High-temperature-resistant thermal circulation fan

Abstract

A motor is connected with a main shaft, the main shaft penetrates through a heat insulation box body, the lower end of the main shaft is sleeved with an impeller, a cavity for heat dissipation is formed in the upper middle portion of the heat insulation box body, a heat insulation box is arranged on the lower portion of the heat insulation box body, and an airflow base is arranged at the bottom of the cavity of the heat insulation box body and surrounds the main shaft. The bottom of the airflow base is tightly fixed to the top of the heat insulation box, a nitrogen pipe is led into the airflow base, and when the main shaft rotates, pressurized nitrogen can overflow out of the elastic sealing ring at the lower end of the airflow base and enter the high-temperature furnace through the gap. The main shaft is sleeved with the fan, air is driven to flow, the bearing is cooled, and the bearing does not need a water cooling structure; the airflow seat is filled with nitrogen to form a high-pressure air cavity, when air pressure in the air cavity reaches a certain degree, nitrogen flow more tends to overflow from the elastic sealing ring at the lower end and flows into the high-temperature furnace along a gap between the main shaft and the heat insulation box, and therefore hot air in the high-temperature furnace is prevented from flowing into the heat insulation box.

Description

TECHNICAL FIELD

[0001] The utility model relates to hot air circulating fan technical field, concretely relates to high temperature resistant heat circulating fan. BACKGROUND

[0002] The hot air circulating fan is mainly used for causing air convection in the high temperature furnace and makes hot air balanced, in order to guarantee air flow effect, the impeller of the fan needs to be inserted into the high temperature furnace to a certain depth, and the motor and other power components are exposed outside the high temperature furnace, in order to guarantee the operation of the fan, the fan spindle and bearing need to be heat insulated, specifically, the part inserted into the high temperature furnace is heat insulated and covered along the axial direction except the impeller, a relatively thick heat insulation layer is arranged at the spindle close to the impeller when the impeller rotates at high speed with the spindle, due to high-speed rotation of the spindle, a certain gap is reserved between the heat insulation layer and the spindle, and hot air in the high temperature furnace is easy to enter the inside of the fan from the gap between the distal end of the spindle and the heat insulation layer, thereby affecting the heat insulation effect, the bearing and the spindle are easy to be deformed and damaged under high temperature, thereby affecting the service life of the fan. SUMMARY

[0003] The utility model wants to solve the technical problem that a kind of high temperature resistant heat circulating fan is provided, solve the hot air flow in the high temperature furnace and be easy to enter the inside of the fan from the outer circumference of the spindle, affect the heat insulation effect, the bearing and the spindle are easy to be deformed and damaged under high temperature, thereby affecting the service life of the fan.

[0004] To solve the above technical problem, the technical scheme adopted by the utility model is:

[0005] The application discloses a high-temperature resistant heat cycle fan, which comprises a heat insulation box body, a motor is arranged on the top of the heat insulation box body, the bottom output end of the motor is connected with the upper end of a main shaft in a transmission mode, the main shaft penetrates through the heat insulation box body and extends out from the lower end, an impeller is arranged on the lower end of the main shaft, the middle upper part of the heat insulation box body is internally provided with a cavity for heat dissipation, the side wall of the cavity is provided with a heat insulation interlayer, the lower part of the heat insulation box body is a heat insulation box, the heat insulation interlayer and the heat insulation box are internally provided with a filling material for heat insulation, a gas flow seat is arranged on the outer circumference of the main shaft and surrounds the main shaft at the bottom of the middle upper part cavity of the heat insulation box body, the bottom of the gas flow seat is fixed on the top of the heat insulation box, a gas cavity is arranged in the middle of the inner part of the gas flow seat and surrounds the main shaft, a nitrogen gas pipe is arranged on the top of the heat insulation box body and penetrates into the gas cavity, recesses are arranged on the inner sides of the upper end and the lower end of the gas flow seat and surround the main shaft, two rows of elastic sealing rings are arranged in the recess of the upper end of the gas flow seat, one row of elastic sealing rings is arranged in the recess of the lower end of the gas flow seat, lubricating oil is coated on the contact position between the inner circumference of each elastic sealing ring and the outer circumference of the main shaft, a gap is reserved between the inner center of the heat insulation box and the main shaft, and when the main shaft rotates, the pressurized nitrogen gas can overflow from the elastic sealing ring of the lower end of the gas flow seat, enter into the high-temperature furnace through the gap and realize heat insulation.

