Anti-falling and anti-rotating structure for piston rod of metering pump

Abstract

The utility model relates to the technical field of metering pump pistons, in particular to a metering pump piston rod anti-falling and anti-rotating structure which comprises a piston rod body and a piston tail handle, and a cutting face is arranged at the inserting end of the piston rod body. A sealing ring is arranged in a groove in the inner wall of the piston tail handle and provided with an adaptive tangent plane flush with the cut-off plane. A plurality of impregnation holes, a sealing ring and a machine screw are formed in an original piston tail handle, the plurality of impregnation holes can be filled with glue, so that the contact area between the glue and the piston tail handle is increased, and the adhesiveness is improved; the contact area of the piston rod body and the piston tail handle can be increased by being matched with filling of glue, the connection stability is improved, after connection is completed, the cut-off face arranged on the piston rod body is squeezed through the machine-meter screw, and therefore the connection stability of the piston rod body and the piston tail handle is further enhanced, and the falling-off probability is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of metering pump piston technology, specifically to a metering pump piston rod anti-disengagement and anti-rotation structure. Background Technology

[0002] Currently, common plunger pumps generally consist of components such as a stepper motor, lead screw pair, pump body, piston rod, seals, and pump head. Due to differences in application scenarios, the liquid sampling speed and accuracy vary greatly. In conventional fields such as chemiluminescence and environmental water treatment, the requirements for pump operating speed and sampling accuracy are not high. However, in the field of flow cytometry, there are higher requirements for the sampling accuracy and stability of the pump.

[0003] The existing metering pump piston rod consists of a piston rod body and a piston tail shank. During assembly, glue is filled into the grooves of the piston rod body and the piston tail shank, and then the piston rod body is installed into the piston tail shank. After the glue solidifies, the assembly is complete. However, after long-term use or if the glue application is not properly controlled, the piston rod body is prone to detachment, which can lead to pump damage. The stability of the assembly cannot be effectively guaranteed, posing a safety hazard to the equipment and thus having shortcomings.

[0004] Therefore, we propose a piston rod anti-detachment and anti-rotation structure for metering pumps. Utility Model Content

[0005] One of the technical problems this application aims to solve is that the existing piston rod and piston tailstock assembly method is prone to piston rod detachment after long-term use or when glue application is not properly controlled, which can lead to pump damage and pose a safety hazard.

[0006] To address the aforementioned technical problems, this application provides a structure for preventing the piston rod of a metering pump from detaching and rotating, comprising a piston rod body and a piston tail shank. A cut-off surface is provided at the insertion end of the piston rod body; a sealing ring is provided in a groove on the inner wall of the piston tail shank, and the sealing ring has an adapting cut surface flush with the cut-off surface; multiple evenly distributed dispensing holes are provided on the sealing ring; a threaded hole communicating with the insertion cavity of the piston tail shank is provided on the piston tail shank, and a grating screw is screwed into the threaded hole. When the piston rod body is inserted into the piston tail shank, the threaded hole is horizontally aligned with the cut-off surface, and the grating screw is pressed against the cut-off surface.

[0007] In some embodiments, a positioning hole is provided on the sealing ring, and the positioning hole is offset from the adapter section.

[0008] In some embodiments, a glue inlet hole is provided on the piston tail shank, and an auxiliary rod is inserted in the glue inlet hole, the auxiliary rod being adapted to the positioning hole.

[0009] In some embodiments, the inner ring of the sealing ring is an arc-shaped outward convex shape that matches the groove on the surface of the piston rod insertion portion, and the outer ring of the sealing ring is a recessed shape that protrudes into the inner ring, with the plurality of adhesive outlet holes located in the recessed area.

[0010] In some embodiments, a plurality of impregnation holes are provided on the inner bottom surface of the piston tailstock.

[0011] In some embodiments, a positioning groove is provided on the inner bottom surface of the piston tailstock, the positioning groove being located between a plurality of impregnation holes, and a positioning element is provided at the bottom of the piston rod, the positioning element including a positioning block adapted to the positioning groove.

[0012] In some embodiments, the positioning element includes a positioning block adapted to the positioning groove, and an impregnated groove uniformly disposed on the positioning block, wherein a chamfer is provided on the edge of the positioning block.

[0013] This utility model has at least the following beneficial effects:

[0014] 1. By setting multiple glue-impregnation holes in the original piston tailstock, and installing sealing rings and grommets, the multiple glue-impregnation holes can be filled with glue, thereby increasing the contact area between the glue and the piston tailstock, thus improving adhesion. The sealing ring is snapped into the original outer wall groove of the piston rod body, and with the filling of glue, the contact area between the piston rod body and the piston tailstock can be increased, improving connection stability. After the connection is completed, the cutting surface set on the piston rod body is squeezed by the grommets, thereby further enhancing the connection stability of the two and greatly reducing the probability of detachment.

