Air conditioning system, air conditioning unit and control method

Abstract

The application discloses an air conditioning system, an air conditioning unit and a control method, which comprises a compressor, a four-way valve, an outdoor heat exchanger, a throttling assembly and an indoor heat exchange module connected in sequence to form a refrigerant circulation loop; the refrigerant circulation loop is provided with a gas-liquid separator for temporarily storing liquid refrigerant, the gas-liquid separator is connected between the indoor heat exchange module and the four-way valve and is switched to be connected to the suction side or the exhaust side of the compressor through the four-way valve; the inner cavity bottom of the gas-liquid separator is communicated with the inlet side of the indoor heat exchange module under a heating cycle through a liquid discharge pipeline. The application communicates the liquid discharge pipeline between the inner cavity bottom of the gas-liquid separator and the inlet side of the indoor heat exchange module under the heating cycle, so that the liquid refrigerant in the inner cavity bottom of the gas-liquid separator is discharged from the liquid discharge pipeline, and the liquid discharge pipeline of the gas-liquid separator has enough power to discharge liquid under the high gas pressure of the gas refrigerant.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning, in particular to an air conditioning system, an air conditioning unit and a control method. BACKGROUND

[0002] Currently, when the air conditioning system is in heating operation, the outdoor side is the evaporation side. With the evaporation heat absorption of the refrigerant, the temperature of the outdoor side pipeline decreases, and the surface of the outdoor heat exchanger gradually frosts. When the air conditioning system is in defrosting operation, the four-way valve is generally used to switch the refrigerant flow direction to the refrigeration cycle, and the high-temperature gaseous refrigerant enters the outdoor heat exchanger, and the frost layer on the surface of the outdoor heat exchanger absorbs heat to achieve defrosting. After defrosting, the four-way valve switches the refrigerant flow direction to the heating cycle, and the air conditioning system resumes the heating mode operation. The air conditioning system has the problem of large difference in the required refrigerant circulation amount between the refrigeration mode and the heating mode. When the required refrigerant circulation amount in the heating mode is met, the refrigerant circulation amount in the refrigeration mode is too much, which leads to large high-low pressure difference of the system, large compressor load and poor energy saving effect. Therefore, some air conditioning systems set a gas-liquid separator to realize gas-liquid adjustment in different modes, that is, to temporarily store the excess liquid refrigerant in the gas-liquid separator. However, due to the large amount of liquid refrigerant in the gas-liquid separator after defrosting, the liquid refrigerant cannot be transferred in time, which leads to slow heating effect and poor heat exchange efficiency after defrosting. SUMMARY

[0003] In order to solve the problem of refrigerant accumulation in the outdoor heat exchanger during the defrosting process of the existing air conditioning system, which leads to slow heating effect after defrosting, the present application provides an air conditioning system, an air conditioning unit and a control method for realizing liquid refrigerant transfer. The air conditioning system can rely on the high-temperature and high-pressure refrigerant of the exhaust gas to gasify the liquid refrigerant in the gas-liquid separator and bring it into the heating cycle when switching to the heating cycle after defrosting, so as to finally achieve the effect of fast heating after defrosting.

[0004] The technical solution adopted by the present application is to design an air conditioning system, which comprises: a compressor, a four-way valve, an outdoor heat exchanger, a throttling assembly and an indoor heat exchange module connected in sequence to form a refrigerant circulation loop; the refrigerant circulation loop is provided with a gas-liquid separator for temporarily storing liquid refrigerant, the gas-liquid separator is connected between the indoor heat exchange module and the four-way valve, and is connected to the suction side or the exhaust side of the compressor through the four-way valve switching; the inner cavity bottom of the gas-liquid separator is communicated with the inlet side of the indoor heat exchange module in the heating cycle through a liquid discharge pipeline.

[0005] In some embodiments, the first end of the gas-liquid separator is connected to the four-way valve, and the second end of the gas-liquid separator is connected to the outlet side of the indoor heat exchange module in the refrigeration cycle.

[0006] In some embodiments, the liquid discharge pipeline is connected to the first pipeline between the second end of the gas-liquid separator and the indoor heat exchange module.

[0007] In some embodiments, the communication position of the liquid discharge pipeline with the first pipeline is not higher than the pipe opening height of the liquid discharge pipeline in the gas-liquid separator.

