Ventilation equipment capable of controlling ventilation quantity

Abstract

The ventilation equipment comprises a shell, the bottom of the side face of the shell communicates with a first air inlet pipe, the input end of the first air inlet pipe is fixedly provided with a first filter screen, the top of the side face of the shell is further provided with a cleaning mechanism used for cleaning the first filter screen, and the shell is internally provided with an air control mechanism used for adjusting the air volume. A cleaning mechanism used for cleaning the inner wall of the first air inlet pipe is arranged below the air control mechanism. The extending end of an electric push rod is controlled to extend to a half length, a shielding cover is separated from a first air inlet pipe due to the action of a tension spring, disinfectant fluid is conveniently discharged, then the extending end of a first air cylinder is controlled to extend to the longest, a piston blocks the first air inlet pipe, and airflow in the first air inlet pipe enters the first air inlet pipe along a first hose; through the process, normal work of the ventilation equipment is guaranteed, meanwhile, bacteria are disinfected, and peculiar smells are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of indoor ventilation equipment, in particular to a ventilation equipment with controllable ventilation volume. BACKGROUND

[0002] The ventilation equipment is used for forcibly realizing air exchange by a fan and other power equipment, and can accurately control the ventilation volume, and has stable ventilation effect and can be combined with air purification and heat recovery functions; for some production enterprises, the use of the existing indoor ventilation equipment can effectively reduce the indoor dust content, and in order to save power, different motor speeds are adopted for different air dust contents. The existing ventilation equipment is generally in an open state for a long time, and in spring, the external air contains not only dust but also willows, and the willows and dust adsorbing moisture will affect each other, easily block the filter screen, and it is inconvenient to effectively clean the filter screen, which will affect the indoor ventilation efficiency; at the same time, the existing cleaning method of the filter screen cannot stop the ventilation equipment, and the willows and dust adsorbing moisture are easy to breed bacteria in spring, and if the filter screen is not disinfected, the odor will be generated. SUMMARY

[0003] The technical problem solved by the present application is: How to solve the problem that bacteria are easy to breed on the filter screen during the process of cleaning the filter screen without stopping the ventilation equipment, and odor is generated without disinfection; How to solve the problem that the willows and dust adsorbing moisture will affect each other, easily block the filter screen, and it is inconvenient to effectively clean the filter screen, which will affect the indoor ventilation efficiency.

[0004] The purpose of the present application can be achieved by the following technical scheme: a ventilation equipment with controllable ventilation volume, comprising a shell, a first air inlet pipe is communicated at the bottom of the side surface of the shell, a first filter screen is fixedly installed at the input end of the first air inlet pipe, a cleaning mechanism for cleaning the first filter screen is further arranged at the top of the side surface of the shell, a wind control mechanism for adjusting the air volume is arranged in the shell, and a cleaning mechanism for cleaning the inner wall of the first air inlet pipe is arranged below the wind control mechanism. The wind control mechanism comprises an adjusting cylinder fixedly connected to the inner wall of the shell, the first air outlet pipe and the second air outlet pipe are communicated at the side surface of the adjusting cylinder, and the output ends of the first air outlet pipe and the second air outlet pipe are fixedly penetrated through the shell.

[0005] Further technical improvement of the present application is that the first air inlet pipe and the second air inlet pipe are communicated at the side surface of the adjusting cylinder away from the first air outlet pipe, the position of the first air inlet pipe corresponds to the position of the first air outlet pipe, and the position of the second air inlet pipe corresponds to the position of the second air outlet pipe.

[0006] Further technical improvements of the present application are that the input end of the first air inlet pipe and the second air inlet pipe is fixedly installed with an air inlet fan, the middle part of the first air inlet pipe is communicated with a first connecting pipe, the lower part of the second air inlet pipe is fixedly provided with a second connecting pipe, and the top of the second connecting pipe is communicated with the output end of the first connecting pipe.

[0007] Further technical improvements of the present application are that the middle part of the first connecting pipe is fixedly installed with a one-way valve, and the opening direction of the one-way valve is the same as the direction of the airflow in the first air inlet pipe entering the first connecting pipe.

