CN218971371U - Piston assembly, hydrogen compressor, compression system and hydrogenation equipment - Google Patents
Piston assembly, hydrogen compressor, compression system and hydrogenation equipment Download PDFInfo
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- CN218971371U CN218971371U CN202223243483.7U CN202223243483U CN218971371U CN 218971371 U CN218971371 U CN 218971371U CN 202223243483 U CN202223243483 U CN 202223243483U CN 218971371 U CN218971371 U CN 218971371U
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Abstract
The utility model relates to the technical field of supercharging equipment, and provides a piston assembly, a hydrogen compressor, a compression system and hydrogenation equipment, wherein the piston assembly comprises a piston and a piston rod, and the axial direction of the piston is parallel to the axial direction of the piston rod; the end face of one of the piston rod and the piston is a convex first spherical crown face, the end face of the other one of the piston rod and the piston rod is a plane or a concave second spherical crown face, the plane, the base circle of the first spherical crown face and the plane of the base circle of the second spherical crown face are perpendicular to the axis direction of the piston rod, the spherical center corresponding to the first spherical crown face is located on the central axis of one of the piston and the piston rod, the spherical center corresponding to the second spherical crown face is located on the central axis of the other one of the piston and the piston rod, and the spherical diameter corresponding to the second spherical crown face is larger than or equal to the spherical diameter corresponding to the first spherical crown face. The hydraulic piston compressor solves the problem that in the prior art, the assembly accuracy requirements of a piston rod and a piston in a cylinder are high.
Description
Technical Field
The utility model relates to the technical field of supercharging equipment, in particular to a piston assembly, a hydrogen compressor, a compression system and hydrogenation equipment.
Background
Liquid-driven piston compressors find good application in the field of high-pressure hydrogen compression, for example, liquid-driven piston compressors are widely used in hydrogen stations. The hydraulic piston compressor comprises a hydraulic cylinder and a cylinder, wherein a piston in the cylinder is connected with a piston in the hydraulic cylinder through a piston rod. The piston in the hydraulic cylinder is driven to displace by hydraulic pressure, so that the piston rod drives the piston in the cylinder to displace reciprocally, and the compression of hydrogen is realized.
In the prior art, the cylinder and the hydraulic cylinder are generally coaxially arranged, so that two ends of the piston rod are respectively and fixedly connected with the piston of the cylinder and the piston of the hydraulic cylinder, the piston of the cylinder is in sliding sealing fit with the cylinder barrel of the cylinder, the piston of the hydraulic cylinder is in sliding sealing fit with the cylinder barrel of the hydraulic cylinder, and high requirements are provided for the assembly precision of the piston rod and the piston. However, when the piston rod and the piston are processed and assembled, some centering deviation is inevitably generated, so that the axis of the piston rod is not coincident with the axis of the piston, and the piston rod generates radial acting force on the piston after being assembled with the cylinder barrel and the hydraulic cylinder due to the fact that the piston and the piston rod are fixed together. For the piston in the cylinder, be oilless seal between piston and the cylinder inner wall of cylinder, if the piston rod produces radial effort to the piston in compression process, can lead to sealing member such as piston ring on the piston to appear the problem of eccentric wear, influence the sealing performance between piston and the cylinder's the cylinder, and then can influence the compression efficiency of compressor.
Therefore, how to solve the problem that the liquid-driven piston compressor in the prior art has high requirement on the assembly precision of the piston rod and the piston in the cylinder becomes an important technical problem to be solved by the person skilled in the art.
Disclosure of Invention
The utility model provides a piston assembly, a hydrogen compressor, a compression system and hydrogenation equipment, which are used for solving the defect that a liquid drive piston compressor in the prior art has high requirement on the assembly precision of a piston rod and a piston in a cylinder.
The utility model provides a piston assembly, which comprises a piston and a piston rod, wherein the axial direction of the piston is parallel to the axial direction of the piston rod, and the piston rod are arranged to be capable of relatively displacing along the axial direction of the piston rod;
the end face of one of the piston rod and the piston is a first convex spherical crown face, the end face of the other one of the piston rod and the piston rod is a second concave spherical crown face, the plane of the base circle of the first spherical crown face and the plane of the base circle of the second spherical crown face are perpendicular to the axial direction of the piston rod, the spherical center corresponding to the first spherical crown face is located on the central axis of one of the piston and the piston rod, the spherical center corresponding to the second spherical crown face is located on the central axis of the other one of the piston and the piston rod, and the spherical diameter corresponding to the second spherical crown face is larger than or equal to the spherical diameter corresponding to the first spherical crown face.
