CN115406781A - A life test device for diaphragm type compressor diaphragm - Google Patents
A life test device for diaphragm type compressor diaphragm Download PDFInfo
- Publication number
- CN115406781A CN115406781A CN202210970080.8A CN202210970080A CN115406781A CN 115406781 A CN115406781 A CN 115406781A CN 202210970080 A CN202210970080 A CN 202210970080A CN 115406781 A CN115406781 A CN 115406781A
- Authority
- CN
- China
- Prior art keywords
- diaphragm
- end cover
- connecting rod
- tested
- motor
- 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
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0236—Other environments
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a life test device for a diaphragm of a diaphragm type compressor, which comprises a motor, an eccentric wheel, a connecting rod, a tested assembly and a slide rail, wherein the eccentric wheel is arranged on the motor; the tested assembly comprises an upper end cover, a lower end cover and a diaphragm, the upper end cover is connected with the lower end cover, a cavity is formed between the upper end cover and the lower end cover, the diaphragm is arranged in the cavity, an air adding hole is formed in the cavity, and a balancing weight is arranged on the diaphragm; the output shaft of motor connects the eccentric wheel, and the both ends of connecting rod are connected with eccentric wheel and tested subassembly respectively, and the subassembly that is tested sets up on the slide rail, and along with the work of motor, the subassembly that is tested is driven by the connecting rod and is slided on the slide rail. Compared with the prior art, the testing device has the advantages that the motor drives the tested assembly to move on the sliding rail through the eccentric wheel and the connecting rod, hydrogen is filled into the cavity formed by the upper end cover and the lower end cover in the tested assembly to provide a high-pressure hydrogen environment, the balancing weight is installed on the diaphragm to provide alternating load for the diaphragm, and therefore the service life of the diaphragm bearing the alternating load in the high-pressure hydrogen environment can be tested.
Description
Technical Field
The invention relates to the technical field of compressors, in particular to a novel service life testing device for a diaphragm hydrogen environment of a reciprocating motion diaphragm type compressor.
Background
The hydrogen diaphragm compressor compresses hydrogen by utilizing the reciprocating motion of a diaphragm, the diaphragm of the hydrogen diaphragm compressor is generally made of metal materials, and the diaphragm bears alternating load in a high-pressure hydrogen environment for a long time. The hydrogen brittleness resistance of the diaphragm in a high-pressure hydrogen environment influences the service life of the diaphragm, and the service life of the diaphragm is an important reliability index of the hydrogen diaphragm compressor. Tests were therefore used to verify the service life of the membrane in a high pressure hydrogen environment is very important for the design of hydrogen membrane compressors.
One of the current testing methods is to verify the performance of the membrane during the use of the hydrogen diaphragm compressor, and the other is to mount the membrane in the tested component and then place the tested component on a vibration table for testing. Both methods have a problem of high test cost. In addition, the first method may have other interference factors, such as foreign matters in the film head and processing problems of the film head, which affect the actual test effect. In the second method, the price of the vibration table is high, and a third party is required to test, so that the test period and the labor cost are high, and the debugging is inconvenient.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a life test device for a diaphragm of a diaphragm type compressor.
The purpose of the invention can be realized by the following technical scheme:
a life test device for a diaphragm of a diaphragm compressor comprises a motor, an eccentric wheel, a connecting rod, a tested component and a slide rail;
the tested assembly comprises an upper end cover, a lower end cover and a diaphragm, the upper end cover is connected with the lower end cover, a cavity is formed between the upper end cover and the lower end cover, the diaphragm is installed in the cavity, an air adding hole is formed in the cavity, and a balancing weight is installed on the diaphragm;
the output shaft of the motor is connected with the eccentric wheel, two ends of the connecting rod are respectively connected with the eccentric wheel and the tested component, the tested component is arranged on the sliding rail and driven by the connecting rod to slide on the sliding rail along with the work of the motor to do reciprocating motion with variable acceleration, and the balancing weight provides alternating load for the diaphragm.
Preferably, a plurality of fins are mounted on the membrane, and the shape, position and number of the fins are determined by experimental design.
Preferably, the center of the diaphragm is provided with a hole to form a center hole, and the balancing weight is installed on the center hole of the diaphragm through the counterweight connecting piece.
Preferably, a sealing assembly is mounted between the diaphragm and the upper and lower end caps.
Preferably, the connecting rod is connected with the lower end cover, the upper end cover is provided with a gland, and the gland is not in contact with the cavity.
Preferably, the connecting rod is connected with a lower end cover, and the lower end cover is connected to the connecting rod through a joint bearing.
Preferably, be equipped with the connecting plate on the subassembly of being examined, be equipped with on the connecting plate with slide rail complex sliding assembly.
Preferably, the motor further comprises a frequency converter, and the frequency converter is connected with the motor.
Preferably, still include the bearing frame, be equipped with linear bearing on the bearing frame, the connecting rod is connected with the subassembly under test behind the linear bearing.
Preferably, still include synchronous coupling mechanism, the motor passes through the connecting rod and drives a plurality of components under test with synchronous coupling mechanism, and every component under test sets up on corresponding slide rail.
Compared with the prior art, the invention has the following beneficial effects:
(1) The motor passes through eccentric wheel and connecting rod drive and is tried the subassembly and move on the slide rail, fills into hydrogen in the cavity that upper and lower end cover constitutes in the subassembly of being tried and provides high-pressure hydrogen environment, installs the balancing weight on the diaphragm, provides alternating load for the diaphragm to can test the life of the diaphragm that bears alternating load in the high-pressure hydrogen environment.
(2) Through adjusting balancing weight and motor, can change the load and the frequency of diaphragm, can test the life of diaphragm in high-pressure hydrogen environment under the different stress levels.
(3) The gland is arranged, the overall size of the device is controlled on the premise of meeting the stress requirement of the tested assembly, and meanwhile, the cost is saved.
(4) The fins are arranged on the diaphragm, the shape of each fin is designed to ensure that the maximum stress is close to the root of each fin and is approximate to an equal stress area, so that the strain measurement (stress calibration) during debugging is facilitated, and the influence of local stress concentration on a test result is avoided.
(5) Through synchronous connection mechanism, can connect 2 ~ 3 groups by the subassembly of being tested by a motor, can carry out the multiunit simultaneously and test, reduce test time, save test cost.
(6) The membrane hydrogen environment life test device has the advantages of simple structure, convenience in debugging, small size, high structural reliability, low probability of failure, low equipment maintenance cost and capability of flexibly replacing each component, and can realize the membrane hydrogen environment life test at low cost.
Drawings
FIG. 1 is a schematic view of the structure of the present invention;
FIG. 2 is a schematic diagram of the overall structure of the tested module;
FIG. 3 is a cross-sectional view of a tested assembly;
FIG. 4 is an isometric view of the diaphragm;
reference numerals are as follows: 1. the device comprises a motor, 2, a base, 3, an eccentric wheel, 4, a connecting rod, 5, a linear bearing, 6, a tested component, 7, a connecting plate, 8, a sliding rail, 9, a joint bearing, 10, a fin, 11, a gland, 12, an upper end cover, 13, a lower end cover, 14, a diaphragm, 15, a balancing weight, 16, a screw, 17, a nut, 18, a connecting screw, 19 and a gas filling hole.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. In order to make the drawings clearer and show the matching relationship among the components, the components are appropriately scaled and the distances among the components are increased and decreased in some places in the drawings.
In the description of the embodiments of the present application, it is to be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, refer to the orientation or positional relationship as shown in the drawings, or as conventionally placed in use of the product of the application, or as conventionally understood by those skilled in the art, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the present application.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art.
Example 1:
the application provides a low-cost, small-volume, convenient-debugging and reciprocating motion type diaphragm type compressor diaphragm hydrogen environment service life test device, which comprises a motor 1, an eccentric wheel 3, a connecting rod 4, a tested assembly 6 and a slide rail 8, wherein the motor 1, the eccentric wheel 3, the connecting rod 4, the tested assembly 6 and the slide rail 8 are shown in figures 1 to 4;
the tested assembly 6 comprises an upper end cover 12, a lower end cover 13 and a diaphragm 14, wherein the upper end cover 12 is connected with the lower end cover 13, a cavity is formed between the upper end cover 12 and the lower end cover 13, the diaphragm 14 is installed in the cavity, an air charging hole 19 is formed in the cavity, and a balancing weight 15 is installed on the diaphragm 14;
an output shaft of the motor 1 is connected with an eccentric wheel 3, two ends of a connecting rod 4 are respectively connected with the eccentric wheel 3 and a tested component 6, and the tested component 6 is arranged on a sliding rail 8.
