Sludge drying system adopting low-temperature heat pump technology

Abstract

The invention discloses a sludge drying system adopting a low-temperature heat pump technology, which relates to the technical field of sludge drying and comprises a mounting frame, a lower pressing plate and a bearing plate, a plurality of vertically-arranged driving parts are arranged on the bottom face of the top of the mounting frame, and the bottom ends of the driving parts are connected with the lower pressing plate. A plurality of lower pressing blocks are arranged on the bottom surface of the lower pressing plate; the bearing plate is rotationally arranged on the mounting frame, and the bearing plate is located below the lower pressing block; a plurality of pressure-bearing cylinders are arranged on the top surface of the pressure-bearing plate; a motor is arranged on the mounting frame; the pressure-bearing cylinders are located below the corresponding lower pressing blocks. The shape of the internal space of the pressure-bearing cylinder corresponds to and is the same as that of the lower pressing block; a sludge pipe is arranged on the lower pressing plate, and an inner pipe is arranged in the lower pressing block; a plurality of inner passages are formed in the bearing plate; a water conveying pipe is arranged at the bottom of the bearing plate, and the bottom end of the inner passage communicates with the water conveying pipe; the technical effects that all the sludge plates can be demoulded at the same time when the sludge plates are demoulded, and the demoulding efficiency is improved are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of sludge drying, and particularly to a sludge drying system using low-temperature heat pump technology. Background Art

[0002] With the improvement of environmental protection requirements, the treatment of urban sludge has become an important link in the field of solid waste resource utilization. Traditional sludge thermal drying technologies have problems such as high energy consumption and complex tail gas treatment. The low-temperature heat pump technology has been gradually applied to the field of sludge dewatering due to its energy-saving characteristics, but there is still a bottleneck in the actual application that it is difficult to balance the equipment efficiency and operation cost.

[0003] Existing sludge filter press drying equipment mostly adopts a fixed filter press structure, such as a plate and frame sludge dewatering machine: in a closed state, the sludge pumped in by a high-pressure pump is extruded through the plate and frame, so that the water in the sludge is discharged through the filter cloth to achieve the purpose of dewatering. And the existing plate and frame sludge dewatering machine needs to demold the sludge plates, so it needs to increase a part of the length, resulting in a large floor area, and each time only one or a few sludge plates can be demolded, and the demolding efficiency is poor. Summary of the Invention

[0004] This application provides a sludge drying system using low-temperature heat pump technology, which solves the technical problem that when the existing sludge drying equipment demolds the sludge plates, only one or a few sludge plates can be demolded each time, and the demolding efficiency is poor; and realizes the technical effect that when demolding the sludge plates, all the sludge plates can be demolded simultaneously, improving the demolding efficiency.

[0005] This application provides a sludge drying system using low-temperature heat pump technology, including a mounting frame, a lower pressing plate and a bearing plate; a plurality of vertically arranged driving components are arranged on the bottom surface of the top of the mounting frame, and the bottom end of the driving component is connected with the lower pressing plate; a plurality of lower pressing blocks are arranged on the bottom surface of the lower pressing plate; the bearing plate is rotatably arranged on the mounting frame, and the bearing plate is located below the lower pressing blocks; a plurality of bearing cylinders are arranged on the top surface of the bearing plate; a motor is arranged on the mounting frame, and the output shaft of the motor passes through the mounting frame and is connected with the bearing plate to drive the bearing plate to rotate; the number of the lower pressing blocks and the bearing cylinders is the same and they correspond one by one, and the bearing cylinder is located below the corresponding lower pressing block; the shape of the internal space of the bearing cylinder corresponds to and is the same as the shape of the lower pressing block; a sludge pipe is arranged on the lower pressing plate, and an inner pipe is arranged inside the lower pressing block. The top of the inner pipe passes through the lower pressing plate and is communicated with the sludge pipe, and the bottom of the inner pipe is communicated with the space below the lower pressing block; a plurality of inner passages are opened in the bearing plate, and the number of the inner passages is the same as and corresponds to the number of the bearing cylinders one by one; a water delivery pipe is arranged at the bottom of the bearing plate, and the bottom end of the inner passage is communicated with the water delivery pipe, and the top end of the inner passage is communicated with the inside of the bearing cylinder.

[0006] Further, the bottom end opening of the inner pipe is provided with a check valve, with the input end above the check valve and the output end below the check valve.

[0007] Further, the pressure-bearing cylinder includes a housing and a filter plate, where the filter plate is disposed inside the housing; the filter plate is a hemispherical shell structure and protrudes downward, and a filter cloth is provided on the filter plate; the lower pressing block is a coaxial combination of upper and lower parts. The upper part of the lower pressing block is a cylindrical main body, the lower part of the lower pressing block is a hemispherical base, and the upper and lower parts of the lower pressing block are smoothly transitioned through a tangent surface.

