JPS63116063A - Refrigeration cycle device - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Application Field) The present invention relates to a refrigeration cycle device used in an air conditioner or the like.

(Prior Art) Generally, in an air conditioner, as shown in FIG. Four-way valve 2. Indoor heat exchanger 3. Pressure reducing device such as expansion valve 4. Some devices are equipped with a heat pump type refrigeration cycle in which outdoor heat exchangers 5 and the like are successively connected, and are capable of heating and cooling operations. Note that 6 is an indoor fan and 7 is an outdoor fan.

That is, during heating operation, the refrigerant flows in the direction of the solid arrow shown in the figure by switching the four-way valve 2 to form a heating cycle.
The indoor heat exchanger 3 is operated as a nitrogen compression type, and the outdoor heat exchanger 5 is operated as an evaporator. During cooling operation, the four-way valve 2 is returned to flow the refrigerant in the direction of the dashed arrow in the figure to form a cooling cycle, with the outdoor heat exchanger 5 acting as a condenser and the campus heat exchanger 3 acting as an evaporator.

However, such a heat pump type refrigeration cycle has a drawback that the heating capacity is slow to rise during startup during heating operation.

To deal with this, there are systems that provide a heat storage device in the refrigeration cycle and use the heat stored in the heat storage device to compensate for the lack of heating capacity at the time of startup. - An example is shown in FIG.

As shown in Fig. 4, the refrigerant discharge port of the compressor 1 and the west valve 2
A heat exchanger 8a for absorbing heat of the heat storage device 8 is provided between the heat storage device 8 and the heat storage device 8. The heat storage device 8 includes a heat absorption heat exchanger 8a and a heat radiation heat exchanger 8b (or 8a and 8b may be used in common to switch cycles), and a heat storage material such as paraffin 8C is placed around them. It is filled with heat from the refrigerant from the endothermic heat exchanger 8a, melts the paraffin 8C, and stores heat. In addition, a heat exchanger 8 for heat radiation
The stored heat is released to the refrigerant flowing through b. Thus, for the expansion valve 4, the electromagnetic on-off valve 9. Capillary tube 10. Heat radiation heat exchanger 8b and check valve 1
1, a bypass path 12 is provided.

That is, at the start of the heating operation, the refrigerant flows through the bypass path 12 by opening the on-off valve 9, and the lack of heating capacity is compensated for by heat radiation from the heat storage device 8. Thereafter, when steady operation begins, the on-off valve 9 is closed and a normal heating cycle begins. In this normal heating cycle, the heat of the high-temperature refrigerant discharged from the compressor 1 is taken into the heat storage device 8 from the endothermic heat exchanger 8a, and is stored.

However, in such a system that uses the refrigeration cycle itself as a heat storage source, as the heat storage temperature rises, the pressure on the high pressure side of the refrigeration cycle increases accordingly, causing the compressor 1 to operate under overload. This has an adverse effect on the life of compressed mi. Further, there is also a problem with the pressure resistance of not only the compressor 1 but also the refrigeration cycle equipment. For this reason, there is a drawback that high-temperature heat storage is not possible.

On the other hand, if the heat storage device is provided with an electric heater and the electric heater is used as a heat storage source, high-temperature heat storage is possible. However, the use of electric heaters is unfavorable from an economic point of view, and there is a new problem in that it impairs energy conservation.

(Problems to be solved by the invention) This invention was made in view of the above circumstances.
The purpose of this is to speed up heating capacity by using a heat storage device, without adversely affecting the life of the compressor, without causing problems with pressure resistance, and without impairing energy efficiency. To provide an excellent refrigeration cycle device that enables high-temperature heat storage in a heat storage device without any problems.

[Structure of the invention] (Means for solving the problem) A heat storage means by operating a compressor, a heater provided in the heat storage device, a heat storage means by generating heat from the heater, and a means for detecting the temperature of the heat storage device. and a means for selecting and setting each of the heat storage means according to the detected temperature.

(Function) When the heat storage temperature is not very high, heat is stored by operating the compressor, and when the heat storage temperature is high, heat is stored by the heat generated by the heater.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. However, in the drawings, the same parts as in FIG. 4 are given the same reference numerals, and detailed explanation thereof will be omitted.

As shown in FIG. 1, the heat storage device 8 is provided with an electric heater 21 and a temperature sensor 22. And electric heater 21
is connected to the commercial AC power supply 23 via relay contacts 32a, 32a. On the other hand, 30 is a control unit that performs overall control of the air conditioning system, and is comprised of a microcomputer and its peripheral circuits. Therefore, the control section 30 includes a driving operation section 31. Relay 32. and the above temperature sensor 2
2 is connected.

Next, the operation of the above configuration will be explained with reference to FIG. 2.

The operation unit 31 is used to set the heating operation, set a desired air temperature, and perform an operation start operation. Then, the control unit 30 switches the four-way valve 2, opens the on-off valve 9, and switches the compressor 1. The blank fan 6 and the outdoor fan 7 are activated respectively.

In this way, when the compressor 1 is started, the refrigerant discharged from the compressor 1 is transferred to the heat absorbing heat exchanger 8a of the heat storage device 8, the four-way valve 2° blank heat exchanger 3. Open/close valve9. Capillary tube 10, heat storage device 8
Heat radiation heat exchanger 8b, check valve 11. Air/external heat exchanger 5
．． It circulates through the four-way valve 2. In summary, the heat radiation heat exchanger 8b and the outdoor heat exchanger 5 both act as an evaporator,
Furthermore, the indoor heat exchanger 3 acts as a condenser, and heating operation starts. At this time, the heat stored in the heat storage device 8 becomes heating auxiliary heat, and the rise of the heating capacity is accelerated.

