JP2569480Y2 - Diaphragm pump - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a diaphragm pump.

[0002]

2. Description of the Related Art When driving a diaphragm pump with a fixed amount of hydraulic oil being taken in and out by a plunger of a hydraulic cylinder, the incorporation of air or gas into the hydraulic oil is a major cause of deterioration of the pump's constant feed performance. I have. For this reason, various means have been devised for evacuating air or the like from the working oil being used, including the invention of the present applicant, Japanese Utility Model Publication No. 47-30970, and the function is actually exhibited. Nevertheless, depending on the size of the pump, depending on the size of the pump, at the time of test operation when hydraulic oil has just been put into the hydraulic cylinder and after overhaul repair at the production site, it will take 24 hours to regain strict quantitative feed performance.
It usually takes up to 48 hours.

[0003]

As described above, when hydraulic oil is supplied or overhauled, it takes time to recover the quantitative performance of the pump because it is unavoidable to vent the oil. I was However, the inventor took this as a research subject and found that the following three factors were factors. 1) Dissolved air (gas) in hydraulic oil 2) Structurally unavoidable air pocket 3) Air trapped in gland packing Based on research results on air ), 3) We obtained this idea in search of drastic measures.

[0004]

The diaphragm pump according to the present invention is a diaphragm pump in which hydraulic oil pushes and pulls a diaphragm membrane surface by reciprocation of a plunger to generate a discharge and suction action. A hydraulic oil supply path connecting the oil tank, and a discharge path to a relief valve that discharges excess hydraulic oil from the input chamber. A connection valve, a stop valve for opening and closing between discharge passages, a joint of parts forming the input chamber, and an air-tight holding material of a bearing portion of the plunger are O-rings for vacuum holding. .

[0005]

The present invention provides a vacuum hose connection port and a stop valve in a discharge path for discharging surplus hydraulic oil from the input chamber of the diaphragm.
Vacuum suction is possible up to the inside of the hydraulic cylinder of the plunger. With this, the hydraulic oil can be filled after the above-described “structurally unavoidable air pool” and “air trapped in the gland packing” are eliminated in advance. If only the “dissolved air in the hydraulic oil” is used, it can be easily removed with the existing air release equipment. The present invention facilitates the vacuum holding by changing the joints of the components forming the input chamber of the diaphragm and the sealing material of the bearing portion of the plunger from the conventional packing or gasket to an O-ring.

[0006]

FIG. 1 shows an embodiment in which the present invention is applied to a double diaphragm pump. 1 plunger, 2 hydraulic side diaphragms, 2 wetted side diaphragms 2a, 3 input chambers, 4 oil tanks, 4 hydraulic oil supply paths, 6 discharge paths, 6 relief valves in oil tanks, 7 air vents Equipment 7a, vacuum hose connection port 8, stop valve 9 for opening and closing between this and discharge path 6, O-ring 10,1
0 ', 11 for the flow control needle valve of the supply path 5, 11 for the cylinder of the plunger, 13 for the discharge port of the pump, 14 for the suction port, 15 for the output chamber of the diaphragm, and between the two diaphragms 2 and 2a. 16 intermediate partition walls, 17 and 18 diaphragm holding plates on both sides thereof, 19 hydraulic oil through holes which are through holes of the intermediate partition wall 16 and the holding plate 17, and 1 intermediate partition wall.
The sealing liquid injection machine for filling the through-hole 19 in the hydraulic fluid 6 with hydraulic oil in advance
0, 21 is the gland packing of the hydraulic cylinder 12, and 22 is the presser nut.

In the figure, the diaphragms 2 and 2a are drawn in a straight line (neutral position) for easy understanding, but when the plunger 1 moves from the solid line position to the right chain line position in the figure, the diaphragm 2 leans toward the concave surface of the holding plate 17, The diaphragm 2a is the intermediate partition 1.
Approach the concave surface of 6. Conversely, when the plunger 1 protrudes leftward in the figure, the diaphragm 2 leans toward the concave surface of the intermediate partition 16 and
The diaphragm 2a approaches the discharge / suction port side inner wall of the output chamber 15. As a result, it is well known that the liquid contact side diaphragm 2a moves back and forth by the plunger 1 to reciprocate to perform a pump action.

The features of this embodiment are that a vacuum hose connection port 8 is provided in the excess oil discharge passage 6, which can be opened and closed by a stop valve 9, and that a plate which is conventionally provided at the joint of the components forming the input chamber 3 is provided. Replace the packing with the O-ring 10 and replace the gasket contained in the plunger bearing with the O-ring 1.
That is, it has been changed to 0 '. This connects the vacuum hose from the vacuum pump to the connection port 8, closes the needle valve 11, opens the stop valve 9, suctions vacuum, and then opens the needle valve 11 to send hydraulic oil from the oil tank 4.
Since the air trapped in the air pool and the gland packing 21 is eliminated, the actual operation can be started immediately if there is no dissolved air in the hydraulic oil. Even if there is dissolved air in the hydraulic oil, it can be removed by the conventional air venting equipment 7a in the oil tank 4 in a short time of operation and the actual operation can be started.
Although one embodiment has been described above, it is needless to say that the embodiment of the present invention can be variously changed and applied according to the well-known technology of a mechanical designer, and it is equally applicable to a single diaphragm pump instead of a double type. .

[0009]

[Effect of this invention] This invention researched and analyzed the phenomenon that it took a long time for the constant feed performance of the diaphragm pump to stabilize after starting operation, and presented a drastic measure. In other words, it was confirmed that the conventional blind spot was in the residual air in the structural air pool and the gland packing, and as a means for removing the air, a vacuum hose connection was newly established. The air removal time after filling could be reduced to one-tenth of the conventional value.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view of one embodiment of the present invention.

[Explanation of symbols]

 8 Vacuum hose connection port 9 Stop valve 10 O-ring 10 O-ring 11 Needle valve

Claims (1)

(57) [Scope of request for utility model registration] 1. A diaphragm pump in which hydraulic oil pushes and pulls a diaphragm membrane surface by a reciprocating movement of a plunger to generate a discharge and suction action, wherein a hydraulic oil supply path connecting an input chamber of the diaphragm and an oil tank has an excessive oil supply path. In a device having a discharge path to a relief valve that discharges hydraulic oil from an input chamber, as a means for removing air before filling with hydraulic oil, a vacuum hose connection port is provided in the discharge path, and a connection between the connection port and the discharge path is opened and closed. A diaphragm pump in which a stop valve is added, and a seam for holding a vacuum is used as a joint of parts forming the input chamber and an air-tight holding material of a bearing portion of the plunger.