JP2010281540A - Hot water storage type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water storage type water heater which prevents hot water of high temperature from being supplied to a hot water supply terminal even when the air accumulates in an upper section of a hot water storage tank. <P>SOLUTION: This hot water storage type water heater includes the hot water storage tank 3 for storing the water of high temperature, a remaining hot water temperature detecting means 46a detecting a temperature of hot water/water in the hot water storage tank 3, a hot water supply pipe 32 for taking the hot water/water from the hot water storage tank 3, a water supply pipe 31 for supplying the water to the hot water storage tank 3, a terminal water supply pipe 33 branched from the water supply pipe 31, and a mixing means 4 connecting the hot water supply pipe 32 and the terminal water supply pipe 33 and mixing the hot water/water, and a hot water-side opening of the mixing means 4 is controlled on the basis of the temperature detected by the remaining hot water temperature detecting means 46a. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a hot water storage type water heater, and more particularly to control of a mixing valve.

  FIG. 10 is a schematic view of a conventional hot water storage type water heater. As shown in FIG. 10, the conventional hot water storage type hot water heater has a hot water storage tank 100 for storing high-temperature hot water, and a hot water storage pipe 100 for supplying water from a water supply source is connected to the lower part of the hot water storage tank 100. A hot water discharge pipe 103 for discharging hot water to the hot water supply terminal 102 is connected to the upper part of the hot water supply terminal 102. High temperature hot water is stored inside the hot water storage tank 100, and a heat pump unit as an external heat source, an electric heater or the like is provided inside the hot water storage tank, and high temperature soot is generated (see, for example, Patent Document 1).

  Further, the terminal water supply pipe 104 extends from the water supply pipe 101 and is connected to the mixing valve 105. The hot water outlet pipe 103 is also connected to the mixing valve 105, and is mixed to a desired temperature by the mixing valve 105. Further, a temperature sensor 106 is disposed on the downstream side of the mixing valve 105, and the opening degree of the mixing valve 105 is set so that a value detected by the temperature sensor 106 becomes a hot water supply temperature set by a remote control device (not shown). Is feedback controlled.

  In addition, a relief valve 107 for adjusting the pressure inside the hot water storage tank is connected to the hot water discharge pipe 103, so that the internal pressure of the hot water storage tank 100 is maintained at a set pressure during the heating operation inside the hot water storage tank 100, or the expansion water is discharged. To do.

  In addition, a drain pipe 108 is connected to the lower part of the hot water storage tank 100 so that hot water in the hot water storage tank 100 can be drained to the outside. In order to discharge the scale component accumulated at the bottom of the hot water storage tank 100 to the outside, maintenance may be performed such that hot water is removed from the bottom of the hot water storage tank 100 through the drain pipe 108.

JP 2005-265369 A

  However, after draining the hot water in the hot water storage tank 100 from the drain pipe 108, when the low temperature water is poured into the hot water storage tank 100 again through the water supply pipe 101, the relief valve 107 is operated to connect the hot water storage tank 100 to the atmosphere. Otherwise, the air inside the hot water storage tank 100 is pushed out, and hot water is not poured into the hot water storage tank 100 until it is full. As a result, an air layer is formed on the upper part of the hot water storage tank 100. Further, not only during maintenance, but also when an unfrozen water faucet in a cold region or the like is operated, an air layer is sometimes formed on the hot water storage tank 100.

  If an air layer is formed in the upper part of the hot water storage tank 100 in this way, when hot water is discharged from the hot water supply terminal 102 next time, only air is supplied to the hot water side of the mixing valve 105. FIG. 11 is a control flow diagram of a conventional mixing valve. Here, the conventional mixing valve control will be described with reference to FIG.

In the normal control of the mixing valve, the opening degree of the mixing valve is adjusted based on the temperature detected by the temperature sensor provided on the downstream side of the mixing valve. That is, the opening degree of the mixing valve is feedback-controlled so that the temperature detected by the temperature sensor becomes the temperature set by the remote controller or the like, and the opening degree of the mixing valve is adjusted so that the hot water becomes the set temperature. .

  Here, at time T1, when the user starts hot water from a hot water supply terminal or a shower terminal while air remains in the upper part of the hot water storage tank, low temperature water is supplied from the water supply source to the water side of the mixing valve. However, only the air above the hot water storage tank is supplied to the hot water side. Since the mixing valve is feedback controlled based on the temperature detected by the temperature sensor, the temperature detected by the temperature sensor does not rise, and gradually increases the opening on the hot water side so as to increase the temperature detected by the temperature sensor. And finally the hot water side is fully opened at time T2.

  At this time, during a period from time T1 to time T2, low temperature water supplied from the water side of the mixing valve is discharged, so a certain amount of flow is detected for a moment, but gradually opens to the hot water side, The amount of low-temperature water supplied from the water side decreases, and almost no longer flows after the time T2 when the hot water side is fully opened (there may be some leakage and flow).

  When the hot water is kept open with the hot water side fully open, the air accumulated in the upper part of the hot water storage tank gradually escapes through the hot water supply terminal, and all the air is discharged at time T3. Then, hot water starts to be supplied to the hot water side of the mixing valve, but since the opening degree of the mixing valve is fully open, the hot water discharged from the hot water storage tank is supplied to the hot water supply terminal as it is. It will be.

  When the supply of hot water to the hot water side is started, the control of the mixing valve is feedback control. Therefore, the opening of the mixing valve is adjusted based on the temperature detected by the temperature sensor, and the set temperature is reached at time T4. The hot water at the set temperature is supplied to the hot water supply terminal. That is, during the period from time T3 to time T4, there was a problem that high-temperature hot water unexpected by the user was discharged from the hot water supply terminal.

  The present invention solves the above-described conventional problems, and a hot water storage type water heater that can prevent hot hot water from being supplied to a hot water supply terminal even when air accumulates in the upper part of the hot water storage tank during operation of non-freezing faucet or maintenance. The purpose is to provide.

  In order to solve the above-mentioned conventional problems, a hot water storage type water heater of the present invention takes out hot water from a hot water storage tank for storing high temperature water, a remaining hot water temperature detecting means for detecting the temperature of the hot water in the hot water storage tank, and hot water from the hot water storage tank. A hot water supply pipe, a water supply pipe for supplying water to the hot water storage tank, a terminal water supply pipe branched from the water supply pipe, and a mixing means for connecting the hot water supply pipe and the terminal water supply pipe to mix hot water are detected by the remaining hot water temperature detection means. Even if there is an air layer at the top of the hot water storage tank by regulating the hot water side opening of the mixing means based on the temperature that is generated, the air layer from the top of the hot water storage tank will accompany the hot water from the hot water supply terminal Even when the hot water is completely removed, the flow of high temperature hot water to the hot water side of the mixing means is restricted, so that unexpected hot water discharge from the hot water supply terminal can be prevented.

  INDUSTRIAL APPLICABILITY The present invention can provide a hot water storage type hot water heater that can prevent high temperature hot water from being supplied to a hot water supply terminal even when air accumulates in the upper part of the hot water storage tank during non-freezing faucet operation or maintenance.

