WO2017038446A1

WO2017038446A1 - Air conditioning device

Info

Publication number: WO2017038446A1
Application number: PCT/JP2016/073867
Authority: WO
Inventors: 晃弘桝谷
Original assignee: 三菱重工業株式会社
Priority date: 2015-08-28
Filing date: 2016-08-16
Publication date: 2017-03-09
Also published as: EP3296649A4; AU2016316086B2; EP3296649A1; JP2017044455A; AU2016316086A1; CN107636393A

Abstract

The purpose of the present invention is to increase superheating of low pressure refrigerant by using heat from operating electric parts without impairing piping layout and maintenance by way of a simple and inexpensive configuration. This air conditioning device (1) comprises a compressor that compresses refrigerant, a reactor (15) that is an electric part that generates heat when operating and that constitutes a controller electric circuit to drive the compressor, and a low pressure refrigerant pipe (25) that supplies the refrigerant to the compressor. The low pressure refrigerant pipe (25) has a heat exchanger section (25c) in which an intermediate portion of the low pressure refrigerant pipe branches into a plurality of (two, for example) round pipe branch pipes (25b) and then converges back into one pipe. The plurality of branch pipes (25b) are disposed near the reactor (15) so as to be able to exchange heat.

Description

Air conditioner

The present invention relates to an air conditioner adapted to increase the degree of superheat of a low pressure refrigerant by utilizing the operation heat of electrical components.

HFO-1234yf refrigerant (2,3,3,3-tetrafluoro-1-propene: commonly known as HFO refrigerant), which is considered promising as a next-generation refrigerant with less concern about ozone layer depletion and global warming, is The high-pressure gas temperature tends to be low, and the degree of superheat of the compressed refrigerant discharged from the compressor tends to be small. For this reason, the refrigerant sucked into the compressor may be in a wet state including the liquid phase, which would impair the reliability of the compressor by the liquid compression.

Therefore, as described in

Patent Documents

1 and 2, a flat portion is provided in a part of the low pressure refrigerant pipe, and an electric component or an electric component box generating operating heat is adjacent to the flat portion to operate the electric component. There are air conditioners that utilize heat to increase the degree of superheat of the low pressure refrigerant to improve its performance.

Further, as described in Patent Document 3, the low-pressure refrigerant pipe is disposed so as to penetrate the reactor that generates high operating heat, thereby increasing the degree of superheat of the low-pressure refrigerant and simultaneously cooling the reactor. There is an air conditioner.

Unexamined-Japanese-Patent No. 2006-214633 JP 2014-122724 A Japanese Utility Model Application Publication No. 1-101184

However, as in

Patent Documents

1 and 2, in the configuration in which the flat portion is provided in a part of the low pressure refrigerant pipe, the manufacturing cost of the low pressure refrigerant pipe is increased by forming the flat portion, and bending of the flat portion Since there is no degree of freedom in the direction, there is a problem that it becomes a restriction on the piping layout.

Further, as in Patent Document 3, when the low-pressure refrigerant pipe is disposed to penetrate an electric component such as a reactor, replacement of the electric component becomes impossible, and the maintenance of the air conditioner is deteriorated. is there.

The present invention has been made in view of such circumstances, and a simple and inexpensive configuration allows the degree of superheat of the low-pressure refrigerant to be utilized by utilizing the operation heat of the electric component without impairing the piping layout property and the maintainability. An object of the present invention is to provide an air conditioner that can be enhanced.

In order to solve the above-mentioned subject, the present invention adopts the following means.
That is, the air conditioner according to the present invention comprises an electric circuit portion of a compressor that compresses a refrigerant and a controller that drives the compressor, an electric component that generates operating heat, and a low pressure refrigerant that supplies the refrigerant to the compressor A heat exchange section in which a pipe and an intermediate portion of the low pressure refrigerant pipe branch into a plurality of circular pipe-like branch pipes and gather again into one, and the heat exchange section is a heat for the electric component It is disposed close together so as to be exchangeable.

