JPH071114B2 - Heat pump type air conditioner - Google Patents

Description

TECHNICAL FIELD The present invention relates to improvement of comfort during heating operation in a heat pump type air conditioner.

2. Description of the Related Art In recent years, in order to improve the comfort of a heat pump type air conditioner, a method for shortening the defrosting time has been actively developed in order to alleviate a decrease in room temperature during defrosting.

An example of a conventional heat pump type air conditioner will be described below with reference to the drawings. FIG. 2 shows a refrigeration cycle of a conventional heat pump type air conditioner.

In FIG. 2, 1 is a compressor, 2 is a four-way valve, 3 is an outdoor heat exchanger, 4 is a heating throttle, 5 is a check valve, 6 is a first connecting pipe, 7 is a cooling throttle, and 8 is a room. An inner heat exchanger, 9 is a second connecting pipe, and 10 is a heat storage member, which is installed so that heat can be exchanged with a pipe portion 11 between the four-way valve 2 and the second connecting pipe 9.
12 is an accumulator.

The operation of the heat pump type air conditioner configured as described above will be described below.

During the heating operation, the high-temperature high-pressure gas refrigerant discharged from the compressor 1 passes through the four-way valve 2 as shown by a solid arrow and the piping portion 11
When gradually passing through the heat storage member 10, the heat enters the indoor heat exchanger 8 and is condensed, and the cooling throttle 7, the first connecting pipe
6. The pressure is reduced through the heating throttle 4, evaporated in the outdoor heat exchanger 3, again returned to the accumulator 12 through the four-way valve 2, and is sucked into the compressor 1.

Particularly, when the outside temperature is low and the humidity is high, frost begins to adhere to the outdoor heat exchanger 3 during the heating operation and grows. And the outdoor heat exchanger 3
Ventilation resistance increases, heat exchange capacity decreases, and heating capacity decreases accordingly. It is necessary to defrost periodically to prevent this decrease in heating capacity. For defrosting, the pipe temperature of the outdoor heat exchanger 3 is detected, and when the pipe temperature falls below a certain temperature at regular time intervals by a timer, the four-way valve 2 is switched and as shown by the broken line in FIG. It becomes a reverse cycle and defrosting can be performed. At this time, the low-temperature gas refrigerant passing through the pipe portion 11 recovers the amount of heat stored in the heat storage member 10 during the heating operation. Most of the recovered heat is used to melt the frost adhering to the outdoor heat exchanger 3. When the heat storage member 10 was not provided, the amount of heat consumed for defrosting was mostly due to the input of the compressor 1 and the heat released from the indoor heat exchanger 8. Therefore, the defrosting time tended to be long. Here, in order to make the defrosting time shorter, it was necessary to give a heat quantity other than the above-mentioned heat quantity. The heat storage member 10 supplements it.

Problems to be Solved by the Invention However, in the above configuration, since the heat storage member 10 is heated during the heating operation, heat is taken by the heat storage member 10 particularly in the initial heating operation, and the rising characteristics of the blowout temperature are poor. It had a problem that

In view of the above problems, the present invention provides a heat pump type air conditioner having improved blowout temperature characteristics in the initial heating operation.

Means for Solving the Problems In order to solve the above problems, the heat pump type air conditioner of the present invention uses a heat storage member to store the temperature of the high-temperature high-pressure gas refrigerant before entering the indoor heat exchanger in the initial heating operation. In order to prevent it from being lowered, in the early stage of heating operation, the pipe section without the heat storage member is passed through, and when the temperature rises rapidly in the indoor heat exchanger and the temperature rises sufficiently, the refrigerant in the pipe section equipped with the heat storage member It is provided with a structure in which a three-way valve is provided in the piping part for controlling so that the fluid flows.

Action The present invention, when the indoor heat exchanger in the early stage of the heating operation is not sufficiently warmed by the above-described configuration, the three-way valve provided in the piping section causes the refrigerant to flow through the piping section without the heat storage member, and the indoor side. After the heat exchanger has reached a certain temperature or higher, the refrigerant is caused to flow through the pipe portion provided with the heat storage member to store the heat in the heat storage member, so that the rising characteristics of the blowout temperature in the initial heating operation can be improved.

