Quenching holding furnace for forging

Abstract

The quenching heat preservation furnace comprises a furnace body, a heat exchanger and a heat preservation water tank, a furnace cover is rotationally installed at the upper end of the furnace body, a furnace pipe is arranged in the furnace body and provided with a heat preservation cavity, and an induction coil is arranged between the inner wall of the furnace body and the outer wall of the furnace pipe. A cooling water inlet pipe and a cooling water outlet pipe are connected to the induction coil, one end of the cooling water outlet pipe is connected with the heat exchanger, a heating water feeding pipe and a heating water return pipe are connected between the heat preservation water tank and the heat exchanger, and a circulating pump is arranged on the heating water feeding pipe. According to the device, cooling water in the heat preservation water tank is used as a heat source for heating water in the heat preservation water tank, then hot water in the heat preservation water tank is used for preserving heat of the furnace pipe, the heat utilization rate of the quenching furnace is increased, the good heat preservation effect can be achieved, and energy is relatively saved.

Description

Technical Field

[0001] The utility model relates to the technical field of quenching and holding furnaces, in particular to a quenching and holding furnace for forging. Background Art

[0002] Quenching is a heat treatment process in which steel is heated to a temperature above the critical temperature Ac3 (hypoeutectoid steel) or Ac1 (hypereutectoid steel), kept warm for a period of time to make it fully or partially austenitized, and then cooled rapidly to below Ms (or isothermally near Ms) at a cooling rate greater than the critical cooling rate to undergo martensite (or bainite) transformation. Therefore, the furnace used in the quenching process should have both heating and insulation functions. Most existing quenching furnaces are made of a single refractory material, which has a poor insulation effect. Heating equipment needs to be used during the insulation process to replenish the lost heat.

[0003] For example, a comparative document with publication number CN217757554U provides a heat preservation device for quenching furnace processing, including a quenching furnace body, the interior of the quenching furnace body is sequentially provided with a refractory liner, a heat insulation layer and a water bath insulation layer from the inside to the outside, and both sides of the inner wall of the refractory liner are fixedly connected with heating modules, and the left side of the quenching furnace body is connected with a flue, and the left end of the flue passes through the quenching furnace body, the water bath insulation layer, the heat insulation layer and the refractory liner from left to right in sequence and extends to the interior of the refractory liner and is connected thereto. This utility model solves the problem of excessive internal temperature loss when the traditional quenching furnace stops heating, and has the advantage of using the flue gas generated when the raw materials are quenched to improve the heat preservation effect of the quenching furnace. However, the device uses the high-temperature flue gas in the furnace body to heat the insulation water of the water bath layer, which essentially uses the heat source of the heating device of the device. The flue sucks hot air from the furnace body, which will reduce the temperature in the furnace body. If the predetermined heating temperature is to be achieved, the heating power of the heat source needs to be increased. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a quenching and heat-insulating furnace for forging, which solves the problem that the existing quenching furnace has an unsatisfactory heat-insulating effect and needs to rely on heating equipment to consume a certain amount of energy to supplement heat.

[0005] To achieve the above purpose, the utility model is implemented through the following technical solutions: a quenching and heat preservation furnace for forging, comprising a furnace body, a heat exchanger and a heat preservation water tank, a furnace cover is rotatably installed on the upper end of the furnace body, a furnace gallbladder is arranged in the furnace body, the furnace gallbladder is provided with a heat preservation cavity, an induction coil is arranged between the inner wall of the furnace body and the outer wall of the furnace gallbladder, a cooling water inlet pipe and a cooling water outlet pipe are connected to the induction coil, one end of the cooling water outlet pipe is connected to the heat exchanger, and the heat preservation water tank is connected to the heat exchanger. A heating upper water pipe and a heating return water pipe are connected, and a circulation pump is arranged on the heating upper water pipe. An insulation water inlet pipe and an insulation return water pipe are connected between the insulation water tank and the insulation chamber, and an inlet pump and an inlet valve are arranged on the insulation water inlet pipe, and a return pump and a return valve are arranged on the insulation return pipe. A cooling water return pipe is connected to the heat exchanger, and the cooling water return pipe is communicated with the cooling water outlet pipe through the heat exchanger, and the heating upper water pipe is communicated with the heating return water pipe through the heat exchanger.

[0006] Preferably, an auxiliary heater and a temperature sensor are installed in the heat preservation chamber.

[0007] Preferably, an exhaust valve is connected to the upper portion of the heat preservation chamber.

[0008] Preferably, the thermal insulation water tank is provided with a vacuum thermal insulation chamber.

[0009] Preferably, a water inlet is provided at the upper end of the thermal insulation water tank, a pressure relief valve is connected to one side of the water inlet, and a filter is provided at the lower end of the water inlet.

[0010] Preferably, an observation window is provided on the furnace cover.

[0011] Beneficial Effects

[0012] The utility model provides a quenching and holding furnace for forging, which has the following beneficial effects:

[0013] 1. This device sets a heat exchanger to exchange heat between cooling water and insulation water, uses the induction coil cooling water as a heat source to heat the water in the insulation water tank, and then uses the hot water in the insulation water tank to keep the furnace warm. It does not need to consume additional energy to supplement the heat lost by the furnace body, and can achieve better insulation effect and save energy.

