JP2018097930A - Water flow switch and hot water device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water flow switch with good assembly performance.SOLUTION: A water flow switch according to an embodiment of the present invention includes a case and a flapper. The case includes an inlet port, an outlet port, a case main body, and a lid body. The hot water flows in from the inlet port. The hot water flows out from the outlet port. A flow path is provided inside the case. The flow path is defined by the case main body and the lid body. The flow path is connected to the inlet port and the outlet port. The hot water flows in the flow path. The flapper includes a shaft and a flapper main body. The flapper main body is provided with a shaft hole. The shaft is inserted into the shaft hole. The flapper main body is rotatably supported within the flow path in a direction from the inlet port to the outlet port with the shaft as the center. The lid body includes a shaft fixing part. The shaft fixing part is provided on a surface of the case main body side of the lid body. The shaft is fixed to the shaft fixing part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a water flow switch and a hot water device.

  Conventionally, the water flow switch described in Japanese Utility Model Publication No. 7-28657 (Patent Document 1), the water flow switch described in JP-A-8-298056 (Patent Document 2), and Japanese Patent No. 4165857 (Patent Document 3). The described water flow switches are known.

  The water flow switch described in Patent Literature 1 includes a main body, a cover plate, a swing piece, a permanent magnet, a bracket, a shaft, and a reed switch. The main body has an inlet portion and an outlet portion. Hot water to be detected flows in from the inlet and flows out from the outlet. A flow path connected to the inlet and the outlet is provided inside the main body. The main body is provided with an opening on the side facing the inlet portion across the flow path. The lid plate is attached to the main body so as to close the opening.

  A permanent magnet is attached to the swing piece. A shaft is passed through a hole provided in the bracket. A shaft is also passed through a hole provided in the swing piece. Thereby, the rocking | fluctuation piece can be rotated centering on an axis | shaft. The bracket is attached to the flow path. As the swing piece rotates with hot water flowing from the inlet, the permanent magnet and the reed switch approach each other. A reed switch detects the presence or absence of water flow by detecting a magnetic field change by a permanent magnet.

  The water flow switch described in Patent Document 2 includes a frame, a seal plate, a swing plate, a magnetic material, a pin, a swing plate support plate, and a reed switch. The frame has an inlet portion and an outlet portion. Hot water to be detected flows in from the inlet and flows out from the outlet. A hollow portion connected to the inlet portion and the outlet portion is provided inside the frame. The frame is provided with an opening on the side facing the inlet portion across the hollow portion. The seal plate is attached to the frame so as to close the opening.

  The magnetic material is attached to the swing plate. The pin is passed through a pin hole provided in the swing plate support plate and a pin hole provided in the swing plate. Thereby, the swing plate can be rotated around the pin. The swing plate support plate is attached to the hollow portion. The magnetic material and the reed switch approach each other when the swing plate is rotated by hot water flowing from the inlet. A reed switch detects the presence or absence of water flow by detecting a magnetic field change caused by a magnetic material.

  The water flow switch described in Patent Literature 3 includes a main body, a lid, a detection piece, a support member, a magnet, and a sensor. The main body has an inlet and an outlet. Hot water to be detected flows in from the inlet and flows out from the outlet. A detection chamber connected to the inlet and the outlet is provided inside the main body. The main body is provided with an opening. The lid is attached to the main body so as to close the opening. The support member is bent into a substantially U-shape. A part of the support member serves as a rotating shaft. The rotation shaft is passed through a hole provided in the detection piece. Thereby, the detection piece can be rotated around the rotation axis. The support member is disposed in the detection chamber.

  The magnet and the sensor approach each other when the detection piece is rotated by hot water flowing from the inlet. A sensor detects the presence or absence of water flow by detecting a magnetic field change by a magnet.

Japanese Utility Model Publication No. 7-28657 JP-A-8-298056 Japanese Patent No. 4165872

  The water flow switch described in Patent Document 1 is assembled by disposing a bracket in a state where the shaft and the swing piece are assembled in the flow path from the opening of the main body. The shaft is only passed through a hole provided in the bracket and the swing piece. For this reason, when the bracket is arranged in the flow path, the shaft may fall out of the holes provided in the bracket and the swing piece.

  Similarly, in the water flow switch described in Patent Document 2, since the pin is merely passed through the pin hole provided in the swing plate and the swing plate support plate, the swing plate support plate is disposed in the hollow portion. At this time, the pin may fall out of the pin hole.

  Similarly, also in the water flow switch described in Patent Document 3, the rotation shaft is merely passed through a hole provided in the detection piece, and therefore, when the support member is disposed in the detection chamber, the rotation shaft May fall out of the hole.

