Gas quenching furnace sealing structure with bidirectional gas filling tightness device and gas quenching furnace

Abstract

The utility model relates to the technical field of sealing, in particular to a gas quenching furnace sealing structure with a two-way gas filling tightness device, which comprises sealing elements, the sealing elements are sleeved on a main shaft, the sealing elements comprise steel rings and sealing rings, grooves are arranged on the inner sides of the steel rings, the sealing rings are fixedly arranged on the grooves, the main shaft is sleeved with two sealing elements, and the sealing rings are fixedly arranged on the sealing rings. A closed cavity is formed among the two sealing pieces, the main shaft and the bearing seat, an inflation hole is formed in the bearing seat, the inflation hole is communicated with the closed cavity, gas is input into the closed cavity from the inflation hole, the sealing ring expands outwards under the influence of air pressure, meanwhile, protective gas is input into a furnace, the sealing ring can be fully attached to the main shaft, and the sealing effect is achieved. The utility model further discloses the gas quenching furnace with the sealing structure.

Description

TECHNICAL FIELD

[0001] The utility model relates to a sealing technical field, especially, relate to a kind of gas quenching furnace sealing structure and gas quenching furnace with two-way aeration tightness device. BACKGROUND

[0002] The working principle of vacuum gas quenching furnace: first, the hearth is pumped into vacuum to reduce oxidation and pollution, and ensure that the material remains pure during high-temperature processing. In a vacuum environment, the material is heated to the required temperature by resistance heating or induction heating, ensuring uniform heating. The material is kept at the set temperature for a period of time to fully transform its internal structure and achieve the desired heat treatment effect.

[0003] After holding, A has no special process requirements: first, high-purity inert gas (such as nitrogen or argon) is introduced into the furnace, and then the circulating fan is started. The motor is mainly responsible for driving the impeller to rotate at high speed, ensuring uniformity and stability of the temperature in the gas quenching furnace. The high-speed airflow rapidly cools the material, achieving the required hardness and microstructure of the material. After cooling, the gas is turned off, and the treated material is removed when the temperature in the furnace drops to a safe range.

[0004] After holding, B has special process requirements: small and medium-sized work molds require small deformation, high precision and fast cooling and quenching speed. Before refilling the quenching medium nitrogen, the motor is started under negative pressure at the beginning of the quenching stage. Nitrogen is introduced after the motor reaches full speed. The nitrogen is more evenly mixed by the high-speed impeller and quickly cools the small and medium-sized work molds. The resulting stress is small, and the deformation is small. The material is rapidly cooled by high-speed airflow. First, the motor is started, and at this time, the furnace cavity and the motor cavity are in a vacuum state. Motor vacuum discharge phenomenon is inevitable, and the motor starts to rotate before quenching (vacuum start), which can cause motor coil damage.

[0005] Therefore, a seal is provided on the main shaft of the motor to isolate the air flow between the gas quenching furnace and the motor. However, the seal on the market does not have good sealing effect, so a sealing structure needs to be provided on the main shaft of the motor to ensure the closed state of the gas quenching furnace and avoid the vacuum state in the motor space. Utility model content

[0006] Therefore, it is necessary to provide a gas quenching furnace sealing structure with a two-way aeration tightness device.

[0007] The technical solution adopted by this utility model to solve its technical problem is as follows: a gas quenching furnace sealing structure with a bidirectional air-tight device includes a motor, a bearing seat and sealing elements. The motor includes a main shaft, the bearing seat is fixedly connected between the motor and the furnace body, the main shaft rotatably passes through the bearing seat, and there are two sealing elements sleeved on the main shaft. Each sealing element has two mutually opposing and inclined sealing rings. The space between the main shaft and the bearing seat and the two sealing elements forms a closed cavity. The bearing seat has an air-filling hole communicating with the closed cavity.

[0008] Furthermore, the bearing housing has two protrusions on its inner side, and the seal is located between the protrusions.

[0009] Furthermore, the sealing element includes a steel ring, the inner side of which has two grooves, and each steel ring is fixedly connected to two mutually opposing and inclined sealing rings, the steel ring abutting against the protrusion in the horizontal direction along the main axis.

[0010] Furthermore, the sealing ring includes a lip and a fixing part, the fixing part is fixedly connected to the steel ring, and the lip is fitted onto the main shaft and has a wavy shape.

[0011] Furthermore, the gas introduced into the closed cavity through the inflation port is nitrogen.

[0012] Furthermore, the outer layer of the steel ring is provided with a rubber layer.

[0013] Furthermore, an inflation pipe is connected to the port of the inflation hole, and a pressure switch and a solenoid valve are installed on the inflation pipe.

