# US 10,770,318 B2 · High temperature tubular heaters

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- Number: US 10,770,318 B2
- Document ID: US10770318B2
- Status: Granted
- Kind: B2
- Application number: 15/260,357
- Filed: 2016-09-09
- Published: 2017-03-09
- Granted: 2020-09-08
- Earliest claimed: 2015-09-09
- Assignees: Watlow Electric Manufacturing Company
- Applicants: Watlow Electric Manufacturing Company
- Inventors: Mohammad Nosrati; Roger Brummell; Kenneth D. Ames; Paul S. Whetstone
- Web page: https://patentgrep.com/patent/US10770318B2

## CPC

- H10P 72/0434: {mainly by convection}
- C01B 21/072: with aluminium
- C01F 5/02: Magnesia
- C01F 7/02: Aluminium oxide; Aluminium hydroxide; Aluminates
- C01G 25/02: Oxides
- C04B 37/021: {in a direct manner, e.g. direct copper bonding [DCB]}
- H05B 3/42: non-flexible
- H10P 72/0436: {mainly by radiation}
- C01P 2006/40: Electric properties
- C04B 2237/345: Refractory metal oxides
- C04B 2237/363: Carbon
- C04B 2237/40: Metallic
- H05B 2203/016: Heaters using particular connecting means
- H10P: GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C01F: COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts of peroxyacids C01B15/00; sulfides or polysulfides of magnesium, calcium, strontium, or barium C01B17/42; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds other than ammonia or cyanogen containing nitrogen and non-metals and optionally metals C01B21/082; amides or imides of silicon C01B21/087}; metal {imides or} amides C01B21/092, {C01B21/0923}; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanic acid C01C3/14; salts of cyanamide C01C3/16; thiocyanates C01C3/20; {double sulfates of magnesium with sodium or potassium C01D5/12; with other alkali metals C01D15/00, C01D17/00})
- C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20)
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

A heater assembly includes a heating member, a mounting member that mounts the heating member to a wall of an external component, and an insulator disposed between the heating member and the wall. The insulator electrically insulates the heating member from the wall and blocks a ground path from the heating member to the wall of the external component.

## Claims

### Claim 1

A heater assembly, comprising:
a heating member comprising a resistive element and a dielectric material surrounding and electrically insulating the resistive element;
a mounting member that mounts the heating member to a wall of an external component; and
an insulator disposed between the heating member and the wall of the external component and electrically insulates the heating member from the wall and blocks a ground path from the heating member to the wall of the external component,
wherein the resistive element is electrically insulated by both the dielectric material and the insulator during normal operation of the heating member, and the resistive element remains electrically insulated by the insulator during a dielectric breakdown of the dielectric material due to the ground path from the resistive element to the wall of the external component being blocked by the insulator.

### Claim 2 (depends on 1)

The heater assembly according to claim 1, wherein the heating member is a tubular heater.

### Claim 3 (depends on 1)

The heater assembly according to claim 1, wherein the heating member further comprises a metal sheath surrounding the dielectric material and the resistive element.

### Claim 4 (depends on 3)

The heater assembly according to claim 3, wherein the insulator electrically insulates the metal sheath from the wall of the external component.

### Claim 5 (depends on 4)

The heater assembly according to claim 4, wherein the metal sheath terminates at one end surface of the insulator.

### Claim 6 (depends on 3)

The heater assembly according to claim 3, further comprising terminal pins extending through the insulator and connected to the resistive element.

### Claim 7 (depends on 3)

The heater assembly according to claim 3, wherein the heating member further includes an impervious coating on an outer surface of the metal sheath.

### Claim 8 (depends on 7)

The heater assembly according to claim 7, wherein the impervious coating has an emissivity in the range of 0.8 to 1.

### Claim 9 (depends on 7)

The heater assembly according to claim 7, wherein the impervious coating includes a material selected from a group consisting of graphite, composite materials, oxide materials, and nickel-chromium-magnesium oxide.

### Claim 10 (depends on 4)

The heater assembly according to claim 4, wherein the dielectric material is selected from a group consisting of magnesium oxide (MgO), aluminum oxide (Al2O3), zirconium oxide (ZrO2), and aluminum nitride (AlN).

### Claim 11

A heater assembly comprising:
a heating element;
a metal sheath surrounding the heating element;
a dielectric material disposed between the heating element and the metal sheath; and
a coating disposed around the metal sheath,
wherein the coating includes an impervious material.

### Claim 12 (depends on 11)

The heater assembly according to claim 11, further comprising an insulator that electrically insulates the metal sheath from an external component to which the heater assembly is mounted.

### Claim 13 (depends on 12)

The heater assembly according to claim 12, wherein the metal sheath abuts against one end surface of the insulator.

### Claim 14 (depends on 11)

The heater assembly according to claim 11, wherein the dielectric material has a thermal conductivity between 60-180 W/m K.

### Claim 15 (depends on 14)

The heater assembly according to claim 14, wherein the dielectric material is aluminum nitride (AlN).

### Claim 16 (depends on 12)

The heater assembly of claim 12, further comprising a termination pin connected to the resistive element and extending through the insulator.

### Claim 17 (depends on 11)

The heater assembly according to claim 11, wherein the impervious material has an emissivity in the range of 0.8 to 1.

### Claim 18 (depends on 11)

The heater assembly according to claim 11, wherein the impervious material is selected from a group consisting of graphite, composite materials, oxide materials, and nickel-chromium-magnesium oxide.

### Claim 19 (depends on 11)

The heater assembly according to claim 11, wherein the dielectric material is selected from a group consisting of magnesium oxide (MgO), zirconium oxide (ZrO2), aluminum oxide (Al2O3), and aluminum nitride (AlN).

### Claim 20 (depends on 11)

The heater assembly according to claim 11, wherein the resistive element has a high melting point in the range of 1300-1400° C.