阅读说明：本技术 一种用于非能动流体输送的空气喷射器组 (Air ejector group for passive fluid delivery ) 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：本发明提出的用于非能动流体输送的空气喷射器组,采用工字型连接管连接压冲喷射器和真空喷射器,并通过所述压冲喷射器和真空喷射器的协同工作,实现非能动流体的输送,结构简单,可满足远距离操作需求,且免维修并可快速更换。(The air ejector group for passive fluid conveying adopts the I-shaped connecting pipe to connect the pressure impact ejector and the vacuum ejector, realizes the conveying of passive fluid through the cooperative work of the pressure impact ejector and the vacuum ejector, has simple structure, can meet the requirement of remote operation, is free from maintenance and can be quickly replaced.)

1. An air jet stack for passive fluid delivery comprising

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;

the pressure flushing ejector comprises a pressure flushing spray pipe, a first Laval spray pipe and a first mixing chamber, wherein the pressure flushing spray pipe is fixed on the upper side of the first arm pipe, and the first Laval spray pipe is fixed on the lower side of the first arm pipe; the nozzle of the pressure flushing spray pipe is positioned in the contraction pipe of the first Laval spray pipe and is opposite to the throat pipe of the first Laval spray pipe, and the first mixing chamber comprises a gap between the nozzle of the pressure flushing spray pipe and the contraction pipe of the first Laval spray pipe;

the vacuum ejector comprises a vacuum nozzle, a second Laval nozzle and a second mixing chamber, the vacuum nozzle is fixed on the upper side of the second arm pipe, the second Laval nozzle is fixed on the lower side of the second arm pipe, a nozzle of the vacuum nozzle is positioned in a contraction pipe of the second Laval nozzle and is opposite to a throat pipe of the second Laval nozzle, and the second mixing chamber comprises a gap between the nozzle of the vacuum nozzle and the contraction pipe of the second Laval nozzle;

the connecting arm pipe is communicated with the first mixing chamber and the second mixing chamber.

2. The air ejector cluster of claim 1, wherein the distance between the nozzle of the pressure ram and the throat of the first laval nozzle is less than the distance between the nozzle of the vacuum nozzle and the throat of the second laval nozzle.

3. The air ejector cluster of claim 1, wherein the ratio of the nozzle diameter of the pressure ram nozzle to the throat diameter of the first laval nozzle is greater than the ratio of the nozzle diameter of the vacuum nozzle to the throat diameter of the second laval nozzle.

4. The air ejector cluster of claim 1, wherein the throat diameter of the first laval nozzle is smaller than the throat diameter of the second laval nozzle.

5. The air ejector cluster of claim 1, wherein the nozzle diameter of the thrust lance is greater than the nozzle diameter of the vacuum lance.

6. The air ejector group of claim 1, wherein the ram nozzle is connected to the high-pressure air delivery device through a first valve body, and the vacuum nozzle is connected to the high-pressure air delivery 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.

7. A passive fluid delivery system, characterized in that, comprising a power control device, a fluid supply tank, a receiving tank, and an energy storage cylinder and a reversible fluid pump which are arranged in the fluid supply tank, an air ejector set of claims 1-6 is used as the power control device, the air ejector set completes the delivery of 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 hole of the reversible fluid pump by pumping air or gas insoluble in the delivered fluid into the energy storage cylinder.

Technical Field

The invention relates to the field of fluid conveying, in particular to the field of radioactive fluid conveying, and specifically relates to an air ejector set for passive fluid conveying.

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 an air ejector group for passive fluid conveying, which utilizes the Bernoulli principle and a Laval nozzle, communicates a pressure jet ejector and a vacuum ejector through an I-shaped connecting pipe, realizes the conveying of passive fluid, has simple and reliable structure, meets the requirement of remote operation, is free from maintenance and can be replaced quickly, and the treatment capacity of waste liquid cannot be increased.

