Heat exchanger with polytetrafluoroethylene lining

Abstract

The invention relates to the technical field of corrosion-resistant heat exchange, and discloses a polytetrafluoroethylene lined heat exchanger which comprises a cylindrical shell, a water outlet and a water inlet are formed in the cylindrical shell, a soaking mechanism is sleeved with the water inlet, a top cover is connected to the upper surface of the cylindrical shell in a clamped mode, and a polytetrafluoroethylene lining is arranged on the top cover. A bottom cover is clamped to the lower surface of the cylindrical shell, a tube bundle is clamped to the interior of a top cover, a liquid level mechanism is fixedly connected to the interior of a water outlet, cooling water is evenly sprayed to the tube bundle through a flow dividing barrel and a water outlet ring, and the tube bundle is prevented from being damaged due to uneven temperature; the synchronous gear ring synchronizes multiple groups of limiting rotating shafts to push the tube plate to disperse a tube bundle bundling area, so that the problems of heat exchange space and flow are solved; the L-shaped pipe blocks water drainage of the water outlet, the cooling water level rises to be flush with the L-shaped pipe, and full contact of pipe bundles is guaranteed; the first rubber belt and the second rubber belt are matched with the water blocking assembly, separated drainage is pushed after the water level reaches the standard, and circulation and stable heat exchange are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of corrosion-resistant heat exchange technology, in particular to a polytetrafluoroethylene-lined heat exchanger. BACKGROUND

[0002] The development of the microelectronic, optoelectronic and photovoltaic industries has driven a surge in demand for wet electronic chemicals. Ordinary fluoroplastic heat exchangers are prone to secondary pollution caused by material impurities, structural defects leading to metal leaching, and process residual particles. The polytetrafluoroethylene-lined heat exchanger avoids pollution problems by using high-purity materials, stable combination structures and residue-free processes, and adapts to industry demand. Related technical standards have also gradually improved, making it a key device in this field.

[0003] Patent application No. CN201620132762.1 discloses a new type of heat exchanger made of soluble polytetrafluoroethylene, comprising a shell and a tube bundle arranged inside the shell. Tube sheets are arranged at both ends of the shell, and heads are arranged at the ends of the tube sheets away from the shell. The tube bundle is fixedly connected to the tube sheets at both ends. The tube sheets and the tube bundle are made of ultra-pure PFA. A PFA lining is arranged on the end face of the head facing the tube sheet. A fixed flange is sleeved on the outside of the tube sheet. The end face of the fixed flange facing the tube sheet is provided with a dovetail groove.

[0004] However, the existing polytetrafluoroethylene-lined heat exchanger has the following disadvantages: during cooling and heat exchange, the cooling water is often not distributed evenly, making it difficult to uniformly act on the tube bundle. The fluid flow in the tube bundle cluster area is limited, and there is a lack of effective liquid level control, leading to unstable cooling water level. This can cause some tube bundles to not fully contact the cooling water, resulting in low heat exchange efficiency and potential damage to the tube bundle due to temperature differences. To address this issue, a polytetrafluoroethylene-lined heat exchanger is proposed. SUMMARY

[0005] The present application aims to provide a polytetrafluoroethylene-lined heat exchanger to solve the problems mentioned in the background.

[0006] To solve the above technical problems, the present application provides the following technical solution: a polytetrafluoroethylene-lined heat exchanger, comprising a cylindrical shell, an outlet and an inlet are formed in the interior of the cylindrical shell, a heat equalizing mechanism is sleeved in the interior of the inlet, the heat equalizing mechanism comprises: A rotating box is provided, with a waterproof motor fixedly connected to its outer surface. A toothed shaft is fixedly connected to the output end of the waterproof motor. A transmission belt is rotatably connected to the outer surface of the toothed shaft. A limit shaft is rotatably connected inside the transmission belt. A threaded column is fixedly connected inside the limit shaft. A threaded collar is threadedly connected to the outer surface of the threaded column. A synchronization gear ring is engaged on the outer surface of the toothed shaft. The synchronization gear ring is used to synchronize multiple sets of toothed shafts.

