Building water supply pretreatment device with filtering function

Abstract

The utility model provides a kind of building life water supply pretreatment device with filtering function, it is related to building water supply processing technical field, and it includes: base, the upper end of base is installed one series connection pipe, two sides of series connection pipe are equipped with one bottom positioning shell respectively, the upper end of bottom positioning shell is installed one filter respectively, the upper end of filter is installed with first top positioning shell and second top shell, the side of first top positioning shell is equipped with one first docking sleeve. Two filters are distributed left and right and form parallel passage by series connection pipe, can be switched filter mode flexibly according to actual water demand, when one of filter needs maintenance, another can continue to run, without interrupting building life water supply, meet water continuity requirement;And the setting of double filter can disperse filtration load, prolong the service life of single filter, reduce the frequency of frequent maintenance, reduce use cost.

Description

Technical Field

[0001] This utility model relates to the field of building water supply treatment technology, and in particular to a building domestic water supply pretreatment device with filtration function. Background Technology

[0002] In building water supply systems, to ensure water quality, pretreatment devices are typically installed to filter raw water, removing impurities, suspended solids, and other contaminants to provide clean water for subsequent water use. However, current building water supply pretreatment devices still have several issues that require improvement in practical applications, as detailed below: Traditional pretreatment devices often use multiple filters in parallel. When the filters need to be cleaned or replaced, the entire pretreatment device must be stopped, which leads to the interruption of the building's domestic water supply and affects the device's ability to quickly resume operation. In addition, the valves are basically rigidly connected and lack the ability to compensate for displacement, which increases the workload of operators, prolongs maintenance time, and reduces the overall water supply efficiency. During the operation of the equipment, the pipeline will undergo thermal expansion and contraction or vibration displacement due to changes in ambient temperature and vibration pump vibration. Rigid connections cannot adapt to such displacement changes, which can easily cause pipeline interface leakage and pipeline cracking damage. This not only affects the normal operation of the equipment, but also requires frequent pipeline maintenance, increasing the later maintenance costs and workload. Utility Model Content

[0003] This utility model relates to a pretreatment device for building domestic water supply with filtration function. The base is firmly fixed by bolt mounting holes, providing stable support for the device and preventing displacement and shaking during operation, thus ensuring overall operational stability. The dual filters form a parallel path through a series pipe, allowing for flexible switching of filtration modes. Maintenance can be performed without interrupting the water supply, ensuring continuous water use. At the same time, the filtration load is distributed, extending the filter life and reducing maintenance frequency and cost. In the sealing structure, the support spring pushes the sealing disc to automatically seal the shell opening, eliminating the need for manual operation, simplifying the process, ensuring a seal, and preventing unfiltered water from mixing in. The extension rod cooperates with the lifting sleeve to facilitate manual control of the sealing disc, improving operational convenience. The corrugated pipe of the flow-limiting structure can adapt to pipeline displacement caused by temperature changes and vibration, avoiding damage to rigid connections. The support spring maintains the shape of the corrugated pipe and facilitates valve disassembly and assembly, improving maintenance efficiency and reducing pipeline repair costs.

[0004] This utility model provides a pretreatment device for building domestic water supply with filtration function, specifically including: a base, a series pipe installed at the upper end of the base, a bottom positioning shell respectively on both sides of the series pipe, a filter installed at the upper end of the bottom positioning shell, a first top positioning shell and a second top shell installed at the upper end of the filter, a first docking sleeve on one side of the first top positioning shell, a discharge sleeve on the other side of the first docking sleeve, a second docking sleeve on one side of the second top shell, a threaded pipe on the other side of the second top shell, a valve installed on one side of the first docking sleeve and the threaded pipe, a discharge hole opened on one side of one of the bottom positioning shells, a sealing cap installed on one side of the discharge hole, a bellows installed on one side of the valve, a water inlet pipe installed on one side of one of the bellows, and a sealing disc installed on the inner side of the bottom positioning shell, the first top positioning shell, and the second top shell.

[0005] Furthermore, the first top positioning shell, the first docking sleeve, and the discharge sleeve are interconnected, the second top shell, the second docking sleeve, and the threaded pipe are interconnected, and the bottom positioning shell and the series pipe are internally interconnected. The bottom positioning shell, the series pipe, the filter, the first top positioning shell, the first docking sleeve, the discharge sleeve, the second top shell, the second docking sleeve, and the threaded pipe cooperate with each other to form a pretreatment structure.

[0006] Furthermore, a threaded hole is opened at the bottom of the bottom positioning housing and at the top of the first top positioning housing and the second top housing, and a threaded locking bolt is inserted into the inside of each threaded hole.

[0007] Furthermore, a connecting seat is installed on one side of the valve, and the connecting seat has an internal thread. The first mating sleeve and the threaded pipe each have an internal thread on one side, and the valve has an external thread on both sides. The internal thread and the external thread are threaded together.

[0008] Furthermore, one side of the connecting seat is provided with a set of threaded rods arranged in a ring array. The threaded rods are cylindrical. A bellows is installed on one side of the connecting seat, and a flange is installed on the other side of the bellows. A flange is provided on one side of the second mating sleeve and the water inlet pipe. The threaded rods pass through the inside of the flanges in sequence. A positioning nut and a support spring are installed on the outside of the threaded rods. The support spring is located between the connecting seat and the flange. The valve, connecting seat, threaded rods, and bellows cooperate with each other to form a flow-limiting structure.

[0009] Furthermore, there are two filters, one on the left and one on the right. A set of bolt mounting holes is opened on the periphery of the sealing cover, and another set of bolt mounting holes is opened at the corner of the base. The sealing cover is installed at the discharge hole of the right filter.

[0010] Furthermore, an annular groove is formed at the bottom of the sealing disc, a sealing ring is installed inside the annular groove, a vertical extension rod is provided at the upper end of the sealing disc, and a lifting sleeve is installed on the outer side of the extension rod. The locking bolt, sealing disc, extension rod, and lifting sleeve cooperate with each other to form a sealing structure.

[0011] Furthermore, a support spring is installed on the outer side of the extension rod, and the support spring is located at the upper end of the sealing disc.

[0012] Furthermore, a locking hole is provided at the bottom of the extension rod.

[0013] This utility model provides a pretreatment device for building domestic water supply with filtration function, which has the following beneficial effects: In this utility model, the base is provided with bolt mounting holes in the corners to ensure that the device is securely fixed to the ground or mounting platform, providing a stable support foundation for the entire device.

[0014] Two filters are distributed on the left and right and connected in parallel through a series pipe. The filtration mode can be flexibly switched according to the actual water demand. When one filter needs maintenance, the other can continue to operate without interrupting the building's domestic water supply, thus meeting the requirement of continuous water use. In addition, the dual filter setup can distribute the filtration load, extend the service life of a single filter, reduce the frequency of maintenance, and lower the cost of use. Specifically, the filter is connected to the bottom positioning housing and the top housing at the top and bottom ends, respectively. The sealing structure is installed inside the housing. When the filter is removed, the support spring in the sealing structure can push the sealing disc to move automatically downward, quickly sealing the opening of the housing without manual sealing, simplifying the operation process. Moreover, the elastic pressing action of the support spring on the sealing disc can ensure that the sealing disc always remains sealed when there is no external force intervention, preventing unfiltered water from entering the outlet and ensuring the quality of the output water.

[0015] Specifically, the combination of the extension rod and the lifting sleeve allows operators to manually control the raising and lowering of the sealing disc without the need for complex tools, thus improving ease of operation.

