Combined heat exchange system
By adding a second heat exchanger to the existing air conditioning system and achieving coordinated control with the air conditioning system, the problem of the air conditioning system sharing an outdoor unit with the second heat exchanger in the building is solved, and the heating efficiency and user experience are improved.
Patent Information
- Application Number
- CN202421942769.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-12
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-08-12
AI Technical Summary
In the prior art, it is difficult for the air conditioning system to share the outdoor unit with the second heat exchanger in the building, and it is impossible to achieve coordinated control, resulting in low heating efficiency, high noise and uncomfortable somatosensitivity.
A combined heat exchange system is designed, by adding a second heat exchanger to the existing air conditioning system, and using a valve assembly to realize a shared air conditioning outdoor unit with an air conditioning indoor unit, while simultaneously realizing the coordinated control of the second heat exchanger and the air conditioning system.
The function of adding a second heat exchanger to the existing air conditioning system is realized, which improves heating efficiency, reduces noise, enhances user experience, and does not require much cost.
Smart Images
Figure CN223020392U_ABST
Abstract
Description
Technical Field
[0001] This application relates to a combined heat exchange system. Background Art
[0002] As an air conditioning device, an air conditioner uses the evaporation and condensation of a heat exchange medium to achieve the effects of refrigeration and heating indoors respectively. However, using an air conditioner for heating has technical defects such as low heating efficiency, high noise, and uncomfortable body sensation. Therefore, many users choose to use a second heat exchanger buried in the building surface layer to achieve heating. For example, floor heating is the most common heating form. Burying the second heat exchanger in the building surface layer not only has no noise, but also can increase the heat exchange area compared with an air conditioner, making the heat exchange efficiency higher. In the prior art, it is usually necessary to set up two separate systems to control the air conditioner and the second heat exchanger in the building respectively. Moreover, two outdoor units need to be set up, which are used for the air conditioner and the second heat exchanger in the building respectively. However, in existing buildings such as ordinary residential buildings, it is simply impossible to reserve installation positions for two outdoor units in each room. More importantly, in the huge air conditioner stock market, if you want to add a second heat exchanger in the building, you can only set it up separately from the air conditioner system, and it is impossible to share the outdoor unit, let alone achieve the coordinated control of the air conditioner and the second heat exchanger.
[0003] Therefore, in the prior art, there is a need for a device that can add a second heat exchanger disposed in a building to an existing air conditioner system including an outdoor unit and an indoor unit, set the second heat exchanger and the air conditioner indoor unit to share the air conditioner outdoor unit, and at the same time can achieve the coordinated control of the second heat exchanger and the air conditioner indoor unit. Summary of the Utility Model
[0004] The purpose of this application is to design a combined heat exchange system, which can add a second heat exchanger indoors on the basis of an existing air conditioner indoor unit to share the air conditioner outdoor unit with the air conditioner indoor unit and can achieve coordinated control with the air conditioner system, so as to improve and upgrade the air conditioner stock market without adding too much cost, improve the user experience, and achieve the compatibility of the air conditioner system and the second heat exchange system.
[0005] A combined heat exchange system according to this application includes an outdoor unit and an indoor unit. The outdoor unit is provided with an outdoor heat exchanger, the indoor unit is provided with an indoor heat exchanger, and it further includes a second heat exchanger disposed indoors. The second heat exchanger and the indoor heat exchanger are connected in parallel to the outdoor heat exchanger through a valve assembly, and the valve assembly controls one of the second heat exchanger and the indoor heat exchanger to be connected to the outdoor heat exchanger.
[0006] Among them, the valve assembly may include a first control valve connected to the indoor heat exchanger and a second control valve connected to the second heat exchanger, and one of the first control valve and the second control valve is opened; the combined heat exchange system may also be provided with an indoor unit ambient temperature sensor for sensing the ambient temperature of the indoor unit location and an indoor unit medium temperature sensor for sensing the temperature of the heat exchange medium in the indoor heat exchanger; the valve assembly may also be provided with a valve assembly ambient temperature sensor for sensing the indoor ambient temperature at the valve assembly location and a valve assembly medium temperature sensor for sensing the temperature of the heat exchange medium entering and leaving the valve assembly; the indoor unit may also be provided with a Hall element and an indoor control board, and an external board circuit is connected between the Hall element and the indoor control board; it may also include a fan operation management module, and the fan operation management module includes a fan power control module and a square wave generator. The fan power control module may be respectively connected to a Hall sensor and a fan power interface, and the square wave generator may be respectively connected to an indoor fan and a Hall element receiver; it may also include a temperature sensing management module, and the temperature sensing management module is connected to the indoor unit ambient temperature sensor, the indoor unit medium temperature sensor, the valve assembly ambient temperature sensor, and the valve assembly medium temperature sensor; it may also include a power management module and a valve switching management module. The power management module is connected to a power supply, and the valve switching management module is connected to the valve assembly; the second heat exchanger may be a floor heating heat exchanger; the plug connector of the external board circuit may be plugged into the indoor control board. BRIEF DESCRIPTION OF THE DRAWINGS
[0007] Figure 1 FIG. is a schematic diagram of the combined heat exchange system of the present application in a refrigeration state.
