Workshop air concentration adjusting fan

Abstract

The invention relates to the technical field of feed workshop processing, and provides a workshop air concentration adjusting draught fan which comprises a draught fan pipe set, an air return pipe set, a purification tank and a medicine adding device, the draught fan pipe set extracts air in a workshop and monitors the concentration of harmful gas in the air in real time, and the purification tank is used for receiving the air conveyed by the draught fan pipe set; a spiral flow mixing structure is adopted, a spiral channel is formed through a flow dividing cover and a partition plate in the purification tank, air and purified water containing a medicament are spirally mixed under the action of centrifugal force, the contact time is prolonged, the mass transfer efficiency is improved, and micron-level atomization of the medicament is achieved and the gas-liquid contact area is increased in cooperation with combination of hemispherical head jet flow holes and a silk screen; the spring stop ring structure realizes automatic sealing in a non-working state, prevents medicament leakage, remarkably improves the harmful gas absorption efficiency compared with the traditional aeration or simple spraying, spiral flow mixing and atomization technologies, and is particularly suitable for high-concentration and multi-component pollution gas.

Description

Technical Field

[0001] The present invention relates to the technical field of feed workshop processing, and specifically, to a workshop air concentration regulating fan. Background Art

[0002] In the production and processing of feeds, most feed workshops have disadvantages such as a large amount of dust and a harsh working environment, which are not only extremely harmful to the physical health of operators, but also pollute feed raw materials and cause a decline in feed quality. In the prior art, large dust removal equipment is adopted, which occupies a large space, and the investment and operation costs are very high, making it difficult for small enterprises to bear, while small dust removal equipment cannot meet the dust removal requirements of feed workshops. After retrieval, the ventilation and dust removal device for a feed workshop with the publication number CN207487063U is disclosed. The device consists of a workshop, a ventilation device, and a dust removal device. The characteristics are that a dust concentration sensor is arranged inside the workshop, a ventilation device is arranged on the wall on one side inside the workshop, and a dust removal device is arranged outside the wall on the other side. The dust removal device consists of a dust collector, a suction fan, a suction pipe, and an air inlet. The dust collector is connected to the suction fan, the suction fan is connected with the suction pipe, the suction pipe extends into the workshop and is arranged parallel to the roof inside the workshop.

[0003] However, the above ventilation and dust removal device for a feed workshop still has the following problems: Since feed additives usually include vitamins, minerals, amino acids, enzyme preparations, antioxidants, preservatives, etc. Various chemical reactions may be used in the production of these additives, such as high-temperature treatment, fermentation, acid-base reactions, etc., which may all release harmful gases. For example, ammonia (NH3) may be produced during fermentation or when using nitrogen-containing compounds; hydrogen sulfide (H2S) may appear when processing sulfur-containing substances; volatile organic compounds (VOCs) such as benzene, toluene, and xylene may be released during solvent use or certain synthesis reactions; carbon monoxide (CO) may come from incomplete combustion or certain chemical reactions; sulfur dioxide (SO2) may come from the treatment of sulfur-containing raw materials; and there are also chlorine (Cl2), nitrogen oxides (NOx), etc., if chlorination or high-temperature reactions are involved. The prior art can only handle the dust in the air and cannot detect the concentration of harmful gases in the feed processing workshop and purify and regulate the air quality of the workshop. Summary of the Invention

[0004] The present invention provides a workshop air concentration regulating fan, which solves the problem that the prior art cannot detect the concentration of harmful gases in the feed processing workshop and purify and regulate the air quality of the workshop.

[0005] The technical solution of the present invention is as follows: A workshop air concentration regulating fan includes a fan pipe group, a return air pipe group, a purification tank, and a chemical dosing device. The fan pipe group extracts the air in the workshop and monitors the concentration of harmful gases in the air in real time. The purification tank is used to receive the air conveyed by the fan pipe group. The chemical dosing device adds an appropriate amount of purification chemical agent into the purification tank according to the concentration of harmful gases in the air. A mixing structure immersed in the purification water is arranged in the bottom cavity of the purification tank. The mixing structure makes the air introduced by the fan pipe group mix spirally with the purification water containing the chemical agent. An atomizing nozzle for atomizing and spraying the chemical agent added by the chemical dosing device and further mixing with the air discharged by the mixing structure is arranged in the top cavity of the purification tank. The return air pipe group is used to return the purified air in the purification tank to the workshop.

