CN115247972B

CN115247972B - Plate heat exchanger

Info

Publication number: CN115247972B
Application number: CN202211169982.8A
Authority: CN
Inventors: 杨新敬; 辛立民
Original assignee: Zhuozhou Ruitewei Mechanical Equipment Co ltd
Current assignee: Zhuozhou Ruitewei Mechanical Equipment Co ltd
Priority date: 2022-09-26
Filing date: 2022-09-26
Publication date: 2022-12-20
Anticipated expiration: 2042-09-26
Also published as: CN115247972A

Abstract

The invention discloses a plate type heat exchanger, which relates to the technical field of heat exchangers and comprises a first mounting plate, a second mounting plate and a plurality of heat exchange plates, wherein a fastening mechanism capable of fastening the heat exchange plates together is arranged on the surface of the first mounting plate; this plate heat exchanger through power unit, pulling mechanism, switching mechanism, steering mechanism, valve mechanism mutually support to reached and to have switched the flow direction of the water through the heat exchanger automatically repeatedly, to the heat exchanger positive and negative washing back and forth, more be favorable to rushing out the inside plug of heat exchanger, make the clearance plug more convenient.

Description

Plate heat exchanger

Technical Field

The invention relates to the technical field of heat exchangers, in particular to a plate type heat exchanger.

Background

The detachable plate heat exchanger is made up by using several punched corrugated thin plates according to a certain interval, sealing their periphery by means of gasket, and using frame and pressing screw to make them overlap and tightly press, and the four corner holes of the plate and gasket are formed into the distribution pipe and collection pipe of fluid, at the same time, it can reasonably separate cold and hot fluids, and make them respectively flow in the flow channels of two sides of every plate, and make heat exchange by means of plate.

The plate heat exchanger is narrow in the channel between the plates, generally only 2 to 5mm, when a heat exchange medium contains large particles or fiber substances, the channel between the plates is easily blocked, so that the heat exchange effect is influenced, and the heat exchanger needs to be detached for cleaning, so that the blockage substances between the plates are inconvenient to clean.

Disclosure of Invention

The invention aims to provide a plate heat exchanger to solve the defects in the prior art.

In order to achieve the above purpose, the invention provides the following technical scheme: plate heat exchanger, including mounting panel one, mounting panel two and a plurality of heat transfer board, the surface of mounting panel one is provided with can be with the fastening device of a plurality of heat transfer board fastening together, the surface of heat transfer board is provided with heat transfer mechanism, the surface of mounting panel one is provided with pipeline mechanism, pipeline mechanism's inside be provided with power unit and with power unit complex pulling mechanism, pipeline mechanism's inside is provided with steering mechanism, valve mechanism, pipeline mechanism's surface be provided with steering mechanism, valve mechanism complex switching mechanism.

Furthermore, the fastening mechanism comprises a butt joint pipe fixedly connected to the surfaces of the first mounting plate and the second mounting plate, and the butt joint pipe can be in opposite communication with the two water through holes at the bottom of the heat exchange plate; the mounting plate I and the mounting plate II can be penetrated through, a threaded rod and a nut can be in threaded fit, and the surface of the mounting plate II is fixedly connected with a positioning rod.

Further, heat transfer mechanism is including offering locating hole, limbers and the recess on heat transfer plate surface, the locating hole can cooperate with the locating lever, and four limbers have been seted up on the surface of every heat transfer board, are located the four corners of heat transfer board respectively, and the both sides surface of heat transfer board all is seted up flutedly, recess and two vertical limbers intercommunication, the recess and the limbers intercommunication of difference of both sides, two adjacent heat transfer board mirror symmetry.

