Micromotor sealing performance test tool

Abstract

The utility model relates to the technical field of micromotor testing, and discloses a micromotor sealing performance testing tool which comprises a sealing mechanism and a testing mechanism, the testing mechanism is used for pouring a testing medium into a micromotor, a second butt joint piece is provided with a cavity with an opening, a sealing piece is located in the cavity, and a second butt joint piece is located in the cavity. One end of the first butt joint piece is suitable for extending into the cavity to extrude the sealing piece; the first butt-joint piece is provided with a through hole penetrating through the axial direction of the first butt-joint piece, in the testing process, the front end of the micromotor penetrates through the through hole to enter the cavity, the first butt-joint piece and / or the second butt-joint piece extrudes the sealing piece, the gap between the micromotor and the cavity is filled with the sealing piece, and therefore the micromotor can be tested. A sealing space is formed at the front end of the micromotor, leakage of a test medium can be prevented, the sealing condition of the front end of the micromotor is simulated, the test efficiency and accuracy are improved, and the risk of leakage of the micromotor in practical application is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of micro motor testing, and further to a micro motor sealing test tool. Background Art

[0002] As one of the treatment methods for end-stage heart failure and cardiogenic shock, interventional catheter pumps are characterized by low trauma and low surgical risk. They restore heart function without causing physical damage to the heart, and have a good therapeutic effect on high-risk patients. The micromotor is the core component of the entire left ventricular assist catheter pump. Its function is to drive the impeller to generate pressure through high-speed rotation, pumping blood from the left ventricle into the aorta, thereby ensuring that heart failure patients can still produce the circulating blood flow required by the human body in the case of insufficient heart function, and maintain the vital signs of heart failure patients. If the sealing performance of the micromotor does not meet the requirements, it will easily affect the normal treatment process, so the detection of the micromotor is very important.

[0003] However, due to the complex internal structure of the motor, the leakage of the motor can only be detected by injecting liquid into the motor through the perfusion pipeline. The current tooling used to detect the sealing of the micromotor still has problems. For example, during the test, the gap between the bearing and the shaft at the front end of the motor is not sealed, so the injected test medium may also flow back into the motor through this gap. Not only can the test results not be obtained correctly, but it is also easy to damage the motor.

[0004] In summary, this testing technology needs to be improved to address current problems. Utility Model Content

[0005] In view of the above technical problems, the purpose of the present application is to provide a micromotor sealing performance testing tool, which can improve the accuracy of the sealing performance test of the micromotor and help ensure that the micromotor can meet the expected sealing requirements in actual applications.

[0006] In order to achieve the above-mentioned purpose, the present application provides a micromotor sealing performance testing tool, comprising:

[0007] A sealing mechanism, comprising a first docking member, a second docking member and a sealing member,

[0008] The second docking member has an open cavity, the sealing member is located in the cavity, and one end of the first docking member is suitable for extending into the cavity to squeeze the sealing member;

[0009] The first docking member has a through hole running through the axial direction thereof. During the test, the front end of the micromotor passes through the through hole and enters the chamber. The first docking member and / or the second docking member squeeze the sealing member so that the sealing member fills the gap between the micromotor and the chamber to form a sealed space at the front end of the micromotor.

[0010] The testing mechanism is used for injecting a testing medium into the micromotor.

[0011] It is worth mentioning that in the present application, the seal can be squeezed by the movable first docking piece, so that it is deformed. The deformed seal seals the gap at the front end of the micromotor, which is helpful to prevent the test medium (perfusion fluid) from flowing back, so that the test fixture in the present application can ensure that the micromotor can provide stable performance and reliable sealing in actual applications.

[0012] In some embodiments, the first docking member includes an operating portion and a connecting portion, the operating portion and the connecting portion are connected to each other, and the through hole penetrates the operating portion and the connecting portion at the same time;

[0013] The connecting portion and the chamber are matched to each other so that the connecting portion can extend into the chamber and move along the extending direction of the chamber.

[0014] It can be understood that the operating part can provide an operator or tester with a position on the first docking part that is easy to manipulate. At the same time, this position can also cooperate with several other parts to achieve the purpose of preventing slipping, while the connecting part is responsible for cooperating and connecting with the second docking part and squeezing the seal, so that the user's operation process and the squeezing process of the seal are not prone to conflict.

