JP2009041829A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner capable of maintaining the optimal supercooling operation status. <P>SOLUTION: The air conditioner is composed of an outdoor machine 16 and an indoor machine 22. The outdoor machine 16 comprises a compressor 1, an outdoor heat exchanger 2 having a supercooling pipe 9, an outdoor blower 3, a first electric expansion valve 4, a four-way valve 5, an outdoor heat exchanger temperature detecting means 6, an expansion valve entrance temperature detecting means 14 for detecting entrance temperature of the first electric expansion valve 4, a first electromagnetic valve 12 connected to the supercooling pipe 9, and a bypass circuit 10 for connecting an inlet pipe 8 and an outlet pipe 11 of the supercooling pipe 9 via a second electromagnetic valve 13. The indoor machine 22 comprises an indoor heat exchanger 17, an indoor blower 18, a second electric expansion valve 19, a suction air temperature detecting means 20 for detecting temperature of suction air, and an indoor machine control device 21. The supercooling pipe 9 is bypassed when a supercooling degree is large and used when the supercooling degree is small to maintain the optimal supercooling operation status. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an air conditioner.

  As a conventional air conditioner of this type, there is one as shown in FIG. 4 (see, for example, Patent Document 1).

FIG. 4 is a refrigeration cycle diagram of the conventional air conditioner disclosed in Patent Document 1 in which the heat exchanger 25 of the conventional air conditioner is connected to a header 26 and a distributor 27 independently. The heat exchanger unit 25G is composed of a plurality of heat exchange blocks that perform normal heat exchange, and the supercooling heat exchanger unit 25S that supercools the refrigerant. In the supercooling heat exchanger unit 25S, heat exchange is performed. It is common to have a supercooling tube at the outlet of the vessel 25.
JP 2004-347135 A

  However, in the configuration of the conventional air conditioner described above, when the supercooling pipe of the heat exchanger 25 is configured with a certain length, the refrigerant circulation amount may be small, such as when cooling at a low outside air temperature. There was a problem that the degree of supercooling was too high.

  The present invention solves the above-mentioned conventional problems, and when the degree of supercooling is large, the supercooling pipe is bypassed, and when the degree of supercooling is small, the supercooling pipe is used to achieve optimum supercooling. It aims at providing the air conditioning apparatus which can maintain the driving | running state of.

  In order to solve the above problems, an air conditioner of the present invention includes an outdoor unit and an indoor unit, and the outdoor unit includes a compressor, an outdoor heat exchanger having a supercooling pipe, an outdoor fan, 1 electric expansion valve, four-way valve, outdoor heat exchanger temperature detecting means for detecting the temperature of the outdoor heat exchanger, and expansion valve inlet temperature detection for detecting the inlet temperature of the first electric expansion valve Means, a first solenoid valve connected to the supercooling pipe, a bypass circuit connecting the inlet pipe and the outlet pipe of the supercooling pipe via a second solenoid valve, and the outside air detecting the outside air temperature Temperature detecting means, and the indoor unit includes an indoor heat exchanger, an indoor blower, a second electric expansion valve, an intake air temperature detecting means for detecting the temperature of the intake air, an indoor unit control device, When the degree of supercooling is large, bypass the supercooling pipe, When the cooling degree is small, it utilizes the subcooling tube, can maintain the operating condition of the optimal supercooling.

  The air conditioner of the present invention can maintain the optimum supercooling operation state by bypassing the supercooling pipe when the degree of supercooling is large and using the supercooling pipe when the degree of supercooling is small. .

1st invention is comprised from the outdoor unit and the indoor unit, and the said outdoor unit is a compressor, the outdoor heat exchanger which has a supercooling pipe | tube, the outdoor air blower, the 1st electric expansion valve, and a four-way valve An outdoor heat exchanger temperature detecting means for detecting the temperature of the outdoor heat exchanger, an expansion valve inlet temperature detecting means for detecting an inlet temperature of the first electric expansion valve, and the supercooling pipe. The indoor unit comprising: a first electromagnetic valve; a bypass circuit connecting the inlet pipe and the outlet pipe of the supercooling pipe through a second electromagnetic valve; and an outside air temperature detecting means for detecting outside air temperature. Is equipped with an indoor heat exchanger, an indoor blower, a second electric expansion valve, an intake air temperature detecting means for detecting the temperature of the intake air, and an indoor unit control device, when the degree of supercooling is large Bypasses the supercooling pipe, and if the degree of supercooling is small, It utilizes a can maintain the operating conditions of the optimal supercooling.

  In particular, the second invention has a predetermined supercooling set value for determining the degree of supercooling degree for each outside air temperature of the first invention, and the optimum supercooling operation under all outside air temperature conditions. The state can be maintained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
FIG. 1 is a refrigeration cycle diagram of the air-conditioning apparatus according to the first embodiment of the present invention, and FIG. 2 is a flowchart showing an operation control method of the air-conditioning apparatus.

