Fresh air machine and control method thereof, air conditioning system

Abstract

The application provides a fresh air machine and a control method thereof, and an air conditioning system. The fresh air machine comprises a shell, a heat pipe and a flow rate adjusting mechanism. The fresh air machine and the control method thereof, and the air conditioning system provided by the application adjust the flow rate of the liquid working medium in the heat pipe by using the flow rate adjusting mechanism, so that the working medium flow in the heat pipe is changed from passive to active, the power of the liquid working medium is effectively improved, the heat exchange capacity of the heat pipe and the energy recovery capacity of the return air are improved, the maximum energy saving is realized under the premise of ensuring the indoor comfort, the use experience of the user is improved, and when the fresh air machine is applied to an air conditioning system with an indoor unit and an outdoor unit, the heat exchange capacity of the heat pipe can also be used to reduce the load of the indoor unit, the indoor unit is linked and controlled, the overcooling and overheating of the indoor unit is effectively avoided, the energy consumption of the outdoor unit and the air conditioning system is reduced, the power waste of the air conditioning system is avoided, and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fresh air handling equipment, in particular to a fresh air machine, a control method thereof and an air conditioning system. BACKGROUND

[0002] With the improvement of living standards, people have higher demands for the comfort and health of living environment. The independent design of the heat pipe type fresh air machine ensures air quality, realizes energy recovery and temperature and humidity adjustment, and is widely used in modern buildings.

[0003] However, the heat pipe type fresh air machine in the prior art only relies on the phase change of the liquid working medium in the heat pipe under the action of pressure difference to exchange heat and recover energy, and has the problems of insufficient power of the liquid working medium, low heat exchange efficiency and insufficient energy recovery, which is difficult to ensure indoor comfort and seriously affects the user experience. SUMMARY

[0004] In order to solve the technical problem of low heat exchange efficiency of the heat pipe type fresh air machine in the prior art affecting user experience, a fresh air machine and a control method thereof and an air conditioning system are provided, which adjust the flow rate of the working medium in the heat pipe by using a flow rate adjusting mechanism to improve the heat exchange efficiency.

[0005] A fresh air machine comprises:

[0006] A shell, wherein a fresh air channel and a return air channel are formed in the shell;

[0007] A heat pipe, wherein the heat pipe is arranged in the shell, and part of the heat pipe is located in the fresh air channel and part of the heat pipe is located in the return air channel;

[0008] A flow rate adjusting mechanism, wherein the flow rate adjusting mechanism is in communication with the heat pipe, and the flow rate adjusting mechanism can adjust the flow rate of the working medium in the heat pipe.

[0009] The number of the heat pipes is at least two, all the heat pipes are arranged side by side, and all the heat pipes are in communication with the flow rate adjusting mechanism.

[0010] The heat pipe comprises a first heat exchange part, an adiabatic part and a second heat exchange part, the first heat exchange part and the second heat exchange part are in communication with each other through the adiabatic part, the first heat exchange part is located in the fresh air channel, the second heat exchange part is located in the return air channel, and the flow rate adjusting mechanism is in communication with the first heat exchange part.

[0011] The first heat exchange part comprises a return flow section and an outflow section, the first end of the return flow section is in communication with the second heat exchange part through the adiabatic part, the second end of the return flow section is in communication with the first end of the outflow section through the flow rate adjusting mechanism, and the second end of the outflow section is in communication with the second heat exchange part through the adiabatic part.

[0012] The fresh air machine further comprises a return flow main pipe and an outflow main pipe, all the return flow sections are communicated with the flow rate adjusting mechanism through the return flow main pipe, and all the outflow sections are communicated with the flow rate adjusting mechanism through the outflow main pipe.

[0013] The first heat exchange part is provided with a fin structure; and / or, the second heat exchange part is provided with a fin structure.

[0014] The fresh air machine further comprises a control device, the control device can acquire an outdoor fresh air temperature and an indoor return air temperature, and the control device is electrically connected with the flow rate adjusting mechanism.

[0015] The fresh air machine further comprises a fresh air temperature sensor, the shell is provided with a fresh air inlet communicated with the fresh air channel, the fresh air temperature sensor is arranged in the fresh air channel, and the fresh air temperature sensor is located between the fresh air inlet and the heat pipe, and the fresh air temperature sensor is electrically connected with the control device.

