CN220726707U - Two-stage piston type energy accumulator assembly - Google Patents

Abstract

The utility model discloses a two-stage piston type energy accumulator assembly, which comprises a first cylinder barrel, wherein a first piston is arranged in the first cylinder barrel, and a first air cover and an oil port end cover are respectively arranged at two ends of the first cylinder barrel; the first piston comprises a second cylinder barrel, a second piston is arranged in the second cylinder barrel, two ends of the second cylinder barrel are respectively provided with a second air cover and a piston limiting check ring, the second air cover is arranged at one end close to the first air cover, and the piston limiting check ring is used for limiting sliding of the second piston; the first piston is matched with the second piston to divide the inner cavity of the first cylinder barrel into a first air cavity, a second air cavity and an oil cavity which are mutually independent and have variable volumes, and the initial filling gas pressure in the first air cavity and the initial filling gas pressure in the second air cavity are different. The whole energy accumulator is simple and compact in structure, light in weight, small in installation space and convenient to install, holes are not needed in the first cylinder barrel and the second cylinder barrel, and manufacturing is easy.

Description

Two-stage piston type energy accumulator assembly

Technical Field

The utility model relates to the technical field of energy accumulators, in particular to a two-stage piston type energy accumulator assembly.

Background

In the field of hydro-pneumatic technology, piston accumulators are a common energy storage device. The conventional two-stage piston type energy accumulator structure is divided into two types, one is to adopt two single-stage piston type energy accumulators, and the two-stage piston type energy accumulators are connected in series through a pipeline, and the two-stage piston type energy accumulators in the form have large installation space due to the arrangement of a connecting pipeline and two cylinders. The other is to adopt an integral cylinder, an oil inlet is arranged in the middle of the cylinder, a floating piston is respectively arranged in the cylinder at the left side and the right side of the oil inlet, and two charging ports are respectively arranged at the two ends of the cylinder, which is equivalent to directly connecting the cylinders of two single-stage piston type energy accumulators together.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a two-stage piston type energy accumulator assembly which is simple and compact in structure, small in installation occupation space, easy to manufacture and convenient to use.

In order to solve the technical problems, the two-stage piston type energy accumulator assembly comprises a first cylinder barrel, wherein a first piston is arranged in the first cylinder barrel, and a first air cover and an oil port end cover are respectively arranged at two ends of the first cylinder barrel; the first piston comprises a second cylinder barrel, a second piston is arranged in the second cylinder barrel, a second air cover and a piston limiting check ring are respectively arranged at two ends of the second cylinder barrel, the second air cover is arranged at one end close to the first air cover, and the piston limiting check ring is used for limiting sliding of the second piston; the first piston is matched with the second piston to divide the inner cavity of the first cylinder barrel into a first air cavity, a second air cavity and an oil cavity which are mutually independent and have variable volumes, and the initial filling gas pressure in the first air cavity is different from the initial filling gas pressure in the second air cavity.

In the two-stage piston type energy accumulator assembly, a first cylinder barrel is divided into a first air cavity and an oil cavity by a first piston to form a one-stage piston type energy accumulator; the second air cavity is formed by arranging the second piston in the first piston, the second air cavity and the oil cavity at the other side of the second piston form a second-stage piston type energy accumulator, the whole energy accumulator is simple and compact in structure, light in weight, small in installation space and convenient to install, holes are not needed in the first cylinder barrel and the second cylinder barrel, and the manufacturing is easy.

As an improvement of the two-stage piston type energy accumulator assembly, the first air cavity is positioned between the first air cover and the second air cover; the second air cavity is positioned between the second air cover and the second piston; the oil cavity is positioned between the second piston and the oil port end cover.

Further, the initial charge gas pressure in the first air chamber is less than the initial charge gas pressure in the second air chamber. When the hydraulic oil pump works, the first air cavity firstly carries out compression energy storage, and when the oil pressure rises to the air pressure in the second air cavity, the second air cavity compresses and stores energy again to form two-stage piston type energy storage.

Further, a first air port which is communicated with the first air cavity and the outside is formed in the first air cover; the second air cover is provided with a second air port which is communicated with the first air cavity and the second air cavity; and the oil port end cover is provided with an oil port for communicating the oil cavity with the outside.

Preferably, the first air port, the second air port and the oil port are all arranged at the center of the corresponding end cover.

As another improvement of the two-stage piston type energy accumulator assembly, the first air cover, the oil port end cover and the second air cover are detachably fixed at the end parts of the corresponding cylinder barrel and are sealed.

Further, the oil port end cover comprises a stepped columnar end cover body, the end cover body comprises a first column section and a second column section, the diameter of the first column section is smaller than that of the second column section, a sealing ring groove for placing a sealing ring is formed in the side face of the first column section, and an external thread for being in threaded connection with the inner wall of the first cylinder barrel is formed in the side face of the second column section.

