JP3736216B2 - Water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water heater using a heat pump and combustion.
[0002]
[Prior art]
Conventionally, this type of water heater is disclosed in JP-A-59-195048. Hereinafter, conventional techniques will be described with reference to the drawings. FIG. 8 is a block diagram of a conventional water heater. In FIG. 8, the water in the lower part of the heat storage tank 6 is returned to the upper part of the heat storage tank 6 via the circulation pump 8 from the heat exchanger 3 ′ that exchanges heat with the condenser 3 of the heat pump 1, through the heat exchanger 14 of the combustion water heater 12. It is. The water in the heat storage tank 6 is heated to an intermediate temperature by the heat pump 1 and then heated to a high temperature of 80 ° C. by the combustion water heater 12.
[0003]
[Problems to be solved by the invention]
However, in the conventional water heater, since the hot water temperature in the heat storage tank is always kept at a high temperature of 80 ° C., the heat dissipation loss is large. Moreover, the heat storage tank volume becomes large from the necessity to ensure the amount of hot water required for hot water in the heat storage tank, and there is a problem in installation space.
[0004]
The present invention solves the above-mentioned problem. The hot water temperature in the heat storage tank is set to an intermediate temperature only for boiling the heat pump, and the shortage is covered with a combustion water heater as necessary, thereby reducing heat dissipation loss and heat storage. The main purpose is to reduce the size of the tank.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention includes a heat pump unit in which a compressor, a condenser, a decompressor, and an evaporator are connected by a refrigerant flow path, and the internal water is heated to an intermediate temperature by the heat of the condenser. A hot water storage tank, a combustion hot water supply unit having a heat exchanger provided in the middle of a water supply pipe between the heat storage tank and the hot water outlet and heated by the heat of the combustion burner, and the combustion hot water supply unit An exhaust passage for introducing the generated combustion exhaust gas into the evaporator, and when the hot water temperature of the heat storage tank is lower than the intermediate temperature, or when hot water having a temperature higher than the intermediate temperature is required, A hot water supply apparatus that performs hot water supply by combustion of a combustion burner.
[0006]
With the above configuration, the water in the heat storage tank is stored and stored at a predetermined temperature set in advance by the heat pump operation. The predetermined temperature is sufficient to ensure the efficiency of the normal heat pump and is an intermediate temperature of 50 to 55 ° C., which is higher than the normal hot water temperature, so that the heat dissipation loss of the heat storage tank is reduced. In addition, by providing a heat exchanger that is heated by the heat of the combustion burner provided in the middle of the tank outlet pipe between the heat storage tank and the hot water outlet, When hot water is required, hot water can be supplied by combustion, and the heat storage tank can be set to the minimum required size, so the heat storage tank can be downsized. Further, the combustion exhaust gas generated from the combustion hot water supply unit is introduced into the evaporator, and the heat pump is operated simultaneously during the hot water supply by combustion, whereby the heat of the combustion exhaust gas can be efficiently recovered.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
In order to solve the above problems, the present invention includes a heat pump unit in which a compressor, a condenser, a decompressor, and an evaporator are connected by a refrigerant flow path, and the internal water is heated to an intermediate temperature by the heat of the condenser. A hot water storage tank, a combustion hot water supply unit having a heat exchanger provided in the middle of a water supply pipe between the heat storage tank and the hot water outlet and heated by the heat of the combustion burner, and the combustion hot water supply unit An exhaust passage for introducing the generated combustion exhaust gas into the evaporator, and when the hot water temperature of the heat storage tank is lower than the intermediate temperature, or when hot water having a temperature higher than the intermediate temperature is required, The hot water heater is configured to perform hot water supply by combustion of a combustion burner, and the water in the heat storage tank is stored and stored at a predetermined temperature set in advance by a heat pump operation. The predetermined temperature is sufficient to ensure the efficiency of the normal heat pump and is an intermediate temperature of 50 to 55 ° C., which is higher than the normal hot water temperature, so that the heat dissipation loss of the heat storage tank is reduced. In addition, by providing a heat exchanger that is heated by the heat of the combustion burner provided in the middle of the tank outlet pipe between the heat storage tank and the hot water outlet, When hot water is required, hot water can be supplied by combustion, so the heat storage tank can be set to the minimum necessary size, and the heat storage tank can be downsized. Further, the combustion exhaust gas generated from the combustion hot water supply unit is introduced into the evaporator, and the heat pump is operated simultaneously during the hot water supply by combustion, whereby the heat of the combustion exhaust gas can be efficiently recovered.
