JP2012180935A - Check valve, and hot water storing type hot water supplier using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a check valve of small type including a pressure relieving function, easily manufacturable at a low cost.SOLUTION: The check valve 100 having a pressure relieving function includes a valve element 30, which is installed slidably on a valve shell 1 furnished with a main passage 25 in communication with the primary side and secondary side and a valve seat 13, and a relief passage 35 from the secondary to the primary side and a relief valve element 50 which are provided in the check valve element, wherein the check valve element is energized from the secondary to the primary side by a first elastic member 40 to make valve closing, while the relief valve element is energized from the primary to the secondary side by a second elastic member 60 to make valve closing.

Description

  The present invention relates to a check valve having a pressure relaxation function that suppresses an abnormal pressure increase on the secondary side, and a hot water storage type water heater using the check valve.

  For check valves used in faucets, hot water supply pipes, water supply pipes, etc., in addition to the function of preventing the back flow of fluid, abnormal pressure increase is caused by a water hammer or fluid volume expansion on the secondary side of the check valve. Some of them have a pressure relaxation function that prevents the check valve itself or the flow path components arranged in the secondary flow path from being destroyed or failing.

  For example, in Patent Document 1, a sliding valve seat body arranged in a flow path is pressed to the secondary side by a spring arranged on the primary side of the sliding valve seat body, and the reverse arrangement arranged in the sliding valve seat body. The valve body is pressed from the secondary side to the primary side with a spring so that it can be seated on the valve seat in the sliding valve seat body. The check valve body is provided with a relief valve seat and seated on the relief valve seat. The relief valve element is released from the primary side to the secondary side by a spring, and the relief valve element moves after the sliding valve seat moves from the secondary side to the primary side as the secondary pressure increases. A check valve is described in which the pressure relief function is provided by being configured to be separated from the seat.

  In this check valve, the sliding valve seat moves from the secondary side to the primary side as the secondary side pressure increases, so the volume on the secondary side within the check valve increases and the secondary side increases. The pressure rise at Further, when the pressure on the secondary side further increases thereafter, the relief valve element opens and the water on the secondary side is discharged to the primary side, so that abnormal pressure increase on the secondary side is prevented.

JP-A-5-187567

  However, in the check valve described in Patent Document 1, the slide valve seat body is slid from the primary side to the secondary side by a spring disposed on the primary side of the slide valve seat body that houses the check valve body. Since a relatively wide space must be ensured inside so that the check valve can be moved, the length of the check valve increases and the check valve increases in size. As a result, when this check valve is incorporated in a faucet instrument, the faucet instrument tends to be large, and when it is arranged in a conduit, the length of the conduit tends to be long. In addition, since a total of three springs are used: a spring that presses the sliding valve seat, a spring that presses the check valve body, and a spring that presses the relief valve body, the manufacturing and assembly work becomes complicated and It is difficult to reduce costs.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to obtain a check valve that can easily manufacture a small-sized one having a pressure relaxation function at low cost, and a hot water storage type water heater using the same. To do.

  The check valve of the present invention is provided with a valve outer body in which a main flow path communicating with a primary side and a secondary side and a check valve seat is formed, and a valve outer body slidably provided. A check valve body that is formed in the inside and is energized from the secondary side to the primary side by the first elastic member and seats on the check valve seat to close the valve; A relief valve body provided in the passage and biased from the primary side to the secondary side by the second elastic member to close the escape passage is provided.

  The hot water supply apparatus of the present invention boils low temperature water supplied to a hot water storage tank through a water supply pipe into hot water using a heat source and stores the hot water in the hot water storage tank. The hot water storage tank to be supplied first is characterized in that the check valve of the present invention is provided in at least one of the pipes connected to the hot water storage tank.

  In the check valve of the present invention, the relief flow path is formed in the check valve body and the relief valve body is disposed in the relief flow path. Therefore, the check valve body is disposed on either the primary side or the secondary side of the check valve body. It is possible to provide a pressure relaxation function without disposing an elastic member such as a spring. For this reason, compared with the check valve of patent document 1 which arrange | positions a spring to the primary side rather than the sliding valve seat body which accommodated the check valve body, size reduction is easy to achieve. Moreover, since the number of parts is reduced as compared with the check valve of Patent Document 1, it is easy to manufacture at a low cost. Therefore, according to the present invention, a small check valve having a pressure relaxation function can be easily manufactured at low cost.

