JPH03253780A - Small pump - Google Patents

Abstract

PURPOSE:To reduce noises and vibrations and improve the pump performance by driving multiple diaphragm sections forming multiple pump chambers with a drive body performing conical movement, and connecting the drive body and the diaphragm sections via connecting shafts extended in the tangent direction. CONSTITUTION:A drive shaft 4 inclined by the preset angle is provided on a crank base 3 fitted to the output shaft 2 of a motor 1, and a drive body 9 is fitted to the drive shaft 4. Multiple diaphragm sections 8 driven by the drive body 9 are arranged at a nearly uniform interval in the peripheral direction with respect to the axis of the output shaft 2. The diaphragm sections 8 and the drive body 9 are connected by inserting bar-shaped connecting shafts 10 provided on the outer periphery section of the drive body 9 in the tangent direction with respect to the outer periphery into through holes provided at the lower end section of the diaphragm sections 8. Air is sucked into pump chambers 12 formed between the diaphragm sections 8 and a pump case 11 through an intake port 13 by the drive of the diaphragm sections 8 and discharged through an exhaust port 13 after compression.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a small pump used in a pressure reducing device for a sealed packaging device.

2. Description of the Related Art Conventionally, this type of small pump has been developed, for example, in Japanese Patent Application Laid-open No. 61
As shown in Japanese Patent No. 291484, there is a structure as shown in FIG.

That is, a crank stand 3 (5) attached to the output shaft 2 of the motor 1 is provided with a drive shaft 4 inclined at a predetermined angle, and a drive body 5 rotatably provided is further attached to this drive shaft 4. A connecting portion of a diaphragm portion 6, in which a plurality of diaphragms are arranged at approximately equal intervals in the circumferential direction, is fitted into a through hole provided in the outer peripheral portion of the drive body 5 from top to bottom. Diaphragm part 6
are engaged with the pump case 7 to form a plurality of pump chambers.

When the motor 1 rotates, the drive body 5 repeats a rocking motion based on the plate-spinning principle due to the grinding motion of the drive shaft 4, which causes the diaphragm portion 6 to move up and down.
The structure is such that a pump action occurs.

Problems to be Solved by the Invention However, with such a structure, the diaphragm portion 6
Since the angle formed by the drive body 5 and the drive body 5 is always constant, and the drive body 5 is tilted due to the rocking motion because the angle is almost perpendicular, the diaphragm portion 6 similarly tilts and moves up and down repeatedly, as shown in FIG. When the diaphragm part 6 of the driving body 5 reaches the highest point or the lowest point, the diaphragm part 6 also tilts the most. As a result, the diaphragm portion 6 rubs against the pump case 7, causing noise and vibration, deteriorating the performance of the pump, and significantly reducing the durability of the diaphragm portion 6.

Furthermore, when an attempt is made to operate it as a vacuum pump for suction, the inside of the pump case 7 is depressurized and the diaphragm section 6 is pushed upward, resulting in the diaphragm section 6 suddenly coming off from the drive body 5 during operation. There was also the problem that the pump would not function properly as a pump. In the end, such conventional pumps have been used only as pressurizing pumps for exhaust.

Accordingly, the first object of the present invention is to provide a small pump that has high performance and can also be used for suction, eliminating these drawbacks.

The second purpose is to securely position the connecting part between the driving body and the diaphragm part used to achieve the first purpose, to allow the diaphragm part to stably move up and down in a fixed position, and to achieve stable movement. The objective is to ensure that performance is achieved.

Means for Solving the Problems In order to achieve the above-mentioned first object, the small pump of the present invention has a drive body that makes a countersunk movement due to the rotation of the output shaft of a motor, and a drive body that rotates around the axis of the output shaft. a plurality of diaphragm parts arranged at approximately equal intervals in the circumferential direction and driven by the drive body; and a pump case that engages with the diaphragm parts to form a plurality of pump chambers, the drive body and the diaphragm part The connection part consists of a plurality of connection shafts provided on the outer periphery of the drive body in a tangential direction to the outer periphery according to the number of diaphragm parts, which are fitted into through holes provided at the lower end of the diaphragm part. This is what I connected.

Further, in order to achieve the second object, the small pump of the present invention is provided with a flange portion having a slightly larger diameter than the through hole at the lower end of the diaphragm portion at the end of the connecting shaft.

Function: Even if the drive body is tilted due to rocking motion, the small pump of the present invention has a rotatable structure in which the connecting portion between the drive body and the diaphragm part is able to rotate, so that the force that tends to tilt the diaphragm part is suppressed. The diaphragm part can repeatedly move up and down vertically without tilting. Furthermore, when used as a pump for decompression purposes, even if the diaphragm part tries to push upward, the diaphragm part is attached to the outer periphery of the drive body with a connecting shaft that is tangential to the outer periphery. It is something that cannot be lost because it is supported by

Further, by providing a flange portion on the connecting shaft, the flange portion prevents the connecting portion of the diaphragm portion from sliding sideways on the connecting shaft, and the diaphragm portion operates stably in a fixed position.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. The same parts as those of the conventional example are given the same reference numerals, detailed explanations are omitted, and the following explanation focuses on the differences.

In FIGS. 1 to 3, reference numeral 8 denotes a plurality of diaphragm portions arranged at approximately equal intervals in the circumferential direction with respect to the axis of the output shaft 2 and driven by the driving body 9. The drive body 9 is rotatably provided on the drive shaft 4. The connection between the diaphragm part 8 and the driving body 9 is achieved by using a rod-shaped connecting shaft 10 provided on the outer periphery of the driving body 9 so as to be tangential to the outer periphery.
It is configured to be connected by fitting into a through hole 18 provided at the lower end of the diaphragm portion 8. 11 is a pump case that engages with the diaphragm portion 8 and forms the pump chamber 12;
Reference numeral 3 designates an intake port for sucking air into the pump chamber 12, I4 an intake valve that prevents backflow from the pump chamber 12 to the intake port 13, 15 an exhaust port, and 16 an exhaust valve.

