Graphite heating device for vacuum sintering furnace

Abstract

The utility model relates to a graphite heating device for a vacuum sintering furnace, which comprises a cuboid graphite heater, a cuboid heater outer frame and a cuboid furnace tube, the heater outer frame and the cuboid furnace tube are fixedly arranged in a hearth of the vacuum furnace, and the graphite heater is arranged between the heater outer frame and the cuboid furnace tube; the graphite heater is of an integrated structure, a penetrating groove is formed in the graphite heater in the length direction of the hearth, an annular groove perpendicular to the length direction of the hearth is formed in the graphite heater, only one end of the annular groove is communicated with the penetrating groove, and the portions, on the two sides of the annular groove, of the graphite heater are symmetrically arranged. Electrodes are fixedly arranged on the graphite heater and located on the two sides of the end of a penetrating groove communicated with the annular groove, and a channel is formed between the two electrodes through the graphite heater. The cuboid graphite heater can effectively improve the space utilization rate of a heating area, the heater outer frame and the furnace tube provide effective protection for the graphite heater, and the integrated graphite heating body is good in thermal shock resistance and electric shock resistance, uniform in heating and long in service life.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum furnaces, in particular to a graphite heating device for a vacuum sintering furnace. Background Art

[0002] A vacuum sintering furnace using a graphite heater is an advanced heat treatment device. Its characteristics lie in using graphite as a heating element to perform sintering heat treatment on materials in a vacuum environment. The graphite heater works by using the thermal effect of resistance. When high-frequency current passes through the graphite conductive material, due to the resistance of the conductive material, the current will be converted into heat energy, thereby raising the temperature of the graphite conductive material and the materials around it; Graphite has excellent electrical conductivity and thermal stability, maintains stable physical and chemical properties at high temperatures, can transfer heat quickly and evenly, and can be easily processed into various shapes and sizes according to needs.

[0003] For example, Chinese Utility Model Patent CN202223011624.2 discloses a graphite ring heating element for a vacuum furnace. The graphite ring heating element with an integrated structure is used, with less waste of graphite material, low manufacturing cost, simple structure of the heating element, few connection points, reducing the influence of thermal shock and electrical shock on the heating element; It is applicable to the cavity of a horizontal vacuum furnace and can provide a uniform transverse temperature.

[0004] However, the above-mentioned disclosed document still has certain defects. One is that the space utilization rate of the internal heating area of the cylindrical graphite heating element is not as good as that of the cuboid-shaped graphite heating element. In the use of a vacuum sintering furnace, it is manifested that a higher-power vacuum pumping device and stronger heating power are required to maintain the vacuum degree and high temperature, resulting in unnecessary resource waste; The other is the structure of the integrated graphite heating element. Due to its structural characteristics and damage caused by bumps, once damaged, the entire graphite heating element needs to be replaced. During the use of a vacuum sintering furnace, when loading products to be sintered at high temperature into the furnace chamber and taking out the sintered products from the furnace chamber, if not careful, it is very easy to hit or rub against the graphite heating element, and in severe cases, the heating element will be damaged. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a graphite heating device for a vacuum sintering furnace to solve the above problems existing in the prior art.

[0006] To solve the above problems, the present utility model provides a graphite heating device for a vacuum sintering furnace, which includes a graphite heater, a heater outer frame, and a furnace tube, all of which are rectangular parallelepipeds. The heater outer frame and the furnace tube are fixedly arranged in the vacuum furnace hearth, and the graphite heater is arranged between the heater outer frame and the furnace tube; the graphite heater is of an integral structure, and a through groove is provided along the length direction of the hearth on the graphite heater. A ring groove perpendicular to the length direction of the hearth is provided on the graphite heater. Only one end of the ring groove communicates with the through groove, and the graphite heaters on both sides of the ring groove are symmetrically arranged. Electrodes are fixedly provided on both sides of the end of the through groove communicating with the ring groove on the graphite heater, and a path is formed between the two electrodes through the graphite heater.

[0007] The graphite heating device for a vacuum sintering furnace provided by the present utility model also has the following technical features:

[0008] Further, the electrodes are fixedly installed in the mounting plates integrally provided on the outer wall of the graphite heater; graphite plates are fixedly provided at the ends of the electrodes, and mounting grooves are provided in the mounting plates, and the graphite plates are embedded in the mounting grooves.

