CN110748718A - Transmission apparatus - Google Patents

Transmission apparatus Download PDF

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Publication number
CN110748718A
CN110748718A CN201911239388.XA CN201911239388A CN110748718A CN 110748718 A CN110748718 A CN 110748718A CN 201911239388 A CN201911239388 A CN 201911239388A CN 110748718 A CN110748718 A CN 110748718A
Authority
CN
China
Prior art keywords
joint
channel
pipe
nut
sealing
Prior art date
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.)
Pending
Application number
CN201911239388.XA
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Chinese (zh)
Inventor
周伊优
肖树坤
郭朝阳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangxi Hongdu Aviation Industry Group Co Ltd
Original Assignee
Jiangxi Hongdu Aviation Industry Group Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Jiangxi Hongdu Aviation Industry Group Co Ltd filed Critical Jiangxi Hongdu Aviation Industry Group Co Ltd
Priority to CN201911239388.XA priority Critical patent/CN110748718A/en
Publication of CN110748718A publication Critical patent/CN110748718A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00Rigid pipes
    • F16L9/18Double-walled pipes; Multi-channel pipes or pipe assemblies
    • F16L9/19Multi-channel pipes or pipe assemblies
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L41/00Branching pipes; Joining pipes to walls
    • F16L41/02Branch units, e.g. made in one piece, welded, riveted
    • F16L41/03Branch units, e.g. made in one piece, welded, riveted comprising junction pieces for four or more pipe members

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)

Abstract

The invention proposes a transmission device comprising: catheter and 2 fittings. Wherein: the second joint is connected with the fourth joint through an inner channel; the third joint is connected with the first joint through an outer channel; the second joint is arranged in the first joint and is retracted into the first joint; the first joint, the third joint and the fourth joint are provided with external threads; the sealing ring is placed inside the second joint; the two ends of the inner pipe in the guide pipe, which extend out of the outer pipe, are respectively inserted into second joints in the joints; the nut on the guide pipe is connected with the first joint on the special joint through threads; the sealing gasket is used for sealing between the nut and the first joint; the sealing ring is used for sealing between the inner pipe and the joint. The guide pipe and the special joint of the embodiment of the invention have two channels, can simultaneously convey two different types of fluid media, have compact structure, are convenient for integration, refinement and lightweight design of a pipeline system, and are particularly suitable for occasions with high space and precision requirements, such as aviation and the like.

