Full heat exchanger

Abstract

The present application discloses a total heat exchanger, comprising: a self-cleaning system disposed between a fresh air duct and a polluted air duct; the self-cleaning system comprising: an air plate formed with a desorption duct and a storage space connected to the middle of the desorption duct, the desorption duct having a desorption inlet and a desorption outlet at either end, the desorption inlet and the desorption outlet respectively connected to the polluted air duct; a filter wheel rotatably disposed in the storage space, wherein, on the windward projection of the filter wheel, the area where the filter wheel and the desorption duct overlap is a desorption zone, and the remaining area on the filter wheel is an adsorption zone, which is used to adsorb pollutants carried by the outdoor fresh air; a desorption fan disposed corresponding to the desorption inlet; under the action of the desorption fan, air enters the desorption duct from the desorption inlet, purges the filter wheel, and then blows the pollutants back to the polluted air duct through the desorption outlet. This total heat exchanger has a self-cleaning function, which can significantly extend the replacement and cleaning cycle of the filter screen.

Description

Technical Field

[0001] The present application relates to the field of air treatment technology, and in particular to a total heat exchanger. Background Art

[0002] At present, full heat exchangers will have various built-in air purification modules according to different needs, such as HEPA filters, activated carbon filters, formaldehyde filters, etc. These filters have a service life. When the filter is saturated with adsorption, it needs to be manually cleaned and replaced regularly, which increases the user's workload and reduces the user experience. In addition, the machine needs to be shut down when replacing and maintaining the filter, which affects user use. Summary of the Invention

[0003] The present application provides a full heat exchanger with a self-cleaning function, which can significantly extend the replacement and cleaning cycle of the filter and improve the user experience.

[0004] and a filter wheel, wherein the filter wheel and the desorption duct are connected to each other through the filter wheel, and the filter wheel has a plurality of filter elements, wherein the filter wheel has a plurality of filter elements ...

[0005] In some embodiments, the desorption air duct includes: a first desorption air duct having a desorption inlet; a second desorption air duct, which and the first desorption air duct are located on both sides of the accommodating space, and the desorption outlet is located on the second desorption air duct; the first desorption air duct is farther away from the fresh air inlet of the fresh air duct than the second desorption air duct.

[0006] In some embodiments, the fresh air duct has a fresh air channel located between the fresh air inlet and the heat exchange core, and the dirty air duct has an exhaust channel located between the heat exchange core and the exhaust outlet; the fresh air channel and the exhaust channel are arranged adjacent to each other; the desorption duct is connected to the exhaust channel, and the filter wheel is located in the fresh air channel.

[0007] In some embodiments, the desorption outlet faces the exhaust side of the exhaust channel.

[0008] In some embodiments, the wind plate includes a first wind plate and a second wind plate, and the gap between the first wind plate and the second wind plate forms an accommodating space; the first desorption air duct is formed on the first wind plate, and the second desorption air duct is formed on the second wind plate.

[0009] In some embodiments, it also includes: a first air valve, arranged at the fresh air inlet of the fresh air duct, for opening or closing the fresh air inlet; a second air valve, arranged at the exhaust outlet of the dirty air duct, for opening or closing the exhaust outlet; a third air valve, for connecting or isolating the fresh air duct and the dirty air duct, and located between the fresh air inlet and the self-cleaning system; a supply fan, arranged at the supply air outlet of the fresh air duct, for driving the flow of outdoor air; an exhaust fan, arranged at the exhaust outlet, for driving the flow of indoor air; in the heat exchange mode, the first air valve and the second air valve are opened, the third air valve is closed, and the supply fan and the exhaust fan are turned on; in the internal circulation mode, the first air valve and the second air valve are closed, the third air valve is opened, the exhaust fan is turned off, and the supply fan is turned on; the indoor air passes through the dirty air duct, enters the fresh air duct through the third air valve, is filtered by the filter wheel, and then enters the room from the supply air outlet.

[0010] In some embodiments, it includes: a drive motor for driving the filter wheel to rotate; a pressure sensor for detecting the pressure difference P on both sides of the filter wheel; a controller for adjusting the speed of the drive motor and the frequency of the desorption fan according to the pressure difference P in the heat exchange mode.

[0011] In some embodiments, the controller is used to: when P<P1, control the drive motor to operate at a speed of V1 and the desorption fan to operate at a frequency of H1; when P1≤P≤P2, increase the speed of the drive motor to V2, and maintain the desorption fan at a frequency of H1; if this state continues to run for T1 time and still satisfies P1≤P≤P2, the drive motor maintains the speed V2 unchanged and increases the frequency of the desorption fan to H2; when P>P2, maintain the speed V2 of the drive motor unchanged, and increase the frequency of the desorption fan to H3. If P>P2 is still satisfied after running in this state for T2 time, an alarm prompting manual cleaning is issued; wherein, P1, P2, V1, V2, H1, H2, H3, T1, and T2 are all preset values, and P1<P2, V1<V2, and H1<H2<H3.

[0012] In some embodiments, the controller is used to: issue an inquiry notification asking whether to continue running when an alarm prompt occurs, and if a "yes" instruction is received, continue running until shutting down; and continue to issue alarm prompts and inquiry notifications when the user turns on the computer next time, and shut down when a "no" instruction is received.