[0008]
In addition, the heat pump unit and the combustion hot water supply unit are positioned at the top of the heat storage tank and housed in a single box. The water piping and control system can be organically arranged, making the unit more compact and space-saving. I can plan. Or the freedom degree of installation improves.
[0009]
In addition, it is equipped with a neutralization treatment device that neutralizes the drain water from the evaporator of the heat pump unit, and neutralizes the highly acidic drain water that is generated when the combustion exhaust gas recovers heat with the evaporator. By doing so, the problem of corrosion of the equipment can be solved.
[0010]
Also, a burner combustion detecting means of the combustion hot water supply unit and a control means for starting the operation of the heat pump unit by a signal of the combustion detection means, detecting the start of the burner combustion, operating the heat pump, and at the time of hot water supply by combustion By simultaneously operating the heat pump, the heat of the combustion exhaust gas can be efficiently recovered. Therefore, the hot water in the heat storage tank is replenished by starting the heat pump operation at the same time as the hot water in the heat storage tank is taken out by the hot water supply.
[0011]
The combustion hot water supply unit has a combustion blower for sending burner combustion air and drive detection means for the combustion blower, and starts operation of the heat pump unit by a signal from the drive detection means for the combustion blower. A control means is provided, and the heat pump is operated in accordance with the operation of the combustion blower driven during burner combustion, and the evaporator blower is driven, so that the combustion air is reliably transferred from the burner section to the heat exchanger and evaporation. Therefore, the combustion can be stabilized and the heat of the combustion exhaust gas can be efficiently recovered.
[0012]
Further, the evaporator has a blower, the combustion hot water supply unit has a combustion blower for sending burner combustion air and drive detection means for the combustion blower, and a signal from the blower drive detection means of the combustion blower With the control means for starting the operation of the blower of the heat pump unit, even when the operation of the heat pump is not required by driving the blower of the heat pump according to the operation of the combustion blower driven at the time of burner combustion Since the combustion air reliably passes through the heat exchanger from the burner portion and becomes combustion exhaust gas by the blower of the evaporator and is discharged to the outside, the combustion can be stabilized.
[0013]
The blower drive detection means detects rotation of the combustion blower and can reliably detect the rotation.
[0014]
Further, the evaporator has a blower, and has a blower drive detection means of a burner combustion blower of the combustion hot water supply unit and a compressor drive detection means of a heat pump, and when it is detected that the combustion blower is driven, compression is performed. If the machine is driven, set the blower of the heat pump unit as a strong wind setting, and if the compressor is not driven, it will be equipped with control means to operate the fan of the heat pump unit as a weak wind setting, and operate the combustion blower driven during burner combustion When the heat pump is in operation, it detects the driving state of the compressor, and during the heat pump operation, the fan is set to the strong wind required for the air flow of the evaporator to ensure the normal operation of the heat pump and the heat pump is operated. If not, set the low wind required to discharge the flue gas to ensure that the flue gas is removed with minimal blower power. It can be discharged to.
[0015]
The compressor drive detection means detects the operating current value of the compressor, and can be reliably detected with a simple electric circuit.
[0016]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. In addition, in a prior art example and each Example, the same code | symbol is attached | subjected about what has the same structure and the same operation | movement, and description is partially abbreviate | omitted.
[0017]
Example 1
FIG. 1 is a configuration diagram of a water heater according to a first embodiment of the present invention.
[0018]
In FIG. 1, a heat pump 1 includes a compressor 2, a condenser 3, a decompressor 4, and an evaporator 5 connected by a refrigerant flow path. Reference numeral 6 denotes a heat storage tank, and water from the lower part of the heat storage tank 6 is guided to the condenser 3 by the circulation pump 8, heated and heated by the heat of the condenser 3, and returned to the heat storage tank 6. A pipe 9 for supplying tap water or the like is provided at the lower part of the heat storage tank 6, and a tank hot water discharge pipe 10 is provided at the upper part. Between the terminal hot water outlet 11 of the tank hot water discharge pipe 10 and the terminal currant 11. A heat exchanger 14 that is heated by the heat of the combustion burner 13 that constitutes the combustion water heater 12 is disposed. 15 is a blower for ventilating the evaporator 5, 16 is an exhaust passage of the blower 15, 17 is a combustion blower for sending combustion air of the burner 13, and 18 is a combustion opened at the air inflow side of the evaporator 5. The heat pump unit 1 and the combustion hot water supply unit 12 are positioned above the heat storage tank 6 in the exhaust passage of the combustion exhaust gas of the hot water supply unit 12 and stored in one box 19.
