Pre-filter with backwashing switching function

Abstract

The utility model provides a pre-filter with a backwashing switching function, and belongs to the technical field of drinking water filtration. The problem that silt and sundries on the surface of an existing filter screen are difficult to wash away is solved. According to the front water purifier, a water inlet and a water outlet are formed in the two sides of a filter bottle respectively, a movable framework is further connected to the interior of the filter bottle, an upper connecting sleeve is further connected to the water outlet, a lower connecting sleeve is further connected to the interior of the filter bottle, the lower connecting sleeve right faces a drain outlet, the upper end of the framework is arranged in the upper connecting sleeve in a sleeved mode, and the lower end of the framework is arranged on the lower connecting sleeve in a sleeved mode. A first water inlet is formed in the upper connecting sleeve, a second water inlet is further formed in the upper portion of the framework, a waterproof hammer stand column is further connected into the framework, a third water inlet is further formed in the framework, a filter screen is further connected to the third water inlet, and the framework is further sleeved with a lamination. And the self-cleaning capability of the front water inlet device can be improved, so that the service life of the filter is greatly prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of drinking water filtration and relates to a pre-filter with backwashing switching. Background Art

[0002] The city's water supply pipelines are old and long. Impurities such as rust, sand and sand in the pipelines will cause the water-using equipment to malfunction, so it is necessary to install filtering devices on the water-using equipment. The pre-filter is the first coarse filtration device for the whole house's water. It can filter sand, rust and large particles in the tap water to prevent the large amount of precipitated impurities produced in the city and community water supply network from causing harm to the human body. It also plays an active pre-protective role for concealed pipes, faucets, water heating, water heaters, boilers, central air conditioners, washing machines, dishwashers, coffee machines and other water appliances (water purifiers, pure water machines, water softeners).

[0003] In the prior art, the filter element of the pre-filter is generally a simple filter screen, and the pre-filter is to discharge sewage and discharge the accumulated impurities from the filter bottle.

[0004] The filter screen during stacking is difficult to rinse clean due to long-term attachment and forgetting to drain the sewage regularly. The mud and debris on the surface of the filter screen will also reduce the water output at the rear end, thus affecting the service life of the filter element and screen. Since the skeleton filter element is cylindrical and the filter screen is set on its surface, the water is transported inward from the circumference of the skeleton filter element after filtration. The filtered water is prone to collision after entering the interior, causing a water hammer effect. Utility Model Content

[0005] The purpose of the utility model is to provide a pre-filter with backwashing switch which has a compact structure and strong stability in view of the above problems existing in the prior art.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A pre-filter with backwash switching comprises a body of the pre-filter with backwash switching, a hollow filter bottle with openings at both ends installed inside the body, a valve head connected to the upper part of the filter bottle, a sewage outlet connected to the lower part, and a water inlet and a water outlet respectively arranged on both sides of the valve head, characterized in that a movable skeleton is also connected to the inside of the filter bottle, an upper connecting sleeve is also connected to the water outlet, a lower connecting sleeve is also connected to the inside of the filter bottle, the lower connecting sleeve is directly opposite to the sewage outlet, the upper end of the skeleton is sleeved inside the upper connecting sleeve, and the lower end is sleeved on the lower connecting sleeve, a first water inlet is provided on the upper part of the skeleton, a second water inlet is also provided on the upper part of the skeleton, a waterproof hammer column is also connected to the inside of the skeleton, a third water inlet is also provided on the skeleton, a filter screen is also connected to the third water inlet, and a laminate is also sleeved on the skeleton.

[0008] A hollow filter bottle is installed inside the water purifier body, a valve head is screwed on the top of the filter bottle, the two sides of the valve head are respectively a water inlet and a water outlet, and a sewage outlet is arranged at the bottom of the filter bottle.

[0009] A frame is installed inside the filter bottle. The upper part of the frame is connected to the water outlet through an upper connecting sleeve, and the lower part of the frame is connected to the inside of the filter bottle through a lower connecting sleeve. The frame can move inside the filter bottle, thereby changing the water flow path and switching between filtration and backwashing.

