JP6341908B2 - Positive displacement pump - Google Patents

Description

  The present invention relates to a positive displacement pump that sucks and discharges fluid by changing the volume of a pump chamber using an eccentric drive member.

  A positive displacement pump that sucks and discharges fluid by changing its volume sucks fluid from the suction port while increasing the volume of the pump chamber, and discharges fluid from the discharge port while decreasing the volume of the pump chamber. As one of such positive displacement pumps, an arc-shaped pump chamber is divided into an inner pump chamber and an outer pump chamber by an arc-shaped partition formed on an eccentric disk (eccentric drive member). There is known a positive displacement pump using an eccentric disk that realizes a discharge flow rate substantially free of pulsation by shifting the phase of the change in the discharge flow rate by 180 ° (Non-Patent Document 1).

http://www.psgdover.com/en/mouvex/mouvexproducts/eccentric-disc-pumpsmouvex-technology/a-series-pumps

  However, the conventional positive displacement pump described above has a problem in durability because a thrust load is applied by the pressure in the pump chamber.

  This invention is made | formed in view of such a subject, and it aims at providing the positive displacement pump which can reduce a thrust load.

  The positive displacement pump according to the present invention includes a rotary shaft, an eccentric drive member that is eccentrically mounted on the rotary shaft, and moves along an annular path centering on the rotary shaft in accordance with a rotational operation of the rotary shaft, A first cylinder disposed on one side of the eccentric drive member in the rotational axis direction and forming a first pump chamber together with the eccentric drive member; and a first cylinder disposed on the other side of the eccentric drive member in the rotational axis direction. A second cylinder that forms a second pump chamber together with the eccentric drive member; a suction port for introducing fluid into the first pump chamber and the second pump chamber; and the first and second pump chambers. And a pump head having a discharge port for discharging fluid.

  According to the positive displacement pump according to the present invention, the pump chambers are formed on both sides in the rotational axis direction of the eccentric drive member, so that the thrust load generated by each pump chamber is in the opposite direction, and is just offset. The generation of thrust load can be reduced. Thereby, since it becomes possible to maintain between the eccentric drive member and the 1st and 2nd cylinder in a non-sliding state, generation | occurrence | production of a contamination can be prevented.

  As an embodiment of the present invention, the eccentric drive member includes a first disk member and a second disk member that are coaxially arranged, and the first cylinder rotates with the first disk member. The first pump chamber having an annular shape or a circular arc shape is formed opposite to one side in the axial direction together with the first disk member, and the second cylinder is connected to the second disk member in the rotational axis direction. The second pump chamber can be configured so as to face the other side and form an annular or arcuate second pump chamber together with the second disk member.

  Further, the first disk member includes a first partition that divides a first pump chamber into a first inner pump chamber and a first outer pump chamber on a surface facing the first cylinder; A first inner pump chamber discharge port communicating with the discharge port and the first inner pump chamber; and a first outer pump chamber discharge port communicating with the discharge port and the first outer pump chamber; The second disk member includes a second partition wall that divides a second pump chamber into a second inner pump chamber and a second outer pump chamber on a surface facing the second cylinder, and the discharge port. And a second inner pump chamber discharge port communicating with the second inner pump chamber, and a second outer pump chamber discharge port communicating with the discharge port and the second outer pump chamber, 1 cylinder includes the suction port, the first inner pump chamber, and the first outer port. A second pump chamber communicating with the suction port, the second inner pump chamber, and the second outer pump chamber. It can also be configured to have a suction port.

  Furthermore, the change in the discharge flow rate from the first inner pump chamber and the first outer pump chamber due to the movement of the eccentric drive member along the annular path is reversed, and the second inner pump chamber The change in the discharge flow rate from the second outer pump chamber may be reversed. Flow pulsation can be reduced.

  Further, for example, the change in the discharge flow rate from the first inner pump chamber and the second inner pump chamber due to the movement of the eccentric drive member along the annular path is reversed, and the first outer Changes in the discharge flow rate from the pump chamber and the second outer pump chamber may be reversed. Thereby, the pulsation of the flow rate can be further reduced and theoretically eliminated.

  In addition, for example, the first outer pump may have the same phase as a change in discharge flow rate from the first inner pump chamber and the second inner pump chamber due to the movement of the eccentric drive member along the annular path. The change in discharge flow rate from the chamber and the second outer pump chamber may be in phase. As a result, the suction port and the discharge port can be arranged at the same phase position in the rotation direction in the first pump chamber and the second pump chamber. There is an advantage that maintenance such as processing becomes easy.

  Further, the first disk member and the second disk member may be independently formed so as to be position-adjustable. Thereby, the position of the first disk member and the second disk member can be independently or automatically adjusted without strictly managing the processing accuracy and assembly accuracy of the disk member and cylinder. As compared with the case where both are integrated, the processing accuracy management and the assembly accuracy management become easier, and the positive displacement pump can be manufactured more easily.

  The positive displacement pump is coupled to the distal end of the rotational shaft so that the position in the rotational axis direction can be adjusted, and the first disk member and the second disk member are mounted, and the second disk is disposed on the proximal end side. An eccentric shaft having a first positioning portion for defining a position of the member in the rotation axis direction, and a position of the first disk member in the rotation axis direction coupled to the tip of the eccentric shaft so that the position of the rotation axis direction can be adjusted. You may provide the attachment member which has the 2nd positioning part to prescribe | regulate, and the drive side rotating shaft part drive side rotating shaft part front end side rotating shaft part front end side rotating shaft part cap member. Front end side rotation shaft portion Drive side rotation shaft portion Cap member Front end side rotation shaft portion This allows the first disk and the second disk to be individually adjusted in the direction of the rotation axis and assembled. Clearance management suitable for the characteristics becomes possible, and a positive displacement pump with higher pump efficiency can be provided.

  The first disk member and the second disk member may be independently rotatable in a predetermined angle range. This enables automatic position adjustment in the rotational direction between the first disk member and the first cylinder and between the second disk member and the second cylinder. It is possible to easily prevent the occurrence of problems such as noise and wear due to contact.