FIG. 1 is a sectional view schematically showing an example of the check valve of the present invention. 2 is a cross-sectional view schematically showing the position of each member when fluid flows from the primary side to the secondary side in the check valve shown in FIG. FIG. 3 is a cross-sectional view schematically showing a state during pressure relaxation in the check valve shown in FIG. FIG. 4 is a schematic view showing an example of a hot water storage type hot water supply apparatus of the present invention.

  Hereinafter, embodiments of the check valve and the hot water storage type hot water heater of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments described below.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view schematically showing an example of the check valve of the present invention, and FIG. 2 is a diagram of each member when fluid flows from the primary side to the secondary side in the check valve shown in FIG. FIG. 3 is a cross-sectional view schematically showing a state during pressure relaxation in the check valve shown in FIG. 1. The check valve 100 shown in these drawings has a pressure relaxation function, and includes a valve outer body 1, a check valve body 30, a first elastic member 40, a relief valve body 50, and a second elastic member 60. It has.

  The valve casing 1 includes a valve case 10 that has a cylindrical shape with both ends in the longitudinal direction released, and a first cap 20 that is fixed in the valve case 10. The primary side piping is connected to the fluid inflow side, and the secondary side piping is connected to the secondary side (fluid outflow side). The inner diameter of the valve case 10 is expanded in three stages from the primary side opening 11 to the secondary side opening 12, and the secondary side end in the primary side region where the inner diameter is the smallest is on the secondary side. A protruding annular check valve seat 13 is provided. Further, the secondary side end and the vicinity thereof in the region where the inner diameter is the second smallest are cap fixing portions 14 for fixing the first cap 20.

The first cap 20 is a disk-shaped member that is disposed in the valve case 10 and slidably holds the check valve body 30 and is fitted to the cap fixing portion 14 in a removable state. ing. The in the center of the first cap 20, a columnar boss portion 21 extending in the axial direction D _x in the valve case 10. are provided, the boss portion 21 in the boss portion 21 in the longitudinal direction A check valve body insertion hole 21a is provided therethrough. Further, around the boss portion 21, at least one fluid circulation hole 22 that allows fluid to flow from the primary side to the secondary side and from the secondary side to the primary side is provided. The fluid circulation hole 22 constitutes a main flow path 25 located between the check valve seat 13 in the valve case 10 and the secondary side end in the first cap 20. The main channel 25 communicates with the primary side and the secondary side when the check valve body 30 is opened.

  The check valve body 30 includes a columnar shaft portion 31 that is slidably inserted into the check valve body insertion hole 21a, a main body portion 32 provided in a region on the primary side of the shaft portion 31, A packing 33 attached to the primary end of the shaft portion 31 adjacent to the main body portion 32; a second cap 34 attached to the primary end of the shaft portion 31 on the primary side of the packing 33; The escape passage 35 is formed inside the shaft portion 31, and a constricted portion 35 a is provided in the middle of the escape passage 35.

  An outer peripheral groove 31a to which the packing 33 is attached is formed at the primary side end of the shaft portion 31, and a groove-like shape to which the second cap 34 is attached to the primary side from the outer peripheral groove 31a. A cap engaging portion 31b is formed. Moreover, the area | region used as the side surface of the primary side in the constriction part 35a among the internal peripheral surfaces of the axial part 31 is the seal surface 31c which the relief valve body 50 contact | adheres. The main body portion 32 is provided on the outer periphery of the shaft portion 31 and protrudes in a flange shape on the outer side in the radial direction of the shaft portion 31, and the first elastic member 40 is formed on the secondary side surface of the main body portion 32. An annular groove 32a for locking is formed. The outer diameter of the annular groove 32a is larger than the outer diameter of the boss portion 21 described above.

