CN212419036U - Fume hood - Google Patents

Abstract

The utility model relates to a fume hood, it includes the show body, shows internal operation chamber that has seted up, and one side of operation chamber is the opening setting that communicates each other with the external world, and operation chamber opening part is provided with the isolation window, show body top is provided with a suction box, and the suction box communicates each other with the operation chamber, is provided with an air exhauster in the suction box, and one side intercommunication that the suction box deviates from the working chamber has a blast pipe, still be provided with fixed point updraft ventilator in the operation chamber, fixed point updraft ventilator is articulated on the first articulated arm including articulating the first articulated arm on the operation intracavity wall, and articulated on the first articulated arm has a second articulated arm, and ball joint has a fixing base on the second articulated arm, installs an aspiration channel in the fixing base, and the aspiration channel is the hose, and the aspiration channel keeps. The utility model discloses have the effect that improves waste gas absorption efficiency.

Description

Fume hood

Technical Field

The utility model belongs to the technical field of laboratory ventilation equipment's technique and specifically relates to a fume hood is related to.

Background

Fume hoods, also known as fume hoods, are large devices used in chemical laboratories to reduce the exposure of laboratory personnel to harmful gases. Fume hoods are primary barriers to protect personnel from toxic chemical fumes and can be used as important safety backup devices, such as to effectively exhaust harmful gases during chemical process failures, chemical fumes, dust, and toxic gases, to protect personnel and the laboratory environment.

Chinese patent publication No. CN106944447A discloses a fume hood, which includes a hood body, the hood body has a cavity, the hood body has an opening connected with the cavity, the opening is hinged with a sealed door, a placing plate for placing a reaction container is horizontally arranged in the cavity of the hood body, a ventilating box is fixed on the inner top wall of the hood body, the ventilating box has an inner cavity, an air outlet square hole communicated with the inner cavity of the ventilating box is arranged at the upper end of the ventilating box, the air outlet square hole on the ventilating box is communicated with an installation square hole on the hood body, an air inlet square hole i, an air inlet square hole ii, an air inlet square hole iii and an air inlet square hole iv are respectively arranged on four side surfaces of the ventilating box, a hollow top cover is fixed on the upper surface of the hood body, a cover plate is arranged on the top cover plate, and an air outlet hole is arranged on the cover plate.

However, in the experimental process, because the heights and sizes of different experimental instruments are different, the experimental scales of the experimental instruments are different, and the existing fume hood cannot perform fixed-point air draft on the instrument generating waste gas, so that the absorption efficiency of the waste gas is not high.

SUMMERY OF THE UTILITY MODEL

To the not enough of prior art existence, the utility model aims at providing a fume hood, it has the effect that improves waste gas absorption efficiency.

The above object of the present invention can be achieved by the following technical solutions:

a fume hood comprises a hood body, an operation cavity is arranged in the hood body, an opening communicated with the outside is arranged on one side of the operation cavity, an isolation window is arranged at the opening of the operation cavity, a wind-pumping box is arranged above the hood body and communicated with the operation cavity, an exhaust fan is arranged in the wind-pumping box, an exhaust pipe is communicated with one side of the wind-pumping box, which is far away from a working cavity, and a fixed-point air draft device is also arranged in the operation cavity,

the fixed-point air draft device comprises a first hinged arm hinged to the inner wall of the operation cavity, a second hinged arm is hinged to the first hinged arm, a fixing seat is hinged to the second hinged arm in a ball joint mode, an air draft tube is installed in the fixing seat and is a hose, and one end, far away from the fixing seat, of the air draft tube is communicated with the air draft tube.

Through adopting above-mentioned technical scheme, when the fixed point convulsions subassembly that the staff used, because first articulated arm is articulated each other with the otic placode, second articulated arm is articulated each other with first articulated arm, second articulated arm and fixing base ball joint, thereby make the fixing base can remove in the certain extent, the staff can control the fixing base and remove near the bottleneck that produces waste gas to the instrument, and carry out fixed point convulsions to the waste gas that produces, thereby improved the extraction efficiency to waste gas, reduced the condition that waste gas leaked.

The present invention may be further configured in a preferred embodiment as: an ear plate is fixedly connected to the top wall of the operation cavity, a first screw rod penetrates through the ear plate, the axial direction of the first screw rod is parallel to the top wall of the operation cavity, the first screw rod penetrates through the first hinge arm and is rotatably connected with the first hinge arm, and a first clamping nut is further sleeved on the first screw rod; the one end rigid coupling that the otic placode was kept away from to first articulated arm has the second screw rod, and the axial of second screw rod is on a parallel with the axial setting of first screw rod, and the second screw rod passes the second articulated arm and rotates with the second screw rod to be connected, and screw-thread fit has one to be used for the fixed second clamping nut of second articulated arm and second articulated arm on the second screw rod.

