CN210497595U

CN210497595U - Device for controlling opening of air valve of ventilation cabinet door

Info

Publication number: CN210497595U
Application number: CN201921182724.7U
Authority: CN
Inventors: 郭俊宏
Original assignee: Tianjin Ouneng Electric Co ltd
Current assignee: Tianjin Ouneng Electric Co ltd
Priority date: 2019-07-15
Filing date: 2019-07-25
Publication date: 2020-05-12
Anticipated expiration: 2029-07-25
Also published as: CN111330933A

Abstract

The utility model discloses a device that fume chamber cabinet door control blast gate was opened, including cabinet door, cabinet door counter weight, first drive wheel, second drive wheel, derailleur and blast gate, the cabinet door passes through chain or hold-in range or wire rope with the cabinet door counter weight and links to each other, chain or hold-in range or wire rope carry out the transmission with first drive wheel and are connected, and first drive wheel passes through the derailleur and is connected with the second drive wheel, and the second drive wheel is connected with the drive wheel transmission on the valve rod. When the cabinet door is pulled, the chain or the synchronous belt or the steel wire rope drives the first driving wheel to rotate, the speed is reduced by the speed changer, the second driving wheel is enabled to run, and then the second driving wheel drives the air valve rod to rotate, so that the air volume of the ventilation cabinet is controlled. The device is simple, practical and safe to control, and overcomes the defects that the VAV variable air volume control of the existing fume hood is only controlled by electric drive and is not controlled by mechanical drive.

Description

Device for controlling opening of air valve of ventilation cabinet door

Technical Field

The utility model belongs to the technical field of experimental facilities, concretely relates to device that fume chamber cabinet door control blast gate was opened.

Background

At present, two types of known VAV variable air volume control of a fume hood are provided, one type adopts a special surface air velocity sensor for the fume hood to control the air velocity in real time

Measuring the air speed of the ventilation cabinet surface, and controlling the opening of the valve to be constant within the range of the safe airflow value by taking the air speed of the ventilation cabinet surface as a constant; the other method is to calculate the air exhaust quantity value required by the current fume hood according to the measured value of the door height sensor and the set surface air speed value, so as to control the air quantity of the variable air quantity butterfly valve to meet the requirement of the air exhaust quantity of the fume hood.

The common characteristics of two kinds of VAV variable air volume control are that the electric elements are provided with an electric control box, an electric actuator, a control display screen, a measuring sensor and the like, the installation is complex, the cost is high, the popularization and the application of the VAV variable air volume control are seriously influenced, and the VAV variable air volume control device can not be used in a chemical laboratory with combustible explosive gas.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a device that fume chamber cabinet door control blast gate was opened, the device need not electric control, simple structure, and low cost can be used to combustible explosive gas's chemistry experiment room, suitable popularization.

The utility model discloses a realize through following technical scheme:

the utility model provides a device that fume chamber cabinet door control blast gate was opened, includes cabinet door, cabinet door counter weight, first drive wheel, second drive wheel, derailleur and blast gate, the cabinet door passes through chain or hold-in range or wire rope with cabinet door counter weight and links to each other, chain or hold-in range or wire rope carry out the transmission with first drive wheel and are connected, and first drive wheel passes through the derailleur and is connected with the second drive wheel, and the second drive wheel is connected with the drive wheel transmission on the valve rod. When the cabinet door is pulled, the chain or the synchronous belt or the steel wire rope drives the first driving wheel to rotate, the speed is reduced by the speed changer, the second driving wheel is enabled to run, and then the second driving wheel drives the air valve rod to rotate, so that the air volume of the ventilation cabinet is controlled.

In the technical scheme, the driving wheel is connected with the valve counterweight through the connecting rod, and the valve counterweight provides restoring force for the driving wheel to ensure that the air valve can reset.

In the above technical solution, the first driving wheel is a sprocket, a pulley, or a reel.

In the above technical solution, the transmission is a speed reducer, the first transmission wheel is mounted on an input shaft of the speed reducer, and the second transmission wheel is mounted on an output shaft of the speed reducer.

In the technical scheme, the second transmission wheel is connected with the driving wheel on the valve rod of the valve through a steel wire pull wire.

