JP3838423B2 - Fluid switch and heat source machine equipped with the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a fluid switch that is interposed in a fluid pipe and used to detect that a predetermined flow rate of fluid has occurred in the pipe, and a heat source device including the fluid switch.
[0002]
[Prior art]
  Conventionally, as this type of fluid switch, one using a flap type valve body having a predetermined weight balance is known. This is because the valve body is disposed so as to swing and rotate with respect to the flow path of the pipe, and when there is no flow of a predetermined flow rate, the flow path is positioned at a position where the flow path is substantially closed based on the weight of the valve body. When the flow of the fluid exceeds a predetermined flow rate, the valve body is sprung up by the flow, and an electric signal is output by the position conversion of the valve body to detect the fluid flow.
[0003]
  As an example of the flap type, a fluid switch 10 interposed in a recirculation circuit that connects a bathtub and a bath tub is shown in FIG. In the fluid switch 10, the valve body 40 swings and rotates around the axis of the shaft 42 with respect to the flow path 24 flowing from the bottom to the top so that the position of the valve body 40 can be mutually changed between the closed state and the flip-up state. When there is no flow at a predetermined flow rate, the valve body 40 collapses so as to block the flow path 24 by its own weight and enters a closed state (shown by a one-dot chain line). The valve body 40 is flipped up by the pressure of the pressure to enter an open state (state indicated by a solid line). In this example, the magnet 5 serving also as a weight adjustment is integrally attached to the valve body 40, and the magnetic field of the magnet 5 acts on the proximity sensor 6 when the valve body 40 is flipped up. It is possible to detect that a flow having a predetermined flow rate has been generated by an ON signal emitted from.
[0004]
  As shown in detail in FIG. 7, the valve body 40 in the above-described example includes a valve body main body 401 formed by bending a metal plate, a synthetic resin container 402 containing the magnet 5, and a caulking pin 403 made of, for example, copper, It is comprised from the shaft 42 used as the rotation spindle inserted in the said valve body main body 401. As shown in FIG. The valve body 40 is assembled by positioning the container 402 containing the magnet 5 with respect to the valve body main body 401, and in this state, the caulking pin 403 passes through the mounting hole 404 and the protruding end is caulked and fixed. . Then, the shaft 42 is inserted into the assembled valve body 40, and both ends of the shaft 42 are fitted into the concave receiving portions 301 of the lid 30, and the central portion of the shaft 42 is connected to the head of the screw 302. Tighten with a washer 303 to secure it so that it will not fall off. Thereafter, the lid body 30 to which the valve body 40 is attached is fixed to the housing body 20, whereby the assembly of the water flow switch 10 is completed. In this structure, it is necessary to form a notch 405 on the base end side of the valve body 40 so as not to interfere with the washer 303 and the screw 302 head.
[0005]
[Problems to be solved by the invention]
  However, in the fluid switch 10 described above, the valve element 40 itself has a relatively large number of fine projections such as corners and edges, and these are entangled with minute foreign matters contained in the fluid flowing through the flow path 24. On the other hand, there is a risk that it may accumulate and accumulate and increase the factors that hinder the position conversion, leading to malfunctions and malfunctions. In addition, in the rotation support portion of the valve body 40, a complicated shape portion is generated by the head portion of the screw 302 with the shaft 42 or the washer 303 or the notch portion 405 or the like facing the flow path 24. The risk of malfunctions and malfunctions due to entanglement of the above foreign matter and the like is further increased.
[0006]
  In particular, when the fluid switch 10 is installed in a recirculation circuit that connects the bathtub and the bath tub, the hot water in the bathtub, which is the fluid flowing in the recirculation circuit, is removed from the hair and towels that have fallen off due to bathing. Since fiber scraps or scales are included, the hair or the like is likely to be entangled when the protrusion or the complicated shape portion is present facing the flow path, and the position conversion malfunction is more likely to occur due to the entanglement.
[0007]
  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a fluid switch that eliminates the possibility of malfunction as much as possible and reduces the number of parts as much as possible. There is to do.
