KR20020032073A - A defroster and control method for the multi type air-conditioner - Google Patents

Abstract

PURPOSE: A defrosting device of multi-split type air conditioner and driving method of the same are provided to prevent icing on an outdoor heat exchanger not working and to improve efficiency of heat exchange of an outdoor heat exchanger working. CONSTITUTION: A device comprises an icing preventive device and a control device to prevent icing on outdoor heat exchanger when one of indoor units stops during heating operation. The icing preventive device is installed on inlet pipes(53,63) and discharge pipes(54,64) of a first outdoor heat exchanger(57a) and a second outdoor heat exchanger(57b). The control device controls operation of the icing preventive device according as a first indoor unit(70) and a second indoor unit(80) work or not.

Description

Defroster and control method for multi type air conditioner {A defroster and control method for the multi type air-conditioner}

The present invention relates to a multi-type air conditioner, and in particular, when only one operation is performed during heating, a defrosting device is installed to prevent the outdoor heat exchanger from freezing, thereby preventing freezing and improving the heat exchange efficiency of the multi-type air conditioner. It relates to a defrosting device and a method of operating the same.

1 is a block diagram of a multi-type air conditioner according to the prior art.

The conventional multi-type air conditioner is an outdoor unit that heat-exchanges outdoor air with refrigerants circulated in connection with the first and second indoor units 20 and 30 for comfortably exchanging indoor air and the first and second indoor units 20 and 30. It consists of (10).

The first and second indoor chambers 20 and 30 may include first and second air blowers 22 and 32 for forcibly flowing indoor air, and indoor air introduced by the first and second air blowers 22 and 32. First and second indoor heat exchangers 24 and 34 for cooling or heating are included.

The outdoor unit 10 may be configured to cool the high and high pressure refrigerant discharged from the first and second compressors 1 and 11 and the first and second compressors 1 and 11 to compress the refrigerant to high temperature and high pressure. First and second four-way valves 2 and 12 which circulate toward the first and second indoor heat exchangers 24 and 34 when heating to the first and second outdoor heat exchangers 7a and 7b, and the first and second four-way valves. First and second outdoor heat exchangers 7a and 7b for exchanging refrigerant introduced through (2,12) with outdoor air, and the first and second indoor heat exchangers 24 and 34 and the first and second First and second expansion valves 5 and 15 installed inside the outdoor unit 10 to be positioned between the outdoor heat exchangers 7a and 7b to expand the refrigerant into a low temperature and low pressure refrigerant to facilitate heat absorption are included. It is composed.

Referring to the operation of the multi-type air conditioner according to the prior art configured as described above are as follows.

First, the refrigerant is compressed to high temperature and high pressure by the compressors 1 and 11, and the refrigerant compressed by the compressors 1 and 11 passes through the four-way valves 2 and 12 to cool down the outdoor heat exchanger 7a. , 7b) is moved to the indoor heat exchangers 24 and 34 to exchange heat and convert the refrigerant into low-temperature and high-pressure refrigerant.

Subsequently, it is converted into a liquid refrigerant having a low temperature and low pressure while passing through the expansion valves 5 and 15, and when cooled, is moved to an indoor heat exchanger 24 and 34 to cool the heat exchanger 7a and 7b to absorb heat. It is circulated as it flows into the compressors 1 and 11 again.

However, the outdoor heat exchanger (7a, 7b) of the conventional multi-type air conditioner is a refrigerant to the outdoor heat exchanger connected to the other indoor unit when only one of the first and second room (24, 34) is operated alone during the heating operation Since the refrigerant does not circulate due to the low temperature of the outdoor, the heat exchanger may be broken and the outdoor heat exchanger in operation may interfere with the flow of condensate generated during the defrosting operation, thereby lowering the heat exchange efficiency.

The present invention has been made to solve the above-mentioned problems of the prior art, the object of which is to improve the refrigerant circulation structure when only one indoor unit is operated during the heating operation to prevent freezing of the outdoor heat exchanger not operated. In addition, the present invention provides a defrosting apparatus of a multi-type air conditioner capable of improving the heat exchange efficiency of an outdoor heat exchanger in operation.

1 is a block diagram of a multi-type air conditioner according to the prior art,

2 is a block diagram of a multi-type air conditioner according to the present invention;

3 is a block diagram showing the control means of the multi-type air conditioner according to the present invention;

4 is a flowchart illustrating a method of operating a defrosting device of a multi-type air conditioner according to the present invention.

