JPH0647685U - Lubrication structure of gear pump for viscous fluid - Google Patents

Abstract

(57) [Summary] [Purpose] To smoothly discharge the deteriorated viscous fluid used for lubricating the shaft of the gear and improve the discharge accuracy. [Structure] Bearing members 33a, 33 for axially supporting shafts 29, 30, 31 to which gears 14, 15, 16 are fixed, respectively.
b; 34a, 34b; 35a. Formed on the inner peripheral surface of 35b is a spiral groove that swivels in a direction away from the gears 14, 15, 16 with respect to the rotation directions A1, A2, A3 of the shafts 29, 30, 31; The viscous fluid used for lubricating the shafts 29, 30, 31 is smoothly guided to the discharge holes 57, 63, 64 and discharged.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lubricating structure of a gear pump for viscous fluid, which is preferably implemented for quantitatively pumping a viscous fluid such as polyester, which is an undiluted solution such as a video tape.

[0002]

[Prior art]

 A viscous fluid such as polyester is supplied to the inlet side space where a plurality of gears meshing with each other separate from each other, and the fluid is stored in the tooth gaps of each gear. The film is transferred from the downstream side in the rotation direction to the outlet side space on the upstream side, the fluid is extruded from the tooth groove by the engagement of each tooth on the upstream side in the rotation direction, and the fluid is supplied to a die or the like to be extruded, whereby the film is It is formed.

Each of the gears is provided with a shaft projecting and extending to both sides in the axial direction thereof. The shaft is a bearing metal or the like fitted to a pair of side plates that sandwich the casing in which the gears are housed from both sides. Is rotatably supported by the bearing member. As shown in FIGS. 10 and 11, the viscous fluid to be pumped is guided between the outer peripheral surface of each shaft axially supported by such a bearing member and the bearing surface of the bearing member. The groove 1 is formed substantially parallel to the axis 3 of the gear 2, and the viscous fluid is passed through the remaining space 7 in the shaft hole 6 into which the shaft 5 is inserted and the discharge hole 8 communicating with the upper part of the space 7. It is discharged to the outside. The reason why the viscous fluid used for lubrication is discharged to the outside without returning to the inside in this way is that the fluid used for lubrication changes in quality, especially when various additives are added to the viscous fluid. Has a very small gap between the outer peripheral surface of the shaft 5 and the bearing surface 9 of about 0.1 to 0.2 mm, the additive remains and accumulates in such a minute gap, and the bearing surface is newly added. Is formed, the gap between the outer peripheral surface of the shaft 5 and the bearing surface is further reduced, and insufficient lubrication occurs, causing a so-called galling phenomenon in which the additive adheres to the bearing surface 9 in a scattered manner. I will end up. Further, in a place where the peripheral speed is small in the vicinity of the central axis 3 on the end surface 5a of the shaft 5, the viscous fluid deteriorates and remains, causing drain clogging in a narrow passage such as the discharge hole 8 and changing it for lubrication. There is a problem that the fluid cannot be smoothly discharged to the outside.

[0004]

[Problems to be solved by the device]

 SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a lubricating structure for a viscous fluid gear pump that can smoothly discharge a fluid used for lubrication.

[0005]

[Means for Solving the Problems]

 The present invention has a shaft that extends coaxially on both sides in the axial direction of a gear, and a bearing member that axially supports the shaft. The bearing surface of the bearing member has the gears in the axial direction of the shaft. A spiral recessed groove that extends in a direction away from the shaft is formed, and a communication hole that communicates in the axial direction from one end to the other end of the shaft is formed in the shaft. Means that both ends of the shaft of the bearing member are communicated with each other through the remaining space of each shaft hole into which at least one space is externally connected via a discharge hole formed in the upper portion of the bearing member. Is a lubricating structure for a viscous fluid toothed gear pump.

[0006]

[Action]

 According to the present invention, the shaft of the gear is formed with a spiral groove that swirls in a direction away from the gear with respect to the rotation direction of the shaft, and the viscous fluid in the groove is rotated by the rotation of the shaft. The fluid introduced to both axial end portions of the fluid and flowing into one of the spaces formed near these axial end portions is introduced from one end side to the other end side through the communication hole formed in the shaft. It flows into the remaining space and is discharged to the outside through the discharge hole. In this way, by virtue of the rotation of the shaft, so-called viscous fluid is forcibly transferred, so that lubrication can be smoothly achieved and the deteriorated fluid after discharge is reliably discharged. It becomes possible.

