Air speed self-adjusting exhaust pipeline for fuming cupboard

Abstract

The utility model provides an exhaust duct capable of automatically adjusting air speed for a fuming cupboard, which comprises an air pipe, a control valve is movably mounted in the air pipe and used for controlling the air flowing speed in the air pipe, a plurality of upper bearing caps are mounted on the upper side of the air pipe, a plurality of lower bearing caps are mounted on the lower side of the air pipe, and the air pipe is connected with the control valve. The control valve comprises a first valve plate, a second valve plate and a third valve plate. Compared with the prior art, the automatic lubricating device has the advantages that the upper bearing cap and the lower bearing cap are arranged to be matched with the rotating shaft, and the first sponge sleeve and the second sponge sleeve on the rotating shaft continuously absorb lubricating oil liquid to continuously lubricate bearings on the upper side and the lower side; the rotating shaft can keep a high rotating freedom degree all the time, the situation that the adjusting capacity is lost due to the fact that the rotating shaft is prone to being rusted or blocked due to dust deposition in a humid dusty environment is avoided, the first sponge sleeve and the second sponge sleeve have a certain isolation effect, water vapor and dust are made to be difficult to enter the bearing, and it is guaranteed that the whole control valve can operate flexibly.

Description

Technical Field

[0001] This utility model belongs to the field of ventilation equipment technology, and specifically relates to an exhaust duct with self-adjusting wind speed for fume hoods. Background Technology

[0002] In existing fume hood exhaust ducts, the damper shafts are prone to corrosion or jamming due to dust accumulation in humid and dusty environments, resulting in a loss of adjustment capability. This problem brings several drawbacks. First, once the shaft is corroded or jammed, the damper cannot flexibly adjust its opening and closing angle, making it difficult to accurately control the exhaust volume according to actual needs, affecting ventilation efficiency and experimental safety. Second, long-term malfunctioning dampers may cause local airflow turbulence, increasing the risk of harmful gas leakage and threatening the health of operators. These drawbacks mainly stem from the fact that the working environment of fume hoods is usually accompanied by high humidity and suspended particulate matter in the air. The combined action of moisture and dust accelerates the oxidation of the metal shaft surface, forming a rust layer. At the same time, dust accumulation creates mechanical obstruction, ultimately hindering the movement of the shaft or even causing it to jam completely.

[0003] Conventional solutions include regularly disassembling and cleaning the shaft, applying anti-rust grease, and replacing ordinary carbon steel with stainless steel. However, these methods also have drawbacks. For example, frequent disassembly and cleaning significantly increases maintenance workload and costs; while anti-rust grease can slow down the rusting process, it may fail under high temperatures or chemical corrosion environments; and although replacing with stainless steel improves corrosion resistance, it significantly increases manufacturing costs and still cannot completely prevent dust accumulation. Therefore, we hope to design a ventilation duct with a novel structure to solve this problem. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an exhaust duct with self-adjusting air speed for fume hoods, thereby solving the problems mentioned in the background art.

[0005] This utility model is achieved through the following technical solution: a self-regulating exhaust duct for a fume hood, comprising: a duct, wherein a control valve is movably installed inside the duct to control the airflow speed inside the duct, and multiple upper bearing caps are installed on the upper side of the duct and multiple lower bearing caps are installed on the lower side of the duct.

[0006] The control valve includes valve plate one, valve plate two, and valve plate three. Valve plate one, valve plate two, and valve plate three are rotatably installed inside the duct from left to right. Each valve plate is rotatably installed inside the duct via a rotating shaft. A transmission connecting rod is installed between the front sides of valve plate one and valve plate two, and between the rear sides of valve plate two and valve plate three, respectively, to drive valve plate one and valve plate three to rotate with valve plate two. In actual use, the upper end of the rotating shaft on valve plate two extends upwards through the top of the duct and is rotatably and sealingly connected to it. The extended portion of the rotating shaft connects to the top of the duct. The actuator is connected to the valve plate and contains a servo motor and a right-angle reducer to drive the rotating shaft on the valve plate two to rotate counterclockwise or clockwise, thus opening or closing it. An upper bearing cap is also installed on the upper side of the rotating shaft on the valve plate two. However, the upper end of the rotating shaft passes through the upper bearing cap located at the top of the air duct. The rest of the structure is the same as the upper bearing cap in other positions. The through part is connected by a rotating shaft sealing connection. Oil can be injected normally into it. The upper bearing cap is located at the bottom of the actuator housing. An oil filling hole is reserved on the side of the actuator. Oil is injected through a hose.

[0007] In a preferred embodiment, the top of the upper bearing cap and the bottom of the lower bearing cap are respectively threaded with a knob for sealing the oil filling hole and the drain hole, and a partition is provided inside the upper side of the upper bearing cap.

[0008] In a preferred embodiment, the upper part of the partition plate of the upper bearing cap is provided with an oil storage cavity, and the middle of the partition plate is provided with a rotating hole for rotatably connecting with the upper end of the rotating shaft.

[0009] In a preferred embodiment, the upper end of the rotating shaft is provided with an oil injection hole facing downwards, the lower end of the oil injection hole does not penetrate the lower end of the rotating shaft, and the upper outer wall of the rotating shaft is provided with an inclined oil passage facing upwards, the inner end of the inclined oil passage being connected to the upper part of the oil injection hole.

[0010] In a preferred embodiment, a sponge sleeve is fitted on the upper outer wall of the rotating shaft, and the sponge sleeve does not rotate with the rotating shaft. The lower end of the inclined oil passage is placed inside the sponge sleeve.

[0011] In a preferred embodiment, the rotating shaft extends backward through the middle to form a fixing hole, and the inner wall of the fixing hole is provided with an internal thread groove.

[0012] In a preferred embodiment, the lower end of the oil injection hole is provided with an inclined oil passage II in the direction of the downward slope of the outer wall of the shaft, and the upper end of the inclined oil passage II is flush with the bottom of the oil injection hole.

[0013] In a preferred embodiment, a second sponge sleeve is fitted on the outer wall of the lower end of the rotating shaft, and the second sponge sleeve does not rotate with the rotating shaft. The second sponge sleeve is placed inside the upper side of the lower bearing cap, and the outer end of the second inclined oil passage is placed inside the second sponge sleeve. In actual use, by setting the rotating shaft, the first and second inclined oil passages on it provide lubricating oil for the bearings at the top and bottom of the rotating shaft. It needs to be disassembled for lubrication and oiling, which facilitates subsequent maintenance and avoids the problem of poor movement caused by the reduction of lubricating oil after long-term use.

[0014] After adopting the above technical solution, the beneficial effects of this utility model are: 1. By setting the upper bearing cap and the lower bearing cap, the connection between the rotating shaft and the air duct can be sealed to prevent the rotating parts from rusting due to being in a harsh environment for a long time, thereby ensuring that the entire control valve can operate freely. The lower bearing cap can receive the excess lubricating oil and continuously lubricate the bearing on the lower side of the rotating shaft.

[0015] 2. By setting up a rotating shaft, the lubricating oil inside the oil injection hole can flow through inclined oil passage one and inclined oil passage two to the upper and lower outer walls of the rotating shaft. Since a sponge sleeve one and a sponge sleeve two are respectively fitted on the upper and lower outer walls of the rotating shaft, the sponge sleeve one and sponge sleeve two continuously absorb the lubricating oil to continuously lubricate the upper and lower bearings. This allows the rotating shaft to always maintain a high degree of rotational freedom and will not easily rust or get stuck due to dust accumulation in a humid and dusty environment, thus losing its adjustment ability. The sponge sleeve one and sponge sleeve two also have a certain isolation effect, making it difficult for water vapor and dust to enter the bearing, ensuring that the entire control valve can operate flexibly. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the exhaust duct for the self-adjusting wind speed of the fume hood of this utility model.

[0018] Figure 2 This is a schematic diagram showing the connection between the exhaust duct and the control valve of the self-regulating airflow exhaust duct for the fume hood of this utility model.

[0019] Figure 3 This is a schematic diagram of the sectional structure of the self-adjusting airflow exhaust duct for the fume hood of this utility model.

[0020] Figure 4This is a schematic diagram of the upper bearing cap structure of the exhaust duct for the self-adjusting airflow of the fume hood according to this utility model.

[0021] Figure 5 This is a schematic diagram of the lower bearing cap structure of the exhaust duct for the self-adjusting airflow of the fume hood according to this utility model.

[0022] In the diagram, 100 is the duct, 110 is the upper bearing cap, 111 is the knob, 112 is the partition, and 120 is the lower bearing cap.

[0023] 200-Control valve, 210-Valve plate one, 211-Rotating shaft, 212-Sponge sleeve one, 213-Oil injection hole, 214-Slanted oil passage one, 215-Fixing hole, 216-Internal thread groove, 217-Slanted oil passage two, 218-Sponge sleeve two, 220-Valve plate two, 230-Valve plate three, 240-Transmission connecting rod. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] As the first embodiment of this utility model:

[0026] Please see Figures 1 to 5 The exhaust duct for the fume hood with self-regulating airflow includes: duct 100, a control valve 200 movably installed inside the duct 100 for controlling the airflow speed inside the duct 100, multiple upper bearing caps 110 installed on the upper side of the duct 100, and multiple lower bearing caps 120 installed on the lower side of the duct 100.

