CN210906206U

CN210906206U - Environmental test chamber with top air suction type air duct structure

Info

Publication number: CN210906206U
Application number: CN201920838075.5U
Authority: CN
Inventors: 张光辉
Original assignee: Jiangsu Tomilo Environmental Testing Equipment Co Ltd
Current assignee: Jiangsu Tuomiluo High End Equipment Co ltd
Priority date: 2019-06-05
Filing date: 2019-06-05
Publication date: 2020-07-03
Anticipated expiration: 2029-06-05

Abstract

The utility model provides an environmental test case with formula wind channel structure induced drafts in top, include: a box body; the bottom inserting plate is supported on the bottom wall of the box body, and a bottom air duct is formed between the bottom inserting plate and the bottom wall; the back plate is arranged between the top wall of the box body and the bottom inserting plate, and a back air channel communicated with the bottom air channel is formed between the back plate and the back side wall of the box body; the bottom inserting plate, the back plate, the top wall and the front side wall of the box body define a testing space, the testing space is communicated with the bottom air channel through an air outlet gap and communicated with the back air channel through an air inlet hole; a fan, a heating mechanism and an evaporator are sequentially arranged in the back air duct from top to bottom, and the fan corresponds to the air inlet hole; when the fan works, airflow in the testing space is sucked into the back air channel through the air inlet hole, flows through the fan, the heating mechanism and the evaporator in sequence, then enters the bottom air channel, and then enters the testing space through the air outlet gap. The utility model discloses environmental test case can be the better satisfy the index requirement of air current homogeneity in the test space.

Description

Environmental test chamber with top air suction type air duct structure

Technical Field

The utility model relates to an environmental test equipment technical field especially relates to an environmental test case with formula wind channel structure is induced drafted at top.

Background

The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

In the prior art of the environmental test chamber represented by fig. 1, an air duct structure with top blowing and bottom suction is mostly adopted. The centrifugal fan is arranged at the top of the environment test box, air is blown to the test area from the top, and air flow enters the air channel from the bottom of the environment test box after circulating in the test area, so that the circulation is repeated.

However, the air duct structure with the top blowing part and the bottom air suction part has the following problems:

1. the wind direction is relatively disorderly, in order to meet the uniformity index. Therefore, the time is spent for adjusting the grating plates at the air outlet at the top, the time and the labor are wasted, and the labor cost and the time cost are high.

2. The motor that drive centrifugal fan worked is installed at the top of environmental test case, can make the high increase of environmental test case, occupies extra high space, brings the difficulty for transport and installation. Especially when the height of the door is limited, it is difficult to move the equipment into the room.

It should be noted that the above background description is only for the sake of clarity and complete description of the technical solutions of the present invention, and is set forth for facilitating understanding of those skilled in the art. These solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the present invention.

SUMMERY OF THE UTILITY MODEL

Based on aforementioned prior art defect, the embodiment of the utility model provides an environmental test case with formula wind channel structure is induced drafted at top, one of above-mentioned problem can be solved at least to it.

In order to achieve the above object, the present invention provides the following technical solutions.

An environmental test chamber with a top-suction air duct structure, comprising:

a box body;

the bottom inserting plate is arranged in the box body and supported on the bottom wall of the box body; the bottom inserting plate and the bottom wall of the box body are arranged at intervals, so that a bottom air duct is formed between the bottom inserting plate and the bottom wall of the box body; the front end part and the back end part of the bottom inserting plate are respectively arranged at intervals with the front side wall and the back side wall of the box body, and the left side end part and the right side end part of the bottom inserting plate are respectively arranged at intervals with the left side wall and the right side wall of the box body;

the upper end of the back plate is connected with the top wall of the box body, the lower end of the back plate is connected with the end part of the back surface of the bottom inserting plate, and the back plate and the side wall of the back surface of the box body are arranged at intervals, so that a back air channel is formed between the back plate and the side wall of the back surface of the box body and is communicated with the bottom air channel;

the bottom inserting plate, the back plate, the top wall and the front side wall of the box body define a testing space, the testing space is communicated with the bottom air channel through an air outlet gap formed between the bottom inserting plate and the front side wall of the box body, the testing space is communicated with the back air channel through an air inlet hole formed in the back plate, and the air inlet hole is formed in a position close to the upper end of the back plate;

the fan is arranged at the top of the back air channel and corresponds to the air inlet hole, the heating mechanism is arranged below the fan, and the evaporator is arranged below the heating mechanism;

when the fan works, the airflow in the test space is sucked into the back air duct through the air inlet hole, sequentially flows through the fan, the heating mechanism and the evaporator, then enters the bottom air duct, and then enters the test space through the air outlet gap.

