JP5891710B2 - Valve device and hot water supply device - Google Patents

Description

  The present invention relates to a valve device and a hot water supply device including the valve device.

  When the water heater provided with the valve device stops, residual water is generated inside the valve device. Residual water inside the valve device may freeze in winter when the temperature is low. And the valve apparatus may be damaged when the residual water inside the valve apparatus freezes.

  Techniques for discharging residual water inside the valve device to prevent freezing are disclosed in, for example, Japanese Patent Application Laid-Open No. 7-213450 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2006-105334 (Patent Document 2).

  In the shower device disclosed in Japanese Patent Laid-Open No. 7-213450, the flow regulating water valve is closed by an instruction to end shower water discharge. Thereafter, the switching valve driving device automatically switches the switching valve to the drain side water outlet side. At that time, since the switching valve is open on the shower channel side, the remaining hot water in the shower channel flows and drains into the drain side discharge port by the head pressure.

  In the water discharge path switching device disclosed in Japanese Patent Application Laid-Open No. 2006-105334, a drain valve is provided at the tip of a shaft provided with a valve body. When the valve body moves and the water discharge direction is switched to the first water discharge port, the drain valve is opened and the remaining water in the apparatus is drained.

JP-A-7-213450 JP 2006-105334 A

  The shower device disclosed in JP-A-7-213450 and the water discharge path switching device disclosed in JP-A-2006-105334 both relate to a configuration in which a shaft provided with a valve body is slid. Accordingly, there is no disclosure in the above-mentioned two publications of draining the remaining water in the valve device that opens and closes only by rotating the shaft without sliding the shaft provided with the valve body.

  The present invention has been made in view of the above problems, and its purpose is to open and close only by rotation of a shaft provided with a valve body, and to prevent freezing by draining residual water inside the valve device. A valve device that can be used, and a hot water supply device including the valve device.

The valve device of the present invention is operable in accordance with an input command, and includes a valve body, a shaft body, a first valve body, a second valve body, a first shielding portion, 2 shielding portions . The valve main body includes a flow path having a first opening, and a second opening and a third opening arranged so as to sandwich the first opening. The shaft body is disposed in the flow path of the valve body and is configured to be rotatable about the axis. The first valve body is connected to the shaft body so as to be positioned between the first opening and the second opening in the flow path, and the first notch has a disc shape centered on the axis. It has a formed shape. The second valve body is connected to the shaft body so as to be positioned between the first opening and the third opening in the flow path, and the second notch is formed in a disk shape centering on the axis. Has the shape. The 1st shielding part is arranged along with the 1st valve element in the direction where an axis extends so that it may be located between the 1st opening and the 2nd opening in a channel. The 2nd shielding part is arranged along with the 2nd valve element in the direction where an axis extends so that it may be located between the 1st opening and the 3rd opening in a channel. The first and second valve bodies can be opened and closed by the rotation of the first and second valve bodies about the axis, and the axis is centered by an input command. As a result of the rotation of the shaft, the entire first notch is covered with the first shielding part, the first notch is fully closed, and the entire second notch is not covered with the second shielding part . After the two notches are positioned so as to be fully opened, at least a part of the first notch is covered with the first shielding part by rotation of the shaft body about the axis , and the remaining part is the first shielding part. Stop so that the first notch opens without being covered .

  According to the valve device of the present invention, the first and second valve bodies can be opened and closed by the rotation of the first and second valve bodies about the axis. For this reason, the opening / closing operation can be performed only by the rotation of the shaft body to which the first and second valve bodies are connected.

  In addition, after the first and second valve bodies are positioned so that the first notch is fully closed and the second notch is fully opened by the rotation of the shaft body around the axis according to the input command, The shaft is stopped so that at least the first notch is opened by the rotation of the shaft around the axis. Since at least the first notch is opened, fluid can flow between the first opening and the second opening. Thereby, the residual water inside the valve device can be drained to prevent freezing.

