Air conditioning unit

Abstract

The application provides an air conditioning unit, which comprises an indoor unit, an outdoor unit, a first communication pipe, a second communication pipe and a liquid pipe for communicating the indoor unit with the outdoor unit. The air conditioning unit provided by the application uses two four-way valves in series to realize switching of the air conditioning system in multiple modes, thereby canceling the capillary tube at the communication port of the four-way valve, effectively avoiding the high and low pressure gas leakage problem of the air conditioning unit, and improving the system energy efficiency of the air conditioning unit. When the air conditioning unit has a floor heating mechanism, the switching of the two four-way valves enables the floor heating mechanism to provide defrosting energy for the outdoor unit. Since the specific heat capacity of water in the floor heating mechanism is larger than the specific heat capacity of air, compared with the traditional defrosting mode of taking heat through the indoor unit, the indoor temperature decreases less, and the user experience is better. Meanwhile, in the defrosting mode, the refrigerant does not flow through the indoor unit, thereby effectively reducing the noise generated by the indoor unit, and further improving the user experience.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air treatment equipment, in particular to an air conditioning unit. BACKGROUND

[0002] With the continuous improvement of people's living standards, through the installation of air conditioning system in the living and indoor working environment, in order to improve the comfort of living and working environment, become an important choice for people to improve the comfort demand. Among them, the multi-split air conditioning technology has the advantages of free control, high efficiency, energy saving, convenient installation and maintenance, etc., which is an important direction of air conditioning development. The current company adopts an integrated two-supply multi-split outdoor unit system scheme, which uses a double four-way valve parallel structure, but in order to protect the valve pressure and prevent the four-way valve from accumulating liquid, a section of capillary throttling will be equipped at the C port or E port of each four-way valve. This structure will cause high and low pressure gas leakage, thereby affecting the overall efficiency of the machine. SUMMARY

[0003] In order to solve the technical problem of high and low pressure gas leakage caused by the capillary set at the communication port of the four-way valve in the prior art, an air conditioning unit is provided, in which two four-way valves are connected in series to avoid pressure leakage.

[0004] An air conditioning unit, comprising an indoor unit, an outdoor unit, and a first communication pipe, a second communication pipe and a liquid pipe for communicating the indoor unit and the outdoor unit, the second communication pipe is in communication with the exhaust port of the compressor of the outdoor unit, the outdoor unit comprises a first four-way valve and a second four-way valve, the first four-way valve has a D port, an E port, an S port and a C port, the second four-way valve has a D' port, an E' port, an S' port and a C' port, the D port is in communication with the exhaust port of the compressor, the C port is in communication with the outdoor heat exchanger of the outdoor unit, the E port is in communication with the D' port, the S port and the S' port are in communication with the gas return port of the compressor, the C' port is in communication with the first communication pipe, and the E' port is in communication with the liquid pipe through a control mechanism.

[0005] The control mechanism comprises a throttling mechanism, and the E' port is in communication with the liquid pipe through the throttling mechanism.

[0006] The indoor unit comprises at least a floor heating mechanism, and the outdoor unit comprises a floor heating heat exchanger, the floor heating heat exchanger has a first heat exchange member and a second heat exchange member in heat exchange with each other, the first heat exchange member is in communication with the floor heating mechanism to form a water circulation system, and the E' port is in communication with the throttling mechanism through the second heat exchange member.

[0007] The air conditioning unit has a defrosting mode, in the defrosting mode, the D port of the first four-way valve is in communication with the C port, the E' port of the second four-way valve is in communication with the S' port, the throttling mechanism is dynamically adjusted, and the indoor unit stops working.

[0008] The air conditioning unit has a floor heating mode, the D port of the first four-way valve is in communication with the E port, the C port is in communication with the S port, the D' port of the second four-way valve is in communication with the E' port, the throttling mechanism is dynamically adjusted, and the indoor unit exchanges heat or stops working according to a preset working condition.

[0009] The throttling mechanism comprises an electronic expansion valve, and the electronic expansion valve has a closed state and a state of opening degree dynamic adjustment.

