Candle type filter

Abstract

The invention belongs to the technical field of filtering equipment, and particularly relates to a candle filter which comprises a filtering tank, filter element pipes are arranged in the filtering tank and connected with a liquid collecting pipe, a scraping plate is arranged on the inner wall of the filtering tank in a sliding mode, a plurality of cake scraping mechanisms are arranged on the scraping plate, each cake scraping mechanism is provided with a plurality of scraping plate holes, and the scraping plate holes correspond to the filter element pipes in a one-to-one mode. The diameter of the scraper hole is larger than the outer diameter of the filter element pipe, the filter element pipe penetrates through the scraper hole, a scraper assembly is arranged in the scraper hole, a first liquid inlet is formed in the bottom of the filtering tank, a second liquid inlet is formed in the upper end cover, and the first liquid inlet is connected with a stock solution tank and a waste liquid tank through a pipeline provided with a first electric control valve; and the second liquid inlet is connected with the stock solution tank and the waste liquid tank through a pipeline provided with a second control valve. According to the candle filter provided by the invention, the scraper assembly can scrape off the outer wall of the filter cake layer in the filtering process, so that the filter cake layer is always in the optimal filtering effect range, the filtering effect is ensured, and meanwhile, the filtering efficiency is also improved.

Description

Technical Field

[0001] The invention belongs to the technical field of filtering equipment, and in particular relates to a candle filter. Background Art

[0002] Candle filter is a relatively advanced, safe, efficient and pollution-free new filtering equipment. It has the characteristics of high efficiency and energy saving, closed and high precision, easy maintenance, safety and reliability, and a high degree of automation. It is widely used in solid-liquid separation and filtration in industries such as petroleum, plastics, electroplating, chemicals, ceramics, pharmaceuticals, and sugar making.

[0003] As one of the ideal filters for solid-liquid separation, the candle filter is composed of a raw liquid tank, a filter tank, a liquid collecting tank, a control box and an automatic control valve. The filter tank is provided with a filter element, and the filter element is provided with a filter cloth. When the candle filter is working, the raw liquid to be filtered starts to enter the filter from the raw liquid tank. When the filter is filled with liquid and the gas in the shell is emptied, the top exhaust valve and the overflow pipeline will automatically close and start filtering. The raw liquid to be filtered passes through the filter cloth and enters the filter element. The filter cloth filters the impurities in the raw liquid. As the filtering process proceeds, the filtered impurities form on the surface of the filter cloth. The filter cake layer also plays a certain filtering role on the original liquid. The pressure difference between the inside and outside of the filter element will gradually increase as the filter cake layer becomes thicker, and the filtering effect will become better and better. As the thickness of the filter cake layer on the filter cloth becomes larger and larger, the original liquid permeability of the filter cake layer becomes lower and lower, and the filtering efficiency becomes lower and lower. At this time, the filter cake layer needs to be cleaned. Backwashing is usually used in the prior art, but the backwashing cleaning effect is not good during use. Generally, after backwashing several times, the filter tank needs to be disassembled to clean the filter cake layer. After cleaning, the filter tank is assembled again, which is cumbersome and time-consuming.

[0004] In the patent with patent application number CN202122771814.3, a new candle filter is proposed, including a filter tank, a filter element, an internal collecting pipe, an ultrasonic vibration rod, an ultrasonic driving power supply and a liquid level switch. A filter element is arranged inside the filter tank, and the top of the filter element is connected to the internal collecting pipe. Through the setting of the filter element and the internal collecting pipe, the material can be collected and filtered. An ultrasonic vibration rod is arranged on one side of the filter element, and one end of the ultrasonic vibration rod is connected to the ultrasonic driving power supply. Through the setting of the ultrasonic vibration rod and the ultrasonic driving power supply, ultrasonic waves can be emitted, and by adjusting the frequency of ultrasonic waves, the filter element can be cleaned online to achieve cleaning and regeneration of the filter element, reduce the labor and time of disassembling the filter element, reduce the risk of damage to the filter element, and improve the use efficiency and service life.

