JPH0450486A - Pressure feeding device - Google Patents

Abstract

PURPOSE:To eliminate limitation to membrane displacement ratio by consideration of a membrane life and make the whole body of a pressure feeding device compact and light by forming the sectional surface of an expansion body like bellows. CONSTITUTION:By letting drive fluid in from a drive fluid guide port 6 provided at an end part surface plate 5, an expansion body 2 like bellows is expanded. At this time, a discharge valve 8 is kept open, and a suction valve 7 closed, so a feed pressure is loaded on fluid in a pressure feed fluid chamber 10 to be in a discharging condition. By letting the drive fluid out from the drive fluid guide port 6, the expansion body 2 of bellows us contracted. At this time, the discharge valve 8 is kept closed, and the suction valve 7 opened, so new pressure feed fluid is sucked into a container 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to the pressurization of fluids, mainly when the fluid to be pressurized is abrasive or
This is a pumping device for fluids that are corrosive, toxic, etc., or fluids that contain particles or lumps, and for which it is undesirable to directly apply pumping force. Specific examples include highly abrasive construction mud, This invention relates to a device for pumping various types of corrosive sludge water.

(Prior art) As fluid pressure feeding means, impeller rotation type, piston reciprocating type, etc. are generally well known, but these are all methods that apply pressure directly to the fluid to be pumped, and are relatively fluid-free. Suitable for products with stable properties.

On the other hand, construction mud water, environmental waste sludge water, etc., which have been increasing in recent years, have relatively unstable properties and are diverse, so it can be said that a pump with a simple structure and indirect pumping is preferable.

Examples of conventional technology relatively suitable for the above-mentioned applications are shown in Figures 3 and 4.
Illustrated in the figure.

In the conventional example (Japanese Patent Publication No. 57-032755) shown in FIG. 3, a spherical expansion and contraction body 12 sandwiched between a container 1 and an end face plate 5 connects a drive fluid chamber 9 and a fluid to be pumped. By inflowing and inflowing the driving fluid from the driving fluid inlet 6 provided in the end face plate 5, the expansion and contraction body 12 can be expanded and contracted by ΔQ. suction of pumped fluid;
It has a structure that performs discharge.

In the conventional example shown in FIG.
The membrane-like expansion/contraction body 13 is divided into three separate chambers: a pressurized fluid chamber 10, a mediating fluid chamber 14, and a driving fluid chamber 9. By flowing the driving fluid into and out of the driving fluid chamber 9, There is a so-called diaphragm pump that suctions and discharges fluid to be pressurized by repeating expansion and contraction of two systems of expansion and contraction bodies, the expansion and contraction body 13 and the cylindrical expansion and contraction body 12.

As mentioned above, there are broadly two types of pressure feeding devices known for similar applications, both of which are equipped with an expansion and contraction body, and utilize the expansion and contraction actions of the expansion and contraction body to achieve the pressure feeding function indirectly. There is.

(Problem to be solved by the invention) The main point of this type of pressure feeding device is how compact and simple the structure can be made by considering the life strength of the expansion and contraction body that is the medium, and from this point of view, Judging from the above, the conventional method has the following problems.

That is, since the method utilizes expansion and contraction due to elastic displacement of the membrane constituting the expansion/contraction body, there is a constraint that the rate of displacement must be kept in a certain direction in order to ensure the life of the membrane.

At the same time, in order to ensure the required amount of pumping in one pumping operation, the size of the expansion and contraction body had to be determined taking into account the above-mentioned constraints, which resulted in a large container and a space problem. Means for Solving the Problems) That is, the present invention provides a pumping device that can expand and contract an expansion/contraction body by flowing a driving fluid into and out of a driving fluid chamber, and can indirectly pump the fluid to be pumped in the fluid chamber to be pumped to the outside. The pumping device is characterized in that the expandable body has a bellows-shaped cross section.

(Operations and Examples) The root cause of the problem lies in the use of the elastic displacement effect of the membrane that constitutes the expansion and contraction body. The present invention provides a pressure feeding device that solves the above-mentioned problems by devising the shape of the membrane constituting the expansion and contraction body.

FIG. 1 and FIG. 2 show two state diagrams of the pressurized fluid according to an example of the present invention during a discharge process and a suction process, respectively.

An inflatable body 2 having a bellows-like cross section is attached to the end face plate 5 of the container 1 with a presser fitting 4, and the other end is closed with a lid 11 by the presser fitting 4, and the middle part is in the bellows shape of the expandable body 2. The expansion and contraction portion is characterized by a structure in which retaining rings 3 are appropriately arranged to maintain the temperature.

With this configuration, the inside of the container 1 is divided into a driving fluid chamber 9 and a pressurized fluid chamber 1.
Form into two parts with 0.

By inflowing the driving fluid from the driving fluid inlet 6 attached to the end face plate 5, the bellows-shaped expansion/contraction body 2 expands (in the direction of the arrow in FIG. 1). At this time, the discharge valve 8 is in the open state, By keeping the suction valve 7 in the closed state, the fluid in the pressurized fluid chamber 10 is loaded with a pumping force and enters the discharge state.

On the other hand, as shown in FIG. 2, by flowing out the driving fluid from the driving fluid inlet 6, the bellows-shaped expansion and contraction body 2 contracts (
(in the direction of the arrow in Fig. 2), at this time the discharge valve 8 is closed, and the suction valve 7
By keeping the container open, new fluid to be pumped under pressure is drawn into the container.

By repeating this operation, it becomes possible to sequentially pump the fluid to be pumped.

(Effect of the invention) Since the cross section of the inflatable body has a bellows-like structure, which is the key point of the present invention, even when the inflatable body expands and contracts, no elastic displacement occurs in the constituent membrane itself of the inflatable body. , it becomes possible to respond by changing the geometric shape, which makes it possible to eliminate restrictions on the membrane displacement rate that take membrane life into consideration. The size of the pump can be reduced by almost half, and the entire pumping device can also be made extremely compact and lightweight.

[Brief explanation of drawings]

FIG. 1 shows a state diagram during the discharge process by the pumping device of the present invention, and FIG. 2 similarly shows a state diagram during the suction process. FIGS. 3 and 4 show conventional examples of similar applications. 1... Container 2... Bellows-shaped expansion and contraction body 3.
... Retaining ring 4 ... Presser foot 5 ... Short face plate 6 ... Drive fluid inlet 7 ... Suction valve 9 ... Drive fluid chamber 11 ... Lid 13 ... Membrane expansion Contraction body 8...discharge valve 10...pressurized fluid chamber 12...expansion/contraction body 14...mediate fluid chamber

Claims (1)

[Claims] In a pressurizing device that can expand and contract an inflatable body by flowing a driving fluid into and out of a driving fluid chamber, and can indirectly force the fluid to be pressurized in a pressurized fluid chamber to the outside, the cross section of the inflatable body is shaped like a bellows. A pressure feeding device characterized by: