阅读说明：本技术 一种用于限流试验的喉经可调式文丘里管 (Throat-adjustable Venturi tube for current limiting test ) 是由 庞飞 桂璐廷 王费 谈文姬 庞程 艾明 刘丽敏 陈丽 于 2020-06-17 设计创作，主要内容包括：本发明公开了一种用于限流试验的喉经可调式文丘里管,包括流体管,内壁设有环形凹槽,环凹形槽内嵌套有与环凹形槽配合的套环,环形凹槽与套环之间夹持有空腔环,空腔环的截面尺寸大于环凹形槽的截面尺寸,在流体管的管壁上、套环的环壁上和空腔环的环壁上设有位置相对应的第一径向通孔和第二径向通孔,第一径向通孔只穿过空腔环一侧的环壁,第二径向通孔穿过空腔环两侧的环壁,在第一径向通孔与第二径向通孔内设有第一套管和第二套管,其中第二套管为的外壁设有刻度或连接有位移传感器,且第二套管与空腔环的环壁之间的连接端为密封连接,第一套管、第二套管在与流体管管壁之间设有密封塞。该文丘里管具有结构简单,测量便捷,随时方便地调节管体内文丘里管的喉管尺寸。(The invention discloses a throat adjustable Venturi tube for a current limiting test, which comprises a fluid pipe, wherein the inner wall of the fluid pipe is provided with an annular groove, a lantern ring matched with the annular groove is nested in the annular groove, a cavity ring is clamped between the annular groove and the lantern ring, the section size of the cavity ring is larger than that of the annular groove, a first radial through hole and a second radial through hole which are corresponding in position are arranged on the pipe wall of the fluid pipe, the ring wall of the lantern ring and the ring wall of the cavity ring, the first radial through hole only penetrates through the ring wall on one side of the cavity ring, the second radial through hole penetrates through the ring walls on two sides of the cavity ring, a first sleeve and a second sleeve are arranged in the first radial through hole and the second radial through hole, wherein the outer wall that the second sleeve pipe is equipped with the scale or is connected with displacement sensor, and the link between the rampart of second sleeve pipe and cavity ring is sealing connection, and first sleeve pipe, second sleeve pipe are equipped with the sealing plug between with the fluid pipe wall. The Venturi tube has the advantages of simple structure, convenient measurement and convenient adjustment of the size of the throat of the Venturi tube in the tube body at any time.)

1. A throat-adjustable Venturi tube for current-limiting test is characterized in that the Venturi tube comprises a fluid tube, an annular groove is formed in the inner wall of the fluid tube, a lantern ring matched with the annular groove is nested in the annular groove, a life-saving ring type cavity ring is clamped between the annular groove and the lantern ring, the cross-sectional dimension of the cavity ring is larger than that of the annular groove, a first radial through hole and a second radial through hole which correspond to each other in position are respectively formed in the tube wall of the fluid tube, the ring wall of the lantern ring and the ring wall of the cavity ring, the first radial through hole only penetrates through the ring wall on one side of the cavity ring, the second radial through hole respectively penetrates through the ring walls on two sides of the cavity ring, a first sleeve and a second sleeve are respectively arranged in the first radial through hole and the second radial through hole, and the outer wall of the second sleeve at least arranged in the second radial through hole is provided with scales or connected with a displacement sensor, and the connecting end between the second sleeve and the annular wall of the cavity ring is in sealing connection, and the connecting ends between the first sleeve and the fluid pipe wall and between the first sleeve and the second sleeve are provided with sealing plugs.

2. The venturi tube with adjustable throat diameter for the current limiting test of claim 1, wherein the cavity ring is a nylon cavity ring, a waterproof coating is attached to the inner wall of the nylon cavity ring, and an annular support with a trapezoidal cross section is further disposed on the inner wall of the nylon cavity ring.

3. The venturi tube with adjustable throat diameter for the current limiting test of claim 2, wherein the cavity ring is a rubber ring, and an annular support with a trapezoidal cross section is further provided on the inner wall of the rubber ring.

4. The adjustable throat-diameter venturi tube for the current-limiting test according to claim 3, wherein the wall thickness of the cavity ring is gradually reduced from the thickness to the middle of the inner wall of the cavity ring by being clamped between the annular groove and the lantern ring.

5. The venturi tube with adjustable throat diameter for the current limiting test according to claim 2 or 4, wherein a plurality of annular grooves are arranged on the inner wall of the fluid tube, a lantern ring matched with the annular grooves is nested in each annular groove, and a life-saving ring type cavity ring is clamped between each annular groove and each lantern ring.

6. The venturi tube with adjustable throat diameter for use in the flow restriction test as claimed in claim 2 or 4, wherein a plurality of closely arranged collars each having a cavity ring clamped thereon are provided in the same annular recess.

7. The venturi tube with adjustable throat diameter for the flow restriction test according to claim 2 or 4, wherein the cross section of the collar is U-shaped, or rectangular, or trapezoidal.

8. The adjustable throat-diameter venturi tube for flow restriction test according to claim 1, wherein the fluid pipe is a steel pipe or a plastic pipe.

9. The adjustable throat venturi according to claim 8, wherein the fluid tube is made by nesting and assembling an outer tube and an inner tube, wherein the inner tube is divided into several segments, and annular groove gaps are formed among the several segments of the inner tube.

10. The adjustable throat-diameter venturi according to claim 9, wherein the outer tube of the fluid tube is a steel tube and the inner tube is a plastic tube.

Technical Field

The invention relates to the technical field of Venturi tube structures, in particular to a throat-adjustable Venturi tube for a current limiting test.

Background

For the flow measurement of liquid and gas, a sensor is arranged on a pipeline through which a fluid flows, an electric signal is measured by the sensor, the pressure difference of the fluid in the pipeline can be reflected by the electric signal, the flow velocity of the fluid can be calculated through the pressure difference, the flow can be obtained according to the density rho and the flow velocity v of the fluid and the relation between the cross section A and the flow Q, namely Q is rho × v × A, the pressure difference delta p which can be sensed is between delta pmin and delta pmax due to the limitation of the measuring range of the sensor, and the range ratio of the flow is the same measuring pipeline

Is equal to

In an actual use scene, the range ratio of some flow processes is very large, a single conventional flowmeter cannot meet the requirement of full-range measurement, a plurality of flow measuring devices are generally connected in parallel in the prior art, the full-range measurement is carried out in a valve switching or combining mode to measure the flow in different processes, different valve combinations need to be switched according to different flow states, on one hand, the measurement process is complicated, the control program is complex, and more execution elements are required to be matched to complete the switching of the measurement devices; on the other hand, the measurement cost is increased by several times; finally, a plurality of measuring devices need larger installation space, higher requirements are put forward for applicable environment, and correspondingly, the installation, maintenance and overhaul costs are greatly increased.

Chinese patent CN 110987094 a discloses a rigid variable cross-section device, comprising: the detection pipeline is used for allowing the fluid to be detected to pass through and is made of a rigid material; a driving member for providing a driving force to the actuating member; the actuating component is connected with the power output end of the driving component in a transmission way, is arranged on the inner wall of the detection pipeline, comprises at least one deformation unit which can act under the action of driving force so as to change the gap between the actuating component and the installation wall surface, and changes the cross-sectional area inside the detection pipeline through the deformation unit. The problems of complex detection pipelines, high cost, large installation space and the like in the prior art are solved, the cross section of the detection pipeline is changed on line to widen the range ratio, the cost is greatly reduced, the installation space is reduced, the realizability of changing the section of the rigid detection pipeline is provided, and the device is flexible and reliable in action, high in sensitivity and easy to operate. However, the above-mentioned detection device is still relatively complex in structure and still not simple and convenient enough in operation.

The CAP1400 nuclear power technology of the large-scale advanced pressurized water reactor nuclear power station is a third-generation passive nuclear power technology which is innovatively developed on the basis of the API000 of the world three-generation advanced nuclear power technology of digestion and absorption, has independent intellectual property rights, higher safety and better economy and reaches the international leading level. The chemical and volume control system is one of the most important auxiliary systems of the nuclear power plant, and has important functions of controlling the slow reactivity change of a reactor core, controlling the primary loop water charge, purifying the primary loop water quality, controlling the primary loop water chemistry condition and the like. The CAP1400 nuclear power plant chemical-capacitance system is provided with a flow-limiting venturi on a main pipe at the outlet of a make-up pump, and is mainly used for preventing the make-up pump of the chemical-capacitance system from running at an excessive flow rate, avoiding cavitation at the inlet of the make-up pump and limiting the maximum dilution flow rate; the equipment is important equipment for ensuring the normal and stable operation of the water replenishing pump and meeting the volume control requirement of a main system.

