A symmetrical plate heat exchanger and heat exchange method thereof

Abstract

The present invention relates to the technical field of plate heat exchangers, and specifically to a symmetrical plate heat exchanger and a heat exchange method thereof, comprising: a plate heat exchanger body, on which a fluid inlet is arranged; a sleeve pipe connected to the plate heat exchanger body and coaxial with the sleeve pipe; a switching plate, sealingly and slidingly arranged between the sleeve pipe and the fluid inlet, on which two groups of filter plates are detachably mounted; a switching assembly connected to the switching plate, the switching assembly being capable of making one of the filter plates coaxial with the fluid inlet; a pneumatic drive assembly communicated with the sleeve pipe, on which an engaging wheel is rotatably mounted; a driving plate connected to the switching assembly, on which a guide groove is formed, the guide groove cooperates with the engaging wheel to drive the switching assembly to actuate when the pressure in the sleeve pipe increases, thereby preventing the fluid channel from being blocked.

Description

Technical Field

[0001] The invention relates to the technical field of plate heat exchangers, in particular to a symmetrical plate heat exchanger and a heat exchange method thereof. Background Art

[0002] Plate heat exchangers can significantly improve production efficiency, reduce energy consumption and operating costs, and protect the environment. They are important equipment that is indispensable in modern industrial production and are widely used in industries such as steel, food processing, and sewage treatment.

[0003] When the plate heat exchanger is in use, the fluid to be heated or cooled enters its interior and exchanges heat with the hot or cold fluid flowing through the plate heat exchanger to complete the heating or cooling. In this process, impurities are inevitably present in the fluid to be heated or cooled. In order to ensure the heat exchange effect, the fluid channels inside the plate heat exchanger are very narrow, and impurities entering the plate heat exchanger can easily cause blockage.

[0004] For this reason, the fluid inlet of the existing plate heat exchanger is generally equipped with a filtering structure. After impurities accumulate, this filtering structure needs to be cleaned, otherwise it will affect the flow rate of the fluid and cause the fluid to be overheated or cooled. Frequent disassembly, on the one hand, increases the amount of manual operation, and on the other hand, it also leads to a decrease in the utilization rate of the plate heat exchanger and reduces its processing capacity. Summary of the invention

[0005] The object of the present invention is to provide a symmetrical plate heat exchanger and a heat exchange method thereof to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A symmetrical plate heat exchanger, comprising:

[0008] A plate heat exchanger body, wherein a fluid inlet is provided on the plate heat exchanger body;

[0009] A sleeve pipe connected to the plate heat exchanger body and coaxial with the fluid inlet;

[0010] A switching plate, sealingly and slidably disposed between the sleeve pipe and the fluid inlet, and two sets of filter plates are detachably mounted on the switching plate;

[0011] A switching assembly connected to the switching plate, wherein the switching assembly can make one of the filter plates coaxial with the fluid inlet;

[0012] A pneumatic drive assembly is connected to the sleeve pipe, and an engaging wheel is rotatably mounted on the pneumatic drive assembly;

[0013] A driving plate is connected to the switching assembly. A guide groove is formed on the driving plate. The guide groove cooperates with the engaging wheel to drive the switching assembly to operate when the pressure in the sleeve increases.

[0014] As a further solution of the present invention: two groups of connecting plates are symmetrically arranged on the plate heat exchanger body, the connecting plates are connected to the sleeve pipe, and a guide member is respectively arranged on the opposite side of the two groups of connecting plates, and the guide member is slidably connected to the guide groove arranged on the switching plate;

[0015] The switching assembly includes an energy storage plate connected to the switching plate and an energy storage structure arranged on one group of the connecting plates, and an abutment wheel is rotatably mounted on the energy storage structure, and the abutment wheel can roll along the side of the energy storage plate.

[0016] As a further solution of the present invention: two groups of inclined surfaces are formed on one side of the energy storage plate facing the abutting wheel, and an outer protrusion is provided at the connection between the two groups of inclined surfaces;

[0017] The energy storage structure comprises a slide groove arranged along the length direction of the connecting plate, a sliding block connected to the abutting wheel is slidably installed in the slide groove, and the sliding block is connected to the slide groove through a No. 1 spring.

