Detachable air quenching air return device

Abstract

The utility model discloses a detachable air quenching air return device which comprises a hot area shell, a hot area heat preservation layer installed on the inner wall of the hot area shell, an air return opening formed in the rear wall of the hot area shell and a hatch cover covering the air return opening. The air return window further comprises an air return window frame, hinge pieces and a protection plate. The air return window frame is detachably installed on the outer wall of the hot area shell, and an air return flaring communicated with the air return opening is formed in the air return window frame. The hatch cover is hinged to the air return window frame through a hinge piece, so that the hatch cover is embedded in the air return flaring in a sealed mode and seals the air return opening. And the protective plate covers the hot area insulating layer around the return air inlet, so that the hot area insulating layer around the return air inlet is isolated from the gas quenching high-pressure gas through the protective plate. The utility model relates to the technical field of vacuum furnaces, and can solve the problems that in the prior art, the air return port is poor in sealing performance, and a thermal insulation layer of a rear wall of a hot area is prone to local erosion.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum furnaces, in particular to a detachable gas quenching return air device. Background Art

[0002] High-pressure gas quenching in vacuum heat treatment is the core process for heat-treated workpieces to achieve ideal hardness and organizational structure. In a gas quenching furnace without external force driving the graphite hot zone, high-pressure gas enters through the air inlets around the hot zone and is discharged from the return air outlet at the back of the hot zone. The hatch at the return air outlet of the hot zone must be kept closed when the equipment is heated to minimize heat loss, while ensuring that it can be opened in time during gas quenching and ensuring as much gas flow as possible, and also taking into account the convenience of maintenance after repeated flushing of high-pressure gas quenching gas.

[0003] A straight hole is opened in the rear wall of the hot zone shell as a return air outlet, and the hatch cover is controlled by the cylinder to descend and cover the return air outlet. However, there is inevitably a gap between the hatch cover and the return air outlet. During the heating process, heat is easily lost to the outside through the gap, causing the furnace temperature at the return air outlet to be low, affecting the uniformity of the furnace temperature.

[0004] In addition, when gas quenching cooling is required, high-pressure gas passes through the return air port and repeatedly flushes the surface of the insulation layer around the return air port on the rear wall of the hot zone, causing local erosion of the insulation layer on the rear wall of the hot zone. However, the insulation layer needs to be replaced as a whole, which is very expensive. Therefore, it is necessary to provide a detachable gas quenching return air device that can solve the problems of poor sealing at the return air port and easy local erosion of the insulation layer on the rear wall of the hot zone in the prior art. Summary of the invention

[0005] The utility model aims to provide a detachable gas quenching return air device, which can solve the problems of poor sealing at the return air outlet and easy local erosion of the thermal insulation layer of the rear wall of the hot zone in the prior art.

[0006] The utility model is achieved in this way:

[0007] A detachable gas quenching return air device comprises a hot zone shell, a hot zone insulation layer installed on the inner wall of the hot zone shell, a return air port formed on the rear wall of the hot zone shell, and a hatch covering the return air port;

[0008] The detachable gas quenching return air device also includes a return air window frame, a hinge and a protective plate; the return air window frame is detachably installed on the outer wall of the hot zone shell, and a return air expansion port connected to the return air port is formed on the return air window frame; the hatch cover is hinged to the return air window frame through the hinge, so that the hatch cover is sealed and embedded in the return air expansion port and closes the return air port; the protective plate is covered and installed on the hot zone insulation layer located around the return air port, so that the hot zone insulation layer located around the return air port is isolated from the gas quenching high-pressure gas through the protective plate.

[0009] A return air outlet insulation layer is detachably embedded in the return air window frame.

[0010] The return air expansion port is a trumpet-shaped structure with a small inside and a large outside. The size of the small end of the return air expansion port is consistent with the size of the return air port, so that the small end of the return air expansion port is connected to the inside of the hot zone shell through the return air port; the hatch cover seal is embedded at the large end of the return air expansion port.

[0011] The inner wall of the hatch cover is formed with a hatch cover convex portion matching the large end of the return air expansion port, and the hatch cover convex portion is matched and embedded in the large end of the return air expansion port, so that the hatch cover seals the return air expansion port and the return air port.

