Turbo type flow meter

Abstract

The utility model discloses a turbo type flowmeter which comprises a straight pipe, a Hall sensor and an impeller, the impeller is rotatably installed in the straight pipe, the Hall sensor is fixed on the pipe wall, close to the impeller, of the straight pipe, a sensing head of the Hall sensor is aligned with the impeller, a drainage pipe is coaxially and fixedly installed in the straight pipe, and the drainage pipe is fixed on the pipe wall of the straight pipe. One end of the drainage pipe extends to the position close to the end of the straight pipe, the other end of the drainage pipe is coaxially and fixedly provided with an impeller cylinder base with the same diameter as the drainage pipe, the impeller is rotatably installed in the impeller cylinder base, and a fluid channel for water flow to pass through is reserved between the drainage pipe and the straight pipe. According to the turbo type flowmeter, the drainage pipe is coaxially installed in the straight pipe, on one hand, detection of water flow with small flow can be achieved, and on the other hand, the transportation efficiency of the whole pipeline can be guaranteed.

Description

Technical Field

[0001] The utility model relates to a flowmeter, and more particularly to a turbine flowmeter. Background Art

[0002] At present, the existing turbine flowmeters basically consist of a straight pipeline, in which a rotatable turbine is arranged. Then, a Hall sensor is arranged on the pipeline wall close to the turbine. In this way, the turbine is rotated by the impact of the fluid, and then the magnet on the turbine also rotates. Furthermore, the magnetic field signal after each rotation is detected by the Hall sensor, and thus the rotation speed of the turbine is obtained. Finally, the flow rate is calculated through the rotation speed. However, in the above structure, the turbine must rotate during the detection process. And if the turbine wants to rotate, it requires a certain amount of fluid impact. Therefore, the turbine flowmeter has the problem of a relatively high required flow rate for starting detection.

[0003] For this reason, in the prior art, there is an invention patent with the patent number 201510405743.1 and the name of a turbine flowmeter, which discloses that by coaxially arranging a flow guide cylinder in the pipeline, the flow passage of the turbine can be narrowed, so as to achieve the effect of driving the turbine to rotate with a smaller flow rate, and thus avoid the problem of a relatively high required flow rate for starting detection existing in the prior art. However, generally, when a flowmeter is in use, it is directly connected to the pipeline and directly participates in the transportation of the fluid. Therefore, the flowmeter with the above structure will greatly reduce the diameter of the fluid transportation pipeline, and thus greatly affect the transportation efficiency of the entire pipeline. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the purpose of the present utility model is to provide a turbine flowmeter with less impact on the transportation efficiency of the overall pipeline.

[0005] To achieve the above purpose, the present utility model provides the following technical solution: A turbine flowmeter, including a straight pipe, a Hall sensor, and an impeller. The impeller is rotatably installed in the straight pipe. The Hall sensor is fixed on the pipe wall of the straight pipe close to the impeller, and the sensing head of the Hall sensor is aligned with the impeller. Its characteristics are that: A flow guide pipe is coaxially and fixedly installed in the straight pipe. One end of the flow guide pipe extends to a position close to the end of the straight pipe, and the other end is coaxially fixed with an impeller cylinder seat with the same diameter. The impeller is rotatably installed in the impeller cylinder seat. A fluid passage for the fluid to pass through is left between the flow guide pipe and the straight pipe.

[0006] As a further improvement of the present utility model, connecting ribs are circumferentially fixed on the outer side wall of the flow guide pipe. The side of the connecting rib is fixed to the inner side wall of the straight pipe to coaxially fix the flow guide pipe in the straight pipe. The side of the connecting rib is tangent to the outer side wall of the flow guide pipe.

[0007] As a further improvement of the present utility model, an acceleration ring is coaxially fixed on the inner side wall of the straight pipe near the end of the drainage pipe facing away from the impeller cylinder seat. The cross section of the acceleration ring is in the shape of a right triangle. One right-angled side of the right triangle is attached to the inner side wall of the straight pipe, so that the acceleration ring forms a pipe structure with a small inlet and a large outlet inside the straight pipe through the hypotenuse. The other right-angled side of the acceleration ring forms the end face of the acceleration ring, and a sealing ring groove for accommodating a sealing ring is provided on this end face. A thread for connecting an external pipe is provided on the inner side wall of the straight pipe at the position between the end and the sealing ring groove.

[0008] The beneficial effects of the present utility model are as follows: By setting the straight pipe, Hall sensor and impeller, a turbine flowmeter can be simply and effectively formed. By arranging a drainage pipe in the straight pipe, fixing an impeller cylinder seat at the end of the drainage pipe, and then rotatably installing the impeller in the impeller cylinder seat, on the one hand, the role of the drainage pipe can be utilized to reduce the initial fluid flow rate for driving the impeller to rotate, and on the other hand, the fluid channel formed between the drainage pipe and the straight pipe can make the flow rate loss that the straight pipe can achieve smaller. Therefore, compared with the existing technology, the detection of small flow rates can be realized, and at the same time, the influence on the transportation efficiency of the overall pipeline is smaller. Description of the Drawings

[0009] Figure 1 It is a schematic diagram of the internal structure of the turbine flowmeter of the present utility model;

[0010] Figure 2 It is a schematic diagram of the end structure of the turbine flowmeter of the present utility model. Detailed Embodiments

[0011] The following will further elaborate on the present utility model in combination with the embodiments given in the drawings.