According to the piston assembly provided by the utility model, the piston rod comprises the piston rod body and the ball head part, the ball head part is arranged at one end of the piston rod body facing the piston, the ball center corresponding to the ball head part is positioned on the central axis of the piston rod body, and the ball head part and the piston rod body are formed into an integrated structure.
According to the piston assembly provided by the utility model, the surface of the piston facing the piston rod is provided with the matching groove, the wall surface of the matching groove is a spherical crown surface, and the spherical diameter corresponding to the spherical crown surface is equal to the diameter corresponding to the ball head part.
According to the piston assembly provided by the utility model, the end of the piston facing the piston rod is provided with the accommodating groove, the matching groove is arranged on the bottom wall of the accommodating groove, a space is reserved between the side wall of the accommodating groove and the end part of the piston rod, and the end part of the piston rod can enter and exit the accommodating groove.
According to the piston assembly provided by the utility model, the cross section of the accommodating groove is circular, and the diameter of the opening end of the accommodating groove is larger than the maximum diameter of the end part of the piston rod.
According to the piston assembly provided by the utility model, the piston rod body and the ball head part are integrally formed.
According to the piston assembly provided by the utility model, the side surface of the piston is provided with the annular groove for installing the piston ring.
The utility model also provides a hydrogen compressor comprising the piston assembly.
The utility model also provides a compression system comprising the hydrogen compressor.
The utility model also provides hydrogenation equipment comprising the compression system.
The piston assembly comprises a piston and a piston rod, wherein the axial direction of the piston is parallel to the axial direction of the piston rod, and the piston rod can relatively displace along the axial direction of the piston rod. One of the end face of the piston rod and the piston is a convex first spherical crown face, and the other end face of the piston rod and the piston is a plane or a concave second spherical crown face. The plane, the plane of the base circle of the first spherical crown surface and the plane of the base circle of the second spherical crown surface are perpendicular to the axis direction of the piston rod, the sphere center corresponding to the first spherical crown surface is located on the central axis of one of the piston and the piston rod, and the sphere center corresponding to the second spherical crown surface is located on the central axis of the other of the piston and the piston rod. The spherical diameter corresponding to the second spherical crown surface is larger than or equal to the spherical diameter corresponding to the first spherical crown surface, so that the first spherical crown surface can be contacted with the second spherical crown surface. When one of the piston rod and the piston is provided with the first spherical crown surface and the other is provided with the plane, when the piston rod pushes the piston to displace, the acting force generated by the action of the first spherical crown surface and the plane is perpendicular to the plane, namely, the acting force generated by the piston rod on the piston is along the axial direction of the piston, the acting force along the radial direction of the piston can not be generated on the piston, and the stress of the piston is uniform. When one of the piston rod and the piston is provided with a first spherical crown surface and the other is provided with a second spherical crown surface, when the piston rod pushes the piston to displace, the straight line where the acting force generated by the action of the first spherical crown surface and the second spherical crown surface is located is overlapped with the straight line where the spherical center corresponding to the first spherical crown surface and the spherical center corresponding to the second spherical crown surface are located, namely, the acting force generated by the piston rod on the piston is along the axial direction of the piston, the acting force along the radial direction of the piston is not generated on the piston, and the stress of the piston is uniform. Therefore, when the piston assembly is applied to the cylinder of the liquid-driven piston compressor, the eccentric wear of sealing elements such as the piston ring on the piston can be effectively avoided, the service life of the sealing elements such as the piston ring is prolonged, the sealing performance between the piston and the cylinder barrel of the cylinder is ensured, the compression efficiency of the compressor is further ensured, and the problem that the liquid-driven piston compressor in the prior art has high requirement on the assembly precision of the piston rod and the piston in the cylinder is solved.
In addition, the piston and the piston rod are arranged in a mode of being capable of relatively displacing along the axial direction of the piston rod, when the piston is required to displace along the direction of increasing the compression cavity relative to the cylinder barrel of the cylinder, the piston rod is driven to displace along the direction away from the piston by the hydraulic cylinder, the piston displaces under the action of the gas pressure in the compression cavity, the piston cannot produce tensile force on the piston rod, and the stress of the piston and the piston rod can be reduced.
