Fuel oil heater of fuel oil filters

Abstract

The invention of a fuel oil heater of fuel oil filters refer to fields of matching apparatus of motor vehicle fuel systems; the heating unit (2) composed of thermal resistor heater bands PTC is fasten in a heater uniformly in a way of external insulation and sealing, the heater is configured in such a way that circular ring plates (3) are integrated in a layered manner or is configured with ring substrate (20) with groove (21); the heater is arranged in cylindric main body (8) of mounting rack and fastened with carriage (12) of locating short tube (13), bimetallic temperature controller ZK is arranged on outer insertion type joint (15) of external power lead (16) and is leaded in through by-pass port (11) sealedly, two electrode connections (6) of the heater are inserting connected with joint (15); thermal resistor heater bands PTC are pre-pressed on the whole and connected with battery lead plate without exposure to outside, bimetallic temperature controller ZK and thermal resistor heater bands PTC and erection fixture are separately installed, the erection fixture is made of metallic materials; the invention can ensure safety, stability of effect and accuracy of automatic control temperature, parts can be replaced easily, and installation and usage is convenient, the invention can remain No. 0 diesel oil at 7 to 24 DEG C in winter, and is particularly applicable to diesel vehicles.

Description

technical field [0001] The invention belongs to the technical field of matching devices for a fuel system of a motor vehicle, and relates to a fuel heater for a fuel filter. Background technique [0002] In the prior art, the fuel heater of the fuel filter with the thermistor heating sheet PTC sheet as the heating element, in terms of its overall structure, Chinese patent ZL200920109398 · 7 integrated structure, integrally inserted into the fuel filter The center tube of the device is immersed in the fuel, and the PTC sheet and its corresponding electrode plates are exposed and directly immersed in the fuel, so that the fuel is in direct contact with electricity. The disadvantage is that once it encounters metal impurities mixed in the fuel Or charged substances—even the increase in the concentration of water with high molecular polarity cannot ensure the avoidance of short circuit, that is, there is a certain degree of unsafe factors: in addition, the PTC sheet is connected...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the fuel heater of the fuel filter with the thermistor heating sheet PTC sheet as the heating element, in terms of its overall structure, Chinese patent ZL200920109398 · 7 integrated structure, integrally inserted into the fuel filter The center tube of the device is immersed in the fuel, and the PTC sheet and its corresponding electrode plates are exposed and directly immersed in the fuel, so that the fuel is in direct contact with electricity. The disadvantage is that once it encounters metal impurities mixed in the fuel Or charged substances—even the increase in the concentration of water with high molecular polarity cannot ensure the avoidance of short circuit, that is, there is a certain degree of unsafe factors: in addition, the PTC sheet is connected to the electrode plate through spring sheet compression, which is insufficient. The reason is that the PTC sheet is unevenly stressed and easily cracked. Therefore, poor contact between the PTC sheet and the electrode plate is prone to occur, which affects the use effect and increases the production cost; the shielding end of the integrated structure is that no matter what parts If there is a problem with the component, it must be taken out and replaced as a whole due to its structural composition. On the other hand, because the bimetallic thermostat ZK is very close to the PTC sheet, its temperature control temperature cannot reflect the actual temperature change of the fuel in time.

There is also a product similar to the above-mentioned patent, which is also an integral structure. It is integrally clamped between the fuel filter and the corresponding car filter seat and immersed in the fuel. Its basic structure is that it has an integral plastic mounting frame. It is equipped with an externally exposed PTC sheet, which is also connected to the electrode plate by pressing the spring sheet. In terms of structural composition, it is not substantially different from the above patent, except that there is no bimetallic thermostat ZK, so it has the same disadvantages as above In addition, it does not have automatic temperature control, so the application is very inconvenient. In addition, due to its structural composition, it must be made of insulating plastic material for the installation frame. When the change is large, it is easy to deform and leak oil

Therefore, there is no any kind of fuel oil heater in the market so far, which is recognized as safe, reliable, convenient and effective, and is widely used, especially for diesel motor vehicles, which is a big shortcoming.

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