An assembly method for a pre-filter

Abstract

The application discloses an assembling method of a pre-filter, which comprises the following steps: installing the upper part of a filter core into the space surrounded by an upper shell II, buckling the upper shell I on the other side of the filter core, abutting the upper shell I and the upper shell II to form an upper shell, and exposing the lower part of the filter core from the bottom of the upper shell; installing a circuit board to the inner side of a lower shell I, then installing a display box to the inner side of the lower shell I, and the display box surrounds the circuit board; installing a motor to the inner side of a lower shell II; horizontally inserting the top of the lower shell I into the bottom slot of the upper shell I, and horizontally inserting the top of the lower shell II into the bottom slot of the upper shell II, abutting the lower shell I and the lower shell II to form a lower shell to wrap the lower part of the filter core, and the lower shell can rotate relative to the upper shell; and installing a top shell assembly to the top of the upper shell. The present application is convenient for installing the internal filter core and electrical devices, and improves the assembling efficiency.

Description

Technical Field

[0001] This invention relates to the field of filter technology, and more particularly to a method for assembling a pre-filter. Background Technology

[0002] A pre-filter is the first coarse filtration device for the whole house's water supply. It can filter out sediment, rust, algae, and other large particulate impurities from tap water. It is usually installed after the water meter in the water inlet pipe.

[0003] The pre-filter contains a filter element housed within the space enclosed by the housing. The filter element includes a core, outer shell, inlet, outlet, and drain valve. The outer shell is transparent, and a skeleton component is installed in the gap between the outer shell and the core. A scraper is mounted on the skeleton component. The housing is typically a two-part structure, with the lower shell connected to the drain valve at the bottom. Rotation of the lower shell causes the drain valve and the internal skeleton component to rotate, thereby allowing the scraper to clean the inner wall of the transparent outer shell of the filter element, achieving the cleaning function.

[0004] In automatic pre-filters, the drain valve is driven by a motor to automatically drain water. However, in automatic systems, the lower housing is a single, hollow cylindrical structure, which makes it inconvenient to install the internal drain valve and other electrical components such as the motor and circuit board.

[0005] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0006] In response to the problems mentioned in the background art, the present invention proposes an assembly method for a pre-filter, which facilitates the installation of internal filter elements and electrical components and improves assembly efficiency.

[0007] To achieve the above-mentioned objectives, the present invention employs the following technical solution:

[0008] This invention provides a method for assembling a pre-filter, comprising:

[0009] The upper part of the filter element is installed into the space enclosed by the upper housing II, and the upper housing I is fastened to the other side of the filter element. The upper housing I and the upper housing II are joined to form the upper housing, and the lower part of the filter element is exposed from the bottom of the upper housing.

[0010] The circuit board is installed inside the lower housing I, and then the display box is installed inside the lower housing I, with the display box surrounding the circuit board;

[0011] Install the motor inside the lower housing II;

[0012] The top of the lower housing I is horizontally inserted into the bottom slot of the upper housing I, and the top of the lower housing II is horizontally inserted into the bottom slot of the upper housing II. The lower housing I and the lower housing II are joined together to form a lower housing to wrap the lower part of the filter element. The lower housing can rotate relative to the upper housing.

[0013] A top shell assembly is installed on top of the upper housing.

[0014] In the assembly method of the pre-filter disclosed in this application, the filter element is a whole component. When assembling the pre-filter, the upper housing I and the lower housing II are first snapped onto the front and rear sides of the upper part of the filter element, respectively; then the lower housing I and the lower housing II are snapped onto the filter element. After the four half-housing units are snapped onto the filter element, the installation of the filter element can be completed. There is no need to process complex structures on the housing for limiting or positioning the filter element, which facilitates installation and housing processing.

[0015] The lower housing has a two-part structure. The circuit board and display box are installed inside the lower housing I, and the drive unit is also installed inside the lower housing I. The drain valve body is located in the space between the display box and the drive unit. One side of the drain valve body is connected to the drive unit so that the drive unit can drive it, and the other side of the drain valve body cooperates with the limiting part on the display box so that it can rotate with the lower housing. The overall structure is compact.

[0016] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the front-side filter as viewed from the front according to an embodiment;

[0019] Figure 2 This is a schematic diagram of the structure of the pre-filter according to an embodiment, viewed from the rear.

[0020] Figure 3 This is a schematic diagram of the pre-filter according to the embodiment, omitting the upper housing II and the lower housing II.

[0021] Figure 4 An exploded view of the pre-filter according to an embodiment;

[0022] Figure 5This is a schematic diagram of the upper housing as viewed from the bottom side according to an embodiment;

[0023] Figure 6 This is a schematic diagram of the upper housing I according to an embodiment;

[0024] Figure 7 This is a schematic diagram of the upper housing II according to an embodiment;

[0025] Figure 8 This is a schematic diagram of the lower housing according to an embodiment;

[0026] Figure 9 This is a schematic diagram of the lower housing I according to an embodiment;

[0027] Figure 10 This is a schematic diagram of the mounting structure of the display box on the lower housing I according to an embodiment;

[0028] Figure 11 This is a schematic diagram of the mounting structure of the circuit board on the lower housing I according to the embodiment;

[0029] Figure 12 This is a schematic diagram of the structure of the display box according to an embodiment;

[0030] Figure 13 This is a schematic diagram of the lower housing II according to an embodiment;

[0031] Figure 14 This is a schematic diagram of the motor mounting structure on the lower housing II according to an embodiment;

[0032] Figure 15 This is a schematic diagram of the battery mounting structure on the lower housing II according to an embodiment;

[0033] Figure 16 This is a schematic diagram of the installation structure of the upper housing II and the lower housing II according to an embodiment;

[0034] Figure 17 for Figure 16 Enlarged view of section A in the middle;

[0035] Figure 18 This is a schematic diagram of the lower housing I as viewed from the inside according to an embodiment;

[0036] Figure 19 This is a schematic diagram of the assembly structure of the front viewing window and the front trim piece according to an embodiment;

[0037] Figure 20 This is a schematic diagram of the structure of the front viewing window according to an embodiment;

[0038] Figure 21 This is a structural schematic diagram of the front decorative element according to an embodiment;

[0039] Figure 22 This is a cross-sectional view of the top shell assembly assembled on the housing according to an embodiment;

[0040] Figure 23 This is a top view of the top housing assembly of the pre-filter according to an embodiment;

[0041] Figure 24 This is a structural view of the upper housing according to an embodiment;

[0042] Figure 25 This is a schematic diagram of the assembly structure of the turntable and the top observation window according to an embodiment;

[0043] Figure 26 This is a schematic diagram of the turntable according to an embodiment;

[0044] Figure 27 This is a schematic diagram of the top viewing window according to an embodiment;

[0045] Figure 28 This is a structural schematic diagram of the top decorative element according to an embodiment;

[0046] Figure label:

[0047] 100. Upper housing; 110. Upper housing I; 111. First mounting port; 112. Fourth snap-fit ​​part; 113. Anti-foolproof notch; 114. Third mounting port; 115. First stop part; 116. Boss; 117. Mounting groove; 1171. Outer ring peripheral wall; 1172. Groove bottom; 1173. Snap-fit ​​interface; 120. Upper housing II; 130. Slot; 131. Slot I; 132. Slot II; 141. Lateral extension part; 142. Vertical extension part; 143. Protruding rib; 144. Protrusion; 145. Notch part; 146. Gap; 151. Upper snap I; 152. Upper snap II; 160. Circumferentially extending rib; 170. Second mating part; 171. Concave structure; 172. Raised rib;

[0048] 200. Lower shell; 210. Lower shell I; 211. First mounting post; 212. Second mounting post; 213. First positioning post; 214. First limiting rib; 220. Lower shell II; 221. Third mounting post; 222. Second positioning post; 223. Second limiting rib; 224. Third limiting rib; 225. Cover; 226. Protruding part; 230. Insertion rib; 231. Insertion rib I; 232. Insertion rib II; 241. First mating part I; 242. First mating part II; 243. L-shaped structure; 244. Recessed area; 251. Lower snap I; 252. Lower snap II; 260. Lower circumferential extension rib;

[0049] 300. Filter element; 310. Filter element body; 320. Drain valve body; 330. Inlet; 340. Outlet; 350. Pressure gauge;

[0050] 400. Front observation window; 410. Second raised rib; 411. Second snap-fit ​​part; 412. Protrusion part;

[0051] 500. Front trim piece; 510. Second mounting port; 520. First raised rib; 521. First snap-fit ​​part; 530. Abutment part; 540. Third snap-fit ​​part; 550. Foolproof part;

[0052] 610. Circuit board; 611. First positioning hole; 612. Indicator light; 613. Button;

[0053] 620. Display box; 621. Base plate; 622. Side plate; 623. Lug; 624. Wiring fixing part; 625. Limiting part; 6251. Limiting notch;

[0054] 630. Drive unit; 631. Motor; 632. Battery;

[0055] 700. Top observation window; 710. Observation window body; 720. Flanged edge; 721. Flanged edge locking part; 722. Protrusion;

[0056] 800. Top decorative element; 810. Snap-fit ​​part; 820. First limiting part; 830. Second limiting part; 840. Indicating part; 850. Opening;

[0057] 900. Turntable; 910. Turntable body; 920. First extension rib; 921. Extended rib; 922. Elastic arm; 923. Second stop part; 924. First locking part of the turntable; 930. Second extension rib; 931. Second locking part of the turntable; 932. Insertion port; 940. Date scale; 950. Fourth mounting port; 960. Stepped part;

[0058] 10. Screw; 11. Washer. Detailed Implementation

[0059] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0060] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, 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 application.

[0061] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0062] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0063] 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.

[0064] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0065] This embodiment discloses an automatic pre-filter, which serves as the first coarse filtration device for whole-house water supply, used to filter out sediment, rust, algae and other large particulate impurities from tap water.

[0066] Reference Figures 1 to 4 The pre-filter includes a housing, within which an installation space is formed for installing the filter element 300.

[0067] The housing includes an upper housing 100 and a lower housing 200, which are rotatably connected. The lower housing 200 can rotate relative to the upper housing 100. The upper housing 100 has a two-part structure, which is snapped together and fixed in place. The lower housing 200 also has a two-part structure, which is snapped together and fixed in place.

[0068] The filter element 300 includes components such as a filter element body 310, an inlet 330, an outlet 340, a drain outlet, a drain valve body 320, and a pressure gauge 350. The inlet 330 and outlet 340 are located opposite each other on the upper left and right sides of the filter element body 310, the drain outlet and drain valve body 320 are located at the bottom of the filter element body 310, and the pressure gauge 350 is located at the top of the filter element body 310.

[0069] The rotation of the lower housing 200 can drive the skeleton component (not shown) inside the filter element body 310 to rotate, thereby causing the scraper on the skeleton component to scrape and wash the inner wall of the transparent outer shell of the filter element body 310, thus realizing the scraping and washing function of the filter.

[0070] A top housing assembly is installed on the top of the housing, through which the pressure data of the internal pressure gauge 350 is observed. The top housing assembly includes an observation window (denoted as top observation window 700), a turntable 900, and a decorative element (denoted as top decorative element 800).

[0071] Structural reference of upper shell 100 Figures 5 to 7 The upper housing 100 includes an upper housing I 110 and an upper housing II 120. The upper housing I 110 and the upper housing II 120 are joined together to form an upper mounting cavity for installing the filter element 300.

[0072] Structural reference of lower housing 200 Figures 8 to 14 The lower housing 200 includes a lower housing I 210 and a lower housing II 220, which are joined together to form a lower mounting cavity for installing the filter element 300.

[0073] When the lower housing 200 rotates, it drives the drain valve body 320 to rotate synchronously, which in turn drives the skeleton component inside the filter element 300 to rotate, realizing the scraping function of the scraper on the skeleton component on the inner wall of the filter element 300 outer shell. The scraping of the inner wall of the filter element 300 outer shell by the scraper is a prior art, and the specific structural details and principles will not be described in this article.

[0074] The upper housing I110 is provided with a front observation window 400, which is installed to the upper housing I110 through the front decorative piece 500. The dirt condition of the transparent outer shell of the filter element 300 can be viewed through the front observation window 400.

[0075] In some embodiments, a display box 620 and a circuit board 610 are disposed inside the lower housing I 210. The mounting structure of the circuit board 610 on the lower housing I 210 is described below. Figure 11 The structure of display box 620 is referenced. Figure 12 The mounting structure of the display box 620 on the lower housing I210 is as follows: Figure 10 .

[0076] In some embodiments, the drain valve body 320 is automatically opened and closed by the drive unit 630. (See reference...) Figure 14 The drive unit 630 is located on the lower housing II220.

[0077] The lower housing 200 has a two-part structure. The circuit board 610 and display box 620 are installed inside the lower housing 200. The drive unit 630 is also installed inside the lower housing 200. The drain valve body 320 is located in the space between the display box 620 and the drive unit 630. One side of the drain valve body 320 is connected to the drive unit 630 so that the drive unit 630 can drive it. The other side of the drain valve body 320 engages with the limiting recess 6251 on the display box 620 so that it rotates with the lower housing 200. The overall structure is compact.

[0078] Both the lower housing I 210 and the lower housing II 220 are open-type structures, which facilitates the installation of the drive unit 630, the circuit board 610, and the display box 620.

[0079] In some embodiments, the display box 620 includes a base plate 621 and side plates 622 disposed around the base plate 621. After the display box 620 is fixedly installed on the inner wall of the lower housing I 210, the base plate 621, the side plates 622, and the lower housing I 210 form an installation space for mounting the circuit board 610. The circuit board 610 is fixedly disposed on the inner wall of the lower housing I 210, and the display box 620 surrounds the circuit board 610.