[0008] Figure 2 FIG. is a schematic diagram of the combined heat exchange system of the present application in a heating state.
[0009] Figure 3 FIG. is a schematic diagram of the control logic of the combined heat exchange system of the present application.
[0010] Figure 4 FIG. is a schematic diagram of the control logic in the heating mode.
[0011] Figure 5 FIG. is a schematic diagram of the control logic in the refrigeration mode. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0012] To make the objectives, technical solutions, and advantages of the present application clearer and more understandable, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined arbitrarily with each other.
[0013] A combined heat exchange system according to the present application can achieve blowing and cooling by an air conditioner indoor unit during summer cooling, and heating during winter heating through a second heat exchanger in a building. In the present application, the indoor heat exchanger of the air conditioner and the second heat exchanger in the building are arranged in parallel. When cooling in summer, the heat exchange medium only flows in the indoor heat exchanger of the air conditioner and does not flow in the second heat exchanger, and forced convection is achieved through an indoor fan; when heating in winter, the heat exchange medium does not flow in the indoor heat exchanger but only flows in the second heat exchanger. At the same time, in order to further reduce wind noise, the indoor fan needs to stop operating. The second heat exchanger of the present application is preferably a floor heating heat exchanger buried in the floor concrete layer, that is, the preferred application scenario of the present application is the coordinated control of an air conditioner and a floor heating system. However, it should be noted that the second heat exchanger of the present application can also be arranged in a wall or hung on a wall, or an independent heat exchanger independently arranged indoors and other possible forms.
[0014] The control system of the present application can also be applied to newly installed air conditioning systems, not limited to the existing market. For newly installed systems, the entire system can be supported during production. However, for existing users who have already installed air conditioners, if they want to achieve the coordinated control of the second heat exchanger and the air conditioner, they must provide a valve assembly for controlling the flow direction of the heat exchange medium, and the indoor unit fan needs to be turned off during heating, which are two key technical problems.
[0015] As Figure 1-2 shown, which shows a schematic diagram of a combined heat exchange system according to the present application. As shown in the figure, the combined heat exchange system includes an outdoor unit 1 and an indoor unit 2. The outdoor unit 1 is provided with an outdoor heat exchanger 13, and the indoor unit 2 is provided with an indoor heat exchanger 21. In addition, the outdoor unit 1 is further provided with a compressor 11, an outdoor control board 16 and an outdoor fan 14, the indoor unit 2 is further provided with an indoor fan 22 and an indoor control board 23, and the air conditioning system is further provided with a throttle valve 15 and a through valve assembly, such as the four-way valve 12 shown in the figure. In addition, the combined heat exchange system of the present application can also be provided with an indoor unit ambient temperature sensor 24 for sensing the ambient temperature of the indoor unit position and an indoor unit medium temperature sensor 25 for sensing the temperature of the heat exchange medium in the indoor heat exchanger. The indoor unit medium temperature sensor 25 can be arranged on the pipeline of the indoor heat exchanger. The above are all conventional technologies of existing air conditioners.
[0016] The combined heat exchange system of the present application further includes a second heat exchanger 3 disposed indoors. A valve assembly 4 is provided on the heat exchange pipeline between the outdoor unit 1 and the indoor unit 2. The indoor heat exchanger 21 and the second heat exchanger 3 are connected in parallel to the valve assembly 4. During refrigeration, the heat exchange medium only circulates and exchanges heat between the indoor heat exchanger 21 and the outdoor heat exchanger 13. During heating, the heat exchange medium only circulates between the second heat exchanger 3 and the outdoor heat exchanger 13. The valve assembly 4 respectively includes a first control valve 41 connected to the heat exchange pipeline of the indoor unit and a second control valve 42 connected to the second heat exchanger. Both the first control valve 41 and the second control valve 42 can be solenoid valves, and the first control valve 41 and the second control valve 42 can be controlled by a valve assembly control board 43.