Furthermore, the pipeline mechanism comprises a first water outlet pipe and a second water outlet pipe which are fixedly arranged on the butt joint pipes and are communicated with the butt joint pipes, one ends of the first water outlet pipe and the second water outlet pipe are fixedly connected with water inlet pipes communicated with the water outlet pipes, the number of the pipeline mechanisms is two, and one end, far away from the water inlet pipes, of the first water outlet pipe and one end, far away from the water inlet pipes, of the second water outlet pipe of each pipeline mechanism are respectively in butt joint communication with one butt joint pipe on the first mounting plate and one butt joint pipe on the second mounting plate; the filter plate is characterized in that plug holes are formed in the first water outlet pipe and the second water outlet pipe, filter plates are installed on the first water outlet pipe and the second water outlet pipe in a threaded mode, compression springs are fixedly connected to the surfaces of the filter plates, plug balls are fixedly connected to the ends, far away from the filter plates, of the compression springs, and the plug balls can isolate the filter plates from the first water outlet pipe and the second water outlet pipe under the action of the compression springs.

Furthermore, the power mechanism comprises a water wheel which is rotatably connected inside the water inlet pipe, the water wheel is provided with a plurality of blades, the blades are fixedly connected with bulges, the bulges and the blades are rotationally symmetrical about a water wheel rotating shaft, and the inner surface of the water wheel is provided with a skewed tooth groove coaxial with the inner surface; the water inlet pipe is characterized by further comprising a first bevel gear, a second bevel gear and a third bevel gear, wherein the first bevel gear, the second bevel gear and the third bevel gear are rotationally connected with the water inlet pipe, the first driving lever is fixedly connected to the surface of the first bevel gear, the second driving lever is fixedly connected to the surface of the second bevel gear, the first bevel gear and the second bevel gear share the same axis and are all meshed with the third bevel gear, the first bevel gear and the second bevel gear rotate in the reverse direction, and when the first driving lever and the second driving lever are overlapped, a connecting line of the center of the first bevel gear and the middle point of the rotating track of the swing arm is perpendicular to the first driving lever and the second driving lever.

Further, the pulling mechanism includes the plug-pull rod that slides to peg graft and stretch out in inlet tube and upper end, the fixed surface of plug-pull rod is connected with the spline, and the keyway with spline fit is seted up on the surface of inlet tube, and the keyway is two shallow two dark for plug-pull rod can go up and down for the rotation of restriction plug-pull rod, the surface of plug-pull rod has cup jointed one end with it the fixed connection other end and the extension spring that the inlet tube rotated the joint, the lower extreme of plug-pull rod rotate be connected with can with skewed tooth groove complex gear shaft, the lower extreme of gear shaft is the helical gear, the helical gear can cooperate with skewed tooth groove, makes water wheels can drive gear shaft and rotate.

Furthermore, the switching mechanism comprises a swing arm which is rotatably connected with the water inlet pipe, and two limiting posts are fixedly connected to the water inlet pipe and used for limiting the rotation angle of the swing arm; still include one end and inlet tube and rotate and be connected, the other end rotates extension spring two of being connected with the swing arm for the swing arm swing is directly rotated to the opposite side to the end under extension spring two effects when surpassing vertical line, the spout has been seted up on the surface of swing arm.

Further, steering mechanism is including rotating the rotation wheel of connection in inlet tube, outlet pipe one and two intercommunications departments of outlet pipe, the skew centre of a circle's in surface of rotation wheel position fixedly connected with and spout sliding connection's protruding post, two passageways have been seted up to the inside of rotating the wheel for the swing arm rotates respectively when both sides and spacing post contact, can drive and rotate the wheel rotation, makes the passageway communicate inlet tube and outlet pipe one or with inlet tube and outlet pipe two intercommunication.

