CN209485449U - A kind of flowmeter - Google Patents

Abstract

The utility model belongs to flow measurement technology field, specifically discloses a kind of flowmeter, comprising: measurement pipe；Throttling element, it is co-axially located in measurement pipe with measurement pipe, throttling element includes along the sequentially connected diversion division of fluid flow direction, interconnecting piece and tail contracting portion, the outer surface of diversion division is the paraboloid of revolution, and the diameter of diversion division is gradually increased along fluid flow direction, the outer diameter of interconnecting piece is equal to the maximum outside diameter of diversion division, the outer diameter in tail contracting portion is gradually reduced along fluid flow direction, the rear end of throttling element is provided in the axial direction with axial tracting pressuring hole, the rear end of axial tracting pressuring hole is connected to measurement pipe, the front end closing of axial impulse mouth；Positive pressure pipe is arranged in the upstream of throttling element, and is connected to measurement pipe；The position of measurement pipe corresponding connection parts is arranged in negative pressure pipe, and its lower end is connected to axial tracting pressuring hole.Flowmeter disclosed by the utility model, measurement stability is good, and measurement accuracy is high, and processing cost is low.

Description

A kind of flowmeter

Technical field

The utility model relates to flow measurement technology field more particularly to a kind of flowmeters.

Background technique

Flowmeter is a kind of common measuring instrumentss for measuring gas in pipeline, steam or fluid flow, extensive It applies in each field such as petroleum, chemical industry, water process, food and drink.With to flow measurement accuracy and area requirement get over Come it is higher, thus derived be suitable for all kinds of flowmeters for various purposes, such as differential pressure flowmeter, balance flow meter, Electromagnetic Flow Meter etc..

Differential pressure flowmeter is with a long history, is most widely used in all kinds of flow instruments.It is with Bernoulli equation and stream Dynamic continuity equation is basic principle, differential pressure caused by restricting element is flowed through by measuring fluids within pipes, in conjunction with known work Condition condition is to acquire flow.V-type cone flow meter is more common differential pressure flowmeter, and Fig. 1 is the V-type cone that the prior art provides The structural schematic diagram of flowmeter comprising measurement pipe 10, set on positive pressure pipe measurement pipe 10 tube wall and communicated with measurement pipe 10 20 and negative pressure pipe 30, and the V taper coaxial in measurement pipe 10 and with measurement pipe 10 is mounted on by cantilevered support rod 50 Throttling element 40, when the fluid full of 10 pipeline of measurement pipe, which flows through V tapered joint 40, flows part, a fluid stream will gradually taper up inner wall of the pipe Near, so that flow velocity be made to increase, static pressure decline then generates pressure difference, and flow velocity is bigger, pressure before and after V taper throttling element 40 Difference is bigger, so as to measure the uninterrupted for flowing through 10 pipeline of measurement pipe by the size of pressure difference.

V-type cone flow meter can make fluid not be sharply to shrink in pipeline, and the variation of Fluid pressure is more steady, but its Have the shortcomings that difficulty of processing is big, processing cost is high, and V taper 40 volumes of throttling element are larger, encounters high pressure or fast Jie of flow velocity Matter is easy to produce and falls off, and causes serious quality accident.

Utility model content

The purpose of this utility model is to provide a kind of flowmeters, to improve the measurement stability and measurement essence of flowmeter Degree.

To achieve the above object, the utility model adopts the following technical solutions:

A kind of flowmeter, comprising:

Measurement pipe；

Throttling element is co-axially located in the measurement pipe with the measurement pipe, and the throttling element includes along fluid flowing side To sequentially connected diversion division, interconnecting piece and tail contracting portion, the outer surface of the diversion division is the paraboloid of revolution, and the diversion division Diameter be gradually increased along the fluid flow direction, the outer diameter of the interconnecting piece is equal to the maximum outside diameter of the diversion division, institute The outer diameter for stating tail contracting portion is gradually reduced along the fluid flow direction, and the rear end of the throttling element is provided in the axial direction with axial impulse The rear end in hole, the axial direction tracting pressuring hole is connected to measurement pipe, the front end closing of the axial direction impulse mouth；

Positive pressure pipe is arranged in the upstream of the throttling element, and is connected to the measurement pipe；

The position that the measurement pipe corresponds to the interconnecting piece, and its lower end and the axial impulse is arranged in negative pressure pipe Hole connection.

Further, the outer surface in tail contracting portion is circular cone table top.

Further, the tail portion angle of throat in tail contracting portion is 120 °~150 °.

