KR102286976B1 - Air conditioner - Google Patents

Abstract

The present invention relates to an electronic expansion valve disposed in an outdoor unit and configured to expand a refrigerant by adjusting an opening amount according to an applied current value; a buried pipe installed to be embedded in a building and supplied with the refrigerant expanded by the electronic expansion valve; an indoor heat exchanger disposed in the indoor unit and configured to exchange heat between indoor air and the expanded refrigerant; a first distributor for distributing the refrigerant supplied from the buried pipe; a second distributor for receiving and merging the refrigerant distributed to the first distributor and providing the merged refrigerant to the indoor heat exchanger; and the first and second distributors A connection kit including a plurality of distribution pipes connecting the distributors; including, the diameter (D3) of the first distributor being larger than the diameter (D0) of the buried pipe, and the diameter (D5) of each distribution pipe is formed to be smaller than the pipe diameter D0 of the buried pipe, and the expanded refrigerant flows from the first distributor toward the second distributor.
Since the expanded refrigerant flows to the first distributor having a larger diameter than the buried pipe and then passes through each distribution pipe having a smaller diameter than the buried pipe, noise caused by the flow of the expanded refrigerant can be minimized.

Description

air conditioner {Air conditioner}

The present invention relates to an air conditioner, and more particularly, to an air conditioner capable of reducing noise of a refrigerant when the tube diameters of a buried pipe and a refrigerant pipe of a building are different from each other.

In general, an air conditioner is composed of a compressor, a condenser, an evaporator, and an expander, and supplies cold or warm air to a building or room using an air conditioning cycle.

Structurally, the air conditioner is divided into a separate type in which the compressor is disposed outdoors, and an integral type in which the compressor is integrally manufactured.

In the separation type, an indoor heat exchanger is installed in an indoor unit, an outdoor heat exchanger and a compressor are installed in the outdoor unit, and two separated devices are connected through a refrigerant pipe.

Recently, buried piping for connecting indoor units to the interior of a building is installed. Therefore, when installing the indoor unit, instead of directly connecting the outdoor unit and the indoor unit, the outdoor unit pipe and the buried pipe of the building are connected, and the buried pipe and the pipe of the indoor unit are connected.

However, when the diameter of the buried pipe and the pipe diameter of the indoor unit pipe are different, there is a problem that noise is generated at the connection part with the pipe diameter different.

Korean Patent Laid-Open Publication No. 10-2009-0047505 (hereinafter referred to as Prior Art 1) describes a structure for reducing noise by reducing pressure pulsation of a refrigeration apparatus. However, since the muffler structure as in the prior art 1 is a structure that connects a large-volume silencer between refrigerant pipes, noise can be reduced, but the pressure drop of the refrigerant is greatly generated and the cross-sectional area is narrowed at the outlet end of the silencer. There was a problem in that the flow resistance was greatly generated.

Republic of Korea Patent Publication 10-2009-0047505

An object of the present invention is to provide an air conditioner that reduces the noise of a refrigerant by disposing a connection kit between a buried pipe having a different pipe diameter and a pipe of an indoor unit.

An object of the present invention is to provide an air conditioner that minimizes noise caused by two-phase flow of a refrigerant.

An object of the present invention is to provide an air conditioner capable of preventing slug/plug flow formation of a two-phase refrigerant by disposing a capillary tube in a distribution pipe.

An object of the present invention is to provide an air conditioner that minimizes noise caused by two-phase flow of a refrigerant by using a difference in internal volume between a first distributor and a second distributor.

An object of the present invention is to provide an air conditioner that minimizes noise when a two-phase refrigerant flows through the number, diameter, and length of distribution pipes.

An object of the present invention is to provide an inclination angle of a distributor that can minimize the flow noise of the refrigerant.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

The present invention can reduce the noise of the refrigerant by disposing a connection kit between the buried pipe and the pipe of the indoor unit having different pipe diameters.

