Multi-stage booster pump and pressure calibrator

Abstract

The invention provides a multi-stage booster pump and a pressure check meter. The multi-stage booster pump comprises a pump body, a driving mechanism, a rotating shaft, at least two cams, at least two booster parts, at least two linkage structures and a multi-stage cylinder body, the rotating shaft is rotatably arranged on the pump body; the driving mechanism is used for driving the rotating shaft to rotate; the at least two cams are arranged on the rotating shaft at intervals, each cam vertically protrudes along the axis of the rotating shaft, and the protruding directions of the at least two cams are different; each linkage structure is in linkage with the corresponding cam and the corresponding pressurizing piece, and the rotating motion of each cam around the axis of the rotating shaft is converted into linear motion of the corresponding pressurizing piece along the corresponding cylinder body. The multiple stages of cylinder bodies are sequentially communicated according to the stage sequence number, and a one-way valve is arranged between every two adjacent stages of cylinder bodies. Miniaturization design of the booster pump is achieved, high pressure can be rapidly output through a small-power motor, and the boosting efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of booster technology, and in particular to a multi-stage booster pump and pressure calibrator. Background Technology

[0002] In the process of calibrating gas / liquid pressure gauges using portable pressure calibration instruments, compressed air / liquid with a certain pressure is required as the medium for calibration. Traditionally, compressed air / liquid is mainly supplied in two ways: using a portable manual pump or carrying a high-pressure gas cylinder / liquid tank. Manual pumps are primarily used in manual pressure gauge calibration devices. To complete the calibration process, operators need to continuously operate the manual pump to ensure sufficient compressed air / liquid is generated, resulting in high labor intensity and reduced efficiency. With increasing industrial automation, automatic pressure gauge calibration devices have emerged, using high-pressure gas cylinders / liquid tanks to provide compressed air / liquid. However, these high-pressure cylinders / tanks have limited capacity, are bulky, and difficult to transport, causing inconvenience for on-site pressure gauge calibration and failing to meet the needs of automatic pressure gauge calibration in industrial settings. Subsequently, using electric pumps to generate pressure has become a trend. However, existing electric pumps are designed for high industrial flow rates and suffer from drawbacks such as large size, weight, and high power consumption, severely restricting the development of portable or handheld automatic pressure gauge calibration devices towards automation, miniaturization, and high integration. To achieve miniaturization of electric pumps, some technicians often reduce the size of the motor and pump body proportionally. However, these electric pumps mostly use a single-cylinder booster method, and reducing the pump body will lead to a significant decrease in booster efficiency, affecting calibration efficiency. If the pump body is increased in size, it contradicts the miniaturization requirement, and it is also difficult to achieve the predetermined high pressure when a small-power motor is matched with a large pump body.

[0003] Therefore, it is necessary to design a miniature electric air pump that can increase pressure to meet the needs of automated, miniaturized, and automatic calibration devices for pressure instruments. Summary of the Invention

[0004] To address at least one of the aforementioned technical problems, this invention proposes a multi-stage booster pump and pressure testing instrument that can rapidly output high pressure using a low-power motor, thereby meeting the needs of automated, miniaturized, and integrated automatic calibration devices for pressure instruments.

[0005] This invention proposes a multi-stage booster pump, comprising: a pump body, a drive mechanism, a rotating shaft, at least two cams, at least two booster components, at least two linkage structures, and a multi-stage cylinder; The rotating shaft is rotatably mounted on the pump body; The drive mechanism is used to drive the rotating shaft to rotate; At least two cams are spaced apart on the rotating shaft, and each cam protrudes vertically along the axis of the rotating shaft, and the protrusion directions of at least two cams are different; At least two cams, at least two booster components, and at least two linkage structures correspond one-to-one. Each linkage structure is linked to the corresponding cam and the corresponding booster component, and converts the rotational motion of each cam around the axis of rotation into the linear motion of the corresponding booster component along the corresponding cylinder. The multi-stage cylinders are connected sequentially according to their level numbers, and a one-way valve is provided between adjacent cylinders. In adjacent cylinders, the inner diameter of the lower-level cylinder is greater than or equal to the inner diameter of the higher-level cylinder.

