Turbine unit and gas turbine flowmeter

Abstract

The present invention discloses a turbine unit and a gas turbine flowmeter. The turbine unit includes a rectifier and an impeller assembly. The bearing seat in the impeller assembly is built into the rectifier, and the impeller in the impeller assembly is located outside the rectifier. Since the bearing seat is installed inside the rectifier, it is possible to directly determine whether the impeller has abnormal rotation through the gas outlet without disassembling the meter body parts. Even if the rotation is stuck and needs maintenance, the turbine unit can be disassembled as a whole in one step without the need for complicated disassembly procedures. The support cylinder used to fix the bearing seat in the original flowmeter is eliminated, thereby reducing the cost of the flowmeter. In addition, compared with the existing flowmeter, since the internal and external dimensions have not changed, it can be applied to all scenarios where the existing flowmeter is used. Moreover, the internal and external dimensions of the shell have not increased, so the previous shell mold can be used, thereby saving the cost of remaking the mold.

Description

Technical Field

[0001] The present invention relates to a flow meter, in particular to a turbine unit and a gas turbine flow meter. Background Art

[0002] Turbine flowmeters have long been the preferred choice for natural gas trade measurement. Mechanically, a front-end rectifier rectifies and compresses the gas, ensuring stable airflow, uniform flow field distribution, and improved metering performance. The rectified and optimized gas flow field acts smoothly on the impeller blades, generating rotational torque and overcoming various resistance torques to achieve balanced rotation. This allows the magnetic wheel to evenly cut through the magnetic field, transmitting the pulse signal to an integrator for amplification and conversion, thereby enabling monitoring and cumulative measurement of gas flow.

[0003] like Figure 1 As shown, the turbine unit of the turbine flowmeter currently in the industry consists of two parts: a rectifier 01 and an impeller assembly 02, and is arranged in sequence along the direction of airflow. After the gas enters the air inlet, it is first sorted and optimized by the rectifier 01, and then acts on the impeller assembly 02. The impeller 03 in the impeller assembly 02 drives the magnetic steel wheel 04 to rotate and transmit the signal to the sensor to realize gas measurement.

[0004] Because turbine flowmeters operate under complex and ever-changing gas source environments and operating conditions, regular maintenance is essential to ensure operational reliability and stability. In extreme environments or under high loads, the impeller can become stuck or become inflexible, directly impacting the accuracy of gas trade settlements. This necessitates prompt identification and removal of the impeller for repair.

[0005] However, once the existing gas turbine flowmeter needs to be repaired, the following problems will arise:

[0006] Since the structure of the impeller assembly 02 in the traditional turbine flowmeter is relatively complex, the impeller 03 is located between the bearing seat 05 and the rectifier 01. The bearing seat is fixed in the shell by a support tube and is located at the front end of the rectifier. Therefore, the impeller condition cannot be directly observed from the gas inlet or outlet. The impeller 03 is a key component in the gas turbine flowmeter. If the impeller is stuck or does not rotate flexibly, it will directly affect the metering accuracy. In complex working conditions, the matching relationship between the impeller and the shell is precise. Due to various extreme conditions, overload, and improper maintenance, the impeller will rotate abnormally. Therefore, regular maintenance is required. During maintenance, all parts need to be disassembled one by one for fault diagnosis and repair. This maintenance process is relatively complicated and time-consuming and labor-intensive. Summary of the Invention

[0007] In order to solve the problem of complicated parts disassembly during maintenance in existing gas turbine flowmeters, the present invention provides a turbine unit.

[0008] Also provided is a gas turbine flowmeter using the turbine unit.

[0009] The specific technical solutions of the present invention are as follows:

[0010] A turbine unit comprises a rectifier and an impeller assembly. The improvement thereof is that a bearing seat in the impeller assembly is built into the rectifier, and an impeller in the impeller assembly is located outside the rectifier.

[0011] Furthermore, the impeller assembly includes a bearing seat, an impeller, a central shaft and a magnetic steel;

[0012] The bearing seat is fixedly installed inside the rectifier;

[0013] The impeller is located outside the rectifier;

[0014] The central shaft is supported and installed on the bearing seat through two bearing assemblies. The rear end of the central shaft is located inside the rectifier. The middle of the central shaft is connected to the impeller. The front end of the central shaft is installed with the magnetic steel.

