A negative pressure dust reduction fresh air system in hatching room

Abstract

The present application discloses a negative pressure dust reduction and fresh air system for a hatching room, comprising a dust reduction system for atomizing and spraying inside the hatching room and an exhaust system for regulating the pressure inside the hatching room, wherein the exhaust system comprises an exhaust fan for driving one or more hatching machines installed in the hatching room to update the air and maintain the pressure in the hatching room, a controller for driving and regulating the speed of the exhaust fan, the controller being connected to a PLC logic editor for editing and setting the control logic of the controller, and a pressure sensor installed in the hatching room for collecting the air pressure in the hatching room and transmitting it to the controller; the present invention can be set according to the negative pressure value of the batch of hatching eggs in the hatching room and the actual demand, and can achieve precise control, and can meet the needs of multiple hatching machines and different batches of hatching to adjust the negative pressure value in the hatching room.

Description

Technical Field

[0001] The invention relates to the technical field of hatching, in particular to the technical field of chicken and duck hatching devices, and specifically to a negative pressure dust reduction fresh air system in a hatching room. Background Art

[0002] With the advancement of science and technology, the market demand for egg-laying poultry meat is increasing. The existing hatching, breeding and sales of egg-laying poultry have been batched, scaled and standardized. In order to hatch poultry more scientifically and efficiently, from traditional lighting and heating to professional incubators, and then from incubators to the current hatching machines. The precise control of temperature by scientific and technological equipment can hatch egg-laying poultry, such as chickens and ducks, with high efficiency and high survival rate.

[0003] However, today, the hatching production of chicks and ducklings should not only consider the hatching efficiency and hatching survival rate, but also try to minimize or eliminate pollution to the environment, which puts higher requirements on the existing hatching equipment and hatching environment. During the entire hatching process, the hatcher needs to be installed in a closed hatching room to ensure a stable temperature to facilitate hatching. Scientific research has shown that a negative pressure environment is more conducive to hatching. The existing method is to directly install a ventilation fan on the wall of the hatching room or hatching room, and use the exhaust function of the ventilation fan to form a negative pressure environment in the hatching room, but this method has obvious disadvantages; for example: when the total power of the ventilation fan is too large, the negative pressure difference will be too large, which may force the hot air in the hatcher to be discharged; if the total power of the ventilation fan is too small, it may cause insufficient negative pressure, insufficient exhaust, and impurities and harmful gases generated during the tray placement process cannot be discharged in time. Therefore, it can be scientifically executed according to the preset negative pressure value to achieve the best hatching state. Summary of the invention

[0004] In order to solve the problems in the prior art that insufficient ventilation will lead to insufficient negative pressure, and at the same time, when hatching in different batches of hatchers, the exhaust gas in the hatching room cannot be discharged in time, making the chicks and ducklings hatched later easy to get sick; if the ventilation is too large and the negative pressure value is too high, it is easy to extract the heat preservation hot air in the hatching machine, causing the environment in the hatching machine to be destroyed, which will extend the incubation period at the least and terminate the incubation at the worst, the present application provides a negative pressure dust reduction fresh air system for the hatching room, which sets a scientific negative pressure value for the fertilized eggs to be hatched through the PLC logic editor, and then collects the actual pressure value in the hatching room in real time through the pressure sensor as the basis for adjusting the output power of the exhaust fan, and realizes closed-loop regulation, so that the actual pressure value in the hatching room always fluctuates around the theoretically set pressure value, so that the entire incubation process is carried out according to the preset conditions, so as to achieve the effect of effective and efficient hatching. The PLC logic editor is an existing product, but adding it to the regulation of the hatching room can achieve unprecedented technical effects. The reason is that: although the temperature, humidity and theoretical optimal negative pressure value of the existing chicken and duck hatching process are existing technologies, and very scientific data can be found in the discussion and research of poultry hatching and breeding, in the actual hatching process, it is impossible to put eggs to be hatched in each hatcher in the hatching room at the same time. There will always be a sequence, that is, when some of the hatchers may have just started to hatch, some have been hatching for two weeks, and some have already fallen into the tray. Therefore, the negative pressure value in the hatching room cannot be generalized. It is precisely because of the uncontrollable actual hatching process that the existing technology adopts the method of isospeed ventilation to provide a negative pressure environment. Although this simplifies the actual operation, it has many disadvantages for actual hatching.