[0007] According to the above technical solution, a top cover is snapped onto the upper surface of the cylindrical shell, a bottom cover is snapped onto the lower surface of the cylindrical shell, a tube bundle is snapped onto the inside of the top cover, and a liquid level mechanism is fixedly connected inside the water outlet. The top cover and the bottom cover are used to limit the movement of the tube bundle.

[0008] According to the above technical solution, the heat equalization mechanism further includes a flow guide pipe, which is sleeved with the water inlet. A flow divider is threadedly connected to the outer surface of the flow guide pipe. A water outlet ring is rotatably connected inside the flow divider. A tube sheet is rotatably connected to the outer surface of the threaded collar. A water passage hole is opened inside the tube sheet. A corrugated pipe is sleeved on the outer surface of the threaded column. A support surface is provided inside the cylindrical shell. The support surface is used to support the rotating box.

[0009] According to the above technical solution, the guide pipe is in contact with the inner wall of the outlet, the outer surface of the diverter cylinder is in contact with the inner wall of the cylindrical shell, the lower surface of the rotating box is in contact with the lower surface of the support surface, and the water outlet ring is used to uniformly discharge cooling water.

[0010] According to the above technical solution, the toothed rotating shaft and the limiting rotating shaft are both rotatably connected to the rotating box. The outer surface of the limiting rotating shaft is in contact with the outer surface of the transmission belt. The synchronous gear ring is rotatably connected to the rotating box. The width of the rotating box is the same as the width of the limiting rotating shaft. The tube plate is used to limit the tube bundle.

[0011] According to the above technical solution, the liquid level mechanism includes a support frame, which is fixedly connected to the inner wall of the outlet. An L-shaped tube is fixedly connected to the outer surface of the support frame. An arc-shaped rubber sleeve is slidably connected inside the L-shaped tube. A connecting rod is fixedly connected to the outer surface of the arc-shaped rubber sleeve. A support ring is fixedly connected to the outer surface of the connecting rod. A guide groove is opened inside the top cover for water to enter the L-shaped tube.

[0012] According to the above technical solution, the liquid level mechanism further includes a water-blocking circular plate, which is engaged with a connecting rod. A rubber belt is fixedly connected inside the water-blocking circular plate, and a water-blocking ring is fixedly connected to the outer surface of the rubber belt. A second rubber belt is fixedly connected inside the first water-blocking ring, and a second water-blocking ring is fixedly connected to the outer surface of the second rubber belt. A second support ring is engaged inside the outlet, and a limit frame is fixedly connected to the outer surface of the second support ring. A stop post is threaded inside the limit frame, and the connecting rod is used to limit the water-blocking circular plate.

[0013] According to the above technical solution, there is a gap between the L-shaped tube and the guide groove, the first support ring is slidably connected to the L-shaped tube, the outer surface of the second water-blocking ring is slidably connected to the inner wall of the outlet, the support frame coincides with the limiting frame, and the abutment is used to limit the water-blocking plate, the first water-blocking ring, and the second water-blocking ring.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. In this type of polytetrafluoroethylene-lined heat exchanger, when heat exchange is performed on the tube bundle, a water outlet ring is set up. When the cooling water enters from the outlet, it is first divided by the flow divider and then evenly discharged from the water outlet ring. The cooling water can be evenly sprayed on the surface of the tube bundle, ensuring uniform heat exchange and preventing the tube bundle from affecting each other due to its own low thermal conductivity and high expansion characteristics caused by uneven temperature.

[0015] 2. This type of PTFE-lined heat exchanger, by setting a synchronous gear ring, can synchronously drive multiple sets of limit shafts when the limiting shaft drives the threaded column to rotate. In turn, the threaded collar horizontally pushes the tube sheet, thereby dispersing the bundled area of ​​the tube bundle and avoiding uneven fluid flow in the bundled area due to limited heat exchange space.

[0016] 3. This type of polytetrafluoroethylene-lined heat exchanger, by setting up an L-shaped tube, when cooling water accumulates inside the cylindrical shell and the liquid level rises to the inside of the outlet, the L-shaped tube will block the drainage flow of the outlet, causing the liquid level to gradually rise until it is flush with the upper surface of the L-shaped tube. At this time, the cooling water can fully contact and act on the tube bundle inside the shell.

