Floor heating air conditioning system and control method thereof

Abstract

The invention discloses a floor heating air-conditioning system and a control method thereof, a floor heating module in the floor heating air-conditioning system comprises a heat exchanger, a liquid pipe and an air pipe, a first bypass pipe is further arranged between the liquid pipe and the end, communicated with the heat exchanger, of the air pipe, and a first electronic expansion valve is located between the first bypass pipe and the heat exchanger; the first bypass pipe communicates with the liquid pipe and the air pipe and is provided with a first two-way valve; moreover, a first check valve is further arranged on the liquid pipe and between the first bypass pipe and the heat exchanger, the first electronic expansion valve is closer to the heat exchanger than the first check valve, and the first check valve prevents refrigerants in the liquid pipe from entering the heat exchanger. The combined action of the check valve and the bypass pipe can comprehensively prevent refrigerants from leaking into the heat exchanger during refrigeration of the air conditioner, heat exchange freezing of the heat exchanger is avoided, meanwhile, the refrigerants and engine oil in the liquid pipe can flow into the air pipe through the bypass pipe during refrigeration oil return, and therefore the phenomenon of oil and liquid accumulation in the liquid pipe is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of floor heating and air conditioning combination, and in particular relates to a floor heating and air conditioning system and a control method thereof. Background Art

[0002] With the widespread application of floor heating and air conditioning multi-split systems and the significant progress of their technology, the quality and reliability of the heat exchanger, the core component that realizes the heat exchange between the floor heating module and the air conditioning module, has an important impact on the performance and quality of floor heating. At present, in the floor heating and air conditioning multi-split system, in order to prevent the liquid refrigerant from entering the heat exchanger when the air conditioning module is cooling, an electronic expansion valve is set on the liquid pipe, but the electronic expansion valve will still leak refrigerant when it is closed, which makes the heat exchanger at risk of freezing and damage due to refrigerant leakage.

[0003] In order to solve the above-mentioned refrigerant leakage problem, the commonly used method is to install an electric valve on the liquid pipe before the electronic expansion valve. When the air-conditioning module is cooling, the refrigerant leakage can be prevented by controlling the electric valve and the electronic expansion valve to be closed at the same time. However, the disadvantage of this method is that the air-conditioning module will have an oil return stage when cooling, that is, the liquid refrigerant in the liquid pipe needs to flow into the air pipe. If the electric valve is closed during the oil return, there is a risk of oil and liquid accumulation in the liquid pipe; if the electric valve is opened during the oil return, the liquid refrigerant enters the plate heat exchanger, and the risk of heat exchange freezing still exists. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that in the prior art floor heating and air conditioning multi-split system, an electric valve is installed on the liquid pipe before the electronic expansion valve. When the air-conditioning module is cooling, if the electric valve is closed, there is a risk of oil and liquid accumulation in the liquid pipe. If the electric valve is opened, liquid refrigerant can enter the heat exchanger, resulting in the risk of heat exchange freezing.

[0005] To solve the above technical problems, an embodiment of the present invention discloses a floor heating and air-conditioning system, including an air-conditioning module and a floor heating module, the floor heating module including a heat exchanger, a liquid pipe and an air pipe, the heat exchanger and the air-conditioning module are connected through the liquid pipe and the air pipe respectively, and a first electronic expansion valve is also arranged on the liquid pipe; a first bypass pipe connecting the liquid pipe and the air pipe is also arranged between the ends of the liquid pipe and the air pipe respectively connected to the heat exchanger, and the first electronic expansion valve is located between the first bypass pipe and the heat exchanger, and a first two-way valve is arranged on the first bypass pipe; and a first check valve is also arranged on the liquid pipe between the first bypass pipe and the heat exchanger, the first electronic expansion valve is closer to the heat exchanger than the first check valve, and the first check valve blocks the refrigerant in the liquid pipe from entering the heat exchanger.

