CN110553476B - Drying box - Google Patents

Abstract

The invention discloses a drying oven, which comprises an oven body and a main cavity formed by encircling the oven body, wherein one end of the oven body is provided with a sample inlet door, the opposite end of the sample inlet door is provided with a heating cavity communicated with the main cavity, a blast heating assembly is arranged in the heating cavity, both sides of the main cavity are provided with return air channels, air inlets of the return air channels are communicated with the heating cavity, air outlets of the return air channels are positioned at both sides close to the sample inlet door and are communicated with the main cavity, and the main cavity, the heating cavity and the two return air channels are sequentially communicated to form a circulating air channel; and an air inlet component facing the heating cavity is arranged on one side of the sample inlet door of the main cavity. The drying box has the advantages of simple and compact structure, high drying efficiency, small volume and the like.

Description

Drying box

Technical Field

The invention mainly relates to the technical field of full moisture determination of samples, in particular to a drying oven.

Background

For the determination of the total moisture of the coal sample, the drying of the sample and the verification of the weight of the sample are the most important two links, particularly the advantages and disadvantages of a drying box directly affect the drying efficiency and the compliance of the drying environment, particularly the latest line standard requirements put forward higher requirements on the drying box, and the forced nitrogen passing requirements are further put forward on the lignite line standard.

The traditional drying cabinet adopts the mode of light wave heating, the temperature control degree of difficulty is big and the temperature fluctuation is obvious, the phenomenon that the surface coal sample is too dry and the inner layer coal sample is not thoroughly dried often appears in adopting the light wave heating mode to gluing coal or high density coal sample simultaneously, the national standard is not satisfied and the drying mode requirement of full water is surveyed to the coal sample, the traditional drying cabinet is very big simultaneously, under the condition of the forced nitrogen-introducing drying of lignite at the latest standard, the gas consumption is very big to the nitrogen gas, simultaneously also be difficult to guarantee that the nitrogen concentration reaches 99.9% in the drying cabinet, simultaneously the temperature in the big drying cabinet is difficult to guarantee the cavity within the qualification value scope, moreover, the traditional drying cabinet is difficult to discharge fast because the gas exchange speed is insufficient, lead to drying efficiency lower.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides the drying box with simple, compact and ingenious structure and good drying effect.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

The utility model provides a drying cabinet, includes the box and encloses the main cavity that closes the formation by the box, the one end of box is equipped with the introduction door, the opposite one end of introduction door is provided with the heating chamber with main cavity intercommunication, be provided with blast heating element in the heating chamber, the both sides of main cavity all are provided with the return air passageway, each the air inlet of return air passageway all with the heating chamber intercommunication, each the gas outlet of return air passageway is located and is close to the both sides of introduction door, and all with main cavity intercommunication, main cavity, heating chamber and two return air passageway communicate in proper order and form the circulation wind channel; and an air inlet component facing the heating cavity is arranged on one side of the sample inlet door of the main cavity.

As a further improvement of the above technical scheme:

The heating cavity is internally provided with an exhaust hole communicated with the outside of the box body.

One side of the exhaust hole is provided with a movable baffle for opening and closing the exhaust hole and adjusting the opening.

The blast heating assembly comprises a blast assembly and a heating assembly; the air blast assembly comprises a centrifugal fan and centrifugal fan blades; the centrifugal fan is arranged on the outer side of the box body, and the centrifugal fan blades are arranged in the heating cavity and connected with the centrifugal fan; and the main chamber is provided with an air inlet of the heating cavity at the inner circle of the centrifugal fan blade.

The heating component is positioned at one side or two sides of the air blowing component in the heating cavity and is used for heating the air.

The heating component is a PTC heating plate.

The shape of the PTC heating piece is matched with that of the heating cavity, and a wind shield is arranged at a connecting terminal of the PTC heating piece in the heating cavity.

The air blast component and the heating component are both positioned on the mounting plate at one side of the box body.

And the inner side of the mounting plate is paved with a heat insulation plate.

A temperature detection piece is arranged in the box body and used for detecting the temperature of the gas in the main cavity; the heating component is connected with the temperature detection piece and is used for receiving the detected gas temperature value to carry out heating adjustment so as to maintain the gas temperature in the main cavity within a constant range.

The temperature detection part comprises a fixing seat and a temperature measurement probe, wherein the fixing seat is detachably connected to the side wall of the return air channel, and the temperature measurement probe is installed in the fixing seat.

The air outlet of each return air channel comprises a plurality of vertical strip-shaped holes, and the length of each strip-shaped hole is sequentially shortened along the air conveying direction.