Description

Transmission apparatus
Technical Field
The invention relates to the technical field of aviation pipeline transmission, in particular to transmission equipment.
Background
In real life, fluid conveying is realized by using pipelines, and fluids with different media are conveyed by using different pipelines. In some devices, because of the requirements of different working media, multiple pipelines must be installed to achieve the purpose of conveying multiple media.
The applicant finds out through research that: if in the equipment that requires the integrated design, when there are numerous pipeline to arrange, will cause the structure complicacy, especially in some small-size equipment, because of the narrow and small of its interior space, there is the very inconvenient problem of installation and maintenance.
Disclosure of Invention
(1) Objects of the invention
The invention aims to solve the problem that in equipment with integrated design, when a plurality of pipelines are arranged, the structure is complex, and particularly in some small-sized equipment, the installation and maintenance are very inconvenient due to the narrow space inside the small-sized equipment.
(2) Technical scheme
A transmission apparatus comprising: a conduit 13 and 2 fittings 14, wherein:
the conduit 13 includes: the pipe is by outer tube 1, inner tube 2, connecting plate 3, nut 4, sealed pad 5, wherein:
the connecting plates 3 are arranged between the outer pipe 1 and the inner pipe 2 at intervals;
the outer pipe 1 and the inner pipe 2 are integrated through a plurality of connecting plates 3;
the inner pipe 2 extends out of two ends of the outer pipe 1; the nuts 4 are arranged at two ends of the outer pipe 1; the nut 4 is provided with an internal thread; the sealing gasket 5 is placed in the nut 4;
a first channel is formed between the outer pipe 1 and the inner pipe 2, and a second channel is formed in the inner pipe 2;
the joint 14 includes: a first joint 6, a second joint 7, a third joint 9, a fourth joint 10, an inner channel 11, an outer channel 12 and a sealing ring 8;
the second joint 7 is connected with the fourth joint 10 through an inner channel 11;
the third joint 9 is connected with the first joint 6 through an outer channel 12;
the second joint 7 is arranged in the first joint 6 and is retracted into the first joint 6;
the first joint 6, the third joint 9 and the fourth joint 10 are provided with external threads;
a sealing ring 8 is placed inside the second joint 7.
The two ends of the inner pipe 2 in the guide pipe 13, which extend out of the outer pipe 1, are respectively inserted into the second joints 7 in the joints 14;
the nut 4 on the conduit 13 is connected with the first joint 6 on the special joint 14 through threads;
the sealing gasket 5 is used for sealing between the nut 4 and the first joint 6;
a sealing ring 8 is used for sealing between the inner tube 2 and the joint 7.
(3) Technical effects
The pipeline system can be composed of the guide pipe 13 and the special joint 14, two channels exist in the guide pipe 13 and the special joint 14, two different types of fluid media can be conveyed simultaneously, the structure is compact, integration, refinement and lightweight design of the pipeline system are facilitated, and the pipeline system is particularly suitable for occasions with high space and precision requirements such as aviation and the like.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of a conduit and a joint of a transfer apparatus according to an embodiment of the invention.
FIG. 2 is a schematic view of a catheter according to an embodiment of the present invention.
FIG. 3 is a schematic view of a section B-B according to an embodiment of the present invention.
FIG. 4 is a schematic view of a section A-A according to an embodiment of the present invention.
Fig. 5 is a schematic view of a special joint according to an embodiment of the present invention.
FIG. 6 is a schematic view of a catheter connected to a special adapter according to an embodiment of the present invention.
Fig. 7 is a schematic view of the working principle of the catheter and the special joint according to the embodiment of the invention.
Wherein: the guide pipe comprises an outer pipe 1, an inner pipe 2, a connecting plate 3, a nut 4, a sealing gasket 5, a first joint 6, a second joint 7, a sealing ring 8, a third joint 9, a fourth joint 10, an inner channel 11, an outer channel 12, a guide pipe 13 and a joint 14.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all 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.
Features and illustrative embodiments of various aspects of the invention are described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is in no way limited to any specific arrangement and method set forth below, but rather covers any improvements, substitutions and modifications in structure, method, and apparatus without departing from the spirit of the invention. In the drawings and the following description, well-known structures and techniques are not shown to avoid unnecessarily obscuring the present invention.
It should be noted that, in the case of conflict, the embodiments and features of the embodiments of the present invention may be combined with each other, and the respective embodiments may be mutually referred to and cited. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 is a schematic diagram of a transmission device according to an embodiment of the present invention.
As shown in fig. 1, the transfer device comprises a catheter 13 and a specialty joint 14.
FIG. 2 is a schematic view of a catheter according to an embodiment of the present invention. FIG. 3 is a schematic view of a section B-B according to an embodiment of the present invention. FIG. 4 is a schematic view of a section A-A according to an embodiment of the present invention.
Referring to fig. 2, 3 and 4: the guide pipe is composed of an outer pipe 1, an inner pipe 2, a connecting plate 3, a nut 4 and a sealing gasket 5. The outer pipe 1 and the inner pipe 2 are integrated through a plurality of connecting plates 3; a plurality of connecting plates 3 are arranged at intervals so that the upper part and the lower part of the channel are communicated; the inner pipe 2 extends out of two ends of the outer pipe 1; the nuts 4 are arranged at two ends of the outer pipe 1; the nut 4 is provided with an internal thread; the gasket 5 is put into the nut 4. A first channel is formed between the outer tube 1 and the inner tube 2, and a second channel is formed in the inner tube 2.
Fig. 5 is a schematic view of a special joint according to an embodiment of the present invention.
Referring to fig. 5: the special joint consists of a first joint 6, a second joint 7, a third joint 9, a fourth joint 10, an inner channel 11, an outer channel 12 and a sealing ring 8. The second joint 7 is connected with the fourth joint 10 through an inner channel 11; the third joint 9 is connected with the first joint 6 through an outer channel 12; the second joint 7 is arranged in the first joint 6 and is retracted into the first joint 6; the first joint 6, the third joint 9 and the fourth joint 10 are provided with external threads; a sealing ring 8 is placed inside the second joint 7.
FIG. 6 is a schematic view of a catheter connected to a special adapter according to an embodiment of the present invention.
Referring to fig. 1 and 6: the connecting method of the conduit 13 and the special joint 14 is as follows: the inner pipe 2 in the conduit 13 is inserted into the second joint 7 in the special joint 14, and then the nut 4 on the conduit 13 is connected with the first joint 6 on the special joint 14 through threads.