[0012] The hatch cover and the hatch cover convex part are detachably embedded with a hatch cover insulation layer.

[0013] A counterweight is provided at the bottom of the hatch cover.

[0014] The hinged part includes a hinge and a bushing. A first hinged part is provided on the top of the return air window frame, and a second hinged part is provided on the top of the hatch cover. The first hinged part is rotatably hinged with the second hinged part via the hinge and the bushing, so that the hatch cover can be rotatably opened and closed and embedded in the return air expansion port.

[0015] A plurality of return air outlet fixing blocks are arranged on the outer wall of the rear wall of the hot zone shell at intervals outside the return air outlet, and the return air window frame is installed on the plurality of return air outlet fixing blocks, so that the return air window frame is fixedly installed at the return air outlet of the hot zone shell.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The utility model is provided with a return air window frame and a hinged member. The return air window frame is sealed and installed at the return air inlet of the rear wall of the hot zone shell. The hatch cover is rotatably hinged to the return air window frame through the hinged member. When the hatch cover is rotated inwardly to be closed, the convex part of the hatch cover can be matched and embedded in the return air expansion port to ensure the sealing of the return air expansion port, reduce the heat loss at the return air inlet, ensure the uniformity of the furnace temperature, and the hatch cover is flexible to open and close. It can be rotated and opened in time under the action of internal pressure during gas quenching to ensure the quenching function without arranging a cylinder.

[0018] 2. The utility model is provided with a return air window frame and a hatch cover. The return air window frame is provided with a return air expansion port which is small inside and large outside and is connected to the return air port. This is beneficial for quickly guiding the gas in the hot zone shell to be discharged outward, accelerating the cooling speed inside the hot zone shell, and the small inside and large outside structure can ensure the effective sealing of the return air expansion port when the hatch cover rotates relatively under the action of its own weight and counterweight, avoiding the existence of gaps and causing heat loss.

[0019] 3. The utility model is provided with a protective plate, which can cover and protect the hot zone insulation layer around the return air outlet, avoiding frequent local scouring of the hot zone insulation layer around the return air outlet when the high-pressure gas quenching gas is discharged. The protective plate can be replaced separately after scouring and erosion, avoiding the overall replacement of the hot zone insulation layer and reducing the equipment maintenance cost.

[0020] 4. The utility model is provided with a hatch cover insulation layer and a return air outlet insulation layer, which can improve the insulation performance at the return air outlet, reduce heat loss and heating energy consumption, ensure the uniformity of furnace temperature, and adopts a detachable installation as a whole, which is convenient and quick to disassemble and assemble. During maintenance, only the hatch cover insulation layer, the return air outlet insulation layer and the protective plate need to be replaced, which has low maintenance cost and high convenience, and short maintenance downtime. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a cross-sectional view of the hatch cover of the detachable gas quenching return air device of the utility model being closed;

[0022] Figure 2 The utility model is a cross-sectional view of a detachable gas quenching and air return device with its hatch cover opened.

[0023] In the figure, 1 is a hot zone shell, 101 is a return air outlet, 2 is a return air window frame, 201 is a return air expansion port, 202 is a first hinged joint, 3 is a hatch cover, 301 is a second hinged joint, 4 is a first mounting member, 5 is a hatch cover insulation layer, 6 is a second mounting member, 7 is a hinge, 8 is a bushing, 9 is a hot zone insulation layer, 10 is a mounting bolt, 11 is a counterweight, 12 is a third mounting member, 13 is a protective plate, 14 is a return air outlet insulation layer, and 15 is a return air outlet fixing block. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] Please see attached Figure 1 and attached Figure 2 A detachable gas quenching return air device includes a hot zone shell 1, a hot zone insulation layer 9 installed on the inner wall of the hot zone shell 1, a return air port 101 formed on the rear wall of the hot zone shell 1, and a hatch 3 covering the return air port 101.

[0026] The hot zone shell 1 and its return air port 101 , the hot zone insulation layer 9 and the hatch 3 are all conventional structures of a high pressure gas quenching furnace and will not be described in detail herein.

