JP2022145084A - Fluid transfer device - Google Patents

Abstract

To provide a fluid transfer device which can be easily manufactured without requiring high machining accuracy.SOLUTION: A fluid transfer device is configured in the following manner: a cylindrical casing includes a cylindrical peripheral wall part, one end wall part having a first connection port capable of being connected to a first external pipe, and disposed on one end side in an axial center direction of the cylindrical peripheral wall part, and the other end wall part having a second connection port capable of being connected to a second external pipe, and disposed on the other end side in the axial center direction of the cylindrical peripheral wall part; a rotor includes a rotary shaft part pivotally supported by the one end wall part and the other end wall part of the casing to be rotated by external power, and a spiral blade part disposed on an outer peripheral surface of the rotary shaft part; the spiral blade part includes an outer peripheral sliding part which can slide while being in close contact with an inner peripheral surface of the cylindrical peripheral wall part; and fluid in the first external pipe is transferred into the second external pipe by normally rotating the rotor, and the fluid in the second external pipe is transferred into the first external pipe by reversely rotating the rotor.SELECTED DRAWING: Figure 1

Description

The present invention relates to a fluid transport device capable of transporting fluid such as gas, liquid, gel, powder, and slurry.

Patent documents 1 to 3 disclose screw type vacuum pumps (screw type dry vacuum pumps) as conventional fluid transfer devices. These conventional screw-type vacuum pumps generally have two screw rotors rotatably arranged in parallel within a casing having an air intake and an air exhaust, and a small amount of space is provided between each rotor and the inner wall surface of the casing and between the rotors. gaps are provided, and each rotor is configured to rotate by the electric motor while maintaining these gaps. As each rotor rotates, the space between each rotor and the casing is continuously transferred in the axial direction. It is designed to exhaust to

JP-A-2000-45976 JP-A-2003-97480 JP 2019-143620 A

In the case of the conventional screw type vacuum pump configured as described above, it is designed to reduce the pressure of the object to be vacuumed, which is connected to the suction port through the connection pipe, to the set vacuum pressure (about 0.1 to 1.0 Pa). In order to achieve the exhaust speed and maximum differential pressure, a rated rotation speed is required, so each rotor is rotated at high speed (generally about 3000 to 6000 min ^-1 rotation speed) by an electric motor. This causes the temperature inside the casing to rise. Therefore, it was necessary to cool the casing with a coolant in order to avoid contact between the rotors and the casing due to thermal expansion.

In addition, in the conventional screw vacuum pump, the user cannot adjust the output of the electric motor because it is necessary to rotate each rotor at high speed at the rated number of revolutions in order to obtain the set vacuum pressure as described above. Therefore, for example, even if you want to keep the object to be vacuumed in a low vacuum state (10 ⁵ to 10 ² Pa) continuously for a long time, a medium vacuum state (10 ² to 10 ^-1 Pa) exceeding the low vacuum state is required. The electric motor is driven at a high output for a long time to maintain this, resulting in a large energy loss and a shortened pump life.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fluid transfer device that takes the above circumstances into consideration.

According to the present invention, comprising a cylindrical casing and a rotating body provided rotatably on the same axis as the casing in the casing,
The casing includes a cylindrical peripheral wall portion, a first end wall portion having a first connection port connectable to a first external pipe and provided on one axial end side of the cylindrical peripheral wall portion, and a second external pipe. a second end wall portion having a connectable second connection port and provided on the other end side of the cylindrical peripheral wall portion in the axial direction;
The rotating body includes a rotating shaft portion pivotally supported by the one end wall portion and the other end wall portion of the casing so as to be rotated by an external power, and a spiral blade portion provided on the outer peripheral surface of the rotating shaft portion. and
The spiral blade portion has a spiral belt-shaped outer peripheral sliding portion that can slide while being in close contact with the inner peripheral surface of the cylindrical peripheral wall portion,
By rotating the rotating body forward, the fluid in the first external pipe flows into the casing from the first connection port and is transferred from the second connection port into the second external pipe. by reversely rotating the fluid in the second external pipe to flow into the casing from the second connection port and to be transferred from the first connection port into the first external pipe. There is provided a fluid transfer device characterized by:

Compared to conventional screw vacuum pumps, the fluid transfer device of the present invention has a smaller number of parts, a simpler structure, and does not require high-precision processing technology, so it can be easily manufactured at low cost. can.
In other words, in the conventional screw vacuum pump, the gap between the two screw rotors and the gap between each rotor and the casing must be kept minute and precise, so the processing technology is highly difficult, and the number of parts is large. , the manufacturing cost is high.
On the other hand, in the fluid transfer device of the present invention, the helical belt-shaped outer peripheral sliding contact portion of the helical blade portion of the rotor is used as a sealing portion to allow the helical belt to slide while being in close contact with the inner peripheral surface of the cylindrical peripheral wall portion of the casing. Therefore, high-precision processing technology is not required, and since it has a simple structure with a small number of parts, it can be easily manufactured at low cost.

Further, in the conventional screw vacuum pump, it is necessary to cool (to maintain a minute clearance) in order to avoid contact between the rotors rotating at high speed and the casing due to thermal expansion.
On the other hand, in the fluid transfer device of the present invention, since the outer peripheral sliding contact portion of the spiral blade portion slides while being in close contact with the inner peripheral surface of the cylindrical peripheral wall portion of the casing, it is possible to maintain a minute clearance. Does not require cooling.

In conventional screw-type vacuum pumps, it is necessary to rotate each rotor at high speed in order to move the air in the axial direction while ensuring the clearance between each rotor and the casing. Can not do it.
In contrast, in the fluid transfer device of the present invention, a low vacuum can be obtained by rotating the rotating body at a low speed, and the degree of vacuum can be increased by gradually increasing the number of revolutions of the rotating body. On the other hand, it is possible to adjust the rotation speed of the rotating body according to the desired vacuum pressure.

Furthermore, the fluid transfer device of the present invention functions as a vacuum pump for extracting gas (e.g., air) from an object to be vacuumed to reduce the pressure. , flour, etc.). Moreover, the rotating body can be rotated forward to transport the fluid in one direction, and the rotating body can be rotated in the reverse direction to transport the fluid in the opposite direction, and the gel-like solid can be transported without being pulverized. .

1 is a vertical cross-sectional view of a fluid transfer device according to an embodiment of the present invention, viewed from the front side; FIG. 2 is a right side view of the fluid transfer device of FIG. 1 as viewed from the first connection port side; FIG. 2 is a left side view of the fluid transfer device of FIG. 1 as viewed from a second connection port side; FIG. FIG. 2 is a vertical cross-sectional view of a rotating body in the fluid transfer device of FIG. 1; FIG. 5 is a left side view of the rotating body of FIG. 4 as viewed from the left side; FIG. 5 is a cross-sectional view showing a fixing portion of an outer peripheral sliding portion in the rotating body of FIG. 4; FIG. 5 is a cross-sectional view showing a fixing portion of an end portion of an outer peripheral sliding portion in the rotating body of FIG. 4; 5 is a partial perspective view showing an outer peripheral sliding portion removed from the rotating body of FIG. 4; FIG. 2 is simulation data for the fluid transfer device of FIG. 1; FIG. 5 is a cross-sectional view showing a modification of the fixing portion of the outer peripheral sliding contact portion of FIG. 4 ;

The present invention will be described in further detail below with reference to the drawings. It should be noted that the following description is illustrative in all respects and should not be construed as limiting the present invention.