[0013] In some embodiments, the controller is used to: in the internal circulation mode, when P<P1, maintain the internal circulation mode; when P1≤P≤P2, issue an alarm prompt to the user that self-cleaning is required, and if a "yes" is received, switch to the heat exchange mode; if a "no" is received, continue to maintain the internal circulation mode; when P>P2, the system is automatically forced to enter the heat exchange mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 shows a schematic diagram of a total heat exchanger according to some embodiments;

[0015] Figure 2 shows a schematic diagram of a self-cleaning system according to some embodiments;

[0016] Figure 3 shows a cross-sectional view of a self-cleaning system according to some embodiments;

[0017] Figure 4 and Figure 5 shows a perspective view of a self-cleaning system according to some embodiments;

[0018] Figure 6 shows an exploded view of a self-cleaning system according to some embodiments;

[0019] Figure 7 shows a schematic diagram of a wind panel according to some embodiments;

[0020] Figure 8 shows a schematic diagram of a full heat exchanger in a heat exchange mode according to some embodiments;

[0021] Figure 9 shows a schematic diagram of a full heat exchanger in an internal circulation mode according to some embodiments;

[0022] Figure 10 and Figure 11 shows a control flow chart of a full heat exchanger in a heat exchange mode according to some embodiments;

[0023] Figure 12 A control flow chart of a full heat exchanger in an internal circulation mode according to some embodiments is shown;

[0024] Figure 13 shows a schematic diagram of a total heat exchanger according to some other embodiments;

[0025] Figure 14 shows a schematic diagram of a total heat exchanger in a high-temperature desorption mode according to some other embodiments;

[0026] Figure 15 shows a control flow chart of a full heat exchanger in an internal circulation mode according to some other embodiments;

[0027] 100. Self-cleaning system; 110. Air plate; 110a. Accommodation space; 1101. Outer frame; 1102. Center; 1103. Support bar; 1104. Through hole; 111. Desorption air duct; 112. First desorption air duct; 113. Second desorption air duct; 114. First air plate; 115. Second air plate; 116. First opening; 117. Desorption inlet; 118. Second opening; 119. Desorption outlet; 120. Filter wheel; 121. Adsorption zone; 122. Desorption zone; 123. Rotating shaft; 130. Desorption fan; 140. Drive motor; 150. Belt; 160. Heating device; 170. Temperature sensor;

[0028] 200. Casing; 201. Fresh air inlet; 202. Supply air outlet; 203. Return air inlet; 204. Exhaust outlet; 205. Fresh air duct; 206. Supply air duct; 207. Return air duct; 208. Exhaust duct; 210. Heat exchange core; 220. Supply air fan; 230. Exhaust fan; 240. Fresh air primary filter; 250. Exhaust air primary filter; 260. First air valve; 270. Second air valve; 280. Third air valve; 290. Air quality sensor. DETAILED DESCRIPTION

[0029] In order to make the purpose and implementation of this application clearer, the exemplary implementation of this application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of this application. Obviously, the described exemplary embodiments are only part of the embodiments of this application, not all of the embodiments.

[0030] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0033] The full heat exchanger is a highly efficient and energy-saving heat recovery device that pre-cools or preheats the incoming fresh air by recovering the waste heat from the exhaust.

[0034] The operating principle is as follows: When the product is operating, indoor exhaust air and fresh air flow through the heat exchange core in a cross-flow pattern. Due to the temperature and vapor partial pressure differences between the two airflows, a full heat exchange process occurs within the heat exchange core. In summer operation, the fresh air receives cooling from the air conditioner exhaust air, lowering its temperature. Simultaneously, it is dried by the conditioned air, reducing its moisture content. In winter operation, the fresh air receives heat from the air conditioner exhaust air, raising its temperature. In this way, through the full heat exchange process within the heat exchange core, the fresh air recovers energy from the air conditioner exhaust air.

[0035] See also Figure 1 The total heat exchanger according to the embodiment of the present application includes a casing 200 , a heat exchange core 210 , a blower 220 and an exhaust fan 230 .

[0036] The casing 200 forms the general appearance of the total heat exchanger and is roughly in the shape of a rectangular parallelepiped. A fresh air inlet 201 , an air supply outlet 202 , a return air inlet 203 and an air exhaust outlet 204 are provided on the casing 200 .

[0037] The heat exchange core 210 is disposed in the casing 200 and is used to achieve heat exchange between indoor air and outdoor fresh air.

[0038] A fresh air duct and a dirty air duct are formed in the casing 200 , and the fresh air duct and the dirty air duct are respectively connected to the heat exchange core 210 .

[0039] The fresh air duct connects the fresh air inlet 210 and the air supply outlet 202 for circulating outdoor fresh air; the polluted air duct connects the return air inlet 203 and the exhaust air outlet 204 for circulating indoor air.

[0040] Specifically, the fresh air duct includes a fresh air channel 205 and an air supply channel 206 , and the dirty air duct includes a return air channel 207 and an exhaust air channel 208 .

[0041] The fresh air passage 205 is a passage from the fresh air inlet 201 to one side of the heat exchange core 210 .

[0042] The air supply passage 206 is a passage from one side of the heat exchange core 210 to the air supply port 202 .

[0043] The return air passage 207 is a passage from the return air port 203 to one side of the heat exchange core 210 .

[0044] The exhaust passage 208 is a passage from one side of the heat exchange core 210 to the exhaust port 204 .

[0045] The air supply fan 220 is arranged in the air supply channel 206 corresponding to the air supply outlet 202, and is used to force the outdoor fresh air to flow; the exhaust fan 230 is arranged in the exhaust channel 208 corresponding to the exhaust outlet 204, and is used to force the indoor air to flow.

[0046] When the full heat exchanger is working, under the action of the supply fan 220 and the exhaust fan 230, the indoor air from the return air outlet 203 flows through the heat exchange core 201 through the return air channel 207, and the outdoor fresh air from the fresh air outlet 201 flows through the heat exchange core 201 through the fresh air channel 205. The two air streams exchange heat at the full heat exchange core 210. The indoor air after heat exchange is blown to the exhaust outlet 204 through the exhaust channel 208, and the outdoor fresh air after heat exchange is blown to the supply air outlet 202 through the supply air channel 206.

