High stability double-stage peristaltic pump

Abstract

The utility model discloses a high stability double -step peristaltic pump, including base, shell and upper cover, three form upside down set's first pump cavity and second pump cavity, and the pump cavity bottom is equipped with sun gear. Motor drives first pump cavity rotor subassembly through first drive gear, and drives second pump cavity rotor subassembly through second drive gear. Rotor subassembly is by the upper plate, the lower plate and the vertical board constitutes the roller carrier, and the planetary gear is engaged with sun gear and drives the roller extrusion hose and transports fluid. The upper plate and lower plate are equipped with annular protrusion, cooperate with the boss of pump cavity to reduce the radial deviation because of extrusion. The recess and the limiting post are equipped in the upper cover, cooperate with the upper plate aperture to stabilize second pump cavity rotor subassembly rotation. The shell is with upper cover, shell and base between adoption inlaying clamping and enhance the connection reliability, and set up the guide structure, the limit piece and the anti -escape boss to improve the operation stability and security. Planetary gear adopts non - integer tooth number ratio and reduces the vibration, makes the whole machine have high stability and long life.

Description

Technical Field

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

[0002] Peristaltic pumps are a type of pump that uses rollers to periodically squeeze a tubing to transfer fluids. They offer advantages such as the medium not contacting the pump body, simple maintenance, and applicability to various sensitive fluids, making them widely used in biological experiments, medical equipment, precision instruments, and chemical liquid transportation. Traditional two-stage or multi-stage peristaltic pumps typically employ a cascaded gear transmission structure, where planetary gears and a sun gear mesh to drive the roller frame, thus achieving continuous tubing compression. However, due to their complex internal structure, numerous components, and multiple layers of meshing, ensuring operational stability and manufacturing consistency remains a significant technical challenge in the industry.

[0003] In the existing structure, the rollers generate a significant reaction force when applying pressure to the hose, making the roller frame prone to radial displacement during rotation. If the meshing position of the planetary gears and the sun gear is affected by this displacement, it will lead to unstable meshing clearance, resulting in increased vibration, increased noise, and even uneven hose compression. Furthermore, if the top cover or middle cover does not provide sufficient support for the roller frame, the roller frame is more likely to wobble at high speeds, affecting the overall operational stability of the machine.

[0004] On the other hand, traditional planetary gears and rollers often employ a split structure, assembled from independent shafts and multiple small components. This type of structure not only suffers from insufficient manufacturing consistency, making it prone to assembly deviations, but also has limited overall strength, making it susceptible to deformation under prolonged operation or high loads, further reducing the stability of the overall transmission path. Simultaneously, the lack of an effective isolation structure near the rollers and gears poses a risk of the hose being caught in the gear meshing area during high-frequency compression, affecting transport safety. Summary of the Invention

[0005] 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.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a highly stable two-stage peristaltic pump, comprising: The base, housing, and top cover together constitute two independent pump chambers, a first pump chamber and a second pump chamber, located at the bottom and at the top. 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 first pump chamber. The rotor assembly includes a rotor assembly in both the first and second pump chambers. The rotor assembly includes a roller frame, which includes an upper plate and a lower plate. The upper plate and the lower plate are fixedly connected by a vertical plate, and at least three planetary gears are rotatably connected between the upper plate and the lower plate. A roller for squeezing the hose is fixedly connected above the planetary gears. The planetary gear in the first pump chamber meshes with the first drive gear, and at the same time, the planetary gear meshes with the sun gear in the first pump chamber. The first drive gear drives the rotor assembly located in the first pump chamber to rotate. A second drive gear is fixedly connected above the upper plate of the rotor assembly located in the first pump chamber. The second drive gear is used to drive the planetary gear in the rotor assembly in the second pump chamber. The bottom of the lower plate and the top of the upper plate are provided with annular protrusions to convert the surface contact friction of the roller frame into linear friction; the planes of the first pump chamber and the second pump chamber are provided with bosses, and the annular protrusions and the bosses together are used to reduce the radial displacement caused by the reaction force of the roller squeezing the hose.

[0007] In a further embodiment, the upper cover has a recessed cavity that adapts to the shape of the upper plate, and a limiting post extends downward from the center of the cavity. The upper plate has an opening in the middle that adapts to the limiting post. The cavity, the limiting post, and the opening together are used to maintain the rotational stability of the roller frame in the second pump chamber.