The block diagram of the hot water storage type hot water heater in Embodiment 1 of this invention Mixing valve control flowchart in the first embodiment The table of regulation opening degree corresponding to the remaining hot water temperature of the hot water storage tank in the first embodiment Mixing valve control flow chart in Embodiment 2 of the present invention Mixing valve control flow chart in Embodiment 3 of the present invention Mixing valve control flow chart in Embodiment 4 of the present invention Mixing valve control flowchart in Embodiment 5 of the present invention Mixing valve control flowchart in the fifth embodiment Mixing valve control flowchart in the sixth embodiment of the present invention Schematic diagram of a conventional hot water storage type water heater Conventional mixing valve control flow chart

  A hot water storage type water heater according to a first aspect of the present invention is a hot water storage tank for storing high temperature water, a remaining hot water temperature detecting means for detecting the temperature of the hot water in the hot water storage tank, a hot water pipe for extracting hot water from the hot water storage tank, and water supply to the hot water storage tank. A water supply pipe, a terminal water supply pipe branched from the water supply pipe, a mixing means for connecting the hot water pipe and the terminal water supply pipe to mix hot water, and mixing based on the temperature detected by the remaining hot water temperature detection means Even if there is an air layer at the top of the hot water storage tank by regulating the hot water side opening of the means, mixing even when the air layer is completely removed from the top of the hot water storage tank due to the hot water from the hot water supply terminal Since the inflow of high temperature hot water to the hot water side of the means is restricted, unexpected hot water discharge from the hot water supply terminal can be prevented.

  The hot water storage type water heater of the second invention is provided with a flow rate sensor for detecting the amount of hot water supplied to the hot water supply terminal in the first aspect of the invention. When the flow rate of the hot water is detected by the flow rate sensor for a period of time, the inflow of hot water to the mixing means is surely limited for the first predetermined time by canceling the restriction of the hot water side opening. Therefore, it is possible to reliably prevent hot water from coming out of the hot water supply terminal.

  The hot water storage type hot water heater of the third invention is provided with a flow rate sensor for detecting the amount of hot water supplied to the hot water supply terminal in the first or second invention. By canceling the restriction on the hot water side opening after a lapse of time, even when intermittent hot water is discharged without continuous hot water, hot water from the hot water supply terminal is prevented from being discharged, and user convenience is not impaired.

  The hot water storage type water heater of the fourth aspect of the invention is that in the first to third aspects of the invention, the hot water side opening degree of the mixing means is restricted only when the state where no hot water is discharged to the hot water supply terminal continues for the third predetermined time. Therefore, when there is no possibility that air has accumulated in the upper part of the hot water storage tank, the restriction on the mixing means is released, so that the user's desired temperature can be immediately provided and the usability can be improved. it can.

  The hot water storage type water heater of the fifth invention is provided with a bath flow rate sensor for detecting the flow rate to the bathtub while being configured to enable hot water filling from the hot water storage tank to the bathtub in the first to fourth inventions. When the flow rate is detected by the bath flow sensor during the hot water supply to the hot water supply terminal, the restriction of the hot water side opening of the mixing means is released, so that the air in the hot water storage tank is simultaneously supplied to both the hot water supply terminal and the bathtub. Since it can be discharged, the time until the air in the hot water storage tank is discharged is shortened, and the flow rate to the mixing means is reduced, so the useability is impaired by releasing the restriction on the mixing means There is no.

  The hot water storage type water heater of the sixth aspect of the invention is particularly configured in the fourth aspect of the invention so that hot water can be filled from the hot water storage tank to the bathtub, and has a bath flow rate sensor for detecting the flow rate to the bathtub. When the flow rate is detected by the bath flow rate sensor from the time when the hot water is discharged from the hot water supply terminal to the third predetermined time, the hot water filling is performed by regulating the hot water side opening of the mixing means without restricting the hot water side opening. When air is accumulated inside the tank, air is discharged to the outside through the bathtub, so that it is not necessary to restrict the mixing means more than necessary, and the user's convenience is not impaired.

  The hot water storage type hot water supply apparatus of the seventh invention is provided with temperature setting means for setting the hot water temperature to the hot water supply terminal, particularly in the first to sixth inventions, and the hot water temperature set by the temperature setting means is equal to or higher than a predetermined hot water temperature. Sometimes, by releasing the restriction on the hot water side opening of the mixing means, when the user wants a high temperature, the temperature desired by the user can be provided immediately by releasing the restriction on the high temperature side. And improve usability.

  The hot water storage type hot water supply apparatus according to the eighth aspect of the invention is the seventh aspect of the invention, in particular, even if the tapping temperature set by the temperature setting means is equal to or higher than the predetermined hot water supply temperature, the temperature detected by the remaining hot water temperature detection means is the predetermined residual hot water. If it is more than temperature, the hot water temperature supplied to a hot water supply terminal can be reliably suppressed by restricting the hot water side opening of a mixing means.

  The hot water storage type water heater of the ninth invention is provided with a flow rate sensor for detecting the amount of hot water supplied to the hot water supply terminal in the first to eighth inventions, and when the flow rate detected by the flow rate sensor detects a predetermined flow rate or more, By releasing the restriction on the hot water side opening of the mixing means, it is possible to more accurately detect the timing at which air has escaped from the upper part of the hot water storage tank.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a configuration diagram of a hot-water storage type water heater with a bath reheating function according to the present embodiment. In FIG. 1, the hot water storage type hot water heater of the present embodiment includes a tank unit 1 and a heat pump unit 2, and heat pump unit 2 stores high temperature water stored in a hot water storage tank 3 disposed in the tank unit 1. It is generated by. In the present embodiment, a heat pump is used as the heating means. However, the present invention is not limited to this. For example, there is no problem even if an electric heater is provided in the tank and heated. Moreover, the solid line arrow has shown the direction through which the fluid flows.

  Next, the configuration of the heat pump unit 2 will be described. The heat pump unit 2 is configured by sequentially connecting a water-refrigerant heat exchanger 24, a compressor 25, an evaporator 26, and an expansion valve 27 in an annular manner through a refrigerant pipe, and uses carbon dioxide as a refrigerant. Since the high pressure side exceeds the critical pressure, the water flowing through the water / refrigerant heat exchanger 24 is deprived of heat and does not condense even if the temperature is lowered. A difference is easily formed, high-temperature hot water can be obtained, and heat exchange efficiency can be increased.

  In addition, since carbon dioxide, which is relatively inexpensive and stable, is used as the refrigerant, the product cost can be reduced and the reliability can be improved. In addition, carbon dioxide has an ozone depletion coefficient of zero and a global warming coefficient of about 1/700 of the alternative refrigerant HFC-407C, which is very small.

  Further, in the heat pump unit 2, the refrigerant is compressed by the compressor 25, the refrigerant discharged from the compressor 25 radiates heat by the water refrigerant heat exchanger 24, is decompressed by the expansion valve 27, and then is discharged from the air by the evaporator 26. The heat is absorbed and sucked into the compressor 25 again in a gas state. In the compressor capacity control and the expansion valve 27 opening control, the temperature of the discharged refrigerant detected by a temperature sensor (not shown) provided on the discharge side of the compressor 25 is maintained at a preset temperature. To be controlled.

  Moreover, the hot water in the hot water storage tank 3 flows into the water-refrigerant heat exchanger 24 when the water pump 28 is operated, and exchanges heat with the refrigerant. A three-way valve 43 is provided between the outlet of the water-refrigerant heat exchanger 24 and the hot water storage tank 3 so that the hot water discharged from the water-refrigerant heat exchanger 24 is returned to the upper part or the lower part of the hot water storage tank 3. Has been switched.