[0027] The control valve 200 includes a first valve plate 210, a second valve plate 220, and a third valve plate 230. These three valve plates are rotatably installed inside the duct 100 in a left-to-right sequence. Each valve plate is rotatably installed inside the duct 100 via a rotating shaft 211. A transmission link 240 is installed between the front sides of the first valve plate 210 and the second valve plate 220, and between the rear sides of the second valve plate 220 and the third valve plate 230, respectively, to drive the first valve plate 210 and the third valve plate 230 to rotate with the second valve plate 220. In actual use, the upper end of the rotating shaft 211 on the second valve plate 220 extends upwards through the top of the duct 100 and is rotatably and sealingly connected to it, extending outwards... Part of the rotating shaft 211 is connected to the driver installed on the top of the air duct 100. The driver is equipped with a servo motor and a right-angle reducer to drive the rotating shaft 211 on the valve plate 220 counterclockwise or clockwise to achieve the effect of opening or closing. The upper bearing cap 110 is also installed on the upper side of the rotating shaft 211 on the valve plate 220. However, the upper end of the rotating shaft 211 passes through the upper bearing cap 110 located at the top of the air duct 100. The rest of the structure is the same as the upper bearing cap 110 in other positions. The through part is connected by the rotating shaft 211 in a sealed connection manner. Oil can be injected normally into it. The upper bearing cap 110 is located at the bottom of the driver housing. The driver side is reserved with an oil filling hole. Oil is injected by hose.

[0028] The top of the upper bearing cap 110 and the bottom of the lower bearing cap 120 are respectively threaded with a knob 111 for sealing the oil filling hole and the drain hole. A partition 112 is provided inside the upper side of the upper bearing cap 110.

[0029] The upper part of the partition plate 112 of the upper bearing cap 110 is provided with an oil storage cavity, and the partition plate 112 is provided with a rotating hole in the middle for rotating connection with the upper end of the rotating shaft 211.

[0030] Specifically, by setting the upper bearing cap 110 and the lower bearing cap 120, a sealing aid can be provided for the connection between the rotating shaft 211 and the air duct 100. In actual use, lubricating oil can be injected into the upper bearing cap 110 in advance. Under the action of gravity, the lubricating oil enters the oil injection hole 213 of the rotating shaft 211. After further movement, it provides lubrication for the bearings installed on the upper and lower sides of the rotating shaft 211, making the rotating shaft 211 rotate very smoothly and avoiding corrosion of the rotating parts due to long-term exposure to harsh environments. This ensures that the entire control valve 200 can operate freely. The lower bearing cap 120 can receive the excess lubricating oil and continuously lubricate the bearings on the lower side of the rotating shaft 211.

[0031] As a second embodiment of this utility model:

[0032] Please see Figures 1 to 5The upper end of the rotating shaft 211 is provided with an oil injection hole 213 facing downward. The lower end of the oil injection hole 213 does not penetrate the lower end of the rotating shaft 211. The upper outer wall of the rotating shaft 211 is provided with an inclined oil passage 214 facing upward. The inner end of the inclined oil passage 214 is connected to the upper part of the oil injection hole 213.

[0033] A sponge sleeve 212 is fitted on the upper outer wall of the rotating shaft 211, and the sponge sleeve 212 does not rotate with the rotating shaft 211. The lower end of the inclined oil passage 214 is placed inside the sponge sleeve 212.

[0034] A fixing hole 215 is formed by the middle of the rotating shaft 211 extending backward, and an internal thread groove 216 is provided on the inner wall of the fixing hole 215.

[0035] An inclined oil passage 217 is provided at the lower end of the oil injection hole 213 in the direction of the lower side of the outer wall of the rotating shaft 211. The upper end of the inclined oil passage 217 is flush with the bottom of the oil injection hole 213.

[0036] A second sponge sleeve 218 is fitted on the lower outer wall of the rotating shaft 211. The second sponge sleeve 218 does not rotate with the rotating shaft 211. The second sponge sleeve 218 is placed inside the upper side of the lower bearing cap 120. The outer end of the second inclined oil passage 217 is placed inside the second sponge sleeve 218. In actual use, by setting the rotating shaft 211, the first inclined oil passage 214 and the second inclined oil passage 217 on it provide lubricating oil to the bearings at the top and bottom of the rotating shaft 211. It needs to be disassembled for lubrication and oil filling, which facilitates subsequent maintenance and avoids the movement being impaired due to the reduction of lubricating oil after long-term use.

