Sealing seat for rotating shaft of vacuum induction melting furnace

Abstract

The utility model discloses a sealing seat for a rotating shaft of a vacuum induction melting furnace in the field of special metallurgy. The sealing seat is fixed on the outer end face of a bearing on the side wall of a vacuum cavity of the vacuum induction melting furnace. A shaft hole for the rotating shaft to penetrate through is formed in the center of a seat body; the first oil way is formed in the direction perpendicular to the axial direction of the rotating shaft, an inlet is formed in one side of the base, and an outlet is formed in the inner side wall of the shaft hole. The second oil way is formed in the direction perpendicular to the axial direction of the rotating shaft, an outlet is formed in one side of the base, and an inlet is formed in the inner side wall of the shaft hole. The oil-conveying pipe is connected to an inlet of the first oil-way; the oil pumping pipe is connected to an outlet of the second oil way. The filtering device is connected to the oil pumping pipe and is used for filtering impurities and gas in the lubricating grease; an inlet of the oil pumping device is connected with an outlet of the filtering device, and an outlet is connected with the oil conveying pipe; the filling port is connected with an outlet of the oil pumping device and used for filling lubricating grease. According to the utility model, the sealing effect can be ensured and a good sealing effect can be provided.

Description

Technical Field

[0001] The utility model relates to the field of special metallurgy, and particularly to a shaft seal seat of a vacuum induction melting furnace. Background Technique

[0002] A vacuum induction melting furnace (Vacuum Induction Melting Furnace, abbreviated as VIM) is a device for melting metals by electromagnetic induction heating under vacuum conditions. It is widely used in the production of high-quality alloys, especially in the fields of aerospace, medical, automotive and nuclear industries. The vacuum induction melting furnace uses medium-frequency induction heating technology to generate heat in conductive materials through an alternating electromagnetic field, thereby realizing the melting of metals. The induction coil surrounds the crucible containing the metal to be melted. When an alternating current passes through the coil, an induced eddy current will be generated in the metal, quickly raising the temperature and melting the metal.

[0003] The vacuum induction melting furnace mainly includes the following components;

[0004] Furnace body: Provides a sealed vacuum environment, usually made of materials with high temperature resistance and vacuum integrity retention.

[0005] Medium-frequency power supply: Provides the power required for induction heating, including a power supply, a transformer and a control circuit.

[0006] Vacuum system: Consists of a vacuum pump, a vacuum gauge and valves, and is responsible for generating and maintaining a vacuum environment.

[0007] Cooling system: Usually adopts water-cooling channels and fans to prevent overheating.

[0008] Electric control system: Monitors and controls temperature, vacuum degree and input power.

[0009] The working pressure of a vacuum induction melting furnace (VIM) is usually related to its design and operating conditions, referring to the standard of GB / T10067.35-2015 "Basic Technical Conditions for Electric Heating Devices - Part 35: Medium-frequency Vacuum Induction Melting Furnace". It should be noted that the working pressure and operating conditions of the vacuum induction melting furnace should strictly comply with the corresponding safety standards and operating procedures to ensure the safety of the equipment and personnel. The vacuum degree requirement of the vacuum induction melting furnace is a key factor to ensure the smooth progress of the melting process and obtain high-quality molten metal. According to the standard of JB / T 10551-2006 "Vacuum Technology - Vacuum Induction Melting Furnace", the vacuum degree of the vacuum induction melting furnace usually needs to reach and be maintained within a certain range to meet the melting requirements of different metal materials.

[0010] The vacuum induction melting furnace usually requires a rotating shaft connected to the outside world to achieve the following purposes:

[0011] 1. Material transportation: During the smelting process, it may be necessary to feed raw materials or additives into the furnace through a rotating shaft.

[0012] 2. Sample sampling: During the smelting process, it may be necessary to take samples regularly to monitor the smelting quality, and the rotating shaft can be used as a sampling channel.

[0013] 3. Cooling: The rotating shaft may be used to convey a cooling medium to keep certain components of the furnace from overheating at high temperatures.

