A yak heat recovery ventilation system

Abstract

A yak heat recovery ventilation system comprises a ventilation duct assembly (1), a fresh air intake assembly (2), a wind cover (3), a fresh air blower (4), an air supply assembly (6), an exhaust gas exhaust fan (9) and a drainage device (10). One end of the ventilation duct assembly (1) is connected to the fresh air intake assembly (2), the wind cover (3) and the fresh air blower (4). The fresh air blower (4) draws cold fresh air from the outside into the ventilation duct assembly (1). The other end of the ventilation duct assembly (1) passes through the air exchange assembly (7), then passes through the exhaust air intake assembly (8), and is connected to the exhaust gas exhaust fan (9) through the wind cover (3). The exhaust gas exhaust fan (9) draws hot exhaust gas in the cowshed into the ventilation duct assembly (1). The cold fresh air and the hot exhaust gas meet in the ventilation duct assembly (1), heat exchange and recovery are completed through the ventilation duct assembly (1), and condensed water is formed. The beneficial effect is that the airtightness during the gas transportation process can be protected and the occurrence of air leakage can be avoided.

Description

Technical Field

[0001] The present invention relates to the fields of animal husbandry and environmental control, and in particular to a yak heat recovery ventilation system. Background Art

[0002] In yak farming, ventilation is crucial for maintaining a comfortable environment within barns and the health of the yaks. However, ventilation is also a major cause of heat loss in buildings. During the heating period, heat loss due to ventilation can account for up to 50% of a building's total heat loss. This loss not only affects barn temperatures but also increases energy consumption, thereby raising operating costs.

[0003] In order to solve this problem, heat recovery ventilation (HRV) systems were developed and gradually applied to civil, commercial and industrial buildings. This system recovers heat from the exhaust air to preheat the fresh air entering the building, effectively reducing heat energy loss caused by ventilation, improving energy efficiency, and increasing the comfort of the living and working environment. With the development of animal husbandry and the improvement of breeding environment requirements, heat recovery ventilation systems have begun to be used for livestock house ventilation. This not only solves the contradiction between ventilation and heating, but also becomes one of the energy-saving measures, helps to reduce livestock house operating costs, and promotes the sustainable development of animal husbandry.

[0004] While heat recovery ventilation systems theoretically offer significant energy-saving potential, in practice, their efficiency is affected by a variety of factors. Exhaust gas leakage is a major issue contributing to low heat recovery efficiency. Leakage leads to incomplete gas exchange, reducing heat recovery efficiency. Furthermore, condensate in the system can cause equipment to freeze or even burst during cold winters, disrupting normal operation and potentially posing safety risks.

[0005] Therefore, an improved heat recovery ventilation system is needed in the yak breeding process, which can effectively solve the problems caused by exhaust gas leakage and condensation water to ensure the efficient operation of the system and the safe heating of the barn. Summary of the Invention