[0010] The air conditioning unit has a refrigeration mode, in which the D port of the first four-way valve is in communication with the C port, the E port is in communication with the S port, the D' port of the second four-way valve is in communication with the C' port, the control mechanism is switched to a disconnected state, and the indoor unit exchanges heat or stops working according to a preset working condition.

[0011] The air conditioning unit has a heating mode, in which the D port of the first four-way valve is in communication with the E port, the C port is in communication with the S port, the D' port of the second four-way valve is in communication with the C' port, the control mechanism is switched to a disconnected state, and the indoor unit exchanges heat or stops working according to a preset working condition.

[0012] The air conditioning unit has a reheating and dehumidifying mode, in which the D port of the first four-way valve is in communication with the C port, the E port is in communication with the S port, the D' port of the second four-way valve is in communication with the C' port, the control mechanism is switched to a disconnected state, part of the heat exchange mechanisms in the indoor unit are switched to dehumidify, and part of the heat exchange mechanisms are switched to heat.

[0013] The indoor unit comprises a three-tube indoor mechanism, the three-tube indoor mechanism comprises a first heat exchanger and a second heat exchanger, one end of the first heat exchanger is in communication with the first communication pipe, the other end of the first heat exchanger is in communication with the liquid pipe through a first throttling mechanism, one end of the second heat exchanger is in communication with the second communication pipe, the other end of the second heat exchanger is in communication with the liquid pipe through a second throttling mechanism, and in the reheating and dehumidifying mode, the first throttling mechanism and the second throttling mechanism are dynamically adjusted.

[0014] The air conditioning unit provided by the application utilizes two four-way valves in series to realize switching of the air conditioning system in multiple modes, thereby canceling the capillary tube at the communication port of the four-way valve, effectively avoiding the high and low pressure gas leakage problem of the air conditioning unit, and improving the system energy efficiency of the air conditioning unit. When the ground heating mechanism exists in the air conditioning unit, the switching of the two four-way valves makes the ground heating mechanism provide defrosting energy for the outdoor unit. Since the specific heat capacity of water in the ground heating mechanism is larger than the specific heat capacity of air, compared with the traditional defrosting mode of taking heat through the indoor unit, the indoor temperature decreases less, and the user experience is better. At the same time, in the defrosting mode of the air conditioning unit, the refrigerant does not flow through the indoor unit, thereby effectively reducing the noise generated by the indoor unit, and further improving the user experience. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The structure schematic diagram of the air conditioning unit provided by the embodiment of the application is shown in the figure.

[0016] Figure 2 The partial schematic diagram of the air conditioning unit is shown in the figure. Figure 1

[0017] Figure 3 The refrigerant flow path diagram of the air conditioning unit in the defrosting mode provided by the embodiment of the application is shown in the figure.

[0018] Figure 4 The refrigerant flow path diagram of the air conditioning unit in the ground heating mode provided by the embodiment of the application is shown in the figure.

[0019] Figure 5 The partial schematic diagram of the air conditioning unit is shown in the figure. Figure 4

[0020] Figure 6 The refrigerant flow path diagram of the air conditioning unit in the heating mode provided by the embodiment of the application is shown in the figure.

[0021] Figure 7 The refrigerant flow path diagram of the air conditioning unit in the refrigeration mode or reheating and dehumidification mode provided by the embodiment of the application is shown in the figure.

