JPS59185884A - Diaphragm pump - Google Patents

Abstract

PURPOSE:To provide a double diaphragm pump without a large intake and discharge manifold and a slide portion by providing inside pump chambers and forming a valve chamber provided between both pump chambers directly with an intake hole and a discharge hole. CONSTITUTION:Pump chamber 2 are provided on both end surfaces of a rectangular parallelpiped pump body 1, and an intake hole 6 and a discharge hole 7 are formed in a valve chamber 3 provided in the central portion of the pump body 1. And diaphragms 8 are stretched respectively in both pump chambers 2. When compressed air is then supplied to a change-over valve 15 it flows into either of right and left drive fluid chambers 11 through a spool valve 16 to press and bulge the diaphragm 8 and discharge material in the pump chamber 2 from the discharge hole 7 through a check valve 5. Then, the diaphragm 8 at the other side is moved so that negative pressure is produced in the pump chamber 2 to suck the material. The movement of the diaphragm 8 then is detected and pressurized air is released through the change-over valve 15.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diaphragm pump. [Technical background of the invention and its problems] Generally, the diaphragm rams of two pumps in a Guian ram pump are connected by a connecting rod. The so-called double diaphragm pump, which operates synchronously, was developed in 1985.
57902, a diaphragm is provided on the left and right sides of the main body, a pump chamber is provided on the outside of this diaphragm, a driving fluid chamber is provided on the inside, a connecting rod is provided inside the main body to connect the left and right diaphragms, and the pump chambers on both sides are provided outside the main body. with suction and discharge manifolds that connect, or USP. 4,334
, No. 837, a driving fluid chamber is provided on the outside, a pump chamber is provided on the inside, and a valve chamber and suction and discharge holes are provided between the two pump chambers.
Two types are known: one has a connecting rod inside the main body that connects both diaphragms, but the former has a large suction/discharge manifold that connects both pump chambers on the outside, so the whole pump is closed. The latter has a pump chamber on the inside and a connecting rod that connects both diaphragms inside the main body, so a gasket is required on the part where this connecting rod slides, and it does not slide on the wetted part. The diaphragm pump does not have a special feature of having no parts to remove, and depending on the liquid being pumped, such as chemicals, the repacking is easily damaged and can cause malfunctions.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a double diaphragm pump structure that does not require large suction/discharge manifolds, has no sliding parts in contact with liquid, is compact, and is less likely to malfunction.

[Summary of the invention]

The diaphragm pump of the present invention has a driving fluid chamber on the outside,
A connecting rod connecting both diaphragms of a double diaphragm pump with a pump chamber formed inside is provided using the putt space outside the pump chamber, and a valve chamber communicating with the pump chamber is provided between both pump chambers. A suction hole and a discharge hole are provided through a stop valve.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail with reference to an embodiment illustrated in FIGS. 1 and 2.

As shown in the figure, circular pump chambers (2) are formed on both end surfaces of a rectangular parallelepiped pump body (1) with both end surfaces square, and the pump is connected to both pump chambers (2) and located between them. A valve chamber (3) is provided in the center of the main body (1).
), each check valve (4), (5) installed in
A suction hole (6) and a discharge hole (forming force) are connected to the pump body (1) through the pump body (1), and a dian ram (8) is installed in each of the pump chambers (2), which is connected to the driving fluid chamber ( 9
This diaphragm (8) is supported by the driving fluid chamber housing α0) formed with a I'll do what I do.

And the retainer plate (
11), each of which is provided with an actuating rod U so as to protrude airtightly from the drive fluid chamber housing 00) via the drive fluid chamber housing 00);
Each control bar (13) is at the tip of this actuating rod.
and both ends of the connecting rod α (1) are fixed between the control bar (13).This connecting rod 04) is connected to the pump body (1).
, the respective pump chambers (
2) The valve chamber (3), suction hole (6), discharge hole (7), drive fluid chamber (II), etc. should be located in a put space that does not interfere with the valve chamber (3), suction hole (6), discharge hole (7), drive fluid chamber (II), etc., and related to the reciprocating movement of the diaphragm (8). The switching valve α■ and the flow path for alternately supplying and discharging the driving fluid to and from the two moving fluid chambers (9) are provided in the pump body (1) or the driving fluid chamber housing 00), etc., the one shown is one side. A known switching valve consisting of a pilot valve ση which switches the main switching spool valve (I6) and the spool valve [6] by detecting the position of the diaphragm (8) is shown in the driving fluid housing (10) of the drive fluid housing (10). ) is a cover.

Next, the effect will be explained. For example, if pressurized air is supplied as the driving fluid to the switching valve (L5), then the spool valve α
Depending on the position of 6), either the left or right driving fluid chamber CIl+
Pressurized air is supplied to press the diaphragm (8),
The diaphragm (8) is expanded into the pump chamber (2), and the material in the pump chamber (2) is forcefully discharged from the discharge hole through the check valve (5). Ba = (
13), the diaphragm (8) on the other side is moved via the connecting rod 0a, the control bar (13) on the other side, and the operating rod 02+, and the diaphragm (8) on the other side is moved from the pump chamber (2) on the other side.
Since the pump chamber (2) is discharged, there is a negative pressure in the pump chamber (2). The switching valve aω is switched, and the pressurized air is transferred to the drive fluid chamber α on the opposite side.
1), and the pressurized air in the drive fluid chamber (11) is released to the atmosphere through the switching valve head. By repeating this action alternately, the pressure air in the drive fluid chamber (11) is repeats inhalation and exhalation.

[Effect of idea]

According to the present invention, since the pump chamber is set inside, a valve chamber is formed between both pump chambers, and the suction hole and discharge hole are formed directly in this valve chamber, so there is no need for a suction and discharge manifold, and the entire pump can be made smaller. In addition, since the connecting rod connecting both diaphragms is located in the pump space outside the pump chamber, it helps to reduce the overall size, and it is necessary to install the gasket on which this connecting rod slides in a position where it contacts the material being pumped. The durability of this gasket is improved and the causes of failure are significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the diaphragm pump of the present invention, and FIG. 2 is a sectional view taken along the line A--A in FIG. (1)・Pump body, (2)・Pump chamber, (3)・・
・-Valve chamber, (4), (5)-Check valve, (6) Suction hole, (
7) Discharge hole, (8)・Diaphragm, (9)・-driving fluid chamber, 02)・Operation rond, 03)-control bar, αa
・Connecting rod, α-cutter, switching valve. Patent applicant Yamada Yuki Manufacturing Co., Ltd.

Claims (1)

[Claims] A diaphragm is provided on the left and right sides of the pump body, a pump chamber is provided inside the diaphragm, a driving fluid chamber is provided outside the diaphragm, a valve chamber is formed between the two pump chambers on the inside, and communicates with both pump chambers. A suction hole and a discharge hole are provided, which communicate with each other via a check valve, and an operating rod is fixed to both of the diaphragms so as to be slidable in an airtight manner from the driving fluid chamber,
A control bar is attached to the tip of the operating rod, and both ends of the connecting rod are fixed between the control bars to control the supply and discharge of the driving fluid to the left and right driving fluid chambers in relation to the reciprocating movement of the diaphragm. A diaphragm pump equipped with a switching valve that alternates between