FIG. 1 is a vertical cross-sectional view of a fluid transfer device according to an embodiment of the present invention viewed from the front side, and FIG. 2 is a right side view of the fluid transfer device of FIG. 1 viewed from the first connection port side. 3 is a left side view of the fluid transfer device of FIG. 1 as viewed from the second connection port side. 4 is a longitudinal sectional view of the rotating body in the fluid transfer device of FIG. 1, and FIG. 5 is a left side view of the rotating body of FIG. 4 viewed from the left side.
As shown in FIGS. 1 to 5, the fluid transfer device 1 of the present embodiment includes a cylindrical casing 10 and a rotating body 30 provided rotatably on the same axis Q as the casing 10 within the casing 10. and Further, the fluid transfer device 1 may further include an electric motor 60 that drives the rotor 30 to rotate. As the electric motor 60, a type capable of output control (rotation speed adjustment of the output shaft) and forward/reverse rotation can be used.

The casing 10 includes a cylindrical peripheral wall portion 11, a first end wall portion 12 having a first connection port 12a connectable to a first external pipe 21 and provided at one end side of the cylindrical peripheral wall portion 11 in the direction of the axis Q, and a second end wall portion 13 provided on the other end side of the cylindrical peripheral wall portion 11 in the axial center Q direction and having a second connection port 13a connectable to the second external pipe 22 . In the case of the present embodiment, the first connection port 12a and the second connection port 13a are point symmetrical with respect to the axis Q so that the first connection port 12a is on top and the second connection port 13a is on the bottom. positioned (see Figures 2 and 3).

The casing 10 also includes a pair of legs 14 respectively connected to the one end wall 12 and the other end wall 13, and a pair of connectors 15 respectively connected to the first connection port 12a and the second connection port 13a. and a pair of support portions 16 and 17 that rotatably support one end side and the other end side of a rotation shaft portion 31 (to be described later) of the rotating body 30, respectively. The one end wall portion 12 and the other end wall portion 13 of the casing 10 have insertion holes 12b and 13b on the axial center Q for airtightly inserting one end side and the other end side of the rotating shaft portion 31, respectively.

The support portion 16 provided on the one end wall portion 12 includes a cover 16a fixed to the outer surface of the one end wall portion 12, and a bearing 16b provided in the cover 16a and rotatably supporting one end side of the rotating shaft portion 31. have
The support portion 17 provided on the other end wall portion 13 includes a cover 17a fixed to the outer surface of the other end wall portion 13 and a cover 17a provided inside the cover 17a to rotatably support the other end side of the rotating shaft portion 31. and a bearing 17b. The cover 17a is provided with an insertion hole 17aa through which the other end of the rotating shaft portion 31 is airtightly inserted.

The rotating body 30 includes the rotating shaft portion 31 pivotally supported by the one end wall portion 12 and the other end wall portion 13 of the casing 10 so as to be rotated by an electric motor 60 as an external power source, and the outer peripheral surface of the rotating shaft portion 31. It has a spiral blade portion 32 provided in.
The rotating shaft portion 31 includes a round shaft-shaped large diameter portion 31a arranged in the casing 10, a pair of round shaft-shaped medium diameter portions 31b connected to one end and the other end of the large diameter portion 31a, and others. It has a round shaft-shaped small diameter portion 31c connected to the middle diameter portion 31b on the end side, and a male screw 31ba is provided at the end of each middle diameter portion 31b (see FIGS. 1 and 4).

A pair of medium-diameter portions 31b of the rotating shaft portion 31 are inserted through the insertion holes 12b and 13b of the one end wall portion 12 and the other end wall portion 13 of the casing 10, and the bearings 16b of the pair of support portions 16 and 17, 17b. Two nuts 33 are screwed onto the male threads 31ba of the pair of medium-diameter portions 31b, respectively. The rotating shaft portion 31 is thereby positioned in the direction of the axis Q (see FIG. 1).

The spiral blade portion 32 has a spiral blade main body 32a fixed to the outer peripheral surface of the rotating shaft portion 31, and a spiral belt-shaped outer peripheral sliding portion 32b detachably attached to the outer peripheral portion of the spiral blade main body 32a. Thus, the outer peripheral sliding portion 32b is adapted to slide and rotate while being in close contact with the inner peripheral surface of the cylindrical peripheral wall portion 11 of the casing 10 (see FIGS. 1 and 4).

