JP2019019742A - High-viscosity fluid pump - Google Patents

Abstract

To reduce pump pulsation, to reduce cleaning maintenance cost and to shorten manufacture line downtime while avoiding degeneration and damage of a high-viscosity fluid caused by dynamic viscous friction between a pump drive body and a housing while enabling the high-viscosity fluid to be transferred.SOLUTION: A high-viscosity fluid pump is provided. The high-viscosity fluid pump is characterized in that two rotors each including a rugged curved surface in an outer peripheral part are synchronized and rotated while facing each other within a pump chamber, and a suction region and a discharge region are separated by meshing the rugged curved surfaces with each other. A high-viscosity fluid is taken from a suction port through the suction region into multiple chambers that are dynamically formed from the rugged curved surfaces and a pump inner wall. The high-viscosity fluid is transferred to a rotation downstream side by rotating the chambers around an axis and can be discharged from a discharge port. A housing incorporates a first rotor, a second rotor and a timing gear for synchronizing the rotors.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a positive displacement pump for transferring a high-viscosity fluid.

  Screw pumps and gear pumps are used to pump foods or high-viscosity liquids used as food ingredients. Plunger pumps are not suitable for high-viscosity fluids because pumping of high-viscosity liquids cannot completely operate the suction valve and discharge valve.

  The screw pump uses a kinematic viscosity between the screw surface and the tube inner surface to convey a fluid from one end to the other end. In the case of a high-viscosity fluid, there is a limit that the screw itself cannot be rotated or the conveyance becomes unstable depending on circumstances.

  A high-viscosity liquid pump used as a food or a raw material for food generally has a structure in which a transported product adheres to a pump component, and there is a problem that it is difficult to clean the component that causes product adhesion. Patent document 1 says that the arrangement of the bearing and the structure of the gear pump are devised to make the pump easy to clean. However, this relates to the arrangement of the bearing and the like, and is not suitable for general pumps. The need to clean the pump components that come into contact with the food is a common problem in high-viscosity liquid pumps that are food or food ingredients. And, in the case of pump cleaning as in the example of Patent Document 1, the product needs to be reassembled after disassembling and cleaning, 1) reduction in cleaning maintenance cost, and 2) shortening of production line downtime has been required. (Patent Document 1, paragraph 0030, second sentence from the end).

  In the case of a high-viscosity fluid, the gear pump is often damaged by sliding between gears and adversely affects its properties.

  Next, the high-viscosity fluid transfer pump includes a rotary pump, and a type using a biaxial rotor is disclosed in Non-Patent Document 1. The pump disclosed in Non-Patent Document 1 creates a vacuum in the suction port of the pump by two rotating rotors, sucks liquid into the space, and the two rotating rotors are rotated in a non-contact manner by a timing gear. The pump fluid is pushed out “continuously” (where “continuous” is an expression described in the explanation of the principle of operation in non-patent literature) every time the two rotors rotate 180 degrees. Yes (non-patent document 1, operating principle diagram described on the same page). In this configuration, the pulsation is not suppressed, and the discharge of the pump fluid can be said to be intermittent rather than continuous.

  In pumping of high-viscosity fluid, once the rotor has stopped and a certain amount of time has passed, adsorption occurs at the interface between the high-viscosity fluid and the solid, or the difference or change in the properties of the high-viscosity fluid between the stationary state and the pumping state. As a result, the rotor may be adsorbed or fixed to the pump housing. This point is substantially the same as the problem of the screw type pump, and may be a problem unlike a pure plunger type pump. In particular, the adsorption phenomenon has a problem that the generation conditions are complicated, and the generation has a stochastic element and is difficult to predict.

Special table 2011-518276 gazette http://www.miuraz.co.jp/product/pump/vrp.html, Miura top page> Product information> Pump / boiler parts> High viscosity liquid transfer pump VRP, July 13, 2017

The main problem of the present invention is that the transfer of the high-viscosity fluid avoids the alteration and damage of the high-viscosity fluid due to kinematic viscous friction between the pump driver and the housing
1. Reduce pump pulsation,
2. Reduce cleaning maintenance costs,
3. Shorten production line downtime,
Is to provide a high-viscosity fluid pump.

