JPH0849657A - Spiral type tube pump - Google Patents

Abstract

PURPOSE:To apply a stable boosted and decreased pressure on a work in a pump simultaneously with the continuously forced feed of a work. CONSTITUTION:A spiral type tube pump is provided with a cylindrical body 1 and a guide groove 1a formed in a spiral state and changing a pitch 5 at every one round is formed on the inner side surface of the cylindrical body 1, and a resilient tube 2 is spirally wound around the guide groove 1a. A protrusion part 2a matched with the guide groove 1a is formed on the outer peripheral surface of the resilient tube 2 in a slow twisting manner in conformity with the guide groove 1a. A drive shaft 3 is rotatably supported on the axis of the cylindrical body 1 at the two ends on the body l through, for example, bearings. Three pump rollers 4 are supported by the drive shaft 3 in parallel to the drive shaft 2 and on the same periphery and the same specified pith as each other. A resilient tube 2 is pressed by each pump roller 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a spiral tube pump applicable to pressure-feeding of a liquid mixture with bubble compression / dissolution and pressure-feeding of gas / solid / liquid mixture with high density of solid-liquid.

[0002]

2. Description of the Related Art Conventionally, tube pumps, cylinder type pumps, etc. have been known as pumps capable of pumping a work such as a gas / liquid mixture or a gas / solid / liquid mixture.

FIG. 6 is a schematic diagram of a conventional tube pump, and FIG. 7 is a schematic diagram of a cylinder type pump.

In the conventional tube pump, as shown in FIG. 6, a rotation support portion 102 for supporting three rollers 101 on the same circumference at a constant pitch (60 °), and a rotation support portion 102 being rotated. And an elastic tube 103 which is a flow path and is pressed against each roller 101. The pump chamber 104 having a constant volume, which is sandwiched between two adjacent rollers 101, is fixed to the rotation support portion 102.
By moving along with the rotation in the direction of the arrow
The work in the elastic tube 103 can be pressure-fed from the suction side to the discharge side.

The cylinder type pump has a first cylinder 105 and a second cylinder 10 as shown in FIG.
6 are integrally configured, and suction ports 108a and 108b for sucking the work in the cylinder chamber and discharge ports 107a and 107b for discharging the work in the cylinder chamber are provided in each of the suction ports. The valves 108a and 108b and the discharge ports 107a and 107b can be opened and closed by valves. Further, a branch end formed by branching one flow path pipe 109 into two is connected to each of the discharge ports 107a and 107b.

In the cylinder type pump, the first cylinder 105 and the second cylinder 106 are alternately driven, so that the work is pressure-fed through the flow passage pipe 109. That is, when the work in the first cylinder 105 is being discharged, the valve of the second discharge port 107b is closed and the second suction port 108b is inserted into the second cylinder 106.
The work is further sucked, then the valve of the first discharge port 107a is closed and the valve of the second discharge port 107b is opened, and the work in the second cylinder is discharged. By alternately switching the suction and the discharge with the two cylinders in this manner, the work can be pressure-fed through the flow path pipe 109.

[0007]

However, in the above-mentioned conventional tube pump and cylinder type pump, only the work is pressure-fed, and the work cannot be pressurized or depressurized in the pump.

That is, in the tube pump shown in FIG. 6, the pitch (60 °) between the rollers for feeding the work under pressure.
Is fixed, the space volume in the pump chamber, which is sandwiched between two adjacent rollers, is constantly constant,
Therefore, the internal pressure of the pump chamber is constant and cannot be varied.

In the cylinder type pump shown in FIG. 7, since the volume inside the cylinder changes due to the movement of the piston, the internal pressure of the cylinder certainly changes in the ascending direction.
Originally, at this time, the valve of the discharge port of the cylinder is opened at the same time as the piston moves forward, so the internal pressure in the cylinder does not work in the upward direction and does not work toward the discharge force to discharge the work in the cylinder. Since it is converted, the work itself does not basically maintain a stable pressure.

If the pressure on the work is to be increased, the work to be increased in pressure should be kept in the flow path pipe connected to the cylinder discharge port, and the work should be discharged from the cylinder. It is not impossible to say that the purpose of pressurization can be achieved, but because of the structure of the cylinder pump, suction and discharge cannot be performed at the same time, and they must be performed alternately. Forced to obtain stable pressure is difficult.