  Further, the driving means for rotating the shaft body may be out of step unless the zero point adjustment is periodically performed. Therefore, in the valve device of the present invention, the first and second valve bodies are positioned so that the first notch is fully closed and the second notch is fully opened after the stop command. Thereby, the zero point adjustment becomes possible after the stop command. For this reason, step-out can be prevented by adjusting the zero point.

  The hot water supply apparatus of the present invention includes the valve device described above, a heat exchanger connected to the second opening, and a bypass circuit connected to the third opening.

  According to the hot water supply apparatus of the present invention, the residual water on the second opening side on the heat exchanger side where residual water is mainly generated can be drained through the first opening. Thereby, freezing can be prevented.

  In addition, since the heat exchanger side is opened after the heat exchanger side is fully closed and the bypass circuit side is fully open, if a re-bathing command is issued during the stop operation, the re-bathed hot water will not become hot. can do.

  As described above, according to the present invention, a valve device that can be opened and closed only by rotation of a shaft provided with a valve body, and that can drain water remaining inside the valve device to prevent freezing, and a hot water supply provided with the valve device. A device can be obtained.

It is a perspective view which shows roughly the structure of the valve apparatus in one embodiment of this invention, a stepping motor, etc. FIG. It is a figure which shows roughly the cross section of the valve apparatus part in the valve apparatus shown in FIG. 1, a stepping motor, etc. FIG. It is a disassembled perspective view which shows schematically the structure of the valve apparatus shown in FIG. It is a figure for demonstrating the shape of the 1st and 2nd valve body used for the valve apparatus shown in FIG. It is a perspective view which shows roughly the structure of the spacer used for the valve apparatus shown in FIG. 1 from the lower side. FIG. 2 is a perspective view schematically showing a configuration of a shaft body, a valve body, a spacer and the like used in the valve device shown in FIG. 1. It is a fracture | rupture perspective view of the valve main body used for the valve apparatus shown in FIG. It is sectional drawing which shows a mode that the spacer was fixed to the valve main body in the valve apparatus shown in FIG. It is sectional drawing for demonstrating the radial clearance between a valve body and the flow-path wall surface inside a valve main body in the valve apparatus shown in FIG. It is a figure which shows schematically the structure of the hot water supply apparatus using the valve apparatus and stepping motor which are shown in FIG. It is a figure for demonstrating operation | movement of the valve apparatus shown in FIG. It is a figure for demonstrating operation | movement of the hot water supply apparatus shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, the configuration of the valve device and the stepping motor according to the present embodiment will be described with reference to FIGS.

  Referring mainly to FIG. 1, a stepping motor 2 is attached and fixed to the valve device 1 of the present embodiment. As will be described later, the stepping motor 2 is configured so that the shaft body and the valve body in the valve device 1 can be rotationally driven. A control unit 40 is connected to the stepping motor 2. A switch 41 is connected to the control unit 40.

  Referring mainly to FIGS. 2 and 3, the valve device 1 of the present embodiment includes a valve body 11, a shaft body 12, first and second valve bodies 13a and 13b, a spacer 14, and a valve. It mainly has a collar 15 and O-rings 16a and 16b.

  The valve body 11 has a flow path 11A inside. The flow path 11A has a first opening 11a, and a second opening 11b and a third opening 11c arranged so as to sandwich the first opening 11a.

  When the valve device 1 is a distribution valve, the first opening 11a is, for example, an inlet of fluid (for example, hot water), and each of the second and third openings 11b, 11c is, for example, a flow of fluid. It is an exit. When the valve device 1 is a mixing valve, the first opening 11a is, for example, an outlet for fluid, and each of the second and third openings 11b, 11c is, for example, an inlet for fluid.

  Further, the fourth opening 11d may be formed so as to communicate with the flow path 11A. When the valve device 1 is a distribution valve, the fourth opening portion 11d is preferably a fluid outlet.