According to the present invention, the noise caused by the two-phase flow of the refrigerant can be minimized by disposing a connection kit between the buried pipe and the pipe of the indoor unit having different pipe diameters.

The present invention can minimize the resistance of the refrigerant by disposing a connection kit between the buried pipe and the pipe of the indoor unit having different pipe diameters.

The present invention relates to an electronic expansion valve disposed in an outdoor unit and configured to expand a refrigerant by adjusting an opening amount according to an applied current value; a buried pipe installed to be embedded in a building and supplied with the refrigerant expanded by the electronic expansion valve; an indoor heat exchanger disposed in the indoor unit and configured to exchange heat between indoor air and the expanded refrigerant; a first distributor for distributing the refrigerant supplied from the buried pipe; a second distributor for receiving and merging the refrigerant distributed to the first distributor and providing the merged refrigerant to the indoor heat exchanger; and the first distributor and the second A connection kit comprising a plurality of distribution pipes connecting the distributors; including, the diameter (D3) of the first distributor being larger than the diameter (D0) of the buried pipe, and the diameter (D5) of each distribution pipe is formed to be smaller than the pipe diameter D0 of the buried pipe, and the expanded refrigerant flows from the first distributor toward the second distributor.

Since the expanded refrigerant flows to the first distributor having a larger diameter than the buried pipe and then passes through each distribution pipe having a smaller diameter than the buried pipe, noise caused by the flow of the expanded refrigerant can be minimized.

A first connecting pipe having one end connected to the buried pipe and the other end connected to the first distributor;

The pipe diameter D1 of the first connection pipe is smaller than the pipe diameter D0 of the buried pipe, and is larger than the pipe diameter D5 of the distribution pipe.

A volume inside the first distributor is greater than a volume inside the second distributor.

The second distributor further includes a conical body connected to each of the distribution pipes, a pointed portion of the conical body is disposed in the traveling direction of the refrigerant, and the conical body forms a predetermined inclination angle (A), the The inclination angle may be 20 to 60 degrees.

The length of each distribution pipe may be 50 mm to 110 mm.

The pipe diameter D5 of the distribution pipe may be 1 mm.

The second distributor may further include a second conical body formed to be pointed, and the second conical body may face the indoor heat exchanger.

The first distributor may further include a first conical body formed to be pointed, and the first conical body may face the buried pipe.

a first connecting pipe having one end connected to the buried pipe and the other end connected to the first distributor; and a second connection pipe having one end connected to the second distributor and the other end connected to the refrigerant pipe of the indoor heat exchanger, wherein the diameter D5 of each distribution pipe is connected to the first connection pipe and the second pipe. It can be formed to be smaller than the diameters (D1) and (D2) of the connecting pipe.

The pipe diameter D5 of the distribution pipe may be 1 mm.

The length of the distribution pipe may be 50 mm to 110 mm.

The second distributor may include a conical body connected to each of the distribution pipes; and a connecting body protruding from the conical body toward the second connecting tube and coupled to the second connecting tube, wherein the conical body may be sharply formed toward the second connecting tube.

The conical body forms a predetermined inclination angle A based on the central axis C2 of the second distributor, and the inclination angle may be 20 to 60 degrees.

The distribution tube may be at least three.

The first distributor further includes a first conical body formed to be pointed, and the second distributor further includes a second conical body formed to be pointed, the pointed portion of the first conical body and the pointed portion of the second conical body. The parts may face in opposite directions to each other.

The distributor of the air conditioner according to the present invention has one or more of the following effects.

First, in the present invention, since the expanded refrigerant flows to the first distributor having a larger diameter than the buried pipe and then passes through each distribution pipe having a smaller diameter than the buried pipe, noise caused by the flow of the expanded two-phase refrigerant is minimized can do.

Second, in the present invention, since the two-phase refrigerant passes through a plurality of distributors, the noise caused by the two-phase flow of the refrigerant can be minimized.

Third, the present invention is a two-phase refrigerant because the second conical body of the second distributor disposed on the discharge side is disposed to face the second connection pipe, and the inclination angle (A) of the second conical body is 20 to 60 degrees. Resistance and noise generated during the merging process can be minimized.

