CN113751452A

CN113751452A - Laboratory fume chamber

Info

Publication number: CN113751452A
Application number: CN202110963663.3A
Authority: CN
Inventors: 孟惠平
Original assignee: Taizhou Innovation Technology Research Institute Co ltd
Current assignee: Taizhou Innovation Technology Research Institute Co ltd
Priority date: 2021-08-20
Filing date: 2021-08-20
Publication date: 2021-12-07
Anticipated expiration: 2041-08-20
Also published as: CN113751452B

Abstract

The invention provides a laboratory ventilation cabinet which comprises a cabinet body, wherein the cabinet body comprises an upper cabinet body and a lower cabinet body, a cavity is arranged in the upper cabinet body, and a door moving mechanism is arranged on the upper cabinet body; and the air exhaust assembly comprises a fan, the fan is positioned at the top end of the upper cabinet body, the fan is communicated with the cavity and the outside of the cabinet body, an air supply assembly is arranged in the upper cabinet body, and a variable resistance mechanism is arranged between the air supply assembly and the door moving mechanism. According to the invention, the air supply assembly is arranged to block an opening between the cabinet door and the operating platform by using the air wall, so that harmful gas generated in an experiment is prevented from injuring an experimenter. Meanwhile, the variable resistance mechanism is utilized to ensure that the force of the air wall sprayed out by the nozzle is large when the door moving mechanism is lifted and descended, thereby achieving the purpose of saving energy.

Description

Laboratory fume chamber

Technical Field

The invention relates to the technical field of waste gas treatment, in particular to a laboratory ventilation cabinet.

Background

Fume hoods are an integral part of laboratory ventilation design. In order for laboratory workers not to inhale or swallow some toxic, pathogenic or non-toxic chemicals and organisms, there should be good ventilation in the laboratory. The fume chamber in laboratory among the prior art generally is when the laboratory staff need do the experiment in the fume chamber, at first with the glass window fall to certain height, operating personnel can stretch into the fume chamber with the hand afterwards and carry out the chemistry experiment. But the distance between the glass test window and the cabinet body inevitably leaks gas, and the leaked gas can cause harm to experimenters.

Disclosure of Invention

This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.

Therefore, the technical problem to be solved by the invention is to overcome the defect that the gas in the fume hood in the prior art is easy to leak, thereby providing a laboratory fume hood.

In order to solve the technical problems, the invention provides the following technical scheme: a laboratory ventilation cabinet comprises a cabinet body, wherein the cabinet body comprises an upper cabinet body and a lower cabinet body, and a cavity is arranged in the upper cabinet body; and the air exhaust assembly comprises a fan, the fan is positioned at the top end of the upper cabinet body, and the fan is communicated with the cavity and the outside of the cabinet body.

As a preferable embodiment of the laboratory fume hood of the present invention, wherein: the improved sliding door structure is characterized in that a door moving mechanism is arranged on the upper cabinet body and comprises a first sliding door, a first cross rod, a second sliding door, a second cross rod and a lifting mechanism, the first sliding door is provided with the first cross rod at the lower end, the two side walls of the upper cabinet body are fixedly connected with the two ends of the first cross rod, the second sliding door is provided with the second cross rod at the upper end, the two side walls of the upper cabinet body are symmetrically provided with grooves, the two ends of the second cross rod are in sliding contact with the upper cabinet body in the grooves, and the lifting mechanism is connected to one side of the second cross rod.

As a preferable embodiment of the laboratory fume hood of the present invention, wherein: elevating system includes first motor and dwang, first motor is located the lower cabinet body, the first motor output shaft of dwang one end fixed connection, first motor one end is kept away from to the dwang stretch into the upper cabinet body from the lower cabinet body in with the upper cabinet body top rotate be connected, second horizontal pole one end is equipped with the through-hole, be equipped with the internal thread in the through-hole, the dwang surface is equipped with the external screw thread, the dwang from the through-hole in pass with second horizontal pole threaded connection.

As a preferable embodiment of the laboratory fume hood of the present invention, wherein: an air supply assembly is arranged in the upper cabinet body.

