KR20140094326A

KR20140094326A - Low friction piston packing for an pressure booster

Info

Publication number: KR20140094326A
Application number: KR1020130007026A
Authority: KR
Inventors: 김학성; 박고이; 차민선
Original assignee: (주) 티피씨 메카트로닉스
Priority date: 2013-01-22
Filing date: 2013-01-22
Publication date: 2014-07-30

Abstract

A low friction piston packing for a pressure booster is disclosed. The pressure booster low friction piston packing disclosed in one embodiment of the present invention includes a switching valve portion having an air operated five port structure for supplying compressed air to one piston and driving the piston to exhaust the pressure of the other piston to the outside air, A sensing valve for switching the valve body by double sensing that the pilot air is supplied to the switching valve portion when the piston reaches the stroke end during reciprocation of the piston, And an air supply check valve mounted on a central portion of the piston. The piston packing of the piston is made of a different material by adhering and coating Teflon, which is a fluororesin, on the sealing surface of the rubber material.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a low friction piston packing for a pressure booster,

The present invention relates to a low friction piston packing for a pressure booster.

As is well known, a pressure booster generates a reciprocating action of a piston disposed inside a cylinder tube to increase the pressure of the pressure fluid supplied to the pressure increasing chamber, that is, the pressure increasing chamber, This is an air pressure device that is used throughout the automation industry, such as industrial equipment, inspection equipment, booster pressure lines, etc., for increasing the air pressure of piping.

As the piston is freely displaced under the action of the pressure fluid supplied to the drive chamber of the cylinder tube, the pressure fluid in the pressure chamber existing on the opposite side from the drive chamber with respect to the piston increases in pressure, And is discharged from the discharge port.

Conventional pressure booster is difficult to assemble and disassemble, and it is also difficult to inspect and replace the sensing valve when the sensing valve is abnormal. Moreover, since the internal pressure of the air storage tank A longer time is required to be filled with the set pressure.

And the packing mounted on the outer circumferential surface of the piston which slides along the inner circumferential surface of the cylinder tube and reciprocates and displaces is made of a rubber material. As a result, there is a problem in durability for sealing due to the characteristics of a rubber material, and wear of the packing is excessively increased due to the sliding frictional force at the time of reciprocation of the piston, and improvement of the packing durability is required.

(Patent Document 1) Korean Patent No. 10-0963280 (2010.11.11)

(Patent Document 2) Korean Patent Laid-Open No. 10-2001-0033338 (published on April 25, 2001)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances, and it is an object of the present invention to reduce the number of assembly parts, to easily secure and utilize the internal space, to facilitate assembly and disassembly, The flow path loss can be reduced due to the simple structure of the flow path and the time for filling the air storage tank with the set pressure can be shortened and the life of the product can be increased by significantly reducing the amount of packing wear. To provide a friction piston packing.

To attain the above object, according to one aspect of the present invention, there is provided a low-friction piston packing for a pressure booster, comprising: an air operated 5-port structure for supplying compressed air to a piston at one side and driving the piston; A sensing valve for switching the valve body by double sensing in which the pilot air is supplied to the switching valve portion when the piston reaches the stroke end during the reciprocating motion of the piston, And a check valve for the main air supply is installed at the center of the check valve so that a flow path is formed. The piston packing of the piston is made of a different material by adhering and coating Teflon, which is a fluororesin, .

The sensing valve may be mounted outside the valve body.

According to the embodiment of the present invention, by applying the air operation type having the five-port structure to the switching valve unit, it is possible to perform the switching operation of the valve by compressed air without using a separate power source. Further, It is possible to secure the response performance and the service life of the switching valve.

Further, according to the embodiment of the present invention, when the piston reaches the end of the stroke during the reciprocating motion of the piston, the pilot air is supplied to the switching valve portion naturally, The inner space can be easily secured and utilized, and a simple flow path structure can be achieved, thereby reducing the flow loss.

Further, according to the embodiment of the present invention, since the sensing valve having the function of discharging the pilot air supplied to the switching valve unit to the outside and switching the direction of the switching valve body is externally mounted, it is easy to disassemble and assemble, , And can be easily checked and replaced.

According to the embodiment of the present invention, since the main air supply check valve is installed at the central portion of the booster valve, the flow path from the infot to the out port of the air storage tank is formed, So that the filling time can be shortened.

Lastly, since the packing used for the sealing surface of the packing is made of a different material by adhering and coating Teflon made of fluororesin, the amount of wear of the packing due to frictional force or the like generated during movement of the packing can be remarkably reduced, , An improvement in operability at low pressure, and an effect that can be used for a long time without changing characteristics and performance in a non-lube environment.

1 is a perspective view showing a pressure booster employing a piston packing according to an embodiment of the present invention,
Fig. 2 is a circuit diagram of the pressure booster of Fig. 1,
FIG. 3 is a partially cutaway perspective view showing the piston assy of the pressure booster of FIG. 1,
Fig. 4 is a cross-sectional view showing the detailed structure of the piston inspection of Fig. 3,
Figure 5 is a block diagram of the piston packing of the piston assembly of Figure 4;

Hereinafter, the operation principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

FIG. 1 shows a pressure booster according to an embodiment of the present invention, and FIG. 2 shows a circuit configuration of the pressure booster of FIG.

1 and 2, the pressure booster 100 is generally provided with pistons 14 and 16 inside a pair of cylinder tubes 10 and 12, and a center between the cylinder tubes 10 and 12 Unit 20 shown in Fig. When the piston rod 18 connecting the pistons 14 and 16 to each other is eccentric (or offset) with respect to the pistons 14 and 16 and the cylinder tubes 10 and 12, an offset And may further include an absorption part (not shown).

End blocks 22 and 24 are fitted in the cylinder tubes 10 and 12 so as to close their ends and the pistons 14 and 16 are connected to each other by a piston rod 18, The booster chambers A and B are formed in the booster chambers A and B, respectively, and the pistons 14 and 16 are freely displaced in the booster chambers A and B.

Drive chambers A and B are formed between each of the pistons 12 and 14 and the end blocks 22 and 24, respectively.

The central unit 20 is provided with a body serving as a booster valve and having a supply port 42 and a discharge port 44 through which a pressure fluid is supplied and discharged and a supply port 42 which is connected to the supply port 42 and the booster chambers A and B And a second check valve 52 for switching the communication state between the discharge port 44 and the booster chambers A and B. The first check valve 50 switches the communication state between the booster chambers A and B,

A switching valve portion 60 of a double switching valve for switching supply and discharge of the pressure fluid in the booster chambers A and B under the displacement action of the pistons 12, And can be attached to the outside.

The supply port 42 is connected to a source of pressurized fluid (not shown) to supply a pressurized fluid and has a regulating valve 46 that can regulate the flow rate of the pressurized fluid. The control valve 46 may be arranged to regulate the flow rate of the pressure fluid as the operator rotates the handle 30 disposed on the body of the central unit 20.

On the other hand, the switching valves 22 and 24 may be provided with switching direct-acting two-port valves 62 and 64, respectively. The center unit 20 may be provided with a double sensing unit 70 capable of detecting the switching of the switching valve unit 60 and may be provided with two orifices 72 for delaying air supply and exhaustion. have.

The check valve 80 for the main air supply may be additionally provided in the path between the supply port 42 and the discharge port 44 before starting compression.

Figs. 3 and 4 respectively show the detailed configurations of the piston assy of Fig. 1 pressure booster and the piston assy of Fig. 3, and Fig. 5 shows the configuration of the piston packing of the piston assy of Fig.

3 to 5, the low-friction piston packing 32 for a pressure booster according to an embodiment of the present invention can be used for a pressure-reducing valve, a pneumatic actuator, or the like, for sealing a fluid, The sealing surface is characterized by being made of different materials by adhering and coating Teflon, which is a fluororesin, on the parts.

Packings made of rubber material have been widely used in the case of general-purpose piston packing used in conventional pressure-regulating valves and pneumatic cylinders. However, due to the characteristics of the rubber material, the adhesion for sealing is good, but the disadvantage is that the life of the packing is short due to rapid wear due to frictional force generated during exercise. This causes internal leakage of the product, which reduces product performance and efficiency and shortens product life.

On the other hand, in the low friction piston packing of the present invention, the Teflon coating instead of the rubber material is used to seal the surface to be sealed through the close contact with the counterpart, thereby significantly reducing the amount of wear of the packing due to frictional force, .

As a result, fluororesin type Teflon is a material with high heat resistance and low coefficient of friction. It has almost no wear compared to conventional rubber piston packing, so it can prevent leakage even after long use, And it can be used for a long time without changing characteristics and performance in a non-lube environment.

The pressure booster according to an embodiment of the present invention configured as described above is provided with a five-port structure for supplying the supply pressure to the piston in one direction to drive the piston in the case of the switching valve unit and discharging the pressure of the opposite piston to the outside. The air operation type (Air Operate type) was adopted to enable valve switching operation by compressed air without any power source.

In order to ensure the response performance and long service life of the switching valve, the valve body switching method was selected as the double type.

The pilot air supply structure for switching the direction of the switching valve body was designed by a double sensing method. This is because, unlike the case where the supply of the pilot air to the switching valve portion is performed by mechanical driving, when the piston reaches the stroke end during the piston reciprocating motion, And is supplied to the switching valve unit.

Such a structure can reduce the number of parts more innovatively than the method of supplying pilot air by mechanical driving, and it is possible to reduce the number of parts assembled at the center of the product, The flow loss can be reduced.

A direct-acting two-port valve (hereinafter referred to as a sensing valve), which functions to discharge the pilot air supplied to the switching valve unit to the outside to switch the direction of the switching valve body, It can be designed to be easy to disassemble and assemble so that customers can easily inspect and replace the sensing valve when an abnormality is found.

A check valve for MAIN AIR supply is installed at the center of the booster valve to form a flow path from the IN PORT to the OUT PORT air storage tank without going through the other parts. Respectively.

This is because, while the supply pressure of the inlet becomes equal to the air pressure of the out port, the infot supply pressure is supplied directly to the out port or the air storage tank without going through the flow path of the switching valve, The time required to completely fill the storage tank can be shortened.

The operation principle of the pressure booster circuit according to one embodiment of the present invention constructed as described above will be described below.

First, a part of the inlet-side air of the inlet is supplied to the first and second chambers (Chambers A and B) through a check valve, and the rest is supplied to the second drive chamber ).

Then, the air pressure of the first chamber (Chamber A) and the second driving chamber (Driver Room B) act on the hydraulic pressure area of the piston to increase the air pressure of the second chamber (Chamber B) Out port or air storage tank.

Then, when the piston reaches the end of the stroke (stroke), the piston presses the switch of the sensing valve. At the same time, the switching valve body is switched so that the existing second driving room (Driver Room B) The driver room A is switched to the supply state.

Then, the direction of the piston motion reverses, and this time the air pressure of the first chamber (Chamber A) is increased and sent to the outport or air storage tank.

Such a piston repetition motion continuously supplies a higher pressure to the out port than the infot.

As described above, the present invention is not limited to the above-described embodiment, but may be applied to a pressure booster circuit according to an embodiment of the present invention. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

10, 12: cylinder tube 14, 16: piston
18: Piston rod 20: Central unit
22, 24: end block 30: handle
42: supply port 44: exhaust port
46: regulating valve 50: first check valve
52: second check valve 60:
62, 64: 2 port valve 70: double sensing part
72: Orifice 80: Check valve for main air supply

Claims

A switching valve portion having an air operated five port structure for supplying compressed air to one piston and driving the same, and exhausting the pressure of the other piston to the outside air,
A sensing valve for switching the valve body by double sensing that pilot air is supplied to the switching valve portion when the piston reaches the stroke end during reciprocating movement of the piston,
And a check valve for the main air supply is installed at the center so as to form a flow path from the inlet to the out port,
The piston packing of the piston is made of a different material by adhering and coating Teflon, which is a fluororesin, on the sealing surface of the rubber material.
Low friction piston packing for pressure booster.

The method according to claim 1,
The sensing valve is mounted on the outside of the valve body
Low friction piston packing for pressure booster.