Fourth, in the present invention, since the length of each distribution pipe is formed to be 50 mm or more, it is possible to minimize the noise caused by the two-phase flow of the refrigerant.

Fifth, in the present invention, since the volume inside the first distributor disposed on the suction side is formed to be larger than the volume of the second distributor, it is possible to minimize noise caused by the inflow of the expanded two-phase refrigerant.

1 is a block diagram of an air conditioner according to a first embodiment of the present invention.
2 is a perspective view of a connection kit according to an embodiment of the present invention.
3 is a plan view of FIG. 2 .
4 is a diagram showing the refrigerant flowing from the buried pipe to the first connection pipe.
5 is a diagram showing the refrigerant flowing through the distribution pipe.
6 is a graph of measuring refrigerant noise after the electronic expansion valve.
7 is a graph showing the performance ratio and power consumption ratio before/after application of the connection kit according to the present embodiment.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an air conditioner according to a first embodiment of the present invention.

The air conditioner according to the present embodiment includes an outdoor unit (1) and an indoor unit (2), a first buried pipe (3) connecting the outdoor unit (1) and the indoor unit (2), and the outdoor unit (1) and the indoor unit (2) ) and a second buried pipe (4) for connecting them.

The outdoor unit 1 according to the present embodiment includes a compressor 10 for compressing a refrigerant, an outdoor heat exchanger 11 for receiving and condensing refrigerant supplied from the compressor 10, and expanding the liquid refrigerant condensed in the condensing heat exchanger. an electromagnetic expansion valve 50 to control the compressor, an accumulator 14 for supplying only gaseous refrigerant to the compressor 10 after receiving the refrigerant discharged from the indoor unit 2, and a control unit 20 for controlling the compressor 10 ) and an outdoor blowing fan 15 for blowing air to the outdoor heat exchanger 11 .

The indoor unit (2) includes an indoor heat exchanger (13) for evaporating the refrigerant expanded through the electronic expansion valve (50), and an indoor blowing fan (16) for flowing air to the indoor heat exchanger (13). .

The electronic expansion valve 50 (EEV) may adjust the opening amount according to the applied current value.

As the compressor 10, an inverter compressor capable of adjusting the operating frequency is used.

In the air conditioner, an indoor unit detecting unit and an outdoor unit detecting unit are installed to control the compressor 10 .

The control unit 20 may control the compressor 10 or the electronic expansion valve 50 through the temperature, humidity, refrigerant pressure, refrigerant temperature, etc. sensed by the indoor unit or outdoor unit sensing unit.

The indoor unit detection unit may include an indoor temperature sensor for detecting the indoor temperature, an evaporative heat exchanger temperature sensor for detecting the temperature of the evaporative heat exchanger, and an evaporative refrigerant pressure sensor for detecting the refrigerant pressure of the evaporative heat exchanger.

The outdoor unit detection unit may include an outdoor temperature sensor for detecting the outdoor temperature, a condensation heat exchanger temperature sensor for detecting the temperature of the condensation heat exchanger, and a condensing refrigerant pressure sensor for detecting the refrigerant pressure of the condensation heat exchanger.

The air conditioner may install a separate pressure sensor and a temperature sensor in an indoor pipe or an outdoor pipe in order to sense the temperature of the refrigerant.

Meanwhile, the indoor heat exchanger 13 receives the refrigerant expanded from the electronic expansion valve 50 , and the supplied refrigerant exchanges heat with indoor air.

The first buried pipe 3 and the second buried pipe 4 are installed in an indoor structure. For example, the structure may be inside a wall of a room.

In this embodiment, the diameter or diameter of each pipe through which the refrigerant flows means the inner diameter.

In this embodiment, the diameter of the first buried pipe 3 may be referred to as a first diameter, and the length of the first diameter may be 9.52 mm. A pipe diameter of the second buried pipe 4 is referred to as a second pipe diameter, and may be the same size as the first pipe diameter.

