KR20200049035A - Air Conditioning system - Google Patents

Abstract

The present invention relates to an air conditioning system which removes air in a water pipe connected between a distributor and an indoor unit. The air conditioning system may comprise: an outdoor unit; a distributor including first and second heat exchangers for heat exchange of a refrigerant having flowed in the outdoor unit with water; an indoor unit connected to the distributor; a first circulation pump for circulating water between the first heat exchanger and the indoor unit; a second circulation pump for circulating water between the second heat exchanger and the indoor unit; a purge valve installed at an inlet of the indoor unit; and a main controller which implements a main air removal operation to remove air contained in a water pipe between the first and second heat exchangers and the indoor unit, and a sub air removal operation to remove air by controlling the opening rate of the purge valve to be lower than the opening rate of the purge valve in a normal air removal operation.

Description

Air Conditioning System

The present invention relates to an air conditioning system, and more particularly, to an air conditioning system including an indoor unit.

In general, an air conditioner is a device for cooling or heating an indoor space such as a residential space, restaurant, or office. In order to more efficiently cool or heat the indoor space divided into a plurality of rooms, the development of a multi-air conditioner with simultaneous heating and cooling to cool or heat each room has been continuously conducted.

In particular, the fan coil unit (FCU) of the air conditioner receives cold water or hot water from a freezer or a boiler during cooling and heating of a building, cools or heats the surrounding air while passing through a heatexchanger, and then heats it. It is an air conditioner that cools or heats the air by discharging the air into the room according to the operation of a blower.

The distributor connected to the fan coil unit may supply cold water or hot water to the fan coil unit, and a water flow channel may be formed between the distributor and the fan coil unit.

On the other hand, when a gas such as air is included in the water channel, the circulating flow rate becomes non-uniform, and there is a problem that causes a failure of the pump installed in the water channel.

The present invention seeks to remove the air contained in the water pipe between the distributor and the indoor unit.

The air conditioning system according to an embodiment of the present invention is an outdoor unit, a distributor including first and second heat exchangers for heat exchange of refrigerant flowing in the outdoor unit with water, an indoor unit connected to the distributor, and circulating water between the first heat exchanger and the indoor unit A first circulation pump, a second circulation pump for circulating water between the second heat exchanger and the indoor unit, a purge valve installed at the inlet of the indoor unit, and removing air included in the water pipe between the first and second heat exchangers and the indoor unit It may include a main air removal operation and a controller for controlling the opening rate of the purge valve to be lower than the opening rate of the purge valve during the normal air removal operation to perform a sub-air removal operation to remove air.

The controller may start the main air removal operation, and perform a sub air removal operation when the difference between the RPM of the first circulation pump and the RPM of the second circulation pump is equal to or less than the set value.

The first heat exchanger controls the water flowing from the first heat exchanger to the indoor unit, the second flow valve controls the water flowing from the second heat exchanger to the indoor unit, and the water flowing from the indoor unit to the first heat exchanger and the first heat exchanger. 2 It further includes a three-way valve that guides at least one of the heat exchangers, and the controller can control the three-way valve to guide water flowing from the indoor unit to the first and second heat exchangers, respectively, during the main air removal operation.

The controller may fully open the first flow valve and the second flow valve during sub-air removal operation.

When the main air removal operation is performed, the controller fully closes the second flow valve for a set time, first circulation line air removal mode for pulling the first flow valve on, and first flow valve for a set time, and second A second circulation line air removal mode in which the flow valve is pulled can be performed.

If the difference between the RPM of the first circulation pump and the RPM of the second circulation pump exceeds a set value, the controller re-executes the second circulation line air removal mode when the RPM of the first circulation pump is faster than the RPM of the second circulation pump. 2 If the RPM of the circulation pump is faster than the RPM of the first circulation pump, the first circulation line air removal mode may be re-executed.

When the RPM difference between the RPM of the first circulation pump and the RPM of the second circulation pump exceeds a set value, the controller may sequentially re-execute the first circulation line air removal mode and the second circulation line air removal mode.

The first and second heat exchangers further include a distributor temperature sensor that senses the temperature of the water from the heat exchanger, and an indoor temperature sensor that senses the temperature of the water inside the indoor unit, and the controller includes the temperature detected by the distributor temperature sensor and the indoor temperature sensor. If the difference in the detected temperature is greater than or equal to the set temperature, sub-air removal operation may be performed again.

When there are a plurality of indoor units, each of the plurality of indoor units includes an indoor unit temperature sensor, and the controller performs sub-air removal operation again in the case of an indoor unit in which the temperature difference between the indoor unit temperature sensor and the distributor temperature sensor is higher than the set temperature, and the indoor unit is In the case of an indoor unit in which the temperature difference between the temperature sensor and the distributor temperature sensor is less than the set temperature, the air removal operation may be terminated.

