CN212566529U - Efficient drying room for drying EPP (expanded polypropylene) products - Google Patents

Abstract

The utility model discloses a high-efficiency drying room for drying EPP products, which comprises a room body built on the ground and a steam supply pipeline for conveying steam to the room body from a steam supply source, and is characterized in that a concave cavity is dug on the ground in the room body, and a cover plate provided with meshes is covered on the concave cavity; the air circulation heat dissipation device comprises a fan and a heat dissipation air box outside the house body, a bottom air pipe arranged in the cavity and provided with an air supply outlet, an S-shaped threaded heat dissipation pipe arranged below the bottom air pipe, and an overhead air pipe arranged at the top in the house body and provided with an air return inlet. The heat dissipation air box is provided with an air box air inlet connected with an air outlet of the fan and an air box air outlet connected with the bottom air pipe through a pipeline. The air inlet of the fan is connected with the overhead air pipe through a pipeline. An S-shaped heat dissipation copper pipe is arranged in the heat dissipation air box, one end of the S-shaped heat dissipation copper pipe is connected with the steam supply pipeline, and the other end of the S-shaped heat dissipation copper pipe is connected with the S-shaped threaded heat dissipation pipe through a pipeline. The drying room has better drying uniformity of EPP products, higher drying efficiency, less steam consumption and reduced production cost.

Description

Efficient drying room for drying EPP (expanded polypropylene) products

Technical Field

The utility model relates to a EPP product is dried and is used high-efficient baking house.

Background

In the known technology, after EPP is granulated by an extrusion method and manufactured into a product through a forming machine and a die, the product is often dried in a concentrated manner at the end due to moisture on the product, and the drying process is also a process for further curing the EPP, so that the internal stress of the EPP can be eliminated, and the product structure is more stable. The current practice is to discharge the product onto a cart rack and place it in a drying room for drying.

The traditional drying room is characterized in that air openings are formed in the periphery of a room body, and EPP products are dried in a natural air flowing mode, but the traditional drying room has the defects that the efficiency is too low, the temperature is not well controlled, and the delivery time is influenced.

Therefore, the design of steam drying is introduced in the prior art, namely, steam radiating pipelines are arranged around the drying room, and the steam is supplied by a self-arranged boiler or a pipeline of a thermal power plant. Inside releasing the baking house through the heat that the radiator contains steam to install the fan additional and introduce external air current and strengthen the heat distribution, dry the EPP product, compare original natural wind stoving mode and did improve efficiency, still there is following shortcoming when actually implementing:

(1) the hot air in the drying room is unevenly distributed, so that EPP products in the drying room are unevenly heated, and the drying time is not uniform. The EPP products at the periphery are often dried, but the products in the middle area are still wet, so that the shipment uniformity of the same batch of products is greatly influenced; repeated drying operations are often required.

(2) The external air current that the fan introduced often mingles with moisture, when disturbance steam, the stoving efficiency of the steam that weakens on the contrary has reduced the drying efficiency of product to influence the curing effect of product.

(3) Because drying efficiency is low, the temperature rises slowly, and efficiency is poor, current baking house often need prolong the stoving time, increases the steam quantity, leads to the manufacturing cost increase of enterprise.

Disclosure of Invention

The utility model discloses the purpose is: the efficient drying room for drying the EPP products is provided, the drying uniformity of the EPP products is better, the drying efficiency is higher, and the curing quality of the products is favorably improved; meanwhile, the steam consumption can be saved, and the production cost of enterprises is reduced.

The technical scheme of the utility model is that: an efficient drying room for drying EPP products comprises a room body built on the ground and a steam supply pipeline for conveying steam to the room body from a steam supply source, and is characterized in that a concave cavity is dug in the ground in the room body, a cover plate provided with meshes is covered on the concave cavity, and the cover plate is supported by a support arranged on the bottom surface of the concave cavity;

the heat dissipation device comprises a room body, and is characterized by also comprising an airflow circulating heat dissipation mechanism, wherein the mechanism comprises a fan and a heat dissipation air box which are arranged outside the room body, the fan is provided with a fan air inlet and a fan air outlet, the heat dissipation air box is provided with an air box air inlet, an air box air outlet, a steam inlet and a steam outlet, an S-shaped heat dissipation copper pipe is arranged in an inner cavity of the heat dissipation air box, one end of the S-shaped heat dissipation copper pipe is connected with a steam supply pipeline through the steam inlet, the other end of the S-shaped heat;

