JP2010151212A - Can protecting valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safe can protecting valve which smoothly and securely operates. <P>SOLUTION: The can protecting valve is equipped with an inflow passage 1, an outflow passage 2, a packing 4 for blocking the inflow passage 1, a spring 6 for fixing the packing 4 to the inflow passage 1 via a guide 5, a pressure-adjusting shaft 7 for adjusting/setting pressure of the spring 6, and a body 3 which forms an outline. An end part of the guide 5, which is not fixing the packing 4, is formed to be an approximately cylindrical shape, and the approximately cylindrical-shaped end part of the guide 5 is inserted into the spring 6, which firmly fixes the spring and the guide so as to hardly generate leakage between the packing and the inflow passage. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a can body protection valve for preventing pressure damage of a hot water storage type water heater.

  Conventionally, a water heater having a hot water storage tank such as a heat pump type water heater or an electric water heater has a pressure relief structure in order to prevent the hot water tank from being pressurized and damaged.

  FIG. 3 is a schematic view of a conventional hot water storage type water heater. As shown in FIG. 3, a conventional hot water storage type hot water heater includes a hot water storage tank 101 that stores water, a water supply pipe 103 that supplies water to the hot water storage tank 101 from a water supply source via a pressure reducing valve 102, and water in the hot water storage tank 101. Heating tank (not shown), a relief valve 104 for discharging the expanded water boiled by the heating means to the outside of the hot water storage tank, and the interior of the hot water storage tank 101 when the pressure reducing valve 102 or the relief valve 104 fails. When the pressure becomes higher than the pressure, it has a can body protection valve 105 for discharging water out of the hot water storage tank 101 (see, for example, Patent Document 1).

  FIG. 4 is a configuration diagram of a can body protection valve provided in a conventional hot water storage type water heater. As shown in FIG. 4, in the conventional can body protection valve 105, an inflow path 202 through which water flows in and an outflow path 203 through which water flows out are formed in a body 201 forming an outer shell. The channel 203 is configured such that the channel is connected inside the body.

A packing 204 covering the inflow path 202 is provided in a flow path connecting the inflow path 202 and the outflow path 203, and the packing 204 is held by a spring 206 through a washer 205 as a guide. A pressure adjusting shaft 207 for adjusting the pressure is set. Then, the pressure of the spring 208 is set by the pressure adjusting shaft 207, and when a certain pressure (the pressure of the spring 208 set by the pressure adjusting shaft 207) or more is applied from the inflow path 202, the packing 204 moves, and the inflow path Water is discharged from 202 to the outflow passage 203. As shown in FIG. 5, the washer 205 has a triangular protrusion and is in contact with the body 201 at a very small number of points.
JP 2006-132859 A

  However, since the conventional can body protection valve has a structure in which the packing 204 as a seal portion is simply strongly pressed by the pressure adjusting spring 206, the tip of the outflow passage 203 is clogged or blocked by freezing or the like. Then, the pressure balance is lost, and the balance of the spring pressing the packing is lost. As a result, a minute leak occurs between the packing 204 and the inflow path 202, and the leakage of hot water does not stop. It was. Also, once leaked, the spring remains buckled and is difficult to return.

  An object of the present invention is to solve the above-mentioned conventional problems, and to provide a safe can body protection valve that operates smoothly and reliably.

In order to solve the above-described conventional problems, the can protection valve of the present invention includes an inflow path, an outflow path, a packing that seals the inflow path, a spring that fixes the packing to the inflow path via a guide, and a spring. A pressure adjusting shaft for pressure adjustment setting and a body forming an outer shell, and the end of the guide that does not suppress the packing is made into a substantially cylindrical shape, and the substantially cylindrical end of the guide is inserted into a spring. Thus, since the spring and the guide are firmly fixed, it is difficult for leakage to occur between the packing and the inflow path.

  The present invention can provide a safe can body protection valve that operates smoothly and reliably.

  A can body protection valve according to a first aspect of the present invention includes an inflow path, an outflow path, a packing that seals the inflow path, a spring that fixes the packing to the inflow path via a guide, and a pressure adjustment shaft that adjusts the pressure of the spring. The end of the guide that does not hold the packing is made into a substantially cylindrical shape, and the substantially cylindrical end of the guide is inserted into the spring so that the spring and the guide are firmly Since this is fixed, it is difficult for leakage to occur between the packing and the inflow path.

  The can body protection valve according to the second invention is a plurality of protrusions formed on a part of the outer peripheral wall of the guide or the inner wall of the body facing the part of the outer peripheral wall of the guide. The outer peripheral wall of the guide and the inner wall of the body are in contact with each other in the shape of the protrusion, so that the positional relationship between the body and the guide is determined and the guide is difficult to move. Leakage is less likely to occur between

  The can body protection valve according to the third aspect of the present invention, in the first or second aspect of the invention, is simply provided with an air hole for extracting air in a part of the guide located opposite to the packing. If only the packing is inserted into the gasket, the expansion of the air generated in the gap between the guide and the packing due to the internal temperature rise or the like will cause the packing to float or protrude, so this is prevented by providing an air hole. be able to.

