JPS6242144Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The invention includes a spline gear provided on one drive shaft, a free gear that meshes with the spline gear, and a pin that pivotally supports the free gear. Regarding food gear pumps.

[Prior art]

Gear pumps, which forcefully pump fluid by meshing a pair of gears, are often used in the food industry because they can achieve high pressure. For this purpose, the applicant has already proposed a gear pump for food, which is disclosed in, for example, Japanese Utility Model Application Publication No. 56-57978.

Generally, gear pumps for food use must be disassembled and cleaned after each day's work to prevent fluid from remaining and causing spoilage. To this end, in the prior art, the part where the drive shaft passes through the gear housing can be easily cleaned, but later, when it was put to practical use, it was found that there was a problem in removing the cover.

In other words, in a gear pump, in order to maintain efficiency, the side of the gear, that is, the end of the drive shaft or pivot pin, must be sufficiently sealed, but a good seal requires troublesome work when attaching and detaching. In particular, since the drive shaft receives thrust in the axial direction due to the mechanical seal, it is troublesome to assemble it against the thrust force.

On the other hand, since the free gear has a small thrust force, it is possible to seal one side with a cover and the other side with a gear housing.

When disassembling a gear pump, the cover is removed and the free gears attached to the drive shaft and spline gears and pins are removed and cleaned, but usually multiple bolts must be removed to remove the cover. It's extremely troublesome.

[Purpose of invention]

Therefore, an object of the present invention is to provide a food gear pump in which the end face of the drive shaft on the cover side can be easily sealed and the cover can be removed very easily.

[Structure of the idea]

According to the present invention, in a food gear pump that includes a spline gear provided on one drive shaft, a free gear that meshes with the spline gear, and a pin that pivotally supports the free gear, the bearing of the drive shaft is The gear housing includes a shaft bearing housing housed therein, a gear housing coupled to a flange of the shaft bearing housing, and a cover of the gear housing provided on the opposite side of the flange surface with respect to the gear housing. The spline gear and the free gear are housed in mesh with each other, and a pin that pivotally supports the free gear extends through the cover, the gear housing, and the flange, and the end on the flange side is fitted with a nut. fixed by
The end on the cover side is removably fixed with an eye nut, and a pad made of an elastic material is provided between the end of the drive shaft and the cover.

[Function and effect of the idea]

Therefore, by removing the eye nuts during disassembly, the cover can be easily removed.
Further, due to deflection of the cover, slight errors at the end of the drive shaft away from the pin that pivotally supports the free gear can be absorbed by the elastic pad, and at the same time, thrust force can also be absorbed by the pad. Therefore, the pump efficiency is good. It can be easily assembled by simply pressing the cover.

During normal operation, it can operate in the same way as conventional products. Since the pin that pivotally supports the free gear has the function of fixing the cover in this way, it is extremely easy to remove the cover.

〔Example〕

Hereinafter, one embodiment of the present invention will be explained in more detail with reference to the drawings.

Now, in FIGS. 1 and 2, a gear pump P for food according to the present invention has a shaft bearing housing 3 in which one drive shaft 1 is rotatably housed by bearings 2, and a spline. It is composed of a gear housing 30 in which a gear 20 and a free gear 21 are housed, and these two housings 3, 30 are combined to complete the entire gear pump.

The shaft bearing housing 3 has a flange 4 in a portion facing the gear housing 30,
The collar 36 is connected to the bottom wall 31 of the gear housing 30 via this flange with bolts, and the gear housing 30 and the shaft bearing 3 are aligned with each other by a collar 36 having an L-shaped cross section. Therefore, the collar 36 comes into contact with the stepped part 5 formed on the inner peripheral part of the flange 4, and the circumferential part contacts the inner peripheral surface 34 of the connecting hole formed in the bottom wall 31 of the gear housing. They are connected through a part of it.

A mechanical seal M is attached to a portion of the drive shaft 1 on the gear housing 30 side, and the structure of this mechanical seal is approximately the same as the above-mentioned known technique proposed by the applicant. In other words, the mechanical seal M includes a metallic rotating ring 6 that is slidably fitted onto the drive shaft 1, a sealing material 7 that is detachably attached to the rotating ring, and a fixed ring to which the sealing material is connected. It consists of 8. The rotary ring 6 has a concave groove in which an O-ring 9 is inserted, and has a hook engaging part 6a at the end for pulling out when replacing the ring. At least the main body portion of the sealing material 7 attached to the rotating ring 6 is preferably made of an elastic material, such as rubber or plastic, and the portion in contact with the fixed ring 8 is preferably made of hard carbon resin.