[0017] During refrigeration, the heat exchange medium flows through the three-way on the pipeline and enters the indoor unit through the first control valve. During heating, the first control valve switches to the closed state while the second control valve switches to the open state, and the heat exchange medium flows through the three-way on the pipeline and enters the second heat exchanger through the second control valve. In addition, the valve assembly 4 is also provided with a valve assembly ambient temperature sensor 44 for sensing the indoor ambient temperature at the position of the valve assembly and a valve assembly medium temperature sensor 45 for sensing the temperature of the heat exchange medium entering and leaving the valve assembly. The valve assembly medium temperature sensor 45 can be arranged on the heat exchange pipeline at the valve assembly.
[0018] Before the air conditioner is turned on, all states are the inherent states of the air conditioner and do not need to be changed. When the air conditioner is set to the refrigeration mode through the remote control or the wired controller, all logical controls are carried out according to the existing control mode of the air conditioner. At this time, the temperature values measured by the indoor unit medium temperature sensor 25 and the valve assembly ambient temperature sensor 44 in the valve assembly are compared. If the former is less than the latter, it is sensed that the air conditioner enters the refrigeration mode, and the control valve does not perform any action. When the air conditioner is set to the heating mode through the remote control or the wired controller, all logical controls are carried out according to the existing control mode of the air conditioner; the temperature values measured by the indoor unit medium temperature sensor 25 and the valve assembly ambient temperature sensor 44 in the valve assembly are compared. If the former is greater than the latter, it is sensed that the air conditioner enters the heating mode, and the first control valve and the second control valve perform switching actions. For the heating mode of the existing air conditioner indoor unit, a program is set to start the fan on the indoor unit only when the indoor unit medium temperature sensor 25 reaches a certain temperature, so as to avoid the discomfort caused by directly blowing cold air when the heat exchange medium in the indoor unit heat exchanger is not yet hot. Therefore, the first control valve and the second control valve need to be switched before the fan starts. If the temperature of the valve assembly medium temperature sensor 45 exceeds the return liquid temperature limit value, for example, it can be preset to 40°C, the variable frequency machine should operate at a reduced frequency, and the fixed frequency machine should stop and start.
[0019] In Figure 1In the refrigeration mode shown, the second control valve 42 connected to the second heat exchanger 3 is in the closed state, and the first control valve 41 connected to the indoor heat exchanger 21 is in the open state. At this time, only the indoor unit of the air conditioner is used for refrigeration, and the circulation mode of the heat exchange medium is the same as that of the existing air conditioner system, which will not be elaborated here. In Figure 2 In the heating mode shown, the second control valve 42 connected to the second heat exchanger 3 is in the open state, and the first control valve 41 connected to the indoor heat exchanger 21 is in the closed state. At this time, the outdoor heat exchanger and the second heat exchanger 3 are in the opposite cycle heat exchange state, and its heating principle is the same as that of the existing air conditioner system.
[0020] In the heating mode, two problems may occur: First, since the heat exchange medium does not flow through the indoor unit heat exchanger, the medium temperature sensor installed in the indoor unit may have an abnormal fault alarm, resulting in the shutdown of the air conditioner; Second, the fan installed on the indoor unit continues to operate, blowing uncomfortable cold air.
[0021] First, regarding how to solve the problem of false alarm of the indoor unit medium temperature sensor due to temperature loss of the air conditioner. The valve assembly of the present application is provided with a valve assembly medium temperature sensor and a valve assembly ambient temperature sensor. An indoor unit ambient temperature sensor for sensing the indoor ambient temperature and an indoor unit medium temperature sensor for sensing the medium temperature in the indoor unit heat exchanger are provided on the indoor unit. In the refrigeration mode, the values of the indoor unit ambient temperature sensor and the indoor unit medium temperature sensor are selected for temperature control. In the heating mode, the value of the valve assembly medium temperature sensor is used to replace the value of the indoor unit medium temperature sensor, and the value of the valve assembly ambient temperature sensor is used to replace the value of the indoor unit ambient temperature sensor. The existing control logic of the air conditioner remains unchanged. At this time, the selected valve assembly temperature sensor is preferably the same type of temperature sensor as the temperature sensor of the air conditioner.