According to the air conditioner having the above configuration, the heat exchange section (branch pipe) of the low pressure refrigerant pipe is disposed in proximity to the electric component generating the operation heat so as to be able to exchange heat. The cold heat of the low pressure refrigerant and the operation heat of the electrical component are heat exchanged. Therefore, the heat of operation of the electrical component is utilized to increase the degree of superheat of the low pressure refrigerant, and the heat of operation of the electrical component is cooled.

Since the heat exchange section is composed of a plurality of branch pipes, the area for heat exchange with the surface of the electric component is increased, and the low pressure refrigerant and the electric component can be efficiently heat exchanged. In addition, since the plurality of branch pipes are round pipes, the configuration of the low pressure refrigerant pipe can be simplified and the increase in manufacturing cost of the low pressure refrigerant pipe can be suppressed as compared to the case where flat pipes are used. Moreover, the circular pipe-like branch pipe has a degree of freedom in the bending direction, and is less likely to be a restriction on the piping layout.

In the above configuration, the electric component is fixed so that a predetermined space is interposed between the electric component and a fixed wall surface to which the electric component is fixed, and the heat exchange section is disposed to pass through the space. It is also good.

According to the above configuration, when the electrical component is removed from the fixed wall surface, the heat exchange section is not blocked. For this reason, the removability of an electrical component can be improved and the maintainability of an air conditioning apparatus can be kept favorable.

In the above configuration, the electric component may be provided with a curved outer peripheral surface, and the heat exchange section may be disposed along the outer peripheral surface of the electric component.

According to the above configuration, since the length of the heat exchange section in contact with the surface of the electric component becomes long, the area for heat exchange between the heat exchange section and the surface of the electric component is further increased, and the low pressure refrigerant Can increase the degree of superheat.

In the above configuration, an outer peripheral groove may be formed on the outer peripheral surface of the electric component, and the heat exchange section may be disposed to be fitted to the outer peripheral groove.

According to the above configuration, by fitting the heat exchange section to the outer peripheral groove formed on the outer peripheral surface of the electric component, the outer peripheral surface of the round pipe shaped heat exchange section is planar to the inner peripheral surface of the outer peripheral groove Close to This makes it possible to increase the area of the heat exchange section in heat exchange with the surface of the electrical component and to increase the degree of superheat of the low pressure refrigerant by the operation heat of the electrical component.

In the above configuration, the electric component may be formed so as to be split, a split groove may be formed in the split portion, and the heat exchange section may be disposed to be fitted to the split groove.

According to the above configuration, when the heat exchange section is fitted in the dividing groove of the electric component, the entire outer peripheral surface of the heat exchanging section adheres in a planar manner to the inner peripheral surface of the dividing groove. This makes it possible to maximize the area in which the heat exchange section exchanges heat with the electrical component, and to enhance the superheating effect of the low-pressure refrigerant due to the operating heat of the electrical component.

In addition, by separating the electric component, the coupling between the electric component and the heat exchange section can be released, so that the heat exchange section is not blocked when the electric component is removed from the fixed wall surface. For this reason, the removability of an electrical component can be improved and the maintainability of an air conditioning apparatus can be kept favorable.

In the above configuration, the heat exchange section may be shaped in a loop shape, and a pipe having the loop shape may be disposed close to the electric component in a heat exchange manner.

According to the above configuration, the piping rigidity of the heat exchange section formed in a loop shape is reduced, so that when the electric component is attached to or detached from the fixed wall surface, the top of the heat exchange section can be moved away from the electric component . As a result, the electrical components can be attached and detached without being blocked by the heat exchange section, and the maintainability of the air conditioner can be favorably maintained.

As described above, according to the outdoor unit for an air conditioner according to the present invention, overheating of the low-pressure refrigerant can be achieved by utilizing the operation heat of the electrical component without impairing the piping layout property and the maintenance property by the simple and inexpensive configuration. The degree can be increased.