[0015] In some embodiments, the peripheral wall of the connecting portion is provided with an external thread, and the peripheral wall of the chamber is provided with an internal thread to form a threaded movable connection between the first docking member and the second docking member, so that the first docking member can adjust its relative position with the sealing member by a screwing operation.

[0016] By setting up this threaded movable connection form, the operator can adjust the position of the first docking piece by simply twisting it, so that the sealing piece is deformed after being squeezed, thereby achieving the effect of sealing the front end of the micromotor, and the operation is simple and easy to use; and the threaded connection form is more conducive to locking the position of the first docking piece, without the need to additionally set up a locking mechanism or a limiting mechanism, which can simplify the structure of the tooling and reduce costs.

[0017] In some embodiments, the depth of the chamber is at least equal to the height of the sealing member, and the sealing member is connected to or detachably connected to the chamber;

[0018] The sealing member has a tubular profile, and the inner diameter of the sealing member is slightly smaller than the outer diameter of the micromotor, so that during the test process, the sealing member can be nested in the outer periphery of the micromotor.

[0019] It should be noted that the seal and the chamber can be designed as a separate part or an integrated part. The separate part is convenient for replacing or repairing the seal, while the integrated part can enhance the firmness of the seal and prevent the seal from being accidentally lost. Of course, it also plays a certain role in limiting the position. In addition, the inner diameter of the seal is slightly smaller than the outer diameter of the micromotor. The slightly smaller inner diameter can provide a certain friction force to prevent the micromotor from detaching from the seal due to vibration or rotation during the test.

[0020] In some embodiments, a micromotor limiting portion is provided at the bottom of the chamber, and the inner contour of the micromotor limiting portion is matched with the outer contour of the micromotor front end structure for accommodating and positioning the micromotor front end structure.

[0021] Here, the front end structure of the micromotor is accommodated by the limiting portion at the bottom of the chamber, providing a precise positioning and support point for the front end of the micromotor, ensuring that it will not move or be damaged during the test, further enhancing the functionality of the test fixture and the stability of the micromotor during the test.

[0022] In some embodiments, the micromotor sealing test tool further includes a base, the base is provided with at least one mounting position, and the second docking member can be fixedly or detachably connected to the mounting position.

[0023] It can be understood that by providing a base to provide a stable support platform for the second docking member, it is possible to prevent the second docking member from being separated from the base due to vibration or rotation during the test, thereby ensuring the stability of the test.

[0024] In some embodiments, the base further comprises at least one bottom plate which is slidably arranged, and a sliding groove adapted to the bottom plate, and the bottom plate can be operated to slide in the corresponding sliding groove;

[0025] A plurality of the mounting positions are arranged on one bottom plate, and the mounting positions are evenly distributed along the extension direction of the bottom plate.

[0026] In some embodiments, a limit rib is provided on the base, and the limit rib is located at the opening end of the sliding groove and partially exceeds the side wall of the sliding groove, so as to prevent the bottom plate from falling out of the sliding groove.

[0027] In some embodiments, the testing mechanism includes a pressure charging device and a pressure gauge;

[0028] The charging device is connected to the perfusion pipeline leading out from the tail end of the micromotor, so that the test medium is injected into the micromotor through the perfusion pipeline, and the test medium fills the sealed space during the test; the pressure gauge is used to read the pressure value in the sealed space.

[0029] It should be noted that by injecting the test medium into the micromotor through the pressure charging device and reading the pressure value in the sealed space with the pressure gauge, the pressure change of the test medium can be monitored in real time to evaluate the sealing performance of the micromotor.

[0030] In some embodiments, the testing mechanism further comprises a branch joint, wherein the branch joint has at least one main interface and at least two branch interfaces, wherein the main interface is used to connect a pipeline leading out from the charging device, and the branch interface is used to connect the perfusion pipeline;

[0031] Among the branch interfaces, at least one branch interface has a diameter different from that of the other branch interfaces, so as to be adapted to the perfusion pipelines with different diameters.

[0032] It can be understood that the branch joint serves as a connecting component, allowing the charging device in the present application to be connected to the perfusion pipelines of different diameters, thereby increasing the applicability of the test tool.