[0010] When the sewage outlet is closed for filtration, the frame moves upward and the top of the frame rests against the inner wall of the upper connecting sleeve. Water flows from the water inlet to the first water inlet of the upper connecting sleeve, and then flows to the inside of the frame through the laminated sheets and filter screen outside the frame, and then flows from the inside of the frame to the water outlet, thereby filtering the water, so that the water flows from the first water inlet, the third water inlet, the inside of the frame, and the water outlet in sequence.

[0011] During backwashing, the drain outlet is opened, the frame moves downward, and the top of the frame moves downward, so that the first water inlet of the upper connecting sleeve is connected to the second water inlet at the upper part of the frame, and water flows from the water inlet into the first water inlet and the second water inlet, and the water enters the interior of the frame. The water is flushed and filtered from the inside of the frame to the outside, and finally discharged from the drain outlet at the bottom of the filter bottle.

[0012] A water hammer prevention column is also connected to the inside of the frame, which can increase the water hammer simulation function and improve the self-cleaning ability of the pre-filter with backwash switching, thereby greatly extending the service life of the filter.

[0013] In the above-mentioned pre-filter with backwash switching, the upper part of the upper connecting sleeve is embedded in the water outlet, and the lower part is connected to the inner wall of the filter bottle, so that water enters from the first water inlet. The inner side of the upper connecting sleeve also has step one and step two, and step two is located below step one. The outside of the skeleton also has a boss. The upper part of the skeleton is sleeved on the inner side of the upper connecting sleeve, and the top of the skeleton abuts against step one, and the boss abuts against step two. The first water inlet is opened at step two.

[0014] The upper part of the upper connecting sleeve is embedded below the water outlet, and the lower part of the upper connecting sleeve is connected to the inner wall of the filter bottle. A first water inlet is also provided in the middle of the upper connecting sleeve, so that water can enter the filter bottle from the water inlet. The diameter of the boss matches the inner diameter of the step two of the upper connecting sleeve. Since the skeleton can move to switch between filtering mode and backwashing mode, when the skeleton is in the filtering mode, the upper surface of the boss abuts against the step two of the upper connecting sleeve, so that water flows from the first water inlet to the third water inlet and enters the skeleton, and the water flows from the outside to the inside and enters the skeleton after being filtered. If the skeleton moves down in the backwashing mode, the lower surface of the boss is flush with the lower surface of the upper connecting sleeve, and the side surface of the boss is low against the inner wall of the upper connecting sleeve, so that water flows from the first water inlet to the second water inlet and enters the skeleton, and the water flows from the inside to the outside, thereby realizing backwashing of the filter screen and the laminated sheets.

[0015] In the above-mentioned pre-filter with backwash switching, the lower part of the upper connecting sleeve is also connected to a guide sleeve, and the guide sleeve is also provided with an inclined fourth water inlet. The lower part of the upper connecting sleeve is also provided with a snap-in groove, and the guide sleeve is also provided with a block that can be embedded in the snap-in groove.

[0016] A guide sleeve is also connected to the lower part of the upper connecting sleeve, and an inclined fourth water inlet is also opened on the guide sleeve. Water flows from the first water inlet to the fourth water inlet, and then is filtered by the laminations and filter screen outside the frame. After filtration, the water enters the frame through the third water inlet on the frame.

[0017] There is also a clamping block on the upper part of the guide sleeve, which is annularly arranged on the upper part of the guide sleeve. A clamping groove for the clamping block to be embedded in the lower part of the upper connecting sleeve is opened. The number of the clamping grooves corresponds to the number of the clamping blocks, so that the guide sleeve can be clamped on the lower part of the upper connecting sleeve.

[0018] In the above-mentioned pre-filter with backwash switching, the bottom of the anti-water hammer column has a protruding arc portion, the upper part of the arc portion also has a supporting edge, and a hollow groove is opened inside the anti-water hammer column.

[0019] The anti-water hammer column is connected at the center of the frame, which can effectively prevent the water hammer effect and increase the service life of the equipment.