<Explanation of symbols on main parts of the drawings>

51: first compressor 52: first four-way valve

53: suction pipe of the first heat exchanger 54: discharge pipe of the first heat exchanger

55: first expansion valve 57: outdoor heat exchanger

57a: first outdoor heat exchanger 57b: second outdoor heat exchanger

60: outdoor unit 61: second compressor

62: second four-way valve 63: suction pipe of the second heat exchanger

64: discharge pipe of the second indoor heat exchanger 65: second expansion valve

70: first room 72: first room heat exchanger

80: second room 82: second room heat exchanger

90: opening and closing means 91: the first solenoid valve

92: second solenoid valve 93: third solenoid valve

94: fourth solenoid valve 95: fifth solenoid valve

96: sixth solenoid valve 112: first ON / OFF switch

114: second ON / OFF switch 116: control unit

118: first blowing motor 120: second blowing motor

In the defrosting apparatus of the multi-type air conditioner according to the present invention for solving the above problems, the first and second compressors are installed inside the outdoor unit, and the first and second four-way valves are mounted on the discharge port side of the first and second compressors. And first and second outdoor heat exchangers configured to exchange heat with outdoor air while the refrigerant discharged from the first and second four-way valves pass, and are connected to the first and second outdoor heat exchangers to heat exchange indoor air. In the defrosting apparatus of a multi-type air conditioner equipped with an indoor unit, when the heating operation is in progress, the first and second outdoor heat exchangers may be prevented from freezing when the outdoor heat exchanger stops when any one of the first and second indoor units is stopped. Ice preventing means is installed on the suction pipe and the discharge pipe of the machine, and the control means for controlling the operation of the ice prevention means according to the operation of the first and second chambers.

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

2 is a block diagram of a multi-type air conditioner according to the present invention.

The multi-type air conditioner according to the present invention includes first and second rooms 70 and 80 installed in different spaces and an outdoor unit 60 connected to the first and second rooms 70 and 80, respectively.

The first and second indoor chambers 70 and 80 are the first and second air blowers 72 and 82 which suck the indoor air by forced flow and the indoor air sucked by the first and second air blowers 72 and 82. The first and second indoor heat exchangers 74 and 84 for exchanging heat are included.

The outdoor unit 60 is connected to the first and second indoor units 70 and 80, and the outdoor unit 60 includes first and second compressors 51 and 61 for compressing a refrigerant at a high temperature and a high pressure. To cool the high temperature and high pressure refrigerant discharged from the two compressors 51 and 61 to the first and second outdoor heat exchangers 57a and 57b for cooling, and to the first and second room heat exchangers 74 and 84 for heating. First and second four-way valves 52 and 62 and first and second outdoor heat exchangers 57a and 57b for exchanging refrigerant introduced through the first and second four-way valves 52 and 62 with outdoor air. And installed inside the outdoor unit 60 so as to be located between the first and second indoor heat exchangers 74 and 84 and the first and second outdoor heat exchangers 57a and 57b to cool the refrigerant to facilitate heat absorption. And first and second expansion valves 55 and 65 for expanding with a low pressure refrigerant.

In addition, when any one of the first and second chambers 70 and 80 is operated alone during the heating operation, the first and second chambers 70 and 80 to prevent the outdoor heat exchanger connected to the other indoor unit from freezing. And a defrosting device is installed in the outdoor unit (60).

The defrosting apparatus is provided with first and second suction pipes 53 and 63 of the first and second outdoor heat exchangers 57a and 57b to control a circulation direction of the refrigerant flowing to the first and second outdoor heat exchangers 57a and 57b. ) And freezing prevention means installed on the first and second discharge pipes (54, 64), and control means for controlling the operation of the freezing prevention means.

