Patent Publication Number: US-2023158534-A1

Title: Self-cleaning negative-pressure ejector

Description:
BACKGROUND OF THE INVENTION 
     1. Field of Invention 
     The invention relates to a microbubble generating device, and more particularly to a negative-pressure device for treating the mixing of liquid and gas and removing solid dust in order to prevent blockage of conveying pipes. 
     2. Description of the Related Art 
     Process waste gas such as industrial waste gas is generally considered to be the source of various environmental problems. Wet washing towers or scrubbers are often used to trap harmful gases from industrial process waste gas, so the degree of mixing of gas and liquid determines the decontamination ability. In order to increase the degree of mixing, wet scrubbers are divided into spray type, packed tower type, and venturi tube type. Among them, the venturi tube uses the principle of siphon to generate negative pressure to prevent the backflow of harmful gases. Taiwan&#39;s utility patent No. M535595 “Delivery tube assembly and gas-liquid mixing stirrer having the same” uses the venturi tube structure to increase the degree of mixing gas with liquid, and uses the flexible tube to prevent blocking by disturbing the solid dust attached on the delivery tube as the water flows. However, the flexible tube will often be broken during the long time usage to cause equipment damage, and the decontamination ability will decrease due to the tube wall being too small and the path being too long. Moreover, this conventional technology will not be able to treat waste gas during maintenance, so it must be shut down for maintenance, which will inevitably lead to the shutdown of the overall manufacturing process. In addition, it may be necessary to have multiple sets of spare equipment, so not only the overall cost will increase, but also the complexity of waste gas treatment will increase. 
     SUMMARY OF THE INVENTION 
     In view of the above, an object of the invention is to provide a self-cleaning negative-pressure ejector to solve the above-mentioned problems of the prior art. 
     In order to achieve the foregoing object, the invention discloses a self-cleaning negative-pressure ejector comprising: a suction chamber, a side wall of the suction chamber having at least one suction port, the suction port being used for communicating with a first fluid pipeline; a jet pipe, an exit port of the jet pipe being disposed in the suction chamber and ejecting a second fluid so that a negative pressure being generated in the suction chamber, and a first fluid in the first fluid pipeline entering the suction chamber, wherein a first included angle is between a direction in which the first fluid being sucked into the suction chamber and an ejection direction of the second fluid; and at least one flushing member used for continuously providing a third fluid to clean the suction chamber and the first fluid pipeline to generate a fixed flushing pressure or intermittently providing the third fluid to clean the suction chamber and the first fluid pipeline to generate a pulsed flushing pressure according to a numerical value of the negative pressure, a time setting or a frequency setting for removing solid particles deposited in the suction chamber and the first fluid pipeline. 
     Preferably, the third fluid is a gas, a liquid or the gas mixing with the liquid. 
     Preferably, the third fluid is a liquid and a gas supplied in sequence to remove solid particles deposited in the suction chamber and the first fluid pipeline, and remove a liquid remaining in the suction chamber when the flushing member cleans the suction chamber. 
     Preferably, the first included angle is 90 degrees. 
     Preferably, the flushing member supplies the third fluid into the first fluid pipeline and/or the suction chamber in a direction at a second included angle relative to a direction in which the first fluid is sucked into the suction chamber, the second included angle is between 90 degrees and 180 degrees. 
     Preferably, a numerical ratio of a first distance between the exit port of the jet pipe and a discharge port of the suction chamber to a second distance between the exit port of the jet pipe and the suction port of the suction chamber is between 0.5 and 2.5. 
     Preferably, the self-cleaning negative-pressure ejector of the invention further comprises a mixing pipe communicated with the suction chamber for mixing the first fluid with the second fluid to produce a mixed fluid; and a diffusion pipe communicated with the mixing pipe for spraying the mixed fluid. 
     Preferably, a quantity of the at least one flushing member is more than one, and some or all of the flushing members communicate with one another in series, in parallel, or do not communicate with one another. 
     Preferably, the flushing member is fixedly disposed on the suction chamber and the first fluid pipeline to inject the third fluid into the suction chamber and the first fluid pipeline for removing solid particles deposited in the suction chamber and the first fluid pipeline. 
     Preferably, the flushing member is movably disposed on the suction chamber and the first fluid pipeline via a movable sleeve member to movably inject the third fluid into the suction chamber and the first fluid pipeline for removing solid particles deposited in the suction chamber and the first fluid pipeline. 
     Preferably, the movable sleeve member is a rotary socket tube or a flexible sleeve connector. 
     Preferably, the movable sleeve member and/or the suction chamber is provided with a vibrator. 
     Preferably, the vibrator is operated continuously or at a predetermined time or at a predetermined frequency or operated when the negative pressure is dropped below a preset value. 
     Preferably, the suction chamber is provided with a vibrator, and the vibrator is operated continuously or at a predetermined time or at a predetermined frequency or operated when the negative pressure is dropped below a preset value. 
     Preferably, the movable sleeve member is operated according to the numerical value of the negative pressure, the time setting, or the frequency setting. 
     Preferably, the suction chamber has a bottom plate rotatably disposed on a bottom of the suction chamber, and at least one fin is disposed on the bottom plate for removing solid particles deposited in the suction chamber and the first fluid pipeline during the rotation of the fin. 
