JP3492238B2 - Vane type fluid motor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small vane type fluid motor that can be used as a power source for an inspection / repair device for pipes used in a thermal power plant, a nuclear power plant or the like.

[0002]

2. Description of the Related Art FIG. 6 shows an exploded state of a conventional vane type fluid motor, and FIG. 7 shows a cross section of the conventional vane type fluid motor.

As shown in FIGS. 6 and 7, a conventional vane type fluid motor includes a casing 101 and a casing 101.
A rotatably supported rotating shaft 102, a rotor 103 fixed to the outer peripheral portion of the rotating shaft 102, and four grooves 104 radially formed on the outer periphery of the rotor 103 in the radial direction. Plural slidable vanes 105 and the vanes 105
The casing 101 is provided with a supply port 107 and a discharge port 108 for supplying and discharging the working fluid to and from the casing 101.

That is, the cylindrical casing 101 is axially divided into three parts, which are composed of a first casing 101a, a second casing 101b and a third casing 101c, which are fastened together by three fixing bolts 109. . Then, in the casing 101, each axial end portion of the rotating shaft 102 is eccentrically supported via bearings 110a and 110b, and the bearings 110a and 110b are fixed screws 111 and spring washers 1.
Fixed by twelve.

As described above, by the outer peripheral surface of the rotor 103, the inner peripheral surface and the end surface of the casing 101, and the plurality of vanes 105, the four air chambers 113a to 113d having a predetermined volume are formed in the respective vanes 105.
Are formed between the rotor 103 and the casing 101 by the same number as the number of the air chambers 113a to 113a by the rotation of the rotor 103.
The volume of d changes.

Therefore, the working fluid under pressure receives the inflow port.
When supplied to 107, the pressure of the working fluid introduced into the space of the air chamber 113d is equal to the pressure of the two vanes.
It acts on 105 but both vanes near the inflow port 107.
Since the protrusion amount of 105 is different, the vane 105 with a large protrusion amount (the upper vane 105 in FIG. 7) receives a larger force than the vane 105 with a small protrusion amount. Therefore, the difference between the received forces becomes a rotational force, the rotor 103 rotates in the direction of the arrow shown in FIG. 7, the rotating shaft 102 concentrically fixed to the rotor 103 rotates, and the rotational force of the rotating shaft 102 is changed. The output functions as a motor.

[0007]

As described above, in the conventional vane type fluid motor, when the working fluid is introduced from the inflow port 107 into each of the air chambers 113a to 113d, the introduced air chamber 113a. The pressure of ~ 113d rises and acts on the vanes 105, so that the rotor 103 and the rotating shaft 102 can rotate.
That is, the pressure energy of the working fluid is converted into rotational energy. However, most of the energy of the working fluid is pressure energy and kinetic energy, but in this conventional vane type fluid motor, the kinetic energy of the working fluid is not effectively utilized and energy efficiency is not good. There was a problem.

The present invention solves such a problem, and an object of the present invention is to provide a vane type fluid motor with improved output efficiency.

[0009]

In order to achieve the above object, a vane type fluid motor according to a first aspect of the present invention is provided with a rotary shaft rotatably supported by a casing and coaxially connected to the rotary shaft. A rotor, a plurality of vanes that are slidable along the radial direction in grooves radially provided on the outer circumference of the rotor along the axial direction, and a supply port and a discharge port for the working fluid provided in the casing. In the vane type fluid motor having a port, guide means for guiding the fluid flowing into the casing from the supply port in the rotation direction of the rotor is provided on the rotor side.

Further, in the vane type fluid motor according to a second aspect of the invention, the guide means is a recess provided on the outer peripheral surface of the rotor.

Further, in the vane type fluid motor of the third aspect of the present invention, the direction of the supply port is made to coincide with the rotation direction of the rotor.

Further, in the vane type fluid motor according to a fourth aspect of the present invention, the supply port is provided on the inner surface of the casing.

Further, in the vane type fluid motor according to a fifth aspect of the present invention, the plurality of vanes are freely movable in each groove of the rotor.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a disassembled state of the vane type fluid motor according to the first embodiment of the present invention, FIG. 2 is a disassembled state of the rotor portion of the vane type fluid motor of this embodiment, and FIG. 3 is a cross section of the vane type fluid motor. Indicates.

