JP5421181B2 - Heat pump water heater - Google Patents

Description

  The present invention relates to a heat pump water heater that heats hot water with a heat pump unit and stores the hot water in a hot water storage tank.

A conventional heat pump type water heater will be described with reference to FIG.
Reference numeral 101 denotes a hot water storage tank for storing hot water, reference numeral 102 denotes a hot water storage tank unit that is housed in the housing including piping and a control unit connected to the hot water storage tank 101, and reference numeral 103 is connected to the lower part of the hot water storage tank 101 to supply city water. A water supply pipe, 104 is a heat pump unit as a heating means for heating hot water in the hot water storage tank 101, 105 is a water supply bypass pipe branched from the water supply pipe 103, 106 is a hot water discharge pipe for discharging hot water from the upper part of the hot water storage tank, and 107 is water supply A hot water supply mixing valve 109 adjusts the low temperature water in the bypass pipe 105 and the high temperature water in the hot water discharge pipe 106 to an appropriate temperature and flows into the hot water supply pipe 108, and 109 indicates the high temperature in the low temperature water in the hot water supply bypass pipe 105 and the high temperature in the hot water discharge pipe 106. A bath mixing valve that adjusts the water to an appropriate temperature and flows into the hot water pipe 110, 111 is a relief valve that communicates with the upper part of the hot water storage tank 101, and 112 is a water supply valve Adjustable hydrant the inflow of water in closing plug installed within the tube 103, 113 is provided with a drain valve installed in the drainage pipe for draining hot water in the hot water storage tank 101.

  In such a heat pump type water heater, when the hot water mixing valve 107 and the bath mixing valve 109 are replaced, when the operator closes the water tap 112 and opens the relief valve 111, the drain valve 113 is opened, as shown in FIG. The hot water in the hot water storage tank 101 is drained until the water level becomes lower than the position where the hot water mixing valve 107 and the bath mixing valve 109 are installed, the drain valve 113 is closed, and then the operator Either or both of the mixing valve 107 and the bath mixing valve 109 are removed and replaced, and after the replacement is completed, the water tap 112 is opened so that the amount of hot water drained into the hot water storage tank 101 is satisfied. It was necessary to supply water.

Japanese Patent No. 4294624

  However, in this conventional apparatus, even when a predetermined amount of hot water in the hot water storage tank 101 is drained, the heat of the high-temperature water that has filled the hot water discharge pipe 106 remains, and the temperatures of the hot water mixing valve 107 and the bath mixing valve 109 remain. Was not sufficiently reduced, and there was a risk of burns when the operator removed and replaced.

  Further, since it is necessary to drain the hot water in the hot water storage tank 101 until the water level becomes lower than the position where the hot water mixing valve 107 and the bath mixing valve 109 are installed, it takes several minutes for the drainage work and the hot water can be used. A large amount of hot water was drained.

In order to solve the above problems, in claim 1 of the present invention, a hot water storage tank for storing hot water, a heat pump unit for heating hot water in the hot water storage tank, a water supply pipe for supplying water to the hot water storage tank, and the water supply pipe A hot water supply by mixing a branched water supply bypass pipe, a water faucet for flowing water into the water supply pipe, a hot water outlet pipe for discharging hot water in the hot water storage tank, hot water in the hot water discharge pipe and water supply in the water supply bypass pipe A hot water mixing valve for supplying to the pipe, a bath mixing valve for mixing the hot water in the hot water pipe and the water in the water supply bypass pipe to supply the hot water pipe, a hot water tap for discharging hot water in the hot water pipe, a drain valve for draining hot water in the hot water tank, feeding into the hot water storage and relief valve releasing the pressure rise in the tank, the disposed downstream side course of the branch point of the water supply pipe and the water supply bypass pipe the hot water storage tank In a heat pump type hot water heater provided with a water supply shut-off means for shutting off and a replacement mode start means for starting a replacement mode for the hot water mixing valve and the bath mixing valve, when the start of the replacement mode by the replacement mode start means is detected. A valve that shuts off water supply to the hot water storage tank by the water supply shut-off means, closes the water supply bypass pipe side of the hot water mixing valve, and connects the hot water pipe side of the bath mixing valve and the water supply bypass pipe side It adjusts to the opening.

