Hot water filling control device

Abstract

To facilitate assembly of a hot water filling control device which has a first joint part in a hot water supply passage and which has a second joint part in a pressure detection passage.SOLUTION: A hot water filling control device includes a solenoid valve in a hot water supply passage 31 for guiding hot water from a hot water supply device side to a bathtub side, and two check valves provided in series further on the bathtub side than the solenoid valve, and it also includes an atmosphere release valve in an atmosphere release passage branched from between the two check valves. In the atmosphere release valve, a pressure detection passage 39 is connected branched further from the hot water supply device side than the solenoid valve in the hot water supply passage, and the valve closes by the fact that the pressure of hot water in the pressure detection passage is higher than the atmosphere release passage by the specified value or more. Also, in the atmosphere release valve, a first joint part 31j is provided in which the hot water supply passage is made to be splittable further on the solenoid valve side than the branch point of the atmosphere release passage, and which is joined by inserting the male side into the female side, and a second joint part 39j is provided in which the pressure detection passage is made to be splittable, and which is joined by inserting the male side into the female side. Then, the first joint part and the second joint part are arranged so that the insertion directions are in parallel with each other, and the insertion amount of any one of them is set to be longer than the insertion amount of the other.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a water filling control device provided in a water filling passage for supplying hot water from a water heater to a bathtub and for controlling the water filling of the bathtub. More specifically, the present invention relates to a technique for facilitating the assembly of the water filling control device.

Background Art

[0002] In a water filling system that fills a bathtub with hot water generated by a water heater, a water filling control device for controlling the water filling is generally provided in a water filling passage for supplying hot water from the water heater to the bathtub. This water filling control device includes a solenoid valve, a check valve, an air release valve, and the like. The solenoid valve can open and close a water supply passage that forms part of the water filling passage and guides hot water from the water heater side to the bathtub side. When the solenoid valve is opened, the water filling starts, and when the solenoid valve is closed, the water filling stops. The check valve is provided on the bathtub side of the solenoid valve and is biased in the valve closing direction to close the water supply passage. When the pressure of the hot water supplied from the water heater exceeds a predetermined valve opening pressure due to the opening of the solenoid valve, the check valve opens to allow the hot water to pass through. On the other hand, when the pressure of the hot water supplied from the water heater drops below the predetermined valve opening pressure due to a water cut or the like during the water filling, the check valve closes, so that the reverse flow of hot water from the bathtub side to the water heater side through the water supply passage (water filling passage) can be prevented. By installing two check valves in series, it is possible to enhance the effect of preventing the reverse flow of hot water compared to the case where there is only one check valve.

[0003] An atmospheric vent valve is installed in an atmospheric vent passage that branches off between two check valves in the hot water supply passage. The atmospheric vent valve is biased in the valve-opening direction by an opening spring, and a pressure detection passage that branches off from the side of the hot water supply device rather than the solenoid valve in the hot water supply passage is connected thereto. When the pressure of the hot water in the pressure detection passage is higher than the pressure of the hot water in the atmospheric vent passage by a specified value or more, the valve is in a closed state against the biasing force of the opening spring. When the pressure of the hot water in the pressure detection passage decreases due to water cut-off or the like and the pressure difference with respect to the pressure of the hot water in the atmospheric vent passage becomes less than the specified value, the atmospheric vent valve opens by the biasing force of the opening spring, and the hot water between the two check valves is discharged and replaced with the inflowing air. Therefore, even if the closing of the check valve is incomplete, backflow of the hot water from the bathtub side to the hot water supply device side can be prevented.

[0004] In such a hot water filling control device, the hot water supply passage can be divided on the solenoid valve side rather than at the branch point of the atmospheric vent passage in the hot water supply passage, and it has a first joint part where the male side is inserted into the female side and joined, and the pressure detection passage can be divided and has a second joint part where the male side is inserted into the female side and joined. It is known that the insertion direction of the first joint part and the insertion direction of the second joint part are arranged in parallel, and assembly is facilitated by simultaneously joining the first joint part and the second joint part (Patent Document 1).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in a hot water filling control device having the above-described configuration, it is necessary to simultaneously perform alignment of the insertion in the first joint part of the hot water supply passage and alignment of the insertion in the second joint part of the pressure detection passage. Depending on variations in the component parts, there is a problem that assembly may become difficult instead.

