Pre-filter

Abstract

The utility model belongs to the technical field of filters, and particularly relates to a pre-filter which comprises a filter bottle, a filter element and a pressing assembly, the filter element is arranged in the filter bottle; the pressing assembly comprises a pressing head and a locking mechanism, the pressing head is arranged at the top of the filter element and is exposed out of the filter bottle through a top opening, the locking mechanism is arranged in the filter bottle and is located at the bottom of the filter element, and the locking mechanism is configured in the mode that when the pressing head is continuously pressed twice, the pressing head is pressed for one time, the locking mechanism locks the filter element, and the pressing head is pressed for the other time; and the locking mechanism unlocks the filter element. When the filter element is replaced, a user can lock and unlock the filter element only by pressing the pressing head, and the operation is simple and convenient and is not limited by space; the pressing head and the locking mechanism are respectively positioned at the top and the bottom of the filter element, so that a user can operate conveniently, the filter element can be taken out conveniently, and the structural layout is reasonable.

Description

Technical Field

[0001] This utility model relates to the field of filter technology, and in particular to a pre-filter. Background Technology

[0002] Pre-filters are generally used in water purification systems and are placed upstream of the reverse osmosis filter cartridge. Pre-filters can filter out large particulate impurities in the raw water, preventing them from entering downstream valves and pumps and causing wear. They also help improve the filtration efficiency of the reverse osmosis filter cartridge.

[0003] Currently, there are two solutions for quick filter replacement in pre-filters: threaded connection and rotary snap-fit ​​connection. The problems with both threaded and rotary snap-fit ​​connections are: cumbersome operation steps, inconvenient operation, and difficulty in applying sufficient torque to replace the filter element in low, confined spaces. Utility Model Content

[0004] The purpose of this utility model is to provide a pre-filter that is simple and convenient to operate and is not limited by space; and the pressing head and locking mechanism are located at the top and bottom of the filter element respectively, which not only makes it convenient for users to operate, but also makes it easy to remove the filter element, with a reasonable structural layout.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] The pre-filter includes:

[0007] Filter bottle with an open top;

[0008] The filter element is disposed inside the filter bottle;

[0009] The pressing assembly includes a pressing head and a locking mechanism. The pressing head is disposed on the top of the filter element and exposed to the filter bottle through the top opening. The locking mechanism is disposed inside the filter bottle and located at the bottom of the filter element. The locking mechanism is configured such that when the pressing head is pressed twice consecutively, the locking mechanism locks the filter element on the first press and unlocks the filter element on the second press.

[0010] Preferably, a fixing seat is provided inside the filter bottle, and a sealing ring is provided between the pressing head and the fixing seat.

[0011] Preferably, the pressing head has a flange that can abut against the fixed base to limit the downward stroke of the pressing head.

[0012] Preferably, the flange is located at one end of the pressing head that is exposed on the filter bottle, the flange is annular, and the outer diameter of the flange is equal to the inner diameter of the top opening.

[0013] Preferably, the outer peripheral wall of the filter element is provided with a snap-fit ​​protrusion, and the locking mechanism includes a locking component and multiple claws. When the pressing head is pressed, the locking component can make the multiple claws move closer or further apart from each other to snap or separate from the snap-fit ​​protrusion.

[0014] Preferably, the locking assembly includes:

[0015] A fixing member is fixedly installed inside the filter bottle. The inner wall of the fixing member is provided with multiple locking grooves and multiple unlocking channels. The multiple locking grooves and multiple unlocking channels are evenly distributed along the circumference of the fixing member, and the multiple locking grooves and multiple unlocking channels are intersected. Along the first circumferential direction, a first guide part is provided between the unlocking channel and the adjacent locking groove, and a second guide part is provided between the locking groove and the adjacent unlocking channel.

[0016] A first movable component is disposed inside the fixed component. The axis of the first movable component is a first axis. The first movable component can move relative to the fixed component along the first axis in a first direction under the drive of the filter element. A plurality of first driving parts are disposed at the lower end of the first movable component. The plurality of first driving parts are evenly distributed along the circumference of the first movable component.

