CN111637932A - A mechanical sensor type electronic water meter movement - Google Patents

Abstract

A mechanical sensor type electronic water meter movement eliminates the measurement precision error of the original water meter movement impeller in the high-low speed conversion process. The structure includes: 1, an upper gland, 2, a lower gland, 3, an impeller box, 4, a filter screen, 5, an antimagnetic gasket, 6, an impeller assembly and 7, sealing gaskets; an agate sleeve is arranged at the top of the inner hole of the impeller body; the top of the thimble is in contact with the lower end of the agate sleeve; the lower end of the inner side of the impeller body is inlaid with a glass ball bearing, and the glass ball bearing limits the axial direction and the radial direction of the impeller body on a shaft where the thimble is located, so that the impeller can only rotate around the thimble and cannot freely move along the axial direction and the radial direction. An antimagnetic gasket is arranged in the gland and shields the downward magnetic field of the magnetic rod of the impeller. The impeller is prevented from swinging when being impacted by large water flow or moving up and down when being stopped and started, and the metering precision of the water meter is ensured. The advantages are that: 1) the stability of impeller gesture has been guaranteed, has promoted water gauge measurement accuracy. 2) The process cost of the top cover is reduced, and the sealing performance of the movement of the base watch is improved.

Description

A mechanical sensor type electronic water meter movement

technical field

The invention provides a mechanical sensor type electronic water meter movement, which belongs to the technical field of flow measurement.

Background technique

The rotor-type mechanical water meter has a history of nearly 200 years. In order to meet the needs of modern remote meter reading, the "mechanical sensor-type electronic water meter" was produced in 2000. It is mainly composed of base table and circuit box. The circuit box is the carrier of the single board computer. The single-board computer in the circuit box collects the signal from the top of the impeller in the base meter, samples, calculates, processes and transmits the status and reading of the water meter to the rotational speed and number of revolutions of the impeller.

The base table part, that is, on the basis of the water meter movement composed of the impeller and the impeller box of the rotary-wing mechanical water meter, cancels the mechanical gear set counting box part at the rear of the impeller drive. No matter how the mechanical or electronic age is replaced, the design and manufacture of the movement of the water meter-based watch composed of the impeller and the impeller box are the key components of the metering accuracy and reliability of the water meter.

In the practice of more than ten years, it is found that the water meter impeller without the mechanical gear set as the inertia retainer has higher sensitivity, but also loses its stability under the impact of water flow, and the measurement accuracy becomes uncertain. The structure and shape of the impeller, especially the specific gravity, have a great influence on the repeatability of the water meter.

In 2014, water meter researchers in Europe published a paper stating that "the metering accuracy of the fluid is best when the water meter impeller is in zero gravity in the water". Inspired by this, the inventor applied for an invention patent (CN108469280A) and a series of subsequent patents in 2017 for "a mechanical sensor-type electronic water meter".

In 2018, the remote water meters invented in this series were mass-produced. The most critical technology is to improve the movement and impeller structure of the base part of the traditional water meter. In the application in the following years, it was found that the stability and accuracy of the measurement of this impeller have been greatly improved compared with the previous ones. However, the following major flaws still exist:

(1) The impeller only has an upper thimble fulcrum. When it rotates at high speed, it relies on the rotational inertia of the impeller to maintain and can run stably; but at low speed, there is almost no rotational inertia, and it loses stability.

(2) The limit clearance of the impeller in the axial direction is relatively large: when the impeller is stationary or the water flow is slow, the impeller falls on the ball of the thimble and rotates; when the water flow is large, the impeller rises, and the steel ball on the top of the impeller rotates on the lower plane of the top cover. When it is switched between the two attitudes, the impeller loses friction, resulting in accelerated rotation, so the metering curve of the water meter has a shear point at this stage, losing stable operation, and affecting the metering accuracy of the water meter.

(3) The radial limit clearance of the impeller is relatively large: the radial limit device at the lower part of the impeller has only a stable sleeve. There is a large gap between it and the thimble. When the water flow loses its steady state, the impeller will sway from side to side. The stability sleeve will hit the lower part of the thimble; or the impeller rotor blade will hit the inner wall of the impeller box, thus affecting the metering accuracy of the water meter.

SUMMARY OF THE INVENTION

The present invention proposes a mechanical sensor type electronic water meter movement, the purpose of which is to eliminate the measurement accuracy error of the impeller in the high and low speed conversion process by improving the water meter impeller structure of the movement and aiming at the problems existing in the above-mentioned prior art. , to provide a mechanical sensor type electronic water meter with high precision measurement, especially the movement of the mechanical sensor type electronic water meter that meets or exceeds the requirements of the national water meter accuracy grade. This is after nearly a hundred trials, and it took a year to improve it.

