KR101708717B1 - Driving device of airless pump for spraying paint - Google Patents

Abstract

The present invention relates to a driving device of an airless pump for pumping paint and, more specifically, to a driving device of an airless pump for pumping paint, which provides compressed air by transferring the same to an upper portion or a lower portion of a cylinder provided therein, and accurately senses a top dead center (TDC) and a bottom dead center (BDC) of the piston to achieve the transfer of compressed air while the piston reciprocates, thereby improving pumping force and significantly reducing a rate of minor failures. According to the present invention, since the compressed air is transferred to the upper part of the lower part of the cylinder and supplied, a sensor member provided on an outer surface of the cylinder precisely senses the TDC and BDC of the cylinder to let the compressed air transferred when the driving device makes the cylinder provided therein reciprocate. Accordingly, separate friction, shock, and contact do not occur during the sensing while the pumping force is improved, so a rate of minor failures may be considerably reduced.

Description

Technical Field [0001] The present invention relates to an airless pump for spraying paint,

More particularly, the present invention relates to a driving apparatus for an airless pump for pumping paint, and more particularly, to an apparatus for driving an airless pump for pumping paint, The present invention relates to a driving apparatus for an airless pump for pumping paint, which is capable of accurately detecting a point by a sensor to convert compressed air to improve a pumping force,

Generally, an airless pump for pumping paint is used to paint a vessel at a shipyard or to paint a paint on an outer wall of a building or the like, and is operated by using compressed air as a power source. On the other hand, the paint is a generic term for various paints and is also used for a high-viscosity fluid such as a sealant.

On the other hand, a number of airless pumps have been proposed in the prior art. Among them, the present invention is an airless pump for painting paint of Korean Patent Registration No. 10-1506261 (published on May 20, 2014), which is filed and registered by the present applicant. With reference to this publication, it is a proposed invention to prevent a pulsation phenomenon by supplying a large amount of compressed air at a time in a state where compressed air supplied for a piston operation is stored in a separate auxiliary container. According to this publication, it is possible to supply a large amount of compressed air at one time, which can prevent the pulsation phenomenon, but it is inconvenient to precisely adjust the timing of supplying the compressed air.

A pneumatic pump of Korean Patent Publication No. 10-2016-0051996 (published on May 12, 2016) is proposed to solve such a problem. With reference to this publication, a switching member is provided on the upper and lower sides of the housing, and when the piston touches the switching member at the top dead center or the bottom dead center, the switching member is recognized to supply the compressed air by switching.

According to this publication, the top dead center and the bottom dead center of the piston can be recognized, and the compressed air can be switched at the correct point. However, there is a disadvantage that the piston has a somewhat higher residual rate due to touching the switching member.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-described problems, and it is an object of the present invention to provide an air conditioner which, by switching compressed air to an upper portion or a lower portion of a cylinder, The present invention also provides a driving apparatus for an airless pump for pumping paint, which improves the pumping force by switching the compressed air by sensing accurately.

According to an aspect of the present invention, A cylinder provided on the upper side of the frame and having first and second transporting passages at upper and lower portions thereof; A piston coupled to an upper end of the piston rod extending downward to the lower side of the cylinder and having a magnet mounted on one side of the upper surface thereof; A direction switching valve body connected to the first and second transfer conduits of the cylinder for selectively raising and lowering the piston by selectively supplying main compressed air supplied from the outside to upper and lower sides of the cylinder; An upper sensor provided on the outer side surface of the cylinder for sensing the magnet to generate a signal that the piston reaches a top dead center, and a sensor provided below the outer surface of the cylinder for sensing the magnet, A sensor member comprising a lower sensor for generating a signal that has arrived; A control valve member for controlling the direction switching valve body to selectively supply the main compressed air by a sensing signal of the sensor member outside the cylinder; And a guide member mounted on the piston rod and having a rail groove formed in the upper and lower directions and a guide plate fixedly mounted on the frame and connected to the rail groove to restrict rotation of the piston rod, A first pneumatic valve provided on the upper side of the cylinder, the first pneumatic valve being connected to one side of the directional switching valve body through a first auxiliary conduit and being opened and closed by a signal of the upper sensor; A second pneumatic valve provided below the cylinder and connected to the other side of the directional switching valve body via a second auxiliary conduit and opened and closed by a signal from the lower sensor; And an auxiliary supply pipe for supplying the auxiliary compressed air to the first and second pneumatic valves by receiving the main compressed air.

