A low temperature heat pump sludge drying machine for sludge dehydration

Abstract

The present invention discloses a low-temperature heat pump sludge dryer for sludge dehydration, comprising a working box, wherein one side of the top of the working box is connected to a feed hopper, the other side of the bottom of the working box is connected to a discharge hopper, a heat exchange component is arranged in the middle of the inner side of the working box, the heat exchange component comprises a C-shaped air duct, a plurality of C-shaped air ducts are arranged and are evenly distributed along a conveyor belt-shaped track, adjacent C-shaped air ducts are connected by a connecting belt, an inner air duct is penetrated in the middle of the C-shaped air duct, an inner air duct port is opened on the outer periphery of the inner air duct, and the inner air duct port is arranged in a multi-layer annular array, which further improves the contact degree with the sludge and the heat exchange efficiency, further reduces the residue, and further maintains the output rate of the dried sludge on the basis of maintaining the stable working efficiency of the heat exchange component, overcomes the inevitable disadvantages of the mesh conveyor belt, and maintains the stable and efficient heat exchange efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of low-temperature drying, in particular to a low-temperature heat pump sludge drying machine for sludge dehydration. Background Art

[0002] Low-temperature heat pump sludge dryer is a kind of equipment used for sludge treatment. Its working principle is mainly to achieve sludge drying through two processes: heat transfer and mass transfer. The drying belt contacts the sludge to evaporate the moisture in the sludge. The sludge residue on the drying belt and the waste gas generated in the drying process are discharged together through the ventilation system. At the same time, fresh air is introduced to keep the internal environment of the equipment good.

[0003] The application document with publication number CN115784557A discloses a belt dryer, including a drying chamber, an upper drying mesh belt arranged above the interior of the drying chamber, and a lower drying mesh belt arranged below the interior of the drying chamber, an air supply duct is formed between the upper drying mesh belt and the lower drying mesh belt, and a side wall of the drying chamber has an air inlet connected to the air supply duct.

[0004] The above device has the following shortcomings: when in use, the mesh holes are easily clogged with sludge, and the heat exchange efficiency decreases with the length of time used. The above device cannot improve the contact efficiency between the airflow and the sludge, and the overall working efficiency is low. At the same time, the above device is prone to the adhesion of sludge, which causes a lot of dust to escape from the bottom surface of the device, making it difficult to clean and maintain. Summary of the invention

[0005] The purpose of the present invention is to provide a low-temperature heat pump sludge dryer for sludge dehydration in view of the above-mentioned problems and shortcomings, thereby improving the overall working efficiency.

[0006] The present invention solves at least one of the following technical problems:

[0007] (1) The above device is prone to sludge clogging the mesh when in use, and the heat exchange efficiency decreases with the length of use;

[0008] (2) The above device cannot improve the contact efficiency between airflow and sludge, and the overall working efficiency is low;

[0009] (3) The above-mentioned device is prone to the accumulation of sludge, which causes a lot of dust to escape from the floor of the device, making it difficult to clean and maintain.

[0010] The purpose of the present invention can be achieved through the following technical scheme: a low-temperature heat pump sludge dryer for sludge dehydration, including a working box, one side of the top of the working box is connected to a feed hopper, the other side of the bottom of the working box is connected to a discharge hopper, a heat exchange component is provided in the middle of the inner side of the working box, the heat exchange component includes a C-shaped air duct, a plurality of C-shaped air ducts are provided and are evenly distributed along a conveyor belt-shaped track, adjacent C-shaped air ducts are connected by connecting belts, an inner air duct is penetrated in the middle of the C-shaped air duct, an inner air duct port is opened on the outer periphery of the inner air duct, and the inner air duct port is arranged in a multi-layer annular array.

[0011] As a further solution of the invention, a dehumidifier box is provided at the top center of the working box, a dehumidifier fan is provided inside the dehumidifier box, the bottom of the dehumidifier box is connected to the working box, a dust-proof mesh plate is provided at the bottom port of the dehumidifier box, and a scraper for leveling and thickening the sludge is provided at the outlet of the feed hopper.

