CN215521458U - Pull rod type sealing auxiliary device - Google Patents
Pull rod type sealing auxiliary device Download PDFInfo
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- CN215521458U CN215521458U CN202121935594.7U CN202121935594U CN215521458U CN 215521458 U CN215521458 U CN 215521458U CN 202121935594 U CN202121935594 U CN 202121935594U CN 215521458 U CN215521458 U CN 215521458U
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- hydraulic cylinder
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- piston rod
- sealing
- end cover
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Abstract
The utility model belongs to the technical field of mechanical equipment, and provides a pull rod type sealing auxiliary device which comprises a hydraulic cylinder, wherein a through hole is formed in the hydraulic cylinder, and the upper end and the lower end of the hydraulic cylinder are respectively detachably connected with a first end cover and a second end cover through connecting rods; a piston rod is arranged on the first end cover, the piston rod extends into the hydraulic cylinder, and a piston is arranged at one end of the piston rod in the hydraulic cylinder; the hydraulic cylinder adopts the through holes with the two through ends, the processing is easy, the precision can be ensured, the end cover and the hydraulic cylinder are detachably connected through the connecting rod, the assembly difficulty is reduced, the maintenance and the replacement are easy, the production cost is reduced, and the working efficiency is improved; the sealing device is arranged on the outer side of the piston, friction between the piston and the inner wall of the hydraulic cylinder can be reduced due to the arrangement of the sealing device, so that resistance is very small when the piston and the piston rod move, and pressure change of the first hydraulic cavity can be caused due to small pressure change of the second hydraulic cavity, so that the sealing device is very sensitive and improves working precision.
Description
Technical Field
The application relates to the technical field of mechanical equipment, in particular to a pull rod type sealing auxiliary device.
Background
With the enhancement of environmental protection work, the leakage of toxic and harmful substances in industrial production is not allowed more and more, and a sealing auxiliary system is provided for better solving the leakage problem; the sealing auxiliary system is a necessary part for ensuring the normal work of the mechanical seal, and has the requirements of pressure, temperature, corrosion resistance and the like, and the performance grade of each part must exceed or be equivalent to the overall requirement of the system; in the prior art, a plurality of sealing auxiliary systems are provided, the most common sealing auxiliary device of a hydraulic cylinder is provided, the working principle of the sealing auxiliary device is very simple, namely, the pressure in a pump inlet or a reaction kettle is introduced into a second hydraulic cavity by utilizing the action area differential pressure of a first hydraulic cavity and a second hydraulic cavity in a rod hydraulic cylinder according to the pressure balance principle, so that the liquid sealing of the first hydraulic cavity obtains higher pressure, and the auxiliary sealing effect is achieved; however, the sealing assistance device in the prior art has the following problems:
1. one end of the hydraulic cylinder is sealed, the blind hole is difficult to process, and the precision cannot be guaranteed;
2. the assembly difficulty is high, and the maintenance and the replacement are very inconvenient;
3. the production cost is high.
Therefore, a new technical solution is needed to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
The application provides a pull rod type sealing auxiliary device which comprises a hydraulic cylinder, wherein a through hole is formed in the hydraulic cylinder, and the upper end and the lower end of the hydraulic cylinder are respectively detachably connected with a first end cover and a second end cover through connecting rods; and a piston rod is arranged on the first end cover, the piston rod extends into the hydraulic cylinder, and a piston is arranged at one end of the piston rod in the hydraulic cylinder.
As a preferred scheme, mounting holes are formed in the first end cover and the second end cover, the mounting holes are penetrated through two ends of the connecting rod, and the two ends of the connecting rod are connected through locking nuts.
Preferably, a sealing device is arranged on the outer side of the piston.
Preferably, the sealing means comprises a first sealing means and a second sealing means.
Preferably, the first sealing device is arranged at the upper end and the lower end of the outer side of the piston, and the first sealing device adopts a V-shaped hard sealing ring.
