CN110887603A - Vacuum degree monitoring device - Google Patents

Vacuum degree monitoring device Download PDF

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Publication number
CN110887603A
CN110887603A CN201911094912.9A CN201911094912A CN110887603A CN 110887603 A CN110887603 A CN 110887603A CN 201911094912 A CN201911094912 A CN 201911094912A CN 110887603 A CN110887603 A CN 110887603A
Authority
CN
China
Prior art keywords
monitoring
vacuum
flange plate
pipe
vacuum degree
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
CN201911094912.9A
Other languages
Chinese (zh)
Inventor
刘晓军
辛海亚
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.)
Gree Electric Appliances Inc of Zhuhai
Hefei Kinghome Electrical Co Ltd
Hefei Jing Hong Electrical Co Ltd
Original Assignee
Gree Electric Appliances Inc of Zhuhai
Hefei Kinghome Electrical 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 Gree Electric Appliances Inc of Zhuhai, Hefei Kinghome Electrical Co Ltd filed Critical Gree Electric Appliances Inc of Zhuhai
Priority to CN201911094912.9A priority Critical patent/CN110887603A/en
Publication of CN110887603A publication Critical patent/CN110887603A/en
Pending legal-status Critical Current

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L21/00Vacuum gauges

Abstract

The invention provides a vacuum degree monitoring device, which comprises a vacuum gauge (100), a data transmission line (200), a vacuum gauge pipe (500) connected with the data transmission line and a monitoring object connecting pipe connected with the vacuum gauge pipe, wherein the other end of the monitoring object connecting pipe is connected with a vacuum monitoring object, a first flange plate (530) is arranged at the air inlet end (530a) of the vacuum gauge pipe, a second flange plate is arranged at the air outlet end (410a) of the monitoring object connecting pipe, the first flange plate (530) and the second flange plate (410) are tightly attached together, and a clamp (300) is fastened on the outer surface of the joint of the first flange plate and the second flange plate to fasten the joint of the first flange plate and the second flange plate.