[0005] However, when using ultrasonic cleaning technology, the filter cake layer will usually be completely cleaned away. After cleaning, the original liquid to be filtered needs to form a filter cake layer of a certain thickness on the filter cloth again to achieve the best filtration effect. This process takes a certain amount of time, and during this period of time, the filtration effect is not good, which affects the filtration efficiency and filtration quality to a certain extent. Summary of the invention

[0006] The object of the present invention is to provide a candle filter to solve the technical problems raised in the above background technology.

[0007] In order to achieve the above technical objectives, the technical solution of the present invention is: A candle filter comprises a filter tank, wherein an upper end cover is arranged on the top of the filter tank, a material drop opening is arranged on the bottom of the filter tank, a plurality of filter core tubes are arranged inside the filter tank, a filter cloth sleeve is arranged outside the filter core tube, a plurality of liquid collecting pipes are fixedly arranged on the filter tank, a plurality of the filter core tubes are correspondingly connected to the liquid collecting pipes, a plurality of slide rails are arranged on the inner wall of the filter tank, the extension direction of the slide rails is parallel to the axial direction of the filter tank, and a scraper is arranged inside the filter tank to slide along the slide rails; The scraper is provided with a plurality of scraper mechanisms, and the scraper mechanisms are provided with a plurality of scraper holes, the scraper holes correspond to the filter tubes one by one, the aperture of the scraper holes is larger than the outer diameter of the filter tube, and the filter tube passes through the scraper holes; A first liquid inlet is provided at the bottom of the filter tank, and a second liquid inlet is provided on the upper end cover. The first liquid inlet is connected to the raw liquid tank and the waste liquid tank through a pipeline provided with a first solenoid valve, and the second liquid inlet is connected to the raw liquid tank and the waste liquid tank through a pipeline provided with a second solenoid valve.

[0008] As an improvement, the scraper mechanism includes a scraper shell fixedly connected to the scraper, the scraper shell is provided with a plurality of scraper holes, the scraper holes penetrate the scraper shell, at least one scraper assembly mounting groove is provided in the scraper shell, and a scraper assembly is slidably provided in the scraper assembly mounting groove.

[0009] As a further improvement, the scraper assembly includes a first scraper mounting plate and a second scraper mounting plate slidably connected to the scraper mounting groove, the first scraper mounting plate is provided with a first scraper mounting groove, the second scraper mounting plate is provided with a second scraper mounting groove, a first scraper is provided in the first scraper mounting groove and the second scraper mounting groove, one end of the first scraper mounting plate is fixedly connected to a first rack, one end of the second scraper mounting plate is fixedly connected to a second rack, and the first rack and the second rack are arranged opposite to each other; At least one adjusting rod is rotatably provided in the scraper shell, the top end of the adjusting rod passes through the top of the scraper shell and extends out of the scraper shell, an adjusting knob is fixedly provided on the top end of the adjusting rod, a gear is fixedly provided on the adjusting rod, and the gear is meshed with the first rack and the second rack.

[0010] As a further improvement, the cross-sections of the first scraper installation groove and the second scraper installation groove are both semicircular, and the first scraper is in a semicircular ring shape; The inner wall of the scraper hole is fixedly connected with a second scraper, and the second scraper is in a circular ring shape.

[0011] As a further improvement, a plurality of latching grooves are provided at the bottom of the adjusting knob, and at least one group of latching members are provided at the top of the scraper shell, and the latching members are latched with the latching grooves.

[0012] As a further improvement, the locking member includes a locking spring and a locking bead, one end of the locking spring is fixedly connected to the top of the scraper cake shell, and the other end is fixedly connected to the locking bead, and the locking bead is slidably connected to the locking groove.

[0013] As a further improvement, the upper end cover is provided with a back-blowing air inlet, and a third solenoid valve is provided on each of the plurality of liquid collecting pipes, and the liquid collecting pipes are connected to the liquid collecting tank and the back-blowing air inlet; The first solenoid valve, the second solenoid valve and the third solenoid valve are connected to an electric control box.

