KR100819626B1 - Air Conditioner with Multiple Compressors - Google Patents

Abstract

The present invention blocks the flow of refrigerant so that the refrigerant discharged from the continuous compressor does not flow into the intermittent compressor when the intermittent compressor is stopped from among the plurality of compressors, and the intermittent compressor is configured as one independent refrigerant circulation system to reduce the pressure balance of the refrigerant in a short time. It is an object of the present invention to provide an air conditioner having a plurality of compressors capable of stably driving a plurality of compressors. The technical configuration of the air conditioner having a plurality of compressors including an intermittent compressor and a continuous compressor having different capacities, the refrigerant supplied from the first accumulator (120a) through the flow change means 130, the condenser ( An intermittent compressor (110a) for supplying to 170; A continuous compressor (110b) for supplying the refrigerant supplied from the second accumulator (120b) to the condenser (170); The refrigerant circulated through the cooling line (condenser-expansion valve-evaporator) is collected and directly supplied to the second accumulator 120b, and the remaining refrigerant is supplied to the first accumulator 120a through the flow change means 130. Giving the common receiver 180; And a flow changing means 130 for switching the flow of the refrigerant according to whether the intermittent compressor 110a is started or not, and the flow changing means 130 is stopped when the intermittent compressor 110a stops. The flow path is switched so that the intermittent compressor 110a and the first accumulator 120a can be configured as one independent refrigerant circulation system.

Refrigerant, oil, evaporator, suction part, discharge part, refrigerant circulation amount, flow changing means.

Description

Air conditioner with multiple compressors {AIR CONDITIONER WITH MULTI COMPRESSORS}

1 is a block diagram showing a conventional air conditioner having a plurality of compressors.

2 is a configuration diagram showing a case where all the compressors of the air conditioner with a plurality of compressors according to the present invention are in an On state.

3 is a configuration diagram illustrating a case where an intermittent compressor is in an off state among compressors of an air conditioner including a plurality of compressors according to the present invention;

** Explanation of symbols for main parts of the drawing **

100: air conditioner, 110a: intermittent compressor,
110b: continuous compressor, 120a, 120b: first and second accumulator,

130: flow change means, 131 ~ 134: 1 ~ 4 port,

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140: check valve, 150: evaporator,

160: expansion valve, 170: condenser.

The present invention relates to an air conditioner having a plurality of compressors. More specifically, when the intermittent compressor is not driven, the intermittent compressor can be configured as an independent refrigerant circulation system to shorten the pressure balance time of the refrigerant, The present invention relates to an air conditioner having a plurality of compressors capable of varying the cooling capacity according to a load so as to improve oil even distribution in proportion to a refrigerant circulation amount and to improve the restartability of an intermittent compressor.

An air conditioner is a device for controlling air temperature, humidity, airflow, and cleanliness to create a comfortable indoor environment. Recently, a plurality of compressors are provided in an outdoor unit to effectively respond to required cooling capacity. An air conditioner with a compressor is used.

1 is a configuration diagram of an air conditioner having a plurality of conventional compressors.

As shown, a conventional air conditioner includes a plurality of compressors 20: 20a and 20b, discharge pipes 21a and 21b provided in each of the compressors 20a and 20b to guide compressed gas refrigerant. And oil separators 22a and 22b provided at the end of each discharge tube 21a and 21b to separate the gas refrigerant and the oil flowing out from the compressor, and the gas refrigerant passing through the oil separators 22a and 22b together. Connecting pipe 23 for guiding the refrigerant circulated to the condenser 30, the expansion valve 40 and the evaporator 50, and the suction pipe branched from the connecting pipe so that refrigerant passing through the evaporator 50 is branched into each compressor Accumulators 60a and 60b provided on the suction pipes 24a and 24b and capable of storing excess refrigerant generated according to the operating capacity of the compressors 20a and 20b, and the oil separator 22a. 22b) communicates with the suction pipes 24a and 24b to guide the oil filtered in the oil separators 22a and 22b to the suction pipes 24a and 24b. To drop the multiple pressure and includes a capillary tube (25a, 25b).

In addition, a check valve for preventing a backflow to prevent the refrigerant formed at a high temperature and high pressure through the compressors 20a and 20b from flowing back to the compressors 20a and 20b is provided on the discharge pipes 21a and 21b of the compressors 20: 20a and 20b. Installed in

In the air conditioner, the air conditioner sends the high temperature and high pressure refrigerant from the compressor located in the outdoor side to the condenser, condenses it to medium temperature and high pressure, expands the low temperature low pressure refrigerant in the expansion valve, and then supplies it to the evaporator. At this time, in the evaporator located on the indoor side, heat exchange is performed between the refrigerant and the indoor air, and the refrigerant absorbing heat is sent to the accumulator on the outdoor side and then sent to the compressor to be compressed. Cooling is achieved by repeating this process.
If the user's set temperature is reached or the set temperature of the room is increased during cooling, the air conditioner detects this and drives the compressors among the plurality of compressors 20a and 20b or simultaneously.