[0047] For example, when the full heat exchanger operates in the summer cooling period, the outdoor fresh air obtains cooling energy from the indoor air, causing the temperature to decrease; when it operates in the winter heating period, the outdoor fresh air obtains heat energy from the indoor air, causing the temperature to increase.

[0048] The total heat exchanger of the embodiment of the present application further includes a self-cleaning system 100, which can perform self-cleaning while filtering outdoor fresh air.

[0049] Reference Figures 2 to 6 The self-cleaning system 100 includes an air plate 110 , a filter wheel 120 and a desorption fan 130 .

[0050] The air plate 110 is formed with an accommodating space 110a and a desorption air duct 111. The accommodating space 110a is located in the middle of the desorption air duct 111 and is connected to the desorption air duct 111. Both ends of the desorption air duct 111 are connected to the dirty air duct respectively.

[0051] The filter wheel 120 is rotatably connected to the accommodating space 110 a and is located in the fresh air duct. Outdoor fresh air is filtered when flowing through the filter wheel 120 in the fresh air duct.

[0052] The filter wheel 120 has an adsorption area 121 and a desorption area 122, wherein, on the projection of the windward surface of the filter wheel 120, the desorption area 122 of the filter wheel 120 always overlaps with the desorption air duct 111, and the adsorption area 121 of the filter wheel 120 is exposed and can filter the outdoor fresh air passing through it.

[0053] During the rotation of the filter wheel 120 , each portion thereof continuously switches between the adsorption zone 121 and the desorption zone 122 .

[0054] For example, taking part A on the filter wheel 120 as a reference, part A filters particulate matter and other pollutants in the outdoor fresh air when it is in the adsorption zone 121, and the particulate matter thereon is swept away when part A rotates to the desorption zone 122 (to be introduced later).

[0055] The desorption fan 130 is provided at one port of the desorption duct 111, thereby blowing the air in the dirty air duct from the port into the desorption duct 111 and blowing it back to the dirty air duct from the other port. For the sake of convenience in the following description, the indoor air entering the desorption duct is referred to as desorption air.

[0056] When the desorption fan 130 is operating, the desorbed air enters the desorption duct 111 and sweeps the desorption zone 122 of the filter wheel 120. The pollutants on the filter wheel 120 are then blown off and follow the desorption air into the polluted air duct. At this time, if the exhaust fan 230 is in operation, the pollutants will be blown by the exhaust fan 130 toward the exhaust port 204 and then discharged outdoors.

[0057] The full heat exchanger of the embodiment of the present application realizes self-cleaning while filtering outdoor fresh air by providing a self-cleaning system 100, thereby extending the replacement and cleaning cycle of the filter and improving the user experience.

[0058] Moreover, the self-cleaning system 100 of the present application connects the port of the desorption air duct 114 to the dirty air duct, so that the pollutants blown off the filter wheel 120 can be discharged to the outside along with the indoor air in the dirty air duct, borrowing the forced action of the existing exhaust fan. Therefore, the desorption fan 130 only needs to blow the pollutants to the dirty air duct, so a small-power and small-volume desorption fan 130 can achieve this purpose, reducing the volume of the self-cleaning system 100 and saving energy.

[0059] In addition, the present application sets a self-cleaning system 100 between the fresh air duct and the dirty air duct, which does not require major changes to the structure of the existing total heat exchanger and has the advantages of simple structure and low cost.

[0060] According to an embodiment of the present application, the air plate 110 includes a first air plate 114 and a second air plate 115. The first air plate 114 and the second air plate 115 are spaced apart, and the space therebetween forms an accommodating space 110a.

[0061] The first desorption air duct 112 is disposed on the first air plate 114 and is provided with a first opening 116 facing the accommodating space 110 a and a desorption inlet 117 extending to the dirty air duct.

[0062] The second desorption air duct 113 is disposed on the second air plate 115 and is provided with a second opening 118 facing the accommodating space 110 a and a desorption outlet 119 extending to the dirty air duct.

[0063] The first opening 116 and the second opening 118 are arranged opposite to each other, so that the desorbed air from the first opening 116 can be blown through the desorption zone 122 and directly enter the second opening 118 .

[0064] According to the embodiment of the present application, most of the pollutants carried in the outdoor fresh air are located on the windward side of the filter wheel 120. The second desorption air duct 113 is closer to the fresh air inlet 201 than the first desorption air duct 112. In other words, the second desorption air duct 113 is located on the windward side of the filter wheel 120, and the first desorption air duct 112 is located on the leeward side of the filter wheel 120. In this way, the desorbed air is blown from the first desorption air duct 112 toward the filter wheel 120, achieving reverse cleaning of the filter wheel 120 and facilitating the backwash of pollutants.

[0065] In some embodiments of the present application, reference is made to Figure 7 On the projection surface of the first opening 116 , part of the radius of the filter wheel 120 is located within the first opening 116 . In this way, after the filter wheel 120 rotates one circle, all parts of the filter wheel 120 can pass through the first opening 116 , so that the desorbed air can be blown to all parts of the filter wheel 120 .

[0066] In the present example, the first opening 116 and the second opening 118 are fan-shaped.

[0067] According to an embodiment of the present application, the wind plate 110 is generally in the shape of a rectangular plate, and includes an outer frame portion 1101 , a central portion 1102 and support bars 1103 .