     Preferably, a height and a position of the fin correspond to the flushing member such that the fin can be rotated by the third fluid ejected out from the flushing member. 
     Preferably, the bottom plate communicates with a mixing pipe, and at least another fin is disposed on the mixing pipe such that the fin can be rotated by the second fluid ejected out from the jet pipe. 
     Preferably, the suction chamber has a bottom plate fixedly disposed on a bottom of the suction chamber, and at least one fin is rotatably disposed on the bottom plate. 
     Preferably, a height and a position of the fin correspond to the flushing member such that the fin can be rotated by the third fluid ejected out from the flushing member 
     In summary, according to the self-cleaning negative-pressure ejector of the invention, one or more of the following advantages can be provided: (1) Capable of generating high negative pressure to suck gas and solving the problem of blockage of solid particles in the fluid pipelines. (2) Having a self-cleaning function capable of performing detersive operation of automatic dust cleaning under a non-stop operation state of the whole equipment. (3) Capable of self-clearing solid blockage on the pipe walls of the negative-pressure ejector and the first fluid pipeline by using gas and/or liquid jets. (4) A direction in which the first fluid being sucked is inclined relative to an ejection direction of the second fluid, thereby capable of preventing solid particles from depositing in the first fluid pipeline. (5) Capable of removing water vapor remaining in the first fluid pipeline during a flushing process and preventing solid particles from depositing by ejecting a third fluid into the first fluid pipeline. (6) A length of the suction chamber can be extended to reduce a frequency of engineering staff cleaning the suction chamber manually. (7) The entire device of the negative-pressure ejector has no consumables, no risk of breakage, has long service life and the components can be replaced conveniently. 
     In order to enable the examiner to have a further understanding and recognition of the technical features of the invention and the technical efficacies that can be achieved, preferred embodiments in conjunction with detailed explanation are provided as follows. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a perspective view of a self-cleaning negative-pressure ejector of the invention; 
         FIG.  2 A  is a side view of the self-cleaning negative-pressure ejector of the invention, wherein a second fluid pipeline is also drawn; 
         FIG.  2 B  is a side view of the self-cleaning negative-pressure ejector of the invention, wherein the second fluid pipeline is also drawn, and a length of a suction chamber is increased; 
         FIG.  3    is a top view of the self-cleaning negative-pressure ejector of the invention; 
         FIG.  4    is a cross-sectional side view of the self-cleaning negative-pressure ejector of the invention viewed from one direction, wherein the negative-pressure ejector is an assembly structure; 
         FIG.  5    is a cross-sectional side view of the self-cleaning negative-pressure ejector of the invention viewed from another direction, wherein the negative-pressure ejector is an assembly structure; 
         FIG.  6    is a perspective view of the self-cleaning negative-pressure ejector of the invention, wherein the negative-pressure ejector is an integrated structure; 
         FIG.  7    is a cross-sectional side view of the self-cleaning negative-pressure ejector of the invention, wherein the negative-pressure ejector is an integrated structure; 
         FIG.  8 A  is a side view of the self-cleaning negative-pressure ejector of the invention, wherein a flushing member is of an movable design; 
         FIG.  8 B  is a side view of the self-cleaning negative-pressure ejector of the invention, wherein the flushing members are of another movable design; 
         FIG.  9    is a cross-sectional side view of the self-cleaning negative-pressure ejector of the invention showing a schematic diagram of an automatic rotation design; 
         FIG.  10    is a cross-sectional side view of the self-cleaning negative-pressure ejector of the invention showing a schematic diagram of another automatic rotation design; 
         FIG.  11    is a cross-sectional side view of the self-cleaning negative-pressure ejector of the invention showing a schematic diagram of vibration design; and 
         FIG.  12    is a schematic diagram of the self-cleaning negative-pressure ejector of the invention applied to an exhaust gas treatment device. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     In order to understand the technical features, content and advantages of the invention and its achievable efficacies, the invention is described below in detail in conjunction with the figures, and in the form of embodiments, the figures used herein are only for a purpose of schematically supplementing the specification, and may not be true proportions and precise configurations after implementation of the invention; and therefore, relationship between the proportions and configurations of the attached figures should not be interpreted to limit the scope of the claims of the invention in actual implementation. In addition, in order to facilitate understanding, the same elements in the following embodiments are indicated by the same referenced numbers. And the size and proportions of the components shown in the drawings are for the purpose of explaining the components and their structures only and are not intending to be limiting. 
     Unless otherwise noted, all terms used in the whole descriptions and claims shall have their common meaning in the related field in the descriptions disclosed herein and in other special descriptions. Some terms used to describe in the present invention will be defined below or in other parts of the descriptions as an extra guidance for those skilled in the art to understand the descriptions of the present invention. 
     The terms such as “first”, “second”, “third” used in the descriptions are not indicating an order or sequence, and are not intending to limit the scope of the present invention. They are used only for differentiation of components or operations described by the same terms. 
     Moreover, the terms “comprising”, “including”, “having”, and “with” used in the descriptions are all open terms and have the meaning of “comprising but not limited to”. 