The first buried pipe (3) is disposed between the electromagnetic expansion valve (50) and the indoor heat exchanger (13). The electromagnetic expansion valve (50) and the first buried pipe (3) are connected through a first outdoor engine (101).

The second buried pipe (4) is disposed between the accumulator (14) and the indoor heat exchanger (13). The second buried pipe (4) and the accumulator (14) are connected through a second outdoor engine (102).

In the present embodiment, the refrigerant at a higher pressure than that of the second buried pipe 4 flows through the first buried pipe 3 .

In this embodiment, although the first and second diameters are the same, the second diameter flows through a low-pressure refrigerant, so unlike this embodiment, the first diameter is larger and the second diameter is smaller. can be

Each end of the first buried pipe 3 and the second buried pipe 4 is located in an outdoor unit room (not shown) of the building. The other ends of the first buried pipe 3 and the second buried pipe 4 are located inside the building in which the indoor unit 2 is installed.

The air conditioner according to the present embodiment further includes a connection kit 200 for connecting the indoor heat exchanger 13 and the first buried pipe 3 .

One end of the connection kit 200 is connected to the first buried pipe 3 , and the other end is connected to the indoor heat exchanger 13 . The connection kit 200 reduces the noise of the refrigerant flowing from the first buried pipe 3 to the indoor heat exchanger 13 .

Hereinafter, the structure of the connection kit 200 will be described in more detail with reference to FIG. 2 or FIG. 3 .

2 is a perspective view of a connection kit according to an embodiment of the present invention, and FIG. 3 is a plan view of FIG. 2 .

The connection kit 200 includes a first distributor 210 for distributing the refrigerant supplied from the first buried pipe 3, and a second distributor 210 for receiving and joining the refrigerant distributed to the first distributor 210 ( 220), a first connection pipe 201 having one end connected to the first buried pipe 3, the other end connected to the first distributor 210, and one end connected to the second distributor 220 and a second connection pipe 202 having the other end connected to the indoor heat exchanger 13, and a plurality of distribution pipes 230 connecting the first distributor 210 and the second distributor 220. .

The connection kit 200 is used in the form of an assembly. That is, the installer connects the connection kit 200 in the form of an assembly to the first buried pipe 3 and the indoor heat exchanger 13 .

The second connection pipe 202 may be welded to the refrigerant pipe on the side of the indoor heat exchanger 13 . The installer welds the first connecting pipe 201 to the first buried pipe 3 , thereby completing the installation of the connecting kit 200 . The connection kit 200 may be accommodated inside the indoor unit.

Since the connection kit 200 is in the form of an assembly, the installation time of the installer can be minimized.

The pipe diameter D1 of the first connecting pipe 201 is smaller than the pipe diameter of the first embedded pipe 3 . In this embodiment, the pipe diameter of the first connecting pipe 201 is 6.35 mm, and the pipe diameter of the first embedded pipe 3 is 9.52 mm. In this embodiment, the length of the first connector 201 is 100 mm.

The diameter D2 of the second connection pipe 202 is 6.35 mm, which is the same as the diameter D1 of the first connection pipe 201 . In this embodiment, the length of the second connector 202 is 100 mm.

It is preferable that the pipe diameters D1 and D2 of the first connecting pipe 201 and the second connecting pipe 202 are the same as the refrigerant pipe diameters of the indoor unit 2 or the outdoor unit 1 .

One end 201a of the first connecting pipe 201 is connected to the first buried pipe 3 .

Since the diameter of the first buried pipe 3 is larger than that of the first connecting pipe 201 , the end 201a is expanded. That is, one end of the first connecting pipe 201 extends from 6.35 mm to 9.52 mm, and is connected to the first buried pipe 3 .

The other end 201b of the first connector 201 is coupled to one side of the first distributor 210 . In this embodiment, the other end 201b of the first connector 201 is inserted into the first distributor 210 and coupled thereto.

