Cooling device for front door of vacuum nitriding furnace

Abstract

The utility model discloses a front door cooling device of a vacuum nitriding furnace, which particularly relates to the field of nitriding furnace cooling structures, and comprises a furnace shell and a front door which are hinged, cooling jackets and sealing rings are uniformly distributed on the furnace shell and the front door, runners are arranged in the two cooling jackets, and the runners are externally connected with a pump. The pump machine, the flow channel and the tank body used for storing cooling liquid form a circulation loop, and the pump machine is electrically connected with the controller. And the heater is used for heating the cooling liquid and keeping the temperature of the cooling liquid below 80 DEG C while the temperature of the cooling liquid exceeds the crystallization temperature of ammonium bicarbonate. According to the invention, a reasonable temperature control system is designed to control the temperature of the circulating cooling liquid in the cooling jacket, so that the temperature of the cooling liquid is in a proper range; ammonia bicarbonate crystallization caused by too low cooling liquid temperature or unobvious cooling effect caused by too high cooling liquid temperature are prevented, and the service life of the whole equipment is prolonged while the overall cooling efficiency is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of nitriding furnace cooling structures, and more specifically, to a vacuum nitriding furnace front door cooling device. Background Art

[0002] The front door of the vacuum nitriding furnace is usually sealed with a rubber seal. To prevent the front door from overheating and damaging the seal, cooling jackets are installed on the front flange of the furnace shell and the furnace door. Cooling water is continuously supplied to the cooling jacket to maintain the temperature of the seal.

[0003] However, during the production process of the vacuum nitriding furnace, because the temperature of the cooling water is too low, ammonium bicarbonate crystals will appear in the nitriding furnace. The crystals accumulate in the narrow parts of the pipes or heat exchangers, causing blockages, affecting the normal heat exchange efficiency, and even completely blocking the flow channel, which will also affect the service life of the equipment. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a vacuum nitriding furnace front door cooling device. The technical problem to be solved by the present invention is: how to reduce the precipitation rate of ammonium bicarbonate crystals during the cooling process of the furnace door.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a vacuum nitriding furnace front door cooling device, comprising a furnace shell and a front door, which are hinged, and cooling jackets and sealing rings are provided on the furnace shell and the front door. Flow channels are provided in the two cooling jackets, and the flow channels are externally connected to a pump. The pump, the flow channels and a tank for storing coolant form a circulation loop, and the pump and the controller are electrically connected; a heater is used to heat the coolant and keep the temperature of the coolant below 80°C while exceeding the crystallization temperature of ammonium bicarbonate.

[0006] In a preferred embodiment, the coolant is one of mineral oil, high-temperature thermal oil, and ester oil.

[0007] In a preferred embodiment, the cooling device further comprises a heat exchanger for reducing the temperature of the coolant flowing out of the flow channel, and the heat exchanger is electrically connected to the controller.

[0008] In a preferred embodiment, the cooling device further comprises a temperature sensor for real-time monitoring of the temperature of the coolant, and the temperature sensor is electrically connected to the controller.

[0009] In a preferred embodiment, the temperature sensor is a thermocouple.

[0010] Technical effects and advantages of this utility model:

[0011] This application designs a reasonable temperature control system to control the temperature of the coolant circulating in the cooling jacket, so that the temperature of the coolant is within an appropriate range, preventing the coolant temperature from being too low to cause ammonium bicarbonate crystallization or too high to make the cooling effect insignificant, thereby ensuring the overall cooling efficiency and extending the service life of the entire equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the present invention. The embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0013] Figure 1 This is a structural diagram of the front door cooling device of the vacuum nitriding furnace in this utility model.

[0014] Figure 2 for Figure 1 A magnified view of center.

[0015] Figure 3 It is a side view of the heat exchanger in the present utility model.

[0016] Figure 4 It is the front view of the heat exchanger in the present utility model.

[0017] The figures are marked as follows: 1. furnace shell; 101. shell jacket inlet; 102. shell jacket outlet; 2. front door; 201. door jacket inlet; 202. door jacket outlet; 3. heater; 4. heat exchanger; 5. temperature sensor. DETAILED DESCRIPTION

[0018] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that the description of this disclosure will be more comprehensive and complete, and will fully convey the concepts of the example embodiments to those skilled in the art. The accompanying drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. Identical reference numerals in the figures indicate identical or similar parts, and thus repeated descriptions thereof will be omitted.

[0019] In addition, the described features, structures or characteristics can be combined in any suitable manner in one or more example embodiments. In the following description, many specific details are provided to provide a full understanding of the example embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure can be practiced while omitting one or more of the specific details, or other methods, components, steps, etc. can be adopted. In other cases, well-known structures, methods, implementations or operations are not shown or described in detail to avoid obscuring various aspects of the present disclosure.