[0019]
The operation and action of the above configuration will be described. First, when a power source (not shown) is turned on, the operation of the compressor 2, the blower 15, and the circulation pump 8 of the heat pump 1 is started, and water in the heat storage tank 6 is boiled to a predetermined temperature (50 to 55 ° C.). Since the hot water temperature in the heat storage tank 6 is usually 50 to 55 ° C. at the time of hot water discharge, the combustion burner 13 is not ignited, and the hot water temperature in the heat storage tank 6 decreases or when high temperature hot water is required Hot water is supplied by combustion. Therefore, since it is the intermediate temperature of 50-55 degreeC which is more than normal hot-water temperature, the heat dissipation loss of the thermal storage tank 6 is reduced. Moreover, the hot water temperature of the heat storage tank 6 falls by providing the heat exchanger 14 heated with the heat of the combustion burner 12 provided in the middle of the tank hot water pipe 10 between the heat storage tank 6 and the terminal currant 11 which discharges hot water. In such a case, when hot water is needed, hot water can be supplied by combustion. Therefore, the heat storage tank 6 can be set to the minimum necessary size, and the heat storage tank 6 can be downsized. Further, since hot water or water in the heat storage tank 6 is used during combustion hot water supply, the combustion exhaust gas that has passed through the heat exchanger 14 of the combustion hot water heater 12 is evaporated from the exhaust passage 18 by simultaneously operating the heat pump unit 1. Then, the heat of the combustion exhaust gas can be efficiently recovered by the evaporator 5.
[0020]
Furthermore, the heat pump unit 1 and the combustion hot water supply unit 12 are positioned above the heat storage tank 6 and housed in a single box 19 so that water piping and a control system can be organically arranged, and the size of the unit can be reduced. And space saving. Or the freedom degree of installation improves.
[0021]
(Example 2)
FIG. 2 is a configuration diagram of a water heater according to a second embodiment of the present invention. In FIG. 2, 20 is a drain pan that receives drain water from the evaporator 5, 21 is a drain water neutralization apparatus, and 22 is connected to the drain pan 20 by a drain pan drainage channel. 23 is a neutralizer drain.
[0022]
The operation and action of the above configuration will be described.
[0023]
The highly acidic drain water generated when the combustion exhaust gas recovers heat in the evaporator 5 is received by the drain pan 20, enters the neutralization treatment device 21 from the drain pan drainage channel 22, and is neutralized by the neutralization treatment device 21. Then, it is discharged from the neutralizer drain 23 to the outside. Thus, the neutralization treatment device 21 neutralizes the highly acidic drain water generated when the combustion exhaust gas recovers heat in the evaporator 5, thereby eliminating the problem of corrosion of the equipment.
[0024]
Example 3
FIG. 3 is a configuration diagram of a water heater according to a third embodiment of the present invention. In FIG. 3, 24 is a burner combustion detection means, 25 is a control means, and has a combustion detection means 26 and a heat pump operation means 27.
[0025]
The operation and action of the above configuration will be described.
[0026]
When the burner 13 burns, the signal of the burner combustion detection means 24 is detected by the combustion detection means 26, and as a result, the operation of the heat pump unit 1 is started by the heat pump operation means 27. Thus, the heat of the combustion exhaust gas can be efficiently recovered by the evaporator 5 by detecting the start of combustion of the burner 13 during hot water supply by combustion and simultaneously operating the heat pump 1. Therefore, the hot water in the heat storage tank 6 is taken out simultaneously with the hot water supply, and at the same time the heat pump operation is started, the hot water in the heat storage tank 6 is efficiently replenished.
[0027]
(Example 4)
FIG. 4 is a configuration diagram of a water heater according to a fourth embodiment of the present invention. In FIG. 4, reference numeral 28 denotes a combustion blower drive detection means, which detects the number of revolutions of the combustion blower 17 by a hall element or a phototransistor. Reference numeral 29 denotes a control means having a combustion fan drive detecting means 30 and a heat pump operating means 27.