  The can body protection valve according to the fourth aspect of the invention has a structure that prevents the can body from being inserted at an angle by making the length dimension of the guide larger than the inner diameter dimension of the body, particularly in the first to third aspects of the invention. .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a configuration diagram of a can body protection valve according to Embodiment 1 of the present invention. As shown in FIG. 1, the can body protection valve of the present invention has a body 3 having a water inflow path 1 and an outflow path 2. The inflow path 1 is connected through a pipe to a hot water storage tank (not shown) that stores high-temperature water. Moreover, the outflow path 2 side is open to the external air. The inflow path 1 and the outflow path 2 are connected by a flow path inside the body 3, and hot water is discharged from the inflow path 1 to the outflow path 2 when the pressure in the hot water storage tank abnormally increases.

  Further, a packing 4 is provided in the flow path connecting the inflow path 1 and the outflow path 2, and the inflow path 1 is covered with the packing 4. The packing 4 is pressurized by a spring 6 through a guide 5 from the back side, and the inflow path 1 is covered with the packing 4. Therefore, when a water pressure higher than the pressure applied by the spring 6 is applied from the outside of the inflow path 1, a force acts in the direction in which the spring 6 compresses, and water flows in from the inflow path 1.

Next, the shape of the guide 5 will be described. FIG. 2A is a configuration diagram of the guide 5. In FIG. 2A, the guide 4 has a recess 51 that is a space in which a part of the packing 4 is inserted on the packing 4 side, and a flat surface portion 52 that is pressed from the back side of the packing 4. Prepare. The spring 6 has a coil shape and has a space inside. Therefore, in the present invention, a part of the guide 5 is inserted into the space inside the spring 6 to reduce the swing width of the spring 6. Therefore, the guide 5 has a convex portion 53 that is inserted into the spring 6.

  In addition, an air hole 54 is provided as a flow path for releasing air from the recess 51 on the packing 4 side to the outside, and due to the expansion of the air generated in the gap between the guide 5 and the packing 4 due to an internal temperature rise or the like. This prevents the packing from floating or protruding.

  Moreover, FIG.2 (b) is a front view from the X direction of Fig.2 (a). As shown in FIG. 2 (b), a portion where the body 3 and the guide 5 abut is provided with a plurality of protrusions 55, and the positional relationship between the body 3 and the guide 5 is determined. The structure is difficult to move. In FIG. 2B, a protrusion 55 is provided on a part of the guide 5 side, but the present invention is not limited to this, and as shown in FIG. A plurality of protrusion shapes may be provided on the inner wall of the body 3 positioned opposite to each other.

  Further, the length dimension A of the guide 5 is configured to be longer than the inner diameter dimension B of the body 3. With this configuration, the guide 5 is prevented from being inclined and inserted into the body 3.

  The spring 6 has a pressure adjusting shaft 7 for adjusting the spring pressure. By adjusting the spring pressure with the pressure adjusting shaft 7, it is set how much water pressure is applied and the spring operates to release water from the inlet 1 to the outlet 2.

  The hot water storage hot water heater with a can body protection valve configured as described above has its normal tank pressure adjusted by a relief valve or a pressure reducing valve. As a result, the pressure higher than the pressure set by the pressure adjusting shaft 7 is applied to the inlet 1, and as a result, the packing 4 is pushed in the direction of the spring 6 and operates so as to allow water to escape from the inlet 1 to the outlet 2. .

  The can body protection valve according to the present invention as described above can be applied to a hot water storage type water heater having a hot water storage tank that includes heating means such as an electric heater and a heat pump unit.

The block diagram of the can body protection valve in Embodiment 1 of this invention (A) Configuration diagram of guide in the first embodiment (b) Front view in X direction (C) Front view in X direction (different view) Configuration diagram of a conventional hot water storage water heater Configuration of conventional can body protection valve Front view of conventional guide

Explanation of symbols

1 Inlet 2 Outlet 3 Body 4 Packing 5 Guide 6 Spring 7 Pressure Control Shaft

Claims (4)

An inflow path, an outflow path, a packing that seals the inflow path, a spring that fixes the packing to the inflow path via a guide, a pressure regulating shaft that regulates the pressure of the spring, and a body that forms an outline The can body protection valve is characterized in that the end portion of the guide not holding the packing is formed in a substantially cylindrical shape, and the end portion of the guide in the substantially cylindrical shape is inserted into the spring. A plurality of protrusions are formed on a part of the outer peripheral wall of the guide or an inner wall of the body located opposite to a part of the outer peripheral wall of the guide, and a part of the outer peripheral wall of the guide and the body The can body protection valve according to claim 1, wherein the protrusion contacts the inner wall. 3. The can body protection valve according to claim 1, wherein an air hole for extracting air is provided in a part of the guide located facing the packing. 4. The can body protection valve according to any one of claims 1 to 3, wherein a length dimension of the guide is made larger than an inner diameter dimension of the body.