Through adopting above-mentioned technical scheme, the staff revolves soon first clamping nut in proper order, second clamping nut to with first articulated arm, second articulated arm reciprocal anchorage, and then with the rigidity of fixing base, improved the stability of fixed point convulsions subassembly work. When need not use fixed point convulsions subassembly, the staff can be with first clamping nut, the first screw rod is followed respectively to second clamping nut, unscrews on the second screw rod to dismantle first articulated arm and second articulated arm from the otic placode, improved the convenience of dismantling, reduced the space of operating the intracavity and taken, made things convenient for and built complicated instrument subassembly in the department of ventilating.

The present invention may be further configured in a preferred embodiment as: the first clamping nut and the second clamping nut are both butterfly nuts.

Through adopting above-mentioned technical scheme, the setting of butterfly nut for the staff can directly twist first clamping nut and second clamping nut with the hand. Thereby improving the convenience of operation.

The present invention may be further configured in a preferred embodiment as: the utility model discloses a connector, including the suction pipe, the lateral wall of fixing base, screw internal thread fit have a fastening screw, in the connector inserts into the through-hole, fastening screw's tip top touched on the outer peripheral face of connector, the suction pipe has a connector towards the tip intercommunication rigid coupling of fixing base, has seted up a through-hole that holds the connector and pass on the fixing base, has seted up a screw to through-hole department on the lateral wall of fixing base, screw internal thread.

Through adopting above-mentioned technical scheme, the screw-thread fit of top contact screw and screw has made things convenient for the dismantlement between connector and the fixing base, and then conveniently washs and changes the suction line.

The present invention may be further configured in a preferred embodiment as: the roof of operation chamber is seted up one and is held aspiration channel male connector, the other end and the exhaust box interconnect of connector, and the port department that the connector is located the exhaust box covers and is equipped with an auxiliary fan.

By adopting the technical scheme, the auxiliary fan further improves the suction force inside the suction pipe, so that the suction capacity of the connecting head to waste gas is improved, and the influence on the suction force of the suction pipe due to the overlong length of the suction pipe is reduced.

The present invention may be further configured in a preferred embodiment as: the air suction pipe is a corrugated pipe.

Through adopting above-mentioned technical scheme, the aspiration channel is the setting of bellows, because the bellows itself has better tensile bending property to the adjustment of cooperation fixing base position that can be better.

The present invention may be further configured in a preferred embodiment as: the isolating window is provided with a control opening, a control door is hinged to the control opening, and the control door is provided with a magnetic suction assembly for fixedly adsorbing the control door and the isolating window;

the magnetic attraction component comprises an iron attraction fixed on the isolation window, and iron sheets matched with the iron attraction to adsorb are fixed on the corresponding control window.

Through adopting above-mentioned technical scheme, when the staff need add the medicine to the instrument in the reaction, the staff can push away two control doors respectively with both hands and stretch into the operation intracavity portion and operate to need not open the isolation window completely, reduced the condition of leaking to influencing staff operational environment in the room of waste gas. The setting of subassembly is inhaled to magnetism has improved the convenience that the control door established control flap to the control door can directly push open when using, thereby has made things convenient for staff's use.

The present invention may be further configured in a preferred embodiment as: the articulated shaft is sleeved with a torsional spring on the control door, one end of the torsional spring is fixedly connected with the control door and the other end of the torsional spring is fixedly connected with the isolation window, and the torsional spring drives the control door to close the control opening in a natural state.

Through adopting above-mentioned technical scheme, the setting of torsional spring for the control door can rotate automatically under the elastic force of torsional spring, and close the control port, thereby improved the convenience that the control door used.

To sum up, the utility model discloses a following at least one useful technological effect:

the efficiency of waste gas absorption is improved, and by the arrangement of the fixed-point air draft assembly, waste gas generated at the port of the instrument can be directly pumped away by the fixed-point air draft assembly, so that the condition of waste gas leakage is reduced;

2. the waste gas leakage amount to the indoor is reduced when the instrument is operated, and workers can operate the instrument through the control door, so that the isolation window does not need to be completely opened, and the waste gas leakage condition is reduced.