  That is, the water flow switch described in Patent Document 1, the water flow switch described in Patent Document 2, and the water flow switch described in Patent Document 3 have room for improvement in assemblability.

  The present invention has been made in view of the above problems of the prior art. Specifically, the present invention provides a water flow switch and a hot water device with good assembly.

  A water flow switch according to one embodiment of the present invention includes a case and a flapper. The case includes an inflow port, an outflow port, a case body, and a lid. Hot water flows from the inlet. Hot water flows out from the outlet. A flow path is provided inside the case. The flow path is defined by a case body and a lid. The flow path is connected to the inlet and the outlet. Hot water flows through the flow path.

  The flapper has a shaft and a flapper body. The flapper body is provided with a shaft hole. A shaft is inserted into the shaft hole. The flapper body is supported in the flow path so as to be rotatable in a direction from the inlet to the outlet with the shaft as the center. The lid has a shaft fixing portion. The shaft fixing portion is provided on the surface of the lid on the case body side. A shaft is fixed to the shaft fixing portion. The water flow switch according to one aspect of the present invention can improve assemblability.

  In the water flow switch, the lid may include a pedestal. The pedestal is disposed on the inlet side of the shaft fixing portion on the surface of the case main body. The pedestal supports the flapper body in a state where hot water is not flowing in the flow path. In this case, the flapper body where the water flow switch is turned off can be positioned by the pedestal.

  In the water flow switch described above, the angle formed by the extending direction of the flapper body and the extending direction of the inflow port may be 90 ° ± 10 ° when hot water is not flowing through the flow path. In this case, detection can be performed even if the flow rate of hot water to be detected is small.

  In the water flow switch described above, the lid may have a guide wall. The guide wall is disposed between the inlet and the shaft on the surface on the case body side, and extends so as to intersect the direction from the inlet to the shaft. In this case, it is possible to suppress clogging of dust contained in hot water to be detected between the shaft and the flapper body.

  In the water flow switch, the guide wall may extend in a direction toward the outlet. In this case, the dust contained in the hot water to be detected can be easily discharged from the outlet.

  The hot water apparatus which concerns on 1 aspect of this invention is equipped with said water flow switch and a circulation flow path. The water flow switch is disposed on the circulation channel. According to the hot water device according to one aspect of the present invention, the assembly of the water flow switch can be improved.

  According to the water flow switch concerning one mode of the present invention, the assembling property of the water flow switch can be improved. According to the hot water device according to one aspect of the present invention, the assembly of the water flow switch can be improved.

It is a top view of a water flow switch concerning an embodiment. It is a side view of the water flow switch concerning an embodiment. It is a disassembled perspective view of a cover body and a flapper. It is sectional drawing in IV-IV of FIG. It is a schematic diagram which shows the operation | movement of the water flow switch which concerns on embodiment. It is a schematic diagram which shows the effect | action of a guide plate. It is a schematic diagram of the hot water apparatus which concerns on embodiment.

  Hereinafter, embodiments will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals. Moreover, you may combine arbitrarily at least one part of embodiment described below. Furthermore, dimensional relationships such as length, width, thickness, and depth are changed as appropriate for clarity of the drawings, and do not represent actual dimensional relationships.

(Configuration of water flow switch according to the embodiment)
Below, the structure of the water flow switch which concerns on embodiment is demonstrated with reference to FIGS. As shown in FIG. 1 (in FIG. 1, the lid body 15 is omitted to clarify the internal structure of the water flow switch) to FIG. 4, the water flow switch according to the embodiment includes a case 1, A flapper 2 and a proximity switch 3 are provided.

  The case 1 has an inlet 11 and an outlet 12. A flow path 13 is provided inside the case 1. Hot water to be detected flows in from the inflow port 11. Hot water to be detected flows out from the outlet 12. The inflow port 11 and the outflow port 12 are hollow inside. The flow path 13 is connected to the inlet 11 and the outlet 12. That is, the hot water to be detected flowing in from the inflow port 11 flows through the flow path 13, and the hot water to be detected flowing in the flow path 13 flows out from the outlet 12.

  The case 1 has a case body 14 and a lid 15. The case body 14 is provided with a recess 14a. The case body 14 is recessed in the recess 14a. The recess 14a has a side wall surface 14b and a bottom surface 14c. The lid body 15 is attached to the case body 14 so as to face the bottom surface 14c (hereinafter, the surface of the lid body 15 on the case body 14 side is referred to as an inner side surface 15a). As a result, the case body 14 and the lid body 15 define the flow path 13. More specifically, the flow path 13 is defined by the side wall surface 14 b, the bottom surface 14 c, and the inner side surface 15 a of the lid body 15.

