CN2334017Y

CN2334017Y - Flow sensor

Info

Publication number: CN2334017Y
Application number: CN 98228493
Authority: CN
Inventors: 周德福
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-03-23
Filing date: 1998-03-23
Publication date: 1999-08-18
Anticipated expiration: 2008-03-23

Abstract

The utility model relates to a flow sensor. A shell is provided with an impeller 6 inside. An upper plate 12 can rotate synchronously with the impeller 6. Strip-shaped teeth on the upper plate 12 enables a phototube to continuously conduct. The shell is divided into an upper cavity and a lower cavity by a partition plate. A fixed shaft 8 is embedded on the partition plate. An internal sleeve 4 is positioned in the lower cavity of the shell. The impeller 6 is positioned in the internal sleeve 4. The lower end of an impeller shaft 7 extends into a shaft sleeve 5 and the upper end of the impeller shaft 7 is sphere shaped and is in contact with the lower end of the fixed shaft 8. The upper end of the fixed shaft 8 extends into the upper cavity of the shell and is positioned in a shaft sleeve of the upper plate 12. A lower plate 9 is fixed on the upper end of the impeller 6. The upper plate and the lower plate are embedded with magnetic steels 10 with opposite poles in a one-to-one correspondence form.

Description

Flow sensor

The utility model is relevant with the photo-electric flow sensor, and is especially relevant with small-bore flow sensor.

In the housing of existing flow sensor impeller is housed, dish and impeller with bar shaped tooth rotate synchronously, make photoelectric tube conducting and disconnection, and the electric signal frequency of its generation is directly proportional with flow, by measurable instantaneous delivery of the effect of secondary instrument and average discharge.Volume is big, and bore is big, complex structure, manufacturing cost height.The working pressure that needs is big, can't work when low pressure.The photoelectric tube of existing flow sensor fluid direct and that housing is interior contacts, and escape of liquid takes place easily for assembling and use inconvenience, influences mission life.

It is little that the purpose of this utility model provides a kind of physical dimension, simple in structure, easy to manufacture, with low cost, do not leak, the flow sensor of long working life, another purpose of the present invention provides a kind of small-bore flow sensor that can operate as normal under low-pressure.

The utility model is achieved in that impeller 6 in the housing of the present utility model, there is the dish of going up 12 to rotate synchronously with impeller 6, last dish 12 has tooth to make photoelectric tube 13 interrupted conductings, housing is divided into by dividing plate, cavity of resorption, stationary shaft 8 is embedded on the dividing plate, interior cover 4 is loaded in the housing cavity of resorption, impeller 6 is positioned at cover 4, in the axle sleeve 5 that the lower end of impeller shaft 7 puts in stretching into, the following end in contact of upper end and stationary shaft 8, the upper end of stationary shaft 8 is stretched into epicoele and is connected with the axle sleeve of last dish 12, and lower wall 9 is fixed on the upper end of impeller 6, on, be embedded with corresponding one by one on the lower wall, opposite polarity magnet steel 10.

Housing of the present utility model is by the lower cover 2 of bringing hose nozzle into, takes the shell 3 and the loam cake 11 of hose nozzle out of and forms, and dividing plate and shell 3 fuse, and the upper end of interior cover 4 withstands on the dividing plate upper and lower end and withstands on the cylinder 14 that lower cover 2 protrudes upward.

The utility model stationary shaft 8 and axle sleeve are metalwork, and all the other parts are the ABS plastic injection molded, adopt the connecting of shell 3 and lower cover 2, loam cake 11 and impeller 6 and lower wall 9 bondingly, and the nominal bore is 10mm.

The utility model is simple in structure, and most of part can injection molded, makes assembling easily, and is with low cost.The utility model structure is convenient to miniaturization, and it is little to make overall dimensions, and bore is little, and the product that precision is high is suitable at low-pressure fluid, and is small-bore, uses under the small flow rate.Electric part of the present utility model and fluid are isolated fully, can not damage because of escape of liquid.

Following is accompanying drawing of the present utility model:

Fig. 1 is a structural drawing of the present utility model.

Following is embodiment of the present utility model:

The utility model is small-bore flow sensor, by the lower cover 2 that has water inlet pipe, the shell 3 and the loam cake 11 that have effluent pipe mouth are formed sensor housing, the dividing plate that fuses at the upper end-face edge place and the shell 3 of effluent pipe mouth is divided into two chambeies up and down with enclosure interior, there is a stationary shaft 8 at the dividing plate center, two chambeies are up and down stretched at stationary shaft 8 two ends respectively, the interior cover 4 that current is played guide functions is housed in the cavity of resorption, three garden posts 14 that extend upwardly are arranged on the lower cover 2, these three garden posts withstand interior cover and make it in place, dress impeller 6 in the interior cover, the upper end of impeller connects lower wall 9, embed three thin garden cylindricality magnet steel 10 on the lower wall, epicoele dress periphery coils 12 for going up of bar shaped tooth, photoelectric tube 13 is inserted in perforate on the epicoele shell wall, make photoelectric tube in place in the bar shaped tooth footpath the position on, the magnet steel 10 of three thin garden cylindricalitys also is housed on the last dish 12, each three its S of magnet steel of upper lower burrs, the N utmost point and position homogeneous one correspondence, on coil and have axle sleeve 5, be inserted on the stationary shaft 8 that puts in epicoele, the axle sleeve bottom is 120 ° of conical surfaces, center SR0.4, the both ends of stationary shaft are SR0.2, therefore go up the dish axle sleeve except that playing the guiding role, dish is rotated with a contact on stationary shaft 8, to reduce frictional resistance, improve sensitivity, impeller 6 is inserted on the stationary shaft 8 that puts in cavity of resorption, the end that the minor axis 7 at impeller center contacts with stationary shaft 8 is a sphere, therefore impeller 6 and stationary shaft 8 also are to contact, in the axle sleeve 5 in the lower end of impeller shaft 7 is stretched into and is embedded on the cover 4, play the guiding role, the kinetic energy that hydrodynamic pressure produces during flow, promote impeller 6 rotations, because the drive of three pairs of magnet steel 10, last dish 12 rotates with a way of contact on same stationary shaft 8 synchronously with impeller 6, its rotating speed is directly proportional with flow velocity, because the rotation of last dish 12, on the bar shaped tooth that coils make photoelectric tube 13 interrupted conductings, in the same period, the number of times of photoelectric tube conducting promptly corresponds to flow value, is handled by secondary instrument.

The small-bore flow sensor of the utility model is applicable to clean liquid and gases such as water, gasoline.

The sensor of bore φ below 15, except that axle and axle sleeve, the whole available plastics of material adopt between shell and the upper and lower cover and between impeller and the lower wall bonding, when shell and upper and lower cover are used metal charge, then adorn O-ring seal with screw attachment and between shell and lower cover.

The advantage of the small-bore flow sensor of the utility model is that physical dimension is little, and cheap, precision is higher, is applicable under low-pressure fluid, small-bore, the small flow rate to use.

Below in conjunction with accompanying drawing embodiment is described further.

Sensor is fixed on the nut of using on the frame 1, the lower cover 2 of sensor housing, under cover and have the admitting pipe joint screw thread, the top of lower cover also has three uniform garden posts 14, the shell 3 that has titting water outlet, in the upper end of water delivering orifice one dividing plate is arranged, this dividing plate is divided into two chambeies up and down with enclosure interior, at the center of dividing plate stationary shaft 8 is arranged, because stationary shaft 8 is to be injection-moulded on the shell 3 as inserts, the epicoele so the water of cavity of resorption can not bleed, the titting water outlet of shell 3 connects with flange, the guide functions of 4 current of interior cover, the upper end of interior cover 4 withstands on the dividing plate of shell 3, the lower end withstands on three garden posts that lower cover 2 stretches out, cover 4 is in place stable in making, 5 is axle sleeve, 6 is impeller, and 7 is impeller shaft, and the upper end of impeller shaft is a sphere, axle sleeve 5 is stretched in the lower end, 9 is lower wall, is fixed on the upper end of impeller 6, and lower wall 9 is embedded with three uniform magnet steel 10,11 is loam cake, 12 is last dish, and the periphery of last dish makes wide bar shaped tooth, on coil and also be embedded with three magnet steel 10 on 12, these three magnet steel are coaxial with three magnet steel positions of lower wall 9, axle sleeve on the last dish 12 is a photoelectric tube with 5,13, model ITR8105, opening part by shell 3 inserts, and the insertion position makes the emission of photoelectric tube, receive path on the middle footpath of last dish 12 microscler teeth.

Claims

1, a kind of flow sensor, impeller 6 is arranged in the housing, there is the dish of going up (12) to rotate synchronously with impeller (6), last dish (12) has tooth to make the interrupted conducting of photoelectric tube (13), it is characterized in that housing is divided into by dividing plate, cavity of resorption, stationary shaft (8) is embedded on the dividing plate, interior cover (4) is loaded in the housing cavity of resorption, impeller (6) is positioned at cover (4), in the axle sleeve (5) that the lower end of impeller shaft (7) puts in stretching into, the following end in contact of upper end and stationary shaft (8), the upper end of stationary shaft (8) is stretched into epicoele and is connected with the axle sleeve of last dish (12), lower wall (9) is fixed on the upper end of impeller (6), on, be embedded with corresponding one by one on the lower wall, opposite polarity magnet steel (10).

2, flow sensor according to claim 1, it is characterized in that housing is by the lower cover of bringing hose nozzle into (2), taking the shell (3) and the loam cake (11) of hose nozzle out of forms, dividing plate and shell (3) fuse, and the upper end of interior cover (4) withstands on the dividing plate upper and lower end and withstands on the cylinder (14) that lower cover (2) protrudes upward.

3, flow sensor according to claim 1 and 2, it is characterized in that stationary shaft (8) and axle sleeve (5) are metalwork, all the other parts are the ABS plastic injection molded, adopt the connecting of shell (3) and lower cover (2), loam cake (11) and impeller (6) and lower wall (9) bondingly, and the nominal bore is 10mm.