KR20050082477A - Structure of super-cooling for multi-air conditioner - Google Patents

Abstract

The present invention provides a supercooling structure of a multi-type air conditioner having a refrigerant buffer part temporarily storing refrigerant on one side of an outdoor liquid pipe, and a reverse feed pipe is installed across the inside. The supercooling structure of the multi-type air conditioner according to the present invention includes a refrigerant buffer 130 that is formed in the outdoor liquid pipe 210 ″ and temporarily stores the refrigerant flowing therein, and is installed across the refrigerant buffer 130. It includes a back conveying pipe 130 ', the inside of the back conveying pipe 130' is configured such that a portion of the refrigerant flowing through the outdoor liquid pipe flows back. It is formed to have a larger diameter than the outdoor liquid pipe 210 ", the refrigerant inlet 130a through which the refrigerant is introduced is formed in the upper portion, the refrigerant outlet 130b is discharged from the refrigerant is characterized in that formed in the lower portion. According to the present invention having such a configuration, there is an advantage that the entire cycle is stabilized because it is not affected by the refrigerant loading amount.

Description

Structure of super-cooling for Multi-air conditioner

The present invention relates to an air conditioner, and more particularly, to provide a supercooling structure of a multi-type air conditioner, in which a refrigerant buffer part for temporarily storing a refrigerant is formed on one side of an outdoor liquid pipe, and a reverse feed pipe is installed across the inside. .

In general, an air conditioner is a cooling / heating system that cools a room by a repetitive action of inhaling hot air in a room, exchanging heat with a low temperature refrigerant, and then discharging it into the room. -Condenser-Expansion valve-Evaporator which forms a series of cycles.

In addition, in recent years, there are various additions such as air purifying function that sucks and contaminates indoor contaminated air in addition to heating and cooling, and then makes it into clean air and reinjects it into the room, and dehumidifying function makes the humid air into wet and dry air and reinjects it into the room. It also serves as a functional.

Meanwhile, as is well known, air conditioners can be broadly classified into a separate type air conditioner in which the outdoor unit and the indoor unit are separately installed, and an integrated air conditioner in which the outdoor unit and the indoor unit are integrally installed.

In addition, recently, a multi-type air conditioner has been released that can be effectively applied when installing two or more air conditioners in a home or when installing an air conditioner in each office in a building having several offices. This multi-type air conditioner is connected to a plurality of indoor units in one outdoor unit, it is possible to obtain the same effect as installing a plurality of separate air conditioner.

1 is a schematic view showing an installation state of a conventional multi-type air conditioner, and FIG. 2 is a block diagram showing a configuration of a conventional multi-type air conditioner and a flow of a refrigerant. Referring to this, the outdoor unit 1 includes a compressor 10, an accumulator 15, an outdoor heat exchanger 30, and the like, and the indoor unit 50 includes an indoor heat exchanger 60 and an expansion valve 70.

In addition, in the multi-type air conditioner, a plurality of indoor units 50 are connected to one outdoor unit 1, and a high pressure pipe 80 having a high pressure and a relatively low pressure are connected between the outdoor unit 1 and the indoor unit 50. The low pressure pipe 90 of pressure is respectively connected.

When the air conditioner of the configuration described above performs the cooling action, the outdoor heat exchanger 30 of the outdoor unit 1 serves as a condenser to condense the high-temperature / high pressure gaseous refrigerant fed from the compressor 10. The refrigerant condensed as described above is expanded to a low-temperature / low-pressure gas while passing through the expansion valve 70 and is sent to the indoor heat exchanger 60.

The refrigerant introduced into the indoor heat exchanger 60 is converted into a two-phase refrigerant in which gaseous and liquid states of low temperature / low pressure are mixed as heat is exchanged with indoor air. The refrigerant is passed through the accumulator 15 and then sent to the compressor 10 again to form one cycle of the refrigerant.

Next, when the air conditioner performs the heating operation, the flow of the refrigerant and the action of the heat exchanger are reversed. That is, the refrigerant compressed by the compressor 10 flows in the order of the accumulator 15-> indoor heat exchanger 60-> expansion valve 70-> outdoor heat exchanger 30.

At this time, the indoor heat exchanger 60 serves as a condenser for heat exchange between the high temperature / high pressure refrigerant passing through the inside and the indoor air, and the outdoor heat exchanger 30 includes the low temperature / low pressure refrigerant and the outdoor air therein. It serves as an evaporator to heat exchange.

As illustrated in FIG. 2, the outdoor unit 1 is provided with a subcooler 20 to further cool the refrigerant exchanged in the outdoor heat exchanger 30. The supercooler 20 is formed as a double tube at any position of the outdoor liquid pipe 80 connected to the outlet side of the outdoor heat exchanger 30.

That is, the outdoor liquid pipe 80 is provided on the inside and the reverse transfer pipe 21 is formed on the outside. Accordingly, the reverse conveying pipe 21 is branched from the outlet of the subcooler 20, and the reverse conveying pipe 21 is provided with a subcooling expansion valve 23 for cooling the refrigerant by expansion.