  As a result, when the temperature of the hot water coming out of the water-refrigerant heat exchanger 24 is equal to or higher than a predetermined temperature, the three-way valve 43 is switched so as to return to the upper side of the hot water storage tank 3 and the hot water storage tank 3 Returning to the top, hot water is stored in the upper part of the hot water storage tank 3 in a stacked state. When the temperature of the hot water coming out of the water-refrigerant heat exchanger 24 is lower than a predetermined temperature, the three-way valve 43 is switched so as to return to the lower side of the hot water storage tank 3, and the lower part of the hot water storage tank 3 is passed through the lower heating pipe 45. Return to.

  Next, the configuration of the tank unit 1 will be described. As described above, the tank unit 1 has the hot water storage tank 3, and a water supply pipe 31 for supplying low temperature water from a water supply source is connected to the bottom of the hot water storage tank 3, so that the water supply pressure is constantly in the tank. It is in a hanging state. In addition, a hot water discharge pipe 32 for discharging hot water in the hot water storage tank 3 is connected to an upper portion of the hot water storage tank 3 so that high temperature water can be supplied to a hot water supply terminal and a bathtub.

  Further, temperature sensors 46a to 46e, which are a plurality of remaining hot water temperature detecting means for detecting how much hot water remains, are provided above and below the hot water storage tank 3 to detect the temperature of the hot water in the hot water storage tank 3. Yes. In the present embodiment, the remaining hot water temperature detecting means is provided in the upper and lower five, but the number of remaining hot water temperature detecting means is not limited to this, and there may be no problem even if there are four or three, for example. .

  Next, a hot water supply circuit for supplying hot water to the hot water supply terminal will be described.

  The hot water supply circuit in the present embodiment is configured such that the terminal water supply pipe 33 branched from the water supply pipe 31 and the hot water discharge pipe 32 are connected by the electric mixing valve 4 serving as a mixing means, and hot water having a desired temperature can be generated. Has been. The mixing ratio of the electric mixing valve 4 is changed so that the temperature detected by the temperature sensor 41 provided on the downstream side of the electric mixing valve 4 becomes the temperature set by the remote control device provided in the kitchen or bathroom. Is done. Then, the hot water mixed at a desired temperature is supplied to the hot water supply terminal 42. Further, a flow rate sensor 72 for detecting the amount of hot water supplied to the hot water supply terminal is provided, and the amount of hot water supplied to the hot water supply terminal can be detected.

  Next, a hot water filling circuit and a reheating circuit for the bathtub 5 will be described.

  In the present embodiment, the hot water in the bathtub 5 and the high-temperature water in the hot water storage tank 3 exchange heat with the heat exchanger 6 and have a reheating function for reheating the hot water in the bathtub. . Therefore, the high-temperature water in the hot water storage tank 3 is supplied to the high-temperature circuit (reheating primary circuit) of the reheating heat exchanger 6 via the reheating hot water supply pipe 47 branched from the hot water discharge pipe 3. The hot water after the heat exchange is configured to return to the lower part of the hot water storage tank 3 through the reheating hot water pipe 48. At this time, the reheating hot water pipe 48 is connected to the lower boiling piping 45 through the check valve 49 and is returned to the lower part of the hot water storage tank 3.

  Further, the low temperature side circuit (reheating secondary circuit) of the reheating heat exchanger 6 is configured such that hot water in the bathtub 5 is supplied by driving the bath pump 65, and after heat exchange is performed. The bathtub water is returned to the bathtub 5 again.

  In the high temperature side circuit (reheating primary circuit), a temperature sensor 71 serving as high temperature side outlet temperature detecting means is disposed downstream of the reheating pump 7 and the reheating heat exchanger 6, and the reheating pump is provided. By driving 7, the high-temperature water in the hot water storage tank 3 is conveyed to the reheating heat exchanger 6.

And the adapter 51 of the bathtub 5 and the tank unit 1 are connected by the return connection pipe 61 and the forward connection pipe 62 in the connection parts 60a-60d. The return connection pipe 61 and the forward connection pipe 62 are connected to the reheating heat exchanger 6 by a return pipe 63 and a forward pipe 64, respectively. The bathtub 5, the return connection pipe 61, the return pipe 63, The reheating heat exchanger 6, the outgoing pipe 64, and the outgoing connecting pipe 62 are sequentially connected to constitute a reheating circuit.

  The hot water filling circuit for supplying hot water from the hot water storage tank 3 to the bathtub 5 includes a bath hot water supply pipe 34 branched from the hot water supply pipe 32 and a bath water supply pipe 35 branched from the water supply pipe 31 to the electric mixing valve 8. And hot water having a desired temperature can be generated. The mixing ratio of the electric mixing valve 8 is changed so that the temperature detected by the temperature sensor 81 provided on the downstream side of the electric mixing valve 8 becomes the temperature set by the remote control device provided in the kitchen or bathroom. Is done. Then, the hot water mixed at a desired temperature is supplied to the bathtub 5.

  Moreover, the flow rate sensor 82 is provided in the hot water filling circuit, and the amount of hot water supplied to the bathtub 5 is measured. Further, a two-way electromagnetic valve 83 is provided, and at the start of hot water filling, the supply of hot water to the bathtub 5 is started simultaneously with opening of the electromagnetic valve 83. After the electromagnetic valve 83 is opened, hot water filling is performed from two directions of the return pipe 63 and the forward pipe 64 to the bathtub 5. In addition, a check means 84 is provided for preventing the backflow of sewage.

  The return pipe 63 includes a bath pump 65 that is a conveying means for circulating hot water in the bathtub 5, a water level sensor 66 that detects the water level in the bathtub 5, and a bath temperature that detects the temperature of hot water in the bathtub 5. A temperature sensor 67 as a detection means is provided, and when the bath pump 65 is driven, hot water in the bathtub 5 is sucked into the return pipe 63 and flows into the forward pipe 64 via the reheating heat exchanger 6. It is returned to the bathtub 5 again.

  In addition, a flow switch 68 is provided between the bath pump 65 and the reheating heat exchanger 6 as hot water detection means for detecting whether hot water is present in the bathtub 5. Can be detected. That is, it is determined that there is hot water in the bathtub 5 when the flow switch 68 is turned on, and it is determined that there is no hot water in the bathtub 5 when the flow switch 68 is turned off.

  In addition, a remote control device 9 is installed in the bathroom, which is an operation means that can operate the hot water storage type hot water heater, and is a temperature setting means for setting the temperature of hot water in the bathtub 5, and the remote control device 9 is operated. Then, set the temperature of the hot water, fill the bath, and perform the trial run after installation. The remote control device 9 has a display unit 91 for displaying information and an operation unit 92 for performing operations. Further, a remote control device 95 is also provided in the kitchen, and the hot water supply temperature and the amount of hot water can be set in the same manner as the remote control device 9.

  In FIG. 1, the hot water storage type water heater of the present embodiment also includes a control device 94 that receives instructions from the remote control device 9 for the bathtub and the remote control device 95 for the kitchen and commands each control device. . The control device 94 is composed of a microcomputer and its electronic control parts, and sends commands to the devices (such as the bath pump 65 and the reheating pump 7) that constitute the tank unit 1.

  Furthermore, the remote control device 9 of the present invention is provided with a human body detection means 93 so that it can detect that a person has entered the bathroom. The human body detecting means 93 can be various sensors such as an infrared sensor, an illuminance sensor that detects the illuminance in the bathroom, and an impact (vibration) sensor that detects the vibration of the occupant and the opening and closing of the door. Is not specified.

