Novel piston type energy accumulator

Abstract

The utility model discloses a novel piston type energy accumulator, belongs to the field of energy accumulators, and solves the problem that an existing energy accumulator is inconvenient to select materials and process. The hydraulic cylinder comprises a cylinder sleeve, an upper end cover and a lower end cover are arranged at the two ends of the cylinder sleeve respectively, the lower end cover is detachably connected with the cylinder sleeve, a piston is installed in the cylinder sleeve in a sliding mode, a limiting step is arranged on the inner wall of the end, close to the upper end cover, of the cylinder sleeve, and the upper end cover comprises a round cover and a limiting flange. The limiting flange is arranged on the outer wall of the round cover in a surrounding mode, the round cover is movably connected in a center hole formed in the inner side wall of the limiting step in an inserted mode, the limiting flange is connected in the cylinder sleeve in a sliding and inserted mode, the limiting flange is connected to the limiting step in a clamped mode, and a first sealing ring is arranged between the limiting flange and the inner wall of the cylinder sleeve. The piston type energy accumulator provided by the utility model has the characteristics of convenience in material selection and processing while meeting the use requirements of the energy accumulator.

Description

Technical Field

[0001] The utility model relates to the field of accumulators, and more specifically, to a novel piston accumulator. Background Art

[0002] Hydraulic accumulator is an energy storage device in hydraulic and pneumatic systems. It converts the energy in the system into compression energy or potential energy and stores it at the right time. When the system needs it, it converts the compression energy or potential energy into hydraulic or air pressure energy and releases it to replenish the system. When the system pressure increases instantly, it can absorb this part of the energy to ensure the normal pressure of the entire system. Hydraulic accumulators can be divided into spring type and piston type according to the loading method. Piston accumulators are widely used in hydraulic systems because of their stable pressure.

[0003] The existing piston accumulator generally includes a cylinder sleeve, a piston installed in the cylinder sleeve, and an upper end cover and a lower end cover respectively fixed at both ends of the cylinder sleeve; the upper end cover is provided with an oil hole; the lower end cover is provided with an air filling nozzle. The installation methods of the upper end cover and the lower end cover of the existing piston accumulator, such as the publication number: CN 210371396U, which discloses an impact-resistant piston hydraulic accumulator; the publication number: CN 212744538 U, which discloses a new type of structural piston accumulator; the publication number: CN214331024 U, which discloses a piston accumulator, are all installed at both ends of the cylinder sleeve by threaded connection to meet the needs of convenient disassembly and assembly. Since the cylinder sleeve is a component that withstands high pressure and has high requirements for the inner wall of the cylinder sleeve, most of them need to be customized and purchased, which is inconvenient to select materials and has relatively high costs; if it is processed by itself, it is necessary to process the threads on both ends, so it needs to be clamped repeatedly, which is also inconvenient to process.

[0004] Therefore, it is urgent to design a novel piston accumulator. Utility Model Content

[0005] The technical problem to be solved by the utility model is to address the above-mentioned deficiencies in the prior art, and its purpose is to provide a novel piston accumulator which, while meeting the use requirements of the accumulator, has the characteristics of convenient material selection and convenient processing.

[0006] The technical solution of the utility model is as follows: a novel piston accumulator comprises a cylinder sleeve, wherein an upper end cover and a lower end cover are respectively provided at both ends of the cylinder sleeve, the lower end cover is detachably connected to the cylinder sleeve, a piston is slidably installed in the cylinder sleeve, an inner wall of one end of the cylinder sleeve close to the upper end cover is provided with a limiting step, the upper end cover comprises a round cover and a limiting flange, the limiting flange is arranged around the outer wall of the round cover, the round cover is movably inserted in a center hole formed by the inner side wall of the limiting step, the limiting flange is slidably inserted in the cylinder sleeve, and the limiting flange is clamped on the limiting step, and a first sealing ring is provided between the limiting flange and the inner wall of the cylinder sleeve.