As a preferable embodiment of the laboratory fume hood of the present invention, wherein: the air supply assembly comprises a second motor, a fan, an inner flow channel and a nozzle, the second motor is arranged at the top end of the cabinet body, the second motor is fixedly connected with the fan through an output shaft, the air blowing port of the fan is connected with the air inlet of the inner flow channel, the inner flow channel is located in the inner wall of the cabinet body, one end, far away from the fan, of the inner flow channel is divided into a plurality of air outlets, the air outlets are arranged at the lower surface of the upper cabinet body in an equidistance mode, and the nozzle is arranged in each air outlet.

As a preferable embodiment of the laboratory fume hood of the present invention, wherein: the air outlets are located at the projection position of the second sliding door on the lower surface of the upper cabinet body, and the axis of the nozzle coincides with the axis of the air outlets.

As a preferable embodiment of the laboratory fume hood of the present invention, wherein: and a third cross rod is arranged at the lower end of the second sliding door, the third cross rod is parallel to the second cross rod, and an inclined plane is arranged on one side, far away from the second cross rod, of the third cross rod.

As a preferable embodiment of the laboratory fume hood of the present invention, wherein: and a resistance-variable mechanism is arranged at the joint of the door-moving mechanism and the upper cabinet body, and the resistance-variable mechanism is electrically connected with a second motor.

As a preferable embodiment of the laboratory fume hood of the present invention, wherein: the resistance-changing mechanism comprises a resistance wire, a slip sheet, a first binding post and a second binding post, the resistance wire is fixed in the groove, the slip sheet is fixedly connected with one end of a second transverse rod, one side of the slip sheet is connected with the resistance wire in a sliding mode, the first binding post is arranged on the side, away from the resistance wire, of the slip sheet, one end of the resistance wire is fixedly connected with the second binding post, and the first binding post is electrically connected with the second binding post through a second motor.

As a preferable embodiment of the laboratory fume hood of the present invention, wherein: the lower cabinet body is provided with a plurality of storage cabinets, and the plurality of storage cabinets are provided with cabinet doors.

The invention has the beneficial effects that: according to the invention, the air supply assembly is arranged to block an opening between the cabinet door and the operating platform by using the air wall, so that harmful gas generated in an experiment is prevented from injuring an experimenter. Meanwhile, the variable resistance mechanism is utilized to ensure that the force of the air wall sprayed out by the nozzle is large when the door moving mechanism is lifted and descended, thereby achieving the purpose of saving energy.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:

FIG. 1 is a schematic view of the entire structure of embodiment 1;

FIG. 2 is a schematic structural view of a sliding door assembly on a cabinet body;

FIG. 3 is a schematic structural view of the air supply assembly on the cabinet body;

FIG. 4 is a schematic view of the nozzle engaging the third rail;

fig. 5 is a schematic structural view of the varistor mechanism.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

Example 1

The embodiment provides a laboratory fume hood, as shown in fig. 1, which includes a hood body 100, the hood body 100 includes an upper hood body 101 and a lower hood body 102, a cavity 101a is provided in the upper hood body 101; the lower surface of the interior of the upper cabinet body 101 is an operating platform, a water pool is arranged on the operating platform, a water tap is arranged on one side of the water pool, an experimenter can perform scientific experiments on the operating platform, a fixed transparent glass door 400 is arranged on one side of the cavity 101a, an opening is formed between the glass door 400 and the lower surface of the upper cabinet body 102, and the operator can stretch both hands into the cavity 101a from the opening to perform experimental operations so as to prevent waste gas generated by the experiments from leaking from the side edge of the upper cabinet body 101; the lower cabinet body 102 is provided with a plurality of storage cabinets 102a, the storage cabinets 102a can be used for storing experimental tools and experimental supplies, the plurality of storage cabinets 102a can be used for storing different types of experimental supplies, and the plurality of storage cabinets 102a are provided with cabinet doors 102 b.

This laboratory fume chamber includes air exhaust assembly 200, and air exhaust assembly 200 sets up in last cabinet body 101 and passes through cavity 101a and the cabinet body 100 outside, and air exhaust assembly 200 includes fan 201, and the top of the cabinet body 101 of telling is equipped with the fan hole, and fan 201 fixes in the fan hole. The fan 201 generates negative pressure after rotating, laboratory waste gas generated in experiments of experiment operators can be discharged from the cavity 101a, and one end of the fan 201 far away from the cavity 101a is provided with a waste gas removal processing device, generally an activated carbon bed, for absorbing waste gas generated in the laboratory.

