KR100696712B1 - System and method for protecting compressor of multi air-conditioner - Google Patents

Abstract

The present invention relates to a compressor protection of a package air conditioner by bypassing some of the refrigerant to the compressor in accordance with the operating state and the outdoor temperature conditions of the multi air conditioner. To this end, a plurality of compressors having different compression capacities of refrigerants, a condenser for making the liquid compressed by the plurality of compressors with outdoor air, and a liquid crystal, a capillary tube for reducing the pressure of the liquid refrigerant, and a plurality of indoor units for vaporizing the liquid refrigerant In the multi-air conditioner having a bypass passage for allowing a portion of the refrigerant introduced into the condenser to exchange heat and enter the compressor, opening and closing the bypass passage through a control valve, and surrounding the condenser through a temperature sensor. The outdoor air temperature is detected to control the opening and closing of the bypass passage according to whether the compressor is individually operated and the outdoor air temperature from the temperature sensor. Therefore, by bypassing a part of the refrigerant flowing into the condenser according to the operating condition of the indoor unit and the temperature of the outdoor air in the multi-air conditioner, it is possible to prevent the compressor from being damaged due to the increased number of occurrences of the unprotected refrigerant and the compressor protection due to the high temperature. There is an advantage.

Multi air conditioner, compressor

Description

System and method for protecting compressor of multi air-conditioner

1 is a block diagram showing the configuration of a conventional multi-air conditioner.

Figure 2 is a block diagram showing the configuration of a compressor protection system of a multi-air conditioner according to the present invention.

3 is a block diagram showing a configuration of a multi-air conditioner to which the compressor protection system of FIG. 2 is applied.

4 is a perspective view showing a condenser in which the bypass flow path of FIG. 3 is installed according to the present invention;

5 is a flow chart showing a compressor protection method of a multi-air conditioner system according to the present invention.

6 is a flow chart illustrating a method of protecting a compressor during operation of the small capacity indoor unit of FIG.

(Explanation of symbols for the main parts of the drawing)

100: first compressor 110: second compressor

120: inflow channel 130: discharge channel

200: condenser 210: bypass flow path

220: capillary tube 230: temperature sensor

240: third valve 300: capillary tube

400: first valve 410: second valve

500: first indoor unit 510: second indoor unit

600: common accumulator

The present invention relates to the protection of a compressor of a multi-air conditioner, and more particularly, to a compressor protection of a package air conditioner by bypassing some refrigerants to the compressor according to the operating conditions of the multi-air conditioner and the outdoor temperature conditions. .

In general, the air conditioner is composed of a compressor, an outdoor heat exchanger, a capillary tube, an indoor heat exchanger, and the like to adjust the indoor temperature to a desired level by the heat exchange action of the refrigerant circulating continuously.

The operation of the air conditioner is a refrigerant compressed by the compressor to a state of high temperature and high pressure flows into the condenser through the refrigerant pipe, the liquid is converted into a liquid phase through the capillary tube, the refrigerant at low temperature and low pressure flows into the indoor unit, It absorbs the heat and lowers the room temperature.

Recently, the spread of multi-air conditioners that drive two or more indoor units in homes or offices is expanding. 1 is a view showing the configuration of a conventional multi-air conditioner, two compressors 10 and 12 having different capacities, a condenser 20, two indoor units 50 and 52 having different capacities, and a common accumulator. In the conventional multi-air conditioner, two compressors 10 and 12 having different capacities may be operated either at the same time or at the same time depending on indoor and outdoor load variations. When the air conditioner is operating at the same time, the refrigerant compressed by the compressors 10 and 12 flows into the condenser 20 through the check valves 14 and 16 mounted at the outlets of the compressors 10 and 12 to allow the outside air to flow. Heat exchange with and converts into a liquid refrigerant. The liquid refrigerant flows into the respective indoor units 50 and 52 through the capillary tube 30, the electromagnetic expansion valve 40, and the solenoid valve 42, exchanges heat with the indoor air, and then returns to the common accumulator 60. After entering, it is introduced into the compressors 10 and 12 again.

However, such a conventional multi-air conditioner operates a compressor 12 having a relatively small capacity when only one indoor unit 52 having a small capacity operates, and in the case of a multi-air conditioner using two compressors 10 and 12 under simultaneous operating conditions. Since the capacity distribution between the indoor unit 50 with a relatively large capacity and the indoor unit 52 with a small capacity is designed to be optimal, when only the indoor unit 52 having a small capacity is operated alone, the compressor 12 When the outdoor capacity is low due to the large capacity of), the liquid refrigerant does not evaporate in the indoor unit 52 having a small capacity.