It is a cross-sectional view of the outdoor unit for air conditioners which concerns on embodiment of this invention. It is a perspective view of reactor vicinity which shows 1st Embodiment of this invention by II arrow line of FIG. FIG. 3 is a longitudinal sectional view taken along the line III-III in FIG. It is a perspective view of reactor vicinity which shows 2nd Embodiment of this invention. FIG. 5 is a longitudinal sectional view taken along the line VV of FIG. 4; It is a perspective view of reactor vicinity which shows 3rd Embodiment of this invention. FIG. 7 is a longitudinal sectional view taken along the line VII-VII in FIG. It is a perspective view of reactor vicinity which shows 4th Embodiment of this invention. FIG. 9 is a perspective view showing a state in which the front end portion of the core shown in FIG. 8 is separated from the main body portion. FIG. 9 is a longitudinal sectional view taken along the line XX in FIG. 8;

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view of an air conditioner according to an embodiment of the present invention. The air conditioner 1 is an outdoor unit connected to an indoor unit installed indoors such as a shop, an office, or a residence and installed outside.

The air conditioner 1 includes a box-shaped case 2. An air outlet 3 is opened at the front of the housing 2, and the back and one side of the housing 2 are opened as

air inlets

4a and 4b. Inside the housing 2, a machine room 6 is installed on one side in the width direction, and a fan 7 is installed on the other side. The machine room 6 incorporates a number of devices including electrical components such as a compressor 8 for compressing a refrigerant such as HFO refrigerant and a reactor 15 described later in detail. The internal space of the case 2 excluding the machine room 6 is a heat exchange room 11.

The fan 7 is an axial fan including a blade 7a, a fan motor 7b for rotationally driving the same, a motor deck 7c, and a bell mouth 7d surrounding the blade 7a and smoothing the shape of the air outlet 3. The fan motor 7 b is supported by the motor deck 7 c and installed in the housing 2. The baffle plate 6a forming the machine room 6 is adjacent to the bell mouth 7d, and the back surface of the baffle plate 6a is curved toward the fan 7.

A heat exchanger 12 is installed in the heat exchange chamber 11 inside the housing 2 along the

air inlets

4a and 4b. The heat exchanger 12 includes a long side 12a facing the air suction port 4a and a short side 12b facing the air suction port 4b, and is formed in a substantially L shape in plan view. The long side 12 a extends along the back of the housing 2 and from the back of the fan 7 to the back of the machine room 6.

When the fan motor 7b of the fan 7 operates, the blades 7a rotate and outside air is taken in from the

air suction ports

4a and 4b on the back and side of the housing 2, and the outside air passes through the heat exchanger 12 (12a and 12b) After heat exchange with the refrigerant flowing inside the heat exchanger 12 is performed, the air is discharged from the air outlet 3 in front of the housing 2.

A reactor 15 (electrical component) is fixed to a baffle plate 6 a (fixed wall surface) constituting the machine room 6. The reactor 15 is a component that constitutes an electric circuit portion of a controller (not shown) that drives the compressor 8 and that generates operating heat when the controller is operated.

First Embodiment
FIG. 2 is a perspective view of the vicinity of the reactor 15 showing the first embodiment of the present invention in the direction of the arrow II in FIG. 1, and FIG. 3 is a longitudinal sectional view along the line III-III in FIG.

The reactor 15 is configured to include a base plate 16, a core (iron core) 17, a coil (winding) 18, terminals 19 and the like, and for example, four corners of the base plate 16 use screws 21 and nuts 22. It is fixed to the baffle plate 6a.

On the other hand, as shown in FIGS. 1 and 2, a low pressure refrigerant pipe 25 for supplying a low pressure refrigerant to the compressor 8 is disposed in the machine chamber 6. The low-pressure refrigerant pipe 25 includes a main pipe 25a and two circular pipe-like branch pipes 25b (pipes) branched from an intermediate portion of the main pipe 25a, and the two low-pressure refrigerant pipes 25b The portion of is the heat exchange section 25c.

