An electric pressure pump and pressure calibrator

Abstract

The utility model provides a kind of electric pressure pump and pressure calibrator, comprising: body, driving mechanism, crankshaft assembly, supercharging assembly, connecting rod and cylinder body;Crankshaft assembly is rotatably arranged on body;Driving mechanism is used to drive crankshaft assembly rotation;Supercharging assembly includes piston rod and piston, piston is movably arranged in cylinder body inner cavity, and the cylinder body inner cavity is divided into two volume variable cavities, one end of piston rod is deeply into one of the cavities and is fixedly connected with piston, the other end extends out of cylinder body;Connecting rod, its first end is pivoted to crankshaft assembly, second end is pivoted to piston rod by pivot, and is used to convert the rotary motion of crankshaft assembly into the linear motion of piston along cylinder body inner cavity.The utility model realizes the miniaturization design of supercharging pump, and high pressure can be quickly output by low-power motor, and the supercharging efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of pressure pump technology, and in particular to an electric pressure pump and a 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 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-flow rates in industrial applications, resulting in 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 the pump body proportionally. However, these electric pumps mostly use a single-cylinder booster method, and reducing the size of the pump body will lead to a significant decrease in booster efficiency, affecting calibration efficiency. If the pump body is increased in size, it will contradict the miniaturization requirement, and it will be 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 pressure pump that can increase pressure to meet the needs of automated, miniaturized, and automatic calibration devices for pressure instruments. Utility Model Content

[0004] To address at least one of the aforementioned technical problems, this utility model proposes an electric pressure pump and pressure calibrator that can quickly 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 utility model proposes an electric pressure pump, comprising: a body, a drive mechanism, a crankshaft assembly, a booster assembly, a connecting rod, and a cylinder; The crankshaft assembly is rotatably mounted on the body; The drive mechanism is used to drive the crankshaft assembly to rotate; The booster assembly includes a piston rod and a piston. The piston is movably disposed in the inner cavity of the cylinder and divides the inner cavity of the cylinder into two cavities with variable volumes. One end of the piston rod extends into one of the cavities and is fixedly connected to the piston, while the other end extends out of the cylinder. The connecting rod has its first end pivotally connected to the crankshaft assembly and its second end pivotally connected to the piston rod via a pivot, and is used to convert the rotational motion of the crankshaft assembly into the linear motion of the piston along the cylinder cavity.

[0006] Furthermore, in the two variable-volume cavities, each cavity is provided with an inlet and an outlet, with an inlet check valve at the inlet and an outlet check valve at the outlet. The outlet of the cavity that does not penetrate the piston rod is connected to the inlet of the cavity that penetrates the piston rod through a pipeline.

[0007] Furthermore, it also includes a sealing structure, which is fixed to the cylinder body and slidably sleeved on the piston rod, for sealing the gap between the piston rod and the cylinder body, so that the cavity extending into the piston rod remains sealed.

[0008] Furthermore, the crankshaft assembly includes a rotating shaft, a crank, and a crankshaft. The rotating shaft is rotatably mounted on the body, and the rotating shaft and the crankshaft are respectively fixed on both sides of the crank. The axes of the rotating shaft and the crankshaft are misaligned. The drive assembly drives the rotating shaft to rotate, thereby causing the crankshaft to rotate relative to the axis of the rotating shaft.

[0009] Furthermore, the first end of the connecting rod has a first pivot hole, through which the crankshaft passes. The rotating shaft rotates to drive the crankshaft to perform crankshaft motion, which in turn drives the piston rod to perform linear motion via the connecting rod.

[0010] Furthermore, it also includes an auxiliary shaft and an auxiliary crank. One end of the auxiliary shaft is rotatably mounted on the main body, and the other end is fixedly connected to the auxiliary crank. The auxiliary shaft is coaxial with the main body, and the crank shaft is fixedly connected between the auxiliary crank and the main body.

[0011] Furthermore, there are at least two supercharger components and at least two cylinder blocks, with each supercharger component and cylinder block corresponding to one another.

