JPH01219452A - Air conditioner - Google Patents

Abstract

PURPOSE:To make it possible to control the capacity of room unit through a simple mechanism by providing a detector that detects pressure differential between points before and behind a refrigerant carrier, and a controller that controls the capacity of the refrigerant carrier with the pressure differential obtained by the said detector. CONSTITUTION:The capacity of refrigerant carrier 11 is under control by inverter 13. Pressure differential detector 14 detects a pressure differential between before and behind the refrigerant carrier 11, and controller 15 controls the capacity of the refrigerant carrier 11 through controlling the frequency of inverter 13 by the detected pressure differential. In other words, the controller 15 controls the carrying capacity of the refrigerant carrier 11 to suit load of the room unit b, the heat exchanging capacities of 2nd auxiliary heat exchanger 9 and room side heat exchanger 12 by controlling refrigerant circulating quantity in room side refrigerant cycle, and the capacity of the room side refrigerant cycle. The heat exchanging capacity of 1st auxiliary heat exchanger 8 is controlled by that of the and auxiliary heat exchanger 9, and so, it follows that the capacity of heat source refrigerant cycle balances with that of room side refrigerant cycle.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a refrigerant cycle for a heating and cooling system.

BACKGROUND OF THE INVENTION Conventionally, the refrigerant cycle of an air-conditioning system is divided into a heat source-side refrigerant cycle and a user-side refrigerant cycle, as shown in FIG. In Fig. 2, 1 is a compressor, 2 is a heat source [1
111 four-way valve, 3 is a heat source side heat exchanger, 4 is a pressure reducing device for cooling, 6 is a pressure reducing device for heating, 6 is a pressure reducing device 4 for cooling during heating
7 is a check valve that closes the pressure reducing device 6 for heating during cooling, 8 is a first auxiliary heat exchanger, and these are connected in a ring to form a heat source side refrigerant cycle. . 9 is a second auxiliary heat exchanger dg that is integrally formed to exchange heat with the first auxiliary heat exchanger 8. 10 is a refrigerant amount adjustment tank that adjusts the amount of refrigerant during cooling and heating. Reference numeral 11 denotes a refrigerant conveying device which has a reversible characteristic such that the outflow direction of the refrigerant is opposite during cooling and heating, and is housed in the heat source side unit a. Reference numeral 12 denotes a heat exchanger on the user side, which is housed in the user 11111 unit 7) b and is connected to the heat source 11111 unit 7) a through connecting pipes C and C'.

The second auxiliary heat exchanger 9 and the refrigerant amount adjustment tank 10° refrigerant conveying device 11. Usage side heat exchanger 12 and connection piping c
, c' are connected in a ring to form an ILIII refrigerant cycle.

The operation of the heating and cooling system configured as described above will be explained.

During cooling operation, the refrigerant cycle is indicated by the solid arrow in the figure. In the refrigerant cycle on the heat source side, high-temperature, high-pressure gas from the compressor 1 follows the four-way valve 2, releases heat in the heat source 9, condenses and liquefies in the heat exchanger 3, and passes through the check valve. 6, the pressure is reduced by the cooling expansion valve 4, evaporated by the first auxiliary heat exchanger 8, and passed through the heat source side four-way valve 2 to the compressor 1.
circulate to. At this time, the second auxiliary heat exchanger 9 of the user-side refrigerant cycle and the first auxiliary heat exchanger 8 exchange heat, and the gas refrigerant in the user-side refrigerant cycle is cooled and liquefied, and passes through the refrigerant tray adjustment tank 10. The refrigerant is sent to the refrigerant conveying device 11, and by this refrigerant conveying device 11, it is sent to the user-side heat exchanger 12 through the connecting pipe C, where it is cooled and endothermically evaporated, gasified, and passed through the connecting pipe C' to the second refrigerant. It will be circulated to the auxiliary heat exchanger 9.

On the other hand, during heating operation, the refrigerant cycle is as indicated by the broken line arrow in the figure, and in the heat source side refrigerant cycle, the high temperature and high pressure refrigerant from the compressor 1 is transferred from the heat source side four-way valve 2 to the first auxiliary exchanger 8
It radiates heat, condenses and liquefies, reduces the pressure through the check valve 7 in the heating pressure reducing device 6, absorbs heat and evaporates in the heat source side heat exchanger Kg3, and circulates through the heat source side four-way valve 2 to the compressor 1. At this time, the second auxiliary heat exchanger 9 of the user-side refrigerant cycle and the first auxiliary heat exchanger 8 exchange heat, and the liquid refrigerant in the user-side refrigerant cycle is heated and gasified, passing through the connecting pipe C'. It is sent to the heat exchanger 12 on the user side, heated, radiated heat, liquefied, and connected to the heat exchanger 12.
The refrigerant is passed through the refrigerant transport device 11 and circulated from the refrigerant lid adjustment tank 1o to the second auxiliary heat exchanger 9.

