Peristaltic pump

Abstract

The utility model discloses a peristaltic pump, and relates to the technical field of pump equipment. The peristaltic pump comprises an upper shell, a lower shell, a pump pipe, a rotating assembly, a transmission assembly and a driving device. A first accommodating cavity is defined by the upper shell and the lower shell; the rotating assembly comprises a turntable and a rotor, one end of the rotor is connected with the turntable, and the rotor is used for extruding the pump pipe; the transmission assembly comprises a sun gear and a plurality of connecting gears, each connecting gear comprises an upper connecting part and a lower connecting part, the lower connecting parts are meshed with the sun gear, and the lower connecting parts are further in insection connection with the inner side wall of the lower shell; the side, close to the transmission assembly, of the rotary table is sunken to form a second containing cavity, and the upper connecting part is in insection connection with the side wall of the second containing cavity. The driving device is connected with the sun gear to drive the sun gear to rotate; the transmission assembly and the rotating assembly are both arranged in the first containing cavity. The driving device is arranged outside the first containing cavity. According to the technical scheme, the occupied space of internal parts can be reduced, and therefore the service life of the peristaltic pump is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of pump equipment, in particular to a peristaltic pump. Background Art

[0002] A peristaltic pump is a pump body that conveys fluid by squeezing a pump tube. The peristaltic pump mainly includes a pump tube, a rotor and a transmission structure; the driving device controls the squeezing of the pump tube by the rotor by driving the operation of the transmission structure. At present, in the process of improving the performance of the peristaltic pump by increasing the specification of the pump tube, the original space for placing the pump tube is insufficient; after increasing the specification of the pump tube, the problem of limited movement space of the pump tube will occur; as a result, it is difficult to avoid the friction between the pump tube and the internal parts during operation, which causes damage and further reduces the service life of the peristaltic pump. Summary of the Utility Model

[0003] The main object of the utility model is to propose a peristaltic pump, aiming to extend the service life of the peristaltic pump.

[0004] To achieve the above object, the peristaltic pump proposed by the utility model includes an upper housing and a lower housing, a pump tube, a rotating assembly, a transmission assembly, and a driving device; the upper housing and the lower housing enclose to form a first accommodating cavity; the pump tube is used for conveying liquid; the rotating assembly includes a turntable and a rotor, one end of the rotor is connected to the turntable, and the rotor is used for squeezing the pump tube; the transmission assembly includes a sun gear and a plurality of connecting gears, the connecting gear includes an upper connecting portion and a lower connecting portion, the lower connecting portion meshes with the sun gear, and the lower connecting portion is also in tooth connection with the inner side wall tooth pattern of the lower housing; a second accommodating cavity is formed by a depression on one side of the turntable close to the transmission assembly, and the upper connecting portion is in tooth connection with the side wall tooth pattern of the second accommodating cavity; the driving device is connected to the sun gear to drive the sun gear to rotate; the transmission assembly and the rotating assembly are both arranged in the first accommodating cavity; the driving device is arranged outside the first accommodating cavity.

[0005] In an embodiment, the transmission assembly further includes a planet carrier and a first pin arranged on the planet carrier; the planet carrier is located on the side of the connecting gear close to the second accommodating cavity, and a plurality of the connecting gears are rotatably inserted on the pin.

[0006] In an embodiment, the planet carrier further includes a second pin; the second pin is arranged on the side of the planet carrier facing away from the connecting gear and is located at the center of the planet carrier; the second pin is rotatably connected to the bottom wall of the second accommodating cavity.

[0007] In one embodiment, the transmission assembly includes three of the connecting gears, and the planet carrier includes three of the first pins; for two adjacent ones of the first pins, an included angle is formed with the planet carrier as the vertex; the included angles are all equal.

[0008] In one embodiment, the center of the planet carrier and the axis of the sun gear are located on the same straight line.

[0009] In one embodiment, a first internal tooth pattern is annularly provided on the inner side wall of the lower housing, and the first internal tooth pattern meshes with the lower connecting portion.

[0010] In one embodiment, a second internal tooth pattern is annularly provided on the inner side wall of the second accommodating cavity, and the second internal tooth pattern meshes with the upper connecting portion.

[0011] In one embodiment, the transmission ratio between the sun gear and the second internal tooth pattern is 22:1.

