Heat pump sludge drier

Abstract

The utility model discloses a heat pump type sludge drying machine, including heat pump unit and with its intercommunication and drying unit, in drying unit inside operation has at least three groups of net chain conveyer that staggered arrangement of up and down interval, the discharge end of net chain conveyer in upper layer with the feed end of next layer net chain conveyer correspond, be equipped with net chain dredging roller on the output end sprocket axle of net chain conveyer, be equipped with a plurality of columnar dredging body on the outer peripheral surface of net chain dredging roller, and each columnar dredging body can with the operation of sprocket axle in and out the corresponding mesh hole on the conveying net chain, still be equipped with net chain knock cleaning roller under conveying net chain, and this net chain knock cleaning roller and conveying net chain downside edge knock type contact, and net chain knock cleaning roller and the chain of conveying net chain drive connection. The heat pump type sludge drying machine of adopting the utility model can keep the unobstructed of mesh hole in conveying net chain, and promotes drying efficiency.

Description

Technical Field

[0001] This utility model relates to a sludge treatment device, and more particularly to a sludge drying device that uses a heat pump to provide a heat source. Background Technology

[0002] Sludge drying is an environmentally friendly and renewable sludge treatment method. Its main equipment is a sludge dryer. In the sludge dryer, a heat pump unit is connected to a drying unit. The heat pump unit provides hot air to dehumidify and dry the sludge material. The hot air absorbs moisture from the sludge, causing the sludge to cool and increase in humidity after drying. The air then returns to the heat pump unit through a return air duct, where it is dehumidified and heated before being supplied to the drying unit. This air medium is recyclable, offering advantages such as energy saving and environmental protection. Inside the drying unit, the sludge to be dried is conveyed by multiple interconnected mesh conveyors arranged vertically. Operating from top to bottom, the heat pump unit provides hot air that enters from below the dryer and passes through the conveyor chains of each mesh conveyor to dry the sludge. The sludge to be dried gradually from top to bottom and is finally output from the bottom mesh conveyor. In this process, the hot air, as the drying medium, needs to pass through the conveyor chains to contact the sludge material and dry it. Therefore, the mesh openings of the conveyor chains must be kept clear. However, for wet materials such as sludge, it is very easy for them to adhere to the mesh openings of the conveyor chains and cause blockages, which will reduce the drying efficiency. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a heat pump sludge dryer that can keep the mesh holes in the conveyor belt unobstructed and improve drying efficiency.

[0004] To solve the above-mentioned technical problems, this utility model provides a heat pump type sludge dryer, including a heat pump unit and a dryer unit. At least three sets of mesh chain conveyors are arranged in a staggered, alternating pattern within the dryer unit. The discharge end of the upper mesh chain conveyor corresponds to the feed end of the lower mesh chain conveyor. The hot air outlet of the heat pump unit is connected to the hot air inlet hopper below the dryer unit, and the return air collection hopper above the dryer unit is connected to the return air inlet of the heat pump unit. A mesh chain unblocking roller is provided on the sprocket shaft at the output end of the mesh chain conveyor. Several columnar unblocking bodies are provided on the outer circumferential surface of the mesh chain unblocking roller, and each columnar unblocking body can enter and exit the corresponding mesh hole on the conveyor mesh chain as the sprocket shaft rotates. A mesh chain knocking cleaning roller is also provided on the lower side of the conveyor mesh chain, and this knocking cleaning roller makes knocking contact with the lower side of the conveyor mesh chain. The mesh chain knocking cleaning roller is connected to the chain drive of the conveyor mesh chain.