Drawings

Figure 1 is a schematic view of the overall structure of a fume hood and illustrates the internal structure of a suction box;

FIG. 2 is a sectional view showing the construction of an operation chamber at a vent;

FIG. 3 is an enlarged view of detail A of FIG. 2, and shows a spot draft assembly;

fig. 4 is a schematic view of the control door as viewed from the operation chamber side.

In the figure, 1, a cabinet body; 11. an operating chamber; 111. an air exhaust hole; 112. a connecting port; 12. a slide rail; 2. an isolation window; 21. a frame; 22. monitoring the glass; 23. a control port; 24. a control gate; 25. a magnetic component; 26. iron sheets; 27. iron absorption; 28. a torsion spring; 3. an air extraction box; 31. an exhaust fan; 32. an exhaust pipe; 33. an air purifier; 4. a fixed-point air draft assembly; 41. an ear plate; 411. a first screw; 412. a first clamping nut; 42. a first hinge arm; 421. a second screw; 422. a second clamping nut; 43. a second hinge arm; 44. a fixed seat; 441. a through hole; 442. a screw hole; 443. fastening screws; 45. an air suction pipe; 46. a connector; 47. an auxiliary fan.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, for the utility model discloses a fume hood, including the cupboard body 1, offer an operation chamber 11 in the cupboard body 1, one side of operation chamber 11 is the opening setting, and each rigid coupling has a slide rail 12 on two vertical lateral walls that operation chamber 11 is located the opening part, the vertical setting of length direction of slide rail 12 to two slide rails 12 are laid in opposite directions, still slide jointly between two slide rails 12 and be connected with an isolation window 2. The insulating window 2 can be slid in the vertical direction to close the opening. In the embodiment, the slide rail 12 is a damping slide rail 12, so that the isolation window 2 can hover at any position of the slide rail 12. An air extracting box 3 is fixedly connected above the cabinet body 1, and an exhaust fan 31 is fixedly connected in the air extracting box 3. The top wall of the operation cavity 11 is provided with a plurality of air exhaust holes 111, and the air exhaust holes 111 communicate the operation cavity 11 with the air exhaust box 3. An exhaust pipe 32 is connected to the top wall of the air-extracting box 3, and the exhaust pipe 32 can exhaust the gas in the operation chamber 11 to the outside. An air purifier 33 is further connected to an end of the exhaust pipe 32 away from the air pumping box 3 for purifying the exhausted waste gas.

As shown in fig. 2 and fig. 3, a fixed point air draft assembly 4 for fixed point absorption at the port of the test instrument generating waste gas is further disposed at the top of the operation cavity 11, and a connection port 112 is disposed at the bottom wall of the operation cavity 11. The spot draft assembly 4 includes an ear plate 41, a first hinge arm 42, a second hinge arm 43, and a mounting base 44. The ear plate 41 is fixedly connected to the top wall of the operation chamber 11 and located at the edge of the connection port 112, a first screw 411 is vertically fixedly connected to the ear plate 41, an axis of the first screw 411 is perpendicular to the length direction of the first hinge arm 42, the axial direction of the first screw 411 is parallel to the top wall of the operation chamber 11, the first screw 411 passes through the first hinge arm 42 and is rotatably connected with the first hinge arm 42, and a first clamping nut 412 is screwed on the first screw 411. A second screw 421 is fixedly connected to one end of the first hinge arm 42 away from the ear plate 41, the axial direction of the second screw 421 is parallel to the axial direction of the first screw 411, and the second hinge arm 43 is sleeved on the second screw 421 and is rotatably connected with the second screw 421; a second clamping nut 422 is screwed on the second screw 421. The end of the second hinge arm 43 away from the second screw 421 is ball-hinged to the fixing seat 44. The fixing base 44 is provided with a through hole 441. The fixed point air draft assembly 4 further comprises an air draft tube 45 communicated with the connecting port 112 and a connecting head 46 communicated with the air draft tube 45. In this embodiment, the air suction pipe 45 is a corrugated pipe, the air suction pipe 45 is inserted into the connection port 112, and the raised edge of the air suction pipe 45 is fixed to the edge of the connection pipe. The outer side wall of the fixing base 44 is provided with a screw hole 442 toward the through hole 441, and the screw hole 442 is internally threaded with a fastening screw 443. When the connection head 46 is inserted into the through hole 441, the worker may screw the fastening screw 443 so that the end of the fastening screw 443 abuts against the outer circumferential surface of the connection head 46, thereby fixing the connection head 46 and the fixing seat 44 to each other. An auxiliary fan 47 is further fixedly connected to the connecting port 112 in the air suction box 3, the auxiliary fan 47 further improves the suction force inside the air suction pipe 45, so that the suction capacity of the connector 46 on waste gas is improved, and the influence on the suction force of the air suction pipe 45 due to the overlong length of the air suction pipe 45 is reduced.

