A vacuum sintering furnace capable of balancing pressure differentials uses a water-cooled motor.

Abstract

This utility model discloses a water-cooled motor for a vacuum sintering furnace that can balance pressure differences. A water-cooled transition seat for cooling the rotating shaft is installed on the motor housing. The rotating shaft has an axial ventilation groove group along its axis, with one end extending outward into the vacuum sintering furnace body and the other end extending into and communicating with the motor housing. By adding one or more axial ventilation groove groups to the rotating shaft, the pressure difference between the inside of the water-cooled motor housing and the inside of the vacuum sintering furnace body can be dynamically balanced to achieve a balanced atmosphere. On the one hand, this avoids the water-cooled motor housing becoming a "hidden venting source," eliminating its impact on the vacuum level of the vacuum sintering furnace body. On the other hand, it allows an atmospheric state to be formed inside the water-cooled motor housing, ensuring normal electrode startup. Simultaneously, by adding a water-cooled transition seat to cool the rotating shaft extending into the vacuum sintering furnace body, high temperature conduction to the inside of the water-cooled motor housing can be prevented from damaging the motor structure, further ensuring startup stability.

Description

Technical Field

[0001] This utility model relates to the field of water-cooled motor technology for vacuum sintering furnaces, specifically to a water-cooled motor for vacuum sintering furnaces that can balance pressure differences. Background Technology

[0002] Water-cooled motors for vacuum sintering furnaces are special motors adapted to high-temperature furnace conditions (internal thermal field temperature can reach around 1800℃) and vacuum furnace conditions. They rely on a water-cooling system for efficient heat dissipation, while a sealed design ensures a vacuum environment inside the furnace. Currently, most water-cooled motors used are direct-drive type, which have a compact structure and do not require redundant installation of transmission structures.

[0003] However, in this structure, the motor shaft extends deep into the furnace body, requiring a cooling circuit to cool it in high-temperature environments. The long, narrow cooling pipes and the annular connecting parts such as bearings on the shaft hinder airflow exchange between the furnace body and the motor, creating a pressure difference. When the furnace body is evacuated to a negative pressure state, the air inside the motor cannot be extracted in time, forming a "hidden venting source." Gas in the gas chamber slowly diffuses through gaps, resulting in prolonged evacuation time and affecting the vacuum level of the furnace body.

[0004] Furthermore, the motor cannot start in a vacuum environment. Air is an important insulating medium inside the motor, and if there are tiny impurities in a vacuum environment, the "vacuum breakdown effect" can easily cause discharge between the windings and the casing, leading to pneumatic failures. Therefore, when the furnace is filled with inert gas and the motor needs to be started, the gas should diffuse synchronously into the motor casing. However, due to the gas obstruction of the existing structure, the motor cannot start in time.

[0005] To solve the above problems, a water-cooled motor is needed to provide a vacuum sintering furnace that can balance the internal and external pressure difference. Utility Model Content

[0006] The purpose of this invention is to provide a water-cooled motor for a vacuum sintering furnace that can balance pressure differences, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a water-cooled motor for a vacuum sintering furnace capable of balancing pressure differences, comprising a water-cooled motor housing and a rotating shaft. A water-cooled transition seat for cooling the rotating shaft is installed on the water-cooled motor housing. An axial ventilation groove group is provided along the axial direction of the rotating shaft. One end of the ventilation groove group extends outward into the vacuum sintering furnace body, and the other end extends into and communicates with the water-cooled motor housing, thereby conducting gas between the vacuum sintering furnace and the water-cooled motor housing to balance the pressure difference between the water-cooled motor housing and the vacuum sintering furnace body.

[0008] Preferably, the ventilation groove group is at least one group along the circumference of the rotating shaft, and the ventilation groove group is symmetrically arranged along the circumference of the rotating shaft to maintain the dynamic balance of the rotating shaft.

[0009] Preferably, the venting groove has a diameter of 2mm and a depth of 2mm, making it long and narrow. This restricts the gas flow rate within a single channel, allowing the gas to undergo cooling over a certain distance before entering the water-cooled motor housing. This prevents high-temperature gas from the furnace from directly entering the water-cooled motor housing and damaging components.

