KR20120140085A - Heat pump of alternating type and method for operating the heat pump - Google Patents

Abstract

PURPOSE: An alternating type of a heat pump and operating method thereof are provided to basically prevent frost as the coil row of an outdoor unit successively changes under the environment that the frost may generated. CONSTITUTION: An alternating type of a heat pump comprises a compressor(200), an accumulator(270), an indoor unit(220), an outdoor unit, expansion valves, check valves, three-way valves, a control unit, and a bypass valve(280). The three-way valve is installed at the rear part of an outdoor unit coil row that is firstly in contact with external air. The control unit controls the three-way valves on the basis of load conditions and air conditions. The bypass valve supplies some refrigerant to the leading end of an outdoor unit, and the supplies left refrigerant to the indoor unit. [Reference numerals] (AA) Outdoor air

Description

Heat pump of alternating type and method for operating the heat pump}

The present invention includes an outdoor unit coil composed of three rows, and each row of the outdoor unit coil is connected to an evaporator according to outdoor conditions and load variations.

Combined use with optional condenser function can improve the performance of the heat pump, especially in the environment where the outdoor unit coils can be implanted in winter. The present invention relates to a heat pump which is essentially blocked.

1 is a schematic diagram of a standard heating operation method of a heat pump 10 according to the prior art filed and registered by the present inventor (10-0965057, "heat pump"), the compressor 200, the four-way valve 210, To include an indoor unit 220, a check valve 240, an expansion valve 230, a three-way valve 250, an outdoor unit main coil 90, an outdoor unit auxiliary coil 100, an outdoor unit blowing fan 110, and an accumulator 270. It is composed.

As shown in FIG. 1, in a standard heating condition in which frosting does not occur (outdoor air temperature of 5 ° C. or more), both the outdoor unit main coil 90 and the outdoor unit auxiliary coil 100 are operated as an evaporator to maximize the evaporation capacity of the heat pump. Improves performance.

2 is a schematic diagram of a method of operating the heat pump to allow defrosting and heating operation at the same time in the case of an external condition in which an frosting occurs. In the case of high humidity and outside air temperature range of -2 ~ 2 ℃, when the outdoor unit auxiliary coil 100 is operated as a condenser in order to suppress and delay the frost formed in the outdoor unit coil during the heat pump heating operation, the outdoor unit auxiliary coil 100 passes through Since warmed air passes through the outdoor unit main coil 90, it is possible to delay and suppress the idea that is formed in the outdoor unit main coil 90.

However, when the flow rate of the high-temperature and high-pressure refrigerant discharged from the compressor 200 and introduced into the outdoor unit auxiliary coil 100 is small, the air passing through the outdoor unit auxiliary coil 100 may not be sufficiently heated so that an frost is not formed. No effect is obtained. On the contrary, when the flow rate of the refrigerant flowing into the outdoor unit auxiliary coil 100 is large, it is possible to suppress and delay the occurrence of the implantation for a long time, but the amount of refrigerant flowing into the indoor unit 220 for heating is insufficient, so that the heating capacity is insufficient. Have.

In order to solve such a conflict, a heat pump user calculates an optimal amount of refrigerant that can simultaneously satisfy a desired level of heating ability (COP) and frosting delay time, and the refrigerant to the outdoor unit auxiliary coil 100 and the indoor unit 220. There is a need for a control method and apparatus that can accurately distribute the flow rate, which is very difficult to implement in a non-study commercial product.

Therefore, the present invention has been made to solve the above-mentioned conventional problems, the present invention is provided with an outdoor unit coil consisting of three rows, so that each outdoor unit coil is selectively performed as an evaporator and condenser function according to the outdoor conditions and load variations The combination can improve the performance of the heat pump, and in particular, in the environment where the outdoor unit coils can be implanted in winter, each outdoor unit coil sequence can be changed sequentially and operated as a condenser to fundamentally block the possibility of the occurrence of the implantation. It is an object to provide a heat pump.

In addition, the present invention is three three-way valve in the front row of the outdoor unit coil consisting of three rows and one three-way valve at the rear end of the first row of outdoor unit coils are installed to configure the outdoor unit according to the opening and closing sequence and method of the three-way valve during heating operation The purpose of the present invention is to provide a method of improving the performance of the heat pump at the same time by completely operating the coil heat under the condition that the frost can form in the coil heat (first to third heat) with the condenser. It is done.

In addition, the present invention maximizes the condensation capacity by using all of the outdoor unit coil heat as the condenser during the cooling operation of the heat pump, while increasing the outdoor air temperature such as the temperature of 40 ℃ or more, the temperature difference between the outdoor air temperature and the refrigerant is reduced If the condensation effect of the coil is drastically reduced, by using the first row of outdoor unit coils as the evaporator, the cooled air flows into the outdoor unit coils 2 and 3 rows, which naturally pass through the outdoor unit coils 1 row and acts as a condenser, thereby increasing the condensation effect. Through the purpose of providing a heat pump that can improve the cooling operation performance.

