Vacuum gas quenching furnace waste heat recovery structure

Abstract

The utility model relates to the technical field of waste heat recovery, and discloses a vacuum gas quenching furnace waste heat recovery structure which comprises a base, a vacuum furnace is fixedly installed on the outer surface of the upper end of the base, a sealing cover is movably connected to the outer surface of the upper end of the vacuum furnace, and a vacuum pump is fixedly installed on the outer surface of the upper end of the sealing cover. The device comprises a base and a vacuum furnace, an air inflation tank is fixedly installed on the outer surface of one side of the base and connected with the vacuum furnace through a pipeline, the vacuum furnace comprises an outer shell and an inner shell, and a heat exchange pipeline is fixedly installed in a gap between the outer shell and the inner shell. According to the vacuum gas quenching furnace, the arranged heat exchange pipelines are of a spiral annular structure and are evenly distributed on the outer wall of the inner shell, waste heat of the vacuum gas quenching furnace can be recycled to the maximum extent, the contact area with a medium needing to be heated is increased through the spiral pipe on the inner side of the exchange box, and waste heat stored in the heat storage tank can be sufficiently transferred to the medium needing to be heated; therefore, the utilization efficiency of energy is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, in particular to a waste heat recovery structure for a vacuum quenching furnace. Background Technique

[0002] Vacuum quenching furnaces are widely used in industrial production for the vacuum bright quenching of die steel to obtain parts such as dies with properties of high hardness, high wear resistance, and low deformation, and can also be used for the cooling treatment after sintering of powder metallurgy products and the vacuum heat treatment (such as quenching) of other materials such as copper alloys.

[0003] However, a large amount of waste heat is generated during the operation of vacuum quenching furnaces. At present, the waste heat of many vacuum quenching furnaces has not been effectively recovered and utilized, which not only causes waste of energy but also increases the production cost of enterprises and the thermal pollution to the environment. Therefore, it is of great practical significance to design an effective waste heat recovery structure for vacuum quenching furnaces.

[0004] To solve the above problems, a waste heat recovery structure for a vacuum quenching furnace is proposed in this application. Content of the Utility Model

[0005] The purpose of the utility model is to provide a waste heat recovery structure for a vacuum quenching furnace to solve the problem that the waste heat in the prior art during the operation of the vacuum quenching furnace has not been effectively recovered and utilized as mentioned in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A waste heat recovery structure for a vacuum quenching furnace, including a base, the upper outer surface of the base is fixedly installed with a vacuum furnace, the upper outer surface of the vacuum furnace is movably connected with a sealing cover, the upper outer surface of the sealing cover is fixedly installed with a vacuum pump, one side outer surface of the base is fixedly installed with an inflation tank, and the inflation tank is connected to the vacuum furnace through a pipeline. The vacuum furnace includes an outer shell and an inner shell, and a heat exchange pipeline is fixedly installed between the gaps of the outer shell and the inner shell. The lower end of the heat exchange pipeline is fixedly connected with a liquid inlet pipe, the upper end of the heat exchange pipeline is fixedly connected with a liquid outlet pipe, one end of the liquid outlet pipe is connected to a heat storage tank, one end of the liquid inlet pipe is connected to a water pump, and the heat storage tank and the water pump are connected through a pipeline. The upper outer surface of the base is fixedly installed with a heat exchange box.

[0007] Preferably, the heat exchange pipeline is evenly distributed in a spiral annular structure on the outer wall of the inner shell and is made of aluminum, with good heat conduction performance, capable of quickly absorbing the heat in the furnace.

[0008] Preferably, a spiral tube is fixedly installed inside the heat exchange box. The outer walls on both sides of the spiral tube are respectively connected with a water inlet pipe and a water return pipe. An external pipeline is installed on the outer surface of one side of the heat exchange box.

[0009] Preferably, both the water inlet pipe and the water return pipe penetrate through the inner wall of the heat storage tank, and the horizontal position of the water inlet pipe is higher than that of the water return pipe.

[0010] Preferably, a heat storage cover is detachably connected to the outer surface of the upper end of the heat storage tank, and a liquid supplement pipe is fixedly installed on the outer surface of the upper end of the heat storage cover.

[0011] Preferably, a gas collecting hood is fixedly connected to the outer surface of the upper end of the heat storage cover. A steam pipe is fixedly connected to the outer surface of the upper end of the gas collecting hood. The other end of the steam pipe is connected to a steam generator, and the steam generator is installed on the outer surface of the upper end of the base.

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

[0013] 1. In the present utility model, the heat exchange pipelines are arranged in a spiral ring structure and evenly distributed on the outer wall of the inner shell, which can maximize the recovery of the waste heat of the vacuum quenching furnace. In addition, the spiral tube inside the exchange box increases the contact area with the medium to be heated, and the waste heat stored in the heat storage tank can be fully transferred to the medium to be heated, thereby effectively improving the energy utilization efficiency.

