JPS62215828A - Rotor of turbine type flow meter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a rotating body of a turbine-type flow n″t41, and in particular is configured to improve the sliding strength of the rotating shaft and to accurately measure the minute flow ω. This relates to a rotating body with one turbine bottom flow.

2. Description of the Related Art Conventionally, in a turbine bottom flow meter used to measure the flow rate of fluid in a city gas cap, especially a turbine-type flow ff1K+ rotor used to measure a minute flow rate of less than IIl/n+in, the rotating body rotates according to the amount of 'Iri. Both ends of the rotating shaft of the impeller were machined into a spherical shape, and the rotating shaft was supported by a bearing section facing the impeller. However, in the above-mentioned conventional rotating body, the material of the rotating shaft has high hardness, so the dimensional accuracy between both ends of the n-rolling shaft was low, and the spherical accuracy was also low. Further, in order to solve the above-mentioned problems, a rotating body is being proposed in which, for example, a rotating shaft made of a super hard material or ceramic is attached to the center of an impeller made of synthetic resin. In addition, another turbine type flow f
As the rotating body of fi Kl, one is considered to have a structure in which a pipe-shaped rotating shaft with balls having high hardness installed at both ends is inserted through the center of an impeller.

Problems to be Solved by the Invention However, in the rotating body of the turbine bottom flow meter proposed above,
In the case of advance payment, 1 with the bearing that supports the rotating shaft! ! ! In order to reduce dynamic resistance, it is necessary to form a rotating shaft with a predetermined length and dimension by grinding a highly hard material such as ruby or saphire, resulting in enormous material and grinding costs. In addition, in the latter of the above-mentioned rotating bodies, it is necessary to use balls made of a highly hard material such as ceramic, and the heat resistance and strength of the balls and the rotating shaft made of pipes such as stainless steel are different, and the thermal deformation type and elastic deformation range are different. Because of the difference, there is a risk that cracks may occur in the rotating shaft. Therefore, there has been a need for a rotating body that solves the above problems, is inexpensive to manufacture, and has a highly viscous rotating shaft.

Therefore, the present invention aims to provide a rotating body for a turbine flowmeter that meets the above-mentioned needs.

Means and Effects for Solving the Problems The present invention provides a rotating body of a turbine type FFL m Kl having the above-mentioned configuration, in which the surface of the ball or the ball and the n-rotating shaft are provided at both ends of the rotating shaft so as to come into contact with the fixed bearing part. The surface of the rotary shaft is coated with a hard material, making it easier to improve the dimensional accuracy of the rotating shaft and improving the sliding strength of the rotating shaft, making it possible to measure the flow rate with high precision over a long period of time. .

Embodiment FIG. 1 shows an embodiment of a rotating body (hereinafter simply referred to as the rotating body) of a turbine flow meter according to the present invention.

The rotating body 1 shown in the figure is made of a light material such as synthetic resin.
It is composed of an impeller 2 that rotates according to the flow rate of the fluid to be measured, and a rotating shaft 3 inserted into the center of the impeller 2.

This rotating shaft 3 is shown on the surface of a rotating shaft 3' consisting of a shaft section 3a made of a metal pipe made of stainless steel, brass, etc., shown enlarged in FIG. It is coated with a hard material 5 (see FIG. 3). The balls 4a and 4b are made of an elastically deformable material such as iron or stainless steel, and their sphericity, two area degrees, and one dimension tIIi degrees are extremely high values. In general, the technology for manufacturing spheres has been established, and spheres with high precision can be manufactured relatively easily and at low cost. Further, the shaft portion 3a has a structure in which a metal pipe is cut into predetermined dimensions, and this also has high dimensional accuracy and can be manufactured at low cost.

The rotating shaft 3 is a ball 4a with the above-mentioned high precision.

4b is assembled by adhering it to the shaft part 3a which is also manufactured by YJ and has a high dimension vJ degree, and then the hard material 5 is coated on the surface by a low temperature plasma method, which makes it extremely easy and low cost. It can be manufactured in Further, the dimension between both ends of the rotating shaft 3 (indicated by arrows in FIG. 2) can be geometrically determined by taking into consideration the inner diameter dimension of the shaft portion 3a and the diameter dimension of the balls 4a, 4b. Moreover, the accumulated electricity can be maintained at a high level. However, the dimension between both ends of the rotary shaft 3 can be easily and precisely sized to a predetermined dimension to be supported on the bearing.

Roughly speaking, the rotor @3, which has balls 4a and 4b incorporated at both ends of the shaft portion 3a, is subjected to surface treatment before being incorporated into the impeller 2. That is, as shown in FIG. 3, the rotating shaft 3 is surface-treated to form a ball 4a.

The hard material 5a is coated on the surface of 4b, and the rotation i1
VJ on the front of 'd13! The green material 5b is covered. The hard materials 5a and 5b are evenly formed over the entire surface of the rotating shaft 3 with a substantially uniform thickness. Therefore, the ball 4a.

The surface of 4b is a hard material 5 with high hardness and high sphericity.
The frictional resistance against the bearing part is small because it is covered with a. Also,
The shaft portion 3a is strongly reinforced by being covered with a hard material 5b. The rotating shaft 3 configured as described above is press-fitted into the center of the impeller 2 to form the rotating body 1.

In the case of this embodiment, the hard material 5 coated on the surface of the rotating shaft 3
is formed by a low temperature plasma method. When coating the surface of the rotating shaft 3 with the hard material 5, first the rotating shaft 3 shown in FIG. ? Approximately 30 minutes in a vacuum chamber (not shown)
Heat to 0°C. At this temperature of 300° C., the treatment is performed for 4 hours using, for example, S i H4-NH3 reaction system gas. As a result, the ball 4a of rotation 1rIh3,
4b and the entire surface of the shaft portion 3a have a thickness of 4 with ultra-high wear resistance.
An 8!3N,+ film of ~8 μm is formed.

Furthermore, I! The hard material 5 coated on the surface of the IJ 11111i3 is not limited to the Si3N4 film mentioned above, but also a wear-resistant carbide.

Corrosion resistance: T i N, BN, Cr, Adz 0
3.

It may also be a film of 8iC, CrN, i-carbon (formed by CVD method, ie, chemical vapor deposition method), diamond, graphite, or the like.

Turbine type i-quantity meter 6 equipped with the rotating body 1 having the above configuration
is shown in Figure 4. As shown in the figure, the turbine bottom flow 2 total 6 is disposed inside the piping 7 to measure the flow of the fluid to be measured such as gas or fluid flowing inside the piping 7, and is roughly connected to the rotating body 1. A pair of cone members 8a.

8b, support@9a, 9b, etc. A pair of cone members 8a, 8b are arranged on the upstream side and downstream side, respectively, with the rotating body 1 in between, and support shafts 9a, 9b fixed in the pipe 7.
installed on. This pair of cone members 8a, 8b
Bearings 10a and 10b that rotatably support the rotation @3 of the rotating body 1 are provided at the center of the surface facing the rotating body 1. The bearing portions 10a and 10b are made of a material with excellent wear resistance. The rotating body 1 is mounted at a predetermined position by having its rotating shaft 3 rotatably supported by bearings 10a and 10b, and rotates in accordance with the flow of the fluid to be measured to detect the flow through a detection means (not shown). Perform fixed measurements.

The distance between the two bearing portions 10a, 10b is precisely defined to a predetermined dimension when attaching the pair of cone members 8a, 8b to the support shafts ga, gb. Also, both bearing parts 10a and 10b
The dimension between both ends of the rotating shaft 3 which is supported by the rotary shaft 3 is also manufactured to a predetermined dimension with high precision as described above. Therefore, the rotating shaft 3 is a bearing portion 10a.

The balls 4a, 4b are best supported by the hard material 5a on the surface of the ball 10b. For this reason, the rotating body 1
When rotating, the rotating shaft 3 and the bearing portion 10a.

There is no unnecessary frictional resistance between the parts 10b, and the rotating body 4 does not get stuck, and the flow meter can smoothly measure the flow rate. Further, in the rotating shaft 3, a bearing portion 10a,
A hard material 5a coated on the surfaces of the balls 4a and 4b is in direct contact with the ball 10b. As mentioned above, the balls 4a and 4b have excellent sphericity and two-face accuracy9, and the hard material 5 coated on their surfaces also has a uniform film thickness, so that the rotating shaft 3 and the bearing parts 10a and 10b The frictional resistance between them is reduced, and the accuracy of flow measurement in the microflow ω region can be improved. 2 In addition to this, ball 4a.

4b/fi Ball 4a because it has high surface accuracy.

The hard material 5a on the surface of 4b does not cause uneven wear even when the rotating body 1 rotates at high speed, and its durability is improved. Furthermore, since the shaft portion 3a of the rotating shaft 3 is a hollow metal pipe, its appearance is light and the weight of the rotating body 1 can be reduced, thereby making it possible to improve the accuracy of flow M measurement in a minute flow rate range. .

Further, since the balls 4a and 4b are made of metal which is more elastically deformable than ceramic or the like, there is no risk of them breaking. Generally speaking, since the balls 4a, 4b and the shaft portion 3a are both made of the same metal, there is a considerable difference in thermal deformation type and elastic deformation range, and cracks may occur in the shaft portion 3a. Prevented.

In the above explanation, the hard material 5 is coated on the entire surface of the rotating Φλ shaft 3 using a low-temperature plasma method, but the invention is not limited to this, and vf! A ball 4a coated with a texture 5 and then a hard phase 5.

4b may be incorporated into both ends of the shaft portion 3a to form the rotating shaft 3.

Effects of the Invention As described above, the rotating body of the turbine underflow 6 according to the present invention is coated with a hard material on the surface of the ball that contacts the fixed bearing part or on the surface of the ball and the rotating shaft. In addition, the spherical viscosity at both ends of the rotating shaft can be improved, and the sliding strength of the rotating shaft can be improved. Even when used continuously, uneven wear of the part of the rotary shaft that contacts the fixed bearing can be prevented, and the life of the flowmeter can be saved. In addition, since the surface of the ball is coated with hard 71, the frictional resistance between the ball and the fixed bearing part is reduced, making it possible to precisely measure minute flow rates. Sliding with uniform hard material coating on the surface? Ruby can easily form an excellent rotating shaft.

Since it is not necessary to use expensive materials such as refire and lamics, it is possible to improve the sliding strength of the rotating shaft in an inexpensive manner. Also, the natural deformation allowance between the rotating shaft and the ball)
Since there is almost no difference in the elastic deformation range, it is possible to prevent cracks from occurring in the ball or the rotating shaft, especially on the surface of the ball. By selecting the material of the hard material to be replaced, it is possible to obtain a rotating body that can meet the specifications required for the flowmeter 1.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of an embodiment of the rotating body according to the present invention, Fig. 2 is an enlarged sectional view of the rotating shaft, and Fig. 3 is a hard material on the surface of the rotating shaft shown in Fig. 2. FIG. 4 is a sectional view of the coated rotating shaft, and is a longitudinal sectional view of the rotating body shown in FIG. 1 mounted on a turbine underflow meter. DESCRIPTION OF SYMBOLS 1... Rotating body, 2... Impeller, 3, 3'... Rotating shaft, 3 a-- Shaft part, 4a, 4b-= Ball, 5, 5
:1°5b...Hard material.

Claims (10)

[Claims] (1) In a rotating body of a turbine flowmeter, in which balls are provided at both ends of the rotating shaft of an impeller that rotates in accordance with the flow rate of the fluid to be measured, the balls contacting a fixed bearing part, the surface of the balls or the balls and the rotating shaft. A rotating body of a turbine-type flowmeter, characterized in that the surface of the rotating body is coated with a hard material. (2) The rotating body of a turbine flowmeter according to claim 1, wherein the hard material is formed by a low-temperature plasma method. (3) The rotating body of a turbine flowmeter according to claim 1, wherein the hard material is Si_3N_4. (4) The rotating body of a turbine flowmeter according to claim 1, wherein the hard material is TiN. (5) The rotating body of a turbine flowmeter according to claim 1, wherein the hard material is BN. (6) The rotating body of a turbine flowmeter according to claim 1, wherein the hard material is i-carbon. (7) The rotating body of a turbine flowmeter according to claim 1, wherein the hard material is SiC. (8) The rotating body of a turbine flowmeter according to claim 1, wherein the hard material is Cr. (9) The rotating body of a turbine flowmeter according to claim 1, wherein the hard material is Al_2O_3. (10) The rotating body of a turbine flowmeter according to claim 1, wherein the hard material is CrN.