Dual-path air conditioning system

Abstract

The application relates to a two-way air conditioning system, which comprises a compressor, a gas supplement pipeline and a non-gas supplement pipeline. The non-gas supplement pipeline comprises a first compressor, a condenser, a throttle valve A and an evaporator connected in series through pipelines. The gas supplement pipeline comprises a gas storage tank and a second compressor, a condenser, a throttle valve A, a flash tank and an evaporator connected in series through pipelines. The output end of the gas storage tank is connected with the input end of the second compressor through a pipeline provided with a one-way valve G and a throttle valve H. According to different application occasions of the air conditioner, the system is switched and operated according to gas supplement / non-gas supplement. When normal refrigeration and heating operation is carried out, only the first compressor is used to work. When low-temperature heating and other working conditions are carried out, only the second compressor is used to work, and the refrigerant filling amount is increased through the gas storage tank, so that the air conditioning performance reaches an optimal level.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically to a dual-circuit air conditioning system. Background Technology

[0002] For low-temperature heating applications, using gas injection enthalpy enhancement technology can effectively improve the heating capacity and energy efficiency of air conditioners. However, for conventional cooling and heating, this technology may result in reduced energy efficiency. Furthermore, gas injection enthalpy enhancement requires a larger refrigerant charge; therefore, reducing the refrigerant charge for conventional cooling and heating is more beneficial for energy efficiency. Thus, to optimize air conditioner performance for different applications, different refrigerant charge amounts and the ability to activate and deactivate gas injection enthalpy enhancement are necessary. However, existing air conditioners lack this functionality. Summary of the Invention

[0003] The purpose of this invention is to address the above-mentioned shortcomings by providing a dual-circuit air conditioning system.

[0004] One technical solution adopted by the present invention to solve the technical problem is to provide a dual-circuit air conditioning system, including a compressor, a gas supply line, and a non-gas supply line;

[0005] The non-recharge pipeline includes a first compressor, a condenser, a throttle valve A, and an evaporator connected in series via the pipeline;

[0006] The gas supply pipeline includes a gas storage tank and a second compressor, condenser, throttle valve A, flash tank, and evaporator connected in series via the pipeline. The output end of the gas storage tank is connected to the input end of the second compressor via a pipeline equipped with a one-way valve G and a throttle valve H.

[0007] Furthermore, the compressor is a dual-cylinder compressor, and the two working cylinders of the dual-cylinder compressor work independently. The first compressor is the ordinary working cylinder of the dual-cylinder compressor, and the second compressor is the gas replenishment working cylinder of the dual-cylinder compressor.

[0008] Furthermore, the output end of the throttle valve A is connected to the input end of the evaporator via a pipe equipped with a one-way valve B, and the output end of the evaporator is connected to the input end of the first compressor via a pipe equipped with a one-way valve I.

[0009] The output end of the throttle valve A is connected to the input end of the flash tank via a pipeline equipped with a one-way valve C. The output end of the flash tank is connected to the input end of the evaporator via a pipeline equipped with a throttle valve D and a one-way valve E. The output end of the evaporator is connected to the input end of the second compressor via a pipeline equipped with a one-way valve J.

[0010] Furthermore, the gas storage tank input end is connected to the flash tank and the second compressor output end via a pipeline equipped with a one-way valve F.

[0011] Furthermore, each check valve and each throttle valve is an electromagnetic valve electrically connected to the air conditioner controller.

[0012] Furthermore, when the system is not powered on, the gas tank is under medium pressure, while the compressor, condenser, flash tank, and evaporator are all under low pressure. All one-way valves are closed, and the gas tank is not connected to the outside.

[0013] Furthermore, during normal cooling and heating operation, only the first compressor operates, check valves B and I are open, and the other check valves are closed.

[0014] When the system is shut down, the first compressor stops. After the system pressure is balanced, the controller closes check valves B and I, restoring the system to the shutdown state.

[0015] Furthermore, when the system is operating in low-temperature heating mode, only the second compressor works, and check valves C, E, G, and J are open.

[0016] When the system is shut down, check valve G is closed and check valve F is opened. A pressure sensor electrically connected to the controller is installed on the gas tank. When the pressure in the gas tank changes by less than 0.05 MPa within 3 minutes, the gas tank returns to medium pressure, the controller closes check valve F, and the second compressor stops.

[0017] Furthermore, after the second compressor stops and the system pressure is balanced, the controller closes check valves C, E, and J, restoring the system to the shutdown state.

[0018] An air conditioner includes an air conditioning system, wherein the air conditioning system employs the aforementioned dual-circuit air conditioning system.

[0019] Compared with the prior art, the present invention has the following beneficial effects: depending on the different application scenarios of the air conditioner, it switches between gas-supplemented and non-gas-supplemented operation. When performing conventional cooling and heating operation, only the first compressor works, and when performing low-temperature heating and other conditions, only the second compressor works. The amount of refrigerant charged is increased through the gas tank to achieve a better level of air conditioner performance. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the structure of this dual-circuit air conditioning system.