[0016] The fresh air machine further comprises a return air temperature sensor, the shell is provided with a return air inlet communicated with the return air channel, the return air temperature sensor is arranged in the return air channel, and the return air temperature sensor is located between the return air inlet and the heat pipe, and the return air temperature sensor is electrically connected with the control device.

[0017] The flow rate adjusting mechanism comprises a pump, and the rotation speed of the pump is adjustable.

[0018] A control method of the fresh air machine, comprising:

[0019] Acquiring an outdoor fresh air temperature Tfresh air and an indoor return air temperature Treturn air, and calculating a real-time temperature difference ΔT;

[0020] Matching ΔT with a preset temperature difference;

[0021] Controlling the flow rate adjusting mechanism according to the matching result.

[0022] The preset temperature difference comprises a first preset difference T1, and the method further comprises:

[0023] When ΔT≤T1, controlling the flow rate adjusting mechanism to switch to a closed state;

[0024] When ΔT>T1, controlling the flow rate adjusting mechanism to work to increase the flow rate of the working medium in the heat pipe.

[0025] The first preset difference T1 is in a range of 2℃ to 4℃.

[0026] When △T>T1, the flow rate adjusting mechanism is controlled to work, and the method further comprises:

[0027] The flow rate adjusting mechanism is controlled to make the flow rate of the working medium in the heat pipe proportional to △T.

[0028] The preset temperature difference further comprises a second preset difference T2, a third preset difference T3, a fourth preset difference T4, a fifth preset difference T5 and a sixth preset difference T6, and the gears of the flow rate adjusting mechanism comprise a low gear, a middle-low gear, a middle gear, a middle-high gear, a high gear and an ultra-high gear.

[0029] If T1<△T≤T2, the flow rate adjusting mechanism is controlled to switch to the low gear;

[0030] If T2<△T≤T3, the flow rate adjusting mechanism is controlled to switch to the middle-low gear;

[0031] If T3<△T≤T4, the flow rate adjusting mechanism is controlled to switch to the middle gear;

[0032] If T4<△T≤T5, the flow rate adjusting mechanism is controlled to switch to the middle-high gear;

[0033] If T5<△T≤T6, the flow rate adjusting mechanism is controlled to switch to the high gear;

[0034] If △T>T6, the flow rate adjusting mechanism is controlled to switch to the ultra-high gear.

[0035] The flow rate adjusting mechanism comprises a pump, the rotation speed of the pump is adjustable, and the rotation speed of the pump gradually increases in the order of the low gear, the middle-low gear, the middle gear, the middle-high gear, the high gear and the ultra-high gear.

[0036] The value range of T2 is 4-7℃;

[0037] The value range of T3 is 7-9℃;

[0038] The value range of T4 is 9-11℃;

[0039] The value range of T5 is 11-13℃;

[0040] The value range of T6 is 13-16℃.

[0041] The fresh air machine is applied in an air conditioning system, and the air conditioning system further comprises an indoor unit and an outdoor unit, and after matching △T with the preset temperature difference, the method further comprises:

[0042] determining the energy consumption Pheat pipe consumed by the flow rate adjusting mechanism corresponding to △T;

[0043] determining the heat exchange capacity required by the indoor unit corresponding to △T, and determining the energy consumption Poutdoor consumed by the outdoor unit;

[0044] if Pheat pipe < Poutdoor, the flow rate adjusting mechanism is started, and the working frequency of the outdoor unit is kept unchanged;

[0045] if Pheat pipe ≥ Poutdoor, the flow rate adjusting mechanism is kept stopped, and the working frequency of the outdoor unit is increased.

[0046] An air conditioning system comprising the fresh air machine or applying the control method of the fresh air machine.

[0047] The fresh air machine and the control method thereof and the air conditioning system provided by the application adjust the flow rate of the liquid working medium in the heat pipe by using the flow rate adjusting mechanism, so that the flow of the working medium in the heat pipe is changed from passive to active, the power of the liquid working medium is effectively improved, and the heat exchange capacity of the heat pipe and the energy recovery capacity of the return air are improved, so that the maximum energy saving is realized under the premise of ensuring the indoor comfort, the use experience of the user is improved, and when the fresh air machine is applied to the air conditioning system with the indoor unit and the outdoor unit, the heat exchange capacity of the heat pipe can also be used to reduce the load of the indoor unit, the indoor unit is linked and controlled, the overcooling and overheating of the indoor unit are effectively avoided, the energy consumption of the outdoor unit and the air conditioning system is reduced, and the power waste of the air conditioning system is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 a structural schematic view of the fresh air machine provided by the embodiment of the application;

