Testing device, testing method and rotary-vane vacuum pump

Abstract

The invention discloses a testing device, a testing method and a rotary-vane vacuum pump, the testing device comprises a mounting cover plate, the mounting cover plate is fixed at the rear end of the vacuum pump, one side, deviating from the vacuum pump, of the mounting cover plate is provided with an annular groove, and the annular groove is internally provided with a plurality of first through holes communicated with the interior of the vacuum pump; the sealing gasket is assembled in the circular ring groove in a sealing mode, and second through holes corresponding to the first through holes in a one-to-one mode are formed in the sealing gasket; the annular sliding plate is rotationally assembled in the annular groove and located on the side, away from the mounting cover plate, of the sealing gasket, and a plurality of threaded holes are formed in the annular sliding plate and can correspondingly communicate with the different second through holes; the sensor comprises one or more of a pressure sensor, a temperature sensor and a photoelectric sensor, and the sensor is installed in the threaded hole to detect internal parameters of the vacuum pump. The pressure and temperature change conditions of the vacuum pump element can be accurately detected in real time, the requirements of different measurement positions can be met, and the universality and applicability of the testing device are improved.

Description

Technical Field

[0001] The present application relates to the field of vacuum pump testing technology, and in particular to a testing device, a testing method and a rotary vane vacuum pump. Background Art

[0002] As the core power unit of a gas station's secondary oil and vapor recovery system, the vapor recovery pump's performance parameters, such as ultimate vacuum, pumping rate, volumetric efficiency, and energy consumption, directly determine the system's overall oil and vapor recovery efficiency and environmental compliance. Therefore, developing a high-performance, highly reliable vapor recovery pump is crucial for improving oil and vapor recovery rates, reducing oil evaporation losses, and meeting increasingly stringent emissions regulations.

[0003] Currently, the oil and gas recovery pumps widely used in gas stations are primarily rotary vane vacuum pumps, whose operating principle is based on the radial motion of the vanes within the eccentric rotor slots and the periodically variable working chamber formed by the inner wall of the stator cavity, known as the cell volume. During the operation of a vacuum pump, cell pressure and temperature are two key parameters that are directly related to important performance indicators such as the pump's exhaust efficiency, ultimate vacuum, and service life. However, current testing of rotary vane vacuum pumps primarily focuses on ultimate vacuum, exhaust efficiency, and noise. Testing methods for the cell pressure and temperature of rotary vane vacuum pumps are relatively limited. Without a device for testing the internal cell pressure of a rotary vane vacuum pump, it is difficult to accurately and in real time obtain these parameters, which greatly limits in-depth research and optimization improvements to vacuum pump performance. Summary of the Invention

[0004] The purpose of this application is to provide a testing device, a testing method and a rotary vane vacuum pump, which can accurately detect the pressure and temperature changes of the vacuum pump element in real time, meet the needs of different measurement positions, and improve the versatility and applicability of the testing device.

[0005] To achieve the above objectives, the present application provides a testing device, comprising:

[0006] A mounting cover plate is fixed to the rear end of the vacuum pump, and a circular groove is provided on a side of the mounting cover plate facing away from the vacuum pump, wherein a plurality of first through holes communicating with the interior of the vacuum pump are provided in the circular groove;

[0007] a sealing gasket, sealingly assembled in the annular groove, the sealing gasket being provided with second through holes corresponding one-to-one to the plurality of first through holes;

[0008] an annular slide, rotatably assembled in the annular groove and located on a side of the sealing gasket away from the mounting cover plate, the annular slide being provided with a plurality of threaded holes, the threaded holes being capable of correspondingly communicating with different second through holes;

[0009] The sensor includes one or more of a pressure sensor, a temperature sensor and a photoelectric sensor, and the sensor is installed in the threaded hole to detect internal parameters of the vacuum pump.

[0010] In some embodiments, the plurality of first through holes are evenly distributed on a circle with the rotation center of the blade of the vacuum pump as the center, and each of the first through holes is tangent to the inner wall of the pump chamber of the vacuum pump.

