JPS6032504B2 - reciprocating pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates primarily to a reciprocating pump for an atomizer for electrically or manually dispensing operations.

Previously, this type of reciprocating pump discharged liquid when pushing down the operating shaft, and sucked up liquid when pulling it up, so there were problems such as intermittent discharge and pulsation when operated continuously. Ta. This invention was made in view of the above circumstances, and aims to make the amount of liquid discharged approximately the same by moving the operating pipe forward and backward, thereby reducing pulsation and smoothly performing the spraying operation. It is something.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

Reference numeral 1 in the figure is a container body, and a suitable cap 2 is screwed onto the opening la of the container body 1.

A through hole 2a is bored in the center of the cap 2, and a reciprocating pump housing 3 according to the present invention is attached to the through hole 2a and the opening la in a fluid-tight manner via packings 4 and 5. The housing 3 is formed into a substantially cylindrical shape with a bottom, and has a liquid-tight structure in which a flange portion 3b is formed on the upper green outer periphery of the cylindrical portion 3a in FIG. 1, and is sandwiched between the packings 4 and 5. A groove-shaped air intake groove 3c is formed in a radial direction in a part of the lower surface of the golden part 3b. Further, a through hole 6 is bored in the bottom portion 3d of the housing 3, and a lower check valve 7 is attached to the through hole 6 so as to close it. This lower check valve 7 is formed so that its outlet side fits into the through hole 6 of the housing 3, and a tube attachment hole 8 is formed on its inlet side, and a valve seat 9 for carrying these is perforated. It has a structure in which a ball 10 is layered on a valve seat 9. A tube 11 that almost reaches the bottom (not shown) of the container body 1 is inserted into the tube attachment hole 8 of the lower check valve 7 . On the other hand, the housing 3
A substantially cylindrical cylindrical body 12 made of an elastic material such as synthetic resin is inserted into the inner wall of the cylindrical portion 3a, and in the illustrated example, it is held and fixed between the cap 2 and the bottom 3d of the housing 3. .

This cylindrical body 12 is inserted into the cylindrical part 3a of the housing 3 with a gap, an outer passage 13 is formed in this gap, and an upper cylinder 14 and a lower cylinder 5 are formed in the inner wall part. The cylinder 14 is passed through the outer passage 13 through a through hole 16 drilled near the upper end, and the lower cylinder 5 is passed through the outer passage 13 through a through hole 17 drilled near the lower end. 17 and the lower cylinder 15 are arranged to communicate with the through hole 6 of the housing 3, respectively,
It has a structure in which an upper check valve 18 is provided on the outer wall so as to close the outer passage 13. In the illustrated example, the upper check valve 18 is formed into a generally trumpet shape, and its proximal end edge is fixed to the outer wall surface of the cylindrical body 12, and its green end portion is attached to both the inner wall surface of the cylindrical portion 3a of the housing 3. It is made of an elastic material so as to be in contact with the part with appropriate pressure, and in the illustrated example, it is formed in a structure that allows liquid to flow upward and prevents the reverse flow. Further, a piston body 19 is inserted into the upper and lower cylinders 14 and 15 so as to close them and allow reciprocating (sliding) movement. This piston body 1
A lower end of a pipe-shaped operating pipe 20 is fixed to the upper end of the operating pipe 9, and a through hole 21 communicating with the upper cylinder 14 is bored near the lower end of the operating pipe 20. A discharge port 22 is provided in the discharge port 22, and an inner passage 23 that connects the discharge port 22 and the through hole 21 is formed. The operation pipe 20 is connected to the cap 2.
The O-ring 24 is inserted into the through-hole 2a of the cap 2 and is held liquid-tight by an O-ring 24 attached to the cap 2, and the O-ring 24 is fixed to the cap 2 by a pressing member 25. Note that the pressure receiving areas of the upper cylinder 4 and lower cylinder 15 provided in the cylindrical body 12 are different in size for reasons described later, and consideration is given so that the pressure receiving area of the lower cylinder 14 is at least twice the pressure receiving area of the upper cylinder 15. has been done.

Hereinafter, the operation of the reciprocating pump according to the present invention configured as described above will be explained.

In FIG. 1, the left half shows a state in which the operating pipe 20 is pushed down, and the right half shows a state in which the operating pipe 20 is pulled upward.

When the operation pipe 20 is pulled up from the lowered state as shown on the left side of Fig. 1, the piston body 1 fixed thereto will be removed.
9 moves upward at the same time, the inside of the upper cylinder 14 is pressurized, and the inside of the lower cylinder 15 is depressurized. When the inside of the upper cylinder 14 is pressurized, the liquid in it (in the illustrated example, it is a spray liquid, but since the spray liquid has not risen at the beginning of the operation, it is air, and the same applies hereafter) flows through the through hole 21 and through the inner passage 23. It is discharged from the discharge port 22.

It also tries to flow into the outer passage 13 from the through hole 16, but
Since the upper check valve 18 is closed, this liquid flow does not occur.
On the other hand, liquid attempts to flow from the outer passage 13 through the through hole 17 due to the reduced pressure in the lower cylinder 15, but this liquid flow does not occur because the upper check valve 18 is closed as described above. Further, due to the reduced pressure in the lower cylinder 15, the liquid in the container body 1 is sucked up by the tube 11, pushes up the ball 10 of the lower check valve 7, and flows into the lower cylinder 15 through the gap with the valve seat 9. When the operation pipe 20 is pulled up by a series of these actions, a discharge amount expressed as the product of the pressure receiving area of the upper cylinder 14 and the operation stroke is obtained. Next, when the operation pipe 20 is pushed down from the state shown on the right side in FIG.
The liquid in the lower cylinder 15 tries to flow back into the container body 1 through the lower check valve 7, but the valve seat 9 and ball 10 of the lower check valve 7 come into close contact and prevent the liquid from flowing back into the container body 1. is through hole 17
The water flows out into the external passageway 13 through the through hole 16, pushes up the upper check valve 18, and reaches the upper cylinder 14 through the through hole 16. At this time, the upper cylinder 14 is also working, so it acts in the direction of increasing the volume, but since the amount of liquid from the lower cylinder 15 is large, the excess liquid passes through the through hole 21 of the operation pipe 20 and flows into the inner passage 23. It flows out and is discharged from the discharge port 23. - When the operating pipe 20 is pushed down by these series of actions, the discharge amount expressed by the product of the pressure receiving area of the lower cylinder 15 and the operating stroke is subtracted from the discharge amount expressed by the product of the pressure receiving area of the upper cylinder 14 and the operating stroke. This amount is approximately the same as the discharge amount when the operating pipe is moved upward (that is, the ratio of the pressure receiving areas of the upper and lower cylinders 14 and 15 is approximately 1).
:2), and in this way, when the operation pipe 20 moves upward and downward, substantially the same amount of discharge can be obtained. As described above, by continuously moving the operating pipe 20 up and down, the liquid in the container body 1 is discharged one after another intermittently, but at the same time, the pressure in the container body 1 decreases due to the decrease in liquid. Since the pressure is negative, it is necessary to replenish air as appropriate in order to continue discharging the liquid.

An air intake groove 3c formed in the housing 3 is provided for this purpose. FIG. 2 is an enlarged sectional view of the main part, and when the inside of the container body 1 becomes negative pressure due to the liquid discharge action, the packing 5 is attached between the opening la of the container body 1 and the flange 3b of the housing 3. The inner circumferential edge of the housing 3 is bent into the container body 1 as shown in the figure, and the air intake groove 3c of the housing 3 and the inside of the container body 1 are aligned so that the arrow A. Arrow B
Air is introduced as in When this air is introduced, the pressure between the outside pressure (atmospheric pressure) and the container body 1 becomes approximately the same, and the packing 6 returns to its original state (the position indicated by the chain line in Figure 2), and the outside air and the inside of the container body 1 are again separated. It will be sealed. FIG. 3 shows another embodiment of the present invention in which the upper check valve 18 formed on the outer peripheral wall of the cylindrical body 12 in FIG.
5, and is designed to reduce the diameter of the cylindrical body 12, and is effective for containers with a narrow outer diameter.