[0022] In the figure:

[0023] 1, indoor unit; 2, outdoor unit; 3, first communication pipe; 4, second communication pipe; 5, liquid pipe; 6, first four-way valve; 7, second four-way valve; 8, outdoor heat exchanger; 9, compressor; 10, control mechanism; 11, ground heating mechanism; 12, ground heating heat exchanger; 121, first heat exchange element; 122, second heat exchange element; 13, first heat exchanger; 14, second heat exchanger. DETAILED DESCRIPTION

[0024] ​​To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0025] like Figures 1 to 7 The air conditioning unit shown includes an indoor unit 1, an outdoor unit 2, and a first connecting pipe 3, a second connecting pipe 4, and a liquid pipe 5 for connecting the indoor unit 1 and the outdoor unit 2. The second connecting pipe 4 is connected to the exhaust port of the compressor 9 of the outdoor unit 2. The outdoor unit 2 includes a first four-way valve 6 and a second four-way valve 7. The first four-way valve 6 has a D port, an E port, an S port, and a C port. The second four-way valve 7 has a D' port, an E' port, an S' port, and a C' port. The D port is connected to the exhaust port of the compressor 9. The C port is connected to the outdoor heat exchanger 8 of the outdoor unit 2. The E port is connected to the D' port. The S port and the S' port are both connected to the return port of the compressor 9. The C' port is connected to the first connecting pipe 3. The E' port is connected to the liquid pipe 5 through a control mechanism 10. The first four-way valve 6 and the second four-way valve 7 are connected in series. This series connection allows for switching between cooling, heating, and underfloor heating modes in the multi-split system. Specifically, the capillary tube at the connection port of the existing four-way valves is eliminated. Instead, the E port of the first four-way valve 6 is connected to the D port of the second four-way valve 7. Simultaneously, the E' port of the second four-way valve 7 is connected to the liquid pipe 5 via the control mechanism 10. This eliminates the need for a capillary tube at the E port of the first four-way valve 6. The E' port of the second four-way valve 7 can be connected and disconnected from the liquid pipe 5 under the control of the control mechanism 10. When the control mechanism 10 is disconnected, there is no refrigerant flow between the E' port of the second four-way valve 7 and the liquid pipe 5. When the control mechanism 10 is connected, refrigerant can flow between the E' port of the second four-way valve 7 and the liquid pipe 5. Furthermore, the opening degree of the control mechanism 10 is adjustable to regulate the refrigerant flow. In other words, eliminating the capillary tube at the two four-way valves improves system energy efficiency and enhances the user experience. The arrows in the diagram indicate the direction of refrigerant flow.

[0026] Specifically, the control mechanism 10 includes a throttling mechanism, and the E' port is connected to the liquid pipe 5 through the throttling mechanism. In particular, the throttling mechanism includes an electronic expansion valve, which has a closed state and a dynamically adjustable opening state. When the throttling mechanism (electronic expansion valve) is in the closed state, the E' port of the second four-way valve 7 cannot connect to the liquid pipe 5. However, when in the dynamically adjustable opening state, the throttling mechanism (electronic expansion valve) can throttle the refrigerant flowing between the E' port and the liquid pipe 5. This avoids the pressure leakage problem caused by the capillary tube at the E' port, and also allows the E' port of the second four-way valve 7 to be utilized to increase the operating modes of the air conditioning unit.

[0027] The indoor unit 1 comprises at least a floor heating mechanism 11, and the outdoor unit 2 comprises a floor heating heat exchanger 12, which has a first heat exchange element 121 and a second heat exchange element 122 that exchange heat with each other. The first heat exchange element 121 is in communication with the floor heating mechanism 11 to form a water circulation system, and the E' port is in communication with the throttling mechanism through the second heat exchange element 122. The refrigerant in the second heat exchange element 122 can exchange heat with the water in the first heat exchange element 121, so that the refrigerant flowing through the second heat exchange element 122 can absorb or release heat in the floor heating heat exchanger 12.

