Precise flow sensor

Abstract

The utility model discloses a precise flow sensor, relates to the technical field of flow sensors, and aims to solve the problems that when waist wheels of an existing flow sensor rotate, certain gaps exist between the waist wheels and between the waist wheels and a shell when the waist wheels are parallel, and at the moment, the lower the viscosity of fluid is, the higher the leakage amount of the fluid flowing out of the gaps is, and the flow sensor is damaged. Therefore, the detection precision of the flow sensor is easily influenced. The mounting seats are arranged at the upper and lower ends of the inlet flange and the outlet flange, the mounting seats are fixedly connected with the detection bin, a sealing plate is mounted at one end of each mounting seat, and a rubber head is arranged at the other end of each mounting seat; the reset spring is installed on the inner wall of the sealing plate, a guide plate is arranged at one end of the reset spring, a telescopic sealing block is installed on the outer wall of the guide plate, and one end of the telescopic sealing block penetrates through and extends out of the rubber head; the gear protection cover is mounted on the outer wall of one side of the detection bin; and the circulation cavity is arranged in the detection bin.

Description

Technical Field

[0001] The utility model relates to the technical field of flow sensors, in particular to a precision flow sensor. Background Technique

[0002] Root oval gear flow meters are mainly used for measuring the flow of large-diameter gas, liquid, and steam medium fluids in industrial pipelines in various industries.

[0003] For existing root oval gear flow meters, such as a gas root oval gear flow meter with the publication number CN208155381U, belonging to the field of flow meters, it includes a housing, a first root oval gear and a second root oval gear. The first root oval gear and the second root oval gear are arranged in the housing in a matching manner. A first gear is coaxially arranged with the first root oval gear, and a second gear is coaxially arranged with the second root oval gear. The first gear and the second gear are meshed. A third root oval gear is also coaxially arranged with the first root oval gear, and the axis of the third root oval gear is set at 45 degrees to the axis of the first root oval gear. A fourth root oval gear is also coaxially arranged with the second root oval gear, and the axis of the fourth root oval gear is set at 45 degrees to the axis of the second root oval gear. The third root oval gear and the fourth root oval gear are both arranged in the housing and are arranged in a matching manner.

[0004] When the root oval gears of the above flow sensor rotate, there will be a certain gap between the root oval gears and between the root oval gears and the housing when they are parallel. At this time, the lower the fluid viscosity, the higher the leakage amount flowing out from the gap, which is likely to affect the detection accuracy of the flow sensor. Therefore, we propose a precision flow sensor to solve the problems raised above. Content of the Utility Model

[0005] The purpose of the utility model is to provide a precision flow sensor to solve the problem that when the root oval gears of the existing flow sensor rotate, there will be a certain gap between the root oval gears and between the root oval gears and the housing when they are parallel. At this time, the lower the fluid viscosity, the higher the leakage amount flowing out from the gap, which is likely to affect the detection accuracy of the flow sensor as mentioned in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A precision flow sensor includes a detection chamber, an inlet flange is installed at the rear end of the detection chamber, and an outlet flange is installed at the front end of the detection chamber;

[0007] It is characterized in that: it further includes:

[0008] A mounting seat, which is arranged at the upper and lower ends of the inlet flange and the outlet flange, and the mounting seat is fixedly connected to the detection chamber. A sealing plate is installed at one end of the mounting seat, and a rubber head is arranged at the other end of the mounting seat;

[0009] A return spring is mounted on the inner wall of the sealing plate, a guide plate is provided at one end of the return spring, a telescopic sealing block is installed on the outer wall of the guide plate, and one end of the telescopic sealing block penetrates and extends to the outside of the rubber head;

[0010] A gear protection cover, which is installed on the outer wall of one side of the detection chamber;

[0011] A circulation chamber is arranged inside the detection chamber, and a waist wheel is installed inside the circulation chamber. Two waist wheels are provided, and the two waist wheels are distributed up and down. A connecting shaft is provided inside the waist wheel, and one end of the connecting shaft is rotatably connected to the detection chamber. Volume chambers are provided above and below the circulation chamber, and the volume chambers are communicated with the circulation chamber.

[0012] Preferably, the other ends of the connecting shafts of the two waist wheels pass through and extend to the interior of the gear protection cover, and are installed with gears. The adjacent gears are meshingly connected to each other, and a gear shaft is installed on the outer wall of one side of the gear. The gear shaft passes through and extends to the outside of the gear protection cover, and is installed with a magnetoelectric torque sensor.

[0013] Preferably, rubber pads are provided on the outer walls of the waist grooves on both sides of the waist wheel, and a polytetrafluoroethylene coating is provided on the outer walls of the rubber pads (13).

[0014] Preferably, an inspection cover is installed at the front end of the gear protection cover, and the edge of the inspection cover is threadedly connected to the gear protection cover by screws.

