CN111750939A - A Throat Meridian Adjustable Venturi Tube for Current Limiting Test - Google Patents

Abstract

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.

Description

A Throat Meridian Adjustable Venturi for Current Limiting Test

technical field

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

Background technique

等于

For the flow measurement of liquid and gas, the sensor is installed on the pipeline through which the fluid flows, and the electrical signal is measured by the sensor. The electrical signal can reflect the pressure difference of the fluid inside the pipeline, and the flow rate of the fluid can be calculated through the pressure difference. The relationship between the density ρ, the flow velocity v and the cross section A and the flow rate Q is: Q=ρ×v×A can obtain the flow rate; due to the limitation of the measurement range of the sensor, the pressure difference Δp that can be sensed is between Δpmin and Δpmax. The same measuring pipe, the flow turndown ratio

equal

In actual use scenarios, the range ratio of some flow processes is very large, and a single conventional flowmeter cannot meet the requirements of full-scale measurement. In the prior art, multiple flow measurement devices are usually connected in parallel, and the full-scale measurement is performed by valve switching or combination. The measurement measures the flow of different processes. This method needs to switch different valve combinations for different flow states. On the one hand, the measurement process is cumbersome, the control program is complicated, and more actuators are needed to complete the switching of the measurement device; On the other hand, the measurement cost is increased several times; finally, multiple measurement devices require a larger installation space, which puts forward higher requirements for the applicable environment, and accordingly greatly increases the installation, maintenance and repair costs.

Chinese patent CN 110987094 A discloses a rigid variable section device, comprising: a detection pipe, used for the passage of the fluid to be tested, made of rigid material; a driving part, used for providing driving force for the execution part; the execution part, The utility model is connected to the power output end of the driving component in a transmission manner, and is installed on the inner wall of the detection pipe, and includes at least one deformation unit that can act under the action of the driving force to change the gap between the execution component and the installation wall. The deformation unit makes the interior of the detection pipe changes in cross-sectional area. It solves the problems of complex detection pipeline, high cost and large installation space in the prior art. By changing the cross section of the detection pipeline online to widen the range ratio, the cost is greatly reduced and the installation space is reduced, which provides the feasibility of changing the section of the rigid detection pipeline. , and flexible and reliable action, high sensitivity, easy to operate. However, the structure of the above detection device is still relatively complicated, and the operation is still not simple enough.

Large-scale advanced pressurized water reactor nuclear power plant CAP1400 nuclear power technology is the third generation with independent intellectual property rights, higher safety, and better economy, which has reached the international leading level. Passive nuclear power technology. The chemical and volume control system is one of the most important auxiliary systems in nuclear power plants. It has important functions such as controlling the slow reactivity change of the core, controlling the amount of water in the primary circuit, purifying the water quality of the primary circuit, and controlling the chemical conditions of the primary water. In CAP1400 nuclear power plant chemical capacity system, a current limiting venturi is set on the outlet main pipe of the make-up pump, which is mainly used to prevent the make-up pump from over-flow operation of the chemical capacity system, avoid cavitation at the inlet of the make-up pump and limit the maximum dilution flow; this equipment is to ensure the make-up pump It is an important equipment that operates normally and stably and meets the volume control requirements of the main system.

At present, the current-limiting Venturi used in nuclear power is shown in Figure 7. Each specification of the current-limiting Venturi needs to realize that under the set pressure and temperature conditions, the liquid flow through the throat of the Venturi can not exceed the set flow value. . Therefore, it is necessary to determine the value of the throat diameter through repeated tests. The existing technology can only process test pieces of different throat diameters for repeated tests respectively. In this way, the number of test pieces to be made will be large, so that the The throat size gradually approaches the final desired size. If multiple specifications of current-limiting Venturi tubes are required, the number of test pieces to be made will be large, which will waste a huge amount of manpower and material resources, and consume a lot of time.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the defects existing in the prior art, and to provide a simple structure and convenient measurement, which can conveniently adjust the Venturi in the pipe body at any time according to the actual needs of the restricted flow, temperature and pressure at the throat of the Venturi pipe. Throat size of the pipe Adjustable Venturi throat for flow-restriction testing.

