CN213021759U - Plug-in differential pressure flowmeter - Google Patents
Plug-in differential pressure flowmeter Download PDFInfo
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- CN213021759U CN213021759U CN202022176097.5U CN202022176097U CN213021759U CN 213021759 U CN213021759 U CN 213021759U CN 202022176097 U CN202022176097 U CN 202022176097U CN 213021759 U CN213021759 U CN 213021759U
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Abstract
The utility model discloses an insertion type differential pressure flowmeter, which comprises an insertion type primary device and a secondary instrument; the plug-in primary device comprises two variable measuring tubes, wherein the plug-in ends of the two variable measuring tubes are provided with differential pressure type flow velocity measuring heads, and the differential pressure type flow velocity measuring heads are provided with static pressure tapping holes and full pressure tapping holes; the temperature sensor and the differential pressure transmitter are arranged at the external end of the two-variable measuring tube, a static pressure guide channel and a full pressure guide channel are arranged in the two-variable measuring tube, and a temperature measuring head of the temperature sensor is inserted into the two-variable measuring tube; a pressure transmitter; the insertion sealing device is provided with a pressure guide channel for communicating a pressure guide pipe of the pressure transmitter with the metering pipeline; the secondary instrument can calculate the flow of the fluid in the metering pipeline according to the data measured by the temperature sensor, the differential pressure transmitter and the pressure transmitter. The utility model discloses can simultaneous measurement measure the interior fluid velocity of flow of measurement pipeline, temperature, pressure, only need set up a mounting hole on the measurement pipeline, the installation and maintain simple more, convenient.
Description
Technical Field
The utility model relates to a fluid measurement technical field, more specifically say, relate to a bayonet differential pressure flowmeter.
Background
The differential pressure flowmeter is a large type of flowmeter widely applied in the technical field of flow measurement. Of these, a plug-in differential pressure flowmeter is widely used for flow measurement of a large-diameter pipe.
The plug-in differential pressure flowmeter consists of a primary device and a secondary instrument. After the primary device is inserted into the metering pipeline, the flow rate of the fluid at a specific position in the metering pipeline is measured and output in the form of a differential pressure signal. The secondary instrument firstly calculates the average flow velocity of the fluid in the cross section of the metering pipeline according to a differential pressure signal generated by the flow velocity output by the primary device, and further calculates the flow of the fluid in the metering pipeline.
The large-caliber measured pipelines which are actually operated on site are mostly in a low-flow-rate operation state; the average flow speed of the measured pipeline fluid is near the lower limit of the flow speed range of the plug-in differential pressure flowmeter or lower than the lower limit of the flow speed range of the plug-in differential pressure flowmeter. When the above conditions occur, the differential pressure value output by the plug-in differential pressure flowmeter is probably only about 10-20 Pa, even less than 10 Pa; in this case, even if the industrial grade micro differential pressure transmitter with the highest sensitivity is used, the conversion accuracy is not sufficient. The key point is that the small differential pressure value is attached with large-amplitude and irregular fluctuating differential pressure noise, and sometimes the amplitude of the fluctuation of the differential pressure noise is even larger than the differential pressure value per se; causing metering failure.
Before the plug-in differential pressure type flowmeter measures the fluid flow, the accurate fluid density needs to be determined; this requires that the pressure and temperature of the fluid in the pipe be accurately measured while measuring the flow rate of the fluid at a particular location in the pipe being metered. For this reason, the practical primary differential pressure type flowmeter apparatus further includes: the temperature sensor and the pressure sensor are used for measuring the pressure of the fluid in the pipeline and the temperature of the fluid in the pipeline.
Therefore, when the plug-in differential pressure type flowmeter is installed on the field metering pipeline, three installation holes are usually required to be formed in the metering pipeline, and the flow velocity measuring tube, the temperature sensor and the pressure sensor of the plug-in differential pressure flowmeter are respectively installed, so that the installation and maintenance difficulty of the instrument is increased, and the construction workload is increased.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention is directed to an insertion differential pressure flowmeter to solve the problem of high difficulty in installation and maintenance when the pressure difference, temperature and pressure of the fluid in the pipeline are measured.
In order to achieve the above object, the utility model discloses a following technical scheme:
an insertion type differential pressure flowmeter comprises an insertion type primary device and a secondary instrument;
the plug-in primary device comprises:
the measuring device comprises a two-variable measuring tube, a differential pressure type flow velocity measuring head and a measuring pipe, wherein the two-variable measuring tube is inserted into a metering pipeline, the insertion end of the two-variable measuring tube is provided with the differential pressure type flow velocity measuring head, and the differential pressure type flow velocity measuring head is provided with a static pressure tapping hole and a full pressure tapping hole which are used for measuring differential pressure generated by fluid flow velocity;
the temperature sensor and the differential pressure transmitter are arranged at the external end of the two-variable measuring tube, a static pressure guide channel for communicating the static pressure taking hole with the static pressure side input end of the differential pressure transmitter and a full pressure guide channel for communicating the full pressure taking hole with the full pressure side input end of the differential pressure transmitter are arranged in the two-variable measuring tube, and a temperature measuring head of the temperature sensor is inserted into the two-variable measuring tube at a position close to the differential pressure type flow velocity measuring head;
the pressure transmitter is used for measuring the fluid pressure at the gap between the measuring hole formed on the measuring pipeline and the outer wall of the two-variable measuring pipe;
the insertion sealing device is used for insertion/extraction operation, fixing and sealing of the two-variable measuring pipe on the metering pipeline, and is provided with a measuring pipe perforation for the two-variable measuring pipe to pass through and a pressure guide channel for communicating a pressure guide pipe of the pressure transmitter with the metering pipeline;
the secondary instrument is connected with the differential pressure transmitter, the temperature sensor and the pressure transmitter, and can calculate the flow of the fluid in the metering pipeline according to the data measured by the differential pressure transmitter, the temperature sensor and the pressure transmitter.
