JP2002061566A - Force feed variable displacement air pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a force feed variable displacement air pump capable of lowering the production cost and solving a problem on a storing place by increasing the number of components used in common, and preparing various kind of displacements and strokes only for a cylinder block side components directly relating to the performance of the air pump. SOLUTION: A cylinder block 25 mounted on a cylinder piston or the like and a switching valve block 50 provided with a selector valve are manufactured as independent components, and assembled in a state that an axial direction of the air cylinder 25a and an axial direction of a spool 54 of the selector valve block are perpendicular to each other, holes 25d, 25e, 25f and 25g for feeding and discharging the air with respect to the air cylinder are formed on a side face at the selector valve block side, air feeding and discharging holes 52b, 52d, 52e and 52f of the selector valve are formed on aside face at a selector valve block side, and a piping plate 40 provided with a channel 40a for connecting plural feeding and discharging holes of the cylinder block and plural feeding and discharging holes of the cylinder block in a predetermined matter, is mounted between the cylinder block 25 and the selector valve block 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable-feed-volume air pump used as a fluid material discharge device for discharging a fluid material containing a high-viscosity material such as a liquid or an adhesive. Air is alternately supplied and exhausted through a switching valve built in the spool storage chamber to the left and right air chambers separated by the piston arranged in the cylinder, and the piston is reciprocated to be fixed to the piston. The present invention relates to a variable-pump-volume air pump that pumps a fluid to be pumped by reciprocating a rod that is connected to a nozzle connected to an air cylinder.

[0002]

2. Description of the Related Art As an apparatus for extruding a high-viscosity fluid material such as an adhesive, there is a high-viscosity material extruding apparatus described in Japanese Utility Model Application Laid-Open No. 2-31997. However, when this is actually used, the glue can be extruded, but since the piston after being extruded is returned by a spring, the friction between the piston and the cylinder has increased and the return speed of the piston has been slowed down . Also, when the force of the spring was increased, the injection force of the adhesive was weak this time, and it was not practical. Further, there is a problem that the structure is complicated and the disassembly and cleaning is difficult.

[0003] The applicant of the present invention has proposed that the opening and closing operation of an on-off valve for stopping the supply of air causes the air to be alternately fed into left and right air chambers provided on both sides of the piston via a switching valve, thereby causing the piston to move. Developed a compact portable high-viscosity discharge device with a reciprocating structure. It is a device that can discharge even high-viscosity materials such as adhesives. It is small and does not require on-site pump filling work. A patent application has been filed to provide an inexpensive apparatus that can improve the performance and is simple in structure and easy to disassemble and clean (Japanese Patent Application Laid-Open No. H11-325391). However, providing a pipe for operating the opening / closing valve to supply and exhaust air into the air cylinder via the switching valve inside the apparatus makes the piping structure somewhat complicated. This piping structure has a simple structure, and a fluid material discharging apparatus capable of discharging not only a high-viscosity material such as an adhesive but also a fluid material including a liquid has been proposed (JP-A-2000-55295).
issue).

In this fluid material discharge device, air is alternately supplied and exhausted to left and right air chambers separated by a piston disposed in an air cylinder through a switching valve to reciprocate the piston and stop the piston. The rod that is attached reciprocates in the nozzle connected to the air cylinder to suck the fluid material contained in the cartridge attached in the middle of the nozzle into the nozzle, and then discharges it. I have. A hole for supplying and discharging air into the air cylinder is formed on one of the left and right sides of the air cylinder, and a predetermined hole for alternately supplying and discharging air to the left and right air chambers in the air cylinder. Attach the plate with the groove in place to the side of the cylinder. Then, the piston is driven by supplying and exhausting gas through a flow passage arranged so as to constitute a desired piping structure formed by the groove and the side surface of the air cylinder.

[0005]

However, when an air pump of this type is mounted on various devices and used, if the volume of the air cylinder is constant, "too much force" or " The power is too small. " Therefore, it is necessary to change the diameter or stroke of the air cylinder, but if it is desired to produce various cylinder diameters and strokes depending on the demand, the conventional equipment and design cannot be used as it is, resulting in high cost. Had. In addition, the produced air pump also had to stock various things, and there was a problem that a vast storage space was required. The present invention solves the above-mentioned problems of the prior art, increases the number of parts that can be used in common, increases the number of parts that can be used in common, and prepares only cylinder block sides with various volumes and strokes that are directly connected to the performance of the air pump. An object of the present invention is to provide a variable-pump-volume air pump that reduces costs and solves the problem of storage space.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and has a spool housed in a spool chamber in left and right air chambers separated by a piston arranged in an air cylinder. A pumping device that alternately supplies and exhausts air through a switching valve to reciprocate a piston, and that a rod fixed to the piston reciprocates in a nozzle connected to an air cylinder to pump a fluid to be pumped. In a variable displacement air pump, a cylinder block provided with a cylinder / piston and the like and a switching valve block provided with a switching valve are manufactured as separate parts, and when they are assembled, the axial direction of the air cylinder of the cylinder block and the switching valve block are used. The spool is arranged so that it faces in a direction perpendicular to the axial direction of the spool, and a plurality of holes for supplying and discharging air into the air cylinder are provided. In addition to drilling holes on the side of the air cylinder on which the switching valve block is mounted, holes are provided on the side of the switching valve block on which the cylinder block is mounted for supplying and discharging air to and from the spool storage chamber of the switching valve. A pipe plate having a flow path formed so that the plurality of supply / discharge holes of the cylinder block and the plurality of supply / discharge holes of the cylinder block make a predetermined connection is disposed between the cylinder block and the switching valve block. The present invention also provides a variable-pump-volume air pump characterized in that a piston is driven by supplying and exhausting air through a flow path of a piping plate.

A cylinder block and a switching valve block provided with a switching valve are manufactured as separate parts. On the cylinder block side, various cylinder diameters and strokes are manufactured according to demand, and the switching valve block and / or
Alternatively, the piping plate side is mass-produced as a common part to reduce costs. In addition, models from large models to small models can be easily expanded, and the lineup becomes easy. Further, since the number of common parts increases, the number of parts can be reduced at once, but there is an effect that it is not so difficult to increase the number of types.

According to a second aspect of the present invention, in the pressure-feeding variable volume air pump according to the first aspect, the plurality of supply / discharge holes of the cylinder block and the plurality of supply / discharge holes of the cylinder block are respectively provided with an air input. Except for the holes and the air discharge holes, four are provided, so that the switching valve block is provided between the two supply discharge holes located on the center side of the cylinder block and the two supply discharge holes located outside. It is characterized in that it is arranged in a direction orthogonal to any position between the four or the four supply and discharge holes. It is arranged and assembled so that the axial direction of the air cylinder of the cylinder block and the axial direction of the spool of the switching valve block are orthogonal to each other, so that the arrangement between them can be varied, and the appropriate position can be selected according to the application it can. This greatly increases the acceptability of the design.

According to a third aspect of the present invention, in the air pump of the first or second aspect, the rod fixed to the piston reciprocates in a nozzle connected to the air cylinder. Thus, the present invention is characterized in that a fluid material contained in a detachable cartridge attached in the middle of the nozzle is sucked into the nozzle, and then used as a fluid material discharge device that discharges the material under pressure.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a variable displacement air pump according to the present invention. FIG. 1 is an exploded perspective view of one embodiment of a variable-pump-volume air pump according to the present invention. The illustrated variable-pump-volume air pump 1 schematically includes an upper assembly 30 including a cylinder block 25, a piping plate 40, and a lower assembly 60 including a switching valve block 50. ing. The feature of the present invention is that the cylinder block 25 and the piping plate 40 side are variously prepared according to the change of the discharge volume.
Parts other than the cylinder block 25 and the lower assembly 60
In principle, it is sufficient to prepare only one type as a common part. This has the advantage that the number of parts can be reduced and that the upper assembly 30, especially the cylinder block 25, can be replaced with an arbitrary discharge volume.