[0006] Furthermore, each booster component includes a booster rod and pistons or plungers located at both ends of the booster rod, and the pistons or plungers at both ends of the booster rod can be sealed and moved in the corresponding cylinder.

[0007] Furthermore, the linkage structure is an elliptical track formed on the corresponding booster rod, with the major axis of the elliptical track being larger than the diameter of the corresponding cam, and the minor axis of the elliptical track matching the diameter of the cam. The cam is fitted in the elliptical track, and the rotating shaft rotates to drive the cam to slide along the elliptical track, pushing the booster rod to make linear motion.

[0008] Furthermore, the multi-stage booster pump also includes at least two bearings, each of which is mounted on a corresponding cam.

[0009] Furthermore, the projection lines of the convex directions of at least two cams onto the cross-section of the rotating shaft evenly divide the cross-section of the rotating shaft.

[0010] Furthermore, at least two cams include a first cam and a second cam, which are fixedly mounted on the rotating shaft at a distance from each other; At least two superchargers, including a first supercharger and a second supercharger; At least two linkage structures include a first linkage structure and a second linkage structure; The first linkage structure is an elliptical track on the first booster component, and the second linkage structure is an elliptical track on the second booster component. The first cam is sleeved in the first linkage structure, and the second cam is sleeved in the second linkage structure.

[0011] Furthermore, the multi-stage cylinder block includes a first-stage cylinder block, a second-stage cylinder block, a third-stage cylinder block, and a fourth-stage cylinder block. The first-stage cylinder block, the second-stage cylinder block, the third-stage cylinder block, and the fourth-stage cylinder block are connected sequentially according to their stage numbers. Each stage cylinder block has an inlet and an outlet at its end. The outlet of the previous stage cylinder block is connected to the inlet of the next stage cylinder block. An inlet check valve is provided at the inlet, and an outlet check valve is provided at the outlet.

[0012] Furthermore, the first booster includes a first booster rod and a first-stage piston and a second-stage piston located at both ends of the first booster rod. The first-stage piston is movably disposed in the first-stage cylinder, and the second-stage piston is movably disposed in the second-stage cylinder. The first booster includes a second booster rod and a third-stage piston and a fourth-stage piston located at both ends of the second booster rod. The third-stage piston is movably disposed in the third-stage cylinder, and the fourth-stage piston is movably disposed in the fourth-stage cylinder.

[0013] Furthermore, the inner diameters of the first-stage, second-stage, third-stage, and fourth-stage cylinder blocks decrease sequentially according to the stage number; or The first-stage cylinder block and the second-stage cylinder block have the same inner diameter, and the third-stage cylinder block and the fourth-stage cylinder block have the same inner diameter. Furthermore, the inner diameters of the first-stage cylinder block and the second-stage cylinder block are larger than the inner diameters of the third-stage cylinder block and the fourth-stage cylinder block.

[0014] The present invention also proposes a pressure calibrator, which includes a multi-stage booster pump as described above.

[0015] The multi-stage booster pump and pressure calibrator of this invention use a motor to drive a rotating shaft, which in turn drives multiple cams to rotate. Simultaneously, with the cooperation of a linkage structure, multiple booster components move alternately, enabling the multi-stage cylinder to perform step-by-step pressurization. This invention achieves a miniaturized booster pump design and can quickly output high pressure using a low-power motor, meeting the miniaturization and integration requirements of automatic pressure instrument calibration devices.

[0016] Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description or may be learned by practice of the invention. Attached Figure Description

[0017] Figure 1 A three-dimensional schematic diagram of a multi-stage booster pump according to the present invention is shown from one perspective; Figure 2 yes Figure 1 A three-dimensional schematic diagram of a multi-stage booster pump from another perspective; Figure 3 yes Figure 1 A cross-sectional schematic diagram of a multistage booster pump.