  The first cylinder includes a first fluid path for communicating the suction port and the first pump chamber suction port, and the second cylinder includes the suction port and the second pump chamber suction port. A second fluid path that communicates the mouth may be provided. Further, the position of the first pump chamber suction port communicating with the first fluid path and the position of the second pump chamber suction port communicating with the second fluid path are rotations of the rotating shaft. You may substantially agree in the direction. Thus, for example, when the transfer target is a liquid, the transfer target can be sucked into the first and second pump chambers from the lower ends of the first and second fluid paths, and the liquid is supplied to the first and second fluids. Can be suitably discharged from the fluid path.

It is a front view which notches and shows a part of positive displacement pump which concerns on 1st embodiment of this invention. It is sectional drawing which looked at the same volume type pump from the side surface direction. It is a disassembled perspective view of the positive displacement pump. It is a side view of the eccentric drive member 2 of the positive displacement pump. It is a front view of the eccentric drive member 2 and the 3rd pump head 5 of the positive displacement pump. It is a rear view of the eccentric drive member 2 and the 3rd pump head 5 of the positive displacement pump. It is a rear view of the 1st pump head 3 of the same volume type pump. It is a front view of the 2nd pump head 4 of the same volume type pump. It is a figure which shows the mode of the 1st pump chamber at the time of operation | movement of the same volume type pump. It is a figure which shows the mode of the 2nd pump chamber at the time of the operation | movement. It is a graph which shows the relationship between the flow volume of the same volume type pump, and the angle of the rotating shaft 11. FIG. It is a front view which notches and shows a part of positive displacement pump which concerns on 2nd embodiment of this invention. It is sectional drawing which looked at the same volume type pump from the side surface direction. It is a disassembled perspective view of the positive displacement pump. It is a sectional side view of the eccentric drive member of the positive displacement pump. It is a front view of the 1st disc member 24 of the positive displacement pump. It is a rear view of the 1st disc member 24 of the positive displacement pump. It is a rear view of the 2nd disc member 25 of the positive displacement pump. It is a sectional side view which shows the adjustment method of the position of the 1st disk member 24 and the 2nd disk member 25 of the same volume type pump. It is a sectional side view which shows the same method. It is sectional drawing which looked at the positive displacement pump which concerns on 3rd embodiment of this invention from the side surface direction. It is a front view of the eccentric drive member 2 and the 3rd pump head 5 of the positive displacement pump. It is a rear view of the eccentric drive member 2 and the 3rd pump head 5 of the positive displacement pump. It is a rear view of the 1st pump head 3 of the same volume type pump. It is a front view of the 2nd pump head 4 of the same volume type pump.

  Hereinafter, a positive displacement pump according to an embodiment of the present invention will be described in detail with reference to the drawings.

[First embodiment]
[overall structure]
FIG. 1 is a front view showing a part of the positive displacement pump according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of the positive displacement pump as viewed from the side. FIG. 3 is an exploded perspective view of the same displacement pump.

  The positive displacement pump according to the present embodiment includes a rotation driving force transmission unit 1 centering on a rotation shaft 11 that transmits a rotation driving force from a rotation driving source such as a motor (not shown), and a rotation shaft of the rotation driving force transmission unit 1. 11, the disk-shaped eccentric drive member 2 mounted in an eccentric state is opposed to the front side in the rotational axis direction of the eccentric drive member 2 and is supplied with fluid from the first flow path. The first pump head 3 forming one pump chamber 6 faces the rear side of the eccentric drive member 2 in the direction of the rotation axis, and is supplied with fluid from the second flow path. A second pump head 4 that forms the pump chamber 7 and a third pump head 5 that is sandwiched between the first pump head 3 and the second pump head 4 and accommodates the eccentric drive member 2 therein. . The rotational driving force transmission unit 1, the first pump head 3, the second pump head 4, and the third pump head 5 include bolts 61 that pass through the bolt through holes 319, 329, 519, and 419 shown in FIG. It is fixed by the register mark screw 62. The front surface of the first pump head 3 is covered with a front cover 34.

  The rotational driving force transmission unit 1 includes a rotation shaft 11 and a bearing portion 17 that rotatably supports the rotation shaft 11. The bearing portion 17 is composed of a pair of tapered roller bearings 171 and 172 that are arranged in plane symmetry to receive loads in the radial direction and the thrust direction (axial direction). These tapered roller bearings 171 and 172 are accommodated inside a cylindrical bearing casing 122 and the inside is sealed by seal members 173 and 174 disposed at both ends. The front end of the bearing casing 122 is fixed to the flange 121, and is fixed to the second pump head 4 via the flange 121. Further, an attachment portion 13 for attaching the positive displacement pump to a fixed portion such as a floor surface or a wall surface is fixed to the flange 121.

  A mechanical seal 14 is attached to the rotating shaft 11. A portion of the rotary shaft 11 arranged inside the first to third pump heads 3 to 5 is an eccentric shaft 15 that is eccentric with respect to the rotary shaft 11. The eccentric drive member 2 is rotatably mounted on the eccentric shaft 15 via a bearing 16. Thereby, the eccentric drive member 2 moves along an annular path centering on the rotation shaft 11 as the rotation shaft 11 rotates.

  FIG. 4 is a side view of the eccentric drive member 2. FIG. 5 is a front view of the eccentric drive member 2 housed in the third pump head 5, and FIG. 6 is a rear view of the same. The eccentric drive member 2 includes a first disk member 22 and a second disk member 23 that are coaxially arranged, and a connecting portion 21 that connects them. The first disk member 22 and the second disk member 23 are formed with bearing cylinders 221 and 231 each having an insertion hole 211 formed in the center for mounting on the eccentric shaft 15 via the bearing 16 (FIG. 2). Has been. The axially outer surfaces of the first and second disk members 22 and 23 form a first pump chamber 6 and a second pump chamber 7 together with a first cylinder 312 and a second cylinder 412 described later, respectively. It functions as pump chamber forming surfaces 223, 224, 233, 234. The first and second disk members 22 and 23 have C-shaped or arc-shaped first partition walls 222 arranged on the outer surfaces in the axial direction of the first and second disk members 22 and 23 with the positions of their open ends shifted by 180 °. The second partition walls 232 are provided so as to protrude outward in the axial direction. The first partition 222 and the second partition 232 are provided between the bearing cylinders 221 and 231 and the outer peripheral edges of the disk members 22 and 23 on the outer surfaces of the first and second disk members 22 and 23, respectively. Is formed coaxially with the insertion hole 211 at an intermediate position in the radial direction. In addition, the first disk member 22 and the second disk member 23 are respectively close to the open ends of the first partition 222 and the second partition 232 at the inner and outer positions sandwiching the partition walls 222 and 232. , 23 and inner pump chamber discharge ports 225, 235 and outer pump chamber discharge ports 226, 236 are formed, respectively. The discharge ports 225 and 226 formed in the first disk member 22 and the discharge ports 235 and 236 formed in the second disk member 23 are also formed at positions shifted from each other by 180 °.