[0012] Furthermore, at least two booster components include a first booster component and a second booster component; At least two cylinder blocks include a first cylinder block and a second cylinder block, wherein the first cylinder block has a first cylinder block inner cavity and the second cylinder block has a second cylinder block inner cavity; The second end of the connecting rod has a second pivot hole, the pivot passes through the second pivot hole, and the two ends are respectively connected to the first booster assembly and the second booster assembly.

[0013] Furthermore, the first booster assembly includes a first piston and a first piston rod, wherein the first-stage piston is movably disposed in the inner cavity of the first cylinder and divides the inner cavity of the first cylinder into a first-stage cavity and a second-stage cavity with variable volume; The second booster assembly includes a second piston and a second piston rod. The second-stage piston is movably disposed in the inner cavity of the second cylinder and divides the inner cavity of the second cylinder into a third-stage cavity and a fourth-stage cavity with variable volumes. The first-level cavity, the second-level cavity, the third-level cavity, and the fourth-level cavity are connected sequentially according to their level numbers. Each cavity has an inlet and an outlet, and the outlet of the previous cavity is connected to the inlet of the next cavity. The variable volumes of the first-stage cavity, second-stage cavity, third-stage cavity, and fourth-stage cavity decrease sequentially according to the stage number; or The variable volume of the first-stage cavity is greater than that of the second-stage cavity, the variable volume of the second-stage cavity is equal to that of the third-stage cavity, and the variable volume of the third-stage cavity is greater than that of the fourth-stage cavity.

[0014] This utility model also proposes a pressure calibrator, which includes an electric pressure pump, a controller, and a pressure interface. The controller is used to control the electric pressure pump to increase or decrease the pressure to a preset target pressure, and the pressure interface is used to connect the instrument to be tested.

[0015] This invention relates to an electric pressure pump and pressure calibrator. A motor drives a rotating shaft, which in turn moves a crankshaft. Simultaneously, with the assistance of a connecting rod, multiple pressure-boosting components move synchronously, enabling multi-stage pressure boosting through multiple chambers. This invention achieves a miniaturized design for the booster pump 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 this 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 an electric pressure pump according to the present invention is shown from one perspective. Figure 2 yes Figure 1 A three-dimensional schematic diagram of an electric pressure pump from another perspective; Figure 3 yes Figure 1 The electric pressure pump is shown in the front view; Figure 4 yes Figure 3 A cross-sectional view of an electric pressure pump along section line AA. Figure 5yes Figure 3 A cross-sectional view of the electric pressure pump along the BB section line.

[0018] Figure label: Electric pressure pump 100; Body 10, first pipeline 11, second pipeline 12; Drive mechanism 20, motor 21, drive pulley 211, transmission belt 22, driven pulley 23; Crankshaft assembly 30, shaft 31, crank 32, crankshaft 33, auxiliary shaft 34, auxiliary crank 35; First booster assembly 41, first piston rod 411, first piston 412, second booster assembly 42, second piston rod 421, second piston 422; Connecting rod 50, first end 51, first pivot hole 511, second end 52, second pivot hole 521, pivot 53; Cylinder 60, first cylinder 61, first stage chamber 611, first inlet 6111, first outlet 6112, first outlet check valve 6114, second stage chamber 612, second inlet 6121, second outlet 6122, second inlet check valve 6123, second cylinder 62, third stage chamber 621, third inlet 6211, third outlet 6212, third outlet check valve 6214, fourth stage chamber 622, fourth inlet 6221, fourth outlet 6222, fourth inlet check valve 6223; Sealing structure 70; 80; Bearing 90. Detailed Implementation

[0019] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model 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 present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0021] like Figures 1 to 5 As shown, this utility model proposes an electric pressure pump 100, including: a body 10, a drive mechanism 20, a crankshaft assembly 30, a booster assembly 41, 42, a connecting rod 50, and a cylinder 60. The crankshaft assembly 30 is rotatably mounted on the body 10; The drive mechanism 20 is used to drive the crankshaft assembly 30 to rotate; The booster components 41 and 42 include piston rods 411 and 421 and pistons 412 and 422. Pistons 412 and 422 are movably disposed in the inner cavity of cylinder 60 and divide the inner cavity of cylinder into two cavities 611 and 612 or 621 and 622 with variable volumes. One end of piston rod 411 and 421 extends into one of the cavities and is fixedly connected to piston 412 and 422, while the other end extends out of cylinder 60. The connecting rod 50 has its first end 51 pivotally connected to the crankshaft assembly 30, and its second end 52 pivotally connected to the piston rods 411 and 421 via a pivot 53. It is used to convert the rotational motion of the crankshaft assembly 30 into the linear motion of the pistons 412 and 422 along the inner cavity of the cylinder.