[0068] The outer frame portion 1101 has a rectangular shape and has a circular through hole 1104 thereon. The central portion 1102 is located at the center of the through hole 1104 . The support bar 1103 is connected between the outer frame portion 1101 and the central portion 1102 .

[0069] Rotating shafts 123 are provided on both sides of the filter wheel 120 and are inserted into the center portion 1102, thereby allowing rotation relative to the center portion 1102. Outdoor fresh air flows through the through-holes 1104 of the second air plate 115, the adsorption area 121 of the filter wheel 120, and the through-holes 1104 of the first air plate 114.

[0070] The filter wheel 120 is driven to rotate by a drive motor 140 and a belt 150. The drive motor 140 can be mounted on the air plate 110, and the belt 150 is wound around the filter wheel 120 and the driving wheel of the drive motor 140. The filter wheel 120 is driven by the drive motor 140 and rotated by the belt 150.

[0071] In some embodiments of the present application, reference is made to Figure 8 The fresh air channel 205 and the exhaust air channel 208 are arranged adjacent to each other, and the self-cleaning system 100 is arranged between the fresh air channel 205 and the exhaust air channel 208.

[0072] The outdoor fresh air enters the fresh air channel 205 from the fresh air inlet 201, is filtered by the filter wheel 120, and then passes through the heat exchange core 201. In this way, the outdoor fresh air has been filtered by the filter wheel 120 before entering the heat exchange core 210, which can prevent pollutants in the outdoor fresh air from adhering to the heat exchange core 210 and affecting the heat recovery performance of the full heat exchanger.

[0073] At the same time, the exhaust passage 208 is located downstream of the heat exchange core 210, and the pollutants blown out by the desorbed air are directly discharged from the exhaust port 204, which can prevent the pollutants from entering the heat exchange core 210 through the exhaust duct.

[0074] The filter wheel 120 is located in the fresh air channel 205 , the desorption inlet 117 of the first desorption air channel 112 extends into the exhaust air channel 208 , and the desorption outlet 119 of the second desorption air channel 113 extends into the exhaust air channel 208 .

[0075] The desorption inlet 117 and the desorption outlet 119 are oriented in different directions within the exhaust duct 208. In this way, the two ports can be prevented from being too close to each other and causing interference with the surrounding air.

[0076] Specifically, the desorption inlet 117 is directly opened at the end of the first desorption air duct 112 and is perpendicular to the desorption outlet 119 .

[0077] The desorption outlet 119 faces the exhaust port 204 , which helps the desorbed air to blow the pollutants toward the exhaust port 204 for discharge.

[0078] In some embodiments of the present application, the total heat exchanger further includes a fresh air primary filter 240 and / or an exhaust air primary filter 250 .

[0079] The fresh air primary filter 240 is used for preliminary filtering of outdoor fresh air. It is located between the fresh air inlet 201 and the self-cleaning system 100. The outdoor fresh air is first filtered by the fresh air primary filter 240 and then filtered by the self-cleaning system 100.

[0080] The filter wheel 120 in the self-cleaning system 100 may be a HEPA filter. The combined filtering effect of the primary filter and the HEPA filter is better.

[0081] The exhaust primary filter 250 is provided at the return air inlet 203 for filtering the indoor air.

[0082] In some embodiments of the present application, the total heat exchanger further includes a first air valve 260 , a second air valve 270 and a third air valve 280 .

[0083] The first air valve 260 is provided at the fresh air inlet 201 for opening or closing the fresh air inlet 201. The second air valve 270 is provided at the exhaust outlet 204 for opening or closing the exhaust outlet 204. It is understood that the first air valve 260 can also be provided at the air supply outlet 202, and the second air valve 270 can also be provided at the return air outlet 203.

[0084] The third air valve 280 is disposed between the fresh air passage 205 and the exhaust air passage 208 , and is located between the fresh air inlet 201 and the self-cleaning system 100 .

[0085] By controlling the first air valve 260 , the second air valve 270 and the third air valve 280 , the switching of different modes of the total heat exchanger can be achieved.

[0086] Heat exchange mode: refer to Figure 8 The thin arrows in the figure indicate the flow path of the heat exchange between the outdoor fresh air and the indoor air, and the thick arrows in the figure indicate the flow path of the desorbed air. The first air valve 260 is opened, the second air valve 270 is opened, the third air valve 280 is closed, the exhaust fan 230 is turned on, and the supply fan 220 is turned on. The indoor air enters the return air duct 207 of the total heat exchanger through the return air port 203, and first passes through the exhaust primary filter 250 to filter large particles and hair and other pollutants in the air, and then passes through the heat exchange core 210 and enters the exhaust duct 208, and is discharged to the outside through the exhaust port 204 by the exhaust fan 230;

[0087] Outdoor fresh air enters the full heat exchanger from the fresh air inlet 201, first passes through the fresh air primary filter 240 to filter out large particles and hair and other pollutants in the air, and then enters the adsorption area 121 of the filter wheel 120. The fine particles in the fresh air are intercepted by the adsorption area 121 and adsorbed onto the windward surface of the filter wheel 120. As the filter wheel 120 rotates, the original adsorption area gradually becomes the desorption area 122. In the desorption area 122, under the action of the desorption fan 130, the desorbed air enters the first desorption duct 112 to backblow the filter wheel 120. The backblown pollutants enter the second desorption duct 113 and enter the exhaust channel 208 from the desorption outlet 119. Under the action of the exhaust fan 230, the pollutants are discharged from the exhaust port 204; the purified fresh air passes through the heat exchange core 210 and is sent into the room through the air port 202 by the blower 220 to adjust the indoor air quality.

