A plate-type heat exchange device for seawater desalination

Abstract

The present invention relates to the technical field of plate heat exchange devices, specifically a plate heat exchange device for seawater desalination, comprising: a fixed pressing plate and a movable pressing plate, the surfaces of the fixed pressing plate and the movable pressing plate are both provided with through holes, a screw is movably inserted in the through holes, and a nut is rotatably connected to the rod body of the screw. A nut fixing sleeve is fixed on the surface of the fixed pressing plate, the nut of the screw is movably inserted in the nut fixing sleeve, a limiting groove is provided on the surface of the nut close to the movable pressing plate, and a limiting rod mounting groove is provided on the surface of the end of the movable pressing plate close to the nut; the beneficial effect is that when the nut needs to be removed, it is only necessary to fully retract the limiting rod mounting groove again to make the limiting rod withdraw from the limiting groove, thereby releasing the anti-loosening of the nut, so that when the nut is disassembled, the thread friction between the nut and the screw is not too large, thereby making the disassembly of the nut easier and reducing the wear between the threads.

Description

Technical Field

[0001] The present invention relates to the technical field of plate-type heat exchange devices, and in particular to a plate-type heat exchange device for seawater desalination. Background Art

[0002] Seawater desalination refers to the removal of salt from seawater to make it a source of water that can be directly drunk by people or used for agriculture, industry, etc. Seawater desalination can alleviate water shortages, promote sustainable economic development, and enhance water resource security. There are several methods of seawater desalination, such as distillation and reverse osmosis. Plate heat exchangers, also known as plate heat exchangers, are commonly used in seawater desalination. Plate heat exchangers are usually composed of fixed pressure plates, movable pressure plates and plates. The fixed pressure plates are provided with guide rods. The plates and movable pressure plates are The sliding connection is on the surface of the guide rod, and through holes are provided on the surfaces of the fixed pressing plate and the movable pressing plate. The screw is passed through the through holes provided on the surfaces of the fixed pressing plate and the movable pressing plate, and the nut is tightened on the screw, so that several groups of plates are pressed between the fixed pressing plate and the movable pressing plate. There are reserved lines on the surface of the plate, and the lines between the two groups of contacting plates form an interlaced flow structure. These interlaced flow structures make the hot and cold fluids in the plate heat exchanger produce strong turbulence and achieve efficient heat exchange effect.

[0003] In the prior art, since the surface temperature difference of the plate heat exchanger changes greatly during operation, the threads between the screw and the nut are affected by thermal expansion and contraction, and the friction between the threads sometimes decreases or even disappears. Usually, a metal gasket is set on the screw. The metal gasket has a certain elasticity. Therefore, after the nut is tightened, the metal gasket is in a compressed state. The elasticity of the metal gasket applies a clamping force to the threads between the nut and the screw, so that when the nut and the screw expand and contract due to thermal expansion and contraction, the threads can still fit tightly together to obtain a larger friction force, thereby realizing the anti-loosening function of the nut.

[0004] However, when the nut is disassembled, the nut anti-loosening method in the existing technology exerts a large compression force on the thread between the nut and the screw, which makes the friction between the threads too large, making it difficult to disassemble the nut, and also easily causes severe wear of the thread, resulting in thread slippage. Summary of the Invention

[0005] The object of the present invention is to provide a plate-type heat exchange device for seawater desalination to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: A plate-type heat exchange device for seawater desalination, comprising: a fixed pressing plate and a movable pressing plate, the surfaces of the fixed pressing plate and the movable pressing plate are provided with through holes, screws are movably inserted in the through holes, a nut is rotatably connected to the rod body of the screw, a nut fixing sleeve is fixed on the surface of the fixed pressing plate, the nut of the screw is movably inserted in the nut fixing sleeve, a limiting groove is provided on the surface of the nut close to the movable pressing plate, a limiting rod mounting groove is provided on the surface of the movable pressing plate close to the nut, one end of the limiting rod is movably inserted in the limiting rod mounting groove, and the other end of the limiting rod is movably inserted in the limiting groove.

