CN114922868A - Telescopic nozzle jet pump - Google Patents
Telescopic nozzle jet pump Download PDFInfo
- Publication number
- CN114922868A CN114922868A CN202210783704.5A CN202210783704A CN114922868A CN 114922868 A CN114922868 A CN 114922868A CN 202210783704 A CN202210783704 A CN 202210783704A CN 114922868 A CN114922868 A CN 114922868A
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- China
- Prior art keywords
- sleeve
- pressure fluid
- suction chamber
- pipe
- fluid inlet
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000012530 fluid Substances 0.000 claims abstract description 49
- 238000004891 communication Methods 0.000 claims description 2
- 238000002347 injection Methods 0.000 abstract 1
- 239000007924 injection Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 4
- 238000005507 spraying Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
- F04F5/46—Arrangements of nozzles
- F04F5/461—Adjustable nozzles
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
The invention discloses a jet pump with a telescopic nozzle, which relates to the technical field of jet pumps and comprises the following components: a suction chamber; a high pressure fluid inlet pipe; an intermediate pressure fluid outlet pipe; a low pressure fluid inlet pipe; the nozzle is of a telescopic structure formed by sleeving a first sleeve and a last sleeve, the first sleeve is connected with one end of a high-pressure fluid inlet pipe, the sectional areas of the inner cavities of the first sleeve and the last sleeve are both in a tapered shape, a sliding groove is formed in the inner wall of the first sleeve, and a sliding block matched with the sliding groove is arranged at one end, connected with the first sleeve, of the last sleeve; one end of the driving piece is fixedly connected with the inner wall of the suction chamber, and the other end of the driving piece is connected with the tail sleeve; wherein, through the action of the end sleeve, a gap can be generated between the first sleeve and the end sleeve. The invention can generate a gap between the first section of the sleeve and the last section of the sleeve to realize the adjustment of the flow area of the nozzle, thereby realizing the adjustment of the injection speed of the nozzle.
Description
Technical Field
The invention relates to the technical field of jet pumps, in particular to a telescopic nozzle jet pump.
Background
At present, in the existing jet pump, the length of a nozzle is fixed and unchanged, and the area of a nozzle opening of the nozzle is fixed, namely, the overflowing area of the nozzle is fixed and unchanged, and the regulation of the spraying flow and the spraying speed of the nozzle cannot be realized.
Therefore, how to provide a jet pump capable of adjusting the flow area of a nozzle is a problem which needs to be solved urgently by the technical personnel in the field.
Disclosure of Invention
In view of this, the present invention provides a telescopic nozzle jet pump, which aims to solve one of the problems in the background art and realize the adjustment of the nozzle flow area.
In order to achieve the purpose, the invention adopts the following technical scheme:
a telescoping nozzle jet pump comprising:
a suction chamber;
the high-pressure fluid inlet pipe is connected with the first end of the suction chamber, the high-pressure fluid inlet pipe is communicated with the cavity of the suction chamber, and one end of the high-pressure fluid inlet pipe extends into the cavity of the suction chamber;
a medium pressure fluid outlet pipe connected to a second end of the suction chamber, the medium pressure fluid outlet pipe being in communication with a cavity of the suction chamber;
a low-pressure fluid inlet pipe connected to a sidewall of the suction chamber, the low-pressure fluid inlet pipe communicating with a cavity of the suction chamber;
the nozzle is of a telescopic structure formed by sleeving a first sleeve and a last sleeve, the first sleeve is connected with one end of the high-pressure fluid inlet pipe, the sectional areas of the inner cavities of the first sleeve and the last sleeve are both tapered, the sectional areas of the inner cavities of the first sleeve and the last sleeve are gradually reduced from the first sleeve to the last sleeve, a sliding groove is formed in the inner wall of the first sleeve, and a sliding block matched with the sliding groove is arranged at one end, connected with the first sleeve, of the last sleeve;
the driving piece is arranged in parallel with the nozzle, one end of the driving piece is fixedly connected with the inner wall of the suction chamber, and the other end of the driving piece is connected with the tail sleeve;
wherein, through the action of minor details sleeve pipe, can produce the clearance between major details sleeve pipe and minor details sleeve pipe.
Further, the telescopic nozzle jet pump further comprises a middle sleeve, the sectional area of the inner cavity of the middle sleeve is also of a tapered structure, a sliding groove is formed in the inner wall of the middle sleeve, a sliding block on the tail sleeve is matched with the sliding groove in the inner wall of the middle sleeve, a sliding block is arranged at one end, with a larger caliber, of the inner cavity of the middle sleeve, and the sliding block on the middle sleeve is matched with the sliding groove in the inner wall of the first sleeve.