the air box is characterized by also comprising a bottom air pipe arranged in the cavity and an overhead air pipe arranged at the top in the room body, wherein an air outlet of the air box is communicated with an inlet of the bottom air pipe through an air supply pipe, a plurality of air supply ports are formed in the bottom air pipe, the overhead air pipe is connected with an air inlet of the fan through a return air pipe, and a plurality of return air ports are formed in the overhead air pipe;

the heat dissipation air box is characterized by further comprising an S-shaped threaded heat dissipation pipe which is arranged in the concave cavity and is horizontally arranged above the bottom air pipe, and a steam outlet in the heat dissipation air box is connected with an inlet at the front end of the S-shaped threaded heat dissipation pipe through a steam conveying pipeline.

Further, the utility model discloses in still include the PLC controller, locate the internal temperature sensor in room and locate steam supply solenoid valve on the steam supply pipe, and the fan is the frequency conversion fan, and temperature sensor, steam supply solenoid valve and frequency conversion fan all are connected with the PLC controller electricity. The PLC is internally preset with a temperature range for the drying room to work, and the temperature range has the lowest critical working temperature and the highest critical working temperature. The temperature sensor is used for detecting the temperature in the drying room in real time, and when the detected temperature is lower than the lowest critical working temperature, the PLC sends a signal to increase the rotating speed of the fan so as to increase the temperature in the drying room; and when the detected temperature is higher than the preset highest critical working temperature, the PLC sends a signal to reduce the rotating speed of the fan so as to reduce the temperature in the house.

Further, in the utility model discloses in the end-to-end connection of S-shaped screw thread cooling tube has the drain pipe, and this drain pipe links to each other with the underground drainage pipe network to be equipped with drainage solenoid valve on the drain pipe, this drainage solenoid valve also is connected with the PLC controller electricity. After the airflow circulating heat dissipation mechanism operates for a certain time, the PLC controls to open the water discharge electromagnetic valve, and water in the S-shaped threaded heat dissipation pipe is discharged to the underground drainage pipe network by utilizing the output airflow of the fan, so that the influence of accumulated water in the S-shaped threaded heat dissipation pipe on the heat dissipation working efficiency is prevented.

Further, in the utility model discloses in be equipped with a plurality of radiating fin around S-shaped heat dissipation copper pipe on the heat dissipation bellows inner wall. The introduction of the heat dissipating fins can enhance the dissipation of heat inside the heat dissipating bellows.

Further, the utility model discloses in be fixed with the affiliated support horizontal pole of a plurality of parallels on the support and be used for supporting S-shaped screw thread cooling tube, and tie up tight fixed S-shaped screw thread cooling tube through the clamp on the affiliated support horizontal pole.

Further, in the present invention, the supply-air outlet is disposed at the left and right sides of the bottom-mounted air pipe.

Further, in the utility model discloses in the bottom of overhead tuber pipe and below is put the tuber pipe just to setting up, just the return air inlet sets up the bottom at the overhead tuber pipe.

Further, in the utility model discloses in room body top is all located to fan and heat dissipation bellows, bellows air intake and the horizontal relative distribution of bellows air outlet on the heat dissipation bellows, and steam inlet and steam outlet vertically set up, and upper and lower staggered arrangement.

Further, in the utility model discloses in the pipe diameter of S-shaped heat dissipation copper pipe is less than the pipe diameter of S-shaped screw thread cooling tube.

The working principle of the utility model is as follows:

the EPP products to be dried are placed on the cart and pushed into the house body by workers according to the needs, and are arranged on the cover plate with the meshes in a row in order.

Then sequentially opening a steam supply electromagnetic valve and a fan through a PLC (programmable logic controller) to enable the airflow circulating heat dissipation mechanism to operate; the steam supply source in the utility model is derived from the factory building boiler or is transported by the thermal power plant like the conventional technology. Steam is sent into the heat dissipation bellows through steam supply pipe, through the preliminary heat dissipation of S-shaped heat dissipation copper pipe, releases some heat, and this part heat is carried by the air current that the fan produced, forms hot-blast quilt and is sent into in the end puts the bellows.

Meanwhile, steam is continuously sent into the S-shaped threaded radiating pipe below the ground of the room body through the steam conveying pipeline, and heat is completely released through the S-shaped threaded radiating pipe. And the hot air fed into the bottom air pipe from the front is blown out by the air supply outlet to form upward air flow, so that the heat released by the S-shaped threaded radiating pipe is driven to move upwards, and the EPP product is dried.

