Improved double-step peristaltic pump

Abstract

This utility model discloses an improved two-stage peristaltic pump, including a base, a housing, and a top cover, which form a first pump chamber and a second pump chamber distributed vertically. The bottom of the sidewall of each pump chamber forms a sun gear. A motor drives the rotor assembly in the second pump chamber to rotate, and synchronously drives the rotor assembly in the first pump chamber via a second drive gear. The rotor assembly includes a roller frame, planetary gears, and rollers. The planetary gears mesh with their corresponding sun gears to compress the hose and deliver fluid. The end faces of the two pump chambers that contact the planetary gears have annular protrusions, changing the planetary gear contact from surface contact to line contact support, reducing friction and wear. A top plate with a groove is provided above the roller frame, and a limiting protrusion in the middle of the top cover engages with the groove to stabilize the high-speed rotation of the planetary gear set. This structure results in smoother operation, longer lifespan, and lower noise.

Description

Technical Field

[0001] This utility model relates to the field of pumps, and in particular to an improved two-stage peristaltic pump. Background Technology

[0002] Peristaltic pumps deliver fluids by periodically squeezing a tubing with rollers. They offer advantages such as simple structure, easy maintenance, and no contact between the medium and the pump body, making them widely used in medical, analytical instrument, and industrial fluid transport applications. Existing two-stage peristaltic pumps typically use planetary gears revolving around a sun gear to drive the roller frame, achieving continuous squeezing of the tubing. However, some structural problems still exist in practical applications.

[0003] In existing structures, the bottom face of the planetary gears and the inner bottom surface of the base are mostly in surface contact. When the rotor rotates at high speed, a large friction area is generated between the bottom of the planetary gears and the base, which not only increases wear and energy consumption but may also cause localized heating, affecting the overall lifespan and rotational stability of the machine. In addition, peristaltic pumps usually lack an upper limiting structure for the planetary gear set in the upper chamber. Under high-speed conditions, the planetary gear set is prone to wobbling due to inertia and slight eccentricity, making the gear meshing unstable and causing problems such as increased noise, enhanced vibration, or fluctuations in delivery pressure. Summary of the Invention

[0004] In view of this, it is necessary to provide a two-stage peristaltic pump that is stable in operation, has low noise, and low friction loss.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: an improved two-stage peristaltic pump, characterized in that it comprises: The base, housing, and top cover together constitute two independent pump chambers, a first pump chamber and a second pump chamber, and the bottom of the inner peripheral sidewalls of the first pump chamber and the second pump chamber form a sun gear. The motor is fixedly connected to the bottom of the base, and the output end of the motor is connected to a first drive gear, which is located in the middle of the pump chamber at the lower end. The rotor assembly is provided in both the first pump chamber and the second pump chamber. The rotor assembly includes a roller frame, at least three planetary gears are rotatably connected to the bottom of the roller frame, and multiple rollers for squeezing the hose are rotatably connected to the upper peripheral sidewall of the roller frame. The planetary gear in the second pump chamber located at the lower end meshes with the first drive gear, and at the same time the planetary gear meshes with the sun gear in the second pump chamber. The first drive gear drives the rotor located in the second pump chamber to rotate. The top of the roller frame in the second pump chamber is connected to a second drive gear, which is located in the middle of the first pump chamber; The planetary gear in the first pump chamber meshes with the second drive gear; An annular protrusion is provided on the end face of the first pump chamber and the second pump chamber that contacts the planetary gear.

[0006] In a further embodiment, a top plate is snapped onto the upper part of the roller frame, a limiting groove is recessed in the middle of the top plate, and a limiting protrusion adapted to the shape of the limiting groove is protruded in the middle of the interior of the upper cover. The limiting protrusion is used to stabilize the wobbling and swaying of the planetary gear.

[0007] In a further embodiment, the roller frame has an annular sealing plate in the middle, the hose is located at the upper end of the sealing plate, and the planetary gear is located at the lower end of the sealing plate.

[0008] In a further embodiment, the number of rollers and planetary gears are equal within the same rotor assembly.

[0009] In a further embodiment, multiple rotating shafts are fixedly connected to the roller frame, and each rotating shaft is equipped with a roller and a planetary gear.

[0010] In a further embodiment, the tooth ratio between the planetary gear and the sun gear corresponding to the first pump chamber and the second pump chamber is a non-integer tooth ratio, and the tooth ratio between each planetary gear and the sun gear is different.

[0011] In a further embodiment, the sealing plate and the roller frame are integrally formed.

[0012] In a further embodiment, the annular protrusion also includes an inner top portion disposed on the upper cover.

[0013] In a further embodiment, a connector for hose operation is snapped between the base and the housing, and a connector for hose operation is snapped between the housing and the top cover.