[0088] Inside the heat exchange core 210, exhaust air and fresh air undergo a heat exchange process, transferring the heat of the indoor air to the fresh air and returning it to the room, thereby achieving the purpose of saving energy and reducing energy consumption.

[0089] Internal circulation mode: refer to Figure 9 The arrows in the figure indicate the flow path of indoor air. The first air valve 260 is closed, the second air valve 270 is closed, the third air valve 280 is opened, the exhaust fan 230 is turned off, and the supply fan 220 is turned on. The indoor air enters the return air duct 207 of the full heat exchanger through the return air port 203. It first passes through the exhaust primary filter 250 to filter large particles and hair and other pollutants in the air, and then passes through the heat exchange core 210 to enter the exhaust duct 208, and then passes through the third air valve 280 to enter the fresh air duct 205, passes through the fresh air primary filter 240 and the adsorption area 121 of the filter wheel 120, and the purified fresh air passes through the heat exchange core 210 and is sent back to the room through the air port 202 by the supply fan 220 to achieve the purpose of purifying the indoor air.

[0090] In the internal circulation mode, since the indoor air is not discharged to the outside, the desorbed pollutants cannot be effectively discharged. Therefore, the desorption fan 130 is turned off and the filter wheel 120 is stationary. At this time, the self-cleaning system 100 only has a filtering function but does not perform self-cleaning.

[0091] In some embodiments of the present application, the total heat exchanger further includes a pressure sensor, which is disposed on both sides of the filter wheel 120 and is used to detect the pressure difference P on both sides of the filter wheel 120 .

[0092] Based on the above embodiment, the control process of the full heat exchanger is described in detail below:

[0093] Reference Figure 10 When the user selects the heat exchange mode, the controller will automatically open the first air valve and the second air valve, keep the third air valve in the closed state, and turn on the supply fan and exhaust fan at the same time. The machine starts to operate normally, then turns on the desorption fan and starts the drive motor, and the self-cleaning system starts to work.

[0094] The controller adjusts the speed of the drive motor and the frequency of the desorption fan according to the pressure difference P on both sides of the filter wheel, so as to improve the purification efficiency of the filter wheel.

[0095] Among them, reference Figure 11 The specific method of adjusting the speed of the driving motor and the frequency of the desorption fan according to the pressure difference P on both sides of the filter wheel is as follows:

[0096] When P<P1, the driving motor runs at a low speed V1 and the desorption fan runs at a low frequency H1. At this time, the filter wheel rotates at a slow speed and the desorption fan runs at a low frequency.

[0097] When P1≤P≤P2, the speed of the drive motor is increased to V2, and the desorption fan is maintained at the low frequency H1. If this state continues for t1 time and still satisfies P1≤P≤P2, the speed of the drive motor is maintained at V2, and the frequency of the desorption fan is increased to H2.

[0098] Under this condition, it means that the resistance of the filter wheel increases and pollutants begin to accumulate on it. Therefore, increasing the speed of the filter wheel can improve the desorption effect of the dust on the wheel, thereby reducing the pressure difference P. After this state continues to operate for t1 = 10 minutes, if P is still ≥ P1, it means that the current operating state cannot effectively desorb the pollutants on the wheel. At this time, the drive motor speed is no longer increased, but the speed V2 is maintained unchanged, and the desorption fan frequency is increased to H2. Increasing the frequency of the desorption fan can increase the air volume and pressure of the desorbed air and improve the desorption capacity of pollutants on the wheel. If the pressure difference P decreases at this time, repeat the above steps according to the size of P. If the pressure difference P still does not decrease or even continues to increase, maintain this state unchanged.

[0099] When P>P2, the speed of the drive motor V2 is maintained unchanged, and the frequency of the desorption fan is increased to H3. If P>P2 is still satisfied after running for t2 in this state, an alarm prompt is issued. The alarm prompt may be "the filter wheel needs to be manually cleaned or replaced."

[0100] Under these conditions, if P > P2, it indicates that contaminants have accumulated significantly on the rotor surface, impacting the efficiency of the heat exchanger. Maintain the drive motor speed (V2) and continue increasing the desorption fan frequency to H3, further increasing the desorption fan's air volume and pressure. If the increase reduces the rotor pressure differential (P), repeat the above steps based on the P value. If, after t2 = 30 minutes of continuous operation, the P value still cannot be reduced to P2, the self-cleaning function is no longer effectively cleaning the filter rotor, and manual cleaning is required.

[0101] In addition, when an alarm is triggered, a notification "Do you want to continue operation?" can be issued. If the user selects "Yes", the system will continue to operate according to the existing logic until it shuts down. The next time the user turns on the system, the alarm will continue to be issued until the user selects "No", at which point the system will shut down and wait for the user to replace the filter wheel.

[0102] In the above control method, P1, P2, V1, V2, H1, H2, H3, t1, and t2 are all preset values, and P1 < P2, V1 < V2, and H1 < H2 < H3.

[0103] In some embodiments of the present application, reference is made to Figure 12When the user selects internal circulation mode, the controller automatically opens the third air valve, keeps the first and second air valves closed, turns on the supply fan, and keeps the exhaust fan off, and the machine begins normal operation. The desorption fan and drive motor remain off, and the self-cleaning system does not operate.

[0104] The controller issues a mode switching instruction based on the pressure difference P on both sides of the filter wheel.

[0105] Specifically, when P < P1, the system operates normally and maintains the status quo;

[0106] When P1≤P≤P2, an alarm is issued to the user to prompt "whether to perform self-cleaning". If a "yes" instruction is received, the system switches to the heat exchange mode; if a "no" instruction is received, the system continues to maintain the internal circulation mode.

