A life test device for diaphragm compressor diaphragm

Abstract

The present invention relates to a life test device for a diaphragm of a diaphragm compressor, comprising a motor, an eccentric wheel, a connecting rod, a test component and a slide rail; the test component comprises an upper end cover, a lower end cover and a diaphragm, the upper end cover and the lower end cover are connected to form a cavity therebetween, the diaphragm is installed in the cavity, an air supply hole is provided on the cavity, and a counterweight is installed on the diaphragm; the output shaft of the motor is connected to the eccentric wheel, the two ends of the connecting rod are respectively connected to the eccentric wheel and the test component, the test component is arranged on the slide rail, and as the motor works, the test component is driven by the connecting rod to slide on the slide rail. Compared with the prior art, in the present invention, the motor drives the test component to move on the slide rail through the eccentric wheel and the connecting rod, the cavity formed by the upper and lower end covers of the test component is filled with hydrogen to provide a high-pressure hydrogen environment, and a counterweight is installed on the diaphragm to provide an alternating load for the diaphragm, thereby being able to test the service life of the diaphragm subjected to the alternating load in the high-pressure hydrogen environment.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, in particular to a novel life test device for a diaphragm of a reciprocating diaphragm compressor in a hydrogen environment. Background Art

[0002] Hydrogen diaphragm compressors compress hydrogen through the reciprocating motion of a diaphragm. These diaphragms are typically made of metal and are subjected to alternating loads in high-pressure hydrogen environments. The diaphragm's resistance to hydrogen embrittlement in this environment affects its service life, a key reliability indicator for hydrogen diaphragm compressors. Therefore, testing to verify the diaphragm's service life in high-pressure hydrogen environments is crucial for hydrogen diaphragm compressor design.

[0003] The current testing methods include verifying the performance of the diaphragm during the use of the hydrogen diaphragm compressor, and installing the diaphragm in the test component, which is then placed on a vibration table for testing. Both methods have the problem of high testing costs. In addition, the diaphragm compressor of the first method may have other interfering factors, such as foreign matter in the diaphragm head and processing problems of the diaphragm head, which will affect the actual test results. The second method, due to the high price of the vibration table and the need to go to a third party for testing, the test cycle and labor costs will also be high, and it will also be inconvenient during debugging. Summary of the Invention

[0004] The purpose of the present invention is to provide a life test device for a diaphragm of a diaphragm compressor in order to overcome the defects of the prior art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A life test device for a diaphragm of a diaphragm compressor, comprising a motor, an eccentric wheel, a connecting rod, a test component and a slide rail;

[0007] The test component includes an upper end cover, a lower end cover and a diaphragm, the upper end cover and the lower end cover are connected, a cavity is formed between the upper end cover and the lower end cover, the diaphragm is installed in the cavity, an air hole is provided on the cavity, and a counterweight block is installed on the diaphragm;

[0008] The output shaft of the motor is connected to the eccentric wheel, and the two ends of the connecting rod are respectively connected to the eccentric wheel and the test component. The test component is set on the slide rail. As the motor works, the test component is driven by the connecting rod to slide on the slide rail, performing reciprocating motion with variable acceleration, and the counterweight block provides an alternating load to the diaphragm.

[0009] Preferably, a plurality of fins are mounted on the diaphragm, and the shape, position and number of the fins are determined by experimental design.

[0010] Preferably, the middle opening of the diaphragm forms a central hole, and the counterweight block is mounted on the central hole of the diaphragm through a counterweight connector.

[0011] Preferably, a sealing assembly is installed between the diaphragm and the upper end cover and the lower end cover.

[0012] Preferably, the connecting rod is connected to the lower end cover, and the upper end cover is provided with a pressure cover, which does not contact the cavity.

[0013] Preferably, the connecting rod is connected to the lower end cover, and the lower end cover is connected to the connecting rod through a joint bearing.

[0014] Preferably, a connecting plate is provided on the tested component, and a sliding component cooperating with the slide rail is provided on the connecting plate.

[0015] Preferably, a frequency converter is further included, and the frequency converter is connected to the motor.

[0016] Preferably, it further comprises a bearing seat, on which a linear bearing is provided, and the connecting rod is connected to the test component through the linear bearing.

