JPH04101080A - Diaphragm pump device - Google Patents

Abstract

PURPOSE:To prevent a diaphragm from being reversed so as to heighten the smoothness of operation in a device provided with two pump bodies having diaphragms by dividing the pump shaft of one pump body into two, and constantly applying pressure air of equal pressure to each chamber of this pump body. CONSTITUTION:This diaphragm pump device 1 is provided with a first pump body 2 with diaphragms 6 fitted to both ends of a pump shaft 7, a second pump body 3 with diaphragms 13 fitted to the respective one ends of a pair of pump shaft pieces 14a, 14b, and a connecting means 19 for connecting the pump shaft 7 to the pump shaft pieces 14a, 14b. In the second pump body 3 operated subordinately being interlocked with the pump shaft 7, the outer ends of a lower and an upper vertical holes 46, 47 communicate with a pump chamber 18 are communicated with through holes 48, 49. An air applying hole 50 communicated with an air chamber 17 is formed at a case 12. This air applying hole 50 is connected to high pressure air source X, and pressure air of equal pressure is constantly applied to each air chamber 17, so that the diaphragm 13 is always curved in one direction and thereby prevented from being reversed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a diaphragm pump device that can smoothly operate two pump bodies using diaphragms at an accurate stroke ratio.

[Conventional technology]

For example, 2, which is cured by mixing the main agent and the auxiliary
When using liquid temperature mixing type coatings, etc., due to constraints such as curing time, it is required to mix the two coatings in a stable and accurate ratio and quickly in accordance with the amount used.

Therefore, in Japanese Unexamined Patent Publication No. 63-205468, the present applicant has proposed that the pump shafts a of two diaphragm pumps, whose pump shafts a are opposed to each other in parallel, are connected as shown in FIG. 9(a). each pump shaft a
They devised a diaphragm pump device that could reciprocate in conjunction with each other, and proposed connecting the device to a stirrer.

In addition, the present applicant has partially disclosed a lever-shaped member that swings around a fulcrum K as a connecting means, and the fulcrum is configured to be repositionable in its length direction. . As a result, each pump shaft aSa can freely change its moving stroke ratio according to the fulcrum position, and the paint can be continuously supplied from each pump body at an appropriate ratio.

[Problem to be solved by the invention]

However, when operating such a pump device,
In addition to lowering the smoothness of operation due to looseness at the joint between each pump shaft a and the connecting means and the fulcrum K of the connecting means, the amount of paint supplied from each pump body is also lower than that of the pump shaft a. It was found that it changes unstablely with each stroke. This means that each pump shaft a is driven by both the acting force of the working fluid supplied and discharged into the working chamber of each pump body and the acting force received from the other pump shaft a via the connecting means, and each This is thought to be due to the fact that the acting force deviates in time due to the play. That is, each pump shaft a moves extra and independently in advance of the connecting means while the backlash is sucked by the working fluid, and this extra independent movement causes the stroke ratio to change unstablely. .

Therefore, the present inventor proposed eliminating the supply and discharge of working fluid to one of the pump bodies, and operating the one pump body dependently only by the connecting means. However, when such a configuration is adopted, as shown in Figure 9), when the paint is poured into the pump chamber d, the diaphragm e that protrudes outward due to the negative pressure in the pump chamber d is caused to flow. - When the diaphragm e is small, the diaphragm e becomes concave and convex with every stroke, such as being concave due to pressurization.

As a result, new problems that need to be solved arise, such as further impairing the smoothness of operation, deteriorating the working environment by inducing abnormal vibrations that cause noise in the device, and shortening the life of the device.

The present invention is based on dividing the pump shaft of one pump body into two pump shaft pieces, and constantly applying pressurized air of equal pressure to each air chamber of the one pump body, and inverting the diaphragm. The object of the present invention is to provide a diaphragm pump device that can prevent such problems, improve smoothness of operation, stabilize stroke ratio, and improve coating material supply accuracy.