The upper assembly 30 includes a nozzle 10, a cartridge 15, a piston 20, a rod 23, and an air cylinder block 25 as shown. The nozzle 10 has a hollow pipe shape with a cylinder inside so that a fluid material including a high-viscosity material such as an adhesive can be discharged from the tip. The end opposite to the tip is detachably connected to the cylinder block 25. The connection between the nozzle 10 and the cylinder block 25 can be made by screw engagement. Alternatively, the connection can be made by providing a J-groove and a projection at the connecting portion between the nozzle 10 and the cylinder block 25 and engaging them. A rod 23 fixed to the piston 20 is inserted inside the nozzle 10 so as to be able to reciprocate on the inner wall of the nozzle 10. At the lower part of the nozzle 10, a mounting portion 10a for mounting a cartridge 15 containing a fluid material is provided.
a is provided with a suction port 10b for sucking the fluid material into the rod 23. In the middle of the tip of the nozzle 10, the check valve is closed when the flowable material is sucked into the nozzle 10 to prevent air from entering from the tip of the nozzle 10, and is opened when discharging the flowable material. 12 are attached. The suction port 10b is provided with a suction valve 13 that opens so that the fluid material is sucked into the nozzle 10 only when the rod 23 moves away from the tip of the nozzle 10, and is closed when the fluid material is discharged. I have.

The peripheral wall of the cartridge 15 is in the most extended state when the fluid material is fully stored, and has a bellows shape that gradually contracts as the fluid material is discharged. Thereby, the cartridge 15
It is possible to continuously supply the flowable material into the nozzle 10 without creating a space inside the nozzle. The cartridge 15 is configured such that the upper end of the cartridge 15 is
Used in conjunction with b. Note that the cartridge 15 is provided with a structure in which a protruding portion 15a for engaging with the mounting portion 10a is housed in a protective container provided on an upper side surface and is not accidentally detached.

The piston 20 is fitted and mounted in a cylinder block 25, and a piston recess 2 is provided around the piston 20.
0a, and is roughly shaped like a "thread wound". A rod 23 is fixed to the piston 20 so as to be inserted into the nozzle 10 via a guide 27. When the piston 20 reciprocates, the rod 2
3 slides back and forth inside the nozzle 10. Here, Guide 2
7 shows a rod 23 fixed to the piston 20 and the nozzle 1
It is provided to guide the nozzle 10 so as to accurately contact the inner wall of the nozzle 10 when the nozzle 10 reciprocates.

The inside of the cylinder block 25 has a cylindrical cylinder chamber 25a. Cylinder block 25
The air supply / discharge ports 25d and 25e are formed in the lower surface of the air supply port at positions connected to the left and right air chambers 25b and 25c formed by the ends of the piston 20. Also, the left and right air chambers 25b, 25c formed by being partitioned by the ends of the piston 20 only when the piston 20 abuts on one of the left and right end surfaces in the cylinder chamber 25a.
In other cases, switching supply / discharge ports 25f and 25g are provided at positions where the connection / discharge ports 25f and 25g are connected to a side space formed by the inner wall of the cylinder block 25 and the piston recess 20a. Further, a discharge port 25h is formed at a position that is always connected to a side space formed by the cylinder block 25 and the piston recess 20a.

The switching valve block 50 formed in the lower assembly 60 is installed below the cylinder block 25 via the piping plate 40. A spool 54 that reciprocates in the same direction as the reciprocating direction of the piston 20 in the case 52 is provided therein. The outer side surface of the case 52 on the same side as the outer side surface on which the air supply / discharge ports 25d, 25e and the like are formed in the cylinder block 25 is located at a position connected to the left and right air chambers formed by the ends of the spool 54. Switching ports 52d and 52e are respectively formed. Also,
Only when the spool 54 contacts one of the left and right end surfaces in the case 52, the spool 54 is connected to the left and right air chambers formed by the ends of the spool 54. Otherwise, the inner wall of the case 52 and the spool recess are formed. Supply / discharge ports 52f, 52 at positions connected to the side space formed by
g is drilled. Further, an air supply port 52a is connected to the opening / closing valve 26 at a position that is always connected to a side space formed by the case 52 and the spool recess 54a. An elastic material such as rubber is attached to a portion of the end surface of the spool 54 which comes into contact with the case 52. This is to prevent the spool 54 from cracking due to impact when colliding with the case 52 and to reduce noise.