[0017] Preferably, a synchronous connection mechanism is further included, and the motor drives multiple test components through the connecting rod and the synchronous connection mechanism, and each test component is arranged on a corresponding slide rail.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) The motor drives the test component to move on the slide rail through the eccentric wheel and the connecting rod. The cavity composed of the upper and lower end covers of the test component is filled with hydrogen to provide a high-pressure hydrogen environment. A counterweight is installed on the diaphragm to provide an alternating load for the diaphragm, thereby testing the service life of the diaphragm under alternating load in a high-pressure hydrogen environment.

[0020] (2) By adjusting the counterweight and motor, the load and frequency of the diaphragm can be changed, and the service life of the diaphragm in a high-pressure hydrogen environment under different stress levels can be tested.

[0021] (3) A pressure cover is provided to control the overall size of the device while meeting the stress requirements of the test component and saving costs.

[0022] (4) The diaphragm is provided with fins. The shape of the fins is designed to ensure that the maximum stress is near the root of the fin and is approximately in the equal stress area, which is convenient for measuring strain (calibration stress) during debugging and avoids the influence of local stress concentration on the test results.

[0023] (5) Through the synchronous connection mechanism, one motor can be connected to 2 to 3 groups of test components, and multiple groups of tests can be carried out at the same time, reducing test time and saving test costs.

[0024] (6) The structure is simple, debugging is convenient, the size is small, and each component can be flexibly replaced. The structural reliability is high, the probability of failure is low, the equipment maintenance cost is low, and the diaphragm hydrogen environment life test can be carried out at a low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 It is a schematic diagram of the overall structure of the tested component;

[0027] Figure 3 is a cross-sectional view of the tested component;

[0028] Figure 4 is the axonometric drawing of the diaphragm;

[0029] Figure numerals: 1. Motor, 2. Base, 3. Eccentric wheel, 4. Connecting rod, 5. Linear bearing, 6. Test component, 7. Connecting plate, 8. Slide rail, 9. Spherical bearing, 10. Fin, 11. Pressure cover, 12. Upper end cover, 13. Lower end cover, 14. Diaphragm, 15. Counterweight, 16. Screw, 17. Nut, 18. Connecting screw, 19. Air hole. DETAILED DESCRIPTION

[0030] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0031] In the drawings, components with identical structures are denoted by the same reference numerals, and components with similar structures or functions are denoted by similar reference numerals. The dimensions and thicknesses of each component shown in the drawings are arbitrary and are not limited by the present invention. To enhance clarity and illustrate the coordination between components, some components in the drawings are scaled, and the distances between components are increased or decreased.

[0032] In the description of the embodiments of the present application, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the application is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] Furthermore, the terms “first,” “second,” “third,” etc., are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0034] In the description of the embodiments of the present application, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0035] Example 1:

[0036] This application provides a low-cost, small-volume, easy-to-adjust, reciprocating diaphragm compressor diaphragm hydrogen environment life test device, such as Figures 1 to 4 As shown, it includes a motor 1, an eccentric wheel 3, a connecting rod 4, a test component 6 and a slide rail 8;

[0037] The test component 6 includes an upper end cover 12, a lower end cover 13 and a diaphragm 14. The upper end cover 12 and the lower end cover 13 are connected to form a cavity between the upper end cover 12 and the lower end cover 13. The diaphragm 14 is installed in the cavity. The cavity is provided with an air hole 19. A counterweight 15 is installed on the diaphragm 14.

[0038] The output shaft of the motor 1 is connected to the eccentric wheel 3 , and both ends of the connecting rod 4 are respectively connected to the eccentric wheel 3 and the tested component 6 . The tested component 6 is arranged on the slide rail 8 .

[0039] This embodiment also includes a base 2 and a bearing seat. The base 2 is used to mount and secure the motor 1. The bearing seat is provided with a linear bearing 5. One end of a connecting rod 4 is connected to the eccentric wheel 3. The other end of the connecting rod 4 is connected to the test component 6 through the linear bearing 5. The linear bearing 5 ensures that the connecting rod 4 reciprocates along a straight line. The base 2 and the bearing seat can be designed as an integrated whole to avoid installation errors and ensure the linear motion of the connecting rod 4.

[0040] The motor 1, base 2, eccentric wheel 3, connecting rod 4, and linear bearing 5 form a reciprocating motor assembly, which provides the power source for the movement of the test component 6. The reciprocating motor assembly is a crank slider mechanism. The movement characteristic of the crank slider mechanism is that the acceleration of the slider changes in a sinusoidal curve. In this application, the test component 6 is equivalent to the slider in the crank slider mechanism.

[0041] The working principle of this application is as follows: high-pressure hydrogen is filled into the cavity through the air filling hole 19, the motor 1 is connected to the test component 6 through the eccentric wheel 3 and the connecting rod 4, the output shaft of the motor 1 rotates, and the test component 6 is driven by the connecting rod 4 to perform a reciprocating motion with variable acceleration on the slide rail 8. When the motor 1 pushes the test component 6 to move, because the test component 6 is performing a reciprocating motion with variable acceleration, the counterweight 15 on the diaphragm 14 will also perform a reciprocating motion with variable acceleration due to inertia, thereby providing an alternating load to the diaphragm 14. By changing the number of counterweights 15 installed on the diaphragm 14, the load on the diaphragm 14 is changed, so that the service life of the diaphragm 14 in a high-pressure hydrogen environment under different stress levels can be tested.

[0042] The life test device further includes a frequency converter, which is connected to the motor 1 . The speed of the motor 1 can be adjusted by the frequency converter, thereby changing the load and movement frequency of the diaphragm 14 .

[0043] In this embodiment, a connecting plate 7 is provided on the tested component 6. Figure 2 As shown, the connecting plate 7 is provided with a sliding assembly that cooperates with the slide rail 8. This assembly can be constructed using a slider, guide sleeve, or other structure. The test component 6 is mounted on the slide rail 8 via the connecting plate 7 to prevent wear and tear on the test component 6 itself. The slide rail 8 has a built-in lubrication system, which reduces maintenance costs. Furthermore, the slide rail 8 has a low friction coefficient, providing support without generating excessive power consumption.

[0044] In this embodiment, the connecting rod 4 is connected to the lower end cap 13, which is in turn connected to the connecting rod 4 of the reciprocating motor assembly via a spherical plain bearing 9. The spherical plain bearing 9 is made of a self-lubricating material, which reduces maintenance costs during extended operation of the life test device. The high degree of freedom of the spherical plain bearing 9 compensates for installation errors while allowing the test assembly 6 to move along the slide rail 8 without generating additional load.

[0045] In this embodiment, the test component 6 also includes a sealing component. The hydrogenation device fills the cavity where the diaphragm 14 is provided with high-pressure hydrogen through the gas filling hole 19 to provide a high-pressure hydrogen environment for the diaphragm 14. In this embodiment, the sealing component is an O-ring. The diaphragm 14 is clamped in the middle by the upper end cover 12 and the lower end cover 13. O-rings are installed between the upper end cover 12 and the diaphragm 14 and between the lower end cover 13 and the diaphragm 14 to play a sealing role and prevent leakage of high-pressure hydrogen.

[0046] The test component 6 can withstand a pressure of not less than 45 MPa.

[0047] In this embodiment, the upper end cover 12 and the lower end cover 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. Figure 3As shown, the upper end cap 12 is mounted with a gland 11. This gland 11 does not come into direct contact with hydrogen and can be made of other materials with lower costs and higher yield strengths. Because the yield strength of 316 material is approximately 200 MPa, the upper end cap 12 must be very thick to meet the stress requirements of the test component 6. The design of the gland 11 ensures that the size of the device is controlled while meeting the stress requirements, while also saving costs. To ensure structural stability, in this embodiment, the gland 11 is also connected to the lower end cap 13 via connecting screws 18.

[0048] A plurality of fins 10 are mounted on the diaphragm 14. The shape, position and number of the fins 10 are determined by experimental design. Figure 4 As shown, the diaphragm 14 is specially designed with three fins 10 to ensure the stability of the fins 10 and prevent deflection that could affect the test. Furthermore, the shape of the fins 10 is designed to ensure that the maximum stress is near the root of the fin 10, forming a nearly constant stress area. This facilitates strain measurement (calibration stress) during commissioning and avoids the impact of localized stress concentration on test results.