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According to the present invention, when the piston is reciprocated vertically by supplying compressed air to the upper portion or the lower portion of the cylinder, the sensor member provided on the outer surface of the cylinder accurately detects the top dead center and the bottom dead point of the piston, The pumping force is improved while the air is changed, but no friction or impact is generated during the sensing process, and thus the occurrence rate of the residue is greatly reduced.

1 is a perspective view of an entire airless pump to which an apparatus for driving an airless pump for pumping paint according to a preferred embodiment of the present invention is applied.
2 is a perspective view of a driving apparatus for an airless pump for pumping paint according to a preferred embodiment of the present invention.
3 is a cross-sectional view taken along the line AA of FIG. 1 illustrating the inside of a driving apparatus according to a preferred embodiment of the present invention.
FIG. 4 is a perspective view of a piston according to a preferred embodiment of the present invention. FIG.
5 is an enlarged perspective view showing a directional switching valve body and a control valve member according to a preferred embodiment of the present invention.
6 is a cross-sectional view showing the inside of a directional switching valve body according to a preferred embodiment of the present invention.
FIG. 7 is a schematic vertical sectional view showing a state in which the piston is positioned at a bottom dead point in an operation of the airless pump for pumping paint according to a preferred embodiment of the present invention; FIG.
FIG. 8 is a schematic view showing a flow of compressed air for a piston to be lifted at a bottom dead center according to a preferred embodiment of the present invention. FIG.
9 is a schematic vertical sectional view showing a state in which the piston reaches a top dead center during operation of the air piston pump for pumping paint according to a preferred embodiment of the present invention.
10 is a schematic view showing a flow of compressed air after a piston reaches a top dead center according to a preferred embodiment of the present invention.

Hereinafter, a driving apparatus for an airless pump for pumping paint according to the present invention will be described in detail with reference to the accompanying drawings.

Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of terms in order to describe their invention in the best way. It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It should be understood that various equivalents and modifications may be present.

1 is a perspective view showing an entire airless pump to which an apparatus for driving an airless pump for pumping paint according to a preferred embodiment of the present invention is applied.

Referring to the drawings, the entire airless pump 10 is shown. The airless pump 10 is mainly composed of a driving device 100 and a pumping part 200. The driving device 100 of the airless pump 10 of the present invention is pumped through a piston rod 132, The upper cylinder 210 is inserted into the lower cylinder 210 of the unit 200 and the lower cylinder 210 is used to pump the paint stored in the paint reservoir 300 and discharge the paint through the paint outlet 220 The paint discharge port 220 is usually provided with a spray nozzle for spraying paint to a desired location. At this time, although not shown in the lower cylinder 210, a pumping piston is built in and the piston rod 132 is connected to the pumping piston so as to be repeatedly operated in a vertical direction to enable a pumping operation. The construction and operation of the airless pump of the present invention will be described in detail below with reference to the prior art described above. Therefore, the airless pump driving apparatus 100 of the present invention will be described in detail below.

2 is a perspective view of a driving apparatus for an airless pump for pumping paint according to a preferred embodiment of the present invention, FIG. 3 is a cross-sectional view taken along line AA of FIG. 3 illustrating the inside of a driving apparatus according to a preferred embodiment of the present invention, FIG. 5 is an enlarged perspective view showing a directional switching valve body and a control valve member according to a preferred embodiment of the present invention, and FIG. 6 is a cross-sectional view of a preferred embodiment of the present invention. Is a transverse sectional view showing the inside of the directional switching valve body according to the example.

2 and 3, the airless pump driving apparatus 100 of the present invention mainly includes a frame 110, a cylinder 120, a piston 130, a direction switching valve body 140, a sensor member 150, A control valve member 160, and a guide member 170. As shown in Fig.

First, the frame 110 is provided for installing the cylinder 120 and the guide member 170. The shape and configuration of the frame 110 may be variously formed according to installation conditions, and the present invention is not limited thereto.