[0006] As a preferred embodiment, the top of the heat insulation box body is provided with a cover plate, the motor is fixed on the cover plate through a motor support frame, the output end of the motor is connected with the main shaft through a flexible coupling, and a flange edge for installation is radially extended on the top of the heat insulation box body.

[0007] As a preferred embodiment, the upper part of the main shaft is sleeved with two separated bearings, the two bearings are mounted on a bearing seat, the bearing seat is fixed on the cover plate and a partition plate respectively and close to the two ends, the four peripheral edges of the partition plate are fixed on the inner side wall of the cavity of the heat insulation box body, the partition plate divides the heat insulation box body into an air outlet cavity and a cold air cavity from top to bottom, a fan is sleeved on the main shaft and arranged in the cold air cavity, an air pipe is arranged outside the cover plate and extends into the cold air cavity, a plurality of air outlet holes are formed in the cover plate and close to the four peripheral edges, a plurality of air outlet holes are formed in the partition plate and close to the bearing seat, and air enters into the cold air cavity from the air pipe and flows out through the air outlet cavity when the fan rotates.

[0008] As a preferred embodiment, the gas flow seat is sealingly connected on the inner flat plate on the top of the heat insulation box through bolts, and a sealing block ring is arranged on the circumferential middle part of the one side of the gas flow seat close to the inner flat plate.

[0009] As a preferred embodiment, the impeller comprises a disc close to the side of the heat insulation box, a plurality of blades are circumferentially distributed on the end face of the side of the disc away from the heat insulation box, and a shaft sleeve for mounting on the main shaft is arranged in the center of the disc.

[0010] As a preferred embodiment, the filling material in the heat insulation interlayer and the heat insulation box is heat insulation cotton.

[0011] As a preferred embodiment, the bearing is also connected with an oil injection pipe, and the lubricating oil is added through an oil injection port extending out of the cover plate.

[0012] As a preferred embodiment, the elastic sealing ring is made of polytetrafluoroethylene, and a skeleton is wrapped inside the elastic sealing ring.

[0013] The utility model discloses the beneficial effect is: bearing pedestal extends to the high temperature stove, and the main shaft and bearing pedestal are covered with the heat insulation box body, and the upper and lower two bearings are all high temperature -resistant deep -groove ball bearings, and the oil injection port of bearing is located at the whole outside, and the oil lubrication is convenient for bearing, can better satisfy the use of bearing under high temperature condition, the heat insulation box body's inside upper portion is the chamber for radiating, and the chamber is divided into the air outlet cavity of upper side and the cold air cavity of lower side, and the air pipe is directly through to the cold air cavity, and the fan is set up on the main shaft in the cold air cavity, and when the fan rotates along with the main shaft, the air flow is driven, and the bearing is cooled, and the bearing does not need water cooling structure, and the air flow seat that blocks the hot gas in the high temperature stove is arranged at the bottom of the cold air cavity, and the nitrogen gas is filled in the air flow seat, and forms the high pressure gas chamber, and when the air pressure in the gas chamber reaches certain degree, the nitrogen flow more tends to overflow from the lower end elastic sealing ring, and flows into the high temperature stove along the gap between the main shaft and the heat insulation box, thereby preventing the hot gas in the high temperature stove from flowing into the heat insulation box body, and the nitrogen flow can not only protect the elastic sealing ring and the main shaft of polytetrafluoroethylene material, but also can reduce the conduction heat on the main shaft, guarantee the normal operation of bearing, thereby can prolong the service life of fan. BRIEF DESCRIPTION OF DRAWINGS

[0014] The specific embodiment of the utility model is further explained in detail below in combination with the drawings, wherein:

[0015] Figure 1 It is the structural schematic diagram of the utility model;

[0016] Figure 2 It is Figure 1 It is the local structure enlarged view of the air flow seat part;

[0017] Figures 1-2 The reference numerals in the drawings are as follows: 1, motor; 2, nitrogen pipe; 3, flexible coupling; 4, heat insulation box body; 5, bearing pedestal; 6, heat insulation interlayer; 7, air flow seat; 8, heat insulation box; 9, main shaft; 10, impeller; 11, fan; 12, partition; 13, bearing; 14, oil injection pipe; 15, oil injection port; 16, air pipe; 17, motor support frame; 18, flange edge; 19, cold air cavity; 20, cover plate; 21, air outlet cavity; 71, gas chamber; 72, elastic sealing ring; 73, sealing baffle; 81, inner flat plate; 82, gap; 101, wheel disc; 102, blade; 103, shaft sleeve. SPECIFIC EMBODIMENT

