JPH0765814B2 - Heat pump type refrigeration cycle device - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a heat pump type refrigeration cycle apparatus including a heat storage device, and more particularly to a heat pump device capable of adjusting and controlling the heat storage capacity of the heat storage device according to an operation mode of the refrigeration cycle. Regarding

[Technical background of the invention and its problems] Generally, this type of heat pump type refrigeration cycle apparatus is
As shown in FIG. 7 (see Japanese Patent Laid-Open No. 49-14526), a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a pressure reducing device 4 are shown.
The indoor heat exchanger 5 and the indoor heat exchanger 5 are sequentially connected by a refrigerant pipe 6 to form a refrigeration cycle 7, which constitutes a closed refrigerant circulation circuit.

A heat accumulator 8 is provided in a part of the refrigeration cycle 7, so that the heat amount stored in the heat accumulator 8 during the defrosting operation is released to remove the frost formed on the outdoor heat exchanger 3. Has become.

Other heat pump type refrigeration cycle devices equipped with a heat accumulator in the refrigeration cycle are disclosed in Japanese Utility Model Publication No. 55-28828 and Japanese Utility Model Publication No.
Various proposals have been made in, for example, JP-A 5-65468 and JP-A 55-65469, and they are widely known.

In these heat pump type refrigeration cycle devices, the capacity of the heat accumulator is wasteful in heat storage in the case of maximum load operation in the operation mode of the refrigeration cycle.

Further, the amount of heat stored in the heat accumulator is always controlled to be constant in accordance with the maximum load regardless of the operation mode of the refrigeration cycle. Therefore, while it takes a long time to store heat in the heat storage device, there is a problem that the heat leak from the heat storage device is large and the operation efficiency of the refrigeration cycle is reduced.

[Object of the Invention] The present invention has been made in consideration of the above-mentioned circumstances, and controls and controls the heat storage capacity according to the operation mode of the refrigeration cycle to suppress unnecessary heat storage to reduce heat leaks, and a refrigeration cycle. It is an object of the present invention to provide a heat pump type refrigeration cycle device with improved operation efficiency.

[Outline of the Invention] A heat pump type refrigeration cycle device according to the present invention constitutes a refrigeration cycle by sequentially connecting a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducing device and an indoor heat exchanger with a refrigerant pipe, In the heat pump type refrigeration cycle apparatus including a heat storage device in this refrigeration cycle, the heat storage device is provided with a temperature sensor, and the detected state of the temperature sensor is changed according to the operation mode of the refrigeration cycle and the heat storage amount of the heat storage device. It is characterized in that it is provided with a control device for adjusting and controlling the engine according to the operation mode, and the amount of heat storage is made variable.

[Embodiment of the Invention] An embodiment of a heat pump type refrigeration cycle apparatus according to the present invention will be described below with reference to the accompanying drawings.

FIG. 2 shows an example in which the heat pump type refrigeration cycle device according to the present invention is applied to an air conditioner for cooling and heating, and reference numeral in the drawing
10 is a heat pump type refrigeration cycle. The refrigeration cycle 10 includes a compressor 11, a four-way valve 12, an outdoor heat exchanger 13, a cooling / heating expansion valve 13 as a pressure reducing device, and an indoor heat exchanger.
A closed refrigerant circulation circuit is formed by sequentially connecting 15 with a refrigerant pipe 16, and the first opening / closing valve V _{1 is} provided on the four-way valve 12 side of the indoor heat exchanger 15.
Is the second and third on-off valves on the side of the expansion valve 4 for heat storage and cooling.
V ₂ and V ₃ are provided in each series.

A heat storage circuit 18 is provided so as to bypass the second on-off valve V ₂ . This heat storage circuit 18 is an indoor heat exchanger.
Branched from the 15 side, a heat radiation expansion valve 19 as a pressure reducing device, a heat accumulator 20, and a check valve 21 are sequentially arranged on the way and are connected between the second and third on-off valves V ₂ and V _3. .

Further, a first bypass circuit 23 is provided so as to bypass the first opening / closing valve V _{1, the} indoor heat exchanger 15 and the like. The bypass circuit 23 is branched from between the four-way valve 12 and the first on-off valve V ₁ , is connected to the expansion valve 19 downstream side of the heat storage circuit 18, and is provided with a _fourth on-off valve V ₄ on the way.

On the other hand, between the first on-off valve V ₁ and the indoor heat exchanger 15
The bypass circuit 24 is branched, and this bypass circuit
24 is provided on the way with the on-off valve V 5 of FIG. ₅ and is connected between the third on-off valve V ₃ and the expansion valve 14 for heat storage for cooling and heating, and the refrigeration cycle 10
Constitutes the heating and heat storage circuit.

Further, a heat radiation circuit 25 is branched from between the third on-off valve V ₃ and the expansion valve 14 for heat storage of cooling and heating, and this heat radiation circuit 25 is connected to the suction side of the compressor 11 on the downstream side of the check valve 26. It The heat radiation circuit 25 is provided with a _sixth opening / closing valve V ₆ .

