CN211715310U - Precise injection pump - Google Patents
Precise injection pump Download PDFInfo
- Publication number
- CN211715310U CN211715310U CN201922118428.7U CN201922118428U CN211715310U CN 211715310 U CN211715310 U CN 211715310U CN 201922118428 U CN201922118428 U CN 201922118428U CN 211715310 U CN211715310 U CN 211715310U
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- Prior art keywords
- pump
- piston rod
- sleeve
- pump sleeve
- injection pump
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Abstract
The utility model discloses an accurate injection pump. The injection pump is characterized by comprising a pump sleeve, a piston rod and a pump body, wherein the pump sleeve and the piston rod are integrally formed; one end of the piston rod is inserted into the pump sleeve to form a variable cavity capable of accurately quantifying with the pump sleeve, and the other end of the piston rod is connected with the pump body; the end of the piston rod close to the variable cavity is cylindrical, and the cylindrical rear end is carved, so that only part of the outer surface of the piston rod can be in contact with the pump sleeve, the contact area of the piston rod and the pump sleeve is reduced, the phenomena of adhesion and blockage caused by too large contact surface of the piston rod and the pump sleeve can be effectively prevented, and the failure rate of the precision injection pump is reduced. The utility model discloses a sealed mode can effectively solve the problem that accurate syringe pump took place bonding, card pause when getting volume solution, has improved the practicality of accurate syringe pump.
Description
Technical Field
The utility model relates to a sealing mode between piston rod and the pump housing of accurate column jet pump, concretely relates to accurate syringe pump.
Background
The injection pump is used as a relatively precise liquid taking and feeding mode, and the injection pump is often subjected to the situation of pumping strong corrosive liquid, strong acid and strong alkalinity or high-temperature liquid in the using process, so that the injection pump has high requirements on the material of a pump body. In addition, in the using process, due to repeated pushing and pulling of the pump, the movable surface of the pump is easy to generate scratches and even liquid leakage, which greatly affects the precision and the service life of the injection pump, so the sealing mode of the movable surface of the injection pump is also a crucial factor affecting the quality of the injection pump.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an accurate syringe pump prevents that it from taking place the phenomenon of card pause in the use.
In order to achieve the above purpose, the utility model provides an accurate injection pump, which is characterized in that the injection pump comprises a pump sleeve, a piston rod and a pump body, wherein the pump sleeve and the piston rod are all integrally formed; one end of the piston rod is inserted into the pump sleeve to form a variable cavity capable of accurately quantifying with the pump sleeve, and the other end of the piston rod is connected with the pump body; the end of the piston rod close to the variable cavity is cylindrical, and the cylindrical rear end is carved, so that only part of the outer surface of the piston rod can be in contact with the pump sleeve, the contact area of the piston rod and the pump sleeve is reduced, the phenomena of adhesion and blockage caused by too large contact surface of the piston rod and the pump sleeve can be effectively prevented, and the failure rate of the precision injection pump is reduced.
Furthermore, the piston rod and the pump sleeve can be made of any hard material which can be integrally formed.
Furthermore, the contact surface of the piston rod and the pump sleeve is rigid seal.
Furthermore, concave structures are uniformly distributed on the surface of the piston rod subjected to engraving treatment, and the parts which are not concave are still in contact with the pump sleeve, so that the guiding effect or the sealing effect of the piston rod is increased.
Further, the piston rod may be of any configuration that reduces the area of the piston rod in contact with the pump housing.
Drawings
FIG. 1 is a schematic structural view of a middle precision injection pump of the present invention;
FIG. 2 is a schematic view of the single thread configuration of the piston rod of FIG. 1;
FIG. 3 is a schematic view of the double thread configuration of the piston rod of FIG. 1;
fig. 4 is a schematic view of the annular configuration of the piston rod of fig. 1.
In the figure, 1-pump sleeve, 2-piston rod, 3-pump body, 4-cylinder, 5-concave structure and 6-guide surface.