[0012] In one embodiment, the number of teeth of the sun gear is 9, the number of teeth of the first internal tooth pattern is 27, and the number of teeth of the second internal tooth pattern is 33.

[0013] In one embodiment, the number of teeth of the connecting gear is 9.

[0014] In one embodiment, the upper connecting portion and the lower connecting portion have the same number of teeth, and the diameter of the upper connecting portion is smaller than the diameter of the lower connecting portion.

[0015] The technical solution of the present utility model sets the peristaltic pump to include an upper housing, a lower housing, a pump tube, a rotating assembly, a transmission assembly, and a driving device; the upper housing and the lower housing enclose to form a first accommodating cavity; the pump tube is used for conveying liquid; the rotating assembly includes a turntable and a rotor, one end of the rotor is connected to the turntable, and the rotor is used for squeezing the pump tube; the transmission assembly includes a sun gear and a plurality of connecting gears, the connecting gear includes an upper connecting portion and a lower connecting portion, the lower connecting portion meshes with the sun gear, and the lower connecting portion is also connected to the tooth pattern on the inner side wall of the lower housing; a second accommodating cavity is recessed on one side of the turntable close to the transmission assembly, and the upper connecting portion is connected to the tooth pattern on the side wall of the second accommodating cavity; the driving device is connected to the sun gear to drive the sun gear to rotate; the transmission assembly and the rotating assembly are both arranged in the first accommodating cavity; the driving device is arranged outside the first accommodating cavity.

[0016] During operation, the driving device drives the sun gear to rotate, and the sun gear drives the lower connecting part of the connecting gear to rotate, so that the upper connecting part also moves accordingly; furthermore, the upper connecting part drives the turntable connected to its tooth pattern, and the rotation of the turntable drives the rotor of the turntable to rotate around the rotation axis of the turntable; thus, a negative pressure chamber is formed in the pump tube under the extrusion of the rotor to transport liquid. It can be understood that in this technical solution, the setting of the transmission assembly and the tooth pattern connection setting between the transmission assembly and the lower housing and the turntable are equivalent to forming a transmission system similar to a two-stage planetary gear train. The difference from the conventional two-stage planetary gear train is that a connecting gear is used instead of a single-layer gear in the conventional two-stage planetary gear train; with this setting, compared with using a single-layer planetary gear for the transmission connection between the sun gear and the turntable, the number of components is reduced, the structure is simplified, which helps to reduce the occupied space of the transmission assembly and can provide more moving space for the pump tube. In addition, since the upper connecting part of the connecting gear is directly connected to the second accommodating cavity of the turntable by tooth pattern and the lower connecting part of the connecting gear is directly connected to the lower housing by tooth pattern, it is equivalent to integrating the components (such as the tooth ring and the tooth collar) used for meshing with the connecting gear on the turntable and the lower housing, or directly setting tooth patterns at the corresponding positions of the turntable and the lower housing for connection; with this setting, the structure is more compact, further reducing the occupied space of the transmission assembly and providing more moving space for the pump tube. Since more moving space is provided for the pump tube, the degree of restriction of the moving space of the pump tube is reduced, the friction is reduced, and thus the service life of the peristaltic pump can be prolonged. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0018] Figure 1 Structural schematic diagram of an embodiment of the peristaltic pump provided by the present invention;

[0019] Figure 2 Structural schematic diagram of another perspective of an embodiment of the peristaltic pump provided by the present invention;

[0020] Figure 3 Structural schematic diagram of the lower housing of an embodiment of the peristaltic pump provided by the present invention;

[0021] Figure 4 Structural schematic diagram of the rotating assembly of an embodiment of the peristaltic pump provided by the present invention;

[0022] Figure 5Schematic structural diagram of a planet carrier in an embodiment of the peristaltic pump provided by the present utility model;

[0023] Figure 6 Schematic structural diagram of the planet carrier from another perspective in an embodiment of the peristaltic pump provided by the present utility model.

[0024] Explanation of the reference numerals in the drawings:

[0025] 1. Upper housing; 2. Lower housing; 21. First internal tooth pattern; 3. First accommodating cavity; 4. Rotating assembly; 41. Turntable; 411. Second accommodating cavity; 412. Second internal tooth pattern; 42. Rotor; 5. Transmission assembly; 51. Sun gear; 52. Connecting gear; 521. Upper connecting part; 522. Lower connecting part; 6. Driving device; 7. Pump nozzle; 8. Planet carrier; 81. First pin; 82. Second pin.

