Anti-clogging nozzle structure and high-pressure backwashing device

Abstract

The utility model belongs to the field of nozzles, and specifically relates to an anti-clogging nozzle structure and a high-pressure backwashing device, wherein the anti-clogging nozzle structure includes a nozzle and a flexible filter; the nozzle includes a body and a water inlet end, a delivery channel and a nozzle hole that are sequentially connected and arranged on the body, the flexible filter covers the water inlet end, and a plurality of filter holes are arranged on the flexible filter; during the process of liquid of set pressure being delivered to the nozzle hole through the flexible filter, the pressure of the liquid drives the flexible filter to shrink inwardly, and at this time, the aperture at the minimum aperture of the filter hole is smaller than the aperture of the nozzle hole and the size of the liquid delivery channel in the body. The anti-clogging nozzle structure provided by the utility model is suitable for use with liquid nozzles of various models and sizes, and utilizes the flexible deformation ability of the flexible filter to realize the functions of anti-clogging of the nozzle, automatic stripping of foreign matter on the flexible filter, and backwashing of the nozzle and the flexible filter.

Description

Technical Field

[0001] The utility model belongs to the field of nozzles, and in particular relates to an anti-clogging nozzle structure and a high-pressure backwashing device. Background Art

[0002] The smaller the nozzle aperture of the liquid nozzle, the better the atomization effect will be, and the smaller the nozzle aperture, the more likely it is to be blocked. In order to reduce or avoid the blocking problem, the existing liquid nozzles often use a filter screen and an anti-blocking structure at the water inlet end of the nozzle to improve the anti-blocking effect of the nozzle. For example, the Chinese patent "CN215784221U-A water spray gun head with anti-blocking function" not only sets a primary filter screen at the entrance of the nozzle to prevent foreign matter from entering the nozzle and the nozzle, but also sets an anti-blocking structure in the nozzle and the nozzle. Although this has a good anti-blocking effect, this method has some other problems. First, foreign matter will be retained on the primary filter screen and difficult to clean. As time goes by, on the one hand, foreign matter will affect the water intake of the nozzle, and on the other hand, foreign matter retained for a long time will pollute the water source. Second, the anti-blocking structure is complicated, and the more complicated the structure is, the higher the cost and the more likely it is to fail. Moreover, the entire anti-blocking mechanism is set in a small space such as the nozzle and the nozzle, which is difficult to maintain. Therefore, there is an urgent need for a nozzle structure with a simple and reliable structure and high anti-blocking and easy-to-clean properties. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an anti-clogging nozzle structure and a high-pressure backwashing device with the functions of anti-clogging of the nozzle, automatic stripping of foreign matter on the flexible filter screen, and backwashing of the nozzle and the flexible filter screen.

[0004] The utility model provides an anti-clogging nozzle structure, comprising a nozzle and a flexible filter screen;

[0005] The nozzle comprises a body, and a water inlet end, a delivery channel and a nozzle hole which are sequentially connected and arranged on the body, the flexible filter net covers the water inlet end, and the flexible filter net is provided with a plurality of filter holes;

[0006] When the liquid of set pressure is delivered to the nozzle hole through the flexible filter net, the pressure of the liquid drives the flexible filter net to shrink inwardly. At this time, the aperture of the filter hole at the minimum aperture is smaller than the aperture of the nozzle hole and the size of the liquid delivery channel in the body.

[0007] Furthermore, the filter holes are respectively a small-diameter end and a large-diameter end along the water flow direction when the nozzle sprays water;

[0008] When the flexible filter screen is concave and contracted, the aperture of the small-diameter end of the filter hole is smaller than the aperture of the nozzle hole and the size of the liquid delivery channel in the body.

[0009] Furthermore, the filtering hole is a conical hole structure, and the hole walls from the small-diameter end to the large-diameter end are consistent.

