CN217653138U

CN217653138U - Gas-oil pressure type expansion device

Info

Publication number: CN217653138U
Application number: CN202221606850.2U
Authority: CN
Inventors: 冯彬杰; 郭念腾; 刘椿桂
Original assignee: JD Components Co Ltd
Current assignee: JD Components Co Ltd
Priority date: 2022-06-23
Filing date: 2022-06-23
Publication date: 2022-10-25
Anticipated expiration: 2032-06-23

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

Gas-oil pressure type telescopic device

Technical Field

The utility model relates to a telescoping device, in particular to gas-oil pressure formula telescoping device.

Background

The pneumatic height adjusting structure disclosed in taiwan patent No. TW 619009 drives the valve rod to move upward by starting the control group to push the top shaft upward, so that the first air chamber and the second air chamber communicate with each other, the lift pipe descends to adjust the height under the downward pressure of the seat cushion, and if the lift pipe is not pressed, the lift pipe is lifted by the gas flowing from the second air chamber to the first air chamber, thereby adjusting the height of the seat pipe.

However, in the above patent, the air-tight effect is easily generated between the piston valve and the shock absorbing member, and the resistance between the piston valve and the shock absorbing member becomes large, so that the rider needs to exert a greater force to press down the seat cushion, which is very inconvenient in operation. In addition, the airtight effect also counteracts the shock-absorbing effect generated by the gas, so that the proper shock-absorbing effect cannot be exerted.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide a pneumatic/hydraulic telescopic device, which can effectively reduce the airtight effect.

In order to achieve the above objective, the present invention provides a pneumatic/hydraulic expansion device, which comprises a hydraulic cylinder, a piston rod, a control valve set, and a pressure relief element. The fluid pressure cylinder is provided with a cylinder body and a plug seat, and the plug seat is arranged in the cylinder body and is positioned at one end of the cylinder body; the piston rod is movably arranged on the fluid pressure cylinder; the control valve group is provided with a valve seat and a valve rod, the valve seat is arranged at one end of the piston rod and forms an upper fluid chamber and a lower fluid chamber with the cylinder body, the valve rod is arranged on the valve seat and can move between a closing position and an opening position, when the valve rod is positioned at the closing position, the upper fluid chamber and the lower fluid chamber are not communicated with each other, and when the valve rod is positioned at the opening position, the upper fluid chamber and the lower fluid chamber are communicated 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 is provided with a communicating part, a pressure relief gap is arranged between one end of the pressure relief element and the piston rod, and the pressure relief gap is communicated with the lower fluid chamber through the communicating part.

Therefore, when the valve rod is opened, the pneumatic-hydraulic type expansion device of the present invention utilizes the communicating portion to allow the fluid to flow between the fluid chamber and the pressure relief gap under the communicating portion, so as to reduce the effect of the airtight effect.

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

Preferably, one end of the pressure relief element is provided with a ring groove, and the 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 communication portion may be a plurality of slits arranged in a ring shape at equal intervals or a plurality of perforations arranged in a ring shape at equal intervals.

The detailed structure, characteristics, assembly or use of the pneumatic/hydraulic telescopic device according to the present invention will be described in the following detailed description of the embodiments. However, it should be understood by those skilled in the art that the detailed description and specific examples, while indicating the specific embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

Drawings

Fig. 1 is a perspective view of a gas-oil pressure type telescopic device according to embodiment 1 of the present invention.

Fig. 2 is a partial perspective view of a pneumatic/hydraulic expansion device according to embodiment 1 of the present invention, with a fluid pressure cylinder omitted.

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

Fig. 4 is a view similar to fig. 3, and primarily shows the valve stem in an open position.

Fig. 5 is a partial perspective view of the pneumatic/hydraulic type telescopic device according to embodiment 2 of the present invention, with the fluid pressure cylinder omitted.

Fig. 6 is a cross-sectional view of a pneumatic/hydraulic type expansion device according to embodiment 2 of the present invention.

Fig. 7 is a partial perspective view of a pneumatic/hydraulic type expansion device according to embodiment 3 of the present invention, with a fluid pressure cylinder omitted.

Fig. 8 is a perspective view of a pressure relief element provided in the pneumatic/hydraulic type expansion device according to embodiment 3 of the present invention.

Fig. 9 is a sectional view of a pneumatic/hydraulic type expansion device according to embodiment 3 of the present invention.