The sealing gasket 5 is used for sealing between the nut 4 and the first joint 6; a sealing ring 8 is used for sealing between the inner tube 2 and the joint 7.
Fig. 7 is a schematic view of the working principle of the catheter and the special joint according to the embodiment of the invention.
Referring to fig. 1 and 7, the working principle of the invention is as follows:
the fluid medium I to be conveyed enters the outer channel 12 in the left special joint 14 from the third joint 9 on the left special joint 14 in the figure, then flows out from the first joint 6, enters the channel I in the left side of the guide pipe 13, enters the first joint 6 in the right special joint 14, flows through the outer channel 12 in the right special joint 14, and flows out from the third joint 9 on the right special joint 14;
the fluid medium II to be conveyed enters the inner channel 11 of the left special joint 14 from the fourth joint 10 on the left special joint 14 in the figure, then flows out from the joint 7, enters the channel II in the left guide pipe 13, then enters the joint 7 in the right special joint 14, flows through the inner channel 11 of the right special joint 14 and flows out from the fourth joint 10 on the right special joint 14. Thereby, the function of conveying two fluid media by one conduit is realized.
In practical use, the conveying directions of the two fluid media can be the same direction or opposite directions.
In some embodiments, the transmission device is characterized as follows:
a. the invention is composed of a conduit 13 and a special joint 14;
b. two channels are present in the conduit 13 and the special joint 14, which can simultaneously convey two different kinds of fluid media.
In some embodiments, the features of the conduit 13 are as follows:
a. the guide pipe is composed of an outer pipe 1, an inner pipe 2, a connecting plate 3, a nut 4 and a sealing gasket 5.
b. The outer pipe 1 and the inner pipe 2 are integrated through a connecting plate 3;
c. a plurality of connecting plates 3 are arranged at intervals so as to facilitate the communication of the upper part and the lower part of the channel I;
d. the inner pipe 2 extends out of two ends of the outer pipe 1;
e. the nuts 4 are arranged at two ends of the outer pipe 1; the nut 4 is provided with an internal thread; the sealing gasket 5 is placed in the nut 4;
f. a first channel is formed between the outer tube 1 and the inner tube 2, and a second channel is formed in the inner tube 2.
In some embodiments, the special joint 14 features as follows:
a. the special joint 14 consists of a first joint 6, a second joint 7, a third joint 9, a fourth joint 10, an inner channel 11, an outer channel 12 and a sealing ring 8;
b. the second joint 7 is connected with the fourth joint 10 through an inner channel 11;
c. the third joint 9 is connected with the I6 through an outer channel 12;
d. the second joint 7 is arranged in the first joint 6 and is retracted into the first joint 6;
e. the first joint 6 and the third joint 9 are provided with external threads on the fourth joint 10;
f. a sealing ring 8 is placed inside the second joint 7.
The embodiment of the invention can be composed of a guide pipe 13 and a special joint 14, two channels exist in the guide pipe 13 and the special joint 14, two different types of fluid media can be conveyed simultaneously, the structure is compact, and the integration, refinement and lightweight design of a pipeline system are facilitated.
In some embodiments, referring to fig. 2, 3 and 4, the conduit 13 is composed as follows:
a. integrally forming the outer pipe 1, the inner pipe 2 and the connecting plate 3; the inner pipe 2 extends out of two ends of the outer pipe 1; a first channel is formed between the outer pipe 1 and the inner pipe 2, and a second channel is formed in the inner pipe 2;
b. two nuts 4 are respectively penetrated from two ends of the outer tube 1;
c. respectively manufacturing two ends of the outer tube 1 into bent edges;
d. the two pieces of gasket 5 are placed in the two pieces of nut 4, respectively.
In some embodiments, referring to fig. 5, the specialty joint 14 composition implementation is as follows:
a. integrally forming a first joint 6, a second joint 7, a third joint 9, a fourth joint 10, an inner channel 11 and an outer channel 12; the second joint 7 is connected with the fourth joint 10 through an inner channel 11; the third joint 9 is connected with the first joint 6 through an outer channel 12;
b. external threads are formed on the first joint 6, the third joint 9 and the fourth joint 10;
c. the sealing ring 8 is placed in the second joint 7.
In some embodiments, referring to fig. 1 and 6, the conduit 13 and the special fitting 14 are implemented as follows:
a. respectively inserting the inner pipes 2 in the two ends of the conduit 13 into the second joints 7 in the special joints 14 at the two ends;
b. the nuts 4 on the two ends of the conduit 13 are respectively connected with the first joints 6 on the special joints 14 on the two ends through threads.
In some embodiments, a transmission device may include: a conduit 13 and 2 fittings 14. Wherein: the conduit 13 includes: the pipe is by outer tube 1, inner tube 2, connecting plate 3, nut 4, sealed pad 5, wherein: the connecting plates 3 are arranged between the outer pipe 1 and the inner pipe 2 at intervals; the outer pipe 1 and the inner pipe 2 are integrated through a plurality of connecting plates 3; the inner pipe 2 extends out of two ends of the outer pipe 1; the nuts 4 are arranged at two ends of the outer pipe 1; the nut 4 is provided with an internal thread; the sealing gasket 5 is placed in the nut 4; a first channel is formed between the outer pipe 1 and the inner pipe 2, and a second channel is formed in the inner pipe 2; the joint 14 includes: a first joint 6, a second joint 7, a third joint 9, a fourth joint 10, an inner channel 11, an outer channel 12 and a sealing ring 8; the second joint 7 is connected with the fourth joint 10 through an inner channel 11; the third joint 9 is connected with the first joint 6 through an outer channel 12; the second joint 7 is arranged in the first joint 6 and is retracted into the first joint 6; the first joint 6, the third joint 9 and the fourth joint 10 are provided with external threads; the sealing ring 8 is placed inside the second joint 7; the two ends of the inner pipe 2 in the guide pipe 13, which extend out of the outer pipe 1, are respectively inserted into the second joints 7 in the joints 14; the nut 4 on the conduit 13 is connected with the first joint 6 on the special joint 14 through threads; the sealing gasket 5 is used for sealing between the nut 4 and the first joint 6; a sealing ring 8 is used for sealing between the inner tube 2 and the joint 7.
In some embodiments, the second fitting 7 is within the first fitting 6 and is retracted into the first fitting 6.
In some embodiments, the first, third and fourth couplings 6, 9, 10 are externally threaded.
In some embodiments, channel one is used to transmit the first medium; and the second channel is used for transmitting a second medium.
The outer channel 12 is L-shaped. The inner channel 11 is in-line. The joint 14 is integrally cast. The first channel and the second channel are not communicated.
It should be noted that the above-mentioned flow operations may be combined and applied in different degrees, and for simplicity, implementation manners of various combinations are not described again, and those skilled in the art may flexibly adjust the sequence of the above-mentioned operation steps according to actual needs, or flexibly combine the above-mentioned steps, and the like.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.