[0107] When P>P2, the system automatically enters heat exchange mode. Under this condition, it indicates that the contaminants on the rotor surface have accumulated seriously, affecting the working efficiency of the full heat exchanger. The system automatically forces the system to enter heat exchange mode and the self-cleaning function automatically activates to discharge the contaminants on the rotor through the exhaust port.

[0108] In the above embodiments, when the air contains odor, formaldehyde, bacteria, viruses, TVOC and other substances, the filter wheel made of porous materials such as activated carbon and molecular sieve can adsorb such pollutants. However, even if the pollutants are adsorbed on the wheel, they cannot be directly desorbed by backblowing with a desorption fan. To address this problem, in some embodiments of the present application, reference is made to Figure 13 A heating device 160 is added to desorb polluted gases through high temperature. The heating device 160 can be an electric heater, which is turned on and off.

[0109] The heating device 160 is disposed within the first desorption duct 112 and is used to heat the desorbed air, thereby heating the filter wheel 120. Depending on the material of the wheel, it can be heated to 70-150°C. Under these temperature conditions, bacteria and viruses intercepted by the filter wheel 120 are inactivated under high temperature conditions, thereby achieving a sterilization and disinfection effect. Odor molecules and gaseous pollutants such as TVOCs are re-volatilized under these temperature conditions, thus completing the desorption process. The desorbed gaseous pollutants enter the second desorption duct 113 and enter the exhaust channel 208 from the desorption outlet 119. Under the action of the exhaust fan 230, the polluted gases are discharged from the exhaust outlet 204.

[0110] In some embodiments of the present application, a temperature sensor 170 is further included in the second desorption air duct 113 for real-time monitoring of the desorption temperature to prevent poor desorption effect due to too low a temperature and to prevent the rotor from catching fire and causing danger due to too high a temperature.

[0111] The addition of the heating device 160 enables the full heat exchanger to have a high-temperature desorption mode:

[0112] Reference Figure 14 First air valve 270 is closed, second air valve 270 is open, third air valve 280 is closed, blower 220 is turned off, exhaust fan 230 is turned on, the polluted air duct is opened, and the fresh air duct is closed. Heating device 160 is operating. As filter wheel 120 rotates, the gaseous pollutants thereon continuously evaporate under the action of high temperature. Under the action of desorption fan 130, the desorbed air blows the gaseous pollutants into second desorption duct 113, and then into exhaust channel 208 through desorption outlet 119. Exhaust fan 230 then discharges the pollutants through exhaust outlet 204.

[0113] Because the resistance on both sides of the filter wheel 120 has little effect when adsorbing gaseous pollutants, the pressure difference P on both sides of the filter wheel cannot be used as a basis for determining whether the wheel needs to be cleaned. Therefore, in some embodiments of the present application, the value of the air sensor module is used as a judgment basis to control the operation mode of the self-cleaning system.

[0114] The total heat exchanger includes an air quality sensor 290 disposed in the air supply channel 206 for monitoring the quality of the air blowing toward the air supply port 202 in real time.

[0115] Depending on the actual application environment, the air quality sensor 290 can be a single TVOC or formaldehyde sensor, or a sensor module that uses multiple sensors in combination. The module can simultaneously monitor common pollutants such as PM2.5, formaldehyde, and TVOC.

[0116] Based on the above embodiments, the system control processes in different modes are described in detail below.

[0117] When the user selects heat exchange mode, the system operates based on the pressure differential P, and its specific operation is the same as in the heat exchange mode of the above embodiment. This is because in heat exchange mode, the air entering the room is primarily fresh air from outside, and the pollutants in this fresh air are mainly particulate matter, with almost no bacteria, viruses, formaldehyde, TVOC, odor, or other pollutants. Therefore, as in the above embodiment, the heating device remains off in this mode and does not turn on.

[0118] Reference Figure 10 、 Figure 11 , the controller opens the first air valve and the second air valve, keeps the third air valve in the closed state, and turns on the supply fan and exhaust fan at the same time. The machine starts to run normally, then turns on the desorption fan and starts the drive motor, and the self-cleaning system starts to work.

[0119] When P<P1, the driving motor operates at a low speed V1 and the desorption fan operates at a low frequency H1.

[0120] When P1≤P≤P2, the speed of the drive motor is increased to V2, and the desorption fan is maintained at the low frequency H1. If this state continues for t1 time and still satisfies P1≤P≤P2, the speed of the drive motor is maintained at V2, and the frequency of the desorption fan is increased to H2.

[0121] When P>P2, the speed of the drive motor V2 is maintained unchanged, and the frequency of the desorption fan is increased to H3. If P>P2 is still satisfied after running for t2 in this state, an alarm prompt is issued. The alarm prompt may be "the filter wheel needs to be manually cleaned or replaced."

[0122] In addition, when the alarm prompt is issued, a notification "Do you want to continue running" can be issued. If the user selects "Yes", the existing logic will continue to be installed and run until the system is shut down. The next time the user turns on the system, the alarm prompt will continue to be issued until the user selects "No", at which point the system will shut down and wait for the user to replace the filter wheel.

[0123] When the user selects the internal circulation mode, refer to Figure 15 The controller automatically opens the third air valve, keeps the first and second air valves closed, turns on the supply fan, and keeps the exhaust fan off, and the machine begins normal operation. The desorption fan and drive motor remain off, the self-cleaning system does not work, and the heating device does not work.

[0124] The controller switches between different operating modes based on the pressure differential P and the air quality value A detected by the air quality sensor. Value A can be a formaldehyde monitoring value, a TVOC monitoring value, and an odor monitoring value, or it can monitor all of them simultaneously. The upper limit of each indicator is taken as the control input command.