[0006] Preferably, the fan pipe group includes an induced draft fan. The input end of the induced draft fan is connected with an air inlet hood through an air extraction pipe. A first detection device for detecting the air drawn in is arranged on the air extraction pipe. The output end of the induced draft fan is connected with an air inlet pipe leading into the purification tank.

[0007] Preferably, the return air pipe group includes an exhaust air pipe. One end of the exhaust air pipe is connected with an air outlet hood. The other end of the exhaust air pipe leads to the top cavity of the purification tank. A second detection device for detecting the discharged air is arranged on the exhaust air pipe.

[0008] Preferably, the chemical dosing device includes a chemical dosing pump and a medicine box. The input end of the chemical dosing pump communicates with the bottom cavity of the purification tank through a water extraction pipe. The output end of the chemical dosing pump is connected with the atomizing nozzle through a water outlet pipe. A plurality of medicine inlet pipes communicated with the water outlet pipe are connected to the bottom of the medicine box, and an electromagnetic valve is arranged on each medicine inlet pipe.

[0009] Preferably, the mixing structure includes a flow dividing hood and a partition plate. The flow dividing hood and the partition plate are both fixed in the purification tank. The flow dividing hood gradually converges from bottom to top towards the air outlet of the air inlet pipe. A plurality of flow guiding hoods gradually converging towards the flow dividing hood from top to bottom are fixed at the bottom of the partition plate. A spiral plate is fixed between each flow guiding hood and the purification tank. The spiral plate forms a spiral channel between the flow guiding hood and the sandwich cavity of the purification tank. A plurality of first guide holes communicated with the bottom opening of the spiral channel are arranged on the flow dividing hood. A plurality of second guide holes communicated with the top opening of the spiral channel are arranged on the partition plate.

[0010] Preferably, the atomizing nozzle includes a joint. The joint is fixedly installed at the water outlet of the water outlet pipe. A jet flow assembly capable of telescopic sliding is arranged at the bottom of the joint, and the jet flow assembly is elastically connected with the joint through a spring. A stop ring for stopping the retraction of the jet flow assembly is arranged in the joint, and a C-shaped flow channel is arranged below the stop ring of the joint; In the dosing state, the jet assembly overcomes the elastic force of the spring, and the fluid is introduced into the jet assembly through the flow channel and atomized and ejected by the jet assembly. In the non-dosing state, the jet assembly automatically closes the flow channel under the action of the elastic force of the spring.

[0011] Preferably, the jet assembly includes a slide rod, the slide rod is slidably connected to the joint, a first ring plug and a second ring plug are fixedly sleeved on the outer side of the upper end of the slide rod, the first ring plug and the second ring plug are arranged up and down and are both in close fit with the inner wall of the joint, the slide rod is a hollow tubular structure, through holes are formed in the part of the slide rod between the first ring plug and the second ring plug, the lower end of the slide rod extends out of the joint and is fixed with a hemispherical head, and a plurality of jet holes are formed in the hemispherical head.

[0012] Preferably, the spring is sleeved outside the slide rod, one end of the spring abuts against the second ring plug, and the other end of the spring abuts against the bottom inner wall of the joint.

[0013] Preferably, when the first ring plug abuts against the stop ring, the inlet of the flow channel is at the height position of the first ring plug, and the outlet of the flow channel is at the height position of the second ring plug.

[0014] Preferably, the jet holes are in the form of micro-hole structures that diverge uniformly outward from the center of the hemispherical head, and a wire mesh is arranged in each hole.

