Turbine flowmeter

Abstract

The utility model discloses a turbine flowmeter which comprises a front support, a shaft sleeve, a shaft, a meter head, a magnetoelectric proximity sensor, an impeller, a bearing, a rear support, a shell and an alloy sheet. Wherein the front support and the rear support are fixed in the shell in a spaced mode, the two alloy sheets are fixed in the front support and the rear support in an extruded mode through the shaft sleeves, grooves are formed in the centers of the alloy sheets, the two ends of the shaft are conical and are in clearance fit with the shaft sleeves respectively, and the conical tip ends are inserted into the grooves of the alloy sheets in a matched mode. The bearing is fixed to the shaft, the impeller is installed on the bearing in an interference mode, the magnetoelectric proximity sensor is arranged in the meter rod, the meter rod is inserted into the shell and corresponds to the impeller in position, the magnetoelectric proximity sensor is used for sensing electric pulse signals when the impeller rotates and cuts magnetic lines of force, and the meter head is used for displaying the fluid flow corresponding to the electric pulse signals. The turbine flowmeter is simple in structure, reduces friction resistance between parts, and improves measurement accuracy.

Description

Technical Field

[0001] The utility model relates to the field of turbine flowmeters, and particularly provides a turbine flowmeter. Background Art

[0002] In the existing turbine flowmeter, the impeller and the shaft are connected through a bearing, and the impeller is fixed to the outer ring of the bearing. The inner ring of the bearing is in clearance fit with the shaft. Due to the self-weights of the impeller and the bearing, the inner ring of the bearing is in surface contact with the shaft, and the frictional force between the inner ring of the bearing and the shaft is relatively large. When measuring the flow rate of the medium, the impeller rotates under the thrust of the medium. However, when the medium flow rate is small, the thrust of the medium on the impeller is small, which may cause the impeller to rotate stuck, affecting the measurement accuracy.

[0003] Therefore, how to improve the structure of the existing turbine flowmeter to improve the measurement accuracy of small-flow media has become an urgent problem to be solved. Summary of the Utility Model

[0004] In view of this, the purpose of the utility model is to provide a turbine flowmeter to solve the problem of low measurement accuracy of the existing turbine flowmeter when measuring small-flow media.

[0005] The technical solution provided by the utility model is: a turbine flowmeter, including: a front bracket, a shaft sleeve, a shaft, a meter head, a magnetoelectric proximity sensor, an impeller, a bearing, a rear bracket, a housing and an alloy sheet; wherein, the front bracket and the rear bracket are fixedly spaced inside the housing, the alloy sheets are two and are respectively fixed inside the front bracket and the rear bracket by extrusion of the shaft sleeve, a groove is provided at the center position of the alloy sheet, both ends of the shaft are conical, both ends of the shaft are in clearance fit with the shaft sleeve respectively and the conical tips are inserted into the grooves of the alloy sheet in a matching manner, the bearing is fixed on the shaft, the impeller is installed on the bearing with an interference fit, the magnetoelectric proximity sensor is arranged in the meter rod, the meter rod is inserted into the housing and corresponds to the position of the impeller, and the magnetoelectric proximity sensor is used for inducing an electrical pulse signal when the impeller rotates and cuts the magnetic force line, and the meter head is used for displaying the fluid flow rate corresponding to the electrical pulse signal.

[0006] Preferably, the bearing is installed on the shaft with an interference fit.

[0007] More preferably, the shaft sleeve is an alloy shaft sleeve, and the bearing is a titanium steel bearing.

[0008] More preferably, the thickness of the blades in the impeller is 0.5 mm.

[0009] The turbine flowmeter provided by the present utility model has an impeller press-fitted on a bearing, and the bearing is press-fitted on a shaft. At the same time, both ends of the shaft are designed to be conical and are in mating contact with alloy sheets to form point contact. Compared with the prior art, the frictional resistance of the clearance fit between the shaft and the bearing is small, and the impeller rotates more flexibly.

[0010] The turbine flowmeter provided by the present utility model has a simple structure, reduces the frictional resistance between components, and improves the measurement accuracy of small-flow media. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present utility model will be further described in detail below with reference to the drawings and embodiments:

[0012] Figure 1 is a schematic structural diagram of the turbine flowmeter provided by the present utility model;

[0013] Figure 2 is a schematic connection diagram of the shaft, alloy sheet and shaft sleeve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] The present utility model will be further explained below in conjunction with specific implementation schemes, but the present utility model is not limited thereto.

[0015] As Figures 1 to 2 shown, the present utility model provides a turbine flowmeter, including: a front bracket 1, a shaft sleeve 2, a shaft 3, a meter head 4, a magnetoelectric proximity sensor 5, an impeller 6, a bearing 7, a rear bracket 8, a housing 9 and an alloy sheet 10. Among them, the front bracket 1 and the rear bracket 8 are fixedly spaced inside the housing 9. There are two alloy sheets 10, which are respectively press-fixed inside the front bracket 1 and the rear bracket 8 through the shaft sleeve 2. A groove is provided at the center position of the alloy sheet 10. Both ends of the shaft 3 are conical. Both ends of the shaft 3 are in clearance fit with the shaft sleeve 2, and the conical tips are inserted into the grooves of the alloy sheet 10. The bearing 7 is fixed on the shaft 3, the impeller 6 is press-fitted on the bearing 7, the magnetoelectric proximity sensor 5 is arranged in the meter rod, the meter rod is inserted into the housing 9 and corresponds to the position of the impeller 6. The magnetoelectric proximity sensor 5 is used to induce an electrical pulse signal when the impeller 6 rotates and cuts the magnetic force line, and the meter head 4 is used to display the fluid flow corresponding to the electrical pulse signal.

[0016] The working principle of the turbine flowmeter is as follows: When the medium flows into the interior of the housing, the fluid drives the impeller to rotate. When the impeller rotates, the blades on the impeller cut the magnetic force line to induce an electrical pulse signal. The magnetoelectric proximity sensor receives the change of the electrical pulse signal and can calculate the rotation speed of the impeller after amplification through the circuit, so that the flow rate of the medium can be calculated.

[0017] As an improvement of the technical solution, the bearing 7 is press-fitted on the shaft 3.

[0018] As an improvement of the technical solution, the bushing 2 is an alloy bushing, and the bearing 7 is a titanium steel bearing.

[0019] As an improvement of the technical solution, the bushing 2 is an alloy bushing, and the thickness of the blades in the impeller 6 is 0.5 mm.

[0020] The specific embodiments of the present invention are written in a progressive manner, emphasizing the differences between each embodiment, and the similar parts can be referred to each other.

[0021] The above has described in detail the embodiments of the present invention with reference to the drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge scope of those of ordinary skill in the art.

Claims

1. A turbine flowmeter, characterized in that: include: A front bracket (1), a sleeve (2), a shaft (3), a meter head (4), a magnetoelectric proximity sensor (5), an impeller (6), a bearing (7), a rear bracket (8), a housing (9) and an alloy sheet (10), wherein the front bracket (1) and the rear bracket (8) are fixed inside the housing (9) at intervals, the alloy sheet (10) is two and is respectively fixed inside the front bracket (1) and the rear bracket (8) by being pressed through the sleeve (2), a groove is provided at the center of the alloy sheet (10), the two ends of the shaft (3) are tapered, and the two ends of the shaft (3) are The ends are respectively clearance-matched with the shaft sleeve (2) and the conical tip is inserted into the groove of the alloy sheet (10), the bearing (7) is fixed on the shaft (3), the impeller (6) is interference-mounted on the bearing (7), the magnetoelectric proximity sensor (5) is arranged in the meter rod, the meter rod is inserted into the housing (9) and corresponds to the position of the impeller (6), the magnetoelectric proximity sensor (5) is used to sense an electric pulse signal when the impeller (6) rotates and cuts the magnetic lines of force, and the meter head (4) is used to display the fluid flow corresponding to the electric pulse signal.

2. The turbine flowmeter according to claim 1, characterized in that: The bearing (7) is interference-mounted on the shaft (3).

3. The turbine flowmeter according to claim 1, characterized in that: The shaft sleeve (2) is an alloy shaft sleeve, and the bearing (7) is a titanium steel bearing.

4. The turbine flowmeter according to claim 1, characterized in that: The thickness of the blades in the impeller (6) is 0.5 mm.

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