The technical scheme of the invention is as follows:

an air jet stack for passive fluid delivery comprising

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;

the pressure flushing ejector comprises a pressure flushing spray pipe, a first Laval spray pipe and a first mixing chamber, wherein the pressure flushing spray pipe is fixed on the upper side of the first arm pipe, and the first Laval spray pipe is fixed on the lower side of the first arm pipe; the nozzle of the pressure flushing spray pipe is positioned in the contraction pipe of the first Laval spray pipe and is opposite to the throat pipe of the first Laval spray pipe, and the first mixing chamber comprises a gap between the nozzle of the pressure flushing spray pipe and the contraction pipe of the first Laval spray pipe;

the vacuum ejector comprises a vacuum nozzle, a second Laval nozzle and a second mixing chamber, the vacuum nozzle is fixed on the upper side of the second arm pipe, the second Laval nozzle is fixed on the lower side of the second arm pipe, a nozzle of the vacuum nozzle is positioned in a contraction pipe of the second Laval nozzle and is opposite to a throat pipe of the second Laval nozzle, and the second mixing chamber comprises a gap between the nozzle of the vacuum nozzle and the contraction pipe of the second Laval nozzle;

the connecting arm pipe is communicated with the first mixing chamber and the second mixing chamber.

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.

Preferably, the throat diameter of the first laval nozzle is smaller than the throat diameter of the second laval nozzle.

Preferably, the nozzle diameter of the pressure lance is larger than the nozzle diameter of the vacuum 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.

A passive fluid conveying system comprises a power 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 air ejector set is used as the power control device, and the air ejector set can pump air or gas insoluble in conveying fluid into the energy storage cylinder to complete the conveying of the fluid from a 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 a symmetrically-arranged multi-section shaft hole of the reversible fluid pump.

Compared with the prior art, the invention has the advantages that: the air ejector group for passive fluid conveying adopts the I-shaped connecting pipe to connect the pressure impact ejector and the vacuum ejector, realizes the conveying of passive fluid through the cooperative work of the pressure impact ejector and the vacuum ejector, has simple structure, can meet the requirement of remote operation, is free from maintenance and can be quickly replaced. When high-pressure air is input into the vacuum ejector, because the nozzle of the vacuum nozzle pipe is slightly far away from the throat pipe of the second Laval nozzle pipe, the high-pressure air enters the throat pipe of the second Laval nozzle pipe through the contraction pipe of the second Laval nozzle pipe to be accelerated and passes through the second Laval nozzle pipe at a speed close to the sonic speed or the supersonic speed, if the upper end of the pressure jet ejector is closed, the original gas in the pressure jet ejector and the connecting arm pipe is entrained into the second Laval nozzle pipe, and partial vacuum air pressure is generated, and the partial vacuum air pressure sucks fluid (such as nuclear waste liquid) into the energy storage cylinder, so that the conversion between air pressure energy and liquid potential energy is realized, namely the back suction process. When high-pressure air is input into the pressure flushing ejector and the air supply above the vacuum ejector is closed, pulse pressure is generated in the pressure flushing ejector, and due to the fact that the distance between a nozzle of the pressure flushing spray pipe and a throat pipe of the first Laval spray pipe is small, the pulse pressure directly enters the first Laval spray pipe and acts on fluid in the energy storage cylinder after being accelerated, the fluid is discharged into a receiving tank, and the conveying process is completed. 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.

Drawings

FIG. 1 is a schematic three-dimensional structure of an air jet stack for passive fluid delivery according to the present invention;

FIG. 2 is a schematic cross-sectional front view of an air jet stack for passive fluid delivery according to the present invention;

FIG. 3 is a front cross-sectional structural schematic view of a reversible fluid pump of the passive fluid delivery system;

FIG. 4 is a schematic diagram of the suck-back operation of the passive fluid delivery system;

FIG. 5 is a schematic diagram of the operation of the passive fluid delivery system during delivery;

fig. 6 is a schematic diagram of the buffering process of the passive fluid delivery system.

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, 2-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-receiving tank, 6-fluid inlet pipe, 7-fluid outlet pipe, 8-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. 1-2, which are schematic structural views of an air ejector set 11 for passive fluid delivery according to the present invention, 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.