[0012] As a further scheme of the invention, a heat pump dehumidifier and a heat pump heat exchanger are provided on the top of the working box and on one side of the dehumidifier box. The heat pump dehumidifier is respectively connected to the dehumidifier box and the heat pump heat exchanger, and the heat pump heat exchanger is connected to the heat exchange component through an exhaust pipe. A dust removal conveyor belt is provided at the bottom inner side of the working box, a dust removal brush cylinder is provided on the lower side of one end of the heat exchange component close to the discharge hopper, and a scraper bar is provided at the end of the dust removal conveyor belt located above the discharge hopper to scrape off dust attached to the belt surface.

[0013] As a further scheme of the invention, the heat exchange assembly also includes an outer air guide cover plate, which is respectively arranged on both sides of the C-shaped air guide duct, and an inner air guide cover plate is arranged between the outer air guide cover plates, both ends of the C-shaped air guide duct are fixedly connected with sealing sliding belts, and both ends of the C-shaped air guide duct respectively pass through the connected sealing sliding belts, the sealing sliding belts, the inner air guide cover plate and the outer air guide cover plate correspond to each other one by one, and the two side edges of the sealing sliding belt are respectively sealed and slidably connected with the inner air guide cover plate and the outer air guide cover plate.

[0014] As a further solution of the invention, the port of the exhaust pipe passes through the outer air guide cover plate, and a support rod is provided on the lower side of the end surface of the exhaust pipe, and the support rod is fixedly connected to the exhaust pipe and the inner air guide cover plate respectively.

[0015] As a further scheme of the invention, both ends of the outer air guide cover plate and the inner air guide cover plate are semicircular and coaxial in center, and transmission shafts are provided at the centers of both ends of the inner air guide cover plate. Both ends of the transmission shaft penetrate the inner air guide cover plate and the outer air guide cover plate and maintain a sealed rotation connection, and both ends of the transmission shaft are fixedly sleeved with transmission gears, which are meshed with several C-shaped air guide tubes located at the ends of the inner air guide cover plate, and the transmission shaft is rotated by a driving motor.

[0016] As a further solution of the invention, both sides of the end of the C-shaped air guide tube are rotatably connected to limit rollers, and the limit rollers are respectively rollingly connected to the outer air guide cover plate and the inner air guide cover plate.

[0017] As a further scheme of the invention, a sealing frame is fixedly connected to the upper middle side of the C-shaped air guide tube, and the sealing frame cover is arranged on the outer side of the inner air guide tube. The outer periphery of each inner air guide tube is sealed and movably sleeved with an outer sealing tube, and a reset spring is provided on the inner side of the top of the outer sealing tube, and the two ends of the reset spring are respectively fixedly connected to the outer sealing tube and the inner air guide tube, and a receiving plate is provided on the outer periphery of the outer sealing tube, and the lower end of the outer sealing tube passes through the receiving plate and is sealed and fixedly connected to the receiving plate, the outer periphery of the receiving plate is sealingly and slidably connected to the inner periphery of the sealing frame, and an external air guide port is opened on the outer periphery of the middle part of the outer sealing tube.

[0018] As a further solution of the invention, there are several external air guide ports evenly distributed in a multi-layer annular array, the external air guide ports correspond to the internal air guide ports one by one, and an elastic patch is provided on the outside of the external air guide ports, the upper end of the elastic patch is fixedly connected to the outer sealing tube and the lower end is abutted against the outer sealing tube.

[0019] As a further solution of the invention, support columns are fixedly connected to the upper sides of both ends of the C-shaped air duct, and fan-shaped baffles are fixedly connected to both sides of the support columns. The lower ends of the fan-shaped baffles are abutted against the connecting belts, and the width of the lower ends of the fan-shaped baffles is at least one-half of the spacing between adjacent support columns.