Description

Vacuum degree monitoring device
Technical Field
The invention relates to a vacuum degree monitoring device, in particular to a vacuum degree monitoring device of a refrigerator pipeline system.
Background
The vacuum degree monitoring of the existing pipeline system generally uses a traditional pointer type vacuum gauge, the measurable range of the traditional pointer type vacuum gauge is generally 0.1Pa to 500Pa when the vacuum degree monitoring is carried out on a pipeline, the measurable range is narrow, and if the vacuum degree of the pipeline system is increased back to a larger value, the pressure sensor is easily damaged, so that the monitoring failure is caused. And the numerical precision of the vacuum degree obtained during monitoring is poor, and in some application scenes, the traditional pointer type vacuum gauge still needs unit conversion to obtain readings, so that the monitoring efficiency is low.
The vacuum degree monitoring of the refrigerator pipeline system is particularly important in the field of refrigerators, because the real vacuum degree value change of each section of the pipeline of the refrigeration system in the refrigerator can be monitored through the vacuum degree monitoring of the refrigerator system, the evacuation relation between the vacuum pumps with different evacuation speeds and the refrigerators with different inner volumes can be verified, and the method has very strong practical significance in the aspects of vacuum pump type selection, process scheme setting during evacuation and the like.
In the existing application scenario, a general connection mode when a vacuum gauge is used for monitoring the vacuum degree is that an air inlet of a vacuum pump is connected with a four-way valve, one end of the four-way valve is connected with a vacuum gauge pipe, the vacuum gauge pipe is connected with the vacuum gauge through a wire, the other end of the four-way valve is connected with a hose, and the hose is connected to a pipeline of a refrigerator through a detachable connection part. The above connection method has the following problems: (1) the position detected by the vacuum gauge is not the real vacuum degree of each position in the pipeline of the refrigeration system, but the vacuum degree value of the tail end of the hose, and the hose is different in length, so that the tail end vacuum degree value is different. (2) The vacuum gauge and the vacuum pump are connected into a whole, and the vacuum gauge cannot be directly installed and used at the position of a pipeline needing vacuum degree monitoring at each position of the refrigeration system and can directly read the value of the vacuum degree.
Disclosure of Invention
In view of the above, the present invention is directed to a vacuum degree monitoring device capable of realizing real-time vacuum degree monitoring of a pipeline system, especially a refrigerator pipeline system, and ensuring monitoring accuracy and safety of a vacuum gauge.
Specifically, the method comprises the following steps:
the invention provides a vacuum degree monitoring device, which comprises a vacuum gauge 100, a data transmission line 200, a vacuum gauge 500 connected with the data transmission line and a monitoring object connecting pipe connected with the vacuum gauge, wherein the other end of the monitoring object connecting pipe is connected with a vacuum monitoring object, and the vacuum degree monitoring device is characterized in that: a first flange plate 530 is arranged at the air inlet end 530a of the vacuum gauge pipe, a second flange plate 410 is arranged at the air outlet end 410a of the monitoring object connecting pipe, the first flange plate 530 and the second flange plate 410 are attached together in a sealing mode, and a clamp 300 is fastened on the outer surface of the joint of the first flange plate and the second flange plate to fasten the joint of the first flange plate and the second flange plate.
Preferably, the vacuum degree monitoring device further comprises a vacuum degree monitoring pipe fixedly connected to the vacuum monitoring object, and the other end of the vacuum degree monitoring pipe is detachably connected with the monitoring object connecting pipe.
Preferably, the other end of the vacuum degree monitoring pipe is detachably connected with the monitoring object connecting pipe in a male-female connection mode.
Preferably, one side of the second flange plate, which is far away from the first flange plate, is connected with a screw rod 431 with a through hole 432, one end of the screw rod 431, which is far away from the second flange plate, is provided with an outer screw rod 431, the outer screw rod 431 is provided with a clamping nut 420 in threaded engagement with the outer screw rod, the other end of the outer screw rod 431 is detachably connected with a female connector 610, and the female connector 610 is detachably connected with a male connector 620 arranged on the monitoring object connecting pipe.
Preferably, the outer diameters of the second flange 410 and the first flange 530 are the same, and are equal to phi 40.
Preferably, the second flange 410 is sealingly engaged with the first flange 530 by providing a sealing member comprising a rubber gasket 710 and a metal gasket 720.
Preferably, the rubber gasket 710 is lined with a metal gasket 720, the outer diameter of the metal gasket 720 is smaller than that of the rubber gasket 710, the metal gasket 720 is cylindrical, and the middle part of the metal gasket is concave; the rubber gasket 710 fits tightly against the flange inner concave surface and the gauge pipe inner concave surface.
Preferably, the vacuum gauge is a digital display thermocouple vacuum gauge.
The invention also relates to a refrigerator, which can be used for monitoring the vacuum degree of a refrigerator pipeline by using any vacuum degree monitoring device.