[0005] In the above structure, since a mesh chain unblocking roller is provided on the sprocket shaft at the output end of the mesh chain conveyor, and several columnar unblocking bodies are provided on the outer circumferential surface of the mesh chain unblocking roller, each columnar unblocking body can enter and exit the corresponding mesh hole on the conveyor mesh chain as the sprocket shaft rotates, the mesh chain unblocking roller will rotate together with the sprocket shaft at the output end of the mesh chain conveyor, and its running speed is synchronized with the conveyor mesh chain driven by the sprocket on the sprocket shaft. The several columnar unblocking bodies provided on the outer circumferential surface of the mesh chain unblocking roller will insert into the corresponding mesh hole on the conveyor mesh chain and enter the semi-circular arc part at the output end during rotation. As the columnar unblocking body moves through the mesh holes below the sprocket shaft and away from the semi-circular arc, it exits. After entering the mesh holes of the conveyor chain, the columnar unblocking body pushes out the sludge adhering to the mesh holes until the sludge reaches the middle of the semi-circular arc at the output end of the conveyor chain and falls out, without continuing to clog the mesh holes. The mesh holes of the conveyor chain will be automatically unblocked after discharge. This cycle continues to keep all the mesh holes in the entire conveyor chain unobstructed, allowing the hot air, as the drying medium, to pass smoothly through the conveyor chain to dry the sludge, thus improving the drying efficiency.

[0006] Furthermore, since a chain-beating cleaning roller is also provided on the lower side of the conveyor chain, and this chain-beating cleaning roller makes striking contact with the lower side of the conveyor chain, and is connected to the chain drive of the conveyor chain, the chain-beating cleaning roller will continuously beat the conveyor chain during its operation, causing the conveyor chain to vibrate. This will further clean the sludge remaining on the mesh after it has been cleared by the columnar unblocking body on the chain unblocking roller. After being blown by the drying hot air, this residual sludge becomes relatively dry, reducing its adhesion to the conveyor chain. As the conveyor chain vibrates and shakes, it will peel off from the mesh of the conveyor chain, and the mesh of the conveyor chain without sludge adhesion will be more unobstructed.

[0007] In a preferred embodiment of this invention, the mesh chain unblocking roller is a cylindrical body. The outer circumferential surface of the cylindrical mesh chain unblocking roller is close to the inner side of the conveyor mesh chain supported on the output end sprocket shaft. The mesh chain unblocking roller is located between the left and right sprockets on the sprocket shaft and is fixedly connected to the sprocket shaft. With this embodiment, the mesh chain unblocking roller is reliably and conveniently installed, facilitating the entry of the columnar unblocking body onto it into the mesh openings of the conveyor mesh chain.

[0008] In another preferred embodiment of this invention, the columnar unclogging body is installed on the roller wall of the mesh chain unclogging roller. This embodiment facilitates the arrangement and installation of the columnar unclogging body, and also makes maintenance and replacement easier.

[0009] In another preferred embodiment of this utility model, the columnar unblocking bodies on the mesh chain unblocking roller are arranged in several rows along the circumference, and their distribution pattern corresponds to the mesh chain pitch t of the conveying mesh chain; the number and position of the columnar unblocking bodies in each row correspond to the number and position of the mesh holes in the width direction of the conveying mesh chain. This embodiment ensures that the arrangement of the columnar unblocking bodies on the mesh chain unblocking roller corresponds to the mesh hole arrangement of the conveying mesh chain, so that each mesh hole on each row of mesh chain links can be connected and unblocked by a corresponding columnar unblocking body.

[0010] In a further preferred embodiment of this invention, the circumferential distribution pattern of the columnar unblocking bodies corresponds to the arrangement pattern of the chain links in the conveyor chain that are not connected to the connecting shaft. Using this embodiment, for a conveyor chain where the chain mesh is connected to the chains on both sides via the connecting shaft, the mesh openings in the chain link where the connecting shaft is located cannot accommodate the columnar unblocking bodies. The circumferential distribution pattern of the columnar unblocking bodies, corresponding to the arrangement pattern of the chain links in the conveyor chain that are not connected to the connecting shaft, allows the columnar unblocking bodies to avoid the chain links where the connecting shaft is located, ensuring the normal operation of the unblocking roller. Furthermore, the chain links where the connecting shaft is located are inherently less unobstructed due to the presence of the connecting shaft; slight blockage does not significantly affect the overall smoothness of the conveyor chain. Moreover, due to the presence of the connecting shaft, there is considerable relative movement between the connecting shaft and the chain mesh, making it difficult for sludge to adhere and form blockages. Even if sludge does adhere, it will be cleared and unblocked by the impact and vibration of the chain against the cleaning roller.

