Dry filter of vacuum degassing furnace

Abstract

The utility model discloses a dry filter of a vacuum degassing furnace, which comprises a filter body and a filter body support used for supporting the filter body, the filter body is provided with an air inlet and an air outlet, and filter elements arranged in an array are arranged in a cavity of the filter body; a filter cover is arranged at the top of the filter body, a vent hole is formed in the filter cover, and a pulse valve is connected to the vent hole. The dry type filter of the vacuum degassing furnace can adsorb solid particle pollutants in air flow, ensures the vacuum environment of a smelting chamber, and can deposit, sweep and discharge the adsorbed particle pollutants in real time. The filtering device has a good filtering effect, and can ensure that the filtering effect is stable and reliable after long-time work.

Description

Technical Field

[0001] The utility model relates to a vacuum degassing furnace dry filter used in the field of vacuum degassing furnaces. Background Art

[0002] With the rapid development of modern industry, people have higher and higher requirements for the use of mechanical parts. The increasingly harsh use environment has put forward requirements for the high temperature resistance, wear resistance, fatigue resistance and other properties of metal materials. For certain specific metal or alloy materials, whether it is early research and development or later mass production and use, research or obtaining high-performance metal alloy materials requires the support of metal smelting equipment, surface heat treatment equipment, etc. Among the many special heating or smelting methods, induction heating technology plays a vital role in the smelting and preparation of metal materials.

[0003] The vacuum degassing furnace melts solid metal by induction in the atmosphere, and degasses the molten metal in a vacuum state during the refining stage; the liquid metal is cast under the atmosphere or under the protection of inert gas. To achieve vacuum degassing of the furnace, the entire furnace shell is made into a completely closed form, and a sealing flange is designed on the top of the furnace body. After the smelting in the atmosphere is completed, the water-cooled upper cover is moved to the top of the furnace by a crane or a special lifting / rotating device (optional); the water-cooled upper cover is directly connected to the multi-stage mechanical vacuum pump system, which can directly degas the metal pool. The induction coil is equipped with a power supply with matching power and frequency. This power supply can achieve both efficient melting rate (improve productivity) and optimal stirring of liquid metal (improve metallurgical quality); the appropriate stirring frequency ensures both uniform stirring of the alloy and sufficient ventilation of the tumbling liquid metal. Once the air in the furnace is evacuated, the degassing process and the enhanced carbon-oxygen reaction will help remove harmful gas components, so the hydrogen, ammonia and oxygen content are much lower than that of the metal refined under the atmosphere. After degassing is completed, the upper cover of the furnace is removed and a protective cover is placed on the top sealing flange. Then the furnace can be tilted under the atmosphere to pour the molten steel into the launder or mold. Usually the casting process is completed under the atmosphere (it can also be cast under a protective atmosphere).

[0004] The vacuum degassing furnace is a very important and irreplaceable equipment for smelting and producing high-quality alloy steel. The vacuum system is a crucial system in the complete set of vacuum degassing furnace equipment. The optimization and cleaning of the vacuum system is an indispensable and important part of the vacuum furnace engineering design, and it is also the main research direction for improving the vacuum melting system's pumping performance and production efficiency.

[0005] However, the current vacuum equipment system is too simple and crude, and the process control and sensor detection methods are simple, so the vacuum system has various disadvantages: vacuum pumps and vacuum valves are easily contaminated, have a high failure rate, and have a short service life. In particular, the dry filter is an important part of the vacuum system, and the existing dry filter inlet and outlet are at the same height. After absorbing particulate pollutants in the air flow for a long time, it will cause the filter screen to be blocked, greatly reducing the effect of removing pollutants. Reasonable dry filter design is extremely critical. How to improve its design level and ensure the filtering effect is the main goal of technicians. Utility Model Content

[0006] The utility model aims to overcome the defects of the prior art and provide a vacuum degassing furnace dry filter.

[0007] The technical solution to achieve the above object is:. A vacuum degassing furnace dry filter, comprising a filter body and a filter body support for supporting the filter body;

[0008] The filter body is provided with an air inlet and an air outlet, and the cavity of the filter body is provided with filter elements arranged in an array;

[0009] A filter cover is arranged on the top of the filter body, a vent hole is opened on the filter cover, and a pulse valve is connected to the vent hole.

[0010] Furthermore, the bottom of the filter body is a conical structure, and a discharge port is provided at the bottom of the conical structure.

[0011] Furthermore, a vacuum isolation valve is provided at the discharge port.

[0012] Furthermore, the air inlet is located below the filter body, and the air outlet is located above the filter body.

[0013] Furthermore, the filter element is detachably fixed in the cavity of the filter body.