  The shaft body 12 is disposed in the flow path 11A of the valve body 11, and is configured to be rotatable about a virtual axis CC. That is, the shaft body 12 can be rotated about the axis C-C by being supported by the valve body 11 via the valve collar 15 attached to the outer peripheral portion on one end side of the shaft body 12.

  An O-ring 16 a is disposed between the shaft body 12 and the valve collar 15, and an O-ring 16 b is disposed between the valve collar 15 and the valve body 11. Further, the stepping motor 2 is connected to one end of the shaft body 12 so that the shaft body 12 is given a rotational driving force by a stepping motor (drive source) 2. The stepping motor 2 is fixedly attached to the valve body 11 with a servo mounting plate 3 interposed.

  A control unit 40 capable of controlling the rotation of the stepping motor 2 is connected to the stepping motor 2. The control unit 40 is configured to be able to control the rotation of the shaft body 12 by controlling the rotation of the stepping motor 2. A switch 41 capable of operating the control unit 40 is connected to the control unit 40. The switch 41 is configured to be able to operate the rotation of the stepping motor 2 by operating the control unit 40.

  Each of the first and second valve bodies 13 a and 13 b is attached to the shaft body 12. The first valve body 13a is located between the first opening 11a and the second opening 11b in the flow path 11A. The second valve body 13b is located between the first opening 11a and the third opening 11c in the flow path 11A.

Referring mainly to FIG. 4, the first valve body 13 a has a shape in which the first notch 13 a ₁ is formed in a disk shape centered on the axis C-C. The first notch 13a ₁ is provided in an angular range of about 180 ° around the center O of the disc-shaped first valve body 13a. A portion 13a ₂ of the first valve body 13a in which the first notch 13a ₁ is not provided has an arc shape. Further, the portion of the first valve body 13a provided with the first notch 13a ₁ has an outer shape resembling an involute curve, for example.

Similarly to the first valve body 13a, the second valve body 13b has a shape in which the second notch 13b ₁ is formed in a disk shape with the axis C-C as the center O. The second notch 13b ₁ is provided in an angular range of about 180 ° around the center O of the disc-shaped second valve body 13b. A portion 13b ₂ of the second valve body 13b in which the second notch 13b ₁ is not provided has an arc shape. The portion of the second valve body 13b provided with the second notch 13b ₁ has an outer shape resembling an involute curve, for example.

The first and second valve bodies 13a and 13b are operated to open and close the first and second notches 13a ₁ and 13b ₁ by the rotation of the first and second valve bodies 13a and 13b about the axis C-C. Is configured to be possible. The first and second valve body 13a, 13b, depending the input instruction, the first notch 13a ₁ by the rotation of the shaft 12 about the axis C-C is fully closed and the second notch After being positioned so that 13b ₁ is fully opened, it is configured to be controllable by the control unit 40 so as to stop so as to open at least the first notch 13a ₁ by the rotation of the shaft body 12 around the axis C-C. Yes.

Specifically first and second notches 13a _1, 13b _1, when rotating the shaft body 12 in the arrow RD direction in FIG. 4, the first and second notches 13a _1, each of 13b ₁ It has a shape such that the change in the area of the portion opened from the first and second shielding portions 14 a and 14 b is proportional to the square of the rotation angle of the shaft body 12.

Since both the first and second valve bodies 13a and 13b are attached to one shaft body 12, the center O of the first valve body 13a and the center O of the second valve body 13b are the same axis. It is located on (straight line) CC. The radius R1 from the center O of the arc portion 13a ₂ of the first valve body 13a may be the same as or different from the radius R2 from the center O of the arc portion 13b ₂ of the second valve body 13b. Also good. In the present embodiment, the radius R1 is smaller than the radius R2.

The first notch 13a ₁ is preferably arranged so as to be point-symmetric with respect to the second notch 13b ₁ with the axis C-C as the center O when viewed from the direction of the axis CC. . As described above, in the present embodiment, when the radius R1 is smaller than the radius R2, the shape of the first valve body 13a viewed from the direction of the axis CC is the shape of the second valve body 13b. It has a similar shape.