[0011] In another preferred embodiment of this invention, both ends of the mesh chain striking cleaning roller are connected to the chain drive of the corresponding side of the conveying mesh chain. With this embodiment, the operation of the mesh chain striking cleaning roller is reliable.

[0012] In another preferred embodiment of this utility model, the mesh chain striking cleaning roller is mounted on a cleaning roller support arm, which is oscillatingly supported on the drying frame of the drying unit. A cleaning drive sprocket is rotatably supported on the drying frame of the drying unit, and this cleaning drive sprocket meshes with the chain of the conveying mesh chain. An eccentric pin is provided on the outer side of the cleaning drive sprocket, and the cleaning drive sprocket is connected to the cleaning roller support arm through the eccentric pin and the cleaning drive connecting rod. The cleaning drive sprocket with the eccentric pin, the cleaning drive connecting rod, and the cleaning roller support arm constitute a crank-rocker mechanism. In this embodiment, the running chain drives the cleaning drive sprocket, which in turn drives the crank-rocker mechanism. The mesh chain striking cleaning roller, mounted on the cleaning roller support arm which acts as a rocker, can conveniently and reliably achieve continuous striking of the conveying mesh chain, ensuring the cleaning effect.

[0013] In a further preferred embodiment of this invention, the mesh chain striking cleaning roller is rotatably supported on the extended end of the cleaning roller support arm. With this embodiment, the rotatable mesh chain striking cleaning roller reduces sliding friction damage to the operating conveyor mesh chain.

[0014] In another further preferred embodiment of this invention, the outer periphery of the chain-beating cleaning roller is provided with a rubber coating. With this embodiment, the rubber coating can reduce the rigid impact on the conveyor chain and the resulting noise during the beating process.

[0015] In a further preferred embodiment of this utility model, the heat pump unit includes a heat pump unit casing, an evaporator, a compressor, an expansion valve, a condenser, and a fan. The evaporator, compressor, expansion valve, and condenser constitute a refrigerant working circuit. A condensate tank is provided below the evaporator. The return air inlet is located on the heat pump unit casing opposite the evaporator. The fan is adjacent to the condenser. The hot air outlet is located on the heat pump unit casing and communicates with the fan outlet. This embodiment allows the humid air recovered from the drying unit to be promptly dehumidified and dried by the evaporator, then heated by the condenser, and promptly transported into the drying unit by the fan. The fan provides the circulating power for the air used as the drying medium, and the condensate tank collects all the moisture condensed from the humid air. The overall layout is reasonable. Attached Figure Description

[0016] The present invention, a heat pump type sludge dryer, will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 This is a schematic diagram of a specific embodiment of the heat pump sludge dryer of this utility model;

[0018] Figure 2 yes Figure 1 A top view of the mesh chain unblocking roller section in the structure shown;

[0019] Figure 3 yes Figure 1 A schematic diagram of the structure shown, including the mesh chain impact cleaning roller and its related components.

[0020] Figure 4 yes Figure 3 Top view.

[0021] In the diagram: 1-Drying feed inlet, 2-Drying unit, 3-Drying discharge outlet, 4-Wire mesh conveyor, 5-Return air collection hopper, 6-Hot air input hopper, 7-Wire mesh chain knocking cleaning roller, 8-Wire mesh chain unblocking roller, 9-Sprocket shaft, 10-Drying frame, 11-Compressor, 12-Heat pump unit casing, 13-Heat pump unit, 14-Hot air outlet, 15-Fan, 16-Evaporator, 17-Condenser, 18-Condensate tank, 19-Return air intake, 20-Expansion valve, 21-Conveying wire mesh chain, 22-Shaft, 23-Wire mesh chain link, 24-Mesh, 25-Chain, 26-Columnar unblocking body, 27-Sprocket, 28-Rubber coating layer, 29-Cleaning roller support arm, 30-Cleaning drive linkage, 31-Cleaning drive sprocket, 32-Eccentric pin. Detailed Implementation