The low-pressure refrigerant pipe 25 is connected to an intake port (not shown) of the compressor 8 through a four-way valve (not shown), and supplies refrigerant vaporized in a heat exchanger built in the indoor unit (not shown) to the compressor 8 in the cooling mode. In the heating mode, the refrigerant vaporized in the heat exchanger 12 is supplied to the compressor 8.

As described above, the heat exchange section 25c provided in the middle portion of the low pressure refrigerant pipe 25 branches, for example, two circular pipe-like branch pipes 25b from the main pipe 25a of the low pressure refrigerant pipe 25 to one again. It is the composition made to gather. The branch pipes 25 b are disposed close to the reactor 15 in a heat exchange manner. The number of branch pipes 25b may be three or more.

Specifically, the length of the heat exchange section 25c (the branch pipe 25b) is, for example, about 30 cm, and is shaped in a loop shape that is convex upward in front of the reactor 15. The top portion of the loop shape is formed in a straight line, and the straight portion of the heat exchange section 25c (branch pipe 25b) extends horizontally along the front surface of the reactor 15, and the front surface of the reactor 15 (core 17) In contact with The straight portion is fixed to the front surface of the reactor 15 by, for example, a bracket 27. The bracket 27 is fastened to a fastening boss 17 a provided on the core 17 of the reactor 15 by, for example, a screw 28, and the thermally conductive sealant 30 is filled between the core 17 and the branch pipe 25 b.

In the air conditioner 1 configured as described above, the low-pressure refrigerant vaporized in the heat exchanger 12 or the heat exchanger in the indoor unit passes through the low-pressure refrigerant pipe 25 and the compressor 8 in either the cooling or heating operation mode. Supplied to Since the plurality of branch pipes 25b constituting the heat exchange section 25c of the low-pressure refrigerant pipe 25 are disposed close to the reactor 15 that emits operating heat so as to be able to exchange heat, this heat exchange section 25c (branch The cold of the low pressure refrigerant flowing through the pipe 25b) and the operation heat of the reactor 15 are exchanged. Therefore, the operating heat of the reactor 15 is utilized to increase the degree of superheat of the low pressure refrigerant, and the operating heat of the reactor 15 is cooled.

Since the heat exchange section 25c of the low pressure refrigerant pipe 25 is composed of a plurality of branch pipes 25b, the area for heat exchange with the surface of the reactor 15 is increased, and the low pressure refrigerant and the reactor 15 can be efficiently heat exchanged. .
Further, since the plurality of branch pipes 25b are round pipes, the configuration of the low pressure refrigerant pipe 25 can be simplified and the increase in the manufacturing cost of the low pressure refrigerant pipe 25 can be suppressed as compared with the case where flat pipes are used.
Moreover, the circular pipe-like branch pipe 25b has a degree of freedom in the bending direction, and is less likely to be a restriction on the piping layout.
By filling the heat conductive sealant 30 between the core 17 and the branch pipe 25b, the thermal resistance between the core 17 and the branch pipe 25b is reduced, and heat exchange between both

members

17 and 25b is performed more efficiently. be able to.

Further, the branch pipe 25b is shaped in a loop shape, and the straight portion near the top of the loop shape is brought close to the reactor 15 so as to be able to exchange heat. In this way, the rigidity near the top of the branch pipe 25b is reduced, so that by removing the bracket 27, the vicinity of the loop top of the branch pipe 25b can be moved away from the reactor 15.
Thereby, at the time of the exchange work of the reactor 15, the reactor 15 can be attached or detached without being blocked by the branch pipe 25b (heat exchange section 25c), and the maintainability of the air conditioner 1 can be maintained favorably.
By making at least a part of the main pipe 25a of the low pressure refrigerant pipe 25 a flexible pipe, the branch pipe 25b can be moved more easily, and the maintainability of the air conditioner 1 accompanied by the replacement of the reactor 15 can be further enhanced. It can be improved.

Second Embodiment
FIG. 4 is a perspective view of the vicinity of the reactor 15 showing a second embodiment of the present invention, and FIG. 5 is a longitudinal sectional view taken along the line VV of FIG.