  FIG. 7 is a rear view of the first pump head 3. The first pump head 3 includes a first frame 31 and a second frame 32 (see FIGS. 2 and 3). The first frame 31 has a first bearing cylinder housing port 311 for housing the bearing cylinder 221 (FIG. 5) in the center, and a first partition 222 (FIG. 5) on the outside thereof. A first cylinder 312 that forms a C-shaped or arc-shaped first pump chamber 6 is formed. Further, a facing surface 314 facing the pump chamber forming surface 224 (FIG. 5) is formed on the outer periphery thereof, and an outer peripheral flange 315 is formed on the outer side thereof. A frame portion 313 between the first bearing cylinder housing port 311 and the first cylinder 312 is coupled to the facing surface 314 of the first frame 31 via a connecting portion 316. The position of the connecting portion 316 corresponds to the position of the open end of the first partition 222 of the eccentric drive member 2. Further, as shown in FIG. 7, a bolt through hole 319 is formed in the outer peripheral flange 315.

  As shown in FIG. 7, the pump chamber forming surface 323 that forms the first pump chamber 6 of the second frame 32 is formed with a suction port 322 that penetrates the second frame 32 at a position near the connecting portion 316. ing. The suction port 322 and the discharge ports 225 and 226 (FIG. 5) of the eccentric drive member 2 are disposed on the opposite sides with respect to the connecting portion 316. As shown in FIG. 2, a first fluid path 321 is formed in the second frame 32, and the first fluid path 321 and the suction port 322 communicate with each other. The upper end of the first fluid channel 321 is closed by a cap 33 so as to be opened and closed.

  FIG. 8 is a front view of the second pump head 4. The second pump head 4 is configured in substantially the same manner except that the positional relationship with the first pump head described above is different by 180 °. That is, the second pump head 4 includes a third frame 41. The third frame 41 has a second bearing cylinder accommodating port 411 that penetrates the third frame 41 at the center and accommodates the bearing cylinder 231 (FIG. 6), and a second partition wall on the outside thereof. A second cylinder 412 that accommodates 232 (FIG. 6) and forms a C-shaped or arc-shaped second pump chamber 7 is formed. Further, an opposing surface 415 facing the pump chamber forming surface 234 (FIG. 6) is formed on the outer periphery thereof, and an outer peripheral flange 410 is formed on the outer side thereof. A frame portion 413 between the second bearing cylinder housing port 411 and the second cylinder 412 is coupled to the facing surface 415 of the third frame 41 via a connecting portion 418. The position of the connecting portion 418 corresponds to the position of the open end of the second partition wall 232 of the eccentric drive member 2. Further, as shown in FIG. 8, a bolt through hole 419 is formed in the outer peripheral flange 410.

  As shown in FIG. 8, the pump chamber forming surface 414 that forms the second pump chamber 7 of the third frame 41 has a second fluid path 416 ( A suction port 417 communicating with FIG. 2) is formed. The suction port 417 and the discharge ports 235 and 236 (FIG. 6) of the eccentric drive member 2 are disposed on the opposite sides with respect to the connecting portion 418. As shown in FIG. 2, a second fluid path 416 is formed in the third frame 41, and the second fluid path 416 and the suction port 417 communicate with each other. The upper end of the second fluid channel 416 is closed by a cap 42 so as to be opened and closed.

  As shown in FIGS. 1 to 3, the third pump head 5 has a suction port 512 that introduces a transfer fluid (liquid or gas) at the upper end, and a fluid from the suction port 512 to the first fluid path. A fluid branch path 513 for branching and feeding to 321 and the second fluid path 416 is provided. The fluid branch path 513 is connected to the first fluid path 321 and the second fluid path 416 via sealed joints 52 and 53. The space in which the eccentric drive member 2 of the third pump head 5 is accommodated becomes a discharge fluid flow path 511 in which the transfer fluid discharged from the first and second pump chambers 6 and 7 is accommodated. The third pump head 5 is formed with a discharge port 514 that communicates with the discharge fluid flow path 511 and discharges the transfer fluid to the outside.

[Operation]
Next, the operation of the positive displacement pump according to the present embodiment will be described. When a rotational driving force is applied to the rotating shaft 11 by a rotational driving source such as a motor, the rotational motion is transmitted to the eccentric shaft 15, and the eccentric driving member 2 has a radius corresponding to the amount of eccentricity around the central axis of the rotating shaft 11. Move along the circular path of. Since the eccentric drive member 2 is rotatably attached to the eccentric shaft 15 via the bearing 16, the annular drive member 2 itself is coupled with the rotation of the eccentric drive member 2 being restricted. Move in parallel along the route. The parallel movement for one rotation along this circular orbit is one cycle of the pump.

  FIG. 9 is a diagram showing the position of the eccentric drive member 2 in the first pump chamber 6 at each time point of one cycle of the same displacement pump, and FIG. 10 is also the eccentric drive member 2 in the second pump chamber 7. FIG. As is clear from these drawings, the first partition 222 divides the first pump chamber 6 into a first inner pump chamber 6a and a first outer pump chamber 6b on the inner peripheral side and the outer peripheral side, The second partition 232 divides the second pump chamber 7 into a second inner pump chamber 7a and a second outer pump chamber 7b on the inner peripheral side and the outer peripheral side.

  9 and 10 show a state in which the eccentric drive member 2 moves counterclockwise when viewed from the front, and the center position of the eccentric drive member 2 is shown in FIGS. 9 (a) and 10 (a). 9 (b) and 10 (b) at a position of 90 °, FIGS. 9 (c) and 10 (c) at a position of 180 °, and FIGS. 9 (d) and 10 (b). In (d), each is located at a position of 270 °. FIG. 11 is a graph showing a change in the discharge amount of the transfer fluid from each pump chamber.

  When the eccentric drive member 2 is positioned at 0 ° shown in FIG. 9A, the discharge flow rate of the transfer fluid from the discharge port 225 of the first inner pump chamber 6a reaches the minimum value, and the first outer pump The discharge flow rate of the transfer fluid from the discharge port 226 of the chamber 6b reaches the maximum value. Further, the suction through the suction port 322 to the first inner pump chamber 6a is started.

  At the stage where the eccentric drive member 2 passes through the 90 ° position shown in FIG. 9B, the discharge flow rate of the transfer fluid from the discharge port 225 of the first inner pump chamber 6a reaches the maximum value from the minimum value. In the middle stage, the discharge flow rate of the transfer fluid from the discharge port 226 of the first outer pump chamber 6b is in the middle stage from the maximum value to the minimum value. The amount of suction through the suction port 322 into the first inner pump chamber 6a is increasing.

  At the stage where the eccentric drive member 2 passes through the 180 ° position shown in FIG. 9C, the discharge flow rate of the transfer fluid from the discharge port 225 of the first inner pump chamber 6a reaches the maximum value, The discharge flow rate of the transfer fluid from the discharge port 226 of the outer pump chamber 6b reaches the minimum value. Moreover, the suction via the suction port 322 to the first outer pump chamber 6b is started.

  On the other hand, when the eccentric drive member 2 is positioned at 0 ° shown in FIG. 10A, the discharge flow rate of the transfer fluid from the discharge port 235 of the second inner pump chamber 7a reaches the maximum value, and the second The discharge flow rate of the transfer fluid from the discharge port 236 of the outer pump chamber 7b has reached the minimum value. Suction via the suction port 417 to the second outer pump chamber 7b is started.

  At the stage where the eccentric drive member 2 passes through the 180 ° position shown in FIG. 10C, the discharge flow rate of the transfer fluid from the discharge port 235 of the second inner pump chamber 7a reaches the minimum value, and the second The discharge flow rate of the transfer fluid from the discharge port 236 of the outer pump chamber 7b reaches the maximum value. Suction via the suction port 417 to the second inner pump chamber 7a is started.

  As shown in FIG. 11, the change in the discharge flow rate from the first inner pump chamber 6a and the change in the discharge flow rate from the first outer pump chamber 6b have a phase difference of 180 ° from each other. However, since the flow rate from the first outer pump chamber 6b is slightly larger than the flow rate from the first inner pump chamber 6a due to the pump volume and the like, the discharge flow rate of the first pump chamber 6 is Slight pulsation will occur. Similarly, the change in the discharge flow rate from the second inner pump chamber 7a and the change in the discharge flow rate from the second outer pump chamber 7b are 180 ° out of phase with each other. However, since the flow rate from the second outer pump chamber 7b is slightly larger than the flow rate from the second inner pump chamber 7a due to the pump volume and the like, the discharge flow rate of the second pump chamber 7 is Slight pulsation will occur. However, in the present embodiment, the flow rate change in the first pump chamber 6 and the flow rate change in the second pump chamber 7 are in a phase different by 180 °. Therefore, by adding up the flow rate from the first pump chamber 6 and the flow rate from the second pump chamber 7, it is possible to realize the supply of fluid without pulsation.

  Moreover, in the capacity | capacitance pump which concerns on this embodiment, suction is always performed by the 1st pump chamber and the 2nd pump chamber, and it arises by the force produced by the suction of the 1st pump chamber, and the suction of the 2nd pump chamber. The force is in the opposite direction. Therefore, it is possible to reduce the load on the crankshaft (rotating shaft 11) in the axial direction, and to reduce the burden on the tapered roller bearings 171 and 172 (bearings) shown in FIG. Therefore, it is possible to apply small bearings as the tapered roller bearings 171 and 172, and it is possible to keep the pump chamber periphery in a substantially complete non-sliding state, thereby effectively preventing contamination. It is possible to suppress.

  For this reason, when the transfer fluid is air, it is possible to provide a high-performance air compressor by driving the rotary shaft 11 to rotate at a high speed.

  Of course, the rotation direction can be reversed, and the suction and discharge are reversed when the rotation is reversed.

[Second Embodiment]
[Constitution]
Next, a positive displacement pump according to a second embodiment of the present invention will be described. FIG. 12 is a front view of the positive displacement pump according to the second embodiment of the present invention, with a part thereof cut away, and FIG. 13 is a cross-sectional view as seen from the side of the positive displacement pump. FIG. 14 is an exploded perspective view of the positive displacement pump.

  For example, as shown in FIG. 14, the positive displacement pump according to the present embodiment includes a first disk member 24 and a second disk formed independently so as to divide the eccentric drive member 2 into two in the axial direction. The eccentric drive member 2 is configured by combining the first disk member 24 and the second disk member 25 in the rotation axis direction. Further, the positive displacement pump according to the present embodiment is configured to be able to adjust the position of the first disk member 24 and the second disk member 25 in the rotation axis direction with respect to the rotation shaft 18 and the eccentric shaft 15. The positive displacement pump according to this embodiment is configured in the same manner as the positive displacement pump according to the first embodiment in other aspects.

  For example, as shown in FIG. 13, the rotary shaft 18 and the eccentric shaft 15 of the positive displacement pump according to the present embodiment include a drive-side rotary shaft portion 180 that transmits a rotation operation, and a rotary shaft on the tip side of the drive-side rotary shaft portion 180. Rotating to the distal end side of the eccentric shaft 15 and the distal end side rotational shaft portion 181 that is coupled from the direction and the eccentric shaft 15 is integrally formed on the distal end side and the position of the rotational axis direction can be adjusted with respect to the drive side rotational shaft portion 180. A cap member (attachment member) 191 that is coupled from the axial direction and can adjust the position of the eccentric shaft 15 in the rotational axis direction.

  The drive-side rotating shaft portion 180 is a shaft that transmits a rotational driving force from a rotational driving source such as a motor (not shown), and is rotatably supported by the above-described bearing portion 17 as shown in FIG. In addition, the mechanical seal 14 is attached to the drive side rotation shaft portion 180. A front portion of the drive side rotation shaft portion 180 is formed in a substantially cylindrical shape, and a front end side rotation shaft portion 181 is slidably inserted into the front portion.