[0015] The beneficial effects of the present invention are as follows: 1. The present invention adopts a dynamic monitoring and closed-loop control system. The harmful gases (such as NH3, H2S, VOCs, etc.) in the intake air and exhaust air are respectively monitored in real time through the blower pipe group (the first detection device) and the return air pipe group (the second detection device) to form a closed-loop control, and the types and dosages of the medicaments of the dosing device (solenoid valve + medicine box) are dynamically adjusted according to the detection results to achieve precise purification and avoid waste of medicaments; 2. The present invention adopts a spiral mixed flow structure form. A spiral channel is formed by the flow dividing cover and the partition plate in the purification tank, so that the air and the purified water containing the medicament are spirally mixed under the action of centrifugal force, the contact time is prolonged, and the mass transfer efficiency is enhanced. The combination of the hemispherical head jet holes and the wire mesh is used to realize the micron-level atomization of the medicament and increase the gas-liquid contact area; the spring stop ring structure realizes automatic sealing in the non-working state to prevent leakage of the medicament. Compared with traditional aeration or simple spraying, the combination of spiral mixed flow and atomization technology significantly improves the absorption efficiency of harmful gases, and is especially suitable for high-concentration and multi-component polluted gases; 3. The present invention adopts an integrated treatment method for dust and gas. It filters dust through purified water and removes gaseous pollutants with agents, achieving the dual functions of "dust removal + gas removal". The purified air is refluxed to the workshop through the return air pipe group, reducing the demand for fresh air introduction and lowering energy consumption. It is applicable to small and medium-sized feed workshops, taking into account both treatment efficiency and economy, and solving the pain point that small enterprises are difficult to afford large-scale equipment. 4. The present invention adopts a solenoid valve group and multi-agent configuration. The medicine box is connected to the solenoid valve through multiple medicine inlet pipes, and agents for different harmful gases can be added simultaneously (such as NaOH to neutralize acidic gases and NaClO to oxidize VOCs). The self-sealing atomizing nozzle has a spring that automatically seals the flow channel in the non-working state, preventing pipeline pollution or agent drying and blockage, improving the automation level of the equipment, reducing manual intervention, and enhancing the long-term operation stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0017] Figure 1 It is a schematic diagram of the overall structure of a workshop air concentration regulating fan proposed by the present invention; Figure 2 It is a schematic diagram of the overall sectional structure of a workshop air concentration regulating fan proposed by the present invention; Figure 3 It is Figure 2 The enlarged schematic diagram at position A in Figure 4 It is Figure 2 The enlarged schematic diagram at position B in Figure 5 It is Figure 2 The enlarged schematic diagram at position C in Figure 6 It is a schematic diagram of the half-sectional structure of the atomizing nozzle proposed by the present invention; In the figure: 1. Fan pipe group; 11. Induced draft fan; 12. Exhaust pipe; 13. Air inlet hood; 14. First detection device; 15. Intake pipe; 2. Return air pipe group; 21. Exhaust duct; 22. Air outlet hood; 23. Second detection device; 3. Purification tank; 4. Chemical dosing device; 41. Chemical dosing pump; 42. Medicine box; 43. Water suction pipe; 44. Water outlet pipe; 45. Medicine inlet pipe; 46. Solenoid valve; 5. Mixed flow structure; 51. Flow splitting hood; 52. Partition board; 53. Flow guiding hood; 54. Spiral plate; 55. First guide hole; 56. Second guide hole; 6. Atomizing nozzle; 61. Connector; 62. Jet component; 621. Slide bar; 622. Hemispherical head; 623. First ring plug; 624. Second ring plug; 625. Through hole; 626. Jet hole; 63. Spring; 64. Flow channel; 65. Positioning ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0019] Please refer to Figure 1 and Figure 2 , the present invention provides a technical solution: a workshop air concentration regulating fan, including a fan pipe group 1, a return air pipe group 2, a purification tank 3 and a dosing device 4. The fan pipe group 1 extracts the air in the workshop and monitors the concentration of harmful gases in the air in real time. The purification tank 3 is used to receive the air conveyed by the fan pipe group 1. The dosing device 4 adds an appropriate amount of purification agent into the purification tank 3 according to the concentration of harmful gases in the air. A mixing structure 5 immersed in the purification water is arranged in the bottom cavity of the purification tank 3. The mixing structure 5 makes the air introduced by the fan pipe group 1 mix spirally with the purification water containing the agent. An atomizing nozzle 6 for atomizing and spraying the agent added by the dosing device 4 and further mixing with the air discharged by the mixing structure 5 is arranged in the top cavity of the purification tank 3. The return air pipe group 2 is used to return the purified air in the purification tank 3 to the workshop.

[0020] Furthermore, the fan pipe group 1 includes an induced draft fan 11. The input end of the induced draft fan 11 is connected with an air inlet hood 13 through an air extraction pipe 12. A first detection device 14 for detecting the sucked air is arranged on the air extraction pipe 12. The output end of the induced draft fan 11 is connected with an air inlet pipe 15 leading into the purification tank 3. The return air pipe group 2 includes an exhaust pipe 21. One end of the exhaust pipe 21 is connected with an air outlet hood 22. The other end of the exhaust pipe 21 leads to the top cavity of the purification tank 3. A second detection device 23 for detecting the discharged air is arranged on the exhaust pipe 21. It should be noted that the first detection device 14 and the second detection device 23 can select one or a combination of two or more electrical components such as electrochemical sensors, semiconductor sensors, and infrared sensors for detecting and analyzing gases such as O2, CO, NO2, NH3, SO2, H2S, VOCs (such as benzene, toluene), CO, and H2 in the air.