[0049] Figure 2 a structural schematic view of the heat pipe of the fresh air machine provided by the embodiment of the application;

[0050] Figure 3 a structural schematic view of the heat pipe and the flow rate adjusting mechanism of the fresh air machine provided by the embodiment of the application;

[0051] Figure 4 a structural schematic view of the flow rate adjusting mechanism, the return flow main pipe and the outflow main pipe provided by the embodiment of the application;

[0052] Figure 5 a control flowchart of the fresh air machine provided by the embodiment of the application;

[0053] Figure 6 another control flowchart of the fresh air machine provided by the embodiment of the application;

[0054] In the drawings:

[0055] 1, housing; 11, fresh air passage; 12, return air passage; 2, heat pipe; 3, flow rate adjusting mechanism; 21, first heat exchange part; 22, heat insulation part; 23, second heat exchange part; 211, return flow section; 212, outflow section; 41, return flow main pipe; 42, outflow main pipe; 5, fresh air temperature sensor; 6, return air temperature sensor. DETAILED DESCRIPTION

[0056] In order to make the objects, technical solutions and advantages of the present application clearer, the following further describes the present application with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0057] In order to make the persons skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work should fall within the scope of protection of the present application.

[0058] It should be noted that the terms "first", "second" and the like in the description of the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate or imply a specific order or sequence. It should be understood that the terms thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units need not be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[0059] It should be noted that in the description of the present application, the terms "up", "down", "left", "right", "inner", "outer" and the like indicate the direction or positional relationship of the terms based on the direction or positional relationship shown in the drawings, which is only for the purpose of description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0060] In addition, it needs to be explained that, in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be directly connected, can also be indirectly connected through intermediate medium, and can also be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0061] The heat pipe type fresh air machine in the prior art only relies on the phase change of the liquid working medium inside the heat pipe under the action of pressure difference to exchange heat and recover energy, and has problems of insufficient power of the liquid working medium, low heat exchange efficiency, insufficient energy recovery, and difficulty in guaranteeing indoor comfort, which seriously affects the user's experience. Therefore, the present application provides a fresh air machine as shown in Figures 1 to 6 The heat pipe type fresh air machine in the prior art only relies on the phase change of the liquid working medium inside the heat pipe under the action of pressure difference to exchange heat and recover energy, and has problems of insufficient power of the liquid working medium, low heat exchange efficiency, insufficient energy recovery, and difficulty in guaranteeing indoor comfort, which seriously affects the user's experience. Therefore, the present application provides a fresh air machine as shown in

[0062] The heat pipe type fresh air machine in the prior art only relies on the phase change of the liquid working medium inside the heat pipe under the action of pressure difference to exchange heat and recover energy, and has problems of insufficient power of the liquid working medium, low heat exchange efficiency, insufficient energy recovery, and difficulty in guaranteeing indoor comfort, which seriously affects the user's experience. Therefore, the present application provides a fresh air machine as shown in

[0063] The heat pipe 2 comprises a first heat exchange part 21, an adiabatic part 22 and a second heat exchange part 23, the first heat exchange part 21 and the second heat exchange part 23 are communicated with each other through the adiabatic part 22, the first heat exchange part 21 is located in the fresh air channel 11, the second heat exchange part 23 is located in the return air channel 12, and the flow rate adjusting mechanism 3 is communicated with the first heat exchange part 21. Wherein, the heat pipe 2 flows with heat exchange working medium, when the heat exchange working medium flows into the first heat exchange part 21, the heat exchange working medium can release heat in the first heat exchange part 21 to heat the fresh air, at this time, the heat exchange working medium is condensed into liquid state due to heat release, and when the heat exchange working medium flows into the second heat exchange part 23, the return air can absorb heat of the heat exchange working medium in the second heat exchange part 23 when flowing through the second heat exchange part 23, thereby realizing the effect of recovering the heat of the return air, at this time, the heat exchange working medium is evaporated into gaseous state due to heat absorption, the passive flow of the heat exchange working medium in the heat pipe 2 is realized by using the pressure difference generated by the state change of the heat exchange working medium, and the adiabatic part 22 can avoid the heat transfer between the first heat exchange part 21 and the second heat exchange part 23 through the pipe wall of the heat pipe 2. Since the heat exchange working medium is mostly in liquid state in the first heat exchange part 21, the flow rate adjusting mechanism 3 is communicated with the first heat exchange part 21, the liquid heat exchange working medium in the first heat exchange part 21 is driven by using the flow rate adjusting mechanism 3, thereby improving the ability of the liquid heat exchange working medium to flow to the second heat exchange part 23, and further improving the flow rate of the heat exchange working medium at the second heat exchange part 23, improving the heat exchange capacity of the heat pipe 2 and the energy recovery capacity of the return air, realizing maximum energy saving under the premise of ensuring indoor comfort, and improving the user experience.

[0064] Specifically, the shape of the heat pipe 2 is a pipe similar to a ring shape to ensure the circulation flow of the heat exchange working medium, wherein the first heat exchange part 21 comprises a return flow section 211 and an outflow section 212, the first end of the return flow section 211 is communicated with the second heat exchange part 23 through the adiabatic part 22, the second end of the return flow section 211 is communicated with the first end of the outflow section 212 through the flow rate adjusting mechanism 3, and the second end of the outflow section 212 is communicated with the second heat exchange part 23 through the adiabatic part 22. By arranging the flow rate adjusting mechanism 3 between the return flow section 211 and the outflow section, the flow rate adjusting mechanism can reliably drive the liquid heat exchange working medium in the first heat exchange part 21, ensure the reliable flow rate adjustment of the liquid heat exchange working medium, and further reliably adjust and increase the heat exchange capacity of the heat pipe 2.

[0065] Since the number of heat pipes 2 is at least two, all heat pipes 2 need to be communicated with the flow rate adjusting mechanism 3, in order to simplify the structure of the fresh air machine, and at the same time, to make the heat exchange efficiency of all heat pipes 2 basically the same, the fresh air machine further comprises a backflow main pipe 41 and an outflow main pipe 42, all the backflow sections 211 are communicated with the flow rate adjusting mechanism 3 through the backflow main pipe 41, and all the outflow sections 212 are communicated with the flow rate adjusting mechanism 3 through the outflow main pipe 42. All heat pipes 2 are connected in parallel through the backflow main pipe 41, and all heat pipes 2 are communicated with the flow rate adjusting mechanism 3, one flow rate adjusting mechanism 3 can adjust the flow rate of the heat exchange working medium in all heat pipes 2 at the same time, so that all heat pipes 2 can work synchronously and with the same efficiency, and the heat exchange efficiency of the fresh air machine is ensured. Since all heat pipes 2 are communicated with the flow rate adjusting mechanism 3 at the same time, the liquid working medium between all heat pipes 2 can be mixed and then uniformly distributed, further ensuring that all heat pipes 2 can work synchronously and with the same efficiency, and the heat exchange efficiency of the fresh air machine is ensured.

[0066] As shown in Figure 3 and Figure 4 The backflow main pipe 41 is communicated with all backflow sections 211 through a plurality of backflow branch pipes, wherein the backflow section 211 is a capillary pipe, which ensures the reliable change of gas-liquid two-phase of the heat exchange working medium.

[0067] The outflow main pipe 42 is communicated with all outflow sections 212 through a plurality of outflow branch pipes, wherein the outflow section 212 is a capillary pipe, which ensures the reliable change of gas-liquid two-phase of the heat exchange working medium.

[0068] The first heat exchange part 21 is provided with a fin structure. When the fin structure is used, the heat exchange area is increased from the pipe surface area of the heat pipe 2 to the sum of the pipe surface area and the surface area of the fin structure, which improves the heat transfer capacity between the heat exchange working medium and the gas outside the heat pipe 2, thereby effectively improving the heat exchange efficiency of the heat pipe 2.

[0069] Similarly, the second heat exchange part 23 is provided with a fin structure. When the fin structure is used, the heat exchange area is increased from the pipe surface area of the heat pipe 2 to the sum of the pipe surface area and the surface area of the fin structure, which improves the heat transfer capacity between the heat exchange working medium and the gas outside the heat pipe 2, thereby effectively improving the heat exchange efficiency of the heat pipe 2.

[0070] The shell 1 is further provided with a partition plate, which divides the shell 1 into a fresh air channel 11 and a return air channel 12, and the partition plate is in contact with the heat insulation part 22, thereby realizing reliable sealing of the fresh air channel 11 and the return air channel 12.