[0014] As a further improvement, the upper end cover is provided with a filter tank pressure sensor, the liquid collecting tank and the liquid collecting pipe are connected through a liquid outlet pipe, the liquid outlet pipe is provided with a liquid outlet pressure sensor, the first liquid inlet is connected to the raw liquid tank through a first liquid inlet pipe, the second liquid inlet is connected to the raw liquid tank through a second liquid inlet pipe, and the first liquid inlet pipe and the second liquid inlet pipe are both provided with a liquid inlet pressure sensor; The filter tank pressure sensor, the liquid outlet pressure sensor and the liquid inlet pressure sensor are all connected to the electric control box with electrical signals.

[0015] As a further improvement, the upper end cover is provided with a cleaning pipe, one end of the cleaning pipe extends into the filter tank, and the other end is connected to a positive blowing air inlet pipe and a cleaning water inlet pipe through a cleaning valve. The end of the cleaning pipe extending into the filter tank is provided with a nozzle, and the nozzle is provided with a plurality of openings.

[0016] As a further improvement, an upper limit piece is provided at one end of the slide rail, and a lower limit piece is provided at the other end. A scraper is provided in the filter tank and slides along the slide rail. The upper limit piece and the lower limit piece are used to limit the sliding range of the scraper. The position of the upper limit piece corresponds to the top end of the filter cloth cover, and the position of the lower limit piece corresponds to the bottom end of the filter cloth cover.

[0017] Due to the adoption of the above technical solution, the beneficial effects of the present invention are: The candle filter provided by the present invention is provided with a scraper, and a plurality of scraper mechanisms are provided on the scraper, and the scraper mechanism is provided with a plurality of scraper holes. After the candle filter has been used for a long time, the thickness of the filter cake layer on the internal filter element tube is too large, so as to affect the filtering efficiency of the candle filter. At this time, the first solenoid valve, the second solenoid valve and the third solenoid valve are controlled to close the first liquid inlet and the raw liquid tank, connect the first liquid inlet with the waste liquid tank, connect the second liquid inlet with the raw liquid tank, and the raw liquid enters the filter tank from the second liquid inlet. The raw liquid pushes the scraper to move downward, and the scraper mechanism removes the filter cake outside the filter element tube. A part of the layer is scraped off, so that the filter cake layer outside the filter element tube is at a thickness suitable for filtration. At this time, the first solenoid valve, the second solenoid valve and the third solenoid valve are controlled to close the second liquid inlet and the raw liquid tank, connect the second liquid inlet with the waste liquid tank, and close the first liquid inlet and connect with the raw liquid tank. The raw liquid enters the filter tank from the first liquid inlet, and the raw liquid pushes the scraper to move upward and return to its original position. The filter element tube continues to filter the raw liquid, so that the filter element tube maintains a filter cake layer of appropriate thickness for filtration. After cleaning the filter cake layer, there is no need to accumulate filter cake for a certain period of time, thereby improving the filtration efficiency and filtration quality.

[0018] The candle filter provided by the present invention is provided with a scraper assembly, which can scrape off the outer wall of the filter cake layer during the filtering process so that the filter cake layer is always within the optimal filtering effect range, thereby improving the filtering effect and the filtering efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of an embodiment of the present invention; Figure 2 It is a three-dimensional structural diagram of the filter tank; Figure 3 It is a schematic diagram of the internal structure of the filter tank; Figure 4 It is a schematic diagram of the structure of the scraper; Figure 5 It is a structural schematic diagram of the first state of the cake scraping mechanism; Figure 6 It is a structural schematic diagram of the second state of the cake scraping mechanism; Figure 7 It is a structural schematic diagram of the third state of the cake scraping mechanism; Figure 8 It is a comparison chart of different states of the cake scraping mechanism; Fig. 9 is a schematic diagram of the structure of the scraper assembly; Fig.10 is a structural schematic diagram of the scraper assembly in another state; Among them: 1-filter tank; 11-feeding port; 12-first liquid inlet; 121-first solenoid valve; 13-slide rail; 131-upper limiter; 132-lower limiter; 14-liquid collecting pipe; 141-third solenoid valve; 2-upper end cover; 21-second liquid inlet; 211-second solenoid valve; 22-safety valve; 23-filter tank pressure sensor; 24-backflush air inlet; 3-filter element tube; 4-scraper; 41-slideway; 5-scraping mechanism; 51-scraping Shell; 52-scraper hole; 53-second scraper; 54-scraper assembly mounting groove; 6-scraper assembly; 61-first scraper mounting plate; 611-first rack; 62-second scraper mounting plate; 621-second rack; 63-first scraper mounting groove; 64-second scraper mounting groove; 65-first scraper; 66-adjusting rod; 67-adjusting knob; 68-gear; 7-cleaning tube; 71-cleaning valve; 8-raw liquid tank; 9-waste liquid tank; 10-liquid collecting tank. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with specific implementation methods and drawings. The drawings are only for illustrative purposes and are only schematic diagrams, not actual drawings, and should not be construed as limiting the present application. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. It is understandable to those skilled in the art that some well-known structures and their descriptions in the drawings may be omitted.