[0006] The purpose of this application is to provide a yak heat recovery ventilation system to solve the problems of difficulty in collecting condensed water, frequent exhaust gas leakage, and poor sealing of the exchange head during heat recovery and exchange, which makes it easy for exhaust gas and new air to mix.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A yak heat recovery ventilation system comprises a ventilation duct assembly (1), a fresh air intake assembly (2), a hood (3), a fresh air blower (4), an air supply assembly (6), an exhaust gas exhaust fan (9) and a drainage device (10). One end of the ventilation duct assembly (1) is connected to the fresh air intake assembly (2), the hood (3) and the fresh air blower (4). The fresh air blower (4) draws cold fresh air from the outside into the ventilation duct assembly (1). The other end of the ventilation duct assembly (1) passes through the air exchange assembly (7), then passes through the exhaust air intake assembly (8), and is connected to the exhaust gas exhaust fan (9) through the hood (3). The exhaust gas exhaust fan (9) draws hot exhaust gas in the cowshed into the ventilation duct assembly (1). The cold fresh air and the hot exhaust gas meet in the ventilation duct assembly (1), and heat exchange and recovery are completed through the ventilation duct assembly (1), and condensed water is formed. The invention is characterized in that: a ventilation hood (1-1) is provided at the bottom of the ventilation duct assembly (1). The bottom of the fresh air intake assembly (2) is provided with a fresh air assembly water collecting tank (2-4) connected to the ventilation hood (1-1), and the end of the fresh air assembly water collecting tank (2-4) is provided with a condensed water outlet (2-5) directed vertically downward, and the condensed water outlet (2-5) is connected to a drainage device (10) through a water pipe joint (2-6). The drainage device (10) includes a drainage box (10-1), a water inlet pipe (10-3) and a drainage pipe (10-4). The upper portion of the water tank (10-1) is provided with a water inlet (10-2) for adding water to the drainage box (10-1) and for observation. The bottom of the drainage box (10-1) is connected to a drainage pipe (10-4). The end of the drainage pipe (10-4) is a water outlet (10-6). The level of the water outlet (10-6) is between the water inlet pipe (10-3) and the water inlet (10-2), thereby preventing exhaust gas from escaping to the outside through the water outlet (10-6).

[0009] Furthermore, the fresh air intake assembly (2) includes a fresh air intake cover (2-1), and a plurality of rows of joint air ducts (2-2) are provided inside the fresh air intake cover (2-1). The arrangement and number of the joint air ducts (2-2) are the same as those of the ventilation ducts (1-3). The joint air ducts (2-2) include square interfaces (2-2-3) and round tubes (2-2-1). A transition zone (2-2-2) is provided between the square interfaces (2-2-3) and the round tubes (2-2-1). Center lines of the square interfaces (2-2-3), the round tubes (2-2-1) and the transition zone (2-2-2) are on the same straight line. The cross section formed by the plurality of square interfaces (2-2-3) is equal to the cross section of the fresh air intake cover (2-1), thereby blocking the fresh air intake cover (2-1) and preventing the inter-tube exhaust gas in the fresh air intake cover (2-1) from being transported forward.

[0010] Furthermore, the air exchange component (7) comprises an air exchange cover (7-1) and an air exchange head (7-2); the air exchange head (7-2) comprises an exchange head circular tube (7-2-1) and an exchange head square port (7-2-3); an exchange head transition zone (7-2-2) is provided between the exchange head circular tube (7-2-1) and the exchange head square port (7-2-3); a cross section formed by staggered and relative formation of a plurality of exchange head square ports (7-2-3) is equal to the cross section of the air exchange cover (7-1); a cross section formed by the exchange head square ports (7-2-3) on two relatively parallel air exchange heads (7-2) is equal to a square interface (2-2-3); and the center lines of the exchange head circular tubes (7-2-1) of the two air exchange heads (7-2) are on the same straight line; the air exchange heads (7-2) exchange new air and exhaust gas on both sides and enter their respective pipelines.

[0011] Furthermore, the exhaust gas intake assembly (8) comprises a fresh air intake cover (2-1) and a joint air duct (2-2), and exhaust gas outlets (2-3) on both sides of the exhaust gas intake assembly (8) are connected to the side wind covers (11).

[0012] Furthermore, the wind cover (3) comprises a mesh cover transition area (3-2) and a wind cover small head (3-3); a wind cover large head (3-1) is provided between the mesh cover transition area (3-2) and the wind cover small head (3-3); the wind cover small head (3-3) is used to connect to a fresh air blower (4) or an exhaust gas exhaust fan (9); and the mesh cover transition area (3-2) is used to communicate with a fresh air intake assembly (2) or an exhaust gas intake assembly (8).

[0013] Furthermore, the air supply assembly (6) is used to transport new air, and includes a fresh air delivery pipe (6-1) connected to the side wind cover (11). A fresh air delivery branch pipe (6-2) is provided at the end of the fresh air delivery pipe (6-1). An air supply hole (6-3) for outputting new air is provided below the fresh air delivery branch pipe (6-2). Both ends of the fresh air delivery branch pipe (6-2) are closed, thereby facilitating uniform output of new air from the air supply hole (6-3).

