Adjustable speed infusion pump and method of use

Abstract

The application discloses a speed-adjustable liquid injection pump and a use method thereof, and relates to the field of fluid conveying equipment. The pump comprises a shell, a double-shell assembly, a transmission assembly and a fluid channel. The double-shell assembly is rotationally connected through a connecting bearing. The transmission assembly comprises a sun gear assembly, a planetary gear assembly and a transmission belt. By adjusting the position of a moving wheel, the transmission ratio is changed, so that the double-shell assembly rotates at the same speed or at different speeds. The fluid channel is arranged corresponding to the rolling rod outside the inner shell. By adjusting the rotating speed of the inner shell, the independent control of the pressure of multiple channels is realized. The application solves the problems of pressure fluctuation of the existing pump head and single function, and can realize stepless / multi-stage adjustment of the injection and negative pressure suction pressure, and is suitable for fluid conveying scenes in the fields of medical treatment, chemical industry and the like.

Description

Technical Field

[0001] This invention relates to the field of fluid transport equipment technology, specifically to an adjustable speed injection pump and its usage method. Background Technology

[0002] Existing water-air pump heads mainly provide pressure for either water or air alone, such as Figure 5 As shown, different output pressures are provided by adjusting the rotation speed of the pump head, but there are the following drawbacks: First, the pump head provides pressure by rolling on the hose through the hub, which is prone to pressure fluctuations and poor output stability; Second, the function is limited, and it can only provide single-channel pressure or dual-channel unidirectional pressure, and cannot achieve independent adjustment of multi-channel pressure. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides an adjustable speed injection pump and its usage method, overcoming the defects of unstable pump head pressure and single function in existing pumps, and providing an adjustable speed injection pump that can achieve independent pressure adjustment of multiple channels.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An adjustable speed injection pump includes: a housing, wherein a double inner housing assembly is provided inside the housing and is rotatable relative to each other;

[0006] A transmission assembly is disposed inside the double inner shell assembly and is used to drive the double inner shell assembly to achieve rotation at the same speed or differential speed.

[0007] At least two fluid channels are provided on the outer side of the dual inner shell assembly;

[0008] The dual inner shell assembly enables independent pressure regulation of each fluid channel through rotational speed adjustment.

[0009] Furthermore, the double inner shell assembly includes an inner shell one and an inner shell two, which are rotatably connected by a connecting bearing.

[0010] Furthermore, the transmission assembly includes a sun gear assembly, a planetary gear assembly, and a transmission belt; the sun gear assembly is driven to the inner shell one, and the planetary gear assembly is driven to the inner shell two.

[0011] Furthermore, the sun gear assembly includes a fixed sun gear, a movable sun gear, and a movable sun gear pusher for driving the movable sun gear; the planet gear assembly includes fixed planet gears, movable planet gears, and a movable planet gear pusher for driving the movable planet gears.

[0012] Furthermore, the outer surfaces of the fixed sun gear and the movable sun gear, as well as the fixed planet gear and the movable planet gear, are all designed as tapered inclined surfaces. The transmission belt is attached to the tapered inclined surface and adjusts the transmission ratio as the position of the movable wheel changes.

[0013] Furthermore, a first rolling rod is provided on the outside of the first inner shell, and a second rolling rod is provided on the outside of the second inner shell; the fluid channel includes an injection tube and a suction tube, the injection tube being arranged corresponding to the second rolling rod, and the suction tube being arranged corresponding to the first rolling rod.

[0014] Furthermore, the sun gear assembly and the planet gear assembly are connected by anti-sway bearings and connecting rods, with the anti-sway bearings fitted onto the outside of the sun gear rod and the planet gear rod.

[0015] Furthermore, the rotational speed of the dual inner shell assembly is infinitely adjustable or multi-stage adjustable.

