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; horizontally inserting the top of a lower shell I into the bottom slot of the upper shell I, horizontally inserting the top of a 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 allowing the lower shell to rotate relative to the upper shell; and installing a top shell assembly on the top of the upper shell. The method is convenient for installing the internal filter core and simplifies the processing of the shell.

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 water supply in the whole house. It can filter out sediment, rust, algae and other large particulate impurities in 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 existing technology, the lower housing is a one-piece hollow cylindrical structure with a limiting cavity inside. The drain valve body at the bottom is inserted into the hollow cylindrical structure of the lower housing from top to bottom and is limited within the limiting cavity. The lower housing has a complex structure, is difficult to manufacture, and makes it difficult to align the drain valve body into the limiting cavity in one go, which is inconvenient for installation.

[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 view of the problems pointed out in the background art, the present invention proposes an assembly method for a pre-filter, which facilitates the installation of the internal filter element and simplifies the processing of the housing.

[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 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.

[0011] A top shell assembly is installed on top of the upper housing.

[0012] In some embodiments, the inner wall of the upper housing II is provided with a foolproof recess, and the filter element is provided with a foolproof part. When the filter element is installed into the space enclosed by the upper housing II, the foolproof part is embedded in the foolproof recess.

[0013] In some embodiments, the inner walls of the lower housing I and the lower housing II are respectively provided with limiting extensions. When the lower housing I and the lower housing II are installed on the upper housing, the bottom drain valve body of the filter element is embedded in the recess of the limiting extension to limit the bottom of the filter element.

[0014] In some embodiments, the inner wall of the upper housing II is provided with a circumferentially extending rib, the two ends of which 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.

[0015] 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.

[0016] In some embodiments, a first mating part I is provided on the inner wall of the lower housing I, and a first mating part II is provided on the inner wall of the lower housing II;

[0017] 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;

[0018] 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;

[0019] 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.

[0020] In some embodiments, before fastening the upper housing I, a decorative element and an observation window are first installed at the mounting opening of the upper housing I. The observation window is first installed to the inside of the decorative element, with the observation window protruding from the central opening area of ​​the decorative element. Then, the decorative element is installed to the mounting opening of the upper housing I from the outside in.

[0021] In some embodiments, the top shell assembly includes a decorative element, a date wheel, and a viewing window mounted at the center of the date wheel;

[0022] 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.

[0023] In some embodiments, the top shell assembly includes a decorative element, a date wheel, and a viewing window mounted at the center of the date wheel;

[0024] 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.

[0025] In some embodiments, the top of the upper housing is provided with a mounting groove, the bottom of the mounting groove is provided with a card interface, and the mounting groove extends circumferentially along the upper housing;

[0026] 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.

[0027] In some embodiments, the date wheel is provided with a first extension rib extending circumferentially along the date wheel, the first extension rib is provided with a downwardly extending extension rib, the extension rib is provided with an elastic arm extending upward from the extension rib, and the first extension rib and the extension rib are provided with a notch to accommodate the elastic arm.

[0028] 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.

[0029] Compared with the prior art, the advantages and positive effects of the present invention are:

[0030] 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.

[0031] 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

[0032] 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.

[0033] Figure 1 This is a schematic diagram of the structure of a pre-filter according to an embodiment;

[0034] Figure 2 This is a schematic diagram of the pre-filter according to an embodiment, with one side of the housing omitted.

[0035] Figure 3 An exploded view of the pre-filter according to an embodiment;

[0036] Figure 4 This is a schematic diagram of the upper housing as viewed from the bottom side according to an embodiment;

[0037] Figure 5 This is a schematic diagram of the upper housing I according to an embodiment;

[0038] Figure 6 This is a schematic diagram of the upper housing II according to an embodiment;

[0039] Figure 7 This is a schematic diagram of the lower housing according to an embodiment;

[0040] Figure 8 This is a schematic diagram of the lower housing I according to an embodiment;

[0041] Figure 9 This is a schematic diagram of the lower housing II according to an embodiment;

[0042] Figure 10 This is a schematic diagram of the structure after the upper housing II and the lower housing II are inserted according to the embodiment;

[0043] Figure 11 for Figure 10 Enlarged view of section A in the middle;

[0044] Figure 12 This is a schematic diagram of the lower housing I as viewed from the inside according to an embodiment;

[0045] Figure 13 This is a schematic diagram of the assembly structure of the front viewing window and the front trim piece according to an embodiment;