[0011] In some embodiments, a fastening boss protruding from the surface of the mounting cover plate is provided on the side of the mounting cover plate facing away from the vacuum pump. The fastening boss takes the rotation center of the blade of the vacuum pump as its axis, and the annular groove is opened on the surface of the mounting cover plate at the outer periphery of the fastening boss.

[0012] In some embodiments, a fastening sleeve is further included, which is arranged on the outer periphery of the fastening boss, the fastening sleeve is threadedly connected to the fastening boss, and the side of the fastening sleeve facing the mounting cover plate abuts against the annular slide.

[0013] In some embodiments, the fastening boss is provided with a through hole communicating with the interior of the vacuum pump, so as to enable the blades of the vacuum pump to dock with an external drive shaft.

[0014] In some embodiments, the number of the threaded holes is three, and the pressure sensor, the temperature sensor, and the photoelectric sensor are respectively disposed in the three threaded holes;

[0015] The first through hole, the second through hole and the threaded hole have the same diameter and correspond to each other coaxially. When one of the threaded holes corresponds to the second through hole, the other two threaded holes correspond to different second through holes respectively.

[0016] In some embodiments, the detection end of the sensor enters the pump cavity of the vacuum pump through the threaded hole, the second through hole and the first through hole in sequence.

[0017] A rotary vane vacuum pump comprises a vacuum pump, a motor and the testing device as described above, wherein the output shaft of the motor is connected to a coupling, the coupling passes through the testing device and is connected to the vanes of the vacuum pump.

[0018] A testing method, applied to the rotary vane vacuum pump as described above, comprising:

[0019] Install the test device on the rear end of the vacuum pump and rotate the sensor to the target position;

[0020] The starting motor drives the vacuum pump to operate, and the sensor determines the position of the internal element of the vacuum pump through the pulse signal and the installation parameters of the blades in the pump, and measures the pressure and temperature data of the internal element of the pump in real time, and transmits the measured data to the data acquisition system;

[0021] The collected pressure, temperature and position data are analyzed and processed, and curves of pressure and temperature changes with time and position are drawn to calculate the elementary pressure and temperature distribution of the vacuum pump under different working conditions.

[0022] In some embodiments, the step of installing the testing device at the rear end of the vacuum pump and rotating the sensor to the target position includes:

[0023] Installing the mounting cover plate at the rear end of the vacuum pump;

[0024] Installing the sealing gasket in the annular groove of the mounting cover plate, and then installing the annular slide plate in the annular groove;

[0025] Installing the sensor in the threaded hole of the annular slide;

[0026] Loosen the fastening sleeve, adjust the position of the annular slide, and rotate the sensor to the target position; after the adjustment is completed, tighten the fastening sleeve.

[0027] The beneficial effect of the present application is that the test device of the present application is stably set at the rear end of the vacuum pump by installing the cover plate, ensuring the stability and reliability of the test. The annular groove provides a stable installation position for the sealing gasket and the annular slide. The sealing gasket can ensure the sealing during the test process, effectively preventing gas from leaking through the first through hole on the installation cover plate and through the gap between the installation cover plate and the annular slide plate, thereby ensuring the accuracy of the data during the measurement process; the rotating annular slide plate can adjust the detection position of the sensor to adapt to different measurement position requirements. As a result, the test device of the present application can accurately detect the changes in the pressure and temperature of the vacuum pump unit in real time and meet the requirements of different measurement positions, thereby improving the versatility and applicability of the test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0029] Figure 1 A schematic diagram of the structure of a rotary vane vacuum pump provided in an embodiment of the present application;

[0030] Figure 2 A schematic diagram of the structure of the test device provided in an embodiment of the present application;

[0031] Figure 3 A cross-sectional view of a test device provided in an embodiment of the present application;

[0032] Figure 4 A schematic diagram of the sealing gasket structure provided in an embodiment of the present application;

[0033] Figure 5 A schematic diagram of the structure of the fastening sleeve provided in an embodiment of the present application;

[0034] Figure 6 This is a schematic diagram of the ring skateboard structure provided in an embodiment of the present application.