[0033] Compared with the prior art, the micromotor sealing test tool provided in this application has the following beneficial effects:

[0034] 1. In the micromotor sealing test tool provided by the present application, during the test process, the user can operate the first docking piece or the second docking piece or both at the same time to squeeze the seal, and the seal fills the gap between the micromotor and the chamber through its elastic deformation, so that a closed space is formed at the front end of the micromotor to prevent leakage of the test medium; then the test mechanism is responsible for injecting the test medium into the micromotor to simulate the fluid environment under actual working conditions, thereby forming a set of efficient and simple test tooling, which reduces costs while ensuring the test quality.

[0035] 2. The present application also enables the first docking part and the second docking part to be tightly connected together through a threaded movable connection form; at the same time, a certain degree of adjustability is allowed. The operator can perform a screwing operation, such as screwing the first docking part, so that the first docking part can move toward the sealing part, so that the sealing part can be squeezed, thereby achieving the elastic deformation of the sealing part in the above content.

[0036] 3. In the present application, the seal is set to be tubular, and the inner diameter of the seal is slightly smaller than the outer diameter of the micromotor. The slightly smaller inner diameter allows the seal to be tightly nested in the outer periphery of the micromotor to form an effective sealing space, while providing a certain friction force to prevent the micromotor from detaching from the seal due to vibration or rotation during the test, thereby ensuring the accuracy of the test.

[0037] 4. The present application accommodates the rotating shaft at the front end of the micromotor through the slot design at the bottom of the chamber, providing a precise positioning and support point for the rotating shaft, ensuring that the rotating shaft will not move or be damaged during the test, thereby improving the practicality of the micromotor sealing performance test tooling and the stability of the micromotor during the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The preferred implementation scheme will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present application.

[0039] Figure 1 is a schematic cross-sectional structure diagram of a micromotor in one embodiment of the present application;

[0040] Figure 2 is a cross-sectional view of the overall structure of an embodiment of the present application;

[0041] Figure 3 is a schematic cross-sectional structure diagram of a second docking member in one embodiment of the present application;

[0042] Figure 4 It is a structural schematic diagram of an embodiment of the present application;

[0043] Figure 5 It is a partial structural exploded diagram of an embodiment of the present application;

[0044] Figure 6 It is a schematic diagram of the overall structure of one of the embodiments of the present application.

[0045] Explanation of the accompanying drawings: micromotor 1; high-pressure tube 11; bearing upper end cover 12; bearing lower end cover 13; rolling bearing 14; magnetic steel 15; coil 16; front end cover 17; rotating shaft 18; PCB board 19; first docking piece 2; through hole 20; operating part 21; connecting part 22; second docking piece 3; chamber 30; accommodating groove 301; positioning groove 302; sealing member 4; base 5; sliding groove 50; bottom plate 51; limiting retaining edge 52; charging device 6; pressure gauge 7; perfusion pipeline 8; branch joint 9. DETAILED DESCRIPTION

[0046] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the specific implementation methods of the present application will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0047] In order to simplify the drawings, only the parts related to the application are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0048] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0049] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element 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.

[0051] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0052] First, please refer to the instruction manual Figure 1This is an internal structure diagram of a micromotor 1 used in a ventricular assist device. The micromotor 1 is the core component of the entire left ventricular assist catheter pump. This has been explained in the previous text and will not be repeated here. It is understandable that in order to cooperate with the treatment process, the micromotor 1 needs to be placed in the aorta and in direct contact with the blood. In addition to requiring the shell surface to be smooth and the material to have good biocompatibility, the micromotor 1 also needs good sealing. If the motor structure is not completely sealed, the perfusion pressure required during the use of the device will be difficult to meet. On the one hand, it affects the delivery of the perfusion fluid and the monitoring of the perfusion pressure during the use of the device. On the other hand, due to the high blood pressure in the aorta, the blood will be inverted into the motor, forming a thrombus and causing the motor to stop.