[0007] As a further improvement, the diameter of the round cover is smaller than the diameter of the center hole, and the diameter of the limiting flange is larger than the diameter of the center hole and is matched with the diameter of the inner wall of the cylinder sleeve.

[0008] Furthermore, the upper end cover is connected to the cylinder sleeve by at least two fastening screws.

[0009] Furthermore, the fastening screw passes through the gap between the round cover and the center hole and is threadedly connected to the limiting flange.

[0010] Furthermore, an inflation joint is threadedly connected to the upper end cover, and a second sealing ring is provided between the inflation joint and the upper end cover.

[0011] Furthermore, the lower end cover is threadedly connected to the cylinder sleeve, and a third sealing ring is provided between the cylinder sleeve and the lower end cover.

[0012] Furthermore, a first groove is formed at one end of the piston facing the upper end cover, and a second groove is formed at one end of the piston facing the lower end cover. The depth of the first groove is greater than the depth of the second groove, and the diameter of the second groove is greater than the diameter of the first groove.

[0013] Furthermore, at least two guide belts are provided between the piston and the inner wall of the cylinder sleeve, and the guide belts are evenly embedded in the piston along the sliding direction of the piston.

[0014] Furthermore, a sealing assembly is provided between the piston and the inner wall of the cylinder liner, and the sealing assembly includes a support frame, a fourth sealing ring and a fifth sealing ring. The support frame is a support ring with an I-shaped cross-section, and the support frame is embedded in a recessed groove provided on the piston. The fourth sealing ring and the fifth sealing ring are respectively installed on the inner and outer sides of the support frame, and the inner wall of the fourth sealing ring is in contact with the bottom of the recessed groove of the piston, and the outer wall of the fifth sealing ring is in contact with the inner wall of the cylinder liner.

[0015] Furthermore, the cylinder sleeve is made of seamless steel pipe, the guide belt is made of high molecular weight polytetrafluoroethylene, the support frame is made of polytetrafluoroethylene, and the upper end cover is made of round steel.

[0016] Beneficial Effects

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] 1. The piston accumulator of the utility model adopts an installation method in which the upper end cover is clamped with the limiting flange and the limiting step. While meeting the use requirements of the accumulator, it has the characteristics of convenient material selection and convenient processing. In the production and processing process, it is only necessary to use a common seamless steel pipe to clamp it on a lathe, then turn out the limiting step, and then use an internal circle extrusion cutter to process the inner wall, and finally process the external thread that matches the lower end cover. The cylinder sleeve can be processed in one clamping, which greatly reduces the processing difficulty. During assembly, the upper end cover is first pushed from one end of the threaded cylinder sleeve to the other end, and then the piston is pushed into the cylinder sleeve. Finally, the upper and lower end covers are installed, which also meets the needs of convenient disassembly and maintenance.

[0019] 2. The piston of the piston accumulator of the utility model adopts multiple guide belts to guide its movement, thereby improving the coaxiality between the piston and the cylinder sleeve, ensuring smooth sliding, sealing and pressure stability of the piston; at the same time, its sealing component adopts a structure in which a support frame supports two sealing rings to form a sealing method of inner and outer sealing rings. When the outer sealing ring is worn, the inner sealing ring can push out the support frame and the outer sealing ring to eliminate the wear gap of the outer sealing ring, thereby ensuring the sealing of the piston and extending the service life of the piston accumulator. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0021] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0022] Figure 3 It is a schematic diagram of the cross-sectional structure of the cylinder sleeve in the utility model;

[0023] Figure 4 It is a schematic diagram of the cross-sectional structure of the upper end cover of the utility model;

[0024] Figure 5 It is a schematic diagram of the cross-sectional structure of the piston in the utility model;

[0025] Figure 6 for Figure 5 A schematic diagram of the enlarged structure at point A in the middle.

