JP5399655B2 - Pressure release device and on-off valve unit having the same - Google Patents

Description

  The present invention relates to a pressure release device and an on-off valve unit equipped with the same, and in particular, in a hot water supply system including a hot water supply path for supplying hot water from a water heater to a bathtub, the hot water supply path is arranged from the bathtub side to the hot water heater side. The present invention relates to a structure of a pressure release device or an on-off valve unit that is suitable for preventing hot water from flowing backward.

In general, a hot water supply system that supplies hot water from a water heater to a bathtub is provided with a backflow prevention mechanism that includes an electromagnetic valve and a check valve in order to prevent a backflow of hot water from the bathtub side to the water heater. In particular, in a hot water supply system, the water pressure on the water heater side may drop due to water breakage, etc., or the water pressure on the secondary side may exceed the water pressure on the primary side because the bathtub is on the floor of the water heater. As a backflow prevention mechanism having a function of cutting the primary side and the secondary side in the middle of, for example, a configuration in which the air release port is opened and closed by a relief valve 1c interlocked with the valve body of the check valve (for example, Patent Document 1 below) ) To release the secondary pressure to the atmosphere or discharge the secondary hot water when the primary pressure drops, in case the check valve does not function due to clogging etc. A pressure relief device having a configuration (for example, see Patent Documents 2 to 4 below) or the like in which an atmospheric relief valve is provided is used.
JP-A-7-225057 JP 2000-304144 A JP 2003-336906 A Japanese Patent Laid-Open No. 2004-150662

  However, in the configuration of the aforementioned Patent Document 1, since the valve body of the check valve and the relief valve are interlocked, hot water may leak from the relief valve at the time of hot water supply start and stop, and the valve of the check valve Although a method for improving the interlocking structure between the body and the relief valve has also been disclosed, it is still impossible to completely prevent leakage or inflow of air due to a malfunction caused by fluctuations in the pressure on the primary side (Patent Document 3, FIG. 14 and FIG. 15).

  On the other hand, in the configurations of the above-mentioned Patent Documents 2 to 4, the atmospheric pressure release valve itself is relatively simple, but as shown in FIG. Since both sides must be connected separately to the primary side and the secondary side, it is necessary to provide extra piping and piping connections for detecting pressure, and the structure is improved by providing these piping and piping connections. Since it becomes complicated, there is a problem that the manufacturing cost increases, the size is increased, the degree of freedom in layout is reduced, and the risk of water leakage is increased by the amount of pipe connection portions.

  Therefore, the present invention solves the above problems, and in a pressure release device that opens and closes the atmosphere release port according to the pressure relationship between the primary side and the secondary side, a novel pipe and connection structure can be configured easily. By adopting the configuration, the manufacturing cost is reduced, the size is reduced, and the reliability is improved.

  In view of such a situation, in the pressure release device (100) of the present invention, the first flow path portion (101L) is configured inside, and the first connection end (101c) is provided at the end of the first flow path portion. ) And a second flow channel portion (102L) communicating with the first flow channel portion are formed inside, at the end of the second flow channel portion. A second tubular body (102) having a second connection end (102c) connected to the first connection end, and the first flow path portion and the second flow path portion. The flow path (100L) constituted by the bend in the middle of the first flow path part and at least the flow direction of the part opposite to the first connection end and the second flow path part At least a first pressure that communicates with the first flow path portion, and at least the flow direction of the portion opposite to the second connection end is different from each other. A valve serving as a movable partition between the chamber (150A), the second pressure chamber (150B) communicating with the second flow path portion, and the first pressure chamber and the second pressure chamber An atmosphere release valve (150) having a body (151) and an atmosphere release port (103a) opened and closed by the valve body is configured, and a surface portion of the first tube on the side of the second tube (101f) includes a first opening (101d) that opens to the first flow path portion, and a first frame-shaped portion (101e) that protrudes around the first opening. Are integrally provided, and a second frame-like portion (102e) connected to the first frame-like portion is provided on the outer side portion (102f) of the second tubular body on the first tubular body side. A second opening (102d) formed inside the second frame-shaped portion and opening to the second flow path portion; It said air release port formed on the inside of the second frame portion is equal to or provided integrally.

  According to this, as a partition wall movable between the first pressure chamber and the second pressure chamber according to the differential pressure between the fluid pressure in the first flow path portion and the fluid pressure in the second flow path portion. A state in which the configured valve body moves to one of the pressure chambers and closes the atmosphere opening, and a state in which the valve body moves to the other pressure chamber and opens the atmosphere opening. Can be switched. Therefore, in the event of an emergency when the fluid pressure on the primary side drops or the fluid pressure on the secondary side rises, the fluid is discharged through the open air path, or the air is introduced into the flow path to perform edge cutting. Is possible.

  In the present invention, the first frame-like portion provided integrally with the first tubular body and the second frame-like portion provided integrally with the second tubular body are connected via the valve body. Since the first pressure chamber and the second pressure chamber are formed on both sides of the partition wall that can move the valve body, the flow path and the atmosphere are composed of only two parts, the first tube body and the second tube body. An open valve can be configured, and by connecting the first tube body and the second tube body, the first flow channel portion and the second flow channel portion are connected to form the flow channel. An air release valve is configured between the tubes. Therefore, the number of parts is reduced and the time and effort during assembly are reduced, so that the assembly cost is reduced, the whole can be made compact, and there are only two connection parts, so there is a risk of water leakage and the like. Therefore, the reliability can be improved.