[0007] The present invention is made to address the above-described problems in the prior art, and an object thereof is to provide a technology capable of facilitating the assembly of a hot water filling control device having a first joint portion in a hot water supply passage and a second joint portion in a pressure detection passage.

Means for Solving the Problems

[0008] In order to solve the above-described problems, the hot water filling control device of the present invention employs the following configuration. That is, In a hot water filling control device provided in a hot water filling passage for supplying hot water from a hot water supply device to a bathtub and controlling the hot water filling of the bathtub, a solenoid valve that forms part of the hot water filling passage and opens and closes a hot water supply passage for guiding hot water from the hot water supply device side to the bathtub side; two check valves provided in series on the bathtub side of the solenoid valve, biased in a valve closing direction for closing the hot water supply passage, and opening when the pressure of the hot water supplied from the hot water supply device exceeds a predetermined valve opening pressure due to the opening of the solenoid valve; an atmosphere release valve provided so as to be able to open and close an atmosphere release passage branched from between the two check valves of the hot water supply passage, biased in an opening direction by an opening spring, and connected to a pressure detection passage branched from the hot water supply device side of the solenoid valve in the hot water supply passage. When the pressure of the hot water in the pressure detection passage is higher than the pressure of the hot water in the atmosphere release passage by a specified value or more, it closes against the biasing force of the opening spring. On the other hand, when the pressure of the hot water in the pressure detection passage drops and the pressure difference with respect to the pressure of the hot water in the atmosphere release passage becomes less than the specified value, it opens by the biasing force of the opening spring and discharges the hot water between the two check valves; and the hot water supply passage is made divisible on the solenoid valve side of the branch point of the atmosphere release passage in the hot water supply passage, and has a first joint portion in which a male side is inserted into a female side and joined, the pressure detection passage is made divisible, and has a second joint portion in which a male side is inserted into a female side and joined, in addition to the insertion direction of the first joint portion and the insertion direction of the second joint portion being arranged in parallel, Of the first joint part and the second joint part, the insertion amount during the joining of either one is set to be longer than the insertion amount during the joining of the other. It is characterized by this.

[0009] In the assembly work of such a hot water supply control device of the present invention, when the male side starts to enter the female side at the joint part with the longer insertion amount among the first joint part and the second joint part, there is a gap between the male side and the female side at the other joint part with the shorter insertion amount and it has not entered yet. So, the operator only needs to pay attention to the alignment of the insertion of one joint part. After that, when the male side starts to enter the female side at the other joint part, since the male side has already been inserted into the female side at one joint part and there is no need for alignment, the operator only needs to pay attention to the alignment of the insertion of the other joint part. Compared with the case of simultaneously aligning the insertions of the two joint parts, the assembly of the hot water supply control device can be made easier.

[0010] In the above-described hot water supply control device of the present invention, a seal part in which a seal member is interposed between the male side of the joint part with the longer insertion amount during joining among the first joint part and the second joint part and the male side of the joint part to be inserted, and a diameter-expanded part whose inner diameter is expanded on the inlet side rather than the seal part may be provided.

[0011] In this way, in the joint part with the longer insertion amount, when the male side starts to enter the female side, the diameter-expanded part functions as a guide and the allowable range of alignment expands. Therefore, compared with the case where the diameter-expanded part is not provided, the assembly of the hot water supply control device can be made easier.

[0012] In such a hot water supply control device of the present invention, either one of the first joint part and the second joint part with the longer insertion amount during joining may be prevented from coming off by the engagement between a connection pin inserted in a direction orthogonal to the insertion direction in the joined state and a flange portion protruding from the outer periphery of the male side.

[0013] With such an engagement between the connection pin and the flange portion, compared to fixing by screwing or the like, play due to the gap between the connection pin and the flange portion can be ensured in the insertion direction of the joint portion, so that the margin for assembly increases for the entire hot water supply control device. Therefore, even if there are variations in the components of the hot water supply control device, the variations can be absorbed (adjusted) by the play of the joint portion, making it easier to assemble the hot water supply control device.

[0014] Further, in such a hot water supply control device of the present invention, the insertion amount at the time of joining the second joint portion may be set longer than the insertion amount at the time of joining the first joint portion.