[0017] 4. This type of polytetrafluoroethylene-lined heat exchanger, by setting rubber belt one and rubber belt two, when the cooling water level is flush with the L-shaped tube, enters the L-shaped tube and pushes the water-blocking circular plate and water-blocking ring one, so that they come into contact with multiple sets of abutment columns, so that the water-blocking circular plate, water-blocking ring one and water-blocking ring two are separated from each other, and then the cooling water is discharged to achieve circulation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a cross-sectional view of the overall structure of the present invention; Figure 3 This is a cross-sectional view of the flow guide tube of the present invention; Figure 4 This is a cross-sectional view of the rotating box of the present invention; Figure 5 for Figure 4 Enlarged cross-sectional view of the structure at point A in the middle; Figure 6 This is a cross-sectional view of the liquid level mechanism of the present invention; Figure 7 This is a schematic diagram of the arc-shaped rubber sleeve of the present invention; Figure 8 This is a cross-sectional view of the water-blocking circular plate of the present invention.

[0019] In the diagram: 1. Cylindrical shell; 2. Outlet; 3. Inlet; 4. Tube bundle; 41. Top cover; 42. Bottom cover; 5. Heating mechanism; 51. Guide pipe; 511. Flow divider; 512. Outlet ring; 52. Rotating box; 521. Waterproof motor; 522. Toothed shaft; 523. Drive belt; 524. Limiting shaft; 525. Threaded column; 526. Threaded collar; 527. Synchronous gear ring; 53. Tube sheet; 5 31. Water passage hole; 532. Corrugated pipe; 54. Support surface; 6. Liquid level mechanism; 61. Support frame; 611. L-shaped pipe; 62. Arc-shaped rubber sleeve; 621. Connecting rod; 622. Support ring one; 63. Water-blocking circular plate; 631. Rubber belt one; 632. Water-blocking circular ring one; 633. Rubber belt two; 634. Water-blocking circular ring two; 64. Guide groove; 65. Support ring two; 651. Limiting frame; 652. Support column. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] Example 1: See Figures 1-5 The present invention provides a technical solution: a heat exchanger lined with polytetrafluoroethylene, comprising a cylindrical shell 1, wherein an outlet 2 and an inlet 3 are provided inside the cylindrical shell 1, and a heat equalization mechanism 5 is sleeved inside the inlet 3, the heat equalization mechanism 5 comprising: A rotating box 52 has a waterproof motor 521 fixedly connected to its outer surface. A toothed rotating shaft 522 is fixedly connected to the output end of the waterproof motor 521. A transmission belt 523 is rotatably connected to the outer surface of the toothed rotating shaft 522. A limit rotating shaft 524 is rotatably connected inside the transmission belt 523. A threaded post 525 is fixedly connected inside the limit rotating shaft 524. A threaded collar 526 is threadedly connected to the outer surface of the threaded post 525. A synchronous gear ring 527 is meshed on the outer surface of the toothed rotating shaft 522. The synchronous gear ring 527 is used to synchronize multiple sets of toothed rotating shafts 522.

[0024] A top cover 41 is snapped onto the upper surface of the cylindrical shell 1, and a bottom cover 42 is snapped onto the lower surface of the cylindrical shell 1. A tube bundle 4 is snapped onto the inside of the top cover 41, and a liquid level mechanism 6 is fixedly connected to the inside of the outlet 2. The top cover 41 and the bottom cover 42 are used to limit the movement of the tube bundle 4.

[0025] The heat equalization mechanism 5 also includes a guide pipe 51, which is sleeved with the water inlet 3. A diverter cylinder 511 is threadedly connected to the outer surface of the guide pipe 51. A water outlet ring 512 is rotatably connected inside the diverter cylinder 511. A tube sheet 53 is rotatably connected to the outer surface of the threaded collar 526. A water passage hole 531 is opened inside the tube sheet 53. A corrugated pipe 532 is sleeved on the outer surface of the threaded column 525. A support surface 54 is provided inside the cylindrical shell 1. The support surface 54 is used to support the rotating box 52.