[0010] Furthermore, the flexible filter screen comprises a cylindrical side wall with a hollow interior, one end of the cylindrical side wall is a closed end, and the other end is an open end;

[0011] The open end cooperates with the water inlet end;

[0012] A plurality of filtering holes are arranged on the cylindrical side wall.

[0013] Furthermore, the filtering hole is provided on the closed end.

[0014] Furthermore, the anti-clogging nozzle structure further comprises a mounting seat, the mounting seat is provided with a mounting hole, and the mounting hole is connected to a water supply cavity;

[0015] The mounting hole is provided with a step on one side close to the water supply cavity, and the flexible filter net is provided with a fixing ring;

[0016] The body is fastened in the mounting hole by a fastening structure, and one end of the body close to the water inlet end abuts against the fixing ring to limit the position on the step.

[0017] Furthermore, the fastening structure is a threaded structure, and the threaded structure includes an internal thread arranged on the inner wall of the mounting hole and an external thread arranged on the outer wall of the main body.

[0018] Furthermore, the fixing ring is made of hard material.

[0019] The utility model also provides a high-pressure backwashing device, which is used to backwash the anti-clogging nozzle structure. The high-pressure backwashing device includes a nozzle joint and a water supply mechanism for providing a set pressure liquid to the nozzle joint;

[0020] The nozzle joint is detachably mounted on the nozzle and is used to deliver cleaning liquid to the water inlet end through the nozzle hole;

[0021] When the liquid of set pressure is transported to the water inlet through the nozzle hole, the pressure of the cleaning liquid drives the flexible filter net to bulge outward, the aperture of the filter hole becomes larger, and foreign matter in the filter hole is removed.

[0022] Furthermore, the nozzle joint and the nozzle are detachably installed using a quick-release structure.

[0023] The beneficial effect of the utility model is that the anti-clogging nozzle structure provided by the utility model is suitable for use with liquid nozzles of various models and sizes, and utilizes the flexible deformation ability of the flexible filter net to realize the functions of anti-clogging of the nozzle, automatic stripping of foreign matter on the flexible filter net, and backwashing of the nozzle and the flexible filter net. The situation of nozzle clogging is greatly reduced, the number of manual cleaning and maintenance is reduced, and the maintenance-free time of the product is increased. At the same time, the maintenance difficulty can be simplified and the stability of the product can be improved. In addition, the entire anti-clogging nozzle structure only adds a flexible filter net at the water inlet end of the conventional nozzle, and the structure is simple and reliable, the cost is low, and it is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Attached Figure 1 It is a schematic diagram of the structure of the utility model;

[0025] Attached Figure 2 This is a schematic diagram of the structure of the flexible filter screen in the utility model;

[0026] Attached Figure 3 It is a front cross-sectional view of the flexible filter screen in the utility model;

[0027] Attached Figure 4 This is a schematic diagram of the structure of the medium and high pressure backwash device of the utility model;

[0028] Attached Figure 5 It is a partial cross-sectional view of the cooperation between the medium and high pressure backwash device and the nozzle of the utility model.

[0029] In the figure, 1-nozzle; 101-body; 102-water inlet end; 103-nozzle hole; 2-flexible filter screen; 201-cylindrical side wall; 202-closed end; 203-open end; 204-filter hole; 2041-small-diameter end; 2042-large-diameter end; 205-fixing ring; 3-mounting seat; 301-mounting hole; 3011-step; 401-water supply cavity; 5-high-pressure backwash device; 501-nozzle joint; 502-high-pressure pipe; 503-water joint. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] As attached Figure 1 -Attached Figure 5 As shown, the utility model provides an anti-clogging nozzle structure, comprising a nozzle 1 and a flexible filter screen 2;