  Referring mainly to FIGS. 3 and 5, the spacer 14 mainly includes first and second shielding portions 14a and 14b, a connecting portion 14c, and two convex engaging portions 14d. . Each of the first and second shielding portions 14a and 14b has, for example, a semicircular shape. The connecting portion 14 c is a portion connected to both the first and second shielding portions 14 a and 14 b and has a semi-cylindrical portion that covers the outer peripheral surface along the outer peripheral surface of the shaft body 12. .

  A through hole 14e extending in a direction orthogonal to the axis C-C direction is formed in the connecting portion 14c. The two convex engaging portions 14d are disposed at both end portions of the connecting portion 14c, respectively, and protrude toward the outer peripheral side from the outer peripheral end portions of both the first and second shielding portions 14a and 14b. It extends in the CC direction.

  Referring mainly to FIGS. 2 and 6, the spacer 14 is sandwiched between the first valve body 13a and the second valve body 13b, and the second valve body 13b is inserted into the through hole 14e. By doing so, it is attached to the shaft body 12. In this attached state, the semi-cylindrical portion of the connecting portion 14 c covers the outer peripheral surface along the outer peripheral surface of the shaft body 12. In this attached state, the first and second shielding portions 14a and 14b are located in the same direction with respect to the axis CC.

By rotating the shaft body 12 with respect to the spacer 14 in this attached state, the first notch 13a ₁ can be opened and closed by the first shielding part 14a, and the second notch 13b ₁ is opened by the second shielding part. It can be opened and closed at 14b. The first and second cutouts 13a ₁ and 13b ₁ are positioned in different directions with respect to the axis CC, and the first and second shielding portions 14a and 14b are the same with respect to the axis CC. Since it is located in the direction, the second shielding part 14b can open the second notch 13b ₁ when the first shielding part 14a closes the first notch 13a ₁ . Conversely, when the first shielding portion 14a is open the first notch 13a _1, the second shielding portion 14b can also be closed second notch 13b _1.

  Referring mainly to FIGS. 7 and 8, a linear groove extending in the direction in which axis C-C extends is formed in the wall surface of flow path 11 </ b> A of valve body 11 (hereinafter also referred to as “flow path wall surface”). 11e is formed. The spacer 14 can be fixed to the flow channel wall surface by being inserted into the flow channel 11A while being guided by the groove 11e in a state where the convex engagement portion 14d is fitted in the groove 11e. That is, in the state where the spacer 14 is inserted into the flow path 11A, each of the convex engaging portions 14d on both sides of the spacer 14 is fitted in the groove 11e, so that the shaft body 12 rotates about the axis C-C. Even so, the spacer 14 does not rotate with the shaft body 12.

  Referring mainly to FIGS. 7 and 9, a groove 11 f is formed in the flow passage wall surface of the valve body 11 to extend in the angular range of about 180 ° along the circumferential direction.

The size L1 of the radial gap between the arc portion 13a ₂ of the first valve body 13a shown in FIG. 2 and the flow path wall surface is different from that of the arc portion 13b ₂ of the second valve body 13b shown in FIG. It is preferable that it is larger than the size L2 of the radial gap between the road wall surface.

To larger than the size L2 of the gap the gap size L1, arcuate portion 13b ₂ of the radius R1 of the arcuate portion 13a ₂ of the first valve body 13a as shown in FIG. 4 is a second valve body 13b The radius 11 may be smaller than the radius R2, and a groove 11f extending in the circumferential direction may be formed on the flow path wall surface of the portion where the first valve body 13a is located as shown in FIG. Further, the configuration in which the radius R1 is smaller than the radius R2 and the configuration in which the groove 11f is formed may be combined.

  Note that the first, second, and fourth openings 11a, 11b, and 11d are provided in a direction orthogonal to the axis C-C, and the third opening 11c is provided in a parallel direction. It is preferable.