In addition, when it is desired to operate simultaneously or independently due to the change in the indoor cooling load, the stopped compressor must be restarted to switch the operation. To this end, the inside of the compression chamber of the compressor is to maintain the pressure balance, in this case, the discharge and suction pipes of the compressor to control the pressure balance using a control device such as a solenoid valve.

In addition, the accumulator forms a refrigerant accommodating space therein so that only the gas refrigerant in the mixed state refrigerant from the evaporator flows into the suction side of each compressor and simultaneously supplies oil proportional to the refrigerant suction amount of each compressor.

However, in the conventional air conditioner, when a high load occurs, when a plurality of compressors are operated simultaneously and reach a certain load, one compressor stops and the other continues to operate. At this time, the discharge tube refrigerant pressure of the stopped compressor is It is rapidly reduced and is formed almost in equilibrium with the refrigerant pressure in the suction pipe, but the time required to reach the pressure equilibrium between the suction pipe pressure and the discharge pipe pressure is considerably long in several tens of minutes and varies depending on the compressor capacity and the system operating conditions. .

In addition, since the stationary compressor cannot be operated until the pressure equilibrium is reached, it is impossible to immediately operate a compressor having a compression capacity suitable for fluctuations in the indoor load, and thus it is impossible to provide a cooling capacity equivalent to the required indoor load.

In addition, the time to reach the pressure balance varies according to the system operating conditions and the compressor capacity. Therefore, a sufficient safety time must be taken into consideration in the actual system design, and under certain conditions, the compressor can be kept at a standstill despite the pressure balance. There was a problem.

In addition, power consumption is increased when all compressors are stopped and restarted to solve the above problems.

In addition, oil accumulates in the accumulator until the oil flowing through the inner wall of the pipe moves to the accumulator of the intermittent compressor and is restarted. In this case, as the oil shortage of the operated compressor occurs, the plurality of compressors are simultaneously operated. Not only does the power increase, but the system efficiency decreases, making it difficult to expect the effect of using multiple compressors.

The present invention has been made to solve the above problems, the intermittent compressor to block the flow of the refrigerant so that the refrigerant discharged from the continuous compressor does not flow into the intermittent compressor when the intermittent compressor is stopped, and the intermittent compressor is one independent refrigerant An object of the present invention is to provide an air conditioner having a plurality of compressors capable of stably driving a plurality of compressors by forming a circulation system to achieve a pressure balance of a refrigerant in a short time.

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In order to solve the above technical problem, an air conditioner having a plurality of compressors according to the present invention,
In an air conditioner having a plurality of compressors including an intermittent compressor and a continuous compressor having different capacities,
An intermittent compressor (110a) for supplying the refrigerant supplied from the first accumulator (120a) to the condenser (170) through the flow changing means (130);
A continuous compressor (110b) for supplying the refrigerant supplied from the second accumulator (120b) to the condenser (170);
The refrigerant circulated through the cooling line (condenser-expansion valve-evaporator) is collected and directly supplied to the second accumulator 120b, and the remaining refrigerant is supplied to the first accumulator 120a through the flow change means 130. Giving the common receiver 180; And
It includes a flow changing means 130 for switching the flow of the refrigerant depending on whether the intermittent compressor (110a) is activated,
When the intermittent compressor 110a stops, the flow changing means 130 switches the flow path so that the intermittent compressor 110a and the first accumulator 120a can be configured as one independent refrigerant circulation system. It features.

The refrigerant circulation system is characterized in that the pressure balance between the refrigerant is formed between the intermittent compressor (110a) and the first accumulator (120a).

In addition, a check valve 140 is provided between the flow changing means 130 and the common receiver 180 so that the refrigerant discharged from the continuous compressor 110b is the common receiver 180 when the intermittent compressor 110a is stopped. It is characterized by blocking the flow into.

In addition, the flow changing means is preferably constituted by a four-way valve. This, the flow changing means 130 is characterized in that the operation is switched to receive the electrical signal to control the stop and start of the intermittent compressor (110a).

The flow changing means 130 is characterized in that the operation is switched by the refrigerant pressure at the time of stopping and starting the intermittent compressor 110a.