In this case, a part of the refrigerant discharged from the subcooler 20 flows into the reverse transfer pipe 21 to be cooled while passing through the subcooling expansion valve 23, and the cooled refrigerant cools the subcooler 20. The reflux allows the coolant inside to cool further. The countercurrent refrigerant exiting the subcooler 20 is supplied to the compressor 10 through the accumulator 15 and circulated again.

On the other hand, a liquid pipe temperature sensor 22 for measuring the temperature of the refrigerant discharged from the outdoor unit 1 is installed at the outlet of the subcooler 20, and the subcooling inlet sensor 24 at the outlet of the subcooling expansion valve 23. Is provided to measure the temperature of the reverse flow refrigerant flowing into the subcooler 20, the reverse cooling pipe 21 through which the reverse flow refrigerant discharged from the subcooler 20 is provided with a subcooling outlet sensor (25).

Therefore, the refrigerant passing through the outdoor heat exchanger 30 flows through the central portion and is configured such that the low temperature refrigerant expanded by an expansion valve (not shown) flows in the opposite direction to lower the temperature of the refrigerant.

A dryer 26 is provided at one side of the subcooler 20, that is, one side of the outdoor liquid pipe 80 through which the refrigerant discharged from the outdoor heat exchanger 30 is guided to the indoor unit 50. The dryer 26 serves to remove moisture contained in the refrigerant flowing through the outdoor liquid pipe 80.

3 to 5 show a conventional outdoor unit 1. As shown in these figures, the base fan 2 is formed in the lower portion is seated a number of parts, the front end of the base fan 2 is provided with a front panel 4 to form a front appearance. The front panel 4 includes an upper front panel 4 'provided at an upper side and a front lower panel 4 "provided at a lower side thereof.

The front lower panel 4 "is further provided with a pipe bracket 4" a. That is, the lower end of the front lower panel 4 "is cut in a predetermined portion, and the cutoff portion is configured to shield the pipe bracket 4" a, and the pipe bracket 4 "a is the high pressure pipe 80. The low pressure pipe (90) is guided to be installed in communication with the indoor unit (50).

A center bracket 6 is installed between the front upper panel 4 'and the front lower panel 4 "to guide the installation. Meanwhile, an upper bracket 6' is provided at the upper end of the front upper panel 4 '. The upper bracket 6 'is further installed, and the front end of the motor mount 48', which will be described below, is fastened.

The front frame 8 is provided at the left and right ends of the front panel 4, that is, the front left and right edges of the base pan 2. The front frame 8 is formed long and vertically to support the front panel 4 and the side grill 34 to be described below.

The base fan 2 is provided with a compressor 10. The compressor 10 is to compress the refrigerant to be a high temperature and high pressure, respectively provided on the left and right sides. That is, the constant speed compressor 10 'for constant speed operation is installed on the right side, and the inverter compressor 10 "is installed on the left side.

One side of the compressor 10 is provided with an oil separator 12, respectively. The oil separator 12 filters the oil mixed in the refrigerant discharged from the compressor 10 to be recovered to the compressor 10.

The valve support 14 is installed at a predetermined height at the left rear end of the base pan 2, and the service valve 16 is installed and supported at an upper end of the valve support 14.

An accumulator 15 is installed between the central portion of the base fan 2, that is, between the constant speed compressor 10 'and the inverter compressor 10 ". The accumulator 15 filters the liquid refrigerant so that only the refrigerant in the gaseous state is provided. To be introduced into the compressor (10).

The control box 22 is installed above the compressor 10. Although not shown, the control box 22 includes control components such as voltage transformers and capacitors, and a circuit board. The control box 22 has a rectangular box shape with an open front, and a control cover 22 'is provided at the front to shield the inside.

The outdoor end heat exchanger 30 is provided at the side end and the rear end of the base fan 2. The outdoor heat exchanger (30) is provided in pairs on the left and right to allow heat exchange between the refrigerant flowing inside and the outside air.

That is, the left outdoor heat exchanger 30 'in the' ┏ 'shape (viewed from above) is installed on the left side, and the right outdoor heat exchanger 30 "in the' ┓ 'shape (viewed from the top) is installed on the right side. Then, the tube assembly 32 for guiding the inflow of the refrigerant is further formed at the inlet of the outdoor heat exchanger 30, and the receiver 33 is formed at the outlet.

The side grille 34 is installed at the left end and the right end of the base fan 2, and the rear grille 36 is installed at the rear end thereof. The rear grill 36 is provided with a pair to correspond to the outdoor heat exchanger (30). That is, it consists of a left rear grill 36 'installed behind the left outdoor heat exchanger 30' and a right rear grill 36 "provided behind the right outdoor heat exchanger 30".

In addition, a rear frame 38 for fixing the rear grill 36 is provided between the left rear grill 36 ′ and the right rear grill 36 ′, and the rear end left and right edges of the base pan 2 are provided. Rear frames 38 'are each formed.

The top face of the outdoor unit 1 is formed by the top panel 40. The top panel 40 is formed of a square flat plate corresponding to the base pan 2, and a pair of vent holes 40 'are formed at left and right sides of the center.