[0007]

FIG. 1 is a horizontal sectional view showing a gear pump 13 according to an embodiment of the present invention, FIG. 2 is a left side view of the gear pump 13, and FIG. 3 is a right side view of the gear pump 13. is there. The gear pump 13 of this embodiment is a viscous fluid such as a stock solution of video film or other synthetic resin such as polypropylene, polyethylene, polycarbonate, polystyrene, nylon, ABS resin, methacrylic resin, polyurethane, and the like. A gear pump for transferring PEEK and the like, which is installed in a later step of the extruder 36 and is used to supply the viscous fluid to the die 41 at a stable flow rate.

Such a gear pump 13 has a casing 17 in which three gears 14, 15, 16 are housed, two side plates 18, 19 for sandwiching the casing 17 from both sides, and these casings 17 And a plurality (12 in this embodiment) of fixing bolts 20 for fixing the side plates 18 and 19 to each other, and a plurality (2 in this embodiment) for positioning the casing 17 and the side plates 18 and 19 relative to each other. A hollow dowel 21, a seal housing 24 fixed to the one side plate 19 by a plurality of (four in this embodiment) mounting bolts 23, an annular gland packing 25 mounted in the seal housing 24, and a tightening member. A pressing member 27 that is attached to the seal housing 24 by a bolt 26 and comes into lateral contact with the gland packing 25; Shafts 29, 30, 31 fixed to 15, 16 and bearing members 33a, 33b; 34a, 34b; 35a for axially supporting the shafts 29, 30, 31 on both sides with respect to the gears 14, 15, 16, respectively. 35b.

The side plate 18 has two inlets 37 and 38 to which the viscous fluid extruded from the extruder 36 is supplied, and an outlet 39 from which the viscous fluid extruded by the gears 14, 15 and 16 is discharged. , 40, and the viscous fluid extruded from the outlets 39, 40 is guided to the die 41, and formed into, for example, a film for video and wound.

The inlets 37, 38 are provided on the upstream side in the rotation directions A1, A2, A3 of the meshing portions M1, M2 of the gears 14, 15, 16 and the outlets 39, 40 are rotated in the rotation direction more than the meshing portions. It is provided on the downstream side of A1, A2 and A3. Therefore, when the gears 14, 15, 16 are disengaged from each other by the rotation of the gears 14, 15, 16, the viscous fluid supplied from the inlets 37, 38 is sucked into the tooth gaps and accumulated in the tooth gaps. The viscous fluid is formed by the inner surfaces 43, 44 of the side plates 18, 19 facing each other with the casing 17 in between and the inner peripheral surface of the pump chamber 45 into which the gears 14, 15, 16 are fitted. 46, the gears 14, 15 and 16 are transferred in the directions of arrows B1 and B2 as they rotate, and the teeth of the gears 14, 15 and 16 mesh with each other near the outlets 39 and 40. By virtue of the combination, the viscous fluid in the tooth space is pushed out, and is discharged from the outlets 39 and 40 and guided to the die 41 as described above.

In this way, the three transfer gears B1, B2 are constituted by the three gears 14, 15, 16 and the fluids extruded from these tooth spaces are discharged through the two outlets 39, 40 and then merged. Since the dies 41 are supplied to the die 41, the pulsations of the fluids can be canceled at the time of the merging, and a stable discharge pressure can be obtained.

The gears 14, 15, 16, casing 17, side plates 18, 19 and seal housing 24 are made of alloy tool steel and are heated to the same temperature as the viscous fluid by a heating means (not shown). Such a temperature is, for example, 150 to 280 ° C. Further, the shaft 29 to which the gear 14 is fixed is a drive shaft, and when power from a motor (not shown) is transmitted through a speed reducer, for example, when the viscosity of the viscous fluid to be pumped is 10,000 poises, The rotation speed is 15 to 20 rpm. The discharge pressure at this time is about 10 to 20 MPa (= 100 to 200 kgf / cm ² ).