  The packing 33 has a disk shape and has a size capable of being in close contact with the check valve seat 13 over the entire circumference of the check valve seat 13 described above. The second cap 34 has, on the secondary side, an engaging portion 34a that can be engaged with the cap engaging portion 31b described above, and a boss portion 34b that can externally fit the second spring 60. The engaging portion 34a is engaged with the cap engaging portion 31b in a state where the communication passage 36 is formed between the end surface 31d on the primary side and is fixed to the shaft portion 31. For example, when the check valve 100 is used in a hot water storage type water heater, the channel diameter at the narrowed portion 35a of the escape channel 35 is set to approximately 0.5 to 2 mmφ.

  The check valve body 30 having the shaft portion 31, the main body portion 32, the packing 33, the second cap 34, and the escape passage 35 described above slides the shaft portion 31 into the check valve body insertion hole 21 a of the first cap 20. By being movably inserted, it is slidably provided in the valve shell 1 and is pressed and urged by the first elastic member 40 from the secondary side toward the primary side.

  For example, a spring such as a coil spring is used as the first elastic member 40, one end of which is locked to the check valve body 30, and the other end is locked to the primary side of the first cap 20. In the illustrated example, a coil spring is used as the first elastic member 40, and one end of the coil spring is externally fitted to the boss portion 21 and the other end is inserted into the annular groove 32a. Is arranged. The first elastic member 40 presses and biases the check valve body 30 from the secondary side toward the primary side, and the product of the pressure receiving area on the secondary side and the pressure on the secondary side in the check valve body 30. Is greater than the force represented by the product of the pressure-receiving area on the primary side and the pressure on the primary side of the check valve body 30. Next, the packing 33 is seated on the check valve seat 13 and the check valve body 30 is closed.

  The relief valve body 50 is made of a rubber material such as EPDM (ethylene / propylene / diene copolymer) or an elastic material. The relief valve body 50 is inserted into the relief flow path 35 from the primary side, and is pressed and urged from the primary side to the secondary side by the second elastic member 60 to be in close contact with the sealing surface 31c from the primary side. To do.

  For example, a spring such as a coil spring is used as the second elastic member 60, one end of which is locked to the primary side of the relief valve body 50, and the other end is locked to the secondary side of the second cap 34. . In the illustrated example, a coil spring is used as the second elastic member 60, and one end of the coil spring is externally fitted to the relief valve body 50, and the other end is externally fitted to the boss portion 34 b of the second cap 34. And disposed in the escape passage 35. The second elastic member 60 presses and biases the relief valve body 50 from the primary side toward the secondary side, and is expressed by the product of the primary pressure receiving area and the primary side pressure in the relief valve body 50. When the resultant force of the force and the urging force of the second elastic member 60 is larger than the force represented by the product of the secondary pressure receiving area and the secondary pressure in the relief valve body 50, the relief valve The body 50 is closed.

  The check valve 100 constituted by the above-described members is, for example, a pipe in a water heater, an interior of a faucet used for a water heater, a bathtub circulator, or the like, or a water pipe or hot water connected to the faucet. Used by being incorporated into a pipe or the like.

  As shown in FIG. 1, when the differential pressure between the primary side and the secondary side is 0 (zero), it is represented by the product of the pressure receiving area on the secondary side and the pressure on the secondary side in the check valve body 30. Since the resultant force of the force generated by the first elastic member 40 and the biasing force of the first elastic member 40 is larger than the force represented by the product of the primary pressure receiving area and the primary pressure in the check valve body 30, the check valve The body 30 closes. At this time, the resultant force of the force represented by the product of the primary pressure receiving area and the primary pressure in the relief valve body 50 and the urging force of the second elastic member 60 is a secondary force in the relief valve body 50. Since the pressure is greater than the force represented by the product of the pressure receiving area on the side and the pressure on the secondary side, the relief valve body 50 is also closed. Therefore, no fluid flows in any direction from the secondary side to the primary side and from the primary side to the secondary side.