The shroud 42 is installed on the upper surface of the vent hole 40 '. The shroud 42 has a cylindrical shape protruding upward, and guides the air discharged to the outside by the blowing fan 46 to be described below. The discharge grill 44 is provided at the top of the shroud 42.

The blowing fan 46 is installed inside the shroud 42. The blowing fan 46 is rotated by the fan motor 48 provided below, and serves to discharge the internal air to the outside. On the other hand, the fan motor 48 is mounted by a motor mount 48 '.

However, the above-described prior art has the following problems.

In the prior art as described above, the liquid refrigerant discharged from the outdoor heat exchanger (30) flows into the subcooler (20) through the outdoor liquid pipe (80), and a part of the refrigerant passes through the reverse transfer pipe (21). After expanding through 23, it was configured to cool the refrigerant while refluxing the subcooler 20.

Accordingly, since the gaseous refrigerant is also expanded through the subcooling expansion valve 23 during the liquid refrigerant flowing into the reverse conveying pipe 21, there is a problem in that the role of the subcooling expansion valve 23 is not properly performed.

An object of the present invention for solving the problems of the prior art as described above, the super-cooling structure of the multi-type air conditioner to form a refrigerant buffer to temporarily store the refrigerant on one side of the outdoor liquid pipe, the reverse feed pipe is installed across the interior To provide.

The subcooling structure of the multi-type air conditioner according to the present invention for achieving the above object is a refrigerant buffer unit for temporarily storing the refrigerant flowing and formed in the outdoor liquid pipe, and is installed across the inside of the refrigerant buffer unit Characterized in that configured to include a transfer pipe.

A portion of the refrigerant flowing through the outdoor liquid pipe is configured to flow backward in the back transfer pipe.

The refrigerant buffer is formed to have a larger diameter than the outdoor liquid pipe, the refrigerant inlet through which the refrigerant is introduced is formed in the upper portion, and the refrigerant outlet through which the refrigerant is discharged is formed in the lower portion.

In addition, the refrigerant buffer is characterized in that the gas refrigerant and the liquid refrigerant coexist.

In addition, one side of the reverse transfer pipe is characterized in that the subcooled expansion valve for converting the liquid refrigerant into a low-temperature gas refrigerant by expansion.

According to the subcooling structure of the multi-type air conditioner according to the present invention having the above configuration, only the refrigerant in the liquid state flows into the subcooling expansion valve and is cooled, and thus the entire cycle is stabilized since it is not affected by the refrigerant loading amount. There is this.

Hereinafter, exemplary embodiments of the present invention as described above will be described in detail with reference to the accompanying drawings.

6 is a schematic view showing an installation state of the multi-type air conditioner according to the present invention, and FIG. 7 is a block diagram of the multi-type air conditioner according to the present invention. As illustrated, the outdoor unit 100 includes a constant speed compressor 120, an inverter compressor 120 ′, an accumulator 132, and an outdoor heat exchanger 180 and an outdoor solenoid valve 102 (LEV: linear expansion valve, hereinafter “outdoor”). And the indoor unit 200 is an indoor heat exchanger 202, an expansion valve 204, and an indoor solenoid valve 206 (LEV: LEV '). And so on.

In the multi-type air conditioner, a plurality of indoor units 200 are connected to one or more outdoor units 100. The common liquid pipe 210, which is a single pipe through which liquid refrigerant flows, is connected between the outdoor unit 100 and the indoor unit 200, The common engine 212, which is a single pipe through which gas refrigerant flows, is formed in communication. And, between the two or more outdoor unit 100 is installed in communication with the high and low pressure common pipe 214 to maintain the balance of the refrigerant.

The high and low pressure common pipe 214 is installed such that the inlet side of the outdoor heat exchanger 180 provided in the plurality of outdoor units 100 communicates with each other to maintain the balance of the refrigerant between the outdoor units 100. On the other hand, the refrigerant is also introduced into the outdoor heat exchanger 180 of the outdoor unit 100, which is not used among the plurality of outdoor units 100, thereby bringing the effect of improving the heat exchange efficiency as a whole. In addition, the high or low pressure common pipe 214 is a high-pressure or low-pressure refrigerant flows in accordance with the cooling or heating action.

The indoor unit 200 is formed with a branch liquid pipe 210 'through which liquid refrigerant flows, and a branch engine 212' through which gas refrigerant flows, and such a branch liquid pipe 210 'and a branch engine 212' are common. It is in communication with the liquid pipe 210 and the common engine 212.

In addition, the plurality of branching liquid pipes 210 'and the branching engine 212' are different in diameter depending on the capacity of the indoor unit 200 to be connected, and each indoor unit (by the indoor LEV 206) The flow rate of the refrigerant supplied to 200 is adjusted.

On the other hand, the outdoor unit 100 is formed with an outdoor liquid pipe 210 "through which liquid refrigerant flows, and an outdoor engine 212" through which gas refrigerant flows, and the outdoor liquid pipe 210 "and the outdoor engine 212" are respectively formed. The common liquid pipe 210 is in communication with the common engine 212.

