CN103808421A - Sheathed thermocouple assembly for cylinder cover temperature measurement, and fabricating and mounting method thereof - Google Patents
Sheathed thermocouple assembly for cylinder cover temperature measurement, and fabricating and mounting method thereof Download PDFInfo
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- CN103808421A CN103808421A CN201410028721.3A CN201410028721A CN103808421A CN 103808421 A CN103808421 A CN 103808421A CN 201410028721 A CN201410028721 A CN 201410028721A CN 103808421 A CN103808421 A CN 103808421A
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- armoured thermocouple
- copper bush
- nut
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Abstract
The invention provides a sheathed thermocouple assembly for cylinder cover temperature measurement, and fabricating and mounting method thereof. The sheathed thermocouple assembly comprises a sheathed thermocouple (1), wherein the thermode end of the sheathed thermocouple (1) is mounted in a temperature measurement hole (9) formed in the cylinder cover of an engine, a copper bush (2), which is through column, is assembled at the thermode end of the sheathed thermocouple (1), the inner diameter of the copper bush (2) is in clearance fit with the thermode end of the sheathed thermocouple (1), and the outer diameter of the copper bush (2) is in clearance fit with the diameter of the temperature measurement hole (9) formed in the cylinder cover of the engine. The fabricating and mounting method comprises the steps of assembling the copper bush (2) at the thermode end of the sheathed thermocouple (1) by virtue of a grooved hold-down nut (4) and a fastening nut (5), and finally, inserting the sheathed thermocouple assembly into the temperature measurement hole (9) formed in the cylinder cover of the engine from the thermode end. The consistence of measurement point positions of the sheathed thermocouple (1) is ensured, and the cost of the sheathed thermocouple assembly is low.
Description
Technical field
The present invention relates to a kind of engine cylinder cover thermometric armoured thermocouple, more particularly relate to a kind of cylinder cap thermometric armoured thermocouple assembly and making and installation method, belong to Engine Block Test technical field.
Background technology
When engine operation, fuel burns in cylinder, produces a large amount of heat energy, and wherein a part of heat energy is absorbed by cylinder cap, and cylinder cap temperature raises, and at this moment needs recirculated water to be undertaken cooling by cylinder cover water jacket; Due to engine cylinder cover structure complexity, and the ridge area cooling condition of cylinder cap upper air valve periphery is the harshest, and cylinder cap cracking easily occurs; Causing the reason of cylinder cap cracking is that maximum operating temperature condition is inadequate on the one hand, is because temperature cycle changes the fatigue producing on the other hand, and these thermal loads that are referred to as cylinder cap lost efficacy; Therefore conventionally need to measure cylinder cap ridge area temperature, to realize the thermal load evaluation to cylinder cap.
At present the temp measuring method in cylinder cap temperature field is mainly to cover parallel base plate direction punching at engine cylinder, utilizes armoured thermocouple to carry out cylinder cap thermometric, and specifically referring to Fig. 1, armoured thermocouple 1 thermoelectricity is extremely arranged in the thermometer hole 9 of engine cylinder cover to realize thermometric.But, this kind of temp measuring method has following defect: one, be subject to the restriction of conventional machining level due to thermometer hole 9, make thermometer hole 9 diameters can not be less than 2mm, the armoured thermocouple 1 that diameter is 2mm if adopt coordinates while installation, because thermopair is to be made by the thermocouple wire of two kinds of metal materials, two kinds of metal solder ends are that thermoelectricity is extreme, in the time that the installation of TC is in armouring, the extreme armouring that this puts relative 2mm diameter of thermoelectricity accurately temperature-sensitive point is indefinite, so there is the extreme indefinite problem in actual temperature zone of thermoelectricity in armoured thermocouple 1 itself.For example, if when the thinner armoured thermocouple 1 of two employings is installed, its diameter is 1mm, exists and works poor between armoured thermocouple 1 and thermometer hole 9, produces the inconsistent problem in the armoured thermocouple extreme temperature-sensitive of 1 thermoelectricity position.The defect of above two aspects brings the deviation of the above point position of 1mm all can to cylinder cap thermometric, according to engine cylinder cover maximum temperature gradient, can make cylinder cap temperature-measuring results maximum have the consistance deviation of 20 ℃; Therefore, need a kind of simple and practical engine cylinder cover thermometric scheme.
Summary of the invention
The object of the invention is to for existing cylinder cap temp measuring method make processing thermometer hole large, make conventional armoured thermocouple occur the inconsistent problem of measuring point, a kind of cylinder cap thermometric armoured thermocouple assembly and making and installation method are provided.