[0008] Further, the filter plate is threadedly connected inside the housing, and the connection position between the housing and the filter plate is smoothly transitioned. The space above the filter plate corresponds to the lower pressing block.

[0009] Further, a spiral groove is provided on the inner wall of the housing, and the spiral groove is located above the filter plate; the inner tube is coaxially arranged with the lower pressing block, and the lower pressing block is rotatably arranged on the bottom surface of the lower pressing plate; a slider is provided on the side wall of the lower pressing block, and the shape of the slider matches the shape of the spiral groove.

[0010] Further, a guiding groove is provided at the top of the housing, the bottom surface of the guiding groove is inclined, and the bottom of the guiding groove communicates with the spiral groove.

[0011] Further, a vertical groove is provided on the inner wall of the housing, and the vertical groove is located above the filter plate; the vertical groove is vertically arranged, and the top of the vertical groove communicates with the bottom of the spiral groove. The shape of the vertical groove matches the shape of the slider.

[0012] Further, a main water pipe is provided on the lower pressing plate, and a plurality of branch water pipes are provided on the water injection path; the number of branch water pipes is the same as that of the lower pressing blocks and they correspond one by one; a hemispherical diaphragm is provided at the bottom of the lower pressing block, and an inner opening is provided at the bottom of the diaphragm; the outer opening of the diaphragm is sealingly sleeved on the outer wall of the lower pressing block, the inner opening of the diaphragm is sealingly connected to the bottom of the lower pressing block, and the bottom end opening of the inner tube is located inside the inner opening of the diaphragm, so that the diaphragm does not affect the operation of the inner tube; an injection path is provided inside the lower pressing block, the top of the injection path communicates with the corresponding injection path, and the bottom of the injection path communicates with the space between the diaphragm and the lower pressing block.

[0013] Further, a plurality of scraping blades are uniformly provided on the diaphragm.

[0014] Further, the inside of the scraping blade is hollow, and the internal space of the scraping blade communicates with the space between the diaphragm and the lower pressing block.

[0015] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0016] Supported by a gantry mounting frame, multiple groups of pressure sensing drive components are arranged at the top to vertically drive the lower pressing plate, and a rotating bearing plate is configured at the bottom; the bottom surface of the lower pressing plate is distributed with column - hemispherical composite pressing blocks, with a sludge conveying pipe and a one - way valve built - in; the bearing plate is correspondingly provided with a split - type pressure - bearing cylinder containing hemispherical filter plates, and a drainage channel penetrating the bearing plate is communicated below the filter plates; during pressure filtration, a sealed chamber is formed between the pressing blocks and the pressure - bearing cylinder, and after the sludge is pressurized, the moisture is filtered by the filter plates and discharged through the bottom water conveying pipe; the system drives the overall turnover of the bearing plate for discharging by a dual - motor, and combines the reverse flushing of the filter cloth by the water conveying pipe to achieve efficient demolding; effectively solving the technical problem that in the existing sludge drying equipment, only one or several sludge plates can be demolded each time during sludge plate demolding, with poor demolding efficiency; furthermore, achieving the technical effect that all sludge plates can be demolded simultaneously during sludge plate demolding, improving the demolding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the sludge drying system with low - temperature heat pump technology of the present invention;

[0018] Figure 2 It is a schematic diagram of the inner pipe position of the sludge drying system with low - temperature heat pump technology of the present invention;

[0019] Figure 3 It is a schematic diagram of the one - way valve position of the sludge drying system with low - temperature heat pump technology of the present invention;

[0020] Figure 4 It is a schematic diagram of the pressure - bearing cylinder structure of the sludge drying system with low - temperature heat pump technology of the present invention;

[0021] Figure 5 It is a schematic diagram of the spiral groove and guiding groove of the sludge drying system with low - temperature heat pump technology of the present invention;

[0022] Figure 6 It is a schematic diagram of the slider position of the sludge drying system with low - temperature heat pump technology of the present invention;

[0023] Figure 7 It is a schematic diagram of the rotating state of the pressing block of the sludge drying system with low - temperature heat pump technology of the present invention;

[0024] Figure 8 It is a schematic diagram of the vertical groove of the sludge drying system with low - temperature heat pump technology of the present invention;

[0025] Figure 9 It is a schematic diagram of the main water pipe position of the sludge drying system with low - temperature heat pump technology of the present invention;

[0026] Figure 10 It is a schematic diagram of the branch water pipe position of the sludge drying system with low - temperature heat pump technology of the present invention;

[0027] Figure 11Schematic diagram of the positions of the diaphragm and the scraper in the sludge drying system of the low-temperature heat pump technology of the present invention;

[0028] Figure 12 Schematic diagram of the position of the water injection passage in the sludge drying system of the low-temperature heat pump technology of the present invention.