[0014] 4. Electrical connection: If there are devices in the furnace that need to be powered (such as induction coils), the rotating shaft can be used as a channel for electrical connection.

[0015] Since the external power is transmitted to the actuating components in the vacuum chamber through the rotating shaft, it is very important to ensure the seal of the contact surface of the rotating shaft. If there are defects in the seal, the entry of external air into the chamber will destroy the vacuum environment in the chamber and affect the quality of smelted steel. At the same time, the rotation of the rotating shaft in the seal seat hole will inevitably cause wear and affect the sealing effect.

[0016] Chinese Patent CN220016074U discloses a sealing member for an automotive rotating shaft, including a sealing member body. A through hole is provided on the sealing member body, and two mounting grooves are provided on the sealing member body. An oil injection mechanism is arranged inside the mounting groove. The oil injection mechanism includes an oil filling pipe, an oil tank, an oil outlet pipe, an oil spray pipe, and a control valve I; a pressurization assembly is arranged on the oil outlet pipe. The pressurization assembly includes: a piston plate, the piston plate is movably installed inside the oil outlet pipe; a threaded drive shaft, the threaded drive shaft is rotatably installed inside the oil outlet pipe; a threaded sleeve, the threaded sleeve for connecting the piston plate is threadedly connected to the threaded drive shaft; a servo motor, the servo motor for driving the threaded drive shaft is arranged on the oil outlet pipe. This solution increases the overall pressure inside the oil outlet pipe through the setting of a pressurization mechanism, and the oil pressure when the lubricating oil sprays out through the through hole will increase, and the spraying effect will be better. However, the solution is not applicable to a vacuum induction melting furnace, and the specific reasons are as follows:

[0017] 1. After oil injection, the oil is prone to atomization and may burn or explode in a high-temperature environment, posing a safety hazard.

[0018] 2. It adopts a scheme of axial oil injection and axial oil return. In the case of a large pressure difference at both ends of the seal, it is easy to implement oil injection through a pressurizing device, but oil return cannot be achieved due to the pressure difference.

[0019] 3. This solution has multiple bent circuits and multiple positions with the same pipeline cross-section (changes in cross-section at connection points or bends). In fluid mechanics, bent pipes or channels are indeed prone to significant pressure losses, and the oil tends to accumulate in the installation groove. Under an equal-pressure environment, backflow can be achieved by pressurized oil injection. However, when there is a large pressure difference between the two ends of the seal, the oil accumulated in the installation groove will tend to flow towards the side with lower pressure, which is an unacceptable operating condition for a vacuum induction melting furnace.

[0020] 4. The overall pressure inside the oil pipe is high, while the inside of the vacuum induction melting furnace is in a vacuum environment, causing the oil to be more inclined to flow towards the vacuum environment, which is not conducive to sealing.

[0021] 5. The main problem solved by this oil injection solution is the lubrication problem (refer to paragraphs 004 and 0017 of the specification of CN220016074U). The purpose of the seal is to prevent the loss of lubricating oil, and the seal serves the lubrication.

[0022] Therefore, there is an urgent need for a shaft seal solution that can be used for a vacuum induction melting furnace. Summary of the Utility Model

[0023] A series of simplified concepts are introduced in the Summary of the Utility Model section. These simplified concepts are all simplified from the prior art in this field and will be further described in detail in the Detailed Implementation section. The Summary of the Utility Model section of the present utility model does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.

[0024] The technical problem to be solved by the present utility model is to provide a shaft seal seat for a vacuum induction melting furnace that can provide good sealing effect while ensuring the sealing effect.