Further, since it has the above-mentioned problems, only the conventional tube pump or cylinder type pump can be used for cleaning the air bubbles of an object with a gas / liquid mixture, for example, an inert gas atomized under heavy pressure. The cleaning liquid containing the air bubbles is sprayed into the atmospheric water tank and sprayed on the object to be cleaned, and the cleaning liquid diffusion action of bubbles that grow rapidly under normal pressure is connected to the cleaning effect, or the degassing of a gas-solid-liquid mixture. It is not possible to operate, for example, to increase the density by separating solid / liquid and gas by gradually increasing the pressure while transporting the edible paste product, and a separate device is required for these operations. there were.

In view of the above-mentioned problems of the prior art, the present invention continuously pumps a work such as a gas / liquid mixture or a gas / solid / liquid mixture, and at the same time, a stable pressure increase or depressurization to the work in the pump. An object is to provide a spiral tube pump that can be applied.

[0013]

In order to achieve the above object, the present invention provides an elastic tube arranged in a spiral shape along the inner surface of a cylindrical main body so that pitches of one winding are different from each other, and the cylinder. A plurality of pump rollers arranged inside the cylindrical body in parallel to the axis of the cylindrical body and on the same circumference at a constant pitch, crushing the elastic tube, and the plurality of pump rollers. A spiral tube pump having at least a drive shaft for simultaneously rotating about an axis of a cylindrical body, wherein a guide groove is provided on an inner surface of the cylindrical body in accordance with a desired spiral pitch. A protruding portion that matches the guide groove is provided on the outer peripheral surface of the elastic tube in a gentle twist shape.

[0014]

According to the present invention constructed as described above, the elastic tubes arranged spirally along the inner surface of the cylindrical body at different pitches of one winding are arranged parallel to the axis of the cylindrical body. In addition, since it is crushed by a plurality of pump rollers arranged at a constant pitch on the same circumference, the space inside the elastic tube is closed by two adjacent pump rollers (hereinafter referred to as "pump chamber"). .) Are formed, and the volumes of the pump chambers at this time are different in size. This is because if the pitch of each winding of the spirally wound tube in the same cylinder is changed, the winding length for each winding is different, and when the winding pitch is large, the winding length becomes longer, This is because the lap length becomes short when the pitch of one winding is small.

When a plurality of pump rollers are simultaneously rotated about the axis of the cylindrical main body by the drive shaft in such a state, the plurality of pump rollers move while continuously crushing the elastic tube. The volume of the chamber changes in proportion to the spiral pitch of the elastic tube.

Therefore, if the spiral pitch is set so that the volume of the pump chamber in the hermetically sealed state is expanded along with the movement of the pump roller by the drive shaft, the volume of the work (content) is expanded in the pump at the same time as the pumping. It is possible to apply the reduced pressure by the amount. Conversely, if the spiral pitch is set so as to be reduced, it is possible to increase the pressure in the pump by the volume reduction change.

As a result, the work such as the gas / liquid mixture or the gas / solid / liquid mixture can be pressure-fed while being maintained in the increased or reduced pressure state for a certain period of time.
It is possible to perform gas degassing operation or atomizing operation on the mixture at the same time as pumping in the pump.

Further, when the pump is in operation, the pump roller moves while crushing the elastic tube. At this time, a guide groove is provided on the inner surface of the cylindrical body in accordance with the intended spiral pitch, and the guide groove is provided. Since the protrusion that matches the groove is provided on the outer peripheral surface of the elastic tube in a gentle twist shape, the elastic tube maintains the desired spiral pitch without being displaced by the pressure rotation of the pump roller. Therefore, it is possible to stably apply the target pressure to the workpiece to be pumped.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical sectional view best showing the features of one embodiment of the spiral tube pump of the present invention, and FIG. 2 shows the related states of the elastic tube, pump roller and drive shaft shown in FIG. FIG. 3 is a general view of the elastic tube shown in FIG. 1, and FIG. 4 is a sectional view taken along the line AA of FIG.