[0026] Among them: 1-cylinder liner, 2-upper end cover, 3-lower end cover, 4-piston, 5-first sealing ring, 6-fastening screw, 7-inflating joint, 8-second sealing ring, 9-third sealing ring, 10-first groove, 11-second groove, 12-guide belt, 13-support frame, 14-fourth sealing ring, 15-fifth sealing ring, 1a-limiting step, 1b-center hole, 2a-round cover, 2b-limiting flange. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0028] See also Figure 1-6 The utility model discloses a novel piston accumulator, comprising a cylinder liner 1, with an upper end cover 2 and a lower end cover 3 respectively arranged at both ends of the cylinder liner 1, wherein the upper end cover 2 serves as a gas side end cover of the accumulator, and the lower end cover 3 serves as an oil side end cover of the accumulator, and the lower end cover 3 is detachably connected to the cylinder liner 1 for easy disassembly and assembly, and a piston 4 is slidably installed in the cylinder liner 1 to form a piston accumulator. A limiting step 1a is provided on the inner wall of one end of the cylinder sleeve 1 close to the upper end cover 2. The limiting step 1a is a step protruding from the inner wall of the cylinder sleeve 1, which plays a role in limiting the upper end cover 2. The upper end cover 2 includes a round cover 2a and a limiting flange 2b, wherein the round cover 2a and the limiting flange 2b are an integrally formed structure with better structural strength. The limiting flange 2b is arranged around the outer wall of the round cover 2a to form an annular flange. The round cover 2a is movably inserted in the center hole 1b formed on the inner side wall of the limiting step 1a, the limiting flange 2b is slidably inserted in the cylinder sleeve 1, and the limiting flange 2b is clamped on the limiting step 1a to prevent the upper end cover 2 from separating from the cylinder sleeve 1. A first sealing ring 5 is provided between the limiting flange 2b and the inner wall of the cylinder sleeve 1 to ensure the sealing between the upper end cover 2 and the cylinder sleeve 1 and prevent gas leakage at the gas side end of the accumulator.

[0029] Preferably, the diameter of the round cover 2a is smaller than the diameter of the center hole 1b, ensuring that the round cover 2a can be inserted into the center hole 1b, the diameter of the limiting flange 2b is larger than the diameter of the center hole 1b, ensuring that the upper end cover 2 will not fall off, and the diameter of the limiting flange 2b is compatible with the diameter of the inner wall of the cylinder liner 1, thereby extending the sealing performance of the first sealing ring 5.

[0030] Preferably, the upper end cover 2 is connected to the cylinder sleeve 1 by at least two fastening screws 6, and the upper end cover 2 can be fixed on the cylinder sleeve 1. It should be noted that the piston accumulator of the utility model adopts a clamping fit between the limiting step 1a and the limiting flange 2b. When nitrogen is filled into one end of the gas side of the accumulator, due to the high pressure between the piston 4 and the upper end cover 2, the upper end cover 2 is pushed outward, so that the limiting flange 2b is close to the limiting step 1a, which can prevent the upper end cover 2 from falling off and has no effect on the use of the accumulator. Therefore, the fixing with the fastening screws 6 is not a necessary structure, and in this embodiment, the upper end cover 2 is fixed with the fastening screws 6, which can better fix the upper end cover 2 and avoid the problem that the upper end cover 2 slides into the cylinder sleeve 1 during handling or transportation of the finished product, causing inconvenience in subsequent inflation.

[0031] Preferably, the fastening screw 6 passes through the gap between the round cover 2a and the center hole 1b and is threadedly connected to the limiting flange 2b. The nut diameter of the fastening screw 6 is larger than the gap between the round cover 2a and the center hole 1b. In this way, the nut of the fastening screw 6 can be used to press the round cover 2a and the limiting step 1a, thereby achieving position locking of the upper end cover 2.

[0032] Preferably, an inflation joint 7 is threadedly connected to the upper end cover 2 to facilitate the filling of nitrogen into the cylinder liner 1, and a second sealing ring 8 is provided between the inflation joint 7 and the upper end cover 2 to ensure the sealing between the inflation joint 7 and the upper end cover 2.

[0033] Preferably, the lower end cover 3 is threadedly connected to the cylinder liner 1 to facilitate disassembly and assembly, and a third sealing ring 9 is provided between the cylinder liner 1 and the lower end cover 3 to ensure the sealing between the cylinder liner 1 and the lower end cover 3.

[0034] Preferably, a first groove 10 is provided at one end of the piston 4 facing the upper end cover 2, and the first groove 10 is coaxially arranged with the piston 4. After nitrogen is filled into the cylinder liner 1, part of the nitrogen can be filled in the first groove 10, which can ensure that the piston is coaxial with the cylinder liner 1 when the nitrogen pressure pushes the piston to slide. A second groove 11 is provided at one end of the piston 4 facing the lower end cover 3, and the second groove 11 is coaxially arranged with the piston 4. When the hydraulic oil is unloaded at one end of the oil side of the cylinder liner 1, a gap is maintained between the second groove 11 and the lower end cover 3, which facilitates the removal of the lower end cover 3. The depth of the first groove 10 is greater than the depth of the second groove 11, which increases the nitrogen filling volume. The diameter of the second groove 11 is greater than the diameter of the first groove 10. The large-diameter structure makes it easier to remove the lower end cover 3.

[0035] Preferably, at least two guide bands 12 are provided between the piston 4 and the inner wall of the cylinder liner 1, and the guide bands 12 are uniformly embedded in the piston 4 along the sliding direction of the piston 4, so as to guide the movement of the piston 4. Furthermore, a sealing assembly is also provided between the piston 4 and the inner wall of the cylinder liner 1, and the sealing assembly includes a support frame 13, a fourth sealing ring 14 and a fifth sealing ring 15, wherein the support frame 13 is a support ring with an I-shaped cross section, and the support frame 13 is embedded in a sink groove provided in the piston 4, and the fourth sealing ring 14 and the fifth sealing ring 15 are respectively installed on the inner side and the outer side of the support frame 13, forming the form of inner and outer two layers of sealing rings, and the inner wall of the fourth sealing ring 14 is in contact with the bottom of the sink groove of the piston 4, and the outer wall of the fifth sealing ring 15 is in contact with the inner wall of the cylinder liner 1.

[0036] In the piston accumulator of the present embodiment, the piston 4 adopts a plurality of guide belts 12 to guide its movement, thereby improving the coaxiality between the piston 4 and the cylinder sleeve 1, and ensuring the smooth sliding, sealing and pressure stability of the piston; at the same time, the sealing assembly adopts a structure in which a support frame 13 supports two sealing rings, forming a sealing mode of inner and outer sealing rings. When the outer sealing ring is worn, the inner sealing ring can push out the support frame and the outer sealing ring, eliminating the wear gap of the outer sealing ring, thereby ensuring the sealing of the piston and extending the service life of the piston accumulator.

[0037] Preferably, the cylinder liner 1 is made of seamless steel pipe, which meets the structural strength requirements while being more convenient to obtain and process. The guide belt 12 is made of high molecular weight polytetrafluoroethylene, which extends the service life of the guide belt 12. The support frame 13 is made of polytetrafluoroethylene, which extends its service life. The upper end cover 2 is made of round steel, which meets the structural strength requirements while being more convenient to obtain and process.

[0038] The piston accumulator of the utility model adopts the installation mode of the upper end cover 2 that the limiting flange 2b and the limiting step 1a cooperate and clamp. While meeting the use requirements of the accumulator, it has the characteristics of convenient material selection and convenient processing. In the production and processing process, it is only necessary to use a common seamless steel pipe to clamp on the lathe, then turn out the limiting step 1a, and then use the inner circle extrusion cutter to process the inner wall, and finally process the external thread that matches the lower end cover 3. The cylinder sleeve can be processed in one clamping, which greatly reduces the processing difficulty; when assembling, first push the upper end cover 2 from one end of the threaded cylinder sleeve 1 to the other end, and then push the piston 4 into the cylinder sleeve 1, and finally install the upper and lower end covers 3, which also meets the needs of convenient disassembly and maintenance. The cylinder sleeve 1, upper end cover 2, lower end cover 3, and piston 4 of the accumulator can be self-processed using existing machine tools and tool equipment, without external purchase, which can effectively reduce production costs.

[0039] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A novel piston accumulator, comprising a cylinder sleeve (1), wherein the cylinder sleeve (1) is provided with an upper end cover (2) and a lower end cover (3) at both ends, wherein the lower end cover (3) is detachably connected to the cylinder sleeve (1), and a piston (4) is slidably installed in the cylinder sleeve (1), characterized in that: A limiting step (1a) is provided on the inner wall of one end of the cylinder sleeve (1) close to the upper end cover (2); the upper end cover (2) comprises a round cover (2a) and a limiting flange (2b); the limiting flange (2b) is arranged around the outer wall of the round cover (2a); the round cover (2a) is movably inserted into a center hole (1b) formed on the inner wall of the limiting step (1a); the limiting flange (2b) is slidably inserted into the cylinder sleeve (1), and the limiting flange (2b) is clamped on the limiting step (1a); a first sealing ring (5) is provided between the limiting flange (2b) and the inner wall of the cylinder sleeve (1).

2. A novel piston accumulator according to claim 1, characterized in that: The diameter of the circular cover (2a) is smaller than the diameter of the center hole (1b), and the diameter of the limiting flange (2b) is larger than the diameter of the center hole (1b) and is compatible with the diameter of the inner wall of the cylinder sleeve (1).

3. A novel piston accumulator according to claim 2, characterized in that: The upper end cover (2) is connected to the cylinder sleeve (1) via at least two fastening screws (6).

4. A novel piston accumulator according to claim 3, characterized in that: The fastening screw (6) passes through the gap between the round cover (2a) and the central hole (1b) and is threadedly connected to the limiting flange (2b).

5. A novel piston accumulator according to claim 1, characterized in that: The upper end cover (2) is threadedly connected with an inflation joint (7), and a second sealing ring (8) is provided between the inflation joint (7) and the upper end cover (2).

6. A novel piston accumulator according to claim 1, characterized in that: The lower end cover (3) is threadedly connected to the cylinder sleeve (1), and a third sealing ring (9) is provided between the cylinder sleeve (1) and the lower end cover (3).

7. A novel piston accumulator according to claim 1, characterized in that: A first groove (10) is formed at one end of the piston (4) facing the upper end cover (2), and a second groove (11) is formed at one end of the piston (4) facing the lower end cover (3). The depth of the first groove (10) is greater than the depth of the second groove (11), and the diameter of the second groove (11) is greater than the diameter of the first groove (10).

8. A novel piston accumulator according to any one of claims 1 to 7, characterized in that: At least two guide bands (12) are provided between the piston (4) and the inner wall of the cylinder sleeve (1), and the guide bands (12) are evenly embedded in the piston (4) along the sliding direction of the piston (4).

9. A novel piston accumulator according to claim 8, characterized in that: A sealing assembly is also provided between the piston (4) and the inner wall of the cylinder sleeve (1), and the sealing assembly comprises a support frame (13), a fourth sealing ring (14) and a fifth sealing ring (15); the support frame (13) is a support ring with an I-shaped cross section, and the support frame (13) is embedded in a recessed groove provided in the piston (4); the fourth sealing ring (14) and the fifth sealing ring (15) are respectively installed on the inner side and the outer side of the support frame (13); the inner wall of the fourth sealing ring (14) contacts the bottom of the recessed groove of the piston (4), and the outer wall of the fifth sealing ring (15) contacts the inner wall of the cylinder sleeve (1).

10. A novel piston accumulator according to claim 9, characterized in that: The cylinder sleeve (1) is made of seamless steel pipe, the guide belt (12) is made of high molecular weight polytetrafluoroethylene, the support frame (13) is made of polytetrafluoroethylene, and the upper end cover (2) is made of round steel.

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