[0007] Preferably, the limiting grooves are provided in a plurality of groups on the nut, and the plurality of limiting grooves are distributed in a circular pattern with the axis of the screw as the center line.

[0008] Preferably, the nut fixing sleeve is an annular cylindrical structure, and the inner ring of the nut fixing sleeve is the same shape and size as the nut of the screw.

[0009] Preferably, a connecting rod groove is provided inside the movable pressing plate, an operating rod mounting groove is provided on the surface of the movable pressing plate, the limiting rod mounting groove, the connecting rod groove and the operating rod mounting groove are connected, a connecting rod is slidably connected in the connecting rod groove, and an operating rod is movably inserted in the operating rod mounting groove, and the connecting rod and the operating rod are both rectangular rod body structures, one end of the connecting rod is fixed on the rod body of the limiting rod, and the other end of the connecting rod is fixed on the rod body of the operating rod.

[0010] Preferably, one end of the operating rod extends from the operating rod installation slot, the other end of the operating rod is fixed with a limit spring, and the other end of the limit spring is fixed on the inner wall of the operating rod installation slot.

[0011] Preferably, a guide groove is provided on the inner wall of the operating rod installation groove, and a guide rod is fixed to one end of the operating rod to fix the limit spring. The end of the guide rod away from the operating rod is movably inserted in the guide groove, and the limit spring is sleeved on the rod body of the guide rod.

[0012] Preferably, a pin hole is provided at one end of the operating rod extending out of the operating rod mounting slot, and the pin hole is a rectangular hole.

[0013] Preferably, a sleeve is fixed on the surface of the movable pressing plate, and one end of a pin is movably inserted on the surface of the sleeve. The pin is a rectangular rod structure, and the other end of the pin is movably inserted in the pin hole. A pin spring is fixed on the end of the pin extending into the sleeve, and the other end of the pin spring is fixed on the inner wall of the sleeve.

[0014] Preferably, a paddle window is provided on the surface of the end of the sleeve away from the movable pressing plate, in which a paddle is slidably connected. The paddle is a rectangular sheet structure, one end of the paddle is fixed on the surface of the latch, and the other end of the paddle extends from the paddle window.

[0015] Preferably, several groups of through holes are opened on the surface of the fixed pressure plate and the movable pressure plate, and the several groups of through holes are linearly distributed on the two symmetrical end faces of the fixed pressure plate and the movable pressure plate, and the positions of the through holes on the surface of the fixed pressure plate and the through holes on the surface of the movable pressure plate correspond to each other.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The plate-type heat exchange device for seawater desalination proposed by the present invention is as follows: after the screw is inserted into the through holes opened on the surfaces of the fixed pressing plate and the movable pressing plate, the nut of the screw is inserted into the nut fixing sleeve. Under the limiting action of the nut fixing sleeve, the screw can no longer rotate, and then the limiting rod is first completely retracted into the limiting rod installation groove, and then the nut is screwed on the screw. By tightening the nut, several groups of plates are pressed between the fixed pressing plate and the movable pressing plate. After the tightening is completed, the nut is slightly rotated to fine-tune the nut, so that the limiting rod installation groove is aligned with the nearest group of limiting grooves. After alignment, One end of the limit rod is inserted into the limit groove, and the other end of the limit rod stays in the limit rod installation groove. The nut is limited by the extrusion force between the limit groove, the limit rod installation groove and the limit rod, so that the nut cannot rotate, thereby achieving the anti-loosening function. At the same time, when the nut needs to be removed, it is only necessary to retract the limit rod completely into the limit rod installation groove again to make the limit rod withdraw from the limit groove, thereby releasing the anti-loosening of the nut, so that when the nut is disassembled, the thread friction between the nut and the screw will not be too large, thereby making the nut easier to disassemble and reducing the wear between the threads. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 for Figure 1 Enlarged schematic diagram of the structure at point A in the middle

[0020] Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention;

[0021] Figure 4 for Figure 3 A magnified schematic diagram of the structure at point B in the middle;

[0022] Figure 5 Schematic diagram of the cross-sectional structure of the sleeve;

[0023] Figure 6 for Figure 5 Enlarged schematic diagram of the structure at point C in the middle.

