CN114995528A - Passive flow control equipment - Google Patents
Passive flow control equipment Download PDFInfo
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- CN114995528A CN114995528A CN202210408559.2A CN202210408559A CN114995528A CN 114995528 A CN114995528 A CN 114995528A CN 202210408559 A CN202210408559 A CN 202210408559A CN 114995528 A CN114995528 A CN 114995528A
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- water inlet
- pipe
- water
- horizontal
- flow
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Float Valves (AREA)
Abstract
The invention discloses passive flow control equipment which comprises a water inlet assembly, a transition cavity and a water discharge pipe, wherein the water inlet assembly is communicated with the side wall of the transition cavity; the water flowing in from the vertical water inlet pipe and the water flowing in from the horizontal water inlet pipe form hedging, the tangential component of the total momentum of the water flow is offset, and the water flow vertically flows into the water drainage pipe; the water inlet device has the advantages that large-flow water inlet is realized, when the water level is lowered, the floating ball is arranged in the vertical water inlet pipe and can fall down to shield an opening formed on the ball seat, so that water flow can only flow in from the horizontal water inlet pipe, the water flow of the vertical water inlet pipe is instantly cut off, high-flow and low-flow instant switching can be realized, the requirements that when the safety injection box is used for injecting a loop emergency coolant, the initial rated flow of safety injection is large, the injection flow drops steeply after dozens of seconds, and the low-level condition is maintained for a long time are met.
Description
Technical Field
The invention relates to the technical field of fluid resistance equipment, in particular to passive flow control equipment.
Background
In the nuclear power field, a plurality of flow regulation problems are related, and especially for safety related systems such as safety injection, safety injection and containment cooling systems, the reliability, timeliness and accuracy of flow regulation after an accident are directly related to the safety of a nuclear power plant. The safety injection box is used for injecting a primary loop emergency coolant when a nuclear power station reactor has an accident, and is characterized by high nonlinearity of safety injection flow. At the beginning of safety injection, the rated flow is large, and after dozens of seconds, the injection flow is required to be sharply reduced and maintained at a low level for a long time, which brings great difficulty to the resistance design of the safety injection box.
Disclosure of Invention
In view of the defects in the prior art, the invention aims to provide a passive flow control device capable of realizing instantaneous switching of high and low flows.
In order to realize the purpose, the technical scheme adopted by the invention is as follows:
a passive flow control device comprises a water inlet assembly, a transition cavity and a water drain pipe, wherein
The drain pipe is communicated with the bottom of the transition cavity;
the water inlet assembly is communicated with the side wall of the transition cavity and comprises a vertical water inlet pipe, a horizontal conversion pipe and a horizontal water inlet pipe;
one end of the horizontal conversion pipe is communicated with the side wall of the transition cavity, and the other end of the horizontal conversion pipe is communicated with the bottom end of the vertical water inlet pipe;
one end of the horizontal water inlet pipe is communicated with the joint of the side wall of the transition cavity and one end of the horizontal conversion pipe;
the water inlet has been seted up on the pipe wall of vertical inlet tube, and the internally mounted of vertical inlet tube has floater and ball seat, is formed with the opening on the ball seat, and the inner wall of vertical inlet tube is fixed in to the ball seat, and the floater is located the top of ball seat, and the floater operatively shields the opening.
Furthermore, the transition cavity is cylindrical, the horizontal conversion pipe is a straight pipe, and the axis of the horizontal conversion pipe is tangent to the side edge of the transition cavity.
Furthermore, the section of the horizontal water inlet pipe is wedge-shaped, and one wedge-shaped edge of the horizontal water inlet pipe is tangent to the side edge of the transition cavity.
Furthermore, the included angle between the water flow direction of the horizontal water inlet pipe and the water flow direction of the horizontal conversion pipe is 5-10 degrees.
Further, a vortex breaker is further installed inside the vertical water inlet pipe and located below the ball seat.
Furthermore, the floating ball is a hollow ball, the hollow part of the floating ball is positioned at the upper part of the floating ball, nitrogen is filled in the hollow part of the floating ball, and the pressure is between 1.5MPa and 2 MPa.
Furthermore, the floating ball is made of metal or plastic.
Furthermore, there are three groups of water inlet assemblies, and the three groups of water inlet assemblies are arranged around the transition cavity at equal angle intervals.
Further, the lengths of the vertical water inlet pipes in each group of water inlet assemblies are different.
Further, the bottom end of the vertical water inlet pipe is connected with the other end of the horizontal conversion pipe through threads.
