JPS6139586B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner, and particularly to an air conditioner using air cooling.

It is generally known that when an air-cooled air conditioner is operated for cooling during the intermediate or winter months, a drop in condensing pressure poses a danger to the refrigeration cycle.

Conventionally, as a method for keeping the condensing pressure within a certain range, it is common to keep the condensing pressure within an allowable range while operating a compressor, such as an outdoor fan airflow control method or a hot gas condenser bypass method.

However, this type of device has drawbacks such as extremely high running costs.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and provide an air conditioner with high device safety and extremely low running cost.

The present invention enables the compressor to stop operating when the outside temperature drops and becomes below the required temperature, and to replace the pump installed in the refrigeration cycle or the piping with the second heat exchanger in a separate system from the refrigeration cycle. The refrigerant is circulated by a pump provided.

The present invention will be explained below based on an embodiment of the split type shown in FIG.

In the figure, 1 is a compressor, and this compressor 1 is provided with an outlet pipe 2 and an inlet pipe 3, and the outlet pipe 2 includes a condenser 4 and an expansion valve 5 constituting a pressure reducing device. The evaporator 6 and the evaporator 6 are connected in series, and the tip thereof is connected to the inlet pipe 3 to form a refrigeration cycle.

The outlet pipe 2 that connects the condenser 4 and the evaporator 6 is provided with a branch pipe 7 that is parallel to the outlet pipe 2.
This branch pipe 7 is provided with a check valve 8 that prevents refrigerant from flowing from the condenser 4 to the evaporator 6 .

Further, the outlet pipe 2 and the inlet pipe 3 that connect the compressor 1 and the condenser 4 are connected by a short-circuit pipe 9 that communicates them, and this short-circuit pipe 9 includes a solenoid valve 10 and a circulation pump 11 are provided, respectively.

In the above configuration, during normal operation, the compressor 1 is first operated, and the refrigerant is transferred to the condenser 4 and the expansion valve 5.
It is then returned to the compressor 1 via the evaporator 6 for circulation operation.

At this time, the solenoid valve 10 is closed to prevent the refrigerant from flowing into the outlet pipe 2 via the short-circuit pipe 9.

When the outside temperature falls below the required temperature, first the compressor 1 is stopped, the solenoid valve 10 which is normally closed is opened, and the circulation pump 11 is activated. Then, the refrigerant is circulated in a direction opposite to the refrigerant flow direction in normal operation shown by the solid line.

That is, the refrigerant condensed in the condenser 4 because the outside temperature is sufficiently low is sucked into the circulation pump 11 as a liquid, sent in the direction of the chain arrow shown in the figure, and evaporated in the evaporator 6. This refrigerant is then sent to the condenser 4 again via the check valve 8.

Note that the operation stoppage of the compressor 1 and the circulation pump 11 and the opening and closing of the solenoid valve 10 may be automated by interlocking with a temperature detector (not shown) that senses the outside temperature.

2 and 3 each show an example of a remote condenser type having different aspects. In FIG.
In addition, FIG. 3 shows a configuration in which a check valve 13 is provided on the outlet side of the circulation pump 11.

With this configuration, it can also be adapted to a remote capacitor type.

FIG. 4 shows another embodiment of the present invention, which differs from the previous embodiment in that piping is provided in a system separate from the refrigeration cycle, and a second heat exchanger and a circulation pump are respectively provided in this piping to cool the refrigerant. It is designed to circulate.

That is, the part indicated by a solid line in FIG. 4, excluding the circulation pump 11, is a conventional air-cooled exclusive air conditioner consisting of an indoor unit A in the left half of the figure and an outdoor unit B in the right half of the figure. Then, an indoor second heat exchanger 14 is installed in the ventilation path of indoor unit A (for example, a space where a conventional heater is installed), and an outdoor second heat exchanger 15 is installed in the ventilation path of outdoor unit B. Two heat exchangers 14 and 15 are connected to each other in an endless manner through a pipe 16 via a circulation pump 11 provided in an indoor unit A, and a refrigerant is sealed inside the connected interior.

In the figure, 17 is an indoor fan, and 18 is an outdoor fan.

In the above configuration, during normal operation, the compressor 1,
Refrigerant is circulated between the condenser 4, the expansion valve 5, and the condenser 6.

When the outdoor temperature falls below the required value, the operation of the compressor 1 is stopped, the circulation pump 11 is activated, and the refrigerant is transferred to the second heat exchanger 14,
Cycle for 15 minutes.

In the above embodiment, a bypass valve or the like may be installed in the indoor heat exchanger to sense the indoor temperature and control the amount of heat absorbed.Also, it is possible to detect the indoor and outdoor temperatures and turn the circulation pump on and off. The indoor temperature may be controlled by

With this configuration, check valves, solenoid valves, compressor shutoff valves, etc. that are required in the other embodiments described above are not required, and the circulation fan is installed in a separate system of piping from the refrigeration cycle. Because it is
It can be easily installed into existing air conditioning equipment.

The present invention has been described above based on preferred embodiments. According to the present invention, the running cost is extremely low compared to conventional devices, and the danger of operating the refrigeration cycle when the outdoor temperature drops can be effectively prevented. I can do it.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing one embodiment of the split type of the present invention, Figs. 2 and 3 are schematic diagrams showing examples of the same remote type, and Fig. 4 is a schematic diagram showing another embodiment of the present invention. FIG. DESCRIPTION OF SYMBOLS 1... Compressor, 4... Condenser, 5... Expansion valve, 6... Evaporator, 11... Circulation pump, 14... Indoor second heat exchanger, 15... Outdoor second heat exchanger.

Claims (1)

[Claims] 1. In an air conditioner formed by sequentially connecting a compressor, a condenser, a pressure reducing device, an evaporator, etc. with piping to form a refrigeration cycle, a short-circuit pipe is provided to communicate the condenser inlet side and the evaporation outlet side. , a valve is provided in the conduit of this short-circuit pipe, which is normally closed and opened when the outside temperature is below a predetermined temperature, to open and close the conduit,
A branch pipe is provided between the condenser and the evaporator that bypasses the pressure reducing device and allows communication in only one direction from the evaporator side to the condenser side, so that the refrigerant can flow to the condenser, the short-circuit pipe,
A circulation path is configured in which the evaporator and branch pipes are circulated in that order, and a circulation pump is installed to operate when the outside temperature falls below a predetermined temperature and the compressor stops to circulate the refrigerant along the circulation path. Characteristic air conditioner.