[0015] Generally, since the second joint portion of the pressure detection passage has a smaller diameter than the first joint portion of the hot water supply passage, by making the insertion amount of the second joint portion longer in this way, compared to the case of making the insertion amount of the first joint portion longer, it becomes possible to make the hot water supply control device more compact.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0017] FIG. 1 is an explanatory diagram showing the overall configuration of the hot water supply system 1 including the hot water supply control device 30 of this embodiment. As shown in the figure, the hot water supply system 1 includes a hot water supply device 10 that generates hot water, a bathtub 2 that stores hot water, a hot water supply passage 22 that supplies hot water from the hot water supply device 10 to the bathtub 2, a hot water supply control device 30 installed in the hot water supply passage 22, and the like.

[0018] The water supply device 10 includes a combustion chamber 12 with a burner 11 for burning fuel gas. The burner 11 is supplied with fuel gas through a gas passage 13, and a gas solenoid valve 14 for opening and closing the gas passage 13 is provided in the gas passage 13. Further, a combustion fan 15 is connected to the combustion chamber 12, and combustion air is sent to the burner 11 by the combustion fan 15.

[0019] Above the burner 11, a heat exchanger 16 is provided. The combustion exhaust generated by the combustion in the burner 11 passes through the heat exchanger 16 and is discharged to the outside of the water supply device 10. On the upstream side of the heat exchanger 16, a water supply passage 17 is connected, and make-up water is supplied to the heat exchanger 16 through the water supply passage 17. A water flow sensor 18 for detecting the flow of the make-up water is provided in the water supply passage 17. When the water flow sensor 18 detects the flow of the make-up water, the combustion fan 15 operates, and an ignition device (not shown) operates. Subsequently, the gas solenoid valve 14 is opened to start the combustion in the burner 11. The make-up water supplied to the heat exchanger 16 is heated by heat exchange with the combustion exhaust and then flows out as hot water into the hot water passage 20.

[0020] The hot water passage 20 connected to the downstream side of the heat exchanger 16 is connected to a hot water tap 21 (so-called calan). As the hot water is consumed by opening the hot water tap 21, make-up water is supplied to the heat exchanger 16. Further, a hot water expansion passage 22 branches from the hot water passage 20, and hot water is supplied to the bathtub 2 via a hot water expansion control device 30.

[0021] FIG. 2 is an explanatory diagram conceptually showing the configuration of the hot water expansion control device 30 of the present embodiment. First, FIG. 2(a) shows the overall configuration of the hot water expansion control device 30 installed in the hot water expansion passage 22. The hot water expansion control device 30 of the present embodiment includes a hot water expansion solenoid valve 32, a flow rate sensor 33, a filter 34, two check valves (a first check valve 35 and a second check valve 36), etc. on a hot water supply passage 31 that forms a part of the hot water expansion passage 22 and guides hot water from the water supply device 10 side (lower right in the figure) to the bathtub 2 side (left side in the figure).

[0022] The hot water filling solenoid valve 32 can open and close the hot water supply passage 31. The hot water filling starts when the hot water filling solenoid valve 32 is opened, and stops when the hot water filling solenoid valve 32 is closed. A well-known pilot-operated solenoid valve is used for the hot water filling solenoid valve 32 in this embodiment, but a direct-acting solenoid valve may also be used. Since a pilot-operated solenoid valve that utilizes differential pressure generally opens and closes with a smaller force compared to a direct-acting solenoid valve, it is possible to reduce the size of the actuator and suppress power consumption. Note that the hot water filling solenoid valve 32 in this embodiment corresponds to the "solenoid valve" of the present invention.

[0023] The flow rate sensor 33 is provided on the upstream side (the hot water supply device 10 side) of the hot water filling solenoid valve 32, and measures the flow rate of the hot water passing through the hot water supply passage 31. The flow rate sensor 33 in this embodiment incorporates an impeller that rotates by the flow of the hot water in the hot water supply passage 31, and measures the flow rate of the hot water based on the rotation speed of the impeller. Also, a filter 34 is provided on the upstream side of the flow rate sensor 33 to remove foreign matter mixed in the hot water from the hot water supply device 10, thereby suppressing a situation where the flow rate sensor 33 and the hot water filling solenoid valve 32 do not operate properly due to the influence of foreign matter.

