CN2465165Y - Blocking-proof static pressure measurer - Google Patents

Abstract

The utility model relates to an anti-clogging static pressure measurer, which comprises a buffer container. The utility model is characterized in that the inner side of the buffer container is provided with a vibration wire which can extend from the buffer container and enter a static pressure hole of a passage wall face. The top end of the buffer container is provided with holes which are respectively communicated with a pressure transmission pipe, a blowing pipe and a forced blowing pipe. The middle of the buffer container is provided with the vibration wire. The stuck and accumulated dust which is adjacent to the static pressure hole can be dropped by the proper vibration of a conduit. The vibration wire can be disassembled by upper screw thread connection. The utility model can conveniently adopt high-pressure cleaning gases, can be blew by the forced blowing pipe or be opened the buffer container and adopt mechanical means to dredge. The utility model can overcome the defect that the dredging of a common static pressure measuring point is difficult.

Description

The blocking-proof static pressure measurement mechanism

The utility model belongs to fields of measurement, is specifically related to a kind of blocking-proof static pressure measurement mechanism that is used to measure dust-contained airflow

At present, when measuring the static pressure of dust-contained airflow, the general employing driven baroport on the pipeline wall, by pressure tube static pressure signal is guided to tensimeter or pressure unit, owing to contain solid particle in the air-flow, solid particle enters baroport and results in blockage easily, accuracy and reliability that influence is measured.

The purpose of this device is to find a kind of measuring accuracy that neither influences, and can guarantee the nonclogging method of baroport again, guarantees the blocking-proof static pressure measurement mechanism that accurately and reliably the dust-contained airflow static pressure is carried out continuous coverage.

This blocking-proof static pressure measurement mechanism, comprise a buffer container, it is characterized in that a vibrating-wire 6 is arranged in buffer container 2, described vibrating-wire 6 stretches out buffer container 2 and enters baroport 1 on the pipeline wall, has on the top of buffer container 2 respectively and pressure tube 3, scavenging duct 8, the hole 14,5,13 of forcing scavenging duct 16 to be communicated with.The hole 5 that described scavenging duct 8 is communicated with is a micro-hole, and baroport 1 is 15～25 with the diameter ratio of micro-hole 5.

Pressure limiting valve 4 is housed on the pressure tube 3.Scavenging duct 8 is connected between high pressure clean air pipe 12 and the micro-hole 5, and stop valve 9 is connected on to be forced between scavenging duct 16 and the high pressure clean air pipe 12.Described vibrating-wire 6 one ends are fixed on the top of buffer container 2 by connector 11, the bell 17 that the other end stretches out the buffer container lower end enters the static mini hole 1 on the pipeline wall, the orienting lug 10 of one definite vibrating-wire 6 directions is arranged on the bell internal face, and described vibrating-wire 6 has a stretch section 15.

The utlity model has following advantage:

1. vibrating-wire is housed in the middle of the buffer container, and the vibration in tube road itself will be glued near the dust that amasss baroport and be hit, and vibrating-wire can be convenient to the mediation of baroport by the dismounting that is threaded on top; Just in case baroport stops up, this device can adopt the high pressure clean air by forcing the scavenging duct purging or opening buffer container and adopt mechanical means mediation easily, has avoided the shortcoming of general hydrostatic measuring point mediation difficulty;

2. an end of scavenging duct is connected with buffer container, have the much smaller pin hole of relative baroport diameter on the wall of buffer container, the other end is connected with high pressure clean air pipe, the static pressure of the high pressure clean air pressure that adopts in the pipeline, a spot of high pressure clean air enters in the buffer container by pin hole, promptly guaranteed dust stratification in the purging buffer container, the static pressure that can not influence again in the buffer container changes, and makes measuring accuracy meet the requirements (principle is partly seen embodiment);

3. be provided with pressure tube behind the buffer container, pressure signal delivered to equipment such as transmitter or tensimeter, be provided with pressure limiting valve in the middle of the pressure tube, thereby further guarantee the accurate and reliable of measured value;

4. this apparatus structure is simple, manufacturing, easy for installation, and the operational reliability height, maintenance workload is little; Have the bigger scope of application, can be applied in the static pressure measurement process of all dust-contained airflows.

Embodiment of the present utility model is referring to figure below.

Fig. 1 is a cut-open view of the present utility model.

