Peristaltic pump

Abstract

The utility model relates to a peristaltic pump which comprises a pump shell, a roller assembly, a pump pipe and a driving assembly, and the roller assembly is rotationally installed in the pump shell; the pump pipe partially surrounds the roller assembly and abuts against the pump shell, and the pump pipe can elastically deform under extrusion of the roller assembly and control the flow of water in the pump pipe. The driving assembly comprises a motor, a spherical turbine and a worm, the worm is in transmission connection with the motor and is not connected with the pump shell, and the spherical turbine is in transmission connection with the worm and the roller assembly. By means of the structural characteristics of the spherical turbine, transmission between the spherical turbine and the worm is more stable, abrasion between the spherical turbine and the worm can be reduced when the spherical turbine and the worm are in transmission connection, and noise can be lowered. In addition, a limiting structure for limiting the worm to the pump shell can be omitted, and the worm and the pump shell are not connected, so that the effects of simplifying the structure of the pump shell and reducing the cost can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field related to flow control, and particularly relates to a peristaltic pump. Background Art

[0002] Peristaltic pumps have the characteristics of simple structural principle, no pollution, stable fluid flow, reversible fluid, and dry operation. They are widely used in various electrical equipment to realize automatic flow control.

[0003] At present, the transmission structure in the existing peristaltic pump is usually a turbine worm, so that when the peristaltic pump is working, the motor starts and drives the worm to rotate, and the roller assembly can be driven to rotate through the inclined turbine, and then the roller on the roller assembly squeezes the pump tube to drive the pump tube to elastically deform and control the flow of water in the pump tube. However, since the teeth on the inclined turbine that are used to mesh with the worm are inclined structures, the inclined turbine will generate an oblique force when connected to the worm transmission, which will not only cause wear between the inclined turbine and the worm and generate noise, but also require a structure containing a bearing or a plastic part to be set on the end of the worm away from the motor to limit the worm, so as to ensure the coaxiality between the worm and the motor when the two are connected. Utility Model Content

[0004] Based on this, it is necessary to provide a peristaltic pump to address the technical problems existing in the prior art.

[0005] A peristaltic pump, the peristaltic pump comprising:

[0006] Pump housing;

[0007] A roller assembly is rotatably mounted in the pump housing;

[0008] A pump tube, partially disposed around the roller assembly and abutting against the pump housing, and the pump tube can be elastically deformed under the extrusion of the roller assembly;

[0009] A drive assembly is installed on the pump housing, and the drive assembly includes a motor, a spherical turbine and a worm. The worm is drivingly connected to the motor and is not connected to the pump housing. The spherical turbine is drivingly connected to the worm and the roller assembly respectively.

[0010] It can be understood that the structural characteristics of the spherical turbine can make the transmission between the spherical turbine and the worm gear smoother, which not only reduces the wear between the spherical turbine and the worm gear when the two are connected in transmission, but also reduces noise; in addition, due to the smooth transmission between the spherical turbine and the worm gear, the worm gear and the spherical turbine can avoid the need to limit the worm gear to the limiting structure on the pump casing during the transmission process. Combined with the fact that the worm gear and the pump casing are not connected to each other, this can simplify the structure of the pump casing and reduce costs.

[0011] In one embodiment, the pump housing is formed with a first chamber inwardly, and the worm and the spherical turbine are both disposed in the first chamber;

[0012] A gap is formed between an end of the worm gear away from the motor and a cavity wall of the first cavity.

[0013] In one embodiment, the roller assembly includes a roller support and a plurality of rollers, wherein the plurality of rollers are rotatably mounted on the roller support and abut against the pump pipes respectively;

[0014] Wherein, the roller bracket has a transmission shaft, and the transmission shaft is partially inserted into the spherical turbine and is circumferentially limited with the spherical turbine.

[0015] In one embodiment, the spherical turbine has an axial hole, and the axial hole can be plugged and matched with the transmission shaft;

[0016] The depth of the shaft hole is set to D1, and the length of the portion of the transmission shaft inserted into the shaft hole is set to D2, wherein 2D2≤D1.