Example 2

This example provides a laboratory fume hood, as shown in fig. 2-4, which differs from example 1 in that,

the upper cabinet body 101 is provided with a door moving mechanism 103, the door moving mechanism 103 comprises a first moving door 103a, a first cross rod 103a-1, a second moving door 103b, a second cross rod 103b-1 and a lifting mechanism 103c, the lower end of the first moving door 103a is provided with the first cross rod 103a-1, two ends of the first cross rod 103a-1 are fixedly connected with the side walls of two sides of the upper cabinet body 101, the upper end of the second moving door 103b is provided with the second cross rod 103b-1, the side walls of two sides of the upper cabinet body 101 are symmetrically provided with grooves, two ends of the second cross rod 103b-1 are in sliding contact with the upper cabinet body 101 in the grooves, and one side of the second cross rod 103b-1 is connected with the lifting mechanism 103 c. The first sliding door 103a and the second sliding door 103b are transparent glass doors, the first cross bar 103a-1 and the first sliding door 103a are fixed on the side wall of the cavity 101a, the second sliding door 103b can move in the groove along the axial direction of the groove under the action of the lifting mechanism 103c, when the second sliding door 103b moves from the bottom of the groove to the top of the groove under the action of the lifting mechanism 103c, the second sliding door 103b gradually moves upwards, an opening is formed between the second sliding door 103b and the operating platform, and an operator can stretch hands into the cavity 101a from the opening to perform experimental operation.

The lifting mechanism 103c comprises a first motor 103c-1 and a rotating rod 103c-2, the first motor 103c-1 is located in the lower cabinet body 102, one end of the rotating rod 103c-2 is fixedly connected with an output shaft of the first motor 103c-1, one end of the rotating rod 103c-2, which is far away from the first motor 103c-1, extends into the upper cabinet body 101 from the lower cabinet body 102 to be rotatably connected with the top end of the upper cabinet body 101, one end of the second cross rod 103b-1 is provided with a through hole, an internal thread is arranged in the through hole, an external thread is arranged on the outer surface of the rotating rod 103c-2, and the rotating rod 103c-2 penetrates through the through hole to be in threaded connection with the second cross rod 103 b-1. The first motor 103c-1 rotates to drive the rotating rod 103c-2 to rotate, the rotating rod 103c-2 is in threaded connection with the second cross rod 103b-1, meanwhile, one end of the second cross rod 103b-1 is in sliding contact with the groove, the groove has a limiting effect on the second cross rod 103b-1, and the second cross rod 103b-1 can move up and down along the axis of the rotating rod 103c-2 under the effect of the rotating rod 103 c-2.

Go up and be equipped with air supply assembly 300 in the cabinet body 101, air supply assembly 300 includes second motor 301, fan 302, interior runner 303 and nozzle 304, cabinet body 100 top is arranged in to second motor 301, second motor 301 output shaft fixed connection fan 302, the air intake of interior runner 303 is connected to the fan 302 mouth of blowing, interior runner 303 is located cabinet body 100 inner wall, interior runner 303 is kept away from fan 302 one end and is divided into a plurality of air outlets, a plurality of air outlets equidistance are arranged in the lower surface department of last cabinet body 101, all be equipped with nozzle 304 in the air outlet. The second motor 301 drives the fan 302 to rotate, a certain amount of wind is blown into the inner flow channel 303 through the wind blowing port by the fan 302, the inner flow channel 303 is arranged inside the side wall of the cabinet body, the inner flow channel 303 divides into a plurality of air outlets in the side wall, each air outlet is provided with a nozzle 304, the direction of the nozzle 304 is perpendicular to the direction of the second sliding door 103b, the plurality of air outlets are located at the projection position of the second sliding door 103b on the lower surface of the upper cabinet body 101, and the axis of the nozzle 304 coincides with the axis of the air outlet. The nozzles 304 are arranged at equal intervals, when the nozzles 304 spray out the wind introduced by the fan 302, a wind blocking wall can be formed at the lower ends of the nozzles 304 and the second sliding door 103b, and the wind blocking wall can prevent experimental waste gas generated in the experiment in the chamber from overflowing from an opening formed between the second sliding door 103b and the operating platform, so that the safety of experiment operators is ensured.