[0020] In the above-mentioned pre-filter with backwash switching, the lower connecting sleeve is also connected to a piston sleeve, and the piston sleeve contacts the inner wall of the filter bottle. The upper part of the lower connecting sleeve also has a convex edge, and the upper part of the lower connecting sleeve also has a limit block. The two sides of the limit block also have limit edges, the limit edge located on the outside abuts against the lower part of the frame, and the limit edge located on the inside abuts against the upper surface of the supporting edge. The inner wall of the lower connecting sleeve also has a clamping edge, and the arc portion abuts against the clamping edge. The lower connecting sleeve is also provided with a drain outlet, and the drain outlet is located below the clamping edge.

[0021] The edge of the lower connecting sleeve is also connected to a piston sleeve, which is connected to the inner wall of the filter bottle. The upper part of the lower connecting sleeve is also provided with a convex edge, which can play a supporting role for the filter screen and the frame.

[0022] The upper part of the lower connecting sleeve is also connected to a limiting block, and the inner wall of the lower connecting sleeve is also provided with a clamping edge, through which the limiting edge on the limiting block and the clamping edge on the lower connecting sleeve can limit the waterproof hammer column and connect it inside the frame.

[0023] In the above-mentioned pre-filter with backwash switching, a reinforcing connection block is further provided at the edge of the anti-hammer column, and the reinforcing connection block is connected between the outer wall of the anti-hammer column and the inner wall of the frame.

[0024] The reinforced connecting blocks on both sides of the anti-hammer column can make the anti-hammer column more stably and securely connected to the inside of the frame.

[0025] In the above-mentioned pre-filter with backwash switching, the bottom of the skeleton rests on the convex edge, one end of the filter rests on the lower surface of the boss, and the other end rests on the upper surface of the convex edge. There are several laminations, and several laminations are spaced and sleeved on the filter.

[0026] The filter is installed on the outside of the frame, that is, the filter is sleeved on the frame, the upper end of the filter is against the lower surface of the boss of the frame, and the lower end is against the upper surface of the convex edge of the lower connecting sleeve. A plurality of laminations are also installed on the outside of the filter, and the plurality of laminations are sleeved on the filter at intervals, so that secondary filtration can be achieved and the filtering effect is greatly improved.

[0027] In the above-mentioned pre-filter with backwash switching, a filter net is also sleeved on the outer wall of the second water inlet.

[0028] A filter is installed at the upper part of the frame, that is, at the second water inlet. When backwashing is performed, the frame moves, the first water inlet is connected to the second water inlet, and water can enter the frame through the second water inlet and be filtered by the filter when flowing through.

[0029] In the above-mentioned pre-filter with backwash switching, a sealing member is further provided at the sewage outlet, the sealing member is connected to the bottom of the filter bottle, and a ball valve is further provided inside the sealing member.

[0030] The ball valve is equipped with a discharge knob to flush and drain sewage. Open the ball valve to drain sewage, and close the ball valve to filter.

[0031] Compared with the prior art, the present invention provides a pre-filter with backwash switching, wherein an upper and a lower connecting sleeve are arranged inside the filter bottle for installing a frame, and the upper connecting sleeve also has a step, the top of the upper connecting sleeve is embedded in the water outlet, and the lower part is connected to the inner wall of the filter bottle, the upper part of the frame is connected to the upper connecting sleeve, and the lower part of the frame is connected to the inside of the filter bottle through the lower connecting sleeve, and the frame can move inside the filter bottle, and the frame moves upward so that water flows from the first water inlet, the fourth water inlet, and the third water outlet into the frame, and the water flows from the outside to the inside, and is filtered through the laminated sheets and the filter screen outside the frame, and the frame moves downward, and the boss outside the frame is located on the platform At the second step, the lower surface of the boss is flush with the lower surface of the upper connecting sleeve, and the side surface of the boss is in surface contact with the inner wall of the upper connecting sleeve, so that the upper connecting sleeve and the guide sleeve are closed, and the first water inlet is connected to the second water inlet. Water flows from the first water inlet to the second water inlet and flows into the frame. Then the water is discharged from the frame to the outside, backwashing the filter screen and the stacking sheets, and finally discharged from the sewage outlet at the bottom of the filter bottle. An anti-water hammer column is also connected to the inside of the frame, which can increase the water hammer simulation function and improve the self-cleaning ability of the pre-filter with backwashing switch, thereby greatly extending the service life of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the structure of a pre-filter with backwash switching.