[0008] In a further embodiment, a convex surface is provided below the top cover and below the housing, and a concave surface is provided above the housing and above the base. The top cover and the housing are connected by an embedded snap-fit ​​connection through the convex surface and the concave surface, and the convex surface of the housing and the concave surface of the base are connected by an embedded snap-fit ​​connection.

[0009] In a further embodiment, a guide post is provided on the convex surface, and the upper plate in the second pump chamber is provided with a guide hole adapted to the guide post, for further stabilizing the rotation of the rotor assembly in the second pump chamber.

[0010] In a further embodiment, a limiting piece is also included, wherein there are two limiting pieces, which are respectively fixedly disposed on the base and the housing, and the limiting piece is disposed between the hose and the planetary gear.

[0011] In a further embodiment, the vertical plate in the second pump chamber is composed of three independent plates that evenly separate the planetary gear and the roller; the vertical plate in the second pump chamber is composed of three plates, the upper parts of which are connected to each other, and a protrusion is fixedly provided at the junction of the plates to prevent the sun gear from escaping.

[0012] In a further embodiment, the base is fixed to the motor by screws.

[0013] In a further embodiment, the lower end of the base is recessed to form a second concave cavity that adapts to the shape of the upper end face of the motor, and the base is snapped into the motor.

[0014] 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.

[0015] 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.

[0016] Compared with the prior art, this utility model has the following beneficial effects: By setting annular protrusions on the upper and lower plates respectively and cooperating with the corresponding protrusions in the first and second pump chambers, the reaction force generated by the traditional roller squeezing the hose no longer causes the radial displacement of the roller frame as a whole, thereby improving the operating stability of the rotor assembly; the concave cavity of the upper cover, the limiting post, and the opening of the upper plate form a double limiting structure in the vertical direction, which can effectively suppress the shaking of the roller frame in the second pump chamber during high-speed operation and improve the gear meshing accuracy; the shell, the upper cover, and the base adopt an embedded snap-fit ​​structure with convex and concave surfaces, making the overall assembly more solid and reducing the deformation accumulation caused by screw connections; the guide post and the guide hole further improve the concentricity of rotation; the two limiting pieces effectively block the contact between the hose and the planetary gear, preventing the hose from getting caught in the gear area; the connection structure of the three vertical plates and the protrusion for preventing the sun gear from escaping enhance the overall strength and meshing reliability of the transmission mechanism; the planetary gear design with a non-integer tooth ratio avoids the vibration generated by periodic meshing. This invention significantly improves the overall operational stability, meshing reliability, and service life of the two-stage peristaltic pump, surpassing existing technologies.

[0017] 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

[0018] Figure 1 This is a perspective view of an embodiment of the present utility model; Figure 2This 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 1 ; Figure 6 This is a schematic diagram of the rotor assembly structure according to an embodiment of the present utility model. Figure 2 ; Figure 7 This is a schematic diagram of the overall structure of the upper cover according to an embodiment of the present utility model; Figure 8 This is a schematic diagram of the overall structure of the shell according to an embodiment of the present utility model; Figure 9 This is a schematic diagram of the housing base structure of an embodiment of the present utility model.

[0019] Explanation of the labels in the diagram: 1. Base; 11. Second cavity; 2. Shell; 3. Top cover; 31. Cavity; 32. Limiting post; 41. First pump chamber; 42. Second pump chamber; 5. Sun gear; 6. Motor; 61. First drive gear; 62. Second drive gear; 64. Screw; 7. Rotor assembly; 71. Roller frame; 72. Planetary gear; 73. Roller; 74. Opening; 75. Protrusion; 711. Upper board; 712. Lower board; 713. Vertical board; 8. Annular protrusion; 9. Boss; 10. Limiting plate; 101. Convex surface; 102. Concave surface; 103. Guide post; 104. Guide hole; 12. Connector. Detailed Implementation

[0020] 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.

[0021] like Figures 1 to 4As shown, the high-stability two-stage peristaltic pump of this embodiment mainly consists of a base 1, a housing 2, and a top cover 3 forming an overall pump frame. The three components, when combined, form a first pump chamber 41 and a second pump chamber 42 that are independent of each other at the bottom and top. To ensure overall structural stability, the components are connected using an embedded snap-fit ​​method. Specifically, the housing 2 and the top cover 3, and the housing 2 and the base 1, respectively employ a snap-fit ​​structure with a convex surface 101 and a concave surface 102. This ensures that the assembled housing has high coaxiality and overall strength, and reduces the impact of cumulative deformation caused by the screw 64 connection on the gear meshing accuracy.

[0022] like Figure 2 and Figure 3 As shown, mounting spaces for supporting the transmission system, namely the first pump chamber 41 and the second pump chamber 42, are formed inside the base 1, housing 2, and top cover 3. The bottom of the inner sidewalls of both the first pump chamber 41 and the second pump chamber 42 are integrally formed with a sun gear 5 for meshing with the planetary gear 72. The lower end of the base 1 has a second recess 31 that is concave inwards. The shape of the recess 31 matches the top shape of the motor 6, allowing the base 1 to be directly snapped onto the top of the motor 6, forming an "I-beam" structure that improves the stability of the connection between the pump body and the motor 6. Simultaneously, the base 1 is further fixed to the motor 6 by screws 64, ensuring that the power input position of the entire machine will not loosen or shift due to prolonged operation.

[0023] like Figures 4 to 6 As shown, rotor assemblies 7 are respectively installed in the first pump chamber 41 and the second pump chamber 42. Each rotor assembly 7 includes a roller frame 71 composed of an upper plate 711, a lower plate 712, and a vertical plate 713. The vertical plate 713 is used to connect the upper and lower plates 712 and divide the internal space. The vertical plate 713 in the second pump chamber 42 is composed of three independent plates. The three plates are connected to each other at the top. A protruding protrusion 75 is provided at the junction. The protrusion 75 is located above the sun gear 5 and is used to prevent the sun gear 5 from axially escaping during operation, thereby maintaining stable meshing between gears.

[0024] like Figure 5 and Figure 6 As shown, at least three planetary gears 72 are rotatably connected between the upper plate 711 and the lower plate 712. A roller 73 for squeezing the hose is fixedly connected above each planetary gear 72. The revolution of the planetary gears 72 drives the rollers 73 to perform continuous squeezing action, thereby realizing fluid transport within the pump chamber. Limiting plates 10 are respectively provided between the rollers 73 and the planetary gears 72. The limiting plates 10 are fixed inside the base 1 or the housing 2 to prevent the hose from deforming and getting caught in the gear area when squeezed by the rollers 73, thus improving transport safety.

[0025] like Figure 2 , Figure 5 , Figure 6 and Figure 7 As shown, to reduce the reaction force on the roller frame 71 and the resulting radial offset when the roller 73 squeezes the hose, this embodiment forms annular protrusions 8 at the bottom of the lower plate 712 and the top of the upper plate 711. These annular protrusions 8 cooperate with the bosses 9 on the bottom or top of the first pump chamber 41 and the second pump chamber 42, enabling the roller frame 71 to operate in a "linear support" manner during high-speed rotation. This reduces the large friction area generated by traditional planar support and improves rotational stability. Simultaneously, this structure ensures that the roller frame 71 remains within a limited range of motion when subjected to the reaction force of the hose, preventing swaying from affecting gear meshing or conveying accuracy.

[0026] like Figure 2 and Figure 7 As shown, to maintain the rotational posture of the rotor assembly 7 inside the second pump chamber 42, a recess 31 matching the shape of the upper plate 711 is formed inside the upper cover 3. A limiting post 32 is provided in the middle of the recess 31, which is inserted into the opening 74 in the middle of the upper plate 711, so that the upper plate 711 is subject to double limiting in the vertical direction during its rotation. This structure effectively suppresses the vibration of the roller frame 71 in the second pump chamber 42 caused by high-speed revolution, improves the stability of the meshing of the second drive gear 62, and effectively improves the continuity and accuracy of fluid delivery. In addition, guide posts 103 are also provided on some of the convex surfaces 101, which cooperate with the corresponding guide holes 104 of the upper plate 711 to further improve the rotational concentricity of the roller frame 71 in the upper pump chamber and reduce eccentric wear during gear meshing.

