JP6343912B2 - Waterproof case, flow path switching unit including the same, and hot water supply system - Google Patents

Description

  The present invention relates to a waterproof case that houses an electrical device therein, a flow path switching unit that includes the waterproof case, and a hot water supply system.

The present applicant has previously proposed one described in Patent Document 1 as an example of a waterproof case.
The waterproof case described in the document houses a flow path switching valve, a motor for driving the flow path switching circuit, and circuit equipment for motor control, and constitutes a flow path switching unit. This flow path switching unit is connected to a hot water supply device by piping and is used in a bathroom. For this reason, the waterproof case is required to have excellent waterproof performance. Therefore, in Patent Document 1, as means for closing an opening formed on one side surface of the case main body of the waterproof case, means for screwing a plurality of locations of the lid to the case main body is employed.

  However, in the prior art, in order to eliminate the gap between the case main body and the lid body and improve the waterproof performance, it is necessary to increase the number of screwing portions of the lid body. When the number of screwing points is increased in this way, the number of parts increases, so that the part cost, the processing cost, and the assembly work cost increase, and the total manufacturing cost also increases.

As means for avoiding the above-described problems, it is conceivable to fit the lid to the opening of the case body and to seal the fitting portion by using an O-ring or the like. However, simply using such means has the following problems.
That is, when an electrical device is housed in the waterproof case, the internal pressure of the waterproof case increases due to heat generated from the electrical device, and the cover body may receive a force in a direction in which the lid body is detached from the case body. When such a force is generated, the above simple structure cannot be suitably dealt with, for example, the cover body is relatively displaced or the opening peripheral edge of the case body is deformed outward by the internal pressure. As a result, there is a risk that the sealing performance due to the O-ring may deteriorate. In particular, when the opening of the case body has a long rectangular shape and the dimension of the long side of the opening peripheral portion is relatively long, the internal pressure tends to cause warping or distortion in the long side. Defects are more likely to occur. Further, the long side portion is likely to be warped or distorted from the beginning, and often has such deficiencies when the resin molding is completed. Therefore, there is a problem that it is difficult to achieve an appropriate seal due to warpage of the long side portion even during normal time when the internal pressure of the waterproof case is not increased. Increasing the thickness of the waterproof case can alleviate the problems as described above. However, if such a means is adopted, the manufacturing cost becomes expensive.

  Patent Document 2 describes that an engaging portion is provided on the lid body as a means for preventing the lid body from being detached from the case main body. However, it is difficult to adequately solve the above-described problem that the waterproof performance is lowered when the pressure in the waterproof case is increased, simply by preventing the lid from coming off.

JP 2013-72613 A Japanese Patent No. 2782497

  The present invention has been conceived under the circumstances described above, and eliminates the need for screwing many places, and increases the internal pressure to force the lid to come off the case body. It is an object of the present invention to provide a waterproof case, a flow path switching unit provided with the waterproof case, and a hot water supply system that can appropriately prevent the seal performance from greatly deteriorating even in the case of receiving the heat. .

  In order to solve the above problems, the present invention takes the following technical means.

The waterproof case provided by the first aspect of the present invention accommodates an electrical component inside and at least one surface is open, and the peripheral edge of the opening includes a pair of long side and short side. A case body having a rectangular frame shape, a lid body fitted to the opening peripheral edge portion of the case main body so as to close the opening, and the peripheral surfaces of the opening peripheral edge portion and the lid body. A seal member interposed therebetween, and a first and a second that are respectively provided on the peripheral edge of the opening and the lid, and are engageable with each other in a state in which the lid is fitted to the peripheral edge of the opening A waterproof case, wherein at least one of the first and second engaging portions is inclined with respect to a fitting direction of the case body and the lid body A surface portion is provided, and the lid body is the case book. When receiving a force in a direction away from the second engaging portion, the second engaging portion can generate a pressing force that presses the first engaging portion by the guide action of the inclined surface portion. The direction is configured to be the direction toward the side where the seal member is disposed among the inside and the outside of the case body, and the first engagement portion is the pair of the case body. A long side portion is provided on each of the pair of short side portions or the pair of short side portions of the case body. It is characterized in that it can be connected and fixed .
Here, “the direction toward the side where the seal member is disposed” means that when the seal member is disposed inside the case body, the direction of the pressing force is the inside direction of the case body. When the seal member is arranged outside the case body, the direction of the pressing force is the outside direction of the case body.