Problems to be Solved by the Invention However, in the above configuration, the capacity of the refrigerant conveying device of the utilization side refrigerant cycle is constant, and even if the load of the utilization unit 1111 changes, the capacity of the utilization unit does not change. Eventually, the operation of the heat source unit will have to be stopped. Therefore, the room temperature in the air-conditioned room fluctuates greatly, resulting in a reduction in efficiency.

In order to solve this problem, it has been considered to make the compressor a capacity control type, but this has the problem of increasing cost.

In view of the above-mentioned problems, the present invention provides an air-conditioning device that can control the capacity of a user-side unit using a simple method.

Means for Solving the Problems In order to solve the above problems, the heating and cooling system of the present invention includes a differential pressure detection device for detecting a differential pressure before and after a refrigerant conveying device, and a differential pressure detection device for detecting a differential pressure before and after a refrigerant conveying device, in a user-side refrigerant cycle. The system is equipped with a control device that controls the capacity of the refrigerant conveyance device based on the differential pressure detected by the refrigerant conveyance device.

Effect: With the above-described configuration, the present invention can control the capacity of the refrigerant transport device by the differential pressure before and after the refrigerant transport device of the user refrigerant cycle, and control the amount of refrigerant circulated in the user refrigerant cycle.

EXAMPLE Hereinafter, a heating and cooling system according to an example of the present invention will be described with reference to the drawings. FIG. 1 shows a refrigerant cycle of a heating and cooling system according to an embodiment of the present invention. In FIG. 1, the refrigerant conveying device 11 is controlled by an inverter 13 to increase its capacity. b(J is controlled.

Further, 14 is a differential pressure detection device that detects the differential pressure before and after the refrigerant conveying device 11, and 15 is a differential pressure detecting device that controls the frequency of the inverter 13 based on the differential pressure detected by the differential pressure detecting device 14. controls the ability of

The rest is the same as the conventional example, and the same reference numerals are used here to omit the explanation.゛Also, the operation of this refrigerant cycle is the same as that of the conventional example, and the details are omitted, but the transport capacity of the refrigerant transport device 11 is controlled according to the load of the user unit b), and the refrigerant cycle y of the user side By controlling the refrigerant circulation amount, the heat exchange capacity of the second auxiliary heat exchanger 9 and the user-side heat exchanger 12 is controlled, and the capacity of the user-side refrigerant cycle is controlled.

In addition, the capacity of the heat source side refrigerant cycle is
Since the heat exchange capacity of a8 is controlled by the heat exchange capacity of the second auxiliary heat exchanger 9, it is balanced with the capacity of the user-side refrigerant cycle.

As described above, according to this embodiment, there is a differential pressure detection device that detects the differential force before and after the refrigerant transfer device of the user side refrigerant cycle, and the differential pressure detected by this differential pressure detection device is used to control the refrigerant transfer device. By supplementing the control device that controls the capacity, the capacity of the user-side refrigerant cycle can be adjusted to match the load of the user-side unit, which stabilizes the temperature of the air-conditioned room and improves comfort. This reduces the number of unit shutdowns, increases efficiency, and contributes to energy savings. Note that the user unit is d[
Needless to say, it can also be applied to the case of several devices, and this effect will be even greater.

Effects of the Invention As described above, the present invention includes a utilization-1 refrigerant cycle that includes a differential pressure detection device that detects the differential pressure before and after the refrigerant conveying device, and a differential pressure detected by the differential pressure detecting device to detect the differential pressure of the refrigerant conveying device. Equipped with a control device that controls the capacity, the capacity of the user-side refrigerant cycle (refrigerant circulation amount) can be adjusted to match the load of the user-side unit with a simple configuration, so the temperature of the air-conditioned room is stabilized. This has the effect of improving comfort, reducing the number of shutdowns of the heat source side unit, and improving efficiency.

[Brief explanation of the drawing]

FIG. 1 is a refrigerant cycle diagram of a heating and cooling system according to an embodiment of the present invention, and FIG. 2 is a diagram of a refrigerant cycle of a conventional heating and cooling system. 3...Heat source 1111I heat exchange'l117.8.
...First auxiliary heat exchanger, 9... Second auxiliary heat exchanger, 11... Refrigerant conveyance device, 12...
... Use 11111 Heat exchanger, 14 ... Differential pressure detection device, 16 ... Control device. Name of agent: Patent attorney Nakao Ichimatsu and 1 other person3
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Claims (1)

[Claims] A heat source side refrigerant cycle is formed by connecting a compressor, a heat source side four-way valve, a heat source side heat exchanger, a pressure reducing device, and a first auxiliary heat exchanger in an annular manner, and this first auxiliary heat exchanger is integrally formed. A user-side refrigerant cycle in which a second auxiliary heat exchanger to be exchanged, a capacity-controlled refrigerant transfer device, and a user-side heat exchanger are connected in an annular manner, and a differential pressure detection device that detects a differential pressure before and after the refrigerant transfer device. and a control device that controls the capacity of the refrigerant conveyance device based on the differential pressure detected by the differential pressure detection device.