[0008]
(Delete)
[0009]
(Delete)
[0010]
(Delete)
[0011]
[Means for Solving the Problems]
  In order to achieve the above object, claim 1 is provided.In the invention according to the present invention, when the fluid is held in a swingable manner with respect to the housing and there is no predetermined flow of fluid in the flow path, the flow path is closed and the closed state is maintained. The following specific matters are provided for a fluid switch that includes a valve body that opens and detects a fluid flow by the opening and closing operation. That is, the valve body is formed by projecting the rotation support shaft on both sides and connecting the first member and the second member as the housing with the openings of the first member and the second member facing each other. In addition, a pair of concave groove portions in which the rotation support shafts on both sides can be inserted from the opposite direction with respect to one of the first member and the second member are integrally formed, and in the both groove portions with respect to the other. A pair of convex portions that can be fitted in from the opposite directions are integrally formed. AndThe pair of groove portions are opened to the first member side in the opposite direction and the side connecting the pair of groove portions perpendicular to the opposite direction, and the groove width of the rotation support shaft is Set to approximately the same size as the outer diameter,By connecting the first member and the second member to each other in a state where the rotation support shaft is inserted into the groove portion from the opposite direction, the protrusion portion is inserted into the groove portion. The groove is sealed so that the rotation support shaft does not fall out of the groove.And the rotation support shaft is sandwiched and supported between the convex portion and the groove portion.The configuration.
[0012]
  This claimInvention 1According to this, if the first member and the second member are connected to each other in a state where the rotation support shafts protruding from both sides of the valve body are inserted into the pair of groove portions, the pair of convex portions are formed by the connecting operation. The rotary support shaft is held so as not to fall off by being fitted in the groove portion. That is, the first member and the second memberTheIf assembled, the valve body can be held so as to be capable of swinging and rotating inside the housing simultaneously with the assembly. As a result, it is possible to easily assemble by realizing a significant reduction in assembly man-hours. In addition, since the groove portion and the convex portion for holding the rotation support shaft of the valve body are integrally formed on the inner surfaces of the first member and the second member constituting the housing, the internal space of the housing, that is, the fluid flow path It is possible to eliminate the presence of a complicated shape portion as in the prior art for the rotation support portion of the valve body in the space facing the surface, and to make the shape simple. As a result, even if the fluid flowing in the flow path contains fine foreign matter or hair, such as hair, it prevents as much as possible from sticking to or entangled with the rotation support part, It is possible to reliably avoid the occurrence of rotation failure due to them. For this reason, it becomes possible to prevent the occurrence of malfunctions and malfunctions directly and reliably.
[0013]
  In the above case, when the valve body and the rotation support shaft are assembled so as to be rotatable relative to each other, if the rotation support shaft sandwiched between the convex portion and the groove portion is tightly held, the valve body and the rotation support shaft are fixed in place. The valve body is supported so as to be able to swing and rotate with respect to the rotation support shaft. Further, when the valve body and the rotation support shaft are fixed to each other (relative rotation impossible state), if the rotation support shaft sandwiched between the convex portion and the groove portion is loosely held, the valve body and The entire rotation support shaft is supported so as to be relatively rotatable on the housing side.
[0014]
  Claims above1In, even if the valve body itself is formed of a metal plate, or even if the rotation support shaft is rotatable relative to the valve body and is held in a relatively non-rotatable state by the groove and the convex portion, As mentioned above, it is possible to directly prevent the occurrence of rotation failure by preventing entanglement in the rotation support part, but by adopting the following configuration, the assembly man-hours can be further reduced and operation failures and malfunctions can be achieved. Can be further ensured. That is, the valve body is formed by synthetic resin molding integrally with a shaft serving as a rotation support shaft, and the first member and the second member are connected to each other as the convex portion and the groove portion.Between the tip of the convex part and the bottom wall part of the groove part.The projecting end portions of the shaft are configured to be relatively rotatable (claims).2).
[0015]
  In this way, the valve body and the shaft can be formed integrally to reduce the number of man-hours for assembling the valve body and the shaft, and the valve body and the shaft are fixed so that they cannot rotate relative to each other. The rotation support shaft that is the protruding end portion is held by the groove portion and the convex portion so as to be relatively rotatable. For this reason, the rotational sliding portion is disposed at a position along the inner surface of the housing, and the shaft is loosely fitted to the valve body so that the rotational sliding portion can freely rotate. As compared with the case where it comes into direct contact with the motor, it is possible to prevent as much as possible the occurrence of a rotation failure due to tangling.