The spiral blade main body 32a is composed of a spiral plate material (thickness of about 1 to 2 mm) having an outer peripheral portion curved to have a constant outer diameter D and an inner peripheral portion into which the rotating shaft portion 31 can be inserted. , the inner peripheral portion of which is welded to the large diameter portion 31 a of the rotating shaft portion 31 . In the case of this embodiment, the number of spiral turns of the spiral blade body 32a is 2, the spiral pitch P is about 100 mm, and the outer diameter D is about 180 mm. In particular, since the spiral blade main body 32a is formed by welding the spiral plate material to the shaft instead of machining metal, the troughs of the spiral can be deepened.

Therefore, even if the length of the casing 10 in the axial direction is shortened, the amount of fluid transferred can be increased. That is, it is possible to obtain the fluid transfer device 1 that is compact and has a large transfer amount. The number of helical turns, the helical pitch P, the outer diameter D, etc. of the helical blade body 32a can be freely set according to the application of the fluid transfer device, and this embodiment is designed for a vacuum pump.

6 is a cross-sectional view showing a fixed portion of the outer peripheral sliding portion in the rotating body of FIG. 4, and FIG. 7 is a cross-sectional view showing a fixed portion of the end portion of the outer peripheral sliding portion in the rotating body of FIG. 8 is a partial perspective view showing an outer peripheral sliding portion removed from the rotating body of FIG.
As shown in FIGS. 1 and 4 to 7, the spiral blade main body 32a has a plurality of fixing portions for detachably fixing the outer peripheral sliding portion 32b to the outer peripheral portion of the spiral blade main body 32a. The plurality of fixed portions have a plurality of receiving pieces 32aa with threaded holes that detachably receive the outer peripheral sliding portion 32b along the longitudinal direction on the outer peripheral portion, and are aligned with the respective screw holes of the plurality of receiving pieces 32aa with threaded holes. Each has a plurality of threaded pins 32ab for attachment.

The receiving pieces 32aa with a plurality of screw holes are plate pieces that are bent in a substantially Z shape, and are arranged so as to open on the outer peripheral side of the spiral blade main body 32a. ) at a predetermined center angle θ1 (for example, about 72°) and welded. However, the pair of receiving pieces 32aa with screw holes that fix both ends in the longitudinal direction of the outer peripheral sliding portion 32b are arranged with a narrow center angle θ2 (for example, 36°) from the adjacent other receiving pieces 32aa with screw holes. . Note that the center angles θ1 and θ2 are not particularly limited.

As shown in FIGS. 4 to 8, the outer peripheral sliding portion 32b includes a spiral belt-like elastic portion 32ba pressed against the outer peripheral portion of the spiral blade main body 32a by a plurality of screw pins 32ab, and the cylindrical peripheral wall portion 11 of the casing 10. and a low-friction portion 32bb integrally provided on the surface of the elastic portion 32ba so as to slide in close contact with the inner peripheral surface of the elastic portion 32ba. In addition, one groove portion 32bc into which a plurality of screw pins 32ab are inserted is provided in the elastic portion 32ba along the longitudinal direction.

In the outer peripheral sliding portion 32b, the elastic portion 32ba is made of natural or synthetic rubber and has substantially the same length as the outer peripheral portion of the spiral blade main body 32a. The elastic portion 32ba has a rectangular cross-sectional portion that is received in the space between the outer peripheral portion of the spiral blade main body 32a and the threaded receiving piece 32aa, and a semicircular portion that protrudes radially outward from the space. It is formed in a cross section.

In the outer peripheral sliding portion 32b, the low-friction portion 32bb is made of a resin material with low frictional resistance, for example, a fluororesin such as Teflon (registered trademark), and is layered so as to cover the outer surface of the semicircular cross-sectional portion of the elastic portion 32ba. Coated (vulcanized).
The groove portion 32bc is formed along one side surface of the elastic portion 32ba that is not coated with the low friction portion 32bb. In addition, you may provide several recessed parts in the elastic part 32ba instead of the groove part 32bc.

