Connecting rod assembly and miniature electromagnetic pump
By designing a connecting rod assembly with a limiting section and a deformable section in the micro electromagnetic pump, the problems of laborious assembly of the movable iron core and connecting rod and the generation of debris were solved, resulting in lower assembly resistance and wear, and improved equipment performance.
Patent Information
- Application Number
- CN202422950399.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-12-02
AI Technical Summary
In existing micro electromagnetic pumps, the movable iron core and connecting rod are assembled using an interference fit, which makes assembly laborious and generates debris, increasing wear and noise.
A limiting section is used to axially limit the movable iron core, and a deformable section is used to press against the inner step to reduce the friction area and stroke during assembly. The connecting rod assembly is designed to reduce assembly resistance and debris generation.
It effectively reduces resistance and debris generation during the assembly of movable iron cores, reduces wear and noise, and improves assembly efficiency and equipment life.
Smart Images
Figure CN223563019U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to micro electromagnetic pump technical field especially a connecting rod assembly and micro electromagnetic pump. BACKGROUND
[0002] Micro electromagnetic pump is a kind of micro pump using electromagnetic force to drive liquid flow, it plays an important role in medical equipment, laboratory instrument, chemical equipment and many other fields.Micro electromagnetic pump usually includes shell, excitation assembly with electromagnetic winding, fixed core, movable core, connecting rod fixedly connected movable core, working part connected to the other side end of connecting rod and reset spring.When current passes through electromagnetic winding, the magnetic field generated by electromagnetic winding magnetizes fixed core and movable core, so that movable core moves towards fixed core;When current is disconnected, reset spring pushes fixed core back to original position.Thus, by applying periodic current to winding, movable core can drive working part to reciprocate periodically through connecting rod.
[0003] The micro electromagnetic pump in prior art, movable core and connecting rod are usually assembled by interference fit, and the assembly is more laborious.In addition, movable core and connecting rod will produce debris during assembly, which will aggravate the wear, vibration, noise and other problems of internal parts of micro electromagnetic pump.
[0004] The above problems of connecting rod and movable core caused by interference fit assembly also exist in micro electromagnetic valve. UTILITY MODEL CONTENTS
[0005] In view of the above-mentioned many adverse effects caused by interference fit assembly of movable core and connecting rod, the purpose of the utility model is to provide a connecting rod assembly with new assembly method and a micro electromagnetic pump with the connecting rod assembly.
[0006] In order to achieve the above-mentioned purpose, the utility model provides the following first technical scheme: a connecting rod assembly is suitable for micro electromagnetic pump / micro electromagnetic valve, the micro electromagnetic pump / micro electromagnetic valve has movable work parts, the connecting rod assembly includes connecting rod and movable core that can be assembled and separated from the connecting rod along the axial direction, the connecting rod has the core end and the connecting end that are away from each other along the axial direction, the connecting end is configured to be suitable for connecting the work parts, the core end includes the deformable section that can be radially deformed and the limiting section that is located in the inside of the deformable section, the deformable section is provided with the waist-shaped hole that extends along the axial direction, and the limiting section has the limiting surface that can limit the movable core in the axial direction, the movable core has the inner cavity that can be passed through by the connecting rod and the inner step that extends to the inner cavity, and the inner step has the minimum inner diameter of the movable core, when the movable core is assembled on the connecting rod, the inner step presses the deformable section, and the deformable section is radially deformed.
[0007] In the above-mentioned first technical scheme, preferably, the contact position of the inner step and the deformable section is located on the inside of the waist-shaped hole when observing in the horizontal direction.
[0008] In the above-mentioned first technical scheme, preferably, the limiting section is provided with a plurality of radial protruding ribs, and when the movable core is installed on the connecting rod, the plurality of ribs press the wall surface of the inner cavity.
[0009] In the above-mentioned first technical scheme, preferably, the inner step is close to or located at one side end of the core.