The air outlets of the return air channels are provided with mixed flow plates, and the mixed flow plates are opposite to the air outlets of the return air channels.

The gas inlet assembly comprises a strip gas distributor, and the gas distributor is arranged along the arrangement direction of the sample inlet door.

The sample introduction 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 can be turned over and opened in the box body under the pushing of external force or can be closed by falling back under the action of gravity.

The inner side of the door plate is provided with a heat insulation layer.

The lower end edge of the door plate is in an arc transition shape.

And a heat insulation layer is paved on the outer layer of the box body.

The section of the main cavity close to the heating cavity gradually contracts towards the heating cavity.

Compared with the prior art, the invention has the advantages that:

according to the drying box, the air is circularly heated through the air blast heating component, so that the heating effect is good; the main chamber, the heating chamber and the two-side return air channels are adopted to form the circulating air channel, the structure is simple, compact and ingenious, the gas circulation period is short, and the drying effect is good.

According to the drying box disclosed by the invention, the exhaust hole communicated with the outside is arranged in the heating cavity, so that air can be conveniently exhausted, and the requirements of nitrogen concentration on nitrogen-introducing drying operation and the like are met. In addition, the exhaust holes are also convenient for discharging water vapor, so that the drying efficiency is improved, and finally, the nitrogen consumption and the drying efficiency are ensured to be in a reasonable interval.

According to the drying box, the temperature detection piece is arranged in the box body and used for detecting the gas temperature in the main cavity so as to heat and regulate the heating component, so that the gas temperature in the main cavity is maintained in a constant range.

According to the drying box disclosed by the invention, the air outlet of each air return channel comprises a plurality of vertical strip-shaped holes, and the lengths of the strip-shaped holes are sequentially shortened along the air conveying direction, so that the whole air outlet is V-shaped, hot air flows in the air return channels can be uniformly mixed, and the temperature difference of the air outlets is reduced; further, the air outlets of the air return channels are provided with mixed flow plates for uniformly mixing the hot air again, so that the temperature difference of the air at each position is further reduced, and the temperature in the whole main cavity is ensured to be within a reasonable range.

The drying box provided by the invention has the advantages that the shape of the box body is compatible with the drying of coal samples with the size of 6mm and 13mm, and the drying box can be flexibly configured according to the requirements of customers. In addition, the whole flat form that is of box, and the one section that the main cavity is close to the heating chamber contracts to the heating chamber gradually, not only is convenient for the circulation of gas in the main cavity, can guarantee simultaneously that the shape and the inner space of box are minimum, reduces the consumption of nitrogen gas under the circumstances of guaranteeing drying efficiency, has practiced thrift the required consumptive material cost of dry operation.

Drawings

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

Fig. 2 is a diagram showing the construction of the inside of the case in the embodiment of the present invention.

Fig. 3 is an internal structural view of the present invention in an embodiment.

Fig. 4 is a block diagram of one of the blower assembly and the heating assembly in an embodiment of the present invention.

FIG. 5 is a second block diagram of a blower assembly and a heating assembly in an embodiment of the invention.

Fig. 6 is a structural view of the air outlet of the return air duct in the embodiment of the present invention.

Fig. 7 is a structural view of a temperature sensing member in an embodiment of the present invention.

Fig. 8 is a structural view of an air intake assembly in an embodiment of the invention.

Fig. 9 is a block diagram of a sample gate in an embodiment of the invention.

The reference numerals in the figures denote: 1. a blast heating assembly; 101. a centrifugal fan; 102. centrifugal fan blades; 103. a heat insulating plate; 104. a mounting plate; 105. a wind deflector; 106. a heating assembly; 2. a circulating air duct; 201. a heating chamber; 202. a return air channel; 203. a bar-shaped hole; 204. a mixed flow plate; 205. a main chamber; 3. a sample inlet door; 301. a door panel; 302. a thermal insulation layer; 303. a hinge; 4. a temperature detecting member; 401. a temperature measurement probe; 402. a fixing seat; 5. an air intake assembly; 6. a case; 601. a heat insulation layer; 7. an exhaust hole; 701. a movable baffle.