[0016] The present invention also provides a method for using an adjustable speed injection pump, comprising the following steps:

[0017] Step 1: Power input and basic transmission start-up:

[0018] The drive device outputs power to the sun gear rod, which drives the inner shell to rotate synchronously. The sun gear rod drives the fixed sun gear and the movable sun gear to rotate. The power is transmitted to the fixed planet gear and the movable planet gear through the transmission belt, so that the planet gear assembly rotates synchronously with the sun gear assembly.

[0019] Step 2: Transmission ratio adjustment and dual-inner-shell speed control:

[0020] An external driving mechanism drives the moving sun gear push tube and the moving planet gear push tube, which in turn causes the moving sun gear to move along the sun gear shaft axis and the moving planet gear to move along the planet gear shaft axis.

[0021] Because the fixed sun gear / moving sun gear and the fixed planet gear / moving planet gear have a conical inclined surface structure, the transmission belt slides on the inclined surface as the position of the moving wheel changes, changing the contact radius ratio between the sun gear assembly and the planet gear assembly, thereby adjusting the transmission ratio:

[0022] When the moving wheel approaches the fixed wheel, the contact radius ratio is 1:1, the transmission ratio is 1, and the inner shell one and the inner shell two rotate at the same speed.

[0023] When the moving wheel moves away from the fixed wheel, the contact radius ratio deviates from 1, the transmission ratio changes, and the inner shell one and inner shell two rotate at different speeds.

[0024] During this process, the anti-sway bearing and connecting rod limit the radial wobble of the sun gear assembly and planet gear assembly, ensuring that the transmission belt fits against the inclined surface of the wheel body;

[0025] Step 3: Pressure output and multi-channel independent adjustment:

[0026] Inner shell one squeezes the suction tube through the first rolling rod, and inner shell two squeezes the injection tube through the second rolling rod. Combined with the difference in rotation speed between the two inner shells, the negative pressure of the suction tube and the injection pressure of the injection tube can be independently adjusted.

[0027] Furthermore, in step 2, the position adjustment of the moving sun gear and the moving planet gear is achieved by pushing the moving sun gear push tube and the moving planet gear push tube, and the change of the transmission ratio is achieved by the sliding of the transmission belt on the conical inclined surface.

[0028] This adjustable-speed injection pump and its usage method have the following beneficial effects:

[0029] This invention, through the combination of a double-inner-shell assembly, an adjustable transmission assembly, and a multi-channel fluid structure, achieves a comprehensive improvement in "pressure stability + functional expansion + precise adjustment" compared to existing technologies, as detailed below:

[0030] More features, enabling independent pressure control across multiple channels.

[0031] Relying on the differential speed adjustment mechanism between inner shell one and inner shell two, the injection tube corresponds to the second rolling rod of inner shell two, and the suction tube corresponds to the first rolling rod of inner shell one. The injection pressure and negative pressure suction pressure can be adjusted independently, which solves the defect of existing pump heads that can only output in a single channel or in a unidirectional dual channel.

[0032] The pressure output is more stable, and the fluctuation range is significantly reduced.

[0033] By adopting a cooperative structure of rolling rods (first rolling rod and second rolling rod) and fluid channel, combined with stable transmission of transmission components (anti-sway bearing + connecting rod to limit sway), the pressure fluctuation problem of existing hub rolling pump heads is avoided, and the coefficient of variation of output pressure can be controlled within 5%.

[0034] More precise adjustments to adapt to different scenario needs

[0035] The design of the tapered inclined surface and the transmission belt in the transmission assembly allows for continuous / gradual changes in the transmission ratio by adjusting the position of the moving wheels (moving sun gear, moving planet gear), thereby enabling stepless or multi-stage speed regulation of the double inner shell assembly to meet the pressure accuracy requirements of different fluid conveying scenarios. Attached Figure Description

[0036] Figure 1 This is an exploded structural diagram of the adjustable speed injection pump of the present invention;

[0037] Figure 2 A schematic diagram of the adjustable speed injection pump of the present invention;

[0038] Figure 3A schematic diagram of the adjustable speed injection pump of the present invention being installed in conjunction with the injection pipe, suction pipe and housing;

[0039] Figure 4 A schematic diagram of the transmission assembly of the adjustable speed injection pump of the present invention.