[0008] In some embodiments, the first end of the gas-liquid separator is located at the top of the gas-liquid separator cavity, the pipeline of the first end in the gas-liquid separator cavity is a U-shaped pipe, and the pipe opening of the U-shaped pipe is upwardly close to the top of the gas-liquid separator cavity.

[0009] In some embodiments, the second end of the gas-liquid separator is located at the top of the gas-liquid separator cavity, and the pipe opening of the second end in the gas-liquid separator cavity is oppositely arranged with the pipe opening of the first end and is obliquely arranged toward one side.

[0010] In some embodiments, the bottom of the U-shaped pipe is provided with an oil return hole.

[0011] In some embodiments, the control valve is arranged on the liquid discharge pipeline.

[0012] The air conditioning unit comprises the air conditioning system.

[0013] The control method is applied to the air conditioning system, and the control method comprises the following steps: after the refrigerant circulation loop operates the defrosting cycle, it is judged whether there is a heating demand, if yes, the control valve is opened and the air conditioning system is switched to the heating cycle, so that the liquid refrigerant in the gas-liquid separator is discharged from the liquid discharge pipeline.

[0014] Compared with the prior art, the present application has the following beneficial effects:

[0015] By arranging the liquid discharge pipeline between the bottom of the gas-liquid separator cavity and the inlet side of the indoor heat exchange module in the heating cycle, the liquid refrigerant at the bottom of the gas-liquid separator cavity is discharged from the liquid discharge pipeline, and under the high pressure of the gas refrigerant, the liquid discharge pipeline of the gas-liquid separator has enough power to discharge the liquid.

[0016] The liquid refrigerant enters the gas refrigerant pipeline, accelerates the vaporization of the liquid refrigerant, thereby accelerating the vaporization speed of the overall liquid refrigerant of the air conditioning system, shortening the time of discharging the liquid refrigerant of the gas-liquid separator, reducing the time of recovering the heating capacity to the maximum output after defrosting, and improving the heating capacity. BRIEF DESCRIPTION OF DRAWINGS

[0017] The present application will be described in detail below with reference to specific embodiments and drawings, in order to show details for the purpose of understanding its principles, which are not necessarily drawn to scale, and similar reference numerals can be used to describe similar components in different views. The drawings generally show the embodiments discussed herein in an exemplary and non-limiting manner. Among them:

[0018] Figure 1 This is a schematic diagram of the air conditioning system in Example 1.

[0019] Figure 2 This is a schematic diagram of the air conditioning system in Implementation Example 1 operating in cooling or defrosting mode.

[0020] Figure 3 This is a schematic diagram of the air conditioning system in heating mode as described in Example 1.

[0021] Figure 4 This is a schematic diagram of the gas-liquid separator part of Example 1.

[0022] Figure 5 This is a schematic diagram of the air conditioning system in Example 2.

[0023] Figure 6 This is a schematic diagram of the air conditioning system in embodiment two operating in cooling or defrosting mode.

[0024] Figure 7 This is a schematic diagram of the air conditioning system in heating mode as described in Example 2.

[0025] In the diagram, 1. Compressor; 2. Four-way valve; 3. Outdoor heat exchanger; 4. Outdoor fan; 5. Throttling assembly; 6. Liquid pipe; 7. Gas pipe; 8. Gas-liquid separator; 9. Oil return hole; 10. Control valve; 101. First end; 102. Second end; 103. Drain pipe; 104. Connecting position. Detailed Implementation

[0026] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments, and the following embodiments do not limit the invention covered by the claims. Furthermore, not all combinations of the features described in the embodiments are necessary for the inventive solution.

[0027] The principles and structure of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0028] Example 1

[0029] like Figure 1 As shown, the air conditioning system proposed in this invention can solve the problem of liquid refrigerant accumulating in the gas-liquid separator after defrosting. When switching to heating mode after defrosting, the high-temperature and high-pressure refrigerant discharged by the compressor vaporizes the accumulated liquid refrigerant and brings it into the heating cycle, ultimately achieving the effect of rapid heating after defrosting.

