JPH0630814U - Pressure sensitive valve - Google Patents

Abstract

(57) [Summary] [Purpose] In a diaphragm type pressure reducing valve, the sensitivity of the diaphragm (3) during normal operation does not impair the sensitivity of the pressure sensitive operation, and even if the diaphragm (3) is damaged, the valve box body
(1) Prevent water leaks. [Composition] The outside of the diaphragm (3) is attached to the auxiliary diaphragm (3
a) and a spring (32) is interposed between the center of the auxiliary diaphragm (3a) and the spring case (4), and the valve body in the center of the auxiliary diaphragm (3a) and the diaphragm (3).
(2) Attached so that it can be separated from the mounting part

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pressure-sensitive valve, and more particularly to a pressure-sensitive valve such as a pressure reducing valve in which a pressure change on the secondary side is replaced by a displacement of a diaphragm and a valve element connected to the diaphragm is operated. Is.

[0002]

[Prior art and problems]

 A pressure reducing valve is a typical pressure-sensitive valve that operates a valve element by the pressure acting on a diaphragm. In this case, as shown in Fig. 1, a tubular portion formed inside the valve body (1). The lower end of (11) serves as a valve seat (12), and the valve rod (21) of the valve body (2) facing the valve seat (12) is projected upward by penetrating the tubular portion (11), The valve rod is attached to the backing plate (31) attached to the diaphragm (3) that closes the upper chamber of the secondary chamber, that is, the empty space on the downstream side of the valve seat (12) in the box body (1). The upper end of (21) is connected. The diaphragm (3) is housed in a spring case (4) connected to the upper end of the valve box body (1) and screwed into a tubular part (41) formed at the central top of the spring case (4). A spring (32) for setting a secondary pressure is interposed between the adjusting screw (42) and the contact plate (31). Further, a piston portion (22) is provided in a portion penetrating the tubular portion (11), and this piston portion (22) slides on the tubular portion (11) in an airtight outer peripheral state.

As shown in FIG. 2, the pressure reducing valve (V ₁ ) having the above structure is inserted into the inlet side of the water supply circuit in order to maintain the tank internal pressure of the electric water heater (H) at a constant pressure, and the relief valve Used with (V ₂ ). In the pressure reducing valve (V ₁ ) of this usage example, when water is supplied from the primary chamber (1a) upstream of the tubular portion (11) to the secondary chamber (1b) side, the pressure in the secondary chamber (1b) side is When the pressure reaches the set pressure, the valve body (2) closes the valve seat (12) by the pressure acting on the diaphragm (3), and when the pressure on the secondary chamber (1 b) side decreases, The valve body (2) is opened against the pressure acting on the diaphragm (3), and by repeating these operations, the pressure on the secondary chamber (1b) side, that is, the electric water heater (H). The tank internal pressure is maintained at the set pressure. This set pressure is determined by the urging force of the spring (32), but in order to improve the accuracy of this set pressure, the breathing hole (43) is formed in the spring case (4). The presence of this breathing hole (43) allows the inflow and outflow of air between the inside and outside of the chamber surrounded by the diaphragm (3) and the spring case (4) when the diaphragm (3) is displaced in response to pressure changes. Therefore, the diaphragm (3) operates sensitively in response to pressure changes.

However, in this conventional device, when the diaphragm (3) is broken, the water in the water supply circuit to the electric water heater (H) leaks from the breathing hole (43). If water leakage continues from this part, water near the location where the pressure reducing valve (V ₁ ) is installed will be significantly wetted, and in some cases, it may cause an accident such as a leak. In order to eliminate such an inconvenience, it is possible to close the breathing hole (43), but as described above, by closing the breathing hole (43), the diaphragm (3) and the spring case (4) are closed. If the space between them is sealed, the sensitivity of the operation of the diaphragm (3) due to the pressure change of the secondary chamber (1b) becomes poor and the error becomes large, so that accurate pressure-sensitive operation cannot be performed.

The present invention has been made in view of the above-mentioned point. “The valve body (2) connected to the diaphragm (3) that operates according to the pressure change is connected to the primary chamber (1a) and the secondary chamber”. In the spring case (4) facing the valve seat (12) formed at the boundary with (1b), covering the outer surface of the installation part of the diaphragm (3) and having the suction hole (43). In a pressure sensitive valve equipped with a spring (32) for setting the next pressure, the sensitivity of the pressure sensitive operation of the diaphragm (3) during normal operation is not impaired, and the valve body is not damaged even if the diaphragm (3) is damaged. The task is to prevent water leakage from (1).