[0018] As a further solution of the present invention: the pneumatic drive assembly includes a sealing cylinder body connected to the sleeve pipe, a convex ring is formed in the sealing cylinder body, and a sealing plug is sealingly and slidably installed in the sealing cylinder body, a vertical shaft penetrating the sealing cylinder body is installed on the sealing plug, and a No. 2 spring is sleeved on the vertical shaft;

[0019] One end of the vertical shaft away from the sealing plug is connected with a connecting frame, and the connecting frame is connected to the engaging wheel.

[0020] As a further solution of the present invention: the guide groove member includes two groups of inclined grooves, two groups of vertical grooves, two groups of accommodating grooves and two groups of horizontal grooves symmetrically arranged on the driving plate, the two groups of inclined grooves intersect, and the two groups of vertical grooves, the two groups of accommodating grooves and the two groups of horizontal grooves are parallel respectively;

[0021] The horizontal groove is perpendicular to the vertical groove, and the vertical groove is collinear with the containing groove;

[0022] The guide groove member further comprises a deflection structure which is arranged on the driving plate and is used for guiding the engaging wheel to directional roll.

[0023] As a further solution of the present invention: the deflection structure comprises a first switching member rotatably mounted at one end of the vertical slot away from the horizontal slot and two groups of second switching members rotatably mounted at the intersection of the two groups of inclined slots;

[0024] The second switching member is adapted to a stop surface formed on the driving plate.

[0025] As a further solution of the present invention: two groups of connecting shafts are symmetrically arranged on the connecting plate, a sleeve shaft is rotatably sleeved on the connecting shaft, one end of the sleeve shaft is connected to a counterweight block, and the other end is connected to an elastic plate, and the elastic plate is adapted to the abutment shaft connected to the connecting frame;

[0026] A stopper set is arranged between the sleeve shaft and the connecting shaft.

[0027] As a further solution of the present invention: the stopper kit includes a limiting portion arranged at the end of the connecting shaft, and the limiting portion is adapted to the arc-shaped groove arranged on the sleeve shaft.

[0028] A heat exchange method for a plate heat exchanger as described above comprises the following steps:

[0029] Step 1: Pipeline connection: the fluid to be heated / cooled needs to be connected to the sleeve pipe;

[0030] Step 2: Pump the fluid to be heated / cooled into the plate heat exchanger body through the sleeve;

[0031] Step 3: When impurities in the fluid to be heated / cooled clog the filter plate, the pneumatic drive assembly will be activated and drive the engaging wheel to move along the guide groove, and the switching assembly connected to the drive plate will be activated;

[0032] Step 4: When the engaging wheel rises to the highest point of the stroke, the switching assembly drives the other filter plate to be coaxial with the sleeve pipe;

[0033] Step 5: The engaging wheel is reset and drives the counterweight to move. The counterweight knocks the filter plate to shake off the impurities on the filter plate.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] By setting the switching assembly, when the filter plate is blocked by impurities in the fluid while filtering the fluid, the other set of filter plates can switch positions with the blocked filter plate to prevent the filter plate from being blocked and causing the flow rate of the fluid to decrease, causing the fluid to be overheated or cooled. At the same time, the rapid switching between the two sets of filter plates shortens the downtime of the plate heat exchanger, thereby improving the working efficiency of the plate heat exchanger.

[0036] By means of the pneumatic drive assembly and the drive plate, when the filter plate is blocked and the pressure in the sleeve tube increases, the interlocking wheel can actively move upward and cooperate with the guide groove member to drive the energy storage plate to move. At this time, the conduction of the sleeve tube further decreases, and the rising speed of the interlocking wheel is accelerated to further accelerate the switching speed of the two groups of filter plates. At the same time, the energy storage plate cooperates with the No. 1 spring to act on the drive plate in the reverse direction, so that the interlocking wheel can be reset to the accommodating groove on the other side along the horizontal groove and the vertical groove, so that the two groups of filter plates can realize automatic bidirectional switching after being blocked, thereby ensuring the constant flow rate of the fluid and the stability of heating or cooling;

[0037] By setting the counterweight block, elastic plate and abutment shaft, after the filter plate is switched, the counterweight block can be driven to impact one side of the filter plate, so that impurities on the other side of the filter plate are shaken off, avoiding impurities still adhering to the surface of the filter plate when the filter plate is switched next time, ensuring that after the filter plate is switched, the impurities can be filtered without affecting the fluid flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 The figure is a schematic structural diagram of an embodiment of a symmetrical plate heat exchanger.