[0016]
  This claim2Furthermore, by adopting a configuration in which the valve body is integrally formed by synthetic resin molding in a state in which a weight adjusting weight for maintaining the valve body in a closed state is embedded (claim)3), The presence of protrusions and the like from the outer surface of the valve body itself can be eliminated, and the occurrence of malfunctions and the like due to the entanglement can be further prevented as much as possible.
[0017]
  Furthermore, the above-mentioned valve body is formed by synthetic resin molding.Claims 2 and 3In any one of the fluid switches, as the valve body, a configuration in which only both end portions of the shaft serving as the rotation support shaft are exposed to the outside and the shaft is embedded in substantially the entire length is added. (Claims)4). In this way, the presence of notches in the conventional case and the presence of minute gaps between the shaft and the valve body are eliminated, and the cause of the entanglement of fibrous foreign matters is removed as much as possible. Thus, the occurrence of malfunctions and the like can be avoided more reliably.
[0018]
  This claim4In the fluid switch in which the valve body is formed by the above synthetic resin molding in addition to the above case, the valve body can be subjected to antibacterial processing.5). For example, a valve body may be molded using a synthetic resin impregnated with an antibacterial agent, or an antibacterial film may be formed on the outer surface of the molded synthetic resin valve body. Thereby, the adhesion and propagation of bacteria on the valve body can be prevented.
[0019]
  Meanwhile, claims6In the invention according to claim 1, with respect to the above-mentioned pipe, the heat source machine for fluid heating provided with the pipe for flowing the fluid is claimed in claims 1 to claim.5The fluid switch described in any of the above was interposed.
[0020]
  This claim6Therefore, the fluid switch reliably prevents the occurrence of malfunctions and malfunctions, and when a fluid flow occurs in the pipe, it receives a detection signal from the fluid switch and generates the flow on the heat source unit side. It can be detected reliably. For this reason, confirmation of each operation status of the heat source device and the devices constituting the heat source device, detection of occurrence of an abnormal operation, control of starting the operation of the above devices based on the occurrence of fluid flow, etc. can be reliably performed. It becomes possible to make it a heat source machine.
[0021]
  Examples of such a “heat source device” include a bath tub, a bath tub with a hot water supply that can be filled with water, or a hot water heater that heats by circulating hot water. It is preferably applied to a heat source machine in which the fluid is forcibly circulated by a pump or the like in which the fluid switch is used to detect the occurrence of the forced circulation flow of the fluid.
[0022]
(Delete)
[0023]
(Delete)
[0024]
【The invention's effect】
  As described above, claims 1 to 5.According to any one of the fluid switches, the rotation support portion structure of the valve body in the fluid switch can be made into a simple shape by eliminating the existence of a complicated shape portion as in the past. The thing which can prevent reliably generation | occurrence | production of the malfunctioning malfunction, malfunctioning, etc. which originates can be provided. In addition, the assembly of the rotation support portion structure can be completed at the same time as the assembly of the first member and the second member, and it is easy to realize a significant reduction compared to the conventional assembly man-hours. Assembly can be realized.
[0025]
  In particular, the claims2According to the above, since the valve body and the shaft are integrally formed, it is possible to reduce the man-hours for assembling the valve body and the shaft, and the rotation by the entanglement or the like in the rotation support portion of the shaft integrated with the valve body. Occurrence of malfunctions can be prevented as much as possible.
[0026]
  Claim3According to the claim2The valve body is integrally formed by synthetic resin molding with the weight for adjusting the weight embedded therein, thereby eliminating the presence of protrusions from the outer surface of the valve body itself and resulting from the above-described entanglement Occurrence of malfunctions and the like can be further prevented as much as possible.
[0027]
  Claim4According to the present invention, it is possible to eliminate as much as possible the cause of the entanglement of fibrous foreign matters by eliminating the presence of notches in the conventional case and the presence of minute gaps between the shaft and the valve body. As a result, it is possible to more reliably avoid the occurrence of malfunction or the like.
[0028]
  Claim5According to the above, it is possible to prevent the adhesion and propagation of bacteria as the valve body of the fluid switch interposed in the flow path.