Detailed Description

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

As shown in fig. 1 to 9, the drying oven of the present embodiment is used for drying operation in moisture measurement of samples (such as coal samples), and includes a box 6 and a main chamber 205 enclosed by the box 6, one end of the box 6 is provided with a sample inlet door 3, an opposite end of the sample inlet door 3 is provided with a heating cavity 201 communicated with the main chamber 205, and a blast heating component 1 is arranged in the heating cavity 201, wherein the blast heating component 1 includes a blast component and a heating component 106; the two sides of the main chamber 205 are provided with air return channels 202, the air inlets of the air return channels 202 are communicated with the heating cavity 201, the air outlets of the air return channels 202 are positioned at two sides close to the sample inlet door 3 and are communicated with the main chamber 205, and the main chamber 205, the heating cavity 201 and the two air return channels 202 are sequentially communicated to form a circulating air channel 2; the main chamber 205 is provided with an air inlet assembly 5 facing the heating chamber 201 at one side of the injection gate 3.

According to the drying box, the air is circularly heated through the air blast heating component 1, so that the heating effect is good; the main chamber 205, the heating chamber 201 and the two-side return air channels 202 are adopted to form the circulating air channel 2, 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. 4 and 5, in this embodiment, the heating chamber 201 is provided with an exhaust hole 7 communicated with the outside, so as to facilitate air discharge, and meet the requirement of nitrogen concentration in nitrogen-introducing drying operation, etc., specifically, when air is exhausted, the box 6 is first vacuumized and then nitrogen is filled, and of course, the above-mentioned vacuumizing and nitrogen filling method can be performed once or more times. In addition, the exhaust holes 7 are convenient for exhausting the water vapor, so that the drying efficiency is improved. Specifically, the opening and closing of the exhaust hole 7 and the opening degree can be adjusted through the movable baffle 701 on one side of the exhaust hole 7, the movable baffle 701 is rotatably installed on one side of the exhaust hole 7, and the opening degree is adjusted by manually rotating the position of the movable baffle 701, so that the nitrogen consumption and the drying efficiency are finally ensured to be in a reasonable interval.

As shown in fig. 3 to 5, in the present embodiment, the blast heating assembly 1 includes a blast assembly and a heating assembly 106; the blast assembly is used for accelerating gas circulation and improving drying efficiency. Specifically, the blower assembly includes a centrifugal blower 101 and a centrifugal blower blade 102; the centrifugal fan 101 is arranged on the outer side of the box body 6, and the centrifugal fan blades 102 are arranged in the heating cavity 201 and are connected with the centrifugal fan 101; the main chamber 205 is provided with an air inlet of the heating chamber 201 at the inner circular position of the centrifugal fan blade 102 to communicate with the main chamber 205. The centrifugal fan 101 is a high-temperature-resistant centrifugal fan, and is required to work at a high temperature under the premise of ensuring that the air quantity and the air pressure meet the ventilation times, so as to provide power for the centrifugal fan blades 102; the centrifugal fan blades 102 can accelerate the circulation of gas when rotating at high speed, and the exhaust port ring in the center of the heating cavity 201 is just inserted into the inner circle of the centrifugal fan blades 102, so that the air flow exchange effect is better ensured. Of course, in other embodiments, axial flow fan blades may be used in place of the centrifugal fan blades 102.

In this embodiment, the heating component 106 is used to heat the gas; the heating assembly 106 is located in the heating chamber 201 on one or both sides of the blower assembly. Specifically, the heating component 106 is a PTC heating plate (PTC is Positive Temperature Coefficient for short), and the shape of the PTC heating plate matches with the shape of the heating cavity 201, so as to occupy the entire cross section of the heating cavity 201. In addition, since the connecting terminal is arranged at one end of the PTC heating plate, the wind shield 105 is arranged at the connecting terminal of the heating cavity 201 and the PTC heating plate, so that the gas in the heating cavity 201 can completely pass through the heating plate, the temperature rising speed is increased, and the pressure of the gas entering the return air channel 202 can be increased. Of course, in other embodiments, other forms of heat patch are also employed, as the case may be.

In this embodiment, the centrifugal fan 101, the centrifugal fan blade 102, the PCT heating sheet and the wind shield 105 are all mounted on the mounting plate 104 on one side of the box 6, so as to form a component that can be integrally detached from the box 6, and the component is convenient to assemble and disassemble, and convenient for subsequent maintenance. In addition, the heat insulation plate 103 is paved on the inner side of the mounting plate 104, so that on one hand, the heat insulation effect is achieved, and meanwhile, the influence of heat in the heating cavity 201 on the centrifugal fan 101 can be avoided, and the normal work and the service life of the centrifugal fan are ensured.