[0015] Preferably, the four corners of the sealing plate are threadedly connected to the mounting seat via screws.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The utility model arranges mounting seats on both sides above and below the detection chamber, and a telescopic sealing block fixed by a reset spring is arranged in the mounting seat. When the waist wheel rotates to a horizontal position, the two ends of the waist wheel cooperate with the telescopic sealing blocks extending from the mounting seats on both sides of the detection chamber to encapsulate a certain volume of medium into the volume cavity above the flow cavity, and cooperate with the elastic effect of the reset spring to make the telescopic sealing block tightly fit on the two ends of the waist wheel to reduce the packaging gap, and will not cause interference when the waist wheel continues to rotate, thereby improving the detection accuracy and solving the problem that when the waist wheel of the flow sensor rotates and there is a certain gap between the waist wheel and the shell when the waist wheel is parallel, at this time, the lower the viscosity of the fluid, the higher the leakage out of the gap, which is easy to affect the detection accuracy of the flow sensor.

[0018] By setting rubber pads on the outer walls of the waist slots on both sides of the lobed impellers, and a polytetrafluoroethylene coating is provided on the outer walls of the rubber pads. When one lobed impeller is horizontal and the other is vertical, the head of one lobed impeller will engage with the waist slot of the other lobed impeller. The rubber pads can, by virtue of their elastic action, make the head of the lobed impeller fit more closely with the waist slot, reducing the gap between the two, further improving the detection accuracy. And the polytetrafluoroethylene coating on the surface of the rubber pads is a non-stick coating, making the surface of the rubber pads smooth and preventing blockage when the lobed impellers come into contact and rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0020] Figure 2 is a schematic diagram of the internal structure of the detection chamber of the present utility model;

[0021] Figure 3 is a schematic diagram of the internal structure of the gear protection cover of the present utility model;

[0022] Figure 4 is an enlarged schematic diagram of the structure at A of the present utility model;

[0023] In the figures: 1, detection chamber; 2, inlet flange; 3, outlet flange; 4, mounting seat; 5, sealing plate; 6, gear protection cover; 7, inspection cover; 8, magneto-electric torque sensor; 9, flow-through cavity; 10, volume cavity; 11, lobed impeller; 12, connecting shaft; 13, rubber pad; 14, gear; 15, rubber head; 16, telescopic sealing block; 17, guide plate; 18, return spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0025] Please refer to Figures 1-4 , an embodiment provided by the present utility model: a precision flow sensor, including a detection chamber 1, an inlet flange 2 is installed at the rear end of the detection chamber 1, and an outlet flange 3 is installed at the front end of the detection chamber 1;

[0026] It further includes:

[0027] A mounting seat 4, which is arranged at the upper and lower ends of the inlet flange 2 and the outlet flange 3, and the mounting seat 4 is fixedly connected to the detection chamber 1. One end of the mounting seat 4 is installed with a sealing plate 5, and the other end of the mounting seat 4 is provided with a rubber head 15;

[0028] A return spring 18 is mounted on the inner wall of the sealing plate 5, a guide plate 17 is provided at one end of the return spring 18, a telescopic sealing block 16 is installed on the outer wall of the guide plate 17, and one end of the telescopic sealing block 16 penetrates and extends to the outside of the rubber head 15;

[0029] A gear protection cover 6 is mounted on an outer wall of one side of the detection chamber 1;

[0030] The circulation chamber 9 is arranged inside the detection chamber 1. A waist wheel 11 is installed inside the circulation chamber 9. Two waist wheels 11 are provided, and the two waist wheels 11 are distributed up and down. A connecting shaft 12 is provided inside the waist wheel 11, and one end of the connecting shaft 12 is rotatably connected to the detection chamber 1. Volume chambers 10 are provided above and below the circulation chamber 9, and the volume chamber 10 is communicated with the circulation chamber 9.

[0031] See also Figures 1-3 The other ends of the connecting shafts 12 of the two waist wheels 11 penetrate and extend to the interior of the gear protection cover 6, and are installed with gears 14. The adjacent gears 14 are meshingly connected. A gear shaft is installed on the outer wall of one side of the gear 14. The gear shaft penetrates and extends to the outside of the gear protection cover 6, and is installed with a magnetoelectric torque sensor 8.

[0032] See also Figure 2 Rubber pads 13 are provided on the outer walls of the waist grooves on both sides of the waist wheel 11, and a polytetrafluoroethylene coating is provided on the outer walls of the rubber pads 13. When one waist wheel 11 is horizontal and the other waist wheel 11 is vertical, the head of one waist wheel 11 will be engaged in the waist groove of the other waist wheel 11. The setting of the rubber pads 13 can rely on elasticity to make the head of the waist wheel 11 fit more closely with the waist groove, reduce the gap between the two, and improve the detection accuracy.