[Means to solve the problem]

In order to achieve the above object, the diaphragm pump device of the present invention includes a pair of case bodies each having a cavity therein and a hole communicating with the cavity, spaced apart from each other, and with the holes facing inward to each other. a diaphragm that divides each of the cavities into an inner working chamber and an outer pump chamber; a pump shaft that fixes the diaphragm at both ends and is inserted through the hole with the shaft sealed; and conducts to the pump chamber. The valve body includes a check valve that allows fluid to freely flow into the pump chamber, and a check valve that allows fluid to freely flow out from the pump chamber, and is configured to supply and discharge working fluid to and from each of the working chambers. a first pump body provided with an operating hole for reciprocating the pump shaft by alternately supplying and discharging the working fluid, and a pair of case bodies each having a cavity therein and a hole communicating with the cavity. a diaphragm that divides each of the spaces into an inner air chamber and an outer pump chamber, and each diaphragm of the pair of case bodies is fixed at one end. and a pair of pump shaft pieces whose shafts are sealed and inserted through the hole, and whose other ends face each other, a check valve which communicates with the pump chamber and allows fluid to freely flow into the pump chamber, and a fluid from the pump chamber. A second pump body is provided with a valve body consisting of a check valve that allows free outflow of air, and a second pump body is provided with an application air hole that constantly applies pressurized air at the same pressure to each of the air chambers. Each other end of the pump shaft piece is coupled to the other end of a lever-shaped coupling means that engages with the pump shaft and swings about a fulcrum together with the reciprocating movement of the pump shaft.

Further, the fulcrum of the connecting means may be provided on a movable metal fitting whose position is changed in the length direction of the connecting means.

[For production]

The second pump body of the diaphragm pump device configured in this manner fixes the diaphragm in each case body to one end of a pair of pump shaft pieces, the other ends of which face each other, and the air chamber partitioned by the diaphragm is configured to Pressurized air of equal pressure is constantly applied through the air holes.

Therefore, the second pump body can be operated in a dependent manner in conjunction with the pump shaft of the first pump body only by the acting force received from the connecting means, and the constant pressurization can prevent the diaphragm from reversing, thereby preventing vibrations. , operation can be performed smoothly without causing noise or the like.

In addition, each pump shaft piece absorbs play between it and the connecting means by the constant outward biasing force exerted by the pressurized air, so that the stroke ratio between it and the pump shaft can be maintained accurately and constant. This makes it possible to maintain a stable coating material supply amount.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

In the figure, the diaphragm pump device 1 has a first pump body 2 with diaphragms 6 attached to both ends of a pump shaft 7, and a diaphragm 13 attached to each end of a pair of pump shaft pieces 14a and 14b, the other ends of which are opposite to each other. It includes a second pump body 3 and a connecting means 19 that connects the pump shaft 7 and the pump shaft pieces 14a, 14b.

Further, the first pump body 2 and the second pump body 3 have substantially the same configuration, and in this example, the first pump body 2 has a pair of case bodies 5a, respectively, as shown in FIG. , 5b, a diaphragm 6, a pump shaft 7, and a valve body 8, and is disposed between upper and lower frame plates 20, 21 with the pump shaft 7 directed horizontally.

The case 5 is formed of a pair of case bodies 5a and 5b, each consisting of an outer case piece 22 and an inner case piece 23 attached to the inner side of the outer case piece 22. are arranged facing inward from each other and spaced apart from each other.

The outer case piece 22 has a recess 25 on its inner surface.
A flange portion 26 is provided around the periphery, and the upper and lower ends of the flange portion 26 are bolted to the upper frame plate 20 and the lower frame plate 21.

The inner case piece 23 is bolted to the outer case piece 22 through a peripheral flange 27, and is provided with a recess 28 on its outer surface, that is, the surface facing the outer case piece 22.
Each case body 5a, 5b forms within it a dense cavity H1 consisting of recesses 25, 28, respectively. In addition, the inner case piece 23 has a hole 9 in its center that penetrates the recess 28.
The case bodies 5a and 5b are arranged with the holes 9.9 facing the same side and facing each other.

