JP2002022266A - Heat pump type hot water feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat pump type hot water feeding device capable of performing a sufficient additional heating of hot water even in the case that a surrounding air temperature is low in winter season, for example. SOLUTION: A heat pump type hot water feeding device is constituted such that hot water within a hot water storing tank 26 is circulated in a condenser 27 constituting a heat pump 11 to increase its temperature, the hot water is stored in the hot water storing tank 26 to enable the hot water to be fed into at least a bath tub 14. An additional heating heat exchanger 28 constituted such that the hot water within the bath tub 14 is circulated to enable an additional heating to be carried out is arranged within the hot water storing tank 26 and heat of hot water within the hot water storing tank 26 is applied as a heat source for additional heating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump type hot water supply apparatus capable of supplying hot water by heating water by the heat of condensation of a refrigerant.

[0002]

2. Description of the Related Art In a conventional hot water supply apparatus, water is heated by condensing heat of a refrigerant to store hot water in a hot water storage tank, and this hot water can be supplied to a faucet and a bathtub. There has been proposed a heat pump type hot water supply device having a function of keeping the temperature at an appropriate temperature by reheating by the heat of condensation of water.

[0003]

However, in such a heat pump type hot water supply apparatus, there is a problem that when the reheating is performed, for example, when the outside air temperature is low, the reheating is insufficient.

Accordingly, an object of the present invention has been made in view of the above circumstances, and for example, a heat pump type capable of sufficiently reheating even when the outside air temperature is low in winter or the like. A hot water supply device is provided.

[0005]

According to the first aspect of the present invention,
In a heat pump type hot water supply apparatus configured to circulate hot water in a hot water storage tank to a condenser constituting a heat pump and raise the temperature, store the hot water in the hot water storage tank and supply hot water to at least the bathtub, the hot water in the bathtub is circulated. A reheating heat exchanger configured to be capable of reheating is provided in the hot water storage tank, and heat of hot water in the hot water storage tank is used as a heat source for reheating.

According to a second aspect of the present invention, in the first aspect, a heat source for reheating other than the heat of the hot water in the hot water storage tank is provided.

[0007] The invention described in claim 3 is claim 1 or 2.
In the above description, the heat source for reheating other than the heat of the hot water in the hot water storage tank is heat of hot water generated by a heat source device using gas or oil as fuel.

According to a fourth aspect of the present invention, in the third aspect, the heat exchanger for reheating has a double-pipe structure, and hot water in the bathtub is circulated through either the outer pipe or the inner pipe. On the other hand, hot water generated by a heat source device using the gas or the petroleum as a fuel is circulated.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit diagram showing an embodiment of a heat pump type hot water supply apparatus according to the present invention, in which water in a hot water storage tank is heated to store hot water.

As shown in FIG. 1, a heat pump type hot water supply apparatus 10 includes a heat pump unit 11, a hot water supply unit 12, a faucet 13, a bathtub 14, and a control device 15. The control device 15 is a heat pump unit. 11 and the hot water supply unit 12 are controlled.

The heat pump unit 11 includes the compressor 1
6. Accumulator 17 and heat pump heat exchanger 18
Are sequentially arranged in the refrigerant pipe 19 to constitute a part of the refrigerant circuit. The discharge side end of the compressor 16 in the refrigerant pipe 19 is connected to the gas pipe 21 of the inter-unit pipe 20. Further, the end of the refrigerant pipe 19 on the heat pump heat exchanger 18 side is connected to the liquid pipe 22 of the inter-unit pipe 20.

In the refrigerant pipe 19, the discharge side of the compressor 16 and the heat pump heat exchanger 18 side are connected by a bypass pipe 24 provided with an electromagnetic valve 23, and an excessive high pressure of the discharged refrigerant is released. A blower fan 25 is installed near the heat pump heat exchanger 18 to blow air to the heat pump heat exchanger 18.

The hot water supply unit 12 includes a hot water storage tank 2
6, a heat exchanger 27 for hot water supply and a heat exchanger 28 for reheating.