The first to sixth on-off valve V ₁ ~V ₆ and expansion valve 14, 19 is open and the valve opening degree as shown in FIG. 3 in accordance with the operation mode of the refrigeration cycle 10 is controlled by the control unit 28. The control device 28 can also control the operating state of the compressor 11, and the operating frequency of the compressor 11 is adjusted and controlled.

By the way, as shown in FIG. 1, the heat storage device 20 provided in the heat storage circuit 18 has a sealed heat storage tank 30 filled with a heat storage material 31, such as paraffin or brine, and heat exchange with the heat storage material 31. An intervening heat exchanger 32 is housed. Heat exchanger
The heat exchange tube 33 of 32 is arranged over the entire heat storage material 31, and the refrigerant circulating in the refrigeration cycle 10 flows inside the heat storage material 31. The heat storage material 31 exchanges heat with the circulating refrigerant and undergoes a phase change. , For example, to change from a solid phase to a liquid phase.

Further, in the heat storage tank 30, a plurality of temperature sensors 35, 36 having different mounting positions are provided.
At 36, the high temperature refrigerant detects the temperature characteristic of heating the heat storage material 31,
It is adapted to control the operation of the controller 28.

Therefore, the heat storage state in the heat storage unit 20 is detected by the detection states of the temperature sensors 35 and 36, that is, by switching and using the temperature sensors 35 and 36. For example, the fact that heat is stored up to the position of the temperature sensor 35 can be known by the temperature detection by the temperature sensor 35, and whether or not the entire heat is stored can be detected by another temperature sensor 36. Therefore, the heat storage amount can be known by switching the temperature sensors 35 and 36.

Next, the operation of the heat pump type refrigeration cycle device will be described.

The heating / cooling operation, heat storage operation, heat radiation operation (heating start-up operation), heat storage operation, heating defrosting operation, and normal defrosting operation of the heat pump type refrigeration cycle 10 are performed by the control device for the first to sixth operations.
The on-off valves V _{1 to} V ₆ are opened and closed, and the expansion valves 14 and 19 are adjusted and controlled.

At that time, the amount of heat stored in the heat storage device 20 is determined by the temperature sensor.
Since each of the small amount of heat stored by the 35 and the large amount of heat stored by the temperature sensor 36 can be detected, the amount of stored heat can be adjusted and controlled according to the operation mode of the refrigeration cycle 10. For example, a large heat storage amount (for example, 4000 Kcal to 5000 Kcal) is required in the heating start-up operation, and a small heat storage amount (for example, 100 Kcal to 200 Kcal) is required in the defrosting operation. From this, the heat storage amount of the heat storage device 20 is adjusted and controlled by switching and using the temperature sensors 35 and 36 depending on whether the operation mode of the refrigeration cycle is the heating start-up operation (heat dissipation operation) or the defrosting operation. Therefore, it is possible to prevent heat leakage due to unnecessary heat storage.

During the heating start-up operation, the control device 28 is controlled in advance so that the detection state of the temperature sensor is detected by the temperature sensor 36, and a large amount of heat is stored in the heat storage device 20. Specifically, the operation of the control device 28 is controlled by operating an operation switch (not shown), the refrigeration cycle 10 enters a heat storage operation, and heat is sequentially stored in the heat storage material 31 of the heat storage device 20. This heat storage operation is ended when, for example, the temperature sensor 36 in FIG. At this time, the operation of the compressor 11 is variablely controlled so that heat is efficiently stored in the heat storage unit 20. Note that the heat storage amount may be adjusted depending on the operating time of the compressor 11 instead of controlling the compressor 11 so that the capacity is variable.

Further, since the outdoor heat exchanger 13 is frosted due to the connection of the heating operation and the heat exchange function is impaired, defrosting is regularly performed. The selection of the heating defrosting operation or the normal defrosting operation during the defrosting operation is performed according to the detected room temperature. For example, the heating defrosting operation is performed when the room temperature is below the set temperature, and the normal defrosting operation is performed when the room temperature reaches the set temperature.

The heat storage amount required for these defrosting operations is obtained by the heating heat storage operation. In this heating heat storage operation, each on-off valve V _{1 to} V ₆ is automatically switched by the control device 28 during the heating operation, and the detection state of the temperature sensor is detected by the temperature sensor 35,
This is done by storing a small amount of heat in the heat storage device 20.

If only heat is stored for defrosting, the temperature sensor 35
When the temperature reaches or exceeds the set temperature, the heating heat storage operation is ended.

Further, switching control is performed by the control device 28 so that the normal heating heat storage operation or the heat storage operation is automatically performed every time the defrosting operation is performed.

Furthermore, even when heat is released, such as in the heating start-up operation and defrosting operation, the temperature sensors 35 and 36 detect the accumulated heat temperature, and the control device 28 performs valve control of each of the on-off valves V _{1 to} V ₆ to release heat. The completion timing is controlled efficiently.

Next, a first modified example of the heat storage device will be described with reference to FIGS. 4 and 5.

The heat storage unit 20A shown in this modification is one in which the heat storage material 31 is filled in the heat storage case 30 and the heat exchanger 32 is housed.
This point is similar to the heat storage unit 20 shown in FIG. 1, except that the temperature sensor 40 is provided only on the downstream side of the heat exchanger 32.