[0016] The bellows in the flow-limiting structure has expansion and contraction characteristics, which can adapt to pipeline displacement caused by temperature changes and vibration during the installation or operation of the device, avoid stress damage to the pipeline caused by rigid connection, and protect the connection between pipeline and valve. The support spring can maintain the normal shape of the bellows and prevent it from being excessively compressed or stretched. At the same time, the bellows can deform flexibly with the operation when the valve is installed or disassembled, which facilitates the disassembly and maintenance of the valve and improves maintenance efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly described below.

[0018] The accompanying drawings described below are only related to some embodiments of the present invention and are not intended to limit the scope of the present invention.

[0019] In the attached diagram: Figure 1 A schematic diagram of the axle side structure of the pretreatment device of this utility model after assembly is shown; Figure 2 This utility model illustrates Figure 1 A schematic diagram of the axonal structure from the rear view; Figure 3 A schematic diagram of the axial structure of the pretreatment device of this utility model after disassembly is shown; Figure 4 A schematic diagram of the axial side structure of the pretreatment device of this utility model is shown. Figure 5 A schematic diagram of a partial axial side structure of the pretreatment device of this utility model after sectional cutting is shown; Figure 6 This utility model illustrates Figure 5 A schematic diagram of a partial axial side structure; Figure 7 This utility model illustrates Figure 5 Front view structural diagram; Figure 8 This utility model illustrates Figure 5 A magnified structural diagram at point A.