Further, in claim 2, a hot water storage tank for storing hot water, a heat pump unit for heating the hot water in the hot water storage tank, a water supply pipe for supplying water to the hot water storage tank, a water supply bypass pipe branched from the water supply pipe, A water faucet that flows water into the water supply pipe, a hot water pipe that discharges hot water in the hot water storage tank, a hot water mixing valve that mixes hot water in the hot water pipe and water supply in the water supply bypass pipe and supplies the mixed water to the hot water pipe The hot water in the hot water pipe and the hot water in the water supply bypass pipe are mixed and supplied to the hot water pipe, a hot water tap for discharging hot water in the hot water pipe, and the hot water in the hot water storage tank are drained. a drain valve, and the hot water storage relief valve releasing the pressure rise in the tank, a water supply shut-off means the installed downstream the middle of the branch point of the water supply pipe and the water supply bypass pipe to block the water supply to the hot water storage tank In a heat pump type hot water heater comprising an exchange mode start means for starting an exchange mode of the hot water mixing valve and the bath mixing valve, when the start of the exchange mode by the exchange mode start means is detected, the hot water storage means is used to blocking the water supply to the tank, the said pouring tube side of the hot water supply mixing valve communicates with said water supply bypass pipe side, is to adjust the valve opening to close the water supply bypass pipe side of the bath mixing valve .

  Moreover, in Claim 3, the said water supply interruption | blocking means is comprised with a manual closing valve.

  According to this invention, the water supply passage from the water supply pipe to the hot water storage tank is shut off by the water supply cutoff means, and the hot water supply valve is opened after adjusting the hot water supply mixing valve and the bath mixing valve to the predetermined valve opening degree. Since the low-temperature water supply can be allowed to flow into the high-temperature tap pipe, there is no risk of burns when the operator replaces each mixing valve.

  Also, when the temperature of the hot water discharged from the hot water tap has dropped, shut it off, and then close the water tap to close the water supply to the water supply pipe. When the water is opened and drained, the water supply passage from the water supply pipe to the hot water storage tank is blocked by the water supply cutoff means, so that only high-temperature water present in the hot water discharge pipe can be drained, minimizing the amount of drainage. It can be suppressed.

Schematic configuration diagram of a heat pump type water heater showing an embodiment of the present invention The figure explaining the water supply flow path at the time of the exchange mode of the embodiment The figure explaining the drainage channel at the time of exchange mode of the embodiment The figure explaining the water supply flow path at the time of the exchange mode of the embodiment The figure explaining the water supply flow path at the time of the exchange mode of the embodiment The figure explaining the water supply flow path at the time of the exchange mode of 2nd Embodiment of this invention Schematic block diagram of a heat pump type water heater showing a third embodiment of the present invention The schematic block diagram which shows one Embodiment of the conventional heat pump type water heater The figure explaining the drainage channel at the time of mixing valve exchange of the embodiment

Next, a first embodiment to which the present invention is applied will be described with reference to FIG.
Reference numeral 1 denotes a hot water storage tank unit in which a hot water storage tank 2 is housed, 3 is a hot water outlet pipe for discharging hot water in the upper part of the hot water storage tank 2, and 4 is a water supply pipe for supplying water to the hot water storage tank 2.