When the fixed point convulsions subassembly 4 that the staff used, because first articulated arm 42 and otic placode 41 are articulated each other, second articulated arm 43 and first articulated arm 42 are articulated each other, second articulated arm 43 and fixing base 44 ball joint, thereby make fixing base 44 can remove in the certain limit, the staff can control fixing base 44 to remove near the bottleneck that the instrument produced waste gas, then the staff revolves first clamping nut 412 in proper order, second clamping nut 422, thereby with first articulated arm 42, second articulated arm 43 reciprocal anchorage, and then fix fixing base 44 above the bottleneck, and carry out fixed point convulsions to the waste gas that produces, thereby improved the extraction efficiency to waste gas, the condition that the waste gas leaked has been reduced. The first clamping nut 412 and the second clamping nut 422 are both configured as wing nuts, so that a worker can directly screw the first clamping nut 412 and the second clamping nut 422 by hand. Thereby improving the convenience of operation. The air suction pipe 45 is a corrugated pipe, and the corrugated pipe has good stretching and bending performance, so that the position of the fixed seat 44 can be well adjusted. The thread fit of the top contact screw and the screw hole 442 facilitates the detachment between the connector 46 and the fixing seat 44, and further facilitates the cleaning and replacement of the air suction pipe 45.

When the worker does not need to use the spot air extracting device, the worker can rotate the first hinge arm 42 and the second hinge arm 43 to the upper side of the operation cavity 11, and the top walls of the operation cavity 11 are attached to each other, so that the occupied space is reduced. The worker can also unscrew the first clamping nut 412 from the first screw 411, so that the first hinge arm 42 can be detached from the ear plate 41, the worker can also detach the first hinge arm 42 and the second hinge arm 43 from each other, and then the worker can detach the air suction pipe 45 from the connection port 112, so that the detachment of the fixed-point air draft assembly 4 as a whole is completed. When an instrument assembly with large occupied space needs to be connected and erected in the fume hood, the worker can detach the fixed-point air draft assembly 4, so that the occupied space of the fixed-point air draft assembly 4 is reduced, and the installation of an instrument is facilitated.

As shown in fig. 4, since operations such as adding chemicals are required in the experiment, if the worker directly opens the isolation window 2 at this time, a part of the exhaust gas in the fume hood may be dispersed indoors, in order to reduce this influence, the isolation window 2 includes a frame 21, a monitoring glass 22 is provided in the frame 21, the isolation window 2 is located on the frame 21 below, the frame 21 is bent upward to form a rectangular control opening 23, and two control openings 23 are provided along the horizontal direction. A control door 24 is hinged on the control opening 23, the hinge shaft of the control door 24 is vertically arranged, and the hinge shaft is positioned on one side of the control door 24 far away from the other control door 24. When the staff need add the medicine to the instrument in the reaction, the staff can push open two control doors 24 respectively with both hands and stretch into the operation chamber 11 inside and operate to need not to open the isolation window 2 completely, reduced the condition of leaking of waste gas to influence staff's operational environment in the room. One side of the control door 24 facing the isolation window 2 is provided with a magnetic component 25, the magnetic component 25 comprises an iron sheet 26 fixedly connected to the control door 24, a magnet 27 is fixedly connected to the frame 21 corresponding to the isolation window 2, and the control door 24 is covered on the control opening 23 by the mutual matching of the magnet 27 and the iron sheet 26, so that the control opening 23 is fixed. The magnetic attraction component 25 improves the convenience of covering the control opening 23 by the control door 24, and the control door 24 can be directly pushed open when in use, so that the use of workers is facilitated. Control door 24 is transparent organic glass material, and then has made things convenient for the staff to observe the fume hood inside condition through control door 24. A torsion spring 28 is further sleeved on the hinged shaft of the control door 24, one end of the torsion spring 28 is fixedly connected with the control door 24, and the other end is fixedly connected with the frame 21. The torsion spring 28 naturally drives the control door 24 to rotate and closes the control opening 23. The torsion spring 28 is arranged, so that the control door 24 can automatically rotate under the elastic force of the torsion spring 28, and the control opening 23 is closed, thereby improving the convenience of the control door 24.