[0080] Since the lower housing 200 adopts a front and rear two-half structure, during installation, the circuit board 610 is first fixed to the inside of the lower housing I210, and then the display box 620 is fixed to the inside of the lower housing I210. Then, the lower housing I210, the circuit board 610, and the display box 620 are assembled with the upper housing I110 as an assembly.

[0081] When installing the display box 620 and circuit board 610, the lower housing I210 has a completely open structure, which facilitates screw driving and installation.

[0082] In some embodiments, refer to Figure 9 , Figure 10 ,as well as Figure 12 The upper and lower sides of the side plate 622 are respectively provided with lugs 623, which are arranged diagonally opposite each other. The lower housing I210 is provided with two corresponding first mounting posts 211. The lugs 623 are fixedly connected to the corresponding first mounting posts 211 by fasteners such as screws 10. The display box 620 can be fixedly installed by two screws.

[0083] In some embodiments, the lower housing I 210 is provided with two sets of opposing first limiting ribs 214, which abut against the corresponding side plates 622. Specifically, there are four first limiting ribs 214, which abut against the four side plates 622 respectively to limit the left-right and up-down displacement of the display box 620, and also serve as a pre-positioning device for installation, so that the first mounting post 211 is aligned with the lug 623 for easy screwing.

[0084] In some embodiments, refer to Figure 12 The side panel 622 is provided with a wire fixing part 624. The wire fixing part 624 is an L-shaped hook structure, which is used to fix and limit the wires led out from the internal circuit board 610, thereby improving the reliability of the wire routing.

[0085] In some embodiments, refer to Figure 9 and Figure 11 The lower housing I210 is provided with two obliquely arranged second mounting posts 212 and two obliquely arranged first positioning posts 213. The circuit board 610 is provided with two first positioning holes 611. The first positioning posts 213 are inserted into the corresponding first positioning holes 611. The circuit board 610 is fixedly connected to the second mounting posts 212 by fasteners such as screws 10.

[0086] When installing the circuit board 610, first insert the first positioning post 213 into the first positioning hole 611 on the circuit board 610 to achieve the pre-positioning of the circuit board 610, and then fix the circuit board 610 to the second mounting post 212 by screw 10.

[0087] In this specific embodiment, the second mounting post 212 and the first positioning post 213 are respectively located at the four corners of the circuit board 610, which improves the installation stability of the circuit board 610, and the circuit board 610 can be fixed by two screws.

[0088] In some embodiments, refer to Figure 8 The outer side of the lower housing Ⅰ210 is provided with an indicator light 612 and a button 613, which are connected to the circuit board 610.

[0089] Button 613 is used to control the opening and closing of the drain valve body 320 to realize the automatic drainage of the pre-filter.

[0090] When the pre-filter is draining, indicator light 612 will illuminate.

[0091] In some embodiments, refer to Figure 3 , Figure 10 ,as well as Figure 12 The side plate 622 has a limiting part 625 on the side facing the drain valve body 320 for limiting the drain valve body 320.

[0092] Specifically, the limiting part 625 is a plate-shaped structure that extends horizontally from the side plate 622. The end of the limiting part 625 forms a limiting notch 6251, and the shape of the limiting notch 6251 is adapted to the irregular outer contour of the drain valve body 320.

[0093] In this specific embodiment, the outer contour of the drain valve body 320 is hexagonal, and the corresponding limiting recess 6251 is a triangular structure. After the lower housing Ⅰ210 is installed in place, one side of the drain valve body 320 is precisely embedded in the limiting recess 6251, achieving limiting. Thus, when the lower housing 200 rotates, it drives the drain valve body 320 to rotate as a whole, which in turn drives the skeleton component inside the filter element 300 to rotate, realizing the scraping function of the scraper on the skeleton component on the inner wall of the filter element 300 outer shell.

[0094] The display box 620 also serves as a limiter for the drain valve body 320, integrating multiple functions, eliminating the need for an additional limiter structure for the drain valve body 320 within the lower housing 200.

[0095] In some embodiments, the drive unit 630 includes a motor 631 and a battery 632, with the power output end of the motor 631 connected to the drain valve body 320.

[0096] Reference Figures 13 to 15 The lower housing II 220 has a protruding bulge 226 that protrudes outward toward the outer side of the lower housing II 220. A first space and a second space are formed inside the protruding bulge 226. The first space communicates with the lower mounting cavity enclosed by the lower housing 200.

[0097] The motor 631 is located inside the lower housing II 220, and a part of the motor 631 is located in the first space to reduce the volume occupied by the motor 631 in the lower mounting cavity and provide sufficient installation space for the filter element 300.

[0098] The battery 632 is located in the second space, the opening of the second space faces the outside of the pre-filter, and a cover 225 is provided on the second space for closing or opening the second space.

[0099] In some embodiments, a third mounting post 221, a second limiting rib 223, and a third limiting rib 224 are fixedly provided on the lower housing II 220.

[0100] There are two second limiting ribs 223 arranged opposite to each other. The two second limiting ribs 223 abut against the left and right side walls of the motor 631 to limit the horizontal left and right displacement of the motor 631.

[0101] The third limiting rib 224 abuts against the bottom of the motor 631, and the motor 631 is fixedly connected to the third mounting post 221 by fasteners such as screws 10, so as to achieve the fixed installation of the motor 631.

[0102] A second positioning post 222 is fixed on the lower housing II 220, and a corresponding second positioning hole (not shown) is provided on the motor 631. The installation of the motor 631 is pre-positioned by the second positioning post 222.

[0103] In this specific embodiment, there are three third mounting posts 221, two of which are located at the top and one at the bottom. The third mounting post 221 located at the bottom also serves to abut against the bottom of the motor 631.

[0104] There are two second positioning posts 222, located between the two upper third mounting posts 221.

[0105] When the motor 631 is fastened by the screw 10, a washer 11 is provided between the screw 10 and the third mounting post 221. The washer 11 is in contact with the wall of the motor 631 to limit and fix the motor 631.

[0106] Regarding the rotatable connection structure between the upper housing 100 and the lower housing 200, in some embodiments, refer to Figure 5 , Figure 8 ,as well as Figures 16 to 17 The bottom of the upper housing 100 is provided with a slot 130, which extends circumferentially along the upper housing 100 and the opening of the slot 130 faces outward; the top of the lower housing I 210 and the lower housing II 220 are provided with a connecting rib 230, which is inserted into the slot 130. When the lower housing 200 rotates, the connecting rib 230 rotates along the slot 130.

[0107] A plug-in structure is added at the joint between the lower housing 200 and the upper housing 100 in the vertical direction to improve the assembly reliability between the lower housing 200 and the upper housing 100, reduce the assembly gap, and the plug-in structure guides the rotation of the lower housing 200, thereby improving the smoothness of the rotation of the lower housing 200.