The outer peripheral sliding portion 32b is pressed against the outer peripheral portion of the spiral blade main body 32a by inserting a plurality of short screw pins 32ab into the grooves 32bc while being received by the plurality of receiving pieces 32aa with screw holes. (See FIG. 6) However, at both ends in the longitudinal direction of the outer peripheral sliding portion 32b, two long screw pins 32ab pass through the elastic portion 32ba from the groove portion 32bc and abut on the outer peripheral portion of the spiral blade main body 32a. fixed by As a result, the entire outer peripheral sliding portion 32b is stopped along the outer peripheral portion of the spiral blade main body 32a so as not to be displaced. In addition, since the outer peripheral sliding portion 32b is provided with the groove portion 32bc, if the screw pins 32ab are loosened, the position of the outer peripheral sliding portion 32b along the outer peripheral portion of the spiral blade main body 32a can be adjusted in the longitudinal direction. It becomes easier to shift the position to

In this manner, the outer peripheral sliding portion 32b received by the plurality of receiving pieces 32aa with screw holes and positioned and fixed by the plurality of screw pins 32ab is such that the top of the low friction portion 32bb is the outer peripheral portion of the spiral blade main body 32a. It protrudes slightly (0.5 to 1 mm) radially outward from the end. As a result, the low friction portion 32bb slides airtightly on the inner peripheral surface of the casing 10 when the rotor 30 rotates, but the outer peripheral portion of the spiral blade main body 32a does not slide on the inner peripheral surface of the casing 10. FIG.

Therefore, as shown in FIG. 1, by driving the electric motor 60 of the fluid transfer device 1 to rotate the rotating body 30 forward in the direction of arrow A (counterclockwise when viewed from the first connection port 12a side), the first The fluid in one external pipe 21 can flow into the casing 10 from the first connection port 12a and can be transferred into the second external pipe 22 from the second connection port 13a.

As an example of a specific application of this fluid transfer device 1, a rotary tank of an organic waste treatment device in which organic waste introduced into the cylindrical rotary tank while rotating around a horizontal axis is decomposed by microorganisms. It can be used as a vacuum pump to reduce the pressure inside.

In this case, the first connection port 12a of the fluid transfer device 1 is connected to the organic waste treatment device through the first external pipe 21, and the rotor 30 is rotated forward to reduce the pressure in the rotary tank. At this time, for example, the rotating body 30 continues to rotate forward, so that gas (including air, steam, gas generated in the fermentation process, etc.) in the rotary tank passes through the casing 10 and is discharged into the second external pipe 22. and the interior of the rotary tank is maintained in a low vacuum state (10 ⁵ to 10 ² Pa). At this time, there is no need to cool the casing 10 with water or the like. A check valve may be provided between the connector 15 of the second connection port 13a of the casing 10 and the second external pipe 22 to prevent backflow of gas, and the downstream end of the second external pipe may be It may be connected to an odor treatment device to exhaust deodorized gas into the atmosphere.

In addition, if the fluid transfer device 1 is connected to a device that requires a higher degree of vacuum, and the output of the electric motor 60 is increased to rotate the rotating body 30 to about 250 to 1500 min ^-1 , the interior of the device can be placed in a medium vacuum ( 10 ² to 10 ^-1 Pa) is also possible. Moreover, there is no need to cool the casing with water or the like.

In addition to transporting gases such as air, the fluid transfer device 1 can also transfer liquids such as water and drinking water, gels such as jelly and agar, powders such as flour and cement, mortar, ready-mixed concrete, and the like. It can be used as a device to transfer various fluids such as slurries from one side (eg a storage tank) to the other side (eg a subsequent processing unit). Furthermore, the fluid transfer device 1 transfers various fluids from the second connection port 13a side to the first connection port 12a side by rotating the rotating body 30 in the reverse direction (the direction opposite to the direction of the arrow A in FIG. 1). is also possible.