[0022] exist Figure 1 In the heat pump sludge dryer shown, the dryer unit 2 includes a sealed dryer frame 10. At least three sets of mesh conveyor belts 4 are installed and operated within the dryer frame 10, arranged in a staggered, alternating pattern. Four sets are shown in the figure; however, five or more sets of mesh conveyor belts 4 can be installed and operated depending on the drying requirements. The discharge end of the upper mesh conveyor belt 4 is located above the feed end of the lower mesh conveyor belt 4. Adjacent mesh conveyor belts 4 operate in opposite directions. A drying feed inlet 1 is provided at the top end of the dryer frame 10, corresponding to the feed end of the uppermost mesh conveyor belt 4. The drying discharge outlet 3 of the dryer unit 2 is located on the lower side of the dryer frame 10, opposite the discharge end of the lowermost mesh conveyor belt 4. A hot air inlet hopper 6 is provided below the drying frame 10 of the dryer unit 2. The hot air inlet hopper 6 is connected to the hot air outlet 14 of the heat pump unit 13. A return air collection hopper 5 is provided above the drying frame 10 of the dryer unit 2. The return air collection hopper 5 is connected to the return air inlet 19 of the heat pump unit 13. The openings of the hot air inlet hopper 6 and the return air collection hopper 5 are opposite to the mesh conveyor 4. The dry hot air delivered by the heat pump unit 13 enters the drying frame 10 through the hot air inlet hopper 6 and passes through each mesh conveyor 4 to heat, dehumidify and dry the wet sludge on the mesh conveyor 4 layer by layer. The airflow after absorbing moisture and cooling returns to the heat pump unit 13 through the return air collection hopper 5 and the return air inlet 18.

[0023] The heat pump unit 13 includes a heat pump unit casing 12, an evaporator 16, a compressor 11, an expansion valve 20, a condenser 17, and a fan 15. The evaporator 16, compressor 11, expansion valve 20, and condenser 17 constitute a refrigerant working circuit. A condensate tank 18 is provided below the evaporator 16. A return air inlet 19 is provided on the heat pump unit casing 12 opposite to the evaporator 16. The fan 15 is adjacent to the condenser 17. A hot air outlet 14 is provided on the heat pump unit casing 12 and is connected to the air outlet of the fan 15. After being humidified and cooled in the dryer unit 2, the airflow is drawn into the heat pump unit 13 through the return air collection hopper 5 and the return air inlet 19. The evaporator 16 in the heat pump unit 13 absorbs heat, cools, and dehumidifies, turning the air into dry air. The condensate tank 18 collects the condensate and discharges it outside the heat pump unit casing 12. The refrigerant in the heat pump unit 13 absorbs heat from the return air, is compressed by the compressor 11, and its temperature rises before entering the condenser 17. The dry gas flows through the condenser 17 and is heated into dry hot air, which is then transported back to the dryer unit 2 by the fan 15 to continue drying the material. In this way, the air medium used to dry the damp sludge is continuously recycled, and no waste gas is emitted. The heat pump unit 13 achieves heat transfer through the refrigerant, resulting in significant energy savings.

