Heating equipment and control method thereof

Abstract

The invention provides heating equipment and a control method thereof. The heating equipment comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger, a first throttling valve, a floor heating heat exchanger, a second throttling valve, a first pipeline, a second pipeline, a third pipeline, a one-way valve and a switching valve, and the first pipeline and the second pipeline are arranged in parallel; the indoor heat exchanger and the first throttling valve are both arranged on the first pipeline, the floor heating heat exchanger and the second throttling valve are both arranged on the second pipeline, and the second throttling valve is located on the downstream side of the floor heating heat exchanger in the flowing direction of refrigerants. The one-way valve and the switch valve are arranged on the third pipeline, the first end of the third pipeline is connected to the inlet side of the floor heating heat exchanger, the second end of the third pipeline is connected to the first position of the first pipeline and communicates with the first pipeline, and the first position is located between the indoor heat exchanger and the first throttling valve. The one-way valve is in one-way conduction in the direction from the second end of the third pipeline to the first end of the third pipeline. According to the heating equipment, heat recovery is conducted through heating and floor heating combined heating, heat loss is reduced, the energy utilization rate is increased, and energy saving is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of heating equipment, and in particular to a heating equipment and a control method thereof. Background Art

[0002] In recent years, with the EU's emphasis on renewable energy and energy efficiency standards, and consumers' increasing attention to environmentally friendly and energy-saving products, the sales of efficient and environmentally friendly heating equipment have shown an upward trend. Air source heat pumps have been widely promoted and applied, especially in the EU market, due to their high efficiency. At the same time, with the maturity of technology, more and more families have higher and higher requirements for the comfort of heating equipment. Therefore, efficient, energy-saving and comfortable heating equipment is favored by the EU market.

[0003] Floor heating is one of the heating methods that best meets the physiological needs of the human body. The indoor temperature is evenly distributed and the room temperature gradually decreases from bottom to top. The increase in indoor temperature is mainly achieved by the radiation transfer of heat from the floor. Therefore, the indoor temperature is distributed in a way that gradually decreases from bottom to top, which meets the physiological needs of the human body, makes the human body feel comfortable, and maximizes the use of energy to achieve energy saving. However, the heating time is long and cannot meet the demand for rapid heating when the machine is turned on.

[0004] Heating can achieve rapid temperature rise and provide the target temperature in a short time to meet consumers' needs for quick heating. However, due to uneven temperature distribution, it does not conform to human physiology and cannot maximize energy utilization, so human comfort is poor. Summary of the invention

[0005] The first object of the present invention is to provide a heating device that recovers heat through combined heating of heating and floor heating, reduces heat loss, improves energy utilization, and achieves energy saving.

[0006] The second object of the present invention is to provide a control method for the above heating equipment.

[0007] The third object of the present invention is to provide another control method of the above heating equipment.

[0008] To achieve the above-mentioned first purpose, the present invention provides a heating device, comprising a compressor, an indoor heat exchanger, an outdoor heat exchanger and a first throttle valve; the compressor, the indoor heat exchanger and the outdoor heat exchanger are connected in sequence to form a refrigerant circulation system, and the first throttle valve is located between the indoor heat exchanger and the outdoor heat exchanger; the heating device also includes a floor heating heat exchanger, a second throttle valve, a first pipeline, a second pipeline, a third pipeline, a one-way valve and a switch valve; the first pipeline and the second pipeline are arranged in parallel, the two ends of the first pipeline are respectively connected to the outdoor heat exchanger and the compressor, and the two ends of the second pipeline are respectively connected to the outdoor heat exchanger and The compressor is connected; the indoor heat exchanger and the first throttle valve are both arranged on the first pipeline, the floor heating heat exchanger and the second throttle valve are both arranged on the second pipeline, and the second throttle valve is located on the downstream side of the floor heating heat exchanger along the flow direction of the refrigerant; the one-way valve and the switch valve are arranged on the third pipeline, the first end of the third pipeline is connected to the inlet side of the floor heating heat exchanger, the second end of the third pipeline is connected to the first position of the first pipeline and is connected to the first pipeline, the first position is located between the indoor heat exchanger and the first throttle valve, and the one-way valve is unidirectional from the second end of the third pipeline to the first end of the third pipeline.