[0008] Further technical improvements of the present application are that the top of the shell is fixedly inserted with a first cylinder arranged longitudinally, the extended end of the first cylinder is movably penetrated through an adjusting cylinder, and a piston for plugging the output end of the first air inlet pipe is fixedly installed; by controlling the extended end of the electric push rod to be retracted to the shortest, the two rotating rods are driven to rotate by the lever, the input end of the first air inlet pipe is covered by the shielding cover, and after the set time period of the control valve is opened, the control valve is closed in time, so that the disinfectant water enters the first air inlet pipe along the second hose and the first hose, and the inner wall of the first air inlet pipe and the first filter screen are soaked and disinfected; after the disinfection of the first air inlet pipe is completed, the instruction of drying the first air inlet pipe is continuously issued, the extended end of the electric push rod is controlled to be elongated to reset to half the length, the shielding cover is separated from the first air inlet pipe due to the action of the tension spring, the disinfectant water in the first air inlet pipe is discharged, the extended end of the first cylinder is controlled to be elongated to the longest, the piston plugs the first air inlet pipe, the airflow in the first air inlet pipe pushes open the one-way valve, and enters the first air inlet pipe along the first hose, so as to quickly dry the inner wall of the first air inlet pipe and the first filter screen; through the above process, the bacteria are disinfected while ensuring the normal operation of the ventilation equipment, and the peculiar smell is avoided.

[0009] Further technical improvements of the present application are that the cleaning mechanism comprises a second cylinder fixedly connected with the inner wall bottom of the shell, the second cylinder is arranged transversely, and the extended end of the second cylinder is fixedly installed with a sealing plate, the inside of the sealing plate is fixedly inserted with a first hose, the position of the output end of the first hose corresponds to the position of the output end of the first air inlet pipe, and the input end of the first hose is communicated with the output end of the second connecting pipe.

[0010] Further technical improvements of the present application are that the inner wall of the shell is also fixedly installed with a storage barrel for storing disinfectant water, the output end of the storage barrel is communicated with a second hose, the output end of the second hose is communicated with the middle part of the first hose, and the output end of the storage barrel is also fixedly installed with a control valve.

[0011] Further technical improvements of the present application are that the cleaning mechanism comprises a rain cover fixedly connected with the side of the shell, a longitudinally arranged electric push rod is fixedly installed in the rain cover, and a rubber scraper is fixedly installed at the extending end of the electric push rod.

[0012] Further technical improvements of the present application are that the inner wall of the rain cover is provided with two rotating rods through pin shaft rotation, and a shielding cover is fixedly connected at one end of the two rotating rods.

[0013] Further technical improvements of the present application are that the extending end of the electric push rod is further fixedly inserted with a lever, the two ends of the lever correspond to the ends of the two rotating rods away from the shielding cover, and the middle part of one of the rotating rods close to the shielding cover is fixedly connected with the rain cover through a tension spring.

[0014] Compared with the prior art, the present application has the following beneficial effects: The application is used, by controlling the retraction of the extension end of the electric push rod to the shortest, the stirring rod drives the two rotating rods to rotate, the shielding cover covers the input end of the first air inlet pipe, and after the set time period of the control valve is opened, the control valve is closed in time, so that the disinfectant water enters the first air inlet pipe along the second hose and the first hose, and the inner wall of the first air inlet pipe and the first filter screen are soaked and disinfected; after the disinfection of the first air inlet pipe is completed, the instruction of drying the first air inlet pipe is continuously issued, the extension end of the electric push rod is controlled to extend to half the length, and due to the action of the tension spring, the shielding cover is separated from the first air inlet pipe, so that the disinfectant water in the first air inlet pipe is discharged, and then the extension end of the first cylinder is controlled to extend to the longest, so that the piston blocks the first air inlet pipe, the airflow in the first air inlet pipe pushes open the one-way valve, enters the first air inlet pipe along the first hose, and the inner wall of the first air inlet pipe and the first filter screen are quickly dried; through the above process, the bacteria are disinfected while ensuring the normal operation of the ventilation equipment, and the peculiar smell is avoided.

