JP2011242019A - Hot-water storage type hot-water supply equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide hot-water storage type hot-water supply equipment which determines and displays a failure of a water supply check valve provided in a water supply pipe.SOLUTION: In the hot-water storage type hot-water supply equipment in which tap water flows into a lower part of a hot-water storage tank 2 from a water supply pipe 8 provided with a water supply check valve 46 so that high-temperature water of the upper part of the hot-water storage tank 2 flows out from a hot-water running pipe 7 at the upper end part of the hot-water storage tank 2 to a hot-water supply mixing valve 27, when a hot-water supply temperature detected by a hot-water supply temperature sensor 30 does not reach a hot-water supply setting temperature after starting to supply hot water, operations in which the water side is stepwise throttled and the hot-water side is opened in the hot-water supply mixing valve 27 are repeated, and also when a flow rate detected by a hot-water supply flow rate sensor 31 becomes equal to or less than a given flow rate during the operations, it is determined and displayed that a failure occurs in the water supply check valve 46 provided in the water supply pipe 8. Therefore, a user understands that the hot water does not run because of the failure of the water supply check valve 46, and makes contact with a repair shop to get the valve repaired quickly.

Description

  The present invention relates to a hot water storage type hot water supply apparatus having a function of determining a failure of a hot water supply check valve.

  Conventionally, in this type, a hot water supply device that can be used safely without hot water being discharged from the hot water mixing valve at the start of hot water supply or when hot water is supplied is provided. For example, a first check valve is provided in the high-temperature water path and a second check valve is provided in the low-temperature water path so that it can be used safely (for example, Patent Document 1).

In this conventional type, when the second check valve is stuck and the forward opening becomes worse due to deterioration of the seal portion or adhesion of chalk in the second check valve (hereinafter referred to as “blocking failure”). ”), There is an increased possibility that abnormally high temperature water will flow out while using hot water, causing danger to the user.
For this reason, there is a measure that prohibits hot water supply or warns of danger by determining that the second check valve is closed when a hot water outflow is detected by the hot water temperature sensor.
However, in this method, since a similar symptom is detected even when the hot water mixing valve fails, there is a problem in that it cannot be determined whether the hot water mixing valve is faulty or the second check valve is closed. .

Therefore, the present applicant has filed an application for a hot water storage type hot water supply apparatus having a check valve failure determination function. (For example, Patent Document 2)
Normally, a hot water supply at a set temperature based on the valve opening of the hot water supply mixing valve was expected by the user, but when an abnormally hot water exceeding the set temperature flows out against the expectation from the hot water supply demand, If the detected value of the hot water supply temperature sensor disposed on the outlet side of the mixing valve exceeds a predetermined difference from the set temperature and detects abnormally high temperature water, the second check valve is determined to be faulty.

JP 2001-289507 A JP 2007-155194 A

  By the way, in this conventional one, when abnormally high temperature water exceeding the set temperature flows out against expectations from hot water supply demand, it is determined whether or not the second check valve is faulty. In order to prevent hot water supply, when starting hot water supply from the state where the hot water supply valve is fully open and the hot water side is fully closed at the start of hot water supply, the water supplied to the hot water supply mix valve is initially supplied as hot water, When the flow rate sensor confirms running water, the hot water mixing valve is operated to open the hot water side while narrowing the water side to try to supply hot water at a set temperature.

 At this time, if the water supply check valve is malfunctioning, water is not supplied to the lower part of the hot water storage tank, so high-temperature water is not supplied from the upper part of the hot water storage tank to the hot water supply mixing valve. Since the temperature does not rise, the hot water mixing valve is operated to continue the operation to open the hot water side while narrowing the water side, and finally the hot water mixing valve is fully closed on the water side and fully opened on the hot water side. In this state, there is a problem that there is no hot water supply from the hot water supply mixing valve without displaying an error.

  This invention pays attention to this point and solves the above-mentioned problems. In particular, in claim 1, the water supply pipe is connected to the lower end portion and the hot water discharge pipe for discharging the hot water stored in the hot water is provided at the upper end portion. A hot water storage tank connected to the hot water supply pipe, a heating water check valve provided in the water supply pipe, heating means for heating the hot water in the hot water storage tank to a high temperature, and hot water in the upper part of the hot water tank supplied from the hot water discharge pipe; A hot water mixing valve that mixes the water supplied from the water supply bypass pipe branched from the water supply pipe, a hot water temperature sensor that detects the hot water temperature after mixing of the hot water mixing valve, and a hot water flow rate sensor that detects the hot water flowing in the outlet pipe And a hot water supply control unit that controls the drive of the hot water mixing valve so as to compare the detected temperature of the hot water temperature sensor with the hot water set temperature set by the remote controller to provide hot water at the hot water set temperature In When the hot water temperature detected by the hot water temperature sensor does not reach the set hot water temperature after starting the hot water supply, the hot water controller repeats the operation of opening the hot water side by gradually reducing the hot water mixing valve. When the flow rate detected by the hot water supply flow rate sensor falls below a predetermined flow rate, it is determined that the water supply check valve has failed and is displayed.

  Further, in the hot water storage type hot water supply apparatus according to claim 2, in particular, the hot water storage tank in which the water supply pipe is connected to the lower end and the hot water discharge pipe for discharging the hot water being stored is connected to the upper end. A hot water pipe check valve provided in the hot water pipe, a heating means for heating hot water in the hot water storage tank to a high temperature, and a hot water supplied from the hot water pipe and branched from the hot water and the water supply pipe. A hot water mixing valve that mixes the water supplied from the water supply bypass pipe, a water supply bypass pipe check valve provided in the water supply bypass pipe, a hot water temperature sensor that detects the hot water temperature after mixing of the hot water mixing valve, and The hot water supply flow sensor for detecting hot water flowing in the hot water discharge pipe, the detected temperature of the hot water temperature sensor and the hot water set temperature set by the remote controller are compared, and the drive of the hot water mixing valve is controlled so as to provide hot water at the hot water set temperature. Hot water supply system In the hot water storage type hot water supply apparatus, the hot water supply control unit, after the start of hot water supply, when the hot water temperature detected by the hot water temperature sensor does not reach the hot water set temperature, The operation of squeezing and opening the hot water side is repeated, and when the flow rate detected by the hot water supply flow rate sensor falls below a predetermined flow rate during the operation, it is determined that the hot water tap check valve has failed.

  According to the first aspect of the present invention, after the hot water supply is started, when the hot water temperature detected by the hot water temperature sensor does not reach the hot water set temperature, the operation of opening the hot water side by gradually reducing the hot water mixing valve on the water side is repeated. At the same time, when the flow rate detected by the hot water supply flow sensor becomes lower than the predetermined flow rate during the operation, it is determined that the water supply check valve provided in the water supply pipe has failed. It can be seen that hot water does not come out because of a malfunction, and a repair contractor can be contacted for prompt repair.

  According to the hot water storage type hot water supply apparatus according to claim 2 of the present invention, after the hot water supply is started, when the hot water temperature detected by the hot water temperature sensor does not reach the set hot water temperature, the hot water mixing valve is gradually throttled to the water side. When the hot water side is repeatedly opened and the flow rate detected by the hot water flow rate sensor falls below the predetermined flow rate during the operation, the hot water pipe check valve is judged to be broken and displayed. It can be seen that hot water does not come out because the pipe check valve is broken, and it can be repaired quickly by contacting a repair shop.

The schematic block diagram of the hot water storage type hot-water supply apparatus which shows one Embodiment of this invention. The flowchart figure of the same embodiment.

Next, one embodiment of the hot water storage type hot water supply apparatus of the present invention will be described with reference to the drawings.
Embodiments of the present invention will be described below with reference to the drawings.
1 is a hot water storage tank unit having a hot water storage tank 2 for storing hot water, 3 is a heat pump unit as a heating means for heating hot water stored in the hot water storage tank 2, and 4 is provided in a kitchen or a washroom. A hot-water tap, 5 is a remote control for remotely operating the hot-water storage type hot-water supply device, and 6 is a bathtub.

  The hot water storage tank 2 in the hot water storage tank unit 1 is connected to a hot water discharge pipe 7 for discharging hot water at the upper end and a water supply pipe 8 for supplying tap water to the lower end. Further, a heat pump forward pipe 9 connecting the heat pump unit 3 from the lower part of the hot water storage tank 2 with a pipe and a heat pump return pipe 10 connecting the heat pump unit 3 to the upper part of the hot water storage tank 2 with a pipe are connected.

  In the heat pump unit 3, a heat pump cycle 15 including a compressor 11, a refrigerant water heat exchanger 12 as a condenser, an electronic expansion valve 13, and a forced air-cooled evaporator 14 is installed. 2 is transported to the heat pump unit 3 from the heat pump forward pipe 9 and is heated by the refrigerant water heat exchanger 12 and transported from the heat pump return pipe 10 to the hot water storage tank 2 in the middle of the heat pump forward pipe 9. A heat-pump control unit 17 that is installed and controls driving thereof is provided.

  Reference numeral 18 denotes a bath heat exchanger made of a stainless steel serpentine tube for heating the hot water in the bathtub 6, which is arranged in the upper part of the hot water storage tank 2. The bath heat exchanger 18 includes a bath outlet pipe 19 and A bath circulation circuit 22 comprising a bath return pipe 21 provided with a bath circulation pump 20 for conveying bath water is connected, and hot water in the bath 6 is heated by high-temperature water in the hot water storage tank 2 to keep warm or retreat. Done.

  A bath return pipe temperature sensor 23 detects the temperature of the bath water flowing into the bath heat exchanger 18 from the bath return pipe 21, and 24 flows out of the bath heat exchanger 18 and flows into the bathtub 6 from the bath return pipe 19. It is a bath pipe temperature sensor which detects the temperature of bathtub water.

  Reference numeral 25 denotes a bath three-way valve installed between the bath return pipe temperature sensor 23 of the bath return pipe 21 and the bath heat exchanger 18, and reference numeral 26 denotes the bath outlet pipe 19 by changing the valve opening degree of the bath three-way valve 25. This is a bath circulation bypass pipe connected so that hot water flows into the pipe between the bath temperature sensor 24 and the bath heat exchanger 18.

  A hot water supply mixing valve 27 mixes the hot water conveyed in the hot water supply pipe 7 and the water supply in the water supply bypass pipe 28 branched from the water supply pipe 8, and a hot water supply thermistor provided in the hot water supply pipe 29 connected downstream thereof. The valve opening degree is adjusted so that the temperature detected by the hot water supply temperature sensor 30 consisting of the above becomes the hot water supply set temperature set by the user with the remote controller 5, and 31 is a hot water flow rate sensor for detecting the flow of hot water to be supplied. is there.

  32 is a hot water pipe that branches off from the hot water supply pipe 29 and communicates with the bath return pipe 21. The hot water pipe 32 includes a hot water valve 33 that starts and stops hot water filling the bathtub 6, and a hot water filling valve 33. A bath flow rate counter 34 that counts the amount of hot water filling and a check valve 35 that prevents the hot water in the bathtub 6 from flowing back to the hot water supply pipe 29 are provided, and hot water in the hot water storage tank 2 is supplied to the bathtub 6. The hot water filling pipe 32 is also used when the hot water is poured directly and refilled.

  A plurality of hot water storage temperature sensors 36 are arranged in the vertical direction of the hot water storage tank 2. The hot water storage tank 2 has 36 a, 36 b, 36 c, 36 d, 36 e in order from the upper direction. The amount of residual heat in the hot water storage tank 2 is detected, and the temperature distribution in the vertical direction of the hot water storage tank 2 is detected.

  The remote controller 5 is provided with a hot water supply temperature setting switch 37 for setting the hot water supply set temperature and a bath temperature setting switch 38 for setting the bath set temperature. Bath automatic switch 39 for filling the amount of hot water set by a hot water filling amount setting switch (not shown), a reheating switch 40 for chasing the bath water, a set value, a current operating state, and an abnormal state Is displayed.

  42 receives the input of each sensor installed in the hot water storage tank unit 1 and controls the drive of each actuator, and in particular, the hot water mixing valve 27 so that the hot water set temperature and the hot water temperature detected by the hot water temperature sensor 30 coincide. This is a hot water supply control unit comprising a microcomputer that transmits output pulses to the stepping motor 43. Therefore, the remote controller 5 is connected to the hot water supply control unit 41 by wireless or wired, and the user can set the desired hot water supply set temperature and bath set temperature. Further, the hot water control unit 41 sets the hot water supply after 30 seconds of hot water supply. When the difference between the temperature and the actual hot water temperature detected by the hot water temperature sensor 30 is longer than the predetermined temperature here plus or minus 2 ° C. on the high temperature side and the low temperature side for a predetermined time here 10 seconds or more, If the stepping motor 43 is moved by an amount that is 0% of the valve opening, which is the reference point, after the hot water supply is finished, the valve stops at 0% and initialization is performed. This is avoided and returned to the normal hot water supply mixing valve 27.

  44 is an overpressure relief valve that operates when the pressure in the hot water storage tank 2 exceeds a predetermined value, and 45 is a pressure reducing valve that is adjusted to supply tap water to the hot water storage tank 2 at a constant pressure. , 46 is a water supply check valve which is provided on the hot water storage tank 2 side from the branch portion of the water supply bypass pipe 28 and prevents hot water flowing backward from the hot water storage tank 2 side to the water supply bypass pipe 28 side.