The opening / closing valve 26 is provided at a lower portion of the switching valve block 50 and a trigger 28 disposed at an upper portion of the grip 28 is provided.
a. In a normal state, the open / close valve 26 is closed by a spring provided therein.
No compressed air is supplied. Trigger 28 against spring force
When a is pulled by a finger, the opening / closing valve 26 is opened, and compressed air is supplied from the air supply port 52a through the switching valve block 50 into the cylinder chamber 25a. The air supply port 52a is connected to the air supply pipe 29 via the opening / closing valve 26, and compressed air is supplied to the air supply pipe 29 by a pump (not shown).

Next, the operation will be described. First,
The cartridge 15 containing the adhesive is attached to the mounting portion 10a of the nozzle 10, and the air supply pipe 29 and a pump (not shown) are connected by piping. When the trigger 28a is pulled with a finger, the open / close valve 26 is opened, and compressed air is sent from the air supply port 52a into the switching valve block 50. The sent compressed air passes through a spool recess 54 a around the spool 54, passes through a supply / discharge port 52 f provided in the switching valve block 50, and passes through the air provided in the cylinder block 25, as shown in FIG. The air is sent to the supply / discharge port 25d, and fills the left air chamber 25b formed by the cylinder block 25 and the end of the piston 20. This pressure causes the piston 20 to move to the right. When the piston 20 abuts on the right end of the cylinder block 25, the switching supply / discharge port 25f communicates with the switching port 52d, and air flows into the switching valve block 50 through this. With this pressure, the spool 54 is moved rightward of the case 52 (FIG. 3B). When the spool 54 moves to the right side, the air existing in the space formed on the right side of the spool 54
Through the switching supply / discharge port 25g to the discharge port 25h through a side space formed by the cylinder block 25 and the piston recess 20a of the piston 20 (FIG. 3).
(C)), is discharged outside. Accordingly, noise generated when the spool 54 and the piston 20 disposed inside the switching valve block 50 reciprocate is reduced.

When the spool 54 comes into contact with the right end of the case 52, the compressed air supplied from the air supply port 52a passes through the spool recess 54a, passes through the supply / discharge port 52g provided in the switching valve block 50, and then enters the cylinder. The air is supplied to an air supply / discharge port 25 e provided in the block 25. Then, the right air chamber 25c formed by the cylinder block 25 and the end of the piston 20 is filled. This pressure causes the piston 20 to move to the left. The air existing in the left space 25b formed on the left side of the piston 20 by the movement of the piston 20 passes through the switching port 52d from the supply / discharge port 25d via the space 52c on the left side of the spool 54, and passes through the switching port 52d.
After entering the cylinder block 25 through 5f. Further, the air is sent to the outlet 25h through a side space formed by the piston recess 20a of the piston 20. Then, the fluid is discharged from a port formed at an arbitrary position of the cylinder block 25 to the outside.

When the piston 20 contacts the left end of the cylinder block 25, the switching supply / discharge port 25g communicates with the switching port 52e. As described above, when the spool 54 is at the left end of the case 52, the piston 20 is pressed rightward, so that the air in the air chamber 25c is released from the switching valve block 50.
And the spool 54 is moved to the left of the case 52. The movement of the spool 54 causes the spool 54 to move.
The air existing in the left space 52c of the
, A side space 20a formed by the cylinder block 25 and the piston recess 20a via the switching supply / discharge port 25f.
Through the outlet 25h. The compressed air input from the air supply port 52a is
Through the supply / discharge port 52f provided in the switching valve block 50
Is sent to the air supply / discharge port 25d provided on the side surface of the cylinder block 25, and the piston 20 moves to the right by this pressure. (FIG. 6 (e)). Thereafter, this operation is sequentially repeated, and the piston 20 reciprocates.

