JPS61291788A - Pulsating pump elastic contractive body - Google Patents

Abstract

PURPOSE:To make the whole pump apparatus compact even with a low output operating pressure source for operating fully a pump while lightening the appara tus itself, by using an elastic contractive body deformed to expand the diameter by the supply and drain of pressurized fluid and produce the axial contractive force. CONSTITUTION:End walls 22a, 22b spaced from each other are provided on a pump frame and a pressure plate 26 is disposed slidably between the end walls. Further, between this pressure plate 26 and the respective end walls 22a, 22b are mounted elastic contractive bodies 28a, 28b deformed to expand the diameter by the supply and drain of pressurized fluid and be contracted axially. Further, between the pressure plate 26 and the respective end walls 22a, 22b are respectively disposed bag-like expansible members 44a, 44b. And pressurized fluid such as air is alternatively supplied to and drained from the elastic contractive bodies 28a, 28b to slide the pressure plate 26 for permitting the pumping action of contractive members 44a, 44b.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a pump using an elastic contracting body that expands and deforms in diameter by supplying pressurized fluid and generates a contractile force in the axial direction. This is about a pump that runs on a cliff.

(Prior art and its problems) Various types of pumps for pumping liquid are known. For example, there is a pump shown in FIG. 3(a) that pumps liquid intermittently. . This pump is
Compressed air is alternately supplied to each chamber 3.4 divided into two by a piston 2 slidably disposed in the cylinder l, causing the piston 2 to reciprocate in the axial direction, and the piston fixed to the piston The rod 5 extends and compresses the telescopic bellows 6, and the liquid sucked from the suction lower is delivered to the discharge port 8.
It is pumped from

Note that reference numerals 9 and 10 indicate check valves provided at the suction lower and discharge ports 8, respectively.

Therefore, the cylinder was required to have a wall thickness sufficient to withstand the pressure of compressed air supplied and discharged, dimensional accuracy to allow sliding of the piston, and wear resistance. On the other hand, the piston also needed to have sufficient strength and wear resistance so that it could slide inside the cylinder without being deformed by the compressed air.

For this reason, a pump equipped with a cylinder of a certain wall thickness that allows the piston to move without being deformed by external forces, and a piston with sufficient strength, inevitably increases in weight and occupies less space. The problem was that it was growing. In addition, there is energy loss due to the sliding resistance of the piston seal provided on the outer periphery of the piston, operational problems due to stake slip at low speeds caused by this sliding resistance, and leakage of compressed air at the seal. There are manufacturing and cost problems due to processing accuracy.

On the other hand, as shown in FIG. 3(b), each check valve 9
．． Elastic tube 1 equipped with a suction port and a discharge port having 10
1 is installed in the frame chamber 12, and the chamber 12
There is also a pump that pumps liquid by supplying and discharging compressed air from the supply and discharge port 13 of the pump. This type of pump can reduce the weight of the pump itself, and there are no problems caused by sliding resistance. The problem is that air consumption is large and efficiency is low.

An object of the present invention is to provide a pump that does not have the above-mentioned drawbacks and uses an air bag type elastic contracting body that expands and deforms in diameter by supplying and discharging pressurized fluid and generates a contracting force in the axial direction.

(Means for Solving the Problems) To achieve this object, the pulsating pump of the present invention substantially divides the internal space of the frame into two parts having mutually spaced end walls.
The pressure plates that separate the parts are attached slidably in the direction of the end walls,
A set of at least two elastic contracting bodies that expand and deform in diameter by supplying and discharging pressurized fluid and generate a contractile force in the axial direction are arranged facing each other with the pressure plate interposed therebetween, and each elastic contracting body is One end is fixed to the end wall and the other end is fixed to the pressure plate, and a suction port and a discharge port made of rubber or rubber-like elastic material and provided with a check valve are provided in each internal space divided into two by the pressure. A part of each bag-like member is connected to a frame and a pressure plate, and pressurized fluid is alternately supplied and discharged to each of the opposing elastic contractile bodies by a pressurized fluid supply and discharge means. .

(Function) When compressed air is supplied to one elastic contraction body and the compressed air is discharged from the other elastic contraction body using the pressurized fluid supply/discharge means, the elastic contraction body receiving the compressed air expands in diameter. deformed,
Contracts in the axial direction. On the other hand, the elastic contractible body from which the compressed air has been discharged contracts in diameter and expands in the axial direction. By the way, one end of these elastic contracting bodies is fixed to the end wall of the frame, and the other ends are connected to each other via a pressure plate, so that the pressure plate is compressed by the contraction force of the elastic contracting body that performs a contraction movement. Move toward the end wall to which one end of the elastic contractile body is fixed. Therefore, the bladder-like telescopic member, which is connected in part to the relatively close pressure plate and, for example, to the end wall of the frame, is compressed, and the liquid contained therein is pumped through the outlet. It will be forced outward. Note that since the suction port is provided with a check valve that prevents the liquid from flowing out through the suction port, the liquid within the elastic member is always discharged from the discharge port. On the other hand, another telescoping member connected to the other end wall of the frame and the pressure plate expands in response to the movement of the pressure plate, and the liquid flows through the suction port into this bag-shaped expansion and contraction member. It is sucked into the member. Note that since the discharge port is provided with a check valve, the discharged liquid will not flow back into the elastic member through the discharge port.

