Dual insulation flowmeter

Abstract

The application provides a double-insulated flowmeter, which comprises a flowmeter shell, an impeller assembly arranged in the flowmeter shell, a sensor for collecting a rotating impeller signal, a PCB plate electrically connected with the sensor, a PCB insulation sleeve arranged below the flowmeter shell in sequence, and a base connected with the flowmeter shell in clamping fitting mode, wherein the base is connected with the flowmeter shell in clamping fitting mode, the PCB insulation sleeve is arranged in a cavity between the flowmeter shell and the base, the flowmeter shell is internally provided with a clamping cavity matched with the PCB insulation sleeve, the upper portion of the PCB insulation sleeve is inserted into the clamping cavity, a closed area is formed between the upper wall of the PCB insulation sleeve and the clamping cavity, the PCB insulation sleeve is internally provided with an inner cavity for mounting the sensor, and the PCB plate is arranged at the bottom of the PCB insulation sleeve. The flowmeter shell is once insulated and sealed, the PCB insulation sleeve is twice insulated and sealed, the double-insulated effect can be achieved, and the service life of the flowmeter is effectively prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flow meters, in particular to a double insulation flow meter. BACKGROUND

[0002] The flow meter mainly comprises a cylindrical flow meter shell, a impeller assembly, a inductor and a inductive element installed on the impeller assembly and matched with the inductor are arranged in the shell. The metering process of the flow meter is as follows: when the fluid enters the flow meter shell, the impeller blades of the impeller assembly arranged in the shell are rotated under the flow force of the fluid, the impeller blades trigger the inductive element at the same time, the inductive element outputs the impeller rotation frequency signal to the signal processing device arranged outside the flow meter shell, the signal is processed and displayed on the display device to achieve the purpose of metering. According to the chapter 22.33 of GB4706.1-2008, the conductive liquid which is easy to touch or may become easy to touch should not be in direct contact with the basic insulation or enhanced insulation for the II type structure in normal use. Because water is an easy-to-touch conductive liquid, the impeller of the existing flow meter only adopts the impeller shell for basic insulation, and the inductor circuit adopts an isolated power supply; when the flow meter power supply adopts a low-cost non-isolated power supply, the flow meter must meet the double insulation. The present application provides a double insulation flow meter. SUMMARY

[0003] The purpose of the present application is to solve the problems in the prior art, and to provide a double insulation flow meter which has the effect of double sealing insulation.

[0004] In order to achieve the above purpose, the present application provides a double insulation flow meter, which comprises a flow meter shell, an impeller assembly arranged in the flow meter shell, a sensor for collecting the rotating impeller signal, and a PCB board electrically connected with the sensor. A PCB insulation sleeve and a base are sequentially arranged below the flow meter shell. The base is connected with the flow meter shell in a clamping manner. The PCB insulation sleeve is installed in a cavity between the flow meter shell and the base. The flow meter shell has a clamping cavity matched with the PCB insulation sleeve. The upper part of the PCB insulation sleeve is inserted into the clamping cavity, and an enclosed area is formed between the upper wall of the PCB insulation sleeve and the clamping cavity. The PCB insulation sleeve has an inner cavity for installing the sensor. The PCB board is installed at the bottom of the PCB insulation sleeve.

[0005] As preferred, the flow meter housing is provided with an impeller chamber communicated with the water inlet and outlet channels of the flow meter, the impeller chamber is provided with an impeller assembly, the two sides of the impeller chamber are symmetrically provided with first mounting chambers, the first mounting chambers are internally provided with clamping cavities, the PCB insulation sleeve is provided with two upwardly extending sensor mounting chambers, the sensor mounting chambers are inserted into the clamping cavities, and a concave cavity adapted to the impeller chamber is formed between the two sensor mounting chambers.

[0006] As preferred, the two sides of the base are symmetrically provided with clamping plates matched with the flow meter housing, the inner walls of the clamping plates are provided with inwardly protruding clamping legs, the two sides of the flow meter housing are symmetrically provided with limiting stepped portions, the clamping plates are clamped with the limiting stepped portions, and the lower end faces of the clamping legs are abutted with the upper end faces of the limiting stepped portions.

[0007] As preferred, the PCB insulation sleeve comprises an insulation sleeve shell and sensor mounting chambers, the insulation sleeve shell is internally provided with two upwardly extending sensor mounting chambers, the sensor mounting chambers are internally provided with downwardly opening mounting cavities for mounting sensors, the inner cavity of the base is provided with a plurality of support units for supporting the insulation sleeve shell, the lower end face of the insulation sleeve shell is abutted with the upper end face of the support units, the two sides of the flow meter housing are symmetrically provided with limiting stepped portions, the lower end face of the limiting stepped portions is abutted with the upper end face of the insulation sleeve shell, the inner wall of the insulation sleeve shell and the periphery of the sensor mounting chambers are provided with an insertion cavity for inserting the lower end of the flow meter housing, and the insertion cavity is provided with an opening facing the flow meter housing.

