Closed impeller tear strength testing machine

Abstract

The utility model belongs to the technical field of pump assembly equipment relates to a shielding sleeve bearing press -fit machine, including the press, the pressure sensor's pressure disc of integration is slid and is arranged on the press, the chuck opposite with pressure disc is provided on the base of press, the closed impeller of waiting for detecting is placed in the central hole of chuck, the upper cover, vane and lower cover of impeller distribute from top to bottom, the transmission shaft that lower cover is connected goes out the impeller, the chuck's claw contracts inwards and clamps the upper cover, the pressure disc is driven to feed down by power device, after the upper end contact of pressure disc and transmission shaft, continuously pressurizes to the vane and the upper cover or lower cover peeling off destroys. The closed impeller tear resistance detection machine provided by the utility model can quickly detect the tear resistance of impeller, and simultaneously detect the welding quality of impeller.

Description

Technical Field

[0001] This utility model belongs to the technical field of pump testing equipment, and relates to a closed impeller tear resistance testing machine. Background Technology

[0002] A closed impeller includes an upper cover, a lower cover, and blades. The blades are welded between the upper and lower covers, and a drive shaft is also connected to the axis of the lower cover. When the tear resistance of the blades and the upper and lower covers is insufficient, the impeller may develop microcracks or localized peeling under high-speed rotation or high-pressure environments. This leads to changes in the geometry of the flow channel, disrupts the ideal flow field inside the impeller, and directly affects the impeller's performance and service life. Therefore, it is necessary to test the tear resistance of closed impellers, but there is currently no equipment specifically designed for testing the tear resistance of closed impellers.

[0003] In addition, a press is an industrial device that applies controllable pressure to a workpiece through mechanical, hydraulic, or pneumatic power to achieve material forming, assembly, or performance testing. Its core function is to meet different process or testing requirements by precisely controlling the pressure magnitude, loading rate, and application time, and it is widely used in manufacturing and materials testing fields. Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies by providing a closed impeller tear resistance testing machine, which can quickly test the tear resistance of the impeller and simultaneously test the welding quality of the impeller.

[0005] To solve the above-mentioned technical problems, the objective of this utility model is achieved through the following technical solution:

[0006] A closed impeller tear resistance testing machine includes a press, a pressure plate with an integrated pressure sensor slidably mounted on the press, and a chuck opposite the pressure plate on the base of the press. The closed impeller to be tested is placed in the center hole of the chuck. The upper cover, blades, and lower cover of the impeller are distributed from top to bottom. The lower cover is connected to a drive shaft that extends upward through the impeller. The jaws of the chuck retract inward and clamp the upper cover. The pressure plate is driven downward by a power device. After the pressure plate contacts the upper end of the drive shaft, pressure is continuously applied until the blades peel off from the upper or lower cover and break.

[0007] In the aforementioned enclosed impeller tear resistance testing machine, the tear resistance refers to the magnitude of the force exerted when the blade is peeled and damaged from the upper / lower cover.

[0008] In the aforementioned enclosed impeller tear resistance testing machine, the chuck can be either a pneumatic chuck or a hydraulic chuck.

[0009] In the aforementioned closed impeller tear resistance testing machine, the inner end of the claw is provided with a longitudinally penetrating upper notch, the inner end face of the upper notch abuts against the outer peripheral surface of the upper cover, and the end of the claw below the upper notch is inserted into the blade gap between the upper and lower covers of the impeller; preferably, the upper notch is a rectangular structure penetrating longitudinally along the claw.

[0010] In the aforementioned enclosed impeller tear resistance testing machine, the claws are evenly distributed circumferentially, and their layout strictly avoids the blade installation area to ensure no interference with the blade.

[0011] In the aforementioned enclosed impeller tear resistance testing machine, the top of the claw below the upper notch abuts against the bottom surface of the upper cover and forms the lower limit structure of the upper cover.

[0012] In the aforementioned enclosed impeller tear resistance testing machine, an annular mounting seat is provided on the base, and the chuck is fixed above the mounting seat.

[0013] In the aforementioned enclosed impeller tear resistance testing machine, the mounting base is fixedly connected to the base via a chassis. The outer diameter of the mounting base is the same as the outer diameter of the chuck, and the center diameter of the mounting base is the same as the center diameter of the chuck. Both the center diameter of the mounting base and the center diameter of the chuck are larger than the outer diameter of the impeller.