Oite this onset Ming, the flow path is configured as a whole a U-shaped or U-shaped, the orientation of at least the first flow in the opposite side portion to the connecting end of the first channel section And the flow direction of at least the second flow path portion opposite to the second connection end is opposite to the flow direction, and the surface portion of the first tubular body has the at least first flow portion. This is the outer surface of the tube wall that constitutes the portion opposite to the connection end. In this case, the flow path is formed in a U-shape or a U-shape as a whole, so that the tube wall on the opposite side of the first connection end of the first tube and the second tube Since at least the second connecting end of the pipe wall on the opposite side of the pipe wall is disposed in parallel and an atmosphere release valve is formed between them, the pressure release device can be configured more compactly, and the first connecting end And the opposing portion of the second connection end, and the first frame-like portion and the opposing portion of the second frame-like portion are arranged in close proximity, so that the assembling work is further facilitated. In particular, the surface of the first tubular body in which the first opening and the first frame-shaped portion are formed is constituted by the outer surface of the tube wall constituting the portion opposite to the first connection end. As a result, the valve body of the air release valve can be disposed in the vicinity of the pipe wall, so that the whole can be configured more compactly.

  In this case, normally, the interval between the tube wall of the first tube body and the valve body constituting the portion opposite to the at least first connection end is opposite to the at least second connection end. It becomes smaller than the space | interval of the pipe wall of the said 2nd pipe body which comprises a part, and the said valve body. As a result, it is possible to easily ensure a margin for forming an air opening in the outer portion of the second tubular body without impairing the compactness of the apparatus.

In this invention , a 1st opening part and a 1st frame-shaped part are provided in the outer surface of the pipe wall of a part on the opposite side to a 1st connection end among 1st pipe bodies. According to this, since the first opening is provided in the tube wall of the first tubular body and is configured in a short pipe shape , the second opening is separated from the tube wall of the second tubular body. because it can be configured to a long pipe shape to the vicinity of the remote valve body, born afford placed side than the valve body of the air opening path second pipe. Here, in one aspect of the present invention, the first opening is an outer surface portion of a tube wall constituting a flow path portion extending in parallel with the second tube of the first tube. It is preferable that the first frame-like portion has a rib shape projecting on the outer surface portion .

In another aspect of the present invention , the first opening opens at a position out of a range where the closing plate of the valve body abuts in a tube wall constituting the first flow path portion. Is preferred. According to this, it is prevented that the closing plate of the valve body is brought into close contact with the tube wall for some reason and the pressure of the first flow path portion is not introduced. Further, at least a portion on the opposite side to the first connection end in the first flow path portion, and at least a portion on the opposite side to the second connection end in the second flow path portion, It is preferable that an air release path that extends in parallel with the first flow path portion and the second flow path portion and opens to the outside after exiting from the atmosphere open port is provided.

  In a different aspect of the present invention, a portion of the flow path where the first opening portion of the first flow path portion is opened and the second opening portion of the second flow path portion are opened. It is preferable that a check valve (110), an on-off valve (120) or a flow meter (130) is arranged between the portion to be operated. Since a check valve, an on-off valve or a flow meter is arranged, pressure loss in the flow path can be more reliably generated and the pressure difference between the first pressure chamber and the second pressure chamber can be increased. It is possible to reliably and stably close the air release valve during supply. In this case, it is preferable to provide a secondary check valve (140) further downstream.

  The on-off valve unit of the present invention further includes any of the pressure release devices described above and an on-off valve (120) for opening and closing the flow path.

  According to the present invention, as described above, the number of parts can be reduced, the labor of assembling work can be reduced, and the number of connection points can also be reduced. Therefore, the whole can be realized with a simple structure, and thus the manufacturing cost can be reduced and the apparatus can be compact. It is possible to achieve an excellent effect of improving the reliability and improving the reliability.

[First Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a normal operation state (atmospheric release valve closed state) of the pressure release device or on-off valve unit of the first embodiment according to the present invention in a section along the flow path direction, and FIG. It is a longitudinal cross-sectional view which shows the operation state (atmosphere release valve open state) in the case of emergency of embodiment by the cross section along a flow-path direction.

  The on-off valve unit (pressure release device) 100 of this embodiment is used in a fluid supply path for supplying fluid from the primary side to the secondary side. For example, supply of a bathtub or the like from a supply system including a water heater Used in a piping system that supplies fluid such as hot water to a place. The on-off valve unit 100 includes a primary side pipe body 101 and a secondary side pipe body 102 connected to the primary side pipe body 101. The primary-side tube body 101 includes a primary-side channel portion 101L therein, and the primary-side channel portion 101L includes an inlet 101a at an upstream end and an outlet 101b at a downstream end. ing. Moreover, the primary side pipe body 101 is provided with the primary side connection end 101c connected to the secondary side pipe body 102 around the outflow port 101b.