[0108] When installing the lower housing 200, insert the lower housing I 210 horizontally into the slot 130 of the upper housing I 110 to achieve the insertion of the upper housing I 110 with the upper housing I 110; insert the lower housing II 220 horizontally into the slot 130 of the upper housing II 120 to achieve the insertion of the lower housing II 220 with the upper housing II 120. The insertion installation process is easy to operate and convenient to install.

[0109] Furthermore, when the lower housing 200 rotates, the insertion rib 230 slides along the slot 130, serving as a guide for the rotation of the lower housing 200.

[0110] In one specific embodiment, reference is made to Figure 6 and Figure 7 The bottom of the upper housing I110 is provided with slot I131, which extends circumferentially along the upper housing I110. The bottom of the upper housing II120 is provided with slot II132, which extends circumferentially along the upper housing II120.

[0111] Reference Figure 9 and Figure 13 The bottom of the lower shell I210 is provided with a connecting rib I231, which extends circumferentially along the lower shell I210. The bottom of the lower shell II220 is provided with a connecting rib II232, which extends circumferentially along the lower shell II220.

[0112] Connector I 231 is horizontally inserted into slot I 131 to connect the upper housing I 110 and the lower housing I 210. Connector II 232 is horizontally inserted into slot II 132 to connect the upper housing II 120 and the lower housing II 220.

[0113] In some embodiments, the upper housing I110 and the upper housing II120 are connected by a snap-fit, and the lower housing I210 and the lower housing II220 are connected by a snap-fit.

[0114] Specifically, refer to Figure 6 and Figure 7 The upper housing I110 has multiple upper buckles I151 spaced apart along its height direction on its side, and the upper housing II120 has multiple upper buckles II152 spaced apart along its height direction on its side. The multiple upper buckles I151 and the multiple upper buckles II152 are engaged one-to-one to achieve the engagement and fixation of the upper housing I110 and the upper housing II120.

[0115] Similarly, refer to Figure 9 and Figure 13 The lower housing I210 has multiple lower buckles I251 spaced apart along its height direction on its side, and the lower housing II220 has multiple lower buckles II252 spaced apart along its height direction on its side. The multiple lower buckles I251 and the multiple lower buckles II252 are engaged one-to-one to achieve the engagement and fixation of the lower housing I210 and the lower housing II220.

[0116] In some embodiments, refer to Figure 6 and Figure 7 The bottom of the upper housing 100 is provided with a lateral extension 141 extending toward the inner side of the upper mounting cavity. The lateral extension 141 has a vertical extension 142 extending downward at one end away from the upper housing 100. The vertical extension 142 has a protruding rib 143 on the side opposite to the upper mounting cavity. The protruding rib 143 extends circumferentially along the upper housing 100, and a slot 130 is formed between the protruding rib 143 and the lateral extension 141.

[0117] The horizontal extension 141 and the vertical extension 142 allow the slot 130 to be recessed into the outer peripheral wall of the upper housing 100. In this way, after the lower housing 200 is inserted into the upper housing 100, the outer peripheral walls of the upper housing 100 and the lower housing 200 can be on the same circumferential surface, and the overall appearance of the machine is a single unit.

[0118] Furthermore, in combination Figure 3 The space enclosed by the vertical extension 142 also plays a certain role in limiting the filter element body, which helps to improve the installation stability of the filter element body.

[0119] In some embodiments, refer to Figure 6 A protrusion 144 is provided at the end of the vertical extension 142 on the upper housing I 110, and the protrusion 144 faces the upper housing II 120. (Refer to...) Figure 7 A notch 145 is provided at the end of the vertical extension 142 on the upper housing II 120, with the notch 145 facing the upper housing I 110. (Refer to...) Figure 5 The protrusion 144 is engaged within the notch 145. When the upper housing I 110 and the upper housing II 120 are engaged and connected, the fit between the protrusion 144 and the notch 145 serves to align the installation and also helps to improve the stability of the structure installation.

[0120] In some embodiments, refer to Figure 5 The protruding ribs 143 on the upper shell I110 and the protruding ribs 143 on the upper shell II120 have a gap 146 at their close positions, which helps to eliminate machining errors and avoid the protruding ribs 143 on both sides abutting each other due to machining errors, thus affecting the normal docking and clamping of the upper shell I110 and the upper shell II120.

[0121] In some embodiments, refer to Figure 9 There are two insertion ribs I231, which are arranged at intervals along the circumference of the lower shell I210. The inner wall of the lower shell I210 is provided with a first mating part I241, which is located between the two insertion ribs I231.

[0122] Reference Figure 13 There are two insertion ribs II232, which are arranged at intervals along the circumference of the lower shell II220. The inner wall of the lower shell II220 is provided with a first mating part II242, which is located between the two insertion ribs II232.

[0123] Reference Figure 5 A second mating part 170 is provided on the vertical extension 142 on the upper housing I 110 or the upper housing II 120. Either the first mating part I 241 or the first mating part II 242 rotates with the lower housing 200 to engage with or disengage from the second mating part 170, while the other abuts against the vertical extension 142.

[0124] In this specific embodiment, a second mating portion 170 is provided on the vertical extension portion 142 on the upper housing II 120. The second mating portion 170 is a concave structure 171 provided on the vertical extension portion 142, and a raised rib 172 is provided on the concave structure 171. Correspondingly, the first mating portion II 242 is an L-shaped structure 243, the vertical portion of the L-shaped structure 243 is arc-shaped, the arc direction is opposite to the arc direction of the vertical extension rib, and a recessed area 244 is provided on the vertical portion of the L-shaped structure 243. The structure of the first mating portion I 241 is similar to that of the first mating portion II 242, also an L-shaped structure 243, but without the recessed area 244.

[0125] After the upper housing 100 and the lower housing 200 are inserted, the vertical portion of the first mating part I 241 abuts against the vertical extension 142 of the upper housing I 110, while the recessed area 244 on the first mating part II 242 engages with the protruding rib 172 on the second mating part 170.

[0126] The arrangement of the first mating part I 241 and the first mating part II 242 serves two purposes. First, by abutting against the vertical extension 142 on the upper housing 100, it helps to improve the stability of the upper housing 100 and the lower housing 200 after they are fitted together. Second, the recessed area 244 on the first mating part II 242 and the protruding rib 172 on the second mating part 170 provide a rotational feel for the rotation of the lower housing 200.

[0127] In some embodiments, a circumferentially extending rib 160 is provided on the inner wall of either the upper housing I110 or the upper housing II120, and the end of the circumferentially extending rib 160 extends beyond the docking position of the upper housing I110 and the upper housing II120.

[0128] In this specific embodiment, refer to Figure 7 The inner wall of the upper shell II 120 is provided with a circumferentially extending rib 160. The end of the circumferentially extending rib 160 extends out of the lateral edge of the upper shell II 120. When the upper shell I 110 is connected to the upper shell II 120, the end of the circumferentially extending rib 160 extends into one side of the upper shell II 120. The setting of the circumferentially extending rib 160 helps to improve the structural strength. On the other hand, the protruding end of the circumferentially extending rib 160 serves as a guide for installation, and the upper shell I 110 is snapped onto the upper shell II 120 along the protruding end of the circumferentially extending rib 160.