[0028] As shown in Figure 2 and Figure 3 , the air conditioning unit has a defrosting mode, in which the D port of the first four-way valve 6 is in communication with the C port, the E' port of the second four-way valve 7 is in communication with the S' port, the throttling mechanism is dynamically adjusted, and the indoor unit 1 stops working. The refrigerant discharged by the compressor 9 flows through the D port and the C port of the first four-way valve 6 in turn, flows to the outdoor heat exchanger 8, defrosts the outdoor heat exchanger 8, enters the liquid pipe 5, and then enters the floor heating heat exchanger 12 under the throttling action of the throttling mechanism. When flowing through the second heat exchange element 122, it exchanges heat with the hot water in the first heat exchange element 121, so that the refrigerant in the second heat exchange element 122 absorbs heat from the floor heating mechanism 11, and then flows back to the compressor 9 through the E' port and the D' port of the second four-way valve 7 in turn to complete the defrosting cycle. Because the specific heat capacity of water in the floor heating mechanism 11 is larger than that of air, compared with the traditional defrosting mode of taking heat from the indoor unit, the indoor temperature decreases less, and the user experience is better. At the same time, in the defrosting mode of the air conditioning unit, no refrigerant flows through the indoor unit 1, so that the noise generated by the indoor unit is effectively reduced, and the user experience is further improved.

[0029] Preferably, the floor heating heat exchanger 12 is a double-pipe heat exchanger, the inner pipe of the double-pipe heat exchanger constitutes the first heat exchange element 121, and the space between the outer pipe and the inner pipe constitutes the second heat exchange element 122; or the inner pipe of the double-pipe heat exchanger constitutes the second heat exchange element 122, and the space between the outer pipe and the inner pipe constitutes the first heat exchange element 121.

[0030] As shown in Figure 4 and Figure 5As shown, the air conditioning unit has a floor heating mode, the D port of the first four-way valve 6 communicates with the E port, the C port communicates with the S port, the D' port of the second four-way valve 7 communicates with the E' port, the throttling mechanism is dynamically adjusted, and the indoor unit 1 exchanges heat or stops working according to the preset working condition. The exhaust gas of the compressor 9 enters the second heat exchange member 122 through the D port, the E port of the first four-way valve 6, the D' port and the E' port of the second four-way valve 7 in sequence, and then flows to the liquid pipe 5 through the throttling mechanism after passing through the second heat exchange member 122. The refrigerant in the liquid pipe 5 passes through the outdoor heat exchanger 8, and then returns to the compressor 9 through the C port and the S port of the first four-way valve 6 after passing through the second heat exchange member 122, completing the floor heating heating cycle. At the same time, the water in the floor heating mechanism 11 circulates into the first heat exchange member 121, the refrigerant in the second heat exchange member 122 heats the water in the first heat exchange member 121, and finally the floor heating mechanism 11 achieves the purpose of heating.

[0031] As shown in Figure 7 , the air conditioning unit has a refrigeration mode, in which the D port of the first four-way valve 6 communicates with the C port, the E port communicates with the S port, the D' port of the second four-way valve 7 communicates with the C' port, the control mechanism 10 is switched to the open state, and the indoor unit 1 exchanges heat or stops working according to the preset working condition. The exhaust gas of the compressor 9 enters the outdoor heat exchanger 8 through the D port and the C port of the first four-way valve 6, and finally flows to the liquid pipe 5. The indoor unit 1 obtains refrigerant from the liquid pipe 5 according to the user's demand, and operates according to the preset working condition (cooling working condition, etc.) of the indoor unit 1, so as to realize the refrigeration of the indoor. The refrigerant flowing out of the indoor unit 1 returns to the compressor 9 through the first communication pipe 3, the C' port and the D' port of the second four-way valve 7, and the E port and the S port of the first four-way valve 6 in sequence, completing the refrigeration heat exchange cycle of the air conditioning unit.

[0032] As shown in Figure 6 , the air conditioning unit has a heating mode, in which the D port of the first four-way valve 6 communicates with the E port, the C port communicates with the S port, the D' port of the second four-way valve 7 communicates with the C' port, the control mechanism 10 is switched to the open state, and the indoor unit 1 exchanges heat or stops working according to the preset working condition. The exhaust gas of the compressor 9 is divided into two parts, one part enters the second communication pipe 4, and the other part enters the first communication pipe 3 through the D port, the E port of the first four-way valve 6, the D' port and the C' port of the second four-way valve 7 in sequence. The indoor unit 1 obtains refrigerant from the second communication pipe 4 and / or the first communication pipe 3 according to the user's demand, and operates according to the preset working condition (heating working condition, etc.) of the indoor unit 1, so as to realize the heating of the indoor. The refrigerant flowing out of the indoor unit 1 returns to the compressor 9 through the liquid pipe 5, the outdoor heat exchanger 8, the C port and the S port of the first four-way valve 6 in sequence, completing the heating cycle of the air conditioning unit.

