Total heat exchange fresh air unit, fresh air system and defrosting method

Abstract

The present invention provides a total heat exchange fresh air blower, a fresh air system and a defrosting method, which relate to the technical field of fresh air systems and solve the technical problems existing in the prior art that the indoor return air is used to defrost the total heat exchange core, the defrosting effect of the core is limited by the indoor air temperature, and the defrosting time is long. The total heat exchange fresh air blower includes a heating device and a switching structure. Among them, a fresh air channel and an exhaust air channel are arranged in the total heat exchange fresh air blower. When the switching structure is in an open state, the fresh air channel and the exhaust air channel can be connected to form a closed air duct, and the heating device is arranged on the closed air duct. The total heat exchange fresh air blower provided by the present invention can achieve rapid defrosting and avoid the problems in the prior art that the defrosting effect of the core is limited by the indoor air temperature and the defrosting time is long.

Description

Technical Field

[0001] The present invention relates to the technical field of fresh air systems, and in particular to a total heat exchange fresh air fan, a fresh air system and a defrosting method. Background Art

[0002] Existing total heat exchange fresh air fans use a total heat exchange core to achieve heat exchange between fresh air and exhaust air in order to recover the heat of the exhaust air. When used in cold winters in the north and other places, due to the large temperature and humidity difference between indoors and outdoors, condensation will occur in the heat exchange channels of the core. Coupled with the low outdoor temperature, frosting even occurs. After the core channels are condensed and frosted, the structural resistance of the core is increased, the fresh air volume or exhaust air volume becomes smaller, and the air volume is too low, seriously affecting the user experience. In addition, the condensation or frosting of the core channels will greatly reduce the heat exchange capacity of the unit, resulting in large energy consumption losses during the operation of the unit.

[0003] The conventional method for the core to solve condensation or frosting is to stop operating the heat exchange mode and use indoor air to dry the core. After the core is dried, the heat exchange mode is resumed. Generally, when reaching a certain low temperature condition, the unit intermittently operates the core defrosting mode. At this time, the unit operates intermittently, and the core defrosting effect is limited by the indoor air temperature, and the defrosting time is long. In addition, using the exhaust air to dry the core results in very large energy consumption losses. Summary of the Invention

[0004] The purpose of the present invention is to provide a total heat exchange fresh air fan, a fresh air system and a defrosting method, which solve the technical problem in the prior art that when using indoor return air to defrost the total heat exchange core, the core defrosting effect is limited by the indoor air temperature and the defrosting time is long. The many technical effects that can be produced by the preferred technical solutions provided by the present invention are described in detail below.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A total heat exchange fresh air fan provided by the present invention includes a heating device and a switching structure. Among them, a fresh air channel and an exhaust air channel are provided in the total heat exchange fresh air fan. When the switching structure is in the open state, it can connect the fresh air channel and the exhaust air channel to form a closed air duct, and the heating device is arranged on the closed air duct.

[0007] Furthermore, the total heat exchange fresh air fan further includes a total heat exchange core, and the heating device is installed on the total heat exchange core.

[0008] Furthermore, the heating device is plugged into the total heat exchange core.

[0009] Furthermore, the heating device is an electric heating device.

[0010] Further, the total heat exchange fresh air unit includes an exhaust air fan and a fresh air fan. The exhaust air fan and the fresh air fan are arranged on both sides of the total heat exchange core body. A fresh air lower air duct is arranged below the exhaust air fan, and an exhaust air lower air duct is arranged below the fresh air fan. When the on-off structure is in the open state, the air outlet side of the exhaust air fan is communicated with the fresh air lower air duct, and the air outlet side of the fresh air fan is communicated with the exhaust air lower air duct.

[0011] Further, the on-off structure includes two on-off components, and the air outlet side of the exhaust air fan and the air outlet side of the fresh air fan respectively correspond to one of the on-off components.

[0012] Further, the on-off component is a wind valve structure.

[0013] Further, a temperature and humidity sensor is arranged on the total heat exchange core body of the total heat exchange fresh air unit. The temperature and humidity sensor is arranged on the fresh air channel of the total heat exchange core body, and the temperature and humidity sensor is connected to the control device of the fresh air system.

[0014] Further, a pressure sensor is arranged on the total heat exchange core body of the total heat exchange fresh air unit. The pressure sensor is arranged on the exhaust air channel of the total heat exchange core body, and the pressure sensor is connected to the control device of the fresh air system.