[0026] The guide pipe 51 is in contact with the inner wall of the outlet 2, the outer surface of the diverter 511 is in contact with the inner wall of the cylindrical shell 1, the lower surface of the rotating box 52 is in contact with the lower surface of the support surface 54, and the water outlet ring 512 is used to uniformly discharge cooling water.

[0027] The toothed shaft 522 and the limiting shaft 524 are both rotatably connected to the rotating box 52. The outer surface of the limiting shaft 524 is in contact with the outer surface of the transmission belt 523. The synchronous gear ring 527 is rotatably connected to the rotating box 52. The width of the rotating box 52 is the same as the width of the limiting shaft 524. The tube sheet 53 is used to limit the tube bundle 4. When the tube sheet 53 is pushed by the threaded connection between the threaded column 525 and the threaded collar 526, the corrugated pipe 532 protects the threaded column 525 to prevent the cooling water from corroding the threaded column 525. When the toothed shaft 522 drives the threaded column 525 to rotate, the three sets of threaded columns 525 arranged synchronously and symmetrically by the synchronous gear ring 527 make the tube sheet 53 move horizontally outward. When the transmission belt 523 rotates the threaded column 525, the convex ring of the limiting shaft 524 limits the transmission belt 523.

[0028] When water enters through inlet 3, the cooling water is directly introduced into the interior of the cylindrical shell 1, which results in uneven heat conduction on both sides of the tube bundle 4 located at inlet 3. Furthermore, since the cooling water immersed in the clustered area of ​​tube bundle 4 is less than that in the outer tube bundle 4, the heat exchange is uneven. Therefore, the heat equalization mechanism 5 is required to uniformly discharge the cooling water from inlet 3 and disperse it in the clustered area of ​​tube bundle 4, so that the tube bundle 4 can undergo uniform heat exchange.

[0029] The working principle of this embodiment is as follows: When using this type of polytetrafluoroethylene-lined heat exchanger, the distribution cylinder 511 is pushed into the interior of the cylindrical shell 1, and the guide pipe 51 is threadedly connected to the distribution cylinder 511 to fix the distribution cylinder 511. At this time, the tube bundle 4 with the heat equalization mechanism 5 is placed inside the cylindrical shell 1, and the tube bundle 4 is fixed by the top cover 41 and the bottom cover 42. Cooling water is then introduced through the guide pipe 51 and diverted through the distribution cylinder 511, so that the cooling water is discharged through the outlet ring 512. This ensures uniform heat conduction to the tube bundle 4 on both sides of the inlet 3 section, and the water flows down... The upper surface of the bottom cover 42 accumulates inside the cylindrical shell 1. At this time, the waterproof motor 521 drives the toothed shaft 522 to rotate, and the transmission belt 523 drives the limiting shaft 524 to rotate, thereby causing the threaded column 525 to rotate. At this time, the threaded collar 526 is threadedly connected to the threaded column 525, which drives the tube sheet 53 to move outward, thereby dispersing the bundled area of ​​the tube bundle 4. At this time, the accumulated cooling water exchanges heat with the tube bundle 4, and more cooling water is introduced into part of the bundled area through the water passage 531, so that the bundled area of ​​the tube bundle 4 can undergo uniform heat exchange.

[0030] Example 2: Please refer to Figures 6-8Based on Embodiment 1, the present invention provides a technical solution: the liquid level mechanism 6 includes a support frame 61, the support frame 61 is fixedly connected to the inner wall of the outlet 2, an L-shaped tube 611 is fixedly connected to the outer surface of the support frame 61, an arc-shaped rubber sleeve 62 is slidably connected inside the L-shaped tube 611, a connecting rod 621 is fixedly connected to the outer surface of the arc-shaped rubber sleeve 62, a support ring 622 is fixedly connected to the outer surface of the connecting rod 621, and a guide groove 64 is opened inside the top cover 41 for water to enter the L-shaped tube 611.