     A self-cleaning negative-pressure ejector  10  of the invention is not only capable of generating high negative pressure and sucking gas, solving the problem of blockage of solid particles in a fluid pipeline, but also capable of providing a self-cleaning function to avoid the problem of blockage of solid particles caused by long time usage of a suction chamber  20  of the negative-pressure ejector  10 . In addition, if a mixed fluid ejected by the negative-pressure ejector  10  of the invention is applied to a processing tank with fluid, gas solubility and solid particle capture rate can be increased by generating microbubbles with a greatly increased surface area per unit volume (surface area divided by volume). 
     Please refer to  FIGS.  1  to  11   , the self-cleaning negative-pressure ejector  10  of the invention at least comprises the suction chamber  20  and a jet pipe  30 . A side wall  22  of the suction chamber  20  has at least one suction port  24 , and the suction port  24  is used to communicate with a first fluid pipeline  40 . Wherein the suction chamber  20  is preferably a hollow columnar pipe, and preferably a cylindrical pipe, but the suction chamber  20  is not limited thereto, and other shapes are also applicable to the invention. The jet pipe  30  is preferably a hollow funnel pipe, that is, a structure of the jet pipe  30  is wide at top and narrow at bottom to speed up a flow rate. Opening diameters of openings on two sides of the jet pipe  30  are different, and an opening diameter of an entrance port  32  is preferably larger than an opening diameter of an exit port  34 , wherein a pipe wall between the entrance port  32  and the exit port  34  of the jet pipe  30  can be inclined, or can be inclined after extending in parallel, and an inclination angle depends on a distance and an opening diameter between the entrance port  32  and the exit port  34  of the jet pipe  30 . A top side of the suction chamber  20  is preferably closed, and a bottom side of the suction chamber  20  has a discharge port  26 . 
     A top end of the jet pipe  30  is the entrance port  32 , and a bottom end of the jet pipe  30  is the exit port  34 . A body of the jet pipe  30  is partially or completely penetrated in the suction chamber  20 , so that the exit port  34  of the jet pipe  30  is disposed in the suction chamber  20 , and the entrance port  32  of the jet pipe  30  is communicated with a second fluid pipeline  42  capable of providing a second fluid  200 . Therefore, when the second fluid  200  enters the suction chamber  20  from the entrance port  32  of the jet pipe  30  and is ejected from the exit port  34 , high flow rate of the second fluid  200  will cause the suction chamber  20  to generate a negative pressure. A numerical value of the negative pressure is, for example, but not limited to, 0 kPa to −100 kPa. By means of a suction force of the vacuum negative pressure phenomenon or a pressure (such as gas pressure) of a first fluid  100  flowing in the first fluid pipeline  40 , the first fluid  100  in the first fluid pipeline  40  is capable of entering into the suction chamber  20 , and preferably being sucked into the suction chamber  20  perpendicularly or obliquely, so as to avoid deposition of solid particles in the first fluid pipeline  40 . One feature of the invention is that a first included angle θ 1  is between a direction in which the first fluid  100  being sucked by the negative pressure and enters the suction chamber  20  and an ejection direction of the second fluid  200 , wherein the first included angle θ 1  is, for example, 90 degrees. However, in other example, the first included angle θ 1  may be less than 90 degrees, namely the first fluid  100  may be sucked by the negative pressure and obliquely enters the suction chamber  20 . 
     The design of the invention is capable of speeding up a flow rate to cause the surrounding environment to generate vacuum negative pressure phenomenon to suck out the first fluid  100  (such as process exhaust gas and other gases) in the first fluid pipeline  40 , and preventing solid particles from accumulating at an exit of the first fluid pipeline  40 . A first distance between the exit port  34  of the jet pipe  30  and the discharge port  26  of the suction chamber  20  is, for example, equal to a second distance between the exit port  34  of the jet pipe  30  and the suction port  24  of the suction chamber  20 , so as to obtain better ejection effect, but is not limited thereto. For example, the first distance can also be greater or less than the second distance. In addition, the first fluid  100  can be a gas or a liquid, and the second fluid  200  can be a liquid or a gas. Taking the treatment of process waste gas as an example, the first fluid  100  is preferably a gas such as process waste gas, and the second fluid  200  is preferably a liquid such as water or washing liquid corresponding to the process waste gas. A flow rate of the first fluid  100  ranges from about 200 SLM to 4000 SLM, and a diameter of the first fluid pipeline  40  ranges from about 10 cm to 250 cm. A flow rate of the second fluid  200  ranges from about 200 SLM to 4,000 SLM, and a diameter of the second fluid pipeline  42  ranges from about 10 cm to 250 cm. In addition, the suction chamber  20  of the negative-pressure ejector  10  of the invention can be lengthened (that is, by increasing the first distance between the exit port  34  of the jet pipe  30  and the discharge port  26  of the suction chamber  20 ) to reduce a frequency of engineering staff cleaning the suction chamber  20  manually. In other words, the longer the first distance between the exit port  34  of the jet pipe  30  and the discharge port  26  of the suction chamber  20 , the longer a time interval of engineering staff cleaning the suction chamber  20  manually. For example, a numerical ratio of the first distance to the second distance can be, for example, between 0.5 and 2.5, preferably between 1 and 2.5 or between 0.5 and 1, more preferably 0.86. 