  In FIG. 1, the air conditioner in this Embodiment is comprised from the outdoor unit 16 and the indoor unit 22, and the outdoor unit 16 is the outdoor heat exchanger 2 which comprised the compressor 1 and the subcooling pipe | tube 9 in the lowest stage. An outdoor blower 3, a first electric expansion valve 4 that can be decompressed, a four-way valve 5 that switches between a cooling operation and a heating operation, and an outdoor heat exchanger temperature detection means 6 that detects the temperature of the outdoor heat exchanger 2. And an expansion valve inlet temperature detecting means 14 for detecting the inlet temperature of the first electric expansion valve 4, an outside air temperature detecting means 7 for detecting the outside air temperature, an inlet pipe 8 and a supercooling pipe 9 for the supercooling pipe 9. A bypass circuit 10 in which the outlet pipe 11 is connected via a second electromagnetic valve 13, a first electromagnetic valve 12 disposed in the inlet pipe 8 of the supercooling pipe 9, and an outdoor unit control device 15. The indoor unit 22 includes an indoor heat exchanger 17, an indoor blower 18, and a second electric power that can be decompressed. And wherein the expansion valve 19, the suction air temperature detecting means 20, and a indoor unit control device 21.

  In FIG. 2, during the cooling operation, first, the second electromagnetic valve 13 is turned OFF, and at the same time, the first electromagnetic valve 12 is turned ON, and the operation is performed in the refrigeration cycle using the supercooling pipe 9. Next, the outdoor heat exchanger temperature Te1 detected by the outdoor heat exchanger temperature detecting means 6 and the expansion valve inlet temperature Te2 detected by the expansion valve inlet temperature detecting means 14 are compared by the outdoor unit control device 15, and a predetermined value is determined. If Te1-Te2> S is satisfied with respect to the supercooling degree set value S, the second electromagnetic valve 13 is turned on and the first electromagnetic valve 12 is turned off simultaneously, that is, the supercooling pipe 9 is bypassed. .

  As described above, according to the present embodiment, when the degree of supercooling is large, the supercooling pipe 9 is bypassed, and when the degree of supercooling is small, the supercooling pipe 9 is used to optimize the degree. It is possible to maintain a supercooling operation state.

(Embodiment 2)
FIG. 3 is a flowchart showing an operation control method for the air-conditioning apparatus according to the second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

In the present embodiment, as shown in FIG. 3, during the cooling operation, first, the second electromagnetic valve 13 is turned off and the first electromagnetic valve 12 is turned on at the same time, and the operation is performed in the refrigeration cycle using the supercooling pipe 9. Do. Next, the outside air temperature detecting means 7 detects the outside air temperature Ta, the outdoor heat exchanger temperature Te1 detected by the outdoor heat exchanger temperature detecting means 6, and the expansion valve inlet temperature Te2 detected by the expansion valve inlet temperature detecting means 14. Is compared with the predetermined subcooling degree setting value Sn (n is any one of 1 to 4) in Table 1 determined for each outside air temperature Ta detected by the outside air temperature detecting means 7.
If Te1-Te2> Sn is established, the second electromagnetic valve 13 is turned on and the first electromagnetic valve 12 is turned off simultaneously, that is, the supercooling pipe 9 is bypassed.

  By these operations, it is possible to maintain an optimal supercooling operation state under any outside air temperature conditions.

  In the above-described embodiment, an air conditioner including a pair of indoor units and an outdoor unit has been described as an example. However, the present invention is also applicable to a multi-room type air conditioner including a plurality of indoor units and one outdoor unit. Needless to say, what you can do.

  As described above, the air conditioner according to the present invention can maintain an optimal supercooling operation state, and is not limited to an air conditioner composed of a pair of indoor units and outdoor units. The present invention can also be applied to a multi-room type air conditioner composed of a plurality of indoor units and one outdoor unit.

Refrigeration cycle diagram of the air-conditioning apparatus according to the first embodiment of the present invention The flowchart which shows the operation control method of the air conditioning apparatus The flowchart which shows the operation control method of the air conditioning apparatus in the 2nd Embodiment of this invention. Refrigeration cycle diagram of a conventional air conditioner

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 2 Outdoor heat exchanger 3 Outdoor blower 4 First electric expansion valve 5 Four-way valve 6 Outdoor heat exchanger temperature detection means 7 Outside air temperature detection means 8 Inlet pipe 9 Subcooling pipe 10 Bypass circuit 11 Outlet pipe 12 First 1 solenoid valve 13 second solenoid valve 14 expansion valve inlet temperature detection means 15 outdoor unit control device 16 outdoor unit 17 indoor heat exchanger 18 indoor blower 19 second electric expansion valve 20 indoor unit intake air temperature detection means 21 Indoor unit controller 22 Indoor unit

Claims (2)

The outdoor unit includes an outdoor unit and an indoor unit. The outdoor unit includes a compressor, an outdoor heat exchanger having a supercooling pipe, an outdoor blower, a first electric expansion valve, a four-way valve, and the outdoor heat exchange. Outdoor heat exchanger temperature detecting means for detecting the temperature of the heater, expansion valve inlet temperature detecting means for detecting the inlet temperature of the first electric expansion valve, and first electromagnetic valve connected to the supercooling pipe A bypass circuit for connecting the inlet pipe and the outlet pipe of the supercooling pipe via a second solenoid valve, and an outside air temperature detecting means for detecting the outside air temperature, wherein the indoor unit is an indoor heat exchanger And an indoor air blower, a second electric expansion valve, an intake air temperature detecting means for detecting the temperature of the intake air, and an indoor unit control device. When the degree of supercooling is large, When bypassing and the degree of supercooling is small, use the supercooling pipe. An air conditioning apparatus characterized by. The air conditioner according to claim 1, wherein a predetermined supercooling set value for determining the degree of supercooling is given for each outside air temperature.