JPH0318708Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a positive displacement fluid transfer device, in particular, a rotor with an endless belt suspended in a housing is provided in a forcedly rotatable manner, and when the rotor rotates, an endless The present invention relates to a fluid transfer device configured such that a fluid suction chamber and a fluid discharge chamber are formed by a belt and an inner surface of a housing.

[Conventional technology]

Conventionally, roots blowers, movable vane compressors, and the like have been widely used as positive displacement compressors.

[Problem that the invention attempts to solve]

However, the above-mentioned conventional positive displacement compressors (1) have many sliding parts and require a lubricating device to prevent wear on the sliding parts; (2) the sliding parts are airtight; Because of the structure, the device structure is complicated and maintenance is troublesome, such as the need to prevent leaks using sealing liquid.

In addition, in order to reduce the amount of leakage by reducing the clearance between the casing and rotor and to eliminate sliding parts, a timing gear has been devised between the rotors, but the problem is that the structure is still complicated. The dot was hot.

The present invention was devised in view of the problems of the conventional devices described above, and an object of the present invention is to provide a positive displacement fluid transfer device with a simple structure in which the number of sliding parts is significantly reduced.

[Means for solving the problem] The present invention provides a rotor in which three rotor rolls are mounted radially around a forced rotation axis within a housing consisting of a rotor housing with a circular inner peripheral surface and a pair of side housings. are rotatably provided, a pair of opposing belt rolls are provided at opposing positions outside the circumference of the rotor housing, and a pair of opposing belt rolls communicating with the outside are provided at substantially symmetrical positions sandwiching these opposing belt rolls of the rotor housing. An endless belt having a substantially U-shaped cross section and made of a flexible material and having ears on both sides and forming an intake part and a pair of exhaust parts is hung over the rotor roll and the opposing belt roll, and is pressed into contact with the side housing. At the same time, the endless belt is clamped by the rotor roll and the inner peripheral surface of the rotor housing, and by the opposing belt roll, and when the rotor is rotated by the clamping pressure parts a and b, the inner peripheral surface of the rotor housing and the outer peripheral surface of the endless belt are pressed into the housing. A positive displacement fluid transfer device, characterized in that two fluid suction chambers and two fluid discharge chambers are formed by the inner surface of the side housing, respectively, at substantially symmetrical positions with respect to the center point of the forced rotation axis of the rotor. It is a device.

That is, the present invention provides a rotor in which three rotor rolls are attached radially around a forced rotation axis in a housing consisting of a rotor housing with a circular inner circumferential surface and a pair of side housings, and the circumference of the rotor housing is Opposing belt rolls are provided at each of the opposing positions on the outside, and openings communicating with the outside are formed at approximately symmetrical positions sandwiching these opposing belt rolls in the rotor housing, and a substantially U-shaped cross section made of a flexible material is provided. An endless belt of the shape of the shape is hung around the rotor roll and the opposing belt roll, and the endless belt is compressed by the rotor roll and the inner peripheral surface of the rotor housing and by the opposing belt roll, respectively, so that when the rotor rotates, the endless belt is compressed into the housing and the rotor housing. Two fluid suction chambers and two fluid discharge chambers are formed by the circumferential surface, the endless belt outer circumferential surface, and the inner surface of the side housing, respectively, at substantially point-symmetrical positions with respect to the center point of the forced rotation axis of the rotor. It is a positive displacement fluid transfer device.

〔Example〕

An example in which the present invention is applied to a compressor will be explained based on the drawings.The inner circumferential surface is smooth and finished to form most of a perfect circle (or almost circular), and the vertical cross-sectional shape is A housing 3 having a cylindrical internal space formed by a rectangular cylindrical rotor housing 1 and a pair of side housings 2, 2 whose inner surfaces are finished with a smooth planar shape.
A rotor 4 is provided therein for forced rotation.

This rotor 4 includes a forced rotation shaft 6 that passes through the center of the pair of side housings 2 and the center of the housing 3, and is supported by bearings 5 provided outside each side housing, and both ends of this rotation shaft. Two circular intermediate plates 7 are fixed in the vicinity of the intermediate plate, and each of these intermediate plates has a circular plate 7 arranged radially around the intermediate plate and spaced from each other at equal angular intervals (or approximately at equal angular intervals).
three plate-shaped arms 8 of equal length fixed with,
Arms 8, 8 facing each other in the axial direction of the rotating shaft 6
A support shaft 9 is provided across the support shaft, and three rotor rolls 10 are cylindrical and have the same diameter and length and are provided on this support shaft via bearings (not shown) and act as idle rolls. , 11 and 12.

The arm 8 is fixed to the intermediate plate 7 by inserting bolts into elongated holes (not shown) provided in both the arm and the intermediate plate 7. Therefore, the circumferential surface of each rotor roll and the rotor housing 1
It is possible to increase/decrease or finely adjust the size of the clearance between the rotor roll and the inner circumferential surface of the rotor housing 1. This makes it convenient for setting the clamping pressure to a desired value. The clearance between each side of each rotor roll and the inner surface of the side housing 2 is as follows:
It is set to a substantially uniform and constant value regardless of the rotational position of the rotor roll.