Preferably, the bottom wall of the box body is provided with a water chute, and the water chute is connected with a drain pipe; the bottom inserting plate covers the water chute and the water discharging pipe.

Preferably, the bottom plug board is provided with a flat upper surface, and the flat upper surface of the bottom plug board is used for placing a sample to be tested; the sample to be tested is lifted above the bottom wall of the box body and is spaced from the water chute.

Preferably, the bottom inserting plate comprises a plate body, and a left side supporting rib plate and a right side supporting rib plate which are arranged on the lower surface of the plate body, and the left side supporting rib plate and the right side supporting rib plate extend along the front-back horizontal direction; all be provided with a plurality of exhaust vents on left side support floor and the right side support floor, it is a plurality of the exhaust vent intercommunication test space with the bottom wind channel.

Preferably, the left support rib is provided at a left end of the panel body, and the right support rib is provided at a right end of the panel body.

Preferably, the lower surface of the plate body is provided with a plurality of air duct adjusting plates positioned between the left side supporting rib plate and the right side supporting rib plate, and the plurality of air duct adjusting plates extend along the left-right horizontal direction; each air channel adjusting plate is provided with a plurality of adjusting openings, and each adjusting opening is correspondingly provided with a rotatable air channel adjusting plate; the air duct adjusting plate can be rotated in the corresponding adjusting opening by carrying out toggle operation so as to adjust the opening degree of the adjusting opening.

Preferably, the plurality of air duct adjusting plates are arranged in parallel with each other, and the plurality of air duct adjusting plates are arranged perpendicular to the left and right support ribs.

Preferably, the upper and lower inner walls of the adjusting opening are respectively provided with a rotary groove, a mounting hole penetrates through the air duct adjusting plate, a rotary shaft penetrates through the mounting hole, and two ends of the rotary shaft are movably embedded in the rotary grooves.

Preferably, a hygrothermograph is arranged in the bottom air duct, and the hygrothermograph is arranged at a position close to the front side wall of the box body or the air outlet gap.

Preferably, the blower is driven to operate by a motor provided on an outer surface of a rear side wall of the case.

The utility model discloses environmental test case is through setting up end picture peg and backplate in the box to form the bottom wind channel between the diapire of end picture peg and box, and form the back wind channel between backplate and the box, and the position that is close to the top in the back wind channel sets up the fan. Therefore, when the fan is operated, the air flow in the test space can be sucked into the back air duct in an air suction mode. Through forming the back wind channel and the bottom wind channel which are communicated with each other, the air flow can be forced to flow in the wind channel structure and is discharged at a preset position, namely the air outlet gap. Therefore, the phenomenon that the airflow is disturbed in the testing space can be reduced, and the uniformity of the airflow in the testing space is improved.

In addition, a motor for driving the fan to operate is arranged on the outer surface of the back side wall of the box body. Therefore, the motor does not increase the height size and the occupied height space of the environmental test chamber, and is convenient to carry.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, which specify the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the present invention are not so limited in scope.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for helping the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. The skilled person in the art can, under the teaching of the present invention, choose various possible shapes and proportional dimensions to implement the invention according to the specific situation. In the drawings:

FIG. 1 is a schematic diagram of a typical environmental test chamber of the prior art;

fig. 2 is a schematic perspective view of an environmental test chamber with a top air-suction type air duct structure according to an embodiment of the present invention;

fig. 3 is a schematic side cross-sectional view of an environmental test chamber with a top-suction air duct structure according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of the bottom inserting plate in the environmental test chamber shown in fig. 2 and 3.