In this embodiment, still include base 2 and bearing frame, base 2 is used for installing fixed motor 1, is equipped with linear bearing 5 on the bearing frame, and the one end and the eccentric wheel 3 of connecting rod 4 are connected, and the other end and the subassembly 6 under test of connecting rod 4 are connected behind through linear bearing 5, and linear bearing 5 sets up the assurance connecting rod 4 along straight reciprocating motion. The base 2 and the bearing seat can be integrally designed, so that installation errors are avoided, and the linear motion of the connecting rod 4 is ensured.
The working principle of this application does: high-pressure hydrogen is filled into the cavity through the air charging hole 19, the motor 1 is connected with the tested component 6 through the eccentric wheel 3 and the connecting rod 4, the output shaft of the motor 1 rotates, the tested component 6 is driven to do reciprocating motion with variable acceleration on the sliding rail 8 through the connecting rod 4, when the motor 1 pushes the tested component 6 to move, the balancing weight 15 on the diaphragm 14 can also do reciprocating motion with variable acceleration due to inertia, and therefore alternating load can be provided for the diaphragm 14. By varying the number of weights 15 mounted on the membrane 14, and thus the load on the membrane 14, the life of the membrane 14 in a high pressure hydrogen environment can be tested at different stress levels.
The life test device further comprises a frequency converter, the frequency converter is connected with the motor 1, and the motor 1 can adjust the rotating speed through the frequency converter, so that the load and the movement frequency of the diaphragm 14 can be changed.
In this embodiment, be equipped with connecting plate 7 on the subassembly 6 being tried, as shown in fig. 2, be equipped with on the connecting plate 7 with slide rail 8 complex sliding assembly, can choose for use slider, uide bushing isotructure, the subassembly 6 being tried is adorned on slide rail 8 through connecting plate 7, avoids the motion wearing and tearing to be tried subassembly 6 itself, slide rail 8 is from taking lubricating system, can reduce the maintenance cost. In addition, the sliding rail 8 has low friction coefficient, and plays a supporting role without generating excessive extra power consumption.
In this embodiment, the connecting rod 4 is connected to the lower end cap 13, and the lower end cap 13 is connected to the connecting rod 4 of the reciprocating motor assembly through the joint bearing 9. The oscillating bearing 9 is made of a self-lubricating material, so that the maintenance cost of the life test device during long-time operation can be reduced. The joint bearing 9 has high degree of freedom, can compensate installation errors, and meanwhile enables the tested assembly 6 to move along the direction of the sliding rail 8 without generating additional load.
In this embodiment, the tested assembly 6 further includes a sealing assembly, the hydrogenation apparatus fills high-pressure hydrogen into the cavity provided with the membrane 14 through the gas filling hole 19, and provides a high-pressure hydrogen environment for the membrane 14, the sealing assembly in this embodiment is an O-ring, the membrane 14 is clamped between the upper end cover 12 and the lower end cover 13, and the O-rings are arranged between the upper end cover 12 and the membrane 14 and between the lower end cover 13 and the membrane 14, so that a sealing effect can be achieved, and leakage of high-pressure hydrogen is prevented.
The tested member 6 can withstand a pressure of not less than 45 MPa.
In this embodiment, the upper end cap 12 and the lower end cap 13 are both made of 316 stainless steel, which is a hydrogen embrittlement resistant material, and can ensure the safety of the pressure vessel during the test. In this embodiment, as shown in fig. 3, the upper end cap 12 is provided with the gland 11, and the gland 11 is not directly contacted with hydrogen, and other materials with lower cost and higher yield strength can be used. Because the yield strength of the 316 material is about 200MPa, if the stress requirement of the tested assembly 6 is to be met, the upper end cover 12 needs to be made very thick, the design of the gland 11 ensures that the size of the equipment is controlled under the condition that the stress is met, and meanwhile, the cost is saved. In order to ensure the structural stability, in the present embodiment, the gland 11 is further connected to the lower end cap 13 by a connecting screw 18.
