CN201069405Y - A skin supporting pipe with dirty removing function - Google Patents

Abstract

The utility model provides a pitot tube with descaling function, which comprises two air inlet pipes and a shell. One end of each of the two air inlet pipes is a detecting end and the other is a tail end. The detecting ends are air inlet ports of the two air inlet pipes, staggered in axial direction and opposite in opening direction. The utility model further comprises a cleaner. The cleaner comprises a driving link rod, a scrape actuating mechanism and a driving mechanism. The driving link rod is arranged between the two air inlet pipes. The scrape actuating mechanism is arranged at one end of the driving link rod and is used to scrape off the smoke scale produced at the air inlet ports. The other end of the driving link rod is connected with the driving mechanism. The driving mechanism provides power and is connected with a controller. The controller serves to send an execution command to the driving mechanism. The shell is arranged outside the two air inlet pipes and the cleaner.

Description

A kind of pitot tube with descaling function

Technical field

The utility model relates to a kind of measurement mechanism of flowing gas pressure, particularly be a kind of can be to dynamic pressure sample tap and static pressure sample tap, the pitot tube that the dirt that accumulates in sampling process is in time removed.

Background technology

The important device of fixed-contamination emission source pressure measurement such as present known flue, chimney, gas outlet is a S type pitot tube.See also shown in Figure 1, its pitot tube synoptic diagram that does not have choke preventing function for using in the prior art, its structure is to be made of side by side two tubes, wherein pipe sample tap over against gas flow direction to be measured, be used to measure the dynamic pressure value; Another root pipe sample tap is used to measure static pressure back to gas flow direction.Owing to contain a large amount of flue dust and tar in the tested gas, in actual measurement, find S type pitot tube in use, flue dust and tar stick on the air intake opening easily.Its exhaust flow velocity is calculated by following formula:

$\mathrm{Vsi}=\mathrm{Kp}\sqrt{\frac{2\mathrm{Pdi}}{\mathrm{Ps}}}$

V ^Si---measurement point discharge speed, m/s;

P ^Di---measurement point exhaust dynamic pressure, Pa;

Kp---pitot tube correction coefficient;

Wet exhaust density in the pipeline under the Ps---measurement state, Kg/m3;

Learn that by following formula pressure is unimpeded relevant with the gas circuit of pitot tube, the air intake opening chocking-up degree influences the measurement of pressure, and flow velocity is relevant with Kp--pitot tube correction coefficient simultaneously, and the pitot tube correction coefficient is relevant with the sample tap sectional area.There are a large amount of flue dust and tar to stick on the sample tap in the actual measurement, directly influenced the sectional area size of air intake opening.

Find in the actual measurement that S type pitot tube sample tap is adhered to by flue dust and tar easily, result in blockage, thereby changed the sectional area size of pitot tube air intake opening, pressure measurement errors is increased, influence the measurement of other parameters such as flow velocity, also design and study for solving some project planners, Chinese patent 200320115566.6 discloses a kind of anti-blocking standard pitot tube, and it belongs to a kind of piezometry instrument of gas.See also shown in Figure 2, the synoptic diagram that has the choke preventing function pitot tube in its prior art, special feature is: pressure 15 a front end axial centre are provided with the bigger air inlet tube chamber 16 of opening that is connected with total head interface channel pipe 12, be provided with an air chamber 13 that is connected with static pressure interface channel pipe 11 at pressure 15 rear portion, place at close pressure 15 openend in the front of air chamber 13 is provided with a ring cutting groove 14 radially that is used for the static pressure air inlet, and ring cutting groove 14 A/Fs and pressure 15 diameter ratio are 1: 20-1: 8.Have 1 to communicate with air chamber to a plurality of apertures in the ring cutting groove 14.Its ways of measure pressure is the same with the primary standard pitot tube, can measure total head, static pressure, dynamic pressure simultaneously, the measuring accuracy height.Reach anti-stifled purpose by the ring cutting groove of setting up 14.But in fact along with the carrying out of service time, the turning point between ring cutting groove 14 places and air intake opening also is easy to generate obstruction, therefore still needs a kind of structural improvement of pitot tube can overcome the defective that crock stops up fully.