[0014] 2. At the same time, the temperature of the cooling water of this device is reduced after passing through the heat exchanger, so the outlet water temperature of the cooling water return pipe is relatively low, which reduces the difficulty of handling the cooling water of the induction coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the front view of the utility model.

[0016] In the figure: 1. furnace body; 2. induction coil; 3. furnace core; 4. exhaust valve; 5. furnace cover; 5-1, observation window; 6. insulation chamber; 7. cooling water inlet pipe; 8. cooling water return pipe; 9. heat exchanger; 10. circulation pump; 11. auxiliary heater; 12. water inlet; 13. pressure relief valve; 14. insulation water tank; 15. vacuum insulation layer; 16. heating water pipe; 17. insulation inlet pipe; 18. insulation return pipe; 19. heating return pipe; 20. cooling outlet pipe; 21. return pump; 22. inlet pump; 23. return valve; 24. inlet valve; 25. temperature sensor; 26. filter. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1 The utility model provides a technical solution: a quenching and holding furnace for forging, comprising a furnace body 1, a heat exchanger 9 and a heat preservation water tank 14, a furnace cover 5 is rotatably installed on the upper end of the furnace body 1, a furnace 3 is arranged in the furnace body 1, and the furnace 3 is provided with a heat preservation chamber 6, an induction coil 2 is arranged between the inner wall of the furnace body 1 and the outer wall of the furnace 3, a cooling water inlet pipe 7 and a cooling water outlet pipe 20 are connected to the induction coil 2, one end of the cooling water outlet pipe 20 is connected to the heat exchanger 9, and a heating upper water pipe 16 and a heating upper water pipe 20 are connected between the heat exchanger 9 and the heat preservation water tank 14. A return pipe 19, a circulation pump 10 is provided on the heating upper water pipe 16, an insulation water inlet pipe 17 and an insulation return pipe 18 are connected between the insulation water tank 14 and the insulation chamber 6, an inlet pump 22 and an inlet valve 24 are provided on the insulation inlet pipe 17, and a return pump 21 and a return valve 23 are provided on the insulation return pipe 18, a cooling water return pipe 8 is connected to the heat exchanger 9, the cooling water return pipe 8 and the cooling water outlet pipe 20 are connected through the heat exchanger 9, and the heating upper water pipe 16 and the heating return pipe 19 are connected through the heat exchanger 9;

[0019] When the device is used to heat the forging, the induction coil 2 is connected to an alternating current, and the induction coil 2 generates an alternating magnetic field to induce eddy currents in the forging. The forging can be heated by utilizing the thermal effect of the eddy currents. Cooling water flows into the induction coil 2 through the cooling water inlet pipe 7 to cool the induction coil 2. The high-temperature cooling water flows into the heat exchanger 9 through the cooling outlet pipe 20 and flows out through the cooling water return pipe 8. The circulating pump 10 is provided to allow the water in the heat preservation water tank 14 to flow into the heat exchanger 9 through the heating upper water pipe 16 and be heated. The return pipe 19 flows back to the insulation water tank 14, and the high-temperature cooling water flowing out of the induction coil 2 and the water in the insulation water tank 14 complete heat exchange in the heat exchanger 9, thereby increasing the water temperature in the insulation water tank 14; when using this device to insulate forgings, the water in the insulation water tank 14 is pumped by the water inlet pump 22 to enter the insulation chamber 6 of the furnace 3 through the insulation water inlet pipe 17 to insulate the forgings. After the insulation process is completed, the water in the insulation chamber 6 is pumped by the return water pump 21 to flow back to the insulation water tank through the insulation return pipe 18.

[0020] Furthermore, an auxiliary heater 11 and a temperature sensor 25 are installed in the heat preservation chamber 6;

[0021] When the temperature sensor 25 detects that the water temperature in the heat preservation chamber does not meet the process requirements, the auxiliary heater 11 can be activated to perform auxiliary heating on the water in the heat preservation chamber 6 .

[0022] Furthermore, the upper portion of the heat preservation chamber 6 is connected to an exhaust valve 4;

[0023] When water is injected into the insulation chamber 6, the exhaust valve 4 can be opened to discharge the air in the insulation chamber 6. After the insulation chamber 6 is filled with water, the exhaust valve 4 is closed. After the exhaust valve 4 is closed, it has an automatic pressure relief function. When the pressure in the insulation chamber 6 rises to the maximum allowable value, the exhaust valve 4 can automatically open to relieve the pressure.

[0024] Furthermore, the heat preservation water tank 14 is provided with a vacuum heat preservation chamber 15;

[0025] The vacuum heat preservation chamber 15 is provided to prevent the heat loss of the heat preservation water tank and improve the heat preservation effect.

