Heat recovery reheating coil pipe of fresh air ventilator

Abstract

The invention relates to the technical field of fresh air equipment, and discloses a heat recovery reheating coil of a fresh air ventilator, which comprises a reheating mechanism, and a heat recovery mechanism is arranged on the right side of the reheating mechanism. When the heat recovery reheating coil pipe of the fresh air machine is used, the characteristics of efficient heat recovery and flexible air control are shown, fresh air enters a heat exchange core body of a second shell through a first impeller driven by a second motor, heat exchange is conducted between the fresh air and old air, primary heating is achieved, and then the fresh air enters a first shell through a fresh air conveying pipe; in summer, outdoor hot air encounters cold water, water drops can be condensed in the heating pipe, a first motor drives a lead screw to drive a sliding block and a water scraping block to scrape water stains, the heating pipe is prevented from rusting, in addition, an inflating pump inflates an air bag through an inflating pipe, the flow of a fresh air conveying pipe and the flow of an old air conveying pipe can be flexibly controlled, and therefore the fresh air conveying pipe and the old air conveying pipe can be controlled. Different requirements of users are met, dynamic adjustment of the fresh air flow and the exhaust air flow is achieved, and the energy efficiency of the system and the user experience are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fresh air equipment, and particularly to a heat recovery and reheating coil of a fresh air fan. Background Art

[0002] The heat recovery and reheating coil of a fresh air fan plays a crucial role in improving the economy of the air conditioning system and promoting energy conservation. In the overall air conditioning load composition of a building, the fresh air load often accounts for a relatively large proportion. To effectively address this challenge, the use of exhaust air heat recovery technology has become an efficient solution. This technology can cleverly utilize the remaining cold or heat contained in the exhaust air to pre-treat the fresh air, thereby significantly reducing the cooling energy required for directly treating the fresh air and effectively reducing the operating load of the air conditioning unit. This approach not only helps to improve energy utilization efficiency but also lays a solid foundation for the green and sustainable development of the building.

[0003] In the existing ventilation systems, in order to achieve precise control of the flow rates of the fresh air introduced from the outside and the air to be discharged indoors, complex mechanical adjustment devices or electronic control systems are usually relied upon. However, these systems are often costly and complex to maintain, and are not economically practical for many ordinary users or small buildings. Therefore, there is an urgent need for a heat recovery and reheating coil of a fresh air fan. Summary of the Invention

[0004] The purpose of the present invention is to provide a heat recovery and reheating coil of a fresh air fan to solve the problems raised in the above background art.

[0005] To solve the above technical problems, the present invention provides the following technical solution: A heat recovery and reheating coil of a fresh air fan, including a reheating mechanism, and a heat recovery mechanism is arranged on the right side of the reheating mechanism;

[0006] The reheating mechanism includes a housing one. An inlet is arranged on the front side of the housing one, the inlet is communicated with a heating pipe, an outlet is arranged on the rear side of the housing one, a fresh air outlet is opened on the left side of the housing one, a first motor is fixedly connected to the front side of the housing one, a lead screw is fixedly connected to the output end of the first motor, a slider is threadedly connected to the surface of the lead screw, and a slide bar is fixedly connected to the inner wall of the housing one;

[0007] The heat recovery mechanism includes a housing two. An old air conveying pipe is fixedly connected to the left side of the housing two, a fresh air conveying pipe is also fixedly connected to the left side of the housing two, a housing three is fixedly connected to the surface of the fresh air conveying pipe, a support frame three is fixedly connected to the inner wall of the housing three, an air pump is fixedly connected to the top end of the support frame three, an air injection pipe is fixedly connected to the output end of the air pump, one end of the air injection pipe far from the air pump penetrates through the fresh air conveying pipe, and an air bag is fixedly connected to the surface of the air pump.

[0008] Both ends of the lead screw are rotatably connected to the inner wall of the first housing, and the inner wall of the slider is slidably connected to the slide bar.

[0009] Both ends of the heating pipe are fixedly connected to the inner wall of the first housing, and one end of the heating pipe far from the water inlet communicates with the water outlet.