[0021] Furthermore, the chemical dosing device 4 includes a chemical dosing pump 41 and a medicine box 42. The input end of the chemical dosing pump 41 is communicated with the bottom cavity of the purification tank 3 through a water suction pipe 43, and the output end of the chemical dosing pump 41 is connected to an atomizing nozzle 6 through a water outlet pipe 44. A plurality of medicine inlet pipes 45 communicated with the water outlet pipe 44 are connected to the bottom of the medicine box 42, and an electromagnetic valve 46 is arranged on each medicine inlet pipe 45. During the ventilation of the feed processing workshop, the first detection device 14 can detect the concentration of harmful gases in the air and feedback it to the chemical dosing control system. Since the medicine box 42 stores a medicine corresponding to the components of the harmful gases, the type and dosage of the added medicine matching the components of the harmful gases are controlled through the electromagnetic valve 46, so that a certain amount of medicine is transported to the atomizing nozzle 6 through the water outlet pipe 44.

[0022] Please refer to Figure 3 and Figure 4 , the mixed flow structure 5 includes a flow dividing cover 51 and a partition plate 52. The flow dividing cover 51 and the partition plate 52 are both fixed in the purification tank 3. The flow dividing cover 51 gradually converges from bottom to top towards the air outlet of the air inlet pipe 15. A plurality of flow guiding covers 53 that gradually converge towards the flow dividing cover 51 from top to bottom are fixed to the bottom of the partition plate 52. A spiral plate 54 is fixed between each flow guiding cover 53 and the purification tank 3. The spiral plate 54 forms a spiral channel between the flow guiding cover 53 and the sandwich cavity of the purification tank 3. A plurality of first guide holes 55 communicated with the bottom opening of the spiral channel are opened on the flow dividing cover 51, and a filter screen is arranged in the first guide holes 55 to facilitate the interception of impurities. A bottom cover that can be opened is arranged in the bottom cavity of the purification tank 3 for regularly cleaning the impurities in the flow dividing cover 51. A plurality of second guide holes 56 communicated with the top opening of the spiral channel are opened on the partition plate 52. The air introduced into the flow dividing cover 51 enters the spiral channel formed by the spiral plate 54 through the first guide holes 55 and is ejected upward through the second guide holes 56 on the partition plate 52, so as to give an upward lifting force to the falling atomized liquid, thereby being able to extend the falling speed of the atomized liquid and making the ejected gas mix with the falling atomized liquid again to further improve the purification effect on harmful gases.

[0023] Please refer to Figure 5 and Figure 6 , the atomizing nozzle 6 includes a joint 61. The joint 61 is fixedly installed at the water outlet of the water outlet pipe 44. A jet assembly 62 that can telescopically slide is arranged at the bottom of the joint 61, and the jet assembly 62 is elastically connected to the joint 61 through a spring 63. A stop ring 65 for stopping the retraction of the jet assembly 62 is arranged in the joint 61, and a C-shaped flow channel 64 is opened below the joint 61 at the position of the stop ring 65; In the medicine adding state, the jet component 62 overcomes the elastic force of the spring 63, and the fluid is introduced into the jet component 62 through the flow channel 64 and atomized and ejected by the jet component 62. In the non-medicine adding state, the jet component 62 automatically closes the flow channel 64 under the action of the elastic force of the spring 63. The jet component 62 includes a sliding rod 621, and the sliding rod 621 is slidably connected to the joint 61. A first ring plug 623 and a second ring plug 624 are fixedly sleeved on the outer side of the upper end of the sliding rod 621. The first ring plug 623 and the second ring plug 624 are arranged up and down and are both in close fit with the inner wall of the joint 61. The sliding rod 621 is a hollow tubular structure. A through hole 625 is opened in the part of the sliding rod 621 between the first ring plug 623 and the second ring plug 624. The lower end of the sliding rod 621 extends out of the joint 61 and is fixed with a hemispherical head 622. A plurality of jet holes 626 are opened on the hemispherical head 622. Further, the spring 63 is sleeved outside the sliding rod 621. One end of the spring 63 abuts against the second ring plug 624, and the other end of the spring 63 abuts against the bottom inner wall of the joint 61. Further, when the first ring plug 623 abuts against the stop ring 65, the inlet of the flow channel 64 is at the height position of the first ring plug 623, and the outlet of the flow channel 64 is at the height position of the second ring plug 624. Further, the jet holes 626 are micro-hole structures uniformly diverging outward from the center of the hemispherical head 622, and a wire mesh is arranged in each hole. When the liquid in the purification tank 3 is circulated through the medicine adding pump 41, under the action of pressure, the elastic force of the spring 63 is overcome to push the sliding rod 621 downward, so that the first ring plug 623 and the second ring plug 624 move downward to open the upper and lower ports of the flow channel 64, so that the liquid can enter the inner cavity of the sliding rod 621 through the through hole 625 and then diverge outward and be atomized and ejected through the jet holes 626 on the hemispherical head 622.

