KR19980065294A - Airless Paint Spray Pump - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airless paint spray pump. In particular, in an airless paint spray pump, a punching plate 63 incorporating a filter 64 includes a main body case 44 by means of covers 61 and 65. Exhaust silencer 13 is installed to be in the upper portion of the; The distributor 67 is built in the upper part of the main body case 44 so as to be inwardly communicated with the lower part of the cover 65 and the valve spool (2-) in the valve housing 70 attached to the lower part of the distributor 67. 1) the compressed air direction switching valve (2) is built so as to move left and right; The cylinder 24, which is internally communicated with the compressed air direction switching valve 2 by the front and rear inlet pipes 52 and 50, is built in the lower part of the body case 44, and the piston 6 and the piston 24 are connected to the cylinder 24. A booster cylinder part 40 having a piston rod 20 mounted up and down and having a base plate 77 attached to a lower portion of the cylinder 24; Air is built into the base port plate 74 installed between the valve housing 70 and the cylinder 24 to allow air to be contacted by the rods 3-2 and 4-2 contacting the piston 6 of the cylinder 24. Forward and backward forwarding pilot valves 3 and 4 for delivering the pressure air of the pressure source 100 to the compressed air direction switching valve 2 through pilot pipes 55 and 56; As the upper end is inserted into the center of the base plate 77, the lower end of the piston rod 20 is built so as to move up and down, the packing housing 79 and the sleeve to the paint discharging nipple 80 is combined, the sleeve An upper end of the 81 is fastened to the lower end of the packing housing 79 by a nut 87, and a piston 86 is built in the sleeve 81 so as to be moved up and down by the piston rod 20. A paint discharge check valve 8 composed of a 91 and a ball 90 is embedded in the lower end of the piston rod 20 to open and close the piston 86, and a ball housing is provided below the sleeve 81. 82), the contact housing 84, the elbow 85 is coupled in sequence, the paint pump with a paint suction check valve (7) consisting of a ball guide 88 and a ball 89 in the ball housing 82 It relates to an airless paint injection pump comprising a portion (41).

Description

Airless Paint Spray Pump

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airless paint spray pump. In particular, an airless paint for forming a coating layer by spraying a liquid paint into a high-pressure spherical fog state using a pressure-increasing device and spraying a high-speed spray on the surface of a painted product. It relates to an airless paint spray pump.

Conventional airless paint spray pump (Airless Paint Spray Pump) is compressed by the pressure regulator 102 through the operating valve 101, the compressed air supplied from the air pressure source 100 as shown in Figs. The pressure at this time is displayed on the pressure gauge 103 while the pressure is controlled.

The compressed air is supplied to the pressure-increasing cylinder piston 6 through the reverse pipe 50 of the circular direction switching valve 21 via the filter 104 and the moisture remover 105, and reverses the piston.

In addition, when the pressure-increasing cylinder piston (6) is reversed, the built-in bidirectional spring 23 of the connecting rod 30 is compressed, the splice connecting rod 22 is raised by the elastic force of the compressed bidirectional spring 23, the cylindrical direction The valve positioning protrusion 33 installed on the upper part of the switching valve 21 pushes the valve stoppers 31 and 32 provided on the left and right sides, and the pressure-increasing cylinder 24 is fixed to the forward switching position.

At this time, the compressed air of the air pressure source 100 advances the pressure-increasing cylinder piston 6 through the forward pipe 52, and the bidirectional spring 23 is compressed by the elastic force when about 90% of the forward stroke is completed. The splice connecting rod 22 is lowered, and the valve positioning protrusion 33 is fixed to the upper part of the booster cylinder 41 while pushing the left and right valve stoppers 31 and 32 outward.

Therefore, while the above-described operation is repeated, the operation valve 101 of the pressure-increasing cylinder piston 6 is opened to continuously move back and forth by compressed air.