[0022] In the two cavities with variable volumes, each cavity is provided with an inlet and an outlet. An inlet check valve is provided at the inlet and an outlet check valve is provided at the outlet. The outlet of the cavity that does not penetrate into the piston rod 41 is connected to the inlet of the cavity that penetrates into the piston rod 411 and 421 through a pipe 11 or 12.

[0023] According to an embodiment of this utility model, the inner cavity of the cylinder 60 is a cylindrical cavity, the piston rods 411 and 421 are cylindrical, and the pistons 412 and 422 are disc-shaped. The cross-sectional shape and size of the inner cavity of the cylinder are adapted to the cross-sectional shape and size of the pistons. The cross-sectional area of ​​the inner cavity of the cylinder is greater than the cross-sectional area of ​​the piston rod. The cross-sectional area of ​​the cavity that does not penetrate the piston rod is equal to the cross-sectional area of ​​the inner cavity of the cylinder, while the cross-sectional area of ​​the cavity that penetrates the piston rod is equal to the cross-sectional area of ​​the inner cavity of the cylinder minus the cross-sectional area of ​​the piston rod.

[0024] It is understandable that since one-way valves are installed between the cavity that does not penetrate the piston rod and the cavity that penetrates the piston rod, this ensures that the pressure is forced from the larger volume of the lower-level cavity (i.e., the cavity that does not penetrate the piston rod) into the smaller volume of the higher-level cavity (i.e., the cavity that penetrates the piston rod) without backflow, thus achieving the effect of step-by-step pressurization.

[0025] Pistons 412 and 422 reciprocate linearly within the cylinder 60 under the drive of piston rods 411 and 421. When the pistons move away from the linkage mechanism 50, the cavities not deep within piston rods 411 and 421 gradually decrease in size, while the cavities deep within piston rods 411 and 421 gradually increase in size. The medium in the cavities not deep within piston rods 411 and 421 is forced into the cavities deep within piston rods. Since the cross-sectional area of ​​the cavities deep within piston rods 411 and 421 is smaller than that of the cavities not deep within piston rods, the increase in volume of the cavities deep within piston rods 411 and 421 per unit distance traveled by pistons 412 and 422 is less than the decrease in volume of the cavities not deep within piston rods 411 and 421.

[0026] According to an embodiment of the present invention, the electric pressure pump 100 further includes a sealing structure 70, which is fixed on the cylinder 60 and slidably sleeved on the piston rods 411 and 421, for sealing the gap between the piston rods 411 and 421 and the cylinder 60, so that the cavity extending into the piston rod remains sealed.

[0027] According to an embodiment of the present invention, the electric pressure pump 100 further includes a cover 80, which is fixedly disposed on the side of the cylinder 60 away from the sealing structure 70, and is used to block the cavity that does not penetrate into the piston rod and keep it in a sealed state.

[0028] Furthermore, the crankshaft assembly 30 includes a rotating shaft 31, a crank 32, and a crankshaft 33. The rotating shaft 31 is rotatably mounted on the body 10. The rotating shaft 31 and the crankshaft 33 are respectively fixed on both sides of the crank 32, and the axes of the rotating shaft 31 and the crankshaft 33 are misaligned. The drive assembly 20 drives the rotating shaft 31 to rotate, thereby causing the crankshaft 33 to rotate relative to the axis of the rotating shaft 31.

[0029] Furthermore, the first end 51 of the connecting rod 50 is provided with a first pivot hole 511, and the crankshaft 33 passes through the first pivot hole 511. The rotating shaft 31 rotates to drive the crankshaft 33 to perform crankshaft motion, and the connecting rod 50 pushes the piston rods 411 and 421 to perform linear motion.