[0021] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on the present application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0022] like Figure 1-10As shown, a candle filter comprises a filter tank 1, the top of the filter tank 1 is provided with an upper end cover 2, the bottom of the filter tank 1 is provided with a drop port 11, a plurality of filter element tubes 3 are provided in the filter tank 1, and a filter cloth sleeve is provided outside the filter element tube 3. Specifically, the filter element tube 3 comprises a central tube arranged at the central position inside the filter element tube 3, the external fixing ring of the central tube is provided with six filter tubes, the filter cloth sleeve sleeves the six filter tubes and the central tube inside, the filter tank 1 is fixedly provided with a plurality of liquid collecting pipes 14, the plurality of filter element tubes 3 are correspondingly connected to the liquid collecting pipes 14, the inner wall of the filter tank 1 is provided with a plurality of slide rails 13, the extension direction of the slide rail 13 is parallel to the axial direction of the filter tank 1, a scraper 4 is provided in the filter tank 1 along the slide rail 13 for sliding, the scraper 4 is slidably connected to the inner wall of the filter tank 1, specifically, in this embodiment, a slide groove 41 is provided at a position corresponding to the slide rail 13 on the scraper 4, and the slide groove 41 is slidably matched with the slide rail 13.

[0023] The scraper 4 is provided with a plurality of scraper mechanisms 5, and the scraper mechanisms 5 are provided with a plurality of scraper holes 52. The scraper holes 52 correspond to the filter tubes 3 one by one. The aperture of the scraper holes 52 is larger than the outer diameter of the filter tubes 3. The filter tubes 3 pass through the scraper holes 52. The scraper mechanisms 5 are used to scrape off the outer side of the filter cake layer, so that the filter cake layer becomes thinner and reaches a thickness with a better filtering effect again. The cleaned filter cake layer falls out of the filter tank 1 from the drop port 11. The entire scraper operation not only ensures the filtration rate, but also ensures the filtration effect.

[0024] The scraper mechanism 5 includes a scraper shell 51 fixedly connected to the scraper 4. The scraper shell 51 is provided with a plurality of scraper holes 52. The scraper holes 52 penetrate the scraper shell 51. At least one scraper assembly mounting groove 54 is provided in the scraper shell 51. A scraper assembly 6 is slidably provided in the scraper assembly mounting groove 54. In this embodiment, two groups of scraper assembly mounting grooves 54 are provided in the scraper shell 51, one group of scraper assembly mounting grooves 54 is located above the other group of scraper assembly mounting grooves 54, and a scraper assembly 6 is slidably provided in each scraper assembly mounting groove 54.

[0025] The scraper assembly 6 includes a first scraper mounting plate 61 and a second scraper mounting plate 62 which are slidably connected to the scraper assembly mounting groove 54. The first scraper mounting plate 61 and the second scraper mounting plate 62 are arranged opposite to each other. The first scraper mounting plate 61 is provided with a first scraper mounting groove 63, and the second scraper mounting plate 62 is provided with a second scraper mounting groove 64. The first scraper mounting groove 63 and the second scraper mounting groove 64 are arranged opposite to each other. The first scraper mounting groove 63 and the second scraper mounting groove 64 are both provided with a first scraper 65. One end of the first scraper mounting plate 61 is fixedly connected to the first rack 611, and one end of the second scraper mounting plate 62 is fixedly connected to the second rack 621. The first rack 611 and the second rack 621 are arranged opposite to each other.

