JPS6233264A - Method of controlling rise of heat pump type air conditioner - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to start-up reverse control of a heat pump type air conditioner.

BACKGROUND OF THE INVENTION In recent years, heat pump type air conditioners have become increasingly shiftless in order to save energy, and in order to ensure high performance, there has been a shift towards inverter models.

Furthermore, due to the diversification of shapes and restrictions on installation space, indoor and outdoor connection pipes are also becoming longer.

The former leads to an increase in the capacity of the heat exchanger, while the latter leads to an increase in the length of the connecting piping, and as the piping constituting the refrigeration cycle becomes longer, the optimum amount of refrigerant increases accordingly, resulting in a multi-refrigerant state. For this reason, there is an increasing risk that liquid refrigerants will be sucked in when starting up the compressor, and countermeasures include methods of providing extra liquid reservoirs for multiple refrigerants, and methods of removing liquid refrigerants by heat exchange between the low-pressure side and the high-pressure side. A method has been used to evaporate the

The latter method is problematic from the standpoint of space saving, and the latter method also includes many problems.

An example of start-up reverse control of the heat pump air conditioner described above will be described below with reference to the drawings.

FIG. 3 is a refrigeration cycle diagram regarding start-up reverse control of a conventional heat pump type air conditioner.

In FIG. 3, 101 is a compressor, 102 is an outdoor heat exchanger, 103 is a capillary tube, and 104 is an indoor heat exchanger, which constitute a so-called refrigeration cycle for cooling. In this refrigeration cycle, the low pressure side suction pipe 105 is in close proximity to the connecting pipe 106 between the outdoor heat exchanger 102 and the capillary tube 103 at the heat exchange section 107 before being sucked into the compressor 101. .

The operation of the start-up control of the heat pump air conditioner configured as described above will be described below.
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First, the high-pressure, high-temperature refrigerant gas pressurized by the compressor 101 radiates heat in the outdoor heat exchanger 102 and is condensed into a high-temperature refrigerant liquid.Then, the pressure is further reduced in the capillary tube 103 and a low-temperature refrigerant liquid is generated. It is evaporated in the indoor heat exchanger 104 and returns to the compressor 101 as a low-temperature refrigerant gas.

At this time, if the amount of refrigerant is large, it will not be evaporated sufficiently in the indoor heat exchanger 104, and a phenomenon will occur in which a low-temperature refrigerant liquid returns to the compressor 101. Therefore, the amount that cannot be evaporated in the indoor heat exchanger 104 is evaporated in a newly provided heat exchange section 107.

(Japanese Unexamined Patent Publication No. 57-174660) Problems to be Solved by the Invention However, since the above-mentioned configuration is applied only to a cooling cycle, problems occur in a dual-purpose cooling/heating type. In other words, the high-temperature, high-pressure refrigerant liquid is present in the refrigeration cycle, but in the cooling and heating cycles it is located in a different location.
In order to achieve both, a complicated bypass circuit is required, the piping that constitutes the refrigeration cycle becomes complicated, and additional space is required.

In view of the above-mentioned problems, the present invention provides multi-startup control for a heat pump type air conditioner, which can be applied to a dual-use air conditioner and air conditioner, in consideration of space saving, as a means of preventing liquid backflow to the compressor. It is something.

Means for Solving the Problems In order to solve the above problems, the start-up control method for a heat pump type air conditioner according to the present invention provides A refrigeration cycle of a heat pump air conditioner is constructed by connecting external heat exchangers in a ring.
A heating device is provided in the suction pipe on the low pressure side leading to the compressor via the four-way valve.

According to the above-described configuration, the present invention energizes the heating device only for a predetermined period of time after starting the compressor, heats the suction pipe on the low pressure side leading to the compressor via the four-way valve, and makes sure that the liquid refrigerant is sufficiently absorbed. Since it is evaporated, the problem of liquid backflow to the compressor, which mainly occurs during startup, can be solved.