[0025] To solve the above technical problem, the shaft seal seat of the vacuum induction melting furnace provided by the present utility model is fixed to the outer end face of the bearing on the side wall of the vacuum cavity of the vacuum induction melting furnace and includes:

[0026] A seat body 1, in the center of which there is formed a shaft hole 2 through which a rotating shaft passes;

[0027] A first oil passage 3 is formed in a direction perpendicular to the axial direction of the rotating shaft. Its inlet is formed on one side of the seat body 1, and its outlet is formed on the inner side wall of the shaft hole 2;

[0028] A second oil passage 4 is formed in a direction perpendicular to the axial direction of the rotating shaft. Its outlet is formed on one side of the seat body 1, and its inlet is formed on the inner side wall of the shaft hole 2;

[0029] An oil delivery pipe 5 is connected to the inlet of the first oil passage 3 and is used to inject lubricating grease into the first oil passage 3;

[0030] The tubing string 6 is connected to the outlet of the second oil passage 4 and is used to extract lubricating grease.

[0031] The filtering device is connected to the tubing string 6 and is used to filter impurities and gas in the lubricating grease.

[0032] The oil pumping device has its inlet connected to the outlet of the filtering device and its outlet connected to the oil transmission pipe 5, and is used to pump out the filtered lubricating grease.

[0033] The filling port is connected to the outlet of the oil pumping device and is used to fill lubricating grease.

[0034] Preferably, further improving the shaft seal seat of the vacuum induction melting furnace, it further includes:

[0035] A plurality of first accommodation grooves 7 are axially arranged up and down in the shaft hole 2.

[0036] A plurality of first sealing rings 8 are arranged one by one in the first accommodation grooves 7.

[0037] Wherein, the first accommodation grooves 7 are axially closer to the outer end face of the bearing on the side wall of the vacuum chamber of the vacuum induction melting furnace than the first oil passage 3 and the second oil passage 4.

[0038] Preferably, further improving the shaft seal seat of the vacuum induction melting furnace, it further includes:

[0039] At least one second accommodation groove 9 is formed around the shaft hole 2 between the seat body 1 and the outer end face of the bearing on the side wall of the vacuum chamber of the vacuum induction melting furnace.

[0040] At least one second sealing ring 10 is correspondingly arranged in the second accommodation groove 9.

[0041] Preferably, further improving the shaft seal seat of the vacuum induction melting furnace, the first oil passage 3 and the second oil passage 4 are collinear.

[0042] Preferably, further improving the shaft seal seat of the vacuum induction melting furnace, the diameter of the inlet of the first oil passage 3 is smaller than the diameter of the outlet of the second oil passage 4.

[0043] Preferably, further improving the shaft seal seat of the vacuum induction melting furnace, it further includes:

[0044] The pressure sensor is arranged on the inner side wall of the shaft hole 2 and is used to measure the pressure of the lubricating grease in the shaft hole 2. If the detected pressure is less than the first threshold value, it sends a first signal to trigger the oil pumping device. If the detected pressure is greater than the second threshold value, it sends a second signal to trigger the oil pumping device, and the first threshold value is less than the second threshold value.

[0045] The oil pumping device starts to pump out the lubricating grease when it receives the first signal and stops pumping out the lubricating grease when it receives the second signal.

[0046] Preferably, the vacuum induction melting furnace shaft seal seat is further improved, and the first seal ring 8 is made of fluorinated rubber.

[0047] In view of the defects of the prior art, according to the above structure provided by the utility model, the technical effects that can be achieved by the utility model are analyzed one by one, including:

[0048] 1. Because the utility model is used for a vacuum induction melting furnace, there is a large pressure difference between the two ends of the rotating shaft, and the vacuum degree must be guaranteed during the melting of the vacuum induction melting furnace, otherwise it will cause working conditions such as substandard products.

[0049] Therefore, the main technical problem solved by the utility model is the shaft sealing, and the second is to provide shaft lubrication. This is different from the prior art cited in the background technology, which mainly solves the technical problem of lubrication and the second is sealing.

[0050] Accordingly, due to the large pressure difference between the two ends of the rotating shaft, the materialized oil caused by the oil injection is a serious safety hazard for the vacuum induction melting furnace. The prior art cited in the background technology and its similar solutions are completely unsuitable for the vacuum induction melting furnace.

[0051] 2. When the pressure difference between the two ends of the seal is large, oil injection can be easily implemented through the pressurizing device, but oil return cannot be achieved due to the pressure difference.

