Pump head of peristaltic pump

Abstract

The embodiment of the utility model discloses a peristaltic pump head which comprises a shell and an upper cover, the upper cover is fixed on the shell, a roller assembly is mounted in the shell and comprises a roller support, a roller body and a guide structure, two ends of the guide structure are fixed on the roller support, and the roller body is fixed on the roller support. The upper surface of the guide structure is an arc concave face, the portion between the shell and the roller body is used for containing a hose, and the arc concave face is used for guiding and positioning the hose. According to the peristaltic pump head provided by the scheme, the guide structure is additionally arranged on the roller bracket, and the guide structure has a guide effect on the hose and can rotate along with the roller bracket to realize self-positioning and middle position alignment of the hose, so that the abnormal wear of the hose is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of peristaltic pump, in particular to a peristaltic pump head. BACKGROUND

[0002] The peristaltic pump runs by relying on the rollers and the shell to extrude the hose, and the hose is in the best state in the middle of the roller axis, which can eliminate abnormal contact wear and make the flow output pulsation relatively stable. Therefore, the key process of assembling the peristaltic pump is to install the hose to the middle of the roller axis, if it cannot be installed in place, whether it is biased up or down, it may cause abnormal wear of the hose, and abnormal wear will cause the hose to break and cause liquid transmission to be interrupted, resulting in liquid leakage.

[0003] Since the basic working principle of the peristaltic pump is to ensure that at least one roller is in extrusion with the hose at any time, therefore, installing the hose in the middle of the roller axis will greatly increase the difficulty of the assembly process, even skilled installers on the production line cannot guarantee that the hose is installed in the middle position at one time. Therefore, for ordinary users of the peristaltic pump, it is even more impossible to install the hose well in the middle of the roller axis when replacing the hose. SUMMARY

[0004] To solve the above technical problems, the embodiments of the present application are implemented as follows:

[0005] The peristaltic pump head provided by the embodiments of the present application comprises a shell and an upper cover, the upper cover is fixed on the shell, a roller assembly is installed inside the shell, the roller assembly comprises a roller support, a roller body and a guide structure, the guide structure is fixed at both ends of the roller support, the upper surface of the guide structure is a circular arc concave surface, the shell and the roller body are used to accommodate the hose, and the circular arc concave surface is used to guide and position the hose.

[0006] Optionally, the guide structure is arranged at the middle position of the two roller bodies.

[0007] Optionally, the guide structure is one, two or more.

[0008] Optionally, when the guide structure is multiple, the guide structures are evenly arranged on the roller support.

[0009] Optionally, the distance between the two tangent points of the circular arc concave surface satisfies A≥1.3a, wherein A represents the distance between the two tangent points of the circular arc concave surface, and a represents the length of the long semi-axis of the ellipse formed after the hose is extruded.

[0010] Optionally, the depth of the circular arc concave surface satisfies 0.14A≤D≤0.16A, wherein D represents the depth of the circular arc concave surface.

[0011] Optionally, the guide structure is a thin plate type structure.

[0012] Optionally, the guide structure is provided with a reinforcing rib.

[0013] The above at least one technical scheme adopted by the embodiments of the present specification can achieve the following beneficial effects:

[0014] The present application proposes a new peristaltic pump head, a guide structure is added on the roller support, the guide structure has a guiding effect on the hose, and can realize self-positioning of the hose to the middle position by rotating with the roller support, thereby reducing abnormal wear of the hose. BRIEF DESCRIPTION OF DRAWINGS

[0015] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0016] Figure 1 A perspective structure explosion view of a peristaltic pump head provided by the embodiments of the present specification;

[0017] Figure 2 A sectional view of part of the internal structure of the peristaltic pump head;

[0018] Figure 3a A perspective view of the positional relationship between the roller support and the guide structure;

[0019] Figure 3b A plan view of the positional relationship between the roller support and the guide structure;

[0020] Figure 4 A perspective view of the guide structure;

[0021] Figure 5 A design analysis diagram of the guide structure parameters;

[0022] Figure 6 An auxiliary demonstration positioning hose diagram of the guide structure;

[0023] Reference signs: 1 - upper cover; 2, roller support; 3, roller; 4, outer shell; 5, motor; 6, motor fixing plate; 7, pipe joint; 8, hose; 9, guide structure. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] To address this technical problem, this application proposes a novel peristaltic pump head, which adds a guide structure to the roller bracket. This guide structure guides the hose and, as the roller bracket rotates, enables the hose to self-position and find its center position, thereby reducing abnormal wear on the hose.

[0026] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0027] like Figure 1 As shown, the basic structure of the peristaltic pump head provided by this solution includes: an upper cover 1, a housing 4, and a motor 5. The upper cover 1 is fixed to the housing 4 by a snap fastener, which limits the movement of the roller body and protects the entire pump head.

[0028] The housing 4 and the motor 5 are fixedly connected by the motor mounting plate 6. A roller assembly is installed inside the housing 4. The roller assembly includes a roller bracket 2 and a roller body 3. The roller bracket 2 supports the rotation of the roller, and the rotation shaft of the roller body 3 can be connected to the output shaft of the driver; it also acts as a pressure block. The hose 8 transmits the medium under the compression of the housing 4 and the roller body 3.

[0029] The peristaltic pump head may also include: a pipe connector 7, which serves to fix the hose and connect to the fixed housing 4.

[0030] Unlike existing technologies, such as Figure 2 As shown, the roller assembly of this solution also includes a guide structure 9. The two ends of the guide structure 9 are fixed to the two ends of the roller bracket 2. The upper surface of the guide structure 9 is designed as a concave arc surface, which is used to guide and position the hose 8.

[0031] like Figures 2-6 As shown, the guide structure 9 can be one, two, or more. When there is only one guide structure 9 (not shown in the figure), the guide structure 9 can be set between any two roller bodies 3, which can be between two adjacent roller bodies 3 or between two non-adjacent roller bodies 3.

[0032] When there are multiple guide structures 9, they can be set between two adjacent roller bodies 3. One guide structure 9 can be set between two adjacent roller bodies 3, or two or more guide structures 9 can be set.

[0033] Preferably, when there are multiple guide structures 9, the guide structures are uniformly arranged on the roller support 2, and the positioning and guiding effect is better.

[0034] As a more optimized solution, the guide structure is located at the middle position between any two roller bodies, and the positioning and guiding effect is better.

[0035] The above embodiment is introduced with a peristaltic pump head including at least two roller bodies. When the peristaltic pump head has only one roller body, a guide structure can also be provided, and the position thereof is not limited.

[0036] In addition, the guide structure can be designed in various shapes, and the preferred structure is a thin plate type with low cost. The height of the thin plate can be set as needed, and it is necessary to consider the length and depth of the circular arc concave surface and the compression resistance of the plate material.

[0037] In addition, considering the compression effect of the guide structure, a reinforcing rib can also be provided on the guide structure to increase the strength of the thin plate. Since the guide structure is connected to the roller support at both ends, the reinforcing rib can also strengthen the strength of the roller support.

[0038] Since the structure for positioning and guiding is a circular arc concave surface, the parameters of the circular arc concave surface need to be limited for better effect.

[0039] As shown in Figure 2 When the peristaltic pump head is working, the hose 8 is compressed, and the cross section of the hose is approximately an ellipse, and then the circumference of the ellipse is approximately L=2πb+4(a-b) (Formula 1), wherein a represents the length of the long semi-axis of the ellipse, and b represents the length of the short semi-axis of the ellipse.

[0040] And the outer diameter circumference C of the hose is C=2×π×R (Formula 2), wherein R is the outer diameter radius of the hose, which is a known quantity.

[0041] Under the working pressure condition of the conventional elastic tube of the peristaltic pump, C≈L can be considered; the outer diameter circumference C of the elastic hose of a certain type is known data, the elastic tube is compressed to the limit and needs to transmit medium, the length b of the short semi-axis is related to the type and wall thickness of the elastic hose, and can also be considered as known data, and then the value of the long semi-axis a can be derived according to Formula 1:

[0042]

[0043] Another inventive point of the present solution is that the axial length A of the roller support guide structure is determined according to the length a of the long semi-axis.

[0044] As shown in Figure 5As shown, A is the distance between two tangent points of the circular arc of the guide structure: A=k×a (formula 4).

[0045] According to design experience, the coefficient k in the above formula 4 is greater than or equal to 1.3; that is, A≥1.3a.

[0046] That is, when the model of the hose is determined, the outer diameter R and the circumference C of the hose are determined values, and the short semi-axis b can also be determined, then the design value range of A can be obtained by combining formula 3 with formula 4.

[0047] As preferred, the present scheme also limits the range of the curve depth D of the guide structure, as shown in Figure 5 As shown, the value range of D is obtained through a large amount of data verification: 0.14A≤D≤0.16A.

[0048] It should be further noted that the terms "comprising", "containing" or any other variant thereof are intended to cover non-exclusive inclusion, so that the peristaltic pump head including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such peristaltic pump head. Without more limitations, the element defined by the statement "including a" does not exclude the existence of another same element in the peristaltic pump head including the element.

[0049] The above only describes the embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the scope of claims of the present application.

Claims

1. A peristaltic pump head characterized by, The utility model relates to a kind of soft pipe rolling device, including: Housing and upper cover, the upper cover is fixed on the housing, the inside installation gyro wheel assembly of the housing, the gyro wheel assembly includes gyro wheel support, gyro wheel body and guide structure, the guide structure both ends are fixed on the gyro wheel support, the upper surface of the guide structure is circular arc concave surface, for accommodating hose between the housing and the gyro wheel body, the circular arc concave surface is used to guide and position hose.

2. A peristaltic pump head as claimed in claim 1, wherein, The guide structure is arranged in the middle position of the two gyro wheel bodies.

3. The peristaltic pump head of claim 1, wherein, The guide structure is one, two or more.

4. The peristaltic pump head of claim 1, wherein, When the guide structure is multiple, the guide structure is evenly arranged on the gyro wheel support.

5. The peristaltic pump head of claim 1, wherein, The distance between the two tangent points of the circular arc concave surface satisfies: A≥1.3a, wherein A represents the distance between the two tangent points of the circular arc concave surface, and a represents the length of the major axis of the ellipse formed after the hose is squeezed.

6. The peristaltic pump head of claim 5, wherein, The depth of the circular arc concave surface satisfies: 0.14A≤D≤0.16A, wherein D represents the depth of the circular arc concave surface.

7. The peristaltic pump head of claim 1 wherein, The guide structure is a thin plate type structure.

8. A peristaltic pump head as claimed in claim 7, wherein, The guide structure is provided with a reinforcing rib.

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