[0028]
The operation and action of the above configuration will be described. When the operation of the combustion blower 17 is started to burn the burner 13, the signal of the combustion blower drive detection means 28 is detected by the combustion blower drive detection means 30, and as a result, the heat pump operation means 27 detects the heat pump unit 1. Start driving. In this manner, the heat of the heat pump is operated in accordance with the operation of the combustion blower 17 driven during the burner combustion, and the blower 15 of the evaporator 5 is driven, so that the combustion air reliably exchanges heat from the burner 13 part. Therefore, the combustion can be stabilized and the heat of the combustion exhaust gas can be efficiently recovered. Further, by using the blower drive detection means 28 as means for detecting the rotation of the combustion blower 17, reliable detection can be performed.
[0029]
(Example 5)
FIG. 5 is a configuration diagram of a water heater according to a fifth embodiment of the present invention. In FIG. 5, 31 is a control means, and has a combustion fan drive detection means 30 and a fan operation means 32.
[0030]
The operation and action of the above configuration will be described. When the operation of the combustion blower 17 is started to burn the burner 13, the signal of the combustion blower drive detection means 28 is detected by the combustion blower drive detection means 30, and as a result, the blower operation means 32 operates the blower 15. To start. In this way, the air blower 15 of the heat pump is driven in accordance with the operation of the combustion blower 17 that is driven at the time of burner combustion, so that the combustion air is reliably supplied to the burner 13 parts even when the heat pump operation is not required. Since the exhaust gas is discharged to the outside by the blower 15 of the evaporator 5 through the heat exchanger 14, the combustion can be stabilized.
[0031]
(Example 6)
FIG. 6 is a configuration diagram of a water heater according to a sixth embodiment of the present invention. In FIG. 6, 33 is a compressor drive detection means, 34 is a control means, and includes a combustion blower drive detection means 30, a compressor drive detection means 35, a compressor drive comparison means 36, a strong wind operation means 37, and a weak wind operation means 38. Have.
[0032]
The operation and action of the above configuration will be described. When the operation of the combustion blower 17 starts to burn the burner 13, the signal of the combustion blower drive detection means 28 is detected by the combustion blower drive detection means 30, and then the compressor drive detection means 35 detects the compressor. The signal of the drive detection means 33 is detected, the compressor drive comparison means 36 determines whether or not the compressor 2 is driven, and if the result is that the compressor 1 is driven, a command is sent to the strong wind operation means 37 and the heat pump When the compressor 1 is not driven, a command is sent to the low wind operating means 38, and the blower 15 of the heat pump 1 is operated with a weak wind. Thus, during the operation of the combustion blower 17 driven during burner combustion, the driving state of the compressor 2 indicating the heat pump operation is detected, and during the heat pump operation, the strong air necessary for the blower 15 to blow the evaporator 5 This setting ensures the normal operation of the heat pump, and when the heat pump is not operating, the low wind setting required to discharge the combustion exhaust gas ensures the combustion exhaust gas with the minimum blower power. Can be discharged to the outside.
[0033]
(Example 7)
FIG. 7 is a configuration diagram of a water heater according to Embodiment 7 of the present invention. In FIG. 7, the difference from FIG. 6 is that the operating current detecting means 39 for detecting the operating current value of the compressor 2 is used as the compressor driving detecting means 33, for example, a current transformer. Therefore, reliable detection can be performed with a simple electric circuit.
[0034]
【The invention's effect】
As is clear from the above description, the water in the heat storage tank is stored and stored at a predetermined temperature in the heat pump operation, and the temperature is an intermediate temperature of, for example, 50 to 55 ° C., which is higher than the normal hot water temperature. The heat dissipation loss of the heat storage tank is reduced. In addition, by providing a heat exchanger that is heated by the heat of the combustion burner provided in the middle of the tank outlet pipe between the heat storage tank and the hot water outlet, When hot water is required, hot water can be supplied by combustion, and the heat storage tank can be set to the minimum required size, so the heat storage tank can be downsized. Further, the combustion exhaust gas generated from the combustion hot water supply unit is introduced into the evaporator, and the heat pump is operated simultaneously during the hot water supply by combustion, whereby the heat of the combustion exhaust gas can be efficiently recovered.
