A three-stage filter for photosensitive resin

Abstract

The utility model relates to 3D printing technical field especially relates to a three -grade filter for photosensitive resin. The device includes filter jar, connecting pipeline and pressure pump, the filter jar contains first filter jar, second filter jar and third filter jar, each jar body top is equipped with feed pipe, bottom is equipped with discharge pipe, is equipped with filter screen inside, connecting pipeline is connected in proper order through detachable connection and is in series with the feed pipe and discharge pipe of three filter jars, the pressure pump is connected with the feed pipe of first filter jar, is used for conveying compressed gas drive resin flow. The filter passes through three -grade series connection filtration and promotes photosensitive resin purification precision, and detachable connection is convenient for maintenance and combination, and gas pressurization mode improves filtration efficiency, is applicable to 3D printing field resin processing.

Description

Technical Field

[0001] This utility model relates to the field of 3D printing technology, and in particular to a three-stage filter for photosensitive resin. Background Technology

[0002] In the field of 3D printing, photosensitive resin has become an important printing material due to its high-precision molding characteristics. However, during storage, transportation, and use, it is prone to problems such as environmental impurities and resin aging leading to particle precipitation, which can cause nozzle clogging and surface defects in the model, seriously affecting print quality and equipment lifespan. Therefore, effective filtration of photosensitive resin is a key step in ensuring the stability of the 3D printing process.

[0003] Existing filtration equipment for photosensitive resins has significant limitations. Single-stage filtration devices can only remove large particulate impurities and cannot filter out suspended particles in the resin, thus failing to meet the resin requirements of high-precision printing. Traditional multi-stage filtration equipment is mostly a fixed integrated structure, and the filter units cannot be separated. When only a small amount of resin filtration is needed or a certain stage of filter material fails, the entire equipment must be started or the entire set of filter components must be replaced.

[0004] Meanwhile, photosensitive resin has the characteristics of high viscosity and easy curing. The complex connection structure of traditional filtration equipment can easily lead to resin residue clogging the pipeline, and the disassembly and cleaning process is cumbersome, increasing maintenance costs. In addition, different models of 3D printers have different requirements for resin filtration accuracy, and integrated equipment with fixed filtration accuracy is difficult to flexibly adapt to diverse printing scenarios.

[0005] To address the aforementioned issues, those skilled in the art urgently require a filtration device that can flexibly switch between single-stage and multi-stage filtration modes, is easy to connect, and is compatible with the characteristics of photosensitive resins. Utility Model Content

[0006] To overcome the shortcomings of the prior art, this utility model provides a three-stage filter for photosensitive resin, including a filter tank, connecting pipes and a pressure pump;

[0007] The filter tank includes a first filter tank, a second filter tank, and a third filter tank. Each tank is equipped with an inlet pipe at the top, an outlet pipe at the bottom, and a filter screen inside. The connecting pipes are connected in series with the inlet and outlet pipes of the three filter tanks via a detachable connection. The pressure pump is connected to the inlet pipe of the first filter tank and is used to deliver compressed gas into the filter tank.

[0008] Based on the above solution, the connecting pipe is further detachably connected to the feed pipe and discharge pipe of the filter tank via a quick-connect fitting;

[0009] The connecting pipe is modularly assembled from a straight pipe section and two bends. The bends have a 90° bend structure and are connected to the filter tank interface at both ends via quick-connect couplings. The straight pipe section is connected to the bends at both ends via threaded unions.

[0010] Alternatively, the connecting pipe may consist of two elbows with an angle greater than or equal to 90° and less than or equal to 170° connected by a quick-connect fitting.

[0011] Based on the above solution, a discharge valve is further provided at the discharge pipe. The discharge valve is detachably connected to the discharge pipe. When the discharge valve is detached, it can be connected to a connecting pipe at the discharge pipe, and the connecting pipe is connected to the filter tank. When the discharge valve is installed, it can be used as a discharge port.

