a result, even if a high water pressure acts from the upstream side of the water supply device 1, the high water pressure is released downstream of the water supply device 1, and the high water pressure does not act on the electromagnetic valves 3 and 4. Therefore, both solenoid valves 3 and 4 can be opened smoothly.

  In addition, when the outside air temperature is lowered, such as in winter, if there is no water flow for a long time, the water confined in the intermediate water supply path 22 may freeze. Since the volume expands when water freezes, the block 2 may be damaged.

  However, there is no possibility that the block 2 is damaged in the water supply apparatus 1 having the above configuration. That is, the water in the intermediate water supply path 22 is frozen from both end sides close to the outside air, and the central portion is finally frozen. Since the branch path 71 is connected to the substantially central portion of the intermediate water supply path 22, the second relief valve 7 is opened even if the pressure in the intermediate water supply path 22 rises as the freezing progresses. Thus, the high water pressure is released to the downstream water supply passage 23 and the water pressure in the intermediate water supply passage 22 does not increase until the block 2 is damaged.

  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

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water supply apparatus 2 Block 3 Solenoid valve 4 Solenoid valve 5 Auxiliary solenoid valve 6 1st relief valve 7 2nd relief valve 21 Upstream water supply path 22 Intermediate water supply path 23 Downstream water supply path 61 Branch path 62 Joint path 71 Branch path 72 Combined flow path

Claims (2)

  In a water supply apparatus in which two solenoid valves are attached in series to a water supply path, a predetermined water pressure is applied to an upstream water supply path that is attached in parallel to the upstream solenoid valve and connected to the upstream side of the upstream solenoid valve. A first relief valve that opens when a high water pressure exceeding 10 m is applied and releases pressure to the intermediate water supply path that connects the upstream solenoid valve and the downstream solenoid valve, and a downstream solenoid valve are mounted in parallel. And a second relief valve that opens when a high water pressure exceeding a predetermined water pressure is applied to the intermediate water supply passage and releases the pressure to the downstream water supply passage connected to the downstream side of the downstream solenoid valve. A water supply apparatus characterized by that.   The upstream solenoid valve and the downstream solenoid valve are attached to one manifold block, the intermediate water supply passage is formed in a substantially intermediate portion of the manifold block, and the second relief valve is The water supply apparatus according to claim 1, wherein the water supply apparatus is connected to a substantially central portion of the intermediate water supply path.

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