[0005] Since the changes in negative pressure and exhaust ventilation flow rate during the hatching process have obvious rules to follow, that is, the hatcher will only be turned on after the eggs are dropped, and then dust, chicken feathers or duck feathers and other debris will appear, that is to say, it is necessary to increase the flow rate of air exchange during this period. No matter how many hatchers there are in the hatching room, no matter how discrete the hatching time difference of multiple hatchers is, the negative pressure value can be set according to the order and time difference of the eggs to be hatched in the hatcher through the PLC logic editor, so that the entire hatching room can be hatched completely according to the set negative pressure conditions in a complete cycle. And after completing an incubation cycle, the incubation can be cyclically incubated continuously, while ensuring efficient hatching, it will also reduce energy consumption to a minimum, and can achieve low carbon and environmental protection.

[0006] Similarly, the dust reduction system also sets the spraying time and frequency according to the nodes of the set cycle, which can effectively achieve the dust reduction and hair bundling functions, preventing the hair generated during the hatching process from clogging the exhaust system and being discharged into the atmosphere to pollute the environment. Furthermore, in addition to dust reduction and hair bundling, the dust reduction system can also adjust the humidity in the hatching room according to the set spraying time and spraying water volume, which can further optimize the hatching environment.

[0007] In order to achieve the above purpose, the technical solution adopted in this application is:

[0008] A negative pressure dust reduction and fresh air system for a hatching room, comprising a dust reduction system for atomizing and spraying inside the hatching room and an exhaust system for regulating the pressure inside the hatching room, the exhaust system comprising an exhaust fan for driving one or more hatching machines installed in the hatching room to update the air and maintain the pressure in the hatching room, a controller for driving and regulating the speed of the exhaust fan, the controller being connected to a PLC logic editor for editing and setting the control logic of the controller, and a pressure sensor installed in the hatching room for collecting the air pressure in the hatching room and transmitting it to the controller;

[0009] The exhaust passages of any hatcher are interconnected through the exhaust pipe and are connected to the air inlet end of the exhaust fan through the splitter guide, and the splitter guide simultaneously connects the hatching room, the exhaust passage of any hatcher and the air inlet end of the exhaust fan.

[0010] Preferably, the flow splitter guide has a flow channel wall serving as a main flow channel for air circulation, a plurality of guide vanes are circumferentially inclinedly arranged on the flow channel wall, and an angle between the guide vanes and a side of the flow channel wall close to the air inlet end is an acute angle.

[0011] Preferably, the angle between the guide vane and the side of the flow channel wall close to the air inlet end is 25°-45°.

[0012] Preferably, a filter screen is fixedly connected to the flow channel wall, and the filter screen covers the entire outer circumference of the flow channel wall and extends to both ends of the flow channel wall and is respectively connected to the air outlet end and the air inlet end of the flow channel wall.

[0013] Preferably, the dust reduction system includes a spray pipe installed in the hatching room and connected inside and outside. The multiple free ends of the spray pipe located in the hatching room are respectively air-tightly connected to spray heads for atomizing the spray water. The other end of the spray pipe is connected to the bottom of a sealed spray water tank, and the top of the spray water tank is respectively connected to a water supply pipe and an air supply pipe. The air supply pipe is connected to a booster controlled by the controller, and a solenoid valve controlled by the controller is installed on the air supply pipe connecting the booster and the spray water tank.

[0014] Further preferably, a second one-way valve is provided at one end of the spray pipe close to the spray water tank. A first one-way valve is provided on the water supply pipe.