The air current upwards gets into the overhead tuber pipe at the internal top in room through the return air inlet, returns the fan via the return air pipe at last, blows off from the fan air outlet again to this incessantly circulation forms the endless disturbance's of incessant circulation air current, spreads the heat equilibrium in the room to every corner, makes everywhere EPP product all fully heated, thereby lasts effectual stoving to the EPP product.

The temperature sensor also continuously operates in the drying process, and the temperature in the house body is detected in real time. The PLC is internally preset with a temperature range for the drying room to work, and the temperature range has the lowest critical working temperature and the highest critical working temperature. The temperature sensor is used for detecting the temperature in the house in real time, and when the detected temperature is lower than the lowest critical working temperature, the PLC sends a signal to increase the rotating speed of the fan so as to increase the temperature in the house; and when the detected temperature is higher than the preset highest critical working temperature, the PLC sends a signal to reduce the rotating speed of the fan so as to reduce the temperature in the house.

When the preset drying time is reached, the PLC sends a signal to sequentially close the fan and the steam supply electromagnetic valve, so that the air flow circulation heat dissipation mechanism stops running.

The utility model has the advantages that:

1. the utility model discloses a design special air current circulation heat dissipation mechanism and dry the EPP product, this kind of air current circulation heat dissipation mechanism is better to the stoving homogeneity of EPP product, and drying efficiency is higher, not only is favorable to improving product curing quality to can furthest ensure the shipment uniformity of same batch product, avoid the operation of drying repeatedly among the prior art.

2. The utility model provides an air current circulation heat dissipation mechanism ensures that steam is by make full use of, heat dissipation bellows wherein is through arranging the release of some heats of S-shaped heat dissipation copper pipe with steam, this part heat participates in the circulation of fan air current, and the S-shaped screw thread cooling tube of apron below then fully releases the surplus heat of steam, and carry by the fan air current, together dry the EPP product with the heat in the fan air current, accelerate the internal temperature in room and rise, the stoving is fast, high efficiency, avoid increaseing the steam quantity, thereby be favorable to practicing thrift the manufacturing cost of enterprise.

3. The utility model discloses in with the help of the inside S-shaped heat dissipation copper pipe release part steam heat of heat dissipation bellows, this part heat participates in the circulation of fan air current, forms the hot-blast circulation that does not stop the disturbance promptly, avoids introducing the external air current that is mingled with moisture among the known art to implement the interference to the stoving operation.

4. The utility model provides a form the circulating air current of the incessant disturbance during air current circulation heat dissipation mechanism function, with the internal heat equilibrium of room spread to every corner, make EPP product everywhere all fully heated to last effectual stoving to the EPP product.

5. The utility model discloses when concrete implementation, place S-shaped screw thread cooling tube and end and put the tuber pipe through digging the cavity at the internal ground in room, compare the form that originally arranges steam heat dissipation pipeline all around in the internal portion in room, can release the internal space in room on the contrary, increase stoving volume. And the house body is not required to be enlarged or modified, so that the modification cost can be saved. Simultaneously, the S-shaped threaded radiating pipe is arranged underground, and is more convenient to install compared with the original mode of arranging the S-shaped threaded radiating pipe around.

6. The utility model discloses in come the temperature control of baking house work at the within range that needs through frequency conversion fan, temperature sensor and PLC controller mutual cooperation to better control oven-dry mass, and promote the utility model discloses holistic degree of automation.

7. The utility model discloses in the end-to-end connection at S-shaped screw thread cooling tube has the drain pipe, and this drain pipe links to each other with the underground drainage pipe network to be equipped with drainage solenoid valve on the drain pipe, this drainage solenoid valve also is connected with the PLC controller electricity. After the airflow circulating heat dissipation mechanism operates for a certain time, the PLC controls to open the water discharge electromagnetic valve, and water in the S-shaped threaded heat dissipation pipe is discharged to the underground drainage pipe network by utilizing the output airflow of the fan, so that the influence of accumulated water in the S-shaped threaded heat dissipation pipe on the heat dissipation working efficiency is prevented.

Drawings

The invention will be further described with reference to the following drawings and examples:

FIG. 1 is a front view of the structure of the present invention;

FIG. 2 is a top view of the S-shaped threaded heat pipe of the present invention;

FIG. 3 is a top view of the middle bottom mounted air duct of the present invention;

fig. 4 is a bottom view of the top-mounted air duct of the present invention.