[0014] Its beneficial effects are:

[0015] 1. High-efficiency condensate recovery. The drainage device (10) used can efficiently collect condensate generated by the ventilation system, thereby protecting the system from damage and maintaining heat exchange efficiency. At the same time, the unique structure of the drainage device ensures that exhaust gas will not leak through the drainage device, ensuring environmental safety.

[0016] 2. Through the bidirectional design of the air exchange component (7) and the side-by-side combination of the exchange head square ports (7-2-3), the new air and the exhaust gas are effectively prevented from mixing, ensuring that the two enter their respective pipelines, thereby improving the air exchange quality.

[0017] 3. The sealing effect is good. The setting of the joint air duct (2-2) and the exchange head square port (7-2-3) enhances the sealing during the gas transmission process, avoids gas leakage, and ensures the stable operation and safety of the system.

[0018] 4. Placing the center lines of the fresh air intake assembly, exhaust air intake assembly and air exchange assembly in the same straight line can ensure easy installation and ensure that the ventilation system is in the same straight line, ensuring smooth ventilation.

[0019] 5. Achieve efficient energy recovery. Through heat exchange and condensed water collection, the system can effectively recover energy and reduce energy consumption. On the other hand, it strengthens environmental protection, avoids exhaust gas leakage, protects the air quality in the cowshed, and reduces the impact on the external environment. At the same time, it can also enhance system stability. The airtight design protects the gas transmission process, avoids leakage, and ensures the long-term stable operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the ventilation system structure;

[0021] Figure 2 yes Figure 1 Exploded view;

[0022] Figure 3 yes Figure 1 Bottom view of

[0023] Figure 4 yes Figure 3 Exploded view of

[0024] Figure 5 yes Figure 4 Enlarged view of point A in the middle;

[0025] Figure 6 is a structural schematic diagram of the fresh air intake assembly (2);

[0026] Figure 7 is a structural schematic diagram of the air exchange component (7);

[0027] Figure 8 It is a structural schematic diagram of the drainage device (10);

[0028] Figure 9 yes Figure 8 Schematic diagram of direction B;

[0029] Figure 10 It is a structural diagram of the joint air duct (2-2);

[0030] Figure 11 It is a structural diagram of the wind changer (7-2);

[0031] Figure 12It is an axonometric drawing of the wind changer (7-2);

[0032] Figure 13 It is a structural schematic diagram of the wind cover (3);

[0033] Figure 14 It is a schematic diagram of the drainage device (10) discharging water outwards;

[0034] Figure 15 It is a schematic diagram when the water level in the drainage device (10) is lower than the water outlet (10-6).

[0035] 1: Ventilation duct assembly, 2: Fresh air intake assembly, 3: Air hood, 4: Fresh air fan, 5: Exhaust duct, 6: Air supply assembly, 7: Air exchange assembly, 8: Exhaust air intake assembly, 9: Exhaust exhaust fan, 10: Drainage device, 11: Side wind hood, 1-1: Ventilation hood, 1-2: Ventilation hood water collection tank, 1-3: Ventilation pipe, 2-1: Fresh air intake hood, 2-2: Connector air duct, 2-3: Exhaust outlet, 2-4: Fresh air assembly water collection tank, 2-5: Condensate outlet, 2-6: Water pipe connector, 3-1: Ventilation hood head, 3-2 : Mesh cover transition zone, 3-3: Small head of air hood, 6-1: Fresh air delivery pipe, 6-2: Fresh air delivery branch pipe, 6-3: Air supply hole, 7-1: Air exchange hood, 7-2: Air exchange head, 10-1: Drainage box, 10-2: Water inlet, 10-3: Water inlet pipe, 10-4: Drain pipe, 10-5: Cover body, 10-6: Water outlet, 2-2-1: Round pipe, 2-2-2: Transition zone, 2-2-3: Square interface, 7-2-1: Exchange head round pipe, 7-2-2: Exchange head transition zone, 7-2-3: Exchange head square mouth. DETAILED DESCRIPTION

[0036] The following examples and the accompanying drawings further illustrate the specific implementation methods provided by the present invention.