[0010] Preferably, the inner hole of the water-cooled transition seat is clearance-fitted with the rotating shaft, and an annular water-cooling cavity is provided inside, with a width of 100mm. The water-cooled transition seat is provided with an inlet seat and an outlet seat on the outside. The inlet seat and the outlet seat are connected to external circulating cooling water through pipes. The circulating cooling water cools the rotating shaft and prevents the high temperature of the vacuum sintering furnace body from being transmitted to the inside of the water-cooled motor housing through the rotating shaft, which would cause the motor winding insulation to age, the bearing lubrication to fail, and reduce the service life.

[0011] Preferably, the water-cooled transition seat is integrated with a mounting flange for bolt connection to the furnace body flange on the vacuum sintering furnace body, and one end of the ventilation groove group extends outward beyond the connection end face of the furnace body flange.

[0012] Preferably, the water-cooled motor housing adopts a water-cooling jacket structure for cooling the main body of the motor.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: by adding one or more sets of axial ventilation grooves to the rotating shaft, the pressure difference between the inside of the water-cooled motor housing and the inside of the vacuum sintering furnace can be dynamically balanced to achieve the purpose of balancing the atmosphere. On the one hand, it can avoid the water-cooled motor housing from becoming a "hidden venting source" and eliminate the impact on the vacuum degree of the vacuum sintering furnace. On the other hand, it can create an atmosphere inside the water-cooled motor housing to ensure normal electrode startup. At the same time, by adding a water-cooled transition seat to the rotating shaft to cool the rotating shaft that extends into the vacuum sintering furnace, it can prevent high temperature from being conducted to the inside of the water-cooled motor housing and damaging the motor structure, further ensuring startup stability. This utility model has a simple structure, reliable function, and is easy to implement. It can be applied to the operating conditions of vacuum sintering furnaces. Attached Figure Description

[0014] Figure 1 This is the main view of the overall structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the rotating shaft.

[0016] Figure 3 This is the main structural view of the water-cooled transition seat.

[0017] Figure 4 This is the left view of this utility model.

[0018] Explanation of reference numerals in the attached figures: 1. Shaft; 2. Furnace body flange; 3. Water-cooled transition seat; 4. Front bearing; 5. Water-cooled motor housing; 6. Rotor; 7. Stator winding; 8. Junction box; 9. End cover; 10. Rear bearing; 11. Ventilation slot assembly. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-4 This utility model provides a technical solution: a water-cooled motor for a vacuum sintering furnace that can balance pressure difference, including a water-cooled motor housing 5, a rotor 6, a stator winding 7, a water-cooled transition seat 3, an end cover 9, a sealing assembly, and a junction box 8. The rotor 6 includes a rotating shaft 1. The water-cooled transition seat 3 for cooling the rotating shaft 1 is connected to the water-cooled motor housing 5. The rotating shaft 1 has an axial ventilation groove group 11. One end of the ventilation groove group 11 extends outward into the vacuum sintering furnace body, and the other end extends into and communicates with the water-cooled motor housing 5, conducting gas between the vacuum sintering furnace and the water-cooled motor housing 5 to balance the pressure difference between the water-cooled motor housing 5 and the vacuum sintering furnace body.

[0021] The working principle of the water-cooled motor is the same as that of the water-cooled motor in the prior art.

[0022] The water-cooled motor housing 5 is connected to an end cover 9. The water-cooled transition seat 3 is provided with a front support bearing, and the end cover 9 is provided with a rear support bearing. The rotating shaft 1 passes through the front support bearing and the rear support bearing respectively.

[0023] The ventilation slot group 11 consists of at least one group along the circumference of the rotating shaft 1, and the ventilation slot group 11 is a symmetrical ventilation slot along the circumference of the rotating shaft 1, used to maintain the rotational dynamic balance of the rotating shaft 1.

[0024] The ventilation slot has a diameter of 2mm and a depth of 2mm, making it long and narrow. This design limits the gas flow rate within a single channel, allowing the gas to undergo cooling over a certain distance before entering the water-cooled motor housing 5. This prevents high-temperature gas from the furnace from directly entering the water-cooled motor housing 5 and damaging components.

[0025] The inner hole of the water-cooled transition seat 3 is fitted with the rotating shaft 1 with clearance and is sleeved on the rotating shaft 1. The water-cooled transition seat 3 has an annular water-cooling cavity inside, and the width of the water-cooling cavity is 100mm. The water-cooled transition seat 3 is provided with a water inlet seat and a water outlet seat on the outside. The water inlet seat and the water outlet seat are connected to an external cooling water circulation system. The rotating shaft 1 is cooled by circulating cooling water, which avoids the high temperature of the vacuum sintering furnace body from being transmitted to the water-cooled motor housing 5 through the rotating shaft 1, which would cause the motor winding insulation to age, the bearing lubrication to fail, and reduce the service life.

