JPH0433433Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a gear pump, for example, a gear pump that constitutes a synthetic resin melt extrusion device, and in particular, the feed material wears and damages the tooth surfaces of the gears of the gear pump. This relates to gear pumps that handle things that cause

[Conventional technology]

Conventional gear pumps of this type include, for example:
Some are installed at the tip of a kneading extruder for synthetic resins.

For such gear pumps, in most cases, no special consideration is given to the driving method, and a general method is adopted.

That is, the gear shaft of one gear is driven by a power source, and the other gear is driven by meshing with the one gear.

In some cases, the gear shafts of the gears that are meshed are extended outside the machine, and gears are attached to these shafts and meshed with each other, so that each of the gears inside the machine is driven externally. .

[Problem that the invention attempts to solve]

In the method of driving a single shaft configured as described above, the tooth surfaces of the gears are in sliding contact with each other, and therefore, high viscosity resin, calcium carbonate, silicon oxide, etc. When feeding a fluid containing fine particles of inorganic substances such as aluminum oxide, the sliding friction becomes even more extreme, causing severe wear and tear on the tooth surfaces, and as a result, long-term continuous operation becomes impossible. The problem is that it is impossible.

Furthermore, even if gears are provided on the gear shafts that extend outside the machine and are meshed together, the driving force to the gears inside the machine is simply distributed to each gear shaft, and the drive force between the gears inside the machine is Sliding friction, particularly when the fine particles of the inorganic substance are included in the fluid to be fed, is similar to the case of the single-shaft drive described above, and has the same problems.

Furthermore, when using molten resin as the feeding fluid,
Since it is operated at high temperatures of over 200℃, the meshing conditions of the gears outside the machine change due to deformation due to thermal expansion, which is extremely difficult to adjust, and there is a possibility that normal operation cannot be continued. It also has the problem that it is very large.

This invention was made in order to solve the above-mentioned problems, and the object is to obtain a gear pump device configured so that the tooth surfaces of the gears are kept in a non-contact state with each other when the gear pump is in operation.

[Means for solving problems]

A gear pump having a first pump gear and a second pump gear that rotate in opposite directions to each other via a bearing is driven by a gear device that has a first gear and a second gear that mesh with each other and rotate in opposite directions via a bearing. In the gear pump device, a pair of first shaft joints and a pair of second shaft joints, which are flexible joints in the axial direction and in the direction perpendicular to the axis, for connecting each of the pump gears and each of the gears; 1. A pair of flange-type shaft joints are provided between the second shaft joints, and the tooth surfaces of each of the pump gears are maintained in a non-contact state via the flange-type shaft joints.

[Effect]

Since this device is constructed as described above, when power is supplied to one gear shaft of the gear device, the other gear shaft also rotates due to the meshing of the gears, and in this state, the teeth of the gear pump gear The surfaces are not in contact with each other via both gear shafts of the gear device and the shaft joints attached to the two gear shafts and are out of phase, so that they only come into contact with the fluid being fed. send.

[Example] Hereinafter, this invention will be explained based on drawings showing an example of the invention.

The gear pump 1 includes a first pump gear 2, a second pump gear 3 meshing with the first pump gear 2, gear shafts 2a and 2b of the first and second pump gears 2 and 3,
It is composed of a bearing 4 that supports the gear shafts 2a and 3b, a barrel 5 that supports and fixes the bearing 4, and side plates 6 that close both sides of the barrel 5.
The gear shafts 2b, 3b on the same side of b, 3a, 3b extend to the outside of the side plate 6.

The gear device 11 includes a first gear 12 and a first
A second gear 13 meshing with the gear 12 is disposed within the casing 14, and the side plate 1 closes both sides of the casing 14.
5, the first gear shafts 12a, 12b and the second gear shafts 13a,
The gear shafts 12a and 13a on the same side are rotatably held and housed by the side plate 15.
The gear shaft 1 extends outward, and furthermore, the above-mentioned extending gear shaft 1
2a, 13a, the gear shaft on the opposite side, for example, the first
The gear shaft 12b is the extended gear shaft 12a.
It extends in the opposite direction and is connected to the drive source. Note that the first gear shaft 12a and the second gear shaft 13a of the gear device 11 rotate in opposite directions to each other, similar to the relationship between the first gear shaft 2b and the second gear shaft 3b of the gear pump 1. The ratio is also the first of the gear pump.
The rotation ratio of the gear shaft 2b and the second gear shaft 3b is the same, and the distance between the shafts is the same or approximately the same as the distance between the first gear shaft 2b and the second gear shaft 3b of the gear pump.