[0040] Figure 5 This is a structural diagram of an existing injection pump.

[0041] In the diagram: 1. Inner shell one; 11. First rolling rod; 2. Inner shell two; 21. Second rolling rod; 22. Gear ring; 3. Sun gear rod; 31. Fixed sun gear; 32. Moving sun gear; 33. Moving sun gear push tube; 4. Planet gear rod; 41. Fixed planet gear; 42. Moving planet gear; 43. Moving planet gear push tube; 5. Conductor belt; 6. Connecting rod; 61. Anti-sway bearing; 7. Injection tube; 71. Suction tube; 8. Outer shell; 9. Connecting bearing. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0043] Example 1

[0044] like Figures 1-4 An adjustable-speed injection pump includes: a housing 8, within which a double-inner-shell assembly is rotatable; a transmission assembly, disposed inside the double-inner-shell assembly, for driving the double-inner-shell assembly to achieve simultaneous or differential rotation; and at least two fluid channels, correspondingly disposed on the outer sides of the double-inner-shell assembly. The pressure of each fluid channel can be independently adjusted by speed regulation of the double-inner-shell assembly. This design breaks through the functional limitations of existing single-channel or unidirectional dual-channel pump heads, adopting an integrated design of "internal transmission + external channel." This achieves independent pressure control across multiple channels, reduces equipment size through the built-in transmission assembly, and directly links speed regulation to pressure output, laying a structural foundation for precise pressure control and solving the problem of limited functionality in existing pump heads.

[0045] The dual-inner-shell assembly includes inner shell 1 and inner shell 2, which are rotatably connected by a connecting bearing 9. Inner shell 1 is fixedly connected to the outer ring of the connecting bearing 9, and inner shell 2 is fixedly connected to the inner ring of the connecting bearing 9. The connecting bearing 9 enables low-friction relative rotation of the two inner shells, reducing mechanical wear and power loss, and ensuring smooth speed regulation. At the same time, the separate design of the two inner shells allows the speed of each to be controlled independently, providing structural support for subsequent multi-channel pressure differential regulation. Compared with the existing integrated pump head, it completely solves the defect that dual-channel independent speed regulation cannot be achieved.

[0046] The transmission components include a sun gear assembly, planetary gear assemblies, and a drive belt 5. The sun gear assembly is driven to the inner shell 1, and the planetary gear assembly is driven to the inner shell 2. The composite transmission structure of "sun gear-planetary gear-drive belt" has a clear power transmission path and high efficiency. It can convert a single power source into an independent driving force for both inner shells without the need for additional drive equipment, simplifying the structure and reducing energy consumption. Compared with the existing single transmission path pump head, it achieves precise power distribution of "one source, two drives".

[0047] The sun gear assembly includes a fixed sun gear 31, a movable sun gear 32, and a movable sun gear push tube 33 for driving the movable sun gear 32; the planet gear assembly includes a fixed planet gear 41, a movable planet gear 42, and a movable planet gear push tube 43 for driving the movable planet gear 42. The linkage design of the movable gear and the push tube realizes the adjustability of the transmission structure and breaks the limitation of the existing fixed transmission ratio.

[0048] The outer surfaces of the fixed sun gear 31 and the movable sun gear 32, as well as the fixed planetary gear 41 and the movable planetary gear 42, are all designed as conical inclined surfaces. The transmission belt 5 is attached to the conical inclined surface and adjusts the transmission ratio according to the position of the movable wheel. The conical inclined surface structure makes the transmission ratio adjustment continuous and linear, which can achieve more precise speed control compared with the existing stepped speed regulation. The contact design between the transmission belt and the inclined surface ensures that the power transmission is slip-free and the transmission efficiency is stable. At the same time, the stepless switching of the transmission ratio is achieved through the dynamic change of the contact radius, which can adapt to the pressure regulation requirements in different scenarios and solve the defects of low speed regulation accuracy and unstable transmission of existing pump heads.

