Dead-volume-free plastic injection module and liquid leakage detection system
By using dead volume plastic injection module and liquid leakage detection system in the syringe pump, and using elastic seals and fiber wire sleeves, the dead volume and liquid leakage problems of the syringe pump are solved, the work efficiency and service life are improved, and replacement is reduced frequency.
Patent Information
- Application Number
- CN202420906224.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-28
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-04-28
AI Technical Summary
The existing syringe pumps have dead volume problems and lack of liquid leakage detection systems, which leads to low working efficiency and short service life of the pump and requires frequent replacement.
A dead-free volume plastic injection module is designed, using elastic seals and a piston assembly with trapezoidal structure, combined with a driving mechanism and a liquid leakage detection system, and uses a fiber cable sleeve to absorb liquid leakage and trigger a reminder.
The syringe pump head with no dead volume is realized, which extends the service life, and the pump head is damaged in advance through the liquid leakage detection system, reducing replacement costs.
Smart Images
Figure CN222276912U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of injection pumps, in particular to a dead volume-free plastic injection module and a liquid leakage detection system. Background Art
[0002] At present, the syringe pumps used in the industry are generally vertical syringe pumps or plunger pumps. However, there is dead volume in the pump head of conventional vertical syringe pumps or plunger pumps. This is because the plunger of the plunger pump cannot completely occupy the volume of the pump chamber during reciprocating motion; therefore, a certain amount of dead volume will be generated. This part of the dead volume will exist in each working cycle and cannot be discharged, which reduces the working efficiency of the pump. Therefore, there is still a problem of using standard glass syringes in the industry, but the life of glass syringes is short;
[0003] In addition, the syringe pump does not have a leakage detection system. Once leakage occurs, the entire syringe pump will be damaged and the entire syringe pump needs to be replaced. Utility Model Content
[0004] Based on this, it is necessary to provide a plastic injection module and a liquid leakage detection system that can meet the requirements of zero dead volume and long service life.
[0005] A dead volume-free plastic injection module comprises a plastic pump head, a piston assembly located inside the plastic pump head, and the piston assembly can slide inside the plastic pump head;
[0006] The piston assembly includes a push rod slidably connected to the inner side of the plastic pump head, a sealing fixing block is fixedly arranged on the upper end of the push rod, and a sealing member A is fixedly sleeved along the outer side of the sealing fixing block, and the sealing member A is an elastic member;
[0007] A piston cavity is correspondingly provided on the inner side of the plastic pump head and the sealing fixing block, and the upper end of the piston cavity has the same shape as the upper end of the sealing fixing block;
[0008] When the sealing fixing block slides along the inner side of the plastic pump head, the sealing fixing block enters the upper end of the piston cavity, and the sealing member A undergoes elastic deformation, so that no dead volume is generated between the sealing fixing block and the piston cavity at this time.
[0009] Furthermore, the dead volume-free plastic injection module also includes a driving mechanism for driving the piston assembly to move along the piston cavity in the plastic pump head.
[0010] Furthermore, the piston assembly also includes a connecting end integrally formed at the lower end of the push rod, and the connecting end is inserted into the connecting hole at the upper end of the driving mechanism to be fixed.
[0011] Furthermore, the cross-sections of the piston cavity and the upper end of the sealing fixing block are both trapezoidal structures.
[0012] Furthermore, a push rod guide block is provided at the upper end of the driving mechanism corresponding to the push rod, for limiting the movement of the push rod.
[0013] A liquid leakage detection system for a dead volume-free plastic injection module comprises a liquid leakage detector arranged in a push rod guide block, wherein a liquid leakage detection line is integrally formed at the end of the liquid leakage detector, and the liquid leakage detection line is connected to an outer driving module for detecting liquid leakage.
[0014] Furthermore, a mounting groove is provided on the inner side of the push rod guide block corresponding to the liquid leakage detector, and a groove is provided on the inner side of the push rod guide block corresponding to the liquid leakage detection line.
[0015] Technical effects and advantages of the utility model:
[0016] 1. The utility model provides a sealing fixing block and a sealing member, wherein the sealing member is an elastic member. When the sealing fixing block is pushed to the uppermost end of the piston cavity, the sealing member undergoes elastic deformation, so that there is no dead volume between the sealing fixing block and the piston cavity, thereby solving the problem of dead volume of the injection pump;
[0017] 2. The utility model is provided with a liquid leakage detector. When liquid leakage occurs, the liquid enters the installation groove in the push rod guide block, is absorbed by the fiber wire sleeve on the outside of the liquid leakage detector, and is conducted from the wire core in the fiber wire sleeve to the outside drive board, thereby reminding the staff that the injection pump is leaking. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic diagram of the cross-sectional structure of a conventional plunger pump in the prior art.