The embedded fixed connection of the oil port end cover is realized through the external threads, the sealing between the oil port end cover and the first cylinder barrel is realized through the sealing ring in the sealing ring groove, the installation structure of the whole end cover is simple, the oil port end cover is embedded into the cylinder barrel, and the occupied space is small.

Further, a rotary force application structure is arranged on the end face of the second column section, and the rotary force application structure comprises at least two column holes arranged on the end face or hexagonal grooves arranged on the end face. The end cap can be inserted through the post hole or the hexagonal groove by means of a tool, and then screwed to the end of the cylinder by applying a rotational force to the port end cap by means of the shank of the tool.

Further, the middle part of the end face of the first column section is provided with a groove, the size of the oil cavity is increased, and a larger oil storage space is provided.

Further, be provided with on the tip inner wall of first cylinder with the shoulder hole structure of end cover body adaptation, shoulder hole structure includes first hole and second hole, the aperture of first hole is greater than the second hole, just first hole is located the outside of second hole, be provided with on the inner wall of first hole with the internal thread of external screw thread adaptation, the second hole with seal through the sealing washer between the first post section.

Preferably, the structures of the first air cover and the second air cover are the same as the fixed connection structure of the oil port end cover.

As a further improvement of the two-stage piston type energy accumulator assembly, the first cylinder barrel and the second cylinder barrel are of column barrel structures with two open ends, and the second cylinder barrel is arranged on the inner wall of the first cylinder barrel in a sliding manner and keeps sealing with the inner wall of the first cylinder barrel; the second piston is arranged on the inner wall of the second cylinder in a sliding manner and keeps sealing with the inner wall of the second cylinder.

In summary, the two-stage piston type energy accumulator assembly has the advantages of compact structure, light weight, small installation space, convenient installation and easy processing and manufacturing.

Drawings

In the drawings:

FIG. 1 is a cross-sectional view of a two-stage piston accumulator assembly of the present utility model.

FIG. 2 is a cross-sectional view of an oil port end cap of a two-stage piston accumulator assembly of the present utility model.

FIG. 3 is a block diagram of an oil port end cap arrangement post hole of a two-stage piston accumulator assembly of the present utility model.

Fig. 4 is a block diagram of a two-stage piston accumulator assembly of the present utility model having a hexagonal slot in the port end cap.

Fig. 5 is an end cross-sectional view of a first cylinder of the two-stage piston accumulator assembly of the present utility model.

Fig. 6 is a structural diagram of a tool used when the end cap has a four-post hole configuration.

Reference numerals illustrate: 1. a first cylinder; 11. a first air cap; 111. a first gas port; 12. an oil port end cover; 121. an end cap body; 122. a first column section; 123. a second column section; 124. sealing ring grooves; 125. an external thread; 126. a groove; 127. a rotary force application structure; 1271. a post hole; 1272. a hexagonal groove; 128. an oil port; 13. a first air chamber; 14. a second air chamber; 15. an oil chamber; 161. a first bore; 162. a second bore; 2. a first piston; 21. a second cylinder; 22. a second piston; 23. a second air cap; 231. a second gas port; 24. and a piston limiting retainer ring.

Detailed Description

The following describes the embodiments of the present utility model further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present utility model, but is not intended to limit the present utility model.

Figures 1-5 illustrate a two-stage piston accumulator assembly of the present utility model. As shown in fig. 1, the two-stage piston type energy accumulator assembly comprises a first cylinder barrel 1, wherein a first piston 2 is arranged in the first cylinder barrel 1, and two ends of the first cylinder barrel 1 are respectively provided with a first air cover 11 and an oil port end cover 12; the first piston 2 comprises a second cylinder 21, a second piston 22 is arranged in the second cylinder 21, a second air cover 23 and a piston limiting check ring 24 are respectively arranged at two ends of the second cylinder 21, the second air cover 23 is arranged at one end close to the first air cover 11, and the piston limiting check ring 24 is used for limiting the sliding of the second piston 22; the first piston 2 and the second piston 22 cooperate to divide the inner cavity of the first cylinder tube 1 into a first air cavity 13, a second air cavity 14 and an oil cavity 15 which are mutually independent and have variable volumes, and the initial filling air pressure in the first air cavity 13 and the initial filling air pressure in the second air cavity 14 are different.

Optionally, the first air chamber 13 is located between the first air cap 11 and the second air cap 23; the second air chamber 14 is located between the second air cap 23 and the second piston 22; the oil chamber 15 is located between the second piston 22 and the port end cap 12.

Optionally, the initial charge gas pressure in the first gas chamber 13 is less than the initial charge gas pressure in the second gas chamber 14. When the hydraulic oil pump works, the first air cavity 13 firstly carries out compression energy storage, and when the oil pressure rises to the air pressure in the second air cavity 14, the second air cavity 14 compresses the energy storage again to form two-stage piston type energy storage.