[0024] In the figure: fixed pressing plate 1, movable pressing plate 2, through hole 3, screw 4, nut 5, nut fixing sleeve 6, limit groove 7, limit rod mounting groove 8, limit rod 9, connecting rod groove 10, operating rod mounting groove 11, connecting rod 12, operating rod 13, limit spring 14, guide groove 15, guide rod 16, latch hole 17, latch 18, sleeve 19, latch spring 20, paddle window 21, paddle 22. DETAILED DESCRIPTION

[0025] In order to clearly and completely describe the objectives and technical solutions of the present invention and make the advantages more clearly understood, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, not all of them, and are only used to explain the embodiments of the present invention, not to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] Example 1: Please refer to Figures 1 to 6 The present invention provides a technical solution: a plate-type heat exchange device for seawater desalination, comprising: a fixed pressing plate 1 and a movable pressing plate 2, a through hole 3 is provided on the surface of the fixed pressing plate 1 and the movable pressing plate 2, a screw 4 is movably inserted in the through hole 3, a nut 5 is rotatably connected to the rod body of the screw 4, a nut fixing sleeve 6 is fixed on the surface of the fixed pressing plate 1, the nut of the screw 4 is movably inserted in the nut fixing sleeve 6, a limiting groove 7 is provided on the surface of the nut 5 near the end of the movable pressing plate 2, a limiting rod mounting groove 8 is provided on the surface of the movable pressing plate 2 near the nut 5, and a movably inserted screw rod 4 is provided in the through hole 3. One end of the limiting rod 9 is connected, and the other end of the limiting rod 9 is movably inserted in the limiting groove 7. Several groups of limiting grooves 7 are provided on the nut 5, and several groups of limiting grooves 7 are distributed in a circle with the axis of the screw 4 as the center line. The nut fixing sleeve 6 is an annular cylindrical structure. The inner ring of the nut fixing sleeve 6 has the same shape and size as the nut of the screw 4. Several groups of through holes 3 are opened on the surface of the fixed pressing plate 1 and the movable pressing plate 2. Several groups of through holes 3 are linearly distributed on the two symmetrical end faces of the fixed pressing plate 1 and the movable pressing plate 2, and the positions of the through holes 3 on the surface of the fixed pressing plate 1 and the through holes 3 on the surface of the movable pressing plate 2 correspond to each other.

[0027] In actual use, after the screw rod 4 is inserted into the through hole 3 opened on the surface of the fixed pressing plate 1 and the movable pressing plate 2, the nut of the screw rod 4 is inserted into the nut fixing sleeve 6. Under the limiting action of the nut fixing sleeve 6, the screw rod 4 can no longer rotate, and then the limiting rod 9 is completely retracted into the limiting rod mounting groove 8. Then the nut 5 is screwed on the screw 4. By tightening the nut 5, several groups of plates are pressed between the fixed pressing plate 1 and the movable pressing plate 2. After the tightening is completed, the nut 5 is slightly rotated to fine-tune the nut 5, so that the limiting rod mounting groove 8 is aligned with the nearest group of limiting grooves 7. After alignment, one end of the limiting rod 9 is aligned. Inserted into the limit groove 7, the other end of the limit rod 9 stays in the limit rod mounting groove 8, and the nut 5 is limited by the extrusion force between the limit groove 7, the limit rod mounting groove 8 and the limit rod 9, so that the nut 5 cannot rotate, thereby achieving the anti-loosening function. At the same time, when the nut 5 needs to be removed, it is only necessary to retract the limit rod 9 completely into the limit rod mounting groove 8 again to make the limit rod 9 withdraw from the limit groove 7, thereby releasing the anti-loosening of the nut 5, so that when the nut 5 is disassembled, the thread friction between the nut 5 and the screw 4 will not be too large, thereby making the disassembly of the nut 5 easier and reducing the wear between the threads.

[0028] Example 2: On the basis of Example 1, in order to realize the control of the movement of the limit rod 9, a connecting rod groove 10 is opened inside the movable pressing plate 2, and an operating rod mounting groove 11 is opened on the surface of the movable pressing plate 2. The limit rod mounting groove 8, the connecting rod groove 10 and the operating rod mounting groove 11 are connected. A connecting rod 12 is slidably connected in the connecting rod groove 10, and an operating rod 13 is movably inserted in the operating rod mounting groove 11. The connecting rod 12 and the operating rod 13 both have a rectangular rod structure, one end of the connecting rod 12 is fixed to the rod body of the limit rod 9, and the other end of the connecting rod 12 is fixed to the rod body of the operating rod 13. One end of the operating rod 13 extends out from the operating rod mounting groove 11, and the other end of the operating rod 13 is fixed with a limiting spring 14, and the other end of the limiting spring 14 is fixed to the inner wall of the slot body of the operating rod mounting groove 11.

[0029] When the limiting rod 9 needs to be fully retracted into the limiting rod installation groove 8, it is only necessary to fully press the operating rod 13 into the operating rod installation groove 11. The movement of the operating rod 13 drives the connecting rod 12 to move from one end of the connecting rod groove 10 to the other end, and the connecting rod 12 drives the limiting rod 9 to move in the same direction, so that the limiting rod 9 is fully retracted into the limiting rod installation groove 8; when the operating rod 13 is fully pressed into the operating rod installation groove 11, the limiting spring 14 is compressed;

[0030] Example 3: On the basis of Example 2, in order to prevent the limit spring 14 from invading the connecting rod groove 10 when it is compressed and thus hindering the movement of the connecting rod 12, a guide groove 15 is opened on the inner wall of the groove body of the operating rod mounting groove 11, and the end of the operating rod 13 that fixes the limit spring 14 is also fixed with a guide rod 16, and the end of the guide rod 16 away from the operating rod 13 is movably inserted in the guide groove 15, and the limit spring 14 is sleeved on the rod body of the guide rod 16.

[0031] When the operating rod 13 is pressed into the operating rod mounting groove 11, the guide rod 16 extends toward the guide groove 15, and the limit spring 14 is always sleeved on the rod body of the guide rod 16, so that the guide rod 16 guides the limit spring 14, so that the limit spring 14 can only be compressed along the movement direction of the guide rod 16 when compressed, and will not invade into the connecting rod groove 10 due to its own bending and affect the movement of the connecting rod 12, thereby preventing the limit spring 14 from invading into the connecting rod groove 10 when compressed, thereby hindering the movement of the connecting rod 12.

[0032] Embodiment 4: On the basis of embodiment 3, in order to achieve the goal of making the limit rod 9 continue to be fully retracted into the limit rod mounting groove 8, there is no need to press the operating rod 13 all the time, the end of the operating rod 13 extending out of the operating rod mounting groove 11 is provided with a latch hole 17, and the latch hole 17 is a rectangular hole. A sleeve 19 is fixed on the surface of the movable pressing plate 2, and one end of the latch 18 is movably inserted on the surface of the sleeve 19. The latch 18 is a rectangular rod body structure, and the other end of the latch 18 is movably inserted in the latch hole 17. The end of the latch 18 extending into the sleeve 19 is fixed with a latch spring 20, and the other end of the latch spring 20 is fixed on the inner wall of the sleeve 19. A pick window 21 is provided on the surface of the sleeve 19 away from the movable pressing plate 2, and a pick 22 is slidably connected in the pick window 21. The pick 22 is a rectangular sheet structure, one end of the pick 22 is fixed on the surface of the latch 18, and the other end of the pick 22 extends out from the pick window 21.