According to such a configuration, the following effects can be obtained.
That is, when the internal pressure of the waterproof case increases due to heat generated from the electrical equipment, and the cover body receives a force in the direction of detaching from the case body, the cover body is provided on the cover body based on the guide action of the inclined surface portion. The 2nd engaging part which presses will press the 1st engaging part provided in the opening peripheral part of the case main body. This pressing force is directed toward the inside and outside of the case body toward the side where the seal member is disposed, so that it acts not only as a resistance against the lid body being detached from the case body but also as a peripheral edge of the opening of the case body. It is possible to appropriately prevent the portion from being deformed to the side opposite to the arrangement side of the seal member. In other words, the opening peripheral portion of the case main body is prevented from being warped and deformed outwardly even though the seal member is disposed inside the case main body, for example. On the contrary, when the seal member is disposed outside the case body, it is suppressed that the opening peripheral edge portion of the case body is warped and deformed inward. Therefore, it is possible to maintain an appropriate sealing state between the opening peripheral edge portion of the case body and the lid body and to obtain excellent sealing performance (waterproof performance).
In the present invention, as a result of obtaining the above-mentioned effects, it is not necessary to increase the number of screwing portions of the lid to the case body, or it is possible to eliminate the need for screwing, simplifying the structure, and manufacturing costs. Can also be reduced.
Furthermore, according to the present invention, by engaging the first and second engaging portions, it is also possible to obtain an effect of correcting warping or the like occurring at the opening peripheral edge portion of the case body.
Further, the long side portion of the rectangular frame-shaped opening peripheral portion of the case main body is a portion that inherently tends to be warped or distorted. On the other hand, according to the said structure, it is possible to prevent such a curvature of a long side part suitably, and to improve waterproof performance. For example, when a means for screwing the long side portion of the opening peripheral portion with respect to the lid is employed, it is necessary to increase the number of screw-fixed portions because the long side portion has a long dimension. It is possible to eliminate such a need.
Further, according to the above configuration, the waterproof performance can be further improved by connecting and fixing the case main body and the lid using the connecting member, but the connection target portion is a pair of short sides of the case main body. Since it is a part or side wall part corresponding to this, the whole cover body can be attached to a case main body with sufficient balance in relation to the 1st engaging part provided in the long side part. It is also possible to reduce the number of connection fixing portions using the connection member.

In the present invention, preferably, the inclined surface portion includes first and second inclined surface portions provided in the first and second engaging portions, respectively, and the first and second engaging portions. The first and second inclined surface portions are engaged when the first and second inclined surface portions are in face-to-face contact with each other, and when the cover body receives a force in a direction to come off from the case main body. It is comprised so that it may mutually press.

  According to such a configuration, the engagement state between the first and second engagement portions is stabilized, which is more preferable in enhancing the effect of correcting the warp of the opening peripheral edge portion of the case body. . Further, it is possible to stably obtain an action in which the first engagement portion is pressed in a predetermined direction when the cover body receives a force in a direction in which the lid body is detached from the case main body.

  In the present invention, preferably, the lid body has a fitting portion that fits inside the case main body, and the seal member is interposed between the outer peripheral surface of the fitting portion and the inner peripheral surface of the case main body. The first engaging portion is provided by the outer peripheral surface of the opening peripheral portion of the case body being the first inclined surface portion, and the first inclined surface portion is the first inclined portion. The first engaging portion is inclined so as to be located on the outer side of the case body as it proceeds from the proximal end side to the distal end side, and the second engaging portion is located outside the first engaging portion. An inclined surface portion that is located and has the same inclination direction as the first inclined surface portion is formed inside the second engaging portion as the second inclined surface portion.