In addition, the present invention achieves the maximization of the evaporation capacity by using all of the outdoor unit coil heat as the evaporator during the heating operation of the heat pump, while the outdoor air temperature is lowered, such as cold climate climate, the temperature difference between the outdoor air temperature and the refrigerant is reduced When the evaporation effect of the coil is drastically reduced, by using the outdoor unit coil first row as the condenser, the heated air passes through the outdoor unit coil first row and flows into the outdoor unit coils 2 and 3 which naturally operate as the evaporator, thereby increasing the evaporation effect. Through the purpose of providing a heat pump that can improve the heating operation performance.

An object of the present invention is a compressor for compressing a refrigerant; An accumulator for separating the liquid refrigerant flowing into the compressor; A four-way valve for converting the refrigerant passing through the compressor into a heating or cooling circuit; An indoor unit performing heat exchange between the indoor air and the refrigerant; An outdoor unit composed of a three-coil coil to perform heat exchange between the outdoor air and the refrigerant; Expansion valve for reducing or reducing the refrigerant in accordance with the heating or cooling operation; Check valves installed in parallel to the expansion valve to control the flow of the refrigerant in one direction; A total of four three-way valves installed at the front end of the three-coil coil constituting the outdoor unit and at the rear end of the outdoor unit coil row first to exchange heat with the outside air; A controller for switching the refrigerant flow direction to control the three-way valve so that at least one of the outdoor unit coil rows is selectively operated as a condenser or evaporator function according to the load condition and the outdoor air condition; And a bypass valve for measuring the refrigerant discharged from the four-way valve to send a portion of the refrigerant to the front side of the outdoor unit, and send the remaining refrigerant to the indoor unit side.

The outdoor unit coil row is composed of the outdoor unit coils in the first, second and third rows, and the four-way valve changes the refrigerant flow direction, so that the outdoor unit coils in the first row, the second row and the third row according to the load condition and the outdoor air condition of the outdoor unit. In order to selectively function the third row as a condenser or evaporator, a first three-way valve is installed at the front of the outdoor unit coil first row, a fourth three-way valve is installed at the rear end of the outdoor unit coil first row, and the second is placed at the front of the outdoor unit coil second row. The three-way valve may be installed, and the third three-way valve may be installed in front of the third row of the outdoor unit coils.

When operating the heat pump to cool the air, the controller controls the first, second, third and fourth three-way valves to operate the outdoor unit coils first, second and third rows to the condenser so that the refrigerant discharged from the compressor is stored in the outdoor unit. The coil may be sucked into the front end of the first, second, and third rows, discharged to the rear end, and then sent to the indoor unit through the expansion valve and the check valve.

In addition, in order to increase the condensation performance of the outdoor unit in the heat conditions, the controller is configured to drive the outdoor unit second and third row to the condenser and the outdoor unit coil first row to the evaporator. By controlling the three-way valve, the refrigerant discharged from the compressor is sucked into the front end of the second and third rows of the outdoor unit coils and discharged to the rear end, and a part of the refrigerant condensed by the second and third rows of the outdoor unit coils expands the expansion valve and the check valve. After passing through to the indoor unit, the remaining refrigerant may be characterized in that the refrigerant flows into the rear end of the first column of the outdoor unit coil to discharge the evaporated refrigerant.

When the heat pump is operated with heating, the controller controls the first, second, third and fourth three-way valves to drive the outdoor unit coils first, second and third rows to the evaporator so that the refrigerant discharged from the compressor is everywhere. After passing through the valve, the indoor unit, the check valve, and the expansion valve, the outdoor unit coils may be sucked into the rear ends of the first, second, and third rows, and then evaporated to be discharged to the front end.

In order to increase the evaporation performance of the outdoor unit through the elimination and suppression of the outdoor unit coil first row, the controller is configured to drive the outdoor unit coil second and third row to the evaporator and to operate the outdoor unit coil first row to the condenser. By controlling the second, third, and fourth three-way valves and bypass valves, the refrigerant discharged from the compressor passes through the four-way valve, and some of the refrigerant passes through the indoor unit, the check valve, and the expansion valve to the rear end of the second and third rows of outdoor unit coils. After the suction is evaporated to be discharged to the front end, the remaining refrigerant may be introduced into the front end of the first column of the outdoor unit coil to discharge the condensed refrigerant to the rear end.

In order to increase the evaporation performance of the outdoor unit through the elimination and suppression of the outdoor unit coil second row, the controller is configured to drive the outdoor unit coil first and third rows to the evaporator and to operate the outdoor unit coil second row to the condenser. By controlling the second, third, and fourth three-way valves and bypass valves, the refrigerant discharged from the compressor passes through the four-way valve, and some of the refrigerant passes through the indoor unit, the check valve, and the expansion valve to the rear end of the first and third rows of outdoor unit coils. After the suction is evaporated to be discharged to the front end, the remaining refrigerant may be introduced into the front end of the second column of the outdoor unit coil to discharge the condensed refrigerant to the rear end.