  On the other hand, the secondary tube 102 has an inlet 102a at the upstream end and an outlet 102b at the downstream end, and is connected to the primary tube 101 around the inlet 102a. Secondary side connection end 102c. The primary side connection end 101c and the secondary side connection end 102c are connected to each other to form an integral flow path 100L. Both connection ends 101c and 102c are fixed by a press-fitting structure, a tightening structure, and other appropriate fixing means (not shown) as required.

  In the illustrated example, a check valve 110, a solenoid valve (open / close valve) 120, a flow meter 130, and a check valve 140 are provided in the flow path 100L. The flow path 100L bends (refracts or curves) in the middle, thereby forming a U shape or a U shape as a whole. Then, at least the upstream flow direction (leftward in the drawing) in the primary flow path portion 101L and at least the downstream flow direction (rightward in the drawing) in the secondary flow path portion 102L are parallel and opposite to each other. Has been.

  The outer surface part (the primary side pipe body 101 of the primary side pipe body 101) (the pipe wall constituting the flow path portion extending in parallel with the secondary side pipe body 102 in the primary side pipe body 101). 101f of the outer surface of the secondary side tubular body 102) on the downstream side of the secondary side tubular body 102 so as to surround the primary side opening 101d that opens to the primary channel portion 101L and the primary side opening 101d. A primary frame portion 101e having a rib shape formed along a closed line is integrally provided. On the other hand, the outer surface portion of the tube wall on the downstream side of the secondary tube 102 (the tube wall constituting the flow channel portion extending in parallel with the primary tube 101 in the secondary tube 102) (the secondary wall). On the outer surface of the side tube 102, the surface portion on the upstream side of the primary tube 101) is provided with a secondary side opening 102d that opens to the secondary channel portion 102L and an air opening 103a. An outer portion 102f having an air release path 103b provided, and a secondary frame portion 102e having a rib shape formed along a closed line surrounding the secondary opening 102d and the atmosphere opening 103a. Are provided integrally.

The primary side frame-like portion 101e and the secondary side frame-like portion 102e are brought into contact with each other and are in close contact with each other. A valve body 151 is sandwiched between the primary frame portion 101e and the secondary frame portion 102e, and the primary pressure chamber 150A and the secondary pressure chamber 150B are partitioned by the valve body 151. The valve body 151 is a partition configured to isolate the primary-side pressure chamber 150A and the secondary-side pressure chamber 150B, and to be movable according to the pressure difference between the two pressure chambers. In the case of the illustrated example, the valve body 151 has a closing plate 152 disposed at the center, and an outer edge portion connected to the outer edge of the closing plate 152 and sandwiched between the primary frame portion 101e and the secondary frame portion 102e. And a flexible diaphragm 153 provided with In addition, the closing plate 152 and the diaphragm 153 can be configured by a flexible member (elastic member) made of an integral synthetic rubber or the like as illustrated. The valve body 151 is attached in a posture parallel to the outer surface portion 101 f of the tube wall of the primary side tube body 101.

The closing plate 152 of the valve body 151 is configured to open and close the atmosphere opening 103a with respect to the secondary pressure chamber 150B. The operation of the valve body 151 is in accordance with the pressure difference between the primary side pressure chamber 150A and the secondary side pressure chamber 150B. Actually, in addition to the force based on the pressure difference, a coil spring or the like provided as necessary Determined by the elastic force of the elastic member 154, the restoring force of the diaphragm 153 itself, and the force based on the differential pressure between the primary side fluid pressure and the atmospheric pressure applied to both front and back sides of the closing plate 152 that closes the atmosphere opening 103a. It is done. In the present embodiment, when the pressure in the secondary pressure chamber 150B approaches the pressure in the primary pressure chamber 150A and the differential pressure is a predetermined value or less, or the pressure in the secondary pressure chamber 150B is the primary pressure chamber. If it is higher than 150A, the atmosphere opening 103a is opened.

  In the case of the illustrated example, the secondary side pressure chamber 150B is arranged to be opposed to the outer peripheral portion of the primary side pressure chamber 150A and is formed in an annular shape, and the atmosphere opening 103a is provided inside the secondary side pressure chamber 150B, Opposed to the center of the chamber 150A. The air release path 103b extends in parallel between the upstream side of the primary channel part 101L and the downstream side of the secondary channel part 102L, and opens to the outside.

  In addition, the primary side opening 101d opens at a position outside the range where the closing plate 152 (the upper surface in the figure) of the valve body 151 abuts on the tube wall constituting the primary side flow path portion 101L. This prevents the closing plate 152 from being brought into close contact with the tube wall for some reason so that the pressure in the primary channel portion 101L is not introduced into the primary pressure chamber 150A.

  In the on-off valve unit 100 of the present embodiment described above, the atmosphere release valve 150 operates as follows. That is, in a state where fluid can be supplied from the primary side to the secondary side in the fluid supply path, when the solenoid valve 120 is opened, the fluid sequentially passes through the flow path portions 101L and 102L from the primary side to the secondary side. Flowing. Here, the fluid opens the check valves 110 and 140 in the flow path 100L and passes through the inside thereof. At this time, since the fluid pressure on the primary side is higher than the fluid pressure on the secondary side, the valve body 151 (the closing plate 152 and the diaphragm 153) moves to the secondary side against the elastic force of the elastic member 154. The difference between the fluid pressure on the primary side and the fluid pressure on the secondary side that is the source of the force received by the valve body 151 from the primary side at this time is based on the check valve 110, the electromagnetic valve 120, and other structures that cause pressure loss. This is caused by a pressure loss caused by the fluid passing through the flow path 100L. In any case, the closing plate 152 configured to be movable by the diaphragm 153 moves to the secondary side, and closes the atmosphere opening 103a with respect to the secondary pressure chamber 150B.