[0008] As preferred, the support units are arranged at intervals along the length direction of the PCB board, each group of support units comprises two symmetrically arranged support bodies on the two sides of the PCB board, and the two support bodies are provided with a gap adapted to the PCB board.

[0009] As preferred, the two sides of the PCB insulation sleeve are symmetrically provided with inclined guide portions, and the bottom of the PCB insulation sleeve is provided with a mounting clamping groove adapted to the PCB board.

[0010] The present application has the advantages that the lower part of the flow meter housing is sequentially provided with the PCB insulation sleeve and the base, the impeller chamber is once insulated and sealed, and the PCB insulation sleeve below the impeller chamber is twice insulated and sealed, so that the double insulation effect is achieved, thereby meeting the national standard requirements when the flow meter power supply adopts a low-cost non-isolated power supply, and effectively improving the user's electric shock protection.

[0011] The features and advantages of the present application will be described in detail with reference to the embodiments and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is an exploded schematic view of the structure of a double-insulated flowmeter of the present application;

[0013] Figure 2 is a schematic view of the perspective structure of a double-insulated flowmeter of the present application;

[0014] Figure 3 is a schematic view of the front view of a double-insulated flowmeter of the present application;

[0015] Figure 4 is a schematic view of the C-C cross section of a double-insulated flowmeter of the present application;

[0016] Figure 5 is a schematic view of the structure of a PCB insulation sleeve of a double-insulated flowmeter of the present application;

[0017] Figure 6 is a schematic view of the C-C cross section of a base of a double-insulated flowmeter of the present application.

DETAILED DESCRIPTION

[0018] Referring to Figures 1 to 4 The double-insulated flowmeter of the present application comprises a flowmeter housing 1, an impeller assembly 10 arranged inside the flowmeter housing, a sensor 100 for collecting the rotating impeller signal, and a PCB 30 electrically connected to the sensor 100. The flowmeter housing 1 is sequentially provided below with a PCB insulation sleeve 3 and a base 2. The base 2 is connected to the flowmeter housing 1 in a clamping fit. The PCB insulation sleeve 3 is installed in the cavity between the flowmeter housing 1 and the base 2. The flowmeter housing 1 has a clamping cavity 14 adapted to the PCB insulation sleeve 3. The upper part of the PCB insulation sleeve 3 is inserted into the clamping cavity 14, and an enclosed area is formed between the upper wall of the PCB insulation sleeve 3 and the clamping cavity 14. The PCB insulation sleeve 3 has an inner cavity for installing the sensor 100. The PCB 30 is installed at the bottom of the PCB insulation sleeve 3.

[0019] Further, referring to Figure 3 and Figure 4 The flowmeter housing 1 is provided with an impeller chamber 11 communicating with the water inlet and outlet channels of the flowmeter. The impeller assembly 10 is installed in the impeller chamber 11. The impeller chamber 11 is symmetrically provided on both sides with first mounting chambers 12. The first mounting chambers 12 have clamping cavities 14 inside. The PCB insulation sleeve 3 is provided with two sensor mounting chambers 32 extending upward as protrusions. The sensor mounting chambers 32 are inserted into the clamping cavities 14, and a concave cavity adapted to the impeller chamber 11 is formed between the two sensor mounting chambers 32. The bottom of the PCB insulation sleeve 3 and the base 2 have a cavity for installing the PCB 30. A sealed chamber can be formed between the PCB insulation sleeve and the impeller chamber, preventing the leakage of fluid into the inner cavity of the sensor mounting chamber.

[0020] Further, referring to Figure 4 and Figure 6 , two sides of the base 2 are symmetrically provided with clamping plates 22 matched with the flowmeter shell 1, the inner wall of the clamping plate 22 is provided with a clamping leg 221 protruding inward, and the two sides of the flowmeter shell 1 are symmetrically provided with limiting stepped portions 13, the clamping plate 22 is matched with the limiting stepped portion 13, and the lower end surface of the clamping leg 221 is matched with the upper end surface of the limiting stepped portion 13, facilitating the installation and disassembly of the base and the flowmeter shell.

[0021] Further, referring to Figures 4 to 6 , the PCB insulation sleeve 3 includes an insulation sleeve shell 31 and a sensor mounting chamber 32, the inside of the insulation sleeve shell 31 has two upwardly extending protruding sensor mounting chambers 32, the sensor mounting chamber 32 has an installation cavity 301 opening downwardly for installing a sensor 100, the inner cavity of the base 2 is provided with a plurality of support units 21 for supporting the insulation sleeve shell 31, the lower end surface of the insulation sleeve shell 31 is matched with the upper end surface of the support unit 21, the two sides of the flowmeter shell 1 are symmetrically provided with limiting stepped portions 13, the lower end surface of the limiting stepped portion 13 is matched with the upper end surface of the insulation sleeve shell 31, the inner wall of the insulation sleeve shell 31 and the periphery of the sensor mounting chamber 32 have an insertion installation cavity 300 for inserting the lower end of the flowmeter shell 1, and the insertion installation cavity 300 has an opening towards the flowmeter shell 1. The support units 21 are arranged at intervals along the length direction of the PCB board 30, each group of support units 21 is composed of two support bodies symmetrically arranged on the two sides of the PCB board 30, and the two support bodies have a gap matched with the PCB board 30. The insulation sleeve shell is supported by the support units, and the limiting stepped portion of the flowmeter shell presses the insulation sleeve shell, so that the insulation sleeve shell is firmly and stably installed. The two sides of the PCB insulation sleeve 3 are symmetrically provided with inclined guide-in portions 311, and the bottom of the PCB insulation sleeve 3 is provided with an installation clamping groove 312 matched with the PCB board 30. The guide-in portions are arranged to facilitate quick installation, and the installation clamping groove is arranged to facilitate the installation and positioning of the PCB board.

