CN114407311A - A bimetallic shell heater - Google Patents

Abstract

The invention discloses a double-metal-tube-shell heater, which relates to the technical field of heating devices and comprises a double-metal tube shell, an opening tubular heater armored heating wire and an outer protection tube; the bimetallic pipe shell is formed by winding a bimetallic sheet, and a low-expansion layer is curled inwards during winding to form a pipe shell of which the inner layer is a passive layer and the outer layer is an active layer; the pipe wall of the open tubular sleeve heater is provided with a through open seam, and the side wall is armored and inlaid with an armored heating wire. After the bimetallic tube shell of the bimetallic tube shell heater is heated, the bimetallic tube shell is curled inwards to shrink because the expansion amount of the active layer on the outer layer of the bimetallic tube shell is larger than that of the passive layer on the inner layer, and the moment of the inward curling and shrinking is applied to the open tubular heater, so that the open tubular heater is also bent inwards to hold a heated body tightly. After the heater cools down, the moment of curling inwards disappears, and the reconversion, the heater need not can easily dismouting with the help of the instrument this moment.

Description

A bimetallic shell heater

technical field

The invention relates to the technical field of heating devices, in particular to a bimetallic shell and tube heater.

Background technique

In the injection molding and die-casting industry and the application of heat preservation and transportation of fluid pipelines, plastics and aluminum alloys need to be melted for injection molding. During the process of injection molding and fluid transportation, the pipeline passages flowing through the mold or equipment require heating elements to melt and keep the material molten. flow state. However, a physical phenomenon that cannot be overcome by the ordinary heating coils currently available in the market is thermal expansion and contraction, that is, after heating, the inner diameter of the heater becomes larger, and the heater loosens from the heated body to form a gap, which changes from contact heat conduction to space. In order to achieve the required temperature, the heater needs to output more power, wastes electric energy, and also makes the heater in a high-load state for a long time, which will shorten the heater's operating time. service life. However, the currently commercially available hoop-type heating coil needs to be locked and fixed with a bolt lock. The bolt lock device occupies a large space, has limited use occasions, and is cumbersome to operate.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a bimetallic shell and tube heater, which overcomes the characteristics of thermal expansion and contraction of traditional heaters, and has the characteristics of reverse bending of cold expansion and thermal contraction, that is, the inner diameter becomes smaller after heating, and the inner diameter after cooling. The characteristic of becoming larger and returning to its original state realizes the inward curling and hooping of the body after heating, which greatly improves the heat conduction efficiency and saves electric energy. No bolt locks are required, saving space. The inner diameter of the bimetal shell and tube heater can be adjusted, which is convenient for installation. After heating, the heated body is fastened, and it returns to its original state after cooling, which is convenient for disassembly and replacement. Since the heater curls and shrinks inwardly, a large machining error can be allowed when turning the heated body, and the heated body does not need to be precisely machined, and the heater can also clamp the heated body, saving the The processing accuracy of the heated body has the beneficial effect of saving processing time, and effectively solves the problems raised in the above-mentioned background art.

To achieve the above object, the present invention provides the following technical solutions:

A bimetallic shell heater, comprising a bimetallic shell, an open tubular heater and an outer protective tube; the bimetallic shell is formed by winding bimetallic sheets, and the passive layer is inward during winding to form a The inner layer of the tube is a passive layer, and the outer layer of the tube is a non-closed tube shell; the bimetallic tube shell is sleeved outside the open tubular heater, the outer protection tube is sleeved outside the bimetallic tube shell, and the sidewall of the open tubular heater is sleeved There is a through opening slot, the side wall of the open tubular heater is engraved and milled, and the armored heating wire and thermocouple are inlaid in the slot; the open tubular heater is made of copper, aluminum or stainless steel; or the slot is engraved and milled with a bimetal plate shape to form a bimetallic tube shell, then the bimetallic tube shell is inlaid with armored heating wires and then wound into a tube shape to form an open tubular heater; The outer tube wall of the tube shell is engraved and milled into a groove shape and then inlaid with armored heating wires to form an open tubular heater. The inner layer is a passive layer, the outer layer is an active layer, and a non-closed shape with a gap is formed at the winding joint of the bimetallic sheet. ;The viewing angle of the end face of the bimetallic tube shell is C-shaped, and the gap at the winding joint is used as the space for inward bending deformation after being heated, or as a reserved space for adjusting the inner diameter and installing thermocouples; the outer protective tube can prevent armoring The heating wire is loosened from the groove, and it also prevents the open heater and the bimetallic tube shell from being overly opened and losing their holding force; according to the operating conditions, when the heater needs to use an external thermocouple, it can be installed on the external protection tube. The hole is used as a through hole for installing an external thermocouple.