  The valve body 11, the shaft body 12, the first and second valve bodies 13a and 13b, the spacer 14 and the valve collar 15 are made of a resin such as PPS (polyphenylene sulfide), and the servo mounting plate 3 is made of zinc, for example. It consists of a plated steel sheet. The first and second valve bodies 13a and 13b may be formed integrally with the shaft body 12, or are separate from the shaft body 12 and are attached and fixed to the shaft body 12. May be.

  Next, the structure of the hot water supply device having the valve device 1 of the present embodiment will be described with reference to FIG.

  Referring to FIG. 10, hot water supply device 20 includes valve device 1, stepping motor 2, heat exchanger 21, bypass circuit 22, combustion burner 23, blower 24, water supply pipe 31, and hot water supply pipe 32. And mainly includes a control unit 40 and a switch 41.

  The hot water supply device 20 may have a remote controller 42. The remote controller 42 is configured to be able to operate the switch 41 by wireless communication, for example. In this case, the switch 41 has a receiver, and the remote controller 42 has a transmitter that can communicate with the receiver. In addition, the remote controller 42 and the hot water supply device 20 may be connected by a wired communication cable or the like.

  In the hot water supply device 20, the valve device 1 is configured to be operable in accordance with an input command. In the hot water supply device 20, the valve device 1 can be operated by rotating the stepping motor 2 according to a command from the control unit 40.

  Connected to the heat exchanger 21 are a water supply pipe 31 for supplying water to the heat exchanger 21 and a hot water supply pipe 32 for discharging hot water from the heat exchanger. A bypass circuit (bypass pipe) 22 connects the water supply pipe 31 and the hot water supply pipe 32.

  The heat exchanger 21 exchanges heat with the combustion gas generated in the combustion burner 23, and the blower 24 supplies the combustion burner 23 with air necessary for combustion. The valve device 1 of the present embodiment having the configuration shown in FIGS. 1 to 9 is connected to, for example, a connection portion between the water supply pipe 31 and the bypass circuit 22.

  Referring mainly to FIGS. 2 and 10, the first opening 11 a of the valve device 1 is connected to the water supply side portion 31 a of the water supply pipe 31, and the second opening 11 b is a heat exchange of the water supply pipe 31. It is connected to the vessel side portion 31b. The third opening 11 c is connected to the bypass circuit 22. Note that the fourth opening 11d is provided in a backflow prevention valve (not shown) having a water pressure inlet included in the hot water supply device with a remedy when the valve device 1 is used in the hot water supply device with a remedy. It is preferable to be connected.

  In the hot water supply device 20, the valve device 1 is disposed at the connection portion between the water supply pipe 31 and the bypass circuit 22, so that the distribution ratio to the heat exchanger 21 and the bypass circuit 22 can be adjusted by the valve device 1. it can.

  That is, in the hot water supply device 20, the water entering the device is once distributed to the heat exchanger 21 side and the bypass circuit 22 side, and the high-temperature water that has passed through the heat exchanger 21 and the low-temperature water that has passed through the bypass circuit 22 are separated. The desired tapping temperature is obtained by mixing. At this time, by adjusting the distribution ratio by the valve device 1, it becomes possible to control to a desired tapping temperature.

  Next, operation | movement of the valve apparatus 1 of this Embodiment is demonstrated using FIG. 11 (A)-FIG. 11 (C).

Referring to FIG. 11A, in this state, the entire second notch 13b ₁ of the second valve body 13b is not covered by the second shielding portion 14b and is open (fully opened), and The entire _first notch 13a ₁ of the first valve body 13a is covered with the first shielding portion 14a and closed (fully closed). In this state, as shown in FIG. 2, a fluid (for example, hot water) can flow between the first opening 11a and the third opening 11c, and the first opening 11a and the second opening. The fluid flow is blocked from the part 11b.

