Plate heat exchanger has been widely used in food, machinery, metallurgy, petrochemical industry, ships and other fields. Plate heat exchanger has the characteristics of high heat transfer coefficient, small pressure drop, compact structure, light weight, small occupied space, convenient combination of area and process, strong versatility of parts, wide choice of materials and easy realization of large-scale production. And become the leading heat exchange equipment in rural central heating projects. In order to ensure the normal operation of plate heat exchanger and prolong the service life of key components such as plates and rubber pads, it is particularly important to know the faults of plate heat exchanger, their causes and disposal methods.

Plate heat exchanger is a very efficient heat exchange equipment, which is widely used. The core components of plate heat exchanger are plate heat exchanger and sealing rubber pad. The development level of sealing rubber pad directly determines the development level of plate heat exchanger, and the sealing failure of plate heat exchanger is a very important production failure. So what is the reason for the sealing failure of plate heat exchanger?

1 pressure influence

When the detachable plate heat exchanger is used at the rated working pressure, it will cause leakage. Apart from the quality factors in the manufacturing and assembly of the device, it is generally related to the abnormal impact load in the system, which is not easy for ordinary operators to check. The instantaneous pressure peak caused by the impact is often about 2 times higher than the normal working pressure, which makes the rubber gasket installed in the plate heat exchanger shift and makes the sealing of the plate heat exchanger invalid. Because the heat transfer element of this kind of device is made of stainless steel sheet, its sealing rigidity is relatively poor, and its sealing periphery is very long, so its impact resistance is lower than that of shell-and-tube heat exchanger.

2 time influence

Or the equipment that has been idle for several years, the aging of the sealing material itself may affect the sealing reliability, so the maintenance opportunity should be taken to replace the new sealing gasket in time.

3 Temperature influence

The rapid change of temperature can also lead to seal failure. When the temperature changes quickly, the linear expansion coefficient, elastic deformation and sealing preload of the rubber gasket will not match, which will reduce the sealing preload and lead to the pressure bearing capacity of the device being much lower than the rated design pressure.

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