[0024] The first check valve 35 and the second check valve 36 are provided in series on the downstream side (the bathtub 2 side) of the hot water filling solenoid valve 32. The first check valve 35 located on the hot water filling solenoid valve 32 side among the two check valves includes a valve body 35a that can move to open and close the hot water supply passage 31, and a closing spring 35b that biases the valve body 35a in the closing direction to close the hot water supply passage 31. When the pressure of the hot water supplied from the hot water supply device 10 increases due to the opening of the hot water filling solenoid valve 32 and exceeds a predetermined opening pressure, the valve body 35a moves in the opening direction against the biasing force of the closing spring 35b, and the first check valve 35 is in an open state. Also, the second check valve 36 located on the bathtub 2 side among the two check valves is basically configured in the same way as the first check valve 35 and is biased in the closing direction. When the pressure of the hot water supplied from the hot water supply device 10 exceeds a predetermined opening pressure due to the opening of the hot water filling solenoid valve 32 and the first check valve 35, it becomes an open state. That is, as the hot water filling solenoid valve 32 is opened, the first check valve 35 and the second check valve 36 become open states and allow the hot water to pass through, so that the bathtub 2 is filled with hot water.

[0025] On the other hand, when the pressure of the hot water supplied from the water heater 10 decreases below a predetermined valve opening pressure due to reasons such as water cut-off during the water filling process, the valve body 35a is pushed back in the valve closing direction by the biasing force of the closing spring 35b, and the first check valve 35 is in a closed state. Also, the second check valve 36 similarly becomes closed, thereby preventing the backflow of hot water from the bathtub 2 side to the water heater 10 side. By installing two check valves (the first check valve 35 and the second check valve 36) in series in this way, the effect of preventing the backflow of hot water can be enhanced compared to the case where there is only one check valve.

[0026] In addition, an atmosphere release passage 37 is provided branching from the hot water supply passage 31 between the first check valve 35 and the second check valve 36, and an atmosphere release valve 38 is installed so as to be able to open and close this atmosphere release passage 37. The atmosphere release valve 38 is partitioned into a primary chamber 38b and a secondary chamber 38c by a diaphragm 38a. A pressure detection passage 39 branched from the upstream side (water heater 10 side) of the filter 34 in the hot water supply passage 31 is connected to the primary chamber 38b, and the atmosphere release passage 37 is connected to the secondary chamber 38c. Further, in the secondary chamber 38c, a valve body 38d supported by the diaphragm 38a and an opening spring 38e that biases the diaphragm 38a and the valve body 38d toward the primary chamber 38b are provided, and a discharge passage 38f opened to the atmosphere is connected.

[0027] When hot water is being normally supplied from the water supply device 10, compared to the pressure (primary pressure) of the hot water in the pressure detection passage 39 that branches off from the hot water supply passage 31 upstream of the filter 34, the pressure (secondary pressure) of the hot water in the atmosphere release passage 37 that branches off from the hot water supply passage 31 through the filter 34, the flow rate sensor 33, the hot water solenoid valve 32, and the first check valve 35 has decreased due to pressure loss. Since the primary pressure is higher than the secondary pressure by a specified value or more, the diaphragm 38a and the valve body 38d are pushed into the secondary chamber 38c side against the biasing force of the valve opening spring 38e, so the atmosphere release valve 38 is in a closed state. On the other hand, when the supply of hot water from the water supply device 10 stops due to water cut-off or the like and the primary pressure decreases and the pressure difference with respect to the secondary pressure becomes less than the specified value, the diaphragm 38a and the valve body 38d are pushed back to the primary chamber 38b side by the biasing force of the valve opening spring 38e, and the atmosphere release valve 38 becomes open. Therefore, the hot water between the first check valve 35 and the second check valve 36 is discharged from the discharge passage 38f and replaced by the inflow of air. Therefore, even if the closing of the first check valve 35 or the second check valve 36 is incomplete, it is possible to prevent the backflow of hot water from the bathtub 2 side to the water supply device 10 side.