Furthermore, the middle sleeve is provided with a plurality of middle sleeves, and the middle sleeves are mutually sleeved and connected.
Furthermore, a supporting plate is arranged at one end, far away from the high-pressure fluid inlet pipe, of the tail sleeve pipe, the supporting plate is fixedly connected with the tail sleeve pipe, and the driving piece is connected with the tail sleeve pipe through the supporting plate.
Further, the medium-pressure fluid outlet pipe comprises a straight-arm pipe and an expansion pipe, a small opening end of the expansion pipe is connected with one end of the straight-arm pipe, and the other end of the straight-arm pipe is communicated with the suction chamber.
Further, one end, close to the suction chamber, of the straight arm pipe extends into the suction chamber.
Further, the axes of the high pressure fluid inlet pipe, the medium pressure fluid outlet pipe and the nozzle are collinear.
Further, the driving member is an electric cylinder, an air cylinder or a hydraulic cylinder.
According to the technical scheme, compared with the prior art, the jet pump with the telescopic nozzle is characterized in that the nozzle is arranged into the telescopic structure formed by the first-section sleeve and the last-section sleeve in a sleeved mode, the last-section sleeve can slide relative to the first-section sleeve through the action of the driving piece, and then a gap is formed between the first-section sleeve and the last-section sleeve, so that the flow area of the nozzle is adjusted, and the jet speed of the nozzle is adjusted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural view of a telescopic nozzle jet pump provided by the present invention;
FIG. 2 is a schematic view of the nozzle of the present invention in an extended state;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2 in accordance with the present invention;
FIG. 4 is a schematic structural view of a nozzle provided in the present invention in a contracted state;
fig. 5 is a cross-sectional view taken in the direction B-B of fig. 4 in accordance with the present invention.
Wherein: 1 is a suction chamber; 2 is a high-pressure fluid inlet pipe; 3 is a medium pressure fluid outlet pipe; 31 is a straight arm pipe; 32 is an expansion tube; 4 is a low-pressure fluid inlet pipe; 5 is a nozzle; 6 is a driving piece; 7 is a supporting plate; 8 is a first section of sleeve; 9 is a tail sleeve; 10 is a chute; 11 is a slide block; and 12 is an intermediate sleeve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, an embodiment of the present invention discloses a telescopic nozzle jet pump, including:
a suction chamber 1;
the high-pressure fluid inlet pipe 2 is connected with the first end of the suction chamber 1, the high-pressure fluid inlet pipe 2 is communicated with the cavity of the suction chamber 1, and one end of the high-pressure fluid inlet pipe 2 extends into the cavity of the suction chamber 1;
the medium-pressure fluid outlet pipe 3 is connected with the second end of the suction chamber 1, and the medium-pressure fluid outlet pipe 3 is communicated with the cavity of the suction chamber 1;
a low-pressure fluid inlet pipe 4, wherein the low-pressure fluid inlet pipe 4 is connected with the side wall of the suction chamber 1, and the low-pressure fluid inlet pipe 4 is communicated with the cavity of the suction chamber 1;
the nozzle 5 is a telescopic structure formed by sleeving a first sleeve 8 and a last sleeve 9, the first sleeve 8 is connected with one end of the high-pressure fluid inlet pipe 2, the cross sections of the inner cavities of the first sleeve 8 and the last sleeve 9 are tapered, the cross sections of the inner cavities of the first sleeve 8 and the last sleeve 9 are gradually reduced from the first sleeve 8 to the last sleeve 9, a sliding groove 10 is formed in the inner wall of the first sleeve 8, and a sliding block 11 matched with the sliding groove 10 is arranged at one end, connected with the first sleeve 8, of the last sleeve 9;
the driving piece 6 is arranged in parallel with the nozzle 5, one end of the driving piece 6 is fixedly connected with the inner wall of the suction chamber 1, and the other end of the driving piece 6 is connected with a tail sleeve 9;
wherein a gap can be created between the first casing 8 and the last casing 9 by the action of the last casing 9.