According to an embodiment of the present invention, after performing the main air removal operation, the sub-air removal operation is further performed to remove air by increasing the pressure in the water pipe than during the main air removal operation, thereby maximizing the air in the water pipe between the distributor and the indoor unit. By removing the furnace, it is possible to shorten the time for filling the water piping, and to minimize the case of damage to parts in the water piping by air during air conditioning.

According to an embodiment of the present invention, it is possible to easily check the balance of circulation lines formed by each circulation pump and whether air is removed from each circulation line by comparing RPMs of the circulation pumps in the distributor, and confirming results Accordingly, there is an advantage that the air removal operation can be performed again.

According to an embodiment of the present invention, it is possible to easily check whether air is removed from the inlet pipe of the indoor unit through comparison of the distributor temperature and the indoor unit temperature, and there is an advantage of removing air according to the confirmation result.

1 is a block diagram of an air conditioning system according to an embodiment of the present invention.
2 is a control block diagram of an air conditioning system according to an embodiment of the present invention.
3 is a flowchart illustrating a method of performing an air removal operation in an air conditioning system according to a first embodiment of the present invention.
4 is a flowchart illustrating a method of performing an air removal operation in an air conditioning system according to a second embodiment of the present invention.

Hereinafter, a specific embodiment of the present invention will be described in detail with the accompanying drawings.

1 is a block diagram of an air conditioning system according to an embodiment of the present invention.

The air conditioning system according to an embodiment of the present invention may include an outdoor unit 10, a distributor 30 connected to the outdoor unit 10, and at least one indoor unit 60 connected to the distributor 30.

A plurality of indoor units 60 may be provided, and the air conditioning system may control the outdoor unit 10 by a cooling subject operation or a heating subject operation according to a heating and cooling load required by the plurality of indoor units 60. It goes without saying that the air conditioning system is capable of operating the cooling and heating rooms or the heating and heating rooms.

The outdoor unit 10 may be connected to the distributor 30 and the high pressure engine 19, the low pressure engine 20, and the liquid pipe 21.

The outdoor unit 10 may include a compressor 11, an outdoor heat exchanger 16, a first outdoor oblique side 15, a second outdoor oblique side 18, and an outdoor expansion mechanism 17.

The compressor 11 may be an inverter compressor whose operating frequency is controlled. The suction pipe 13 and the discharge pipe 12 may be connected to the compressor 11. The refrigerant sucked into the compressor 11 through the suction pipe 13 may be compressed in the compressor 11 and discharged to the discharge pipe 12.

An accumulator 14 for separating the gaseous refrigerant and the liquid refrigerant may be installed in the suction pipe 13, and the gaseous refrigerant may be sucked into the compressor 11.

The outdoor heat exchanger 16 heat exchanges with the air blown by the outdoor fan and condenses or evaporates the refrigerant. The outdoor fan may be included in the outdoor unit 10.

A liquid pipe 21 may be connected to the outdoor heat exchanger 16. In more detail, with respect to the flow path of the refrigerant, one side of the outdoor heat exchanger 16 may communicate with the first outside four sides 15 and the other side may be connected with the liquid pipe 21.

The first outdoor four sides 15 may selectively communicate the outdoor heat exchanger 16 with the suction pipe 13 or the discharge pipe 12. The second outdoor oblique side 18 may selectively communicate the high-pressure engine 19 with the suction pipe 13 or the discharge pipe 12.

Meanwhile, since the outdoor unit 10 illustrated in FIG. 1 is merely an example for convenience of description, the outdoor unit 10 further includes other components in addition to the components illustrated in FIG. 1 or some components are omitted You may.

On the other hand, the indoor unit 60 may perform cooling or heating operation by water distributed by heat exchange with a refrigerant in the distributor 30. A plurality of indoor units 60 may be provided.

Each indoor unit 60 may be connected to the distributor 30 by an inlet pipe 45 and an outlet pipe 46. The heated or cooled water exchanged in the distributor 30 flows to the indoor unit 60 through the inlet pipe 45, and the water heated or cooled in the indoor unit 60 is distributed through the outlet pipe 46. 30).

Each indoor unit 60 may include an indoor heat exchanger 61. In the indoor heat exchanger (61), the heated or cooled water passes through heat exchange with the refrigerant in the distributor (30), and the air blown by an indoor fan (not shown) included in the indoor unit (60) is an indoor heat exchanger (61). In the heat exchange with water can be performed for indoor heating or cooling.

The indoor heat exchanger 61 may be connected to the inlet pipe 45 and the outlet pipe 46.

In addition, an indoor unit temperature sensor 62 may be provided in each indoor unit 60. The indoor unit temperature sensor 62 may detect the temperature of water passing through the indoor unit 60.

The indoor unit temperature sensor 62 may be installed inside the indoor unit 60. The indoor unit temperature sensor 62 is preferably installed on the water passage passing through the indoor unit 60. It is preferable that the indoor unit temperature sensor 62 detects the water temperature before heat exchange in the indoor heat exchanger 61.

