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Flow instrument housing

A flow meter and housing technology, applied in the field of the flow meter housing, can solve the problems of high housing cost, easy rusting of the cast iron housing, affecting the service life of the flow meter, measurement accuracy, etc.

Inactive Publication Date: 2005-11-02
陶晓滨
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cast iron shells are generally easy to rust, and the cost of copper shells is relatively high
In addition, the non-metallic support frame used to support and position the impeller in the flowmeter is an interference fit with the metal shell. If the liquid or gas to be measured is a high-temperature liquid or gas, it will cause thermal deformation of the support frame and the shell. Due to the different thermal expansion coefficients of non-metal and metal, the temperature changes, and the inconsistent deformation of the two will affect the service life and measurement accuracy of the flowmeter.

Method used

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Experimental program
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specific Embodiment approach 1

[0005] Specific implementation mode one: the following combination figure 1 This embodiment will be specifically described. This embodiment is composed of a plastic casing 1 and connecting pipe fittings 2 arranged on both sides of the casing 1. The casing 1 and the connecting pipe fittings 2 communicate with each other and are integrated by injection molding. One end of the connecting pipe fitting 2 is buried in the solid tissue of the casing 1, and the other end of the connecting pipe fitting 2 is provided with an external thread or an internal thread. With such an arrangement, the connection between the connecting pipe piece 2 and the casing 1 is relatively firm.

specific Embodiment approach 2

[0006] Specific implementation mode two: the following combination figure 2 This embodiment will be specifically described. The difference between this embodiment and the first embodiment is that it also includes an embedded plate 3 , the embedded plate 3 made of metal is contained in the solid tissue of the shell 1 and is fixedly connected with the connecting pipe 2 . The casing of the flow meter arranged in this way has higher strength, and in addition, the embedded plate 3 does not contact liquid or gas, and the heat deformation is also small.

specific Embodiment approach 3

[0007] Embodiment 3: The difference between this embodiment and Embodiment 1 or Embodiment 2 is that the material of the shell 1 is polypropylene random copolymer, English abbreviation (PPR).

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Abstract

The invention discloses shell of flow meter, which comprises plastic out shell (1) and connecting pipe fitting (2) connected to both sides of out shell (1). The out shell (1) and connecting pipe fitting (2) interconnect to each other and become an one part by injection molding. Connecting pipe fitting (2) is used to connect flow meter to liquid or gas transmission pipe with its impeller set directly in out shell (1); the inside surface of out shell (1) can be injection molding to structure and shape to support and locate the impeller; when the temperature of liquid or gas changes, plastic out shell (1) changes little and has no influence to impeller rotation and the measurement precision. The cost of plastic out shell is less than that of copper.

Description

Technical field: [0001] The invention relates to a casing of a flow meter. Background technique: [0002] The flow meter used to measure the flow of liquid or gas is generally made of cast iron or copper. Cast iron shells are generally prone to rust, and shells made of copper are more expensive. In addition, the non-metallic support frame used to support and position the impeller in the flowmeter is an interference fit with the metal shell. If the liquid or gas to be measured is a high-temperature liquid or gas, it will cause thermal deformation of the support frame and the shell. Due to the different thermal expansion coefficients of non-metal and metal, the temperature changes, and the inconsistent deformation of the two will affect the service life and measurement accuracy of the flowmeter. At present, there are a variety of plastic materials on the market, such as random copolymerized polypropylene (ie PPR), ABS and polyphenylene oxide (ie PPO), etc., all of which have...

Claims

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Application Information

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IPC IPC(8): G01F15/00
Inventor 陶晓滨
Owner 陶晓滨
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