[0037] like Figure 1-5As shown, a yak heat recovery ventilation system mainly comprises a ventilation duct assembly (1), a fresh air intake assembly (2), a wind cover (3), a fresh air blower (4), an air supply assembly (6), an exhaust gas exhaust fan (9) and a drainage device (10), wherein one end of the ventilation duct assembly (1) is connected to the fresh air intake assembly (2), the wind cover (3) and the fresh air blower (4), and the fresh air blower (4) draws cold fresh air from the outside into the ventilation duct assembly (1), and the other end of the ventilation duct assembly (1) passes through the air exchange assembly (7), then passes through the exhaust air intake assembly (8), and is connected to the exhaust gas exhaust fan (9) through the wind cover (3), and the exhaust gas exhaust fan (9) draws hot exhaust gas in the cowshed into the ventilation duct assembly (1), and the cold fresh air and the hot exhaust gas meet in the ventilation duct assembly (1), and heat exchange and recovery are completed through the ventilation duct assembly (1) to form hot fresh air and cold exhaust gas. The exhaust gas intake assembly (8) is connected to the air supply assembly (6) via the side wind hoods (11) on both sides, thereby directing the hot new air to every corner of the cowshed.

[0038] The air supply assembly (6) is used to transport fresh air and includes a fresh air delivery pipe (6-1) connected to the side wind cover (11). A fresh air delivery branch pipe (6-2) is provided at the end of the fresh air delivery pipe (6-1). An air supply hole (6-3) for outputting fresh air is provided below the fresh air delivery branch pipe (6-2). Both ends of the fresh air delivery branch pipe (6-2) are closed, thereby facilitating uniform output of fresh air from the air supply hole (6-3).

[0039] like Figure 5 As shown, the ventilation duct assembly (1) includes a ventilation hood trough (1-2), multiple rows of ventilation pipes (1-3) are arranged inside the ventilation hood trough (1-2), and a ventilation hood (1-1) for collecting condensed water in the ventilation hood trough (1-2) is provided at the bottom of the ventilation hood trough (1-2).

[0040] like Figure 5 and 6 As shown, the fresh air intake assembly (2) includes a fresh air intake hood (2-1), and multiple rows of joint air ducts (2-2) are provided inside the fresh air intake hood (2-1). The arrangement and number of the joint air ducts (2-2) are the same as those of the ventilation ducts (1-3). A fresh air assembly water collecting tank (2-4) connected to the ventilation hood (1-1) is provided at the bottom of the fresh air intake hood (2-1). A condensate outlet (2-5) for discharging water downward is provided at the end of the fresh air assembly water collecting tank (2-4). A water pipe joint (2-6) connected to the drainage device (10) is provided at the lower end of the condensate outlet (2-5). An exhaust outlet (2-3) for discharging exhaust gas is provided on the side of the fresh air intake assembly (2). The exhaust outlet (2-3) is connected to the exhaust duct (5) through the side wind hood (11), and the exhaust gas in the cowshed is discharged to the outside through the exhaust duct (5). As shown Figure 9As shown, the joint air duct (2-2) mainly includes a square interface (2-2-3) and a circular tube (2-2-1). A transition zone (2-2-2) is provided between the square interface (2-2-3) and the circular tube (2-2-1). The center lines of the square interface (2-2-3), the circular tube (2-2-1) and the transition zone (2-2-2) are on the same straight line. The cross section formed by the multiple square interfaces (2-2-3) is equal to the cross section of the fresh air intake hood (2-1), thereby blocking the fresh air intake hood (2-1) and preventing the inter-tube exhaust gas in the fresh air intake hood (2-1) from being transported forward, so that it can only be discharged through the exhaust outlet (2-3). The structure of the exhaust gas intake assembly (8) is similar to that of the fresh air intake assembly (2), including a fresh air intake cover (2-1) and a joint air duct (2-2), but the bottom of the exhaust gas intake assembly (8) does not have a fresh air assembly water collection tank (2-4), and the exhaust gas outlets (2-3) on both sides of the exhaust gas intake assembly (8) are connected to the side wind covers (11).