The invention has the beneficial effects that: the invention provides passive flow control equipment which is characterized in that a drain pipe is communicated with the bottom of a transition cavity, a water inlet assembly is communicated with the side wall of the transition cavity, one end of a horizontal conversion pipe is communicated with the side wall of the transition cavity, the other end of the horizontal conversion pipe is communicated with the bottom end of a vertical water inlet pipe, and one end of the horizontal water inlet pipe is communicated with the joint of the side wall of the transition cavity and one end of the horizontal conversion pipe; then the water flowing in from the vertical water inlet pipe and the water flowing in from the horizontal water inlet pipe form a hedging effect after the direction of the water flowing in from the vertical water inlet pipe is changed by the horizontal conversion pipe, the tangential components of the total momentum of the two water flows are offset, and the water flows vertically flow into the water discharge pipe; the water inlet pipe has the advantages that large-flow water inlet is realized, when the water level is lowered and the water pressure is not enough to support the floating ball, the floating ball is arranged in the vertical water inlet pipe and can fall down to shield an opening formed in the ball seat, so that water flow can only flow into the horizontal water inlet pipe, instantaneous switching between high flow and low flow can be realized by instantaneously cutting off the water flow of the vertical water inlet pipe, and the requirements that when the safety injection box is used for injecting a primary circuit emergency coolant, the initial rated flow of safety injection is large, the injection flow drops steeply after dozens of seconds, and the low level is maintained for a long time are met.
Drawings
FIG. 1 is a perspective view of a passive flow control device provided in an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a passive flow control device provided in an embodiment of the present invention;
FIG. 3 is a partial cross-sectional view of a vertical inlet pipe provided in an embodiment of the invention;
FIG. 4 is a schematic illustration of an installation of a passive flow control device provided in an embodiment of the present invention;
FIG. 5 is a high flow fluid velocity cloud for a passive flow control device provided in an embodiment of the present invention;
fig. 6 is a low flow fluid velocity cloud of a passive flow control device provided in an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
Referring to fig. 1 to 3, a passive flow control device of the present embodiment includes a water inlet assembly 1, a transition chamber 2, and a water outlet pipe 3, wherein the water outlet pipe 3 is communicated with the bottom of the transition chamber 2; the water inlet assembly 1 is communicated with the side wall of the transition cavity 2, and the water inlet assembly 1 comprises a vertical water inlet pipe 11, a horizontal conversion pipe 12 and a horizontal water inlet pipe 13; one end of the horizontal switching pipe 12 is communicated with the side wall of the transition chamber 2, and the other end of the horizontal switching pipe 12 is communicated with the bottom end of the vertical water inlet pipe 11, and the bottom end of the vertical water inlet pipe 11 is connected with the other end of the horizontal switching pipe 12 through threads in the embodiment. One end of the horizontal water inlet pipe 13 is communicated with the joint of the side wall of the transition cavity 2 and one end of the horizontal conversion pipe 12; the water inlet has been seted up on the pipe wall of vertical inlet tube 11, and the internally mounted of vertical inlet tube 11 has floater 14 and ball seat 15, is formed with the opening on the ball seat 15, and ball seat 15 is fixed in the inner wall of vertical inlet tube 11, and floater 14 is located the top of ball seat 15, and floater 14 maneuverability shields the opening. It should be noted that the water inlet assemblies 1 of the present embodiment have three sets, and the three sets of water inlet assemblies 1 are arranged around the transition chamber 2 at equal angular intervals. And the lengths of the vertical water inlet pipes 11 in each group of water inlet assemblies 1 are different, and the three vertical water inlet pipes 11 are uniformly arranged in the circumferential direction of the transition cavity 2 from high to low anticlockwise according to the heights. Of course, the number of the water inlet assemblies 1 can be set according to actual needs.
Further, the transition chamber 2 of the present embodiment is cylindrical, the horizontal transition pipe 12 is a straight pipe, and the axis of the horizontal transition pipe 12 is tangential to the side of the transition chamber 2. The section of the horizontal inlet pipe 13 is wedge-shaped, and one wedge-shaped edge of the horizontal inlet pipe 13 is tangent to the side edge of the transition cavity 2. The included angle between the water flow direction of the horizontal water inlet pipe 13 and the water flow direction of the horizontal conversion pipe 12 is 5-10 degrees, so that the tangential components of the total momentum of the two water flows can be offset, and the two incoming flow hedging effect is formed. It is easy to understand that the height and diameter of the vertical inlet pipe 11 and the size of the horizontal inlet pipe 13 can be adjusted according to application requirements, so as to realize adjustment of different flow rates and corresponding injection time.
Further, a vortex breaker 16 is installed inside the vertical water inlet pipe 11, the vortex breaker 16 is located below the ball seat 15, and the vortex breaker 16 can prevent vortex-entrained gas formed in the pipe from entering the interior of the transition chamber 2.
Furthermore, the floating ball 14 is a hollow ball, the hollow of the floating ball 14 is positioned at the upper part of the floating ball 14, and the hollow of the floating ball 14 is filled with nitrogen and has the pressure of 1.5 MPa-2 MPa. It is easy to understand that the material of the floating ball 14 can be selected according to actual needs. For example, the floating ball 14 may be made of metal or plastic, in this embodiment, polyvinyl butyral is used as the plastic, and it is needless to say that thermoplastic plastics such as polycarbonate fiber may be used according to actual needs.