When the unevaporated liquid refrigerant is excessively introduced into the common accumulator 60, there is a problem in that the compressor 12 is broken.

In addition, the two compressors 10 and 12 operate when both the large indoor unit 50 and the small capacity indoor unit 52 are operated or only the large indoor unit 50 is operated when the outdoor temperature is excessively high. In this case, when one compressor operates over load protector (OLP), there is a problem in that the compressor is damaged due to continuous OLP operation.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a compressor protection system and method for a package air conditioner which bypasses some refrigerants to a compressor according to an operating state and an outdoor temperature condition of a multi air conditioner to prevent damage to the compressor. do.

In order to achieve the above object, the present invention provides a plurality of compressors having different compression capacities of refrigerants, a condenser for reducing the pressure of the liquid refrigerant, and a condenser for making the liquid compressed by heat exchange with the outdoor air. A multi-air conditioner having a plurality of indoor units for vaporizing a liquid refrigerant, comprising: a bypass flow path for allowing a part of the refrigerant introduced into the condenser to exchange heat and flow into the compressor; A control valve for opening and closing the bypass flow path; A temperature sensor detecting a temperature of the surrounding outdoor air of the condenser; And a control unit for outputting a control signal for opening and closing the control valve according to whether the compressor is individually operated and the outdoor air temperature from the temperature sensor.

In addition, the bypass flow path for allowing a portion of the refrigerant introduced into the condenser to exchange heat is introduced into the compressor, characterized in that it comprises a capillary for reducing the pressure of the refrigerant moving to the compressor.

In addition, the present invention provides a method for protecting a compressor of a multi-air conditioner, the method comprising: a) determining whether a plurality of indoor units are operated by a controller; b) when the indoor units are all in operation, detecting the temperature of the surrounding outdoor air of the condenser from a temperature sensor to determine whether or not the first reference temperature for judging the opening and closing of the bypass passage to allow a portion of the refrigerant in the condenser to flow into the compressor is determined. step; And c) controlling the opening and closing of the bypass flow path by the controller according to the determination result of step b), wherein the ambient outdoor air temperature exceeds the first reference temperature for determining the opening and closing of the bypass flow path. The bypass flow path may be opened.

In addition, the step of determining whether the plurality of indoor units are all operated by the control unit includes: determining whether the indoor unit having a small cooling capacity when only one indoor unit is driven; If the indoor unit is an indoor unit having a small cooling capacity, determining whether the control unit detects the ambient outdoor air temperature of the condenser from the temperature sensor to determine whether the indoor passage is less than a second reference temperature for opening / closing the bypass flow path; And controlling, by the controller, to open or close the bypass flow path according to a result of comparison between the outdoor air temperature and a second reference temperature for determining whether the bypass flow path is opened or closed. The bypass flow path may be opened when the flow path is less than the second reference temperature for determining whether the flow path is open or closed.

Also, in the case where only one indoor unit is operated, determining whether the indoor unit has a small cooling capacity may include determining that the indoor unit is an indoor unit having a large cooling capacity. Determining whether or not the first reference temperature for opening / closing the bypass flow path for allowing the gas to flow into the compressor is exceeded; And controlling, by the controller, to open or close the bypass flow path according to a result of determining whether the bypass flow path has exceeded a first reference temperature. When the first reference temperature is exceeded, the bypass passage may be opened.

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

2 is a block diagram showing a configuration of a compressor protection system of a multi-air conditioner according to the present invention, FIG. 3 is a diagram illustrating a configuration of a multi-air conditioner to which the compressor protection system of FIG. 2 is applied, and FIG. 4 is a view of FIG. 3 according to the present invention. Is a perspective view showing a condenser provided with a bypass flow path. Referring to Figures 2 to 4 the compressor protection system of a multi-air conditioner according to the present invention will be described.

Repeated description of the same components as in the prior art will be omitted. The compressor protection system of the multi-air conditioner according to the present invention outdoor the refrigerant compressed in the first compressor 100, the second compressor 110, and the first and second compressors 100 and 110 having different compression capacities. It consists of a condenser (200) for making a liquid phase by heat exchange with air, a capillary tube (300) for reducing the pressure of the liquid refrigerant, and a first indoor unit (500) and a second indoor unit (510) for vaporizing the liquid refrigerant.