Preferably, the second sealing device is arranged between the first sealing devices, and the second sealing device adopts a wear-resistant ring.
Preferably, the outer side of the piston rod is provided with a GUS coating.
Preferably, the surface hardness of the piston rod is greater than or equal to HRC 60.
As a preferred scheme, the hydraulic cylinder adopts a seamless stainless steel pipe, and the through holes are equal-diameter through holes.
Preferably, a portion of the end cap contacting the piston rod is provided with a third sealing means.
Due to the adoption of the technical scheme, compared with the prior art, the pull rod type sealing auxiliary device has the advantages that the hydraulic cylinder adopts the through hole with the through ends, the processing is easy, the precision can be ensured, the end cover and the hydraulic cylinder are detachably connected through the connecting rod, the assembly difficulty is reduced, the maintenance and the replacement are easy, the production cost is reduced, and the working efficiency is improved; in addition, the GUS coating is arranged on the outer side of the piston rod, so that the hardness of the piston rod can be improved, the service life of the piston rod is prolonged, the resistance is very small, and the pressure change of the first hydraulic cavity can be caused by the small pressure change of the second hydraulic cavity, so that the piston rod is very sensitive; in conclusion, the utility model has the advantages of simple structure, high precision, convenient disassembly and maintenance, low production cost and high processing efficiency.
Drawings
FIG. 1 is a schematic structural diagram of the present application;
FIG. 2 is a cross-sectional view of FIG. 1;
reference numerals:
1. hydraulic cylinder 2, through hole 3, connecting rod 4 and end cover I
5. End cover II 6, locking nut 7, piston rod 8 and piston
9. First hydraulic cavity 10, second hydraulic cavity 11 and first sealing device
12. A second sealing device 13 and a third sealing device.
Detailed Description
The following describes in detail a specific embodiment of the present invention with reference to fig. 1 and 2. It should be noted that the specific embodiments described herein are only for illustrating and explaining the present invention and are not to be construed as limiting the present invention.
The first embodiment is as follows:
the application provides a pull rod type sealing auxiliary device which comprises a hydraulic cylinder 1, wherein a through hole 2 is formed in the hydraulic cylinder 1, and the upper end and the lower end of the hydraulic cylinder 1 are respectively detachably connected with a first end cover 4 and a second end cover 5 through a connecting rod 3; the connecting rod 3 adopts a double-end stud; mounting holes are formed in the first end cover 4 and the second end cover 5, two ends of the connecting rod 3 penetrate through the mounting holes, locking nuts 6 are mounted at two ends of the connecting rod 3, and the hydraulic cylinder 1 is connected with the first end cover 4, the hydraulic cylinder 1 is connected with the second end cover 5 through the matching of the connecting rod 3 and the locking nuts 6; two ends of the connecting rod 3 are provided with external threads matched with the internal threads of the locking nut 6; a piston rod 7 is arranged on the first end cover 4, one end of the piston rod 7 is arranged in the pupil 2 of the hydraulic cylinder 1, the other end of the piston rod 7 is arranged on the outer side of the hydraulic cylinder 1, and a piston 8 is arranged at one end of the piston rod 7 in the hydraulic cylinder 1; the piston 8 can reciprocate up and down in the hydraulic cylinder 1, namely the piston rod 7 reciprocates up and down along the end cover I4, the upper end of the piston 8 is a first hydraulic cavity 9, the first hydraulic cavity 9 is a rod cavity, the lower end of the piston 8 is a second hydraulic cavity 10, the second hydraulic cavity 10 is a rodless cavity, by utilizing the action area differential pressure of the first hydraulic cavity 9 and the second hydraulic cavity 10 in the rod hydraulic cylinder, the second hydraulic cavity 10 is led into the pressure at the inlet of the pump or in the reaction kettle according to the pressure balance principle, so that the liquid sealing of the first hydraulic cavity 9 obtains higher pressure, and the auxiliary sealing effect is achieved; the connecting rod 3, the locking nut 6, the first end cover 4 and the second end cover 5 are matched and detachably connected, so that the assembly difficulty is reduced, the maintenance and the replacement are easy, the production cost is reduced, and the working efficiency is improved;
preferably, in order to reduce the production cost, improve the work efficiency, reduce the production cycle, and improve the machining accuracy, the hydraulic cylinder 1 is made of a seamless stainless steel pipe, the through-holes 2 are equal-diameter through-holes, that is, the through-holes are open at both ends of the hydraulic cylinder 1, so that the general machining and precision grinding are facilitated, the through-holes 2 have a mirror finish, which is easy to make, and the yield is improved.
