Preheating device and drying equipment applying same

Abstract

The utility model relates to the technical field of drying equipment, in particular to a preheating device and drying equipment applying the preheating device.The preheating device comprises a heating cylinder used for being connected with a drying box, a heating assembly is arranged in the heating cylinder, and a gas inlet used for inputting gas and a gas outlet used for outputting preheated gas are formed in the heating cylinder; and the air inlet and the air outlet are arranged on the heating cylinder in a staggered manner. According to the drying device, external nitrogen enters the heating cylinder through the gas inlet, is preheated by the heating assembly and then enters the drying box through the gas outlet, the temperature difference between the preheated nitrogen and original gas in the drying box is small, and therefore compared with the traditional condition that normal-temperature nitrogen is directly injected into the drying box and then heated, the temperature difference between the nitrogen and the original gas is small; and the temperature uniformity of gas in the drying box is better, so that the product drying effect is better, and the drying quality is improved.

Description

Technical Field

[0001] The present application relates to the technical field of drying equipment, and in particular to a preheating device and drying equipment using the preheating device. Background Art

[0002] In industry, various workpieces often need to be heated. For example, during the heat treatment of metal workpieces, the workpieces must be heated to a relatively high temperature. However, most workpieces will oxidize after reaching high temperatures, and their surfaces will form oxide scales that fall off, which will have a significant impact on the surface quality and dimensions of the workpieces. Currently, the problem of workpiece oxidation caused by heating can be solved by coating the workpiece surface and heating in an inert atmosphere, such as using a nitrogen oven to heat and dry with nitrogen.

[0003] Existing nitrogen ovens generally inject external nitrogen directly into the oven or first inject it into the air circulation duct, and then mix it with the hot air in the duct before entering the oven. The disadvantage is that the temperature of external nitrogen is generally relatively low. When nitrogen enters the oven, it has a significant impact on the uniformity of the air temperature inside the oven. Even if nitrogen is first injected into the air circulation duct and then mixed with the hot air in the duct before entering the oven, it will still have a significant impact on the temperature inside the oven, resulting in poor product drying effect. Therefore, further improvement can be made. Utility Model Content

[0004] In order to increase the drying effect of the product and improve the drying quality, the present application provides a preheating device and a drying device using the preheating device.

[0005] In the first aspect, a preheating device provided in the present application adopts the following technical solution: a preheating device, comprising a heating cylinder for connecting to a drying box, a heating assembly being provided in the heating cylinder, an air inlet for inputting gas and an air outlet for outputting preheated gas being provided on the heating cylinder, and the air inlet and the air outlet being staggered with each other on the heating cylinder.

[0006] By adopting the above technical solution, external nitrogen enters the heating cylinder through the air inlet, is preheated by the heating component, and then enters the drying box from the air outlet. The temperature of the preheated nitrogen is not much different from the original gas in the drying box. Therefore, compared with the traditional method of directly injecting room temperature nitrogen into the drying box and then heating it, the gas temperature in the drying box is more uniform, which makes the drying effect of the product better, thereby improving the drying quality.

[0007] Optionally, a quick connector is provided on the air inlet, a heat-insulating layer is provided on the heating cylinder, and the quick connector is passed through the heat-insulating layer.

[0008] By adopting the above technical solution, a thermal insulation layer is provided, which is utilized to reduce the heat dissipation outward from the heating tube, reduce heat loss, thereby improving the utilization rate of thermal energy and achieving energy-saving effects.

[0009] Optionally, an air outlet pipe is provided on the air outlet, and a heat-insulating sleeve is provided on the air outlet pipe.

[0010] By adopting the above technical solution, a heat-insulating sleeve is provided, and the heat-insulating sleeve is utilized to reduce heat loss during nitrogen transfer in the outlet pipe, thereby improving thermal energy utilization and achieving energy-saving effects.

[0011] Optionally, the heating component is an electric heating tube, and the heating component includes a horizontal portion and a bending portion. There are two groups of horizontal portions, and the two groups of horizontal portions are arranged in parallel with each other, and the two ends of the bending portion are respectively connected to one group of horizontal portions to form a U shape.

