CN211120332U

CN211120332U - Drying cabinet

Info

Publication number: CN211120332U
Application number: CN201921639298.5U
Authority: CN
Inventors: 喻季红; 龚伟业
Original assignee: Hunan Sundy Science and Technology Co Ltd
Current assignee: Hunan Sundy Science and Technology Co Ltd
Priority date: 2019-09-27
Filing date: 2019-09-27
Publication date: 2020-07-28
Anticipated expiration: 2029-09-27

Abstract

The utility model discloses a drying box, which comprises a box body and a cavity formed by enclosing the box body, wherein a baffle plate is arranged in the cavity and used for dividing the cavity into a first cavity and a second cavity which are arranged up and down; a sample introduction door is arranged at one end of the first cavity, a heating cavity is arranged at one end of the box body opposite to the sample introduction door, the heating cavity is respectively communicated with the first cavity and the second cavity, a blast heating assembly is arranged in the heating cavity, an air return hole for communicating the first cavity with the second cavity is formed in one side, close to the sample introduction door, of the partition plate, and the first cavity, the heating cavity, the second cavity and the air return hole are sequentially communicated to form a circulating air duct; an air inlet assembly is arranged in the first chamber or the second chamber. The utility model discloses a drying cabinet has advantages such as simple structure is compact, cycle is short, drying effect is good.

Description

Drying cabinet

Technical Field

The utility model relates to a drying cabinet is refered in particular to in the dry technical field of sample.

Background

The coal sample mainly comprises organic matters and inorganic matters, and the inorganic matter moisture of the coal is the most easily changed component in each link. For a coal yard of a power plant, the moisture content in coal is the most basic index for evaluating the economic and use values of coal, the moisture content in coal directly influences the content of other components in coal or the content of calorific value, and simultaneously, the measurement, acceptance and management of coal are also influenced in a relevant way. Therefore, the determination of the moisture content in the coal is a critical link, and a drying oven for performing the moisture determination of the coal sample is an important component.

Traditional laboratory drying device adopts electric heat constant temperature air-blast drying cabinet mainly, and electric heat constant temperature air-blast drying cabinet needs artifical manual title appearance and record data at every turn, and degree of automation is low, needs someone on duty, and efficiency is not high. Meanwhile, the traditional drying box is large in size, and the consumption of nitrogen is large under the condition that the sample is dried by introducing nitrogen. Meanwhile, the traditional drying box has the defects that the temperature field difference in the cavity cannot meet the national standard requirement due to uneven circulating airflow, and meanwhile, the heat flow circulating speed of the traditional drying box is low, so that the gas exchange speed is low, water vapor in the cavity is difficult to remove, and the drying efficiency is low.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in: to the technical problem that prior art exists, the utility model provides a simple structure is compact, cycle is short, drying cabinet that drying effect is good.

In order to solve the technical problem, the utility model provides a technical scheme does:

a drying box comprises a box body and a cavity formed by enclosing the box body, wherein a partition plate is arranged in the cavity and used for dividing the cavity into a first cavity and a second cavity which are arranged up and down; a sample introduction door is arranged at one end of the first cavity, a heating cavity is arranged at one end of the box body opposite to the sample introduction door, the heating cavity is respectively communicated with the first cavity and the second cavity, a blast heating assembly is arranged in the heating cavity, an air return hole for communicating the first cavity with the second cavity is formed in one side, close to the sample introduction door, of the partition plate, and the first cavity, the heating cavity, the second cavity and the air return hole are sequentially communicated to form a circulating air duct; an air inlet assembly is arranged in the first chamber or the second chamber.

As a further improvement of the above technical solution:

the blowing and heating assembly comprises a blowing assembly and a heating assembly, the blowing assembly comprises a cross flow fan, and the arrangement direction of the cross flow fan is consistent with the width direction of the first chamber or the second chamber and is used for blowing uniform parallel wind into the first chamber or the second chamber.

The width of the air outlet of the crossflow fan is the same as that of the first chamber or the second chamber.

The heating assembly is positioned at the communication position of the heating cavity and the first chamber or the second chamber and is used for heating gas.

The heating assembly is a PTC heating sheet and is matched with the shape of the communication part.

The air blowing assembly and the heating assembly are both positioned on a mounting plate.

When the heating assembly is positioned at the communication position of the heating cavity and the first chamber, a mixed flow plate is arranged right in front of the heating assembly.