[0031] The liquid level mechanism 6 also includes a water-blocking circular plate 63, which is engaged with the connecting rod 621. A rubber belt 631 is fixedly connected inside the water-blocking circular plate 63, and a water-blocking ring 632 is fixedly connected to the outer surface of the rubber belt 631. A rubber belt 633 is fixedly connected inside the water-blocking ring 632, and a water-blocking ring 634 is fixedly connected to the outer surface of the rubber belt 633. A support ring 65 is engaged inside the outlet 2, and a limit frame 651 is fixedly connected to the outer surface of the support ring 65. A stop post 652 is threaded inside the limit frame 651. The connecting rod 621 is used to limit the water-blocking circular plate 63.

[0032] There is a gap between the L-shaped tube 611 and the guide channel 64. The first support ring 622 is slidably connected to the L-shaped tube 611. The outer surface of the second water-blocking ring 634 is slidably connected to the inner wall of the outlet 2. The support frame 61 coincides with the limiting frame 651. The abutment 652 is used to limit the water-blocking plate 63, the first water-blocking ring 632, and the second water-blocking ring 634. When the liquid level rises guided by the L-shaped tube 611, the arc-shaped rubber sleeve 62 controls the water-blocking plate 63. The limit switch 652 abuts against the water-blocking ring 634, preventing the water-blocking plate 63 and the water-blocking ring 634 from moving. The position of the water-blocking ring 632 is fixed by the pulling of the rubber belt 631 and the rubber belt 633, thereby sealing the water outlet 2. When the arc-shaped rubber sleeve 62 is pushed, the water-blocking ring 632 can be pushed, separating the water-blocking plate 63, the water-blocking ring 632, and the water-blocking ring 634.

[0033] When the cylindrical shell 1 is set vertically, the liquid level inside is unstable, making it difficult to exchange heat with the tube bundle 4 located above the outlet 2. Therefore, the liquid level mechanism 6 is needed to control the liquid level so that the liquid level is flush with the upper surface of the L-shaped tube 611 to exchange heat with the tube bundle 4 inside the cylindrical shell 1.

[0034] The working principle of this embodiment is as follows: When using this type of polytetrafluoroethylene-lined heat exchanger, when the cooling water level is tangent to the bottom surface of the outlet 2, the L-shaped tube 611 ensures that the flow rate of water discharged from the outlet 2 is less than the flow rate of water entering the inlet 3. The abutment 652 blocks the water-blocking ring 634, and the arc-shaped rubber sleeve 62 limits the water-blocking plate 63. Thus, the rubber belts 631 and 633 pull the water-blocking ring 632, sealing the outlet 2 and causing the liquid level to gradually rise. When the liquid level is flush with the upper surface of the L-shaped tube 611, the cooling water is guided into the outlet through the guide groove 64. The water enters the interior of the L-shaped tube 611, thereby pushing the arc-shaped rubber sleeve 62 through the cooling water. Guided by the support ring 622, the water-blocking circular plate 63 moves towards the abutment 652. At the same time, the abutment 652 abuts against the water-blocking ring 634, and continuously pushes the water-blocking ring 632 and the water-blocking circular plate 63, causing the rubber band 633 and the rubber band 631 to be stretched. This causes the water-blocking ring 632, the water-blocking circular plate 63 to abut against the multiple sets of abutments 652, creating a gap between the water-blocking circular plate 63, the water-blocking ring 632, and the water-blocking ring 634, and guiding the cooling water out, thus circulating the cooling water.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A heat exchanger with polytetrafluoroethylene lining, comprising a cylindrical shell (1), the inside of the cylindrical shell (1) is provided with a water outlet (2) and a water inlet (3), the inside of the water inlet (3) is sleeved with a uniform heating mechanism (5), characterized in that, The heat equalizing mechanism (5) comprises: The outer surface of the rotating box (52) is fixedly connected with a waterproof motor (521), the output end of the waterproof motor (521) is fixedly connected with a toothed rotating shaft (522), the outer surface of the toothed rotating shaft (522) is rotatably connected with a transmission belt (523), the inside of the transmission belt (523) is rotatably connected with a limiting rotating shaft (524), the inside of the limiting rotating shaft (524) is fixedly connected with a threaded column (525), the outer surface of the threaded column (525) is threadedly connected with a threaded sleeve ring (526), the outer surface of the toothed rotating shaft (522) is engaged with a synchronous gear ring (527), and the synchronous gear ring (527) is used for synchronizing a plurality of groups of toothed rotating shafts (522).