[0036] The nozzle 1 includes a body 101 and a water inlet end 102, a delivery channel and a nozzle hole 103 which are sequentially connected and arranged on the body 101, wherein the nozzle 1 can adopt various liquid nozzles available on the market, and the liquid nozzles all have a water inlet end 102, a delivery channel and a nozzle hole 103, and the water inlet end 102 is used to deliver liquid into the delivery channel and finally spray it out from the nozzle hole 103, wherein the delivery channel has different configurations according to different types of nozzles. The flexible filter net 2 covers the water inlet end 102, and a plurality of filter holes 204 are arranged on the flexible filter net 2, that is, the liquid needs to pass through a plurality of filter holes 204 to enter the delivery channel through the water inlet end 102, and then filter the liquid entering the nozzle 1, to prevent impurities in the liquid from clogging the delivery channel and the nozzle hole 103 in the nozzle 1;

[0037] Specifically, the flexible filter mesh 2 will be deformed by the influence of the liquid flow pressure. When the liquid of the set pressure (the default is the pressure required for the normal use of the nozzle 1, generally high pressure) is transported to the nozzle hole 103 through the flexible filter mesh 2, the pressure of the liquid drives the flexible filter mesh 2 to shrink inward, and the filter hole 204 will be deformed. Along the inward concave direction, the aperture of the filter hole 204 at the end of the outer side of the depression (close to the side of the delivery channel) will become larger, and the aperture of the filter hole 204 at the end of the inner side of the depression (away from the side of the delivery channel) will become smaller. The aperture of the filter hole 204 at the minimum aperture is smaller than the aperture of the nozzle hole 103 and the size of the liquid delivery channel in the body 101, so that foreign matter smaller than the aperture of the nozzle hole 103 and the size of the liquid delivery channel in the body 101 cannot pass through the filter hole 204, and then foreign matter that may cause blockage of the nozzle hole 103 and the delivery channel is blocked in the filter hole 204, thereby realizing the anti-blocking function of the nozzle 1.

[0038] When the liquid is less than the set pressure (the water pressure when cleaning the anti-clogging nozzle structure, generally normal pressure), or when no liquid passes through the flexible filter screen 2 (when the nozzle stops working), the flexible filter screen 2 will rebound and return to its original state. At this time, the deformed filter hole 204 will also rebound and return to its original state. In the process of rebounding, foreign matter trapped at the minimum diameter of the flexible filter screen 2 will be peeled off, so that the foreign matter will be separated from the flexible filter screen 2 and washed away by the cleaning liquid, or washed away by the water flow when the nozzle 1 works next time.

[0039] In addition, when the cleaning liquid is transported from the nozzle hole 103 to the delivery channel and the water inlet end 102, when the nozzle hole 103 is blocked, the cleaning liquid will first clear the nozzle hole 103, and then pass through the delivery channel and flow to the flexible filter 2. When the water pressure of the cleaning liquid reaches the set value, the pressure of the cleaning liquid will drive the flexible filter 2 to expand outward. At this time, the filter hole 204 will be deformed. Along the outward convex direction, the aperture of the filter hole 204 located on the outer side of the convex (away from the side of the delivery channel) will become larger, and the aperture of the filter hole 204 located on the inner side of the convex (close to the side of the delivery channel) will become smaller. That is, when the nozzle 1 is in normal use, the smallest aperture of the filter hole 204 will be transformed into the largest aperture, and the foreign matter blocked at the smallest aperture of the filter hole 204 when the nozzle 1 is in normal use can be released and taken away by the cleaning liquid, so that the nozzle 1 can be backwashed, and it has an excellent backwashing effect.

[0040] The anti-clogging nozzle structure provided by the utility model is suitable for use with liquid nozzles of various models and sizes, and utilizes the flexible deformation ability of the flexible filter screen 2 to realize the functions of anti-clogging of the nozzle 1, automatic stripping of foreign matter on the flexible filter screen 2, and backwashing of the nozzle 1 and the flexible filter screen 2. The clogging of the nozzle 1 is greatly reduced, the number of manual cleaning and maintenance is reduced, and the maintenance-free time of the product is increased. At the same time, the maintenance difficulty can be simplified (no need to disassemble the nozzle 1), and the stability of the product can be improved. In addition, the entire anti-clogging nozzle structure only adds a flexible filter screen 2 to the water inlet end 102 of the conventional nozzle, and the structure is simple and reliable, the cost is low, and it is easy to promote and use.

[0041] In one embodiment, the flexible filter screen 2 is made of flexible rubber, nylon or thin steel sheet.

[0042] Reference Figure 3 In one embodiment, the filter holes 204 are arranged along the direction of water flow when the nozzle 1 sprays water, and are respectively a small-diameter end 2041 and a large-diameter end 2042;

[0043] When the flexible filter screen 2 is concave and shrinks, the aperture of the small-diameter end 2041 of the filter hole 204 is smaller than the aperture of the nozzle hole 103 and the size of the liquid delivery channel in the body 101. In this embodiment, the filter hole 204 is not a cylindrical hole, which makes it easier to deform the filter hole 204. On the other hand, when the nozzle 1 is in normal use, it is convenient to make the small-diameter end 2041 smaller when the flexible filter screen 2 is slightly deformed, thereby improving the filtering effect, and at the same time making the large-diameter end 2042 larger to ensure the delivery stability. On the other hand, when the nozzle 1 is backwashed, the cleaning liquid flows from the large-diameter end 2042 to the small-diameter end 2041, which can form a pressurized force for the cleaning liquid, quickly flush out the debris that is difficult to flush, and improve the backwashing effect.

[0044] Reference Figure 3 In one preferred embodiment, the filter hole 204 is a conical hole structure, that is, the inner diameter of the filter hole 204 gradually increases from the small-diameter end 2041 to the large-diameter end 2042, and the size transitions linearly, and the hole walls from the small-diameter end 2041 to the large-diameter end 2042 are consistent, that is, the filter hole 204 has a conical outer wall, and the filter hole 204 has a convex structure. At this time, when the flexible filter net 2 and the filter hole 204 are concavely contracted and deformed, the two adjacent conical outer walls will move closer to each other, and will clamp or clamp relatively large foreign objects. When the flexible filter net 2 and the filter hole 204 are convexly expanded and deformed, the two adjacent conical outer walls will move away from each other, releasing or peeling off the clamped or clamped foreign objects.

[0045] Reference Figure 2 and attached Figure 3 In one preferred embodiment, the flexible filter screen 2 is a cylindrical structure, and the flexible filter screen 2 comprises a hollow cylindrical side wall 201, one end of the cylindrical side wall 201 is a closed end 202, and the other end is an open end 203;

[0046] The open end 203 cooperates with the water inlet end 102;

[0047] Several of the filter holes 204 are arranged on the cylindrical side wall 201. In this embodiment, on the one hand, the number of filter holes 204 on the flexible filter screen 2 can be greatly increased, thereby increasing the liquid delivery channel area of ​​the filter holes 204 on the flexible filter screen 2, avoiding excessive burden on the liquid source pressure, and ensuring that there are still enough filter holes 204 for normal use when some of the filter holes 204 are blocked, thereby improving reliability. On the other hand, the cylindrical side wall 201 can also ensure that the cleaning liquid flows through the arc surface of the cylindrical side wall 201 when low-pressure water automatic cleaning is performed, and foreign matter is not brought into the filter hole 204. In this embodiment, the deformation of the flexible filter screen 2 is mainly the deformation of the cylindrical side wall 201. Preferably, the filter hole 204 is arranged on the closed end 202 to further increase the number of the filter holes 204. In addition, during specific use, the cylindrical side wall 201 can extend into the main flow channel of the liquid, that is, the water supply cavity 401, so as to facilitate the liquid to enter the water inlet end 102 through the flexible filter screen 2.

[0048] In other embodiments, the flexible filter screen 2 may also adopt other structures, such as a flat plate structure or a semicircular structure provided on the water inlet end 102 .