[0020] List of reference numerals 1. Base; 2. Pretreatment structure; 201. Bottom positioning housing; 202. Series pipe; 203. Filter; 204. First top positioning housing; 205. First docking sleeve; 206. Discharge sleeve; 207. Second top housing; 208. Second docking sleeve; 209. Threaded pipe; 3. Flow-limiting structure; 301. Valve; 302. Connecting seat; 303. Threaded rod; 304. Bellows; 4. Sealing cap; 5. Water inlet pipe; 6. Sealing structure; 601. Locking bolt; 602. Sealing disc; 603. Extension rod; 604. Lifting sleeve. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the described embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] Example 1: Please refer to Figures 1 to 8 : This utility model proposes a pretreatment device for building domestic water supply with filtration function, comprising: a base 1, a series pipe 202 installed on the upper end of the base 1, a bottom positioning shell 201 respectively on both sides of the series pipe 202, a filter 203 respectively installed on the upper end of the bottom positioning shell 201, a first top positioning shell 204 and a second top shell 207 installed on the upper end of the filter 203, a first docking sleeve 205 is provided on one side of the first top positioning shell 204, and a discharge sleeve 206 is provided on the other side of the first docking sleeve 205, a second docking sleeve 208 is provided on one side of the second top shell 207, and a threaded pipe 209 is provided on the other side of the second top shell 207, the first top positioning shell 204, the first docking sleeve 205 and the discharge sleeve 206 are interconnected, and the second top shell 207... The second docking sleeve 208 and the threaded pipe 209 are interconnected, and the bottom positioning shell 201 and the series pipe 202 are internally connected. The series pipe 202 connects the two bottom positioning shells 201 in series. The bottom positioning shell 201, the series pipe 202, the filter 203, the first top positioning shell 204, the first docking sleeve 205, the discharge sleeve 206, the second top shell 207, the second docking sleeve 208, and the threaded pipe 209 cooperate to form the pretreatment structure 2. Specifically, it realizes the orderly flow of domestic water in the device. The two filters 203 are connected in parallel through the series pipe 202. The single or dual filtration mode can be switched according to the water quality or filtration needs. At the same time, the structural design of each connected component ensures that the water flow has no dead corners, avoids pipe blockage caused by impurities, and improves the pretreatment efficiency and water purification effect. In this embodiment, a connecting seat 302 is installed on one side of the valve 301. The connecting seat 302 has an internal thread. An internal thread is also formed on one side of the first mating sleeve 205 and the threaded tube 209, and an external thread is formed on both sides of the valve 301. The thread pitch is machined according to actual needs. The internal and external threads are connected. Specifically, through the precise fit of the internal and external threads, a detachable and stable connection is achieved between the valve 301 and the connecting seat 302, the first mating sleeve 205, and the threaded tube 209, which not only facilitates… The installation, maintenance, and replacement of valve 301 can also prevent water leakage at the connection point through the sealing characteristics of the threaded connection. At the same time, the uniform thread pitch design ensures the universality and interchangeability of the connections of various components, reducing later maintenance costs. One side of the connecting seat 302 is provided with a set of threaded rods 303 distributed in a ring array. The threaded rods 303 are cylindrical structures. The bellows 304 is installed on one side of the connecting seat 302, and a flange is installed on the other side of the bellows 304. A flange is provided on one side of the second mating sleeve 208 and the water inlet pipe 5 respectively. The valve 301, threaded rod 303, and bellows 304 are connected and interlocked. A locating nut and a support spring are installed on the outer side of the threaded rod 303. The spring force is selected according to actual needs to ensure stable support of the bellows 304 as it returns to its original position. The support spring is located between the connecting seat 302 and the flange. The valve 301, connecting seat 302, threaded rod 303, and bellows 304 work together to form the flow-limiting structure 3. Specifically, the valve 301 allows for precise control of the water flow, and the bellows 304 has a certain degree of flexibility. It can compensate for pipeline displacement caused by temperature changes and vibration during the installation or operation of the device and valve 301; the threaded rod 303 of the annular array and the positioning nut ensure the stable connection of the bellows 304, while the support spring can maintain the normal shape of the bellows 304. When the valve 301 is installed or removed, the bellows 304 can be compressed and changed direction. After the valve 301 is installed or removed, the bellows 304 can be reset under the support of the spring, so as to achieve the effect of convenient installation or removal of the valve 301, while ensuring the long-term stable operation of the flow limiting structure 3. In this embodiment, a valve 301 is installed on one side of the first mating sleeve 205 and the threaded pipe 209, respectively. A discharge hole is opened on one side of one of the bottom positioning housings 201, and a sealing cap 4 is installed on one side of the discharge hole. There are two filters 203, distributed left and right. A set of bolt mounting holes is opened on the periphery of the sealing cap 4, and another set of bolt mounting holes is opened at the corner of the base 1. The sealing cap 4 is installed at the discharge hole of