  According to such a configuration, the gap between the fitting portion of the lid body and the inner peripheral surface of the case body can be properly sealed using the sealing member, while the force in the direction in which the lid body is detached from the case body. When received, the first engaging portion is pressed to the inside of the case main body by the guide action of the first and second inclined surface portions so that the seal structure using the seal member is not damaged. Thus, according to the said structure, the effect | action which this invention intends by a simple structure is acquired.

The flow path switching unit provided by the second aspect of the present invention includes a motor for driving the flow path switching valve, and a case for accommodating a circuit device for controlling the motor. The waterproof case provided by the first aspect of the present invention is used.
The hot water supply system provided by the third aspect of the present invention includes a latent heat recovery type hot water supply device installed outside the bathroom, and hot water and drain water installed in the bathroom and sent from the hot water supply device in the bathtub. A hot water supply system comprising a channel switching means for switching between a guiding mode and a mode of guiding and discharging outside the bathtub, wherein the channel switching unit is the second aspect of the present invention. The flow path switching unit provided by is used.
According to such a configuration, the same effect as described for the waterproof case provided by the first aspect of the present invention can be obtained.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

It is a perspective view which shows an example of the waterproof case which concerns on this invention, and a flow-path switching unit provided with this, (b) is Ib-Ib sectional drawing of (a). It is a disassembled perspective view of the flow-path switching unit shown to Fig.1 (a). (A) is IIIa-IIIa principal part sectional drawing of Fig.1 (a), (b) is an exploded sectional view of (a). It is explanatory drawing which shows an example of the hot water supply system provided with the flow-path switching unit shown in FIG. (A)-(e) is principal part sectional drawing which shows the other example of this invention.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

  The flow path switching unit U shown in FIGS. 1 and 2 is installed in the bathroom 4 and connected to the outdoor hot water supply device 1 and used as will be described later with reference to FIG. This flow path switching unit U includes a waterproof case C, a flow path switching valve 2, a motor M for driving the same, and a circuit device 25 for driving control of the motor M.

  The flow path switching valve 2 is, for example, a three-way valve type ball valve having ports P1 to P3, and is attached to the bottom of the waterproof case C so as to protrude downward. The motor M is for rotating the valve body 20 of the flow path switching valve 2 and is housed in the waterproof case C together with the circuit device 25. The circuit device 25 is disposed at an appropriate position in the waterproof case C in a state where it is housed in the inner case 26 and protected. The waterproof case C is provided with a harness insertion hole 57 for drawing the harness 27 from the outside and a diaphragm 58. The harness insertion hole 57 is sealed so that water does not enter the waterproof case C from the outside. The diaphragm 58 is deformed according to the pressure in the waterproof case C, and serves to alleviate pressure fluctuation.

  The waterproof case C includes a substantially rectangular parallelepiped case main body 5 having an open upper surface, a lid body 6 for closing the opening 50 on the upper surface of the case main body 5, and a rubber or resin O-ring 7 (an example of a seal member). ). Both the case main body 5 and the lid body 6 are made of resin. As clearly shown in FIGS. 2 and 3, the opening peripheral portion 51 and the lid body 6 of the case body 5 are provided with first and second engaging portions 52 and 62.

The opening peripheral part 51 of the case main body 5 has a long rectangular frame shape, and has a pair of a long side part 51a and a short side part 51b. The first engaging portion 52 is provided only on the pair of long side portions 51 a in the opening peripheral edge portion 51. More specifically, the first engaging portion 52 is provided only in a range of a predetermined length La at a substantially central portion in the longitudinal direction of each long side portion 51a. The lid 6 has a fitting portion 64 that can be fitted into the opening 50 of the case body 5, and a flange portion 65 that is larger in size than the fitting portion 64 and is connected to the upper side of the fitting portion 64. The second engaging portion 62 is provided on the flange portion 65 so as to correspond to the position and length La of each of the pair of first engaging portions 52. A grid-like rib 65 a is provided on the upper surface portion of the lid body 6, and this is a portion for reducing the weight while increasing the strength of the lid body 6. An annular groove 70 for mounting an O-ring 7 in which the O-ring 7 is mounted is provided on the outer peripheral surface of the fitting portion 64. As shown in FIG. 3A, in the state where the lid body 6 is attached to the case body 5, the O-ring 7 is configured so that the inner circumferential surface of the opening peripheral edge portion 51 of the case body 5 and the outer circumference of the fitting portion 64 of the lid body 6. It is sandwiched between the surface (including the groove 70 on the outer peripheral surface).