[0014] Compared with the prior art, this utility model has the following advantages: By setting an annular protrusion on the contact end face of the first and second pump chambers and the planetary gears, the bottom of the planetary gears changes from the original surface contact friction to line contact support, which significantly reduces rotational resistance and wear while ensuring meshing stability, thereby reducing energy consumption and extending the service life of the whole machine; by setting a top plate above the roller frame and forming a limiting groove in the middle of the top plate, and setting a limiting protrusion matching the limiting groove inside the upper cover, the planetary gear set is limited by the upper and lower bidirectional structure when running at high speed, which effectively suppresses swaying and improves meshing accuracy and rotational stability; at the same time, the integrated sealing plate structure of the roller frame, the corresponding arrangement of the number of rollers and planetary gears, and the combination of planetary gears with different tooth ratios further optimize the force and meshing characteristics of the rotor, making the overall two-stage peristaltic pump superior to the prior art in terms of noise control, running stability, delivery continuity and service life.

[0015] To make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a perspective view of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the internal structure of an embodiment of the present utility model; Figure 3 Explosion of this utility model embodiment Figure 1 ; Figure 4 Explosion of this utility model embodiment Figure 2 ; Figure 5 This is a schematic diagram of the rotor assembly structure according to an embodiment of the present utility model; Figure 6 This is a schematic diagram of the upper cover structure of an embodiment of the present utility model.

[0017] Explanation of the labels in the diagram: 1. Base; 2. Housing; 3. Top cover; 31. Limiting protrusion; 41. First pump chamber; 42. Second pump chamber; 5. Sun gear; 6. Motor; 61. First drive gear; 62. Second drive gear; 7. Rotor assembly; 71. Roller frame; 72. Planetary gear; 73. Roller; 74. Top plate; 75. Limiting groove; 76. Sealing plate; 77. Rotating shaft; 8. Annular protrusion; 9. Connector. Detailed Implementation

[0018] To further illustrate the technical means and effects of this utility model in achieving its intended purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0019] like Figure 1 and Figure 2 As shown, an improved two-stage peristaltic pump of this embodiment includes three parts: a base 1, a housing 2, and a top cover 3. These three parts are sequentially fitted together to form a first pump chamber 41 and a second pump chamber 42 arranged vertically. To ensure the compactness of the pump structure, sun gears 5 are machined into the bottom side walls of both pump chambers to mesh with planetary gears 72 to form the revolution track of the rotor. A motor 6 is fixedly installed at the bottom of the base 1. The output end of the motor 6 is connected to a first drive gear 61, which is located at the center of the second pump chamber 42 and serves as the driving element for the lower rotor assembly 7.

[0020] like Figure 3 and Figure 5 As shown, the first pump chamber 41 and the second pump chamber 42 are each equipped with an independent rotor assembly 7. Each rotor assembly 7 includes a roller frame 71, several planetary gears 72, and rollers 73 distributed around the periphery of the roller frame 71. The planetary gears 72 are respectively mounted on the lower part of the roller frame 71, so that the planetary gears 72 can rotate around themselves and revolve around the sun gear 5, thereby driving the roller frame 71 to rotate as a whole. Multiple rollers 73 are fixed on the upper part of the roller frame 71. During rotation, the rollers 73 periodically squeeze along the outer wall of the hose to achieve fluid delivery.

[0021] like Figure 2 and Figure 4 As shown, in this embodiment, the planetary gear 72 of the second pump chamber 42 meshes not only with the sun gear 5 but also with the first drive gear 61, thereby achieving active drive of the lower rotor. To achieve synchronous transmission between the two pump chambers, a second drive gear 62 is provided on the top of the roller 73 frame of the second pump chamber 42. The second drive gear 62 extends into the first pump chamber 41 and meshes with the planetary gear 72 of the first pump chamber 41, thereby driving the rotor assembly 7 in the first pump chamber 41 to operate synchronously, realizing dual-channel fluid transmission.

[0022] A connector 9 for hose operation is snapped between the base 1 and the housing 2 and between the housing 2 and the top cover 3. The pre-installed connector 9 facilitates quick connection during use.

[0023] like Figure 2 and Figure 3As shown, to address the problem of large contact friction area and severe wear between the planetary gear 72 and the base 1 in the existing structure, this embodiment provides annular protrusions 8 on the inner bottom surfaces of both the first pump chamber 41 and the second pump chamber 42. These annular protrusions 8 form a ring-shaped line contact support structure, changing the bottom support of the planetary gear 72 from surface contact to line contact support. This structure makes the support points of the gear more concentrated, significantly reducing the friction area, lowering the energy loss during the revolution of the planetary gear 72, and reducing heat generation caused by friction. This makes the overall operation more stable and helps extend the service life of the planetary gear 72 and the pump chamber structure.