In addition, each indoor unit 60 may be provided with a communication unit (not shown) capable of communicating with the distributor 30.

Meanwhile, the distributor 30 may heat exchange the refrigerant introduced from the outdoor unit 10 with water, and distribute the heat-exchanged water to each indoor unit 60.

The distributor 30 includes a heat exchanger 31, 36, four sides 32, 37, an expansion mechanism 33, 38, a flow valve 51, 52, and a three-way valve 53 It may include.

The distributor 30 may include a plurality of heat exchangers 31 and 36 for exchanging refrigerant and water. Each heat exchanger (31, 36) may function as an evaporator or condenser depending on the heating and cooling load of the indoor unit (60). When water is heated in the heat exchanger (31) (36), the refrigerant may be condensed in the heat exchanger (31) (36), and when water is cooled in the heat exchanger (31) (36), the refrigerant is a heat exchanger (31). ) 36.

With respect to the flow direction of the refrigerant, one side of the heat exchanger (31) (36) can be selectively communicated with the high pressure engine (19) or the low pressure engine (20) by the four sides (32, 37). In more detail, when the heat exchanger (31, 36) is in communication with the high pressure engine (19) by four sides (32, 37), the heat exchanger (31, 36) is a condenser that heats the water and condensing the refrigerant When the heat exchanger (31) (36) is in communication with the low-pressure engine (20) by four sides (32) (37), the refrigerant is evaporated and may function as an evaporator that cools water.

The other side of the heat exchanger (31, 36) may be in communication with the liquid pipe (21) is installed expansion mechanism (33) (38). When the heat exchanger 31, 36 functions as a condenser, the expansion mechanism 33, 38 can be fully open, and when the heat exchanger 31, 36 functions as an evaporator, the expansion mechanism 33, 38 ) Can be controlled to a preset setting opening.

In addition, the inlet pipes 42 and 44 and the outlet pipes 41 and 43 may be connected to each heat exchanger 31 and 36. Water introduced into the heat exchangers 31 and 36 through the inlet pipes 42 and 44 may be heat-exchanged with a refrigerant in the heat exchangers 31 and 36 and discharged to the outlet pipes 41 and 43.

A circulation pump (35) (40) may be installed in the inlet pipe (42) (44), and the circulation pump (35) (40) may supply water between each heat exchanger (31) (36) and the indoor unit (60). Can be cycled.

The circulation pump 35 and 40 may include a first circulation pump 35 and a second circulation pump 40, and the first circulation pump 35 includes a first heat exchanger 31 and an indoor unit 60 Water circulates therebetween, and the second circulation pump 40 can circulate water between the second heat exchanger 36 and the indoor unit 60.

In addition, a water tank (not shown) may be connected to the water inlet pipes 42 and 44, and water from the water tank (not shown) may be sucked into the water inlet pipes 42 and 44 by the circulation pumps 35 and 40. Can be. Between the water tank (not shown) and the intake pipes 42 and 44, a water supply valve 39 for controlling the water supply of the water tank (not shown) may be provided.

The plurality of flow valves 51 and 52 and the three-way valve 53 may distribute water heat-exchanged in each heat exchanger 31 and 36 to each indoor unit 60.

The flow valves 51 and 52 may communicate or separate the inlet pipe 45 of each indoor unit 60 from the outlet pipes 41 and 43 of each heat exchanger 31 and 36.

The three-way valve 53 may selectively communicate the outlet pipe 46 of each indoor unit 60 with any one of the inlet pipes 42 and 44 of each heat exchanger 31 and 36.

Hereinafter, the case where the heat exchangers 31 and 36 of the distributor 30 include the first heat exchanger 31 and the second heat exchanger 36, and four indoor units 60 are connected to the distributor 30 It will be explained with an example.

The flow valves 51 and 52 are provided with a first flow valve 51 for communicating or separating the inlet pipe 45 of each indoor unit 60 with the first outlet pipe 41 of the first heat exchanger 31. , It may include a second flow valve 52 that communicates or separates the inlet pipe 45 of each indoor unit 60 with the second outlet pipe 43 of the second heat exchanger 36.

In addition, the three-way valve 53 is connected to the outlet pipe 46 of each indoor unit 60, the first inlet pipe 42 of the first heat exchanger 31 and the second inlet pipe of the second heat exchanger 36 ).

In more detail, the inlet pipe 45 connected to the indoor unit 60 includes a first outlet pipe 41 connected to the first heat exchanger 31 or a second outlet pipe 43 connected to the second heat exchanger 36. Can communicate.

The first outlet pipe 41 is the first common outlet pipe 41A connected to the first heat exchanger 31, and the first common outlet pipe 41A branched in the same number as the number of indoor units 60 It may include a branch water discharge pipe (41B). Each first branch outlet pipe 41B may be in communication with the inlet pipe 45 of each indoor unit 60, and the first flow valve 51 may be installed in each first branch outlet pipe 41B. That is, each of the first branch discharge pipe 41B and the first flow valve 51 may be provided with four.