Further, in the hydrogen compressor provided by the utility model, the piston assembly is provided, so that various advantages are provided as described above.
Further, in the compression system provided by the utility model, the hydrogen compressor is provided, so that various advantages are provided as described above.
Further, the hydrogenation apparatus provided by the present utility model has the above-described compression system, and thus has various advantages as described above.
Drawings
In order to more clearly illustrate the utility model or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a liquid-driven piston compressor having a piston assembly provided by the present utility model;
FIG. 2 is a cross-sectional view of a piston assembly provided by the present utility model;
FIG. 3 is a schematic view of a part of the structure of a piston rod provided by the utility model;
fig. 4 is a cross-sectional view of a piston provided by the present utility model.
Reference numerals:
1. a piston; 2. a piston rod; 3. a first spherical cap surface; 4. a second spherical cap surface; 5. a piston rod body; 6. a ball head portion; 7. a mating groove; 8. a receiving groove; 9. an annular groove; 10. a compression chamber; 11. a cylinder barrel; 12. and a hydraulic cylinder.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The piston assembly of the present utility model is described below in connection with fig. 1 to 4.
As shown in fig. 1 to 4, the piston assembly provided by the embodiment of the utility model includes a piston 1 and a piston rod 2, wherein the axial direction of the piston 1 is parallel to the axial direction of the piston rod 2, and the piston 1 and the piston rod 2 can relatively displace along the axial direction of the piston rod 2.
One of the piston rod 2 and the piston 1 has an end face which is a first spherical crown face 3 protruding outwards, and the other has an end face which is a second spherical crown face 4 plane or recessed inwards. The plane, the plane of the base circle of the first spherical cap surface 3 and the plane of the base circle of the second spherical cap surface 4 are perpendicular to the axial direction of the piston rod 2, the spherical center corresponding to the first spherical cap surface 3 is located on the central axis of one of the piston 1 and the piston rod 2, and the spherical center corresponding to the second spherical cap surface 4 is located on the central axis of the other of the piston 1 and the piston rod 2. The spherical diameter corresponding to the second spherical cap surface 4 is greater than or equal to the spherical diameter corresponding to the first spherical cap surface 3, so that the first spherical cap surface 3 can be in contact with the second spherical cap surface 4.
When one of the piston rod 2 and the piston 1 is provided with the first spherical cap surface 3, and the other is provided with the plane, when the piston rod 2 pushes the piston 1 to displace, the acting force generated by the action of the first spherical cap surface 3 and the plane is perpendicular to the plane, namely, the acting force generated by the piston rod 2 on the piston 1 is along the axial direction of the piston 1, the acting force along the radial direction of the piston 1 is not generated on the piston 1, and the stress of the piston 1 is uniform.
When one of the piston rod 2 and the piston 1 is provided with the first spherical crown surface 3, and the other is provided with the second spherical crown surface 4, when the piston rod 2 pushes the piston 1 to displace, the straight line where the acting force generated by the action of the first spherical crown surface 3 and the second spherical crown surface 4 is located coincides with the straight line where the spherical center corresponding to the first spherical crown surface 3 and the spherical center corresponding to the second spherical crown surface 4 are located, that is, the acting force generated by the piston rod 2 on the piston 1 is along the axial direction of the piston 1, the acting force along the radial direction of the piston 1 is not generated, and the stress of the piston 1 is uniform.
Therefore, when the piston assembly provided by the embodiment is applied to the cylinder barrel 11 of the liquid-driven piston compressor, eccentric wear of sealing elements such as a piston ring on the piston 1 can be effectively avoided, the service life of the sealing elements such as the piston ring is prolonged, the sealing performance between the piston 1 and the cylinder barrel 11 is ensured, the compression efficiency of the compressor is further ensured, and the problem that the liquid-driven piston compressor in the prior art has high requirement on the assembly precision of the piston rod 2 and the piston 1 in the cylinder is solved.
