JP2017502247A - Air conditioner system and control method of air conditioner system - Google Patents

Abstract

An air conditioner system including a two-cylinder variable capacity compressor (30) having an upper cylinder intake port, a lower cylinder intake port, and an exhaust port. The air conditioner system has one end connected to the exhaust port of the two-cylinder variable variable compressor (30) and the other end connected to the check valve (50) and the lower cylinder intake port of the two-cylinder variable variable compressor, respectively. The first solenoid valve (71) to be connected is further provided, and the check valve (50) has one end connected to the first solenoid valve (71) and the other end to the lumen of the gas-liquid separator. Connected to The air conditioner system further includes a second electromagnetic valve (72) provided in a pipe line connecting the lower cylinder intake port of the two-cylinder capacity variable compressor to the inlet of the gas-liquid separator. By adding a liquid discharge bypass line with an electric valve from the lower cylinder inlet to the gas-liquid separator inlet, the pressure of the high-pressure refrigerant on the lower cylinder intake side can be relieved to the gas-liquid separator. Optimize the stability of the system when switching from single cylinder operation to two cylinder operation. A method for controlling an air conditioner system is further disclosed. [Selection] Figure 2

Description

  The present invention relates to the field of air conditioners, and specifically to an air conditioner system and a method for controlling an air conditioner system.

  As a type of conventional air conditioner system, as shown in FIG. 1, a condenser 10, an evaporator 20, a variable capacity variable frequency compressor 30, a throttle component 40, a four-way valve 60, an electromagnetic valve 70, and a check valve 50 are provided. The capacity variable frequency variable compressor 30 performs switching based on the operation of the check valve 50 and the electromagnetic valve 70. When the solenoid valve 70 is opened, the high-pressure refrigerant on the exhaust side flows to the lower cylinder intake port of the compressor, and a high pressure is formed at the lower cylinder intake end, so that the single cylinder operation of the variable capacity variable frequency compressor 30 is achieved. When the electromagnetic valve 70 is closed, the low-pressure refrigerant in the gas-liquid separator flows to the lower cylinder intake port, a low pressure is formed in the lower cylinder intake port, and the variable capacity variable frequency compressor is switched to the two-cylinder operation.

The prior art described above has the following shortcomings.
(1) When switching from single-cylinder operation to two-cylinder operation or multi-cylinder operation, the solenoid valve is closed, but the connecting pipe from the lower cylinder intake port to the solenoid valve is still in a high pressure state and there is a pressure difference. Since the stop valve is closed, the low-pressure refrigerant of the gas-liquid separator does not easily flow to the lower cylinder, and the system is likely to be unstable when switching from single cylinder operation to two cylinder operation.
(2) At the time of single cylinder operation, the connecting pipe from the lower cylinder of the compressor to the solenoid valve is on the high pressure side, but the refrigerant is in a stationary state, so the temperature drops as the heat exchanges to the ambient temperature. In this case, if the operation is switched to the two-cylinder operation, the liquid-phase refrigerant flows into the lower cylinder, causing a liquid hammer to the lower cylinder and damaging the compressor.
(3) In order to solve the problem in the above (1), if a capillary tube is added to the connecting pipe between the lower cylinder intake port and the solenoid valve and connected to the inlet of the gas-liquid separator, the operation from the single cylinder operation can be improved. When switching to cylinder operation, the high-pressure refrigerant in the lower cylinder inlet is depressurized at the inlet of the gas-liquid separator via the capillary tube, and low-pressure refrigerant is formed in the lower cylinder inlet. Since the tubes circulate for a long time, the circulating refrigerant is reduced, resulting in heat loss.

  The present invention provides an air conditioner system and a control method for the air conditioner system for solving the problem that the air conditioner system in the prior art is likely to cause a switching failure during the switching from the single cylinder operation to the two cylinder operation of the compressor. Is the purpose.