The second outlet pipe 43 is the second common outlet pipe (43A) connected to the second heat exchanger (36), and the second common outlet pipe (43A), the number of indoor units 60 branched to the same number It may include a branch water discharge pipe (43B). Each second branch outlet pipe 43B may be in communication with the inlet pipe 45 of each indoor unit 60, and a second flow valve 52 may be installed in each second branch outlet pipe 43B. That is, the second branch water discharge pipe 43B and the second flow valve 51 may each be provided with four.

In addition, the outlet pipe 46 connected to the indoor unit 60 may be in communication with the first inlet pipe 42 connected to the first heat exchanger 31 or the second inlet pipe 44 connected to the second heat exchanger 36. Can be.

The first intake pipe 42 is the first common inlet pipe 42A connected to the first heat exchanger 31, and the first common inlet pipe 42A branched in the same number as the number of indoor units 60 It may include a branch inlet pipe (42B). That is, four first branch inlet pipes 42B may be provided. Each first branch inlet pipe 42B may be selectively communicated with an outlet pipe 46 of each indoor unit 60 by a three-way valve 53.

A first circulation pump 35 may be installed in the first intake pipe 42. In more detail, the first circulation pump 35 may be installed in the first common inlet pipe 42A.

The second intake pipe 44 is a second common inlet pipe 44A connected to the second heat exchanger 36, and the second common inlet pipe 44A branched to the same number as the number of indoor units 60 It may include a branch inlet pipe (44B). That is, four of the second branch intake pipes 44B may be provided. Each second branch inlet pipe 44B may be selectively communicated with the outlet pipe 46 of each indoor unit 60 by a three-way valve 53.

A second circulation pump 40 may be installed in the second intake pipe 44. In more detail, the second circulation pump 40 may be installed in the second common inlet pipe 44A.

Four three-way valves 53 may be provided. That is, the first flow valve 51, the second flow valve 52 and the three-way valve 53 may be provided to correspond to one for each indoor unit 60.

In summary, each first flow valve 51 regulates the flow of water flowing from the first heat exchanger 31 to each indoor unit 60, and each second flow valve 52 has a second heat exchanger 36 The flow of water flowing into each indoor unit 60 may be controlled.

One of the first flow valve 51 and the second flow valve 52 corresponding to any one indoor unit 60 may be opened, and the other may be closed.

On the other hand, the distributor 30 may be provided with a communication unit (not shown) capable of communicating with each indoor unit 60.

The distributor 30 may further include first and second distributor temperature sensors 81 and 83 that sense the outlet temperature of the water exchanged with the refrigerant in the first and second heat exchangers 31 and 36.

The first distributor temperature sensor 81 is installed in the first common outlet pipe 41A through which water discharged from the first heat exchanger 31 passes, and the second distributor temperature sensor 83 is the second heat exchanger 36 ) May be installed in the second common outlet pipe 43A through which the water discharged passes.

Meanwhile, a purge valve 63 may be installed in the indoor unit 60. The purge valve 63 may discharge the air contained in the water pipe in which the purge valve 63 is installed out of the pipe.

The purge valve 63 may be opened while performing the air removal operation, and may be closed when the air removal operation ends. The opening rate of the purge valve 63 may be adjusted, and the pressure in the pipe in which the purge valve 63 is installed may increase as the opening rate decreases.

The purge valve 63 may be installed at the inlet of the indoor unit 60. The purge valve 63 is preferably installed in the indoor unit inlet pipe (45).

The air conditioning system according to an embodiment of the present invention may perform an air removal operation to remove air included in a water channel between the distributor 30 and the indoor unit 60. The air conditioning system may perform an air removal operation at the time of installation or repair / replacement of at least one pipe.

Meanwhile, the air conditioning system may further include an outdoor unit 10, a distributor 30, and a controller 90 for controlling the indoor unit 60.

The controller 90 may control each of the outdoor unit 10, the distributor 30, and the indoor unit 60. The controller 90 may control the air conditioning system to perform an air removal operation.

Next, FIG. 2 is a control block diagram of an air conditioning system according to an embodiment of the present invention.

The controller 90 includes a first circulation pump 35, a second circulation pump 40, a first flow valve 51, a second flow valve 52, a three-way valve 53, a purge valve 63, and a timer (88), the distributor temperature sensor 81, 83 and the indoor unit temperature sensor 62 can be controlled respectively.

The first circulation pump 35 may flow water flowing through the first inlet pipe 42 through the three-way valve 53 to the first heat exchanger 31. Accordingly, a first circulation line is formed between the distributor 30 and the indoor unit 60, and the first circulation line is the first heat exchanger 31, the first outlet pipe 41, and the inlet pipe of the indoor unit 60 (45), the indoor unit 60, it may be a circulation path of water passing through the inlet pipe (42) (44) sequentially.

