An electric heating drying oven with controllable airflow

Abstract

This utility model discloses an electrically heated drying oven with controllable airflow, including a box shell, a protective shell fixedly installed inside the box shell, and a drying chamber welded to the inner wall of the protective shell. A cavity is provided between the drying chamber and the protective shell, and an air inlet slot is opened in the middle inner wall of the drying chamber. A fan blade is rotatably installed on one side of the air inlet slot inside the cavity, and the fan blade is connected to a shaded-pole asynchronous motor through a rotating shaft. Electric heating rods distributed in a triangular pattern are installed on the side of the fan blade. This utility model effectively distributes the flowing hot air equally by setting equally spaced C-shaped baffles inside the cavity between the protective shell and the drying chamber, thereby connecting it to the rectangular exhaust holes on both sides. This ensures that the amount and temperature of the gas flowing on both sides of the drying chamber are similar, thus avoiding the difference in drying degree of items of different heights inside the drying chamber.

Description

Technical Field

[0001] This utility model relates to the field of drying oven technology, and in particular to an electrically heated drying oven with controllable airflow. Background Technology

[0002] An electric heating forced-air drying oven, also known as a "drying oven," is a device that uses electric heating to dry samples by force. Electric heating forced-air drying ovens are generally available in galvanized steel and stainless steel inner liner types, with pointer and digital displays, natural convection and forced-air circulation models, and conventional and vacuum types. They are primarily used for drying samples and can also provide the required temperature environment for experiments. They are applied in various industries such as chemical, pharmaceutical, casting, automotive, food, and machinery.

[0003] In actual use, existing electric heating drying ovens require varying exhaust volumes (or exhaust rates) depending on the items being dried and the desired level of dryness. However, adjusting the exhaust volume is inconvenient. Furthermore, when used in environments with high relative humidity, the heating of the drawn-in humid air significantly reduces drying efficiency and prolongs drying time. Additionally, the stratification of internal airflow leads to uneven heat distribution within the drying oven, resulting in varying degrees of dryness for items of different heights. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing an electrically heated drying oven with controllable airflow.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An electrically heated drying oven with controllable airflow includes a housing shell, inside which a protective shell is fixedly installed. A drying chamber is welded to the inner wall of the protective shell. A cavity is provided between the drying chamber and the protective shell. An air inlet slot is opened in the middle inner wall of the drying chamber. A fan blade is rotatably installed on one side of the air inlet slot inside the cavity. The fan blade is connected to a shaded-pole asynchronous motor via a rotating shaft. Electric heating rods arranged in a triangular pattern are installed on the side of the fan blade. Rectangular exhaust holes are evenly distributed through the inner walls of both sides of the drying chamber. C-shaped baffles are evenly distributed through the outer walls of both sides of the drying chamber. An air inlet pipe is connected to the inner wall of one side of the bottom of the protective shell. An air inlet cover is welded to the end of the air inlet pipe. An exhaust pipe is welded to the inner wall of the top of the drying chamber. A circular baffle is welded to the inner wall of the middle of the exhaust pipe. A first fan-shaped exhaust slot is opened through the outer wall of the circular baffle. A sealing cover is screwed to the top outer wall of the exhaust pipe. A PLC controller is installed on one outer wall of the housing shell.

[0007] As a further embodiment of this utility model: the inner wall of the drying chamber is welded with two sets of parallel C-shaped guide rails, and T-shaped inserts are slidably inserted into the inner wall of the C-shaped guide rails, and equidistantly distributed storage rods are welded between the two T-shaped inserts.

[0008] As a further embodiment of this utility model: a booster fan is fixed inside the air inlet hood by screws, and a drying mesh box is provided on one side of the booster fan; a filter screen is adhered to the outer wall of the end of the air inlet hood.

[0009] As a further embodiment of this utility model: the drying mesh box has a cuboid mesh structure, and the outer wall size of the drying mesh box is adapted to the inner wall size of the air inlet hood, and the inner wall of the drying mesh box is filled with activated carbon.

[0010] As a further embodiment of this utility model: a rotating shaft is rotatably provided at the top axis of the circular partition, and an adjusting circular plate is welded to the outer wall of the rotating shaft. The outer wall of the adjusting circular plate has a second fan-shaped exhaust groove that is evenly distributed.