the right filter 203. Specifically, the two left and right distributed filters 203 form a parallel filtration system. When one filter 203 needs... When cleaning or replacing the filter media, the corresponding passage can be closed and another filter 203 can be activated to ensure uninterrupted water supply and meet the continuous water supply needs of the building. The sealing cover 4 seals the discharge hole of the right-side filter 203 through the bolt mounting hole and bolt engagement, preventing water leakage from the discharge hole during filtration. Removing the sealing cover 4 allows for easy removal of impurities or wastewater from the filter 203, facilitating maintenance and cleaning. After removing the right-side filter 203, remove the sealing cover 4. The discharge hole corresponding to the sealing cover 4 connects to the domestic water supply pipe. The bolts at the corner of the base 1... The mounting holes facilitate fixing the entire device to the ground or mounting platform, improving the stability of the device during operation and preventing displacement due to water flow impact or vibration. A bellows 304 is installed on one side of each valve 301, with an inlet pipe 5 installed on one side of one of the bellows 304. A sealing disc 602 is installed on the inner side of each of the bottom positioning housing 201, the first top positioning housing 204, and the second top housing 207. A threaded hole is formed at the bottom of the bottom positioning housing 201 and at the top of each of the first top positioning housing 204 and the second top housing 207. Each of the internal components has a threaded locking bolt 601 inserted. The thread pitch is machined according to actual needs to ensure precise thread connection between the threaded hole and the locking bolt 601. Specifically, the precise thread engagement between the threaded hole and the locking bolt 601 enables stable installation and position adjustment of the locking bolt 601 on the housing. This provides a reliable locking support point for the sealing structure 6, ensuring the stability of the sealing or opening state of the sealing structure 6 to the housing opening. Furthermore, the self-locking characteristic of the thread prevents the locking bolt 601 from loosening due to vibration during device operation, thus ensuring the stability and sealing of the overall structure of the device. In this embodiment, an annular groove is formed at the bottom of the sealing disc 602, and a sealing ring is installed inside the annular groove. A vertical extension rod 603 is provided at the upper end of the sealing disc 602, and a lifting sleeve 604 is installed on the outer side of the extension rod 603. The locking bolt 601, the sealing disc 602, the extension rod 603, and the lifting sleeve 604 cooperate to form the sealing structure 6. Specifically, the sealing ring at the bottom of the sealing disc 602 can enhance the sealing performance of its contact part with the housing, preventing water leakage from the sealing point; the extension rod 603 cooperates with the lifting sleeve 604 to facilitate the operator to lift the sealing disc 602 upwards, realizing the opening and closing of the housing opening when replacing the filter 203; the locking bolt 601 The sealing disc 602 can be locked after being pulled to the designated position to prevent it from falling due to gravity or water pressure, ensuring safety and convenience during operation. The overall sealing structure 6 enables flexible opening and reliable sealing of the housing opening, providing a guarantee for the maintenance of the filter 203 and the normal operation of the device. A support spring is installed on the outer side of the extension rod 603, located at the upper end of the sealing disc 602. The support spring presses the sealing disc 602 downward and elastically stabilizes it. After removing one of the filters 203, the sealing disc 602 moves downward and cooperates with the sealing ring to seal the bottom of the first top positioning housing 204 or the second top housing 207, allowing the other filter 203 to continue to operate. Continuing to filter domestic water, the specific function is that the support spring, by pressing down on the sealing disc 602, ensures that the sealing disc 602 remains tightly fitted to the bottom of the housing when no external force is applied, maintaining the seal after the filter 203 is removed. When one of the filters 203 is removed, the elastic force of the support spring pushes the sealing disc 602 downward, working with the sealing ring to quickly seal the bottom opening of the corresponding housing, effectively blocking the water flow in that passage and ensuring normal water supply to the passage containing the other filter 203. This allows for rapid maintenance of the device and ensures the continuity of the building's domestic water supply. A locking hole is provided at the bottom of the extension rod 603. When the sealing disc 602, extension rod 603, and lifting sleeve 604 are pulled upward, the locking hole is engaged. The locking bolt 601 is moved so that one side of the locking bolt 601 extends into the locking hole. Specifically, after the filter 203 is installed, the sealing disc 602 is pulled upward to the designated position, and the locking bolt 601 is turned into the locking hole of the extension rod 603. The extension rod 603 is limited and fixed by the locking bolt 601, thereby maintaining the open state of the sealing disc 602. This eliminates the need for continuous pulling by the operator, freeing up manpower and allowing the operator to focus on the installation or replacement of the filter 203, improving the convenience and safety of maintenance operations. At the same time, the cooperation between the locking hole and the locking bolt 601 ensures that the sealing disc 602 is stable in the open state, preventing the sealing disc 602 from falling due to accidental contact and affecting operation.

