阅读说明：本技术 一种非能动流体输送设备及方法 (Passive fluid conveying equipment and method ) 是由 王开宇 高化云 高伟民 梁峰 于 2020-12-31 设计创作，主要内容包括：本发明提出的非能动流体输送设备及方法,利用伯努利原理,通过将气流控制装置与可逆转流体泵相结合,在实现没有运动部件的流体输送过程的基础上,提高设备的可靠性、安全性和使用寿命。所述可逆转流体泵使用时放置于流体供液槽的底部,且设计为柱形本体,可将其径向尺寸与输送管道的径向尺寸设计为相同,以便于将柱形本体的两端部直接与输送管道焊接到一起,减少焊接点位,提高设备的使用寿命。直接在柱形本体内部开相互对称的多段式轴孔,加工及装配方便,无需进行多余连接。(The passive fluid conveying equipment and the passive fluid conveying method utilize the Bernoulli principle, and improve the reliability, the safety and the service life of the equipment on the basis of realizing the fluid conveying process without moving parts by combining the airflow control device with the reversible fluid pump. The reversible fluid pump is placed at the bottom of the fluid liquid supply tank when in use, is designed into a cylindrical body, and can be designed into the same radial size with the radial size of the conveying pipeline, so that two end parts of the cylindrical body are directly welded with the conveying pipeline together, welding point positions are reduced, and the service life of equipment is prolonged. The multi-section shaft holes which are symmetrical to each other are directly formed in the cylindrical body, so that the processing and the assembly are convenient, and redundant connection is not needed.)

1. A passive fluid conveying device is characterized by comprising an air flow control device, a liquid supply tank, a receiving tank, an energy storage cylinder and a reversible fluid pump, wherein the energy storage cylinder and the reversible fluid pump are arranged in the liquid supply tank;

the reversible fluid pump comprises a cylindrical body, a side taper hole and a multi-section shaft hole symmetrically arranged in the cylindrical body, wherein the multi-section shaft hole sequentially comprises a cylindrical hole, a transition taper hole and a nozzle taper hole which are communicated with each other; the small-diameter end of the transition taper hole is connected with the cylindrical hole, the large-diameter end of the transition taper hole is connected with the small-diameter end of the spout taper hole, the large-diameter end of the spout taper hole extends to the end face of the cylindrical body, and the other end of the cylindrical hole is connected with the cylindrical hole of the symmetrical multi-section shaft hole; the side surface taper hole is formed in the side wall of the cylindrical body corresponding to the cylindrical hole; the small-diameter end of the side taper hole is communicated with the cylindrical hole;

one end of the cylindrical body is fixedly connected with a fluid inlet pipe communicated with the energy storage cylinder, and the other end of the cylindrical body is fixedly connected with a fluid outlet pipe, and the fluid outlet pipe conveys fluid to the receiving tank;

the air flow control device pumps air or gas which is insoluble in the conveying fluid into the energy storage cylinder to finish the conveying of the fluid from the side taper hole of the reversible fluid pump to the energy storage cylinder and then from the energy storage cylinder to the receiving tank through the symmetrically arranged multi-section shaft holes of the reversible fluid pump.

2. The passive fluid transfer device according to claim 1, wherein the air flow control means includes an air ejector group including an i-shaped connection pipe including a first arm pipe, a second arm pipe, and a connection arm pipe communicating the first arm pipe and the second arm pipe; a pressure flushing spray pipe is fixed on the upper side of the first arm pipe, a first Laval spray pipe is fixed on the lower side of the first arm pipe, a nozzle of the pressure flushing spray pipe is positioned in a contraction pipe of the first Laval spray pipe and is opposite to a throat pipe of the first Laval spray pipe, and a first mixing chamber is formed by a gap between the nozzle of the pressure flushing spray pipe and the contraction pipe of the first Laval spray pipe; a vacuum spray pipe is fixed on the upper side of the second arm pipe, a second Laval spray pipe is fixed on the lower side of the second arm pipe, a nozzle of the vacuum spray pipe is positioned in a contraction pipe of the second Laval spray pipe and is opposite to a throat pipe of the second Laval spray pipe, and a second mixing chamber is formed by a gap between the nozzle of the vacuum spray pipe and the contraction pipe of the second Laval spray pipe; the first mixing chamber is communicated with the second mixing chamber through the connecting arm pipe.