As described above, the main reason why the fluid transfer device 1 can transfer various fluids such as liquid, gel, powder, and slurry in addition to gas is that, unlike the conventional screw type vacuum pump, the two rotors are provided. It is not a single piece, but a rotor with spiral blades welded to the shaft, so a wide flow path can be secured. Like a conventional screw type vacuum pump, between rotors and each rotor and casing The outer peripheral sliding portion 32b is capable of rotating at a low speed without forming a minute clearance, and preventing the rotation of each rotor from being blocked by a fluid (solid matter) caught in the clearance. It is easy to replace, and has a simple structure, so it is easy to maintain.

FIG. 9 shows simulation data of the fluid transfer device 1 of FIG. This simulation data is derived based on the following conditions.
Volume of casing 10: 2434.8 cm ³
Spiral pitch P: 100mm
Number of spiral turns of spiral blade main body 32a: 2
Diameter of rotating shaft portion 31: 32 mm
Valley depth of spiral blade main body 32a: 73.5 mm
Outer diameter D of spiral blade main body 32a: 179 mm
Capacity of the tank to be vacuumed: 690L

In the simulation data of FIG. 9, the relationship between the rotation speed of the rotating body 30 of the fluid transfer device 1, the pressure inside the tank, and the exhaust time (elapsed time) is calculated by the following equation (1).
t=V/S*2.303logP1/P2 (1)
t: Evacuation time V: Tank volume S: Effective exhaust speed P1: Current tank internal pressure P2: Target tank internal pressure Note that in the above equation (1), the common logarithm (log ₁₀ ) is converted to the natural logarithm (ln). is multiplied by 2.303.
Also, the effective exhaust speed S at standard atmospheric pressure (101325 Pa) is defined according to the rotation speed as follows.
250 (min ^-1 ) S = 1217.41725
500 (min ^-1 ) S = 2434.8345
750 (min ^-1 ) S = 3652.25175
1000 (min ^-1 ) S = 4869.669
1250 (min ^-1 ) S = 6087.08625
1500 (min ^-1 ) S = 7304.5035
Note that the effective exhaust speed S at standard atmospheric pressure (101325 Pa) = the volume of the casing 10 (2434.8 cm ³ ) x the number of spiral turns of the spiral blade main body 32a (2) x the rotational speed (250 to 1500 min ^-1 ).

From this simulation data, it can be seen that the target pressure is reached in 0.36 min at a rotation speed of 1500 min ⁻¹ in order to set the internal pressure of the 690 L capacity tank to 4000 Pa (low vacuum).

FIG. 10 is a cross-sectional view showing a modification of the fixing portion of the outer peripheral sliding contact portion of FIG. In FIG. 10, elements similar to those in FIG. 6 are given the same reference numerals.
As shown in FIG. 10, the spiral blade portion 132 may be provided with a receiving piece 132aa with a screw hole as a fixing portion at the end of the outer peripheral portion of the spiral blade main body 32a.

In this case, the receiving piece 132aa with a threaded hole is composed of a small U-shaped portion that is welded across the outer peripheral portion of the spiral blade body 32a and a large U-shaped portion that receives the outer peripheral sliding portion 132b. , a pair of screw holes are formed in the large U-shaped portion.
Further, the outer peripheral sliding portion 132b has an elastic portion 132ba having groove portions 32bc on both side surfaces, and a low friction portion 132bb covering a part of the surface of the elastic portion 132ba. The top of the low-friction portion 132bb protrudes radially outward by about 0.5 to 1 mm from the receiving piece 132aa with a screw hole.

By screwing the screw pins 32ab into the pair of screw holes in the large U-shaped portion of the threaded receiving piece 132aa, the pair of screw pins 32ab are fitted into the pair of grooves 32bc of the outer peripheral sliding portion 132b to slide on the outer periphery. The portion 132b is positioned and fixed. Although not shown, both ends of the outer peripheral sliding portion 132b are formed by screwing one screw pin 32ab through the outer peripheral sliding portion 132b and screwing it into the screw hole on the opposite side as shown in FIG. Prevents misalignment.