The vane type fluid motor of this embodiment is shown in FIG.
As shown in FIG. 3, a casing 11, a rotary shaft 12 rotatably supported by the casing 11, a rotor 13 fixed to the outer peripheral portion of the rotary shaft 12, and a radial shape on the outer periphery of the rotor 13. Four grooves 14a, 1 formed in the
A plurality of vanes 15a, 15b, 15c, 15d which are respectively slidable in the radial direction in 4b, 14c, 14d.
And the coil springs 16a, 16b for pushing the vanes 15a, 15b, 15c, 15d outward from the rotor 13.
16c, 16d, and the casing 11
The casing 11 is provided with a supply port 17 and a discharge port 18 for supplying and discharging the working fluid inside the casing 11.

That is, the cylindrical casing 11 is axially divided into three parts, the first casing 11a and the second casing 11a.
It consists of casing 11b and third casing 11c.
It is integrally fastened by a book fixing bolt 19.
A rotor 13 fixed to the rotary shaft 12 is housed in the casing 11, and one end of the rotary shaft 12 is supported by a bearing 20 at an eccentric position of the first casing 11a. It is fixed by a fixing screw 21. The other end of the rotary shaft 12 is the second
By supporting the bearings 22 on the three casings 11b and 11c and interposing the spring washer 23 for preloading, the end face of the rotor 13 and the casing 11 are
The clearance with the end face of the can be adjusted. In this way, the rotating shaft 12 is rotatably supported by the casing 11, so that the rotor 1 fixed to the rotating shaft 12 is fixed.
The casing 3 can be freely rotated by this casing 11.

On the other hand, as described above, the four grooves 14a, 14b, 1 are formed on the outer peripheral surface of the rotor 13 along the axial direction.
4c and 14d are formed, and these grooves 14a and 14d are formed.
b, 14c and 14d are radially formed from the center of rotation of the rotor 13 at circumferentially equidistant positions. The rotor 1 is placed in each of the grooves 14a, 14b, 14c, 14d.
3 vanes 15a, 15b, which are slidable along the radial direction,
15c and 15d are installed, and each vane 15
The coils a, 15b, 15c and 15d are urged by coil springs 16a, 16b, 16c and 16d mounted in the rotor 13 in a direction to push them outward from the rotor 13.

Therefore, this rotor 13 is
Each of the vanes 15a, 15b, 15 is accommodated in the inside.
c and 15d are coil springs 16a, 16b, 16c and 16
It is urged outward by d and urged, and its tip end is in contact with the inner peripheral surface of the casing 11. Then, in this state, the outer peripheral surface of the rotor 13, the inner peripheral surface and the end surface of the casing 11, and the four vanes 15a, 15b, 15c, and 15d form four air chambers A, B, and C having a predetermined volume. D
Are formed between the rotor 13 and the casing 11 by the same number as the vanes 15a, 15b, 15c, 15d, and the rotation of the rotor 13 changes the volumes of the air chambers A, B, C, D. .

Further, concave portions 24a, 24b, 24c and 24d as guide means are formed on the outer peripheral surface of the rotor 13 and located between the vanes 15a, 15b, 15c and 15d. On the other hand, the above-mentioned supply port 17
Is connected to the supply passage 17a formed in the first casing 11a along the axial direction, and communicates with the supply passage 17a and opens in any of the air chambers A, B, C, D in the casing 11. A plurality of supply openings 17b, second and third casings 11b,
11c is composed of supply holes 17c and 17d formed so as to communicate with the supply passage 17a. By matching the direction of the supply opening 17b with the rotation direction of the rotor 13, the supply port 17 Working fluid supplied to the rotor 13
It is designed to be guided in the direction of rotation. In addition, the discharge port 18 is formed in the first casing 11a in the axial direction in parallel with the supply passage 17a, and the discharge passage 18a communicates with the discharge passage 18a.
A plurality of discharge openings 18b that open to either B, C, or D
And the discharge passage 18a in the second and third casings 11b and 11c.
And discharge holes 18c and 18d formed so as to communicate with each other.

Therefore, the second and third casings 11b, 1
The working fluid supplied from the supply holes 17c and 17d of 1c is
Flows to each of the air chambers A, B, C and D from the respective inlet openings 17b through the inlet passage 17a of the first casing 11a,
With this working fluid, the vanes 15a, 15b, 15c,
The vane type motor can be made to function by rotating any of the rotors 15 and 15d by receiving the rotational force.

The operation of the vane type fluid motor of this embodiment described above will now be described.