Only one or both of the first and second compressors 100 and 110 may be driven according to indoor and outdoor load fluctuations. The first and second compressors 100 and 110 may have the same or different compression capacity of the refrigerant and are preferably compressors having different capacities.

The refrigerant discharged from the first and second compressors 100 and 110 flows into the coagulator 200 through the inflow channel 120, and the end of the inflow channel 120 connected to the condenser 200 is formed in a Y shape. The refrigerant may be introduced into the pass passage 210 and the discharge passage 130.

The condenser 200 includes the first and second compressors 100 and 110 through the inflow passage 120 such that refrigerant flows through the check valves 101 and 111 installed at the outlet ends of the first and second compressors 100 and 110. Inflow into the bypass passage 210 and the first and second indoor units 500 and 510 connected to the 110 and allowing a portion of the refrigerant introduced through the inflow passage 120 to be bypassed to the common accumulator 600. A discharge flow path 130 is provided.

The bypass flow path 210 includes a bypass flow path opening control valve 240 for controlling the refrigerant to move from the condenser 200 to the common accumulator 600, and heat-exchanged at low temperature and high pressure in the condenser 200. Capillary tube 220 for converting the refrigerant into a low temperature low pressure refrigerant may be further included.

The first and second indoor units 500 and 510 are indoor units having different cooling capacities. In this embodiment, the cooling capacities of the first indoor units 500 are larger than the cooling capacities of the second indoor units 510. The liquid refrigerant discharged from the condenser 200 is introduced into the first and second indoor units 500 and 510 through the second valve 410 interlocked with the first valve 400 and the capillary tube 300, respectively, and the indoor air. Heat exchange with the refrigerant to be introduced into the common accumulator 600.

The control unit 700 determines whether both the first and second compressors 100 and 110 are operated or only one of them is operated, and the condenser (through the operating state of the first and second compressors 100 and 110 and the temperature sensor 230) 200) the operation of the bypass channel opening and closing control valve 240 is controlled according to the temperature of the outdoor air detected in the vicinity.

5 is a flowchart illustrating a compressor protection method of a multi-air conditioner system according to the present invention, and FIG. 6 is a flowchart illustrating a method of protecting a compressor during operation of the small capacity indoor unit of FIG. 5. A compressor protection method of a multi-air conditioner according to the present invention will be described with reference to FIGS. 2 to 6.

The control unit 700 detects an operating state of the first indoor unit 500 and the second indoor unit 510 (S100) and determines whether both the first and second indoor units 500 and 510 are being operated (S110). In operation S100, the operating states of the first and second compressors 100 and 110 as well as the operating states of the first and second indoor units 500 and 510 may be detected.

When the first and second indoor units 500 and 510 are both in operation S110, the control unit 700 detects the ambient outdoor air temperature of the condenser 200 from the temperature sensor 230 (S120). It is determined whether a portion of the refrigerant exceeds the first reference temperature for determining the opening and closing of the bypass flow path to allow the common accumulator 600 to flow in at step S130. The first reference temperature is an outdoor temperature at which OLP may be generated in the compressor.

When the outdoor air temperature detected in step S130 does not exceed the first reference temperature, the control unit 700 outputs a control signal to maintain the closed state of the control valve 240 so that the bypass flow path does not open. Operation is performed (S150).

In addition, when the outdoor air temperature detected in step S130 exceeds the first reference temperature, the control unit 700 outputs a control signal to maintain the open state of the control valve 240 so that the bypass flow path is opened.

Meanwhile, when only one indoor unit of the first and second indoor units 500 and 510 is operating in step S110, the controller 700 determines whether the indoor unit being operated is the second indoor unit 510 having a small cooling capacity ( In the case of the second indoor unit 510 having a small cooling capacity, the control unit 700 detects the ambient outdoor air temperature of the condenser 200 from the temperature sensor 230 (S210).

The outdoor air temperature detected in step S210 is compared with a second reference temperature for determining whether the bypass flow path is opened or closed (S220). When the detected outdoor air is greater than or equal to the second reference temperature, the controller 700 controls the control valve ( The control signal is output to maintain the closed state 240 to perform normal operation without opening the bypass flow path (S240). The second reference temperature is a temperature at which the refrigerant starts to evaporate in the indoor unit.