[0014] 2. In the present utility model, the gas collecting hood is provided to converge the water vapor in the heat storage tank, and then it is transported to the steam generator through the steam pipe, thereby driving the steam generator to generate electricity, so that the excess heat energy can be converted into electrical energy for storage, avoiding the waste of energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the main structure of a waste heat recovery structure of a vacuum quenching furnace of the present utility model Figure 1 ;

[0016] Figure 2 is a schematic diagram of the main structure of a waste heat recovery structure of a vacuum quenching furnace of the present utility model Figure 2 ;

[0017] Figure 3 is a schematic diagram of the internal structure of the vacuum furnace in a waste heat recovery structure of a vacuum quenching furnace of the present utility model;

[0018] Figure 4 is a schematic diagram of the internal structure of the heat exchange box in a waste heat recovery structure of a vacuum quenching furnace of the present utility model;

[0019] In the figure: 1, base; 2, vacuum furnace; 3, sealing cover; 4, vacuum pump; 5, gas charging tank; 6, outer shell; 7, inner shell; 8, heat exchange pipe; 9, liquid inlet pipe; 10, liquid outlet pipe; 11, heat storage tank; 12, water pump; 13, heat exchange box; 14, spiral pipe; 15, water inlet pipe; 16, water return pipe; 17, external pipe; 18, heat storage cover; 19, liquid supplement pipe; 20, gas collecting hood; 21, steam pipe; 22, steam generator. Specific implementation manner

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0021] Please refer to Figures 1 - 4 , the present invention provides a technical solution: a waste heat recovery structure for a vacuum quenching furnace, including a base 1, a vacuum furnace 2 is fixedly installed on the upper outer surface of the base 1, a sealing cover 3 is movably connected to the upper outer surface of the vacuum furnace 2, a vacuum pump 4 is fixedly installed on the upper outer surface of the sealing cover 3, a gas charging tank 5 is fixedly installed on one side outer surface of the base 1, and the gas charging tank 5 is connected to the vacuum furnace 2 through a pipeline. The vacuum furnace 2 includes an outer shell 6 and an inner shell 7. A heat exchange pipe 8 is fixedly installed between the gaps of the outer shell 6 and the inner shell 7. The lower end of the heat exchange pipe 8 is fixedly connected to a liquid inlet pipe 9, the upper end of the heat exchange pipe 8 is fixedly connected to a liquid outlet pipe 10, one end of the liquid outlet pipe 10 is connected to a heat storage tank 11, one end of the liquid inlet pipe 9 is connected to a water pump 12, and the heat storage tank 11 and the water pump 12 are connected through a pipeline. A heat exchange box 13 is fixedly installed on the upper outer surface of the base 1.

[0022] In the above structure, the sealing cover 3 is connected to the vacuum furnace 2 through a hydraulic rod. The sealing cover 3 can be driven to move up and down by the telescopic hydraulic rod for quickly opening and closing the vacuum furnace 2. The vacuum pump 4 is provided to evacuate the vacuum furnace 2 to prevent the oxidation of the workpiece. The gas charging tank 5 uses a pipeline to fill nitrogen into the vacuum furnace 2, which can take away the heat of the workpiece in the vacuum furnace 2 and can quickly cool the workpiece for easy removal. A heat preservation layer is provided inside the heat storage tank 11 to prevent the heat loss of the internal liquid, and a water level monitor and a temperature monitor are installed inside to detect the water level in real time to prevent the high water level from causing the liquid to flow to the steam pipe 21, and to monitor the internal temperature in real time.

[0023] In this embodiment, as Figure 3 Figure 4As shown, the heat exchange pipe 8 is a spiral annular structure evenly distributed on the outer wall of the inner shell 7 and is made of aluminum, with good heat conduction performance, capable of quickly absorbing the heat in the furnace. A spiral pipe 14 is fixedly installed on the inner side of the heat exchange box 13. The outer walls on both sides of the spiral pipe 14 are respectively connected with a water inlet pipe 15 and a water return pipe 16. An external pipe 17 is installed on the outer surface of one side of the heat exchange box 13. The hot water in the heat storage tank 11 flows into the spiral pipe 14 through the water inlet pipe 15. Due to the spiral structure of the spiral pipe 14, the water or air that needs to be heated inside the heat exchange box 13 can be in full contact with the surface of the spiral pipe 14, so that the heat source can be fully transferred to the medium to be heated through the spiral pipe 14. After the heat of the liquid in the spiral pipe 14 is transferred, it flows back into the heat storage tank 11 through the water return pipe 16. The external pipe 17 runs through the inside of the heat exchange box 13 and is used to transfer the medium to be heated into the heat exchange box 13 for heating. Both the water inlet pipe 15 and the water return pipe 16 run through the inner wall of the heat storage tank 11, and the horizontal position of the water inlet pipe 15 is higher than that of the water return pipe 16. Utilizing the fact that the water inlet pipe 15 is higher than the water return pipe 16 is more conducive to the flow of the liquid and the transfer of heat. The upper outer surface of the heat storage tank 11 is detachably connected with a heat storage cover 18, and a liquid supplement pipe 19 is fixedly installed on the upper outer surface of the heat storage cover 18. Liquid can be added into the heat storage tank 11 through the liquid supplement pipe 19 to supplement the evaporated water, and a control valve is installed outside the liquid supplement pipe 19, which can effectively control the water level in the heat storage tank 11 and prevent it from overflowing.