[0026] The realization of the purpose, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0028] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0029] In addition, if the embodiments of the present utility model involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0030] The present utility model provides a peristaltic pump.

[0031] Please refer to Figure 1-6 , in an embodiment of the present utility model, the peristaltic pump includes an upper housing 1 and a lower housing 2, a pump tube (not shown in the drawings), a rotating assembly 4, a transmission assembly 5, and a driving device 6; the upper housing 1 and the lower housing 2 enclose a first accommodating cavity 3. The pump tube is used for transporting liquid and can be a tube made of a soft material. The rotating assembly 4 includes a turntable 41 and a rotor 42. One end of the rotor 42 is connected to the turntable 41, and the rotor 42 is used for squeezing the pump tube. The transmission assembly 5 includes a sun gear 51 and a plurality of connecting gears 52. The connecting gear 52 includes an upper connecting portion 521 and a lower connecting portion 522. The lower connecting portion 522 meshes with the sun gear 51, and the lower connecting portion 522 is also in tooth connection with the inner side wall tooth pattern of the lower housing 2. A second accommodating cavity 411 is recessed on one side of the turntable 41 close to the transmission assembly 5, and the upper connecting portion 521 is in tooth connection with the side wall tooth pattern of the second accommodating cavity 411. The driving device 6 is connected to the sun gear 51, and the driving device 6 can be a motor; the motor shaft of the motor is connected to the sun gear 51 to drive the sun gear 51 to rotate. The transmission assembly 5 and the rotating assembly 4 are both arranged in the first accommodating cavity 3 so that the upper housing 1 and the lower housing 2 protect the internal parts such as the transmission assembly 5 and the rotating assembly 4. The driving device 6 is arranged outside the first accommodating cavity 3, which can reduce the volume of the upper housing 1 and the lower housing 2 and reduce the manufacturing cost.

[0032] During operation, the driving device 6 drives the sun gear 51 to rotate. The sun gear 51 drives the lower connecting portion 522 of the connecting gear 52 to rotate, thereby causing the upper connecting portion 521 to move together. Further, the upper connecting portion 521 drives the turntable 41 connected to its tooth pattern. The rotation of the turntable 41 drives the rotor 42 of the turntable 41 to rotate around the rotation axis of the turntable 41. Thus, a negative pressure chamber is formed in the pump tube under the extrusion of the rotor 42 to transport liquid. It can be understood that in this technical solution, the setting of the transmission assembly 5 and the tooth pattern connection setting between the transmission assembly 5 and the lower housing 2 and the turntable 41 are equivalent to forming a transmission system similar to a two-stage planetary gear train. A two-stage planetary gear train is composed of two sets of planetary gears. Each set of planetary gears includes a sun gear 51, a planetary gear, and an internal gear ring (or external gear ring). This system can provide a high reduction ratio and has a relatively compact structure. The two-stage planetary gear train belongs to the prior art and will not be elaborated here. The difference between this technical solution and the conventional two-stage planetary gear train is that a connecting gear 52 is used instead of the single-layer gear in the conventional two-stage planetary gear train. With this setting, compared with using a single-layer planetary gear for the transmission connection between the sun gear 51 and the turntable 41, the number of components is reduced, the structure is simplified, which helps to reduce the occupied space of the transmission assembly 5 and can provide more moving space for the pump tube. In addition, since the upper connecting portion 521 of the connecting gear 52 is directly connected to the second accommodation cavity 411 of the turntable 41 by tooth pattern and the lower connecting portion 522 of the connecting gear 52 is directly connected to the lower housing 2 by tooth pattern, it is equivalent to integrating the components (tooth ring, gear ring, etc.) used for meshing with the connecting gear 52 on the turntable 41 and the lower housing 2, or directly setting tooth patterns at the corresponding positions of the turntable 41 and the lower housing 2 for connection. With this setting, the structure is more compact, further reducing the occupied space of the transmission assembly 5 and providing more moving space for the pump tube. Since more moving space is provided for the pump tube, the degree of limitation of the moving space of the pump tube is reduced, the friction is reduced, and thus the service life of the peristaltic pump can be extended.