Wherein, the inner wall of the first casing 8 is provided with a plurality of sliding grooves 10, the number of the sliding grooves 10 in this embodiment is preferably four, in other embodiments, the number of the sliding grooves 10 can be specifically set according to actual requirements, the bottom surfaces of the four sliding grooves 10 in this embodiment are located on the same cylindrical surface, the last casing 9 is correspondingly provided with four sliding blocks 11, the tops of the sliding blocks 11 are in contact with the bottoms of the sliding grooves 10, the coaxiality of the first casing 8 and the last casing 9 in the relative movement process can be ensured by arranging the sliding grooves 10 on the inner wall of the first casing 8 and arranging the corresponding sliding blocks 11 at the end of the last casing 9 connected with the first casing 8, and the sectional area of the inner cavity of the first casing 8 close to the end of the last casing 9 is smaller than the sectional area of the outer wall of the last casing 9 at the position where the sliding blocks 11 are arranged, when the stroke of the tail sleeve 9 reaches the maximum, the end wall of the sliding groove 10 on the inner wall of the first sleeve 8 can limit a sliding block 11 arranged at the end part of the tail sleeve 9; when the end sleeve 9 slides from the maximum stroke to the minimum stroke, a gap is gradually generated between the outer wall of the end sleeve 9 and the inner wall of the first sleeve 8, and the gap is gradually increased along with the contraction of the end sleeve 9, wherein the maximum stroke of the end sleeve 9 is the maximum protruding amount of the end sleeve 9 from the first sleeve 8, and the minimum stroke of the end sleeve 9 is the minimum protruding amount of the end sleeve 9 from the first sleeve 8. The driving piece 6 is connected with a controller, and the extending amount of the tail sleeve 9 from the head sleeve 8 is controlled by the controller.
According to some embodiments of the present invention, the telescopic nozzle 5 further includes an intermediate sleeve 12, the cross-sectional area of the inner cavity of the intermediate sleeve 12 is also a tapered structure, a sliding groove 10 is formed on the inner wall of the intermediate sleeve 12, a sliding block 11 on the last sleeve 9 is matched with the sliding groove 10 on the inner wall of the intermediate sleeve 12, a sliding block 11 is formed at the end of the intermediate sleeve 12 with a larger bore, and the sliding block 11 on the intermediate sleeve 12 is matched with the sliding groove 10 on the inner wall of the first sleeve 8. Through the setting of middle sleeve pipe 12, can realize that middle sleeve pipe 12 produces the clearance respectively with first section sleeve pipe 8 and last section sleeve pipe 9 between, and then can realize the regulation to nozzle 5 flow area.
According to some embodiments of the present invention, a plurality of intermediate sleeves 12 are provided, the plurality of intermediate sleeves 12 are mutually sleeved, specifically, a sliding groove 10 is provided on an inner wall of each intermediate sleeve 12, a sliding block 11 is provided on an outer wall of each intermediate sleeve 12, two adjacent intermediate sleeves 12 are connected to the sliding block 11 through the sliding groove 10, by the arrangement of the plurality of intermediate sleeves 12, on the premise that the volume of the suction chamber 1 is fixed, the length of the first section of sleeve 8 can be reduced, and by the arrangement of the plurality of sections of intermediate sleeves 12, the extension and retraction of the nozzle 5 can be realized, thereby realizing the adjustment of the flow area.
In the above embodiment, preferably, the end of the end sleeve 9 far away from the high-pressure fluid inlet pipe 2 is provided with the support plate 7, the support plate 7 is fixedly connected with the end sleeve 9, and the driving member 6 is connected with the end sleeve 9 through the support plate 7. Through the setting of backup pad 7, be convenient for guarantee the synchronism of driving piece 6 and nozzle 5 flexible, in other embodiments, also can be through setting up the flexible of a plurality of driving pieces 6 with control nozzle 5, through the setting of a plurality of driving pieces 6, can guarantee the stability of the flexible process of nozzle 5.
In the present embodiment, the medium-pressure fluid outlet tube 3 includes a straight arm tube 31 and an expansion tube 32, a small-mouth end of the expansion tube 32 is connected to one end of the straight arm tube 31, and the other end of the straight arm tube 31 communicates with the suction chamber 1. Preferably, one end of the straight arm tube 31 near the suction chamber 1 protrudes into the suction chamber 1. The axes of the high pressure fluid inlet pipe 2, the medium pressure fluid outlet pipe 3 and the nozzle 5 are collinear. The high-pressure fluid ejected from the nozzle 5 is mixed with the low-pressure fluid ejected from the low-pressure fluid inlet pipe 4, and the mixed fluid is mixed again in the straight arm pipe 31 to form a medium-pressure fluid, which is ejected from the extension pipe 32.