[0010] In the above-mentioned first technical scheme, preferably, the core end further includes a rigid section, and the rigid section, the deformable section and the limiting section are sequentially arranged along the axial direction.
[0011] In the above-mentioned first technical scheme, preferably, the deformable section includes a first part with a first wall thickness and a second part with a second wall thickness smaller than the first wall thickness, and when the movable core is assembled on the connecting rod, the wall surface of the inner cavity presses the first part.
[0012] In addition, the utility model also provides the following second technical scheme: a micro electromagnetic pump includes the connecting rod assembly as any one of the above-mentioned first technical scheme and preferred scheme, further includes a shell, work parts movably arranged in the shell, a fixed core fixedly arranged in the shell, an excitation assembly fixedly arranged in the shell and a return spring, the excitation assembly can generate a magnetic field for magnetizing the fixed core and the movable core, and the return spring contacts the movable core to apply a force for resetting the movable core.
[0013] Compared with the prior art, the connecting rod assembly provided by the technical scheme of the utility model is limited in the axial direction by the limiting section when assembled, and the inner step of the movable iron core is pressed by the deformable section, so that the iron core moves in the axial direction. Since the connecting rod assembly provided by the technical scheme of the utility model is assembled, only a small part including the inner step of the movable valve core contacts the connecting rod, the friction area and stroke are short, and the resistance and debris generated by the movable valve core during assembly are greatly reduced. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 The utility model provides a perspective view of the connecting rod assembly; wherein the movable iron core is relatively separated from the connecting rod;
[0015] Figure 2 For Figure 1 The utility model provides a perspective view of the connecting rod assembly; wherein the movable iron core is relatively separated from the connecting rod;
[0016] Figure 3 The utility model provides a perspective view of the connecting rod assembly; wherein the movable iron core is relatively separated from the connecting rod;
[0017] Figure 4 The utility model provides a perspective view of the connecting rod assembly; wherein the movable iron core is relatively separated from the connecting rod; Figure 3 The utility model provides a perspective view of the connecting rod assembly; wherein the movable iron core is relatively separated from the connecting rod.
[0018] Markings in the figure:
[0019] 10, connecting rod; 20, movable iron core; 100, micro electromagnetic pump;
[0020] 11, rigid section; 12, deformable section; 13, limiting section; 14, waist-shaped hole; 15, rib; 16, limiting surface; 17, connecting end;
[0021] 21, inner step;
[0022] 3, outer shell; 4, fixed iron core; 51, support; 52, excitation winding; 6, working part; 7, reset spring;
[0023] Y, axial line. DETAILED DESCRIPTION
[0024] To describe the technical content, structural features, purposes and effects of the present application in detail, the technical scheme in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.
[0025] In this application, spatially relative terms, such as "beneath", "below", "lower", "under", "above", "upper", "on", "higher", "side" (as in "sidewall"), and the like, can be used herein for ease of description to describe one element's or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture in addition to the orientations depicted in the figures. For example, if a device in the figures is inverted, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The devices can be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
[0026] In this application, the term "axial" means the direction of the axial centerline of a component; the term "radial" means the direction perpendicular to the axial centerline direction of the component;
[0027] In this application, the term "inner diameter" means the radius of the inner profile surface of a solid component relative to its axial centerline; the term "outer diameter" means the radius of the outer profile of a solid component relative to its axial centerline.
[0028] As Figure 1 shown in the drawings, the utility model provides a connecting rod assembly suitable for micro electromagnetic pump or micro electromagnetic valve, which aims at reducing the assembly difficulty of traditional micro electromagnetic pump connecting rod assembly and the debris generated in the assembly process.