[0014] Furthermore, at least two vents are provided on the filter cover, each vent is respectively connected to a pulse valve, and the pulse valve is connected to an external purge air inlet pipe.

[0015] The vacuum degassing furnace dry filter of the utility model adopts the air inlet at the bottom and the air outlet at the top. When the system is running, the solid particle pollutants in the airflow will pass through the multi-stage filter element, and the pollutants in the airflow can be fully absorbed to ensure the vacuum environment of the smelting chamber; due to the effect of gravity, the heavier particles will directly sink to the bottom and accumulate at the bottom of the filter body. The bottom is designed with a discharge port to discharge the deposits; the deposits adhering to the filter element are purged through the pulse valve, so that the deposits adhering to the filter element directly sink to the bottom of the filter body. The utility model has a good filtering effect and can ensure that the filtering effect is stable and reliable after long-term operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view of a vacuum degassing furnace dry filter of the utility model;

[0017] Figure 2 The utility model is a top view of a vacuum degassing furnace dry filter. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solution of the utility model, the specific implementation method thereof is described in detail below in conjunction with the accompanying drawings:

[0019] See also Figure 1 The utility model discloses a vacuum degassing furnace dry filter, which comprises a filter body 1, a filter cover 2, a filter support 3, a filter element 4 and a pulse valve 5.

[0020] The filter support 3 supports the filter body 1. The filter support 3 includes a set of two support bodies, which are symmetrically supported on both sides of the bottom of the conical structure of the filter body 1, and a working space is reserved for operating the discharge port opened at the bottom of the conical structure. A vacuum isolation valve is provided at the discharge port.

[0021] The filter body 1 is provided with an air inlet and an air outlet, the air inlet is located below the filter body, and the air outlet is located above the filter body. An array of filter elements 4 are arranged in the cavity of the filter body; the filter element 4 is detachably fixed in the cavity of the filter body.

[0022] A filter cover 2 is provided on the top of the filter body 1. The filter cover 2 is provided with at least two vents, and the vents are connected with a pulse valve 5. The pulse valve is connected to an external purge air intake pipeline.

[0023] After the vacuum degassing furnace dry filter of the utility model is connected to the vacuum system of the vacuum degassing furnace, the solid particles in the air flow enter the filter body 1 through the air inlet below the filter body 1, pass through the multi-stage filter element 4, and are adsorbed on the filter element 4. Due to the multi-stage filtration, the solid particles in the air flow are filtered out in this link as much as possible. Then the filter element 4 is pulse-purged through the pulse valve 5, so that the particles adhering to the filter element 4 are blown off and fall on the bottom of the filter body 1. Through the quick discharge port at the bottom of the filter body 1, the deposits can be directly discharged.

[0024] In summary, in the vacuum degassing furnace dry filter of the utility model, when the vacuum system is running, the solid particle pollutants in the airflow will be filtered through the multi-stage filter element. Due to the effect of gravity, the heavier particles will sink directly to the bottom and accumulate at the bottom of the filter body; then the pulse valve will be used for blowing to blow most of the particles adsorbed by the filter element downward to the bottom, which can ensure the cleanliness of the filter element and the long-term filtering effect, so that the pollutants in the airflow in the vacuum pipeline can be fully adsorbed and then enter the next vacuum device through the air outlet above the filter body. The structural design of the air inlet and air outlet with a height difference can make it possible to prevent particles from being attached to the derived airflow as much as possible, thereby achieving the preset vacuum degree of the smelting chamber.

[0025] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A vacuum degassing furnace dry filter, comprising a filter body and a filter body support for supporting the filter body, characterized in that: The filter body is provided with an air inlet and an air outlet, and the cavity of the filter body is provided with filter elements arranged in an array; A filter cover is arranged on the top of the filter body, a vent hole is opened on the filter cover, and a pulse valve is connected to the vent hole.

2. A vacuum degassing furnace dry filter according to claim 1, characterized in that: The bottom of the filter body is a conical structure, and a discharge port is opened at the bottom of the conical structure.

3. A vacuum degassing furnace dry filter according to claim 2, characterized in that: A vacuum isolation valve is provided at the discharge port.

4. A vacuum degassing furnace dry filter according to claim 1, characterized in that: The air inlet is located below the filter body, and the air outlet is located above the filter body.

5. The vacuum degassing furnace dry filter according to claim 1, characterized in that: The filter element is detachably fixed in the cavity of the filter body.

6. A vacuum degassing furnace dry filter according to claim 1, characterized in that: At least two vents are arranged on the filter cover, each vent is respectively connected to a pulse valve, and the pulse valve is connected to an external purge air inlet pipeline.

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