JPS6146412Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a turbine meter, and by providing a labyrinth-shaped shaft seal on the facing thrust surface of the impeller and the housing that supports it, the lubricating oil for the bearing in the housing can be easily removed. The purpose is to provide a turbine meter that prevents leakage.

In general, a full-bore turbine meter has a configuration in which the rotating shaft of an impeller is supported by a housing, and the outer blade portion of the impeller faces a flow path with an annular cross section to measure the flow rate of fluid passing through the flow path. However, the rotating shaft is supported through a pair of bearings in the housing, and various methods have been considered for lubricating the bearings.

Conventional turbine meters, for example, have used sealed bearings with grease sealed inside, and while this is easy to assemble and maintain, grease inherently has a relatively high viscosity. Therefore, when the fluid flow rate is small and the rotational speed of the impeller is small, the high viscosity causes uneven rotation, resulting in poor measurement accuracy.

Another conventional example is to store oil below the bearing level in a housing that supports the rotating shaft, and use a splash plate installed on the rotating shaft to splash the oil and lubricate the bearing. According to the above, although the drawbacks mentioned above at low flow rates are solved, the oil flows out of the housing through the bearing and adheres to the blades of the impeller, causing dirt to adhere to the blades, resulting in a decrease in measurement accuracy, etc. There were some shortcomings.

Furthermore, as another conventional example, for example, a convex part and a concave part extending over 360 degrees are provided on the outer periphery of the rotating shaft and the inner periphery of a hole in the housing through which the rotary shaft is inserted, respectively, to form so-called lavins that mesh with each other, and these lavins prevent the oil from flowing out. Although it is conceivable to prevent this from occurring, this method requires the housing to be divided into upper and lower halves on a horizontal plane due to assembly problems, and has the disadvantage that it is very troublesome in manufacturing and assembling.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings.

1 and 2 are a longitudinal sectional view of one embodiment of a turbine meter according to the present invention and an enlarged longitudinal sectional view of its essential parts, respectively. In the figure, a turbine meter 1 has a cylindrical body 2, and the cylindrical body 2 has an upper flange 2.
a, flanges 2b at both ends, and a flow path 2c, and upstream and downstream cone members 3 and 4 are fitted and fixed to the inner periphery. Flange 2 above downstream cone member 4
A housing 6 having a count display section 5 is attached and fixed to a.

Reference numeral 7 denotes a roughly cylindrical housing, which is loosely fitted and fixed to the inner periphery of the downstream cone member 4, with a bearing 9 fitted and fixed to one end through a lid 8, and a bearing 10 fitted and fixed to the other end. ing. The housing 7 has an oil reservoir chamber 7a therein for storing lubricating oil 11, which will be described later, and a pair of swash plates 12 and 13 are fixedly attached to the left and right sides of the oil reservoir chamber 7a. Also, the housing 7 and the downstream cone member 4
A sealed chamber 14 is formed between the inner wall and the inner wall.

Reference numeral 15 denotes a lubricating oil supply line, which is communicated from an opening at one end to the oil reservoir chamber 7a via the downstream cone member 4 and the housing 7, and supplies the lubricating oil 1 in the oil reservoir chamber 7a.
Used when exchanging 1. The lower end of the hole 4a below the chamber 14 of the downstream cone member 4 is communicated with a screw hole 2d of the cylindrical body 2, and a drain plug 16 is provided in the screw hole 2d. When replacing the lubricating oil 11, the lubricating oil 11 is discharged from the oil reservoir chamber 7a to the outside through the chamber 14 and the screw hole 2d.

Reference numeral 21 denotes an impeller 21, which has several to several tens of blades 23 planted around the outer periphery of a disc-shaped hub 22, and has a rotating shaft 24 fixed concentrically thereto. As shown in FIG. 1, the impeller 21 and the rotary shaft 24 are rotatably supported by the rotary shaft 24 being inserted into bearings 9 and 10 with the blades 23 positioned on the outer periphery of the cone members 3 and 4 of the flow path 2c. . A pair of splash plates 25 are also fixed to the rotation 24.

Reference numeral 26 denotes a rising axis, and the direction of the rotation of the rotating shaft 24 is changed by a predetermined conversion mechanism and transmitted to the count display section 5.

The turbine meter 1 configured as described above is inserted into a pipe through which a predetermined fluid flows through flanges 2b at both ends thereof. Then, the fluid flowing in from the left side of the flow path 2c in FIG.
The flow path passes through the ring-shaped cross-sectional flow path between the four sections, that is, the blades 23, and proceeds to the right in the figure. Then, since the impeller 21 and the rotary shaft 24 rotate at a rotation speed proportional to the flow rate, the rising shaft 26 rotates in conjunction with the rotation, and this rotation is transmitted to the totalizer of the count display section 5 through a magnetic coupling or the like. In this way, the flow rate, flow rate, etc. are displayed by the count display section 5.

Furthermore, while the turbine meter 1 is in operation, since the lubricating oil 11 is stored at a predetermined level in the oil reservoir chamber 7a, the lubricating oil 11 is easily splashed up by the rotation of the splash plate 25 of the rotating shaft 24. After being attached to the swash plates 12 and 13, it is supplied to the bearings 9 and 10 through the swash plates 12 and 13 for lubrication. Thereafter, the lubricating oil 11 returns to the lower part of the oil reservoir chamber 7a.

However, as mentioned above, the lubricating oil 1 splashed up
1 lubricates the bearing 9, actually the oil reservoir chamber 7a
In addition to the oil that returns to the lower part, there is oil that flows out to the impeller 21 side through the axial gap 8a between the rotating shaft 24 and the hole in the lid 8, and this outflow lubricating oil 11 reaches the blade 23 due to centrifugal force and is The adhesion of dust leads to a decrease in measurement accuracy and loss of lubricating oil. Therefore, the present invention specifically adopts the following configuration to prevent these inconveniences.

Reference numeral 27 denotes a ring-shaped shaft sealing disk, which is arranged concentrically with the rotating shaft 24 on the outer surface of the lid 8 and is attached to the hub 22 of the impeller 21.
They are mounted and fixed facing each other on the sides. Disk 27
As shown in FIG. 2, for example, a pair of annular convex portions 27a having different diameters are formed on the opposing surface of the rotary shaft 24, respectively, so as to be concentric with the rotating shaft 24. A pair of annular recesses 22a are formed on the opposing surface of the hub 22, respectively facing the annular projections 27a.
7a and 22a mesh with each other to form a shaft sealing portion 28.

According to this shaft sealing part 28, when the impeller 21 rotates, the recessed part 22a rotates with a slight gap relative to the convex part 27a, but since the size of this gap is extremely small, the labyrinth effect is large. Therefore, the lubricating oil 11 that has entered the gap 8a is prevented from passing by the shaft seal 28 and cannot move toward the hub 22 and the blade 23, so that it does not leak. Therefore, lubricating oil 11
There will be no adhesion of dirt to the blade 23 or loss of lubricating oil 11 due to leakage. Further, since the shaft sealing portion 28 has a larger diameter than the conventional labyrinth formed on the outer periphery of the rotating shaft 24, the circumferential speed is also high and the sealing effect for the lubricating oil 11 is high. In addition, the processing and construction of the annular convex portions and concave portions 27a, 22a of the disk 27 and the hub 22 are simple, and the assembly is also simple.
4 is simply inserted through the disc 27.

In the above embodiment, the convex portion and the concave portion 27a,
The engagement of 22a includes a state in which both 27a and 22a do not contact each other at all or a state in which they partially contact each other, and essentially refers to a state in which a labyrinth can be formed between both 27a and 22a.

In the above embodiment, the convex portions and the concave portions 27a, 22
Reverse the configuration of a and add a concave part to the disc 27 and the hub 22.
A convex portion may be provided. If it is desired to increase the shaft sealing effect, a plurality of shaft sealing parts may be concentrically formed in multiple layers for one shaft sealing location.

As described above, the turbine meter of the present invention includes a rotating shaft to which an impeller is integrally fixed to the outside, a housing having a bearing for supporting the rotating shaft, and a housing provided in the housing to carry lubricating oil. A turbine comprising a reservoir chamber for storing oil, a splash plate that rotates with the rotating shaft and splashes the lubricating oil, and a swash plate that guides the lubricating oil splashed by the splash plate to the bearing. In the meter, an annular convex portion centered on the rotation axis is formed on one of the facing thrust surfaces of the impeller and the housing, and an annular concave portion that engages with the annular convex portion is formed on the other side to prevent lubricating oil from flowing. Since it has a shaft seal that prevents leakage in the impeller direction, there is no loss of lubricant due to lubricant leakage, which reduces costs, and also prevents lubricant from leaking and adhering to the impeller blades, causing dirt to form on the blades. This eliminates the possibility of adhesion and deterioration of measurement accuracy, and compared to conventional labyrinths that are formed around the outer circumference of the rotating shaft, the shaft seal is formed at a portion with a larger diameter than the outer circumference of the rotating shaft, making it larger. Sealing is performed at the circumferential speed, so the sealing effect is high, and the machining of the annular convex and concave parts is extremely easy compared to the conventional housing two-part labyrinth, and the construction and assembly work are also simple. This has the advantage of further reducing costs.

[Brief explanation of the drawing]

1 and 2 are a longitudinal sectional view of one embodiment of a turbine meter according to the present invention and an enlarged longitudinal sectional view of its essential parts, respectively. 1...Turbine meter, 2...Main body, 3, 4...
... Cone member, 5 ... Count display section, 6 ... Housing,
7...Housing, 7a...Oil sump chamber, 8...Lid,
8a... Gap, 9, 10... Bearing, 11... Lubricating oil, 21... Impeller, 22... Hub, 22a...
Annular recess, 23...blade, 24...rotating shaft,
25... splash plate, 27... shaft sealing disc,
27a... annular convex portion, 28... shaft sealing portion.

Claims (1)

[Scope of utility model registration request] A housing having a rotating shaft to which an impeller is integrally fixed to the outside, a bearing for supporting the rotating shaft, an oil reservoir chamber provided in the housing to store lubricating oil, and a housing that rotates together with the rotating shaft and has a bearing for supporting the rotating shaft. In a turbine meter consisting of a splash plate that splashes lubricating oil and a swash plate that guides the lubricating oil splashed by the splash plate to the bearing, An annular convex portion centered on the rotating shaft is formed on one of the two, and an annular concave portion that engages with the annular convex portion is formed on the other side to form a shaft sealing portion that prevents lubricating oil from leaking in the direction of the impeller. Turbine meter.