[0033] Figure 2 This is a schematic diagram of the structure of a pre-filter with backwash switching after the external body of the water purifier is removed.

[0034] Figure 3 This is a schematic diagram of the structure of a pre-filter with backwash switching after removing the internal filter bottle of the water purifier.

[0035] Figure 4 This is a structural schematic diagram of the connection between an upper connecting sleeve and a guide sleeve in a pre-filter with backwash switching.

[0036] Figure 5 The present invention is a schematic diagram of the structure of step one and step two of an upper connecting sleeve in a pre-filter with backwash switching.

[0037] Figure 6This is a schematic diagram of the structure of a guide sleeve in a pre-filter with backwash switching.

[0038] Figure 7 This is a structural schematic diagram of the anti-water hammer column in a pre-filter with backwash switching.

[0039] Figure 8 This is a schematic diagram of the structure of the skeleton of a pre-filter with backwash switching.

[0040] Fig. 9 This is a schematic diagram of the structure of the lower connecting sleeve of a pre-filter with backwash switching.

[0041] In the figure, 1. body; 2. valve head; 3. sewage outlet; 4. water inlet; 5. water outlet; 6. filter bottle; 7. upper connecting sleeve; 8. lower connecting sleeve; 9. anti-water hammer column; 10. first water inlet; 11. second water inlet; 12. third water inlet; 13. fourth water inlet; 14. filter screen; 15. lamination; 16. guide sleeve; 17. frame; 18. step one; 19. step two; 20. boss; 21. snap-in groove; 22. block; 23. arc portion; 24. supporting edge; 25. reinforcing connecting block; 26. piston sleeve; 27. convex edge; 28. limit block; 29. ​​limit edge; 30. drainage outlet. DETAILED DESCRIPTION

[0042] like Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 5 and Figure 6 As shown, the present invention is a pre-filter with backwash switching, comprising a body 1 of the pre-filter with backwash switching, a hollow filter bottle 6 with openings at both ends installed inside the body 1, a valve head 2 connected to the upper part of the filter bottle 6, a sewage outlet 3 connected to the lower part, a water inlet 4 and a water outlet 5 are respectively arranged on both sides of the valve head 2, a movable skeleton 17 is further connected to the inside of the filter bottle 6, an upper connecting sleeve 7 is further connected to the water outlet 5, and a lower connecting sleeve 8 is further connected to the inside of the filter bottle 6 The lower connecting sleeve 8 is directly opposite to the sewage outlet 3. The upper end of the skeleton 17 is sleeved inside the upper connecting sleeve 7, and the lower end is sleeved on the lower connecting sleeve 8. The upper connecting sleeve 7 is provided with a first water inlet 10, and the upper part of the skeleton 17 is also provided with a second water inlet 11. The interior of the skeleton 17 is also connected to a waterproof hammer column 9. The skeleton 17 is also provided with a third water inlet 12, and the third water inlet 12 is also connected to a filter screen 14. The skeleton 17 is also sleeved with a laminate 15.

[0043] The upper part of the upper connecting sleeve 7 is embedded in the water outlet 5, and the lower part is connected to the inner wall of the filter bottle 6, so that water enters from the first water inlet 10. The inner side of the upper connecting sleeve 7 also has a step 18 and a step 2 19, and the step 2 19 is located below the step 18. The outside of the skeleton 17 also has a boss 20. The upper part of the skeleton 17 is sleeved on the inner side of the upper connecting sleeve 7, and the top of the skeleton 17 abuts against the step 18, and the boss 20 abuts against the step 2 19. The first water inlet 10 is opened at the step 2 19.

[0044] The lower part of the upper connecting sleeve 7 is also connected to a guide sleeve 16 , and the guide sleeve 16 is also provided with an inclined fourth water inlet 13 . The lower part of the upper connecting sleeve 7 is also provided with a clamping groove 21 , and the guide sleeve 16 is also provided with a clamping block 22 that can be embedded in the clamping groove 21 .