  5 is a heat pump unit as a heating means, a compressor 6 that compresses the refrigerant to high temperature and high pressure, a water refrigerant heat exchanger 7 as a condenser, an expansion valve 8 that decompresses the refrigerant, and exchanges heat with air to exchange the refrigerant. A heat pump circuit 10 composed of a heated air heat exchanger 9, a heat pump forward pipe 11 connecting the lower part of the hot water storage tank 2 and the water refrigerant heat exchanger 7 by piping, and a pipe of the water refrigerant heat exchanger 7 and the upper part of the hot water storage tank 2 Are connected to the heat pump return pipe 12, the heat pump return pipe 11 and the heat pump return circuit 12 are connected to the circulation pump 14 for conveying hot water through the heating circulation circuit 13, and the heat pump control section 15 is configured to control the driving of these pumps.

  16 is a water supply bypass pipe branched from the water supply pipe 4, 17 is a hot water supply mixing valve that mixes hot water in the hot water supply pipe 3 and the hot water supply bypass pipe 16 at a predetermined ratio to adjust to a hot water supply set temperature, and 18 is a hot water supply pipe 3 and water supply. This is a bath mixing valve that mixes hot water in the bypass pipe 16 at a predetermined ratio and adjusts the temperature to the bath set temperature.

  19 is a hot-water tap that allows hot water flowing in the hot-water supply pipe 20 to be discharged by opening the plug from a hot-water supply port 21 in a washroom or the like, and 22 is a hot-water supply temperature for detecting the temperature of the hot water flowing in the hot-water supply pipe 20. A sensor 23 is a hot water supply flow rate counter that detects the flow rate of hot water flowing in the hot water supply pipe 20.

Reference numeral 24 denotes a heat exchanger for bath made of a stainless snake pipe for heating hot water in the bathtub 25, and is provided in the hot water storage tank 2. Reference numeral 26 denotes a bath outlet pipe for transporting hot water in the bathtub 25 to the bath heat exchanger 24, 27 denotes a bath return pipe for transporting hot water heated by the bath heat exchanger 24 into the bathtub 25, and 28 denotes a bath. A bath circulation pump that is installed in the return pipe 27 and sequentially circulates hot water in the bathtub 25, the bath outlet pipe 26, the bath heat exchanger 24, and the bath return pipe 27, and the hot water in the bathtub 25 is stored in the hot water storage tank 2. It is heated by high-temperature water and is kept warm and chased.
Reference numeral 29 denotes a bath temperature sensor that detects the temperature of hot water flowing in the bath return pipe 27.

  Reference numeral 30 denotes a hot water pipe that conveys hot water adjusted to the set temperature by the bath mixing valve 18 to the bath return pipe 27. In the middle of the piping, the hot water temperature that detects the temperature of the hot water mixed by the bath mixing valve 18 is detected. A sensor 31, a hot water filling valve 32 for starting and stopping hot water filling to the bathtub 25, a bath flow rate counter 33 for detecting the amount of hot water filling to the bathtub 25, and a check valve 34 for preventing the hot water in the bathtub 25 from flowing backward. is set up.

  Reference numeral 35 denotes a hot water supply control unit composed of a microcomputer or the like, which controls the heat-pump control unit 15 to raise or increase the hot water storage tank 2 by the heating circulation circuit 13 based on information of the hot water storage temperature thermistors 36 installed on the side surface of the hot water storage tank 2. Controls such as hot water supply temperature, hot water bathing, chasing, and warming.

  Reference numeral 37 denotes a remote controller capable of various settings such as hot water supply and bath. A boiling start switch 38 for boiling hot water in the hot water storage tank 2 to a high temperature, a temperature setting switch 39 for setting hot water temperature, and hot water filling to the bathtub 25 are provided. A hot water filling switch 40 for instructing, a hot water filling amount setting switch 41 for setting the hot water filling amount, a mixing valve exchange switch 42 as an exchange mode starting means for starting an exchange mode when the hot water supply mixing valve 17 and the bath mixing valve 18 are exchanged. In addition, the user can visually check the setting status by the display unit 43 formed of a dot matrix type fluorescent display tube.

  44 is a mixing valve control unit that performs various controls when the mixing valve replacement switch 42 is pressed, a pressure detecting means 45 that determines whether the mixing valve replacement switch 42 has been pressed, the opening direction of various valves installed in the piping, A valve opening direction adjusting means 46 for performing control such as opening / closing adjustment is provided. The mixing valve replacement switch 42 may be provided on the substrate of the mixing valve control unit 44.

  47 is an electric shut-off valve as a water supply shut-off means that is installed in the middle of the water supply pipe 4 and can shut off the water supply flow path to the hot water storage tank 2 by closing the valve, and 48 is a relief valve that communicates with the upper part of the hot water storage tank 2. 49 is a pressure reducing valve provided in the water supply pipe 4, a water tap 50 is provided upstream from the pressure reducing valve 49, and 51 is a drain valve connected to the bottom of the hot water storage tank 2 to drain hot water to the outside. .

Next, the operation at the time of mixing valve replacement in the first embodiment of the present invention will be described.
First, when the pressing detection means 45 detects that the mixing valve replacement switch 42 as the replacement mode starting means installed on the remote controller 37 is pressed, the replacement mode is started and the valve opening direction adjusting means 46 is closed. 47 is operated, the water supply flow path from the water supply pipe 4 to the hot water storage tank 2 is shut off, the water supply bypass pipe 16 side of the hot water supply mixing valve 17 is closed, and the hot water supply pipe 3 side and the water supply bypass pipe 16 side of the bath mixing valve 18 are connected. Is adjusted to a valve opening degree at which 50% is opened.

  After the adjustment of each valve, the operator turns off the breaker of the hot water storage tank unit 1 (not shown) and then opens the hot water tap 19, so that the water supply indicated by the thick line as shown in FIG. A flow path is formed in which the bypass pipe 16, the bath mixing valve 18, the hot water supply pipe 3, the hot water supply mixing valve 17, and the hot water supply pipe 20 are sequentially distributed and discharged from the hot water supply port 21. In addition, the hot water which exists in the tapping pipe 3 is shown with the oblique line.

  After opening the hot water tap 19, when the operator confirms that the temperature of the hot water discharged from the hot water outlet 21 has dropped, the hot water tap 19 is closed, and the water tap 50 is further closed to supply water to the water supply pipe 4. Cut off.

  After closing the hot water tap 19 and the water tap 50, the operator opens the relief valve 48 and then opens the drain valve 51, so that the hot water indicated by the hatched lines in the hot water outlet pipe 3 as shown in FIG. When the water is drained and a draining time of several seconds (2 to 3 seconds) elapses, the drain valve 51 is closed.

  After the drain valve 51 is closed, one or both of the hot water mixing valve 17 and the bath mixing valve 18 in which an abnormality has occurred by the operator is removed, and an exchange operation is performed to install a new mixing valve. Do.

  After the replacement of the hot water mixing valve 17 and the bath mixing valve 18 is completed, the operator opens the water tap 50 again so that the water pipe 4, the water supply bypass pipe 16, and the hot water pipe 3 are sequentially distributed as shown in FIG. A flow path is formed to supply water from the upper part of the hot water storage tank 2.

  After the water tap 50 is opened and water is supplied to the hot water storage tank 2, when the operator confirms that hot water has overflowed from the relief valve 48, the relief valve 48 is closed to stop water supply to the hot water storage tank 2.

  When the operator turns on the breaker after closing the relief valve 48, the exchange mode that has been set is canceled by the initialization operation, and the shutoff valve 47 is opened as shown in FIG. A flow path for supplying water to the lower part is formed, and the hot water supply mixing valve 17 and the bath mixing valve 18 are returned to the initial valve openings, thereby completing the exchange mode.

  With the above operation, when either or both of the hot water mixing valve 17 and the bath mixing valve 18 are replaced, the shutoff valve 47 installed in the middle of the water supply pipe 4 is closed to shut off the water supply to the hot water storage tank 2. By adjusting the hot water mixing valve 17 and the bath mixing valve 18 to a predetermined valve opening, low temperature water flows into the outlet pipe 3 connected to each mixing valve and cools, so that the operator The risk of being burned when the valve is removed is prevented, and the time for draining hot water from the hot water storage tank 2 is several seconds, so the amount of drainage can be minimized.