Specifically, when high-pressure air is input into the vacuum ejector 17, because the nozzle 1141 of the vacuum nozzle and the throat 1152 of the second laval nozzle are slightly distant from each other, the high-pressure air enters the throat 1152 of the second laval nozzle through the convergent tube 1151 of the second laval nozzle to be accelerated, and passes through the second laval nozzle 115 at a speed close to a sonic speed or a supersonic speed, if the upper end of the pressure jet ejector 16 is closed, the original gas in the pressure jet ejector 16 and the connecting arm tube 1113 is entrained into the second laval nozzle 115, so as to generate a partial vacuum pressure, and the partial vacuum pressure sucks fluid (such as nuclear waste liquid) into the energy storage cylinder 3 of the passive fluid delivery system, so as to realize conversion between the gas pressure energy and liquid potential energy, that is, a suck-back process. When high-pressure air is input into the pressure impact ejector 16 and the air supply above the vacuum ejector 17 is closed, pulse pressure is generated in the pressure impact ejector 17, and due to the fact that the distance between the nozzle 1121 of the pressure impact spray pipe and the throat 1132 of the first laval spray pipe is small, the pulse pressure directly enters the first laval spray pipe 113 and acts on fluid in the energy storage cylinder 3 after being accelerated, and the fluid is discharged into the receiving tank 5, namely the conveying process. When the liquid is not stored in the energy storage cylinder 3, the air flow above the vacuum ejector 17 and the pressure jet ejector 16 is closed at the same time, and the air in the energy storage cylinder 3 is naturally exhausted and released through 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, namely, the buffering 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.

The invention discloses an air ejector group 11 for passive fluid delivery, belonging to the core component of a gas flow control device 1 in a passive fluid delivery system.

The structure and the working process of the passive fluid conveying system are schematically shown in fig. 4-6, and the passive fluid conveying system comprises a fluid supply tank 2, a receiving tank 5, an energy storage cylinder 3 and a reversible fluid pump 4, wherein the energy storage cylinder 3 and the reversible fluid pump 4 are arranged in the fluid supply tank 2; the air flow control device 1 pumps air or gas which is insoluble in the conveying fluid into the energy storage cylinder 3 to complete the conveying of the 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 of the reversible fluid pump 4.

The schematic view of the front cross-sectional structure of the reversible fluid pump 4 is shown in fig. 3, 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 diameters of the fluid inlet pipe 6 and the fluid outlet pipe 7, so as to weld the cylindrical body with the fluid inlet pipe 6 and the fluid outlet pipe 7.

The axial line of the side taper hole 42 is located on the symmetrical plane of the symmetrically arranged multi-section shaft hole 43; the small-diameter end of the side taper hole 42 is communicated with the cylindrical hole 431 through a coaxial cuboid cylindrical 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 nuclear waste liquid can be clamped to the symmetrical multi-section shaft hole 43' in the conveying process. The sum of the areas of the rectangular parallelepiped pillar holes 44 in the plurality of side cone holes 42 (the structure shown in fig. 3 is 4 side cone holes 42) is designed to be larger than the area of the large-diameter end of the spout cone hole 433 or the length of the short side of the rectangular parallelepiped pillar hole 44 is longer than the diameter of the pillar hole, so that the fluid flow in the suck-back process is ensured to be sufficient and stable.

The working process of the passive fluid conveying system is as follows:

s1, a back suction process; as shown in fig. 4, 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. 5, 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. 6, 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.

Example 2

In contrast to the exemplary embodiments described above, the air ejector group 11 for passive fluid transport according to the present invention comprises a vacuum ejector 17 and a pressure ram ejector 16. Ram injector 16 includes a ram housing, a ram nozzle 112, a first laval nozzle 113, and a first mixing chamber 116. The vacuum ejector 17 comprises a vacuum housing, a vacuum nozzle 114, a second laval nozzle 115 and a second mixing chamber 117. The pressure dashes the shell for the T type connecting pipe that first arm pipe 1111 and third arm pipe 1113 connect and form, the vacuum housing is promptly second arm pipe 1112, just the free end of third arm pipe 1113 be equipped with the butt joint's of second arm pipe 1112 side trompil connection structure, like threaded connection structure, or the free end of third arm pipe 1113 directly with second arm pipe 1112 side trompil welds mutually. Or the pressing shell is a T-shaped connecting pipe formed by connecting the first arm pipe 1111 and the third arm pipe 1113, the vacuum shell is a T-shaped connecting pipe formed by connecting the second arm pipe 1112 and the third arm pipe 1113, and the free end of the T-shaped connecting pipe is provided with a connecting structure, such as a threaded connecting structure, or the free end of the T-shaped connecting pipe is directly welded together.

The vacuum ejector 17 is configured to form a partial vacuum air pressure in the connecting arm pipe 1113, and further form a partial vacuum air pressure in the energy storage cylinder, so that the pressure at the large diameter position of the nozzle taper 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, and further the nuclear waste liquid in the liquid supply tank 2 enters the multi-section 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.

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.