In addition, the piston 1 and the piston rod 2 are arranged in a mode of being capable of relatively displacing along the axial direction of the piston rod 2, when the piston 1 needs to displace relative to the cylinder barrel 11 along the direction of increasing the compression cavity 10, the piston rod 2 is driven to displace along the direction away from the piston 1 by the hydraulic cylinder 12, the piston 1 displaces under the action of the gas pressure in the compression cavity 10, the piston 1 does not generate a pulling force on the piston rod 2, and the stress of the piston 1 and the piston rod 2 can be reduced; moreover, the piston 1 is displaced only under the action of the air pressure in the compression cavity 10, and can be used for feeding air into the compression cavity 10 only when the air source is enough and the air pressure is enough, so that the problem of forced air suction caused by the displacement of the piston 1 driven by the piston rod 2 can be avoided when the air source is insufficient or the air pressure is low, and the safety of the liquid-driven piston compressor is improved.
The compression chamber 10 is a chamber surrounded by the piston 1 and the cylinder tube 11 and located on a side of the piston 1 away from the piston rod 2.
An annular groove 9 is provided on the side of the piston 1 for mounting a piston ring. When the piston assembly in the present embodiment is assembled and connected with the cylinder tube 11, the piston 1 is in sliding sealing contact with the cylinder tube 11 through the piston ring to ensure the sealing property of the compression chamber 10.
In the embodiment of the utility model, the convex first spherical crown surface 3 is formed at the end of the piston rod 2 by arranging a ball head at the end of the piston rod 2.
Specifically, the piston rod 2 includes a piston rod body 5 and a ball head portion 6, the ball head portion 6 is disposed at one end of the piston rod body 5 facing the piston 1, and a center of sphere corresponding to the ball head portion 6 is located on a central axis of the piston rod body 5, referring to fig. 3.
The ball portion 6 and the piston rod body 5 are formed as an integral structure. The piston rod body 5 and the ball head part 6 can be integrally formed by casting, machining and the like, or the ball head part 6 and the piston rod body 5 can be fixedly connected together by welding after the ball head part 6 and the piston rod body 5 are respectively processed.
In this embodiment, a mating groove 7 is provided on a surface of the piston 1 facing the piston rod 2, as shown in fig. 4, a wall surface of the mating groove 7 is a spherical cap surface, and a spherical diameter corresponding to the spherical cap surface is equal to a diameter corresponding to the ball head portion 6. When the piston rod 2 pushes the piston 1 to displace, the ball head part 6 of the piston rod 2 is in contact with the matching groove 7 of the piston 1, so that the stress of the piston 1 is even, and the contact area between the piston rod 2 and the piston 1 is increased.
In this embodiment, a housing groove 8 is provided at an end of the piston 1 facing the piston rod 2, and a fitting groove 7 is provided at a bottom wall of the housing groove 8. The lateral wall of holding tank 8 has the interval between with the piston rod 2 tip, and the tip of piston rod 2 can business turn over holding tank 8 for the tip of piston rod 2 is floating connection with piston 1, when needs make piston 1 along making compression chamber 10 the direction that increases for cylinder barrel 11 displacement, ensures that piston rod 2 can separate with piston 1, avoids piston 1 to produce the pulling force to piston rod 2.
Specifically, the cross-sectional shape of the accommodation groove 8 is circular, and the diameter of the open end of the accommodation groove 8 is larger than the maximum diameter of the end of the piston rod 2.
In a specific embodiment, the receiving groove 8 may be provided as a cylindrical groove.
On the other hand, the embodiment of the utility model also provides a hydrogen compressor, which comprises the piston assembly provided by any embodiment. The piston assembly in the embodiment can lead the stress of the piston 1 to be uniform, avoid eccentric wear of sealing elements such as a piston ring on the piston 1, and effectively reduce the requirement of the liquid-driven piston compressor on the assembly precision of the piston rod 2 and the piston 1 in the cylinder. Therefore, the hydrogen compressor in the embodiment has the advantages of convenience in assembly and low assembly precision requirement. The development process of the beneficial effects of the hydrogen compressor in the embodiment of the present utility model is substantially similar to that of the piston assembly described above, and therefore will not be repeated here.
In yet another aspect, an embodiment of the present utility model further provides a compression system, including the hydrogen compressor provided in any one of the above embodiments. All advantages of the above-described hydrogen compressor are provided and will not be described in detail herein. The development process of the beneficial effects of the compression system in the embodiment of the present utility model is substantially similar to that of the above-mentioned hydrogen compressor, and therefore will not be repeated here.