Next, the operation of the configuration of this embodiment will be explained. First, when the motor 1 operates and the crank stand 3 rotates via the output shaft 2, the drive shaft 4, which is tilted and fixed to the crank stand 3, generates a grinding motion around the output shaft 2. The drive body 9, which is rotatably attached to the drive shaft 4, releases the rotational force of the drive shaft 4 by sliding and generates a rocking motion based on the principle of a plate turner. The diaphragm portions 8 arranged on the outer periphery at substantially equal intervals in the circumferential direction repeatedly move up and down sequentially. As a result, fluid such as air sucked in from the intake port 13,
The air flows into the pump chamber 12 through the intake valve 14 and flows into the pump chamber 12 through the exhaust valve 16.
It passes through the exhaust port 15 and is discharged to the outside.

At this time, in the conventional structure shown in FIG.
When the pump tilts due to the rocking motion, the diaphragm section 6 similarly tilts while repeatedly moving up and down, causing the diaphragm section 6 to rub against the pump case 7, causing noise and vibration, and reducing pump performance. The durability of the diaphragm portion 6 was significantly reduced. In addition, the intake port 13
When a load such as a bag for sealed packaging is connected to the pump case 7, the pressure inside the pump case 7 is reduced and the diaphragm part 6 is pushed upward, and the connecting part of the diaphragm part 6 is pushed up into the through hole provided in the drive body 5. Since the diaphragm part 6 is fitted downward from the top, the diaphragm part 6 comes off from the drive body 5 during operation, and the pump no longer functions as a pump.

However, by making the connecting part between the diaphragm part 8 and the driving body 9 rotatable as in the embodiment of the present invention, even if the driving body 9 is tilted due to the rocking motion, the diaphragm part 8 will not tilt. This allows the diaphragm portion 8 to repeatedly move up and down vertically without tilting. As a result, the diaphragm section 8 and the pump case 11 do not rub against each other and generate vibration or noise, allowing smooth operation, improving pump performance, and improving the durability of the diaphragm section 8. can. Furthermore, by making the connection direction of the diaphragm part 8 and the driving body 9 tangential to the outer periphery of the driving body 9, even if the diaphragm part 8 is pushed upward, it will not come off, and it can be used as a pressure reducing pump. I can do it.

Next, another embodiment will be described using FIG. 4. Fourth
In the figure, reference numeral 17 denotes a flange portion provided at the end of the connecting shaft 10, which has a slightly larger diameter than the through hole 18 at the lower end of the diaphragm portion 8. In this embodiment, the flange portion 17 is fitted onto the connecting shaft 10, but the flange portion 17 and the connecting shaft 10 may be integrated. By providing this flange portion 17, the connecting portion of the diaphragm portion 8 can be firmly positioned on the connecting shaft 10, the diaphragm portion 8 can stably operate in a fixed position, and stable performance can be obtained. It will be done.

Effects of the Invention As described above, in the small pump of the present invention, the connecting shaft provided on the outer periphery of the drive body so as to be tangential to the outer periphery is fitted into the through hole provided at the lower end of the diaphragm portion. By using a configuration in which the pump is connected to the pump, it is possible to reduce noise and vibration, improve the performance of the pump, and increase the durability of the diaphragm. Furthermore, when used as a small pump for reducing pressure for sealed packaging, it is possible to prevent the diaphragm portion from coming off from the driving body.

Furthermore, in the small pump of the present invention, by providing a flange portion at the end of the connecting shaft with a diameter slightly larger than the through hole at the lower end of the diaphragm portion, the diaphragm portion can stably operate in a fixed position. It is possible to obtain stable performance.

The small pump according to the present invention not only has higher performance than conventional pumps as a pressurizing pump for exhaust, but also can be used as a depressurizing pump for suction.
A single pump can be used for both exhaust and intake, making it extremely convenient and highly practical.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of a small pump showing an embodiment of the present invention, Fig. 2 is an external perspective view of the driver, and Fig. 3 is an enlarged perspective view of the main parts showing the connecting portion between the diaphragm and the driver. , FIG. 4 is an enlarged perspective view of a main part showing a connecting portion between a diaphragm portion and a driving body in an embodiment in which a flange portion is provided on the connecting shaft, and FIG. 5 is a longitudinal sectional view of a conventional small pump. DESCRIPTION OF SYMBOLS 1... Motor, 2... Output shaft, 8... Diaphragm part, 9... Drive body, 10... Connection shaft, 11...
Pump case, 12...Pump chamber, 17...Flange portion, 18...Through hole.

Claims (2)

[Claims] (1) A drive body that makes countersunk motion due to the rotation of the output shaft of the motor, a plurality of diaphragm parts arranged at approximately equal intervals in the circumferential direction with respect to the axis of the output shaft and driven by the drive body; and a pump case that engages with a diaphragm part to form a plurality of pump chambers, and the connection part between the drive body and the diaphragm part is connected to the outer periphery of the drive body in a tangential direction to the outer periphery according to the number of diaphragm parts. A small pump in which a plurality of connecting shafts are connected by fitting them into through holes provided at the lower end of the diaphragm part. (2) The small pump according to claim 1, wherein the end of the connecting shaft is provided with a flange portion having a slightly larger diameter than the through hole at the lower end of the diaphragm portion.