[0009] Further, the width of the path is consistent.

[0010] Further, a single such path is provided on the graphite heater.

[0011] Further, partition grooves parallel to the ring groove are also provided on the graphite heater, and the partition grooves are symmetrically arranged on both sides of the ring groove, and both ends of the partition grooves do not communicate with the through groove.

[0012] Further, both ends of the through groove and the ring groove are on the same side wall of the graphite heater.

[0013] Further, the heater outer frame includes four groups of support angle frames and connecting rods, and the four corners of the graphite heater abut against the support angle frames.

[0014] Further, the heater outer frame further includes two support rings fixedly provided at both ends thereof, and the inner walls of the support rings abut against the outer walls of the furnace tube.

[0015] Further, one or more graphite heaters are provided in the heater outer frame, and the heater outer frame is provided in one or more groups.

[0016] Further, a furnace bed is also fixedly provided in the inner cavity of the furnace tube, and the support feet of the furnace bed are fixedly connected to the hearth. The support feet are provided on the outer sides of both end faces of the heater outer frame, and the support feet penetrate through the furnace tube.

[0017] The utility model has the following beneficial effects: the cuboid graphite heater, the heater outer frame and the furnace tube can effectively improve the space utilization rate of the internal heating area of the graphite heater; the heater outer frame and the furnace tube provide effective protection for the graphite heater, preventing the graphite heating element from being knocked during the process of loading the products to be sintered at high temperature into the furnace chamber and taking out the sintered products from the furnace chamber; separating the graphite heater and the products with the furnace tube can effectively improve the vacuum pumping efficiency in the furnace tube cavity; the integrated graphite heating element has good thermal shock resistance and electric shock resistance, uniform heating and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 FIG. is a schematic diagram of the structure of the furnace tube of the utility model;

[0020] Figure 3 FIG. is a schematic diagram of the structure of the heater outer frame of the utility model;

[0021] Figure 4 FIG. is a schematic diagram of the structure of the graphite heater of one embodiment of the utility model;

[0022] Figure 5 is Figure 4 the upward view angle of

[0023] Figure 6 FIG. is a schematic diagram of the structure of the graphite heater of another embodiment of the utility model;

[0024] Figure 7 FIG. is a schematic diagram of the structure of the graphite heater of another embodiment of the utility model.

[0025] In the figure, the reference numerals are:

[0026] Graphite heater 1; through groove 11; annular groove 12; partition groove 13; electrode 14; graphite plate 141; mounting plate 15; mounting groove 151;

[0027] Heater outer frame 2; support angle frame 21; connecting rod 22; support ring 23;

[0028] Furnace tube 3; furnace bed 31; support feet 32. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The utility model will be described in detail below with reference to the drawings and in conjunction with the embodiments. It should be noted that, without conflict, the embodiments in the utility model and the features in the embodiments can be combined with each other.

[0030] As Figures 1 to 7In the embodiment of the graphite heating device for a vacuum sintering furnace of the present utility model shown, the graphite heating device for the vacuum sintering furnace includes a graphite heater 1, a heater outer frame 2, and a furnace tube 3, all of which are rectangular parallelepipeds. The heater outer frame 2 and the furnace tube 3 are both fixedly arranged inside the vacuum furnace hearth. The graphite heater 1 is arranged between the heater outer frame 2 and the furnace tube 3, that is, the heater outer frame 2, the graphite heater 1, and the furnace tube 3 are arranged in sequence from the outside to the inside. The furnace tube 3 passes through the graphite heater 1 and the heater outer frame 2, and there is a gap between the furnace tube 3 and the graphite heater 1.

[0031] Therefore, based on the above structure, the heater outer frame 2 mainly provides effective support and limitation for the graphite heater 1, while the furnace tube 3 provides effective protection for the graphite heater 1 to prevent the graphite heating element 1 from being bumped during the process of loading products to be sintered at high temperature into the hearth and taking out the sintered products from the hearth.

[0032] Using the rectangular parallelepiped graphite heater 1, heater outer frame 2, and furnace tube 3 can effectively improve the space utilization rate of the internal heating area of the graphite heater 1.

[0033] In addition, separating the graphite heater 1 and the product with the furnace tube 3 can effectively improve the vacuum pumping efficiency in the furnace tube cavity.