[0015] Furthermore, the impeller includes a main body and a plurality of blades arranged on the main body; the main body is in a frustum shape as a whole.

[0016] Furthermore, the above-mentioned rectifier has a double-layer structure, including an inner shell, an outer tube and guide vanes; a plurality of guide vanes are arranged between the inner shell and the outer tube, and a plurality of gas channels are formed between the plurality of guide vanes.

[0017] Furthermore, the outer dimensions of the impeller are smaller than the outer dimensions of the rectifier.

[0018] Furthermore, the impeller is fixedly mounted on the central shaft via pins.

[0019] The present invention also provides a gas turbine flowmeter, comprising a housing, a sensor and the above-mentioned turbine unit; the turbine unit is installed in the housing; the sensor is inserted into the housing and corresponds to the position of the magnetic steel.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. In the present invention, since the bearing seat is installed inside the rectifier and the impeller is outside, this open structural relationship can directly determine whether the impeller has abnormal rotation through the gas outlet without disassembling the meter body parts. Even if the rotation is stuck and needs maintenance, the turbine unit can be disassembled as a whole in one step without the need for complicated disassembly procedures.

[0022] 2. The turbine unit of the present invention embeds the bearing seat in the impeller assembly into the rectifier, which not only reduces the axial size of the turbine unit and compresses half of the space, but also eliminates the support cylinder used to fix the bearing seat in the original flow meter, thereby reducing the cost of the flow meter. In addition, compared with the existing flow meter, since the internal and external dimensions have not changed, it can be applied to all scenarios where the existing flow meter is used, and the internal and external dimensions of the shell have not increased, so the previous shell mold can be used, thereby saving the cost of remaking the mold.

[0023] 3. The main body of the flow meter of the present invention is in the shape of a cone, that is, the outer surface of the installation blade is an inclined surface, so it can effectively guide various impurities to other areas in the shell, reduce the probability of impeller jamming, and ensure the stability and reliability of the instrument operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the structure of an existing turbine unit.

[0025] Figure 1 The reference numerals are as follows:

[0026] 01-Rectifier, 02-Impeller assembly, 03-Impeller, 04-Magnetic steel wheel, 05-Bearing seat.

[0027] Figure 2 It is a structural diagram of the present invention.

[0028] Figure 3 This is the structural diagram of the gas turbine flowmeter.

[0029] Figure 2 and Figure 3 The reference numerals are as follows:

[0030] 1-rectifier, 11-inner cylinder, 12-outer cylinder, 13-gas channel, 14-guide vane;

[0031] 2-impeller assembly, 21-bearing seat, 22-impeller, 221-main body, 222-blade, 23-center shaft, 24-magnetic steel wheel;

[0032] A-Turbine unit, B-Casing, C-Sensor. DETAILED DESCRIPTION

[0033] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of the specific embodiments of the present invention is given in conjunction with the accompanying drawings. It is obvious that the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in this field without creative work should fall within the scope of protection of the present invention.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] At the same time, in the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "front, back, inside and outside" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] Unless otherwise specified or limited, the terms "mounted, connected, and connected" in this disclosure should be understood broadly. For example, they may refer to fixed, removable, or integral connections. They may also refer to mechanical, electrical, or direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure.

[0037] The impeller in the turbine unit is both a key core component and a vulnerable part. Under long-term complex gas source environments, the impeller faces interference from various working conditions. When a turbine unit fails, it is necessary to quickly determine the fault and quickly dismantle the turbine unit for maintenance.

[0038] Based on this, the present invention provides a turbine unit, such as Figure 2 As shown, the instrument comprises a rectifier 1 and an impeller assembly 2. The bearing housing of the impeller assembly 2 is built into the rectifier, while the impeller of the impeller assembly is located outside the rectifier. This open structure allows the impeller to be directly detected through the gas outlet without disassembling the instrument body. Even if the instrument is stuck and requires maintenance, the turbine unit can be disassembled in one step without complex disassembly procedures.

[0039] Specifically, in this embodiment, the rectifier 1 has a double-layer structure, including an inner tube 11, an outer tube 12, and a gas channel 13 provided between the inner tube 11 and the outer tube 12. A guide vane 14 is provided in the gas channel to achieve gas rectification.