[0017] The second moving part is disposed inside the first moving part, and a plurality of the claws are disposed on the second moving part. The second moving part is also provided with a plurality of second driving parts. The plurality of claws and the plurality of second driving parts are evenly distributed along the circumference of the second moving part. The plurality of second driving parts can enter the plurality of locking slots or the plurality of unlocking channels one by one.

[0018] An elastic element is disposed at the lower end of the second moving element. Under the action of the elastic force of the elastic element, the second moving element can move along the first axis to the second direction. The second moving element is driven to move and reset along the first axis to the second direction through the cooperation of the second driving part and the first driving part. The second driving part is also rotated by a set angle around the first axis in the first rotation direction through the cooperation of the second driving part and the first guide part or the second guide part, so that the second driving part enters the locking groove or the unlocking channel.

[0019] The first direction is opposite to the second direction; the first circumferential direction is the same as the first rotational direction.

[0020] Preferably, the first driving part, the second driving part, the first guide part, and the second guide part are all serrated, and the cross-sectional shape of the first driving part is an isosceles triangle, while the cross-sectional shapes of the second driving part, the first guide part, and the second guide part are all right triangles.

[0021] When the pressing head is not pressed, the inclined surface of the second driving part is parallel to the waist surface of the first driving part, and the tooth tip of the second driving part is directly opposite the middle of the waist surface of the first driving part; the straight surface of the second driving part is parallel to the straight surface of the first guide part and the second guide part, and the line connecting the tooth tip of the second driving part and the tooth tip of the first guide part or the tooth tip of the second guide part is basically parallel to the first axis.

[0022] Preferably, the outer peripheral wall of the first movable member is provided with a plurality of sliding protrusions, and the plurality of sliding protrusions correspond one-to-one with the plurality of unlocking channels and slide in cooperation.

[0023] Preferably, at least a portion of the plurality of unlocking channels are connected through each other, and the portion of the plurality of sliding protrusions corresponding to the connected unlocking channels extends along the first axis to the second direction to form an extension portion, the extension portion passing through the unlocking channel; the outer peripheral wall of the filter element is provided with a pressure plate, the pressure plate being able to act on the extension portion.

[0024] Preferably, some of the unlocking channels are not continuous.

[0025] The beneficial effects of this utility model are:

[0026] This utility model provides a pre-filter, including a filter bottle, a filter element, and a pressing assembly. The filter bottle has a top opening; the filter element is disposed inside the filter bottle; the pressing assembly includes a pressing head and a locking mechanism. The pressing head is disposed on the top of the filter element and protrudes from the filter bottle through the top opening. The locking mechanism is disposed inside the filter bottle and located at the bottom of the filter element. The locking mechanism is configured such that when the pressing head is pressed twice consecutively, the locking mechanism locks the filter element with one press and unlocks the filter element with another press. When replacing the filter element, the user only needs to press the pressing head to lock and unlock the filter element, which is simple and convenient to operate and not limited by space. Furthermore, the pressing head and locking mechanism are located at the top and bottom of the filter element, respectively, which not only facilitates user operation but also makes it easy to remove the filter element, resulting in a reasonable structural layout. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the pre-filter provided in an embodiment of the present invention;

[0028] Figure 2 This is a cross-sectional view of the pre-filter provided in an embodiment of this utility model;

[0029] Figure 3 This is a structural schematic diagram of the fastener involved in the embodiments of this utility model;

[0030] Figure 4This is a schematic diagram of the structure of the first moving part involved in the embodiment of this utility model;

[0031] Figure 5 This is a schematic diagram of the structure of the second moving member and the elastic member involved in the embodiments of this utility model;

[0032] Figure 6 This is a schematic diagram of the structure of the first moving member, the second moving member, and the elastic member involved in the embodiments of this utility model.