Example two:
in this embodiment, in order to reduce the movement resistance of the piston 8, the pressure change sensitivity in the second hydraulic chamber 10 and the first hydraulic chamber 9 is improved, and the working accuracy is improved; a sealing device is arranged on the outer side of the piston 8; the sealing device can adopt devices such as a sealing ring in the prior art, and the friction between the piston 8 and the inner wall of the hydraulic cylinder 1 can be reduced, so that when the piston 8 and the piston rod 7 move, the resistance is very small, the pressure change of the first hydraulic cavity 9 can be caused by the small pressure change of the second hydraulic cavity 10, the sensitivity is very high, the working precision is improved, and the performance of the hydraulic cylinder is very economic, and the practicability is high.
Preferably, in order to further reduce the resistance, the sealing means comprises a first sealing means 11 and a second sealing means 12; according to the condition that the friction force of each part is inconsistent, a combination form of two sealing devices is adopted, so that the resistance is further reduced, and the use cost is reduced, specifically, the first sealing device 11 is arranged at the upper end and the lower end of the outer side of the piston 8, and the first sealing device 1 is connected with the piston 8 through a screw by adopting a V-shaped hard sealing ring, more specifically a low-friction V-shaped hard sealing ring; the second sealing means 12 is arranged between the two first sealing means 11 at the upper and lower ends, i.e. in the middle outside the piston 8, and the second sealing means 12 is a wear ring, more specifically a low friction wear ring.
Example three:
in this embodiment, the piston rod 7 is modified to have a higher hardness, specifically, the outer side of the piston rod 7 is provided with a GUS coating, so that the surface hardness of the piston rod 7 is greater than or equal to HRC 60; because the piston rod 7 is often extended when the pressure transmitter works, the piston rod 7 is exposed in the general environment of a chemical plant, more dust is generated, sand grains and the like are easy to cause surface scratches, therefore, a layer of GUS coating is sprayed on the surface of the piston rod 7, the surface hardness of the piston rod 7 reaches more than HRC60, the piston rod is precisely ground and polished to be the same as a mirror surface, and a sealing device with ultralow friction force is matched, when the piston 8 and the piston rod 7 move, the resistance is very small, and the pressure change of the first hydraulic cavity 9 can be caused by the small pressure change of the second hydraulic cavity 10, so that the pressure transmitter is very sensitive, and has very excellent performance; the utility model has the advantages of low production cost, short shelf life, strong pollution resistance and long service life.
Preferably, the surface hardness of the piston rod 7 is greater than or equal to HRC 60.
Example four:
in the embodiment, in order to further reduce the moving resistance of the piston rod 7 and improve the working precision, a third sealing device 13 is arranged at the part of the first end cover 4, which is in contact with the piston rod 7; the third sealing device 13 is a sealing device in the prior art, such as a sealing ring, and the third sealing device 13 can ensure that the resistance of the piston 8 and the piston rod 7 is small during movement, so as to ensure smooth operation.