[0033] When the indoor unit 1 comprises a three-tube indoor unit 1 structure, since the three-tube indoor unit has the first heat exchanger 13 and the second heat exchanger 14 arranged side by side, one end of the first heat exchanger 13 is communicated with the first communicating tube 3, and one end of the second heat exchanger 14 is communicated with the second communicating tube 4. When the first heat exchanger 13 and the second heat exchanger 14 are both in the heating working condition, the indoor unit 1 obtains refrigerant from the second communicating tube 4 and the first communicating tube 3 to perform heating according to the user's demand. When only the first heat exchanger 13 is in the heating working condition, the indoor unit 1 obtains refrigerant from the first communicating tube 3 to perform heating according to the user's demand. When only the second heat exchanger 14 is in the heating working condition, the indoor unit 1 obtains refrigerant from the second communicating tube 4 to perform heating according to the user's demand.

[0034] As shown in Figure 7 the reheat dehumidification mode, the D port of the first four-way valve 6 is communicated with the C port, and the E port is communicated with the S port. The D' port of the second four-way valve 7 is communicated with the C' port. The control mechanism 10 is switched to the open state. Part of the heat exchange mechanism in the indoor unit 1 is switched to perform dehumidification, and part of the heat exchange mechanism is switched to perform heating. The exhaust of the compressor 9 is divided into two parts. One part sequentially passes through the D port and the C port of the first four-way valve 6, enters the outdoor heat exchanger 8, and finally flows to the liquid tube 5. The other part is directly sent to the second communicating tube 4. Part of the heat exchange mechanism in the indoor unit 1 obtains refrigerant from the liquid tube 5 to perform dehumidification, and part of the heat exchange mechanism obtains refrigerant from the second communicating tube 4 to perform heating. All the refrigerant finally flows back to the first communicating tube 3, sequentially flows back to the compressor 9 through the C' port and the D' port of the second four-way valve 7 and the E port and the S port of the first four-way valve 6, and completes the reheat dehumidification mode of the air conditioning unit.

[0035] Specifically, the indoor unit 1 comprises a three-tube indoor unit 1 structure, which comprises a first heat exchanger 13 and a second heat exchanger 14. One end of the first heat exchanger 13 is communicated with the first communicating tube 3, and the other end of the first heat exchanger 13 is communicated with the liquid tube 5 through a first throttling mechanism. One end of the second heat exchanger 14 is communicated with the second communicating tube 4, and the other end of the second heat exchanger 14 is communicated with the liquid tube 5 through a second throttling mechanism. In the reheat dehumidification mode, the first throttling mechanism and the second throttling mechanism are both dynamically adjusted. The refrigerant in the liquid tube 5 flows into the first heat exchanger 13 to perform refrigeration and dehumidification through the throttling action of the first throttling mechanism. The refrigerant in the second communicating tube 4 flows into the second heat exchanger 14 to perform heating and realize gas reheating demand through the throttling action of the second throttling mechanism, thereby completing the reheat dehumidification process of the air conditioning unit.

[0036] Optionally, the air conditioning unit further comprises a hot water mechanism, which can obtain refrigerant in the second communicating tube 4 or the liquid tube 5 to produce hot water.