[0020] Beneficial effects of the present invention:

[0021] (1) Dry hot air is uniformly guided to each inner air duct through the C-shaped air duct, and then evenly blown out to each layer and each location of the sludge through each inner air duct port. The sludge is contained and conveyed by the conveyor belt structure formed by the C-shaped air duct and the connecting belt, eliminating the disadvantages of the mesh conveyor belt, preventing the sludge from blocking the mesh, and reducing the amount of sludge residue in the device itself. Through the inner air duct and the inner air duct port, the hot air can fully contact with each location and each layer of the sludge carried during heat exchange, further improving the contact degree with the sludge and the heat exchange efficiency, thereby improving the heat exchange efficiency and dehumidification efficiency;

[0022] (2) During operation, the transmission shaft is driven to rotate, synchronously rotating each transmission gear. The transmission gear continuously moves each C-shaped air duct to transfer the sludge from the feed hopper to the discharge hopper. At the same time, the sludge is evenly and regularly laid on the heat exchange component through the feed hopper. The dehumidification fan guides the sludge so that the water vapor follows the air flow through the dehumidification box and enters the heat pump dehumidifier. The heat pump dehumidifier cools and liquefies the water vapor in the air flow to dehumidify and dry the collected water, and then sends the dry air into the heat pump heat exchanger. The heat absorbed by the heat pump dehumidifier is exchanged with the dry air again through the heat pump heat exchanger to form dry high-temperature air, which is then introduced into the heat exchange component through the exhaust pipe. The dry high-temperature airflow is transported to the chamber formed by the outer air guide plate and the inner air guide plate, so that it can be evenly distributed. The dry heat flow is transported and diverted to each C-shaped air duct, and through each inner air duct, the dry heat flow is divided into multiple layers and multiple strands of fine airflows with three-dimensional distribution and spread in the sludge, so that the water vapor in the sludge fully absorbs heat and evaporates, thereby forming a circular flow cycle, and the water vapor enriches the water in the sludge in the heat pump dehumidifier with the help of the above circulation. Then the heat exchange component guides the dry sludge into the discharge hopper, and further removes the attached mud and dust through the dust removal brush cylinder to prevent the air path from being blocked. The dust conveyor belt again receives the dust that is scattered and settled in the air in the box, and transports it to the discharge hopper for discharge, further reducing the residue, and further maintaining the output rate of dry sludge on the basis of maintaining the stable working efficiency of the heat exchange component, shortening the maintenance time;

[0023] (3) During operation, with the help of the elastic force of the return spring, the receiving plate moves to the upper end of the sealing frame, the outer air port and the inner air port are separated, the elastic patch is tightly attached to the outer air port, and the outer sealing tube and the inner air pipe remain sealed, thereby reducing heat loss and preventing dust from clogging the outer air port and the inner air port, keeping the air path unobstructed. When sludge falls on the heat exchange component, the weight of the sludge presses down the receiving plate, and then moves down the outer sealing tube, so that the outer air port and the inner air port are connected. Under the blowing of the heat flow, a gap appears between the elastic patch and the outer air port, so that the air flow is evenly dispersed into the sludge. At the same time, the elastic patch prevents the sludge from The particles enter the outer air port, and the air path is kept unobstructed during operation. When the dry sludge blocks break away and fall into the discharge hopper, the various components are reset under the elastic force of the reset spring, and the outer air port is separated from the inner air port. The outer sealing tube seals the inner air tube again, and the elastic patch abuts against the side wall of the outer sealing tube to protect the outer air port, further keeping the air path from being blocked by sludge, overcoming the inevitable shortcomings of the mesh conveyor belt, and maintaining stable and efficient heat exchange efficiency. At the same time, the fan-shaped baffle is used to block the two sides of the sludge to prevent the sludge from scattering, ensuring the cleanliness of the working box, reducing the difficulty and time of maintenance, and promoting universality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0025] Figure 1 It is a three-dimensional view of the overall structure of the present invention;

[0026] Figure 2 It is a front view of the internal structure of the present invention;

[0027] Figure 3 for Figure 2 A magnified schematic diagram of the middle A area;

[0028] Figure 4 It is a cross-sectional view of the overall structure of the heat exchange assembly of the present invention;

[0029] Figure 5 for Figure 4 A magnified schematic diagram of the middle B area;

[0030] Figure 6 for Figure 4 Enlarged schematic diagram of the middle C area;

[0031] Figure 7 A three-dimensional view of a local structure of a heat exchange component of the present invention;