[0012] By adopting the above technical solution, the U-shaped heating component allows the nitrogen to contact the heating component more evenly in the heating tube, and can increase the heating area of ​​the heating component in a smaller space, thereby better heating the nitrogen.

[0013] Optionally, the heating tube is provided with an induction switch for controlling the operation of the heating tube and a temperature measuring hole for measuring the temperature inside the heating tube, and the induction switch and the temperature measuring hole are both located at the end of the heating tube away from the air outlet.

[0014] By adopting the above technical solution, an induction switch and a temperature measuring hole are set, and the induction switch and the temperature measuring hole are used in conjunction, the induction switch controls the start of the heating cylinder and adjusts the flow rate of nitrogen, and the temperature measuring hole is used to monitor the temperature of the nitrogen in the heating cylinder, so that the temperature of the nitrogen in the heating cylinder is close to the temperature of the air in the drying box, thereby ensuring the temperature uniformity and stability of the gas subsequently injected into the drying box. Optionally, in a second aspect, a drying device provided by the present application adopts the following technical solution: a drying device, the drying box includes an outer shell, a distribution box is provided on one side of the outer shell, a circuit assembly is provided in the distribution box, a seamlessly welded drying space is provided in the outer shell, a circulating air duct is provided in the drying space through a partition plate, and the circulating air duct is connected to the outlet pipe.

[0015] By adopting the above technical solution, the staff places the products to be dried in the drying space, then starts the drying box. The heating cylinder connected to the drying box cooperates with the air outlet and the air outlet pipe to inject preheated nitrogen into the circulating air duct. The circulating air duct circulates the nitrogen in the drying space to ensure that the hot air is evenly distributed, thereby improving the drying efficiency and uniformity of the products in the drying space.

[0016] Optionally, an air blower and a heating pipe are provided in the circulating air duct, and the heating pipe is arranged on the air blower in a surrounding manner.

[0017] By adopting the above technical solution, the blower cooperates with the heating pipe to form circulating hot air in the drying space, ensuring uniform temperature in the drying space, improving the transfer efficiency of heat energy, reducing heat loss, and achieving rapid and uniform heating.

[0018] Optionally, there are two groups of outer shells, the two groups of outer shells are stacked on each other, the two groups of outer shells share a group of distribution boxes, a heating cylinder is provided outside each outer shell, and a movable component is provided on the outer shell located at the bottom.

[0019] By adopting the above technical solution, two groups of outer shells for drying are set up. The two groups of stacked outer shells can save ground space, and the drying spaces in the two groups of outer shells work at the same time, which can dry more products at the same time and improve the drying efficiency of the total amount of products.

[0020] Optionally, the moving assembly includes a support frame, and a plurality of lockable and fixed moving parts are provided at the bottom of the support frame.

[0021] By adopting the above technical solution, a moving component is set up, and the moving parts set at the bottom of the support frame are used to drive the drying box to move, so that the drying box has flexibility and can be moved to a suitable position for use according to the user's placement requirements, thereby increasing the adaptability of the drying box.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. External nitrogen enters the heating cylinder through the air inlet, is preheated by the heating component, and then enters the drying box from the air outlet. The temperature of the preheated nitrogen is not much different from the original gas in the drying box. Therefore, compared with the traditional method of directly injecting room temperature nitrogen into the drying box and then heating it, the gas temperature in the drying box is more uniform, which makes the drying effect of the product better, thereby improving the drying quality;

[0024] 2. The U-shaped heating element allows the nitrogen to contact the heating element more evenly in the heating tube, which can increase the heating area of ​​the heating element in a smaller space, thereby better heating the nitrogen;

[0025] 3. Set up an induction switch and a temperature measuring hole. Use the induction switch and the temperature measuring hole together. The induction switch controls the start of the heating cylinder and adjusts the flow of nitrogen. Use the temperature measuring hole to monitor the nitrogen temperature in the heating cylinder, so that the nitrogen temperature in the heating cylinder is close to the temperature of the air in the drying box, thereby ensuring the temperature uniformity and stability of the gas subsequently injected into the drying box. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of the embodiment of the present application

[0027] Figure 2 It is a schematic diagram of the structure of the heating cylinder in the embodiment of the present application.