In order to achieve the above-mentioned purpose, the technical scheme of the present invention is to provide a throat channel adjustable venturi tube for flow limiting test, the venturi tube includes a fluid tube, and the inner wall of the fluid tube is provided with an annular groove, and the annular groove A collar matched with the annular concave groove is nested in the groove, and a lifebuoy-type cavity ring is clamped between the annular groove and the collar. The cross-sectional dimension of the cavity ring is larger than that of the annular concave groove. A first radial through hole and a second radial through hole corresponding to positions are respectively provided on the pipe wall of the fluid pipe, the annular wall of the collar and the annular wall of the cavity ring, and the first radial through hole only penetrates Passing through the ring wall on one side of the cavity ring, the second radial through holes respectively pass through the ring walls on both sides of the cavity ring, and a first sleeve is respectively provided in the first radial through hole and the second radial through hole and a second sleeve, wherein at least the outer wall of the second sleeve arranged in the second radial through hole is provided with a scale or is connected with a displacement sensor, and the connection end between the second sleeve and the ring wall of the cavity ring For sealing connection, sealing plugs are provided on the connecting ends of the first sleeve and the second sleeve with the fluid pipe wall.

In order to make the cavity ring have a certain strength, be able to withstand a certain air pressure or hydraulic pressure, and at the same time ensure that the cavity ring will not leak after being inflated or filled with liquid, the preferred technical solution 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 bracket with a trapezoidal cross-section is also arranged on the inner wall of the nylon cavity ring.

In order to make the cavity ring have a certain strength, can withstand a certain air pressure or hydraulic pressure, and at the same time ensure that the cavity ring will not leak after being inflated or filled with liquid, and can also adjust the cross-sectional size of the throat, the preferred technical solution is The cavity ring is a rubber ring, and the inner wall of the rubber ring is also provided with an annular bracket with a trapezoidal cross-section.

In order to make the cavity ring have a certain strength, be able to withstand a certain air pressure or hydraulic pressure, and at the same time ensure that the cavity ring will not leak after being inflated or filled with liquid, and can also adjust the cross-sectional size of the throat, a further preferred technical solution is Yes, the wall thickness of the cavity ring gradually becomes thinner from the thickness to the middle of the inner wall of the cavity ring between the annular groove and the collar.

In order to facilitate the measurement of parameters such as the flow rate and pressure of the fluid in the fluid pipe at different parts of the fluid pipe, a further preferred technical solution is that a plurality of annular grooves are arranged on the inner wall of the fluid pipe, and each annular concave groove A collar matched with an annular concave groove is nested inside, and a lifebuoy-type cavity ring is clamped between each annular groove and each collar.

In order to facilitate the adjustment of the axial structure or axial size of the throat portion in the fluid pipeline, a further preferred technical solution is that a plurality of closely arranged collars are arranged in the same annular groove, and each collar is provided with a plurality of closely arranged collars. Cavity rings are clamped on both.

In order to facilitate adjustment of the axial structure or axial dimension of the throat portion in the fluid pipeline, a further preferred technical solution is that the cross-section of the collar is U-shaped, or rectangular, or trapezoidal.

In order to be suitable for the measurement of parameters such as flow and pressure inside different fluid pipes, in order to facilitate the adjustment of the axial structure or axial size of the throat portion of the fluid pipe, a further preferred technical solution is that the fluid pipe is a steel pipe, or a plastic pipe.

In order to facilitate the processing, manufacture, installation and debugging of the adjustable throat venturi tube used for the current limiting test, a further preferred technical solution is that the fluid tube is made by nested assembly of the outer tube and the inner tube, wherein The inner tube is divided into several sections, and a ring-shaped groove gap is arranged between the several sections of the inner tube.