[0018] Figure label: Multistage booster pump 100; Pump body 10; Drive mechanism 20, motor 21, drive pulley 211, transmission belt 22; Rotating shaft 30, first cam 31, second cam 32, driven wheel 33; First pressurizing component 40, first linkage structure 41, first pressurizing rod 42, first stage piston 43, second stage piston 44; First booster component 50, second linkage structure 51, second booster rod 52, third stage piston 53, fourth stage piston 54; First stage cylinder 61, first inlet 611, first outlet 612, first inlet check valve 613, first outlet check valve 614, second stage cylinder 62, second inlet 621, second outlet 622, second inlet check valve 623, second outlet check valve 624, third stage cylinder 63, fourth stage cylinder 64; Bearing 70. Detailed Implementation

[0019] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0021] like Figures 1 to 3 As shown, the present invention proposes a multi-stage booster pump 100, comprising: a pump body 10, a drive mechanism 20, a rotating shaft 30, at least two cams 31 and 32, at least two booster components 40 and 50, at least two linkage structures 41 and 51, and multi-stage cylinders 61, 62, 63 and 64. The rotating shaft 30 is rotatably mounted on the pump body 10; The drive mechanism 20 is used to drive the rotating shaft 30 to rotate; At least two cams 31 and 32 are spaced apart on the rotating shaft 30, and each cam protrudes vertically along the axis of the rotating shaft, and the protrusion directions of at least two cams 31 and 32 are different; At least two cams 31 and 32, at least two booster components 40 and 50 correspond one-to-one with at least two linkage structures 41 and 51. Each linkage structure is linked to the corresponding cam and the corresponding booster component, and converts the rotational motion of each cam around the axis of rotation into the linear motion of the corresponding booster component along the corresponding cylinder. The multi-stage cylinders 61, 62, 63, and 64 are connected sequentially according to their stage numbers, and a one-way valve is provided between adjacent cylinders. In adjacent cylinders, the inner diameter of the lower-stage cylinder is greater than or equal to the inner diameter of the higher-stage cylinder.

[0022] It is understood that at least two cams must have the same shape and size, and at least two linkage structures must have the same shape and size. However, this is not the only requirement.

[0023] It is understandable that, since one-way valves are installed between adjacent cylinders, pressure can be ensured to be forced from the larger lower-stage cylinder into the smaller higher-stage cylinder without backflow, thus achieving the effect of step-by-step pressurization.

[0024] Furthermore, each booster component includes a booster rod and pistons or plungers located at both ends of the booster rod, and the pistons or plungers at both ends of the booster rod can be sealed and moved in the corresponding cylinder.

[0025] Furthermore, the linkage structures 41 and 51 are elliptical tracks formed on the corresponding booster rods, and the major axis of the elliptical track is larger than the diameter of the corresponding cam, while the minor axis of the elliptical track is adapted to the diameter of the cam. The cam is fitted in the elliptical track, and the rotating shaft rotates to drive the cam to slide along the elliptical track, thereby pushing the booster rod to make linear motion.

[0026] Furthermore, the multi-stage booster pump 100 also includes at least two bearings 70, each bearing 70 being fitted onto a corresponding cam.

[0027] It is understandable that by fitting a bearing 70 onto the cam, the relative sliding of the cam on the elliptical track can be converted into rolling between the bearings, thereby reducing the motion wear between the cam and the elliptical track and improving its service life.

[0028] Furthermore, the projection lines of the convex directions of at least two cams onto the cross-section of the rotating shaft evenly divide the cross-section of the rotating shaft.

[0029] In a specific embodiment, when there are two cams, the cam protrusions are parallel and opposite in direction, and their projection lines on the cross-section of the rotating shaft are the bisecting lines of the cross-section of the rotating shaft; when there are three cams, the projection lines of the cam protrusions onto the cross-section of the rotating shaft divide the cross-section of the rotating shaft into three equal parts. However, this is not the only possibility.

[0030] Furthermore, at least two cams 31 and 32 include a first cam 31 and a second cam 32, which are fixedly mounted on the rotating shaft 30 at a distance from each other. At least two superchargers 40 and 50 include a first supercharger 40 and a second supercharger 50; At least two linkage structures 41 and 51 include a first linkage structure 41 and a second linkage structure 51; The first linkage structure 41 is an elliptical track on the first booster 40, the second linkage structure 51 is an elliptical track on the second booster 50, the first cam 31 is sleeved in the first linkage structure 41, and the second cam 32 is sleeved in the second linkage structure 51.