The second circulation pump 40 may flow water flowing through the second inlet pipe 44 through the three-way valve 53 to the second heat exchanger 36. Accordingly, a second circulation line is formed between the distributor 30 and the indoor unit 60, and the second circulation line is a second heat exchanger 36, a second outlet pipe 43, and an inlet pipe of the indoor unit 60. (45), the indoor unit 60, it may be a circulation path of water passing through the inlet pipe (42) (44) sequentially.

The first flow valve 51 may control water flowing into the indoor unit 60 from the first heat exchanger 31. The first flow valve 51 may be installed in the first outlet pipe 41. The first flow valve 51 may be full open or full closed, and water discharged from the first heat exchanger 31 when the first flow valve 51 is fully open is an indoor unit ( 60), the flow of water from the first heat exchanger (31) to the indoor unit (60) can be blocked when the first flow valve (51) is fully closed.

The second flow valve 52 may control water flowing into the indoor unit 60 from the second heat exchanger 36. The second flow valve 52 may be installed in the second outlet pipe 43. The second flow valve 52 may be full open or full closed, and water discharged from the second heat exchanger 36 when the second flow valve 52 is full open is an indoor unit ( 60), the flow of water from the second heat exchanger 36 to the indoor unit 60 when the second flow valve 51 is fully closed may be blocked.

The three-way valve 53 may guide water flowing in the indoor unit 60 to at least one of the first heat exchanger 31 and the second heat exchanger 36. Specifically, the controller 90 includes the first and second inlet piping 42 of the first and second heat exchangers 31 and 36 of the outlet piping 46 of the indoor unit 60 during the cooling operation or the heating operation. 44) it is possible to control the three-way valve 53 to selectively communicate with any one of. On the other hand, the controller 90 has the outlet pipe 46 of the indoor unit 60 during the air removal operation, and the first and second intake pipes 42 and 44 of the first and second heat exchangers 31 and 36 The three-way valve 53 can be controlled to communicate with each other.

That is, the three-way valve 53 is three-way open (3) through which the water passing through the outlet pipe 46 of the indoor unit 60 flows to the first inlet pipe 42 and the second inlet pipe 44 respectively during air removal operation (3) -way open).

When the three-way valve 53 is controlled in the three-way open state, the inlet in the first inlet pipe 42 direction and the inlet in the second inlet pipe 44 direction may be half-opened, respectively. When the three-way valve 53 communicates the outlet pipe 46 with the first inlet pipe 42, the inlet in the first inlet pipe 42 direction is 100% open, and the inlet in the second inlet pipe 44 direction is 100%. When the three-way valve 53 is closed, and the outlet pipe 46 communicates with the second inlet pipe 44, the second inlet pipe 44 direction inlet is 100% open, and the first inlet pipe 42 direction inlet Is 100% closed, and when the three-way valve 53 communicates the outlet pipe 46 with both the first and second inlet pipes 42 and 44, the inlet to the first inlet pipe 42 is opened 50%. , The entrance to the second inlet pipe 44 may be 50% open.

The purge valve 63 may be opened during the air removal operation, and closed during the cooling operation or the heating operation.

The controller 90 opens the purge valve 63 during the air removal operation, and can control the opening ratio. For example, the controller 90 performs the main air removal operation in a state where the purge valve 63 is fully opened, and primarily removes air contained in the water channel, and then lowers the opening ratio of the purge valve 63 to lower the inside of the water channel. By increasing the pressure, air remaining in the water channel can be removed even after the primary removal.

The timer 88 may count the operating time of the air conditioning system. When performing a specific operation, the controller 90 may control to operate for a predetermined time through the timer 88.

The distributor temperature sensors 81 and 83 may detect the temperature of the water that has passed through the heat exchangers 31 and 36. The distributor temperature sensor 81 and 83 include a first distributor temperature sensor 81 and a second distributor temperature sensor 83, and the first distributor temperature sensor 81 passes through the first heat exchanger 31. The temperature of the water is sensed, and the second distributor temperature sensor 83 can detect the temperature of the water passing through the second heat exchanger 36.

The first distributor temperature sensor 81 may be installed in the first outlet pipe 41 and the second distributor temperature sensor 83 may be installed in the second outlet pipe 43.

The controller 90 may receive the temperature sensed by the indoor unit temperature sensor 62 and acquire the temperature of the water passing through the indoor unit 60.

3 is a flowchart illustrating a method of performing an air removal operation in an air conditioning system according to a first embodiment of the present invention.

The controller 90 may start an air removal operation (S11).

The controller 90 may start an air removal operation after the installation of the air conditioning system is completed. Alternatively, the controller 90 may start an air removal operation after repair or replacement of the water pipe between the distributor 30 and the indoor unit 60. However, this is only an example, and the controller 90 may initiate an air removal operation in various situations other than those listed above.

The controller 90 may start an air removal operation by receiving an air removal operation command from an operator through an input unit (not shown).

When the air removal operation is started, the controller 90 may perform the main air removal operation and the sub air removal operation, respectively.