[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of a glass syringe in the prior art.
[0020] Figure 3 The figure is a schematic diagram of the exploded structure of a dead volume-free plastic injection module in the utility model.
[0021] Figure 4 The utility model is a cross-sectional structural schematic diagram of a dead volume-free plastic injection module.
[0022] Figure 5 It is a schematic diagram of the driving mechanism from a top view.
[0023] Figure 6 It is a schematic diagram of the overall structure of the liquid leakage detector.
[0024] In the figure: 10, plastic pump head; 11, piston chamber; 20, piston assembly; 21, sealing fixing block; 22, push rod; 22A, connecting end; 23, seal A; 24, O-ring; 25, piston head; 26, seal B; 30, push rod guide block; 31, leakage detection line; 32, groove; 33, leakage detector; 33A, fiber wire sleeve; 33B, wire core; 40, driving mechanism; 50, threaded head; 60, glass tube; 70, injection pump connector. DETAILED DESCRIPTION
[0025] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.
[0026] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.
[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein 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.
[0028] The utility model relates to a dead volume-free plastic injection module, comprising a plastic pump head 10, a piston assembly 20 located inside the plastic pump head 10, the piston assembly 20 can slide inside the plastic pump head 10, and a driving mechanism 40 that drives the piston assembly 20 to move up and down;
[0029] like Figure 1The conventional plunger pump used in the prior art shown in the figure also includes a plastic pump head 10, a push rod 22 is slidably connected to the inner side of the plastic pump head 10, a seal B26 is fixedly sleeved along the outer side of the push rod 22, and an O-ring 24 is arranged above the seal B26, wherein a piston cavity 11 is also opened on the inner side of the plastic pump head 10 corresponding to the push rod 22, and the push rod 22 can be driven by a transmission mechanism to reciprocate up and down along the piston cavity 11 in the plastic pump head 10 to suck and discharge liquid, so that only dead volume injection can be achieved, which will limit some application scenarios;
[0030] Another example Figure 2 The glass syringe used in the prior art shown in the figure comprises a glass tube 60, a push rod 22 is movably connected to the inner side of the glass tube 60, a piston head 25 is also engaged at the upper end of the push rod 22, an O-ring 24 is also arranged between the piston head 25 and the push rod 22, the lower end of the push rod 22 is fixedly connected to the transmission mechanism, a threaded head 50 is also engaged at the upper end of the glass tube 60, and is used for threaded connection with the syringe pump connector 70, the piston head 25 is driven by the transmission mechanism to reciprocate in the inner cavity of the glass tube 60 to suck and discharge liquid, and realize dead volume-free injection, however, the glass syringe has a short life and needs to be replaced regularly, so the use cost is relatively high;
[0031] To this end, a method was designed Figure 3-4 The plastic injection module without dead volume shown in the figure, wherein the piston assembly 20 includes a push rod 22, the upper end of which is engaged with a sealing fixing block 21, and a sealing member A23 is fixedly sleeved along the outer side of the sealing fixing block 21, and the inner wall of the piston cavity 11 of the plastic pump head 10 cooperates with the outer wall of the sealing member A23 to form a sealed cavity body, and since the sealing member A23 itself is an elastic structure, and the upper end cross-sections of the piston cavity 11 and the sealing fixing block 21 are both trapezoidal structures, when the sealing fixing block 21 moves to the uppermost end of the piston cavity 11, the sealing member A23 is deformed at this time, that is, the sealing fixing block 21 has sufficient upper and lower margins to allow the sealing member A23 to be elastically deformed, thereby ensuring sealing while solving the problem of dead volume;
[0032] like Figure 5 As shown, a push rod guide block 30 is also provided at the connection between the driving mechanism 40 and the plastic pump head 10, which is fixedly connected along the outer side of the lower end of the push rod 22, so that the plastic pump head 10 and the push rod 22 can be accurately matched and positioned, thereby ensuring the concentricity of the injection module, so that the injection module can still ensure reliable sealing of the pump head cavity after long-term reciprocating motion wear, such as Figure 3-4 As shown, the lower end of the push rod 22 is also integrally formed with a connecting end 22A, and the push rod 22 is fixedly connected to the driving mechanism 40 through the connecting end 22A. The driving mechanism 40 drives the push rod 22, so that the sealing member A23 reciprocates in the piston cavity 11 of the plastic pump head 10. This design has the advantages of low cost to replace the existing glass syringes without dead volume, and has a long service life;