The hot water supply heat exchanger 27 is provided in a refrigerant pipe 29 having a first switching valve 31. The end of the refrigerant pipe 29 on the first switching valve 31 side is connected to the gas side joint 30.
Is connected to the gas pipe 21 of the pipe 20 between the units. Further, the other end of the refrigerant pipe 29 is connected to the liquid pipe 22 of the inter-unit pipe 20 via a liquid side joint 33. Thus, the hot water supply heat exchanger 27 is connected to a part of the refrigerant circuit of the heat pump unit 11, and
, A refrigerant circuit in which the refrigerant circulates is configured.

The hot water supply heat exchanger 27 and the hot water storage tank 26 are connected in a loop by a hot water supply pipe 36 provided with a hot water supply circulating pump 34 and a flow control valve 35, and are indicated by a thick line M in FIG. The hot water supply circulation circuit 52 is configured.

A pressure reducing check valve 37 is provided at the bottom of the hot water storage tank 26.
Is connected, so that tap water can always be supplied into the hot water storage tank 26. That is, the tap water pressure always acts in the hot water storage tank 26. A tapping pipe 40 having a tapping solenoid valve 39 is connected to the top of the hot water storage tank 26.

When the water at the bottom of the hot water storage tank 26 is supplied to the hot water supply heat exchanger 27 by the operation of the hot water supply circulation pump 34, the hot water supply heat exchanger 27 converts the supplied water into a heat pump unit. The refrigerant gas discharged from the eleventh compressor 16 is heated by condensation heat when condensing. The heated water (hot water) is guided to the top of the hot water storage tank 26 via the flow control valve 35, and is stored in the hot water storage tank 26 by, for example, about 60%.
℃ of hot water can be stored. As described above, when the hot water supply heat exchanger 27 functions as a condenser, the heat pump heat exchanger 18 functions as an evaporator.

An electric heater 41 is provided in the hot water storage tank 26. The electric heater 41 raises the temperature of hot water in the hot water storage tank 26 to, for example, about 80 ° C. A drain cock 42 is provided in the hot water supply pipe 36 on the upstream side of the hot water supply circulation pump 34, so that hot water or water in the hot water supply pipe 36 and the hot water storage tank 26 can be drained through the drain pan 43. . Further, a relief means 44 is disposed in the hot water supply pipe 36 on the upstream side of the hot water storage tank 26, and is provided so that the pressure at the time of excessive heating of the water by the hot water supply heat exchanger 27 can be released.

The additional heat exchanger 28 is arranged inside a sealed internal tank 32 provided inside the hot water storage tank 26.

The heat source unit 8 using gas or oil as fuel is connected to the internal tank 32 through a hot water pipe 45.
1 is connected, and the hot water generated by the heat source device 81 circulates in the internal tank 32 as shown by the thick line N in FIG.

The heat exchanger 28 for reheating and the bathtub 1
4 are connected in a loop by a first bathtub piping 51 provided with a bathtub circulation pump 46, a filter 47, a water level sensor 48, a thermistor 49, and a flow switch 50.
A bathtub circulation circuit 53 indicated by a thick line O in FIG. 4 is configured.
A bypass pipe 55 having a bypass solenoid valve 54 is connected to the first bathtub pipe 51 downstream of the bathtub circulation pump 46.

When the hot water is supplied to the bathtub 14 and the hot water is filled in the bathtub 14 as described later, the hot water in the bathtub 14 is operated by the circulation pump 46 for the bathtub. Heat of hot water in 26 and / or heat source unit 81
The hot water in the bathtub 14 is heated by the heat of the hot water from the hot water to perform reheating, thereby keeping the hot water in the bathtub 14 warm.

Since the water level sensor 48 communicates with the bathtub 14 via the first bathtub piping 51, the water level sensor 48 detects the water level of hot water (water) in the bathtub 14. When hot water is circulating in the bathtub circulation circuit 53, the thermistor 49 detects the hot water temperature and indirectly detects the hot water temperature in the bathtub 14. The flow switch 50 detects that hot water is circulating in the bathtub circulation circuit 53. Furthermore,
The filter 47 includes a filter 56 disposed in the bathtub 14.
At the same time, the hot water is filtered.

The faucet 13 has a hot water supply pipe 59 provided with a mixing control valve 57 and a flow sensor 58 as shown in FIG.
The hot water supply pipe 40 is connected to the hot water storage tank 26 as shown by a thick line P in FIG. Furthermore, this faucet 13
It is also connected to a second tap water pipe 60 provided with a pressure reducing check valve 61. The flow sensor 58 detects the amount of hot water flowing in the hot water supply pipe 59.

