CN111638243A - Cylindrical heating rod test section filled with inert gas and air gap sealing method - Google Patents
Cylindrical heating rod test section filled with inert gas and air gap sealing method Download PDFInfo
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- CN111638243A CN111638243A CN202010446328.1A CN202010446328A CN111638243A CN 111638243 A CN111638243 A CN 111638243A CN 202010446328 A CN202010446328 A CN 202010446328A CN 111638243 A CN111638243 A CN 111638243A
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- test section
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- air gap
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/062—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces characterised by the geometry of the seat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
- F16J15/102—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
- F16J15/104—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by structure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/42—Heating elements having the shape of rods or tubes non-flexible
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/01—Pure fluids
- F17C2221/016—Noble gases (Ar, Kr, Xe)
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
A cylindrical heating rod test section filled with inert gas and an air gap sealing method are disclosed, wherein the test section comprises a test section outer sleeve, an outer surface, a heating block and an inner surface which are coaxially arranged from outside to inside in sequence, the radial dimension and the air gap sealing are carried out through outer sealing rings and inner sealing rings at two ends of the test section outer sleeve, and the axial fixing is carried out through a special flange and a gland. And filling inert gas into the inner and outer air gaps through the gas inlet at one end of the outer sleeve of the test section, filling the air gaps with the inert gas after a period of time, and closing the gas outlet valve to maintain pressure. The test section of the cylindrical heating rod filled with the inert gas can simulate the air gap state of the cylindrical heating rod, the adopted two pairs of cone seals can ensure the air tightness of the inner air gap and the outer air gap of the test section, and the adopted unique air path solves the problems of inert gas filling and air gap pressure maintaining of the test section of the cylindrical heating rod.
Description
Technical Field
The invention belongs to the technical field of industrial heating, and relates to a cylindrical heating rod test section filled with inert gas and an air gap sealing method.
Technical Field
The cylindrical heating rod has higher safety and better economy, and is increasingly applied to the field of industrial heating. The cylindrical heating rod is structurally complicated in the traditional cylindrical heating rod, a certain annular narrow gap is reserved between the inner surface and the outer surface of the cylindrical heating rod and the heating block for adjusting swelling of the heating block, and inert gas is filled in the gap for insulation. Although the existence of the air gap can increase the heat conduction resistance, the cylindrical heating rod still has the advantage of lower temperature compared with the traditional cylindrical heating rod when the heating power is constant due to the unique structure of double-sided heating. In other words, the cylindrical heating rod may have a higher power with a certain limit on the safe temperature of the heating rod. In order to improve the heat transfer performance of the gap and reduce the pressure difference between the inside and the outside of the surface, helium gas with the pressure of 1-4 MPa is generally selected to be filled in the gap. The air gap width of the narrow gap space and the air gap pressure affect the heat exchange performance of the cylindrical heating rod, so that experimental research on the air gap of the cylindrical heating rod is needed. And the air gap with small size and large pressure greatly improves the requirements of filling and sealing the air gap inert gas of the test section of the cylindrical heating rod. The invention provides a cylindrical heating rod test section filled with inert gas and an air gap sealing method based on the requirement, and aims to solve the problems of filling of gap inert gas and air gap sealing of the cylindrical heating rod test section.
Disclosure of Invention
In order to solve the problems of the prior art, an object of the present invention is to provide a test segment of a cylindrical heating rod filled with an inert gas and a method for sealing an air gap, which can simulate the air gap state of the cylindrical heating rod during a test to study the test result of the influence of the air gap state on the heat exchange performance of the heating rod.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a cylindrical heating rod test section filled with inert gas comprises a test section consisting of a test section outer sleeve 7, an outer surface 8, a heating block 9 and an inner surface 10 which are coaxially arranged from outside to inside in sequence, wherein two ends of the test section are radially fixed in size and sealed in an air gap mode through an outer sealing ring 2 and an inner sealing ring 11, and are axially fixed through a flange 3 and a gland 1; the annular air gap between the outer surface 8 and the heating block 9 is an outer air gap 5, and the annular air gap between the inner surface 10 and the heating block 9 is an inner air gap 6.
The inner edges of the outer surface 8 and the two ends of the heating block 9 are provided with a certain chamfer; the outer sealing ring 2 and the inner sealing ring 11 are both ring-shaped gaskets made of polytetrafluoroethylene materials in a special mode, and the inner boundary at one end is provided with a ring-shaped conical bulge which is used for being assembled with chamfers arranged on the outer surface 8 and the inner edges at two ends of the heating block 9 and respectively carrying out conical sealing on the outer air gap 5 and the inner air gap 6; and one side of the outer sealing ring 2 is provided with an outer sealing ring air hole 15.
The outer surface 8 compresses the outer sealing ring 2 through the flange 3 for fixing; the heating block 9 is fixed by pressing the gland 1 to compress the inner sealing ring 11.
