JPS59202026A - Sliding-type blade flow-meter - Google Patents

Abstract

PURPOSE:To decrease a pressure angle of cam and improve accuracy of measurement eliminating shocks and wear, by forming an inscribing cam on which a cam roller attached on the trailing end of blade rolls on the inside surface cut out of top end bottom covers. CONSTITUTION:Upon introducing liquid from an inlet port 2, dynamic pressure of liquid is applied on a blade 9b to bring a rotor 7 into rotation and a cam roller 11 attached to the blade 9a rolls along a inscribing cam 14 allowing the blade 9a to proceed from the inside of rotor 7 to outside and thus, a measuring chamber is formed by mutually neighboring blades 9a, 9b, a major are surface 1a of the main body 1 and rotor 7. When the rotor 7 begins to rotate from this condition, the blade 9b, a recedes into the rotor 7 inside a displacing groove 8. On the other hand, another blade 9d positioned to face against the blade 9b begins to be separated from a minor arc surface 1b of the main body 1 and outward acting force, contary to the blade 9b, works, advancing forward inside the displacing groove 8, beginning to form the next measuring chamber.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flow meter having a sliding brake 1.

Conventionally, as shown in FIGS. 1 and 2, a flowmeter having a sliding plate has a rotor 102 integrally fixed to a rotor shaft 101 which is disposed at the center of the flowmeter and is freely rotatable. There are four plates 103 that can move in and out as the rotor 102 rotates, or brakes that are slidably housed in the radial direction of the rotor 102 and are located at opposite positions.
103 are connected by a connecting lot 104. Cam rollers 105 are rotatably supported at both ends of the plate 103, and these cam rollers 105 are mounted on the inside of the upper and lower lids 107 and 108 of the main body 106 of the flowmeter, with the two opposing cam rollers 105 serving as one wheel. It is configured to rotate by holding a plate cam 109 attached to the center. This plate cam 109 has a cam surface corresponding to the large arc surface 106a and the small arc surface 10[3b of the main body 106, and the plate cam 109 allows the play i' 103 to move in and out as it rotates. There is.

Therefore, the rotation of the rotor 102 is transmitted to a rotation take-out mechanism (not shown) provided in the upper lid and takes out the rotation of the rotor 102 via the rotor shaft 101, and as displayed on the flow rate display section 110. It has become.

However, in this configuration, since the cam surface of the plate cam is the outer peripheral surface, the pressure angle of the cam becomes large, which tends to cause shock and wear. In addition, when a large amount of fluid flows, the movement of the plate becomes irregular, causing large vibrations and shocks, producing noise, and there are problems in that it is difficult to expect an improvement in measurement accuracy in flow rate measurement.

The present invention was devised for the purpose of solving the above problems and providing a sliding blade flowmeter with a simple structure.One embodiment of the present invention will be described below with reference to FIGS. 3 to 5. do.

In FIGS. 3 and 4, 1 is the main body of the flowmeter,
It has an inlet 2 and an outlet 3.

The main body 1 has a cylindrical shape with a large arc surface 1a and a small arc surface 1b facing each other on the inner surface. and are placed with their centers aligned. The rotor 7 is integrally fixed to a rotor shaft 5 which is rotatably supported by the bearing 4, and the rotor shaft 5 is connected to a rotation take-out mechanism (not shown) connected to the flow rate display section 6. The rotor 7 has the same arc as the small arc surface 1b so that it rotates close to the small arc surface 111, and a gap is provided between the rotor 7 and the small arc surface 1b to prevent liquid from leaking. It is being

Four sliding grooves 8 are cut into the rotor 7 at equal intervals in the circumferential direction and passing through the rotor in the axial direction. A plate 9 is housed in each of the sliding grooves 8 so as to be slidable in the radial direction of the rotor.
are connected by a connecting rod 10 passing through the rotor 7 and rotor shaft 5. This connecting rod 10 is screwed onto one plate '9a, and is locked to the other blade 9C by a pin, so that the distance between these two plates i'9a, 9c can be freely adjusted.

Further, cam rollers 11 are movably attached above and below the retreating ends of these blades 9, respectively, and these cam rollers 11 are respectively formed on an upper cover 12 and a lower cover 13 attached to the upper and lower sides of the main body 1 of the flowmeter. It is in contact with the cam surface of the internal cam 14. The internal cams 14 are formed on the inner surface of the winter coats 12 and 13, respectively, and two opposing cam rollers 11 are rotated in contact with the cam surfaces. This internal cam 14 is formed at least inside the outer diameter of the rotor 7, so that the spaces near both ends of the rotor are closed by the end faces of the lids 12 and 13. This internal cam 14 is a large arc of the main body 1 as shown in FIG.
? It has a large circular cam surface and a small circular cam surface that correspond to the jila and the small circular arc surface 1b, and these large circular cam surfaces and small circular cam surfaces are smoothly connected by a connecting cam surface that rotates in contact with the cam roller 11 at all times. The internal cam 14 restricts the sliding movement of the blade 9.