[0012] Based on the above scheme, each filter canister is further provided with a cover, and each cover is provided with a pressure gauge to monitor the pressure inside the filter canister.

[0013] Based on the above scheme, further, each filter tank is provided with a diversion branch pipe at its discharge pipe, and the diversion branch pipe is equipped with a regulating valve; the diameter of the diversion branch pipe is smaller than the diameter of the discharge pipe.

[0014] Based on the above scheme, the filter screen is made of stainless steel; the feed pipe of the filter tank is located above the filter screen, and the discharge pipe is located below the filter screen.

[0015] Based on the above scheme, the mesh size of the filter screen increases sequentially along the material filtration direction.

[0016] Based on the above solution, it further includes a mobile trolley, wherein the filter tank is detachably fixed to the carrying platform of the mobile trolley, and the bottom of the mobile trolley is equipped with casters with locking function.

[0017] Based on the above solution, the filter tank is further detachably fixed to the support platform via a connector;

[0018] The connector includes a first connecting part and a second connecting part that are perpendicular to each other. The first connecting part is fixedly connected to the side wall of the filter tank, and the second connecting part has a screw hole that matches the screw. The filter tank is fixed on the support platform by passing the screw through the screw hole.

[0019] Based on the above scheme, the quick-connect connector further includes two semi-annular clips, one end of which is connected by a hinge and the other end is detachably connected by a bolt assembly. A sealing gasket is provided on the inner side of the quick-connect connector.

[0020] Compared with existing technologies, the three-stage filter for photosensitive resin provided by this utility model uses three filter tanks connected in series to achieve step-by-step filtration of photosensitive resin through multi-layer filter screens. The detachable connecting pipes allow for flexible disassembly and combination of the three filter tanks, facilitating individual cleaning, maintenance, or filter screen replacement for each tank, and enabling flexible adjustment of usage according to actual filtration needs. Compressed gas is supplied to the feed pipe of the first filter tank via a pressure pump, using gas pressure to drive the resin flow within and between the filter tanks, accelerating the filtration speed. The overall structural design is reasonable, balancing filtration effect, ease of operation, and safety, and can well meet the professional needs of photosensitive resin purification in the 3D printing field. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the photosensitive resin three-stage filter provided by this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the photosensitive resin three-stage filter provided by this utility model;

[0024] Figure 3 This is a schematic diagram of the structure of Embodiment 3 of the photosensitive resin three-stage filter provided by this utility model;

[0025] Figure 4 A top view of the filter assembly provided by this utility model.

[0026] Figure 5 This is a partial structural diagram of the filter assembly provided by this utility model.

[0027] Figure label:

[0028] 10 First filter tank, 11 Connecting pipe, 12 Pressure pump, 13 Feed pipe, 14 Quick connector, 15 Cover, 16 Pressure gauge, 17 Branch pipe, 18 Regulating valve.

[0029] 20 Second filter tank, 21 Connector, 22 First connecting part, 23 Second connecting part,

[0030] 30 Third filter tank, 31 Discharge pipe, 32 Discharge valve, 33 Pressure regulating valve, 34 Moving trolley,

[0031] 40 Guide protrusion, 41 Horizontal protrusion, 42 Vertical protrusion, 43 Pressure cap, 44 Clamping rod. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] To provide a filtration device that can flexibly switch between single-stage / multi-stage filtration modes, is easy to connect, and is adapted to the characteristics of photosensitive resin, this utility model provides such a device. Figure 1-3 The photosensitive resin shown is used with a three-stage filter.

[0035] like Figure 1 As shown, the device includes a filter tank, a connecting pipe 11, and a pressure pump 12;

[0036] The filter tanks include a first filter tank 10, a second filter tank 20, and a third filter tank 30. Each tank is provided with an inlet pipe 13 at the top, an outlet pipe 31 at the bottom, and a filter screen inside. The connecting pipe 11 connects the inlet pipes 13 and outlet pipes 31 of the three filter tanks in a detachable connection manner. The pressure pump 12 is connected to the inlet pipe 13 of the first filter tank 10 and is used to deliver compressed gas into the filter tank.