The two ends of the test section outer sleeve 7 are respectively provided with an air inlet 14 and an air outlet 16, and the air passage 13 communicated with the air inlet 14 and the air outlet 16 comprises three parts, namely two horizontal air passages arranged in the two ends of the test section outer sleeve 7 and in the flange 3 and a vertical air passage communicated with the two horizontal air passages; the vertical air channel is provided with a gasket seal at the interface of the test section outer sleeve 7 and the flange 3; the horizontal air passage is connected with the outer sealing ring air hole 15; an inner air gap air inlet hole 12 communicated with the outer sealing ring air hole 15 is formed in the heating block 9; an outer air gap air inlet 4 is arranged on the heating block 9 at a preset position away from the inner air gap air inlet and is used for communicating the inner air gap with the outer air gap.
The inert gas filling method is characterized in that the inert gas filling method is used for filling the inert gas in the test section of the cylindrical heating rod filled with the inert gas and sealing the test section, and the gas inlet 14 is connected with a gas cylinder; the air outlet 16 is provided with an air outlet valve 17; the inert gas filling method comprises the steps of firstly opening the gas outlet valve 17, then opening the gas cylinder to start gas filling into the air gap, enabling inert gas to enter the inner air gap 6 from the gas inlet 14 of the outer sleeve of the test section through the gas passage 13, the air hole 15 of the outer sealing ring and the gas hole 12 of the inner air gap in sequence, enabling the inert gas to enter the outer air gap 5 through the gas hole 4 of the outer air gap, filling the air gap with the inert gas after a period of time, and closing the gas outlet valve to maintain pressure.
Compared with the prior art, the invention has the following advantages:
1. the test section can simulate the air gap state of the cylindrical heating rod in the test process.
2. In the test section, the inner and outer air gaps are sealed in a conical manner by adopting the inner and outer pairs of sealing rings so as to ensure the air tightness of the test section, and the difficulty in sealing the air gaps of the test section of the cylindrical heating rod is solved.
3. According to the test section, the inert gas is filled into the cylindrical heating rod test section by using the unique gas path, so that the problem of air gap pressure maintaining of the cylindrical heating rod is solved.
Drawings
FIG. 1 is a schematic overall view of a test section of the present invention.
Detailed Description
The invention is described in detail below with reference to the attached drawing figures:
as shown in figure 1, the cylindrical heating rod test section filled with inert gas comprises a test section outer sleeve 7, an outer surface 8, a heating block 9 and an inner surface 10 which are coaxially arranged from outside to inside in sequence, wherein both ends of the test section are radially fixed in size and sealed in an air gap through an outer sealing ring 2 and an inner sealing ring 11, and are axially fixed through a flange 3 and a gland 1. The annular air gap between the outer surface 8 and the heating block 9 is an outer air gap 5, and the annular air gap between the inner surface 10 and the heating block 9 is an inner air gap 6.
As shown in fig. 1, the inner edges of the outer surface 8 and the two ends of the heating block 9 are provided with a certain chamfer; the outer sealing ring 2 and the inner sealing ring 11 are both ring-shaped gaskets made of polytetrafluoroethylene materials, and the inner boundary of one end of each ring-shaped gasket is provided with a ring-shaped conical bulge which is used for being assembled with chamfers arranged on the inner boundaries of the two ends of the outer surface 8 and the heating block 9 and respectively carrying out cone sealing on the outer air gap 5 and the inner air gap 6. And one side of the outer sealing ring 2 is provided with an outer sealing ring air hole 15.
As shown in fig. 1, the outer surface 8 is fixed by pressing the flange 3 against the outer sealing ring 2. The heating block 9 is fixed by pressing the gland 1 to compress the inner sealing ring 11.
As shown in FIG. 1, the two ends of the test section outer sleeve 7 are respectively provided with an air inlet 14 and an air outlet 16, and the air passage 13 communicated with the air inlet 14 and the air outlet 16 comprises three parts, namely two horizontal air passages arranged on the test section outer sleeve 7 and the flange 3 and a vertical air passage communicated with the two horizontal air passages. The vertical duct provides a gasket seal at the interface of the test section outer sleeve 7 and the flange 3. The horizontal air passage is connected with the outer sealing ring air hole 15. An inner air gap air inlet hole 12 communicated with the outer sealing ring air hole 14 is formed in the heating block 9. An outer air gap air inlet hole 4 is arranged at a position of the heating block 9 away from the inner air gap air inlet hole 12 and used for communicating an inner air gap and an outer air gap.
