A pre-evacuated atmosphere protected pit-type heating furnace

Abstract

The utility model discloses a kind of pre-evacuation atmosphere protection well type heating furnace, it is related to industrial heat treatment equipment technical field, including vacuum furnace tank, vacuum furnace tank is equipped with the vacuumizing device for extracting the air inside furnace tank, vacuum furnace tank is equipped with the nitrogen filling device for atmosphere protection, vacuum furnace tank is equipped with the electric heating device for intensifying heat exchange in furnace, vacuum furnace tank is equipped with the furnace lining for heat preservation of furnace tank, vacuum furnace tank is equipped with the hearth quick cooling air circulation system for cooling inside furnace tank. The utility model high-resistance alloy strip adopts hanging structure, radiation efficiency is high, intensifies heat exchange in furnace, improves furnace thermal efficiency, furnace lining is gapless whole, reaches perfect heat storage effect, and anchor sets in furnace body cold face, substantially improves the efficiency of heat preservation, so that furnace temperature uniformity is higher.

Description

Technical Field

[0001] This utility model relates to the field of industrial heat treatment equipment technology, and in particular to a pre-vacuum atmosphere protected well-type heating furnace. Background Technology

[0002] A pit furnace is an industrial heating device widely used in the heat treatment of metal materials. Its name comes from its vertical cylindrical furnace body structure, which resembles a deep well.

[0003] Traditional pit furnaces often use independent furnace tank structures, which have problems such as poor furnace temperature uniformity and insufficient cooling efficiency, making it difficult to meet the usage requirements of the equipment. Utility Model Content

[0004] The purpose of this invention is to solve the problems of poor furnace temperature uniformity and insufficient cooling efficiency in the existing technology, and to propose a pre-vacuum atmosphere protected well-type heating furnace.

[0005] To address the problems existing in the prior art, the present invention adopts the following technical solution:

[0006] A pre-vacuum atmosphere-protected well-type heating furnace includes a vacuum furnace tank, which is welded from a furnace shell steel plate and has a heating chamber directly formed inside. A furnace tank cover is detachably installed on the vacuum furnace tank, and the furnace tank cover consists of a panel, a heat insulation box, an exhaust pipe, and an inlet pipe. A furnace body steel frame is fixedly installed on the vacuum furnace tank. The vacuum furnace tank is equipped with a vacuum pumping device for extracting air from inside the tank, a nitrogen-filling device for atmosphere protection, an electric heating device for enhancing heat exchange within the furnace, a furnace lining for heat preservation, and a furnace rapid cooling air circulation system for cooling the interior of the tank.

[0007] Preferably, the vacuuming device includes a vacuum pump, a valve, a vacuum pipe, and a vacuum pressure gauge. One end of the vacuum pipe is connected to the vacuum pump, and the other end of the vacuum pipe is connected to the vacuum furnace. The valve and the vacuum pressure gauge are both installed on the vacuum pipe.

[0008] Preferably, the nitrogen filling device includes an inlet pipe, a flow meter, and a control valve assembly. The inlet pipe is installed on the vacuum furnace tank, and the flow meter and control valve assembly are both installed on the inlet pipe.

[0009] Preferably, the electric heating device comprises a high-resistance alloy strip.

[0010] Preferably, the furnace lining is made of all-fiber material.

[0011] Preferably, the furnace rapid cooling air circulation system includes multiple air ducts, a main exhaust pipe, and a powerful cooling fan.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. In this utility model, the high resistance alloy strip adopts a hanging structure, which has high radiation efficiency, enhances heat exchange in the furnace, improves the furnace thermal efficiency, and the furnace lining is a seamless whole to achieve a good heat storage effect. In addition, the anchors are set on the cold surface of the furnace body, which greatly improves the heat preservation efficiency and makes the furnace temperature uniformity high.

[0014] 2. In this utility model, the furnace rapid cooling air circulation system uses ambient air outside the furnace as the medium. The cold air is sent into the furnace from the branch pipes at the bottom of the furnace by a strong cooling fan. The air outlet is arranged at the bottom of the furnace. The branch pipes send the hot air into the main exhaust pipe and then discharge it outside the workshop, which makes the cooling efficiency of the device high. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0016] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0017] Figure 2 For the present utility model Figure 1 Enlarged view of point A in the middle;

[0018] Figure 3 For the present utility model Figure 1 Enlarged diagram of point B in the middle.

[0019] The numbers in the diagram are: 1. Vacuum furnace; 2. Furnace lid; 3. Vacuum pumping device; 4. Nitrogen filling device; 5. Electric heating device; 6. Furnace lining; 7. Furnace rapid cooling air circulation system; 8. Furnace body steel frame. Detailed Implementation

[0020] 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.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Example: This example provides a pre-vacuum atmosphere protected pit-type heating furnace, see [link / reference]. Figure 1-3 Specifically, it includes a vacuum furnace 1, which is welded from a furnace shell steel plate and has a heating chamber directly inside. A furnace cover 2 is detachably installed on the vacuum furnace 1. The furnace cover 2 consists of a panel, a heat insulation box, an exhaust pipe, and an air inlet pipe. A furnace body steel frame 8 is fixedly installed on the vacuum furnace 1. A vacuum pumping device 3 is installed on the vacuum furnace 1 to extract the air inside the furnace. A nitrogen filling device 4 is installed on the vacuum furnace 1 for atmosphere protection. An electric heating device 5 is installed on the vacuum furnace 1 to enhance the heat exchange inside the furnace. A furnace lining 6 is installed on the vacuum furnace 1 for furnace insulation. A furnace rapid cooling air circulation system 7 is installed on the vacuum furnace 1 for cooling the inside of the furnace.