Of the portions where the first and second cutouts 13a ₁ and 13b ₁ are formed, the open portions that are not covered by the first and second shielding portions 14a and 14b are hatched in the drawing. . This hatching is similarly applied to FIGS. 11B and 11C.

Referring to FIG. 11B, this state is a state in which the shaft body 12 is rotated about 90 ° clockwise as shown by an arrow RD from the state of FIG. In this state, a part of the first notch 13a ₁ of the first valve body 13a is covered with the first shielding part 14a, but the remaining part is not covered with the first shielding part 14a. is open. A part of the second notch 13b ₁ of the second valve body 13b is covered with the second shielding part 14b, but the remaining part is not covered with the second shielding part 14b and is open. . That is, a part of both the first and second cutouts 13a ₁ and 13b ₁ is open (half open). Therefore, in this state, a predetermined amount of fluid can flow between the first opening 11a and the second opening 11b, and the first opening 11a and the third opening 11c A predetermined amount of fluid can be circulated even between them.

Referring to FIG. 11C, this state is a state in which shaft body 12 is further rotated by about 90 ° clockwise as shown by arrow RD from the state of FIG. 11B. In this state, the entire second notch 13b ₁ of the second valve body 13b is covered and closed by the second shielding portion 14b (fully closed), and the first notch of the first valve body 13a is closed. The whole 13a ₁ is not covered with the first shielding part 14a and is open (fully open). In this state, as shown in FIG. 9, the flow of the main fluid between the first opening 11a and the third opening 11c is blocked, and the first opening 11a and the second opening The fluid can flow between 11b.

By rotating the shaft body 12 in this manner, the first and second cutouts 13a ₁ and 13b ₁ can be opened and closed. Thereby, the opening degree of the flow path between the 1st opening part 11a and the 2nd opening part 11b, and the opening degree of the flow path between the 1st opening part 11a and the 3rd opening part 11c, Can be adjusted. For this reason, it is possible to simultaneously control the flow rate between the first opening 11a and the second opening 11b and the flow rate between the first opening 11a and the third opening 11c. Become.

  Next, operation | movement of the hot water supply apparatus 20 of this Embodiment is demonstrated using FIG. 10 and FIG.

  Referring to FIGS. 10 and 12, when the use of hot water supply device 20 is started, the operation switch is turned on by switch 41 (step S10). When the operation switch is turned on, normal operation control is performed by the control unit 40 (step S11). In this normal operation control, the valve device 1 is operated by the control unit 40 controlling the rotation of the stepping motor 2. And the hot water is controlled to a desired temperature by adjusting the distribution ratio between the heat exchanger 21 side of the incoming water and the bypass circuit 22 side by the valve device 1.

When the use of the hot water supply device 20 is terminated, the operation switch is turned off by the switch 41 (step S12). When the operation switch is turned off, the control device 40 operates the valve device 1 so that the heat exchanger 21 side (can body side) is fully closed and the bypass circuit 22 side is fully opened as shown in FIG. Step S13). That is, in response to the stop command, the first and second valve bodies are such that the first notch 13a ₁ is fully closed and the second notch 13b ₁ is fully opened by the rotation of the shaft body 12 about the axis C-C. 13a and 13b are located. By operating the valve device 1 so that the bypass circuit 22 side is fully opened, when a re-bath instruction is issued during the stop operation, the re-bath water can be prevented from reaching a high temperature.

  The position where the bypass circuit 22 side is fully opened is set to the 0 step position. The 0 step position is a position where the rotation of the stepping motor 2 is 0 °. The hot water supply device 20 is provided with a position detection device (not shown) that can detect that the rotation of the stepping motor 2 is at a position of 0 °. By detecting that the rotation of the stepping motor 2 is at a position of 0 ° at the timing when the operation switch is turned off, the deviation (step-out) between the control value of the control unit 40 and the number of steps of the stepping motor 2 is eliminated. Zero point adjustment can be performed. When the position detection device detects that the rotation of the stepping motor 2 is at a position of 0 °, a limiter signal is transmitted to the control unit 40.