[0037] The above embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but cannot be understood as a limitation on the patent scope of the present application. It should be noted that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An air conditioning unit comprising an indoor unit (1), an outdoor unit (2), and a first communication pipe (3), a second communication pipe (4), and a liquid pipe (5) for communicating the indoor unit (1) with the outdoor unit (2), the second communication pipe (4) communicating with a discharge port of a compressor (9) of the outdoor unit (2), characterized in that: The outdoor unit (2) comprises a first four-way valve (6) and a second four-way valve (7), the first four-way valve (6) has a D port, an E port, an S port and a C port, the second four-way valve (7) has a D' port, an E' port, an S' port and a C' port, the D port communicates with the exhaust port of the compressor (9), the C port communicates with the outdoor heat exchanger (8) of the outdoor unit (2), the E port communicates with the D' port, the S port and the S' port both communicate with the back gas port of the compressor (9), the C' port communicates with the first communication pipe (3), and the E' port communicates with the liquid pipe (5) through a control mechanism (10).

2. The air conditioning unit of claim 1, wherein: The control mechanism (10) comprises a throttling mechanism, and the E' port communicates with the liquid pipe (5) through the throttling mechanism.

3. The air conditioning unit of claim 2, wherein: The indoor unit (1) at least comprises a floor heating mechanism (11), the outdoor unit (2) comprises a floor heating heat exchanger (12), the floor heating heat exchanger (12) has a first heat exchange part (121) and a second heat exchange part (122) which exchange heat with each other, the first heat exchange part (121) communicates with the floor heating mechanism (11) to constitute a water circulation system, and the E' port communicates with the throttling mechanism through the second heat exchange part (122).

4. The air conditioning unit of claim 3, wherein: The air conditioning unit has a defrosting mode, in the defrosting mode, the D port of the first four-way valve (6) communicates with the C port, the E' port of the second four-way valve (7) communicates with the S' port, the throttling mechanism is dynamically adjusted, and the indoor unit (1) stops working.

5. The air conditioning unit of claim 3, wherein: The air conditioning unit has a floor heating mode, in the floor heating mode, the D port of the first four-way valve (6) communicates with the E port, and the C port communicates with the S port, the D' port of the second four-way valve (7) communicates with the E' port, the throttling mechanism is dynamically adjusted, and the indoor unit (1) exchanges heat or stops working according to a preset working condition.

6. The air conditioning unit of claim 3, wherein: The throttling mechanism comprises an electronic expansion valve, and the electronic expansion valve has a closed state and a state of opening degree dynamic adjustment.

7. The air conditioning unit of claim 1, wherein: The air conditioning unit has a refrigeration mode, in the refrigeration mode, the D port of the first four-way valve (6) communicates with the C port, and the E port communicates with the S port, the D' port of the second four-way valve (7) communicates with the C' port, the control mechanism (10) is switched to a disconnected state, and the indoor unit (1) exchanges heat or stops working according to a preset working condition.

8. The air conditioning unit of claim 1, wherein: The air conditioning unit has a heating mode, in the heating mode, the D port of the first four-way valve (6) communicates with the E port, and the C port communicates with the S port, the D' port of the second four-way valve (7) communicates with the C' port, the control mechanism (10) is switched to a disconnected state, and the indoor unit (1) exchanges heat or stops working according to a preset working condition.

9. The air conditioning unit of claim 1, wherein: The air conditioning unit has a reheating and dehumidifying mode, in the reheating and dehumidifying mode, the D port of the first four-way valve (6) communicates with the C port, and the E port communicates with the S port, the D' port of the second four-way valve (7) communicates with the C' port, the control mechanism (10) is switched to a disconnected state, and part of the heat exchange mechanisms in the indoor unit (1) are switched to dehumidify, and part of the heat exchange mechanisms are switched to heat.

10. The air conditioning unit of claim 9, wherein: The indoor unit (1) comprises a three-tube indoor unit, which comprises a first heat exchanger (13) and a second heat exchanger (14), one end of the first heat exchanger (13) communicates with the first communicating pipe (3), the other end of the first heat exchanger (13) communicates with the liquid pipe (5) through a first throttling mechanism, one end of the second heat exchanger (14) communicates with the second communicating pipe (4), the other end of the second heat exchanger (14) communicates with the liquid pipe (5) through a second throttling mechanism, in the reheating dehumidification mode, the first throttling mechanism and the second throttling mechanism are dynamically adjusted.

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