[0071] The fresh air machine further comprises a control device capable of acquiring the outdoor fresh air temperature and the indoor return air temperature, and the control device is electrically connected with the flow rate adjusting mechanism 3. The flow rate adjusting mechanism 3 is controlled by the control device, so that the fresh air machine can be automatically adjusted according to the outdoor fresh air temperature and the indoor return air temperature, thereby improving the automatic control level of the fresh air machine and the user experience.

[0072] Specifically, the fresh air machine further comprises a fresh air temperature sensor 5, the shell 1 is provided with a fresh air inlet communicating with the fresh air channel 11, the fresh air temperature sensor 5 is arranged in the fresh air channel 11, and the fresh air temperature sensor 5 is located between the fresh air inlet and the heat pipe 2. The fresh air temperature sensor 5 is electrically connected with the control device. The fresh air temperature sensor 5 detects the temperature of the fresh air entering the fresh air channel 11 from the fresh air inlet, so as to obtain the outdoor fresh air temperature.

[0073] Similarly, the fresh air machine further comprises a return air temperature sensor 6, the shell 1 is provided with a return air inlet communicating with the return air channel 12, the return air temperature sensor 6 is arranged in the return air channel 12, and the return air temperature sensor 6 is located between the return air inlet and the heat pipe 2. The return air temperature sensor 6 is electrically connected with the control device. The return air temperature sensor 6 detects the temperature of the return air entering the return air channel 12 from the return air inlet, so as to obtain the outdoor return air temperature.

[0074] The flow rate adjusting mechanism 3 comprises a pump, and the rotation speed of the pump is adjustable. By adjusting the rotation speed of the pump, the flow rate of the fluid flowing through the pump is controlled, so as to control the flow rate of the liquid heat transfer medium in the heat pipe 2.

[0075] A control method of the fresh air machine, comprising:

[0076] Acquiring the outdoor fresh air temperature Tfresh air and the indoor return air temperature Treturn air, and calculating a real-time temperature difference AT;

[0077] Matching AT with a preset temperature difference, and judging the heat exchange amount required between the current outdoor fresh air temperature and the indoor return air temperature;

[0078] Controlling the flow rate adjusting mechanism 3 according to the matching result, adjusting the flow rate of the heat transfer medium in the heat pipe 2, and then matching the heat exchange capacity of the heat pipe 2 with the required heat exchange amount, so as to realize maximum energy saving under the premise of ensuring indoor comfort, and improve the user experience.

[0079] The preset temperature difference comprises a first preset difference T1, and in the step of controlling the flow rate adjusting mechanism 3 according to the matching result, the following steps are further included:

[0080] When △T≤T1, it indicates that the heat exchange capacity of the automatic flow circulation of the heat exchange medium in the heat pipe 2 can meet the heat exchange capacity of the current △T, and the flow speed adjusting mechanism 3 is controlled to switch to the closed state;

[0081] When △T>T1, the flow speed adjusting mechanism 3 is controlled to work to increase the flow speed of the heat exchange medium in the heat pipe 2.

[0082] The first preset difference T1 is in the range of 2-4°C, preferably 3°C.

[0083] In the working of the flow speed adjusting mechanism 3 when △T>T1, it further includes:

[0084] The flow speed adjusting mechanism 3 is controlled to make the flow speed of the heat exchange medium in the heat pipe 2 be proportional to △T, that is, the greater the value of △T, the higher the heat exchange capacity required, and the higher the flow speed of the heat exchange medium in the heat pipe 2 required. Therefore, the flow speed adjusting mechanism is controlled to be proportional to the flow speed of the heat exchange medium in the heat pipe 2 according to the value of △T, so that the heat exchange capacity of the heat pipe 2 is always matched with the heat exchange capacity required by △T, and the energy recycling rate and user comfort are improved.

[0085] The preset temperature difference further includes a second preset difference T2, a third preset difference T3, a fourth preset difference T4, a fifth preset difference T5 and a sixth preset difference T6, and the gears of the flow speed adjusting mechanism 3 include low gear, medium-low gear, medium gear, medium-high gear, high gear and super-high gear. In the control of the flow speed adjusting mechanism 3 to make the flow speed of the heat exchange medium in the heat pipe 2 be proportional to △T, it further includes:

[0086] If T1<△T≤T2, the flow speed adjusting mechanism 3 is controlled to switch to the low gear;

[0087] If T2<△T≤T3, the flow speed adjusting mechanism 3 is controlled to switch to the medium-low gear;

