Overpressure prevention structure of nitrogen spring

Abstract

The utility model relates to the technical field of overpressure protection of nitrogen springs, and discloses an anti-overpressure structure of a nitrogen spring, which comprises a cylinder body, a lining is arranged at the top end in the cylinder body, a piston rod penetrates through the lining, and the bottom end of the piston rod extends into the cylinder body. According to the utility model, through the action of the buffer ring, the friction action between the piston rod and the cylinder body is increased, and then the downward pressing rate of the piston rod is reduced to a certain extent, so that the rapid downward pressing impact of the piston rod is reduced, and the over-pressure damage of the cylinder body is reduced; when the piston rod is continuously pressed downwards in the cylinder body, the ball can be extruded, the pull rope pulls the pressure relief plate to generate a certain overturning effect, so that compressed gas in the cylinder body is subjected to overpressure discharge, and due to the special structure of the L-shaped pressure relief channel, the smoothness of pressure relief is ensured, and the service life of the whole cylinder body is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of nitrogen spring overpressure protection, in particular to an overpressure protection structure of a nitrogen spring. Background Art

[0002] A nitrogen spring is a component with elastic function. It seals high-pressure nitrogen in a certain container. External force compresses the nitrogen through the plunger rod. When the external force is removed, the high-pressure nitrogen expands to obtain a certain elastic force. This component is called a nitrogen cylinder or gas spring, or nitrogen spring for short.

[0003] Chinese patent authorization announcement number CN 220566477 U discloses a nitrogen spring overpressure protection structure, including a tank body, the inner wall of the tank body is slidably connected with a pressure plate, the top of the pressure plate is provided with a through hole, and both sides of the top of the pressure plate are provided with a notch, and both sides of the inner wall of the tank body are fixedly installed with a fixed block, and the top of the fixed block is fixedly connected with a damper, and the pressure plate moves downward, driving the pressure column to press down, so that the sealing plate is separated from the pressure relief hole, and then the internal pressure can be relieved, and at the same time, it is ensured that the nitrogen spring will not be damaged due to excessive pressure. The above-mentioned prior art scheme has the following shortcomings: the overpressure protection of the nitrogen spring mainly relies on the descent of the sealing plate to realize the passage of the pressure relief hole, and then achieve the pressure relief effect, but because the bottom end of the tank body of the nitrogen spring needs to be installed in contact with other objects during actual use, it is easy to hinder the downward movement of the sealing plate in the structure, and at the same time affect the connection between the pressure relief hole and the outside air, thereby affecting its pressure relief effect, so there is a certain room for improvement. Utility Model Content

[0004] The utility model aims to provide an overpressure prevention structure for a nitrogen spring, so as to solve the problem that the existing overpressure prevention structure for a nitrogen spring proposed in the above background technology easily causes poor pressure relief.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an anti-overpressure structure of a nitrogen spring, comprising a cylinder body, a bushing is arranged at the top of the inner part of the cylinder body, and a piston rod is penetrated inside the bushing, the bottom end of the piston rod extends to the inside of the cylinder body, a cross pressure plate is welded to the bottom end of the piston rod, a buffer ring is evenly installed at the bottom end of the inner wall of the cylinder body below the piston rod, and a plurality of buffer rings are arranged, an inflation channel is opened at the bottom end of the inner part of the cylinder body, and an inflation valve is arranged inside the inflation channel, L-shaped pressure relief channels are opened on both sides of the bottom end of the inner part of the cylinder body, and a relief valve is installed at the top end of the inner part of the L-shaped pressure relief channel. The pressure plate, the inner wall of the L-shaped pressure relief channel below the pressure relief plate is installed with a magnet, and the top of the magnet and the bottom of the pressure relief plate attract and fit each other, and the top of the cylinder body is provided with a pressure relief starting mechanism, so that when the piston rod is over-pressured downward, it can drive the pressure relief plate to flip over, thereby releasing pressure, and the top of both sides of the cylinder body are provided with a limited locking mechanism, and the outer side of the piston rod on one side of the limited locking mechanism is correspondingly provided with a locking groove, and the outer sleeve of the piston rod above the locking groove is provided with a flexible locking ring, and the maximum compression distance of the piston rod is limited by the limited locking mechanism to further avoid overpressure of the piston rod.

[0006] Preferably, the pressure relief starting mechanism includes support plates installed on both sides of the bottom end of the cylinder body, and the top ends of the two support plates are connected to support rings, the top ends of the support rings are installed with balls, and the top ends of both sides of the balls are installed with pull ropes, and one end of the pull rope is connected to one side of the top of the pressure relief plate.

[0007] Preferably, the inner diameter of the support ring decreases from top to bottom, the diameter of the ball is greater than the minimum inner diameter of the support ring, and the pull rope is located on the side of the top of the pressure relief plate close to the magnet.

[0008] Preferably, one side of the pressure relief plate forms a flip structure with the L-shaped pressure relief channel through a connecting shaft, and a sealing sleeve is provided on the outside of the pressure relief plate to increase the sealing between the pressure relief plate and the L-shaped pressure relief channel, and the magnet is located on the side of the bottom end of the pressure relief plate away from the connecting shaft.

[0009] Preferably, the buffer ring is provided with a piston rod, the buffer rings are distributed at equal intervals on the inner wall of the cylinder body, the inner diameter of the buffer ring gradually increases from top to bottom, and the inner diameter of the buffer ring is smaller than the outer diameter of the bottom end of the piston rod.

[0010] Preferably, the limit locking mechanism includes a flip plate installed on the top of one side of the cylinder body, and a spring is installed on the top of the flip plate close to the piston rod, and one end of the spring is connected to the outer wall of the cylinder body, a pressure plate is installed on one side of the flip plate above the spring, and a roller is installed on the top of the pressure plate close to the piston rod, and one side of the roller is against the outer wall of the piston rod.

[0011] Preferably, the angle between the flip plate and the pressure plate is an obtuse angle, and the spring generates an inward pulling force on the flip plate to ensure that the roller always presses against the outer wall of the piston rod.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] (1) The friction between the piston rod and the cylinder body is increased by the buffer ring, and then the downward pressure rate of the piston rod is reduced to a certain extent, thereby reducing the rapid downward pressure impact of the piston rod and reducing the over-pressure damage of the cylinder body. In addition, by using the cooperation between the pressure relief start mechanism and the cross pressure plate, when the piston rod is continuously pressed down inside the cylinder body, it can squeeze the ball and press it under the support ring, so that the pull rope pulls the pressure relief plate to produce a certain flipping effect, so that the compressed gas inside the cylinder body can be discharged by over-pressure through the L-shaped pressure relief channel to prevent the cylinder body from bursting due to excessive gas pressure inside the cylinder body. In addition, due to the special structure of the L-shaped pressure relief channel, the smoothness of the pressure relief is guaranteed, thereby improving the overall service life of the cylinder body;

[0014] (2) The spring is used to ensure that the roller is always in contact with the outer wall of the piston rod. The pressure plate exerts a pressure on the piston rod to increase the resistance of the piston rod during its downward movement, thereby further avoiding the rapid downward impact of the piston rod. The roller and the locking groove are engaged with each other, and the flexible locking ring is used to block the maximum downward distance of the piston rod, thereby further avoiding excessive compression of the gas inside the cylinder due to excessive pressure of the piston rod, thereby further preventing damage to the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a schematic diagram of the main cross-sectional structure of the utility model;

[0017] Figure 2 It is a three-dimensional structural diagram of the pressure relief starting mechanism of the utility model;

[0018] Figure 3 This is a schematic diagram of the three-dimensional structure of the support ring of the utility model;

[0019] Figure 4 It is a schematic diagram of the three-dimensional structure of the limit locking mechanism of the utility model.

[0020] Explanation of the reference numerals in the figure: 1. Cylinder body; 2. Bushing; 3. Piston rod; 4. Limit locking mechanism; 401. Flip plate; 402. Pressure plate; 403. Roller; 404. Spring; 5. Buffer ring; 6. Pressure relief starting mechanism; 601. Support plate; 602. Support ring; 603. Ball; 604. Pull rope; 7. L-shaped pressure relief channel; 8. Pressure relief plate; 9. Inflation valve; 10. Inflation channel; 11. Locking groove; 12. Magnet; 13. Cross pressure plate; 14. Flexible locking ring. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-Figure 4 The utility model provides an embodiment: an overpressure prevention structure of a nitrogen spring, comprising a cylinder body 1, a bushing 2 is arranged at the top of the cylinder body 1, and a piston rod 3 is passed through the bushing 2, the bottom end of the piston rod 3 extends to the inside of the cylinder body 1, a cross pressure plate 13 is welded to the bottom end of the piston rod 3, and a buffer ring 5 is evenly installed at the bottom end of the inner wall of the cylinder body 1 below the piston rod 3;

[0023] The buffer ring 5 is provided with 3 piston rods, and the buffer rings 5 ​​are distributed at equal intervals on the inner wall of the cylinder body 1. The inner diameter of the buffer ring 5 gradually increases from top to bottom, and the inner diameter of the buffer ring 5 is smaller than the outer diameter of the bottom end of the piston rod 3;

[0024] Specifically, Figure 1 As shown, when in use, the buffer ring 5 is used to provide a certain buffering effect on the falling of the piston rod 3, so as to slow down the falling speed of the piston rod 3 and reduce its falling impact, so as to prevent the internal gas of the cylinder body 1 from being compressed too quickly and causing expansion;

[0025] A plurality of buffer rings 5 ​​are provided, an air charging channel 10 is provided at the bottom of the cylinder body 1, and an air charging valve 9 is provided inside the air charging channel 10, L-shaped pressure relief channels 7 are provided on both sides of the bottom of the cylinder body 1, and pressure relief plates 8 are installed at the top of the L-shaped pressure relief channels 7;

[0026] One side of the pressure relief plate 8 forms a flip structure with the L-shaped pressure relief channel 7 through a connecting shaft, and a sealing sleeve is provided on the outside of the pressure relief plate 8 to increase the sealing between the pressure relief plate 8 and the L-shaped pressure relief channel 7. The magnet 12 is located on the side of the bottom end of the pressure relief plate 8 away from the connecting shaft;

[0027] The inner wall of the L-shaped pressure relief channel 7 below the pressure relief plate 8 is installed with a magnet 12, and the top of the magnet 12 and the bottom of the pressure relief plate 8 are attracted and fit each other. The top of the cylinder body 1 is provided with a pressure relief start mechanism 6, so that when the piston rod 3 is over-pressured downward, the pressure relief plate 8 can be driven to flip, thereby releasing pressure;

[0028] The pressure relief start mechanism 6 includes support plates 601 installed on both sides of the bottom end of the cylinder body 1, and the tops of the two support plates 601 are connected to support rings 602, the tops of the support rings 602 are installed with balls 603, and the tops of both sides of the balls 603 are installed with pull ropes 604, and one end of the pull rope 604 is connected to one side of the top of the pressure relief plate 8;

[0029] The inner diameter of the support ring 602 decreases from top to bottom, the diameter of the ball 603 is greater than the minimum inner diameter of the support ring 602, and the pull rope 604 is located on the top of the pressure relief plate 8 near the magnet 12;

[0030] Specifically, Figure 1 , Figure 2 and Figure 3 As shown, when in use, the support ring 602 is used to pre-fix the position of the ball 603 to ensure that the pull rope 604 is in a taut state. When the piston rod 3 falls to the pre-overpressure distance, it squeezes the ball 603 downward to adjust the position of the ball 603, so that it generates a pulling force on the pull rope 604, and then the pull rope 604 pulls the pressure relief plate 8 to flip upward, so as to discharge the multi-pressure gas outward and reduce the pressure;

[0031] The top ends of both sides of the cylinder body 1 are provided with limited locking mechanisms 4;

[0032] The limit locking mechanism 4 includes a flip plate 401 installed at the top of one side of the cylinder body 1, and a spring 404 is installed at the top of the flip plate 401 close to the piston rod 3, and one end of the spring 404 is connected to the outer wall of the cylinder body 1, and a pressure plate 402 is installed on one side of the flip plate 401 above the spring 404, and a roller 403 is installed on the top of the pressure plate 402 close to the piston rod 3, and one side of the roller 403 is against the outer wall of the piston rod 3;

[0033] The included angle between the flip plate 401 and the pressing plate 402 is an obtuse angle, and the spring 404 generates an inward pulling force on the flip plate 401 to ensure that the roller 403 always presses against the outer wall of the piston rod 3;

[0034] A locking groove 11 is correspondingly provided on the outer side of the piston rod 3 on one side of the limit locking mechanism 4, and a flexible locking ring 14 is sleeved on the outer side of the piston rod 3 above the locking groove 11. The limit locking mechanism 4 is used to limit the maximum compression distance of the piston rod 3 to further avoid overpressure of the piston rod 3.

[0035] Specifically, Figure 1 , Figure 4 As shown, when in use, the elastic effect of the spring 404 is utilized to make the roller 403 always abut against the outer wall of the piston rod 3, and cooperate with the locking groove 11 and the flexible locking ring 14 to further limit the falling distance of the piston rod 3, so as to further prevent it from being over-pressurized and causing the cylinder body 1 to burst.

[0036] Working principle: When the utility model is in use, first, when the piston rod 3 is moved downward by pressure, the bottom end of the piston rod 3 first contacts the uppermost buffer ring 5 as it falls. Since the inner diameter of the buffer ring 5 is smaller than the outer diameter of the bottom end of the piston rod 3, and since the buffer ring 5 is made of a flexible material, a certain buffering effect is then exerted on the downward pressure of the piston rod 3, so as to reduce the downward pressure speed of the piston rod 3, so as to avoid the piston rod 3 from being pressed down too quickly, and reduce the excessive compression of the gas inside the cylinder body 1;

[0037] Secondly, when the piston rod 3 is pressed down to a certain extent, it drives the cross pressure plate 13 to contact the top of the ball 603, and uses the downward pressure to make the cross pressure plate 13 penetrate the inside of the support ring 602, so that the top of the ball 603 moves to the bottom of the support ring 602, and then the ball 603 drives the pull rope 604 to produce a certain inward pull, so that the other end of the pull rope 604 pulls the pressure relief plate 8 to flip upward, so that the bottom end of the pressure relief plate 8 and the top of the magnet 12 are separated from each other, so that the L-shaped pressure relief channel 7 is connected with the inside of the cylinder body 1, so as to produce a self-draining effect on the compressed gas inside the cylinder body 1 when it is about to be over-pressurized, so as to help reduce the pressure inside the cylinder body 1 and prevent the cylinder body 1 from bursting;

[0038] Finally, during the downward pressing process of the piston rod 3, due to the elastic effect of the spring 404, the top of the flip plate 401 is pulled closer to the piston rod 3, and then the roller 403 is always in contact with the outer wall of the piston rod 3. When the cylinder body 1 is in the process of depressurization, the roller 403 is just stuck into the inside of the locking groove 11, and the flexible locking ring 14 is used to prevent the pressure plate 402 from continuing to move along the outer wall of the piston rod 3, thereby avoiding further downward pressing of the piston rod 3, preventing the piston rod 3 from exceeding the preset stroke and causing damage to the cylinder body 1, thereby improving the protection of the cylinder body 1.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative effort.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. An overpressure prevention structure of a nitrogen spring, comprising a cylinder (1), characterized in that: A bushing (2) is provided at the top end of the cylinder body (1), and a piston rod (3) is passed through the inside of the bushing (2). The bottom end of the piston rod (3) extends into the inside of the cylinder body (1). A cross pressure plate (13) is welded to the bottom end of the piston rod (3). Buffer rings (5) are evenly installed at the bottom end of the inner wall of the cylinder body (1) below the piston rod (3), and a plurality of buffer rings (5) are provided. An inflation channel (10) is provided at the bottom end of the cylinder body (1), and an inflation valve (9) is provided inside the inflation channel (10). L-shaped pressure relief channels (7) are provided on both sides of the bottom end of the cylinder body (1), and a pressure relief plate (8) is installed at the top end of the L-shaped pressure relief channel (7). The L-shaped pressure relief channel (10) below the pressure relief plate (8) is provided with a pressure relief valve (9). 7) are installed with magnets (12), and the top of the magnet (12) and the bottom of the pressure relief plate (8) are attracted and fit with each other. The top of the cylinder body (1) is provided with a pressure relief start mechanism (6) so that when the piston rod (3) is over-pressured downward, the pressure relief plate (8) can be driven to flip, thereby releasing pressure. The tops of both sides of the cylinder body (1) are provided with limit locking mechanisms (4), and the outer side of the piston rod (3) on one side of the limit locking mechanism (4) is correspondingly provided with a locking groove (11), and the outer side of the piston rod (3) above the locking groove (11) is provided with a flexible locking ring (14), and the limit locking mechanism (4) is used to limit the maximum compression distance of the piston rod (3) to further avoid overpressure of the piston rod (3).

2. The overpressure prevention structure of a nitrogen spring according to claim 1, characterized in that: The pressure relief starting mechanism (6) comprises support plates (601) mounted on both sides of the bottom end inside the cylinder body (1), and the top ends of the two support plates (601) are connected to support rings (602), the top ends of the support rings (602) are mounted with balls (603), and the top ends of both sides of the balls (603) are mounted with pull ropes (604), and one end of the pull ropes (604) is connected to one side of the top end of the pressure relief plate (8).

3. The overpressure prevention structure of a nitrogen spring according to claim 2, characterized in that: The inner diameter of the support ring (602) decreases from top to bottom, the diameter of the ball (603) is greater than the minimum inner diameter of the support ring (602), and the pull rope (604) is located on the top of the pressure relief plate (8) close to the magnet (12).

4. The overpressure prevention structure of a nitrogen spring according to claim 1, characterized in that: One side of the pressure relief plate (8) forms a flip structure with the L-shaped pressure relief channel (7) through a connecting shaft, and a sealing sleeve is arranged on the outside of the pressure relief plate (8) to increase the sealing performance between the pressure relief plate (8) and the L-shaped pressure relief channel (7), and the magnet (12) is located on the side of the bottom end of the pressure relief plate (8) away from the connecting shaft.

5. The overpressure prevention structure of a nitrogen spring according to claim 1, characterized in that: The buffer ring (5) is provided with a piston rod (3), and the buffer rings (5) are distributed at equal intervals on the inner wall of the cylinder body (1). The inner diameter of the buffer ring (5) gradually increases from top to bottom, and the inner diameter of the buffer ring (5) is smaller than the outer diameter of the bottom end of the piston rod (3).

6. The overpressure prevention structure of a nitrogen spring according to claim 1, characterized in that: The limit locking mechanism (4) comprises a flip plate (401) mounted on the top of one side of the cylinder body (1), and a spring (404) is mounted on the top of the flip plate (401) close to the piston rod (3), and one end of the spring (404) is connected to the outer wall of the cylinder body (1), and a pressure plate (402) is mounted on one side of the flip plate (401) above the spring (404), and a roller (403) is mounted on the top of the pressure plate (402) close to the piston rod (3), and one side of the roller (403) is pressed against the outer wall of the piston rod (3).

7. The overpressure prevention structure of a nitrogen spring according to claim 6, characterized in that: The angle between the flip plate (401) and the pressing plate (402) is an obtuse angle, and the spring (404) generates an inward pulling force on the flip plate (401) to ensure that the roller (403) always presses against the outer wall of the piston rod (3).

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