3. The passive fluid transfer device of claim 2, wherein a distance between the nozzle of the pressure ram and the throat of the first laval nozzle is less than a distance between the nozzle of the vacuum nozzle and the throat of the second laval nozzle.

4. The passive fluid transport apparatus according to claim 2 or 3, wherein a ratio of a nozzle diameter of the pressure ram nozzle to a throat diameter of the first laval nozzle is greater than a ratio of a nozzle diameter of the vacuum nozzle to a throat diameter of the second laval nozzle; and/or the diameter of the throat of the first laval nozzle is smaller than the diameter of the throat of the second laval nozzle; and/or the nozzle diameter of the pressure flush lance is greater than the nozzle diameter of the vacuum flush lance.

5. The passive fluid transfer device of claim 4, wherein the ram nozzle is connected to the high pressure air delivery means through a first valve body, and the vacuum nozzle is connected to the high pressure air delivery means through a second valve body; the diffusion pipe of the first Laval nozzle is connected with the energy storage cylinder through an energy conversion pipeline; and the diffusion pipe of the second Laval nozzle is connected with a tail gas treatment system.

6. The passive fluid transfer device of claim 5, wherein the axes of the side bores are located on a plane of symmetry of the symmetrically disposed multi-segment shaft bore; and/or the diameter of the small-diameter end of the side taper hole is larger than that of the cylindrical hole; and/or the side taper holes are arranged on the side wall of the cylindrical body in a central symmetry manner, and the sum of the diameters of the small-diameter ends of the side taper holes is larger than the diameter of the large-diameter end of the spout taper hole.

7. The passive fluid transfer device of claim 6, wherein the small diameter end of the side taper bore communicates with the cylindrical bore through a coaxial cuboid cylindrical bore.

8. The passive fluid transfer device of claim 7, wherein the length of the short side of the cuboid cylindrical bore is longer than the diameter of the cylindrical bore.

9. The passive fluid transfer device of claim 8, wherein the taper of the transition taper is less than or equal to the taper of the spout taper; and/or the cylindrical body is a cylindrical body; and/or the reversible fluid pump comprises at least 1 side taper hole which is centrosymmetrically arranged on the side surface of the cylindrical body.

10. A passive fluid transport method for passive transport of a fluid using the passive fluid transport device according to any one of claims 5 to 9, comprising the steps of:

s1, a back suction process; the first valve body is closed, the second valve body is opened, the high-pressure air delivery device delivers compressed air to the vacuum spray pipe, the compressed air is sprayed into the second Laval spray pipe through the nozzle of the vacuum spray pipe, and vacuum pressure is formed in the second mixing chamber; the vacuum air pressure enables the energy storage cylinder and the liquid supply tank to generate pressure difference, so that fluid in the liquid supply tank is pushed to enter a multi-section shaft hole on the side connected with the energy storage cylinder through a side taper hole of the reversible fluid pump, and then the fluid is pumped to enter the energy storage cylinder, and the conversion between air pressure energy and fluid potential energy is realized; until the energy storage cylinder is filled with fluid;

s2, conveying process; when the energy storage cylinder is filled with fluid, the second valve body is closed, the first valve body is opened, the high-pressure air conveying device conveys compressed air to the pressure flushing spray pipe and generates pressure, pulse pressure is directly sprayed into the first Laval spray pipe through a nozzle of the pressure flushing spray pipe, the fluid in the energy storage cylinder is pushed through the transduction pipeline, accelerated through the multi-section shaft hole of the reversible fluid pump, directly sprayed into the symmetrical multi-section shaft hole of the reversible fluid pump, and finally flows into the receiving tank; until no fluid is stored in the energy storage cylinder;

s3, a buffering process; after the conveying process is finished, the first valve body is closed, and the pressure in the energy storage cylinder is naturally exhausted and released through the first Laval nozzle, the first mixing chamber, the connecting arm pipe, the second mixing chamber and the second Laval nozzle;

s4, circulating S1-S3.

Technical Field

The invention relates to the field of fluid conveying, in particular to the field of conveying radioactive fluid or highly toxic fluid, and specifically relates to passive fluid conveying equipment and a passive fluid conveying method.

Background

The passive safety system refers to a system which does not depend on external triggering and power sources and realizes safety functions by natural characteristics such as natural convection, gravity, pressure accumulation and the like.