(summary)
As mentioned above,
(1) A fluid transfer device according to the present invention includes a cylindrical casing and a rotating body rotatably provided in the casing on the same axis as the casing,
The casing includes a cylindrical peripheral wall portion, a first end wall portion having a first connection port connectable to a first external pipe and provided on one axial end side of the cylindrical peripheral wall portion, and a second external pipe. a second end wall portion having a connectable second connection port and provided on the other end side of the cylindrical peripheral wall portion in the axial direction;
The rotating body includes a rotating shaft portion pivotally supported by the one end wall portion and the other end wall portion of the casing so as to be rotated by an external power, and a spiral blade portion provided on the outer peripheral surface of the rotating shaft portion. and
The spiral blade portion has a spiral belt-shaped outer peripheral sliding portion that can slide while being in close contact with the inner peripheral surface of the cylindrical peripheral wall portion,
By rotating the rotating body forward, the fluid in the first external pipe flows into the casing from the first connection port and is transferred from the second connection port into the second external pipe. by reversely rotating the fluid in the second external pipe to flow into the casing from the second connection port and to be transferred from the first connection port into the first external pipe. characterized by

The fluid transfer device according to the present invention may be configured as follows, or may be combined as appropriate.
(2) The spiral blade portion has a spiral blade main body fixed to the outer peripheral surface of the rotating shaft portion, and the outer peripheral sliding portion detachably attached to the outer peripheral portion of the spiral blade main body. can be anything.
According to this configuration, the old outer peripheral sliding portion can be removed from the spiral blade main body and replaced with a new outer peripheral sliding portion.

(3) The spiral blade main body has a plurality of receiving pieces with threaded holes that detachably receive the outer peripheral sliding portion along the longitudinal direction of the outer peripheral portion, and each screw of the plurality of receiving pieces with threaded holes having a plurality of threaded pins that engage the holes;
The outer peripheral sliding portion may be held by the plurality of screw pins against the outer peripheral portion of the spiral blade main body while being received by the plurality of receiving pieces with screw holes.
According to this configuration, it is possible to obtain a mounting structure that facilitates attachment and detachment of the outer peripheral sliding portion to and from the spiral blade main body.

(4) The outer peripheral sliding portion may have grooves or a plurality of recesses along the longitudinal direction into which the plurality of screw pins are inserted.
According to this configuration, it becomes easy to fix the outer peripheral sliding portion to the spiral blade body and adjust the position thereof by means of the plurality of screw pins.

(5) Of the plurality of screw pins, a pair of screw pins corresponding to both ends in the longitudinal direction of the outer peripheral sliding portion pass through the outer peripheral sliding portion and come into contact with the outer peripheral portion of the spiral blade main body. It may be in contact.
According to this configuration, it is possible to easily prevent longitudinal displacement of the outer peripheral sliding portion with respect to the outer peripheral portion of the spiral blade main body.

(6) The outer peripheral sliding portion includes a spiral belt-shaped elastic portion pressed by the plurality of screw pins, and the elastic belt so as to slide in close contact with the inner peripheral surface of the cylindrical peripheral wall portion of the casing. and a low-friction portion integrally provided on the surface of the portion.
According to this configuration, the outer peripheral sliding portion can be formed by insert molding in which the elastic portion is set in the mold and the fluororesin is poured.

(7) further comprising an electric motor having an output shaft coupled to the rotating shaft portion of the rotating body;
The electric motor may be adjustable in output.
According to this configuration, the number of rotations of the rotor can be adjusted according to the type and purpose of the fluid to be transferred.

Preferred aspects of the invention also include combinations of any of the aspects described above.
In addition to the embodiments described above, various modifications of the present invention are possible. Those modifications should not be construed as not belonging to the scope of the present invention. The present invention should include all modifications within the scope of the claims, the meaning of equivalents, and the scope.