Preferably, in the above-mentioned insertion type differential pressure flow meter, the differential pressure type flow velocity measuring head is cylindrical and coaxial with the two variable measuring tubes;
the full-pressure tapping hole is arranged on the incident side of the differential pressure type flow velocity measuring head, and the axis of the full-pressure tapping hole is perpendicular to and intersected with the axis of the differential pressure type flow velocity measuring head.
Preferably, in the above insertion type differential pressure flowmeter, the outer peripheral surface of the differential pressure type flow velocity measurement head is provided with two contraction guide grooves, a normal line of the center of the port of the full pressure tapping hole perpendicularly intersects with the axis of the differential pressure type flow velocity measurement head, and the two contraction guide grooves are symmetrically arranged on two sides of a longitudinal plane formed by the normal line of the center of the port of the full pressure tapping hole and the axis of the differential pressure type flow velocity measurement head.
Preferably, the contraction guide groove is sequentially divided into a contraction section and a measurement section along the flow direction of the fluid;
the flow guide sectional area of the contraction section is gradually reduced along the flow direction of the fluid, and the flow guide sectional area of the measurement section is unchanged along the flow direction of the fluid; the static pressure tapping hole is positioned in the measuring section.
Preferably, in the above plug-in differential pressure flowmeter, the distance between the two constrictions at the upstream end is smaller than the distance between the two constrictions at the downstream end.
Preferably, in the above plug-in differential pressure flowmeter, the constricted section is wedge-shaped.
Preferably, in the above-mentioned plug-in differential pressure flowmeter, a normal line of a center of the static pressure tapping hole port is perpendicular to a normal line of a center of the full pressure tapping hole port, and is coplanar with a centerline of the contraction section and a centerline of the measurement section;
the static pressure tapping hole penetrates through the two measuring sections.
Preferably, in the above-described insertion-type differential pressure flow meter, a gap between the measurement pipe penetration hole and the two variable measurement pipes forms the pressure guide passage;
the two-variable measuring tube comprises an outer tube and an inner tube sleeved in the outer tube, the tube hole of the inner tube forms the full-pressure guide channel, the pipeline gap between the outer wall of the inner tube and the inner wall of the outer tube forms the static-pressure guide channel, and the temperature measuring head is positioned in the static-pressure guide channel.
Preferably, in the above insertion-type differential pressure flowmeter, the insertion seal device includes:
the fixed base is hermetically fixed on the outer wall of the flow meter insertion hole of the metering pipeline;
the control valve is arranged at one end of the fixed base, which is far away from the metering pipeline, and is opened when the two variable measuring pipes are inserted into the metering pipeline; when the two-variable measuring pipe is pulled out of the metering pipeline, the control valve is closed;
the sealing base is arranged at one end of the control valve, which is far away from the fixed base, and the sealing base can be used for the insertion of the two variable measuring pipes and the sealing matching of the two variable measuring pipes;
the pressure guide pipe of the pressure transmitter is arranged at one end, far away from the flowmeter insertion hole, of the sealing base through a stop valve.
Preferably, in the above-mentioned plug-in differential pressure flowmeter, the external end of the two-variable measuring tube is provided with a two-variable connecting seat, and the temperature sensor and the differential pressure transmitter are both arranged on the two-variable connecting seat;
the two-variable connecting base is provided with a first channel for communicating the full-pressure side input end of the differential pressure transmitter with the full-pressure guide channel, a second channel for communicating the static-pressure side input end of the differential pressure transmitter with the static-pressure guide channel, and a temperature sensor mounting hole for the temperature measuring head to penetrate through.
According to the above technical scheme, the utility model discloses an bayonet differential pressure flowmeter includes bayonet primary importance, secondary instrument.