[0010] A limiting frame is fixedly connected to the inner wall of the second housing. A heat exchange core is clamped in the inner wall of the limiting frame. A first support frame is fixedly connected to the inner wall of the second housing. A second motor is fixedly connected to the left side of the first support frame. The output end of the second motor penetrates through the first support frame and is fixedly connected to a first impeller. A second support frame is also fixedly connected to the inner wall of the second housing. A third motor is fixedly connected to the right side of the second support frame. The output end of the third motor penetrates through the second support frame and is fixedly connected to a second impeller.

[0011] A fresh air inlet is fixedly connected to the right side of the second housing. An air outlet is also fixedly connected to the right side of the second housing.

[0012] The first impeller is located at the connection of the fresh air inlet, and the second impeller is located at the connection of the old air conveying pipe.

[0013] The surface of the air pump far from the air injection pipe is fixedly connected to the inner wall of the third housing.

[0014] There are two third housings, and the two third housings are respectively arranged on the surfaces of the fresh air conveying pipe and the old air conveying pipe. The same air pump is arranged inside each of the two third housings.

[0015] A water scraping block is fixedly connected to the side of the slider close to the heating pipe. The right side of the first housing is fixedly connected to the fresh air conveying pipe.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0017] First, when the present invention is in use, fresh air enters the heat exchange core in the second housing from the fresh air inlet driven by the second motor, and old air enters the heat exchange core in the second housing from the old air conveying pipe driven by the third motor. The old air itself has heat, which is transferred to the fresh air through the heat exchange core to achieve the first round of heating. Then the fresh air enters the first housing through the fresh air conveying pipe. The heating pipe in the first housing injects hot water through the water inlet and transfers the heat to the fresh air to achieve secondary heating. The hot water is discharged through the water outlet. The fresh air enters the room through the fresh air outlet, and the old air is discharged to the outside through the air outlet, realizing the heat recovery of the old air and reheating the fresh air.

[0018] Second, when the present invention is used in summer, the outdoor hot air will condense into water droplets and adhere to the surface of the heating pipe when it encounters the cold water-penetrating heating pipe. The first motor drives the lead screw to rotate, driving the slider to slide on the slide bar. The water scraping block fixedly connected to the surface of the slider scrapes the water stains on the surface of the heating pipe, preventing the heating pipe from rusting after long-term use and increasing the service life of the device.

[0019] Third, when the present invention is in use, the air pump pumps air, and the air supply pipe conveys the gas into the airbag. The air flow in the fresh air delivery pipe and the old air delivery pipe can be limited by controlling the gas filling degree of the airbag. According to the user's needs, the inflation amount of the airbag can be adjusted, thereby changing the flow rates of the fresh air and the exhaust air. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 is a schematic diagram of the internal structure of the second housing of the present invention;

[0022] Figure 3 is a schematic diagram of the internal structure of the third housing of the present invention;

[0023] Figure 4 is a schematic diagram of the structure of the first housing of the present invention;

[0024] Figure 5 is a schematic diagram of a partial structure of the present invention;

[0025] Figure 6 is a schematic diagram of the flow-limiting structure of the present invention;

[0026] Figure 7 is a schematic diagram of the partial structure disassembly of the present invention.

[0027] Wherein: 1. Reheating mechanism; 10. First housing; 1001. Water inlet; 1002. Water outlet; 1003. Fresh air outlet; 1004. Heating pipe; 1005. First motor; 1006. Lead screw; 1007. Slide bar; 1008. Slider; 1009. Water scraping block; 2. Heat recovery mechanism; 20. Second housing; 2001. Fresh air inlet; 2002. Air outlet; 2003. Limiting frame; 2004. Heat exchange core; 2005. First support frame; 2006. Second motor; 2007. First impeller; 2008. Second support frame; 2009. Third motor; 2010. Second impeller; 2011. Fresh air delivery pipe; 2012. Old air delivery pipe; 2013. Third housing; 2014. Third support frame; 2015. Air pump; 2016. Air supply pipe; 2017. Airbag. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] The present invention provides the following technical solutions:

[0030] Please refer to Figures 1-7 , a heat recovery and reheating coil of a fresh air fan, including a reheating mechanism 1, and a heat recovery mechanism 2 is arranged on the right side of the reheating mechanism 1;

[0031] The reheating mechanism 1 includes an outer shell 10. An inlet 1001 is arranged on the front side of the outer shell 10. The inlet 1001 is communicated with a heating pipe 1004. An outlet 1002 is arranged on the rear side of the outer shell 10. A fresh air outlet 1003 is opened on the left side of the outer shell 10. A first motor 1005 is fixedly connected to the front side of the outer shell 10. The output end of the first motor 1005 is fixedly connected to a lead screw 1006. A slider 1008 is threadedly connected to the surface of the lead screw 1006. A slide bar 1007 is fixedly connected to the inner wall of the outer shell 10.