[0033] In the picture:

[0034] 10. Filter bottle; 11. Top opening; 20. Filter element; 21. Snap-fit ​​protrusion; 22. Pressure plate; 31. Press head; 311. Flange; 32. Locking mechanism; 321. Fixing component; 3211. Unlocking channel; 3212. Locking groove; 3213. First guide part; 3214. Second guide part; 322. First moving part; 3221. First driving part; 3222. Sliding protrusion; 3222a. Extension part; 323. Second moving part; 3231. Claw; 3232. Second driving part; 324. Elastic component; 40. Fixing seat; 50. Sealing ring. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0036] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0039] like Figures 1 to 6 As shown, this utility model embodiment provides a pre-filter, including a filter bottle 10, a filter element 20, and a pressing assembly. The filter bottle 10 has a top opening 11; the filter element 20 is disposed inside the filter bottle 10; the pressing assembly includes a pressing head 31 and a locking mechanism 32. The pressing head 31 is disposed on the top of the filter element 20 and is exposed outside the filter bottle 10 through the top opening 11. The locking mechanism 32 is disposed inside the filter bottle 10 and located at the bottom of the filter element 20. The locking mechanism 32 is configured such that when the pressing head 31 is pressed twice consecutively, the locking mechanism 32 locks the filter element 20 on the first press and unlocks the filter element 20 on the second press. When replacing the filter element 20, the user only needs to press the pressing head 31 to lock and unlock the filter element 20. The operation is simple and convenient and is not limited by space. Furthermore, the pressing head 31 and the locking mechanism 32 are located at the top and bottom of the filter element 20, which not only makes it convenient for the user to operate, but also makes it easy to remove the filter element 20. The structure layout is reasonable.

[0040] Furthermore, the outer peripheral wall of the filter element 20 is provided with a snap-fit ​​protrusion 21, and the locking mechanism 32 includes a locking component and multiple claws 3231. When the pressing head 31 is pressed, the locking component can cause the multiple claws 3231 to move closer or further apart to engage or disengage with the snap-fit ​​protrusion 21. Through the cooperation of the claws 3231 and the snap-fit ​​protrusion 21, the locking and unlocking of the locking mechanism 32 and the filter element 20 is further simplified.

[0041] Specifically, the locking assembly includes a fixing member 321, a first moving member 322, a second moving member 323, and an elastic member 324. The fixing member 321 is fixedly disposed inside the filter bottle 10. The axis of the fixing member 321 is the first axis. The inner wall of the fixing member 321 is provided with a plurality of locking grooves 3212 and a plurality of unlocking channels 3211. The plurality of locking grooves 3212 and the plurality of unlocking channels 3211 are evenly distributed along the circumference of the fixing member 321, and the plurality of locking grooves 3212 and the plurality of unlocking channels 3211 are intersectingly distributed around the first axis and along the first circumferential direction. A first guide portion 3213 is provided between the unlocking channel 3211 and the adjacent locking groove 3212, and a second guide portion 3214 is provided between the locking groove 3212 and the adjacent unlocking channel 3211. The unlocking channel 3211 extends along the first axis direction. The first moving member 322 is disposed inside the fixed member 321. The axis of the first moving member 322 is the first axis. The first moving member 322 can move along the first axis in the first direction under the drive of the filter element 20. The lower end of the first moving member 322 is provided with a plurality of first driving parts 3221, which are evenly distributed around the circumference of the first moving member 322. The second moving member 323 is disposed inside the first moving member 322. A plurality of claws 3231 are disposed on the second moving member 323. The second moving member 323 is also provided with a plurality of second driving parts 3232. The claws 3231 and the second driving parts 3232 are evenly distributed around the circumference of the second moving member 323. The multiple second driving parts 3232 can enter the multiple locking slots 3212 or the multiple unlocking channels 3211 one by one. When the second drive unit 3232 is located in the locking groove 3212 or the unlocking channel 3211, the first moving member 322 can drive the second moving member 323 to move along the first axis in the first direction through the cooperation of the first drive unit 3221 and the second drive unit 3232. When the second drive unit 3232 disengages from the locking groove 3212 or the unlocking channel 3211, the first moving member 322 can drive the second moving member 323 to move along the first axis in the first direction through the cooperation of the first drive unit 3221 and the second drive unit 3232, and at the same time drive the second moving member 323 to rotate around the first axis in the first rotation direction by a set angle. The elastic element 324 is disposed at the lower end of the second moving element 323. Under the action of the elastic force of the elastic element 324, the second moving element 323 can move along the first axis to the second direction. Through the cooperation of the second driving part 3232 and the first driving part 3221, the first moving element 322 is driven to move and reset along the first axis to the second direction. Furthermore, through the cooperation of the second driving part 3232 and the first guide part 3213 or the second guide part 3214, the second driving part 3232 rotates around the first axis in the first rotation direction by a set angle, causing the second driving part 3232 to enter the locking groove 3212 or the unlocking channel 3211. The first direction is opposite to the second direction. The first circumferential direction is the same as the first rotation direction.