[0041] like Figure 7 As shown, the air exchange assembly (7) mainly includes an air exchange cover (7-1) and an air exchange head (7-2), wherein the air exchange head (7-2) is as shown in FIG. Figure 10 and 11 As shown, it mainly includes an exchange head circular tube (7-2-1) and an exchange head square port (7-2-3), and an exchange head transition zone (7-2-2) is provided between the exchange head circular tube (7-2-1) and the exchange head square port (7-2-3). The cross section formed by the staggered and relative formation of the plurality of exchange head square openings (7-2-3) is equal to the cross section of the air exchange hood (7-1), wherein the cross section formed by the exchange head square openings (7-2-3) on the two relatively parallel air exchange heads (7-2) is equal to the cross section of a square interface (2-2-3), and the center lines of the exchange head circular tubes (7-2-1) of the two air exchange heads (7-2) are on the same straight line. By sharing the same straight line, it is possible to ensure that the ventilation system as a whole is in a straight line, ensuring smooth ventilation. The design of the air exchange head (7-2) allows the new air and exhaust gas on both sides of the air exchange head (7-2) to enter their respective pipelines, that is, the new air originally in the pipe is transported between the pipes after passing through the air exchange head (7-2), and the exhaust gas originally transported through the exhaust gas intake assembly (8) pipe is exchanged through the air exchange head (7-2) and enters the pipes of the ventilation duct assembly (1).

[0042] like Figure 8As shown, the drainage device (10) is used to discharge condensed water in the ventilation system. Since the ventilation system has an inclination, the end located at the fresh air blower (4) is lower and the end located at the exhaust gas exhaust fan (9) is higher, so that the condensed water passes through the ventilation cover (1-1) and the fresh air component water collection tank (2-4) and finally flows into the drainage device (10). The drainage device (10) includes a drainage box (10-1), a water inlet pipe (10-3) and a drainage pipe (10-4). A water inlet (10-2) is provided at the upper part of the drainage box (10-1) for adding water to the drainage box (10-1) to prevent the drainage box (10-1) from being lower than the inlet of the water inlet pipe (10-3) on the drainage box (10-1). This arrangement can prevent the exhaust gas from being discharged along the water inlet pipe (10-3). A cover (10-5) is provided on the water inlet (10-2) for preventing dust and ash, and a drainage pipe (10-4) is connected to the bottom of the drainage box (10-1), wherein the end of the drainage pipe (10-4) is a water outlet (10-6), and the level of the water outlet (10-6) is higher than the water inlet pipe (10-3). With this arrangement, the water inlet pipe (10-3) can be sealed by condensed water, thereby preventing exhaust gas from leaking out through the drainage device (10). This design is the innovation of the present invention, which can prevent exhaust gas from leaking out and facilitate the collection and discharge of condensed water.

[0043] like Figure 13 As shown, the wind cover (3) comprises a mesh cover transition area (3-2) and a wind cover small head (3-3), a wind cover large head (3-1) is provided between the mesh cover transition area (3-2) and the wind cover small head (3-3), the wind cover small head (3-3) is used to be connected to a fresh air blower (4) or an exhaust gas exhaust fan (9), and the mesh cover transition area (3-2) is used to be connected to a fresh air intake assembly (2) or an exhaust gas intake assembly (8).