[0037] Specifically, in use, the first filter tank 10, the second filter tank 20, and the third filter tank 30 are first connected in series in a detachable manner via connecting pipe 11, so that the discharge pipe 31 of the first filter tank is connected to the inlet pipe 13 of the second filter tank through connecting pipe 11, forming a three-stage filtration path; then, the output end of the pressure pump 12 is connected to the inlet pipe 13 of the first filter tank 10, and the input end of the pressure pump 12 is connected to the tank containing the photosensitive resin to be filtered; then, the pressure pump 12 is started, so that the photosensitive resin to be filtered enters the inlet pipe 13 of the first filter tank 10 after being pressurized by the pressure pump 12, flows out from the discharge pipe 31 after being filtered by the filter screen, and flows into the second filter tank 20 and the third filter tank 30 in sequence through connecting pipe 11, and is discharged from the discharge pipe 31 of the third filter tank 30, thus obtaining the filtered photosensitive resin.

[0038] Furthermore, such as Figure 1 As shown, the pressure pump 12 also includes a pressure regulating valve 33. The input end of the pressure regulating valve 33 is connected to the pressure pump 12, and the output end is connected to the filter tank through a hose. The pressure regulating valve 33 is located at one end of the discharge pipe 31 of the third filter tank 30 and is used to adjust the pressure inside the filter tank according to the resin flow rate at the outlet of the filter tank.

[0039] Optional, such as Figure 4 and Figure 5 As shown, the filter tank is equipped with a filter assembly. When a filter bag needs to be placed on top of the filter screen, the filter assembly is used to fix the filter bag. The filter assembly includes a cap 43 and guide protrusions 40. There are three guide protrusions 40, which are arranged circumferentially on the inner wall of the resin filter container 10. The guide protrusions 40 include horizontally extending transverse protrusions 41 and vertical protrusions 42 perpendicular to the transverse protrusions 41. The edge of the cap 43 extends with locking rods 44 that match the number of guide protrusions 40. The locking rods 44 can slide radially along the transverse protrusions 41 and rotate to abut and lock against the baffle of the vertical protrusions 42.

[0040] In one embodiment, such as Figure 1 As shown, the connecting pipe 11 is detachably connected to the feed pipe 13 and the discharge pipe 31 of the filter tank via a quick-connect fitting 14;

[0041] The connecting pipe 11 is modularly assembled from a straight pipe section and two bend pipe sections. The bend pipe section has a 90° bend structure and its two ends are connected to the filter tank interface through quick-connect couplings 14. The two ends of the straight pipe section are connected to the bend pipe section through threaded unions.

[0042] Alternatively, the connecting pipe 11 may be composed of two elbows with an angle greater than or equal to 90° and less than or equal to 170° connected by a quick-connect fitting 14.

[0043] In the above scheme, the connecting pipe 11 is detachably connected to the feed pipe 13 and discharge pipe 31 of the filter tank through the quick-connect fitting 14. Combined with the modular assembly structure of straight pipe sections and 90° bend pipe sections, or the combination of two 90°-170° bends through the quick-connect fitting 14, it not only greatly improves the convenience of pipe assembly and disassembly, but also facilitates the rapid assembly, disassembly and maintenance of the equipment. Furthermore, it can adapt to diverse installation space and layout requirements through the flexible combination of different pipe sections.

[0044] Further preferred, such as Figure 1 As shown, the connecting pipe 11 consists of two 90° elbows and a straight pipe section connected by a quick-connect fitting 14.

[0045] In one embodiment, such as Figure 2 As shown, a discharge valve 32 is provided at the discharge pipe 31. The discharge valve 32 is detachably connected to the discharge pipe 31. When the discharge valve 32 is detached, it can be connected to the connecting pipe 11 at the discharge pipe 31. The connecting pipe 11 is connected to the filter tank. When the discharge valve 32 is installed, it can be used as a discharge port.