[0009] As can be seen from the above scheme, the present invention sets the indoor heat exchanger and the floor heating heat exchanger in parallel, and the indoor heat exchanger and the floor heating heat exchanger can heat individually or together. When the refrigerant temperature at the heating outlet reaches the preset temperature value, the floor heating heat exchanger is turned on and the refrigerant coming out of the indoor heat exchanger is recovered. The refrigerant coming out of the indoor heat exchanger can realize secondary heat exchange in the floor heating heat exchanger, and the heating and floor heating are combined, and the two are combined for heating, that is, rapid heating is achieved, and human comfort is satisfied, while maximizing energy utilization. In addition, since the refrigerant temperatures required for heating and floor heating are different, the present invention realizes independent control of the refrigerant temperatures of the two routes by controlling the first throttle valve, the second throttle valve and the switch valve to achieve the purpose of combined heating. The refrigerant temperature required for heating is higher than that for floor heating. By controlling part of the refrigerant passing through the heating flow path to re-enter the floor heating flow, the purpose of secondary heat exchange is achieved, energy utilization is maximized, energy saving is achieved, and human comfort is improved. At the same time, in the heating equipment of the present invention, the heating and floor heating systems are crossed, and heat recovery can be performed once to improve energy utilization. In addition, compared with the existing floor heating method of heating water through heat exchange between refrigerant and water, the floor heating of the present invention directly uses refrigerant radiation heat exchange, avoiding energy loss caused by heat exchange with water and then radiation heat exchange through water. At the same time, the refrigerant is gas during radiation heat exchange, which reduces the flow resistance of the system and reduces energy consumption.

[0010] A preferred solution is that the heating equipment has a heating mode, a floor heating mode and a combined heating mode; in the heating mode, the first throttle valve is opened, and the second throttle valve and the switch valve are closed; in the floor heating mode, the second throttle valve is opened, and the first throttle valve and the switch valve are closed; in the combined heating mode, the first throttle valve, the second throttle valve and the switch valve are all opened.

[0011] It can be seen from this that the heating demand can be judged according to the indoor and outdoor ambient temperature, and then the appropriate heating mode can be selected to reduce heat loss, improve energy utilization, achieve energy saving, and improve human comfort.

[0012] A preferred solution is that a first temperature sensor is provided on the outlet side of the indoor heat exchanger, and the first temperature sensor is located between the indoor heat exchanger and the first position. Alternatively, a first temperature sensor is provided on the air outlet side of the indoor heat exchanger.

[0013] It can be seen that the first temperature sensor is used to detect the temperature of the refrigerant flowing out of the indoor heat exchanger, which indirectly reflects the heating temperature. The first temperature sensor can also be directly arranged on the air outlet side of the indoor heat exchanger to directly detect the heating temperature.

[0014] A preferred solution is that a second temperature sensor is provided on the outlet side of the floor heating heat exchanger, and the second temperature sensor is located between the floor heating heat exchanger and the second throttle valve.

[0015] It can be seen that the second temperature sensor is used to detect the temperature of the refrigerant flowing out of the floor heating heat exchanger.

[0016] A preferred solution is that at least one of the first throttle valve and the second throttle valve is an electronic expansion valve, and / or the switch valve is a solenoid valve or an electronic expansion valve.

[0017] It can be seen that the electronic expansion valve can realize the functions of switching and throttling at the same time. Both the solenoid valve and the electronic expansion valve can realize the functions of conduction and disconnection. When the electronic expansion valve does not need to throttle, it can be adjusted to the maximum opening.

[0018] A preferred solution is that along the flow direction of the refrigerant in the third pipeline, the one-way valve is located on the downstream side of the switch valve.

[0019] A further solution is that the one-way valve is arranged close to the first end of the third pipeline.

[0020] To achieve the above-mentioned second purpose, the present invention provides a control method for the above-mentioned heating equipment, including: after the heating equipment is turned on, first run the heating mode, open the first throttle valve, and close the second throttle valve and the switch valve; obtain the first temperature at the indoor heat exchanger, and determine whether the first temperature is greater than the first preset temperature; if so, enter the combined heating mode, the first throttle valve remains in an open state, and the second throttle valve and the switch valve are opened at the same time; determine whether the outdoor ambient temperature is greater than the first outer ring preset temperature; if the outdoor ambient temperature is greater than the first outer ring preset temperature, further determine whether the second temperature at the floor heating heat exchanger is greater than the second preset temperature; if the second temperature at the floor heating heat exchanger is greater than the second preset temperature, enter the floor heating mode, the second throttle valve remains in an open state, and the first throttle valve and the switch valve are closed at the same time.