[0018] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0019] This utility model describes a high-temperature resistant heat circulation fan. (See also...) Figures 1-2 As shown, the device includes an insulated housing 4. A motor 1 is mounted on the top of the insulated housing 4. The bottom output end of the motor 1 is connected to the upper end of a main shaft 9. The main shaft 9 passes through the insulated housing 4 and extends outwards at its lower end. An impeller 10 is fitted onto the lower end of the main shaft 9. The upper middle part of the insulated housing 4 contains a heat dissipation chamber, and the side walls of this chamber are configured as an insulated interlayer 6. The lower part of the insulated housing 4 is an insulation box 8. The insulated interlayer 6 and the insulation box 8 contain insulation filler. An airflow seat 7 is arranged around the outer circumference of the main shaft 9 at the bottom of the upper middle chamber of the insulated housing 4. The bottom of the airflow seat 7 is tightly fixed to the top of the insulation box 8. The airflow seat 7 surrounds the main shaft 9. An air chamber 71 is provided in the middle of the interior. A nitrogen pipe 2 is provided from the top of the heat insulation box 4 downward into the air chamber 71. Grooves are provided around the main shaft 9 on the inner side of the upper and lower ends of the air flow seat 7. Two parallel elastic sealing rings 72 are provided in the upper groove of the air flow seat 7, and one elastic sealing ring 72 is provided in the lower groove of the air flow seat 7. Lubricating oil is applied to the contact point between the inner circumference of each elastic sealing ring 72 and the outer circumference of the main shaft 9. A gap 82 is left between the inner center of the heat insulation box 8 and the area around the main shaft 9. When the main shaft 9 rotates, the pressurized nitrogen can overflow from the elastic sealing ring 72 at the lower end of the air flow seat 7 and enter the high-temperature furnace through the gap 82.

[0020] Specifically, nitrogen gas is introduced into the internal air chamber 71 of the airflow seat 7, creating a high-pressure gas inside the air chamber 71. As nitrogen continues to be introduced, under normal operating conditions, when the main shaft 9 rotates, the high-pressure nitrogen gas overflows from the elastic sealing ring 72 due to its elasticity. The lower end of the airflow seat 7 has only one elastic sealing ring 72. Since the upper end of the airflow seat 7 has more elastic sealing rings 72 than the lower end, when the gas pressure inside the air chamber 71 reaches a certain level, the nitrogen gas flow tends to overflow from the lower elastic sealing ring 72 and flow into the high-temperature furnace along the gap 82. The airflow surrounds the main shaft 9, not only cooling the main shaft 9 but also preventing the airflow from the high-temperature furnace from entering the fan through the gap 82, thus protecting the main shaft and bearings, and other key components.

[0021] In this embodiment, a cover plate 20 is provided on the top of the heat insulation box 4. A motor 1 is fixed on the cover plate 20 by a motor support frame 17. The output end of the motor 1 is connected to a main shaft 9 through a flexible coupling 3. Flange edges 18 for installation extend radially around the top of the heat insulation box 4. The motor 1 and the main shaft 9 are coaxially connected by the flexible coupling 3, making the overall structure compact and easy to install.

[0022] In this embodiment, the upper part of the main shaft 9 is sleeved with two spaced bearings 13, the two bearings 13 are installed on the bearing seat 5, the two ends of the bearing seat 5 are fixed on the cover plate 20 and the partition plate 12 respectively, the four peripheral edges of the partition plate 12 are fixed on the inner side wall of the cavity of the heat insulation box 4, the partition plate 12 divides the upper cavity of the heat insulation box 4 into the air outlet cavity 21 and the cold air cavity 19 from top to bottom, the fan 11 is sleeved on the main shaft 9 in the cold air cavity 19, the air pipe 16 extends into the cold air cavity 19 from the outside of the cover plate 20, a plurality of air outlet holes are formed in the cover plate 20 close to the four peripheral edges, a plurality of air outlet holes are formed in the partition plate 12 close to the bearing seat 5, when the fan 11 rotates, the air enters the cold air cavity 19 from the air pipe 16, and flows out through the air outlet cavity 21. The air pipe 16 can be connected with air to achieve greater air flow rate and cool the bearing seat. When the fan 11 rotates, the air outside the high-temperature furnace enters the cold air cavity 19 from the air pipe 16, the air in the cold air cavity 19 enters the air outlet cavity 21 from the air outlet holes in the inner edge of the partition plate 12, and the air in the air outlet cavity 21 flows out from the air outlet holes in the outer edge of the cover plate 20, thereby cooling the bearing seat 5 inside the fan. The air flow direction is clear, and the turbulence phenomenon is reduced.