[0129] Similarly, a circumferentially extending rib 260 is provided on the inner wall of either the lower shell I 210 or the lower shell II 220, and the end of the circumferentially extending rib 260 extends beyond the docking position of the lower shell I 210 and the lower shell II 220.

[0130] In this specific embodiment, the inner wall of the lower housing II 220 is provided with a lower circumferential extending rib 260. Its specific function is the same as that of the upper circumferential extending rib 160, and will not be elaborated further.

[0131] In some embodiments, the specific structure of the front observation window 400 is described in reference to... Figures 18 to 21 The housing (specifically the upper housing I110) is provided with a third mounting port 114 that is directly opposite the main body of the filter element 300.

[0132] A decorative element (referred to as front decorative element 500) is provided at the third mounting opening 114. The front decorative element 500 is provided with a second mounting opening 510. The front decorative element 500 is provided with a first protruding rib 520 on the side facing the mounting space. The first protruding rib 520 extends circumferentially along the second mounting opening 510. There is a certain distance between the first protruding rib 520 and the edge of the second mounting opening 510 to form abutment 530.

[0133] The front observation window 400 is located at the second mounting opening 510. The front observation window 400 is located within the area enclosed by the first protruding rib 520. The side of the front observation window 400 that is away from the mounting space abuts against the abutment part 530.

[0134] The front viewing window 400 is installed on the inside of the front trim piece 500. The installation stability of the front viewing window 400 is improved by the abutment part 530 abutting against the circumferential edge of the front viewing window 400 and the first protruding rib 520 limiting the circumferential position of the front viewing window 400. At the same time, the area obstructed by the abutment part 530 against the circumferential edge of the front viewing window 400 is very small. From the outside of the front filter, the overlap area between the front viewing window 400 and the abutment part 530 is not visible and does not affect the appearance of the front viewing window 400.

[0135] In some embodiments, refer to Figures 19 to 21 The first protruding rib 520 is provided with a plurality of spaced-apart first snap-fit ​​portions 521. The circumferential side edge of the front observation window 400 is provided with a second protruding rib 410 on the side facing the installation space, and the second protruding rib 410 is provided with a second snap-fit ​​portion 411. The second snap-fit ​​portion 411 snaps into the first snap-fit ​​portion 521, thereby realizing the snap-fit ​​fixation between the front observation window 400 and the front decorative piece 500.

[0136] The setting of the second protruding rib 410 helps to improve the structural strength of the circumferential edge of the front observation window 400, thereby improving the stability of the snap-fit ​​structure.

[0137] In this specific embodiment, the first snap-fit ​​part 521 is a snap-fit ​​structure, and the second snap-fit ​​part 411 is a raised rib structure. When installing the front viewing window 400, the front viewing window 400 is pressed from the inside of the front decorative part 500 toward the front decorative part 500, and the raised rib of the second snap-fit ​​part 411 can be snapped into the snap-fit ​​of the first snap-fit ​​part 521 to complete the snap-fit.

[0138] In some embodiments, refer to Figure 19 and Figure 20 The second protruding rib 410 is provided with a bulge 412, which abuts against the first protruding rib 520.

[0139] The bulge 412 is provided to eliminate processing errors, facilitate the installation of the front observation window 400 into the area enclosed by the first protruding rib 520, and improve the installation stability of the front observation window 400 by the abutment between the bulge 412 and the first protruding rib 520, thus preventing the front observation window 400 from shifting.

[0140] In some embodiments, the second protruding ribs 410 on different sides of the front viewing window 400 are respectively provided with bulges 412. That is, bulges 412 are provided around the front viewing window 400 to ensure easy installation and stable installation on each side of the front viewing window 400.

[0141] In some embodiments, refer to Figure 18 and Figure 21The front decorative part 500 is installed from the outside of the housing to the third mounting port 114. The front decorative part 500 is provided with a third snap-fit ​​part 540. The inner side of the housing (specifically the upper housing I 110) is provided with a fourth snap-fit ​​part 112 near the third mounting port 114. The third snap-fit ​​part 540 and the fourth snap-fit ​​part 112 snap-fit ​​together to achieve the snap-fit ​​fixation of the front decorative part 500 and the upper housing I 110.

[0142] During installation, first assemble the front observation window 400 and the front trim piece 500 together, and then install the front trim piece 500 onto the upper housing I110.

[0143] In some embodiments, the front trim 500 has a foolproof part 550 on the side facing the installation space, and a foolproof notch 113 is provided on the wall surrounding the third installation opening 114. The foolproof part 550 is located in the foolproof notch 113 to prevent the front trim 500 from being installed backwards.

[0144] In some embodiments, refer to Figures 22 to 24 The top of the housing (specifically the upper housing 110) is provided with a third mounting port 114, and the pressure gauge 350 is directly opposite the third mounting port 114.

[0145] A turntable 900 is rotatably mounted at the third mounting port 114, and a fourth mounting port 950 is provided on the turntable 900. A top observation window 700 is located at the fourth mounting port 950. The turntable 900 and the top observation window 700 constitute an assembly that covers the third mounting port 114.

[0146] The turntable 900 is used to record the cleaning date of the filter element 300 so that the user can clearly know the last cleaning date of the filter element.

[0147] The top observation window 700 is directly opposite the pressure gauge 350 and is used to observe the pressure data on the pressure gauge 350. Because the top observation window 700 is positioned at the top, users can easily view the pressure data without having to squat down, ensuring accurate data readings regardless of changes in viewing angle.

[0148] Reference Figure 23 The turntable 900 has multiple date scales 940, which are arranged at intervals along the circumference of the turntable 900. Figure 23 In the text, the numbers 1-12 represent months. Further subdividing each month's range into smaller grids allows users to clearly see the exact time of the last filter cleaning.

[0149] An indicator 840 is provided on the top of the upper housing 110 or on the top observation window 700, the indicator 840 being used to indicate the date scale 940. Figure 23 In the middle, the indicator part 840 is provided on the top decorative part 800 on the top of the upper housing 110.

[0150] In actual use, after the filter element 300 is cleaned, manually rotate the turntable 900 to align the date of the filter element cleaning with the indicator. When the filter element is cleaned again, the user can check the date indicated by the indicator 840 to know the specific time of the last filter element cleaning.

[0151] The indicator 840 can be an arrow or other pattern, raised dots, etc. If the indicator 840 is placed on the top observation window 700, in order not to interfere with the viewing of pressure data, the indicator 840 should be placed close to the circumferential edge of the top observation window 700.

[0152] In some embodiments, the structure of turntable 900 is referenced. Figure 26 The turntable 900 includes a turntable body 910, which is a ring-shaped plate structure. The turntable body 910 has a first extension rib 920 on the side facing the third mounting port 114. The first extension rib 920 extends circumferentially along the turntable body 910, and a plurality of turntable first snap-fit ​​portions 924 are provided on the first extension rib 920 at intervals.