High viscosity fluid pump according to the present invention,
A first rotor having a cross section forming a convex curved surface;
A second rotor having a cross section forming a concave curved surface and arranged parallel to the axial direction of the first rotor;
At least one set of timing gears integrally coupled to the end face of each rotor and capable of synchronizing the rotation of the rotor; and
A first pump chamber formed in a concentric cylindrical shape coaxial with the first rotor, and a second pump chamber formed in an axial concentric cylindrical shape with the second rotor in parallel with the first pump chamber. A housing part having a bearing part capable of rotatably supporting the two rotors;
The high-viscosity fluid pump includes a plurality of concavo-convex curved surface portions that are the same number of concavo-convex curved surfaces that can be rotated synchronously so that the outer edges of the axial cross-sections of the two rotors mesh with each other by the timing gear. The housing has a high-viscosity fluid suction port on one side perpendicular to the axial direction at the center of the meshing portion of the two rotors and a discharge port facing the suction port on the other side. The pump is a high-viscosity fluid pump, wherein the housing contains a first rotor, a second rotor, and the timing gear.

  The space on the fluid inlet side of the pump is increased in volume by the rotation of the rotor and the space on the outlet side is reduced in volume, and suction / discharge is performed. In the present invention, the sucked fluid is discharged by the action of the rotary pump. Carried to the side. That is, with the rotation of the concave and convex curved surface portion due to the rotation of the rotor, a high-viscosity fluid is vacuum-sucked from the suction port by expanding the space on the fluid inlet side, the space surrounded by the arc portion and the pump chamber inner wall, the convex curved surface portion and the housing A chevron-shaped rotary chamber surrounded by the inner wall is swiveled around the axis on the first pump chamber side, and the rotary chamber surrounded by the convex curved surface portion and the housing pump chamber inner wall is swung around the axis to the discharge port side by the pushing action. The pump fluid and the housing are swirled and transported to the outside of the discharge port so that the convex curved surface portion of the first rotor and the concave curved surface portion of the second rotor are engaged and compressed. It will be completed while avoiding alteration and damage of high viscosity fluid due to kinematic viscous friction. And the effect that a pump pulsation and load fluctuation are smoothed by formation and rotation of a plurality of rotary chambers is also acquired.

  Here, the timing gear can synchronize the rotation of the rotors, but is integrally coupled to the end face of the rotor and disposed in the flow path of the transport liquid. As a result, in the cleaning process after completing the manufacturing process of one lot, the cleaning is completed in the same process as the pump chamber and the flow path are cleaned, and the timing gear is disposed outside the pump chamber and the flow path of the transport liquid. High-viscosity fluid that has the advantage that the disassembly process of the pump chamber components before cleaning and the reassembly process after cleaning can be omitted compared to conventional systems, reducing cleaning maintenance costs and shortening the production line downtime Provide a pump.

  In another aspect, a groove may be formed on the two concave surfaces and the convex surface so that the surfaces facing each other do not adhere to each other.

  When the groove is formed in this way, an effect of increasing the surface distance between the opposing surfaces and reducing the kinematic viscosity resistance by the groove can be obtained.

  When the groove is formed in this way, the surface distance between the opposing surfaces is increased by the groove, the meniscus formation at the stationary time is prevented, and the static adhesion resistance is reduced.

  In another aspect, a high-viscosity fluid pump may be provided that is the housing connected to the opening and communicating with the opening and the second pump chamber to form a cylindrical cavity in the axial direction.

  In another configuration, the meshing portion may include four.

  Thus, if there are four meshing parts, the meshing parts are formed more densely than the three meshing parts, the number of concave and convex curved surface parts is the same, and the gap between the meshing parts is set to the minimum. An effect that is possible is obtained.

  In another configuration, the meshing portion may be composed of six or more.

  Thus, if the meshing portion is composed of six or more, the meshing portion is formed more densely and the pump pulsation is further reduced. The effect that the angle of separation between the meshing portions can be set smaller can be obtained.

As described above, according to the present invention, while avoiding deterioration and damage of a high-viscosity fluid due to kinematic viscous friction between the pump driver and the housing,
1. Reduce pump pulsation,
2. Reduce cleaning maintenance costs,
3. Shorten production line downtime,
It is possible to provide a high-viscosity fluid pump that achieves the above.