As shown in figure 1, the inert gas filling method for the cylindrical heating rod test section of the invention comprises the steps of filling the inert gas and sealing, wherein the gas inlet 14 is connected with a gas cylinder, and the gas outlet 16 is provided with a gas outlet valve 17. The gas outlet valve 17 is opened, then the gas cylinder is opened to start gas filling into the air gap, inert gas enters the inner air gap 6 from the gas inlet 14 of the outer sleeve of the test section through the gas passage 13, the air hole 15 of the outer sealing ring and the gas inlet hole 12 of the inner air gap in sequence, then enters the outer air gap 5 through the gas inlet hole 4 of the outer air gap, the air gap is filled with the inert gas after a period of time, and the gas outlet valve is closed to maintain pressure.
The above description is only for the purpose of illustrating the present invention, and the implementation of the present invention will be apparent to those skilled in the art, and the present invention is not limited to the above description. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (5)
1. A fill cylindrical heating rod test section of inert gas which characterized in that: the test section comprises a test section outer sleeve (7), an outer surface (8), a heating block (9) and an inner surface (10) which are coaxially arranged from outside to inside in sequence, wherein both ends of the test section are subjected to radial size fixation and air gap sealing through an outer sealing ring (11) and an inner sealing ring (2), and are axially fixed through a flange (3) and a gland (1); the annular air gap between the outer surface (8) and the heating block (9) is an outer air gap (5), and the annular air gap between the inner surface (10) and the heating block (9) is an inner air gap (6).
2. An inert gas filled cylindrical heater rod test section according to claim 1, wherein: the inner edges of the outer surface (8) and the two ends of the heating block (9) are provided with a certain chamfer angle; the outer sealing ring (2) and the inner sealing ring (11) are both ring-shaped gaskets made of polytetrafluoroethylene materials in a special mode, and an annular conical bulge is arranged at the inner boundary of one end of each ring-shaped gasket and used for being assembled with chamfers arranged on the inner edges of the outer surface (8) and the two ends of the heating block (9) and respectively carrying out conical sealing on the outer air gap (5) and the inner air gap (6); and an outer sealing ring air hole (15) is formed in one side of the outer sealing ring (2).
3. An inert gas filled cylindrical heater rod test section according to claim 2, wherein: the outer surface (8) is fixed by tightly pressing the outer sealing ring (2) through the flange (3); the heating block (9) is fixed by pressing the inner sealing ring (11) through the gland (1).
4. An inert gas filled cylindrical heater rod test section according to claim 2, wherein: the two ends of the test section outer sleeve (7) are respectively provided with an air inlet (14) and an air outlet (16), and an air passage (13) communicated with the air inlet (14) and the air outlet (16) comprises three parts, namely two horizontal air passages arranged in the two ends of the test section outer sleeve (7) and in the flange (3) and a vertical air passage communicated with the two horizontal air passages; a gasket is arranged at the interface of the outer sleeve (7) and the flange (3) of the test section of the vertical air passage for sealing; the horizontal air passage is connected with the outer sealing ring air hole (15); an inner air gap air inlet hole (12) communicated with the outer sealing ring air hole (15) is formed in the heating block (9); an outer air gap air inlet hole (4) is formed in the position, away from the inner air gap air inlet hole (12), on the heating block (9) in a preset position and used for communicating the inner air gap with the outer air gap.
5. The method for filling an inert gas and sealing a test section of an inert gas-filled cylindrical heating rod according to claim 4, wherein: the gas inlet (14) is connected with a gas cylinder; the air outlet (16) is provided with an air outlet valve (17); the method comprises the steps of firstly opening a gas outlet valve (17), then opening a gas cylinder to start to inflate into a gas gap, enabling inert gas to sequentially pass through a gas passage (13), an outer sealing ring gas hole (15) and an inner gas gap gas inlet hole (12) from a gas inlet (14) of an outer sleeve of a test section to enter an inner gas gap (6), enabling the inert gas to enter an outer gas gap (5) through an outer gas gap gas inlet hole (4), filling the gas gap with the inert gas after a period of time, and closing the gas outlet valve to maintain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010446328.1A CN111638243B (en) | 2020-05-25 | 2020-05-25 | Cylindrical heating rod test section filled with inert gas and air gap sealing method |
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|---|---|---|---|
| CN202010446328.1A CN111638243B (en) | 2020-05-25 | 2020-05-25 | Cylindrical heating rod test section filled with inert gas and air gap sealing method |
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| CN111638243A true CN111638243A (en) | 2020-09-08 |
| CN111638243B CN111638243B (en) | 2021-06-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111505428A (en) * | 2020-05-25 | 2020-08-07 | 西安交通大学 | Test section for simulating heating fluid of cylindrical heating rod in pipe |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111505428A (en) * | 2020-05-25 | 2020-08-07 | 西安交通大学 | Test section for simulating heating fluid of cylindrical heating rod in pipe |
| CN111505428B (en) * | 2020-05-25 | 2022-06-07 | 西安交通大学 | Test section for simulating heating fluid of cylindrical heating rod in pipe |
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