[0049] The outer surface of the inner shell 1 is provided with a first rolling rod 11, and the outer surface of the inner shell 2 is provided with a second rolling rod 21. There are four first rolling rods 11 on the outer surface of the inner shell 1 and four second rolling rods 21 on the outer surface of the inner shell 2, which are distributed at equal angles along the circumference of the inner shell. The taper of the conical inclined surface of the fixed sun gear 31 and the movable sun gear 32 is 1:5. The fluid channel includes an injection pipe 7 and a suction pipe 71. The injection pipe 7 is set to correspond to the second rolling rod 21, and the suction pipe 71 is set to correspond to the first rolling rod 11. Compared with the existing hub rolling type, the rolling rod extrusion pressure output has a more uniform contact area, which can significantly reduce pressure fluctuation and improve output stability. The one-to-one correspondence design between the channel and the rolling rod allows the speed change of the double inner shell to be directly converted into the pressure change of the corresponding channel, realizing independent pressure control of injection and negative pressure suction, and solving the problem of large pressure fluctuation and inability to independently control pressure in the dual channels of the existing pump head.

[0050] The sun gear assembly and the planetary gear assembly are connected by an anti-sway bearing 61 and a connecting rod 6. The anti-sway bearing 61 is fitted on the outside of the sun gear rod 3 and the planetary gear rod 4. The anti-sway bearing 61 can effectively limit the radial sway of the gear rods and prevent the gears from shifting during transmission. The connecting rod 6 fixes the two sets of assemblies as a whole, ensuring that the relative position of the sun gear and the planetary gears is stable during transmission. This ensures that the transmission belt 5 always fits against the inclined plane, preventing transmission slippage or detachment, improving the stability and reliability of the equipment operation, and solving the defects of existing transmission assemblies that are prone to swaying and have low transmission accuracy.

[0051] The speed adjustment of the dual inner shell assembly is stepless or multi-stage, taking into account the adjustment needs of different scenarios. Stepless adjustment can realize continuous fine adjustment of pressure, which is suitable for scenarios with high precision requirements such as medical infusion. Multi-stage adjustment can preset fixed speed levels to meet the needs of standardized operation and make operation more convenient. Compared with the existing single speed adjustment method, it has a wider range of applications. At the same time, in conjunction with the transmission structure mentioned above, it can achieve both accuracy and efficiency in pressure adjustment.

[0052] The present invention also provides a method for using an adjustable speed injection pump, comprising the following steps:

[0053] Step 1: Power input and basic transmission start-up:

[0054] The drive device outputs power to the sun gear rod 3, which drives the inner shell 1 to rotate synchronously. The sun gear rod 3 drives the fixed sun gear 31 and the movable sun gear 32 to rotate. The power is transmitted to the fixed planetary gear 41 and the movable planetary gear 42 through the transmission belt 5, so that the planetary gear assembly rotates synchronously with the sun gear assembly.

[0055] Step 2: Transmission ratio adjustment and dual-inner-shell speed control:

[0056] The external driving mechanism drives the movable sun gear push tube 33 and the movable planet gear push tube 43, which in turn drives the movable sun gear 32 to move along the axis of the sun gear rod 3 and the movable planet gear 42 to move along the axis of the planet gear rod 4.

[0057] Since the fixed sun gear 31 / movable sun gear 32 and the fixed planet gear 41 / movable planet gear 42 are conical inclined surface structures, the transmission belt 5 slides on the inclined surface as the position of the movable wheel changes, changing the contact radius ratio between the sun gear assembly and the planet gear assembly, thereby adjusting the transmission ratio:

[0058] When the moving wheel approaches the fixed wheel, the contact radius ratio is 1:1, the transmission ratio is 1, and the inner shell 1 and the inner shell 2 rotate at the same speed.