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

2 is a configuration diagram showing a case in which all the compressors of the air conditioner with a plurality of compressors according to the present invention are in an On state, and FIG. 3 is air having a plurality of compressors according to the present invention. It is a block diagram which shows the case where an intermittent compressor is an off state among the compressors of a rough conditioner.

As shown, the air conditioner 100 having a plurality of compressors according to the present invention includes an intermittent compressor 110a and a continuous compressor 110b having different capacities. Here, the intermittent compressor (110a) refers to a compressor that is selectively limited by the cooling load, etc., the continuous compressor (110b) means a compressor that is continuously driven.
The intermittent compressor 110a receives the refrigerant from the first accumulator 120a and supplies the compressed refrigerant to the condenser 170 through the flow change means 130, and the continuous compressor 110b is provided from the second accumulator 120b. The refrigerant is supplied to supply the compressed refrigerant to the condenser 170. At this time, the refrigerant discharged from each of the compressors 110a and 110b is laminated and supplied to the condenser 170.
In addition, the present invention includes a common receiver 180 for collecting the refrigerant circulated through the cooling line and branched to the first and second accumulators (120a, 120b). Here, the cooling line means a circulation line of the refrigerant leading to the condenser 170-expansion valve 160-evaporator 150 through which the refrigerant flows except the compressor in a conventional air conditioner. In particular, in branching and supplying the refrigerant from the common receiver 180 to the compressors 110a and 110b, the refrigerant supplied to the first accumulator 120a is configured to be made through the flow changing means 130, and the second The refrigerant supply to the accumulator 120b is configured to be directly connected and supplied.
The flow changing means 130 describes an example of using a four-way valve provided with four ports 131 to 134 in a preferred embodiment of the present invention. The first port 131 is a discharge pipe port for combining with the refrigerant supplied from the continuous compressor 110b to supply the condenser 170, and the second port 132 is connected to the discharge port of the intermittent compressor 110a. to be. The third port 133 is a port connected to the first accumulator 120a and the fourth port 134 is a port connected to the common receiver 180.
The flow change means 130 connected in this way includes an intermittent compressor 110a, and when the plurality of compressors 110a and 110b are driven, the first port 131 and the second port 132 are connected. The third port 133 and the fourth port 134 are connected. In addition, when the intermittent compressor 110a is stopped, as illustrated in FIG. 3, the first port 131 and the fourth port 134 are connected, and the second port 132 and the third port 133 are connected to each other. Is connected.
In a preferred embodiment of the present invention, the flow changing means 130 is preferably used by applying a four-way solenoid valve or four-way pneumatic valve. This is to control the flow changing means 130, if there is an electrical signal for stopping the intermittent compressor (110a), so as to control the flow changing means 130 to be connected as shown in Figure 3 by this signal For sake. In addition, when the intermittent compressor 110a is stopped during startup, the flow of the flow changing means 130 can be switched as shown in FIG. 3 even with the refrigerant pressure at this time.
On the other hand, the present invention further comprises a check valve 140 to limit the flow of the refrigerant in the configuration of the independent refrigerant circulation system. The check valve 140 is mounted between the fourth port 134 of the flow change means 130 and the common receiver 180. At this time, the check valve 140 is mounted so that the refrigerant can be supplied only from the common receiver 180 toward the flow changing means 130.
Here, when the independent refrigerant circulation system is connected to the port of the flow change means 130 by stopping the intermittent compressor (110a), the intermittent compressor (110a) and the first accumulator (120a) is a closed circulation system It means this circulatory system. In this independent refrigerant circulation system, when the intermittent compressor 110a stops operating, the pressure of the refrigerant generated therein is circulated, and the pressure of the refrigerant circulation system is balanced in a short time.
Hereinafter, the operation of the present invention with reference to the accompanying drawings.
2 and 3 are views showing the start and stop states of the intermittent compressor (110a) according to the present invention, respectively.
When the air conditioner of the present invention is initially driven or when the cooling temperature of the room does not reach the set temperature, as shown in FIG. 2, the plurality of compressors 110a and 110b operate together.
At this time, the flow change means 130 is connected to the first port 131 and the second port 132, the third port 133 and the fourth port 134 is connected. Accordingly, the refrigerant discharged from each of the compressors 110a and 110b is laminated and directed to the condenser 170, and the refrigerant flows along the normal cooling line to cool.
The refrigerant heat exchanged in the evaporator 150 is collected in the common receiver 180, and this refrigerant is branched and supplied to each of the compressors 110a and 110b. At this time, the refrigerant supplied to the intermittent compressor 110a is supplied to the first accumulator 120a through the flow changing means 130, and the refrigerant supplied to the continuous compressor 110b is directly supplied to the second accumulator 120b. .
The refrigerant thus supplied is compressed in each of the compressors 110a and 110b and circulated in the order as described above to obtain a cooling effect.
On the other hand, when a certain time elapses, when the indoor temperature reaches the set temperature or the user does not need to drive a plurality of compressors, such as raising the set temperature, the driving of the intermittent compressor 110a is stopped. .
Accordingly, the flow changing means 130 switches as shown in FIG. 3 by the discharge pressure or the electrical signal of the intermittent compressor 110a. In this case, the first port 131 and the fourth port 134 are connected, and the second port 132 and the third port 133 are connected.
Accordingly, the intermittent compressor 110a and the first accumulator 120a constitute one closed refrigerant circulation system, and the continuous compressor 110b constitutes one circulation system. At this time, the discharge pressure of the refrigerant generated in the intermittent compressor (110a) is a pressure balance within a short time by the refrigerant circulation of the first accumulator (120a).
On the other hand, a part of the refrigerant discharged from the continuous compressor (110b) is supplied to the flow change means 130, the rest is supplied to the condenser (170). At this time, the refrigerant supplied to the flow changing means 130 is returned to the common receiver 180, but in the present invention blocks the flow of the refrigerant through the check valve 140.
The refrigerant supplied to the condenser 170 passes through the above-described cooling line and returns to the common receiver 180. The refrigerant supplied in this way is partially provided to the fourth port 134 of the flow changing means 130, but the supply to the condenser 170 is blocked because it is lower than the refrigerant pressure supplied to the continuous compressor (110b). In addition, the remaining refrigerant is supplied to the continuous compressor 110a through the second accumulator 120b to continue the cooling operation while the refrigerant is circulated as described above.
Therefore, even if the intermittent compressor 110a is stopped, the operation of the continuous compressor 110b can prevent the refrigerant or oil from accumulating in the intermittent compressor 110a, and also the pressure balance between the inlet side and the outlet port of the intermittent compressor 110a. It will be easy to.