At present, for the treatment of radioactive fluid or other high-toxicity fluid, such as the transportation of radioactive liquid in a nuclear post-treatment plant, because the object to be transported is medium or high radioactive solution or other high-toxicity fluid, the whole treatment equipment must be placed in an equipment room with a biological shielding layer, and the transportation equipment is required to have no moving parts, simple structure, reliable operation, convenient operation and minimum maintenance. In the known delivery devices, conventional mechanical pumps obviously do not meet the above requirements. Although the steam jet pump can satisfy the above requirements, the use of steam as a transport medium increases the transport of the waste liquid, severely reduces the transport efficiency and increases the subsequent throughput of the waste liquid.

Disclosure of Invention

The invention provides passive fluid conveying equipment and a passive fluid conveying method, which utilize the Bernoulli principle, improve the reliability and the safety of the equipment and prolong the service life of the equipment on the basis of realizing the fluid conveying process without moving parts by combining an airflow control device and a reversible fluid pump.

The technical scheme of the invention is as follows:

a passive fluid conveying device comprises an air flow control device, a fluid supply tank, a receiving tank, an energy storage cylinder and a reversible fluid pump, wherein the energy storage cylinder and the reversible fluid pump are arranged in the fluid supply tank; the reversible fluid pump comprises a cylindrical body, a side taper hole and a multi-section shaft hole symmetrically arranged in the cylindrical body, wherein the multi-section shaft hole sequentially comprises a cylindrical hole, a transition taper hole and a nozzle taper hole which are communicated with each other; the small-diameter end of the transition taper hole is connected with the cylindrical hole, the large-diameter end of the transition taper hole is connected with the small-diameter end of the spout taper hole, the large-diameter end of the spout taper hole extends to the end face of the cylindrical body, and the other end of the cylindrical hole is connected with the cylindrical hole of the symmetrical multi-section shaft hole; the side surface taper hole is arranged on the side wall of the cylindrical body corresponding to the cylindrical hole, and the axis of the side surface taper hole is positioned on the symmetrical surface of the symmetrically-arranged multi-section shaft hole; and the small-diameter end of the side taper hole is communicated with the cylindrical hole.

One end of the cylindrical body is fixedly connected with a fluid inlet pipe communicated with the energy storage cylinder, and the other end of the cylindrical body is fixedly connected with a fluid outlet pipe, and the fluid outlet pipe conveys fluid to the receiving tank; the air flow control device pumps air or gas which is insoluble in the conveying fluid into the energy storage cylinder to finish the conveying of the fluid from the side taper hole of the reversible fluid pump to the energy storage cylinder and then from the energy storage cylinder to the receiving tank through the symmetrically arranged multi-section shaft holes of the reversible fluid pump.

Preferably, the side taper holes are arranged on the side wall of the cylindrical body in a centrosymmetric manner, and the sum of the diameters of the small-diameter ends of the side taper holes is larger than the diameter of the large-diameter end of the spout taper hole.

Preferably, the air flow control device comprises an air ejector group, the air ejector group comprises an I-shaped connecting pipe, and the I-shaped connecting pipe comprises a first arm pipe, a second arm pipe and a connecting arm pipe communicated with the first arm pipe and the second arm pipe; a pressure flushing spray pipe is fixed on the upper side of the first arm pipe, a first Laval spray pipe is fixed on the lower side of the first arm pipe, a nozzle of the pressure flushing spray pipe is positioned in a contraction pipe of the first Laval spray pipe and is opposite to a throat pipe of the first Laval spray pipe, and a first mixing chamber is formed by a gap between the nozzle of the pressure flushing spray pipe and the contraction pipe of the first Laval spray pipe; a vacuum spray pipe is fixed on the upper side of the second arm pipe, a second Laval spray pipe is fixed on the lower side of the second arm pipe, a nozzle of the vacuum spray pipe is positioned in a contraction pipe of the second Laval spray pipe and is opposite to a throat pipe of the second Laval spray pipe, and a second mixing chamber is formed by a gap between the nozzle of the vacuum spray pipe and the contraction pipe of the second Laval spray pipe; the first mixing chamber is communicated with the second mixing chamber through the connecting arm pipe.

Preferably, the distance between the nozzle of the pressure flushing lance and the throat of the first laval lance is smaller than the distance between the nozzle of the vacuum lance and the throat of the second laval lance.

Preferably, the ratio of the nozzle diameter of the pressure lance to the throat diameter of the first laval lance is greater than the ratio of the nozzle diameter of the vacuum lance to the throat diameter of the second laval lance; and/or the diameter of the throat of the first laval nozzle is smaller than the diameter of the throat of the second laval nozzle; and/or the nozzle diameter of the pressure flush lance is greater than the nozzle diameter of the vacuum flush lance.