Embodiment Hereinafter, startup control of a heat pump type air conditioner according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a refrigeration cycle for realizing multiple start-up control of a heat pump type air conditioner according to an embodiment of the present invention.

In Figure 1, 1 is a compressor, 2 is a four-way valve, 3 is an indoor heat exchanger, 4 is a capillary tube, 5 is an outdoor heat exchanger, and 6 is a low-pressure side leading to the compressor via a four-way valve. 7 is an electric heater.

The operation of the start-up multiple control of the heat pump type air conditioner configured as described above will be explained below with reference to FIGS. 1 and 2.

FIG. 2 is a circuit diagram for realizing start-up control of the heat pump type air conditioner of the present invention.

When the starting relay r2 involved in starting and stopping the compressor 1 is closed, timers T and T2 on the circuit are energized.

Timer T1 is a delay timer that closes t after a predetermined time τ1, and timer T2 closes t2 at the same time as energization, and waits for a predetermined time τ.
This is a time-limited timer that opens t2 after 2 seconds. These two timers TI and T2 first start 11 after the compressor 1 is started.
After seconds, the heater 7 is energized (τ2-τ1.), and then the energization is stopped. In general, τ1 is set to 3 to 5 seconds to prevent simultaneous activation of the compressor 1 and heater 7, and τ2 is set to 5 to 10 minutes in which the refrigeration cycle is reasonably stable and there is no risk of liquid backflow.

As described above, according to this embodiment, the compressor 1, the four-way valve 2,
The indoor heat exchanger a, the capillary tube 4, and the outdoor heat exchanger 5 are connected in an annular manner, and a heater 7 is attached to the suction pipe 6 on the low pressure side from the four-way valve 2 to the compressor 1, and timers TI and T2 are connected. Depending on the combination of set times, it is possible to supply electricity only for a predetermined time after the compressor is started, regardless of whether it is used for air conditioning or air conditioning, thereby preventing liquid backflow that occurs during start-up.

In addition, by using a heater as the heating device, the configuration is simplified, eliminating the need for unnecessary routing of pipes that make up the refrigeration cycle and unnecessary bypass circuits, which was required in the past, and saving space. It is also advantageous in terms of vibration. Moreover, energy saving can be maintained by minimizing the energization time of the heater 7.

Effects of the Invention As described above, the present invention configures a refrigeration cycle of a heat pump type air conditioner by connecting a compressor, a four-way valve, an indoor heat exchanger, a pressure reducing device, and an outdoor heat exchanger in a ring shape. A heating device is installed in the low-pressure suction pipe leading to the compressor via a four-way valve, and the heating device is energized only for a predetermined period of time after the compressor is started. In addition to preventing liquid stagnation when starting up the compressor, it also simplifies the piping that makes up the refrigeration cycle, saving space, and has a significant effect in reducing piping vibration. It will be done.

[Brief explanation of the drawing]

Fig. 1 shows a refrigeration cycle that realizes start-up control of a heat pump air conditioner according to an embodiment of the present invention, Fig. 2 shows a control circuit diagram of the air conditioner, and Fig. 3 shows a conventional heat pump air conditioner. This is a refrigeration cycle related to startup control of the machine. 1... Compressor, 2... Four-way valve, 3...
... Indoor heat exchanger, 4 ... Pressure reduction device, 5
...Outdoor heat exchanger, 6...Suction pipe,
7... Heating device. Name of agent: Patent attorney Toshio Nakao and 1 other person1-
Compressor 2-=1! ! 7 Valve 3- In-vehicle al thermographic equipment 4-m-10-Yahirali tube 5-Outdoor kiln compound #wings/-m-compressor

Claims (1)

[Claims] A compressor, a four-way valve, an indoor heat exchanger, a pressure reducer, and an outdoor heat exchanger are connected in a ring to form a refrigeration cycle of a heat pump air conditioner, and the low-pressure side connects to the compressor via the four-way valve. A method for controlling the start-up of a heat pump type air conditioner, wherein a heating device is provided in the suction pipe of the heat pump, and the heating device is energized only for a predetermined time after starting the compressor.