In order to increase the evaporation performance of the outdoor unit through the elimination and suppression of the outdoor unit coil third row, the controller is configured to operate the outdoor unit coil first and second rows as the evaporator and to operate the outdoor unit coil third row as the condenser. By controlling the second, third, and fourth three-way valves and bypass valves, the refrigerant discharged from the compressor passes through the four-way valve, and some of the refrigerant passes through the indoor unit, the check valve, and the expansion valve to the rear end of the outdoor unit coils first and second rows. After the suction is evaporated to be discharged to the front end, the remaining refrigerant may be introduced into the front end of the third column of the outdoor unit coil to discharge the condensed refrigerant to the rear end.

The outdoor unit further includes an implantation detecting sensor for detecting whether there is an implantation or frost in at least one of the outdoor unit coils 1st, 2nd, and 3rd row, or in a condition in which an implantation or frost is formed, and the controller is implanted. When the sensing signal is applied by the sensing sensor, the first, second, third and fourth three-way valves are controlled to operate the outdoor unit coil heat in which the frost or frost is formed as a condenser, or the first, second, third In addition, the fourth three-way valve may be controlled to sequentially operate the outdoor unit coils first, second, and third rows as a condenser.

In another category, an object of the present invention is a method of operating an alternating heat pump as described above in standard cooling, comprising: discharging a high-temperature, high-pressure gas refrigerant from a compressor to pass through a four-way valve; The refrigerant is introduced into the front end of the outdoor unit coils first, second and third rows by the first, second, third and fourth three-way valves and the condensed refrigerant is discharged to the rear end; The refrigerant condensed by the outdoor unit coil heat flows into the indoor unit through the check valve and the expansion valve, absorbs heat, and is discharged into the evaporated refrigerant; And the refrigerant evaporated by the indoor unit is introduced into the compressor via the four-way valve and the accumulator: it can be achieved by the operating method of the alternating heat pump comprising a.

In addition, the method for cooling the alternating heat pump described above in a cold condition, the method comprising: discharging the high-temperature and high-pressure gas refrigerant from the compressor to pass through the four-way valve; The refrigerant flowing into the front end of the second and third rows of the outdoor unit coils by the first, second, third and fourth three-way valves to discharge the condensed refrigerant to the rear end; Some of the refrigerant condensed and discharged by the second and third rows of outdoor unit coils are sent to the indoor unit, and the remaining refrigerant is sent to the rear end side of the first row of outdoor unit coils; Some refrigerant is introduced into the indoor unit to absorb heat and is discharged to the evaporated refrigerant, and the other refrigerant is introduced into the rear end side of the first column of the outdoor unit coil so that the evaporated refrigerant is discharged to the front end; And the refrigerant evaporated by the indoor unit and the refrigerant evaporated by the outdoor unit coil first heat are introduced into the compressor through the four-way valve and the accumulator. 2.

And, in the method of operating the alternating heat pump described above standard heating, the step of discharging the high-temperature and high-pressure gas refrigerant from the compressor to pass through the four-way valve; the refrigerant is introduced into the indoor unit to release heat to the room and condensed refrigerant Discharging the condensed refrigerant to the rear end of the outdoor unit coils through the check valve and the expansion valve and evaporating the refrigerant; And the evaporated refrigerant may be achieved by a method of operating an alternating heat pump comprising a step of flowing into the compressor via the four-way valve and the accumulator.

A method of operating an alternating heat pump described above in an implantation condition, the method comprising: discharging a high temperature and high pressure gas refrigerant from a compressor to pass through a four-way valve; Sending, by the bypass valve, some refrigerant to the front side of any one of the outdoor unit coils, and the other refrigerant to the indoor unit side; Some refrigerant flows into the front end of any one of the outdoor unit coil rows by the first, second, third and fourth three-way valves to discharge the condensed refrigerant, and the other refrigerant flows into the indoor unit to release heat to the room and condensate. Discharging the refrigerant; Discharging the refrigerant evaporated and introduced into the rear end of the outdoor unit coil not condensed by combining the refrigerant condensed by the indoor unit with the refrigerant condensed into the front end of the outdoor unit coil heat; And the evaporated refrigerant is introduced into the compressor via the four-way valve and the accumulator: it can be achieved by the operating method of the alternating heat pump characterized in that it comprises a.

As described above, the heat pump according to the present invention may expect the following effects according to the outdoor unit coil operation method.

First, it is possible to improve the heat pump cooling performance by increasing the condensation performance by using all of the outdoor unit coil heat as the condenser when operating the heat pump for cooling in the summer, and the condensation effect of the outdoor unit coil is reduced by increasing the outdoor air temperature during the cooling operation. In this case, the heat pump cooling performance can be expected to be improved by increasing the condensation effect by using the outdoor unit coil first heat as an evaporator.

Second, when the winter heat pump is operated with heating, all the outdoor unit coils can be used as the evaporator to improve the heat pump performance by increasing the evaporation performance, and when the outdoor air temperature is lowered during the heating operation, the outdoor unit coil's evaporation effect is reduced. By using the first heat in the coil as a condenser, it is expected to improve the performance of the heat pump by increasing the evaporation effect.