  In order to achieve the above object, according to one aspect of the present invention, a two-cylinder variable displacement compressor having an upper cylinder intake port, a lower cylinder intake port, and an exhaust port is provided. A first solenoid valve connected to the exhaust port of the machine and having the other end connected to the check valve and the lower cylinder intake port of the two-cylinder capacity variable compressor, respectively, An air conditioner system having one end connected to the first solenoid valve and the other end connected to the lumen of the gas-liquid separator, the inlet of the gas-liquid separator from the lower cylinder inlet of the two-cylinder capacity variable compressor There is provided an air conditioner system further including a second electromagnetic valve provided in a pipe line connecting the above.

Furthermore, a capillary tube arranged in series with the second electromagnetic valve is further provided.
Further, a temperature sensor provided in the pipe line of the lower cylinder intake port is further provided.
Furthermore, a high-pressure sensor provided in the duct of the exhaust port is further provided.

  According to another aspect of the present invention, there is provided a control method for an air conditioner system applied to the air conditioner system, wherein the two-cylinder capacity variable compressor needs to be switched to a two-cylinder operation state while the single-cylinder variable compressor is in a single cylinder operation state. In this case, there is provided a control method for an air conditioner system including a step 10 for communicating a pipeline from a lower cylinder inlet of a two-cylinder variable capacity compressor to an inlet of a gas-liquid separator.

  Further, in step 10, the second electromagnetic valve opens a conduit that communicates from the lower cylinder inlet of the two-cylinder variable capacity compressor to the inlet of the gas-liquid separator, and after the passage of time ts, the first electromagnetic Close the valve.

Furthermore, 2 after the single-cylinder operating state of the cylinder variable displacement compressor has exceeded the time t1, each time the elapsed time t2, _{a temperature} T of the lower cylinder intake ports of the two-cylinder variable displacement compressor and 2-cylinder variable displacement compressor comparing the aircraft of outlet temperature T _high, if T _under ≦ T _high, further comprising 20 to open and close the second electromagnetic valve after continued t3 hours.

  Further, the time ts in step 10 is related to the outdoor environment temperature TW. When TW ≧ A ° C., ts = t 5, and when B ° C ≦ TW <A ° C., ts = t 6 and TW <B In the case of ° C., ts = t7 (t5, t6, and t7 are preset time constants, and A and B are preset temperature constants).

  Furthermore, step 10 further includes closing the second solenoid valve t4 hours after closing the first solenoid valve.

  By applying the technical solution of the present invention, a liquid discharge bypass pipe having an electric valve is connected so as to connect the lower cylinder intake port of the two-cylinder capacity variable compressor to the inlet of the gas-liquid separator. In this way, the high-pressure refrigerant on the lower cylinder intake side is decompressed by the gas-liquid separator, thereby optimizing the stability of the system when switching from single cylinder operation to two cylinder operation.

The drawings constituting part of the present application are for further understanding of the present invention, and the exemplary embodiments of the present invention and the description thereof illustrate the present invention, and the present invention is unduly limited. Not what you want. In the drawing
It is a figure which shows the air-conditioner system of a capacity | capacitance variable frequency variable compressor in a prior art. It is a figure which shows the air-conditioner system concerning this invention. It is a flowchart which shows the control method of the air-conditioning system concerning this invention.

  In addition, as long as it does not collide, the component in the Example of this application and an Example can be combined. Hereinafter, the present invention will be described in detail with reference to the drawings and embodiments.