In view of the defective of above-mentioned existence, the utility model creator is through research and test have obtained this creation finally for a long time.

Summary of the invention

The purpose of this utility model is, a kind of pitot tube with descaling function is provided, in order to overcome above-mentioned technological deficiency.

For achieving the above object, the technical solution adopted in the utility model is, a kind of pitot tube with descaling function is provided, it comprises: two draft tube and a shell, and described two draft tube one ends are sound end, the other end is the pipe tail end, it is characterized in that, described sound end is the air intake opening of described two draft tube, and it staggers vertically, and direction is relative;

Also comprise a descaler, described descaler comprises: a drive link, one scrapes a dirty topworks and a driving mechanism, described drive link is arranged between described two draft tube, one end of described drive link is provided with the described dirty topworks of scraping, describedly scrape dirty topworks and be used to scrape the crock that produces at described air intake opening, the other end of described drive link is connected with described driving mechanism, described driving mechanism is in order to produce power, it links to each other with a control device, and described control device is in order to send action command to driving mechanism;

Described shell is arranged on outside described two draft tube and the descaler;

Wherein, described two draft tube are in same plane, and are bent to form the S type at described pipe tail end, and the place is provided with described driving mechanism in described S type;

It is wherein, described that to scrape dirty topworks be scraper or steel brush;

Wherein, its knife face of described scraper is that tail flute profile or machine work are fluted;

Wherein, described driving mechanism is motor or cylinder;

Wherein, described control device is single-chip microcomputer, computing machine or embedded system;

Wherein, also comprise a back-blowing device, it links to each other with described control device, receives the control command of described control device, and it links to each other described back-blowing device with described two draft tube respectively, and the crock that scrapes is blown out described two draft tube.

Wherein, described back-blowing device is a blower fan.

The beneficial effects of the utility model are compared with the prior art, on the one hand, between air intake opening, install and scrape dirty topworks, can clean automatically by driving mechanism, pass through the back-blowing device of configuration simultaneously, so that the flue dust that scrapes and coke tar particles and pipe internal contamination thing are blown down in the lump, reach the purpose of cleaning;

Owing to adopt new construction, serviceable life is elongated on the other hand, and accuracy of measurement improves, and can be used for the gas flow rate on-line measurement.

Description of drawings

The pitot tube synoptic diagram that do not have choke preventing function of Fig. 1 for using in the prior art;

Fig. 2 is for having the synoptic diagram of choke preventing function pitot tube in the prior art;

Fig. 3 is the front view that the utlity model has the pitot tube of descaling function;

Fig. 4 is the vertical view that the utlity model has the pitot tube of descaling function.

Embodiment

Below in conjunction with accompanying drawing, be described in more detail with other technical characterictic and advantage the utility model is above-mentioned.

See also Fig. 3, shown in Figure 4, it is the front view that the utlity model has the pitot tube of descaling function, it comprises: two draft tube 23,24 and one shell 26, described two draft tube one ends are sound end 231,241, the other end is pipe tail end 232,242, described two draft tube 23,24 are in same plane, and at described pipe tail end 232,242 are bent to form the S type, described two draft tube sound ends 231, the mouth of pipe of 241 air intake opening is relative, and certain distance staggers, a descaler is set, described descaler comprises: a drive link 21, one scrapes a dirty topworks 25 and a driving mechanism 27, described drive link 21 is arranged at described two draft tube 23, between 24, one end of described drive link 21 is provided with a fastener 22 and scrapes dirty topworks 25 and be connected with described, can scrape dirty topworks 25 and be used to scrape by described at described two draft tube sound ends 231, the crock that 241 air intake opening produces, described scrape dirty topworks 25 for scraper or steel brush one of them, if with described scraper is example, then its knife face is that tail flute profile or machine work are fluted; The other end of described drive link 21 is connected with described driving mechanism 27, described driving mechanism 27 is arranged on described S type indent, described driving mechanism 27 can for motor or cylinder one of them, scrape dirty topworks 25 and drive link 21 reciprocating power in order to generation, it links to each other with a control device 3, and described control device 3 is in order to send action command to driving mechanism 27; Described control device 3 is a single-chip microcomputer, computing machine or embedded system one of them, the present invention is example with the computing machine, the cost of the measurement mechanism of this main and flowing gas pressure itself, the ability of data processing is relevant, described shell 24 is arranged on described two draft tube 23,24 and descaler outside, also comprise a back-blowing device 4, it is to be a blower fan, it links to each other with described control device 3, receive the control command of described control device 3, described back-blowing device its respectively with described two draft tube 23,24 link to each other, and the crock that scrapes is blown out described two draft tube 23,24 (not shown).