When in use, the inserting sealing device is arranged at the flowmeter inserting hole of the metering pipeline to realize the sealing connection between the inserting sealing device and the flowmeter inserting hole, then the differential pressure type flow velocity measuring head and the temperature measuring head of the plug-in primary device are inserted into the measuring pipeline together with the two variable measuring pipes through the measuring pipe perforation of the plug-in sealing device, at the moment, the static pressure tapping hole and the full pressure tapping hole of the differential pressure type flow velocity measuring head and the temperature measuring head of the temperature sensor are all positioned in the measuring pipeline, so that, the static pressure signal of the fluid in the metering pipeline can be collected to the static pressure side input end of the differential pressure transmitter through the static pressure guide channel by using the static pressure taking hole, and the full pressure signal of the fluid in the metering pipeline is collected to the full pressure side input end of the differential pressure transmitter through the full pressure guide channel by using the full pressure taking hole, so that a differential pressure signal delta P generated by the flow velocity of the fluid in the metering pipeline at the inserting position is obtained; meanwhile, a temperature measuring head of the temperature sensor is used for detecting a fluid temperature signal T in the metering pipeline; collecting a fluid pressure signal P in the metering pipeline to a pressure guide pipe of a pressure transmitter by using a pressure guide passage inserted into the sealing device, and measuring the fluid pressure in the metering pipeline by using the pressure transmitter; therefore, the flow velocity (differential pressure) delta P, the pressure P and the temperature T of the fluid in the metering pipeline at the inserting position can be measured simultaneously; and calculating the average flow velocity of the fluid in the cross section of the metering pipeline at the installation position of the plug-in differential pressure flowmeter by using a secondary instrument according to the flow velocity (differential pressure) delta P, the pressure P and the temperature T, and further calculating the flow of the fluid in the pipeline.
To sum up, the utility model discloses a bayonet differential pressure flowmeter can simultaneous measurement measure the interior fluid velocity of flow of measurement pipeline, temperature, pressure, so, only need set up a mounting hole on the measurement pipeline, has not only reduced the construction work volume, still makes installation and maintenance simple more, convenient, has reduced instrument installation maintenance cost moreover.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an insertion differential pressure flowmeter according to an embodiment of the present invention;
FIG. 2 is a schematic view of a plug-in primary unit and a plug-in seal unit according to an embodiment of the present invention;
fig. 3 is a front view of a differential pressure type flow velocity measuring head disclosed in the embodiment of the present invention;
fig. 4 is a cross-sectional view of the present invention taken along line a-a of fig. 3;
fig. 5 is a side view of a differential pressure type flow velocity measuring head disclosed in the embodiment of the present invention;
fig. 6 is a cross-sectional view taken along line B-B of fig. 5;
fig. 7 is a schematic cross-sectional view of a flow-facing end of a contraction guide groove disclosed in an embodiment of the present invention;
fig. 8 is a schematic cross-sectional view of a back flow end of a converging guide groove according to an embodiment of the present invention.
Wherein, in the above fig. 1-8:
1-inserting a primary device, 2-a secondary instrument, 3-a metering pipeline and 4-inserting a sealing device;
11-a two-variable measuring tube, 112-a full pressure guide channel, 113-a static pressure guide channel, 12-a differential pressure type flow velocity measuring head, 121-a contraction section, 122-a full pressure tapping hole, 123-a static pressure tapping hole, 124-a measuring section, 13-a two-variable connecting seat, 14-a differential pressure transmitter, 15-a temperature sensor, 151-a temperature measuring head, 16-a pressure transmitter, 41-a fixed base, 42-a control valve and 43-a sealing base;
Δ P-flow rate (differential pressure) signal, P-in-line fluid pressure signal, T-in-line fluid temperature signal;
s1-effective sectional area of inlet end of the contraction diversion trench, and S2-effective sectional area of outlet end of the contraction diversion trench.
The line B-B in fig. 6 forms a cross section in which the normal to the center of the full-pressure tapping port, the normal to the center of the static-pressure tapping port, and the center lines of the two converging guide grooves are located.
The Y-two variable measuring tube and the differential pressure type flow velocity measuring head are coaxial with the cylindrical structure;
fa-normal of the center of the full-pressure tapping hole port, Fb-normal of the center of the static-pressure tapping hole port.
Detailed Description
The embodiment of the utility model discloses bayonet differential pressure flowmeter has solved when needs measure the interior fluidic pressure differential of pipeline, temperature, pressure, the installation of existence and the big problem of the maintenance degree of difficulty.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-8, an insertion differential pressure flowmeter according to an embodiment of the present invention includes an insertion primary device 1 and a secondary meter 2.
The plug-in primary device 1 comprises a two-variable measuring tube 11 inserted into the metering pipeline 3, the insertion end of the two-variable measuring tube 11 is provided with a differential pressure type flow velocity measuring head 12, and the differential pressure type flow velocity measuring head 12 is provided with a static pressure tapping hole 123 and a full pressure tapping hole 122 which are used for measuring the differential pressure generated by the flow velocity of the fluid; the temperature sensor 15 and the differential pressure transmitter 14 are arranged at the external end of the two-variable measuring pipe 11, a static pressure guide channel 113 for communicating the static pressure taking hole 123 with the static pressure side input end of the differential pressure transmitter 14 and a full pressure guide channel 112 for communicating the full pressure taking hole 122 with the full pressure side input end of the differential pressure transmitter are arranged in the two-variable measuring pipe 11, and the temperature measuring head 151 of the temperature sensor 15 is inserted into the two-variable measuring pipe 11 at a position close to the differential pressure type flow velocity measuring head 12; a pressure transmitter 16 for measuring the pressure of the fluid in the gap between the measuring hole formed in the measuring pipe 3 and the outer wall of the two-variable measuring pipe 11; the insertion sealing device 4 is used for insertion/extraction operation, fixing and sealing of the two-variable measuring pipe 11 on the metering pipeline 3, and the insertion sealing device 4 is provided with a measuring pipe perforation for the two-variable measuring pipe 11 to pass through and a pressure guide channel for communicating a pressure guide pipe of the pressure transmitter 16 with the metering pipeline 3; the secondary instrument 2 is connected with the differential pressure transmitter 14, the temperature sensor 15 and the pressure transmitter 16, and can calculate the flow of the fluid in the metering pipeline 3 according to the data measured by the differential pressure transmitter 14, the temperature sensor 15 and the pressure transmitter 16.