  In addition, when the electromagnetic valve 130 is closed in the above state, the supply of fluid is stopped, but the fluid pressure generated between the primary pressure chamber 150A, the atmosphere release path 103b, and the secondary pressure chamber 150B via the valve body 151. The closing plate 152 is kept closed by the resultant pressure such as the differential pressure between the atmospheric pressure and the atmospheric pressure, the restoring force of the diaphragm 153, and the elastic force of the elastic member 154. Thus, in a state where the air opening 103a is closed by the valve body 151, the flow path 100L is sealed from the outside.

  On the other hand, if the primary side fluid pressure is lost due to water outage or a water heater failure, or the secondary side pressure increases due to an increase in the bathtub side pressure, etc., the secondary side fluid pressure It may exceed the fluid pressure on the side and cause a back flow. In such a case, the secondary check valve 140 closes to prevent backflow, but malfunctions such as the occurrence of dust biting in the secondary check valve 140 occur. In some cases, backflow cannot be prevented. In this case, the atmosphere release valve 150 of this embodiment operates. That is, when the fluid pressure on the secondary side exceeds the fluid pressure on the primary side, the diaphragm 153 is deformed due to the fluid pressure on the secondary side and the closing plate 152 moves to the primary side as shown in FIG. Since the valve body 151 is separated from the atmosphere opening port 103a, the fluid in the secondary side flow path portion 102L is discharged through the atmosphere opening path 103b via the secondary side pressure chamber 150B. Further, it is configured such that the air flows into the flow path portion 102L from the atmospheric open path 103b, and the fluid in the secondary flow path portion 102L is divided, so that the reverse flow phenomenon of the fluid does not continue.

  In the present embodiment described above, only the primary side pipe body 101 and the secondary side pipe body 102 which are two members are connected, and the primary side flow path part 101L and the secondary side flow path part 102L that are connected to each other. Further, the flow path 100L is configured, and the air release valve 150 is configured by the outer surface portion 101f and the outer portion 102f. Therefore, the piping structure and the connection structure can be easily configured, and the number of parts is reduced and the labor of assembling work is also reduced, so that the manufacturing cost can be reduced. Moreover, the connection part in this embodiment is only two places, the connection location of the primary side connection end 101c and the secondary side connection end 102c, and the connection location of the primary side frame shape part 101e and the secondary side frame shape part 102e. Therefore, since the risk of water leakage and the like is also reduced, the reliability can be improved.

  Furthermore, a primary side opening 101d and a primary side frame-like portion 101e are provided on the outer surface portion 101f of the tube wall of the primary side tube body 101, and the outer side portion 102f of the secondary side tube body 102 facing the tube wall is provided on the outer side portion 102f. Is provided with a secondary opening 102d and a secondary frame 102e, and the atmosphere release valve 150 is configured by connecting the primary frame 101e and the secondary frame 102e. The entire opening device can be configured compactly.

  In particular, in the air release valve 150, the valve body 151 is arranged in a posture that extends along the tube wall of the primary side tube body 101. Therefore, the interval between the tube wall and the valve body 151 can be reduced. In addition, since the space between the tube wall of the secondary side tube body 101 and the valve body 151 can be ensured, it is possible to obtain a margin for forming the air release path 103b while forming the air release valve 150 compact.

  Further, in the present embodiment, the primary side opening 101d is formed in a short pipe shape by being provided in the pipe wall, and the secondary side opening 102d is a long pipe shape extending to the vicinity of the valve body 151 away from the pipe wall. Configured. As a result, there is a margin for disposing the air release path 103b closer to the secondary side pipe body 102 than the valve body 151.

  In the case of the present embodiment, the upstream flow direction of the primary flow path portion 101L and the downstream flow direction of the secondary flow path portion 102L are parallel and opposite to each other, and the upstream primary pipe An air release valve 150 is formed between the tube wall portion of the body 101 and the tube wall portion of the downstream secondary tube 102. Therefore, since the entire unit can be configured as a unit that is well-organized, not only can it be easily transported and stored before installation in the fluid supply path, but it can also be easily installed in narrow spaces during installation.

[Second Embodiment]
Next, a second embodiment according to the present invention will be described with reference to FIG. In this embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. FIG. 3 is a longitudinal sectional view showing a section along the flow path direction in the closed state of the air release valve of the second embodiment.

  In the on-off valve unit (pressure release device) 100 ′ of the present embodiment, the flow path 100L ′ is substantially the same as the first embodiment in that it is configured in a U-shape or a U-shape as a whole. In the atmospheric pressure release valve 150 ′, the secondary opening 102 d ′ is opened and closed by a closing plate 152 at the center of the valve body 151, and the atmosphere opening 103 a ′ is annularly formed around the secondary opening 102 d ′. It differs in that it is provided. Here, the secondary-side pressure chamber 150B ′ is configured by the internal space of the secondary-side opening 102d ′, and the atmosphere opening path 103b ′ includes an annular portion facing the annular atmosphere opening 103a ′. The operation is the same as that of the first embodiment.