[0046] In the above scheme, the detachable discharge valve 32 installed at the discharge pipe 31 allows the filter tank to be used directly as a discharge port through flexible installation and disassembly operations. It can also be connected to the connecting pipe 11 after the valve is removed to achieve multi-stage series filtration, which significantly improves the functionality and operational flexibility of the equipment. It can meet the usage requirements of different filtration scenarios without additional adapter parts and simplifies the operation process.

[0047] Furthermore, the valve and the discharge pipe 31 are detachably connected by threaded connection, snap-fit, or flange connection, with threaded connection being the preferred connection method.

[0048] like Figure 2 As shown in Example 2, when the resin only requires two-stage filtration, the third filter tank 30 can be disassembled, and a discharge valve 32 can be installed at the discharge port of the second filter tank 20 to achieve two-stage filtration of the photosensitive resin.

[0049] Or such as Figure 3 As shown in Example 3, when the resin needs to be filtered in four stages, the discharge valve 32 of the third filter tank 30 can be removed, and a fourth filter tank can be connected to the discharge pipe 31 of the third filter tank 30 through a connecting pipe 11 to achieve finer filtration of the photosensitive resin.

[0050] In one embodiment, such as Figure 1 As shown, each filter canister is provided with a cover 15, and each cover 15 is provided with a pressure gauge 16 to monitor the pressure inside the filter canister.

[0051] In one embodiment, such as Figure 1 As shown, each filter tank has a branch pipe 17 at its discharge pipe 31, and a regulating valve 18 is provided on the branch pipe 17; the diameter of the branch pipe 17 is smaller than the diameter of the discharge pipe 31.

[0052] In the above scheme, a branch pipe 17 with a regulating valve 18 is added to the discharge pipe 31 of the filter tank. The diameter of the branch pipe 17 is smaller than that of the discharge pipe 31. When the resin receiving demand is small, the resin can be received through the branch pipe 17. When the resin receiving demand is large, the resin can be received through the discharge pipe 31. In addition, when the inside of the tank needs to be cleaned, the water can also be drained through the receiving pipe because the receiving pipe is thicker.

[0053] In one embodiment, the filter screen is made of stainless steel; the feed pipe 13 of the filter tank is located above the filter screen, and the discharge pipe 31 is located below the filter screen.

[0054] The filter screen of the above solution is made of stainless steel, which has good corrosion resistance, strength and wear resistance, can adapt to the chemical characteristics of photosensitive resin, extend the service life of the filter screen, and is easy to clean and reuse. The structural design of the feed pipe 13 being located above the filter screen and the discharge pipe 31 being located below the filter screen allows the resin to flow fully through the filter screen under the combined action of gravity and pressure, ensuring that impurities are effectively intercepted and improving the filtration effect.

[0055] In one embodiment, the mesh size of the filter increases sequentially along the material filtration direction.

[0056] For example, the filter screen inside the first filter tank 10 has a mesh size of 20, the filter screen inside the second filter tank 20 has a mesh size of 40, and the filter screen inside the third filter tank 30 has a mesh size of 60.

[0057] In one embodiment, such as Figure 1 As shown, it also includes a mobile trolley 34, the filter canister being detachably fixed to the support platform of the mobile trolley 34, and the bottom of the mobile trolley 34 is equipped with casters with locking function.

[0058] In one embodiment, such as Figure 1 As shown, the filter canister is detachably fixed to the support platform via connector 21.

[0059] The connector 21 includes a first connecting part 22 and a second connecting part 23 that are perpendicular to each other. The first connecting part 22 is fixedly connected to the side wall of the filter tank, and the second connecting part 23 has a screw hole that matches the screw. The filter tank is fixed on the support platform by passing the screw through the screw hole.

[0060] The above solution is equipped with a mobile trolley 34 with locking casters, and the filter canister can be detachably fixed on the support platform, which makes the equipment flexible and easy to adjust the placement position according to work needs. The locking function can ensure the stability of the equipment during operation. The detachable design of the filter canister makes it easy to remove it for cleaning, maintenance or replacement, which greatly improves the ease of use and site adaptability of the equipment.