By the reciprocating motion of the piston 20, the rod 23 fixed to the piston 20 reciprocates inside the nozzle 10. As the rod 23 moves away from the tip of the nozzle 10, the pressure inside the nozzle 10 becomes negative. Thereby, the suction valve 13 is opened, and the fluid material is sucked into the nozzle 10 from the cartridge 15. At this time, the check valve 12 is closed. When the rod 23 moves toward the tip of the nozzle 10,
The check valve 12 is opened by the pressure, and the nozzle 10 is discharged vigorously from the tip of the nozzle 10. At this time, the suction valve 13 is closed. Thereafter, this operation is sequentially repeated.

FIGS. 4A to 4C are plan views of the piping plate 40 for explaining variations in the positional relationship between the cylinder block and the switching valve. The piping plate 40 includes the upper assembly 30 and the lower assembly 6.
It is sandwiched between 0 and serves to seal both, and is made of plastic or other material having sealing properties. When the material is a plastic or other synthetic material, the pipe plate 40 can be easily and quickly mass-produced by injection molding or the like, and cost can be reduced.

In the illustrated preferred embodiment, the upper surface of the piping plate 40 has a shallow surface facing the ports fluidly connected to the air supply ports 25d, 25e and the switching supply ports 25f, 25g on the cylinder block 25 side. Port P1
To P4 are formed. On the other hand, on the lower surface of the pipe plate 40, a port P5 that penetrates the pipe plate 40 and faces ports that are fluidly connected to the switching ports 52f and 52g and the supply and discharge ports 52d and 52e of the switching valve block 50.
To P8 are formed. Ports P1 to P4 and Port P
5 to P8, the positions of which are shifted from each other. In order to correct these positions, a shallow groove is formed on the surface of the piping plate 40 so that a predetermined front side port is fluidly connected to a predetermined rear side port. A channel 40a is formed.

The above-described feature of the present invention, that is, the feature that the upper assembly 30 and the lower assembly 60 can be assembled face to face via the piping plate 40, is that these parts manufactured as separate parts are used as cylinder blocks. This is obtained by arranging the air cylinder chamber 25a so that the axial direction of the air cylinder chamber 25a is perpendicular to the axial direction of the spool 54 of the switching valve block 50.

In the illustrated preferred embodiment, the plurality of supply and discharge holes of the cylinder block 25 and the plurality of supply and discharge holes of the cylinder block are respectively provided with air input holes 52a.
And four air discharge holes except for the air discharge holes 25h. Therefore, as shown in FIGS. 4A to 4C, the switching valve block 50 is provided between the two supply / discharge holes located at the center of the cylinder block 25 (FIG. 4A). Between the two supply / discharge holes located at (Fig. 4 (b)) or 4
It can be arranged in a direction orthogonal to any position outside the one supply / discharge hole (FIG. 4 (c)). Thereby, it is possible to cope with a variety of designs.

[0025]

According to the present invention, air is alternately supplied to and exhausted from the left and right air chambers separated by the pistons disposed in the air cylinders via the switching valve built in the spool storage chamber. In a variable displacement volume type air pump for pumping a fluid to be pumped by reciprocating a piston and a rod fixed to the piston reciprocating in a nozzle connected to an air cylinder, a cylinder, a piston and the like are provided. Manufacture the cylinder block and the switching valve block provided with the switching valve as separate parts, and assemble them so that the axial direction of the air cylinder of the cylinder block and the axial direction of the spool of the switching valve block are orthogonal to each other. Arrange multiple holes for supplying and discharging air into the air cylinder on the side where the switching valve block of the air cylinder is mounted. And a plurality of holes for supplying and discharging air into the spool storage chamber of the switching valve are formed in the side of the switching valve block on the side where the cylinder block is mounted, and a plurality of cylinder block supply holes are provided. A pipe plate having a flow path formed so as to make a predetermined connection between the discharge hole and the plurality of supply / discharge holes of the cylinder block is disposed between the cylinder block and the switching valve block, and air is passed through the flow path of the pipe plate. Because the piston is driven by supplying and exhausting, the cylinder block side manufactures various cylinder diameters and strokes according to demand, and the switching valve block and / or piping plate side as common parts. It has the effect of mass production and cost reduction.