Technical solution of the present invention:

A mechanical sensor type electronic water meter movement, the structure of which includes: an upper gland, a lower gland, an impeller box, a filter screen, an impeller assembly, and a sealing gasket; an impeller assembly is installed in the impeller box, and an upper gland and an impeller box are arranged at the top of the impeller box. Lower the cover, the lower part of the impeller box is equipped with a filter screen, and the filter screen and the impeller box are fixed with the water meter shell through the sealing gasket. The structure of the impeller assembly includes: an agate sleeve, an impeller body, a thimble, and a glass ball bearing; wherein, an agate sleeve is installed on the top of the hole in the impeller body; the top of the thimble is in contact with the lower end of the agate sleeve; the lower end of the inner side of the impeller body is inlaid with a glass ball bearing .

As a preferred solution, a magnetic rod is installed on the upper part of the impeller body, and the magnetic rod is made of fir-cobalt material, and the magnetic field strength is at least 2200Gs. It ensures that the redundancy of the magnetic field required by the sensor of the electronic water meter circuit box reaches 4-5 times.

As a preferred solution, the gland includes an upper gland and a lower gland, and an anti-magnetic gasket is provided on the hole wall at the opening in the lower gland; the top of the impeller body passes through the opening in the lower gland to ensure The magnetic bar is located above the anti-magnetic washer, shielding the downward magnetic field of the impeller magnetic bar, so that the rust in the water flow below the impeller will not be attracted by the downward magnetic field of the impeller magnetic bar, avoiding the fatal drawback that the magnet attracts rust and blocks the impeller movement.

As a preferred solution, two symmetrical air guide holes are provided on the upper side of the impeller body perpendicular to the axial direction. When the water flow enters the inner cavity of the water meter impeller, the air in the center hole of the impeller is discharged from the air guide hole, so that no air remains in the center hole of the impeller. When the impeller rotates in flowing water, there is only a constant friction force, which eliminates the influence of residual air buoyancy on the stability of the measurement accuracy of the mechanical sensor type electronic water meter.

As a preferred solution, the glass ball bearing structure includes: a bearing frame, glass balls and a ball cover; the bearing frame is fixedly installed in the inner cavity of the lower end of the impeller body. The bearing frame has 3 radial round holes, and each hole is equipped with a glass ball. The axial limit of the glass ball is in the arc-shaped groove in the middle and lower part of the thimble; the ball cover embedded in the bearing frame limits the radial direction of the glass ball. The impeller can only rotate around the axis of the thimble, but cannot move freely in the axial and radial directions. It avoids the impeller swinging when the large water flow hits, or the up and down movement when stopping and starting, which ensures the metering accuracy of the water meter.

The structure of the agate sleeve, the small magnetic rod, the thimble and the lower glass ball bearing greatly reduces the specific volume of the material. This ensures that the overall specific gravity of the impeller is reduced to 1.05 g/cm3, which is close to the specific gravity of water.

As a preferred solution, the bearing frame is made of polytetrafluoroethylene material with strong lubricating properties. Because the space between the impeller and the thimble is very narrow, the traditional ball bearing structure cannot be directly adopted. Especially in the water environment, in order to reduce the specific gravity and prevent corrosion, the bearing frame can only be made of polytetrafluoroethylene plastic.

Beneficial effects of the present invention:

1) The ball bearing in the center of the impeller thimble achieves the effect of limiting the axial and radial positions of the impeller, ensuring the stability of the impeller attitude and improving the measurement accuracy of the water meter.

2) Compared with the original technology, the design of the top cover and the sealing ring is cancelled. The integrated design of the cover reduces the process cost and improves the sealing performance of the base watch movement.

3) The new impeller assembly can be used to replace the parts of the old water meter, which improves the stability of the measurement accuracy and reduces the replacement cost.

Description of drawings

Accompanying drawing 1 is the structural representation of the mechanical sensor type electronic water meter base meter of the present invention;

Accompanying drawing 2 is the structural representation of electronic water meter base meter and impeller mechanism in the prior art;

Accompanying drawing 3 is the structural representation of impeller assembly;

Accompanying drawing 4 is the three-dimensional three-dimensional split view of impeller body and thimble;

Figure 5 is a schematic structural diagram of a glass ball bearing.

In Figure 1:

1 is the upper gland, 2 is the lower gland, 3 is the impeller box, 4 is the filter screen, 5 is the anti-magnetic gasket, 6 is the impeller assembly, and 7 is the gasket;

In Figure 3:

601 is an agate sleeve, 602 is a magnetic rod, 603 is an air guide hole, 604 is an impeller body, 605 is a bearing frame, 606 is a thimble, 607 is a glass ball, and 608 is a ball cover.

Detailed ways

The technical solutions of the present invention will be further explained below with reference to the accompanying drawings.