Preferably, the pressure flushing spray pipe is connected with the high-pressure air conveying device through a first valve body, and the vacuum spray pipe is connected with the high-pressure air conveying device through a second valve body; the diffusion pipe of the first Laval nozzle is connected with the energy storage cylinder through an energy conversion pipeline; and the diffusion pipe of the second Laval nozzle is connected with a tail gas treatment system.

Preferably, the axis of the side taper hole is located on the symmetrical plane of the symmetrically arranged multi-section shaft hole; and/or the diameter of the small-diameter end of the side taper hole is larger than that of the cylindrical hole.

Preferably, the small-diameter end of the side taper hole is communicated with the cylindrical hole through a coaxial cuboid cylindrical hole.

Preferably, the length of the short side of the rectangular parallelepiped pillar hole is longer than the diameter of the cylindrical hole.

Preferably, the taper of the transition taper hole is smaller than or equal to that of the spout taper hole; and/or the cylindrical body is a cylindrical body; and/or the reversible fluid pump comprises at least 1 side taper hole which is centrosymmetrically arranged on the side surface of the cylindrical body.

A passive fluid transfer method for performing passive transfer of a fluid using the passive fluid transfer device, comprising the steps of:

s1, a back suction process; the first valve body is closed, the second valve body is opened, the high-pressure air delivery device delivers compressed air to the vacuum spray pipe, the compressed air is sprayed into the second Laval spray pipe through the nozzle of the vacuum spray pipe, and vacuum pressure is formed in the second mixing chamber; the vacuum air pressure enables the energy storage cylinder and the liquid supply tank to generate pressure difference, so that fluid in the liquid supply tank is pushed to enter a multi-section shaft hole on the side connected with the energy storage cylinder through a side taper hole of the reversible fluid pump, and then the fluid is pumped to enter the energy storage cylinder, and the conversion between air pressure energy and fluid potential energy is realized; until the energy storage cylinder is filled with fluid;

s2, conveying process; when the energy storage cylinder is filled with fluid, the second valve body is closed, the first valve body is opened, the high-pressure air conveying device conveys compressed air to the pressure flushing spray pipe and generates pressure, pulse pressure is directly sprayed into the first Laval spray pipe through a nozzle of the pressure flushing spray pipe, the fluid in the energy storage cylinder is pushed through the transduction pipeline, accelerated through the multi-section shaft hole of the reversible fluid pump, directly sprayed into the symmetrical multi-section shaft hole of the reversible fluid pump, and finally flows into the receiving tank; until no fluid is stored in the energy storage cylinder;

s3, a buffering process; after the conveying process is finished, the first valve body is closed, and the pressure in the energy storage cylinder is naturally exhausted and released through the first Laval nozzle, the first mixing chamber, the connecting arm pipe, the second mixing chamber and the second Laval nozzle;

s4, circulating S1-S3.

Compared with the prior art, the invention has the advantages that:

1. the passive fluid conveying equipment and the passive fluid conveying method utilize the Bernoulli principle, and improve the reliability, the safety and the service life of the equipment on the basis of realizing the fluid conveying process without moving parts by combining the airflow control device with the reversible fluid pump. The reversible fluid pump is placed at the bottom of the fluid liquid supply tank when in use, is designed into a cylindrical body, and can be designed into the same radial size with the radial size of the conveying pipeline, so that two end parts of the cylindrical body are directly welded with the conveying pipeline together, welding point positions are reduced, and the service life of equipment is prolonged. The multi-section shaft holes which are symmetrical to each other are directly formed in the cylindrical body, so that the processing and the assembly are convenient, and redundant connection is not needed.