[0031] Furthermore, the multi-stage cylinder blocks 61, 62, 63, and 64 include a first-stage cylinder block 61, a second-stage cylinder block 62, a third-stage cylinder block 63, and a fourth-stage cylinder block 64. The first-stage cylinder blocks 61, the second-stage cylinder blocks 62, the third-stage cylinder blocks 63, and the fourth-stage cylinder blocks 64 are connected sequentially according to their stage numbers. Each stage cylinder block has an inlet and an outlet at its end. The outlet of the previous stage cylinder block is connected to the inlet of the next stage cylinder block. An inlet check valve is provided at the inlet, and an outlet check valve is provided at the outlet.

[0032] In a specific embodiment, the first-stage cylinder 61 has a first inlet 611 and a first outlet 612 at its end; a first inlet check valve 613 is provided at the first inlet 611, and a first outlet check valve 614 is provided at the first outlet 612. When the internal volume of the first-stage cylinder 61 increases, the internal pressure of the first-stage cylinder 61 decreases, and external gas can enter the first-stage cylinder 61 through the first inlet check valve 613 to complete the intake action of the first-stage cylinder 61. Since the first outlet check valve 614 is in the opposite direction to the first inlet check valve 613, the first outlet check valve 614 is in the closed state at this time, that is, the gas in the second-stage cylinder 62 will not flow back to the first-stage cylinder 61. When the volume of the inner cavity of the first-stage cylinder 61 decreases, the pressure inside the first-stage cylinder 61 increases. The gas inside the first-stage cylinder 61 can then push open the first outlet check valve 614 and enter the second-stage cylinder 62, completing the pressurization action of the first-stage cylinder 61. Since the first inlet check valve 613 and the first outlet check valve 614 are in opposite directions, the first inlet check valve 613 is closed at this time, and the gas in the first-stage cylinder 61 will not be discharged to the outside through the first inlet 611.

[0033] The second-stage cylinder 62 has a second inlet 621 and a second outlet 622 at its end. A second inlet check valve 623 is installed at the second inlet 621, and a second outlet check valve 624 is installed at the second outlet 622. The second inlet 621 of the second-stage cylinder 62 is connected to the first outlet 612 of the first-stage cylinder 61 via an external pipeline (not shown). When the internal volume of the second-stage cylinder 62 expands, the internal pressure decreases, allowing gas from the first-stage cylinder 61 to enter the second-stage cylinder 62 through the second inlet check valve 623, completing the intake action of the second-stage cylinder 62. Since the second outlet check valve 624 is in the opposite direction to the second inlet check valve 623, it is closed at this time, meaning that gas from the third-stage cylinder 63 will not flow back to the second-stage cylinder 62. When the internal volume of the second-stage cylinder 62 decreases, the internal pressure of the second-stage cylinder 62 increases. The gas in the second-stage cylinder 62 can then push open the second outlet check valve 624 and enter the third-stage cylinder 63, completing the pressurization action of the second-stage cylinder 62. Since the second inlet check valve 623 and the second outlet check valve 624 are in opposite directions, the second inlet check valve 623 is closed at this time, and the gas in the second-stage cylinder 62 will not flow back to the first-stage cylinder 61 through the second inlet 621.

[0034] It is understood that the third-stage cylinder 63 includes a third inlet (not shown) and a third outlet (not shown). The second outlet 622 of the second-stage cylinder 62 is connected to the third inlet of the third-stage cylinder 63 via an external pipeline. The fourth-stage cylinder 64 includes a fourth inlet (not shown) and a fourth outlet (not shown). The fourth inlet of the fourth-stage cylinder 64 is connected to the third outlet of the third-stage cylinder 63 via an external pipeline, and the fourth outlet of the fourth-stage cylinder 64 is used to connect to an external output pipeline. The intake and pressurization processes of the third-stage cylinder 63 and the fourth-stage cylinder 64 are the same as those of the first-stage cylinder 61 and the second-stage cylinder 62 described above, and will not be repeated here.