Wherein: 1. a house body; 2. a steam supply pipe; 3. a concave cavity; 4. a cover plate; 5. a support; 6. a fan; 6a, a fan air inlet; 6b, a fan air outlet; 7. a heat dissipation air box; 7a, an air inlet of the air box; 7b, an air outlet of the air box; 7c, a steam inlet; 7d, a steam outlet; 8. s-shaped heat dissipation copper pipes; 9. a bottom air pipe is arranged; 9a, arranging an air pipe inlet at the bottom; 9b, an air supply outlet; 10. an air pipe is arranged at the top; 10a, an air return opening; 11. an air supply pipe; 12. a return air duct; 13. the S-shaped threaded radiating pipe; 14. a steam delivery conduit; 15. a temperature sensor; 16. a steam supply solenoid valve; 17. a drain pipe; 18. a water discharge electromagnetic valve; 19. a heat dissipating fin; 20. an auxiliary support rail; 21. pushing a cart; 22. EPP products.

Detailed Description

Example (b): the specific implementation of the efficient drying room for drying the EPP product provided by the present invention is described as follows with reference to the drawings of FIG. 1-FIG. 4:

referring first to fig. 1, the efficient drying room for drying EPP products, like the conventional art, has a room body 1 built on the ground and a steam supply pipe 2 for supplying steam from a steam supply source to the room body 1, and a rolling door (not shown) is installed at one side of the room body 1 for a trolley 21 loaded with EPP products 22 to enter and exit. The steam supply pipe 2 is connected to a steam output line of the thermal power plant to which steam is supplied.

The utility model discloses a core improves and does: a concave cavity 3 is dug in the ground in the house body 1, a cover plate 4 provided with meshes is covered on the concave cavity 3, and the cover plate 4 is supported by a bracket 5 arranged on the bottom surface of the concave cavity 3; meanwhile, an airflow circulation heat dissipation mechanism is designed. The airflow circulating heat dissipation mechanism is composed of a fan 6 and a heat dissipation air box 7 which are arranged at the top of a room body 1, a bottom air pipe 9 arranged in a cavity 3, an overhead air pipe 10 arranged at the top of the room body 1, an S-shaped threaded heat dissipation pipe 13 arranged in the cavity 3 and horizontally arranged above the bottom air pipe 9, an air supply pipe 11, an air return pipe 12, a steam conveying pipeline 14, a temperature sensor 15, a steam supply electromagnetic valve 16, a water drain pipe 17, a water drain electromagnetic valve 18 and a PLC (not shown in the figure) together.

Specifically, as shown in fig. 1, the fan 6 has a fan inlet 6a and a fan outlet 6b, the heat dissipation air box 7 is provided with an air box inlet 7a, an air box outlet 7b, a steam inlet 7c and a steam outlet 7d, an inner cavity of the heat dissipation air box 7 is provided with an S-shaped heat dissipation copper pipe 8, one end of the S-shaped heat dissipation copper pipe 8 is connected with the steam supply pipe 2 through the steam inlet 7c, the other end of the S-shaped heat dissipation copper pipe 8 is connected with the steam outlet 7d, and the fan outlet 6b is connected with the air box inlet 7 a.

The air outlet 7b of the air box is communicated with the bottom air pipe inlet 9a of the bottom air pipe 9 through an air supply pipe 11, meanwhile, a plurality of air supply outlets 9b are formed in the bottom air pipe 9, the top air pipe 10 is connected with the air inlet 6a of the fan through an air return pipe 12, and a plurality of air return inlets 10a are formed in the top air pipe 10;

the S-shaped threaded radiating pipe 13 is tiled below the cover plate 4 of the whole house body 1 to cover the ground of the whole house body 1, and the use specification of the S-shaped threaded radiating pipe is determined according to the bottom area of the house body 1. The S-shaped threaded heat pipe 13 in this embodiment has nine bends. The steam outlet 7d of the radiating air box 7 is connected with the front inlet of the S-shaped threaded radiating pipe 13 through a steam conveying pipeline 14.

Still as shown in fig. 1, the temperature sensor 15 is fixed on the wall of the house 1, the steam supply solenoid valve 16 is arranged on the steam supply pipeline 2, the fan 6 in this embodiment is a variable frequency fan, and the temperature sensor 15, the steam supply solenoid valve 16 and the variable frequency fan are all electrically connected with the PLC controller.