Next, the operation at the time of replacement of the mixing valve in the second embodiment of the present invention will be described.
In this embodiment, when the pressing detection means 45 detects that the mixing valve replacement switch 42 has been pressed, the replacement mode is started and the water supply passage is shut off by the closing valve 47, and then the hot water outlet pipe 3 of the hot water mixing valve 17. As shown in FIG. 6, the valve opening degree is adjusted to 50% for each side and the water supply bypass pipe 16 side, and the hot water supply valve 32 is opened after the water supply bypass pipe 16 side of the bath mixing valve 18 is closed. In this way, a flow path is formed in which the water supply in the water supply pipe 4 flows through the water supply bypass pipe 16, the hot water discharge pipe 3, and the hot water filling pipe 30 in order and flows into the bathtub 25.

  When the operator determines that the temperature of the hot water flowing into the bathtub 25 has decreased, the mixing valve replacement switch 42 is pressed again to close the hot water filling valve 32, and after the breaker is turned off, the water tap 50 is closed. Then, after draining the drain valve 51 for several seconds to drain hot water, either one or both of the hot water mixing valve 17 and the bath mixing valve 18 are replaced.

  By the above operation, it is possible to prevent the operator from being burned when replacing one or both of the hot water mixing valve 17 and the bath mixing valve 18, and to perform a safe replacement operation. The amount of hot water drained from can be minimized.

Next, a third embodiment to which the present invention is applied will be described with reference to FIG.
In this embodiment, the shut-off valve 47 is manually operated, and the operator shuts off the shut-off valve 47 to shut off the water supply from the water supply pipe 4 to the hot water storage tank 2. For this reason, it is necessary for the operator to close the closing valve 47 before pressing the mixing valve replacement switch 42 to enter the replacement mode when replacing each mixing valve.

  Further, after the mixing valve replacement operation is completed, the water tap 50 is opened to supply water to the hot water storage tank 2, and when it is confirmed that hot water has overflowed from the relief valve 48, the relief valve 48 is closed. Before operating the breaker and turning it ON, the operator opens the shutoff valve 47 so that a flow path from the water supply pipe 4 to the lower part of the hot water storage tank 2 is formed.

  By the above operation, it is possible to prevent the operator from being burned when replacing one or both of the hot water mixing valve 17 and the bath mixing valve 18, and to perform a safe replacement operation. The amount of hot water drained from can be minimized.

  In the replacement mode, either the hot water supply mixing pipe 17 or the bath mixing valve 18 is opened by 50% each on the side of the hot water supply pipe 3 and the side of the hot water supply bypass pipe 16, but the side of the hot water supply bypass pipe 16 and the side of the hot water supply pipe 3 communicate with each other. However, the valve opening degree may be changed as long as the water supply can flow from the water supply bypass pipe 16 to the hot water discharge pipe 3.

  In addition, when water is supplied to the tap pipe 3 and cooled in the exchange mode, if hot water does not come out even when the operator opens the hot water tap 19, the hot water mixing valve 17 opens the side of the tap pipe 3 fully. However, since the bath mixing valve 18 is considered to be fully open on the side of the hot water discharge pipe 3 or the water supply bypass pipe 16, it can be determined that at least the bath mixing valve 18 is abnormal, and the hot water tap 19 is turned on in the exchange mode. If the hot water is not discharged and only the low temperature water is continuously discharged when the plug is opened, it is considered that the hot water supply mixing valve 17 fully opens the water supply bypass pipe 16 regardless of the valve opening degree of the bath mixing valve 18. It can be determined that at least the hot water mixing valve 17 is abnormal.