[0033] When tightening the nut 5, the limit rod 9 needs to be in the state of being fully retracted into the limit rod mounting groove 8 for a period of time, and the pick 22 is pushed from one end of the pick window 21 to the other end. The movement of the pick 22 drives the latch 18 to be fully retracted into the sleeve 19, so that the latch 18 is withdrawn from the latch hole 17, and then the operating rod 13 is fully pressed into the operating rod mounting groove 11, so that the limit rod 9 is fully retracted into the limit groove 7. When the latch 18 is fully retracted into the sleeve 19, the latch spring 20 is compressed. At this time, the pick 22 is released, and the latch spring 20 pushes one end of the latch 18 out of the sleeve 19 under its own elastic action, so that the rod body of the end of the latch 18 extending out of the sleeve 19 abuts against the end surface of the end of the operating rod 13 extending out of the limit spring 14, thereby continuously limiting the operating rod 13 in the limit spring 14 without the need to press the operating rod 13 all the time.

[0034] The fifth embodiment: On the basis of the fourth embodiment, in order to prevent the limit rod 9 from withdrawing from the limit groove 7 due to accidental touch when the nut 5 does not need to be disassembled, the operating rod 13 is extended out of the operating rod mounting slot 11. One end of the operating rod 13 is provided with a latch hole 17, and the latch hole 17 is a rectangular hole. A sleeve 19 is fixed on the surface of the movable pressure plate 2, and one end of the latch 18 is movably inserted on the surface of the sleeve 19. The other end of the latch 18 is movably inserted in the latch hole 17, and the end of the latch 18 extending into the sleeve 19 is fixed with a latch spring 20. The other end of the latch spring 20 is fixed on the inner wall of the sleeve 19. A pick window 21 is provided on the surface of the sleeve 19 away from the movable pressure plate 2. A pick 22 is slidably connected in the pick window 21. The pick 22 is a rectangular sheet structure, one end of the pick 22 is fixed on the surface of the latch 18, and the other end of the pick 22 extends out from the pick window 21.

[0035] When the nut 5 is tightened on the screw rod 4, the paddle 22 is moved to make the latch 18 completely retracted into the sleeve 19, and then the nut 5 is fine-tuned to make one end of the limit rod 9 insert into the nearest set of limit grooves 7. At this time, one end of the operating rod 13 also extends out of the operating rod mounting groove 11 again, and then the paddle 22 is released, so that the latch spring 20 pushes one end of the latch 18 out of the sleeve 19 again and inserts it into the latch hole 17. The latch hole 17 is limited by the latch 18, so that the operating rod 13 can no longer be completely retracted into the limit spring 14, thus achieving the purpose of preventing the limit rod 9 from withdrawing from the limit groove 7 due to accidental touch or other reasons when the nut 5 does not need to be disassembled.

[0036] In actual use, after the screw rod 4 is inserted into the through hole 3 opened on the surface of the fixed pressing plate 1 and the movable pressing plate 2, the nut of the screw rod 4 is inserted into the nut fixing sleeve 6. Under the limiting action of the nut fixing sleeve 6, the screw rod 4 can no longer rotate, and then the limiting rod 9 is completely retracted into the limiting rod mounting groove 8, and then the nut 5 is screwed on the screw rod 4. By tightening the nut 5, several groups of plates are pressed between the fixed pressing plate 1 and the movable pressing plate 2. After the tightening is completed, the nut 5 is slightly rotated to fine-tune the nut 5, so that the limiting rod mounting groove 8 is aligned with the nearest group of limiting grooves 7. After alignment, one end of the limiting rod 9 is inserted into the limiting groove 7, and the other end of the limiting rod 9 is inserted into the limiting groove 7. When the nut 5 needs to be removed, the limiting rod 9 only needs to be fully retracted into the limiting rod mounting groove 8 again to make the limiting rod 9 withdraw from the limiting groove 7, thereby releasing the anti-loosening of the nut 5, so that when the nut 5 is disassembled, the thread friction between the nut 5 and the screw rod 4 is not too large, thereby making the disassembly of the nut 5 easier and reducing the wear between the threads; when the limiting rod 9 needs to be fully retracted into the limiting rod mounting groove 8, it is only necessary to fully press the operating rod 13 When the operating rod 13 is fully pressed into the operating rod mounting groove 11, the movement of the operating rod 13 drives the connecting rod 12 to move from one end of the connecting rod groove 10 to the other end, and the connecting rod 12 drives the limiting rod 9 to move in the same direction, so that the limiting rod 9 is completely retracted into the limiting rod mounting groove 8; when the operating rod 13 is fully pressed into the operating rod mounting groove 11, the limiting spring 14 is compressed; therefore, when one end of the limiting rod 9 needs to be inserted into the limiting groove 7, it is only necessary to loosen the operating rod 13 after the nut 5 is tightened on the screw 4, and the elasticity of the limiting spring 14 generates a thrust for the operating rod 13 to extend out of the operating rod mounting groove 11. This thrust is transmitted to the limiting rod mounting groove 8 through the connecting rod 12, so when the nut 5 is fine-tuned to make the limiting After the rod mounting groove 8 is aligned with the nearest set of limit grooves 7, this thrust can push one end of the limit rod mounting groove 8 into the limit groove 7; when the operating rod 13 is pressed into the operating rod mounting groove 11, the guide rod 16 extends toward the guide groove 15, and the limit spring 14 is always sleeved on the rod body of the guide rod 16, so that the guide rod 16 plays a guiding role for the limit spring 14, so that the limit spring 14 can only be compressed along the movement direction of the guide rod 16 when compressed, and will not invade into the connecting rod groove 10 due to its own bending and affect the movement of the connecting rod 12, thereby preventing the limit spring 14 from invading into the connecting rod groove 10 when compressed, thereby hindering the movement of the connecting rod 12;When tightening the nut 5, the limit rod 9 needs to be in the state of being completely retracted into the limit rod mounting groove 8 for a period of time, and the pick 22 is toggled from one end of the pick window 21 to the other end. The movement of the pick 22 drives the latch 18 to be completely retracted into the sleeve 19, so that the latch 18 is withdrawn from the latch hole 17, and then the operating rod 13 is fully pressed into the operating rod mounting groove 11, so that the limit rod 9 is completely retracted into the limit groove 7. When the latch 18 is completely retracted into the sleeve 19, the latch spring 20 is compressed. At this time, the pick 22 is released, and the latch spring 20 pushes one end of the latch 18 out of the sleeve 19 under its own elastic action, so that the rod body of the end of the latch 18 extending out of the sleeve 19 abuts against the end surface of the end of the operating rod 13 extending out of the limit spring 14, thereby The operating rod 13 is continuously restrained in the limit spring 14 without the need to constantly press the operating rod 13. When the nut 5 is tightened on the screw rod 4, the paddle 22 is moved to completely retract the latch 18 into the sleeve 19. The nut 5 is then fine-tuned to insert one end of the limit rod 9 into the nearest set of limit slots 7. At this time, one end of the operating rod 13 also extends out of the operating rod mounting slot 11. The paddle 22 is then released, causing the latch spring 20 to push one end of the latch 18 out of the sleeve 19 again and insert it into the latch hole 17. The latch hole 17 is restrained by the latch 18, so that the operating rod 13 cannot be completely retracted into the limit spring 14. This achieves the purpose of preventing the limit rod 9 from withdrawing from the limit slot 7 due to accidental touch or other reasons when the nut 5 does not need to be disassembled.

