Principle and application of brazed plate heat exchanger
1. Overview of the principle
Brazed plate heat exchanger is an efficient heat exchange equipment, its core principle is the use of a series of metal plates composed of the flow channel, so that two or more fluids in the plate heat exchange. The brazing technology is to fill the joint gap after melting the brazing metal to achieve a solid connection between the metals. In plate heat exchangers, the needle welding technology ensures the tightness and structural strength of the plates and provides a stable heat exchange environment for the fluid.
2. Plate structure and characteristics
Plate heat exchangers are composed of a series of corrugated metal plates superimposed, and a thin and uniform flow channel is formed between the plates. Its features include compact structure, high heat transfer efficiency, small footprint, easy weight maintenance and so on. In addition, the plate heat exchanger also has the advantages of strong adaptability, easy expansion and flexible combination, which can meet the heat exchange needs of different occasions and processes.
3. Brazing process principle
In the process of brazing, the filler metal is melted and filled in the gap between the plates, and penetrates into the joint gap through capillary action to form the connection between the metals. The brazing process requires strict control of parameters such as brazing temperature, time and graphite force to ensure that the brazing filler metal is fully melted and a good joint is formed. The heat exchanger after brazing has high sealing and structural strength, and can withstand the pressure and temperature changes generated during the working process.

Model	BL26
Width, A [mm]	111
Height, B [mm]	310
Length, E [mm]	10+2.36n
Horizontal port distance, C [mm]	50
Vertical port distance, D [mm]	250
Max pressure [Mpa]	3
Max flowrate [M3/h]	8.1
Weight [kg]	1.3+0.12n

Model

BL1

Model	BL14	BL20	BL26	BL26C	BL50	BL95
Width, A [mm]	78	76	111	124	111	191
Height, B [mm]	206	310	310	304	525	616
Length, E [mm]	9+2.3n	9+2.3n	10+2.36n	13+2.4n	10+2.35n	11+2.35n
Horizontal port distance, C [mm]	42	42	50	70	50	92
Vertical port distance, D [mm]	172	282	250	250	466	519
Max pressure [Mpa]	3	3	3	3/4.5	3/4.5	3/4.5
Max flowrate [M3/h]	3.6	3.6	8.1	8.1	12.7	39
Weight [kg]	0.6+0.06n	1.0+0.08n	1.3+0.12n	2.2+0.16n	2.6+0.19n	7.8+0.36n

Model	BL120	BL190	BL200	BL1400	BL100 *	BL200 *
Width, A [mm]	246	307	321	429	248	322
Height, B [mm]	528	696	738	1398	495	739
Length, E [mm]	13+2.36n	13+2.75n	13+2.7n	22+2.78n	10+2.15n	13+2.55n
Horizontal port distance, C [mm]	174	179	188	220	157	205.2
Vertical port distance, D [mm]	456	567	603	1190	405	631
Max pressure [Mpa]	3	3	2.1	1.5	3/4.5	3/4.5
Max flowrate [M3/h]	42	100	100	300	42	100
Weight [kg]	7.2+0.52n	12.5+0.72n	13+0.75n	31.8+1.73n	6.5+0.37n	13+0.78n