In the above technical solution, the second transmission wheel is preferably a cam, and the outer contour of the cam has a limiting groove for limiting the wire pulling wire not to slide out of the cam.

In the technical scheme, the sleeve is sleeved outside the steel wire stay wire.

In the technical scheme, the two ends of the sleeve are respectively provided with the fixing parts to limit the track of the steel wire stay wire.

In the technical scheme, the circumference of the driving wheel is provided with a limiting groove for limiting the steel wire stay wire not to slide out of the driving wheel.

The utility model discloses an advantage and beneficial effect do: the existing air quantity control is mostly electric control, the number of elements is large, the device is complex, the manufacturing cost is high, the popularization and the application of VAV variable air quantity control are seriously influenced, and the device can not be used in a chemical laboratory with combustible and explosive gas. The device does not need electric control, has simple structure and low cost, can be used in a chemical laboratory of combustible and explosive gas and is suitable for popularization.

Drawings

Fig. 1 is a front view of the present invention;

fig. 2 is a left side view of the present invention;

FIG. 3 is a schematic view of the cam and drive wheel driving the dampers closed;

FIG. 4 is a schematic view of the cam and drive wheel drive damper opening;

FIG. 5 is a front view of the cam;

FIG. 6 is a side view of the cam;

fig. 7 is a graph of the damper characteristic.

Wherein:

1: driving wheel, 2: air valve, 3: steel wire stay, 4: cam, 4-1: limiting groove, 4-2: projection, 5: speed reducer, 6: sprocket, 7: valve stem, 8: chain, 9: cabinet door, 10: cabinet door counterweight, 11: sleeve, 12: valve counterweight, 13: connecting rod, 14: and a fixing member.

For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.

Detailed Description

In order to make the technical field person understand the solution of the present invention better, the technical solution of the present invention is further described below with reference to the specific embodiments.

Example one

A device for controlling an air valve to open through a cabinet door of a ventilation cabinet comprises a cabinet door 9, a chain 8, a chain wheel 6, a speed reducer 5, a cam 4 and an air valve 2.

The cabinet door 9 is connected with one end of the chain 8, and the other end of the chain 8 is connected with a cabinet door counterweight 10 positioned at the rear side of the fume hood by bypassing the chain wheel 6; the chain wheel 6, the speed changer 5 and the cam 4 are arranged at the top of the fume hood, the chain wheel 6 is arranged on an input shaft of the speed reducer 5, the cam 4 is arranged on an output shaft of the speed reducer 5, and the speed changer 5 is used for slowing down the rotating speed of the cam 4 and reducing the stroke of the cam 4; the air valve 2 is arranged in an air exhaust channel at the top of the fume hood, a driving wheel 1 is arranged on a valve rod 7 of the air valve 2, the driving wheel 1 is connected with the cam 4 through a steel wire pull wire 3, so that the cam 4 can pull the driving wheel 1 to rotate through the steel wire pull wire 3, the driving wheel 1 further drives the valve rod of the air valve 2 to rotate, and the flux of the air valve 2 is controlled; further, the driving wheel 1 is connected with a valve counterweight 12 through a connecting rod 13, and the valve counterweight 12 provides restoring force for the driving wheel 1 to ensure that the air valve 2 can reset.

The working mode is as follows:

with cabinet door 9 upwards opening, cabinet door counter weight 10 moves downwards in step, and drive sprocket 6 is rotatory under the effect of chain 8, and drive reduction gear 5 takes place to rotate simultaneously, drives cam 4 clockwise rotation then. The cam 4 pulls the steel wire pull wire 3, and the steel wire pull wire 3 drives the driving wheel 1 to rotate clockwise, so that the valve rod 7 rotates, the air valve 2 is opened, and the ventilation volume is gradually increased.

When closing cabinet door 9, cabinet door 9 descends, and cabinet door counter weight 10 is along with rising, and sprocket 6 is rotatory under the effect of chain 8, and drive reduction gear 5 takes place to rotate simultaneously, drives cam 4 anticlockwise rotation then. The steel wire pull wire 3 is loosened to release the restraint on the valve driving wheel 1, the driving wheel 1 rotates anticlockwise under the action of the valve counterweight 12 to enable the air valve 2 to be gradually closed, and the ventilation quantity is gradually reduced.

Example two

The embodiment is further optimized on the basis of the first embodiment.