With reference to fig. 4 to 5, the passive flow control device of this embodiment communicates with the bottom of the transition chamber 2 through the drain pipe 3, the water inlet assembly 1 communicates with the side wall of the transition chamber 2, one end of the horizontal switching pipe 12 communicates with the side wall of the transition chamber 2, the other end of the horizontal switching pipe 12 communicates with the bottom end of the vertical water inlet pipe 11, and one end of the horizontal water inlet pipe 13 communicates with the joint between the side wall of the transition chamber 2 and one end of the horizontal switching pipe 12; then the water flowing in from the vertical water inlet pipe 11 changes direction through the horizontal switching pipe 12 and then forms a pair impact with the water flowing in from the horizontal water inlet pipe 13, the tangential components of the total momentum of the two water flows are offset, and the water flows vertically into the water outlet pipe 3; therefore, large-flow water inlet is realized, when the water level is lowered and the water pressure is not enough to support the floating ball 14, the floating ball 14 arranged in the vertical water inlet pipe 11 can fall to shield an opening formed on the ball seat 15, so that water flow can only flow in from the horizontal water inlet pipe 13, and at the moment, fluid flows into the transition cavity 2 through the horizontal water inlet pipe 13 to form a vortex in the transition cavity 2. The instantaneous switching of height flow can be realized to the rivers of cutting off vertical inlet tube 11 of instant, when satisfying the safety injection case and being used for the urgent coolant of a return circuit to inject, the initial rated flow of safety injection is great, and injected flow drops suddenly behind tens of seconds to maintain in the requirement of lower level for a long time, possess fine practicality.
The device of the present invention is not limited to the embodiments of the specific embodiments, and other embodiments can be derived by those skilled in the art from the technical solutions of the present invention, and the device of the present invention also belongs to the technical innovation and protection scope of the present invention.
Claims (10)
1. A passive flow control device comprises a water inlet assembly, a transition chamber and a water outlet pipe, wherein the water inlet assembly, the transition chamber and the water outlet pipe are arranged in the transition chamber
The drain pipe is communicated with the bottom of the transition cavity;
the water inlet assembly is communicated with the side wall of the transition cavity and comprises a vertical water inlet pipe, a horizontal conversion pipe and a horizontal water inlet pipe;
one end of the horizontal conversion pipe is communicated with the side wall of the transition cavity, and the other end of the horizontal conversion pipe is communicated with the bottom end of the vertical water inlet pipe;
one end of the horizontal water inlet pipe is communicated with the joint of the side wall of the transition cavity and one end of the horizontal conversion pipe;
the water inlet is formed in the pipe wall of the vertical water inlet pipe, a floating ball and a ball seat are mounted inside the vertical water inlet pipe, an opening is formed in the ball seat, the ball seat is fixed to the inner wall of the vertical water inlet pipe, the floating ball is located above the ball seat, and the floating ball can operatively shield the opening.
2. The passive flow control device of claim 1, wherein the transition chamber is cylindrical and the level shifter tube is a straight tube with an axis tangential to a side of the transition chamber.
3. The passive flow control device of claim 2, wherein the horizontal inlet conduit is wedge-shaped in cross-section, one wedge-shaped edge of the horizontal inlet conduit being tangent to a side edge of the transition chamber.
4. The passive flow control device according to claim 3, wherein an included angle between the water flow direction of the horizontal water inlet pipe and the water flow direction of the horizontal switching pipe is 5-10 °.
5. The passive flow control device of claim 1, wherein a vortex breaker is further mounted inside the vertical inlet pipe, the vortex breaker being located below the ball seat.
6. The passive flow control device according to claim 1, wherein the floating ball is a hollow ball, the hollow of the floating ball is located at an upper portion of the floating ball, and the hollow of the floating ball is filled with nitrogen and has a pressure of 1.5MPa to 2 MPa.
7. The passive flow control device of claim 6, wherein the floating ball is made of metal or plastic.
8. A passive flow control device according to any of claims 1 to 6, wherein there are three sets of water inlet means, the three sets of water inlet means being equiangularly spaced around the transition chamber.
9. The passive flow control device of claim 8, wherein the vertical inlet conduits of each set of inlet assemblies are all of different lengths.
10. A passive flow control device according to any of claims 1 to 6, wherein the bottom end of the vertical inlet pipe is connected to the other end of the horizontal transfer pipe by a screw thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210408559.2A CN114995528A (en) | 2022-04-19 | 2022-04-19 | Passive flow control equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210408559.2A CN114995528A (en) | 2022-04-19 | 2022-04-19 | Passive flow control equipment |
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| Publication Number | Publication Date |
|---|---|
| CN114995528A true CN114995528A (en) | 2022-09-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210408559.2A Pending CN114995528A (en) | 2022-04-19 | 2022-04-19 | Passive flow control equipment |
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| CN (1) | CN114995528A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115440399A (en) * | 2022-09-16 | 2022-12-06 | 中国核动力研究设计院 | Damper test body structure suitable for multi-geometric-parameter combination research of novel safety injection box |
-
2022
- 2022-04-19 CN CN202210408559.2A patent/CN114995528A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115440399A (en) * | 2022-09-16 | 2022-12-06 | 中国核动力研究设计院 | Damper test body structure suitable for multi-geometric-parameter combination research of novel safety injection box |
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