[0030] According to a specific embodiment of this utility model, the electric pressure pump 100 further includes a bearing 90, the inner ring of which is sleeved on the crankshaft 33. It can be understood that by sleeved the bearing 90 on the crankshaft 33, rotational wear between the crankshaft 33 and the first pivot hole 511 can be reduced, thereby improving service life.

[0031] According to an embodiment of the present invention, the crankshaft assembly 30 further includes an auxiliary rotating shaft 34 and an auxiliary crank 35. One end of the auxiliary rotating shaft 34 is rotatably disposed on the body 10, and the other end is fixedly connected to the auxiliary crank 35. The auxiliary rotating shaft 34 and the rotating shaft 31 are coaxially arranged. The crank shaft 33 is fixedly connected between the auxiliary crank 35 and the crank 32, and the axis of the crank shaft 33 is parallel to the coaxial axis of the auxiliary rotating shaft 34 and the rotating shaft 31.

[0032] It is understandable that by coordinating the auxiliary shaft 34 and auxiliary crank 35 with the synchronous movement of the shaft 31 and crank 32, the stability of the crankshaft 33 in crankshaft movement can be effectively improved, thereby enhancing the stability of the boost.

[0033] Furthermore, the interfaces between crank 32 and auxiliary crank 35 are respectively umbrella-shaped, with shaft 31 vertically fixed between the top and bottom of the umbrella on crank 32, and auxiliary shaft 34 vertically fixed between the top and bottom of the umbrella on auxiliary crank 35. Crank 32 and auxiliary crank 35 are arranged in parallel and in the same direction. The two ends of crank shaft 33 are fixedly connected between the bottom of the umbrella of crank 32 and the bottom of the umbrella of auxiliary crank 35, respectively. Since crank shaft 33 is fixed at the bottom of the umbrella and crank shaft 33 is offset from the axis of rotating shaft 31, in order to balance the weight on both sides of the axis of rotating shaft 31, the area of ​​the top of the umbrella of crank 32 and auxiliary crank 35 is made larger than the area of ​​the corresponding bottom of the umbrella. That is, the weight of the top of the umbrella of crank 32 and auxiliary crank 35 is greater than the weight of the bottom of the umbrella. In this way, the weight of crank shaft 33 is balanced by the extra weight of the top of the umbrella of crank 32 and auxiliary crank 35 compared to the bottom of the umbrella, thereby achieving the balance of the rotation of rotating shaft 31, reducing the wear caused by unbalanced rotation of rotating shaft 31, and improving the stability of electric pressure pump.

[0034] According to the embodiments of this utility model, there are at least two booster components 41 and 42 and at least two cylinders 60, and at least two booster components 41 and 42 and at least two cylinders 60 correspond one-to-one.

[0035] Furthermore, At least two booster components include a first booster component 41 and a second booster component 42; At least two cylinder blocks include a first cylinder block 61 and a second cylinder block 62, wherein the first cylinder block 61 has a first cylinder inner cavity and the second cylinder block 62 has a second cylinder inner cavity. The second end 52 of the connecting rod 50 has a second pivot hole 521, the pivot 53 passes through the second pivot hole 521, and the two ends are respectively connected to the first booster assembly 41 and the second booster assembly 42.

[0036] The first booster assembly 41 and the second booster assembly 42 are located on the same side of the crankshaft 33. When the crankshaft 33 rotates, the first booster assembly 41 and the second booster assembly 42 are driven to run synchronously and in the same direction under the cooperation of the crankshaft 33 and the connecting rod 50.

[0037] Furthermore, the first booster assembly 41 includes a first piston 412 and a first piston rod 411. The first-stage piston 412 is movably disposed in the inner cavity of the first cylinder 61 and divides the inner cavity of the first cylinder 61 into a first-stage cavity 611 and a second-stage cavity 612 with variable volume. The second booster assembly 42 includes a second piston 422 and a second piston rod 421. The second-stage piston 422 is movably disposed in the inner cavity of the second cylinder 62 and divides the inner cavity of the second cylinder 62 into a third-stage cavity 621 and a fourth-stage cavity 622 with variable volumes. The first-level cavity 611, the second-level cavity 612, the third-level cavity 621 and the fourth-level cavity 622 are connected in sequence according to the level number. Each cavity has an inlet and an outlet. The outlet of the previous cavity is connected to the inlet of the next cavity. The variable volumes of the first-stage cavity 611, the second-stage cavity 612, the third-stage cavity 621, and the fourth-stage cavity 622 decrease sequentially according to the stage number; or The variable volume of the first-stage cavity 611 is greater than the variable volume of the second-stage cavity 612, the variable volume of the second-stage cavity 612 is equal to the variable volume of the third-stage cavity 621, and the variable volume of the third-stage cavity 621 is greater than the variable volume of the fourth-stage cavity 622.

[0038] It is understandable that an inlet check valve is installed at the entrance of each cavity, and an outlet check valve is installed at the exit of each cavity.

[0039] In a specific embodiment, the first-stage cavity 611 has a first inlet 6111 and a first outlet 6112 on the side away from the second-stage cavity 612; a first inlet check valve (not shown) is provided at the first inlet 6111, and a first outlet check valve 6114 is provided at the first outlet 6112. When the internal volume of the first-stage cavity 611 increases, the internal pressure of the first-stage cavity 611 decreases, and external gas can enter the first-stage cavity 611 through the first inlet check valve, completing the intake action of the first-stage cavity 611. Since the first outlet check valve 6114 is in the opposite direction to the first inlet check valve, the first outlet check valve 6114 is in the closed state at this time, that is, the gas in the second-stage cavity 612 will not flow back to the first-stage cavity 611. When the volume of the first-stage cavity 611 decreases, the pressure inside the first-stage cavity 611 increases. The gas inside the first-stage cavity 611 can then push open the first outlet check valve 6114 and enter the second-stage cavity 612, completing the pressurization action of the first-stage cavity 611. Since the first inlet check valve and the first outlet check valve 6114 are in opposite directions, the first inlet check valve is closed at this time, and the gas in the first-stage cavity 611 will not be discharged to the outside through the first inlet 6111.

[0040] The second-stage cavity 612 has a second inlet 6121 and a second outlet 6122 on the side away from the first-stage cavity 611; a second inlet check valve 6123 is provided at the second inlet 6121, and a second outlet check valve is provided at the second outlet 6122 (not shown in the figure). A first pipe 11 is provided on one side wall of the corresponding first cylinder 61 on the main body 10, and the first pipe 11 connects the first outlet 6112 of the first-stage cavity 611 and the second inlet 6121 of the second-stage cavity 612. When the volume of the second-stage cavity 612 expands, the pressure inside the second-stage cavity 612 decreases, and the gas in the first-stage cavity 611 can enter the second-stage cavity 612 through the second inlet check valve 6123, completing the intake action of the second-stage cavity 612. Since the second outlet check valve is opposite to the second inlet check valve 6123, the second outlet check valve is closed at this time, that is, the gas in the third-stage cavity 621 will not flow back to the second-stage cavity 612. When the volume of the second-stage cavity 612 decreases, the pressure inside the second-stage cavity 612 increases. The gas in the second-stage cavity 612 can then push open the second outlet check valve and enter the third-stage cavity 621, completing the pressurization action of the second-stage cavity 612. Since the second inlet check valve 6123 and the second outlet check valve are in opposite directions, the second inlet check valve 6123 is closed at this time, and the gas in the second-stage cavity 612 will not flow back to the first-stage cavity 611 through the second inlet 6121.

[0041] In a specific embodiment, the third-stage cavity 621 has a third inlet 6211 and a third outlet 6212 on the side away from the fourth-stage cavity 622. A third inlet check valve (not shown) is provided at the third inlet 6211, and a third outlet check valve 6214 is provided at the third outlet 6212. The third inlet 6211 of the third-stage cavity 621 is connected to the second outlet 6122 of the second-stage cavity 612 through an external pipeline (not shown). When the internal volume of the third-stage cavity 621 increases, the internal pressure of the third-stage cavity 621 decreases, and the gas in the second-stage cavity 612 can enter the third-stage cavity 621 through the third inlet check valve, completing the intake action of the third-stage cavity 621. Since the third outlet check valve 6214 is in the opposite direction to the third inlet check valve, the third outlet check valve 6214 is in the closed state at this time, that is, the gas in the third-stage cavity 621 will not flow back to the second-stage cavity 612. When the volume of the third-stage cavity 621 decreases, the pressure inside the third-stage cavity 621 increases. The gas in the third-stage cavity 621 can then push open the third outlet check valve 6214 to enter the fourth-stage cavity 622, completing the pressurization action of the third-stage cavity 621. Since the third inlet check valve and the third outlet check valve 6214 are in opposite directions, the third inlet check valve is closed at this time, and the gas in the third-stage cavity 621 will not return to the second-stage cavity 612 through the third inlet 6211.