[0017] It can be understood that, through the above-mentioned structural setting, the spherical turbine can be prevented from being limited by the transmission shaft, so that the assembly of the spherical turbine has a certain degree of freedom of movement, thereby preventing abnormal noise from occurring between the spherical turbine and the worm during transmission.

[0018] In one embodiment, the number of the rollers is two, and the two rollers are rotatably mounted on the roller bracket via connecting shafts.

[0019] In one embodiment, the displacement of the pump tube when it moves upward under the pressure of the roller assembly is set to D3, where 0.6 mm ≥ D3 ≥ 0.2 mm;

[0020] And, the displacement of the pump tube when it moves downward under the squeezing of the roller assembly is set to D4, where 0.6mm≥D4≥0.2mm.

[0021] It is understandable that limiting the displacement of the pump tube when it moves up and down under the squeeze of the roller assembly can not only improve the flow control accuracy of the peristaltic pump when it is working, but also ensure the negative pressure value before and after the life of the peristaltic pump.

[0022] In one embodiment, the pump housing includes a motor fixing seat and an upper cover, the upper cover is mounted on the motor fixing seat, and a second chamber is formed between the upper cover and the motor fixing seat, and the pump pipe is arranged in the second chamber;

[0023] Wherein, a first baffle is formed on the upper cover, and the first baffle can abut against the pump tube to limit the displacement of the pump tube when it moves upward.

[0024] It is understandable that the first baffle plate on the upper cover is used to limit the displacement of the pump tube when it moves upward, which can facilitate the structural design of limiting the displacement of the pump tube when it moves upward.

[0025] In one embodiment, the pump housing includes a motor fixing base and an upper cover, the upper cover is mounted on the motor fixing base, and a second chamber is formed between the upper cover and the motor fixing base, and the pump pipe portion is disposed in the second chamber;

[0026] Wherein, a second baffle is formed on the motor fixing seat, and the second baffle can abut against the pump pipe to limit the displacement of the pump pipe when it moves downward.

[0027] It is understandable that the second baffle on the motor fixing seat is used to limit the displacement of the pump tube when it moves downward, which can facilitate the structural design of the pump tube when it moves downward.

[0028] In one embodiment, the pump housing includes a motor fixing seat and a lower cover, the lower cover is mounted on the motor fixing seat, and a first chamber is formed between the lower cover and the motor fixing seat, and the worm and the spherical turbine are both arranged in the first chamber;

[0029] Wherein, the motor is fixedly mounted on the motor fixing seat.

[0030] In one of the embodiments, a bearing is embedded in the lower cover, and the bearing is connected to the spherical turbine in a loose fit manner.

[0031] Due to the application of the above technical solution, the present application has the following advantages compared with the prior art:

[0032] The peristaltic pump for which protection is sought in the present application utilizes the structural characteristics of the spherical turbine to make the transmission between the spherical turbine and the worm gear smoother, which not only reduces the wear between the spherical turbine and the worm gear when the two are connected in transmission, but also reduces noise; in addition, since the transmission between the spherical turbine and the worm gear is smooth, the worm gear and the spherical turbine can eliminate the need to limit the worm gear to a limiting structure on the pump casing during the transmission process. Combined with the worm gear being independently arranged on the pump casing, this can simplify the structure of the pump casing and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 This is a schematic diagram of the structure of the peristaltic pump provided in this application.

[0035] Figure 2 A schematic diagram of the partial structure of the peristaltic pump provided in this application;

[0036] Figure 3 This is a cross-sectional view of the peristaltic pump provided in this application.

[0037] Figure numerals: 100, peristaltic pump; 10, pump housing; 101, first chamber; 102, second chamber; 110, screw; 11, motor fixing seat; 111, second baffle; 12, upper cover; 121, first baffle; 13, lower cover; 131, bearing; 20, roller assembly; 21, roller bracket; 211, transmission shaft; 22, roller; 221, outer cylinder wall; 23, connecting shaft; 30, pump pipe; 41, motor; 42, spherical turbine; 421, shaft hole; 43, worm. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] It should be noted that when an element is referred to as being "provided on" another element, it may be directly provided on the other element or there may be a central element. When an element is considered to be "provided on" another element, it may be directly provided on the other element or there may be a central element at the same time. When an element is considered to be "fixed to" another element, it may be directly fixed to the other element or there may be a central element at the same time.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0041] The peristaltic pump 100 for which protection is sought in the present application specifically refers to a micro peristaltic pump used in electrical equipment.

