Piston

Abstract

The utility model relates to the technical field of dynamic sealing elements, and discloses a piston which comprises a main body and a plurality of first sealing parts, and the main body is provided with a first end and a second end which are opposite; the plurality of first sealing parts are sequentially arranged on the periphery of the main body at intervals from the second end to the first end of the main body; the side, facing the adjacent first sealing part, of each first sealing part is provided with a concave part which is concave towards the interior of the concave part. According to the piston disclosed by the utility model, the concave parts are arranged on the first sealing parts, and when the piston is arranged in the piston cavity, the concave parts of the first sealing parts can provide larger deformation space, so that the first sealing parts have larger deformation quantity; when the first sealing parts of the piston contract due to the influence of low temperature or are abraded after long-term reciprocating motion, the first sealing parts can more smoothly compensate the contraction or abrasion of the first sealing parts in a deformation recovery mode, and therefore the first sealing parts can still form reliable sealing with the piston cavity.

Description

Technical Field

[0001] The utility model relates to the technical field of dynamic sealing elements, and more particularly, to a piston. Background Art

[0002] The content of this part only provides background information related to the utility model, which may not constitute prior art.

[0003] As a common dynamic sealing element, the piston is widely used in injection pump products. Briefly speaking, the sealing function of the piston is realized by the friction between the sealing part provided on the outer periphery of the piston and the piston cavity.

[0004] In the related art, the known pistons are generally made of materials such as PTEE, and the sealing part of the piston is generally annular and solid. For such pistons, since the sealing part is solid, the deformation amount (which can also be understood as the compression amount) of the sealing part in the piston cavity is small. At the same time, it is found through practice that the sealing part of the piston is susceptible to shrinkage under low temperature or wear after long-term reciprocating motion. In either case, the friction between the sealing part of the piston and the piston cavity will be reduced or even disappear (that is, the sealing part is separated from the piston cavity), thereby reducing the sealing effect or even causing sealing failure. Summary of the Utility Model

[0005] In view of this, the purpose of the utility model is to provide a piston, hoping to increase the deformation amount of the sealing part of the piston in the piston cavity, so that when the sealing part is in a low-temperature environment or wears, the sealing part can still form a reliable seal with the piston cavity through compensation.

[0006] The purpose of the utility model is achieved by the following technical solutions:

[0007] The utility model discloses a piston, comprising:

[0008] A main body having opposite first and second ends;

[0009] A plurality of first sealing parts, the plurality of first sealing parts are sequentially arranged at intervals on the outer periphery of the main body from the second end to the first end of the main body; on one side of each first sealing part facing the adjacent first sealing part, there is a recessed part recessed towards its own interior.

[0010] Further, the recessed part has an arc-shaped structure.

[0011] Further, the first sealing parts are closed after extending along the circumferential direction of the main body, and the recessed parts are closed after extending along the circumferential direction of the main body.

[0012] Further, the piston further includes:

[0013] A second sealing portion disposed at the second end of the main body; the second sealing portion extends circumferentially along the main body and then closes, and the second sealing portion is a solid structure.

[0014] Further, the main body, the plurality of first sealing portions and the second sealing portion are integrally formed.

[0015] Further, a convex portion is provided at the second end of the main body, and the convex portion extends in the axial direction of the main body away from the first end of the main body.

[0016] Further, the convex portion is conical.

[0017] Further, the main body, the plurality of first sealing portions and the convex portion are integrally formed.

[0018] Further, a plugging groove extending towards the second end is provided at the first end of the main body.

[0019] Further, the piston is made of PTEE material.

