CN2653514Y

CN2653514Y - Pipe line wind speed bypass monitor

Info

Publication number: CN2653514Y
Application number: CN 200320117251
Authority: CN
Inventors: 高敏坚
Original assignee: Yudong Zhongshan Machinery Engineering Co ltd
Current assignee: Yudong Zhongshan Machinery Engineering Co ltd
Priority date: 2003-10-16
Filing date: 2003-10-16
Publication date: 2004-11-03
Anticipated expiration: 2013-10-16

Abstract

The utility model relates to a pipeline wind speed bypass monitor device and comprises a pressure difference signal transducer device 1, a bypass pipeline 2, an external pipe 3, an inner pipe 4 and a branch pipe 5. One end of the bypass pipeline 2 is provided with an air gap 6 and the other end is communicated with the main pipeline 7. The inner pipe is installed inside the bypass pipeline 2 and the opening at the top of the inner pipe 4 is opposite with the air gap 6. The tail part of the inner pipe 4 extends out from the side of the bypass pipeline 2. The external pipe 3 is installed inside the bypass pipeline 3 and sleeves outside the inner pipe 4. The top end of and the tail end of the external pipe 3 are sealed to form a sealed space 9 between the external pipe 3 and the inner pipe 4. The side of the external pipe 3 is provided with air inlet 8. The branch pipe 5 enters from outside the bypass pipeline 2 and is connected with the side of the external pipe 3. The tail end of the branch pipe 5 and that of the internal pipe are connected to the input end of the pressure difference signal transducer device 1. The utility model indirectly presents the flow rate signals of the main pipeline from the pressure difference signal of the bypass system, improves the precision of monitor, ensures the stability of the flow rate of the main pipeline, reduces the pressure of the monitor device and prolongs the service life of the monitor device.

Description

Air velocity duct bypass monitoring device

1, technical field:

The utility model relates to air velocity duct bypass monitoring device, and it utilizes bypass air monitoring trunk line wind speed.

2, background technology:

The device that is used for directly monitoring the flow velocity of pipeline two-phase flow at present has a variety of, so-called pipeline two-phase flow is meant the air-flow that contains powder and does not contain two kinds in the anti-phase air-flow of powder, but because the effect of two-phase eddy currents in airflow, make certain a bit at a time, change in flow on a certain direction is quite big, so be the wind speed situation that can not reflect whole pipe, if will reflect that the wind speed of whole pipe must be provided with a plurality of probes, a plurality of instruments, get its mean value, so, not only uneconomical, and also probe quantity too much can influence the flow area of pipeline again, thereby influence the flow velocity of pipeline, for the air-flow that contains powder, powder can influence the precision and the life-span of monitoring instrument itself, and its monitoring is difficulty more.

3, summary of the invention:

The purpose of this utility model provides air velocity duct bypass monitoring device, it is by being provided with bypath system and differential pressure signal induction installation, detect pressure difference signal reflection flow velocity signal in bypath system, thereby reflect the trunk line wind speed indirectly with the bypass wind speed, chimneying is implemented monitoring in real time, its monitoring is accurate, and the life-span is long.

The utility model is achieved by the following technical solution: it comprises the differential pressure signal induction installation, bypass duct, outer tube, interior pipe and arm, bypass duct one end is provided with the air port, the other end is communicated with trunk line, interior pipe is installed in the bypass duct the inside, its top end opening is to living the air port, the afterbody of interior pipe stretches out from the side of bypass duct, outer tube is positioned in the bypass duct and is enclosed within the outside of pipe, outer tube top and bottom end seal, between outer tube and interior pipe, form enclosure space, the outer tube side offers the air inlet aperture, the outer tube side is stretched into and be connected in the arm top from the bypass duct outside, and the afterbody of arm and the afterbody of interior pipe are connected to the input end of differential pressure signal induction installation.

The utility model compared with prior art has following advantage: 1) its differential pressure signal from bypath system reflects the flow velocity signal of trunk line indirectly, has improved the degree of accuracy of monitoring, guarantees the stability of flow of trunk line better; 2) use indirect mode to monitor, the pressure that monitoring instrument is subjected to is less, prolongs the life-span of monitoring instrument; 3) monitoring device is simple in structure, reliable operation, and it is comparatively convenient to use, and manufacturing cost is lower.