The invention can carry out whole-course monitoring on the instant vacuum degree of each part of the pipeline system of the monitored object, for example, when the vacuum degree of the pipeline system of the refrigerator is monitored, monitoring devices can be arranged on the pipeline parts at the high pressure side of the refrigerator (such as an exhaust pipe opening of a compressor and an inlet of a filter) and the pipeline parts at the low pressure side (such as the outlet end of a fin evaporator and the inlet end of an air return pipe of the compressor). When the refrigerator pipeline system is normally vacuumized by the vacuum pump, the change of the vacuum degree value at the position is immediately reflected by the digital display vacuum gauge so as to investigate whether the vacuum degree value of each point is qualified. And after the refrigerator pipeline system stops vacuumizing, the trend that the vacuum degree value at each point rises is reflected in real time so as to investigate whether the refrigerator pipeline system has no leakage point and search the optimal refrigerant filling time.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely exemplary embodiments of the present disclosure, and other drawings may be derived by those skilled in the art without inventive effort.
FIG. 1 is a table of data for monitoring vacuum level in refrigerator pipelines according to an embodiment of the present invention;
FIG. 2 is a line diagram illustrating vacuum monitoring of the refrigerator circuit according to an embodiment of the present invention;
FIG. 3 is a schematic view of a vacuum monitoring device according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of components at the connection between the vacuum gauge and the monitored portion of the refrigerator pipeline according to the embodiment of the present invention;
in the figure:
digital display thermocouple vacuum gauge-100; a data transmission line-200; a clamp hoop-300; a second flange plate-410; monitoring the air outlet end-410 a of the object connecting pipe; a clamping nut-420; screw-430; screw external thread-431; a through-hole-432;
a digital display thermocouple vacuum gauge-500; a digital display thermocouple vacuum gauge wiring cover-510; a digital display thermocouple vacuum gauge guide post-511; a digital display thermocouple vacuum gauge body-520; a first flange-530; the air inlet end-530 a of the vacuum gauge; vacuum gauge air inlet hole-531;
a female joint-610; male connector-620; a rubber gasket-710; a metal gasket-720; refrigerator line-800; refrigerator-900.
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, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and "a" and "an" generally include at least two, but do not exclude at least one, unless the context clearly dictates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
[ example 1 ]
The structure of the vacuum degree monitoring device of the embodiment example is as follows:
as shown in fig. 3, the vacuum monitoring device includes a vacuum gauge 100, a data transmission line 200, a vacuum gauge 500 connected to the data transmission line, and a monitoring object connection pipe connected to the vacuum gauge, the other end of the monitoring object connection pipe is connected to a vacuum monitoring object, a first flange 530 is disposed at an air inlet 530a of the vacuum gauge, a second flange 410 is disposed at an air outlet 410a of the monitoring object connection pipe, the first flange 530 and the second flange 410 are attached to each other in a sealing manner, and a clamp 300 is fastened to an outer surface of a connection between the first flange and the second flange to fasten a butt joint between the first flange and the second flange.
Furthermore, the vacuum degree monitoring device also comprises a vacuum degree monitoring pipe fixedly connected to the vacuum monitoring object, and the other end of the vacuum degree monitoring pipe is detachably connected with the monitoring object connecting pipe.
Furthermore, the other end of the vacuum degree monitoring pipe is detachably connected with the monitoring object connecting pipe in a male-female connection mode.
Further, the one side that first ring flange was kept away from to the second ring flange is connected with screw rod 431 that has through-hole 432, the one end that the second ring flange was kept away from to screw rod 431 is provided with the outer silk 431 of screw rod, the outer silk of screw rod is provided with in outer silk thread engagement's clamping nut 420, the other end of the outer silk 431 of screw rod can be dismantled and be connected with female joint 610, female joint 610 realizes dismantling with the male joint 620 that sets up on the monitoring object connecting pipe and is connected.
Further, the outer diameters of the second flange 410 and the first flange 530 are the same, and are phi 40.
Further, the second flange 410 and the first flange 530 are sealingly attached by providing a sealing member, which includes a rubber gasket 710 and a metal gasket 720.
Further, the rubber gasket 710 is lined with a metal gasket 720, the outer diameter of the metal gasket 720 is smaller than that of the rubber gasket 710, the metal gasket 720 is cylindrical, and the middle part of the metal gasket is concave; the rubber gasket 710 fits tightly against the flange inner concave surface and the gauge pipe inner concave surface.
The vacuum degree monitoring device provided by the invention perfectly solves the problem of low vacuum degree monitoring precision when the critical ultimate vacuum degree is reached. And the problem that the high-precision negative pressure instrument is easily impacted by high pressure to a sensing element under a normal pressure state (one atmosphere pressure) to cause the instrument to be damaged is solved by synchronous optimization.
Example of vacuum degree monitoring device specifically applied to refrigerator
In this embodiment, the application of the vacuum degree monitoring device in the field of refrigerators is described in detail by taking the above embodiment of the vacuum degree monitoring device as an example of the application of the vacuum degree monitoring device in the vacuum degree monitoring of the refrigerator pipeline system.