The drive shaft 1 has a reduced diameter at the part where the mechanical seal M is attached, but the gear housing 3
The diameter of the portion 10 extending inward is further reduced, and an axial spline 11 is formed on the outer peripheral surface of this portion. A spline gear 20 is supported on this cantilever-like extending portion 10.

A spring 12 is interposed between the boss portion 22 of the spline gear 20 and the rotating ring 6.
This spring presses the sealing material 7 toward the fixed ring 8 to perform a sealing action, but in order to receive the reaction force, the cover 33 of the gear housing 30 and the spline gear 20 (therefore, the end of the drive shaft 2) Between them is a pad 1 made of an elastic material such as synthetic resin.
3 is provided.

Free gear 21 meshing with spline gear 20
is rotatably supported by a pin 22 via a collar 23. A screw 25 is formed at the end 24 of this pin, into which an eye nut 26 is screwed. Therefore, by removing the eye nut 26, the cover 33 that closes the open end of the gear housing 30 can be removed.
A thread is also formed at the other end of the pin 22, and the base 2
6, the gear housing 30 can be fixed by a nut 27. In addition, the reference numeral 29 in the figure is a bolt for fixing the bottom wall 31 of the gear housing to the base 26, and 28 is an O-ring.

Since the gear pump for food according to the present invention is constructed as described above, when the drive shaft 1 is rotationally driven by an appropriate power source such as a motor, the pair of gears 20 and 21 in the gear housing 30 rotates, and liquid is sucked in through a suction port formed in a part of the circumference of the gear housing 30 and discharged through a discharge port (both not shown).
During disassembly work, the cover 33 can be attached with eye nuts 26, so simply loosen and remove the eye nuts 26, and the cover 33 can be attached.
3 can be removed. Therefore, both the spline gear 20 and the free gear 21 can be pulled out, and the mechanical seal M can be maintained and inspected from the gear housing. That is, when the collar 36 is removed, the rotary ring 6 can be pulled out toward the gear housing by pulling the hook engaging portion 6a. Appropriate maintenance such as replacing the sealing material 7 made of an elastic material can then be carried out. Furthermore, although two gears are used, since the drive shaft 1 is used, it is lightweight and compact, and since only one mechanical seal is required, it can be manufactured at low cost. Furthermore, it has the advantage that there is only one mechanical seal part that is troublesome to maintain and inspect.

[Advantages of the present invention]

As explained above, according to the present invention, not only the gear but also the mechanical seal can be inspected by simply removing the cover of the gear housing while leaving the pump piping system as it is, making it easy to disassemble and clean. will be widespread.

For example, in the food processing field, it is used for: ・ Focusing on small quantity quantitative measurement of juices, puddings, etc., where pulsation is avoided; ・ Used for transporting small particle slurry related to the production of tofu, miso, anchovies, etc.; ・ Small particles during production. It can be used for transporting slurry, etc.

It is clear that the present invention is not limited to the illustrated example. For example, a geared motor can be directly connected to the drive shaft to use the motor housing instead of the shaft bearing housing.
Therefore, in the present invention, when the shaft bearing housing is referred to, it is clear that this type of housing, such as the above-mentioned motor housing, is also included.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing one embodiment of a gear pump embodying the present invention, and FIG. 2 is a horizontal half sectional view thereof. DESCRIPTION OF SYMBOLS 1... Drive shaft, 3... Shaft bearing housing, 10... Portion of drive shaft extending into gear housing, 11... Spline, 13... Cover, 20... Spline gear, 21... Free gear, 22 ...Pin, 26...Ainatsu, 30...
...Gear housing, M...Mechanical seal.

Claims (1)

[Scope of utility model registration request] A spline gear provided on one drive shaft,
A food gear pump that includes a free gear that meshes with the spline gear and a pin that pivotally supports the free gear; The gear housing includes a gear housing and a gear housing cover provided on the opposite side of the flange surface with respect to the gear housing, and the spline gear and the free gear are housed in mesh with each other in the gear housing. The pivotally supported pin extends through the cover, the gear housing, and the flange, an end on the flange side is fixed with a nut, and an end on the cover side is removably fixed with an eye nut. What is claimed is: 1. A gear pump for food products, characterized in that a pad made of an elastic material is provided between the end of the drive shaft and the cover.