[0042] When installing the filter element 20, the second drive part 3232 of the second moving part 323 is located in the unlocking channel 3211. First, connect the pressing head 31 to the top of the filter element 20, and then insert the filter element 20 into the filter bottle 10 through the top opening 11. After the filter element 20 contacts the first moving part 322, press the pressing head 31. Under the action of the pressing force, the filter element 20 moves the first moving part 322 along the first axis in the first direction. The first moving part 322 drives the second moving part 323 to move along the first axis in the first direction through the cooperation of the first drive part 3221 and the second drive part 3232. After the second drive part 3232 disengages from the unlocking channel 3211, the first moving part 322 drives the second moving part 323 to continue moving in the first direction through the cooperation of the first drive part 3221 and the second drive part 3232, while simultaneously driving the second moving part... When the second moving part 323 rotates around the first axis in the first rotation direction, multiple claws 3231 enter the fixing member 321. Under the compression of the fixing member 321, the multiple claws 3231 approach each other and engage with the filter element 20. At the same time, when the second moving part 323 moves along the first axis in the first direction, it compresses the elastic member 324. After the pressing head 31 is released, under the action of the elastic member 324, the second moving part 323 moves along the first axis in the second direction. The second moving part 323 drives the first moving part 322 to move and reset along the first axis in the second direction through the cooperation of the second driving part 3232 and the first driving part 3221. Then, the second driving part 3232 cooperates with the first guide part 3213 to make the second moving part 323 rotate around the first axis by a set angle and then engage in the locking groove 3212. The second moving part 323 can no longer move, so the filter element 20 is locked.

[0043] When the filter element 20 is disassembled, the second driving part 3232 of the second moving part 323 is located in the locking groove 3212. First, press the pressing head 31. Under the action of the pressing force, the filter element 20 moves the first moving part 322 along the first axis in the first direction. The first moving part 322 drives the second moving part 323 to move along the first axis in the first direction through the cooperation of the first driving part 3221 and the second driving part 3232. After the second driving part 3232 disengages from the locking groove 3212, the first moving part 322 drives the second moving part 323 to continue moving in the first direction through the cooperation of the first driving part 3221 and the second driving part 3232. At the same time, it drives the second moving part 323 to rotate around the first axis in the first rotation direction. At this time, the elastic member 324 is compressed. Release the pressing head 31. After step 1, under the restoring force of the elastic element 324, the second moving element 323 moves along the first axis to the second direction. The second moving element 323 drives the first moving element 322 to move and reset along the first axis to the second direction through the cooperation of the second driving part 3232 and the first driving part 3221. Then, the second driving part 3232 cooperates with the second guide part 3214 to make the second moving element 323 rotate around the first axis by a set angle and enter the unlocking channel 3211. The second moving element 323 continues to move along the first axis to the second direction in the unlocking channel 3211 until the restoring force of the elastic element 324 is released. At this time, multiple claws 3231 extend from the fixing part 321. Under the action of the restoring force, the multiple claws 3231 move away from each other to separate from the filter element 20, thereby unlocking the filter element 20.

[0044] It should be noted that the claws 3231 are elastic. When not under force (i.e., extending beyond the fixing member 321), the claws 3231 are in a state of separation from each other, and in this state, the claws 3231 are separated from the filter element 20. When under force (i.e., retracted into the fixing member 321), the claws 3231 are in a state of close proximity to each other, and in this state, the claws 3231 are engaged with the filter element 20. In this embodiment, the filter element 20 is provided with a locking protrusion 21, and the claws 3231 can engage or disengage with the locking protrusion 21.

[0045] In this embodiment, the first driving part 3221 is serrated, and its cross-sectional shape is an isosceles triangle; the second driving part 3232 is serrated, and its cross-sectional shape is a right triangle. The first guide part 3213 is serrated, and its cross-section is a right triangle; the second guide part 3214 is serrated, and its cross-section is a right triangle. The number of second driving parts 3232, locking grooves 3212, and unlocking channels 3211 is the same, and the number of first driving parts 3221 is twice the number of second driving parts 3232.