[0011] As a further embodiment of this utility model: the size of the circular partition is the same as the size of the adjusting circular plate, and the bottom outer wall of the adjusting circular plate is in close contact with the top outer wall of the circular partition; the size of the first fan-shaped exhaust groove is the same as the size of the second fan-shaped exhaust groove, and the central angle of the first fan-shaped exhaust groove and the second fan-shaped exhaust groove are both °.

[0012] As a further embodiment of this utility model: the PLC controller is connected to a shaded-pole asynchronous motor, a booster fan, and an electric heating rod via signal lines, and the PLC controller is connected to a control switch via wires, and the control switch is connected to an external power supply via wires.

[0013] As a further improvement of this utility model: a door is hinged to one side of the outer shell of the box, and a push-button handle is provided on one side of the door. An observation window is provided in the middle of the door, and double-layered tempered glass is bonded to the inner wall of the observation window.

[0014] Compared with the prior art, this utility model provides an electrically heated drying oven with controllable airflow, which has the following beneficial effects:

[0015] 1. The electric heating blower drying oven designed in this way can effectively divide the flowing hot air equally by setting C-shaped baffles with equal spacing inside the cavity between the protective shell and the drying chamber. This allows the air to be connected to the rectangular exhaust holes on both sides, ensuring that the amount and temperature of the gas flowing on both sides of the drying chamber are similar, thus avoiding the difference in drying degree between items of different heights inside the drying chamber.

[0016] 2. The electric heating forced-air drying oven designed in this way can filter the incoming air while replenishing the gas inside the drying oven, preventing dust from entering the oven. In addition, in environments with high humidity, the drying mesh box can dry the air, thereby reducing the humidity inside the drying oven and accelerating the drying efficiency.

[0017] 3. The electric heating blower drying oven designed in this way has a rotatable adjustable circular plate inside the exhaust pipe. By using the mutual staggered control of the overlapping area of ​​the fan-shaped exhaust grooves, the exhaust air volume can be controlled. The operation is simple and the results are stable.

[0018] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of an electrically heated drying oven with controllable airflow proposed in this utility model.

[0020] Figure 2 This is a side view of the overall unfolded structure of an electric heating drying oven with controllable airflow proposed in this utility model.

[0021] Figure 3 This is a first-view structural schematic diagram of an electrically heated drying oven with controllable airflow proposed in this utility model.

[0022] Figure 4 This is a schematic diagram of the internal structure of the protective shell of an electric heating drying oven with controllable airflow proposed in this utility model.

[0023] Figure 5 This is a top view of the disassembled protective shell structure of an electrically heated drying oven with controllable airflow proposed in this utility model.

[0024] In the diagram: 1. Outer casing; 2. Protective casing; 3. Drying chamber; 4. Air inlet duct; 5. Fan blade; 6. Shaded-pole asynchronous motor; 7. Rectangular exhaust vent; 8. C-shaped baffle; 9. C-shaped guide rail; 10. T-shaped insert plate; 11. Storage rod; 12. Air inlet pipe; 13. Air inlet hood; 14. Booster fan; 15. Drying mesh box; 16. Filter screen; 17. Exhaust pipe; 18. Circular baffle; 19. First fan-shaped exhaust duct; 20. Rotating shaft; 21. Adjusting circular plate; 22. Second fan-shaped exhaust duct; 23. Sealing cover; 24. PLC controller; 25. Control switch; 26. Door; 27. Push-button handle; 28. Observation window; 29. ​​Electric heating rod. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] Example 1:

[0027] An electrically heated drying oven with controllable airflow, as described in this embodiment... Figure 1-5 As shown, the device includes a housing 1, inside which a protective housing 2 is fixedly installed. A drying chamber 3 is welded to the inner wall of the protective housing 2. A cavity is provided between the drying chamber 3 and the protective housing 2. An air inlet slot 4 is formed in the middle of the inner wall of the drying chamber 3. A fan blade 5 is rotatably mounted inside the cavity on one side of the air inlet slot 4. The fan blade 5 is connected to a shaded-pole asynchronous motor 6 via a rotating shaft. Electric heating rods 29 arranged in a triangular pattern are installed on the side of the fan blade 5. Rectangular exhaust vents are equally spaced through the inner walls on both sides of the drying chamber 3. Hole 7, and C-shaped baffles 8 with equal spacing are welded to the outer walls of both sides of the drying chamber 3. The bottom inner wall of the protective shell 2 is connected to an air inlet pipe 12, and an air inlet cover 13 is welded to the end of the air inlet pipe 12. An exhaust pipe 17 is welded to the inner wall of the top of the drying chamber 3, and a circular baffle 18 is welded to the inner wall of the middle part of the exhaust pipe 17. A first fan-shaped exhaust groove 19 is opened through the outer wall of the circular baffle 18, and a sealing cover 23 is screwed to the outer wall of the top of the exhaust pipe 17. A PLC controller 24 is installed on one outer wall of the outer shell 1.