As shown in FIG. 1, the working fluid is the second and third working fluids.
It is supplied to the feed passage 17a of the first casing 11a from the feed holes 17c and 17d of the casings 11b and 11c, and flows into the casing 11 from the feed openings 17b through the feed passage 17a. At this time, the working fluid flows into the air chamber C from the supply opening 17b as shown in FIG.
The rotor 13 and the rotary shaft 12 rotate due to the kinetic energy and pressure energy of the working fluid acting on the rotor 13. That is, the working fluid that has flowed into the air chamber C is the recess 24 of the rotor 13.
Since it collides with c and flows toward the vane 15d side, the vane 15d
In addition to receiving the rotational force, the working fluid flows into the air chamber C, so that the pressure rises and the vane 1 has a large pressure receiving area.
The 5d side receives the rotational force, and the rotor 13 rotates together with the rotating shaft 12 by the rotational force obtained by converting the two types of energy.

When the rotor 13 is rotated by the working fluid thus flowing into the air chamber C, the working fluid then flows into the air chamber B and the vane 15c receives the rotational force, and the air chambers A, The working fluid flows in the order of D, and the rotor 13 and the rotating shaft 12 continuously rotate. On the other hand, each air chamber A,
When B, C, and D rotate by a predetermined angle to communicate with the discharge opening 18b and the volume suddenly decreases, the air chambers A, B, C, and
The working fluid in D is discharged from the discharge opening 18b to the discharge passage 18a.
Through the discharge holes 1 of the second and third casings 11b and 11c.
It is discharged from 8c and 18d.

As described above, in the vane type fluid motor of this embodiment, the vane 15a, 15b, which is movable in the radial direction, is supported by the rotor 13 which is rotatably supported together with the rotary shaft 12 in the casing 11. By providing the recesses 24a, 24b, 24c, 24d with the provision of 15c, 15d, the working fluid flowing from the supply port 17 into the air chambers A, B, C, D collides with the recesses 24c and vanes. 1
Acting on 5a, 15b, 15c, 15d, the rotor 13 and the vanes 15a, 15b, 15c, 15d rotate together with the rotary shaft 12 by kinetic energy and pressure energy. Therefore, the energy of the fluid is efficiently converted into a rotational force to improve the output efficiency of the motor. On the other hand, when the rotor 13 rotates, the working fluid in each of the air chambers A, B, C, and D is discharged from the discharge port 18 while its volume is rapidly reduced and becomes high pressure.
Since a, 24b, 24c, and 24d increase the minimum volume, the compression ratio of the working fluid decreases and the back pressure decreases in this discharging process, which suppresses output loss and improves the output efficiency of the motor. improves.

As a result, for example, a diameter of 30 mm and a length of 1
Small size of 00 mm, output of 500 W (supply pressure 6 kgf / c
m ²⁾ and can realize a large air motor output, the inner diameter 10
It can be applied to machining in a pipe of about 0 mm.

FIG. 4 shows a cross section of a vane type fluid motor according to a second embodiment of the present invention. It should be noted that members having the same functions as those described in the above-described embodiment are designated by the same reference numerals, and redundant description will be omitted.

The vane type fluid motor of this embodiment is shown in FIG.
As shown in FIG. 3, the rotary shaft 12 is rotatably supported in the casing 11, and the rotor 31 is fixed to the rotary shaft 12. The four grooves 3 formed on the outer periphery of the rotor 31 are shown in FIG.
2a, 32b, 32c and 32d have vanes 33a and 3
3b, 33c, 33d are slidably mounted along the radial direction, and the vanes 33a, 33b, 3
3c and 33d are urged outward by a coil spring (not shown). Further, the outer peripheral surface of the rotor 31 is located between the vanes 33a, 33b, 33c, 33d, and the concave portion 34 is formed as a guide means to form the blade 3
5a, 35b, 35c and 35d are formed respectively.

The casing 11 is provided with a supply port 17 and a discharge port 18 for supplying and discharging the working fluid to and from the air chambers A, B, C and D of the casing 11.

Therefore, when the working fluid is supplied from the supply port 17 into the casing 11, the working fluid first flows into the air chamber C, and the rotor 31 and the rotating shaft 12 are rotated by the kinetic energy and the pressure energy. To do. In other words, the working fluid that has flowed into the air chamber C is the concave portion 34 of the rotor 31.
Collide with the vanes 33d and the blades 35c from the vanes 3
Since the vane 33d receives the rotational force because it flows to the 3d side, the pressure rises when the working fluid flows into the air chamber C, and the vane 33d side having a large pressure receiving area receives the rotational force. The two types of energy are converted to rotate together with the rotating shaft 12 by the rotating force.
Then, when the rotor 31 rotates, the working fluid becomes air chamber B,
A and D flow in order, and the rotor 13 and the rotary shaft 12 rotate continuously. On the other hand, when the air chambers A, B, C, D are rotated by a predetermined angle to communicate with the exhaust port 18 and the volume is rapidly reduced, the working fluid in the air chambers A, B, C, D is discharged into the exhaust port 18. Emitted from 18.