[0028] Furthermore, in the hot water control device 30 of the present embodiment, a first joint part 31j is provided between the branch point of the atmosphere release passage 37 in the hot water supply passage 31 and the first check valve 35, and a second joint part 39j is provided in the pressure detection passage 39. These first joint part 31j and second joint part 39j are joined so as to be separable.

[0029] Fig. 2(b) shows the separated state before joining the first joint portion 31j and the second joint portion 39j. As shown in the figure, the hot water supply control device 30 of this embodiment can be divided into an upstream unit 30A including a hot water supply solenoid valve 32, a flow rate sensor 33, a filter 34, and a first check valve 35, and a downstream unit 30B including a second check valve 36 and an atmosphere release valve 38. The first joint portion 31j in the hot water supply passage 31 is joined by inserting the first male end portion 31a of the upstream unit 30A into the first female end portion 31b of the downstream unit 30B. Also, the second joint portion 39j in the pressure detection passage 39 is joined by inserting the second male end portion 39a of the downstream unit 30B into the second female end portion 39b of the upstream unit 30A. And the insertion direction of the first joint portion 31j and the insertion direction of the second joint portion 39j are parallel.

[0030] Fig. 3 is an explanatory diagram showing a state of joining the first joint portion 31j and the second joint portion 39j when assembling the hot water supply control device 30 of this embodiment. The figure shows a cross-section of the hot water supply control device 30 cut along a plane including the center line of the hot water supply passage 31 and the center line of the pressure detection passage 39. Since the focus is mainly on the first joint portion 31j of the hot water supply passage 31 and the second joint portion 39j of the pressure detection passage 39, illustrations of the hot water supply solenoid valve 32, the flow rate sensor 33, the filter 34, the first check valve 35, the second check valve 36, the atmosphere release passage 37, and the atmosphere release valve 38 are omitted.

[0031] When assembling the hot water supply control device 30, when the upstream unit 30A and the downstream unit 30B are brought closer, first, as shown in Fig. 3(a), the second male-side end portion 39a starts to enter the second female-side end portion 39b at the second joint portion 39j of the pressure detection passage 39. At this time, at the first joint portion 31j of the hot water supply passage 31, the distance between the first male-side end portion 31a and the first female-side end portion 31b is separated and has not entered yet. Therefore, the assembler does not need to worry about the alignment of the insertion of the first joint portion 31j and only needs to pay attention to the alignment of the insertion of the second joint portion 39j. As shown in the figure, a first O-ring 31c is fitted on the outer periphery of the first male-side end portion 31a as a seal member. Similarly, a second O-ring 39c is fitted on the outer periphery of the second male-side end portion 39a as a seal member.

[0032] Subsequently, when the upstream unit 30A and the downstream unit 30B are brought closer further, as shown in Fig. 3(b), the first male-side end portion 31a starts to enter the first female-side end portion 31b at the first joint portion 31j of the hot water supply passage 31. At that time, at the second joint portion 39j of the pressure detection passage 39, since the second male-side end portion 39a has already been inserted into the second female-side end portion 39b and alignment is not necessary, the assembler only needs to pay attention to the alignment of the insertion of the first joint portion 31j.

[0033] In the state where the first joint portion 31j and the second joint portion 39j are joined in this way and the hot water supply control device 30 is assembled, as shown in Fig. 3(c), the insertion amount L1 of the first joint portion 31j and the insertion amount L2 of the second joint portion 39j are different and not the same. That is, in the hot water supply control device 30 of this embodiment, in addition to the insertion direction of the first joint portion 31j and the insertion direction of the second joint portion 39j being arranged in parallel, the insertion amount L2 of the second joint portion 39j is set to be longer than the insertion amount L1 of the first joint portion 31j.

[0034] FIG. 4 is an explanatory view showing an enlarged view of the second joint portion 39j of this embodiment. First, FIG. 4(a) shows a perspective view of the divided state before joining the second joint portion 39j. As shown in the figure, a flange is formed on the second male-side end portion 39a of this embodiment by expanding the outer periphery of the tip, and the above-described second O-ring 39c is fitted. Further, it has a flange portion 39d projecting from the outer periphery with the second O-ring 39c sandwiched between the tip of the second male-side end portion 39a and the flange. In FIG. 4(a), the second O-ring 39c is represented with hatching.

