Heat exchange tube assembly and condensing evaporator

Abstract

The invention relates to the technical field of evaporators, in particular to a heat pipe assembly which comprises a plurality of heat exchange pipes installed in an evaporator shell, an inner pipe is movably installed in the center of the interior of each heat exchange pipe, the lower end of each inner pipe extends to the exterior of the lower end of the corresponding heat exchange pipe, and a plurality of arc-shaped scrapers are distributed on the outer wall of each inner pipe at equal intervals. A telescopic unfolding assembly is installed on the outer wall of the inner pipe and connected with a plurality of sets of arc-shaped scrapers, each set of arc-shaped scrapers is composed of a plurality of arc-shaped scraping pieces, and when the driving assembly drives the inner pipe to move downwards, the telescopic unfolding assembly is unfolded. When the arc-shaped scraping blades are attached to the inner wall of the heat exchange pipe, the driving assembly drives the inner pipe to move downwards and drives the arc-shaped scraping blades to move to scrape away materials on the inner wall of the heat exchange pipe, and the situation that the materials are attached to the inner wall of the heat exchange pipe is avoided; the heat conduction efficiency of the heat exchange tube is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of evaporators, in particular to a heat exchange tube assembly and a condensing evaporator. Background Art

[0002] Falling film evaporator is a thin film evaporator, which is mainly used in chemical industry, food processing, environmental protection engineering, agriculture and medicine and pharmaceutical fields. It is widely used in the field of food processing, mainly for the concentration of juice, dairy products, alcohol and other materials.

[0003] In the process of concentrated dairy products, the raw liquid of dairy products is preheated and then enters the heat exchange tube from the top of the evaporator through the liquid distribution device. Under the action of gravity, it flows down along the inner wall of the heat exchange tube in the form of a film and passes through the heat exchange cavity. By heating the outer wall of the heat exchange tube, the material is evaporated and concentrated. This design makes the falling film evaporator suitable for heat-sensitive materials, because the residence time of the material in the evaporator is short and it is not easy to cause material deterioration.

[0004] In the prior art, during evaporation, the dairy product to be concentrated will flow into the interior of the heat exchange tube, and the dairy product concentrate will adhere to the inner wall of the heat exchange tube. As the evaporation proceeds, the dairy product concentrate will partially dry and solidify on the inner wall of the heat exchange tube, increasing the wall thickness of the heat exchange tube, making it difficult for heat to contact the dairy product, and reducing the thermal conductivity of the heat exchange tube. In the long run, this will not only affect the thickness of the film-like flow of the dairy product through this part, but will also affect the flow direction of the dairy product.

[0005] In view of the above situation, in order to overcome the above technical problems, the present invention designs a heat exchange tube assembly and a condenser evaporator. Summary of the invention

[0006] The purpose of the present invention is to provide a heat exchange tube assembly and a condenser evaporator. During evaporation, the dairy product to be concentrated will flow into the interior of the heat exchange tube, and the dairy product concentrate will adhere to the inner wall of the heat exchange tube. As the evaporation proceeds, the dairy product concentrate will partially dry and solidify on the inner wall of the heat exchange tube, thereby increasing the wall thickness of the heat exchange tube. By providing a cleaning structure that can shrink inward and expand outward, the cleaning structure is driven to move up and down, thereby cleaning the raw materials adhered to the inner wall of the heat exchange tube, thereby preventing the adhesion of the dairy product from affecting the thermal conductivity of the heat exchange tube.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] The heat exchange tube assembly includes several groups of heat exchange tubes installed inside the evaporator casing, an inner tube is movably installed at the central part of the inside of each group of heat exchange tubes, the lower end of the inner tube extends to the outside of the lower end of the heat exchange tube, and several groups of arc scrapers are evenly distributed on the outer wall of the inner tube. A telescopic expansion assembly is installed on the outer wall of the inner tube, and the telescopic expansion assembly is connected to the several groups of arc scrapers. Each group of arc scrapers consists of several arc scrapers. A driving assembly for driving the inner tube to rise and fall is connected to the top of the heat exchange tube. The driving assembly drives the inner tube to move downward, so that the telescopic expansion assembly is expanded, and drives the several groups of arc scrapers to move and fit the inner wall of the heat exchange tube. The driving assembly drives the inner tube to move, so that the telescopic expansion assembly is expanded and contracted, and each group of arc scrapers is expanded or contracted.

[0009] Preferably, the telescopic and unfolding assembly includes a plurality of conical blocks corresponding to a plurality of groups of arc scrapers, the conical blocks are arranged at the centers of the corresponding arc scrapers, the conical blocks are fixedly sleeved on the outer wall of the inner tube, a movable ring is arranged under each of the conical blocks, the movable ring is movably sleeved on the outside of the inner tube, a swivel is rotatably connected to the outside of the movable ring, a plurality of elastic steel sheets are fixedly installed on the outer wall of each swivel, a plurality of the elastic steel sheets correspond to and are fixedly connected to a plurality of arc scrapers one by one, a plurality of connecting rods are fixedly installed on the lower end of each movable ring, the connecting rods movably pass through the conical block on the lower side and are fixedly connected to the movable ring on the lower side of the conical block, when the conical block descends and contacts the inner wall of the elastic steel sheet, the elastic steel sheet is driven to bend at the bending point, so that the elastic steel sheet drives the arc scraper fixedly connected at the upper end to expand or contract.

[0010] Preferably, a fixing ring is fixedly installed on the lower end of the connecting rod located at the lower end of the inner tube, a bottom spring is fixedly installed on the lower surface of the fixing ring, a fixing rod is movably installed inside the bottom spring, the upper end of the fixing rod is movably connected to the inside of the inner tube, the lower end of the fixing rod is fixedly installed on the bottom of the evaporator casing, a spring frame is fixedly installed on the outer wall of the fixing rod, the upper end of the spring frame is fixedly connected to the lower end of the bottom spring, and after the downward pressure disappears, the bottom spring pushes the upper part of the bottom spring to move and reset.

[0011] Preferably, the supporting force and rebound force generated by the bottom spring are greater than the sum of the elastic forces generated by a number of elastic steel sheets and the pressure generated by the gravity of the upper part of the bottom spring, which can drive the upper part of the bottom spring to move upward with the inner tube.

[0012] Preferably, a guide groove is provided around the outer wall of the conical block, the front end of the guide groove is connected with the rear end, the guide groove is composed of a plurality of inverted V-shaped grooves, and a plurality of groups of the V-shaped grooves are connected end to end. A sliding member is movably installed inside the guide groove, and the end fixing ring of the sliding member is on the outer wall of one side of one of the elastic steel sheets close to the guide groove.

[0013] Preferably, the inner angle between the two ends of the V-shaped groove is 120°. Of course, the inner angle between the two ends of the V-shaped groove can also be 72°.

[0014] Preferably, the upper end of the inner tube extends to the outside of the upper end of the heat exchange tube, and a tapered part is slidably sleeved on the outer wall of the inner tube at the upper side of the opening of the heat exchange tube. The upper end diameter of the tapered part is larger than the inner diameter of the heat exchange tube, and the lower end diameter of the tapered part is smaller than the inner diameter of the heat exchange tube. A support spring is movably sleeved on the outside of the inner tube, and the lower end of the support spring is fixedly connected to the upper end of the tapered part. A spring fixing frame is fixedly installed on the upper end of the support spring, and the spring fixing frame is fixedly installed on the outer wall of the inner tube. After the tapered part completely enters the interior of the heat exchange tube, it seals the opening of the heat exchange tube.

[0015] Preferably, the driving assembly includes two groups of movable brackets, and the two groups of movable brackets are respectively fixedly connected to a plurality of inner tubes. An electric push rod is provided on the upper side of each group of movable brackets, and the output end of the electric push rod is fixedly connected to the movable bracket on the lower side. The electric push rod is fixed to the inside of the evaporator casing through a mounting frame. The two independent groups of electric push rods can work alternately, and the driving equipment can be divided into two processing systems. When cleaning, one system can be cleaned separately, and the other system can perform evaporation and purification work, so that the equipment can be cleaned without stopping.

[0016] At the same time, the present invention also discloses a condensing evaporator, including an evaporator casing, the evaporator casing consists of an evaporator heating chamber in the middle and a top cover and a material collecting base that are detachably installed at the upper and lower ends, a feed port is installed on the outer surface of the top cover, and a discharge port is installed at the bottom of the material collecting base. The upper and lower ends of the evaporator heating chamber are fixedly installed with dividing plates for fixing heat exchange tubes, a heating device is fixedly installed on the inner wall of the evaporator heating chamber, and a condensing device is connected to the outside of the evaporator casing. The heating device can adopt steam heating method or electric heating method. The steam heating method can quickly diffuse heat and improve the uniformity of heating.

[0017] Preferably, the condensing device includes a condenser installed outside the evaporator casing, an air pump connected to the condenser is installed on the condenser, the air pump input end is fixedly installed and connected to an air pipe, the air pipe end extends to the inside of the evaporator casing and is fixedly connected and connected to a hose, the hose is connected to the inside of a number of inner tubes, the air pump can input hot steam into the condenser, and the water vapor inside the hot steam is condensed and collected through the operation of the condenser.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. When the driving component drives the inner tube to move downward, the telescopic expansion component expands, thereby driving the several arc-shaped scrapers of each group of arc-shaped scrapers to move outward and fit on the inner wall of the heat exchange tube. When the arc-shaped scrapers fit on the inner wall of the heat exchange tube, the driving component then drives the inner tube to move downward, driving the arc-shaped scrapers to move and scrape the materials on the inner wall of the heat exchange tube, so as to avoid the materials adhering to the inner wall of the heat exchange tube and reduce the heat conduction efficiency of the heat exchange tube.

[0020] 2. During the downward movement of the inner tube, the spring fixing frame is driven to apply pressure to the supporting spring. The elastic force generated by the supporting spring pushes the conical part completely into the upper opening of the heat exchange tube, thereby sealing the upper end of the heat exchange tube. This can prevent the dairy product concentrate from entering the interior of the heat exchange tube and affecting the cleaning work during the cleaning process.

[0021] 3. Set the cone to a cone shape with an upper diameter larger than the diameter of the heat exchange tube and a lower diameter smaller than the diameter of the heat exchange tube. During the downward movement of the cone, the gap between the cone and the diameter of the heat exchange tube can be controlled by controlling the position of the cone, so that the thickness of the material entering can be accurately controlled during the material input process. According to the required heat or different working modes for the concentration or drying of the material, the thickness of the material inflow can be adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure inside the evaporator casing of the present invention;

[0023] Figure 2 For the present invention Figure 1 The enlarged structural diagram at a in the middle;

[0024] Figure 3 It is a structural schematic diagram of the telescopic deployment component of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the movable ring of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the driving assembly of the present invention;

[0027] Figure 6 For the present invention Figure 5 The enlarged structural diagram at b in the middle;

[0028] Figure 7 It is a schematic diagram of the structure of the outer casing of the evaporator of the present invention;

[0029] Figure 8 It is a structural schematic diagram of the cleaning state of the present invention;

[0030] Fig. 9 It is a structural schematic diagram of the evaporation state of the present invention.

[0031] In the figure: 1. heat exchange tube; 2. evaporator casing; 21. evaporator heating chamber; 211. material dividing plate; 22. material collecting base; 221. discharge port; 23. top cover; 231. feed port; 24. heating device; 25. condensing device; 251. condenser; 252. air pump; 253. air pipe; 254. hose; 3. inner tube; 31. conical member; 32. support spring; 33. spring fixing frame; 4. telescopic expansion assembly; 41. conical block; 411. guide groove; 412. sliding member; 42. movable ring; 421. swivel; 422. connecting rod; 423. elastic steel sheet; 424. fixing ring; 425. bottom spring; 426. fixing rod; 427. spring frame; 5. arc scraper; 6. driving assembly; 61. movable bracket; 62. electric push rod. DETAILED DESCRIPTION

[0032] 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.

[0033] First embodiment:

[0034] See also Figure 1 The present invention provides a heat exchange tube assembly, and the technical solution is as follows:

[0035] The heat exchange tube assembly includes a plurality of groups of heat exchange tubes 1 installed inside the evaporator casing 2, an inner tube 3 is movably installed at the central part inside each group of heat exchange tubes 1, the lower end of the inner tube 3 extends to the outside of the lower end of the heat exchange tube 1, a plurality of groups of arc scrapers 5 are evenly distributed on the outer wall of the inner tube 3, a telescopic expansion assembly 4 is installed on the outer wall of the inner tube 3, the telescopic expansion assembly 4 is connected to the plurality of groups of arc scrapers 5, each group of arc scrapers 5 is composed of a plurality of arc scrapers, a driving assembly 6 for driving the lifting movement of the inner tube 3 is connected to the top of the heat exchange tube 1, the driving assembly 6 drives the inner tube 3 to move downward, so that the telescopic expansion assembly 4 is expanded, and the plurality of groups of arc scrapers 5 are driven to move and fit the inner wall of the heat exchange tube 1, when the driving assembly 6 drives the inner tube 3 to move downward, the telescopic expansion assembly 4 is expanded, thereby driving each group of Several arc-shaped scrapers of the arc-shaped scraper 5 move outward and fit on the inner wall of the heat exchange tube 1. When the arc-shaped scrapers fit on the inner wall of the heat exchange tube 1, the driving component 6 then drives the inner tube 3 to move downward, driving the arc-shaped scrapers to move and scrape the materials on the inner wall of the heat exchange tube 1; when the driving component 6 drives the inner tube 3 to move upward, it first drives the telescopic expansion component 4 to move to the starting position of the cleaning position, and then moves upward to make the telescopic expansion component 4 in the expanded state shrink inward to restore to the initial state, and drives the arc-shaped scrapers of each group of arc-shaped scrapers 5 to move and shrink to the initial position, so as to avoid contact with the inner wall of the heat exchange tube 1 after cleaning is completed, affecting the flow direction of the dairy product, and promoting the flow direction of the dairy product in the contracted state to avoid the dairy product from diffusing inward, thereby improving the heat exchange effect of the equipment.

[0036] As an embodiment of the present invention, refer to Figure 3 and Figure 4 The telescopic expansion assembly 4 includes a plurality of conical blocks 41 corresponding to a plurality of groups of arc scrapers 5. The conical blocks 41 are arranged at the center of the corresponding arc scrapers 5. The conical blocks 41 are fixedly sleeved on the outer wall of the inner tube 3. A movable ring 42 is arranged below each conical block 41. The movable ring 42 is movably sleeved on the outside of the inner tube 3. A swivel 421 is rotatably connected to the outside of the movable ring 42. A plurality of elastic steel sheets 423 are fixedly installed on the outer wall of each swivel 421. The elastic steel sheets 423 have bending points. When subjected to force, the elastic steel sheets 423 are fixedly mounted on the outer wall of the swivel 421. The elastic steel sheet 423 can be driven to bend at the bending point, so that the elastic steel sheet 423 drives the arc scraper fixedly connected at the upper end to expand or contract. A number of elastic steel sheets 423 correspond to and are fixedly connected to a number of arc scrapers one by one. A number of connecting rods 422 are fixedly installed at the lower end of each movable ring 42. The connecting rods 422 are movable through the conical block 41 on the lower side and are fixedly connected to the movable ring 42 on the lower side of the conical block 41. The connecting rods 422 are used to limit the spacing between the several movable rings 42 and support the several movable rings 42.

[0037] As an embodiment of the present invention, refer to Figure 2A fixing ring 424 is fixedly installed at the lower end of the connecting rod 422 located at the lower end of the inner tube 3, a bottom spring 425 is fixedly installed on the lower surface of the fixing ring 424, a fixing rod 426 is movably installed inside the bottom spring 425, the upper end of the fixing rod 426 is movably connected to the inside of the inner tube 3, the lower end of the fixing rod 426 is fixedly installed at the bottom of the evaporator casing 2, a spring frame 427 is fixedly installed on the outer wall of the fixing rod 426, the upper end of the spring frame 427 is fixedly connected to the lower end of the bottom spring 425, when the inner tube 3 is moved downward for cleaning, the upper end of the fixing rod 426 is inserted into the inner tube 3, The bottom of the inner tube 3 can be sealed to prevent hot steam from circulating inside the inner tube 3 in the cleaning state. The supporting force and rebound force generated by the bottom spring 425 are greater than the sum of the elastic forces generated by a number of elastic steel sheets 423 and the pressure generated by the gravity of the upper part of the bottom spring 425. The supporting force and rebound force of the bottom spring 425 are greater than the sum of the elastic forces generated by a number of elastic steel sheets 423 and the pressure generated by the gravity of the upper part of the bottom spring 425. They are used to support the pressure generated by the expansion of the arc scraper. After the downward pressure disappears, the bottom spring 425 pushes the upper part of the bottom spring 425 to move and reset.

[0038] As an embodiment of the present invention, refer to Figure 3 A guide groove 411 is provided around the outer wall of the conical block 41, and the front end of the guide groove 411 is connected with the rear end. The guide groove 411 is composed of a plurality of inverted V-shaped grooves, and a plurality of groups of V-shaped grooves are connected end to end. A sliding member 412 is movably installed inside the guide groove 411, and the end fixing ring of the sliding member 412 is on the outer wall of one side of one elastic steel sheet 423 close to the guide groove 411. The sliding member 412 moves along the inverted V-shaped groove inner wall as a path. The sliding member 412 contacts the downward V-shaped groove inner wall, and can generate a force to drive the rotating sliding member 412, the elastic steel sheet 423 and the rotating ring 421 to rotate outside the movable ring 42, so as to adjust the cleaning angle of the arc scraper 5.

[0039] As an embodiment of the present invention, refer to Figure 3 The internal angle between the two ends of the V-shaped groove is 120°. By setting the internal angle between the two ends of the V-shaped groove to 120°, a small number of cleaning times can be used to completely cover the inner wall of the entire heat exchange tube 1.

[0040] As an embodiment of the present invention, refer to Figure 5 and Figure 6The upper end of the inner tube 3 extends to the outside of the upper end of the heat exchange tube 1, and a conical part 31 is slidably sleeved on the outer wall of the inner tube 3 on the upper side of the opening of the heat exchange tube 1. The upper end diameter of the conical part 31 is larger than the inner diameter of the heat exchange tube 1, and the lower end diameter of the conical part 31 is smaller than the inner diameter of the heat exchange tube 1. A supporting spring 32 is movably sleeved on the outside of the inner tube 3, and the lower end of the supporting spring 32 is fixedly connected to the upper end of the conical part 31. The upper end of the supporting spring 32 is fixedly installed with a spring fixing frame 33, and the spring fixing frame 33 is fixedly installed on the outer wall of the inner tube 3. In the process of the inner tube 3 moving downward, the spring fixing frame 33 is driven to apply pressure to the supporting spring 32, and the elastic force generated by the supporting spring 32 completely pushes the conical part 31 into the upper end opening of the heat exchange tube 1, thereby sealing the upper end of the heat exchange tube 1, which can prevent the dairy product concentrate from entering the interior of the heat exchange tube 1 and affecting the cleaning work in the cleaning state;

[0041] The conical member 31 is set to be a cone with an upper diameter larger than the diameter of the heat exchange tube 1 and a lower diameter smaller than the diameter of the heat exchange tube 1. During the downward movement of the conical member 31, the gap between the conical member 31 and the diameter of the heat exchange tube 1 can be controlled by controlling the position of the conical member 31, so that the thickness of the material entering can be accurately controlled during the material input process, and different working modes can be adjusted for the concentration or drying of the material to adjust the thickness of the material inflow;

[0042] Furthermore, at the beginning of material input, the top of the heat exchange tube 1 can be closed, and when the material is completely diffused around the heat exchange tube 1, the cone 31 is opened to allow the material to enter the inner wall of the heat exchange tube 1 evenly.

[0043] As an embodiment of the present invention, refer to Figure 1 , Figure 5 , Figure 8 and Fig. 9 The driving assembly 6 includes two groups of movable brackets 61, and the two groups of movable brackets 61 are fixedly connected to the plurality of inner tubes 3 respectively. An electric push rod 62 is arranged on the upper side of each group of movable brackets 61, and the output end of the electric push rod 62 is fixedly connected to the movable bracket 61 on the lower side. The electric push rod 62 is fixed to the inside of the evaporator casing 2 through a mounting frame. By arranging two groups of electric push rods 62, they can work alternately to adjust the alternating cleaning work of the plurality of heat exchange tubes 1, thereby avoiding the need to completely shut down the equipment during the cleaning work.

[0044] At the same time, the present invention also discloses a condenser evaporator, referring to Figure 1 , Figure 5 and Figure 7, including an evaporator casing 2, the evaporator casing 2 is composed of an evaporator heating chamber 21 in the middle, a top cover 23 and a material collecting base 22 which are detachably installed at the upper and lower ends, a material inlet 231 is installed on the outer surface of the top cover 23, and a discharge port 221 is installed at the bottom of the material collecting base 22. The upper and lower ends of the evaporator heating chamber 21 are fixedly installed with dividing plates 211 for fixing the heat exchange tube 1, and a heating device 24 is fixedly installed on the inner wall of the evaporator heating chamber 21. The heating device 24 can adopt steam heating or electric heating. The steam heating method can quickly diffuse heat and improve the uniformity of heating. The steam heating device is a steam pipe installed in the evaporator heating chamber 21 and connected to the inside of the evaporator heating chamber 21. The steam pipe is connected to an external steam engine. The steam engine generates steam when working, and the steam pipe guides the steam to the inside of the evaporator heating chamber 21. The outside of the evaporator casing 2 is connected to a condensing device 25.

[0045] As an embodiment of the present invention, refer to Figure 5 and Figure 7 The condensing device 25 includes a condenser 251 installed outside the evaporator housing 2, an air pump 252 connected to the condenser 251 is installed on the condenser 251, the input end of the air pump 252 is fixedly installed and connected with an air pipe 253, and the hose 254 can move. When the electric push rod 62 is working, it plays a role in connecting the inner tube 3 and the air pipe 253. The end of the air pipe 253 extends to the inside of the evaporator housing 2 and is fixedly connected and connected with the hose 254. The hose 254 is connected with the inside of a plurality of inner tubes 3. During operation, the air is pumped by the working air pump 252. Negative pressure is generated inside the tube 253 and the hose 254, which in turn generates negative pressure inside the inner tubes 3, and the hot steam generated by evaporation can be sucked into the air pipe 253 and the hose 254 through the bottom of the inner tube 3. In this process, the hot steam will pass through the inner tube 3 and dissipate heat from the center of the heat exchange tube 1 to preheat the material that initially enters the heat exchange tube 1, thereby improving the thermal utilization rate and reducing energy consumption. The air pump 252 can input the hot steam into the condenser 251, and the water vapor inside the hot steam is condensed and collected through the operation of the condenser 251.

[0046] Working principle:

[0047] In the first working state, the output end of the electric push rod 62 moves upward:

[0048] In order to realize the non-stop cleaning of the equipment, two groups of electric push rods 62 that can work alternately are provided, which respectively drive two movable brackets 61 to adjust the positions of the two groups of inner tubes 3 (when one group of electric push rods 62 moves downward, the other group of electric push rods 62 can be in a standby state), and adjust the alternating cleaning of a plurality of heat exchange tubes 1. The output end of one of the electric push rods 62 drives the movable bracket 61 fixedly connected thereto to move downward, so that a plurality of inner tubes 3 fixed on the movable bracket 61 move downward synchronously, thereby driving the spring fixing bracket 33 to apply pressure to the support spring 32. The elastic force generated by the support spring 32 pushes the conical member 31 that is slidably connected to the outer wall of the inner tube 3 to completely enter the upper end opening of the heat exchange tube 1, thereby sealing the upper end of the heat exchange tube 1, and adjusting the state of the group of heat exchange tubes 1 to the cleaning state;

[0049] In order to realize the cleaning work of the equipment, as the inner tube 3 moves downward, the conical block 41 is driven to move downward, so that the outer wall of the conical block 41 contacts the inner wall of the elastic steel sheet 423, and the elastic steel sheet 423 is squeezed, which can drive the elastic steel sheet 423 to expand outward at the bending point, and then drive the arc scraper fixed on the upper end of the elastic steel sheet 423 to expand outward until it fits on the inner wall of the heat exchange tube 1, and the adjustment of the cleaning state is completed (before the elastic steel sheet 423 bends and deforms to drive the arc scraper to fully expand, the bottom spring 425 supports the connecting rod 422, the movable ring 42, and the rotating ring 421 in a static state. As the state adjustment is completed, the pressure on the bottom spring 425 increases, and the bottom spring 425 is compressed);

[0050] In order to compensate for the gap generated when the arc scraper is unfolded, when the conical block 41 drives the elastic steel sheet 423 to unfold, the sliding member 412 moves along the guide groove 411 (composed of a plurality of V-shaped grooves) arranged on the outer surface of the conical block 41, and the sliding member 412 contacts the inner wall of the downwardly moved guide groove 411. The contact with the sliding member 412 during the movement of the guide groove 411 can generate an inclined thrust, driving the elastic steel sheet 423 and the rotating ring 421 to rotate outside the movable ring 42, so as to adjust the cleaning angle of the arc scraper 5, thereby covering the gap generated when the arc scraper 5 is unfolded, and completely cleaning the inner wall of the heat exchange tube 1.

[0051] Then, the inner tube 3 is driven to move downward, and the thrust generated is greater than the supporting force generated by the bottom spring 425, so that the bottom spring 425 is compressed, which can drive the connecting rod 422, the movable ring 42, the rotating ring 421, the elastic steel sheet 423, and the arc scraper 5 to move downward to scrape the inner wall of the heat exchange tube 1 to prevent the heat exchange tube 1 from adhering to the material and affecting the heat conduction efficiency. The downward moving path of the arc scraper 5 can cover the changing moving path of the arc scraper 5 below. Through the synchronous movement of multiple groups of arc scrapers 5, the depth of the heat exchange tube 1 can be completely covered to clean the heat exchange tube 1.

[0052] In the second working state, the output end of the electric push rod 62 moves upward and resets:

[0053] In order not to affect the flow path of the material and the evaporation and purification work, the electric push rod 62 can drive the inner tube 3 to move upward. During the movement, the rebound force of the bottom spring 425 can drive the connecting rod 422, the movable ring 42, the rotating ring 421, the elastic steel sheet 423, and the arc scraper 5 to move to the starting position of the cleaning part, and this position is the limit of the rebound position of the bottom spring 425. The inner tube 3 continues to move upward, driving the conical block 41 to separate from the inner walls of the elastic steel sheets 423, so that the elastic steel sheets 423 rebound and shrink toward the center of the inner tube 3, and then driving the arc scraper 5 to separate from the inner wall of the heat exchange tube 1, thereby shrinking the arc scraper 5 to avoid affecting the flow path of the liquid;

[0054] During the process of the conical block 41 moving upward and separating from the elastic steel sheet 423, the sliding member 412 moves along the inverted inner wall of the V-shaped groove as a path. The sliding member 412 contacts the inner wall of the upward V-shaped groove, which can generate a force to drive the rotating sliding member 412, the elastic steel sheet 423 and the rotating ring 421 to rotate outside the movable ring 42, so as to adjust the cleaning angle of the arc scraper 5. While the inner tube 3 reciprocates up and down to complete a cleaning work, the sliding member 412 will move along a set of internal paths of the V-shaped groove.

[0055] The first working state and the second working state are cycled through, and the inner wall of the heat exchange tube 1 can be cleaned.

[0056] During heat exchange, a steam pipe is installed inside the evaporator heating chamber 21 and is connected to an external steam engine. The steam engine generates steam and guides the steam into the evaporator heating chamber 21 through the steam pipe, and the steam is wrapped around the outside of the heat exchange tube 1 to heat the inside of the heat exchange tube 1.

[0057] During the downward movement of the inner tube 3, the spring fixing frame 33 is driven to apply pressure to the supporting spring 32, and the elastic force generated by the supporting spring 32 completely pushes the conical member 31 into the upper end opening of the heat exchange tube 1, thereby sealing the upper end of the heat exchange tube 1, and preventing the raw dairy liquid from entering the interior of the heat exchange tube 1 and affecting the cleaning work during the cleaning state;

[0058] The conical member 31 is set to be a cone with an upper diameter larger than the diameter of the heat exchange tube 1 and a lower diameter smaller than the diameter of the heat exchange tube 1. During the downward movement of the conical member 31, the gap between the conical member 31 and the diameter of the heat exchange tube 1 can be controlled by controlling the position of the conical member 31, so that the thickness of the material entering can be accurately controlled during the material input process, and different working modes can be adjusted for the concentration or drying of the material to adjust the thickness of the material inflow;

[0059] Furthermore, at the beginning of material input, the top of the heat exchange tube 1 can be closed, and when the material is completely diffused around the heat exchange tube 1, the cone 31 is opened to allow the material to enter the inner wall of the heat exchange tube 1 evenly.

[0060] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heat exchange tube assembly, characterized in that: The invention comprises a plurality of groups of heat exchange tubes (1) installed inside an evaporator casing (2), an inner tube (3) being movably installed at the central part inside each group of the heat exchange tubes (1), the lower end of the inner tube (3) extending to the outside of the lower end of the heat exchange tube (1), a plurality of groups of arc scrapers (5) being evenly distributed on the outer wall of the inner tube (3), a telescopic expansion component (4) being installed on the outer wall of the inner tube (3), the telescopic expansion component (4) being connected to the plurality of groups of arc scrapers (5), each group of the arc scrapers (5) being composed of a plurality of arc scrapers, a driving component (6) for driving the inner tube (3) to move up and down being connected to the top of the heat exchange tube (1), the driving component (6) driving the inner tube (3) to move downward, causing the telescopic expansion component (4) to expand, and driving the plurality of groups of arc scrapers (5) to move and fit the inner wall of the heat exchange tube (1).

2. The heat exchange tube assembly according to claim 1, characterized in that: The telescopic expansion assembly (4) comprises a plurality of conical blocks (41) corresponding one to one with a plurality of groups of arc-shaped scrapers (5). The conical blocks (41) are arranged at the center of the corresponding arc-shaped scrapers (5). The conical blocks (41) are fixedly sleeved on the outer wall of the inner tube (3). A movable ring (42) is arranged below each of the conical blocks (41). The movable ring (42) is movably sleeved on the outside of the inner tube (3). A rotating ring (421) is rotatably connected to the outside of the movable ring (42). A plurality of elastic steel sheets (423) are fixedly mounted on the outer wall of each rotating ring (421). The plurality of elastic steel sheets (423) correspond one to one with and are fixedly connected to the plurality of arc-shaped scrapers. A plurality of connecting rods (422) are fixedly mounted on the lower end of each of the movable rings (42). The connecting rods (422) movably pass through the conical block (41) on the lower side and are fixedly connected to the movable ring (42) on the lower side of the conical block (41).

3. The heat exchange tube assembly according to claim 2, characterized in that: A fixing ring (424) is fixedly mounted on the lower end of the connecting rod (422) located at the lower end of the inner tube (3); a bottom spring (425) is fixedly mounted on the lower surface of the fixing ring (424); a fixing rod (426) is movably mounted inside the bottom spring (425); the upper end of the fixing rod (426) is movably connected to the inside of the inner tube (3); the lower end of the fixing rod (426) is fixedly mounted on the bottom of the evaporator casing (2); a spring frame (427) is fixedly mounted on the outer wall of the fixing rod (426); the upper end of the spring frame (427) is fixedly connected to the lower end of the bottom spring (425).

4. The heat exchange tube assembly according to claim 3, characterized in that: The supporting force and the rebound force generated by the bottom spring (425) are greater than the sum of the elastic forces generated by the elastic steel sheets (423) and the pressure generated by the gravity of the upper part of the bottom spring (425).

5. The heat exchange tube assembly according to claim 4, characterized in that: A guide groove (411) is formed around the outer wall of the conical block (41), the front end of the guide groove (411) is connected to the rear end, the guide groove (411) is composed of a plurality of inverted V-shaped grooves, the V-shaped grooves in the guide groove (411) are connected end to end, a sliding member (412) is movably installed inside the guide groove (411), and the end fixing ring of the sliding member (412) is on the outer wall of one side of one of the elastic steel sheets (423) close to the guide groove (411).

6. The heat exchange tube assembly according to claim 5, characterized in that: The inner angle between the two ends of the V-shaped groove in the guide groove (411) is 120°.

7. The heat exchange tube assembly according to claim 6, characterized in that: The upper end of the inner tube (3) extends to the outside of the upper end of the heat exchange tube (1); a conical member (31) is slidably sleeved on the outer wall of the inner tube (3) and located on the upper side of the opening of the heat exchange tube (1); the diameter of the upper end of the conical member (31) is larger than the inner diameter of the heat exchange tube (1); the diameter of the lower end of the conical member (31) is smaller than the inner diameter of the heat exchange tube (1); a support spring (32) is movably sleeved on the outside of the inner tube (3); the lower end of the support spring (32) is fixedly connected to the upper end of the conical member (31); a spring fixing frame (33) is fixedly installed on the upper end of the support spring (32); and the spring fixing frame (33) is fixedly installed on the outer wall of the inner tube (3).

8. The heat exchange tube assembly according to claim 7, characterized in that: The driving assembly (6) comprises two groups of movable brackets (61), the two groups of movable brackets (61) are respectively fixedly connected to a plurality of inner tubes (3), an electric push rod (62) is provided on the upper side of each group of movable brackets (61), an output end of the electric push rod (62) is fixedly connected to the movable bracket (61) on the lower side, and the electric push rod (62) is fixed inside the evaporator casing (2) through a mounting frame.

9. A condenser evaporator, comprising the heat exchange tube assembly according to any one of claims 1 to 8, characterized in that: The evaporator casing (2) comprises an evaporator heating chamber (21) in the middle, a top cover (23) and a material collecting base (22) which are detachably mounted at the upper and lower ends, a material inlet (231) being mounted on the outer surface of the top cover (23), a material outlet (221) being mounted at the bottom of the material collecting base (22), a material dividing plate (211) for fixing a heat exchange tube (1) being fixedly mounted at the upper and lower ends of the evaporator heating chamber (21), a heating device (24) being fixedly mounted on the inner wall of the evaporator heating chamber (21), and a condensing device (25) being connected to the outside of the evaporator casing (2).

10. The condenser evaporator according to claim 9, characterized in that: The condensing device (25) comprises a condenser (251) installed outside the evaporator casing (2); an air pump (252) connected to the condenser (251) is installed on the condenser (251); the input end of the air pump (252) is fixedly installed and connected to an air pipe (253); the end of the air pipe (253) extends to the inside of the evaporator casing (2) and is fixedly connected and connected to a hose (254); the hose (254) is connected to the inside of a plurality of inner tubes (3).

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