[0006]

[Technical means]

 The technical means of the present invention for solving the above-mentioned problem is that "the outer side of the diaphragm (3) is covered with an auxiliary diaphragm (3a), and the space between the center of the auxiliary diaphragm (3a) and the panel case (4). The spring (32) is interposed, and the center of the auxiliary diaphragm (3a) and the mounting portion of the valve body (2) of the diaphragm (3) are in contact with each other so as to be separable. ”

[0007]

[Action]

 The above technical means act as follows. The outside of the diaphragm (3) is covered by the auxiliary diaphragm (3a), but the spring (32) for setting the secondary pressure is interposed between the center of the outside auxiliary diaphragm (3a) and the spring case (4). It is equipped. Therefore, the biasing force of the spring (32) reaches the diaphragm (3) via the auxiliary diaphragm (3a). On the other hand, the diaphragm (3) and the auxiliary diaphragm (3a) only contact each other at the center, but since the internal pressure acts on the diaphragm (3), the diaphragm (3) and the auxiliary diaphragm (3a) are The valve body (2) operates in the same manner as in the conventional case while operating in the contact state.

At this time, since the breathing hole (43) is formed in the spring case (4), the sensitivity of the operations of the auxiliary diaphragm (3a) and the diaphragm (3) does not decrease. If the diaphragm (3) breaks, the space between the auxiliary diaphragm (3a) and the diaphragm (3) will be in communication with the inside of the secondary chamber (1b), but as long as the auxiliary diaphragm (3a) is not damaged, No leakage occurs. When the diaphragm (3) is damaged, the pressure in the secondary chamber (1b) acts on the auxiliary diaphragm (3a) via the damaged part of the diaphragm (3), but the secondary pressure is not applied to the diaphragm (3). Neither the internal pressure of the chamber (1b) nor the urging force of the spring (32) acts, and the valve body (2) does not perform pressure-sensitive operation.

Therefore, it is possible to judge the damage of the pressure sensitive valve from the abnormality of the other part of the pipe.

[0010]

【effect】

 Even if the diaphragm (3) is damaged, water does not leak to the outside, so the inconvenience caused by this water leakage can be eliminated. In addition, since air in the chamber above the auxiliary diaphragm (3a) can flow in and out through the breathing hole (43) during pressure-sensitive operation of the diaphragm (3), the diaphragm (3) and the auxiliary diaphragm (3a) can be discharged. The sensitivity of the operation of) is not impaired.

Further, when the diaphragm (3) is damaged, the valve body (2) is in a free state and does not perform pressure-sensitive operation. Therefore, the diaphragm (3) is damaged due to an abnormality in other parts of the pipe. Can be determined.

[0012]

【Example】

 Next, the embodiment of the present invention described above will be described in detail with reference to FIG. In this embodiment, the present invention is applied to a pressure reducing valve, and the valve body (2) is opposed from the downstream side of the valve seat (12), and the valve stem (21) is attached to the valve seat (12). ) Is formed through the cylindrical part (11), and the piston part (22) is slidably accommodated in this penetrating part, and the upper end of the valve rod (21) protruding upward from the cylindrical part (11). Is screwed in the center of the diaphragm (3).

In this pressure reducing valve, the diameter of the piston portion (22) is set to be slightly larger than that of the valve seat (12), and the valve body when the internal pressure of the secondary chamber (1b) reaches the set pressure The urging force required to close the valve in (2) is prevented from becoming excessive. The connecting part between the valve stem (21) and the diaphragm (3) has a screw-fastened structure with a nut.The flange (23) provided near the upper end of the valve stem (21) and the upper surface of the diaphragm (3) With the contact plate (31) facing each other, the central part of the diaphragm (3) is screwed so as to pinch it.The size of this contact plate (31) is slightly smaller than that of the diaphragm (3). It is set to a small degree.

An auxiliary diaphragm (3a) is arranged so as to cover the outer surface of the diaphragm (3), and the peripheral edge of the auxiliary diaphragm (3a) and the peripheral edge of the diaphragm (3) are both in the valve box body. It is fixed to the mounting flange part (13) on the upper surface of (1) using the flange part (44) at the periphery of the spring case (4). In other words, the peripheral portions of these two diaphragms are sandwiched and sealed by being sandwiched between the flange portion (13) and the flange portion (44).

A cup body (5) is attached to the outer surface of the center of the auxiliary diaphragm (3a), and the bottom portion of the cup body (5) is supported by a cylinder screw (51) and a plate nut (52). It is screwed to the center of the diaphragm (3a). At the center of the cylinder screw (51), there is formed a recess (53) capable of accommodating the fixing nut (24) screwed onto the upper end of the valve rod (21). The fixing nut (24) is housed in 53). The tip of the cylindrical screw (51) protruding outward from the plate nut (52) is provided with an adjusting screw (42) screwed into the cylindrical portion (41) formed at the central top of the spring case (4). ) Is fitted to one end of the spring (32). Therefore, the urging force of this spring (32) acts on the diaphragm (3) and the valve rod (21) from the backing plate (31) via the central cylinder screw (51) of the auxiliary diaphragm (3a). Becomes

In this embodiment, even if the diaphragm (3) is damaged, since the outer surface of the diaphragm (3) is covered with the auxiliary diaphragm (3a), even if the diaphragm (3) is damaged, the valve box body ( 1) There is no worry of leaking outside. Further, under normal conditions, the valve body (2) performs a pressure-sensitive operation due to the balance between the biasing force of the spring (32) and the pressure on the side acting on the diaphragm (3), and at this time, the auxiliary diaphragm (3a) and the spring case (4 Since the vacant space between and) communicates with the outside through the breathing hole (43) formed in the battery case (4), the sensitivity of the pressure sensitive operation is also sufficient.

In this embodiment, the cup body (5) has a body portion that opens upward, and the diameter of the body portion (54) is the outer circumference of the spring case (4). The diameter is set so that it can be just press-fitted into the body (45). Further, as described above, the diameter of the piston portion (22) is set to be slightly larger than that of the valve seat (12). With this configuration, in the circuit configuration shown in FIG. 2, when the diaphragm (3) is broken, the internal pressure of acts on the lower surface of the auxiliary diaphragm (3a) and is lifted, but the diameter of the body (54) is Since it is set so that it can be just press-fitted into the outer peripheral body (45), if the diaphragm (3) is torn, the force of the spring (32) will not be applied to the valve rod (21) due to the press-fitting. Become. On the other hand, since the diaphragm (3) is broken, the valve body (2) is free, but the diameter of the piston part (22) is slightly larger than the diameter of the valve seat (12). The valve body (2) is urged to close the valve seat (12) according to the pressure difference between the primary chamber (1a) and the secondary chamber (1b). Therefore, when the diaphragm (3) is broken, even if the faucet (J) is open, the valve body (2) is closed and the flow of hot water from the faucet (J) is not completely stopped. However, the extremely small amount of leakage is almost stopped to some extent.

Therefore, in this embodiment, when the diaphragm (3) broke, what had been in the state of tap water from the faucet (J) in the normal condition until then was almost stopped when the diaphragm (3) was damaged. Therefore, this change can determine the abnormality of the diaphragm (3). In addition, if the diaphragm (3) is damaged while the faucet (J) is in the open state, the hot water discharge state is automatically stopped, so wasteful drainage can be prevented.

On the other hand, if the diaphragm (3) is damaged when the faucet (J) is closed, the secondary pressure will gradually increase after this, and the drainage from the relief valve (V ₂ ) will be increased. The abnormality can be judged by. It is desirable that the recessed portion (53) is not press-fitted into the outer peripheral body portion (45) when the diaphragm (3) is not broken and is normal. Therefore, when the valve body (2) normally closes the valve seat (12), the upper end of the body (54) is set lower than the outer peripheral body (45) of the spring case (4). You should keep it.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a conventional example.

[Fig. 2] An explanatory view of a usage example of a pressure reducing valve (V ₁ ).

FIG. 3 is a sectional view of an essential part of the embodiment of the present invention.

[Explanation of symbols]

 (3) ・ ・ ・ Diaphragm (2) ・ ・ ・ Valve body (1a) ・ ・ ・ Primary chamber (1b) ・ ・ ・ Secondary chamber (12) ・ ・ ・ Valve seat (43) ・ ・ ・ Breathing hole (4 ) ・ ・ ・ Spring case (32) ・ ・ ・ Spring (3a) ・ ・ ・ Auxiliary diaphragm (21) ・ ・ ・ Valve rod (1) ・ ・ ・ Valve box body (11) ・ ・ ・ Cylindrical part (22) ・ ・・ Piston

Claims (3)

[Scope of utility model registration request] 1. A diaphragm that operates in response to changes in pressure.
The valve body (2) connected to (3) is made to face the valve seat (12) formed at the boundary between the primary chamber (1a) and the secondary chamber (1b), and the diaphragm (3) installation part In a pressure-responsive valve having a spring case (4) having an outer surface covered with a breathing hole (43) and a spring (32) for setting a secondary pressure, the outside of the diaphragm (3) is attached to the auxiliary diaphragm (3a). ), This auxiliary diaphragm (3
Insert the spring (32) between the center of a) and the spring case (4),
A pressure sensitive valve in which the center of the auxiliary diaphragm (3a) and the valve body (2) mounting portion of the diaphragm (3) are in contact with each other so as to be separable from each other. 2. The pressure sensitive valve according to claim 1, wherein the diaphragm (3) is a diaphragm which responds to a secondary pressure, and a pressure reducing valve which maintains the secondary pressure at a set pressure. 3. A valve rod (21) of a valve body (2) is provided with a piston portion (22) slidably accommodated in a tubular portion (11) in a valve body (1). The diameter of the piston part (22) is set to the valve body
The pressure sensitive valve according to claim 2, wherein the valve seat (12) is set to be slightly larger than the valve seat (12) facing the valve (2).