Referring to FIG. 2, in accordance with the prior art, the present invention connects a lower cylinder intake port of a two-cylinder variable capacity compressor to an inlet of a gas-liquid separator, and connects a capillary tube and a second electromagnetic valve 72. while adding the liquid discharge bypass pipe road comprising mainly by adding a high-pressure sensor 100 measures the condensation temperature T _higher on the exhaust side of the second cylinder variable displacement compressor, and additional temperature sensor 90 as a measuring tool to the lower cylinder intake port detecting the temperature T of _a lower cylinder inlet Te. In certain cases, the second solenoid valve 72 in the liquid discharge bypass line is opened and operated to relieve pressure and discharge liquid. When the lower cylinder intake port is in a liquid pool state, the liquid phase refrigerant in the connecting pipe from the lower cylinder of the two-cylinder variable capacity compressor 30 to the first electromagnetic valve 71 is discharged to the gas-liquid separator by automatic measurement. Can do. When switching from single-cylinder operation to two-cylinder operation, the pressure of the high-pressure refrigerant on the lower cylinder intake side is relieved to the gas-liquid separator via the liquid discharge bypass to achieve switching from single-cylinder operation to two-cylinder operation. Increase system stability when switching operations.

  As shown in FIG. 2, the air conditioner system according to the present invention includes a two-cylinder variable capacity compressor 30 and a gas-liquid separator, and the two-cylinder variable capacity compressor 30 includes an upper cylinder inlet, a lower cylinder, and the like. Three branches are drawn out: the inlet and the outlet. The two-cylinder variable capacity compressor 30, the first heat exchanger 10, the throttle assembly 40, and the second heat exchanger 20 are connected in a loop. The air conditioner system further includes a four-way valve 60, a first electromagnetic valve 71, and a check valve 50. The first heat exchanger 10 and the second heat exchanger 20 are selectively communicated with the two-cylinder variable capacity compressor 30 via the four-way valve 60, and one end of the first electromagnetic valve 71 has a two-cylinder capacity. The other end is connected to the exhaust port of the variable compressor 30 and the other end is connected to the check valve 50 and the lower cylinder intake port. One end of the check valve 50 is connected to the lower cylinder from the first electromagnetic valve 71. The other end is connected to the lumen of the gas-liquid separator, and the flow from the gas-liquid separator to the lower cylinder inlet is set as a flowable direction in the check valve 50. To do. According to the present invention, the branch consisting of the second solenoid valve 72 and a capillary tube connected in series with the second solenoid valve 72 is formed between the conduit of the lower cylinder inlet in the compressor and the conduit of the inlet of the gas-liquid separator in the gas-liquid separator. It will be expanded to be connected between them.

  The capillary tube in the liquid discharge bypass conduit has a function of controlling the flow rate of liquid discharge. In the case of a capillary tube that is too thick and too short, the flow rate becomes excessive, causing a pressure drop in the lower cylinder, and due to insufficient pressure, the single cylinder operation cannot be continued and the operation is switched to the two cylinder operation. In the case of a capillary tube that is too thin and too long, the flow rate becomes too low, resulting in an excessively low liquid discharge speed, and the liquid discharge operation cannot be completed within a predetermined time. Therefore, an appropriate capillary tube is required for the liquid discharge bypass conduit.

  With reference to FIG. 3, the control method of the air-conditioning system according to the present invention includes the following steps (1) to (3).

(1) When the two-cylinder variable capacity compressor 30 is in a single cylinder operation, every time t2 time elapses after the single cylinder operation time of the two-cylinder capacity variable compressor 30 exceeds t1 time, T _lower and T _high If T _lower ≤ T _high , it is determined that liquid is accumulated in the lower intake pipe in the air conditioner system, and the second solenoid valve 72 is opened and then closed after t3 hours, Achieves liquid draining action at intervals.
(2) When the two-cylinder capacity variable compressor 30 needs to be switched to the two-cylinder operation even in the single-cylinder operation, the first electromagnetic valve 71 is closed after ts time after the second electromagnetic valve 72 is opened. The action of pressure relief is achieved by closing the second electromagnetic valve 72 after t4 hours from closing the first electromagnetic valve 71.
(3) Since the liquid pool state varies depending on the outdoor environment temperature TW, the time ts in step (2) is related to the outdoor environment temperature. For example, the time ts is as follows. Set temperature constant, which can be determined by experiment).
a) When TW ≧ A ° C., ts = t5.
b) When B ° C. ≦ TW <A ° C., ts = t6.
c) When TW <B ° C., ts = t7. (The above-described t1, t2, t3, t4, t5, t6, and t7 are preset times and can be determined by experiment.)