[0046] Figure 14 This is a schematic diagram of the structure of the front viewing window according to an embodiment;

[0047] Figure 15 This is a schematic diagram of the structure of the front decorative element according to an embodiment;

[0048] Figure 16 This is a cross-sectional view of the top shell assembly assembled on the housing according to an embodiment;

[0049] Figure 17 This is a top view of the top housing assembly of the pre-filter according to an embodiment;

[0050] Figure 18 This is a structural view of the upper housing according to an embodiment;

[0051] Figure 19 This is a schematic diagram of the assembly structure of the turntable and the top observation window according to an embodiment;

[0052] Figure 20 This is a schematic diagram of the turntable according to an embodiment;

[0053] Figure 21 This is a schematic diagram of the top viewing window according to an embodiment;

[0054] Figure 22 This is a structural schematic diagram of the top decorative element according to an embodiment;

[0055] Figure label:

[0056] 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; 118. Anti-foolproof recess; 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;

[0057] 200. Lower shell; 210. Lower shell I; 220. Lower shell II; 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; 270. Limiting extension part; 271. Notch part; 272. Reinforcing rib;

[0058] 300. Filter element; 310. Filter element body; 320. Drain valve body; 330. Inlet; 340. Outlet; 350. Pressure gauge; 360. Filter element anti-foolproof part;

[0059] 400. Front observation window; 410. Second raised rib; 411. Second snap-fit ​​part; 412. Protrusion part;

[0060] 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;

[0061] 600. Knob section;

[0062] 700. Top observation window; 710. Observation window body; 720. Flanged edge; 721. Flanged edge locking part; 722. Protrusion;

[0063] 800. Top decorative element; 810. Snap-fit ​​part; 820. First limiting part; 830. Second limiting part; 840. Indicating part; 850. Opening;

[0064] 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. Detailed Implementation

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] This embodiment discloses a 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.

[0072] Reference Figures 1 to 3 The pre-filter includes a housing, within which an installation space is formed for installing the filter element 300.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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 700 includes an observation window (denoted as top observation window 700), a turntable 900, and a decorative element (denoted as top decorative element 800).

[0077] Structural reference of upper shell 100 Figures 4 to 6The 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. The bottom of the upper housing 100 is provided with an upper insertion part, which extends circumferentially along the upper housing 100.

[0078] Structural reference of lower housing 200 Figures 7 to 9 The lower housing 200 includes a lower housing I 210 and a lower housing II 220. The lower housing I 210 and the lower housing II 220 are joined together to form a lower mounting cavity for installing the filter element 300. The top of the lower housing 200 is provided with a lower insertion part, which extends circumferentially along the lower housing 200.

[0079] The upper and lower insertion parts are inserted into each other to connect the upper housing 100 and the lower housing 200. When the lower housing 200 rotates relative to the upper housing 100, the lower insertion part rotates along the upper insertion part.

[0080] 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.

[0081] In some embodiments, the upper insertion portion is a slot 130, the opening of which faces outward, as shown in the reference. Figure 4 The lower insertion part is a 230 insertion rib, see reference. Figure 7 The insert rib 230 is inserted into the slot 130, as shown in the reference. Figure 10 and Figure 11 .

[0082] 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.

[0083] 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.

[0084] In one specific embodiment, the bottom of the upper housing I110 is provided with a slot I131, which extends circumferentially along the upper housing I110, and the bottom of the upper housing II120 is provided with a slot II132, which extends circumferentially along the upper housing II120.

[0085] The bottom of the lower shell I 210 is provided with a connecting rib I 231, which extends circumferentially along the lower shell I 210. The bottom of the lower shell II 220 is provided with a connecting rib II 232, which extends circumferentially along the lower shell II 220.

[0086] 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.

[0087] 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.

[0088] Specifically, refer to Figure 5 and Figure 6 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.

[0089] Similarly, refer to Figure 8 and Figure 9 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.

[0090] In some embodiments, refer to Figure 5 and Figure 6 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.

[0091] 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.

[0092] Furthermore, in combination Figure 2The 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.

[0093] In some embodiments, refer to Figure 5 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 6 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 4 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.

[0094] In some embodiments, refer to Figure 4 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.

[0095] In some embodiments, refer to Figure 8 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.

[0096] Reference Figure 9 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.

[0097] Reference Figure 4 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] In this specific embodiment, refer to Figure 6 and Figure 11 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.

[0103] 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.

[0104] In this specific embodiment, refer to Figure 9 The inner wall of the lower shell II220 is provided with a lower circumferential extension rib 260. Its specific function is not described in detail, but is the same as that of the upper circumferential extension rib 160.

[0105] In some embodiments, the fit between the lower housing 200 and the filter element 300 is described with reference to... Figure 2 , Figure 8 ,as well as Figure 9 The lower housing I 210 and the lower housing II 220 are respectively provided with limiting extensions 270, and the two limiting extensions 270 form a limiting opening. The drain valve body 320 is located in the limiting opening, and the shape of the limiting opening is adapted to the irregular outer contour of the drain valve body 320.

[0106] When the lower housing 200 rotates, the lower housing 200 drives the drain valve body 320 to rotate synchronously through the cooperation between the limiting port and the drain valve body 320. This, 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 housing. Using a scraper to scrape the inner wall of the filter element 300 outer housing is existing technology; its specific structural details and principles will not be elaborated upon in this article.

[0107] As a single component, when assembling the pre-filter, the filter element 300 is first fastened to the front and rear sides of the upper part of the filter element 300, respectively; then the lower housing 1210 is horizontally inserted into the upper housing 100, and the limiting extension 270 on this side simultaneously engages with one side of the drain valve body 320; the lower housing 220 is horizontally inserted into the upper housing 2120, and the limiting extension 270 on this side simultaneously engages with the other side of the drain valve body 320; the lower housing 1210 and the lower housing 220 are snapped together, and the drain valve body 320 is confined within the limiting opening formed by the two limiting extensions 270.

[0108] After the four half-shells are snapped onto the filter element 300, the installation of the filter element 300 is completed. There is no need to process complex structures on the shells for limiting or positioning the filter element 300, which facilitates installation and shell processing.

[0109] In some embodiments, the limiting extension 270 extends in a horizontal direction, and the end of the limiting extension 270 is provided with a notch 271. The notches 271 on the two limiting extensions 270 face each other to form a limiting opening.

[0110] The outer contour of the drain valve body 320 is hexagonal. Correspondingly, the notch 271 of each limiting extension 270 is a three-sided structure. When two limiting extensions 270 are aligned front to back, they can form a hexagonal limiting opening.

[0111] In some embodiments, the limiting extension 270 is provided with reinforcing ribs 272 to improve structural strength.

[0112] In some embodiments, the lower housing I210 is provided with a knob 600 for draining water, and the knob 600 is connected to the drain valve body 320.

[0113] The pre-filter is manual. When drainage is required, manually turn the knob 600 to open the drain valve 320 and drain water from the bottom of the pre-filter.

[0114] In some embodiments, the upper housing I110 is provided with an observation window (referred to as the front observation window 400), which is directly opposite the filter element body 310. The outer shell of the filter element body 310 is a transparent structure, and a scraper is used to scrape and clean the inner wall of the outer shell. The condition of the outer shell of the filter element body 310 is observed through the front observation window 400.

[0115] The front observation window 400 and the knob 600 are located on the same side, allowing the user to perform drainage operations and observations from one side.

[0116] In some embodiments, the specific structure of the front observation window 400 is described in reference to... Figures 12 to 15 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.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] In some embodiments, refer to Figure 15The first protruding rib 520 is provided with multiple spaced-apart first engaging portions 521. (Refer to...) Figure 15 The circumferential side edge of the front observation window 400 has a second protruding rib 410 on the side facing the installation space, and the second protruding rib 410 has a second snap-fit ​​portion 411. Combined with... Figure 13 The second snap-fit ​​part 411 snaps into the first snap-fit ​​part 521, thereby achieving the snap-fit ​​fixation between the front observation window 400 and the front decorative part 500.

[0121] 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.

[0122] 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.

[0123] In some embodiments, refer to Figure 13 and Figure 14 The second protruding rib 410 is provided with a bulge 412, which abuts against the first protruding rib 520.

[0124] 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.

[0125] 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.

[0126] In some embodiments, refer to Figure 12 and Figure 15 The 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.

[0127] 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.

[0128] 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.

[0129] In some embodiments, refer to Figures 16 to 18 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.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] Reference Figure 17 The turntable 900 has multiple date scales 940, which are arranged at intervals along the circumference of the turntable 900. Figure 17 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.