[0029] In the figure: 10, mounting frame; 11, driving component; 12, lower pressing plate; 13, bearing plate; 131, inner passage; 14, motor; 15, sludge pipe; 16, water delivery pipe; 20, lower pressing block; 21, inner pipe; 22, one-way valve; 23, slider; 24, diaphragm; 25, scraper; 26, water injection passage; 30, pressure-bearing cylinder; 31, outer shell; 311, spiral groove; 312, guiding groove; 313, vertical groove; 32, filter plate; 40, main water pipe; 41, branch water pipe. Specific embodiments

[0030] To facilitate the understanding of the present invention, the present application will be described more comprehensively with reference to the relevant drawings; the preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0031] It should be noted that the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs; the terms used in the description of the present invention in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0033] Example 1: As Figures 1 to 4 shown, the sludge drying system of the low-temperature heat pump technology of the present application includes a mounting frame 10, a lower pressing plate 12, a bearing plate 13, a power assembly and a control unit.

[0034] A plurality of vertically arranged driving components 11 are provided on the bottom surface of the top of the mounting frame 10, and the bottom end of the driving component 11 is connected to the lower pressing plate 12.

[0035] Among them, the mounting frame 10 can be a gantry frame.

[0036] It should be noted that the driving member 11 is provided with a pressure-sensing telescopic member, which can be a force-feedback electric telescopic rod or a telescopic cylinder. The number of the plurality of driving members 11 can be 2, 3, 4, 5, 6 driving members 11, etc. The specific number and position distribution of the driving members 11 are selected according to actual needs and will not be elaborated here.

[0037] The lower pressing plate 12 is horizontally arranged, and a plurality of lower pressing blocks 20 are arranged on the bottom surface of the lower pressing plate 12.

[0038] The bearing plate 13 is rotatably arranged on the mounting frame 10, and the bearing plate 13 is located below the lower pressing block 20.

[0039] The bearing plate 13 is horizontally arranged, and a plurality of bearing cylinders 30 are arranged on the top surface of the bearing plate 13.

[0040] It should be noted that both ends of the bearing plate 13 can be rotatably arranged on the side wall of the mounting frame 10 through a bearing support system. The bearing support system is a prior art and will not be elaborated here.

[0041] A motor 14 is arranged on the mounting frame 10. The output shaft of the motor 14 passes through the mounting frame 10 and is connected to the bearing plate 13 for driving the bearing plate 13 to rotate.

[0042] It should be noted that the motor 14 can be a high-torque motor, and the number of the motors 14 can be two. The two motors 14 are symmetrically arranged on both sides of the bearing plate 13 to control the state of the bearing plate 13 through double driving.

[0043] The number of the lower pressing blocks 20 is the same as that of the bearing cylinders 30 and they correspond to each other one by one. The bearing cylinder 30 is located below the corresponding lower pressing block 20.

[0044] It should be noted that the number of the plurality of lower pressing blocks 20 can be 3, 4, 5, 6, 7 lower pressing blocks 20, etc. The specific number and position distribution are selected according to actual needs and will not be selected here.

[0045] The lower pressing block 20 is a coaxial combination body from top to bottom. The upper part of the lower pressing block 20 is a cylindrical main body, the lower part of the lower pressing block 20 is a hemispherical base, and the upper and lower parts of the lower pressing block 20 are smoothly transitioned through a tangent surface.

[0046] The shape of the internal space of the bearing cylinder 30 corresponds to and is the same as the shape of the lower pressing block 20.

[0047] It should be noted that the lower pressing block 20 and the internal space of the bearing cylinder 30 are coaxially arranged so that the lower pressing block 20 can extend into the bearing cylinder 30.

[0048] A sludge pipe 15 is provided on the lower pressing plate 12 , and an inner pipe 21 is provided inside the lower pressing block 20 . The top of the inner pipe 21 passes through the lower pressing plate 12 and communicates with the sludge pipe 15 , and the bottom of the inner pipe 21 communicates with the space below the lower pressing block 20 .

[0049] The sludge pipe 15 and the driving component 11 are staggered, and the sludge pipe 15 can be a rubber hose.

[0050] It should be noted that the sludge pipe 15 is connected to a sludge pump (not shown in the figure) for conveying the sludge to be processed, which is a prior art and will not be described in detail here.

[0051] Preferably, a one-way valve 22 is provided at the bottom opening of the inner tube 21 , the upper side of the one-way valve 22 is the input end, and the lower side of the one-way valve 22 is the output end.

[0052] The pressure-bearing cylinder 30 includes a shell 31 and a filter plate 32 , wherein the filter plate 32 is disposed in the shell 31 .

[0053] The outer shell 31 is a hollow cylindrical structure with an open upper end.