     The self-cleaning negative-pressure ejector  10  of the invention further optionally comprises a mixing pipe  60 , wherein an inlet end of the mixing pipe  60  communicates with the suction chamber  20 . In detail, the inlet end of the mixing pipe  60  is preferably communicated with the discharge port  26  of the suction chamber  20 . Therefore, when the first fluid  100  and the second fluid  200  enter the suction chamber  20  through the first fluid pipeline  40  and the jet pipe  30  respectively, and enter the mixing pipe  60  from the discharge port  26  of the suction chamber  20 , the mixing pipe  60  is capable of mixing the first fluid  100  with the second fluid  200  to produce a mixed fluid  400 . Wherein, the mixed fluid  400  preferably has microbubbles so as to achieve a detersive efficacy. The mixing pipe  60  is, for example, a hollow columnar pipe, and preferably a cylindrical pipe, but is not limited thereto, and other shapes are also applicable to the invention. The mixing pipe  60  is preferably a straight pipe, that is, a pipe diameter of the mixing pipe  60  is preferably substantially the same. However, other shapes and forms of the mixing pipe  60  are also applicable to the invention. A length of the mixing pipe  60  can be adjusted according to actual requirements to achieve different mixing effects. 
     The mixing pipe  60  of the invention can be directly connected to the suction chamber  20 . In addition, the mixing pipe  60  can also be indirectly connected to the suction chamber  20 . For example, a fixing sleeve  21  can optionally be provided between the mixing pipe  60  and the suction chamber  20  to sleevely connect the mixing pipe  60  with the suction chamber  20  and/or increase a structural stability. For example, the bottom side of the suction chamber  20  of the invention can be a bottom plate  23  with the discharge port  26 , and the bottom plate  23  can be detachably connected with the side wall  22  or integrally formed with the side wall  22 . The mixing pipe  60  can communicate with the suction chamber  20  via the fixing sleeve  21 , for example. Alternatively, the bottom side of the suction chamber  20  can also be formed by the fixing sleeve  21 , wherein a top end of the fixing sleeve  21  is connected to a bottom end of the suction chamber  20 , and a bottom end of the fixing sleeve  21  is connected to the mixing pipe  60 , so that the mixing pipe  60  communicates with the suction chamber  20  via the fixing sleeve  21 . However, the above structure is only an example, and is not intended to limit the invention. 
     In addition, please refer to  FIGS.  9  to  10   , in another embodiment, the suction chamber  20  of the invention can optionally have a manual removal structure or a self-rotating removal structure to remove deposited solid particles and prevent the solid particles from depositing continuously. Taking the manual removal structure as an example, the bottom plate  23  of the discharge port  26  of the invention is sealed and rotatably disposed on the bottom side of the suction chamber  20 , and a top side of the bottom plate  23  has one fin  23   a  or a plurality of fins  23   a , thereby, a user can manually rotate the mixing pipe  60  to rotate the bottom plate  23 , and then use the fin  23   a  to remove and prevent solid particles from depositing in the suction chamber  20 . Taking the self-rotating removal structure as an example, the bottom plate  23  with the discharge port  26  of the invention is sealed and rotatably disposed on the bottom side of the suction chamber  20 , the top side of the bottom plate  23  has one fin  23   a  or a plurality of fins  23   a , the mixing pipe  60  and/or the bottom plate  23  have/has a design that can be automatically rotated by the flow of the second fluid  200  and/or the third fluid  300 , and then the rotating fins  23   a  are used to remove and prevent solid particles from depositing in the suction chamber  20 . Preferably, as shown in  FIG.  9   , the automatic rotation design can be achieved by the fins  23   a  fixedly disposed on the bottom plate  23 . For example, position and height of the fins  23   a  are preferably disposed corresponding to position and height of a flushing member  50 . When the flushing member  50  ejects the third fluid  300 , the third fluid  300  is capable of impacting the fins  23   a  to drive the bottom plate  23  to rotate, that is, the fins  23   a  can rotate with the bottom plate  23  in the suction chamber  20 , thereby effectively and automatically preventing solid particles from depositing in the suction chamber  20 . Or, as shown in  FIG.  10   , this automatic rotation design can be achieved, for example, by optionally distributing a plurality of fins  23   b  on an inner wall of the mixing pipe  60 , thereby when the second fluid  200  is injected into the mixing pipe  60 , part of the second fluid  200  can flow along the fins  23   b  to drive the mixing pipe  60  to rotate, and then drive the bottom plate  23  and the fins  23   a  thereon to rotate. Or, taking the self-rotating removal structure as an example, the bottom plate  23  with the discharge port  26  of the invention is sealed and fixedly disposed on the bottom side of the suction chamber  20 , and one fin  23   a  or a plurality of fins  23   a  has/have a rotating shaft and is/are disposed on the bottom plate  23  so that the fins  23   a  can be rotatably disposed on the bottom plate  23 , wherein position and height of the fins  23   a  are preferably disposed corresponding to position and height of the flushing member  50  (as shown in  FIG.  9   ), when the flushing member  50  ejects the third fluid  300 , the third fluid  300  is capable of impacting the fins  23   a  to drive the fins  23   a  to rotate, thereby preventing solid particles from depositing or stripping off the deposited solid particles. A shape of the fin  23   a  can be, for example, a linear shape or an arcuate shape, as shown in  FIGS.  9  and  10   . However, the shape and a quantity of the fin  23   a  are not particularly limited, as long as the fin  23   a  can be pushed by the impact of the fluid or the bottom plate  23  can be driven to rotate to prevent solid particles from depositing or strip off the deposited solid particles, any shape or structure of the fin  23   a  can be applied to the invention. 