[0022] Secondly, regarding how to turn off the blower of the indoor unit during heating. The power supply of the blower of the air conditioner indoor unit is made into a controlled state, that is, the power supply and disconnection are realized by using an external circuit board. Hall elements are usually provided in existing air conditioner indoor units, and the Hall elements are connected to the indoor unit control board. The specific implementation of this application is to connect a square wave circuit in parallel at the output signal terminal of the Hall element. The square wave circuit and the Hall element are connected and disconnected through an external circuit board. The external circuit board of this application can be miniaturized and modularized, so that when transforming the existing stock air conditioner market, it only needs to cut off the connection line between the Hall element and the control board of the existing air conditioner indoor unit, and connect the external circuit board of this application at the break point, making the transformation of the stock air conditioner market simple and feasible without major modifications. This application can achieve: when the air conditioner is in the cooling mode, the blower power supply is provided, the blower operates normally, the Hall element is in a conducting state, and signals are normally collected and controlled, while the square wave circuit is disconnected. When the air conditioner is in the heating mode, the blower power supply is disconnected, the blower does not operate; the Hall element is disconnected; the square wave circuit is in a conducting state, and outputs a signal to the Hall signal acquisition module. The specific control method and logic are described as follows.
[0023] As Figure 3 shown, which shows the control logic schematic diagram of the combined heat exchange system of this application. The indoor unit is controlled by the indoor control board 23, and the outdoor unit is controlled by the valve assembly control board 43. The indoor blower 22, the indoor unit ambient temperature sensor 24, the indoor unit medium temperature sensor 25, and the Hall sensor 26 are all connected to the indoor control board 23. In addition, the indoor unit may also be provided with a blower power supply interface 27 and a Hall element receiver 28. The blower power supply interface 27 is used to supply power to the blower, and the Hall element receiver 28 is used to receive the data information of the Hall sensor 26. The control module 43 of this application includes a power management module 431, a valve switching management module 432, a temperature sensing management module 433, and a blower operation management module 434. The power management module 431 is connected to an external power supply, the valve switching management module 432 is connected to the valve assembly 4, the temperature sensing management module 433 is connected to the indoor unit ambient temperature sensor 24, the indoor unit medium temperature sensor 25, the valve assembly ambient temperature sensor 44, and the valve assembly medium temperature sensor 45. The blower operation management module 434 includes a blower power control module 4341 and a square wave generator 4342. The blower power control module 4341 is respectively connected to the Hall sensor 26 and the blower power supply interface 27, and the square wave generator 4342 is respectively connected to the indoor blower 22 and the Hall element receiver 28.
[0024] The control module 43 continuously senses the temperature T25 of the indoor unit medium temperature sensor 25 and compares it with the temperature T24 sensed by the indoor unit environment temperature sensor 24. When the outdoor unit is started for a time interval t1, T25<T24 and the difference between the two meets a certain threshold, the control module 43 determines that the air conditioning unit enters the indoor cooling mode, and the solenoid valve in the valve assembly 4 and all electrical control components in the control module 43 do not operate. When the outdoor unit 1 is started for a time interval t1, T25>T24 and the difference between the two meets a certain threshold, the control module 43 determines that the air conditioning unit enters the heating mode.
[0025] After entering the heating mode, the control is performed according to the following logic: the control module 43 outputs a signal to close the first control valve 41 and open the second control valve 42; at this time, the circulation pipeline of the refrigerant to the indoor unit 2 is blocked, so that it flows to the pipeline of the second heat exchanger 3 that is connected to the circulation pipeline. When the air conditioner enters the heating mode, the outdoor unit 1 is first started to allow the refrigerant to circulate in the outdoor unit 1 and the indoor unit 2 for a certain time interval t2, and at this time, when the temperature T25 sensed by the medium temperature sensor 25 of the indoor unit does not reach the start threshold of the indoor fan 22, the indoor fan 22 will not run. This setting is mainly to prevent the cold wind from blowing on people and causing discomfort to the human body. When the temperature T25 sensed by the medium temperature sensor 25 of the indoor unit reaches the start threshold of the indoor fan 22, the fan 22 runs. During the operation of the outdoor unit for t2 time, T25 needs to meet a certain temperature threshold, otherwise it is determined to be a unit failure.