It is a disassembled perspective schematic diagram except the rotating shaft inside the housing of the high viscosity fluid pump 1 which is one Embodiment of the high viscosity fluid pump which concerns on this invention. It is a perspective schematic diagram of the housing appearance of high viscosity fluid pump 1 which is one embodiment of the high viscosity fluid pump concerning the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic front view of a high-viscosity fluid pump 1 that is an embodiment of a high-viscosity fluid pump according to the present invention. 6 is a schematic front view of the deformable high-viscosity fluid pump 1 in which the rotors 20 and 30 that are internal housing components are not hatched. In order to conceptually show the assembled rotor gear structure of the high-viscosity fluid pump 1 that is an embodiment of the high-viscosity fluid pump according to the present invention, the high-viscosity fluid pump 1 is drawn only through the housing through the housing. It is a side surface schematic diagram. It is a side perspective schematic diagram which shows notionally the composition of the rotor and timing gear which see through a housing of the assembly state of high viscosity fluid pump 100 which is other embodiments of the high viscosity fluid pump concerning the present invention. It is a pump cycle chart figure of the high viscosity fluid pump 1 which is one embodiment of the high viscosity fluid pump concerning the present invention. It is a side surface schematic diagram which permeate | transmits the housing corresponding to the pump cycle of the high viscosity fluid pump 1 which is one Embodiment of the high viscosity fluid pump which concerns on this invention.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

<One Embodiment of High Viscosity Fluid Pump 1 According to the Present Invention>
The high-viscosity fluid pump 1 according to the present invention includes:
A first rotor 20 having a cross section forming a convex curved surface 21;
A second rotor 30 having a cross section forming a concave curved surface 22 and being arranged parallel to the rotor 20 in the axial direction;
At least one set of timing gears 42, 43 that can be synchronized with the end faces of the rotors 20, 30 by, for example, screw fastening, and that can synchronize the rotation of the rotors 20, 30;
The first pump chamber 23 formed in a substantially cylindrical shape concentric with the first rotor 20 in the axial direction AX, and the first pump chamber 23 and the second rotor 30 in the axial direction in parallel with the first axial direction AX. Bearing units 15, 16, 17, and 18 having a second pump chamber 33 formed in a substantially concentric cylindrical shape along AX 'and capable of rotatably supporting the rotors 20 and 30 (see FIG. A housing 3 having 18 (not shown);
The high-viscosity fluid pump 1 includes the same number of concave and convex surface shapes in which the two rotors 20 and 30 are opposed to each other so that the outer edges of the shaft cross-sections thereof are meshed with each other by the timing gears 42 and 43. As shown in FIG. 2, the housing 3 of the high-viscosity fluid pump 1 is one axially perpendicular to the central portion of the meshing portions of the two rotors 20 and 30. The high-viscosity fluid pump 1 includes a suction port 7 for a high-viscosity fluid on the side and a discharge port 8 facing the suction port 7 on the other side. The housing 3 includes a first rotor 20 and a second rotor. 30 and the timing gears 42 and 43 are built in.

  Here, the meshing does not necessarily need to be in contact, and may be slightly spaced apart. The convex surface portion 21 has an axial cross-section arc shape, and a concave surface portion 71 is formed between the adjacent convex surface portions 21. A concave bevel portion 71 is formed in a shape. The concave curved surface portion 22 has the above-mentioned arc sectional arc shape that meshes with the concave curved surface portion 21, and the above axial sectional arc shape that meshes with the concave curved surface portion 71 between the adjacent concave curved surface portions 22. And a convex phase portion 72 having an arc-shaped cross section with a phase shifted by 180 °.

  Further, the timing gear may further include additional timing gears 46 and 47 so as to be coupled to both end faces of the rotor so as to support the rotor, and may be incorporated in the housing 3.

  The rotor 20 and the rotor 30 shown by a two-dot chain line in FIG. 4 are sandwiched between timing gears 43 and 46 and timing gears 42 and 47, respectively. Bearing units 15, 16, and 17 that are fixedly coupled to the shafts 61 and 62 and screwed to the outer surface of the pump chamber of the back plate 10 and the front plate 9 and the housing main bodies 4 and 5. , 18 constitute a bearing portion and rotatably support the rotors 20, 30. Further, the shaft 62 is fixedly connected to a drive shaft of a motor drive mechanism (not shown). Not limited to this, the housing 3 may be supported rotatably.