[0033] See also Figure 1 and Figure 4 An inspection cover 7 is installed at the front end of the gear protection cover 6. The edge of the inspection cover 7 is threadedly connected to the gear protection cover 6 by screws, and the four corners of the sealing plate 5 are threadedly connected to the mounting seat 4 by screws. The inspection cover 7 and the sealing plate 5 are both detachable structures for easy inspection and maintenance.

[0034] Working principle: During use, the inlet flange 2 and the outlet flange 3 at the front and rear ends of the detection chamber 1 are used to connect it to the medium flow channel. After that, the medium is fed into the detection chamber 1 from the flow channel. When the medium passes through the lobed wheel 11, due to the interception effect of the lobed wheel 11, the pressure on the water inlet side of the lobed wheel 11 in the upper position is greater than that on the water outlet side, so it rotates clockwise and transmits to the gear 14 on the connecting shaft 12. By the meshing of the two groups of gears 14, the two lobed wheels 11 are driven to rotate synchronously. When the lobed wheel 11 rotates to the horizontal position, the two ends of the lobed wheel 11 cooperate with the telescopic sealing blocks 16 extending from the mounting seats 4 on both sides of the detection chamber 1 to encapsulate a certain volume of the medium into the volume chamber 10 above the flow chamber 9. As the lobed wheel 11 rotates, the fluid is gradually discharged towards the outlet flange 3. Since the telescopic sealing block 16 is fixed by the return spring 18, it not only avoids the occurrence of gaps when the lobed wheel 11 encapsulates the fluid, but also does not prevent the lobed wheel 11 from rotating to discharge the medium in the volume chamber 10. When the upper lobed wheel 11 rotates to the vertical position, the lower lobed wheel 11 rotates to the horizontal position under the meshing drive of the gear 14, and a certain amount of the medium is encapsulated into the volume chamber 10 by the lower part, and it is also discharged along the outlet flange 3 as the lobed wheel 11 rotates. In this way, by repeating this process, based on the number of rotations of the lobed wheel 11, the discharge amount of the fluid can be judged. The number of rotations of the lobed wheel 11 is measured by the magnetoelectric torque sensor 8 located on the gear shaft and further fed back to the terminal to calculate the medium flow rate.

[0035] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A precision flow sensor, comprising a detection chamber (1), wherein an inlet flange (2) is installed at the rear end of the detection chamber (1), and an outlet flange (3) is installed at the front end of the detection chamber (1); Features: Also includes: A mounting seat (4) disposed at the upper and lower ends of the inlet flange (2) and the outlet flange (3), and the mounting seat (4) is fixedly connected to the detection chamber (1), a sealing plate (5) is installed at one end of the mounting seat (4), and a rubber head (15) is provided at the other end of the mounting seat (4); a return spring (18) mounted on the inner wall of the sealing plate (5); a guide plate (17) is provided at one end of the return spring (18); a telescopic sealing block (16) is mounted on the outer wall of the guide plate (17); and one end of the telescopic sealing block (16) penetrates and extends to the outside of the rubber head (15); A gear protection cover (6) mounted on an outer wall of one side of the detection chamber (1); A circulation chamber (9) is arranged inside the detection chamber (1), a waist wheel (11) is installed inside the circulation chamber (9), two waist wheels (11) are provided, and the two waist wheels (11) are distributed up and down, a connecting shaft (12) is provided inside the waist wheel (11), and one end of the connecting shaft (12) is rotatably connected to the detection chamber (1), and a volume chamber (10) is provided above and below the circulation chamber (9), and the volume chamber (10) is connected to the circulation chamber (9).

2. A precision flow sensor according to claim 1, characterized in that: The other ends of the connecting shafts (12) of the two waist wheels (11) penetrate and extend to the inside of the gear protection cover (6) and are installed with gears (14). Adjacent gears (14) are meshingly connected to each other. A gear shaft is installed on the outer wall of one side of the gear (14). The gear shaft penetrates and extends to the outside of the gear protection cover (6) and is installed with a magnetoelectric torque sensor (8).

3. A precision flow sensor according to claim 1, characterized in that: Rubber pads (13) are provided on the outer walls of the waist grooves on both sides of the waist wheel (11), and a polytetrafluoroethylene coating is provided on the outer walls of the rubber pads (13).

4. A precision flow sensor according to claim 1, characterized in that: An inspection cover (7) is installed at the front end of the gear protection cover (6), and the edge of the inspection cover (7) is threadedly connected to the gear protection cover (6) via screws.

5. A precision flow sensor according to claim 1, characterized in that: The four corners of the sealing plate (5) are threadedly connected to the mounting seat (4) via screws.

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