KR101467224B1 - Indoor unit with intercooler for multi heat pump - Google Patents

Abstract

[0001] The present invention relates to an indoor unit in which a supercooler is integrally formed. More specifically, the liquid refrigerant flows into the indoor unit at a high pressure in a vertically downward direction, The design heat quantity and flow rate of the refrigerant delivered to the indoor unit are set to a predetermined value and the efficiency of the indoor unit is increased by the primary expansion valve and the secondary pressure reduction and the low temperature conversion by the main expansion valve, The efficiency of the indoor unit is increased by supplementing the subcooling through the second auxiliary expansion valve when the supercooling which is insufficient in the refrigerant passing through the subcooler is recovered to the subcooler through the return pipe.

Description

[0001] The present invention relates to an indoor unit with an intercooler for multi-

[0001] The present invention relates to an indoor unit in which a supercooler is integrally formed. More specifically, the liquid refrigerant flows into the indoor unit at a high pressure in a vertically downward direction, The design heat quantity and flow rate of the refrigerant delivered to the indoor unit are set to a predetermined value and the efficiency of the indoor unit is increased by the primary expansion valve and the secondary pressure reduction and the low temperature conversion by the main expansion valve, And a supercooling unit in which the efficiency of the indoor unit is increased by supplementing the subcooling through the second auxiliary expansion valve when the subcooling is insufficient in the refrigerant passing through the subcooler is recovered to the subcooler through the return pipe.

The refrigeration cycle system is a general term for cooling or heating devices using heat transfer phenomenon of refrigerant, and air conditioning is one of them.

Such a refrigeration cycle system generally includes a compressor for compressing refrigerant in a gaseous state, a condenser for condensing the refrigerant compressed to a liquid state by heat exchange with the surrounding, an expander for decompressing the condensed refrigerant, And the evaporator is vaporized in a state of the evaporator.

In the case of an air conditioner, it is generally separated into an outdoor unit having a compressor and a condenser, and an indoor unit having an inflator and an evaporator. However, when the distance between the outdoor unit and the indoor unit is long, the following problems occur .

When the distance between the outdoor unit and the indoor unit becomes long, the refrigerant pipe for circulation of the refrigerant between the two units becomes longer and becomes a long pipe. Generally, it is preferable that the refrigerant flowing into the inflator of the indoor unit flows into the liquid phase. As the refrigerant coming out of the condenser flows along the long pipe, the pressure of the refrigerant drops due to the head loss due to friction and other influences in the pipe. Part of it is changed to gas state. When the refrigerant including some gaseous state flows into the inflator, the mass flow rate of the refrigerant is drastically reduced and the performance of the indoor unit is degraded.

Korean Patent Registration No. 10-0564449 Korean Patent Publication No. 10-2008-0024937 Korean Patent Publication No. 10-2006-0029490

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art,

When the liquid refrigerant flows into the indoor unit at a high position in a vertical downward direction, the refrigerant flows into the indoor unit at high pressure. To prevent this, the first auxiliary expansion valve is first depressurized at the beginning of the inlet pipe, And an object of the present invention is to provide an indoor unit unit in which a supercooling unit in which the design heat quantity and flow rate of the refrigerant transferred to the indoor unit are changed to a set value and the efficiency of the indoor unit increases.

The supercooling device, in which the efficiency of the indoor unit is increased through the second auxiliary expansion valve when the supercooling which is insufficient in the refrigerant passing through the supercooler is recovered to the supercooler through the return pipe, is integrated with the supercooler through the supercooler Another object is to provide an indoor unit unit formed.

To achieve the above object, the present invention provides an indoor unit unit in which an inlet pipe through which a high-pressure liquid refrigerant is transferred and a discharge pipe through which low-pressure vapor refrigerant is transferred are connected,

A first auxiliary expansion valve installed in the inflow pipe for first reducing the pressure when the liquid refrigerant is equal to or higher than a set pressure;

A supercooling device connected to the inflow pipe so as to penetrate through the inflow pipe and supercooling through heat exchange to remove gas in liquid refrigerant transferred through the inflow pipe;

An indoor unit connected to the inflow pipe and the discharge pipe to transfer the low temperature low pressure refrigerant transferred through the supercooler to the room through heat exchange;

A main expansion valve installed in an inlet pipe connected to the indoor unit for expanding the refrigerant flowing into the indoor unit and expanding the refrigerant to a low temperature and a low pressure;

A subcooling device connected to the main expansion valve and the indoor unit, the subcooler being branched from the main expansion valve and being fed through the main expansion valve to a predetermined temperature or higher, or when the gas is mixed in the refrigerant, A return pipe formed to pass through the inside;

And a solenoid valve installed at one end of the return pipe to open and close the refrigerant to be recovered. The present invention relates to an indoor unit in which a supercooler is integrally formed.