[0053] The perfusion liquid generally enters the upper end cover 12 and the lower end cover 13 of the bearing from the high-pressure pipe 11, enters the space between the magnet 15 and the coil 16 through the bearing gap of the rolling bearing 14, and then flows out of the motor through the gap between the front cover 17 and the rotating shaft 18. Similarly, in the human body environment, blood may also flow back into the motor through this path. If the bearing end cover is not completely sealed, for example, the path where the coil lead wire is connected to the PCB board 19 is not completely sealed, blood will enter the tail of the motor along this path, and then enter the handle (an external junction box for line transfer) through the cable conduit, corroding the electronic components in the handle, and then causing the pump to stop, affecting the safety of the device.

[0054] Therefore, the sealing performance of the micromotor 1 needs to be tested before it is officially used, and it can be used only when it meets the requirements to prevent the above problems from occurring.

[0055] In one embodiment, the reference specification Figure 2 The micromotor sealing test tool provided in the present application is intended to improve the accuracy of the micromotor sealing performance test, which helps to ensure that the micromotor 1 can meet the expected sealing requirements in actual applications and avoid the occurrence of the above-mentioned problems.

[0056] Reference Manual Attached Figure 2 and Figure 3 As shown, a micromotor sealing test tool provided in the present application includes a sealing mechanism and a testing mechanism, wherein the sealing mechanism includes a first docking member 2, a second docking member 3 and a sealing member 4, and the testing mechanism is used to inject a test medium into the micromotor 1.

[0057] More specifically, the first docking member 2 has a through hole 20 extending axially therethrough. In addition, the second docking member 3 has an open chamber 30 . The sealing member 4 is disposed in the chamber 30 . The micromotor 1 can extend into the chamber 30 through the through hole 20 .

[0058] During the test, the second docking member 3 is sleeved on the outer periphery of the first docking member 2, and the first docking member 2 and / or the second docking member 3 squeeze the sealing member 4 so that the sealing member 4 fills the gap between the micromotor 1 and the chamber 30 after being squeezed to form a sealed space at the front end of the micromotor 1.

[0059] In this embodiment, the sealing mechanism is responsible for forming a sealed space, while the testing mechanism is responsible for injecting a testing medium into the micromotor 1 , and the two work together to simulate the working environment of the micromotor 1 .

[0060] Specifically, the seal 4 is deformed after being squeezed, and the deformed seal 4 seals the gap at the front end of the micromotor 1, which is beneficial to prevent the test medium (perfusion liquid) from flowing back. Therefore, the design of the micromotor sealing test tooling in the present application is more reasonable, and can ensure that the micromotor 1 can provide stable performance and reliable sealing in actual applications.

[0061] In addition, the material selection for the seal 4 also needs to be considered. The seal 4 needs to be able to withstand a certain pressure while maintaining good elasticity and having a certain wear resistance, so as to prevent the seal 4 from excessive wear, fatigue fracture, etc. during repeated testing.

[0062] Furthermore, the design in this embodiment can simulate the sealing condition of the front end of the micromotor 1 , and reduce the risk of leakage of the micromotor 1 in actual application by discovering and solving the sealing problem in the test phase.

[0063] In one embodiment, based on the above embodiment, the first docking member 2 includes an operating portion 21 and a connecting portion 22, the operating portion 21 and the connecting portion 22 are connected to each other, and the through hole 20 penetrates both the operating portion 21 and the connecting portion 22. The connecting portion 22 and the chamber 30 are matched so that the connecting portion 22 can extend into the chamber 30 and move along the extension direction of the chamber 30.

[0064] It can be understood that the operating part 21 can provide an operator or tester with a convenient operating position on the first docking part 2, while the connecting part 22 is responsible for cooperating and connecting with the second docking part 3 and squeezing the seal 4, so that the user's operating process and the squeezing process of the seal 4 are not prone to conflict.

[0065] At the same time, a number of anti-skid grooves can be provided on the operating part 21, or some silicone rings or anti-skid rings can be used to prevent slipping; moreover, a certain depression can be provided on the operating part 21 to match the curvature of the operator's fingers, so that the operator can operate the first docking member 2 more smoothly and with less effort.

[0066] In another embodiment, the peripheral wall of the connection portion 22 is provided with an external thread, and the peripheral wall of the chamber 30 is provided with an internal thread to form a threaded movable connection between the first docking member 2 and the second docking member 3, so that the first docking member 2 can adjust its relative position with the sealing member 4 by a screwing operation.