[0026] Furthermore, a water inlet 12 is provided at the upper end of the thermal insulation water tank 14, a pressure relief valve 13 is connected to one side of the water inlet 12, and a filter screen 26 is provided at the lower end of the water inlet 12;

[0027] The water inlet 12 can be opened to fill water into the insulated water tank. After the filling is completed, the water inlet 12 is closed. When the pressure in the insulated water tank 14 reaches the maximum allowable value, the pressure relief valve 13 opens and releases the pressure in the insulated water tank. The filter screen 26 can filter solid impurities in the water entering the water inlet 12.

[0028] Furthermore, the furnace cover 5 is provided with an observation window 5-1;

[0029] The setting of the observation window 5-1 can facilitate observation of the forging state.

[0030] By those skilled in the art, the components in this case are connected in sequence. The specific connection and operation sequence should refer to the following working principle. The detailed connection means are well-known technologies in the field. The following mainly introduces the working principle and process.

[0031] Embodiment: When using the device to heat a forging, the furnace cover 5 is opened to place the forging in the furnace 3, the cooling water inlet pipe 7 and the cooling water return pipe 8 are connected to the external cooling water circuit, the induction coil 2 is connected to the alternating current, the induction coil 2 generates an alternating magnetic field to induce eddy currents in the forging, and the forging can be heated by utilizing the thermal effect of the eddy currents. The cooling water flows into the induction coil 2 through the cooling water inlet pipe 7 to cool the induction coil 2, the high-temperature cooling water flows into the heat exchanger 9 through the cooling outlet pipe 20 and flows out through the cooling water return pipe 8, and the circulation pump 10 is started at the same time, and the inlet pump 22, the return pump 21, the inlet valve 24 and the return valve 23 are all kept in a closed state, so that the water in the insulation water tank 14 flows into the heat exchanger 9 through the heating upper water pipe 16 and flows back through the heating return pipe 19. The high-temperature cooling water flowing out of the induction coil 2 and the water in the insulation water tank 14 complete heat exchange in the heat exchanger 9, thereby increasing the temperature of the water in the insulation water tank 14; when using the present device to insulate the forging, open the exhaust valve 4, and then open the water inlet valve 24 and start the water inlet pump 22 to inject the water in the insulation water tank 14 into the insulation chamber 6. After the insulation chamber 6 is filled with water, close the exhaust valve 4, and use the hot water in the insulation chamber 6 to improve the insulation effect of the furnace 2. When the temperature sensor 25 detects that the water temperature in the insulation chamber does not meet the process requirements, the auxiliary heater 11 can be enabled to perform auxiliary heating on the water in the insulation chamber 6. After the insulation process is completed, open the exhaust valve 4 and the return valve 23, and start the return pump 21 to allow the water in the insulation chamber 6 to flow back to the insulation 14.

[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Although the embodiments of the utility model have been shown and described, it is understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the utility model, and the scope of the utility model is defined by the attached claims and their equivalents.

Claims

1. A quenching and holding furnace for forging, comprising a furnace body (1), a heat exchanger (9) and a heat-insulating water tank (14), characterized in that: A furnace cover (5) is rotatably mounted on the upper end of the furnace body (1), a furnace chamber (3) is arranged in the furnace body (1), the furnace chamber (3) is provided with a heat preservation chamber (6), an induction coil (2) is arranged between the inner wall of the furnace body (1) and the outer wall of the furnace chamber (3), a cooling water inlet pipe (7) and a cooling water outlet pipe (20) are connected to the induction coil (2), one end of the cooling water outlet pipe (20) is connected to the heat exchanger (9), a heating upper water pipe (16) and a heating return water pipe (19) are connected between the heat preservation water tank (14) and the heat exchanger (9), and a circulation pump (16) is arranged on the heating upper water pipe (16). 10), an insulation water inlet pipe (17) and an insulation water return pipe (18) are connected between the insulation water tank (14) and the insulation chamber (6), the insulation water inlet pipe (17) is provided with an inlet pump (22) and an inlet valve (24), the insulation water return pipe (18) is provided with a return pump (21) and a return valve (23), the heat exchanger (9) is connected with a cooling water return pipe (8), the cooling water return pipe (8) and the cooling water outlet pipe (20) are connected through the heat exchanger (9), and the heating water supply pipe (16) and the heating water return pipe (19) are connected through the heat exchanger (9).

2. A quenching and holding furnace for forging according to claim 1, characterized in that: An auxiliary heater (11) and a temperature sensor (25) are installed in the heat preservation chamber (6).

3. A quenching and holding furnace for forging according to claim 1, characterized in that: The upper portion of the heat preservation chamber (6) is connected to an exhaust valve (4).

4. A quenching and holding furnace for forging according to claim 1, characterized in that: The heat-insulating water tank (14) is provided with a vacuum heat-insulating chamber (15).

5. The quenching and holding furnace for forging according to claim 1, characterized in that: The upper end of the thermal insulation water tank (14) is provided with a water inlet (12), one side of the water inlet (12) is connected to a pressure relief valve (13), and the lower end of the water inlet (12) is provided with a filter screen (26).

6. A quenching and holding furnace for forging according to claim 1, characterized in that: The furnace cover (5) is provided with an observation window (5-1).

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