[0033] In one embodiment, preferably, the inner side wall of the lower housing 2 is annularly provided with a first internal tooth pattern 21, and the first internal tooth pattern 21 meshes with the lower connecting portion 522. That is, on the inner side wall of the lower housing 2, the required tooth shape and number of teeth are directly formed by milling, hobbing, or gear shaping. In this way, the number of components can be reduced, the assembly complexity can be reduced, and the rigidity and reliability of the system can be improved. At the same time, since the number of connecting components is reduced, the failure points of the system can also be reduced. Also, the inner side wall of the second accommodation cavity 411 can also be directly annularly provided with a second internal tooth pattern 412, and the second internal tooth pattern 412 meshes with the upper connecting portion 521. It can be understood that in some embodiments, only one of the lower housing 2 and the second accommodation cavity 411 may adopt the method of directly setting tooth patterns to form a tooth pattern connection, while the other may adopt the method of integrating independent components such as tooth rings and gear rings onto the inner side wall to form a tooth pattern connection.

[0034] In some embodiments, the transmission assembly 5 further includes a planet carrier 8 and a first pin 81 disposed on the planet carrier 8; the planet carrier 8 is located on the side of the connecting gear 52 close to the second accommodation cavity 411, and a plurality of connecting gears 52 are rotatably inserted on the pins. The planet carrier 8 and the first pin 81 are used to support the connecting gear 52 so that the connecting gear 52 performs "revolution" and "rotation".

[0035] Specifically, in one embodiment, the planet carrier 8 further includes a second pin 82; the second pin 82 is disposed on the side of the planet carrier 8 facing away from the connecting gear 52 and is located at the center of the planet carrier 8; the second pin 82 is rotatably connected to the bottom wall of the second accommodation cavity 411. The second pin 82 being located at the center of the planet carrier 8 can balance the load and improve the meshing accuracy of the connecting gear 52. In addition, the range swept by the planet carrier 8 during rotation can be reduced, making the rotation range of the planet carrier 8 coincide with its own size, thereby reducing the occupied space.

[0036] In one embodiment, preferably, the transmission assembly 5 includes three connecting gears 52, and the planet carrier 8 includes three first pins 81; for two adjacent first pins 81, an angle is formed with the planet carrier 8 as the vertex; all the angles are equal. With such an arrangement, the transmission assembly 5 can achieve a more uniform load distribution, reducing stress concentration caused by uneven loads; thereby contributing to improving the stability and operating accuracy of the entire transmission system, reducing vibration and noise, and thus improving the overall transmission efficiency.

[0037] Furthermore, preferably, the center of the planet carrier 8 and the axis of the sun gear 51 are located on the same straight line. With such an arrangement, a more uniform load distribution can be further achieved, reducing vibration and noise caused by eccentricity. Since the components are aligned on the same axis, the space can be utilized more effectively, further reducing the occupation of the space inside the housing.

[0038] In one embodiment, the transmission system formed by the sun gear 51, the connecting gear 52, the planet carrier 8, the first internal tooth pattern 21 and the second internal tooth pattern 412 is equivalent to a quasi-two-stage planetary gear train; among them, it includes a first-stage planetary gear train and a second-stage differential gear train. In the first-stage planetary gear train: the sun gear 51 is connected to the driving device 6, and the driving device 6 drives the sun gear 51; the sun gear 51 meshes with the lower connecting portion 522 of the connecting gear 52, causing the connecting gear 52 to rotate about its own axis; at the same time, the lower connecting portion 522 of the connecting gear 52 meshes with the first internal tooth pattern 21, causing the connecting gear 52 to revolve around the center of the planet carrier 8. In the second-stage differential gear train: the upper connecting portion 521 of the connecting gear 52 revolves around the center of the planet carrier 8, and the upper connecting portion of the connecting gear 52 meshes with the second internal tooth pattern 412 to form self-rotation; for the turntable 41 where the second internal tooth pattern 412 is located, it is equivalent to forming reverse self-rotation. Through the above differential planetary gear system, the purpose of reducing speed and increasing torque is achieved. Preferably, the total transmission ratio of the differential planetary gear system is 22:1, that is, the transmission ratio between the sun gear 51 and the second internal tooth pattern 412 is 22:1.

