JPS5813962Y2 - Pump device in airless sprayer - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improved structure of a pump device in an airless sprayer that is not equipped with a compressor, and aims to improve the pumping action by making the device completely airtight, and to construct it economically. This is the purpose.

Generally speaking, the seed sprayer has a housing 1 as shown in the first diagram.
An armature 3 is arranged on the solenoid coil 2 housed in the housing 1 to form an electromagnetic device, and a switch 5 is attached to a part of the grip 4 extending integrally from the housing 1 to apply an alternating current voltage to the solenoid coil 2. By doing this, the armature 3 can be moved in an arc with its upper part as a fulcrum, and the main body 7 with the cylinder 6 embedded in the housing 1 in a direction almost perpendicular to the grip 4 is fixed with the set screw 8.
A piston 9 is inserted and supported into the cylinder 6 from the rear of the cylinder 6, and a spring 10 is elastically installed between the cylinder 6 and the piston 9, so that the piston 9 is moved by the elastic action of the spring 10 to the armature 3. It is possible to move reciprocatingly within the cylinder 6 by cooperating with the end of the housing 1, and furthermore, a lid 11 is formed on the lower side of the housing 1, and a container 12 for storing liquid paint etc. is screwed and suspended. From the cylinder 6 to the container 1
A valve cone 15 is attached to the spring 1 to form an inlet 13 and an outlet 14 to the cylinder 2, and a valve cone 15 that acts as a valve on the tip side of the cylinder 6.
A nozzle 17 is formed at the end of the main body I, which is formed in close contact with the cylinder 6 due to the elastic action of the main body I, and is located on the distal end side of the cylinder 6.

Further, a suction pipe 18 is inserted into the suction port 13, and the suction pipe 18 is inserted into the suction port 13.
8 is guided into the container 12 and arranged.

A case 19 is formed to cover movable parts such as the electromagnetic device and the piston 9, and continues with the case 19 to form the other portion 4A of the grip 4 formed on the housing 1.

Further, an adjustment knob 20 is screwed to the case 19 to define the amplitude distance of the armature 3 and adjust the state of the liquid mist sprayed from the nozzle 17. Due to the distance interval between the position of the locking part 21 formed in the housing 1, where the armature 3 is attracted and stopped when the armature 3 is attracted, and the abutment position of the tip of the adjustment knob 20, where the armature 3 separates from the solenoid coil 2 side and stops. It is determined.

As configured above, the paint is sprayed from the container 12 through the suction pipe 18 by the reciprocating movement of the armature 3 and the piston 9 by the solenoid coil 2 and the spring 10, that is, by the pumping action by the suction and compression strokes of the piston 9 within the cylinder 6.
The paint is sucked into the cylinder 6 through the
The valve cone 15 sealed at the tip of the cylinder 6 is separated from the cylinder 6 against the force of the spring 16, and the paint is sprayed from the small gap, and is further sprayed from the nozzle 17 as is well known. It is configured to do so.

By the way, in the above pump device, the armature 3 is attracted by the excitation of the solenoid coil 2 formed in the electromagnetic device, and the armature 3 and \
When the piston 9 moves forward and the excitation of the coil 2 is cut off, the armature 3 and the piston 9 elastically return to their original positions by the force of the spring 10.

At this time, the valve cone 15 closes the opening at the tip in the axial direction of the cylinder 6 via the spring 16 in conjunction with the movement of the piston 9, which moves backward by the force of the spring 10, thereby performing a valve action. The paint in the container 12 is sucked into the cylinder 6 from the suction port 13 via the suction pipe 18 due to the negative pressure action within the cylinder 6 accompanying this.

Next, as described above, the excitation of the coil 2 causes the pistons 9 of both the armatures 3 and The valve cone 15 opens against the force of the spring 16, and the paint is sprayed to the nozzle 17 side, and the paint is further sprayed from the nozzle 17. By repeating the above operation at a high speed, the paint is sprayed. work is done.