8 to 11 show the outdoor unit system configuration of the air conditioner according to the present invention. As shown in these figures, a base fan 110 forming a bottom surface is provided at the bottom to support a plurality of parts, and the front panel 112 forming a front lower exterior at the tip of the base fan 110. ) Is provided.

The front grill 114 is installed above the front panel 112. Therefore, outside air is sucked through the front grill 114 and passes through the outdoor heat exchanger 180 to be described below. On the other hand, the front upper bracket 116 is further installed on the upper side of the front grill 114, the front end bracket 116 is fastened to the front end of the motor mount 174 to be described below.

Compressors 120 and 120 'are installed on an upper surface of the base fan 110. The compressors 120 and 120 'are configured to compress the refrigerant to be high temperature and high pressure, and are provided at left and right sides, respectively. That is, a relatively constant speed compressor 120 for constant speed operation is installed on the right side, and an inverter compressor 120 'that is a variable speed heat pump is installed on the left side.

A refrigerant injector 120a is installed at the inlet side of the compressors 120 and 120 '. The refrigerant injector 120a prevents the compressor from being burned by supplying a refrigerant when the compressors 120 and 120 'are overheated according to operating conditions. The refrigerant used herein is an outdoor heat exchanger 180 to be described below. It is preferred that the refrigerant discharged from is configured to be used.

A constant oil compressor 121 is installed between the constant speed compressor 120 and the inverter compressor 120 'such that the constant speed compressor 120 and the inverter compressor 120' communicate with each other. Therefore, when oil supply shortage occurs in one of the compressors, the compressor 120 is replenished from another compressor to prevent burnout of the compressors 120 and 120 'due to the flow rate shortage.

As the compressors 120 and 120 ', a low noise and excellent scroll compressor is used. In particular, the inverter compressor 120' is an inverter scroll compressor whose rotation speed is adjusted according to the load capacity. Therefore, when a small number of indoor units 200 are used and the load capacity is small, the inverter compressor 120 'is first operated, and the constant speed is only achieved when the load capacity is gradually increased and cannot be handled only by the inverter compressor 120'. The compressor 120 is operated.

At the outlet side of the constant speed compressor 120 and the inverter compressor 120 ', the compressor discharge temperature sensors 120b and 120'b and the oil separator 122 respectively measure the temperature of the refrigerant discharged from the compressors 120 and 120'. do. The oil separator 122 filters the oil mixed in the refrigerant discharged from the compressors 120 and 120 'to be recovered to the compressors 120 and 120'.

That is, oil used to cool frictional heat generated when the compressors 120 and 120 'are driven is discharged to the outlet of the compressors 120 and 120' together with a refrigerant, and the oil in the refrigerant is separated into the oil separator 122. ) To return to the compressor (120, 120 ') through the oil return pipe (123).

In addition, a check valve 122 ′ is further installed at an outlet side of the oil separator 122 to prevent a backflow of the refrigerant. That is, when only one of the constant speed compressor 120 or the inverter compressor 120 'is operated, the compressed refrigerant is not flowed back into the compressor 120 and 120' that are stopped.

The oil separator 122 is configured to communicate with the four-way valve 124 by the pipe. The four-way valve 124 is arranged to change the flow direction of the refrigerant according to the cooling and heating operation, each port is an outlet (or oil separator) of the compressor (120, 120 '), the inlet of the compressor (120, 120') Or an accumulator), an outdoor heat exchanger 180, and an indoor unit 200.

Therefore, the refrigerant discharged from the constant speed compressor 120 and the inverter compressor 120 ′ is collected into one place and then flows into the four-way valve 124. The compressors 120 and 120 are provided at the inlet of the four-way valve 124. A high pressure sensor 124 'for checking the pressure of the refrigerant discharged from') is installed.

On the other hand, a hot gas pipe (125) for allowing a portion of the refrigerant flowing into the four-way valve 124 in the oil separator 122 is directly introduced to the accumulator 132 to be described below It is installed across the four-way valve (124).

When the hot gas pipe 125 needs to increase the pressure of the low pressure refrigerant flowing into the accumulator 132 during the operation of the air conditioner, the high pressure refrigerant at the discharge port of the compressors 120 and 120 'is directly directed to the inlet side of the compressor 120 and 120'. In order to be supplied, such a hot gas pipe 125 is provided with a hot gas valve 125 ′, which is a bypass valve, to open and close the pipe.

The valve support 126 is installed at the center of the first half of the upper surface of the base pan 110. The valve support 126 serves to support and guide the outdoor liquid pipe 210 ", the outdoor engine 212", and the high and low pressure common pipe 214, and a service valve 128 is also installed therein. Meanwhile, the pipes 210, 212, and 214 supported by the valve support 126 are drawn out through the pipe inlet 188 ′ of the side panel 188, which will be described below, and are connected to the outdoor unit 100.

At the rear left end of the upper surface of the base fan 110, a refrigerant buffer 130 for supercooling the refrigerant flowing through the outdoor liquid pipe 210 " is formed. The refrigerant buffer 130 is an outdoor heat exchange which will be described below. By further cooling the refrigerant heat-exchanged in the unit 180, it is formed at any position of the outdoor liquid pipe 210 "connected to the outlet side of the outdoor heat exchanger 180.