[0014] Furthermore, an impeller is mounted on the main shaft of the motor, and the impeller is located inside the furnace body.

[0015] Furthermore, the bearing housing has a sandwiched water cavity, and the bearing housing surface has a water inlet and a water outlet. The water inlet is connected to the bottom surface of the sandwiched water cavity, and the water outlet is connected to the top wall of the sandwiched water cavity.

[0016] Furthermore, the gas quenching furnace includes the gas quenching furnace sealing structure with a bidirectional airtight device as described in any of the above schemes, and also includes a furnace body, which is fixedly connected to the bearing seat.

[0017] The beneficial effects of this utility model are as follows: This utility model provides a bidirectional airtight device and a gas quenching furnace. By installing a sealing element on the main shaft, a closed cavity is formed between the two sealing elements, the main shaft, and the bearing seat. Then, a vacuum treatment is performed inside the furnace, so that the sealing ring on the left side of the sealing element near the furnace body is tightly attached to the main shaft due to the air pressure. Nitrogen gas is then introduced into the closed cavity and the gas quenching furnace. Under the action of air pressure, the sealing element and the main shaft are further tightly attached, improving the airtightness of the sealing element. At the same time, because the temperature of nitrogen gas is relatively low compared to the furnace, when the impeller conducts the high temperature inside the gas quenching furnace to the main shaft during the quenching process, the nitrogen gas can cool down the main shaft. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the structure of an air quenching furnace.

[0020] Figure 2 This is an enlarged view of point A in the gas quenching furnace.

[0021] The component names and their numbers in the diagram are as follows:

[0022] Motor 1, main shaft 11, bearing 2, inner ring 21, outer ring 22, bearing housing 3, air inlet 31, protrusion 32, water inlet 33, water outlet 34, seal 4, steel ring 41, sealing ring 42, fixing part 421, lip 422, enclosed cavity 5, furnace body 6, jacketed water cavity 7. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0024] like Figure 1 As shown, the gas quenching furnace sealing structure with a bidirectional air-tight device of this utility model includes a motor 1, a bearing 2, a bearing seat 3, a seal 4, and a closed cavity 5. The motor 1 includes a main shaft 11, the bearing 2 is mounted on the main shaft 11, the bearing seat 3 is fixedly mounted on the furnace body 6, the bearing seat 3 is fixedly connected to the bearing 2, and the seal 4 is sleeved on the main shaft 11 and there are two seals 4. A closed cavity 5 is formed between the main shaft 1, the bearing seat 3, and the seal 4.

[0025] Specifically, an impeller (not shown in the figure) is installed on the motor 1 extending along the main shaft 11, and the impeller is located inside the furnace body 6.

[0026] Furthermore, there are two bearings 2, which include an inner ring 21 and an outer ring 22. The inner ring 21 is fixedly sleeved on the main shaft 11, and the outer ring 22 is fixedly connected to the bearing housing 3.

[0027] Furthermore, an air inlet 31 is provided on the bearing housing 3, which is connected to the closed cavity 5. A protrusion 32 is formed on the side of the bearing housing 3 near the main shaft 11, and the bearing 2 abuts against the protrusion 32 in the direction near the closed cavity 5.

[0028] Furthermore, a double-walled water cavity 7 is provided inside the bearing housing 3, and a water inlet 33 and a water outlet 34 are provided on the bearing housing 3. The water inlet 33 is connected to the bottom surface of the double-walled water cavity 7, and the water outlet 34 is connected to the top wall of the double-walled water cavity 7. When the operator injects water into the water inlet 33, the double-walled water cavity 7 is filled with water. Since the water inlet 33 is located at the bottom of the bearing housing 3 and the water outlet 34 is located at the top of the bearing housing 3, ... Figure 1 As shown, water enters the interlayer water cavity 7 from the direction of arrow f1 and drains from the direction of arrow f2.

[0029] Furthermore, since the bearing housing 3 is fixedly installed on the furnace body 6, when the furnace body 6 is subjected to high temperature, the bearing housing 3 is also affected by high temperature. During the process of cooling the bearing housing 3, the water temperature in the jacketed water cavity 7 will rise accordingly. The jacketed water cavity 7 is filled with water from the f1 direction. The water entering the jacketed water cavity 7 first cools the bearing housing 3, and at the same time, the water temperature rises accordingly. The heated hot water then flows back into the water tank through the f2 direction, and the water in the water tank then enters from the f1 direction to form a circulation.