[0044] In specific use, such as Figure 2As shown, the conveying path of the new air is as follows: it is drawn into the ventilation system by the fresh air blower (4), enters the joint air duct (2-2) in the fresh air intake assembly (2) through the air hood (3), and then enters the ventilation pipe (1-3) in the ventilation duct assembly (1), and then exchanges heat with the exhaust gas outside the ventilation pipe (1-3) through the ventilation pipe (1-3), thereby converting the cold new air into hot new air. The hot new air passes through the air exchange assembly (7), and is conveyed to the inner pipe of the exhaust air intake assembly (8), and then is connected to the air supply assembly (6) through the side air hoods (11) on both sides of the exhaust air intake assembly (8), and then the hot new air is conveyed to every corner of the cowshed. The exhaust path of the waste gas is as follows: the waste gas enters the pipe inside the waste gas intake assembly (8) through the wind hood (3) from the waste gas exhaust fan (9), and then exchanges to the pipe of the ventilation duct assembly (1) through the air exchange assembly (7). Due to the heat exchange in the waste gas, the temperature gradually decreases, and part of the water vapor in it will become condensed water and condense down. The condensed water is collected through the ventilation hood (1-1) and the fresh air assembly water collection tank (2-4), and the waste gas continues to be transported outward, passes through the fresh air intake assembly (2), and then passes through the side wind hood (11), and finally discharged to the outside through the exhaust duct (5). Figure 14 As shown, when the water level in the drainage box (10-1) is higher than the water outlet (10-6), the condensed water will be discharged from the water outlet (10-6) due to the water pressure. Figure 15 As shown, when the water stored in the drainage device (10) is lower than the water inlet pipe (10-3), waste gas will enter the drainage box (10-1) through the drainage device (10). However, since the level of the water outlet (10-6) is higher than the water inlet pipe (10-3), it can be ensured that the drainage device (10) is sealed due to the pressure of water in the drainage pipe (10-4), preventing waste gas from escaping from the water outlet (10-6). Since the level of the water outlet (10-6) is lower than the ventilation cover (1-1), when there is condensed water, it will be injected into the drainage device (10), and it will not affect the collection of condensed water. As long as there is water in the drainage device (10), waste gas will not be discharged outward through the water outlet (10-6). Through the arrangement of the drainage device (10), it can be avoided that the condensed water is emptied during the discharge process and leaks. At the same time, the water outlet (10-6) can be frozen in the cold winter to prevent poor drainage.

[0045] Although some specific embodiments are given above to illustrate and describe the present invention, it is not intended that the present invention is limited to the various details thereof. On the contrary, various modifications may be made to the various details without departing from the spirit of the present invention within the scope and range equivalent to the claims.