Detailed Description

In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a single embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In this specification, will the environmental test chamber with top formula wind channel structure of induced drafting of the embodiment of the utility model under normal use state, the direction that deviates from ground is defined as "last", and on the contrary, the direction that points to ground is defined as "down". The direction facing the user is defined as "front and back", and the left and right hand directions of the user are designated as "left and right". In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

It is worth noting that the definition of each direction in this specification is only for the convenience of the technical solution of the present invention, and the present invention is not limited to the direction of the environmental test chamber with the top air-suction type air channel structure in other scenes that may cause the orientation of the environmental test chamber with the top air-suction type air channel structure to be reversed or the position to be changed, including but not limited to use, test, transportation, and manufacture.

As shown in fig. 2 and fig. 3, the environmental test chamber with a top suction type air duct structure provided by the embodiment of the present invention includes a box body 1. The case 1 may be generally rectangular cuboid in shape so that it has a top wall, a bottom wall, a front side wall, a back side wall, a left side wall and a right side wall. The top wall, the bottom wall, the front side wall, the back side wall, the left side wall and the right side wall enclose to form a box body 1 with a hollow structure, and a main body frame of the environmental test box is formed.

Wherein, a door 2 is arranged on the front side wall of the box body 1, and the door 2 can be opened or closed. So that the specimen 3 to be tested can be put into the case 1 or the specimen 3 to be tested can be taken out of the case 1.

The box body 1 is provided with a bottom inserting plate 4 and a back plate 5. Wherein, the bottom inserting plate 4 is supported on the bottom wall of the box body 1 and is arranged at intervals with the bottom wall of the box body 1. Thus, a bottom air duct 6 is formed between the bottom inserting plate 4 and the bottom wall of the box body 1.

As shown in fig. 4, the bottom insert plate 4 may be substantially rectangular, and its dimension in the front-rear direction (length dimension) is smaller than the dimension in the front-rear direction (length dimension) of the bottom wall of the case 1, and its dimension in the left-right direction (width dimension) is also smaller than the dimension in the left-right direction (width dimension) of the bottom wall of the case 1.

The bottom inserting plate 4 is arranged in parallel with the bottom wall of the box body 1. Therefore, based on the above-described dimensioning, the front and rear end portions of the bottom insert plate 4 are spaced from the front and rear side walls of the case 1, respectively, while the left and right end portions are also spaced from the left and right side walls of the case 1, respectively.

In other words, the outer end of the bottom insert plate 4 is spaced from the inner wall of the case 1. Preferably, the bottom inserting plate 4 and the bottom wall of the box body 1 are the same in shape, and the bottom inserting plate 4 and the bottom wall of the box body 1 are reduced in equal proportion. The bottom insert plate 4 is concentrically arranged with the cabinet 1 such that each end portion of the bottom insert plate 4 is parallel to and spaced from the corresponding inner side wall of the cabinet 1.

Thus, an air outlet gap 401 is formed between the front end of the bottom board 4 and the front side wall of the box body 1, and a communication gap 402 is formed between the back end of the bottom board 4 and the back side wall of the box body 1.

The dimension (height dimension) of the back plate 5 in the vertical direction is equal to the distance between the bottom insertion plate 4 and the top wall of the case 1, and the dimension (width dimension) in the left-right direction is equal to the dimension (width dimension) of the back side wall of the case 1 in the left-right direction, or equal to the distance between the left side wall and the right side wall of the case 1.

The back plate 5 is arranged in parallel with the back side wall of the box body 1 and is vertically arranged between the bottom inserting plate 4 and the top wall of the box body 1. Therefore, based on the above-mentioned dimension design, the upper end of the back plate 5 is connected with the top wall of the box body 1, and the lower end is connected with the back end of the bottom inserting plate 4. And left and right side ends of the back plate 5 are in contact with left and right side walls of the cabinet 1, respectively.

Wherein, modes such as welding, connecting bolt connection, bonding, joint can be adopted between the upper end and the lower extreme of backplate 5 and the roof and the diapire of box 1 to realize connecting. The left end and the right end of the back plate 5 are respectively contacted with the left side wall and the right side wall of the box body 1, so that the back plate can be simply contacted without any fixed acting force, and can also be contacted with the fixed acting force in the modes of welding, connecting bolt connection, bonding, clamping and the like.