Therefore, when the inside of the cylinder 6 is brought into a negative pressure state with the backward movement of the piston 9 and the paint is sucked into the cylinder 6, this negative pressure is obtained by the elastic return force of the spring 10. In order to obtain that high negative pressure, even stronger spring pressure is required to overcome the negative pressure.

Therefore, the electromagnetic device that is driven by compressing and releasing the spring 10 with a large spring constant must be strongly attracted by the attraction force of the armature 3 caused by the excitation of the solenoid coil 2, and by setting the capacity of the electromagnetic device large, As a result, electromagnetic devices naturally became larger.

In addition, with the use of a larger button in the electromagnetic device and a spring 10 with a large spring constant, the attraction force due to the excitation of the solenoid coil 2 torsioned during the amplitude motion of the armature 3 increases, and the armature 3 is caused by intense momentum and force. When the armature 3 collides with the locking part 21, the strong force of the spring 10 returns the armature 3 to the position where the tip of the adjustment knob 20, which is located on the opposite side, collides with the collision part 21. The vibrations and noise of the device became intense, causing discomfort.

The present invention has been devised by paying attention to the above-mentioned problem, and an embodiment of the present invention will be described below in detail with reference to FIG.

In the figure, 6 is a cylinder, 13 is an inlet port formed at the front lower side of the cylinder 6 and communicates with the paint storage container 12, and 14 is an inlet port formed at the rear lower side of the cylinder 6 and connected to the container 12. 9 is a piston inserted into the cylinder 6 from the rear side of the cylinder 6, 10 is a spring elastically installed between the cylinder 6 and the piston 9, and 15 is a distal end side of the cylinder 6. 16 is a spring that elastically presses and holds the valve cone 15 toward the cylinder 6; 11 is a lid body formed on the lower side of the cylinder 1; 22; is a communicating hole formed in the lid 11 that is continuous with the suction port 13 formed in the cylinder 6, and a threaded portion 23 is formed on the peripheral surface of the rising wall of the communicating hole 22.

The numeral 24 designates an engagement tube that is screwed into the threaded portion 23, and the engagement tube 24 has a small hole 24A formed in the lower part of the communication hole 22 and approximately in the center thereof. A large-diameter insertion hole 24B is formed at the lower side thereof.

Further, 25 is a pulp stored in a communication hole 22 formed in the lid 11, and the valve 25 is a spring 2.
6 elastically closes and holds the small hole 24A of the engagement cylinder 24.

Note that a suction pipe 18 for sucking up liquid is inserted into the insertion hole 24B of the engagement cylinder 24.

The operation in the above configuration will be explained. ○ During the amplitude operation of the armature 3, the piston 9
During the backward movement at position 1 shown in solid line, the valve cone 15 located at the tip side of the cylinder 6 is in a resilient state by the spring 16 and seals the cylinder 6.

Therefore, a negative pressure is generated in the cylinder 6 both when the piston 9 moves backward and when the piston 9 moves backward.

Next, the tip of the piston 9 connects to the suction port 13 at the bottom of the cylinder 6.
To release the paint, the negative pressure acts as a pump to cause the paint to flow in from the suction pipe 18, and the negative pressure causes the paint to flow into the engagement tube 24.
A valve 25 elastically sealed in the small hole 24A opens the gap between the small hole 24A and the small hole 24A against the force of the spring 26, and when the valve 25 opens, paint from the suction pipe 18 enters the small hole 24A. It flows into the cylinder 6 through the inlet 13.

When the broken piston 9 retreats exactly at the solid line position 1 and the paint flows into the cylinder 6 and fills it, the negative pressure inside the cylinder 6 disappears, and the valve 25 elastically seals the small hole 24A by the spring 26. do.

Next, while the piston 9 moves forward at the position 1 indicated by the broken line in the figure, the paint in the cylinder 6 remains in a compressed state, and both the compression and
is pressed and moved, a small gap is created between the cylinder 6 and the valve cone 15, and the compressed paint is injected from the small gap between the cylinder 6 and the valve cone 15 to the nozzle 17 side, and then to the nozzle 1.
7 to the outside.