In order to achieve the above object, in the present invention, the liquid refrigerant flows into the indoor unit at a high pressure when the liquid refrigerant flows into the indoor unit at a high position in a vertically downward direction. In order to prevent this, The primary reduced pressure is converted into the second reduced pressure and the low temperature by the main expansion valve so that the design heat quantity and the flow rate of the refrigerant transferred to the indoor unit are set to a predetermined value and the efficiency of the indoor unit is increased.

Also, when the supercooling device is supercooled by the supercooler and the subcooling which is insufficient in the refrigerant passing through the supercooler is recovered to the supercooler through the recovery pipe, the efficiency of the indoor device is increased by supplementing the supercooling through the second auxiliary expansion valve.

1 is a schematic view showing an indoor unit according to a first embodiment of the present invention,
2 is a schematic view showing an indoor unit according to a second embodiment of the present invention,
FIG. 3 is a schematic view showing an ph-phase diagram according to the first and second embodiments of the present invention,
4 is a schematic view showing a ph direction in a downward direction according to the first and second embodiments of the present invention.

The present invention has the following features in order to achieve the above object.

The present invention relates to an indoor unit unit in which an inlet pipe through which a high-pressure liquid refrigerant is transferred and a discharge pipe through which a low-pressure vapor refrigerant is transferred are connected,

A first auxiliary expansion valve installed in the inflow pipe for first reducing the pressure when the liquid refrigerant is equal to or higher than a set pressure;

A supercooling device connected to the inflow pipe so as to penetrate through the inflow pipe and supercooling through heat exchange to remove gas in liquid refrigerant transferred through the inflow pipe;

An indoor unit connected to the inflow pipe and the discharge pipe to transfer the low temperature low pressure refrigerant transferred through the supercooler to the room through heat exchange;

A main expansion valve installed in an inlet pipe connected to the indoor unit for expanding the refrigerant flowing into the indoor unit and expanding the refrigerant to a low temperature and a low pressure;

A subcooling device connected to the main expansion valve and the indoor unit, the subcooler being branched from the main expansion valve and being fed through the main expansion valve to a predetermined temperature or higher, or when the gas is mixed in the refrigerant, A return pipe formed to pass through the inside;

And a solenoid valve installed at one end of the return pipe for opening and closing the recovered refrigerant.

The present invention having such characteristics can be more clearly described by the preferred embodiments thereof.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present.

FIG. 1 is a schematic view showing an indoor unit according to a first embodiment of the present invention. FIG. 2 is a schematic view showing an ph phasic diagram according to a first embodiment of the present invention, and FIG. 3 is a cross- Fig. 3 is a schematic view showing the ph direction in the downward direction according to Fig.

1 to 3, the indoor unit unit 100, in which the supercooler of the present invention is integrally formed, is branched into a high pressure liquid line through which high-pressure liquid refrigerant is delivered, The discharge pipe P2 and the discharge pipe P2 are connected to the low pressure vapor line through which the low pressure vapor refrigerant is transferred and the discharge pipe P2 is connected to the distributor 1, A plurality of inlet pipes P1 and P2 are formed and connected to one indoor unit 100 in pairs. Here, the mode change unit (MCU) will be briefly described. The distributor 1 functions as a valve control box which is operated electronically in order to meet the set operating conditions. The distributor 1 realizes smooth refrigerant distribution through optimal design (1) which can actively cope with situations involving difficulty in distribution such as long pipe and high dropping.

The indoor unit 100 includes a first auxiliary expansion valve 10, a subcooler 20, a main expansion valve 30, a second auxiliary expansion valve 60, and an indoor unit 40. The first auxiliary expansion valve 10, And the discharge pipe P2 is connected to only the indoor unit 40. [0031] As shown in FIG.

The first auxiliary expansion valve 10 is installed in the inlet pipe as shown in FIG. 3, and is an expansion valve for primarily reducing the pressure when the liquid refrigerant is equal to or higher than a predetermined pressure. In this case, the abnormal pressure of the liquid refrigerant means that when the refrigerant is transported vertically downward, the pressure rises due to a rise in pressure when the refrigerant falls from a high freezing point (50 m or more) , The expansion valve is operated to be tightened so that the refrigerant passing through the nozzle neck of the expansion valve reaches the sonic speed and the flow rate does not increase with respect to the speed. This phenomenon is called choking, or suffocation.

The first auxiliary expansion valve 10 serves to primarily depressurize the main expansion valve 30 when the refrigerant passes through the main expansion valve 30. When the refrigerant flows vertically upward, Since it is not high, it is completely opened without using it separately.