2. The invention provides a passive fluid conveying device and a method, wherein a lateral taper hole is arranged on the lateral surface of a cylindrical body of a reversible fluid pump to be used as a fluid suction inlet (namely an entrainment part) and is communicated with a multi-section shaft hole of the cylindrical body, once the pressure at the large diameter part of a nozzle taper hole of the multi-section shaft hole at one end of the cylindrical body is smaller than the pressure in a fluid supply tank, the fluid in the fluid supply tank can enter the multi-section shaft hole through the lateral taper hole and then flows into an energy storage cylinder, at the moment, the pressure at two ends of the symmetrical multi-section shaft hole is unchanged, so the fluid cannot flow into a receiving tank, and the process is a reverse suction process. The pressure at the large diameter part of the nozzle conical hole of the multi-section type shaft hole at one end of the cylindrical body is changed to be larger than the pressure in the liquid supply tank, and due to the special structure of the multi-section type shaft hole, after the fluid is accelerated through the nozzle conical hole, the transition conical hole and the cylindrical hole, the flow velocity of the fluid in the cylindrical hole can even reach sonic velocity or supersonic velocity, and then the fluid in the cylindrical hole is directly injected into the cylindrical hole of the symmetrical multi-section type shaft hole, sequentially flows through the transition conical hole and the nozzle conical hole, and continuously accelerates to flow into the receiving tank, and the process is a conveying process; due to the fact that the flow velocity of the fluid in the cylindrical hole is ultrahigh, a part of fluid in the fluid supply tank is entrained by the conical holes on the side face to flow to the receiving tank, and the fluid conveying efficiency is improved. When the liquid is not stored in the energy storage cylinder, the air flow above the vacuum ejector and the pressure ejector is sealed at the same time, and the air in the energy storage cylinder is naturally exhausted and released through the first Laval nozzle, the first mixing chamber, the connecting arm pipe, the second mixing chamber and the second Laval nozzle, namely the buffering process.

3. The invention provides passive fluid conveying equipment and a passive fluid conveying method, wherein the sum of the diameters of radial holes communicated with the cylindrical hole and small-diameter ends of a plurality of side conical holes of a reversible fluid pump is larger than the diameter of a large-diameter end of a nozzle conical hole, so that the flow stability in the back suction process is maintained.

4. According to the passive fluid conveying equipment and the passive fluid conveying method, the air ejector set adopts the I-shaped connecting pipe to connect the pressure impact ejector and the vacuum ejector, and the pressure impact ejector and the vacuum ejector work cooperatively to convey passive fluid, so that the passive fluid conveying equipment is simple in structure, free of maintenance and capable of being replaced quickly, and can meet remote operation requirements.

Drawings

FIG. 1 is a schematic block diagram of one embodiment of a passive fluid delivery apparatus of the present invention;

FIG. 2 is a schematic three-dimensional view of a reversible fluid pump of the passive fluid transfer device of the present invention;

FIG. 3 is a schematic cross-sectional front view of a reversible fluid pump of the passive fluid transfer device of the present invention;

FIG. 4 is a schematic cross-sectional view of a multi-sectional axial hole of a reversible fluid pump of the passive fluid transfer device of the present invention;

FIG. 5 is a schematic view of the air jet stack configuration of the passive fluid transport device of the present invention;

FIG. 6 is a schematic diagram of the suck-back process operation of the passive fluid delivery method of the present invention; wherein the direction of the arrow is the direction of flow of air or nuclear waste liquid;

FIG. 7 is a schematic view of the delivery process operation of the passive fluid delivery method of the present invention; wherein the direction of the arrow is the direction of flow of air or nuclear waste liquid;

FIG. 8 is a schematic illustration of the buffering process of the passive fluid delivery method of the present invention; wherein the direction of the arrows is the direction of flow of air or nuclear waste liquid.

The reference numbers in the figures are:

1-an air flow control device, 11-an air jet stack, 111-an i-connection, 1111-a first arm, 1112-a second arm, 1113-a connection arm, 112-a thrust jet, 1121-a nozzle of a thrust jet, 113-a first laval jet, 1131-a convergent tube of a first laval jet, 1132-a throat of a first laval jet, 1133-a diffuser of a first laval jet, 114-a vacuum jet, 1141-a nozzle of a vacuum jet, 115-a second laval jet, 1151-a convergent tube of a second laval jet, 1152-a throat of a second laval jet, 1153-a diffuser of a second laval jet, 116-a first mixing chamber, 117-a second mixing chamber, 12-a first valve body, 13-a second valve body, 14-a high pressure air delivery device, 15-an exhaust gas treatment system, 16-a thrust jet, 17-a vacuum jet;

2-a liquid supply tank;

3, an energy storage cylinder;

4-reversible fluid pump, 41-cylindrical body, 42-side taper hole, 43-multi-section shaft hole, 431-cylindrical hole, 432-transition taper hole, 433-spout taper hole, 43' -symmetrical multi-section shaft hole, 44-cuboid cylindrical hole;

5-a receiving tank; 6-a fluid inlet tube; 7-a fluid outlet pipe; 8, a transduction pipeline.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described in more detail below with reference to specific examples and comparative examples.