The two-variable measuring tube 11 of the plug-in primary unit 1 has a function of being able to be inserted into and removed from the measuring pipe 3.
The inserting end and the external end of the two-variable measuring tube 11 are two ends of the two-variable measuring tube 11 along the axial direction respectively, and when the inserting end of the two-variable measuring tube 11 is inserted into the metering pipeline 3, the external end of the two-variable measuring tube 11 is positioned outside the metering pipeline 3; the two-variable measuring tube 11 is an extension of the differential pressure type flow velocity measuring head 12 and also a sheath of the temperature measuring head 151 of the temperature sensor 15.
The differential pressure type flow velocity measuring head 12 is based on the pitot-static pressure tube principle, has a smaller pipeline blocking area, reduces the pipeline blocking area, can reduce the resistance to the fluid in the pipeline, and is beneficial to ensuring the flow field characteristic of the fluid in the pipeline. The differential pressure type flow rate probe 12 has a full pressure sampling hole 122 and a static pressure sampling hole 123, which are used to measure the full pressure and the static pressure generated by the fluid velocity respectively and output in the form of differential pressure, i.e. the differential pressure Δ P generated by the fluid velocity.
The temperature transmitter-junction box of the temperature sensor 15 is exposed at the outer end of the two-variable measuring tube 11. The differential pressure transmitter 14 is provided with three measuring valve groups; the pressure transmitter 16 is provided with a stop valve, the pressure transmitter 16 is externally arranged on the insertion sealing device 4, and the fluid pressure in the metering pipeline 3 is measured through the measuring pipe perforation of the insertion sealing device 4.
The plug-in sealing device 4 is used for facilitating the plug-in and the pull-out of the secondary variable measuring tube 11 of the plug-in primary device 1 on the metering pipeline 3, ensuring the sealing between the secondary variable measuring tube 11 and the metering pipeline 3 and preventing the fluid in the metering pipeline 3 from leaking; another function of the plug-in seal 4 is to collect the fluid pressure at the pipe wall of the metering pipe 3 and transmit it to the pressure transmitter 16.
When in use, firstly, the inserting sealing device 4 is arranged at the position of the flow meter inserting hole of the measuring pipeline 3 to realize the sealing connection of the inserting sealing device 4 and the flow meter inserting hole, then the differential pressure type flow velocity measuring head 12 and the temperature measuring head 151 of the inserting primary device 1 are inserted into the measuring pipeline 3 together with the two variable measuring pipes 11 through the measuring pipe penetrating holes of the inserting sealing device 4, at the moment, the static pressure tapping hole 123, the full pressure tapping hole 122 and the temperature measuring head 151 of the temperature sensor 15 of the differential pressure type flow velocity measuring head 12 are all positioned in the measuring pipeline 3, thus, the static pressure signal of the fluid in the measuring pipeline 3 can be collected to the static pressure side input end of the differential pressure transmitter 16 through the static pressure guide channel 113 by the static pressure tapping hole 123, the full pressure signal of the fluid in the measuring pipeline 3 can be collected to the full pressure side input end of the differential pressure transmitter 14 through the full pressure guide channel 112, further obtaining a differential pressure signal delta P generated by the flow velocity of the fluid in the metering pipeline 3 at the inserting position; meanwhile, a temperature measuring head 151 of the temperature sensor 15 is used for detecting a fluid temperature signal T in the metering pipeline 3; a pressure guide pipe of a pressure transmitter 16 is used for collecting a fluid pressure signal P in the metering pipeline 3 by using a pressure guide passage inserted into the sealing device 4, and the pressure transmitter 16 is used for measuring the fluid pressure in the metering pipeline 3; thereby simultaneously measuring the flow velocity (differential pressure) delta P, the pressure P and the temperature T of the fluid in the metering pipeline 3 at the inserting position; and the secondary instrument 2 is used for calculating the average flow velocity of the fluid in the cross section of the metering pipeline 3 at the installation position of the plug-in differential pressure flowmeter according to the flow velocity (differential pressure) delta P, the pressure P and the temperature T, and further calculating the flow of the fluid in the pipeline.