  The present invention increases the cooling / heating amount adjustment range of the system by combining variable capacity technology with a frequency variable compressor having two or more cylinders with a gas-liquid separator. The bypass branch consisting of the second solenoid valve and the capillary tube mainly opens the second solenoid valve between the lower cylinder intake port and the first solenoid valve when the first solenoid valve needs to be closed. The pressure in the conduit is reduced to match the low pressure, thereby ensuring that the compressor is switched to two cylinders immediately after closing the first solenoid valve. When the air-conditioner system is in single-cylinder operation, it is determined whether or not liquid is accumulated in the lower intake port based on the temperature measured by the pipe temperature sensor at the lower intake port of the compressor and the high pressure temperature measured by the high pressure sensor. If it is determined that the liquid has accumulated, the second solenoid valve is opened for a while, so that after a long period of operation by a single cylinder of the compressor, a liquid hammer is generated when switching to two cylinders. Can act to prevent.

  The above are only preferred embodiments of the present invention and are not intended to limit the present invention. A person skilled in the art can make various changes and modifications to the present invention. Any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

A two-cylinder variable displacement compressor (30) having an upper cylinder intake port, a lower cylinder intake port, and an exhaust port is provided, with one end connected to the exhaust port of the two-cylinder variable variable compressor (30) and the other end. Further comprising a first solenoid valve (71) connected to the check valve (50) and the lower cylinder intake port of the two-cylinder variable displacement compressor (30), respectively, and the check valve (50) An air conditioner system having one end connected to the first solenoid valve (71) and the other end connected to the lumen of the gas-liquid separator,
An air conditioner system further comprising: a second electromagnetic valve (72) provided in a pipe connecting the lower cylinder intake port of the two-cylinder variable capacity compressor (30) to the inlet of the gas-liquid separator. .   The air conditioner system according to claim 1, further comprising a capillary tube arranged in series with the second electromagnetic valve (72).   The air conditioner system according to claim 1, further comprising a temperature sensor (90) provided in a pipe line of the lower cylinder intake port.   The air conditioner system according to claim 1, further comprising a high-pressure sensor (100) provided in a pipe line of the exhaust port. A control method of an air conditioner system applied to the air conditioner system according to any one of claims 1 to 4,
When it is necessary to switch to the two-cylinder operation state while the two-cylinder capacity variable compressor (30) is in the single-cylinder operation state, the gas-liquid separator is supplied from the lower cylinder intake port of the two-cylinder capacity variable compressor (30). A control method for an air conditioner system, comprising a step 10 of communicating a pipe line to the entrance of the air conditioner.   In step 10, the second electromagnetic valve (72) opens a conduit communicating from the lower cylinder inlet of the two-cylinder variable capacity compressor (30) to the inlet of the gas-liquid separator, and time ts has elapsed. Then, the first electromagnetic valve (71) is closed. After the single-cylinder operation state of the two-cylinder capacity variable compressor (30) exceeds the time t1, every time t2 elapses, the temperature of the lower cylinder inlet of the two-cylinder capacity variable compressor (30) decreases _below the temperature T. And the temperature T _high of the exhaust port of the two-cylinder capacity variable compressor (30), and if T _lower ≦ T _high , the second solenoid valve (71) is opened and then closed after continuing for t3 hours The method of controlling an air conditioner system according to claim 6, further comprising step 20.   The time ts in step 10 is related to the outdoor environment temperature TW. When TW ≧ A ° C., ts = t 5, and when B ° C. ≦ TW <A ° C., ts = t 6 and TW <B ° C. Ts = t7 (where t5, t6, and t7 are preset time constants, and A and B are preset temperature constants). How to control the system.   The air conditioner according to claim 6, wherein the step 10 further includes closing the second electromagnetic valve (72) t4 hours after closing the first electromagnetic valve (71). How to control the system.