[0014] In the aforementioned enclosed impeller tear resistance testing machine, a pair of columns are provided on the base, and vertical linear guide rails are laid on the inner side of the columns. The guide rail sliders of the linear guide rails are fixedly connected to both ends of the crossbeam. The pressure plate is located below the crossbeam, and the guide rail sliders are driven by a power device to drive the crossbeam to feed vertically.

[0015] In the aforementioned enclosed impeller tear resistance testing machine, the guide rail slider is driven by a motor, hydraulic mechanism, or pneumatic mechanism.

[0016] Compared with the prior art, this utility model has the following advantages:

[0017] 1. This utility model provides a closed impeller tear resistance testing machine. The upper cover is fixed by a chuck, and then pressure is applied to the lower cover, which houses the drive shaft, by a press plate. The upper and lower covers bear opposite forces until the blades detach from either the upper or lower cover and break. The real-time pressure measured by the press at this point is the impeller's tear resistance strength. Using the testing machine provided by this utility model, the tear resistance strength of the impeller can be quickly tested, providing accurate and reliable data for impeller quality inspection.

[0018] 2. This utility model can also simultaneously detect the welding quality of the impeller. After the impeller blades are separated from the upper or lower cover and damaged, the welding quality can be judged by observing the welding marks on the upper cover, lower cover and impeller. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention;

[0020] Figure 2 This is a perspective view of the impeller fixed by a chuck in this utility model;

[0021] Figure 3 yes Figure 2 A sectional view;

[0022] Figure 4 This is a perspective view of the chuck of this utility model;

[0023] Figure 5 This is a perspective view of the impeller of this utility model;

[0024] Reference numerals in the attached diagram: 1. Pressure plate; 2. Base; 3. Chuck; 4. Impeller; 5. Top cover; 6. Blade; 7. Bottom cover; 8. Drive shaft; 9. Claw; 10. Upper notch; 11. Mounting base; 12. Chassis; 13. Column; 14. Linear guide rail; 15. Guide rail slider; 16. Crossbeam. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-5 :

[0026] A closed impeller tear resistance testing machine includes a press, a pressure plate 1 with an integrated pressure sensor slidably mounted on the press, a chuck 3 opposite to the pressure plate 1 mounted on the base 2 of the press, a closed impeller 4 to be tested placed in the center hole of the chuck 3, an upper cover 5, blades 6 and a lower cover 7 of the impeller 4 distributed from top to bottom, the lower cover 7 connected to a drive shaft 8 extending upward through the impeller 4, the jaws 9 of the chuck 3 retract inward and clamp the upper cover 5, the pressure plate 1 is driven downward by a power device, after the pressure plate 1 contacts the upper end of the drive shaft 8, pressure is continuously applied until the blades 6 peel off and break from the upper cover 5 or the lower cover 7.

[0027] The testing method in this embodiment is as follows: A sample of the enclosed impeller 4 to be tested is inserted into the matching drive shaft 8. The impeller is then manually placed in the center hole of the chuck 3. The gap position of the blades 6 of the impeller 4 is observed, aligning with the jaws 9 of the chuck 3. The chuck 3 is then activated, and the jaws 9 move radially inward to clamp the impeller 4. The press is then activated, and the power unit drives the pressure plate 1 downward. After contacting the upper end of the drive shaft 8, pressure is applied to the drive shaft 8. The pressure is detected in real time by the pressure sensor of the press. The pressure is transmitted from the drive shaft 8 to the lower cover 7. Since the upper cover 5 is fixed by the chuck 3, as the pressure continues to increase, the downward force on the lower cover 7 also gradually increases. When the pressure increases to the tear load, the blades 6 peel off from the upper cover 5 / lower cover 7 and break. The force applied at this point is the tear resistance of the enclosed impeller 4.

[0028] To better secure the impeller 4, the inner end of the claw 9 is provided with a longitudinally penetrating upper notch 10. The inner end face of the upper notch 10 abuts against the outer peripheral surface of the upper cover 5. The end of the claw 9 below the upper notch 10 is inserted into the gap of the blade 6 between the upper cover 5 and the lower cover 7 of the impeller 4. Preferably, the upper notch 10 is a rectangular structure that penetrates longitudinally along the claw 9.