To sum up, the utility model discloses a bayonet differential pressure flowmeter can simultaneous measurement measure the interior fluid velocity of flow, temperature, pressure of measurement pipeline 3, so, only need set up a mounting hole on measurement pipeline 3, not only reduced the construction work volume, still make installation and maintenance simple more, convenient, reduced instrument installation maintenance cost moreover.
Furthermore, the utility model discloses a higher, the fault rate is lower, the reliable operation of bayonet differential pressure flowmeter integration level.
The secondary instrument 2 is a special flow computer, the flow computer collects the differential pressure, pressure and temperature signals output by the plug-in primary device 1 at the same moment in real time, the flow computer calculates the average flow velocity of the fluid in the cross section of the metering pipeline according to preset related parameters, a flow velocity-differential pressure signal delta P, a pressure signal P and a temperature signal T, and further calculates the flow of the fluid in the metering pipeline 3; the secondary instrument 2 may also be a flow totalizer or the like.
For convenience of processing, the differential pressure type flow velocity measuring head 12 is cylindrical and coaxial with the two variable measuring tubes 11; the full-pressure tapping hole 122 is arranged on the incident flow side of the differential pressure type flow velocity measuring head 12, and the axis of the full-pressure tapping hole 122 is perpendicular to and intersects with the axis of the differential pressure type flow velocity measuring head 12. The flow direction side of the differential pressure type flow velocity measurement head 12 refers to the side of the differential pressure type flow velocity measurement head 12 facing the incoming flow direction in the measurement duct 3.
When the device is applied, the two variable measuring tubes 11 and the differential pressure type flow velocity measuring head 12 are inserted into the measuring pipeline 3 perpendicular to the axis of the measuring pipeline 3, and the full pressure taking hole 122 points to the upstream direction of the fluid in the measuring pipeline 3;
it will be appreciated that the pressure type flow rate probe 12 may also have other shapes, such as an oval cylinder, and may be parallel to the axis of the two variable measurement tube 11.
As shown in fig. 3, two shrinkage guide grooves are formed on the outer peripheral surface of the differential pressure type flow velocity measurement head 12, a normal Fa at the center of the port of the full pressure taking hole 122 is perpendicularly intersected with the axis Y of the differential pressure type flow velocity measurement head 12, and the two shrinkage guide grooves are symmetrically arranged on two sides of a longitudinal plane formed by the normal Fa at the center of the port of the full pressure taking hole 122 and the axis Y of the differential pressure type flow velocity measurement head 12.
When the differential pressure type flow velocity measuring head 12 is inserted into the metering pipeline 3, the fluid flows in from the flow-facing end of the contraction guide groove and flows out from the back flow end of the contraction guide groove, so that the flow-facing end of the contraction guide groove forms an inlet end, and the back flow end of the contraction guide groove forms an outlet end.
Further, the contraction guide groove is sequentially divided into a contraction section 121 and a measurement section 124 along the flow direction of the fluid; the flow guiding cross-sectional area of the contraction section 121 is gradually reduced along the flow direction of the fluid, and the flow guiding cross-sectional area of the measurement section 124 is unchanged along the flow direction of the fluid; the static pressure tapping hole 123 is located in the measuring section 124.
As shown in fig. 6, the incident flow end of the measurement section 124 is connected to the back flow end of the contraction section 121, and the flow guide cross-sectional area of the measurement section 124 is the same as the maximum flow guide cross-sectional area of the contraction section 121.
In this embodiment, the contracting section 121 has a structure in which the effective sectional area S1 of the inlet end is larger than the effective sectional area S2 of the outlet end, so that the fluid flowing through the contracting section 121 is locally rectified and accelerated, thereby reducing the fluid turbulence received by the static pressure tapping hole 123 located at the contracting and guiding groove of the measuring section 124, and ensuring that the differential pressure type flow velocity measuring head 12 has higher sensitivity and stability when measuring the flow velocity of the low-flow velocity fluid.
The utility model discloses also can get the pressure hole 123 with the static pressure and set up the back flow end at differential pressure formula velocity of flow gauge head 12.
Further, the distance between the two constrictions 121 at the upstream end is smaller than the distance at the downstream end. This embodiment makes two shrink sections 121 great at the distance of exit end, conveniently arranges the static pressure and gets the pressure hole.
Preferably, the constriction 121 is wedge-shaped, as shown in fig. 3 and 5. As shown in fig. 7-8, the effective sectional area S1 at the inlet end is (La1+ Lb1) × H1/2 greater than the effective sectional area S2 at the outlet end is (La2+ Lb2) × H2/2, so that the flow guide section of the constriction section 121 is isosceles trapezoid, and the width and depth of the flow guide groove in the flow direction of the fluid are both reduced. It is understood that the contracting portion 121 may have other shapes, such as a tapered arc-shaped groove, as long as it is conformed that the effective sectional area of the inlet end is larger than that of the outlet end, i.e. it is conformed that the condition of S1 > S2 is satisfied, and the present invention is not limited thereto.