[0026] Furthermore, at least one adjusting rod 66 is rotatably provided in the scraper shell 51, and the top end of the adjusting rod 66 passes through the top of the scraper shell 51 and extends out of the scraper shell 51, and an adjusting knob 67 is fixedly provided on the top end of the adjusting rod 66, and a gear 68 is fixedly provided on the adjusting rod 66, and the gear 68 is located between the first rack 611 and the second rack 621, and the gear 68 is meshed with the first rack 611 and the second rack 621. The rotation of the adjusting knob 67 drives the adjusting rod 66 to rotate, and the rotation of the adjusting rod 66 drives the gear 68 to rotate, and the rotation of the gear 68 drives the first rack 611 and the second rack 621 to move, the first rack 611 drives the first scraper mounting plate 61 to move, and the second rack 621 drives the second scraper mounting plate 62 to move.

[0027] Furthermore, the cross-sections of the first scraper mounting groove 63 and the second scraper mounting groove 64 are both semicircular, and the first scraper 65 is in a semicircular ring shape. When the first scraper mounting plate 61 and the second scraper mounting plate 62 abut against each other, the first scrapers 65 thereon form a scraper hole; the inner wall of the scraper hole 52 is fixedly connected with the second scraper 53, and the second scraper 53 is in a circular ring shape. The aperture of the second scraper 53 is larger than the aperture of the scraper hole formed by the two first scrapers 65 abutting against each other. In actual use, the first scraper 65 and the second scraper 53 can also be set to other shapes to match the shape of the filter element tube, so as to facilitate maintaining a uniform thickness of the filter cake layer during the scraper operation.

[0028] When in use, the adjusting knob 67 is turned, and the adjusting knob 67 drives the adjusting rod 66 to rotate, and the adjusting rod 66 drives the gear 68 to rotate, and the gear 68 drives the first rack 611 and the second rack 621 to move, and the first rack 611 drives the first scraper mounting plate 61 to move, and the second rack 621 drives the second scraper mounting plate 62 to move, so that the first scraper mounting plate 61 and the second scraper mounting plate 62 abut against or separate, so that the first scraper mounting groove 63 and the first scraper 65 in the second scraper mounting groove 64 abut against or separate, and further Specifically, when the first scraper mounting plate 61 and the second scraper mounting plate 62 abut against each other, the two first scrapers 65 form a scraper hole. Specifically, the apertures of the scraper holes formed by the abutment of the first scrapers 65 in different scraper assembly mounting grooves 54 are different. In this embodiment, the aperture of the scraper hole formed by the abutment of the second scraper 53 is larger than the aperture of the scraper hole formed by the abutment of the first scraper 65, and the aperture of the scraper hole formed by the abutment of the first scraper 65 in the scraper assembly mounting groove 54 located above is smaller than the aperture of the scraper hole formed by the abutment of the first scraper 65 in the scraper assembly mounting groove 54 located below.

[0029] Furthermore, a plurality of locking grooves are provided at the bottom of the adjusting knob 67, and at least one group of locking parts are provided at the top of the scraper cake shell 51. The locking parts are engaged with the locking grooves, and the locking parts include a locking spring and a locking bead. One end of the locking spring is fixedly connected to the top of the scraper cake shell 51, and the other end is fixedly connected to the locking bead. The locking bead is slidably engaged with the locking groove. After the adjusting knob 67 is rotated, the locking bead and the locking groove are abutted against each other, so that the adjusting knob 67 is fixed to the scraper cake shell 51. The locking grooves and the locking parts are conventional technical means in the field and will not be described in detail here.

[0030] A first liquid inlet 12 is provided at the bottom of the filter tank 1, and a second liquid inlet 21 is provided on the upper end cover 2. The first liquid inlet 12 is respectively connected to the raw liquid tank 8 and the waste liquid tank 9 through a pipeline provided with a first solenoid valve 121, and the second liquid inlet 21 is respectively connected to the raw liquid tank 8 and the waste liquid tank 9 through a pipeline provided with a second solenoid valve 211. During use, the scraper plate will move up or down due to liquid inlet into the first liquid inlet 12 or the second liquid inlet 21, thereby driving the scraper assembly 6 to realize the scraping operation.