[0035] In the figure: 1-vacuum pump; 2-coupling; 3-motor; 4-testing device;

[0036] 41-mounting cover; 42-pressure sensor; 43-temperature sensor; 44-photoelectric sensor; 45-ring slide; 46-fastening sleeve; 47-fastening boss; 48-sealing gasket;

[0037] 411 - annular groove; 451 - threaded hole; 471 - through hole; 481 - second through hole. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0039] It should be noted that in this embodiment, the directions or positional relationships indicated by "upper," "lower," "front," and "back" are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on this application. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0041] like Figure 1 and Figure 2As shown, in this embodiment, a testing device 4 is provided, which is installed at the rear end of the pump body of the vacuum pump 1. Specifically, the testing device 4 includes a mounting cover 41 fixed to the rear end of the vacuum pump 1. The mounting cover 41 can be fixedly connected to the pump body of the vacuum pump 1 by a bolt-fastening assembly method to form an integrated structure with the pump body, thereby ensuring the stability and reliability of the coordinated operation with the vacuum pump 1 during the test process.

[0042] A circular groove 411 is provided on the side of the mounting cover 41 facing away from the vacuum pump 1, and a plurality of first through holes are provided in the circular groove 411 which are connected to the interior of the pump body of the vacuum pump 1; a sealing gasket 48 and a circular slide 45 are assembled in the circular groove 411, and the annular contours of the sealing gasket 48 and the circular slide 45 are adapted to the annular contour of the circular groove 411, thereby providing a precise installation and positioning position for the sealing gasket 48 and the circular slide 45; the axial end face of the sealing gasket 48 is sealed in contact with the bottom of the circular groove 411, ensuring that the sealing gasket 48 can fit tightly in the circular groove 411, thereby effectively blocking gas leakage under the action of the sealing gasket 48 and maintaining the sealing during the test.

[0043] The circular slide plate 45 can be rotatably arranged and is located on the side of the sealing gasket 48 away from the mounting cover plate 41. Figure 3 The annular slide plate 45 may have a certain pressing force, thereby pressing the sealing gasket 48 tightly into the annular groove 411 to ensure the sealing performance of the sealing gasket 48 and the annular slide plate 45; a plurality of second through holes 481 corresponding to the first through holes are provided on the sealing gasket 48, please refer to Figure 4 , a plurality of threaded holes 451 are provided on the annular slide 45, please refer to Figure 6 By rotating the annular slide plate 45 , the threaded hole 451 can be connected to different second through holes 481 accordingly.

[0044] The test device 4 also includes a sensor, please refer to Figure 2 The sensor includes one or more of a pressure sensor 42, a temperature sensor 43 and a photoelectric sensor 44. The sensor is installed in the threaded hole 451, so that on the basis of the first through hole and the second through hole 481, the sensor can detect the internal parameters of the vacuum pump 1, and by rotating the annular slide 45, the position of the sensor can be adjusted to adapt to different measurement position requirements.

[0045] On the basis that the annular slide plate 45 is stably arranged in the annular groove 411 , various sensors carried and fixed thereon also have the advantages of high adjustment accuracy and precise positioning.

[0046] In summary of the above embodiments, the test device 4 of the present application is stably set at the rear end of the vacuum pump 1 by installing the cover plate 41 to ensure the stability and reliability of the test. The annular groove 411 provides a stable setting position for the sealing gasket 48 and the annular slide 45. The sealing gasket 48 can ensure the sealing during the test, effectively preventing the gas from leaking through the first through hole on the installation cover plate 41 and through the gap between the installation cover plate 41 and the annular slide 45, thereby ensuring the accuracy of the data during the measurement process; the rotating annular slide 45 can adjust the detection position of the sensor to adapt to different measurement position requirements. Therefore, the test device 4 of the present application can accurately detect the changes in the basic pressure and temperature of the vacuum pump 1 in real time and meet the needs of different measurement positions, thereby improving the versatility and applicability of the test device 4.

[0047] Among them, multiple first through holes are evenly distributed in a circle with the blade rotation center of the vacuum pump 1 as the center. For example, a number of first through holes are set to 50 through holes with a diameter of 3 mm. The through holes are evenly distributed in a circle with the blade rotation center as the center, and are precisely tangent to the inner wall of the pump chamber, establishing a channel for the precise installation and efficient measurement of various sensors, so that the sensors can be accurately connected to the predetermined position inside the pump chamber, and realize the accurate collection of key parameters such as elementary pressure and temperature.

[0048] In addition, a fastening boss 47 is provided on the side of the mounting cover 41 facing away from the vacuum pump 1 and protruding from the mounting cover 41. Figure 3 The fastening boss 47 is centered around the rotational center of the vacuum pump 1's blades, and an annular groove 411 is defined on the mounting cover 41's outer periphery. A through-hole 471 is provided on the fastening boss 47, communicating with the interior of the vacuum pump 1. This through-hole 471 allows the vacuum pump 1's blades to precisely mate with an external drive shaft or other key components, ensuring the coaxiality and stability of the entire testing device 4 during operation.

[0049] The test device 4 also includes a fastening sleeve 46, please refer to Figure 2 and Figure 5 The fastening sleeve 46 is sleeved on the outer periphery of the fastening boss 47, and the outer peripheral surface of the fastening boss 47 is processed with a fine thread structure, and the corresponding inner peripheral surface of the fastening sleeve 46 is also processed with a thread structure that matches it. This thread design provides a precise thread matching surface for the installation of the fastening sleeve 46, so that the fastening sleeve 46 can be firmly screwed on the boss; the side of the fastening sleeve 46 facing the installation cover 41 abuts against the annular slide 45, and the clamping force generated by tightening the fastening sleeve 46 tightly fixes the annular slide 45 and the sensor installed thereon to the cover, ensuring the stability of the sensor during the test process. At the same time, with the synergistic effect of the sealing gasket 48, the effective sealing of the position where the sensor is not installed on the installation cover 41 is achieved, thereby ensuring the sealing performance and measurement accuracy of the test device 4.

[0050] Furthermore, the number of threaded holes 451 is three, please refer to Figure 6 A pressure sensor 42, a temperature sensor 43, and a photoelectric sensor 44 are respectively provided in the three threaded holes 451. The pressure sensor 42 is used to measure the pressure of the internal element of the vacuum pump 1. The high-precision pressure sensor 42 can accurately and in real time obtain pressure changes at different locations within the pump, providing key data for analyzing the pumping efficiency and pressure distribution of the vacuum pump 1. The temperature sensor 43 is used to measure the temperature of the internal element of the vacuum pump 1. The temperature sensor 43 can accurately sense temperature changes within the pump, which is of great significance for evaluating the thermal stability of the vacuum pump 1 during operation and preventing malfunctions caused by excessive temperature. The photoelectric sensor 44 is used to determine the position of the internal element of the vacuum pump 1. When the blade rotates to the position of the photoelectric sensor 44, the photoelectric sensor 44 can generate a pulse signal. By combining the pulse signal with the installation parameters of the blades within the pump, the position of the internal element of the pump can be accurately determined, providing a precise spatial reference for pressure and temperature measurements.

[0051] In order to ensure the detection accuracy of various sensors, the diameters of the first through hole, the second through hole 481 and the threaded hole 451 can be kept the same to ensure that the sensor can be accurately aligned in the pump chamber of the vacuum pump 1, and the sensor detection end passes through the threaded hole 451, the second through hole 481 and the first through hole in turn to enter the predetermined position inside the pump chamber of the vacuum pump 1; and when one of the threaded holes 451 corresponds to the second through hole 481, that is, when one sensor corresponds to the second through hole 481 to detect the internal data of the vacuum pump 1, the other two threaded holes 451 can also correspond to different second through holes 481 respectively, so that the other two sensors can also detect other data inside the vacuum pump 1, so that multiple sensors can perform detection work at the same time, thereby improving detection efficiency.