[0028] By setting equally spaced C-shaped baffles 8 inside the cavity between the protective shell 2 and the drying chamber 3, the flowing hot air can be effectively divided and processed equally, and then connected to the rectangular exhaust holes 7 on both sides. This ensures that the amount and temperature of the gas flowing on both sides of the drying chamber 3 are similar, thereby avoiding the difference in the degree of drying of items at different heights inside the drying chamber.

[0029] The inner wall of the drying chamber 3 is welded with two sets of parallel C-shaped guide rails 9, and T-shaped insert plates 10 are slidably inserted into the inner wall of the C-shaped guide rails 9. Placement rods 11 are welded between the two T-shaped insert plates 10 at equal intervals. A booster fan 14 is fixed inside the air inlet hood 13 by screws, and a drying mesh box 15 is provided on one side of the booster fan 14. A filter screen 16 is glued to the outer wall of the end of the air inlet hood 13.

[0030] The drying mesh box 15 has a cuboid mesh structure, and the outer wall size of the drying mesh box 15 is adapted to the inner wall size of the air inlet hood 13. The inner wall of the drying mesh box 15 is filled with activated carbon.

[0031] The circular partition 18 has a rotating shaft 20 rotatably mounted at its top axis, and an adjusting circular plate 21 is welded to the outer wall of the rotating shaft 20. The outer wall of the adjusting circular plate 21 has a second fan-shaped exhaust groove 22 that is evenly distributed.

[0032] While replenishing the gas inside the drying chamber, the filter screen 16 can filter the incoming air to prevent dust from entering the chamber. In addition, in environments with high humidity, the drying screen box 15 can dry the air, thereby reducing the humidity inside the drying chamber and accelerating the drying efficiency.

[0033] In this embodiment, the drying mesh box 15 containing activated carbon is first installed inside the air inlet hood 13, and the placement rod 11 is slidably inserted into the C-shaped guide rail 9. Then, the drying box is connected to an external power source, the items to be dried are placed on top of the placement rod 11, and the box door 26 is closed. Next, the PLC controller 24 is used to start the shaded-pole asynchronous motor 6, driving the fan blades 5 to rotate, and the electric heating rod 29 is activated, thereby heating the air inside the cavity. The rotating fan blades 5 accelerate the gas flow inside the cavity. Because the C-shaped guide baffles 8 are provided on both sides at equal intervals, the hot air can be evenly distributed, and the hot air flows along... The C-shaped baffle 8 flows into the rectangular exhaust holes 7 on both sides of the drying chamber 3 and is discharged. Due to the uniform distribution of heat and air volume, the items in the drying chamber 3 can be dried quickly and evenly. When the air humidity inside the drying chamber 3 increases, the adjusting disc 21 at the top of the exhaust pipe 17 is rotated to make the first fan-shaped exhaust groove 19 and the second fan-shaped exhaust groove 22 staggered, so as to discharge hot and humid air and reduce the internal humidity. The maximum exhaust volume is achieved when the first fan-shaped exhaust groove 19 and the second fan-shaped exhaust groove 22 overlap. When gas needs to be replenished, the booster fan 14 is activated to filter and dry the external air and introduce it into the cavity.

[0034] Example 2:

[0035] An electrically heated drying oven with controllable airflow, such as Figure 1-4 As shown, this embodiment makes the following additions based on embodiment 1: the size of the circular partition 18 is the same as the size of the adjusting circular plate 21, and the bottom outer wall of the adjusting circular plate 21 is in close contact with the top outer wall of the circular partition 18; the size of the first fan-shaped exhaust groove 19 is the same as the size of the second fan-shaped exhaust groove 22, and the central angle of the first fan-shaped exhaust groove 19 and the second fan-shaped exhaust groove 22 is 50°; the PLC controller 24 is connected to the shaded-pole asynchronous motor 6, the booster fan 14 and the electric heating rod 29 through signal lines; and the PLC controller 24 is connected to the control switch 25 through wires; the control switch 25 is connected to an external power supply through wires.