On the other hand, at each of the opposing positions (or almost opposing positions) outside the circumference of the rotor housing,
A pair of belt rolls 15 and 16 that are cylindrical, have the same length as the rotor roll, or are slightly shorter than the rotor roll, and have a diameter smaller than the rotor roll are disposed opposite each other. These two belt roll groups are both idle rolls, and constitute guide rolls that also serve to change the direction of the endless belt, guide the pinching movement, and seal the compression section. Further, these belt rolls 15 and 16 are connected to a pair of side housings 2 and 2, respectively, similar to the rotating shaft 6.
It is fixed to a support shaft (not shown) which passes through the housing and is supported by a bearing (not shown) provided outside the housing, and between the peripheral surfaces of the belt rolls 15 and 16 and each of these rolls. The clearance between the side surface and the inner surface of the side housing 2 is fixed at a constant value.

At symmetrical positions (or approximately symmetrical positions) sandwiching each belt roll group of the rotor housing 1 in FIG. , 24 are formed. That is, the intake part 2
1 is opened in a position symmetrical to the exhaust part 22, in a position symmetrical to the exhaust part 23 with respect to the center point of the rotating shaft 6, and in a position vertically symmetrical to the exhaust part 24.

Further, the rotor rolls 10 to 12 and each belt roll 16, 16 are provided with an endless belt made of a flexible material such as rubber and having a U-shaped cross section and having ears 31 on both sides in the width direction, as shown in FIG. 32 is hung under tension (however, the endless belt is omitted in FIG. 2). In this case, the endless belt 32 is
The ears 31 enclose a part of both side surfaces of each rotor roll 10 to 12 and a part of both sides of the belt roll 16, and on the outer surface side of this ear part there are projections to improve the sealing effect. 33 are provided in a plurality of rows (or in a scattered pattern). At the same time, this endless belt is formed by (1) the circumferential surface of each rotor roll and the inner circumferential surface of the rotor housing 1, and (2) the belt roll 1.
5 and 16, and (3) the side surfaces of each rotor roll and the inner surface of the side housing 2, pinch parts a, b, and c of the endless belt are formed in the housing 3, respectively, and in the pinch part c, the ear part 31 is being squeezed,
Each of these pinching parts acts as a sealing part due to the compressive deformation of the endless belt, and therefore,
The interior space of the housing 3 is partitioned into a plurality of compartments in a mutually sealed state by the respective clamping parts and the endless belt.

The clamping pressure of these clamping parts is caused by the rotor 4 being forcibly rotated, the rotor rolls 10 to 12 rolling on the endless belt 32, and the belt rolls 15 and 16 also rotating when the total length of the endless belt increases or decreases moment by moment. The tension is set so that the total tension of the endless belt is always uniform.

Therefore, when the rotor 4 is in the rotational position shown in FIG. A compartment formed by the endless belt 32, the rotor housing 1, and the pair of side housings 2, 2, and a compartment inside the endless belt 32, that is, the endless belt and the pair of side housings. In addition, in the upper half of the rotor housing in FIG.
It is divided into two compartments, one of which is a gas suction chamber and the other a compressed gas discharge chamber. Incidentally, which one becomes the suction chamber is determined by the rotational direction of the rotor 4, and this will be described later.

Therefore, when replacing the endless belt 32, remove the pair of side housings 2, 2,
After loosening the bolts (not shown) fixing the arm 8 to the intermediate plate 7 and moving each rotor roll toward the rotating shaft 6, each rotor roll and each belt roll 1 are removed.
6 and 16, and when hanging, just follow the reverse procedure.

In addition, 35 in FIG. 1 is a guide member for the endless belt, and the rotor 4 rotates and the rotor rolls 10 to 10 are guided.
12 rolls on the endless belt 32, and when the endless belt circulates at a slow speed, it smoothly guides the endless belt to the belt roll group, and also reduces the sliding width of the endless belt with respect to the inner surface of the side housing 2. This is intended to make the belt smaller and thus extend its lifespan, and at the same time to make the belt tension between the respective clamping parts more uniform, but this is not essential to the present invention.

Next, the operation of this embodiment will be explained based on FIGS. 4 to 6. The rotational position of the rotor 4 in FIG. 4 is the same as that in FIG. The changes from the state to the state shown in FIG. 5, through the state shown in FIG. 5, through the state shown in FIG. 6, and back to the state shown in FIG. 4, are as follows. Note that in each of the above figures, the lower half of the inner space of the housing 3 is separated from the upper half by the pinching portion b formed by the belt roll group, and the changes in the lower half are exactly the same as in the upper half, although there is a time lag. Therefore, I will only explain the top half.