As a further solution of the present invention: the open tubular heater is formed by engraving and milling a groove shape on the outer tube wall of a metal pipe, and inlaid with an armored heating wire. It is C-shaped and forms a through slot, which is used to adjust the inner diameter and also as a location for installing thermocouples.

As a further scheme of the present invention: the open tubular heater is engraved and milled with a metal plate in a groove shape, and then inlaid with an armored heating wire, and then wound into a tubular shape, leaving a gap at the winding joint, and the end view is C-shaped. It can be used to adjust the inner diameter of the heater, and it can also be used as the location for installing the thermocouple.

As a further scheme of the present invention: the open tubular heater is engraved and milled a groove shape with a bimetallic plate, and then inlaid with an armored heating wire and then wound into a tubular shape; or the bimetallic plate is wound into a tubular shape, and the outer tube wall is engraved and milled The armored heating wire is inlaid after the groove shape, the inner passive layer and the outer tube layer are active layers, and a gap is formed at the winding joint; The space is also reserved for adjusting the inner diameter and installing thermocouples.

As a further solution of the present invention: the bimetallic tube shell is formed by winding bimetallic sheets. When the sheet is wound, the passive layer is inward and the active layer is outward, and is rolled into a non-closed circular tube. The end view is C-shaped, combined with the outer gap as a reserved space for inward bending and shrinking after being heated.

As a further solution of the present invention: when the base material of the open tubular heater is formed by bimetal winding, the open tubular heater is covered with an outer protective tube.

As a further solution of the present invention, an outer protective sleeve is sleeved on the outer side of the bimetallic tube shell, and the protective sleeve can have a hole, which is used as an installation through hole of an external thermocouple.

Compared with the prior art, the beneficial effects of the present invention are:

The invention overcomes the characteristics of thermal expansion and cold contraction of traditional heaters, and has the characteristics of reverse bending of cold expansion and thermal contraction, that is, the inner diameter becomes smaller after heating, and the inner diameter becomes larger after cooling to restore the original shape, and realizes the characteristics of heating backward. The inner crimping hoops the quilt, which greatly improves the heat conduction efficiency and saves electricity. No bolt locks are required, saving space. The inner diameter of the bimetal shell-and-tube heater can be adjusted when it is cold, which is convenient for installation. Since the heater curls inwardly and shrinks greatly, when turning the heated body, a large processing error can be allowed, and the heated body does not need to be precisely machined. The heater can also clamp the heated body, eliminating the need for heating The processing accuracy of the body is improved, and the beneficial effect of saving processing time is achieved.

Description of drawings

FIG. 1 is a schematic diagram of the structure of the heater of the present invention.

Figure 2 is an exploded view of the heater of the present invention.

FIG. 3 is a schematic view of the structure of the heater of the present invention assembled on the injection nozzle.

FIG. 4 is an exploded view of the heater of the present invention assembled to the injection nozzle.

FIG. 5 is a schematic structural diagram of the radial outlet from the bottom end of the armored heating wire of the heater of the present invention.

FIG. 6 is an exploded view of the heater of FIG. 5 .

FIG. 7 is a schematic structural diagram of an external thermocouple of the heater of the present invention.

FIG. 8 is an exploded view of the heater of FIG. 7 .

FIG. 9 is a schematic structural diagram of the heater of the present invention being elongated and equipped with a thermocouple.

FIG. 10 is an exploded view of the heater of FIG. 9 .

