JP3433865B2 - Air conditioner - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner separated into an indoor unit and an outdoor unit, and particularly to work at the time of installation and workability such as repair and inspection of equipment. The present invention relates to an air conditioner that has improved air quality. 2. Description of the Related Art Conventionally, this type of air conditioner requires electric wiring work and refrigerant piping work for connecting the two units by electric wiring and refrigerant piping when the indoor unit and outdoor unit are installed. is necessary. [0003] Especially in electrical work, if there is incorrect wiring, the equipment may be damaged, so it is necessary to provide a protection device in the air conditioner. Therefore, in recent years, an electronic protection system mainly composed of a microcomputer or the like has been incorporated into one of an indoor unit and an external unit. Some control systems prevent operation of the air conditioner, display erroneous wiring, and enable operation when erroneous wiring is corrected to normal wiring. [0005] However, this electronic protection system is expensive, and is necessary only for wiring work for indoor and outdoor units, and is unnecessary for the original function of the air conditioner thereafter. Therefore, it is mounted only on high-end models. An important condition is that the air conditioner is inexpensive from the maker's side, and from the installation contractor's side, it is required that the air conditioner be returned in a short time during operation. For this reason, a method of providing a simple and inexpensive fuse in a wiring circuit and detecting an erroneous wiring by fusing the fuse has been generally employed in the models whose cost is focused on. [0008] However, if the fuse is blown due to incorrect wiring, the temporary wiring work is interrupted,
You must search for a fuse that meets the specifications of the fuse, and obtain it again.
After this, the suspended wiring work must be restarted. For this reason, the workability of wiring work is not always good, and there is a problem that the cost increases. In view of the above, in the related art, a spare fuse is provided in the air conditioner in advance, but this increases the cost for the spare fuse. In another example of the air conditioner, a two-way valve of a bypass is opened by a temperature switch for detecting the temperature of the compressor, and a part of the liquid refrigerant circulating in the refrigeration cycle is passed through the bypass in the compressor. To protect it from overheating. At the time of installation of this type of air conditioner, repair and inspection of equipment, and the like, there are cases where a test is performed to determine whether or not the two-way valve operates reliably. When checking the operation of the two-way valve by raising it,
The confirmation test requires a relatively long time and is complicated, and the workability is reduced. There is also a method in which the temperature switch is electrically short-circuited and the two-way valve is operated to check the temperature. But,
In this case, since the temperature switch is usually housed in the terminal box of the compressor for dust prevention or the like, when the temperature switch is forcibly short-circuited, the terminal box must be opened, which is extremely complicated. It takes a long time to work. It is an object of the present invention to provide a simple and efficient low-cost operation such as wiring work for connection between indoor and outdoor equipment, installation work such as an operation check test of a two-way valve and the like, and repair inspection of equipment. An object of the present invention is to provide an air conditioner that can be performed in an efficient manner. Means for Solving the Problems The invention according to claim 1 is as follows.
In an air conditioner having a fuse that blows when wiring is incorrectly connected to electrically connect an indoor unit and an outdoor unit,
Comprising a pair of relay terminals connected in parallel to both terminals of the fuse, and a short-circuit line connected between said pair of relay terminals when shorting the fuse, the short circuit wire
Has one end connected to one relay terminal at all times.
, At least the other end is detachably connected to the other relay terminal
It is configured to be . Here, the term "short-circuiting between both terminals of the fuse" means that the fuse is blown due to miswiring at the time of installation of an indoor unit or an external unit. It is time to continue the subsequent installation work. In the air conditioner according to the first aspect of the present invention, the fuse blows when the wiring wired when the indoor unit and the outdoor unit are installed is incorrect. Therefore, the wiring operator can confirm that the wiring is incorrect wiring, and can correct the incorrect wiring immediately. Subsequent work can be continued after a short-circuit wire is connected between the pair of relay terminals to make an emergency recovery. Therefore, not only an expensive electronic control system for countermeasures for incorrect wiring but also a spare fuse is unnecessary.