[0015] The application is used, by controlling the retraction of the extension end of the electric push rod to the shortest, the stirring rod drives the two rotating rods to rotate, the shielding cover covers the input end of the first air inlet pipe, and after the set time period of the control valve is opened, the control valve is closed in time, so that the disinfectant water enters the first air inlet pipe along the second hose and the first hose, and the inner wall of the first air inlet pipe and the first filter screen are soaked and disinfected; after the disinfection of the first air inlet pipe is completed, the instruction of drying the first air inlet pipe is continuously issued, the extension end of the electric push rod is controlled to extend to half the length, and due to the action of the tension spring, the shielding cover is separated from the first air inlet pipe, so that the disinfectant water in the first air inlet pipe is discharged, and then the extension end of the first cylinder is controlled to extend to the longest, so that the piston blocks the first air inlet pipe, the airflow in the first air inlet pipe pushes open the one-way valve, enters the first air inlet pipe along the first hose, and the inner wall of the first air inlet pipe and the first filter screen are quickly dried; through the above process, the bacteria are disinfected while ensuring the normal operation of the ventilation equipment, and the peculiar smell is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to facilitate those skilled in the art to understand, the application will be further described below with reference to the drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of the application; Figure 2 It is a schematic diagram of the overall structure of the application; Figure 3 It is a schematic diagram of the overall structure of the application; Figure 4 It is a schematic diagram of the overall structure of the application; Figure 5 It is a schematic diagram of the overall structure of the application; Figure 6 It is a three-dimensional schematic view of the cleaning mechanism structure of the present application.

[0018] In the figure: 1, the shell; 2, the cleaning mechanism; 3, the first air inlet pipe; 4, the second air inlet pipe; 5, the control panel; 6, the air inlet fan; 7, the first filter screen; 8, the cleaning mechanism; 9, the air control mechanism; 201, the rain cover; 202, the rotating rod; 203, the shielding cover; 204, the rubber scraper; 205, the push rod; 206, the tension spring; 207, the electric push rod; 801, the storage barrel; 802, the second hose; 803, the sealing plate; 804, the second air cylinder; 805, the first hose; 806, the control valve; 901, the piston; 902, the first air inlet pipe; 903, the second air inlet pipe; 904, the first connecting pipe; 905, the second connecting pipe; 906, the adjusting cylinder; 907, the first air cylinder; 908, the second air outlet pipe; 909, the first air outlet pipe. DETAILED DESCRIPTION

[0019] The technical solutions of the present application will be described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0020] Please refer to Figures 1-6 As shown in the figure, a controllable ventilation equipment of ventilation volume includes a shell 1, the side bottom of the shell 1 is communicated with a first air inlet pipe 3, the input end of the first air inlet pipe 3 is fixedly installed with a first filter screen 7, the side top of the shell 1 is further provided with a cleaning mechanism 2 for cleaning the first filter screen 7, the inside of the shell 1 is provided with an air control mechanism 9 for adjusting the air volume, and the lower part of the air control mechanism 9 is provided with a cleaning mechanism 8 for cleaning the inner wall of the first air inlet pipe 3.

[0021] Please refer to Figure 2 and Figure 3 As shown in the figure, the above-mentioned air control mechanism 9 includes an adjusting cylinder 906 fixedly connected to the inner wall of the shell 1, the side of the adjusting cylinder 906 is communicated with a first air outlet pipe 909 and a second air outlet pipe 908, and the output ends of the first air outlet pipe 909 and the second air outlet pipe 908 are fixedly penetrated through the shell 1.

[0022] Please refer to Figure 3 As shown in the figure, the side of the above-mentioned adjusting cylinder 906 away from the first air outlet pipe 909 is communicated with a first air inlet pipe 902 and a second air inlet pipe 903, the position of the first air inlet pipe 902 corresponds to the position of the first air outlet pipe 909, and the position of the second air inlet pipe 903 corresponds to the position of the second air outlet pipe 908.

[0023] Please refer to Figure 3As shown in the drawings, the input end of the first air inlet pipe 902 and the second air inlet pipe 903 is fixedly installed with an air inlet fan 6, the middle part of the first air inlet pipe 902 is communicated with a first connecting pipe 904, and the lower part of the second air inlet pipe 903 is fixedly provided with a second connecting pipe 905; the second connecting pipe 905 is arranged below the second air inlet pipe 903, so that the first hose 805 can be normally stretched and contracted, and the collision between the first hose 805 and the second hose 802 is prevented; and the top of the second connecting pipe 905 is communicated with the output end of the first connecting pipe 904.