[0042] The fourth-stage cavity 622 has a fourth inlet 6221 and a fourth outlet 6222 on the side away from the third-stage cavity 621; a fourth inlet check valve 6223 is provided at the fourth inlet 6221, and a fourth outlet check valve (not shown) is provided at the fourth outlet 6222. A second pipe 12 is provided on one side wall of the corresponding second cylinder 62 on the main body 10, and the second pipe 12 connects the third outlet 6212 of the third-stage cavity 621 and the fourth inlet 6221 of the fourth-stage cavity 622. When the volume of the fourth-stage cavity 622 expands, the pressure inside the fourth-stage cavity 622 decreases, and the gas in the third-stage cavity 621 can enter the fourth-stage cavity 622 through the fourth inlet check valve 6223, completing the intake action of the fourth-stage cavity 622. Since the fourth outlet check valve is opposite to the fourth inlet check valve 6223, the fourth outlet check valve is in the closed state at this time, that is, the high-pressure gas in the external output pipeline will not flow back to the fourth-stage cavity 622. When the volume of the fourth-stage cavity 622 decreases, the pressure inside the fourth-stage cavity 622 increases. The gas inside the fourth-stage cavity 622 can then push open the fourth outlet check valve and enter the external output pipeline, completing the pressurization action of the fourth-stage cavity 622. Since the fourth inlet check valve 6223 and the fourth outlet check valve are in opposite directions, the fourth inlet check valve 6223 is closed at this time, and the gas in the fourth-stage cavity 622 will not flow back to the third-stage cavity 621 through the fourth inlet 6221.

[0043] According to a specific embodiment of the present invention, the drive mechanism 20 includes a motor 21 and a transmission belt 22. The motor 21 is provided with a drive wheel 211, and one end of the rotating shaft 31 extends out of the body 10 and is connected to a driven wheel 23. The transmission belt 22 is respectively sleeved between the drive wheel 211 and the driven wheel 23.

[0044] Preferably, the diameter of the driven wheel 23 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 23 larger than the diameter of the driving wheel 211, the torque of the shaft 31 can be increased. A smaller power motor 21 can be used to achieve a larger output torque of the shaft 31, which is beneficial to increasing the maximum pressure value after multi-stage pressurization.

[0045] To further explain the electric pressure pump of this utility model, its working principle is described in detail below.

[0046] Motor 21 drives drive wheel 211 to rotate, which in turn drives driven wheel 23 to rotate via transmission belt 22, thereby driving shaft 31 to rotate. The rotation of shaft 31 drives crankshaft 33 to move, which in turn drives pivot 53 to move linearly via connecting rod 50. This, in turn, drives first piston rod 411 of first booster assembly 41 to move linearly, and causes first piston 412 to slide within the first cylinder 61, causing the volume of first-stage chambers 611 and second-stage chambers 612 on both sides of first piston 412 to increase or decrease. Similarly, pivot 53 synchronously drives second piston rod 421 of second booster assembly 42 to move linearly, and causes second piston 422 to slide within the second cylinder 62, causing the volume of third-stage chambers 621 and fourth-stage chambers 622 on both sides of second piston 422 to increase or decrease. Specifically, under the constraints of the above structure, taking one revolution of the rotating shaft 31 as a cycle, when the inner volume of the first-stage cavity 611 gradually increases, the inner volume of the second-stage cavity 612 gradually decreases, the inner volume of the third-stage cavity 621 gradually increases, and the inner volume of the fourth-stage cavity 622 gradually decreases; similarly, when the inner volume of the first-stage cavity 611 gradually decreases, the inner volume of the second-stage cavity 612 gradually increases, the inner volume of the third-stage cavity 621 gradually decreases, and the inner volume of the fourth-stage cavity 622 gradually increases.