In addition, the models can be easily expanded from large models to small models, and the lineup becomes easy. Further, since the number of common parts increases, the number of parts can be reduced at once, but there is an effect that it is not so difficult to increase the number of types.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of one embodiment in which a variable-feed-volume air pump according to the present invention is used as a fluid material discharging device.

FIG. 2 is a front view in which a main part of the fluid material discharging apparatus of FIG. 1 is sectioned;

3 (a) to 3 (e) are cross-sectional views for explaining an operational relationship between a piston and a spool in the fluid material discharging device of FIG. 1;

FIGS. 4A to 4C are plan views for describing variations in the positional relationship between the cylinder block and the switching valve. DESCRIPTION OF SYMBOLS 1 Fluid material discharge device 10 Nozzle, 10a Attachment part 10b Suction port 12 Check valve 13 Suction valve, 15 Cartridge 15a Projection part, 20 Piston 20a Depression, 23 Rod 25 Cylinder block 25a Cylinder chamber 30 25b, 25c Air chamber 25d, 25e Air supply / discharge port 25f, 25g Switching supply / discharge port 25h Discharge port 27 Guide 30 Upper assembly 40 Piping plate 50 Switching valve block 52 Case 52a Air supply port 52d, 52e Switching port 52f, 52g Supply / discharge port 54 Spool 60 Lower set Three-dimensional

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H071 AA01 BB01 BB05 CC17 CC31 CC32 CC34 DD72 DD74 DD89 3H075 AA17 BB03 BB12 BB21 CC30 CC32 CC33 CC35 CC36 DB10 DB39 DB44 DB45 DB48

Claims (3)

[Claims] An air supply and an air supply are alternately supplied and exhausted to a left and right air chambers separated by a piston disposed in an air cylinder through a switching valve built in the spool storage chamber to reciprocate the piston. A pump block having a cylinder / piston, etc., and a switching valve in a variable displacement air pump for pumping a fluid to be pumped by reciprocating a rod fixed to the piston in a nozzle connected to an air cylinder. The switching valve block provided with is provided as a separate part, and when they are assembled, they are arranged so that the axial direction of the air cylinder of the cylinder block and the axial direction of the spool of the switching valve block are orthogonal to each other. When a plurality of holes for supplying and discharging air into the inside are drilled on the side of the air cylinder on the side where the switching valve block is mounted To, drilled a plurality of holes for supplying and discharging air to the spool housing chamber of the switching valve to the side of the side of attaching the cylinder block of the switching valve block,
Then, a pipe plate having a flow path formed such that the plurality of supply / discharge holes of the cylinder block and the plurality of supply / discharge holes of the cylinder block make a predetermined connection is disposed between the cylinder block and the switching valve block, A variable displacement pump air pump characterized in that a piston is driven by supplying and exhausting air through a flow path of a piping plate. 2. The variable displacement air pump according to claim 1, wherein the plurality of supply / discharge holes of the cylinder block and the plurality of supply / discharge holes of the cylinder block are respectively formed by:
Except for the air input hole and the air discharge hole, four are provided, and the switching valve block is provided between two supply / discharge holes located on the center side of the cylinder block and between two supply / discharge holes located outside. Alternatively, the variable-pump-volume air pump is disposed in a direction orthogonal to any position outside the four supply / discharge holes. 3. The variable displacement air pump according to claim 1, wherein the rod fixed to the piston reciprocates in a nozzle connected to the air cylinder, thereby being attached to the middle of the nozzle. A variable-feed-volume air pump, wherein the air pump is used as a fluid material discharging device that sucks fluid material contained in a detachable cartridge into a nozzle and then discharges the material under pressure.