[0067] By setting up this threaded movable connection form, the operator can adjust the position of the first docking member 2 by simply twisting it, so that the sealing member 4 is deformed after being squeezed, thereby achieving the effect of sealing the front end of the micromotor 1, and the operation is simple and easy to use.

[0068] Moreover, the threaded connection can provide a higher positioning accuracy, which is more conducive to locking the position of the first docking member 2, without the need to set up an additional locking mechanism or a limiting mechanism, which can simplify the structure of the tooling and reduce costs. In addition, the threaded connection can be reused without loosening, which allows the position of the first docking member 2 to be adjusted and fixed multiple times during the test process without affecting the stability of the connection, and can still maintain close contact between the two docking members under a large load.

[0069] In one embodiment, the depth of the chamber 30 is at least equal to the height of the sealing member 4 , and the sealing member 4 is connected to the chamber 30 or can be separated from the chamber 30 .

[0070] Moreover, in the present application, the seal 4 is configured to have a tubular profile, and the inner diameter of the seal 4 is slightly smaller than the outer diameter of the micromotor 1, so that during the test, the seal 4 can be nested in the outer periphery of the micromotor 1. In addition, the inner diameter of the seal 4 is slightly smaller than the outer diameter of the micromotor 1, and the slightly smaller inner diameter can provide a certain friction force to prevent the micromotor 1 from being separated from the seal 4 due to vibration or rotation during the test.

[0071] Based on the above content, it can be known that the seal 4 and the chamber 30 can be a split design or an integrated design. The split design allows the seal 4 to be independently replaced or adjusted. The user can replace or adjust the seal 4 according to the test requirements, ensuring that the test tooling can adapt to different test conditions, thereby improving the flexibility and maintainability of the test tooling; and the above-mentioned integrated design can enhance the firmness of the seal 4 and prevent the seal 4 from being accidentally lost. Of course, it also simplifies the structure, reduces the number of components, and improves the stability and reliability of the test tooling.

[0072] In another embodiment of the present application, a micromotor limiting portion is provided at the bottom of the chamber 30. The micromotor limiting portion is a hollow structure whose contour is adapted to the front end structure of the micromotor, thereby being able to accommodate and position the front end structure of the micromotor, thereby ensuring the precise positioning and stability of the micromotor 1 during the test process.

[0073] On the basis of the above embodiment, the micromotor limiting portion includes a receiving groove 301 and a positioning groove 302. At the same time, it can be known that the front end structure of the micromotor 1 includes a front end cover 17, a rotating shaft 18 (such as Figure 1 The opening diameter of the receiving groove 301 matches the diameter of the shaft of the micromotor 1 . The receiving groove 301 is used to receive and limit the shaft, so that when the front end of the micromotor 1 is close to the bottom of the chamber 30 , the shaft can be embedded in the receiving groove 301 .

[0074] Here, the slotted design at the bottom of the chamber 30 is used to accommodate the rotating shaft 18 at the front end of the micromotor 1, providing a precise positioning and support point for the rotating shaft 18, ensuring that the rotating shaft 18 will not move or be damaged during the test, further enhancing the functionality of the test tooling and the stability of the micromotor 1 during the test.

[0075] Furthermore, the positioning groove 302 in the micromotor limiting part is designed to receive the front end cover 17 of the micromotor 1, ensuring the stability of the front end cover 17 of the micromotor 1 during the test. The positioning groove 302 is connected with the receiving groove 301 to form a unified limiting system, which not only enhances the stability of the micromotor 1 during the test, but also effectively avoids the test error caused by the misalignment or rotation of the micromotor 1. Through this design, the micromotor limiting part can ensure that the front end cover 17 and the rotating shaft 18 of the micromotor 1 always maintain the correct position during the test, thereby improving the accuracy and repeatability of the test.

[0076] In addition, the design of the micromotor limiter also simplifies the installation and fixing process of the micromotor 1, making the operation of the equipment more convenient and the maintenance more efficient. It solves the problem of unstable positioning and easy dislocation of the micromotor 1 in the prior art, significantly improves the performance and reliability of the micromotor testing equipment, and helps to improve product quality and production efficiency.