The lower end of the second sliding door 103b is provided with a third cross bar 103b-2, the third cross bar 103b-2 is parallel to the second cross bar 103b-1, and one side of the third cross bar 103b-2 far away from the second cross bar 103b-1 is provided with an inclined plane. The cross section of the inclined plane is an isosceles right triangle, and the hypotenuse of the triangle faces the cavity 101 a. The air flow sprayed upwards by the nozzle 304 is in contact with the inclined surface, the air flow can enter the cavity 101a under the guidance of the inclined surface, the air pressure at the upper end in the cavity 101a is smaller than that at the lower end, and then the waste gas generated by the experiment on the operation table is accelerated to rise to the exhaust assembly 200 under the action of the air pressure and is exhausted out of the ventilation hood by the exhaust assembly 200.

Example 3

The present embodiment provides a laboratory fume hood, as shown in fig. 2-5, which differs from the first embodiment in that,

the connecting part of the door moving mechanism 103 and the upper cabinet body 101 is provided with a resistance-changing mechanism 104, and the resistance-changing mechanism 104 is electrically connected with a second motor 301. The resistance-changing mechanism 104 comprises a resistance wire 104a, a sliding piece 104b, a first binding post 104c and a second binding post 104d, the resistance wire 104a is fixed in the groove, the sliding piece 104b is fixedly connected with one end of a second cross rod 103b-1, one side of the sliding piece 104b is in sliding connection with the resistance wire 104a, the first binding post 104c is arranged on one side, away from the resistance wire 104a, of the sliding piece 104b, one end of the resistance wire 104a is fixedly connected with the second binding post 104d, and the first binding post 104c and the second binding post 104d are electrically connected with the second motor 301. A resistance wire 104a is arranged in the groove, the resistance wire 104a, a slide piece 104b, a second binding post 104d, a first binding post 104c, a second motor 301, an external power supply and a switch form a closed loop, when the sliding sheet 104b slides upwards on the resistance wire 104a, the length of the resistance wire 104a connected into the closed loop is shortened, and further the resistance value of the resistance connected into the circuit is reduced, because the power of the electric appliance is inversely proportional to the resistance value of the circuit resistor, the power of the second motor 301 is increased, the rotating speed of the fan 302 is increased, the flow speed of the airflow sprayed from the touch nozzle is increased, the size of the airflow sprayed from the nozzle 304 can be ensured to be consistent all the time, that is, when the distance between the third cross bar 103b-2 and the operation table becomes larger, the air flow ejected from the nozzle 304 becomes larger accordingly, further ensuring that waste gas generated in the experiment cannot overflow from an opening formed between the second sliding door 103b and the cabinet body; when the sliding sheet 104b slides downwards on the resistance wire 104a, the length of the resistance wire 104a connected into the closed loop is increased, and then the resistance value of the connected circuit is increased, because the power of an electric appliance is inversely proportional to the resistance value of the circuit, the power of the second motor 301 is reduced, the rotating speed of the fan 302 is reduced, the flow speed of the airflow sprayed out of the touch nozzle is reduced, and further the size of the airflow sprayed out of the nozzle 304 can be ensured to be consistent all the time, namely, when the distance between the third cross rod 103b-2 and the operating platform is reduced, the airflow sprayed out of the nozzle 304 is correspondingly reduced, and further, the waste gas generated in the experiment can not overflow from an opening formed between the second sliding door 103b and the cabinet body, and the safety of experimenters is ensured.

It is important to note that the construction and arrangement of the present application as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperatures, pressures, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter recited in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of this invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the present invention is not limited to a particular embodiment, but extends to various modifications that nevertheless fall within the scope of the appended claims.

Moreover, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those unrelated to the presently contemplated best mode of carrying out the invention, or those unrelated to enabling the invention).

It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, without undue experimentation.

It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.

Claims

1. A laboratory fume chamber, its characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,

the cabinet comprises a cabinet body (100), wherein the cabinet body (100) comprises an upper cabinet body (101) and a lower cabinet body (102), and a cavity (101a) is arranged in the upper cabinet body (101); and

the air exhaust assembly (200), the air exhaust assembly (200) includes a fan (201), the fan (201) is located at the top end of the upper cabinet body (101), and the fan (201) is communicated with the cavity (101a) and the outside of the cabinet body (100).