Example A heat pump type air conditioner of an example of the present invention will be described below with reference to the drawings. FIG. 1 shows a refrigeration cycle of a heat pump type air conditioner in an embodiment of the present invention. It should be noted that the same components as those of the related art are designated by the same reference numerals and detailed description thereof will be omitted.

In FIG. 1, 13 is a three-way valve, which is arranged in series with the pipe section 11. Reference numeral 14 is a first pipe in which the heat storage member 10 is arranged in a heat exchange manner, 15 is a second pipe, and 16 is a temperature detection control device, which is attached to a part of the indoor heat exchanger.

The operation of the heat pump type air conditioner configured as described above will be described below with reference to FIG.

When the temperature of the indoor heat exchanger 8 is lower than a predetermined temperature at the beginning of the heating operation after the completion of defrosting, the high-temperature and high-pressure gas refrigerant blown out from the compressor 1 is attached to a part of the indoor heat exchanger 8. By allowing the refrigerant to flow through the second pipe 15 by the three-way valve 13 controlled by the temperature detection control device 16 as shown by the solid arrow line, the high-temperature and high-pressure gas refrigerant is transferred to the indoor heat exchanger 8 with almost no heat loss. Inflow. Therefore, the indoor heat exchanger 8
Rises to a predetermined temperature in a short time. When the temperature reaches a predetermined temperature, the temperature detection control device 16 operates, and the three-way valve 13 is switched so that the refrigerant flows through the first pipe 14 provided with the heat storage member 10, as shown by the broken line of the arrow. The high-temperature and high-pressure gas refrigerant heats the heat storage member 10 to store heat.

Next, when the defrosting operation is started from the heating operation, the four-way valve 2 is switched to be in the reverse cycle. During defrosting, the three-way valve 13 flows through the first pipe 14
By forcibly holding the state in which the low temperature gas refrigerant is in communication with the heat storage member 10, the heat amount stored in the heat storage member 10 can be recovered during defrosting, and most of the recovered heat amount can be spent for melting frost. Therefore, the defrosting time can be shortened.

As described above, according to the present embodiment, the refrigeration system aiming at shortening the defrosting time is provided with the heat storage member, and by providing the three-way valve that can switch the flow path depending on the temperature of the indoor heat exchanger during the heating operation, It is possible to improve the rising characteristics of the outlet temperature in the initial heating operation, and improve the comfort during heating operation without impairing the reduction of defrosting time.

Effect of the Invention As described above, the present invention is a three-way bypassing the piping flow path provided with the heat storage member provided to shorten the defrosting time when the indoor heat exchanger in the initial heating operation is not warm. By providing the valve, it is possible to improve the rising characteristic of the blowout temperature in the early stage of the heating operation and shorten the defrosting time during defrosting.

[Brief description of drawings]

FIG. 1 is a refrigeration system diagram of a heat pump type air conditioner in an embodiment of the present invention, and FIG. 2 is a refrigeration system diagram of a conventional heat pump type air conditioner. 1 ... compressor, 3 ... outdoor heat exchanger, 8 indoor heat exchanger, 10 ... heat storage member, 13 ... three-way valve, 14 ... first piping,
15 …… Second piping, 16 …… Temperature detection control device.

Claims (1)

[Claims] 1. A compressor, a four-way valve, an outdoor heat exchanger, a heating throttle, a check valve arranged in parallel with the heating throttle, a first connecting pipe, a cooling throttle, an indoor heat exchanger, and a first heat exchanger. A refrigeration cycle configured by sequentially connecting two connecting pipes and an accumulator, a three-way valve provided in series between the second connecting pipe and a four-way valve, and heat-exchangedly installed on only one of the three-way valves. Temperature detection control for detecting the temperature in a first pipe having a heat storage member, a second pipe arranged in parallel with the first pipe, and a part of the indoor heat exchanger to control the movement of the valve of the three-way valve Consists of equipment,
A heat pump type air conditioner characterized by performing a heating operation by flowing a refrigerant only in the second pipe section until the temperature of the indoor heat exchanger at the time of starting the heating operation becomes sufficiently high.