[0035] Furthermore, the first booster 40 includes a first booster rod 42 and a first-stage piston 43 and a second-stage piston 44 located at both ends of the first booster rod 42. The first-stage piston 43 is movably disposed in the first-stage cylinder 61, and the second-stage piston 44 is movably disposed in the second-stage cylinder 62. The first booster 50 includes a second booster rod 52 and a third-stage piston 53 and a fourth-stage piston 54 located at both ends of the second booster rod 52. The third-stage piston 53 is movably disposed in the third-stage cylinder 63, and the fourth-stage piston 64 is movably disposed in the fourth-stage cylinder 64.

[0036] Furthermore, the inner diameters of the first-stage cylinder block 61, the second-stage cylinder block 62, the third-stage cylinder block 63, and the fourth-stage cylinder block 64 decrease sequentially according to the stage number; or The first-stage cylinder 61 and the second-stage cylinder 62 have the same inner diameter, and the third-stage cylinder 63 and the fourth-stage cylinder 64 have the same inner diameter. The inner diameters of the first-stage cylinder 61 and the second-stage cylinder 62 are larger than the inner diameters of the third-stage cylinder 63 and the fourth-stage cylinder 64.

[0037] Furthermore, the drive mechanism 20 also includes a motor 21 and a transmission belt 22. The motor 21 is provided with a drive wheel 211, one end of the rotating shaft 30 extends out of the pump body 10 and is connected to a driven wheel 33, and the transmission belt 22 is respectively sleeved between the drive wheel 211 and the driven wheel 33.

[0038] Preferably, the diameter of the driven wheel 33 is larger than the diameter of the driving wheel 211, but it is not limited thereto. It can be understood that by making the diameter of the driven wheel 33 larger than the diameter of the driving wheel 211, the present invention can increase the torque of the rotating shaft 30, and achieve the power output of a larger torque of the rotating shaft 30 with a smaller power motor 21, which is beneficial to increasing the maximum pressure value after multi-stage pressurization.

[0039] To further illustrate the multi-stage booster device of the present invention, its working principle is described in detail below.

[0040] Motor 21 drives drive wheel 211 to rotate, which in turn drives driven wheel 33 to rotate via transmission belt 22, thereby driving rotating shaft 30 to rotate. Rotation of rotating shaft 30 drives first cam 31 and second cam 32 to rotate around the axis of rotating shaft 30. While rotating along the axis of rotating shaft 30, first cam 31 also slides along the elliptical track inside first linkage structure 41, thereby driving first booster rod 42 of first booster member 40 to move linearly. This causes first-stage piston 43 and second-stage piston 44 at both ends of first booster rod 42 to slide in first-stage cylinder 61 and second-stage cylinder 62 respectively, causing the inner cavity volume of first-stage cylinder 61 and second-stage cylinder 62 to increase or decrease. Similarly, while the second cam 32 rotates along the axis of the rotating shaft 30, it also slides along the elliptical track within the second linkage structure 51, thereby driving the second booster 50 to move linearly. This causes the third-stage piston 53 and the fourth-stage piston 54 at both ends of the second booster rod 52 to slide in the third-stage cylinder 63 and the fourth-stage cylinder 64, respectively, resulting in an increase or decrease in the internal volume of the third-stage cylinder 63 and the fourth-stage cylinder 64. Specifically, under the constraints of the above structure, taking one revolution of the rotating shaft 30 as a cycle, when the internal volume of the first-stage cylinder 61 gradually increases, the internal volume of the second-stage cylinder 62 gradually decreases, the internal volume of the third-stage cylinder 63 gradually increases, and the internal volume of the fourth-stage cylinder 64 gradually decreases; similarly, when the internal volume of the first-stage cylinder 61 gradually decreases, the internal volume of the second-stage cylinder 62 gradually increases, the internal volume of the third-stage cylinder 63 gradually decreases, and the internal volume of the fourth-stage cylinder 64 gradually increases.