[0032] Through the above technical solution, the reheating mechanism 1 is mainly composed of the outer shell 10. Hot water is introduced into the heating pipe 1004 through the inlet 1001 inside it to preheat or heat the fresh air. The heated hot water is discharged from the outlet 1002. After the fresh air is heated, it is sent into the room through the fresh air outlet 1003. In addition, a first motor 1005 is installed on the outer shell 10. Its output end is connected to the lead screw 1006. A slider 1008 is threadedly connected to the lead screw 1006. At the same time, a slide bar 1007 is fixed on the inner wall of the outer shell 10 to support the smooth movement of the slider 1008. This design is used to realize auxiliary functions such as water scraping, enhancing the maintainability and service life of the equipment.

[0033] Both ends of the lead screw 1006 are rotatably connected to the inner wall of the outer shell 10, and the inner wall of the slider 1008 is slidably connected to the slide bar 1007.

[0034] Through the above technical solution, both ends of the lead screw 1006 are rotatably connected to the inner wall of the outer shell 10, ensuring that the lead screw 1006 can rotate stably and smoothly; while the inner wall of the slider 1008 is slidably connected to the slide bar 1007, which ensures that the slider 1008 can move smoothly on the slide bar 1007. Such a design not only improves the stability and reliability of the entire mechanism, but also provides an accurate movement trajectory for the slider 1008 and the connected water scraping block 1009 and other components, so as to effectively perform maintenance tasks such as scraping the water stains on the surface of the heating pipe 1004.

[0035] Both ends of the heating pipe 1004 are fixedly connected to the inner wall of the first housing 10, and one end of the heating pipe 1004 far from the water inlet 1001 is communicated with the water outlet 1002.

[0036] Through the above technical solution, both ends of the heating pipe 1004 are firmly fixed on the inner wall of the first housing 10, ensuring the stable installation of the heating pipe 1004. Among them, one end of the heating pipe 1004 close to the water inlet 1001 receives hot water from the water inlet 1001, and the end far from the water inlet 1001 is connected to the water outlet 1002, forming a complete hot water circulation path. Such a layout design not only optimizes the flow efficiency of hot water but also ensures that the fresh air can fully contact the heating pipe 1004 to achieve efficient heat transfer, thus meeting the indoor demand for warm fresh air.

[0037] A wiper block 1009 is fixedly connected to one side of the slider 1008 close to the heating pipe 1004, and the right side of the first housing 10 is fixedly connected to the fresh air delivery pipe 2011.

[0038] Through the above technical solution, a wiper block 1009 is fixedly connected to one side of the slider 1008 close to the heating pipe 1004. This design enables the wiper block 1009 to closely fit the surface of the heating pipe 1004 when the slider 1008 moves along the slide bar 1007 driven by the lead screw 1006, effectively scraping off the accumulated water stains, preventing the heating pipe 1004 from rusting and extending the service life of the equipment. At the same time, the right side of the first housing 10 is fixedly connected to the fresh air delivery pipe 2011, ensuring that the heated fresh air can smoothly enter the room, providing a warm and comfortable environment for users.

[0039] Embodiment 2

[0040] Please refer to Figures 1-7 , a heat recovery and reheating coil of a fresh air blower. The heat recovery mechanism 2 includes a second housing 20. The left side of the second housing 20 is fixedly connected to an old air delivery pipe 2012, and the left side of the second housing 20 is also fixedly connected to a fresh air delivery pipe 2011. The surface of the fresh air delivery pipe 2011 is fixedly connected to a third housing 2013. The inner wall of the third housing 2013 is fixedly connected to a support frame three 2014. The top of the support frame three 2014 is fixedly connected to an air pump 2015. The output end of the air pump 2015 is fixedly connected to an air injection pipe 2016. One end of the air injection pipe 2016 far from the air pump 2015 penetrates the fresh air delivery pipe 2011, and the surface of the air pump 2015 is fixedly connected to an airbag 2017.