[0029] In combination Figure 2 , the connecting rod assembly comprises a connecting rod 10 extending along an axial centerline Y direction and a movable iron core 20 detachably mounted on the connecting rod 10. The connecting rod 10 has an iron core end (not marked in the figure) and a connecting end 17 away from each other in the axial direction, the iron core end is configured to be suitable for mounting the movable iron core 20, and the connecting end 17 is configured to be suitable for connecting the working components of the micro electromagnetic pump / micro electromagnetic valve. Among them, for the micro electromagnetic pump, the "working components" are the components used to transport fluid, such as pistons, diaphragms, etc.; for the micro electromagnetic valve, the "working components" are the components used to control the flow of fluid, such as valve cores, plungers, etc.
[0030] The iron core end of the connecting rod 10 comprises a rigid section 11, a deformable section 12 which can be deformed in the radial direction, and a limiting section 13 for limiting the movable iron core 20, the rigid section 11, the deformable section 12 and the limiting section 13 are configured to be arranged in sequence along the direction of the iron core end 1 pointing to the connecting end 17.
[0031] The rigid section 11 is located at the head of the core end 1. The core end 1 is provided with a waist-shaped hole 14 extending along the axial line Y, which is adjacent to the rigid section 11 and endows the solid part in the radial direction with the ability to deform in the radial direction, thus forming the deformable section 12. The limiting section 13 has a limiting face 16 extending in the radial direction on the side away from the deformable section 12, so as to limit the axial movement of the movable core 20.
[0032] The movable core 20 is defined with an inner cavity (not shown in the figure) for the passage of the connecting rod 10 and has an inner step 21 protruding into the inner cavity, which has the minimum inner diameter of the inner cavity 3. When the movable core 20 is assembled on the core end 1 of the connecting rod 10 in the axial direction, the inner step 21 of the movable core 20 contacts and presses the deformable section 12, so that the deformable section 12 deforms in the radial direction, thus avoiding the axial movement of the movable core 20. The inner step 21 is formed on one end of the movable core 20.
[0033] In the above assembly process, only a small part of the movable core 20 including the inner step 21 contacts the connecting rod 10, and the friction area and effective stroke are small. Thus, the resistance received by the movable core 20 during assembly and the generated debris can be reduced.
[0034] When viewed in the horizontal direction, the contact position of the inner step 21 and the deformable section 12 is located inside the waist-shaped hole 14, i.e. the above-mentioned contact position is located inside the two end points of the deformable section 12. When the micro electromagnetic pump is actually operated, the temperature of the connecting rod 10 rises, and the radial outward deformation of the contact part of the deformable section 12 due to the temperature rise is inhibited by the inner step 21, and the part of the deformable section 12 located outside the above-mentioned contact part can freely expand and contract with heat. Thus, a small step structure is formed between the above-mentioned contact part and the part outside the above-mentioned contact part, which further limits the axial movement of the movable core 20.
[0035] Further, the deformable section 12 includes a first part (not shown in the figure) having a first wall thickness and a second part (not shown in the figure) having a second wall thickness smaller than the first wall thickness, and the first and second parts are arranged in the axial direction. When the movable core 20 is assembled on the connecting rod 10, the inner step 21 contacts the first part. The second part with the smaller wall thickness can provide a larger deformation amount for the deformable section 12 when the inner step 21 presses the deformable section 12; and the first part with the larger wall thickness has stronger structural strength, avoiding damage due to long-time pressing by the inner step 21.
[0036] Further, the limiting section 13 of the core end 1 is provided with a plurality of ribs 15 extending along the axial line Y and protruding radially outward. When the movable core 20 is assembled on the connecting rod 10, the ribs 15 press against the wall of the inner cavity, so as to further increase the static friction between the connecting rod 10 and the movable core 20.
[0037] Referring to Figure 3 and Figure 4 It shows that the micro electromagnetic pump 100 is provided with the connecting rod assembly as described above, and further comprises a shell 3, a fixed core 4 fixedly arranged in the shell 3, a working component 6 movably arranged in the shell 4, an excitation assembly for generating a magnetic field, and a return spring 7.