[0032] In the figure: 101, working box; 102, feeding hopper; 103, heat exchange assembly; 104, discharging hopper; 105, dust conveyor belt; 201, dehumidifying box; 202, heat pump dehumidifier; 203, heat pump heat exchanger; 204, exhaust pipe; 205, dust brush cylinder; 206, dehumidifying fan; 207, dust screen; 301, C-shaped air duct; 302, connecting belt; 303, external guide Air cover plate; 304, inner air guide cover plate; 305, sealing slide belt; 306, limiting roller; 307, support rod; 308, transmission gear; 309, transmission shaft; 401, sealing frame; 402, inner air guide pipe; 403, outer sealing cylinder; 404, return spring; 405, receiving plate; 406, inner air guide port; 407, outer air guide port; 501, support column; 502, fan-shaped baffle. DETAILED DESCRIPTION

[0033] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0034] See also Figure 1-7As shown: a low-temperature heat pump sludge dryer for sludge dehydration, comprising a working box 101, one side of the top of the working box 101 is connected to a feed hopper 102, the other side of the bottom of the working box 101 is connected to a discharge hopper 104, a heat exchange component 103 is provided in the middle of the inner side of the working box 101, the heat exchange component 103 comprises a C-shaped air duct 301, a plurality of C-shaped air ducts 301 are provided and are evenly distributed along a conveyor belt-shaped track, adjacent C-shaped air ducts 301 are connected by a connecting belt 302, an inner air duct 402 is penetrated in the middle of the C-shaped air duct 301, an inner air duct port 406 is provided on the outer periphery of the inner air duct 402, and the inner air duct port 406 is arranged in a multi-layer annular array;

[0035] When the present embodiment is working, the C-shaped air duct 301 and the connecting belt 302 rotate along the conveyor belt track and first receive the sludge from the feed hopper 102, and then transfer it to the discharge hopper 104. During the transfer process, the heat exchange component 103 is used to perform low-temperature thermal dehydration, and the heat is exchanged to the moisture in the sludge, so that the moisture in the sludge absorbs heat and evaporates faster, and then the dried sludge is discharged through the discharge hopper 104. When the heat exchange component 103 is working, the dry hot air is evenly guided to each inner air duct 402 through the C-shaped air duct 301, and then evenly blown out to each layer and each place of the sludge through each inner air port 406, so as to fully exchange heat and discharge water vapor.

[0036] A dehumidifying box 201 is provided at the top center of the working box 101. A dehumidifying fan 206 is provided in the dehumidifying box 201. The bottom of the dehumidifying box 201 is connected to the working box 101. A dust-proof screen 207 is provided at the bottom port of the dehumidifying box 201.

[0037] A heat pump dehumidifier 202 and a heat pump heat exchanger 203 are provided on the top of the working box 101 and on one side of the dehumidifying box 201. The heat pump dehumidifier 202 is connected to the dehumidifying box 201 and the heat pump heat exchanger 203 respectively. The heat pump heat exchanger 203 is connected to the heat exchange component 103 through the exhaust pipe 204. A dust conveyor belt 105 is provided at the bottom of the inner side of the working box 101. A dust removal brush cylinder 205 is provided at the lower side of one end of the heat exchange component 103 close to the discharge hopper 104.

[0038] The outlet of the feed hopper 102 is provided with a scraper for leveling and thickening the sludge, and one end of the dust conveyor belt 105 located above the discharge hopper 104 is provided with a scraper for scraping off the dust attached to the belt surface;