The control unit 30 detects the heat storage temperature using the temperature sensor 22, and closes the on-off valve 9 when the detected temperature becomes below a predetermined value (when the heat storage is used up). Then, the refrigerant discharged from the compressor 1 is transferred to the endothermic heat exchanger 8a, the four-way valve 2. Indoor heat exchanger 3. Expansion valve 4, outdoor heat exchanger 5. It circulates through the four-way valve 2.

That is, while the indoor heat exchanger 3 acts as a condenser, the outdoor heat exchanger 5 acts as an evaporator, and the operation shifts to normal heating operation. At this time, the heat of the high temperature refrigerant flowing through the endothermic heat exchanger 8a is taken into the heat storage device 8 via the endothermic heat exchanger 8a and stored.

As the heating operation progresses, frost gradually begins to adhere to the surface of the outdoor heat exchanger 5. Thus, the control unit 30 periodically detects the temperature of the outdoor heat exchanger 5 using a heat exchanger temperature sensor (not shown), and opens the on-off valve 9 when the detected temperature falls below a predetermined value. At the same time, the outdoor fan 7 is turned off. Then, the heat stored in the heat storage device 8 is used as defrosting heat for the outdoor heat exchanger 5.

By the way, the control unit 30 counts time using an internal timer, and when a preset time comes, the following heat storage operation is performed.

First, the temperature sensor 22 detects the heat storage temperature, and the detected temperature is the melting point of paraffin 8C (45°C to 50°C).
The compressor 1 and the outdoor fan 7 are turned on and the four-way valve 2 is switched until the temperature exceeds 1. In other words, warm τ
forming a cycle and flowing the high temperature refrigerant through the heat absorption exchanger 8a;
Store heat. In this case, by turning off the indoor fan 6, almost all of the heat pumped up by the outdoor heat exchanger 5 can be stored in the heat storage device 8.

When the detected temperature exceeds 50° C., the compression R1 and the outdoor fan 7 are turned off, and the relay 32 is energized.

When the relay 32 is energized, the contacts 32a and 32a are turned on, and the heater 21 is energized. That is, the heater 21 generates heat, which is stored in the heat storage device 8.

When the detected temperature exceeds 55°C, the relay 32 is deenergized,
Turn off the heater 21.

After that, when the detected temperature falls below 50℃, the heater 21 is turned on to keep warm, and the detected temperature further decreases to 40℃.
When the temperature falls below .degree. C., the heater 21 is turned off and the compressor 1 is operated to store heat.

The optimal timing for executing this heat storage operation is before the early morning heating starts based on the so-called "good morning timer," late at night when electricity costs are low, or immediately after the heating operation ends.

In this way, at first, heat is stored by operating the compressor 1, and when the heat storage temperature rises, the storage shifts to heat storage by heat generation from the heater 21, thereby preventing overload operation of the compressor 1. , an adverse effect on the life of the compressor 1 can be avoided. Furthermore, there is no problem with the pressure resistance of the refrigeration cycle-like device. Moreover, in a situation where the heat storage temperature is high, heat generation is shifted to the heater 21, so high temperature heat storage is possible.

Furthermore, since the heat storage due to the operation of the compressor 1 is the main one, and the heat storage due to the heat generated by the heater 21 is auxiliary, energy saving performance is not impaired. Furthermore, the smallest heater 21 is sufficient, and no cost problems arise.

Further, although the regular heat storage operation as described above is often performed late at night, the operation of the compressor 1 and the outdoor fan 7 is reduced by the amount of heat stored due to the heat generated by the heater 21, resulting in less noise. This leads to improved reliability of the product.

In addition, in the above embodiment, the case where the heat storage is performed in the range of 50°C to 55°C due to the heat generated by the heater 21 was explained, but the high temperature heat storage in the range of 60°C to 70°C is also possible due to the heat generated by the heater 21. be. Further, although the heat storage due to the operation of the compressor 1 and the heat storage due to the heat generated by the heater 21 are performed independently, they may be performed simultaneously.

In addition, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without changing the gist.

[Effects of the Invention] As described above, according to the present invention, the temperature of the heat storage means generated by the operation of the compressor, the heater provided in the heat storage device, the heat storage means generated by the heat generated by the heater, and the heat storage device is detected. and a means for selecting and setting each of the heat storage means according to the detected temperature, it is possible to accelerate the rise of heating capacity by employing a heat storage device, and without adversely affecting the life of the compressor. Therefore, it is possible to provide an excellent refrigeration cycle device that enables high-temperature heat storage in a heat storage device without causing problems with pressure resistance or impairing energy saving performance.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a control circuit in an embodiment of the present invention, FIG. 2 is a diagram for explaining the operation of the embodiment,
FIG. 3 and FIG. 4 are diagrams each showing the configuration of a conventional heat pump type refrigeration cycle. 1...Compressor, 3...Indoor heat exchanger, 5...Outdoor heat exchanger, 8...Regenerator, 8a...Heat exchanger for heat absorption, 8b...Heat exchanger for heat radiation Container, 8C...paraffin (
heat storage material), 9...1m on-off valve, 12...bypass path, 21...electric heater, 22...temperature sensor, 30
...υ control section. Applicant's agent Patent attorney Takehiko Suzue 1st plan Lr > Dimensions 0 hehe □ Thief Akira ← (, U)

Claims (1)

[Claims] A refrigeration cycle device in which a refrigeration cycle in which a compressor, a condenser, a pressure reduction device, and an evaporator are successively connected to each other is equipped with a heat storage device, and the heat storage device is used as an auxiliary heat source. The heat accumulator includes a heater provided in the heat accumulator, a heat accumulating means by generating heat from the heater, a means for detecting the temperature of the heat accumulator, and a means for selecting and setting each of the heat accumulating means according to the detected temperature. Features of refrigeration cycle equipment.