Next, the supply/discharge means discharges the compressed air from the elastic contracting body supplied with compressed air and supplies the compressed air to the other elastic contracting body, the other elastic contracting body expands in diameter and contracts, and the one elastic The contractile body expands.

Therefore, the pressure plate moves in the opposite direction, i.e. towards the end wall on the side receiving the supply of compressed air, and presses the telescopic member disposed between the end wall and the pressure plate and containing the liquid. .

Therefore, the liquid within the expandable member is pumped out from its discharge port in response to the movement of the pressure plate. On the other hand, the middle 4 members related to the elastic contracting body that expands are partially connected to the end wall of the frame, so they expand in response to the movement of the pressure plate, and draw liquid into the interior from the suction port. Inhale. Note that check valves are provided at the inlet and outlet ports of each expandable member, so that liquid will not flow backwards.

In this manner, the fluid can be pumped by supplying and discharging means by alternately supplying compressed air to each elastic contractile body.

The pulsating pump of the present invention will be described in detail below with reference to the drawings.

(Example) FIG. 2(a) is a perspective view showing a pulsating pump of the present invention. In addition, for the sake of brevity, the reference numeral 2 is shown with some parts omitted.
0 indicates a frame, and the frame 20 includes an end wall 22a,
22b, and a guide rod 24 for holding the end walls apart. In this embodiment, a guide rod is used to keep the other walls apart, but the guide rod is not limited to this. A pressure plate 26 provided on the outer peripheral edge with engagement slots 26a (see FIG. 1(b)) that engage these guide rods 24 is attached to the end wall 22a.

22b to divide the internal space of the frame 20 into two and to allow the frame 20 to slide freely in the longitudinal direction between these end walls. Preferably, a resin film having low sliding resistance, such as polytetrafluoroethylene, is formed on the inner peripheral surface of the engaging slot 26a to reduce the sliding resistance of the pressure plate 26.

The respective end walls 22a, 22b of the frame 20 and the pressure plate 26 are connected via at least two elastic contraction bodies 28a, 28b (in this embodiment, a set of eight elastic contraction bodies 28a, 28b).

This elastic contracting body is shown in FIG.
It is advantageous to use an airbag type as shown in publication No. 40378. In the figure, 30 is a tubular body;
2 is a braided reinforcement structure covering the outer periphery, 34 is a closing member at both ends, and 36 is a caulking cap.

The tubular body 30 is preferably made of rubber or a rubber-like elastic material because of its air impermeability and flexibility, but it may be replaced with an equivalent material such as a plastic material.

The braided reinforcement structure 32 has a braided structure that reaches a so-called rest angle (54° 44') when the tubular body 30 is expanded to its maximum diameter due to internal pressure filling, and is made of organic or inorganic high-tensile fibers, such as aromatic fibers. Group polyamide fibers (Kevlar: trade name) and twisted or untwisted bundles of filaments such as ultrafine metal wires are suitable.

One of the closing members 34 includes an internal cavity 30a of the tubular body 30.
A connecting hole 40 communicating with the connecting hole 40 is formed, and a finting 42 is attached through this connecting hole. The finning 42 is connected to an operating pressure source, such as an air compressor (
(not shown) into the internal cavity 30 of the tubular body 30.
By connecting a conduit applied to a and applying a controlled pressure within the internal cavity 30a, the expansion diameter of the tubular body 30 and the axis derived therefrom are increased by expanding the braid angle of the braided reinforcing structure 32, that is, by pantograph movement. directional contraction, ie a reduction in the distance between the closure members 34.

Further, reference numeral 36 indicates the tubular body 30 and the braided reinforcement structure 32.
and the closing member 34, and reference numeral 38a denotes a screw provided on one of the closing members 34 in order to screw and secure one end of the elastic contractile body to the pressure plate 26. Department. Note that the end wall 22a of the frame 20,
The fixation of each elastic contraction body to the other closure member 34
The connection is made using the connection bottle hole 38b formed in .

Next, in the internal space of the frame 20 divided into two by the pressure plate 26, for example, bag-shaped extensible members 44a and 44b made of rubber or a rubber-like elastic material are arranged. As shown in FIGS. 1(b) and 3, these extensible members 44a, 44b have engaging protrusions 46 that partially protrude from the flat surface of the pressure plate 26 facing the end walls 22a, 22b. They are fitted into the respective groove holes 46a and 46b and connected, and furthermore, other parts, more specifically, check valves 9a+9b, respectively.
, 10a, 10b are connected to the end walls 22a, 22b via a retaining ring 48, respectively.
connected to. Therefore, these elastic members 44a and 44b, which are highly flexible, expand and contract in response to the movement of the pressure plate 26 in the axial direction, and when the pressure plate 26 moves away from the end wall, the suction lower When the pressure plate 26 moves close to the end wall, the liquid sucked into the interior is discharged outward from the discharge port 8.