The refrigerant buffer 130 is a tube in which the outdoor liquid pipe 210 ″ is expanded, and a reverse transfer pipe 130 ′, which will be described below, is formed at the center to be connected to the low pressure side across the inside. Inside the 130, the gas refrigerant and the liquid refrigerant are separated and coexist in the up and down, the double liquid refrigerant serves as a buffer so as not to be affected by the amount of refrigerant supplied to the indoor unit 200.

In addition, the refrigerant buffer unit 130 has an inlet side, that is, a refrigerant inlet 130a formed at an upper end thereof, which flows from the outdoor heat exchanger 180 through the outdoor liquid pipe 210 ″, and moves to the indoor unit 200. The outlet side to be discharged, that is, the refrigerant outlet 130b is formed at the lower portion so that the refrigerant inlet 130a is formed at a position relatively higher than the refrigerant outlet 130b.

On the other hand, a reverse transfer pipe 130 'is formed in the outdoor liquid pipe 210 "connected to the outlet of the refrigerant buffer 130. The reverse transfer pipe 130' is formed from the outdoor heat exchanger 180. The refrigerant is discharged and flows through the outdoor liquid pipe 210 ″ to guide the refrigerant to flow back into the refrigerant buffer 130.

In addition, the reverse transfer pipe 130 ′ is provided with a subcooled expansion valve 130 ′ a that converts the liquid refrigerant into a low temperature gas refrigerant by expansion. In addition, the subcooled expansion valve (130 'a) is able to adjust the amount of the refrigerant flowed back through the back conveying pipe (130'). Thus, the refrigerant passing through the refrigerant buffer 130 is to the temperature desired by the user. That is, as the amount of the refrigerant flowing back through the back conveying pipe 130 ′ increases, the temperature of the refrigerant passing through the refrigerant buffer 130 will be lowered.

When a part of the refrigerant discharged from the refrigerant buffer unit 130 is introduced into the reverse conveying pipe 130 'by the configuration as described above, the refrigerant is expanded while passing through the subcooling expansion valve 130'a and is a low-temperature gas refrigerant. When the low temperature gas refrigerant flows through the refrigerant buffer 130, the liquid refrigerant flowing into the refrigerant buffer 130 through heat exchange is further cooled.

As such, the liquid refrigerant discharged from the outdoor heat exchanger 180 is further cooled by the heat conduction while passing through the refrigerant buffer unit 130 and supplied to the indoor unit 200, and discharged from the refrigerant buffer unit 130. The countercurrent refrigerant is fed back to the compressors 120 and 120 'via the accumulator 132, which will be described below, and circulated.

A dryer 131 is provided at one side of the refrigerant buffer 130, that is, at one side of the outdoor liquid pipe 210 ″ in which the refrigerant discharged from the outdoor heat exchanger 180 is guided to the indoor unit 200. The dryer 131 serves to remove moisture contained in the refrigerant flowing through the outdoor liquid pipe 210 ".

An accumulator 132 is installed between a central portion of the base fan 110, that is, between the constant speed compressor 120 and the inverter compressor 120 ′. The accumulator 132 filters the liquid refrigerant so that only the gaseous refrigerant flows into the compressors 120 and 120 '.

That is, when the refrigerant remaining in the liquid phase without being evaporated into gas among the refrigerant flowing from the indoor unit 200 directly flows into the compressors 120 and 120 ', the compressor is formed into a gaseous refrigerant having a high temperature and high pressure. The load is increased at '), which causes damage to the compressors 120 and 120'.

Therefore, among the refrigerants introduced into the accumulator 132, the refrigerant that is not evaporated and remains in the liquid phase is stored in the lower portion of the accumulator 132 because it is relatively heavier than the refrigerant in the gas phase, and only the gaseous refrigerant in the upper portion of the compressor ( 120,120 '). On the other hand, the inlet side of the accumulator 132 is provided with a suction pipe temperature sensor 132 ′ for measuring the temperature of the refrigerant sucked and a low pressure sensor 132 ″ for checking the pressure of the refrigerant.

Front frames 134 and 134 'are formed at both ends of the base pan 110, respectively. The front frames 134 and 134 'are formed vertically long at the tip of the base fan 110, and are divided into a front left frame 134 installed at the left end and a front right frame 134' installed at the right end. .

The front frames 134 and 134 'support the front upper bracket 116, the front grill 114, and the control boxes 140 and 140' to be described below. On the other hand, the center frame 136 is provided at the center of the front left frame 134 and the front right frame 134 'from side to side.

Control boxes 140 and 140 ′ are installed below the central frame 136. The control boxes 140 and 140 'are formed in pairs on the left and right sides. That is, the left control box 140 provided on the left side and the right control box 140 'provided on the right side, the left control box 140 is hinged to the front left frame 134 by a hinge (140a) The right control box 140 'is fixed to the front right frame 134' by a hinge 140'a.