[0031] The upper end cover 2 is provided with a back-blowing air inlet 24, the collecting pipe 14 is connected to the collecting tank 10 and the back-blowing air inlet 24, and a third solenoid valve 141 is provided on multiple collecting pipes 14. The first solenoid valve 121, the second solenoid valve 211 and the third solenoid valve 141 are connected to an electrical control box. Specifically, the first solenoid valve 121 and the second solenoid valve 211 are both three-position three-way solenoid valves.

[0032] The upper end cover 2 is provided with a filter tank pressure sensor 23 for detecting the pressure in the filter tank 1. The liquid collecting tank 10 and the liquid collecting pipe 14 are connected by a liquid outlet pipe. The liquid outlet pipe is provided with a liquid outlet pressure sensor for detecting the pressure in the liquid outlet pipe. When the pressure in the filter tank 1 reaches the set minimum filtration pressure value, the filter tank pressure sensor 23 triggers a signal to the electrical control box, and the electrical control box sends a control signal to the third solenoid valve 141, so that the liquid collecting pipe 14 and the liquid outlet pipe are connected, so that the filtered liquid enters the liquid collecting tank 10; when the pressure in the filter tank 1 reaches the set maximum filtration pressure value, or the pressure in the liquid outlet pipe is lower than the set minimum liquid outlet pressure value, the filter tank pressure sensor 23 or the liquid outlet pressure sensor triggers a signal to the electrical control box, and the electrical control box sends a control signal to the third solenoid valve 141, so that the liquid collecting pipe 14 and the liquid outlet pipe are closed, and the scraping operation is performed.

[0033] The first liquid inlet 12 is connected to the raw liquid tank 8 through a first liquid inlet pipe, and the second liquid inlet 21 is connected to the raw liquid tank 8 through a second liquid inlet pipe. Liquid inlet pressure sensors are provided on the first liquid inlet pipe and the second liquid inlet pipe to detect the pressure in the first liquid inlet pipe and the second liquid inlet pipe. The filter tank pressure sensor 23, the liquid outlet pressure sensor and the liquid inlet pressure sensor are all connected to the electrical control box with electrical signals.

[0034] The upper end cover 2 is provided with a cleaning pipe 7, one end of which extends into the filter tank 1, and the other end is connected to the positive blowing air inlet pipe and the cleaning water inlet pipe through a cleaning valve 71. The end of the cleaning pipe 7 extending into the filter tank 1 is provided with a nozzle, and the nozzle is provided with a plurality of openings.

[0035] When the candle filter provided in this embodiment is cleaned, the electrical control box sends a control signal to the cleaning valve 71, so that the positive blowing air inlet pipe is connected to the filter tank 1, and the positive blowing gas enters the filter tank 1 to press out the original liquid and the filtered liquid in the filter tank 1, and then blows out the filter cake layer. The electrical control box sends a control signal to the cleaning valve 71 and the third solenoid valve 141, so that the liquid collecting pipe 14 and the liquid outlet pipe are closed, and the liquid collecting pipe 14 is connected to the back-blowing air inlet 24 to blow down the filter cake layer. The electrical control box sends a control signal to the cleaning valve 71, so that the cleaning water inlet pipe is connected to the filter tank 1 to perform the cleaning operation.

[0036] In this embodiment, an upper limit member 131 is provided at one end of the slide rail 13, and a lower limit member 132 is provided at the other end. A scraper 4 is provided in the filter tank 1 to slide along the slide rail 13. The upper limit member and the lower limit member are used to limit the sliding range of the scraper 4. The position of the upper limit member corresponds to the top of the filter cloth sleeve. Specifically, the height of the upper limit member is set higher than the top of the filter cloth sleeve, so that the scraper 4 can slide along the slide rail 13 to a position higher than the top of the filter cloth sleeve. The position of the lower limit member corresponds to the bottom of the filter cloth sleeve. Specifically, the height of the lower limit member is set lower than the bottom of the filter cloth sleeve, so that the scraper 4 can slide along the slide rail 13 to a position lower than the bottom of the filter cloth sleeve.