[0022] In the diagram: 1-Twin-cylinder compressor; 101-First compressor; 102-Second compressor; 2-Condenser; 3-Throttle valve A; 4-Check valve B; 5-Evaporator; 6-Check valve C; 7-Flash tank; 8-Throttle valve D; 9-Check valve E; 10-Check valve F; 11-Gas receiver; 12-Check valve G; 13-Throttle valve H; 14-Check valve I; 15-Check valve J. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0024] Example 1:

[0025] A dual-circuit air conditioning system includes a compressor, a gas supply line, and a non-gas supply line;

[0026] The non-replenishment gas pipeline includes a first compressor 101, a condenser 2, a throttle valve A3, and an evaporator 5 connected in series via the pipeline;

[0027] The gas supply pipeline includes a gas storage tank 11 and a second compressor 102, a condenser, a throttle valve A, a flash tank, and an evaporator connected in series via the pipeline. The output end of the gas storage tank is connected to the input end of the second compressor via a pipeline equipped with a one-way valve G12 and a throttle valve 13H.

[0028] The refrigerant flows in both the gas supply line and the non-gas supply line.

[0029] When in use, the system switches between refrigerant supply and non-refrigerant supply depending on the application of the air conditioner. When performing regular cooling or heating, only the first compressor operates. When performing low-temperature heating, only the second compressor operates, and the refrigerant charge is increased through the gas tank to achieve a better air conditioner performance.

[0030] Example 2:

[0031] Example 2 is a specific system pipeline implementation structure proposed based on Example 1. The gas supply pipeline and the non-gas supply pipeline are switched by controlling the opening or closing of different one-way valves.

[0032] In this embodiment, the compressor is a dual-cylinder compressor 1, and the two working cylinders of the dual-cylinder compressor work independently. The first compressor is the ordinary working cylinder of the dual-cylinder compressor, and the second compressor is the gas replenishment working cylinder of the dual-cylinder compressor.

[0033] In this embodiment, the output end of the throttle valve A is connected to the input end of the evaporator via a pipe equipped with a one-way valve B4, and the output end of the evaporator is connected to the input end of the first compressor via a pipe equipped with a one-way valve I14.

[0034] The output end of the throttle valve A is connected to the input end of the flash tank via a pipeline equipped with a one-way valve C6. The output end of the flash tank is connected to the input end of the evaporator via a pipeline equipped with a throttle valve D8 and a one-way valve E9. The output end of the evaporator is connected to the input end of the second compressor via a pipeline equipped with a one-way valve J15.

[0035] In this embodiment, the input end of the gas storage tank is connected to the flash tank and the output end of the second compressor via a pipeline equipped with a one-way valve F10. The function of the one-way valve F is that gas can only flow into the gas storage tank through the one-way valve F, and the gas in the gas storage tank cannot flow to the flash tank and the second compressor through the one-way valve F.

[0036] In this embodiment, each check valve and each throttle valve is a solenoid valve electrically connected to the air conditioner controller.

[0037] System shutdown status:

[0038] The gas tank is under medium pressure, while the compressor, condenser, flash tank, and evaporator are all under low pressure. All one-way valves are closed, and the gas tank is not connected to the outside.

[0039] The system is in normal cooling and heating operation mode:

[0040] At this time, the system enters the normal non-gas-replenishment operation mode, with only the first compressor working, check valves B and I open, and the remaining check valves closed; the system operates in the flow direction of "first compressor, condenser, throttle valve A, check valve B, evaporator, check valve I, first compressor".

[0041] When the system is shut down, the first compressor stops. After the system pressure is balanced, the controller closes check valves B and I, restoring the system to the shutdown state.

[0042] In practical applications, there are two ways to determine system pressure balance:

[0043] One approach is that after the first compressor stops for 3 minutes, the pressure can be considered to have reached equilibrium, and the next working state can begin. Therefore, the process is that after the first compressor stops for 3 minutes, the controller controls the corresponding check valve to close.

[0044] Another approach is to install pressure sensors on the input and output sides of throttle valve A. When the difference between the two pressures is within 0.02 MPa, it is determined that the pressure has reached a balance state, and the controller controls the corresponding check valve to close.

[0045] The system is in low-temperature heating operation mode:

[0046] At this time, the system enters the gas replenishment mode, only the second compressor works, check valves C, E, G, and J are open, and the rest of the check valves are closed.

[0047] The system operates in the following order: "Second compressor, condenser, throttle valve A, check valve C, flash tank, throttle valve D, check valve E, evaporator, check valve J, second compressor".

[0048] While the gas replenishment mode is running, because the gas tank is under medium pressure, the gas in the gas tank enters the low-pressure flow path through the one-way valve G and the throttle valve H, thereby increasing the amount of refrigerant injected during the gas replenishment operation, which is beneficial to improving the air conditioning performance in the gas replenishment mode.

[0049] When the system is shut down, check valve G is closed and check valve F is opened. The medium-pressure gas refrigerant in the make-up gas path enters the gas tank through check valve F. The gas tank is equipped with a pressure sensor that is electrically connected to the controller. When the pressure in the gas tank changes by less than 0.05 MPa within 3 minutes, the gas tank returns to medium pressure, the controller controls check valve F to close, and the second compressor stops.