[0015] As a further preferred embodiment, the outer wall of the hatching room is provided with a U-shaped tube connected to the interior of the hatching room, the U-shaped tube is filled with colored liquid, and a pressure difference scale is provided on the U-shaped tube; the effective pressure difference value of the U-shaped tube is greater than the maximum negative pressure value of the hatching room.

[0016] Beneficial effects:

[0017] The present invention can set the negative pressure value according to the batch of incubated eggs in the hatching room and the actual demand, and realize accurate control, and can meet the needs of multiple hatchers, and adjust the negative pressure value in the hatching room for hatching different batches, and the adjustment accuracy is well controlled; the hatcher will not extract hot air in the insulation stage; the hatcher will not overflow and pollute the hatching room in the ventilation stage. The dust reduction system can simultaneously realize the functions of dust reduction, hair bundling and humidity regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 is a temperature and humidity control curve diagram of the incubation process in Example 1;

[0021] Figure 3 is a pressure control curve diagram of the incubation process in Example 1;

[0022] Figure 4 is a longitudinal full-section view of the flow divider guide along the central axis;

[0023] Figure 5 It is a schematic diagram of the air flow in the hatching room by the diversion guide;

[0024] Figure 6 It is a schematic diagram of the air flow in the hatcher by the diverter guide.

[0025] In the figure: 1-booster; 2-solenoid valve; 3-controller; 4-PLC logic editor; 5-first one-way valve; 6-spray water tank; 7-spray pipe; 8-second one-way valve; 9-exhaust fan; 10-diverter guide; 101-guide plate; 102-channel wall; 103-filter; 104-air outlet; 105-air inlet; 11-spray head; 12-hatcher; 13-air inlet; 14-U-tube; 15-pressure sensor; 16-humidity sensor; 17-air supply pipe; 18-exhaust pipe. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of this application, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, if the terms "first", "second", etc. appear in the description of this application, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0030] In addition, if the terms "horizontal" or "vertical" appear in the description of this application, it does not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] Embodiment 1:

[0033] This embodiment is described by taking hatching chicks as an example. Figure 1 and 3 A negative pressure dust reduction and fresh air system for a hatching room is shown, comprising a dust reduction system for atomizing and spraying inside the hatching room and an exhaust system for regulating the pressure inside the hatching room, the exhaust system comprising an exhaust fan 9 for driving three hatching machines 12 installed in the hatching room to update the air and maintain the pressure in the hatching room, in this embodiment, the exhaust fan 9 adopts a centrifugal fan; and a controller 3 for driving and adjusting the speed of the exhaust fan 9, the controller 3 is connected to a PLC logic editor 4 for editing and setting the control logic of the controller 3, and a pressure sensor 15 installed in the hatching room for collecting the air pressure in the hatching room and transmitting it to the controller 3; the exhaust channels of any hatching machine 12 are interconnected through an exhaust pipe 18 and are connected to the air inlet end of the exhaust fan 9 through a diverter guide 10, and the diverter guide 10 simultaneously connects the hatching room, the exhaust channel of any hatching machine 12 and the air inlet end of the exhaust fan 9.

[0034] Working principle: First, the installation of the present invention before actual work is introduced. In this embodiment, the air inlets 13 of the three hatching machines 12 are respectively connected to the outside of the hatching room. The air inlets 13 are closed and opened by the adjustment function of the hatching machine 12. When the hatching machine needs to be incubated in heat preservation, the air inlet 13 is closed and isolated from the outside of the hatching room; when it reaches the late stage of landing, when the chicks peck and hatch, the air inlet 13 is opened, so that the new air inside the hatching machine 12 is connected with the new air outside the hatching room. Under the exhaust action of the exhaust fan 9, the new air outside the hatching room enters the hatching machine 12, so that the air in the hatching machine 12 is renewed.