Claims

1. A yak heat recovery ventilation system, comprising a ventilation duct assembly (1), a fresh air intake assembly (2), a wind cover (3), a fresh air blower (4), an air supply assembly (6), an exhaust gas exhaust fan (9) and a drainage device (10), wherein one end of the ventilation duct assembly (1) is connected to the fresh air intake assembly (2), the wind cover (3) and the fresh air blower (4), and the fresh air blower (4) sucks cold fresh air from the outside into the ventilation duct assembly (1), and the other end of the ventilation duct assembly (1) passes through the air exchange assembly (7), then passes through the exhaust air intake assembly (8), and is then connected to the exhaust gas exhaust fan (9) through the wind cover (3), and the exhaust gas exhaust fan (9) sucks hot exhaust gas in the cowshed into the ventilation duct assembly (1), and the cold fresh air and the hot exhaust gas meet in the ventilation duct assembly (1), and heat exchange and recovery are completed through the ventilation duct assembly (1), and condensed water is formed. The system is characterized in that: The bottom of the ventilation duct assembly (1) is provided with a ventilation hood (1-1), the bottom of the fresh air intake assembly (2) is provided with a fresh air assembly water collecting tank (2-4) connected to the ventilation hood (1-1), the end of the fresh air assembly water collecting tank (2-4) is provided with a condensed water outlet (2-5) directed vertically downward, the condensed water outlet (2-5) is connected to a drainage device (10) through a water pipe joint (2-6), and the drainage device (10) includes a drainage A water tank (10-1), a water inlet pipe (10-3) and a drainage pipe (10-4) are provided at the upper part of the drainage tank (10-1). A water inlet (10-2) for adding water to the drainage tank (10-1) and for observation is provided. The bottom of the drainage tank (10-1) is connected to a drainage pipe (10-4). The end of the drainage pipe (10-4) is a water outlet (10-6). The level of the water outlet (10-6) is between the level of the water inlet pipe (10-3) and the level of the drainage pipe (10-4). The water inlet (10-2) is located between the water inlet (10-2), thereby preventing the exhaust gas from escaping to the outside through the water outlet (10-6). The air exchange component (7) includes an air exchange cover (7-1) and an air exchange head (7-2). The air exchange head (7-2) includes an exchange head circular tube (7-2-1) and an exchange head square port (7-2-3). An exchange head transition zone (7-2-2) is provided between the exchange head circular tube (7-2-1) and the exchange head square port (7-2-3). Multiple exchange heads The cross section formed by the staggered and relative square openings (7-2-3) is equal to the cross section of the air exchange cover (7-1); the cross section formed by the exchange head square openings (7-2-3) on the two relatively parallel air exchange heads (7-2) is equal to a square interface (2-2-3); and the center lines of the exchange head circular tubes (7-2-1) of the two air exchange heads (7-2) are on the same straight line. The air exchange heads (7-2) exchange the new air and exhaust gas on both sides and enter the respective pipelines.

2. The yak heat recovery ventilation system according to claim 1, characterized in that: The fresh air intake assembly (2) comprises a fresh air intake cover (2-1), wherein a plurality of rows of joint air ducts (2-2) are arranged inside the fresh air intake cover (2-1), wherein the arrangement and number of the joint air ducts (2-2) are the same as those of the ventilation ducts (1-3), wherein the joint air ducts (2-2) comprise square interfaces (2-2-3) and round tubes (2-2-1), wherein a transition zone (2-2-2) is provided between the square interfaces (2-2-3) and the round tubes (2-2-1), wherein the center lines of the square interfaces (2-2-3), the round tubes (2-2-1) and the transition zone (2-2-2) are on the same straight line, and the cross section formed by the plurality of square interfaces (2-2-3) is equal to the cross section of the fresh air intake cover (2-1), thereby blocking the fresh air intake cover (2-1) and preventing the inter-tube exhaust gas in the fresh air intake cover (2-1) from being transported forward.

3. The yak heat recovery ventilation system according to claim 1, characterized in that: The exhaust gas intake assembly (8) comprises a fresh air intake cover (2-1) and a joint air duct (2-2), and exhaust gas outlets (2-3) on both sides of the exhaust gas intake assembly (8) are connected to the side wind covers (11).

4. The yak heat recovery ventilation system according to claim 1, characterized in that: The wind cover (3) comprises a mesh cover transition area (3-2) and a wind cover small head (3-3); a wind cover large head (3-1) is provided between the mesh cover transition area (3-2) and the wind cover small head (3-3); the wind cover small head (3-3) is used to connect to a fresh air blower (4) or an exhaust gas exhaust fan (9); and the mesh cover transition area (3-2) is used to communicate with a fresh air intake assembly (2) or an exhaust gas intake assembly (8).

5. A yak heat recovery ventilation system according to any one of claims 1 to 4, characterized in that: The air supply assembly (6) is used to transport new air, and includes a new air delivery pipe (6-1) connected to the side wind cover (11). A new air delivery branch pipe (6-2) is provided at the end of the new air delivery pipe (6-1). An air supply hole (6-3) for outputting new air is provided below the new air delivery branch pipe (6-2). Both ends of the new air delivery branch pipe (6-2) are closed, thereby facilitating uniform output of new air from the air supply hole (6-3).

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