[0021] It can be seen from the above scheme that since the floor heating heats up slowly when it is just turned on, the present invention realizes rapid heating by entering the heating mode when it is just turned on, so as to meet the consumer's demand for rapid heating. At the same time, the heating and floor heating are combined through adjusting the heating of multiple parameter intervals, and the indoor temperature is gradually reduced from bottom to top through the floor radiation heat exchange, so as to improve human comfort and maximize the use of energy. At the same time, through the coupling of the two heating modes of floor heating and heating, the requirements of rapid heating and uniform temperature distribution in the target area are met at the same time, so as to improve human comfort. In addition, when the heating and floor heating are turned on at the same time, the switch valve is adjusted to make part of the refrigerant flowing through the heating re-enter the floor heating for secondary heat exchange, so as to improve energy utilization and achieve the purpose of energy saving.

[0022] A preferred solution is that the control method also includes: if the outdoor ambient temperature is greater than the second outer ring preset temperature and less than or equal to the first outer ring preset temperature, further judging whether the following conditions are met: the indoor and outdoor temperature difference is less than or equal to the preset temperature difference value, and the second temperature at the floor heating heat exchanger is greater than the second preset temperature; if the above conditions are met, the floor heating mode is entered, the second throttle valve is maintained in the open state, and the first throttle valve and the switch valve are closed at the same time.

[0023] To achieve the above-mentioned third purpose, the present invention provides another control method for the above-mentioned heating equipment. After the heating equipment is turned on, the heating mode is first operated, the first throttle valve is opened, and the second throttle valve and the switch valve are closed; the first temperature at the indoor heat exchanger is obtained, and it is determined whether the first temperature is greater than the first preset temperature; if so, the combined heating mode is entered, the first throttle valve is maintained in an open state, and the second throttle valve and the switch valve are opened at the same time; it is determined whether the outdoor ambient temperature is less than or equal to the first outer ring preset temperature and greater than the second outer ring preset temperature; if the outdoor ambient temperature is greater than the second outer ring preset temperature and less than or equal to the first outer ring preset temperature, it is further determined whether the following conditions are met: the indoor and outdoor temperature difference is less than or equal to the preset temperature difference value, and the second temperature at the floor heating heat exchanger is greater than the second preset temperature; if the above conditions are met, the floor heating mode is entered, the second throttle valve is maintained in an open state, and the first throttle valve and the switch valve are closed at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a system block diagram of an embodiment of a heating device of the present invention.

[0025] Figure 2 It is a flow chart of the control method of the heating equipment embodiment of the present invention.

[0026] Figure 3 It is a schematic diagram of the flow direction of the refrigerant in the heating mode of the heating equipment embodiment of the present invention.

[0027] Figure 4 It is a schematic diagram of the flow direction of the refrigerant in the combined heating mode of the heating equipment embodiment of the present invention.

[0028] Figure 5 It is a schematic diagram of the flow direction of the refrigerant in the floor heating mode of the heating equipment embodiment of the present invention.

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0030] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present invention and its application or use. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete and to fully express the scope of the present invention to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, rather than as limitations.

[0031] The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0032] In the present invention, when a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediate device, or may not be directly connected to the other devices but have an intermediate device.

[0033] All terms (including technical terms or scientific terms) used in the present invention have the same meanings as those understood by ordinary technicians in the field, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0034] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0035] See also Figure 1 The heating equipment includes a compressor 1, an indoor heat exchanger 2, an outdoor heat exchanger 3, a first throttle valve 4, a floor heating heat exchanger 5, a second throttle valve 6, a first pipeline 71, a second pipeline 72, a third pipeline 73, a one-way valve 81, a switch valve 82, an indoor fan 91 and an outdoor fan 92.

[0036] The compressor 1, the indoor heat exchanger 2 and the outdoor heat exchanger 3 are connected in sequence to form a refrigerant circulation system, and the first throttle valve 4 is located between the indoor heat exchanger 2 and the outdoor heat exchanger 3. The indoor fan 91 is arranged close to the indoor heat exchanger 2, and the outdoor fan 92 is arranged close to the outdoor heat exchanger 3.