In addition, the back plate 5 is spaced apart from the rear side wall of the case 1. Thus, a back air duct 7 is formed between the back plate 5 and the back side wall of the cabinet 1. The back air duct 7 communicates with the bottom air duct 6 through the communication gap 402. The back air duct 7 and the bottom air duct 6 form an air duct structure of the environmental test chamber.

Further, the bottom inserting plate 4, the back plate 5 and the top wall and the front side wall of the box body 1 define a testing space 8, and the testing space 8 is communicated with the air duct structure. Specifically, the test space 8 is communicated with the bottom air duct 6 through an air outlet gap 401, an air inlet hole 501 is formed in the position, close to the upper end, of the back plate 5, and the air inlet hole 501 of the test space 8 is communicated with the back air duct 7. As shown in fig. 2, the air inlet holes 501 may be plural to increase the amount of air to be supplied.

The back air duct 7 is provided with a fan 9, a heating mechanism 10 and an evaporator 11. The fan 9 is located at the top of the back air duct 7 and corresponds to the air inlet 501, the heating mechanism 10 is located below the fan 9, and the evaporator 11 is located below the heating mechanism 10. Namely, the fan 9, the heating mechanism 10 and the evaporator 11 are arranged in sequence from top to bottom.

When the fan 9 works, the airflow in the testing space 8 is sucked into the back air duct 7 through the air inlet 501, flows through the fan 9, the heating mechanism 10 and the evaporator 11 in sequence, enters the bottom air duct 6, and then enters the testing space 8 through the air outlet gap 401. I.e. the direction of the air flow in the air duct and the test space 8 is shown in figure 3 as arrows.

The fan 9, the heating mechanism 10 and the evaporator 11 may be any suitable existing structure, and the embodiment of the present invention is not limited thereto. Wherein the blower 9 is driven to operate by a motor 12, and the motor 12 is provided on the outer surface of the rear side wall of the cabinet 1. Therefore, the motor 12 does not increase the height size and the occupied height space of the environmental test chamber, and is convenient to carry. The heating mechanism 10 may be a tubular electric heater for heating the air flow. The evaporator 11 may be a thin film evaporator 11, a wiped film evaporator 11, a plate evaporator 11, or the like, which is not limited by the embodiment of the present invention.

In general, the environmental test chamber generates condensed water when high and low temperature tests are performed. In order to discharge the condensed water, a water chute (not shown) is disposed on the bottom wall of the box body 1, four folded edges are pressed out, and a drain pipe is welded to the lower side of the lowest position, so that the condensed water is discharged.

In conventional environmental test chambers, the sample 3 to be tested is generally placed directly on the bottom wall. In order to smoothly discharge water, the bottom wall of the environmental test chamber is generally designed to be high in the middle and low in the side. Therefore, the bottom wall of the environmental test chamber is not flat, and the sample 3 to be tested may be placed unevenly. Moreover, people can directly see the edge pressing and the drain pipe, and the appearance is poor.

And the utility model discloses in, because the bottom inserting plate 4 of injecing bottom wind channel 6 can cover the guiding gutter to can cover blank pressing and drain pipe, thus not influence the outward appearance of product, user experience is better.

In order to enable the sample 3 to be tested to be placed flatly, the bottom plate 4 has a flat upper surface, and the sample 3 to be tested can be placed on the flat upper surface of the bottom plate 4. In addition, the bottom inserting plate 4 can be used for placing the sample 3 to be tested higher than the bottom wall of the box body 1, so that the sample 3 to be tested is spaced from the water chute, and the sample 3 to be tested is prevented from being infected by water.

A hygrothermograph 13 is arranged in the bottom air duct 6, and the hygrothermograph 13 is arranged at a position close to the front side wall of the box body 1 or the air outlet gap 401. In the present embodiment, the thermo-hygrometer 13 can be a wet and dry bulb thermometer. The dry-wet bulb thermometer works on the principle that the dry-wet bulb thermometer consists of two thermometers with the same specification, one thermometer is called a dry bulb thermometer, and a bulb of the thermometer is exposed to the air to measure the ambient temperature. The other one is called wet bulb thermometer, the warm bulb is wrapped by special gauze, and the gauze is kept wet, the moisture in the gauze is continuously evaporated to the surrounding air and takes away the heat, so that the temperature of the wet bulb is reduced.