[0052] In other words, when 50 first through holes with a diameter of 3 mm are distributed on the mounting cover 41, 50 second through holes 481 with a diameter of 3 mm are also distributed on the sealing gasket 48. The hole distribution corresponds one-to-one with the through holes on the mounting cover 41. The two are highly matched in size and layout, ensuring precise docking during assembly.

[0053] This application also provides a rotary vane vacuum pump, please refer to Figure 1 The rotary vane vacuum pump includes a vacuum pump 1, a motor 3 and the test device 4 as mentioned above. The vacuum pump 1 is used as the test object, and its internal structure and working principle are the core application objects of the test device 4 and the test method of this application. During the test process, it is necessary to ensure that the vacuum pump 1 is in a normal working state.

[0054] The output shaft of the motor 3 is connected to the coupling 2. The motor 3 serves as a driving source to provide power for the operation of the vacuum pump 1, ensuring that it can rotate stably at a predetermined speed, thereby achieving the normal operation of the vacuum pump 1; the coupling 2 passes through the test device 4 and is connected to the blades of the vacuum pump 1, efficiently and stably transmitting the rotational power of the motor 3 to the vacuum pump 1, ensuring smooth and reliable power transmission between the two, and avoiding affecting the performance of the vacuum pump 1 due to poor power transmission.

[0055] The present application also provides a testing method that can be applied to the rotary vane vacuum pump as described above, the method comprising:

[0056] Install the test device 4 at the rear end of the vacuum pump 1 and rotate the sensors to the target position. Specifically, first bolt the mounting cover 41 to the rear end of the vacuum pump 1, ensuring a secure fit and a good seal. Then, install the sealing gasket 48 into the annular groove 411 of the mounting cover 41, and then install the annular slide 45 into the annular groove 411 of the mounting cover 41. Thread the pressure sensor 42, temperature sensor 43, and photoelectric sensor 44 into the threaded hole 451 of the annular slide 45. Preliminary adjust the sensor positions based on the position of the element to be measured.

[0057] Then, loosen the tightening sleeve 46, adjust the position of the annular slide 45, and rotate the pressure sensor 42 and temperature sensor 43 to the target position, ensuring that the sensors correspond to the position of the element in the pump chamber. After the adjustment is completed, tighten the tightening sleeve 46. The compression force and sealing gasket 48 seal the position of the mounting cover 41 where the sensor is not installed, ensuring that gas leakage during the measurement process will not affect the accuracy of the measurement results.

[0058] Starting motor 3 drives vacuum pump 1. During operation, pressure sensor 42 and temperature sensor 43 measure the pressure and temperature of the pump's internal elements in real time and transmit the measured data to the data acquisition system. Simultaneously, when the blades rotate to the position of photoelectric sensor 44, it generates a pulse signal. This pulse signal, combined with the pump's blade installation parameters, determines the position of the internal elements, providing precise spatial positioning for pressure and temperature data.

[0059] The collected pressure, temperature and position data are analyzed and processed, and curves of pressure and temperature changes with time and position are drawn. The elementary pressure and temperature distribution of the vacuum pump 1 under different working conditions are calculated, thereby evaluating the performance of the vacuum pump 1 and providing a scientific basis for optimizing the design and operating parameters of the vacuum pump 1.

[0060] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0061] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the method and core ideas of this application. It should be noted that for those skilled in the art, without departing from the principles of this application, various improvements and modifications can be made to this application, and such improvements and modifications also fall within the scope of protection of the claims of this application.