On the other hand, the paint pump piston 15 is also moved back and forth by the stroke length by the pressure-increasing cylinder piston 6 which moves forward and backward. At this time, when the paint pump piston is reversed, the paint contained in the paint container 14 The primary compression chamber 35 of the vacuum is filled through the suction check valve 7, and when the paint pump piston is advanced, the paint suction check valve 7 is closed and the paint contained in the primary compression chamber 35 is closed. It is contained in the secondary compression chamber 36 through the open paint discharge check valve 8, and the paint as much as the volume of the booster cylinder rod 5 is discharged to the outside through the paint discharge check valve 8.

When the paint pump piston 15 is reversed, the paint having the secondary compression chamber 36 is discharged through the paint discharge check valve 8, and the paint of the paint container is transferred through the paint suction check valve 7 to the primary compression chamber. Filled with 35.

However, in the conventional airless paint spray pump, a malfunction occurs due to contaminants in a fine gap (about 3 μm) between the splice connecting rod 22 and the valve housing 24 of the circular direction control valve 21. The intermediate connecting portion connecting the piston rod 30 and the paint pump piston 15 is a rod connecting bolt 16, a coupling nut 29, a connecting rod 27, a jam nut 28, and a housing connection. Composed of a plurality of parts, such as bolt 17, not only lengthening the entire length of the injection pump, but also friction occurs in the coupling portion, there is a problem that the efficiency is reduced.

In particular, a loud noise of about 85 dB is generated when the compressed air of about 5 bar is suddenly expanded in the air, and the valve part is frozen due to the expansion of the compressive fluid, and thus there is a problem that continuous use is impossible for more than 30 minutes.

The present invention structurally does not cause malfunction of the pressure-increasing cylinder part due to contaminants, has a compact structure in which the intermediate connection part is omitted, and discharges the compressed air through the exhaust silencer, thereby lowering the noise to 65 dB as well as the valve unit. The purpose of the present invention is to provide an airless paint spray pump that can be used continuously, thereby preventing freezing.

1 is a circuit diagram showing an airless paint injection pump according to the prior art,

2 is a cross-sectional view showing an airless paint injection pump according to the prior art,

3 is a circuit diagram showing an airless paint injection pump according to the present invention;

4 is a cross-sectional view showing an airless paint injection pump according to the present invention;

5 is an exploded perspective view showing an airless paint injection pump according to the present invention.