[0034] The graphite heater 1 is an integral rectangular parallelepiped cylindrical structure with open ends at both ends. The cross-section of the graphite heater 1 along the length direction of the hearth is rectangular. There is a through groove 11 on the graphite heater 1 along the length direction of the hearth. There is an annular groove 12 on the graphite heater 1 perpendicular to the length direction of the hearth. Only one end of the annular groove 12 communicates with the through groove 11. The graphite heater 1 on both sides of the annular groove 12 is symmetrically arranged. Electrodes 14 are fixedly arranged on both sides of the end of the through groove 11 that communicates with the annular groove 12 on the graphite heater 1. A path is formed between the two electrodes 14 through the graphite heater 1 (that is, a closed circuit is formed between the two electrodes 14).

[0035] Specifically, the path can be referred to as Figure 6 shown by the arrow in. Only one end of the annular groove 12 communicates with the through groove 11, and the other end is at a certain distance from the through groove 11, so that the through groove 11 and the annular groove 12 divide the graphite heater 1 to form a path between the two electrodes 14. In this path, both electrodes 14 are on one side of the through groove 11, and the other side of the opposite through groove 11 is the return circuit.

[0036] The graphite heater 1 arranged in this way can have a good heating path while using an integral structure, and multiple parallel paths can be set between the two electrodes 14 according to the actual situation. Specific examples can be referred to some embodiments given below.

[0037] In an embodiment of the present application, preferably, the electrode 14 is fixedly installed in the mounting plate 15 integrally provided on the outer wall of the graphite heater 1; a graphite plate 141 is fixedly provided at the end of the electrode 14, and a mounting groove 151 is provided in the mounting plate 15, and the graphite plate 141 is embedded in the mounting groove 151; in this way, the contact area between the electrode 14 and the graphite heater 1 can be increased.

[0038] In an embodiment of the present application, preferably, the width of the passage is consistent. When the thickness of the side walls around the graphite heater 1 is equal and the width of the passage also remains consistent, and there is no other interference, the uniformity of heat generation can be ensured.

[0039] In an embodiment of the present application, preferably, the graphite heater 1 is provided with a single such passage, that is Figure 6 As shown in one embodiment of the graphite heater 1, a single passage facilitates the processing, transportation and installation of the graphite heater 1, and certain costs can be saved.

[0040] In an embodiment of the present application, preferably, the graphite heater 1 is provided with multiple such passages, including Figure 4 、 Figure 5 The two parallel-connected passages shown in and Figure 7 The three parallel-connected passages shown in, and the case of more parallel-connected passages. Specifically, a partition groove 13 parallel to the annular groove 12 is further provided on the graphite heater 1. The partition grooves 13 are symmetrically arranged on both sides of the annular groove 12, and both ends of the partition groove 13 are not communicated with the through groove 11; an even number of partition grooves 13 are provided. When two partition grooves 13 are provided, that is Figure 4 、 Figure 5 The two parallel-connected passages shown in; when four partition grooves 13 are provided, that is Figure 7 The three parallel-connected passages shown in, and so on.

[0041] Setting multiple parallel-connected passages can reduce related components (such as electrodes, etc.) to simplify the related installation structure of the vacuum sintering furnace, and can also further ensure the uniformity of heating.

[0042] In an embodiment of the present application, preferably, both ends of the through groove 11 and the annular groove 12 are located on the same side wall of the graphite heater 1. In this way, the graphite heater 1 can have four side corners, thereby increasing the overall structural strength of the graphite heater 1.

[0043] In the above embodiments, preferably, the heater outer frame 2 includes four sets of support angle frames 21 and connecting rods 22. The four corners of the graphite heater 1 abut against the support angle frames 21. On the side of the graphite heater 1 provided with the electrodes 14, only the connecting rods 22 between the two electrodes 14 may be arranged between the two support angle frames 21 to avoid the electrodes 14. Therefore, it is a preferred solution to arrange the side of the graphite heater 1 provided with the electrodes 14 (i.e., the side wall where the two ends of the through groove 11 and the annular groove 12 are located) at the lower end. At this time, the two support angle frames 21 and their connecting rods 22 at the lower end can be arranged in an H-shaped integral structure.