2. A heat exchanger of the type defined in claim 1, characterised in that: The upper surface of the cylindrical shell (1) is clamped with a top cover (41), the lower surface of the cylindrical shell (1) is clamped with a bottom cover (42), the inside of the top cover (41) is clamped with a tube bundle (4), the inside of the water outlet (2) is fixedly connected with a liquid level mechanism (6), and the top cover (41) and the bottom cover (42) are used for limiting the tube bundle (4).

3. A heat exchanger of the type defined in claim 2, characterised in that: The heat equalizing mechanism (5) further comprises a flow guide pipe (51), the flow guide pipe (51) is sleeved with the water inlet (3), the outer surface of the flow guide pipe (51) is threadedly connected with a shunt cylinder (511), the inside of the shunt cylinder (511) is rotatably connected with a water outlet ring (512), the outer surface of the threaded sleeve ring (526) is rotatably connected with a tube plate (53), the inside of the tube plate (53) is provided with a water passing hole (531), the outer surface of the threaded column (525) is sleeved with a bellows (532), the inside of the cylindrical shell (1) is provided with a supporting surface (54), and the supporting surface (54) is used for supporting the rotating box (52).

4. A heat exchanger of the type defined in claim 3, characterised in that: The flow guide pipe (51) is in contact with the inner wall of the water outlet (2), the outer surface of the shunt cylinder (511) is in contact with the inner wall of the cylindrical shell (1), the lower surface of the rotating box (52) is in contact with the lower surface of the supporting surface (54), and the water outlet ring (512) is used for uniformly discharging cooling water.

5. A heat exchanger of the type defined in claim 4, characterised in that: The toothed rotating shaft (522) and the limiting rotating shaft (524) are rotatably connected with the rotating box (52), the outer surface of the limiting rotating shaft (524) is in contact with the outer surface of the transmission belt (523), the synchronous gear ring (527) is rotatably connected with the rotating box (52), the width of the rotating box (52) is the same as the width of the limiting rotating shaft (524), and the tube plate (53) is used for limiting the tube bundle (4).

6. A heat exchanger having a polytetrafluoroethylene lined tube as claimed in claim 3, wherein: The liquid level mechanism (6) comprises a support frame (61), the support frame (61) is fixedly connected with the inner wall of the water outlet (2), the outer surface of the support frame (61) is fixedly connected with an L-shaped pipe (611), the inside of the L-shaped pipe (611) is slidably connected with an arc surface rubber sleeve (62), the outer surface of the arc surface rubber sleeve (62) is fixedly connected with a connecting rod (621), the outer surface of the connecting rod (621) is fixedly connected with a support ring one (622), the inside of the top cover (41) is provided with a flow guide groove (64), and the flow guide groove (64) is used for water inlet of the L-shaped pipe (611).

7. A heat exchanger of the type defined in claim 6, characterised in that: The liquid level mechanism (6) further comprises a water blocking circular plate (63), the water blocking circular plate (63) is clamped with the connecting rod (621), the inside of the water blocking circular plate (63) is fixedly connected with a rubber belt one (631), the outer surface of the rubber belt one (631) is fixedly connected with a water blocking circular ring one (632), the inside of the water blocking circular ring one (632) is fixedly connected with a rubber belt two (633), the outer surface of the rubber belt two (633) is fixedly connected with a water blocking circular ring two (634), the inside of the water outlet (2) is clamped with a support ring two (65), the outer surface of the support ring two (65) is fixedly connected with a limiting frame (651), the inside of the limiting frame (651) is threadedly connected with a resisting column (652), and the connecting rod (621) is used for limiting the water blocking circular plate (63).

8. A heat exchanger of the type defined in claim 7, characterised in that: The L-shaped pipe (611) and the flow guide groove (64) have a spacing, the support ring one (622) is slidably connected with the L-shaped pipe (611), the outer surface of the water blocking circular ring two (634) is slidably connected with the inner wall of the water outlet (2), the support frame (61) coincides with the limiting frame (651), and the resisting column (652) is used for limiting the water blocking circular plate (63), the water blocking circular ring one (632) and the water blocking circular ring two (634).

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