CN2376573Y

CN2376573Y - Double-pipe type boiler flame detection light-guiding tube

Info

Publication number: CN2376573Y
Application number: CN 99234772
Authority: CN
Inventors: 张永恒
Original assignee: HUANENG ELECTRIC POWER OBSERVE AND CONTROL ENGINEERING Co Ltd XI'AN
Current assignee: HUANENG ELECTRIC POWER OBSERVE AND CONTROL ENGINEERING Co Ltd XI'AN
Priority date: 1999-07-08
Filing date: 1999-07-08
Publication date: 2000-05-03
Anticipated expiration: 2009-07-08

Abstract

The utility model relates to a flame detection light-guiding tube which is used in a boiler flame detector. The flame detection light-guiding tube comprises, an outer sleeve tube, an inner sleeve tube, a plane mirror, a light collecting lens and an optical fiber which are arranged in the inner sleeve tube, a detector head connecter which is fixedly connected with the tail ends of the inner sleeve tube and the outer sleeve tube. Both of the inner sleeve tube and the outer sleeve tube are provided with cooling air channels inside for cooling the optical fiber. The inner cooling air channel of the cooling air channels can blow and sweep the mirror face of the plane mirror. A double-layer mirror face shield which is arranged on the front end of the optical fiber forms heat insulating protection to the front end of the optical fiber. The inner sleeve tube and the outer sleeve tube are coaxially fixed, which prevents against the drift of a visual angle. The flame detection light-guiding tube has the advantages of long service life, signal acquisition accuracy, working reliability, etc.

Description

A kind of double hose boiler flame is surveyed light pipe

The utility model is a kind of flame detecting light pipe that is used in the boiler flame detector.Its major function is that flame light in the boiler furnace is transmitted on the probe.

In prior art, a light pipe all will be set as the probe of boiler flame detector is last, with the flame of this light pipe near boiler-burner, like this, the light that flame sends just can be delivered to probe by light pipe.This light pipe also can avoid the directly nearly flame of probe overheated and damage except transmitting flame light.At present, the flame detecting light pipe of domestic most of public use is a kind of single hose light pipe, it by outer tube, be located at the optical fiber in the outer tube and connect firmly and form at the flame probe connector of outer tube tail end; Wherein the outer tube front end is open shape, and the outer tube tail end is provided with fastening structure, and this fastening structure is fixed on optical fiber in the sleeve pipe, and the flame probe connector is bound up on the tail end of outer tube.The outer tube afterbody is provided with air intake vent, and cooling air blasts outer tube from this air intake vent, axially flows forward along outer tube, and the opening port from the outer tube front end flows out then, thereby the optical fiber in the sleeve pipe is cooled off.Mainly there are following two shortcomings in this single hose photoconductive tube: the one, and the single hose structure, and front end is open, makes the heat resistance of light pipe relatively poor, is often burnt black cisco unity malfunction because of burner hearth high temperature causes the optical fiber front end, and service life is shorter; The 2nd, the optical fiber front end does not have the concentric locating structure, is often vibrated because of light pipe or the factor such as expand with heat and contract with cold of optical fiber the visual angle takes place is offset, and the collection accuracy of flare up fire is reduced.

The purpose of this utility model is at the shortcoming in the prior art, provides a kind of long service life, the flame light signal collection is accurate and functional reliability is strong double hose boiler flame to survey light pipe.

For achieving the above object, solution of the present utility model is as follows: it comprises outer tube, be located at optical fiber in the outer tube, connect firmly the probe connector at the outer tube tail end; Its key structure is: be provided with an inner sleeve in outer tube, this inner sleeve is installed in the outer tube by radially casing support is coaxial, be provided with flat mirror and collector lens successively at described inner sleeve front end, this flat mirror and collector lens are fixedly mounted on the inner sleeve by flat mirror holder and lens mount respectively, be provided with described optical fiber after the collector lens in inner sleeve, the front end of this optical fiber is fixed on the lens mount, and its tail end is fixed on the probe connector; Afterbody at described outer tube is provided with air intake vent, is provided with the wind hole on the radially casing support of inner sleeve, is provided with the printing opacity exhaust vent of undergauge at the outer tube front end; Afterbody at described inner sleeve also is provided with air intake vent, is equipped with the wind hole on the lens mount peace mirror holder in inner sleeve, and this inner sleeve front end cooperates the printing opacity exhaust vent that is provided with undergauge with flat mirror holder.

By above-mentioned solution as can be seen, the utility model has adopted a twin-tube type structure, cooling air can flow in inside and outside sleeve pipe simultaneously, simultaneously, front end at inside and outside sleeve pipe is provided with the double layer screen formula printing opacity exhaust vent that dwindles, thereby the light pipe heat resistance is strengthened greatly, avoided the optical fiber front end to be burnt the generation of deceiving phenomenon, prolonged the service life of light pipe.Moreover inner sleeve of the present utility model is coaxial fixing by casing support radially, and its visual angle contraposition accurately stablize, has prevented the visual angle skew, compared with the prior art, and the big raising of accuracy of flare up fire collection.In addition, the utility model also has minute surface purging function and probe heat-proof quality preferably, has reduced the generation of minute surface " blind " phenomenon, has guaranteed the probe operate as normal, thereby has improved the reliability of light pipe work.

Describe structure of the present utility model and operation principle in detail according to embodiment below.

Fig. 1, overall structure figure of the present utility model.