Next, the operation of this embodiment will be described.
When the hot water storage temperature sensor 36 detects that there is not enough hot water in the hot water storage tank 2 the next day in the midnight power time zone (for example, from 23:00 to 7:00 on the next day), the hot water supply control unit 42 A hot water boiling start command is issued to the control unit 17. Upon receiving the command, the heat pump controller 17 drives the heat pump circulation pump 15 to heat the low-temperature water in the hot water storage tank 2 flowing in the heat pump forward pipe 9 by the refrigerant water heat exchanger 12, and from the heat pump return pipe 10 to the hot water storage tank 2. Returning to the upper part, the hot water is stored one by one from the upper part of the hot water storage tank 2 in order. When the hot water storage temperature sensor 36 detects that the necessary amount of heat has been stored, the hot water supply control unit 42 issues a boiling stop command to the heat pump control unit 17, and the heat pump control unit 17 stops driving the heat pump circulation pump 15. Finish boiling.

  Next, the hot water supply operation will be described. Tap water flows from the water supply pipe 8 into the hot water storage tank 2 by opening the hot water tap 4. Then, the hot water stored in the hot water storage tank 2 flows through the hot water outlet pipe 7 and flows into the hot water supply mixing valve 27, and the hot water control unit 42 adjusts the valve opening degree of the hot water mixing valve 27 so that the hot water supply setting temperature is reached. The hot water is discharged by mixing with the low temperature water in the water supply bypass pipe 28. Moreover, the hot water supply is completed by closing the hot-water tap 4.

  Next, the hot water filling operation to the bathtub 6 will be described. When the bath automatic switch 39 of the remote controller 5 is operated, the hot water supply control unit 42 opens the hot water filling valve 33. Then, the hot water adjusted to the bath set temperature by the hot water supply mixing valve 27 flows into the bathtub 6 from the hot water filling pipe 32 through the bath return pipe 21, and hot water filling is performed, and a bath provided in the middle of the hot water filling pipe 32. When the flow rate counter 34 finishes counting the predetermined flow rate, the hot water supply control unit 42 closes the hot water filling valve 33 and the hot water filling operation is completed.

Next, failure detection of the water supply check valve 46 by the hot water supply control unit 42 during the hot water supply operation will be described with reference to the flowchart of FIG.
First, when the hot-water tap 4 is opened (S1), tap water is supplied from a water supply bypass pipe 28 provided in a kitchen or a washroom to the hot water supply mixing valve 27. At this time, the hot water supply mixing valve 27 is in a standby state of 100% water. Therefore, the tap water supplied to the hot water supply mixing valve 27 from the water supply bypass pipe 28 flows from the hot water supply mixing valve 27 to the hot water supply pipe 29 as it is.

When the hot water supply flow rate sensor 31 detects tap water flowing through the hot water supply pipe 29, that is, water or hot water having a predetermined flow rate or higher (S2), the expected mixing valve opening obtained from the learning water supply temperature of the previous day and the hot water storage temperature of the hot water storage tank 2 The hot water mixing valve 27 is operated. (S3)
As a result, the amount of tap water supplied from the water supply bypass pipe 28 to the hot water supply mixing valve 27 is reduced, and the hot water stored in the hot water storage tank 2 flows into the hot water storage tank 2 from the hot water supply pipe 8 and the hot water stored in the hot water storage tank 2 enters the hot water supply pipe 7. The hot water and the tap water from the water supply bypass pipe 28 are mixed by the hot water supply mixing valve 27 and flow into the hot water supply pipe 29.

  Then, the hot water supply temperature of the hot water flowing through the hot water supply pipe 29 detected by the hot water supply temperature sensor 30 is compared with the set temperature set (S4), and if the set temperature is higher, the hot water supply mixing valve 27 is opened to the hot water side by one step. If the set temperature and the hot water supply temperature are the same (S6), the opening degree of the hot water supply mixing valve 27 is maintained as it is (S7). If the hot water supply temperature is higher, the hot water supply mixing valve 27 is maintained. Is operated in a direction to open the water side one step. (S8)

  When the hot water flow rate sensor 31 detects water or hot water at a predetermined flow rate or higher again in the hot water supply pipe 29 (S9), it is checked whether the hot water tap 4 is closed (S10). The valve 27 is operated in a standby state of 100% water (S11), and the hot water supply is terminated. (S12)

  By the way, if the water supply check valve 46 is out of order, when the hot water supply mixing valve 27 is in a standby state of 100% water, tap water supplied from the water supply bypass pipe 28 to the hot water supply mixing valve 27 flows into the hot water supply pipe 29 as it is. The hot water supply flow sensor 31 detects a flow rate that is equal to or higher than a predetermined flow rate. However, if the ratio of hot water is increased from 100% water, and the water supply check valve 46 is broken, the hot water storage tank 8 is connected to the hot water storage tank. Since the tap water does not flow into the hot water tank 2, the hot water stored in the hot water storage tank 2 circulates in the hot water discharge pipe 7 and does not flow into the hot water supply mixing valve 27. As a result, the flow rate detected by the hot water supply flow rate sensor 31 decreases.