FIG. 11 is a schematic structural diagram of an open tubular heater of the present invention with an upper protection tube and a lower protection tube sleeved on the outer side.

FIG. 12 is an exploded view of the heater of FIG. 11 .

Figure 13 is a side view of an open tubular heater of the heater of the present invention.

Figure 14 is a side view of the bimetallic shell of the heater of the present invention.

Figure 15 is a side view of the heater of the present invention.

FIG. 16 is a cross-sectional view taken along M-M in FIG. 15 .

FIG. 17 is a schematic diagram of the structure of the bimetallic tube shell inlaid heating wire of the heater of the present invention.

Marked in the picture:

1. Bimetallic shell; 2. Open tubular heater; 3. Protection tube; 4. Back cover ring; 5. Upper protection tube; 6. Lower protection tube;

11. Shell opening seam;

21. Tubular heater opening seam; 22. Armored heating wire; 25. Thermocouple; 26. Galvanic hole.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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. 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 protection scope of the present invention.

Please refer to the accompanying drawings 1-17, a bimetallic shell heater, including a bimetallic shell 1, an open tubular heater 2, and a protection tube 3, the bimetallic shell 1 is formed by winding a bimetallic sheet, and the roll When winding, the passive layer is curled inward to form a non-closed tube shell with the inner layer of the tube as the passive layer and the outer layer of the tube as the active layer. It is sleeved outside the open tubular heater 2, the outer protection tube 3 is sleeved on the outside of the bimetallic tube shell 1, the side surface of the open tubular heater 2 is provided with a penetrating tubular heater opening slit 21, and the side surface of the bimetallic tube shell 1 is provided with a tube The shell opening slot 11 and the tubular heater opening slot 21 can be used to adjust the inner diameter size of the opening tubular heater 2 and the thermocouple 25 to be placed in the void. The shell opening slot 11 can be used to adjust the inner diameter size of the bimetal shell 1. The opening tubular heater 2 The side wall is provided with a heating wire groove, and the armored heating wire 22 and the thermocouple 25 are inlaid in the heating wire groove; the outer wall of the open tubular heater 2 is inlaid with the armored heating wire 22 horizontally or vertically, and the density of the armored heating wire 22 is based on the The plastic properties of the heated body are different and arranged; further, the armored heating wire 22 is embedded in the side wall of the open tubular heater 2, not limited to the inner layer or the outer layer; the open tubular heater 2 is made of ordinary copper, aluminum or Made of stainless steel. Or engraving and milling a groove shape with a bimetallic plate to form a bimetallic tube shell 1, and then inlaid the bimetallic tube shell 1 with the armored heating wire 22 and then winding it into a tubular shape to form an open tubular heater 2; or winding the bimetallic plate It is formed into a tubular shape to form a bimetallic tube shell 1. After engraving and milling grooves on the outer tube wall of the bimetallic tube shell 1, the armored heating wire 22 is inlaid to form an open tubular heater 2. The inner layer is a passive layer, and the outer layer is an active layer. layer, a non-closed shape with a gap is formed at the winding joint of the bimetallic sheet; the viewing angle of the end face of the bimetallic tube shell 1 is C-shaped, and the gap at the winding joint is used as a space for inward bending deformation after heating, or for adjusting the inner diameter The size and the reserved space for installing the thermocouple 25; the outer protection tube 3 can prevent the armored heating wire 22 from loosening from the groove, and also prevent the open heater and the bimetal tube shell 1 from being overly opened and losing their holding force; according to According to the working conditions, when the heater needs to use an external thermocouple 25 , a hole can be opened on the external protection tube 3 as a through hole for installing the external thermocouple 25 . The invention overcomes the characteristics of thermal expansion and cold contraction of traditional heaters, and has the characteristics of reverse bending of cold expansion and thermal contraction, that is, the inner diameter becomes smaller after heating, and the inner diameter becomes larger after cooling to restore the original shape, and realizes the characteristics of heating backward. The inner crimping hoops the quilt, which greatly improves the heat conduction efficiency and saves electricity. No bolt locks are required, saving space. The inner diameter of the bimetallic tube shell 1 heater can be adjusted when it is cold, which is convenient for installation. Since the heater curls and shrinks inwardly, a large machining error can be allowed when turning the heated body, and the heated body does not need to be precisely machined. The heater can also clamp the heated body, eliminating the need for heating The processing accuracy of the body is improved, and the beneficial effect of saving processing time. After the bimetallic shell 1 of the heater of the present invention is heated, since the expansion of the outer active layer is greater than that of the inner passive layer, the bimetallic shell 1 will curl and shrink inward, and the inward curling shrinks and deforms. A moment is exerted on the open tubular heater 2 so that the open tubular heater 2 is also bent inward to be tightened by the heating. After the heater cools down, the inward curling moment disappears and returns to its original state. At this time, the heater can be easily disassembled and assembled without tools.