[0030] Specifically, after the water in the jacketed water cavity 7 is heated by the high temperature of the bearing seat 3, the water temperature gradually increases and the density decreases, flowing towards the top of the jacketed water cavity 7. Since the jacketed water cavity 7 continuously receives water from the direction of arrow f1, the heated water flows upward and is then discharged to the water tank from the direction of f2. The water tank then receives water from the direction of f1 into the jacketed water cavity 7. The upward flow trend of the hot water in the jacketed water cavity 7 is consistent with the water circulation direction, which is conducive to the smooth flow of circulating water and improves the cooling effect on the bearing seat 3.

[0031] Furthermore, there are two seals 4 and they are sleeved on the main shaft 11. The seal 4 includes a steel ring 41 and a sealing ring 42. Two sets of grooves are provided on the inner side of the steel ring 41. Each steel ring 41 is fixedly connected to two mutually opposite and inclined sealing rings 42. The seal 4 is close to the bearing 2 and abuts against the protrusion 32 along the horizontal direction of the main shaft 11.

[0032] Furthermore, a rubber layer (not shown in the figure) is provided on the outer layer of the steel ring 41 to increase the sealing between the seal 4 and the bearing housing 3.

[0033] Furthermore, the sealing ring 42 includes a fixing part 421 and a lip 422. The lip 422 is wavy and fits the main shaft 11. When the sealing ring 42 is subjected to gas pressure, the lip 422 fits the main shaft 11 more tightly.

[0034] Specifically, "deviation tilt" means that the two adjacent sealing rings 42 on each seal 4 are in a figure-eight shape, and the lips 422 of the two adjacent sealing rings 42 extend towards the bearings 2 on both sides.

[0035] Furthermore, the air inlet 31 is connected to the closed cavity 5. When the operator puts gas into the air inlet 31, the air pressure in the closed cavity 5 is greater than the external air pressure. At the same time, due to the increased air pressure, the lip 422 of the sealing ring 42, which forms the cavity wall of the closed cavity 5, fits the main shaft 11 more closely, thus improving the airtightness of the seal.

[0036] Specifically, since the sealing element 4 does not completely seal the closed cavity 5, there will be some loss of gas in the closed cavity. Therefore, an inflation pipe is installed at the inflation port 31. A pressure switch and a solenoid valve are installed on the inflation pipe. The pressure switch detects the change in air pressure in the closed cavity 5. When the air pressure in the closed cavity 5 is too low, the pressure switch opens and the solenoid valve inputs gas into the closed cavity 5 through the inflation port 31 to maintain stable air pressure.

[0037] Specifically, before quenching inside the gas quenching furnace, the operator performs a vacuum treatment inside the furnace body 6, such as... Figure 1 As shown, the gas pressure inside the furnace body 6 is lower than the gas pressure in the closed cavity 5, causing the sealing ring 42 on the left side of the sealing element 4 near the furnace body 6 to adhere tightly to the main shaft 11 due to the gas pressure. Subsequently, the operator introduces nitrogen into the closed cavity 5, which further tightens the sealing ring 42 in contact with the closed cavity 5 against the main shaft 11. Finally, the operator introduces a protective gas, nitrogen, into the furnace body 6. Under the action of gas pressure, the sealing ring 42 on the right side of the sealing element 4 near the furnace body 6 adheres tightly to the main shaft 11 due to the gas pressure, thereby improving the airtightness of the sealing element.

[0038] Furthermore, since the gas introduced into the enclosed cavity 5 is nitrogen, which has a lower temperature than the furnace interior, the nitrogen can cool the main shaft 11 as the impeller transfers the high temperature from inside the furnace to the main shaft 11 during the quenching process. This also protects the sealing ring rubber from aging.

[0039] Specifically, after the operator injects nitrogen into the closed cavity 5, the pressure is maintained at 0.1 MPa, and after the operator injects protective gas into the furnace body 6, the pressure is maintained at 1.2 MPa.

[0040] The working principle and usage process of this utility model are as follows: Two sets of sealing elements 4 are installed on the main shaft 11 to perform vacuum treatment inside the furnace body 6, so that the gas pressure inside the furnace body 6 is less than the gas pressure of the closed cavity 5. The sealing ring 42 on the left side of the sealing element 4 near the furnace body 6 is tightly attached to the main shaft 11 due to the gas pressure. The motor 1 is started, and nitrogen gas is introduced into the closed cavity 5 through the air filling hole 31, so that the sealing ring 42 in contact with the closed cavity 5 is further tightly attached to the main shaft 11. Then the air filling hole 4 is sealed, and protective gas is introduced into the furnace body 6. Under the action of gas pressure, the sealing ring 42 on the right side of the sealing element 4 near the furnace body 6 is tightly attached to the main shaft 11 due to the gas pressure.

