Anti-unbalance-loading nitrogen spring

Abstract

The utility model relates to the technical field of nitrogen springs, in particular to an unbalance-loading-resistant nitrogen spring which comprises a cylinder barrel, a plunger rod, a limiting sleeve, an upper supporting ring and a lower supporting ring, the upper supporting ring and the lower supporting ring are both arranged between the plunger rod and the limiting sleeve, the upper supporting ring is located above the lower supporting ring, and the lower supporting ring is located above the plunger rod. The upper supporting ring, the lower supporting ring and the plunger rod are in zero-clearance contact, and clearances are reserved between the upper supporting ring and the limiting sleeve and between the lower supporting ring and the limiting sleeve. The stability of the plunger rod is improved through the double-supporting-ring structure, the double supporting rings are in zero-clearance contact with the plunger rod, and the plunger rod is kept to stably move in the vertical direction. The gap between the limiting sleeve and the plunger rod is enlarged by adding the double supporting rings, and the situation that the limiting sleeve makes contact with the plunger rod to generate heat is avoided. The double supporting rings are made of polyformaldehyde and are soft, and friction heating is little when the double supporting rings make contact with the plunger rod. The unbalance-loading-resistant nitrogen spring can solve the technical problem that an existing nitrogen spring leaks gas.

Description

TECHNICAL FIELD

[0001] The utility model relates to nitrogen spring technical field especially relates to a nitrogen spring of anti eccentric load. BACKGROUND

[0002] The existing nitrogen spring is generally composed of a nitrogen cylinder, a limiting sleeve, a plunger rod and a sealing ring. During the processing and working of a mold, certain manufacturing errors may occur, resulting in a certain angle between the plunger rod of the nitrogen spring and the top block of the nitrogen cylinder during use. Due to the existence of the angle, the plunger rod moves at a certain angle with the cylinder body during the working of the nitrogen spring, resulting in the contact between one side of the plunger rod and the limiting sleeve with zero clearance, the deformation of the sealing ring due to the frictional heating of the plunger rod, the loss of sealing property and the leakage of the nitrogen spring.

[0003] Therefore, the existing nitrogen spring structure has the problem of nitrogen spring leakage due to the lack of anti-eccentric load capacity. SUMMARY

[0004] The utility model discloses a nitrogen spring of anti eccentric load can solve the technical problem that the existing nitrogen spring has leakage.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] The utility model discloses a nitrogen spring of anti eccentric load, including cylinder, plunger rod, limiting sleeve, upper support ring, lower support ring, the limiting sleeve sets up on the inside upper end in cylinder, the plunger rod sets up in the cavity of limiting sleeve, with the clearance reservation of limiting sleeve cavity inner wall, and the movable end of plunger rod stretches out cylinder upwards;

[0007] The upper support ring and the lower support ring are both arranged between the plunger rod and the limiting sleeve, the upper support ring is located above the lower support ring, and the upper support ring, the lower support ring and the plunger rod are in zero clearance contact.

[0008] As a preferred scheme, the upper support ring and the lower support ring are arranged at the middle part of the cavity of the limiting sleeve.

[0009] As a preferred scheme, the upper support ring is a ring structure, and the side wall of the upper support ring is provided with a notch in the axial direction.

[0010] As a preferred scheme, the lower support ring is a ring structure, and the outer diameter of the lower support ring is greater than the outer diameter of the upper support ring.

[0011] As a preferred scheme, the nitrogen spring of anti eccentric load further comprises a sealing ring, the sealing ring is arranged between the plunger rod and the limiting sleeve, and the sealing ring is located below the lower support ring.

[0012] As a preferred solution, the anti-bias nitrogen gas spring further comprises an inner dustproof ring, which is arranged between the plunger rod and the limiting sleeve, and the sealing ring is located at the opening at the top of the limiting sleeve.

[0013] As a preferred solution, the anti-bias nitrogen gas spring further comprises a steel wire retainer, which is arranged between the limiting sleeve and the cylinder.

[0014] As a preferred solution, the anti-bias nitrogen gas spring further comprises an O-ring, which is arranged between the limiting sleeve and the cylinder, and the O-ring is located below the steel wire retainer.

[0015] The anti-bias nitrogen gas spring has the advantages that:

[0016] The anti-bias nitrogen gas spring provided by the utility model can solve the technical problem of air leakage of the existing nitrogen gas spring.

[0017] (1) The double support ring structure can reduce the axial swing of the plunger rod, increase the stability of the plunger rod, and keep the plunger rod in stable vertical movement.

[0018] (2) The double support ring is used to increase the gap between the limiting sleeve and the plunger rod, so that the limiting sleeve and the plunger rod are prevented from being in contact and generating heat.

[0019] (3) The double support ring is made of polyoxymethylene, which is relatively soft and generates less friction heat when in contact with the plunger rod. DRAWINGS

[0020] Figure 1 The utility model discloses a sectional view schematic drawing.

[0021] Figure 2 The utility model discloses a sectional view schematic drawing.

[0022] Figure 3 The utility model discloses a sectional view schematic drawing.

[0023] DRAWINGS

[0024] l-cylinder, 2-plunger rod, 3-limiting sleeve, 4-upper support ring, 4l-gap, 5-lower support ring, 6-sealing ring, 7-inner dustproof ring, 8-steel wire retainer, 9-O-ring. DETAILED DESCRIPTION

[0025] To make the technical problems solved by the utility model, the technical scheme adopted and the technical effects reached more clear, the technical scheme of the utility model will be further explained below in combination with the drawings and through specific embodiments.It can be understood that the specific embodiments described herein are only used to explain the utility model, not limit the utility model.In addition, it also needs to be explained that, for the convenience of description, only the parts related to the utility model are shown in the drawings, not all.

[0026] In the description of the utility model, it needs to be explained that, the orientation or position relation indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relation shown in the drawings, only for the convenience of describing the utility model and simplifying the description, not to indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation to the utility model.In addition, the terms "first", "second" are only for the purpose of description, not to be understood as indicating or implying relative importance.Among them, the terms "first position" and "second position" are two different positions.

[0027] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, also can be detachable connection;It can be mechanical connection, also can be electrical connection;It can be directly connected, also can be indirectly connected through intermediate medium, it can be the communication inside two elements.The above-mentioned terms in the utility model can be understood according to specific circumstances by those skilled in the art.

[0028] The utility model provides a kind of anti-bias load nitrogen gas spring, nitrogen gas spring's anti-bias load capacity can be solved, nitrogen gas spring can also work normally under certain bias angle.

[0029] The utility model increases two support rings between the limiting sleeve and plunger rod of nitrogen gas spring, and two support rings and plunger rod are in zero clearance contact, plunger rod is changed into double support ring support by double support ring structure supporting plunger rod movement, plunger rod is changed into double support ring support, the gap between limiting sleeve and plunger rod is increased simultaneously, when plunger rod is subjected to horizontal direction thrust, double support ring can effectively support plunger rod, so that plunger rod keeps vertical movement, avoid plunger rod to occur deviation and limiting sleeve contact.

[0030] The support ring is made of polyformaldehyde material, avoids steel contact with the plunger rod, guarantees vertical movement of the plunger rod, reduces heat generated by friction between the support ring and the plunger rod, effectively prevents heat from affecting the sealing ring, and causes the sealing ring to fail.

[0031] As shown in Figure 1 The utility model relates to a kind of nitrogen gas springs of eccentric load resistance, including cylinder 1, plunger rod 2, limit sleeve 3, upper support ring 4, lower support ring 5, sealing ring 6, inner dustproof ring 7, steel wire baffle 8, O-ring 9.

[0032] Cylinder l inside is hollow cylinder, plunger rod 2 is linear reciprocating motion in vertical direction in cylinder l.

[0033] Limit sleeve 3 is set on the inside upper end of cylinder 1, plunger rod 2 is set in the cavity of limit sleeve 3, and the movable end of plunger rod 2 is stretched out cylinder 1 upwards;Limit sleeve 3 is internally hollow structure, upper support ring 4 and lower support ring 5 are set in the internal cavity of limit sleeve 3, upper support ring 4 is installed in the upper position inside the cavity of limit sleeve 3, and is zero clearance with plunger rod 2;Lower support ring 5 is installed in the lower position inside the cavity of limit sleeve 3, and is supported plunger rod 2 with upper support ring 4, guaranteeing plunger rod 2 reciprocating motion in cylinder l.

[0034] As shown in Figure 2 , 3 Upper support ring 4 and lower support ring 5 are both set between plunger rod 2 and limit sleeve 3, upper support ring 4 is located above lower support ring 5, upper support ring 4 and lower support ring 5 are zero clearance with plunger rod 2, and gap is reserved between limit sleeve 3 and plunger rod 2. Upper support ring 4 and lower support ring 5 are spaced apart and set in the middle of the cavity of limit sleeve 3. Upper support ring 4 is annular structure, and the side wall of upper support ring 4 is provided with notches 41 along the axial direction, to facilitate the installation of upper support ring 4 outside plunger rod 2, as shown in Figure 3 Lower support ring 5 is annular structure, and the outer diameter of lower support ring 5 is greater than the outer diameter of upper support ring 4.

[0035] Sealing ring 6 is set between plunger rod 2 and limit sleeve 3, and sealing ring 6 is located below lower support ring 5. Sealing ring 6 is installed inside limit sleeve 3, located below lower support ring 5, and is in contact with plunger rod 2, to play a sealing role, for sealing high-pressure gas in cylinder l.

[0036] Inner dustproof ring 7 is set between plunger rod 2 and limit sleeve 3, and sealing ring 6 is located at the top opening of limit sleeve 3. Inner dustproof ring 7 is used to prevent external dust and impurities from entering cylinder l.

[0037] The steel wire check ring 8 is arranged between the limiting sleeve 3 and the cylinder barrel 1.

[0038] The O-shaped ring 9 is arranged between the limiting sleeve 3 and the cylinder barrel 1, and the O-shaped ring 9 is below the steel wire check ring 8.

[0039] The utility model has the advantages of:

[0040] (1) The double support ring structure is in contact with the plunger rod with zero clearance, and the plunger rod is kept in stable vertical movement.

[0041] (2) The gap between the limiting sleeve and the plunger rod is increased to avoid contact heat.

[0042] (3) The support ring is made of polyformaldehyde, which is in contact with the plunger rod and generates less friction heat.

[0043] The above-mentioned embodiments only express several implementation manners of the utility model, and the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent scope. It should be pointed out that, for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A nitrogen gas spring with anti-eccentric loading, characterized in that: Includes cylinder (1), piston rod (2), limiting sleeve (3), upper support ring (4), and lower support ring (5). The limiting sleeve (3) is located on the upper inner side of the cylinder (1). The piston rod (2) is located in the cavity of the limiting sleeve (3) with a pre-reserved gap between it and the inner wall of the cavity of the limiting sleeve (3). The movable end of the piston rod (2) extends upward out of the cylinder (1). The upper support ring (4) and the lower support ring (5) are both located between the plunger rod (2) and the limiting sleeve (3). The upper support ring (4) is located above the lower support ring (5). The upper support ring (4), the lower support ring (5) and the plunger rod (2) are in zero-gap contact.

2. The anti-eccentric nitrogen spring according to claim 1, characterized in that: The upper support ring (4) and the lower support ring (5) are spaced apart in the middle of the cavity of the limiting sleeve (3).

3. The anti-eccentric nitrogen spring according to claim 2, characterized in that: The upper support ring (4) is a ring structure, and the side wall of the upper support ring (4) is provided with a notch (41) along the axial direction.

4. The anti-eccentric nitrogen spring according to claim 3, characterized in that: The lower support ring (5) is a ring structure, and the outer diameter of the lower support ring (5) is larger than the outer diameter of the upper support ring (4).

5. A nitrogen gas spring for resisting off-center loading according to any one of claims 1 to 4, characterized in that: The anti-eccentric nitrogen spring also includes a sealing ring (6), which is disposed between the plunger rod (2) and the limiting sleeve (3), and is located below the lower support ring (5).

6. The anti-eccentric nitrogen spring according to claim 5, characterized in that: The anti-eccentric nitrogen spring also includes an inner dustproof ring (7), which is disposed between the plunger rod (2) and the limiting sleeve (3), and the sealing ring (6) is located at the top opening of the limiting sleeve (3).

7. The anti-eccentric nitrogen spring according to claim 6, characterized in that: The anti-eccentric nitrogen spring also includes a wire retaining ring (8), which is disposed between the limiting sleeve (3) and the cylinder (1).

8. The anti-eccentric nitrogen spring according to claim 7, characterized in that: The anti-eccentric nitrogen spring also includes an O-ring (9), which is disposed between the limiting sleeve (3) and the cylinder (1), and is located below the wire retaining ring (8).

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