Furthermore, the valve mechanism comprises a first sliding rod which is connected in a first water outlet pipe and a second water outlet pipe in a sliding manner, the center of the first sliding rod is connected with a sliding chute in a sliding manner, two ends of the first sliding rod are respectively and rotatably connected with a connecting rod, one end, far away from the first sliding rod, of the connecting rod is rotatably connected with a second sliding rod, one end, far away from the connecting rod, of the second sliding rod is fixedly connected with a sliding plug which can be matched with the plug hole, one end, far away from the second sliding rod, of the sliding plug is fixedly connected with a sliding plate, the surface of the sliding plate is provided with a through hole, so that when the swinging arm is respectively rotated to two sides to be contacted with the limiting column, the plug hole in the first water outlet pipe can be smoothly aligned with the plug ball, water in the first water outlet pipe cannot impact the plug ball, the plug hole in the second water outlet pipe is blocked, and the through hole is aligned with the plug ball, so that water in the first water outlet pipe can impact the plug ball; or the plug hole in the water outlet pipe II is smooth, the through hole is obliquely opposite to the plug ball, so that water in the water outlet pipe I cannot impact the plug ball, the plug hole in the water outlet pipe I is blocked, and the through hole is opposite to the plug ball, so that water in the water outlet pipe I can impact the plug ball.

1. Compared with the prior art, the plate heat exchanger provided by the invention has the advantages that the power mechanism is arranged, so that water flow can drive the water wheel to rotate, the steering mechanism can be driven to steer, the valve mechanism can be driven to open and close, and energy is saved.

2. Compared with the prior art, the plate heat exchanger provided by the invention has the advantages that the swinging arm and the sliding groove are arranged, so that when the swinging arm swings, the rotating wheel can be driven to rotate, the flowing direction of water flowing through the rotating wheel is changed, the sliding rod I can be driven to slide, and the opening and closing of the valve mechanisms in the water outlet pipe I and the water outlet pipe II are controlled.

3. Compared with the prior art, the plate heat exchanger provided by the invention has the advantages that the power mechanism, the pulling mechanism, the switching mechanism, the steering mechanism and the valve mechanism are mutually matched, so that the flow direction of water passing through the heat exchanger can be automatically and repeatedly switched, the heat exchanger is flushed forwards and backwards, the blockage in the heat exchanger can be flushed out more conveniently, and the blockage can be cleaned more conveniently.

Drawings

In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to these drawings.

FIG. 1 is an exploded perspective view of a portion of a heat exchanger provided in accordance with an embodiment of the present invention;

FIG. 2 is a perspective view of a heat exchange plate provided in an embodiment of the present invention;

FIG. 3 is a schematic view of a portion of a plumbing mechanism provided by an embodiment of the present invention;

FIG. 4 is a schematic view of a portion of a toggle mechanism provided in an embodiment of the present invention;

fig. 5 is a partial schematic view of a switching mechanism according to an embodiment of the present invention.

Description of the reference numerals:

11. a first mounting plate; 12. a second mounting plate; 13. butt-joint pipes; 14. a threaded rod; 15. a nut; 16. positioning a rod; 21. a heat exchange plate; 22. positioning holes; 23. a water through hole; 24. a groove; 31. a water inlet pipe; 32. a first water outlet pipe; 33. a water outlet pipe II; 34. plugging holes; 35. filtering the plate; 41. a water wheel; 42. an oblique gullet; 43. a first bevel gear; 44. a second bevel gear; 45. a first deflector rod; 46. a second deflector rod; 47. a third bevel gear; 51. inserting and pulling a rod; 52. a first extension spring; 53. a gear shaft; 61. a swing arm; 62. a second extension spring; 63. a chute; 71. a rotating wheel; 72. a raised post; 73. a channel; 81. a first sliding rod; 82. a connecting rod; 83. a second sliding rod; 84. a sliding plug; 85. a slide plate; 86. a through hole; 91. plugging the ball; 92. compressing the spring.

Detailed Description

In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.

The first embodiment is as follows:

referring to fig. 1 to 3, the plate heat exchanger includes a first mounting plate 11, a second mounting plate 12, and a plurality of heat exchange plates 21, a fastening mechanism capable of fastening the plurality of heat exchange plates 21 is disposed on a surface of the first mounting plate 11, a heat exchange mechanism is disposed on a surface of the heat exchange plates 21, a pipeline mechanism is disposed on a surface of the first mounting plate 11, a power mechanism and a pulling mechanism matched with the power mechanism are disposed inside the pipeline mechanism, a steering mechanism and a valve mechanism are disposed inside the pipeline mechanism, and a switching mechanism matched with the steering mechanism and the valve mechanism is disposed on a surface of the pipeline mechanism.