  As clearly shown in FIG. 3, the first engaging portion 52 is formed with a notch-like recess 54 in a part on the outer surface side of the opening peripheral portion 51 of the case body 5, and It forms by making the outer surface which opposes into the 1st inclined surface part 52a. The first inclined surface portion 52a is inclined so as to be positioned on the outer side of the case body 5 as it goes upward. Therefore, the cross-sectional shape of the first engaging portion 52 is wider on the distal end side than on the proximal end side.

  The second engaging portion 62 is a protrusion that protrudes downward from the flange portion 65 of the lid body 6, and is spaced apart from the fitting portion 64 via a recess 66. The lid body 6 is fitted to the case body 5. When they are combined, they are positioned outside the first engaging portion 52. The concave portion 66 is a portion for inserting the first engaging portion 52. The inner surface of the second engaging portion 62 is a second inclined surface portion 62a, and this second inclined surface portion 62a is the first inclined surface portion when the lid body 6 is fitted to the case body 5. The first inclined surface portion 52a and the inclination direction thereof are the same, and the inclination angle is substantially the same so as to face the surface 52a. The first and second engaging portions 62 are restricted from moving in the direction in which the lid 6 is detached from the case body 5 by the contact of the first and second inclined surface portions 52a and 62a. Engagement, and as will be described later, a sealing performance lowering prevention function is obtained. When the case body 5 is not attached with the lid 6, the long side portion 51 a of the case body 5 has the flexibility to be deformed relatively easily in the direction indicated by the arrow Na in FIG. Therefore, the first and second engaging portions 52 and 62 can be easily engaged when attempting to attach the lid body 6 to the case body 5 from the state shown in FIG.

  As shown in FIG. 2, each short side 51b of the case body 5 or a side wall 55 corresponding to each short side 51b protrudes to the outside of the case body 5 and is provided with a screw hole 56a. Is provided. The lid body 6 is provided with a hole 67 corresponding to the screw hole 56a. The lid body 6 uses a screw body 90 such as a screw (an example of a connecting member in the present invention) for the protruding portion 56. It is possible to fix the connection.

FIG. 4 shows a hot water supply system S using the flow path switching unit U described above.
In this hot water supply system S, the flow path switching unit U is installed in the bathroom 4, and the port P1 of the flow path switching valve 2 of this flow path switching unit U and the circulation adapter 40 of the bathtub 45 are the latent heat recovery type installed outdoors. Is connected to the hot water supply apparatus 1 through the piping portions 35a and 35b. The port P2 of the flow path switching valve 2 is connected to the circulation adapter 40 by piping, and the port P3 is a port for guiding drain water sent from the hot water supply device 1 to the discharge port of the bathroom 4. In FIG. 4, the flow path switching unit U is shown below the bathtub 45, but actually, the gap between the bathtub 45 and the side wall 42 of the bathroom 4 or the apron ( It is installed in the inner space (not shown).

The hot water supply device 1 is a latent heat recovery type gas hot water supply device having a general hot water supply function, a bath hot water supply (hot water filling) and a reheating function. The hot water supply device 1 has the same basic configuration as that conventionally known, and heat exchange for recovering sensible heat and latent heat from the combustion gas generated by the gas burners 10a and 10b, the fan 11, and the gas burners 10a and 10b. 12a, 12b, neutralizer 13 for neutralizing strongly acidic drain water generated along with recovery of latent heat and passing through flow path 37, and for temporarily storing drain water after neutralization treatment The storage tank 14 is provided. At the time of the general hot water supply operation, the water supplied to the water inlet 30a is supplied to the heat exchanger 12a via the piping 30 and heated, and the hot water generated by this heating is supplied via the piping 31 and 32. Supplied to Karan 33 and the like.