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The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and it is common in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be clear to those who have knowledge of

According to the air conditioner having a plurality of compressors according to the present invention as described above, when the intermittent compressor is stopped by the flow changing means, the intermittent compressor is constituted by one independent refrigerant circulation system, so that the pressure of the inlet and outlet of the intermittent compressor is reduced. As well as shortening the equilibrium time, it is possible to completely block the inflow of refrigerant and oil discharged by the continuous compressor in operation to prevent unnecessary oil accumulation phenomenon to the intermittent compressor in the stopped state.

Another effect of the present invention is that since the pressure balance of the compressor which is not operated by using the flow changing means is quick, the intermittent compressor can be driven immediately according to the cooling load state, thereby increasing the energy consumption efficiency. .

Another effect of the present invention is that it is possible to eliminate the need for the operation of the new control unit when the intermittent compressor is stopped and operated.

Claims (7)

In an air conditioner having a plurality of compressors including an intermittent compressor and a continuous compressor having different capacities, An intermittent compressor (110a) for supplying the refrigerant supplied from the first accumulator (120a) to the condenser (170) through the flow changing means (130); A continuous compressor (110b) for supplying the refrigerant supplied from the second accumulator (120b) to the condenser (170); The refrigerant circulated through the cooling line (condenser-expansion valve-evaporator) is collected and directly supplied to the second accumulator 120b, and the remaining refrigerant is supplied to the first accumulator 120a through the flow change means 130. Giving the common receiver 180; And It includes a flow changing means 130 for switching the flow of the refrigerant depending on whether the intermittent compressor (110a) is activated, When the intermittent compressor 110a stops, the flow changing means 130 switches the flow path so that the intermittent compressor 110a and the first accumulator 120a can be configured as one independent refrigerant circulation system. An air conditioner having a plurality of compressors, characterized in that. delete delete The method of claim 1, A check valve 140 is provided between the flow changing means 130 and the common receiver 180 so that the refrigerant discharged from the continuous compressor 110b directly to the common receiver 180 when the intermittent compressor 110a is stopped. An air conditioner having a plurality of compressors, characterized in that blocking the inflow. The method of claim 1, The flow change means 130 is an air conditioner having a plurality of compressors, characterized in that the four-way valve (Four Valve). The method according to claim 1 or 5, The flow change means (130) is an air conditioner having a plurality of compressors, characterized in that the operation is switched to receive the electrical signal for controlling the stop and start of the intermittent compressor (110a). The method according to claim 1 or 5, The flow change means (130) is an air conditioner having a plurality of compressors, characterized in that the operation is switched by the refrigerant pressure at the time of stopping and starting the intermittent compressor (110a).

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