Atmosphere gas outlet mechanism of pit type nitriding furnace

Abstract

The utility model relates to the technical field of nitriding furnaces, in particular to a pit type nitriding furnace atmosphere gas outlet mechanism which comprises an air guide barrel and a muffle, the air guide barrel is installed in the muffle, a first gas outlet pipe and a second gas outlet pipe are arranged in the air guide barrel and the muffle respectively, a plurality of first gas outlets are formed in the first gas outlet pipe, and a plurality of second gas outlets are formed in the second gas outlet pipe. The bottom end of the first air outlet pipe is provided with a first air outlet, the bottom end of the second air outlet pipe is provided with a second air outlet, the first air outlets are uniformly distributed according to the length of the air guide barrel, the second air outlet is arranged at the bottom of the muffle, and the first air outlet pipe is arranged in the air guide barrel and provided with a plurality of first air outlets which are uniformly distributed along the air guide barrel; and the atmosphere gas can uniformly and quickly enter the muffle, so that the product quality is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of nitriding furnaces, and in particular to an atmosphere gas outlet mechanism of a pit-type nitriding furnace. Background Art

[0002] Nitriding is a key process to improve the wear resistance of the workpiece surface. Existing gas nitriding equipment includes pit-type nitriding furnace, box-type nitriding furnace, etc. Among them, the pit-type nitriding furnace is a commonly used gas nitriding equipment for carbon steel parts. The uniformity of nitriding and the cooling rate after the nitriding process are important performance indicators for measuring the pit-type nitriding furnace, which reflects the quality and processing efficiency of the workpiece after nitriding treatment.

[0003] The gas outlet of the existing pit-type nitriding furnace is generally arranged at the top of the furnace body, which results in that when the atmosphere gas is filled in, the atmosphere gas cannot fill the furnace body quickly and evenly, and the quality of the product will be reduced due to the atmosphere gas in the furnace. Utility Model Content

[0004] The technical problem to be solved by the present application is to provide an atmosphere gas outlet mechanism for a pit-type nitriding furnace, and to arrange multiple outlets in the muffle to solve the problem of uneven atmosphere gas in the furnace body.

[0005] In order to solve the above problems, the following technical solutions are provided:

[0006] The pit-type nitriding furnace atmosphere gas outlet mechanism of the present scheme includes an air duct and a muffle. The air duct is installed in the muffle. The air duct and the muffle are respectively provided with a first air outlet pipe and a second air outlet pipe. The first air outlet pipe is provided with a plurality of first air outlets. The bottom end of the second air outlet pipe is provided with a second air outlet. The first air outlets are evenly distributed according to the length of the air duct, and the second air outlet is provided at the bottom of the muffle.

[0007] By adopting the above technical solution: a first air outlet pipe is provided in the air guide tube, a plurality of first air outlets are provided on the first air outlet pipe, and the first air outlets are evenly distributed along the air guide tube, thereby ensuring that the atmosphere gas can enter the muffle evenly and quickly, thereby ensuring product quality.

[0008] The first air outlet and the second air outlet are respectively connected to the first air duct and the second air duct, both of which are annular. The first air duct is fixedly connected to the inner wall of the air guide tube, and the air duct on the second air outlet is fixedly connected to the bottom wall of the muffle.

[0009] By adopting the above technical solution: the first gas guide pipe and the second gas guide pipe are both designed to be annular, which is convenient for placing the workpiece on the one hand, and on the other hand, it is convenient for the gas to be evenly dispersed on any radial plane, further improving the uniformity of gas filling into the furnace body.

[0010] A first locking piece for mounting the first air guide tube is arranged on the inner wall of the air guide tube, and air outlet holes are arranged on the inner sides of the first air guide tube and the second air guide tube.

[0011] The first air guide tube and the second air guide tube are evenly distributed according to the depth of the muffle.

[0012] By adopting the above technical solution, all the air guide pipes in the furnace body can be evenly distributed, thereby improving the uniformity of the atmosphere gas.

[0013] The above solution has the following advantages:

[0014] 1. In the present application, a first air outlet pipe is provided in the air guide tube, and a plurality of first air outlets are provided on the first air outlet pipe. The first air outlets are evenly distributed along the air guide tube to ensure that the atmosphere gas can enter the muffle evenly and quickly, thereby ensuring product quality.

[0015] 2. In the present application, the first gas guide tube and the second gas guide tube are designed to be annular, which is convenient for the placement of the workpiece on the one hand, and on the other hand, it is convenient for the gas to be evenly dispersed on any radial plane, further improving the uniformity of gas filling into the furnace body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the atmosphere gas outlet mechanism of the pit-type nitriding furnace of the present application.