[0024] like Figure 5 and Figure 6 As shown, to further stabilize the posture of the rotor assembly 7 during high-speed operation, this embodiment provides a top plate 74 above the roller frame 71, and the top plate 74 is installed on the roller frame 71 by a snap-fit ​​method. A limiting groove 75 is provided in the middle of the top plate 74, while a limiting protrusion 31 protrudes from the center of the inner part of the upper cover 3. The limiting protrusion 31 is inserted into the limiting groove 75, forming an upper radial limiting structure. When the rotor assembly 7 operates at high speed, this structure can counteract the swaying tendency caused by shaking or eccentricity, keeping the shaft 77 and gear meshing in a stable position, helping to reduce vibration and noise, and improving the smoothness of the peristaltic pump operation.

[0025] In addition, an annular sealing plate 76 is provided in the middle of the roller frame 71. The sealing plate 76 is located between the hose and the planetary gear 72, which can effectively isolate the hose from the gear mechanism and prevent the hose from contacting the gear due to uneven force during high-frequency extrusion, thus preventing wear. The sealing plate 76 and the roller frame 71 can be made in one piece, which not only improves the structural strength, but also improves the assembly stability and manufacturing consistency.

[0026] like Figure 5 As shown, in this embodiment, the number of planetary gears 72 and rollers 73 is the same within the same rotor assembly 7, and the planetary gears 72 are all mounted on evenly distributed rotating shafts 77 to achieve uniform compression of the hose and improve conveying stability. Meanwhile, to avoid periodic noise and vibration during the meshing of the planetary gears 72, this embodiment uses a non-integer tooth ratio design between the planetary gears 72 and the sun gear 5 corresponding to the first pump chamber 41 and the second pump chamber 42, and the tooth ratio of each planetary gear 72 is different, making the gear meshing more uniform and reducing the regular impact of mechanical meshing.

[0027] While maintaining the original functions of the two-stage peristaltic pump, this utility model, through the addition of annular protrusions 8, a limiting structure, and an integrated roller frame 71, enables the rotor assembly 7 of the dual pump chambers to achieve better stability, wear resistance, and lower noise during high-speed, long-term operation. The device has a simple and reliable structure, is suitable for applications requiring high-stability conveying, and can be widely used in precision instruments, chemical conveying, medical equipment, and other fields.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. An improved two-stage peristaltic pump, characterized in that, include: The base, housing, and top cover together constitute two independent pump chambers, a first pump chamber and a second pump chamber, and the bottom of the inner peripheral sidewalls of the first pump chamber and the second pump chamber constitute a sun gear. The motor is fixedly connected to the bottom of the base, and the output end of the motor is connected to a first drive gear, which is located in the middle of the second pump chamber. The rotor assembly is provided in both the first pump chamber and the second pump chamber. The rotor assembly includes a roller frame, at least three planetary gears are rotatably connected to the bottom of the roller frame, and multiple rollers for squeezing the hose are rotatably connected to the upper peripheral sidewall of the roller frame. The planetary gear in the second pump chamber located at the lower end meshes with the first drive gear, and at the same time, the planetary gear meshes with the sun gear in the second pump chamber. The first drive gear drives the rotor located in the second pump chamber to rotate. The top of the roller frame in the second pump chamber is connected to a second drive gear, which is located in the middle of the first pump chamber; The planetary gear in the first pump chamber meshes with the second drive gear; An annular protrusion is provided on the end face of the first pump chamber and the second pump chamber that contacts the planetary gear.

2. The improved two-stage peristaltic pump according to claim 1, characterized in that: A top plate is snapped onto the upper part of the roller frame. A limiting groove is recessed in the middle of the top plate. A limiting protrusion adapted to the shape of the limiting groove is protruding in the middle of the inside of the upper cover. The limiting protrusion is used to stabilize the planetary gear's wobbling and wobble.

3. An improved two-stage peristaltic pump according to claim 2, characterized in that: The roller frame has an annular sealing plate in the middle, the hose is located at the upper end of the sealing plate, and the planetary gear is located at the lower end of the sealing plate.

4. An improved two-stage peristaltic pump according to claim 1, characterized in that: Within the same rotor assembly, the number of rollers and planetary gears is equal.

5. An improved two-stage peristaltic pump according to claim 4, characterized in that: Multiple rotating shafts are fixedly connected to the roller frame, and each rotating shaft is equipped with a roller and a planetary gear.

6. An improved two-stage peristaltic pump according to claim 1, characterized in that: The tooth ratio between the planetary gear and the sun gear in the first pump chamber and the second pump chamber is a non-integer tooth ratio, and the tooth ratio between each planetary gear and the sun gear is different.

7. An improved two-stage peristaltic pump according to claim 3, characterized in that: The sealing plate is integrally formed with the roller frame.

8. An improved two-stage peristaltic pump according to claim 1, characterized in that: The annular protrusion also includes an inner top portion disposed on the upper cover.

9. An improved two-stage peristaltic pump according to claim 1, characterized in that: A connector for hose operation is snapped between the base and the housing, and a connector for hose operation is snapped between the housing and the top cover.

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