The control unit 40 determines the detection of the limiter signal (step S14). If the control unit 40 does not detect the limiter signal, a failure is displayed on the display unit (not shown) of the hot water supply device 20 (step S15). When the control unit 40 detects the limiter signal, the valve device 1 is operated so that at least the can body side of the heat exchanger 21 side (can body side) and the bypass circuit 22 side is opened (step S16). That is, the first and second valve body 13a so that at least a first notch 13a ₁ by the rotation of the shaft 12 about the axis C-C is opened, 13b is stopped. At this time, the valve body on the bypass circuit 22 side moves to an arbitrary position of about 30 ° to 180 °. Thereby, the remaining water can be drained from the valve device 1. Actual drainage may be performed by opening a drain plug (not shown) provided in the water supply side portion 31a of the water supply pipe 31 of the hot water supply device 20.

A gap is provided between the flow passage wall surface of the valve body 11 and the arc portions 13a ₂ and 13b _{2 of} the first and second valve bodies 13a and 13b. The gap is covered by the surface tension of the remaining water. There are times when it cannot be drained. In order to destroy the surface tension of the residual water, a sufficient gap should be provided between the flow path wall surface of the valve body 11 and the arc portions 13a ₂ and 13b _{2 of} the first and second valve bodies 13a and 13b. Is preferred. Therefore, when the first and second valve bodies 13a and 13b rotate, for example, by 30 °, the surface tension of the residual water in the gap does not occur. Therefore, the remaining water can be drained.

  In addition, even if the bypass circuit 22 side stops when it is fully closed (can body side is fully open), the remaining water in the hot water supply device 20 is mainly on the can body side, so that the remaining water can be drained. In this case, the rotation angle of the valve body on the bypass circuit 22 side is 180 °. Therefore, it is preferable that the valve device 1 is operated so that the valve body on the bypass circuit 22 side is moved to an arbitrary position of, for example, 30 ° or more and 180 ° or less.

  The valve device 1 is preferably operated so that the first and second valve bodies 13a and 13b rotate 90 °. In this case, since the opening areas of the first and second valve bodies 13a and 13b are maximized, the drainage effect of both can be maximized. And if this bypass operation is performed, it will be in a standby state (step S17).

Next, the effect of this Embodiment is demonstrated.
According to the valve device 1 of the present embodiment, as shown in FIGS. 2 and 3, the first and second valve bodies 13a and 13b are the first and second valve bodies centered on the axis C-C. The first and second cutouts 13a ₁ and 13b ₁ can be opened and closed by the rotation of 13a and 13b. For this reason, the opening / closing operation can be performed only by the rotation of the shaft body 12 to which the first and second valve bodies 13a and 13b are connected.

Further, as shown in FIGS. 11 and 12, the first and second valve bodies 13a and 13b are all turned to the first notch 13a ₁ by the rotation of the shaft body 12 about the axis C-C in response to the stop command. After being closed and positioned so that the second notch 13b ₁ is fully opened, the shaft 12 is stopped so that at least the first notch 13a ₁ is opened by the rotation of the shaft body 12 about the axis C-C. Since at least the first notch 13a ₁ is opened, fluid can flow between the first opening 13a and the second opening 13b. Thereby, the residual water inside the valve device 1 can be drained to prevent freezing.

Further, the driving means for rotating the shaft body 12 may be out of step unless the zero point adjustment is periodically performed. Therefore the first and second valve body 13a so that the first notch 13a ₁ after the valve device 1, the stop command of this embodiment notches 13b ₁ of the fully close the second is fully opened, 13b are located. Thereby, the zero point adjustment becomes possible after the stop command. For this reason, step-out can be prevented by adjusting the zero point.

Further, according to the valve device 1 of the present embodiment, the first and second cutouts 13a ₁ and 13b ₁ are opened and closed by the rotation of the shaft body 12 as compared with the configuration in which the shaft provided with the valve body is slid. Since operation is possible, the valve apparatus 1 can be reduced in size.