     The self-cleaning negative-pressure ejector  10  of the invention further optionally comprises a diffusion pipe  70 , wherein an inlet end of the diffusion pipe  70  communicates with an outlet end of the mixing pipe  60 . The diffusion pipe  70  is preferably a hollow pipe, and preferably a divergent funnel pipe, that is, the diffusion pipe  70  has a structure with a narrow top and a wide bottom. Openings at two sides of the diffusion pipe  70  have different diameters, and preferably a diameter of the inlet end of the diffusion pipe  70  is smaller than a diameter of an outlet end of the diffusion pipe  70 , wherein a pipe wall between the inlet end and the outlet end of the diffusion pipe  70  is preferably inclined, that is, the diameter is gradually changed, or the pipe wall is inclined after extending in parallel, and an inclination angle can be adjusted according to actual requirements to achieve different diffusion effects. All or part of material of an overall structure or one or more than one component of the negative-pressure ejector  10  of the invention can be, for example, but not limited to, polyvinyl chloride (PVC), chlorinated polyvinyl chloride (CPVC), stainless steel, such as SUS304 or SUS316 stainless steel and its Teflon (PTFE) coating layer. Wherein a structure of the suction chamber  20  can be completely or partially transparent, or the structure of the suction chamber  20  can be completely or partially opaque. If the suction chamber  20  has a transparent structure, it is helpful for the user to visually observe whether there is a blockage. 
     The diffusion pipe  70  of the invention can be directly connected to the mixing pipe  60 . In addition, the diffusion pipe  70  can also be indirectly connected to the mixing pipe  60 . For example, a fixing sleeve  71  can optionally be provided between the diffusion pipe  70  and the mixing pipe  60  to increase a structural stability. Wherein one end of the fixing sleeve  71  is connected to the mixing pipe  60  and another end thereof is connected to the diffusion pipe  70 , or the fixing sleeve  71  is located at a junction between the diffusion pipe  70  and the mixing pipe  60 . However, the above structure is only an example, and is not intended to limit the invention. In addition, the negative-pressure ejector  10  of the invention can be an integrated or a combinational structure, wherein the suction chamber  20 , the jet pipe  30 , the mixing pipe  60  and/or the diffusion pipe  70  are an integrated or a combinational structure. Taking the diffusion pipe  70  with a combinational structure as an example, the diffusion pipe  70  of the invention can be formed by connecting two pipes or more than two pipes. However, the above structure is only an example, and is not intended to limit the invention. 
     Another technical feature of the invention is that the self-cleaning negative-pressure ejector  10  of the invention further comprises at least one flushing member  50 . The flushing member  50  is preferably directly or indirectly connected to a third fluid pipeline  44  to communicate with the third fluid pipeline  44 , wherein another side of the third fluid pipeline  44  is, for example, communicated with a third fluid supply tank (not shown in the figures) to supply the third fluid  300  into the suction chamber  20  and/or the first fluid pipeline  40 . Since the second fluid  200  is ejected from the exit port  34  at the bottom end of the jet pipe  30  and enters the mixing pipe  60 , solid particles may be deposited below and/or even above the exit port  34  to cause blockage, so a preferred disposing position of the flushing member  50  is located above the exit port  34  of the jet pipe  30 , and more preferably located between a top end of the suction chamber  20  and the exit port  34  of the jet pipe  30 , thereby achieving an efficacy of keeping the negative-pressure ejector  10  clean by removing solid particles deposited on the negative-pressure ejector  10  or preventing solid particles from depositing on the negative-pressure ejector  10 . However, a disposing position of the flushing member  50  is only an example, and is not intended to limit the invention. For example, in other embodiment, the flushing member  50  can be located below the exit port  34  of the jet pipe  30 . 
     In addition, the flushing member  50  or the third fluid pipeline  44 , for example, can be controlled by a control component (not shown in the figures), so that the third fluid pipeline  44  can supply or stop supplying the third fluid  300  via the flushing member  50 . The control component can be, for example, but is not limited to, a controller with a water pump or an electric control valve. The control component can adopt the existing technology, so it will not be described herein. A type of the flushing member  50  is not particularly limited, as long as the flushing member  50  is capable of ejecting a single liquid column or a plurality of liquid columns, it can be applied to the invention. 