[0035] On the other hand, in the second female-side end portion 39b of this embodiment, insertion holes 39f for inserting a substantially U-shaped connection pin 39e in a direction orthogonal to the insertion direction of the second male-side end portion 39a are formed at two locations above and below in the figure. The second joint portion 39j is fastened by inserting the connection pin 39e into the insertion hole 39f after inserting the second male-side end portion 39a into the second female-side end portion 39b. Although illustration is omitted, the first joint portion 31j is fastened using screws or quick fasteners after inserting the first male-side end portion 31a into the first female-side end portion 31b.

[0036] FIG. 4(b) shows a cross-sectional view of the state where the second joint portion 39j is joined. In the figure, it represents a cross-section cut along a plane including the center line of the pressure detection passage 39. As shown in the figure, in the second female-side end portion 39b of this embodiment, a seal portion 39g interposing the second O-ring 39c between the inserted second male-side end portion 39a and a step between the seal portion 39g and a diameter-expanded portion 39h whose inner diameter is expanded on the inlet side (the left side in the figure) are provided. Such a diameter-expanded portion 39h functions as a guide when inserting the second male-side end portion 39a into the second female-side end portion 39b, and since the allowable range of alignment is widened, the assembly of the hot water supply control device 30 becomes easier compared to the case where the diameter-expanded portion 39h is not provided.

[0037] In addition, an insertion hole 39f (not shown in FIG. 4(b)) is provided in the enlarged diameter portion 39h. When the connection pin 39e is inserted into the insertion hole 39f, the second male-side end portion 39a is prevented from coming off by the engagement between the connection pin 39e and the flange portion 39d. With such engagement between the connection pin 39e and the flange portion 39d, play due to the gap between the connection pin 39e and the flange portion 39d can be ensured in the insertion direction of the second joint portion 39j. Therefore, the assembly margin of the entire hot water expansion control device 30 increases compared to fixing by screwing or the like. As a result, even if there are variations in the components of the hot water expansion control device 30, the variations can be absorbed (adjusted) by the play of the second joint portion 39j, making the assembly of the hot water expansion control device 30 easier.

[0038] In the hot water expansion control device 30 of this embodiment, since the insertion direction of the first joint portion 31j and the insertion direction of the second joint portion 39j are parallel, if the first joint portion 31j is fixed by screwing or the like, it may be considered that fastening of the second joint portion 39j is not necessary in the first place. However, if the fastening of the second joint portion 39j is omitted, it is assumed that the second joint portion 39j may come off when the pressure of the hot water in the pressure detection passage 39 suddenly increases due to a so-called water hammer. Therefore, if the second joint portion 39j is fastened with the connection pin 39e, it is possible to provide for the water hammer while ensuring play in the insertion direction.

[0039] As described above, in the hot water expansion control device 30 of this embodiment, the hot water supply passage 31 can be divided between the branch point of the atmosphere release passage 37 and the first check valve 35, and has a first joint portion 31j in which the first male-side end portion 31a is inserted into and joined to the first female-side end portion 31b. Also, the pressure detection passage 39 can be divided and has a second joint portion 39j in which the second male-side end portion 39a is inserted into and joined to the second female-side end portion 39b. The insertion direction of the first joint portion 31j and the insertion direction of the second joint portion 39j are arranged in parallel, and the insertion amount L2 at the time of joining of the second joint portion 39j is set longer than the insertion amount L1 at the time of joining of the first joint portion 31j.

[0040] In the assembly operation of the hot water filling control device 30 of this embodiment, when the second male-side end portion 39a starts to enter the second female-side end portion 39b at the second joint portion 39j with a long insertion amount, there is a gap between the first male-side end portion 31a and the first female-side end portion 31b at the first joint portion 31j with a short insertion amount and it has not yet entered. Therefore, the operator only needs to pay attention to the alignment of the insertion of the second joint portion 39j. After that, when the first male-side end portion 31a starts to enter the first female-side end portion 31b at the first joint portion 31j, the second male-side end portion 39a has already been inserted into the second female-side end portion 39b at the second joint portion 39j and there is no need for alignment. Therefore, only the alignment of the insertion of the first joint portion 31j needs to be paid attention to. Compared with the case where the alignment of the insertion is performed simultaneously with the two of the first joint portion 31j and the second joint portion 39j, the assembly of the hot water filling control device 30 can be facilitated.