  During the hot water filling operation, the on-off valve V1 of the hot water supply device 1 is opened, and hot water flows from the pipe parts 31 and 34 to the pipe parts 35a and 35b (pipe part 35a) as indicated by broken arrows N1 to N3. To flow from the piping part 34 through the piping parts 38b and 38a). Thus, hot water flows into the bathtub 45 from both the discharge port 40a and the suction port 40b of the circulation adapter 40. At that time, the ports P1 and P2 are in communication with each other, and the ports P1 and P3 are in a disconnected state. During the bath chasing operation, the hot water of the bathtub 45 flows along a path indicated by solid arrows N11 to N15 by driving the pump P of the hot water supply device 1. Specifically, the hot water in the bathtub 45 is sent from the suction port 40b to the heat exchanger 12b via the piping parts 35b and 38b and heated, and then the flow path switching unit via the piping parts 38a and 35a. U is reached and returned from the port P2 through the circulation adapter 40 into the bathtub 45.

  The drain water discharging operation from the storage tank 14 is to drive the pump P after setting the on-off valve V3 to the closed state and setting the valve V2, which is a three-way valve, to the state in which the pump P and the storage tank 14 communicate with each other. It is executed by. When the pump P is driven, the drain water in the storage tank 14 flows along a path indicated by white arrows N21 to N25. Specifically, the drain water in the storage tank 14 reaches the flow path switching unit U via the valve V2, the piping part 38b, the heat exchanger 12b, and the piping parts 38a and 35a. In the flow path switching unit U, the ports P1 and P2 are blocked and the ports P1 and P3 are in communication. For this reason, drain water can be led to the discharge port of the bathroom 4 from the port P3 and discarded.

  Next, the operation of this embodiment will be described.

  First, in the flow path switching unit U, the internal pressure of the waterproof case C may increase due to heat generated from the motor M or the circuit device 25. In this case, as shown in FIG. 3 (a), the lid body 6 receives a force F1 in a direction to disengage the case body 5 from the upper side. When such a force F1 is generated, the first and second Due to the guide action between the inclined surface portions 52 a and 62 a, a pressing force F <b> 2 is generated in which the second engagement portion 62 presses the first engagement portion 52 to the inside of the case body 5. Therefore, the engagement state of the first and second engagement portions 52 and 62 becomes strong, and these engagement states are not inadvertently released, and the lid body 6 moves upward and comes off. Such a situation is accurately prevented.

  In addition, as an important effect, the first engaging portion 52 is also prevented from warping and deforming outside the case body 5. If the first engaging portion 52 is warped and deformed outside the case body 5, the pinching state of the O-ring 7 disposed inside the case body 5 is eliminated, and the seal by the O-ring 7 is eliminated. Sex is reduced. On the other hand, in this embodiment, it is possible to suppress such a malfunction, maintain the sealing performance using the O-ring 7 in a good state, and improve the waterproof performance of the waterproof case C.

  Since the first and second engaging portions 62 exhibit the action of correcting the warp and the like generated in the opening peripheral edge portion 51 of the case body 5 in the normal time, the sealing performance in the normal time is also good. Since the first and second engaging portions 52, 62 are configured so that the first and second inclined surface portions 52a, 62a face each other, the correction action described above and the lid body 6 received the force F1. Sometimes, the action of the first engaging portion 52 being pressed in a predetermined direction can be stably obtained.

Of the opening peripheral edge portion 51 of the case body 5, the long side portion 51a is a portion where deformation such as warpage or distortion is likely to occur as compared with the short side portion 51b. In the present embodiment, the first and second portions are provided. Since the configuration is such that the engaging portions 52 and 62 are used to correct the long side portion 51a and to prevent unjustified deformation when receiving the force F1, the waterproof performance can be increased reasonably. For example, if the long side portion 51a is to be connected to the lid body 6 by screwing means, it is necessary to increase the number of screwing points, but in this embodiment, such a need can be eliminated.