  In addition, as shown in the present embodiment, the primary side connection end 101c ′ and the connection side of the secondary side connection end 102c ′ for connecting the primary side flow path portion 101L ′ and the secondary side flow path portion 102L ′ The primary frame portion 101e ′ and the connection portion of the secondary frame portion 102e ′ for configuring the atmosphere release valve 150 ′ can be integrally configured. The first embodiment can also be configured in this way. If it does in this way, it will become possible to perform an assembly operation easily. Further, since the connection surfaces of the two connection locations are formed on the same plane, the assembly work for connecting the primary side pipe body 101 'and the secondary side pipe body 102' can be performed more easily.

  In the present embodiment, the check valve 110 is disposed at the bent portion of the flow path 100L ′. Further, the secondary check valve 140 is not provided in the on-off valve unit 100 ′, and is installed downstream of the secondary-side tube 102 ′ when the on-off valve unit 100 ′ is incorporated in a fluid supply path (not shown). It is arranged in another pipe body 104 to be connected. As described above, in the pressure release device or the on-off valve unit of the present invention, the presence or absence of the electromagnetic valve (on-off valve), check valve, flow meter, and the like arranged in the flow path is not particularly limited, and various The configuration can be taken. However, as described above, members that cause pressure loss such as on-off valves, check valves, flow meters, and other pressure loss structures are arranged in the flow path between the primary side opening and the secondary side opening. It is.

[Third Embodiment]
Next, a third embodiment according to the present invention will be described with reference to FIG. In the present embodiment, the same parts as those in the first embodiment or the second embodiment are denoted by the same reference numerals, and the description thereof is omitted. FIG. 4 is a longitudinal sectional view showing a section along the flow path direction in the closed state of the air release valve of the third embodiment.

  In the on-off valve unit (pressure release device) 100 ″ of the present embodiment, the structure of the atmosphere release valve 150 ″, the connection location of the primary side connection end 101c ″ and the secondary side connection end 102c ″, the primary side frame-like portion 101e ″, The connection location of the secondary frame portion 102e ″ and the arrangement of the secondary check valve 140 are the same as in the second embodiment.

  In the present embodiment, the check valve 110 is not the bent portion of the U-shaped or U-shaped channel 100L ″ but is disposed downstream of the secondary channel portion 102L ″. Is different. However, the check valve 110 is disposed in the flow path between the primary side opening 101d ″ and the secondary side opening 102d ″ as in the above embodiments.

[First comparative example ]
Next, a first comparative example will be described with reference to FIG. Also in this comparative example , the same reference numerals are given to the same parts as those in the first to third embodiments, and the description thereof is omitted. FIG. 5 is a longitudinal sectional view showing a section along the flow path direction in the closed state of the air release valve of the first comparative example .

In the on-off valve unit (pressure release device) 200 of the present comparative example , the primary side pipe body 201 is configured in a straight tube shape, and a primary side connection end 201c is provided at the downstream end, and the primary side connection end 201c. A projecting wall 201T that projects outward along the downstream portion of the secondary tube 201 is provided. On the surface of the projecting wall 201T on the secondary tubular body 202 side, a primary side opening 201d that opens to the primary channel portion 201L is provided and a line that is closed so as to surround the primary side opening 201d. A primary frame portion 201e formed in a rib shape along the rib is integrally provided.

  On the other hand, the secondary side pipe body 202 is provided with a secondary side connection end 202c connected to the primary side connection end 201c, and at a position adjacent to the secondary side connection end 202c, a secondary side flow end 202c is provided. An outer portion 202f is integrally formed on the side of the overhanging wall 201T of the tube wall constituting the path portion 202L. The outer side portion 202f is formed in a rib shape along a secondary side opening portion 202d opened to the secondary side flow passage portion 202L and a closed line so as to surround the periphery of the secondary side opening portion 202d. The secondary side frame-like portion 202e and the atmosphere opening path 203b provided with the atmosphere opening port 203a are integrally provided. The secondary side flow path portion 202L configured in the secondary side pipe body 202 is bent on the upstream side, whereby the flow direction on the upstream side of the primary side flow path portion 201L and the secondary side flow path portion 202L. The direction of the flow on the downstream side is different (the direction in which the mutual angle is 90 degrees), and the flow path 200L composed of the primary flow path portion 201L and the secondary flow path portion 202L is formed in an L shape as a whole. Composed.

In this comparative example , the primary side frame-like portion 201e and the secondary side frame-like portion 202e are connected by sandwiching the outer edge portion of the valve body 251 (the outer edge portion of the diaphragm 253 is sandwiched between them). An open valve 250 is formed, and the valve body 251 has a posture extending in the same direction as the overhanging direction of the overhanging wall 201T, and the interval between the overhanging wall 201T and the valve body 251 is the secondary side flow path portion. 202L is smaller than the interval between the tube wall of the secondary tube 202 and the valve body 251. The atmosphere release valve 250 is similar to that of the second or third embodiment. A valve structure may be employed in which the secondary side opening 202d is opened at the center and the atmosphere opening port 203a is opened at the periphery.