[0023] Example 2, based on Example 1, such as Figures 1-7As shown, a conventional water pump needs to be installed and connected to the inlet pipe 5 so that the water pump can effectively supply water to the pretreatment device.

[0024] The working principle of this embodiment: Through the bolt mounting holes at the corner of the base 1, the entire pretreatment device is fixed to the ground or a designated installation platform using bolts. The bottom positioning housing 201 is sealed and fitted with the series pipe 202. The filter 203 is installed between the bottom positioning housing 201 and the first top positioning housing 204 and the second top housing 207. The sealing cover 4 is installed at the discharge hole of the right filter 203 by bolts and the bolts are tightened. Connect the outlet of the conventional water pump to the inlet pipe 5, and the inlet pipe 5 is connected to the corresponding valve 301 through the corrugated pipe 304; connect the discharge sleeve 206 to the water supply end of the building or the subsequent treatment equipment through the pipeline to complete the construction of the entire water supply channel. For the sealing structures 6 corresponding to the two filters 203, pull the lifting sleeve 604 upwards, causing the extension rod 603 and the sealing disc 602 to rise until the sealing disc 602 disengages from the inner sealing surface of the bottom positioning housing 201, the first top positioning housing 204, or the second top housing 207; rotate the locking bolt 601 so that one side of the locking bolt 601 extends into the locking hole at the bottom of the extension rod 603, fixing the sealing disc 602 in the open state; open the valve 301 on the threaded pipe 209 side and close the valve 301 on the first docking sleeve 205 side. Slowly turn on the water pump so that domestic water enters the pretreatment structure 2 through the inlet pipe 5, corrugated pipe 304, and valve 301; Open the sealing cap 4 at the discharge port of the filter 203 on the right side. After the water flowing out of the discharge port is free of air bubbles, close the sealing cap 4 and tighten the bolts again to complete the discharge of air in the pipeline and avoid air retention that may affect the filtration efficiency or cause pipeline vibration. Keep the valves 301 corresponding to the two filters 203 in the open state. After the domestic water is diverted through the inlet pipe 5, it enters the two filters 203 for filtration. The filtered water is collected through the first docking sleeve 205 and the discharge sleeve 206 and transported to the water-using end to improve the overall filtration efficiency. The valve 301 corresponding to one of the filters 203 can be closed, and domestic water is filtered only through a single filter 203. During operation, the water supply flow is adjusted by valve 301 to avoid excessive flow causing filter 203 to be overloaded, thus ensuring stable filtration effect. Observe the water pump's operating status to ensure stable water supply pressure; if a significant decrease in water flow rate or insufficient water pressure is observed at the water outlet, it indicates that the filter media 203 is clogged and maintenance is required. When it is determined that one of the filters 203 is blocked, the valve 301 corresponding to the filter 203 is closed to cut off its inlet and outlet water passages; the locking bolt 601 of the corresponding sealing structure 6 is rotated to disengage it from the locking hole of the extension rod 603. Under the elastic force of the support spring, the sealing disc 602 moves downward and, together with the sealing ring, seals the inside of the bottom positioning housing 201, the first top positioning housing 204 or the second top housing 207, thereby completely isolating the blocked filter 203. At this time, the other filter 203 continues to operate normally to ensure uninterrupted domestic water supply to the building. Remove the connection structure between the upper and lower ends of the clogged filter 203 and the bottom positioning housing 201, the first top positioning housing 204 or the second top housing 207, remove the filter 203 from the device, and reinstall the cleaned or new filter 203. Pull the lifting sleeve 604 upwards to raise the sealing disc 602 and fix it in the open position by the locking bolt 601; slowly open the valve 301 corresponding to the filter 203. When the filter 203 on the right is removed, open the sealing cover 4 at the discharge port of the filter 203 on the right and connect the discharge port of the filter 203 on the right and connect it to the water supply terminal of the building's domestic water supply or subsequent treatment equipment through the pipeline. At this time, the filter 203 on the left continues to pre-treat the building's domestic water.