According to some embodiments of the invention, the driving member 6 is an electric cylinder, an air cylinder or a hydraulic cylinder. In this embodiment, the driving member 6 is preferably an electric cylinder.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A telescopic nozzle jet pump, comprising:
a suction chamber;
the high-pressure fluid inlet pipe is connected with the first end of the suction chamber, the high-pressure fluid inlet pipe is communicated with the cavity of the suction chamber, and one end of the high-pressure fluid inlet pipe extends into the cavity of the suction chamber;
a medium pressure fluid outlet pipe connected to a second end of the suction chamber, the medium pressure fluid outlet pipe being in communication with a cavity of the suction chamber;
a low-pressure fluid inlet pipe connected to a sidewall of the suction chamber, the low-pressure fluid inlet pipe communicating with a cavity of the suction chamber;
the nozzle is of a telescopic structure formed by sleeving a first sleeve and a last sleeve, the first sleeve is connected with one end of the high-pressure fluid inlet pipe, the sectional areas of the inner cavities of the first sleeve and the last sleeve are both tapered, the sectional areas of the inner cavities of the first sleeve and the last sleeve are gradually reduced from the first sleeve to the last sleeve, a sliding groove is formed in the inner wall of the first sleeve, and a sliding block matched with the sliding groove is arranged at one end, connected with the first sleeve, of the last sleeve;
the driving piece is arranged in parallel with the nozzle, one end of the driving piece is fixedly connected with the inner wall of the suction chamber, and the other end of the driving piece is connected with the tail sleeve;
wherein, through the action of minor details sleeve pipe, can produce the clearance between major details sleeve pipe and minor details sleeve pipe.
2. The telescopic nozzle jet pump according to claim 1, further comprising an intermediate sleeve, wherein the sectional area of the inner cavity of the intermediate sleeve is also of a tapered structure, a sliding groove is formed in the inner wall of the intermediate sleeve, a sliding block on the last sleeve is matched with the sliding groove in the inner wall of the intermediate sleeve, a sliding block is arranged at one end of the intermediate sleeve with a larger bore, and the sliding block on the intermediate sleeve is matched with the sliding groove in the inner wall of the first sleeve.
3. The telescopic nozzle jet pump according to claim 2, wherein the intermediate sleeve is provided in plurality, and the plurality of intermediate sleeves are nested with each other.
4. The telescopic nozzle jet pump of claim 1, wherein a support plate is provided at an end of the stub sleeve away from the high-pressure fluid inlet pipe, the support plate is fixedly connected with the stub sleeve, and the driving member is connected with the stub sleeve through the support plate.
5. The telescopic nozzle jet pump according to claim 1, wherein the medium-pressure fluid outlet pipe comprises a straight-armed pipe and an expansion pipe, a small end of the expansion pipe is connected with one end of the straight-armed pipe, and the other end of the straight-armed pipe is communicated with the suction chamber.
6. The telescopic nozzle jet pump according to claim 5, wherein an end of the straight arm tube near the suction chamber protrudes into the suction chamber.
7. The telescopic nozzle jet pump according to claim 1, wherein the axes of the high pressure fluid inlet pipe, the medium pressure fluid outlet pipe and the nozzle are on the same straight line.
8. A telescopic nozzle jet pump according to claim 1, wherein the driving member is an electric, pneumatic or hydraulic cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210783704.5A CN114922868B (en) | 2022-07-05 | 2022-07-05 | Telescopic nozzle jet pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210783704.5A CN114922868B (en) | 2022-07-05 | 2022-07-05 | Telescopic nozzle jet pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114922868A true CN114922868A (en) | 2022-08-19 |
| CN114922868B CN114922868B (en) | 2023-12-08 |