As described above, in the vane type fluid motor of this embodiment, the rotor 31 is provided with the vanes 33a, 33b, 33c and 33d which are movable in the radial direction, and the blades 35a, 35b, 35
By forming c and 35d, the working fluid flowing from the inlet port 17 into each of the air chambers A, B, C and D acts on the recess 34 and the blades 35a, 35b, 35c and 35d, and the rotor 31 and the vane. 33a, 33b, 33c, 33d will rotate with the rotating shaft 12 by kinetic energy and pressure energy. Therefore, the energy of the fluid is efficiently converted into a rotational force to improve the output efficiency of the motor. On the other hand, when the rotor 31 rotates, the air chambers A, B, C,
The working fluid in D is discharged from the discharge port 18 while its volume is rapidly reduced and becomes high pressure. However, since this minimum volume is large, the compression ratio of the working fluid is reduced and the back pressure is increased in this discharging step. The output loss is suppressed and the output efficiency of the motor is improved.

FIG. 5 shows an exploded state of the rotor portion of the vane type fluid motor according to the third embodiment of the present invention. It should be noted that members having the same functions as those described in the above-described embodiment are designated by the same reference numerals, and redundant description will be omitted.

The vane type fluid motor of this embodiment is shown in FIG.
As shown in FIG. 4, the rotary shaft 12 is rotatably supported in the casing 11, the rotor 41 is fixedly connected to the rotary shaft 12, and the four grooves 4 formed on the outer periphery of the rotor 41 are shown.
2a, 42b, 42c, 42d have vanes 43a, 4
3b, 43c, 43d are slidably mounted along the radial direction, and the vanes 43a, 43d
Recesses 44 are respectively formed as guide means between b, 43c and 43d. In the rotor 41 of the present embodiment, the vanes 43a, 43 are provided as in the above-described embodiments.
b, 43c and 43d are not biased and supported by the coil spring.

Therefore, when the working fluid is supplied into the casing from the supply port (not shown), the kinetic energy and pressure energy of the working fluid are converted into rotational force, and the rotor 41 and the rotary shaft 12 rotate. At this time, since each vane 43a, 43b, 43c, 43d is not biased and supported by the coil spring, each vane 43a, 43
The tips of b, 43c and 43d are not always in contact with the inner surface of the casing, and each air chamber is not a completely closed space. However, the working fluid flowing into the air chamber is
The vanes 43a, 43b, 43
Since it flows to the c, 43d side, these vanes 43a, 43d
The b, 43c, and 43d receive the rotational force and start to rotate though the speed is low. Then, due to the rotation of the rotor 41, a centrifugal force acts on the vanes 43a, 43b, 43c, 43d, and the tip contacts the inner surface of the casing, so that the air chamber becomes a closed space. Therefore, when the working fluid flows into the air chamber, the pressure rises, and the vanes 43a, 43b, 43c, 43d receive the rotational force, and the rotor 41 is rotated by the rotational force obtained by converting the kinetic energy and the pressure energy.
Rotate with 2.

As described above, in the vane type fluid motor of the present embodiment, in addition to the effects of the first embodiment described above, the coil spring that brings the vanes 43a, 43b, 43c, 43d into contact with the inner surface of the casing. Is unnecessary, the number of parts is reduced and the number of assembling steps is also reduced. Further, the tips of the vanes 43a, 43b, 43c, 43d are not always in contact with the inner surface of the casing, and the rotor 4 due to frictional resistance is not required.
No. 1 rotation loss can be reduced and the vanes 43a, 43
The amount of wear of b, 43c, and 43d can be reduced, and the manufacturing cost can be reduced, the efficiency can be improved, and the life can be extended.

The vane type fluid motor of the present invention is not limited to the above-described embodiments in the shape and dimensions of the rotor, the vane, etc., and may be appropriately changed according to the usage situation. .