Third, when the outdoor air is in a condition that can easily form an implantation, select the most popular outdoor unit coil heat among the outdoor coils and operate it as a condenser, or operate the outdoor unit coil heat sequentially and selectively as a condenser at regular time intervals. By doing so, it is possible to fundamentally block the occurrence of frosting and growth and to provide a heat pump capable of continuous heating without interruption of heating due to defrosting.

1 is a block diagram of a heat pump for performing a standard heating operation according to the prior art,
2 is a configuration diagram of a heat pump performing defrosting and heating operation according to the prior art;
3 is a configuration diagram of an alternating heat pump operating in standard heating according to an embodiment of the present invention;
4 is a configuration diagram of an alternating heat pump in which an outdoor unit coil first row operates as a condenser to perform defrost heating operation according to an embodiment of the present invention;
5 is a configuration diagram of an alternating heat pump for performing a defrost heating operation by operating the outdoor unit coil second row as a condenser according to an embodiment of the present invention;
FIG. 6 is a configuration diagram of an alternating heat pump in which an outdoor unit coil third row operates as a condenser to perform defrost heating operation according to an embodiment of the present invention; FIG.
7 is a configuration diagram of an alternating heat pump operating in standard cooling according to an embodiment of the present invention;
8 is a block diagram of an alternating heat pump in which the outdoor unit coil first heat is operated as an evaporator to perform a cooling operation according to an embodiment of the present invention.

Hereinafter, the configuration, operation, and operation method of an alternating heat pump according to an embodiment of the present invention shown in the accompanying drawings will be described in detail. First, the case in which the alternating heat pump according to an embodiment of the present invention operates in defrost heating will be described.

FIG. 3 shows a configuration diagram of an alternating heat pump 20 operating in standard heating according to an embodiment of the present invention in an outdoor air condition in which frosting does not occur. As shown in FIG. 3, the alternating heat pump 20 according to an embodiment of the present invention includes an outdoor unit coil first row 260-1, an outdoor unit coil second row 260-2, and an outdoor unit coil third The outdoor unit 260, the compressor 200, the bypass valve 280, the four-way valve 210, the indoor unit 220, the first, second, third, and fourth three-way valves provided with rows 260-3. (250-1, 250-2, 250-3, 250-4) and the like.

As shown in FIG. 3, in order to maximize the evaporation capacity when the implantation does not occur, all of the coil rows constituting the outdoor unit are operated as an evaporator, thereby contributing to performance improvement. Therefore, a controller (not shown) controls the first, second, third and fourth three-way valves 250-1, 250-2, 250-3, 250-4 such that all outdoor unit coil heat is operated as an evaporator (i.e., the controller In order to operate the first row, the second row, and the third row as the evaporator, the condensed refrigerant flows into the rear end of each coil row, evaporates, and discharges to the front end (BD line, FG line, IJ line). Second, third and fourth three-way valves 250-1,250-2,250-3,250-4. The refrigerant condensed through the indoor unit 220 passes through the first check valve 240-1 and the heating expansion valve 230-2 and passes through the fourth three-way valve 250-4, so that some of the refrigerant is in the first column of the outdoor unit coil ( 260-1, the remaining refrigerant may be sent to the outdoor unit coil second row 260-2 and the third row 260-3 to be evaporated, thereby improving heating performance by maximizing evaporation capability.

4 is a block diagram of an alternating heat pump 20 in which an outdoor unit coil first row 260-1 operates as a condenser to perform defrost heating operation according to an embodiment of the present invention. As shown in FIG. 4, the high temperature and high pressure gas refrigerant discharged from the compressor 200 passes through the first pipe 300-1 and the four-way valve 210. Thereafter, some of the refrigerant metered by the bypass valve 280 flows into the outdoor unit coil first row 260-1 through the second pipe 300-2 and the first three-way valve 250-1. The remaining refrigerant is sent to the indoor unit 220.

Therefore, the outdoor unit coil first row 260-1 operates as a condenser to heat outdoor air, and if frost exists on the surface of the outdoor unit coil first row 260-1, the frost is melted to remove or frost is formed. Can be prevented continuously. Since the heated air passes through the outdoor unit coil second row 260-2 and the third row 260-3, which act as an evaporator, the heated air improves the evaporation ability and suppresses and delays the formation of the idea.

In this case, the controller is configured to operate the outdoor three-way valve 250-1 and the fourth three-way valve 250-4 to operate the outdoor unit coil first row 260-1 as a condenser. -1) open to flow to the front end (forward opening, AB line). In addition, the controller is the second three-way valve (250-2) and the third three-way valve (250-3) the high-temperature, high-pressure refrigerant is the outdoor unit coil second row (260-2) and outdoor unit coil third row (260-3) To be closed (reversely open) to prevent flow.