Reference Signs List 1: fluid transfer device 10: casing 11: cylindrical peripheral wall portion 12: one end wall portion 12a: first connection port 12b: insertion hole 13: other end wall portion 13a: second connection port 13b: Insertion hole 14: Leg 15: Connector 16: Support 16a: Cover 16b: Bearing 17: Support 17a: Cover 17aa: Insertion hole 11b: Bearing 21: First exterior Pipe 22: Second external pipe 30: Rotating body 31: Rotating shaft portion 31a: Large diameter portion 31b: Medium diameter portion 31ba: Male screw 31c: Small diameter portion 32: Spiral blade portion 32a : Spiral blade main body 32aa: Receiving piece with threaded hole 32ab: Screw pin 32b: Peripheral sliding part 32ba: Elastic part 32bb: Low friction part 32bc: Groove part 33: Nut 60: Electric motor 132 : spiral blade portion 132aa: threaded receiving piece 132b: outer peripheral sliding portion 132ba: elastic portion 132bb: low friction portion D: outer diameter P: helical pitch Q: shaft center

Claims (7)

A cylindrical casing and a rotating body provided rotatably on the same axis as the casing in the casing,
The casing includes a cylindrical peripheral wall portion, a first end wall portion having a first connection port connectable to a first external pipe and provided on one axial end side of the cylindrical peripheral wall portion, and a second external pipe. a second end wall portion having a connectable second connection port and provided on the other end side of the cylindrical peripheral wall portion in the axial direction;
The rotating body includes a rotating shaft portion pivotally supported by the one end wall portion and the other end wall portion of the casing so as to be rotated by an external power, and a spiral blade portion provided on the outer peripheral surface of the rotating shaft portion. and
The spiral blade portion has a spiral belt-shaped outer peripheral sliding portion that can slide while being in close contact with the inner peripheral surface of the cylindrical peripheral wall portion,
By rotating the rotating body forward, the fluid in the first external pipe flows into the casing from the first connection port and is transferred from the second connection port into the second external pipe. by reversely rotating the fluid in the second external pipe to flow into the casing from the second connection port and to be transferred from the first connection port into the first external pipe. A fluid transfer device characterized by: The spiral blade portion has a spiral blade main body fixed to the outer peripheral surface of the rotating shaft portion, and the outer peripheral sliding portion detachably attached to the outer peripheral portion of the spiral blade main body. 2. The fluid transfer device according to claim 1. The spiral blade main body has a plurality of receiving pieces with threaded holes for detachably receiving the outer peripheral sliding portion along the longitudinal direction of the outer peripheral portion, and the threaded holes of the plurality of receiving pieces with threaded holes are threaded. having a plurality of threaded pins attached to it;
3. The outer peripheral sliding portion according to claim 2, wherein the outer peripheral sliding portion is pressed against the outer peripheral portion of the spiral blade body by the plurality of screw pins while being received by the plurality of receiving pieces with screw holes. Fluid transfer device. 4. The fluid transfer device according to claim 3, wherein the outer peripheral sliding portion has grooves or a plurality of recesses along the longitudinal direction into which the plurality of screw pins are inserted. A pair of screw pins among the plurality of screw pins corresponding to both ends in the longitudinal direction of the outer peripheral sliding portion pass through the outer peripheral sliding portion and come into contact with the outer peripheral portion of the spiral blade main body. 5. A fluid transfer device according to Item 3 or 4. The outer peripheral sliding portion includes a helical belt-shaped elastic portion pressed by the plurality of screw pins, and a surface of the elastic portion so as to slide in close contact with the inner peripheral surface of the cylindrical peripheral wall portion of the casing. 6. The fluid transfer device according to any one of claims 3 to 5, further comprising a low-friction portion provided integrally with the fluid transfer device. further comprising an electric motor having an output shaft coupled to the rotating shaft portion of the rotating body;
The fluid transfer device according to any one of claims 1 to 6, wherein the electric motor is adjustable in output.

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