[0027] Please see attached Figure 1 and attached Figure 2The detachable gas quenching return air device also includes a return air window frame 2, a hinge and a protection plate 13; the return air window frame 2 is detachably mounted on the outer wall of the hot zone shell 1, and a return air expansion port 201 connected to the return air port is formed on the return air window frame 2; the hatch 3 is hinged to the return air window frame 2 through a hinge, so that the hatch 3 is sealed and embedded in the return air expansion port 201 and closes the return air port 101; the protection plate 13 is covered and installed on the hot zone insulation layer 9 located around the return air port 101 through a third mounting member 12, so that the hot zone insulation layer 9 located around the return air port 101 is isolated from the gas quenching high-pressure gas through the protection plate 13.

[0028] The return air window frame 2 is installed on the outer wall of the return air outlet 101 of the hot zone shell 1, which is convenient for the detachable installation of the hatch cover 3, and the hatch cover 3 is installed in the form of a hinge. The hatch cover 3 is opened and closed by rotating outward and inward. When the hatch cover 3 is rotated and closed, a certain lateral force can be applied to the return air expansion port 201 to ensure that the hatch cover 3 is closed at the return air expansion port 201 and the return air outlet 101, which has a more reliable sealing effect than the traditional descending cover closure. At the same time, the hatch cover 3 can be rotated open under the action of the internal pressure of the hot zone shell 1, and rotated closed under the action of the gravity of the hatch cover 3 after the internal pressure of the hot zone shell 1 is reduced. The rotation opening and closing is flexible, and there is no need to set a cylinder to control the lifting and opening and closing of the hatch cover 3.

[0029] The protective plate 13 is installed to cover the hot zone insulation layer 9. The shape and size of the protective plate 13 can be determined according to the scouring area of ​​the hot zone insulation layer 9 when the gas quenching high-pressure gas is discharged, so as to ensure that the protective plate 13 can isolate the hot zone insulation layer 9 from the gas quenching high-pressure gas, and avoid the gas quenching high-pressure gas from scouring the hot zone insulation layer 9 locally and frequently, thereby causing local erosion of the hot zone insulation layer 9. The protective plate 13 is detachably installed by the third mounting member 12, which is convenient for replacement. After the protective plate 13 is eroded, only the protective plate 13 needs to be replaced, avoiding the high cost maintenance of replacing the hot zone insulation layer 9 as a whole.

[0030] Preferably, the protection plate 13 can be made of a high-density CFC hard graphite plate, which can withstand long-term and frequent scouring of the gas-quenching high-pressure gas. The cross-section of the protection plate 13 can be L-shaped, so that it can cover the flow scouring path of the gas-quenching high-pressure gas at the return air port 101, ensuring the protection effect of the hot zone insulation layer 9. The third mounting member 12 can be made of a molybdenum rod and a gasket, which is easy to disassemble and assemble.

[0031] Please see attached Figure 1 and attached Figure 2 The return air vent insulation layer 14 is detachably embedded in the return air window frame 2 and fixed by the first mounting member 4 .

[0032] The return air vent insulation layer 14 is filled in the return air window frame 2 to ensure the insulation performance of the return air window frame 2, thereby preventing heat loss at the return air vent when the furnace body is heated, which is beneficial to the uniformity of the heating temperature of the furnace body. The return air vent insulation layer 14 is detachably installed for easy replacement and maintenance.

[0033] Preferably, the first mounting member 4 may be made of a molybdenum rod and a gasket, so as to facilitate the disassembly and replacement of the return air outlet insulation layer 14 .

[0034] Please see attached Figure 1 and attached Figure 2 The return air expansion port 201 is a trumpet-shaped structure with a small inside and a large outside. The size of the small end of the return air expansion port 201 is consistent with the size of the return air port 101, so that the small end of the return air expansion port 201 is connected to the inside of the hot zone shell 1 through the return air port 101; the hatch 3 is sealed and embedded at the large end of the return air expansion port 201.

[0035] The trumpet-shaped return air expansion port 201 can increase the gas flow rate when the gas quenching high-pressure gas is discharged, and at the same time facilitates the sealed embedding of the hatch cover 3 at the large end of the return air expansion port 201.

[0036] Please see attached Figure 1 and attached Figure 2 A hatch cover convex portion matching the large end of the return air expansion port 201 is formed on the inner wall of the hatch cover 3, and the hatch cover convex portion is matched and embedded in the large end of the return air expansion port 201, so that the hatch cover 3 seals the return air expansion port 201 and the return air port 101.