[0029] Preferably, the claws 9 are evenly distributed circumferentially, and their layout strictly avoids the installation area of ​​the blade 6 to ensure that there is no interference with the blade 6.

[0030] Furthermore, the top of the claw 9 below the upper notch 10 abuts against the bottom surface of the upper cover 5 and forms a lower limit structure for the upper cover 5. By setting the lower limit structure, it can be better ensured that the upper cover 5 will not move downward during detection.

[0031] To facilitate the installation of the chuck 3, an annular mounting seat 11 is provided on the base 2, and the chuck 3 is fixed above the mounting seat 11.

[0032] Furthermore, the mounting base 11 is fixedly connected to the base 2 via the chassis 12. The outer diameter of the mounting base 11 is the same as the outer diameter of the chuck 3, and the center diameter of the mounting base 11 is the same as the center diameter of the chuck 3. The center diameter of both the mounting base 11 and the chuck 3 is larger than the outer diameter of the impeller 4. This structure can prevent the impeller 4 from interfering with the annular part of the chuck 3 and the mounting base 11 when it tears, thus avoiding affecting the accuracy of the results.

[0033] In this embodiment, the specific driving structure of the pressure plate 1 is as follows: a pair of columns 13 are provided on the base 2, and vertical linear guide rails 14 are laid on the inner side of the columns 13. The guide rail sliders 15 of the linear guide rails 14 are fixedly connected to both ends of the crossbeam 16. The pressure plate 1 is located below the crossbeam 16. The guide rail sliders 15 are driven by a power device and drive the crossbeam 16 to feed vertically. The guide rail sliders 15 are driven by a motor, hydraulic mechanism or pneumatic mechanism.

[0034] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A closed impeller tear resistance testing machine, comprising a press, wherein a pressure plate (1) with an integrated pressure sensor is slidably mounted on the press, characterized in that, The press base (2) is provided with a chuck (3) opposite to the pressure plate (1). The closed impeller (4) to be tested is placed in the center hole of the chuck (3). The upper cover (5), blades (6) and lower cover (7) of the impeller (4) are distributed from top to bottom. The lower cover (7) is connected to the drive shaft (8) that extends upward through the impeller (4). The jaws (9) of the chuck (3) retract inward and clamp the upper cover (5). The pressure plate (1) is driven downward by the power device. After the pressure plate (1) contacts the upper end of the drive shaft (8), it continues to pressurize until the blades (6) peel off and break from the upper cover (5) or the lower cover (7).

2. The enclosed impeller tear resistance testing machine according to claim 1, characterized in that, The inner end of the claw (9) is provided with a longitudinal through upper notch (10). The inner end face of the upper notch (10) abuts against the outer peripheral surface of the upper cover (5). The end of the claw (9) below the upper notch (10) is inserted into the gap between the blades (6) between the upper cover (5) and the lower cover (7) of the impeller (4).

3. The enclosed impeller tear resistance testing machine according to claim 2, characterized in that, The top of the claw (9) below the upper notch (10) abuts against the bottom surface of the upper cover (5) and forms the lower limit structure of the upper cover (5).

4. The enclosed impeller tear resistance testing machine according to claim 1, characterized in that, The base (2) is provided with an annular mounting seat (11), and the chuck (3) is fixed above the mounting seat (11).

5. The enclosed impeller tear strength testing machine according to claim 4, characterized in that, The mounting base (11) is fixedly connected to the base (2) via the chassis (12). The outer diameter of the mounting base (11) is the same as the outer diameter of the chuck (3), and the center diameter of the mounting base (11) is the same as the center diameter of the chuck (3).

6. The enclosed impeller tear resistance testing machine according to claim 1, characterized in that, A pair of columns (13) are provided on the base (2). A vertical linear guide rail (14) is laid on the inner side of the column (13). The guide rail slider (15) of the linear guide rail (14) is fixedly connected to both ends of the crossbeam (16). The pressure plate (1) is located below the crossbeam (16). The guide rail slider (15) is driven by a power device and drives the crossbeam (16) to feed vertically.

Images