JP2008134025A - Heat pump type heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operation for efficiently removing frost attached to evaporators by using the plurality of evaporators in a heat pump type heating device. <P>SOLUTION: In this heat pump type heating device comprising a compressor 2 for compressing a refrigerant, a radiator 3 allowing the refrigerant compressed by the compressor 2 to exchange heat with a non-heating fluid, an expansion valve 4 for reducing a pressure of the refrigerant discharged from the radiator 3, and the first evaporator 5 and the second evaporator 7 for evaporating the refrigerant after pressure reduction by the expansion valve 4, a flow channel is switched so that the first and second evaporators 5, 7 are connected between the expansion valve 4 and the compressor 2 in seasons except for winter, and the first evaporator 5 is connected between the expansion valve 4 and the compressor 2, and the second evaporator 7 is connected between the compressor 2 and the expansion valve 4 in winter, and further the flow channel is switched so that the first evaporator 5 is connected between the compressor 2 and the expansion valve, and the second evaporator 7 is connected between the expansion valve 4 and the compressor 2 in defrosting the first evaporator 5, thus the heating operation can be efficiently performed without affected by a defrosting operation. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a heat pump type heating device that heats a low-temperature fluid by heat exchange with a high-temperature fluid.

By the way, in this kind of heat pump type heating device, a compressor that compresses the refrigerant, a radiator that exchanges heat between water and refrigerant used for hot water storage and heating, an expansion valve that expands the refrigerant from the radiator, and an expansion For the defrosting operation, an evaporator for heat exchange of the refrigerant from the valve with the air, a temperature detecting means for detecting the temperature of the refrigerant that has exited the evaporator and determining the timing of the defrosting operation ON / OFF based on the temperature, and A bypass path for bypassing the refrigerant and an electromagnetic on-off valve that opens and closes the bypass path of the refrigerant by electrical control. When the evaporator is defrosted, the electromagnetic on-off valve is opened to The defrosting operation was performed while obtaining high-temperature hot water by allowing the part to flow into the evaporator via the bypass path. (See Patent Document 1.)
JP 2006-97930 A

However, in this conventional type, the refrigerant used for defrosting is decompressed through an expansion valve through a radiator to exchange heat with a high-temperature refrigerant passing through a bypass path and water used for hot water storage or heating. The mixed low-temperature refrigerant is mixed. For this reason, the refrigerant for defrosting is somewhat lower in temperature than the high-temperature refrigerant immediately after coming out of the compressor, so that the defrosting efficiency is lowered and the defrosting time is increased. It was.

In order to solve the above-mentioned problems, the present invention provides a compressor that compresses a refrigerant, a radiator that exchanges heat between the refrigerant compressed by the compressor and an unheated fluid, and the heat dissipation. In a heat pump type heating apparatus comprising an expansion valve that depressurizes the refrigerant discharged from the evaporator, and a first evaporator and a second evaporator that evaporate the refrigerant depressurized by the expansion valve, the first and second evaporations The evaporator is connected between the expansion valve and the compressor except in winter. In the winter, the first evaporator is between the expansion valve and the compressor, and the second evaporator is between the compressor and the expansion valve. The flow path is switched so as to be connected, and when the first evaporator is defrosted, the first evaporator is connected between the compressor and the expansion valve, and the second evaporator is connected between the expansion valve and the compressor. The flow path is switched as described above.

According to a second aspect of the present invention, the winter connection includes adjusting means for adjusting the amount of refrigerant flowing into the radiator and the amount of refrigerant flowing into the second evaporator.

According to a third aspect of the present invention, there is provided an adjusting means for adjusting the amount of refrigerant flowing into the radiator and the amount of refrigerant flowing into the first evaporator when the first evaporator is defrosted.

  According to the present invention, even if the defrosting operation of one evaporator is performed, the normal heating operation can be performed by the other evaporator. Therefore, the defrosting operation efficiently performs the heating operation without hindering the heating operation. Can be done. Moreover, since the high-temperature and high-pressure refrigerant immediately discharged from the compressor can be supplied to the frosted evaporator as the refrigerant for performing the defrosting operation, the time required for the defrosting can be shortened and the defrosting operation can be performed efficiently. Is.

  In addition, during the winter season, two endothermic evaporators are used for efficient heat absorption and the system efficiency is improved. In the winter season, the first evaporator is connected as before to absorb heat. However, since a high-temperature refrigerant flows into the second evaporator, it can dissipate heat and can assist in the heat absorption of the first evaporator under the situation where the air temperature is lowered in winter.

  Further, as in claim 2, the amount of refrigerant flowing into the radiator and the second evaporator can be adjusted by the adjusting means, whereby a heating operation according to the situation can be obtained, and as in claim 3. Since the amount of refrigerant flowing into the radiator and the first evaporator can be adjusted by the adjusting means, the amount of refrigerant can be adjusted according to the heating and defrosting conditions, which is very convenient to use.