[0024] See Figure 2The mesh conveyor 4 includes a conveying mesh chain 21. The conveying mesh chain 21 is wrapped around the sprockets 27 of the sprocket shafts 9 at both ends by chains 25 on both sides. The entire conveying mesh chain 21 is driven by a conveying motor to drive the sprocket shafts 22. The mesh on the conveying mesh chain 21 is formed by several mesh chain links 23 made of stainless steel wire interlocking along the length direction, forming several mesh holes 24 distributed in a corresponding pattern in the middle. Under normal circumstances, the mesh is connected to the chains 25 on both sides by the intermittently inserted shafts 22 to form the conveying mesh chain 21. The intermittently arranged shafts 21 support the mesh. A mesh chain unblocking roller 8 is provided on the sprocket shaft 9 at the output end of the mesh chain conveyor 4. The mesh chain unblocking roller 8 is cylindrical, and its outer circumferential surface is close to the inner side of the conveying mesh chain 21 supported on the output end sprocket shaft 9. The mesh chain unblocking roller 8 is located between the left and right sprockets 27 on the sprocket shaft 9 and is fixedly connected to the sprocket shaft 9. Several columnar unblocking bodies 26 are provided on the outer circumferential surface of the mesh chain unblocking roller 8. The columnar unblocking bodies 26 are usually installed on the roller wall of the mesh chain unblocking roller 8 with screws. The cross-section of the columnar unblocking bodies 26 can be circular or prismatic, similar to the shape of the mesh 24. The columnar unblocking bodies 26 are arranged in several rows along the circumferential direction on the outer circumferential surface of the mesh chain unblocking roller 8, and their distribution pattern is similar to that of the mesh chain 24. The chain pitch t of the conveyor chain 21 corresponds to the distribution pattern of each row of columnar unblocking bodies 26 along the circumference of the conveyor chain 21 supported by the sprocket 22. The arrangement pattern of the chain links 23 in the conveyor chain 21 that are not connected to the sprocket 22 corresponds to the number and position of the columnar unblocking bodies 26 in each row. The number and position of the columnar unblocking bodies 26 in each row correspond to the number and position of the mesh holes 24 in the width direction of the conveyor chain 21. Each columnar unblocking body 26 can enter and exit the corresponding mesh hole 24 on the conveyor chain 21 with the rotation of the sprocket shaft 9, similar to the process of the sprocket teeth entering and exiting the chain, thereby pushing out the sludge blocked in the mesh hole 24 of the conveyor chain 21, keeping the mesh hole 24 in the conveyor chain 21 unobstructed, and improving the drying efficiency.

[0025] A chain-beating cleaning roller 7 is also provided on the lower side of the conveyor chain 21. The chain-beating cleaning roller 7 is connected to the chain 25 of the conveyor chain 21 via a drive connection. See [link to relevant documentation]. Figure 3 and Figure 4The outer periphery of the mesh chain striking cleaning roller 7 is provided with a rubber coating layer 28. Both ends of the mesh chain striking cleaning roller 7 are respectively mounted on the cleaning roller support arms 29 on both sides. Preferably, the installation method is to rotatably support the extended ends of the cleaning roller support arms 29 via bearings. The cleaning roller support arms 29 on both sides are oscillatingly supported on the drying frame 10 of the drying unit 2 via a support shaft. Two cleaning drive sprockets 31 are rotatably supported on the drying frame 10 of the drying unit 2 via a rotating shaft and a rotating shaft support. The two cleaning drive sprockets 31 are respectively engaged with the chains 25 on both sides of the conveying mesh chain 21. An eccentric pin 32 is provided on the outer side of the cleaning drive sprockets 31. The two cleaning drive sprockets 31 are respectively... Each eccentric pin 32 and corresponding cleaning drive link 30 is connected to the cleaning roller support arm 29 on the same side, so that both ends of the mesh chain striking cleaning roller 7 are connected to the chain 25 on the corresponding side of the conveyor mesh chain 21. The cleaning drive sprocket 31 with eccentric pin 32, the cleaning drive link 30 and the cleaning roller support arm 29 on each side form a crank rocker mechanism, so that the mesh chain striking cleaning roller 7 continuously strikes the lower side of the conveyor mesh chain 21 as the conveyor mesh chain 21 runs, causing the conveyor mesh chain 21 to vibrate and shake, and the sludge remaining on the conveyor mesh chain 21 will be peeled off and fall off, and the mesh 24 of the conveyor mesh chain 21 will be more unobstructed.

[0026] The above are only some preferred embodiments of this utility model, but this utility model is not limited thereto, and many improvements and modifications can be made. Any improvements and modifications made based on the basic principles of this utility model should be considered to fall within the protection scope of this utility model.

