CN108999909A - A kind of nitrogen device - Google Patents

Abstract

The invention discloses a kind of nitrogen devices, it is provided at the top of cylinder body equipped with the middle set being placed in the middle part of piston rod, piston rod is located at the intracorporal one end of cylinder equipped with piston, thus the inner space of cylinder body is separated into upper chamber and lower chambers, and check valve and flow mold insert are also equipped on piston, it is mobile to upper chamber that check valve can make the nitrogen of bottom chamber, and the venthole for being connected to upper and lower chamber is provided on flow mold insert, and the speed of venthole supplied gas circulation is lower than check valve.Thus, when piston rod is pressed to cylinder base movement, the nitrogen of bottom chamber can be quickly mobile to upper chamber by check valve, it ensure that the speed of nitrogen device compression deformation, and on the other hand, when the compression of piston rod reduces, the indoor nitrogen of epicoele may only be slowly mobile to lower chambers, to make nitrogen device form slow spring deformation, being effectively prevented from leads to equipment or damage of product because rebound velocity is too fast.

Description

A nitrogen device

technical field

The invention relates to a nitrogen gas spring device which uses nitrogen as a working medium and has elasticity.

Background technique

Nitrogen device, or nitrogen spring, nitrogen cylinder, is a new elastic component with high-pressure nitrogen as the working medium. It has small size, large elasticity, long stroke, stable work, precise manufacturing, long service life, gentle elastic curve, It is widely used in the production of mold products due to the advantages of no need for preloading. When the piston rod of the nitrogen gas spring is under pressure, the nitrogen in the cylinder will be compressed, thereby forming an elastic force. After the pressure is eliminated or reduced, the nitrogen in the cylinder will push the piston rod to pop out again quickly. However, for some specific situations, this characteristic is likely to cause adverse effects on production. For example, if the rebound speed of the nitrogen gas spring is too fast, it will easily cause damage to the equipment or the manufactured product.

Contents of the invention

The main purpose of the present invention is to provide a nitrogen device with a slower rebound speed while ensuring the compression deformation speed, so as to avoid damage to the equipment due to excessive rebound speed.

In order to achieve the above object, the present invention proposes a nitrogen device, which includes a cylinder with a chamber inside and an opening at the top. A middle sleeve with an axial through hole is installed at the opening of the cylinder, and one end of the piston rod passes through the middle sleeve. The through hole extends into the cylinder and is equipped with a piston, and the outer wall of the piston and the inner wall of the cylinder, the inner wall of the middle sleeve and the piston rod, and the outer wall of the middle sleeve and the cylinder are respectively sealed and connected by seals. The part between the middle sleeve and the piston forms the upper chamber, and the part of the cylinder between the piston and the bottom of the cylinder forms the lower chamber. The piston is equipped with a one-way valve for the gas to flow from the lower chamber to the upper chamber. , The piston is also equipped with a flow insert, and the flow insert is provided with a vent hole communicating with the upper chamber and the lower chamber, and the speed of the vent hole for gas circulation is lower than that of the one-way valve.

In the technical solution of the present invention, the piston and the end of the piston rod are connected as a whole, and the piston is movably arranged in the cylinder body. Divided into two parts, the first part is the upper chamber between the piston and the middle sleeve, and the second part is the lower chamber between the piston and the bottom of the cylinder body. At the same time, because the piston is movable, the space between the two chambers can be adjusted. In addition, the piston is provided with a one-way valve and a flow insert with a vent hole, so that the gas in the lower chamber can flow into the upper chamber through the one-way valve and the vent hole of the flow insert at the same time, and the upper chamber The gas can only flow into the lower chamber through the flow insert. During the working process, when the end of the piston rod located outside the cylinder is under pressure, the piston rod drives the piston to move to the bottom of the cylinder, nitrogen in the lower chamber flows into the upper chamber from the one-way valve quickly, and nitrogen in the upper chamber The air pressure is increased to balance with the air pressure in the lower chamber; when the pressure on the piston rod is eliminated or reduced, because the gas flow rate from the upper chamber to the lower chamber through the vent hole is slower, the piston and the piston rod will move faster Slow speeds create rebound. Therefore, the deformation speed of the nitrogen device is relatively fast when it is pressurized and can be maintained at a normal level, and it will rebound at a slow speed after the pressure is relieved and reduced, thereby effectively avoiding the damage caused by excessive rebound speed. Equipment damage.

Description of drawings

Fig. 1 is the structural representation of nitrogen device;

Fig. 2, 3 are partial structural representations of nitrogen device shown in Fig. 1;

FIG. 4 is an enlarged detail view of part A of FIG. 3 .

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that if the embodiment of the present invention involves directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, vertical, counterclockwise, clockwise, circumferential direction, radial direction, axial direction...), the directional indication is only used to explain the relative positional relationship, movement conditions, etc. When a change occurs, the directional indication changes accordingly.

In addition, if there is a description related to "first" or "second" in the embodiment of the present invention, the description of "first" or "second" is only for the purpose of description, and should not be understood as indicating or implying Its relative importance or implicitly indicates the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , nor within the scope of protection required by the present invention.

The invention provides a nitrogen device.

In the embodiment of the present invention, as shown in Figures 1-3, the nitrogen device includes a cylinder 1 with a chamber inside and an open top, a middle sleeve 2 with an axial through hole is installed at the opening of the cylinder, and a piston rod 3 One end of one end passes through the through hole of the middle sleeve and stretches into the cylinder body and is equipped with a piston 4, and between the outer wall of the piston and the inner wall of the cylinder, between the inner wall of the middle sleeve and the piston rod, and between the outer wall of the middle sleeve and the cylinder body. Through the sealing connection of the seal, the part of the cylinder between the middle sleeve and the piston forms the upper chamber 5, and the part of the cylinder between the piston and the bottom of the cylinder forms the lower chamber 6, and the piston is equipped with a supply gas from the bottom. The chamber flows to the one-way valve 7 of the upper chamber, the piston is also equipped with a flow insert 8, and the flow insert is opened with a vent hole 9 connecting the upper chamber and the lower chamber, and the speed of the vent hole for gas circulation is low on the one-way valve.

As shown in Figure 1, the chamber of the cylinder body is divided into an upper chamber and a lower chamber, and the spaces of these two chambers are transformed into each other by the movement of the piston. During the working process, when the end of the piston rod located outside the cylinder is under pressure, the piston rod drives the piston to move to the bottom of the cylinder, nitrogen in the lower chamber flows into the upper chamber from the one-way valve quickly, and nitrogen in the upper chamber The air pressure is increased to balance with the air pressure in the lower chamber; when the pressure on the piston rod is eliminated or reduced, because the gas flow rate from the upper chamber to the lower chamber through the vent hole is slower, the piston and the piston rod will move faster Slow speeds create rebound. Therefore, the nitrogen device deforms quickly and maintains a normal level when it is under pressure, and rebounds at a slow speed after the pressure is removed and reduced. It should be noted that the size of the vent hole can be set according to needs, the smaller the setting, the slower the rebound speed of the piston rod after the pressure is eliminated and reduced, and vice versa.

In the nitrogen device, the bottom of the cylinder body 1 is equipped with an openable valve 10, and the valve valve is connected to the chamber of the cylinder body. Nitrogen is added to the cylinder.

The inner wall of the cylinder body 1 and the outer wall of the middle sleeve 2 are oppositely provided with an inwardly recessed groove 11, and the circlip 12 that fixes the cylinder body and the middle sleeve to each other is installed in the groove; the groove at the inner wall of the cylinder body 1 11 is inclined to transition into the cylinder body. The seal between the cylinder body and the outer wall 2 of the middle sleeve is an O-ring 13, and the O-ring is arranged on the outer wall of the middle sleeve and is located between the retaining spring 11 and the middle sleeve in the cylinder body. Between one end of the inner wall of the cylinder, there is an inwardly recessed exhaust groove 14 between the O-ring and the end of the middle sleeve. The cylinder body and the middle sleeve are relatively fixed by the circlip, which has a simple structure and stable operation; in addition, the groove on the cylinder body is inclined to transition to the cylinder body, so that the circlip can move along the transition surface, that is, the middle sleeve can move toward the cylinder. Movement in the body, which allows the O-ring to move to the exhaust groove by pressing down on the middle sleeve when the vent hole of the flow insert is blocked, so that the nitrogen in the upper chamber passes through the exhaust groove and the cylinder The gap between it and the middle sleeve is removed, so that maintenance and repair of the nitrogen device can be carried out more easily.

An outer dustproof jacket 15 is installed between the inner wall of the top opening of the cylinder body 1 and the outer wall of the middle sleeve 2, and an inner dustproof jacket 16 is installed between the inner wall of the middle jacket and the piston rod 3. External dust enters the interior of the nitrogen device and affects the operation of the device. Wear-resistant sleeves 17 are installed between the inner wall of the middle sleeve 2 and the piston rod 3, and between the piston 4 and the inner wall of the cylinder body 1. Through the wear-resistant sleeves, the relative movement between parts can be smoother, and can also be more effectively protected. parts and improve the service life of parts. The inner wall of one end of the middle sleeve 2 located in the cylinder body 1 is provided with an inwardly recessed concave platform, and a retaining ring 18 is installed in the concave platform, and the stability of the relative movement between the piston rod and the middle sleeve is improved by the retaining ring. In addition, The seal between the inner wall of the middle sleeve 2 and the piston rod 3 is arranged in the recess, and the seal is arranged in the recess near the end of the middle sleeve. In addition, the piston 4 is fixedly installed on the piston rod 3 through the fixing screw 19, the installation structure is simple and the operation is stable.

The above is only a preferred embodiment of the present invention, and does not therefore limit the patent scope of the present invention. Under the inventive concept of the present invention, the equivalent structural transformation made by using the description of the present invention and the contents of the accompanying drawings, or direct/indirect use All other relevant technical fields are included in the patent protection scope of the present invention.

Claims (10)

1. a kind of nitrogen device, including it is internal with chamber and open-topped cylinder body (1), the opening installation of cylinder body is with axis To the middle set (2) of through-hole, one end of piston rod (3) passes through the through-hole of middle set and protrudes into cylinder body and piston (4) are housed, and piston Outer wall and inboard wall of cylinder block between, between middle set inner wall and piston rod, it is close by sealing element respectively between middle set outer wall and cylinder body Envelope connection, the part in cylinder body positioned at middle set and piston between form upper chamber (5), be located in cylinder body piston and cylinder base it Between part form lower chambers (6), it is characterised in that: the check valve of upper chamber is flowed to from lower chambers equipped with supplied gas on piston (7), it is also equipped on piston flow mold insert (8), the venthole (9) of connection upper chamber and lower chambers is provided on flow mold insert, and logical The speed of stomata supplied gas circulation is lower than check valve.

2. nitrogen device as described in claim 1, it is characterised in that: opposite on the inner wall of cylinder body (1) and the outer wall of middle set (2) Ground is provided with the groove (11) being recessed inwardly, and the circlip (12) that cylinder body and middle set are fixed to each other is installed in groove.

3. nitrogen device as claimed in claim 2, it is characterised in that: groove (11) at cylinder body (1) inner wall is to cylinder body introversion Oblique transition, the sealing element between cylinder body and middle set outer wall (2) is set on middle set outer wall and is located at circlip (11) to be located at middle set Between one end of cylinder body, inboard wall of cylinder block is relative to being provided with the air discharge duct being recessed inwardly between the sealing element and middle set end (14).

4. nitrogen device as claimed in claim 3, it is characterised in that: the sealing element between cylinder body and middle set outer wall (2) is O-shaped Sealing ring (13).

5. nitrogen device as described in claim 1, it is characterised in that: the bottom of cylinder body (1), which is equipped with, can be opened and closed air valve (10), Air valve is connected to the chamber of cylinder body.

6. nitrogen device as described in claim 1, it is characterised in that: the inner wall of cylinder body (1) top open part and middle set (2) Outer dirt-proof boot (15) are housed between outer wall, interior dirt-proof boot (16) are housed between the inner wall and piston rod (3) of middle set.

7. nitrogen device as described in claim 1, it is characterised in that: between the inner wall and piston rod (3) of middle set (2), piston (4) it is respectively arranged between 1 inner wall of cylinder body () wear-resistant sleeve (17).

8. nitrogen device as described in claim 1, it is characterised in that: middle set (2) is located at the inner wall of one end in cylinder body (1) Equipped with the concave station being recessed inwardly, concave station is provided with retaining ring (18).

9. nitrogen device as claimed in claim 8, it is characterised in that: the sealing element between middle set (2) inner wall and piston rod (3) It is set in concave station, and the sealing element is set to one end in concave station close to middle set end.

10. nitrogen device as described in claim 1, it is characterised in that: piston (4) is fixedly installed in by fixing screws (19) On piston rod (3).