[0015] 2. The positioning groove and positioning block facilitate quick positioning during piston rod installation, assisting workers in assembling the piston rod and piston tail handle, thus simplifying assembly and improving practicality. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the piston rod in this utility model;

[0018] Figure 3 for Figure 2 Enlarged structural diagram at point A in the diagram;

[0019] Figure 4 A schematic diagram showing the separation of a portion of the piston tailstock.

[0020] Figure 5 for Figure 4 Schematic diagram of the separation structure of the middle sealing ring;

[0021] Figure 6 This is a three-dimensional structural diagram of the piston rod in this utility model;

[0022] Figure 7 for Figure 6 A magnified structural diagram at point B in the diagram.

[0023] In the diagram: 1. Piston rod body; 2. Piston tail shank; 3. Measuring screw; 4. Auxiliary rod; 5. Cut-off surface; 6. Positioning component; 61. Positioning block; 62. Glue-impregnating groove; 63. Chamfer; 7. Threaded hole; 8. Positioning groove; 9. Sealing ring; 10. Glue-impregnating hole; 11. Positioning hole; 12. Glue outlet hole; 13. Adaptive cut surface; 14. Glue inlet hole. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1:

[0026] See also Figures 1-5 The technical solution provided by this utility model is as follows: a piston rod anti-disengagement and anti-rotation structure for a metering pump piston rod, including a piston rod body 1 and a piston tail shank 2. A cut surface 5 is provided at the insertion end of the piston rod body 1. A sealing ring 9 is provided in the groove of the inner wall of the piston tail shank 2. The sealing ring 9 is made of rubber and has elasticity. An adaptable cut surface 13 flush with the cut surface 5 is provided on the sealing ring 9. Multiple evenly distributed glue outlet holes 12 are provided on the sealing ring 9. A threaded hole 7 communicating with the insertion cavity of the piston tail shank 2 is provided on the piston tail shank 2. A grating screw 3 is screwed into the threaded hole 7. When the piston rod body 1 is inserted into the piston tail shank 2, the threaded hole 7 is horizontally aligned with the cut surface 5, and the grating screw 3 is pressed against the cut surface 5. The inner ring of the sealing ring 9 is an arc-shaped outward convex shape that adapts to the groove on the surface of the insertion part of the piston rod body 1. The outer ring of the sealing ring 9 is a concave shape that protrudes into the inner ring. Multiple glue outlet holes 12 are located in the concave area.

[0027] In this embodiment, as Figures 1 to 5 As shown, during assembly, inject glue into the inner bottom surface of the piston tail handle 2 to distribute the glue evenly, align the side of the piston rod 1 with the cut surface 5 with the threaded hole 7 and insert it into the piston tail handle 2. After the piston rod 1 is inserted to contact the inner bottom surface of the piston tail handle 2, tighten the nut screw 3 to fix it.

[0028] In this embodiment, as Figure 3 and Figure 5 As shown, a positioning hole 11 is provided on the sealing ring 9. The positioning hole 11 is offset from the fitting surface 13. A glue inlet hole 14 is provided on the piston tail handle 2. An auxiliary rod 4 is inserted in the glue inlet hole 14. The auxiliary rod 4 is also adapted to the positioning hole 11. When installing the sealing ring 9, glue is evenly applied to its outer ring edge. Then, the side of the sealing ring 9 with the positioning hole 11 is aligned with the glue inlet hole 14 and placed into the groove. The auxiliary rod 4 is inserted for correction. When the auxiliary rod 4 can be inserted into the interior of the piston tail handle 2, the installation is complete. After the glue solidifies, the auxiliary rod 4 is pulled out.

[0029] In this embodiment, as Figure 4 As shown, multiple glue-impregnation holes 10 are provided on the inner bottom surface of the piston tail handle 2. When glue is added into the piston tail handle 2, the multiple glue-impregnation holes 10 are filled with glue. After the piston rod body 1 is inserted and installed, this part of the glue will bond with it. When the glue solidifies, because there is glue in the multiple glue-impregnation holes 10, the contact area of ​​the glue is increased, thereby improving the bonding stability.

[0030] In this embodiment, as Figure 3 and Figure 4 As shown, a positioning groove 8 is provided on the inner bottom surface of the piston tail shank 2. The positioning groove 8 is located between multiple impregnation holes 10. A positioning component 6 is provided at the bottom of the piston rod body 1. The positioning component 6 includes a positioning block 61 that is adapted to the positioning groove 8. During installation, the positioning block 61 is aligned with the positioning groove 8 and the piston rod body 1 and piston tail shank 2 are inserted and combined. This allows the cut surface 5 on the piston rod body 1 to be precisely oriented towards the direction of the grommet 3, which facilitates subsequent pressing and fixing by the grommet 3. This setting has a positioning function, which is convenient and quick to position and has high practicality.