The membrane 14 is provided with a plurality of fins 10, and the shape, position and number of the fins 10 are determined by experimental design. In this embodiment, as shown in fig. 4, through a special design, the diaphragm 14 has 3 fins 10, so that the stability of the fins 10 is ensured, and the test is not influenced by deflection. In addition, the shape of the fin 10 is designed to ensure that the maximum stress is near the root of the fin 10 and is approximate to an equal stress area, so that the strain measurement (stress calibration) during debugging is facilitated, and the influence of local stress concentration on a test result is avoided.
The center of the diaphragm 14 is provided with a central hole, the counterweight 15 is installed on the central hole of the diaphragm 14 through a counterweight connecting piece, when the motor 1 pushes the tested component 6 to move, because the tested component 6 does reciprocating motion with variable acceleration, the counterweight 15 on the diaphragm 14 also does reciprocating motion with variable acceleration due to inertia, and thus, alternating load can be provided for the diaphragm 14.
In this embodiment, the configuration connecting member is a screw 16 and a nut 17, so that the counterweight block 15 can be conveniently replaced and adjusted, and the screw 16, the nut 17 and the counterweight block 15 for mounting the counterweight block 15 are all made of a hydrogen embrittlement resistant 316 stainless steel material, so that the counterweight block 15 is prevented from falling off due to hydrogen embrittlement during a long-term test process, thereby influencing the test process.
According to the needs of experiments, the number of the balancing weights 15 can be increased or decreased, and the balancing weights can be symmetrically or asymmetrically arranged on two sides of the diaphragm 14, so that the load of the diaphragm 14 can be changed. This allows testing of the service life of the diaphragm 14 in a high pressure hydrogen environment at different stress levels.
Example 2:
the life test device also comprises a synchronous connecting mechanism, the motor 1 drives a plurality of tested assemblies 6 through the connecting rod 4 and the synchronous connecting mechanism, so that the material of the membrane 14 and the number of the balancing weights 15 can be changed in each tested assembly 6, the service life of the membrane 14 in a high-pressure hydrogen environment under different materials and different stress levels can be verified at the same time, and the test time is saved. In this embodiment, the number of the slide rails 8 is 2 to 3, the synchronous connection mechanism is an adapter plate, the connecting rod 4 is connected with the adapter plate, each tested component 6 is connected with the adapter plate through a joint bearing 9, and like embodiment 1, each tested component 6 is arranged on the corresponding slide rail 8.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the above teachings. Therefore, the technical solutions that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection determined by the claims.
Claims (10)
1. A life test device for a diaphragm of a diaphragm type compressor is characterized by comprising a motor, an eccentric wheel, a connecting rod, a tested component and a slide rail;
the tested assembly comprises an upper end cover, a lower end cover and a diaphragm, the upper end cover is connected with the lower end cover, a cavity is formed between the upper end cover and the lower end cover, the diaphragm is installed in the cavity, an air adding hole is formed in the cavity, and a balancing weight is installed on the diaphragm;
the output shaft of the motor is connected with the eccentric wheel, two ends of the connecting rod are respectively connected with the eccentric wheel and the tested component, the tested component is arranged on the sliding rail and driven by the connecting rod to slide on the sliding rail along with the work of the motor to do reciprocating motion with variable acceleration, and the balancing weight provides alternating load for the diaphragm.
2. The life test device for a diaphragm of a diaphragm type compressor according to claim 1, wherein a plurality of fins are installed on the diaphragm, and the shape, position and number of the fins are determined by a test design.
3. The life test device for diaphragm of diaphragm compressor as claimed in claim 1, wherein the center hole of the diaphragm forms a center hole, and the weight is mounted on the center hole of the diaphragm through a weight connector.
4. The life test apparatus for a diaphragm of a diaphragm type compressor according to claim 1, wherein a sealing assembly is installed between the diaphragm and the upper and lower caps.
5. The life test device for diaphragm of diaphragm compressor as claimed in claim 1, wherein said connecting rod is connected to a lower end cap, and said upper end cap is provided with a gland which is not in contact with the chamber.
6. The apparatus of claim 1, wherein the connecting rod is connected to a lower end cap, and the lower end cap is connected to the connecting rod through a knuckle bearing.
7. The life test device for the diaphragm of the diaphragm type compressor according to claim 1, wherein a connecting plate is provided on the tested component, and a sliding component matched with the sliding rail is provided on the connecting plate.
8. The apparatus of claim 1, further comprising a frequency converter, wherein the frequency converter is connected to the motor.