At present, as shown in fig. 7, for a current-limiting venturi tube for nuclear power, the flow of liquid flowing through the throat diameter of the venturi tube cannot exceed a set flow value under the conditions of set pressure and temperature for each specification of the current-limiting venturi tube. Therefore, the numerical value of the throat diameter needs to be determined through repeated tests, in the prior art, the test pieces with different throat diameter sizes can only be processed for multiple times to be respectively subjected to repeated tests, and the number of the test pieces required to be manufactured is large, so that the throat diameter size of the test piece is gradually close to the final required size. If the current-limiting Venturi tubes with various specifications are needed, the number of test pieces to be manufactured is large, huge manpower and material resources are wasted, and a large amount of time is consumed.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides the throat adjustable venturi tube for the flow limiting test, which has a simple structure, is convenient and quick to measure, and can conveniently adjust the size of the throat of the venturi tube in the tube body at any time according to the actual requirements of flow limiting, temperature and pressure at the throat diameter part of the venturi tube.

In order to achieve the above object, the technical solution of the present invention is to provide a venturi tube with adjustable throat diameter for a current limiting test, the venturi tube includes a fluid tube, an annular groove is disposed on an inner wall of the fluid tube, a lantern ring fitted with the annular groove is nested in the annular groove, a life-saving ring type cavity ring is clamped between the annular groove and the lantern ring, a cross-sectional dimension of the cavity ring is larger than a cross-sectional dimension of the annular groove, a first radial through hole and a second radial through hole corresponding to each other in position are respectively disposed on a tube wall of the fluid tube, an annular wall of the lantern ring and an annular wall of the cavity ring, the first radial through hole only penetrates through the annular wall on one side of the cavity ring, the second radial through hole respectively penetrates through the annular walls on both sides of the cavity ring, a first sleeve and a second sleeve are respectively disposed in the first radial through hole and the second radial through hole, wherein an outer wall of the second sleeve at least disposed in the second radial through hole is provided, and the connecting end between the second sleeve and the annular wall of the cavity ring is in sealing connection, and the connecting ends between the first sleeve and the fluid pipe wall and between the first sleeve and the second sleeve are provided with sealing plugs.

In order to enable the cavity ring to have certain strength and bear certain air pressure or hydraulic pressure and simultaneously ensure that the cavity ring does not leak after being inflated or filled with liquid, the preferred technical scheme is that the cavity ring is a nylon cavity ring, a waterproof coating is attached to the inner wall of the nylon cavity ring, and an annular support with a trapezoidal section is further arranged on the inner wall of the nylon cavity ring.

In order to enable the cavity ring to have certain strength, bear certain air pressure or hydraulic pressure, ensure that the cavity ring does not leak after being inflated or filled with liquid and adjust the sectional dimension of the throat pipe, the preferred technical scheme is that the cavity ring is a rubber ring, and an annular support with a trapezoidal section is further arranged on the inner wall of the rubber ring.

In order to enable the cavity ring to have certain strength and bear certain air pressure or hydraulic pressure, ensure that the cavity ring does not leak after being inflated or filled with liquid and adjust the section size of the throat pipe, the further preferable technical scheme is that the wall thickness of the cavity ring is gradually reduced from the thickness to the middle part of the inner wall of the cavity ring by clamping between the annular groove and the lantern ring.

In order to facilitate the measurement of parameters such as flow rate, pressure and the like of fluid in different parts of the fluid pipe, a further preferred technical scheme is that a plurality of annular grooves are arranged on the inner wall of the fluid pipe, a lantern ring matched with the annular groove is nested in each annular groove, and a life-saving ring type cavity ring is clamped between each annular groove and each lantern ring.

In order to adjust the axial structure or the axial size of the throat part in the fluid pipeline conveniently, a further preferable technical scheme is that a plurality of closely arranged lantern rings are arranged in the same annular groove, and a cavity ring is clamped on each lantern ring.