[0041] In particular, in the hot water filling control device 30 of this embodiment, a seal portion 39g that interposes a second O-ring 39c between the second female-side end portion 39b of the second joint portion 39j with a long insertion amount and the second male-side end portion 39a to be inserted, and a diameter-expanded portion 39h that expands the inner diameter on the inlet side of the seal portion 39g are provided. In such a second joint portion 39j, when the second male-side end portion 39a starts to enter the second female-side end portion 39b, the diameter-expanded portion 39h functions as a guide and the allowable range of alignment expands. Therefore, compared with the case where the diameter-expanded portion 39h is not provided, the assembly of the hot water filling control device 30 can be facilitated.

[0042] Also, in the hot water filling control device 30 of this embodiment, in the joined state of the second joint portion 39j, the second male-side end portion 39a is prevented from coming off by the engagement between the connection pin 39e inserted in a direction orthogonal to the insertion direction and the flange portion 39d protruding from the outer periphery of the second male-side end portion 39a. Compared with fixing by screwing or the like, in the case of the engagement between the connection pin 39e and the flange portion 39d, play due to the gap between the connection pin 39e and the flange portion 39d can be ensured in the insertion direction of the second joint portion 39j. Therefore, the margin of assembly increases for the entire hot water filling control device 30. Thus, even if there are variations in the components of the hot water filling control device 30, the variations can be absorbed (adjusted) by the play of the second joint portion 39j, and the assembly of the hot water filling control device 30 can be facilitated.

[0043] As described above, the hot water filling control device 30 of this embodiment has been described. However, the present invention is not limited to the above-described embodiment, and can be implemented in various modes without departing from the gist thereof.

[0044] For example, in the above-described embodiment, the first male-side end portion 31a in the first joint portion 31j is provided in the upstream unit 30A, and the first female-side end portion 31b is provided in the downstream unit 30B. However, conversely, the first male-side end portion 31a may be provided in the downstream unit 30B, and the first female-side end portion 31b may be provided in the upstream unit 30A. Similarly, in the above-described embodiment, the second male-side end portion 39a in the second joint portion 39j is provided in the downstream unit 30B, and the second female-side end portion 39b is provided in the upstream unit 30A. However, conversely, the second male-side end portion 39a may be provided in the upstream unit 30A, and the second female-side end portion 39b may be provided in the downstream unit 30B.

[0045] In the above-described embodiment, the first joint portion 31j was disposed between the branch point of the atmosphere release passage 37 in the hot water supply passage 31 and the first check valve 35. However, the first joint portion 31j may be disposed upstream of the branch point of the atmosphere release passage 37 (on the side of the hot water expansion electromagnetic valve 32), and may be disposed between the first check valve 35 and the hot water expansion electromagnetic valve 32. For example, it can be appropriately changed for design reasons such as incorporating the first check valve 35 from the first male-side end portion 31a or incorporating it from the first female-side end portion 31b.

[0046] In the above-described embodiment, the insertion amount L2 of the second joint portion 39j of the pressure detection passage 39 was set to be longer than the insertion amount L1 of the first joint portion 31j of the hot water supply passage 31. However, conversely, the insertion amount L1 of the first joint portion 31j of the hot water supply passage 31 may be set to be longer than the insertion amount L2 of the second joint portion 39j of the pressure detection passage 39. In this case, contrary to the above-described embodiment, in the assembly work of the hot water expansion control device 30, first, attention only needs to be paid to the alignment of the insertion of the first joint portion 31j, and then attention only needs to be paid to the alignment of the insertion of the second joint portion 39j. However, generally, since the second joint portion 39j of the pressure detection passage 39 has a smaller diameter than the first joint portion 31j of the hot water supply passage 31, if the insertion amount L2 of the second joint portion 39j is increased as in the above-described embodiment, it is possible to make the hot water expansion control device 30 more compact than when the first joint portion 31j is made longer.

[0047] In the above-described embodiment, a step between the seal portion 39g and the diameter-expanded portion 39h was provided at the second female-side end portion 39b. However, the diameter-expanded portion 39h may have a tapered shape that continuously expands from the seal portion 39g.