[0020] The technical solution of the embodiment of the present utility model has at least the following advantages and beneficial effects:

[0021] In the piston disclosed in the present utility model, by providing a recess on each first sealing portion, when the piston is placed in the piston cavity, the recess of the first sealing portion can provide a larger deformation space, so that each first sealing portion has a larger deformation amount. On this basis, when the first sealing portion of the piston shrinks due to the influence of low temperature or wears after long-term reciprocating movement, each first sealing portion can more smoothly compensate for its own shrinkage or wear by restoring deformation, so that each first sealing portion can still form a reliable seal with the piston cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of a piston provided by an embodiment of the present utility model;

[0023] Figure 2 is Figure 1 a cross-sectional view of the piston shown in

[0024] Figure 3 is for Figure 1 a schematic structural diagram when the piston shown in

[0025] Figure 4 is for Figure 1 a cross-sectional view when the piston shown in

[0026] Icon: 10 - Main body, 11 - First end, 12 - Second end, 13 - Insertion slot, 20 - Protrusion, 30 - First sealing part, 31 - Depression, 40 - Second sealing part, 50 - Driving member, 60 - Sealing member. Detailed implementation

[0027] To make the objectives, technical solutions, and advantages of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below in conjunction with the detailed implementation. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are some embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present utility model without creative work fall within the scope of protection of the present utility model.

[0028] Compared with the embodiments shown in the drawings, the feasible implementation solutions within the scope of protection of the present utility model may have fewer components, have other components not shown in the drawings, different components, components arranged differently, or components connected differently, etc. In addition, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0029] An embodiment of the present utility model discloses a piston, which can especially be a piston applicable to injection pump products (such as syringes, injection pumps, etc.).

[0030] As Figure 1 and Figure 2 shown, wherein, Figure 1 shows a schematic structural view of the piston disclosed in the embodiment of the present utility model, Figure 2 shows a cross-sectional view of the piston.

[0031] In Figure 1 and Figure 2 the shown piston, the piston may include a main body 10. The main body 10 may have a generally cylindrical configuration. At the same time, the main body 10 may have opposite first end 11 and second end 12.

[0032] Among them, referring to Figure 3 and Figure 4 , the first end 11 of the main body 10 is adapted to be connected to a driving member 50 such as a piston rod, so that the piston can reciprocate in a piston cavity (not shown in the figure) under the drive of the driving member 50. For example, as Figure 2 shown, an insertion slot 13 extending towards the second end 12 may be formed at the first end 11 of the main body 10, so that a driving member 50 such as a piston rod can be inserted into the insertion slot 13 to be connected to the main body 10. And, during the actual assembly stage, a driving member 50 inserted into the insertion slot 13 is sleeved with such asFigure 4 a seal member 60 such as a sealing ring as shown, so as to improve the reliability and sealing performance after the driving member 50 is connected to the main body 10.

[0033] Referring to Figure 1 or Figure 2 , a protrusion 20 that is generally conical can be provided at the second end 12 of the main body 10, and the protrusion 20 extends along the axial direction of the main body 10 away from the first end 11 of the main body 10. Wherein, when there is a relatively small fluid inlet and outlet channel for fluid to enter and exit the piston cavity at the end of the piston cavity, the protrusion 20 can be used to block the fluid inlet and outlet channel at the end of the piston cavity.

[0034] Furthermore, the piston may further include a plurality of first sealing portions 30, and the plurality of first sealing portions 30 are sequentially and spaced apart from the second end 12 to the first end 11 of the main body 10 on the outer periphery of the main body 10. Wherein, each first sealing portion 30 can be an annular closed structure that is closed after extending circumferentially along the main body 10, and the outer diameter of the first sealing portion 30 can be slightly larger than the inner diameter of the piston cavity. Wherein, when the piston is placed in the piston cavity, the outer circumferential wall of the first sealing portion 30 on the outer periphery of the main body 10 can contact and fit with the inner wall of the piston cavity to form a seal, and each first sealing portion 30 deforms under the extrusion of the piston cavity. For example, in the drawings of the present utility model, a case where two first sealing portions 30 are provided on the outer periphery of the main body 10 is shown. Of course, in other embodiments of the present utility model, the first sealing portion 30 may also have other numbers.

[0035] On this basis, in order to increase the deformation amount of each first sealing portion 30 when it is in the piston cavity, in combination with Figure 1 and Figure 2 as shown, a concave portion 31 that is recessed toward the inside of itself is provided on one side of each first sealing portion 30 facing the adjacent first sealing portion 30. For example, in the case where two first sealing portions 30 are shown in the drawings, a concave portion 31 that is recessed toward the inside of itself is provided on one side of the upper first sealing portion 30 facing the lower first sealing portion 30. Correspondingly, a concave portion 31 that is recessed toward the inside of itself is also provided on one side of the lower first sealing portion 30 facing the upper first sealing portion 30. Wherein, the concave portion 31 can be in the form of a groove.