[0017] Figure numerals: 1. muffle; 2. air guide tube; 3. first air outlet pipe; 31. first air guide pipe; 4. second air outlet pipe; 41. second air guide pipe. DETAILED DESCRIPTION

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

[0019] Example

[0020] The atmosphere gas outlet mechanism of the pit type nitriding furnace of this embodiment is as follows: Figure 1 As shown, it includes an air guide tube 2 and a muffle 1. The air guide tube 2 is installed in the muffle 1 through a tripod. The air guide tube 2 and the muffle 1 are respectively provided with a first air outlet pipe 3 and a second air outlet pipe 4. The first air outlet pipe 3 is provided with a plurality of first air outlets. The bottom end of the second air outlet pipe 4 is provided with a second air outlet. The first air outlets are evenly distributed according to the length of the air guide tube 2. The second air outlet is arranged at the bottom of the muffle 1. The air guide tube 2 is provided with a first air outlet pipe 3. The first air outlet pipe 3 is provided with a plurality of first air outlets. The first air outlets are evenly distributed along the air guide tube 2, so as to ensure that the atmosphere gas can evenly enter the furnace body of the muffle 1, and ensure that the concentration of the atmosphere gas at each position in the muffle is approximately equal, thereby improving the product quality.

[0021] Furthermore, the first air outlet and the second air outlet of the present embodiment are respectively connected with the first air guide pipe 31 and the second air guide pipe 41, wherein the first air guide pipe 31 is fixedly connected to the annular inner wall of the air guide cylinder 2, and the air guide pipe on the second air outlet pipe 4 is fixedly connected to the circular bottom wall of the muffle 1, and the first air guide pipe 31 and the second air guide pipe 41 are both annular so as to fit with the inner wall of the guide cylinder and the muffle 1 respectively, so as to avoid interference with the workpiece placed in the guide cylinder. It can be seen that the first air guide pipe 31 and the second air guide pipe 41 are both designed to be annular, which is convenient for the placement of the workpiece on the one hand, and is convenient for the gas to be evenly dispersed on any radial plane on the other hand, further improving the uniformity of the gas filling into the furnace body.

[0022] Specifically, a first locking piece for mounting the first air guide tube 31 is provided on the inner wall of the air guide tube 2, and air outlet holes are provided on the inner sides of the first air guide tube 31 and the second air guide tube 41. Figure 1 As shown, the first conduit is installed on the inner wall of the guide tube through at least three sets of first locking sheets, and the air outlet holes are evenly opened on the inner wall of the annular air guide tube to ensure that the uniformity of the atmosphere gas from all directions of the air guide tube is the same.

[0023] Furthermore, in this embodiment, the first air outlet and the second air outlet are evenly distributed according to the depth of the muffle 1 so that all the air ducts in the furnace body can be evenly distributed, avoiding that there is a place where the first air duct 31 and the second air duct 41 are close to each other, which increases the concentration of the atmosphere gas at that place, which is not conducive to controlling the uniformity of the atmosphere gas.

[0024] The present invention is described above in conjunction with specific implementation methods, but those skilled in the art should be aware that these descriptions are exemplary and are not limitations on the scope of protection of the present invention, and that those skilled in the art can make various variations and modifications to the present invention based on the spirit and principles of the present invention, and these variations and modifications are also within the scope of the present invention.

Claims

1. A gas outlet mechanism for atmosphere of a pit-type nitriding furnace, comprising an air guide tube (2) and a muffle (1), wherein the air guide tube (2) is installed in the muffle (1), and is characterized in that: A first air outlet pipe (3) and a second air outlet pipe (4) are respectively provided in the air guide tube (2) and the muffle (1); a plurality of first air outlets are provided on the first air outlet pipe (3); a second air outlet is provided at the bottom end of the second air outlet pipe (4); the first air outlets are evenly distributed according to the length of the air guide tube (2); and the second air outlet is provided at the bottom of the muffle (1).

2. The pit-type nitriding furnace atmosphere gas outlet mechanism according to claim 1, characterized in that: The first air outlet and the second air outlet are respectively connected to a first air duct (31) and a second air duct (41); the first air duct (31) and the second air duct (41) are both annular; the first air duct (31) is fixedly connected to the inner wall of the air guide cylinder (2); and the air duct on the second air outlet (4) is fixedly connected to the bottom wall of the muffle (1).

3. The pit-type nitriding furnace atmosphere gas outlet mechanism according to claim 2, characterized in that: A first locking piece for mounting the first air guide tube (31) is provided on the inner wall of the air guide tube (2), and air outlet holes are provided on the inner sides of the first air guide tube (31) and the second air guide tube (41).

4. The pit-type nitriding furnace atmosphere gas outlet mechanism according to claim 2, characterized in that: The first air guide pipe (31) and the second air guide pipe (41) are evenly distributed according to the depth of the muffle (1).

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