As shown in fig. 2, the end of the S-shaped threaded radiating pipe 13 is connected with a drain pipe 17, the drain pipe 17 is connected with an underground drainage pipe network, and the drain pipe 17 is provided with the drain solenoid valve 18, and the drain solenoid valve 18 is also electrically connected with the PLC controller.

In this embodiment, a plurality of heat dissipation fins 19 are disposed on the inner wall of the heat dissipation bellows 7 around the S-shaped heat dissipation copper pipe 8. The introduction of the heat dissipating fins 19 can enhance the dissipation of heat inside the heat dissipating wind box 7.

As shown in fig. 2, four parallel auxiliary support cross bars 20 are fixed on the bracket 5 for supporting the S-shaped threaded radiating pipe 13, and the auxiliary support cross bars 20 are fastened and fixed on the S-shaped threaded radiating pipe 13 by means of clips (not shown).

Referring to fig. 1 and 3, the air blowing ports 9b are provided on both left and right sides of the bottom air duct 9, and the number of the air blowing ports 9b on each side of the bottom air duct 9 is 9.

The top air duct 10 is disposed opposite to the bottom air duct 9 below, and as shown in fig. 4, the air return openings 10a are disposed at the bottom of the top air duct 10, and the number of the air return openings is 12.

In the present embodiment, the air box inlet 7a and the air box outlet 7b of the heat dissipation air box 7 are transversely distributed oppositely, and the steam inlet 7c and the steam outlet 7d are longitudinally arranged and are arranged in a vertically staggered manner. And the pipe diameter of the S-shaped radiating copper pipe 8 is smaller than that of the S-shaped threaded radiating pipe 13.

The working principle of the utility model is as follows:

the EPP products 22 to be dried are put on the cart 21 and pushed into the house body 1 by workers as required, and are arranged on the cover plate 4 with the meshes in a row.

Then, the steam supply electromagnetic valve 16 and the fan 6 are sequentially opened through the PLC, so that the airflow circulating heat dissipation mechanism operates; steam is sent into a heat dissipation air box 7 through a steam supply pipeline 2, and is subjected to preliminary heat dissipation by an S-shaped heat dissipation copper pipe 8, so that a part of heat is released, and is conveyed by airflow generated by a fan 6 to form hot air which is sent into a bottom air pipe 9.

Meanwhile, the steam is continuously sent to the S-shaped threaded radiating pipe 13 below the ground of the room body 1 through the steam delivery pipe 14, and the heat is completely released through the S-shaped threaded radiating pipe 13. The hot air fed into the bottom air duct 9 from the front is blown out by the air supply opening 9b to form an upward air flow, and the heat released by the S-shaped threaded radiating pipe 13 is driven to move upward to dry the EPP product 22.

The air current upwards gets into the overhead tuber pipe 10 at the top in the room body 1 through return air inlet 10a, gets back to fan 6 through return air pipe 12 at last, blows off from fan air outlet 6b again to this incessantly circulates, forms incessantly disturbed circulation air current, distributes the heat in the room body 1 to every corner in a balanced way, makes EPP product 22 everywhere all fully heated, thereby lasts effectual stoving to EPP product 22.

The temperature sensor 15 also continuously operates in the drying process to detect the temperature in the house body 1 in real time. The temperature range of the drying room working is preset in the PLC, such as 75-85 ℃, and the temperature range has a minimum critical working temperature of 75 ℃ and a maximum critical working temperature of 85 ℃. The temperature sensor 15 is used for detecting the temperature in the house body 1 in real time, and when the detected temperature is lower than the lowest critical working temperature, the PLC sends a signal to increase the rotating speed of the fan 6 so as to increase the temperature in the house body 1; and when the detected temperature is higher than the preset highest critical working temperature, the PLC sends a signal to reduce the rotating speed of the fan 6 so as to reduce the temperature in the room body 1.

When the preset drying time is reached, such as 12 hours, the PLC sends signals to sequentially close the fan 6 and the steam supply electromagnetic valve 16, so that the air flow circulation heat dissipation mechanism stops running.

The above-mentioned embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which should not be construed as limiting the scope of the present invention. All modifications made according to the spirit of the main technical scheme of the present invention shall be covered within the protection scope of the present invention.