[0046] When the pressing head 31 is not pressed, the inclined surface of the second driving part 3232 is parallel to the waist surface of the first driving part 3221, and the tooth tip of the second driving part 3232 is directly opposite the middle of the waist surface of the first driving part 3221; in addition, the straight surface of the second driving part 3232 is parallel to the straight surface of the first guide part 3213 and the second guide part 3214, and the line connecting the tooth tip of the second driving part 3232 with the tooth tip of the first guide part 3213 or the tooth tip of the second guide part 3214 is basically parallel to the first axis.

[0047] It is understood that the shapes of the first driving part 3221, the second driving part 3232, the first guide part 3213 and the second guide part 3214 are not limited to this embodiment, and any shape that can realize the above driving relationship is acceptable.

[0048] When the filter element 20 is in the unlocked state, that is, when the second drive part 3232 is located in the unlocking channel 3211, the right angle surface of the second drive part 3232 is in contact with the first guide part 3213 and the tooth tips are opposite each other, and the rotation of the second moving part 323 is restricted by the unlocking channel 3211. When the first moving member 322 moves along the first axis in the first direction, the first driving part 3221 drives the second moving member 323 to move along the first axis in the first direction by pushing the second driving part 3232. When the second driving part 3232 moves to disengage from the unlocking channel 3211, the rotation restriction of the second moving member 323 is released. At this time, the first moving member 322 will continue to push the second moving member 323. Since the tooth tip of the second driving part 3232 is located in the middle of the waist surface of the first driving part 3221, the second driving part 3232 will move along the waist surface of the first driving part 3221 until its tooth tip abuts against the tooth root of the first driving part 3221. During this process, the second moving member 323 rotates at a certain angle. At this time, the tooth tip of the second driving part 3232 is misaligned with the tooth tip of the first guide part 3213, and the tooth tip of the second driving part 3232 is opposite to the inclined surface of the first guide part 3213. When the second moving member 323 moves along the first axis to the second direction under the rebound force of the elastic member 324, the second driving part 3232 will push against the first driving part 3221 to move the first moving member 322 back to its original position along the first axis to the second direction. After the first moving member 322 moves back to its original position, the tooth tip and the inclined surface of the second driving part 3232 just come into contact with the inclined surface of the first guide part 3213. The second driving part 3232 will rotate at a certain angle under the guidance of the inclined surface of the first guide part 3213 and lock into the locking groove 3212.

[0049] When the filter element 20 is in the locked state, that is, when the second drive part 3232 is located in the locking groove 3212, the right angle surface of the second drive part 3232 and the tooth tip are in contact, and the rotation of the second moving part 323 is restricted by the locking groove 3212. When the first moving member 322 moves along the first axis in the first direction, the first driving part 3221 drives the second moving member 323 to move along the first axis in the first direction by pushing the second driving part 3232. When the second driving part 3232 moves to disengage from the locking groove 3212, the rotation restriction of the second moving member 323 is released. At this time, the first moving member 322 will continue to push the second moving member 323. Since the tooth tip of the second driving part 3232 is located in the middle of the waist surface of the first driving part 3221, the second driving part 3232 will move along the waist surface of the first driving part 3221 until its tooth tip abuts against the tooth root of the first driving part 3221. During this process, the second moving member 323 rotates at a certain angle. At this time, the tooth tip of the second driving part 3232 is misaligned with the tooth tip of the second guide part 3214, and the tooth tip of the second driving part 3232 is opposite to the inclined surface of the second guide part 3214. When the second moving member 323 moves along the first axis to the second direction under the action of the elastic member 324, the second driving part 3232 will push against the first driving part 3221 to make the first moving member 322 move along the first axis to the second direction and reset. After the first moving member 322 moves to the reset, the tooth tip and the inclined surface of the second driving part 3232 just come into contact with the inclined surface of the second guide part 3214. The second driving part 3232 will rotate at a certain angle under the guidance of the inclined surface of the second guide part 3214 and enter the unlocking channel 3211.