One end 202a of the second connector 202 is coupled to the other end of the second distributor 220 . In the present embodiment, the other end 202b of the second connector 202 is inserted into the second distributor 220 .

The other end 202b of the second connection pipe 202 is coupled to the refrigerant pipe 13a of the indoor heat exchanger 13 . The other end 202b of the second connection pipe 202 may be welded to the refrigerant pipe 13a of the indoor heat exchanger 13 .

The first distributor 210 is disposed between the distribution pipe 230 and the first connection pipe 201 .

The first distributor 210 is formed of a copper material.

The first distributor 210 includes a cylindrical body 212 to which the distribution pipe 230 is connected, a space is formed therein, and the cylindrical body 212 and is integrally formed with the cylindrical body 212 . a conical body 214 positioned on the side of the first connector 201 and communicating with the inner space of the cylindrical body 212, and the conical body 214 protrudes toward the first connector 201 and a connecting body 216 coupled to the first connecting pipe 201 .

The cylindrical body 212, the conical body 214 and the connecting body 216 are made of copper and are integrally manufactured.

The first connector 201 is disposed on the central axis C1 of the first distributor 210 .

The connecting body 216 is formed in a cylindrical shape, and is formed to be equal to or larger than the outer diameter of the first connecting pipe 201 . The first connecting pipe 201 is inserted into the connecting body 216 .

The refrigerant supplied to the first connection pipe 201 flows to the distribution pipe 230 through the conical body 214 and the cylindrical body 212 .

In this embodiment, the diameter D3 of the cylindrical body 212 is 25 mm, and the largest diameter D3 of the conical body 214 is 25 mm.

The other side 210a of the cylindrical body 212 is closed, and the distribution pipe 230 is inserted into the other side 210a. One side of the cylindrical body 212 communicates with the inside of the conical body 214 .

One end of the connecting body 216 communicates with the first connecting pipe 201 , and the other end communicates with the inside of the conical body 214 .

The conical body 214 has a pointed shape in the direction of the connection body 216 . The conical body 214 has a wide cross-section on the side of the distribution pipe 230 and a narrow cross-section on the side of the connection body 216 .

The conical body 214 forms a predetermined inclination angle B with respect to the central axis C1. The inclination angle B of the conical body 214 is greater than the inclination angle A of the second distributor 220 to be described later. The inclination angle B is an angle between the inclined surfaces 214a and 214b on both sides of the conical body 214 .

The volume of the inner space of the first distributor 210 is formed to be larger than the volume of the inner space of the second distributor 220 . The first distributor 210 provides an expanded space for the refrigerant supplied from the first connection pipe 201 .

The refrigerant introduced into the first distributor 210 through the first connection pipe 201 may reduce the two-phase (gas, liquid) noise of the refrigerant through a pressure drop.

In particular, the refrigerant (gas, liquid) expanded to the electronic expansion valve 50 is supplied to the first distributor 210 .

A plurality of distribution pipes 230 are disposed, and in this embodiment, a first distribution pipe 231 , a second distribution pipe 232 , and a third distribution pipe 233 are provided. The first distribution pipe 231 , the second distribution pipe 232 , and the third distribution pipe 233 are arranged at equal intervals.

The length of the first distribution pipe 231, the second distribution pipe 232, and the third distribution pipe 233 is 50 mm or more, and 110 mm in this embodiment.

The first distribution pipe 231 , the second distribution pipe 232 , and the third distribution pipe 233 may be capillary tubes. The refrigerant may expand again while passing through the first distribution pipe 231 , the second distribution pipe 232 , and the third distribution pipe 233 .

Since one end and the other end of the first distribution pipe 231 , the second distribution pipe 232 , and the third distribution pipe 233 are inserted into the first distributor 210 and the second distributor 220 , the outside The exposed length of the first distribution pipe 231 , the second distribution pipe 232 , and the third distribution pipe 233 is 90 mm.

Each of the inner diameters of the first distribution pipe 231 , the second distribution pipe 232 , and the third distribution pipe 233 is smaller than the inner diameters of the first connection pipe 201 and the second connection pipe 202 . .