On the other hand, each elastic contractile body 28a that drives the pressure plate 26,
28b is connected to a conduit 54 through which compressed air is sent from an operating pressure source 52 into the internal cavity of the elastic contracting body through fittings 42 provided respectively. A supply/discharge means 50 for alternately supplying and discharging compressed air to each pair of elastic contracting bodies is connected in the middle of the pipe line 54, and the pressure of the compressed air and the switching speed of the compressed air can be changed as appropriate. Adjust the operation of the pump.

This situation will be explained using FIG. 3. The supply/discharge means 50 supplies compressed air from the operating pressure source 52 to the elastic contracting body 28b via the conduit 54, and discharges the compressed air inside the elastic contracting body 28a. As a result, the elastic contraction body 28b expands in diameter and contracts in the axial direction, and the elastic contraction body 28a contracts in diameter and extends in the axial direction, so the pressure plate 26 moves in the direction indicated by arrow A in the figure. As a result, the telescoping member 44a on the end wall 22a side expands and draws liquid into its interior from the associated suction lower.

In contrast, the elastic member 44b on the end wall 22b side contracts,
The liquid inside is discharged from the associated discharge port 8.

As clearly shown in FIG. 1(a), the pulsating pump of the present invention is arranged between the end walls 22a and 22b, and the pressure plate 2
Remove the stay 56 that also functions as a guide for 6,
The bag-shaped member is removed by pulling out the retaining ring 48 along the radially extending slot 58 formed in each end wall 22a, 22b, and disengaging the elastic member 44a, 44b from the engaging protrusion 46. Since it can be easily replaced, the expandable member can be appropriately selected according to the liquid to be pumped, and maintenance and inspection are easy. In addition, Fig. 1 (b
), it is preferable to cover the entire pump, including the elastic contraction body, with a cover 60 to prevent the elastic contraction body and the pressure plate from being damaged or contaminated.

(Effects of the Invention) As detailed above, the pulsating pump of the present invention uses an air bag type elastic contracting body that expands and deforms in diameter by supplying and discharging pressurized fluid and generates a contractile force in the axial direction. Since the pressure plate is pressed and the liquid is pumped, the weight of the device itself can be reduced compared to a pump using a cylinder piston, and there is no leakage of pressurized fluid at the sliding part of the cylinder piston. Also, since there is no problem of energy loss due to sliding resistance, the energy of the pressurized fluid can be used effectively. Moreover, since the elastic contractile body has a larger output than a cylinder-piston device of the same diameter, the pump can function sufficiently even with a low-output operating pressure source, making it possible to downsize the entire pump device. Become.

[Brief explanation of the drawing]

FIG. 1(a) is a perspective view showing a pulsating pump of the present invention with some parts omitted, and FIG. 1(b) is a sectional view taken from the direction of arrow 1-1 in FIG. 1(a). , FIG. 2 is a partially sectional front view of an airbag type elastic contracting body suitable for the present invention, and FIG.
Figures 4(a) and 4(b) are route maps showing known pulsation pumps, respectively. 1...Cylinder 2...Piston 3.4.
... Chamber 5 ... Piston rod 6 ... Bellows 7 ... Suction port 8 ... Discharge port 9, 9a, 10.10a - Check valve 11 ... Elastic tube 12 ... Frame chamber 13... Feed port 20... Frame 22a, 22b... End wall 24... Guide rod 26... Pressure plate 26a... Engagement slot 28a, 28b... Elastic contraction body 44a, 4
4b... Telescopic member 46... Engaging protrusion 46
a, 46b...engaging protrusion 48...retaining ring
50...Merge means 52...Operating pressure source
54... Conduit 56... Stay 58...
・Slot hole 60...Cover Fig. 2 Fig. 4 (a) (b)

Claims (1)

[Claims] 1. A frame having end walls that are spaced apart from each other, a pressure plate that is slidably attached to the frame in the direction of the end walls and substantially divides the internal space of the frame into two, and is arranged to face each other with the pressure plate interposed therebetween. A set of at least two elastic contracting bodies, each having one end fixed to the end wall and the other end fixed to the pressure plate, which expands and deforms in diameter by supplying and discharging pressurized fluid to generate a contractile force in the axial direction; A bag-shaped bag made of rubber or rubber-like elastic material is arranged in an internal space divided into two by a plate, has a suction port and a discharge port each provided with a check valve, and is connected to the frame and the pressure plate. 1. A pulsating pump using elastic contracting bodies, comprising an elastic member and supply/discharge means for alternately supplying and discharging pressurized fluid to and from each elastic contractible body.