The overall structure is as described in embodiment 1, and is not described herein again.
Specifically, the vacuum gauge in this embodiment uses a high-precision digital display thermocouple vacuum gauge 100 to monitor the piping system of the refrigerator. The vacuum gauge adopts a digital display thermocouple vacuum gauge 100, the digital display range is 0.01 Pa-999 Pa, and the visual value error is less than or equal to 10 percent. The vacuum gauge adopts a digital display thermocouple vacuum gauge 100 which is connected with a data transmission line 200 at the tail part.
Fig. 4 is a schematic structural diagram of components at the connection between the vacuum gauge and the monitored portion of the refrigerator pipeline in this embodiment, and the vacuum degree monitoring device applied to the refrigerator in this embodiment is described with reference to fig. 3 and 4 in particular.
The data transmission line 200 is connected to a digital display thermocouple vacuum gauge wire housing 510.
The digital display thermocouple vacuum gauge pipe connection cover 510 is connected with the digital display thermocouple vacuum gauge pipe main body 520 in a wiring terminal mode, and is used for collecting instantaneous current numerical values of thermocouple resistance wires in the vacuum gauge pipe, converting the instantaneous current numerical values through a program set by a single chip microcomputer, calculating instantaneous vacuum degree numerical values and displaying the instantaneous vacuum degree numerical values in real time.
After the digital display thermocouple vacuum gauge 100 is connected with the digital display thermocouple vacuum gauge 500, a first flange plate 530 with the outer diameter of phi 40 is arranged on the surface of the air inlet end (530a) of the vacuum digital display thermocouple vacuum gauge 500, the second flange plate 410 is in butt joint with a second flange plate 410 with the outer diameter of phi 40, and the circle centers of the two flange plates are overlapped after the butt joint.
In order to prevent air leakage from the joint of the first flange 530 and the second flange 410 with the same outer diameter phi 40, a rubber gasket 710 with the outer diameter phi 38.5 is additionally used in the middle of the joint, and the rubber gasket 710 is lined with a steel metal gasket 720 with the outer diameter phi 29.5. The metal gasket 720 is cylindrical, and the middle part is concave; when the rubber gasket 710 is installed, the outer diameters of the two ports of the rubber gasket 710 are smaller, and the rubber gasket 710 is tightly matched with the inner concave surface of the second flange 410 and the inner concave surface of the second flange 410.
For the convenience of manual operation, the clip 300 is installed on the outer portion of the joint of the first flange 530, the rubber gasket 710, the metal gasket 720 and the second flange 410, the sealing rubber ring is contained in the clip, the screw for fastening on the clip 300 is manually tightened, and the rubber gasket 710 is pressed to ensure that the joint of the first flange 530, the rubber gasket 710, the metal gasket 720 and the second flange 410 is airtight.
One side of the second flange 410, which is far away from the first flange, is connected with a screw rod 431 with a through hole 432, one end of the screw rod 431, which is far away from the second flange, is provided with an outer screw rod 431, and the screw rod is further provided with a clamping nut 420. The outer thread 431 of screw rod is directly screwed to the female joint 610 that the size corresponds to after being twined with the unsintered tape, and can be dismantled with female joint 610 and be connected. The female connector 610 is detachably connected to a male connector 620 provided on a refrigerator line 800 in a compressor compartment of a refrigerator 900.
The following are examples of experiments performed by the vacuum apparatus of this example
The experimental example is an experimental numerical value when the vacuum degree monitoring device monitors the vacuum degree of the refrigerator pipeline.
The invention can carry out whole-course monitoring on the instant vacuum degree of each part of the refrigerator pipeline system, and the monitoring devices are arranged on the high-pressure side pipeline part (such as the exhaust pipe opening of a compressor and the inlet of a filter) and the low-pressure side pipeline part (such as the outlet end of a fin evaporator and the inlet end of the return pipe of the compressor) of the refrigerator. When the refrigerator pipeline system is normally vacuumized by the vacuum pump, the change of the vacuum degree value at the position is immediately reflected by the digital display thermocouple vacuum gauge so as to investigate whether the vacuum degree value of each point is qualified. And after the refrigerator pipeline system stops vacuumizing, the trend that the vacuum degree value at each point rises is reflected in real time so as to investigate whether the refrigerator pipeline system has no leakage point and search the optimal refrigerant filling time.
Has the advantages that: the vacuum degree monitoring device creatively solves the problem that the real-time vacuum degree monitoring of each part of the refrigerator pipeline system is difficult on the basis of ensuring the integrity of the components of the refrigerator pipeline system. The problem of traditional negative pressure pointer manometer or negative pressure digital display vacuum gauge adopt pressure sensor, precision is poor when direct detection low vacuum degree has been solved, the monitoring precision of vacuum degree has been improved. When the vacuum degree of the refrigerator pipeline system rises back to a larger value, the pressure sensor is prevented from being damaged, and the condition of monitoring failure is prevented. The invention can synchronously prevent the monitoring equipment from being easily damaged and increase the stability of the monitoring process of the vacuum degree monitoring device of the refrigerator pipeline system.