[0048] Furthermore, in the above-described embodiment, the seal portion 39g and the diameter-expanded portion 39h were provided at the second female-side end portion 39b. However, the diameter-expanded portion 39h is not essential, and the insertion amount of the second joint portion 39j may be made longer than the insertion amount of the first joint portion 31j by extending the seal portion 39g with the same diameter.

Explanation of Reference Numerals

[0049] 1…Hot water supply system, 2…Bathtub, 10…Hot water supply device, 11…Burner, 12…Combustion chamber, 13…Gas passage, 14…Gas solenoid valve, 15…Combustion fan, 16…Heat exchanger, 17…Water supply passage, 18…Water flow sensor, 20…Hot water outlet passage, 21…Hot water faucet, 22…Hot water supply passage, 30…Hot water supply control device, 30A…Upstream unit, 30B…Downstream unit, 31…Hot water supply passage, 31a…First male end, 31b…First female end, 31c…First O-ring, 31j…First joint part, 32…Hot water supply solenoid valve, 33…Flow sensor, 34…Filter, 35…First check valve, 35a…Valve body, 35b…Closing valve spring, 36…Second check valve, 37…Atmospheric release passage, 38…Atmospheric release valve, 38a…Diaphragm, 38b…Primary chamber, 38c…Secondary chamber, 38d…Valve body, 38e…Opening valve spring, 38f…Discharge passage, 39…Pressure detection passage, 39a…Second male end, 39b…Second female end, 39c…Second O-ring, 39d…Flange part, 39e…Connection pin, 39f…Insertion hole, 39g…Sealing part, 39h…Diameter-expanded part, 39j…Second joint part.

Claims

1. In a hot water filling control device provided in a hot water filling passage for supplying hot water from a water heater to a bathtub and controlling the hot water filling of the bathtub, a solenoid valve that forms part of the hot water filling passage and opens and closes a hot water supply passage for guiding hot water from the water heater side to the bathtub side; Two check valves are provided in series on the bathtub side of the solenoid valve. They are biased in the valve closing direction to close the hot water supply passage, and open when the pressure of the hot water supplied from the water heater exceeds a predetermined valve opening pressure due to the opening of the solenoid valve; An air release passage branched from between the two check valves of the hot water supply passage is provided so as to be openable and closable, and is biased in the valve opening direction by an opening spring. A pressure detection passage branched from the water heater side of the solenoid valve in the hot water supply passage is connected thereto. When the pressure of the hot water in the pressure detection passage is higher than the pressure of the hot water in the air release passage by a specified value or more, it closes against the biasing force of the opening spring. On the contrary, when the pressure of the hot water in the pressure detection passage decreases and the pressure difference with respect to the pressure of the hot water in the air release passage becomes less than the specified value, it opens by the biasing force of the opening spring and discharges the hot water between the two check valves. An air release valve; Comprising: The hot water supply passage can be divided on the solenoid valve side of the branch point of the air release passage in the hot water supply passage, and has a first joint part where the male side is inserted into the female side and joined; The pressure detection passage can be divided and has a second joint part where the male side is inserted into the female side and joined; In addition to the insertion direction of the first joint part and the insertion direction of the second joint part being arranged in parallel; Among the first joint part and the second joint part, the insertion amount during the joining of either one is set to be longer than the insertion amount during the joining of the other. A hot water filling control device characterized by the above.

2. In the hot water filling control device according to Claim 1, On the female side of either one of the first joint part and the second joint part with a long insertion amount during joining, a seal part for interposing a seal member between the male side of the joint part to be inserted and the female side, and a diameter-expanded part with an expanded inner diameter on the inlet side of the seal part are provided. A hot water filling control device characterized by the above.

3. In the hot water filling control device according to Claim 1 or Claim 2, Either one of the first joint part and the second joint part with a long insertion amount during joining is prevented from coming off by the engagement between a connection pin inserted in a direction perpendicular to the insertion direction in the joined state and a flange part protruding from the outer periphery of the male side. A hot water filling control device characterized by the above.

4. In the hot water filling control device according to Claim 1, the insertion amount at the time of joining the second joint part is set to be longer than the insertion amount at the time of joining the first joint part A hot water filling control device characterized by the above.

Images