[0037] By setting the hatch cover convex part, it can be embedded in the return air expansion port 201, improving the sealing performance between the hatch cover convex part and the return air expansion port 201, thereby avoiding heat loss caused by the gap at the return air port 101. The inner small and outer large structure of the return air expansion port 201 and the hatch cover convex part can further improve the embedding matching and sealing performance of the two.

[0038] Please see attached Figure 1 and attached Figure 2 The hatch cover 3 and the hatch cover protrusion are detachably embedded with a hatch cover insulation layer 5 and fixed by a second mounting member 6.

[0039] The hatch cover 3 is filled with a hatch cover insulation layer 5 to ensure the thermal insulation performance of the hatch cover 3, thereby further avoiding heat loss at the return air port 101 when the furnace body is heated, which is beneficial to the uniformity of the heating temperature of the furnace body. The hatch cover insulation layer 5 is detachably installed to facilitate replacement and maintenance.

[0040] Preferably, the second mounting member 6 may be made of a molybdenum rod and a gasket, so as to facilitate the disassembly and replacement of the hatch cover insulation layer 5 .

[0041] Please see attached Figure 1 and attached Figure 2 A counterweight 11 is provided at the bottom of the hatch cover 3.

[0042] The counterweight 11 applies a downward force to the hatch cover 3 , so that the hatch cover protrusion is pressed against the return air expansion opening 201 more firmly and stably, thereby improving the sealing effect between the hatch cover protrusion and the return air expansion opening 201 .

[0043] Please see attached Figure 1 and attached Figure 2 The hinged parts include hinges 7 and bushings 8. A first hinged joint 202 is provided at the top of the return air window frame 2, and a second hinged joint 301 is provided at the top of the hatch 3. The first hinged joint 202 is rotatably hinged to the second hinged joint 301 through the hinge 7 and bushing 8, so that the hatch 3 can be rotatably opened and closed and embedded in the return air expansion port 201.

[0044] By setting the hinge 7 and the bushing 8, the hatch cover 3 can stably rotate relative to the return air window frame 2. The tightness of the hinge 7 is adjusted. When gas quenching begins, the internal pressure of the hot zone shell 1 increases, and the hatch cover 3 rotates from the inside to the outside around the hinge 7 under the action of pressure to open. After the gas quenching is completed, the inside of the hot zone shell 1 decreases, and the hatch cover 3 rotates from the outside to the inside around the hinge 7 under the action of gravity to close, and the convex part of the hatch cover is embedded in the return air expansion 201 under the action of gravity and inertia, ensuring that the hatch cover 3 can be flexibly opened and closed while ensuring the sealing of the furnace body during the heating process.

[0045] Please see attached Figure 1 and attached Figure 2 On the outer wall of the rear wall of the hot zone shell 1, a plurality of return air outlet fixing blocks 15 are arranged at intervals outside the return air outlet 101. The return air window frame 2 is installed on the plurality of return air outlet fixing blocks 15 by means of mounting bolts 10, so that the return air window frame 2 is fixedly installed at the return air outlet of the hot zone shell 1.

[0046] The return air vent fixing block 15 can be fixedly welded on the rear wall outer wall of the hot zone housing 1, and the number of the return air vent fixing blocks 15 can be adaptively adjusted according to actual installation requirements to ensure that the return air window frame 2 is firmly and tightly locked to the return air vent 101 of the hot zone housing 1 through the mounting bolts 10. The disassembly and maintenance of the return air window frame 2 is more convenient.

[0047] Please see attached Figure 1 and attached Figure 2 , the usage method and working principle of the utility model are:

[0048] When the furnace is heated, the hatch cover 3 droops naturally by gravity and the counterweight 11, and the sealing of the return air outlet is ensured because the hatch cover convex part is embedded in the return air expansion port 201. At the same time, because the hatch cover convex part and the return air expansion port 201 are both small inside and large outside structures, the compression reliability of the hatch cover convex part and the return air expansion port 201 can be improved under the action of the gravity of the hatch cover 3 and the counterweight 11, and the sealing of the return air outlet is further ensured.