  The lid 15 includes a shaft fixing portion 15b, a pedestal 15c, and a guide plate 15d. The shaft fixing portion 15 b, the pedestal 15 c, and the guide plate 15 d are provided on the inner side surface 15 a of the lid body 15.

  The shaft fixing portion 15b has, for example, a cylindrical shape. The shaft fixing portion 15b may be formed integrally with the pedestal 15c. The shaft fixing portion 15b may be separated from the inner surface 15a at the end on the inner surface 15a side. A hole 15ba is formed in the shaft fixing portion 15b. The hole 15ba extends in a direction intersecting the inner side surface 15a in the shaft fixing portion 15b. Preferably, the hole 15ba extends in the shaft fixing portion 15b so as to be orthogonal to the inner side surface 15a. The shaft 22 is fixed to the lid 15 by being fitted into the hole 15ba.

  The pedestal 15c is disposed closer to the inflow port 11 than the shaft fixing portion 15b. The pedestal 15 c extends so as to intersect the extending direction of the inflow port 11. The pedestal 15c also extends in the direction toward the bottom surface 14c. Thereby, the base 15c supports the flapper main body 21 in a state where hot water to be detected does not flow in the flow path 13.

  The flapper body 21 extends so as to form an angle θ with the extending direction of the inflow port 11 in a state where it is supported by the base 15c. Preferably, the angle θ is 90 ° ± 10 °. More specifically, the third portion 21d of the flapper body 21 extends at an angle θ with the extending direction of the inflow port 11 in a state where the flapper body 21 is supported by the base 15c.

  The guide plate 15 d is disposed between the inflow port 11 and the shaft 22. Specifically, it is arranged between the center C of the inlet 11 on the side connected to the flow path 13 and the shaft 22. The guide plate 15d extends so as to intersect the direction from the inflow port 11 toward the shaft 22. Specifically, it extends so as to intersect the direction from the center C of the inflow port 11 on the side connected to the flow path 13 toward the shaft 22.

  The guide plate 15 d may extend in the direction toward the outlet 12. For example, the guide plate 15d may extend so as to intersect with a portion where the outlet 12 and the flow path 13 are connected. The guide plate 15d also extends in the direction toward the bottom surface 14c. The guide plate 15d may be formed integrally with the pedestal 15c.

  The flapper 2 has a flapper main body 21, a shaft 22 and a magnet 23. The flapper main body 21 has a first portion 21b, a second portion 21c, a third portion 21d, and a fourth portion 21e.

  A shaft hole 21a is provided in the first portion 21b and the second portion 21c. The first portion 21 b and the second portion 21 c are bent from the third portion 21 d so as to intersect the extending direction of the shaft 22. The first portion 21b and the second portion 21c are arranged to face each other. The distance between the first portion 21b and the second portion 21c is wider than the length of the shaft fixing portion 15b.

  The fourth portion 21e is bent from the third portion 21d. The fourth portion 21e is bent toward the inlet 11 side. The third portion 21d and the fourth portion 21e receive water pressure from hot water that is a detection target flowing in the flow path 13.

  The shaft 22 is passed through the shaft hole 21a. As described above, the shaft 22 is fixed to the lid body 15 by the shaft fixing portion 15b. Accordingly, the flapper body 21 is rotatably supported by the lid body 15 around the shaft 22 in the flow path 13. The flapper body 21 is rotated in a direction from the inlet 11 toward the outlet 12 by hot water to be detected flowing through the flow path 13.

  The magnet 23 is attached to the flapper main body 21. Specifically, the magnet 23 is attached to the third portion 21d. The proximity switch 3 is attached to the outside of the case 1. The proximity switch 3 is disposed at a position where the distance from the magnet 23 is closest when the flapper body 21 is most rotated to the outlet 12 side. The proximity switch 3 detects a magnetic field change caused by the magnet 23. The proximity switch 3 is, for example, a magnetic sensor.

  Below, operation | movement of the water flow switch which concerns on embodiment is demonstrated with reference to FIG. As shown in FIG. 5A, when hot water to be detected does not flow from the inlet 11, water pressure from the hot water does not act on the flapper body 21. Therefore, the flapper main body 21 is in a state of being rotated to the most inlet 11 side. As a result, the distance between the magnet 23 and the proximity switch 3 is increased, and the water flow switch is turned off.