[0049] In one preferred embodiment, the anti-clogging nozzle structure further includes a mounting seat 3, the mounting seat 3 is provided with a mounting hole 301, the mounting hole 301 is used to mount the nozzle 1, the mounting hole 301 is connected to a water supply cavity 401, and the water supply cavity 401 is used to provide the nozzle 1 with liquid to be sprayed;

[0050] The mounting hole 301 is provided with a step 3011 on the side close to the water supply cavity 401, that is, the mounting hole 301 is a step hole, and the side close to the water supply cavity 401 is a small hole, and the flexible filter net 2 is provided with a fixing ring 205, and the mesh body and the filter hole 204 of the flexible filter net 2 are both arranged in the ring of the fixing ring 205;

[0051] The body 101 is fastened in the mounting hole 301 by a fastening structure, specifically in the large hole, and the end of the body 101 close to the water inlet end 102 abuts the fixing ring 205 on the step 3011. In this embodiment, the flexible filter screen 2 is fixed in the mounting hole 301 by the nozzle 1, and the liquid enters the water inlet end 102 from the water supply cavity 401 through the small hole and the flexible filter screen 2 in sequence. At this time, the flexible filter screen 2 can be disassembled and assembled only by first removing the nozzle 1 from the mounting hole 301, making the disassembly and assembly of the flexible filter screen 2 extremely convenient and quick. In the embodiment in which the flexible filter screen 2 is a cylindrical structure, the fixing ring 205 is arranged at the open end 203 of the flexible filter screen 2, and at this time, the cylindrical side wall 201 extends into the water supply cavity 401 through the small hole of the mounting hole 301.

[0052] In other embodiments, the body 101 and the flexible filter screen 2 may also be an integrated structure, such as integrally formed or welded to each other, or the flexible filter screen 2 and the body 101 may be fastened together by fasteners, and then the body 101 may be fixedly connected to the mounting hole 301 .

[0053] In one embodiment, the fastening structure is a threaded structure, which includes an internal thread arranged on the inner wall of the mounting hole 301 and an external thread arranged on the outer wall of the main body 101, so that the assembly and disassembly of the main body 101 and the mounting hole 301 are extremely convenient and quick, and stable and reliable after disassembly.

[0054] In one embodiment, the fixing ring 205 is made of a hard material, so that the fixing ring 205 can be stably and reliably fixed on the step 3011 .

[0055] Reference Figure 4 and attached Figure 5The utility model also provides a high-pressure backwashing device, which is used to backwash the anti-clogging nozzle structure, and is mainly used to clear foreign matter in the delivery channel and nozzle hole 103 of the nozzle 1 and the filter hole 204 in the flexible filter 2. The high-pressure backwashing device includes a nozzle joint 501 and a water supply mechanism for providing a set pressure liquid to the nozzle joint 501; preferably, the water supply mechanism includes a high-pressure pipe 502 and a water joint 503, and the other end of the water joint 503 is directly connected to the high-pressure water supply device. The high-pressure pipe 502 can be a steel pipe or a flexible pipe, preferably a high-pressure rubber pipe.

[0056] The nozzle joint 501 is detachably mounted on the nozzle 1. After being mounted on the nozzle 1, it is used to deliver cleaning liquid to the water inlet end 102 through the nozzle hole 103, that is, high-pressure cleaning liquid delivers cleaning liquid to the nozzle joint 501 through the water supply mechanism, and then the cleaning liquid passes through the nozzle hole 103, the delivery channel, the water inlet end 102 and the flexible filter screen 2 in sequence, thereby improving the dredging of foreign matter in the nozzle hole 103, the delivery channel and the filter hole 204;

[0057] When the liquid of set pressure is delivered to the water inlet end 102 through the nozzle hole 103 , the pressure of the cleaning liquid drives the flexible filter screen 2 to expand outward, and the aperture of the filter hole 204 becomes larger, making it easier to remove foreign matter in the filter hole 204 .

[0058] In one embodiment, the nozzle joint 501 and the nozzle 1 are detachably mounted using a quick-release structure, thereby greatly facilitating the speed of disassembly and assembly of the nozzle joint 501 and the nozzle 1, wherein the water joint 503 and the water supply device can also be connected using a quick-release structure. Specifically, symmetrical bevel grooves are provided on the corresponding sides of the outer surface of the mounting seat 3, and a quick-lock joint that is detachably engaged with the bevel is provided on the nozzle joint 501. The quick-release structure can also adopt other existing structures.