[0037] The first pipeline 71 and the second pipeline 72 are arranged in parallel, and the two ends of the first pipeline 71 are respectively connected to the outdoor heat exchanger 3 and the compressor 1, and the two ends of the second pipeline 72 are also respectively connected to the outdoor heat exchanger 3 and the compressor 1. The indoor heat exchanger 2 and the first throttle valve 4 are both arranged on the first pipeline 71, and the floor heating heat exchanger 5 and the second throttle valve 6 are both arranged on the second pipeline 72. Along the flow direction of the refrigerant, the second throttle valve 6 is located at the downstream side of the floor heating heat exchanger 5. The one-way valve 81 and the switch valve 82 are both arranged on the third pipeline 73. The first end 731 of the third pipeline 73 is connected to the inlet side of the floor heating heat exchanger 5, and the second end 732 of the third pipeline 73 is connected to the first position A of the first pipeline 71 and communicates with the first pipeline 71. The first position A is located between the indoor heat exchanger 2 and the first throttle valve 4. The one-way valve 81 is unidirectional from the second end 732 of the third pipeline 73 to the first end 731 of the third pipeline 73. Along the flow direction of the refrigerant in the third pipeline 73 , the one-way valve 81 is located on the downstream side of the switch valve 82 , and the one-way valve 81 is disposed close to the first end 731 of the third pipeline 73 .

[0038] A first temperature sensor 21 is provided at the outlet side of the indoor heat exchanger 2. The first temperature sensor 21 is located between the indoor heat exchanger 2 and the first position A. The first temperature sensor 21 is used to detect the temperature of the refrigerant flowing out of the indoor heat exchanger 2, and indirectly reflects the heating temperature. In other implementation examples, the first temperature sensor can also be provided at the outlet side of the indoor heat exchanger 2, so as to directly detect the outlet air temperature of the indoor unit.

[0039] A second temperature sensor 51 is provided on the outlet side of the floor heating heat exchanger 5 . The second temperature sensor 51 is located between the floor heating heat exchanger 5 and the second throttle valve 6 . The second temperature sensor 51 is used to detect the temperature of the refrigerant flowing out of the floor heating heat exchanger 5 .

[0040] The first throttle valve 4 and the second throttle valve 6 both adopt electronic expansion valves, or one of them may adopt an electronic expansion valve and the other may adopt other throttling devices, or both may adopt other throttling devices. The switch valve 82 is a solenoid valve, and the switch valve 82 may also adopt an electronic expansion valve.

[0041] The heating equipment has a heating mode, a floor heating mode and a combined heating mode; in the heating mode, the first throttle valve 4 is opened, and the second throttle valve 6 and the switch valve 82 are closed; in the floor heating mode, the second throttle valve 6 is opened, and the first throttle valve 4 and the switch valve 82 are closed; in the combined heating mode, the first throttle valve 4, the second throttle valve 6 and the switch valve 82 are all opened.

[0042] See also Figure 2 The control method of the heating equipment of this embodiment includes the following steps:

[0043] After the heating device is turned on, step S1 is first executed to run the heating mode, open the first throttle valve 4, and close the second throttle valve 6 and the switch valve 82. In the heating mode, the refrigerant in the system flows as follows: Figure 3 As shown, step S2 is performed after running for the first preset time period. Optionally, the first preset time period is 15 minutes.

[0044] Step S2 is to obtain a first temperature at the indoor heat exchanger 2 and determine whether the first temperature is greater than a first preset temperature. Optionally, the first preset temperature is 35° C. The first temperature is a detection value of the first temperature sensor 21 .

[0045] If the first temperature is less than or equal to the first preset temperature, step S21 is executed, and after continuing to run for a second preset time period in the heating mode, step S2 is re-executed. Optionally, the second preset time period is 5 minutes.

[0046] If the first temperature is greater than the first preset temperature, step S3 is executed to enter the combined heating mode, the first throttle valve 4 is kept open, and the second throttle valve 6 and the switch valve 82 are opened. In the combined heating mode, the refrigerant in the system flows to Figure 4 shown.

[0047] Next, step S4 is performed to determine whether the outdoor environment temperature is greater than a first outer ring preset temperature. Optionally, the first outer ring preset temperature is 5°C.

[0048] If the outdoor environment temperature is greater than the first outer ring preset temperature, step S5 is executed to further determine whether the second temperature at the floor heating heat exchanger 5 is greater than the second preset temperature. Optionally, the second preset temperature is 15° C. The second temperature is the detection value of the second temperature sensor 51.

[0049] If the second temperature at the floor heating heat exchanger 5 is greater than the second preset temperature, step S6 is executed to enter the floor heating mode, the second throttle valve 6 remains open, and the first throttle valve 4 and the switch valve 82 are closed. In the floor heating mode, the refrigerant in the system flows to Figure 5 shown.