[0037] Based on the first embodiment described above, in actual use, the lubricating oil enters through the oil injection hole 213 on the upper side of the rotating shaft 211. Since the inner parts of the first inclined oil passage 214 and the second inclined oil passage 217 are connected to the inside of the oil injection hole 213, the lubricating oil inside the oil injection hole 213 can flow through the first inclined oil passage 214 and the second inclined oil passage 217 to the upper and lower outer walls of the rotating shaft 211. Furthermore, since a sponge sleeve 212 is fitted on the upper and lower outer walls of the rotating shaft 211 respectively, the lubricating oil inside the oil injection hole 213 can flow through the first inclined oil passage 214 and the second inclined oil passage 217 to the upper and lower outer walls of the rotating shaft 211. Sponge sleeve 218, sponge sleeve 212, and sponge sleeve 218 continuously absorb lubricating oil to provide continuous lubrication for the upper and lower bearings. This allows the rotating shaft 211 to maintain a high degree of rotational freedom and prevents it from rusting or getting stuck due to dust accumulation in a humid or dusty environment, thus avoiding loss of adjustment ability. Sponge sleeve 212 and sponge sleeve 218 also have a certain isolation effect, making it difficult for moisture and dust to enter the bearing, ensuring that the entire control valve 200 can operate flexibly.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. Fume hood exhaust ducts with self-regulating fan speed, including: The air duct (100) is characterized in that a control valve (200) is movably installed inside the air duct (100) for controlling the air flow speed inside the air duct (100), and a plurality of upper bearing caps (110) are installed on the upper side of the air duct (100) and a plurality of lower bearing caps (120) are installed on the lower side of the air duct (100). The control valve (200) includes a valve plate one (210), a valve plate two (220), and a valve plate three (230). The valve plate one (210), valve plate two (220), and valve plate three (230) are rotatably installed inside the air duct (100) in a left-to-right order. The valve plate one (210), valve plate two (220), and valve plate three (230) are all rotatably installed inside the air duct (100) via a rotating shaft (211). A transmission link (240) for driving the valve plate one (210) and valve plate three (230) to rotate with the valve plate two (220) is installed between the front sides of the valve plate one (210) and valve plate two (220) and between the rear sides of the valve plate two (220) and valve plate three (230).

2. The self-regulating exhaust duct for a fume hood as described in claim 1, characterized in that: The top of the upper bearing cap (110) and the bottom of the lower bearing cap (120) are respectively threaded with a knob (111) for sealing the oil filling hole and the discharge hole. A partition (112) is provided inside the upper side of the upper bearing cap (110).

3. The self-regulating exhaust duct for a fume hood as described in claim 2, characterized in that: The upper part of the partition (112) of the upper bearing cap (110) is provided with an oil storage cavity, and the partition (112) is provided with a rotating hole in the middle for rotating connection with the upper end of the rotating shaft (211).

4. The self-regulating exhaust duct for a fume hood as described in claim 3, characterized in that: The upper end of the rotating shaft (211) is provided with an oil injection hole (213) facing downward. The lower end of the oil injection hole (213) does not penetrate the lower end of the rotating shaft (211). The upper outer wall of the rotating shaft (211) is provided with an inclined oil passage (214) facing upward. The inner end of the inclined oil passage (214) is connected to the upper part of the oil injection hole (213).

5. The self-regulating exhaust duct for a fume hood as described in claim 4, characterized in that: The upper outer wall of the rotating shaft (211) is fitted with a sponge sleeve (212), and the sponge sleeve (212) does not rotate with the rotating shaft (211). The lower end of the inclined oil passage (214) is placed inside the sponge sleeve (212).

6. The exhaust duct (100) for a fume hood with self-regulating air velocity as described in claim 1, characterized in that: The rotating shaft (211) extends backward through the middle to form a fixing hole (215), and the inner wall of the fixing hole (215) is provided with an internal thread groove (216).

7. The exhaust duct for a fume hood with self-adjusting air velocity as described in claim 4, characterized in that: The lower end of the oil injection hole (213) is provided with an inclined oil passage (217) in the direction of the lower side of the outer wall of the rotating shaft (211), and the upper end of the inclined oil passage (217) is flush with the bottom of the oil injection hole (213).

8. The self-regulating exhaust duct for a fume hood as described in claim 7, characterized in that: The lower end of the rotating shaft (211) is fitted with a sponge sleeve (218), and the sponge sleeve (218) does not rotate with the rotating shaft (211). The sponge sleeve (218) is placed inside the upper side of the lower bearing cap (120), and the outer end of the inclined oil passage (217) is placed inside the sponge sleeve (218).

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