Multi-flow detectable and maintainable plate heat exchanger

Abstract

The utility model relates to a multi-flow detectable and maintainable plate heat exchanger which comprises a front end plate (1), a rear end plate (2), two connecting pipes (3), a plate sheet A and a plate sheet B. The plate sheets are stacked to form a liquid side channel (12) and a gas side channel (11) which are arranged alternately, and the two connecting pipes (3) are communicated with the liquid side channel and serve as a liquid medium inlet and a liquid medium outlet respectively. A plurality of flows (6) are arranged in a liquid side channel (12), a flow channel (7) and a flow interval (8) are arranged between every two adjacent flows (6), every two adjacent flows (6) are separated through the corresponding flow interval (8), every two adjacent flows (6) are communicated through the corresponding flow channel (7), a detection and maintenance channel (9) is arranged in each flow interval (8), one end of each detection and maintenance channel (9) is open and starts from the edge of a plate, and the other end of each detection and maintenance channel (9) is open. And the other end is closed and extends to the flow channel (7). The fluid channeling position can be conveniently and accurately detected and maintained through the detection and maintenance channel.

Description

Technical Field

[0001] The utility model discloses a brazing plate heat exchanger, belonging to the technical field of heat exchangers. Background Art

[0002] In plate heat exchangers, to improve system energy recovery and utilization and obtain a high-quality heat source, it is necessary to increase the inlet and outlet temperature difference of the medium and raise the outlet temperature of the medium. To achieve this goal, the heat exchange channel on the liquid side needs to be extended as much as possible. However, the length of the plate heat exchanger cannot be extended indefinitely. Generally, multiple processes are set on the same heat exchange plate, with spacing surfaces and process channels between each process.

[0003] During actual use, this type of multi-pass plate heat exchanger was found to have significant variations in heat transfer performance despite the presence of identical plates. Dissection of the plates revealed that the gaps between the various passes were poorly welded, allowing the medium to flow directly from the gaps into the next pass, resulting in underutilized passes (short-circuiting).

[0004] During the actual production inspection process, since multiple processes are in one cavity and the process separation surface is inside the heat exchanger, conventional pressure testing and air tightness testing cannot detect the separation surface welds. When process cross-flow occurs, the cross-flow heat exchanger cannot be repaired. Utility Model Content

[0005] The utility model aims to solve the above problems and provides a multi-process detectable and maintainable brazed plate heat exchanger, which can detect crosstalk problems between processes during production detection and facilitate accurate detection and maintenance of crosstalk locations.

[0006] The technical solution adopted by the present invention to solve the above-mentioned problems is: a multi-process detectable and maintainable plate heat exchanger, including a front end plate, a rear end plate, a connecting pipe, a plate A, and a plate B. Plate A and plate B are brazed front and back with copper foil brazing material to form a liquid side channel, and plate B and plate A are brazed front and back with copper foil brazing material to form a gas side channel. Two of the connecting pipes are connected to the liquid side channel, serving as the inlet and outlet of the liquid medium respectively. There are multiple processes in a liquid side channel, and process channels and process intervals are set between adjacent processes. Adjacent processes are separated by the process intervals, and adjacent processes are connected by the process channels. A detection and maintenance channel is provided in the process interval, and one end of the detection and maintenance channel is open and starts at the edge of the plate, and the other end is closed and extends to the process channel.

[0007] The detection and maintenance channel has sealing surfaces on both sides of its extension direction, separating adjacent flow paths at the intervals between them. The closed end of the detection and maintenance channel also serves as a sealing surface. If a sealing surface on one side fails, the liquid medium will flow into the detection and maintenance channel and then out of the open end of the channel.

[0008] The detection and maintenance channel extends in a straight line, which is convenient for detection and maintenance.

[0009] The width of the sealing surface is 2-6 mm, preferably 3-4 mm.

[0010] Compared with the prior art, the advantages of the present invention are: the present application sets up a detection and maintenance channel in the process interval, one end of which is closed and the other end is open, and the open end is connected to the outside world. Both sides of the detection and maintenance channel are sealing surfaces. When the airtight helium test is performed, if the sealing surfaces at the closed end or both sides fail, helium leaks through the detection and maintenance channel and is detected, and the failure point can be repaired through the detection and maintenance channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a front view of a plate heat exchanger in an embodiment of the present utility model;

[0012] Figure 2 This is a bottom view of the plate heat exchanger in the embodiment of the present utility model;

[0013] Figure 3 This is a surface flow diagram of the plate B in the liquid side channel in the embodiment of the present utility model;

[0014] Figure 4 This is a surface flow diagram of the plate A in the liquid side channel in the embodiment of the present utility model;