[0041] Through the above technical solution, the heat recovery mechanism 2 integrates the old air delivery pipe 2012 and the fresh air delivery pipe 2011 through the outer shell two 20. An air pump 2015 and a support structure are installed inside the outer shell three 2013 attached to the outside of the fresh air delivery pipe 2011. The air pump 2015 inflates the fresh air delivery pipe 2011 or the air bag 2017 connected thereto through the air delivery pipe 2016, thereby adjusting the fresh air flow rate and achieving flexible air control and energy efficiency optimization of the system.

[0042] The surface of the end of the air pump 2015 away from the air delivery pipe 2016 is fixedly connected to the inner wall of the outer shell three 2013.

[0043] There are two outer shells three 2013, which are respectively arranged on the surfaces of the fresh air delivery pipe 2011 and the old air delivery pipe 2012. The same air pump 2015 is arranged inside both of the two outer shells three 2013.

[0044] Through the above technical solution, the outer shell three 2013 is designed as two independent units, which are respectively installed on the surfaces of the fresh air delivery pipe 2011 and the old air delivery pipe 2012. The same air pump 2015 is equipped inside both of the two outer shells three 2013, and is connected to the air bag 2017 through the respective air delivery pipes 2016, so that the flow rates of the fresh air and the old air can be independently adjusted, enhancing the air control ability and the flexibility of energy efficiency management of the system.

[0045] Embodiment III

[0046] Please refer to Figures 1-7 , a heat recovery and reheating coil of a fresh air fan. A limiting frame 2003 is fixedly connected to the inner wall of the outer shell two 20. A heat exchange core 2004 is clamped inside the inner wall of the limiting frame 2003. A support frame one 2005 is fixedly connected to the inner wall of the outer shell two 20. A second motor 2006 is fixedly connected to the left side of the support frame one 2005. The output end of the second motor 2006 penetrates through the support frame one 2005 and is fixedly connected to an impeller one 2007. A support frame two 2008 is also fixedly connected to the inner wall of the outer shell two 20. A third motor 2009 is fixedly connected to the right side of the support frame two 2008. The output end of the third motor 2009 penetrates through the support frame two 2008 and is fixedly connected to an impeller two 2010.

[0047] Through the above technical solution, the internal structure of the shell 20 is exquisitely designed, the limit frame 2003 firmly fixes the heat exchange core 2004 to ensure the efficiency and stability of the heat exchange process, and the second motor 2006 on the support frame 2005 drives the impeller 2007 to rotate, effectively introducing fresh air into the heat exchange core 2004; at the same time, the third motor 2009 on the support frame 2008 drives the impeller 2 2010 to rotate, smoothly introducing the old air into the heat exchange core 2004 for heat exchange. This layout not only optimizes the flow path of the fresh air and the old air, but also improves the heat recovery efficiency and realizes the maximum utilization of energy.

[0048] A fresh air inlet 2001 is fixedly connected to the right side of the outer shell 20 , and an air outlet 2002 is also fixedly connected to the right side of the outer shell 20 .

[0049] Through the above technical solution, the right side of the outer shell 20 is cleverly designed with a fresh air inlet 2001 and an air outlet 2002. The fresh air inlet 2001 serves as a portal for fresh air to enter the system, ensuring that outdoor fresh air can be smoothly introduced and participate in the heat exchange process; while the air outlet 2002 is responsible for discharging the old air that has completed the heat exchange to the outside, realizing the circulation and renewal of indoor air and the recycling of heat energy, effectively improving the comfort level and energy utilization efficiency of the indoor environment.

[0050] Impeller 1 2007 is located at the connection of the fresh air inlet 2001 , and impeller 2 2010 is located at the connection of the old air delivery pipe 2012 .