The main air removal operation is an operation that primarily removes air included in the water pipe between the first and second heat exchangers 31, 36 and the indoor unit 60, and the sub air removal operation is performed even after the primary removal. It may be an operation for secondaryly removing air remaining in the water pipe between the first and second heat exchangers 31 and 36 and the indoor unit 60.

First, the method in which the controller 90 performs the main air removal operation will be described.

When the main air removal operation is performed, the controller 90 fully closes the second flow valve 52 for a set time, and the first circulation line air removal mode for pulling on the first flow valve 51 and the first for a set time. A second circulation line air removal mode in which the flow valve 51 is fully closed and the second flow valve 52 is pulled on may be performed.

Specifically, in the first circulation line air removal mode, the controller 90 fully opens the purge valve 63 for the first set time, opens the first flow valve 51, and opens the second flow valve 52 ) Is fully closed, and the first and second circulation pumps 35 and 40 can be turned on (S12).

Accordingly, water is circulated along a first circulation line including a first heat exchanger 31, a first water discharge pipe 41, an indoor unit 60, and an intake pipe 42, 44 for a first set time. , When circulating water, air contained in water may be discharged out of the water pipe through the purge valve 63.

The controller 90 may perform the first circulation line air removal mode for a predetermined time, and then perform the second circulation line air removal mode.

In the second circulation line air removal mode, the controller 90 fully opens the purge valve 63 for the first set time, closes the first flow valve 51, and releases the second flow valve 52. It is opened, and the first and second circulation valves 35 and 40 can be turned on (S13).

Accordingly, water is circulated along the second circulation line including the second heat exchanger 36, the second outlet pipe 43, the indoor unit 60, and the inlet pipe 42, 44 during the first set time. , When circulating water, air contained in water may be discharged out of the water pipe through the purge valve 63.

The operation time in the first circulation line air removal mode may be the same as the operation time in the second circulation line air removal mode. That is, each of the operation time in the first circulation line air removal mode and the second circulation line air removal mode may be the first set time. For example, the first set time may be 10 minutes, but this may vary depending on the length and thickness of the water pipe forming the first circulation line.

In this way, the air conditioning system according to an embodiment of the present invention can remove air by forming a plurality of water channels as in the first circulation line and the second circulation line during the air removal operation. Accordingly, the air included in the plurality of water pipes connected between the distributor 30 and the indoor unit 60 can be removed without fail.

On the other hand, in the controller 90, the first circulation line air removal mode and the second circulation line air removal mode, the outlet pipe 46 of the indoor unit 60 is provided with the first and second intake pipes 42 and 44. It is possible to control the first three-way valve 53 so that they are all in communication, and both the first and second circulation pumps 35 and 49 can be turned on.

However, according to an embodiment, the controller 90 may provide the first three-way valve 53 so that the outlet pipe 46 of the indoor unit 60 communicates with the first inlet pipe 42 in the first circulation line air removal mode. The first three-way valve is controlled so that only the first circulation pump 35 is turned on and the outlet pipe 46 of the indoor unit 60 communicates with the second inlet pipe 44 in the second circulation line air removal mode. 53), and only the second circulation pump 40 can be controlled.

On the other hand, after performing the main air removal operation, the controller 90 may compare the RPM of the first circulation pump 35 and the RPM of the second circulation pump 40 to check whether air remains.

Specifically, the circulation pump (35, 40) is a pump for circulating water, and when the air passing through the circulation pump (35, 40) contains air, RPM (revolution per) of the circulation pump (35, 40) minute) may be lower than the RPM of the circulation pump (35, 40) when air is not included in the water passing through the circulation pump (35, 40). Accordingly, when the difference between the RPM of the first circulation pump 35 and the RPM of the second circulation pump 40 is large, it may be determined that air is present in the first circulation line or the second circulation line.

Accordingly, the controller 90 may determine whether the difference between the RPM of the first circulation pump 35 and the RPM of the second circulation pump 40 is equal to or less than the reference value (S14).

According to the first embodiment of the present invention, when the RPM difference between the RPM of the first circulation pump 35 and the RPM of the second circulation pump 40 exceeds a reference value, the controller 90 is connected to the first circulation line or the second circulation line. It is determined that air is present, and each of the first circulation line air removal mode S12 and the second circulation line air removal mode S13 may be sequentially executed again.

Meanwhile, if the difference between the RPM of the first circulation pump 35 and the RPM of the second circulation pump 40 is less than or equal to a reference value, the controller 90 may perform a sub-air removal operation.

The sub-air removal operation may be an operation of removing air by increasing the pressure inside the water pipe than during the main air removal operation.

The controller 90 lowers the opening rate of the purge valve 63 during the sub-air removal operation to be lower than the opening rate of the purge valve 63 during the main air removal operation, so that the inside of the water pipe between the heat exchanger 31, 36 and the indoor unit 60 It is possible to remove the air by forming a water channel while the pressure is increased.