In order to facilitate the processing, manufacture, installation, and debugging of the adjustable venturi tube for the flow-limiting test, a further preferred technical solution is that the outer tube in the fluid tube is a steel tube, and the inner tube is a plastic tube.

The advantages and beneficial effects of the present invention lie in that the throat channel-adjustable Venturi tube used for the current limiting test has a simple structure and convenient measurement, and can conveniently adjust the Venturi in the tube body at any time according to the actual needs of measuring the flow and pressure in the tube body. The size of the throat of the pipe, etc. The throat channel adjustable venturi tube used for the current limiting test passes through the lifebuoy-type cavity ring supported between the annular groove on the inner wall of the fluid tube and the collar, and the first sleeve leading into the cavity ring, Gas or liquid can be filled into the cavity ring, so that the cavity ring is inflated, and the inflated cavity ring forms the throat structure in the Venturi tube in the fluid pipe. It can then be connected to a flow measuring device through a first sleeve passing through the wall of the tube body, through the collar, and through both side walls of the cavity ring, so that various parameters of fluid management can be measured. After the measurement is completed, the measuring device can be withdrawn, and the gas or liquid in the cavity ring can be emptied, and the tank can be restored to its original state. Multiple cavity ring structures can be arranged at multiple positions in the fluid pipe, each cavity ring can be made into different sizes, and the cavity ring can be made into an elastic body, so as to achieve the effect of adjusting the area of the throat section. This structure is used for the current-limiting experiment at the throat of the venturi tube, which can greatly save the production of experimental pipe fittings, and can save a lot of manpower, material resources and test time.

Description of drawings

Fig. 1 is one of the state schematic diagrams to be measured of the adjustable Venturi tube of the present invention for the current limiting test;

Fig. 2 is one of the schematic diagrams of the measurement state of the adjustable venturi tube of the present invention for the current limiting test;

Fig. 3 is the second schematic diagram of the state to be measured of the adjustable venturi tube of the present invention for the current limiting test;

Fig. 4 is the second schematic diagram of the measurement state of the adjustable venturi tube of the present invention for the current limiting test;

Fig. 5 is the third schematic diagram of the state to be measured of the adjustable venturi tube of the present invention for the current limiting test;

Fig. 6 is the third schematic diagram of the measurement state of the adjustable venturi tube of the present invention for the current limiting test;

Figure 7 is the current limiting Venturi for nuclear power.

1. Fluid tube; 1.1, outer tube; 1.2, inner tube; 2, annular groove; 3, collar; 4, cavity ring; 4.1, annular bracket; 5, first radial through hole; 6, second radial through hole; 7. the first sleeve; 8. the second sleeve; 9. the sealing plug;

Detailed ways

The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and embodiments. The following examples are only used to more clearly illustrate the technical solutions of the present invention, and cannot be used to limit the protection scope of the present invention.

As shown in Figures 1 and 2, the present invention is a throat-adjustable venturi tube for flow-limiting test. The venturi tube includes a fluid tube 1, and the inner wall of the fluid tube 1 is provided with an annular groove 2. The concave groove 2 is nested with a collar 3 which is matched with the annular concave groove 2. A lifebuoy-type cavity ring 4 is clamped between the annular groove 2 and the collar 3. The cross-sectional size of the cavity ring 4 is larger than that of the ring. The cross-sectional dimension of the concave groove 2 is provided with a first radial through hole 5 and a second radial through hole corresponding to the position on the pipe wall of the fluid pipe 1, the ring wall of the collar 3 and the ring wall of the cavity ring 4, respectively. Radial through holes 6, the first radial through holes 5 only pass through the ring wall on one side of the cavity ring 4, and the second radial through holes 6 pass through the ring walls on both sides of the cavity ring 4 respectively. A first sleeve 7 and a second sleeve 8 are respectively provided in the through hole 5 and the second radial through hole 6, wherein at least the outer wall of the second sleeve 8 arranged in the second radial through hole 6 is provided with A displacement sensor is scaled or connected, and the connection end between the second sleeve 8 and the ring wall of the cavity ring 4 is a sealed connection, and the first sleeve 7 and the second sleeve 8 are between the wall of the fluid pipe 1 There is a sealing plug 9 on the connecting end of the fuselage, and the sealing plug 9 is used to prevent the leakage of the fluid.