[0031] The implementation principle of the anti-detachment and anti-rotation structure of the metering pump piston rod in this application embodiment is as follows: When installing the sealing ring 9, apply glue evenly to the outer ring edge, then align the side of the sealing ring 9 with the positioning hole 11 with the glue inlet hole 14 and place it in the groove, and correct it by inserting the auxiliary rod 4. When the auxiliary rod 4 can be inserted into the interior of the piston tail handle 2, it indicates that the installation is complete. After the glue solidifies, pull out the auxiliary rod 4.

[0032] During assembly, glue is injected into the inner bottom surface of the piston tailstock 2 to ensure even distribution. As glue is added to the piston tailstock 2, multiple impregnation holes 10 are filled with glue, which adheres to the piston. When the glue solidifies, the increased contact area within the multiple impregnation holes 10 enhances bonding stability. This aligns the side of the piston rod 1 with the cut surface 5 with the threaded hole 7, and the positioning block 61 with the positioning groove 8 for insertion, ensuring precise insertion of the cut surface 5 on the piston rod 1. Oriented towards the direction of the grommet screw 3, this facilitates subsequent pressing and fixing via the grommet screw 3. This setting serves a positioning function, facilitating quick positioning. After the piston rod 1 is inserted to contact the inner bottom surface of the piston tail shank 2, tighten the grommet screw 3, pull out the auxiliary rod 4, and inject glue into the glue inlet hole 14. Some glue will flow from the recess of the sealing ring 9 and the groove of the piston tail shank 2, and then some glue will flow into the glue outlet hole 12 and adhere to the piston rod 1. Wait for the glue to solidify.

[0033] Example 2:

[0034] See also Figures 6-7 The technical solution provided by this utility model is as follows:

[0035] Unlike Embodiment 1, the positioning component 6 includes a positioning block 61 that matches the positioning groove 8, and an impregnated groove 62 evenly distributed on the positioning block 61. A chamfer 63 is provided on the edge of the positioning block 61. During insertion, the positioning groove 8 contains glue. When the positioning block 61 is inserted into it, some of the glue enters the impregnated groove 62, thereby increasing the connection stability between the positioning block 61 and the impregnated groove 62. The chamfer 63 reduces the size of the embedding surface, making it easier to insert and install the positioning block 61 and facilitating its use.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A piston rod anti-disengagement and anti-rotation structure for a metering pump, comprising a piston rod body (1) and a piston tail handle (2), characterized in that: A cut-off surface (5) is provided at the insertion end of the piston rod (1); A sealing ring (9) is provided in the groove on the inner wall of the piston tail shank (2), and the sealing ring (9) has a matching cut surface (13) that is flush with the cut surface (5); Multiple evenly distributed adhesive outlet holes (12) are provided on the sealing ring (9); The piston tail shank (2) has a threaded hole (7) that communicates with the insertion cavity of the piston tail shank (2). A screw (3) is screwed into the threaded hole (7). When the piston rod (1) is inserted into the piston tail shank (2), the threaded hole (7) is horizontally aligned with the cut surface (5), and the screw (3) is pressed against the cut surface (5).

2. The anti-disengagement and anti-rotation structure for the piston rod of the metering pump according to claim 1, characterized in that: A positioning hole (11) is provided on the sealing ring (9), and the positioning hole (11) is offset from the fitting surface (13).

3. The anti-detachment and anti-rotation structure for the piston rod of the metering pump according to claim 2, characterized in that: The piston tailstock (2) is provided with a glue inlet hole (14), and an auxiliary rod (4) is inserted in the glue inlet hole (14). The auxiliary rod (4) is also compatible with the positioning hole (11).

4. The anti-disengagement and anti-rotation structure for the piston rod of the metering pump according to claim 1, characterized in that: The inner ring of the sealing ring (9) is an arc-shaped outward convex shape that matches the groove on the surface of the piston rod body (1) insertion part, and the outer ring of the sealing ring (9) is a concave shape that protrudes into the inner ring. The multiple glue outlet holes (12) are located in the concave area.

5. The anti-disengagement and anti-rotation structure for the piston rod of a metering pump according to claim 1, characterized in that: Multiple impregnation holes (10) are provided on the inner bottom surface of the piston tail shank (2).

6. The anti-disengagement and anti-rotation structure for the piston rod of a metering pump according to claim 5, characterized in that: A positioning groove (8) is provided on the inner bottom surface of the piston tail shank (2). The positioning groove (8) is located between a plurality of impregnation holes (10). A positioning element (6) is provided at the bottom of the piston rod body (1). The positioning element (6) includes a positioning block (61) that is adapted to the positioning groove (8).

7. The anti-disengagement and anti-rotation structure for the piston rod of a metering pump according to claim 6, characterized in that: The positioning element (6) includes a positioning block (61) adapted to the positioning groove (8) and an impregnation groove (62) evenly arranged on the positioning block (61), and a chamfer (63) is provided on the edge of the positioning block (61).

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