[0036] It can be understood that by providing the recessed portions 31 on each of the first sealing portions 30, when the piston is placed in the piston cavity, the recessed portions 31 of the first sealing portions 30 can provide a larger deformation space, so that each of the first sealing portions 30 can have a larger deformation amount under the extrusion of the piston cavity. On this basis, when the first sealing portions 30 of the piston shrink due to the influence of low temperature or are worn after long-term reciprocating movement, each of the first sealing portions 30 can more smoothly compensate for its own shrinkage or wear by restoring deformation, so that each of the first sealing portions 30 can still form a reliable seal with the piston cavity. Moreover, the present utility model only improves the structure of the first sealing portion 30 and does not change the overall structure of the piston. Therefore, the piston can be assembled into the piston cavity in the same manner as the known pistons in the prior art without adding additional assembly steps.

[0037] Among them, as Figure 2 shown, the recessed portions 31 on each of the first sealing portions 30 can be in an arc structure, which is convenient for the processing of the recessed portions 31 and is conducive to the deformation of each of the first sealing portions 30 more smoothly and the service life of each of the first sealing portions 30 is improved. At the same time, the recessed portions 31 on each of the first sealing portions 30 can be a ring-shaped closed structure that is closed after extending along the circumferential direction of the main body 10, so that the deformation of each region of the first sealing portion 30 is more uniform.

[0038] Continue to refer to Figure 1 or Figure 2 shown, the piston may further include a second sealing portion 40 provided at the second end 12 of the main body 10. Among them, the second sealing portion 40 can be a ring-shaped closed structure that is closed after extending along the circumferential direction of the main body 10, and the second sealing portion 40 is a solid structure. Moreover, the second sealing portion 40 is spaced apart from the first sealing portion 30 close to the second end 12 of the main body 10. It can be understood that by providing the second sealing portion 40, on the one hand, the sealing performance when the piston is placed in the piston cavity can be further improved, and on the other hand, it helps to ensure that the structural strength of the entire piston is not affected by the recessed portions 31 on the first sealing portion 30, thereby being conducive to ensuring the service life of the piston.

[0039] Among them, the main body 10, the convex portion 20, the first sealing portion 30, and the second sealing portion 40 can be integrally formed structures, which is convenient for the processing and manufacturing of the piston. Among them, the piston can be made of PTEE material, but is not limited thereto.

[0040] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A piston, characterized in that, Comprising: A main body having opposite first and second ends; A plurality of first sealing portions, the plurality of first sealing portions being sequentially and spaced apart from the second end to the first end of the main body on the outer periphery of the main body; on one side of each first sealing portion facing the adjacent first sealing portion, there is a recessed portion recessed into its own interior.

2. The piston according to claim 1, wherein The recessed portion has an arc-shaped structure.

3. The piston according to claim 1 or 2, characterized in that, The first sealing portion closes after extending along the circumferential direction of the main body, and the recessed portion closes after extending along the circumferential direction of the main body.

4. The piston according to claim 1, characterized in that, Further comprising: A second sealing portion provided at the second end of the main body; The second sealing portion closes after extending along the circumferential direction of the main body, and the second sealing portion is a solid structure.

5. The piston according to claim 4, characterized in that, The main body, the plurality of first sealing portions, and the second sealing portion are integrally formed.

6. The piston according to claim 1, wherein A convex portion is provided at the second end of the main body, and the convex portion extends axially along the main body in a direction away from the first end of the main body.

7. The piston according to claim 6, wherein, The convex portion is conical.

8. The piston according to claim 6, characterized in that, The main body, the plurality of first sealing portions, and the convex portion are integrally formed.

9. The piston according to claim 1, wherein, A plugging groove extending towards the second end is formed at the first end of the main body.

10. The piston according to claim 1, characterized in that, The piston is made of PTEE material.

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