Built-in electromagnetic flow sensor
By designing the insulating inner part and the shell as one, using injection molding method and hot melt welding interface, the existing electromagnetic flow sensors have been solved, and the efficient and low-cost electromagnetic flow sensor production has been achieved, which has improved the Measurement accuracy and sensitivity.
Patent Information
- Application Number
- CN202411437794.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-01-10
AI Technical Summary
The existing electromagnetic flow sensors are manufactured separately because the insulated lining and shell are poor in integration, many parts, and high material and labor costs, which limit large-scale industrial production.
The plastic material is used as the insulating inner part and the shell to be designed in one go, and is manufactured by injection molding method at one time, combining the hot melt welding interface and the excitation coil installed inside the pressure bearing tube to form an internal electromagnetic flow sensor.
It has achieved good integrity, few parts, low material and labor costs, excellent performance, good sensor sensitivity and measurement accuracy, and is suitable for large-scale industrial production.
Smart Images
Figure CN119290091A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to an electromagnetic flowmeter sensor, and in particular to a shell, an inner lining and a hot-melt welding joint portion of the electromagnetic flowmeter. The present invention is applicable to the field of flow measurement based on the electromagnetic measurement principle, and is particularly applicable to heat meters, cold meters, water meters, sewage meters, etc. based on the electromagnetic measurement principle, and is also applicable to rapid filling and flow ratio systems. Background Art
[0002] Electromagnetic flowmeter is a flow measurement instrument based on Faraday's electromagnetic induction principle. Its basic principle is that when a fluid passes through a magnetic field, an induced electromotive force is generated. The magnitude of the induced electromotive force is proportional to the flow rate of the fluid. The flow rate of the fluid is obtained by measuring the induced electromotive force. Usually, an electromagnetic flowmeter consists of a sensor and a transmitter.
[0003] The sensor is mainly composed of a measuring tube, an excitation coil, a detection electrode, and a housing that meets the protection standards. The measuring tube of the existing sensor is composed of a metal pipe or a non-metallic pipe, and the connection between the measuring tube composed of a metal pipe and the housing is welded or clamped. These connection methods have poor integrity in the manufacture of electromagnetic flow sensors, many parts, and high material and labor costs.
[0004] The measuring tube of the sensor is composed of a metal tube and an insulating lining. Since the insulating lining is manufactured by a separate process, the manufacturing cycle is long, and a magnetically conductive stainless steel tube is also required, which has a high manufacturing cost. The outer shell is composed of another method. The insulating lining and the outer shell are made of different materials. The excitation coil is installed outside the pressure pipe, and a magnetic yoke needs to be installed outside the excitation coil. Finally, the side panel and the outer ring need to be installed. When manufactured separately, the electromagnetic flow sensor has poor integrity, many parts, and high material and labor costs.
[0005] In summary, the existing electromagnetic flow sensor insulation lining and shell have the following problems: when a metal tube and an insulating lining are used, since the insulating lining and the instrument shell are manufactured separately, the electromagnetic flow sensor has poor integrity, many parts, and high material and labor costs; traditional electromagnetic flow sensors have many parts, many installation and manufacturing procedures, and high labor costs, which are not conducive to large-scale industrial production.
[0006] Therefore, it is necessary to design a built-in electromagnetic flow sensor. Summary of the invention
[0007] The technical problem to be solved by the present invention is that when the existing electromagnetic flow sensor is composed of a metal tube and an insulating lining, since the insulating lining and the instrument housing are manufactured separately, the electromagnetic flow sensor has poor integrity, many parts, and high material and labor costs; the traditional electromagnetic flow sensor has many parts, many installation and manufacturing procedures, and high labor costs, which is not conducive to large-scale industrial production.
[0008] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide a built-in electromagnetic flow sensor, which includes an outer shell, an end face sealing sheet, an insulating inner part, a hot melt welding joint and an excitation coil installed inside a pressure pipe, and the insulating inner part and the outer shell are designed as an integral whole.
[0009] The shell is made of iron.
[0010] The insulating inner part and the outer shell are made of plastic.
[0011] The insulating inner part is a one-time injection-molded product.
[0012] The beneficial effects of the present invention are as follows:
[0013] 1. The insulating lining and shell of the electromagnetic flowmeter sensor measuring tube are made of plastic material and are manufactured in one go by injection molding. They have good integrity, few parts, low material and labor costs, and are easy to mass-produce industrially.
[0014] 2. The sensors produced by injection molding method have excellent performance, good sensor sensitivity and measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic cross-sectional structure diagram of form 1 of the electromagnetic flowmeter of the present invention;
[0016] Figure 2 It is a schematic cross-sectional structure diagram of form 2 of the electromagnetic flowmeter of the present invention;
[0017] Figure 3 This is a schematic diagram of the welding port position of the first embodiment of the present invention;
[0018] Figure 4 Schematic diagram of the welding port position of form 2 of the present invention.
[0019] In the figure: 1. Shell; 2. End face sealing piece; 3. Insulating inner part; 4. Hot melt welding joint; 5. Excitation coil. DETAILED DESCRIPTION
[0020] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.
[0021] See also Figure 1-4 The electromagnetic flowmeter sensor comprises a housing 1, an end face sealing sheet 2, an insulating inner part 3, a hot melt welding joint 4, and an excitation coil 5 installed inside the pressure-bearing pipe; the housing 1 is made of metal material. The insulating inner part 3 is made of plastic in one go by injection molding.
[0022] The housing 1 is made of an iron metal material tube, which acts as a pressure-bearing tube in the pipeline and also acts as a yoke for the excitation coil. We name this method as a built-in electromagnetic flow sensor to distinguish it from the existing electromagnetic flow sensor in which the excitation coil 5 is installed outside the housing 1.
[0023] The hot melt welding joint 4 can also be other types of welding joints, see Figure 3 , Figure 4 .
[0024] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.
Claims
1. A built-in electromagnetic flow sensor, characterized in that: The electromagnetic flow sensor comprises a housing (1), an end face sealing sheet (2), an insulating inner part (3), a hot-melt welding joint (4), and an excitation coil (5).
2. The built-in electromagnetic flow sensor according to claim 1, characterized in that: The insulating inner part (3) is a one-step injection-molded product, the excitation coil (5) is mounted on the insulating inner part (3), and the excitation coil (5) is mounted in the housing (1).
3. The built-in electromagnetic flow sensor according to claim 1, characterized in that: The housing (1) is a pressure-bearing component.
4. The built-in electromagnetic flow sensor according to claim 3, characterized in that: The connection between the insulating inner part (3) and the end face sealing sheet (2) is carried out by hot-melt welding, and a hot-melt welding joint (4) is formed.