JPS634104B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a separate air conditioner in which a plurality of indoor units are connected to one outdoor unit. The purpose is to average the heating capacity during heating operation when there is a height difference in the installation location.

Conventionally, in multi-type separate air conditioners with one-to-two piping connections, if there is a height difference between the installation locations of two indoor units, during heating operation, circulation is sent to the indoor unit installed in the lower position. The refrigerant flow rate decreases due to the head difference with the indoor unit installed at a higher position, resulting in a reduction in heating capacity. This tendency becomes more pronounced when the outdoor unit is installed at a higher position than the lower indoor unit, and has been a practical problem.

The present invention solves the above-mentioned conventional drawbacks, and one embodiment thereof will be described below with reference to FIGS. 1 to 4. In the figure, 1 is the outdoor unit, 2 is the first indoor unit, 3 is the second indoor unit,
4 is a compressor, 5 is a four-way valve, 6 is an outdoor heat exchanger, 7
is an expansion valve, 8 is a liquid receiver, 9, 10, 11, 12 are electromagnetic valves built into the outdoor unit, 13 is the indoor unit 1 on the higher side of the connection piping 14, 15, 16, 17. A control valve for controlling the refrigerant flow path provided on the piping 14 side of unit 2, 18 an expansion mechanism of indoor unit 1 2, 19 an indoor heat exchanger,
20 is an expansion mechanism of indoor unit No. 2 3, and 21 is an indoor heat exchanger thereof. Figure 2 shows such a one-to-two
An example of a multi-type installation is shown. That is, the outdoor unit 1 is installed outside the wall surface 22, and the indoor unit No. 1 2 is installed at almost the same height as the outdoor unit 1 (on the second floor side).
Indoor unit No. 2 3 is installed at a low position on the floor side. 23 is the main body of the control valve 13, 24 is a union portion connected to the piping 14 side, and 25 is the main body 23.
26 is a movable valve body with a refrigerant flow path 27 formed in the center, and a contact part 28 provided at one end of the circumference of the union part 24 is provided at one end of the movable valve body 26. Contact part 2 that comes into contact with and slides on
There are 9. 30, a valve portion 31 provided at the other end of the movable valve body 26 contacts a main body protrusion 32;
Valve opening/closing port that closes during heating and opens during cooling, 3
3 is a sealing surface, 34 is a packing that comes into contact with the sealing surface 33, 35 is a piping connection end that becomes the outdoor unit side piping (liquid side), 36 is a pressing part provided at the tip of the piping connection end 35; The pressing part 36 is the main body 2
3, the gasket 34 is pressed against the sealing surface 33 and then screwed together to press the gasket 34 to prevent leakage. FIG. 4 37 shows an external refrigerant flow passage provided on the outer periphery of the movable valve body 26, through which refrigerant flows only during cooling, and 38 is a holding piece.

In the above configuration, when the outdoor unit 1 is installed at a higher position, the indoor unit 1 2 is at almost the same height as the outdoor unit 1, and the indoor unit 2 3 is installed at a lower position. A control valve 13 is connected to a pipe 14 through which liquid refrigerant of indoor unit No. 1 2, which is provided at a higher position, flows. This control valve 13 is connected to indoor unit No. 1 2,
The head difference, which is the pressure difference between the second indoor unit 3 and the second indoor unit 3, is set by changing the diameter of the refrigerant flow passage 27. In other words, the larger the head difference, the more the refrigerant flow path 2
7 has a small diameter, and if the head difference is small, the movable valve body 26 with a large diameter of the refrigerant flow passage 27 is incorporated. As a result, during heating, 2
When simultaneous indoor operation is performed, the refrigerant flowing through the indoor unit No. 1 2 installed at the higher position flows only through the refrigerant flow passage 27 of the movable valve body 26, resulting in a pressure loss due to resistance, and this pressure loss is transferred to the lower position side. The difference in the refrigerant flow rate due to the head difference is almost equal to the head difference between the second indoor unit 3 and the second indoor unit 3 installed in the second indoor unit.

Next, during cooling, the refrigerant is transferred to the pipe connection end 35.
Since the liquid refrigerant flows from the side, the movable valve body 26 slides until it hits the abutment part 28 due to the pressure, and the valve opening/closing port 30 is opened and the refrigerant flows from the refrigerant flow passage 27. At the same time, the liquid refrigerant flows from the outside refrigerant flow passage 37. flows with almost no pressure loss, so indoor unit 1
Almost the same amount of refrigerant circulates in the unit 2 and the indoor unit 2 and 3.

In this way, the present invention is designed to compensate for the head differential pressure between the low position side and the high position side of the indoor unit during heating operation by connecting the pipes of the indoor unit installed at the high position side to match the head differential pressure during heating operation. Even if there is a head difference between indoor unit No. 1 and indoor unit No. 2, the decrease in capacity of the indoor unit at the lower position during heating is almost eliminated, and the configuration is simple. Since it is a controlled valve, it is possible to prevent a decrease in performance without increasing the cost.

In addition, by adding it to an existing multi-type heat pump type separate air conditioner, it is possible to easily eliminate imbalance caused by head differences, and a control valve can be installed depending on the installation conditions.
It has the effect of being able to be additionally installed as needed and not required for mass production.

[Brief explanation of the drawing]

Fig. 1 is a refrigerant circuit diagram according to an embodiment of the present invention, Fig. 2 is an installation diagram of a unit installed in the same room with a height difference, Fig. 3 is a sectional view of the control valve, and Fig. 4 is a movable valve body. FIG. 1... Outdoor unit, 2, 3... Indoor unit, 13... Control valve, 14, 15, 16, 17...
...Piping, 23...Main body, 26...Movable valve body.

Claims (1)

[Claims] 1. In a separate air conditioner in which multiple indoor units installed at different heights are connected via piping to one outdoor unit, the liquid receiving side to the indoor unit installed at a higher position than the outdoor unit is A control valve is installed in the middle of the piping, and the pressure difference between the indoor unit and the indoor unit installed at a lower position is set as a resistance. 1. A separate air conditioner comprising a refrigerant flow path and a movable valve body within the main body that closes in the direction of refrigerant flow during heating and opens during cooling to form an external refrigerant flow path.