[0044] In the above embodiments, preferably, the heater outer frame 2 further includes two square support rings 23 fixedly arranged at both ends thereof. The inner wall of the support ring 23 abuts against the outer wall of the furnace tube 3. The support ring 23 can further limit the furnace tube 3 to prevent the furnace tube 3 from being knocked against the graphite heater 1 due to its own deformation when the furnace tube 3 is knocked.

[0045] In an embodiment of the present application, preferably, one or more graphite heaters 1 are arranged in the heater outer frame 2, and the heater outer frame 2 is arranged in one or more groups. Since the related accessories of the device have good compatibility, they can be combined according to actual needs.

[0046] In an embodiment of the present application, preferably, a furnace bed 31 is further fixedly arranged in the inner cavity of the furnace tube 3. The support feet 32 of the furnace bed 31 are fixedly connected to the furnace chamber. The support feet 32 are arranged outside the two end faces of the heater outer frame 2, and the support feet 32 penetrate through the furnace tube 3. The furnace bed 31 and its support feet 32 can further protect the graphite heater 1.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A graphite heating device for a vacuum sintering furnace, characterized in that: The invention comprises a graphite heater (1), a heater outer frame (2) and a furnace tube (3), all of which are rectangular parallelepipeds. The heater outer frame (2) and the furnace tube (3) are fixedly arranged in the furnace chamber of a vacuum furnace, and the graphite heater (1) is arranged between the heater outer frame (2) and the furnace tube (3). The graphite heater (1) is an integrated structure. A through groove (11) is arranged on the graphite heater (1) along the length direction of the furnace chamber. An annular groove (12) is arranged on the graphite heater (1) perpendicular to the length direction of the furnace chamber. Only one end of the annular groove (12) is connected to the through groove (11). The graphite heaters (1) on both sides of the annular groove (12) are symmetrically arranged. Electrodes (14) are fixedly arranged on both sides of the end of the through groove (11) connected to the annular groove (12) on the graphite heater (1). A passage is formed between the two electrodes (14) through the graphite heater (1).

2. The graphite heating device for a vacuum sintering furnace according to claim 1, characterized in that: The electrode (14) is fixedly mounted in a mounting plate (15) integrally provided on the outer wall of the graphite heater (1); a graphite plate (141) is fixedly mounted at the end of the electrode (14), a mounting groove (151) is provided in the mounting plate (15), and the graphite plate (141) is embedded in the mounting groove (151).

3. The graphite heating device for a vacuum sintering furnace according to claim 2, characterized in that: The passages are of uniform width.

4. The graphite heating device for a vacuum sintering furnace according to claim 3, characterized in that: The graphite heater (1) is provided with a single passage.

5. The graphite heating device for vacuum sintering furnace according to claim 3, characterized in that: The graphite heater (1) is also provided with a partition groove (13) parallel to the annular groove (12). The partition grooves (13) are symmetrically arranged on both sides of the annular groove (12). Both ends of the partition groove (13) are not connected to the through groove (11).

6. The graphite heating device for a vacuum sintering furnace according to any one of claims 1 to 5, characterized in that: Both ends of the through groove (11) and the annular groove (12) are located on the same side wall of the graphite heater (1).

7. The graphite heating device for a vacuum sintering furnace according to claim 6, characterized in that: The heater outer frame (2) comprises four groups of supporting angle frames (21) and connecting rods (22), and the four corners of the graphite heater (1) are in contact with the supporting angle frames (21).

8. The graphite heating device for a vacuum sintering furnace according to claim 7, characterized in that: The heater outer frame (2) further comprises two support rings (23) fixedly arranged at both end portions thereof, and the inner walls of the support rings (23) are in contact with the outer wall of the furnace tube (3).

9. The graphite heating device for a vacuum sintering furnace according to claim 8, characterized in that: A single or multiple graphite heaters (1) are arranged inside the heater outer frame (2), and the heater outer frame (2) is arranged in a single group or multiple groups.

10. The graphite heating device for a vacuum sintering furnace according to claim 9, characterized in that: A furnace bed (31) is also fixedly provided in the inner cavity of the furnace tube (3). Support legs (32) of the furnace bed (31) are fixedly connected to the furnace chamber. The support legs (32) are arranged on the outer sides of both end surfaces of the heater outer frame (2). The support legs (32) penetrate the furnace tube (3).

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