[0030] Specifically, the air conditioning system includes: a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an outdoor fan 4, a throttling assembly 5, and an indoor heat exchange module located between a liquid pipe 6 and a gas pipe 7, connected in sequence to form a refrigerant circulation loop; the refrigerant circulation loop is equipped with a gas-liquid separator 8 for temporarily storing liquid refrigerant, the gas-liquid separator 8 is connected between the indoor heat exchange module and the four-way valve 2, and is switched to the suction side or the exhaust side of the compressor 1 via the four-way valve 2. Figure 4 As shown, the bottom of the inner cavity of the gas-liquid separator 8 is connected to the inlet side of the indoor heat exchange module under heating cycle via a drain pipe. The first end 101 of the gas-liquid separator 8 is connected to the four-way valve 2, and the second end 102 of the gas-liquid separator 8 is connected to the outlet side of the indoor heat exchange module under cooling cycle. The drain pipe is connected to the first pipe between the second end 102 of the gas-liquid separator 8 and the indoor heat exchange module; the first pipe is the gas pipe 7.

[0031] When the refrigerant circulation loop is operating in the refrigeration or defrosting cycle, the gas-liquid separator 8 is connected to the suction side of the compressor 1. The refrigerant is returned to the suction side of the compressor 1 through the gas-liquid separator 8, and the liquid refrigerant is stored in the gas-liquid separator 8 to prevent the liquid refrigerant from accumulating in the outdoor heat exchanger 3; specifically as follows... Figure 2 As shown, when the air conditioner is in cooling or defrosting mode, the refrigerant is discharged from the compressor, enters the outdoor heat exchanger 3 for condensation and heat exchange through the four-way valve 2, enters the indoor side for heat exchange through the heating electronic expansion valve and liquid pipe 6, and then enters the vapor-liquid separator through the gas pipe 7 from the first end 101 of the vapor-liquid separator and the vapor-liquid separator drain pipe. It flows out from the first end 101 of the vapor-liquid separator and returns to the suction side of the compressor 1 through the four-way valve 2.

[0032] After defrosting ends and the system switches to heating mode, high-temperature, high-pressure gaseous refrigerant enters the first end 101 of the gas-liquid separator 8. This gaseous refrigerant not only enters the first pipeline from the second end 102 of the gas-liquid separator 8, but also causes the liquid refrigerant at the bottom of the gas-liquid separator 8 to be discharged from the drain pipe into the first pipeline. Under the high pressure of the gaseous refrigerant, the drain pipe of the gas-liquid separator has sufficient power to drain the liquid. The gaseous refrigerant in the first pipeline accelerates the vaporization of the incoming liquid refrigerant, thereby speeding up the overall vaporization rate of the liquid refrigerant in the air conditioning system, shortening the time for liquid refrigerant to be discharged from the gas-liquid separator, reducing the time it takes for the heating capacity to recover to maximum output after defrosting, and improving the heating capacity.

[0033] When the refrigerant circulation loop switches to the heating cycle, the gas-liquid separator 8 is connected to the discharge side of the compressor 1. The high-temperature refrigerant discharged from the compressor 1 passes through the gas-liquid separator 8, where it heats and vaporizes the liquid refrigerant, which is then carried into the refrigeration cycle to achieve rapid heating after defrosting. Specifically, as follows... Figure 3As shown, after defrosting, when the air conditioner switches to heating mode, the refrigerant is discharged from the compressor, enters the vapor-liquid separator from the first end of the vapor-liquid separator through the four-way valve 2, flows out from the second end 102 of the vapor-liquid separator and the liquid discharge pipe of the vapor-liquid separator, enters the indoor side for heat exchange through the gas pipe 7, returns to the outdoor heat exchanger 3 for evaporation and heat exchange through the liquid pipe 6 and the heating electronic expansion valve, and returns to the suction side of the compressor 1 through the four-way valve 2.

[0034] The connection point 104 between the drain pipe and the first pipe is not higher than the height of the drain pipe opening inside the gas-liquid separator 8, so as to simultaneously utilize the gravitational potential energy of the liquid refrigerant to accelerate the draining process.

[0035] The first end 101 of the gas-liquid separator is located at the top of the inner cavity of the gas-liquid separator 8. The pipe at the first end 101 in the inner cavity of the gas-liquid separator 8 is a U-shaped pipe. The opening of the U-shaped pipe faces upward and is close to the top of the inner cavity of the gas-liquid separator 8 so that gas can enter and exit from the top of the inner cavity of the gas-liquid separator.

[0036] The second end 102 of the gas-liquid separator is located at the top of the inner cavity of the gas-liquid separator 8. The pipe opening of the second end 102 in the inner cavity of the gas-liquid separator 8 is vertically opposite to the pipe opening of the first end 101 and is inclined to one side to avoid the two ends being directly opposite each other, so as to achieve better gas-liquid separation.