[0006] By adopting the above technical scheme, a bypass pipe with a two-way valve is arranged between the refrigerant liquid pipe and the gas pipe of the air-conditioning module, and a first check valve and an electronic expansion valve are arranged on the liquid pipe between the bypass pipe and the heat exchanger. The joint action of the check valve and the bypass pipe can fully prevent the refrigerant from leaking into the heat exchanger during air conditioning refrigeration, thereby avoiding thermal freezing of the heat exchanger. At the same time, the refrigerant and engine oil in the liquid pipe can flow into the gas pipe through the bypass pipe during refrigeration oil return, thereby avoiding the phenomenon of oil and liquid accumulation in the liquid pipe.

[0007] According to another specific embodiment of the present invention, in the floor heating and air conditioning system disclosed in the embodiment of the present invention, a second check valve is further provided on the first bypass pipe, and the second check valve blocks the refrigerant in the gas pipe from entering the liquid pipe.

[0008] By adopting the above technical solution, the flow direction of the refrigerant in the first bypass pipe from the liquid pipe to the gas pipe is limited by the second check valve, thereby preventing the refrigerant in the gas pipe from entering the liquid pipe.

[0009] According to another specific embodiment of the present invention, the floor heating and air-conditioning system disclosed in the embodiment of the present invention also includes a controller, which is respectively connected to the first two-way valve, the first electronic expansion valve and the air-conditioning module; the controller controls the opening and closing of the first two-way valve and the first electronic expansion valve according to the operation mode of the air-conditioning module.

[0010] According to another specific embodiment of the present invention, in the floor heating and air conditioning system disclosed in the embodiment of the present invention, the water inlet pipe and the water outlet pipe of the floor heating module are respectively connected to the heat exchanger, and a filter and a flow switch are sequentially arranged on the water inlet pipe from the water inlet to the heat exchanger.

[0011] According to another specific embodiment of the present invention, in the floor heating and air conditioning system disclosed in the embodiment of the present invention, a water pump, a heater, a safety valve and an expansion tank are sequentially arranged on the water outlet pipe from the water outlet to the heat exchanger.

[0012] According to another specific embodiment of the present invention, in the floor heating and air conditioning system disclosed in the embodiment of the present invention, a second bypass pipe is arranged between the water inlet pipe and the water outlet pipe, the second bypass pipe is close to the water outlet and the water inlet, and a second two-way valve is arranged on the second bypass pipe.

[0013] The present invention also provides a control method for a floor heating and air-conditioning system, which is applied to the floor heating and air-conditioning system of the present invention. The control method includes: when the air-conditioning module is in cooling operation, controlling the first two-way valve and the first electronic expansion valve to be closed to prevent the refrigerant in the liquid pipe from entering the heat exchanger; when the air-conditioning module is in cooling and oil return operation, controlling the first two-way valve to be opened and the first electronic expansion valve to be closed, and the refrigerant and engine oil in the liquid pipe enter the air pipe through the bypass pipe, and the first check valve is used to prevent the refrigerant and engine oil in the liquid pipe from entering the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1This is a structural schematic diagram of a floor heating module in a floor heating and air conditioning system according to Embodiment 1 of the present invention;

[0015] Figure 2 It is a schematic structural diagram of the floor heating module in the floor heating and air conditioning system of Example 2 of the present invention.

[0016] Description of reference numerals:

[0017] 10: Floor heating module;

[0018] 11: Heat exchanger;

[0019] 12: liquid pipe; 121: first electronic expansion valve; 122: first check valve;

[0020] 13: air pipe; 14: first bypass pipe; 141: first two-way valve; 142: second check valve;

[0021] 15: water inlet pipe; 151: water inlet; 152: filter; 153: flow switch;

[0022] 16: water outlet pipe; 161: water outlet; 162: water pump; 163: heater; 1631: exhaust valve; 164: safety valve; 165: expansion tank;

[0023] 17: second bypass pipe; 171: second two-way valve. DETAILED DESCRIPTION

[0024] In a multi-split system with air conditioning and floor heating, the floor heating module includes a heat exchanger and an electronic expansion valve. When the air conditioning module is in cooling mode, the electronic expansion valve is also closed due to the shutdown of the floor heating module, thereby preventing the liquid refrigerant of the air conditioning module from entering the heat exchanger. However, if the electronic expansion valve fails and leaks in the closed state, liquid refrigerant will enter the heat exchanger, which may cause the heat medium (i.e., water) in the heat exchanger to freeze and expand, posing a risk of damaging the heat exchanger.

[0025] The existing technology prevents refrigerant leakage by installing an electric valve before the electronic expansion valve. However, since the air-conditioning module has an oil return stage when cooling, if the electric valve is closed during the oil return, the pipeline connecting the floor heating module cannot return oil, and there is a risk of oil and liquid accumulation; if the electric valve is opened during the oil return, the liquid refrigerant enters the heat exchanger again, and the risk of heat exchange freezing still exists.

[0026] In order to solve the above problems, the present invention provides a floor heating air-conditioning system and a control method for the floor heating air-conditioning system, a bypass pipe with a two-way valve is arranged between the refrigerant liquid pipe and the gas pipe, and a first check valve and an electronic expansion valve are arranged on the liquid pipe between the bypass pipe and the heat exchanger. In this way, the combined effect of the check valve and the bypass pipe can fully prevent the refrigerant from leaking into the heat exchanger during air conditioning refrigeration, thereby avoiding thermal freezing of the heat exchanger. At the same time, during refrigeration oil return, the refrigerant and engine oil in the liquid pipe can flow into the gas pipe through the bypass pipe, thereby avoiding the phenomenon of oil and liquid accumulation in the liquid pipe.

[0027] In order to more clearly understand the floor heating and air conditioning system and the control method of the floor heating and air conditioning system provided in the present application, the specific implementation process of the floor heating and air conditioning system and the control method of the floor heating and air conditioning system is described in detail below with reference to the accompanying drawings.

[0028] Example 1

[0029] This embodiment provides a floor heating and air conditioning system, including an air conditioning module and a floor heating module. Figure 1 As shown, the floor heating module 10 includes a heat exchanger 11, a liquid pipe 12 and an air pipe 13, and the heat exchanger 11 is connected to the air conditioning module (not shown in the figure) through the liquid pipe 12 and the air pipe 13. Specifically, the air conditioning module generally includes an outdoor unit and an indoor unit, and the outdoor unit includes a compressor. The heat exchanger 11 of the floor heating module 10 is connected to the air conditioning module through the liquid pipe 12 and the air pipe 13, and the refrigerant (such as Freon) of the air conditioning module can enter and exit the heat exchanger 11 through the air pipe 13 and the liquid pipe 12, respectively, wherein the heat exchanger 11 can be specifically a plate heat exchanger.

[0030] like Figure 1 As shown, a first bypass pipe 14 is further provided between the ends of the liquid pipe 12 and the gas pipe 13 respectively connected to the heat exchanger 11. The first bypass pipe 14 connects the liquid pipe 12 and the gas pipe 13, and a first two-way valve 141 is provided thereon; and a first check valve 122 and a first electronic expansion valve 121 are further provided on the liquid pipe 12 between the first bypass pipe 14 and the heat exchanger 11. The first electronic expansion valve 121 is closer to the heat exchanger 11 than the first check valve 122. The first check valve 122 only allows the flow from the heat exchanger 11 to the liquid pipe 12, and blocks the refrigerant in the liquid pipe 12 from entering the heat exchanger 11. In one specific embodiment, the first two-way valve 141 is an electric valve.

[0031] In one specific embodiment, the floor heating air-conditioning system also includes a controller (not shown in the drawings), which is respectively connected to the first two-way valve 141, the first electronic expansion valve 121 and the air-conditioning module, and controls the opening and closing of the first two-way valve 141 and the first electronic expansion valve 121 according to the operation mode of the air-conditioning module.