[0037] The candle filter provided by the present invention is provided with a scraper 4, and the scraper 4 is provided with a plurality of scraper mechanisms 5, and the scraper mechanism 5 is provided with a plurality of scraper holes 52, and the scraper holes 52 correspond to the filter element tube 3 one by one. After the candle filter has been used for a long time, the thickness of the filter cake layer on the filter element tube 3 is too large, so as to affect the filtering efficiency of the candle filter. At this time, the first solenoid valve 121, the second solenoid valve 211 and the third solenoid valve 141 are controlled to close the first liquid inlet 12 and the raw liquid tank 8, so that the first liquid inlet 12 is connected with the waste liquid tank 9, and the second liquid inlet 21 is connected with the raw liquid tank 8. The raw liquid enters the filter tank 1 from the second liquid inlet 21, and the raw liquid pushes the scraper 4 to move downward, and the scraper mechanism 5 A portion of the filter cake layer outside the filter element tube 3 is scraped off so that the filter cake layer outside the filter element tube 3 is at a thickness suitable for filtration. At this time, the first solenoid valve 121, the second solenoid valve 211 and the third solenoid valve 141 are controlled to close the second liquid inlet 21 and the raw liquid tank 8, connect the second liquid inlet 21 with the waste liquid tank 9, close the connection between the first liquid inlet 12 and the raw liquid tank 8, and the raw liquid enters the filter tank 1 from the first liquid inlet 12. The raw liquid pushes the scraper 4 to move upward and return to its original position. The filter element tube 3 continues to filter the raw liquid, so that the filter element tube 3 maintains a filter cake layer of appropriate thickness for filtration. After cleaning the filter cake layer, there is no need for filter cake accumulation for a certain period of time, thereby improving the filtration efficiency and filtration quality.

[0038] During use of this embodiment, after the candle filter is started, the electric control box first sends a signal to the first solenoid valve 121 and the second solenoid valve 211, so that the first liquid inlet pipe is connected to the filter tank 1, the second liquid inlet pipe and the filter tank 1 are closed, the raw liquid enters the filter tank 1 from the first liquid inlet port 12, and a filter cake layer begins to form outside the filter element tube 3. When the filter cake layer reaches a certain thickness, the electric control box sends a signal to the first solenoid valve 121 and the second solenoid valve 211, so that the first liquid inlet pipe and the filter tank 1 are connected, the second liquid inlet pipe and the filter tank 1 are closed, the raw liquid enters the filter tank 1 from the second liquid inlet port 21, and the scraper plate begins to move downward along the flow direction of the raw liquid, and the outer wall of the filter cake layer is scraped off in the process. Then, the electric control box sends a signal to the first solenoid valve 121 and the second solenoid valve 211, so that the first liquid inlet pipe and the filter tank 1 are connected, the second liquid inlet pipe and the filter tank 1 are closed, the raw liquid enters the filter tank 1 from the first liquid inlet port 12, the scraper plate begins to move upward along the flow direction of the raw liquid, and the scraper plate is reset to complete the scraping operation.

[0039] The candle filter provided by the present invention is provided with a scraper assembly 6, which can scrape off the outer wall of the filter cake layer during the filtering process so that the filter cake layer is always within the optimal filtering effect range, thereby improving the filtering effect and the filtering efficiency.

[0040] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A candle filter, comprising a filter tank, wherein the top of the filter tank is provided with an upper end cover, the bottom of the filter tank is provided with a material drop port, a plurality of filter core tubes are provided in the filter tank, a filter cloth sleeve is provided outside the filter core tube, a plurality of liquid collecting pipes are fixedly provided in the filter tank, and the plurality of filter core tubes are correspondingly connected to the liquid collecting pipes, characterized in that: The inner wall of the filter tank is provided with a plurality of slide rails, the extension direction of the slide rails is parallel to the axial direction of the filter tank, and a scraper is provided inside the filter tank to slide along the slide rails; The scraper is provided with a plurality of scraper mechanisms, and the scraper mechanisms are provided with a plurality of scraper holes, the scraper holes correspond to the filter tubes one by one, the aperture of the scraper holes is larger than the outer diameter of the filter tube, and the filter tube passes through the scraper holes; A first liquid inlet is provided at the bottom of the filter tank, and a second liquid inlet is provided on the upper end cover. The first liquid inlet is connected to the raw liquid tank and the waste liquid tank through a pipeline provided with a first solenoid valve, and the second liquid inlet is connected to the raw liquid tank and the waste liquid tank through a pipeline provided with a second solenoid valve.