Claims (8)

1. A transmission apparatus, comprising: a conduit (13) and 2 fittings (14), wherein:
the catheter (13) comprises: the pipe is by outer tube (1), inner tube (2), connecting plate (3), nut (4), sealed pad (5), wherein:
the connecting plates (3) are arranged between the outer pipe (1) and the inner pipe (2) at intervals;
the outer pipe (1) and the inner pipe (2) are integrated through a plurality of connecting plates (3);
the inner pipe (2) extends out of two ends of the outer pipe (1); the nuts (4) are arranged at two ends of the outer pipe (1); the nut (4) is provided with an internal thread; the sealing gasket (5) is placed in the nut (4);
a first channel is formed between the outer pipe (1) and the inner pipe (2), and a second channel is formed in the inner pipe (2);
the joint (14) comprises: the device comprises a first joint (6), a second joint (7), a third joint (9), a fourth joint (10), an inner channel (11), an outer channel (12) and a sealing ring (8);
the second joint (7) is connected with the fourth joint (10) through an inner channel (11);
the third joint (9) is connected with the first joint (6) through an outer channel (12);
the second joint (7) is arranged in the first joint (6) and is retracted into the first joint (6);
the first joint (6), the third joint (9) and the fourth joint (10) are provided with external threads;
the sealing ring (8) is placed inside the second joint (7);
the two ends of the inner pipe (2) in the guide pipe (13) extending out of the outer pipe (1) are respectively inserted into the second joints (7) in the joints (14);
the nut (4) on the conduit (13) is connected with the first joint (6) on the special joint (14) through threads;
the sealing gasket (5) is used for sealing between the nut (4) and the first joint (6);
the sealing ring (8) is used for sealing between the inner pipe (2) and the joint (7).
2. The apparatus of claim 1, wherein:
the second joint (7) is inside the first joint (6) and is retracted into the first joint (6).
3. The apparatus of claim 1, wherein:
the first joint (6), the third joint (9) and the fourth joint (10) are provided with external threads.
4. The apparatus of claim 1, wherein:
the channel one is used for transmitting a first medium;
and the second channel is used for transmitting a second medium.
5. The apparatus of claim 4, wherein:
the outer channel (12) is L-shaped.
6. The apparatus of claim 4, wherein:
the inner channel (11) is in the shape of a straight line.
7. The apparatus of claim 4, wherein:
the joint (14) is integrally cast.
8. The apparatus of any one of claims 1-7, wherein:
the first channel and the second channel are not communicated.
CN201911239388.XA 2019-12-05 2019-12-05 Transmission apparatus Pending CN110748718A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911239388.XA CN110748718A (en) 2019-12-05 2019-12-05 Transmission apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911239388.XA CN110748718A (en) 2019-12-05 2019-12-05 Transmission apparatus