[0045] The anti-water hammer column 9 has a protruding arc portion 23 at the bottom, and a supporting edge 24 is provided above the arc portion 23 . A hollow groove is provided inside the anti-water hammer column 9 .

[0046] The lower connecting sleeve 8 is also connected to a piston sleeve 26, and the piston sleeve 26 contacts the inner wall of the filter bottle 6. The upper part of the lower connecting sleeve 8 is also provided with a convex edge 27, and the upper part of the lower connecting sleeve 8 is also provided with a limit block 28. The limit blocks 28 are also provided with limit edges 29 on both sides. The limit edge 29 located on the outside abuts against the lower part of the skeleton 17, and the limit edge 29 located on the inside abuts against the upper surface of the support edge 24. The inner wall of the lower connecting sleeve 8 is also provided with a clamping edge, and the arc portion 23 abuts against the clamping edge. The lower connecting sleeve 8 is also provided with a drain outlet 30, and the drain outlet 30 is located below the clamping edge.

[0047] A reinforcing connection block 25 is also provided at the edge of the anti-water hammer column 9 , and the reinforcing connection block 25 is connected between the outer wall of the anti-water hammer column 9 and the inner wall of the frame 17 .

[0048] The bottom of the frame 17 abuts against the convex edge 27 , one end of the filter screen 14 abuts against the lower surface of the boss 20 , and the other end abuts against the upper surface of the convex edge 27 . There are a plurality of laminations 15 , and a plurality of laminations 15 are spaced apart and sleeved on the filter screen 14 .

[0049] A filter screen 14 is also sleeved on the outer wall of the second water inlet 11 .

[0050] A sealing member is also provided at the sewage outlet 3 , and the sealing member is connected to the bottom of the filter bottle 6 , and a ball valve is also provided inside the sealing member.

[0051] A hollow filter bottle 6 is installed inside the water purifier body 1, a valve head 2 is arranged on the top of the filter bottle 6, and the two sides of the valve head 2 are respectively a water inlet 4 and a water outlet 5. A sewage outlet 3 is arranged at the bottom of the filter bottle 6. Water can enter the filter bottle 6 from the water inlet 4 for filtration, and then be discharged from the water outlet 5 after filtration.

[0052] The first water inlet 10 is opened on the upper connecting sleeve 7 , the second water inlet 11 is opened on the upper part of the frame 17 , the third water inlet 12 is opened on the middle part of the frame 17 , and the fourth water inlet 13 is opened on the guide sleeve 16 .

[0053] A movable skeleton 17 is also installed inside the filter bottle 6. The upper part of the skeleton 17 is connected to the water outlet 5 through the upper connecting sleeve 7, and the lower part of the skeleton 17 is connected to the inside of the filter bottle 6 through the lower connecting sleeve 8. The skeleton 17 can move upward or downward in the filter bottle 6. Upward, the first water inlet 10 is connected with the third water inlet 12 to achieve water flowing from outside to inside. Downward, the first water inlet 10 is connected with the second water inlet 11 to achieve water flowing from inside to outside, thereby realizing the change of the water flow path and switching between filtration and backwashing.

[0054] The interior of the skeleton 17 is also connected with a water hammer prevention column 9, which can increase the water hammer simulation function and improve the self-cleaning ability of the pre-filter with backwashing switch, thereby greatly extending the service life of the filter.

[0055] The upper part of the guide sleeve 16 is also provided with a clamping block 22, which is annularly arranged on the upper part of the guide sleeve 16, and the lower part of the upper connecting sleeve 7 is provided with a clamping groove 21 for the clamping block 22 to be engaged, and the number of the clamping grooves 21 corresponds to the number of the clamping blocks 22, so that the guide sleeve 16 can be clamped on the lower part of the upper connecting sleeve 7.