2. A candle filter according to claim 1, characterized in that: The scraper mechanism includes a scraper shell fixedly connected to the scraper, the scraper shell is provided with a plurality of scraper holes, the scraper holes penetrate the scraper shell, at least one scraper assembly mounting groove is provided in the scraper shell, and a scraper assembly is slidably provided in the scraper assembly mounting groove.

3. A candle filter according to claim 2, characterized in that: The scraper assembly includes a first scraper mounting plate and a second scraper mounting plate slidably connected to the scraper assembly mounting groove, the first scraper mounting plate is provided with a first scraper mounting groove, the second scraper mounting plate is provided with a second scraper mounting groove, a first scraper is arranged in the first scraper mounting groove and the second scraper mounting groove, one end of the first scraper mounting plate is fixedly connected to a first rack, one end of the second scraper mounting plate is fixedly connected to a second rack, and the first rack and the second rack are arranged opposite to each other; At least one adjusting rod is rotatably provided in the scraper shell, the top end of the adjusting rod passes through the top of the scraper shell and extends out of the scraper shell, an adjusting knob is fixedly provided on the top end of the adjusting rod, a gear is fixedly provided on the adjusting rod, and the gear is meshed with the first rack and the second rack.

4. A candle filter according to claim 3, characterized in that: The cross sections of the first scraper installation groove and the second scraper installation groove are both semicircular, and the first scraper is in a semicircular ring shape; The inner wall of the scraper hole is fixedly connected with a second scraper, and the second scraper is in a circular ring shape.

5. A candle filter according to claim 3, characterized in that: A plurality of latching grooves are arranged at the bottom of the adjusting knob, and at least one group of latching members are arranged at the top of the scraper shell, and the latching members are latched with the latching grooves.

6. A candle filter according to claim 5, characterized in that: The locking member comprises a locking spring and a locking bead, one end of the locking spring is fixedly connected to the top of the scraper shell, and the other end is fixedly connected to the locking bead, and the locking bead is slidably connected to the locking groove.

7. A candle filter according to any one of claims 1 to 6, characterized in that: The upper end cover is provided with a back-blowing air inlet, and a third solenoid valve is provided on each of the plurality of liquid collecting pipes, and the liquid collecting pipes are connected to the liquid collecting tank and the back-blowing air inlet; The first solenoid valve, the second solenoid valve and the third solenoid valve are connected to an electric control box.

8. A candle filter according to claim 7, characterized in that: The upper end cover is provided with a filter tank pressure sensor, the liquid collecting tank is connected to the liquid collecting pipe via a liquid outlet pipe, the liquid outlet pipe is provided with a liquid outlet pressure sensor, the first liquid inlet is connected to the raw liquid tank via a first liquid inlet pipe, the second liquid inlet is connected to the raw liquid tank via a second liquid inlet pipe, and the first liquid inlet pipe and the second liquid inlet pipe are both provided with a liquid inlet pressure sensor; The filter tank pressure sensor, the liquid outlet pressure sensor and the liquid inlet pressure sensor are all connected to the electric control box with electrical signals.

9. A candle filter according to claim 8, characterized in that: The upper end cover is provided with a cleaning pipe, one end of which extends into the filter tank, and the other end is connected to a positive air inlet pipe and a cleaning water inlet pipe through a cleaning valve. The end of the cleaning pipe extending into the filter tank is provided with a nozzle, and the nozzle is provided with a plurality of openings.

10. The candle filter according to claim 1, characterized in that: An upper limit piece is provided at one end of the slide rail, and a lower limit piece is provided at the other end. A scraper is provided in the filter tank and slides along the slide rail. The upper limit piece and the lower limit piece are used to limit the sliding range of the scraper. The position of the upper limit piece corresponds to the top end of the filter cloth sleeve, and the position of the lower limit piece corresponds to the bottom end of the filter cloth sleeve.

Images