Here, the choking refers to a phenomenon in which the subsonic fluid passes through the nozzle neck to reach a sonic speed, and when the fluid reaches the sonic velocity at the nozzle neck, the flow rate of the fluid no longer increases, which is also referred to as suffocation. At this time, the flow rate of the fluid passing through the narrow cross section such as the nozzle neck does not increase any more regardless of the outlet pressure. In this case, the flow rate can be increased only by changing the density by increasing the inlet pressure, and the nozzle neck is limited to the sonic speed. The exit conditions of the nozzle are divided into supersonic and subsonic conditions according to the outlet pressure. If actual choking occurs, the flow rate of the refrigerant at the nozzle neck is limited to the choking condition, which is lower than the refrigerant flow rate required at the actual load side.

The subcooler (20) is connected to penetrate the inflow pipe (P1) and is supercooled by heat exchange so as to remove gas in liquid refrigerant transferred through the inflow pipe (P1). The subcooler Is provided next to the valve (10).

Here, the subcooler 20 is a generally used subcooler, and its configuration and function are not described. In the subcooler 20, an inflow pipe P1 and a return pipe P3 are provided so as to penetrate and the low temperature of the refrigerant transferred through the return pipe P3 is transferred to the refrigerant carrying the inflow pipe P1, do.

The return pipe P3 is branched from the inlet pipe P1 after the supercooler 20 is connected to the one end of the inflow pipe P1 formed through the subcooler 20, And a second auxiliary expansion valve 60 is installed in the return pipe P3. The second auxiliary expansion valve 60 is installed in the subcooler 20, and the second subcooling valve 60 is installed in the subcooler 20 as shown in FIG.

The reason why the refrigerant is partially transferred to the return pipe P3 is that the refrigerant passed through the main expansion valve 30 and transferred to the indoor unit 40 is higher than the set temperature (high temperature = supercooling is insufficient) , The second auxiliary expansion valve (60) is opened by the signal of the control part (not shown), and some refrigerant is recovered by the supercooler (20). At this time, the refrigerant expands to a low temperature while passing through the second auxiliary expansion valve (60), and performs heat exchange with the refrigerant transferred from the supercooler (20) to the inflow pipe (P1).

The end of the recovery pipe P3 passes through the inside of the supercooler 20 and is connected to the discharge pipe P2 to transfer the refrigerant to the low temperature vapor refrigerant transfer pipe.

The main expansion valve 30 is installed in the inflow pipe P1 connected to the indoor unit 40 and is installed after the supercooler 20 as an expansion valve for expanding the refrigerant flowing into the indoor unit 40 to low temperature and low pressure.

The indoor unit 40 is a device for transferring refrigerant of low temperature and low pressure conveyed through the subcooler 20 and the main expansion valve 30 to the room through heat exchange by connecting the inflow pipe P1 and the discharge pipe P2, , The indoor unit device which is generally used does not describe a separate structure and structure.

A sensor unit (not shown) is installed at the outlet of the indoor unit 40, that is, before the refrigerant transferred to the inlet pipe P1 is heat-exchanged, so that the amount of heat and the flow rate of the refrigerant can be measured. The subcooler 20, the second auxiliary expansion valve 60, the main expansion valve 60, the main expansion valve 60, the main expansion valve 60, (30) and the distributor (1).

2 and 3, the low-temperature and low-pressure gaseous refrigerant is compressed into a high-temperature and high-pressure refrigerant through an adiabatic compression process (A → B process) , The high-temperature and high-pressure refrigerant emits heat through the constant pressure condensation process (B → E process) to the super-cooling device (during cooling) and the room (during heating) Thereafter, the refrigerant expands to a low-temperature and low-pressure state through a throttle expansion process (E → F process) and then absorbs external heat during the room (during cooling) or during the atmosphere (during heating) through the constant pressure evaporation process (F → A process) To a gaseous state.

Here, the D → E process is a supercooling process through the supercooler 20, the D → G process is an expansion process through the second auxiliary expansion valve 60, and the G → A process is a supercooling process through the supercooler 20, .

3, the C → D process is a process of expanding the abnormal high pressure generated when the liquid refrigerant is vertically downwardly discharged from the first auxiliary expansion valve 10 through the first auxiliary expansion valve 10.

4 is a schematic view showing an indoor unit according to a second embodiment of the present invention. As shown in FIG. 4, the indoor unit unit in which the supercooler of the present invention is integrally formed has the same structure, structure, and function (operation) as the indoor unit 100 of the first embodiment. However, A solenoid valve 50 is used instead of the second auxiliary expansion valve 60 of the main expansion valve 30 and the recovery pipe P3 is connected between the main expansion valve 30 and the indoor unit 40 by the use of the solenoid valve 50. [ And branches at one end of the inflow pipe P1.