[0023] In this optional embodiment, the material is placed in the vacuum furnace 1, the furnace lid 2 is closed, the vacuum pumping device 3 evacuates the inside of the vacuum furnace 1 to a vacuum, the nitrogen filling device 4 introduces nitrogen into the vacuum furnace 1 to provide atmosphere protection for the inside of the vacuum furnace 1, the electric heating device 5 enhances the heat exchange inside the furnace, so that the temperature inside the vacuum furnace 1 rises rapidly, the furnace lining 6 serves to keep the vacuum furnace 1 warm, allowing the material inside the vacuum furnace 1 to undergo heat treatment to improve its mechanical, physical and chemical properties, after the heat treatment is completed, the furnace rapid cooling air circulation system 7 quickly lowers the temperature inside the vacuum furnace 1 to force-cool the material;

[0024] Optionally, the vacuum device 3 includes a vacuum pump, a valve, a vacuum pipe and a vacuum pressure gauge. One end of the vacuum pipe is connected to the vacuum pump and the other end of the vacuum pipe is connected to the vacuum furnace 1. The valve and the vacuum pressure gauge are both installed on the vacuum pipe.

[0025] In this optional embodiment, the valve is opened, and the vacuum pump evacuates the vacuum furnace 1 through the evacuation pipe. The vacuum pressure gauge is observed until the vacuum furnace 1 is evacuated to a vacuum.

[0026] Optionally, the nitrogen filling device 4 includes an inlet pipe, a flow meter, and a control valve assembly. The inlet pipe is installed on the vacuum furnace tank 1, and the flow meter and control valve assembly are both installed on the inlet pipe.

[0027] In this optional embodiment, the inlet pipe is connected to an external nitrogen source. The inlet pipe enters the furnace tank from the upper opening and moves down along the side wall to a position close to the bottom of the furnace. Nitrogen enters the tank through the inlet pipe and rises slowly inside the tank to achieve the best uniformity effect inside the tank.

[0028] Optionally, the electric heating device 5 includes a high-resistance alloy strip;

[0029] In this optional embodiment, the high-resistance alloy strip adopts a hanging structure, which has high radiation efficiency, enhances heat exchange in the furnace, improves furnace thermal efficiency, and extends the service life of the heating element.

[0030] Optionally, the furnace lining 6 is made of all-fiber material;

[0031] In this optional embodiment, during manufacturing, specialized equipment is used to compress the fiber blanket into multiple large folded fiber panels at a ratio of 230 kg / m³, according to the furnace size. A certain amount of compression is left during the processing to ensure that after the furnace is built, each large folded fiber panel expands in different directions, causing the large folded fiber panels to be squeezed together into a seamless whole, achieving a good heat storage effect. Furthermore, the anchors are set on the cold surface of the furnace body to improve the high temperature resistance of the fibers and significantly improve the heat preservation efficiency.

[0032] Optionally, the furnace rapid cooling air circulation system 7 includes multiple air ducts, a main exhaust pipe, and a forced cooling fan;

[0033] In this optional embodiment, the furnace rapid cooling air circulation system 7 uses ambient air outside the furnace as the medium. The cold air is sent into the furnace from the branch pipes at the bottom of the furnace by a strong cooling fan. The air outlet is arranged at the bottom of the furnace. The branch pipes send the hot air into the main exhaust pipe and then discharge it outside the workshop.

[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A pre-vacuum atmosphere protected well-type heating furnace, comprising a vacuum furnace tank (1), characterized in that: The vacuum furnace (1) is welded from a furnace shell steel plate, and a heating chamber is directly formed inside. The furnace lid (2) is detachably installed on the vacuum furnace (1). The furnace lid (2) consists of a panel, a heat insulation box, an exhaust pipe and an air inlet pipe. A furnace body steel frame (8) is fixedly installed on the vacuum furnace (1). A vacuum pumping device (3) is provided on the vacuum furnace (1) for extracting air from the furnace. A nitrogen filling device (4) is provided on the vacuum furnace (1) for atmosphere protection. An electric heating device (5) is provided on the vacuum furnace (1) for enhancing heat exchange inside the furnace. A furnace lining (6) is provided on the vacuum furnace (1) for furnace insulation. A furnace rapid cooling air circulation system (7) is provided on the vacuum furnace (1) for cooling the furnace interior.

2. The pre-vacuum atmosphere protected well-type heating furnace according to claim 1, characterized in that: The vacuum pumping device (3) includes a vacuum pump, a valve, a vacuum pipe and a vacuum pressure gauge. One end of the vacuum pipe is connected to the vacuum pump and the other end of the vacuum pipe is connected to the vacuum furnace (1). The valve and the vacuum pressure gauge are both installed on the vacuum pipe.

3. The pre-vacuum atmosphere protected well-type heating furnace according to claim 1, characterized in that: The nitrogen filling device (4) includes an inlet pipe, a flow meter and a control valve group. The inlet pipe is installed on the vacuum furnace tank (1), and the flow meter and the control valve group are both installed on the inlet pipe.

4. A pre-vacuum atmosphere protected well-type heating furnace according to claim 1, characterized in that: The electric heating device (5) includes a high-resistance alloy strip.

5. A pre-vacuum atmosphere protected well-type heating furnace according to claim 1, characterized in that: The furnace lining (6) is made of all-fiber material.

6. A pre-vacuum atmosphere protected well-type heating furnace according to claim 1, characterized in that: The furnace rapid cooling air circulation system (7) includes multiple air ducts, a main exhaust pipe and a strong cooling fan.

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