  For example, as shown in FIG. 13, the distal end side rotation shaft portion 181 is a substantially cylindrical member coaxial with the distal end portion of the drive side rotation shaft portion 180. The rear end of the eccentric shaft 15 protrudes in the outer circumferential direction with respect to the rotating shaft, and abuts against the back surface of the second disk member 25 via the bearing 16, thereby positioning the second disk member 25 in the rotating shaft direction. A positioning portion 182 for performing the above is formed. Further, for example, as shown in FIG. 14, the rear end portion of the distal end side rotation shaft portion 181 is divided into a plurality of segments 184 by a plurality of slits 183, and the collet chuck is formed together with the collet 186 and the drawbar 188 formed in a tapered shape. It is composed. Moreover, as shown in FIG. 13, the drawbar insertion hole 187 which penetrates these along the rotating shaft is formed in the front end side rotating shaft part 181 and the eccentric shaft 15. As shown in FIG.

  The cap member 191 is a cap that is inserted from the front into the front portion of the eccentric shaft 15 as shown in FIG. Further, the front end of the cap member 191 protrudes in the outer circumferential direction with respect to the eccentric shaft 15 and abuts against the front surface of the first disk member 24 via the bearing 16, whereby the rotation direction of the first disk member 24 A positioning portion 192 for performing positioning is formed. For example, as shown in FIG. 14, the rear end portion of the cap member 191 is divided into a plurality of segments 194 by a plurality of slits 193, and constitutes a collet chuck together with the collet 196 and the drawbar 198 formed in a tapered shape. Yes. As shown in FIG. 13, the cap member 191 is formed with a draw bar insertion hole 197 that penetrates the cap member 191 along the rotation axis direction.

  FIG. 15 is a side sectional view of the eccentric drive member 2 according to the present embodiment. FIG. 16 is a front view of the first disk member 24 of the eccentric drive member 2, FIG. 17 is a rear view of the first disk member 24, and FIG. 18 is a rear view of the second disk member 25.

  As shown in FIG. 15, the eccentric drive member 2 according to this embodiment includes a first disk member 24 and a second disk member 25 that are formed independently of each other. At the center of the first disk member 24 and the second disk member 25, the first disk member 24 and the second disk member 25 are mounted on the eccentric shaft 15 via the bearing 16 (FIG. 13). Insertion holes 240 and 250 are formed.

  Further, as shown in FIG. 15, the first disk member 24 and the second disk member 25 are provided with coupling base portions 201 and 206 projecting from each other on the opposing surface side, and these coupling base portions 201 and 206 are in a predetermined state. Opposite through an interval. The coupling base portion 206 formed on the front surface of the second disk member 25 is formed with a guide pin locking hole 207 for locking the guide pin 26 and a spring locking hole 208 for locking the spring 27. . Furthermore, a guide pin locking hole 202 for locking the guide pin 26 and a spring locking hole 203 for locking the spring 27 are also formed in the coupling base portion 201 formed on the back surface of the first disk member 24. Yes. Here, the inner diameter of the guide pin locking hole 202 is formed larger than the outer diameter of the guide pin 26. That is, the first disk member 24 and the second disk member 25 have a so-called backlash with respect to the rotation direction, and can rotate independently within a predetermined angle range. The angles of the first disk member 24 and the second disk member 25 are adjusted to a naturally suitable position during the operation of the eccentric disk pump. Note that, as shown in FIG. 17, the spring locking holes 203 and the guide spring locking holes 202 are provided approximately equally from the center of the insertion hole 240 for each predetermined angle.

  As shown in FIG. 16, the first disk member 24 according to the present embodiment is formed in the same manner as the first disk member 22 according to the first embodiment in other points. Similarly, as shown in FIG. 18, the second disk member 25 according to the present embodiment is also formed in the same manner as the second disk member 23 according to the first embodiment in other points. That is, as shown in FIGS. 16 and 18, the first disk member 24 and the second disk member 25 are formed with insertion holes 240 and 250 at the center. The axially outer surfaces of the first and second disk members 24, 25 function as pump chamber forming surfaces 243, 244, 253, 254, respectively. Further, the first and second disk members 24, 25 have C-shaped or arc-shaped first partition walls 242 disposed on the outer surfaces in the axial direction of the first and second disk members 24, 25 with the positions of the open ends thereof being shifted by 180 °, respectively. Each of the second partition walls 252 protrudes outward in the axial direction. The first partition 242 and the second partition 252 are formed between the bearing cylinders 241 and 251 and the outer peripheral edges of the disk members 24 and 25 on the outer surfaces of the first and second disk members 24 and 25, respectively. Are formed coaxially with the insertion holes 240 and 250 at an intermediate position in the radial direction. In addition, the first disk member 24 and the second disk member 25 have disk members 24 at inner and outer positions sandwiching the partition walls 242 and 252, respectively, near the open ends of the first partition wall 242 and the second partition wall 252. , 25, inner pump chamber discharge ports 245 and 255 and outer pump chamber discharge ports 246 and 256 are respectively formed. The discharge ports 245 and 246 formed in the first disk member 24 and the discharge ports 255 and 256 formed in the second disk member 25 are also formed at positions shifted from each other by 180 °.

[Adjustment of Position of First Disk Member 24 and Second Disk Member 25]
In the positive displacement pump according to the present embodiment, the positions of the first disk member 24 and the second disk member 25 can be adjusted. The method will be described below.

  First, as shown in FIG. 19, the bearing 16 and the second disk member 25 are firmly attached to the eccentric shaft 15 so that the back surface of the second disk member 25 abuts the positioning portion 182. 25, the front end side rotary shaft portion 181 is inserted into the front end of the drive side rotary shaft portion 180 with the target clearance secured in advance between the second pump head 4 and the draw bar insertion hole 187. The drawbar 188 is rotated, thereby tightening the collet 186 forward. Thereby, the segment 184 is pressed in the outer circumferential direction by the side surface of the collet 186 formed in a tapered shape, and the positional relationship between the front end side rotating shaft portion 181 and the front end portion of the driving side rotating shaft portion 180 is fixed. In order to set the clearance, for example, a spacer of several tens of μm is inserted between the front surface of the opposing surface 415 of the second pump head 4 and the pump chamber forming surface 254 of the second disk member 25, and after positioning, The disc member 25 may be pulled out slightly forward to pull out the spacer.