Further, the interconnecting piece radially offers radial leading pressing hole, radial leading pressing mouth lower end and the axis It is connected to the front end of impulse mouth, and sealing is plugged with pressure guiding pipe in the radial leading pressing mouth, the upper end of the pressure guiding pipe penetrates institute It states measurement tube wall and is tightly connected with the measurement pipe, the negative pressure pipe is arranged on the outer wall of the measurement pipe, and institute Negative pressure pipe is stated to be connected to the pressure guiding pipe.

Further, the positive pressure pipe and the negative pressure pipe are axially vertical with the measurement pipe.

Further, the distance between the positive pressure pipe and the negative pressure pipe are 1/2~2/3 times of measurement pipe Caliber.

Further, the distance between the positive pressure pipe and the negative pressure pipe are the pipe of 0.618 times of measurement pipe Diameter.

Further, the axial tracting pressuring hole and the measurement pipe are coaxially disposed.

Further, the both ends of the measurement pipe are sealedly connected with flange.

Further, supporting rib is connected between the measurement inside pipe wall outside the interconnecting piece.

The utility model has the beneficial effects that:

Flowmeter provided by the utility model can reduce fluid by the way that fairshaped diversion division is arranged on throttling element Flow separation when throttling element is flowed through, keeps fluid flowing more steady, to keep pressure drop more stable, difference pressuring loss is small, measurement Precision is high, and measurement stability is good；Meanwhile, it is capable to reduce the abrasion of throttling element, the service life of throttling element is improved, to improve stream The service life of meter；Furthermore the structure of throttling element is simple, and simple processing, cost is relatively low.

Detailed description of the invention

Fig. 1 is the structural schematic diagram for the V cone shaped flow meter that the prior art provides；

Fig. 2 is the structural schematic diagram of flowmeter provided by the embodiment of the utility model.

It is marked in figure as follows:

10- measurement pipe；20- positive pressure pipe；30- negative pressure pipe；40-V type bores throttling element；50- support rod；

1- measurement pipe；2- positive pressure pipe；3- negative pressure pipe；4- throttling element；41- diversion division；42- interconnecting piece；The contracting of 43- tail Portion；44- axial direction tracting pressuring hole；5- supporting rib；6- flange；7- pressure guiding pipe.

Specific embodiment

The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein Described specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It further needs exist for It is bright, part relevant to the utility model is illustrated only for ease of description, in attached drawing rather than entire infrastructure.

In the description of the present invention, unless otherwise clearly defined and limited, term " connected ", " connection ", " Gu It is fixed " it shall be understood in a broad sense, for example, it may be being fixedly connected, it may be a detachable connection, or integral；It can be mechanical connect It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary The interaction relationship of the connection in portion or two elements.For the ordinary skill in the art, it can be managed with concrete condition Solve the concrete meaning of above-mentioned term in the present invention.

In the present invention unless specifically defined or limited otherwise, fisrt feature the "upper" of second feature or it "lower" may include that the first and second features directly contact, and also may include that the first and second features are not direct contacts but lead to Cross the other characterisation contact between them.Moreover, fisrt feature includes above the second feature " above ", " above " and " above " One feature is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.First is special Sign is directly below and diagonally below the second feature including fisrt feature under the second feature " below ", " below " and " below ", or only Indicate that first feature horizontal height is less than second feature.

In the description of the present embodiment, term " on ", "lower", " right side ", etc. orientation or positional relationships be based on shown in attached drawing Orientation or positional relationship, be merely for convenience of description and simplification operation, rather than the device or element of indication or suggestion meaning It must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.This Outside, term " first ", " second " are only used to distinguish between description, and have no special meaning.

Fig. 2 is the structural schematic diagram of flowmeter provided by the embodiment of the utility model, and which are mainly applied to in pipeline The flow of the fluids such as liquid or gas measures.As shown in Fig. 2, flowmeter provided by the utility model includes measurement pipe 1, just Pressure pipe 2, negative pressure pipe 3 and throttling element 4 etc..

Measurement pipe 1 has identical as pipeline to be measured for positive pressure pipe 2, negative pressure pipe 3 and throttling element 4 to be arranged Caliber, and be connected among pipeline to be measured, to generate pressure difference variation after enabling flow through the throttling element 4 in measurement pipe 1, and Pressure differential detection is carried out after 3 pressure of positive pressure pipe 2 and negative pressure pipe and the uninterrupted for treating measurement pipeline measures.

The both ends of measurement pipe 1 are respectively connected with flange 6, to realize connection of the measurement pipe 1 in pipeline to be measured.Flange 6 is excellent Choosing is welded to connect with measurement pipe 1, to prevent fluid from leaking.In other embodiments, flange 6 can also pass through spiral shell with measurement pipe 1 Line connection, at this point, sealing element is provided between 1 end face of flange 6 and measurement pipe, to prevent fluid from leaking.