[0036] A door 26 is hinged to one side of the outer shell 1 of the box, and a push-type handle 27 is provided on one side of the door 26. An observation window 28 is provided in the middle of the door 26, and double-layer tempered glass is adhered to the inner wall of the observation window 28.

[0037] In this embodiment, a rotatable adjusting disc 21 is installed inside the exhaust pipe 17. By controlling the overlapping area of ​​the fan-shaped exhaust slots through mutual misalignment, the exhaust air volume can be controlled. The operation is simple and the results are stable.

[0038] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A controlled air volume electrically heated forced air drying oven comprising an oven housing (1), characterised in that, A protective shell (2) is fixedly installed inside the outer shell (1) of the box, and a drying chamber (3) is welded to the inner wall of the protective shell (2). A cavity is provided between the drying chamber (3) and the protective shell (2), and an air inlet groove (4) is opened in the middle inner wall of the drying chamber (3). A fan blade (5) is rotatably installed on one side of the air inlet groove (4) inside the cavity, and the fan blade (5) is connected to a shaded-pole asynchronous motor (6) through a rotating shaft. Electric heating rods (29) are installed on the side of the fan blade (5) in a triangular arrangement. Rectangular exhaust holes (7) are equidistantly distributed through the inner walls on both sides of the drying chamber (3), and the drying chamber... The outer walls of the two sides of the chamber (3) are welded with C-shaped baffles (8) distributed at equal intervals. The bottom inner wall of the protective shell (2) is connected to an air inlet pipe (12), and the end of the air inlet pipe (12) is welded with an air inlet cover (13). The top inner wall of the drying chamber (3) is welded with an exhaust pipe (17), and the middle inner wall of the exhaust pipe (17) is welded with a circular baffle (18). The outer wall of the circular baffle (18) is through-cut with a first fan-shaped exhaust groove (19), and the top outer wall of the exhaust pipe (17) is screwed with a sealing cover (23). A PLC controller (24) is installed on one side of the outer wall of the box shell (1).

2. The electrically heated forced air drying oven of claim 1, wherein, The inner wall of the drying chamber (3) is welded with two sets of parallel C-shaped guide rails (9), and T-shaped inserts (10) are slidably inserted into the inner wall of the C-shaped guide rails (9). Placement rods (11) are welded between the two T-shaped inserts (10) at equal intervals.

3. The electrically heated forced air drying oven of claim 1, wherein, The air inlet hood (13) is fitted with a booster fan (14) inside by screws, and a drying mesh box (15) is provided on one side of the booster fan (14). A filter screen (16) is glued to the outer wall of the end of the air inlet hood (13).

4. The electrically heated forced air drying oven of claim 3, wherein, The drying mesh box (15) has a rectangular mesh structure, and the outer wall size of the drying mesh box (15) is adapted to the inner wall size of the air inlet hood (13). The inner wall of the drying mesh box (15) is filled with activated carbon.

5. The electrically heated forced air drying oven of claim 1 wherein, The circular partition (18) has a rotating shaft (20) rotatably mounted at its top axis, and an adjusting circular plate (21) is welded to the outer wall of the rotating shaft (20). The outer wall of the adjusting circular plate (21) has a second fan-shaped exhaust groove (22) that is evenly distributed.

6. The electrically heated forced air drying oven of claim 5, wherein, The size of the circular partition (18) is the same as that of the adjusting circular plate (21), and the bottom outer wall of the adjusting circular plate (21) is in close contact with the top outer wall of the circular partition (18). The size of the first fan-shaped exhaust groove (19) is the same as that of the second fan-shaped exhaust groove (22), and the central angle of the first fan-shaped exhaust groove (19) and the second fan-shaped exhaust groove (22) is 50°.

7. The electrically heated drying oven with controllable airflow according to claim 3, characterized in that, The PLC controller (24) is connected to a shaded-pole asynchronous motor (6), a booster fan (14), and an electric heating rod (29) via signal lines. The PLC controller (24) is also connected to a control switch (25) via wires, and the control switch (25) is connected to an external power source via wires.

8. The electrically heated drying oven with controllable airflow according to claim 1, characterized in that, The outer shell (1) of the box is hinged to a door (26) on one side, and a push-type handle (27) is provided on one side of the door (26). An observation window (28) is provided in the middle of the door (26), and double-layer tempered glass is bonded to the inner wall of the observation window (28).

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