  Note that when the front end side rotary shaft portion 181 is pushed into the front portion of the drive side rotary shaft portion 180, the collet 186 is tightened to some extent by the draw bar 188 in advance, and the front end side rotary shaft portion 181 is frictionally applied to the drive side rotary shaft portion 180. You may adjust the power.

  Next, as shown in FIG. 20, the guide pin 26 and the spring 27 are assembled to the second disk member 25, and the bearing 16 and the first disk are mounted on the front portion of the eccentric shaft 15 with the second disk member 25 assembled. The member 24 is assembled, and the third pump head 5 is assembled to the third frame 41.

  Subsequently, as shown in FIG. 20, the first frame is formed with a spacer or the like for securing a predetermined clearance between the first disk member 24 and the first frame 31 as described above. In this state, the cap member 191 is inserted into the front portion of the eccentric shaft 15. Next, the draw bar 198 is rotated through the draw bar insertion hole 197 of the cap member 191, thereby tightening the collet 196 forward. Accordingly, the segment 194 is pressed in the outer circumferential direction by the side surface of the collet 196 formed in a tapered shape, and the positional relationship between the cap member 191 and the front end portion of the eccentric shaft 15 is fixed. Next, the spacer is pulled out by removing the first frame 31 or the like.

  By the above processing, the clearance between the first disk member 24 and the first frame 31 and the clearance between the second disk member 25 and the third frame 41 can be suitably adjusted.

  When the rear portion of the cap member 191 is pushed into the front portion of the eccentric shaft 15, the collet 196 may be tightened to some extent by the draw bar 198 in advance to adjust the frictional force of the cap member 191 with respect to the eccentric shaft 15. .

  The positive displacement pump according to the present embodiment has the following effects. For example, as shown in FIG. 4, the eccentric drive member 2 according to the first embodiment is formed by integrally forming the first disk member 22 and the second disk member 23, and requires advanced processing technology for the formation. May be. In particular, the distance between the first and second disk members 24 and 25 and the first and second cylinders 312 and 412 greatly affects the transfer performance of the positive displacement pump. For example, if this interval is too wide, the transfer capability may be reduced. On the other hand, when the interval is too narrow, the first and second disk members 24 and 25 slide on the first and second cylinders 312 and 412, and the friction coefficient therebetween increases, and the eccentric drive member 2. This may hinder the movement of the material, leading to a decrease in transfer capability. In addition, contamination may occur in the sliding portion.

  Here, depending on the conditions for driving the positive displacement pump, a suitable distance between the first and second disk members 24 and 25 and the first and second cylinders 312 and 412 may change. For example, when the positive displacement pump is operated at a high temperature, it is necessary to consider the thermal expansion of the eccentric drive member 2 and the like. Further, when the object to be transferred is a liquid, the preferable interval varies depending on the viscosity of the liquid.

  In this regard, in the positive displacement pump according to the present embodiment, the positions of the positioning portions 182 and 192 with respect to the rotation axis direction are adjusted, and thereby the distance between the first disk member 24 and the second disk member 25 is adjusted. It is possible to do. Therefore, a highly versatile positive displacement pump capable of suitably adjusting the distance between the first and second disk members 24 and 25 and the first and second cylinders 312 and 412 according to conditions. Can be provided.

  Further, as in the present embodiment, when the first disk member 24 and the second disk member 25 are formed independently, and when both are loosely coupled, the angle between the two is larger than when the two are formed integrally. Increased tolerance for directional errors. For example, in the case of an integrated type, the positional accuracy of the open ends of the first partition 222 and the second partition 232 and the positional accuracy of the cylinder side coupling portions 316 and 414 that engage with the open ends are not secured. May cause contact, wear, noise, etc., which may affect the preferred operation of the positive displacement pump. In this regard, the positive displacement pump according to the present embodiment is configured such that the first disk member 24 and the second disk member 25 can be independently rotated within a predetermined angle range. In such an embodiment, the rotation angles of the first and second disk members 24, 25 relative to the first and second cylinders 312 and 412 are suitably adjusted during operation. Therefore, the first disk member 24 and the second disk member 25 according to the present embodiment do not need to precisely adjust the rotation angle with respect to each other, and can be easily manufactured.

[Third Embodiment]
Next, a positive displacement pump according to a third embodiment of the present invention will be described. FIG. 21 is a cross-sectional view of the positive displacement pump according to the third embodiment of the present invention as seen from the side. As shown in FIG. 21, in the positive displacement pump according to the present embodiment, the first fluid path 321 communicates with the first pump chamber suction port 317 at the lower end, and similarly, the second fluid path 461 is The lower end communicates with the second pump chamber suction port 457. Furthermore, the first pump chamber suction port 317 and the second pump chamber suction port 457 are both positioned below the rotation shaft 18. In other words, in the previous embodiment, the discharge flow rates of the first pump chamber 6 and the second pump chamber 7 were opposite to each other, but in this embodiment, the first pump chamber 6 and the second pump The discharge flow rate in the chamber 7 is in phase.

  As shown in FIG. 13, in the second embodiment, the second pump head 4 is configured to include a third frame 41 integrally formed. On the other hand, as shown in FIG. 21, in the present embodiment, the fourth frame 45 and the fifth frame 46 formed independently are provided for the convenience of processing. Furthermore, as shown in FIG. 13, in the second embodiment, the first frame 31 covers the entire back surface of the second frame 32, and the front cover 34 is attached to the front surface of the second frame 32. On the other hand, as shown in FIG. 21, in the present embodiment, the first frame 31 covers only the vicinity of the rotation axis on the back surface of the second frame 32, and the front surface of the second frame 32 is integrally formed. The positive displacement pump according to the present embodiment is configured in substantially the same manner as the positive displacement pump according to the second embodiment in other aspects.