* Description of the symbols for the main parts of the drawings *

1: Pilot pipe 2: Compressed air directional control valve

2-1: Spool 3: Forward switching pilot valve

3-1: Spring 3-2: Push rod

3-3: Switch body 4: Reverse switching pilot valve

4-1: Spring 4-2: Full Rod

4-3: switch body 5: booster cylinder rod

6: Booster cylinder piston 7: Paint suction check valve

8: Paint discharge check valve 9: Filter

10: accumulator 11: stop valve

12: filter 13: exhaust silencer

14: paint container 15: paint pump piston

16: Bolt for rod connection 17: Bolt for housing connection

18: x axis direction 19: y axis direction

20: piston rod 21: circular direction switching valve

22: spool connecting rod 23: spring

24: boosting cylinder 25: eye bolt

26: paint pump housing 27: connecting rod

28: Jam nut 29: Coupling nut

30: piston rod 31, 32: stopper

33: Valve position selection protrusion 35: 1st compression chamber

36: secondary compression chamber 38, 39: pilot pipe

40: boosting cylinder part 41: paint pump part

44: body case 50: reverse pipe

52: forward pipe 55, 56: pilot pipe

61: cover 62: stay bolt

63: punching plate 64: filter

65: cover 67: distributor

68: valve seat 69: distribution valve

70: valve housing 71: end cover

72: O-ring 73: nipple

74: base port plate 77: base plate

78: gasket 79: packing housing

80: Nipple 81: Sleeve

82: ball housing 83-1, 83-2: packing part

84: In-housing housing 85: Elbow storage

86: piston 87: joint nut

88: ball guide 89, 90: steel ball

91: spring 100: air pressure source

101: operating valve 102: pressure regulator

103: pressure gauge 104: filter

105: Dehumidifier

In order to achieve the above object, the present invention provides an airless paint injection pump, comprising: an exhaust silencer installed such that a punching plate containing a filter is introduced into an upper portion of a main body case by a cover; A compressed air directional valve configured to be disposed in the upper portion of the main body case so as to be introduced into the lower portion of the cover and to move the valve spool left and right in the valve housing attached to the lower portion of the distributor; The cylinder which is in communication with the compressed air direction switching valve by the forward and backward pipeline is built in the lower part of the main body case, the piston piston rod is built in the cylinder up and down, and the base plate is attached to the lower part of the cylinder Wow; A forward and backward switching pilot valve which is built in a base port plate installed between the valve housing and the cylinder and transfers the pressure air of the air pressure source to the compressed air direction switching valve through a pilot pipe by a rod contacting the piston of the cylinder. Wow; A packing housing having an upper end inserted into the center of the base plate so that the lower end of the piston rod moves up and down, and a paint discharge nipple is screwed to one side of an outer circumferential surface thereof; The upper end of the sleeve is fastened to the lower end of the packing housing by a nut, the piston is embedded in the sleeve to move up and down by the piston rod, the paint discharge check valve consisting of a spring and a ball to open and close the piston rod It is built in the lower end of the, the housing of the ball housing, the inlet housing, the elbow is coupled to the lower portion of the sleeve, the air pump, characterized in that the ball pump and the paint suction check valve composed of a ball suction check valve is composed of a paint pump Provide a paint spray pump.

The configuration of the present invention will be described with reference to the drawings.

Figure 3 is a circuit diagram showing an airless paint injection pump according to the present invention, Figure 4 is a cross-sectional view showing an airless paint injection pump according to the present invention, Figure 5 is an exploded perspective view showing an airless paint injection pump according to the present invention.

First, the exhaust silencer 13, in which the transport eye bolt 25 is screwed in the center of the upper surface, has a punching plate 63 having a filter 64 embedded therein while the cover 65 is fixed to the upper part of the body case 44. It is fixed by the stay bolt 62 to 61, 65, and is couple | bonded so that it may be inwardly communicated with the upper part of the compressed air direction switching valve 2 built in the main body case.

A distributor 67 is installed at the upper portion of the compressed air direction switching valve 2 built in the upper portion of the main body case 44, and a spool 2-1 for switching the air direction is provided on the lower surface of the distributor. The valve housing 70 is installed to move left and right.

A base port plate 74 is provided at the lower part of the valve housing 70, and the forward switching pilot valve 3 and the backward switching pilot valve 4 are built in the left and right sides of the base port plate, respectively.

At this time, a pilot pipe line 55, 56 is connected to the forward switching pilot valve 3 and the backward switching pilot valve 4 connected to the pilot pipe line 1, respectively, and the cylinder 24 is connected by the pilot pipe line 55, 56. It is inflated with the top of.

In the cylinder 24, the piston 6 is built up and down by the piston rod 20, and a base plate 77 having a gasket 78 attached to the upper surface thereof is attached to the lower part of the cylinder.

On the other hand, the compressed air passed through the moisture eliminator 105 is divided into a pilot pipe line (1) and a compressed air direction switching valve (2), and the pilot pipe line (1) is divided into a pilot pipe line (38, 39) again and reverse switching pilot valve (4) and the forward switching pilot valve (3), respectively.

Here, the forward switching pilot valve (3) connecting the pilot pipe (39, 55) is a compression pilot valve with a spring (3-1) is installed on the upper side is a push rod (3-2), In particular, the push rod 3-2 penetrates up and down on the upper side of the booster cylinder 24.

At this time, the push rod (3-2) is installed in the lower portion of the forward switching pilot valve (3) is attached to the lower end of the forward pressure sensor (24) while the forward switching sensor is attached to the spring (3- 1) is compressed, and then the forward switching pilot valve 3 is operated so that the compressed air of the pilot pipe line 39 moves to the pilot pipe line 55.

In addition, the reverse switching pilot valve 4 connecting the pilot pipe lines 38 and 56 is provided with a spring 4-1 between the lower surface and the central portion of the upper surface of the booster cylinder 24. 4) the reverse switching sensor is attached to the lower end of the pull rod (4-2) which is fixed to the lower surface of 4), and the lower end of the reverse switching sensor penetrates the upper surface of the boosting cylinder to the center of the boosting cylinder piston (6). Are combined.