[0024] In this embodiment, as Figure 1 Figure 2 shown, a gas collecting hood 20 is fixedly connected to the upper outer surface of the heat storage cover 18. A steam pipe 21 is fixedly connected to the upper outer surface of the gas collecting hood 20. The other end of the steam pipe 21 is connected to a steam generator 22, and the steam generator 22 is installed on the upper outer surface of the base 1. The bottom of the gas collecting hood 20 is communicated with the inside of the heat storage tank 11 and is used for converging the steam in the heat storage tank 11.

[0025] Working principle:

[0026] When recovering the waste heat of a vacuum quenching furnace, the liquid (water) inside the heat storage tank 11 is transported through the liquid inlet pipe 9 into the bottom end of the heat exchange pipeline 8 by the water pump 12. The pressure of the water pump 12 can push the liquid from the bottom of the heat exchange pipeline 8 to its upper end, and then it flows back into the heat storage tank 11 through the liquid outlet pipe 10. When the liquid flows through the heat exchange pipeline 8, it absorbs the excess heat in the vacuum furnace 2. Then, through the heat exchange box 13, the waste heat stored in the heat storage tank 11 is transferred to the medium to be heated, such as hot water, air, etc., so that the excess heat can be used for heating industrial or domestic water, heating, etc. The liquid inside the heat storage tank 11 generates steam after heating. The steam converges through the gas collecting hood 20 and is then transported to the steam generator 22 through the steam pipe 21, thereby driving the steam generator 22 to generate electricity, enabling the conversion of the excess heat energy into electrical energy for storage and avoiding energy waste.

[0027] Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

Claims

1. A vacuum gas quenching furnace waste heat recovery structure, comprising a base (1), characterized in that: A vacuum furnace (2) is fixedly mounted on the upper outer surface of the base (1), a sealing cover (3) is movably connected to the upper outer surface of the vacuum furnace (2), a vacuum pump (4) is fixedly mounted on the upper outer surface of the sealing cover (3), an air filling tank (5) is fixedly mounted on one side outer surface of the base (1), and the air filling tank (5) is connected to the vacuum furnace (2) via a pipeline, and the vacuum furnace (2) comprises an outer shell (6) and an inner shell (7), and the outer shell (6) and the inner shell (7) are connected to each other. ), a heat exchange pipe (8) is fixedly installed between the gaps of the base (1), a liquid inlet pipe (9) is fixedly connected to the lower end of the heat exchange pipe (8), a liquid outlet pipe (10) is fixedly connected to the upper end of the heat exchange pipe (8), one end of the liquid outlet pipe (10) is connected to a heat storage tank (11), one end of the liquid inlet pipe (9) is connected to a water pump (12), and the heat storage tank (11) and the water pump (12) are connected via a pipe, and a heat exchange box (13) is fixedly installed on the outer surface of the upper end of the base (1).

2. A vacuum gas quenching furnace waste heat recovery structure according to claim 1, characterized in that: The heat exchange pipe (8) is a spiral ring structure evenly distributed on the outer wall of the inner shell (7), and is made of aluminum, has good thermal conductivity, and can quickly absorb the heat in the furnace.

3. The vacuum gas quenching furnace waste heat recovery structure according to claim 1, characterized in that: A spiral tube (14) is fixedly installed on the inner side of the heat exchange box (13), and the outer walls on both sides of the spiral tube (14) are respectively connected to a water inlet pipe (15) and a water return pipe (16), and an external pipeline (17) is installed on the outer surface of one side of the heat exchange box (13).

4. A vacuum gas quenching furnace waste heat recovery structure according to claim 3, characterized in that: The water inlet pipe (15) and the water return pipe (16) both penetrate the inner wall of the heat storage tank (11), and the horizontal position of the water inlet pipe (15) is higher than that of the water return pipe (16).

5. The vacuum gas quenching furnace waste heat recovery structure according to claim 1, characterized in that: The upper outer surface of the heat storage tank (11) is detachably connected to a heat storage cover (18), and the upper outer surface of the heat storage cover (18) is fixedly mounted with a liquid infusion tube (19).

6. A vacuum gas quenching furnace waste heat recovery structure according to claim 5, characterized in that: The upper outer surface of the heat storage cover (18) is fixedly connected to an air collecting hood (20), the upper outer surface of the air collecting hood (20) is fixedly connected to a steam pipe (21), the other end of the steam pipe (21) is connected to a steam generator (22), and the steam generator (22) is mounted on the upper outer surface of the base (1).

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