[0052] The prior art cited in the background technology and similar solutions thereof adopt axial oil injection and axial oil return solutions. As mentioned in the first point above, the purpose of the axial oil injection and oil return solution is to spray lubricating oil on the shaft as evenly as possible, which confirms the main purpose of the solution is lubrication.

[0053] The utility model adopts the scheme of radial grease delivery and radial grease extraction, and its main purpose is sealing. Such a design has a large pressure difference at both ends, and the scheme of grease extraction is used to prevent the grease from flowing to the vacuum side.

[0054] 3. The utility model adopts the scheme of radial grease delivery and radial grease extraction. The oil delivery pipe and the oil extraction pipe are preferably collinear to avoid bending loops and to avoid pressure loss during extraction as much as possible.

[0055] Correspondingly, since the rotational friction of the shaft will increase the temperature, it is conducive to extracting the grease, and extracting the grease and replenishing new grease will lower the temperature of the grease and reduce safety hazards.

[0056] 4. The utility model designs an oil extraction device (such as a vacuum pump) to prevent the grease from flowing along the rotating shaft into the vacuum chamber due to the pressure difference.

[0057] 5. As analyzed in point 1 above, the main technical problem to be solved by the present utility model is the shaft seal, and secondly, to provide shaft lubrication, by pumping out the grease and filtering the grease to form a closed-loop circulation of the grease. And, in the preferred embodiment, a pressure sensor is added, by designing a pressure threshold, to avoid the grease flowing into the vacuum chamber due to insufficient pumping pressure. It should be noted that without designing a pressure sensor and maintaining the pumping pressure at a high standard state, it is also possible to avoid the grease flowing into the vacuum chamber, but compared with the embodiment of setting a pressure sensor, it will increase unnecessary energy consumption.

[0058] 6. The first sealing ring of the present utility model needs to contact the shaft or the grease. In order to avoid increasing the friction force, a sealing ring made of fluororubber is designed. The sealing ring made of fluororubber can reduce the friction, lower the adhesion, and can withstand high temperature and corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The drawings of the present utility model are intended to show the general characteristics of the methods, structures, and / or materials used in specific exemplary embodiments of the present utility model, to supplement the description in the specification. However, the drawings of the present utility model are schematic diagrams not drawn to scale, and thus may not be able to accurately reflect the precise structure or performance characteristics of any given embodiment. The drawings of the present utility model should not be construed as limiting or restricting the scope of the values or properties covered by the exemplary embodiments according to the present utility model. The present utility model will be further described in detail below in conjunction with the drawings and the specific embodiments:

[0060] Figure 1 It is a schematic diagram of the usage scenario of the present utility model.

[0061] Figure 2 It is a schematic diagram of the present utility model from a top view angle of the embodiment.

[0062] Figure 3 is Figure 2 The sectional view at the A-A position in

[0063] Description of the reference numerals in the drawings:

[0064] Shaft seal seat A of the vacuum induction melting furnace;

[0065] Vacuum chamber B of the vacuum induction melting furnace;

[0066] Bearing C;

[0067] Shaft D;

[0068] Seat body 1;

[0069] Shaft hole 2;

[0070] First oil passage 3;

[0071] Second oil passage 4;

[0072] Oil pipeline 5;

[0073] Sucker rod 6;

[0074] First accommodation groove 7;

[0075] First sealing ring 8;

[0076] Second accommodation groove 9;

[0077] Second sealing ring 10. Specific implementation mode

[0078] The following describes the implementation mode of the present utility model through specific specific examples. Those skilled in the art can fully understand other advantages and technical effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through different specific implementation modes. The details in this specification can also be applied based on different viewpoints, and various modifications or changes can be made without departing from the overall design concept of the utility model. It should be noted that, without conflict, the following examples and the features in the examples can be combined with each other. The following exemplary embodiments of the present utility model can be implemented in many different forms and should not be construed as being limited only to the specific embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the present utility model is thorough and complete, and the technical solutions of these exemplary specific embodiments are fully conveyed to those skilled in the art. It should be understood that when an element is referred to as being "connected" or "coupled" to another element, the element can be directly connected or coupled to the other element, or there can be an intermediate element. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there is no intermediate element. Throughout the drawings, the same reference numerals always represent the same elements. As used herein, the term "and / or" includes any combination and all combinations of one or more of the associated listed items.

