Sectional sealing strip applied to plate-fin heat exchanger

Abstract

The utility model provides a sectional sealing strip applied to a plate-fin heat exchanger, which relates to the field of heat exchangers and comprises a strip-shaped sealing strip body in bilateral symmetry, and the sealing strip body is divided into an inlet section and an outlet section along the extension direction of the strip-shaped sealing strip body; the outlet section extends behind the inlet section; the upper surfaces, the left surfaces and the right surfaces of the inlet section and the outlet section are coplanar; the upper surface, the left surface and the right surface are all planes; the upper surface is horizontal; the left surface and the right surface are vertical; the lower side of the inlet section is a concave part; a convex part is arranged on the lower side of the outlet section; the inlet section and the outlet section are in transition connection through an arc surface at the joint. According to the sectional type sealing strip applied to the plate-fin heat exchanger, the problem that in the prior art, the sealing strip of the plate-fin heat exchanger is difficult to give consideration to medium impact resistance and medium retention at the same time is solved, impact damage to an inlet can be reduced, and flowing resistance at an outlet can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of heat exchangers, and more particularly to a segmented sealing strip applied to plate-fin heat exchangers. Background Technology

[0002] Plate-fin heat exchangers, as a mainstream heat exchange device in industry, consist of a core structure of parallel baffles, fins, and edge seals. Cold / hot flow channels are formed on both sides of the baffles. The seals are welded to the edges of the baffles, serving both to seal the channels and to provide structural support across the baffles. The cold / hot media flow through the channels at a certain initial velocity under the action of a pump, wherein:

[0003] For high-viscosity, high-density media such as hot oil, a high initial velocity is required to overcome flow resistance. However, high-speed flow will continuously impact the seal, and the frictional resistance between the fins and the seal surface will cause the flow velocity at the downstream end of the fluid to decrease, which may lead to stagnation.

[0004] In existing technologies, there are significant technical contradictions in the design of seal structures:

[0005] For example, the seal for plate-fin heat exchangers disclosed in Chinese patent application No. 202220921485.8 uses a concave design in the middle of the lower surface and an internal arc-shaped surface to concentrate the fluid impact at the bottom of the concave part, reducing the direct erosion of the weld. It is suitable for scenarios where the medium will subject the seal to high-pressure impact. However, after the fluid velocity decreases (such as at the rear end of the channel), the concave structure is prone to forming a vortex zone due to the sudden change in the cross-sectional area of ​​the flow channel, which exacerbates the risk of high-viscosity fluid retention.

[0006] For example, the sealing strip for plate-fin heat exchangers disclosed in Chinese patent application No. 201620989548.8 optimizes the flow channel curvature to reduce flow resistance and avoid stagnation of high-viscosity fluids through the design of the convex middle of the lower surface and the external arc surface. It is suitable for low flow rate and anti-blocking scenarios. However, the convex structure is difficult to effectively buffer high-speed impact at the fluid inlet, and the weld is prone to fatigue cracking due to kinetic load.

[0007] However, the above contradictions are particularly prominent when dealing with high-viscosity fluids (such as hot oil):

[0008] To ensure the normal passage of the medium, the inlet section requires a high initial velocity to drive the fluid in. However, although the concave structure can resist impact, it may exacerbate the inlet pressure drop due to the contraction of the flow channel. Meanwhile, the fluid velocity in the outlet section decreases due to frictional resistance. Although the convex structure can guide the flow, it cannot cope with the impact damage that has already occurred at the front end. Utility Model Content

[0009] To address the aforementioned technical problems, the segmented sealing strip provided by this utility model for use in plate-fin heat exchangers can reduce impact damage at the inlet and reduce flow resistance at the outlet.

[0010] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0011] The present invention provides a segmented sealing strip for plate-fin heat exchangers, comprising a symmetrical elongated sealing strip body, the sealing strip body being divided into an inlet segment and an outlet segment along the extension direction of the elongated shape; the outlet segment extending after the inlet segment; the upper, left, and right surfaces of the inlet and outlet segments are coplanar; the upper, left, and right surfaces are all planar; the upper surface is horizontal; the left and right surfaces are vertical; the lower side of the inlet segment is a recessed portion; the lower side of the outlet segment is a protruding portion; the inlet segment and the outlet segment are connected by a circular arc surface at the joint.

[0012] The segmented sealing strip for plate-fin heat exchangers provided by this utility model preferably has the following characteristics: the recessed portion is symmetrical left and right; the protruding portion is symmetrical left and right; the recessed portion includes a first lower surface; the protruding portion includes a second lower surface; both the first lower surface and the second lower surface are planar; the first lower surface and the left surface are transitioned to each other through an upwardly curved first arc surface; the first lower surface and the right surface are transitioned to each other through an upwardly curved second arc surface; the second lower surface and the left surface are transitioned to each other through a downwardly curved third arc surface; and the second lower surface and the right surface are transitioned to each other through a downwardly curved fourth arc surface.

[0013] The segmented sealing strip for plate-fin heat exchangers provided by this utility model preferably has an arc radius of less than π / 2 rad for the first arc surface, the second arc surface, the third arc surface, and the fourth arc surface.