A first tap water pipe 38 is provided in the hot water storage tank 26.
The tap water pressure is always working via the
By opening the hot water tap 3, hot water in the hot water storage tank 26 is supplied to the faucet 13 via the hot water supply pipe 40 and the hot water supply pipe 59. The hot water from the faucet 13 is mixed with the tap water from the second tap water pipe 60 by opening the tap water faucet of the faucet 13, and can be supplied from the faucet 13.

The mixing control valve 57 includes a tap water solenoid valve 6.
As shown by a thick broken line Q in FIG. 2 through a third tap water pipe 63 provided with a pressure reducing check valve 37 of the first tap water pipe 38.
Connected downstream. Therefore, at the time of the opening operation of the tapping solenoid valve 39 and the tap water solenoid valve 62, the hot water from the hot water storage tank 26 and the tap water pipe 40 and the tap water from the third tap water pipe 63 are controlled by controlling the opening degree of the mixing control valve 57. Is mixed with
The temperature of hot water supplied from the hot water tap of the faucet 13 is, for example, 42 ° C.
It is adjusted to.

As shown in FIG. 3, the downstream side of the flow sensor 58 in the hot water supply pipe 59 and the tub circulation pump 46 and the flow switch 50 in the first bathtub pipe 51 are connected by a second bathtub pipe 68. You. The second bathtub piping 68 has a flow sensor 6 from the hot water supply piping 59 side.
4. Electromagnetic valve for pouring 65, relief means 66, check valve 67
Are sequentially arranged.

Here, the flow sensor 64 detects the amount of hot water flowing in the second bathtub piping 68. The relief means 66 and the check valve 67 release the pressure when the excessively heated hot water flows through the second bathtub piping 68.

When the pouring solenoid valve 65 and the bypass solenoid valve 54 are opened with the bathtub circulation pump 46 stopped, the hot water in the hot water storage tank 26 is discharged as shown by a thick line R in FIG. 40, a part of the hot water supply pipe 59 and the second bathtub pipe 68 to flow into the first bathtub pipe 51. The first bathtub pipe 51 is branched into two branches, one of which is a flow switch 50 and a thermistor. The molten metal is poured into the bath 14 via the water level sensor 49 and the filter 47, and into the bath 14 via the bypass pipe 55. By pouring the hot water into the bathtub 14 from the two directions in the first bathtub piping 51, the hot water can be filled in the bathtub 14 in a short time.

When the water level sensor 48 detects that an appropriate amount of hot water has been poured from the hot water storage tank 26 into the bathtub 14, the pouring solenoid valve 65 and the bypass solenoid valve 54 are closed. Thereafter, when it is detected by the thermistor 49 that the temperature of the hot water in the bathtub 14 has fallen below the appropriate temperature, the bathtub circulation pump 46 operates, and the hot water circulating in the bathtub circulation circuit 53 generates heat for reheating. The steam is reheated by the exchanger 28 to keep the hot water in the bathtub 14 warm.

As described above, the hot water storage tank 26 is
An operation of supplying an appropriate amount of hot water at a suitable temperature and then heating the hot water in the bathtub 14 to a suitable temperature by the additional heat exchanger 28 for a predetermined time to keep the temperature warm is referred to as automatic bathtub operation.

The controller 15 operates and stops (including capacity control) the compressor 16 in the heat pump unit 11, opens and closes the solenoid valve 23, switches the first switching valve 31 in the hot water supply unit 12, and a circulation pump 34 for hot water supply. Or the operation or stop of the bathtub circulation pump 46, the hot water supply solenoid valve 39,
The opening and closing of the bypass solenoid valve 54, the tap water solenoid valve 62 and the pouring solenoid valve 65, the opening degree of the flow control valve 35 and the mixing control valve 57, the energization of the electric heater 41, and the like are controlled, respectively, so that the heat pump unit 11 and The hot water supply unit 12 is controlled.