Next, reference numeral 21 denotes a shaft coupling device, the first shaft coupling 22 of which is a flexible coupling in the axial direction and in the direction perpendicular to the axis, such as a gear coupling, one end of which is attached to each gear shaft 2b, 3b of the gear pump 1. It is connected to one end of the shaft, and a flange-shaped shaft joint 22a is provided at the other end. Further, the second shaft joint 23 is also a flexible joint similar to the above, such as a gear coupling, and one end thereof is connected to the shaft end of each gear shaft 12a, 13a of the gear device 11, and the other end is connected to the shaft end of each gear shaft 12a, 13a of the gear device 11. Similarly, the shaft joint 22a
A flange-type shaft joint 23a that can be connected to is provided.

The flange-type shaft joints 22a and 23a are connected by rotating the drive shaft of the gear device 11 in a predetermined direction, and with all the gears in the gear device 11 in contact with the drive side without any play, the gear pump is connected. A flange-type shaft joint 22a is provided to provide a desired clearance between the meshing teeth of the first and second pump gears 2 and 3 in the flange-type shaft joint 22a so as to prevent tooth surface contact when the gear pump is rotated by the gear device 11. , 23a are connected and fixed.

In the embodiment of the invention configured in this way, when the first gear shaft 12b of the gear device 11 is rotationally driven by the drive source, the first pump gear 2 and the second pump gear 3 of the gear pump 1 are independently rotated. and are rotated without the tooth surfaces contacting each other. That is, the first pump gear 2 of the gear pump 1
are the first gear shafts 12b, 12a of the gear device 11,
The second shaft joint 23 of the shaft joint device 21, 23a, 2
2a, 22, and the first gear shaft 2b of the gear pump 1, and the second pump gear 3 of the gear pump 1 is driven via the first gear shaft 12b, the first gear 12, and the second gear shaft 2b of the gear device 11. Gear 13, second gear shaft 13a, shaft joint 23 of shaft joint device 21, same 23
a, 22a, 22, and the second gear shaft 3b of the gear pump 1, and therefore, each is driven independently. Since the gears of the gear device 11 are in close contact with each other in the driving state, the gears 2 and 3 of the gear pump 1 rotate in a state where the tooth surfaces are not in contact with each other.

Furthermore, since the gear pump 1 handles high-temperature molten resin of 200°C or higher, it undergoes thermal deformation, but since the gear pump 1 is provided with shaft joints 22 and 23 that are flexible in the axial direction and in the direction perpendicular to the axis, the gear device 11 is The gear pump is not affected and operates normally, so that the gear pump tooth surfaces can be kept in a non-contact state at all times.

In the above embodiment, the drive source is the gear device 11.
Although the connection is not limited to this, the connection is not limited to the second gear shaft 13b of the gear device 11, or to any gear shaft on the side where the first shaft joint 22 of the gear pump 1 is not provided. In either case, the effect is exactly the same as the effect of the above embodiment.

[Effect of idea]

As described above, according to this invention, when the gear device is driven and the tooth surfaces of each gear are in contact and there is no play, the tooth surfaces of each gear of the gear pump are in a state of non-contact with each other. As a result, there is no sliding wear between the tooth surfaces of each gear of the gear pump, and therefore, the wear on the tooth surfaces is significantly reduced, and there is almost no thermal influence from the high temperature resin, so it can be used for a long time. This has the effect of providing a gear pump device that can operate continuously and stably for hours, and because the tooth surfaces are non-contact, the generation of vibration and noise is significantly reduced, and that it is possible to operate at high speed. ing.

[Brief explanation of the drawing]

The figure is a longitudinal sectional view of an embodiment of the gear pump device according to this invention. 1... Gear pump, 2... First pump gear, 2
a, 2b...first gear shaft, 3...second pump gear, 3a, 3b...second gear shaft, 11...gear device, 12...first gear, 12a, 12b...first
Gear shaft, 13...Second gear, 13a, 13b...
Second gear shaft, 21... shaft coupling device, 22... first
Shaft joint, 23...Second shaft joint, 22a, 23a...
...Flanged shaft joint.

Claims (1)

[Claims for Utility Model Registration] A gear pump 1 having a first pump gear 2 and a second pump gear 3 which rotate in opposite directions to each other via a bearing 4.
is driven by a gear device 11 having a first gear 12 and a second gear 13 via a bearing 16 that mesh with each other and rotate in reverse, each of the pump gears 2 and 3 and each of the gears 12 ,
13, a pair of first shaft joints 22 and a pair of second shaft joints 23, which are flexible joints in the axial direction and the direction perpendicular to the axis, and each of the first and second shaft joints 2.
2, 23, and a pair of flange-type shaft joints 22a, 23a provided between each of the pump gears 2, 23.
Between the tooth surfaces of No. 3 are the flange type shaft joints 22a and 23.
A gear pump device characterized in that it is maintained in a non-contact state via a.