In this embodiment, the inner diameter of the first distribution pipe 231 , the second distribution pipe 232 , and the third distribution pipe 233 is 1 mm.

The second distributor 220 is formed of a brass material.

The second distributor 220 includes a conical body 222 connected to the distribution pipe 230, and a connection body 224 protruding from the conical body 222 toward the second connection pipe 202. . When it is necessary to distinguish the conical body of the first distributor 210 and the conical body of the second distributor 220, the conical body of the first distributor 210 is called a first conical body, and the second distributor 220 ) is called the second conical body.

Similarly, the connection body 216 of the first distributor 210 is called a first connection body 216 , and the connection body 224 of the second distributor 220 is called a second connection body 224 .

The first connection body 216 and the second connection body 224 are disposed to face each other in opposite directions. That is, the narrow side cross-section of the first connection body 216 faces the first connection pipe 201 , and the narrow side cross-section of the second connection body 224 faces the second connection pipe 202 .

And the wide side surfaces of the first connection body 216 and the second connection body 224 are disposed to face each other.

The first distributor 210 is an inlet side through which the refrigerant flows, and the second distributor 220 is a discharge side through which the refrigerant is discharged.

The connection body 216 of the first distributor 210 is disposed to face the first connection pipe 201 and is coupled to the first connection pipe 201 . The connection body 224 of the second distributor 220 is disposed to face the second connection pipe 202 and is coupled to the second connection pipe 202 .

The conical body 222 has a pointed shape in the direction of the connection body 224 .

The conical body 222 has a wide cross-section on the side of the distribution pipe 230 and a narrow cross-section on the side of the connection body 224 . The shape of the conical body 222 is to reduce noise caused by the discharged refrigerant.

The refrigerant passing through the first distribution pipe 231 , the second distribution pipe 232 , and the third distribution pipe 233 flows into the connection body 224 after being merged inside the conical body 222 . .

At this time, the inclined inner surface of the conical body 222 guides the merged refrigerant toward the connection body 224 .

The second connector 202 is disposed on the central axis C2 of the second distributor 220 . The conical body 222 forms a predetermined inclination angle A with respect to the central axis C2 of the second distributor 220 . The inclination angle A is an angle between the inclined surfaces 222a and 222b on both sides of the conical body 222 .

The inclination angle A may be formed at 20 to 60 degrees.

The central axes C1 and C2 of the first distributor 210 and the second distributor 220 may be arranged in a line.

The wide side diameter D4 of the conical body 222 may be formed to be 20.6 mm.

One side (wider side, 220a) of the conical body 222 is closed, and the distribution pipe 230 is inserted therethrough. The other side (narrow side) of the conical body 222 is open and communicates with the connection body 224 .

The other side 210a of the first conical body 214 and the one side 220a of the second conical body 222 are disposed to face each other. The pointed portion of the first conical body 214 and the sharp portion of the second conical body 222 are disposed to face each other.

The wide side diameter (20.6 mm) of the conical body 222 is smaller than the diameter (25 mm) of the cylindrical body 212 .

The connecting body 224 is formed in a cylindrical shape and is manufactured integrally with the conical body 222 . One end of the connecting body 224 communicates with the conical body 222 , and the other end communicates with the second connecting pipe 202 .

When the refrigerant flows from the distribution pipe 230 to the second connection pipe 202 , the expanded refrigerant collides with the inclined surfaces 222a and 222b and is guided toward the connection body 224 . Through the inclination angle (A), it is possible to minimize the noise of the refrigerant.

As the flow direction of the coolant and the inclination angle A decrease, noise caused by the flow of the coolant may be reduced.

The flow state of the refrigerant will be described with reference to FIG. 4 or FIG. 5 .

4 is a diagram showing the refrigerant flowing from the buried pipe to the first connection pipe. 5 is a diagram showing the refrigerant flowing through the distribution pipe.