[0049] During gas quenching, the hatch cover 3 can be rotated outward around the hinge 7 to open. The movement trajectory of the hatch cover 3 is as follows: Figure 2 As shown by the middle arc dotted line, the return air expansion port 201 with a small inner side and a large outer side is used to ensure as much gas flow as possible at the return air port. The gas flow direction is as follows: Figure 2 As shown by the arrow in the figure, the cooling speed inside the hot zone shell 1 is accelerated. When the high-pressure gas is discharged, it washes on the protection plate 13, avoiding direct washing of the hot zone insulation layer 9 located around the return air port 101, thereby avoiding local erosion of the hot zone insulation layer 9 and its overall replacement.

[0050] When maintaining the equipment, the mounting bolts 10 can be loosened, the return air window frame 2 can be removed, and the return air inlet insulation layer 14 inside the return air window frame 2 and the hatch cover insulation layer 5 inside the hatch cover 3 can be replaced; after the protective plate 13 is corroded, only the protective plate 13 needs to be replaced, which greatly reduces the maintenance cost and improves the maintenance convenience; the maintenance cost of the entire return air device is low and the maintenance efficiency is high, which greatly reduces the downtime of furnace maintenance.

[0051] The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A detachable gas quenching return air device, comprising a hot zone shell (1), a hot zone insulation layer (9) installed on the inner wall of the hot zone shell (1), a return air port (101) formed on the rear wall of the hot zone shell (1), and a hatch (3) covering the return air port (101); Its characteristics are: The detachable gas quenching return air device further comprises a return air window frame (2), a hinge and a protection plate (13); the return air window frame (2) is detachably mounted on the outer wall of the hot zone housing (1), and a return air expansion port (201) communicating with the return air port is formed on the return air window frame (2); the hatch cover (3) is hingedly connected to the return air window frame (2) through the hinge, so that the hatch cover (3) is sealed and embedded in the return air expansion port (201) and closes the return air port (101); the protection plate (13) is covered and mounted on the hot zone insulation layer (9) located around the return air port (101), so that the hot zone insulation layer (9) located around the return air port (101) is isolated from the gas quenching high-pressure gas through the protection plate (13).

2. The detachable gas quenching return air device according to claim 1 is characterized in that: A return air outlet insulation layer (14) is detachably embedded in the return air window frame (2).

3. The detachable gas quenching and air return device according to claim 1 is characterized in that: The return air expansion port (201) is a trumpet-shaped structure that is small inside and large outside. The size of the small end of the return air expansion port (201) is consistent with the size of the return air port (101), so that the small end of the return air expansion port (201) is connected to the inside of the hot zone shell (1) through the return air port (101); the hatch (3) is sealed and embedded at the large end of the return air expansion port (201).

4. The detachable gas quenching return air device according to claim 3 is characterized in that: A hatch cover convex portion matching the large end of the return air expansion opening (201) is formed on the inner wall of the hatch cover (3), and the hatch cover convex portion is matched and embedded in the large end of the return air expansion opening (201), so that the hatch cover (3) seals and covers the return air expansion opening (201) and the return air port (101).

5. The detachable gas quenching return air device according to claim 4 is characterized in that: The hatch cover (3) and the hatch cover convex part are detachably embedded with a hatch cover insulation layer (5).

6. The detachable gas quenching return air device according to claim 1, 4 or 5, characterized in that: A counterweight (11) is provided at the bottom of the hatch cover (3).

7. The detachable gas quenching and air return device according to claim 1 is characterized in that: The hinged part comprises a hinge (7) and a bushing (8); a first hinged joint (202) is provided at the top of the return air window frame (2); a second hinged joint (301) is provided at the top of the hatch cover (3); the first hinged joint (202) is rotatably hinged to the second hinged joint (301) via the hinge (7) and the bushing (8), so that the hatch cover (3) can be rotatably opened and closed and embedded in the return air expansion port (201).

8. The detachable gas quenching and air return device according to claim 1 is characterized in that: A plurality of return air outlet fixing blocks (15) are arranged at intervals on the outer side of the return air outlet (101) on the rear wall of the hot zone housing (1), and the return air window frame (2) is mounted on the plurality of return air outlet fixing blocks (15), so that the return air window frame (2) is fixedly mounted at the return air outlet of the hot zone housing (1).

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