[0050] In this embodiment, after the second compressor stops and the system pressure is balanced, the controller controls the one-way valves C, E, and J to close, restoring the system to the shutdown state, and then restarting when the system is turned on again.

[0051] In practical applications, there are two ways to determine system pressure balance:

[0052] One approach is that the pressure can be considered to have reached equilibrium 3 minutes after the second compressor stops, and the next working state can begin. Therefore, the procedure is that after the second compressor stops 3 minutes, the controller controls the corresponding check valve to close.

[0053] Another approach is to install pressure sensors on the input and output sides of throttle valve A. When the difference between the two pressures is within 0.02 MPa, it is determined that the pressure has reached a balance state, and the controller controls the corresponding check valve to close.

[0054] Example 2 uses a dual-cylinder compressor. One cylinder is a regular compression cylinder that operates on the non-refill gas pipeline, while the other cylinder is a refill gas compression cylinder that operates on the refill gas pipeline. The two cylinders work independently and can switch between refill gas and non-refill gas operation according to different application scenarios. Furthermore, the refrigerant charge is increased during refill gas operation to achieve a better level of air conditioning performance.

[0055] Example 3:

[0056] Example 3 provides an air conditioner, which includes an air conditioning system, wherein the air conditioning system is the dual-circuit air conditioning system of Example 1 or Example 1.

[0057] If this patent discloses or relates to components or structural parts that are fixedly connected to each other, then unless otherwise stated, a fixed connection can be understood as: a fixed connection that can be detached (e.g., using bolts or screws), or a fixed connection that cannot be detached (e.g., riveting, welding). Of course, a fixed connection can also be replaced by an integral structure (e.g., manufactured by casting) (except where it is obviously impossible to use an integral forming process).

[0058] In the description of this patent, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this patent and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this patent.

[0059] The above-described preferred embodiments further illustrate the purpose, technical solutions, and advantages of the present invention. It should be understood that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dual-circuit air conditioning system, characterized in that: This includes the compressor, the gas supply line, and the non-gas supply line; The compressor is a twin-cylinder compressor, and the two working cylinders of the twin-cylinder compressor work independently. The first compressor is the ordinary working cylinder of the twin-cylinder compressor, and the second compressor is the gas injection working cylinder of the twin-cylinder compressor. The non-recharge pipeline includes a first compressor, a condenser, a throttle valve A, and an evaporator connected in series via the pipeline; The gas supply pipeline includes a gas storage tank and a second compressor, condenser, throttle valve A, flash tank, and evaporator connected in series via the pipeline. The output end of the gas storage tank is connected to the input end of the second compressor via a pipeline equipped with a one-way valve G and a throttle valve H. The gas storage tank input end is connected to the flash tank and the second compressor output end via a pipeline equipped with a one-way valve F.

2. The dual-circuit air conditioning system according to claim 1, characterized in that: The output end of the throttle valve A is connected to the input end of the evaporator via a pipe equipped with a one-way valve B, and the output end of the evaporator is connected to the input end of the first compressor via a pipe equipped with a one-way valve I. The output end of the throttle valve A is connected to the input end of the flash tank via a pipeline equipped with a one-way valve C. The output end of the flash tank is connected to the input end of the evaporator via a pipeline equipped with a throttle valve D and a one-way valve E. The output end of the evaporator is connected to the input end of the second compressor via a pipeline equipped with a one-way valve J.

3. The dual-circuit air conditioning system according to claim 1, characterized in that: Each check valve and each throttle valve is an electromagnetic valve electrically connected to the air conditioner controller.

4. The dual-circuit air conditioning system according to claim 1, characterized in that: When the system is not powered on, the gas tank is under medium pressure, while the compressor, condenser, flash tank, and evaporator are all under low pressure. All one-way valves are closed, and the gas tank is not connected to the outside.

5. The dual-circuit air conditioning system according to claim 4, characterized in that: When the system is in normal cooling and heating mode, only the first compressor works, check valves B and I are open, and the other check valves are closed. When the system is shut down, the first compressor stops. After the system pressure is balanced, the controller closes check valves B and I, restoring the system to the shutdown state.

6. The dual-circuit air conditioning system according to claim 5, characterized in that: When the system is running in low-temperature heating mode, only the second compressor is working, and check valves C, E, G, and J are open. When the system is shut down, check valve G is closed and check valve F is opened. A pressure sensor electrically connected to the controller is installed on the gas tank. When the pressure in the gas tank changes by less than 0.05 MPa within 3 minutes, the gas tank returns to medium pressure, the controller closes check valve F, and the second compressor stops.

7. The dual-circuit air conditioning system according to claim 6, characterized in that: After the second compressor stops and the system pressure is balanced, the controller closes check valves C, E, and J, restoring the system to the shutdown state.

8. An air conditioner, comprising an air conditioning system, characterized in that: The air conditioning system is the dual-circuit air conditioning system as described in any one of claims 1-7.

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