[0050] In this embodiment, a plurality of sliding protrusions 3222 are provided on the outer peripheral wall of the first moving member 322. The plurality of sliding protrusions 3222 correspond one-to-one with a plurality of unlocking channels 3211 and are slidably engaged. The first moving member 322 moves only along the first axis under the sliding engagement of the sliding protrusions 3222 and the unlocking channels 3211. Furthermore, by sliding the sliding protrusions 3222 and the unlocking channels 3211, the need for a separate slide rail is eliminated, resulting in a simpler and more compact structure.

[0051] In this embodiment, at least a portion of the plurality of unlocking channels 3211 are connected through each other. A portion of the plurality of sliding protrusions 3222 corresponding to the connected unlocking channels 3211 extends along the first axis in the second direction to form an extension 3222a, which protrudes through the unlocking channel 3211. A pressure plate 22 is provided on the outer peripheral wall of the filter element 20, and the pressure plate 22 can act on the extension 3222a. When the filter element 20 moves along the first axis in the first direction under pressure, the pressure plate 22 can act on the extension 3222a, causing the first moving member 322 to move along the first axis in the first direction along with the filter element 20.

[0052] In this embodiment, some of the multiple unlocking channels 3211 are not through-through. When the sliding protrusion 3222 slides to the closed end of the non-through unlocking channel 3211, it is blocked and stops sliding. That is, by making some of the multiple unlocking channels 3211 non-through-through, the movement of the first moving member 322 can be limited, eliminating the need for a separate limiting structure and simplifying the structure.

[0053] In this embodiment, a fixing seat 40 is provided inside the filter bottle 10, and a sealing ring 50 is provided between the pressing head 31 and the fixing seat 40. By providing the sealing ring 50, the damping of the pressing head 31 can be increased, so that the pressing head 31 will not suddenly pop out when it is reset after being pressed.

[0054] In this embodiment, the pressing head 31 has a flange 311, which can abut against the fixing seat 40 to limit the downward stroke of the pressing head 31. Optionally, the flange 311 is annular, and the outer diameter of the flange 311 is equal to the inner diameter of the top opening 11 of the filter bottle 10, so that the pressing head 31 can both move downward through the top opening 11 of the filter bottle 10 when pressed and cover the top opening 11 of the filter bottle 10 when not pressed.

[0055] The structure of the locking assembly is not unique. In other embodiments, the locking assembly may also include a positioning rod and a retaining seat. The positioning rod is provided with an inclined surface that cooperates with the claw. The rod can be pressed down by the filter element. When the rod is pressed down, it can drive the claw to move through the inclined surface, so that the claw switches between an unlocked state and a locked state. When the rod is pressed down, it can extend into the retaining seat. The retaining seat is provided with a channel, and a component can be set in the channel. The shape of the channel and the shape of the component are set to lock the positioning rod in the unlocked position or the locked position.

[0056] The above examples illustrate two structural forms of the locking assembly, but are not intended to limit the application of these forms.

[0057] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A pre-filter, characterized in that, include: Filter bottle (10) with an open top (11); A filter element (20) is disposed inside the filter bottle (10); The pressing assembly includes a pressing head (31) and a locking mechanism (32). The pressing head (31) is disposed on the top of the filter element (20) and exposed to the filter bottle (10) through the top opening (11). The locking mechanism (32) is disposed inside the filter bottle (10) and located at the bottom of the filter element (20). The locking mechanism (32) is configured such that when the pressing head (31) is pressed twice consecutively, the locking mechanism (32) locks the filter element (20) on one press and unlocks the filter element (20) on the other press.

2. The pre-filter according to claim 1, characterized in that, A fixing seat (40) is provided inside the filter bottle (10), and a sealing ring (50) is provided between the pressing head (31) and the fixing seat (40).

3. The pre-filter according to claim 2, characterized in that, The pressing head (31) has a flange (311) that can abut against the fixed seat (40) to limit the downward stroke of the pressing head (31).

4. The pre-filter according to claim 3, characterized in that, The flange (311) is located at one end of the pressing head (31) exposed on the filter bottle (10). The flange (311) is annular, and the outer diameter of the flange (311) is equal to the inner diameter of the top opening (11).