After the refrigerant condensed while passing through the outdoor unit coil first row 260-1, the refrigerant condensed while passing through the indoor unit 220 and the fourth condenser 300-4 after the expansion valve 230-2 for heating are combined ( As shown in FIG. 4, the third tube 300-3 is introduced into the second column 260-2 and the third column 260-3 of the outdoor unit coil operated by the evaporator and evaporated after being introduced into the evaporator. ), The four-way valve 210 and the accumulator 270 is sucked into the compressor 200 to complete the defrost heating cycle.

5 is a block diagram of an alternating heat pump 20 in which the outdoor unit coil second row 260-2 operates as a condenser to perform defrost heating operation according to an embodiment of the present invention. As shown in FIG. 5, the high-temperature, high-pressure gas refrigerant from the compressor 200 passes through the first pipe 300-1 and the four-way valve 210, and then some of the refrigerant metered by the bypass valve 280 is The outdoor unit coils are sent to the second column 260-2 through the second pipe 300-2 and the second three-way valve 250-2, and the remaining refrigerant is sent to the indoor unit 220.

Therefore, the outdoor unit coil second row 260-2 acts as a condenser to heat outdoor air, and if frost is present on the surface of the second row coil 260-2, the frost is dissolved to remove or frost continues to form. To prevent. Since the heated air passes through the outdoor unit coil third column 260-3, which acts as an evaporator, it improves evaporation ability and suppresses and delays the formation of frost in the outdoor unit coil third column 260-3. .

In this case, the controller opens the second three-way valve 250-2 in the forward direction (E-F line) to operate the outdoor unit coil second row 260-2 as a condenser. Therefore, the high temperature and high pressure refrigerant may flow into the front end of the outdoor unit coil second row 260-2 and be discharged to the rear end. In addition, the controller may prevent the high temperature and high pressure refrigerant from flowing into the outdoor unit coil first row 260-1 and the outdoor unit coil third row 260-3. 250-3).

After the refrigerant condensed while passing through the outdoor unit coil second column 260-2 is combined with the refrigerant condensed while passing through the indoor unit 220 and on the fourth pipe 300-4 after the expansion valve 230-2 for heating ( As shown in FIG. 5, the outdoor unit coil operated as the evaporator as shown in FIG. 5 is introduced into the first row 260-1 and the third row 260-3 and evaporated, followed by the third pipe 300-3. ), The four-way valve 210 and the accumulator 270 is sucked into the compressor 200 to complete the defrost heating cycle.

6 is a block diagram of an alternating heat pump 20 in which the third column of the outdoor unit coil operates as a condenser to perform defrost heating operation according to an embodiment of the present invention. As shown in FIG. 6, the high-temperature, high-pressure gas refrigerant from the compressor 200 passes through the first pipe 300-1 and the four-way valve 210, and then some of the refrigerant metered by the bypass valve 280. Is introduced into the outdoor unit coil third row (260-3) through the second pipe (300-2) and the third three-way valve (250-3), the remaining refrigerant is sent to the indoor unit (220).

Therefore, the outdoor unit coil third row 260-3 operates as a condenser and if frost exists on the surface of the outdoor unit coil third row 260-2, the frost is melted and removed or the frost is continuously prevented from forming.

In this case, the controller controls the third three-way valve 250-3 to open in the forward direction (H-I line) to operate the outdoor unit coil third row 260-3 as a condenser. Accordingly, the high temperature and high pressure gas refrigerant may flow into the front end of the outdoor unit coil third row 260-3 and be discharged to the rear end. In addition, the first three-way valve 250-1 and the second three-way valve 250-may prevent high temperature and high pressure refrigerant from flowing into the outdoor unit coil first row 260-1 and the outdoor unit coil second row 260-2. 2) will be closed.

The refrigerant condensed while passing through the outdoor unit coil third row 260-3 is combined with the refrigerant condensed while passing through the indoor unit 220 on the fourth pipe 300-4 after the expansion valve 230-2 for heating and then evaporator. After the outdoor unit coils operated by the first stage 260-1 and the second stage 260-2 are evaporated and evaporated, the third pipe 300-3, the four-way valve 210 and the accumulator 270 are The defrosting heating cycle is completed by suction through the compressor 200.

In addition, the outdoor unit may further include an implantation condition detecting device (not shown) to selectively prevent the formation of the outdoor unit coil by operating only the outdoor unit coil train in which the implantation is formed, as the condenser, and at predetermined time intervals, FIGS. 4 to 6. By sequentially repeating the operation method shown in the above, by operating each row of the outdoor unit coils as a condenser, it is possible to fundamentally prevent the idea formed in the outdoor unit coils. That is, when an idea is detected by the concept of the interphase interception device, the detection signal is transmitted to the controller, and the controller controls the three-way valve of the coil of the outdoor unit in which the implantation has occurred to operate the coil unit of the outdoor unit as a condenser, and controls the bypass valve. Therefore, the proper flow rate is adjusted to enter the outdoor unit coil heat.