For achieving the above object, technical solution of the present invention is: a kind of cylinder cap thermometric armoured thermocouple assembly, comprise armoured thermocouple, described armoured thermocouple thermoelectricity is extremely arranged in the thermometer hole of engine cylinder cover, described armoured thermocouple thermoelectricity is extremely fitted with copper bush, described copper bush is logical stem body, and the internal diameter of copper bush coordinates with armoured thermocouple thermode splaying, and the external diameter of copper bush coordinates with the thermometer hole diametric clearance of engine cylinder cover.
Chamfering is arranged at described copper bush edge.
Described chamfer angle is 56 °.
Described copper bush length is 3mm.
A kind of cylinder cap thermometric is made and installation method of armoured thermocouple assembly, and the thermoelectricity that utilizes open flume type gland nut and clamp nut that copper bush is assemblied in to armoured thermocouple is extreme, specifically comprises the following steps:
Step 1, select open flume type gland nut and clamp nut according to the length of copper bush and chamfer angle, the length of copper bush is matched with the effective installation dimension between open flume type gland nut and clamp nut, chamfer angle matches with the cone angle face between open flume type gland nut and clamp nut, and the through hole of clamp nut inside and the notch of open flume type gland nut are matched with armoured thermocouple diameter respectively;
Step 5, will between clamp nut and open flume type gland nut, pass through threaded engagement, copper bush is clipped between the two, further tightening clamp nut makes it coordinate with open flume type gland nut again, utilize the chamfering of copper bush to match with the cone angle face between open flume type gland nut and clamp nut, copper bush is pressed on to armoured thermocouple thermoelectricity extreme;
Step 7, finally this armoured thermocouple assembly is extremely inserted in the thermometer hole of engine cylinder cover to this armoured thermocouple assembly installation from thermoelectricity.
Compared with prior art, the invention has the beneficial effects as follows:
1, modern design, simple in structure, guarantee armoured thermocouple point position consistance, and with low cost.In the present invention, armoured thermocouple thermoelectricity is extremely fitted with copper bush, the internal diameter of copper bush is coordinated with armoured thermocouple thermode splaying, the external diameter of copper bush coordinates with the thermometer hole diametric clearance of engine cylinder cover, when work, avoid armoured thermocouple to occur the inconsistent problem of measuring point, improved the measurement effect of cylinder cap temp measuring method; And existing market armoured thermocouple product is not proposed to too high requirement, guaranteed that the cylinder cap exemplar of processing can use in the past, make cost of manufacture cheap, saved production cost.
2, a kind of cylinder cap thermometric in the present invention is made and installation method of armoured thermocouple assembly, the thermoelectricity that utilizes open flume type gland nut 4 and clamp nut 5 that copper bush 2 is assemblied in to armoured thermocouple 1 is extreme, guarantee under very low manufacturing condition repeatability to install, guaranteed that thus this cylinder cap thermometric armoured thermocouple assembly can implement.
Accompanying drawing explanation
Fig. 1 is existing engine cylinder cover thermometric mode schematic diagram.
Fig. 2 is structural representation of the present invention.
Fig. 3 is copper bush structural representation in the present invention.
Fig. 4 is step 2 fabrication and installation schematic diagram in the present invention.
Fig. 5 is step 3 fabrication and installation schematic diagram in the present invention.
Fig. 6 is step 4 fabrication and installation schematic diagram in the present invention.
Fig. 7 is step 5 fabrication and installation schematic diagram in the present invention.
Fig. 8 is step 6 fabrication and installation schematic diagram in the present invention.
In figure: armoured thermocouple 1, copper bush 2, chamfering 3, open flume type gland nut 4, clamp nut 5, cone angle face 6, pigtail splice end 7, extension lead 8, thermometer hole 9.
Embodiment
Below in conjunction with accompanying drawing explanation and embodiment, the present invention is described in further detail.
Referring to Fig. 2-Fig. 4, a kind of cylinder cap thermometric armoured thermocouple assembly, comprises armoured thermocouple 1, and described armoured thermocouple 1 is normally encapsulated in thermopair in the metallic sheath that entire body diameter is constant and is made, and metallic sheath typically has a diameter from Φ 0.5-Φ 3mm; Thermopair is by the conductive material of two kinds of unlike materials, the temperature probe that utilizes thermoelectric effect principle, be made.Armoured thermocouple 1 comprises thermoelectricity extremely and pigtail splice end 7, and described thermoelectricity is extremely sensor head, is used for measuring temperature; Pigtail splice end 7 is sensor afterbody.Metallic sheath length is pressed measurement demand can be customized, and as 10-500mm, thermopair length is pressed metallic sheath length and made, pigtail splice end welding extension lead 8; Pigtail splice end 7 is considered wiring and reliably protecting, conventionally the diameter at this place is made larger.