Claims

1. A testing device, characterized in that: include: A mounting cover plate (41), the mounting cover plate (41) being fixed to the rear end of the vacuum pump (1), a circular groove (411) being provided on a side of the mounting cover plate (41) facing away from the vacuum pump (1), and a plurality of first through holes being provided in the circular groove (411) and communicating with the interior of the vacuum pump (1); a sealing gasket (48) sealingly assembled in the annular groove (411), the sealing gasket (48) being provided with second through holes (481) corresponding one-to-one to the plurality of first through holes; a circular slide plate (45) rotatably assembled in the circular groove (411) and located on a side of the sealing gasket (48) facing away from the mounting cover plate (41); a plurality of threaded holes (451) are provided on the circular slide plate (45); the threaded holes (451) can be correspondingly connected to different second through holes (481); The sensor comprises one or more of a pressure sensor (42), a temperature sensor (43) and a photoelectric sensor (44), wherein the sensor is installed in the threaded hole (451) to detect internal parameters of the vacuum pump (1).

2. The testing device according to claim 1, wherein: The plurality of first through holes are evenly distributed on a circle with the rotation center of the blade of the vacuum pump (1) as the center, and each of the first through holes is tangent to the inner wall of the pump chamber of the vacuum pump (1).

3. The testing device according to claim 1, wherein: A fastening boss (47) protruding from the surface of the mounting cover plate (41) is provided on the side of the mounting cover plate (41) facing away from the vacuum pump (1). The fastening boss (47) takes the rotation center of the blade of the vacuum pump (1) as its axis, and the annular groove (411) is opened on the surface of the mounting cover plate (41) at the outer periphery of the fastening boss (47).

4. The testing device according to claim 3, characterized in that: It also includes a fastening sleeve (46), which is sleeved on the outer periphery of the fastening boss (47), the fastening sleeve (46) is threadedly connected to the fastening boss (47), and the side of the fastening sleeve (46) facing the installation cover (41) abuts against the annular slide plate (45).

5. The testing device according to claim 3, characterized in that: The fastening boss (47) is provided with a through hole (471) communicating with the interior of the vacuum pump (1) and used for docking the blades of the vacuum pump (1) with an external drive shaft.

6. The testing device according to claim 1, characterized in that The number of the threaded holes (451) is three, and the pressure sensor (42), the temperature sensor (43), and the photoelectric sensor (44) are respectively arranged in the three threaded holes (451); The first through hole, the second through hole (481), and the threaded hole (451) have the same diameter and are coaxially corresponding. When one of the threaded holes (451) corresponds to the second through hole (481), the other two threaded holes (451) respectively correspond to different second through holes (481).

7. The testing device according to claim 1, characterized in that The detection end of the sensor passes through the threaded hole (451), the second through hole (481), and the first through hole in sequence and enters the pump cavity of the vacuum pump (1).

8. A rotary vane vacuum pump, characterized in that: The invention comprises a vacuum pump (1), a motor (3) and a test device (4) according to any one of claims 1 to 7, wherein the output shaft of the motor (3) is connected to a coupling (2), and the coupling (2) passes through the test device (4) and is connected to the blades of the vacuum pump (1).

9. A testing method, characterized in that: The rotary vane vacuum pump according to claim 8 comprises: Install the test device (4) at the rear end of the vacuum pump (1) and rotate the sensor to the target position; The starting motor (3) drives the vacuum pump (1) to operate, and the sensor determines the position of the internal element of the vacuum pump (1) through the pulse signal and the installation parameters of the blades in the pump, and measures the pressure and temperature data of the internal element in the pump in real time, and transmits the measured data to the data acquisition system; The collected pressure, temperature and position data are analyzed and processed, and curves showing changes of pressure and temperature over time and position are drawn to calculate the distribution of the elemental pressure and temperature of the vacuum pump (1) under different working conditions.

10. The testing method according to claim 9, characterized in that: The steps of installing the testing device (4) at the rear end of the vacuum pump (1) and rotating the sensor to the target position include: The mounting cover plate (41) is mounted on the rear end of the vacuum pump (1); Installing the sealing gasket (48) in the annular groove (411) of the installation cover plate (41), and then installing the annular slide plate (45) in the annular groove (411); Installing the sensor in the threaded hole (451) of the annular slide (45); Loosen the fastening sleeve (46), adjust the position of the annular slide (45), and rotate the sensor to the target position; after the adjustment is completed, tighten the fastening sleeve (46).

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