Furthermore, a temperature sensor 69 that is a reheating hot water temperature detecting means for detecting the temperature of the bath water heated by the reheating heat exchanger 6 is provided. This temperature sensor 69 detects the temperature of the hot water sent to the bathtub 5, and the reheating pump 7 is controlled so that the temperature detected by the temperature sensor 69 does not exceed the upper limit temperature. This is because the temperature sensor 69 can detect the temperature of the hot water supplied directly to the bathtub 5, so that hot water having a temperature higher than the upper limit temperature is not supplied to the bathtub 5 to prevent the bather from being burned. can do.

  Next, drive control of the mixing valve will be described. FIG. 2 is a mixing valve control flowchart in the first embodiment. In the present embodiment, the inside of the hot water storage tank 3 is normally full, but the case where hot water is supplied from the state where air has accumulated in the upper part of the hot water storage tank 3 after the operation of the non-freezing faucet or after maintenance is taken as an example. I will explain to you.

  Normally, as in the conventional method, the opening control of the electric mixing valve 4 is simply feedback controlled based on the temperature detected by the temperature sensor 41 provided downstream of the electric mixing valve 4. Air is accumulated in the upper part, and high-temperature water is not supplied to the hot water side of the electric mixing valve 4, and the temperature of the temperature sensor 41 does not rise until the air is completely removed. Gradually opened to the hot water side, and there was a possibility that the hot water in the hot water storage tank 3 would be supplied to the hot water supply terminal 42 at a moment when the air was completely removed.

  Therefore, in the present embodiment, a restriction opening (upper limit opening) is provided for the opening of the electric mixing valve 4 and the opening of the electric mixing valve 4 is not hot for a predetermined time after hot water supply starts. It opens to the side only up to the regulation opening.

  FIG. 3 is a table of the regulation opening degree corresponding to the remaining hot water temperature of the hot water storage tank. As shown in FIG. 3, the higher the temperature detected by the uppermost temperature sensor 46a, the larger the restriction opening degree of the electric mixing valve 4. In the first embodiment, the case where the temperature detected by the temperature sensor 46a provided at the uppermost stage of the remaining hot water temperature detecting means is less than 60 ° C will be described.

  Next, a description will be given with reference to FIGS. First, when the user starts hot water discharge from the hot water supply terminal 42 at time Tx1, the flow sensor 72 detects the flow of hot water. At this time, if the temperature detected by the temperature sensor 46a for detecting the temperature of the hot water storage tank is 58 ° C., it falls into the category of less than 60 ° C. based on the table of FIG. Set to 90%.

  Normally, when the hot water supply from the hot water supply terminal 42 is stopped, the opening degree of the electric mixing valve 4 is set to the intermediate position, so that the opening degree of the electric mixing valve 4 is kept open at the time Tx1. However, since the control of the electric mixing valve 4 is feedback controlled based on the temperature detected by the temperature sensor 41 installed on the downstream side, based on the temperature detected by the temperature sensor 41. The opening degree of the electric mixing valve 4 is controlled. In the present embodiment, the opening of the electric mixing valve 4 while hot water supply is stopped is set to the intermediate position, but the present invention is not limited to this, and there is a problem even if the water side is fully opened or other predetermined position. There is no.

  Then, the opening degree of the electric mixing valve 4 is controlled so that the temperature detected by the temperature sensor 41 becomes the hot water supply temperature set by the remote control device 95. However, when air is accumulated in the hot water storage tank 3, only air is supplied to the hot water side of the electric mixing valve 4, and the temperature detected by the temperature sensor 41 does not rise. The opening of the electric mixing valve 4 gradually opens toward the hot water side, even if a large amount is taken in.

The opening of the electric mixing valve 4 gradually opens toward the hot water side from the time Tx1, but since the restriction opening is set to 90%, it opens only to the position of 90% on the hot water side. Therefore, from time Tx1 to time Tx2, hot water is discharged from the hot water supply terminal 42 by the amount of low temperature water supplied to the water side of the electric mixing valve 4, but the opening is gradually opened to the hot water side at time Tx2. Since it becomes 90% on the hot water side, after time Tx2, water and air are mixed and discharged from the hot water supply terminal 42, and the flow rate is rapidly reduced.

  Then, at the time Tx3 when the air in the upper part of the hot water storage tank 3 is exhausted, hot water is supplied to the hot water side of the electric mixing valve 4 at a stretch, and low temperature water and hot water are mixed and supplied to the hot water supply terminal 42. As a result, the flow rate increases at once. As a result, after the time Tx3, the opening degree of the electric mixing valve 4 is controlled so that the temperature detected by the temperature sensor 41 becomes the set temperature, and is set to the set temperature opening degree.

  Thus, even if the supply of high-temperature water is restored at time Tx3 and high-temperature water is supplied from the hot water storage tank 3 to the electric mixing valve 4, the regulated opening is provided for the hot water side opening. Since mixed hot water is supplied to the hot water supply terminal 42 after being mixed with water to some extent by the valve 4, high-temperature water is not supplied as it is.

(Embodiment 2)
Since the configuration diagram of the hot water storage type hot water heater in the second embodiment is the same as the configuration diagram of the hot water storage type water heater in the first embodiment, the same reference numerals as those in the first embodiment will be used.

  FIG. 4 is a control flow diagram of the electric mixing valve in the second embodiment. In the second embodiment, the case where the temperature detected by the temperature sensor 46a provided at the uppermost stage of the remaining hot water temperature detecting means is 80 ° C. or higher will be described. As in the first embodiment, a case where hot water is supplied from a state where air has accumulated in the upper part of hot water storage tank 3 will be described as an example.

  First, when the user starts discharging hot water from the hot water supply terminal 42 at time Ty1, the flow sensor 72 detects the flow of hot water. At this time, if the temperature detected by the temperature sensor 46a is 85 ° C., it falls into the category of 80 ° C. or higher based on the table of FIG. 3, so the regulated opening degree of the electric mixing valve 4 is set to 50%.

  Normally, when the hot water supply from the hot water supply terminal 42 is stopped, the opening of the electric mixing valve 4 is set to the intermediate position, so that the opening of the electric mixing valve 4 is opened at the standby time at time Ty1. However, since the control of the electric mixing valve 4 is feedback controlled based on the temperature detected by the temperature sensor 41 installed on the downstream side, based on the temperature detected by the temperature sensor 41. The opening degree of the electric mixing valve 4 is controlled. In the present embodiment, the opening of the electric mixing valve 4 while hot water supply is stopped is set to the intermediate position, but the present invention is not limited to this, and there is a problem even if the water side is fully opened or other predetermined position. There is no.

  Then, the opening degree of the electric mixing valve 4 is controlled so that the temperature detected by the temperature sensor 41 becomes the hot water supply temperature set by the remote control device 95. However, when air is accumulated in the hot water storage tank 3, only air is supplied to the hot water side of the electric mixing valve 4, and the temperature detected by the temperature sensor 41 does not rise. The opening of the electric mixing valve 4 gradually opens toward the hot water side, even if a large amount is taken in.