[0015] The present invention provides a fresh air system, including the total heat exchange fresh air unit described above.

[0016] The present invention provides a defrosting method for the total heat exchange fresh air unit described above, including the following steps: determining whether the total heat exchange fresh air unit meets the defrosting condition; if it meets, controlling the four air inlets and outlets of the total heat exchange fresh air unit to be closed, opening the on-off structure and starting the heating device, and defrosting the total heat exchange core body by the flow of air in the closed air duct.

[0017] Further, it also includes: when the total heat exchange core body is defrosting, detecting the degree of defrosting of the total heat exchange core body; judging whether the condition for reducing the power of the heating device is met according to the degree of defrosting; if it meets, controlling the power of the heating device to be reduced.

[0018] Further, it includes: detecting the temperature, humidity and / or air pressure of the total heat exchange fresh air unit; judging the frosting condition of the total heat exchange fresh air unit by judging the temperature, humidity value and / or air pressure value.

[0019] The present invention can achieve the following technical effects: The present invention provides a total heat exchange fresh air machine. When defrosting the total heat exchange core body is required, the four air inlets (fresh air inlet, fresh air outlet, exhaust air inlet, and exhaust air outlet) of the total heat exchange fresh air machine are closed, and then the on-off structure is opened to form a closed air duct inside the total heat exchange fresh air machine. Then, the heating device, the fresh air fan, and the exhaust air fan inside the total heat exchange fresh air machine are started. Under the action of the fresh air fan and the exhaust air fan, the air flow circulates in the closed air duct, and the heating device heats the flowing air flow to defrost the total heat exchange core body. The total heat exchange fresh air machine provided by the present invention can achieve rapid defrosting, avoiding the problems in the prior art that the defrosting effect of the core body is limited by the indoor air temperature and the defrosting time is long. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 is a schematic structural diagram of the total heat exchange fresh air machine provided by the embodiment of the present invention;

[0022] Figure 2 is a schematic control principle diagram inside the total heat exchange fresh air machine provided by the embodiment of the present invention.

[0023] In the figure, 1 - fresh air inlet; 2 - fresh air outlet; 3 - exhaust air inlet; 4 - exhaust air outlet; 5 - fresh air fan; 6 - exhaust air fan; 7 - temperature and humidity sensor; 8 - pressure sensor; 9 - electric heating grid; 10 - total heat exchange core body; 11 - exhaust side air valve; 12 - fresh air side air valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other implementation manners obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0025] For a conventional total heat exchange core, the method to solve condensation or frosting is to use the indoor return air to dry the core. The defrosting effect of the core is limited by the indoor air state, and the defrosting time is long. Based on this, the present invention provides a total heat exchange fresh air unit with the following structure: It includes a heating device 9 and a switching structure. Among them, a fresh air channel and an exhaust air channel are arranged in the total heat exchange fresh air unit. When the switching structure is in the open state, it can connect the fresh air channel and the exhaust air channel to form a closed air duct, and the heating device 9 is arranged on the closed air duct. That is, when defrosting of the total heat exchange core is required, close the four air outlets of the total heat exchange fresh air unit (close the air valves at the four air outlets of the fresh air inlet 1, fresh air outlet 2, exhaust air inlet 3, and exhaust air outlet 4), then open the switching structure to form a closed air duct in the total heat exchange fresh air unit, and then start the heating device 9, the fresh air fan 5 and the exhaust air fan 6 in the total heat exchange fresh air unit. Under the action of the fresh air fan 5 and the exhaust air fan 6, the air flow circulates in the closed air duct, and the heating device 9 heats the flowing air to defrost the total heat exchange core 10. Or, after closing the four air outlets of the total heat exchange fresh air unit, first start the heating device 9. The heating device 9 heats the air in the total heat exchange fresh air unit. After the heating device 9 is started for a period of time, then start the fresh air fan 5 and the exhaust air fan 6. The total heat exchange fresh air unit provided by the present invention can achieve rapid defrosting, avoiding the problems that the defrosting effect of the core in the prior art is limited by the indoor air temperature and the defrosting time is long.