[0026] The water-cooled transition seat 3 is integrated with an installation flange, which is directly connected to the furnace body flange 2 on the vacuum sintering furnace body by bolts. One end of the ventilation groove group 11 extends outward beyond the connection end face of the furnace body flange 2. The end face of the installation flange is a smooth sealing surface, which forms a vacuum seal with the sealing ring in the sealing groove of the furnace body flange 2.

[0027] All water-cooling cavities are externally welded with no hidden welds, making it easy to spot any leaks.

[0028] The junction box 8 and the water-cooled motor housing 5 are connected by a connecting flange. The connecting flange is a loose flange with an interface size that meets national standard vacuum flange size, which can improve the versatility of the connecting flange. The flange end face is provided with an annular sealing groove, and a sealing ring is installed inside to form a vacuum seal.

[0029] The water-cooled motor housing 5 adopts a water-cooling jacket structure, which is equipped with a water inlet seat and a water outlet seat. The water inlet seat and the water outlet seat are connected to an external cooling water circulation system for cooling the main body of the motor.

[0030] Working principle: The water-cooled motor is directly connected to flange 2 of the vacuum sintering furnace body; When the furnace body begins to be evacuated, the gas inside the water-cooled motor casing 5 is simultaneously extracted through the axial ventilation slot group 11, maintaining a pressure balance with the furnace body. When the furnace body heats up, the cooling water circulation system is started. The cooling water circulates in the water-cooled transition seat 3 to remove the heat from the components and prevent high temperature damage to the motor components, thus affecting their service life. When the furnace body is cooled, the water-cooled motor drives the fan (not shown in the figure) to rotate, which accelerates the flow of gas in the furnace and cools it down. At this time, the furnace body is filled with inert gas. The gas enters the water-cooled motor housing 5 through the axial guide gas channel group 11 to ensure that the motor can start normally and avoid vacuum discharge damage to the equipment.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A water-cooled motor for a vacuum sintering furnace capable of balancing pressure differentials, comprising a water-cooled motor housing and a rotating shaft, characterized in that: The water-cooled motor housing is equipped with a water-cooled transition seat for cooling the rotating shaft. The rotating shaft has an axial ventilation groove group along the axial direction. One end of the ventilation groove group extends outward into the vacuum sintering furnace body, and the other end extends into and communicates with the water-cooled motor housing, so as to conduct gas between the vacuum sintering furnace and the water-cooled motor housing and balance the pressure difference between the water-cooled motor housing and the vacuum sintering furnace body.

2. The vacuum sintering furnace with balanced pressure differential as described in claim 1 uses a water-cooled motor, characterized in that: The ventilation slot group consists of at least one group along the circumference of the rotating shaft, and the ventilation slot group is symmetrical along the circumference of the rotating shaft, which is used to maintain the dynamic balance of the rotating shaft.

3. The vacuum sintering furnace with balanced pressure differential as described in claim 2 uses a water-cooled motor, characterized in that: The ventilation slot has a width of 2mm and a depth of 2mm.

4. The vacuum sintering furnace capable of balancing pressure difference according to claim 1 uses a water-cooled motor, characterized in that: The inner hole of the water-cooled transition seat is clearance-fitted with the rotating shaft, and an annular water-cooling cavity is provided inside. The width of the water-cooling cavity is 100mm. The water-cooled transition seat is provided with an inlet seat and an outlet seat on the outside. The inlet seat and the outlet seat are connected to external circulating cooling water through pipes.

5. The vacuum sintering furnace capable of balancing pressure differentials according to claim 1 uses a water-cooled motor, characterized in that: The water-cooled transition seat is integrated with a mounting flange for bolt connection to the furnace body flange on the vacuum sintering furnace body. One end of the ventilation slot group extends outward beyond the connection end face of the furnace body flange.

6. The vacuum sintering furnace with balanced pressure differential as described in claim 1 uses a water-cooled motor, characterized in that: The water-cooled motor housing adopts a water-cooling jacket structure to cool the main body of the motor.

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