  On the other hand, as shown in FIG. 5B, when hot water to be detected flows in from the inlet 11 (in FIG. 5B, the flow of hot water to be detected is indicated by a solid line arrow. ), The water pressure from the hot water acts on the flapper body 21. Therefore, the flapper main body 21 rotates to the outlet 12 side by the water pressure from the hot water. As a result, the distance between the magnet 23 and the proximity switch 3 approaches, and the water flow switch is turned on.

  Below, the assembly method of the water flow switch which concerns on embodiment is demonstrated. In the assembly of the water flow switch according to the embodiment, first, the flapper body 21 includes the first portion 21b and the second portion 21c sandwiching the shaft fixing portion 15b, and the position of the shaft hole 21a matches the position of the hole 15ba. To be arranged. Second, the shaft 22 is inserted into the shaft hole 21a and the hole 15ba. Thereby, the flapper 2 is attached to the lid 15.

  Thirdly, the lid 15 is attached to the case body 14 in a state where the flapper 2 is attached to the lid 15. Thereby, the flapper 2 is arranged in the flow path 13. After the lid 15 is attached to the case main body 14, the gap between the other end of the shaft 22 and the bottom surface 14c of the case main body 14 is small, so that the shaft 22 is unlikely to come off from the shaft fixing portion 15b.

  Below, the effect of the water flow switch which concerns on embodiment is demonstrated. As described above, in the water flow switch according to the embodiment, the shaft 22 is fixed to the lid body 15 by being fitted to the hole 15ba provided in the shaft fixing portion 15b. Therefore, in the water flow switch according to the embodiment, even if the lid body 15 is moved when the flapper 2 is assembled in the flow path 13, the shaft 22 is not easily detached from the lid body 15. Therefore, according to the water flow switch which concerns on embodiment, the assembly property of a water flow switch can be improved.

  As described above, the pedestal 15c supports the flapper body 21 in a state where hot water to be detected is not flowing. When hot water to be detected is not flowing, the water flow switch according to the embodiment is in an off state. Therefore, when the water flow switch according to the embodiment includes the pedestal 15c, the position of the flapper main body 21 where the water flow switch is turned off can be defined.

  When the angle θ is 90 ° ± 10 °, when the hot water to be detected starts flowing through the flow path 13, the water pressure from the hot water acts on the flapper body 21 at an angle close to a right angle. In this case, the force that the hot water tries to rotate the flapper body 21 toward the outlet 12 becomes relatively large.

  Therefore, when the angle θ is 90 ° ± 10 °, the water flow switch according to the embodiment can detect the presence or absence of water flow even if the flow rate of hot water to be detected is small.

  There is a case where dust (hair, sand, etc.) is mixed into the hot water to be detected. When the shaft 22 is exposed with respect to the inflow port 11, there is a possibility that the dust is clogged between the shaft 22 and the flapper main body 21. As a result, even when hot water to be detected does not flow in the flow path 13, the flapper body 21 becomes difficult to rotate toward the inlet 11, and the water flow switch may be kept on. In particular, when the water flow switch is downsized, since the distance between the shaft 22 and the inlet 11 approaches, the tendency becomes more prominent.

  As described above, the guide plate 15d is disposed between the inlet 11 and the shaft 22 and extends in a direction intersecting the direction from the inlet 11 toward the shaft 22. Therefore, when the water flow switch according to the embodiment includes the guide plate 15d, the shaft 22 is not exposed to the inflow port 11.

  That is, the dust mixed in the hot and cold water to be detected is, as shown by the solid line arrow in FIG. 6 (the flapper 2 is not shown in FIG. 6), the shaft 22 and the flapper main body 21. Before reaching between the guide plates 15d. Therefore, when the water flow switch according to the embodiment has the guide plate 15d, even if dust is mixed in the hot water to be detected, the dust is clogged between the shaft 22 and the flapper body 21. Hateful.

  When the guide plate 15d extends toward the outlet 12, as shown by the solid line arrow in FIG. 6, dust contained in the hot water to be detected comes into contact with the guide plate 15d and flows. The direction is changed toward the exit 12. Therefore, in this case, it becomes easier to discharge the dust contained in the hot water to be detected from the water flow switch.

(Hot water device according to the embodiment)
Below, the structure of the hot water apparatus 100 which concerns on embodiment with reference to FIG. 7 is demonstrated. As shown in FIG. 7, the hot water device 100 according to the embodiment includes a circulation flow path 4, a water flow switch 5, a heat exchanger 6, a burner 7, and a pump P.

  The water flow switch 5 and the heat exchanger 6 are disposed on the circulation channel 4. The water flow switch 5 is a water flow switch according to the above embodiment. The burner 7 is disposed in the vicinity of the heat exchanger 6. The burner 7 is controlled so as to emit combustion gas when the water flow switch 5 is in the on state and not to emit combustion gas when the water flow switch 5 is in the off state. The pump P is disposed on the circulation channel 4 and circulates hot water in the bathtub 8 through the circulation channel 4.