FIG. 7 is a block diagram of an alternating heat pump 20 operating in standard cooling according to an embodiment of the present invention. As shown in FIG. 7, the high-temperature, high-pressure gas refrigerant from the compressor 200 is distributed on the third pipe 300-3 through the four-way valve 210 and respectively, the first three-way valve 250-1 and the second. Through the three-way valve 250-2 and the third three-way valve 250-3, the outdoor unit coil is sent to the first row 260-1, the second row 260-2, and the third row 260-3 to condense. do. That is, when driving at standard cooling, all of the outdoor unit coils first row 260-1, the second row 260-2, and the third row 260-3 act as condensers to maximize the cooling capability.

At this time, the first to fourth three-way valves 250-1, 250-2, 250-3, and 250-4 are forward directions (DB line, GF line) so that the high-temperature, high-pressure gas refrigerant can flow to all outdoor unit coils. , JI line). The refrigerant condensed while passing through the outdoor unit coil rows 260-1, 260-2, and 260-3 is combined on the fourth pipe 300-4, and then the second check valve 240-2 and the expansion valve 230 for cooling are cooled. After passing through -1) it is sent to the indoor unit (220). The indoor space may be cooled by absorbing heat from the indoor air while the refrigerant evaporates in the indoor unit 220. The refrigerant evaporated in the indoor unit 220 passes through the four-way valve 210 and the accumulator 270 and is sucked into the compressor 200 to complete a cooling cycle.

8 is a block diagram of an alternating heat pump 20 in which an outdoor unit coil first row 260-1 operates as an evaporator to perform a cooling operation according to an embodiment of the present invention. As shown in FIG. 8, the high-temperature, high-pressure gas refrigerant from the compressor 200 passes through the four-way valve 210 and the third pipe 300-3 to the outdoor unit coil second row 260-2 and the third row ( 260-3) to condense.

At this time, the controller is such that the high-temperature, high-pressure gas refrigerant flows into the outdoor unit coils in the second row 260-2 and the third row 260-3, and thus the second three-way valve 250-2 and the third three-way valve 250-. 3) the first three-way valve (250-1) and the fourth three-way valve (250-) so that the high-temperature, high-pressure gas refrigerant to the outdoor unit coil first row (260-1) to prevent the inflow of gas refrigerant. 4) to control.

The refrigerant condensed while passing through the outdoor unit coil second row 260-2 and the third row 260-3 is combined on the fourth pipe 300-4, and then the check valve 240-2 and the cooling expansion valve ( After passing through 230-1, some of the refrigerant is along the fifth pipe 300-5, the fourth three-way valve 250-4, the outdoor unit coil first row 260-1, and the second pipe 300-2. The remaining refrigerant is sent to the indoor unit coil 220.

Therefore, the outdoor unit coil first row 260-1 acts as an evaporator to reduce the outdoor air temperature through heat exchange with the outdoor air, and the cooled air is controlled from the outdoor unit coil second row 260-2 which acts as a condenser. By passing through the three columns 260-3, the condensation effect can be increased. After the refrigerant passing through the indoor unit 220 and the refrigerant passing through the outdoor unit coil first column 260-1 are combined at the discharge unit side of the indoor unit 220, the four-way valve 210 and the accumulator 270 are sequentially passed. Suction by compressor 200 completes the cooling cycle under extreme weather conditions.

As described above, the present invention improves the performance of the heat pump by using a three-way valve to switch the refrigerant circuit to selectively convert some heat in the outdoor unit coil to a condenser or evaporator according to the load and the outdoor air temperature and humidity conditions in the heat pump. In particular, it is a basic technical idea to be able to completely heat the indoor space while preventing the frosting on the outdoor unit coil perfectly under the outdoor air condition, which may occur during winter heating operation.

Although the present invention has been described above by using a preferred embodiment of the present invention, the principles of the present invention are not limited by the scope described in the above embodiments, and those skilled in the art can make various modifications within the technical scope defined by the claims. Modifications may be made and such modifications should also be construed as falling within the scope of the present invention.

10: conventional heat pump 20: alternating heat pump according to an embodiment of the present invention
90: main coil 100: auxiliary coil
110: blower 200: compressor
210: four-way valve 220: indoor unit
230-1: Expansion expansion valve for cooling 230-2: Expansion expansion valve for heating
240-1: First check valve 240-2: Second check valve
250-1: first three-way valve 250-2: second three-way valve
250-3: third three-way valve 250-4: fourth three-way valve
260-1: Outdoor unit coil first row 260-2: Outdoor unit coil second row
260-3: Outdoor unit coil third row 270: Accumulator
280: bypass valve 300-1: first pipe
300-2: Second Hall 300-3: Third Hall
300-4: Hall 4 300-5: Hall 5

Claims (17)