The fastening mechanism comprises a butt joint pipe 13 fixedly connected to the surfaces of the first mounting plate 11 and the second mounting plate 12, and the butt joint pipe 13 can be in opposite communication with two water through holes 23 at the bottom of the heat exchange plate 21; the mounting plate comprises a first mounting plate 11, a second mounting plate 12 and a threaded rod 14 and a nut 15, wherein the threaded rod 14 and the nut 15 can penetrate through the first mounting plate and the second mounting plate and can be in threaded fit, and a positioning rod 16 is fixedly connected to the surface of the second mounting plate 12.

The heat exchange mechanism comprises positioning holes 22, water through holes 23 and grooves 24 which are formed in the surfaces of the heat exchange plates 21, the positioning holes 22 can be matched with the positioning rods 16, four water through holes 23 are formed in the surfaces of each heat exchange plate 21 and are respectively located at four corners of each heat exchange plate 21, the grooves 24 are formed in the surfaces of the two sides of each heat exchange plate 21, the grooves 24 are communicated with the two longitudinal water through holes 23, the grooves 24 on the two sides are communicated with the different water through holes 23, and the two adjacent heat exchange plates 21 are in mirror symmetry.

The pipeline mechanisms comprise a first water outlet pipe 32 and a second water outlet pipe 33 which are fixedly arranged on the butt joint pipe 13 and communicated with the butt joint pipe 13, one ends of the first water outlet pipe 32 and the second water outlet pipe 33 are fixedly connected with a water inlet pipe 31 communicated with the water outlet pipes, and the two pipeline mechanisms are arranged, wherein one ends, far away from the water inlet pipe 31, of the first water outlet pipe 32 and one ends, far away from the water inlet pipe 31, of the second water outlet pipe 33 of each pipeline mechanism are respectively in butt joint communication with one butt joint pipe 13 on the first mounting plate 11 and the second mounting plate 12; the first water outlet pipe 32 and the second water outlet pipe 33 are both internally provided with plug holes 34, and are all provided with filter plates 35 in a threaded manner, the surface of each filter plate 35 is fixedly connected with a compression spring 92, one end of each compression spring 92, which is far away from each filter plate 35, is fixedly connected with a plug ball 91, and each plug ball 91 can isolate the filter plate 35 from the first water outlet pipe 32 and the second water outlet pipe 33 under the action of the compression spring 92.

The power mechanism comprises a water wheel 41 which is rotatably connected inside the water inlet pipe 31, the water wheel 41 is provided with a plurality of blades, the blades are fixedly connected with protrusions, the protrusions and the blades are rotationally symmetrical about the rotating shaft of the water wheel 41, and the inner surface of the water wheel 41 is provided with a skewed tooth groove 42 which is coaxial with the protrusions; the water inlet pipe is characterized by further comprising a first bevel gear 43, a second bevel gear 44 and a third bevel gear 47 which are rotatably connected with the water inlet pipe 31, a first shift lever 45 is fixedly connected to the surface of the first bevel gear 43, a second shift lever 46 is fixedly connected to the surface of the second bevel gear 44, the first bevel gear 43 and the second bevel gear 44 are coaxial and are meshed with the third bevel gear 47, so that the first bevel gear 43 and the second bevel gear 44 rotate in opposite directions, and when the first shift lever 45 is superposed with the second shift lever 46, a connecting line of the circle center of the first bevel gear 43 and the midpoint of the rotating track of the swing arm 61 is perpendicular to the first shift lever 45 and the second shift lever 46.