[0134] 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 17 In the middle, the indicator part 840 is provided on the top decorative part 800 on the top of the upper housing 110.

[0135] 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.

[0136] 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.

[0137] In some embodiments, the structure of turntable 900 is referenced. Figure 20 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.

[0138] In reference Figure 18 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.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] In some embodiments, the first snap-fit ​​portion 924 of the turntable is a convex strip structure extending along the first extending rib 920.

[0143] In some embodiments, refer to Figure 18 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 20 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] In some embodiments, refer to Figure 20 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.

[0148] When installing the turntable 900, 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] In some embodiments, continue to refer to Figure 20 The 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.

[0153] Reference Figure 21The 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.

[0154] 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 20 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.

[0155] In some embodiments, refer to Figure 20 Multiple insertion slots 932 are provided at intervals on the second extension rib 930, and then refer to Figure 21 A protrusion 722 is provided on the flange 720, and the protrusion 722 is inserted into the socket 932.

[0156] 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.

[0157] 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.

[0158] In some embodiments, the mounting structure of the top decorative element 800 refers to... Figure 16 The structure of the top decorative element 800 is referenced. Figure 22The 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.

[0159] 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.

[0160] 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.

[0161] In some embodiments, refer to Figure 7 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.

[0162] Refer to Figure 22 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.

[0163] 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.

[0164] 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.

[0165] In some embodiments, refer to Figure 22 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.

[0166] 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.

[0167] 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.

[0168] 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.

[0169] 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.

[0170] In some embodiments, the assembly method of the pre-filter is as follows:

[0171] 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 110. The lower part of the filter element 300 is exposed from the bottom of the upper housing 110.

[0172] The top of the lower housing I 210 is horizontally inserted into the bottom slot (specifically slot I 131) of the upper housing I 110, and the top of the lower housing II 220 is horizontally inserted into the bottom slot (specifically slot II 132) 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.

[0173] Finally, the top shell assembly is installed on top of the upper shell 100.

[0174] In some embodiments, the inner wall of the upper housing II 120 is provided with a foolproof recess 118, and the filter element 300 is provided with a filter element foolproof part 360. When the filter element 300 is installed in the space enclosed by the upper housing II 120, the filter element foolproof part 360 is embedded in the foolproof recess 118.

[0175] In some embodiments, the inner walls of the lower housing I 210 and the lower housing II 220 are respectively provided with limiting extensions 270. When the lower housing I 210 and the lower housing II 220 are installed on the upper housing 100, the bottom drain valve body 320 of the filter element 300 is embedded in the recess 271 of the limiting extension 270 to limit the bottom of the filter element 300.

[0176] 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.

[0177] 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.

[0178] 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;

[0179] 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.

[0180] 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.

[0181] 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.

[0182] In some embodiments, before fastening the upper housing I120, the front decorative piece 500 and the front viewing window 400 are first installed at the mounting opening of the upper housing I120. 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.

[0183] 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.

[0184] 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.

[0185] In some embodiments, the top of the upper housing 10 is provided with a mounting groove 117, the bottom 1172 of the mounting groove 117 is provided with a card interface 1173, and the mounting groove 117 extends circumferentially along the upper housing 100.

[0186] 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 the decorative piece 800 is installed, the first limiting part 820 is inserted into the mounting groove 117 along the outer circumferential wall 1171 of the mounting groove 117. When the second limiting part 830 abuts against the bottom 1172 of the mounting groove 117, the insertion stop is reached. The snap-fit ​​part 810 snaps into the snap-fit ​​interface 1173. The top decorative piece 800 covers the top opening of the mounting groove 117.

[0187] 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.

[0188] 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.

[0189] 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.

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

2. The assembly method according to claim 1, characterized in that, The inner wall of the upper housing II is provided with a foolproof recess, and the filter element is provided with a foolproof part. When the filter element is installed into the space enclosed by the upper housing II, the foolproof part is embedded in the foolproof recess.

3. The assembly method according to claim 1, characterized in that, The lower housing I and the lower housing II are respectively provided with limiting extensions on their inner walls. When the lower housing I and the lower housing II are installed on the upper housing, the bottom drain valve body of the filter element is embedded in the recess of the limiting extension to limit the bottom of the filter element.

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, 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.

6. 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.

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 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.

8. The assembly method according to claim 6 or 7, 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.

9. The assembly method according to claim 6 or 7, 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