Specifically, during the sub-air removal operation, the controller 90 controls the purge valve 63 to a set opening for a second set time, and the first flow valve 51 is fully opened and the second flow valve 52 is opened. The full closed, first and second circulation pumps 35 and 40 may be on-controlled (S15).

The controller 90 may control the purge valve 63 to a set opening during sub-air removal operation. Here, the setting opening degree may be lower than the opening degree during the main air removal operation. For example, when the main air removal operation, the purge valve 63 may be opened and closed at full open (100%), and during the sub-air removal operation, the purge valve 63 may be opened at the set opening rate (60%). .

During the sub-air removal operation, as the opening degree of the purge valve 63 is lowered, the pressure in the water pipe between the heat exchanger 31, 36 and the indoor unit 60 is increased, so that the air flows out more than during the main air removal operation. More can be released.

The controller 90 may operate the sub-air removal during the second set time. The second set time may be 20 minutes, but this is only exemplary, and may be adjusted in proportion to the first set time.

After performing the sub-air removal operation, the controller 90 may determine whether the difference between the distributor temperature and the indoor unit temperature is less than the set temperature (S16).

Here, the distributor temperature is the temperature of the water discharged from the heat exchangers 31 and 36, and may be the temperature of the water sensed by the first and second distributor temperature sensors 81 and 83. The indoor unit temperature is the temperature of the water passing through the indoor unit 60 and may be the temperature of the water detected by the indoor unit temperature sensor 62.

The more air is present in the water pipe, the more water flowing along the water pipe may cause heat loss. Therefore, the more air in the inlet pipe 45 of the indoor unit 60, the greater the difference between the distributor temperature and the indoor unit temperature. Accordingly, the controller 90 may predict the amount of air included in the inlet pipe 45 of the indoor unit 60 based on the difference between the distributor temperature and the indoor unit temperature.

The controller 90 may determine that there is a lot of air in the inlet pipe 45 of the indoor unit 60 when the difference between the distributor temperature and the indoor unit temperature is greater than or equal to the set temperature, and may perform the sub-air removal operation again.

Meanwhile, the controller 90 may end the air removal operation when the difference between the distributor temperature and the indoor unit temperature is less than the set temperature (S17).

That is, when the difference between the distributor temperature and the indoor unit temperature is less than the set temperature, the controller 90 determines that air is present in the inlet pipe 45 of the indoor unit 60 below a reference amount, and may terminate the air removal operation.

After completing the air removal operation, the controller 90 may determine that it is normally installed.

As described above, according to the first embodiment of the present invention, the controller 90 when the difference between the RPM of the first circulation pump and the RPM of the second circulation pump exceeds a set value, the first circulation line air removal mode and the second Each of the circulation line air removal modes can be re-executed. That is, according to the first embodiment, when it is determined that the difference between the RPM of the first circulation pump and the RPM of the second circulation pump exceeds the set value, the controller 90 removes air from the first and second circulation lines without separate control. By executing the mode again, the control operation can be simplified.

On the other hand, according to the second embodiment of the present invention, the controller 90, when the difference between the RPM of the first circulation pump and the RPM of the second circulation pump exceeds a set value, air in the first circulation line and the second circulation line is further added. It is also possible to conduct an air removal mode by searching for many circulation lines.

4 is a flowchart illustrating a method of performing an air removal operation in an air conditioning system according to a second embodiment of the present invention.

The controller 90 starts the air removal operation (S21), fully opens the purge valve 63 for the first set time, opens the first flow valve 51, and opens the second flow valve 52. Full-closed, the first and second circulation pumps 35 and 40 are subjected to a first circulation line air removal mode for on-control (S22), and the purge valve 63 is fully opened for a first set time, The first flow valve 51 is fully closed, the second flow valve 52 is fully opened, and a second circulation line air removal mode is performed to turn on and control the first and second circulation valves 35 and 40. It can be done (S23).

Since steps S21 to S23 are the same as steps S11 to S13 shown in FIG. 3, detailed description will be omitted.

If the difference between the RPM of the first circulation pump 35 and the RPM of the second circulation pump 40 exceeds the reference value (S24), the controller 90 may determine whether the RPM of the first circulation pump is greater than the RPM of the second circulation pump. Yes (S25).

The controller 90 may calculate the RPM by predicting the pump head according to the capacity of the indoor unit.

If the RPM of the first circulation pump 35 is faster than the RPM of the second circulation pump 40, the controller 90 may re-execute the second circulation line air removal mode (S23). That is, when the RPM of the first circulation pump 35 is faster than the RPM of the second circulation pump 40, the controller 90 re-executes only the second circulation line air removal mode, and the first circulation line air removal mode is restarted. You may not.

Meanwhile, if the RPM of the first circulation pump 35 is equal to or less than the RPM of the second circulation pump 40, the controller 90 may re-execute the first circulation line air removal mode (S26). Likewise, if the RPM of the first circulation pump 35 is equal to or less than the RPM of the second circulation pump 40, the controller 90 re-executes the first circulation line air removal mode and the second circulation line air removal mode again. You may not.