1, a mechanical sensor type electronic water meter movement, its structure includes: an upper pressure cover 1, a lower pressure cover 2, an impeller box 3, a filter screen 4, an impeller assembly 6, a gasket 7; the impeller box 3 is installed in The impeller assembly 6, the top of the impeller box 3 is provided with a pressure cover, the pressure cover includes an upper pressure cover 1 and a lower pressure cover 2, and an antimagnetic gasket 5 is arranged on the hole wall of the opening in the lower pressure cover 2; the impeller The top of the assembly 6 passes through the opening in the lower cover 2 . The lower part of the impeller box 3 is a filter screen 4 , and the filter screen 4 and the impeller box 3 are fixed to the water meter housing through a gasket 7 .

3 and 5, the structure of the impeller assembly 6 includes: an agate sleeve 601, a magnetic rod 602, an air guide hole 603, an impeller body 604, a thimble 605, and a glass ball bearing; wherein, the top of the inner hole of the impeller body 604 is installed The agate sleeve 601; the top of the thimble 605 is in contact with the lower end of the agate sleeve 601; the inner lower end of the impeller body 604 is inlaid with a glass ball bearing. A magnetic bar 602 is installed on the upper part of the impeller body 604, and the magnetic bar 602 is made of fircobalt material, and the magnetic field strength is at least 2200Gs, which ensures that the redundancy of the magnetic field required by the sensor of the electronic water meter circuit box reaches 4-5 times.

The magnetic bar 602 is placed above the anti-magnetic washer 5 to shield the downward magnetic field of the impeller magnetic bar 602, so that the rust in the water flow below the impeller will not be attracted by the downward magnetic field of the impeller magnetic bar 602, so as to prevent the magnet from attracting the rust and blocking the movement of the impeller. fatal flaw.

Two symmetrical air guide holes 603 are formed on the upper side of the impeller body 604 perpendicular to the axial direction. When the water flow enters the inner cavity of the impeller of the water meter, the air in the center hole of the impeller is discharged from the air guide hole 603, so that no air remains in the center hole of the impeller; when the impeller that discharges the air rotates in the flowing water, there is only a constant friction force, which eliminates the The air residual buoyancy affects the stability of the measurement accuracy of the mechanical sensor type electronic water meter.

The glass ball bearing structure includes: a bearing frame 605, glass balls 607 and a ball cover 608; the bearing frame 605 is fixedly installed in the inner cavity of the lower end of the impeller body 604, and the glass ball 607 is installed in the radial hole of the bearing frame 605 middle. The axial limit of the glass ball 607 is in the arc-shaped groove in the lower part of the ejector pin 606 ; the ball cover 608 embedded in the bearing frame 605 limits the radial direction of the glass ball 607 . Both the axial and radial directions of the impeller body 604 are limited to the shaft where the ejector pin 606 is located.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. The equivalent replacement or change of the inventive concept thereof shall be included within the protection scope of the present invention.

Claims (7)

1. A mechanical sensor type electronic water meter movement, the structure of which includes: an upper gland, a lower gland, an impeller box, a filter screen, an impeller assembly, and a gasket; an impeller assembly is installed in the impeller box, and a gland is provided at the top of the impeller box. , the lower part of the impeller box is a filter screen, and the filter screen and the impeller box are fixed with the water meter shell through a sealing gasket; it is characterized in that the impeller assembly, its structure includes: agate sleeve, impeller body, thimble, glass ball bearing; An agate sleeve is installed on the top of the hole; the top of the thimble is in contact with the lower end of the agate sleeve; and the lower end of the inner side of the impeller body is inlaid with a glass ball bearing. 2 . A mechanical sensor type electronic water meter movement according to claim 1 , wherein a magnetic rod is installed on the upper part of the impeller body, and the material of the magnetic rod is samarium cobalt material. 3 . 3. A mechanical sensor type electronic water meter movement according to claim 2, wherein the magnetic field strength generated by the magnetic rod is 4-5 times the magnetic field required by the electronic water meter circuit box sensor. 4. A mechanical sensor type electronic water meter movement according to claim 2, characterized in that the pressure cover comprises an upper pressure cover and a lower pressure cover; an antimagnetic gasket is provided on the hole wall at the opening in the lower pressure cover ; The top of the impeller body passes through the anti-magnetic washer to ensure that the magnetic rod is located above the anti-magnetic washer and shields the downward magnetic field of the impeller magnetic rod. 5 . The mechanical sensor type electronic water meter movement according to claim 1 , wherein two symmetrical air guide holes are opened on the upper side of the impeller body perpendicular to the axial direction. 6 . 6. A mechanical sensor type electronic water meter movement according to claim 1, wherein the glass ball bearing structure comprises: a bearing frame, glass balls and a ball cover; the bearing frame is fixedly installed on the lower end of the impeller body In the inner cavity, glass balls are installed in the radial holes of the bearing frame; the glass balls are axially limited to the arc groove in the middle and lower part of the thimble, and the ball cover embedded in the bearing frame limits the radial direction of the glass balls, and the impeller The axial and radial directions of the body are limited to the axis where the thimble is located. 7 . The movement of a mechanical sensor type electronic water meter according to claim 6 , wherein the bearing frame is made of polytetrafluoroethylene. 8 .

Images