[0041] Specifically, when the internal volume of the first-stage cylinder 61 increases, the internal pressure of the first-stage cylinder 61 decreases, allowing external gas to enter the first-stage cylinder 61 through the first inlet check valve 613, completing the intake action of the first-stage cylinder 61. Since the first outlet check valve 614 is in the opposite direction to the first inlet check valve 613, it is closed at this time, meaning that the gas in the second-stage cylinder 62 will not flow back to the first-stage cylinder 61. At the same time, the internal volume of the second-stage cylinder 62 decreases, increasing the internal pressure. The gas in the second-stage cylinder 62 can then push open the second outlet check valve 624 to enter the third-stage cylinder 63, performing the pressurization action of the second-stage cylinder 62. Since the second inlet check valve 623 is in the opposite direction to the second outlet check valve 624, it is closed at this time, meaning that the gas in the second-stage cylinder 62 will not flow back to the first-stage cylinder 61 through the second inlet 621. Similarly, at this time, the inner volume of the third-stage cylinder 63 increases and receives the gas pressurized from the second-stage cylinder 62, while the inner volume of the fourth-stage cylinder 64 decreases to perform the fourth-stage pressurization action and deliver the pressurized gas to the output pipe.

[0042] When the internal volume of the first-stage cylinder 61 decreases, the internal pressure of the first-stage cylinder 61 increases. The gas inside the first-stage cylinder 61 can then push open the first outlet check valve 614 to enter the second-stage cylinder 62, completing the pressurization action of the first-stage cylinder 61. Since the first inlet check valve 613 and the first outlet check valve 614 are in opposite directions, the first inlet check valve 613 is closed at this time, and the gas in the first-stage cylinder 61 will not be discharged to the outside through the first inlet 611. Simultaneously, the internal volume of the second-stage cylinder 62 increases, and the internal pressure of the second-stage cylinder 62 decreases. The gas from the first-stage cylinder 61 can then enter the second-stage cylinder 62 through the second inlet check valve 623, completing the intake action of the second-stage cylinder 62. Since the second outlet check valve 624 is in opposite directions to the second inlet check valve 623, the second outlet check valve 624 is closed at this time, meaning that the gas from the third-stage cylinder 63 will not flow back to the second-stage cylinder 62. Similarly, at this time, the inner volume of the third-stage cylinder 63 decreases to perform the third-stage pressurization action, while the inner volume of the fourth-stage cylinder 64 increases to receive the gas pressurized from the third-stage cylinder 63.

[0043] It is understandable that, since the inner diameters of the first-stage cylinder 61, the second-stage cylinder 62, the third-stage cylinder 63, and the fourth-stage cylinder 64 decrease sequentially according to the stage number, the effect of step-by-step pressurization can be achieved when the rotating shaft 30 rotates.

[0044] It is understood that the multi-stage booster pump of the present invention can be used to boost gas or liquid to output high-pressure gas or high-pressure liquid.

[0045] The multi-stage booster pump of this invention uses a motor to drive a rotating shaft, which in turn drives multiple cams to rotate. Simultaneously, with the cooperation of a linkage structure, multiple boosting components move alternately, enabling the multi-stage cylinder to perform step-by-step pressurization. This invention achieves a miniaturized booster pump design and can quickly output high pressure using a low-power motor, meeting the miniaturization and integration requirements of automatic pressure gauge calibration devices.

[0046] The present invention also proposes a pressure calibrator, which includes the aforementioned multi-stage booster pump and rapidly pressurizes the pressure to output calibration pressure to the instrument under test.

[0047] It should be noted that the rotatable connection described in this invention can be achieved through the fit between a pivot and a pivot hole. For example, if one component is rotatably connected to another component, pivot holes can be provided at corresponding positions on both components, and then the rotatable connection can be achieved by passing a pivot through the pivot holes of the two components. However, this is not the only possibility.