[0039] Specifically, the number of teeth of the sun gear 51 can be 9, the number of teeth of the first internal tooth pattern 21 can be 27, and the number of teeth of the second internal tooth pattern 412 can be 33. Further, the number of teeth of the connecting gear 52 can also be set to 9.

[0040] In some embodiments, the number of teeth of the upper connecting portion 521 is the same as that of the lower connecting portion 522, and the diameter of the upper connecting portion 521 is smaller than that of the lower connecting portion 522. Since the turntable 41 is located inside the upper housing 1, and the turntable 41 itself also has a certain volume; therefore, in order to keep the thickness and outer peripheral wall of the upper housing 1 and the lower housing 2 consistent for facilitating processing and manufacturing, the sizes of the second accommodating cavity 411 formed by the turntable 41 and the part of the lower housing 2 for accommodation are not the same. Furthermore, in order to adapt to the space size and make the structure more compact, the diameter of the upper connecting portion 521 can be set to be smaller than that of the lower connecting portion 522.

[0041] In one embodiment, the peristaltic pump further includes a pump nozzle 7, and the pump nozzle 7 is located outside the upper housing 1 for connecting the peristaltic pump to other containers or connecting pipes, and thus liquid can be transported.

[0042] The above are only exemplary embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A peristaltic pump, characterized in that: include: An upper shell and a lower shell, wherein the upper shell and the lower shell are arranged to form a first accommodating cavity; Pump tubing, used to transport liquids; A rotating assembly, the rotating assembly comprising a turntable and a rotor, one end of the rotor being connected to the turntable, and the rotor being used to squeeze the pump tube; A transmission assembly, the transmission assembly includes a sun gear and a plurality of connecting gears, the connecting gear includes an upper connecting portion and a lower connecting portion, the lower connecting portion is meshed with the sun gear, and the lower connecting portion is also connected to the inner wall tooth pattern of the lower shell; the turntable is recessed on one side close to the transmission assembly to form a second accommodating cavity, and the upper connecting portion is connected to the side wall tooth pattern of the second accommodating cavity; A driving device, the driving device is connected to the sun gear to drive the sun gear to rotate; The transmission assembly and the rotating assembly are both arranged in the first accommodating cavity; and the driving device is arranged outside the first accommodating cavity.

2. The peristaltic pump according to claim 1, characterized in that The transmission assembly also includes a planet carrier and a first latch arranged on the planet carrier; the planet carrier is located on a side of the connecting gear close to the second accommodating cavity, and a plurality of connecting gears are rotatably inserted on the latch.

3. The peristaltic pump according to claim 2, characterized in that The planet carrier further comprises a second latch; the second latch is arranged on a side of the planet carrier facing away from the connecting gear and is located at the center of the planet carrier; the second latch is rotatably connected to the bottom wall of the second accommodating cavity.

4. The peristaltic pump according to claim 2, characterized in that The transmission assembly includes three connecting gears, and the planet carrier includes three first latches; two adjacent first latches form an angle with the planet carrier as the vertex; and the angles are all equal.

5. The peristaltic pump according to any one of claims 3 or 4, characterized in that: The center of the planet carrier and the axis of the sun gear are located on the same straight line.

6. The peristaltic pump according to claim 2, characterized in that The inner wall of the lower shell is provided with a first inner tooth pattern, and the first inner tooth pattern is meshed with the lower connecting portion; And / or, the inner side wall of the second accommodating cavity is provided with a second inner tooth pattern, and the second inner tooth pattern is meshed with the upper connecting portion.

7. The peristaltic pump according to claim 6, characterized in that The transmission ratio between the sun gear and the second internal tooth pattern is 22:

1.

8. The peristaltic pump according to claim 7, characterized in that The number of teeth of the sun gear is 9, the number of teeth of the first internal tooth pattern is 27, and the number of teeth of the second internal tooth pattern is 33.

9. The peristaltic pump according to claim 8, characterized in that The connecting gear has 9 teeth.

10. The peristaltic pump according to claim 1, characterized in that The upper connecting portion and the lower connecting portion have the same number of teeth, and the diameter of the upper connecting portion is smaller than the diameter of the lower connecting portion.

Images