A compressor for compressing the refrigerant;
An accumulator for separating the liquid refrigerant flowing into the compressor;
A four-way valve for converting the refrigerant passing through the compressor into a heating or cooling circuit;
An indoor unit performing heat exchange between the indoor air and the refrigerant;
An outdoor unit having a three-coil coil configured to perform heat exchange between the outdoor air and the refrigerant;
Expansion valve for reducing or reducing the refrigerant in accordance with the heating or cooling operation;
Check valves installed in parallel to the expansion valve to control the flow of the refrigerant in one direction;
Four three-way valves installed at the front end of each of the three-coil coils constituting the outdoor unit and the outdoor unit coil row first contacting the outside air among the outdoor unit coil rows;
A controller for changing the refrigerant flow direction to control the three-way valve so that at least one of the outdoor unit coil rows is selectively operated as a condenser or evaporator function according to the load condition and the outdoor air condition; And
And a bypass valve for measuring the refrigerant discharged from the four-way valve and sending a portion of the refrigerant to the front side of the outdoor unit, and sending the remaining refrigerant to the indoor unit.
The method of claim 1,
The outdoor unit coil row is composed of outdoor unit coils in the first row, the second row, and the third row, and the four-way valve changes the refrigerant flow direction so that the outdoor unit coils in the first row and the second row according to the outdoor unit's load condition and outdoor air condition. And a third three-way valve at a front end of the outdoor unit coil first row, a fourth three-way valve at a rear end of the outdoor unit coil first row, and a fourth three-way valve at the front end of the outdoor unit coil second row so as to selectively function the third row as a condenser or an evaporator. The second three-way valve is installed, the alternating heat pump, characterized in that the third three-way valve is installed in front of the third row of outdoor unit coil.
The method of claim 2,
A detection sensor for detecting whether an frost or frost exists in at least one of the first, second and third rows of the outdoor unit coils, whether the frost is formed in a condition where an frost or frost is formed, or whether the frost is in a cold condition. Alternating heat pump, characterized in that it further comprises.
The method of claim 3,
The controller controls the three-way valve when the sensing signal is applied by the sensing sensor to operate the outdoor unit coil heat of the idea or the frost formed as a condenser, or the first unit heat of the outdoor unit coil when the temperature is severe. Alternating heat pump, characterized in that for operating.
5. The method of claim 4,
And the controller controls the three-way valve to sequentially operate the outdoor unit coil heat as a condenser or evaporator when the sensing signal is applied by the sensing sensor.
The method of claim 2,
When operating the heat pump in standard cooling,
The controller controls the first, second, third and fourth three-way valves to operate the outdoor unit coils first, second and third rows as a condenser so that the refrigerant discharged from the compressor is stored in the outdoor unit coil first. And alternate heat pumps, which are sucked into the front end of the second and third rows and discharged to the rear end and sent to the indoor unit via the expansion valve and the check valve.
The method according to claim 6,
In order to increase the condensation performance of the outdoor unit under extreme conditions,
The controller controls the first, second, third and fourth three-way valves to discharge the compressor from the compressor to drive the outdoor unit coils 2 and 3 rows to a condenser and to drive the outdoor unit coils 1 row to the evaporator. The refrigerant is sucked into the front end of the second and third rows of the outdoor unit coils and discharged to the rear end, and a part of the refrigerant condensed by the second and third rows of the outdoor unit coils is sent to the indoor unit through the expansion valve and the check valve. And the remaining refrigerant flows into the rear end of the first column of the outdoor unit coil to discharge the evaporated refrigerant.
The method of claim 2,
When operating the heat pump in standard heating,
The controller controls the first, second, third and fourth three-way valves to operate the outdoor unit coils first, second and third rows by an evaporator, so that the refrigerant discharged from the compressor is stored in the indoor unit and the check valve. And an alternating heat pump passing through an expansion valve to be sucked into the rear ends of the first, second and third rows of the outdoor unit coils to be evaporated and discharged to the front end.
The method of claim 8,
In order to increase the condensation performance of the outdoor unit under the implantation condition,
The controller controls the first, second, third, and fourth three-way valves and the bypass valve to drive the outdoor unit coils second and third rows with an evaporator and the outdoor unit coil first rows with a condenser. The refrigerant discharged from the compressor passes through the four-way valve to pass some refrigerant through the indoor unit, the check valve and the expansion valve to be sucked into the rear end of the second and third rows of the outdoor unit coils, evaporated and discharged to the front end, The remaining refrigerant flows into the front end of the outdoor unit coil first heat coil, and the condensed refrigerant is discharged to the rear end.
The method of claim 8,
In order to increase the condensation performance of the outdoor unit under the implantation condition,
The controller controls the first, second, third, and fourth three-way valves and the bypass valve to drive the outdoor unit coils first and third rows with an evaporator and the outdoor unit coil second rows with a condenser. The refrigerant discharged from the compressor passes through the four-way valve to pass some of the refrigerant through the indoor unit, the check valve and the expansion valve to be sucked into the rear end of the first and third rows of the outdoor unit coil, evaporated and discharged to the front end, The remaining refrigerant flows into the front end of the second column of outdoor unit coils so that the condensed refrigerant is discharged to the rear end.
The method of claim 8,