As shown in fig. 3, in the present embodiment, a temperature detecting member 4 is provided in the case 6 for detecting the temperature of the gas in the main chamber 205; the heating assembly 106 is connected to the temperature sensing member 4 for receiving the sensed gas temperature value for heating adjustment to maintain the gas temperature in the main chamber 205 within a constant range (e.g., 105 c-110 c). Specifically, a normally closed contact of a temperature relay is connected in series in a power supply loop of the heating component 106, when the temperature detection piece 4 detects that the temperature is greater than a preset value, the action of the temperature relay is controlled (or the temperature detection piece 4 sends a temperature signal to a control unit, and the control unit sends a corresponding control instruction after temperature judgment), and the normally closed contact is disconnected, namely the heating is disconnected; of course, the heating power of the heating assembly 106 may also be adjusted. In addition, in other embodiments, the rotation speed of the centrifugal fan 101 may be adjusted according to the temperature value, so as to accelerate circulation and further improve drying efficiency. Specifically, as shown in fig. 7, the temperature detecting element 4 includes a fixing base 402 and a temperature measuring probe 401, the temperature measuring 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 air return channel 202, and the dismounting is convenient and the maintenance is convenient.

In this embodiment, the air outlet of each air return channel 202 includes a plurality of vertical strip holes 203, and the lengths of the strip holes 203 are sequentially shortened along the air conveying direction, so that the overall air outlet is V-shaped, and hot air flows in the air return channels 202 can be uniformly mixed, so that the temperature difference of the air outlets is reduced; further, the air outlet of each return air channel 202 is provided with a mixed flow plate 204, so as to uniformly mix the hot air again, further reduce the temperature difference of the air at each position, ensure the temperature in the whole main chamber 205 to be in a reasonable range, and improve the accuracy of the subsequent total moisture measurement work.

In this embodiment, the air inlet assembly 5 is used for performing nitrogen-introducing operation in the main chamber 205, and specifically includes a long gas distributor, where the gas distributor is disposed along the arrangement direction of the sample inlet door 3, the gas distributor is a long gas pipe, and a plurality of air outlet holes are disposed on the long gas pipe, and since air is introduced into the end of the long gas pipe, in order to ensure that parallel nitrogen flows are formed and ensure that the pressure and flow of nitrogen at each air outlet hole are consistent, the space between the air outlet holes is gradually shortened along the direction from the air inlet end to the other end, and the sizes of the air outlet holes (different shapes such as circular or bar) are gradually increased; meanwhile, the gas distributor is arranged at the hot gas flow reversing position of the main chamber 205, so that not only can hot gas flows at two ends rapidly heat nitrogen, but also a relatively low-pressure area is formed at the two hot gas flow reversing positions, so that the nitrogen can flow in an accelerating manner, and the nitrogen concentration in the main chamber 205 can reach the required standard concentration more rapidly.

As shown in fig. 3 and 9, in the present embodiment, the sample door 3 includes a door plate 301, and the upper end of the door plate 301 is mounted on the case 6 through a hinge 303 so that the door plate 301 is turned to open toward the inside of the case 6 by external force or is turned back to close by gravity. The door plate 301 is preferably made of stainless steel, and the lower edge of the door plate 301 is curled (for example, in a circular arc transition shape), so that the door plate 301 can smoothly transition on the crucible tray; the inner side of the door plate 301 is provided with the heat insulation layer 302, so that the outward emission of heat in the main chamber 205 is reduced, and meanwhile, the weight of the door plate 301 is increased, so that the sealing effect of the sample inlet door 3 is better ensured; the hinge 303 connects the door 301 and the box 6 by using a hinge, the hinge needs to ensure flexible movement, and the door 301 can smoothly rotate under the action of gravity. Naturally, a return spring may be provided at the hinge, so that the door panel 301 forms a certain self-closing force with the sealing material when the door panel 301 falls back and closes, and the sealing effect is further ensured.

In this embodiment, the outer layer of the box body 6 is laid with a heat insulation layer 601 for heat insulation and heat preservation, so as to reduce the influence of temperature channeling between the box bodies 6 arranged side by side.

In this embodiment, the shape of the case 6 can be compatible with the drying operation of the full moisture measurement of the 6mm and 13mm coal samples, and flexibly configured according to the needs of customers. In addition, the whole box 6 is flat, and the section of the main chamber 205 close to the heating chamber 201 gradually contracts to the heating chamber 201, so that the circulation of gas in the main chamber 205 is not only facilitated, but also the shape and the minimum internal space of the box 6 can be ensured, the consumption of nitrogen is reduced under the condition of ensuring the drying efficiency, and the consumable cost required by the drying operation is saved.