Example 1

As shown in fig. 1, the passive fluid transfer apparatus according to an embodiment of the present invention is a simplified structure, and includes an air flow control device 1, a fluid supply tank 2, a receiving tank 5, and an energy storage cylinder 3 and a reversible fluid pump 4 disposed inside the fluid supply tank 2; the air flow control device 1 completes the transmission of fluid (such as nuclear waste liquid) from the side taper hole 42 of the reversible fluid pump 4 to the energy storage cylinder 3 and then from the energy storage cylinder 3 to the receiving tank 5 through the symmetrically arranged multi-section shaft hole 43 of the reversible fluid pump 4 by pumping air or gas insoluble in the transmission fluid into the energy storage cylinder 3.

The structure diagram of the reversible fluid pump 4 is shown in fig. 2-4, and includes a cylindrical body 41, a side taper hole 42, and a multi-section shaft hole 43 symmetrically disposed inside the cylindrical body 41, where the multi-section shaft hole 43 includes a cylindrical hole 431, a transition taper hole 432, and a nozzle taper hole 433 that are communicated with each other in sequence; the small-diameter end of the transition taper hole 432 is connected with the cylindrical hole 431, the large-diameter end is connected with the small-diameter end of the spout taper hole 433, the large-diameter end of the spout taper hole 433 extends to the end face of the cylindrical body 41, and the other end of the cylindrical hole 431 is directly connected with the cylindrical hole of the symmetrical multi-section shaft hole 43'. The cylindrical body 41 is preferably a cylindrical body and has an outer diameter designed to be equal to the outer diameter of the delivery pipes (e.g., the fluid inlet pipe 6 and the fluid outlet pipe 7) in order to facilitate welding the cylindrical body with the remaining delivery pipes.

The lateral surface of the cylindrical body 41 is provided with a lateral surface tapered hole 42 as a suction inlet (i.e. an entrainment part) of the nuclear waste liquid stored in the liquid supply tank 2, and the lateral surface tapered hole is communicated with the multi-section shaft hole 42 of the cylindrical body 41, so that once the pressure at the large diameter part of the nozzle tapered hole 433 of the multi-section shaft hole at one end of the cylindrical body 41 is smaller than the pressure in the liquid supply tank 2 (i.e. the air flow control device 1 sucks the air in the energy storage cylinder 3 to generate partial vacuum air pressure), the nuclear waste liquid in the liquid supply tank 2 can enter the multi-section shaft hole 43 from the cylindrical hole 431 through the lateral surface tapered hole 42 and then flows into the energy storage cylinder 3, at this time, the pressure at two ends of the symmetrical multi-section shaft hole 43' is not changed, so that the nuclear waste liquid cannot flow into the receiving tank. Changing the pressure at the large diameter of the nozzle taper hole of the multi-section shaft hole at one end of the cylindrical body 41 (i.e. the air flow control device 1 applies pulse pressure to the inside of the energy storage cylinder 3) to make the pressure greater than the pressure in the liquid supply tank 2, wherein due to the special structure of the multi-section shaft hole 43, the nuclear waste liquid is accelerated through the nozzle taper hole 433, the transition taper hole 432 and the cylindrical hole 431, and then the flow rate of the nuclear waste liquid in the cylindrical hole 431 can even reach sonic velocity or supersonic velocity, so that the nuclear waste liquid in the nuclear waste liquid is directly sprayed into the cylindrical hole of the symmetrical multi-section shaft hole 43', sequentially flows through the transition taper hole and the nozzle taper hole, and continuously and acceleratedly flows into the receiving tank 5, which is the conveying process; due to the fact that the flow rate of the nuclear waste liquid in the cylindrical hole 431 is ultrahigh, the pressure at the position of the side taper hole 42 is reduced, and therefore a part of the nuclear waste liquid in the liquid supply tank 2 is entrained to flow to the receiving tank 5, and the conveying efficiency of the nuclear waste liquid is improved.

As shown in fig. 4, 4 side taper holes 42 are arranged on the side wall of the cylindrical body 41 corresponding to the cylindrical hole 431 in a central symmetry manner; the small-diameter end of each side surface taper hole 42 is communicated with the cylindrical hole 431, the side surface taper holes 42 are used as suction ports of nuclear waste liquid, and the sum of the diameters of the small-diameter ends of the side surface taper holes 42 is designed to be larger than the diameter of the large-diameter end of the nozzle taper hole 433; the fluid flow in the suck-back process can be ensured to be sufficient and stable.