As shown in FIG. 1, the spiral tube pump according to the present embodiment is provided with a cylindrical main body 1, and the inner surface of the cylindrical main body 1 is a spiral guide with a pitch 5 changed every revolution. A groove 1a is provided, and an elastic tube 2 having a constant length is spirally wound around the guide groove 1a.

As shown in FIGS. 3 and 4, the outer peripheral surface of the elastic tube 2 is provided with a protrusion 2a which fits the guide groove 1a in a gentle twist shape in conformity with the spiral guide groove 1a. There is.

In FIG. 1, the drive shaft 3 is rotatably supported on the axis of the cylindrical main body 1 at both ends thereof via the main body 1 and bearings, for example.

As shown in FIG. 1 and FIG. 2, the drive shaft 3 has three pump rollers 4 via a support member in parallel with the drive shaft 3 and on the same circumference at a constant pitch (60 °). ) Is supported. Then, each pump roller 4 presses the elastic tube 2 with a sufficient length so as to straddle the elastic tube 2 from one end to the other end. As a result, the pump chamber 6 is formed by being sandwiched between the two adjacent pump rollers 4.

Generally, when the pitch of each spirally wound tube in the same cylinder is changed, the winding length for each winding is different, and when the winding pitch is large, the winding length is long. Therefore, when the pitch of one winding is small, the lap length becomes short.

Therefore, when such a tube having a different pitch for each winding is crushed by the pump rollers 4 arranged at a constant pitch on the same circumference as shown in FIGS. 1 and 2, two tubes are obtained. The space volume of the pump chamber 6 formed between the pump rollers also differs in size.

Needless to say, the elastic tube 1 has a restoring force that immediately returns to a hollow state when the pressure applied by the pump roller 4 disappears. Further, in the present embodiment, the case where the number of pump rollers 4 is three is shown, but the number is not limited to this.

Next, the operation of this embodiment will be described.

In FIG. 1, when the spiral pitch 5 of the elastic tube 2 spirally wound around the inner wall surface of the cylindrical body 1 is reduced from the right side to the left side in FIG. In the direction of arrow a (Figs. 1 and 2)
Rotation), the pump chamber 6 of the elastic tube 2 formed between the two adjacent pump rollers 4 also moves along the spiral shape of the elastic tube 2, but the spiral pitch 5 of the elastic tube 2 Changes from large to small, the space volume of the pump chamber 6 also moves proportionally to it from small to small. At this time, since the pump chamber 6 is sealed by the two pump rollers 4 at the front and rear, there is no escape place for the work such as the gas / liquid mixture or the gas / solid / liquid mixture to be pressure-fed, and only the change amount of the pump chamber 6 is reduced. The internal pressure of the pump chamber 6 will continue to rise.

On the other hand, when the rotation of the drive shaft 3 is switched in the opposite arrow b direction (see FIGS. 1 and 2), the elastic tube 2 has a spiral shape, so the pump roller 4
The direction of movement of the pump chamber 6 induced by is reversed and the internal pressure also tends to decrease from increased pressure.

Needless to say, the change rate of the reduced pressure at this time is directly proportional to the change rate of the spiral pitch of the elastic tube 2 from small to large.

In this embodiment, since the work is moved in a state where the pump chamber is sealed by the two adjacent pipe rollers, the work is moved to the work in the elastic tube of the variable spiral pitch for a certain time in the pump. The pressure applied state can be maintained stably. Therefore, for example, in the case of a bubble cleaning operation of an object with a gas / liquid mixture or a degassing operation of a gas / solid / liquid mixture, it can be performed simultaneously with the pressure feeding of the work without providing another device.
The operation process is simplified and labor is saved.

When the pressure increasing rate and the pressure reducing rate of such a spiral tube pump are made constant, the change rate of the spiral pitch is made constant, so that it is not only necessary to maintain the spiral shape of the elastic tube 2, but also It is not preferable that the elastic tube 2 is displaced and the spiral pitch is changed.

However, since the tube used in an ordinary tube pump has a simple circular cross section, when it is used in a spiral tube pump, it is installed spirally along the inner surface of the cylindrical body 1. There is concern about the stability of the elastic tube at the time of doing, and the spiral pitch may move due to the rotational pressure of the pump roller 4.