On the pipeline wall, have baroport 1, buffer container 2 is housed outside baroport; Be furnished with a vibrating-wire 6 in the buffer container 2, these vibrating-wire 6 one ends are fixed on the top of buffer container 2 by connector 11, the bell 17 that the other end stretches out the buffer container lower end enters the baroport 1 on the pipeline wall, its effect is that the vibration in tube road itself will be glued near the dust that amasss baroport 1 and be hit, just in case owing to high pressure clean air circuit failure is stopped transport and vibrating-wire 6 removals can be handled when causing in the buffer container 2 a large amount of accumulated powder, for the ease of the installation and the location thereof of vibrating-wire 6, orienting lug 10 is housed in buffer container 2 bottoms; Micro-hole 5, through hole 13,14 are arranged at the top of buffer container 2, and pressure tube 3 communicates with through hole 14, in the middle of the pressure tube 3 pressure limiting valve 4 is housed, and prevents when baroport 1 from stopping up that the pressure in the buffer container 2 is excessive and damages pressure unit or the tensimeter that connects later; Force scavenging duct 16 two ends to communicate with high pressure clean air pipe 12 and the through hole 13 that cushions on the container 2 respectively, stop valve 9 is equipped with in the centre, and when normally moving, this valve closing opens it when needs purge to purging in the buffer container 2; One end of scavenging duct 8 is communicated with micro-hole 5 on the buffer container 2, and the other end is connected with high pressure clean air pipe 12, and a spot of high pressure clean air can enter in the buffer container 2 by micro-hole 5; On the high pressure clean air pipe 12 filtrator 7 is housed, with the impurity in the high pressure clean air (oil, water, solid particle etc.) filtering, in order to avoid stop up pin hole 5.

Measuring principle is as follows:

General static pressure measurement device is not provided with scavenging duct 8, because buffer container 2 links to each other with pipe interior by baroport 1, so the pressure in the buffer container 2 equal the static pressure in the pipeline, and the pressure signal that pressure tube 3 is drawn also equals the interior static pressure of pipeline.In this device, pressure enters in the buffer container 2 by micro-hole 5 far above the high pressure clean air of static pressure in the pipeline, but because the diameter of micro-hole 5 is very little, resistance is very big, therefore the high pressure clean air amount that enters buffer container is also little, and these high pressure clean airs enter in the pipeline through relatively large baroport 1.Because flowing of this a small amount of high pressure clean air makes dust be difficult to enter in the baroport, the baroport place is difficult for accumulated powder; When baroport place contingency had accumulated powder, at first the bump of vibrating-wire can hit it fall, and perhaps because accumulated powder causes the baroport diameter to reduce, resistance increases, and the pressure in the buffer container raises, and accumulated powder is extruded baroport.So just guaranteed that baroport can not stop up.

Suppose that the pressure in the buffer container is p ', static pressure in the pipeline is that the pressure of required measurement is p, the high pressure clean air is w through the speed in the baroport flow ipe, the diameter of baroport is D, pipeline wall thickness is L, the coefficient of frictional resistance of baroport is λ, imports and exports local resistance coefficient and is respectively ξ ', ξ ", so: $\left(p^{\′}\right)=p+\frac{1}{2}\mathrm{\ρ}{w}^2(\mathrm{\λ}\frac{L}{D}+{\mathrm{\ξ}}^{\′}+{\mathrm{\ξ}}^{\′\′})=p+\mathrm{\Δp}$ Generally speaking, λ=0.015, ξ '=0.5, ξ "=1, L/D≤1, the density ≈ 1kg/m of air-flow ³, because baroport is with to compare pinhole diameter very big, so that air communication is crossed the speed of baroport is very little, we can control the pressure of high pressure clean air and the diameter of pin hole, make speed w≤0.5m/s, so $\mathrm{\Δ}{p}_{\max }=\frac{1}{2}\×1\×{0.5}^2\×(0.015+0.5+1.0)=0.19\mathrm{Pa}$

Therefore, because a small amount of high pressure clean air sprays into the not enough 0.2Pa of the pressure differential that causes, so little error can be ignored in engineering is used, and can think that the pressure that measures by pressure tube equals the static pressure in the pipeline.

Claims (6)

1. blocking-proof static pressure measurement mechanism, comprise a buffer container (2), it is characterized in that a vibrating-wire (6) is arranged in buffer container (2), described vibrating-wire (6) stretches out buffer container (2) and enters baroport (1) on the pipeline wall, has on the top of buffer container (2) and pressure tube (3), scavenging duct (8), the hole (14,5,13) of forcing scavenging duct (16) to be communicated with.

2. blocking-proof static pressure measurement mechanism according to claim 1, it is characterized in that described vibrating-wire (6) one ends are fixed on the top of buffer container (2) by connector (11), the bell (17) that the other end stretches out the buffer container lower end enters the baroport (1) on the pipeline wall, and an orienting lug (10) of determining vibrating-wire (6) direction is arranged on bell (17) internal face.

3. blocking-proof static pressure measurement mechanism according to claim 1 and 2 is characterized in that the described hole (5) that is communicated with scavenging duct (8) is micro-hole, and baroport (1) is 15～25 with the diameter ratio of micro-hole (5).

4. blocking-proof static pressure measurement mechanism according to claim 1 and 2 is characterized in that described vibrating-wire (6) has a stretch section (15).

5. blocking-proof static pressure measurement mechanism according to claim 1 and 2 is characterized in that being equipped with on the pressure tube (3) pressure limiting valve (4).

6. blocking-proof static pressure measurement mechanism according to claim 2 is characterized in that scavenging duct (8) is connected between high pressure clean air pipe (12) and the micro-hole (5), and stop valve (9) is connected on to be forced between scavenging duct (16) and the high pressure clean air pipe (12).

Images