[0125] Specifically, when P < P1 and A < A1, the internal circulation mode continues. Under this condition, the system operates normally and does not require self-cleaning. However, as the internal circulation operation time accumulates, contaminants continue to accumulate on the filter wheel, causing the P and A values ​​to gradually increase.

[0126] When P1≤P≤P2, A<A1, an alarm prompting self-cleaning is issued and the user is asked to choose whether to perform self-cleaning. If the user responds with "yes", the system switches to heat exchange mode; otherwise, the system continues to maintain the current internal circulation mode until the system is shut down, and the alarm prompting self-cleaning will continue to be issued after the next system is started.

[0127] Under this condition, the gaseous pollutant indicators are normal and the pressure difference P increases, which means that the particulate matter content in the air is high, blocking the rotor, while the gaseous pollutant content is low. Therefore, only particulate matter removal is required, and high-temperature desorption is not required.

[0128] When P>P2, an alarm is issued to indicate the need for self-cleaning and the system is forced to switch to heat exchange mode. Under this condition, it means that the current particulate matter content in the air is high and the windward side of the rotor is blocked. The A value is no longer a reference.

[0129] When P<P1, A1<A<A2, an alarm prompting high-temperature desorption is issued. If the user chooses high-temperature desorption, it switches to high-temperature desorption mode. If the user chooses to continue running, it continues to maintain the internal circulation mode until the system is shut down. After the next system startup, the alarm prompting high-temperature desorption is issued.

[0130] When A>A2, an alarm is issued indicating that high-temperature desorption is required, and the system is forced to switch to high-temperature desorption mode. This condition indicates that the current content of gaseous pollutants in the air is high, and the micropores in the rotor are saturated with adsorption, making it impossible to effectively adsorb gaseous pollutants. At this time, the P value is no longer a reference.

[0131] When P1≤P≤P2 and A1<A<A2, an alarm prompts that high-temperature desorption is required. If the user selects yes, the system switches to high-temperature desorption mode. If the user selects continue operation, the system continues to operate in internal circulation mode until the system shuts down and continues to issue the alarm prompt after the next system restart. Under these conditions, the content of particulate matter and other pollutants in the air is high, but has not yet reached the upper limit. In addition, in high-temperature desorption mode, particulate matter on the rotor can also be desorbed. Therefore, the system issues an alarm prompting that high-temperature desorption is required.

[0132] It should be noted that P1, P2, A1, and A2 are all preset values, and P1<P2, A1<A2.

[0133] The following is a detailed introduction to the control process in high temperature desorption mode:

[0134] The high-temperature desorption mode requires the assistance of electric heating. If high-temperature desorption is performed directly in the heat exchange mode, the fresh air will cool the rotor, causing the electric heating to work continuously and increase energy consumption. Therefore, when running the high-temperature desorption mode, the system only opens the dirty air duct and closes the fresh air duct.

[0135] After the system enters the high-temperature desorption mode, the first air valve remains closed, the second air valve opens, the third air valve closes, the supply fan turns off, and the exhaust fan turns on; the desorption fan and drive motor start, and the self-cleaning system starts working.

[0136] When the temperature detected by the temperature sensor is T<T1, the heating device is turned on; when T>T2, the heating device is turned off; when T1≤T≤T2, the heating device maintains the working state unchanged, so that the wheel temperature can always be maintained between T1 and T2, so that the gaseous pollutants on the wheel can be effectively desorbed.

[0137] After the high-temperature desorption mode runs for a period of t3, the system re-enters the internal circulation mode. t3 is a preset value for an operation period. For example, t3 can be preset to 20 minutes. After the high-temperature desorption runs for 20 minutes, the system switches to the internal circulation mode.

[0138] When the high-temperature desorption mode switches to the internal circulation mode, if the system is judged to still need high-temperature desorption based on the detection value A, it will re-enter the high-temperature desorption mode and run another cycle; if this situation occurs after running the high-temperature desorption mode for three consecutive times, the system will issue a "wheel needs to be replaced" prompt to the user; if the user agrees to replace it, the system will shut down and wait for the replacement; if the user chooses to continue running, the system will begin to ignore the P and A values ​​and continue to run until it is shut down, and will continue to issue an alarm prompt after the next startup.

[0139] The first concept of the present application is to provide a self-cleaning system 100 to achieve self-cleaning while filtering outdoor fresh air, thereby extending the filter replacement and cleaning cycle and improving the user experience.

[0140] The second concept of the present application is to connect the port of the desorption duct 114 to the dirty air duct, so that the pollutants blown off the filter wheel 120 can be discharged to the outside along with the indoor air in the dirty air duct, borrowing the forced action of the existing exhaust fan. Therefore, the desorption fan 130 only needs to blow the pollutants to the dirty air duct, so a small-power and small-volume desorption fan 130 can achieve this purpose, reducing the volume of the self-cleaning system 100 and saving energy.

[0141] The third concept of the present application is to set a self-cleaning system 100 between the fresh air duct and the dirty air duct, which does not require major changes to the structure of the existing total heat exchanger and has the advantages of simple structure and low cost.

[0142] The fourth concept of the present application is to provide a heating device in the first desorption channel of the self-cleaning system, which can sterilize and desorb gaseous pollutants through high-temperature heating, thereby achieving the effect of purifying gaseous pollutants.

[0143] The fourth concept of the present application is to automatically adjust the rotation speed of the filter wheel and the frequency of the desorption fan according to the pressure difference P on both sides of the filter wheel, thereby improving the self-cleaning effect of the filter wheel and ensuring the purification effect of the filter wheel.

