JPS599115Y2 - Diaphragm pump - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a diaphragm pump used, for example, in a vacuum pump.

[Background of the invention] Conventionally, as shown in Japanese Patent Application Laid-Open No. 50-65911, it was necessary to separately fix the valve device and the cylinder head, and to fix the cylinder head and the cover, resulting in poor assembly workability.

[Purpose of invention]

An object of the present invention is to improve the ease of assembly by allowing the cylinder head, valve device, and cover to be assembled in one fixed operation.

[Summary of the idea]

The features of this invention include a pair of valve storage chambers recessed in the cylinder head from the upper end surface toward the diaphragm chamber, a pair of through holes that communicate between both valve storage chambers and the diaphragm chamber, and one valve storage chamber. In order to seal the opening surface of the valve storage chamber to the upper end surface of the cylinder head, A thin plate-like cover is attached, and each valve element is held within the valve storage chamber by the cover.

[Example of idea]

The present invention will be explained in detail below based on an embodiment shown in the drawings.

The example uses a vacuum (
The present invention is applied to a vacuum pump that generates negative pressure.

1 is a vacuum tank, 2 is a pump, and 3 is a motor for driving the pump.

An eccentric cam 4 is fixed to the end of the shaft of the motor 3, and a bearing 5 is fixed to the outer periphery of the cam 4.

The inner circumferential surface of a connecting rod 6 is fitted and fixed to the outer circumference of the bearing 5 to form a crank mechanism of the pump 2.

A diaphragm holder 8 is attached to the upper end of the cooking rod 6 via a crank pin 7.
Both sides of the diaphragm 9 are clamped.

The peripheral edge of the diaphragm 9 is clamped to the upper end of a pump casing 10 fixed to the end of the moder 3 by a cylinder head 11.

The cylinder head 11 has a valve storage chamber 12 recessed from the top surface of the cylinder head 11 toward the diaphragm 9 side.
13 is prominent.

A diaphragm chamber 14 is defined between the lower end surface of the cylinder head 11 and the diaphragm 9.

The cylinder head 11 is formed with a suction port 15 that communicates with the Bakim tank 1, and a seal ring 17 held between the tank 1 and the cylinder head contacts the suction port 15.
5 and the tank are sealed.

The suction port 15 communicates with the valve storage chamber 13, and the valve storage chamber 1
A valve 16 is pressed against a valve seat formed at the open end of the valve 3 by a spring 18.

The valve housing chamber 13 communicates with the diaphragm chamber 14 through a through hole 19 .

The diaphragm chamber 4 communicates with the valve housing chamber 12 through a through hole 20, and a valve 21 is pressed by a spring 22 onto a valve seat formed at the opening end of the through hole 20 to the valve housing chamber 12. .

The valve storage chamber 12 communicates with a discharge port 24 via a filter 23 .

A thin plate cover 25 is provided on the upper end surface of the cylinder head 11 for sealing the open ends of the valve storage chambers 12 and 13 and for pressing the springs 18 and 22 to press the valve bodies 16 and 21 against each valve seat.
is installed.

A seal ring 26 is provided around the opening surface of the valve housing chamber 13 to isolate the valve housing chamber 13 from the atmosphere.

The cover 25 and the cylinder head 11 are fixed by caulking or screwing (not shown).

Assembling the valve device is completed with only the above-mentioned fixing work.

1a is the negative pressure outlet of the vacuum tank.

The vacuum pump constructed as described above operates as follows.

When the shaft of motor 3 rotates and the eccentric cam rotates,
The cooking rod 6 reciprocates up and down.

As a result, the diaphragm 9 is displaced up and down, and the diaphragm chamber 14 repeatedly expands and contracts.

When the diaphragm 9 displaces downward and the diaphragm chamber expands, the pressure in the valve storage chamber 13 decreases, overcoming the force of the spring 18, the fluid in the tank pushes up the valve 16 and is sucked into the diaphragm chamber.

Next, when the diaphragm 9 is displaced upward, the pressure rise due to the contraction of the diaphragm chamber 14 causes the valve body 21 to move against the spring 2.
The fluid is pushed up by overcoming the force of 2, and the fluid is discharged from the diaphragm chamber 14 through the discharge port 24.

At this time, the valve body 16 is pressed against the valve seat by the increased pressure in the valve housing chamber.

[Effect of idea]

As explained above, according to the present invention, the valve device to be assembled into the cylinder head is held by a cover fixed to the cylinder head to close the valve storage chamber, making the assembly work extremely easy. .

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a vacuum pump showing an embodiment of the present invention. 1...Vacuum tank, 2...Pump, 3...
Motor, 11... Cylinder head, 12. 13...
・Valve storage chamber, 16, 21...valve body, 25...cover

Claims (1)

[Claims for Utility Model Registration] 1. A pair of valve devices that alternately open and close a fluid suction passage and a fluid discharge passage in synchronization with the reciprocation of the diaphragm in order to transport fluid by the reciprocation of the diaphragm; The cylinder head includes a cylinder head that houses a valve device, and a diaphragm chamber that is formed between the cylinder head and a diaphragm and whose volume changes periodically as the diaphragm reciprocates, the cylinder head having an upper part. A pair of valve storage chambers are recessed from the end face toward the diaphragm chamber, a pair of through holes communicate the valve storage chambers with the diaphragm chamber, and a fluid suction port communicates with the valve storage chambers. a suction passage that communicates with the valve housing chamber and a discharge passage that communicates the valve housing chamber with a fluid discharge port; A diaphragm pump characterized in that each of the valve bodies is held within the valve storage chamber by the cover. 2. In the utility model registration claim described in claim 1, each of the valve bodies is pressed against a valve seat by the other end of a helical spring whose one end abuts the cover, and the fluid suction port and the one valve The storage chamber communicates with the one valve body, the one valve housing chamber and the diaphragm chamber communicate directly, and the other valve housing chamber and the diaphragm chamber communicate with each other through the other valve body. The diaphragm pump is characterized in that the other valve storage chamber and the fluid discharge port are in direct communication with each other.