[0037] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A plate-type heat exchange device for seawater desalination, comprising: A fixed pressing plate (1) and a movable pressing plate (2), a through hole (3) is provided on the surface of the fixed pressing plate (1) and the movable pressing plate (2), a screw rod (4) is movably inserted in the through hole (3), a nut (5) is rotatably connected to the rod body of the screw rod (4), and the characteristic is that a nut fixing sleeve (6) is fixed on the surface of the fixed pressing plate (1), the nut of the screw rod (4) is movably inserted in the nut fixing sleeve (6), a limiting groove (7) is provided on the surface of one end of the nut (5) close to the movable pressing plate (2), a limiting rod mounting groove (8) is provided on the surface of one end of the movable pressing plate (2) close to the nut (5), one end of the limiting rod (9) is movably inserted in the limiting rod mounting groove (8), and the other end of the limiting rod (9) is movably inserted in the limiting groove (7); A connecting rod groove (10) is provided inside the movable pressing plate (2), and an operating rod mounting groove (11) is provided on the surface of the movable pressing plate (2). The limiting rod mounting groove (8), the connecting rod groove (10) and the operating rod mounting groove (11) are connected to each other. A connecting rod (12) is slidably connected in the connecting rod groove (10), and an operating rod (13) is movably inserted in the operating rod mounting groove (11). Both the connecting rod (12) and the operating rod (13) are rectangular rod structures. One end of the connecting rod (12) is fixed to the rod body of the limiting rod (9), and the other end of the connecting rod (12) is fixed to the rod body of the operating rod (13). One end of the operating rod (13) extending out of the operating rod mounting slot (11) is provided with a latch hole (17), and the latch hole (17) is a rectangular hole; A sleeve (19) is fixed on the surface of the movable pressing plate (2), and one end of a latch (18) is movably inserted on the surface of the sleeve (19). The latch (18) is a rectangular rod structure, and the other end of the latch (18) is movably inserted in the latch hole (17). One end of the latch (18) extending into the sleeve (19) is fixed with a latch spring (20), and the other end of the latch spring (20) is fixed on the inner wall of the sleeve (19).

2. The plate-type heat exchange device for seawater desalination according to claim 1, characterized in that: The limiting grooves (7) are provided in a plurality of groups on the nut (5), and the plurality of groups of limiting grooves (7) are distributed in a circular pattern with the axis of the screw rod (4) as the center line.

3. The plate-type heat exchange device for seawater desalination according to claim 1, characterized in that: The nut fixing sleeve (6) is an annular cylindrical structure, and the inner ring of the nut fixing sleeve (6) is the same shape and size as the nut of the screw rod (4).

4. The plate-type heat exchange device for seawater desalination according to claim 1, characterized in that: One end of the operating rod (13) extends from the operating rod mounting groove (11), and the other end of the operating rod (13) is fixed to a limit spring (14), and the other end of the limit spring (14) is fixed to the inner wall of the operating rod mounting groove (11).

5. The plate-type heat exchange device for seawater desalination according to claim 4, characterized in that: A guide groove (15) is provided on the inner wall of the operating rod mounting groove (11), and a guide rod (16) is fixed to one end of the operating rod (13) to which the limit spring (14) is fixed. The end of the guide rod (16) away from the operating rod (13) is movably inserted into the guide groove (15), and the limit spring (14) is sleeved on the rod body of the guide rod (16).

6. The plate-type heat exchange device for seawater desalination according to claim 1, characterized in that: A paddle window (21) is provided on the surface of one end of the sleeve (19) away from the movable pressing plate (2), and a paddle (22) is slidably connected in the paddle window (21). The paddle (22) is a rectangular sheet structure, one end of the paddle (22) is fixed on the surface of the latch (18), and the other end of the paddle (22) extends out of the paddle window (21).

7. The plate-type heat exchange device for seawater desalination according to claim 1, characterized in that: The through holes (3) are provided in a plurality of groups on the surfaces of the fixed pressing plate (1) and the movable pressing plate (2). The plurality of through holes (3) are linearly distributed on the two symmetrical end faces of the fixed pressing plate (1) and the movable pressing plate (2), and the positions of the through holes (3) on the surface of the fixed pressing plate (1) and the through holes (3) on the surface of the movable pressing plate (2) correspond to each other.

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