[0023] In this embodiment, the airflow seat 7 is sealingly connected to the inner flat plate 81 at the top of the heat insulation box 8 by bolts, and the airflow seat 7 is provided with a sealing baffle 73 close to the circumferential middle part of one side of the inner flat plate 81. The sealing baffle 73 prevents air from overflowing from the bottom of the airflow seat 7, which can cause sealing failure and poor cooling effect of the main shaft.

[0024] In this embodiment, the impeller 10 includes a disc 101 close to one side of the heat insulation box 8, a plurality of blades 102 are circumferentially distributed on the end surface of the disc 101 away from the heat insulation box 8, and a shaft sleeve 103 is arranged at the center of the disc 101 and is installed on the main shaft 9. Such a semi-open impeller 10 makes the circulating air flow outward along the radial direction, and the direction of the formed air flow can drive the nitrogen flow to smoothly flow into the high-temperature furnace from the gap 82, thereby further reducing the hot air in the high-temperature furnace entering the fan along the main shaft, and better protecting the main shaft and the bearing.

[0025] In this embodiment, the filler in the heat insulation layer 6 and the heat insulation box 8 is heat insulation cotton. The heat insulation cotton has the characteristics of high temperature resistance, non-combustibility, light weight, and low thermal conductivity.

[0026] In this embodiment, the bearing 13 is also connected with an oil injection pipe 14, and the oil injection pipe 14 extends out of the cover plate 20 to form an oil injection port 15 for adding lubricating oil. The two bearings 13 are both high-temperature-resistant deep groove ball bearings, and the oil injection port 15 is arranged outside to facilitate the addition of lubricating oil to the bearings 13 and ensure the operation effect of the bearings 13.

[0027] In the embodiment, the elastic sealing ring 72 is made of polytetrafluoroethylene material, and a skeleton is wrapped inside the elastic sealing ring 72. After the elastic sealing ring 72 is sealed to the main shaft 9, the elasticity of the elastic sealing ring 72 generates a certain radial holding force on the main shaft 9, achieving the purpose of sealing. At the same time, nitrogen is filled into the air cavity 71 to form a certain air pressure, and then the nitrogen passes through the lower end of the elastic sealing ring 72 from the gap 82 into the high-temperature furnace to form a layer of sealed gas barrier around the main shaft 9, thereby preventing the high-temperature and high-heat gas from flowing into the fan, ensuring the heat insulation effect and the normal operation of the bearing 13, and also cooling the nearby elastic sealing ring 72 and the main shaft 9, thereby prolonging the service life of the fan.

[0028] The working process of the utility model is as follows:

[0029] According to the drawings 1-2, first, after the fan is completely assembled, the flange edge 18 is installed on the side wall of the high-temperature furnace, and one side of the heat insulation box body 4 extends into the high-temperature furnace chamber;

[0030] Then, when the high-temperature furnace starts to circulate hot air, the motor 1 starts to rotate, the impeller 10 starts to rotate, drives the hot air in the high-temperature furnace to circulate and flow, the fan 11 rotates, drives the air in the air pipe 16 to enter the cold air cavity 19, and then overflow from the air outlet cavity 21 to cool the bearing seat 5, the nitrogen pipe 2 is filled with nitrogen, the air cavity 71 of the air flow seat 7 forms high pressure, and the nitrogen flow flows from the gap 82 at the lower end of the main shaft 9 into the high-temperature furnace to form an air flow barrier.

[0031] The above embodiments only exemplarily illustrate the principle and effect of the utility model creation, and part of the applied embodiments, but are not used to limit the utility model; it should be pointed out that for ordinary skilled persons in the art, without departing from the creative concept of the utility model, a number of modifications and improvements can be made, which all belong to the protection scope of the utility model.