In order to adjust the axial structure or the axial size of the throat part in the fluid pipeline conveniently, a further preferable technical scheme is that the cross section of the lantern ring is U-shaped, rectangular or trapezoidal.

In order to be suitable for measuring parameters such as flow, pressure and the like in different fluid pipes, in order to conveniently adjust the axial structure or the axial size of the throat part in the fluid pipe, a further preferable technical scheme is that the fluid pipe is a steel pipe or a plastic pipe.

In order to facilitate the processing, manufacturing, mounting and debugging of the throat adjustable venturi tube for the flow limiting test, the further preferred technical scheme is that the fluid tube is formed by nesting type assembly of an outer tube and an inner tube, wherein the inner tube is divided into a plurality of sections, and annular groove gaps are formed among the sections of the inner tube.

In order to facilitate the processing, manufacturing, installing and debugging of the throat adjustable venturi tube for the flow limiting test, a further preferred technical scheme is that an outer tube in the fluid tube is a steel tube, and an inner tube is a plastic tube.

The venturi tube for the flow limiting test has the advantages and beneficial effects that the venturi tube for the flow limiting test has the characteristics of simple structure, convenience and quickness in measurement, capability of conveniently adjusting the size of the throat tube of the venturi tube in the tube body at any time according to the actual requirements of measuring the flow and the pressure in the tube body, and the like. The adjustable venturi tube for the flow limiting test can fill gas or liquid into the cavity ring through the life ring type cavity ring additionally held between the annular groove and the lantern ring on the inner wall of the fluid tube and the first sleeve communicated into the cavity ring, so that the cavity ring is expanded, and the expanded cavity ring forms a throat tube structure in the venturi tube in the fluid tube. And then the fluid management device can be connected with a flow measurer through the first sleeve penetrating through the pipe wall of the pipe body and penetrating through the two side walls of the cavity ring through the sleeve ring, so that various parameters of fluid management can be measured. After the measurement is finished, the measurer is withdrawn, and the gas or liquid in the cavity ring is emptied, so that the original state of the tank body can be recovered. A plurality of cavity ring structures can be arranged at a plurality of positions in the fluid pipe, each cavity ring can be made into different sizes, and the cavity rings can be made into elastic bodies, so that the effect of adjusting the area of the throat pipe section is achieved. The structure is used for the flow-limiting experiment of the throat diameter part of the Venturi tube, so that the manufacturing of the experimental pipe fitting can be greatly saved, and a large amount of manpower, material resources and test time can be saved.

Drawings

FIG. 1 is one of the schematic diagrams of the throat adjustable venturi tube to be measured for flow limiting test according to the present invention;

FIG. 2 is a schematic view of the measurement state of the venturi tube with adjustable throat diameter for the flow-limiting test according to the present invention;

FIG. 3 is a second diagram of the measured state of the adjustable venturi tube for flow restriction test according to the present invention;

FIG. 4 is a second schematic view of the measurement status of the adjustable venturi tube for flow restriction test according to the present invention;

FIG. 5 is a third schematic diagram of the measured state of the adjustable venturi tube for flow-limiting test according to the present invention;

FIG. 6 is a third schematic view showing the measurement state of the adjustable venturi tube for flow restriction test according to the present invention;

FIG. 7 is a current-limiting venturi for nuclear power.

1. A fluid pipe; 1.1, an outer tube; 1.2, an inner tube; 2. an annular groove; 3. a collar; 4. a cavity ring; 4.1, a ring-shaped bracket; 5. a first radial through hole; 6. a second radial through hole; 7. a first sleeve; 8. a second sleeve; 9. a sealing plug;