5. The pre-filter according to any one of claims 1-4, characterized in that, The outer peripheral wall of the filter element (20) is provided with a snap-fit ​​protrusion (21). The locking mechanism (32) includes a locking component and multiple claws (3231). When the pressing head (31) is pressed, the locking component can make the multiple claws (3231) move closer or further away from each other to snap or separate from the snap-fit ​​protrusion (21).

6. The pre-filter according to claim 5, characterized in that, The locking assembly includes: A fixing member (321) is fixedly disposed inside the filter bottle (10). The inner wall of the fixing member (321) is provided with a plurality of locking grooves (3212) and a plurality of unlocking channels (3211). The plurality of locking grooves (3212) and the plurality of unlocking channels (3211) are evenly distributed along the circumference of the fixing member (321), and the plurality of locking grooves (3212) and the plurality of unlocking channels (3211) are intersected. Along the first circumferential direction, a first guide portion (3213) is provided between the unlocking channel (3211) and the adjacent locking groove (3212), and a second guide portion (3214) is provided between the locking groove (3212) and the adjacent unlocking channel (3211). A first movable member (322) is disposed inside the fixed member (321). The axis of the first movable member (322) is a first axis. The first movable member (322) can move relative to the fixed member (321) along the first axis in a first direction under the drive of the filter element (20). A plurality of first driving parts (3221) are disposed at the lower end of the first movable member (322). The plurality of first driving parts (3221) are evenly distributed along the circumference of the first movable member (322). The second moving part (323) is disposed inside the first moving part (322). A plurality of the claws (3231) are disposed on the second moving part (323). A plurality of second driving parts (3232) are also disposed on the second moving part (323). The plurality of claws (3231) and the plurality of second driving parts (3232) are evenly distributed along the circumference of the second moving part (323). The plurality of second driving parts (3232) can enter the plurality of locking slots (3212) or the plurality of unlocking channels (3211) one by one. An elastic element (324) is disposed at the lower end of the second moving element (323). Under the action of the elastic force of the elastic element (324), the second moving element (323) can move along the first axis to the second direction. The first moving element (322) is driven to move and reset along the first axis to the second direction through the cooperation of the second driving part (3232) and the first driving part (3221). The second driving part (3232) is also rotated by a set angle around the first axis to the first rotation direction through the cooperation of the second driving part (3232) and the first guide part (3213) or the second guide part (3214). This causes the second driving part (3232) to enter the locking groove (3212) or the unlocking channel (3211). The first direction is opposite to the second direction; the first circumferential direction is the same as the first rotational direction.

7. The pre-filter according to claim 6, characterized in that, The first driving part (3221), the second driving part (3232), the first guide part (3213), and the second guide part (3214) are all serrated, and the cross-sectional shape of the first driving part (3221) is an isosceles triangle, while the cross-sectional shapes of the second driving part (3232), the first guide part (3213), and the second guide part (3214) are all right triangles. When the pressing head (31) is not pressed, the inclined surface of the second driving part (3232) is parallel to the waist surface of the first driving part (3221), and the tooth tip of the second driving part (3232) is directly opposite the middle of the waist surface of the first driving part (3221); the straight surface of the second driving part (3232) is parallel to the straight surface of the first guide part (3213) and the second guide part (3214), and the line connecting the tooth tip of the second driving part (3232) with the tooth tip of the first guide part (3213) or the tooth tip of the second guide part (3214) is basically parallel to the first axis.

8. The pre-filter according to claim 6, characterized in that, The outer peripheral wall of the first movable member (322) is provided with a plurality of sliding protrusions (3222), and the plurality of sliding protrusions (3222) correspond one-to-one with the plurality of unlocking channels (3211) and slide in cooperation.

9. The pre-filter according to claim 8, characterized in that, At least a portion of the plurality of unlocking channels (3211) are provided through each other, and the portion of the plurality of sliding protrusions (3222) corresponding to the provided unlocking channel (3211) extends along the first axis to the second direction to form an extension (3222a), the extension (3222a) protruding out of the unlocking channel (3211); the outer peripheral wall of the filter element (20) is provided with a pressure plate (22), the pressure plate (22) can act on the extension (3222a).

10. The pre-filter according to claim 9, characterized in that, The unlocking channel (3211) described in part is not a through-hole setting.

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