Claims

1. A high temperature resistant, thermocycling fan, characterized in that, The application relates to a high-temperature furnace with a heat insulation box (4), a motor (1) is arranged on the top of the heat insulation box (4), the bottom output end of the motor (1) is in transmission connection with the upper end of a main shaft (9), the main shaft (9) penetrates through the heat insulation box (4) and extends downwards, a vane (10) is arranged on the lower end of the main shaft (9), the middle upper portion of the heat insulation box (4) is internally provided with a cavity for heat dissipation, the side wall of the cavity is provided with a heat insulation interlayer (6), the lower portion of the heat insulation box (4) is provided with a heat insulation box (8), the heat insulation interlayer (6) and the heat insulation box (4) are internally provided with a filling material for heat insulation, a gas flow seat (7) is arranged on the outer circumference of the main shaft (9) at the bottom of the middle upper portion cavity of the heat insulation box (4), the bottom of the gas flow seat (7) is fixed on the top of the heat insulation box (8), a gas cavity (71) is arranged on the inner middle portion of the gas flow seat (7) and surrounds the main shaft (9), a nitrogen gas pipe (2) is arranged on the top of the heat insulation box (4) and penetrates into the gas cavity (71), recesses are arranged on the inner sides of the upper end and the lower end of the gas flow seat (7) and surround the main shaft (9), two rows of parallel elastic sealing rings (72) are arranged in the upper end recess of the gas flow seat (7), one row of elastic sealing rings (72) is arranged in the lower end recess of the gas flow seat (7), lubricating oil is coated on the contact position between the inner circumference of each elastic sealing ring (72) and the outer circumference of the main shaft (9), a gap (82) is reserved between the inner center of the heat insulation box (8) and the main shaft (9), when the main shaft (9) rotates, the pressurized nitrogen gas can overflow from the elastic sealing ring (72) at the lower end of the gas flow seat (7), enter the high-temperature furnace through the gap (82).

2. The high-temperature, high-cycle resistant fan of claim 1, wherein, A cover plate (20) is arranged on the top of the heat insulation box (4), the motor (1) is fixed on the cover plate (20) through a motor support frame (17), the output end of the motor (1) is connected with the main shaft (9) through a flexible coupling (3), and a flange edge (18) is radially arranged on the top of the heat insulation box (4) for installation.

3. The high-temperature, high-cycle resistant fan of claim 2, wherein, Two bearings (13) are arranged on the upper portion of the main shaft (9) and are separated from each other, the two bearings (13) are arranged on a bearing seat (5), the two ends of the bearing seat (5) are fixed on the cover plate (20) and a partition plate (12) respectively, the four circumferential edges of the partition plate (12) are fixed on the inner side wall of the cavity of the heat insulation box (4), the partition plate (12) divides the cavity in the middle upper portion of the heat insulation box (4) into an air outlet cavity (21) and a cold air cavity (19) from top to bottom, a fan (11) is arranged on the main shaft (9) and is located in the cold air cavity (19), an air pipe (16) extends out of the cover plate (20) and penetrates into the cold air cavity (19), a plurality of air outlet holes are arranged on the cover plate (20) close to the four circumferential edges, a plurality of air outlet holes are arranged on the partition plate (12) close to the bearing seat (5), when the fan (11) rotates, air enters the cold air cavity (19) from the air pipe (16) and flows out through the air outlet cavity (21).

4. The high-temperature resistant thermal cycling fan of claim 1 or 2 or 3, wherein, The gas flow seat (7) is sealingly connected on the inner flat plate (81) on the top of the heat insulation box (8) through bolts, and the circumferential middle portion of the surface of the gas flow seat (7) close to the inner flat plate (81) is provided with a sealing baffle ring (73).

5. The high-temperature resistant thermal cycling fan of claim 1 or 2 or 3, wherein, The impeller (10) comprises a wheel disc (101) close to one side of the heat insulation box (8), and the wheel disc (101) is provided with blades (102) in a circumferential distribution on the end face of the side opposite to the heat insulation box (8), and the center of the wheel disc (101) is provided with a shaft sleeve (103) mounted on the main shaft (9).

6. The high-temperature resistant thermal cycling fan of claim 1 or 2 or 3, wherein, The heat insulation layer (6) and the filler in the heat insulation box (8) are heat insulation cotton.

7. The high-temperature, high-cycle resistant fan of claim 3, wherein, The bearing (13) is also communicated with an oil injection pipe (14), and the bearing (13) is provided with an oil injection pipe (14) extending out of the cover plate (20) and an oil injection opening (15) for adding lubricating oil.

8. The high-temperature resistant thermal cycling fan of claim 1 or 2 or 3, wherein, The elastic sealing ring (72) is made of polytetrafluoroethylene, and the elastic sealing ring (72) is provided with a skeleton inside.

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