JPH0849656A - Spiral type tube pump - Google Patents

Abstract

PURPOSE:To apply a stable boosted or decreased pressure on a work in a pump simultaneously with the forced feed of a work. CONSTITUTION:A cylinder body 1 is provided, and a guide groove 1a formed in a spiral shape and changing a pitch 5 at every one round is formed in the inner side surface of the cylindrical body 1. A resilient tube 2 having a specified length is spirally wound around the guide groove 1a. A drive shaft 3 is rotatably supported on the axis of the cylindrical body 1 at the two ends thereof on a drive shaft 3 and through, for example, a bearing. Three rollers 4 are supported at the same specified pitch as each other in parallel to and on the same periphery as that of the drive shaft 3 through a support member. Further, a resilient tube 2 having length enough to allow spanning between one end and the other end of the 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. 3 is a schematic diagram of a conventional tube pump, and FIG. 4 is a schematic diagram of a cylinder type pump.

In the conventional tube pump, as shown in FIG. 3, a rotation support portion 102 that supports three rollers 101 on the same circumference at a constant pitch (60 °), and a rotation support portion 102 rotates. 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 formed, 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 cylinder. 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. 3, 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. 4, 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 direction of rising and stays in the discharge force that discharges 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 achieve the purpose of pressurization, but because of the structure of the cylinder pump, suction and discharge cannot be performed at the same time and must be performed alternately, so the work in the flow path pulsates. 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 that contains 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 the bubbles that grow rapidly under normal pressure can be connected to the cleaning effect, or degassing of 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. It is an object to provide a spiral tube pump that can be removed by applying it.

[0013]

In order to achieve the above object, the spiral tube pump of the present invention is an elastic tube which is spirally installed along the inner surface of a cylindrical main body so that pitches of one winding are different from each other. A tube, a plurality of pump rollers inside the cylindrical body, arranged parallel to the axis of the cylindrical body and on the same circumference at a constant pitch, and crushing the elastic tube; And a drive shaft for simultaneously rotating the pump roller of (1) about the axis of the cylindrical body.

Further, in the above-mentioned spiral tube pump, a guide groove that matches the elastic tube is provided on an inner surface of the cylindrical main body in accordance with a desired spiral pitch.

[0015]

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, a space (hereinafter referred to as "pump chamber") sealed by two adjacent pump rollers in the elastic tube. ) Are formed, and the volumes of the pump chambers at this time are different in size. This means that if 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 becomes long, 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 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 enlarged along with the movement of the pump roller by the drive shaft, the volume of the work (contents) is expanded in the pump at the same time as the pumping. It is possible to apply the reduced pressure by the amount. On the contrary, 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 held in the increased or reduced pressure 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.

[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.

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.

On the axis of the cylindrical main body 1, a drive shaft 3 is rotatably supported at both ends thereof with the main body 1 via bearings, for example.

As shown in FIGS. 1 and 2, the drive shaft 3 is parallel to the drive shaft 3 and has a fixed pitch (60 °) on the same circumference with three pump rollers 4 interposed therebetween. ) 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 wound spirally around the inner wall surface of the cylindrical main body 1 is reduced from the right to the left in FIG. In the direction of arrow a (Figs. 1 and 2)
(See), 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 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 reduced change of the pump chamber 6 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 rate of change in pressure reduction at this time is directly proportional to the rate of change in the spiral pitch of the elastic tube 2 from small to large.

In this embodiment as described above, 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.

In the present invention, when the pressure increasing rate and the pressure reducing rate of the 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. It is not preferable that the elastic tube 2 is displaced and the spiral pitch is changed.

Therefore, at this time, as shown in FIG.
A guide groove 1a matching the tube diameter is previously provided on the inner wall surface of the cylindrical main body 1 in a desired spiral pitch shape,
By holding the elastic tube 2 in the guide groove 1a, the spiral shape of the elastic tube 2 can be stabilized.

[0034]

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, which are 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-liquid mixture or the gas-solid / liquid mixture gas can be refined and degassed at the same time as the liquid feeding operation without providing a separate device, thus saving labor.

According to the second aspect of the present invention, in addition to the above effects, by providing a guide groove on the inner peripheral surface of the cylindrical main body, the guide groove matching the desired spiral pitch elastic tube. The desired spiral pitch can be stabilized and maintained without the elastic tube shifting.

[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.

FIG. 3 is a schematic view of a conventional tube pump.

FIG. 4 is a schematic view of a cylinder type pump.

[Explanation of symbols]

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

Claims (2)

[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 about an axis of the cylindrical body. 2. The spiral tube according to claim 1, wherein a guide groove that matches the elastic tube is provided on an inner surface of the cylindrical main body so as to match a desired spiral pitch. pump.