The rate of moisture evaporation is related to the ambient air moisture content, with lower air humidity, faster moisture evaporation rate, resulting in lower wet bulb temperature. It can be seen that there is a functional relationship between air humidity and wet-dry bulb temperature difference. The wet and dry bulb hygrometers utilize this phenomenon to determine air humidity by measuring the dry bulb temperature and the wet bulb temperature.

The air duct structure of the existing environmental test chamber is designed by blowing air at the top and sucking air at the bottom, and the hygrothermograph 13 and the cotton yarn belt are installed at the air outlet 404a at the top. To change the cotton yarn belt, the operator must climb into the environmental test chamber, and the operation is inconvenient.

And the embodiment of the utility model provides a set up hygrothermograph 13 in bottom wind channel 6 and be close to the positive lateral wall of box 1 or the position department in air-out clearance 401, lie in 2 side end picture peg 4 of door promptly, operating personnel squats a little and can change, and it is very convenient to operate.

As shown in fig. 2 and 4, the bottom inserting plate 4 includes a flat plate body 403, and a left support rib 404 and a right support rib 405 provided on a lower surface of the plate body 403 to extend in the front-rear horizontal direction, and the left support rib 404 is provided on a left end portion of the plate body 403 and the right support rib 405 is provided on a right end portion of the plate body 403. The left and

right support ribs

404 and 405 may be integrally formed with the plate body 403, and specifically, the edges of the left and

right support ribs

404 and 405 not formed on the plate body 403 may be formed by bending or sheet metal process.

The left support rib 404 and the right support rib 405 are respectively provided with a plurality of

air outlets

404a and 405a, and the plurality of

air outlets

404a and 405a communicate the test space 8 with the bottom air duct 6. The air flow in the bottom duct 6 can further enter the test space 8 through the

air outlet holes

404a and 405 a.

In order to adjust the air volume, a structure for adjusting the opening degree of the air duct is provided on the lower surface of the plate 403.

Specifically, a plurality of air duct adjusting plates 406 which are located between the left support rib 404 and the right support rib 405 and extend in the horizontal direction are provided on the lower surface of the plate body 403, the plurality of air duct adjusting plates 406 are arranged in parallel with each other, and the plurality of air duct adjusting plates 406 are arranged perpendicular to the left support rib 404 and the right support rib 405. That is, both ends of the plurality of air duct adjusting plates 406 are fixedly connected to the left support rib 404 and the right support rib 405, respectively.

Furthermore, each air duct adjusting plate 406 is provided with a plurality of adjusting openings 406a, and each adjusting opening 406a is correspondingly provided with a rotatable adjusting valve plate 407. The regulating valve plate 407 is adapted to the shape of the regulating opening 406 a. The specific rotating arrangement may be that the upper and lower inner walls of the adjusting opening 406a are respectively provided with a rotating groove (not shown), the adjusting valve plate 407 is provided with a mounting hole (not shown) in a penetrating manner, a rotating shaft (not shown) is provided in the mounting hole in a penetrating manner, and two ends of the rotating shaft are movably embedded in the rotating grooves. Thus, the regulating valve plate 407 rotates about the rotating shaft as a pivot shaft.

The regulating valve plate 407 can be rotated in the corresponding regulating opening 406a by performing a toggle operation to regulate the opening degree of the regulating opening 406 a. Thereby realizing the adjustment of the fluid area of the bottom air duct 6.

In practical application, a user can toggle one or more of the adjusting valve plates 407, and the opening of the adjusting opening 406a is adjusted by blocking the flow area of the adjusting opening 406a by the adjusting valve plates 407.

The utility model discloses environmental test case is through setting up end picture peg 4 and backplate 5 in box 1 to form bottom wind channel 6 between the diapire of end picture peg 4 and box 1, and form back wind channel 7 between backplate 5 and the box 1, and the position that is close to the top in back wind channel 7 sets up fan 9. Thus, the fan 9 can draw the air flow in the test space 8 into the back air duct 7 by means of suction when in operation. By forming the back air duct 7 and the bottom air duct 6 which are communicated with each other, the air flow can be forced to flow in the air duct structure and is discharged at a predetermined position, namely the air outlet gap 401. Thus, the occurrence of turbulence in the test space 8 can be reduced, and the uniformity of the airflow in the test space 8 can be improved.