  As described above, at the time of exchanging one or both of the hot water mixing valve 17 and the bath mixing valve 18, the shutoff valve 47 installed in the middle of the water supply pipe 4 is closed to shut off the water supply to the hot water storage tank 2, By adjusting the hot water supply mixing valve 17 and the bath mixing valve 18 to a predetermined valve opening degree, the cold water supply flows into the outlet pipe 3 connected to each mixing valve and is cooled, so that the operator can mix. The risk of burns when replacing the valve can be prevented, and the amount of hot water drained from the hot water storage tank 2 can be minimized.

DESCRIPTION OF SYMBOLS 2 Hot water storage tank 3 Hot water pipe 4 Water supply pipe 5 Heat pump unit 17 Hot water supply mixing valve 18 Bath mixing valve 19 Hot water tap 20 Hot water supply pipe 30 Hot water filling pipe 47 Shut-off valve 48 Relief valve 50 Water supply tap 51 Drain valve

Claims (3)

A hot water storage tank that stores hot water, a heat pump unit that heats the hot water in the hot water storage tank, a water supply pipe that supplies water to the hot water storage tank, a water supply bypass pipe that branches from the water supply pipe, and water that flows into the water supply pipe A water tap, a hot water pipe for discharging hot water in the hot water storage tank, a hot water mixing valve for mixing hot water in the hot water pipe and water in the water supply bypass pipe to supply the hot water pipe, hot water in the hot water pipe, A bath mixing valve that mixes the water supply in the water supply bypass pipe and supplies the hot water pipe to the hot water supply pipe, a hot water tap that discharges the hot water in the hot water supply pipe, a drain valve that drains the hot water in the hot water storage tank, and the hot water storage tank a relief valve releasing the pressure increase of the inner, and water supply interrupting means for interrupting the water supply to the hot water storage tank disposed downstream the middle of the branch point of the water supply bypass pipe and the water supply pipe, the hot water supply mixing valve and In a heat pump type hot water heater provided with an exchange mode start means for starting the exchange mode of the bath mixing valve, when the start of the exchange mode by the exchange mode start means is detected, water supply to the hot water storage tank is performed by the water supply shut-off means. Heat pump hot water supply characterized in that it is shut off, the water supply bypass pipe side of the hot water supply mixing valve is closed, and the valve opening degree that connects the hot water supply pipe side and the water supply bypass pipe side of the bath mixing valve is adjusted. Machine. A hot water storage tank that stores hot water, a heat pump unit that heats the hot water in the hot water storage tank, a water supply pipe that supplies water to the hot water storage tank, a water supply bypass pipe that branches from the water supply pipe, and water that flows into the water supply pipe A water tap, a hot water pipe for discharging hot water in the hot water storage tank, a hot water mixing valve for mixing hot water in the hot water pipe and water in the water supply bypass pipe to supply the hot water pipe, hot water in the hot water pipe, A bath mixing valve that mixes the water supply in the water supply bypass pipe and supplies the hot water pipe to the hot water supply pipe, a hot water tap that discharges the hot water in the hot water supply pipe, a drain valve that drains the hot water in the hot water storage tank, and the hot water storage tank a relief valve releasing the pressure increase of the inner, and water supply interrupting means for interrupting the water supply to the hot water storage tank disposed downstream the middle of the branch point of the water supply bypass pipe and the water supply pipe, the hot water supply mixing valve and In a heat pump type hot water heater provided with an exchange mode start means for starting the exchange mode of the bath mixing valve, when the start of the exchange mode by the exchange mode start means is detected, water supply to the hot water storage tank is performed by the water supply shut-off means. blocked, the said pouring tube side of the hot water supply mixing valve communicates with said water supply bypass pipe side, heat pump water heater, characterized in that to adjust the valve opening to close the water supply bypass pipe side of the bath mixing valve Machine.   The heat pump type hot water heater according to claim 1 or 2, wherein the water supply shut-off means is constituted by a manual shut-off valve.

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