[0014] The segmented sealing strip for plate-fin heat exchangers provided by this utility model preferably has a through hole inside the sealing strip body; the through hole is opened along the elongated extension direction of the sealing strip body; the through hole penetrates the inlet section and the outlet section.

[0015] The segmented sealing strip for plate-fin heat exchangers provided by this utility model preferably has a rectangular through hole; the long side of the through hole is parallel to the upper surface of the sealing strip body; and the shortest distance between the wide sides of the through hole is 1 / 2 of the distance between the left and right surfaces of the sealing strip body.

[0016] The above technical solution has the following advantages or beneficial effects:

[0017] This utility model provides a segmented sealing strip for plate-fin heat exchangers, relating to the field of heat exchangers. It includes a symmetrical, elongated sealing strip body, divided into an inlet section and an outlet section along the elongated direction. The outlet section extends after the inlet section. The upper, left, and right surfaces of the inlet and outlet sections are coplanar. The upper, left, and right surfaces are all planar. The upper surface is horizontal; the left and right surfaces are vertical. The lower side of the inlet section is a recess; the lower side of the outlet section is a protrusion. The inlet and outlet sections are connected by a rounded transition surface at their junction. This segmented sealing strip for plate-fin heat exchangers solves the problem in the prior art where sealing strips for plate-fin heat exchangers struggle to simultaneously resist media impact and retain media, reducing impact damage at the inlet and flow resistance at the outlet. Attached Figure Description

[0018] The present invention, its features, shape, and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference numerals denote like parts throughout the drawings. The drawings are not intentionally drawn to scale; the focus is on illustrating the gist of the invention.

[0019] Figure 1 This is a schematic diagram of the overall structure of the segmented sealing strip applied to a plate-fin heat exchanger provided in Embodiment 1 of this utility model.

[0020] Figure 2 This is a schematic diagram showing the positional relationship between the first and second lower surfaces of the segmented sealing strip applied to a plate-fin heat exchanger, as provided in Embodiment 1 of this utility model. Detailed Implementation

[0021] Example 1:

[0022] The segmented sealing strip for plate-fin heat exchangers provided in Embodiment 1 of this utility model, such as Figures 1 to 2 As shown, the seal includes a symmetrical, elongated body. The seal body is divided into an inlet section 1 and an outlet section 2 along the elongated extension direction. The outlet section 2 extends after the inlet section 1. The upper surface 3, left surface 4, and right surface 5 of the inlet section 1 and the outlet section 2 are coplanar. The upper surface 3, left surface 4, and right surface 5 are all planes. The upper surface 3 is horizontal. The left surface 4 and right surface 5 are vertical. The lower side of the inlet section 1 is a recessed part. The lower side of the outlet section 2 is a protruding part. The inlet section 1 and the outlet section 2 are connected by a circular arc surface at the joint.

[0023] The sealing strip body is a structural component used in plate-fin heat exchangers. Specifically, the sealing strip body is installed in the core structure of the plate-fin heat exchanger by having its left surface 4 and right surface 5 abut against the partition plates, with its upper surface 3 facing outwards. The specific structure is disclosed in the prior art documents and will not be elaborated upon here. Unlike existing technologies, this embodiment features an inlet section 1 with a recessed portion and an outlet section 2 with a protruding portion on the side facing the medium. When the medium enters the heat exchange core from the sealing head, it typically has a high initial velocity. Upon contact with the sealing strip body, the medium will decelerate. The medium with higher kinetic energy will impact the seal body. This impact force will directly act on the recessed part of the inlet section 1. The medium is guided to the bottom of the recessed part by the side wall of the recessed part, thereby reducing the impact on the weld at the connection between the seal body and the partition. Afterwards, the medium continues to flow along the extension direction of the seal body. The medium is slowed down by the friction generated by the continuous contact with the partition, fins and seal body. In this embodiment, the flow channel of the outlet section 2 is contracted by setting the protrusion, thereby increasing the flow rate and reducing the problem of medium retention at the outlet section 2 due to low flow rate.

[0024] The segmented sealing strip for plate-fin heat exchangers provided in Embodiment 1 of this utility model solves the problem that the sealing strips of plate-fin heat exchangers in the prior art are difficult to balance resistance to media impact and media retention. It can reduce the impact damage at the inlet and reduce the flow resistance at the outlet.