Optionally, a first air port 111 is arranged on the first air cover 11 and is used for communicating the first air cavity 13 with the outside; the second air cover 23 is provided with a second air port 231 which is communicated with the first air cavity 13 and the second air cavity 14; an oil port 128 for communicating the oil chamber 15 with the outside is provided on the oil port end cap 12. The first gas port 111, the second gas port 231, and the oil port 128 are all disposed at the center of the corresponding end caps.

Optionally, the first air cap 11, the oil port end cap 12 and the second air cap 23 are detachably fixed at the end of the corresponding cylinder barrel and sealed.

Optionally, as shown in fig. 2, the oil port end cover 12 includes a stepped cylindrical end cover body 121, the end cover body 121 includes a first column section 122 and a second column section 123, the diameter of the first column section 122 is smaller than that of the second column section 123, a sealing ring groove 124 for placing a sealing ring is provided on a side surface of the first column section 122, and an external thread 125 for being in threaded connection with an inner wall of the first cylinder barrel 1 is provided on a side surface of the second column section 123.

Optionally, the end surface of the second column section 123 is provided with a rotary force application structure 127, and the rotary force application structure 127 includes at least two column holes 1271 provided on the end surface or hexagonal grooves 1272 provided on the end surface. The end cap can be screwed to the end of the cylinder barrel by inserting a tool into the cylindrical hole 1271 or the hexagonal groove 1272 and then applying a rotational force to the oil port end cap 12 by the stem of the tool, thereby facilitating the operation.

As shown in fig. 3, four column holes 1271 are provided on the end surface of the second column section 123, and pins can be inserted into the column holes 1271, so that the rotation operation can be performed by using the tool shown in fig. 6, and the four column holes 1271 are uniformly spaced in the circumferential direction, so that the force can be applied uniformly. As shown in fig. 4, a hexagonal slot 1272 is provided on the end surface of the second column section 123, and the hexagonal slot 1272 is coaxial with the second column section 123, and an outer hexagonal cylinder structure can be inserted into the hexagonal slot, or a special tool can be used for rotation operation.

Optionally, a groove 126 is provided in the middle of the end surface of the first column section 122, which increases the volume of the oil chamber 15 and provides a larger oil storage space.

Optionally, as shown in fig. 5, a stepped hole structure adapted to the end cover body 121 is disposed on an inner wall of an end portion of the first cylinder barrel 1, the stepped hole structure includes a first inner hole 161 and a second inner hole 162, a hole diameter of the first inner hole 161 is larger than that of the second inner hole 162, the first inner hole 161 is located at an outer side of the second inner hole 162, an inner thread adapted to the external thread 125 is disposed on an inner wall of the first inner hole 161, and a seal ring seals between the second inner hole 162 and the first column section 122.

The internal thread of the first inner hole 161 is matched with the external thread 125, so that the embedded fixed connection of the oil port end cover 12 is realized, the sealing between the oil port end cover 12 and the first cylinder barrel 1 is realized through the sealing ring between the second inner hole 162 and the sealing ring groove 124, the installation structure of the whole end cover is simple, the whole end cover is embedded into the cylinder barrel, and the occupied space is small.

Optionally, the structures of the first air cover 11 and the second air cover 23 are the same as the fixed connection structure of the oil port end cover 12, and the three end covers are embedded and fixed on the inner side of the end part of the column casing, have the same connection structure, and are convenient to manufacture and install. In fig. 1, the oil port cover 12 has a cylindrical hole 1271, and the first gas cap 11 has a hexagonal groove 1272.

When the two-stage piston type energy accumulator is used, in the assembling process, the second cylinder 21, the second piston 22 and the second air cover 23 are assembled to form the first piston 2, and after the assembly, air is filled from the second air port 231 by using a professional air filling tool; then, the first piston 2 is integrally placed in the first cylinder tube 1, and after the first air cap 11 and the oil port end cap 12 are assembled, air is filled from the first air port 111 by using a professional air-filling tool. When inflated, the initial inflation pressure of the second air chamber 14 in the first piston 2 is greater than the initial inflation pressure of the first air chamber 13.

When the hydraulic system charges the cap two-stage piston accumulator through port 128:

if the oil charge pressure is greater than the initial charge pressure of the first air chamber 13 and less than the initial charge pressure of the second air chamber 14, the first piston 2 moves as a whole in the first cylinder 1, compressing the air in the first air chamber 13, and the second piston 22 is stationary relative to the second cylinder 21;

if the oil charge pressure is greater than the initial charge pressure of the second air chamber 14, the first piston 2 moves as a whole, compressing the gas in the first air chamber 13, while the second piston 22 moves within the second cylinder 21, compressing the gas in the second air chamber 14 until the pressure is balanced.

When the two-stage piston accumulator is capped to replenish oil in the hydraulic system: the volume of the gas in the first gas chamber 13 increases to push the second piston 22 as a whole, thereby pushing the hydraulic oil in the oil chamber 15 to flow from the oil port 128 to the hydraulic system until the end surface of the oil port end cover 12 contacts the second cylinder 21. At the same time, the volume of gas in the second air chamber 14 also increases, pushing the second piston 22 to move, thereby pushing the hydraulic oil in the oil chamber 15 from the oil port 128 to the hydraulic system until the second piston 22 contacts the piston retainer ring 24.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the scope of protection thereof, and although the present utility model has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: various changes, modifications, or equivalents may be made to the particular embodiments of the utility model by those skilled in the art after reading the present disclosure, but such changes, modifications, or equivalents are within the scope of the utility model as defined in the appended claims.

Claims (10)

1. The two-stage piston type energy accumulator assembly is characterized by comprising a first cylinder barrel (1), wherein a first piston (2) is arranged in the first cylinder barrel (1), and a first air cover (11) and an oil port end cover (12) are respectively arranged at two ends of the first cylinder barrel (1);

the first piston (2) comprises a second cylinder barrel (21), a second piston (22) is arranged in the second cylinder barrel (21), a second air cover (23) and a piston limiting check ring (24) are respectively arranged at two ends of the second cylinder barrel (21), the second air cover (23) is arranged at one end close to the first air cover (11), and the piston limiting check ring (24) is used for limiting sliding of the second piston (22);

the first piston (2) is matched with the second piston (22), the inner cavity of the first cylinder barrel (1) is divided into a first air cavity (13), a second air cavity (14) and an oil cavity (15) which are mutually independent and have variable volumes, and the initial filling air pressure in the first air cavity (13) is different from the initial filling air pressure in the second air cavity (14).

2. A two-stage piston accumulator assembly according to claim 1, characterized in that the first air chamber (13) is located between the first air cap (11) and the second air cap (23); the second air cavity (14) is positioned between the second air cover (23) and the second piston (22); the oil cavity (15) is located between the second piston (22) and the oil port end cover (12).

3. A two-stage piston accumulator assembly according to claim 2, characterized in that the initial charge gas pressure in the first air chamber (13) is smaller than the initial charge gas pressure in the second air chamber (14).

4. A two-stage piston accumulator assembly according to claim 2, characterized in that the first gas cap (11) is provided with a first gas port (111) communicating the first gas chamber (13) with the outside; the second air cover (23) is provided with a second air port (231) which is communicated with the first air cavity (13) and the second air cavity (14); an oil port (128) for communicating the oil cavity (15) with the outside is arranged on the oil port end cover (12).

5. A two-stage piston accumulator assembly according to claim 1, characterized in that the first gas cap (11), the oil port end cap (12) and the second gas cap (23) are all detachably fixed to the ends of the corresponding cylinder and sealed.

6. The two-stage piston accumulator assembly according to claim 1, characterized in that the oil port end cap (12) comprises a stepped cylindrical end cap body (121), the end cap body (121) comprises a first column section (122) and a second column section (123), the diameter of the first column section (122) is smaller than that of the second column section (123), a sealing ring groove (124) for placing a sealing ring is arranged on the side surface of the first column section (122), and an external thread (125) for being in threaded connection with the inner wall of the first cylinder barrel (1) is arranged on the side surface of the second column section (123).

7. A two-stage piston accumulator assembly according to claim 6, characterized in that the end face of the second column section (123) is provided with a rotary force application structure (127), the rotary force application structure (127) comprising at least two column holes (1271) provided on the end face or hexagonal grooves (1272) provided on the end face.

8. A two-stage piston accumulator assembly according to claim 6, characterized in that the end face middle of the first column section (122) is provided with a groove (126).

9. The two-stage piston accumulator assembly according to claim 6, characterized in that a stepped hole structure adapted to the end cover body (121) is arranged on the inner wall of the end part of the first cylinder barrel (1), the stepped hole structure comprises a first inner hole (161) and a second inner hole (162), the aperture of the first inner hole (161) is larger than that of the second inner hole (162), the first inner hole (161) is positioned on the outer side of the second inner hole (162), an inner thread adapted to the outer thread (125) is arranged on the inner wall of the first inner hole (161), and the second inner hole (162) and the first column section (122) are sealed by a sealing ring.

10. A two-stage piston accumulator assembly according to claim 1, characterized in that the first cylinder (1) and the second cylinder (21) are both in a cylindrical structure with two open ends, the second cylinder (21) being slidingly arranged on the inner wall of the first cylinder (1) and kept sealed with the inner wall of the first cylinder (1); the second piston (22) is slidably arranged on the inner wall of the second cylinder barrel (21) and keeps sealing with the inner wall of the second cylinder barrel (21).