  And if it is conventional control, the opening degree of the electric mixing valve 4 gradually opens from the time Ty1 to the hot water side, but since the restriction opening is set to 50%, the hot water side 50% Open only to the position. That is, since the intermediate opening is 50% when hot water supply is stopped, the electric mixing valve 4 mixes air and low-temperature water without moving from the intermediate opening even when hot water supply is started. 42 is supplied with low temperature water mixed with air. Then, when all of the air is removed at time Ty2, the hot water is discharged from the hot water storage tank 3, so that the hot water is supplied to the hot water side of the electric mixing valve 4 and the amount of hot water supplied to the hot water supply terminal 42. Rises all at once.

  However, in the present embodiment, the opening degree of the electric mixing valve 4 remains set for a predetermined time Ts1, which is the first predetermined time after the start of hot water supply to the hot water supply terminal 42. ing. This is because it is difficult to detect the timing at which the air from the hot water storage tank 3 escapes, and by setting a sufficient time for the air to escape from the hot water storage tank 3 at a predetermined time Ts1, it is possible to supply hot water to the user more safely. Can be supplied. Therefore, hot water continues to be supplied to the hot water supply terminal 42 with the regulated opening being 50% until the predetermined time Ts1 elapses even after the time Ty2.

  Depending on the set temperature, an opening degree of 50% or less on the hot water side may be acceptable. For example, when the set temperature is 40 ° C., the feed water temperature is 20 ° C., and the temperature of the hot water in the hot water storage tank 3 is 85 ° C., the hot water side opening of the electric mixing valve 4 is about 30%, and the regulated opening Therefore, in that case, the hot water side opening degree is 30% by normal feedback control, and hot water at the set temperature is supplied after time Ty2. The behavior of the electric mixing valve 4 opening at this time moves in the direction from the regulation opening to the opening of the set temperature, and thus moves in the same manner as in the first embodiment. In other words, the regulated opening is an upper limit value, and when the temperature can be controlled below the regulated opening, the opening of the electric mixing valve 4 is controlled as it is.

  On the other hand, in this embodiment, the case where the set temperature is 55 ° C., the feed water temperature is 10 ° C., and the temperature of the hot water in the hot water storage tank 3 is 85 ° C. will be described. Under such conditions, the desired temperature cannot be taken out unless the hot water side opening is about 60%. That is, it moves in an increasing direction from the regulated opening to the set temperature opening. In such a case, from the time Ty1 to the time Ty3 when the predetermined time Ts1 elapses, the hot water side opening of the electric mixing valve 4 is kept at 50%, and the hot water side opening is not made until the time Ty3 is reached. The regulation of the degree is released, and the hot water side opening degree is opened up to 60% by feedback control.

  Thus, even if the supply of high-temperature water is restored at time Ty2 and high-temperature water is supplied from the hot water storage tank 3 to the electric mixing valve 4, the time required to provide a regulated opening for the hot water side opening and further to continuously discharge hot water. Since the regulated opening is maintained until the predetermined time Ts1 elapses, hot water is not supplied to the hot water supply terminal 42 until the air is surely exhausted from the hot water storage tank 3. The predetermined time Ts1 is set in advance as a predetermined time (for example, about 2 minutes), but is not uniquely determined, and is set to a time suitable for the capacity of the hot water storage tank and the configuration of the water heater. can do.

(Embodiment 3)
Since the configuration diagram of the hot water storage type hot water heater in the third embodiment is the same as the configuration diagram of the hot water storage type water heater in the first embodiment, the same reference numerals as those in the first embodiment will be used. In the third embodiment, the condition for canceling the restriction of the hot water side opening is different from that in the second embodiment. In the second embodiment, the electric mixing valve 4 is controlled by providing a hot water side opening degree until the continuous hot water elapses for a predetermined time Ts1, but in the third embodiment, intermittent hot water is supplied. The control of the electric mixing valve 4 when this occurs will be described.

  Usually, when a user discharges hot water from a hot water supply terminal, it is assumed that the user uses the hot water continuously. On the other hand, a serviceman or the like may intermittently discharge hot water from the hot water supply terminal for repair or the like. For this reason, the air accumulated in the upper part of the hot water storage tank 3 is discharged after several hot water discharges without continuous hot water, so that there is no air in the upper part of the hot water storage tank 3. If a regulated opening is provided for the opening, the usability of the user may be impaired. Therefore, in the third embodiment, the restriction opening provided in the electric mixing valve 4 is released even when intermittent hot water is generated.

Normally, when hot water from the hot water supply terminal 42 is stopped, the opening degree of the electric mixing valve 4 is set to the intermediate position, so that the opening degree of the electric mixing valve 4 is kept open at time Tz1. However, since the control of the electric mixing valve 4 is feedback controlled based on the temperature detected by the temperature sensor 41 installed on the downstream side, based on the temperature detected by the temperature sensor 41. The opening degree of the electric mixing valve 4 is controlled. In the present embodiment, the opening of the electric mixing valve 4 while hot water supply is stopped is set to the intermediate position, but the present invention is not limited to this, and there is a problem even if the water side is fully opened or other predetermined position. There is no.

  Next, the release of the restriction opening degree of the electric mixing valve 4 during intermittent hot water will be described. FIG. 5 is a control flow diagram of the electric mixing valve 4. First, at time Tz1, the hot water supply to the hot water supply terminal is detected. Then, when the hot water is intermittently discharged by a serviceman or the like, the hot water is discharged several times after the time Tz1, and during this time, the air accumulated in the upper part of the hot water storage tank is released.

  Then, when the temperature detected by the temperature sensor 46a of the hot water storage tank 3 when starting hot water at time Tz1 is 85 ° C., the upper limit value of the hot water side opening of the electric mixing valve 4 is 50 based on FIG. %. Therefore, after the detection of the hot water to the hot water supply terminal at the time Tz1, until the predetermined time Ts2 which is the second predetermined time elapses, a restriction opening to the hot water side is provided, and the time Tz2 when the predetermined time Ts2 elapses. When hot water is supplied thereafter, there is no restriction on the hot water side opening of the electric mixing valve 4.

  For example, when the user starts hot water supply at time Tz3 after time Tz2, the restriction on the hot water side opening of the electric mixing valve 4 is released because the restriction on the hot water side opening of the electric mixing valve 4 is released. When it is necessary to open more to the hot water side, the opening degree of the electric mixing valve 4 is adjusted beyond the restriction opening degree.

  As described above, as in the third embodiment, until the predetermined time Ts2 elapses from the time Tz1 at which the first hot water was detected, the hot water side opening of the electric mixing valve 4 is restricted, and the predetermined time Ts2 When the time elapses, it is possible to provide a hot water heater with extremely high usability by releasing the restriction provided on the hot water side opening of the electric mixing valve 4. The predetermined time Ts2 is set in advance as a predetermined time (for example, about 5 minutes), but is not uniquely determined, and is set to a time suitable for the capacity of the hot water storage tank and the configuration of the water heater. can do.

(Embodiment 4)
Since the configuration diagram of the hot water storage type hot water heater in the fourth embodiment is the same as the configuration diagram of the hot water storage type water heater in the first embodiment, the same reference numerals as those in the first embodiment will be used. In Embodiment 1 to Embodiment 3, although the independent hot water supply to the hot water supply terminal 42 was demonstrated, in Embodiment 4, it is about control of the electric mixing valve 4 at the time of simultaneous hot water discharge to the bathtub 5 and the hot water supply terminal 42. explain.

