JPH05106943A - Heat pump - Google Patents

Abstract

PURPOSE:To prevent the adhesion of frost to an evaporator surely even when the outside air temperature is low by a method wherein a bypass circuit, connecting the discharging side of a compressor to the inlet side of a choking mechanism, is provided and an opening/ closing valve and a heat-accumulation type heat-exchanger, arranged at the inflow side of the outside air for the evaporator, are interposed in the bypass circuit. CONSTITUTION:A bypass circuit 5, connecting the discharging side of a compressor 1 to the inlet side of a choking mechanism 3, is provided so as to detour a condenser 2 while an opening and closing valve 6 and a heat-accumulation type heat-exchanger 7 are interposed in the same circuit 5. The heat accumulation heat exchanger 7 is arranged on the upstream side of an outside-air flow passage 8 for an evaporator 4. When the outside air temperature is low in winter or the like, the opening/closing valve 5 is opened. Then, high-temperature, high-pressure gas refrigerant, discharged out of the compressor 1, is introduced into the heat-accumulating heat-exchanger 7 through the opening and closing valve 6 to condense and liquefy type accumulating body, filled into the heat-accumulation type heat--exchanger 7, by heating it. The adiabatic expansion of the liquefied refrigerant is effected by the next choking mechanism 3 and the refrigerant is returned into the compressor 1 after evaporating it by the evaporator 4 whereby the adhesion of frost to the evaporator 4 can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air heat source type heat pump.

[0002]

2. Description of the Related Art A refrigerant circuit of a conventional heat pump of this type is shown in FIG. The high-temperature, high-pressure gas refrigerant discharged from the compressor 1 is condensed and liquefied by radiating heat to indoor air in the condenser 2 to become a high-pressure liquid refrigerant. This liquid refrigerant is adiabatically expanded by being throttled by the throttling mechanism 3 to become a low-temperature low-pressure gas-liquid two-phase. The gas-liquid two-phase refrigerant absorbs heat from the outside air into the evaporator 4 to be evaporated and vaporized into a low-temperature low-pressure gas refrigerant, which is sucked into the compressor 1 and compressed again.

[0003]

In the above conventional heat pump, when the temperature of the outside air supplied to the evaporator 4 is low, the moisture in the outside air adheres to the heat transfer surface of the evaporator 4 as frost. However, there is a problem that the heat transfer performance of the evaporator 4 is deteriorated.

[0004]

The present invention has been invented to solve the above-mentioned problems, and the gist thereof is to connect a compressor, a condenser, a throttle mechanism and an evaporator in this order. In this heat pump, a bypass circuit that connects the discharge side of the compressor and the inlet side of the throttle mechanism is provided, and an opening / closing valve and a heat storage heat exchanger are installed in this bypass circuit and the heat storage heat exchanger is evaporated by the evaporation circuit. The heat pump is characterized in that it is arranged on the upstream side in the flow path of the outside air supplied to the vessel.

[0005]

In the present invention, because of the above configuration, when the outside air temperature is low, the open / close valve is opened to store the high temperature / high pressure gas refrigerant discharged from the compressor in the bypass circuit. Heat is stored in the heat storage heat exchanger by passing through the heat exchanger. After the end of heat storage, the on-off valve is closed and the refrigerant discharged from the compressor is circulated to the compressor through the condenser, the throttle mechanism and the evaporator in this order, and at the same time the temperature is increased by passing through the heat storage heat exchanger Allow outside air to flow into the evaporator.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENT One embodiment of the present invention is shown in FIG. As shown in FIG. 1, a bypass circuit 5 that connects the discharge side of the compressor 1 and the inlet side of the throttle mechanism 3 is provided, and an opening / closing valve 6 and a heat storage heat exchanger 7 are interposed in this bypass circuit 5. There is. The heat storage heat exchanger 6 is arranged on the upstream side of the flow path 8 of the outside air supplied to the evaporator 4. Other configurations are similar to those of the conventional one shown in FIG. 2, and corresponding members are designated by the same reference numerals.

In winter, when the temperature of the outside air supplied to the evaporator 4 is low, such as in cold regions, the on-off valve 5 is opened. Then,
The high-temperature, high-pressure gas refrigerant discharged from the compressor 1 enters the heat storage heat exchanger 7 through the on-off valve 6, and heats the heat storage body filled in the heat storage heat exchanger 7 to be condensed and liquefied. Thereafter, the expansion mechanism 3 adiabatically expands the evaporator 4
Then, it vaporizes and returns to the compressor 1. When the heat storage in the heat storage body is completed, the on-off valve 6 is closed. Then, the refrigerant discharged from the compressor 1 circulates to the compressor 1 through the condenser 2, the throttle mechanism 3, and the evaporator 4 in this order, and at the same time, the outside air flows through the heat storage heat exchanger 7 to store heat. After absorbing heat from the body and raising the temperature, it flows into the evaporator 4.

However, even when the temperature of the outside air is low, the outside air is heated by the heat storage heat exchanger 7 to be heated and then supplied to the evaporator 4, so that the frost on the evaporator 4 is frosted. Are prevented or suppressed.

[0009]

According to the present invention, a bypass circuit connecting the discharge side of the compressor and the inlet side of the throttle mechanism is provided, and an opening / closing valve and a heat storage heat exchanger are provided in the bypass circuit and the heat storage heat exchanger is installed. Since it is disposed on the upstream side in the flow path of the outside air supplied to the evaporator, even when the temperature of the outside air is low, this outside air flows through the heat storage heat exchanger and is heated to the evaporator. Since it is supplied, frost formation on the evaporator can be prevented or suppressed. As a result, it is possible to prevent the performance of the evaporator from deteriorating and continue the operation of the heat pump.

[Brief description of drawings]

FIG. 1 is a refrigerant circuit diagram showing an embodiment of the present invention.

FIG. 2 is a refrigerant circuit diagram of a conventional heat pump.

[Explanation of symbols]

 1 Compressor 2 Condenser 3 Throttle mechanism 4 Evaporator 5 Bypass circuit 6 Open / close valve 7 Heat storage heat exchanger

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoichi Mihara 3-chome, Asahi-cho, Nishibiwajima-cho, Nishikasugai-gun, Aichi Prefecture Mitsubishi Heavy Industries, Ltd. Air Conditioning Factory

Claims (1)

[Claims] 1. A heat pump in which a compressor, a condenser, a throttle mechanism and an evaporator are connected in this order, and a bypass circuit connecting the discharge side of the compressor and the inlet side of the throttle mechanism is provided. A heat pump characterized in that an on-off valve and a heat storage heat exchanger are interposed in the heat storage heat exchanger, and the heat storage heat exchanger is arranged on the upstream side in the flow path of the outside air supplied to the evaporator.