[0012] Refer to Figures 1 to 2As shown in the figure, a turbine flowmeter according to this embodiment includes a straight pipe 1, a Hall sensor 2, and an impeller 3. The impeller 3 is rotatably installed in the straight pipe 1. The Hall sensor 2 is fixed on the pipe wall of the straight pipe 1 close to the impeller 3, and the sensing head of the Hall sensor 2 is aligned with the impeller 3. It is characterized in that: a diversion pipe 4 is coaxially and fixedly installed in the straight pipe 1. One end of the diversion pipe 4 extends to a position close to the end of the straight pipe 1, and the other end is coaxially fixed with an impeller cylinder seat 5 with the same diameter. The impeller 3 is rotatably installed in the impeller cylinder seat 5. A fluid passage for the fluid to pass through is left between the diversion pipe 4 and the straight pipe 1. During the process of using the flowmeter structure of this embodiment, only the straight pipe 1 needs to be connected to the external pipeline. Then, the fluid in the external pipeline will flow through the straight pipe 1. During the process of the fluid passing through the straight pipe 1, as long as it is ensured that the fluid can fill the inside of the diversion pipe 4, the impeller 3 can be driven to rotate. In this way, the detection of a smaller flow rate is realized. And with the setting of the fluid passage, when a large flow rate needs to pass through, the fluid can be assisted to pass through through the fluid passage, effectively ensuring the transportation efficiency of the pipeline and minimizing the loss of the pipeline transportation efficiency. Among them, the magnet used for the Hall sensor 2 in this embodiment can be several magnets 9 (preferably two) installed on the outer circumference of the blades of the impeller 3, or a magnetic ring 10 installed on the inner shaft of the impeller 3. The magnetic ring 10 rotates as the impeller 3 rotates.

[0013] As a specific improvement embodiment, connecting ribs 6 are fixedly arranged in a circle on the outer side wall of the diversion pipe 4. The side of the connecting rib 6 is fixed to the inner side wall of the straight pipe 1 to coaxially fix the diversion pipe 4 in the straight pipe 1. The side of the connecting rib 6 is tangent to the outer side wall of the diversion pipe 4. Through the setting of the connecting rib 6, the diversion pipe 4 can be simply and effectively coaxially fixed in the straight pipe 1. Further, by making the side of the connecting rib 6 tangent to the outer side wall of the diversion pipe 4, the connecting rib 6 is inclined in the fluid passage, which can maximize the connection surface between the connecting rib 6 and the outer side wall of the diversion pipe 4 and between the connecting rib 6 and the inner side wall of the straight pipe 1, increase the firmness of the overall structure, and at the same time minimize the occupation of the fluid passage.

[0014] As a specific implementation of the improvement, an acceleration ring 7 is coaxially fixed on the inner side wall of the straight pipe 1 near the end of the drainage pipe 4 facing away from the impeller cylinder seat 5. The cross-section of the acceleration ring 7 is a right triangle, and one right-angled side of the right triangle is attached to the inner side wall of the straight pipe 1, so that the acceleration ring 7 forms a pipe structure with a small inlet and a large outlet inside the straight pipe 1 through the hypotenuse. The other right-angled side of the acceleration ring 7 forms the end face of the acceleration ring 7, and a sealing ring groove 8 for accommodating the sealing ring is provided on this end face. Threads for connecting external pipes are provided on the inner side wall of the straight pipe 1 at the position between the end and the sealing ring groove 8. Through the setting of the acceleration ring 7, the flow velocity of the fluid flowing into the drainage pipe 4 can be realized, and then the impeller 3 can be better driven to rotate, so that the flowmeter can detect a smaller flow rate. And through the setting of the sealing ring groove 8, a accommodating space can be effectively provided for the sealing ring, ensuring the sealing performance between the straight pipe 1 and the external pipe connection, so that the fluid can better enter the drainage pipe 4.

[0015] In summary, for the turbine flowmeter of this embodiment, with the setting of the drainage pipe 4, on the one hand, the flowmeter can detect a smaller flow rate, and on the other hand, the loss of the transportation efficiency of the overall pipeline can be reduced.

[0016] The above are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A turbine flow meter, comprising a straight tube (1), a Hall sensor (2) and an impeller (3), wherein the impeller (3) is rotatably mounted in the straight tube (1), the Hall sensor (2) is fixed on the tube wall of the straight tube (1) close to the impeller (3), and the induction head of the Hall sensor (2) is aligned with the impeller (3), characterized in that: A drainage tube (4) is coaxially fixedly installed in the straight tube (1), one end of the drainage tube (4) extends to a position close to the end of the straight tube (1), and the other end is coaxially fixed with an impeller cartridge seat (5) having the same diameter as the straight tube (1), the impeller (3) is rotatably installed in the impeller cartridge seat (5), and a fluid channel for water flow to pass through is reserved between the drainage tube (4) and the straight tube (1).

2. The turbine flow meter according to claim 1, characterized in that: A connecting rib (6) is fixed in a circumferential manner on the outer wall of the drainage tube (4); the side edge of the connecting rib (6) is fixed to the inner wall of the straight tube (1) so as to coaxially fix the drainage tube (4) in the straight tube (1); and the side edge of the connecting rib (6) is tangent to the outer wall of the drainage tube (4).

3. The turbine flow meter according to claim 2, characterized in that: An acceleration ring (7) is coaxially fixed on the inner wall of the straight tube (1) at a position close to the end of the drainage tube (4) facing away from the impeller cylinder seat (5); the cross section of the acceleration ring (7) is a right triangle, and the right angle side of one side of the right triangle fits with the inner wall of the straight tube (1), so that the acceleration ring (7) forms a pipeline structure with a small inlet and a large outlet inside the straight tube (1) through the hypotenuse; the right angle side of the other side of the acceleration ring (7) forms the end face of the acceleration ring (7), and a sealing ring groove (8) for accommodating a sealing ring is provided on the end face; and a thread for connecting to an external pipeline is provided on the inner wall of the straight tube (1) at a position between the end and the sealing ring groove (8).

Images