9. The life test device for the diaphragm of the diaphragm type compressor according to claim 1, further comprising a bearing seat, wherein a linear bearing is arranged on the bearing seat, and the connecting rod is connected with the tested component through the linear bearing.
10. The life test device for the diaphragm of the diaphragm type compressor according to claim 1, further comprising a synchronous connection mechanism, wherein the motor drives a plurality of tested components through the connecting rod and the synchronous connection mechanism, and each tested component is arranged on the corresponding slide rail.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210970080.8A CN115406781A (en) | 2022-08-12 | 2022-08-12 | A life test device for diaphragm type compressor diaphragm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210970080.8A CN115406781A (en) | 2022-08-12 | 2022-08-12 | A life test device for diaphragm type compressor diaphragm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115406781A true CN115406781A (en) | 2022-11-29 |
Family
ID=84160458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210970080.8A Pending CN115406781A (en) | 2022-08-12 | 2022-08-12 | A life test device for diaphragm type compressor diaphragm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115406781A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116181632A (en) * | 2022-12-01 | 2023-05-30 | 上海羿弓氢能科技有限公司 | Electromagnetic excitation type diaphragm compressor diaphragm hydrogen environment life test device |
| CN116256163A (en) * | 2023-04-25 | 2023-06-13 | 中鼎恒盛气体设备(芜湖)股份有限公司 | Life test device for diaphragm production of diaphragm compressor |
-
2022
- 2022-08-12 CN CN202210970080.8A patent/CN115406781A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116181632A (en) * | 2022-12-01 | 2023-05-30 | 上海羿弓氢能科技有限公司 | Electromagnetic excitation type diaphragm compressor diaphragm hydrogen environment life test device |
| CN116181632B (en) * | 2022-12-01 | 2023-10-13 | 上海羿弓氢能科技有限公司 | Electromagnetic excitation type diaphragm compressor diaphragm hydrogen environment life test device |
| CN116256163A (en) * | 2023-04-25 | 2023-06-13 | 中鼎恒盛气体设备(芜湖)股份有限公司 | Life test device for diaphragm production of diaphragm compressor |
| CN116256163B (en) * | 2023-04-25 | 2023-08-11 | 中鼎恒盛气体设备(芜湖)股份有限公司 | Life test device for diaphragm production of diaphragm compressor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN115406781A (en) | A life test device for diaphragm type compressor diaphragm | |
| CN111927752B (en) | Diaphragm compressor fault diagnosis instrument | |
| CN207866474U (en) | A kind of compressed spring fatigue tester | |
| US20230313792A1 (en) | Plunger pump and pump station | |
| CN106226005B (en) | Gas meter, flow meter valve deck, seat leakage detection device | |
| CN115165538A (en) | Intrinsically safe multifunctional high-pressure hydrogen environment material friction wear in-situ testing device | |
| CN111504568A (en) | Detection device | |
| CN109013258A (en) | A kind of low-frequency sound pressure generating device | |
| CN211234270U (en) | Polymer lithium battery detection mechanism | |
| CN109932626B (en) | Current-carrying friction wear test device and method for contact point of gas insulated bus | |
| CN111504569A (en) | Detection device | |
| CN213275862U (en) | Low, normal and high temperature test system for TO optical communication device | |
| CN208727932U (en) | A kind of low-frequency sound pressure generating device | |
| CN205103223U (en) | Dissolved gas concentration calibrating installation in movable's oil | |
| CN114279610B (en) | Device and method for measuring specific pressure of mechanical seal end face of turbopump of liquid rocket engine | |
| CN115078149B (en) | High-frequency fretting corrosion wear testing machine | |
| CN114543383B (en) | Piston displacement measuring device and free piston Stirling refrigerator | |
| CN214577772U (en) | Mechanical seal leakage testing tool for high-speed centrifugal pump | |
| Baumann | Design Features of A Small Oilfree, Reciprocating, High Pressure Compressor | |
| CN216869895U (en) | Axial force balancing device | |
| CN2766077Y (en) | Apparatus for measuring axial position of balancing disc for pump | |
| KR100243941B1 (en) | An apparatus for testing the friction and the abrasion of a ball bearing in the compressor | |
| CN220751510U (en) | Engine water pump airtight test tool convenient to it is fixed | |
| CN114839406B (en) | Feeder terminal testing arrangement | |
| CN214471741U (en) | Experimental equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |