JP2002250646A - Gearing for flow measurement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gearing for flow measurement capable of measuring a flow, even under high pressure and which for which a fluid will not leak out to the outside. SOLUTION: This gearing 10 for flow measurement generally comprises a housing 12, a pair of gears 14 and 14 mounted within the housing 12, first O-rings 16 disposed in both side surfaces of each gear 14, second O-rings 18 each disposed between a shaft 14a of each gear 14 and the housing 12, and a sensor 20 for measuring the amount of rotation of the shafts 14a of the gears 14. The fluid moves from an inlet 12c of the housing toward an outlet 12d thereof, by the rotation of the gears. The amount of moving fluid is precisely measured by the amount of rotation of the gears 14. The pressure of grease inside the first O-rings 16 efficiently cancels that of the fluid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear device for measuring a flow rate, and more particularly to a gear device for measuring a flow rate of a fluid such as an adhesive which is hardening while injecting the fluid at a high pressure. .

[0002]

2. Description of the Related Art Japan has long been a concrete society. Defects leading to serious accidents such as minor damage such as cracks and cracks, and detachment and collapse of lumps have also begun to appear in such concrete structures. In order to maintain such a concrete society and operate effectively without harming the environment, it is preferable to repair them so that they can be used permanently. That is, a strong adhesive or a waterproofing agent is injected and fixed around the cracked, cracked, or separated mass. Many such specialty agents have been developed, and environmentally harmless construction methods have been developed one after another, and problems have begun to arise. The first and major problem is
The inability to measure the injection volume accurately. In order to maintain the concrete society and synchronize with the environment in the future, the amount and speed of the chemical to be injected, the type and procedure of the chemical to be injected, and the temperature of the concrete at that time and the ambient Need to adjust to the temperature. For that purpose, it is premised that the injection amount of the chemical solution is surely grasped. By accumulating such data quantitatively and studying it, it becomes possible to obtain the optimal amount of the drug solution to be injected.

[0003]

However, such a chemical solution is generally used by mixing a plurality of raw materials.
The chemical starts to harden immediately after mixing, and the flow rate is measured while injecting this at a high pressure, for example, 15 MPa. Conventional flow meters do not withstand such high pressures, and the chemical liquid has solidified in the flow meter and has become unusable. Alternatively, in view of the circumstances described above, the disassembly and cleaning is required about once every four hours, but there is no high-pressure-capable one that can be disassembled and cleaned.

Accordingly, an object of the present invention is to provide a gear device for measuring a flow rate which can measure a flow rate even under a high pressure and does not leak a fluid to the outside. The present invention
Another object of the present invention is to provide a gear device for flow measurement that can easily and inexpensively offset the pressure of the fluid applied to the first sealing means by using a gear shaft. Another object of the present invention is to provide a gear device for flow measurement that can be easily and inexpensively disassembled and cleaned. It is still another object of the present invention to provide a gear device for flow measurement that can easily and reliably measure a flow rate.

[0005]

According to a first aspect of the present invention, which fulfills the above object, a pair of gears are mounted inside a housing so as to be rotatable in opposite directions about an axis.
The meshing part of the pair of gears is sealed in a liquid-tight manner so that fluid cannot pass through, so that the fluid entering the housing from the inlet provided on one side of the housing enters between the gear teeth. In a gear device configured to be conveyed in the circumferential direction with the rotation of the gear and discharged from an outlet provided on the side opposite to the inlet of the housing, fluid flowing in a direction toward a radial center on both side surfaces of the gear. First sealing means for preventing leakage of fluid, and second sealing means between the shaft and the housing for preventing leakage of fluid in a direction toward the outside of the housing, and the first sealing means. A second fluid for canceling the pressure of the fluid applied to the first sealing means can be filled in a space located in the center direction of the first sealing means.

Fluid is confined between the housing and the pair of gears by first sealing means located on both sides of the gear and second sealing means located between the shaft and the housing. Move only from the inlet to the outlet of the housing by the rotation of the gears. The amount of fluid that moves can be accurately grasped by the amount of rotation of the gear. Further, by filling the space located in the center direction of the first sealing means with the second fluid, the pressure of the fluid applied to the first sealing means can be offset.

According to a second aspect of the present invention, there is provided the gearing for flow measurement according to the first aspect, wherein the shaft has a center hole extending to the vicinity of the center of the shaft, and a radial direction from a depth of the center hole. At least one lateral hole extending to the outer surface is provided, and a nipple member fluidly connectable to the center hole is fixed to the outer end of the shaft.

A center hole and a side hole are easily and inexpensively manufactured on a shaft by machining, and a conventionally well-known nipple member is attached to the shaft to form a second hole in a space located in the center direction of the first sealing means. , For example, grease. The third aspect of the present invention is the first aspect.
Or the gear device for flow measurement according to 2, wherein the housing is configured to include a housing main body having a space for accommodating a pair of gears, and a detachable cap attached to the housing main body in a liquid-tight manner. It is characterized by. The cap is detachably fixed to the housing body using a fastening device such as a bolt. Thereby, disassembly and cleaning can be performed extremely easily.

According to a fourth aspect of the present invention, in the gear device for flow measurement according to any one of the first to third aspects, a sensor for detecting the number of rotations of the shaft is provided. It is characterized by measuring the flow rate. The amount of fluid delivered by the gearing for flow measurement can be measured by the amount of fluid trapped between the housing and the pair of gears and the rotation of the gears. Since the amount of fluid trapped between the housing and the pair of gears is constant,
Eventually, the flow rate can be measured by measuring the number of rotations of the gear.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a gear device for measuring a flow rate according to the present invention. FIG. 1 is a longitudinal sectional view of one embodiment of a flow measuring gear device according to the present invention, and FIG. 2 is a right side view of the flow measuring gear device shown in FIG. 1 with a cap removed. is there.

As shown in FIG. 1, a gear device 10 for measuring a flow rate according to the present invention is schematically shown in FIG.
2, a pair of gears 14, 14 mounted inside the housing 12, first O-rings 16 arranged on both sides of each gear 14, a shaft 14a of the gear 14, and the housing 1
2 and a second O-ring 18 disposed between
And a sensor 20 for measuring the amount of rotation of the shaft 14a of the gear 14. In the illustrated preferred embodiment, the housing 12 comprises a housing body 12a having a space for accommodating a pair of gears 14, 14 and a detachable cap 12b liquid-tightly attached to the housing body 12a by four bolts 15. It is comprised including. Thereby, disassembly and cleaning can be performed very easily. The housing 12 can be cast from an aluminum alloy so that it can withstand high pressure.

A pair of gears 14 are housed in the housing 12.
They are mounted to be rotatable in opposite directions about a shaft 14a. The gear 14 includes a shaft 14a and a gear body 14b fixed to the shaft 14a.
Teeth 14c are formed at equal intervals on the periphery of 4b.
The meshing portion (center portion in the figure) of the pair of gears 14 is sealed in a liquid-tight manner so that fluid cannot pass through.
Therefore, the inlet 1 provided on one side of the housing 12
Fluid entering the housing 12 from the housing 2c enters between the teeth 14c of the gear 14 and is carried in the circumferential direction with the rotation of the gear 14, and is discharged from the outlet 12d provided on the side of the housing 12 opposite to the inlet 12c. It has become so.

A circular shallow groove 1 is formed on both sides of the gear body 14b.
4d is formed inside the first O-ring 16
Are fitted and arranged. The first O-ring 16 installed between the inner surface of the housing 12 and the side surface of the gear body 14b prevents fluid leakage in the direction toward the radial center. A shallow groove 14e is formed on the outer surface of the journal portion of the shaft 14a so as to make a circuit in the circumferential direction, and a second O-ring 18 is fitted inside the shallow groove 14e. A second O-ring 18 provided between the journal surface of the housing 12 and the shaft 14a prevents fluid leakage in the direction toward the outside of the housing 12.

The space located in the center direction of the first O-ring 16 is filled with high-pressure grease by a grease filling mechanism described later. The high-pressure grease and the fluid moved in the housing 12 balance and maintain the first O-ring 16 in a predetermined position. As a mechanism for filling such grease at high pressure, in the illustrated preferred embodiment, a central hole 14f extending to the vicinity of the center of the shaft 14a, and a radially extending inner portion of the central hole 14f extends radially from the outer surface. At least one horizontal hole 14g is provided. A grease nipple member 17 that can be fluidly connected to the center hole 14f is screwed to the outer end of the shaft 14a.

A center hole 14f and a lateral hole 14g are formed on the shaft 14a by machining at low cost simply and inexpensively, and a conventionally known nipple member 17 is attached to the center hole 14f and the lateral hole 14g. Thereby, for example, in the space located in the center direction of the first O-ring 16,
Grease can be filled at a high pressure. Gear 14
The rotation speed of the shaft 14a, that is, the rotation speed of the shaft 14a is measured by the sensor 20, and the flow rate of the fluid passing through the gear device 10 is measured from the rotation speed. The amount of fluid sent by the flow measurement gear device 10 is determined by the housing 12 and the pair of gears 14,
14 and the amount of rotation of the gear 14. Since the amount of the fluid confined between the housing 12 and the pair of gears 14 is constant, the flow rate can be measured by measuring the number of rotations of the gear 14.

The gear device 10 can measure the flow rate of the time-curable adhesive with an accuracy of 5% or less in the vertical direction. In addition, since it becomes possible to almost completely prevent the sent fluid from touching air, for a long time, for example,
It can be used continuously for more than 4 hours. Further, in the gear device 10 of the present invention, since the structure of the housing 12 and the mechanical strength of the pair of gears 14 and 14 can be extremely increased, the flow rate can be measured even with a high-pressure fluid such as 15 MPa. Became possible. The gear train 10 of the present invention can also be extremely compact and lightweight. In addition, the number of rotations of the shaft 14a can be measured by pulsing with a sensor 20 such as an encoder and counting, and thus the flow rate can be measured.

[0017]

According to the invention, first sealing means for preventing fluid leakage in the direction toward the radial center are provided on both side surfaces of the gear, and between the shaft and the housing, the first sealing means faces the outside of the housing. A second sealing means for preventing leakage of fluid in the first direction is provided, and a second fluid for canceling the pressure of the fluid applied to the first sealing means is positioned in the center direction of the first sealing means. Since the space can be filled, there is an effect of providing a gear device for flow measurement that can measure the flow even under high pressure and does not leak the fluid to the outside.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of a gear device for flow measurement according to the present invention.

FIG. 2 is a right side view of the flow measurement gear device shown in FIG. 1 with a cap removed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Gear device 12 Housing 12a Housing body 12b Cap 12c Inlet 12d Outlet 14 Gear 14a Shaft 14b Gear body 14c Teeth 14d, 14e Shallow groove 14f Center hole 14g Side hole 15 Bolt 16 First O-ring 17 Nipple member 18 Second O-ring 20 sensors

Claims (4)

[Claims] 1. A pair of gears are mounted inside a housing so as to be rotatable in opposite directions about an axis, and a meshing portion of the pair of gears is liquid-tightly sealed so that fluid cannot pass through. Therefore, fluid entering the housing from the inlet provided on one side of the housing enters between the gear teeth and is carried in the circumferential direction with the rotation of the gear, and is provided on the opposite side to the inlet of the housing. In a gear device configured to be discharged from an outlet, a first sealing means for preventing leakage of fluid in a direction toward a radial center on both sides of the gear, and between the shaft and the housing. A second sealing means for preventing leakage of a fluid in a direction toward the outside of the housing is provided, and a second fluid for canceling a pressure of the fluid applied to the first sealing means is supplied to the first sealing means. Fill space located in the center direction A gear device for flow measurement characterized by being made possible. 2. The gear device for flow measurement according to claim 1, wherein the shaft has a center hole extending to near a center of the shaft.
At least one lateral hole extending radially from the inner part of the center hole to the outer surface is provided, and a nipple member fluidly connectable to the center hole is fixed to an outer end of the shaft. A gear device for flow measurement, comprising: 3. The gear device for flow measurement according to claim 1, wherein the housing has a housing main body having a space for accommodating a pair of gears, and a detachable cap attached to the housing main body in a liquid-tight manner. And a gear device for flow measurement. 4. The gear device for flow measurement according to claim 1, further comprising a sensor for detecting a rotation speed of the shaft, and measuring the flow rate from the rotation speed. Characteristic gear device for flow measurement.