A waterproof steam filter

Abstract

This utility model relates to a waterproof vapor filter, belonging to the field of lead-acid battery manufacturing technology. It primarily addresses the problems of existing polytetrafluoroethylene (PTFE) vapor filters, which cannot completely prevent water vapor loss and result in significant water consumption. Its main features are: it consists of a central support carrier and a first waterproof and breathable membrane and a second waterproof and breathable membrane respectively covering the upper and lower surfaces of the support carrier; the support carrier is made of polytetrafluoroethylene. This utility model features reduced internal and external pressure difference within the battery, effective prevention of water vapor escape from the battery, prevention of water loss, and extended battery life. It is mainly used as a vapor filter in the middle of the exhaust pipe in the small cover of a lead-acid battery.

Description

Technical Field

[0001] The utility model belongs to the technical field of lead-acid battery production and manufacturing, and specifically relates to a waterproof steam filter. Background Art

[0002] The steam filter is a part required for battery production. The steam filter is in the battery cover and installed in the middle of the exhaust pipe. The main function of the steam filter is to prevent water loss, acid outflow, and external liquid from flowing back into the battery. The shape of the steam filter is coin-shaped and the material is polytetrafluoroethylene.

[0003] The existing polytetrafluoroethylene steam filter has the disadvantages of being unable to completely block the loss of water vapor and having a large water loss. Summary of the invention

[0004] The utility model aims to overcome the above-mentioned shortcomings and provide a waterproof steam filter which can reduce the pressure difference between the inside and outside of the battery, effectively prevent water vapor from escaping from the inside of the battery, prevent the battery from losing water and prolong the service life of the battery.

[0005] The technical solution of the utility model is: a waterproof steam filter, which is characterized by: consisting of a middle support carrier and a first waterproof breathable membrane and a second waterproof breathable membrane respectively covering the upper and lower surfaces of the support carrier; the support carrier is a support carrier made of polytetrafluoroethylene.

[0006] The support carrier described in the technical solution of the utility model is a support carrier made of polytetrafluoroethylene with large pore size.

[0007] The pore size of the large-pore polytetrafluoroethylene described in the technical solution of the utility model is 100-500 um.

[0008] The thickness of the support carrier described in the technical solution of the utility model is 3-5 mm.

[0009] The first waterproof breathable membrane and the second waterproof breathable membrane described in the technical solution of the utility model are waterproof breathable membranes made of polytetrafluoroethylene resin.

[0010] The first waterproof breathable membrane and the second waterproof breathable membrane described in the technical solution of the utility model have a pore size of 5-10 um and a thickness of 1-2 mm.

[0011] The first waterproof breathable membrane, the supporting carrier and the second waterproof breathable membrane described in the technical solution of the utility model are circular.

[0012] The utility model adopts a waterproof steam filter composed of a middle support carrier and a first waterproof breathable membrane and a second waterproof breathable membrane respectively covering the upper and lower surfaces of the support carrier, wherein the support carrier is a support carrier made of polytetrafluoroethylene material, so the waterproof breathable membrane attached to the surface can firstly effectively isolate moisture, salt or other corrosive liquids; secondly, the surface tension is very small, the friction coefficient is also low, and no substance will adhere to it. When it contacts a large amount of moisture, it will not penetrate through it, and the breathability can be quickly restored; thirdly, it has good mechanical toughness and can maintain an elongation rate of 5% under low temperature conditions.

[0013] The utility model has the characteristics of reducing the pressure difference between the inside and outside of the battery, effectively preventing water vapor from escaping from the inside of the battery, preventing the battery from losing water and extending the battery life. It is mainly used for the steam filter in the middle of the exhaust pipe in the small battery cover of the lead-acid battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] Markings in the figure: 1-first waterproof and breathable membrane; 2-support carrier; 3-second waterproof and breathable membrane. DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with the embodiments.

[0017] like Figure 1 As shown, an embodiment of a waterproof air filter of the utility model is composed of a central support carrier 2 and a first waterproof air-permeable membrane 1 and a second waterproof air-permeable membrane 3 respectively covering the upper and lower surfaces of the support carrier 2.

[0018] Among them, the support carrier 2 is a large-pore polytetrafluoroethylene support carrier with a thickness of 3-5 mm and a pore size of 100-500 um. Polytetrafluoroethylene, with a chemical formula of (C2F4)n, is a high molecular polymer whose main components are chain structural units formed by carbon atoms and fluorine atoms tightly bound by covalent bonds. This high-performance thermoplastic has unique chemical stability, high temperature resistance, low friction coefficient, excellent electrical insulation performance and strong resistance to chemical corrosion.

[0019] The first waterproof breathable membrane 1 and the second waterproof breathable membrane 3 are the same waterproof breathable membrane. The first waterproof breathable membrane 1 and the second waterproof breathable membrane 3 are made of polytetrafluoroethylene resin particles, and are expanded and stretched to form a microporous film with a pore size of 5-10 um and a thickness of generally 1-2 mm. It can effectively block atomized water in the air (the minimum diameter is generally 20-100 um).

[0020] Preparation process: The first waterproof breathable membrane 1 and the second waterproof breathable membrane 3 are covered on the surface of the support carrier 2 with a bonding structure, placed in an autoclave, and subjected to a process of heating, pressurizing, heat preservation (medium temperature or high temperature), pressure maintenance, pressure reduction and pressure release to form them and then shear them into a circular steam filter sheet, which is a conventional process.

[0021] Advantages: A. The utility model uses large-aperture polytetrafluoroethylene material for better air permeability, and the waterproof breathable membrane attached to the surface can effectively isolate moisture, salt or other corrosive liquids; B. The waterproof breathable membrane has a very small surface tension and a low friction coefficient, and will not adhere to any substance. When it comes into contact with a large amount of water, it will not penetrate through and can quickly restore air permeability; C. The waterproof breathable membrane has good mechanical toughness and can maintain a 5% elongation rate under low temperature conditions.

[0022] Our company uses large-pore polytetrafluoroethylene material as the support carrier of the air filter and covers its surface with a waterproof and breathable membrane. The advantages are: first, it reduces the pressure difference between the inside and outside of the battery to prevent the battery from bursting; second, it effectively prevents water vapor from escaping from the battery, prevents the battery from losing water, and extends the battery life.

Claims

1. A waterproof steam filter, characterized by: A circular air filter is formed by a central support carrier (2) and a first waterproof breathable membrane (1) and a second waterproof breathable membrane (3) respectively covering the upper and lower surfaces of the support carrier (2); the support carrier (2) is a support carrier made of polytetrafluoroethylene; the thickness of the support carrier (2) is 3-5 mm; the first waterproof breathable membrane (1) and the second waterproof breathable membrane (3) are waterproof breathable membranes made of polytetrafluoroethylene resin; the thickness of the first waterproof breathable membrane (1) and the second waterproof breathable membrane (3) is 1-2 mm.

2. The waterproof steam filter according to claim 1, characterized in that: The support carrier (2) is a support carrier made of large-pore polytetrafluoroethylene material.

3. A waterproof steam filter according to claim 1 or 2, characterized in that: The first waterproof breathable membrane (1) and the second waterproof breathable membrane (3) are covered on the surface of the supporting carrier (2) by means of an adhesive bonding structure.

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