Further, the case bodies 5a and 5b are mounted with a diaphragm 6 sandwiched between the outer case piece 22 and the inner case piece 23, respectively, so that the diaphragm 6 divides the space H1 into an inner working chamber 10 and an outer pump chamber 11. In addition to classifying into
Each diaphragm 6 is connected to an end of a pump shaft 7.

The pump shaft 7 is a long shaft inserted through the hole 9.9, and the diaphragm 6 is fixed between collar plates 30.31 which are tightened using nuts screwed into both ends of the pump shaft 7. Further, the pump shaft 7 is slidably held by being inserted into the hole 9, and is sealed by a sealing material provided around the hole 9.

The outer case piece 22 has check valves 8A attached to the lower vertical hole 32 and upper vertical hole 33 communicating with the pump chamber 11, respectively, to allow the paint to freely flow into the pump chamber 11. , a check valve 8 that allows the paint to freely flow out from inside the pump chamber 11
A valve body 8 made of B is arranged. The outer ends of the father vertical hole 33 and the lower vertical hole 32 are communicated with through holes 35 and 36 provided in the upper frame plate 20 and the lower frame plate 21, respectively, so that water flows through the through holes 36. The paint is distributed by the lower vertical holes 32, 32 into each pump chamber 11.32 provided in the case body 5a, 5b.
11, and pass through the upper vertical holes 33 and 33 to merge at the through hole 35.

Further, the case 5 is provided with small-diameter operating holes 37a, 37b communicating with the respective operating chambers 10 in the inner case pieces 23, 23, and one end of the operating holes 37a, 37b is attached to the upper frame plate 20, for example. It communicates with the switching valve V.

As shown in FIG. 8, the switching valve V has a boat 01.02 for communicating with a high-pressure air source X that pumps a working fluid such as high-pressure air into which the working fluid flows, and a boat 01.02 for discharging the working fluid. It is equipped with boats R1 and R2 for exhaust, a boat Q for pilot air outflow, and boats P1 and R2 for viroft air inflow, and the boat 01.02 is connected to the operating holes 37a and 37b.
conducts to. Boats R1 and R2 are also connected to a silencer 38. The switching valve V slides the spool valve in one direction when high-pressure pilot air, which is constantly applied from the bow) Q, flows into the boat P1 and returns to the boat P1.
01, and the boat 02 and the boat R2 are electrically connected to each other internally.

Also, the inflow of pilot air into boat P2 causes the spool valve to slide to the other side, internally communicating between boat I and boat 02, and between boat 01 and boat R1.

Therefore, the I-th pump body 2 is the pilot air boat P
By flowing into the boat I, the working fluid can be supplied to the working chamber 10 provided in the case body 5a through the boat I, boat 01 and the working hole 37a, and the supplied working fluid pushes the diaphragm 6, so that the pump shaft 7 can be moved to the case body 5a side. In such a case, the working chamber 10 provided in the case body 5b
The air inside is discharged to the outside air through the operating hole 37b1, boat 02, boat R2, and muffler 38. Furthermore, the pump shaft 7 can be moved toward the case body 5b by the pilot air flowing into the boat P2. Therefore, the working holes 37a, 37b can reciprocate the pump shaft 7 by supplying and discharging the working fluid, and due to the alternating volume change of each pump chamber 11, 11 due to the reciprocating movement, one of the first pump bodies 2 is moved through the through hole. The fluid flowing in from 36 can be continuously discharged from through hole 35 .

The first pump body 2 detects the end position of the reciprocating movement of the pump shaft 7 and supplies the pilot air boat P1,
A controller 39 is attached that alternately switches on and off R2.

The controller 39 controls the pump shaft 7 as shown in FIG.
A pair of abutting plates 41 are attached to the upper frame plate 20 via, for example, H-shaped fittings 40, and the pump shaft 7 is attached to the upper frame plate 20, for example.
The contact plate 41 is attached via a holding base 42 parallel to the
a pair of switch valves 31 that detect the end position and cut off the pilot air flow path by coming into contact with the switch valves 31;
, S2.