2. A laboratory fume hood according to claim 1 wherein: go up and be equipped with on the cabinet body (101) and move a mechanism (103), move a mechanism (103) including first door (103a), first horizontal pole (103a-1), second door (103b), second horizontal pole (103b-1) and elevating system (103c) that move, first door (103a) lower extreme that moves is equipped with first horizontal pole (103a-1), first horizontal pole (103a-1) both ends fixed connection goes up cabinet body (101) both sides lateral wall, the second moves door (103b) upper end and is equipped with second horizontal pole (103b-1), it is equipped with the recess to go up the symmetry on the lateral wall of cabinet body (101) both sides, second horizontal pole (103b-1) both ends in the recess with last cabinet body (101) sliding contact, elevating system (103c) is connected to second horizontal pole (103b-1) one side.

3. A laboratory fume hood according to claim 2 wherein: elevating system (103c) include first motor (103c-1) and dwang (103c-2), first motor (103c-1) is located cabinet body (102) down, dwang (103c-2) one end fixed connection first motor (103c-1) output shaft, dwang (103c-2) are kept away from first motor (103c-1) one end and are stretched into in the upper cabinet body (101) from lower cabinet body (102) and are connected with the top rotation of upper cabinet body (101), second horizontal pole (103b-1) one end is equipped with the through-hole, be equipped with the internal thread in the through-hole, dwang (103c-2) surface is equipped with the external screw thread, dwang (103c-2) pass from the through-hole in with second horizontal pole (103b-1) threaded connection.

4. A laboratory fumehood according to any one of claims 1, 2, 3 wherein: an air supply assembly (300) is arranged in the upper cabinet body (101).

5. A laboratory fume hood according to claim 4 wherein: air supply subassembly (300) include second motor (301), fan (302), interior runner (303) and nozzle (304), the cabinet body (100) top is arranged in second motor (301), second motor (301) output shaft fixed connection fan (302), the air intake of interior runner (303) is connected to fan (302) mouth of blowing, interior runner (303) are located the cabinet body (100) inner wall, fan (302) one end is kept away from in interior runner (303) and is divided into a plurality of air outlets (302a), and is a plurality of air outlet (302a) equidistance is arranged in the lower surface department of the last cabinet body (101), all be equipped with nozzle (304) in air outlet (302 a).

6. A laboratory fume hood according to claim 5 wherein: the air outlets (302a) are located at the projection position of the second movable door (103b) on the lower surface of the upper cabinet body (101), and the axis of the nozzle (304) is coincident with the axis of the air outlet (302 a).

7. A laboratory fume hood according to claim 2 or 3 wherein: the lower end of the second sliding door (103b) is provided with a third cross bar (103b-2), the third cross bar (103b-2) is parallel to the second cross bar (103b-1), and one side, far away from the second cross bar (103b-1), of the third cross bar (103b-2) is provided with an inclined plane (103 b-21).

8. A laboratory fume hood according to claim 5 wherein: the door moving mechanism (103) is provided with a variable resistance mechanism (104) at the joint with the upper cabinet body (101), and the variable resistance mechanism (104) is electrically connected with a second motor (301).

9. A laboratory fume hood according to claim 8 wherein: the resistance-changing mechanism (104) comprises a resistance wire (104a), a sliding piece (104b), a first binding post (104c) and a second binding post (104d), the resistance wire (104a) is fixed in a groove, the sliding piece (104b) is fixedly connected with one end of a second cross rod (103b-1), one side of the sliding piece (104b) is connected with the resistance wire (104a) in a sliding mode, the first binding post (104c) is arranged on one side, away from the resistance wire (104a), of the sliding piece (104b), one end of the resistance wire (104a) is fixedly connected with the second binding post (104d), and the first binding post (104c) is electrically connected with the second binding post (104d) to form a second motor (301).

10. A laboratory fume hood according to claim 1 wherein: the lower cabinet body (102) is provided with a plurality of storage cabinets (102a), and the plurality of storage cabinets (102a) are provided with cabinet doors (102 b).