[0054] The filter plate 32 is a hemispherical shell structure, and the filter plate 32 protrudes downward.

[0055] It should be noted that a filter cloth (not shown in the figure) is provided on the filter plate 32. The filter cloth is a prior art and will not be described in detail here.

[0056] It should be noted that the filter plate 32 can be threadedly connected in the housing 31 , and the connection position between the housing 31 and the filter plate 32 has a smooth transition, and the space above the filter plate 32 corresponds to the lower pressing block 20 .

[0057] It should be noted that the bottom surface of the filter plate 32 may be in contact with the bottom inner wall of the outer shell 31, and there may be a gap between the bottom surface of the filter plate 32 and the bottom inner wall of the outer shell 31; if there is a gap, a support block (not shown in the figure) may be provided under the filter plate 32 to support the filter plate 32. The support block is a prior art and will not be described in detail here.

[0058] A plurality of inner passages 131 are defined in the pressure plate 13 , and the number of the inner passages 131 is the same as that of the outer shell 31 and they correspond one to one.

[0059] A water pipe 16 is provided at the bottom of the pressure plate 13 , and the bottom end of the inner passage 131 is communicated with the water pipe 16 , and the top end of the inner passage 131 is communicated with the inside of the outer shell 31 .

[0060] The top end of the inner passage 131 is located below the filter plate 32 , and the water delivery pipe 16 can be a rubber hose.

[0061] It should be noted that the water pipe 16 is used to transport filtered water, and the water pipe 16 can be connected to a water pump (not shown in the figure), which is a prior art and will not be described in detail here.

[0062] The power assembly is used to provide energy for the system operation, preferably an AC power supply or a battery; the control unit is used to control the coordinated operation of various components of the system, preferably a programmable logic controller; all of which are prior arts and will not be elaborated here.

[0063] It should be noted that a waste conveying device (not shown in the figure) may be provided below the lower pressing plate 12. The waste conveying device (such as a conveyor belt) is a prior art and will not be described in detail herein.

[0064] It can be understood that the sludge pump injects the sludge into the pressure cylinder 30 through the sludge pipe 15 and the inner tube 21, and the one-way valve 22 prevents backflow; the driving component 11 pushes the lower pressure plate 12, and the lower pressure block 20 is pressed into the pressure cylinder 30. After the sludge is compressed, the moisture enters the inner passage 131 through the filter plate 32 and is discharged through the water pipe 16; the filter cloth intercepts solid particles, and the filtrate is collected into the main water pipe 40 through the water pipe 16; after the filtration is completed, the motor 14 drives the pressure plate 13 to flip, so that the opening of the pressure cylinder 30 faces downward, so that the sludge falls, and the sludge that does not fall is demolded by manual pushing, and the pressure cylinder 30 in the flipped state is more convenient for manual demolding and cleaning; because the lower pressure block 20 and the pressure cylinder 30 are an upper and lower structure, and the inner passage 131 for water outlet is located at the bottom of the pressure cylinder 30, the sealing performance requirements between the lower pressure block 20 and the pressure cylinder 30 are lower than those of the prior art during the process of the lower pressure block 20 slowly pressing down.

[0065] In addition, in order to assist in demolding the sludge in the pressure cylinder 30, a water pipe 16 can be used in conjunction with a water pump to perform high-pressure flushing toward the inside of the pressure cylinder 30. This flushing method from the inside to the outside can more effectively flush away the sludge accumulated and blocked on the filter cloth.

[0066] Preferably, in this embodiment, a heating wire (not shown in the figure) may be embedded in the lower pressing block 20 for low-temperature heat source-assisted drying during the filter pressing process.

[0067] Preferably, a sealing ring (not shown in the figure) may be provided on the side wall of the lower pressing block 20 .

[0068] It is understandable that in this embodiment, the relevant personnel can choose to first control the lower pressure block 20 to extend into the pressure cylinder 30 and then control the inner tube 21 to transport the sludge toward the inside of the pressure cylinder 30, or can choose to first transport the sludge toward the inside of the pressure cylinder 30 through the inner tube 21, and then control the lower pressure block 20 to extend into the pressure cylinder 30; the specific operation method is selected according to actual needs and will not be described in detail here.

[0069] Additionally, a water flushing component (not shown in the figure) can also be provided on the mounting bracket 10 for periodically flushing the lower pressing block 20. The water flushing component is a prior art and will not be elaborated here.

[0070] Furthermore, for the usage scenario and overall processing flow of this application, an explanation is given here:

[0071] The sludge in the initial state is stored in the sludge storage tank. The sludge in the sludge storage tank is pumped into the screw press by the conditioning pump. Meanwhile, the dosing system performs primary dosing (PAM / PAC) on the screw press and precipitation occurs. The supernatant inside the screw press is discharged externally; the sludge after primary flocculation in the screw press is pumped into the sludge thickening tank by the pipeline pump for thickening. Meanwhile, during the thickening process, the dosing system performs secondary dosing (PAM / PAC) on the sludge thickening tank and precipitation occurs. The supernatant inside the sludge thickening tank is discharged externally; the sludge inside the sludge thickening tank enters the drying main machine through the feed pump, and then after pressurization and heating, it is transported into the sludge drying system with low-temperature heat pump technology of this application for pressure filtration and dehydration. The dehydrated sludge is transported into the vacuum system for vacuum drying. The vacuum pump in the vacuum system is used to extract the steam-water mixture in the sealed chamber, creating a certain vacuum degree in the chamber, thereby reducing the boiling point of water. The steam-water mixture extracted from the vacuum system is discharged after condensation; when the vacuum drying is completed, the remaining sludge is transported to a dedicated storage point for later disposal.

[0072] It should be noted that the components such as the sludge storage tank, conditioning pump, screw press, dosing system, pipeline pump, sludge thickening tank, feed pump, drying main machine, and vacuum system described above are all prior arts and are not shown in the figure, so they will not be elaborated here.

[0073] The technical solutions in the embodiments of this application at least have the following technical effects or advantages:

[0074] The bearing plate 13 can achieve the one-time dumping of the sludge blocks in all the pressure-bearing cylinders 30 under the drive of the motor 14; combined with the high-pressure reverse flushing function of the water delivery pipe 16, the filter cloth blockage is cleared from the inside out, improving the demoulding efficiency.

[0075] Embodiment 2: In the above embodiment, sludge may accumulate at the central position inside the pressure-bearing cylinder 30, resulting in uneven sludge distribution during the extrusion of the lower pressing block 20; the embodiment of this application is optimized on the basis of the above embodiment.

[0076] As Figures 5 to 7 shown, spiral grooves 311 are provided on the inner wall of the outer shell 31, and the spiral grooves 311 are located above the filter plate 32.

[0077] The inner pipe 21 is coaxially arranged with the lower pressing block 20, and the lower pressing block 20 is rotatably arranged on the bottom surface of the lower pressing plate 12.

[0078] It should be noted that the lower pressing block 20 can be rotatably arranged on the bottom surface of the lower pressing plate 12 by means of connection with an annular slide rail, and the lower pressing block 20 and the inner tube 21 can be slidably connected through a bearing, which is prior art and will not be described in detail herein.

[0079] A slider 23 is arranged on the side wall of the lower pressing block 20, and the shape of the slider 23 matches the shape of the spiral groove 311.

[0080] Among them, the slider 23 is located at the bottom end of the side wall of the cylindrical part of the lower pressing block 20.

[0081] Preferably, the slider 23 can be cylindrical, and the slider 23 can be rotatably arranged on the lower pressing block 20.

[0082] It should be noted that a rubber sealing layer can be arranged outside the slider 23 to ensure a certain sealing performance between the slider 23 and the spiral groove 311.

[0083] Preferably, the number of the spiral grooves 311 can be multiple, and the number of the sliders 23 is the same as and corresponds to the number of the spiral grooves 311 one by one, so that the process of the downward movement of the lower pressing block 20 is smoother and more fluent.

[0084] It should be noted that the number of the spiral grooves 311 can be 2, and the two spiral grooves 311 are combined into a double spiral wire groove.

[0085] Preferably, a guiding groove 312 is arranged at the top end of the outer shell 31, the bottom surface of the guiding groove 312 is inclined, and the bottom of the guiding groove 312 is communicated with the spiral groove 311.

[0086] It should be noted that the guiding groove 312 is a common structure in the prior art and is used to guide the slider 23 to slide into the spiral groove 311, which will not be described in detail herein.

[0087] It should be noted that the pitch and the number of turns of the spiral groove 311 are selected according to actual requirements and will not be described in detail herein.

[0088] Preferably, a sealing ring structure (not shown in the figure) can be arranged on the side wall of the lower pressing block 20, and the sealing ring is located above the slider 23.

[0089] It can be understood that the driving component 11 pushes the lower pressing plate 12 downward, and the slider 23 slides into the spiral groove 311 along the guiding groove 312, forcing the lower pressing block 20 to rotate while pressing downward. The lower pressing block 20 rotates to squeeze the sludge, and the centrifugal force causes the sludge to spread outward to the periphery, evenly covering the surface of the filter plate 32. The sludge comes into contact with the filter plate 32 more fully. At the same time, the filtrate enters the inner passage 131 through the filter cloth and is discharged through the water delivery pipe 16. The rotation of the lower pressing block 20 may drive the relative movement between the spiral groove 311 and the slider 23, forming a scraping effect on the surface of the filter cloth to reduce the blockage of the filter holes. When the lower pressing block 20 retracts, the separation of the spiral groove 311 from the slider 23 forms a "spiral lifting" action to assist in separating the filter cake from the filter plate 32. At the same time, during the rotation of the lower pressing block 20, part of the sludge adhering to the lower pressing block 20 will also fall off better.

