A plate heat exchanger

Abstract

This utility model relates to the field of heat exchanger technology, and discloses a plate heat exchanger, including a frame, a positioning rod assembly, a pressure plate, a guide rod, a locking mechanism, multiple bolts, and multiple heat exchange plates, all extending vertically. The positioning rod assembly is disposed on the frame, and all the heat exchange plates are disposed on the positioning rod assembly. The positioning rod assembly is used to guide the heat exchange plates to limit the stacking of all heat exchange plates in the left-right direction. The frame is provided with guide holes extending in the left-right direction, through which the guide rod passes. The locking mechanism is disposed on the frame and is used to clamp or release the guide rod. The pressure plate is fixed to one end of the guide rod, and the bolts lock the frame and the pressure plate, so that the pressure plate presses all the stacked heat exchange plates onto the frame.

Description

Technical Field

[0001] This utility model relates to the field of heat exchangers, and more particularly to a plate heat exchanger. Background Technology

[0002] Traditional plate heat exchangers consist of multiple stacked heat exchange plates fastened together with bolts. Their high-efficiency heat exchange performance relies on the counter-current flow of hot and cold fluids, maximizing the temperature difference to improve heat transfer efficiency. When arranged vertically, the fluid enters from the corner holes at the top of the plates and flows naturally downwards under gravity, facilitating counter-current arrangement (such as hot fluid from top to bottom and cold fluid from bottom to top), thereby optimizing the heat exchange effect.

[0003] However, vertically stacked heat exchange plates require clamping to secure them. Current technology commonly uses bolts and pressure plates to lock the heat exchange plates to the frame, but this presents two problems: first, vertically arranged heat exchange plates are prone to tilting during installation; second, to accommodate different numbers of plates, the bolts are designed to be long, requiring more turns to tighten, thus prolonging the tightening operation time. These two factors combined make it difficult to accurately position the plates in a short time, necessitating the cooperation of multiple fitters for installation, severely impacting production assembly efficiency. Utility Model Content

[0004] The technical problem to be solved by this utility model is to solve at least one of the technical problems mentioned above.

[0005] The solution to the technical problem of this utility model is: A plate heat exchanger includes a frame, a positioning rod assembly, a pressure plate, a guide rod, a locking mechanism, multiple bolts, and multiple heat exchange plates, all extending vertically. The positioning rod assembly is mounted on the frame, and all the heat exchange plates are mounted on the positioning rod assembly. The positioning rod assembly guides the heat exchange plates to limit their stacking in the left-right direction. The frame has guide holes extending in the left-right direction, through which the guide rods pass. The locking mechanism is mounted on the frame and clamps or releases the guide rods. The pressure plate is fixed to one end of the guide rods. The bolts lock the frame and the pressure plate, causing the pressure plate to press all the stacked heat exchange plates onto the frame.

[0006] As a further improvement to the above technical solution, the positioning rod assembly includes an upper positioning rod and a lower positioning rod, which are respectively disposed on the frame. The upper positioning rod is disposed above the lower positioning rod. An upper positioning hole and a lower positioning hole are provided on the heat exchange plate. The upper positioning rod passes through the upper positioning hole, and the lower positioning rod passes through the lower positioning hole.

[0007] As a further improvement to the above technical solution, the upper positioning hole extends upward to the upper side of the heat exchange plate, so that the upper side of the heat exchange plate forms an upper opening that communicates with the upper positioning hole, and the lower positioning hole extends downward to the lower side of the heat exchange plate, so that the lower side of the heat exchange plate forms a lower opening that communicates with the lower positioning hole.

[0008] As a further improvement to the above technical solution, the frame includes a left fixed plate and a right column. The right column is located on the right side of the left fixed plate. The pressure plate is located between the left fixed plate and the right column. All the heat exchange plates are located between the pressure plate and the left fixed plate. The right column and the left fixed plate are connected by the upper positioning rod and the lower positioning rod.

