Nitrogen cooling structure of uniform-temperature fan for furnace

Abstract

The invention provides a furnace temperature equalizing fan nitrogen cooling structure. The furnace temperature equalizing fan nitrogen cooling structure comprises a heating furnace, a temperature equalizing fan, a nitrogen inlet main pipeline and a nitrogen outlet main pipeline; the uniform-temperature fan is connected to the top of the heating furnace, is connected with the nitrogen inlet main pipeline and is connected with the nitrogen outlet main pipeline; process nitrogen passing through the gas distribution frame can be introduced into the heating furnace through the uniform-temperature fan, the heat dissipation problem of the uniform-temperature fan is effectively solved, and nitrogen recycling is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat treatment, and particularly relates to a nitrogen cooling structure for a temperature equalizing fan used in a furnace. Background Art

[0002] When the heat treatment quenching furnace and carburizing furnace are normally processing workpieces, the temperature inside the furnace is 820 - 950 °C. In order to make the temperature inside the heating furnace uniform and the workpieces be heated evenly, a temperature equalizing fan system is usually installed. The temperature equalizing fan is very easy to be damaged during use because it is in direct contact with the inside of the heating furnace. The lubricating oil of the bearing will deteriorate at high temperature, resulting in the steel balls not being able to rotate normally, and finally the bearing is damaged. The motor coil is also easy to burn out at high temperature, and the motor shaft will deform at high temperature, not meeting the requirement of shaft concentricity. Summary of the Invention

[0003] In view of the above problems, the purpose of the present application is to provide a nitrogen cooling structure for a temperature equalizing fan used in a furnace, which can realize that the process nitrogen of the gas distribution frame passes through the temperature equalizing fan and is introduced into the heating furnace, effectively solving the heat dissipation problem of the temperature equalizing fan and realizing the reuse of nitrogen.

[0004] To achieve the above partial or all purposes or other purposes, the present application provides the following technical solutions:

[0005] Further, the temperature equalizing fan includes a motor, a rotating shaft, a housing, a bearing assembly, a cooling sandwich layer, a heat insulation layer, fan blades, a nitrogen inlet pipe branch and a nitrogen outlet pipe branch; one end of the rotating shaft is connected to the motor, the other end of the rotating shaft is connected to the fan blades, the bearing assembly, the cooling sandwich layer and the heat insulation layer are sequentially sleeved on the rotating shaft, and the bearing assembly is arranged close to the motor; the bearing assembly and the cooling sandwich layer are arranged inside the housing; the nitrogen inlet main pipeline is connected to the cooling sandwich layer through the nitrogen inlet pipe branch, and the nitrogen outlet main pipeline is connected to the cooling sandwich layer through the nitrogen outlet pipe branch.

[0006] Further, the cooling sandwich layer is a sealed sandwich layer, and the heat insulation layer is made of heat insulation cotton material.

[0007] Further, the temperature equalizing fan further includes an L-shaped pipeline and a lubricating oil cup; the bearing assembly is connected to the lubricating oil cup through the L-shaped pipeline.

[0008] Further, the temperature equalizing fan further includes a taper pin; the rotating shaft and the fan blades are rigidly connected through the taper pin.

[0009] Further, it further includes a flange; the heating furnace is connected to the housing through the flange, an annular boss is provided on the outer peripheral surface of the housing, and threaded holes matching the flange are provided on the annular boss.

[0010] Further, there are five temperature equalizing fans, and the five temperature equalizing fans are arranged in parallel.

[0011] Further, an intake pointer pressure gauge and an intake pressure detection switch are provided on the main nitrogen intake pipeline, and an outlet pointer pressure gauge and an outlet pressure detection switch are provided on the main nitrogen outlet pipeline.

[0012] Further, it further includes an opposed light grating, and the opposed light grating includes a transmitting end and a receiving end; a plurality of through holes are formed in the furnace wall of the heating furnace, and the transmitting end and the receiving end are connected to the outer surface of the furnace wall of the heating furnace through the through holes, and the transmitting end and the receiving end are arranged on two opposite sides of the furnace wall of the heating furnace.

[0013] Further, it further includes five thermocouples; the thermocouples are arranged on the heating furnace, and the thermocouples are arranged close to the temperature equalizing fan.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The temperature equalizing fan is actively cooled by process nitrogen, solving the heat dissipation problems of components such as fan bearings and motors in a high-temperature environment; the cooled high-temperature nitrogen is directly introduced into the heating furnace for reuse, avoiding nitrogen waste and significantly reducing the process gas cost. Taking process nitrogen as a medium, the "cooling function" and "gas reuse" are deeply integrated. While solving the problem of high-temperature failure of the temperature equalizing fan, zero resource waste is achieved, providing a highly reliable and low-cost solution for high-temperature heat treatment equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the temperature equalizing fan; Figure 2 is a top view of the temperature equalizing fan; Figure 3 is a schematic structural diagram of the L-shaped pipeline and the lubricating oil cup; Figure 4 is a schematic structural diagram of the present invention; Figure 5 is a top view of the present invention; Figure 6 is a right view of the present invention; In the figures: 1, motor; 2, rotating shaft; 3, bearing assembly; 4, cooling interlayer; 5, heat insulation layer; 6, fan blade; 7, branch of nitrogen intake pipeline; 8, branch of nitrogen outlet pipeline; 9, L-shaped pipeline; 10, lubricating oil cup; 11, split pin; 12, heating furnace; 13, temperature equalizing fan; 14, main nitrogen intake pipeline; 15, main nitrogen outlet pipeline; 16, housing; 1601, annular boss; 17, intake pointer pressure gauge; 18, intake pressure detection switch; 20, outlet pointer pressure gauge; 21, outlet pressure detection switch; 23, transmitting end; 24, receiving end; 25, thermocouple. DETAILED DESCRIPTION OF THE INVENTION