In order to avoid repeating the explanation, the same reference numerals are given to the parts having the same function, and the explanation will be omitted. Furthermore, FIG. 4 shows an example in which the reciprocating pump shown in FIGS. 1 to 3 according to the present invention is electrically operated and applied to an electric sprayer.
A power source 32 such as a suitable dry battery is installed inside the power source 32.
The motor 33 having a speed reduction device is rotated by the cam 34, and this rotation is transmitted to the L-shaped lever 36 which is rotatably supported on the fulcrum pin 35 and converted into reciprocating motion, and the operating member 38 is moved up and down by the connecting pin 37. The operation pipe 20 attached thereto is moved to suck up the spray liquid 39 in the container body 1 and atomize it through the spray hole member 40.

Coupled with the use of such a device, it is possible to effectively perform continuous, smooth fogging with little pulsation. Instead of the electric system shown in Figure 3, a manual operation system may also be used.
In this case, it is convenient to provide a spring (not shown) at an appropriate position, such as inside the cylindrical body 12 or near the cap 2, so as to always urge the operating pipe 20 upward. The ratio of the pressure receiving areas of the upper and lower cylinders 14 and 15 was explained as approximately 1:2, but depending on the deformation of each member and the degree of backflow, the ratio of the pressure receiving areas of the upper and lower cylinders 14 and 15 may be 1:2.
It is conceivable that the discharge amount due to the vertical movement of 0 will not be equal, and in this case, there is no problem in changing the ratio of the pressure-receiving areas to, for example, 1:25 to make the amount equal.

As detailed above, the reciprocating pump according to the present invention is provided with upper and lower cylinders and a piston body in a housing, and the upper and lower cylinders are operated as appropriate, and upper and lower check valves are provided at necessary locations, and the pressure receiving area of the upper and lower cylinders is The ratio is approximately 1:2
By doing so, the liquid can be discharged every time the operation pipe moves up and down, and it is easy to make the discharge amount approximately equal, so the liquid can be discharged without interruption and with less pulsation. In addition, by electrically operating the operation pipe, it can be applied to a sprayer efficiently, and since the container body does not constantly come into contact with the outside air, there is no possibility of liquid deterioration, discoloration, or evaporation. It has excellent effects such as being able to prevent.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the present invention; the left half is a vertical sectional view showing the operation pipe in its depressed state and the right half in its pulled up state, and Fig. 2 is a main part showing the state in which outside air is taken in. FIG. 3 is a longitudinal sectional view showing another embodiment of the upper check valve shown in FIG. 1, and FIG. 4 is a partially cutaway side view showing an example of electric operation. 1...Container body, 2...Cap, 3
...Housing, 6...Through hole, 7...
・...Lower check valve, 12... Cylindrical body, 13...
・・Gatai-ro, 14・・Upper cylinder, 15・・・・・・
...Lower cylinder, 16, 17...Through hole, 18...
... Upper check valve, 19 ... Piston body, 20 ...
...Operation pipe, 21...Through hole, 22...
...Discharge port, 23...Inner passage. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 A substantially bottomed cylindrical housing that is attached to the container body in a substantially liquid-tight manner and has a through hole formed at the bottom, and is attached to the through hole of this housing so as to close it, with the outlet side being the through hole and the inlet side being the above-mentioned one. A lower check valve formed to communicate with the inside of the container body, and a substantially cylindrical shape inserted into the housing with a gap, an outer passage formed in the gap and an upper and lower cylinder formed in the inner wall. A cylindrical body that connects the outer passage and the upper and lower cylinders, communicates the through hole of the housing and the lower cylinder, and has an upper check valve on the outer wall that closes the outer passage, and the upper and lower cylinders of this cylindrical body. It consists of a piston body inserted so as to be reciprocally movable, and an operation pipe whose base end is fixed to the piston body, has a discharge port at its distal end, and has a through hole communicating with the upper cylinder, and is connected to the lower cylinder. A reciprocating pump characterized in that the pressure receiving area is formed larger than the pressure receiving area of the upper cylinder, and the pump is configured to discharge liquid every time the operating pipe reciprocates.