[0042] like Figures 1 to 3 As shown, a peristaltic pump 100 provided in one embodiment of the utility model comprises a pump housing 10, a roller assembly 20, a pump tube 30 and a driving assembly, wherein the roller assembly 20 is rotatably mounted in the pump housing 10; the pump tube 30 is partially arranged around the roller assembly 20 and abuts against the pump housing 10, and the pump tube 30 can undergo elastic deformation under the extrusion of the roller assembly 20 and control the flow rate of water in the pump tube 30; the driving assembly is mounted on the pump housing 10, and the driving assembly comprises a motor 41, a spherical turbine 42 and a worm 43, the worm 43 is transmission-connected to the motor 41 and is not connected to the pump housing 10, and the spherical turbine 42 is transmission-connected to the worm 43 and the roller assembly 20, respectively.

[0043] It can be understood that the structural characteristics of the spherical turbine 42 can be used to make the transmission between the spherical turbine 42 and the worm 43 smoother, which can not only reduce the wear between the spherical turbine 42 and the worm 43 when they are connected in transmission, but also reduce noise; in addition, due to the smooth transmission between the spherical turbine 42 and the worm 43, the worm 43 and the spherical turbine 42 can save the need to limit the worm 43 to the limiting structure on the pump housing 10 during the transmission process. Combined with the fact that the worm 43 and the pump housing 10 are not connected to each other, this can simplify the structure of the pump housing 10 and reduce costs. It should be noted that when the spherical turbine 42 is connected in transmission with the worm 43, the working principle of how to make the transmission between the spherical turbine 42 and the worm 43 smoother can be adopted in the existing conventional manner, which will not be elaborated here.

[0044] like Figure 1 , Figure 3 As shown, the pump housing 10 includes a motor fixing base 11, an upper cover 12 and a lower cover 13, and the upper cover 12 and the lower cover 13 are arranged on the upper and lower sides of the motor fixing base 11 and are respectively connected to the motor fixing base 11. Here, the motor fixing base 11 and the upper cover 12 and the lower cover 13 can be detachably connected by screws 110, wherein the motor fixing base 11, the upper cover 12 and the lower cover 13 can be configured as plastic parts.

[0045] like Figure 3As shown, the motor fixing seat 11 and the lower cover 13 can enclose a first chamber 101, and the worm 43 and the spherical turbine 42 are arranged in the first chamber 101; the motor fixing seat 11 and the upper cover 12 can enclose a second chamber 102, and the pump pipe 30 is partially arranged in the second chamber 102; wherein, the roller assembly 20 is arranged through the motor fixing seat 11, and the motor 41 is fixedly installed on the motor fixing seat 11. Here, a gap is formed between the end of the worm 43 away from the motor 41 and the cavity wall of the first chamber 101, that is, the end of the worm 43 away from the motor 41 is not connected to the motor fixing seat 11, and the worm 43 and the pump housing 10 are not connected to each other.

[0046] like Figure 3 As shown, a bearing 131 is embedded in the lower cover 13, and the bearing 131 is loosely connected to the spherical turbine 42, so that the assembly between the spherical turbine 42 and the bearing 131 has a certain degree of freedom, which can prevent the worm 43 and the spherical turbine 42 from making abnormal noises due to the spherical turbine 42 being limited during the transmission process. Here, the bearing 131 is configured to contain a bearing.

[0047] like Figure 3 As shown, the roller assembly 20 includes a roller support 21 and a plurality of rollers 22, wherein the plurality of rollers 22 are rotatably mounted on the roller support 21 and respectively abut against the pump tube 30. Here, the number of rollers 22 is configured to be two, and the two rollers 22 are rotatably mounted on the roller support 21 through the connecting shaft 23, respectively, and the roller assembly 20 can squeeze the pump tube 30 with the outer cylinder walls 221 of the two rollers 22.

[0048] like Figure 3 As shown, the roller bracket 21 has a transmission shaft 211, and the transmission shaft 211 is partially inserted into the spherical turbine 42 and circumferentially limited with the spherical turbine 42, so that the spherical turbine 42 rotates under the drive of the worm 43. The circumferential limit between the transmission shaft 211 and the spherical turbine 42 can realize the rotational drive of the roller bracket 21, and the outer cylinder walls 221 of the two rollers 22 on the roller bracket 21 squeeze the pump tube 30.

[0049] like Figure 3 As shown, the spherical turbine 42 has an axial hole 421 , and the axial hole 421 can be plugged and matched with the transmission shaft 211 to achieve circumferential limitation between the transmission shaft 211 and the spherical turbine 42 .

[0050] The depth of the shaft hole 421 is set to D1, and the length of the portion of the transmission shaft 211 inserted into the shaft hole 421 is set to D2, wherein 2D2≤D1, so that the spherical turbine 42 can be prevented from being limited by the transmission shaft 211, so that the assembly between the spherical turbine 42 and the worm 43 has a certain amount of freedom of movement, thereby preventing the spherical turbine 42 and the worm 43 from making abnormal noises during the transmission process. Here, the spherical turbine 42 is prevented from being limited by the transmission shaft 211 by controlling the effective contact length between the transmission shaft 211 and the shaft hole 421.

[0051] like Figure 3 As shown, the displacement of the pump tube 30 when it moves upward under the squeezing of the roller assembly 20 is set to D3, wherein 0.6mm≥D3≥0.2mm; and, the displacement of the pump tube 30 when it moves downward under the squeezing of the roller assembly 20 is set to D4, wherein 0.6mm≥D4≥0.2mm. In this way, the displacement of the pump tube 30 when it moves up and down under the squeezing of the roller assembly 20 can be limited, which not only improves the flow control accuracy of the peristaltic pump 100 during operation, but also ensures the negative pressure value before and after the service life of the peristaltic pump 100. This is because when the pump tube 30 moves up and down, the consistency of the flow rate of the peristaltic pump during operation will deteriorate, and affect the negative pressure value before and after the service life of the peristaltic pump. Here, by controlling the pump tube 30 to move up and down within the range of 0.2mm and 0.6mm, the flow consistency of the peristaltic pump 100 during operation can be improved by 8% on the original basis, and the negative pressure before and after the life of the peristaltic pump 100 is controlled within 25%. In actual testing, the negative pressure value of the peristaltic pump 100 before the life of the peristaltic pump 100 is -70kpa, and the negative pressure value of the peristaltic pump 100 after 200 hours of effective life is -65kpa.

[0052] like Figure 3 As shown, a first baffle 121 is formed on the upper cover 12, and the first baffle 121 can abut against the pump tube 30, and is used to limit the displacement of the pump tube 30 when it moves upward, so that it is convenient to design a structure for limiting the displacement of the pump tube 30 when it moves upward. Here, the first baffle 121 is set as an arc structure to match the structural setting of the pump tube 30. Of course, in other embodiments, the structure for limiting the displacement of the pump tube 30 when it moves upward can also be set on the roller 22 of the roller assembly 20, which will not be elaborated here.

[0053] like Figure 3As shown, a second baffle 111 is formed on the motor fixing seat 11, and the second baffle 111 can abut against the pump tube 30, and is used to limit the displacement of the pump tube 30 when it moves downward, so that it is convenient to design a structure for limiting the displacement of the pump tube 30 when it moves downward. Here, the second baffle 111 is also set as an arc structure to match the structural setting of the pump tube 30. Of course, in other embodiments, the structure for limiting the displacement of the pump tube 30 when it moves downward can also be set on the roller 22 of the roller assembly 20, which will not be elaborated here.

[0054] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A peristaltic pump, characterized in that: The peristaltic pump (100) comprises: Pump housing (10); A roller assembly (20) is rotatably mounted in the pump housing (10); A pump tube (30) is partially disposed around the roller assembly (20) and abuts against the pump housing (10), and the pump tube (30) is capable of elastic deformation under the extrusion of the roller assembly (20); A drive assembly is mounted on the pump housing (10), the drive assembly comprising a motor (41), a spherical turbine (42) and a worm (43), the worm (43) being drivingly connected to the motor (41) and not connected to the pump housing (10), and the spherical turbine (42) being drivingly connected to the worm (43) and the roller assembly (20), respectively.

2. The peristaltic pump according to claim 1, characterized in that: The pump housing (10) is formed with a first chamber (101) inwardly, and the worm (43) and the spherical turbine (42) are both arranged in the first chamber (101); A gap is formed between an end of the worm (43) away from the motor (41) and the cavity wall of the first chamber (101).

3. The peristaltic pump according to claim 1, characterized in that: The roller assembly (20) comprises a roller support (21) and a plurality of rollers (22), wherein the plurality of rollers (22) are rotatably mounted on the roller support (21) and are respectively in contact with the pump pipe (30); Wherein, the roller bracket (21) has a transmission shaft (211), and a portion of the transmission shaft (211) is inserted into the spherical turbine (42) and is circumferentially limited with the spherical turbine (42).

4. The peristaltic pump according to claim 3, characterized in that: The spherical turbine (42) has an axial hole (421), and the axial hole (421) can be plugged and matched with the transmission shaft (211); The depth of the shaft hole (421) is set to D1, and the length of the portion of the transmission shaft (211) inserted into the shaft hole (421) is set to D2, wherein 2D2≤D1.

5. The peristaltic pump according to claim 3, characterized in that: The number of the rollers (22) is two, and the two rollers (22) are rotatably mounted on the roller bracket (21) via connecting shafts (23) respectively.

6. The peristaltic pump according to claim 1, characterized in that: The displacement of the pump tube (30) when it moves upward under the pressure of the roller assembly (20) is set to D3, where 0.6 mm ≥ D3 ≥ 0.2 mm; And, the displacement of the pump tube (30) when it moves downward under the pressure of the roller assembly (20) is set to D4, where 0.6 mm ≥ D4 ≥ 0.2 mm.

7. The peristaltic pump according to claim 6, characterized in that: The pump housing (10) comprises a motor fixing seat (11) and an upper cover (12), wherein the upper cover (12) is mounted on the motor fixing seat (11), and a second chamber (102) is formed between the upper cover (12) and the motor fixing seat (11), and a portion of the pump pipe (30) is disposed in the second chamber (102); Wherein, a first baffle (121) is formed on the upper cover (12), and the first baffle (121) can abut against the pump tube (30) to limit the displacement of the pump tube (30) when it moves upward.

8. The peristaltic pump according to claim 6, characterized in that: The pump housing (10) comprises a motor fixing seat (11) and an upper cover (12), wherein the upper cover (12) is mounted on the motor fixing seat (11), and a second chamber (102) is formed between the upper cover (12) and the motor fixing seat (11), and a portion of the pump pipe (30) is disposed in the second chamber (102); A second baffle (111) is formed on the motor fixing seat (11), and the second baffle (111) can abut against the pump tube (30) to limit the displacement of the pump tube (30) when it moves downward.

9. The peristaltic pump according to claim 1, characterized in that: The pump housing (10) comprises a motor fixing seat (11) and a lower cover (13), wherein the lower cover (13) is mounted on the motor fixing seat (11), and a first chamber (101) is formed between the lower cover (13) and the motor fixing seat (11), and the worm (43) and the spherical turbine (42) are both arranged in the first chamber (101); Wherein, the motor (41) is fixedly mounted on the motor fixing seat (11).

10. The peristaltic pump according to claim 9, characterized in that A bearing (131) is embedded in the lower cover (13), and the bearing (131) is connected to the spherical turbine (42) in a loose-fitting manner.

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