Fig. 10 is a perspective view of a pressure relief element provided in the pneumatic/hydraulic type expansion device according to embodiment 4 of the present invention.

Fig. 11 is a sectional view of a pneumatic/hydraulic type expansion device according to embodiment 4 of the present invention.

Description of reference numerals:

10: a gas-oil pressure type telescopic device; 20: a fluid pressure cylinder; 22: a cylinder body; 24: an end block; 26: a buffer member; 28: a plug seat; 30: a piston rod; 40: a control valve group; 41: a valve seat; 42: a valve bore; 43: an inner radial bore; 44: an outer radial bore; 45: an upper fluid chamber; 46: a lower fluid chamber; 47: a valve stem; 48: a push rod; 49: a compression spring; p1: a closed position; p2: an open position; 50: a pressure relief element; 52: a ring groove; 54: a communicating portion; 542: grooving; 544: perforating; 56: a pressure relief gap; 60: a pressure relief element; 62: a recess; 64: a communicating part; 642: grooving; 644: perforating; 66: and (6) relieving the pressure of the gap.

Detailed Description

Applicants first describe herein, throughout this specification, including the examples and claims that follow, directional terminology will be used with reference to the orientation of the figures. Next, in the embodiments and the drawings to be described below, the same element numbers denote the same or similar elements or structural features thereof.

As shown in fig. 1 to 3, a pneumatic/hydraulic expansion device 10 according to embodiment 1 of the present invention includes a hydraulic cylinder 20, a piston rod 30, a control valve set 40, and a pressure relief element 50.

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

The piston rod 30 is movably inserted into the fluid pressure cylinder 20.

The control valve assembly 40 has a valve seat 41 and a valve stem 47. The valve seat 41 is disposed in the cylinder 22 and connected to one end of the piston rod 30, such that the valve seat 41 can move synchronously with the piston rod 30 and forms an upper fluid chamber 45 and a lower fluid chamber 46 with the cylinder 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, the inner radial holes 43 communicate with the valve hole 42, and the outer radial holes 44 communicate with the inner radial holes 43 and the lower fluid chamber 46; the valve rod 47 is disposed in the valve hole 42 of the valve seat 41 and abuts against a push rod 48 disposed in the piston rod 30 with its bottom end, and when the valve rod 47 is not urged by the push rod 48, the valve rod 47 is held in a closed position P1 as shown in fig. 3 by a compression spring 49 such that the upper fluid chamber 45 and the lower fluid chamber 46 are not communicated with each other, and when the valve rod 47 is moved to an open position P2 as shown in fig. 4 by the urging force of the push rod 48, the upper fluid chamber 45 and the lower fluid chamber 46 are communicated with each other through the valve hole 42, the inner radial holes 43, and the outer radial holes 44.

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, and in the present embodiment, the pressure relief element 50 integrally extends from the bottom end of the valve seat 41 toward the plug seat 28. As shown in fig. 3, the bottom end of the pressure relief element 50 has a ring groove 52, the diameter of the ring groove 52 is larger than the outer diameter of the piston rod 30, such that a pressure relief gap 56 is formed between the ring groove 52 and the piston rod 30, and the bottom end of the pressure relief element 50 has a communicating portion 54, the pressure relief gap 56 communicates with the lower fluid chamber 46 through the communicating portion 54, in this embodiment, the communicating portion 54 is formed by a plurality of cutting grooves 542 annularly arranged at equal intervals around the ring groove 52.

As can be seen from the above description, when the valve rod 47 is located at the open position P2 shown in fig. 4, the upper fluid chamber 45 and the lower fluid chamber 46 are communicated with each other, so that a fluid (for example, hydraulic oil or high-pressure gas) can flow between the upper fluid chamber 45 and the lower fluid chamber 46, and at this time, the communicating portion 54 formed by the cutting grooves 542 allows the fluid to flow between the lower fluid chamber 46 and the pressure relief gap 56 (as shown by the arrow in fig. 4), so as to reduce the airtight effect between the pressure relief element 50 and the plug seat 28 when the pressure relief element abuts against the plug seat 28, on one hand, the rider can conveniently compress the piston rod 30, and on the other hand, the present invention can exert the desired shock absorbing effect.

It should be noted that the communication portion 54 can be varied in structure, as shown in fig. 5 and 6, in embodiment 2 of the present invention, the communication portion 54 is formed by a plurality of through holes 544 annularly arranged at equal intervals around the annular groove 52, and the through holes 544 allow fluid to flow between the lower fluid chamber 46 and the pressure relief gap 56 (as shown by arrows in fig. 6), so as to reduce the air-tight effect between the pressure relief element 50 and the plug seat 28 when the pressure relief element abuts against the plug seat 28.

On the other hand, in embodiment 3 of the present invention, the pressure relief element 60 is not connected to the valve seat 41, and as shown in fig. 7 and 9, the top end of the pressure relief element 60 receives the bottom end of the valve seat 41, and the bottom end of the pressure relief element 60 abuts against the plug seat 28. As shown in fig. 8 and 9, the inner ring of the pressure relief element 60 has a plurality of recesses 62 (the number is not limited, and at least one recess is required), which are arranged in a ring shape at equal intervals, and the recesses 62 extend straight from the top surface of the pressure relief element 60 to the bottom surface of the pressure relief element 60, so that a pressure relief gap 66 is formed between each recess 62 of the pressure relief element 60 and the piston rod 30. Further, the bottom end of the pressure relief element 60 has a communicating portion 64, and in the present embodiment, the communicating portion 64 is formed by a plurality of slits 642 annularly arranged at equal intervals. Therefore, when the valve rod 47 is located at the open position P2 shown in fig. 9, the upper fluid chamber 45 and the lower fluid chamber 46 are communicated with each other, so that a fluid (e.g., hydraulic oil or high-pressure gas) can flow between the upper fluid chamber 45 and the lower fluid chamber 46, and at this time, the communicating portion 64 formed by the cutting 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 achieve the purpose of reducing the airtight effect, on one hand, allowing a rider to conveniently compress the piston rod 30, and on the other hand, allowing the present invention to exert a desired shock absorbing effect.

It should be noted that the communication portion 64 can be varied in structure, as shown in fig. 10 and 11, in embodiment 4 of the present invention, the communication portion 64 is formed by a plurality of through holes 644 arranged in an annular shape with equal intervals, and the through holes 644 allow the fluid to flow between the lower fluid chamber 46 and the pressure relief gap 66 (as shown by arrows in fig. 11), so as to achieve the purpose of reducing the air-tight effect.

Claims

1. The utility model provides a gas-oil pressure formula telescoping device which characterized in that:

the hydraulic cylinder is provided with a cylinder body and a plug seat, and the plug seat is arranged in the cylinder body and is positioned at one end of the cylinder body;

a piston rod movably arranged on the fluid pressure cylinder;

the control valve group is provided with a valve seat and a valve rod, the valve seat is arranged at one end of the piston rod, an upper fluid chamber and a lower fluid chamber are formed between the valve seat and the cylinder body, the valve rod is arranged on the valve seat and can move between a closed position and an open position, when the valve rod is positioned at the closed position, the upper fluid chamber and the lower fluid chamber are not communicated with each other, and when the valve rod is positioned at the open position, the upper fluid chamber and the lower fluid chamber are communicated with each other; and

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 is provided with a communicating part, a pressure relief gap is arranged between one end of the pressure relief element and the piston rod, and the pressure relief gap is communicated with the lower fluid chamber through the communicating part.

2. The pneumatic-hydraulic telescopic device according to claim 1, wherein the pressure relief member integrally extends from one end of the valve seat toward the plug seat.

3. The pneumatic-hydraulic telescopic device as claimed in claim 2, wherein the pressure relief element has a ring groove at one end thereof, and the diameter of the ring groove is greater than the outer diameter of the piston rod, so that the pressure relief gap is formed between the ring groove and the piston rod.

4. The pneumatic-hydraulic telescopic device as claimed in claim 1, wherein one end of the pressure-releasing element is received by one end of the valve seat, and the other end of the pressure-releasing element abuts against the plug seat.

5. The pneumatic-hydraulic telescopic device according to claim 4, wherein the inner annular surface of the pressure relief element has a concave portion, and the concave portion and the piston rod form the pressure relief gap therebetween.

6. The gas-hydraulic telescopic device according to any one of claims 1 to 5, wherein the communicating portion is a plurality of slits annularly arranged at equal intervals.

7. The gas-oil pressure type telescopic device according to any one of claims 1 to 5, wherein the communicating portion is a plurality of perforations arranged in a ring shape at equal intervals.