<Operational effect of the present invention shown in the same embodiment>
In the high-viscosity fluid pump 1 according to the present invention, the rotors 20 and 30 rotate around the respective axes AX and AX ^′, and pump chambers 23 and 33 formed on the inner surfaces of the upper and lower housing bodies 4 and 5 of the housing part 3. A plurality of chambers 37, 38 (shown in FIGS. 3 and 7) formed in the pump chamber surrounded by the inner wall surface, the inner surface of the housing front plate 10, the inner surface of the housing back plate 9, and the inner surface of the housing side plate 51. Is rotated around the AX axis concentric with the rotating shaft 62 of the rotor 20, and the high-viscosity fluid is pumped.

  The operational effects of the high-viscosity fluid pump 1 in the operating state will be described with reference to the transition diagram 7 at each stage of the pump operation. 7A to 7E, in general, the half-rotation of the convex portion or the concave portion provided in the rotor is one cycle, and one cycle is categorized as each stroke. FIG. 6 shows a pump cycle chart S1. Here, the starting point of one pump cycle is defined as the time when the outer edge boundary of the rotor 20 approaches the inner surface 23 of the pump and the formation of the chamber starts. Therefore, one cycle is from the start of the formation of the chamber to the rotation of 180 ° about the AX axis concentric with the rotation axis.

It is as follows when the process is classified and explained in the time course.
(1) Pre-conveyance stage (first stroke: S10, FIG. 7 (a))
(2) First transfer stage (until the first chamber is formed, the second step: S20, FIGS. 7B and 7C)
(3) Second transfer stage (until the subsequent chamber is formed, the third step: S30, FIG. 7 (d))
(4) Discharge stage (fourth stroke: S40, FIG. 7 (e))
(5) Repeat from S10

  As shown in FIG. 7A, the transport liquid 200 (hatched line portion in FIG. 7) is sucked from the suction port 7, and at the same time, the transport liquid is discharged from the discharge port as shown in FIG. 7E. Paying attention to one transfer lot of the transfer liquid, transfer is repeated for each chamber by repeating steps (1) to (5) in which the transfer liquid lot is transferred as the rotor 20 rotates.

  That is, the processes described in () of (1) to (5), S10, S20, S30, and S40 are categorized over time of the rotary machine with respect to the rotor rotation, and S10 → S20 → S30 → S40 → S10 corresponds to one cycle of the pump function. In the embodiment shown in FIG. 1, the rotors 20 and 30 have four meshing portions and are repeated four cycles for one rotation of the rotor. The discharge amount is dispersed in four discharge cycles during one rotation of the rotor, and the amount discharged in one cycle is averaged and smoothed in the swirl region formed by the convex phase portion, and the inner surface arc of the first pump chamber If the radius is R, and the inner surface arc radius of the second pump is r, the rotational frequency is f, and the discharge amount H per pump shaft length (hereinafter also simply referred to as pump length) (hereinafter simply referred to as discharge amount). May also be given by the following equation (1).

  The discharge amount H per hour per pump length is leveled to the equation (1). If the shape parameters of the concave and convex portions of the rotor meshing part become parameters of the discharge amount per hour, and both are in a close complement relationship, the discharge amount H per hour per pump length using the inner radius of both pumps as a parameter Is in the relationship of equation (1). In particular, when the meshing portion is configured with an even number as in this embodiment, the corresponding chamber volumes of the first pump chamber side chamber and the second pump chamber side chamber are always constant, providing a stable discharge amount. To give the effect. It is difficult to form a meshing form that can be sufficiently complemented with two meshing parts. If three meshing parts are used, the opening angle of the recess of one chamber is almost 120 °, which is an obtuse angle. It is sufficient and (4) it is insufficient for the discharge in the discharge stage (fourth stroke: S40). Four is preferable for squeezing and discharging, and four engagement structure is preferable. However, if this is further increased, it should be noted that even if it is increased, the depth of the chamber will be reduced. The embodiment discloses four cases as suitable conditions.

  If the number of meshing portions is increased, the inner surface arc radius r of the second pump becomes relatively large when the surface connection of the uneven surface is made smooth. As a result, since the difference between R and r is small, the discharge amount H is reduced by the equation (1). Therefore, there is an advantage that the four meshing portion configurations are configurations that provide a discharge capacity with substantially maximum capacity.