Claims

1. A heat pump sludge dryer, comprising a heat pump unit (13) and a dryer unit (2), wherein at least three sets of mesh conveyors (4) are arranged alternately at intervals within the dryer unit (2), the discharge end of the upper mesh conveyor (4) corresponds to the feed end of the lower mesh conveyor (4), the hot air outlet (14) on the heat pump unit (13) is connected to the hot air inlet hopper (6) below the dryer unit (2), and the return air collection hopper (5) above the dryer unit (2) is connected to the return air inlet (19) of the heat pump unit (13), characterized in that: A mesh chain unblocking roller (8) is provided on the sprocket shaft (9) at the output end of the mesh chain conveyor (4). Several columnar unblocking bodies (26) are provided on the outer circumferential surface of the mesh chain unblocking roller (8). Each columnar unblocking body (26) can enter and exit the corresponding mesh hole (24) on the conveying mesh chain (21) as the sprocket shaft (9) rotates. A mesh chain knocking cleaning roller (7) is also provided on the lower side of the conveying mesh chain (21). The mesh chain knocking cleaning roller (7) is in knocking contact with the lower side of the conveying mesh chain (21). The mesh chain knocking cleaning roller (7) is connected to the chain (25) of the conveying mesh chain (21) through a drive.

2. The heat pump sludge dryer according to claim 1, characterized in that: The mesh chain unblocking roller (8) is a cylindrical body. The outer circumferential surface of the cylindrical mesh chain unblocking roller (8) is close to the inner side of the conveying mesh chain (21) supported on the output end sprocket shaft (9). The mesh chain unblocking roller (8) is located between the left and right sprockets (27) on the sprocket shaft (9) and is fixedly connected to the sprocket shaft (9).

3. The heat pump sludge dryer according to claim 1 or 2, characterized in that: The columnar unblocking body (26) is installed on the roller wall of the mesh chain unblocking roller (8).

4. The heat pump sludge dryer according to claim 1, characterized in that: The columnar unblocking bodies (26) on the mesh chain unblocking roller (8) are arranged in several rows along the circumference, and their distribution pattern corresponds to the mesh chain pitch t of the conveying mesh chain (21); the number and position of the columnar unblocking bodies (26) in each row correspond to the number and position of the mesh holes (24) in the width direction of the conveying mesh chain (21).

5. The heat pump sludge dryer according to claim 1 or 4, characterized in that: The circumferential distribution pattern of the columnar dredging bodies (26) in each row corresponds to the arrangement pattern of the chain links (23) in the conveying chain (21) that are not connected to the connecting shaft (22).

6. The heat pump sludge dryer according to claim 1, characterized in that: Both ends of the chain knocking cleaning roller (7) are connected to the chain (25) on the corresponding side of the conveying chain (21).

7. The heat pump sludge dryer according to claim 1 or 6, characterized in that: The mesh chain striking cleaning roller (7) is set on the cleaning roller support arm (29). The cleaning roller support arm (29) is swayed and supported on the drying frame (10) of the drying unit (2). A cleaning drive sprocket (31) is rotatably supported on the drying frame (10) of the drying unit (2). The cleaning drive sprocket (31) meshes with the chain (25) of the conveying mesh chain (21). An eccentric pin (32) is provided on the outside of the cleaning drive sprocket (31). The cleaning drive sprocket (31) is connected to the cleaning roller support arm (29) through the eccentric pin (32) and the cleaning drive connecting rod (30). The cleaning drive sprocket (31) with the eccentric pin (32), the cleaning drive connecting rod (30) and the cleaning roller support arm (29) constitute a crank rocker mechanism.

8. The heat pump sludge dryer according to claim 7, characterized in that: The chain-beating cleaning roller (7) is rotatably supported on the extended end of the cleaning roller support arm (29).

9. The heat pump sludge dryer according to claim 1, characterized in that: The outer periphery of the chain knocking cleaning roller (7) is provided with a rubber coating layer (28).

10. The heat pump sludge dryer according to claim 1, characterized in that: The heat pump unit (13) includes a heat pump unit casing (12), an evaporator (16), a compressor (11), an expansion valve (20), a condenser (17), and a fan (15). The evaporator (16), compressor (11), expansion valve (20), and condenser (17) form a refrigerant working circuit. A condensate tank (18) is provided below the evaporator (16). The return air inlet (19) is located on the heat pump unit casing (12) opposite to the evaporator (16). The fan (15) is adjacent to the condenser (17). The hot air outlet (14) is located on the heat pump unit casing (12) and is connected to the air outlet of the fan (15).

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