  Next, with reference to FIG.22 and FIG.23, the eccentric drive member 2 which concerns on this embodiment is demonstrated. FIG. 22 is a front view of the state in which the eccentric drive member 2 is accommodated in the third pump head 5, and FIG. 23 is a rear view of the same. The eccentric drive member 2 according to the present embodiment includes a first disk member 24 and a second disk member 25 that are formed independently of each other, like the eccentric drive member 2 according to the second embodiment. Yes. The first disk member 24 and the second disk member 25 are formed in substantially the same manner as the first disk member 24 and the second disk member 25 according to the second embodiment. The difference is that the position of the open end is located directly below the insertion holes 240 and 250, respectively. Further, the first disk member 24 and the second disk member 25 according to the present embodiment are formed by cutting out a part of a substantially circular shape, and these cutouts are used as outer pump chamber discharge ports 247 and 257. . Since the other configuration has been described with reference to FIGS. 15 to 18, description thereof will be omitted.

  Next, the configuration of the first pump head 3 will be described with reference to FIG. FIG. 24 is a rear view of the first pump head 3. In the first pump head 3 according to the present embodiment, the first pump chamber suction port 317 is located immediately below the center of the first bearing cylinder housing port 311. Further, the first frame 31 covers only the vicinity of the rotation axis on the back surface of the second frame 32. The first pump head 3 is formed in substantially the same manner as the first pump head 3 according to the first embodiment in other points.

  That is, as shown in FIG. 24, the first pump head 3 includes a first frame 31 and a second frame 32 (see FIG. 21). The first frame 31 has a first bearing cylinder housing port 311 that penetrates the first frame 31 in the center and accommodates the bearing cylinder 241 (FIG. 22), and a first partition wall on the outside thereof. A first cylinder 312 that accommodates 242 (FIG. 22) and forms a C-shaped or arc-shaped first pump chamber 6 is formed. Further, on the outer periphery thereof, a facing surface 314 facing the pump chamber forming surface 244 (FIG. 22) is formed. A frame portion 313 between the first bearing cylinder housing port 311 and the first cylinder 312 has a first frame 31 via a pump chamber forming surface 318 and a connecting portion 316 that form the first pump chamber 6. Are coupled to the opposite surface 314. The position of the connecting portion 316 corresponds to the position of the open end of the first partition 242 of the eccentric drive member 2. The pump chamber forming surface 318 has a suction port 317 that penetrates the first frame 31 in the vicinity of the connecting portion 316 and communicates with the first fluid path 321 (FIG. 21) in the second frame 32. Is formed. The suction port 317 and the discharge ports 245 and 247 (FIG. 22) of the eccentric drive member 2 are disposed on the opposite sides with respect to the connecting portion 316.

  As shown in FIG. 21, a first fluid path 321 is formed in the second frame 32, and the first fluid path 321 and the suction port 317 communicate with each other. The upper end of the first fluid channel 321 is closed by a cap 33 so as to be opened and closed. As shown in FIG. 24, an outer peripheral flange 325 is formed on the outer peripheral side of the second frame 32, and a bolt through hole 329 is formed in the outer peripheral flange 325.

  Next, the configuration of the second pump head 4 will be described with reference to FIG. FIG. 25 is a rear view of the second pump head 4. In the second pump head 4 according to the present embodiment, the second pump chamber suction port 457 is located immediately below the center of the bearing cylinder housing port 451. The fourth frame 45 covers only the vicinity of the rotation axis on the front surface of the fifth frame 46. The second pump head 4 is formed in substantially the same manner as the second pump head 4 according to the first embodiment in other points.

  That is, as shown in FIG. 25, the second pump head 4 includes a fourth frame 45 and a fifth frame 46 (see FIG. 21). The fourth frame 45 has a bearing cylinder housing port 451 that penetrates the fourth frame 45 in the center and accommodates the bearing cylinder 251 (FIG. 23), and a second partition 252 (see FIG. 23) and a second cylinder 452 forming a C-shaped or arc-shaped second pump chamber 7 is formed. Further, on the outer periphery thereof, a facing surface 454 facing the pump chamber forming surface 254 (FIG. 23) is formed. A frame portion 453 between the bearing cylinder housing port 451 and the second cylinder 452 is an opposing surface of the fourth frame 45 via a pump chamber forming surface 458 and a connecting portion 456 that form the second pump chamber 7. 454. The position of the connecting portion 456 corresponds to the position of the open end of the second partition 252 of the eccentric drive member 2. The pump chamber forming surface 458 has a suction port 457 that communicates with the fourth frame 45 in the vicinity of the connecting portion 456 and communicates with the second fluid path 461 (FIG. 21) in the fifth frame 46. Is formed. The suction port 457 and the discharge ports 255 and 257 (FIG. 23) of the eccentric drive member 2 are disposed on the opposite sides with respect to the connecting portion 456.

  As shown in FIG. 21, a second fluid path 461 is formed in the fifth frame 46, and the second fluid path 461 and the suction port 457 communicate with each other. The upper end of the second fluid channel 461 is closed by a cap 42 so as to be opened and closed. As shown in FIG. 25, an outer peripheral flange 465 is formed on the outer peripheral side of the fifth frame 46, and a bolt through hole 469 is formed in the outer peripheral flange 465.

  As shown in FIG. 21, in the positive displacement pump according to the present embodiment, the position of the first pump chamber suction port 317 communicating with the first fluid path 321 and the second pump chamber suction port 457 of the second The position communicating with the fluid path 461 substantially coincides with the rotational direction of the rotating shaft 18. Therefore, for example, by installing the positive displacement pump so that the first pump chamber suction port 317 and the second pump chamber suction port 457 are positioned below the rotation shaft 18, the first and second fluid paths The transfer object can be sucked into the first and second pump chambers 6 and 7 from the lower ends of 321 and 461, and the transfer object can be suitably discharged from the first and second fluid paths 321 and 461.

  According to this embodiment, the position where the first pump chamber suction port 317 communicates with the first fluid path 321 and the position where the second pump chamber suction port 457 communicates with the second fluid path 461 are: Since they substantially coincide with each other in the rotation direction of the rotary shaft 18, there is an advantage that the sealing structure is easy as compared with the case where these are different by 180 °. Further, since the discharge ports 255 and 257 of the eccentric drive member 2 are at the same position, there are advantages that the residual liquid can be easily discharged and the inside of the pump chamber can be easily cleaned.