[0050] If the second temperature at the floor heating heat exchanger 5 is less than or equal to the second preset temperature, execute step S7. After maintaining the combined heating mode for the fourth preset time period, return to step S5 to re-determine whether the second temperature at the floor heating heat exchanger 5 is greater than the second preset temperature.

[0051] If the outdoor ambient temperature is less than or equal to the first outer ring preset temperature, step S81 is executed to determine whether the outdoor ambient temperature is greater than the second outer ring preset temperature. Optionally, the second outer ring preset temperature is -5°C.

[0052] If the outdoor ambient temperature is less than or equal to the second outer ring preset temperature, step S9 is executed to maintain the combined heating mode.

[0053] If the outdoor ambient temperature is greater than the second outer ring preset temperature, step S82 is executed to further determine whether the indoor and outdoor temperature difference is less than or equal to a preset temperature difference value. Optionally, the preset temperature difference value is 15° C. The indoor and outdoor temperature difference is the difference between the indoor ambient temperature and the outdoor ambient temperature.

[0054] If the indoor and outdoor temperature difference is less than or equal to the preset temperature difference value, step S5 is executed.

[0055] If the indoor and outdoor temperature difference is greater than the preset temperature difference value, step S83 is executed. After maintaining the combined heating mode for the third preset time period, the process returns to step S82 to re-determine whether the indoor and outdoor temperature difference is less than or equal to the preset temperature difference value.

[0056] Since the floor heating heats up slowly when it is just turned on, the heating mode is entered to achieve rapid heating when it is just turned on to meet consumers' needs for rapid heating. At the same time, the heating and floor heating are combined through multiple parameter intervals, and the indoor temperature is gradually reduced from bottom to top through floor radiation heat exchange, which improves human comfort and maximizes energy utilization. At the same time, through the coupling of floor heating and heating, the requirements of rapid heating and uniform temperature distribution in the target area are met at the same time, improving human comfort. In addition, when the heating and floor heating are turned on at the same time, the switch valve is adjusted to allow part of the refrigerant flowing through the heating to re-enter the floor heating for secondary heat exchange, thereby improving energy utilization and achieving energy saving.

[0057] As can be seen from the above, the present invention sets the indoor heat exchanger and the floor heating heat exchanger in parallel, and the indoor heat exchanger and the floor heating heat exchanger can heat individually or together. When the refrigerant temperature at the heating outlet reaches the preset temperature value, the floor heating heat exchanger is turned on and the refrigerant coming out of the indoor heat exchanger is recovered. The refrigerant coming out of the indoor heat exchanger can realize secondary heat exchange in the floor heating heat exchanger, and the heating and floor heating are combined, and the two are combined for heating, that is, fast heating is achieved, human comfort is satisfied, and energy is maximized. In addition, since the refrigerant temperatures required for heating and floor heating are different, the present invention realizes independent control of the refrigerant temperatures of the two routes by controlling the first throttle valve, the second throttle valve and the switch valve to achieve the purpose of combined heating. The refrigerant temperature required for heating is higher than that for floor heating. By controlling part of the refrigerant passing through the heating flow path to re-enter the floor heating flow, the purpose of secondary heat exchange is achieved, energy is maximized, energy saving is achieved, and human comfort is improved. At the same time, in the heating equipment of the present invention, the heating and floor heating systems are crossed, and heat recovery can be performed once to improve energy utilization. In addition, compared with the existing floor heating method of heating water through heat exchange between refrigerant and water, the floor heating of the present invention directly uses refrigerant radiation heat exchange, avoiding energy loss caused by heat exchange with water and then radiation heat exchange through water. At the same time, the refrigerant is gas during radiation heat exchange, which reduces the flow resistance of the system and reduces energy consumption.

[0058] Finally, it should be emphasized that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Heating equipment, including a compressor, an indoor heat exchanger, an outdoor heat exchanger and a first throttle valve; The compressor, the indoor heat exchanger and the outdoor heat exchanger are connected in sequence to form a refrigerant circulation system, and the first throttle valve is located between the indoor heat exchanger and the outdoor heat exchanger; Features: The heating equipment also includes a floor heating heat exchanger, a second throttle valve, a first pipeline, a second pipeline, a third pipeline, a one-way valve and a switch valve; The first pipeline and the second pipeline are arranged in parallel, the two ends of the first pipeline are respectively connected to the outdoor heat exchanger and the compressor, and the two ends of the second pipeline are respectively connected to the outdoor heat exchanger and the compressor; The indoor heat exchanger and the first throttle valve are both arranged on the first pipeline, the floor heating heat exchanger and the second throttle valve are both arranged on the second pipeline, and along the flow direction of the refrigerant, the second throttle valve is located at the downstream side of the floor heating heat exchanger; The one-way valve and the switch valve are both arranged on the third pipeline. The first end of the third pipeline is connected to the inlet side of the floor heating heat exchanger. The second end of the third pipeline is connected to the first position of the first pipeline and communicates with the first pipeline. The first position is located between the indoor heat exchanger and the first throttle valve. The one-way valve is unidirectional from the second end of the third pipeline to the first end of the third pipeline.