  In the case of a curved surface configuration using an arc shape, the chambers 37 and 38 using the convex curved surface 21 and the like are rapidly separated from the wall surface of the pump chamber toward the center of the radius due to the convex phase, so that the inner wall surface of the pump and the rotor are sufficiently sufficient. A gap is ensured between them, and the shearing force is hard to work on the high-viscosity fluid, minimizing damage and alteration of the high-viscosity fluid. Despite the high kinematic viscosity coefficient μ, high-viscosity fluids can secure a sufficient clearance, so even if they are proportional to the kinematic viscosity coefficient μ, the relaxation action that is inversely proportional to the clearance minimizes damage and alteration due to shear force. An effect is obtained.

  In the present embodiment, an axial groove 36 is provided on the concave curved surface 22 of the rotor 30. The groove 36 keeps the separation between the curved surfaces of the meshing portion, minimizes damage and alteration due to the shearing force of the high-viscosity fluid, prevents sticking of the high-viscosity fluid to the meshing solid surface at the time of stop, and forms meniscus The effect of preventing adsorption is obtained. The groove is preferably about 1 mm, and the direction thereof may be in the axial direction or in the transverse direction. For example, an axial groove 36 may be added as in the present embodiment. It may be provided in the direction of the herringbone pattern.

  In the present embodiment, the convex curved surface 21 and the concave curved surface 22 mesh with each other in a curved surface configuration using an arc shape. The meshing portion exhibits a sufficient sealing performance, and the addition of the groove 36 can enhance the sealing effect even if the meshing portion is separated.

  The groove may be formed as a groove 35 on the rotor end surface facing the housing back plate 9 and the front plate 10. In this configuration, the groove 35 causes the end surface of the rotors 20 and 30, the housing back plate 9, and the housing front plate 10 to be formed. In other words, the high-viscosity fluid is prevented from being damaged or altered by the shearing force of the high-viscosity fluid, and the high-viscosity fluid is prevented from sticking to the meshing solid surface at the time of stoppage.

  In the present embodiment, the suction port 7 and the discharge port 8 are relative, and if the pump rotation direction is reversed, the suction port 7 can also be used as a discharge port. 8 is used as a suction port. Especially during cleaning, the pump chamber is cleaned in this way. When cleaning, since the timing gears 42, 43, 46, and 47 are built in the housing as in the present invention, the cleaning can be performed simultaneously with the cleaning in the pump chamber, and the case where the gears are disposed outside the housing. Thus, it is not necessary to disassemble the housing 3. The bearing unit is outside the pump chamber and does not require cleaning of this part, and can be easily replaced if necessary. Therefore, according to the present invention, the cleaning process can be simplified, the maintenance cost can be reduced, and consequently the production line downtime can be shortened.

<Another Example of High Viscosity Fluid Pump According to the Present Invention>
FIG. 5 is a schematic perspective view showing another embodiment of the high-viscosity pump 100, and shows the configuration of the rotor and the timing gear shown through the housing (the rotating shaft is not shown). In this embodiment, the timing gear and the rotor are integrally cast and molded by the lost wax manufacturing method, so that it is possible to obtain an advantage that precise formation is possible. Other components may be the same as those of the high-viscosity pump 1 according to the first embodiment.

  Although the embodiment according to the present invention has been described above, the embodiment described here is described in considerable detail. However, the applicant does not intend to limit or limit the appended claims to such detailed description in any way. In addition, the present invention is not limited to such an embodiment, and the part of the configuration of the invention expressed in one embodiment can be adopted in other embodiments, and Various modifications can be made without departing from the spirit of the invention. In addition, each effect for solving the problems of the invention taken up here is not limited to appearing in one embodiment at the same time, and it is enough that at least one of them is expressed and the object of the invention is achieved. Yes, those skilled in the art can easily judge. Accordingly, the invention is broadly limited to specific details, each device and method disclosed and described herein, or combinations thereof, examples, and the spirit of Applicant's general inventive concept. It is possible to deviate from these details without departing from the scope.

  The present invention is a high-viscosity fluid pump that seals and swirls high-viscosity fluid in a multi-chamber and hardly applies shearing force to the high-viscosity fluid. It is suitable for the use of a production line.