Family
ID=82816077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210783704.5A Active CN114922868B (en) | 2022-07-05 | 2022-07-05 | Telescopic nozzle jet pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114922868B (en) |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH101872A (en) * | 1921-12-12 | 1923-11-01 | Eugene Caron Virgile | A method and apparatus for the suction and compression of a gaseous fluid. |
| DE676155C (en) * | 1936-04-08 | 1939-05-26 | Alex Friedmann Fa | Injector with automatic slack valve closure |
| CN2081900U (en) * | 1990-08-13 | 1991-07-31 | 北京市朝阳区东郊民用器具厂 | Telescopic high-pressure inflator |
| CN1782499A (en) * | 2004-11-02 | 2006-06-07 | 巴布考克日立株式会社 | After-air nozzle for two-stage combustion boiler, and a two-stage combustion boiler, and combustion method using the same |
| CN2861573Y (en) * | 2005-10-26 | 2007-01-24 | 孙孝庆 | Soil dehydration used jet pump capable of optimizing choke |
| CN102080674A (en) * | 2010-10-11 | 2011-06-01 | 河南理工大学 | Jet injector with variable nozzle position |
| CN103016423A (en) * | 2012-12-22 | 2013-04-03 | 天津天雷科技有限公司 | Novel changeable-jet-nozzle-position steam ejector |
| CN104295538A (en) * | 2014-09-29 | 2015-01-21 | 江苏大学 | Jet pump with variable area ratio |
| CN105650039A (en) * | 2016-03-15 | 2016-06-08 | 江苏大学 | Jet pump allowing distance between venturi and nozzle to be changed |
| EP3085968A1 (en) * | 2015-04-22 | 2016-10-26 | Ellehammer A/S | A set of parts for being assembled to form an ejector pump and a method of using an ejector pump |
| CN108266411A (en) * | 2018-01-16 | 2018-07-10 | 苟千舟 | A kind of adjustable injector of structural parameters |
| WO2019103608A1 (en) * | 2017-11-21 | 2019-05-31 | Bort De Graaf Koel - En Klimaattechniek B.V. | Ejector |
| CN111207119A (en) * | 2020-03-06 | 2020-05-29 | 北京首创环境科技有限公司 | Venturi vacuum pump with self-adaptive capacity |
| CN211398085U (en) * | 2019-12-31 | 2020-09-01 | 广州泰格测控技术有限公司 | Gas sampling jet pump |
| CN212225624U (en) * | 2020-06-01 | 2020-12-25 | 福建省裕翔铸业有限公司 | Novel jet pump |
| WO2021012880A1 (en) * | 2019-07-22 | 2021-01-28 | 浙江沈力防爆机电有限公司 | Inducible jet fan |
-
2022
- 2022-07-05 CN CN202210783704.5A patent/CN114922868B/en active Active
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH101872A (en) * | 1921-12-12 | 1923-11-01 | Eugene Caron Virgile | A method and apparatus for the suction and compression of a gaseous fluid. |
| DE676155C (en) * | 1936-04-08 | 1939-05-26 | Alex Friedmann Fa | Injector with automatic slack valve closure |
| CN2081900U (en) * | 1990-08-13 | 1991-07-31 | 北京市朝阳区东郊民用器具厂 | Telescopic high-pressure inflator |
| CN1782499A (en) * | 2004-11-02 | 2006-06-07 | 巴布考克日立株式会社 | After-air nozzle for two-stage combustion boiler, and a two-stage combustion boiler, and combustion method using the same |
| CN2861573Y (en) * | 2005-10-26 | 2007-01-24 | 孙孝庆 | Soil dehydration used jet pump capable of optimizing choke |
| CN102080674A (en) * | 2010-10-11 | 2011-06-01 | 河南理工大学 | Jet injector with variable nozzle position |
| CN103016423A (en) * | 2012-12-22 | 2013-04-03 | 天津天雷科技有限公司 | Novel changeable-jet-nozzle-position steam ejector |
| CN104295538A (en) * | 2014-09-29 | 2015-01-21 | 江苏大学 | Jet pump with variable area ratio |
| EP3085968A1 (en) * | 2015-04-22 | 2016-10-26 | Ellehammer A/S | A set of parts for being assembled to form an ejector pump and a method of using an ejector pump |
| CN105650039A (en) * | 2016-03-15 | 2016-06-08 | 江苏大学 | Jet pump allowing distance between venturi and nozzle to be changed |
| WO2019103608A1 (en) * | 2017-11-21 | 2019-05-31 | Bort De Graaf Koel - En Klimaattechniek B.V. | Ejector |
| CN108266411A (en) * | 2018-01-16 | 2018-07-10 | 苟千舟 | A kind of adjustable injector of structural parameters |
| WO2021012880A1 (en) * | 2019-07-22 | 2021-01-28 | 浙江沈力防爆机电有限公司 | Inducible jet fan |
| CN211398085U (en) * | 2019-12-31 | 2020-09-01 | 广州泰格测控技术有限公司 | Gas sampling jet pump |
| CN111207119A (en) * | 2020-03-06 | 2020-05-29 | 北京首创环境科技有限公司 | Venturi vacuum pump with self-adaptive capacity |
| CN212225624U (en) * | 2020-06-01 | 2020-12-25 | 福建省裕翔铸业有限公司 | Novel jet pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114922868B (en) | 2023-12-08 |
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