In order to further optimize the technical scheme, a normal Fb of the center of the port of the static pressure tapping hole 123 is perpendicular to a normal Fa of the center of the port of the full pressure tapping hole 122 and is coplanar with a central line of the contraction section 121 and a central line of the measurement section 124; a hydrostatic pressure tap 123 extends through both measuring sections 124 as shown in fig. 4 and 6. The static pressure tapping hole 123 and the full pressure tapping hole 122 are located in the same cross section position of the shrinkage guide groove formed on the differential pressure type flow velocity measuring head 12, and processing is facilitated. The axis of the static pressure tapping hole 123 and the axis of the full pressure tapping hole 122 may have other included angles, such as 80 degrees, and the axes of the two may also be located in the two cross sections of the differential pressure type flow rate measuring head 12, respectively.
In order to simplify the construction, the gap between the measuring tube bore and the two-variable measuring tube 11 forms a pressure conducting channel. In this embodiment, without separately providing a pressure guide channel, the fluid pressure in the measuring pipe 3 is measured through the flow meter insertion hole formed in the measuring pipe 3, the gap between the inserted sealing device 4 and the two-variable measuring pipe 11 inserted therein, so as to collect the fluid pressure at the pipe wall of the measuring pipe 3 and transmit the fluid pressure to the pressure transmitter 16.
For convenience of processing and manufacturing, the two-variable measuring tube 11 of the present application utilizes the cooperation of hollow tubes to realize pressure guiding effect, the two-variable measuring tube 11 includes an outer tube and an inner tube sleeved in the outer tube, the tube hole of the inner tube forms a full pressure guiding channel 112, a pipeline gap between the outer wall of the inner tube and the inner wall of the outer tube forms a static pressure guiding channel 113, and the temperature measuring head 151 is located in the static pressure guiding channel 113.
In this embodiment, only one inner tube is disposed in the inner space of the outer tube, and the total pressure and the static pressure measured by the differential pressure type flow velocity measuring head 12 are respectively transmitted to the differential pressure transmitter 14 through the cavity formed by the outer tube and the inner tube in a matching manner. Of course, the present application may also provide two inner tubes, which form the static pressure guide passage 113 and the full pressure guide passage 112.
Of course, in the present application, the through hole may be formed on the solid shaft to achieve the same purpose of forming the channel and accommodating the temperature measuring head 151, which is not described herein again.
In order to simplify the structure, the outer pipe and the inner pipe are both round pipes. The round pipe has a structure with a smooth cylindrical outer surface and a hollow inner part, so that the round pipe is convenient to process and is also convenient to be connected with the inserting sealing device 4 in a sealing way. It will be appreciated that the outer and inner tubes may be of other shapes, such as square, oval, etc.
As shown in fig. 2, the insertion sealing device 4 includes a fixing base 41 which is sealingly fixed to an outer wall of the metering pipe 3 at the meter insertion hole; a control valve 42 arranged at one end of the fixed base 41 far away from the metering pipeline 3, wherein when the two-variable measuring pipe 11 is inserted into the metering pipeline 3, the control valve 42 is opened; when the two-variable measuring pipe 11 is pulled out of the metering pipeline 3, the control valve 42 is closed; the sealing base 43 is arranged at one end of the control valve 42, which is far away from the fixed base 41, and the sealing base 43 can be used for the insertion of the two-variable measuring pipe 11 and the sealing fit with the two-variable measuring pipe 11; wherein, the pressure pipe of the pressure transmitter 16 is arranged at one end of the sealing base 43 far away from the flow meter insertion hole through the stop valve. The sealing base 43 is provided with a pressure transmitter interface; the pressure transmitter interface is connected to pressure transmitter 16 through a shut-off valve. Specifically, the bottom end of the fixed base 41 is welded on the outer wall of the metering pipeline 3, and the top end is connected with the control valve 42; the control valve 42 is embodied as a ball valve.
The sealing base 43 is used to ensure the sealing of the two-variable measuring tube 11 during the operation of inserting the measuring tube 3, the whole normal operation process after inserting the measuring tube 3 and the operation of pulling out the measuring tube 3, so that the fluid in the measuring tube 3 will not leak.
The control valve 42 is opened when the plug-in primary device 1 is plugged into the metering conduit 3; the control valve 42 is closed when the plug-in primary device 1 is removed, thus ensuring the sealing of the flow meter insertion hole when no measurement is carried out; of course, the flow meter insertion hole can be closed by the plug when the measurement is not carried out.
The insertion sealing device 4 of the present embodiment ensures operational reliability; alternatively, the plug-in sealing means 4 may be an O-ring, a flange or other structure that enables a sealing engagement of the hole with the pipe.
For convenience of assembly, a bivariate connecting seat 13 is arranged at the external end of the bivariate measuring tube 11, and a temperature sensor 15 and a differential pressure transmitter 14 are both arranged on the bivariate connecting seat 13; the two-variable connecting base 13 is provided with a first channel for communicating the full-pressure side input end of the differential pressure transmitter 14 with the full-pressure guide channel 112, a second channel for communicating the static-pressure side input end of the differential pressure transmitter 14 with the static-pressure guide channel 113, and a temperature sensor mounting hole for allowing the temperature measuring head 151 to pass through.