[0059] When the moving wheel moves away from the fixed wheel, the contact radius ratio deviates from 1, the transmission ratio changes, and the inner shell 1 and the inner shell 2 rotate at different speeds.

[0060] During this process, the anti-sway bearing 61 and the connecting rod 6 limit the radial sway of the sun gear assembly and planet gear assembly, ensuring that the transmission belt 5 fits against the inclined surface of the wheel body;

[0061] Step 3: Pressure output and multi-channel independent adjustment:

[0062] Inner shell 1 squeezes suction tube 71 through first rolling rod 11, and inner shell 2 squeezes injection tube 7 through second rolling rod 21. Combined with the difference in rotation speed between the two inner shells, the negative pressure of suction tube 71 and the injection pressure of injection tube 7 can be independently adjusted.

[0063] In summary, this adjustable speed injection pump, through the coordinated design of its various structures, achieves a comprehensive improvement in functionality, stability, accuracy, and practicality compared to existing technologies. Its core benefits can be summarized into four dimensions, with each dimension complementing and supporting the others, ensuring that the equipment is adaptable to fluid delivery needs in various scenarios.

[0064] Firstly, the functionality has been expanded and upgraded, breaking through the limitations of a single function. Relying on the corresponding design of the double inner shell assembly (inner shell 1, inner shell 2) and the dual fluid channels (injection pipe 7, suction pipe 71), combined with the "one source, dual drive" transmission logic, the defects of the existing pump head's single-channel or unidirectional dual-channel output are completely solved, realizing independent adjustment of injection pressure and negative pressure suction pressure. Multi-task fluid transportation can be completed without the need for additional equipment, greatly improving the applicability of the equipment.

[0065] Secondly, the transmission is stable and efficient, reducing operating losses. The transmission component adopts a composite structure of "sun gear-planet gear-conduction belt 5", combined with the anti-sway bearing 61 and the fixed limiting design of the connecting rod 6. This not only avoids radial swaying of the wheel body and slippage of the conduction belt, but also achieves low-friction relative rotation of the two inner shells through the connecting bearing 9, reducing mechanical wear and power loss. The power transmission path is clear and the efficiency is stable, solving the problems of unstable transmission and high energy consumption in existing pump heads.

[0066] Thirdly, it offers precise and flexible adjustment to meet diverse needs. Through the linkage structure of the moving wheels, the sun gear 32, the planetary gears 42, and the push tube, combined with the fitting design of the conical inclined surface and the conduction belt, linear adjustment of the transmission ratio is achieved. It allows for flexible switching between stepless fine-tuning and multi-level adjustment modes. The dual inner shell provides precise speed control, thus ensuring continuous and controllable pressure. Compared to existing stepped speed regulation, it offers higher precision and faster response, meeting the high pressure control accuracy requirements of scenarios such as medical infusion.

[0067] Fourth, the optimized structural integration enhances practical value. Adopting an integrated layout of "internal transmission + external channel," the built-in transmission components reduce the device's size, and the rolling rod-type pressure output ensures more uniform contact, significantly reducing pressure fluctuations and improving output stability. Simultaneously, the elimination of multiple power sources simplifies the structure and operation process, reducing failure rates and operating costs. This balances reliability, convenience, and economy, making it widely applicable to fluid transport scenarios in medical, chemical, and other fields.

[0068] It should be noted that the drive device and external actuation mechanism are existing technologies and will not be described in detail here.