[0032] Further, if Figure 1As shown, the floor heating module 10 has a water inlet pipe 15 and a water outlet pipe 16, which are respectively connected to the heat exchanger 11, and the floor heating module 10 has a heat medium (i.e., water). In one specific embodiment, the water inlet pipe 15 is provided with a filter 152 and a flow switch 153 in sequence from the water inlet 151 to the heat exchanger 11; specifically, the filter 152 can be a Y-type filter for removing impurities in the heat medium; the flow switch 153 is used to monitor the flow of the heat medium in the water inlet pipe 15.

[0033] In one specific embodiment, Figure 1 As shown, a water pump 162, a heater 163, a safety valve 164 and an expansion tank 165 are sequentially arranged on the water outlet pipe 16 from the water outlet 161 to the heat exchanger 11. Specifically, the heat medium flows out of the heat exchanger 11 and enters the water outlet pipe 16. The water outlet pipe 16 is connected with an expansion tank 165 to stabilize the pressure in the pipeline of the floor heating module 10. The water outlet pipe 16 is also provided with a safety valve 164 to prevent excessive pressure and improve the safety of the floor heating module 10; the heater 163 is used to heat the heat medium after heat exchange to reach the target temperature, and the heater 163 is also provided with an exhaust valve 1631 to exhaust the gas in the pipeline to maintain the normal operation of the pipeline system; the water pump 162 is used to ensure the fluidity of the heat medium in the pipeline.

[0034] In one specific embodiment, Figure 1 As shown, a second bypass pipe 17 is provided between the water inlet pipe 15 and the water outlet pipe 16 . The second bypass pipe 17 is close to the water outlet 161 and the water inlet 151 , and is provided with a second two-way valve 171 .

[0035] The present embodiment also provides a control method for a floor heating air conditioning system, including: when the air conditioning module is in cooling operation, the refrigerant circulates in the air conditioning module and enters the liquid pipe 12; the first two-way valve 141 is controlled to be closed, so that the first bypass pipe 14 is closed, and the refrigerant is prevented from entering the heat exchanger 11 through the first bypass pipe 14; the first electronic expansion valve 121 is controlled to be closed, so that the liquid pipe 12 and the heat exchanger 11 are in a disconnected state, and the electronic expansion valve is provided with a first check valve 122, which is equivalent to being fully closed when the refrigerant flows in the reverse direction, effectively blocking the refrigerant in the liquid pipe 12 from entering the heat exchanger 11, and the first check valve 122 and the first electronic expansion valve 121 work together to prevent the refrigerant in the liquid pipe 12 from directly entering the heat exchanger 11. Therefore, the present invention prevents the liquid refrigerant in the liquid pipe 12 from entering the heat exchanger 11 by controlling the first two-way valve 141, the first check valve 122 and the first electronic expansion valve 121, thereby eliminating the risk of freezing of the heat exchanger 11.

[0036] When the air conditioning module is cooling and returning oil, the first two-way valve 141 is controlled to open, so that the first bypass pipe 14 is connected, so that the refrigerant and oil in the liquid pipe 12 enter the gas pipe 13 through the first bypass pipe 14 to flow back to the compressor of the air conditioning module; at the same time, the first electronic expansion valve 121 is controlled to close, and the refrigerant and oil in the liquid pipe 12 are blocked from entering the heat exchanger 11 through the first check valve 122 and the first electronic expansion valve 121. Therefore, the floor heating air conditioning system of the present invention can not only make the oil in the liquid pipe 12 return to the compressor to avoid the phenomenon of oil and liquid accumulation, but also prevent the liquid refrigerant from flowing into the heat exchanger 11.

[0037] The floor heating air conditioning system provided in this embodiment can fully and effectively protect the heat exchanger when the air conditioner is cooling, greatly reduce the risk of heat exchanger freezing, and avoid the phenomenon of oil and liquid accumulation, thereby improving the reliability of the floor heating module.