[0047] Specifically, when the volume of the first-stage cavity 611 increases, the pressure inside the first-stage cavity 611 decreases, and external gas can enter the first-stage cavity 611 through the first inlet check valve to complete the intake action of the first-stage cavity 611. Since the first outlet check valve 6114 is opposite to the first inlet check valve, the first outlet check valve 6114 is in the closed state at this time, that is, the gas in the second-stage cavity 612 will not flow back to the first-stage cavity 611. Simultaneously, the volume of the second-stage chamber 612 decreases, and the pressure within it increases. This allows the gas in the second-stage chamber 612 to push open the second outlet check valve and enter the third-stage chamber 621, thus pressurizing the second-stage chamber 612. Since the second inlet check valve 6123 and the second outlet check valve operate in opposite directions, the second inlet check valve 6123 is closed at this time, preventing the gas in the second-stage chamber 612 from flowing back to the first-stage chamber 611 through the second inlet 6121. Similarly, the volume of the third-stage chamber 621 increases, receiving the pressurized gas from the second-stage chamber 612. The volume of the fourth-stage chamber 622 decreases, performing a fourth-stage pressurization operation and delivering the pressurized gas to the output pipe.

[0048] When the volume of the first-stage chamber 611 decreases, the pressure inside the first-stage chamber 611 increases. The gas inside the first-stage chamber 611 can then push open the first outlet check valve 6114 to enter the second-stage chamber 612, completing the pressurization action of the first-stage chamber 611. Since the first inlet check valve and the first outlet check valve 6114 are in opposite directions, the first inlet check valve is closed at this time, and the gas in the first-stage chamber 611 will not be discharged to the outside through the first inlet 6111. Simultaneously, the volume of the second-stage chamber 612 increases, and the pressure inside the second-stage chamber 612 decreases. The gas in the first-stage chamber 611 can then enter the second-stage chamber 612 through the second inlet check valve 6123, completing the intake action of the second-stage chamber 612. Since the second outlet check valve and the second inlet check valve 6123 are in opposite directions, the second outlet check valve is closed at this time, meaning that the gas in the third-stage chamber 621 will not flow back to the second-stage chamber 612. Similarly, at this time, the inner volume of the third-stage cavity 621 decreases, and the third-stage pressurization action is performed, while the inner volume of the fourth-stage cavity 622 increases, receiving the gas pressurized from the third-stage cavity 621.

[0049] It is understandable that, since the inner diameters of the first-stage cavity 611, the second-stage cavity 612, the third-stage cavity 621, and the fourth-stage cavity 622 decrease sequentially according to the stage number, the effect of step-by-step pressurization can be achieved when the rotating shaft 31 rotates.

[0050] It is understood that the electric pressure pump of this utility model can be used to boost or depressurize gas or liquid to output high or low pressure gas or liquid.

[0051] It is understandable that when the motor rotates forward, it can output positive pressure, and when the motor rotates in reverse, it can output negative pressure.

[0052] This invention relates to an electric pressure pump that uses a motor to drive a rotating shaft, which in turn drives a crankshaft. Simultaneously, with the assistance of a connecting rod, multiple pressure-boosting components move synchronously, enabling multi-stage pressure boosting through multiple chambers. This invention achieves a miniaturized design for the booster pump and can quickly output high pressure using a low-power motor, meeting the miniaturization and integration requirements of automatic pressure gauge calibration devices.

[0053] This utility model also proposes a pressure calibrator, which includes the aforementioned electric pressure pump, controller, and pressure interface. The controller is used to control the electric pressure pump to increase or decrease the pressure to a preset target pressure. The pressure interface is used to connect to the pressure instrument to be tested. The pressure calibrator outputs a calibration pressure to the instrument to be tested by rapidly increasing or decreasing the pressure through the electric pressure pump.

[0054] It should be noted that the rotatable connection described in this utility model 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.