Detailed Description
The precise injection pump of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, a precision injection pump is characterized in that the injection pump comprises a pump sleeve 1, a piston rod 2 and a pump body 3, wherein the pump sleeve and the piston rod are integrally molded; one end of the piston rod is inserted into the pump sleeve to form a variable cavity capable of accurately quantifying with the pump sleeve, and the other end of the piston rod is connected with the pump body; one end of the piston rod, which is close to the variable cavity, is cylindrical 4, and the cylindrical rear end of the piston rod is subjected to engraving treatment, so that only part of the outer surface of the piston rod can be in contact with the pump sleeve, the contact area between the piston rod and the pump sleeve is reduced, the phenomena of adhesion and blockage caused by too large contact surface between the piston rod and the pump sleeve can be effectively prevented, and the fault rate of the precision injection pump is reduced.
As shown in fig. 2, fig. 3, fig. 4, be the piston rod of single helical structure, double helical structure and ring structure respectively, when using the shot-pump to draw the salt solution, if the shot-pump is placed for a long time after using, then attached to the crystallization of the movable cavity inner wall of shot-pump and make the shot-pump take place the phenomenon of card pause when restarting easily, for the emergence of preventing this type of phenomenon, the utility model discloses carve the processing on the surface of piston rod, when effectively reducing the area of contact between piston rod and the pump housing, the front end cylinder part that the piston rod was not carved and is handled plays sealed effect, and the non-recessed part in rear end plays direction or sealing effect for the piston rod does not take place the skew or strengthens sealed effect at the in-process that removes. When the double-spiral structure in fig. 2 or the circular ring structure in fig. 4 is used, the back end carving part of the piston rod has the functions of guiding and sealing while reducing the contact surface; when the single spiral structure in fig. 3 is selected for use, the engraved portion at the rear end of the piston rod has only a contact surface reducing and guiding function, and has no sealing effect, and a structure that enables the engraved portion to be selected according to process requirements is used.
Claims (5)
1. A precise injection pump is characterized in that the injection pump comprises a pump sleeve, a piston rod and a pump body, wherein the pump sleeve and the piston rod are integrally formed; one end of the piston rod is inserted into the pump sleeve to form a variable cavity capable of accurately quantifying with the pump sleeve, and the other end of the piston rod is connected with the pump body; the end of the piston rod close to the variable cavity is cylindrical, and the cylindrical rear end is carved, so that only part of the outer surface of the piston rod can be in contact with the pump sleeve, the contact area of the piston rod and the pump sleeve is reduced, the phenomena of adhesion and blockage caused by too large contact surface of the piston rod and the pump sleeve can be effectively prevented, and the failure rate of the precision injection pump is reduced.
2. A precision syringe pump as claimed in claim 1, wherein: the piston rod and the pump sleeve can be made of any hard material which can be integrally formed.
3. A precision syringe pump as claimed in claim 1, wherein: the contact surface of the piston rod and the pump sleeve is rigid seal.
4. A precision syringe pump as claimed in claim 1, wherein: the surface of the piston rod after engraving is uniformly distributed with concave structures, and the parts which are not concave are still contacted with the pump sleeve, so that the guiding effect or the sealing effect of the piston rod is increased.
5. A precision syringe pump according to claim 4, wherein: the piston rod may be of any configuration that reduces the contact surface area between the piston rod and the pump housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922118428.7U CN211715310U (en) | 2019-12-02 | 2019-12-02 | Precise injection pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922118428.7U CN211715310U (en) | 2019-12-02 | 2019-12-02 | Precise injection pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211715310U true CN211715310U (en) | 2020-10-20 |
Family
ID=72814557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922118428.7U Active CN211715310U (en) | 2019-12-02 | 2019-12-02 | Precise injection pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211715310U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110761990A (en) * | 2019-12-02 | 2020-02-07 | 南京纳摩尔仪器有限公司 | Sealing mode of precise column injection pump |
-
2019
- 2019-12-02 CN CN201922118428.7U patent/CN211715310U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110761990A (en) * | 2019-12-02 | 2020-02-07 | 南京纳摩尔仪器有限公司 | Sealing mode of precise column injection pump |
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