  As shown in FIG. 2, the pressure on the primary side becomes higher than the pressure on the secondary side and a differential pressure is generated between the primary side and the secondary side. The force represented by the product of the pressure of the first elastic member 40 and the force represented by the product of the pressure-receiving area on the secondary side of the check valve body 30 and the pressure on the secondary side However, the check valve body 30 moves to the secondary side against the urging force of the first elastic member 40 and opens, although the relief valve body 50 remains closed. Therefore, as shown by an arrow A in the figure, the fluid flows from the primary side to the main flow path 25 and flows out to the secondary side. That is, the fluid that has flowed into the valve case 10 from the primary side opening 11 flows through the gaps between the check valve body 30 and the second cap 34 and the inner peripheral surface of the valve case 10, and is secondary from the fluid circulation hole 22. It reaches the side opening 12 and flows out from here to the secondary side.

  In the check valve body 30, the resultant force of the force expressed by the product of the pressure receiving area on the secondary side and the pressure on the secondary side and the urging force of the first elastic member 40 is the primary in the check valve body 30. When the pressure is greater than the force represented by the product of the pressure-receiving area on the side and the pressure on the primary side, the valve closes as shown in FIG. 1, but the pressure on the secondary side becomes higher than the pressure on the primary side. When the differential pressure between the secondary side and the primary side in the relief passage 35 exceeds a predetermined condition value, the relief valve body 50 is opened with the check valve body 30 closed as shown in FIG. . That is, the force represented by the product of the secondary pressure receiving area and the secondary pressure in the relief valve body 50 is the product of the primary pressure receiving area and the primary pressure in the relief valve body 50. When the resultant force and the urging force of the second elastic member 60 become larger, the check valve body 30 remains closed, but the relief valve body 50 becomes the urging force of the second elastic member 60. The valve moves to the primary side against the valve. Therefore, as indicated by an arrow B in the figure, the fluid that has flowed into the valve case 10 from the secondary opening 12 flows through the escape passage 35 and the communication passage 36 to reach the primary opening 11, from here Flows to the primary side.

  Accordingly, in the check valve 100, the flow passage cross-sectional area in the narrowed portion 35a is opened so that the pressure relief valve body 50 is opened when an abnormal pressure increase occurs due to a water hammer or fluid volume expansion on the secondary side. By appropriately selecting the elastic characteristics of the elastic member 60 and the amount of contraction of the second elastic member 60 at the time of attachment, the abnormal pressure on the secondary side can be released to the primary side. As a result, it is possible to prevent the check valve 100 itself and the flow path components provided in the flow path on the secondary side of the check valve 100 from being damaged or failing due to the abnormal pressure. it can. The above-mentioned condition values when the relief valve body 50 is opened include the check valve 100 itself and flow path components provided in the flow path on the secondary side of the check valve 100 due to abnormal pressure increase on the secondary side. Is appropriately selected according to the mechanical specification of the pipe line and the faucet device in which the check valve 100 is provided so that the check valve 100 is not broken or broken.

  For example, when the check valve 100 is provided in a hot water supply line or a water supply line in a hot water storage hot water heater connected to a water supply with a maximum water pressure of 0.75 MPa, the water pressure on the secondary side in the escape flow path 35 is The cross-sectional area of the flow path at the narrowed portion 35a is set so that the relief valve body 50 opens when the pressure difference between the secondary side and the primary side becomes about 0.75 MPa. The elastic characteristics of the elastic member 60 and the amount of contraction of the second elastic member 60 at the time of attachment can be selected.

  In the check valve 100, a shaft part 31 in which a relief flow path 35 is formed, a relief valve body 50 disposed in the relief flow path 35, a second cap 34 attached to the shaft part 31, and a second The elastic member 60 constitutes a pressure relaxation mechanism. Since it is not necessary to provide an elastic member or a sliding valve seat on either the primary side or the secondary side outside of the check valve body 30, the check valve 100 accommodates the check valve body. The reverse of Patent Document 1 in which a pressure relief mechanism is configured using a sliding valve seat body and a spring that is disposed on the primary side of the sliding valve seat body and biases the sliding valve seat body to the secondary side. Compared to a stop valve, it is easier to reduce the size. Moreover, since the number of parts is reduced as compared with the check valve of Patent Document 1, it is easy to manufacture at a low cost. Therefore, it is easy to manufacture a small check valve 100 at low cost. In addition, it is easy to reduce the amount of energy consumed for production and improve the production yield.