  DESCRIPTION OF SYMBOLS 1 ... Rotation driving force transmission part, 2 ... Eccentric drive member, 3 ... 1st pump head, 4 ... 2nd pump head, 5 ... 3rd pump head, 6 ... 1st pump chamber, 6a ... 1st Inner pump chamber, 6b ... first outer pump chamber, 7 ... second pump chamber, 7b ... first inner pump chamber, 7b ... second outer pump chamber, 11 ... rotating shaft, 18 ... rotating shaft, DESCRIPTION OF SYMBOLS 21 ... Connection part, 22 ... 1st disc member, 23 ... 2nd disc member, 24 ... 1st disc member, 25 ... 2nd disc member, 180 ... Drive side rotating shaft part, 181 ... Front end side rotation Shaft portion, 182 ... positioning portion, 191 ... cap member (attachment member), 192 ... positioning portion, 222 ... first partition, 225, 235 ... inner pump chamber discharge port, 226, 236 ... outer pump chamber discharge port, 232 ... second partition, 312 ... first cylinder, 3 2 ... first pump chamber inlet, 412 ... second cylinder, 417 ... second pump chamber inlet, 512 ... inlet, 514 ... discharge port.

Claims (9)

A rotation axis;
This is eccentrically mounted on the rotary shaft to move along a circular path around the rotational axis due to rotation of the rotary shaft to have a first disk member and the second disk member coaxially disposed An eccentric drive member;
Arranged on one side of the eccentric drive member in the rotational axis direction and opposed to the first disk member from one side in the rotational axis direction, together with the first disk member is an annular or arcuate first A first cylinder forming a pump chamber;
Arranged on the other side in the rotational axis direction of the eccentric drive member and opposed to the second disk member from the other side in the rotational axis direction, together with the second disk member is a second annular or arcuate shape . A second cylinder forming a pump chamber;
A pump head having a suction port for introducing fluid into the first pump chamber and the second pump chamber, and a discharge port for discharging fluid from the first and second pump chambers ,
The first disk member has a first partition that divides the first pump chamber into a first inner pump chamber and a first outer pump chamber on a surface facing the first cylinder; A first inner pump chamber discharge port communicating with the discharge port and the first inner pump chamber; and a first outer pump chamber discharge port communicating with the discharge port and the first outer pump chamber. ,
The second disk member has a second partition that divides the second pump chamber into a second inner pump chamber and a second outer pump chamber on a surface facing the second cylinder, A second inner pump chamber discharge port communicating with the discharge port and the second inner pump chamber; and a second outer pump chamber discharge port communicating with the discharge port and the second outer pump chamber. ,
The first cylinder has a first pump chamber suction port that communicates with the suction port, the first inner pump chamber, and the first outer pump chamber;
The positive displacement pump according to claim 2, wherein the second cylinder has a second pump chamber suction port communicating with the suction port, the second inner pump chamber, and the second outer pump chamber . Changes in the discharge flow rate from the first inner pump chamber and the first outer pump chamber due to movement of the eccentric drive member along the annular path are in reverse phase, and the second inner pump chamber and the second pump chamber displacement pump according to claim 1, wherein the change in the discharge flow rate from the second outer pumping chamber, characterized in that a reversed phase. Changes in the discharge flow rate from the first inner pump chamber and the second inner pump chamber due to movement of the eccentric drive member along the annular path are in reverse phase, and the first outer pump chamber and the The positive displacement pump according to claim 2 , wherein the change in the discharge flow rate from the second outer pump chamber is in reverse phase. Changes in the discharge flow rate from the first inner pump chamber and the second inner pump chamber due to movement of the eccentric drive member along the annular path are in phase, and the first outer pump chamber and the second outer pump chamber are in phase. The positive displacement pump according to claim 2 , wherein a change in discharge flow rate from the outer pump chamber of the second phase is in phase. The positive displacement pump according to any one of claims 1 to 4, wherein the first disk member and the second disk member are independently formed to be position-adjustable. The rotation axis is
A rotating shaft portion for transmitting the rotating operation;
The first disk member and the second disk member are attached to the distal end of the rotation shaft portion so that the position in the rotation axis direction can be adjusted, and at the base end side in the rotation axis direction of the second disk member. An eccentric shaft portion having a first positioning portion for defining a position;
Wherein the Ru and a mounting member having a second positioning portion for defining a position of the rotation axis of the eccentric shaft portion is rotated axial position adjustably coupled to the distal end of the first disk member The positive displacement pump according to claim 5 .   A rotation axis;
  Eccentric mounting having the first disk member and the second disk member that are coaxially arranged and move along an annular path centering on the rotation axis as the rotation axis rotates with the rotation axis. A drive member;
  Arranged on one side of the eccentric drive member in the rotational axis direction and opposed to the first disk member from one side in the rotational axis direction, together with the first disk member is an annular or arcuate first A first cylinder forming a pump chamber;
  Arranged on the other side in the rotational axis direction of the eccentric drive member and opposed to the second disk member from the other side in the rotational axis direction, together with the second disk member is a second annular or arcuate shape. A second cylinder forming a pump chamber;
  A pump head having a suction port for introducing fluid into the first pump chamber and the second pump chamber, and a discharge port for discharging fluid from the first and second pump chambers;
  With
  The first disk member and the second disk member are independently formed so that their positions can be adjusted,
  The rotation axis is
  A rotating shaft portion for transmitting the rotating operation;
  The first disk member and the second disk member are attached to the distal end of the rotation shaft portion so that the position in the rotation axis direction can be adjusted, and at the base end side in the rotation axis direction of the second disk member. An eccentric shaft portion having a first positioning portion for defining a position;
  A mounting member having a second positioning portion that is coupled to the tip of the eccentric shaft portion so that the position of the first disk member in the rotational axis direction is adjustable;
  With
  A positive displacement pump characterized by that. The positive displacement pump according to any one of claims 5 to 7, wherein the first disk member and the second disk member are independently rotatable within a predetermined angle range. The first cylinder includes a first fluid path that communicates the suction port and the first pump chamber suction port,
The second cylinder includes a second fluid path communicating the suction port and the second pump chamber suction port,
The position where the first pump chamber suction port communicates with the first fluid path and the position where the second pump chamber suction port communicates with the second fluid path are defined in the rotational direction of the rotary shaft. The positive displacement pump according to claim 4, which is substantially coincident.

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