[0015] Figure 5 The process interval and process channel structure between adjacent processes in the embodiment of the present utility model;

[0016] Figure 6 This is a cross-sectional view of the process interval and the flow channel in the plate stacking direction in the embodiment of the present invention;

[0017] Figure 7 This is a cross-sectional view of the stacking direction of the plates in the embodiment of the present invention;

[0018] In the figure, 1 is the front end plate, 2 is the rear end plate, 3 is the connecting pipe, 4 is the plate A, 5 is the plate B, 6 is the process, 7 is the process channel, 8 is the process interval, 9 is the detection and maintenance channel, 10 is the sealing surface, 11 is the gas side channel, and 12 is the liquid side channel. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings. The embodiments described are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention. The textual descriptions in the embodiments correspond to the accompanying drawings, and the descriptions of the directions are also based on the descriptions of the accompanying drawings, and should not be construed as limiting the scope of protection of the present invention.

[0020] The multi-process detectable and repairable brazed plate heat exchanger of this embodiment includes a front plate 1, a rear plate 2, a pipe 3, plates A, and plates B. Plates A and B are stacked in layers with intervals, and adjacent plates are brazed with copper foil brazing filler metal. A liquid-side channel 12 is formed between the upper plate A and the lower plate B, and a gas-side channel 11 is formed between the upper plate B and the lower plate A. The gas-side channel is connected to the outside world. Two pipes 3 are provided on the front plate 1 and connected to the liquid-side channel 11. One of the two pipes 3 serves as an inlet for the liquid medium, and the other as an outlet for the liquid medium.

[0021] There are multiple processes 6 in the same layer of liquid side channel 12, and process channels 7 and process intervals 8 are provided between adjacent processes 6. Adjacent processes are connected end to end through the process channels 7 in sequence, and adjacent processes are separated by the process intervals 8. A detection and maintenance channel 9 is provided in the process interval 8. The detection and maintenance channel 9 is a linear channel with one end being open starting from the edge of the plate and connected to the outside world, and the other end being closed and extending to the end of the corresponding process channel 7.

[0022] The left and right sides of the detection and maintenance channel 9 are continuous sealing surfaces 10, and the closed end is also a sealing surface 10. The aforementioned sealing surface is formed by brazing the lower concave surface of plate A and the upper convex surface of plate B.

[0023] The number of detection and maintenance channels 9 = the number of flow channels of the single-layer liquid side channel - 1. Figure 5 As shown, the end sealing surface and the left and right side sealing surfaces of the detection and maintenance channel 9 are continuous, forming a long U-shaped sealing surface. The width of the sealing surface is 3-4 mm.

[0024] During the airtight helium test, if the end sealing surface and the left and right side sealing surfaces fail, helium will leak through the detection and maintenance channel and be detected, and the failure point can be repaired through the detection and maintenance channel.

[0025] In addition to the above embodiments, the present invention also includes other implementation methods. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of protection of the claims of the present invention.

Claims

1. A multi-process detectable and maintainable plate heat exchanger, comprising a front plate (1), a rear plate (2), a connecting pipe (3), a plate A, and a plate B, wherein the plate A and the plate B are brazed front and back with a copper foil brazing material to form a liquid side channel (12), and the plate B and the plate A are brazed front and back with a copper foil brazing material to form a gas side channel (11), and the connecting pipe (3) has two connecting pipes, both of which are connected to the liquid side channel, serving as an inlet and an outlet for the liquid medium, respectively, and is characterized in that: A plurality of processes (6) are arranged in a liquid side channel (12), and process channels (7) and process intervals (8) are provided between adjacent processes (6). Adjacent processes (6) are separated by the process intervals (8), and adjacent processes (6) are connected by the process channels (7). A detection and maintenance channel (9) is provided in the process interval (8), and one end of the detection and maintenance channel (9) is open and starts at the edge of the plate, and the other end is closed and extends to the process channel (7).

2. The multi-process detectable and maintainable plate heat exchanger according to claim 1, characterized in that: The detection and maintenance channel (9) has sealing surfaces (10) on both sides in the extension direction, and adjacent processes (6) are separated by two sealing surfaces at the process interval (8); the closed end of the detection and maintenance channel (9) is also a sealing surface.

3. The multi-process detectable and maintainable plate heat exchanger according to claim 1, characterized in that: The detection and maintenance channel (9) extends in a straight line.

4. The multi-process detectable and maintainable plate heat exchanger according to claim 2, characterized in that: The width of the sealing surface is 2-6 mm.

5. The multi-process detectable and maintainable plate heat exchanger according to claim 4, characterized in that: The width of the sealing surface is 3-4 mm.

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