[0033] like Figure 3-5 As shown, a liquid leakage detection system includes a liquid leakage detector 33 arranged on the inner side of a push rod guide block 30, wherein one end of the liquid leakage detector 33 is also integrally connected with a liquid leakage detection line 31, and a groove 32 is also provided along the inner side of the push rod guide block 30 corresponding to the liquid leakage detection line 31;
[0034] like Figure 6 As shown, a method for using a liquid leakage detection system, the steps are as follows;
[0035] S1. Peel off the wire sheaths at one end of the two copper wires to expose the wire core 33B, and then completely wrap the outer side of the exposed wire core 33B with a functional fiber wire sheath 33A;
[0036] S2, then wrap the two copper wires around the part Figure 6 As shown, they are intertwined with each other, and are not connected to each other because they are wrapped with fiber cloth 33A, and finally they are wound into a circle and installed in the middle installation groove of the push rod guide block 30;
[0037] S3, the parts of the two copper wires not wrapped by the fiber wire sleeve 33A are first extended from the groove 32 of the push rod guide block 30, and then embedded in the corresponding interface of the driving module, so that the user can connect the leakage detection line 31 to the driving board on the outside;
[0038] S4. When the piston chamber 11 and the seal A23 of the plastic pump head 10 are worn and fail, the liquid leaks into the installation groove of the leakage detector 33 arranged in the push rod guide block 30 under the pump head. The fiber wire sleeve 33A on the outside of the leakage detector 33 absorbs the liquid, and then the fiber wire sleeve 33A that absorbs the liquid is conducted along the inner wire core 33B to the drive module connected to the outside, thereby triggering the leakage reminder set in the whole system, reminding the user to replace the corresponding parts.
[0039] 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.
[0040] The above-mentioned embodiments only express several embodiments of the present utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present 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 present utility model, which all belong to the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be based on the attached claims.
Claims
1. A dead volume-free plastic injection module, characterized in that: It comprises a plastic pump head (10), and a piston assembly (20) located inside the plastic pump head (10), wherein the piston assembly (20) can slide inside the plastic pump head (10); The piston assembly (20) comprises a push rod (22) slidably connected to the inner side of the plastic pump head (10), a sealing fixing block (21) is fixedly arranged on the upper end of the push rod (22), and a sealing member A (23) is fixedly sleeved along the outer side of the sealing fixing block (21), and the sealing member A (23) is an elastic member; A piston cavity (11) is correspondingly provided on the inner side of the plastic pump head (10) and the sealing fixing block (21), and the upper end of the piston cavity (11) has the same shape as the upper end of the sealing fixing block (21); When the sealing fixing block (21) slides along the inner side of the plastic pump head (10), the sealing fixing block (21) enters the upper end of the piston chamber (11), and the sealing member A (23) undergoes elastic deformation, so that no dead volume is generated between the sealing fixing block (21) and the piston chamber (11) at this time.
2. The dead volume-free plastic injection module according to claim 1, characterized in that: The dead volume-free plastic injection module further comprises a driving mechanism (40) for driving the piston assembly (20) to move along the piston cavity (11) in the plastic pump head (10).
3. The dead volume-free plastic injection module according to claim 2, characterized in that: The piston assembly (20) further comprises a connecting end (22A) integrally formed at the lower end of the push rod (22), and the connecting end (22A) is inserted into a connecting hole at the upper end of the driving mechanism (40) to be fixed.
4. The dead volume-free plastic injection module according to claim 1, characterized in that: The cross-sections of the piston chamber (11) and the upper ends of the sealing fixing block (21) are both trapezoidal structures.
5. The dead volume-free plastic injection module according to claim 2, characterized in that: A push rod guide block (30) is also provided at the upper end of the driving mechanism (40) and corresponding to the push rod (22), and is used for limiting the movement of the push rod (22).
6. A liquid leakage detection system for a dead volume-free plastic injection module according to any one of claims 1 to 5, characterized in that: The invention comprises a liquid leakage detector (33) arranged in a push rod guide block (30), wherein a liquid leakage detection line (31) is integrally formed at the end of the liquid leakage detector (33), and the liquid leakage detection line (31) is connected to an outer driving module for detecting liquid leakage.
7. The liquid leakage detection system according to claim 6, characterized in that: The push rod guide block (30) is provided with a mounting groove corresponding to the liquid leakage detector (33) and a groove (32) is provided on the inner side of the push rod guide block (30) and the liquid leakage detection line (31).