In this embodiment, the reactor 15 is fixed using a screw 21, a nut 22 and a spacer 33 such that a predetermined space S intervenes between the baffle plate 6 a.

On the other hand, in the low-pressure refrigerant pipe 25, as in the first embodiment, for example, two round pipe-like branch pipes 25b are branched from the main pipe 25a, and the heat exchange section 25c is assembled again into one. Is formed. The two branch pipes 25b (heat exchange sections 25c) are disposed to pass through the space S between the reactor 15 and the baffle plate 6a. The width of the space S is set equal to or slightly larger than the outer diameter of the branch pipe 25b.

As shown in FIG. 5, a heat conductive sealant 30 is filled between the reactor 15 (base plate 16) and the baffle plate 6a so as to wrap the branch pipe 25b. Thus, the two branch pipes 25 b are disposed close to the reactor 15 in a heat exchange manner.

According to the above configuration, when the reactor 15 is removed from the baffle plate 6a, the branch pipe 25b (heat exchange section 25c) does not block the reactor. That is, the reactor 15 can be attached and detached without moving the branch pipe 25b. For this reason, the maintainability of the air conditioning apparatus 1 accompanied by the replacement of the reactor 15 can be kept good.

Third Embodiment
FIG. 6 is a perspective view of the vicinity of the reactor 15 showing a third embodiment of the present invention, and FIG. 7 is a longitudinal sectional view taken along the line VII-VII of FIG.

In this embodiment, the outer peripheral surface of the core 17 of the reactor 15 is a curved surface. Further, the height dimension of the core 17 from the base plate 16 is longer than that of the first and second embodiments. Furthermore, on the outer peripheral surface of the core 17, two outer peripheral grooves 17a extending in the horizontal direction are formed. Although the reactor 15 is fixed in a floating state from the baffle plate 6 a using the screws 21, the nuts 22 and the spacer 34, the reactor 15 may be fixed without using the spacer 34.

On the other hand, the heat exchange section 25c provided in the low pressure refrigerant pipe 25 has substantially the same configuration as that of the first and second embodiments, but the two branch pipes 25b are located above the main pipe 25a. After it is extended, it is bent at a right angle to the baffle plate 6a side and then bent at a right angle to the horizontal direction to fit along the curved outer peripheral surface of the core 17 of the reactor 15 and in the outer peripheral groove 17a of the outer peripheral surface of the core 17 It is arranged to match. The branch pipe 25b may be fixed to the core 17 by a bracket or the like.

According to the above configuration, by arranging the branch pipe 25b along the curved outer peripheral surface of the reactor 15 (core 17), the contact length between the branch pipe 25b and the reactor 15 becomes long.
Further, by fitting the branch pipe 25b into the outer peripheral groove 17a formed on the outer peripheral surface of the core 17, the outer peripheral surface of the round pipe-like branch pipe 25b is in close contact with the inner peripheral surface of the outer peripheral groove 17a. Do.
As a result, the area where the branch pipe 25b exchanges heat with the surface of the reactor 15 can be increased, the working heat of the reactor 15 can be used to efficiently increase the degree of superheat of the low pressure refrigerant, and the reactor 15 can be cooled. When the reactor 15 is replaced, the baffle plate 6a can be taken out of the machine with the reactor 15 fixed, and then the reactor 15 can be removed from the baffle plate 6a and replaced.

Fourth Embodiment
8 and 9 are perspective views showing the vicinity of a reactor 15 according to a fourth embodiment of the present invention, and FIG. 10 is a longitudinal sectional view taken along the line XX in FIG.

In this embodiment, the front end portion 17A of the core 17 of the reactor 15 is separable with respect to the main body portion 17B, and the front end portion 17A is detachably fixed to the main body portion 17B by four screws 36. It has become so. As shown in FIG. 10, two split

grooves

17b and 17c are formed on both surfaces of the split portion between the front end portion 17A of the core 17 and the main body portion 17B.