[0055] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model 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 this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An electric pressure pump, characterized in that, include: Body, drive mechanism, crankshaft assembly, supercharger assembly, connecting rods, and cylinder block; The crankshaft assembly is rotatably mounted on the body; The drive mechanism is used to drive the crankshaft assembly to rotate; The booster assembly includes a piston rod and a piston. The piston is movably disposed in the inner cavity of the cylinder and divides the inner cavity of the cylinder into two cavities with variable volumes. One end of the piston rod extends into one of the cavities and is fixedly connected to the piston, while the other end extends out of the cylinder. The connecting rod has its first end pivotally connected to the crankshaft assembly and its second end pivotally connected to the piston rod via a pivot, and is used to convert the rotational motion of the crankshaft assembly into the linear motion of the piston along the cylinder cavity.

2. The electric pressure pump according to claim 1, characterized in that, Each of the two variable-volume cavities has an inlet and an outlet. An inlet check valve is installed at the inlet, and an outlet check valve is installed at the outlet. The outlet of the cavity that does not penetrate the piston rod is connected to the inlet of the cavity that penetrates the piston rod through a pipeline.

3. An electric pressure pump according to claim 1, characterized in that, It also includes a sealing structure, which is fixed to the cylinder body and slidably sleeved on the piston rod, for sealing the gap between the piston rod and the cylinder body, so that the cavity extending into the piston rod remains sealed.

4. An electric pressure pump according to claim 1, characterized in that, The crankshaft assembly includes a rotating shaft, a crank, and a crankshaft. The rotating shaft is rotatably mounted on the body. The rotating shaft and the crankshaft are respectively fixed on both sides of the crank, and the axes of the rotating shaft and the crankshaft are misaligned. The drive assembly drives the rotating shaft to rotate, thereby causing the crankshaft to rotate relative to the axis of the rotating shaft.

5. An electric pressure pump according to claim 4, characterized in that, The first end of the connecting rod has a first pivot hole, through which the crankshaft passes. The rotating shaft rotates to drive the crankshaft to perform crankshaft motion, which in turn drives the piston rod to perform linear motion through the connecting rod.

6. An electric pressure pump according to claim 4, characterized in that, It also includes an auxiliary shaft and an auxiliary crank. One end of the auxiliary shaft is rotatably mounted on the main body, and the other end is fixedly connected to the auxiliary crank. The auxiliary shaft is coaxial with the main shaft, and the crank shaft is fixedly connected between the auxiliary crank and the main shaft.

7. An electric pressure pump according to claim 4, characterized in that, There are at least two booster components and at least two cylinder blocks, with each booster component and cylinder block corresponding to one another.

8. An electric pressure pump according to claim 7, characterized in that, At least two booster components, including a first booster component and a second booster component; At least two cylinder blocks include a first cylinder block and a second cylinder block, wherein the first cylinder block has a first cylinder block inner cavity and the second cylinder block has a second cylinder block inner cavity; The second end of the connecting rod has a second pivot hole, the pivot passes through the second pivot hole, and the two ends are respectively connected to the first booster assembly and the second booster assembly.

9. An electric pressure pump according to claim 8, characterized in that, The first booster assembly includes a first piston and a first piston rod. The first-stage piston is movably disposed in the inner cavity of the first cylinder and divides the inner cavity of the first cylinder into a first-stage cavity and a second-stage cavity with variable volume. The second booster assembly includes a second piston and a second piston rod. The second-stage piston is movably disposed in the inner cavity of the second cylinder and divides the inner cavity of the second cylinder into a third-stage cavity and a fourth-stage cavity with variable volumes. The first-level cavity, the second-level cavity, the third-level cavity, and the fourth-level cavity are connected sequentially according to their level numbers. Each cavity has an inlet and an outlet, and the outlet of the previous cavity is connected to the inlet of the next cavity. The variable volumes of the first-stage cavity, second-stage cavity, third-stage cavity, and fourth-stage cavity decrease sequentially according to the stage number; or The variable volume of the first-stage cavity is greater than that of the second-stage cavity, the variable volume of the second-stage cavity is equal to that of the third-stage cavity, and the variable volume of the third-stage cavity is greater than that of the fourth-stage cavity.

10. A pressure calibrator, characterized in that, The pressure calibrator includes an electric pressure pump, a controller, and a pressure interface as described in any one of claims 1 to 9. The controller is used to control the electric pressure pump to increase or decrease the pressure to a preset target pressure, and the pressure interface is used to connect the instrument under test.

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