2. The heating device according to claim 1, characterized in that: The heating equipment has a heating mode, a floor heating mode and a combined heating mode; In the heating mode, the first throttle valve is opened, and the second throttle valve and the switch valve are closed; In the floor heating mode, the second throttle valve is opened, and the first throttle valve and the switch valve are closed; In the combined heating mode, the first throttle valve, the second throttle valve and the switch valve are all opened.

3. The heating device according to claim 1, characterized in that: A first temperature sensor is disposed at the outlet side of the indoor heat exchanger, and the first temperature sensor is located between the indoor heat exchanger and the first position; or A first temperature sensor is disposed on the air outlet side of the indoor heat exchanger.

4. The heating device according to claim 1, characterized in that: A second temperature sensor is disposed on the outlet side of the floor heating heat exchanger, and the second temperature sensor is located between the floor heating heat exchanger and the second throttle valve.

5. The heating device according to any one of claims 1 to 4, characterized in that: At least one of the first throttle valve and the second throttle valve is an electronic expansion valve; and / or The switch valve is a solenoid valve or an electronic expansion valve.

6. The heating device according to any one of claims 1 to 4, characterized in that: Along the flow direction of the refrigerant in the third pipeline, the one-way valve is located on the downstream side of the switch valve.

7. The heating device according to claim 6, characterized in that: The one-way valve is disposed close to the first end of the third pipeline.

8. A method for controlling a heating device, characterized in that: Applied to the heating device according to any one of claims 1 to 7, the control method comprises: After the heating device is turned on, the heating mode is first operated, the first throttle valve is opened, and the second throttle valve and the switch valve are closed; Acquiring a first temperature at the indoor heat exchanger, and determining whether the first temperature is greater than a first preset temperature; If yes, the combined heating mode is entered, the first throttle valve is kept open, and the second throttle valve and the switch valve are opened at the same time; Determine whether the outdoor ambient temperature is greater than the first outer ring preset temperature; If the outdoor environment temperature is greater than the first outer ring preset temperature, further determining whether the second temperature at the floor heating heat exchanger is greater than the second preset temperature; If the second temperature at the floor heating heat exchanger is greater than the second preset temperature, the floor heating mode is entered, the second throttle valve is maintained in an open state, and the first throttle valve and the switch valve are closed.

9. The control method of the heating equipment according to claim 8, characterized in that: The control method further comprises: If the outdoor ambient temperature is greater than the second outer ring preset temperature and less than or equal to the first outer ring preset temperature, further determine whether the following conditions are met: the indoor and outdoor temperature difference is less than or equal to the preset temperature difference value, and the second temperature at the floor heating heat exchanger is greater than the second preset temperature; If the above conditions are met, the floor heating mode is entered, the second throttle valve is maintained in an open state, and the first throttle valve and the switch valve are closed.

10. A method for controlling a heating device, characterized in that: Applied to the heating device according to any one of claims 1 to 7, the control method comprises: After the heating device is turned on, the heating mode is first operated, the first throttle valve is opened, and the second throttle valve and the switch valve are closed; Acquiring a first temperature at the indoor heat exchanger, and determining whether the first temperature is greater than a first preset temperature; If yes, the combined heating mode is entered, the first throttle valve is kept open, and the second throttle valve and the switch valve are opened at the same time; Determine whether the outdoor ambient temperature is less than or equal to the first outer ring preset temperature and greater than the second outer ring preset temperature; If the outdoor ambient temperature is greater than the second outer ring preset temperature and less than or equal to the first outer ring preset temperature, further determine whether the following conditions are met: the indoor and outdoor temperature difference is less than or equal to the preset temperature difference value, and the second temperature at the floor heating heat exchanger is greater than the second preset temperature; If the above conditions are met, the floor heating mode is entered, the second throttle valve is maintained in an open state, and the first throttle valve and the switch valve are closed at the same time.

Images