Plate heat exchanger

Abstract

The invention belongs to the technical field of heat exchange equipment, and particularly relates to a novel plate heat exchanger. The plate heat exchanger comprises a heat exchange matrix which is formed by stacking a plurality of heat exchange plates having through holes, and pull rods which are fixedly connected with a front end plate and a rear end plate in a penetrating manner and allow the front end plate and the rear end plate to be rigidly matched with a heat exchange plate group, wherein guide channels used for guiding media are formed among sticking faces of the adjacent heat exchange plates; the through holes in the heat exchange plates are formed coaxially to form liquid inlet holes and liquid outlet holes which are communicated with peripheral equipment; the front end plate and the rear end plate which are used for clamping the heat exchange matrix are arranged on the front end face and the rear end face of the heat exchange matrix; heat exchange ducts which penetrate through plate bodies of the front end plate and the rear end plate, and are coaxially matched with the liquid inlet holes and the liquid outlet holes in the heat exchange matrix are arranged on the front end plate and the rear end plate; and gaps for allowing the heat exchange matrix to move in radial directions of the liquid inlet holes and the liquid outlet holes of the heat exchange matrix are reserved between the heat exchange matrix and the front end plate, and between the heat exchange matrix and the rear end plate. The plate heat exchanger is simple in structure, and can still have good safety and reliability under the conditions of high temperature, high pressure, and harsher pressure and temperature variation.

Description

technical field [0001] The invention belongs to the technical field of heat exchange equipment, and in particular relates to a novel plate heat exchanger. Background technique [0002] Heat exchange elements are the main components of heat exchange equipment such as various heat exchangers, air coolers, evaporators, and preheaters. There are many types and types of heat exchange elements, and they are mainly divided into two categories: tube bundles and plate types. Its plate heat exchanger is a new type of high-efficiency heat exchanger that is stacked by a series of metal sheets with a certain corrugated shape; thin rectangular channels are formed between various plates, and heat exchange is performed through half sheets. Plate heat exchanger is an ideal equipment for liquid-liquid and liquid-vapor heat exchange. Compared with tube bundle heat exchangers, plate heat exchangers have high heat exchange efficiency, small heat loss, compact and light structure, and occupy an ...

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Problems solved by technology

When the above-mentioned structure is in use, the traditional all-steel constraint is changed into a flexible constraint, which solves the problem of heat resistance and pressure resistance of the current heat exchanger. However, on the one hand, due to the continuous compression of the compression spring itself, it is often prone to Fatigue deformation, which affects the actual use state of the heat exchanger; at the same time, the compression spring is not a rigid constraint after all. Under the effect of long-term thermal expansion and contraction, the heat exchange matrix is ​​often caused by the decrease of the compression force. There is a difference in the relative position of the metal end plate, which leads to excessive load-bearing and structural problems of the inlet and outlet channels passing through the two, which need to be avoided when using; on the other hand, the structure only focuses on The purpose of flexible restraint in the axial direction of the tie rod is not described, but there is no description of the restraint along the radial direction of the tie rod, that is, the direction of the plate surface. In order to pursue structural stability, the inner hole wall of the channel and the outer wall of the flange connecting the inlet and outlet channels and the external equipment pipeline adopt strict screw connection or tight insertion structure, and there is no relative displacement in the radial direction between them. Both lead to the reduction of its temperature and pressure resistance; in addition, the temperature change rate is inversely proportional to the thickness of the metal part. When the thickness difference between the two metal parts A and B is large, the temperature difference between the two is mainly determined by the thickness Determined by the temperature change rate of smaller metal parts, the plates of the current structure are fully welded to each other, and the plate body and the metal end plate are directly welded against each other, and the thickness difference between the two is extremely large. Metal parts, namely plates, are very sensitive to temperature changes, and their own temperature difference per unit time is much greater than that of thicker metal parts, namely thick plates, so that under welding constraints, the thin plate-shaped plate produces instantaneous temperature difference stress

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