Practice proves, the utility model discloses environmental test case can obtain following profitable technological effect:

1. the uniformity is good, and adjustment is not needed.

2. The maintenance and the replacement of the hygrometer cotton yarn belt are convenient.

3. The sample 3 to be tested is placed on the bottom inserting plate 4, and the water guide groove is covered by the bottom inserting plate 4, so that the customer experience is good.

Any numerical value recited herein includes all values from the lower value to the upper value that are incremented by one unit, provided that there is a separation of at least two units between any lower value and any higher value. For example, if it is stated that the number of a component or a value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 21 to 80, and more preferably from 30 to 70, it is intended that equivalents such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also expressly enumerated in this specification. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples of what is intended to be explicitly recited, and all possible combinations of numerical values between the lowest value and the highest value that are explicitly recited in the specification in a similar manner are to be considered.

Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. The use of "about" or "approximately" with a range applies to both endpoints of the range. Thus, "about 20 to about 30" is intended to cover "about 20 to about 30", including at least the endpoints specified.

The above description is only for the embodiments of the present invention, and those skilled in the art can make various changes or modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention according to the disclosure of the application document.

Claims

1. The utility model provides an environmental test case with top formula wind channel structure of induced drafting which characterized in that includes:

a box body;

the upper end of the back plate is connected with the top wall of the box body, and the lower end of the back plate is connected with the back end part of the bottom inserting plate; the back plate and the side wall of the back of the box body are arranged at intervals, so that a back air channel is formed between the back plate and the side wall of the back of the box body, and the back air channel is communicated with the bottom air channel;

2. The environmental test chamber with the top suction type air channel structure according to claim 1, wherein a water chute is arranged on the bottom wall of the chamber body, and a drain pipe is connected to the water chute; the bottom inserting plate covers the water chute and the water discharging pipe.

3. The environmental test chamber with the top suction duct structure according to claim 2, wherein the bottom inserting plate has a flat upper surface for placing a sample to be tested; the sample to be tested is lifted above the bottom wall of the box body and is spaced from the water chute.

4. The environmental test chamber with the top air suction type air duct structure according to claim 1, wherein the bottom inserting plate comprises a plate body, and a left supporting rib plate and a right supporting rib plate which are arranged on the lower surface of the plate body, and the left supporting rib plate and the right supporting rib plate extend in the front-back horizontal direction; all be provided with a plurality of exhaust vents on left side support floor and the right side support floor, it is a plurality of the exhaust vent intercommunication test space with the bottom wind channel.

5. The environmental test chamber with a top-draft air duct structure according to claim 4, wherein the left support rib is disposed at a left end of the plate body, and the right support rib is disposed at a right end of the plate body.

6. The environmental test chamber with the top suction air duct structure according to claim 4, wherein a plurality of air duct adjusting plates are disposed on the lower surface of the plate body and between the left and right supporting ribs, and the plurality of air duct adjusting plates extend in the left-right horizontal direction; each air channel adjusting plate is provided with a plurality of adjusting openings, and each adjusting opening is correspondingly provided with a rotatable air channel adjusting plate; the air duct adjusting plate can be rotated in the corresponding adjusting opening by carrying out toggle operation so as to adjust the opening degree of the adjusting opening.

7. The environmental test chamber with a top-suction air duct structure according to claim 6, wherein a plurality of air duct adjusting plates are disposed in parallel with each other, and a plurality of air duct adjusting plates are disposed perpendicular to the left and right support ribs.

8. The environmental test chamber with the top suction type air channel structure according to claim 7, wherein the upper and lower inner walls of the adjusting opening are respectively provided with a rotating slot, the air channel adjusting plate is provided with a mounting hole through, a rotating shaft is inserted into the mounting hole, and two ends of the rotating shaft are movably embedded in the rotating slots.

9. The environmental test chamber with the top air-suction duct structure according to claim 1, wherein a thermo-hygrometer is disposed in the bottom air duct, and the thermo-hygrometer is disposed at a position close to the front side wall of the chamber body or the air outlet gap.

10. The environmental test chamber with a top-suction air duct structure according to claim 1, wherein the fan is driven by a motor provided on an outer surface of a rear sidewall of the chamber body.