[0028] Figure 3 It is a schematic cross-sectional view of the structure of the heating tube in the embodiment of the present application.

[0029] Figure 4 It is a partial cross-sectional schematic diagram of a drying box in an embodiment of the present application.

[0030] Figure 5 It is a schematic diagram of the structure of the mobile component part in the embodiment of the present application.

[0031] Description of reference numerals:

[0032] 1. Heating tube; 11. Insulation layer; 12. Induction switch; 13. Temperature measuring hole; 2. Fixed bracket; 21. Fixed plate; 3. Quick connector; 4. Exhaust pipe; 41. Insulation sleeve; 5. Heating component; 51. Horizontal part; 52. Bending part; 6. Drying box; 61. Outer shell; 62. Distribution box; 63. Preheating mesh cover; 64. Drying space; 65. Partition plate; 66. Circulating air duct; 67. Blower; 68. Heating tube; 7. Moving component; 71. Support frame; 72. Moving part; 721. Connecting plate; 722. First support block; 723. Fixed block; 724. Support; 725. First moving sleeve; 726. Second support block; 727. Rotating rod; 728. Rotating handle; 729. Wheel. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-5 This application is described in further detail.

[0034] The embodiments of the present application disclose a preheating device and drying equipment using the preheating device.

[0035] Reference Figure 1-3 A preheating device and a drying device using the preheating device include a cylindrical heating cylinder 1 for connecting to a drying box 6. The heating cylinder 1 is horizontally arranged on one side of the drying box 6. A fixing bracket 2 is provided on the heating cylinder 1. The fixing bracket 2 includes two sets of L-shaped fixing plates 21. The two fixing plates 21 are respectively vertically arranged at both ends of the heating cylinder 1 and then fixed to one side of the drying box 6 by bolts.

[0036] A heating assembly 5 is provided inside the drying box 6, and an air inlet and an air outlet are provided on the heating cylinder 1, wherein the air inlet is located on one side of the bottom of the heating cylinder 1 along its horizontal axial direction, and the air outlet is located on one side of the top of the heating cylinder 1 along its horizontal axial direction, so that the air outlet and the air inlet are arranged in a staggered manner. A quick connector 3 is provided at the air inlet position, and an air outlet pipe 4 is provided at the air outlet position. One end of the air outlet pipe 4 is connected to the heating cylinder 1, and the other end is connected to the drying box 6;

[0037] In order to increase the thermal energy utilization rate of the heating tube 1, an insulation layer 11 is provided on the heating tube 1, and the quick connector 3 is penetrated by the insulation layer 11, and an insulation sleeve 41 is provided on the air outlet pipe 4. The insulation layer 11 and the insulation sleeve 41 are used to reduce the outward heat dissipation of the heating tube 1 and reduce heat loss, thereby improving the thermal energy utilization rate and achieving energy saving effect.

[0038] In addition, the heating tube 1 is also provided with an induction switch 12 and a temperature measuring hole 13. The induction switch 12 and the temperature measuring hole 13 are both arranged at one end of the heating tube 1 close to the outlet pipe 4. The induction switch 12 cooperates with the temperature measuring hole 13, and the induction switch 12 controls the start-up of the heating tube 1 and adjusts the flow rate of nitrogen. The temperature measuring hole 13 is used to monitor the temperature of the nitrogen in the heating tube 1, so that the temperature of the nitrogen in the heating tube 1 is close to the temperature of the air in the drying box 6, thereby ensuring the temperature uniformity and stability of the gas subsequently injected into the drying box 6.

[0039] During actual use, external nitrogen enters the heating cylinder 1 from the air inlet through the quick connector 3, is preheated by the heating component 5, and then enters the drying box 6 through the air outlet and the air outlet pipe 4. The temperature of the preheated nitrogen is not much different from the original gas in the drying box 6. Therefore, compared with the traditional method of directly injecting room temperature nitrogen into the drying box 6 and then heating it, the gas temperature in the drying box 6 is more uniform, which makes the drying effect of the product better, thereby improving the drying quality.