  Since the short side portion 51b of the opening peripheral edge portion 51 of the case body 5 or the side wall portion 55 corresponding thereto is fixed to the lid body 6 using the screw body 90, the lid to the case body 5 is covered. This is preferable in increasing the reliability and reliability of attachment of the body 6. Since the short side portion 51b is less likely to be deformed such as warpage or distortion as compared with the long side portion 51a, the first and second engaging portions 52 and 62 are not provided on the short side portion 51b. There is no particular problem. In this embodiment, the sealing performance of the location corresponding to the short side part 51b is sufficiently ensured by the fixed connection using the screw body 90. Since the screw body 90 is tightened in two places in total, the assembling work of the waterproof case C is easy, and the manufacturing cost of the waterproof case C can be reduced.

  FIG. 5 shows another example of the first and second engaging portions 52 and 62. Elements that are the same as or correspond to those in the above embodiment are given the same reference numerals as in the above embodiment.

In FIG. 5A, the O-ring 7 is disposed at a location where the O-ring 7 comes into contact with the first engagement portion 52. According to such a configuration, the first engagement portion 52 and the O-ring are directly used by directly utilizing the force with which the first engagement portion 52 is pressed to the inside of the case body 5 by the second engagement portion 62. 7 can be brought into pressure contact with each other.
In FIG. 2B, a groove 70 for mounting the O-ring 7 is formed on the inner peripheral surface of the case body 5. In FIG. 5C, an O-ring 7 is provided between a step 59 formed on the inner peripheral surface of the case body 5 and a step 69 formed on the outer peripheral surface of the fitting portion 64 of the lid body 6. It is intervened. In these configurations, the same operation as the configuration shown in FIG. 3 can be obtained.

In FIG. 5D, the arrangement of the first and second engaging portions 52 and 62 and the arrangement of the case main body 5 and the O-ring 7 are different from the structure shown in FIG. Yes. Specifically, the O-ring 7 is disposed outside the base portion of the first engagement portion 52. A protrusion 68 of the lid 6 is located outside the O-ring 7, and this portion serves as a seal portion. The first inclined surface portion 52a is formed on the inner surface of the first engaging portion 52, and is inclined so as to be positioned inside the case body 5 as it goes upward. The second engaging portion 62 is located inside the first inclined surface portion 52a and has a second inclined surface portion 62a that is in contact with the first inclined surface portion 52a.
In the present embodiment, when the lid 6 receives the upward force F <b> 1, a pressing force F <b> 3 is generated in which the second engagement portion 62 presses the first engagement portion 52 toward the outside of the case body 5. . Therefore, the first engaging portion 52 is appropriately prevented from warping and deforming on the side opposite to the side where the O-ring 7 is disposed. As understood from the present embodiment, in the present invention, a configuration in which an O-ring is disposed outside the opening peripheral portion 51 of the case body 5 and a configuration in which the lid 6 is externally fitted to the opening peripheral portion 51 are used. You can also.

In FIG. 5 (e), of the first and second engaging portions 52, 62, only the first engaging portion 52 is provided with an inclined surface portion 52 a, and the second engaging portion 62 has an inclined surface portion. Is not provided. A convex portion 62b that abuts the lower side region of the inclined surface portion 52a is provided at the lower end tip of the second engaging portion 62.
In the present embodiment, when the lid 6 receives the upward force F1, the second engaging portion 62 is also the first engaging portion 52 by the action of the convex portion 62b being guided by the inclined surface portion 52a. It is possible to generate a pressing force F2 that presses in a predetermined direction.
Although not shown in the drawings, in the present invention, contrary to the above-described configuration, only the second engaging portion 62 is provided with an inclined surface portion, and the first engaging portion 52 has a second engaging portion. It is also possible to adopt a configuration in which a convex portion capable of contacting the inclined surface portion of the portion 62 is provided.

  The present invention is not limited to the embodiment described above. The specific configuration of each part of the waterproof case, the flow path switching unit, and the hot water supply system according to the present invention can be variously modified within the scope intended by the present invention.

  In the embodiment described above, the waterproof case of the type in which the upper surface opening portion of the case body is closed with a lid has been described as an example, but the present invention is not limited to this, and the case body has a side opening shape or a bottom opening shape. Even if it is a thing, it is possible to apply this invention.