The anti-icing means is provided on the suction pipe 53 and the discharge pipe 54 of the first outdoor heat exchanger 57a to open and close the refrigerant circulation to the first outdoor heat exchanger 57a. (3) and (4) installed on the suction pipe (63) and the discharge pipe (64) of the second outdoor heat exchanger (57b) to open and close the refrigerant circulation to the second outdoor heat exchanger (57b). The first and third solenoid valves 91 and 93 and the first and second outdoor heat exchangers may be shared so that the solenoid valves 93 and 94 and the refrigerant of the first and second outdoor heat exchangers 57a and 57b are shared with each other. The first control pipe 102 interconnecting the first and second suction pipes 53 and 63 between the 57 and 57b and the refrigerant of the first and second outdoor heat exchangers 57a and 57b may be shared with each other. A second control pipe 104 for interconnecting the first and second discharge pipes 54 and 64 between the first and second outdoor heat exchangers 57a and 57b and the second and third solenoid valves 92 and 93. And on the first and second control pipes 102 and 104. It is consists of claim 5, 6 solenoid valves (95,96) for controlling whether the first and second outdoor heat exchanger (57a, 57b) mutually shared between the refrigerant.

The solenoid valve 90 is a valve in which opening and closing operation is performed when power is applied. Here, a solenoid valve 90 of a type that maintains an open state and closes when the power is turned on is installed. .

3 is a block diagram showing the control means of the multi-type air conditioner according to the present invention.

The control means may include first and second ON / OFF switches installed at one side of an outer wall of the first and second rooms 70 and 80 so that the first and second rooms 70 and 80 may start or stop operation. 112 and 114, a control unit 116 which determines whether the icing prevention means is opened or closed based on signals input from the first and second ON / OFF switches 112 and 114, and the first and second units according to signals transmitted from the control unit. The solenoid valve 90 for controlling the refrigerant circulation to the outdoor heat exchangers 57a and 57b and the thermal efficiency of the first and second outdoor heat exchangers 57a and 57b are maximized according to the signal transmitted from the controller 116. The first and second blower motors 118 and 120 may be configured to control the air blowing amount of the first and second indoor units 70 and 80.

Looking at the operation of the present invention configured as described above are as follows.

4 is a flowchart illustrating a method of operating a defrosting device of a multi-type air conditioner according to the present invention.

During the single operation of the first indoor unit 70, the single operation of the second indoor unit 80, and the simultaneous operation of the first and second indoor units 70 and 80, the operation states of the first and second indoor units 70 and 80 are Detecting a driving state; The first and second units may control the refrigerant supplied to the first and second outdoor heat exchangers 57a and 57b according to the operating states of the first and second indoor units 70 and 80 detected in the operation state detecting step. A refrigerant circulation control step of controlling the opening and closing of the solenoid valves 90 provided on the suction pipes and the discharge pipes of the outdoor heat exchangers 57a and 57b; In the refrigerant circulation control step, the first and second chambers 70 and 80 to maximize the heat exchange efficiency of the first and second indoor heat exchangers 74 and 84 according to whether the solenoid valve 90 is opened or closed. The air flow rate control step of controlling the air flow of the.

In the refrigerant circulation control step, the fifth and sixth solenoid valves 95 and 96 are turned on when the first and second indoor units 70 and 80 are simultaneously operated, so that the first and second outdoor heat exchangers 57a and 57b are turned on. The refrigerant supplied to the heat exchanges with each other individually to form a heating.

In addition, when the first indoor unit 70 is in operation alone, the third and fourth solenoid valves 93 and 94 are turned on so that the refrigerant that is heat exchanged with the indoor air in the first indoor heat exchanger 74 is first, By exchanging heat while passing through the two outdoor heat exchangers 57a and 57b, a higher temperature refrigerant is supplied to the first indoor heat exchanger 74 while preventing freezing of the second outdoor heat exchanger 57b.

In addition, when the second indoor unit 82 is in a single operation, the first and second solenoid valves 91 and 92 are turned on, and the refrigerant supplied from the second indoor heat exchanger 84 is converted into the first and second outdoor heat exchangers. By exchanging heat through the groups 57a and 57b, a higher temperature refrigerant is supplied to the second indoor heat exchanger 84 while preventing freezing of the second outdoor heat exchanger 57b.

In the air flow control step, when the fifth and sixth solenoid valves 95 and 96 are turned on, the airflows of the first and second rooms 70 and 80 are maintained at the same reference amount, so that the first and second indoor heat exchangers ( 74, 84) provide effective simultaneous heating.

In addition, when the third and fourth solenoid valves 93 and 94 are turned on, the first and second outdoor heat exchangers 57a and 57b are operated by increasing the amount of air blown out of the first indoor unit 70. The heat exchange efficiency of the first indoor heat exchanger 74 is maximized by effectively exchanging heat with the refrigerant supplied at a higher temperature while passing through).