[0048] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A multi-stage booster pump, characterized in that, include: Pump body, drive mechanism, rotating shaft, at least two cams, at least two booster components, at least two linkage structures, and multi-stage cylinder; The rotating shaft is rotatably mounted on the pump body; The drive mechanism is used to drive the rotating shaft to rotate; At least two cams are spaced apart on the rotating shaft, and each cam protrudes vertically along the axis of the rotating shaft, and the protrusion directions of at least two cams are different; At least two cams, at least two booster components, and at least two linkage structures correspond one-to-one. Each linkage structure is linked to the corresponding cam and the corresponding booster component, and converts the rotational motion of each cam around the axis of rotation into the linear motion of the corresponding booster component along the corresponding cylinder. The multi-stage cylinders are connected sequentially according to their level numbers, and a one-way valve is provided between adjacent cylinders. In adjacent cylinders, the inner diameter of the lower-level cylinder is greater than or equal to the inner diameter of the higher-level cylinder.

2. The multi-stage booster pump according to claim 1, characterized in that, Each booster includes a booster rod and pistons or plungers located at both ends of the booster rod. The pistons or plungers at both ends of the booster rod can be sealed and moved in the corresponding cylinder.

3. A multi-stage booster pump according to claim 2, characterized in that, The linkage structure is an elliptical track formed on the corresponding booster rod, with the major axis of the elliptical track being larger than the diameter of the corresponding cam, and the minor axis of the elliptical track matching the diameter of the cam. The cam is fitted in the elliptical track, and the rotating shaft rotates to drive the cam to slide along the elliptical track, pushing the booster rod to make linear motion.

4. A multi-stage booster pump according to claim 3, characterized in that, The multistage booster pump also includes at least two bearings, each of which is mounted on a corresponding cam.

5. A multi-stage booster pump according to claim 1, characterized in that, The projection lines of the convex directions of at least two cams onto the cross-section of the rotating shaft evenly divide the cross-section of the rotating shaft.

6. A multi-stage booster pump according to claim 1, characterized in that, At least two cams include a first cam and a second cam, which are fixedly mounted on the rotating shaft at a distance from each other; At least two superchargers, including a first supercharger and a second supercharger; At least two linkage structures include a first linkage structure and a second linkage structure; The first linkage structure is an elliptical track on the first booster component, and the second linkage structure is an elliptical track on the second booster component. The first cam is sleeved in the first linkage structure, and the second cam is sleeved in the second linkage structure.

7. A multi-stage booster pump according to claim 6, characterized in that, The multi-stage cylinder block includes a first-stage cylinder block, a second-stage cylinder block, a third-stage cylinder block, and a fourth-stage cylinder block. The first-stage cylinder block, the second-stage cylinder block, the third-stage cylinder block, and the fourth-stage cylinder block are connected sequentially according to their stage numbers. Each stage cylinder block has an inlet and an outlet at its end. The outlet of the previous stage cylinder block is connected to the inlet of the next stage cylinder block. An inlet check valve is provided at the inlet, and an outlet check valve is provided at the outlet.

8. A multi-stage booster pump according to claim 7, characterized in that, The first booster includes a first booster rod and a first-stage piston and a second-stage piston located at both ends of the first booster rod. The first-stage piston is movably disposed in the first-stage cylinder body, and the second-stage piston is movably disposed in the second-stage cylinder body. The first booster includes a second booster rod and a third-stage piston and a fourth-stage piston located at both ends of the second booster rod. The third-stage piston is movably disposed in the third-stage cylinder, and the fourth-stage piston is movably disposed in the fourth-stage cylinder.

9. A multi-stage booster pump according to claim 7, characterized in that, The inner diameters of the first-stage, second-stage, third-stage, and fourth-stage cylinder blocks decrease sequentially according to the stage number; or The first-stage cylinder block and the second-stage cylinder block have the same inner diameter, and the third-stage cylinder block and the fourth-stage cylinder block have the same inner diameter. Furthermore, the inner diameters of the first-stage cylinder block and the second-stage cylinder block are larger than the inner diameters of the third-stage cylinder block and the fourth-stage cylinder block.

10. A pressure calibrator, characterized in that, The pressure calibrator includes a multi-stage booster pump as described in any one of claims 1 to 9.

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