[0009] As a further improvement to the above technical solution, the left fixing plate is provided with a first locking hole and a second locking hole, and the right column is provided with a third locking hole and a fourth locking hole. The upper positioning rod is inserted into the first locking hole and the third locking hole. The upper positioning rod includes an upper rod body and two upper nuts, and the lower positioning rod includes a lower rod body and two lower nuts. Both ends of the upper rod body extend with upper threaded sections, the diameter of which is smaller than the diameter of the upper rod body, thus forming an upper step on the upper rod body. Both ends of the lower rod body extend with lower threaded sections, the diameter of which is smaller than the diameter of the lower rod body, thus forming an upper step on the upper rod body. A lower step is formed on the rod body. Two lower threaded segments are respectively inserted into the second locking hole and the fourth locking hole. The two lower steps abut against the left fixing plate and the right column respectively. The two lower nuts and the lower threaded segments are threadedly engaged. The two lower nuts are used to clamp the left fixing plate and the right column. Two upper threaded segments are respectively inserted into the first locking hole and the third locking hole. The two upper steps abut against the left fixing plate and the right column respectively. The two upper nuts and the upper threaded segments are threadedly engaged. The two upper nuts are used to clamp the left fixing plate and the right column.

[0010] As a further improvement to the above technical solution, the pressure plate is provided with an upper clearance hole and a lower clearance hole, and the upper positioning rod and the lower positioning rod pass through the upper clearance hole and the lower clearance hole respectively in a one-to-one correspondence.

[0011] As a further improvement to the above technical solution, the upper clearance hole extends upward to the upper side of the pressure plate, and the lower clearance hole extends downward to the lower side of the pressure plate.

[0012] As a further improvement to the above technical solution, the locking mechanism includes a sleeve and multiple jaws. All the jaws are made of elastic material and are fixedly connected to the sleeve. The sleeve is provided with external threads, and the guide hole is provided with internal threads. The external threads and internal threads are connected in a mating manner. The guide rod passes through the sleeve, and the guide hole is provided with a guide cone surface. The guide cone surface is used to abut against the jaws, causing the jaws to retract and clamp the guide rod.

[0013] As a further improvement to the above technical solution, a chamfer is provided on the outer side of each gripper near the guide cone surface.

[0014] As a further improvement to the above technical solution, all the grippers are arranged in a circumferential array around the axis of the sleeve.

[0015] The beneficial effects of this utility model are as follows: When installing heat exchange plates, multiple vertically arranged heat exchange plates, arranged in a left-right direction, can be first installed onto the positioning rod assembly. Then, the operator uses a pressure plate to pre-press these horizontally stacked heat exchange plates and locks the guide rods using a locking mechanism, achieving rapid pre-locking of the guide rods. At this point, the bolts are tightened sequentially, causing the nuts on the bolts to press against the pressure plate. Finally, the locking mechanism is loosened, and the bolts are further tightened to press the heat exchange plate assembly onto the frame. This utility model optimizes the assembly process of traditional bolt fastening methods through the setting of the positioning rod assembly, guide rods, and locking mechanism. The positioning rod assembly restricts the heat exchange plates from stacking in the left-right direction, preventing tilting during installation; the guide rods pass through the guide holes in the frame and, in conjunction with the locking mechanism, achieve rapid initial positioning. First, the guide rods and pressure plates are temporarily fixed using the locking mechanism to complete the initial pressing of the heat exchange plates; then, the bolts are tightened to achieve final locking, and the pressure of the pressure plate can be further adjusted after loosening the locking mechanism. The positioning rod assembly prevents the heat exchange plate from tilting and reduces alignment adjustment time; the locking mechanism enables quick initial fixing and effectively reduces the possibility of the heat exchange plate tilting during the tightening of bolts in traditional technologies. Attached Figure Description

[0016] Figure 1 This utility model relates to the isometric plate heat exchanger. Figure 1 .

[0017] Figure 2 This utility model relates to the isometric plate heat exchanger. Figure 2 .

[0018] Figure 3 This is a cross-sectional schematic diagram of the locking mechanism and guide rod of this utility model.

[0019] The reference numerals in the attached drawings are as follows: 1-frame, 12-left fixed plate, 13-right column, 2-pressure plate, 3-guide rod, 41-gripper, 42-sleeve, 43-knob, 44-guide cone surface, 5-bolt, 61-upper positioning rod, 611-upper rod body, 612-upper nut, 613-upper threaded section, 62-lower positioning rod, 621-lower rod body, 622-lower nut, 623-lower threaded section, 7-heat exchange plate, 71-upper opening, 72-lower opening, 81-upper clearance hole, 82-lower clearance hole. Detailed Implementation

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments have been briefly explained above. Obviously, the described drawings are only a part of the embodiments of this utility model, not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0021] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages mentioned herein do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.

[0022] Traditional plate heat exchangers consist of multiple stacked heat exchange plates 7 fastened together with bolts 5. Their high-efficiency heat exchange performance relies on the counter-current flow of hot and cold fluids, maximizing the temperature difference to improve heat transfer efficiency. When arranged vertically, the fluid enters from the corner holes at the top of the plates and flows naturally downwards under gravity, facilitating counter-current arrangement (such as hot fluid from top to bottom and cold fluid from bottom to top), thereby optimizing the heat exchange effect.

[0023] However, the vertical heat exchange plates 7, after being stacked horizontally, need to be fixed by a clamping structure. Existing technology generally uses bolts 5 and pressure plates 2 to lock the heat exchange plates 7 to the frame 1, but this has two problems: first, the vertically arranged heat exchange plates 7 are prone to tilting during installation; second, to accommodate different numbers of plates, the bolts 5 are designed to be relatively long, requiring more turns to tighten, thus prolonging the locking operation time. These two factors combined make it difficult to accurately position the plates in a short time, requiring multiple fitters to work together for installation, severely impacting production assembly efficiency.

[0024] like Figures 1 to 3 As shown, this utility model provides a plate heat exchanger, which includes a frame 1, a positioning rod assembly, a pressure plate 2, a guide rod 3, a locking mechanism, multiple bolts 5, and multiple heat exchange plates 7, all extending vertically. The positioning rod assembly is mounted on the frame 1, and all the heat exchange plates 7 are mounted on the positioning rod assembly. The positioning rod assembly is used to guide the heat exchange plates 7 to limit the stacking of all the heat exchange plates 7 in the left-right direction. The frame 1 is provided with guide holes extending in the left-right direction, and the guide rod 3 passes through the guide holes. The locking mechanism is mounted on the frame 1 and is used to clamp or release the guide rod 3. The pressure plate 2 is fixed to one end of the guide rod 3. The bolts 5 lock the frame 1 and the pressure plate 2, so that the pressure plate 2 presses all the stacked heat exchange plates 7 onto the frame 1.

[0025] As can be seen, when installing the heat exchange plates 7, multiple vertically arranged heat exchange plates 7 can be first installed onto the positioning rod assembly. Then, the operator uses the pressure plate 2 to pre-press these horizontally stacked heat exchange plates 7, and locks the guide rod 3 through the locking mechanism to achieve rapid pre-locking of the guide rod 3. At this point, the bolts 5 are tightened sequentially, so that the nuts on the bolts 5 press against the pressure plate 2. Finally, the locking mechanism is loosened, and the bolts 5 are further tightened to press the heat exchange plate 7 assembly onto the frame 1.

[0026] This invention optimizes the assembly process of the traditional bolt 5 fastening method by setting up a positioning rod assembly, a guide rod 3, and a locking mechanism. The positioning rod assembly restricts the heat exchange plates 7 from stacking in the left-right direction, preventing them from tilting during installation; the guide rod 3 passes through the guide hole of the frame 1 and works with the locking mechanism to achieve rapid initial positioning. First, the guide rod 3 and the pressure plate 2 are temporarily fixed by the locking mechanism to complete the initial pressing of the heat exchange plates 7; then the bolt 5 is tightened to achieve final locking, and the pressure of the pressure plate 2 can be further adjusted after the locking mechanism is loosened. The positioning rod assembly prevents the heat exchange plates 7 from tilting, reducing the alignment adjustment time; the locking mechanism achieves rapid initial fixing, effectively reducing the possibility of the heat exchange plates 7 tilting during the tightening of the bolt 5 in the traditional technology.

[0027] In one embodiment, the positioning rod assembly includes an upper positioning rod 61 and a lower positioning rod 62, which are respectively mounted on the frame 1. The upper positioning rod 61 is positioned above the lower positioning rod 62. The heat exchange plate 7 has an upper positioning hole and a lower positioning hole. The upper positioning rod 61 passes through the upper positioning hole, and the lower positioning rod 62 passes through the lower positioning hole. Both the upper positioning rod 61 and the lower positioning rod 62 extend in the left-right direction. The heat exchange plate 7 is fitted onto the positioning rod through the upper and lower positioning holes, forming a stacking guide in the left-right direction. The positioning rods extending left and right pass through the positioning holes of the heat exchange plate 7, forcing the heat exchange plate 7 to align along the axis of the positioning rod (left-right direction) and limiting its offset in the front-back and up-down directions. The upper positioning rod 61 and the lower positioning rod 62 act as rigid guide rails, guiding multiple heat exchange plates 7 to be stacked sequentially in the left-right direction, ensuring that the corner holes, flow channels, and other structures of each heat exchange plate 7 are aligned.

[0028] In one embodiment, the upper positioning hole extends upward to the upper side of the heat exchange plate 7, forming an upper opening 71 on the upper side of the heat exchange plate 7 that communicates with the upper positioning hole. The lower positioning hole extends downward to the lower side of the heat exchange plate 7, forming a lower opening 72 on the lower side of the heat exchange plate 7 that communicates with the lower positioning hole. The corresponding upper opening 71 and lower opening 72 at the upper and lower positioning holes optimize the assembly method of the positioning rod and the heat exchange plate 7. The upper opening 71 of the upper positioning hole allows the heat exchange plate 7 to be vertically inserted into the upper positioning rod 61 from above, and the lower opening 72 of the lower positioning hole allows the heat exchange plate 7 to be vertically inserted into the lower positioning rod 62 from below, without needing to insert it along the axial (left-right) direction of the upper positioning rod 61 and lower positioning rod 62. The upper opening 71 and the lower opening 72, together with the left and right extension directions of the upper positioning rod 61 and the lower positioning rod 62, allow the heat exchange plate 7 to be directly "snapped" into the upper positioning rod 61 and the lower positioning rod 62 in the up and down direction, avoiding the cumbersome steps of precisely aligning the rod ends in the traditional openless design.

[0029] In one embodiment, the frame 1 includes a left fixed plate 12 and a right column 13. The right column 13 is located on the right side of the left fixed plate 12. The pressure plate 2 is located between the left fixed plate 12 and the right column 13. All the heat exchange plates 7 are located between the pressure plate 2 and the left fixed plate 12. The right column 13 and the left fixed plate 12 are connected by an upper positioning rod 61 and a lower positioning rod 62. The left fixed plate 12 and the right column 13 serve as rigid supports on both sides of the frame 1, respectively. They are laterally connected by the upper positioning rod 61 and the lower positioning rod 62 to form a stable "left and right frame," providing a rigid reference for the stacking of the heat exchange plates 7.

[0030] In one embodiment, the left fixing plate 12 has a first locking hole and a second locking hole, and the right column 13 has a third locking hole and a fourth locking hole. The upper positioning rod 61 is inserted into the first locking hole and the third locking hole. The upper positioning rod 61 includes an upper rod body 611 and two upper nuts 612, and the lower positioning rod 62 includes a lower rod body 621 and two lower nuts 622. Both ends of the upper rod body 611 extend into upper threaded sections 613, the diameter of which is smaller than the diameter of the upper rod body 611, forming an upper step on the upper rod body 611. Both ends of the lower rod body 621 extend into lower threaded sections 623, the diameter of which is smaller than the diameter of the lower rod body 621, forming an upper step on the lower rod body 611. A lower step is formed on the rod body 621. Two lower threaded sections 623 are respectively inserted into the second locking hole and the fourth locking hole. The two lower steps abut against the left fixing plate 12 and the right column 13 respectively. The two lower nuts 622 and the lower threaded sections 623 are threadedly engaged. The two lower nuts 622 are used to clamp the left fixing plate 12 and the right column 13. Two upper threaded sections 613 are respectively inserted into the first locking hole and the third locking hole. The two upper steps abut against the left fixing plate 12 and the right column 13 respectively. The two upper nuts 612 and the upper threaded sections 613 are threadedly engaged. The two upper nuts 612 are used to clamp the left fixing plate 12 and the right column 13.

[0031] The diameters of the threaded sections at both ends of the upper rod 611 and the lower rod 621 are smaller than the corresponding diameters of the upper rod 611 and the lower rod 621, forming corresponding annular "upper steps" and "lower steps". When the positioning rod is inserted into the locking holes of the left fixed plate 12 and the right column 13, the step surfaces of the upper and lower steps are tightly abutted against the sides of the left fixed plate 12 and the right column 13, restricting the movement of the left fixed plate 12 and the right column 13 in the left and right directions, and ensuring the stability of the lateral dimension of the frame 1. After the upper threaded section 613 passes through the upper locking hole and the lower threaded section 623 passes through the lower locking hole, the upper nuts 612 and the lower nuts 622 at both ends of the corresponding upper rod 611 and lower rod 621 are tightened to clamp the left fixing plate 12 and the right column 13 between the step surface and the corresponding upper nut 612, the step surface and the corresponding lower nut 622, forming a detachable rigid connection, so that the lower positioning rod 62, the upper positioning rod 61, the left fixing plate 12 and the right column 13 constitute an integral structure.

[0032] In one embodiment, the pressure plate 2 has an upper clearance hole 81 and a lower clearance hole 82, and the upper positioning rod 61 and the lower positioning rod 62 pass through the upper clearance hole 81 and the lower clearance hole 82 respectively. The upper clearance hole 81 and the lower clearance hole 82 are respectively clearance-fitted with the upper positioning rod 61 and the lower positioning rod 62, allowing the pressure plate 2 to slide freely along the axial direction (left and right direction) of the positioning rod, while restricting the offset of the pressure plate 2 in the front-back and up-down directions.

[0033] In one embodiment, the upper clearance hole 81 extends upward to the upper side of the pressure plate 2, and the lower clearance hole 82 extends downward to the lower side of the pressure plate 2. This structure is simple and easy to install, facilitating installation.

[0034] In one embodiment, the locking mechanism includes a sleeve 42 and a plurality of jaws 41, all of which are made of elastic material and are fixedly connected to the sleeve 42. The sleeve 42 has external threads, and the guide hole has internal threads. The external and internal threads are engaged. The guide rod 3 passes through the sleeve 42, and the guide hole has a guide cone surface 44. The guide cone surface 44 abuts against the jaws 41, causing the jaws 41 to retract and clamp the guide rod 3. The external thread of the sleeve 42 and the internal thread of the guide hole form a helical pair. Rotating the sleeve 42 allows it to move axially along the guide hole, thereby moving the jaws 41 closer to or further away from the guide cone surface 44. The guide cone surface 44 (an inclined surface with a diameter varying axially) within the guide hole contacts the jaws 41 made of elastic material. When the sleeve 42 moves the gripper 41 toward the small-diameter end of the guide cone 44, the cone compresses the gripper 41, forcing the elastic gripper 41 to contract radially, thereby gripping the guide rod 3 that passes through the sleeve 42. When the sleeve 42 is rotated in the opposite direction, the gripper 41 is released from the cone constraint, the elastic material recovers its deformation, the gripper 41 opens radially, and the guide rod 3 is released.

[0035] In one embodiment, the outer surface of each gripper 41 is chamfered near the edge of the guide cone surface 44. The chamfer transforms the right-angled edge of the outer surface of the gripper 41 into an inclined transition surface. When the sleeve 42 moves the gripper 41 toward the guide cone surface 44, the chamfered surface contacts the cone surface before the original outer surface of the gripper 41, forming a "wedge-shaped guide" effect, making the sliding of the gripper 41 along the cone surface smoother.

[0036] In one embodiment, all the grippers 41 are arranged in a circumferential array around the axis of the sleeve 42. Arranging all the grippers 41 in a circumferential array along the axis of the sleeve 42 (e.g., evenly distributed with 3, 4, or 6 grippers) forms a symmetrical clamping structure. The grippers 41 are arranged at equal angular intervals around the central axis of the sleeve 42 (e.g., 3 grippers distributed at 120°, 4 grippers distributed at 90°). When the guide cone surface 44 presses against the grippers 41, each gripper 41 contracts synchronously radially, creating a "multi-point symmetrical clamping" effect on the guide rod 3.

[0037] Optionally, a knob 43 is fixedly connected to the end of the sleeve 42 facing away from the gripper 41 to facilitate the operator to rotate the sleeve 42.

[0038] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A plate heat exchanger, comprising a frame (1), characterized in that, It also includes a positioning rod assembly, a pressure plate (2), a guide rod (3), a locking mechanism, multiple bolts (5), and multiple heat exchange plates (7) whose lengths extend vertically. The positioning rod assembly is located on the frame (1), and all the heat exchange plates (7) are located on the positioning rod assembly. The positioning rod assembly is used to guide the heat exchange plates (7) to limit the stacking of all the heat exchange plates (7) in the left-right direction. The frame (1) is provided with a guide hole extending in the left-right direction. The guide rod (3) passes through the guide hole. The locking mechanism is located on the frame (1) and is used to clamp or release the guide rod (3). The pressure plate (2) is fixed to one end of the guide rod (3). The bolts (5) lock the frame (1) and the pressure plate (2) so that the pressure plate (2) presses all the stacked heat exchange plates (7) onto the frame (1).