[0039] When the present embodiment is working, the sludge is evenly and fixedly laid on the heat exchange component 103 through the feed hopper 102, and the drying heat flow transported by the exhaust pipe 204 is divided into multiple layers and multiple strands of fine airflows in a three-dimensional distribution through the heat exchange component 103, so that the water vapor in the sludge can fully absorb heat and evaporate, and the water vapor is guided by the dehumidification fan 206 so that the water vapor follows the air flow through the dehumidification box 201 and enters the heat pump dehumidifier 202, and the heat pump dehumidifier 202 cools and liquefies the water vapor in the air flow to dehumidify, dry and collect water, and then sends the dry air to the heat pump heat exchanger 203, and the heat pump heat exchanger 206 is used to heat the sludge. The heat exchanger 203 exchanges the heat absorbed by the heat pump dehumidifier 202 to the dry air again to form dry high-temperature air, and introduces it into the heat exchange component 103 through the exhaust pipe 204, thereby forming a circulation cycle to enrich the water in the sludge in the heat pump dehumidifier 202. Then the heat exchange component 103 introduces the dry sludge into the discharge hopper 104, and further removes the attached mud and dust through the dust removal brush cylinder 205 to prevent the air path from being blocked. The dust conveyor belt 105 again receives the dust scattered in the air in the box and conveys it to the discharge hopper 104 for discharge, thereby reducing residue and facilitating maintenance.

[0040] The heat exchange component 103 also includes an outer air guide cover plate 303, which is respectively arranged on both sides of the C-shaped air guide pipe 301, and an inner air guide cover plate 304 is arranged between the outer air guide cover plates 303. Both ends of the C-shaped air guide pipe 301 are fixedly connected with sealing slides 305, and both ends of the C-shaped air guide pipe 301 respectively penetrate the connected sealing slides 305, the sealing slides 305, the inner air guide cover plate 304 and the outer air guide cover plate 303 correspond to each other, and the two sides of the sealing slides 305 are respectively sealed and slidably connected with the inner air guide cover plate 304 and the outer air guide cover plate 303, the port of the exhaust pipe 204 penetrates the outer air guide cover plate 303, and a support rod 307 is arranged on the lower side of the end surface of the exhaust pipe 204, and the support rod 307 is respectively fixedly connected with the exhaust pipe 204 and the inner air guide cover plate 304;

[0041] Both ends of the outer air guide plate 303 and the inner air guide plate 304 are semicircular and coaxial, and transmission shafts 309 are provided at the centers of both ends of the inner air guide plate 304. Both ends of the transmission shaft 309 penetrate the inner air guide plate 304 and the outer air guide plate 303 and maintain a sealed rotation connection. Both ends of the transmission shaft 309 are fixedly sleeved with transmission gears 308, which mesh with a plurality of C-shaped air guide tubes 301 located at the ends of the inner air guide plate 304, and the transmission shaft 309 is rotated by a driving motor;

[0042] Both ends of the C-shaped air guide tube 301 are rotatably connected to limit rollers 306, and the limit rollers 306 are respectively connected to the outer air guide cover plate 303 and the inner air guide cover plate 304 in a rolling manner;

[0043] When this embodiment is working, the transmission shaft 309 is driven to rotate and synchronously rotate the transmission gears 308. The transmission gears 308 continuously move the C-shaped air ducts 301 to transfer the sludge from the feed hopper 102 to the discharge hopper 104. At the same time, the exhaust pipe 204 transports the dry high-temperature airflow to the chamber formed by the outer air guide plate 303 and the inner air guide plate 304, so that the dry high-temperature airflow is evenly distributed to each C-shaped air duct 301.

[0044] A sealing frame 401 is fixedly connected to the upper middle side of the C-shaped air guide tube 301. The sealing frame 401 is covered on the outer side of the inner air guide tube 402. The outer periphery of each inner air guide tube 402 is sealed and movably sleeved with an outer sealing tube 403. A return spring 404 is provided on the inner side of the top of the outer sealing tube 403. The two ends of the return spring 404 are respectively fixedly connected to the outer sealing tube 403 and the inner air guide tube 402. A receiving plate 405 is provided on the outer periphery of the outer sealing tube 403. The lower end of the outer sealing tube 403 penetrates the receiving plate 406. The receiving plate 405 is sealed and fixedly connected with the receiving plate 405, the outer periphery of the receiving plate 405 is sealed and slidably connected with the inner periphery of the sealing frame 401, and an outer air guide port 407 is provided on the outer periphery of the middle part of the outer sealing cylinder 403. The outer air guide ports 407 are provided with a plurality of them and are evenly distributed in a multi-layer annular array. The outer air guide ports 407 correspond to the inner air guide ports 406 one by one. An elastic patch is provided on the outer side of the outer air guide port 407, and the upper end of the elastic patch is fixedly connected with the outer sealing cylinder 403 and the lower end is abutted with the outer sealing cylinder 403;

[0045] The upper sides of both ends of the C-shaped air guide tube 301 are fixedly connected to support columns 501, and both sides of the support columns 501 are fixedly connected to fan-shaped baffles 502, the lower ends of the fan-shaped baffles 502 abut against the connecting belt 302, and the width of the lower ends of the fan-shaped baffles 502 is at least half of the distance between adjacent support columns 501;

[0046] When the present embodiment is working, when the sludge is separated from the outer sealing cylinder 403, with the help of the elastic force support of the return spring 404, the receiving plate 405 moves to the upper end of the sealing frame 401, the outer air guide port 407 and the inner air guide port 406 are separated, and the elastic patch is tightly attached to the outer air guide port 407 to maintain the sealing state and reduce heat loss. When the sludge falls on the heat exchange component 103, the receiving plate 405 is pressed down with the help of the weight of the sludge, and then the outer sealing cylinder 403 is moved down, so that the outer air guide port 407 and the inner air guide port 406 are connected. Under the blowing of the heat flow, a gap appears between the elastic patch and the outer air guide port 407, and the elastic patch The sheet prevents sludge particles from entering, and at the same time, the heat flow is blown into the sludge in a more fine manner, fully exchanging heat to the sludge. When it moves to above the discharge hopper 104, the dry sludge blocks break away from and fall into the discharge hopper 104, and each component is reset under the elastic force of the reset spring 404. The outer air guide port 407 is separated from the inner air guide port 406, and the outer sealing tube 403 seals the inner air guide tube 402 again. At the same time, the elastic patch abuts against the side wall of the outer sealing tube 403 to protect the outer air guide port 407 and keep the air path unobstructed. The fan-shaped baffle 502 is used to block the two sides of the received sludge to prevent the sludge from scattering.

[0047] When the present invention is in use, the staff evenly guides the dry hot air to each inner air duct 402 through the C-shaped air duct 301, and then evenly blows it out to each layer and each place of the sludge through each inner air duct port 406. The conveyor belt structure formed by the C-shaped air duct 301 and the connecting belt 302 is used to hold and convey the sludge, thereby eliminating the disadvantages of the mesh conveyor belt, avoiding the sludge blocking the mesh, and reducing the amount of sludge residue in the device itself. Through the inner air duct 402 and the inner air duct port 406, the hot air can fully contact with each layer of the sludge carried during heat exchange, further improving the contact degree with the sludge and the heat exchange efficiency, thereby improving the heat exchange efficiency and dehumidification efficiency;

[0048] During operation, the transmission shaft 309 is driven to rotate, and the transmission gears 308 are rotated synchronously. The transmission gears 308 continuously move the C-shaped air guide pipes 301 to transfer the sludge from the feed hopper 102 to the discharge hopper 104. At the same time, the sludge is evenly and thickly laid on the heat exchange component 103 through the feed hopper 102, and the dehumidification fan 206 guides the water vapor to follow the air flow through the dehumidification box 201 and enter the heat pump dehumidifier 202. The heat pump dehumidifier 202 cools and liquefies the water vapor in the air flow to dehumidify, dry and collect water, and send the dry air into the heat pump heat exchanger 203. The heat absorbed by the heat pump dehumidifier 202 is exchanged with the dry air again through the heat pump heat exchanger 203 to form dry high-temperature air, and is introduced into the heat exchange component 103 through the exhaust pipe 204. The dry high-temperature airflow is transported to the outer air guide plate 303 and the inner air guide plate 3 04, so that it can be evenly transported and diverted to each C-shaped air duct 301, and through each inner air duct 406, the drying heat flow is divided into multiple layers and multiple strands of fine airflows with three-dimensional distribution and dispersed in the sludge, so that the water vapor in the sludge can fully absorb heat and evaporate, thereby forming a circular flow cycle, and the water vapor can enrich the water in the sludge in the heat pump dehumidifier 202 with the help of the above circulation, and then the heat exchange component 103 guides the dried sludge into the discharge hopper 104, and further removes the attached mud and dust through the dust removal brush cylinder 205 to prevent the air path from being blocked, and the dust conveyor belt 105 again receives the dust that is scattered and settled in the air in the box, and transports it to the discharge hopper 104 for discharge, further reducing the residue, and further maintaining the output rate of the dry sludge on the basis of maintaining the stable working efficiency of the heat exchange component 103, shortening the maintenance time;