Referring to Fig. 2-Fig. 4, described armoured thermocouple 1 thermoelectricity is extremely arranged in the thermometer hole 9 of engine cylinder cover, and armoured thermocouple 1 thermoelectricity is extremely fitted with copper bush 2.Described copper bush 2 is logical stem body, and the internal diameter of copper bush 2 coordinates with armoured thermocouple 1 thermode splaying, the general large 0.1mm of specific heat electrode tip diameter; The external diameter of copper bush 2 coordinates with the thermometer hole of engine cylinder cover 9 diametric clearance, and gap value is not more than Φ 0.1mm, and the cooperation that assurance copper bush 2 external diameters meet cylinder cap thermometer hole 9 diameters requires.Chamfering 3 is arranged to so that its fabrication and installation in described copper bush 2 edges; In this embodiment, chamfering 3 angles are 56 °.Copper bush 2 length described in this embodiment are 3mm.
A kind of cylinder cap thermometric of the present invention armoured thermocouple assembly, on common armoured thermocouple 1, install copper bush 2 additional, guaranteed that armoured thermocouple assembly matches with cylinder cap measuring point hole, solved large, the common armoured thermocouple extreme temperature-sensitive of 1 focus position, cylinder cap measuring point hole inconsistent, give cylinder cap thermometric bring the problems such as deviation.Because cylinder cap thermometer hole 9 diameters are difficult for processing too small, generally be processed as φ 2mm, now analyze with φ 2mm thermometer hole 9, φ 1mm armoured thermocouple 1, copper bush 2 and thermometer hole 9 tolerance clearance 0.1mm, armoured thermocouple 1 thermode end position deviation 0.15mm, calculate by 20 ℃/mm of maximum cylinder cap thermograde, thermometric consistance deviation is less than 5 ℃, has greatly improved cylinder cap thermometric degree of accuracy.
Referring to Fig. 4-Fig. 8, a kind of cylinder cap thermometric is made and installation method of armoured thermocouple assembly, and the thermoelectricity that utilizes open flume type gland nut 4 and clamp nut 5 that copper bush 2 is assemblied in to armoured thermocouple 1 is extreme, specifically comprises the following steps:
Step 1, according to the length of copper bush 2 and chamfering 3 angle Selection open flume type gland nut 4 and clamp nuts 5, the length of copper bush 2 is matched with the effective installation dimension between open flume type gland nut 4 and clamp nut 5, effective installation dimension between open flume type gland nut 4 and clamp nut 5 refers to the effective range of matching thread between open flume type gland nut 4 and clamp nut 5, and in this embodiment, copper bush 2 length are 3mm; Chamfering 3 angles match with the cone angle face 6 between open flume type gland nut 4 and clamp nut 5, generally chamfering 3 angles are less 2 ° than cone angle face 6 angles, cone angle face 6 angles herein refer to the conical surface angle that open flume type gland nut 4 and clamp nut 5 coordinate copper bush 2 fillet surfaces, and in this embodiment, cone angle face 6 angles are that 60 °, chamfering 3 angles are 56 °.And, need to make the through hole of clamp nut 5 inside and the notch of open flume type gland nut 4 coordinate with armoured thermocouple 1 diametric clearance respectively.
Step 5, specifically referring to Fig. 7, to between clamp nut 5 and open flume type gland nut 4, pass through threaded engagement, copper bush 2 is clipped between the two, further tightening clamp nut 5 makes it coordinate with open flume type gland nut 4 again, utilize the chamfering 3 of copper bush 2 to match with the cone angle face 6 between open flume type gland nut 4 and clamp nut 5, copper bush 2 is pressed on to armoured thermocouple 1 thermoelectricity extreme.
Step 7, finally this armoured thermocouple assembly is extremely inserted in the thermometer hole 9 of engine cylinder cover to this armoured thermocouple assembly installation from thermoelectricity.
A kind of cylinder cap thermometric in the present invention is made and installation method of armoured thermocouple assembly, the thermoelectricity that utilizes open flume type gland nut 4 and clamp nut 5 that copper bush 2 is assemblied in to armoured thermocouple 1 is extreme, make under very low production technology cost condition, can guarantee that armoured thermocouple 1 can repeatability install, improve the armoured thermocouple extreme measuring point of 1 thermoelectricity installation site consistance.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, said structure all should be considered as belonging to protection scope of the present invention.
Claims (5)
1. a cylinder cap thermometric armoured thermocouple assembly, comprise armoured thermocouple (1), described armoured thermocouple (1) thermoelectricity is extremely arranged in the thermometer hole (9) of engine cylinder cover, it is characterized in that: described armoured thermocouple (1) thermoelectricity is extremely fitted with copper bush (2), described copper bush (2) is logical stem body, the internal diameter of copper bush (2) coordinates with armoured thermocouple (1) thermode splaying, and the external diameter of copper bush (2) coordinates with thermometer hole (9) diametric clearance of engine cylinder cover.