[0077] In one embodiment, the reference specification Figure 4 and Figure 5 The micromotor sealing test tool further includes a base 5, the base 5 is provided with at least one mounting position, and the second docking member 3 can be fixedly or detachably connected to the mounting position.

[0078] It can be understood that by providing the base 5 to provide a stable support platform for the second docking member 3, the second docking member 3 can be prevented from being separated from the base 5 due to vibration or rotation during the test, thereby ensuring the stability of the test. Moreover, the number of mounting positions provided on the base 5 is not limited in this embodiment, as long as it can meet the actual test requirements, and the arrangement of the mounting positions can be various forms such as multiple rows and multiple columns, single row and multiple columns, and multiple rows and single column.

[0079] It should also be noted that the docking method between the second docking member 3 and the mounting position is generally a detachable connection. If the second docking member 3 is damaged or needs to be replaced during the test, the detachable connection method can be easily replaced. However, in other embodiments, the second docking member 3 can also be directly fixed in the mounting position. Of course, the style of the mounting position is not shown in the accompanying drawings. We can assume that the second docking member 3 in the accompanying drawings is directly embedded in the mounting position, thereby forming an integrated structure with the base 5.

[0080] Furthermore, Figure 5 As shown, the base 5 also includes at least one sliding bottom plate 51, that is, the bottom plate 51 can slide in the sliding groove 50. A plurality of mounting positions are arranged on one bottom plate 51, and the mounting positions are evenly arranged along the extension direction of the bottom plate 51, so that the base 5 can evenly distribute the load, thereby improving the stability and reliability of the test fixture.

[0081] In addition, the bottom plate 51 is slidably arranged here, so that after the operator slides the bottom plate 51, the second docking member 3 can be easily moved along the extension direction of the bottom plate 51. Through this design, the operator can more conveniently connect the first docking member 2 to the second docking member 3; if there are multiple bottom plates 51, the bottom plates 51 can be moved separately, which is not easy to cause conflict and avoid mutual influence between multiple rows.

[0082] More cleverly, a limit rib 52 is provided on the base 5, and the limit rib 52 is provided at the opening of the sliding groove 50, that is, away from the bottom wall thereof. This will not affect the normal sliding of the bottom plate 51, but can also prevent the bottom plate 51 from escaping from the sliding groove 50, further enhancing the reliability and safety of the test tooling in the present application.

[0083] In one embodiment, Figure 6 As shown, the test mechanism includes a charging device 6 and a pressure gauge 7. The pressure gauge 7 is used to read the pressure value in the sealed space. It can be understood that the test medium is injected into the micromotor 1 through the charging device 6, and the pressure gauge 7 reads the pressure value in the sealed space. The pressure change of the test medium can be monitored in real time to evaluate the sealing performance of the micromotor 1.

[0084] The charging device 6 is connected to the perfusion pipeline 8 leading out from the tail end of the micromotor 1, so that the test medium is injected into the micromotor 1 through the perfusion pipeline 8. The test medium fills the sealed space during the test. When it is detected that the pressure in the sealed space reaches a preset value, the charging device 6 suspends the input of the test medium. At the same time, the pressure in the sealed space needs to be maintained for a preset time to prove that the sealing performance of the micromotor 1 meets the requirements. Otherwise, there may be poorly sealed parts inside the micromotor 1, and the sealing performance does not meet the requirements.

[0085] The preset values ​​and preset times in the above content need to be set accordingly according to the specific situation or the model parameters of the micromotor 1. For example, "when the pressure value reaches 3atm, the charging device 6 stops inflating and maintains the pressure for 15 minutes" is set as the standard for meeting the sealing performance requirements. If the standard is not met, it means that the requirements are not met.

[0086] In one embodiment, the testing mechanism further includes a branch joint 9 having at least one main interface and at least two branch interfaces. The main interface is used to connect the pipeline leading out from the charging device 6 , and the branch interface is used to connect the perfusion pipeline 8 .

[0087] Among the branch interfaces, at least one branch interface has a diameter that is different from the diameters of the other branch interfaces, and is used to adapt to perfusion pipelines 8 of different diameters. It can be understood that the branch joint 9 serves as a connecting part 22, allowing the charging device 6 in the present application to be connected to perfusion pipelines 8 of different diameters, thereby increasing the applicability of the test tooling.