Claims (9)

1. An efficient drying room for drying EPP products comprises a room body (1) built on the ground and a steam supply pipeline (2) for conveying steam from a steam supply source to the room body (1), and is characterized in that a concave cavity (3) is dug in the room body (1), a cover plate (4) provided with meshes is covered on the concave cavity (3), and the cover plate (4) is supported by a support (5) arranged on the bottom surface of the concave cavity (3);

the heat dissipation device is characterized by further comprising an airflow circulating heat dissipation mechanism, the mechanism comprises a fan (6) and a heat dissipation air box (7) which are arranged outside the room body (1), the fan (6) is provided with a fan air inlet (6 a) and a fan air outlet (6 b), the heat dissipation air box (7) is provided with an air box air inlet (7 a), an air box air outlet (7 b), a steam inlet (7 c) and a steam outlet (7 d), an S-shaped heat dissipation copper pipe (8) is arranged in an inner cavity of the heat dissipation air box (7), one end of the S-shaped heat dissipation copper pipe (8) is connected with the steam supply pipeline (2) through the steam inlet (7 c), the other end of the S-shaped heat dissipation copper pipe (8) is connected with the steam outlet (7 d), and the fan air outlet (6;

the air box is characterized by further comprising a bottom air pipe (9) arranged in the cavity (3) and a top air pipe (10) arranged at the top in the room body (1), wherein an air outlet (7 b) of the air box is communicated with a bottom air pipe inlet (9 a) of the bottom air pipe (9) through an air supply pipe (11), a plurality of air supply openings (9 b) are formed in the bottom air pipe (9), the top air pipe (10) is connected with a fan air inlet (6 a) through an air return pipe (12), and a plurality of air return openings (10 a) are formed in the top air pipe (10);

the steam-cooling air box is characterized by further comprising an S-shaped threaded heat-radiating pipe (13) which is arranged in the cavity (3) and is horizontally arranged above the bottom air-supply pipe (9), and a steam outlet (7 d) on the heat-radiating air box (7) is connected with an inlet at the front end of the S-shaped threaded heat-radiating pipe (13) through a steam conveying pipeline (14).

2. The EPP product drying efficient drying room according to claim 1, further comprising a PLC, a temperature sensor (15) arranged in the room body (1) and a steam supply electromagnetic valve (16) arranged on the steam supply pipeline (2), wherein the fan (6) is a variable frequency fan, and the temperature sensor (15), the steam supply electromagnetic valve (16) and the variable frequency fan are electrically connected with the PLC.

3. The efficient drying room for drying EPP products, as claimed in claim 2, wherein the end of said S-shaped threaded heat dissipating pipe (13) is connected with a drain pipe (17), said drain pipe (17) is connected with an underground drain pipe network, and a drain solenoid valve (18) is arranged on said drain pipe (17), said drain solenoid valve (18) is also electrically connected with the PLC controller.

4. The efficient drying room for drying EPP products according to claim 1, wherein a plurality of heat dissipating fins (19) are arranged on the inner wall of the heat dissipating air box (7) around the S-shaped heat dissipating copper pipe (8).

5. The efficient drying room for drying EPP products, as claimed in claim 1, wherein a plurality of parallel auxiliary supporting cross bars (20) are fixed on the support (5) for supporting the S-shaped threaded heat dissipation pipes (13), and the S-shaped threaded heat dissipation pipes (13) are fastened and fixed on the auxiliary supporting cross bars (20) by means of hoops.

6. The efficient drying room for drying EPP products according to claim 1, wherein said air supply outlets (9 b) are provided on the left and right sides of the bottom air duct (9).

7. The EPP product drying efficient drying room as claimed in claim 6, wherein said top air duct (10) is disposed opposite to the lower bottom air duct (9), and said air return opening (10 a) is disposed at the bottom of the top air duct (10).

8. The EPP product drying efficient drying room as claimed in claim 1, wherein the fan (6) and the heat dissipation air box (7) are both arranged at the top of the room body (1), the air box air inlet (7 a) and the air box air outlet (7 b) on the heat dissipation air box (7) are transversely and oppositely distributed, and the steam inlet (7 c) and the steam outlet (7 d) are longitudinally arranged and are arranged in a vertically staggered manner.

9. The efficient drying room for drying EPP products as claimed in claim 1, wherein the pipe diameter of said S-shaped radiating copper pipe (8) is smaller than that of said S-shaped threaded radiating pipe (13).

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