Embodiment 2. FIG.
FIG. 4 is a schematic view showing an example of a hot water storage type hot water supply apparatus of the present invention. A hot water storage type water heater 150 shown in the figure includes a hot water storage tank 110, a water supply pipe 120 that supplies low temperature water from a water source (not shown) such as a water supply to the hot water storage tank 110 from the lower part of the hot water storage tank 110, and a heat source. A heat pump unit 125 functioning as a heater, a boiling circulation line 130 that reaches the upper part of the hot water storage tank 110 from the lower part of the hot water storage tank 110 via the heat pump unit 125, and the hot water stored in the hot water storage tank 110 for a predetermined hot water supply destination And a hot water supply pipe 140 that leads to

  The hot water storage tank 110 stores low-temperature water supplied from the water supply pipe 120 and hot water boiled up by the heat pump unit 125, and is always kept full. During operation of the hot water storage type water heater 150, temperature stratification is formed in the hot water storage tank 110. The water supply pipe 120 is a pipe for supplying low-temperature water from a water source to the hot water storage tank 110 as described above. The first water supply pipe section 120a having one end connected to the lower part of the hot water storage tank 110 and the first water supply It has the 2nd water supply pipe part 120b which branches from the pipe part 120a and guides said low-temperature water to the mixing valve 141 mentioned later.

  The heat pump unit 125 includes a refrigeration cycle system using a refrigerant such as carbon dioxide, and boiles water into hot water by a heat exchanger in the refrigeration cycle system. The boiling circulation pipe 130 takes the low temperature water from the lower part of the hot water storage tank 110 and guides the low temperature water to the heat exchanger, and the hot water boiled by the heat exchanger is stored in the hot water storage tank. A return pipe 130b returning from the upper part of 110 to the hot water storage tank 110 and a circulation pump (not shown) are provided.

  The hot water supply pipe 140 is a pipe that guides the hot water stored in the hot water storage tank 110 to a predetermined hot water supply destination. The hot water supply pipe 140a, the mixed hot water supply pipe 140b, the mixing valve 141, and the check valve 143 are connected to each other. Have. The hot water supply pipe 140a connects the upper part of the hot water storage tank 110 and the mixing valve 141, and the mixed hot water supply pipe 140b connects the mixing valve 141 and the hot water supply destination. The check valve 143 is provided on the downstream side of the mixing valve 141, and the check valve 143 has the same configuration as the check valve of the present invention, for example, the check valve 100 shown in FIGS. 1 to 3. Used.

  The mixing valve whose opening degree is adjusted by a control unit (not shown) so that the hot water flowing into the hot water supply pipe unit 140a from the upper part of the hot water storage tank 110 becomes a hot water supply temperature set by a user with a remote controller (not shown). In 141, it is mixed with the low-temperature water from the second water supply pipe section 120b, and then flows into the mixed hot water supply pipe section 140b to be supplied to a predetermined hot water supply destination. In the illustrated example, one faucet 160 is shown as the hot water supply destination. Although not shown in FIG. 4, the hot water storage tank 110, the mixing valve 141, and the check valve 143 are housed in the unit case, and the water supply line 120, the boiling circulation line 130, and the hot water supply pipe In each of the paths 140, a part of the section is accommodated in the unit case, and the remaining section extends outside the unit case.

  In the hot water storage type hot water heater 150 configured as described above, since the check valve 143 is provided in the mixed hot water supply pipe portion 140b, a water hammer is generated when the user suddenly opens and closes the faucet 160. Even if abnormal pressure increase occurs on the secondary side of the check valve 143, or volume expansion occurs due to water freezing at the faucet 160 and its vicinity, abnormal pressure increase occurs on the secondary side of the check valve 143. Abnormal pressure generated on the secondary side of the check valve 143 is released to the primary side (mixing valve 141 side) of the check valve 143. For this reason, the check valve 143 itself, the section downstream from the check valve 143 in the mixed hot water supply pipe 140b, and the faucet 160 are prevented from being broken or broken by the abnormal pressure.

  Further, the check valve 143 is included in the check valve of the present invention, and the check valve of the present invention is easy to downsize and easy to manufacture at low cost as described in the first embodiment. In the hot water storage type water heater 150, it is easy to reduce the size of the unit case described above and to reduce the manufacturing cost.

  As mentioned above, although the non-return valve and the hot water storage type water heater of the present invention have been described with reference to the embodiment, as described above, the present invention is not limited to the above embodiment. The check valve of the present invention is provided with a relief flow path in the check valve body, the relief valve body is disposed in the relief flow path, and an elastic member that urges the check valve body and a bias valve body Basically, any elastic member may be used as long as it is disposed between the primary side end and the secondary side end of the check valve body, and the configuration thereof can be appropriately changed. For example, if the fixing portion for fixing the primary side end of the second elastic member to the check valve body is formed at the primary side end of the shaft portion of the check valve body, the second cap may be omitted. Is possible. When the second cap is used, a through-hole extending from the primary side to the secondary side is formed in the second cap, and the above-described through-hole is used as a part or all of the communication path that connects the escape flow path and the main flow path. It can also be used.

  In addition, the hot water storage type hot water supply apparatus of the present invention is not limited as long as the check valve of the present invention is provided in at least one of the pipes connected to the hot water storage tank, and the configuration other than the check valve is appropriately selected. Is possible. For example, as a heat source device for boiling water into hot water, a heater disposed in a hot water storage tank can be used instead of the heat pump unit. Also, a heat exchanger that uses hot water in the hot water storage tank as a heat source is provided, and the function of reheating the hot water of the hot water type floor heating device is added by using the heat exchanger to retreat the bath water in the bathtub. You can also. Of course, the location where the check valve is provided can also be selected as appropriate, and the forward water supply pipe, return pipe, first water supply pipe part in the water supply pipe line, second water supply pipe part, hot water supply pipe line can be selected. A check valve may be provided in the hot water supply pipe section. The check valve and the hot water storage type water heater of the present invention can be variously modified, decorated, combined and the like in addition to the above.

  The check valve of the present invention can be provided in pipelines for various applications in which it is desired to suppress each of the reverse flow of fluid from the secondary side to the primary side and abnormal pressure increase on the secondary side. The hot water storage type water heater can be used as a hot water heater for home use or business use.

DESCRIPTION OF SYMBOLS 1 Valve outer body 10 Valve case 11 Primary side opening part 12 Secondary side opening part 13 Check valve seat 14 Cap fixing | fixed part 20 1st cap 21 Boss part 21a Check valve body insertion hole 22 Fluid flow hole 25 Main flow path 30 Reverse Stop valve body 31 Shaft section 32 Body section 33 Packing 34 Second cap 35 Escape flow path 35a Narrow section 36 Communication path 40 First elastic member 50 Relief valve body 60 Second elastic member 100 Check valve 110 Hot water storage tank 120 Water supply Line 125 Heat pump unit 130 Boiling circulation line 140 Hot water supply line 143 Check valve 150 Hot water storage type water heater 160 Faucet

Claims (3)

A valve outer body formed with a main flow path communicating with the primary side and the secondary side and a check valve seat;
The valve shell is slidably provided by a shaft provided in a direction substantially parallel to the flow, and is urged from the secondary side to the primary side by the first elastic member to be seated on the check valve seat. A check valve body that closes and
A relief passage formed inside the shaft portion in parallel with the sliding direction of the check valve body and communicating the primary side and the secondary side of the check valve body;
A relief valve body provided in the relief flow path and biased from the primary side to the secondary side by a second elastic member to close the relief flow path,
The check valve according to claim 1, wherein an end portion on the secondary side of the escape passage is opened in parallel with the sliding direction. A hot water storage tank that supplies low-temperature water supplied to a hot water storage tank through a water supply pipe to hot water using a heat source device, stores the hot water in the hot water storage tank, and supplies the hot water stored in the hot water storage tank to a desired hot water supply destination through a hot water supply pipe. There,
The hot water storage type hot water supply machine according to claim 1, wherein the check valve according to claim 1 is provided in at least one of the pipes connected to the hot water storage tank.   3. The heat source unit according to claim 2, wherein the heat source unit is a heat pump unit that takes out hot water from the hot water storage tank through a circulation pipe and heats the hot water to return the hot water heated to the hot water storage tank through the circulation pipe. Hot water storage water heater.

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