As shown in FIG. 5, the control device 15 supplies the hot water when the above-described automatic bathtub operation is canceled or when the water level sensor 48 detects that the hot water is drained from the bathtub 14. Solenoid valve 39 and bypass solenoid valve 5
4, the tap water solenoid valve 62 and the pouring solenoid valve 65 are closed.
Is operated to operate the bathtub circulation pump 46 continuously.
As a result, as shown by the thick line S in FIG.
Through the tap water pipe 38, the third tap water pipe 63, a part of the hot water supply pipe 59, and the second bathtub pipe 68, it reaches the bathtub circulation pump 46 of the first bathtub pipe 51, and this bathtub circulation pump 46 The pressurized water is forcibly fed into the reheating heat exchanger 28 and then flows out into the bathtub 14.

As a result, deposits such as dirt attached to the inner wall of the pipe in the reheating heat exchanger 28 are removed by the pressurized water to clean the reheating heat exchanger 28 and to remove the first bathtub piping 51. Cleaning of the inside is also performed.

Therefore, according to the above configuration, the following effects can be obtained.

When the automatic operation of the bathtub is cancelled, or when hot water is drained from the bathtub 14, the reheating heat exchanger 28 and the bathtub 1
4 is connected in a loop to continuously operate a bathtub circulation pump 46 provided in a bathtub circulation circuit 53 to supply pressurized water to the reheating heat exchanger 28 so that the reheating heat exchanger 28 Since the washing is performed, pressurized water is forced to flow into the reheating heat exchanger 28 having a relatively large pressure loss, so that deposits such as dirt adhered to the inner wall of the pipe in the reheating heat exchanger 28. Can be preferably removed, and the heat exchange efficiency of the reheating heat exchanger 28 can be ensured well.

Further, for example, the control device 15 may perform the washing of the reheating heat exchanger 28 every time the bathtub automatic operation is canceled or every time hot water is drained from the bathtub 14.
In this case, the following effects are obtained.

The cleaning of the reheating heat exchanger 28 is performed every time the automatic operation of the bathtub is canceled or every time the hot water is drained from the bathtub 14. Since the deposit can be immediately removed every time the deposit such as dirt adheres, the state in which the deposit adheres to the inner wall of the pipe can be avoided, and the heat exchange efficiency of the reheating heat exchanger 28 can always be ensured.

The controller 15 may operate the bathtub circulation pump 46 intermittently when cleaning the reheating heat exchanger 28. In this case, the following effects are obtained.

Since the bathtub circulation pump 46 is operated intermittently during the cleaning of the reheating heat exchanger 28, the pressure of the pressurized water supplied to the reheating heat exchanger 28 fluctuates. By the shock wave based on the pressure fluctuation, the deposits on the inner wall of the tube of the reheating heat exchanger 28 can be more suitably removed, and even when hot water remains in the bathtub 14, other than the reheating heat exchanger 28. First bathtub piping 5
The remaining hot water in 1 can be pushed out.

In this embodiment, as shown in FIG. 4, a reheating heat exchanger 28 is provided in the hot water storage tank 26, and the heat of the hot water in the hot water storage tank 26 is used as the reheating heat source. As long as the temperature of the hot water in the hot water storage tank 26 is equal to or higher than a certain temperature, the heat can be used to constantly reheat the bath.

Further, a heat source of reheating other than the heat of the hot water in the hot water storage tank 26, that is, the heat of the hot water generated by the heat source unit 81 using gas or oil as fuel (the heat of the hot water in the internal tank 32) is used. It can be used for reheating.

The heat source device 81 is a heat source device for generating hot water for heating. Usually, a separate hot water floor mat, a hot water air conditioner, and the like are connected to the heat source device 81.

Therefore, at the time of heating, the temperature of the hot water from the heat source unit 81 rises instantaneously. For example, even when the outside air temperature is low such as in winter, the hot water temperature becomes considerably high. There is no capacity shortage and sufficient reheating is carried out.

FIG. 6 shows another embodiment.

The reheating heat exchanger 128 is installed in the hot water storage tank 26 and has a double pipe structure.
28A and an inner tube 128B. Then, hot water for additional heating generated by the heat source device 81 circulates in the inner pipe 128B, and hot water in the bathtub 14 circulates in the outer pipe 128A. The inner pipe 128B has a ring shape in plan view, and the hot water flowing into the inner pipe 128B flows in the inner pipe 128B in the circumferential direction of the hot water storage tank 26 and flows out. Outer tube 128
A also has a ring shape in plan view, and the outer tube 128A
The hot water that has flowed in flows into the outer pipe 128A in the circumferential direction of the hot water storage tank 26 and flows out. The present invention is not limited to the above configuration, and it is also possible to circulate hot water in the bathtub 14 in the inner pipe 128B and circulate hot water generated by the heat source unit 81 in the outer pipe 128A.