Next, the cylinder 120 is installed on the upper side of the frame 110, and the first and second transfer conduits (not shown) for supplying compressed air to the upper and lower sides of the cylinder 120, 122 and 124 are provided.

3, the piston 130 is divided into upper and lower spaces inside the cylinder 120, and is coupled to the upper end of the piston rod 132. In particular, as shown in FIG. 4, A magnet 134 is mounted on one side of the upper surface and a packing is mounted on the side surface of the piston 130 along the shape of the piston 130. The piston 130 is in close contact with the inner wall of the cylinder 120 and the piston rod 132 extends downward through the lower side of the cylinder 120. The lower side of the downwardly extending piston rod 132 is inserted into the lower cylinder 210 of the pumping unit 200 as described above and connected to a pumping piston not shown.

4, the directional switching valve body 140 is mounted on the upper side of the cylinder 120 and connected to the first and second transfer conduits 122 and 124 of the cylinder 120, And selectively supplying the main compressed air supplied to the upper and lower sides of the cylinder to move up and down the piston 130 provided in the cylinder 120.

The directional control valve body 140 is described in the prior art and will be briefly described below.

5 and 6, the directional control valve body 140 includes a housing 141 and a directional control valve 149. A main inlet 142 for introducing main compressed air into the interior of the housing 141 is formed at a rear surface of the housing 141. A first inlet port 142 is connected to the first conveying line 122 at a front side of the housing 141, And a second inlet 144 connected to the second conveying line 124 for supplying main compressed air is formed on the other side of the first compression chamber 143 and a second inlet 144 for supplying compressed air And two outlets 145 and 146, respectively.

The directional control valve 149 is provided inside the housing 141 and moves in the leftward and rightward directions to move the main inlet 142 and the first inlet 143 into communication with each other, The main inlet 142 and the second inlet 144 are communicated with each other so that the compressed air is supplied selectively to the upper or lower portion of the cylinder 120 through the first and second inlets 143 and 144 . The second inlet 144 and the second outlet 146 are configured to communicate with each other when the main inlet 142 and the first inlet 143 are positioned so as to communicate with each other. The main inlet 142 and the second inlet 143 144 are configured to communicate with each other, the first inlet 143 and the first outlet 145 are configured to communicate with each other. This is because the residual air inside the cylinder 120 is discharged to the outside through the second inlet 144 and the second outlet 146 when the compressed air is introduced through the first inlet 143, When the compressed air is introduced through the first inlet 143 and the first outlet 145, the residual air is discharged. The working relationship of this will be described below again.

At this time, the directional control valve 149 is required to move left and right to selectively supply the main compressed air, which can be moved by a separate motor or moving means (pneumatic cylinder) Compressed air is used. On the other hand, the compressed air supplied to operate the directional control valve 149 for distinguishing the compressed air conveyed to the main inlet 142 is collectively referred to as auxiliary compressed air. A first auxiliary inlet 147 and a second auxiliary inlet 148 are formed on both sides of the housing 141. When auxiliary compressed air flows into the first auxiliary inlet 147, The directional control valve 149 is moved to the right side and the directional control valve 149 is moved to the left side when it flows in through the second auxiliary inlet 148. This auxiliary compressed air is supplied through a separate control valve member 160 different from the main compressed air, which will be described below.

5, the sensor member 150 is disposed on the outer side surface of the cylinder 120 to sense the magnet 134 of the piston 130, An upper sensor 152 for generating a signal reaching the top dead center and a magnet 134 provided below the outer surface of the cylinder 120 to sense a magnet provided on the piston 130, And a lower sensor 154 for generating a signal reaching the point. Thus, the upper dead point and the bottom dead point of the piston 130 are accurately sensed. At this time, the signal sensed by the sensor member 150 is used as a signal for operation of the control valve member 160, which will be described later.

Next, the control valve member 160 controls the direction switching valve body 140 to selectively supply the main compressed air by a sensing signal of the sensor member 150 from the outside of the cylinder 120 5, the control valve member 160 includes a first pneumatic valve 161, a second pneumatic valve 162, and an auxiliary supply line 163.