[0035] Secondly, in the actual hatching process, according to the actual needs of the three hatching machines 12, the following settings are made: Figure 3The negative pressure value shown by the curve f in the middle, the pressure sensor 15 sends the collected pressure data to the controller 3 in real time, and the controller 3 sends a driving instruction to the exhaust fan 9 according to the program logic preset by the PLC logic editor 4. The output power of the exhaust fan 9 is fed back in real time by the pressure sensor 15 to achieve closed-loop control. The actual negative pressure value of the hatching room is shown by the curve e. The limit value of the curve e is the limit condition for the controller 3 to trigger the exhaust fan 9 preset by the PLC logic editor 4, such as Figure 3 As shown by the upper and lower dotted lines, since the incubation process needs to maintain negative pressure throughout, but it does not necessarily have to be an exact point value, the desired effect can be achieved by adjusting the exhaust fan 9 within the set range using the frequency conversion unit in the controller 3. Therefore, the actual curve e will fluctuate up and down between the preset limit values ​​relative to the theoretical setting curve f. The greater the distance between the two limit value dotted lines, the lower the control accuracy, and the smaller the distance, the higher the control accuracy. The effect of using a centrifugal exhaust fan will be significantly better than the existing ventilation fan, because the ventilation fan in the prior art can only provide a large flow of air drive when the air is circulating, but when the hatching room is in a closed and heat-insulating state, the negative pressure value provided by the ventilation fan is very limited. No matter how large the output power of the ventilation fan is, the air can always flow back into the hatching room through the gap between the ventilation fan blades to reduce the negative pressure state.

[0036] When the hatching room is in the incubation and heat preservation state, the air inlet 13 of any hatching machine 12 is in a closed state, and the hatching machine 12 is incubated at a temperature of 37.8°C. At this time, the hatching machine is connected to the inside of the hatching room through the exhaust pipe 18. Since the diverter guide 10 realizes the three-way connection of the exhaust pipe 18, the inside of the hatching room and the exhaust fan 9, when the exhaust fan 9 is working, since the air inlet 13 at the other end of the exhaust pipe 18 is in a closed state, the exhaust fan 9 can only extract the air from the hatching room. At the beginning, since the air pressure inside the hatching room is equal to the external air pressure, the difference △P between the actual negative pressure value and the theoretical negative pressure value is large, the exhaust fan 9 will exhaust with a larger power. When the actual △P gradually approaches and reaches the preset value as the exhaust continues, the output power of the exhaust fan 9 gradually decreases until it is idle to maintain a relatively stable negative pressure value to achieve the expected effect.

[0037] Embodiment 2:

[0038] In order to better reflect the beneficial effects of the present invention over the prior art, based on Example 1, further combined with the appendix of the specification Figure 4-6As shown, the diverter guide 10 has a channel wall 102 serving as the main air flow channel, and a plurality of guide vanes 101 are arranged obliquely on the channel wall 102 in a circumferential direction, and the angle between the guide vane 101 and the side of the channel wall 102 close to the air inlet end 105 is an acute angle. In this embodiment, the angle between the guide vane 101 and the side of the channel wall 102 close to the air inlet end 105 is 25°-45°. The above-mentioned setting of this embodiment needs to be emphasized and explained, and the above-mentioned structure is also one of the important improvement points of the applicant. Based on the fact that the hatcher 12 will include two states of ventilation and heat preservation during the entire incubation process, in order to ensure that the hatcher 12 and the hatching room maintain a negative pressure state, the air inlet end of the exhaust fan 9 must be connected to the exhaust pipe 18 at the same time, that is, connected to the hatcher 12; and it must also be connected to the inside of the hatching room. However, the problem in reality is that if the connection is made directly with a three-way pipe, when the flow rate of the channel formed between the hatching room and the exhaust fan 9 is too large and when the air inlet 13 of the hatching machine 12 is opened for ventilation, the harmful gas generated by the hatching in the hatching machine 12 will directly overflow into the hatching room. Since the hatching room is not ventilated, once the harmful gas enters the hatching room, it takes a long time to diffuse to the air inlet end of the exhaust fan 9 to be discharged. If the flow rate of the channel formed between the hatching room and the exhaust fan 9 is too small, the exhaust fan 9 is likely to directly extract the warm air in the hatching machine 12, causing the hatching environment to be directly destroyed.

[0039] By using the flow divider guide 10 in this embodiment, under the action of the guide plate 101, the gas from the hatcher 12 is always kept flowing along the inclined direction of the guide plate 101, thereby preventing the gas from overflowing into the hatching room. Figure 6 When incubation is in warm condition, the gas flow direction is as follows Figure 5 As shown, no matter what stage it is in, it can be achieved that the negative pressure in the hatching room and the hatching machine 12 is guaranteed, and the ventilation of the hatching machine 12 during the tray landing stage can be met.

[0040] In this embodiment, the flow channel wall 102 is fixedly connected with a filter screen 103, and the filter screen 103 covers the outer circumference of the entire flow channel wall 102 and extends to both ends of the flow channel wall 102 and is respectively connected to the air outlet end 104 and the air inlet end 105 of the flow channel wall 102. The filter screen 103 is used to block the fine fluff in the hatcher from entering the hatching room, so as to prevent the fluff from being sucked into the exhaust fan 9 and affecting the effective air volume of the exhaust fan 9.

[0041] Embodiment 3:

[0042] Based on any of the above embodiments, Figure 1-6As shown, the dust reduction system includes a spray pipe 7 installed in the hatching room and connected inside and outside. The multiple free ends of the spray pipe 7 located in the hatching room are respectively connected to the spray head 11 for atomizing the spray water in an airtight manner. The other end of the spray pipe 7 is connected to the bottom of the spray water tank 6 which is arranged in a sealed manner. The top of the spray water tank 6 is respectively connected to a water supply pipe and an air supply pipe 17. The air supply pipe 17 is connected to a booster 1 controlled by the controller 3. The air supply pipe 17 connected between the booster 1 and the spray water tank 6 is installed with a solenoid valve 2 controlled by the controller 3. A second one-way valve 8 is provided at one end of the spray pipe 7 close to the spray water tank 6. A first one-way valve 5 is provided on the water supply pipe. A U-shaped tube 14 connected to the inside of the hatching room is provided on the outer wall of the hatching room. The U-shaped tube 14 is filled with a colored liquid and a pressure difference scale is provided on the U-shaped tube 14. The effective pressure difference value of the U-shaped tube 14 is greater than the maximum negative pressure value of the hatching room.

[0043] The main function of the dust reduction system is to spray and atomize the dust and fluff in the hatching room, and at the same time, the humidity in the hatching room is adjusted by controlling the spraying amount. The spraying in this embodiment adopts instant on-off pressurization for spraying. The purpose of this setting is to ensure the precise control of the spraying amount and the atomization effect of the spraying. The direct purpose of the pressurization is to greatly improve the atomization state of the spray. In order to adjust and control the humidity inside the hatching room, a humidity sensor 16 that is communicatively connected to the controller 3 can be installed to collect the humidity in the hatching room. The data collected by the humidity sensor 16 is used as the basis for feedback and adjustment of the spraying water volume to achieve the dual functions of dust reduction and humidity regulation. The control principle of humidity is like the negative pressure value control method in Example 1, which belongs to the existing closed-loop control technology and will not be described in detail here. Specifically, Figure 2 As shown, curve a is the actual temperature curve; curve c is the theoretical temperature curve; curve b is the actual humidity curve; and curve d is the theoretical humidity curve.

