CN217653138U - Air-oil hydraulic expansion device - Google Patents

Abstract

The utility model discloses a pneumatic-hydraulic type telescoping device contains a fluid pressure jar, a piston rod, a valve unit and a pressure relief component, the fluid pressure jar has a cylinder body and a chock of locating the cylinder body, the movably fluid pressure jar of locating of piston rod, the valve unit has a disk seat and a valve rod, the disk seat locate the piston rod and the cylinder body between form one go up fluid chamber and fluid chamber once, the disk seat is located to the valve rod, be used for controlling, the intercommunication between the fluid chamber is held down, pressure relief component locates between disk seat and the chock and is worn to establish by the piston rod, pressure relief component has a intercommunication portion, and a pressure relief clearance has between pressure relief component and the piston rod, the pressure relief clearance is through fluid chamber under the intercommunication portion intercommunication. Therefore, when the valve rod is opened, the communicating part is used for allowing the fluid to flow between the lower fluid chamber and the pressure relief gap, so that the air-tight effect is reduced.

Description

Air-oil hydraulic expansion device

technical field

The utility model relates to a telescopic device, in particular to an air-oil pressure type telescopic device.

Background technique

The pneumatic height adjustment structure disclosed in Taiwan Patent No. TW 619009 enables the control group to push up the ejector shaft to drive the valve stem to move up, so that the first air chamber and the second air chamber communicate with each other. Under the downward pressure, the lift tube descends to adjust the height. If the lift tube is not pressurized, the lift tube rises due to the flow of gas from the second air chamber to the first air chamber, thereby adjusting the height of the seat tube.

However, in the aforementioned patent case, an airtight effect is likely to occur between the piston valve and the shock absorbing member, resulting in an increased resistance between the two. As a result, the rider needs to exert more force to press the seat cushion down. , it is very inconvenient to operate. In addition, the airtight effect will also cancel the shock-absorbing effect produced by the gas, so the shock-absorbing effect cannot be exerted.

Utility model content

The main purpose of the present invention is to provide an air-oil hydraulic expansion device, which can effectively reduce the air-tight effect.

In order to achieve the above-mentioned main purpose, the air-oil hydraulic expansion device of the present invention includes a fluid pressure cylinder, a piston rod, a control valve group, and a pressure relief element. The fluid pressure cylinder has a cylinder body and a plug seat, the plug seat is arranged in the cylinder body and is located at one end of the cylinder body; the piston rod is movably arranged on the fluid pressure cylinder; the control valve group has a valve seat and a valve stem, the valve seat is arranged at one end of the piston rod and forms an upper fluid chamber and a lower fluid chamber between the valve seat and the cylinder, the valve stem is arranged on the valve seat and can be closed When the valve stem is in the closed position, the upper fluid chamber and the lower fluid chamber do not communicate with each other, and when the valve stem is in the open position, the upper fluid chamber and the lower fluid chamber do not communicate with each other. The lower fluid chamber communicates with each other; the pressure relief element is arranged between the valve seat and the plug seat and is penetrated by the piston rod, the pressure relief element has a communication part, and one end of the pressure relief element is connected to the There is a pressure relief gap between the piston rods, and the pressure relief gap communicates with the lower fluid chamber through the communication portion.

It can be seen from the above that when the valve stem is opened, the air-oil hydraulic expansion device of the present invention uses the communication portion to allow fluid to flow between the lower fluid chamber and the pressure relief gap, so as to reduce the airtight effect.

Preferably, the pressure relief element integrally extends from one end of the valve seat toward the plug seat.

Preferably, one end of the pressure relief element has a ring groove, and the groove diameter of the ring groove is larger than the outer diameter of the piston rod, so that the pressure relief gap is formed between the ring groove and the piston rod.

Preferably, one end of the pressure relief element receives one end of the valve seat, and the other end of the pressure relief element abuts against the plug seat.

Preferably, the inner annular surface of the pressure relief element has a concave portion, and the pressure relief gap is formed between the concave portion and the piston rod.

Preferably, the communicating portion may be a plurality of cut grooves arranged in a ring at equal intervals or a plurality of perforations arranged in a ring at an equal interval.

The detailed structure, characteristics, assembly or usage of the air-oil hydraulic telescopic device provided by the present invention will be described in the detailed description of the following embodiments. However, those skilled in the art should understand that these detailed descriptions and specific embodiments for implementing the present invention are only used to illustrate the present invention, and not to limit the protection scope of the present invention.

Description of drawings

FIG. 1 is a perspective view of an air-oil hydraulic expansion device according to Embodiment 1 of the present invention.

FIG. 2 is a partial perspective view of the air-oil hydraulic expansion and contraction device according to the first embodiment of the present invention, where the hydraulic cylinder is omitted.

FIG. 3 is a cross-sectional view of FIG. 1 along line 3-3, mainly showing the valve stem in the closed position.

Figure 4 is similar to Figure 3, mainly showing the valve stem in the open position.

FIG. 5 is a partial perspective view of the pneumatic-oil hydraulic expansion and contraction device according to the second embodiment of the present invention, in which the hydraulic cylinder is omitted.

6 is a cross-sectional view of an air-oil hydraulic expansion and contraction device according to Embodiment 2 of the present invention.

7 is a partial perspective view of the air-oil hydraulic expansion and contraction device according to the third embodiment of the present invention, in which the hydraulic cylinder is omitted.

8 is a perspective view of a pressure relief element provided by the air-oil hydraulic expansion and contraction device according to Embodiment 3 of the present invention.

9 is a cross-sectional view of an air-oil hydraulic expansion and contraction device according to Embodiment 3 of the present invention.

10 is a perspective view of a pressure relief element provided by the air-oil hydraulic expansion and contraction device according to Embodiment 4 of the present invention.

11 is a cross-sectional view of the air-oil hydraulic expansion and contraction device according to Embodiment 4 of the present invention.

Description of reference numbers:

10: Air-oil hydraulic expansion device; 20: Fluid pressure cylinder; 22: Cylinder block; 24: End block; 26: Buffer; 28: Plug seat; 30: Piston rod; 40: Control valve group; 41: Valve seat ;42: Valve hole; 43: Inner radial hole; 44: Outer radial hole; 45: Upper fluid chamber; 46: Lower fluid chamber; 47: Valve stem; 48: Push rod; 49: Compression spring; P1: Closed position; P2: Open position; 50: Pressure relief element; 52: Ring groove; 54: Connecting part; : connecting part; 642: groove; 644: perforation; 66: pressure relief gap.

Detailed ways

The applicant first explains that in the entire specification, including the embodiments described below and the claims, the terms related to the directionality are based on the directions in the drawings. Next, in the embodiments to be introduced below and the accompanying drawings, the same element numbers represent the same or similar elements or their structural features.

As shown in FIGS. 1 to 3 , the air-oil hydraulic expansion device 10 according to the first embodiment of the present invention includes a fluid pressure cylinder 20 , a piston rod 30 , a control valve group 40 , and a pressure relief element 50 .

The hydraulic cylinder 20 has a cylinder block 22 , an end block 24 , a buffer member 26 and a plug seat 28 . The end block 24 is fixed on one end of the cylinder body 22 , the buffer member 26 abuts against one end of the end block 24 , and the plug seat 28 abuts against the other end of the buffer member 26 .

The piston rod 30 is movably penetrated in the fluid pressure cylinder 20 .

The control valve group 40 has a valve seat 41 and a valve stem 47 . The valve seat 41 is arranged in the cylinder body 22 and connected to one end of the piston rod 30, so that the valve seat 41 can act synchronously with the piston rod 30 and form an upper fluid chamber 45 and a lower fluid chamber 46 with the cylinder body 22 . In addition, the valve seat 41 has a valve hole 42 , a plurality of inner radial holes 43 and a plurality of outer radial holes 44 , wherein the valve hole 42 communicates with the upper fluid chamber 45 , and the inner radial holes 43 communicate with the valve hole 42 . The outer radial holes 44 communicate with the inner radial holes 43 and the lower fluid chamber 46 ; the valve rod 47 is arranged in the valve hole 42 of the valve seat 41 and abuts against a push rod arranged in the piston rod 30 with its bottom end 48. When the valve rod 47 is not acted by the thrust force of the push rod 48, the valve rod 47 is kept in the closed position P1 as shown in FIG. In communication, when the valve stem 47 is moved to the open position P2 as shown in FIG. 4 by the thrust of the push rod 48, the upper fluid chamber 45 and the lower fluid chamber 46 pass through the valve hole 42, the inner radial holes 43 and The outer radial holes 44 communicate with each other.

The pressure relief element 50 is disposed between the valve seat 41 and the plug seat 28 and is penetrated by the piston rod 30 . In this embodiment, the pressure relief element 50 integrally extends from the bottom end of the valve seat 41 toward the plug seat 28 out. As shown in FIG. 3 , the bottom end of the pressure relief element 50 has a ring groove 52, and the groove diameter of the ring groove 52 is larger than the outer diameter of the piston rod 30, so that a pressure relief gap 56 is formed between the ring groove 52 and the piston rod 30, In addition, the bottom end of the pressure relief element 50 has a communication portion 54, and the pressure relief gap 56 communicates with the lower fluid chamber 46 through the communication portion 54. In this embodiment, the communication portions 54 are formed by a plurality of annularly arranged at equal intervals. The grooves 542 surrounding the annular groove 52 are formed.

As can be seen from the above, when the valve stem 47 is in the open position P2 as shown in FIG. 4 , the upper fluid chamber 45 and the lower fluid chamber 46 communicate with each other, so that fluid (such as hydraulic oil or high-pressure gas) can be in the upper fluid chamber. 45 and the lower fluid chamber 46, at this time, the communication portion 54 formed by the cut grooves 542 is used to allow the fluid to flow between the lower fluid chamber 46 and the pressure relief gap 56 (as shown by the arrow in FIG. 4 ) , in order to reduce the airtight effect between the pressure relief element 50 and the plug seat 28 when the pressure relief element 50 abuts against the plug seat 28 . shock absorption effect.

It should be supplemented here that the communication portion 54 can have different structural changes. As shown in FIG. 5 and FIG. 6 , in the second embodiment of the present invention, the communication portion 54 is composed of a plurality of annularly arranged at equal intervals. The perforations 544 surrounding the annular groove 52 in such a way as to allow fluid to flow between the lower fluid chamber 46 and the pressure relief gap 56 (as shown by the arrows in FIG. 6 ) through the holes 544 to reduce the resistance of the pressure relief element 50 against The airtight effect between the plug base 28 and the plug base 28 when it is leaned against.

On the other hand, in Embodiment 3 of the present invention, the pressure relief element 60 is not connected with the valve seat 41. As shown in FIG. 7 and FIG. 9 , the top end of the pressure relief element 60 receives the bottom end of the valve seat 41, The bottom end of the pressure relief element 60 abuts against the plug seat 28 . As shown in FIG. 8 and FIG. 9 , the inner ring surface of the pressure relief element 60 has a plurality of concave portions 62 (the number is not limited, as long as at least one) that are arranged annularly at equal intervals. The top surface extends straight to the bottom surface of the pressure relief element 60 , so that a pressure relief gap 66 is respectively formed between the pressure relief element 60 and each concave portion 62 and the piston rod 30 . In addition, the bottom end of the pressure relief element 60 has a communicating portion 64 . In this embodiment, the communicating portion 64 is formed by a plurality of notches 642 arranged in a ring shape at equal intervals. Therefore, when the valve stem 47 is in the open position P2 as shown in FIG. 9 , the upper fluid chamber 45 and the lower fluid chamber 46 communicate with each other, so that fluid (eg hydraulic oil or high-pressure gas) can flow between the upper fluid chamber 45 and the lower fluid chamber 46 The fluid flows between the lower fluid chambers 46. At this time, the communication portion 64 formed by the cut grooves 642 is used to allow the fluid to flow between the lower fluid chamber 46 and the pressure relief gap 66 (as shown by the arrow in FIG. 9), so as to To achieve the purpose of reducing the airtight effect, on the one hand, the rider can conveniently compress the piston rod 30, and on the other hand, the present invention can exert its due shock absorption effect.

It should be supplemented here that the communication portion 64 can have different changes in structure. As shown in FIG. 10 and FIG. 11 , in Embodiment 4 of the present invention, the communication portion 64 is composed of a plurality of annularly arranged at equal intervals. The perforations 644 are formed through which the fluid is allowed to flow between the lower fluid chamber 46 and the pressure relief gap 66 (as shown by the arrows in FIG. 11 ), so as to reduce the airtight effect.

Claims (7)

1. An air-oil pressure type telescopic device is characterized in that: a fluid pressure cylinder, which has a cylinder body and a plug seat, the plug seat is arranged in the cylinder body and is located at one end of the cylinder body; a piston rod, which is movably arranged in the fluid pressure cylinder; A control valve group has a valve seat and a valve stem, the valve seat is arranged at one end of the piston rod and forms an upper fluid chamber and a lower fluid chamber between the cylinder body, the valve stem is arranged on the valve seat and can be Acting between the closed position and the open position, when the valve stem is in the closed position, the upper fluid chamber and the lower fluid chamber do not communicate with each other, and when the valve stem is in the open position, the upper fluid chamber and the lower fluid chamber do not communicate with each other. the lower fluid chambers communicate with each other; and a pressure relief element, which is arranged between the valve seat and the plug seat and is penetrated by the piston rod, the pressure relief element has a communication part, and a pressure relief gap is formed between one end of the pressure relief element and the piston rod, The pressure relief gap communicates with the lower fluid chamber through the communication portion. 2 . The air-oil hydraulic telescopic device according to claim 1 , wherein the pressure relief element integrally extends from one end of the valve seat toward the plug seat. 3 . 3 . The air-oil hydraulic telescopic device according to claim 2 , wherein one end of the pressure relief element has a ring groove, and the groove diameter of the ring groove is larger than the outer diameter of the piston rod, so that the ring groove and the The pressure relief gap is formed between the piston rods. 4 . The air-oil hydraulic telescopic device according to claim 1 , wherein one end of the pressure relief element receives one end of the valve seat, and the other end of the pressure relief element abuts against the plug seat. 5 . 5 . The air-oil hydraulic telescopic device according to claim 4 , wherein the inner annular surface of the pressure relief element has a concave portion, and the pressure relief gap is formed between the concave portion and the piston rod. 6 . 6 . The air-oil hydraulic expansion and contraction device according to claim 1 , wherein the communicating portion is a plurality of cut grooves arranged annularly at equal intervals. 7 . 7 . The air-oil hydraulic expansion and contraction device according to claim 1 , wherein the communication portion is a plurality of perforations arranged annularly at equal intervals. 8 .

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