[0024] The working principle and usage process of the present invention are as follows: In the daily state, the induced draft fan 11 works to extract the air in the workshop through the air inlet hood 13 and the air extraction pipeline 12, and introduce it into the bottom cavity of the purification tank 3 through the air inlet pipeline 15, contact with the purified water in the bottom cavity, and the dust in the air remains in the water and is intercepted by the filter screen on the shunt cover 51. The air after aeration in the purified water is discharged through the exhaust pipeline 21 and the air outlet hood 22 and then flows back into the workshop. During this process, the first detection device 14 can detect the concentration of harmful gases in the air and feedback it to the medicine adding control system. Since the medicine box 42 stores the medicine corresponding to the components of the harmful gases, the type and dosage of the medicine added are controlled through the solenoid valve 46 to match the harmful gas components, so that a certain amount of medicine is transported to the atomizing nozzle 6 through the water outlet pipe 44; When the liquid in the purification tank 3 is circulated by the chemical dosing pump 41, under the action of pressure, the sliding rod 621 is pushed downward against the elastic force of the spring 63, so that the first ring plug 623 and the second ring plug 624 move downward to open the upper and lower ports of the flow channel 64, so that the liquid can enter the inner cavity of the sliding rod 621 through the through hole 625, and then diverge and atomize and spray out through the jet holes 626 on the hemispherical head 622. The air introduced into the shunt cover 51 enters the spiral channel formed by the spiral plate 54 through the first guide hole 55 and sprays upward through the second guide hole 56 on the partition plate 52, so as to give the falling atomized liquid an upward lifting force, so that the falling speed of the atomized liquid can be extended, and the sprayed gas and the falling atomized liquid can be mixed again to further improve the purification effect on harmful gases; The atomized liquid falls on the partition plate 52 under the action of gravity, then reversely enters the spiral channel through the second guide hole 56, enters the shunt cover 51 through the first guide hole 55 for convergence, and then circulates and is used through the water suction pipe 43. During the process that the purified air rises to the top cavity of the purification tank 3 and is discharged to the workshop through the exhaust duct 21 and the air outlet hood 22, the components in the air are detected again by the second detection device 23 on the exhaust duct 21, and then fed back to the chemical dosing control system.

[0025] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air concentration regulating fan for a workshop, comprising a fan pipe group (1), a return air pipe group (2), a purification tank (3) and a dosing device (4), characterized in that, The blower pipe group (1) extracts the air in the workshop and monitors the concentration of harmful gases in the air in real time. The purification tank (3) is used to receive the air conveyed by the blower pipe group (1). The dosing device (4) adds an appropriate amount of purification agent into the purification tank (3) according to the concentration of harmful gases in the air. A mixing structure (5) immersed in the purification water is arranged in the bottom cavity of the purification tank (3). The mixing structure (5) enables the air introduced by the blower pipe group (1) to be mixed spirally with the purification water containing the agent. An atomizing nozzle (6) is arranged in the top cavity of the purification tank (3) to atomize and spray the agent added by the dosing device (4) and further mix it with the air discharged by the mixing structure (5). The return air pipe group (2) is used to return the purified air in the purification tank (3) to the workshop.