An embodiment of the present invention will be described with reference to the drawings.
Reference numeral 1 denotes a refrigerant circulation circuit constituting a heat pump cycle, which includes a compressor 2 that compresses the refrigerant to a high pressure, a radiator 3 that exchanges heat between the refrigerant and water, and an electronic expansion valve that can adjust the opening. The expansion valve 4 for depressurizing the lowered refrigerant, the first evaporator 5 with a fan for evaporating the low-temperature and low-pressure refrigerant and air by heat exchange, and the branch refrigerant circuit 6 connected in parallel with the fan are provided. Similarly, it is constituted by a second evaporator 7 with a fan.

Reference numerals 8 and 9 denote first and second temperature detecting means for detecting the temperature of the refrigerant that has exited the first evaporator 5 and the second evaporator 7 in order to determine the timing of the defrosting operation ON / OFF based on the temperature.
A hot water circulation circuit 10 heats up water used for hot water supply or floor heating by exchanging heat with a high-temperature refrigerant in the radiator 3, and 11 is a circulation pump for circulating water in the hot water circulation circuit 10.

  A first hot gas bypass path 12 supplies a part of the high-temperature and high-pressure refrigerant discharged from the compressor 2 to the first evaporator 5 without passing through the radiator 3 and returns to the front of the expansion valve 4. A part of the high-temperature and high-pressure refrigerant discharged from the compressor 2 switched to the first hot gas bypass path 12 is supplied to the second evaporator 7 without passing through the radiator 3 and returned to the front side of the expansion valve 4. Further, the first hot gas bypass path 12 is provided with a first control valve 14 that constitutes an adjusting means for adjusting the amount of refrigerant supplied to the radiator 3 and the first evaporator 5, and The second hot gas bypass path 13 is provided with a second adjustment valve 15 that constitutes an adjustment means for adjusting the amount of refrigerant supplied to the radiator 3 and the second evaporator 7.

Further, in the refrigerant circulation circuit 1, the first evaporator 5 side from the branch portion of the branch refrigerant circuit 6 and the front side of the second evaporator 7 of the branch refrigerant circuit 6, the refrigerant circulation circuit 1 and the branch refrigerant circuit 6 are arranged from the junction portion. Electromagnetic opening / closing valves 16, 17, 18, and 19 are provided on the first evaporator 5 side and the second evaporator 7 side, respectively.

Electromagnetic on-off valves 20 and 21 are also provided in the first hot gas bypass path 12 just before the joining part with the refrigerant circulation circuit 1 and in the second hot gas bypass path 13 before the joining part with the refrigerant circulation circuit 1. .

22 is a heat pump control circuit that controls each functional part as appropriate and has a calendar function to control each on-off valve so that the heat pump cycle is changed from a cycle other than winter to a cycle of winter specification in November. In addition, defrosting control is also performed at the detected temperatures of the first and second temperature detecting means 8 and 9.

Next, the operation of this embodiment will be described. First, the operation other than the winter indicated by the solid line in FIG. 1 is performed in a state where the branch refrigerant circuit 6 is connected to the refrigerant circulation circuit 1, and the electromagnetic on-off valves 16, 17, 18, 19 is an open state, and the refrigerant that has been made high temperature and high pressure by the compressor 2 is boiled by exchanging heat with the water circulating in the hot water circulation circuit 10 by the radiator 3, and the low temperature and low pressure refrigerant that has fallen in temperature is the expansion valve 4 After the pressure is reduced, the air flows into the first and second evaporators 5 and 7 where the heat is taken from the air to evaporate and is compressed again by the compressor 2. Since the refrigerant is evaporated by the two evaporators of the first and second evaporators 5 and 7, the heat exchange area is widened and the evaporation is efficiently performed correspondingly.

Next, in the winter season, the electromagnetic on-off valves 17 and 19 of the branch refrigerant circuit 6 are closed by the calendar function of the heat-pump control circuit 22, and the second control valve 15 of the second hot gas bypass path 13 and the electromagnetic The on-off valve 21 is opened, and the high-temperature and high-pressure refrigerant is supplied to the second evaporator 7 through the radiator 3 and the second hot gas bypass path 13. Hot water is obtained, and in the second evaporator 7, warm air is obtained by blowing air from the fan, and the refrigerant exiting the radiator 3 and the refrigerant from the second evaporator 7 are in front of the expansion valve 4. And the pressure is reduced by the expansion valve 4 and then flows into the first evaporator 5 where it takes heat away from the air and evaporates. At this time, hot air from the second evaporator 7 is supplied. That can get enough heat even in winter when the air temperature is low There, moreover in which it is able to slow the defrosting operation of the first evaporator 5.