One end of the cylindrical body 41 is fixedly connected with a fluid inlet pipe 6 communicated with the energy storage cylinder 3, the other end of the cylindrical body is fixedly connected with a fluid outlet pipe 7, and the fluid outlet pipe 7 conveys the nuclear waste liquid to the receiving tank 5; preferably, the fluid outlet pipe 7 is suspended above the receiving tank 5 and it is ensured that the liquid outlet of the fluid outlet pipe 7 is not submerged in the nuclear waste liquid in the receiving tank 5. So as to ensure that only the nuclear waste liquid in the liquid supply tank 2 is sucked back into the energy storage cylinder 3 in the back suction stage.

Preferably, the axes of the side taper holes 42 are located on the symmetrical plane of the symmetrically arranged multi-section shaft hole 43; preferably, the small diameter end of the side taper hole 42 is larger than the diameter of the cylindrical hole. The nuclear waste liquid in the back suction process can be ensured to have enough and stable fluid flow, and the nuclear waste liquid can be clamped to the symmetrical multi-section shaft hole 43' in the conveying process, so that the conveying efficiency is improved.

Preferably, the small-diameter end of the side taper hole 42 is communicated with the cylindrical hole 431 through a coaxial rectangular prism hole 44. And the side surface of the short side of the cuboid column hole is parallel to the axis of the column body 41, and the side surface of the long side is perpendicular to the axis of the column body 41, so that the nuclear waste liquid can be absorbed to the maximum extent in the back suction process and the conveying process. And the sum of the areas of the cuboid column holes 44 in the side surface taper holes 42 is designed to be larger than the area of the large-diameter end of the nozzle taper hole 433 or the length of the short side of the cuboid column hole 44 is longer than the diameter of the cylindrical hole, so that the sufficient and stable flow of the nuclear waste liquid in the back suction process is ensured.

Preferably, the taper of the transition taper hole 432 is smaller than or equal to the taper of the spout taper hole 433, and the side taper hole 42, the cylindrical hole 431, the transition taper hole 432 and the spout taper hole 433 form a special-shaped laval nozzle, so that the conveying speed of the nuclear waste liquid is increased.

Example 2

Unlike the above-described embodiment, as shown in fig. 5, the air flow control device 1 includes an air ejector set 11, the air ejector set 11 includes an i-shaped connection pipe 111, and the i-shaped connection pipe 111 includes a first arm pipe 1111, a second arm pipe 1112, and a connection arm pipe 1113 connecting the first arm pipe 1111 and the second arm pipe 1112; a pressure flushing nozzle 112 is fixed on the upper side of the first arm pipe 1111, a first laval nozzle 113 is fixed on the lower side of the first arm pipe 1111, a nozzle 1121 of the pressure flushing nozzle is positioned in a contraction pipe 1131 of the first laval nozzle and is opposite to a throat 1132 of the first laval nozzle, and a gap between the nozzle 1121 of the pressure flushing nozzle and the contraction pipe 1131 of the first laval nozzle forms a first mixing chamber 116; a vacuum nozzle 114 is fixed on the upper side of the second arm pipe 1112, a second laval nozzle 115 is fixed on the lower side of the second arm pipe 1112, a nozzle 1141 of the vacuum nozzle is positioned in a contracted pipe 1151 of the second laval nozzle and is opposite to a throat 1152 of the second laval nozzle, and a gap between the nozzle 1141 of the vacuum nozzle and the contracted pipe 1151 of the second laval nozzle forms a second mixing chamber 117; the first mixing chamber 116 communicates with the second mixing chamber 117 through the connecting arm pipe 1113.

The pressure flushing nozzle 112 is connected with the high-pressure air delivery device 14 through the first valve body 12, and the vacuum nozzle 114 is connected with the high-pressure air delivery device 14 through the second valve body 13; the diffusion pipe 1133 of the first laval nozzle is connected with the energy storage cylinder 3 through a transduction pipeline 8; the diffuser 1153 of the second laval nozzle is connected to the tail gas treatment system 15 or to an air recycling device.