The first pneumatic valve 161 is provided on the upper side of the cylinder 120 and is connected to a first auxiliary inlet port (not shown) formed on one side of the housing 141 of the directional control valve body 140 through a first auxiliary conduit 164 147 to be opened and closed by a signal of the upper sensor 152. The second pneumatic valve 162 is provided below the cylinder 120 and is connected to the second auxiliary inlet 165 formed on the other side of the housing 141 of the directional control valve body 140 via the second auxiliary conduit 165 148 and is operated to open and close by the signal of the lower sensor 154. The auxiliary supply pipe path 163 is for supplying auxiliary compressed air to the first and second pneumatic valves 161 and 162 and may be configured to be introduced into the pipe through which the main compressed air is supplied.

The operation of the control valve member 160 constructed as described above will be described below.

Lastly, the guide member 170 is provided to prevent the piston 130 from rotating when the piston 130 is repeatedly moved up and down. This is because, when the piston 130 rotates, the magnet 134 provided on the upper surface and the sensor member 150 provided on one side of the cylinder 120 are separated from each other and can not be sensed. The guide member 170 includes a rail 172 formed on the lower side of the piston rod 132 and formed with a rail groove 173 cut in the vertical direction and a rail 172 fixed to the frame 110, 173 for guiding the piston rod 132 and the piston 130 so that the piston rod 132 and the piston 130 can be moved only in the vertical direction without being rotated.

Hereinafter, the operation of the airless pump driving apparatus of the present invention will be described in more detail.

FIG. 7 is a schematic vertical sectional view showing a state where the piston is positioned at a bottom dead point of an operation of the airless pump for pumping paint according to a preferred embodiment of the present invention, and FIG. 8 is a cross- FIG. 9 is a schematic view showing the flow of compressed air for the piston to be lifted at the bottom dead center according to a preferred embodiment of the present invention. FIG. 9 is a schematic view showing the operation of the airless pump for pumping paint according to the preferred embodiment of the present invention, FIG. 10 is a schematic view showing the flow of compressed air after the piston reaches the top dead center according to a preferred embodiment of the present invention. FIG.

7 and 8, the main compressed air is continuously introduced into the main inlet 142 of the directional control valve body 140, and the auxiliary supply line 163 of the control valve member 160 is provided with auxiliary The compressed air is continuously flowing. The lower sensor 154 of the sensor member 150 provided on the outer surface of the cylinder 120 is positioned at the bottom dead center of the piston 130 And generates a bottom dead center (TDC) signal of the piston 130. As shown in FIG.

Then, this signal is recognized by the first pneumatic valve 161 and the second pneumatic valve 162 of the control valve member 160 so that the first pneumatic valve 161 is kept closed, 2 pneumatic valve 162 is opened. The auxiliary compressed air supplied through the auxiliary supply line 163 flows through the second auxiliary inlet 165 provided on the right side of the housing 141 of the directional control valve body 140 through the second auxiliary line 165 Respectively. The directional switching valve 149 provided in the housing 120 is moved to the left side of the housing 120 so that the main inlet 142 and the second inlet 144 of the housing 141 communicate with each other, The main compressed air flowing into the inlet port 142 is transferred through the second inlet port 144 and the second transfer pipeline 124 to be supplied from the lower side of the cylinder 120 to the inside thereof. The piston 130 will be actuated in an upward direction due to the compressed air supplied from the lower side of the cylinder 120. In this process, the residual air in the upper part of the cylinder 120 in the ascending operation of the piston 130 flows through the first transfer conduit 122 into the first inlet 143 of the housing 141 and the first outlet 143, (145). ≪ / RTI >

9 and 10, the piston 130 will reach the top dead center. This time, the upper sensor 152 of the sensor member 150 provided above the outer surface of the cylinder 120 is moved to the piston (not shown) 130), and at the same time, generates a top dead center point arrival signal. This signal is then recognized by the first pneumatic valve 161 and the second pneumatic valve 162 and the second pneumatic valve 162 which has been opened via this is closed and the first pneumatic valve 161 is opened The auxiliary compressed air supplied through the auxiliary supply line 163 is supplied to the first auxiliary inlet 162 provided on the left side of the housing 141 of the directional switching valve body 140 via the first auxiliary line 164 147). The main inlet 142 and the first inlet 143 of the housing 141 are communicated with each other at this time so that the direction switching valve 149 provided inside the housing 141 is moved to the right The compressed air flowing into the main inlet 142 is transferred through the first inlet 143 and the first transfer conduit 122 and supplied from the upper side of the cylinder 120 to the inside. Due to the compressed air supplied above the cylinder 120, the piston 130 will be lowered again. During the lowering operation of the piston 130, the residual air in the lower portion of the cylinder 120 passes through the second transfer pipe 124 to the second inlet 144 of the housing 141 and the second outlet 144 communicated with the second inlet 144, (146).