[0088] Specifically, Figure 6 As shown, the accompanying drawings show a branch connector 9, which is Y-shaped, that is, one branch connector 9 has two branch interfaces. Generally speaking, the use of this connector can meet most of the requirements in the test. Of course, the shape of the connector may also vary in other embodiments. Such modifications and changes are not shown in the accompanying drawings, but still exist.

[0089] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application, and these improvements and modifications should also be regarded as the protection scope of the present application.

Claims

1. A micromotor sealing test tool, characterized in that: include: A sealing mechanism, the sealing mechanism comprising a first docking member, a second docking member and a sealing member, The second docking member has an open cavity, the sealing member is located in the cavity, and one end of the first docking member is suitable for extending into the cavity to squeeze the sealing member; The first docking member has a through hole running through the axial direction thereof. During the test, the front end of the micromotor passes through the through hole and enters the chamber. The first docking member and / or the second docking member squeeze the sealing member so that the sealing member fills the gap between the micromotor and the chamber to form a sealed space at the front end of the micromotor. The testing mechanism is used for injecting a testing medium into the micromotor.

2. The micromotor sealing test tool according to claim 1, characterized in that: The first docking member includes an operating portion and a connecting portion, the operating portion and the connecting portion are connected to each other, and the through hole penetrates the operating portion and the connecting portion at the same time; The connecting portion and the chamber are matched to each other so that the connecting portion can extend into the chamber and move along the extending direction of the chamber.

3. The micromotor sealing test tool according to claim 2, characterized in that: The peripheral wall of the connecting portion is provided with an external thread, and the peripheral wall of the chamber is provided with an internal thread to form a threaded movable connection between the first docking member and the second docking member, so that the first docking member can adjust its relative position with the sealing member by a screwing operation.

4. The micromotor sealing test tool according to any one of claims 1 to 3, characterized in that: The depth of the chamber is at least equal to the height of the sealing member, and the sealing member is connected to or detachably from the chamber; The sealing member has a tubular profile, and the inner diameter of the sealing member is slightly smaller than the outer diameter of the micromotor, so that during the test process, the sealing member can be nested in the outer periphery of the micromotor.

5. The micromotor sealing test tool according to claim 1, characterized in that: A micromotor limiting portion is provided at the bottom of the chamber, and the inner contour of the micromotor limiting portion is matched with the outer contour of the micromotor front end structure for accommodating and positioning the micromotor front end structure.

6. The micromotor sealing test tool according to any one of claims 1 to 3 and 5, characterized in that: Also includes: The base is provided with at least one mounting position, and the second docking member can be fixedly or detachably connected to the mounting position.

7. The micromotor sealing test tool according to claim 6, characterized in that: The base also includes at least one bottom plate that is slidably arranged, and a sliding groove that is adapted to the bottom plate, and the bottom plate can be operated to slide in the corresponding sliding groove; A plurality of the mounting positions are arranged on one bottom plate, and the mounting positions are evenly distributed along the extension direction of the bottom plate.

8. The micromotor sealing test tool according to claim 7, characterized in that: The base is provided with a limit rib, which is located at the opening end of the sliding slot and partially exceeds the side wall of the sliding slot, so as to prevent the bottom plate from falling out of the sliding slot.

9. The micromotor sealing test tool according to any one of claims 1-3, 5, 7, and 8, characterized in that: The testing mechanism includes a pressure charging device and a pressure gauge; The charging device is connected to a perfusion pipeline leading out of the tail end of the micromotor, so that the test medium is injected into the micromotor through the perfusion pipeline, and the test medium fills the sealed space during the test process; The pressure gauge is used to read the pressure value in the sealed space.

10. The micromotor sealing test tool according to claim 9, characterized in that: The testing mechanism further comprises a branch joint, wherein the branch joint has at least one main interface and at least two branch interfaces, wherein the main interface is used to connect the pipeline led out from the charging device, and the branch interface is used to connect the perfusion pipeline; Among the branch interfaces, at least one branch interface has a diameter different from that of the other branch interfaces, so as to be adapted to the perfusion pipelines with different diameters.

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