[0049] During operation, with the help of the elastic force of the return spring 404, the receiving plate 405 moves to the upper end of the sealing frame 401, the outer air guide port 407 and the inner air guide port 406 are separated, the elastic patch is tightly attached to the outer air guide port 407, and the outer sealing tube 403 and the inner air guide tube 402 remain in a sealed state, thereby reducing heat loss and preventing dust from clogging the outer air guide port 407 and the inner air guide port 406, keeping the air path unobstructed. When the sludge falls on the heat exchange component 103, the receiving plate 405 is pressed down by the weight of the sludge, and then the outer sealing tube 403 is moved down, so that the outer air guide port 407 and the inner air guide port 406 are connected. Under the blowing of the heat flow, a gap appears between the elastic patch and the outer air guide port 407, so that the air flow escapes evenly into the sludge. The patch prevents sludge particles from entering the outer air port 407, keeping the air path unobstructed during operation. When the dry sludge blocks break away and fall into the discharge hopper 104, the various components are reset under the elastic force of the reset spring 404, the outer air port 407 is separated from the inner air port 406, and the outer sealing tube 403 seals the inner air tube 402 again. At the same time, the elastic patch abuts against the side wall of the outer sealing tube 403 to protect the outer air port 407, further keeping the air path from being blocked by sludge, overcoming the inevitable shortcomings of the mesh conveyor belt, and maintaining stable and efficient heat exchange efficiency. At the same time, the fan-shaped baffle 502 is used to block the two sides of the received sludge to prevent the sludge from scattering, thereby ensuring the cleanliness of the working box 101, reducing the difficulty and time of maintenance, and promoting universality.

[0050] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A low-temperature heat pump sludge dryer for sludge dehydration, characterized in that: The invention comprises a working box (101), wherein one side of the top of the working box (101) is connected to a feed hopper (102), and the other side of the bottom of the working box (101) is connected to a discharge hopper (104). A heat exchange component (103) is provided in the middle of the inner side of the working box (101). The heat exchange component (103) comprises a C-shaped air guide tube (301). A plurality of C-shaped air guide tubes (301) are provided and are evenly distributed along a conveyor belt-shaped track. Adjacent C-shaped air guide tubes (301) are connected by a connecting belt (302). An inner air guide tube (402) is provided in the middle of the C-shaped air guide tube (301). An inner air guide port (406) is provided on the outer periphery of the inner air guide tube (402). The inner air guide port (406) is arranged in a multi-layer annular array. A dehumidifying box (201) is provided at the top center of the working box (101), and the bottom of the dehumidifying box (201) is connected to the working box (101); A heat pump dehumidifier (202) and a heat pump heat exchanger (203) are provided on the top of the working box (101) and on one side of the dehumidifying box (201); the heat pump dehumidifier (202) is respectively connected to the dehumidifying box (201) and the heat pump heat exchanger (203); and the heat pump heat exchanger (203) is connected to the heat exchange component (103) via an exhaust pipe (204); The heat exchange assembly (103) further comprises outer air guide plates (303), the outer air guide plates (303) being respectively arranged on both sides of the C-shaped air guide pipe (301), and inner air guide plates (304) being arranged between the outer air guide plates (303); Both ends of the outer air guide plate (303) and the inner air guide plate (304) are semicircular and coaxial, and transmission shafts (309) are provided at the centers of both ends of the inner air guide plate (304), and both ends of the transmission shaft (309) penetrate the inner air guide plate (304) and the outer air guide plate (303) and maintain a sealed rotation connection, and both ends of the transmission shaft (309) are fixedly sleeved with transmission gears (308), and the transmission gears (308) are meshed with a plurality of C-shaped air guide tubes (301) located at the ends of the inner air guide plate (304), and the transmission shaft (309) is rotated by a driving motor; A sealing frame (401) is fixedly connected to the upper middle side of the C-shaped air guide tube (301), and the sealing frame (401) is covered on the outer side of the inner air guide tube (402). The outer periphery of each inner air guide tube (402) is sealed and movably sleeved with an outer sealing cylinder (403). A return spring (404) is provided on the inner side of the top of the outer sealing cylinder (403), and the two ends of the return spring (404) are respectively fixedly connected to the outer sealing cylinder (403) and the inner air guide tube (402). A receiving plate (405) is provided on the outer periphery of the outer sealing cylinder (403), and the lower end of the outer sealing cylinder (403) passes through the receiving plate (405) and is sealed and fixedly connected thereto. The outer periphery of the receiving plate (405) is sealingly and slidably connected to the inner periphery of the sealing frame (401), and an outer air guide port (407) is provided on the outer periphery of the middle part of the outer sealing cylinder (403); An elastic patch is provided on the outer side of the outer air guide port (407), the upper end of the elastic patch is fixedly connected to the outer sealing cylinder (403) and the lower end of the elastic patch is in contact with the outer sealing cylinder (403).