The temperature characteristic detected by the temperature sensor 40 is expressed as shown in FIG. 5, and in the initial stage of the heat storage operation, the temperature characteristic of the heat exchanger 32 is expressed as indicated by the dotted line A ₁ extending from the inlet side to the outlet side. The temperature characteristic of the heat storage material 31 that is heated by the heat exchanger 32 is represented by the dotted line B ₁ .

On the other hand, when the heat storage operation is continued and the whole heat is stored, the supercooling section near the temperature sensor disappears, the detected temperature rises, and at the stage where the whole heat is stored, the heat exchanger 32 and the heat storage material
The temperature characteristics of 31 are represented by solid lines A ₂ and B ₂ . Therefore, even if the temperature sensor 40 is provided only on the downstream side in the heat storage device 20A, the heat storage device is detected by the value detected by the temperature sensor 40.
You can know the heat storage amount of 20A accurately, this temperature sensor 4
By changing the detection state of 0, that is, the preset set value, it is possible to secure the necessary heat storage amount corresponding to each operation mode.

FIG. 6 shows a second modified example of the heat storage device 20. The heat storage device 20B is divided into a plurality of heat storage chambers, for example, two heat storage chambers in the heat storage case 30B, and the heat storage materials 41a and 4a are provided in the respective heat storage chambers.
1b is filled and the heat exchangers 42a and 42b are housed respectively. Temperature sensors 43 and 44 are provided near the downstream sides of the heat exchangers 42a and 42b, respectively, while the heat exchangers 42a and 4 are provided.
The selective use of 2b is performed by switching the switching valve 45 by the control device 28.

In the embodiment of the present invention, the cooling / heating refrigeration cycle has been described, but the invention can also be applied to a cooling / heating / hot water supply refrigeration cycle, and further to a refrigeration cycle only for heating or hot water supply.

[Advantages of the Invention] As described above, in the present invention, the heat storage device is provided with the temperature sensor, the detection state of the temperature sensor is changed according to the operation mode of the refrigeration cycle, and the heat storage amount of the heat storage device is changed to the operation mode. Since the control device for adjusting and controlling according to the above is provided, the heat storage amount can be set to an optimum value suitable for each operation mode, and waste of heat storage can be eliminated.

Therefore, the heat storage time in the heat accumulator can be efficiently performed with the necessary minimum, and unnecessary heat storage is prevented, so reliability is improved and heat leakage can be reduced, so that the efficiency of the refrigeration cycle can be improved. Can be planned.

In addition, the heating capacity can be increased accordingly.

[Brief description of drawings]

FIG. 1 is a diagram showing a heat accumulator incorporated in a heat pump type refrigeration cycle device according to the present invention, FIG. 2 is a refrigeration cycle diagram showing an embodiment of a heat pump type refrigeration cycle device according to the present invention, and FIG. The figure which shows each operation mode of a heat pump type refrigerating cycle device, FIG. 4 is a figure which shows the 1st modification of a heat storage device, FIG. 5 is a figure which shows the heat storage characteristic of a heat storage device, FIG. 6 is 2nd of a heat storage device. FIG. 7 is a view showing a modified example, and FIG. 7 is a view showing a conventional heat pump type refrigeration cycle device. 10 ... Heat pump type refrigeration cycle, 11 ... Compressor, 12 ... Four-way valve, 13 ... Outdoor heat exchanger, 14 ... Cooling / heating storage expansion valve (pressure reducing device), 15 ... Indoor heat exchanger, 20, 20A, 20B … Heat storage device, 28… Control device, 35, 36, 40, 43, 44… Temperature sensor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Suzuki 336 Tatehara, Fuji City, Shizuoka Prefecture Toshiba Corporation Fuji Factory (56) References Japanese Patent Publication No. 48-17319 (JP, B1)

Claims (4)

[Claims] 1. A heat pump type in which a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducing device and an indoor heat exchanger are sequentially connected by a refrigerant pipe to form a refrigeration cycle, and the refrigeration cycle includes a heat storage device. In the refrigeration cycle device, a temperature sensor is provided in the heat accumulator, and a control device that changes the detection state of the temperature sensor according to the operation mode of the refrigeration cycle and adjusts and controls the heat storage amount of the heat accumulator according to the operation mode. And a heat pump type refrigeration cycle device characterized in that the heat storage amount is variable. 2. The temperature sensor according to claim 1, wherein a plurality of the temperature sensors are provided at different mounting positions in the heat accumulator, and the detection state of the temperature sensor is changed by switching between the temperature sensors. Heat pump type refrigeration cycle device. 3. The temperature sensor according to claim 1, wherein the temperature sensor is provided on the downstream side of the heat exchanger in the regenerator, and the change in the detection state of the temperature sensor changes the set value. Heat pump type refrigeration cycle device. 4. The heat storage amount of the heat storage device is adjusted and controlled according to the operation mode of the refrigeration cycle by controlling the heat storage time or the operation capacity of the compressor by the control device while detecting the heat storage temperature by the temperature sensor. The heat pump type refrigeration cycle apparatus according to item 1 above.