FIG. 4 is an enlarged sectional view showing the bearing member 33a. The bearing member 33a has a cylindrical portion 47 having a substantially right cylindrical shape, and an end plate 48 that closes one axial end portion of the cylindrical portion 47. A shaft hole 49 into which the shaft 29 is inserted is formed in the cylindrical portion 47, and the inner peripheral surface of the right circular cylinder forms a bearing surface 50. The cylindrical portion 47 is formed with a spiral recessed groove 51 that extends by turning in a direction away from the gear 14 (leftward in FIG. 4) with respect to the rotation direction A 1 of the shaft 29. As shown in FIG. 5, the end of the concave groove 51 on the upstream side in the flow direction C is opened to face the fluid introducing groove ends X1, X2, X3 provided on the inner surface 43 of the side plate 18, and The end of the concave groove 51 on the downstream side in the flow direction C is opened to face the remaining space 56 formed between the end plate 48 and the step surface 55 facing the end surface 54 facing the shaft hole 49. . Therefore, when the shaft 29 is rotationally driven in the direction of arrow A1, the viscous fluid in the concave groove 51 defined by the outer peripheral surface of the shaft 29 is forcibly transferred in the direction of arrow C, which is the transferred viscous fluid. Lubrication can be achieved. The viscous fluid thus guided to the remaining space 56 is discharged from the discharge hole 57 formed in the upper part of the end plate 48, that is, on the front side perpendicular to the paper surface of FIG. 4, and passes through a conduit (not shown). Recovered and processed. The end plate 48 also has a retreat groove 58 extending in the diametrical direction and communicating with the discharge hole 57. Even if the end face 59 approaches the inner surface 54 due to the axial displacement of the shaft 29, the viscous It is configured so that a fluid discharge channel can be secured.

The remaining bearing members 34 a, 34 b; 35 a, 35 b (excluding the bearing member 33 b described later) also have a similar configuration and separate from the gears 15, 16 in the respective rotation directions A 2, A 3. Grooves 60a, 60b; 61a, 61b that turn in the direction, that is, leftward and rightward in FIG. 1 and discharge holes 63, 64 are formed.

FIG. 6 is an enlarged sectional view showing the bearing member 33b. The bearing member 33b has a substantially right cylindrical shape, and a groove 51b is formed in a shaft hole 65 through which the shaft 29 is inserted. The recessed groove 51b is formed in a spiral shape extending in a direction away from the gear 14 with respect to the rotation direction A1 of the shaft 29, that is, in the rightward direction in FIG. Therefore, when the shaft 29 is rotationally driven in the arrow A1 direction, the viscous fluid in the concave groove 51b is transferred in the arrow D direction.

As shown in FIG. 7, an end portion of the concave groove 51b on the upstream side in the arrow D direction is opened to face the fluid introducing groove ends Y1, Y2, Y3 provided on the inner surface 44 of the side plate 19. An end portion of the concave groove 51b on the downstream side in the arrow D direction is an inner peripheral surface 69 which forms a free insertion hole 68 having a diameter larger than that of the shaft hole 65 by a step surface 67 perpendicular to the axis of the bearing member 33b. An opening is formed so as to face an annular residual space 70 formed between the loose insertion hole 68 and the outer peripheral surface of the shaft 29.

A straight first guide passage 71, which extends along the central axis of the shaft 29 and opens at the end face 59 to face the remaining space 65, and communicates with the first guide passage 71. A second guide passage 73 is formed that extends in the radial direction and opens on the outer peripheral surface of the shaft 29 to face the remaining space 70.

The operation will be described with reference to FIG. When the shaft 29 is rotationally driven in the direction of the arrow A1, the remaining gears 15, 16 meshing with the gear 14 are rotationally driven by the arrows A2, A3, respectively, and these gears 14, 15, 16 are driven. With the rotation operation, the viscous fluid extruded from the extruder 36 is supplied from the inlets 37 and 38 to the meshing portions M1 and M2 between the gears 14, 15 and 16 that mesh with each other, and the viscous fluid is directed in the directions of the arrows B1 and B2. It is transferred and discharged from the outlets 39 and 40.