[0024] As shown in the drawings, Figure 3 As shown in the drawings, the middle part of the first connecting pipe 904 is fixedly installed with a one-way valve, and the opening direction of the one-way valve is the same as the direction of the airflow in the first air inlet pipe 902 into the first connecting pipe 904.

[0025] As shown in the drawings, Figure 3 As shown in the drawings, the top of the shell 1 is fixedly inserted with a first air cylinder 907 arranged in a longitudinal direction, the extending end of the first air cylinder 907 is movably penetrated through the adjusting cylinder 906, and the extending end is fixedly installed with a piston 901 used for plugging the output end of the first air inlet pipe 902; by controlling the extending end of the electric push rod 207 to be the shortest, the toggle lever 205 drives the two rotating rods 202 to rotate, the shielding cover 203 covers the input end of the first air inlet pipe 3, and after the set time period of the control valve 806 is opened, the control valve 806 is closed in time, so that the disinfectant water enters the first air inlet pipe 3 along the second hose 802 and the first hose 805, and the inner wall and the first filter screen 7 of the first air inlet pipe 3 are soaked and disinfected; after the disinfection of the first air inlet pipe 3 is completed, the instruction of drying the first air inlet pipe 3 is continuously issued, the extending end of the electric push rod 207 is controlled to be reset to half length, and due to the action of the tension spring 206, the shielding cover 203 is separated from the first air inlet pipe 3, so that the disinfectant water in the first air inlet pipe 3 is discharged, and then the extending end of the first air cylinder 907 is controlled to be the longest, so that the piston 901 plugs the first air inlet pipe 902, the airflow in the first air inlet pipe 902 pushes open the one-way valve, and enters the first air inlet pipe 3 along the first hose 805, so as to quickly dry the inner wall and the first filter screen 7 of the first air inlet pipe 3. Through the above process, the bacteria are disinfected while ensuring the normal operation of the ventilation equipment, and the peculiar smell is avoided.

[0026] As shown in the drawings, Figure 2 and Figure 4 As shown in the drawings, the cleaning mechanism 8 includes a second air cylinder 804 fixedly connected with the inner wall bottom of the shell 1, the second air cylinder 804 is arranged in a transverse direction, the extending end of the second air cylinder 804 is fixedly installed with a sealing plate 803, the inside of the sealing plate 803 is fixedly inserted with a first hose 805, the position of the output end of the first hose 805 corresponds to the position of the output end of the first air inlet pipe 3, and the input end of the first hose 805 is communicated with the output end of the second connecting pipe 905.

[0027] See also Figure 4 As shown, a storage barrel 801 for storing disinfectant water is also fixedly installed on the inner wall of the above-mentioned shell 1. The output end of the storage barrel 801 is connected to a second hose 802. The output end of the second hose 802 is connected to the middle of the first hose 805. A control valve 806 is also fixedly installed in the middle of the output end of the storage barrel 801.

[0028] See also Figure 2 and Figure 5 As shown, the above-mentioned cleaning mechanism 2 includes a rain cover 201 fixedly connected to the side of the outer shell 1, and a longitudinally arranged electric push rod 207 is fixedly installed inside the rain cover 201. The protruding end of the electric push rod 207 is fixedly installed with a rubber scraper 204, and the position of the rubber scraper 204 corresponds to the position of the first filter 7.

[0029] See also Figure 5 and Figure 6 As shown, the inner wall of the above-mentioned rainproof cover 201 is provided with two rotating rods 202 through a pin shaft, and one end of the two rotating rods 202 is fixedly connected to a shielding cover 203. The position of the opening of the shielding cover 203 corresponds to the position of the output end of the first air inlet pipe 3.

