JPS5824635B2 - kuuki pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a positive displacement air pump that changes the volume of a pump chamber by vibrating a vibrating membrane such as a diaphragm using an electromagnet.

What is important in this air pump is to improve pump efficiency, and this is greatly influenced by the operating characteristics of the suction and discharge valves in the pump chamber, and effective cooling of the heat generating part also affects pump efficiency. give.

Here, regarding the improvement of the operating characteristics of the valve,
No. 918 discloses that the suction valve is formed in the center of the vibrating membrane so as to face into the pump chamber.

In this case, the operation of the suction valve is not only caused by pressure changes in the pump chamber caused by the vibration of the vibrating membrane, but also the inertia applied to the suction valve, which reciprocates with the vibrating membrane, acts as an auxiliary force for opening and closing the suction valve. Therefore, the operating characteristics regarding the suction valve are extremely good.

However, in the method disclosed in this publication, a permanent magnet is fixed to the diaphragm, and the diaphragm is vibrated by the magnetic repulsion and attraction between the iron core and the permanent magnet, which are excited by a coil. Therefore, there is a problem that the driving force for driving the vibrating membrane is weak, and the operating characteristics of the discharge valve are not good.

In terms of the above driving force, it is preferable to connect a movable iron core to the vibrating membrane and drive the vibrating membrane with the movable iron core because the magnetic gap can be shortened, but the configuration for cooling the movable iron core is preferable. Is required.

Japanese Utility Model Publication No. 42-64 discloses a device in which a movable iron core is cooled by providing a groove on the outer periphery and allowing air to pass through the groove.

However, such a cooling structure cannot be said to be very effective, and the suction valve is not provided on the vibrating membrane as shown in the above-mentioned publication, so the operating characteristics cannot be said to be good.

The present invention has been made in view of these points, and its purpose is to provide a device in which a vibrating membrane is driven by a movable iron core, in which both the suction valve and the discharge valve have good operating characteristics, and To provide an air pump in which a movable iron core is effectively cooled and, therefore, pump efficiency is extremely high.

To explain the present invention below, the present invention connects in the axial direction a movable iron core driven by an electromagnet and the other end of the drive shaft, one end of which is joined to a vibrating membrane constituting one side wall of the pump chamber. A ventilation hole is drilled through the core and drive shaft in the axial direction, and a suction valve is installed at the front end of this ventilation hole to expose it inside the pump chamber.A discharge valve is installed on the other side wall of the pump chamber, and a It is characterized by the fact that the suction valve and discharge valve, which open and close according to pressure changes, are arranged on the axis of the movable iron core and the drive shaft.

The suction valve moves together with the vibrating membrane, and the inertia of this movement becomes a force that opens and closes the suction valve along with pressure changes in the pump chamber, improving its operating characteristics. By locating not only the suction valve but also the discharge valve on the axis of the movable iron core, which is considered to be thick, these responses can be performed efficiently and the operating characteristics of the suction and discharge valves have been improved. Moreover, the air reaching the intake valve is made to pass through the movable iron core and the inside of the drive shaft, thereby achieving efficient cooling.

The present invention will be explained below based on the illustrated embodiments.

FIG. 1 shows a cross section, in which a recess that opens rearward is provided at the rear of the casing 1, and a space 16 is formed between the rear end of the casing 1 and a rear cover 8 that is provided with a lid.
Electromagnets 1 are fitted into both sides of this cavity 16.

A recess that opens rearward is formed in the rear part of the rear cover 8, and a filter 10 is disposed within this recess.

Furthermore, a cleaner cover 11 is provided on the rear opening edge of the rear cover 8, and air is sucked in through the intake port 12 of the cleaner cover 11, and the air that has passed through the filter 10 is removed from the air inlet 13 of the rear cover 8. 16.

In the figure, 2 is a movable iron core inserted between the magnetic pole faces 14 of the electromagnet 1 so as to be able to reciprocate through an air gap, and is made of silicon steel plate or soft iron.

The rear part of the drive shaft 3, which is made of aluminum with excellent thermal conductivity, is screwed into a threaded portion carved on the outer periphery of the front half of the movable iron core 2.

The drive shaft 3 is slidably inserted into a cylindrical bush 15 fixedly disposed in the center of the casing 7.

This bushing 15 is made of a sliding material with a low coefficient of friction, such as fluororesin.

Further, a flange 26 extends from the front end of the drive shaft 3, and a coil spring 9 is pressed against the rear surface of the flange 26, so that the drive shaft 3 is spring biased forward.

17 is an annular rib for fixing the coil 9 behind the collar portion 26.

Reference numeral 4 denotes a ventilation hole bored in the shaft portions of the movable iron core 2 and the drive shaft 3, and the opening at the rear end communicates with the cavity 16.

A pump chamber case 20 is attached to the front end of the casing 7, and the entire periphery of a vibrating membrane 5, such as an elastic diaphragm, is clamped and held at the joint between the casing 1 and the pump chamber case 20. It is.

Reference numeral 27 denotes a valve plate attached to the front surface of the flange 26 via the vibrating membrane 5, and an intake hole 29 communicating with the ventilation hole 4 is bored in the valve plate 27. The suction valve 6, which is fixed with a screw 28, is in elastic contact.

A pump chamber 33 is formed by the rear recess of the pump chamber case 20, the vibrating membrane 5, and the plate 21.
The discharge port 19 of No. 3 is bored in the center of the pump chamber case 20, and is opened and closed by the discharge valve 18.

A front cover 21 is provided at the front end of the pump chamber case 20, and is separated into a discharge chamber 30 and a muffling chamber 24 by a cylindrical rib 23, and a cutout groove 25 divides the discharge chamber 30 into
and the silencing room 24 are in communication.

Furthermore, the silencing rooms 24 are separated into classrooms by a partition wall 31 that connects the inner circumferential wall and the outer circumferential wall, and the silencing rooms 24 are communicated with each other through communication grooves 32 formed in the partition wall 31.

The front cover 21 is additionally provided with a discharge nozzle 22 that communicates with one of the silencing chambers 24.

Next, the present invention will be explained in detail.

First, when a half-wave rectified commercial AC power supply is applied to the electromagnet 1, pulse-like magnetic poles are generated on the magnetic pole surface 14 of the electromagnet 1, and the movable iron core 2 is periodically moved backward against the elastic force of the spring 9. Suction.

At this time, since the drive shaft 3 is biased forward by the spring, the movable iron core 2 and the drive shaft 3 periodically move back and forth.

When the drive shaft 3 is moved backward by the electromagnet 1, the collar 26 and the valve plate 27 are also moved backward against the elastic restoring force of the vibrating membrane 50, so that the pump chamber 33 is depressurized and the suction valve 6 is opened at the same time. Air is sucked into the pump chamber 33 through the ventilation hole 4.

Next, when the attractive force of the electromagnet 1 disappears, the spring 9 causes the flange 2 to
6 and the valve plate 27 move forward to compress the pump chamber 33, and at the same time, air is discharged from the discharge port 19 into the discharge chamber 30.

The air discharged into the discharge chamber 30 flows into the muffling chamber 24 through the notch groove 25 and is discharged to the outside from the discharge nozzle 22.

At this time, the pressure inside the vent hole 4 is also reduced, so that external air is introduced into the vent hole 4 through the suction port 12, filter 10, introduction port 13, and cavity 16.

By repeating the above operation, from the discharge nozzle 22 to the suction port 12
More inhaled air is periodically exhaled.

Further, new air continuously flows into the ventilation hole 4, so that the movable iron core 2 and the first drive shaft 3 are constantly cooled.

The suction valve 6 moves together with the movable iron core 2 and the drive shaft 3, and since the inertia of reversing the movement also acts on its opening and closing operations, the timing of its closing operation is particularly delayed. It has no compression leakage, has high suction efficiency, and has a high suction valve 6 and a discharge valve 1.
8 is arranged on the axis of the movable iron core 2 and the drive shaft 3, and considering that the drive shaft 3 reciprocates at high speed on this axis in the pump chamber 33, it is microscopically visible. Because this is the area where the dynamic pressure fluctuations are expected to be the largest,
In this respect as well, good operating characteristics can be obtained.

As described above, in the present invention, the operating characteristics of the suction valve and the discharge valve are good. It is also cooled from the inside by the intake air flowing through the vent hole provided in the shaft in the axial direction, and efficient cooling is achieved, resulting in good operating characteristics of the intake valve and discharge valve. , extremely high pump efficiency can be obtained due to efficient cooling of the drive shaft and movable iron core.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a perspective view of the same pump chamber case, in which 1 is an electromagnet, 2 is a movable iron core, 3 is a drive shaft, 4 is a ventilation hole, and 5 is a perspective view of the same pump chamber case. Vibrating membrane, 6 is a suction valve,
18 is a discharge valve, and 33 is a pump chamber.

Claims (1)

[Claims] 1 A movable iron core driven by an electromagnet and the other end of the drive shaft, one end of which is joined to the vibration membrane constituting one side wall of the pump chamber, are connected in the axial direction, and a movable iron core and the drive shaft are penetrated in the axial direction. A suction valve is drilled at the front end of the vent hole to expose it inside the pump chamber, and a discharge valve is installed on the other side wall of the pump chamber. An air pump characterized in that a valve is arranged on the axis of a movable iron core and a drive shaft.