[0090] The technical solutions in the embodiments of the present application at least have the following technical effects or advantages:

[0091] 1. The lower pressing block 20 rotates during the downward pressing process, forcing the sludge to spread evenly from the center to the periphery and cover the surface of the filter plate 32, avoiding uneven distribution of the pressure filtration due to central accumulation.

[0092] 2. Under the combined force field of rotation and downward pressing of the sludge, a shearing force and an extrusion force act synergistically to destroy the colloidal structure of the sludge and release the bound water.

[0093] 3. When the lower pressing block 20 rotates, the relative movement between the slider 23 and the spiral groove 311 forms a periodic scraping on the surface of the filter cloth, reducing the blockage of the filter holes and maintaining the stability of the filtrate flux.

[0094] 4. When the lower pressing block 20 retracts, the slider 23 moves in the opposite direction along the spiral groove 311, driving the lower pressing block 20 to spiral upward, generating a "lifting - peeling" effect, making the separation of the sludge from the filter plate 32 more thorough and reducing manual intervention.

[0095] Embodiment 3: In the above - mentioned embodiment, if there is less sludge inside the pressure - bearing cylinder 30 when the lower pressing block 20 is moving downward, at this time, the contact area between the lower pressing block 20 and the filter plate 32 is relatively large, and the rotating lower pressing block 20 may cause a certain degree of lateral pulling on the filter cloth on the filter plate 32. The embodiment of the present application is optimized on the basis of the above - mentioned embodiment.

[0096] As Figure 8 shown, a vertical groove 313 is formed on the inner wall of the housing 31, and the vertical groove 313 is located above the filter plate 32.

[0097] The vertical groove 313 is vertically arranged, and the top of the vertical groove 313 is communicated with the bottom of the spiral groove 311. The shape of the vertical groove 313 matches the shape of the slider 23.

[0098] It should be noted that the length of the vertical groove 313 is selected according to actual requirements and will not be elaborated here.

[0099] It should be noted that when the number of the spiral grooves 311 is multiple, the number of the spiral grooves 311 is the same as that of the vertical grooves 313 and they correspond to each other one by one.

[0100] It can be understood that when the slider 23 slides along the spiral groove 311, the lower pressing block 20 is in a rotating state at this time. When the slider 23 slides into the vertical groove 313, the lower pressing block 20 moves vertically downward; so that the rotation speed is relatively fast at the beginning of the downward pressing of the lower pressing block 20 to help spread the sludge, and it no longer rotates in the high-pressure stage and focuses on extrusion.

[0101] The technical solutions in the embodiments of the present application at least have the following technical effects or advantages:

[0102] During the vertical downward movement of the lower pressing block 20, the lateral pulling force on the filter cloth is reduced, and the service life of the filter cloth is improved.

[0103] Embodiment 4: In the above embodiment, if the viscosity of the sludge to be treated is relatively high, it may occur that part of the sludge adheres to the bottom of the lower pressing block 20; the embodiment of the present application is optimized to a certain extent on the basis of the above embodiment.

[0104] As Figures 9 to 12 shown, a main water pipe 40 is arranged on the lower pressing plate 12, and a plurality of branch water pipes 41 are arranged on the water injection passage 26.

[0105] The number of the branch water pipes 41 is the same as that of the lower pressing blocks 20 and they correspond to each other one by one.

[0106] Among them, the main water pipe 40 and the branch water pipes 41 can be corrugated pipes.

[0107] It should be noted that the branch water pipe 41 is a corrugated pipe, so that the lower pressing block 20 will not be affected by the branch water pipe 41 during the rotation process, and during the reset process of the branch water pipe 41, it can play a role in assisting the reset of the lower pressing block 20; the main water pipe 40 can be a corrugated pipe, so that during the up and down movement of the lower pressing plate 12, the main water pipe 40 can move accordingly.

[0108] A hemispherical diaphragm 24 is arranged at the bottom of the lower pressing block 20, and an inner opening is formed at the bottom of the diaphragm 24.

[0109] The outer opening of the diaphragm 24 is hermetically sleeved on the outer wall of the lower pressing block 20, the inner opening of the diaphragm 24 is hermetically connected to the bottom of the lower pressing block 20, and the bottom end opening of the inner pipe 21 is located in the inner opening of the diaphragm 24, so that the diaphragm 24 will not affect the operation of the inner pipe 21.

[0110] Among them, the material of the diaphragm 24 is rubber, such as nitrile rubber.