Here, the solenoid valve 50 is installed in the return pipe P3 to open and close the inside of the indoor unit 40. When the refrigerant transferred to the indoor unit 40 is above a set temperature (high temperature = supercooling is insufficient) The solenoid valve 50 is opened by a signal from the control unit, and some of the refrigerant is recovered by the supercooler 20.

Other configurations are the same as those of the first embodiment, and therefore, no description is made.

10: first auxiliary expansion valve 20: supercooler
30: main expansion valve 40: indoor unit
50: Solenoid valve 60: Second auxiliary expansion valve
100: indoor unit

Claims (7)

An indoor unit (100) in which an inlet pipe (P1) through which a high-pressure liquid refrigerant is conveyed and an outlet pipe (P2) through which low-pressure steam refrigerant is conveyed are connected,
A first auxiliary expansion valve (10) installed in the inflow pipe (P1) for primarily reducing the pressure of the liquid refrigerant when the liquid refrigerant is at a predetermined pressure or higher;
A supercooler (20) connected to the inlet pipe (P1) so as to pass through the inlet pipe (P1) and supercooling through heat exchange so as to remove gas in liquid refrigerant conveyed through the inlet pipe (P1);
An indoor unit (40) connected to the inlet pipe (P1) and the discharge pipe (P2) to transfer the low temperature low pressure refrigerant transferred through the supercooler (20) to the room through heat exchange;
A main expansion valve (30) installed in an inlet pipe (P1) connected to the indoor unit (40) and expanding the refrigerant flowing into the indoor unit (40) to low temperature and low pressure;
The refrigerant is branched at the inlet pipe P1 connected between the main expansion valve 30 and the indoor unit and the refrigerant conveyed through the inlet pipe P1 via the main expansion valve 30 is at a set temperature or higher, A recovery pipe P3 formed in the subcooler 20 so as to transfer some of the refrigerant to the subcooler 20;
A solenoid valve (50) installed at one end of the recovery pipe (P3) for opening and closing the recovered refrigerant;
Wherein the subcooler is integrally formed with the subcooler.
An indoor unit (100) in which an inlet pipe (P1) through which a high-pressure liquid refrigerant is conveyed and an outlet pipe (P2) through which low-pressure steam refrigerant is conveyed are connected,
A first auxiliary expansion valve (10) installed in the inflow pipe (P1) for primarily reducing the pressure of the liquid refrigerant when the liquid refrigerant is at a predetermined pressure or higher;
A supercooler (20) connected to the inlet pipe (P1) so as to pass through the inlet pipe (P1) and supercooling through heat exchange so as to remove gas in liquid refrigerant conveyed through the inlet pipe (P1);
An indoor unit (40) connected to the inlet pipe (P1) and the discharge pipe (P2) to transfer the low temperature low pressure refrigerant transferred through the supercooler (20) to the room through heat exchange;
A main expansion valve (30) installed in an inlet pipe (P1) connected to the indoor unit (40) and expanding the refrigerant flowing into the indoor unit (40) to low temperature and low pressure;
When the refrigerant branched at the outlet side inlet pipe P1 of the subcooler 20 and fed through the inflow pipe P1 through the subcooler 20 is at a set temperature or higher or when the gas is mixed in the refrigerant, A recovery pipe (P3) formed through the inside of the supercooler (20) so as to be transferred to the subcooler (20);
A second auxiliary expansion valve (60) installed at one end of the return pipe (P3) for expanding the recovered refrigerant to low temperature and low pressure;
Wherein the subcooler is integrally formed with the subcooler.
3. The method according to claim 1 or 2,
Wherein the indoor unit unit 100 is formed in a plurality of units and each of the indoor units P1 and P2 is connected to the indoor unit unit 100 through a single distributor MCU 1, .
3. The method according to claim 1 or 2,
The first auxiliary expansion valve (10) operates when the liquid refrigerant is conveyed in the vertical downward direction and when the high pressure is higher than the set pressure, the refrigerant expands, and since the refrigerant is below the set pressure at the time of feeding in the vertical upward direction, Wherein the sub-expansion valve (10) is fully opened.
3. The method according to claim 1 or 2,
Wherein an end of the recovery pipe (P3) passes through the interior of the supercooler (20) and is connected to a discharge pipe (P2).
3. The method according to claim 1 or 2,
Wherein a sensor unit is installed at an outlet side of the indoor unit (40) through which the refrigerant is transferred to the room, wherein a sensor unit is installed to measure the amount of heat and flow rate of the refrigerant.
The method according to claim 6,
Wherein the indoor unit unit (100) has a data value measured by the sensor unit, which is transmitted to a control unit through a signal, and is compared with a set data value of the control unit to control the indoor unit unit (100).

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