As the gears 14, 15, 16 rotate in this manner, one of them flows into the gap between the side surfaces of the gears 14, 15, 16 and the inner surfaces 43, 44 of the side plates 18, 19. The viscous fluid in the section is transferred in the directions of arrows C, C1, C2; D 1, D 1, D 2 by the rotation of the shafts 29, 30, 31 and is extruded into the remaining spaces 56, 70. On the shaft 29, the viscous fluid guided to the one remaining space 70 is guided to the other remaining space 56 via the first and second guide passages 71 and 73, as described above, and is guided to the concave groove 51. It is merged with the viscous fluid flowing in from the discharge port 57 and discharged. The viscous fluid introduced into the residual spaces 80 and 81 by the rotation of the residual shafts 30 and 31 passes through the third and fourth guide passages 74 and 75 extending along the axial direction of the respective shafts 30 and 31. It is introduced into the remaining spaces 56, 84, 85 through each of them, merges with the viscous fluid extruded from the recessed grooves 60a, 61a as described above, and is discharged from the discharge holes 63, 64, respectively. . Even if these shafts 29, 30, 31 are displaced to one side in the axial direction and come close to the end face 54 of each end plate 48 of each bearing member 33a, 34a, 35a as shown in FIG. The viscous fluid in 56 can pass through the retreat groove 58 and be guided into the discharge holes 57, 63, 64, and there is no possibility that the flow of the viscous fluid will be hindered. Can be discharged.

A part of the viscous fluid used to lubricate the shafts 29, 30, 31 in this way merges with one pipe line 76 and is collected in the container 77 and processed. In this way, a part of the viscous fluid used for lubrication is extruded from the outlets 39, 40 and processed without being mixed with the viscous fluid, so there is no fear that the viscous fluid modified by lubrication is supplied to the die 41. This makes it possible to manufacture products such as high definition video films.

[0021]

[Effect of device]

 As described above, according to the present invention, since the spiral groove is formed on the bearing surface of the bearing member and the viscous fluid used for lubricating the shaft can be smoothly discharged, the viscosity changed by the lubrication can be improved. The fluid can be smoothly discharged, and the viscous fluid can be discharged at a stable flow rate without causing a change in the properties of the viscous fluid, whereby a stable and high discharge accuracy can be achieved.

[Brief description of drawings]

FIG. 1 is a horizontal sectional view showing a gear pump 13 according to an embodiment of the present invention.

2 is a left side view of the gear pump 13. FIG.

3 is a right side view of the gear pump 13. FIG.

FIG. 4 is an enlarged sectional view showing a bearing member 33.

FIG. 5 is a side view of the side plate 18 as viewed from the inner surface 43 side.

FIG. 6 is an enlarged sectional view showing a bearing member 33b.

FIG. 7 is a side view of the side plate 19 as viewed from the inner surface 44 side.

FIG. 8 is a simplified perspective view for explaining the operation of the gear pump 13.

FIG. 9 is an enlarged cross-sectional view near a residual space 56.

FIG. 10 is a typical prior art cross-sectional view.

11 is a cross-sectional view taken along the section line XI-XI in FIG.

[Explanation of symbols]

13 gear pumps 14, 15, 16 gears 17 casings 18, 19 side plates 29, 30, 31 shafts 33a, 33b; 34a, 34b; 35a, 35b bearing members 36 extruders 37, 38 inlets 39, 40 outlets 41 dies 49 shaft holes 50 bearing surface 51, 51b, 60a, 60b, 61a, 61b concave groove 56, 70 residual space 71, 73, 74, 75 guide passage

Claims (1)

[Scope of utility model registration request] 1. A gear having a shaft that extends coaxially on both sides in the axial direction of the gear and a bearing member that supports the shaft, and the bearing surface of the bearing member has the gear in the axial direction of the shaft. A spiral recessed groove that extends in a direction that moves away from is formed, and a communication hole that communicates in the axial direction from one end to the other end of the shaft is formed in the shaft, and the communication hole and the recessed groove. Is communicated through the remaining space of each shaft hole into which both ends of the shaft of the bearing member are inserted,
A lubricating structure for a viscous fluid gear pump, wherein at least one space communicates with the outside through a discharge hole formed in the upper portion of the bearing member.