4, description of drawings:

Below in conjunction with accompanying drawing the utility model is done detailed explanation:

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the force analysis figure that A is ordered among Fig. 1;

Fig. 3 is the force analysis figure that B is ordered among Fig. 1.

5, embodiment:

As shown in Figure 1, the utility model comprises differential pressure signal induction installation 1, bypass duct 2, outer tube 3, interior pipe 4 and arm 5, bypass duct 2 one ends are provided with air port 6, the other end is communicated with trunk line 7, interior pipe 4 is installed in bypass duct 2 the insides, its top end opening is to living air port 6, the afterbody of interior pipe 4 stretches out from the side of bypass duct 2, outer tube 3 is positioned at 2 li of bypass ducts and is enclosed within the outside of pipe 4, outer tube 3 tops and bottom end seal, between outer tube 3 and interior pipe 4, form enclosure space 9, outer tube 3 sides offer air inlet aperture 8, outer tube 3 sides are stretched into and be connected in arm 5 tops from bypass duct 2 outsides, and the afterbody of the afterbody of arm 5 and interior pipe 4 is connected to the input end of differential pressure signal induction installation 1.Differential pressure signal induction installation 1 can be bought on market, and it is actually a kind of differential pressure transmitter, and for example " the Pressure and Difference Pressure Transmitter DBCC115 series " of being dispatched from the factory by Tongbo Electrical Appliance Co., Ltd., Dandong City is just passable.

Principle of work of the present utility model is as follows: if connect trunk line 7 from bypass duct 2 one ends, form negative pressure system, the air pressure that is bypass duct 2 outsides is higher than trunk line 7 the inside air-flow air pressure, as Fig. 1, Fig. 2, shown in Figure 3, air-flow is that A names a person for a particular job and produces a pressure P 1 on the top of interior pipe 4, P1 is the parallel normal pressure of an existing and interior pipe 4, the wall pressure vertical with interior pipe 4 also arranged, the position that offers air inlet aperture 10 simultaneously in outer tube 3 sides is that the B point produces the wall pressure P2 perpendicular to outer tube 3, to obtain a pressure Δ P who is parallel to outer tube 3 thus, Δ P=P1-P2, Δ P becomes the V2 direct ratio with the flow velocity of air intake direction, be V2=a Δ P, when the sectional area of trunk line 7 is far longer than the sectional area of bypass duct 2, the air-flow velocity V1=bV2 of trunk line 7, be V1=ab Δ P (a, b is a constant), the conversion of signals of pressure reduction can be become electric signal by differential pressure signal induction installation 1, from realization the runner of trunk line 7 is monitored in real time, differential pressure signal induction installation 1 can be delivered to controller of fan 11 with the pressure reduction electric signal of measuring and handle, then by controller of fan 11 control blower fans 10, guarantee trunk line 7 stability of flows, the flow velocity of blower fan 10 major control trunk lines 7.

When the air pressure of bypass duct 2 outsides is lower than trunk line 7 the inside air-flow air pressure, form positive pressure system, its principle and negative pressure system are similar, but the direction of the outer tube in the negative pressure system 3, interior pipe 4 to be fallen turnback, make its top over against trunk line 7, here do not chat auspicious, negative pressure system can be used for containing powder and not containing the pipe monitoring of powder, and positive pressure system is mainly used in the monitoring to the pipeline that does not contain powder.

Claims

1, air velocity duct bypass monitoring device, it is characterized in that it comprises differential pressure signal induction installation (1), bypass duct (2), outer tube (3), interior pipe (4) and arm (5), bypass duct (2) one ends are provided with air port (6), the other end is communicated with trunk line (7), interior pipe (4) is installed in bypass duct (2) the inside, its top end opening is to living air port (6), the afterbody of interior pipe (4) stretches out from the side of bypass duct (2), outer tube (3) is positioned at bypass duct (3) lining and is enclosed within the outside of pipe (4), outer tube (3) top and bottom end seal, between outer tube (3) and interior pipe (4), form enclosure space (9), outer tube (3) side offers air inlet aperture (8), arm (5) stretches into and is connected to outer tube (3) side from bypass duct (2) outside, and the afterbody of the afterbody of arm (5) and interior pipe (4) is connected to the input end of differential pressure signal induction installation (1).