Sealed nitrogen spring

Abstract

The utility model discloses a sealed nitrogen spring, and relates to the field of pneumatic springs. The sealing type nitrogen spring comprises a sealing seat and a piston piece, a gas inlet piece is arranged at the bottom of the sealing seat, the sealing seat comprises a cylinder body and a flexible sealing sleeve, and a spring clamp is installed between the cylinder body and the flexible sealing sleeve; the piston piece comprises a piston head and a positioning baffle ring, the piston head is arranged in the flexible sealing sleeve in a sliding mode, and the positioning baffle ring is arranged in the cylinder body in a sliding mode. The sealing type nitrogen spring and the positioning baffle ring slide along the inner wall of the air pressure cavity so as to position the piston head and prevent the piston head from deflecting, meanwhile, the spring clamp is clamped between the cylinder body and the flexible sealing sleeve, so that the flexible sealing sleeve and the cylinder body are fixed together, and meanwhile, the flexible sealing sleeve has the tendency of shrinking towards the middle under the action of the spring clamp, so that the piston head is prevented from deflecting. And the flexible sealing sleeve does not need to move up and down along with the piston head, so that the sealing effect is effectively prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to pneumatic spring technical field, concretely is a sealed nitrogen spring. BACKGROUND

[0002] Nitrogen spring is a kind of piston type spring, by filling nitrogen in cylinder, so that piston piece can compress nitrogen when moving to cylinder interior, with gas compression, its pressure increases, thereby playing the counterthrust to piston, make piston deceleration, simultaneously, piston and cylinder sealing piece between through flexible material play sealing and increase friction effect.

[0003] Now the common nitrogen spring on market is usually directly sealed piece is installed on piston, sealing piece long-term up and down movement and cylinder wall carry out friction, make sealing piece outer surface appear abrasion, simultaneously, piston piece up and down movement process lacks the positioning of avoiding, make piston rod sliding track deviates cylinder axis, time is long, will make the assembly gap between sealing piece and cylinder increase, thereby lead to sealing failure, for this, specially provide a sealed nitrogen spring. UTILITY MODEL CONTENT

[0004] In view of the deficiency of prior art, the utility model provides a sealed nitrogen spring, solves the problems that the existing nitrogen spring is usually directly sealed piece is installed on piston, sealing piece long-term up and down movement and cylinder wall carry out friction, make sealing piece outer surface appear abrasion, simultaneously, piston piece up and down movement process lacks the positioning of avoiding, make piston rod sliding track deviates cylinder axis, time is long, will make the assembly gap between sealing piece and cylinder increase, thereby lead to sealing failure.

[0005] To realize above-mentioned purpose, the utility model is realized through following technical scheme: a sealed nitrogen spring, including seal seat and piston piece that is slidably arranged in seal seat, the bottom of seal seat is provided with inlet piece, seal seat includes cylinder and flexible sealing sleeve that is assembled in the inside of the top end of cylinder, spring clamp is installed between cylinder and flexible sealing sleeve;

[0006] The piston piece includes piston head and positioning baffle ring that is screw-connected to the bottom of the piston head, the piston head is slidably arranged in the flexible sealing sleeve, and the positioning baffle ring is slidably arranged in the inside of cylinder for limiting the up and down movement range of the piston head.

[0007] Preferably, a gas pressure chamber is formed in the inside of the cylinder, the positioning baffle ring is slidably arranged in the inside of the gas pressure chamber, and a through hole is formed in the outer wall of the positioning baffle ring.

[0008] Preferably, a connecting column is arranged on the top of the piston head, a threaded column is fixedly welded to the bottom end of the connecting column, and the threaded column is screw-connected to the inner top of the piston head.

[0009] Preferably, the top of the cylinder is fixedly provided with a gland plate, and the connecting column is movably penetrated through the gland plate.

[0010] Preferably, the inner bottom of the air pressure chamber is provided with an air inlet channel, and the air inlet member is arranged inside the bottom end of the air inlet channel.

[0011] Preferably, the air inlet member comprises a high-pressure air valve fixedly arranged in the air inlet channel, and the outer end of the high-pressure air valve is movably provided with a sealing plug, and the outer end of the air inlet channel is threadedly connected with a fixed screw rod, and the inner end of the fixed screw rod extrudes the sealing plug to tightly adhere to the end of the high-pressure air valve.

[0012] Preferably, the bottom of the cylinder is provided with a mounting hole, and the lower end of the side wall of the cylinder is provided with an annular groove, and the outer end of the air inlet channel is arranged in the annular groove.

[0013] The utility model discloses a sealed nitrogen spring, which has the following beneficial effects: the bottom end of the piston head is provided with a positioning baffle ring, the positioning baffle ring slides along the inner wall of the air pressure chamber, thereby positioning the piston head and preventing it from being inclined, and the spring clamp is clamped between the cylinder and the flexible sealing sleeve, so that the flexible sealing sleeve and the cylinder are fixed together, and under the action of the spring clamp, the flexible sealing sleeve has a tendency to contract to the middle part, so that it can always embrace the outer surface of the piston head, so that in use, the flexible sealing sleeve does not need to move up and down with the piston head, and always keeps close to the piston head, thereby effectively prolonging the sealing effect. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0015] Fig. 1 It is the whole outer surface structure schematic diagram of the utility model;

[0016] Fig. 2 It is the whole bottom structure schematic diagram of the utility model;

[0017] Fig. 3 It is the cylinder internal structure sectional view of the utility model.

[0018] In the figure: 1, sealing seat; 11, cylinder body; 12, mounting hole; 13, annular groove; 14, air inlet channel; 15, air pressure chamber; 16, flexible sealing sleeve; 17, spring clamp; 18, gland plate; 2, piston piece; 21, connecting column; 22, piston head; 23, threaded column; 24, positioning stop ring; 25, through hole; 3, air inlet piece; 31, high-pressure air valve; 32, sealing plug; 33, fixing screw rod. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model more clear, the technical scheme in the embodiments of the utility model is clearly and completely described, obviously, the described embodiments are part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0020] The sealing type nitrogen gas spring provided by the embodiments of the application solves the problem that the existing nitrogen gas spring is usually directly installed with a sealing element on a piston, the sealing element is moved up and down for a long time to rub against a cylinder wall, the outer surface of the sealing element is abraded, and the assembly gap between the sealing element and the cylinder body is increased for a long time, thereby causing sealing failure.

[0021] In order to better understand the above technical scheme, the above technical scheme will be described in detail below in combination with the drawings of the specification and specific embodiments.

[0022] The utility model discloses a sealing type nitrogen gas spring.

[0023] According to the drawings Figs. 1-3 As shown in the figure, including sealing seat 1 and piston piece 2 that slide in sealing seat 1, the bottom of sealing seat 1 is provided with air inlet piece 3, sealing seat 1 includes cylinder body 11 and flexible sealing sleeve 16 assembled in the inside of the top end of cylinder body 11, spring clamp 17 is installed between cylinder body 11 and flexible sealing sleeve 16;

[0024] Piston piece 2 includes piston head 22 and positioning stop ring 24 that is screwed to the bottom of piston head 22, piston head 22 is slidably arranged in flexible sealing sleeve 16, and positioning stop ring 24 is slidably arranged in the inside of cylinder body 11 for limiting the up-down movement range of piston head 22.

[0025] The inside of cylinder body 11 is provided with air pressure chamber 15, positioning stop ring 24 is slidably arranged in the inside of air pressure chamber 15, the outer wall of positioning stop ring 24 is provided with through hole 25, and positioning stop ring 24 is slidably arranged in close contact with the inner wall of air pressure chamber 15, so as to play a positioning role on piston head 22, so that it will not be deflected, and positioning stop ring 24 moves up and down in the inside of cylinder body 11, thereby limiting the up-down sliding distance of piston head 22.

[0026] The top of the piston head 22 is provided with a connecting column 21, the bottom end of the connecting column 21 is fixedly welded with a threaded column 23, the threaded column 23 is threadedly connected in the inner top of the piston head 22, the top of the cylinder body 11 is fixedly installed with a gland plate 18, the connecting column 21 is movably penetrated through the gland plate 18, effectively preventing the flexible sealing sleeve 16 from sliding upward, at the same time, limiting the connecting column 21, avoiding the piston head 22 from sliding upward.

[0027] The inner bottom of the air pressure chamber 15 is provided with an air inlet channel 14, the air inlet member 3 is installed in the inner bottom of the air inlet channel 14, for injecting nitrogen into the air pressure chamber 15, the air inlet member 3 comprises a high-pressure air valve 31 fixedly installed in the air inlet channel 14, the outer end of the high-pressure air valve 31 is movably provided with a sealing plug 32, the outer end of the air inlet channel 14 is threadedly connected with a fixed screw rod 33, the inner end of the fixed screw rod 33 extrudes the sealing plug 32 to tightly adhere to the end of the high-pressure air valve 31, so that the sealing plug 32 blocks the outer end of the high-pressure air valve 31, effectively avoiding the leakage of the gas injection end.

[0028] The bottom of the cylinder body 11 is provided with a mounting hole 12, the lower end side wall of the cylinder body 11 is provided with an annular groove 13, the outer end of the air inlet channel 14 is in the annular groove 13, so that the outer end of the fixed screw rod 33 is retracted in the outer wall of the cylinder body 11, thereby avoiding the contact with the fixed screw rod 33 from rotating during use, thereby affecting the sealing effect.

[0029] Working principle; the device is provided with a positioning baffle ring 24 at the bottom end of the piston head 22, the positioning baffle ring 24 slides along the inner wall of the air pressure chamber 15, thereby positioning the piston head 22, preventing it from being deflected, at the same time, the spring clamp 17 is clamped between the cylinder body 11 and the flexible sealing sleeve 16, so that the flexible sealing sleeve 16 is fixed with the cylinder body 11, at the same time, under the action of the spring clamp 17, the flexible sealing sleeve 16 has a tendency to contract to the middle part, so that it can always embrace the outer surface of the piston head 22, so that in use, the flexible sealing sleeve 16 does not need to move up and down with the piston head 22, while always keeping close to the piston head 22, thereby effectively prolonging the sealing effect.

[0030] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above examples, the above examples and descriptions in the specification are only to illustrate the principles of the present application, without departing from the spirit and scope of the present application, the present application will have various changes and improvements, these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A sealed nitrogen spring comprising a seal seat (1) and a piston member (2) slidingly arranged in the seal seat (1), a bottom of the seal seat (1) is provided with an air inlet member (3), characterized in that, The sealing seat (1) comprises a cylinder (11) and a flexible sealing sleeve (16) assembled inside the top end of the cylinder (11), and a spring clamp (17) is installed between the cylinder (11) and the flexible sealing sleeve (16); The piston piece (2) comprises a piston head (22) and a positioning stop ring (24) threadedly connected to the bottom of the piston head (22), the piston head (22) is slidingly arranged in the flexible sealing sleeve (16), and the positioning stop ring (24) is slidingly arranged in the inside of the cylinder (11) to limit the up-down movement range of the piston head (22).

2. The sealed nitrogen gas spring of claim 1, wherein: The inside of the cylinder (11) is provided with a gas pressure chamber (15), the positioning stop ring (24) is slidingly arranged in the inside of the gas pressure chamber (15), and the outer wall of the positioning stop ring (24) is provided with a through hole (25).

3. The sealed nitrogen gas spring of claim 1, wherein: The top of the piston head (22) is provided with a connecting column (21), the bottom end of the connecting column (21) is fixedly welded with a threaded column (23), and the threaded column (23) is threadedly connected to the inner top of the piston head (22).

4. The sealed nitrogen gas spring of claim 3, wherein: The top of the cylinder (11) is fixedly provided with a gland plate (18), and the connecting column (21) is movably penetrated through the gland plate (18).

5. The sealed nitrogen gas spring of claim 2, wherein: The inner bottom of the gas pressure chamber (15) is provided with an air inlet channel (14), and the air inlet piece (3) is installed in the inside of the bottom end of the air inlet channel (14).

6. The sealed nitrogen gas spring of claim 5, wherein: The air inlet piece (3) comprises a high-pressure gas valve (31) fixedly installed in the air inlet channel (14), the outer end of the high-pressure gas valve (31) is movably provided with a sealing plug (32), the outer end of the air inlet channel (14) is threadedly connected with a fixed screw rod (33), and the inner end of the fixed screw rod (33) extrudes the sealing plug (32) to tightly adhere to the end of the high-pressure gas valve (31).

7. The sealed nitrogen gas spring of claim 6, wherein: The bottom of the cylinder (11) is provided with a mounting hole (12), the lower end side wall of the cylinder (11) is provided with an annular groove (13), and the outer end of the air inlet channel (14) is located in the annular groove (13).

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