[0088] If T3<△T≤T4, the flow speed adjusting mechanism 3 is controlled to switch to the medium gear;

[0089] If T4<△T≤T5, the flow speed adjusting mechanism 3 is controlled to switch to the medium-high gear;

[0090] If T5<△T≤T6, the flow speed adjusting mechanism 3 is controlled to switch to the high gear;

[0091] If △T>T6, the flow speed adjusting mechanism 3 is controlled to switch to the super-high gear;

[0092] The flow rate adjusting mechanism 3 comprises a pump, the rotation speed of the pump is adjustable, and the rotation speed of the pump gradually increases in order of low gear, middle-low gear, middle gear, middle-high gear, high gear and super-high gear, that is, the rotation speed of the pump corresponding to the low gear is S1, the rotation speed of the pump corresponding to the middle-low gear is S2, the rotation speed of the pump corresponding to the middle gear is S3, the rotation speed of the pump corresponding to the middle-high gear is S4, the rotation speed of the pump corresponding to the high gear is S5, and the rotation speed of the pump corresponding to the super-high gear is S6, wherein S1<S2<S3<S4<S5<S6.

[0093] The value range of T2 is 4℃ to 7℃, preferably 6℃;

[0094] And / or, the value range of T3 is 7℃ to 9℃, preferably 8℃;

[0095] And / or, the value range of T4 is 9℃ to 11℃, preferably 10℃;

[0096] And / or, the value range of T5 is 11℃ to 13℃, preferably 12℃;

[0097] And / or, the value range of T6 is 13℃ to 16℃, preferably 14℃.

[0098] Embodiment

[0099] After the fresh air machine is started, Tnew air and Treturn air are collected, and AT is calculated, when AT≤3℃, the pump is closed, and the liquid working medium is self-circulated according to the temperature difference; when 3℃<AT≤5℃, the pump is started, and the gear is set to low gear (corresponding to the rotating speed S1), at this time, the corresponding flow rate of the liquid heat exchange medium in the heat pipe 2 is V1, and the heat exchanged and recovered by the fresh air machine is Q1=mhAΔT1; when 5℃<AT≤8℃, the pump gear is adjusted to the low-middle gear (corresponding to the rotating speed S2), at this time, the corresponding flow rate of the liquid heat exchange medium in the heat pipe 2 is increased to V2, and the heat exchanged and recovered by the fresh air machine is Q2=2mhAΔT2. When 8℃<AT≤10℃, the pump gear is adjusted to the middle gear (corresponding to the rotating speed S3), at this time, the corresponding flow rate of the liquid heat exchange medium in the heat pipe 2 is increased to V3, and the heat exchanged and recovered by the fresh air machine is Q3=3mhAΔT3. When 10℃<AT≤12℃, the pump gear is adjusted to the middle-high gear (corresponding to the rotating speed S4), at this time, the corresponding flow rate of the liquid heat exchange medium in the heat pipe 2 is increased to V4, and the heat exchanged and recovered by the fresh air machine is Q4=4mhAΔT4. When 12℃<AT≤14℃, the pump gear is adjusted to the high gear (corresponding to the rotating speed S5), at this time, the corresponding flow rate of the liquid heat exchange medium in the heat pipe 2 is increased to V5, and the heat exchanged and recovered by the fresh air machine is Q5=5mhAΔT5. When AT>14℃, the pump gear is adjusted to the super-high gear (corresponding to the rotating speed S6), at this time, the corresponding flow rate of the liquid heat exchange medium in the heat pipe 2 is increased to V6, and the heat exchanged and recovered by the fresh air machine is Q6=6mhAΔT6. According to the rotating speed of the pump adjusted according to the different temperature difference AT, the flow rate of the liquid heat exchange medium in the heat pipe 2 is changed, the flow of the heat exchange medium is changed from passive to active, the heat exchange capacity of the heat pipe 2 can be effectively improved, the energy in the exhaust air can be maximally recovered, and maximum energy saving is realized.

[0100] Wherein, Q: heat pipe 2 heat exchange quantity; h: heat pipe 2 heat exchange coefficient; A: heat pipe 2 effective heat exchange area; m: power coefficient.