A temperature detection piece is arranged in the first cavity or the second cavity and is used for detecting the temperature of the gas in the corresponding cavity; the heating assembly is connected with the temperature detection piece and used for receiving the detected gas temperature value and heating and adjusting the gas temperature value so as to maintain the gas temperature in the corresponding cavity within a constant range.

The temperature detection piece comprises a fixed seat and a temperature measurement probe, the fixed seat is detachably connected to the box body, and the temperature measurement probe is installed in the fixed seat.

The air inlet assembly comprises an elongated air distributor which is arranged along the direction perpendicular to the arrangement direction of the circulating air duct.

The sampling door comprises a door plate, wherein the upper end of the door plate is arranged on the box body through a hinge piece, so that the door plate is turned over and opened in the box body under the pushing of external force or falls back and is closed under the action of gravity.

The box body is provided with an exhaust hole communicated with the outside.

And a butterfly bolt is arranged on one side of the exhaust hole and used for opening and closing the exhaust hole and adjusting the opening degree.

Compared with the prior art, the utility model has the advantages of:

the drying box of the utility model circularly heats the gas by the blast heating component, and the heating effect is good; the circulating air duct formed by sequentially communicating the second cavity, the heating cavity, the first cavity and the air return hole is adopted, the structure is simple, compact and ingenious, the gas circulation period is short, and the drying effect is good. Adopt crossflow blower to blast air among the blast air heating component, be the parallel wind in the circulation wind channel, guarantee the temperature in the first cavity better and satisfy the requirement, realization mode is simple reliable.

The drying box of the utility model can accelerate the gas flow rate in the circulating air duct, accelerate the air exchange of the gas and improve the drying efficiency compared with the common fan because the shape of the cross flow fan is matched with the shape of the heating cavity, namely matched with the cross section shapes of the first cavity and the second cavity; the arrangement direction of the cross flow fan is consistent with the width direction of the first cavity or the second cavity, and the cross flow fan is used for blowing uniform parallel wind into the first cavity or the second cavity; the width of the air outlet of the cross flow fan is the same as that of the first cavity or the second cavity, and the air can be blown to the full section of the first cavity or the second cavity, so that dead angles inside the cavity are eliminated, and the problem of air residue in the cavity during nitrogen ventilation and drying is avoided.

The drying box of the utility model is provided with the exhaust holes communicated with the outside, which is convenient for exhausting air and meets the requirements of nitrogen-introducing drying operation and the like on nitrogen concentration; in addition, the exhaust holes are convenient for water vapor to be exhausted, the drying efficiency is improved, and finally the nitrogen consumption and the drying efficiency are ensured within a reasonable interval.

The utility model discloses a drying cabinet is provided with the temperature detection spare in the box for detect the gas temperature in the second chamber and heat the regulation in order to carry out heating element, in order to maintain the gas temperature in the first chamber at the constant range.

Drawings

Fig. 1 is a perspective view of a first embodiment of the present invention.

Fig. 2 is a second perspective view of the first embodiment of the present invention.

Fig. 3 is a perspective view of the first embodiment of the box body according to the present invention.

Fig. 4 is a second perspective view of the first embodiment of the present invention.

Fig. 5 is a perspective structural view of the first embodiment of the heating chamber of the present invention.

Fig. 6 is a cross-sectional view of a first embodiment of the present invention.

Fig. 7 is a perspective view of the temperature detecting member according to the first embodiment of the present invention.

Fig. 8 is a perspective view of the air intake assembly according to the first embodiment of the present invention.

Fig. 9 is a perspective view of a second embodiment of the present invention.

Fig. 10 is a perspective view of the second embodiment of the present invention.

Fig. 11 is a second perspective view of the second embodiment of the case according to the present invention.

Fig. 12 is a sectional view of a second embodiment of the present invention.

The reference numbers in the figures denote: 1. a box body; 101. a partition plate; 1011. air return holes; 102. a ventilation plate; 1021. a first communication hole; 1022. a second communication hole; 103. a left side plate; 104. an upper flange plate; 105. a right side plate; 106. a fixing plate; 107. a base plate; 108. a front panel; 109. a heat insulation layer; 110. an exhaust hole; 111. a butterfly bolt; 112. a first chamber; 113. a second chamber; 114. a top cover plate; 2. a heating cavity; 201. mounting a plate; 202. closing the plate; 203. an air inlet; 204. an air outlet; 3. a blower heating assembly; 301. a blower assembly; 3011. a cross flow fan; 302. a heating assembly; 3021. a heating plate; 3022. a temperature relay; 303. a flow mixing plate; 4. a temperature detection member; 401. a temperature measuring probe; 402. a fixed seat; 5. an air intake assembly; 501. a gas distributor; 6. a sample introduction door; 601. a door panel; 602. an articulation member; 6021. a rotating shaft; 6022. a rotating shaft sleeve; 603. a balancing weight; 7. a baffle.