As a result, the piston 130 and the piston rod 132 axially coupled thereto are moved up and down to perform the pumping operation. Here, the piston 130 and the piston rod 132, which are axially coupled to each other, So that the pumping piston can be moved up and down to pump the paint. The guide member 170 or the guide plate 174 provided below the repeated upward and downward movement of the piston 130 is connected to the rail groove 173 of the rail 172, 130 will not be rotated but will ascend and descend on the same vertical line so that accurate sensing of the sensor member will occur.

As a result, when the compressed air is switched to the upper portion or the lower portion of the cylinder 120, the top dead center and the bottom dead point of the piston 130 are moved in the vertical direction The sensor is accurately sensed by the upper / lower sensors 152 and 154 to convert the compressed air, thereby improving the pumping force. However, since no contact such as friction or shock is generated during the sensing process, can do.

The foregoing has outlined rather broadly the features and technical advantages of the present invention in order that the claims of the invention to be described below may be better understood. Additional features and advantages that constitute the claims of the present invention will be described in detail below. It should be appreciated by those skilled in the art that the disclosed concepts and specific embodiments of the invention can be used immediately as a basis for designing or modifying other structures to accomplish the invention and similar purposes.

It is also to be understood that such modified or altered equivalent structures by those skilled in the art as a basis for modifying or designing the invention to the other structures for carrying out the same purpose of the invention disclosed in the present invention, It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit or scope of the invention as defined by the appended claims.

10: Air-leaf pump 100: Airless pump driving device
110: frame 120: cylinder
122: first conveying duct 124: second conveying duct
130: Piston 132: Piston rod
134: magnet 140: direction selector valve body
141: housing 142: main inlet
143: first inlet 144: second inlet
145: first outlet 146: second outlet
147: first auxiliary inlet 148: second auxiliary inlet
149: Direction switching valve 150: Sensor member
152: upper sensor 154: lower sensor
160: control valve member 161: first pneumatic valve
162: second pneumatic valve 163: auxiliary supply pipe
164: first auxiliary conduit 165: second auxiliary conduit
170: guide member 172: rail
173: rail groove 174: guide plate
200: pumping unit 210: lower cylinder
220: Paint outlet 300: Paint reservoir

Claims (3)

frame;
A cylinder provided on the upper side of the frame and having first and second transporting passages at upper and lower portions thereof;
A piston coupled to an upper end of the piston rod extending downward to the lower side of the cylinder and having a magnet mounted on one side of the upper surface thereof;
A direction switching valve body connected to the first and second transfer conduits of the cylinder for selectively raising and lowering the piston by selectively supplying main compressed air supplied from the outside to upper and lower sides of the cylinder;
An upper sensor provided on the outer side surface of the cylinder for sensing the magnet to generate a signal that the piston reaches a top dead center, and a sensor provided below the outer surface of the cylinder for sensing the magnet, A sensor member comprising a lower sensor for generating a signal that has arrived;
A control valve member for controlling the direction switching valve body to selectively supply the main compressed air by a sensing signal of the sensor member outside the cylinder; And
A guide member mounted on the piston rod and having a rail groove formed in an upper and lower direction and a guide plate fixedly mounted on the frame and connected to the rail groove to restrict rotation of the piston rod,
The control valve member
A first pneumatic valve provided on the upper side of the cylinder and connected to one side of the directional switching valve body via a first auxiliary conduit and opened and closed by a signal of the upper sensor;
A second pneumatic valve provided below the cylinder and connected to the other side of the directional switching valve body via a second auxiliary conduit and opened and closed by a signal from the lower sensor; And
An auxiliary supply pipe for receiving the main compressed air and supplying auxiliary compressed air to the first and second pneumatic valves;
And an air pump for pumping the paint. delete delete

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