The second pump body 3, which operates in conjunction with and subordinate to the pump shaft 7 of the first pump body 2, is as shown in FIG.
It includes a case 12, a diaphragm 13, a pair of pump shaft pieces 14a and 14b, and a valve body 15.

In this example, the case 12 is formed from a pair of hollow case bodies 12a and 12b formed by joining inner and outer case pieces 43 and 44, as shown in FIG. 4, like the case 5. In the internal space H2 of 12a and 12b, the space H
A diaphragm 13 is attached which divides the air chamber 2 into an inner air chamber 17 and an outer pump chamber 18.

Further, in each case body 12a, 12b, hole portions 16 communicating with the air chamber 17 are brought into contact with each other, facing each other, and the diaphragm 13 is fixed to each hole portion 16 with -i, while the other ends are connected to each other. A pair of pump shaft pieces 14a, 14b facing each other with a gap are inserted into the hole 16 so as to be slidably sealed.

In this example, each case body 12a, 12b is formed to have a small diameter and a low volume compared to the case body 5a, 5b, and the pump shaft pieces 14a, 14b arranged in a straight line with an interval are connected to the pump shaft. 7 and its lower end is fixed to the lower frame plate 21.

Note that the upper end is integrally joined by a frame member 45 below the upper frame plate 20 to increase its rigidity.

In addition, the outer case piece 44 has a lower portion communicating with the pump chamber 18;
A valve body 15 consisting of a check valve 15A that allows the paint to freely flow in and a check valve 15B that allows the paint to flow freely is arranged in the upper vertical holes 46 and 47, respectively.

The outer ends of the father vertical hole 47 and the lower vertical hole 46 are connected to the frame material 45.
The case 12 has an air supply hole 50 formed in each inner case piece 43 and communicating with the air chamber 17.

As shown in FIG. 8, the applying air holes 50 are each connected to the high pressure air source X, and by constantly applying pressurized air at the same pressure to each air chamber 17, the diaphragm'', 3 is While always bending in one direction to prevent its reversal, each pump shaft piece 14a, 14b is urged outward.

Then, the pump shaft 7 of the first pump body 2 and the second pump body 2 are connected to each other.
As shown in FIGS. 5 and 6, the connecting means 19 for connecting the pump shaft pieces 14a and 14b of the pump body 3 is a screw arranged in a direction perpendicular to the pump shaft 7 and the pump shaft pieces 14a and 14b. A shaft 55, a movable fitting 56 screwed onto the threaded shaft 55, and one end of which engages with the pump shaft 7, swing around a fulcrum K on the movable fitting 56 along with the reciprocating movement of the pump shaft 7. On the other hand, the other end is provided with a lever-shaped connecting fitting 57 that is connected to the pump shaft pieces 14a, 14b.

The screw shaft 55 has a straight shaft shape and is pivotally mounted to the front and rear vertical pieces 72 and 73 rising from the lower frame plate 21 so as not to be able to move back and forth, so that it can be rotated in a direction perpendicular to the pump shaft 7, etc. Supported in a reversible manner. Further, the screw shaft 55 is connected to the front upright piece 72.
It has a threaded portion 55A in the central portion located between 73, and a handle 58 is provided at the distal end portion protruding forward from the front upright piece 72, which allows the threaded shaft 55 to be rotated forward or backward by manual operation.

The screw shaft 55 is compressed by a stopper 60 screwed onto the front plate 59 disposed on the front surface of the front upright piece 72, and is pressed between the stopper 60 and the screw shaft 5 after setting.
5. Prevent rotation.

Further, the movable fitting 56 has a rectangular block-shaped base body 56A that is threadedly engaged with the screw shaft 55, and the base body 56A is prevented from rotating by a side plate piece 76 connecting between the front upright pieces 72 and 73. You will be guided along the

Therefore, the movable fitting 56 can be moved back and forth according to the rotation of the screw shaft 55, and the base 56A has a bearing piece 75 on its upper surface.
A support shaft 75, which is rotatably inserted into A, is provided protrudingly.