[0079] First embodiment, referring to Figure 1 the shown usage scenario, the vacuum induction melting furnace rotating shaft seal seat A provided by the present utility model is fixed to the outer end face of the bearing C on the side wall of the vacuum cavity B of the vacuum induction melting furnace, and referring to Figure 2 in combination with Figure 3 the shown, it includes:

[0080] A seat body 1, in which a shaft hole 2 is formed at the center, and the shaft hole 2 is for a rotating shaft D to pass through;

[0081] A first oil passage 3, which is formed in a direction perpendicular to the axial direction of the rotating shaft, its inlet is formed on one side of the seat body 1, and its outlet is formed on the inner side wall of the shaft hole 2;

[0082] The second oil passage 4 is formed in a direction perpendicular to the axial direction of the rotating shaft. Its outlet is formed on one side of the seat body 1, and its inlet is formed on the inner side wall of the shaft hole 2.

[0083] The oil delivery pipe 5 is connected to the inlet of the first oil passage 3 and is used to inject lubricating grease into the first oil passage 3.

[0084] The oil suction pipe 6 is connected to the outlet of the second oil passage 4 and is used to extract the lubricating grease.

[0085] The filtering device is connected to the oil suction pipe 6 and is used to filter impurities and gases in the lubricating grease.

[0086] The oil pumping device, such as a vacuum pump, has its inlet connected to the outlet of the filtering device and its outlet connected to the oil delivery pipe 5. It is used to pump out the filtered lubricating grease to avoid the retention of impurities.

[0087] The filling port is connected to the outlet of the oil pumping device and is used to fill the lubricating grease.

[0088] In addition, it should also be understood that although the terms "first", "second", etc. can be used here to describe different elements, components, regions, layers, and / or parts, these elements, components, regions, layers, and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer, or part from another element, component, region, layer, or part. Therefore, without departing from the teachings of the exemplary embodiments of the present invention, the first element, component, region, layer, or part discussed below can also be referred to as the second element, component, region, layer, or part.

[0089] The second embodiment is a further improvement based on the above first embodiment. The same parts will not be described in detail. Continuing to refer to Figure 3 As shown, it further includes:

[0090] A plurality of first accommodation grooves 7 are arranged axially up and down in the shaft hole 2;

[0091] A plurality of first sealing rings 8 are arranged in the first accommodation grooves 7 one by one;

[0092] Among them, the first accommodation grooves 7 are axially closer to the outer end face of the bearing on the side wall of the vacuum chamber of the vacuum induction melting furnace than the first oil passage 3 and the second oil passage 4.

[0093] Optionally, further improving the above second embodiment, it further includes:

[0094] At least one second accommodation groove 9 is formed around the shaft hole 2 between the seat body 1 and the outer end face of the bearing on the side wall of the vacuum chamber of the vacuum induction melting furnace;

[0095] At least one second sealing ring 10 is correspondingly arranged in the second accommodating groove 9.

[0096] Preferably, the first oil passage 3 and the second oil passage 4 in the above first embodiment and the second embodiment are collinear.

[0097] Preferably, the caliber of the inlet of the first oil passage 3 in the above first embodiment and the second embodiment is smaller than the caliber of the outlet of the second oil passage 4.

[0098] The third embodiment is a further improvement based on the above first embodiment or the second embodiment. The same parts will not be described in detail. It further includes:

[0099] A pressure sensor, which is arranged on the inner side wall of the shaft hole 2 and is used to measure the pressure of the lubricating grease in the shaft hole 2. If the detected pressure is less than the first threshold, it sends a first signal to trigger the oil pumping device. If the detected pressure is greater than the second threshold, it sends a second signal to trigger the oil pumping device. The first threshold is less than the second threshold;

[0100] The oil pumping device starts to pump out the lubricating grease when it receives the first signal and stops pumping out the lubricating grease when it receives the second signal.