Cost can be reduced. In addition, it is possible to save the trouble of searching for or obtaining a fuse having the same specification as the blown fuse, and it is not necessary to interrupt the wiring work due to the blown fuse, so that the work can be continued. Can be. Further, since one end of the short-circuit line is always connected to one of the relay terminals and is provided in advance, it is possible to prevent the short-circuit line from being lost, and a wiring worker or the like holds the short-circuit line in advance. No need. Also, since at least one end of the short-circuit line can be detachably connected to the relay terminal,
The connection can be made easily and quickly. Embodiments of the present invention will be described below with reference to FIGS. 1 to 10. 1 to 10, the same or corresponding parts are denoted by the same reference numerals. FIG. 2 shows an example of a refrigeration cycle of an air conditioner to which the present invention is applied. In this figure, an air conditioner 1 has a compressor 2 driven by an inverter (not shown) so as to be able to control the rotation speed. , A four-way valve 3, an indoor heat exchanger 5 having an indoor fan 4, an outdoor heat exchanger 8 having an expansion valve 6, and an outdoor fan 7 are connected in order in this order and annularly by a refrigerant pipe 9 so that the refrigerant is reversible. A refrigeration cycle that circulates the water is constituted. In this refrigeration cycle, when the indoor and outside fans 4 and 7 are operated, the refrigerant is circulated in the direction of the solid line arrow by the switching operation of the four-way valve 3 to perform the heating operation, and is circulated in the direction of the broken line arrow in the diagram. Cooling operation. A bypass passage 10 connects the discharge port side of the compressor 2 to a middle of a refrigerant flow path connecting the outdoor heat exchanger 8 and the expansion valve 6, and is interposed in the middle of the bypass passage 10. Capillary tube 11 and two-way valve 12
Are provided. Therefore, during the cooling operation, the two-way valve 12
By opening the valve, a part of the liquid refrigerant is
To return to the compressor 2 for cooling to prevent overheating. When the temperature switch 13 for detecting the refrigerant discharge temperature or the comp case temperature of the compressor 2 detects a predetermined temperature or higher, the two-way valve 12 is energized to excite the exciting coil 12a and opens. The indoor fan 4, the indoor heat exchanger 5, and the like are housed in an indoor unit 14 shown in the wiring diagram of FIG. 1, and the compressor 2 and the outdoor fan 7 other than these are housed in an outdoor unit 15. The indoor and outdoor units 14 and 15 each have a pair of wiring connection terminal plates 16 and 17, which include power supply terminals 18, 19, 20 and 21 and signal terminals 22 and 23. A protection fuse 24 is electrically connected in series between the signal circuit of the indoor unit 14 and the signal terminal 22 to prevent damage to the device due to incorrect wiring. When the indoor and outdoor units 14 and 15 are installed,
As shown in FIG. 1, the wiring connection terminal plates 16 and 17 are wired so as to connect the power supply terminals 18 and 20, 19 and 21 and the signal terminals 22 and 23 with the same numbers in the figure, respectively. Then, as shown in FIG.
Fuse terminals 24 electrically connecting both ends of the
a and 24b are connected in parallel with a pair of relay terminals 25a and 25b, and between one of the relay terminals 25a and the common terminal 26 commonly connected to one of the fuse terminals 24a and one of the relay terminals 25a. Is the lead wire 2 which is a short circuit for emergency
7 is always connected. As shown in FIG. 4, the connection terminals 27a and 27b at both ends of the lead wire 27 are detachably electrically connected to the pair of relay terminals 25a and 25b or the common terminal 26, respectively. It is composed. The lead wire 27 may be provided, for example, on a printed circuit board 28 on which the fuse 24 is mounted as shown in FIG. 5 or in the vicinity thereof, or may be provided near a fuse holder 29 as shown in FIG. . Also, the fuse 24 on the printed circuit board 28
Is formed, a printed circuit board 28 is formed as shown in FIG.
A narrowed portion 30a for narrowing the pattern width is formed in a part of the conductive path pattern 30 formed thereon, and this is
4 may be configured. When the indoor unit 14 and the outdoor unit 15 are installed, if the wiring between the pair of wiring connection terminals 16 and 17 has an incorrect wiring, the fuse 24 is blown and the equipment is damaged. At the same time, the wiring operator can confirm that there is an erroneous wiring. Therefore, the erroneous wiring can be corrected. However, even if the erroneous wiring is corrected, if the fuse 24 is left melted and blown out, the subsequent work cannot proceed, so that one of the adhesive terminals 27b of the lead wire 27 is shared as shown in FIG. It is detached from the terminal 26 and attached to one of the relay terminals 25b. As a result, the state before the fuse 24 is blown can be quickly restored by short-circuiting the fuse 24, so that the subsequent operation can be continued without relaying. Therefore, even if the fuse 24 is blown due to erroneous wiring between the indoor and outdoor units 14 and 15, the connection of one terminal 27b of the lead wire 27 is changed from the common terminal 26 to simply one relay terminal 25b. As a result, the work can be immediately and immediately restored, so that the workability of the installation work of the air conditioner can be improved. Further, in this embodiment, since a pair of inexpensive relay terminals 25a and 25b and an inexpensive lead wire 27 having a simple structure are simply newly provided, an increase in cost can be suppressed. FIG. 9 is a schematic wiring diagram of the indoor and outdoor units 14 and 15 showing a second embodiment of the present invention, and FIG. 10 is a schematic exploded view of the outdoor unit 15. By connecting the first power supply terminal 20 of the wiring connection terminal plate 17 to the relay terminal 32 by the lead wire 31 which is a short-circuit line, the temperature switch 13 is short-circuited to excite the excitation coil 12a of the two-way valve 12, It is characterized in that the direction valve 12 is opened so that the opening operation can be confirmed. As shown in FIG. 9, an empty terminal of an electromagnetic switch 33 is used as the relay terminal 32, and the exciting coil 12a of the two-way valve 12 and one end of the temperature switch 13 are connected to the relay terminal 33. To the R terminal of the electromagnetic switch 33 to which the other end of the switch 13 is connected, the first power supply terminal 20 (also shown as a circle 1 in FIG. 9) of the wiring connection terminal plate 17 is connected. The electromagnetic switch 33 and the wiring connection terminal plate 17
Is housed in an electric component box 34 as shown in FIG. 10, and the temperature switch 13 is built in a terminal box 35 on the head of the compressor 2. In FIG. 10, reference numeral 34a denotes an openable / closable lid of the electronic component box 34, 36 denotes a front panel,
37 is a rear plate. Therefore, according to the present embodiment, the two-way valve 12 is used when installing the indoor and outdoor units 14 and 15 and in repairing and inspecting the equipment.