In this example, the amount of movement of the movable fitting 56, that is, the amount of movement of the support shaft 75
An indicator 76 that indicates the amount of repositioning at the fulcrum, which is the axis of the
is attached.

Note that the indicator 76 includes a guide piece 77 having a guide groove 77A extending forward from near the front standing piece 72 and facing upward through the curved part, and a guide piece 77 having one end fixed to the upper surface of the movable fitting 56 and having a guide groove ? and a marking piece 78 inserted through 7A,
The guide piece 77 is fixed to the upper surface of the front plate 59, for example. The indicator piece 78 is made of a flexible elastic material such as a spring steel plate, and the other end is exposed from the guide piece 7, so that the amount of position change can be indicated by a change in the height position of the other end. Note that the guide piece 7 has a scale formed in the exposed portion thereof to quantify the amount of position change.

The connecting fitting 57 also includes a pair of side frame pieces 80 that face parallel to the screw shaft 55 and sandwich the bearing piece 75 as a fulcrum, and joint frame pieces 81 and 82 that connect the vicinity of the front end and the rear end of the side frame pieces 80, respectively. It has an outer frame 85 in the shape of a horizontally long lever. Also outer frame 85
is reinforced by a joint frame piece 83 arranged to be offset to the rear side, and a position 86 surrounded by the joint frame pieces 82 and 83 and the side frame pieces 80 is provided with the pump shaft 7 and the rotating frame piece 83. A support shaft 87 that can be engaged is fixed.

The support shaft 87 has a support shaft portion 87B protruding from the upper end of a block-shaped base 87A that is fitted into the temple 86, which is inserted into the pivot hole 7A formed transparently at the center of the pump shaft 7. The lower end of the base 87A is supported by a bottom plate 89 provided on the lower surface of the outer frame 85.

Therefore, the connecting fitting 57 engages with the pump shaft 7 at one rear end, and the side frame pieces 80 and 80 sandwich the bearing piece 75A, so that the pump shaft 7 moves back and forth about the fulcrum K. It can oscillate.

Further, the connecting fitting 57 is attached to each tip of the side frame piece 80 that projects forward from the front joint frame piece 81, and the pump shaft piece 14a,
Upper and lower protruding pieces 90A and 90B are provided to sandwich the opposite ends of 14b at the upper and lower sides, respectively. Note that the protruding piece portion 90A,
90B is formed by horizontally cutting the side frame piece 80, and in this example, the pump shaft piece 14 is formed as shown in FIG.
Engagement pins 91, 91 that can abut both sides of the projecting pieces 90A, 90B are fitted vertically to the other ends of the pump shafts 14a, 14b, thereby engaging and driving the pump shaft pieces 14a, 14b. Therefore, in this example, the protruding pieces 90A, 90B and the engaging pin 91 form a retaining part 90 that engages with each pump shaft piece 14a, 14b.

Note that the diaphragm pump device 1 includes the upper frame plate 2.
At the same time, a stirrer 93 communicating with the through hole 35.48 is connected to the through hole 36.49, and paint containers 96A and 96B containing paint A and B, respectively, are connected to the through hole 36.49. Further, the agitator 93 has the pump body 2 between the pump body 2 and the agitator 93.
A paint pressure regulator 97 having a pressure regulator that adjusts the pressure of the paint A to a constant pressure, a first three-way valve 63 with one end 63A communicating with the cleaning agent feeder 62, and a first three-way valve 63 with one end 64A communicating with the meter. Two three-way valves 64 are interposed.

Also, between the second pump body 3 on the driven side and the agitator 93, there is a third three-way valve 65 whose one end 65A communicates with the cleaning agent feeder 62, and a fourth valve whose one end 66A communicates with the meter. Three-way valve 6
6, and the first and third three-way valves 63.6
Each of the switching levers 5 and 64 and 66 of the second and fourth three-way valves 64 and 66 are connected to each other by an operating handle 70 so as to be integrally switchable.