[0037]

As described above in detail in the embodiments, according to the vane type fluid motor of the invention of claim 1,
A rotor is connected to a rotating shaft that is rotatably supported by a casing, and a plurality of vanes that are slidable in the radial direction are provided in grooves radially provided along the axial direction on the outer periphery of the rotor. Since a supply port and a discharge port for the working fluid are provided on the rotor and guide means for guiding the fluid flowing into the casing from the supply port in the rotation direction of the rotor is provided on the rotor side, the kinetic energy of the fluid The pressure energy can be efficiently converted into a rotational force to rotate the rotary shaft, and the output efficiency of the motor can be improved.

According to the vane type fluid motor of the second aspect of the present invention, since the guide means is a recess provided on the outer peripheral surface of the rotor, the fluid from the supply port can be efficiently provided by this recess with a simple structure. In addition, the output efficiency of the motor can be improved by efficiently guiding the kinetic energy and pressure energy of the fluid into the rotational force and rotating the rotating shaft.

According to the vane type fluid motor of the third aspect of the invention, the direction of the supply port is made to coincide with the rotation direction of the rotor, so that the fluid from the supply port is efficiently directed to the rotation direction of the rotor. The output efficiency of the motor can be improved by efficiently converting the kinetic energy and pressure energy of the fluid into the rotational force to rotate the rotary shaft.

According to the vane type fluid motor of the fourth aspect of the invention, since the supply port is provided on the inner surface of the casing, the fluid from the supply port is efficiently guided by the guide means in the rotational direction of the rotor. It is possible to efficiently convert the kinetic energy and the pressure energy of the fluid into the rotational force to rotate the rotary shaft, thereby improving the output efficiency of the motor.

According to the vane type fluid motor of the fifth aspect of the invention, since the plurality of vanes can be freely moved in the respective grooves of the rotor, the kinetic energy of the fluid is converted into a rotational force. Since the rotary shaft is rotated by rotating the rotary shaft, a biasing member for pressing the vane against the inner surface of the casing is not required, the number of parts can be reduced and the number of assembling steps can be reduced. It is possible to reduce the rotation loss of the rotor and the vane wear amount, and as a result, the manufacturing cost is reduced.
Higher efficiency and longer life can be achieved.

[Brief description of drawings]

FIG. 1 is an exploded state diagram of a vane type fluid motor according to a first embodiment of the present invention.

FIG. 2 is an exploded state diagram of a rotor portion of the vane fluid motor of the present embodiment.

FIG. 3 is a sectional view of a vane type fluid motor.

FIG. 4 is a sectional view of a vane type fluid motor according to a second embodiment of the present invention.

FIG. 5 is an exploded view of a rotor portion of a vane type fluid motor according to a third embodiment of the present invention.

FIG. 6 is an exploded state diagram of a conventional vane type fluid motor.

FIG. 7 is a cross-sectional view of a conventional vane type fluid motor.

[Explanation of symbols]

11 casing 12 rotation axes 13 rotor 14a, 14b, 14c, 14d grooves 15a, 15b, 15c, 15d vanes 16a, 16b, 16c, 16d Coil spring 17 Supply port 17a Air supply passage 17b Air supply opening 18 discharge port 18a discharge path 18b discharge opening 24a, 24b, 24c, 24d Recesses (guide means) 31 rotor 32a, 32b, 32c, 32d grooves 33a, 33b, 33c, 33d vanes 34 Recess (guide means) 35a, 35b, 35c, 35d blades (guide means) 41 rotor 42a, 42b, 42c, 42d grooves 43a, 43b, 43c, 43d vanes 44 recess (guide means) A, B, C, D air chamber

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-6-207581 (JP, A) JP-A-3-229993 (JP, A) JP-A-8-261810 (JP, A) Special table Sho-60- 500631 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F03C 2/30

Claims (5)

(57) [Claims] 1. A rotary shaft rotatably supported by a casing, a rotor coaxially connected to the rotary shaft, and a radial direction in a groove radially provided on the outer circumference of the rotor along the axial direction. In a vane type fluid motor having a plurality of vanes slidable along and a supply port and a discharge port for a working fluid provided in the casing, a fluid flowing from the supply port into the casing A vane type fluid motor, wherein guide means for guiding the rotor in the rotating direction is provided on the rotor side. 2. The vane fluid motor according to claim 1, wherein the guide means is a recess provided on the outer peripheral surface of the rotor. 3. The vane fluid motor according to claim 2, wherein the direction of the feed port is made to coincide with the rotation direction of the rotor. 4. The vane fluid motor according to claim 1, wherein the supply port is provided on an inner surface of the casing. 5. The vane fluid motor according to claim 1, wherein the plurality of vanes are freely movable in each groove of the rotor.