Publications (1)

Publication Number Publication Date
CN110748718A true CN110748718A (en) 2020-02-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911239388.XA Pending CN110748718A (en) 2019-12-05 2019-12-05 Transmission apparatus

Country Status (1)

Country Link
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111998145A (en) * 2020-09-15 2020-11-27 宁波新高流体控制技术有限公司 Gas-liquid two-phase flow water mist gun connecting hose and assembling method thereof
CN113464749A (en) * 2021-08-14 2021-10-01 程波 Single-ended universal joint and application method thereof

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN87207919U (en) * 1987-05-09 1987-12-31 谷志华 Pipe joints
US20070241560A1 (en) * 2006-04-18 2007-10-18 Malone David S Coaxial quick connector
CN201129580Y (en) * 2007-12-21 2008-10-08 柳林 Double-layer oil delivery pipe
CN202868126U (en) * 2012-10-26 2013-04-10 凡希云 Hot-and-cold water integrated water pipe
CN104747838A (en) * 2013-12-27 2015-07-01 舟山海川船舶机械有限公司 Water inputting and returning pipe joint of double-layer drill rod
CN106032860A (en) * 2015-09-02 2016-10-19 天津友大金属结构制造有限公司 Heat exchange tube for remote transportation
CN207421561U (en) * 2017-11-20 2018-05-29 天津市华意保温制品有限公司 A kind of energy saving outer protection tube
CN208123656U (en) * 2018-02-09 2018-11-20 科力科华(武汉)科技有限公司 A kind of cyclic suction equipment
CN110242803A (en) * 2019-07-11 2019-09-17 厦门三骏工贸有限公司 Multichannel hose

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN87207919U (en) * 1987-05-09 1987-12-31 谷志华 Pipe joints
US20070241560A1 (en) * 2006-04-18 2007-10-18 Malone David S Coaxial quick connector
CN201129580Y (en) * 2007-12-21 2008-10-08 柳林 Double-layer oil delivery pipe
CN202868126U (en) * 2012-10-26 2013-04-10 凡希云 Hot-and-cold water integrated water pipe
CN104747838A (en) * 2013-12-27 2015-07-01 舟山海川船舶机械有限公司 Water inputting and returning pipe joint of double-layer drill rod
CN106032860A (en) * 2015-09-02 2016-10-19 天津友大金属结构制造有限公司 Heat exchange tube for remote transportation
CN207421561U (en) * 2017-11-20 2018-05-29 天津市华意保温制品有限公司 A kind of energy saving outer protection tube
CN208123656U (en) * 2018-02-09 2018-11-20 科力科华(武汉)科技有限公司 A kind of cyclic suction equipment
CN110242803A (en) * 2019-07-11 2019-09-17 厦门三骏工贸有限公司 Multichannel hose

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111998145A (en) * 2020-09-15 2020-11-27 宁波新高流体控制技术有限公司 Gas-liquid two-phase flow water mist gun connecting hose and assembling method thereof
CN113464749A (en) * 2021-08-14 2021-10-01 程波 Single-ended universal joint and application method thereof

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Application publication date: 20200204