The electromagnetic expansion valve 50 atomizes the refrigerant. The atomized refrigerant may be in a two-phase state in a gaseous or liquid state.

In order to minimize the plug/slug flow according to the flow of the expanded refrigerant, it is necessary to minimize the change in the inner diameter by connecting a pipe with the same inner diameter.

However, since the buried pipes 3 and 4 cannot be replaced because they are installed in the building, they must be installed even if the pipe diameters of the buried pipes 3 and 4 are different from the pipe diameters of the indoor unit or the outdoor unit.

In this embodiment, a connection kit 200 for minimizing noise generation when connecting a pipe diameter smaller than the pipe diameter of the buried pipes 3 and 4 is installed.

The figure shown in FIG. 4 shows the state of the refrigerant when the refrigerant flows from the first buried pipe 3 to the first connection pipe 201 .

When the refrigerant flows from the first buried pipe 3 with a large inner diameter to the first connection pipe 201 with a small inner diameter, noise may be generated as the bubbles of the plug/slug flow are broken during the refrigerant flow process in the two-phase state. .

5 is a diagram illustrating a refrigerant flow inside a plurality of distribution pipes 230 .

When the refrigerant flows to the distribution pipe 230 through the first distributor 210 as in the present embodiment, the distribution pipe 230 suppresses the plug/slug flow from being generated inside.

In this embodiment, the refrigerant that has passed through the electronic expansion valve 50 flows in the order of "first distributor 210 -> distribution pipe 230 -> second distributor 220" of the connection kit 200 .

Unlike this embodiment, when the refrigerant that has passed through the electronic expansion valve 50 flows in the order of "second distributor 220 -> distribution pipe 230 -> first distributor 210" of the connection kit 200 , it is difficult to effectively reduce the flow noise of the refrigerant.

Because the discharged refrigerant collides with the inner surface of the conical body 214 of the first distributor 210 and is discharged to the narrow connection body 216, noise due to the slug/plug is generated.

Unlike the present embodiment, when the refrigerant flows in the order of "second distributor 220 -> distribution pipe 230 -> first distributor 210", a noise such as the sound of water is continuously generated.

Also, even when a silencer having the same structure as in the prior art 1 is connected, irregular water sounds are continuously generated.

Unlike the present embodiment, when the buried pipe 3 with a large pipe diameter and the refrigerant pipe of the indoor heat exchanger with a small pipe diameter are directly connected without the connection kit 200, intermittent and irregular noise is generated.

6 is a graph of measuring refrigerant noise after the electronic expansion valve.

A graph in the case of directly connecting the buried pipe 3 with a large pipe diameter and the refrigerant pipe of the indoor heat exchanger with a small pipe diameter without the connection kit 200 is indicated by the red buried pipe solid line in FIG. 7 . In the case of a structure without a connection kit, it can be seen that irregular noise is generated in the 2-4Hz section.

A connection kit 200 installed as in this embodiment is indicated by a green solid line.

If the buried pipe and the indoor heat exchanger refrigerant pipe have the same diameter and are connected through a socket, it is indicated by a solid blue line.

As can be seen from the graph, when the buried pipe and the indoor heat exchanger refrigerant pipe have the same pipe diameter, it can be confirmed that noise generation is minimized.

When the connection kit 200 having the same structure as the present embodiment is installed, the noise is greater than that of the same pipe diameter, but it can be confirmed that the noise is smaller than the structure without the connection kit 200 .

7 is a graph showing the performance ratio and power consumption ratio before/after application of the connection kit according to the present embodiment.

It can be seen that the air conditioner in which the connection kit 200 of the present invention is installed has slightly lower performance and a slight increase in power consumption than the air conditioner in which the connection kit 200 is not installed.

The test conditions in Figure 7 are,

Standard: indoor 27/19 degree, outdoor 35/24 degree;

Low temperature: indoor 21/15 degrees, outdoor 21/15 degrees,

Overload: Indoor 32/23, outdoor 48/29 degrees.