  Further, in the defrosting operation of the first evaporator 5, the first temperature detecting means 8 detects the temperature below a predetermined temperature and sends a signal to the heat pump control circuit 22, thereby closing the electromagnetic on-off valves 16 and 18, and The control valve 14 and the electromagnetic on-off valve 20 are opened, and high-temperature and high-pressure refrigerant is circulated to the first evaporator 5 via the first hot gas bypass path 12 to defrost, and at this time, the second In the evaporator 7, the second control valve 15 and the electromagnetic on-off valve 21 are closed to close the second hot gas bypass passage 13, and the electromagnetic on-off valves 17 and 19 are opened to pass the refrigerant after passing through the expansion valve 4. Is circulated to the second evaporator 7 of the branch refrigerant circuit 6 so that the second evaporator 7 acts as an original evaporator instead of the first evaporator 5 so far.

Next, during the defrosting operation, in the defrosting operation of the second evaporator 7 in which the second temperature detecting means 9 detects a predetermined temperature or less, the heat on / off valves 17 and 19 are closed by the heat pump control circuit 22 and branched. The refrigerant circuit 6 is closed, the second control valve 15 and the electromagnetic on-off valve 21 are opened, and a high-temperature and high-pressure refrigerant is circulated to the second evaporator 7 via the second hot gas bypass path 13 and the second evaporator 7 is opened. The evaporator 7 is defrosted. At this time, in the first evaporator 5, the first control valve 14 and the electromagnetic opening / closing valve 20 are closed to close the first hot gas bypass path 12 and the electromagnetic opening / closing. The valves 16 and 18 are opened to allow the refrigerant after passing through the expansion valve 4 to flow to the first evaporator 5, and the first evaporator 5 acts as the original evaporator instead of the second evaporator 7 so far. To return to

In this manner, the defrosting operation is performed by switching the two evaporators of the first and second evaporators 5 and 7 to the radiator for defrosting and the original evaporator by switching the path respectively. While defrosting is performed efficiently in a short time and the capacity is reduced, hot water heating by the radiator 3 can be continued, and hot water supply and heating are temporarily stopped especially in winter. It can be avoided and is very convenient to use.

Further, during the winter operation, the amount of the high-temperature and high-pressure refrigerant that is divided and distributed to the second evaporator 7 and the radiator 3 is adjusted, and the opening degree of the second control valve 15 is adjusted by the detected temperature of the first temperature detecting means 8. For example, at the temperature when the frosting of the first evaporator 5 has progressed, the flow rate on the second evaporator 7 side of the second control valve 15 is increased so that it takes time to defrost, The second control valve 15 can be narrowed down so that the radiator 3 side is increased, and the heating amount can be controlled so as not to decrease as much as possible, and a heating operation corresponding to the situation can be obtained.

Further, even when the first evaporator 5 is defrosted, the amount of the high-temperature and high-pressure refrigerant that is divided and circulated to the first evaporator 5 and the radiator 3 is changed according to the detected temperature of the first temperature detecting means 8. If the opening degree of the first evaporator 5 is adjusted and the opening degree of the first control valve 15 is narrowed according to the progress of defrosting of the first evaporator 5, the heating power of the radiator 3 is increased depending on the progress of defrosting. It can be raised to perform efficient heating without waste.

In this embodiment, the radiator 3 is heated so as to obtain hot water for hot water supply. However, the present invention is not limited to this. For example, a heating heat medium may be heated and used for heating. Of course, it may also be used for keeping the bath warm or reheating.

Refrigerant circuit diagram other than winter of heat pump heating device showing one embodiment of the present invention Refrigerant circuit diagram during the same winter and defrosting operation of the second evaporator Refrigerant circuit diagram during defrosting operation of the first evaporator in the same winter

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Refrigerant | circulatory circuit 2 Compressor 3 Radiator 4 Expansion valve 5 1st evaporator 7 2nd evaporator 8 1st temperature detection means 9 2nd temperature detection means 12 1st hot gas bypass path 13 2nd hot gas bypass path

Claims (3)

A compressor that compresses the refrigerant; a radiator that exchanges heat between the refrigerant compressed by the compressor and an unheated fluid; an expansion valve that depressurizes the refrigerant discharged from the radiator; and the refrigerant that is decompressed by the expansion valve In the heat pump type heating apparatus provided with the first evaporator and the second evaporator for evaporating the first and second evaporators, the first and second evaporators are connected between the expansion valve and the compressor except in winter, and in winter Switch the flow path so that the first evaporator is connected between the expansion valve and the compressor, and the second evaporator is connected between the compressor and the expansion valve, and when the first evaporator is defrosted, A heat pump heating apparatus, wherein the flow path is switched so that the first evaporator is connected between the compressor and the expansion valve, and the second evaporator is connected between the expansion valve and the compressor. 2. The heat pump heating apparatus according to claim 1, further comprising adjusting means for adjusting the amount of refrigerant flowing into the radiator and the amount of refrigerant flowing into the second evaporator in the winter connection. 2. The heat pump heating device according to claim 1, further comprising adjusting means for adjusting the amount of refrigerant flowing into the radiator and the amount of refrigerant flowing into the first evaporator during defrosting of the first evaporator. .

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