Detailed Description

The invention is further described with reference to the drawings and the specific embodiments.

The first embodiment is as follows:

as shown in fig. 1 to 8, the drying oven of the present embodiment is used for drying operation in moisture determination of a sample (such as a coal sample), and includes an oven body 1 and a chamber enclosed by the oven body 1, wherein a partition board 101 is arranged in the chamber and is used for dividing the chamber into a first chamber 112 and a second chamber 113 which are arranged up and down; the first chamber 112 is used for drying a sample (namely, a drying chamber, a sample tray for placing a sample with a corresponding particle size), one end of the first chamber 112 is provided with a sample introduction door 6, one end of the box body 1 opposite to the sample introduction door 6 is provided with a heating cavity 2, the heating cavity 2 is respectively communicated with the first chamber 112 and the second chamber 113, specifically, the first chamber 112 is provided with a first communicating hole 1021, the second chamber 113 is provided with a second communicating hole 1022, the heating cavity 2 is provided with an air inlet 203 and an air outlet 204, the second communicating hole 1022 is communicated with the air inlet 203, and the first communicating hole 1021 is communicated with the air outlet 204; be provided with air blast heating subassembly 3023 in the heating chamber 2, baffle 101 sets up the return air hole 1011 that is used for communicateing first cavity 112 and second cavity 113 near one side of advancing a kind door 6, is provided with air intake assembly 5 in the second cavity 113, and second cavity 113, heating chamber 2, first cavity 112 and return air hole 1011 communicate in proper order and form the circulating air duct.

The drying box of the utility model circularly heats the gas by the blast heating component 3023, and the heating effect is good; the second cavity 113, the heating cavity 2, the first cavity 112 and the air return hole 1011 are communicated in sequence to form a circulating air duct, so that the structure is simple, compact and ingenious, the gas circulation period is short, and the drying effect is good.

As shown in fig. 5, the heating cavity 2 is enclosed by a fan sealing plate 202 and a fan mounting plate 201; the blowing heating assembly 3023 provides power for the circulation of gas in the circulating air duct and heats the gas, and the blowing heating assembly 3023 specifically comprises a blowing assembly 301, a heating assembly 302 and a temperature relay 3022. The blower assembly 301 comprises a high-temperature resistant cross flow fan 3011 and provides power for internal circulation of gas in the circulating air duct, and the rotating speed of the cross flow fan 3011 can be adjusted by a stepless speed regulator connected with a motor of the cross flow fan 3011, so that the circulating speed and the air volume of the gas in the circulating air duct can be controlled in the most reasonable range, the drying efficiency can be guaranteed, and a sample can be prevented from being taken away by air flow. Through crossflow fan 3011 and the following settings, the following technical effects are achieved:

1. because the shape of the cross flow fan 3011 is matched with the shape of the heating cavity 2, namely matched with the cross section shapes of the first cavity 112 and the second cavity 113, compared with a common fan, the cross flow fan can accelerate the gas flow rate in the circulating air duct, accelerate the air exchange of the gas and improve the drying efficiency;

2. the arrangement direction of the cross flow fan 3011 is consistent with the width direction of the first cavity 112 or the second cavity 113, and is used for blowing uniform parallel wind into the first cavity 112 or the second cavity 113, and because the wind blown out by the cross flow fan 3011 is a wind current parallel to the first cavity 112 or the second cavity 113, the stability of a thermal field in the first cavity 112 can be better ensured, and the national standard requirements are met;

3. the width of the air outlet of the cross flow fan 3011 is the same as that of the first chamber 112 or the second chamber 113, and the air can be blown to the full section of the first chamber 112 or the second chamber 113, so that dead angles in the chambers are eliminated, and the problem of air residue in the chambers during nitrogen introduction and drying is avoided.