[0051] Through the above technical solution, impeller 1 2007 is precisely located at the connection of the fresh air inlet 2001, and its rotation effectively draws the outdoor fresh air into the interior of the shell 2 20, providing the necessary air flow for the heat exchange process. At the same time, impeller 2 2010 is cleverly set at the connection of the old air conveying pipe 2012, and through its rotational power, it smoothly introduces the indoor old air into the heat exchange core 2004, thereby realizing efficient heat exchange between the fresh air and the old air in the heat exchange core 2004, further improving the heat recovery efficiency of the system and the indoor air quality.

[0052] During use, the fresh air system is activated. The second motor 2006 drives the impeller one 2007 to rotate, thereby guiding fresh air to smoothly enter the heat exchange core 2004 inside the outer shell two 20 from the fresh air inlet 2001. At the same time, the third motor 2009 is also activated, driving the impeller two 2010 to rotate, so that the stale air is sucked into the heat exchange core 2004 of the outer shell two 20 through the stale air delivery pipe 2012. Since the stale air has circulated in the room for some time and has a certain amount of heat, this heat is effectively transferred to the fresh air in the heat exchange core 2004, achieving the first round of preheating or heating of the fresh air. The preheated fresh air is then sent into the outer shell one 10 through the fresh air delivery pipe 2011. In the outer shell one 10, the heating pipe 1004 plays a key role. Hot water is injected into the heating pipe 1004 through the water inlet 1001. The hot water flows in the heating pipe 1004 and transfers heat to the passing fresh air, achieving the secondary heating of the fresh air. After the heating is completed, the hot water is discharged from the system through the water outlet 1002. Finally, the fresh air that has undergone two rounds of heating is sent into the room through the fresh air outlet 1003, providing warm and comfortable fresh air for the room. After completing the heat exchange task, the stale air is discharged to the outside through the air outlet 2002, thereby effectively recovering the heat of the stale air and making full use of this heat to heat the fresh air, improving the energy efficiency and environmental protection performance of the entire fresh air system. And when used in summer, due to the relatively high outdoor temperature, hot air is introduced into the fresh air system. When this hot air encounters the heating pipe 1004 with cold water running through it in the outer shell one 10, due to the temperature difference effect, the water vapor in the air will condense into water droplets on the surface of the heating pipe 1004. If these water droplets stay for a long time, it will not only affect the heat exchange efficiency of the heating pipe 1004, but also may cause the surface of the heating pipe 1004 to rust, shortening the service life of the device. To solve this problem, the present invention ingeniously designs a water scraping mechanism. Specifically, when it is necessary to clean the water stains on the surface of the heating pipe 1004, the first motor 1005 is activated, driving the lead screw 1006 to rotate. The rotation of the lead screw 1006 further drives the slider 1008 threadedly connected to it to slide on the slide bar 1007. A water scraping block 1009 is fixedly connected to the surface of the slider 1008. As the slider 1008 moves, the water scraping block 1009 will closely fit the surface of the heating pipe 1004 and effectively scrape the water stains on it. This design not only avoids the problem of rusting of the heating pipe 1004 due to long-term water accumulation, but also ensures the heat exchange efficiency of the heating pipe 1004, thereby extending the service life of the entire fresh air system device and improving the stability and reliability of the system;

[0053] In addition, when using this fresh air system, the air pump 2015 plays a crucial role. It continuously pumps air, precisely delivering the gas through the air injection pipe 2016 into the interior of the airbag 2017. This mechanism allows us to achieve flow restriction of the fresh air delivery pipe 2011 and the stale air delivery pipe 2012 by finely controlling the gas filling level of the airbag 2017. Specifically, according to the actual needs of the user, we can flexibly adjust the inflation volume of the airbag 2017. When it is necessary to increase the fresh air flow, appropriately increase the inflation volume of the airbag 2017 to weaken its flow-limiting effect on the fresh air delivery pipe 2011; conversely, when it is necessary to reduce the fresh air flow or increase the exhaust air volume, reduce the inflation volume of the airbag 2017 to strengthen the flow restriction of the fresh air delivery pipe 2011 and possibly adjust the flow of the stale air delivery pipe 2012 accordingly. This dynamic adjustment method ensures that the fresh air and exhaust air flows can precisely match the actual needs of the user, improving both the flexibility of the system and the indoor air quality and energy utilization efficiency.