[0039] Figure 2 The present invention is a schematic structural diagram of a sleeve pipe, a switching plate, a switching assembly, a pneumatic drive assembly and a drive plate in an embodiment of a symmetrical plate heat exchanger.

[0040] Figure 3 It is a structural schematic diagram from another angle of the figure.

[0041] Figure 4 The figure is a schematic structural diagram of a fluid inlet, a switching plate, and a sleeve pipe in an embodiment of a symmetrical plate heat exchanger.

[0042] Figure 5 The figure is a schematic diagram of the structure of a switching plate and a filter plate in an embodiment of a symmetrical plate heat exchanger.

[0043] Figure 6 The figure is a schematic diagram of the structure of the air pressure drive assembly in one embodiment of a symmetrical plate heat exchanger.

[0044] Figure 7 The figure is a schematic diagram of the structure of a driving plate in an embodiment of a symmetrical plate heat exchanger.

[0045] Figure 8 The figure is a schematic diagram of the structure of a switching assembly in an embodiment of a symmetrical plate heat exchanger.

[0046] Fig. 9 The present invention is a schematic structural diagram of a transverse axis, a sleeve axis, a counterweight block and an elastic plate in an embodiment of a symmetrical plate heat exchanger.

[0047] Fig.10 The schematic diagram is a structural diagram of a symmetrical plate heat exchanger when a counterweight hits a filter plate in one embodiment.

[0048] In the figure: 1, plate heat exchanger body; 2, fluid inlet; 3, sleeve pipe; 4, connecting plate; 401, slide groove; 5, guide member; 6, switching plate; 601, guide groove; 602, arc groove; 603, insertion groove; 7, filter plate; 701, convex shaft; 8, No. 1 spring; 9, horizontal shaft; 10, slider; 11, abutment wheel; 12, energy storage plate; 1201, inclined surface; 1202, external protrusion; 13, sealing cylinder; 1301, convex ring; 14. Spring No. 2; 15. Sealing plug; 16. Connecting frame; 17. Engaging wheel; 18. Abutting shaft; 19. Driving plate; 1901. Inclined groove; 1902. Vertical groove; 1903. Accommodating groove; 1904. Horizontal groove; 1905. Stop surface; 20. Switching member No. 1; 21. Switching member No. 2; 22. Connecting shaft; 2201. Limiting part; 23. Sleeve shaft; 2301. Arc-shaped notch; 24. Counterweight; 25. Elastic plate. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0051] See also Figure 1 to Figure 10In an embodiment of the present invention, a symmetrical plate heat exchanger includes: a plate heat exchanger body 1, a sleeve tube 3, a switching plate 6, a switching assembly, a pneumatic drive assembly and a driving plate 19, so that when the filter plate 7 is blocked and the pressure in the sleeve tube 3 increases, the engaging wheel 17 can actively move upward and cooperate with the guide groove member to drive the energy storage plate 12 to move. At this time, the conduction of the sleeve tube 3 further decreases, and the ascending speed of the engaging wheel 17 is accelerated to further accelerate the switching speed of the two groups of filter plates 7. At the same time, the energy storage plate 12 cooperates with the first spring 8 to act on the driving plate 19 in the reverse direction, so that the engaging wheel 17 can be reset to the accommodating groove 1903 on the other side along the horizontal groove 1904 and the vertical groove 1902, so that the two groups of filter plates 7 can realize automatic bidirectional switching after being blocked, ensuring the constant flow rate of the fluid and the heating or cooling stability, as follows:

[0052] The plate heat exchanger body 1 is provided with a fluid inlet 2;