[0153] In reference Figure 24 The top of the upper housing 110 is provided with a boss 116, and the boss 116 is provided with a third mounting port 114.

[0154] The first extension rib 920 is inserted into the third mounting port 114, the first snap-fit ​​part 924 of the turntable snaps into the bottom of the boss 116, and the turntable body 910 abuts against the bottom of the boss 116, so as to fix the turntable 900 into the third mounting port 114.

[0155] By combining snapping and abutting, the installation reliability of turntable 900 at the third mounting port 114 is improved, effectively limiting the vertical displacement of turntable 900 and preventing it from moving up and down.

[0156] Furthermore, when the turntable 900 is rotated, the first extension rib 920 and the inner peripheral wall of the third mounting port 114 play a role in rotation guidance, which helps to improve the smoothness of the rotation of the turntable 900.

[0157] In some embodiments, the first snap-fit ​​portion 924 of the turntable is a convex strip structure extending along the first extending rib 920.

[0158] In some embodiments, refer to Figure 24 A plurality of first stop portions 115 are provided at intervals along the circumference of the sidewall forming the third mounting opening 114. (Refer to...) Figure 26 The first extension rib 920 has a second stop portion 923 on the side facing the first stop portion 115. The first stop portion 115 and the second stop portion 923 cooperate to stop the turntable 900.

[0159] The circumferential stop of the turntable 900 is achieved through the cooperation between the first stop part 115 and the second stop part 923, so that the turntable 900 stops at a certain date mark 940.

[0160] In some embodiments, the first stop portion 115 is a recessed structure, and the recessed structure of the first stop portion 115 surrounds the inner peripheral wall of the third mounting opening 114. The second stop portion 923 is a protruding structure, and one or more protruding structures are provided in the second stop portion 923, but the number of protruding structures is less than the number of recessed structures in the first stop portion 115, so as to allow the turntable 900 to rotate.

[0161] When the turntable 900 rotates, the cooperation between the recessed structure of the first stop part 115 and the protruding structure of the second stop part 923 also provides the user with a sense of rotation.

[0162] In some embodiments, refer to Figure 26 The first extension rib 920 is provided with an extension rib 921, which extends downward from the first extension rib 920. The extension rib 921 is provided with an elastic arm 922, which extends upward from the extension rib 921. The first extension rib 920 and the extension rib 921 are provided with notches to make way for the elastic arm 922. The free end of the elastic arm 922 is provided with a second stop portion 923 on the side facing the first stop portion 115.

[0163] When the turntable 900 is installed, the extension rib 921 undergoes elastic deformation inward and extends into the mounting opening at the top of the upper housing 110, which facilitates the installation of the turntable 900.

[0164] When the turntable 900 is rotated, the elastic arm 922 undergoes elastic deformation, which facilitates the separation between the recessed structure of the first stop part 115 and the protruding structure of the second protruding part 722, thus facilitating the rotation of the turntable 900.

[0165] In some embodiments, two extension ribs 921 are provided, which are arranged opposite to each other. Each extension rib 921 is provided with an elastic arm 922 so that the installation and rotation of the turntable 900 on opposite sides are synchronized.

[0166] In some embodiments, when the second stop portion 923 is engaged with any of the first stop portions 115, the indicator portion 840 indicates a certain date mark 940, so that after the turntable 900 is rotated, it stops at the position of the certain date mark 940.

[0167] In some embodiments, continue to refer to Figure 26The turntable body 910 has a second extension rib 930 on the side facing the third mounting port 114. The second extension rib 930 extends circumferentially along the turntable body 910. The second extension rib 930 is located in the area enclosed by the first extension rib 920. The second extension rib 930 has a turntable second snap-fit ​​part 931. The second extension rib 930 encloses the fourth mounting port 950.

[0168] Reference Figure 27 The top observation window 700 includes an observation window body 710, which is a circular plate structure. The observation window body 710 has a flange 720 on the side facing the fourth mounting port 950. The flange 720 has a flange snap-fit ​​part 721. The flange 720 extends into the fourth mounting port 950. The flange snap-fit ​​part 721 snaps into the second snap-fit ​​part 931 of the turntable to fix the top observation window 700 onto the turntable 900. The observation window body 710 covers the fourth mounting port 950.

[0169] In some embodiments, the second locking part 931 of the turntable is a bayonet, the flanged locking part 721 is a hook, and the top observation window 700 is mounted upward from the bottom side of the turntable 900, as shown in the reference. Figure 26 A step 960 is formed between the top edge of the side wall surrounding the fourth installation opening 950 and the second extension rib 930. The top of the observation window body 710 abuts against the step 960, thus achieving double fixation after the top observation window 700 is installed, effectively limiting the displacement of the top observation window 700 in the vertical direction, and preventing the top observation window 700 from moving up and down.

[0170] In some embodiments, refer to Figure 26 Multiple insertion slots 932 are provided at intervals on the second extension rib 930, and then refer to Figure 27 A protrusion 722 is provided on the flange 720, and the protrusion 722 is inserted into the socket 932.

[0171] The fit between the protrusion 722 and the socket 932 serves two purposes: firstly, it guides the installation of the top observation window 700, facilitating its installation; secondly, it prevents the top observation window 700 from circumferentially rotating after installation.

[0172] The top observation window 700 and the turntable 900 are assembled as a whole. When the turntable 900 rotates, the top observation window 700 rotates synchronously with the turntable 900. At this time, the indicator 840 cannot be set on the top observation window 700, but can only be set on the top decorative part 800.

[0173] In some embodiments, the mounting structure of the top decorative element 800 refers to... Figure 22 The structure of the top decorative element 800 is referenced. Figure 28The top of the upper housing 110 is provided with a mounting groove 117, which extends circumferentially along the top of the upper housing 110 and surrounds the third mounting opening 114. The top decorative piece 800 is engaged in the mounting groove 117. The top decorative piece 800 has a first limiting part 820 and a second limiting part 830 on the side facing the mounting groove 117. The first limiting part 820 abuts against the circumferential sidewall (specifically the outer circumferential wall 1171) of the mounting groove 117 to limit the horizontal displacement of the top decorative piece 800, and the second limiting part 830 abuts against the bottom 1172 of the mounting groove 117 to limit the longitudinal displacement of the top decorative piece 800.

[0174] The top decorative element 800 has an opening 850, which is directly opposite the third mounting port 114, so as not to interfere with the installation of the turntable 900 and the top observation window 700.

[0175] The top decorative piece 800 is fixed by a snap-fit ​​structure. The first limiting part 820 abuts against the circumferential sidewall of the mounting groove 117, and the second limiting part 830 abuts against the bottom 1172 of the mounting groove 117, effectively limiting the lateral and longitudinal displacement of the top decorative piece 800 and improving its installation stability. Furthermore, installation is convenient; the top decorative piece 800 can be simply snapped into the mounting groove 117 from top to bottom.