[0027] In the first pump chamber 41, the first drive gear 61 at the output end of the motor 6 is fixed at the center of the pump chamber, meshes with multiple planetary gears 72, and drives them to revolve, so that the rotor assembly 7 of the first pump chamber 41 drives the roller 73 to squeeze the hose to achieve low-order delivery. A second drive gear 62 is arranged above the upper plate 711 of the rotor assembly 7 in the first pump chamber 41. The second drive gear 62 rotates synchronously with the roller frame 71 in the first pump chamber 41 and meshes with the planetary gears 72 in the second pump chamber 42, thereby achieving synchronous drive of the second pump chamber 42 without the need for an independent motor 6. To improve meshing noise, this embodiment adopts a non-integer tooth ratio structure, and the tooth ratios between adjacent planetary gears 72 are all different, which can avoid periodic meshing impacts between gears and significantly reduce vibration and noise.

[0028] For example, 1. Figure 8 and Figure 9 As shown, hose connectors 12 are snapped together between the base 1 and the housing 2, and between the housing 2 and the top cover 3, so that the hose can be stably arranged between the upper plate 711 and the roller 73 of the pump chamber, and is not easy to dislodge due to operating vibration, thus improving the reliability of fluid delivery.

[0029] In summary, this embodiment, through the design of multiple support and limiting mechanisms, the matching structure of the annular protrusion 8 and the boss 9, the gear set with a non-integer tooth ratio, the integrated roller frame 71, and the three-plate vertical plate 713, enables the two-stage peristaltic pump to have higher meshing stability, anti-deviation ability, low vibration characteristics, and longer service life during high-speed operation. Its overall performance is significantly better than that of the prior art.

[0030] 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. A highly stable 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, located at the bottom and at the top. 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 first pump chamber. The rotor assembly includes a rotor assembly in both the first and second pump chambers. The rotor assembly includes a roller frame, which includes an upper plate and a lower plate. The upper plate and the lower plate are fixedly connected by a vertical plate, and at least three planetary gears are rotatably connected between the upper plate and the lower plate. A roller for squeezing the hose is fixedly connected above the planetary gears. The planetary gear in the first pump chamber meshes with the first drive gear, and at the same time, the planetary gear meshes with the sun gear in the first pump chamber. The first drive gear drives the rotor assembly located in the first pump chamber to rotate. A second drive gear is fixedly connected above the upper plate of the rotor assembly located in the first pump chamber. The second drive gear is used to drive the planetary gear in the rotor assembly in the second pump chamber. The bottom of the lower plate and the top of the upper plate are provided with annular protrusions to convert the surface contact friction of the roller frame into linear friction; the planes of the first pump chamber and the second pump chamber are provided with bosses, and the annular protrusions and the bosses together are used to reduce the radial displacement caused by the reaction force of the roller squeezing the hose.

2. The high-stability two-stage peristaltic pump according to claim 1, characterized in that: The upper cover has a recessed cavity that fits the shape of the upper plate. A limiting post extends downward from the center of the cavity. An opening that fits the limiting post is provided in the middle of the upper plate. The cavity, the limiting post, and the opening together are used to maintain the rotational stability of the roller frame in the second pump chamber.

3. The high-stability two-stage peristaltic pump according to claim 1, characterized in that: The top cover and the housing have convex surfaces below them, and the housing and the base have concave surfaces above them. The top cover and the housing are connected by an embedded snap-fit ​​through the convex and concave surfaces, and the convex surface of the housing and the concave surface of the base are connected by an embedded snap-fit.

4. A high-stability two-stage peristaltic pump according to claim 3, characterized in that: A guide post is provided on the convex surface, and a guide hole adapted to the guide post is provided on the upper plate in the second pump chamber to further stabilize the rotation of the rotor assembly in the second pump chamber.

5. A high-stability two-stage peristaltic pump according to claim 1, characterized in that: It also includes two limiting plates, which are fixedly disposed on the base and the housing, respectively, and are disposed between the hose and the planetary gear.

6. A high-stability two-stage peristaltic pump according to claim 1, characterized in that: The vertical plate in the second pump chamber consists of three independent plates that evenly separate the planetary gear and the roller; the vertical plate in the second pump chamber consists of three plates, the upper parts of which are connected to each other, and a protrusion is fixedly provided at the junction of the plates to prevent the sun gear from escaping.

7. A high-stability two-stage peristaltic pump according to claim 1, characterized in that: The base is fixed to the motor with screws.

8. A high-stability two-stage peristaltic pump according to claim 7, characterized in that: The lower end of the base is recessed to form a second cavity that matches the shape of the upper surface of the motor, and the base is snapped into the motor.

9. A high-stability 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.

10. A high-stability 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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