[0144] The fifth concept of the present application can achieve a better desorption effect of solid pollutants and gaseous pollutants based on the pressure difference P on both sides of the filter wheel and the air quality A at the air outlet, thereby improving the purification performance of the product.

[0145] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

[0146] For ease of explanation, the above description has been presented in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations are possible. The above embodiments have been selected and described to better explain the principles and practical applications, thereby enabling those skilled in the art to better utilize the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A total heat exchanger, characterized in that: include: The housing has a fresh air duct and a dirty air duct therein, wherein the fresh air duct is used to circulate outdoor fresh air, and the dirty air duct is used to circulate indoor air; and A self-cleaning system is provided in the housing; the self-cleaning system comprises: an air plate disposed in the fresh air duct, the air plate comprising an outer frame, a central portion, and a support strip; the outer frame having a circular through-hole, the central portion being located at the center of the through-hole, and the support strip being connected between the outer frame and the central portion; the air plate comprising a first air plate and a second air plate, the interval between the first air plate and the second air plate forming an accommodation space; The desorption air duct includes: a first desorption air duct provided on the first air plate, the first desorption air duct having a first opening toward the accommodating space and a desorption inlet extending to the dirty air duct; a second desorption air duct provided on the second air plate, the second desorption air duct having a second opening toward the accommodating space and a desorption outlet extending to the dirty air duct, the first opening and the second opening being arranged opposite to each other; A filter wheel is rotatably disposed in the accommodating space and located in the fresh air duct. On the projection of the windward surface of the filter wheel, the area of ​​the filter wheel that overlaps with the desorption duct is a desorption area, and the other area of ​​the filter wheel is an adsorption area. The adsorption area is used to adsorb pollutants carried by the outdoor fresh air. a desorption fan, which is arranged corresponding to the desorption inlet; When the outdoor fresh air flows, it passes through the through hole of the second wind plate, the adsorption area of ​​the filter wheel, and the through hole of the first wind plate; under the action of the desorption fan, the air enters the desorption air duct from the desorption inlet, sweeps the filter wheel, and blows the pollutants back to the dirty air duct from the desorption outlet.

2. The total heat exchanger according to claim 1, characterized in that The first desorption air duct is farther away from the fresh air outlet of the fresh air duct than the second desorption air duct.

3. The total heat exchanger according to claim 2, characterized in that The fresh air duct has a fresh air channel located between the fresh air inlet and the heat exchange core, and the dirty air duct has an exhaust channel located between the heat exchange core and the exhaust outlet; The fresh air channel and the exhaust channel are arranged adjacent to each other; the desorption air channel is communicated with the exhaust channel, and the filter wheel is located in the fresh air channel.

4. The total heat exchanger according to claim 3, characterized in that The desorption outlet faces the exhaust port side of the exhaust channel.

5. The total heat exchanger according to claim 1, characterized in that Also includes: A first air valve is provided at the fresh air inlet of the fresh air duct, and is used to open or close the fresh air inlet; A second air valve is provided at the exhaust port of the dirty air duct, and is used to open or close the exhaust port; a third air valve, used for connecting or blocking the fresh air duct and the dirty air duct, and located between the fresh air inlet and the self-cleaning system; A blower, provided at the air outlet of the fresh air duct, for driving the flow of outdoor fresh air; An exhaust fan, provided at the exhaust port, for driving indoor air flow; In heat exchange mode, the first and second air valves are open, the third air valve is closed, and the supply and exhaust fans are turned on; In the internal circulation mode, the first and second air valves are closed, the third air valve is open, the exhaust fan is turned off, and the supply fan is turned on; Indoor air passes through the dirty air duct, enters the fresh air duct through the third air valve, is filtered by the filter wheel, and then enters the room from the air supply port.

6. The total heat exchanger according to any one of claims 1 to 5, characterized in that: Also includes: A driving motor, used for driving the filter wheel to rotate; Pressure sensor, used to detect the pressure difference P on both sides of the filter wheel; The controller is used to adjust the speed of the drive motor and the frequency of the desorption fan according to the pressure difference P in the heat exchange mode.

7. The total heat exchanger according to claim 6, characterized in that The controller is used to: When P<P1, the drive motor is controlled to run at a speed of V1, and the desorption fan is controlled to run at a frequency of H1; When P1≤P≤P2, the speed of the drive motor is increased to V2, and the desorption fan is maintained at the frequency H1; if this state continues for t1 time and still satisfies P1≤P≤P2, the speed of the drive motor is maintained at V2, and the frequency of the desorption fan is increased to H2; When P>P2, the speed V2 of the driving motor is maintained unchanged, and the frequency of the desorption fan is increased to H3. If P>P2 is still satisfied after running for t2 time in this state, an alarm prompting manual cleaning is issued; Among them, P1, P2, V1, V2, H1, H2, H3, t1, and t2 are all preset values, and P1 < P2, V1 < V2, and H1 < H2 < H3.

8. The total heat exchanger according to claim 7, characterized in that The controller is used to: When an alarm occurs, a query notification is issued asking whether to continue running. If a "yes" instruction is received, the machine will continue running until it is shut down. The next time the user turns on the device, the device will continue to issue alarm prompts and inquiry notifications until it receives a "no" instruction and turns off the device.

9. The total heat exchanger according to claim 6, characterized in that The controller is used to maintain the inner circulation mode when P < P1 in the inner circulation mode; When P1≤P≤P2, an alarm prompt is issued to the user indicating that self-cleaning is required. If a "yes" is received, the system switches to the heat exchange mode; if a "no" is received, the system continues to maintain the internal circulation mode; When P>P2, the system automatically enters the hot exchange mode.

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