[0111] The inner part of the lower pressing block 20 is provided with a water injection passage 26. The top end of the water injection passage 26 is communicated with the corresponding water injection passage 26, and the bottom end of the water injection passage 26 is communicated with the space between the diaphragm 24 and the lower pressing block 20.

[0112] It should be noted that a pressure sensor can be arranged in the space between the diaphragm 24 and the lower pressing block 20 to detect the pressure after water injection inside.

[0113] It can be understood that during the process of squeezing the sludge, water is conveyed into the inside of the diaphragm 24 through the main water pipe 40 and the branch water pipes 41, so that the diaphragm 24 expands to further squeeze the sludge, and this squeezing process makes the force on the sludge more uniform; at the same time, when the lower pressing block 20 rises, since the diaphragm 24 is in an expanded state, the diaphragm 24 can better scrape the sludge off the filter plate 32; and when the lower pressing block 20 rises, the diaphragm 24 can be controlled to expand and contract intermittently to generate vibration, and through this vibration, part of the sludge on the diaphragm 24 and the sludge on the filter plate 32 can be better demolded.

[0114] Preferably, the main water pipe 40 can inject hot water into the diaphragm 24 (at this time, it is no longer necessary to embed heating wires inside the lower pressing block 20), which can heat the sludge, not only facilitating water evaporation but also facilitating subsequent vacuum drying operations; the hot water can be recycled and heated again by an air source heat pump water heater (not shown in the figure) for the next use, forming a closed-loop cycle. The air source heat pump water heater is a prior art and will not be described in detail here.

[0115] Furthermore, as Figure 11 and Figure 12 shown, a plurality of scraping blades 25 are evenly arranged on the diaphragm 24.

[0116] Among them, the material of the scraping blade 25 is the same as that of the diaphragm 24.

[0117] It should be noted that the plurality of scraping blades 25 can be 3, 4, 5, 6 scraping blades 25, etc. The specific quantity and distribution are selected according to actual needs and will not be described in detail here.

[0118] Preferably, the width of the scraping blade 25 can be 2 cm to 5 cm.

[0119] Preferably, the inside of the scraping blade 25 is hollow, and the internal space of the scraping blade 25 is communicated with the space between the diaphragm 24 and the lower pressing block 20.

[0120] It should be noted that during the upward movement of the lower pressing block 20, the scraping blade 25 can stand up smoothly under the action of water pressure to smoothly realize its function.

[0121] It should be noted that the size of the scraping blade 25 is selected according to actual needs and will not be described in detail here.

[0122] It can be understood that when the lower pressing block 20 moves downward, the scraping blade 25 can scrape the sludge, spread the sludge evenly, and the scraping blade 25 is made of a flexible material. With the extrusion of the lower pressing block 20, the scraping blade 25 can adaptively deform and will not affect the extrusion process of the lower pressing block 20; the water pressure causes the diaphragm 24 to expand outward, pushing the scraping blade 25 to unfold. The lower pressing block 20 rises with the driving component 11. At the same time, the motor 14 drives the bearing plate 13 to rotate, and the rotation of the scraping blade 25 is linked with that of the lower pressing block 20 to scrape the sludge adhering to the bottom.

[0123] The technical solutions in the embodiments of the present application at least have the following technical effects or advantages:

[0124] 1. By injecting water into the diaphragm 24 through the main water pipe 40 and the branch water pipes 41, after the diaphragm 24 expands, it evenly presses on the sludge, improving the uniformity of dehydration;

[0125] 2. When the lower pressing block 20 retracts, the diaphragm 24 remains in the expanded state. Utilizing the difference in adhesion force between the flexible diaphragm 24 and the contact surface of the sludge, the sludge is peeled off from the surface of the filter plate 32; further, through the vibration generated by the intermittent expansion and contraction of the diaphragm 24, the adhesion force between the sludge and the lower pressing block 20 is destroyed, enabling the sludge to fall off better;

[0126] 3. When the lower pressing block 20 rotates and presses downward, the scraping blade 25 bends adaptively with the resistance of the sludge, avoiding the damage to the structure of the filter plate 32 caused by rigid scraping, and at the same time spreading the sludge layer to a certain extent;

[0127] 4. The expansion pressure of the diaphragm 24 can be dynamically adjusted, and the extrusion intensity is controlled by the water injection volume to meet the pressure filtration requirements of sludge with different viscosities, avoiding local overpressure resulting in filter cloth damage or underpressure resulting in insufficient dehydration;

[0128] 5. When the lower pressing block 20 rises, the motor 14 drives the bearing plate 13 to rotate, and the expanded diaphragm 24 and the scraping blade 25 jointly form a "rotating scraper" effect to further remove the residual sludge at the bottom of the filter plate 32 and the lower pressing block 20.