[0029]
  Claims6According to the heat source machine, claims 1 to claim5By providing any of the fluid switches, it is possible to reliably prevent the occurrence of malfunctions and malfunctions, and when a fluid flow occurs in the piping, a detection signal from the fluid switch is received to generate the heat flow. It will be possible to detect reliably on the machine side. For this reason, as a heat source device such as a bath tub, confirmation of each operation status of the heat source device and the devices constituting the heat source device, detection of occurrence of abnormal operation, or operation of the above devices based on generation of fluid flow What can perform start control etc. reliably can be provided.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0031]
  FIG. 1 shows a longitudinal sectional view of a fluid switch 1 according to a first embodiment of the present invention. The fluid switch 1 is also referred to as a water flow switch. In the figure, 2 is a housing body as a first member constituting the housing, 3 is a lid body as a second member also constituting the housing, and 4 is a valve body. Reference numeral 5 denotes a magnet embedded in the valve body, and reference numeral 6 denotes a proximity sensor that receives the magnetic field of the magnet 5 and outputs an ON signal.
[0032]
  The housing body 2 includes an inlet 21 that opens downward, an outlet 22 that opens laterally at an upper position, and an opening 23 that opens laterally (right laterally in FIG. 1) at an upper and lower intermediate position. In addition, a passage 24 is formed between the inlet 21 and the outlet 22, and the fluid flows upward with respect to the passage 24. In addition, a through hole 25 is formed in the flow path 24 so that a fluid pressure is applied when a fluid flows to the valve body 4 in a closed state (indicated by a one-dot chain line in FIG. 1). In the vicinity of the upper position of 25, an abutting portion 26 with which the closed valve body 4 abuts is formed. The contact portion 26 maintains a small amount of communication between the inlet 21 and the outlet 22 without completely closing the through hole 25 even when the valve body 4 is closed. It is provided for this purpose.
[0033]
  The lid 3 is accommodated in an upper portion thereof so that the proximity sensor 6 is not dropped by, for example, a split pin 61, and an accommodation space 31 for accommodating the proximal end side of the valve body 4 is formed therein. The accommodation space 31 is opened sideways (left sideward in FIG. 1) with the same size as the opening 23, and the opening 32 is opposed to the opening 23 with a sealant 33 interposed therebetween. In this state, the housing 1 is assembled by connecting the lid 3 to the housing body 2 with screws 34. The above-described direction (the left-right direction in FIG. 1) is hereinafter referred to as the opposite direction.
[0034]
  As shown in FIG. 2, the valve body 4 includes a main body 41 having a U-shaped overall shape in a side view, and a magnet 5 embedded and fixed in a convex portion 41b on a bent portion with respect to a tip edge 41a. And a shaft 42 serving as a rotational support shaft embedded and fixed in the base end portion 41c, and these are integrally formed by synthetic resin molding. In this synthetic resin molding, the magnet 5 and the shaft 42 may be disposed as inserts at predetermined positions in the cavity of the mold, and the molten synthetic resin may be poured and cured. By this synthetic resin molding, the entire body 41 including the convex portion 41b and the distal end edge 41c is formed so as to have a smooth outer surface, and each end portion of the shaft extends from both sides of the base end portion 41c to the rotation support shaft 43, 43 (see also FIG. 3). 2 and 1, reference numeral 36 is a stopper formed integrally with the lid 3, and this stopper 36 has a convex portion 41 b when the valve body 4 is flipped upward. It comes to hit. By doing in this way, the noise suppression at the time of abutting is aimed at.
[0035]
  Returning to the description of the housing main body 2 and the lid 3 again, the inner side surfaces of both sides of the housing main body 2 are arranged in the opposite direction as shown in FIG. 3 (the vertical direction in FIG. 3 in FIG. 3). A pair of ridges 27 extending in the lateral direction and projecting from the opening 23 toward the lid 3 are formed. On the other hand, a pair of concave grooves 35, 35 extending in the opposite direction are formed on the inner side surfaces on both sides of the lid 3. As shown in FIG. 4A, each groove 35 has a pair of groove portions 35 perpendicular to the opposite direction and the side of the housing body 2 in the opposite direction (the left-right direction in FIG. 4). , 35 and the opposite side of the housing body 2 in the opposite direction is a U-shaped bottom wall portion 351.