When performing a test for confirming the valve opening operation of the electronic component box 17, the lid 34a of the electronic component box 17 shown in FIG.
By simply connecting the first power supply terminal 20 of the connection terminal plate 17 and the relay terminal 32 of the electromagnetic switch 33, the temperature switch 13 is short-circuited, and the exciting coil 1 of the two-way valve 12 is
2a is excited to open the valve, and the opening / closing operation can be reliably confirmed. That is, since it is not necessary to heat the temperature switch 13 to the operating temperature and operate it, the operation of opening the two-way valve 12 can be checked simply, quickly and efficiently, and the workability is improved. Can be. As described above, in the air conditioner according to the first aspect of the present invention, the fuse blows when the wiring wired when the indoor unit and the outdoor unit are installed is incorrect. Therefore, the wiring operator can confirm that the wiring is incorrect wiring, and can correct the incorrect wiring immediately. Subsequent work can be continued after a short-circuit wire is connected between the pair of relay terminals to make an emergency recovery. Therefore, not only an expensive electronic control system for countermeasures against erroneous wiring but also a spare fuse are unnecessary.
Cost can be reduced. In addition, it is possible to save the trouble of searching for or obtaining a fuse having the same specification as the blown fuse, and it is not necessary to interrupt the wiring work due to the blown fuse, so that the work can be continued. Can be. Further, since one end of the short-circuit line is always connected to one of the relay terminals and is provided in advance, the short-circuit line can be prevented from being lost, and a wiring worker etc. holds the short-circuit line in advance. No need. Also, since at least one end of the short-circuit line can be detachably connected to the relay terminal,
The connection can be made easily and quickly. [0045]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a wiring diagram of an air conditioner according to a first embodiment of the present invention. FIG. 2 is a refrigeration cycle diagram of a general air conditioner to which the present invention is applied. FIG. 3 is an enlarged wiring diagram of a main part of the embodiment shown in FIG. 1; FIG. 4 is an external perspective view of a part shown in FIG. 3; FIG. 5 is a partial external perspective view of a main part shown in FIG. 4; FIG. 6 is an external perspective view of a part of another modification of the embodiment shown in FIG. 5; FIG. 7 is a partial plan view of still another modification of the embodiment shown in FIG. 5; FIG. 8 is a main part wiring diagram for explaining the operation of the embodiment shown in FIG. 1 and the like. FIG. 9 is a wiring diagram of a second embodiment of the present invention. FIG. 10 is a schematic exploded view of the outdoor unit shown in FIG. 9; [Description of Signs] 1 Air conditioner 2 Compressor 3 Four-way valve 4 Indoor fan 5 Indoor heat exchanger 8 Outdoor fan 10 Bypass path 12 Two-way valve 12a Exciting coil of two-way valve 13 Temperature switch 14 Indoor unit 15 Outdoor unit 16 , 17 Wiring connection terminal plates 18, 19, 20, 21 Power supply terminals 22, 23 Signal terminals 24 Fuses 24a, 24b Fuse terminals 25a, 25b Relay terminals 27, 31 Lead wires (short-circuit wires) 32 Relay terminals 33 Electromagnetic switch 34 Electrical parts box

Continuation of the front page (56) References JP-A-6-42802 (JP, A) JP-A-6-252522 (JP, A) JP-A-5-289718 (JP, A) JP-A-7-308021 (JP) , A) Japanese Utility Model Showa 62-17168 (JP, U) Japanese Utility Model Hei 3-37346 (JP, U) Japanese Utility Model Showa 61-166370 (JP, U) Japanese Utility Model Showa 56-78377 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F24F 11/02 103

Claims (1)

(57) [Claim 1] In an air conditioner having a fuse that is blown when a wiring for electrically connecting an indoor unit and an outdoor unit is erroneously wired, in parallel with both terminals of the fuse. A short-circuit wire connected between the pair of relay terminals when the fuse is short-circuited, and the short-circuit wire has one end connected to the one relay terminal.
While always connected, at least the other end is the other relay end
An air conditioner characterized by being configured to be detachably connected to a child .