[0030] See also Figure 5 and Figure 6 As shown, the protruding end of the electric push rod 207 is also fixedly inserted with a shift rod 205, and the two ends of the shift rod 205 correspond to the ends of the two rotating rods 202 away from the shielding cover 203 respectively, and one of the rotating rods 202 is fixedly connected to the rain cover 201 near the middle of the shielding cover 203 through a tension spring 206; by controlling the protruding end of the second cylinder 804 to extend to the longest, the bottom of the sealing plate 803 is separated from the output end of the second air intake pipe 4. At this time, the side of the sealing plate 803 blocks the output end of the first air intake pipe 3, and the output end of the first hose 805 is in a connected state with the output end of the first air intake pipe 3, so that the external air is sucked into the shell 1 through the second air intake pipe 4, and then The extended end of the electric push rod 207 is controlled to extend from half the length to the longest, and the impurities attached to the surface of the second filter are cleaned by the rubber scraper 204. During this process, the rubber scraper 204 will pass through the input end of the first air inlet pipe 3, and the first filter 7 will be cleaned by the rubber scraper 204 to absorb water-absorbing poplar fluff and dust, so as to avoid clogging of the first filter 7; in the above process, the first air inlet pipe 3 is first blocked by the sealing plate 803, so that the external air is sucked into the outer shell 1 through the second air inlet pipe 4, so as to ensure the normal use of the ventilation equipment, and then the rubber scraper 204 is controlled to clean the first filter 7, so as to avoid poplar fluff debris and dust being sucked into the outer shell 1 during the cleaning process, thereby preventing the efficiency of indoor ventilation from being affected.

[0031] See also Figure 1 、 Figure 2And Figure 5 As shown in the above, the front of the shell 1 is fixedly installed with a control panel 5, and the bottom of the shell 1 is communicated with a second air inlet pipe 4, the input end of the second air inlet pipe 4 is fixedly installed with a second filter screen, the position of the second filter screen corresponds to the position of the rubber scraper 204, and the output end of the second air inlet pipe 4 corresponds to the position of the bottom of the sealing plate 803.

[0032] Working principle: when the ventilating equipment is used for a long time, the control panel 5 is manually operated to issue an instruction to clean the first filter screen 7, the extension end of the second cylinder 804 is controlled to be elongated to the longest, so that the bottom of the sealing plate 803 is separated from the output end of the second air inlet pipe 4, at this time, the side of the sealing plate 803 blocks the output end of the first air inlet pipe 3, the output end of the first hose 805 is in communication with the output end of the first air inlet pipe 3, so that the external air is sucked into the shell 1 through the second air inlet pipe 4, and then the extension end of the electric push rod 207 is controlled to be elongated from half length to the longest, and the impurities attached to the surface of the second filter screen are cleaned by the rubber scraper 204, in the process, the rubber scraper 204 passes through the input end of the first air inlet pipe 3, and the first filter screen 7 is cleaned by the rubber scraper 204 to remove the water and dust, so as to avoid the first filter screen 7 from being blocked; in the above process, the first air inlet pipe 3 is blocked by the sealing plate 803, so that the external air is sucked into the shell 1 through the second air inlet pipe 4, the normal use of the ventilating equipment is ensured, the first filter screen 7 is cleaned by the rubber scraper 204, and the process of cleaning is avoided, so that the water and dust are not sucked into the shell 1, thereby preventing the efficiency of indoor ventilation from being affected; the instruction of disinfecting the first air inlet pipe 3 is issued again, the extension end of the electric push rod 207 is controlled to be retracted to the shortest, so that the two rotating rods 202 are driven to rotate by the lever 205, the input end of the first air inlet pipe 3 is covered by the shielding cover 203, after the set time period of the control valve 806 is opened, the control valve 806 is closed in time, so that the disinfectant water enters the first air inlet pipe 3 along the second hose 802 and the first hose 805, and the inner wall of the first air inlet pipe 3 and the first filter screen 7 are soaked and disinfected; after the disinfection of the first air inlet pipe 3 is completed, the instruction of drying the first air inlet pipe 3 is continuously issued, the extension end of the electric push rod 207 is controlled to be elongated to reset to half length, due to the action of the tension spring 206, the shielding cover 203 is separated from the first air inlet pipe 3, so that the disinfectant water in the first air inlet pipe 3 is discharged, the extension end of the first cylinder 907 is controlled to be elongated to the longest, so that the piston 901 blocks the first air inlet pipe 902, the airflow in the first air inlet pipe 902 pushes open the one-way valve, enters the first air inlet pipe 3 along the first hose 805, and the inner wall of the first air inlet pipe 3 and the first filter screen 7 are quickly dried, through the above process, the normal work of the ventilating equipment is ensured, the bacteria are disinfected, and peculiar smell is avoided.

[0033] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, as long as the changes or modifications do not deviate from the technical solution of the present application. Any modification, change, equivalent change and modification of the above embodiments made according to the technical essence of the present application still belong to the scope of the technical solution of the present application.