[0025] As a preferred embodiment, the recessed portion is symmetrical from left to right; the protruding portion is symmetrical from left to right; the recessed portion includes a first lower surface 11; the protruding portion includes a second lower surface 21; both the first lower surface 11 and the second lower surface 21 are planar; the first lower surface 11 and the left surface 4 are connected by an upwardly curved first arc surface 12; the first lower surface 11 and the right surface 5 are connected by an upwardly curved second arc surface 13; the second lower surface 21 and the left surface 4 are connected by a downwardly curved third arc surface 22; the second lower surface and the right surface 5 are connected by a downwardly curved fourth arc surface 23. Compared to the arc-shaped surface of the traditional concave structure, the first lower surface 11 of the planar structure allows the impact load of the high-speed fluid in the inlet section 1 to be more evenly distributed at the bottom of the concave part, avoiding excessive local stress caused by the impact concentrating at the apex of the arc-shaped surface; the left and right symmetrical design ensures that the fluid flows evenly on both sides of the inlet section 1, avoiding flow deviation or turbulence caused by structural asymmetry; the first arc surface 12 and the second arc surface 13 cause the fluid medium in contact with them to face away from the seal body and bounce in the direction close to the left surface 4 and the right surface 5, and the concave part guides the medium to the junction of the left surface 4 and the right surface 5 to impact the weld; compared to the arc-shaped surface of the traditional convex structure, the second lower surface 21 of the planar structure can provide a more stable flow channel curvature when the fluid velocity in the outlet section 2 decreases, and the third arc surface 22 and the fourth arc surface 23 can reduce the vortex zone caused by the sudden change in the cross-sectional area of ​​the flow channel, which is especially suitable for low-speed flow scenarios of high viscosity fluids (such as hot oil) and reduces the risk of stagnation.

[0026] In this embodiment, the curvature of the first arc surface 12, the second arc surface 13, the third arc surface 22, and the fourth arc surface 23 is less than π / 2 rad. The arc surface with a curvature of less than 90° (such as a 45°~60° arc) makes the transition between the lower surface and the side of the seal smoother, reduces the centrifugal force when the fluid changes direction, and affects the flow of the fluid toward the outlet of the heat exchange core.

[0027] As a preferred embodiment, in this embodiment, a through hole 6 is provided inside the seal body; the through hole 6 is provided along the elongated direction of the seal body; the through hole 6 penetrates the inlet section 1 and the outlet section 2. The through hole 6 can serve as a stress relief channel, reducing the internal stress generated by welding thermal deformation and cooling shrinkage, and lowering the risk of weld cracking; and the through hole 6 can absorb the deformation stress generated by the impact of the medium.

[0028] In this embodiment, the through hole 6 is rectangular; the long side of the through hole 6 is parallel to the upper surface 3 of the seal body; the shortest distance between the wide sides of the through hole 6 (that is, the length of the long side of the through hole 6) is 1 / 2 of the distance between the left surface 4 and the right surface 5 of the seal body. One-quarter width of solid material is retained on each side of the seal to prevent the wall thickness on both sides from becoming too thin due to an excessively large through hole, thereby ensuring the edge support strength of the seal for the partition.

[0029] In summary, this utility model provides a segmented sealing strip for plate-fin heat exchangers, relating to the field of heat exchangers. It includes a symmetrical, elongated sealing strip body, divided into an inlet section and an outlet section along the elongated direction. The outlet section extends after the inlet section. The upper, left, and right surfaces of the inlet and outlet sections are coplanar. The upper, left, and right surfaces are all planar. The upper surface is horizontal; the left and right surfaces are vertical. The lower side of the inlet section is a recess; the lower side of the outlet section is a protrusion. The inlet and outlet sections are connected by a circular arc surface at their junction. This segmented sealing strip for plate-fin heat exchangers solves the problem in the prior art where sealing strips for plate-fin heat exchangers struggle to simultaneously resist media impact and retain media, reducing impact damage at the inlet and flow resistance at the outlet.

[0030] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A segmented sealing strip for use in plate-fin heat exchangers, comprising symmetrically arranged elongated sealing strip bodies, characterized in that, The seal body is divided into an inlet section and an outlet section along the elongated extension direction; the outlet section extends after the inlet section; the upper, left, and right surfaces of the inlet and outlet sections are coplanar; the upper, left, and right surfaces are all planes; the upper surface is horizontal; the left and right surfaces are vertical. The lower side of the inlet section is a recessed portion; The lower side of the outlet section is a protrusion; The inlet section and the outlet section are connected by a circular arc surface at the junction.

2. The segmented sealing strip for plate-fin heat exchangers as described in claim 1, characterized in that, The recessed portion is symmetrical from left to right; the protruding portion is symmetrical from left to right; The recessed portion includes a first lower surface; the protruding portion includes a second lower surface; both the first lower surface and the second lower surface are planar. The first lower surface is connected to the left surface by a first arc surface that curves upward; the first lower surface is connected to the right surface by a second arc surface that curves upward. The second lower surface is connected to the left surface by a downwardly curved third arc surface; the second lower surface is connected to the right surface by a downwardly curved fourth arc surface.

3. The segmented sealing strip for plate-fin heat exchangers as described in claim 2, characterized in that, The radians of the first, second, third, and fourth arc surfaces are less than π / 2 rad.

4. The segmented sealing strip for plate-fin heat exchangers as described in claim 1, characterized in that, The seal body has a through hole inside; the through hole extends along the elongated direction of the seal body; the through hole passes through the inlet section and the outlet section.

5. The segmented sealing strip for plate-fin heat exchangers as described in claim 4, characterized in that, The through hole is rectangular; the long side of the through hole is parallel to the upper surface of the seal body; the shortest distance between the wide sides of the through hole is 1 / 2 of the distance between the left and right surfaces of the seal body.

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