Example two:

referring to fig. 3 to 5, the present embodiment provides a technical solution based on the first embodiment: the pulling mechanism comprises a pulling rod 51 which is inserted in the water inlet pipe 31 in a sliding mode and extends out of the upper end of the water inlet pipe 31, a spline is fixedly connected to the surface of the pulling rod 51, a key groove matched with the spline is formed in the surface of the water inlet pipe 31, the two shallow parts of the key groove are two deep parts, the pulling rod 51 can lift and can be used for limiting the rotation of the pulling rod 51, a first extension spring 52 with one end fixedly connected with the surface of the pulling rod 51 and the other end fixedly connected with the water inlet pipe 31 in a rotating mode is sleeved on the surface of the pulling rod 51, a gear shaft 53 capable of being matched with the helical gear groove 42 is rotatably connected to the lower end of the pulling rod 51, a spline is fixedly connected to the surface of the gear shaft 53, the first bevel gear 43 can be driven to rotate through the spline, the lower end of the gear shaft 53 is a helical gear, the helical gear can be matched with the helical gear groove 42, and the water wheel 41 can drive the gear shaft 53 to rotate.

The switching mechanism comprises a swing arm 61 which is rotatably connected with the water inlet pipe 31, and two limiting posts are fixedly connected on the water inlet pipe 31 and used for limiting the rotation angle of the swing arm 61; the water inlet pipe 31 is rotatably connected with the water inlet pipe, the other end of the water inlet pipe is rotatably connected with the swing arm 61, the swing arm 61 directly rotates to the bottom to the other side under the action of the second extension spring 62 when swinging beyond a vertical line, and the surface of the swing arm 61 is provided with a sliding groove 63.

The steering mechanism comprises a rotating wheel 71 which is rotatably connected to the communication position of the water inlet pipe 31, the first water outlet pipe 32 and the second water outlet pipe 33, a protruding column 72 which is in sliding connection with the sliding groove 63 is fixedly connected to the position, deviating from the circle center, of the surface of the rotating wheel 71, two channels 73 are formed in the rotating wheel 71, so that when the swinging arm 61 rotates to the two sides to be in contact with the limiting columns respectively, the rotating wheel 71 can be driven to rotate, and the channels 73 enable the water inlet pipe 31 to be communicated with the first water outlet pipe 32 or enable the water inlet pipe 31 to be communicated with the second water outlet pipe 33.

The valve mechanism comprises a first sliding rod 81 which is connected in a first water outlet pipe 32 and a second water outlet pipe 33 in a sliding mode, the center of the first sliding rod 81 is connected with a sliding chute 63 in a sliding mode, two ends of the first sliding rod 81 are respectively connected with a connecting rod 82 in a rotating mode, one end, far away from the first sliding rod 81, of the connecting rod 82 is connected with a second sliding rod 83 in a rotating mode, one end, far away from the connecting rod 82, of the second sliding rod 83 is fixedly connected with a sliding plug 84 which can be matched with the plug hole 34, one end, far away from the second sliding rod 83, of the sliding plug 84 is fixedly connected with a sliding plate 85, and a through hole 86 is formed in the surface of the sliding plate 85, so that when the swinging arm 61 rotates to two sides to be contacted with the limiting columns respectively, the plug hole 34 in the first water outlet pipe 32 can be unobstructed, the through hole 86 is obliquely aligned with the plug ball 91, water in the first water outlet pipe 32 cannot impact the plug ball 91, the plug hole 34 in the second water outlet pipe 33 is blocked, and the through hole 86 is aligned with the plug ball 91; or the plug hole 34 in the second water outlet pipe 33 is unobstructed, the through hole 86 is diagonally opposite to the plug ball 91, so that the water in the first water outlet pipe 32 cannot impact the plug ball 91, the plug hole 34 in the first water outlet pipe 32 is blocked, and the through hole 86 is directly opposite to the plug ball 91, so that the water in the first water outlet pipe 32 can impact the plug ball 91.

The working principle is as follows: when the blockage in the heat exchanger needs to be cleaned, the plugging rod 51 is lifted firstly, so that the spline on the surface of the plugging rod 51 is separated from the surface key groove of the water inlet pipe 31, then the plugging rod 51 is rotated to be capable of moving downwards under the action of the first extension spring 52, the gear shaft 53 which is rotatably connected with the lower end of the gear shaft 53 is driven to move downwards, the bevel gear fixedly connected with the lower end of the gear shaft 53 is matched with the bevel gear groove 42 of the water wheel 41, and the gear shaft 53 is enabled to rotate along with the water wheel 41.