At this time, the float 4-2 is pulled in the state where the booster cylinder piston 6 is advanced about 90% in the booster cylinder 24, and is pulled downward by the pull rod to operate the reverse switching pilot valve 4 ) Passes the compressed air of the pilot pipe 38 to the pilot pipe 56.

On the other hand, the front and rear inlet pipes 52 and 50 whose upper ends are respectively connected to the compressed air direction switching valve 2 are connected to the lower left and upper left sides of the booster cylinder 24, respectively, so that they are moved forward and backward to the booster cylinder. The built-in pressure-increasing cylinder piston 6 is advanced by the compressed air sucked from the forward pipe 52, and is reversed by the compressed air sucked from the backward pipe 50.

The compressed air discharged while the pressure-increasing cylinder piston 6 is advanced back and forth is discharged to the exhaust silencer 13 through the compressed air direction switching valve 2, and the compressed air introduced into the exhaust silencer is released into the atmosphere while expanding.

On the other hand, the upper part of the packing housing 79 is inserted and fixed in the central hole of the base plate 77, and the upper end of the sleeve 81 is coupled by the joint nut 87 to the lower end of the packing housing 79, An upper end of the ball housing 82 is externally screwed to the lower end of the sleeve, and an inlet housing 84 and an elbow tube 85 are screwed together to the lower part of the ball housing 82.

At this time, the lower end of the piston rod 20 is inserted into the packing housing 79 in which the packing part 83-1 consisting of a plurality of packings is moved up and down while maintaining airtightness, and the lower end of the piston rod 20 The piston 86 for the paint pump coupled to the upper and lower surfaces of the sleeve 81 is moved up and down in a state in which airtightness is maintained by the packing part 83-2.

Here, the paint discharge check valve 8 is raised by the high pressure paint discharged to the upper portion of the paint pump piston 86, the ball 90 built in the lower end of the piston rod 20 through the nipple 80 When the paint is discharged again, the ball 90 is lowered by the spring 91 to close the upper end of the paint pump piston 86.

In addition, the paint suction check valve 7 opens and closes the upper portion of the inlet housing 84 by the paint pump piston 86 with the ball 89 embedded in the ball housing 82 by the ball guide 88. Done.

Hereinafter, the operation of the present invention.

The compressed air supplied from the air pressure source 100 is controlled to an appropriate pressure in the pressure regulator 102 via the operation valve 101, and the pressure at this time is displayed on the pressure gauge 103, and again the filter 104 and the moisture. Pass through the eliminator 105 in turn.

The compressed air passing through the moisture remover 105 is supplied to the front of the boost cylinder 6 through the reverse pipe 50 of the directional valve 2 to reverse the boost cylinder piston, and at the same time the pilot pipe 38 , 39).

In addition, as the booster cylinder piston (6) is reversed, a portion of the upper surface pushes the push rod (3-2), compresses the spring (3-1), and then operates the pilot forward switching valve (4), and the pilot forward As the pressure is transmitted to the pilot pipe 55 by the operation of the switching valve, the right side of the spool 2-1 is pushed.

At this time, as the compressed air direction switching valve (2) is switched to the position 19 of y, the compressed air is supplied to the rear portion of the boost cylinder piston (6) through the forward pipe (52), and the compressed air supplied to the rear portion The boost cylinder piston moves forward.

Here, the compressed air supplied through the reverse pipe line 50 for the reverse of the booster cylinder piston 6 is discharged to the atmosphere through the exhaust silencer 13 as the forward of the booster cylinder piston 6.

Meanwhile, the pressure-increasing cylinder piston 6, which is advanced by the compressed air delivered through the forward pipe 52, pulls the pull rod 4-2 installed in the center at the time of the forward movement, compressing the spring 4-1, and retracting the pilot. The switching valve 4 is operated.

Then, as the pilot reverse switching valve 4 is opened, the compressed air is supplied to the opposite pilot pipe line 56 through the pilot pipe line 38, and then the left side of the spool 2-1 is pushed.

At this time, the compressed air direction switching valve (2) is switched to the position 18 of x by the spool (2-1) moved to the right side, and the compressed air is the front part of the boost cylinder piston (6) through the reverse pipe (50) The pressure-increasing cylinder piston is reversed by the compressed air supplied to and supplied to the front part.

Here, the compressed air supplied through the forward pipe line 52 for the forward of the booster cylinder piston 6 is discharged to the atmosphere through the exhaust silencer 13 through the forward pipe line to the reverse of the booster cylinder piston 6.

Meanwhile, the pressure-increasing cylinder rod 20 fixed to the front center portion of the pressure-increasing cylinder piston 6 is moved back and forth by the pressure-increasing cylinder piston, which is advanced back and forth. When the pressure-increasing cylinder rod 20 is reversed, it is contained in the paint container 14. While the paint is sucked through the suction check valve 7, it is filled in the primary compression chamber 35.

When the pressure-increasing cylinder rod 20 is advanced, the paint suction check valve 7 is closed to open the paint discharge check valve 8, and the paint contained in the primary compression chamber 35 is transferred through the paint discharge check valve 2. The differential compression chamber 36 is filled.

At this time, as the booster cylinder rod 20 is reversed, the paint discharge check valve 8 is closed, and the paint of the secondary compression chamber 36 is discharged to the outside, and at the same time, the paint suction check valve 7 is opened, and the paint container 14 ) Is filled in the primary compression chamber (35).

By such continuous repetitive operation, the paint is continuously discharged to the outside by the inner volume of the secondary compression chamber 36.

At this time, the cross-sectional area ratio of the pressure-increasing cylinder rod 5, which is the compression ratio, is as follows.

In other words,

Compression Ratio at Forward = Cross Section Area = A1 / A2

Compression ratio in reverse = cross-sectional area ratio = A2 / (A3-A4) = (A1-A4) / (A3-A4)

The present invention structurally does not cause malfunctions due to air pollutants, and has a compact structure in which the intermediate connection is omitted, thereby reducing manufacturing cost and reducing the frequency of failure, and exhausting compressed air through the exhaust silencer In addition to lowering up to 65dB, it also prevents freezing of the valve unit, resulting in the effect of continuous use.

Claims (1)

In the airless paint spray pump, An exhaust silencer 13 in which a punching plate 63 incorporating the filter 64 is installed to be introduced into the upper portion of the main body case 44 by the covers 61 and 65; The distributor 67 is built in the upper part of the main body case 44 so as to be inwardly communicated with the lower part of the cover 65 and the valve spool (2-) in the valve housing 70 attached to the lower part of the distributor 67. 1) the compressed air direction switching valve (2) is built so as to move left and right; The cylinder 24, which is internally communicated with the compressed air direction switching valve 2 by the front and rear inlet pipes 52 and 50, is built in the lower part of the body case 44, and the piston 6 and the piston 24 are connected to the cylinder 24. A booster cylinder part 40 having a piston rod 20 mounted up and down and having a base plate 77 attached to a lower portion of the cylinder 24; Air is built into the base port plate 74 installed between the valve housing 70 and the cylinder 24 to allow air to be contacted by the rods 3-2 and 4-2 contacting the piston 6 of the cylinder 24. Forward and backward forwarding pilot valves 3 and 4 for delivering the pressure air of the pressure source 100 to the compressed air direction switching valve 2 through pilot pipes 55 and 56; A packing housing 79 in which an upper end is inserted and fastened to the center of the base plate 77 so that the lower end of the piston rod 20 is moved up and down, and the paint discharge nipple 80 is screwed to one side of an outer circumferential surface thereof; An upper end of the sleeve 81 is fastened to the lower end of the packing housing 79 by a nut 87, and a piston 86 is embedded in the sleeve 81 to be moved up and down by the piston rod 20. A paint discharge check valve (8) consisting of a spring (91) and a ball (90) is built in the lower end of the piston rod (20) to open and close the piston (86), and the ball housing in the lower portion of the sleeve (81). (82), the inlet housing (84), the elbow (85) is coupled in sequence, the paint intake check valve (7) consisting of a ball guide 88 and the ball (89) is built into the ball housing (82) Airless paint injection pump, characterized in that consisting of a pump (41).