The first arm 1111, the ram nozzle 112, the first laval nozzle 113 and the first mixing chamber 116 constitute the ram ejector 16, and the second arm 1112, the vacuum nozzle 114, the second laval nozzle 115 and the second mixing chamber 117 constitute the vacuum ejector 17. The vacuum ejector is used for forming partial vacuum air pressure in the connecting arm pipe 1113 and further forming partial vacuum air pressure in the energy storage cylinder, so that the pressure at the large diameter part of the nozzle taper hole 433 of the multi-section type shaft hole at one end of the cylindrical body 41 is smaller than the pressure in the liquid supply tank 2, and then nuclear waste liquid in the liquid supply tank 2 enters the multi-section type shaft hole 43 from the cylindrical hole 431 through the side taper hole 42 and further flows into the energy storage cylinder 3.

The pressure jet ejector 16 is used for applying pulse pressure to the energy storage cylinder 3, so that the pressure in the energy storage cylinder is larger than the pressure in the liquid supply tank 2, and the fluid in the energy storage cylinder directly flows into the receiving tank 5 through the reversible fluid pump 4, thereby completing the conveying process.

Preferably, the distance between the nozzle 1121 of the pressure lance and the throat 1132 of the first laval lance is smaller than the distance between the nozzle 1141 of the vacuum lance and the throat 1132 of the second laval lance; and/or the ratio of the diameter of the nozzle 1131 of the pressure ram to the diameter of the throat 1132 of the first laval nozzle is greater than the ratio of the diameter of the nozzle 1141 of the vacuum nozzle to the diameter of the throat 1152 of the second laval nozzle; and/or the diameter of the throat of the first laval nozzle is smaller than the diameter of the throat of the second laval nozzle; and/or the nozzle diameter of the pressure flush lance is greater than the nozzle diameter of the vacuum flush lance. To ensure that during the delivery process, the compressed air from the high pressure air delivery device 14 can be injected directly into the throat 1132 of the first laval nozzle, rather than entering the second laval nozzle 115 via the first mixing chamber 116.

Example 3

A passive fluid conveying method for performing passive conveying of fluid (such as nuclear waste liquid) by using the passive fluid conveying device comprises the following steps:

s1, a back suction process; as shown in fig. 6, the first valve body 12 is closed, the second valve body 13 is opened, the high pressure air delivery device 14 delivers compressed air to the vacuum nozzle 114, the compressed air is injected into the second laval nozzle 115 through the nozzle 1141 of the vacuum nozzle, and vacuum pressure is formed in the second mixing chamber 117; the vacuum air pressure causes the energy storage cylinder 3 and the liquid supply tank 2 to generate pressure difference, so as to push the fluid in the liquid supply tank 2 to enter a multi-section shaft hole 43 on the side connected with the energy storage cylinder 3 through a side taper hole 42 of the reversible fluid pump 4, and further pump the nuclear waste liquid to enter the energy storage cylinder 3 through the energy conversion pipeline 8, thereby realizing the conversion between air pressure energy and fluid potential energy; until the energy storage cylinder 3 is filled with nuclear waste liquid;

s2, conveying process; as shown in fig. 7, when the energy storage cylinder 3 is filled with the nuclear waste liquid, the second valve body 13 is closed, the first valve body 12 is opened, the high-pressure air delivery device 14 delivers the compressed air to the thrust nozzle 112 and generates the pulse pressure, the pulse pressure is directly injected into the first laval nozzle 113 through the nozzle 1121 of the thrust nozzle, the nuclear waste liquid in the energy storage cylinder 3 is pushed through the transduction pipeline 8 and accelerated through the multi-stage shaft hole 43 of the reversible fluid pump 4, and then is directly injected into the symmetrical multi-stage shaft hole 43' of the reversible fluid pump, and finally flows into the receiving tank 4; until the nuclear waste liquid is not stored in the energy storage cylinder 3;

s3, a buffering process; as shown in fig. 8, after the delivery process is finished, the first valve body 12 and the second valve body 13 are closed, and the pressure in the energy storage cylinder 3 is naturally discharged and released through the transduction pipeline 8, the first laval nozzle 113, the first mixing chamber 116, the connecting arm pipe 1113, the second mixing chamber 117 and the second laval nozzle 115; until the pressure in the energy storage cylinder 3 reaches balance, the liquid level in the liquid supply tank 2 is the same as the liquid level in the energy storage cylinder 3 or the liquid level in the energy conversion pipeline.

S4, circulating S1-S3.

It should be noted that the above-described embodiments may enable those skilled in the art to more fully understand the present invention, but do not limit the present invention in any way. Therefore, although the present invention has been described in detail with reference to the drawings and examples, it will be understood by those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention.