WO2023209807A1

WO2023209807A1 - Air conditioner

Info

Publication number: WO2023209807A1
Application number: PCT/JP2022/018890
Authority: WO
Inventors: 浩樹 ▲高▼橋; 博昭小畑; 祐治本村; 良輔松井
Original assignee: 三菱電機株式会社
Priority date: 2022-04-26
Filing date: 2022-04-26
Publication date: 2023-11-02

Abstract

This air conditioner is provided with: a refrigerant circuit in which a compressor, an outdoor heat exchanger, an expansion unit, and an indoor heat exchanger are connected by piping; and a control box for controlling operation of the compressor. The control box comprises a box body constituting an outer shell, and a clamp that has a proximal end part attached to an inner wall of the box body and an elastic flexible part connected to the proximal end part and urged to the inner wall side of the box body to form a space between itself and the inner wall of the box body for passing wiring therethrough. The elastic flexible part has elasticity that causes said part to bend about the proximal end part in the direction away from the inner wall of the box body, thereby creating a gap for insertion of wiring between a distal end and the inner wall of the box body and allowing the wiring to be inserted into the space.

Description

air conditioner

The present disclosure relates to an air conditioner including a control box having a clamp through which wiring is passed.

Conventionally, air conditioners are known that include a control box that has a clamp through which wires are passed. Patent Document 1 discloses a cable clamp that is inserted into a groove-shaped region formed in a housing. The cable clamp is an elastic member that has a cross-sectional area larger than the cross-sectional area of the groove-like region, has a cut along the longitudinal direction, and the cut is enlarged toward the back side. In Patent Document 1, when a cable is attached, the cable is pushed into the notch, the cable clamp is elastically deformed, the notch is enlarged, and the cable is elastically inserted into the hollow part at the back of the notch.

Publication number 60-192607

However, in the cable clamp disclosed in Patent Document 1, the cable must be pushed into the notch when the cable is attached to the cable clamp. Therefore, a great deal of force is required when the cable is attached.

The present disclosure has been made to solve the above-mentioned problems, and provides an air conditioner that does not require a great deal of force when attaching a cable.

An air conditioner according to the present disclosure includes a refrigerant circuit to which a compressor, an outdoor heat exchanger, an expansion section, and an indoor heat exchanger are connected via piping, and a control box that controls the operation of the compressor. The wiring is passed between the box that forms the outer shell, the base end that is attached to the inner wall of the box, and the inner wall of the box that is connected to the base end and is biased toward the inner wall of the box. By bending away from the inner wall of the box body around the base end, a gap is created between the tip and the inner wall of the box body, and the wire is inserted into the space. and a flexible portion having elasticity.

According to the present disclosure, the wiring is inserted into the gap created by the flexible portion bending in a direction away from the inner wall of the individual about the base end portion as an axis. This allows the wiring to pass through the space. In this way, the wiring can be passed through the space with one touch simply by bending the flexible portion. Therefore, no great force is required when the cable is attached.

1 is a circuit diagram showing an air conditioner according to Embodiment 1. FIG. 1 is a perspective view showing a control box according to Embodiment 1. FIG. FIG. 3 is an enlarged view showing a part of the control box according to the first embodiment. 1 is a perspective view showing a control box according to Embodiment 1. FIG. 1 is a perspective view showing a clamp according to Embodiment 1. FIG. FIG. 3 is a side view showing the operation of the clamp according to the first embodiment. FIG. 2 is a perspective view showing a conventional control box. FIG. 3 is a perspective view showing mounting holes formed in a conventional control box. FIG. 2 is a perspective view showing a conventional control box. FIG. 2 is an enlarged view showing wiring in a conventional control box. FIG. 3 is an enlarged view showing a control box according to Embodiment 2. FIG. FIG. 3 is a perspective view showing a clamp according to a second embodiment. FIG. 2 is a perspective view showing a conventional control box.

Hereinafter, embodiments of the air conditioner of the present disclosure will be described with reference to the drawings. Note that the present disclosure is not limited to the embodiments described below. Further, in the following drawings, including FIG. 1, the size relationship of each component may differ from the actual one. In addition, in the following description, terms indicating directions are used as appropriate to facilitate understanding of the present disclosure, but these terms are for the purpose of explaining the present disclosure, and these terms do not limit the present disclosure. isn't it. Examples of terms representing directions include "top", "bottom", "right", "left", "front", and "back".

Embodiment 1.
FIG. 1 is a circuit diagram showing an air conditioner 1 according to the first embodiment. The air conditioner 1 is a device that adjusts the air in a space to be air-conditioned, and includes an outdoor unit 2 and an indoor unit 3, as shown in FIG. The outdoor unit 2 is provided with, for example, a compressor 6, a flow path switching device 7, an outdoor heat exchanger 8, an outdoor blower 9, an expansion section 10, and a control box 13. The indoor unit 3 is provided with, for example, an indoor heat exchanger 11 and an indoor blower 12.

A refrigerant circuit 4 is constructed by connecting a compressor 6, a flow path switching device 7, an outdoor heat exchanger 8, an expansion section 10, and an indoor heat exchanger 11 through a refrigerant pipe 5. The compressor 6 takes in refrigerant at low temperature and low pressure, compresses the sucked refrigerant, and discharges the refrigerant at high temperature and high pressure. The compressor 6 is, for example, an inverter compressor whose capacity can be controlled. The flow path switching device 7 switches the direction in which the refrigerant flows in the refrigerant circuit 4, and is, for example, a four-way valve. The outdoor heat exchanger 8 exchanges heat between, for example, outdoor air and a refrigerant. The outdoor heat exchanger 8 acts as a condenser during cooling operation, and acts as an evaporator during heating operation. The expansion section 10 is a pressure reducing valve or an expansion valve that reduces the pressure of the refrigerant and expands it. The expansion section 10 is, for example, an electronic expansion valve whose opening degree is adjusted.

The indoor heat exchanger 11 exchanges heat between, for example, indoor air and a refrigerant. The indoor heat exchanger 11 acts as an evaporator during cooling operation, and acts as a condenser during heating operation. The indoor blower 12 is a device that sends indoor air to the indoor heat exchanger 11.

(operation mode, cooling operation)
Next, the operation mode of the air conditioner 1 will be explained. First, the cooling operation will be explained. In the cooling operation, the refrigerant sucked into the compressor 6 is compressed by the compressor 6 and discharged in a high temperature and high pressure gas state. The high temperature and high pressure gaseous refrigerant discharged from the compressor 6 passes through the flow path switching device 7 and flows into the outdoor heat exchanger 8 which acts as a condenser. It exchanges heat with the outdoor air sent by 9, condenses and liquefies. The condensed liquid refrigerant flows into the expansion section 10, where it is expanded and depressurized to become a low-temperature, low-pressure gas-liquid two-phase refrigerant. The gas-liquid two-phase refrigerant then flows into the indoor heat exchanger 11 that acts as an evaporator, where it exchanges heat with the indoor air sent by the indoor blower 12, evaporates, and gasifies. do. At this time, indoor air is cooled and cooling is performed indoors. The evaporated low-temperature, low-pressure gaseous refrigerant passes through the flow path switching device 7 and is sucked into the compressor 6 .

(operation mode, heating operation)
Next, heating operation will be explained. In the heating operation, the refrigerant sucked into the compressor 6 is compressed by the compressor 6 and discharged in a high temperature and high pressure gas state. The high temperature and high pressure gaseous refrigerant discharged from the compressor 6 passes through the flow path switching device 7 and flows into the indoor heat exchanger 11 which acts as a condenser. It exchanges heat with indoor air sent by 12, condenses and liquefies. At this time, indoor air is warmed and heating is performed indoors. The condensed liquid refrigerant flows into the expansion section 10, where it is expanded and depressurized to become a low-temperature, low-pressure gas-liquid two-phase refrigerant. The gas-liquid two-phase refrigerant then flows into the outdoor heat exchanger 8 that acts as an evaporator, where it exchanges heat with the outdoor air sent by the outdoor blower 9 and evaporates into gas. do. The evaporated low-temperature, low-pressure gaseous refrigerant passes through the flow path switching device 7 and is sucked into the compressor 6 .

Note that the air conditioner 1 does not need to include the flow path switching device 7. In this case, the air conditioner 1 becomes a cooling-only machine or a heating-only machine.

(control box 13)
FIG. 2 is a perspective view showing the control box 13 according to the first embodiment. Next, the control box 13 will be explained in detail. The control box 13 controls the operation of the compressor 6 and the like. In addition, in this Embodiment 1, the case where the control box 13 is provided in the outdoor unit 2 is illustrated. However, the control box 13 is not limited to the outdoor unit 2, but may be provided in the indoor unit 3, or may be provided in an external device (not shown). Moreover, the control box 13 may be provided in any plurality of the outdoor unit 2, the indoor unit 3, and external equipment. As shown in FIG. 2, the control box 13 includes a box body 20, a control board 22, a spacer 23, wiring 24, a ferrite core 25, an electrical component 26, and a clamp 30.

(Box body 20)
The box body 20 has a substantially rectangular parallelepiped shape with a part of its bottom protruding, and the front side, which has the largest area, is open. Inside the box 20, a control board 22, a spacer 23, wiring 24, a ferrite core 25, an electrical component 26, and a clamp 30 are housed. A metal plate 21 having an L-shaped cross section is attached to both sides of the box 20, and the metal plate 21 fixes the box 20 to the inner surface of the outdoor unit 2. A mounting groove 20a to which the clamp 30 is mounted is formed on the back surface of the box body 20 (see FIG. 5).

(control board 22)
The control board 22 is a plate-shaped member attached along the back surface of the box body 20. A plurality of electrical components 26 are mounted on the control board 22. The control board 22 includes a control board that is a CPU (Central Processing Unit, also referred to as a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, or a processor) that executes a program stored in dedicated hardware or a storage device. The device is implemented. If the control device is dedicated hardware, the control device may be, for example, a single circuit, a composite circuit, an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a combination of these. do. Each of the functional units realized by the control device may be implemented using separate hardware, or each functional unit may be implemented using a single piece of hardware.

When the control device is a CPU, each function executed by the control device is realized by software, firmware, or a combination of software and firmware. Software and firmware are written as programs and stored in storage devices. The CPU implements each function by reading and executing programs stored in a storage device. Note that some of the functions of the control device may be realized by dedicated hardware, and some of them may be realized by software or firmware. The storage device may be configured as a hard disk or a volatile storage device such as random access memory (RAM) that can temporarily store data. Further, the storage device may be configured as a nonvolatile storage device such as a flash memory that can store data for a long period of time.

(Spacer 23)
The spacer 23 is a member that is attached along the back surface of the box body 20 and extends in the width direction to support the control board 22. The spacer 23 is made of resin, for example.

(Wiring 24)
The wiring 24 is a plurality of cables, and is used to connect the control board 22 and each electrical component 26, or to connect an external power source (not shown) to the control board 22. The wiring 24 is held in a bundle inside the box 20 along the inner wall 13a.

(Ferrite core 25)
The ferrite core 25 is a member that has a function of suppressing the propagation of noise current, and is attached to the wiring 24.

(Electrical parts 26)
The electrical components 26 are capacitors, coils, resistors, and the like, and are mounted on the control board 22 or connected to each other via wiring 24.

(Clamp 30)
FIG. 3 is an enlarged view showing a part of the control box 13 according to the first embodiment, and FIG. 4 is a perspective view showing the control box 13 according to the first embodiment. The clamp 30 holds down the wiring 24 and the like so that it does not get in the way inside the box. The clamp 30 is made of resin, for example, but may also be made of elastic metal such as a plate spring. As shown in FIGS. 3 and 4, a plurality of clamps 30 are attached along the side surface of the box body 20 to which the metal plate 21 is attached. In FIG. 3, the clamp 30 holds down not only the wiring 24 but also the ferrite core 25.

FIG. 5 is a perspective view showing the clamp 30 according to the first embodiment. As shown in FIG. 5, the clamp 30 is a long member bent or formed into an arc shape. The clamp 30 is attached to the inner wall 13a of the box body 20, and has a base end portion 31, a flexible portion 34, and a hook portion 35. The base end portion 31 is attached to the inner wall 13a of the box body 20, and has an extending portion 32 and a bent portion 33.

(Proximal end portion 31, extension portion 32)
The extending portion 32 of the base end portion 31 is a rectangular member extending along the inner wall 13a of the box body 20. The extending portion 32 connects the flexible portion 34 and the hook portion 35.

(Base end portion 31, bent portion 33)
The bent portion 33 of the base end portion 31 is a rectangular member extending along the inner wall 13a of the box body 20. The bent portion 33 extends from the opposite side of the extending portion 32 from the flexible portion 34, and is bent at a right angle along a corner of the inner wall 13a of the box body 20. In this way, the extending portion 32 and the bent portion 33 form an L-shape. A vertically protruding protrusion 36 is provided on the distal end side of the bent portion 33 . The base end 31 is fixed to the box 20 by fitting the protrusion 36 into the attachment groove 20a formed on the back surface of the box 20.

(Flexible part 34)
The flexible portion 34 is an arcuate member with a space 34a formed inside. In the first embodiment, the flexible portion 34 has a semicircular cross section as an example of an arc shape, but it may have another arc shape or a polygonal shape. Between the flexible portion 34 and the inner wall 13a of the box body 20 is a space 34a through which the wiring 24 is passed. The flexible portion 34 is normally biased toward the inner wall 13a of the box body 20.

FIG. 6 is a side view showing the operation of the clamp 30 according to the first embodiment. The flexible portion 34 is, for example, an arc-shaped elastic member connected to the extension portion 32 of the base end portion 31 . As shown in FIG. 6, by bending the flexible portion 34 in a direction away from the inner wall 13a of the box body 20 about the boundary 34c between the proximal end portion 31 and the extension portion 32, the tip of the flexible portion 34 and A gap 34b is created between the inner wall 13a of the box body 20 and the wiring 24 inserted therein. In this state, the wiring 24 is inserted through the gap 34b and reaches the space 34a (white arrow in FIG. 6). When the bending of the flexible part 34 is released, the flexible part 34 returns to the inner wall 13a side of the box body 20 due to its own biasing force, and thereby the tip of the flexible part 34 and the inner wall 13a of the box body 20 are connected. The gap 34b between them is closed. Therefore, the wiring 24 passed through the space 34a is prevented from coming off.

(Hook part 35)
The hook portion 35 is a rectangular plate-like member that protrudes from the flexible portion 34 and onto which a finger can be hooked. The hook portion 35 projects from slightly above the center of the semicircular flexible portion 34 in a direction away from the inner wall 13a of the box body 20. As shown in FIG. 6, when the operator hooks his or her finger on the hook part 35 and pulls it in a direction away from the inner wall 13a of the box body 20, the flexible part 34 is succumbed to its own biasing force and the inner wall of the box body 20 It bends in the direction away from 13a. This creates a gap 34b between the tip of the flexible portion 34 and the inner wall 13a of the box body 20, into which the wiring 24 is inserted. In this state, when the operator releases his finger from the hook portion 35, the bending of the flexible portion 34 is released, and the flexible portion 34 returns to the inner wall 13a side of the box body 20 by its own biasing force.

According to the first embodiment, the wiring 24 is inserted into the gap 34b created when the flexible portion 34 is bent in a direction away from the inner wall 13a of the individual with the base end portion 31 as an axis. Thereby, the wiring 24 is passed through the space 34a. In this way, the wiring 24 can be passed through the space 34a with one touch only by bending the flexible portion 34. Therefore, no great force is required when the cable is attached. Thereby, the wiring 24 and the like can be easily arranged on the wall side of the box body 20. That is, the workability of the wiring 24 is good.

Furthermore, the clamp 30 further includes a hook portion 35 that protrudes from the flexible portion 34 and onto which a finger can be hooked. Therefore, the wiring 24 can be passed through the space 34a with only a weak force such as by hooking a finger on the hook portion 35. Furthermore, the flexible portion 34 has an arcuate shape with a space 34a formed therein. Therefore, since the impact when bent is softer than in the case of a polygonal shape, it is less likely to be damaged. Further, since the flexible portion 34 has an arc shape, the flexible portion 34 can be easily bent with a finger.

Furthermore, if the clamp 30 is made of resin, there is no need to weld the clamp 30 to the box body 20. Therefore, there is no need for welding costs. The extending portion 32 and the bent portion 33 of the proximal end portion 31 of the clamp 30 form an L-shape and are along the corners of the box body 20, so that the strength of the box body 20 can be improved. can. Therefore, reinforcement such as increasing the thickness of the box body 20 and forming ribs is not necessary, so that processing costs can be reduced.

7 is a perspective view showing a conventional control box 113, and FIG. 8 is a perspective view showing a mounting hole 113a formed in the conventional control box 113. FIG. 9 is a perspective view showing a conventional control box 113. As shown in FIG. 7, a conventional clamp 230 that brings the wiring 24 close to the inner wall 13a of the box body 20 is attached to the inner wall 13a using a mounting hole 113a shown in FIG. If the control box 113 is installed in a location where it is exposed to condensed water, it is necessary to cover the mounting hole 113a with a heat insulating material 114 or the like, as shown in FIG. 9, to prevent water from entering. arise. On the other hand, the clamp 30 of the first embodiment is attached to the box body 20 by inserting the protrusion 36 into the attachment groove 20a, so the attachment hole 113a is unnecessary and the heat insulating material 114 is also unnecessary. . Therefore, material costs and processing costs can be reduced.

FIG. 10 is an enlarged view showing the wiring 24 in the conventional control box 13. As shown in FIG. 10, conventionally, in addition to the clamp 30 provided on the side surface of the box 20, a second clamp 330 is provided on the back surface of the box 20. The wiring 24 is passed through the inside of the second clamp 330 and is gathered near the inner wall 13a of the box body 20. In the box body 20, it is necessary to secure a space S for providing the second clamp 330. In the first embodiment, since the second clamp 330 is not required, the space S for providing the second clamp 330 is also not required. Therefore, since the control board 22 can be moved closer to the side of the control box 13, the control box 13 can be made smaller.

Embodiment 2.
FIG. 11 is an enlarged view showing the control box 13 according to the second embodiment. The second embodiment differs from the first embodiment in that the clamp 130 and the spacer 23 are integrated. In the second embodiment, parts common to those in the first embodiment are given the same reference numerals and explanations are omitted, and differences from the first embodiment will be mainly explained.

As shown in FIG. 11, in the second embodiment, the spacer 23 that supports the control board 22 and the clamp 130 are integrated. Specifically, the tip of the bent portion 33 of the base end 31 of the clamp 130 and the end of the spacer 23 are connected and integrated.

FIG. 12 is a perspective view showing the clamp 130 according to the second embodiment. As shown in FIG. 12, a connecting portion 131 is provided at the tip of the bent portion 33 of the base end portion 31 of the clamp 130. As shown in FIG. The connecting portion 131 is a pin-shaped member that protrudes in a direction different from the direction in which the protruding portion 36 of the bent portion 33 protrudes. By fixing the connecting portion 131 to the end of the spacer 23, the clamp 130 and the spacer 23 are integrated.

According to the second embodiment, the clamp 130 and the spacer 23 are integrated. Therefore, the mounting hole 113a of the box body 20 formed when fixing the spacer 23 is unnecessary. Therefore, processing costs can be reduced.

FIG. 13 is a perspective view of a conventional control box. As shown in FIG. 13, conventionally, the clamp 230 and the spacer 23 are separate bodies. In this case, in order to attach the spacer 23, it is necessary to form an attachment hole 113a in the box body 20. In contrast, in the second embodiment, since the clamp 130 and the spacer 23 are integrated, the mounting hole 113a of the box body 20 formed when fixing the spacer 23 is unnecessary. Therefore, processing costs can be reduced.

1 Air conditioner, 2 Outdoor unit, 3 Indoor unit, 4 Refrigerant circuit, 5 Refrigerant piping, 6 Compressor, 7 Flow path switching device, 8 Outdoor heat exchanger, 9 Outdoor blower, 10 Expansion section, 11 Indoor heat exchanger , 12 indoor blower, 13 control box, 13a inner wall, 20 box body, 20a mounting groove, 21 sheet metal, 22 control board, 23 spacer, 24 wiring, 25 ferrite core, 26 electrical components, 30 clamp, 31 base end, 32 Extending part, 33 Bending part, 34 Flexible part, 34a Space, 34b Gap, 34c Boundary, 35 Hooking part, 36 Projecting part, 113 Control box, 113a Mounting hole, 114 Insulating material, 130 Clamp, 131 Connection part, 230 Clamp, 330 Second Clamp, S Space.

Claims

A refrigerant circuit in which a compressor, an outdoor heat exchanger, an expansion section, and an indoor heat exchanger are connected by piping,
a control box that controls the operation of the compressor;
The control box is
A box body forming the outer shell,
A space is formed in which the wiring is passed between a base end portion attached to the inner wall of the box body and an inner wall of the box body that is connected to the base end portion and is biased toward the inner wall side of the box body. When the wire is bent in a direction away from the inner wall of the box body about the base end, a gap is created between the tip and the inner wall of the box body, and the wire is inserted into the space. an air conditioner, comprising: a clamp having a flexible portion having elasticity;
The clamp is
The air conditioner according to claim 1, further comprising a hook part that protrudes from the flexible part and on which a finger can be hooked.
The air conditioner according to claim 1 or 2, wherein the flexible portion has an arc shape with the space formed inside.
The base end portion is
an extension portion extending along the inner wall of the box;
A bent portion extending from the side opposite to the flexible portion side of the extending portion, bent along a corner of the inner wall of the box body, and extending along the inner wall of the box body. 3. The air conditioner according to any one of 3.
The air conditioner according to claim 1, wherein the clamp is made of resin.
The control box is
a control board that controls the operation of the compressor;
further comprising a spacer attached to the box body and supporting the control board,
The air conditioner according to any one of claims 1 to 5, wherein the clamp and the spacer are integrated.
The air conditioner according to any one of claims 1 to 6, wherein a ferrite core is passed through the space of the clamp.