[0069] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An adjustable speed injection pump, characterized in that: Includes a housing (8), inside which are a double inner shell assembly, a transmission assembly and at least two fluid channels that can rotate relative to each other; the transmission assembly is located inside the double inner shell assembly and drives the double inner shell assembly to achieve rotation at the same speed or differential speed, and the fluid channels are correspondingly located on the outside of the double inner shell assembly, and the pressure of each fluid channel can be independently adjusted by adjusting the rotation speed of the double inner shell assembly. The double inner shell assembly includes an inner shell one (1) and an inner shell two (2), and the inner shell one (1) and the inner shell two (2) are rotatably connected by a connecting bearing (9); The transmission assembly includes a sun gear assembly, a planetary gear assembly, and a transmission belt (5). The sun gear assembly is driven to the inner shell one (1), and the planetary gear assembly is driven to the inner shell two (2). The sun gear assembly includes a fixed sun gear (31), a movable movable sun gear (32), and a movable sun gear push tube (33) that drives the movable sun gear (32). The planetary gear assembly includes a fixed planetary gear (41), a movable movable planetary gear (42), and a movable planetary gear push tube (43) that drives the movable planetary gear (42). The outer surfaces of the fixed sun gear (31), the movable sun gear (32), the fixed planetary gear (41), and the movable planetary gear (42) are all conical inclined surfaces. The transmission belt (5) fits the conical inclined surface and adjusts the transmission ratio as the position of the movable wheel changes. The sun gear assembly and the planet gear assembly are connected by a connecting rod (6) and an anti-sway bearing (61), with the anti-sway bearing (61) fitted onto the outside of the sun gear rod (3) and the planet gear rod (4); The outer side of the first inner shell (1) is provided with a first rolling rod (11) and a corresponding suction tube (71), and the outer side of the second inner shell (2) is provided with a second rolling rod (21) and a corresponding injection tube (7).

2. The adjustable speed injection pump according to claim 1, characterized in that: The rotational speed of the dual inner shell assembly can be adjusted steplessly or in multiple stages.

3. A method of using the adjustable speed injection pump as described in claim 1 or 2, characterized in that, Includes the following steps: Step 1: Power input and basic transmission start-up: The drive equipment outputs power to the sun gear rod (3), the sun gear rod (3) drives the inner shell (1) to rotate synchronously, the sun gear rod (3) drives the fixed sun gear (31) and the movable sun gear (32) to rotate, and the power is transmitted to the fixed planetary gear (41) and the movable planetary gear (42) through the transmission belt (5), so that the planetary gear assembly rotates synchronously with the sun gear assembly; Step 2: Transmission ratio adjustment and double inner shell speed control: The external push mechanism drives the moving sun gear push tube (33) and the moving planet gear push tube (43), which in turn drive the moving sun gear (32) to move axially along the sun gear rod (3) and the moving planet gear (42) to move axially along the planet gear rod (4); the transmission ratio is adjusted by changing the contact radius ratio of the sun gear assembly and the planet gear assembly by relying on the conical inclined surface structure; when the moving wheel is close to the fixed wheel, the transmission ratio is 1, and the inner shell one (1) and the inner shell two (2) rotate at the same speed; when the moving wheel is far away from the fixed wheel, the transmission ratio changes, and the inner shell one (1) and the inner shell two (2) rotate at different speeds; the anti-sway bearing (61) and the connecting rod (6) limit the radial sway of the sun gear assembly and the planet gear assembly; Step 3: Pressure output and independent adjustment of multiple channels: Inner shell one (1) squeezes suction tube (71) through first rolling rod (11), and inner shell two (2) squeezes injection tube (7) through second rolling rod (21). Combined with the difference in rotation speed of the two inner shells, the negative pressure of suction tube (71) and the injection pressure of injection tube (7) can be adjusted independently.

4. The method of using the adjustable speed injection pump according to claim 3, characterized in that: In step 2, the position of the moving sun gear (32) and the moving planet gear (42) is adjusted by the corresponding push tubes, and the transmission ratio is changed by the sliding of the transmission belt (5) on the conical inclined surface.

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