  As shown in FIG. 1, a bath hot water supply pipe 34 is provided branching from the hot water supply pipe 32. Therefore, when the hot water is filled in the bathtub 5, the hot water discharged from the hot water discharge pipe 32 passes through the bath hot water supply pipe 34 and is temperature-controlled by the electric mixing valve 8 and supplied to the bathtub 5. On the other hand, when hot water is supplied to the hot water supply terminal 42, the hot water discharged from the hot water discharge pipe 32 is temperature-controlled by the electric mixing valve 4 and supplied to the hot water supply terminal 42.

  That is, when the supply of hot water to both the hot water supply terminal 42 and the bathtub 5 is started, since the hot water discharge pipe 32 discharged from the hot water storage tank 3 is one, the electric mixing valves 4 and 8 are disposed on the downstream side of each. Although it is controlled based on the temperature detected by the provided temperature sensors 41 and 81, the hot water is discharged to both the bathtub 5 and the hot water supply terminal 42, so that it is supplied to the hot water side of the electric mixing valve rather than at the time of single hot water. The amount of hot water to be reduced is reduced, and each electric mixing valve is controlled to open to the hot water side.

Therefore, if regulation of the hot water side opening degree is provided at the time of simultaneous hot water discharge, the problem that the temperature cannot be controlled by the electric mixing valve occurs. This is because hot water at the set temperature was created even when the hot water side opening was 50% or less at the time of single hot water, but the hot water supply amount to the hot water side opening was reduced during simultaneous hot water and the hot water side opening was 50% or more. Therefore, in the fourth embodiment, the restriction on the hot water side opening degree is released at the time of simultaneous hot water supply.

  Normally, when the hot water supply from the hot water supply terminal 42 is stopped, the opening degree of the electric mixing valve 4 is set to the intermediate position, so that the opening degree of the electric mixing valve 4 is kept open at the time Tv1. However, since the control of the electric mixing valve 4 is feedback controlled based on the temperature detected by the temperature sensor 41 installed on the downstream side, based on the temperature detected by the temperature sensor 41. The opening degree of the electric mixing valve 4 is controlled. In the present embodiment, the opening of the electric mixing valve 4 while hot water supply is stopped is set to the intermediate position, but the present invention is not limited to this, and there is a problem even if the water side is fully opened or other predetermined position. There is no.

  First, when hot water discharge from the hot water supply terminal 42 is started, a regulated opening is provided for the hot water side opening while continuous hot water is continued for a predetermined time Ts1 in the single operation. The regulated opening is determined based on FIG. However, when the hot water filling operation is started by the remote control device 9 or 95 before the predetermined time Ts1 elapses when the hot water is continuously discharged in the single operation (when the automatic hot water filling is set, the set time). Then, the hot water filling operation is started), and the electromagnetic valve 83 is opened and hot water filling is started to the bathtub 5.

  FIG. 6 is a flow diagram showing a regulated state of the electric mixing valve 4. As shown in FIG. 6, it is an intermediate position that is a standby opening until time Tv1, but when hot water from the hot water supply terminal 42 is started at time Tv1, a restriction opening is provided, and this restriction opening is set to an upper limit. The electric mixing valve 4 is controlled. In the present embodiment, since the case where the temperature detected by the temperature sensor 46a is 85 ° C. is shown as an example, the restriction opening is set to 50%.

  In the case of single hot water, as shown in the second embodiment, the electric mixing valve 4 is controlled from the time Tv1 to the predetermined time Ts1 with the restriction opening as the upper limit value, but the predetermined time Ts1 has elapsed. It is assumed that the hot water filling operation is started at time Tv2 before starting. At this time, when hot water filling is started at time Tv2, the restriction on the hot water side opening of the electric mixing valve 4 is released. That is, the upper limit value of the restriction opening is canceled without waiting for the time Tv3 when the predetermined time Ts1 elapses.

  By canceling the restriction opening in this way, a hot water heater with high usability can be provided without inconvenience to the user even if the hot water is discharged simultaneously from the bathtub 5 and the hot water supply terminal 42.

(Embodiment 5)
Since the configuration diagram of the hot water storage type hot water heater in the fifth embodiment is the same as the configuration diagram of the hot water storage type water heater in the first embodiment, the same reference numerals as those in the first embodiment will be used. In the first to fourth embodiments, it has been described that the electric mixing valve 4 is controlled by providing a restriction opening. However, in all hot water supply, if the electric mixing valve 4 is provided and controlled, the hot water storage tank 3 is controlled. In spite of the fact that air does not accumulate in the upper part of the slab, the drive of the electric mixing valve 4 is restricted, and it may take time until the temperature required by the user is provided.

  Therefore, in the fifth embodiment, when a regulated opening degree is provided for driving the electric mixing valve 4, the opening degree of the electric mixing valve 4 is set only when there is no hot water for a certain time or longer (a third predetermined time or longer). It is regulated. 7 and 8 are diagrams showing the third predetermined time Ts3 and the hot water supply timing.

Generally, the inside of the hot water storage tank 3 is filled with hot water, and no air is accumulated in the upper part. Therefore, when air accumulates in the upper part of the hot water storage tank 3, for example, when hot water is removed from the hot water storage tank 3 for maintenance, or it is connected to a non-freezing water faucet found in cold districts, etc., the outside air temperature is low. During the night, the water supply to the hot water storage tank 3 is stopped. As a result, air may accumulate in the upper part of the hot water storage tank 3.

  Therefore, in the present embodiment, the regulated opening degree is provided in the electric mixing valve 4 only when there is no hot water to the hot water supply terminal 42 during the third predetermined time Ts3 (for example, 30 minutes). . By controlling in this way, it is limited only when it is assumed that air is accumulated in the upper part of the hot water storage tank 3, and when it is not assumed, the normal electric mixing valve 4 is controlled, so that the usability is improved. Can be made.

  As shown in FIG. 7, if no hot water is discharged from the hot water supply terminal 42 between the end of the previous hot water supply at time Tw1 and the time Tw2 when the predetermined time Ts3 elapses, the time Tw3 after the time Tw2 is reached. When hot water from the hot water supply terminal 42 is detected again, an upper limit value is provided for the hot water side opening of the electric mixing valve 4 for a predetermined time Ts1. And after predetermined time Ts1 is complete | finished, the control opening degree of the upper limit of the hot water side opening degree is cancelled | released.

  Next, as shown in FIG. 8, when hot water is discharged from the hot water supply terminal 42 at a time Tw5 between the end of the previous hot water supply at time Tw1 and the time Tw2 at which the predetermined time Ts3 elapses, The hot water side opening of the mixing valve 4 is controlled without providing an upper limit.

  Also, when the hot water supply to the hot water storage terminal 42 is turned on for the first time, the third predetermined time Ts3 does not exist because there has been no previous hot water supply. For this reason, even when the hot water is supplied to the hot water supply terminal 42 for the first time after the power is turned on, the electric mixing valve 4 is provided with a restriction opening degree.

  This is because once the power is turned off, there is a high possibility that some maintenance has been performed, so there is a possibility that air has accumulated in the upper part of the hot water storage tank 3. By providing the restriction opening at the hot water side opening 4, it is possible to reliably prevent high temperature from coming out of the hot water supply terminal 42.

  As described above, by providing the third predetermined time and limiting it to the first hot water after the power is turned on, it is possible to reliably prevent the hot water from coming out of the hot water supply terminal 42 and to improve the usability. A high hot water storage type water heater can be provided.