[0061] In one embodiment, the quick-connect connector 14 includes two semi-annular clips, one end of which is connected by a hinge and the other end is detachably connected by a bolt assembly. A sealing gasket is provided on the inner side of the quick-connect connector 14.

[0062] Although this document frequently uses terms such as filter tank, connecting pipe, pressure pump, first filter tank, second filter tank, and third filter tank, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A three-stage filter for photosensitive resin, characterized in that: Includes a filter tank, connecting pipes (11) and a pressure pump (12); The filter tank includes a first filter tank (10), a second filter tank (20) and a third filter tank (30). Each tank is provided with an inlet pipe (13) at the top, an outlet pipe (31) at the bottom and a filter screen inside. The connecting pipe (11) is connected in series with the inlet pipe (13) and outlet pipe (31) of the three filter tanks in a detachable connection manner. The pressure pump (12) is connected to the inlet pipe (13) of the first filter tank (10) and is used to deliver compressed gas into the filter tank.

2. The three-stage filter for photosensitive resin according to claim 1, characterized in that: The connecting pipe (11) is detachably connected to the feed pipe (13) and discharge pipe (31) of the filter tank via a quick-connect fitting (14); The connecting pipe (11) is modularly assembled from a straight pipe section and two bend pipe sections. The bend pipe section has a 90° bend structure and is connected to the filter tank interface at both ends through quick-connect fittings (14). The straight pipe section is connected to the bend pipe section at both ends through threaded unions. Alternatively, the connecting pipe (11) may be composed of two elbows with a radius greater than or equal to 90° and less than or equal to 170° connected by a quick-connect fitting (14).

3. The three-stage filter for photosensitive resin according to claim 1, characterized in that: The discharge pipe (31) is provided with a discharge valve (32). The discharge valve (32) and the discharge pipe (31) are detachably connected. When the discharge valve (32) is disassembled, it can be connected to the connecting pipe (11) at the discharge pipe (31). The connecting pipe (11) is connected to the filter tank. When the discharge valve (32) is installed, it can be used as a discharge port.

4. The three-stage filter for photosensitive resin according to claim 1, characterized in that: Each filter canister is provided with a cover (15), and each cover (15) is provided with a pressure gauge (16) to monitor the pressure inside the filter canister.

5. The three-stage filter for photosensitive resin according to claim 1, characterized in that: Each filter tank is provided with a branch pipe (17) at the discharge pipe (31), and a regulating valve (18) is provided on the branch pipe (17); the diameter of the branch pipe (17) is smaller than the diameter of the discharge pipe (31).

6. The three-stage filter for photosensitive resin according to claim 1, characterized in that: The filter screen is made of stainless steel; the feed pipe (13) of the filter tank is located above the filter screen, and the discharge pipe (31) is located below the filter screen.

7. The three-stage filter for photosensitive resin according to claim 1, characterized in that: The mesh size of the filter increases sequentially along the material filtration direction.

8. The three-stage filter for photosensitive resin according to claim 1, characterized in that: It also includes a mobile trolley (34), the filter canister being detachably fixed to the carrying platform of the mobile trolley (34), and the bottom of the mobile trolley (34) is provided with casters with locking function.

9. The three-stage filter for photosensitive resin according to claim 1, characterized in that: The filter canister is detachably fixed to the support platform via connector (21); The connector (21) includes a first connecting part (22) and a second connecting part (23) that are perpendicular to each other. The first connecting part (22) is fixedly connected to the side wall of the filter tank, and the second connecting part (23) has a screw hole that is compatible with the screw. The filter tank is fixed on the support platform by passing the screw through the screw hole.

10. The three-stage filter for photosensitive resin according to claim 2, characterized in that: The quick-connector (14) includes two semi-annular clips, one end of which is connected by a hinge and the other end is detachably connected by a bolt assembly. The quick-connector (14) has a sealing gasket on its inner side.

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