[0022] The working process of the application is as follows:

[0023] The double-insulation flowmeter can realize primary insulation sealing through the impeller chamber, and can realize secondary insulation sealing through the closed area formed between the upper wall of the PCB insulation sleeve and the flowmeter shell, so as to achieve the effect of double insulation, thereby meeting the requirements of the national standard when the flowmeter power supply adopts a low-cost non-isolated power supply, and effectively improving the protection against electric shock of the user.

[0024] The above examples are illustrative of the present application and are not limiting. Other embodiments of the present application will readily occur to those skilled in the art. The application is limited only by the claims.

Claims

1. A double insulation flowmeter, comprising a flowmeter housing (1), an impeller assembly (10) arranged inside the flowmeter housing, a sensor (100) for collecting a rotating impeller signal, and a PCB board (30) electrically connected with the sensor (100), characterized in that: The lower part of the flowmeter shell (1) is sequentially provided with a PCB insulation sleeve (3) and a base (2), the base (2) is connected with the flowmeter shell (1) through clamping fitting, the PCB insulation sleeve (3) is installed in the cavity between the flowmeter shell (1) and the base (2), the flowmeter shell (1) has a clamping cavity (14) matched with the PCB insulation sleeve (3) in the inside, the upper part of the PCB insulation sleeve (3) is inserted into the clamping cavity (14), and a closed area is formed between the upper wall of the PCB insulation sleeve (3) and the clamping cavity (14). The PCB insulation sleeve (3) has an inner cavity for installing a sensor (100), the PCB board (30) is installed at the bottom of the PCB insulation sleeve (3), the flowmeter shell (1) is provided with an impeller chamber (11) communicated with the water inlet and outlet channels of the flowmeter, the impeller chamber (11) is installed with an impeller assembly (10), the two sides of the impeller chamber (11) are symmetrically provided with first installation chambers (12), the first installation chambers (12) have clamping cavities (14) in the inside, the PCB insulation sleeve (3) is provided with two sensor installation chambers (32) extending upwards, the sensor installation chambers (32) are inserted into the clamping cavities (14), and a concave cavity matched with the impeller chamber (11) is formed between the two sensor installation chambers (32). The bottom of the PCB insulation sleeve (3) and the base (2) have a cavity for installing the PCB board (30), the two sides of the base (2) are symmetrically provided with clamping plates (22) matched with the flowmeter shell (1), the inner wall of the clamping plate (22) is provided with a clamping leg (221) protruding inward, the two sides of the flowmeter shell (1) are symmetrically provided with limiting stepped portions (13), the clamping plate (22) is clamped and matched with the limiting stepped portions (13), the lower end surface of the clamping leg (221) is matched with the upper end surface of the limiting stepped portions (13), the PCB insulation sleeve (3) comprises an insulation sleeve shell (31) and sensor installation chambers (32), the insulation sleeve shell (31) has two sensor installation chambers (32) extending upwards in the inside, the sensor installation chambers (32) have installation cavities (301) opening downward for installing the sensor (100), the inner cavity of the base (2) is provided with a plurality of support units (21) for supporting the insulation sleeve shell (31), the lower end surface of the insulation sleeve shell (31) is matched with the upper end surface of the support unit (21), the two sides of the flowmeter shell (1) are symmetrically provided with limiting stepped portions (13), the lower end surface of the limiting stepped portions (13) is matched with the upper end surface of the insulation sleeve shell (31), the inner wall of the insulation sleeve shell (31) and the periphery of the sensor installation chamber (32) have an insertion cavity (300) for inserting the lower end of the flowmeter shell (1), and the insertion cavity (300) has an opening towards the flowmeter shell (1).

2. A double insulated flowmeter as claimed in claim 1, characterised in that: The support units (21) are arranged at intervals along the length direction of the PCB (30), and each group of support units (21) is composed of two support bodies symmetrically arranged on both sides of the PCB (30), and the two support bodies have a gap matched with the PCB (30).

3. A double-jacketed flowmeter as claimed in claim 1 or 2, characterized in that: The PCB insulating sleeve (3) is symmetrically provided with inclined guide-in portions (311) on both sides, and the bottom of the PCB insulating sleeve (3) is provided with a mounting clamping groove (312) matched with the PCB (30).

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