[0054] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. The heat recovery and reheating coil of a fresh air unit, comprising a reheating mechanism (1), characterized in that: A heat recovery mechanism (2) is arranged on the right side of the reheating mechanism (1); The reheating mechanism (1) includes a first housing (10). A water inlet (1001) is arranged on the front side of the first housing (10). The water inlet (1001) is communicated with a heating pipe (1004). A water outlet (1002) is arranged on the rear side of the first housing (10). A fresh air outlet (1003) is formed on the left side of the first housing (10). A first motor (1005) is fixedly connected to the front side of the first housing (10). The output end of the first motor (1005) is fixedly connected to a lead screw (1006). A slider (1008) is threadedly connected to the surface of the lead screw (1006). A slide bar (1007) is fixedly connected to the inner wall of the first housing (10); The heat recovery mechanism (2) includes a second housing (20). An old air delivery pipe (2012) is fixedly connected to the left side of the second housing (20). A fresh air delivery pipe (2011) is also fixedly connected to the left side of the second housing (20). A third housing (2013) is fixedly connected to the surface of the fresh air delivery pipe (2011). A support frame three (2014) is fixedly connected to the inner wall of the third housing (2013). An air pump (2015) is fixedly connected to the top end of the support frame three (2014). The output end of the air pump (2015) is fixedly connected to an air delivery pipe (2016). One end of the air delivery pipe (2016) far from the air pump (2015) penetrates through the fresh air delivery pipe (2011). An air bag (2017) is fixedly connected to the surface of the air pump (2015).

2. The heat recovery and reheating coil of a fresh air unit according to claim 1, characterized in that: Both ends of the lead screw (1006) are rotatably connected to the inner wall of the first housing (10). The inner wall of the slider (1008) is slidably connected to the slide bar (1007).

3. The heat recovery and reheating coil of a fresh air unit according to claim 1, characterized in that: Both ends of the heating pipe (1004) are fixedly connected to the inner wall of the first housing (10). One end of the heating pipe (1004) far from the water inlet (1001) is communicated with the water outlet (1002).

4. The heat recovery and reheating coil of a fresh air unit according to claim 1, characterized in that: A limiting frame (2003) is fixedly connected to the inner wall of the second housing (20). A heat exchange core (2004) is clamped in the inner wall of the limiting frame (2003). A support frame one (2005) is fixedly connected to the inner wall of the second housing (20). A second motor (2006) is fixedly connected to the left side of the support frame one (2005). The output end of the second motor (2006) penetrates through the support frame one (2005) and is fixedly connected to an impeller one (2007). A support frame two (2008) is also fixedly connected to the inner wall of the second housing (20). A third motor (2009) is fixedly connected to the right side of the support frame two (2008). The output end of the third motor (2009) penetrates through the support frame two (2008) and is fixedly connected to an impeller two (2010).

5. The heat recovery reheating coil of a fresh air unit according to claim 1, characterized in that: A fresh air inlet (2001) is fixedly connected to the right side of the second housing (20). An air outlet (2002) is also fixedly connected to the right side of the second housing (20).

6. The heat recovery reheating coil of a fresh air unit according to claim 4, characterized in that: The impeller one (2007) is located at the connection of the fresh air inlet (2001), and the impeller two (2010) is located at the connection of the old air conveying pipe (2012).

7. The heat recovery reheating coil of a fresh air unit according to claim 1, characterized in that: The surface of the air pump (2015) at the end far from the air injection pipe (2016) is fixedly connected to the inner wall of the outer shell three (2013).

8. The heat recovery and reheating coil of a fresh air unit according to claim 1, characterized in that: There are two outer shells three (2013), and the two outer shells three (2013) are respectively arranged on the surfaces of the fresh air conveying pipe (2011) and the old air conveying pipe (2012), and the same air pump (2015) is arranged inside each of the two outer shells three (2013).

9. The heat recovery reheating coil of a fresh air unit according to claim 1, characterized in that: A wiper block (1009) is fixedly connected to the side of the slider (1008) close to the heating pipe (1004), and the right side of the outer shell one (10) is fixedly connected to the fresh air conveying pipe (2011).

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