[0101] The fresh air machine is applied to an air conditioning system, and the air conditioning system further comprises an indoor unit and an outdoor unit, and after matching the temperature difference AT with a preset temperature difference, the air conditioning system further comprises:

[0102] The energy consumption Pheat pipe 2 required by the flow rate adjusting mechanism 3 corresponding to AT is determined, in the process of determining Pheat pipe 2, the gear of the pump is determined according to AT, and Pheat pipe 2 can be calculated according to the gear of the pump;

[0103] The heat exchange amount ΔQ required by the indoor unit corresponding to ΔT is obtained, and the energy consumption Pout required by the outdoor unit is determined, wherein the heat exchange amount ΔQ required by the indoor unit corresponding to ΔT can be calculated by the heat difference value, when the flow rate adjusting mechanism 3 is not started, the heat exchange amount of the heat pipe 2 is Qoriginal=hA (Tfresh air-Treturn air), and after the rotation speed of the pump is determined according to ΔT, the heat exchange amount of the heat pipe 2 after the flow rate adjusting mechanism 3 is started is Qpump=amhA (Tfresh air-Treturn air), so that the heat difference value ΔQ=Qpump-Qoriginal can be calculated, and then Pout can be obtained according to the heat exchange amount ΔQ required by the indoor unit.

[0104] If Pheat pipe 2

[0105] If Pheat pipe 2≥Pout, it is indicated that the energy consumption of the flow rate adjusting mechanism 3 is higher than that of the outdoor unit adjustment, so the flow rate adjusting mechanism 3 is kept to stop working, and the working frequency of the outdoor unit is increased, at this time the heat pipe 2 only relies on the temperature difference and pressure difference as the power to carry out the circulating heat exchange, thereby reducing the overall energy consumption of the air conditioning unit.

[0106] An air conditioning system comprising the fresh air machine or the control method of the fresh air machine.

[0107] The above-mentioned embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A control method of a fresh air machine, characterized by: The fresh air machine comprises: a shell (1) in which a fresh air channel (11) and a return air channel (12) are formed; a heat pipe (2) arranged in the shell (1), and part of the heat pipe (2) is located in the fresh air channel (11) and part of the heat pipe (2) is located in the return air channel (12); a flow rate adjusting mechanism (3) in communication with the heat pipe (2), and the flow rate adjusting mechanism (3) can adjust the flow rate of the working medium in the heat pipe (2); The control method comprises: obtaining outdoor fresh air temperature Tfresh air and indoor return air temperature Treturn air, and calculating real-time temperature difference ΔT; matching ΔT with a preset temperature difference; controlling the flow rate adjusting mechanism (3) according to the matching result; The fresh air machine is applied to an air conditioning system, and the air conditioning system further comprises an indoor unit and an outdoor unit, and after matching ΔT with the preset temperature difference, the method further comprises: determining the energy consumption Pheat pipe of the flow rate adjusting mechanism (3) corresponding to ΔT; determining the heat exchange amount of the indoor unit corresponding to ΔT, and determining the energy consumption Poutdoor unit of the outdoor unit; if Pheat pipe < Poutdoor unit, the flow rate adjusting mechanism (3) is started, and the working frequency of the outdoor unit is kept unchanged; if Pheat pipe ≥ Poutdoor unit, the flow rate adjusting mechanism (3) is kept stopped, and the working frequency of the outdoor unit is increased.

2. The control method of the fresh air machine according to claim 1, characterized by: The preset temperature difference comprises a first preset difference T1, and in the step of controlling the flow rate adjusting mechanism (3) according to the matching result, the method further comprises: when ΔT ≤ T1, the flow rate adjusting mechanism (3) is controlled to switch to a closed state; when ΔT > T1, the flow rate adjusting mechanism (3) is controlled to work to increase the flow rate of the working medium in the heat pipe (2).

3. The control method of the fresh air machine according to claim 2, characterized by: The first preset difference T1 ranges from 2°C to 4°C.

4. The control method of the fresh air machine according to claim 2, characterized by: In the step of controlling the flow rate adjusting mechanism (3) to work when ΔT > T1, the method further comprises: controlling the flow rate adjusting mechanism (3) to make the flow rate of the working medium in the heat pipe (2) be proportional to ΔT.