2. a kind of cylinder cap thermometric armoured thermocouple assembly according to claim 1, is characterized in that: chamfering (3) is arranged at described copper bush (2) edge.
3. a kind of cylinder cap thermometric armoured thermocouple assembly according to claim 2, is characterized in that: described chamfering (3) angle is 56 °.
4. a kind of cylinder cap thermometric armoured thermocouple assembly according to claim 1 and 2, is characterized in that: described copper bush (2) length is 3mm.
5. a kind of cylinder cap thermometric according to claim 2 is made and installation method of armoured thermocouple assembly, it is characterized in that, the thermoelectricity that utilizes open flume type gland nut (4) and clamp nut (5) that copper bush (2) is assemblied in to armoured thermocouple (1) is extreme, specifically comprises the following steps:
Step 1, according to the length of copper bush (2) and chamfering (3) angle Selection open flume type gland nut (4) and clamp nut (5), the length of copper bush (2) is matched with the effective installation dimension between open flume type gland nut (4) and clamp nut (5), chamfering (3) angle matches with the cone angle face (6) between open flume type gland nut (4) and clamp nut (5), and the inner through hole of clamp nut (5) and the notch of open flume type gland nut (4) are matched with armoured thermocouple (1) diameter respectively;
Step 2, that copper bush (2) is enclosed within to armoured thermocouple (1) is upper, and makes copper bush (2) be arranged on the position apart from the extremely about 3mm of armoured thermocouple (1) thermoelectricity;
Step 3, between copper bush (2) and the pigtail splice end (7) of armoured thermocouple (1) along the notch of open flume type gland nut (4), put open flume type gland nut (4);
Step 4, armoured thermocouple (1) is penetrated in clamp nut (5) interior bone, copper bush (2) is positioned between clamp nut (5) and open flume type gland nut (4);
Step 5, will between clamp nut (5) and open flume type gland nut (4), pass through threaded engagement, copper bush (2) is clipped between the two, further tightening clamp nut (5) makes it coordinate with open flume type gland nut (4) again, utilize the chamfering (3) of copper bush (2) to match with the cone angle face (6) between open flume type gland nut (4) and clamp nut (5), copper bush (2) is pressed on to armoured thermocouple (1) thermoelectricity extreme;
Step 6, unclamp coordinating between clamp nut (5) and open flume type gland nut (4), extremely exit clamp nut (5) from armoured thermocouple (1) thermoelectricity, open flume type gland nut (4) takes off from armoured thermocouple (1) by the notch on it, copper bush (2) installs, and this armoured thermocouple assembly completes;
Step 7, finally this armoured thermocouple assembly is extremely inserted in the thermometer hole (9) of engine cylinder cover to this armoured thermocouple assembly installation from thermoelectricity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410028721.3A CN103808421B (en) | 2014-01-22 | 2014-01-22 | A kind of cylinder cap thermometric armoured thermocouple assembly and making and installation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410028721.3A CN103808421B (en) | 2014-01-22 | 2014-01-22 | A kind of cylinder cap thermometric armoured thermocouple assembly and making and installation method |
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| CN103808421A true CN103808421A (en) | 2014-05-21 |
| CN103808421B CN103808421B (en) | 2016-05-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107110055A (en) * | 2014-12-24 | 2017-08-29 | 株式会社京浜 | Combustion engine control |
| CN113566993A (en) * | 2020-04-28 | 2021-10-29 | 中国航发商用航空发动机有限责任公司 | Engine temperature measuring device and heat insulation lining thereof |
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| CN202511885U (en) * | 2011-12-29 | 2012-10-31 | 中航(苏州)雷达与电子技术有限公司 | Butt joint structure of thermocouple type temperature sensor bush and nozzle |
| CN203758627U (en) * | 2014-01-22 | 2014-08-06 | 东风商用车有限公司 | Armored thermocouple assembly for cylinder cover temperature measurement |
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- 2014-01-22 CN CN201410028721.3A patent/CN103808421B/en active Active
Patent Citations (9)
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| WO2001027579A1 (en) * | 1999-10-13 | 2001-04-19 | Texaco Development Corporation | Sapphire reinforced thermocouple protection tube |
| CN2485639Y (en) * | 2000-07-28 | 2002-04-10 | 武汉理工大学 | Temperature sensor for engine cylinder inner wall |
| WO2003081192A1 (en) * | 2002-03-18 | 2003-10-02 | Texaco Development Corporation | Protective cap for a thermocouple in a gasifier |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107110055A (en) * | 2014-12-24 | 2017-08-29 | 株式会社京浜 | Combustion engine control |
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| CN113566993A (en) * | 2020-04-28 | 2021-10-29 | 中国航发商用航空发动机有限责任公司 | Engine temperature measuring device and heat insulation lining thereof |
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| CN103808421B (en) | 2016-05-11 |
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