2. The plate heat exchanger according to claim 1, characterized in that, The positioning rod assembly includes an upper positioning rod (61) and a lower positioning rod (62). The upper positioning rod (61) and the lower positioning rod (62) are respectively disposed on the frame (1). The upper positioning rod (61) is disposed above the lower positioning rod (62). The heat exchange plate (7) is provided with an upper positioning hole and a lower positioning hole. The upper positioning rod (61) passes through the upper positioning hole, and the lower positioning rod (62) passes through the lower positioning hole.

3. The plate heat exchanger according to claim 2, characterized in that, The upper positioning hole extends upward to the upper side of the heat exchange plate (7), so that the upper side of the heat exchange plate (7) forms an upper opening (71) that connects to the upper positioning hole. The lower positioning hole extends downward to the lower side of the heat exchange plate (7), so that the lower side of the heat exchange plate (7) forms a lower opening (72) that connects to the lower positioning hole.

4. The plate heat exchanger according to claim 2, characterized in that, The frame (1) includes a left fixed plate (12) and a right column (13). The right column (13) is located on the right side of the left fixed plate (12). The pressure plate (2) is located between the left fixed plate (12) and the right column (13). All the heat exchange plates (7) are located between the pressure plate (2) and the left fixed plate (12). The right column (13) and the left fixed plate (12) are connected by the upper positioning rod (61) and the lower positioning rod (62).

5. The plate heat exchanger according to claim 4, characterized in that, The left fixing plate (12) has a first locking hole and a second locking hole, and the right column (13) has a third locking hole and a fourth locking hole. The upper positioning rod (61) is inserted into the first locking hole and the third locking hole. The upper positioning rod (61) includes an upper rod body (611) and two upper nuts (612). The lower positioning rod (62) includes a lower rod body (621) and two lower nuts (622). Both ends of the upper rod body (611) extend into upper threaded sections (613). The diameter of the upper threaded sections (613) is smaller than the diameter of the upper rod body (611), forming an upper step on the upper rod body (611). Both ends of the lower rod body (621) extend into lower threaded sections (623). The diameter of the lower threaded sections (623) is smaller than the diameter of the lower rod body (621), forming an upper step on the lower rod body (611). Both ends of the lower rod body (621) extend into lower threaded sections (623). The diameter of the lower threaded sections (623) is smaller than the diameter of the lower rod body (621), forming a lower step on the lower rod body (611). 621) A lower step is formed on the upper part, and the two lower threaded sections (623) are respectively inserted into the second locking hole and the fourth locking hole. The two lower steps are respectively abutted against the left fixing plate (12) and the right column (13) in a one-to-one correspondence. The two lower nuts (622) and the lower threaded sections (623) are threadedly engaged. The two lower nuts (622) are used to clamp the left fixing plate (12) and the right column (13). The two upper threaded sections (613) are respectively inserted into the first locking hole and the third locking hole. The two upper steps are respectively abutted against the left fixing plate (12) and the right column (13) in a one-to-one correspondence. The two upper nuts (612) and the upper threaded sections (613) are threadedly engaged. The two upper nuts (612) are used to clamp the left fixing plate (12) and the right column (13).

6. The plate heat exchanger according to claim 2, characterized in that, The pressure plate (2) is provided with an upper clearance hole (81) and a lower clearance hole (82), and the upper positioning rod (61) and the lower positioning rod (62) pass through the upper clearance hole (81) and the lower clearance hole (82) respectively.

7. The plate heat exchanger according to claim 6, characterized in that, The upper clearance hole (81) extends upward to the upper side of the pressure plate (2), and the lower clearance hole (82) extends downward to the lower side of the pressure plate (2).

8. The plate heat exchanger according to claim 1, characterized in that, The locking mechanism includes a sleeve (42) and a plurality of jaws (41). All the jaws (41) are made of elastic material. All the jaws (41) are fixedly connected to the sleeve (42). The sleeve (42) is provided with an external thread, and the guide hole is provided with an internal thread. The external thread and the internal thread are connected in a mating manner. The guide rod (3) passes through the sleeve (42), and the guide hole is provided with a guide cone surface (44). The guide cone surface (44) is used to abut against the jaws (41) so that the jaws (41) retract and clamp the guide rod (3).

9. The plate heat exchanger according to claim 8, characterized in that, The outer side of each of the grippers (41) is chamfered near the edge of the guide cone (44).

10. The plate heat exchanger according to claim 8, characterized in that, All of the grippers (41) are arranged in a circumferential array around the axis of the sleeve (42).

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