[0056] The upper part of the upper connecting sleeve 7 is embedded below the water outlet 5, and the lower part of the upper connecting sleeve 7 is connected to the inner wall of the filter bottle 6. The upper connecting sleeve 7 is also provided with a step 18 and a step 2 19. The upper part of the skeleton 17 is located inside the step 18, that is, the second water inlet 11 of the skeleton 17 is located at the step 18, and the boss 20 of the skeleton 17 abuts against the step 2 19. The lower connecting sleeve 8 is also connected with a piston sleeve 26, and the piston sleeve 26 contacts the inner wall of the filter bottle 6. The limiting edge 29 located on the outside abuts against the lower part of the skeleton 17, and the limiting edge 29 located on the inside abuts against the upper surface of the supporting edge 24. The arc portion 23 of the anti-water hammer column 9 abuts on the clamping edge, and the supporting edge 24 of the anti-water hammer column 9 abuts against the inner limiting edge 29, so that the anti-water hammer column 9 is connected to the skeleton 17, and the anti-water hammer column 9 is directly opposite to the third water inlet 12.

[0057] The skeleton 17 can be connected to the filter bottle 6 by the arrangement of the upper connecting sleeve 7 and the lower connecting sleeve 8 . Since the piston sleeve 26 is arranged on the lower connecting sleeve 8 , the movement of the skeleton 17 is facilitated.

[0058] Filtration: Close the sewage outlet 3, water enters from the water inlet 4 of the filter bottle 6, the skeleton 17 moves up, and the top of the skeleton 17 abuts against the inner wall of the upper connecting sleeve 7, that is, the second water inlet 11 of the skeleton 17 is located at step one 18 of the upper connecting sleeve 7, and the upper surface of the boss 20 of the skeleton 17 abuts against the top of step two 19, so that the first water inlet 10, the third water inlet 12, and the fourth water inlet 13 are connected, and water can enter the skeleton 17 from the outside to the inside after being filtered through the stack 15 and the filter screen 14. The flow direction of water is: water flows along the first water inlet 10 of the upper connecting sleeve 7, the fourth water inlet 13 of the guide sleeve 16, the stack 15 and the filter screen 14 outside the skeleton 17, the third water inlet 12 of the skeleton 17, the inside of the skeleton 17, and the water outlet 5 above the skeleton 17.

[0059] Backwash: Open the sewage outlet 3, close the water outlet 5, move the frame 17 downward, move the top of the frame 17 downward, the lower surface of the boss 20 of the frame 17 is flush with the lower surface of the upper connecting sleeve 7, the lower surface of the boss 20 abuts against the upper surface of the guide sleeve 16, and the side of the boss 20 abuts against the inner wall of the upper connecting sleeve 7, so that the first water outlet 5 and the fourth water outlet 5 are closed, and the first water outlet 5 is connected to the second water outlet 5, so that water flows from the first water inlet 10 to the second water inlet 11 and enters the frame 17 The water then flows out from the inside to the outside to backwash the filter screen 14 and the stacking sheets 15. The water is washed and filtered from the inside of the frame 17 to the outside. The direction of water flow is: the water follows the first water inlet 10 of the upper connecting sleeve 7, the second water inlet 11 on the upper part of the frame 17, the inside of the frame 17, the third water inlet 12 at the lower part of the frame 17, the filter screen 14 and the stacking sheets 15 outside the frame 17, the drain port 30 of the lower connecting sleeve 8, and the sewage port 3. Finally, the particulate impurities that are backwashed are discharged from the sewage port 3 at the lower part of the filter bottle 6.

[0060] The filter screen 14 is installed on the outside of the skeleton 17, that is, the filter screen 14 is sleeved on the skeleton 17, the upper end of the filter screen 14 abuts against the lower surface of the boss 20 of the skeleton 17, and the lower end abuts against the upper surface of the convex edge 27 of the lower connecting sleeve 8. A plurality of laminates 15 are also installed on the outside of the filter screen 14, and the plurality of laminates 15 are sleeved on the filter screen 14 at intervals, so that secondary filtration can be achieved, which greatly improves the filtering effect.

[0061] When the skeleton 17 is displaced, since the lower part of the skeleton 17 is connected to the lower connecting sleeve 8, and the outside of the lower connecting sleeve 8 is also connected to the piston sleeve 26, when the skeleton 17 moves, the upper connecting sleeve 7 is fixedly connected to the water outlet 5, and the skeleton 17 and the lower connecting sleeve 8 move synchronously, and the moving range of the skeleton 17 and the lower connecting sleeve 8 is the size of step two 19, that is, the moving distance is only the height of step two 19.