In a preferred embodiment of the present invention, a thermocouple 25 can be embedded in the side wall of the open tubular heater 2, or a thermocouple 25 can be embedded on the heated body, and the thermocouple 25 is used to sense the temperature of the heated body; further, The side surface of the open tubular heater 2 is provided with an opening slit 21 of the tubular heater;

In a preferred embodiment of the present invention, a protection tube 3 is sleeved on the outer side of the bimetallic tube shell 1, and the protection tube 3 has the function of protecting the open tubular heater 2 and limiting the deformation of the bimetallic tube shell 1. 3. The end is provided with a bottom cover ring 4; further, the outer side of the bimetallic tube shell 1 is provided with an upper protection tube 5 and a lower protection tube 6, and the upper protection tube 5 and the lower protection tube 6 are welded; the upper protection tube 5 and the lower protection tube The tube 6 protects the open tubular heater 2 and limits the deformation of the bimetallic tube shell 1 .

In a preferred embodiment of the present invention, the open tubular heater 2 is formed by engraving and milling a groove shape on the outer tube wall of a metal pipe, and inlaying the armored heating wire 22. When the groove shape is engraved and milled, the metal pipe is broken open, and the end view is It is C-shaped and forms a through slot, which is used for adjusting the inner diameter and also as a location for installing the thermocouple 25 .

In a preferred embodiment of the present invention, the open tubular heater 2 is engraved and milled with a metal plate in a groove shape, and then inlaid with the armored heating wire 22, and then wound into a tubular shape, leaving a gap at the winding joint, and the end view is C-shaped. This gap is used for adjusting the inner diameter of the heater and also as a position for installing the thermocouple 25 .

In a preferred embodiment of the present invention, the open tubular heater 2 is engraved and milled into a groove shape with a bimetallic plate, and then inlaid with an armored heating wire 22 and then wound into a tubular shape; or the bimetallic plate is wound into a tubular shape, and the outer tube wall is The armored heating wire 22 is inlaid with the upper engraving and milling groove shape, the inner passive layer and the outer layer of the tube are active layers, and a non-closed shape with a gap is formed at the winding junction; The space for inner bending deformation is also used as a reserved space for adjusting the size of the inner diameter and installing the thermocouple 25 .

In a preferred embodiment of the present invention, the bimetallic tube shell 1 is formed by winding a bimetallic sheet. When the sheet is wound, the passive layer is inward and the active layer is outward, and it is rolled into a non-closed circular tube. It is C-shaped, and the outer gap is used as a reserved space for inward bending and shrinking after being heated.

For a preferred embodiment of the present invention, please refer to FIGS. 7 and 8 . In the embodiment of the present invention, the thermocouple 25 can be placed externally. One end of the thermocouple 25 passes through the galvanic hole 26 of the protection tube 3 and is fixed to the protection tube. On the outside of 3, the upper part of the protection tube 3 is provided with a gasket for fixing the thermocouple 25.

After the bimetallic tube shell 1 of the heater of the present invention is heated, the expansion of the outer metal layer of the tube is greater than that of the inner layer of the tube, so that the bimetallic tube shell 1 will curl and shrink inward, and the inward curling and shrinking deformation torque is applied On the open tubular heater 2 , the open tubular heater 2 is also bent inward, and the open tubular heater 2 is tightly hugged to the object to be heated. After the heater cools down, the inward curling moment disappears and returns to its original state. At this time, the open heater can be easily disassembled and assembled without tools.

Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it is still possible to modify the technical solutions described in the foregoing embodiments, or to perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (7)

1. A bimetal tube shell heater is characterized by comprising a bimetal tube shell, an opening tubular heater and an outer protection tube; the bimetallic pipe shell is formed by winding a bimetallic sheet, and a passive layer is inward during winding to form a non-closed pipe shell with a pipe inner layer as a passive layer and a pipe outer layer as an active layer; the bimetallic tube shell is sleeved outside the open tubular heater, the outer protection tube is sleeved outside the bimetallic tube shell, the side wall of the open tubular heater is provided with a through open seam, the side wall of the open tubular heater is carved and milled in a groove shape, and an armored heating wire and a thermocouple are embedded in the groove; the open tubular heater is made of copper, aluminum or stainless steel; or a bimetallic plate is used for engraving and milling a groove shape to form a bimetallic tube shell, and the bimetallic tube shell is embedded with an armored heating wire and then is wound into a tubular shape to form an open tubular heater; or the bimetallic plate is coiled into a tubular shape to form a bimetallic tube shell, the outer tube wall of the bimetallic tube shell is carved and milled in a groove shape and then is embedded with an armored heating wire to form an open tubular heater, the inner layer of the open tubular heater is a passive layer, the outer layer of the open tubular heater is an active layer, and the coiled joint of the bimetallic plate is in a non-closed shape with a gap; the end surface visual angle of the bimetallic tube shell is C-shaped, and a gap at the winding joint is used as a space for inward bending deformation after being heated or used as a reserved space for adjusting the inner diameter and installing a thermocouple; the outer protection tube can prevent the armored heating wire from loosening from the groove and prevent the opening heater and the bimetallic tube shell from being excessively opened to lose the holding force; according to the working condition of use needs, when the heater needs to use external thermocouple, can open a hole on outer protection tube, be used as the through hole of installation external thermocouple.

2. A bimetallic cartridge heater as in claim 1, wherein the open tubular heater is formed by engraving a metal tube into a groove shape in the outer wall of the tubular heater, and inserting the sheathed heater wire, wherein the bimetallic cartridge is broken when the groove is engraved, and the end face has a C-shape in view to form a through gap which is used for adjusting the inside diameter and also as a position for installing a thermocouple.

3. A bimetallic cartridge heater as in claim 1, wherein the open tubular heater is formed by engraving a metal plate into a groove shape, inserting an armoured heater wire, and winding into a tubular shape with a gap left at the winding junction, the end view being C-shaped, the gap serving as a location for adjusting the inside diameter of the heater and also serving as a location for installing a thermocouple.

4. A bimetallic cartridge heater as in claim 1, wherein the open tubular heater is formed by engraving and milling a bimetallic strip into a groove shape, embedding an armoured heater wire and then winding the bimetallic strip into a tubular shape; or the bimetallic plate is coiled into a tubular shape, the outer pipe wall is carved and milled in a groove shape and then is embedded with an armored heating wire, the inner passive layer and the outer layer of the bimetallic plate are active layers, and the coiling joint is in a non-closed shape with a gap; the end face visual angle is C-shaped, and the gap is used as a space which is bent and deformed inwards after being heated and also used as a reserved space for adjusting the inner diameter and installing a thermocouple.

5. A bimetallic tube shell heater as in claim 1, wherein the bimetallic tube shell is formed by coiling a bimetallic strip with the passive layer facing inward and the active layer facing outward to form a non-closed circular tube with the end view in C-shape and the outer gap acting as a pre-space for inward bending and contraction after heating.

6. A bimetallic cartridge heater as in claim 1, wherein the open tubular heater body is sheathed with an outer protective tube when the open tubular heater substrate is formed by bimetallic coiling.

7. A bimetallic cartridge heater as in claim 1, wherein the bimetallic cartridge is externally sheathed with an outer protective sleeve which is apertured for mounting an external thermocouple through the aperture.

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