[0176] In some embodiments, refer to Figure 24 The bottom 1172 of the mounting slot 117 is provided with multiple card interfaces 1173, which are arranged at intervals along the circumference of the mounting slot 117.

[0177] Refer to Figure 28 The top decorative piece 800 has multiple snap-fit ​​parts 810 on the side facing the mounting groove 117, and the multiple snap-fit ​​parts 810 are snap-fitted one by one with the multiple snap-fit ​​interfaces 1173.

[0178] The top decorative piece 800 is effectively secured in the mounting groove 117 by the snap-fit ​​between multiple snap-fit ​​parts 810 and multiple snap-fit ​​interfaces 1173.

[0179] In this specific embodiment, card interfaces 1173 are respectively provided at the four corners of the mounting groove 117, and correspondingly, four card contacts 810 are provided on the top decorative part 800.

[0180] In some embodiments, refer to Figure 28 A first limiting part 820 and a second limiting part 830 are provided between two adjacent snap-fit ​​parts 810. That is, the first limiting part 820 and the second limiting part 830 are provided between any two snap-fit ​​positions of the top decorative part 800 and the mounting groove 117, so that each side of the top decorative part 800 can be effectively limited in lateral and longitudinal displacement, and the phenomenon of the top decorative part 800 lifting on one side is avoided.

[0181] In some embodiments, the first limiting portion 820 is an extension piece extending downward from the top decorative piece 800, and the first limiting portion 820 abuts against the outer peripheral wall 1171 of the mounting groove 117.

[0182] The first limiting part 820 serves both as a limiting part and as a guide part during the installation of the top decorative part 800, as it moves downward along the outer circumferential wall 1171 of the mounting groove 117.

[0183] In some embodiments, the second limiting portion 830 is an extension piece extending downward from the top decorative piece 800, and the second limiting portion 830 is provided on both sides of the snap-fit ​​portion 810.

[0184] When the four corners of the top decorative piece 800 are pressed down to make the snap-fit ​​part 810 move downward to snap into the snap-fit ​​interface 1173, the two second limiting parts 830 provided adjacent to the snap-fit ​​part 810 can effectively prevent the pressing part from moving downward too much.

[0185] In some embodiments, the assembly method of the automatic pre-filter is as follows:

[0186] The upper part of the filter element 300 is installed into the space enclosed by the upper housing II 120. The upper housing I 110 is fastened to the other side of the filter element 300. The upper housing I 110 and the upper housing II 120 are joined to form the upper housing 100. The lower part of the filter element 300 is exposed from the bottom of the upper housing 100.

[0187] The circuit board 610 is installed inside the lower housing I 210, and then the display box 620 is installed inside the lower housing I 210, with the display box 620 surrounding the circuit board 610.

[0188] Install motor 631 inside the lower housing II220;

[0189] The top of the lower housing I 210 is horizontally inserted into the bottom slot 130 of the upper housing I 110, and the top of the lower housing II 220 is horizontally inserted into the bottom slot 130 of the upper housing II 120. The lower housing I 210 and the lower housing II 220 are joined to form the lower housing 200 to wrap the lower part of the filter element 300. The lower housing 200 can rotate relative to the upper housing 100.

[0190] A top shell assembly is installed on top of the upper shell 100.

[0191] In some embodiments, the filter element 300 includes a filter element 300 body and a drain valve body 320 disposed at the bottom of the filter element 300 body;

[0192] The display box 620 is provided with a limiting notch 6251 for limiting the drain valve body 320;

[0193] When the lower housing I210 is inserted and installed onto the upper housing I110, the limiting notch 6251 is adapted to the irregular outer contour of the drain valve body 320 to limit the drain valve body 320.

[0194] When the lower housing II220 is inserted and installed onto the upper housing II120, the motor 631 is connected to the drain valve body 320.

[0195] In some embodiments, when the motor 631 is installed on the lower housing II 220, the motor 631 is placed on the third limiting rib 224 on the inner wall of the lower housing II 220, the bottom of the motor 631 abuts against the third limiting rib 224, the left and right sides of the motor 631 abut against the second limiting rib 223 on the inner wall of the lower housing II 220, the positioning hole on the motor 631 is inserted into the positioning post on the inner wall of the lower housing II 220, and then the motor 631 is fixed to the mounting post on the inner wall of the lower housing II 220 by fasteners.

[0196] In some embodiments, the inner wall of the upper housing II 120 is provided with a circumferentially extending rib 160, the two ends of which extend out of the left and right sides of the upper housing II 120. When the upper housing I 110 is installed, the inner walls of the left and right sides of the upper housing I 110 approach the upper housing II 120 along the extended ends of the circumferentially extending rib 160 and are fastened to the upper housing II 120.

[0197] The inner wall of the lower housing II220 is provided with a lower circumferential extension rib 260. The two ends of the lower circumferential extension rib 260 extend out of the left and right sides of the lower housing II220. When the lower housing I210 is installed, the inner walls of the left and right sides of the lower housing I210 approach the lower housing II220 along the extended ends of the lower circumferential extension rib 260 and are fastened to the lower housing II220.

[0198] In some embodiments, the inner wall of the lower housing I 210 is provided with a first mating part I 241, and the inner wall of the lower housing II 220 is provided with a first mating part II 242;

[0199] The bottom of the upper housing I110 and the upper housing II120 are respectively provided with a downwardly extending vertical extension 142, and the vertical extension 142 is provided with a slot 130 for inserting the lower housing I210 and the lower housing II220.

[0200] When the top of the lower housing I210 is horizontally inserted into the bottom slot 130 of the upper housing I110, the first mating part I241 abuts against the vertical extension 142 on the corresponding side;

[0201] When the top of the lower housing II 220 is horizontally inserted into the bottom slot 130 of the upper housing II 120, the first mating part II 242 abuts against the vertical extension 142 on the corresponding side.

[0202] In some embodiments, before fastening the upper housing I110, the front decorative piece 500 and the front viewing window 400 are first installed at the mounting opening of the upper housing I110. The front viewing window 400 is first installed to the inside of the front decorative piece 500, with the front viewing window 400 protruding from the central opening area of ​​the front decorative piece 500. Then, the front decorative piece 500 is installed from the outside to the inside at the mounting opening of the upper housing I110.

[0203] In some embodiments, when installing the top housing assembly, the top trim 800 is first fastened to the top of the upper housing 100, and then the assembly consisting of the date dial 900 and the top viewing window 700 is installed. The assembly is fastened to the top of the upper housing 100 and is located in the central opening area of ​​the date dial 900.

[0204] In other embodiments, when installing the top shell assembly, the assembly consisting of the date dial 900 and the top viewing window 700 is installed first, and the assembly is fastened to the top of the upper shell 100. Then, the top decorative piece 800 is fastened to the top of the upper shell 100, and the assembly is located in the central opening area of ​​the date dial 900.