Claims

1. A pretreatment device for building domestic water supply with filtration function, characterized in that, include: The base (1), bottom positioning housing (201), and bellows (304) are provided. A series pipe (202) is installed on the upper end of the base (1). A bottom positioning housing (201) is provided on both sides of the series pipe (202). A filter (203) is installed on the upper end of the bottom positioning housing (201). A first top positioning housing (204) and a second top housing (207) are installed on the upper end of the filter (203). A first docking sleeve (205) is provided on one side of the first top positioning housing (204), and a discharge sleeve (206) is provided on the other side of the first docking sleeve (205). A second top housing (207) is provided on one side of the second top housing (207). The second docking sleeve (208) and the second top housing (207) are provided with a threaded pipe (209) on the other side. A valve (301) is installed on one side of the first docking sleeve (205) and the threaded pipe (209). A drain hole is opened on one side of one of the bottom positioning housings (201). A sealing cover (4) is installed on one side of the drain hole. A bellows (304) is installed on one side of the valve (301). A water inlet pipe (5) is installed on one side of one of the bellows (304). A sealing disc (602) is installed on the inner side of the bottom positioning housing (201), the first top positioning housing (204), and the second top housing (207).

2. The pretreatment device for building domestic water supply with filtration function according to claim 1, characterized in that, The first top positioning housing (204), the first docking sleeve (205), and the discharge sleeve (206) are interconnected. The second top housing (207), the second docking sleeve (208), and the threaded pipe (209) are interconnected. The bottom positioning housing (201) and the series pipe (202) are internally interconnected. The bottom positioning housing (201), the series pipe (202), the filter (203), the first top positioning housing (204), the first docking sleeve (205), the discharge sleeve (206), the second top housing (207), the second docking sleeve (208), and the threaded pipe (209) cooperate with each other to form a pretreatment structure (2).

3. A pretreatment device for building domestic water supply with filtration function according to claim 1, characterized in that, A threaded hole is provided at the bottom of the bottom positioning housing (201) and at the top of the first top positioning housing (204) and the second top housing (207), respectively, and a threaded locking bolt (601) is inserted into the threaded hole.

4. A pretreatment device for building domestic water supply with filtration function according to claim 1, characterized in that, A connecting seat (302) is installed on one side of the valve (301). The connecting seat (302) has an internal thread. The first mating sleeve (205) and the threaded pipe (209) each have an internal thread on one side. The valve (301) has an external thread on both sides. The internal thread and the external thread are connected by threads.

5. A pretreatment device for building domestic water supply with filtration function according to claim 4, characterized in that, The connecting seat (302) has a set of threaded rods (303) arranged in a ring array on one side. The threaded rods (303) are cylindrical. The bellows (304) is installed on one side of the connecting seat (302). A flange is installed on the other side of the bellows (304). A flange is provided on one side of the second mating sleeve (208) and the water inlet pipe (5). The threaded rods (303) pass through the inside of the flange in sequence. A positioning nut and a support spring are installed on the outside of the threaded rods (303). The support spring is located between the connecting seat (302) and the flange. The valve (301), the connecting seat (302), the threaded rods (303), and the bellows (304) cooperate with each other to form a flow limiting structure (3).

6. A pretreatment device for building domestic water supply with filtration function according to claim 1, characterized in that, There are two filters (203), which are distributed on the left and right. A set of bolt mounting holes are opened on the periphery of the sealing cover (4), and a set of bolt mounting holes are opened at the corner of the base (1). The sealing cover (4) is installed at the discharge hole of the right filter (203).

7. A pretreatment device for building domestic water supply with filtration function according to claim 1, characterized in that, An annular groove is provided at the bottom of the sealing disc (602), and a sealing ring is installed inside the annular groove. A vertical extension rod (603) is provided at the upper end of the sealing disc (602), and a lifting sleeve (604) is installed on the outer side of the extension rod (603). The locking bolt (601), the sealing disc (602), the extension rod (603), and the lifting sleeve (604) cooperate with each other to form a sealing structure (6).

8. A pretreatment device for building domestic water supply with filtration function according to claim 7, characterized in that, A support spring is installed on the outer side of the extension rod (603), and the support spring is located at the upper end of the sealing disc (602).

9. A pretreatment device for building domestic water supply with filtration function according to claim 7, characterized in that, A locking hole is provided at the bottom of the extension rod (603).

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