[0041] This invention creates a closed cavity 5 between two sealing elements 4, the main shaft 11, and the bearing seat 3 by installing a sealing element 4 on the main shaft. Then, a vacuum treatment is performed inside the furnace 6, causing the sealing ring 42 on the left side of the sealing element 4 near the furnace body 6 to be tightly adhered to the main shaft 11 due to air pressure. Nitrogen gas is then introduced into the closed cavity 5 and the gas quenching furnace. Under the action of air pressure, the sealing element 4 and the main shaft 11 are further tightly adhered, improving the airtightness of the sealing element 4. At the same time, because the temperature of nitrogen gas is relatively low compared to the furnace, when the impeller conducts the high temperature inside the gas quenching furnace to the main shaft 11 during the quenching process, the nitrogen gas can cool down the main shaft 11.

[0042] This utility model also provides a gas quenching furnace, including the aforementioned gas quenching furnace sealing structure with a bidirectional gas-tight device, and also includes a furnace body 6. The bidirectional gas-tight device is fixedly connected to the furnace body. Specifically, the bearing seat 3 is fixedly connected to one end of the furnace body 6.

[0043] This invention can increase the furnace pressure within a few seconds of the initial quenching stage. Before the furnace pressure is established, the motor can start directly without regard to the negative pressure inside the furnace, and will not produce a vacuum discharge phenomenon.

[0044] The gas quenching furnace of this utility model has all the technical features of the gas quenching furnace sealing structure with bidirectional gas filling and sealing device mentioned above. Therefore, the gas quenching furnace mentioned above has the same technical effect as the gas quenching furnace sealing structure with bidirectional gas filling and sealing device mentioned above.

[0045] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A sealing structure for a gas quenching furnace with a bidirectional air-tightening device, installed on the furnace body, characterized in that: The gas quenching furnace sealing structure with a bidirectional air-tight device includes a motor, a bearing housing, and sealing elements. The motor includes a main shaft, and the bearing housing is fixedly connected between the motor and the furnace body. The main shaft rotatably passes through the bearing housing. There are two sealing elements, which are sleeved on the main shaft. Each sealing element has two mutually opposing and inclined sealing rings. The space between the main shaft and the bearing housing, located between the two sealing elements, forms a closed cavity. The bearing housing has an air-filling hole that communicates with the closed cavity.

2. The gas quenching furnace sealing structure with a bidirectional air-tightening device as described in claim 1, characterized in that: The bearing housing has two protrusions on its inner side, and the seal is located between the protrusions.

3. The sealing structure of a gas quenching furnace with a bidirectional air-tightening device as described in claim 2, characterized in that: The sealing element includes a steel ring with two grooves on its inner side. Each steel ring is fixedly connected to two mutually opposing and inclined sealing rings. The steel ring abuts against the protrusion in the horizontal direction along the main axis.

4. The sealing structure of a gas quenching furnace with a bidirectional air-tightening device as described in claim 1, characterized in that: The sealing ring includes a lip and a fixing part. The fixing part is fixedly connected to the steel ring, and the lip is fitted onto the main shaft and has a wavy shape.

5. The sealing structure of a gas quenching furnace with a bidirectional air-tightening device as described in claim 2, characterized in that: The gas introduced into the closed cavity through the inflation port is nitrogen.

6. The gas quenching furnace sealing structure with a bidirectional air-tightening device as described in claim 3, characterized in that: The outer layer of the steel ring is provided with a rubber layer.

7. The sealing structure of a gas quenching furnace with a bidirectional air-tightening device as described in claim 1, characterized in that: An inflation pipe is connected to the port of the inflation hole, and a pressure switch and a solenoid valve are installed on the inflation pipe.

8. The sealing structure of a gas quenching furnace with a bidirectional air-tightening device as described in claim 1, characterized in that: An impeller is mounted on the main shaft of the motor, and the impeller is located inside the furnace body.

9. The sealing structure of a gas quenching furnace with a bidirectional air-tight device as described in claim 1, characterized in that: The bearing housing has a double-layered water cavity, and the surface of the bearing housing has a water inlet and a water outlet. The water inlet is connected to the bottom surface of the double-layered water cavity, and the water outlet is connected to the top wall of the double-layered water cavity.

10. A gas quenching furnace, characterized in that... The gas quenching furnace includes the gas quenching furnace sealing structure with a bidirectional air-tight device as described in any one of claims 1-9, and also includes a furnace body, which is fixedly connected to the bearing seat.

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