[0037] The bottom of the U-shaped tube is provided with an oil return hole 9, which allows the lubricating oil mixed in the refrigerant to return to the compressor 1, ensuring the oil quantity in the compressor 1 and the oil supply to the scroll section.

[0038] This air conditioning system is suitable for various air conditioning units, thereby accelerating the vaporization speed of the overall liquid refrigerant in the air conditioning system, shortening the time for liquid refrigerant to be discharged from the vapor-liquid separator, and reducing the time for the heating capacity to recover to maximum output after defrosting.

[0039] Example 2

[0040] like Figure 5 , 6 As shown in Figures 7 and 8, a control valve 10 can be installed on the drain pipe to control the on / off state or flow rate of the drain pipe.

[0041] The control method includes: after the defrosting cycle is running in the refrigerant circulation loop, determining whether there is a heating demand; if so, opening the control valve 10 and switching the air conditioning system to heating cycle, so that the liquid refrigerant in the gas-liquid separator 8 is discharged from the drain pipe.

[0042] During the refrigeration cycle, the control valve 10 can be selectively opened or closed.

[0043] Although this document uses a number of technical terms, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention. The order of actions, steps, etc., in the apparatus and methods shown in the specification and drawings can be implemented in any order unless otherwise expressly specified, and provided that the output of a preceding process is not used in a subsequent process. Similar sequential terms used for descriptive convenience (e.g., "firstly," "next," "secondly," "again," "then," etc.) do not imply that the actions must be performed in such an order.

[0044] Those skilled in the art will understand that all directional references (e.g., above, below, up, up, down, down, top, bottom, left, right, vertical, horizontal, etc.) are used descriptively in the drawings to aid the reader's understanding and do not imply (e.g., a limitation on the scope of the invention as defined by the appended claims) a limitation on the scope of the invention as defined by the appended claims. They are merely for the purpose of facilitating the description of this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation. The directional terms "inside" and "outside" refer to inside or outside relative to the outline of the respective component itself.

[0045] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0046] Additionally, some vague terms (e.g., substantially, certain, generally, etc.) may refer to slight inaccuracies or minor deviations in conditions, quantities, values, or dimensions, some of which are within manufacturing tolerances or limits. It should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components; unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application.

[0047] The specific embodiments described herein are merely illustrative examples illustrating the spirit of the invention. Those skilled in the art can make various modifications or additions to the described embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. Air conditioning system, including: A compressor, a four-way valve, an outdoor heat exchanger, a throttling component, and an indoor heat exchange module are sequentially connected to form a refrigerant circulation loop. The refrigerant circulation loop is equipped with a gas-liquid separator for temporarily storing liquid refrigerant. The gas-liquid separator is connected between the indoor heat exchange module and the four-way valve, and is switched between the compressor's suction side and discharge side via the four-way valve. The bottom of the gas-liquid separator's inner cavity is connected to the inlet side of the indoor heat exchange module under heating cycle conditions via a drain pipe. The first end of the gas-liquid separator is connected to the four-way valve, and the second end of the gas-liquid separator is connected to the outlet side of the indoor heat exchange module under refrigeration cycle conditions.

2. The air conditioning system according to claim 1, characterized in that, The drain pipe is connected to the first pipe between the second end of the gas-liquid separator and the indoor heat exchange module.

3. The air conditioning system according to claim 2, characterized in that, The connection point between the drain pipe and the first pipe is not higher than the height of the drain pipe opening inside the gas-liquid separator.

4. The air conditioning system according to claim 1, characterized in that, The first end of the gas-liquid separator is located at the top of the gas-liquid separator cavity. The pipe at the first end of the gas-liquid separator cavity is a U-shaped pipe, with the opening of the U-shaped pipe facing upwards and close to the top of the gas-liquid separator cavity cavity.

5. The air conditioning system according to claim 4, characterized in that, The second end of the gas-liquid separator is located at the top of the inner cavity of the gas-liquid separator. The opening of the second end in the inner cavity of the gas-liquid separator is vertically opposite to the opening of the first end and is inclined to one side.

6. The air conditioning system according to claim 4, characterized in that, The bottom of the U-shaped tube is provided with an oil return hole.

7. The air conditioning system according to claim 1, characterized in that, A control valve is installed on the drainage pipeline.

8. An air conditioning unit, characterized in that, Including the air conditioning system as described in any one of claims 1 to 7.

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