The implementation principle of the embodiment is as follows: when a worker uses the fume hood, firstly, the exhaust fan 31 and the auxiliary fan 47 are opened, the fixing seat 44 is moved to a port of an experimental instrument, then the worker screws the first clamping nut 412 once, the second clamping nut 422 fixes the first hinge arm 42 and the second hinge arm 43 mutually, then the worker slides the isolation window 2 downwards and closes the opening of the operation cavity 11, so that toxic and harmful gas generated in the experiment can be exhausted from the ventilation position, the condition that the gas spreads in the laboratory and influences the internal environment of the laboratory is reduced, when the worker needs to add medicine into the experimental instrument, the worker can push the control door 24 open and operate the hand from the control opening 23 to go deep into the operation cavity 11, and after the operation is completed, the control door 24 is automatically closed under the action of the torsion spring 28 and is fixed by the magnetic attraction component 25.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (8)

1. The utility model provides a fume hood, includes show body (1), has seted up operation chamber (11) in show body (1), and one side of operation chamber (11) is the opening setting of intercommunication each other with the external world, and operation chamber (11) opening part is provided with isolation window (2), its characterized in that: an air pumping box (3) is arranged above the cabinet body (1), the air pumping box (3) is communicated with the operation cavity (11), an exhaust fan (31) is arranged in the air pumping box (3), one side of the air pumping box (3) departing from the working cavity is communicated with an exhaust pipe (32), a fixed-point air draft device is also arranged in the operation cavity (11),

fixed point updraft ventilator is including articulating first articulated arm (42) on operation chamber (11) inner wall, and articulated on first articulated arm (42) have second articulated arm (43), and the ball joint has a fixing base (44) on second articulated arm (43), installs in fixing base (44) an aspiration channel (45), and aspiration channel (45) are the hose, and the one end that fixing base (44) were kept away from in aspiration channel (45) communicates each other with air pumping box (3).

2. A fume hood according to claim 1 wherein: an ear plate (41) is fixedly connected to the top wall of the operation cavity (11), a first screw rod (411) penetrates through the ear plate (41), the axial direction of the first screw rod (411) is parallel to the top wall of the operation cavity (11), the first screw rod (411) penetrates through a first hinge arm (42) and is rotatably connected with the first hinge arm (42), and a first clamping nut (412) is further sleeved on the first screw rod (411); one end, far away from the ear plate (41), of the first hinge arm (42) is fixedly connected with a second screw rod (421), the axial direction of the second screw rod (421) is parallel to the axial direction of the first screw rod (411), the second screw rod (421) penetrates through the second hinge arm (43) and is rotatably connected with the second screw rod (421), and a second clamping nut (422) used for fixing the second hinge arm (43) and the second hinge arm (43) is in threaded fit on the second screw rod (421).

3. A fume hood according to claim 2 wherein: the first clamping nut (412) and the second clamping nut (422) are both butterfly nuts.

4. A fume hood according to claim 1 wherein: the utility model discloses an air suction pipe, including suction pipe (45), fixing base (44), screw hole (442) have been seted up to the through-hole (441) that the connector (46) passed on fixing base (44), a screw hole (442) has been seted up to through-hole (441) department on the lateral wall of fixing base (44), screw hole (442) interior screw-thread fit has a fastening screw (443), insert into through-hole (441) when connector (46), the tip top of fastening screw (443) touches on the outer peripheral face of connector (46).

5. A fume hood according to claim 1 wherein: the roof of operation chamber (11) is seted up one and is held aspiration channel (45) male connector (112), the other end and drawing bellows (3) interconnect of connector (112), and the port department that connector (112) are located drawing bellows (3) is covered and is equipped with an auxiliary fan (47).

6. A fume hood according to claim 1 wherein: the air suction pipe (45) is a corrugated pipe.

7. A fume hood according to claim 1 wherein: the isolating window (2) is provided with a control opening (23), the control opening (23) is hinged with a control door (24), and the control door (24) is provided with a magnetic attraction component (25) for attracting and fixing the control door (24) and the isolating window (2);

subassembly (25) are inhaled to magnetism includes that the rigid coupling inhales iron (27) on isolation window (2), corresponds on the control window rigid coupling have with inhale iron (27) iron sheet (26) of adsorbing of mutually supporting.

8. A fume hood according to claim 7 wherein: the articulated shaft is gone up in control door (24) and is overlapped and be equipped with a torsional spring (28), and the rigid coupling other end and isolation window (2) rigid coupling are gone up with control door (24) to the one end of torsional spring (28), and torsional spring (28) drive control door (24) are closed control mouth (23) under the natural state.

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