In order to increase the condensation performance of the outdoor unit under the implantation condition,
The controller controls the first, second, third, and fourth three-way valves and the bypass valve to drive the outdoor unit coils first and second rows to an evaporator and the outdoor unit coil third rows to a condenser. The refrigerant discharged from the compressor passes through the four-way valve to pass some refrigerant through the indoor unit, the check valve and the expansion valve to be sucked into the rear end of the first and second rows of outdoor unit coils, evaporated and discharged to the front end, The remaining refrigerant flows into the front end of the third column of outdoor unit coils so that the condensed refrigerant is discharged to the rear end.
In the operating method of the alternating heat pump of claim 6,
Discharging the high temperature and high pressure gas refrigerant from the compressor and passing through the four-way valve;
Discharging the refrigerant condensed into the front end of the first, second, and third rows of the outdoor unit coils by the first, second, third and fourth three-way valves and discharging the condensed refrigerant to the rear end;
A refrigerant condensed by an outdoor unit coil heat is introduced into the indoor unit through a check valve and an expansion valve, absorbs heat, and is discharged into the evaporated refrigerant; And
The refrigerant evaporated by the indoor unit is introduced into the compressor via the four-way valve and the accumulator: operating method of the alternating heat pump comprising a.
In the operating method of the alternating heat pump of claim 7,
Discharging the high temperature and high pressure gas refrigerant from the compressor and passing through the four-way valve;
Discharging the refrigerant condensed into the front end of the second and third rows of the outdoor unit coils by the first, second, third and fourth three-way valves and then discharging the refrigerant to the rear end;
Some of the refrigerant condensed and discharged by the second and third rows of outdoor unit coils are sent to the indoor unit, and the remaining refrigerant is sent to the rear end side of the first row of outdoor unit coils;
The partial refrigerant is introduced into the indoor unit to absorb heat and is discharged into the evaporated refrigerant, and the remaining refrigerant is introduced into the rear end side of the first row of the outdoor unit coil so that the evaporated refrigerant is discharged to the front end; And
And the refrigerant evaporated by the indoor unit and the refrigerant evaporated by the first column of the outdoor unit coil are introduced into the compressor through the four-way valve and the accumulator.
In the method of operating the alternating heat pump of claim 8,
Discharging the high temperature and high pressure gas refrigerant from the compressor and passing through the four-way valve;
The refrigerant is introduced into the indoor unit to release heat to the room and the condensed refrigerant is discharged;
The condensed refrigerant is introduced into the rear end of the outdoor unit coils through the check valve and the expansion valve and discharged from the evaporated refrigerant; And
The evaporated refrigerant is introduced into the compressor via the four-way valve and the accumulator: operating method of an alternating heat pump.
In the operating method of the alternating heat pump of claim 9,
Discharging the high temperature and high pressure gas refrigerant from the compressor and passing through the four-way valve;
Sending, by the bypass valve, some refrigerant to the front side of the outdoor unit coil first row, and the other refrigerant to the indoor unit side;
Some of the refrigerant flows into the front end of the first column of the outdoor unit coil by the first, second, third and fourth three-way valves to discharge the condensed refrigerant, and the remaining refrigerant flows into the indoor unit to discharge heat into the room. Discharging the condensed refrigerant;
The refrigerant condensed by the first outdoor unit coil and the refrigerant condensed by the indoor unit are combined to discharge the refrigerant evaporated into the rear end of the second and third columns of the outdoor unit coil; And
The evaporated refrigerant is introduced into the compressor via the four-way valve and the accumulator: operating method of an alternating heat pump.
In the operating method of the alternating heat pump of claim 10,
Discharging the high temperature and high pressure gas refrigerant from the compressor and passing through the four-way valve;
Sending, by the bypass valve, some refrigerant to the front side of the second row of outdoor unit coils, and the other refrigerant to the indoor unit side;
The refrigerant flows into the front end of the second column of the outdoor unit coils by the first, second, third and fourth three-way valves to discharge the condensed refrigerant, and the remaining refrigerant flows into the indoor unit to discharge heat into the room. Discharging the condensed refrigerant;
The refrigerant condensed by the second row of outdoor unit coils and the refrigerant condensed by the indoor unit are combined to discharge the refrigerant evaporated into the rear end of the first and third rows of outdoor unit coils and discharged; And
The evaporated refrigerant is introduced into the compressor via the four-way valve and the accumulator: operating method of an alternating heat pump.
In the method of operating the alternating heat pump of claim 11,
Discharging the high temperature and high pressure gas refrigerant from the compressor and passing through the four-way valve;
Sending, by the bypass valve, some refrigerant to the front side of the third row of outdoor unit coils, and the other refrigerant to the indoor unit side;
The partial refrigerant flows into the front end of the third column of the outdoor unit coil by the first, second, third and fourth three-way valves to discharge the condensed refrigerant, and the remaining refrigerant flows into the indoor unit to discharge heat into the room. Discharging the condensed refrigerant;
The refrigerant condensed by the third row of outdoor unit coils and the refrigerant condensed by the indoor unit are combined to discharge the refrigerant evaporated into the rear end of the first row and the second row of outdoor unit coils to be evaporated; And
The evaporated refrigerant is introduced into the compressor via the four-way valve and the accumulator: operating method of an alternating heat pump.

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