On the other hand, the heat exchange section 25c provided in the low pressure refrigerant pipe 25 has substantially the same configuration as that of the first and second embodiments, and the middle horizontal portion of the two branch pipes 25b is the reactor 15 (core It arrange | positions so that it may fit in the dividing

grooves

17b and 17c of 17). That is, the two branch pipes 25 b are clamped to the split type core 17 of the reactor 15.

According to the above configuration, by fitting the branch pipe 25b into the

split grooves

17b and 17c, the outer peripheral surface of the branch pipe 25b is a surface over the entire circumference of the inner peripheral surface of the

split grooves

17b and 17c. Close to the shape. As a result, the area of the branch pipe 25b (heat exchange section 25c) in heat exchange with the reactor 15 can be maximized, and the superheating effect of the low-pressure refrigerant due to the operation heat of the reactor 15 can be enhanced.

Moreover, by dividing the reactor 15, the connection between the reactor 15 and the branch pipe 25b can be released, and when removing the reactor 15 from the baffle plate 6a, the branch pipe 25b can be easily removed by slightly moving it forward. Therefore, the removability of the reactor 15 can be improved, and the maintainability of the air conditioner 1 can be kept good.

As described above, according to the air conditioner 1 according to each of the above-described embodiments, the low-pressure refrigerant using the operation heat of the reactor 15 without impairing the piping layout property and the maintenance property by the simple and inexpensive configuration. The degree of superheat of the low pressure refrigerant flowing through the pipe 25 can be increased.

The present invention is not limited to only the configurations of the above-described embodiments, and modifications and improvements can be made as appropriate without departing from the scope of the present invention, and such modifications and improvements can be made. The form is also included in the scope of the present invention.
For example, the configurations of the respective embodiments may be combined.
In the above embodiment, the entire amount of low pressure refrigerant passing through the low pressure refrigerant pipe 25 is configured to pass through the branch pipe 25b (heat exchange section 25c), but only a part of the low pressure refrigerant passes through the branch pipe 25b It is also conceivable to
Furthermore, although the present invention is suitable for application to an air conditioner using HFO refrigerant or HFO mixed refrigerant, the present invention can also be applied to an air conditioner using another type of refrigerant.

1 Air conditioner 6 Machine room 6a Baffle plate (fixed wall)
7 Fan 8 Compressor 12 Heat Exchanger 15 Reactor (Electric Parts)
Reference Signs List 16 base plate 17 core 17a outer

circumferential groove

17b, 17c split groove 18 coil 19 terminal 25 low pressure refrigerant pipe 25a main pipe 25b branch pipe (pipe having a loop shape)
25c heat exchange section S space

Claims

A compressor for compressing the refrigerant,
An electrical component that constitutes an electric circuit unit of a controller that drives the compressor and emits operating heat;
A low pressure refrigerant pipe for supplying the refrigerant to the compressor;
And a heat exchange section in which an intermediate portion of the low pressure refrigerant pipe branches into a plurality of circular pipe-like branch pipes and gathers into one again.
The air conditioning apparatus, wherein the heat exchange section is disposed close to the electric component in a heat exchange manner.
The electric component is fixed such that a predetermined space is interposed between the electric component and a fixed wall surface to which the electric component is fixed,
The air conditioning apparatus according to claim 1, wherein the heat exchange section is disposed to pass through the space.
The electrical component has a curved outer peripheral surface,
The air conditioning apparatus according to claim 1, wherein the heat exchange section is disposed along an outer peripheral surface of the electric component.
An outer peripheral groove is formed on an outer peripheral surface of the electric component,
The air conditioning apparatus according to any one of claims 1 to 3, wherein the heat exchange section is disposed to fit in the outer peripheral groove.
The electrical component is formed to be divisible so that a split groove is formed in the split portion,
The air conditioning apparatus according to claim 1, wherein the heat exchange section is disposed to fit in the dividing groove.
The air conditioning apparatus according to any one of claims 1 to 5, wherein the heat exchange section is shaped in a loop shape, and a pipe having the loop shape is disposed close to the electric component in a heat exchange manner.