The heating component 302 is a PCT heating sheet 3021(PTC is a short for Positive Temperature Coefficient), and is fixed to the air outlet 204 of the cross flow fan 3011, and the shape of the heating sheet 3021 matches with the shape of the first through hole 1021 (i.e., the air outlet 204 of the heating cavity 2), so as to facilitate heating the full cross-section of the air at the air outlet 204 of the heating cavity 2 and sending the parallel air flow to the first chamber 112 (drying chamber), thereby rapidly raising the Temperature in the drying chamber, saving the time required for heating the drying chamber to the drying Temperature, improving the drying efficiency, and simultaneously, the parallel air flow better ensures that the Temperature in the drying chamber is within a reasonable range, and the structure is simpler and more reliable. The mixed flow plate 303 is installed right in front of the heating sheet 3021, and is used for uniformly mixing the parallel air at the air outlet 204 of the crossflow fan 3011, so as to further ensure that the temperature in the first chamber 112 is within a reasonable range, and simultaneously prevent the crossflow fan 3011 from directly blowing away the sample in the sample tray. Crossflow blower 3011 and heating element 302 are both mounted on mounting plate 201 to form an integral module, which can be separated from box 1 for easy assembly, disassembly and maintenance. In addition, in other embodiments, other forms of heat patch 3021 are also used, as the case may be.

As shown in fig. 4, 6 and 7, in the present embodiment, a temperature detection member 4 is provided in the second chamber 113 for detecting the temperature of the gas in the second chamber 113; the heating assembly 302 is connected to the temperature detecting member 4 for receiving the detected gas temperature value and performing heating adjustment to maintain the gas temperature in the second chamber 113 within a constant range (e.g., 105 ℃ -110 ℃). The temperature detecting member 4 is located at a position closer to the middle of the second chamber 113, so as to reduce the influence of turbulence and radiation of the heating plate 3021, and thus the temperature measurement of the working area in the drying chamber is more accurate. Specifically, a temperature relay 3022 is arranged on the heating assembly 302, a normally closed contact of the temperature relay 3022 is connected in series in a power supply loop of the heating assembly 302, when the temperature detection piece 4 detects that the temperature is greater than a preset value, the temperature relay 3022 is controlled to operate (or the temperature detection piece 4 sends a temperature signal to the control unit, and the control unit sends a corresponding control instruction after judging the temperature), and the normally closed contact is opened, that is, heating is turned off; of course, the heating power of the heating assembly 302 may also be adjusted. In addition, in other embodiments, the rotation speed of the cross flow fan 3011 may be adjusted according to the temperature value, so as to accelerate the circulation and further improve the drying efficiency. Specifically, as shown in fig. 7, the temperature detection part 4 includes a fixing base 402 and a temperature probe 401, the temperature probe 401 is installed in the fixing base 402, the fixing base 402 is detachably connected (e.g., screwed) to the side wall of the box body 1, and the temperature detection part is convenient to assemble and disassemble and convenient to maintain.

As shown in fig. 4, 6 and 8, in the present embodiment, the air inlet assembly 5 is used for conducting nitrogen supplying operation in the second chamber 113, and specifically includes a long air distributor 501, the air distributor 501 is disposed along a direction perpendicular to the arrangement direction of the circulating air duct, the air distributor 501 is a long air duct, the long air duct is provided with a plurality of air outlets, and since air is introduced at the end of the long air duct, in order to ensure that parallel nitrogen flows are formed and the nitrogen pressure and flow at each air outlet are consistent, the distance between the air outlets is gradually shortened along the direction from the air inlet end to the other end, and the sizes of the air outlets (different shapes such as circular or strip) are also gradually increased; meanwhile, the gas distributor 501 is arranged in the second chamber 113 in a negative pressure state and at a position close to the air inlet 203 of the heating chamber 2, so that the introduced gas can be rapidly heated by the heating sheet 3021 and then blown into the first chamber 112 through the cross flow fan 3011, the flow of nitrogen is accelerated, and the nitrogen concentration in the first chamber 112 can be more rapidly made to reach the required standard concentration; in addition, the low-pressure area formed by the air inlet 203 can better ensure that the gas can be smoothly introduced into the cavity, and the high-pressure area formed by the first chamber 112 can better ensure the sealing effect of the sample inlet door 6.