[0026] Regarding the installation position of the heating device in the total heat exchange fresh air unit, it is preferably to install the heating device 9 on the total heat exchange core 10 of the total heat exchange fresh air unit. See Figure 1 , which shows the position of the heating device 9 on the total heat exchange core 10, that is, the heating device 9 can be arranged on the outer side surface of the total heat exchange core 10. Preferably, the heating device 9 is arranged on the fresh air inlet side of the total heat exchange core 10, that is Figure 1 the position side at the lower left corner of the total heat exchange core 10 in

[0027] Regarding the specific connection structure between the heating device 9 and the total heat exchange core 10, it is preferably that the heating device 9 is plugged into the total heat exchange core 10. The plug-in connection method is simple and convenient for the installation and disassembly of the heating device 9. Regarding the specific structure of the plug-in, the existing technology can be adopted and will not be elaborated here. In addition, regarding the specific connection structure between the heating device 9 and the total heat exchange core 10, it is not limited to only the plug-in connection.

[0028] Regarding the heating device 9, the heating device 9 is an electric heating device, preferably an electric heating net. Using an electric heating net can fit the outer side surface of the total heat exchange core 10, and the area occupied by the total heat exchange fresh air unit is relatively small.

[0029] Regarding the total heat exchange fresh air unit, the total heat exchange fresh air unit includes an exhaust fan 6 and a fresh air fan 5. The exhaust fan 6 and the fresh air fan 5 are arranged on both sides of the total heat exchange core 10. A fresh air lower air duct is arranged below the exhaust fan 6, and an exhaust lower air duct is arranged below the fresh air fan 5. When the on-off structure is in the open state, the air outlet side of the exhaust fan 6 is connected to the fresh air lower air duct, and the air outlet side of the fresh air fan 5 is connected to the exhaust lower air duct.

[0030] Regarding the flow of air in the total heat exchange fresh air unit, refer to Figure 1 . When the total heat exchange fresh air unit is working normally, fresh air enters from the fresh air inlet 1 and enters the fresh air lower air duct below the exhaust fan 6, and then flows through the total heat exchange core 10 (from the lower left side to the upper right side of the total heat exchange core 10) to the fresh air fan 5, and then is discharged from the fresh air outlet 2. The passage for fresh air to flow in the total heat exchange fresh air unit is the fresh air passage; the indoor return air enters through the exhaust inlet 3, enters the exhaust lower air duct below the fresh air fan 5, and then flows through the total heat exchange core 10 (from the lower right side to the upper left side of the total heat exchange core 10) to the exhaust fan 6, and then flows out through the exhaust air outlet 4. The passage for the exhaust air to flow in the total heat exchange fresh air unit is the exhaust passage. When the total heat exchange fresh air unit needs to defrost, control the fresh air inlet 1, fresh air outlet 2, exhaust inlet 3, and exhaust outlet 4 to be closed, and open the on-off structure, so that the air outlet side of the exhaust fan 6 is connected to the fresh air lower air duct, and the air outlet side of the fresh air fan 5 is connected to the exhaust lower air duct. The air flow direction is that the air flow discharged from the fresh air fan 5 flows to the exhaust lower air duct, the air flow in the exhaust lower air duct flows through the total heat exchange core 10 (from the lower right side to the upper left side of the total heat exchange core 10) and then flows to the exhaust fan 6, the air flow flowing out of the exhaust fan 6 flows to the fresh air lower air duct, and the air flow in the fresh air lower air duct flows through the total heat exchange core 10 (from the lower left side to the upper right side of the total heat exchange core 10) and then flows to the fresh air fan 5.

[0031] Regarding the on-off structure, the on-off structure includes two on-off components, and the air outlet side of the exhaust fan 6 and the air outlet side of the fresh air fan 5 respectively correspond to one on-off component. When the on-off structure is open, it means that both on-off structures are open. When the on-off structure is closed, it means that both on-off structures are closed. The on-off component is a wind valve structure. Refer to Figure 1 . It shows the fresh air side wind valve 12 and the exhaust side wind valve 11. When the fresh air side wind valve 12 is open, the air outlet side of the fresh air fan 5 is connected to the exhaust lower air duct; when the exhaust side wind valve 11 is open, the air outlet side of the exhaust fan 6 is connected to the fresh air lower air duct. Regarding the specific structure of the wind valve structure, the existing technology can be adopted and will not be elaborated here too much.

[0032] A temperature and humidity sensor 7 is provided on the total heat exchange core 10 of the total heat exchange fresh air fan. The temperature and humidity sensor 7 is arranged on the fresh air passage of the total heat exchange core 10. Preferably, the temperature and humidity sensor 7 is arranged on the fresh air outlet side of the total heat exchange core 10. The temperature and humidity sensor 7 is connected to the control device of the fresh air system. The temperature and humidity sensor 7 detects the temperature and humidity of the air flow on the fresh air outlet side of the total heat exchange core 10 to be used for judging the frosting condition of the total heat exchange fresh air fan. The temperature and humidity sensor 7 detects the fresh air temperature and relative humidity. The control device judges and analyzes the detected relative humidity and the saturated humidity corresponding to the currently detected temperature as a factor for considering the frosting condition.