[0049] The middle opening of the diaphragm 14 forms a center hole, and the counterweight block 15 is installed on the center hole of the diaphragm 14 through the counterweight connector. When the motor 1 pushes the test component 6 to move, because the test component 6 is performing a reciprocating motion with variable acceleration, the counterweight block 15 on the diaphragm 14 will also perform a reciprocating motion with variable acceleration due to inertia, thereby providing an alternating load to the diaphragm 14.

[0050] In this embodiment, the connecting parts are configured as screws 16 and nuts 17, which are convenient for replacing and adjusting the counterweight 15. The screws 16, nuts 17 for installing the counterweight 15 and the counterweight 15 itself are all made of 316 stainless steel that is resistant to hydrogen embrittlement. This ensures that during long-term testing, the counterweight 15 will not fall off due to hydrogen embrittlement, thereby affecting the test progress.

[0051] The number of counterweights 15 can be increased or decreased according to test requirements, and can be symmetrically or asymmetrically arranged on both sides of the diaphragm 14 to change the load on the diaphragm 14. This allows testing the service life of the diaphragm 14 in a high-pressure hydrogen environment at different stress levels.

[0052] Example 2:

[0053] The life test apparatus also includes a synchronous connection mechanism. The motor 1 drives multiple test components 6 via the connecting rod 4 and the synchronous connection mechanism. This allows the material of the diaphragm 14 and the number of counterweights 15 in each test component 6 to be varied. This allows the service life of diaphragms 14 made of different materials and at different stress levels in a high-pressure hydrogen environment to be verified simultaneously, thereby saving testing time. In this embodiment, the number of slide rails 8 is 2-3, and the synchronous connection mechanism is an adapter plate. The connecting rod 4 connects to the adapter plate, and each test component 6 is connected to the adapter plate via a spherical bearing 9. As in Example 1, each test component 6 is placed on a corresponding slide rail 8.

[0054] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A life test device for a diaphragm compressor diaphragm, characterized in that: Includes motor, eccentric wheel, connecting rod, test component and slide rail; The test component includes an upper end cover, a lower end cover and a diaphragm, the upper end cover and the lower end cover are connected, a cavity is formed between the upper end cover and the lower end cover, the diaphragm is installed in the cavity, an air hole is provided on the cavity, and a counterweight block is installed on the diaphragm; The output shaft of the motor is connected to the eccentric wheel, and the two ends of the connecting rod are respectively connected to the eccentric wheel and the tested component. The tested component is set on the slide rail. As the motor works, the tested component is driven by the connecting rod to slide on the slide rail, performing reciprocating motion with variable acceleration, and the counterweight block provides an alternating load to the diaphragm. A plurality of fins are mounted on the diaphragm, and the shape, position and number of the fins are determined through experimental design.

2. A life test device for a diaphragm of a diaphragm compressor according to claim 1, characterized in that: The middle opening of the diaphragm forms a central hole, and the counterweight block is installed on the central hole of the diaphragm through a counterweight connector.

3. A life test device for a diaphragm of a diaphragm compressor according to claim 1, characterized in that: A sealing assembly is installed between the diaphragm and the upper end cover and the lower end cover.

4. A life test device for a diaphragm of a diaphragm compressor according to claim 1, characterized in that: The connecting rod is connected to the lower end cover, and a pressure cover is provided on the upper end cover, and the pressure cover does not contact the cavity.

5. The life test device for a diaphragm of a diaphragm compressor according to claim 1, characterized in that: The connecting rod is connected to the lower end cover, and the lower end cover is connected to the connecting rod through a joint bearing.

6. A life test device for a diaphragm of a diaphragm compressor according to claim 1, characterized in that: The tested component is provided with a connecting plate, and the connecting plate is provided with a sliding component matched with the slide rail.

7. The life test device for a diaphragm of a diaphragm compressor according to claim 1, characterized in that: The utility model further comprises a frequency converter, wherein the frequency converter is connected to the motor.

8. The life test device for a diaphragm of a diaphragm compressor according to claim 1, characterized in that: It also includes a bearing seat, on which a linear bearing is provided, and the connecting rod is connected to the test component through the linear bearing.

9. The life test device for a diaphragm of a diaphragm compressor according to claim 1, characterized in that: It also includes a synchronous connection mechanism. The motor drives multiple tested components through the connecting rod and the synchronous connection mechanism. Each tested component is set on a corresponding slide rail.

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