[0038] The excitation assembly comprises a bracket 51 fixedly installed in the shell 3 and an excitation winding 52 wound on the bracket 51. The bracket 51 is provided with an axially-through channel (not labeled in the figure), which forms a sliding fit with the connecting rod 10 to limit the moving direction of the connecting rod 10.
[0039] The fixed core 4 and the movable core 20 are both made of soft magnetic material and are arranged in axial opposition. The return spring 7 contacts and applies a return force to the movable core 20. When the excitation winding 52 is energized, the excitation winding 52 generates a magnetic field, the fixed core 4 and the movable core 20 are magnetized, and the movable core 20 overcomes the elastic force of the return spring 7 and moves towards the fixed core 4 under the attraction of the fixed core 4; when the excitation winding 52 is de-energized, the fixed core 4 and the movable core 20 lose magnetism, and the movable core 20 returns to the elastic force of the return spring 7 and moves away from the fixed core 4. Thus, by applying a periodic current to the excitation winding 52, the movable core 20 can be driven to reciprocate with the connecting rod 10.
[0040] The shell 3 is formed with a fluid path (not shown in the figure) for fluid to flow into and out of the micro electromagnetic pump 100, which is located in a pump water cavity 31 inside the shell 3. The working component 6 of the micro electromagnetic pump 100 is arranged outside the pump water cavity 31 and connected to the connecting end 17 of the connecting rod 10. When a periodic current is applied to the excitation winding 52, the working component 6 is driven to reciprocate by the connecting rod 10, thereby forming a periodic negative pressure and positive pressure at the pump water cavity 31, so that the micro electromagnetic pump 100 can continuously suck in and pump out fluid.
[0041] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made in accordance with the spirit of the present application shall be covered within the protection scope of the present application.
Claims
1. A linkage assembly adapted for use in a micro electromagnetic pump / micro electromagnetic valve having a movable working member, characterized in that, The connecting rod assembly comprises a connecting rod and a movable core which can be assembled and disassembled with the connecting rod in an axial direction; the connecting rod has a core end and a connecting end which are away from each other in the axial direction, the connecting end is configured to be suitable for connecting the working part, the core end comprises a deformable section which can be deformed in a radial direction and a limiting section which is located inside the deformable section, the deformable section is provided with a waist-shaped hole which extends in the axial direction, and the limiting section has a limiting surface which can limit the movable core in the axial direction; the movable core has an inner cavity through which the connecting rod passes and an inner step which extends to the inner cavity, the inner step has a minimum inner diameter of the movable core, and when the movable core is assembled on the connecting rod, the inner step presses against the deformable section and makes the deformable section be deformed in the radial direction.
2. The link assembly of claim 1, wherein, When viewed in the horizontal direction, the contact position of the inner step and the deformable section is located inside the waist-shaped hole.
3. The link assembly of claim 1, wherein, The limiting section is provided with a plurality of radial protruding ribs, and when the movable core is installed on the connecting rod, the plurality of ribs press against the wall surface of the inner cavity.
4. The link assembly of claim 1, wherein, The inner step is close to or located at one side end of the core.
5. The link assembly of any one of claims 1-4, wherein, The core end further comprises a rigid section, and the rigid section, the deformable section and the limiting section are sequentially arranged in the axial direction.
6. The link assembly of any one of claims 1-4, wherein, The deformable section comprises a first part which has a first wall thickness and a second part which has a second wall thickness which is smaller than the first wall thickness, and when the movable core is assembled on the connecting rod, the wall surface of the inner cavity presses against the first part.
7. A micro electromagnetic pump comprising the linkage assembly of any one of claims 1-6, wherein, Further comprising a shell, a working part which is movably arranged in the shell, a fixed core which is fixedly arranged in the shell, an excitation assembly which is fixedly arranged in the shell and a return spring, the excitation assembly can generate a magnetic field for magnetizing the fixed core and the movable core, and the return spring contacts the movable core to apply a force for returning the movable core.