[0016] To make the structure and function of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention.

[0017] See the attached Figure 1-6 , the nitrogen cooling structure of the furnace uniform temperature fan, includes a heating furnace 12, a uniform temperature fan 13, a nitrogen inlet main pipeline 14, and a nitrogen outlet main pipeline 15; the uniform temperature fan 13 is connected to the top of the heating furnace 12, the uniform temperature fan 13 is connected to the nitrogen inlet main pipeline 14, and the uniform temperature fan 13 is connected to the nitrogen outlet main pipeline 15.

[0018] The uniform temperature fan 13 includes a motor 1, a rotating shaft 2, a housing 16, a bearing assembly 3, a cooling sandwich 4, a heat insulation layer 5, fan blades 6, a nitrogen inlet pipeline branch 7, and a nitrogen outlet pipeline branch 8; one end of the rotating shaft 2 is connected to the motor 1, the other end of the rotating shaft 2 is connected to the fan blades 6, the bearing assembly 3, the cooling sandwich 4, and the heat insulation layer 5 are sequentially sleeved on the rotating shaft 2, and the bearing assembly 3 is arranged close to the motor 1; the bearing assembly 3 and the cooling sandwich 4 are arranged inside the housing 16; the nitrogen inlet main pipeline 14 is connected to the cooling sandwich 4 through the nitrogen inlet pipeline branch 7, and the nitrogen outlet main pipeline 15 is connected to the cooling sandwich 4 through the nitrogen outlet pipeline branch 8. Each branch of the nitrogen inlet pipeline branch 7 and the nitrogen outlet pipeline branch 8 has a manual valve.

[0019] The cooling sandwich 4 is a sealed sandwich, and the heat insulation layer 5 is made of heat insulation cotton; the sealed cooling sandwich is filled with low-temperature nitrogen to ensure that the bearing assembly is within a safe temperature range; the heat insulation layer 5 is made of heat insulation cotton, effectively isolating the internal heat radiation of the furnace and reducing the risk of high-temperature burnout of the motor 1 coil; the cooling sandwich 4 and the heat insulation layer 5 work together to inhibit the thermal deformation of the rotating shaft 2 and ensure the concentricity of the shafting.

[0020] The uniform temperature fan 13 further includes an L-shaped pipeline 9 and a lubricating oil cup 10; the bearing assembly 3 is connected to the lubricating oil cup 10 through the L-shaped pipeline 9. The independent lubricating oil cup 10 continuously supplies oil to the bearing through the L-shaped pipeline 9, preventing the lubricating oil from deteriorating at high temperatures and avoiding bearing jamming.

[0021] The uniform temperature fan 13 further includes a bevel pin 11; the rotating shaft 2 and the fan blades 6 are rigidly connected through the bevel pin 11 to avoid loosening and falling off under high-speed rotation.

[0022] It also includes a flange; the heating furnace 12 is connected to the housing 16 through the flange, and an annular boss 1601 is provided on the outer peripheral surface of the housing 16, and threaded holes matching the flange are provided on the annular boss 1601. The heating furnace 12 is welded to the flange; the housing 16 is detachably connected to the heating furnace 12 through the flange, and the design of the annular boss 1601 and the threaded holes ensures stable installation and easy maintenance.

[0023] There are five uniform temperature fans 13, and the five uniform temperature fans 13 are connected in parallel. The parallel design of multiple uniform temperature fans improves the temperature uniformity in the furnace, and at the same time, the branch valves support independent regulation of single fans.

[0024] An intake pointer pressure gauge 17 and an intake pressure detection switch 18 are arranged on the nitrogen intake main pipeline 14, and an outlet pointer pressure gauge 20 and an outlet pressure detection switch 21 are arranged on the nitrogen outlet main pipeline 15. Realize real-time monitoring and precise adjustment of flow and pressure. Manual valves are arranged on each nitrogen intake pipeline branch 7 and nitrogen outlet pipeline branch 8 to facilitate flow adjustment.