Water enters from the water inlet pipe 31, the water wheel 41 is driven to rotate by the water wheel 41, the gear shaft 53 is driven to rotate by the water wheel 41 according to the previous principle, the bevel gear I43 in spline fit with the gear shaft 53 is driven to rotate, the bevel gear I43 drives the bevel gear II 44 to rotate reversely by the bevel gear III 47, so that the shift lever I45 and the shift lever II 46 which are fixedly connected with the bevel gear I43 and the bevel gear II 44 respectively rotate reversely, in the process of anticlockwise rotation of the shift lever II 46, the shift lever II is firstly contacted with the swing arm 61 and matched with the extension spring II 62, so that the lower end of the swing arm 61 rotates to the leftmost end, namely, the sliding groove 63 in the upper half part drives the rotating wheel 71 in sliding connection with the sliding groove to rotate clockwise, and drives the sliding rod I81 to move rightwards, so that the channel 73 in the rotating wheel 71 communicates the water inlet pipe 31 and the water outlet pipe II 33, the connecting rod 82 in rotary connection with the two ends of the sliding rod 81 conveniently drives the sliding rod II 83 to move, so that the sliding plug 84 in the water outlet pipe I32 plugs 34 in the sliding groove, the sliding plug ball 91, the through hole 86 is opposite to the plug ball 91, and the water outlet pipe 84 leaves the sliding plug 34 in the water outlet pipe 33, and the through hole 86 deviates from the plug ball 91. Water enters the second water outlet pipe 33 through the channel 73 and enters the heat exchanger from the right butt joint pipe 13 to wash the inside of the heat exchanger, the washed water is introduced into the first water outlet pipe 32 from the left butt joint pipe 13 of the heat exchanger and is discharged between the plug ball 91 and the filter plate 35 by extruding the plug ball 91 in the first water outlet pipe, and the filter plate 35 is in threaded connection with the first water outlet pipe 32 and the second water outlet pipe 33 to be conveniently detached, so that slag removal is facilitated.

The water wheel 41 continues to rotate to drive the first shifting lever 45 fixedly connected with the first bevel gear 43 to shift the swing arm 61 to rotate anticlockwise, so that the rotating wheel 71 rotates anticlockwise, the channel 73 is communicated with the first water inlet pipe 31 and the first water outlet pipe 32, and the heat exchanger can be reversely flushed in the same way. The water wheel 41 rotates continuously, and can flush water from the two sides of the heat exchanger in a reciprocating manner, so that blockages can be flushed out of the heat exchanger conveniently.

When the plug-in rod 51 is not required to be normally washed, the plug-in rod is lifted upwards in the same way, so that after a spline on the surface of the plug-in rod is inserted into a key groove on the surface of the water inlet pipe 31, the gear shaft 53 moves upwards along with the spline to enable a helical gear at the lower end of the gear shaft to leave the helical tooth groove 42 and not rotate along with the water wheel 41, the rotating wheel 71 stops rotating, water flow stably enters the heat exchanger from one side, and heat exchange is facilitated.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.