[0040] refer to Figure 3 Specifically, in this embodiment, the heating component 5 is an electric heating tube, and the heating component 5 includes a horizontal portion 51 in a horizontal state and a bent portion 52 in a curved state. There are two groups of horizontal portions 51, and the two groups of horizontal portions 51 are arranged in parallel with each other. The heating tube 1 and the fixing plate 21 are passed through the ends of the two groups of horizontal portions 51 close to the air outlet pipe 4. The ends of the two groups of horizontal portions 51 away from the air outlet pipe 4 are respectively connected to the two ends of the bent portion 52, and a U-shape is formed between the bent portion 52 and the two groups of horizontal portions 51.

[0041] During actual use, the staff places the products to be dried into the drying space 64, then starts the drying box 6, and the heating cylinder 1 connected to the drying box 6 cooperates with the outlet pipe 4 to inject preheated nitrogen into the circulating air duct 66 through the air outlet. The circulating air duct 66 circulates the nitrogen in the drying space 64 to ensure that the hot air is evenly distributed, thereby improving the drying efficiency and uniformity of the products in the drying space 64.

[0042] The present application also discloses a drying device for use with the preheating device. Figure 1 、 4 Specifically, in this embodiment: the drying box 6 includes two groups of outer shells 61 stacked on each other in the height direction, a distribution box 62 is provided on one side of the two groups of outer shells 61, and the two groups of outer shells 61 share one group of distribution boxes 62, and a circuit assembly is provided in the distribution box 62, and a heating cylinder 1 is provided outside each group of outer shells 61, and the heating cylinder 1 is protected by a preheating mesh cover 63, and a drying space 64 is provided in each group of outer shells 61 by seamless welding, and a partition plate 65 is provided on one side of the drying space 64 near the heating cylinder 1, and a circulating air duct 66 is set up by the partition plate 65, and the circulating air duct 66 is provided with a blower 67 and a heating pipe 68. The heating pipe 68 is arranged in a circumferential manner with the blower 67 as the center of the circle. The blower 67 cooperates with the heating pipe 68 to form circulating hot air in the drying space 64, thereby ensuring uniform temperature in the drying space 64, improving the transfer efficiency of heat energy, reducing heat loss, and achieving rapid and uniform heating. In this embodiment, the blower 67 is a conventional technical means, so the specific structure will not be explained here.

[0043] During actual use, the staff places the products to be dried into the drying space 64, then starts the drying box 6, and the heating cylinder 1 connected to the drying box 6 cooperates with the outlet pipe 4 to inject preheated nitrogen into the circulating air duct 66 through the air outlet. The circulating air duct 66 circulates the nitrogen in the drying space 64 to ensure that the hot air is evenly distributed, thereby improving the drying efficiency and uniformity of the products in the drying space 64.

[0044] refer to Figure 1 、 5Specifically, in this embodiment, a moving assembly 7 is provided at the bottom of the outer shell 61 at the bottom. The moving assembly 7 includes a mouth-shaped support frame 71. The top of the support frame 71 is fixedly connected to the bottom of the outer shell 61 by bolts. The four corners of the bottom of the support frame 71 are respectively provided with moving parts 72. The moving parts 72 include a connecting plate 721. The top of the connecting plate 721 is fixedly connected to the bottom of the support frame 71. A first supporting block 722 is provided at the bottom of the connecting plate 721. The circumferential side of the first supporting block 722 is respectively provided with a fixed block 723 and a support 724. The fixed block 723 and the support 724 are arranged opposite to each other. The other end of the fixed block 723 is provided with a first moving sleeve 725. The second supporting block is slidably provided in the first moving sleeve 725 726, a sliding block is provided on the inner circumference of the first movable sleeve 725 along its height direction, and a sliding groove is provided on the outer circumference of the second support block 726 along its height direction. The sliding block can be slidably set in the sliding groove. A threaded hole is provided at the bottom of the first support block 722, and a rotating rod 727 is provided on the top of the second support block 726. A rotating handle 728 is provided on the rotating rod 727. The top of the rotating rod 727 is inserted into the threaded hole at the bottom of the first support block 722, and the bottom of the rotating rod 727 is fixedly provided on the top of the second support block 726, so that the second support block 726 can drive the rotating rod 727 to move telescopically by rotating the rotating handle 728, thereby making the second support block 726 telescopically move up and down in the first movable sleeve 725;

[0045] A wheel 729 is provided in the support 724, the top of the support 724 is connected to the first support block 722, the bottom of the support is fixedly connected to the first movable sleeve 725 near the side of the first movable sleeve 725, and an avoidance opening is provided on the second support block 726. The wheel 729 can pass through the avoidance opening and be arranged in the second support block 726. The length of the rotating rod 727 is longer than the sum of the heights of the wheel 729 and the support 724.