As shown in fig. 3, in the present embodiment, the sample inlet door 6 includes a door plate 601, and an upper end of the door plate 601 is mounted on the box body 1 through a hinge 602, so that the door plate 601 can be pushed by an external force to turn open towards the inside of the box body 1 or fall back and close under the action of gravity. The door plate 601 is preferably made of stainless steel, and the lower edge of the door plate 601 is curled (for example, in an arc transition shape), so that the door plate 601 can be in smooth transition on the crucible tray; the inner side of the door plate 601 is provided with the heat insulation layer, so that heat dissipation of the first chamber 112 to the outside is reduced, meanwhile, the addition of the counter weight of the door plate 601 is equivalent to better guarantee the sealing effect of the sample injection door 6, and certainly, the addition of the counter weight 603 on the door plate 601 can also guarantee the sealing effect; the hinge 602 (for example, in the form of combining the rotating shaft 6021 and the rotating shaft sleeve 6021) connects the door panel 601 and the box body 1, and the hinge 602 needs to ensure flexible movement and the door panel 601 can rotate smoothly under the action of gravity. Of course, a return spring may be provided at the rotating shaft 6021, so that a certain self-closing force is formed between the door plate 601 and the sealing material when the door plate falls back and is closed, thereby further ensuring the sealing effect. Certainly, in a specific application, the gas blown out from the first connection hole 1021 by the crossflow fan 3011 enters the first chamber 112, a positive pressure is formed in the first chamber 112, and a certain pressure can be provided for the door panel 601, so as to perform a certain sealing function, and prevent the external gas from entering the first chamber 112 from the sample inlet door 6 when the box body 1 operates.

In this embodiment, the box body 1 includes a ventilation plate 102, a left side plate 103, an upper flange plate 104, a right side plate 105, a flow mixing plate 303, a fixing plate 106, a bottom plate 107, a front panel 108, etc., the ventilation plate 102 is fixedly connected to the heating chamber 2, a first communicating hole 1021 and a second communicating hole 1022 are disposed on the ventilation plate 102, the left side plate 103, the upper flange plate 104, the right side plate 105, the bottom plate 107 and the front panel 108 form a box body 1 in a square shape or other shapes, and the upper flange plate 104 is used for fixing the top cover plate 119. The outer layer of the box body 1 is laid with a heat insulation layer 109 for heat insulation and heat preservation, and the influence of temperature channeling among the box bodies 1 which are arranged side by side is reduced. The shape of the box body 1 can be compatible with the drying operation of the total moisture measurement of 6mm and 13mm coal samples, and the box body is flexibly configured according to the requirements of customers. In addition, the whole box body 1 is flat, so that the circulation of gas in a circulating air channel is facilitated, the shape and the inner space of the box body 1 can be ensured to be minimum, the consumption of nitrogen is reduced under the condition of ensuring the drying efficiency, and the cost of consumables required by drying operation is saved.

As shown in fig. 1, in this embodiment, the first chamber 112 is provided with an exhaust hole 110 communicating with the outside, so as to exhaust air, and meet the requirement of nitrogen concentration for nitrogen-introducing drying operation, and specifically, when performing air evacuation operation, the box 1 is evacuated first and then filled with nitrogen, and of course, the evacuation and filling of nitrogen may be performed once or multiple times. In addition, the exhaust holes 110 are convenient for the discharge of water vapor, and the drying efficiency is improved. Specifically, the opening and closing and the opening degree of the exhaust hole 110 can be adjusted through a movable blocking piece or a butterfly bolt 111 on one side of the exhaust hole 110, the movable blocking piece or the butterfly bolt 111 is rotatably installed on one side of the exhaust hole 110, the opening degree adjustment is realized by manually rotating the position of the butterfly bolt 111, and finally the nitrogen consumption and the drying efficiency are ensured within a reasonable interval.

Example two:

as shown in fig. 9 to 12, the present embodiment is different from the first embodiment in that: the circulation direction of the gas in the circulation duct is opposite to that of the first embodiment, and the installation positions of the heating assembly 302, the air inlet assembly 5 and the temperature detection member 4 are different. Specifically, as shown in fig. 12, the gas circulation direction in the circulation duct is clockwise. The heating element 302 is installed at the second communicating hole 1022 (also at the air outlet 204 of the heating chamber 2), and compared with the first embodiment in which the heating element 302 is installed at the first communicating hole 1021, the depth of the first chamber 112 can be reduced, the volume of the box body 1 can be further reduced, and the gas mixing effect is better, while the gas distributor 501 is installed in the first chamber 112 near the first communicating hole 1021, and the temperature detecting element 4 is located in the second chamber 113 near the return air hole 1011. In addition, the guide plate 7 is arranged at the position of the air return hole 1011 of the second chamber 113, and the guide plate 7 can ensure that the air in the second chamber 113 smoothly enters the first chamber 112 through the air return hole 1011, thereby reducing energy loss and simultaneously reducing the noise of the box body 1 during operation. Other details are the same as those in the first embodiment and are not described herein again.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The technical solution of the present invention can be used by anyone skilled in the art to make many possible variations and modifications, or to modify equivalent embodiments, without departing from the scope of the technical solution of the present invention, using the technical content disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention should fall within the protection scope of the technical solution of the present invention.

Claims

1. The drying box is characterized by comprising a box body (1) and a cavity formed by enclosing the box body (1), wherein a partition plate (101) is arranged in the cavity and used for dividing the cavity into a first cavity (112) and a second cavity (113) which are arranged up and down; one end of the first cavity (112) is provided with a sample introduction door (6), the box body (1) is provided with a heating cavity (2) relative to one end of the sample introduction door (6), the heating cavity (2) is respectively communicated with the first cavity (112) and the second cavity (113), a blast heating assembly (3) is arranged in the heating cavity (2), one side of the partition plate (101) close to the sample introduction door (6) is provided with an air return hole (1011) for communicating the first cavity (112) with the second cavity (113), and the first cavity (112), the heating cavity (2), the second cavity (113) and the air return hole (1011) are sequentially communicated to form a circulating air duct; an air inlet assembly (5) is arranged in the first chamber (112) or the second chamber (113).

2. A drying cabinet according to claim 1, characterized in that the blowing and heating assembly (3) comprises a blowing assembly (301) and a heating assembly (302), the blowing assembly (301) comprises a cross flow fan (3011), and the cross flow fan (3011) is arranged in a direction corresponding to the width direction of the first chamber (112) or the second chamber (113) for blowing a uniform parallel wind into the first chamber (112) or the second chamber (113).

3. A drying cabinet according to claim 2, characterized in that the cross-flow fan (3011) has an outlet width equal to the width of the first chamber (112) or the second chamber (113).

4. A drying cabinet according to claim 2 or 3, characterized in that the heating assembly (302) is located at the communication of the heating chamber (2) with the first chamber (112) or the second chamber (113) for heating the gas.

5. A drying cabinet according to claim 4, characterized in that the heating assembly (302) is a PTC heating plate (3021) and matches the shape of the communication.

6. A drying cabinet according to claim 5, characterized in that the blower assembly (301) and the heating assembly (302) are both located on a mounting plate (201).

7. A drying cabinet according to claim 4, characterized in that when the heating assembly (302) is located at the communication between the heating chamber (2) and the first chamber (112), a flow mixing plate (303) is provided directly in front of the heating assembly (302).

8. A drying cabinet according to claim 2 or 3, characterized in that a temperature detection member (4) is provided in the first chamber (112) or the second chamber (113) for detecting the temperature of the gas in the corresponding chamber; the heating assembly (302) is connected with the temperature detection piece (4) and used for receiving the detected gas temperature value to perform heating regulation so as to maintain the gas temperature in the corresponding cavity within a constant range.

9. The drying cabinet according to claim 8, characterized in that the temperature detecting member (4) comprises a fixing base (402) and a temperature measuring probe (401), the fixing base (402) is detachably connected to the cabinet (1), and the temperature measuring probe (401) is installed in the fixing base (402).

10. A drying box according to claim 1, 2 or 3, characterized in that the air inlet assembly (5) comprises an elongated air distributor (501), the air distributor (501) being arranged in a direction perpendicular to the arrangement direction of the circulating air ducts.

11. Drying cabinet according to claim 1 or 2 or 3, characterized in that the sample inlet door (6) comprises a door panel (601), and the upper end of the door panel (601) is mounted on the cabinet (1) by a hinge (602) so that the door panel (601) is pushed by external force to turn open towards the inside of the cabinet (1) or fall back and close under the action of gravity.

12. Drying box according to claim 1 or 2 or 3, characterised in that the box (1) is provided with a vent (110) communicating with the outside.

13. The drying cabinet of claim 12, wherein a butterfly bolt (111) is disposed at one side of the exhaust hole (110) for opening and closing and adjusting the opening of the exhaust hole (110).