[0025] It further includes an opposed beam grating, and the opposed beam grating includes a transmitting end 23 and a receiving end 24; a plurality of through holes are formed in the furnace wall of the heating furnace 12, and the transmitting end 23 and the receiving end 24 are connected to the outer surface of the furnace wall of the heating furnace 12 through the through holes, and the transmitting end 23 and the receiving end 24 are arranged on two opposite sides of the furnace wall of the heating furnace 12. The opposed beam grating is connected to each pipeline, and a flow meter and a manual valve are arranged on each pipeline connected to the opposed beam grating to adjust the flow; there are thirteen groups of opposed beam gratings, and the thirteen groups of opposed beam gratings (transmitting end 23 / receiving end 24) are installed across the furnace wall to monitor the operation status of the pipeline and the fan in real time, and trigger an alarm when abnormal.

[0026] It further includes thermocouples 25, and there are five thermocouples 25, one near each uniform temperature fan; the thermocouples 25 are arranged on the heating furnace 12, and the thermocouples 25 are arranged close to the uniform temperature fans 13 to prevent local overheating; the thermocouples 25 are used to measure the actual temperature in the heating furnace.

[0027] The above-disclosed are only the preferred embodiments of the present application. Of course, the scope of rights of the present application cannot be limited thereby. Therefore, equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims

1. Nitrogen cooling structure of the uniform temperature fan for furnace, characterized in that: It includes a heating furnace (12), an isothermal fan (13), a total nitrogen inlet pipeline (14), and a total nitrogen outlet pipeline (15); the isothermal fan (13) is connected to the top of the heating furnace (12), the isothermal fan (13) is connected to the total nitrogen inlet pipeline (14), and the isothermal fan (13) is connected to the total nitrogen outlet pipeline (15).

2. The nitrogen cooling structure of the furnace uniform temperature fan according to claim 1, wherein: The isothermal fan (13) includes a motor (1), a rotating shaft (2), a housing (16), a bearing assembly (3), a cooling sandwich layer (4), a heat insulation layer (5), fan blades (6), a nitrogen inlet pipeline branch (7), and a nitrogen outlet pipeline branch (8); one end of the rotating shaft (2) is connected to the motor (1), the other end of the rotating shaft (2) is connected to the fan blades (6), the bearing assembly (3), the cooling sandwich layer (4), and the heat insulation layer (5) are sequentially sleeved on the rotating shaft (2), and the bearing assembly (3) is arranged close to the motor (1); the bearing assembly (3) and the cooling sandwich layer (4) are arranged inside the housing (16); the total nitrogen inlet pipeline (14) is connected to the cooling sandwich layer (4) through the nitrogen inlet pipeline branch (7), and the total nitrogen outlet pipeline (15) is connected to the cooling sandwich layer (4) through the nitrogen outlet pipeline branch (8).

3. The isothermal fan according to claim 2, wherein: The cooling sandwich layer (4) is a sealed sandwich layer, and the heat insulation layer (5) is made of heat insulation cotton material.

4. The isothermal fan according to claim 2, wherein: The isothermal fan (13) further includes an L-shaped pipeline (9) and a lubricating oil cup (10); the bearing assembly (3) is connected to the lubricating oil cup (10) through the L-shaped pipeline (9).

5. The isothermal fan according to claim 2, wherein: The isothermal fan (13) further includes a bevel pin (11); the rotating shaft (2) and the fan blades (6) are rigidly connected through the bevel pin (11).

6. The nitrogen cooling structure of the furnace uniform temperature fan according to claim 2, characterized in that: It further includes a flange; the heating furnace (12) is connected to the housing (16) through the flange, an annular boss (1601) is provided on the outer peripheral surface of the housing (16), and threaded holes matching the flange are provided on the annular boss (1601).

7. The nitrogen cooling structure of the furnace uniform temperature fan according to claim 1, characterized in that: There are five isothermal fans (13), and the five isothermal fans (13) are connected in parallel.

8. The nitrogen cooling structure of the furnace uniform temperature fan according to claim 1, characterized in that: An inlet pointer pressure gauge (17) and an inlet pressure detection switch (18) are provided on the total nitrogen inlet pipeline (14), and an outlet pointer pressure gauge (20) and an outlet pressure detection switch (21) are provided on the total nitrogen outlet pipeline (15).

9. The nitrogen cooling structure of the furnace uniform temperature fan according to claim 1, characterized in that: It further includes an opposed light grating, and the opposed light grating includes a transmitting end (23) and a receiving end (24); a plurality of through holes are formed in the furnace wall of the heating furnace (12), the transmitting end (23) and the receiving end (24) are connected to the outer surface of the furnace wall of the heating furnace (12) through the through holes, and the transmitting end (23) and the receiving end (24) are arranged on two opposite sides of the furnace wall of the heating furnace (12).

10. The nitrogen cooling structure of the furnace uniform temperature fan according to claim 1, characterized in that: It further includes thermocouples (25), and there are five thermocouples (25); the thermocouples (25) are arranged on the heating furnace (12), and the thermocouples (25) are arranged close to the isothermal fan (13).

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