     For example, the flushing member  50  can be, for example, a spray head, a nozzle, a pipe, an opening, or other suitable cleaning elements, as long as the flushing member  50  of the invention is capable of optionally ejecting the third fluid  300  to flush the suction chamber  20  and/or the first fluid pipeline  40 , it is applicable to the invention. The flushing member  50  preferably ejects the third fluid  300  horizontally, that is, the third fluid  300  is preferably substantially perpendicular to a direction in which the second fluid  200  enters the suction chamber  20  to be capable of achieving better flushing and cleaning efficacies, but it is not limited thereto, the third fluid  300  can also be inclined toward the suction port  24  of the suction chamber  20  and/or the discharge port  26  of the suction chamber  20 , or even be parallel to a direction in which the second fluid  200  enters the suction chamber  20 , as long as blockage caused by solid particles can be effectively removed, it can be applied to the invention. The above is only examples and is not intended to limit the invention, that is, various flushing methods and designs belong to the scope of the invention. 
     In addition, the flushing member  50 , for example, can be provided on the suction chamber  20 , or can be provided on the first fluid pipeline  40 , or can be provided on the suction chamber  20  and the first fluid pipeline  40  at the same time. Alternatively, the flushing member  50  can also be provided on the jet pipe  30  or the first fluid pipeline  40 , in this case the third fluid  300  can be supplied by the third fluid pipeline  44  or by the jet pipe  30  or by the first fluid pipeline  40 . Alternatively, the flushing member  50  can also be disposed at any position on the negative-pressure ejector  10  or even be disposed at a distance from the suction chamber  20 . In other words, any structure, any type, any disposing position, or any quantity of the flushing member  50  can be applicable to the invention, as long as the flushing member  50  is capable of optionally ejecting the third fluid  300  to flush the suction chamber  20  and/or the first fluid pipeline  40 . In addition, material and supply source of the third fluid  300  can be the same as or different from that of the second fluid  200 . 
     A quantity of the flushing member  50  can be determined according to actual requirements, and can be one or more than one. If a quantity of the flushing member  50  is more than one, the flushing members  50 , for example, can be distributed on a same horizontal plane (single-layer distribution) or on different horizontal planes (multi-layer distribution), or distributed at equal angles, thereby the third fluid  300  is ejected at equal angles. Taking a quantity of the flushing member  50  as three as an example, an included angle between the three flushing members  50  is preferably 120 degrees. In a similar way, the flushing members  50  of the invention are not limited to equiangular distribution, and the flushing members  50  can also be distributed at non-equal angles. Taking a quantity of the flushing member  50  as three as an example, the three flushing members  50  are preferably disposed in such a way that two of the flushing members  50  are located in the suction chamber  20 , and one of the flushing members  50  is located on the first fluid pipeline  40 . If the first fluid pipeline  40  has a place where solid particles can be deposited, such as a bend, the flushing member  50  is preferably located on the bend of the first fluid pipeline  40 . In addition, in the invention, some or all of the flushing members  50  can be communicated with one another in series or in parallel via the third fluid pipeline  44  or other pipelines, or some or all of the flushing members  50  can also operate independently without being communicated with one another. 
     For example, the flushing members  50  can be commercially available three-way joints or three-way valves, or can be sequentially communicated with the third fluid pipeline  44  via a commercially available three-way joint or three-way valve, thereby the third fluid  300  supplied by the third fluid pipeline  44  can be ejected from the flushing members  50  at the same time or sequentially at a high speed toward a position in the suction chamber  20  and/or the first fluid pipeline  40  that may be or has been blocked. Moreover, a way in which the third fluid pipeline  44  supplies the third fluid  300  to the flushing members  50  can be based on a numerical value of the negative pressure, for example, determining whether a numerical value of the negative pressure exceeds a predetermined numerical value range, and/or based on time setting and/or frequency setting, such as fixed timing/fixed frequency, to be manually controlled or automatically controlled. Taking determining a numerical value as an example, the negative-pressure ejector  10  of the invention can be further provided with a pressure sensor (not shown in the figures), preferably disposing on the suction chamber  20  or the first fluid pipeline  40 , thereby sensing a numerical value of the negative pressure, so that the user is capable of operating manually. Alternatively, the control component can also determine whether a numerical value of the negative pressure is within a predetermined numerical value range; if the result is no, the third fluid  300  is automatically supplied to clear blockage caused by solid particles. Since a person having ordinary skill in the art to which the invention pertains, based on the disclosure of the invention, should be able to understand how to control the flushing member  50  to produce a flushing effect, so it will not be described herein. In short, the flushing member  50  of the invention can adopt any existing structure or technology to achieve an efficacy of cleaning, preventing or removing solid blockage. 
     Another technical feature of the invention is that the flushing member  50  is capable of ejecting the third fluid  300  to achieve a self-cleaning efficacy when the suction chamber  20  substantially has a negative pressure, that is, the self-cleaning negative-pressure ejector  10  of the invention is capable of performing detersive operation of automatic dust cleaning under a non-stop operation state of the whole equipment, and substantially maintaining the jet pipe  10  in a negative-pressure state. However, the invention is also not limited to the above method, the self-cleaning negative-pressure ejector  10  of the invention is also capable of ejecting the third fluid  300  when the suction chamber  20  does not have a negative pressure substantially according to actual requirements, that is, performing detersive operation of automatic dust cleaning when operation of the whole equipment is shut down. 
     In addition, another technical feature of the invention is that one flushing member  50  or a plurality of flushing member  50  can be provided on the first fluid pipeline  40  and/or the suction chamber  20 , a jetting direction of the flushing member  50  is, for example, a fixed type or a movable type, and for example, to continuously inject third fluid  300  into the first fluid pipeline  40  and/or the suction chamber  20  to generate a fixed jet pressure, or to inject the third fluid  300  into the first fluid pipeline  40  and/or the suction chamber  20  intermittently to generate a pulsed jet pressure. The third fluid  300  can be liquid, gas, and preferably liquid and gas in sequence. For example, taking the fixed arrangement as an example, the flushing member  50 , for example, can be directly disposed on the first fluid pipeline  40  and/or the suction chamber  20 , so that a jetting direction thereof is fixed. Or, taking the movable arrangement as an example, via a movable sleeve member  520  provided on the first fluid pipeline  40 , such as a rotary socket tube (as shown in  FIG.  8 A ) or a flexible sleeve connector  530  (as shown in  FIG.  7   ), direction or angle of third fluid  300  injected by the flushing member  50  into the first fluid pipeline  40  can be adjusted in a movable manner. In addition, the flushing member  50  can also be provided on the first fluid pipeline  40  and/or the suction chamber  20  via the movable sleeve member  520  optionally, such as a rotary socket tube or a flexible sleeve connector (as shown in  FIGS.  8 A and  8 B  respectively). For the same reason, via the movable sleeve member  520  provided on the suction chamber  20  optionally, such as a rotary socket tube or a flexible sleeve connector, direction or angle of fluid injected by the flushing member  50  into the suction chamber  20  can be adjusted in a movable manner. Wherein, the flushing member  50  supplies the third fluid  300  into the first fluid pipeline  40  and/or the suction chamber  20  in a direction at a second included angle θ 2  relative to a direction in which the first fluid  100  is sucked into the suction chamber  20 . The second included angle θ 2  is, for example, between 90 degrees and 180 degrees, preferably between 120 degrees and 180 degrees, and more preferably between 150 degrees and 180 degrees. In addition, the flushing member  50  preferably injects the third fluid  300  into the first fluid pipeline  40  along the center of the first fluid pipeline  40 , and the flushing member  50  preferably injects the third fluid  300  into the first fluid pipeline  40  continuously. The gas of the third fluid  300  ejected through the flushing member  50  can be, for example, nitrogen gas or heated nitrogen gas. A flow rate of the third fluid  300  is, for example, between 0 SLM and 500 SLM, preferably between 0 SLM and 200 SLM, and more preferably between 0 SLM and 60 SLM. Taking the movable sleeve member  520  as a rotary socket tube as an example, the movable sleeve member  520 , for example, can be rotatably provided on the first fluid pipeline  40  ( FIG.  8 A ) and/or the suction chamber  20  ( FIG.  8 B ), so that the flushing member  50  is capable of swinging back and forth around the first fluid pipeline  40  and/or the suction chamber  20  to change direction or angle. For example, an outer side of the rotary socket tube can have a gear, wherein the gear meshes with another gear on a driving motor, and the other gear is connected to a rotating shaft of the driving motor. When a negative pressure of the suction chamber  20  decreases, for example, dropping below a preset value, the rotating shaft of the driving motor is capable of rotating back and forth, thereby causing the rotary socket tube to swing back and forth to make a fluid ejected by the flushing member  50  to be more fully in contact with a pipe wall, which is capable of effectively removing deposition of solid particles and keeping the pipe wall dry. In addition, the rotary socket tube can also be operated at a predetermined time or at a predetermined frequency, for example, according to a time setting or a frequency setting. For example, taking the movable sleeve member  520  as a flexible sleeve connector as an example, the movable sleeve member  520 , for example, can be a soft sealing ring with a perforation, wherein the soft sealing ring is connected to a pipe wall hole and the perforation is sleeved with the flushing member  50 , thereby the user can hold the flushing member  50  to adjust direction or angle of the third fluid  300  injected into the first fluid pipeline  40  and/or the suction chamber  20 . Alternatively, the movable sleeve member  520  such as the flexible sleeve connector or the rotary socket tube, and/or the suction chamber  20  can also be provided with a vibrator  540  (as shown in  FIG.  11   ), for example, when a negative pressure of the suction chamber  20  decreases, for example, dropping below a preset value, the vibrator  540  can be operated to cause the flexible sleeve connector and the flushing member  50  sleeved with the flexible sleeve connector and/or the suction chamber  20  to produce vibration, thereby causing a fluid ejected by the flushing member  50  due to vibration to be more fully in contact with the pipe wall, which is capable of effectively removing deposition of solid particles and keeping the pipe wall dry. In addition, the vibrator of the flexible sleeve connector can also be operated continuously or at a predetermined time or at a predetermined frequency, for example, according to a time setting or a frequency setting. 
     For example, the flushing member  50  can be a commercially available three-way joint or three-way valve. If a quantity of the flushing member  50  is more than one, the flushing member  50  can be sequentially communicated with a third fluid pipeline  44  via a commercially available three-way joint or three-way valve, thereby the gas of the third fluid  300  supplied by the third fluid pipeline  44  can be injected into the first fluid pipeline  40  at a high speed by the flushing member  50 , thereby removing water vapor remaining in the first fluid pipeline  40  by the flushing member  50  during a flushing process, and preventing solid particles from depositing. In addition, the flushing member  50 , for example, can be disposed at different heights of the first fluid pipeline  40 , and for example, are disposed around the first fluid pipeline  40 . 