In this comparative example , the flow meter 130 is disposed in the primary flow path portion 201L, the check valve 110 is disposed on the upstream side of the secondary flow path portion 202L, and the electromagnetic valve (open / close valve) 120 has two. The secondary side check valve 140 is arranged at the intermediate part of the secondary side flow path part 202L, and is arranged downstream of the secondary side flow path part 202L. The various pressure loss structures described above exist between the position in the primary flow path portion 201L where the primary side opening 201d opens and the position in the secondary flow path portion 202L where the secondary opening 202d opens. This is also the same as above.

In this comparative example , the same operational effects as those of the above embodiments can be obtained. In particular, by providing a protruding wall 201T that protrudes outward from the tube wall of the primary side tube 201, the secondary side tube 202 is provided. The degree of freedom regarding the posture and position of the device can be increased, so that a more flexible design can be performed. Specifically, since the atmosphere release valve 250 can be configured at the inner corner of the bent portion of the flow path 200L, it can be configured compactly and can be easily incorporated in a narrow place.

  In addition, the compactness can be further enhanced by the connection location of the primary side connection end 201c and the secondary side connection end 202c and the connection location of the primary side frame shape portion 201e and the secondary side frame shape portion 202e being adjacent to each other, In addition, since the connection surfaces of both connection locations are on the same surface, the assembly work can be performed more easily.

Next, a second comparative example different from the above of the on-off valve unit and the pressure release device will be described. The comparative example described below relates to a configuration obtained by improving the conventional structure exemplified in Patent Documents 1 to 4 described above. As described above, in the conventional structures disclosed in Patent Documents 2 to 4, as shown in FIG. 6A, the difference between the fluid pressure on the upstream side (primary side) and the fluid pressure on the downstream side (secondary side). However, when the primary side fluid pressure decreases or the secondary side fluid pressure increases, the valve body 51 moves and the secondary side flow path is closed. It has a structure that opens the part to the atmosphere opening 13a. However, since the air release valve is normally closed, the valve body 51 of the air release valve is always in pressure contact with the valve seat, and this is exposed to high temperature hot water in the flow path, whereby the pressure contact portion (packing) is formed. There were problems such as deterioration and the pressure contact part sticking and the air release valve could not be opened.

  As proposals for solving the above problems, there are JP-A-2004-324666 and JP-A-2005-61639, which all reduce the pressure contact force by using some reaction force. The problem was not solved drastically. That is, the above problem is that the differential pressure and the pressure receiving area of the valve body 51 increase as the differential pressure is applied to the valve body 51 that normally closes the air release port 13a, so that the opening edge of the air release port 13a of the valve body 51 increases. The main cause is an increase in the pressure contact force.

Therefore, in this comparative example, provided with a valve body separately opening and closing the air opening is a pressure receiving portion for receiving a differential pressure, by operating the valve body in conjunction with the movement of the pressure receiving portion due to the change of differential pressure, the valve body The above problem was solved by reducing the dependency of the pressure contact force generated between the open air openings on the pressure difference and the pressure receiving area, and as a result, reducing the pressure contact force even if the pressure difference and pressure receiving area are large.

6 (b) is a schematic diagram showing the basic configuration of this comparative example, FIG. 7 is a longitudinal sectional view showing the air release valve closed state of the comparative example, FIG. 8 shows the air release valve open state shown in Comparative Example It is a longitudinal cross-sectional view.

In the on-off valve unit (pressure release device) 300 of this comparative example , the primary side pipe body 301 and the secondary side pipe body 302 are connected by the primary side connection end 301c and the secondary side connection end 302c, and the primary side flow path portion. 301L and the secondary side flow path portion 302L are connected to form a flow path 300L. A primary-side opening 301d that opens to the primary-side flow passage portion 301L is provided on the tube wall of the primary-side tubular body 301, and extends outward along the downstream portion of the secondary-side flow passage portion 302L from the tube wall in the vicinity thereof. A primary side frame-shaped portion 301e is formed on the overhanging wall 301T provided to protrude so as to surround the periphery of the primary side opening 301d. In addition, a secondary side opening 302d that opens to the secondary side flow path portion 302L is formed on the outer side portion 302f of the secondary side tubular body 302, and a frame-like portion 302e that surrounds the secondary side opening 302d. Is provided.

  When the primary side tubular body 301 and the secondary side tubular body 302 are connected, the primary side frame-shaped part 301e and the secondary side frame-shaped part 302e are supported by the outer edge part of the pressure receiving part 351 (supporting the moving member 352). By connecting in a state where the outer edge portion of the diaphragm 353 is sandwiched, a primary pressure chamber 350A and a secondary pressure chamber 350B are formed.

In this comparative example , a moving member 352 and a diaphragm 353 that supports the moving member 352 are provided as a pressure receiving portion 351 that is a movable partition wall that partitions the primary pressure chamber 350A and the secondary pressure chamber 350B. Here, the elastic member 154 is formed of a coil spring or the like, and always urges the pressure receiving portion 351 toward the primary pressure chamber 350A. These points are basically the same as the conventional structure. However, in this comparative example , a valve body 354 having a link portion 355 that is always interlocked with the movement operation of the pressure receiving portion 351 (moving member 352) and a closing portion 356 connected to the link portion 355 is provided. The link portion 355 is provided with a protrusion that abuts the pressure receiving portion 351. The valve body 354 is pivotally supported in the primary pressure chamber 350A so that the closing portion 356 opens and closes the atmosphere opening 303a of the atmosphere opening path 303b in accordance with the rotation angle.

  That is, as shown in the upper diagram of FIG. 6B, since the primary side fluid pressure is always larger than the secondary side fluid pressure, the pressure receiving portion 351 moves to the secondary side pressure chamber 350B side. As a result, the pressure receiving portion 351 (moving member 352) does not press the link portion 355, and the closing portion 356 closes the atmosphere opening 303a. At this time, since the fluid pressure on the primary side is applied only to the closing portion 356, the pressure contact force generated between the closing portion 356 and the opening edge of the atmosphere opening port 303a is not affected even if the pressure receiving area of the pressure receiving portion 351 is large. Can be small.

  On the other hand, when the primary fluid pressure decreases or the secondary fluid pressure increases and the pressure receiving portion 351 moves toward the primary pressure chamber 350A, as shown in FIG. Since it is pushed by the pressure receiving part 351 to operate the closing part 356 (rotating in the illustrated example), the atmosphere opening port 303a is opened to the primary pressure chamber 350A. Then, the atmosphere flows from the atmosphere opening port 303a, and the fluid in the flow path is cut off.

FIG. 9 is a vertical cross-sectional view showing an atmospheric open valve closed state of another third comparative example , and FIG. 10 is a vertical cross-sectional view showing an atmospheric open valve open state of the comparative example . In this comparative example , the same parts as those in the embodiment shown in FIGS. 7 and 8 are denoted by the same reference numerals, and the description thereof is omitted.

In the on-off valve unit (pressure release device) 300 ′ of this comparative example , a protrusion 352a that protrudes toward the primary pressure chamber 350A is provided on the moving member 352 ′, and the protrusion 352a is formed of a flexible member. The link portion 355 'of the valve body 354' is disposed at a position where it can abut. In addition, the closing portion 356 ′ configured integrally with the link portion 355 ′ normally closes the atmosphere opening port 303a communicating with the atmosphere opening path 303b.

  Here, when the pressure receiving portion 351 ′ moves toward the primary pressure chamber 350A as shown in FIG. 10 due to the decrease in the primary fluid pressure or the increase in the secondary fluid pressure, the pressure receiving portion 351 ′. Since the projection 352a of the valve contacts the link portion 355 'of the valve body 354' to bend the valve body 354 ', the closing portion 356' is separated from the air release port 303a. Open to 350A. As a result, when the atmosphere flows from the atmosphere opening port 303a through the atmosphere opening path 303b, the fluid in the primary flow path portion 301L is cut off.

In these examples , in any of the above comparative examples , the pressure receiving portions 351 and 351 ′, which are movable partition walls provided between the primary pressure chamber 350A and the secondary pressure chamber 350B, are valve bodies 354 and 354. ', And the valve body opens and closes the atmosphere opening port 303a that opens into the primary pressure chamber 350A. For example, the pressure receiving unit drives the valve body, and the valve body serves as the secondary pressure chamber. It is good also as a structure which opens and closes the air release opening opened in 350B. That is, a pressure receiving portion is provided as a partition wall movable between the first pressure chamber and the second pressure chamber, and a valve body interlocking with the pressure receiving portion opens and closes an atmosphere opening opening in the first pressure chamber. The atmosphere opening is opened when the pressure receiving part moves toward the first pressure chamber, and the atmosphere opening is closed when the pressure receiving part moves toward the second pressure chamber. can do. In this case, if the first pressure chamber is a pressure chamber that receives the fluid pressure on the primary side and the second pressure chamber is a pressure chamber that receives the fluid pressure on the secondary side, the configuration of the above comparative example is obtained. The pressure chamber may be a pressure chamber that receives the fluid pressure on the secondary side, and the second pressure chamber may be a pressure chamber that receives the fluid pressure on the primary side.

  In this case, the valve bodies 354 and 354 ′ are disposed in the secondary side pressure chamber 350B, and the atmosphere opening port 303a is provided at a position where it can be opened to the secondary side pressure chamber 350B. The valve bodies 354 and 354 ′ are connected to the pressure receiving portions 351 and 351 ′, and in the emergency, the pressure receiving portions 351 and 351 ′ that move to the primary pressure chamber 350A side have valve bodies 354 and 354 ′ that are different from the above embodiments. What is necessary is just to be comprised so that the atmospheric | air release port 303a may be open | released in the form pulled up.

Further, in each of the above comparative examples , the secondary opening 302d as the second opening is configured in a long pipe shape, and as a result, the pressure receiving part 351 is separated from the tube wall of the secondary tube 302. However, by providing the secondary side opening 302d and the secondary side frame-like portion 302e integrally on the outer surface of the tube wall of the secondary side tubular body 302, the pressure receiving portion 351 is connected to the secondary side tubular body 302. It may be configured close to the tube wall. In this way, it is possible to reduce the size as in the case described above with reference to FIGS.