[0036]
  Each of the groove portions 35 is set to a size substantially equal to the outer diameter although the groove width is larger than the outer diameter of the rotation support shaft 43 by a minute dimension. A convex portion 271 that can be fitted into the groove portion 35 is formed through the portion. Further, as shown in FIG. 4 (b), the convex portions 271 are fitted into the groove portions 35 by connecting the lid 3 to the housing body 2 with screws 34 (see FIG. 1), and the rotation support shaft 43. Is positioned so as to be relatively rotatable. Then, in the state where the above connection is completed, the convex portion is left in a state where a space having a gap larger than the outer diameter of the rotating support shaft 43 is left between the tip of the convex portion 271 and the bottom wall portion 351. 271 is fitted therein, thereby forming a rotation support portion that holds the rotation support shafts 43 and 43 in a relatively rotatable manner.
[0037]
  Reference numeral 29 in FIG. 1 denotes a temperature sensor such as a thermistor, and the temperature of the fluid flowing through the flow path 24 is detected by the temperature sensor 29.
[0038]
  In assembling the fluid switch 1 having the above configuration, the valve body 4 is first formed by synthetic resin molding, and the rotation support shafts 43 and 43 are inserted into the groove portions 35 and 35 (see FIG. 2) of the lid body 3. Then, in this inserted state, while inserting the valve body 4 into the flow path 24 from the opening 23 of the housing body 2 with the sealing material 33 temporarily attached, for example, positioning protrusions 37, 37 (see FIG. 2) is connected with a screw 34 so as to fit into a hole (not shown) on the housing body 2 side. Then, simultaneously with this connection, both convex portions 271 and 271 are fitted into the groove portions 35 and 35 so that the rotation support shafts 43 and 43 are positioned on the bottom wall portion 351 side of the groove portion and are held relatively rotatable. become. This completes the assembly.
[0039]
  When the fluid switch 1 is inserted in the middle of the piping, if there is no fluid flow or if the flow is a little less than a predetermined flow rate, the valve body 4 will fall down due to its own weight of the magnet 5 etc. On the other hand, when a flow exceeding a predetermined flow rate occurs, the valve body 4 oscillates by receiving the pressure of the fluid flow upward from the hole 25. The position is converted to the open state (the state indicated by the solid line in FIG. 1) by being flipped up by the rotation. In this open state, the magnetic field of the magnet 5 reaches the proximity sensor 6, and the proximity sensor 6 receives this magnetic field and outputs an ON signal. It is detected by this ON signal that a fluid flow exceeding a predetermined flow rate has occurred. When the flow of the fluid again becomes less than the predetermined flow rate, the valve body 4 falls down again and closes due to the swinging rotation opposite to the above due to the weight balance between the weight of the magnet 5 and the like and the pressure of the fluid. . That is, the tip edge 41a of the valve body 4 comes into contact with the contact portion 26 and becomes stationary. The valve body 4 is swung and rotated by the rotation support shafts 43 and 43 themselves rotating and sliding at the rotation support portions between the groove portions 35 and the convex portions 271.
[0040]
  In the case of such a fluid switch 1, the shaft 42 is not embedded and exposed in the valve body 4 itself on the proximal end side of the valve body 4 facing the flow path 24, and in addition, the rotation support shafts 43, 43 thereof. Is held by the rotation support portion on the inner surface of the lid 3, and the portion facing the flow path 24 is complicated as in the conventional fluid switch 10 (see FIG. 6) and its valve body 40 (see FIGS. 6 and 7). Since the shape portion does not exist, even if the fluid flowing through the flow path 24 contains fibrous foreign matter such as hair or towel scraps, the fibrous foreign matter is entangled or attached. It can be avoided as much as possible. In addition, since the valve body 4 itself is integrally formed by synthetic resin molding with the magnet 5 or the like embedded therein, the number of parts can be greatly reduced as compared with the conventional fluid switch. As described in the assembling procedure, the valve body 4 can be assembled in a freely swinging and rotating state by simply assembling the lid 3 to the housing body 2. Thereby, manufacture of a fluid switch can be performed easily.
[0041]
Second Embodiment
  FIG. 5 shows a bath tank 200 with a water heater as a heat source device according to the second embodiment of the present invention, and the bath tank 200 with a water heater has the fluid switch 1 of the first embodiment with respect to the recirculation circuit. It is an intervening thing.
[0042]
  Although FIG. 5 shows the bath tank 200 with a water heater as shown in FIG. 5, the present invention is not limited to this, and the fluid switch 1 is added to the bath tank with a water heater configured as a 2 cans and 2 circuits. Even if is applied, the same effect can be obtained.