Claims (9)

1. The utility model provides a vacuum monitoring devices, its contains vacuometer (100), data transmission line (200), vacuum gauge (500) and the monitoring object connecting pipe of being connected with the vacuum gauge that is connected with the data transmission line, the vacuum monitoring object is connected to the other end of monitoring object connecting pipe, its characterized in that: the air inlet end (530a) of the vacuum gauge pipe is provided with a first flange plate (530), the air outlet end (410a) of the monitoring object connecting pipe is provided with a second flange plate (410), the first flange plate (530) and the second flange plate (410) are tightly attached together, and a clamp (300) is fastened on the outer surface of the joint of the first flange plate and the second flange plate to fasten the butt joint of the first flange plate and the second flange plate.
2. The vacuum level monitoring device of claim 1, wherein: the vacuum degree monitoring device also comprises a vacuum degree monitoring tube fixedly connected to the vacuum monitoring object, and the other end of the vacuum degree monitoring tube is detachably connected with the monitoring object connecting tube.
3. The vacuum level monitoring device of claim 2, wherein: the other end of the vacuum degree monitoring pipe is detachably connected with the monitoring object connecting pipe in a male-female connection mode.
4. The vacuum level monitoring device of claim 3, wherein: the one side that first ring flange was kept away from to the second ring flange is connected with screw rod (431) that have through-hole (432), the one end that the second ring flange was kept away from in screw rod (431) is provided with outer silk (431) of screw rod, the outer silk of screw rod is provided with outer screw thread engagement's clamp nut (420), the other end of outer silk (431) of screw rod can be dismantled and be connected with female joint (610), female joint (610) are realized dismantling with male joint (620) that sets up on the monitoring object connecting pipe and are connected.
5. The vacuum level monitoring device of claim 4, wherein: the outer diameters of the second flange plate (410) and the first flange plate (530) are the same and are phi 40.
6. The vacuum level monitoring device of claim 5, wherein: the second flange plate (410) and the first flange plate (530) are in sealing fit through a sealing component, and the sealing component comprises a rubber gasket (710) and a metal gasket (720).
7. The vacuum level monitoring device of claim 6, wherein: the rubber gasket (710) is lined with a metal gasket (720), the outer diameter of the metal gasket (720) is smaller than that of the rubber gasket (710), the metal gasket (720) is cylindrical, and the middle part of the metal gasket is concave; the rubber gasket (710) is tightly matched with the concave surface of the flange plate and the concave surface of the gauge pipe.
8. A vacuum level monitoring device according to any one of claims 1 to 7, wherein: the vacuum gauge is a digital display thermocouple vacuum gauge.
9. A refrigerator for performing vacuum degree monitoring of a refrigerator piping system using the vacuum degree monitoring apparatus as claimed in any one of claims 1 to 8.
CN201911094912.9A 2019-11-11 2019-11-11 Vacuum degree monitoring device Pending CN110887603A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911094912.9A CN110887603A (en) 2019-11-11 2019-11-11 Vacuum degree monitoring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911094912.9A CN110887603A (en) 2019-11-11 2019-11-11 Vacuum degree monitoring device