[0101] Preferably, the first sealing ring 8 in the first embodiment to the third embodiment is made of fluororubber.

[0102] Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present utility model belongs. It will also be understood that terms such as those defined in a general dictionary should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and will not be interpreted in an ideal or overly formal sense unless explicitly defined herein.

[0103] The present utility model has been described in detail above through specific embodiments and examples, but these do not constitute a limitation to the present utility model. Without departing from the principle of the present utility model, those skilled in the art can also make many modifications and improvements, which should also be regarded as the protection scope of the present utility model.

Claims

1. A vacuum induction melting furnace shaft seal seat, which is fixed to the outer end surface of the side wall bearing of the vacuum chamber of the vacuum induction melting furnace, characterized in that: include: The seat body (1) has an axial hole (2) formed at the center thereof, and the axial hole (2) is for the rotating shaft to pass through; A first oil passage (3) is formed in a direction perpendicular to the axial direction of the rotating shaft, an inlet of which is formed on one side of the seat body (1), and an outlet of which is formed on the inner side wall of the shaft hole (2); A second oil passage (4) is formed in a direction perpendicular to the axial direction of the rotating shaft, with its outlet formed on one side of the seat body (1) and its inlet formed on the inner wall of the shaft hole (2); An oil delivery pipe (5), which is connected to the inlet of the first oil circuit (3) and is used to inject lubricating grease into the first oil circuit (3); An oil extraction pipe (6), which is connected to the outlet of the second oil circuit (4) and is used to extract lubricating grease; A filtering device connected to the oil extraction pipe (6) for filtering impurities and gas in the lubricating grease; An oil extraction device, the inlet of which is connected to the outlet of the filtering device, and the outlet of which is connected to the oil delivery pipe (5), and is used to extract the lubricating grease after filtering; The filling port is connected to the outlet of the oil pumping device and is used for filling lubricating grease.

2. The vacuum induction melting furnace shaft sealing seat according to claim 1, characterized in that: Also includes: A plurality of first accommodating grooves (7) are axially arranged vertically in the shaft hole (2); A plurality of first sealing rings (8) are arranged in a one-to-one correspondence in the first accommodating groove (7); The first accommodating groove (7) is axially closer to the outer end surface of the side wall bearing of the vacuum chamber of the vacuum induction melting furnace than the first oil passage (3) and the second oil passage (4).

3. The vacuum induction melting furnace shaft seal seat according to claim 2, characterized in that: Also includes: At least one second accommodating groove (9) is formed around the axial hole (2) between the seat body (1) and the outer end surface of the bearing on the side wall of the vacuum chamber of the vacuum induction melting furnace; At least one second sealing ring (10) is correspondingly arranged in the second accommodating groove (9).

4. The vacuum induction melting furnace shaft sealing seat according to claim 1, characterized in that: The first oil circuit (3) and the second oil circuit (4) are collinear.

5. The vacuum induction melting furnace shaft sealing seat according to claim 1, characterized in that: The diameter of the inlet of the first oil passage (3) is smaller than the diameter of the outlet of the second oil passage (4).

6. The vacuum induction melting furnace shaft seal seat according to claim 1, characterized in that: Also includes: A pressure sensor is arranged on the inner wall of the shaft hole (2) and is used to measure the lubricating grease pressure in the shaft hole (2). If the detected pressure is less than a first threshold, a first signal is sent to trigger the oil pumping device. If the detected pressure is greater than a second threshold, a second signal is sent to trigger the oil pumping device. The first threshold is less than the second threshold. The oil extraction device starts to extract the lubricating grease upon receiving the first signal, and stops to extract the lubricating grease upon receiving the second signal.

7. The vacuum induction melting furnace shaft sealing seat according to claim 3, characterized in that: The first sealing ring (8) is made of fluorinated rubber.

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