Preferably, a sleeve 11 is sleeved outside the wire drawing 3, and fixing members 14 are respectively disposed at two ends of the sleeve 11 for fixing the wire sleeve 11 and limiting the trajectory of the wire drawing.

Preferably, referring to fig. 6, the outer profile of the cam 4 has a limiting groove 4-1 for limiting the wire 3 not to slide out of the cam 4; the cam 4 has a boss 4-2 at the center thereof, and the boss 4-2 has a through hole at the center thereof for mounting the cam 4 with the output shaft of the decelerator 5.

Preferably, the outer end of the connecting rod 13 is rotatably connected to the valve weight 12, so that the valve weight 12 is in a vertical direction when the valve driving wheel 1 is lifted.

Preferably, the outer contour of the driving wheel 1 also has a limiting groove for limiting the steel wire 3 not to slide out of the driving wheel 1.

EXAMPLE III

The embodiment is further optimized on the basis of the embodiment.

The shape of the cam needs to be determined according to the characteristic curve of the air valve under the condition that the negative pressure value of the laboratory pipeline is relatively stable and by combining laboratory test data calibration, so that VAV variable air volume accurate control of the fume hood is realized.

Referring to the attached figure 7, the air valve characteristic curve shows that the air volume change of the valve opening angle is fastest from 30 degrees to 70 degrees, and is gentle when the valve is just opened and close to full opening, so that the cam adopts an elliptical structure, and meanwhile, the change rate of the air volume of 0-20 degrees just opened is found to be very small, so that the cam is designed into a non-standard ellipse and is calibrated by combining with test data of an air volume cover of a laboratory, and the air volume cover meets the ventilation safety standard of the laboratory.

The following table is a table of laboratory use measurement data:

remarking: considering the air leakage of the air cabinet, when the displacement of the door is the minimum opening, the minimum opening of the valve is 10 degrees, and when the negative pressure of the air pipe is 150Pa, the current characteristics are very suitable for the 1.8-meter air cabinet. Is suitable for the wind cabinet with the negative pressure of 100-200Pa1.8 meters of the wind pipe.

Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.

The invention has been described above by way of example, and it should be noted that any simple variants, modifications or other equivalent substitutions by a person skilled in the art without spending creative effort may fall within the scope of protection of the present invention without departing from the core of the present invention.

Claims

1. The utility model provides a device that fume chamber cabinet door control blast gate was opened which characterized in that: the cabinet door is connected with the cabinet door counterweight through a chain or a synchronous belt or a steel wire rope, the chain or the synchronous belt or the steel wire rope is in transmission connection with the first driving wheel, the first driving wheel is connected with the second driving wheel through the transmission, and the second driving wheel is in transmission connection with a driving wheel on a valve rod of the valve.

2. The device for controlling the opening of the air valve of the fume hood door according to claim 1, wherein: the drive wheel is connected with the valve counter weight through the connecting rod, and the valve counter weight provides the restoring force for the drive wheel, guarantees that the blast gate can reset.

3. The device for controlling the opening of the air valve of the fume hood door according to claim 1, wherein: the first driving wheel is a chain wheel or a belt wheel or a winding wheel.

4. The device for controlling the opening of the air valve of the fume hood door according to claim 1, wherein: the speed changer is a speed reducer, the first driving wheel is arranged on an input shaft of the speed reducer, and the second driving wheel is arranged on an output shaft of the speed reducer.

5. The device for controlling the opening of the air valve of the fume hood door according to claim 1, wherein: the second driving wheel is connected with a driving wheel on the valve rod of the valve through a steel wire pull wire.

6. The device for controlling the opening of the air valve of the fume hood door according to claim 5, wherein: the second driving wheel is a cam.

7. The device for controlling the opening of the air valve of the fume hood door according to claim 6, wherein: the outer contour of the cam is provided with a limit groove for limiting the steel wire pull wire not to slide out of the cam.

8. The device for controlling the opening of the air valve of the fume hood door according to claim 5, wherein: the outer sleeve of the steel wire stay wire is provided with a sleeve.

9. The apparatus of claim 8 for controlling opening of a damper on a fume hood door, wherein: the two ends of the sleeve are respectively provided with a fixing part for limiting the track of the steel wire stay wire.