The control boxes 140 and 140 'each have a rectangular box shape whose front is opened, and the front is shielded by the front panel 112. The left control box 140 is provided with a control component such as a voltage transformer 142 and a capacitor 144 and a heat dissipation element plate 146.

A heat radiating portion 146 ′ formed of heat radiating fins is formed on a rear surface of the heat radiating element plate 146. On the other hand, a heat radiation fan 148 is installed on the upper rear side of the left control box 140, the heat radiation fan 148 is composed of a cross flow fan. Therefore, when the heat radiating fan 148 sucks air and discharges it upward, heat exchange in the heat radiating portion 146 'is promoted, and the heat radiating element plate 146 is cooled.

Since the side ends of the control boxes 140 and 140 'are mounted to the front frames 134 and 134' by hinges 140a and 140'a, the hinges 140a and 140'a can be pivoted forward on the axis. Done. Therefore, when after-sales service of the internal parts is required, the control boxes 140 and 140 'may be rotated forward.

The barrier 150 is installed in the central frame 136. The barrier 150 divides the inside of the outdoor unit 100 into an upper space and a lower space. That is, the compressor 120, 120 'and the control box (140, 140') and the lower side is installed, and the outdoor heat exchanger 180 to be described below is partitioned.

The barrier 150 is provided on the left and right sides similarly to the control boxes 140 and 140 '. The barrier 150 has a horizontal portion 150 'formed rearward from the center frame 136 and an inclined portion 150 " formed to be inclined at a predetermined angle downward from the rear end of the horizontal portion 150'. )

Meanwhile, an air guide hole 152 is formed in the horizontal portion 150 ′ of the left barrier 150 of the barrier 150, and an air guide cover 154 is installed above the air guide hole 152. . The air guide cover 154 is configured such that the front and the top is shielded and the rear is opened, so that the air forcedly blown from the heat radiating fan 148 provided at the bottom is guided to the rear.

The upper surface of the outdoor unit 100 is formed by the upper panel 160. The top panel 160 has a square flat plate shape and is provided in pairs on the left and right sides. In addition, a vent hole 162 is formed in the upper panel 160, and an edge of the vent hole 162 extends downward to form a cylindrical shroud 164. The shroud 164 is formed integrally with the upper panel 160, preferably made of a plastic material.

The shroud 164 is formed in a cylindrical shape to guide the air forcedly blown by the blowing fan 170 to be described below. On the other hand, a circular discharge grill 166 corresponding to the vent hole 162 is mounted on the upper side of the shroud 164, that is, the vent hole 162.

The blowing fan 170 is installed inside the shroud 164. The blowing fan 170 is rotated by the fan motor 172 provided at the bottom, and discharges the air therein upward. That is, when the fan motor 172 generates a rotational force by the power applied from the outside, the blowing fan 170 fixed to one end of the rotation shaft of the fan motor 172 is rotated to discharge the air upwards. .

The fan motor 172 is fixed by the motor mount 174. The motor mount 174 is composed of a fixed plate 174 'of a square plate and a support 174 "for supporting the fixed plate 174'. The support 174" is formed in a pair on the left and right, The fixing plate 174 'is mounted at the center of the pair of supports 174 ". The front and rear ends of the support 174" are bent upwards, and the front upper bracket 116 will be described below. It is fixed to the upper rear bracket 194, respectively.

An outdoor heat exchanger 180 is provided below the upper panel 160. The outdoor heat exchanger 180 is installed in pairs before and after the heat exchange between the refrigerant flowing inside and the outside air. That is, the front heat exchanger 182 is installed below the front end of the upper panel 160, and the rear heat exchanger 184 is installed below the rear end of the upper panel 160.

The lower half of the front heat exchanger 182 is bent backwards. That is, the vertical portion 182 ′ extending downwardly from the front end portion of the front panel 112 by a predetermined length and the inclined portion 182 ″ formed to be inclined at a predetermined angle backward from the bottom of the vertical portion 182 ′. It is composed.

Accordingly, the lower end of the inclined portion 182 ″ and the lower end of the rear heat exchanger 184 are adjacent to each other, and the lower end of the outdoor heat exchanger 180 has a predetermined distance from the base fan 110. Meanwhile, a tube assembly 180 'is further formed at a side surface of the outdoor heat exchanger 180 to distribute the refrigerant supplied from the compressors 120 and 120' to each part.

On the other hand, the heat exchanger temperature sensor 180a for measuring the temperature of the heat exchanger is installed inside the outdoor heat exchanger 180, and the outdoor temperature sensor 180b for measuring the temperature of the outside is further provided.

A drain pan 186 is provided below the lower end of the outdoor heat exchanger 180. The drain pan 186 is formed long to the left and right and collects the condensed water generated in the outdoor heat exchanger 180 and discharges it to the side.

Side panels 188 are installed at left and right ends of the upper surface of the base fan 110. The side panel 188 forms a side appearance of the outdoor unit 100, and pipe entrance holes 188 'are formed at the lower end before and after.

The rear grill 190 is installed at the rear end of the base fan 110. The rear grill 190 is formed to correspond to the size of the rear heat exchanger 184, the rear panel 192 is provided below the rear grill 190.

The upper rear bracket 194 is formed to the left and right at an upper end of the rear grill 190. The upper rear bracket 194 is installed on the upper front surface of the rear grill 190 to support the rear end of the support 174 ″ of the motor mount 174.

On the other hand, the rear frame 196 is installed at the rear edge of the base fan 110. The rear frame 196 is elongated upward and downward to support the rear grill 190, the rear panel 192, and the upper panel 160.

Hereinafter, the operation of the multi-type air conditioner according to the present invention having the configuration as described above will be described with reference to FIGS.

As described above, in the air conditioner according to the present invention, a plurality of indoor units 200 are connected to one outdoor unit 100, and some or all indoor units 200 are operated according to a user's selection.

When the air conditioner is operated (cooling operation), the outdoor LEV 102 is opened so that the refrigerant flows between the outdoor unit 100 and the indoor unit 200. At this time, the amount of refrigerant is controlled by the indoor LEV 206 and the indoor LEV 206 of the indoor unit 200 which is not used is closed.

First, referring to the refrigerant flow in the outdoor unit 100, the gas refrigerant flowing from the indoor unit 200 passes through the four-way valve 124 and then enters the accumulator 132. The gas refrigerant leaving the accumulator 132 is introduced into the compressors 120 and 120 '. On the other hand, when the refrigerant supplied to the compressors 120 and 120 'is insufficient or the compressors 120 and 120' are overheated, the refrigerant is supplied from the refrigerant injector 120a.

The refrigerant compressed by the compressors 120 and 120 ′ is discharged to the discharge port and passes through the oil separator 122. In the oil separator 122, oil contained in the refrigerant is separated and recovered to the compressors 120 and 120 ′ through the oil recovery pipe 123.

That is, as the refrigerant is compressed in the compressors 120 and 120 ', oil is mixed in the refrigerant. Since the oil is in the liquid state and the refrigerant is in the gas state, the oil is separated from the oil separator 122 which is the gas-liquid separator.

On the other hand, the oil inside the compressor (120, 120 ') of both sides by the constant flow compressor 120 and the funnel oil pipe 121 connecting the inverter compressor (120') to maintain a balance.

The refrigerant passing through the oil separator 122 flows into the outdoor heat exchanger 180 through the four-way valve 124. Since the outdoor heat exchanger 180 functions as a condenser (in the cooling mode), the refrigerant is cooled through heat exchange with external air to become a liquid refrigerant. The refrigerant passing through the outdoor heat exchanger 180 is further cooled while passing through the refrigerant buffer 130.

That is, when a part of the refrigerant discharged from the refrigerant buffer 130 is introduced into the reverse conveying pipe 130 ', it is expanded while passing through the subcooling expansion valve 130'a to be a low temperature gas refrigerant. As the low-temperature gas refrigerant flows back through the inside of the refrigerant buffer 130 along the back transfer pipe 130 ′, the liquid refrigerant flowing into the refrigerant buffer 130 through heat exchange is further cooled.

The refrigerant passing through the refrigerant buffer 130 passes through a dryer 131 for removing moisture contained in the refrigerant, and then flows into the indoor unit 200 through the common liquid pipe 210. Meanwhile, some of the refrigerant passing through the compressors 120 and 120 'may be introduced into the other outdoor unit 100 through the high and low pressure common pipe 214.

The refrigerant supplied to the other outdoor unit 100 through the high and low pressure common pipe 214 is introduced into the outdoor heat exchanger 180 of the outdoor unit 100 that is stopped to balance the refrigerant pressure as a whole, and the outdoor unit that is stopped ( The predetermined heat exchange also occurs through the outdoor heat exchanger 180 of 100).

When the refrigerant is supplied to the indoor unit 200 through the common liquid pipe 210, the refrigerant is supplied to each indoor unit 200 in operation through the branched liquid pipe 210 ′ branched from the common liquid pipe 210. The refrigerant is decompressed in the expansion valve 204 and heat exchanges in the indoor heat exchanger 202. At this time, since the indoor heat exchanger 202 serves as an evaporator, the refrigerant becomes low pressure gas through heat exchange.

The refrigerant discharged from the indoor heat exchanger 202 is collected through the branch engine 212 ′ to the common engine 212 and then flows into the outdoor unit 100. The refrigerant introduced into the outdoor unit 100 through the common engine 212 and the outdoor engine 212 ″ enters the accumulator 132 through the four-way valve 124.

In the accumulator 132, the liquid refrigerant that has not been evaporated is filtered out, and only the refrigerant in the gaseous state is selected and supplied to the compressors 120 and 120 '. Through this process, one cycle is completed.

On the other hand, when it is operated by the heating operation, the refrigerant flows in the opposite direction to the above, the indoor LEV 206 of the indoor unit 200 is opened, the amount of refrigerant in the outdoor LEV 102 is adjusted.

Next, looking at the air flow in the outdoor unit 100, the fan motor 172 is driven in accordance with the application of power to drive the blowing fan 170. When the blowing fan 170 is rotated, outside air is introduced into the inside through the front grill 114 and the rear grill 190.