[0044] Working principle: When the controller 3 presets the spraying mode or the humidity collected by the humidity sensor 16 is lower than the preset humidity, the controller 3 sends an opening signal to the solenoid valve 2, and the booster 1 delivers the high-pressure gas to the spray water tank 6 through the gas supply pipe 17, so that the water in the spray water tank 6 is transported to each spray head 11 through the spray pipe 7 for atomization spraying under the action of the high-pressure gas. When the spray flow rate reaches the preset flow rate, the solenoid valve 2 is closed, and the high-pressure gas stops being injected into the spray water tank 6. At the same time, the controller 3 opens the pressure relief valve installed between the solenoid valve 2 and the spray water tank 6, and the high-pressure gas remaining in the spray water tank 6 can be released instantly. When the high-pressure gas in the spray water tank 6 is released, the pressure in the spray pipe 7 is lost. Under the blocking action of the second one-way valve 8, the spray head 11 can stop spraying instantly, realizing precise flow control. Since the first one-way valve 5 is provided on the water supply pipe, when there is high pressure in the spray water tank 6, the pressure will not be lost through the water supply pipe, and the water source connected to the water supply pipe will not be affected in any way.

[0045] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A negative pressure dust reduction and fresh air system for a hatching room, comprising a dust reduction system for atomizing and spraying inside the hatching room and an exhaust system for regulating the pressure inside the hatching room, characterized in that: The exhaust system comprises an exhaust fan (9) for driving one or more hatching machines (12) installed in the hatching room to renew the air and maintain the pressure in the hatching room, a controller (3) for driving and adjusting the rotation speed of the exhaust fan (9), the controller (3) being connected to a PLC logic editor (4) for editing and setting the control logic of the controller (3), and a pressure sensor (15) installed in the hatching room for collecting the air pressure in the hatching room and transmitting it to the controller (3); the exhaust passages of any hatching machine (12) are interconnected through an exhaust pipe (18) and are connected to the air inlet end of the exhaust fan (9) through a flow divider guide (10), and the flow divider guide (10) is connected to the hatching room, the exhaust passage of any hatching machine (12) and the air inlet end of the exhaust fan (9) at the same time; The flow splitting guide (10) has a flow channel wall (102) serving as a main flow channel for air circulation, a plurality of guide vanes (101) are circumferentially inclinedly arranged on the flow channel wall (102), and an angle between the guide vanes (101) and a side of the flow channel wall (102) close to an air inlet end (105) is an acute angle; The flow channel wall (102) is fixedly connected with a filter screen (103), the filter screen (103) covers the entire outer circumference of the flow channel wall (102) and extends to both ends of the flow channel wall (102) and is respectively connected to an air outlet end (104) and an air inlet end (105) of the flow channel wall (102); The dust reduction system comprises a spray pipe (7) installed in a hatching room and connected to the inside and outside. The plurality of free ends of the spray pipe (7) located in the hatching room are respectively connected in an airtight manner to a spray head (11) for atomizing spray water. The other end of the spray pipe (7) is connected to the bottom of a sealed spray water tank (6). The top of the spray water tank (6) is respectively connected to a water supply pipe and an air supply pipe (17). The air supply pipe (17) is connected to a booster (1) controlled by the controller (3). A solenoid valve (2) controlled by the controller (3) is installed on the air supply pipe (17) connecting the booster (1) and the spray water tank (6).

2. A negative pressure dust reduction fresh air system in a hatching room according to claim 1, characterized in that: The included angle between the guide plate (101) and the side of the flow channel wall (102) close to the air inlet end (105) is 25°-45°.

3. A negative pressure dust reduction fresh air system in a hatching room according to claim 1, characterized in that: A second one-way valve (8) is provided at one end of the spray pipe (7) close to the spray water tank (6).

4. A negative pressure dust reduction fresh air system in a hatching room according to claim 3, characterized in that: The water supply pipe is provided with a first one-way valve (5).

5. A negative pressure dust reduction fresh air system for hatching room according to any one of claims 1, 3-4, characterized in that: The outer wall of the hatching room is provided with a U-shaped tube (14) which is in communication with the interior of the hatching room. The U-shaped tube (14) contains a colored liquid and a pressure difference scale is provided on the U-shaped tube (14). The effective pressure difference value of the U-shaped tube (14) is greater than the maximum negative pressure value of the hatching room.

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