[0053] The sleeve 3 is connected to the plate heat exchanger body 1 and is coaxial with the fluid inlet 2;

[0054] Two groups of connecting plates 4 are symmetrically arranged on the plate heat exchanger body 1, and the connecting plates 4 are connected to the sleeve pipe 3, and a guide member 5 is arranged on each opposite side of the two groups of connecting plates 4, and the guide member 5 is slidably connected to the guide groove 601 arranged on the switching plate 6;

[0055] The switch plate 6 is sealingly and slidably arranged between the sleeve pipe 3 and the fluid inlet 2. Two groups of filter plates 7 are detachably mounted on the switch plate 6. Specifically, a plurality of convex shafts 701 are equidistantly arranged on the side of the filter plate 7. Two groups of insertion grooves are formed on the switch plate 6. A plurality of arc grooves 602 are equidistantly arranged on the inner wall of the insertion groove. An insertion groove 603 is arranged at one end of the arc groove 602. When installing the filter plate 7, the convex shaft 701 is aligned with the insertion groove 603. 03, and apply force to the filter plate 7, so that the convex shaft 701 can move along the insertion groove 603, and after the convex shaft 701 moves to the end of the insertion groove 603, the filter plate 7 is rotated, and the convex shaft 701 will move along the arc groove 602 again, and after the convex shaft 701 moves to the end of the arc groove 602, the connection between the filter plate 7 and the switching plate 6 is realized, and in order to prevent the filter plate 7 from rotating and separating from the switching plate 6, a part of damping material can be filled on the outer side of the circumference of the filter plate 7 to improve the stability of the two after the connection;

[0056] Similarly, during disassembly, the above actions need only be performed in reverse. Based on the above principle, the filter plate 7 can be quickly disassembled and installed, which can reduce the difficulty of loading and unloading the filter plate 7 on the one hand, and avoid long-term shutdown of the plate heat exchanger on the other hand, thereby improving its utilization rate.

[0057] The switching assembly is connected to the switching plate 6, and the switching assembly can make one of the filter plates 7 coaxial with the fluid inlet 2. The switching assembly includes an energy storage plate 12 connected to the switching plate 6 and an energy storage structure arranged on one group of the connecting plates 4, and an abutment wheel 11 is rotatably mounted on the energy storage structure, and the abutment wheel 11 can roll along the side of the energy storage plate 12;

[0058] The energy storage plate 12 is formed with two groups of inclined surfaces 1201 on one side facing the abutting wheel 11, and an outer protrusion 1202 is provided at the connection between the two groups of inclined surfaces 1201;

[0059] The energy storage structure includes a slide groove 401 arranged along the length direction of the connecting plate 4, and a slider 10 connected to the abutting wheel 11 is slidably installed in the slide groove 401. The slider 10 and the slide groove 401 are connected by a spring No. 8. Specifically, a transverse axis 9 is arranged in the slide groove 401, and the spring No. 8 is sleeved on the transverse axis 9, and one end of the spring No. 1 8 is connected to the slider 10, and the other end is connected to the side wall of the slide groove 401.

[0060] In the initial state, spring No. 1 8 is in a compressed state, and the abutment wheel 11 is in one of the inclined surfaces 1201, so that in this state, the energy storage plate 12 can drive the guide member 5 to abut against one side of the guide groove 601, and at the same time, one of the filter plates 7 and the sleeve tube 3 are in an overlapping state, so that the filter plate 7 has a higher position stability, avoiding fluid impact or equipment vibration that causes the filter plate 7 to shift and cause fluid leakage.

[0061] When the filter holes on the filter plate 7 are partially blocked due to impurities in the fluid, the energy storage plate 12 will drive the switching plate 6 to move horizontally. At this time, the abutment wheel 11 will move along the inclined surface 1201 toward the outer protrusion 1202. During this process, the No. 1 spring 8 will be further compressed to store elastic potential energy. When the abutment wheel 11 moves over the outer protrusion 1202, the No. 1 spring 8 will release the elastic potential energy and actively drive the energy storage plate 12 to move. At this time, the energy storage plate 12 can drive the switching plate 6 to move at a faster speed, and when it moves to the end of the stroke, the other filter plate 7 overlaps with the sleeve tube 3, that is, when one group of filter plates 7 is (partially) blocked, the other group of filter plates 7 can achieve position switching with the filter plate 7, thereby reducing the resistance of the fluid flowing through the filter plate 7.

[0062] Through the above arrangement, when the filter plate 7 is blocked by impurities in the fluid while filtering the fluid, the other group of filter plates 7 can switch positions with the blocked filter plate 7 to prevent the filter plate 7 from being blocked and causing the flow rate of the fluid to decrease, causing the fluid to be overheated or cooled. At the same time, the rapid switching between the two groups of filter plates 7 shortens the downtime of the plate heat exchanger, thereby improving the working efficiency of the plate heat exchanger.

[0063] See also Figure 6~Figure 7 , the pneumatic drive assembly is connected with the sleeve tube 3, and a mating wheel 17 is rotatably installed on the pneumatic drive assembly; the pneumatic drive assembly includes a sealing cylinder body 13 connected with the sleeve tube 3, a convex ring 1301 is formed in the sealing cylinder body 13, and a sealing plug 15 is sealingly and slidably installed in the sealing cylinder body 13, a vertical shaft penetrating the sealing cylinder body 13 is installed on the sealing plug 15, and a No. 2 spring 14 is sleeved on the vertical shaft, one end of the No. 2 spring 14 is connected to the sealing plug 15, and the other end is connected to the inner wall of the sealing cylinder body 13;

[0064] The end of the vertical shaft away from the sealing plug 15 is connected to a connecting frame 16, and the connecting frame 16 is connected to the engaging wheel 17;

[0065] The driving plate 19 is connected to the energy storage plate 12, and a guide groove is formed on the driving plate 19. The guide groove cooperates with the engaging wheel 17 to drive the switching assembly to operate when the pressure in the sleeve tube 3 increases.

[0066] The guide groove member includes two groups of inclined grooves 1901, two groups of vertical grooves 1902, two groups of accommodating grooves 1903 and two groups of horizontal grooves 1904 symmetrically arranged on the driving plate 19, the two groups of inclined grooves 1901 intersect, the two groups of vertical grooves 1902, the two groups of accommodating grooves 1903 and the two groups of horizontal grooves 1904 are parallel respectively;

[0067] The horizontal groove 1904 is perpendicular to the vertical groove 1902, and the vertical groove 1902 is colinear with the containing groove 1903;

[0068] The guide groove member also includes a deflection structure disposed on the driving plate 19 and used to guide the directional rolling of the engaging wheel 17, the deflection structure including a No. 1 switching member 20 rotatably mounted at one end of the vertical groove 1902 away from the horizontal groove 1904 and two groups of No. 2 switching members 21 rotatably mounted at the intersection of the two groups of inclined grooves 1901, wherein a torsion spring is disposed at the rotating shaft of the No. 1 switching member 20, so that the No. 1 switching member 20 has a tendency to fit with the side wall of the vertical groove 1902, which is the side wall of the vertical groove 1902 away from the No. 2 switching member 21;

[0069] The second switching member 21 is adapted to a stop surface 1905 formed on the driving plate 19 .

[0070] When in use, the fluid to be heated / cooled enters from the sleeve tube 3, passes through the filter plate 7 and enters the plate heat exchanger body 1 from the fluid inlet 2, wherein the setting of the filter plate 7 can effectively prevent impurities in the fluid to be heated / cooled from entering the plate heat exchanger body 1 and causing blockage of the internal pipeline of the plate heat exchanger body 1.

[0071] In the initial state, the engaging wheel 17 is at the lower end of the accommodating groove 1903, and the No. 2 spring 14 is in a compressed state. At this time, the sealing plug 15 is in contact with the convex ring 1301. As the fluid to be heated / cooled flows, the impurities generated on the filter plate 7 will gradually increase. At this time, the conductance of the filter plate 7 decreases, and the pressure on the side of the filter plate 7 toward the sleeve tube 3 increases. The pressure acts on the sealing plug 15 to move the sealing plug 15 away from the central axis of the sleeve tube 3 along the length direction of the sealing cylinder 13, further compressing the No. 2 spring 14 and moving the engaging wheel 17 upward. At this time:

[0072] The engaging wheel 17 will move upward along the accommodating groove 1903, and when it abuts against the No. 1 switching member 20, it will enter the inclined groove 1901 under the guidance of the No. 1 switching member 20. At this time, the driving plate 19 will drive the energy storage plate 12 to move horizontally, so that the No. 1 spring 8 stores elastic potential energy and gradually misaligns the filter plate 7 and the sleeve tube 3. At this time, the conduction of the sleeve tube 3 is further reduced, and the pressure drop in the sleeve tube 3 is further increased, so that the upward movement speed of the engaging wheel 17 is further accelerated. When the engaging wheel 17 abuts against the No. 2 switching member 21, the engaging wheel 17 can drive the No. 2 switching member 21 to deflect. When the No. 2 switching member 21 deflects to abut against the stop surface 1905, the No. 2 switching member 21 can guide the engaging wheel 17 to continue moving until the engaging wheel 17 moves to the end of the inclined groove 1901, and the abutting wheel 11 also moves. After the outer protrusion 1202 is moved, the No. 1 spring 8 releases its elastic potential energy and can actively drive the energy storage plate 12 to move to complete the switching of the filter plate 7. At the same time, the energy storage plate 12 can drive the driving plate 19 to actively move, so that the engaging wheel 17 can move along the horizontal groove 1904, and when the engaging wheel 17 moves to the end of the horizontal groove 1904, the engaging wheel 17 enters the vertical groove 1902. At this time, the No. 2 spring 14 will release its elastic potential energy to make the engaging wheel 17 move downward along the vertical groove 1902, and when the engaging wheel 17 abuts against the No. 1 switching member 20, the No. 1 switching member 20 can be deflected, and when the engaging wheel 17 enters the accommodating groove 1903, the No. 1 switching member 20 is reset, so that when the filter plate 7 is switched next time, the engaging wheel 17 can repeat the above process under the guidance of the No. 1 switching member 20.

[0073] Through the above arrangement, when the filter plate 7 is blocked and the pressure in the sleeve tube 3 increases, the engaging wheel 17 can actively move upward and cooperate with the guide groove to drive the energy storage plate 12 to move. At this time, the conduction of the sleeve tube 3 further decreases, and the ascending speed of the engaging wheel 17 is accelerated to further accelerate the switching speed of the two groups of filter plates 7. At the same time, the energy storage plate 12 cooperates with the No. 1 spring 8 to act in the reverse direction on the driving plate 19, so that the engaging wheel 17 can be reset to the accommodating groove 1903 on the other side along the horizontal groove 1904 and the vertical groove 1902, so that the two groups of filter plates 7 can achieve automatic two-way switching after being blocked, thereby ensuring the constant flow rate of the fluid and the heating or cooling stability.

[0074] See also Figure 6 , Figure 9~Figure 10 , two groups of connecting shafts 22 are symmetrically arranged on the connecting plate 4, a sleeve shaft 23 is rotatably sleeved on the connecting shaft 22, one end of the sleeve shaft 23 is connected to a counterweight block 24, and the other end is connected to an elastic plate 25, and the elastic plate 25 is adapted to the abutment shaft 18 connected to the connecting frame 16;

[0075] A stopper set is provided between the sleeve shaft 23 and the connecting shaft 22 . The stopper set includes a limiting portion 2201 provided at the end of the connecting shaft 22 . The limiting portion 2201 is adapted to an arc-shaped notch 2301 provided on the sleeve shaft 23 .

[0076] After the filter plate 7 is switched, the pressure in the sleeve tube 3 will return to normal. At this time, driven by the second spring 14, the engaging wheel 17 can accelerate downward along the vertical groove 1902 and drive the abutment shaft 18 to accelerate downward. When the engaging wheel 17 moves to the lower end of the accommodating groove 1903, the abutment shaft 18 will collide with the elastic plate 25, thereby driving the sleeve shaft 23 to rotate, so as to drive the counterweight block 24 to deflect away from the filter plate 7. In this process, the limiting portion 2201 can The counterweight 24 can separate from the side wall of one side of the arc-shaped groove 2301, and after colliding with the side wall on the other side, the counterweight 24 moves in the opposite direction. Since the collision between the abutment shaft 18 and the elastic plate 25 gives the counterweight 24 initial kinetic energy, the counterweight 24 can further move toward the filter plate 7 after resetting to the initial state, and collide with one side of the filter plate 7, thereby shaking off the impurities on the other side of the filter plate 7, ensuring that the impurities on the surface of the filter plate 7 are removed when the filter plate 7 is switched next time.

[0077] It is worth noting that when the filter plate 7 is just used, the adhesion of impurities on its surface is relatively small. At this time, the impurities can be eliminated by the impact of the counterweight block 24. However, as the use time of the filter plate 7 increases, the adhesion of the residual impurities on its surface will increase. At this time, using the counterweight block 24 to impact the filter plate 7 may not be able to completely remove the impurities on its surface. At this time, the filter plate 7 needs to be manually removed for cleaning.

[0078] Through the above arrangement, after the filter plate 7 is switched, the counterweight 24 can be driven to impact one side of the filter plate 7, so that impurities on the other side of the filter plate 7 are shaken off, thereby avoiding impurities still adhering to the surface of the filter plate 7 when the filter plate 7 is switched next time, thereby ensuring that after the filter plate 7 is switched, the impurities can be filtered without affecting the fluid flow rate.

[0079] As an embodiment of the present invention, a heat exchange method for a plate heat exchanger is also proposed, comprising the following steps:

[0080] Step 1: Pipeline connection: the fluid to be heated / cooled needs to be connected to the sleeve pipe 3;

[0081] Step 2: Pump the fluid to be heated / cooled through the sleeve pipe 3 into the plate heat exchanger body 1;

[0082] Step 3: When impurities in the fluid to be heated / cooled clog the filter plate 7, the pneumatic drive assembly will be activated and drive the engaging wheel 17 to move along the guide groove, and at this time the switching assembly connected to the drive plate 19 will be activated;

[0083] Step 4: When the engaging wheel 17 rises to the highest point of the stroke, the switching assembly drives the other filter plate 7 to be coaxial with the sleeve tube 3;

[0084] Step 5: The engaging wheel 17 is reset and drives the counterweight 24 to move. The counterweight 24 knocks the filter plate 7 to shake off the impurities on the filter plate 7.

[0085] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0086] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A symmetrical plate heat exchanger, characterized in that: include: A plate heat exchanger body (1), wherein a fluid inlet (2) is provided on the plate heat exchanger body (1); A sleeve pipe (3), connected to the plate heat exchanger body (1) and coaxial with the fluid inlet (2); A switching plate (6) is sealingly slidably disposed between the sleeve tube (3) and the fluid inlet (2), and two sets of filter plates (7) are detachably mounted on the switching plate (6); a switching assembly connected to the switching plate (6), wherein the switching assembly is capable of making one of the filter plates (7) coaxial with the fluid inlet (2); A pneumatic drive assembly is connected to the sleeve (3), and a mating wheel (17) is rotatably mounted on the pneumatic drive assembly; A drive plate (19) is connected to the switching assembly. A guide groove is formed on the drive plate (19). The guide groove cooperates with the engaging wheel (17) to drive the switching assembly to operate when the pressure in the sleeve tube (3) increases.

2. A symmetrical plate heat exchanger according to claim 1, characterized in that: Two groups of connecting plates (4) are symmetrically arranged on the plate heat exchanger body (1), the connecting plates (4) are connected to the sleeve pipe (3), and a guide member (5) is respectively arranged on one side opposite to the other of the two groups of connecting plates (4), and the guide member (5) is slidably connected to a guide groove (601) arranged on the switching plate (6); The switching assembly comprises an energy storage plate (12) connected to the switching plate (6) and an energy storage structure arranged on one of the groups of connecting plates (4); an abutment wheel (11) is rotatably mounted on the energy storage structure, and the abutment wheel (11) is capable of rolling along the side of the energy storage plate (12).