In conclusion, due to the adoption of the technical scheme, compared with the prior art, the pull rod type sealing auxiliary device is provided, the hydraulic cylinder 1 adopts the through hole 2 with two through ends, the processing is easy, the precision can be ensured, the end cover is detachably connected with the hydraulic cylinder 1 through the connecting rod 3, the assembly difficulty is reduced, the maintenance and the replacement are easy, the production cost is reduced, and the working efficiency is improved; the sealing device is arranged on the outer side of the piston 8, and the friction between the piston 8 and the inner wall of the hydraulic cylinder 1 can be reduced due to the arrangement of the sealing device, so that when the piston 8 and the piston rod 7 move, the resistance is very small, and the pressure change of the first hydraulic cavity 9 can be caused by the slight pressure change of the second hydraulic cavity 10, so that the sensitivity is very high, and the working precision is improved; in addition, a GUS coating can be arranged on the outer side of the piston rod 7, so that the hardness of the piston rod 7 can be improved, the service life of the piston rod 7 is prolonged, the resistance is very small, and the pressure change of the first hydraulic cavity 9 can be caused by the small pressure change of the second hydraulic cavity 10, so that the piston rod is very sensitive; in conclusion, the utility model has the advantages of simple structure, high precision, convenient disassembly and maintenance, low production cost and high processing efficiency.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are included in the scope of protection of the present invention.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present application will not be described separately.
In addition, any combination of the various embodiments of the present application can be made, and the present application should be considered as disclosed in the present application as long as the combination does not depart from the spirit of the present application.
Claims (10)
1. A pull rod type sealing auxiliary device comprises a hydraulic cylinder (1), and is characterized in that a through hole (2) is formed in the hydraulic cylinder (1), and the upper end and the lower end of the hydraulic cylinder (1) are respectively detachably connected with a first end cover (4) and a second end cover (5) through a connecting rod (3); and a piston rod (7) is arranged on the first end cover (4), the piston rod (7) extends into the hydraulic cylinder (1), and a piston (8) is arranged at one end of the piston rod (7) in the hydraulic cylinder (1).
2. The pull rod type sealing auxiliary device according to claim 1, wherein the first end cap (4) and the second end cap (5) are provided with mounting holes, two ends of the connecting rod (3) penetrate through the mounting holes, and two ends of the connecting rod (3) are provided with locking nuts (6).
3. The tie-rod type sealing assistance device according to claim 1, wherein a sealing means is provided outside the piston (8).
4. A tie rod type sealing assistance device according to claim 3, wherein the sealing means comprises a first sealing means (11) and a second sealing means (12).
5. The pull rod type seal assist device according to claim 4, wherein the first seal means (11) is provided at upper and lower ends outside the piston (8), and the first seal means (11) is a V-shaped hard seal ring.
6. The tie rod type seal assist device of claim 4, wherein the second seal means (12) is disposed between the first seal means (11), the second seal means (12) being a wear ring.
7. The pull rod type seal assist device according to claim 1, wherein the piston rod (7) is provided with a GUS coating on its outside.
8. The pull rod type seal assist device according to claim 1, wherein the surface hardness of the piston rod (7) is HRC60 or more.
9. The pull rod type seal assist device according to claim 1, wherein a portion of the first end cap (4) contacting the piston rod (7) is provided with a third seal means (13).
10. The tie rod type seal assist device of any one of claims 1 to 9, wherein the hydraulic cylinder (1) is a seamless stainless steel tube and the through hole (2) is a constant diameter through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121935594.7U CN215521458U (en) | 2021-08-18 | 2021-08-18 | Pull rod type sealing auxiliary device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121935594.7U CN215521458U (en) | 2021-08-18 | 2021-08-18 | Pull rod type sealing auxiliary device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215521458U true CN215521458U (en) | 2022-01-14 |
Family
ID=79791716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121935594.7U Active CN215521458U (en) | 2021-08-18 | 2021-08-18 | Pull rod type sealing auxiliary device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215521458U (en) |
-
2021
- 2021-08-18 CN CN202121935594.7U patent/CN215521458U/en active Active
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