In addition, when the first and second solenoid valves 91 and 92 are turned on, the air blowing amount of the second indoor unit 80 is further increased to increase the amount of air blown to the first and second outdoor heat exchangers 57a and 57b. Heat exchange effectively with the refrigerant that has reached a higher temperature while passing through) maximizes the heating efficiency of the second indoor heat exchanger (84).

In the defrosting apparatus of the multi-type air conditioner of the present invention configured as described above, anti-icing means are provided on the suction pipes and the discharge pipes of the first and second outdoor heat exchangers, and a control means for controlling the air is provided, so It is possible to prevent freezing of the outdoor heat exchanger that is not operated and to maximize the heating efficiency of the remaining indoor unit that is operated alone to prevent breakage of the air conditioner and to reduce operating costs.

Claims (6)

The first and second compressors are installed inside the outdoor unit, and the first and second four-way valves are mounted on the discharge port side of the first and second compressors, and the refrigerant discharged from the first and second four-way valves passes through the outdoor air and heat. In the defrosting apparatus of the multi-type air conditioner, the first and second outdoor heat exchanger is provided, the first and second indoor heat exchanger are connected to the first and second outdoor heat exchanger. When the heating operation is in progress, if any one of the first and second indoor unit stops operation, the anti-icing means provided on the suction pipe and the discharge tube of the first and second outdoor heat exchanger to prevent freezing; ; Defroster of the air conditioner, characterized in that the control means for controlling the operation of the frost preventing means in accordance with the operation of the first, second chamber. The method of claim 1, The anti-icing device includes first, second, third and fourth solenoid valves installed on the suction pipes and the discharge pipes of the first and second heat exchangers so as to control the refrigerant flowing into or out of the first and second outdoor heat exchangers. ; A first and a second agent connecting the first suction pipe and the second suction pipe, the first discharge pipe and the second discharge pipe, respectively, so that when one of the first and second chambers is stopped, the refrigerant flowing to the other heat exchanger is shared. Commercial piping; When the first and second chambers are all operated, the first and second outdoor heat exchangers are configured with fifth and sixth solenoid valves installed on the first and second defrost pipes so that they can be heat exchanged individually. A defrosting device of a defrosting device of a multi-type air conditioner. The method of claim 1, The control means may include: first and second on / off switches installed in the first and second rooms so as to detect whether the first and second rooms are operated; Defroster of the defrosting device of the multi-type air conditioner, characterized in that the control unit for determining whether the operation of the frost preventing means by the signal output from the first, second on / off switch. An operation state sensing step of sensing an operation state of the first and second indoor units during a single operation of the first indoor unit, a single operation of the second indoor unit, and simultaneous operation of the first and second indoor units when the heating operation is in progress; Installed on the suction pipe and the discharge pipe of the first and second outdoor heat exchangers so as to control the refrigerant supplied to the first and second outdoor heat exchangers according to the motion state of the first and second indoor rooms detected in the operation state detecting step. A refrigerant circulation control step of controlling opening and closing of the first, second, third, fourth, fifth, and sixth solenoid valves; In the refrigerant circulation control step according to whether the 1,2,3,4,5,6 solenoid valves are opened or closed, the air flow amount control step of controlling the air flow to maximize the heat exchange efficiency of the first and second rooms Defrosting device operation method of a multi-type air conditioner, characterized in that. The method of claim 4, wherein In the refrigerant circulation control step, the fifth and sixth solenoid valves are turned on when the first and second chambers are simultaneously operated, and the third and fourth solenoid valves are turned on when the first indoor unit is operated alone, 2 The method of operating a defrosting device of a multi-type air conditioner, wherein the first and second solenoid valves are turned on when the indoor unit is running alone. The method of claim 4, wherein In the air flow control step, when the fifth and sixth solenoid valves are turned on, the first and second indoor airflows are maintained at the same reference amount, and when the third and fourth solenoid valves are turned on, the first and second airflows of the indoor unit are further increased. The defrosting apparatus of the multi-type air conditioner is operated at an increased amount, and when the first and second solenoid valves are turned on, the air blowing amount of the second indoor unit is operated at an increased amount. How to operate.