Note that the pressure release device and the on-off valve unit of the present invention are not limited to the illustrated examples described above, and it is needless to say that various changes can be made without departing from the scope of the present invention. For example, in the first to third embodiments and the first comparative example , the first tubular body is the primary side tubular body, and the second tubular body is the secondary side tubular body. For example, the structure of the release valve is the same as that of the second and third comparative examples shown in FIGS. 6B and 7 to 10, so that the first tubular body is the secondary tubular body. It is also possible to constitute the tube body as a primary tube body.

The longitudinal cross-sectional view of the normal time which shows the cross section along the flow-path direction of 1st Embodiment. The longitudinal cross-sectional view at the time of emergency which shows the cross section along the flow-path direction of 1st Embodiment. The longitudinal cross-sectional view of the normal time which shows the cross section along the flow-path direction of 2nd Embodiment. The longitudinal cross-sectional view of the normal time which shows the cross section along the flow-path direction of 3rd Embodiment. The longitudinal cross-sectional view of the normal time which shows the cross section along the flow-path direction of a 1st comparative example . The basic block diagram (a) of the conventional pressure release apparatus, and the basic block diagram (b) which contrasts and shows the structure of the pressure release apparatus which concerns on another 2nd comparative example . The longitudinal cross-sectional view of the normal time which shows the cross section of another 2nd comparative example . The longitudinal cross-sectional view in an emergency which shows the cross section of another 2nd comparative example . The longitudinal cross-sectional view of the normal time which shows the cross section of another 3rd comparative example . The longitudinal cross-sectional view in an emergency which shows the cross section of another 3rd comparative example .

DESCRIPTION OF SYMBOLS 100 ... On-off valve unit (pressure release apparatus), 100L ... Flow path, 101 ... Primary side pipe body, 101L ... Primary side flow path part, 101c ... Primary side connection end, 101d ... Primary side opening part, 101e ... Primary side frame 102--secondary tube, 102L--secondary flow path portion, 102c--secondary-side connection end, 102d--secondary-side opening, 102e--secondary-side frame-like part, 103a--atmospheric opening , 103b ... Air release path, 150 ... Atmospheric pressure release valve, 150A ... Primary side pressure chamber, 150B ... Secondary side pressure chamber, 151 ... Valve element, 152 ... Closed plate, 153 ... Diaphragm, 154 ... Elastic member, 110 ... Check valve, 120 ... Solenoid valve (open / close valve) 130 ... Flow meter, 140 ... Secondary check valve

Claims (5)

A first flow path portion is formed inside, a first tube body having a first connection end at an end of the first flow path portion, and a second pipe communicating with the first flow path portion. And a second tubular body having a second connection end connected to the first connection end at an end of the second flow path portion.
A flow path constituted by the first flow path portion and the second flow path portion bends in the middle and flows in a portion of the first flow path portion opposite to at least the first connection end. And the flow direction of at least the second connection end of the second flow path portion is different from each other,
Between the first pressure chamber communicating with the first flow path portion, the second pressure chamber communicating with the second flow path portion, and between the first pressure chamber and the second pressure chamber. An atmosphere release valve having a valve body serving as a movable partition wall and an atmosphere release port opened and closed by the valve body,
A surface portion of the first tube body on the second tube body side surrounds the first opening portion that opens to the first flow path portion and the periphery of the first opening portion. The protruding first frame-shaped part is provided integrally,
On the outer side of the second tubular body on the first tubular body side, there is a second frame-shaped portion connected to the first frame-shaped portion, and on the inner side of the second frame-shaped portion. A second opening formed and opened to the second flow path portion, and the atmosphere opening formed inside the second frame-shaped portion are integrally provided ;
The flow path is configured in a U-shape or a U-shape as a whole, and the flow direction of at least the portion on the opposite side of the first flow path portion from the first connection end and the second flow path portion. The flow direction of at least the portion opposite to the second connection end is opposite to the flow direction, and the surface portion of the first tubular body has a portion opposite to the at least first connection end. It is the outer surface of the tube wall that constitutes,
The valve body is disposed in a posture extending along the tube wall of the first tube body and the tube wall of the second tube body,
The distance between the tube wall of the first tube body that forms the portion opposite to the at least first connection end and the valve body is the first portion that forms the portion opposite to the at least second connection end. 2. A pressure relief device characterized in that the pressure relief device is smaller than a distance between a pipe wall of the pipe body and the valve body . The first opening portion opens to an outer surface portion of a tube wall constituting a flow path portion extending in parallel with the second tube body in the first tube body, and the first frame-shaped portion is The pressure release device according to claim 1, wherein the pressure release device has a rib shape protruding on the outer surface portion . Said first opening, said out of the tube wall constituting the first channel section, according to claim 1 or 2 closing plate of the valve body, characterized in that an opening at a position deviated from the abutting range The pressure release device according to 1. The atmosphere between at least a portion of the first flow path portion opposite to the first connection end and at least a portion of the second flow path portion opposite to the second connection end. 4. The air release path according to claim 1, further comprising an atmosphere open path that extends parallel to the first flow path portion and the second flow path portion and opens to the outside after exiting from the open port . The pressure release device according to one item . An on-off valve unit, further comprising: the pressure release device according to any one of claims 1 to 4 ; and an on-off valve that opens and closes the flow path.

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