Claims

1. A controllable ventilation volume ventilation device, comprising a shell (1), the side bottom of the shell (1) is communicated with a first air inlet pipe (3), the input end of the first air inlet pipe (3) is fixedly installed with a first filter screen (7), characterized in that: The side top of the shell (1) is further provided with a cleaning mechanism (2) for cleaning the first filter screen (7), the inside of the shell (1) is provided with a wind control mechanism (9) for adjusting the air volume, and the lower portion of the wind control mechanism (9) is provided with a cleaning mechanism (8) for cleaning the inner wall of the first air inlet pipe (3). The wind control mechanism (9) comprises an adjusting cylinder (906) fixedly connected to the inner wall of the shell (1), a first air outlet pipe (909) and a second air outlet pipe (908) are communicated with the side of the adjusting cylinder (906), and the output ends of the first air outlet pipe (909) and the second air outlet pipe (908) are fixedly penetrated through the shell (1).

2. A controllable volume ventilation device according to claim 1, wherein, The side of the adjusting cylinder (906) away from the first air outlet pipe (909) is communicated with a first air inlet pipe (902) and a second air inlet pipe (903), the position of the first air inlet pipe (902) corresponds to the position of the first air outlet pipe (909), and the position of the second air inlet pipe (903) corresponds to the position of the second air outlet pipe (908).

3. A controllable volume ventilation device according to claim 2, wherein, The input ends of the first air inlet pipe (902) and the second air inlet pipe (903) are fixedly installed with air inlet fans (6), the middle portion of the first air inlet pipe (902) is communicated with a first connecting pipe (904), the lower portion of the second air inlet pipe (903) is fixedly provided with a second connecting pipe (905), and the top of the second connecting pipe (905) is communicated with the output end of the first connecting pipe (904).

4. A controllable volume ventilation device according to claim 3, wherein, The middle portion of the first connecting pipe (904) is fixedly installed with a one-way valve.

5. A controllable volume ventilation device according to claim 4, wherein, The top of the shell (1) is fixedly inserted with a first air cylinder (907), the extending end of the first air cylinder (907) is movably penetrated through the adjusting cylinder (906), and a piston (901) for blocking the output end of the first air inlet pipe (902) is fixedly installed.

6. A controllable volume ventilation device according to claim 3, wherein, The cleaning mechanism (8) comprises a second air cylinder (804) fixedly connected to the bottom of the inner wall of the shell (1), the extending end of the second air cylinder (804) is fixedly installed with a sealing plate (803), the inside of the sealing plate (803) is fixedly inserted with a first hose (805), the position of the output end of the first hose (805) corresponds to the position of the output end of the first air inlet pipe (3), and the input end of the first hose (805) is communicated with the output end of the second connecting pipe (905).

7. A controllable volume ventilation device according to claim 6, wherein, The inner wall of the shell (1) is further fixedly installed with a storage barrel (801), the output end of the storage barrel (801) is communicated with a second hose (802), the output end of the second hose (802) is communicated with the middle portion of the first hose (805), and the output end of the storage barrel (801) is further fixedly installed with a control valve (806).

8. A controllable volume ventilation device according to claim 1, wherein, The cleaning mechanism (2) comprises a rainproof cover (201) fixedly connected to the side of the shell (1), the inside of the rainproof cover (201) is fixedly installed with an electric push rod (207), the extending end of the electric push rod (207) is fixedly installed with a rubber scraper (204), and the position of the rubber scraper (204) corresponds to the position of the first filter screen (7).

9. A controllable volume ventilation device according to claim 8, wherein, The inner wall of the rain cover (201) is rotationally provided with two rotating rods (202), one end of the two rotating rods (202) is fixedly connected with a shielding cover (203), and the opening position of the shielding cover (203) corresponds to the position of the output end of the first air inlet pipe (3).

10. A controllable volume ventilation device according to claim 9, wherein, The extending end of the electric push rod (207) is also fixedly provided with a push rod (205), the two ends of the push rod (205) correspond to the one end of the two rotating rods (202) away from the shielding cover (203) respectively, and the middle part of the one rotating rod (202) close to the shielding cover (203) is fixedly connected with the rain cover (201) through the tension spring (206).

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