5. The control method of the fresh air machine according to claim 4, characterized by: The preset temperature difference further comprises a second preset difference T2, a third preset difference T3, a fourth preset difference T4, a fifth preset difference T5 and a sixth preset difference T6, and the gears of the flow rate adjusting mechanism (3) comprise low gears, middle-low gears, middle gears, middle-high gears, high gears and super-high gears, and in the step of controlling the flow rate adjusting mechanism (3) to make the flow rate of the working medium in the heat pipe (2) be proportional to ΔT, the method further comprises: if T1 < ΔT ≤ T2, the flow rate adjusting mechanism (3) is controlled to switch to the low gears; if T2 < ΔT ≤ T3, the flow rate adjusting mechanism (3) is controlled to switch to the middle-low gears; if T3 < ΔT ≤ T4, the flow rate adjusting mechanism (3) is controlled to switch to the middle gears; if T4 < ΔT ≤ T5, the flow rate adjusting mechanism (3) is controlled to switch to the middle-high gears; if T5 < ΔT ≤ T6, the flow rate adjusting mechanism (3) is controlled to switch to the high gears; if ΔT > T6, the flow rate adjusting mechanism (3) is controlled to switch to the super-high gears. The flow rate adjusting mechanism (3) comprises a pump, the rotation speed of the pump is adjustable, and the rotation speed of the pump gradually increases in the order of low gear, middle-low gear, middle gear, middle-high gear, high gear and super-high gear.

6. The control method of the fresh air machine according to claim 5, wherein: T2 is in the range of 4-7℃; and / or, T3 is in the range of 7-9℃; and / or, T4 is in the range of 9-11℃; and / or, T5 is in the range of 11-13℃; and / or, T6 is in the range of 13-16℃.

7. A fresh air ventilator to which a control method according to any one of claims 1 to 6 is applied, characterized by: The number of the heat pipes (2) is at least two, all the heat pipes (2) are arranged side by side, and all the heat pipes (2) are communicated with the flow rate adjusting mechanism (3).

8. The fresh air machine of claim 7, wherein: The heat pipe (2) comprises a first heat exchange part (21), an adiabatic part (22) and a second heat exchange part (23), the first heat exchange part (21) and the second heat exchange part (23) are communicated with each other through the adiabatic part (22), the first heat exchange part (21) is located in the fresh air channel (11), the second heat exchange part (23) is located in the return air channel (12), and the flow rate adjusting mechanism (3) is communicated with the first heat exchange part (21).

9. The fresh air machine of claim 8, wherein: The first heat exchange part (21) comprises a return flow section (211) and an outflow section (212), a first end of the return flow section (211) is communicated with the second heat exchange part (23) through the adiabatic part (22), a second end of the return flow section (211) is communicated with a first end of the outflow section (212) through the flow rate adjusting mechanism (3), and a second end of the outflow section (212) is communicated with the second heat exchange part (23) through the adiabatic part (22).

10. The fresh air machine of claim 9, wherein: The fresh air machine further comprises a return flow main pipe (41) and an outflow main pipe (42), all the return flow sections (211) are communicated with the flow rate adjusting mechanism (3) through the return flow main pipe (41), and all the outflow sections (212) are communicated with the flow rate adjusting mechanism (3) through the outflow main pipe (42).

11. The fresh air machine of claim 8, wherein: The first heat exchange part (21) is provided with a fin structure; and / or, the second heat exchange part (23) is provided with a fin structure.

12. The fresh air machine of claim 7, wherein: The fresh air machine further comprises a control device, the control device can acquire an outdoor fresh air temperature and an indoor return air temperature, and the control device is electrically connected with the flow rate adjusting mechanism (3).

13. The fresh air machine of claim 12, wherein: The fresh air machine further comprises a fresh air temperature sensor (5), the shell (1) is provided with a fresh air inlet communicated with the fresh air channel (11), the fresh air temperature sensor (5) is arranged in the fresh air channel (11), the fresh air temperature sensor (5) is located between the fresh air inlet and the heat pipe (2), and the fresh air temperature sensor (5) is electrically connected with the control device.

14. The fresh air machine of claim 12, wherein: The fresh air machine further comprises a return air temperature sensor (6), the shell (1) is provided with a return air inlet communicating with the return air channel (12), the return air temperature sensor (6) is arranged in the return air channel (12), and the return air temperature sensor (6) is located between the return air inlet and the heat pipe (2), and the return air temperature sensor (6) is electrically connected with the control device.

15. The fresh air machine of claim 7, wherein: The flow rate adjusting mechanism (3) comprises a pump, and the rotation speed of the pump is adjustable.

16. An air conditioning system characterized by: The control method of the fresh air machine according to any one of claims 1 to 6 or the fresh air machine comprising any one of claims 7 to 15.

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