In this embodiment, the two-variable connecting base 13 is provided with a differential pressure output coplanar flange for mounting the differential pressure transmitter 14, a first channel and a second channel for guiding pressure are arranged inside the flange, and are respectively connected with a full pressure tapping hole 122 and a static pressure tapping hole 123 of the differential pressure type flow velocity measuring head 12, and the outside of the flange is connected with the three measuring valve groups and is connected with the differential pressure transmitter 14 through the three measuring valve groups.
The present embodiment employs a common industrial grade differential pressure transmitter 14 and pressure transmitter 16. During assembly, the temperature measuring head 151 of the temperature sensor 15 is inserted into the inner space of the two-variable measuring tube 11 through the temperature sensor mounting hole of the two-variable connecting base 13, and is inserted into the measuring pipeline 3 together with the two-variable measuring tube 11. After the temperature sensor 15 is installed on the two-variable connecting base 13, the terminal box shell with the temperature transmitter installed at the tail end of the temperature sensor 15 is still externally arranged on the two-variable connecting base 13.
Two variable survey buret 11 of this application install temperature sensor 15, differential pressure transmitter 14 through two variable connecting seat 13 to survey buret 11 with two variables and be integrated as an organic whole with temperature sensor 15, differential pressure transmitter 14, integrated level is higher, the fault rate is lower, the reliable operation.
It is understood that the present application can also realize the connection of the protruding end of the two-variable measuring tube 11 with the temperature sensor 15 and the differential pressure transmitter 14 through two components, respectively.
Specifically, the temperature sensor 15 is a sheathed temperature sensor. The temperature sensor 15 is a platinum resistance temperature sensor with PT100 or other specifications according to the requirement of a metering field. Except the pressure guide structure arranged inside, the outer pipe of the two-variable measuring pipe 11 also has the function of an armored platinum resistor temperature sensor sheath, and the armored platinum resistor temperature sensor can be reliably protected from being damaged by severe working conditions. Other types of temperature sensors 15 can be used according to the requirements of the application.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An insertion type differential pressure flowmeter is characterized by comprising an insertion type primary device (1) and a secondary instrument (2);
the plug-in primary device (1) comprises:
the device comprises a two-variable measuring tube (11) used for being inserted into a metering pipeline (3), wherein the insertion end of the two-variable measuring tube (11) is provided with a differential pressure type flow velocity measuring head (12), and the differential pressure type flow velocity measuring head (12) is provided with a static pressure tapping hole (123) and a full pressure tapping hole (122) which are used for measuring the differential pressure generated by the flow velocity of fluid;
the temperature sensor (15) and the differential pressure transmitter (14) are arranged at the external end of the two-variable measuring pipe (11), a static pressure guide channel (113) which is communicated with the static pressure taking hole (123) and the static pressure side input end of the differential pressure transmitter (14) and a full pressure guide channel (112) which is communicated with the full pressure taking hole (122) and the full pressure side input end of the differential pressure transmitter are arranged in the two-variable measuring pipe (11), and a temperature measuring head (151) of the temperature sensor (15) is inserted into the two-variable measuring pipe (11) at a position close to the differential pressure type flow velocity measuring head (12);
a pressure transmitter (16) for measuring the fluid pressure in the gap between the measuring opening in the measuring pipe (3) and the outer wall of the two-variable measuring pipe (11);
the insertion sealing device (4) is used for inserting/pulling out operation, fixing and sealing the two-variable measuring pipe (11) on the metering pipeline (3), and the insertion sealing device (4) is provided with a measuring pipe perforation for the two-variable measuring pipe (11) to pass through, and a pressure guide pipe for communicating a pressure guide pipe of the pressure transmitter (16) with the metering pipeline (3);
wherein, secondary instrument (2) with differential pressure transmitter (14), temperature sensor (15), pressure transmitter (16) all connect to can be according to differential pressure transmitter (14), temperature sensor (15), the data calculation that pressure transmitter (16) measured the flow of fluid in measurement pipeline (3).
2. The plug-in differential pressure flowmeter according to claim 1, wherein the differential flow rate probe (12) is cylindrical and coaxial with the two variable measurement tubes (11);
the full-pressure tapping hole (122) is arranged on the incident flow side of the differential pressure type flow velocity measuring head (12), and the axis of the full-pressure tapping hole (122) is perpendicular to and intersected with the axis of the differential pressure type flow velocity measuring head (12).
3. The plug-in differential pressure flowmeter according to claim 2, wherein the differential pressure type flow velocity measurement head (12) is provided with two contraction guide grooves on its outer peripheral surface, a normal (Fa) at the center of the port of the full pressure tapping hole (122) is perpendicularly intersected with the axis (Y) of the differential pressure type flow velocity measurement head (12), and the two contraction guide grooves are symmetrically arranged on both sides of a longitudinal plane formed by the normal (Fa) at the center of the port of the full pressure tapping hole (122) and the axis (Y) of the differential pressure type flow velocity measurement head (12).