2. The air concentration regulating fan for a workshop according to claim 1, characterized in that, The blower pipe group (1) includes an induced draft fan (11). The input end of the induced draft fan (11) is connected with an air inlet hood (13) through an air extraction pipe (12). A first detection device (14) for detecting the sucked air is arranged on the air extraction pipe (12). The output end of the induced draft fan (11) is connected with an air inlet pipe (15) leading into the purification tank (3).

3. The air concentration regulating fan for a workshop according to claim 1, wherein, The return air pipe group (2) includes an exhaust pipe (21). One end of the exhaust pipe (21) is connected with an air outlet hood (22). The other end of the exhaust pipe (21) leads to the top cavity of the purification tank (3). A second detection device (23) for detecting the discharged air is arranged on the exhaust pipe (21).

4. The air concentration regulating fan for a workshop according to claim 1, wherein The dosing device (4) includes a dosing pump (41) and a medicine box (42). The input end of the dosing pump (41) communicates with the bottom cavity of the purification tank (3) through a water extraction pipe (43). The output end of the dosing pump (41) is connected with the atomizing nozzle (6) through a water outlet pipe (44). A plurality of medicine inlet pipes (45) communicated with the water outlet pipe (44) are connected to the bottom of the medicine box (42), and an electromagnetic valve (46) is arranged on each medicine inlet pipe (45).

5. The air concentration regulating fan for a workshop according to claim 2, wherein, The mixing structure (5) includes a flow splitting cover (51) and a partition plate (52). The flow splitting cover (51) and the partition plate (52) are both fixed in the purification tank (3). The flow splitting cover (51) gradually converges from bottom to top towards the air outlet of the air inlet pipe (15). A plurality of flow guiding covers (53) gradually converging towards the flow splitting cover (51) from top to bottom are fixed to the bottom of the partition plate (52). A spiral plate (54) is fixed between each flow guiding cover (53) and the purification tank (3). The spiral plate (54) forms a spiral channel between the flow guiding cover (53) and the clamping cavity of the purification tank (3). A plurality of first guiding holes (55) communicated with the bottom opening of the spiral channel are formed in the flow splitting cover (51). A plurality of second guiding holes (56) communicated with the top opening of the spiral channel are formed in the partition plate (52).

6. The air concentration regulating fan for a workshop according to claim 4, wherein The atomizing nozzle (6) includes a connector (61) fixedly installed at the water outlet of the water outlet pipe (44). A jet assembly (62) capable of telescopic sliding is provided at the bottom of the connector (61), and the jet assembly (62) is elastically connected to the connector (61) through a spring (63). A stop ring (65) for retracting and positioning the jet assembly (62) is provided in the connector (61), and a C-shaped flow channel (64) is provided below the stop ring (65) in the connector (61). In the dosing state, the jet assembly (62) overcomes the elastic force of the spring (63), and the fluid is introduced into the jet assembly (62) through the flow channel (64) and atomized and ejected by the jet assembly (62). In the non-dosing state, the jet assembly (62) automatically closes the flow channel (64) under the action of the elastic force of the spring (63).

7. The air concentration regulating fan for a workshop according to claim 6, characterized in that, The jet assembly (62) includes a slide rod (621) slidably connected to the connector (61). A first ring plug (623) and a second ring plug (624) are fixedly sleeved on the outer side of the upper end of the slide rod (621). The first ring plug (623) and the second ring plug (624) are arranged up and down and are both in close contact with the inner wall of the connector (61). The slide rod (621) is a hollow tubular structure. A through hole (625) is provided in the part of the slide rod (621) between the first ring plug (623) and the second ring plug (624). The lower end of the slide rod (621) extends out of the connector (61) and is fixed with a hemispherical head (622). A plurality of jet holes (626) are provided in the hemispherical head (622).

8. The air concentration regulating fan for a workshop according to claim 7, characterized in that, The spring (63) is sleeved outside the slide rod (621). One end of the spring (63) abuts against the second ring plug (624), and the other end of the spring (63) abuts against the inner wall of the bottom of the connector (61).

9. The air concentration regulating fan for a workshop according to claim 7, characterized in that, When the first ring plug (623) abuts against the stop ring (65), the inlet of the flow channel (64) is at the height position of the first ring plug (623), and the outlet of the flow channel (64) is at the height position of the second ring plug (624).

10. A workshop air concentration regulating fan according to claim 7, characterized in that, The jet holes (626) are micro-hole structures evenly diverging outward from the center of the hemispherical head (622), and a wire mesh is provided in each hole.

Images