That is, unlike the first embodiment, it is not necessary to perform both the first and second circulation line air removal modes, and accordingly, there is an advantage of minimizing the time spent in re-running the circulation line air removal mode. .

If the difference between the RPM of the first circulation pump 35 and the RPM of the second circulation pump 40 is less than or equal to a reference value, the controller 90 controls the purge valve 63 to a set opening amount for a second set time, and the first flow valve It is possible to perform a sub-air removal operation in which (51) is fully opened, the second flow valve (52) is fully closed, and the first and second circulation pumps (35, 40) are on-controlled.

After performing the sub-air removal operation, the controller 90 determines whether the difference between the distributor temperature and the indoor unit temperature is less than the set temperature (S28), and when the difference between the distributor temperature and the indoor unit temperature is greater than the set temperature, performs the sub-air removal operation again, When the difference between the distributor temperature and the indoor unit temperature is less than the set temperature, the air removal operation may be terminated (S29).

Since steps S27 to S29 are the same as steps S15 to S17 shown in FIG. 3, detailed description will be omitted.

Thus, when the air conditioning system removes air in the water pipe, there is an advantage that can shorten the time to fill the water pipe. In addition, by removing the air in the water pipe, the air conditioning system has the advantage of improving the reliability of the product by minimizing the case where the circulation pump or the like is damaged by air during cooling or heating operation.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention.

Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments.

The scope of protection of the present invention should be interpreted by the claims below, and all technical spirits within the equivalent range should be interpreted as being included in the scope of the present invention.

35, 40: first and second circulation pumps
51, 52: first and second flow valves
53: three-way valve
62: indoor unit temperature sensor
63: purge valve
81, 83: distributor temperature sensor
88: timer
90: controller

Claims (9)

Outdoor unit;
A distributor including first and second heat exchangers for heat-exchanging the refrigerant flowing in the outdoor unit with water;
An indoor unit connected to the distributor;
A first circulation pump circulating water between the first heat exchanger and the indoor unit;
A second circulation pump circulating water between the second heat exchanger and the indoor unit;
A purge valve installed at the inlet of the indoor unit; And
The main air removal operation for removing air contained in the water pipe between the first and second heat exchangers and the indoor unit and the opening rate of the purge valve are controlled to be lower than the opening rate of the purge valve during the general air removal operation. An air conditioning system comprising a controller that performs a sub-air removal operation to remove air. According to claim 1,
The controller
The air conditioning system that starts the main air removal operation and performs the sub air removal operation when the difference between the RPM of the first circulation pump and the RPM of the second circulation pump is equal to or less than a set value. According to claim 1,
A first flow valve controlling water flowing from the first heat exchanger to the indoor unit;
A second flow valve controlling water flowing from the second heat exchanger to the indoor unit;
Further comprising a three-way valve for guiding the water flowing in the indoor unit to at least one of the first heat exchanger and the second heat exchanger,
The controller
An air conditioning system that controls the three-way valve to guide water flowing from the indoor unit to each of the first and second heat exchangers during the main air removal operation. According to claim 3,
The controller
An air conditioning system that fully opens the first flow valve and the second flow valve during the sub-air removal operation. According to claim 3,
The controller
When the main air removal operation,
A first circulation line air removal mode for closing the second flow valve for a set time and pulling on the first flow valve;
An air conditioning system that performs a second circulation line air removal mode that fully closes the first flow valve and pulls the second flow valve during the set time. The method of claim 5,
The controller
When the difference between the RPM of the first circulation pump and the RPM of the second circulation pump exceeds a set value, the second circulation line air removal mode is restarted when the RPM of the first circulation pump is faster than the RPM of the second circulation pump. And, if the RPM of the second circulation pump is faster than the RPM of the first circulation pump, the air conditioning system to perform the first circulation line air removal mode again. The method of claim 5,
The controller
If the difference between the RPM of the first circulation pump and the RPM of the second circulation pump exceeds a set value, the air conditioning system sequentially performs the first circulation line air removal mode and the second circulation line air removal mode. According to claim 1,
A distributor temperature sensor for sensing the temperature of the water from each of the first and second heat exchangers;
Further comprising an indoor unit temperature sensor for detecting the temperature of the water inside the indoor unit,
The controller
If the difference between the temperature sensed by the distributor temperature sensor and the temperature sensed by the indoor temperature sensor is greater than or equal to the set temperature, the air conditioning system re-executes the sub-air removal operation. The method of claim 8,
When the indoor unit is plural, each of the plurality of indoor units includes an indoor unit temperature sensor,
The controller
If the temperature difference between the indoor indoor temperature sensor and the distributor temperature sensor is greater than or equal to the set temperature, the sub-air removal operation is performed again. Air conditioning system to end operation.

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