4. The plug-in differential pressure flowmeter of claim 3, wherein the constricting draft channel is divided into a constricting section (121) and a measuring section (124) in sequence along the flow direction of the fluid;
wherein the flow guiding cross-sectional area of the contraction section (121) is gradually reduced along the flow direction of the fluid, and the flow guiding cross-sectional area of the measurement section (124) is constant along the flow direction of the fluid; the static pressure tapping hole (123) is positioned in the measuring section (124).
5. The plug-in differential pressure flowmeter of claim 4, wherein the distance of the two constrictions (121) at the inflow end is less than the distance at the outflow end.
6. The plug-in differential pressure flowmeter of claim 4, wherein the constriction (121) is wedge-shaped.
7. The plug-in differential pressure flowmeter of claim 4, wherein a normal (Fb) to a port center of the static pressure tap hole (123) and a normal (Fa) to a port center of the full pressure tap hole (122) are perpendicular and coplanar with a centerline of the constriction segment (121) and a centerline of the measurement segment (124);
the static pressure tapping hole (123) penetrates through the two measuring sections (124).
8. The plug-in differential pressure flow meter according to claim 1, characterized in that the gap between the measuring tube bore and the two-variable measuring tube (11) forms the pressure-conducting channel;
the two-variable measuring pipe (11) comprises an outer pipe and an inner pipe sleeved in the outer pipe, pipe holes of the inner pipe form a full-pressure guide channel (112), a pipeline gap between the outer wall of the inner pipe and the inner wall of the outer pipe forms a static pressure guide channel (113), and the temperature measuring head (151) is located in the static pressure guide channel (113).
9. The plug-in differential pressure flowmeter of claim 8, wherein the plug-in sealing device (4) comprises:
a fixed base (41) hermetically fixed on the outer wall of the metering pipeline (3) at the flow meter insertion hole;
a control valve (42) arranged at one end of the fixed base (41) far away from the metering pipeline (3), wherein the control valve (42) is opened when the two-variable measuring pipe (11) is inserted into the metering pipeline (3); the control valve (42) is closed when the two-variable measuring tube (11) is pulled out of the metering pipeline (3);
the sealing base (43) is arranged at one end, far away from the fixed base (41), of the control valve (42), and the sealing base (43) can be used for inserting the two-variable measuring pipe (11) and is in sealing fit with the two-variable measuring pipe (11);
wherein, the pressure pipe of the pressure transmitter (16) is arranged at one end of the sealing base (43) far away from the flow meter insertion hole through a stop valve.
10. Plug-in differential pressure flowmeter according to any of claims 1-9, characterized in that the external end of the two-variable measuring tube (11) is provided with a two-variable connecting socket (13), the temperature sensor (15) and the differential pressure transmitter (14) being both arranged on the two-variable connecting socket (13);
the two-variable connecting base (13) is provided with a first channel for communicating a full-pressure side input end of the differential pressure transmitter (14) with the full-pressure guide channel (112), a second channel for communicating a static-pressure side input end of the differential pressure transmitter (14) with the static-pressure guide channel (113), and a temperature sensor mounting hole for allowing the temperature measuring head (151) to penetrate through.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022176097.5U CN213021759U (en) | 2020-09-28 | 2020-09-28 | Plug-in differential pressure flowmeter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022176097.5U CN213021759U (en) | 2020-09-28 | 2020-09-28 | Plug-in differential pressure flowmeter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113483842A (en) * | 2021-06-02 | 2021-10-08 | 安徽春辉仪表线缆集团有限公司 | High-adaptability plate hole flowmeter and control system thereof |
| CN114001785A (en) * | 2021-11-30 | 2022-02-01 | 合肥科迈捷智能传感技术有限公司 | Pressure guiding structure of flowmeter and differential pressure type flowmeter |
| CN114199324A (en) * | 2022-01-10 | 2022-03-18 | 辽宁毕托巴科技股份有限公司 | Automatic sealing flow sensor |
| CN115420863A (en) * | 2022-11-04 | 2022-12-02 | 四川瑞吉绿能科技有限公司 | Method for improving measurement accuracy of gas carbon content |
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2020
- 2020-09-28 CN CN202022176097.5U patent/CN213021759U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113483842A (en) * | 2021-06-02 | 2021-10-08 | 安徽春辉仪表线缆集团有限公司 | High-adaptability plate hole flowmeter and control system thereof |
| CN113483842B (en) * | 2021-06-02 | 2024-06-11 | 安徽春辉仪表线缆集团有限公司 | High-adaptability plate hole flowmeter and control system thereof |
| CN114001785A (en) * | 2021-11-30 | 2022-02-01 | 合肥科迈捷智能传感技术有限公司 | Pressure guiding structure of flowmeter and differential pressure type flowmeter |
| CN114199324A (en) * | 2022-01-10 | 2022-03-18 | 辽宁毕托巴科技股份有限公司 | Automatic sealing flow sensor |
| CN114199324B (en) * | 2022-01-10 | 2024-05-24 | 毕托巴科技股份有限公司 | Automatic sealing flow sensor |
| CN115420863A (en) * | 2022-11-04 | 2022-12-02 | 四川瑞吉绿能科技有限公司 | Method for improving measurement accuracy of gas carbon content |
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