As shown in the graph, under the above conditions, performance decreases by -1.3% to 0.5%, and power consumption increases by 0.6% to 1.8%.

Although the connection kit 200 is disadvantageous in performance and power consumption, it is possible to improve customer satisfaction by reducing noise directly generated indoors.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above embodiments, but may be manufactured in various different forms, and those of ordinary skill in the art to which the present invention pertains. It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

200: connection kit 201: first connection pipe
202: second connector 210: first distributor
220: second distributor 230: distribution pipe
231: first distribution pipe 232: second distribution pipe
233: third distribution pipe

Claims (15)

an electronic expansion valve disposed in the outdoor unit and configured to expand the refrigerant by adjusting the opening amount according to the applied current value;
a buried pipe installed to be embedded in a building and supplied with the refrigerant expanded by the electronic expansion valve;
an indoor heat exchanger disposed in the indoor unit and configured to exchange heat between indoor air and the expanded refrigerant;
a first distributor for distributing the refrigerant supplied from the buried pipe; a second distributor for receiving and joining the refrigerant distributed to the first distributor and providing the merged refrigerant to the indoor heat exchanger; A connection kit including a plurality of distribution pipes connecting the distributors, a first connection pipe connecting the first distributor and the buried pipe, and a second connection pipe connecting the second distributor and the indoor heat exchanger do,
The first distributor,
a cylindrical body to which the distribution pipe is connected and a space is formed therein;
a first conical body communicating with the inner space of the cylindrical body and protruding toward the first connecting pipe; and
and a first connecting body connecting the first conical body and the first connecting pipe,
The second distributor,
a second conical body connected to the distribution pipe; and
and a second connecting body connecting the second conical body and the second connecting pipe,
The diameter (D3) of the first distributor is formed to be larger than the diameter (D0) of the buried pipe, and the diameter (D5) of each distribution pipe is formed to be smaller than the diameter (D0) of the buried pipe,
the expanded refrigerant flows from the first distributor towards the second distributor;
A volume inside the first distributor is greater than a volume inside the second distributor,
The inclination angle (B) formed by the inclined surface of the first conical body is larger than the inclination angle (A) formed by the inclined surface of the second conical body,
The diameter of the widest part of the second conical body is formed smaller than the diameter of the cylindrical body,
The distribution pipe is a capillary tube of the air conditioner. The method according to claim 1,
The pipe diameter (D1) of the first connection pipe is smaller than the pipe diameter (D0) of the buried pipe, and is larger than the pipe diameter (D5) of the distribution pipe. delete The method according to claim 1,
The sharp part of the second conical body is disposed in the flow direction of the refrigerant, and the inclination angle (A) formed by the inclined surface of the second conical body is 20 to 60 degrees. The method according to claim 1,
An air conditioner having a length of 50 mm to 110 mm of each of the distribution pipes. The method according to claim 1,
An air conditioner having a diameter (D5) of the distribution pipe of 1 mm. The method according to claim 1,
An air conditioner in which the second conical body faces the indoor heat exchanger. 8. The method of claim 7,
The first conical body of the air conditioner faces the buried pipe. The method according to claim 1,
An air conditioner in which the diameter (D5) of each distribution pipe is formed smaller than the diameters (D1) and (D2) of the first and second connection pipes. 10. The method of claim 9,
An air conditioner having a diameter (D5) of the distribution pipe of 1 mm. 10. The method of claim 9,
An air conditioner having a length of 50 mm to 110 mm of the distribution pipe. 10. The method of claim 9,
The second connection body protrudes from the second conical body toward the second connection tube, and is coupled to the second connection tube,
The second conical body of the air conditioner is formed to be pointed toward the second connecting pipe. 13. The method of claim 12,
The inclination angle (A) formed by the inclined surface of the second conical body with respect to the central axis (C2) of the second distributor is 20 to 60 degrees. The method according to claim 1,
The air conditioner has at least three distribution pipes. The method according to claim 1,
An air conditioner in which a pointed portion of the first conical body and a pointed portion of the second conical body face in opposite directions.

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