In addition, when the outdoor air temperature detected in step S220 is less than the second reference temperature, the control unit 700 outputs a control signal to maintain the open state of the control valve 240 so that the bypass flow path is opened.

On the other hand, if the indoor unit in operation in step S200 is an indoor unit with a large cooling capacity performs the above-described step S120 to S140.

As described above, the present invention has the advantage of preventing the damage of the compressor due to the evaporated liquid refrigerant by bypassing a part of the refrigerant flowing into the condenser according to the operating state of the indoor unit and the temperature of the outdoor air in the multi-air conditioner. have.

In addition, by reducing the amount of refrigerant circulation there is an advantage that the cooling operation can be performed smoothly while preventing the overheating of the compressor in the overload conditions with a relatively high outdoor temperature.

In the above, the present invention has been illustrated and described with respect to certain preferred embodiments. However, the present invention is not limited to the above-described embodiments, and those skilled in the art to which the present invention pertains can vary as many as possible without departing from the spirit of the present invention as set forth in the claims below. Changes may be made.

Claims (8)

A plurality of compressors having different compression capacities of refrigerants, a condenser for making the liquids compressed by the plurality of compressors by heat exchange with outdoor air, a capillary for reducing the pressure of the liquid refrigerant, and a plurality of indoor units for vaporizing the liquid refrigerant. In the multi-air conditioner having, A bypass passage through which a portion of the refrigerant introduced into the condenser exchanges heat and flows into the compressor; A capillary tube for reducing the pressure of the refrigerant moving to the compressor through the bypass passage; A control valve for opening and closing the bypass flow path; A temperature sensor detecting a temperature of the surrounding outdoor air of the condenser; And When all the compressors having different compression capacities of the refrigerant are driven or the compressors having large compression capacities are driven, a result of comparing the ambient outdoor air temperature of the condenser detected by the temperature sensor with a first reference temperature at which OLP may be generated in the compressor A second reference for outputting a signal for controlling the opening and closing of the bypass flow path, and when the compressor having a small compression capacity is driven, the internal outdoor air temperature of the condenser detected by the temperature sensor to start evaporation of the refrigerant in the indoor unit. And a control unit for outputting a signal for controlling the opening and closing of the bypass flow path in accordance with a result compared with temperature. delete As a compressor protection method of the multi-air conditioner, a) determining, by the controller, whether a plurality of indoor units having different cooling capacities are all operated or only one indoor unit is operated; b) when the indoor units are all in operation, the ambient outdoor air temperature of the condenser is detected from a temperature sensor, and the detected outdoor temperature is compared with a first reference temperature at which OLP may be generated in the compressor, whereby a part of the refrigerant in the condenser is Determining whether the bypass flow path is opened or closed so as to flow into the compressor; And c) when the ambient outdoor air temperature exceeds the first reference temperature at which the OLP can be generated in the compressor, the control unit opens the bypass flow path. Way. 4. The method of claim 3, wherein step a) comprises: determining whether the indoor unit has a small cooling capacity when only one indoor unit is operated; If the indoor unit is an indoor unit having a small cooling capacity, determining whether the control unit detects the ambient outdoor air temperature of the condenser from the temperature sensor to determine whether the indoor passage is less than a second reference temperature for opening / closing the bypass flow path; And And controlling the opening and closing of the bypass flow path by the controller according to a comparison result between the outdoor air temperature and a second reference temperature for determining the opening and closing of the bypass flow path. The method of claim 4, wherein the determining of whether the indoor unit has a small cooling capacity when operating only one indoor unit comprises: when the indoor unit is an indoor unit having a large cooling capacity, the controller detects the ambient outdoor air temperature of the condenser by using a temperature sensor. Determining whether a portion of a refrigerant of a condenser exceeds a first reference temperature for opening / closing the bypass flow path to allow the refrigerant to flow into the compressor; And And controlling the opening and closing of the bypass flow path by the controller according to a determination result of whether the first reference temperature for opening and closing the bypass flow path is exceeded. The method of claim 5, wherein the bypass flow path is opened when the surrounding outdoor air temperature exceeds the first reference temperature for determining whether the bypass flow path is opened or closed. 5. The method of claim 4, wherein the bypass flow path is opened when the ambient outdoor air temperature is less than the second reference temperature for determining whether the bypass flow path is opened or closed. delete

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