[0026] like Figure 4As shown, in the heating mode, the temperature sensing management module 433 switches the temperature sensors 24, 25, 44, and 45. That is, switches 4333 and 4334 disconnect the temperature values transmitted by the temperature sensors 24 and 25, while switches 4331 and 4332 close to import the temperature values of the temperature sensors 44 and 45. The indoor control board 23 receives the temperature values from the temperature sensors 44 and 45, rather than the temperature values of the temperature sensors 24 and 25. The time point of this switch is t3, and it must satisfy t1 < t3 < t2. The fan power control module 4341 in the fan operation management module 434 opens the power circuit, and the fan stops running. At this time, the fan continues to rotate due to inertia, and the Hall signal on the fan is transmitted to the indoor control board 23, determining that the fan is running normally. At the same time, the fan operation management module 434 opens the Hall signal transmitted by the fan and starts the square wave generator 4342 to simulate the Hall signal of the fan operation and transmit it to the Hall signal receiver 28 on the control board, so that the indoor control board 23 thinks the fan is running normally. After that, in this heating mode, the entire system still operates according to the existing air conditioner settings. When the entire air conditioner unit receives a shutdown signal, the control module 43 can obtain a signal from the fan power circuit to determine that the air conditioner unit enters the shutdown state. The temperature sensing management module switches the temperature sensors to import the temperature values of the indoor unit ambient temperature sensor and the indoor unit medium temperature sensor, and all valves and electrical components return to the state of refrigeration operation. Figure 5 Shows the control logic in the cooling mode, and the switching control of its switches is exactly opposite to Figure 4 that in the heating mode. In Figure 4-5 , the plug connector 46 of the external circuit board can be plugged into the control board of the existing air conditioner indoor unit, and the other end of the external circuit board can be connected to the Hall element of the existing air conditioner indoor unit.
[0027] Although the embodiments disclosed in the present application are as above, the content described above is only an embodiment adopted for the convenience of understanding the present application and is not used to limit the present application. Any person skilled in the art within the technical field to which the present application pertains can make any modifications and changes in the form of implementation and details without departing from the spirit and scope disclosed in the present application. However, the patent protection scope of the present application shall still be subject to the scope defined by the appended claims.
Claims
1. A combined heat exchange system, comprising an outdoor unit and an indoor unit, wherein the outdoor unit is provided with an outdoor heat exchanger, and the indoor unit is provided with an indoor heat exchanger, characterized in that: It also includes a second heat exchanger arranged indoors, wherein the second heat exchanger and the indoor heat exchanger are connected in parallel to the outdoor heat exchanger through a valve assembly, and the valve assembly controls one of the second heat exchanger and the indoor heat exchanger to be connected to the outdoor heat exchanger.
2. The combined heat exchange system according to claim 1, characterized in that: The valve assembly includes a first control valve connected to the indoor heat exchanger and a second control valve connected to the second heat exchanger, and one of the first control valve and the second control valve is opened.
3. The combined heat exchange system according to claim 1 or 2, characterized in that: The combined heat exchange system is also provided with an indoor unit environment temperature sensor for sensing the environment temperature at the indoor unit location and an indoor unit medium temperature sensor for sensing the temperature of the heat exchange medium in the indoor heat exchanger.
4. The combined heat exchange system according to claim 3, characterized in that: The valve assembly is also provided with a valve assembly environment temperature sensor for sensing the indoor environment temperature at the position of the valve assembly and a valve assembly medium temperature sensor for sensing the temperature of the heat exchange medium entering and exiting the valve assembly.
5. The combined heat exchange system according to claim 1, 2 or 4, characterized in that: The indoor unit is also provided with a Hall element and an indoor control board, and an external board circuit is connected between the Hall element and the indoor control board.
6. The combined heat exchange system according to claim 1, 2 or 4, characterized in that: It also includes a fan operation management module, which includes a fan power control module and a square wave generator. The fan power control module is respectively connected to the Hall sensor and the fan power interface, and the square wave generator is respectively connected to the indoor fan and the Hall element receiver.
7. The combined heat exchange system according to claim 4, characterized in that: It also includes a temperature sensing management module, which is connected to the indoor unit environment temperature sensor, the indoor unit medium temperature sensor, the valve assembly environment temperature sensor and the valve assembly medium temperature sensor.
8. The combined heat exchange system according to claim 1, 2 or 4, characterized in that: It also includes a power management module and a valve switching management module, wherein the power management module is connected to the power supply, and the valve switching management module is connected to the valve assembly.
9. The combined heat exchange system according to claim 1 or 2 or 4 or 7, characterized in that: The second heat exchanger is a floor heating heat exchanger.
10. The combined heat exchange system according to claim 5, characterized in that: The plug connector of the external board circuit is plugged into the indoor control board.