(Embodiment 6)
Since the configuration diagram of the hot water storage type hot water heater in the sixth embodiment is the same as the configuration diagram of the hot water storage type water heater in the first embodiment, the same reference numerals as those in the first embodiment will be used. In the sixth embodiment, the control of the electric mixing valve 4 when the hot water filling operation is performed on the bathtub 5 before the hot water supply operation is performed during the third predetermined time T3 will be described.

  As shown in FIG. 1, when hot water is taken out from the hot water storage tank 3, whether hot water is filled in the bathtub 5 or when the hot water is discharged to the hot water supply terminal 42, the hot water is supplied through the hot water discharge pipe 32. Take out. Therefore, the air accumulated in the upper part of the hot water storage tank 3 is discharged to the bathtub 5 even when the hot water filling operation is performed.

  Therefore, in the sixth embodiment, as described in the fifth embodiment, during the third predetermined time Ts3, even if there is no hot water to the hot water supply terminal 42 during the third predetermined time Ts3. When there is a hot water filling operation, no restriction opening is provided for the hot water side opening of the electric mixing valve 4.

FIG. 9 is a diagram showing the relationship between the opening of the mixing valve, the hot water supply operation, and the bath operation in the sixth embodiment. Normally, if there is no hot water from the hot water supply terminal 42 for a predetermined time Ts3 after the previous hot water supply terminal 42 stops, the electric mixing valve 4 is opened for the next hot water supply from the hot water supply terminal 42. As shown in FIG. 9, when a hot water filling operation occurs during a predetermined time Ts3, as shown in FIG. I am trying not to.

  First, when the previous hot water supply operation is stopped at time Tu1, the hot water filling operation to the bathtub 5 starts at time Tu3 until the time Tu2 when the predetermined time Ts3 elapses. Then, even if air has accumulated in the upper part of the hot water storage tank 3, the air in the upper part of the hot water storage tank 3 is discharged to the bathtub 5 by performing the hot water filling operation on the bathtub 5. When the hot water filling operation is completed at time Tu4 and the hot water supply from the hot water supply terminal 42 is started at the time Tu5 after the time Tu4, the hot water discharge interval from the hot water supply terminal 42 has passed the predetermined time Ts3. Since hot water filling operation is performed and air does not accumulate in the upper part of the hot water storage tank 3, no restriction opening is provided for the hot water side opening of the electric mixing valve 4.

  In this way, even if the hot water discharge interval from the hot water supply terminal 42 is open for a predetermined time Ts3, if the hot water filling operation is performed during that time, the hot water side of the electric mixing valve 4 will be used in the next hot water supply to the hot water supply terminal 42. The user's usability can be improved without restricting the opening degree.

  Further, when hot water is discharged from the hot water supply terminal 42 after the elapse of the predetermined time Ts3 from the end of the hot water filling operation, if the hot water side opening degree of the electric mixing valve 4 is regulated, the hot water supply terminal 42 can be more reliably connected. It is possible to prevent hot water from being discharged.

(Embodiment 7)
Since the configuration diagram of the hot water storage type hot water heater in the seventh embodiment is the same as the configuration diagram of the hot water storage type water heater in the first embodiment, the same reference numerals as those in the first embodiment will be used. In the seventh embodiment, a case where the user desires high-temperature hot water will be described.

  The user can set the hot water supply temperature with the remote control device 9 or the remote control device 95. If it is normal hot water supply, it is preferable to set and use about 40 degreeC, and if a user discharges hot water from the hot water supply terminal 42, it will be electrically operated so that the temperature detected by the temperature sensor 41 becomes set temperature. The mixing ratio of the mixing valve 4 is changed. For example, when the user sets the hot water supply temperature to 40 ° C., the mixing ratio of the electric mixing valve 4 is controlled so that the temperature detected by the temperature sensor 41 is 40 ° C.

  However, usually, there are many cases where a mixing tap is used for the hot water supply terminal 42, and when the hot water supply terminal 42 is a mixing plug, hot water and low temperature hot water are mixed by the electric mixing valve 4 and then the hot water supply terminal 42. Then, again, hot water and water are mixed and discharged. For this reason, some users are considering using hot water and water again at the hot water supply terminal 42, so that some users use the set temperature higher than normal. There is a person (for example, 60 ° C. is set, mixed at an appropriate temperature at the hot water supply terminal 42 and discharged). In addition, when the user wants hot water in an emergency, the hot water supply temperature may be set high by the remote control device 9 or the remote control device 95.

  In such a case, it is determined that the user desires hot water, and the upper limit value of the hot water side opening of the electric mixing valve 4 is not provided. That is, the limit of the hot water side opening of the electric mixing valve 4 is determined according to the hot water supply temperature set by the remote control device 95 or the remote control device 9.

Specifically, when the hot water supply temperature set by the remote control device 9 or the remote control device 95 is equal to or higher than the predetermined hot water supply temperature Tk, the upper limit value of the hot water side opening of the electric mixing valve 4 is not provided and is lower than the predetermined hot water supply temperature Tk. Sometimes, the upper limit value of the hot water side opening of the electric mixing valve 4 is provided based on the table shown in FIG. For example, when the predetermined hot water supply temperature Tk = 60 ° C., when the user sets the hot water supply temperature to 60 ° C. with the remote control device, the upper limit value of the hot water side opening of the electric mixing valve 4 is not provided,
When the hot water supply temperature is set to 40 ° C., the upper limit value of the hot water side opening of the electric mixing valve 4 is provided based on the table of FIG.

  In this way, by limiting the hot water side opening of the electric mixing valve 4 according to the set hot water temperature, it is possible to provide a hot water storage type hot water heater that is easy to use.

  Furthermore, the user's hot water supply terminal 42 may not be a mixing tap. In such a case, even if the hot water temperature set by the remote control device is equal to or higher than the predetermined hot water temperature Tk, the hot water is supplied to the hot water supply terminal 42 at once after the air has escaped from the upper part of the hot water storage tank 3, Depending on the temperature of the hot water storage tank, hot water may be discharged from the hot water supply terminal 42.

  Therefore, only when the hot water storage tank temperature is below a certain temperature, the restriction on the hot water side opening of the electric mixing valve 4 is released. This is because when the set hot water temperature is set to 60 ° C. with the remote control device, the temperature detected by the temperature sensor 46a is detected to be 70 ° C. even if the set hot water temperature is equal to or higher than the predetermined hot water temperature Tk (= 60 ° C.). This is because there is a possibility that 70 ° C. hot water may be supplied to the hot water supply terminal 42. In the present embodiment, when the temperature T detected by the temperature sensor 46a is equal to or higher than the temperature obtained by adding the temperature width Th to the predetermined hot water supply temperature Tk (predetermined remaining hot water temperature), the hot water side of the electric mixing valve 4 The opening is limited.

  Therefore, when the temperature T detected by the temperature sensor 46a that detects the remaining hot water temperature at the uppermost portion of the hot water storage tank 3 is equal to or less than the predetermined hot water supply temperature Tk + temperature range Th (tank temperature ≦ Tk + Th), the temperature is set by the remote control device. When the hot water supply temperature is equal to or higher than the predetermined hot water supply temperature Tk (set temperature ≧ Tk), the restriction on the hot water side opening of the electric mixing valve 4 is released, and the temperature detected by the temperature sensor 46a is the predetermined hot water supply temperature Tk + temperature range Th. At the above time (tank temperature ≧ Tk + Th), even if the hot water temperature set by the remote control device is equal to or higher than the predetermined hot water temperature Tk (set temperature ≧ Tk), the restriction on the hot water side opening of the electric mixing valve 4 is released. In order not to impair the usability of the user.