[0040] The impeller assembly 2 includes a bearing seat 21, an impeller 22, a central shaft 23 and a magnet 24; the inner cylinder 11 and the outer cylinder 12 of the rectifier 1 are both open at one end, and the bearing seat 21 is fixedly installed inside the inner cylinder 11 by means of a flange connection; the impeller 22 is located outside the rectifier 1 (i.e., on the side of the open end); the central shaft 23 is coaxially supported and mounted on the bearing seat 11 by two bearings (such as Figure 2 As shown, the rear end of center shaft 23 is supported by bearing A, which is positioned by bearing pressure plate A and the rear end shoulder of center shaft 23. The middle portion of center shaft 23 is supported by bearing B, which is positioned by bearing pressure plate B and the upper end shoulder of center shaft 23. The rear end of center shaft 23 is located within inner cylinder 11, and the middle portion is connected to impeller 22. The front end of center shaft 23 is mounted with magnet 24. To facilitate disassembly, the outer dimensions of impeller 22 are smaller than those of the rectifier (i.e., smaller than those of outer cylinder 12), ensuring that the impeller assembly 2 and rectifier 1 can be directly removed together during maintenance.

[0041] In this embodiment, by integrating the impeller assembly 2 and the rectifier 1, the original structure is simplified, the assembly space is compressed by half, and the support cylinder for fixing the bearing seat in the original flow meter is eliminated, the number of parts is reduced, and the cost of the flow meter is reduced. In addition, compared with the existing flow meter, the internal and external dimensions of the flow meter have not changed, so it can be applied to all scenarios where the existing flow meter is used, and the internal and external dimensions of the shell 1 have not increased, so the previous shell mold can be used, thereby saving the cost of remaking the mold.

[0042] In this embodiment, the impeller 22 can be mounted on the central shaft 23 by pins, and the magnet 24 can be mounted on the front end of the central shaft 23 by welding.

[0043] In addition, in this embodiment, the main body 221 of the impeller 22 is generally in the shape of a cone, that is, the outer surface on which the blades 222 are installed is an inclined surface. When the gas passes through, impurity particles can slide down through the inclined surface and will not be brought into the gap between the impeller 22 and the inner wall of the shell B, thereby avoiding the occurrence of accumulation and jamming.

[0044] The turbine unit A of this embodiment is installed in the housing B, and the sensor C is inserted into the housing. The position of the sensor C corresponds to the position of the magnetic steel 24. Then other external components are installed to form a gas turbine flowmeter. Figure 3 shown.

[0045] Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments and application fields. The above-mentioned specific embodiments are merely illustrative and instructive, and are not restrictive. A person skilled in the art, guided by this specification and without departing from the scope of protection of the claims of the present invention, may also devise various forms, all of which fall within the scope of protection of the present invention.

Claims

1. A turbine unit comprising a rectifier and an impeller assembly, characterized in that: The bearing seat in the impeller assembly is built into the rectifier, and the impeller in the impeller assembly is located outside the rectifier. The impeller assembly includes a bearing seat, an impeller, a central shaft and a magnetic steel; The bearing seat is fixedly installed inside the rectifier; The impeller is located outside the rectifier; The central shaft is supported and installed on the bearing seat through two bearing assemblies. The rear end of the central shaft is located inside the rectifier. The middle of the central shaft is connected to the impeller. The front end of the central shaft is installed with the magnetic steel.

2. The turbine unit according to claim 1, characterized in that: The impeller comprises a main body and a plurality of blades arranged on the main body; the main body is in a frustum shape as a whole.

3. The turbine unit according to claim 2, characterized in that: The rectifier has a double-layer structure, including an inner liner, an outer tube and guide vanes; multiple guide vanes are arranged between the inner liner and the outer tube, and multiple gas channels are formed between the multiple guide vanes.

4. The turbine unit according to claim 3, characterized in that: The outer dimensions of the impeller are smaller than the outer dimensions of the rectifier.

5. The turbine unit according to claim 3, characterized in that: The impeller is fixedly mounted on the central shaft via pins.

6. A gas turbine flowmeter, characterized in that: It comprises a housing, a sensor and a turbine unit according to any one of claims 1 to 5; The turbine unit is installed in the shell; the sensor is inserted into the shell and corresponds to the position of the magnetic steel.

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