Air introduced into the outdoor unit 100 undergoes heat exchange while passing through the outdoor heat exchanger 180. At this time, when the air conditioner acts as cooling, the outside air receives heat from the outdoor heat exchanger 180 and becomes high temperature air. On the contrary, when the air conditioner is operated by heating, the outdoor air exchanger takes heat away from the outdoor heat exchanger 180 and It becomes air.

Air passing through the outdoor heat exchanger 180 is forcibly blown upward by the blower fan 170, and the shroud 164 guides the discharge of air upward.

The scope of the present invention is not limited to the above-exemplified embodiments, and many other modifications based on the present invention will be possible to those skilled in the art within the above technical scope.

As described above, in the supercooling structure of the multi-type air conditioner according to the present invention, a refrigerant buffer part for temporarily storing a refrigerant is formed on one side of the outdoor liquid pipe, and a reverse transfer pipe is installed across the inside of the conventional liquid cooler and fluid. The groups were combined.

Therefore, the function of the receiver is added so that only the liquid refrigerant flows into the subcooled expansion valve and expands, and the gas buffer and the liquid refrigerant coexist in the refrigerant buffer to buffer the refrigerant. By doing so, the effect of stabilizing the entire cycle of the air conditioner is expected.

As a result, the overall cycle is stabilized, and the effect of improving the efficiency of the air conditioner is also expected.

1 is a state diagram of the conventional multi-type air conditioner.

Figure 2 is a block diagram showing the configuration of the conventional multi-type air conditioner and the refrigerant flow.

Figure 3 is a perspective view showing the appearance of the outdoor unit of the conventional air conditioner.

Figure 4 is an exploded perspective view showing the configuration of a conventional air conditioner outdoor unit.

Figure 5 is a front view inside the front panel of the conventional air conditioner outdoor unit removed.

Figure 6 is a state diagram of the multi-type air conditioner according to the present invention.

Figure 7 is a block diagram showing the configuration and refrigerant flow of the multi-type air conditioner according to the present invention.

8 is a detailed block diagram of an outdoor unit of an air conditioner according to the present invention.

9 is a perspective view showing the appearance of the outdoor unit of the air conditioner according to the present invention.

10 is an exploded perspective view showing the internal configuration of the outdoor unit of the air conditioner according to the present invention.

11 is an internal front view of the front panel of the multi-type air conditioner outdoor unit according to the present invention is removed;

Explanation of symbols on the main parts of the drawings

100. Outdoor unit 102. Outdoor solenoid valve

110. Base Fan 112. Front Panel

114. Front Grill 116. Front Upper Bracket

120. Constant speed compressor 120 '. Inverter Compressor

120a. Refrigerant injector 121.

121 '. Strainer Oil Temperature Sensor 122. Oil Separator

123. Oil return pipe 124. Four-way valve

126. Valve Support 128. Service Valve

130. Refrigerant buffer 130 '. Station

132. Accumulators 134,134 '. Front frame 136. Center frame 140. Left control box 140 '. Right control box 142. Voltage transformer 144. Capacitor 146. Heat sink 146 '. Heat dissipation part 148. Heat dissipation fan 150. Barrier 152. Air guide 154. Air guide cover 160. Top panel 162. Vent 164. Shroud 166. Discharge grill 170. Blower fan 172. Fan motor 174. Motor mount 180. Outdoor Heat exchanger 182. Front heat exchanger 184. Rear heat exchanger 186. Drain pan 188. Side panel 190. Rear grill 192. Rear panel 194. Upper rear bracket 196. Rear frame 200. Indoor unit 202. Indoor heat exchanger 204. Expansion valve 206 Indoor solenoid valve 210. Common fluid line 210 '. Branch liquid pipe 210 ". Outdoor liquid pipe 212. common pipe 212 '. Branch pipe 212". Outdoor organizations 214. High and low pressure common pipe

Claims (5)

Refrigerant buffer unit for temporarily storing the refrigerant flowing in the outdoor liquid pipe, Subcooling structure of the multi-type air conditioner, characterized in that it comprises a back conveying pipe installed across the refrigerant buffer. The supercooling structure of a multi-type air conditioner according to claim 1, wherein a part of the refrigerant flowing through the outdoor liquid pipe flows back in the back transfer pipe. The method of claim 1, wherein the refrigerant buffer unit, It is formed to have a larger diameter than the outdoor liquid pipe, The refrigerant inlet through which the refrigerant is introduced is formed in the upper portion, and the refrigerant outlet in which the refrigerant is discharged is formed in the lower portion of the super-cooling structure of the multi-type air conditioner. The supercooling structure of a multi-type air conditioner according to claim 1 or 3, wherein a gas refrigerant and a liquid refrigerant coexist in the refrigerant buffer unit. The method of claim 1 or 2, wherein one side of the reverse conveying pipe, Subcooling structure of the multi-type air conditioner, characterized in that the subcooling expansion valve for converting the liquid refrigerant into a low-temperature gas refrigerant by expansion.