While the invention has been described with reference to preferred embodiments, it is not intended to be limiting. Many possible variations and modifications of the disclosed technology can be made by anyone skilled in the art, or equivalent embodiments with equivalent variations can be made, without departing from the scope of the invention. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention shall fall within the scope of the technical solution of the present invention.

Claims (15)

1. The utility model provides a drying cabinet, its characterized in that includes box (6) and encloses main cavity (205) that form by box (6), the one end of box (6) is equipped with advances kind door (3), advance kind door (3) relative one end be provided with main cavity (205) the heating chamber (201) of intercommunication, be provided with blast heating subassembly (1) in heating chamber (201), the both sides of main cavity (205) all are provided with return air passageway (202), the air inlet of each return air passageway (202) all with heating chamber (201) intercommunication, the gas outlet of each return air passageway (202) is located the both sides that are close to advance kind door (3), and all with main cavity (205) intercommunication, main cavity (205), heating chamber (201) and two return air passageway (202) communicate in proper order and form circulation wind channel (2); an air inlet component (5) facing the heating cavity (201) is arranged on one side of the sample inlet door (3) of the main cavity (205);

The air inlet assembly (5) comprises an elongated gas distributor, and the gas distributor is arranged along the arrangement direction of the sample inlet door (3); the gas distributor is a strip gas pipe, and a plurality of outlet holes are formed in the strip gas pipe; the gas distributor is arranged at the hot gas commutation of the main chamber (205);

A section of the main chamber (205) close to the heating chamber (201) gradually contracts towards the heating chamber (201);

The box body (6) is integrally flat;

the air outlet of each return air channel (202) comprises a plurality of vertical strip-shaped holes (203), and the length of each strip-shaped hole (203) is sequentially shortened along the air conveying direction;

the air outlets of the air return channels (202) are provided with mixed flow plates (204), and the mixed flow plates (204) are opposite to the air outlets of the air return channels (202).

2. A drying cabinet according to claim 1, wherein the heating chamber (201) is provided with an exhaust hole (7) communicating with the outside of the cabinet (6).

3. A drying oven according to claim 2, characterized in that a movable flap (701) is provided on one side of the exhaust opening (7) for opening and closing the exhaust opening (7) and for adjusting the opening.

4. A drying oven according to claim 1 or 2 or 3, characterized in that the blast heating assembly (1) comprises a blast assembly and a heating assembly (106); the blower assembly comprises a centrifugal blower (101) and a centrifugal blower blade (102); the centrifugal fan (101) is arranged on the outer side of the box body (6), and the centrifugal fan blades (102) are arranged in the heating cavity (201) and are connected with the centrifugal fan (101); the main chamber (205) is provided with an air inlet of the heating cavity (201) at the inner circle of the centrifugal fan blade (102).

5. A drying cabinet according to claim 4, wherein the heating element (106) is located at one or both sides of the blower element in the heating chamber (201) for heating the gas.

6. A drying cabinet according to claim 5, wherein the heating assembly (106) is a PTC heating plate.

7. The drying oven according to claim 6, characterized in that the PTC heating plate is shaped to match the heating chamber (201), and that the heating chamber (201) is provided with a wind deflector (105) at the connection terminal of the PTC heating plate.

8. A drying cabinet according to claim 4, wherein the blower assembly and the heating assembly (106) are each located on a mounting plate (104) on one side of the cabinet (6).

9. A drying cabinet according to claim 8, wherein the mounting plate (104) is provided with heat insulation panels (103) on the inside.

10. A drying cabinet according to claim 5, wherein a temperature detecting member (4) is provided in the cabinet (6) for detecting the temperature of the gas in the main chamber (205); the heating component (106) is connected with the temperature detection piece (4) and is used for receiving the detected gas temperature value to perform heating adjustment so as to maintain the gas temperature in the main chamber (205) within a constant range.

11. The drying cabinet according to claim 10, wherein 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 side wall of the return air channel (202), and the temperature measuring probe (401) is installed in the fixing base (402).

12. A drying oven according to claim 1,2 or 3, wherein the injection door (3) comprises a door plate (301), and the upper end of the door plate (301) is mounted on the box body (6) through a hinge (303) so that the door plate (301) is turned and opened towards the inside of the box body (6) under the pushing of external force or is closed by falling back under the action of gravity.

13. A drying cabinet according to claim 12, wherein the door panel (301) is provided on its inner side with a heat insulating layer (302).

14. A drying cabinet according to claim 12, wherein the lower edge of the door panel (301) has a rounded transition.

15. A drying cabinet according to claim 1, 2 or 3, characterized in that the outer layer of the cabinet (6) is provided with a heat insulating layer (601).