Mounting structure of immersion heater to heating furnace

Abstract

To provide a structure for mounting an immersion heater to a heating furnace, which allows the heater to be easily installed in the heating furnace, is not easily removed, and has no risk of damaging a protective tube of the heater. [Solution] An engagement groove 1 is provided in an appropriate position on the top of an immersion heater A, and a number of separated spacers 2, 2 are engaged in this engagement groove 1 with the outer periphery of the spacers 2, 2 protruding outward from the engagement groove 1. A retaining tube 3 with an inner diameter roughly matching the outer diameter of the immersion heater A is provided facing inward at an appropriate position in a heating furnace B, and a fixed tube 4 with an inner diameter slightly larger than the outer diameter of the immersion heater A is provided facing outward. The immersion heater A is inserted into this retaining tube 3, and the parts of the spacers 2, 2 engaged in the engagement groove 1 that protrude beyond the engagement groove 1 are engaged with the upper edge 31 of the retaining tube 3.

Description

[Technical field]

[0001] This invention relates to an improvement in the mounting structure of an immersion heater A, which has a cartridge heater 2, preferably retractably arranged inside a protective cylinder 1 made of a highly thermally conductive ceramic material such as ceramics mainly made of silicon nitride or silicon carbide, in a heating furnace. [Background technology]

[0002] Up until now, immersion heaters have generally been attached to heating furnaces by providing a fixed cylinder 4 with an inner diameter slightly larger than the outer diameter of the immersion heater A in an appropriate position in heating furnace B, as shown in Figure 5, then inserting the lower part of the immersion heater A through this fixed cylinder 4, and screwing fixing screws 18, which have been screwed into multiple places in the fixed cylinder 4, into the upper end of the immersion heater A to secure it, and at this time, the immersion heater A is fixed by engaging the tips of the fixing screws 18 with grooves 11 provided on the upper end of the immersion heater A. Figure 6 is a schematic diagram of an example of installing immersion heater A in heating furnace B.

[0003] However, with this type of heater, aligning the fixing screws 18 is troublesome, and if they are not tightened properly, they will come loose due to vibration during operation, making it easy for the immersion heater A to fall into the heating furnace B. Moreover, if the fixing screws 18 are tightened too much, the outer surface of the immersion heater A, which is generally made of ceramics, can easily be damaged. Furthermore, if the fixing screws 18 are removed, the immersion heater A will no longer have a hook, so there is a risk that it will accidentally fall into the heating furnace B. Summary of the Invention [Problem to be solved by the invention]

[0004] The problem that this invention aims to solve is to eliminate these conventional drawbacks and to make it possible to simply and reliably install the immersion heater A in the heating furnace B without damaging the outer surface of the immersion heater A, even if the outer surface is made of ceramics. [Means for solving the problem]

[0005] In this device, as shown in Figure 1, an engagement groove 1 is provided in an appropriate position on the top of an immersion heater A, and a number of separated spacers 2, 2 are engaged in this engagement groove 1 so that the outer periphery of the spacers 2, 2 protrudes outward from the engagement groove 1. This spacer 2 is divided into two or more pieces, which may be independent of each other, or may be connected so as to be rotatable.

[0006] A retaining cylinder 3 with an inner diameter roughly matching the outer diameter of the immersion heater A is installed facing inward at appropriate locations on the top, side, etc. of the heating furnace B, and the heat-generating part of the immersion heater A is inserted into this retaining cylinder 3 from the outside, such as above and from the side.

[0007] Corresponding to the holding tube 3, a fixed tube 4 having an inner diameter larger than that of the holding tube 3 is extended outwardly, such as upward or to the side, in a substantially concentric state.

[0008] Here, the spacers 2, 2 engaged with the locking groove 1 have a dimension equivalent to the outer diameter of the portion protruding from the locking groove 1 that is thicker than the inner diameter of the retaining tube 3 and thinner than the inner diameter of the fixed tube 4, so that the lower ends of the spacers 2, 2 are locked to the upper edge 31 of the retaining tube 3.

[0009] Furthermore, if necessary, a fixing screw 8 can be screwed into the tip of the fixed cylinder 4, and its tip can lock the outer tip of the protective tube 9 of the immersion heater A, preventing the immersion heater A from falling out to the outside.

[0010] Figure 1 shows immersion heater A mounted in heating furnace B, but to remove it, loosen the fixing screws 8 and lift immersion heater A upward as shown in Figure 2. When this is done, the spacers 2,2 fitted into the retaining part 1 can move freely and can be removed outward from the retaining part 1 as shown in Figure 3. Figure 4 shows the state of the spacers 2,2 when split in two. When installing, immersion heater A can be fixed to heating furnace B by reversing the procedure above. Effect of the Invention

[0011] As described above, in this device, when the immersion heater A is attached to the heating furnace B, the locking groove 1 is engaged with the upper edge 31 of the retaining tube 3, and the portion of the spacer 2, 2 which is divided into several pieces circumferentially and protrudes outward from the locking groove 1. This makes it easy to install and remove the immersion heater A from the heating furnace B, and once installed it will not come loose. Also, there is no risk of the protective tube of the immersion heater A being damaged by over-tightening the screws, as was the case in the past, which contributes to safe operation.

[0012] Furthermore, if there is a fixing screw 8, even if it is loosened, the spacers 2, 2 are still fitted into the retaining portion 1, so there is no risk of the immersion heater A falling into the heating furnace B as in the conventional case, and it can be safely pulled out. [Brief description of the drawings]

[0013] [Figure 1] 1 is a schematic cross-sectional view of one embodiment of the present invention and a cross-sectional view taken along line XX. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] 1 is a schematic cross-sectional view of a conventional example and a cross-sectional view taken along line YY. [Figure 6] Schematic diagram of an example of an immersion heater installed in a heating furnace. [Explanation of symbols]

[0014] 1 is a locking groove, 2 is a spacer, 3 is a retaining tube, 31 is its upper edge, 4 is a fixed tube, A is an immersion heater, and B is a heating furnace.

Claims

[Claim 1] A locking groove 1 is provided at an appropriate position on the upper part of the immersion heater A, and a plurality of separated spacers 2, 2 are locked in the locking groove 1 so that the outer periphery of the spacers 2, 2 protrudes outward from the locking groove 1. A retaining cylinder 3 having an inner diameter substantially equal to the outer diameter of the immersion heater A is provided at an appropriate position of the heating furnace B facing inward, and a fixed cylinder 4 having an inner diameter slightly larger than the outer diameter of the immersion heater A is provided facing outward. The immersion heater A is inserted into the retaining cylinder 3, and the portions of the spacers 2, 2 engaged with the retaining groove 1 that protrude beyond the retaining groove 1 are engaged with the upper edge 31 of the retaining cylinder 3, thereby forming a mounting structure for the immersion heater in the heating furnace.

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