[0033] A pressure sensor 8 is provided on the total heat exchange core 10 of the total heat exchange fresh air fan. The pressure sensor 8 is arranged on the exhaust air passage of the total heat exchange core 10. The pressure sensor 8 is arranged on the return air outlet side of the total heat exchange core 10. The pressure sensor 8 is connected to the control device of the fresh air system. The pressure sensor 8 detects the air pressure of the air flow on the fresh air inlet side of the total heat exchange core 10 to be used for judging the frosting state of the total heat exchange fresh air fan. When the air pressure is high, it indicates that the frosting degree of the total heat exchange core 10 is large. When the air pressure is low, it indicates that the frosting degree of the total heat exchange core 10 is small.

[0034] A fresh air system includes the total heat exchange fresh air fan provided by the present invention. Regarding the structure of the total heat exchange fresh air fan, it has been specifically described above and will not be elaborated here.

[0035] A defrosting method for a total heat exchange fresh air fan includes the following steps: judging whether the total heat exchange fresh air fan meets the defrosting condition; if it meets, controlling the four air outlets of the total heat exchange fresh air fan to close, opening the on-off structure and starting the heating device 9, and defrosting the total heat exchange core 10 by the flow of air in the closed air duct.

[0036] That is, when the total heat exchange fresh air fan is working normally, i.e., when the fresh air fan 5 and the exhaust fan 6 are running, the frosting condition of the total heat exchange fresh air fan is detected. When it is judged that the total heat exchange fresh air fan meets the defrosting condition, the fresh air inlet 1, the fresh air outlet 2, the exhaust inlet 3 and the exhaust outlet 4 are closed, and the on-off structure is opened, so that the air outlet side of the exhaust fan 6 is connected to the fresh air lower air duct, and the air outlet side of the fresh air fan 5 is connected to the exhaust lower air duct. The air flow direction is that the air flow discharged from the fresh air fan 5 flows into the exhaust lower air duct. The air flow in the exhaust lower air duct flows through the total heat exchange core 10 (from the lower right side to the upper left side of the total heat exchange core 10) and then flows to the exhaust fan 6. The air flow flowing out of the exhaust fan 6 flows into the fresh air lower air duct. The air flow in the fresh air lower air duct flows through the total heat exchange core 10 (from the lower left side to the upper right side of the total heat exchange core 10) and then flows to the fresh air fan 5. The heating device 9 is started, and the heating device 9 heats the air flow in the closed air duct. The hot air flow can defrost the total heat exchange core 10. The defrosting method provided by the present invention can achieve rapid defrosting and avoid the problems that the defrosting effect of the core in the prior art is limited by the indoor air temperature and the defrosting time is long.

[0037] The defrosting method further includes: judging whether the defrosting end condition is met; if so, controlling the opening of the four air outlets of the total heat exchange fresh air fan, closing the on-off structure and the heating device 9. At this time, the total heat exchange fresh air fan works normally. Refer to Figure 1 , when the total heat exchange fresh air fan is working normally, fresh air enters from the fresh air inlet 1 and enters the fresh air lower air duct below the exhaust fan 6, and then flows through the total heat exchange core 10 (from the lower left side to the upper right side of the total heat exchange core 10) to the fresh air fan 5, and then is discharged from the fresh air outlet 2. The passage of the fresh air flowing in the total heat exchange fresh air fan is the fresh air passage; the indoor return air enters through the discharge inlet 3, enters the exhaust lower air duct below the fresh air fan 5, and then flows through the total heat exchange core 10 (from the lower right side to the upper left side of the total heat exchange core 10) to the exhaust fan 6, and then flows out through the exhaust air outlet 4. The passage of the exhaust air flowing in the total heat exchange fresh air fan is the exhaust air passage.

[0038] Preferably, the defrosting method further includes: when the total heat exchange core 10 is defrosting, detecting the degree of defrosting of the total heat exchange core 10; judging whether the condition for reducing the power of the heating device is met according to the degree of defrosting; if so, controlling the reduction of the power of the heating device 9. That is, when the total heat exchange core 10 is defrosting, when the defrosting reaches a certain degree, the power of the heating device 9 can be appropriately reduced.