In the present embodiment, even when the outside air temperature is low, such as in winter, the temperature of the hot water is considerably high, so that sufficient reheating is performed and the reheating heat exchanger 128 is used.
Is simplified.

[0049]

As described above, according to the present invention, the heat exchanger for additional heating is provided in the hot water storage tank, and the heat of the hot water in the hot water storage tank is used as a heat source for additional heating. As long as the temperature is above a certain temperature, reheating can be performed using this heat.

Further, if the heat of reheating other than the heat of the hot water in the hot water storage tank, for example, the heat of the hot water generated by a heat source device using gas or oil as fuel is used for reheating, for example, in winter, etc. Even when the outside air temperature is low, the temperature of the hot water becomes considerably high, so that there is an effect that there is no capacity shortage and sufficient reheating is performed.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing one embodiment of a heat pump type hot water supply apparatus according to the present invention, in which water in a hot water storage tank is heated and hot water is stored.

FIG. 2 is a circuit diagram when hot water is supplied from a faucet.

FIG. 3 is a circuit diagram when hot water is supplied to a bathtub.

FIG. 4 is a circuit diagram when the hot water in the bathtub is reheated to keep the temperature.

FIG. 5 is a circuit diagram when cleaning the reheating heat exchanger.

FIG. 6 is a cross-sectional view showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Heat pump type hot water supply device 11 Heat pump unit 12 Hot water supply unit 14 Bathtub 15 Control device 16 Compressor 18 Heat pump heat exchanger 26 Hot water storage tank 27 Heating heat exchanger 28,128 Heating heat exchanger 46 Bath circulation pump 53 Bathtub Circulation circuit

Continuation of the front page (72) Inventor Yoshinori Toya 1 Otsukicho, Ashikaga, Tochigi Prefecture Sanyo Electric Air Conditioning Co., Ltd. (72) Inventor Kensuke Matsumoto 1 Otsukicho, Ashikaga City, Tochigi Prefecture Sanyo Electric Air Conditioning Co., Ltd. (72 Inventor Kiyoshi Oyama 1 Otsukicho, Ashikaga, Tochigi Prefecture Sanyo Electric Air Conditioning Co., Ltd. (72) Inventor Hideaki Mukada 1 Otsukicho, Ashikaga City, Tochigi Prefecture Sanyo Electric Air Conditioning Co., Ltd. (72) Inventor Yoshihiro Takizawa 1 at Otsuki-cho, Ashikaga, Tochigi Sanyo Electric Air Conditioning Co., Ltd. (72) Inventor Hideyuki Takayama 1 at Otsuki-machi, Ashikaga, Tochigi Prefectural Sanyo Electric Air Conditioning Co., Ltd. (72) Inventor Shigeya Ishigaki No. 1 town Sanyo Electric Air Conditioning Co., Ltd. F term (reference) 3L036 AA05 AA07

Claims (4)

[Claims] 1. A heat pump type hot water supply apparatus comprising: circulating hot water in a hot water storage tank through a condenser constituting a heat pump to raise the temperature; storing the hot water in the hot water storage tank; and supplying hot water to at least a bath tub. A heat pump type hot water supply characterized in that a reheating heat exchanger configured to recirculate hot water in the inside of the hot water storage tank is provided in the hot water storage tank and the heat of the hot water in the hot water storage tank is used as a heat source for reheating. apparatus. 2. The heat pump hot water supply device according to claim 1, further comprising a reheating heat source other than the heat of the hot water in the hot water storage tank. 3. The heat source of reheating other than the heat of the hot water in the hot water storage tank is the heat of hot water generated by a heat source device using gas or oil as fuel. Heat pump water heater. 4. A heat source using the reheating furnace as a double-pipe structure, circulating hot water in the bathtub through one of an outer pipe and an inner pipe, and using the gas or the petroleum as a fuel in the other. 4. The heat pump type hot water supply device according to claim 3, wherein the hot water generated by the machine is circulated.