Publications (1)

Publication Number Publication Date
CN110887603A true CN110887603A (en) 2020-03-17

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Application Number Title Priority Date Filing Date
CN201911094912.9A Pending CN110887603A (en) 2019-11-11 2019-11-11 Vacuum degree monitoring device

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111693204A (en) * 2020-06-19 2020-09-22 四川省天域航通科技有限公司 Make things convenient for unmanned aerial vehicle of pressure sensor installation
CN112173231A (en) * 2020-08-19 2021-01-05 中国地质大学(武汉) High vacuum packaging device for powder sample

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2547991Y (en) * 2002-06-01 2003-04-30 李承韩 Pipe-to-pipe flange connecting piece
CN2777327Y (en) * 2005-03-16 2006-05-03 吕瀛 Sealing washer used for flange plate
CN2842132Y (en) * 2005-09-30 2006-11-29 Tcl集团股份有限公司 Pipeline connection joint
CN200962064Y (en) * 2006-09-27 2007-10-17 西安航空发动机(集团)有限公司 A two-purpose vacuum standard pipe interface
CN102455236A (en) * 2010-10-25 2012-05-16 北京卫星环境工程研究所 Vacuum degree measuring system and method for local position in vacuum container
KR20140045221A (en) * 2012-10-08 2014-04-16 진원삼 Equipment for protecting cold cathode vacuum gauge of sem and fib chamber
CN205639959U (en) * 2016-04-22 2016-10-12 武汉工程大学 Flange joint connects convenient to quick dismantlement
CN208281795U (en) * 2018-04-24 2018-12-25 中车长江车辆有限公司 Vacuum measuring device and cryogenic liquid storing and transporting system
EP3531096A1 (en) * 2018-02-26 2019-08-28 Vacuubrand Gmbh + Co Kg Device for measuring a gas pressure

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2547991Y (en) * 2002-06-01 2003-04-30 李承韩 Pipe-to-pipe flange connecting piece
CN2777327Y (en) * 2005-03-16 2006-05-03 吕瀛 Sealing washer used for flange plate
CN2842132Y (en) * 2005-09-30 2006-11-29 Tcl集团股份有限公司 Pipeline connection joint
CN200962064Y (en) * 2006-09-27 2007-10-17 西安航空发动机(集团)有限公司 A two-purpose vacuum standard pipe interface
CN102455236A (en) * 2010-10-25 2012-05-16 北京卫星环境工程研究所 Vacuum degree measuring system and method for local position in vacuum container
KR20140045221A (en) * 2012-10-08 2014-04-16 진원삼 Equipment for protecting cold cathode vacuum gauge of sem and fib chamber
CN205639959U (en) * 2016-04-22 2016-10-12 武汉工程大学 Flange joint connects convenient to quick dismantlement
EP3531096A1 (en) * 2018-02-26 2019-08-28 Vacuubrand Gmbh + Co Kg Device for measuring a gas pressure
CN208281795U (en) * 2018-04-24 2018-12-25 中车长江车辆有限公司 Vacuum measuring device and cryogenic liquid storing and transporting system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111693204A (en) * 2020-06-19 2020-09-22 四川省天域航通科技有限公司 Make things convenient for unmanned aerial vehicle of pressure sensor installation
CN112173231A (en) * 2020-08-19 2021-01-05 中国地质大学(武汉) High vacuum packaging device for powder sample

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