[Brief description of the drawings]
1 is a configuration diagram of a water heater according to a first embodiment of the present invention. FIG. 2 is a configuration diagram of a water heater according to a second embodiment of the present invention. FIG. 3 is a configuration diagram of a water heater according to a third embodiment of the present invention. 4] Configuration diagram of hot water supply of embodiment 4 of the present invention [FIG. 5] Configuration diagram of hot water supply device of embodiment 5 of the present invention [FIG. 6] Configuration diagram of hot water supply apparatus of embodiment 6 of the present invention [FIG. Construction diagram of hot water supply of Example 7 of the present invention [Fig. 8] Configuration diagram of a conventional hot water heater [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Heat pump unit 2 Compressor 3 Condenser 4 Decompressor 5 Evaporator 6 Heat storage tank 10 Tank outlet pipe 11 Terminal curan (outlet opening)
DESCRIPTION OF SYMBOLS 13 Combustion burner 14 Heat exchanger 15 Blower 19 Box 21 Neutralization processing device 24 Burner combustion detection means 25 Control means 26 Combustion detection means 27 Heat pump operation means 28 Combustion blower drive detection means 30 Combustion blower drive detection means 32 Blower operation Means 33 Compressor drive detection means 35 Compressor drive detection means 36 Compressor drive comparison means 37 Strong wind operation means 38 Low wind operation means 39 Operating current detection means

Claims (6)

A heat pump unit in which a compressor, a condenser, a decompressor, and an evaporator are connected by a refrigerant flow path; a heat storage tank in which internal water is heated to an intermediate temperature by heat of the condenser; and the heat storage tank A combustion hot water supply unit having a heat exchanger provided in the middle of a water supply pipe between the hot water outlet and heated by the heat of the combustion burner, and an exhaust for introducing combustion exhaust gas generated from the combustion hot water supply unit to the evaporator When the passage , the burner combustion detection means of the combustion hot water supply unit, and the control means for starting the operation of the heat pump unit by the signal of the combustion detection means, when the hot water temperature of the heat storage tank is lower than the intermediate temperature, Alternatively, when hot water having a temperature higher than the intermediate temperature is required, hot water is supplied by combustion of the combustion burner. A heat pump unit in which a compressor, a condenser, a decompressor, and an evaporator are connected by a refrigerant flow path; a heat storage tank in which internal water is heated to an intermediate temperature by heat of the condenser; and the heat storage tank A heat exchanger provided in the middle of the water supply pipe between the hot water outlet and heated hot water by the heat of the combustion burner, a combustion blower for sending burner combustion air, and a drive detection means for the combustion blower A combustion hot water supply unit, an exhaust passage for introducing combustion exhaust gas generated from the combustion hot water supply unit to the evaporator, and a control means for starting the operation of the heat pump unit by a signal of a drive detection means of the combustion blower, When the hot water temperature of the heat storage tank is lower than the intermediate temperature, or when hot water having a temperature higher than the intermediate temperature is necessary, hot water supply by combustion of the combustion burner Water heater, which comprises carrying out. A heat pump unit in which an evaporator having a compressor, a condenser, a decompressor, and a blower is connected by a refrigerant flow path; a heat storage tank in which internal water is heated to an intermediate temperature by the heat of the condenser; and A heat exchanger provided in the middle of a water supply pipe between a heat storage tank and a hot water outlet and heated hot water is heated by the heat of the combustion burner, a combustion blower for sending burner combustion air, and drive detection of the combustion blower A combustion hot water supply unit having a means, an exhaust passage for introducing combustion exhaust gas generated from the combustion hot water supply unit to the evaporator, and a fan drive detection means of the combustion blower to start operation of the blower of the heat pump unit Control means, and when the hot water temperature of the heat storage tank is lower than the intermediate temperature, or when hot water having a temperature higher than the intermediate temperature is necessary, Water heater and performing hot water supply by the combustion of the burn burner. The hot water heater according to claim 2 or 3, wherein the blower drive detecting means detects rotation of the combustion blower. A heat pump unit in which an evaporator having a compressor, a condenser, a decompressor, and a blower is connected by a refrigerant flow path; a heat storage tank in which internal water is heated to an intermediate temperature by the heat of the condenser; and A combustion hot water supply unit having a heat exchanger provided in the middle of a water supply pipe between the heat storage tank and the hot water outlet and heated with hot water of the combustion burner, and combustion exhaust gas generated from the combustion hot water supply unit to the evaporator When the compressor is driven when it is detected that the exhaust passage to be introduced, the blower drive detection means of the burner combustion blower of the combustion hot water supply unit, the compressor drive detection means of the heat pump, and the combustion blower are driven Control means for operating the blower as a low wind setting if the blower is set to a strong wind setting and the compressor is not driven, and the hot water temperature of the heat storage tank is If lower than during the temperature, or water heater wherein when than the intermediate temperature of the high temperature hot water is required, and performing hot water supply by the combustion of the combustion burner. The hot water heater according to claim 5 , wherein the compressor drive detecting means detects an operating current value of the compressor.

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