[0205] In some embodiments, the top of the upper housing 100 is provided with a mounting groove 117, and the bottom 1172 of the mounting groove 117 is provided with a card interface 1173. The mounting groove 117 extends circumferentially along the upper housing 100.

[0206] The top decorative piece 800 has a snap-fit ​​part 810, a first limiting part 820 and a second limiting part 830 on the side facing the mounting groove 117. When installing the decorative piece, the first limiting part 820 is inserted into the mounting groove 117 along the outer circumferential wall 1171 of the mounting groove 117, and is inserted to a stop position when the second limiting part 830 abuts against the bottom 1172 of the mounting groove 117. The snap-fit ​​part 810 snaps into the snap-fit ​​interface 1173, and the top decorative piece 800 covers the top opening of the mounting groove 117.

[0207] In some embodiments, the date dial 900 is provided with a first extension rib 920, which extends circumferentially along the date dial 900. The first extension rib 920 is provided with a downwardly extending extension rib 921, and the extension rib 921 is provided with an elastic arm 922, which extends upward from the extension rib 921. The first extension rib 920 and the extension rib 921 are provided with notches to make way for the elastic arm 922.

[0208] When the date turntable 900 is installed in the top mounting port of the upper housing 100, the extension rib 921 undergoes elastic deformation to guide the first extension rib 920 downward into the mounting port, and the protruding structure on the elastic arm 922 is adapted to the recessed structure on the inner peripheral wall of the mounting port.

[0209] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0210] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for assembling a pre-filter, characterized in that, include: The upper part of the filter element is installed into the space enclosed by the upper housing II, and the upper housing I is fastened to the other side of the filter element. The upper housing I and the upper housing II are joined to form the upper housing, and the lower part of the filter element is exposed from the bottom of the upper housing. The circuit board is installed inside the lower housing I, and then the display box is installed inside the lower housing I. The display box surrounds the circuit board, and the display box is provided with a limiting notch for limiting the drain valve body. The motor is installed inside the lower housing II, and the motor is connected to the drain valve body; The top of the lower housing I is horizontally inserted into the bottom slot of the upper housing I, and the top of the lower housing II is horizontally inserted into the bottom slot of the upper housing II. The lower housing I and the lower housing II are joined together to form a lower housing to wrap the lower part of the filter element, so that the drain valve body is located in the space between the display box and the motor, and the lower housing can rotate relative to the upper housing. A top shell assembly is installed on top of the upper housing.

2. The assembly method according to claim 1, characterized in that, The filter element includes a filter element body and a drain valve body located at the bottom of the filter element body; When the lower housing I is inserted into the upper housing I, the limiting notch is adapted to the irregular outer contour of the drain valve body to limit the position of the drain valve body; When the lower housing II is inserted into the upper housing II, the motor is connected to the drain valve body.

3. The assembly method according to claim 1, characterized in that, When installing the motor onto the lower housing II, the motor is placed on the third limiting rib on the inner wall of the lower housing II, with the bottom of the motor abutting against the third limiting rib, and the left and right sides of the motor abutting against the second limiting rib on the inner wall of the lower housing II. The positioning hole on the motor is inserted into the positioning post on the inner wall of the lower housing II, and then the motor is fixed to the mounting post on the inner wall of the lower housing II by fasteners.

4. The assembly method according to claim 1, characterized in that, The inner wall of the upper housing II is provided with a circumferentially extending rib. The two ends of the circumferentially extending rib extend out of the left and right sides of the upper housing II. When the upper housing I is installed, the inner walls of the left and right sides of the upper housing I approach the upper housing II along the extended ends of the circumferentially extending rib and are fastened to the upper housing II. The inner wall of the lower housing II is provided with a lower circumferential extension rib. The two ends of the lower circumferential extension rib extend out of the left and right sides of the lower housing II. When the lower housing I is installed, the inner walls of the left and right sides of the lower housing I approach the lower housing II along the extended ends of the lower circumferential extension rib and are fastened to the lower housing II.

5. The assembly method according to claim 1, characterized in that, The inner wall of the lower housing I is provided with a first mating part I, and the inner wall of the lower housing II is provided with a first mating part II; The bottom of the upper housing I and the upper housing II are respectively provided with downwardly extending vertical extensions, and the vertical extensions are provided with slots for inserting the lower housing I and the lower housing II; When the top of the lower housing I is horizontally inserted into the bottom slot of the upper housing I, the first mating part I abuts against the vertical extension on the corresponding side; When the top of the lower housing II is horizontally inserted into the bottom slot of the upper housing II, the first mating part II abuts against the vertical extension on the corresponding side.

6. The assembly method according to claim 1, characterized in that, Before attaching the upper housing I, first install the decorative piece and the observation window at the mounting opening of the upper housing I. First, install the observation window to the inside of the decorative piece, with the observation window protruding from the central opening area of ​​the decorative piece. Then, install the decorative piece to the mounting opening of the upper housing I from the outside in.

7. The assembly method according to claim 1, characterized in that, The top shell assembly includes a decorative element, a date dial, and a viewing window, which is installed at the central mounting opening of the date dial; When installing the top shell assembly, first fasten the decorative piece to the top of the upper shell, and then install the assembly consisting of the date dial and the viewing window. The assembly is fastened to the top of the upper shell and is located in the central opening area of ​​the date dial.

8. The assembly method according to claim 1, characterized in that, The top shell assembly includes a decorative element, a date dial, and a viewing window, which is installed at the central mounting opening of the date dial; When installing the top shell assembly, first install the assembly consisting of the date dial and the viewing window, and fasten the assembly to the top of the upper shell. Then fasten the decorative piece to the top of the upper shell. The assembly is located in the central opening area of ​​the date dial.

9. The assembly method according to claim 7 or 8, characterized in that, The top of the upper housing is provided with a mounting groove, and the bottom of the mounting groove is provided with a snap-fit ​​interface. The mounting groove extends circumferentially along the upper housing. The decorative piece has a snap-fit ​​part, a first limiting part, and a second limiting part on the side facing the mounting groove. When the decorative piece is installed, the first limiting part is inserted into the mounting groove along the outer circumferential wall of the mounting groove, and the insertion stops when the second limiting part abuts against the bottom of the mounting groove. The snap-fit ​​part snaps into the snap-fit ​​interface, and the decorative piece covers the top opening of the mounting groove.

10. The assembly method according to claim 7 or 8, characterized in that, The date wheel is provided with a first extension rib, which extends circumferentially along the date wheel. The first extension rib is provided with a downwardly extending extension rib, and the extension rib is provided with an elastic arm. The elastic arm extends upward from the extension rib, and the first extension rib and the extension rib are provided with a notch to make way for the elastic arm. When the date turntable is installed into the top mounting port of the upper housing, the extension rib undergoes elastic deformation to guide the first extension rib downward into the mounting port, and the protruding structure on the elastic arm is adapted to the recessed structure on the inner peripheral wall of the mounting port.

Images