  To explain using specific numerical values, when the predetermined hot water supply temperature Tk is 60 ° C. and the temperature width Th is 10 ° C., when the hot water supply temperature is set to 60 ° C. with the remote control device, the temperature detected by the temperature sensor 46a is: When the temperature is 70 ° C. (60 ° C. + 10 ° C.) or lower, the restriction on the hot water side opening of the electric mixing valve 4 is released. When the temperature is higher than 70 ° C. (60 ° C. + 10 ° C.), the electric mixing valve 4 Do not remove the restriction on the hot water side opening.

  Thus, even if it respond | corresponds to the temperature of the hot water storage tank in addition to the set hot water temperature, the hot water storage type hot water heater which is easy to use can be provided by limiting the hot water side opening of the electric mixing valve 4. . The value of the predetermined hot water supply temperature Tk is not limited to the above numerical value, and is set for each hot water heater. In the present embodiment, the predetermined remaining hot water temperature is the temperature obtained by adding the temperature range Th to the predetermined hot water supply temperature Tk. However, the present invention is not limited to this, and there is no problem even if a predetermined temperature is set.

(Embodiment 8)
Since the configuration diagram of the hot water storage type hot water heater in the eighth embodiment is the same as the configuration diagram of the hot water storage type water heater in the first embodiment, the same reference numerals as those in the first embodiment will be used. In the eighth embodiment, the upper limit value of the hot water side opening of the electric mixing valve 4 is canceled based on the flow rate detected by the flow rate sensor.

  In the embodiments so far, when the first predetermined time Ts1 has elapsed for continuous hot water, and when the second predetermined time Ts2 has elapsed for intermittent hot water, the hot water side opening of the electric mixing valve 4 has increased. However, in this embodiment, the upper limit value is canceled based on the flow rate detected by the flow rate sensor 72.

  That is, when the flow rate detected by the flow rate sensor 72 is greater than or equal to a predetermined flow rate, it is determined that all the air above the hot water storage tank 3 has been exhausted, and the upper limit value of the hot water side opening of the electric mixing valve 4 is canceled. Yes. This is because the flow rate from the electric mixing valve 4 decreases to some extent while there is air in the upper part of the hot water storage tank 3, but after the air in the upper part of the hot water storage tank 3 is discharged, the electric mixing valve 4 This is because the flow rate increases.

  Therefore, when the flow rate detected by the flow rate sensor 72 is lower than the predetermined flow rate Qx (L / min), it is determined that air is supplied to the hot water side of the electric mixing valve 4, and the predetermined flow rate Qx (L / Min), it is determined that hot water is normally supplied to the hot water side and the water side of the electric mixing valve 4, and after the predetermined flow rate Qx (L / min) is detected, The upper limit value provided on the hot water side of the mixing valve 4 is canceled.

  Further, the amount of hot water discharged from the hot water supply terminal 42 varies depending on the setting of the hot water supply terminal 42. This is because the predetermined flow rate Qx (L / min) may not be detected for a long time unless the user intentionally puts out only a small amount of hot water from the hot water supply terminal 42 (when the hot water supply terminal 42 is a faucet). , When you only twist the faucet a little).

  Therefore, when the flow rate sensor 72 detects the timing at which air escapes from the upper portion of the hot water storage tank 3, the flow rate sensor 72 is not used to determine the timing at which air escapes from the hot water storage tank 3, but from the first embodiment. As shown in the form 7, it is preferable to make a judgment by combining the judgment by time.

  By configuring as described above, it is possible to more accurately detect the timing at which the discharge of air from the hot water storage tank 3 is completed, and it is possible to discharge hot water at a hot water supply temperature desired by the user more quickly. In addition, the predetermined flow rate in the eighth embodiment is appropriately changed according to the performance of the hot water storage type water heater, and is not uniquely determined.

  As described above, the hot water storage type hot water heater of the present invention is an integrated heat pump type hot water heater, a separate type heat pump type hot water heater configured separately, and a direct hot water type heat pump that can discharge hot water heated by a heat exchanger for hot water supply as it is. The present invention can also be applied to various heat pump water heaters such as water heaters, electric water heaters using an electric heater as a heat source, and hot water storage water heaters combining oil and gas as a heat source.

DESCRIPTION OF SYMBOLS 1 Tank unit 2 Heat pump unit 3 Hot water storage tank 4 Electric mixing valve 5 Bathtub 9 Remote control device (bathroom)
32 Hot water pipe 41 Temperature sensor 42 Hot water supply terminal 95 Remote control device (other than bathroom)

Claims (9)

Hot water storage tank for storing hot water, residual hot water temperature detecting means for detecting the temperature of the hot water in the hot water storage tank, a hot water outlet pipe for extracting hot water from the hot water storage tank, a water supply pipe for supplying water to the hot water storage tank, and the water supply pipe And a mixing means for connecting the hot water pipe and the terminal water supply pipe to mix the hot water and the hot water of the mixing means based on the temperature detected by the remaining hot water temperature detecting means. A hot water storage type water heater characterized by regulating the side opening. A flow sensor for detecting the amount of hot water supplied to the hot water supply terminal, and when the flow sensor detects the flow of hot water continuously for a first predetermined time after the flow sensor detects the flow of hot water, The hot water storage type water heater according to claim 1, wherein the restriction on the side opening is released. A flow rate sensor for detecting a hot water supply amount to a hot water supply terminal is provided, and the regulation of the hot water side opening degree is released after a second predetermined time has elapsed after the flow rate of the hot water is detected by the flow rate sensor. Or a hot water storage type water heater according to 2; The hot water storage type hot water supply according to any one of claims 1 to 3, wherein the hot water side opening of the mixing means is restricted only when a state where no hot water is supplied to the hot water supply terminal continues for a third predetermined time. Machine. When configured to allow hot water filling from the hot water storage tank to the bathtub, and equipped with a bath flow sensor for detecting the flow rate to the bathtub, when the flow rate is detected by the bath flow sensor during hot water supply to the hot water supply terminal The hot water storage type hot water supply device according to any one of claims 1 to 4, wherein the restriction on the hot water side opening of the mixing means is released. It is configured so that hot water can be filled from the hot water storage tank to the bathtub, and is provided with a bath flow rate sensor that detects the flow rate to the bathtub, and until a third predetermined time elapses since the last hot water from the hot water supply terminal Furthermore, when the flow rate is detected by the bath flow rate sensor, the hot water side opening degree of the mixing means is not regulated. A temperature setting means is provided for setting a tapping temperature to the hot water supply terminal, and when the tapping temperature set by the temperature setting means is equal to or higher than a predetermined hot water supply temperature, the restriction of the hot water side opening of the mixing means is released. The hot water storage type water heater according to any one of claims 1 to 6. Even if the tapping temperature set by the temperature setting means is equal to or higher than the predetermined hot water supply temperature, if the temperature detected by the remaining hot water temperature detecting means is equal to or higher than the predetermined remaining hot water temperature, the hot water side opening of the mixing means is regulated. The hot water storage type water heater according to claim 7, wherein A flow rate sensor for detecting the amount of hot water supplied to the hot water supply terminal is provided, and when the flow rate detected by the flow rate sensor detects a predetermined flow rate or more, the restriction on the hot water side opening of the mixing means is released. The hot water storage type water heater according to any one of 1 to 8.