[0043]
  The bath heater 200 with the water heater is a common for heating and heating the hot water supply circuit 7, the reheating circuit 8 for reheating the hot water in the bathtub 100, and both the hot water supply circuit 7 and the reheating circuit 8. A heat exchange can body 9 and a controller 10 for controlling each of these operation operations are provided.
[0044]
  The hot water supply circuit 7 heat-exchanges and heats the water introduced into the hot water supply side heat exchanger 72 from the incoming water pipe 71 connected to the water pipe by the combustion heat of the common combustion burner 73, and the heated hot water is discharged into the hot water pipe. Hot water is supplied to the hot water tap 75 at the downstream end through the passage 74.
[0045]
  The hot water supply operation control by the hot water supply circuit 7 is performed by the controller 10, and when the hot water tap 75 is opened and an incoming water flow rate exceeding the minimum operating flow rate is detected, the combustion burner 73 is combusted to heat the incoming water to a predetermined temperature. Thus, the hot water discharge pipe 74 is used to discharge the hot water.
[0046]
  The reheating circuit 8 includes a circulation path 81 as a pipe, a circulation pump 82, and a reheating side heat exchanger 83. The circulation path 81 includes a return pipe 81 a that returns hot water in the bathtub 100 to the heat exchanger 83, and a forward pipe 81 b that supplies hot water heated by the heat exchanger 83 to the bathtub 100. . In the reheating circuit 8, when the reheating switch of the remote controller 101 is turned on, the circulation pump 82 is operated by the controller 10 and the combustion burner 73 is combusted to perform reheating operation control. It has become. Accordingly, hot water in the bathtub 100 returned to the heat exchanger 83 through the return pipe 81a is reheated by the combustion heat of the combustion burner 73, and the heated hot water is again returned to the bathtub 100 through the forward pipe 81b. It is supplied and reheated for circulation heating.
[0047]
  During the reheating operation control, when hot water in the bathtub 100 is forced to flow to the heat exchanger 83 side through the return pipe 81 a by the operation of the circulation pump 82, the hot water in the bathtub 100 is interposed in the downstream position of the circulation pump 82. The valve body 4 (see FIG. 1) of the mounted fluid switch 1 receives the pressure of the hot water flow and changes the position from the closed state to the open state, whereby an ON signal is sent from the fluid switch 1 to the controller 10. Will be output. Then, the controller 10 receives the output of the ON signal and confirms (circulation determination) that the circulating flow is generated. After confirming the circulating flow by the circulation determination, the combustion operation of the combustion burner 73 is started. It is like that.
[0048]
  In FIG. 5, reference numeral 76 denotes a pouring pipe line. The pouring pipe line 76 drops hot water from the hot water supply circuit 7 into the bathtub 100 through the circulation path 81 and fills the bathtub 100 with water.
[0049]
  In the above-described bath with a water heater, the fluid switch 1 can reliably detect the fluid flow by preventing the occurrence of malfunction and malfunction as much as possible as described in the first embodiment. Therefore, it becomes possible to reliably perform the above-mentioned driving operation control.
[0050]
<Other embodiments>
  The present invention is not limited to the first and second embodiments described above, but includes other various embodiments. That is, in the fluid switch 1 in the first and second embodiments, the opening operation of the valve body 4 is detected by the combination of the magnet 5 and the proximity sensor 6 that outputs an ON signal by the magnetic field of the magnet 5. Thereby, the flow of the fluid is detected. However, the present invention is not limited to this. For example, the position change of the valve body 4 is detected by the rotation of the shaft 42, and the ON signal is output in response to the rotation of the shaft 42. You may comprise so that the flow of a fluid may be detected by arrange | positioning a sensor switch.
[0051]
  In the fluid switch 1 of the first embodiment or the second embodiment, the valve body 4 and the shaft 42 are fixed to each other and are relatively rotatable by the rotation support portion on the lid body 3 side. The rotation support shaft 43 of 42 may be fixed to the lid body 3 side, and the valve body may be configured to relatively rotate around the fixed rotation support shaft 43. In this case, if there is no problem of entanglement or adhesion of foreign matter or the like, it is possible to reduce the sliding resistance when rotating around the shaft 42 by forming a notch as shown by reference numeral 41d in FIG. become.