Measurement pipe 1 is internally provided with throttling element 4, and pressure difference variation is generated when enabling flow through throttling element 4.To reduce fluid Flow separation when flowing through throttling element 4 and the probability for reducing the generations such as turbulent flow, vortexs, improve the stability of flowing in measurement pipe 1 With the stationarity of pressure difference, in the present embodiment, throttling element 4 includes that diversion division 41, interconnecting piece are sequentially connected along fluid flow direction 42 and tail contracting portion 43.

The outer surface of diversion division 41 is the paraboloid of revolution, and the diameter of its front end to rear end gradually increases along fluid flow direction Greatly.The streamlined contour of diversion division 41 designs, and can reduce flow separation when fluid flows through throttling element 4, makes fluid flowing more Add steadily, to keep pressure drop more stable, difference pressuring loss is small, and measurement accuracy is high, and measurement stability is good；Meanwhile, it is capable to reduce section The abrasion of part 4 is flowed, the service life of throttling element 4 is improved, to improve the service life of flowmeter.

The outer surface of interconnecting piece 42 is cylindrical surface, and the outer diameter of interconnecting piece 42 is equal with the maximum outside diameter of diversion division 41.Even The setting of socket part 42, the connection being advantageously implemented between throttling element 4 and measurement pipe 1.Specifically, 42 outer wall of interconnecting piece and measurement pipe Supporting rib 5 is connected between 1 inner wall, supporting rib 5 plays the role of supporting to throttling element 4, on the one hand makes the center line of throttling element 4 It is overlapped with the central axis of measurement pipe 1, on the other hand improves connective stability of the throttling element 4 in measurement pipe 1, prevent big flow Under effect, throttling element 4 is flushed away or stress inclination.

The setting of supporting rib 5 can be improved positional stability of the conducting element in measurement pipe 1, to improve flowmeter Measurement accuracy and service life.In the present embodiment, supporting rib 5 can be set one, can also be between the circumferential direction of interconnecting piece 42 Every setting two or more, to improve the supporting role to throttling element 4.Supporting rib 5 can be welded to connect with throttling element 4, or be adopted The connection of other types of attachment such as it is threadedly coupled.

In this embodiment, it is preferred that the connection that smoothly transits between diversion division 41 and interconnecting piece 42, to reduce throttling element 4 Corner angle, reduce flow separation when fluid flows through throttling element 4.

The outer diameter in tail contracting portion 43 is gradually reduced along fluid flow direction, and the fluid by acceleration can be made diminishing logical The separation with tube wall boundary layer is postponed when road and accelerates to be pressurized, and the generation of vortex is greatly reduced, to reduce to the greatest extent The resistance and crushing of fluid flowing.In Fig. 2, the outer surface in tail contracting portion 43 is taper table top, in other embodiments, tail contracting portion 43 outer surface can be the paraboloid of revolution.In the present embodiment, the tail portion angle of throat in tail contracting portion 43 is preferably 120 °~150 °.

In the present embodiment, the rear end of throttling element 4 offers axial tracting pressuring hole 44 along its axis, and interconnecting piece 42 is radially Radial leading pressing hole is offered, the rear end of axial tracting pressuring hole 44 and the measurement pipe 1 in 4 downstream of throttling element circulate, axial tracting pressuring hole 44 It closes and is connected to the lower end in radial leading pressing hole in front end.Sealing is plugged with pressure guiding pipe 7, the lower end of pressure guiding pipe 7 in radial leading pressing hole It protrudes into radial leading pressing hole, upper end penetrates the tube wall of measurement pipe 1, and seals and be welded to connect with measurement pipe 1.

Positive pressure tappings and negative pressure tappings are provided on the tube wall of measurement pipe 1, positive pressure tappings are located at the upstream of throttling element 4, bear Pressure tappings are formed by the upper end opening of pressure guiding pipe 7.Measurement pipe 1 is connected with the positive pressure being connected to positive pressure tappings at positive pressure tappings Pipe 2, is connected with the negative pressure pipe 3 being connected to negative pressure tappings at negative pressure tappings, and positive pressure pipe 2 and negative pressure pipe 3 with survey Buret 1 it is axially vertical.Positive pressure pipe 2 and negative pressure pipe 3 are connect by impulse valve, three valve groups with pressure difference transmitter, acquisition To positive/negative-pressure signal guide in pressure difference transmitter respectively, carry out 4 front and back end of throttling element pressure difference calculating.