As the attachment means of the cover into to case body, it is possible to adopt a configuration that does not use any screw member or other coupling members such as screws. As the seal member, a member other than the O-ring can be used.

  In the above-described embodiment, an example in which the waterproof case is used as a component of the flow path switching unit is given, but the use of the waterproof case is not limited to this. The waterproof case according to the present invention is suitable for use as a case for a bathroom installation device (for example, a case for housing a component device for an automatic bathtub cleaning device, a component device for an automatic drain device for a bathtub, etc.). The present invention can be used for accommodating various electric devices other than installed devices.

  The latent heat recovery type hot water supply apparatus used in the hot water supply system according to the present invention is not limited to the type that performs latent heat recovery from the combustion gas generated using a burner. For example, a hot water supply device of a type that recovers latent heat from high-temperature exhaust gas discharged from a gas engine or a fuel cell used in a cogeneration system can be provided.

C Waterproof case S Hot water supply system M Motor (electrical equipment)
U channel switching unit 1 hot water supply device 2 channel switching valve 25 circuit device (electrical device)
4 Bathroom 45 Bathtub 5 Case body 50 Opening (case body)
51 Opening peripheral part 51a Long side part (of opening peripheral part)
51b Short side (periphery of opening)
52 First engagement portion 52a First inclined surface portion 6 Lid 62 Second engagement portion 62a Second inclined surface portion 64 Insertion portion 7 O-ring (seal member)
90 Screw body (connecting member)

Claims (5)

The electrical component is housed inside, and at least one surface is open, and the peripheral edge of the opening has a rectangular frame shape having a pair of long sides and short sides , and
A lid fitted to the peripheral edge of the opening of the case body so as to close the opening;
A seal member interposed between the peripheral edge of the opening and the peripheral surface of the lid;
A first engaging portion and a second engaging portion, which are provided in the opening peripheral portion and the lid body, respectively, and can be engaged with each other in a state where the lid body is fitted to the opening peripheral portion;
A waterproof case comprising:
At least one of the first and second engaging portions is provided with an inclined surface portion that is inclined with respect to the fitting direction of the case body and the lid body, and the lid body is in a direction away from the case body. When receiving a force, it is possible to generate a pressing force by which the second engaging portion presses the first engaging portion by the guide action of the inclined surface portion,
The direction of the pressing force is configured to be the direction toward the side where the seal member is disposed, of the inside and outside of the case body ,
The first engaging portion is provided on each of the pair of long side portions of the case body,
Of the case body, the pair of short sides or the side wall provided corresponding to the pair of short sides can be connected and fixed to the lid using a connecting member. Features a waterproof case. The waterproof case according to claim 1,
The inclined surface portion includes first and second inclined surface portions provided in the first and second engaging portions, respectively.
The first and second engaging portions are engaged when the first and second inclined surface portions are in face-to-face contact with each other, and when the lid body receives a force in a direction away from the case body. A waterproof case configured so that the first and second inclined surface portions are pressed against each other. The waterproof case according to claim 2,
The lid body has a fitting portion that fits inside the case main body, and the seal member is interposed between the outer peripheral surface of the fitting portion and the inner peripheral surface of the case main body,
The first engagement portion is provided by forming an outer peripheral surface of the opening peripheral portion of the case body as the first inclined surface portion, and the first inclined surface portion is formed of the first engagement portion. As it goes from the proximal end side to the distal end side, it is inclined to be located outside the case body,
The second engaging portion is located outside the first engaging portion, and inside the second engaging portion, as the second inclined surface portion, the first inclined surface portion and A waterproof case in which inclined surface portions having the same inclination direction are formed. A motor for driving the flow path switching valve, and a case for accommodating a circuit device for controlling the motor;
The flow path switching unit, wherein the waterproof case according to any one of claims 1 to 3 is used as the case . A latent heat recovery type water heater installed outside the bathroom;
A flow path switching means for switching between a mode of guiding hot water and drain water sent from the hot water supply device to the bathtub and a mode of guiding and discharging out of the bathtub, which are installed in the bathroom,
A hot water supply system comprising:
A hot water supply system using the flow path switching unit according to claim 4 as the flow path switching means.

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