[0020] Example

[0021] A vacuum nitriding furnace front door cooling device comprises a furnace shell 1 and a front door 2, wherein one side of the front door 2 is hinged to the furnace shell 1 so that the front door 2 can be opened or closed relative to the furnace shell 1.

[0022] A flange is connected to the furnace shell 1, and both the flange and the front door 2 are provided with a stepped surface that allows the front door 2 to be embedded in the furnace shell. Sealing rings are fixed on the flange and the front door 2 to ensure airtightness between the furnace shell 1 and the front door 2 when the front door 2 is closed.

[0023] A cooling jacket is fixed on the flange of the furnace shell 1 and the front door 2. A shell jacket inlet 101 and a shell jacket outlet 102 are provided on the flange, and a door jacket inlet 201 and a door jacket outlet 202 are provided on the front door 2. A flow channel is opened in the cooling jacket and filled with coolant. By allowing the coolant with a lower temperature to flow in the flow channel, the temperature around the sealing ring is reduced, thereby achieving the cooling purpose.

[0024] The two ends of the two flow channels, namely the shell inlet 101 and the shell outlet 102, and the door inlet 201 and the door outlet 202 are respectively connected to the corresponding pumps, and the pumps are also connected to the oil tank filled with coolant. The pumps are used to continuously input the coolant in the tank into the cooling jacket for continuous cooling operation.

[0025] Furthermore, a heater 3, a heat exchanger 4 and a temperature sensor 5, all electrically connected to the controller, are provided on the circulation loop of the flow channel, the tank and the pump to further regulate the temperature of the coolant.

[0026] The heater 3 is a strip heater or a tubular heater. The heater 3 heats the coolant before entering the cooling jacket to a specified temperature range, that is, the temperature of the coolant exceeds the crystallization temperature of ammonium bicarbonate while being maintained below 80°C. In addition, especially when started in a low temperature environment, the heater 3 can quickly increase the temperature of the coolant.

[0027] The heat exchanger 4 is a plate heat exchanger or a shell and tube heat exchanger, and is used to cool the reflux coolant. When the coolant passes through the heat exchanger 4, its temperature is reduced to ensure that it does not overheat when circulating back into the cooling jacket.

[0028] The temperature sensor 5 is a thermocouple, and its model may be, for example, Omega TT-K-30-72-A-1 or TP-200-J. The temperature sensor 5 is used to monitor the temperature of the coolant in real time. It can detect the temperature of the coolant at different positions to ensure that the temperature is controlled within the required range.

[0029] It is known that the coolant can be a high-temperature resistant oil such as mineral oil, high-temperature thermal oil, ester oil, etc. This embodiment is only an example and does not have a limiting effect.

[0030] This application mainly controls the temperature of the coolant circulating in the cooling jacket by designing a reasonable temperature control system, so that the temperature of the coolant is within an appropriate range, preventing the coolant temperature from being too low to cause ammonium bicarbonate crystallization or too high to make the cooling effect insignificant, thereby ensuring the overall cooling efficiency and extending the service life of the entire equipment.

[0031] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

[0032] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense, and may refer to mechanical or electrical connections, internal communication between two components, or direct connection. "Up," "down," "left," and "right" are only used to indicate relative positional relationships. When the absolute positions of the objects being described change, the relative positional relationships may also change.

[0033] Secondly: The drawings of the embodiments disclosed in this utility model only involve structures related to the embodiments disclosed in this utility model. Other structures can refer to common designs. In the absence of conflicts, the same embodiment and different embodiments of the utility model can be combined with each other.

[0034] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, 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 vacuum nitriding furnace front door cooling device, characterized in that: include: The furnace shell (1) and the front door (2) are hingedly connected. The furnace shell (1) and the front door (2) are both provided with cooling jackets and sealing rings. A flow channel is provided in each of the two cooling jackets. The flow channel is externally connected to a pump. The pump, the flow channel, and a tank for storing coolant form a circulation loop. The pump and the controller are electrically connected. The heater (3) is used to heat the coolant and keep the temperature of the coolant below 80° C. while exceeding the crystallization temperature of ammonium bicarbonate.

2. The vacuum nitriding furnace front door cooling device according to claim 1, characterized in that: The coolant is one of mineral oil, high-temperature heat-conducting oil, and ester oil.

3. The vacuum nitriding furnace front door cooling device according to claim 1, characterized in that: The cooling device further comprises a heat exchanger (4) for reducing the temperature of the cooling liquid flowing out of the flow channel, and the heat exchanger (4) is electrically connected to the controller.

4. The vacuum nitriding furnace front door cooling device according to claim 1, characterized in that: The cooling device further comprises a temperature sensor (5) for real-time monitoring of the temperature of the cooling liquid, and the temperature sensor (5) is electrically connected to the controller.

5. The vacuum nitriding furnace front door cooling device according to claim 4, characterized in that: The temperature sensor (5) is a thermocouple.

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