In the present embodiment, the distance between 1 end face of measurement pipe of the positive pressure tappings apart from its front end is 20mm~30mm, is being protected While demonstrate,proving the stationarity of fluid inflow measurement pipe 1, reduce the length of measurement pipe 1.It is further preferable that positive pressure tappings are apart from front end 1 end face of measurement pipe distance be 25mm.

In the present embodiment, the distance between positive pressure pipe 2 and negative pressure pipe 3 are 1/4~1 times of 1 caliber of measurement pipe, and excellent It is selected as the caliber of 1/2~2/3 times of measurement pipe 1, optimal is 0.618 times of 1 caliber of measurement pipe, and the measurement that can be improved flowmeter is stablized Performance is good, and reduction measurement crushing is low, improves measurement effect.

In the present embodiment, the maximum outside diameter of throttling element 4, the length of diversion division 41, the length of throttling element 4 are because according to specific Test Cycle and 1 diameter of measurement pipe are specifically designed, and this kind of design method is ordinary skill in the art means, this implementation Example is no longer repeated.

Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting Understand, the utility model is not limited to specific embodiment described here, is able to carry out for a person skilled in the art various bright Aobvious variation, readjustment and substitution is without departing from the protection scope of the utility model.Therefore, although passing through above embodiments The utility model is described in further detail, but the utility model is not limited only to above embodiments, is not departing from It can also include more other equivalent embodiments in the case that the utility model is conceived, and the scope of the utility model is by appended Scope of the claims determine.

Claims (10)

1. a kind of flowmeter characterized by comprising

Measurement pipe (1)；

Throttling element (4) is co-axially located in the measurement pipe (1) with the measurement pipe (1), and the throttling element (4) includes along stream The sequentially connected diversion division in body flow direction (41), interconnecting piece (42) and tail contracting portion (43), the outer surface of the diversion division (41) Diameter for the paraboloid of revolution, and the diversion division (41) is gradually increased along the fluid flow direction, the interconnecting piece (42) Outer diameter be equal to the diversion division (41) maximum outside diameter, the outer diameter in tail contracting portion (43) along the fluid flow direction gradually Reduce, the rear end of the throttling element (4) is provided in the axial direction with axial tracting pressuring hole (44), the rear end of the axial direction tracting pressuring hole (44) with Measurement pipe (1) connection, the front end closing of the axial direction tracting pressuring hole (44)；

Positive pressure pipe (2), setting are connected in the upstream of the throttling element (4), and with the measurement pipe (1)；

Negative pressure pipe (3) is arranged in the position of the measurement pipe (1) the corresponding interconnecting piece (42), and its lower end and the axis It is connected to tracting pressuring hole (44).

2. flowmeter according to claim 1, which is characterized in that the outer surface in tail contracting portion (43) is circular cone table top.

3. flowmeter according to claim 1 or 2, which is characterized in that the tail portion angle of throat in tail contracting portion (43) is 120 °~150 °.

4. flowmeter according to claim 1, which is characterized in that the interconnecting piece (42) radially offers radial leading pressing Hole, radial leading pressing hole lower end is connected to the front end of the axial tracting pressuring hole (44), and is sealed and inserted in the radial leading pressing hole It is connected to pressure guiding pipe (7), the upper end of the pressure guiding pipe (7), which penetrates the measurement pipe (1) tube wall and seals with the measurement pipe (1), to be connected It connects, the negative pressure pipe (3) is arranged on the outer wall of the measurement pipe (1), and the negative pressure pipe (3) and the pressure guiding pipe (7) it is connected to.

5. flowmeter according to claim 1, which is characterized in that the positive pressure pipe (2) and the negative pressure pipe (3) are equal It is axially vertical with the measurement pipe (1).

6. flowmeter according to claim 5, which is characterized in that the positive pressure pipe (2) and the negative pressure pipe (3) it Between distance be 1/2~2/3 times of measurement pipe (1) caliber.

7. flowmeter according to claim 6, which is characterized in that the positive pressure pipe (2) and the negative pressure pipe (3) it Between distance be 0.618 times of measurement pipe (1) caliber.

8. flowmeter according to claim 1, which is characterized in that the axial direction tracting pressuring hole (44) and the measurement pipe (1) Coaxial arrangement.

9. flowmeter according to claim 1, which is characterized in that the both ends of the measurement pipe (1) are sealedly connected with method Blue (6).

10. flowmeter according to claim 1, which is characterized in that interconnecting piece (42) outside and the measurement pipe (1) Supporting rib (5) are connected between inner wall.