Now, in FIG. 4, the compartment formed by the endless belt 32, the rotor housing 1, and the side housing 2 is divided into a suction chamber A and a discharge chamber B by the pinching part a of the rotor roll 10, and these chambers are the same. However, as the rotor 4 rotates and the rotor roll 10 rolls on the endless belt 32, the volume of the suction chamber A that communicates with the intake section 21 gradually increases, and the volume of the exhaust chamber A that communicates with the exhaust section 22 gradually increases. As a result of the volume of chamber B gradually decreasing, the inside of suction chamber A becomes a load and gas is sucked from the intake part 21, while the inside of discharge chamber B becomes pressurized and the compressed gas inside is discharged from the exhaust part 22. be done.

Eventually, when the state shown in FIG. 5 is reached, the volume of the suction chamber A reaches almost the maximum value, and the volume of the discharge chamber B becomes almost the minimum value. When the rotor 4 rotates further and reaches the state shown in FIG. The chamber A communicates with the exhaust section 22 and switches to the exhaust chamber B, and further rotation creates the suction chamber A that communicates with the intake section 21.

In this way, the rotation of the rotor 4, and therefore the rolling of the rotor rolls 10 to 12, causes (1) the generation of a suction chamber, (2) an increase in the suction chamber volume and a decrease in the discharge chamber volume,
(3) Disappearance of the discharge chamber and switching of the suction chamber to the discharge chamber,
(4) Gas is compressed and transferred while the cycle of suction chamber generation is repeated.

It should be noted that, as explained above, even when the rotor 4 is rotated clockwise, the pumping action can be obtained through the same process as above, and that the exhaust section 22 in the example of FIG. 1 becomes the intake section and the intake section 21 becomes the exhaust section. It will be obvious from

However, the present invention is not limited to the above-mentioned embodiments, and the material and dimensions of the endless belt may be changed as appropriate, or the cross-sectional shape may be formed into a U-shape, a semi-ellipse, or a boat-shape. The diameter of each rotor roll or belt roll can be increased or decreased, the shape can be made into a beer barrel shape, and the length (in the axial direction) of each rotor roll can be adjusted. It is also possible to adopt a device in which the pressure force can be finely adjusted. - The size and arrangement position may be changed as appropriate, and idle rolls similar to belt rolls may be attached to opposing corners of the guide member 35. It is also effective to provide a spring at a suitable position on the arm 8, for example, so that the clamping pressure of the clamping portion a can be finely adjusted.

[Effect of idea]

As described above, the positive displacement fluid transfer device of the present invention (1) does not require sealing liquid or lubricating oil, allows for oil-free dry exhaust, and has an extremely simple structure; (2) ) Can operate in both forward and reverse directions; (3) Can transfer liquids whether they are gases, liquids, or gas-liquid mixtures; (4) Sliding parts are (edges of) endless belts. This is only the part where the inner surface of the side housing contacts, and its sliding width is significantly smaller than that of conventional positive displacement compressors. The relative speed (that is, sliding) between the circumferential surface, the inner circumferential surface of the rotor housing, or the circumferential surface of the belt roll is almost negligible, so the sealing effect is excellent, the endless belt has a long life, and efficiency decreases due to leakage. It has practical effects such as being extremely small and easy to operate and maintain the device.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a front sectional view along the line of Fig. 2, Fig. 2 is a side sectional view, and Fig. 3 shows the relationship between the endless belt, the rotor roll, and the inner surface of the side housing. 4 to 6 are sectional views showing the operation. 1...Rotor housing, 2...Side housing, 3...Housing, 4...Rotor, 5...
Bearing, 6... Rotating shaft, 7... Intermediate plate, 8... Arm, 9... Support shaft, 10-12... Rotor roll,
15, 16... Belt roll, 21, 23... Intake part, 22, 24... Exhaust part, 31... Ear part, 3
2... Endless belt, 33... Protrusion, 35... Guide member, A... Suction chamber, B... Discharge chamber, a to c...
Nipping part.

Claims (1)

[Scope of utility model registration request] In a housing consisting of a rotor housing 1 with a circular inner peripheral surface and a pair of side housings 2, 2,
A rotor 4 in which three rotor rolls 10, 11, and 12 are attached radially around a forced rotation shaft 6 is rotatably provided, and a pair of opposing belt rolls 15 are provided at opposing positions outside the circumference of the rotor housing 1, respectively. .
and forming a pair of exhaust parts 22 and 24,
An endless belt 32 with a substantially U-shaped cross section made of a flexible material and having ears 31, 31 on both sides is attached to the rotor rolls 10, 11, 12 and the opposing belt roll 15,
16, and while in pressure contact with the side housings 2, 2, the rotor rolls 10, 11, 12 and the inner circumferential surface of the rotor housing, and the opposing belt roll 1.
5 and 16 respectively clamp the endless belt 32, and when the rotor 4 rotates at the clamping pressure parts a and b, two fluids are sucked into the housing by the inner peripheral surface of the rotor housing, the outer peripheral surface of the endless belt, and the inner surface of the side housing. A positive displacement fluid transfer device characterized in that the chamber and the two fluid discharge chambers are formed at substantially symmetrical positions with respect to the center point of the forced rotation shaft 6 of the rotor 4.