  The circulation channel 4 is a channel for heating and circulating the hot water in the bathtub 8 so as to return to the bathtub 8 again. The circulation channel 4 includes a first pipe 41, a second pipe 42, and a third pipe 43.

  The first pipe 41 is connected to the suction port of the circulation adapter 81 of the bathtub 8 at one end. The first pipe 41 is connected to the inlet 11 of the water flow switch 5 at the other end. The second pipe 42 is connected to the outlet 12 of the water flow switch 5 at one end. The second pipe 42 is connected to one end of the heat exchanger 6 at the other end. The third pipe 43 is connected to the other end of the heat exchanger 6 at one end. The third pipe 43 is connected to the discharge port of the circulation adapter 81 of the bathtub 8 at the other end.

  Below, operation | movement of the hot water apparatus which concerns on embodiment is demonstrated. When the hot water apparatus according to the embodiment performs the reheating operation, the hot water in the bathtub 8 flows through the inlet of the circulation adapter 81, the first pipe 41, and the inlet 11 of the water flow switch 5. It flows through the road 13. When this hot water is flowing, the magnet 23 and the proximity switch 3 approach each other as the flapper body 21 rotates toward the outlet 12 due to the hot water pressure. That is, at this time, the water flow switch 5 is turned on. As a result, the burner 7 emits combustion gas, and the heat exchanger 6 exchanges heat between the hot water and the combustion gas, whereby the hot water in the bathtub 8 flowing through the circulation channel 4 is heated.

  On the other hand, when the hot water in the bathtub 8 does not flow through the circulation channel 4 (that is, when this hot water does not flow through the channel 13 in the water flow switch 5), the flapper body 21 does not receive water pressure from this hot water. Therefore, the flapper body 21 is positioned on the inlet 11 side, and the water flow switch 5 is turned off. As a result, the burner 7 does not generate combustion gas and the heat exchanger 6 is prevented from being burned.

  As described above, the hot water device 100 according to the embodiment includes the water flow switch according to the above embodiment. Therefore, according to the hot water device 100 according to the embodiment, the assemblability of the water flow switch 5 included in the hot water device 100 can be improved.

  It should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is shown not by the above-described embodiment but by the scope of claims, and is intended to include meanings equivalent to the scope of claims and all modifications within the scope.

  DESCRIPTION OF SYMBOLS 1 Case, 11 Inflow port, 12 Outflow port, 13 Flow path, 14 Case main body, 14a Recessed part, 14b Side wall surface, 14c Bottom surface, 15 Cover body, 15a Inner side surface, 15b Shaft fixing | fixed part, 15ba Hole, 15c Base, 15d Guide Plate, 2 flapper, 21 flapper body, 21a shaft hole, 21b first part, 21c second part, 21d third part, 21e fourth part, 22 shaft, 23 magnet, 3 proximity switch, 4 circulation flow path, 41st 1 piping, 42 2nd piping, 43 3rd piping, 5 water flow switch, 6 heat exchanger, 7 burner, 8 bathtub, 81 circulation adapter, 100 hot water apparatus P pump, θ angle.

Claims (6)

An inlet through which hot water flows, an outlet through which the hot water flows out, a case main body, and a lid attached to the case main body, defined by the case main body and the lid, A case connected to the outlet and provided with a flow path through which the hot water flows;
A flapper having a shaft and a flapper body provided with a shaft hole into which the shaft is inserted and supported in the flow path so as to be rotatable about the shaft in a direction from the inlet to the outlet. And
The lid is a water flow switch including a shaft fixing portion that is provided on a surface on the case body side and to which the shaft is fixed.   The lid body has a pedestal that supports the flapper body in a state where the lid body is disposed on the inlet side of the shaft fixing portion on the surface of the case body side and the hot water does not flow through the flow path. The water flow switch according to claim 1.   3. The water flow switch according to claim 2, wherein an angle formed by an extending direction of the flapper body and an extending direction of the inflow port is 90 ° ± 10 ° in a state where the hot water does not flow through the flow path. .   The lid includes a guide wall disposed between the inflow port and the shaft on a surface on the case body side and extending so as to intersect a direction from the inflow port toward the shaft. Item 4. A water flow switch according to item 1.   The water flow switch according to claim 4, wherein the guide wall extends in a direction toward the outlet. A circulation channel;
A hot-water apparatus provided with the said water flow switch of any one of Claims 1-5 arrange | positioned on the said circulation flow path.

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