[0046] In actual use, the drying box 6 is moved by the movable member 72 provided at the bottom of the support frame 71, making the drying box 6 flexible and allowing it to be moved to a suitable location according to the user's placement requirements, thereby increasing the adaptability of the drying box 6. When moved to a suitable location, the rotating handle 728 is rotated to drive the rotating rod 727, which drives the second support block 726 downward from the first movable sleeve 725 until the bottom of the second support block 726 contacts the ground, acting as a foot cup.

[0047] The implementation principle of a preheating device and a drying device using the preheating device in an embodiment of the present application is as follows: external nitrogen enters the heating cylinder 1 from the air inlet through the quick connector 3, is preheated by the heating component 5, and then enters the drying box 6 from the air outlet pipe 4 through the air outlet. The temperature of the preheated nitrogen is not much different from the original gas in the drying box 6. Therefore, compared with the traditional method of directly injecting room temperature nitrogen into the drying box 6 and then heating it, the gas temperature in the drying box 6 is more uniform, which makes the drying effect of the product better, thereby improving the drying quality.

[0048] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A preheating device, characterized in that: The invention comprises a heating cylinder (1) for connecting to a drying box (6), a heating assembly (5) being arranged in the heating cylinder (1), an air inlet for inputting gas and an air outlet for outputting preheated gas being arranged on the heating cylinder (1), the air inlet and the air outlet being arranged on the heating cylinder (1) in an interlaced manner, wherein the heating assembly (5) is an electric heating tube, the heating assembly (5) comprising a horizontal portion (51) and a bending portion (52), the horizontal portion (51) having two groups, the two groups of horizontal portions (51) being arranged in parallel with each other, and the two ends of the bending portion (52) being respectively connected to one group of horizontal portions (51) to form a U-shape.

2. A preheating device according to claim 1, characterized in that: A quick connector (3) is provided on the air inlet, a heat-insulating layer (11) is provided on the heating cylinder (1), and the quick connector (3) is passed through the heat-insulating layer (11).

3. A preheating device according to claim 1, characterized in that: An air outlet pipe (4) is provided on the air outlet, and a heat-insulating sleeve (41) is sleeved on the air outlet pipe (4).

4. A preheating device according to claim 1, characterized in that: The heating tube (1) is provided with an induction switch (12) for controlling the operation of the heating tube (1) and a temperature measuring hole (13) for measuring the temperature inside the heating tube (1). The induction switch (12) and the temperature measuring hole (13) are both located at an end of the heating tube (1) away from the air outlet.

5. A drying device, characterized in that: The invention comprises a drying box (6) and a preheating device according to any one of claims 1 to 4, wherein the drying box (6) comprises an outer shell (61), a distribution box (62) is provided on one side of the outer shell (61), a circuit assembly is provided in the distribution box (62), a seamlessly welded drying space (64) is provided in the outer shell (61), a circulating air duct (66) is provided in the drying space (64) through a partition plate (65), and the circulating air duct (66) is connected to the air outlet pipe (4).

6. A drying device according to claim 5, characterized in that: A blower (67) and a heating pipe (68) are provided in the circulating air duct (66), and the heating pipe (68) is arranged on the blower (67) in a surrounding manner.

7. The drying device according to claim 5, characterized in that: There are two groups of outer shells (61), which are stacked on each other and share a distribution box (62). A heating cylinder (1) is provided outside each outer shell (61), and a moving component (7) is provided on the outer shell (61) at the bottom.

8. The drying device according to claim 7, characterized in that: The moving assembly (7) comprises a support frame (71), and a plurality of lockable and fixed moving parts (72) are provided at the bottom of the support frame (71).

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