DESCRIPTION OF SYMBOLS 1,100 High-viscosity fluid pump 3 Housing part 4, 5 Housing main body 7 Suction port 8 Discharge port 9 Housing back plate 10 Housing front plate 15, 16, 17, 18 Bearing unit 20 First rotor 21 Convex curved surface 22 Concave shape Curved surface 23 First pump chamber 27, 28 Shaft hole 30 Second rotor 33 Second pump chamber 35, 36 Groove 37, 38 Chamber 42, 43, 46, 47 Timing gear 61, 62 Shaft 71 Concave curved surface 72 Convex Shape phase 200 Transport liquid
AX Axial direction AX ^' Axial direction S1 Pump cycle S10 First stroke S20 Second stroke S30 Third stroke S40 Fourth stroke

Claims (12)

A first rotor having a cross section forming a convex curved surface;
A second rotor having a cross section forming a concave curved surface and arranged parallel to the axial direction of the first rotor;
At least one set of timing gears integrally coupled to the end face of the rotor and capable of synchronizing the rotation of each rotor; and
A first pump chamber formed in a concentric cylindrical shape coaxial with the first rotor, and a second pump chamber formed in an axial concentric cylindrical shape with the second rotor in parallel with the first pump chamber. A housing part having a bearing part capable of rotatably supporting the two rotors;
The high-viscosity fluid pump includes a plurality of concavo-convex curved surface portions that are the same number of concavo-convex curved surfaces that can be rotated synchronously so that the outer edges of the axial cross-sections of the two rotors mesh with each other by the timing gear. The housing has a high-viscosity fluid suction port on one side perpendicular to the axial direction at the center of the meshing portion of the two rotors and a discharge port facing the suction port on the other side. A high-viscosity fluid pump, wherein the housing contains the first rotor, the second rotor, and the timing gear. A first rotor having a cross section forming a convex curved surface;
A second rotor having a cross section forming a concave curved surface and arranged axially parallel to said rotor;
At least one set of timing gears integrally coupled to the end face of the rotor and capable of synchronizing the rotation of each rotor; and
A first pump chamber formed in an axial concentric cylinder with the first rotor, and a second pump formed in an axial concentric cylinder with the second rotor in parallel with the first pump chamber in the axial direction. A housing portion having a bearing portion capable of forming a plurality of chambers surrounded by the pump chamber inner surface and the convex curved surface and concave curved surface of the rotor and capable of rotatably supporting the two rotors. ;
The high-viscosity fluid pump includes a plurality of concavo-convex curved surface portions that are the same number of concavo-convex curved surfaces that can be rotated synchronously so that the outer edges of the axial cross-sections of the two rotors mesh with each other by the timing gear. The housing has a high-viscosity fluid suction port on one side perpendicular to the axial direction at the center of the meshing portion of the two rotors and a discharge port facing the suction port on the other side. A high-viscosity fluid pump, wherein the housing includes a first rotor, a second rotor, and the timing gear. If the cylinder inner radius of the first pump chamber is R and the cylinder inner radius of the second pump chamber is r, and the rotational speed per hour is f, the pump discharge amount per pump shaft length per hour is approximately Formula (1),

3. The high-viscosity fluid pump according to claim 1, wherein the convex curved surface of the first rotor and the concave curved surface of the second rotor are arranged so as to face each other in close proximity to each other.   3. The high-viscosity fluid pump according to claim 1, wherein a pump chamber is formed by a side surface of the timing gear, the convex curved surface of the first rotor, and the concave curved surface of the second rotor.   The high-viscosity fluid pump according to claim 1, further comprising a groove on a side surface of the rotor facing the housing.   The high-viscosity fluid pump according to claim 1, wherein a groove is provided in at least one of the concave curved surface portion and the convex curved surface portion.   The high-viscosity fluid pump according to claim 1, wherein the timing gear is a spur gear.   The curved surface is a part of a cylindrical surface, the convex cross section of the first rotor includes an arc, and the concave cross section of the second rotor includes an arc. A high-viscosity fluid pump according to claim 1.   The high-viscosity fluid pump according to claim 8, wherein the arc is substantially a semicircle.   3. The high-viscosity fluid pump according to claim 1, wherein the concave curved surface portion and the convex curved surface portion are formed in an even number by four on the rotor.   3. The high-viscosity fluid pump according to claim 1, wherein the concave curved surface portion and the convex curved surface portion are each formed in the rotor by six or more.   The high-viscosity fluid pump according to claim 1, wherein the timing gear and the rotor are integrally formed by a lost wax manufacturing method.

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