[0052]
  The groove 35 constituting the rotation support part of the fluid switch 1Bottom wallThe shape of 351 is not limited to the U-shaped groove shape as shown in the first embodiment, but may be, for example, a V-shaped groove shape or a rectangular groove shape. In short, if the relative movement in the radial direction of the rotation support shaft 43 can be prevented by point contact instead of line contact or surface contact, it can be held so as to be relatively rotatable.
[0053]
  Further, the molded valve body 4 may be subjected to antibacterial processing by using a synthetic resin impregnated with an antibacterial agent as a synthetic resin for molding the valve body 4 of the fluid switch 1. In particular, when used in a heat source machine as in the second embodiment, since the flowing fluid is hot water in the bathtub 100, it is preferable in that it can be kept clean by preventing the growth of bacteria in the valve body 4 and the like. Applies to
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a fluid switch according to a first embodiment of the present invention.
FIG. 2 is an exploded perspective view of a valve body and a lid body.
FIG. 3 is a cross-sectional explanatory view of an exploded state taken along line AA in FIG. 1;
4 is an enlarged cross-sectional explanatory view taken along the line BB in FIG. 3. FIG. 4 (a) shows a state in the middle of assembly, and FIG. 4 (b) shows an assembled state.
FIG. 5 is a schematic diagram showing a heat source device of a second embodiment.
FIG. 6 is a view corresponding to FIG. 1 showing a conventional fluid switch.
7 is an exploded perspective view of the valve body of FIG. 6. FIG.
[Explanation of symbols]
1 Fluid switch
2 Housing body (first member; housing)
3 Lid (second member; housing)
4 Disc
5 Magnet (weight)
6 Proximity sensor
23 Opening of the housing body
24 channels
32 Opening of lid
35 Groove
42 Shaft
43 Rotating spindle (shaft end of shaft, both ends of shaft)
81 Circulation path (Piping)
200 Bathtub with water heater (heat source machine for fluid heating)
271 ConvexPart
351 Bottom wall

Claims (6)

A valve element that is held so as to be swingable and rotatable with respect to the housing, and when the fluid does not flow in the flow path, is closed while closing the flow path, and is opened by receiving the pressure of the fluid flow A fluid switch configured to detect the flow of fluid by this opening and closing operation,
On the valve body, the rotation support shaft protrudes on both sides,
The housing is formed by connecting the first member and the second member with the openings facing each other,
One of the first member and the second member is integrally formed with a pair of concave groove portions in which the rotation support shafts on both sides can be inserted from the opposite directions, and the other is relative to the inside of the both groove portions. A pair of convex parts that can be fitted in from the direction are integrally formed ,
The pair of groove portions are respectively opened on a first member side in the opposite direction and a side connecting the pair of groove portions orthogonal to the opposite direction, and the groove width is an outer diameter of the rotation support shaft. Is set to approximately the same dimensions as
The convex portion and the groove portion are connected to each other in a state where the rotation support shaft is inserted into the groove portion from the opposite direction, so that the convex portion is in the groove portion. It is fitted to be configured such that the rotation shaft seal life and death the rotary shaft of the groove so as not to fall off from the inside groove is supported sandwiched therebetween between the protrusion and the groove A fluid switch characterized by having The fluid switch according to claim 1 ,
The valve body is formed by synthetic resin molding integrally with a shaft serving as a rotation support shaft,
The aforementioned protrusion and groove allow the relative rotation of both protruded end portions of the upper Symbol shaft between the bottom wall portion of the tip and the groove of the projecting portion in a state where the first member and the second member are connected to each other A fluid switch configured to hold on. The fluid switch according to claim 2 ,
A fluid switch in which the valve body is integrally formed by synthetic resin molding in a state where a weight adjusting weight for maintaining a closed state is embedded therein. A fluid switch according to any one of claims 2 and 3 ,
A fluid switch in which the valve body is formed in a state in which only both end portions of a shaft serving as a rotation support shaft are exposed to the outside and the shaft is embedded in substantially the entire length. A fluid switch according to any one of claims 2, 3 and 4 ,
A fluid switch made by applying antibacterial processing to the valve body. In a heat source device for fluid heating provided with piping for flowing fluid,
A heat source machine comprising the fluid switch according to any one of claims 1 to 5 for the pipe.

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