Further, a bin 15 is inserted through the upper retreating end of the blade 9 perpendicularly to the plate 9, and support rollers 16 are rotatably attached to both ends of the bin 15 with the blade 9 sandwiched therebetween. This support roller 16 is configured to roll along a kite 17 formed along the sliding groove 8 at the upper end of the rotor and support the plate 9.

In the above flowmeter, when liquid flows in from the inlet 2,
The dynamic pressure of the liquid is applied to the plate 91, and the rotor 7 starts rotating. When the rotor 7 rotates, the force 180-ra 11 attached to the plate 9a rolls along the internal cam 14, causing the brake F9a to advance outward from the inside of the rotor 7, causing the adjacent plates 9a, 9b and the main body to move forward. 1 large arc surface 1a
and rotor 7 form a measuring chamber. When the rotor 7 rotates from this state, the plate 1''9b retreats into the rotor 7 within the sliding groove 8.In this embodiment, the flow rate display section 6 of the flow meter is placed upward, so that all The supporting roller 16 of the plate 9 rolls in the guide groove 17 of l':1-7, so that the plate 9 can smoothly reciprocate.The retreat of the plate 9b is regulated on both its upper and lower sides. Therefore, the force that directs the blade 9b toward the center of the rotor tuff is applied equally from the upper and lower inner cams 14 to both upper and lower sides of the blade 9b, and the play 1'' 9b slides stably and smoothly. On the other hand, when the other plate 9d located opposite the plate 9b begins to separate from the small arcuate surface 1b of the main body 1, an outward force acts in the opposite direction to the plate 9b, causing the inside of the sliding groove 8 to move outward. move forward and begin forming the next weighing chamber.

When the rotor 7 further rotates, the cam roller 11 of the plate 9b reaches the small circular cam surface of the internal cam 14, and the play 1''
9b is completely accommodated within the sliding groove 8. Therefore, the blade 9b rotates with a slight distance from the small arcuate surface 1b of the main body 1.

As explained above, in the present invention, the internal cam, on which the cam roller attached to the retreating end of the plate rolls, is formed on the inner surface of the hollowed-out upper and lower lids, so that the cam becomes larger than before, so the pressure angle of the cam becomes smaller and has better impact resistance.

At the same time, since the pressure angle of the cam becomes smaller, the necessary contact pressure becomes smaller, which improves the wear resistance of the cam surface and extends the life. In addition, since the cam roller transfers the internal cam formed on the lid, the sliding movement of the plate becomes smoother mechanically and kinematically, reducing vibration and noise of the flowmeter, and reducing the flowmeter's measurement. Accuracy is greatly improved. Furthermore, since each of the internal cams can be machined simultaneously with the lid, the number of parts can be reduced, and the assembly and adjustment time can be shortened.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional plan view of a main part showing a conventional example, FIG. 2 is a cross-sectional view of a main part along line A-A in FIG. 1, FIG. 3 is a cross-sectional plan view of a main part of the present invention, and FIG. FIG. 3 is a cross-sectional view of the main part taken along line BB in FIG. 3, and FIG. 5 is a bottom view of the top cover shown in FIG. 4. 1 is the main body, la is the large arc surface, 1b is the small arc surface, 2 is the inlet, 3 is the outlet, 4 is the bearing, 5 is the rotor shaft, 6 is the flow rate display, 7 is the rotor,
8 is a sliding groove, 9 is a plate, 10 is a connecting rod, 11 is a cam roller, 12 is an upper lid, 13 is a lower lid, 14 is an internal cam, 15 is a pin, 16 is a support roller, 17 is a power tray, Patent applicant Nitto Seiko Co., Ltd.

Claims (1)

[Claims] 1) A large arcuate surface 1a and a small arcuate surface 1b are formed on the inner wall of the main body 1 having an inlet 2 and an outlet 3, and a sliding groove 8 and a small arcuate surface 1b are formed in the main body 1. In a flowmeter, a rotor 7 having a plate 9 that can freely slide in the radial direction is arranged concentrically and rotatably with a slight gap from the small circular arc surface 1b, and cam rollers are installed at both ends of the retreating end of the plate 9. The cam rollers 11 of the plate 9 located at opposite positions are brought into contact with the cam surfaces of the internal cams 4 formed on the upper cover 12 and the lower cover 13 located on both ends of the rotor. A sliding blade flowmeter characterized in that movement of the plate 9 is restricted by a contact cam 14. 2) The inscribed cam is a large arc surface 1a and a small arc surface 1b of the main body 1.
The first aspect of the present invention is characterized in that it has a small circular cam surface and a large circular cam lTi'i corresponding to the cam surfaces, respectively, and these large and small circular cam surfaces are connected by a connecting cam surface that is in constant contact with the cam roller 11. Sliding plate flowmeter as described in section.