[0038] Example 2

[0039] This embodiment provides a floor heating and air conditioning system, including an air conditioning module and a floor heating module. Based on the structure of the floor heating and air conditioning system in Embodiment 1, Figure 2 As shown, the first bypass pipe 14 is also provided with a second check valve 142, which is closer to the air pipe 13 than the first two-way valve 141. The second check valve 142 only allows the flow from the liquid pipe 12 to the air pipe 13 in the first bypass pipe 14, and blocks the refrigerant in the air pipe 13 from entering the liquid pipe 12. That is, in this embodiment, when the first two-way valve 141 is controlled to open, the flow direction of the refrigerant from the liquid pipe 12 to the air pipe 13 is restricted by the second check valve 142, and the refrigerant in the air pipe 13 is prevented from entering the liquid pipe 12. Further, when the air conditioning module and the floor heating module 10 are heating, the refrigerant can also be effectively prevented from flowing from the air pipe 13 into the first bypass pipe 14.

[0040] It should be noted that, in addition to the implementation methods of the present invention described in the above-mentioned specific embodiments, those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention is introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation method. On the contrary, the purpose of introducing the invention in conjunction with the implementation method is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the above description contains many specific details, and the present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0041] It should be noted that in this specification, like reference numerals and letters refer to similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0042] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0043] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0044] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0045] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above is a further detailed description of the present invention in conjunction with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A floor heating and air conditioning system, comprising an air conditioning module and a floor heating module, wherein the floor heating module comprises a heat exchanger, a liquid pipe and an air pipe, wherein the heat exchanger and the air conditioning module are connected through the liquid pipe and the air pipe respectively, and a first electronic expansion valve is further arranged on the liquid pipe; characterized in that: A first bypass pipe communicating with the liquid pipe and the gas pipe is further provided between the ends of the liquid pipe and the gas pipe respectively communicating with the heat exchanger, and the first electronic expansion valve is located between the first bypass pipe and the heat exchanger, and a first two-way valve is provided on the first bypass pipe; and, A first check valve is provided on the liquid pipe between the first bypass pipe and the heat exchanger, and the first electronic expansion valve is closer to the heat exchanger than the first check valve. The first check valve blocks the refrigerant in the liquid pipe from entering the heat exchanger.

2. The floor heating and air conditioning system according to claim 1, characterized in that: The first bypass pipe is also provided with a second check valve, and the second check valve blocks the refrigerant in the gas pipe from entering the liquid pipe.

3. The floor heating and air conditioning system according to claim 2, characterized in that: It also includes a controller, which is respectively connected to the first two-way valve, the first electronic expansion valve and the air-conditioning module; the controller controls the opening and closing of the first two-way valve and the first electronic expansion valve according to the operation mode of the air-conditioning module.

4. The floor heating and air conditioning system according to claim 1, characterized in that: The water inlet pipe and the water outlet pipe of the floor heating module are respectively connected to the heat exchanger, and the water inlet pipe is provided with a filter and a flow switch in sequence from the water inlet to the heat exchanger.

5. The floor heating and air conditioning system according to claim 4, characterized in that: A water pump, a heater, a safety valve and an expansion tank are sequentially arranged on the water outlet pipe from the water outlet to the heat exchanger.

6. The floor heating and air conditioning system according to claim 5, characterized in that: A second bypass pipe is arranged between the water inlet pipe and the water outlet pipe, two ends of the second bypass pipe are respectively close to the water outlet and the water inlet, and a second two-way valve is arranged on the second bypass pipe.

7. A control method for a floor heating and air conditioning system, characterized in that: Applicable to the floor heating air conditioning system according to any one of claims 1 to 6; the control method comprises: when the air conditioning module is in cooling operation, controlling the first two-way valve and the first electronic expansion valve to close to prevent the refrigerant in the liquid pipe from entering the heat exchanger; When the air conditioning module cools and returns oil, the first two-way valve is controlled to open and the first electronic expansion valve is controlled to close, the refrigerant and oil in the liquid pipe enter the air pipe through the first bypass pipe, and the first check valve is used to block the refrigerant and oil in the liquid pipe from entering the heat exchanger.

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