In order to make the cavity ring 4 have a certain strength, it can withstand a certain air pressure or hydraulic pressure, and at the same time to ensure that the cavity ring 4 will not leak after being inflated or filled with liquid, and at the same time to ensure that the cross-sectional shape of the throat of the venturi tube is cylindrical. The preferred embodiment of the present 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 ring with a trapezoidal cross-section. Bracket 4.1.

In order to make the cavity ring 4 have a certain strength, it can withstand a certain air pressure or hydraulic pressure, and at the same time ensure that the cavity ring will not leak after being inflated or filled with liquid, and the cross-sectional size of the throat can also be adjusted. The cross-sectional shape of the pipe throat diameter portion is cylindrical. In a preferred embodiment of the present invention, the cavity ring 4 is a rubber ring, and the inner wall of the rubber ring is also provided with an annular support 4.1 with a trapezoidal cross-section.

In order to make the cavity ring 4 have a certain strength, be able to withstand a certain air pressure or hydraulic pressure, and at the same time ensure that the cavity ring will not leak after being inflated or filled with liquid, and can also adjust the cross-sectional size of the throat, the present invention is further preferred. In addition, the wall thickness of the cavity ring 4 gradually becomes thinner from the clamping section between the annular groove 2 and the collar 3 to the middle of the inner wall of the cavity ring 4, so as to facilitate the adjustment of the cross-sectional size of the throat. adjust.

As shown in FIGS. 3 and 4 , in order to facilitate the measurement of parameters such as the flow rate and pressure of the fluid in the fluid pipe 1 at different parts of the pipe, a further preferred embodiment of the present invention is that the inner wall of the fluid pipe 1 is provided with A plurality of annular grooves 2, each annular concave groove 2 is nested with a collar 3 that cooperates with the annular concave groove 2, and a lifebuoy is clamped between each annular groove 2 and each collar 3 Type of cavity ring 4.

As shown in FIGS. 5 and 6 , in order to facilitate the adjustment of the axial structure or the axial dimension of the throat portion in the fluid pipe 1, a further preferred embodiment of the present invention is that the same annular groove 2 is provided with multiple There are a number of closely arranged collars 3 , and a cavity ring 4 is clamped on each collar 3 .

In order to facilitate adjustment of the axial structure or axial dimension of the throat portion in the fluid pipe 4, a further preferred embodiment of the present invention is that the cross-section of the collar 3 is U-shaped, or rectangular, or trapezoidal.

In order to be applicable to the measurement of parameters such as flow rate and pressure inside different fluid pipes 1, in order to facilitate adjustment of the axial structure or axial dimension of the throat portion in the fluid pipe 4, a further preferred embodiment of the present invention is that the fluid pipe 1 For steel pipes, or for plastic pipes.

In order to facilitate the processing, fabrication, installation and debugging of the adjustable throat venturi tube used for the limited flow test, a further preferred embodiment of the present invention is that the fluid tube 1 is composed of an outer tube 1.1 and an inner tube 1.2 nested type The assembly is made, wherein the inner tube 1.2 is divided into several sections, and the gaps forming the annular groove 2 are arranged between the several sections of the inner tube 1.2.

In order to facilitate the processing, manufacture, installation and debugging of the adjustable venturi tube used for the limited flow test, a further preferred embodiment of the present invention is that the outer tube 1.1 in the fluid tube 11 is a steel tube, and the inner tube 1.2 For plastic tubes.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principles of the present invention, several improvements and modifications can be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (10)

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.

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