2. A low-temperature heat pump sludge dryer for sludge dehydration according to claim 1, characterized in that: A dehumidifying fan (206) is provided in the dehumidifying box (201), a dust-proof screen (207) is provided at the bottom port of the dehumidifying box (201), and a scraper for leveling and thickening the sludge is provided at the outlet of the feed hopper (102).

3. The low-temperature heat pump sludge dryer for sludge dehydration according to claim 1, characterized in that: A dust removal conveyor belt (105) is provided at the inner bottom of the working box (101), a dust removal brush cylinder (205) is provided at the lower side of one end of the heat exchange component (103) close to the discharge hopper (104), and a scraper bar for scraping dust attached to the belt surface is provided at one end of the dust removal conveyor belt (105) located above the discharge hopper (104).

4. The low-temperature heat pump sludge dryer for sludge dehydration according to claim 1, characterized in that: Both ends of the C-shaped air guide tube (301) are fixedly connected to a sealing sliding belt (305), and both ends of the C-shaped air guide tube (301) respectively penetrate the connected sealing sliding belt (305), the sealing sliding belt (305), the inner air guide cover plate (304) and the outer air guide cover plate (303) correspond to each other one by one, and the two side edges of the sealing sliding belt (305) are respectively sealed and slidably connected to the inner air guide cover plate (304) and the outer air guide cover plate (303).

5. The low-temperature heat pump sludge dryer for sludge dehydration according to claim 3, characterized in that: The port of the exhaust pipe (204) passes through the outer air guide cover plate (303), and a support rod (307) is provided on the lower side of the end surface of the exhaust pipe (204), and the support rod (307) is fixedly connected to the exhaust pipe (204) and the inner air guide cover plate (304) respectively.

6. The low-temperature heat pump sludge dryer for sludge dehydration according to claim 1, characterized in that: Both sides of the end of the C-shaped air guide tube (301) are rotatably connected to limit rollers (306), and the limit rollers (306) are respectively rollingly connected to the outer air guide cover plate (303) and the inner air guide cover plate (304).

7. The low-temperature heat pump sludge dryer for sludge dehydration according to claim 1, characterized in that: The outer air guide ports (407) are provided in a plurality and are evenly distributed in a multi-layer annular array, and the outer air guide ports (407) correspond one to one with the inner air guide ports (406).

8. The low-temperature heat pump sludge dryer for sludge dehydration according to claim 1, characterized in that: The upper sides of both ends of the C-shaped air guide tube (301) are fixedly connected to support columns (501), and both sides of the support columns (501) are fixedly connected to fan-shaped baffles (502), the lower ends of the fan-shaped baffles (502) are in contact with the connecting belt (302), and the width of the lower ends of the fan-shaped baffles (502) is at least half of the spacing between adjacent support columns (501).

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