Referring to Fig. 1, sequence number 5 is described outer tubes, in outer tube, be provided with inner sleeve 4, this inner sleeve is installed in the outer tube 5 by extended radially casing support 4a, 4b are coaxial from its tube wall, front end at inner sleeve 4 is provided with flat mirror 10 and collector lens 8 successively, they are fixedly mounted on the front portion of inner sleeve 4 respectively by flat mirror holder 11 and lens mount 7, be provided with optical fiber 6 in the back of collector lens 8, the front end of this optical fiber is fixed on the lens mount 7, and its tail end is fixed on the probe connector 1 by clamp nut 2.When this light pipe was aimed at flame, flame light was injected from printing opacity exhaust vent 5b, passed flat mirror 10 and collector lens 8 arrival optical fiber, and arrived probe by fiber optic conduction.Afterbody at described outer tube is provided with air intake vent 5a, and at work, cooling air will blast light pipe by this air intake vent always.On described radially casing support 4a, be provided with wind hole 4c, be provided with the printing opacity exhaust vent 5b of undergauge at the outer tube front end; After cooling air blasted from air intake vent 5a, the air channel that it just forms between inside and outside sleeve pipe is operation forward axially, passed to cross wind hole 4c on the casing support, flowed out from the printing opacity exhaust vent 5b of outer tube front end, thereby formed an outer cooling air channel; Afterbody at described inner sleeve is provided with a plurality of air intake vent 4d, and on lens mount 7, be provided with wind hole 7a, on flat mirror holder 11, also be provided with wind hole 11a, this is crossed the wind hole and is located at before the flat mirror, and radially or horizontally set, like this, when cooling air passes through, can form purging, often be in clean state, prevent that the phenomenon of " blind " from appearring in light pipe to guarantee flat mirror minute surface to flat mirror minute surface; The front end of described inner sleeve 4 is open shape, flat mirror holder 11 is by the front end that is installed in inner sleeve that cooperates of the undergauge step on the hole enlargement step on its front end outer wall and the inner sleeve front inner wall, the rear end of flat mirror holder 11 is provided with flat mirror mounting groove, flat mirror 10 is fixed in this groove by snap ring 9, flat mirror holder front end is provided with the printing opacity exhaust vent of undergauge axis hole 11b as inner sleeve, and the described wind hole 11a that crosses communicates with printing opacity exhaust vent 11b.After cooling air is blasted light pipe, some also enters the inner sleeve from the air intake vent 4d of inner sleeve, and along axially operation forward of inner sleeve, successively pass the wind hole excessively on the lens mount peace mirror holder, the printing opacity exhaust vent before inner sleeve flows out, and this cooling air was when passing through wind hole 11a, formation is to the purging of flat mirror 11, simultaneously, this cooling air also can cool off optical fiber by inner sleeve the time once more.At the tail end spiral marking connection of outer tube a tail-hood 3, the fastening connection by this tail-hood can with inside and outside sleeve pipe axially and radially all be fixed, simultaneously, also will pop one's head in connector 1 and this photoconductive tube are bound up.The probe connector 1 of this example adopts the bakelite material, like this, can reduce the heat conduction of light pipe to probe, the steady operation that helps popping one's head in.If this light pipe is used for swing burner, then one section flexible tube section 5c, 4e can be set at the middle part of inside and outside sleeve pipe respectively, like this, this light pipe just can make its visual angle aim at the flame region that is monitored all the time in use along with burner is swung together.Can further find out by the foregoing description; this light pipe is held the double thermal insulation protection of mirror and lens before by double-tube structure and inner sleeve level with both hands; its cooling and heat-proof quality have been improved greatly; prolonged the service life of optical fiber; simultaneously; it has improved the leaded light accuracy and the functional reliability of this light pipe also by the appropriate design on the connecting structure, and field experiment has also confirmed this point.

Claims

1, a kind of double hose boiler flame is surveyed light pipe, and it comprises outer tube (5), be located at optical fiber (6) in the outer tube, connect firmly the probe connector (1) at the outer tube tail end; It is characterized in that:

A, in outer tube, be provided with an inner sleeve (4), this inner sleeve by casing support (4a) radially, (4b) is coaxial is installed in the outer tube, be provided with flat mirror (10) and collector lens (8) successively at described inner sleeve front end, this flat mirror and collector lens are fixedly mounted on the inner sleeve by flat mirror holder (11) and lens mount (7) respectively, be provided with described optical fiber (6) after the collector lens in inner sleeve, the front end of this optical fiber is fixed on the lens mount (7), and its tail end is fixed on the probe connector (1):

B, be provided with air intake vent (5a), on the radially casing support of inner sleeve, be provided with wind hole (4c), be provided with the printing opacity exhaust vent (5b) of undergauge at the outer tube front end at the afterbody of described outer tube;

C, also be provided with air intake vent (4d) at the afterbody of described inner sleeve, be equipped with wind hole (7a), (11a) on the lens mount peace mirror holder in inner sleeve, this inner sleeve front end cooperates the printing opacity exhaust vent (11b) that is provided with undergauge with flat mirror holder.

2, boiler flame as claimed in claim 1 is surveyed light pipe, it is characterized in that: the wind hole (11a) of crossing on the described flat mirror holder is located at flat mirror (11) before, and radially or horizontally set.

3, boiler flame as claimed in claim 1 or 2 is surveyed light pipe, it is characterized in that: be provided with one section flexible tube section (5c), (4e) at described outer tube and inner sleeve middle part.

4, boiler flame as claimed in claim 1 or 2 is surveyed light pipe, and it is characterized in that: described probe connector (1) is heat insulation bakelite material.

5, boiler flame as claimed in claim 3 is surveyed light pipe, and it is characterized in that: described probe connector (1) is heat insulation bakelite material.