Claims

1. Plate heat exchanger, including mounting panel one (11), mounting panel two (12) and a plurality of heat transfer board (21), its characterized in that: the surface of the mounting plate I (11) is provided with a fastening mechanism capable of fastening a plurality of heat exchange plates (21) together, the surface of each heat exchange plate (21) is provided with a heat exchange mechanism, the surface of the mounting plate I (11) is provided with a pipeline mechanism, a power mechanism and a pulling mechanism matched with the power mechanism are arranged inside the pipeline mechanism, a steering mechanism and a valve mechanism are arranged inside the pipeline mechanism, and a switching mechanism matched with the steering mechanism and the valve mechanism is arranged on the surface of the pipeline mechanism; the fastening mechanism comprises a butt joint pipe (13) fixedly connected to the surfaces of the first mounting plate (11) and the second mounting plate (12); the pipeline mechanism comprises a first water outlet pipe (32) and a second water outlet pipe (33) which are fixedly mounted on the butt joint pipe (13) and communicated with the butt joint pipe, one ends of the first water outlet pipe (32) and the second water outlet pipe (33) are fixedly connected with a water inlet pipe (31) communicated with the water outlet pipe, plug holes (34) are formed in the first water outlet pipe (32) and the second water outlet pipe (33) respectively, filter plates (35) are mounted on the inner portions of the first water outlet pipe (32) and the inner portions of the second water outlet pipe (33) respectively in a threaded mode, compression springs (92) are fixedly connected to the surfaces of the filter plates (35), and plug balls (91) are fixedly connected to one ends, far away from the filter plates (35), of the compression springs (92); the power mechanism comprises a water wheel (41) which is rotatably connected inside the water inlet pipe (31), and the inner surface of the water wheel (41) is provided with an inclined tooth groove (42) which is coaxial with the water wheel; the water inlet pipe is characterized by further comprising a first bevel gear (43), a second bevel gear (44) and a third bevel gear (47), wherein the first bevel gear (43), the second bevel gear (44) and the third bevel gear (47) are rotatably connected with the water inlet pipe (31), a first driving lever (45) is fixedly connected to the surface of the first bevel gear (43), a second driving lever (46) is fixedly connected to the surface of the second bevel gear (44), and the first bevel gear (43) and the second bevel gear (44) are coaxial and are meshed with the third bevel gear (47); the shifting mechanism comprises a plugging rod (51) which is inserted in the water inlet pipe (31) in a sliding mode and extends out of the upper end of the plugging rod, the surface of the plugging rod (51) is fixedly connected with a spline, the surface of the plugging rod (51) is sleeved with a first extension spring (52) of which one end is fixedly connected with the first extension spring and the other end is rotationally clamped with the water inlet pipe (31), and the lower end of the plugging rod (51) is rotationally connected with a gear shaft (53) which can be matched with the helical tooth groove (42); the switching mechanism comprises a swing arm (61) which is rotatably connected with the water inlet pipe (31); the water inlet pipe is characterized by further comprising a second extension spring (62) with one end rotatably connected with the water inlet pipe (31) and the other end rotatably connected with a swing arm (61), and the surface of the swing arm (61) is provided with a sliding groove (63); the steering mechanism comprises a rotating wheel (71) which is rotatably connected to the communication position of the water inlet pipe (31), the water outlet pipe I (32) and the water outlet pipe II (33), a protruding column (72) which is in sliding connection with the sliding groove (63) is fixedly connected to the position, deviating from the circle center, of the surface of the rotating wheel (71), and two channels (73) are formed in the rotating wheel (71); the valve mechanism comprises a first sliding rod (81) which is slidably connected into a first water outlet pipe (32) and a second water outlet pipe (33), the center of the first sliding rod (81) is connected with a sliding groove (63) in a sliding mode, two ends of the first sliding rod (81) are respectively rotatably connected with a connecting rod (82), one end, far away from the first sliding rod (81), of the connecting rod (82) is rotatably connected with a second sliding rod (83), one end, far away from the connecting rod (82), of the second sliding rod (83) is fixedly connected with a sliding plug (84) which can be matched with a plug hole (34), one end, far away from the second sliding plug (83), of the second sliding plug (84) is fixedly connected with a sliding plate (85), and a through hole (86) is formed in the surface of the sliding plate (85).

2. A plate heat exchanger according to claim 1, wherein: the fastening mechanism further comprises a threaded rod (14) and a nut (15) which can penetrate through the first mounting plate (11) and the second mounting plate (12) and can be in threaded fit, and a positioning rod (16) is fixedly connected to the surface of the second mounting plate (12).

3. A plate heat exchanger according to claim 2, wherein: the heat exchange mechanism comprises a positioning hole (22), a water through hole (23) and a groove (24) which are formed in the surface of the heat exchange plate (21), and the positioning hole (22) can be matched with the positioning rod (16).