3. A symmetrical plate heat exchanger according to claim 2, characterized in that: Two groups of inclined surfaces (1201) are formed on one side of the energy storage plate (12) facing the abutment wheel (11), and an outer protrusion (1202) is provided at the connection between the two groups of inclined surfaces (1201); The energy storage structure comprises a slide groove (401) arranged along the length direction of the link plate (4), a slider (10) connected to the abutment wheel (11) being slidably mounted in the slide groove (401), and the slider (10) and the slide groove (401) are connected via a No. 1 spring (8).

4. A symmetrical plate heat exchanger according to claim 2, characterized in that: The pneumatic drive assembly comprises a sealing cylinder (13) connected to the sleeve (3), a convex ring (1301) is formed in the sealing cylinder (13), and a sealing plug (15) is sealingly slidably mounted in the sealing cylinder (13), a vertical shaft penetrating the sealing cylinder (13) is mounted on the sealing plug (15), and a No. 2 spring (14) is sleeved on the vertical shaft; One end of the vertical shaft away from the sealing plug (15) is connected to a connecting frame (16), and the connecting frame (16) is connected to the engaging wheel (17).

5. A symmetrical plate heat exchanger according to claim 1, characterized in that: The guide groove member comprises two groups of inclined grooves (1901), two groups of vertical grooves (1902), two groups of accommodating grooves (1903) and two groups of horizontal grooves (1904) symmetrically arranged on the driving plate (19), the two groups of inclined grooves (1901) intersecting, the two groups of vertical grooves (1902), the two groups of accommodating grooves (1903) and the two groups of horizontal grooves (1904) being respectively parallel; The horizontal groove (1904) is perpendicular to the vertical groove (1902), and the vertical groove (1902) and the containing groove (1903) are colinear; The guide groove member further comprises a deflection structure which is arranged on the drive plate (19) and is used to guide the engaging wheel (17) to directional roll.

6. A symmetrical plate heat exchanger according to claim 5, characterized in that: The deflection structure comprises a first switching member (20) rotatably mounted at one end of the vertical slot (1902) away from the horizontal slot (1904) and two groups of second switching members (21) rotatably mounted at the intersection of two groups of inclined slots (1901); The second switching member (21) is adapted to a stop surface (1905) formed on the driving plate (19).

7. A symmetrical plate heat exchanger according to claim 4, characterized in that: Two groups of connecting shafts (22) are symmetrically arranged on the connecting plate (4), a sleeve shaft (23) is rotatably sleeved on the connecting shaft (22), one end of the sleeve shaft (23) is connected to a counterweight block (24), and the other end is connected to an elastic plate (25), and the elastic plate (25) is adapted to be connected to an abutting shaft (18) connected to the connecting frame (16); A stopper set is provided between the sleeve shaft (23) and the connecting shaft (22).

8. A symmetrical plate heat exchanger according to claim 7, characterized in that: The stopper kit comprises a limiting portion (2201) arranged at the end of the connecting shaft (22), and the limiting portion (2201) is adapted to an arc-shaped notch (2301) arranged on the sleeve shaft (23).

9. A heat exchange method for a symmetrical plate heat exchanger according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Pipeline connection: the fluid to be heated / cooled needs to be connected to the sleeve pipe (3); Step 2: pumping the fluid to be heated / cooled through the sleeve pipe (3) into the plate heat exchanger body (1); Step 3: When impurities in the fluid to be heated / cooled clog the filter plate (7), the pneumatic drive assembly will be activated and drive the engaging wheel (17) to move along the guide groove, and at this time the switching assembly connected to the drive plate (19) will be activated; Step 4: When the engaging wheel (17) rises to the highest point of the stroke, the switching assembly drives the other filter plate (7) to be coaxial with the sleeve tube (3); Step 5: The engaging wheel (17) is reset and drives the counterweight (24) to move. The counterweight (24) knocks the filter plate (7) to shake off the impurities on the filter plate (7).

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