[0129] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A sludge drying system using low-temperature heat pump technology, characterized in that, It includes a mounting frame, a lower pressing plate and a bearing plate; On the bottom surface of the top of the mounting frame, a plurality of vertically arranged driving components are provided, and the bottom end of the driving component is connected to the lower pressing plate; A plurality of lower pressing blocks are provided on the bottom surface of the lower pressing plate; The bearing plate is rotatably arranged on the mounting frame, and the bearing plate is located below the lower pressing block; A plurality of bearing cylinders are provided on the top surface of the bearing plate; A motor is provided on the mounting frame, and the output shaft of the motor passes through the mounting frame and is connected to the bearing plate to drive the bearing plate to rotate; The number of the lower pressing blocks and the bearing cylinders is the same and they correspond one by one, and the bearing cylinder is located below the corresponding lower pressing block; The shape of the internal space of the bearing cylinder corresponds to and is the same as the shape of the lower pressing block; A sludge pipe is provided on the lower pressing plate, and an inner pipe is provided inside the lower pressing block. The top of the inner pipe passes through the lower pressing plate and is communicated with the sludge pipe, and the bottom of the inner pipe is communicated with the space below the lower pressing block; A plurality of inner passages are opened in the bearing plate, and the number of the inner passages is the same as that of the bearing cylinders and they correspond one by one; A water delivery pipe is provided at the bottom of the bearing plate, and the bottom end of the inner passage is communicated with the water delivery pipe, and the top end of the inner passage is communicated with the inside of the bearing cylinder.

2. The low-temperature heat pump technology sludge drying system according to claim 1, characterized in that The bottom end opening of the inner pipe is provided with a one-way valve. The upper part of the one-way valve is the input end, and the lower part of the one-way valve is the output end.

3. The sludge drying system with low-temperature heat pump technology according to claim 1, characterized in that, The bearing cylinder includes a housing and a filter plate, and the filter plate is arranged inside the housing; The filter plate is a hemispherical shell structure, and the filter plate protrudes downward, and a filter cloth is provided on the filter plate; The lower pressing block is a coaxial combination of upper and lower parts. The upper part of the lower pressing block is a cylindrical main body, the lower part of the lower pressing block is a hemispherical base, and the upper and lower parts of the lower pressing block are smoothly transitioned through a tangent surface.

4. The low-temperature heat pump technology sludge drying system according to claim 3, wherein The filter plate is threadedly connected inside the housing, and the connection position between the housing and the filter plate is smoothly transitioned, and the space above the filter plate corresponds to the lower pressing block.

5. The low-temperature heat pump technology sludge drying system according to claim 3, characterized in that, A spiral groove is opened on the inner wall of the housing, and the spiral groove is located above the filter plate; The inner pipe is coaxially arranged with the lower pressing block, and the lower pressing block is rotatably arranged on the bottom surface of the lower pressing plate; A sliding block is provided on the side wall of the lower pressing block, and the shape of the sliding block matches the shape of the spiral groove; 6. The low-temperature heat pump technology sludge drying system according to claim 5, characterized in that A circle of guiding grooves is provided at the top end of the housing, the bottom surface of the guiding groove is inclined, and the bottom of the guiding groove is communicated with the spiral groove; 7. The low-temperature heat pump technology sludge drying system according to claim 5, characterized in that, A vertical groove is opened on the inner wall of the housing, and the vertical groove is located above the filter plate; The vertical groove is vertically arranged, the top end of the vertical groove is communicated with the bottom of the spiral groove, and the shape of the vertical groove matches the shape of the sliding block; 8. The low-temperature heat pump technology sludge drying system according to claim 1, characterized in that A main water pipe is provided on the lower pressing plate, and a plurality of branch water pipes are provided on the water injection passage; The number of the branch water pipes is the same as that of the lower pressing blocks and they correspond one by one; The bottom of the lower pressing block is provided with a hemispherical diaphragm, and an inner opening is opened at the bottom of the diaphragm; The outer opening of the diaphragm is hermetically sleeved on the outer wall of the lower pressing block, the inner opening of the diaphragm is hermetically connected to the bottom of the lower pressing block, and the bottom end opening of the inner pipe is located inside the inner opening of the diaphragm, so that the diaphragm does not affect the operation of the inner pipe; An inner water injection passage is provided inside the lower pressing block. The top end of the inner water injection passage is communicated with the corresponding water injection passage, and the bottom end of the inner water injection passage is communicated with the space between the diaphragm and the lower pressing block.

9. The sludge drying system using low-temperature heat pump technology as claimed in claim 8, wherein, A plurality of scraping blades are uniformly arranged on the diaphragm; 10. The low-temperature heat pump technology sludge drying system according to claim 9, characterized in that, The inside of the scraping blade is hollow, and the internal space of the scraping blade is communicated with the space between the diaphragm and the lower pressing block.

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