Therefore, by combining the operations on the operating handles 69 and 70, in addition to feeding the coating materials A and B from each pump body 2.3 into the stirrer 93, it is also possible to measure the coating materials A and H. With one touch, you can take out the paint from one end 64A, 66A of the paint to the outside of the device, clean the paint flow path from each pump body 2.3 to the stirrer 93, and clean the flow path including the inside of the stirrer 93. can be done.

〔Effect of the invention〕

Since the diaphragm pump device of the present invention is structured like a ridge, it is possible to prevent the diaphragm from reversing, and smooth operation without causing vibrations, noise, etc., and to reduce the stroke ratio of the pump shaft caused by backlash, etc. Fluctuations can be suppressed, the amount of paint supplied can be stabilized, and mixing accuracy can be greatly improved.

[Brief explanation of drawings]

FIG. 1 is a perspective view illustrating an embodiment of the present invention. Fig. 2 is a sectional view showing the first pump body, Fig. 3 is a perspective view showing its controller, Fig. 4 is a sectional view showing the second pump body, and Fig. 5 is a sectional view showing the connecting means. . FIG. 6 is an exploded perspective view thereof, FIG. 7 is a perspective view showing a state in which the connecting fitting and the pump shaft piece are connected, and FIG. 8 is a schematic diagram showing a state in which the first and second pump bodies are connected. FIG. 9 (al to (d+ are schematic diagrams explaining the prior art. 2... First pump body, 3... Second pump body,
5.12...Case, 5a, 5b, 12a, 12b--Case body, 6.13-
...Diaphragm, 7...Pump shaft, 8.15...
・Valve body, 8A, 8B, 15A, 15B...Check valve, 9.16・
... hole, 10 ... working chamber, 11.18 ... pump chamber, 17 ... air chamber, 19 ... connection means,
37... Operating hole, 50... Air application hole, 56...
・Moving gold odor, K...Fulcrum patent applicant: Meiji Kikai Seisakusho Co., Ltd. Representative Patent attorney: Mura Nae
Main Ward 3 Figure 9 (a) ;'59 Figure (b) & Contents of amendment February 9, 1990

Claims (1)

[Scope of Claims] 1. A case in which a pair of case bodies each having a cavity inside and having a hole communicating with the cavity are arranged at a distance from each other with the holes facing inward from each other, each of the cavities a diaphragm that divides the diaphragm into an inner working chamber and an outer pump chamber; a pump shaft that fixes the diaphragm at both ends and that is sealed and inserted through the hole; and a pump shaft that is connected to the pump chamber and allows fluid to flow into the pump chamber. and a check valve that allows fluid to freely flow out from the pump chamber, the valve body being capable of supplying and discharging working fluid to and from each of the working chambers, and having an alternate flow of the working fluid. A first pump body provided with an operating hole that reciprocates the pump shaft by supplying and discharging the pump, and a pair of case bodies each having a cavity inside and a hole communicating with the cavity. a diaphragm that divides each of the cavities into an inner air chamber and an outer pump chamber; each diaphragm of the pair of case bodies is fixed at one end and the hole is shaft-sealed; a pair of pump shaft pieces that are inserted into the pump chamber and whose other ends face each other; a check valve that communicates with the pump chamber and allows fluid to freely flow into the pump chamber; and a check valve that allows fluid to flow freely from the pump chamber. and a second pump body provided with an application air hole for constantly applying pressurized air at the same pressure to each of the air chambers, one end of which engages with the pump shaft. A diaphragm pump device in which each other end of the pump shaft piece is coupled to the other end of a lever-shaped coupling means that swings about a fulcrum with the reciprocating movement of the pump shaft. 2. The diaphragm pump device according to claim 1, wherein the fulcrum of the connecting means is provided on a movable fitting whose position is changed in the length direction of the connecting means.