     Taking treatment of process waste gas as an example, the first fluid  100  is preferably a gas, such as an exhaust gas of tail gases, and is, for example, a process waste gas generated in a semiconductor manufacturing process, and the second fluid  200  is preferably a liquid, such as liquid water, water-containing solution, or other washing liquids, such as alkaline solutions. For example, a washing liquid composed of fresh water is effectively sufficient to be applied to capture dusts or solid particles, wherein an aqueous solution of washing liquid is capable of moistening and capturing dusts or particles. In addition, a washing liquid composed of fresh water and sodium hydroxide or other neutralizers (such as lime) is capable of effectively extracting and neutralizing a large amount of acidic substances, such as hydrochloric acid, sulfuric acid or other acid-containing components in a waste gas. Since acidic substances such as hydrochloric acid and sulfuric acid dissolve in water very easily, if there is a suitable alkali in a washing liquid composed of water, such as calcium hydroxide (Ca(OH) 2 ), calcium carbonate (CaCO 3 ), and/or sodium bicarbonate (NaHCO 3 ) capable of dissolving in water, acidic components in various production sources can be absorbed and neutralized to reduce the formation of acidic solutions. 
     If the self-cleaning negative-pressure ejector  10  of the invention is disposed in a processing tank  80  (as shown in  FIG.  12   ) to form an exhaust gas processing device, a composition of the second fluid  200  is preferably determined based on the to-be-treated first fluid  100  (e.g. gas), the second fluid  200  (e.g. liquid) is preferably contained in the processing tank  80 , and is cyclically supplied to the jet pipe  30  via a pipeline for ejection from the exit port  34 , with the first fluid  100  (gas) in the first fluid pipeline  40  being sucked by a high negative pressure generated by the principle of a venturi tube, a water-gas mixed fluid is formed. When the water-gas mixed fluid enters the mixing pipe  60 , the diffusion pipe  70  or the second fluid  200  in the processing tank  80 , the first fluid  100  (gas) will be cut into microbubbles due to pressure changes, and movement is linear with high energy efficiency. In addition, since the self-cleaning negative-pressure ejector  10  of the invention is capable of performing detersive operation of automatic dust cleaning under a non-stop operation state of the whole equipment, that is, the invention is capable of maintaining a negative-pressure value in real time, and capable of keeping a motor power low with less exhaust gas in real time. Therefore, taking PM2.5 microparticle as an example, the invention is capable of maintaining a 97% removal rate in real time, and has an energy-saving effect. 
     In various embodiments of the invention, the third fluid  300  can be, for example, a continuously supplied gas, liquid or gas mixing with liquid to generate a fixed flushing pressure, or an intermittently supplied gas, liquid or gas mixing with liquid to generate a pulsed flushing pressure. The gas can be, for example, air, nitrogen, inert gas or other suitable gases, and the liquid can be, for example, liquid water, water-containing solution, or other suitable solutions such as washing liquid, but is not limited thereto. For example, the third fluid  300  can also be a liquid and a gas supplied in sequence, for example, after supplying liquid for a period of time, changed to supplying gas for another period of time. Since the third fluid  300  supplied lastly is a gas, a residual washing liquid can be blown dry to prevent the residual washing liquid from causing particle deposition. For example, when the third fluid  300  is a gas, a flow rate of the third fluid  300  ejected from the flushing member  50  ranges from about 200 SLM to 4,000 SLM. When the third fluid  300  is a liquid, a flow rate of the third fluid  300  ejected from the flushing member  50  ranges from about 200 SLM to 4,000 SLM. 
     In summary, according to the self-cleaning negative-pressure ejector of the invention, one or more of the following advantages can be provided: (1) Capable of generating high negative pressure to suck gas and solving the problem of blockage of solid particles in the fluid pipelines. (2) Having a self-cleaning function capable of performing detersive operation of automatic dust cleaning under a non-stop operation state of the whole equipment. (3) Capable of self-clearing solid blockage on the pipe walls of the negative-pressure ejector and the first fluid pipeline by using gas and/or liquid jets. (4) A direction in which the first fluid being sucked is inclined relative to an ejection direction of the second fluid, thereby capable of preventing solid particles from depositing in the first fluid pipeline. (5) Capable of removing water vapor remaining in the first fluid pipeline during a flushing process and preventing solid particles from depositing by ejecting a third fluid into the first fluid pipeline. (6) A length of the suction chamber can be extended to reduce a frequency of engineering staff cleaning the suction chamber manually. (7) The entire device of the negative-pressure ejector has no consumables, no risk of breakage, has long service life and the components can be replaced conveniently. 
     Note that the specification relating to the above embodiments should be construed as exemplary rather than as limitative of the present invention, with many variations and modifications being readily attainable by a person of average skill in the art without departing from the spirit or scope thereof as defined by the appended claims and their legal equivalents.