At this time, the valve 25 keeps the small hole 24A closed by the force of the spring 260, and the paint that has once flowed into the cylinder 6 is transferred to the container 1 by the valve action of the valve 25.
It can be constructed without returning to the side, and the pumping action can be performed favorably by the suction and compression strokes accompanying the forward and backward movement of the piston 9 within the cylinder 6, that is, the reciprocating motion. In response to the valve action of the small hole 24A, the spring 26 prevents the valve 25 from floating at the small hole 24A position of the engagement tube 24 when the spray device vibrates or tilts, and the spring 26 has an extremely weak force. The valve 25 is closed in the small hole 24A by the weak spring 26, and then the gap between the valve 25 and the small hole 24A is opened, and the paint in the container 12 is drawn into the suction pipe 18. Through cylinder 6
The pumping action, that is, the negative pressure that causes the piston 9 to move back and forth can be provided by a low negative pressure that overcomes the elastic force of the weak spring 26. In other words, the spring constant of the spring 10 that causes the piston 9 to move back and forth can be reduced. Also, the piston 9 can be reliably moved backward and negative pressure can be obtained, allowing paint to flow into the cylinder 6.

Therefore, by using the spring 10 with a small spring constant, it is possible to weaken the elastic return force of the piston 9 that returns due to the elastic force of the spring 10 when the excitation of the electromagnetic device is cut off, and the backward movement of the piston 9 can be weakened. The armature 3 of the electromagnetic device that returns in conjunction with the adjustment knob 20 can similarly weaken the impact force that is restricted from colliding with the tip contact position of the adjustment knob 20, and by suppressing the impact force, the vibration imparted to the case 19 side can be reduced. ,
Furthermore, impact noise caused by collisions can be suppressed.

Furthermore, by configuring a pump device that sucks up paint with a low negative pressure as described above, the spring constant of the spring 10 formed in the pump device can be set small, and the force of the spring 10 can be resisted. Thus, the attraction force of the solenoid coil 2 that drives the armature 3 and the piston 9 can be similarly suppressed.

Therefore, by lowering the capacity of the solenoid coil 2, the electromagnetic device can be made smaller and lighter, and the overall structure of the spray device can be made more compact. It is possible to reduce the impact force and impact noise that collides with the locking portion 21 formed in the housing 1, and to suppress the vibration and noise between the housing 1 side and the case 19 side described above, thereby making it easier for the painter to work for a long time. Fatigue can be reduced and the operability of the spray device can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the main part of a conventional device, and FIG. 2 is a sectional view of the main part of the proposed device. 1...Housing, 2...Solenoid coil, 3...Amateur, 6...Cylinder, 7...Body, 9... ... Piston, 10 ... Spring, 12 ... Container, 13
...Intake port, 15...Valve cone,
16°26... Spring, 18...
Suction pipe, 22...Communication hole, 24...Engagement cylinder, 24A...d4L, 24B...
Insertion hole, 25...Pulp.

Claims (1)

[Scope of utility model registration request] An electromagnetic device is formed by arranging an armature in a solenoid coil housed in a housing, and the armature enables amplitude movement using its upper part as a fulcrum.The main body in which the cylinder is embedded is fixed to the cylinder, and the A piston is inserted into the cylinder from the rear and supported, and a spring is elastically supported between the main body and the piston, and the piston is moved into the cylinder through the elastic action of the spring by the amplitude motion of the armature forming the electromagnetic device. The piston is moved reciprocatingly, and liquid paint is sucked into the cylinder by the above movement of the piston, and the liquid paint is discharged and sprayed outside the cylinder. A pulp cone is formed that performs a resilient valve action, an inlet is formed at the bottom of the cylinder that communicates with the container in which the paint is stored, and a communication hole is formed on the housing side continuous with the inlet. Then, a small hole is formed at the bottom side of the communicating hole, and the engaging cylinder has a large-diameter insertion hole formed at the bottom side of the small hole, which is fixed to the cylinder. A valve is formed in the small hole of the engagement tube to elastically act as a valve from the cylinder side via a spring, and the liquid from the container is inserted into the insertion hole of the engagement tube. A pump device for an airless sprayer, characterized in that a suction pipe for sucking up paint is inserted and formed.