Therefore, in this embodiment, in order to prevent the instability of the spiral winding of the elastic tube 2, FIG.
As shown in FIG. 2, a protrusion 2a is provided on a portion of the outer peripheral surface of the elastic tube 2 that contacts the inner surface of the cylindrical main body 1,
Further, a guide groove 1a matching the shape of the protrusion 2a is provided on the inner surface of the cylindrical main body 1 in a desired spiral shape, and the protrusion 2a is fitted into the guide groove 1a to fix the elastic tube 2 to operate the pump. Pump roller 4
The displacement of the elastic tube 2 due to the rotational pressurization is prevented.

When the elastic tube 2 is spirally wound along the inner surface of the cylindrical main body 1, the contact portion of the elastic tube 2 with the cylindrical main body 1 is loose on the outer peripheral surface of the elastic tube 2. Draw a twisted line. Therefore, the projection 2a of the elastic tube 2 applied to the spiral tube pump of this embodiment also draws a gentle twisted spiral as shown in FIG.

FIG. 5 shows how the elastic tube as described above is crushed by the pump roller.

As shown in FIG. 5A, the protrusion 2a of the elastic tube 2 is fitted in the guide groove 1a of the cylindrical main body 1, so that the elastic tube 2 is fixed to the inner surface of the cylindrical main body 1. Therefore, even if the elastic tube is crushed as shown in FIG. 5B, the protrusion 2 does not become flat as in the case of a circular cross section and does not come off the guide groove 1a.
The state of being fitted in the guide groove 1a at a is maintained. Therefore,
The elastic tube 2 is not displaced by the rotational pressing of the pump roller 4, and the target spiral pitch, and thus the target pressure increase rate and pressure decrease rate, can be stabilized and maintained.

[0039]

Since the present invention is configured as described above, it has the following effects.

According to the first aspect of the present invention, elastic tubes having a variable spiral pitch arranged along the inner peripheral surface of the cylindrical body are arranged parallel to the axis of the cylindrical body and on the same circumference. By crushing with multiple pump rollers arranged at a pitch and enabling multiple pump rollers to rotate simultaneously around the axis of the cylindrical body, the work inside the pump can be pressurized or depressurized. It is possible to perform pressure feeding while holding for a certain period of time.
As a result, the gas refining operation and the deaeration operation of the gas / liquid mixture or the gas / solid / liquid mixture can be performed at the same time as the liquid feeding operation without providing a separate device, thus saving labor.

Further, a protrusion is provided on a portion of the outer peripheral surface of the elastic tube which comes into contact with the inner surface of the cylindrical body, and a guide groove matching the shape of the protrusion is formed on the inner surface of the cylindrical body in a spiral shape. By providing a protrusion on this guide groove and fixing the elastic tube, it is possible to stabilize and maintain the desired spiral pitch without the elastic tube shifting due to rotational pressing of the pump roller during pump operation. .

[Brief description of drawings]

FIG. 1 is a vertical sectional view best showing the features of one embodiment of the spiral tube pump of the present invention.

2 is a schematic diagram showing a related state of an elastic tube, a pump roller and a drive shaft shown in FIG. 1. FIG.

3 is an overall view of the elastic tube shown in FIG.

4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is a diagram showing a state in which an elastic tube is crushed by a pump roller.

FIG. 6 is a schematic view of a conventional tube pump.

FIG. 7 is a schematic view of a cylinder type pump.

[Explanation of symbols]

 1 Cylindrical main body 1a Guide groove 2 Elastic tube 2a Projection part 3 Drive shaft 4 Pump roller 5 Spiral pitch 6 Pump chamber

Claims (1)

[Claims] 1. An elastic tube spirally installed along an inner surface of a cylindrical body so that each winding has a different pitch, and an elastic tube disposed inside the cylindrical body and parallel to an axis of the cylindrical body. And are arranged at a constant pitch on the same circumference,
A spiral tube pump comprising at least a plurality of pump rollers crushing the elastic tube, and a drive shaft for simultaneously rotating the plurality of pump rollers around the axis of the cylindrical body, A guide groove is provided on the inner side surface of the cylindrical body in accordance with a desired spiral pitch, and a protrusion portion that matches the guide groove is provided on the outer peripheral surface of the elastic tube in a gentle twist shape. Spiral tube pump.