[0039] Alternatively, when the condition for reducing the power of the heating device is met, the heating device can be turned off, the on-off structure can be closed, the exhaust inlet 3 and the exhaust outlet 4 can be opened, the fresh air inlet 1 and the fresh air outlet 2 can be closed, the exhaust fan 6 can be started, and the fresh air fan 5 can be closed. The total heat exchange core 10 is heated and defrosted by the indoor air passing through the fresh air fan.

[0040] Regarding the judgment of the frosting degree, the temperature, humidity and / or air pressure of the total heat exchange fresh air unit are detected; the frosting condition of the total heat exchange fresh air unit is judged by judging the temperature, humidity and / or air pressure. Preferably, the temperature, humidity and air pressure are comprehensively considered to judge the frosting situation and degree. For specific judgment, existing technologies can be adopted. For example, defrosting starts when the detected humidity reaches 60% of the saturated humidity at the corresponding temperature; defrosting starts when the pressure value reaches the preset pressure value, that is, defrosting starts as long as any one of the two methods is satisfied.

[0041] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A total heat exchange fresh air machine, characterized in that, It includes a heating device (9) and a switching structure. Among them, a fresh air passage and an exhaust air passage are provided in the total heat exchange fresh air fan. When the switching structure is in the open state, it can connect the fresh air passage and the exhaust air passage to form a closed air duct, and the heating device (9) is arranged on the closed air duct; the total heat exchange fresh air fan further includes a total heat exchange core (10). The total heat exchange fresh air fan includes an exhaust air fan (6) and a fresh air fan (5). The exhaust air fan (6) and the fresh air fan (5) are arranged on both sides of the total heat exchange core (10). A fresh air lower air duct is arranged below the exhaust air fan (6), and an exhaust air lower air duct is arranged below the fresh air fan (5). When the switching structure is in the open state, the air outlet side of the exhaust air fan (6) is connected to the fresh air lower air duct, and the air outlet side of the fresh air fan (5) is connected to the exhaust air lower air duct; the switching structure includes two switching components, and the air outlet side of the exhaust air fan (6) and the air outlet side of the fresh air fan (5) respectively correspond to one of the switching components.

2. The total heat exchange fresh air unit according to claim 1, characterized in that, The heating device (9) is installed on the total heat exchange core (10).

3. The total heat exchange fresh air unit according to claim 2, characterized in that, The heating device (9) is plugged into the total heat exchange core (10).

4. The total heat exchange fresh air unit according to claim 1, characterized in that The heating device (9) is an electric heating device.

5. The total heat exchange fresh air unit according to claim 1, characterized in that, The switching component is a wind valve structure.

6. The total heat exchange fresh air unit according to claim 1, characterized in that, A temperature and humidity sensor (7) is arranged on the total heat exchange core (10) of the total heat exchange fresh air fan. The temperature and humidity sensor (7) is arranged on the fresh air passage of the total heat exchange core (10), and the temperature and humidity sensor (7) is connected to the control device of the fresh air system.

7. The total heat exchange fresh air unit according to claim 1, wherein, A pressure sensor (8) is arranged on the total heat exchange core (10) of the total heat exchange fresh air fan. The pressure sensor (8) is arranged on the exhaust air passage of the total heat exchange core (10), and the pressure sensor (8) is connected to the control device of the fresh air system.

8. A fresh air system, characterized in that, It includes the total heat exchange fresh air fan according to any one of claims 1-7.

9. A defrosting method for the total heat exchange fresh air unit according to any one of claims 1-7, characterized in that, It includes the following content: Judge whether the total heat exchange fresh air fan meets the defrosting condition; If it is satisfied, control the four air outlets of the total heat exchange fresh air fan to close, open the switching structure and start the heating device (9), and defrost the total heat exchange core (10) by the flow of air in the closed air duct.

10. The defrosting method according to claim 9, characterized in that, It further includes: When the total heat exchange core (10) is defrosting, detect the degree of defrosting of the total heat exchange core (10); Judge whether the condition for reducing the power of the heating device is met according to the degree of defrosting; If it is satisfied, control to reduce the power of the heating device (9).

11. The defrosting method according to claim 9, characterized in that, It includes: Detect the temperature, humidity and / or air pressure of the total heat exchange fresh air fan; Judge the frosting condition of the total heat exchange fresh air fan by judging the temperature, humidity and / or air pressure.

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