  In this state, since only hot water flows through the hot water supply pipe 29 and the hot water temperature detected by the hot water temperature sensor 30 remains low, the operation of operating the hot water mixing valve 27 in a direction to open the hot water side one step in (S5). repeat.

  By repeating the operation of opening the hot water mixing valve 27 in the direction of opening to the hot water side by one step, the hot water check valve 46 gradually increases the ratio of hot water from the standby state of 100% water, and each time the hot water flow rate sensor If the flow rate detected by the hot water supply flow rate sensor 31 is less than or equal to the predetermined flow rate in (S9), it is determined that the water supply check valve 46 has failed (S13), and the display unit 41 displays It is displayed that the water supply check valve 46 has failed. (S14)

  As described above, when the hot water supply is started and the flow rate flowing through the hot water supply pipe 29 becomes a predetermined flow rate or less without increasing the hot water supply temperature, it is determined that the water supply check valve 46 has failed and the water supply check is displayed on the display unit 41. Since it is displayed that the valve 46 is out of order, the user knows that hot water does not come out because the water supply check valve 46 is out of order, and can contact the repair shop for prompt repair. .

  In this embodiment, the water supply check valve 46 is provided in the water supply pipe 8, but the present invention is not limited to this, and the water supply pipe 8 and the water supply bypass pipe 28 are not provided with the water supply check valve 46. Even in the structure provided with the check valve, it is possible to determine the failure of the check valve on the side of the hot water pipe 7.

2 Hot water storage tank 3 Heat pump unit (heating means)
7 Hot water supply pipe 8 Water supply pipe 27 Hot water supply mixing valve 29 Hot water supply pipe 30 Hot water supply temperature sensor 31 Hot water supply flow rate sensor 36 Hot water storage temperature sensor 42 Hot water supply control unit 46 Water supply check valve

Claims (2)

  A hot water storage tank having a hot water supply pipe connected to the upper end of the hot water storage pipe connected to the lower end of the hot water stored in the hot water storage tank, a water supply check valve provided in the water supply pipe, and the hot water storage tank A heating means for heating the hot water in the hot water, a hot water mixing valve for mixing the hot water in the upper part of the hot water tank supplied from the hot water pipe and the feed water from the feed water bypass pipe branched from the feed water pipe, and the hot water mixing valve A hot water temperature sensor for detecting the hot water temperature after mixing, a hot water flow rate sensor for detecting the hot water flowing in the tapping pipe, a detection temperature of the hot water temperature sensor and a hot water set temperature set by a remote controller are set. In the hot water storage type hot water supply apparatus including a hot water supply control unit that controls the drive of the hot water mixing valve so as to obtain a hot water supply temperature, the hot water supply control unit is configured so that the hot water supply temperature detected by the hot water supply temperature sensor is detected after the hot water supply is started. Set temperature When the flow rate detected by the hot water flow rate sensor becomes lower than the predetermined flow rate during the operation, the water supply check valve is repeatedly operated. A hot water storage type hot water supply apparatus characterized by displaying that it has failed.   A hot water storage tank having a hot water storage pipe connected to the upper end, a hot water storage tank connected to the lower end, and a hot water storage pipe for discharging hot water stored in the hot water, a hot water pipe check valve provided in the hot water pipe, and the hot water storage A heating means for heating the hot water in the tank to a high temperature; a hot water mixing valve for mixing the hot water in the upper part of the hot water storage tank supplied from the hot water pipe and the feed water from the feed water bypass pipe branched from the feed water pipe; and the feed water bypass A hot water supply temperature sensor for detecting a hot water temperature after mixing of the hot water mixing valve, a hot water flow rate sensor for detecting hot water flowing through the hot water pipe, and a hot water temperature sensor. In the hot water storage type hot water supply apparatus comprising a hot water supply control unit for controlling the drive of the hot water supply mixing valve so as to compare the detected temperature with the hot water supply set temperature set by the remote controller and to supply hot water at the hot water set temperature. Department After the hot water starts, when the hot water temperature detected by the hot water temperature sensor does not reach the hot water set temperature, the hot water mixing valve is squeezed stepwise to open the hot water side and the hot water flow rate sensor is turned on during the operation. A hot water storage type hot water supply apparatus characterized in that when the detected flow rate becomes equal to or lower than a predetermined flow rate, it is determined that the hot water tap check valve has failed.

Images