In still another aspect, an embodiment of the present utility model further provides a hydrogenation apparatus, including the compression system provided in any one of the foregoing embodiments. All the advantages of the compression system described above are provided and will not be described in detail herein. The development process of the beneficial effects of the hydrogenation apparatus in the embodiments of the present utility model is substantially similar to that of the compression system described above, and therefore will not be described herein.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (10)
1. A piston assembly comprising a piston and a piston rod, the axial direction of the piston being parallel to the axial direction of the piston rod, the piston and the piston rod being arranged to be relatively displaceable in the axial direction of the piston rod;
the end face of one of the piston rod and the piston is a first convex spherical crown face, the end face of the other one of the piston rod and the piston rod is a second concave spherical crown face, the plane of the base circle of the first spherical crown face and the plane of the base circle of the second spherical crown face are perpendicular to the axial direction of the piston rod, the spherical center corresponding to the first spherical crown face is located on the central axis of one of the piston and the piston rod, the spherical center corresponding to the second spherical crown face is located on the central axis of the other one of the piston and the piston rod, and the spherical diameter corresponding to the second spherical crown face is larger than or equal to the spherical diameter corresponding to the first spherical crown face.
2. The piston assembly of claim 1, wherein the piston rod comprises a piston rod body and a ball head portion, the ball head portion is disposed at an end of the piston rod body facing the piston, a center of sphere corresponding to the ball head portion is located on a central axis of the piston rod body, and the ball head portion and the piston rod body are formed as an integral structure.
3. The piston assembly according to claim 2, wherein a mating groove is formed in a surface of the piston facing the piston rod, a wall surface of the mating groove is a spherical crown surface, and a spherical diameter corresponding to the spherical crown surface is equal to a diameter corresponding to the ball head portion.
4. A piston assembly according to claim 3, wherein the end of the piston facing the piston rod is provided with a receiving groove, the mating groove being provided in the bottom wall of the receiving groove, the side wall of the receiving groove being spaced from the end of the piston rod, the end of the piston rod being able to enter and exit the receiving groove.
5. The piston assembly of claim 4 wherein said receiving groove is circular in cross-sectional shape and the diameter of the open end of said receiving groove is greater than the maximum diameter of the end of said piston rod.
6. The piston assembly of claim 2 wherein said piston rod body is integrally formed with said ball head.
7. A piston assembly according to claim 1, wherein the piston is provided on its side with an annular groove for mounting a piston ring.
8. A hydrogen compressor comprising a piston assembly as claimed in any one of claims 1 to 7.
9. A compression system comprising the hydrogen compressor of claim 8.
10. A hydrogenation apparatus comprising a compression system according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223243483.7U CN218971371U (en) | 2022-12-02 | 2022-12-02 | Piston assembly, hydrogen compressor, compression system and hydrogenation equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223243483.7U CN218971371U (en) | 2022-12-02 | 2022-12-02 | Piston assembly, hydrogen compressor, compression system and hydrogenation equipment |
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| Publication Number | Publication Date |
|---|---|
| CN218971371U true CN218971371U (en) | 2023-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223243483.7U Active CN218971371U (en) | 2022-12-02 | 2022-12-02 | Piston assembly, hydrogen compressor, compression system and hydrogenation equipment |
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| CN (1) | CN218971371U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117286542A (en) * | 2023-09-21 | 2023-12-26 | 三一氢能有限公司 | Gas-liquid separation box, bipolar plate, electrolytic tank and hydrogen production system |
| CN117685218A (en) * | 2024-01-31 | 2024-03-12 | 四川宏华电气有限责任公司 | Hyperboloid automatic aligning piston rod and processing technology thereof |
-
2022
- 2022-12-02 CN CN202223243483.7U patent/CN218971371U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117286542A (en) * | 2023-09-21 | 2023-12-26 | 三一氢能有限公司 | Gas-liquid separation box, bipolar plate, electrolytic tank and hydrogen production system |
| CN117286542B (en) * | 2023-09-21 | 2024-05-24 | 三一氢能有限公司 | Gas-liquid separation box, bipolar plate, electrolytic tank and hydrogen production system |
| CN117685218A (en) * | 2024-01-31 | 2024-03-12 | 四川宏华电气有限责任公司 | Hyperboloid automatic aligning piston rod and processing technology thereof |
| CN117685218B (en) * | 2024-01-31 | 2024-04-23 | 四川宏华电气有限责任公司 | Hyperboloid automatic aligning piston rod and processing technology thereof |
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