[0062] In this way, the structure improves the self-cleaning ability of the filter, thereby greatly extending the service life of the filter, can effectively prevent the water hammer effect, and further increase the service life of the equipment.

[0063] All technical features in this embodiment can be freely combined according to actual needs.

[0064] Finally, it should be noted that the above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A pre-filter with backwash switch, comprising a pre-filter body with backwash switch, a hollow filter bottle with openings at both ends installed inside the body, a valve head connected to the upper part of the filter bottle, a sewage outlet connected to the lower part, a water inlet and a water outlet respectively arranged on both sides of the valve head, characterized in that: A movable skeleton is also connected to the inside of the filter bottle, an upper connecting sleeve is also connected to the water outlet, a lower connecting sleeve is also connected to the inside of the filter bottle, the lower connecting sleeve is directly opposite to the sewage outlet, the upper end of the skeleton is sleeved inside the upper connecting sleeve, and the lower end is sleeved on the lower connecting sleeve, a first water inlet is provided on the upper connecting sleeve, a second water inlet is also provided on the upper part of the skeleton, a waterproof hammer column is also connected to the inside of the skeleton, a third water inlet is also provided on the skeleton, a filter screen is also connected to the third water inlet, and a laminate is also sleeved on the skeleton.

2. A pre-filter with backwash switch according to claim 1, characterized in that: The upper part of the upper connecting sleeve is embedded in the water outlet, and the lower part is connected to the inner wall of the filter bottle, so that water enters from the first water inlet. The inner side of the upper connecting sleeve is also provided with step one and step two, and step two is located below step one. The outside of the skeleton is also provided with a boss. The upper part of the skeleton is sleeved on the inner side of the upper connecting sleeve, and the top of the skeleton abuts against step one, and the boss abuts against step two. The first water inlet is opened at step two.

3. A pre-filter with backwash switch according to claim 2, characterized in that: The lower part of the upper connecting sleeve is also connected to a guide sleeve, and the guide sleeve is also provided with an inclined fourth water inlet. The lower part of the upper connecting sleeve is also provided with a clamping groove, and the guide sleeve is also provided with a clamping block that can be embedded in the clamping groove.

4. A pre-filter with backwash switch according to claim 3, characterized in that: The bottom of the anti-water hammer column has a protruding arc portion, and the upper part of the arc portion also has a supporting edge. The anti-water hammer column has a hollow groove inside.

5. A pre-filter with backwash switch according to claim 4, characterized in that: The lower connecting sleeve is also connected to a piston sleeve, and the piston sleeve contacts the inner wall of the filter bottle. The upper part of the lower connecting sleeve is also provided with a convex edge, and the upper part of the lower connecting sleeve is also provided with a limit block. The two sides of the limit block are also provided with limit edges, the limit edge located on the outside abuts against the lower part of the frame, and the limit edge located on the inside abuts against the upper surface of the supporting edge. The inner wall of the lower connecting sleeve is also provided with a clamping edge, and the arc portion abuts against the clamping edge. The lower connecting sleeve is also provided with a drain outlet, and the drain outlet is located below the clamping edge.

6. A pre-filter with backwash switch according to claim 4, characterized in that: A reinforcing connection block is also provided at the edge of the anti-water hammer column, and the reinforcing connection block is connected between the outer wall of the anti-water hammer column and the inner wall of the frame.

7. A pre-filter with backwash switch according to claim 5, characterized in that: The bottom of the frame is against the convex edge, one end of the filter is against the lower surface of the boss, and the other end is against the upper surface of the convex edge. There are several laminations, and several laminations are spaced and sleeved on the filter.

8. A pre-filter with backwash switch according to claim 1, characterized in that: A filter screen is also sleeved on the outer wall of the second water inlet.

9. A pre-filter with backwash switch according to claim 1, characterized in that: A sealing member is also provided at the sewage outlet, the sealing member is connected to the bottom of the filter bottle, and a ball valve is also provided inside the sealing member.

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