  By using the valve device 1 of the present embodiment in the hot water supply device 20 shown in FIG. 10, the opening and closing operation can be performed only by the rotation of the shaft body 12 to which the first and second valve bodies 13a and 13b are connected. Moreover, the residual water inside the valve device 1 can be drained to prevent freezing.

  Moreover, according to the hot water supply device 20 of the present embodiment, the heat exchanger 21 is connected to the second opening 11b, and the bypass circuit 22 is connected to the third opening 11c. Residual water on the second opening 11b side on the heat exchanger 21 side where the heat is generated can be drained through the first opening 11a. Thereby, freezing can be prevented.

  Further, since the heat exchanger 21 side is opened after the heat exchanger 21 side is fully closed and the bypass circuit 22 side is fully opened, when a re-bath instruction is issued during the stop operation, the re-bath water is heated to a high temperature. It can be avoided.

  Further, in the hot water supply apparatus 20 of the present embodiment, the incoming water to the apparatus 20 is once distributed to the heat exchanger 21 side and the bypass circuit 22 side, and the high-temperature water that has passed through the heat exchanger 21 and the bypass circuit 22. The desired hot water temperature is obtained by mixing with the low-temperature water that has passed through. At this time, by adjusting the distribution ratio by the valve device 1, it becomes possible to control to a desired tapping temperature.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention can be particularly advantageously applied to a valve device that can be operated in accordance with an input command and a hot water supply device including the valve device.

DESCRIPTION OF SYMBOLS 1 Valve apparatus, 2 Stepping motor, 3 Servo mounting plate, 11 Valve main body, 11A Flow path, 11a 1st opening part, 11b 2nd opening part, 11c 3rd opening part, 11d 4th opening part, 11e Groove, 12 shaft body, 13a first valve body, 13b second valve body, 13a ₁ first notch, 13b ₁ second notch, 13a ₂ , 13b ₂ arc portion, 14 spacer, 14a first shielding Part, 14b second shielding part, 14c connecting part, 14d convex engaging part, 14e through hole, 15 valve collar, 16a, 16b O-ring, 20 hot water supply device, 21 heat exchanger, 22 bypass circuit, 23 combustion burner 24 Blower, 31 Water supply piping, 31a Water supply side portion, 31b Heat exchanger side portion, 32 Hot water piping, 40 Control unit, 41 Switch, 42 Remote controller.

Claims (2)

A valve device operable in accordance with an input command,
A valve body including a flow path having a first opening, and a second opening and a third opening disposed so as to sandwich the first opening;
A shaft body arranged in the flow path of the valve body and configured to be rotatable about an axis; and
A first notch is formed in a disk shape centered on the axis and connected to the shaft so as to be positioned between the first opening and the second opening in the flow path. A first valve body having a different shape;
A second notch is formed in a disk shape that is connected to the shaft body so as to be positioned between the first opening and the third opening in the flow path, and that is centered on the axis. A second valve body having a different shape ;
A first shielding portion disposed alongside the first valve body in a direction in which the axis extends so as to be positioned between the first opening and the second opening in the flow path; ,
A second shielding portion disposed in line with the second valve body in a direction in which the axis extends so as to be positioned between the first opening and the third opening in the flow path; With
The first and second valve bodies are capable of opening and closing the first and second notches by rotation of the first and second valve bodies about the axis.
By the input command, the first cutout is entirely covered by the first shielding portion by the rotation of the shaft body around the axis, and the first cutout is fully closed and the second cutout is performed . After the entire notch is positioned so that the second notch is fully opened without being covered with the second shielding part, at least one of the first notches is caused by rotation of the shaft body around the axis. The valve device is covered with the first shielding portion, and the remaining portion is not covered with the first shielding portion and stops so that the first notch is opened. The valve device according to claim 1,
A heat exchanger connected to the second opening;
A hot water supply device comprising a bypass circuit connected to the third opening.

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