During work, probe 231,241 parts of described pitot tube are put into flue, air intake opening at described two draft tube sound ends 231,241 after work a period of time begins fouling, this moment, computer system control driving mechanism 27 and back-blowing device were worked simultaneously, reach like this and regularly clean pitot tube, gas circuit is kept clear, the measurement of pressure is more near actual value, the purpose that the sectional area of air intake opening remains unchanged, keep the stable of pitot tube correction coefficient Kp simultaneously, guaranteed the accuracy of measurement result like this.By facts have proved, the alternative original S type pitot tube of this device is used for flue dust, the flue gas on-line monitoring is more practical.

The descaler to-and-fro movement of the utility model pitot tube also can be ordered about by artificial promotion or machine power, and computer control times of exercise and each checkout time are looked the air intake opening degree of fouling and regularly removed; Below be a concrete example of implementing, provide corresponding basic parameter:

Described pitot tube air intake opening opposite face, two relative air intake opening plane clearance vertical range: 0.01～50mm, two air intake opening centre distance: 2～500mm, pitot tube diameter 2～100mm, pitot tube length: 10mm～10m cylinder can bear 1～5kg pressure, and the distance range of cylinder straight reciprocating motion is 10mm～500mm.

The above only is preferred embodiment of the present utility model, only is illustrative for the utility model, and nonrestrictive.Those skilled in the art is understood, and can carry out many changes to it in the spirit and scope that the utility model claim is limited, revise, even equivalence, but all will fall in the protection domain of the present utility model.

Claims (8)

1. pitot tube with descaling function, it comprises: two draft tube and a shell, described two draft tube one ends are sound end, the other end is characterized in that for the pipe tail end described sound end is the air intake opening of described two draft tube, it staggers vertically, and opening direction is relative;

Also comprise a descaler, described descaler comprises: a drive link, one scrapes a dirty topworks and a driving mechanism, described drive link is arranged between described two draft tube, one end of described drive link is provided with the described dirty topworks of scraping, describedly scrape dirty topworks and be used to scrape the crock that produces at described air intake opening, the other end of described drive link is connected with described driving mechanism, described driving mechanism is in order to produce power, it links to each other with a control device, and described control device is in order to send action command to driving mechanism;

Described shell is arranged on outside described two draft tube and the descaler.

2. the pitot tube with descaling function according to claim 1 is characterized in that, described two draft tube are in same plane, and are bent to form the S type at described pipe tail end, is provided with described driving mechanism in described S type indent.

3. the pitot tube with descaling function according to claim 1 is characterized in that, described to scrape dirty topworks be scraper or steel brush.

4. the pitot tube with descaling function according to claim 3 is characterized in that, its knife face of described scraper is that tail flute profile or machine work are fluted.

5. the pitot tube with descaling function according to claim 1 is characterized in that, described driving mechanism is motor or cylinder.

6. the pitot tube with descaling function according to claim 1 is characterized in that, described control device is single-chip microcomputer, computing machine or embedded system.

7. the pitot tube with descaling function according to claim 1, it is characterized in that, also comprise a back-blowing device, it links to each other with described control device, receive the control command of described control device, it links to each other described back-blowing device with described two draft tube respectively, and the crock that scrapes is blown out described two draft tube.

8. the pitot tube with descaling function according to claim 7 is characterized in that, described back-blowing device is a blower fan.

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