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in figures 1 and 2, the invention is a throat adjustable venturi tube for a current limiting test, the venturi tube comprises a fluid tube 1, the inner wall of the fluid tube 1 is provided with an annular groove 2, a lantern ring 3 matched with the annular groove 2 is nested in the annular groove 2, a life-saving ring type cavity ring 4 is clamped between the annular groove 2 and the lantern ring 3, the cross-sectional dimension of the cavity ring 4 is larger than that of the annular groove 2, a first radial through hole 5 and a second radial through hole 6 which are corresponding in position are respectively arranged on the tube wall of the fluid tube 1, the annular wall of the lantern ring 3 and the annular wall of the cavity ring 4, the first radial through hole 5 only penetrates through the annular wall on one side of the cavity ring 4, the second radial through hole 6 respectively penetrates through the annular walls on two sides of the cavity ring 4, a first sleeve tube 7 and a second sleeve 8 are respectively arranged in the first radial through hole 5 and the second radial through hole 6, wherein the outer wall of the second sleeve 8 at least arranged in the second radial through hole 6 is provided with scales or connected with a displacement sensor, the connecting end between the second sleeve 8 and the annular wall of the cavity ring 4 is in sealing connection, the connecting ends between the first sleeve 7 and the second sleeve 8 and the pipe wall of the fluid pipe 1 are provided with sealing plugs 9, and the sealing plugs 9 are used for preventing fluid leakage.

In order to enable the cavity ring 4 to have certain strength and bear certain air pressure or hydraulic pressure, ensure that the cavity ring 4 does not leak after being inflated or filled with liquid and ensure that the section of the throat diameter part of the Venturi tube is cylindrical, the preferred embodiment of the invention is that the cavity ring 4 is a nylon cavity ring, a waterproof coating is attached to the inner wall of the nylon cavity ring, and the inner wall of the nylon cavity ring is also provided with an annular support 4.1 with a trapezoidal section.

In order to enable the cavity ring 4 to have certain strength, bear certain air pressure or hydraulic pressure, ensure that the cavity ring does not leak after being inflated or filled with liquid, adjust the sectional dimension of the throat pipe and ensure that the section of the throat diameter part of the Venturi pipe is cylindrical, the preferred embodiment of the invention also comprises that the cavity ring 4 is a rubber ring, and the inner wall of the rubber ring is also provided with an annular bracket 4.1 with a trapezoidal section.

In order to make the cavity ring 4 have certain strength, can bear certain air pressure or hydraulic pressure, ensure the cavity ring will not leak after inflating or filling liquid, and can also adjust the cross-sectional dimension of the throat, the further preferred embodiment of the invention is that the wall thickness of the cavity ring 4 is gradually reduced from the thickness of the clamping section between the annular groove 2 and the lantern ring 3 to the middle part of the inner wall of the cavity ring 4, thus facilitating the adjustment of the cross-sectional dimension of the throat.

As shown in fig. 3 and 4, in order to measure parameters such as flow rate, pressure and the like of fluid in the fluid pipe 1 at different positions, the invention further discloses a preferred embodiment that a plurality of annular grooves 2 are arranged on the inner wall of the fluid pipe 1, a lantern ring 3 matched with the annular grooves 2 is nested in each annular groove 2, and a life ring type cavity ring 4 is clamped between each annular groove 2 and each lantern ring 3.

In order to facilitate adjustment of the axial configuration or axial dimension of the throat region in the fluid conduit 1, as shown in fig. 5 and 6, a further preferred embodiment of the present invention is that a plurality of closely spaced collars 3 are disposed in the same annular recess 2, and a cavity ring 4 is held on each collar 3.

In order to adjust the axial structure or the axial dimension of the throat part in the fluid pipe 4, the cross section of the lantern ring 3 is U-shaped, rectangular or trapezoidal in a further preferred embodiment of the invention.

In order to be suitable for measuring parameters such as flow rate and pressure in different fluid pipes 1, and in order to adjust the axial structure or the axial dimension of the throat part in the fluid pipe 4 conveniently, the fluid pipe 1 is a steel pipe or a plastic pipe.

In order to facilitate the processing, manufacturing, mounting and debugging of the throat adjustable venturi tube for the flow limiting test, the fluid tube 1 is further preferably manufactured by nesting and assembling an outer tube 1.1 and an inner tube 1.2, wherein the inner tube 1.2 is divided into a plurality of sections, and gaps forming an annular groove 2 are arranged among the sections of the inner tube 1.2.

In order to facilitate the processing, manufacturing, mounting and debugging of the throat adjustable venturi tube for the flow limiting test, a further preferred embodiment of the invention is that the outer tube 1.1 in the fluid tube 11 is a steel tube, and the inner tube 1.2 is a plastic tube.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the technical principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.