[0059] The above is only an embodiment and does not limit the present invention in any way. Any person skilled in the art can make many possible changes, modifications or modifications to the present invention without departing from the scope of the present invention by using the above disclosed technical contents. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the present invention should fall within the scope of protection of the present invention.

Claims

1. An anti-clogging nozzle structure, characterized in that: It comprises a nozzle (1) and a flexible filter screen (2); The nozzle (1) comprises a body (101), and a water inlet end (102), a delivery channel and a nozzle hole (103) which are sequentially connected and arranged on the body (101); the flexible filter net (2) covers the water inlet end (102); and a plurality of filter holes (204) are arranged on the flexible filter net (2); When liquid at a set pressure is transported through the flexible filter screen (2) to the nozzle hole (103), the pressure of the liquid drives the flexible filter screen (2) to shrink inwardly, and at this time, the aperture of the filter hole (204) at the minimum aperture is smaller than the aperture of the nozzle hole (103) and the size of the liquid transport channel in the body (101).

2. The anti-clogging nozzle structure according to claim 1, characterized in that: The filter holes (204) are arranged along the direction of water flow when the nozzle (1) sprays water, and are respectively a small-diameter end (2041) and a large-diameter end (2042); When the flexible filter screen (2) is concave and contracted, the aperture of the small-diameter end (2041) of the filter hole (204) is smaller than the aperture of the nozzle hole (103) and the size of the liquid delivery channel in the body (101).

3. The anti-clogging nozzle structure according to claim 2, characterized in that: The filtering hole (204) is a conical hole structure, and the hole walls from the small-diameter end (2041) to the large-diameter end (2042) are consistent.

4. The anti-clogging nozzle structure according to any one of claims 1 to 3, characterized in that: The flexible filter screen (2) comprises a cylindrical side wall (201) with a hollow interior, one end of the cylindrical side wall (201) being a closed end (202) and the other end being an open end (203); The open end (203) cooperates with the water inlet end (102); A plurality of filtering holes (204) are arranged on the cylindrical side wall (201).

5. The anti-clogging nozzle structure according to claim 4, characterized in that: The filtering hole (204) is provided on the closed end (202).

6. The anti-clogging nozzle structure according to any one of claims 1 to 3 or 5, characterized in that: It also comprises a mounting seat (3), the mounting seat (3) being provided with a mounting hole (301), the mounting hole (301) being connected to a water supply cavity (401); A step (3011) is provided on one side of the mounting hole (301) close to the water supply cavity (401), and a fixing ring (205) is provided on the flexible filter screen (2); The body (101) is fastened in the mounting hole (301) via a fastening structure, and an end of the body (101) close to the water inlet end (102) abuts against the fixing ring (205) to limit the position on the step (3011).

7. The anti-clogging nozzle structure according to claim 6, characterized in that: The fastening structure is a threaded structure, which comprises an internal thread arranged on the inner wall of the mounting hole (301) and an external thread arranged on the outer wall of the body (101).

8. The anti-clogging nozzle structure according to claim 6, characterized in that: The fixing ring (205) is made of a hard material.

9. A high pressure backwashing device, characterized in that: The high-pressure backwashing device is used to backwash the anti-clogging nozzle structure according to any one of claims 1 to 8, and the high-pressure backwashing device comprises a nozzle joint (501) and a water supply mechanism for providing a set pressure liquid to the nozzle joint (501); The nozzle joint (501) is detachably mounted on the nozzle (1) and is used to deliver cleaning liquid to the water inlet end (102) through the nozzle hole (103); When liquid at a set pressure is transported through the nozzle hole (103) to the water inlet end (102), the pressure of the cleaning liquid drives the flexible filter screen (2) to bulge outward, the aperture of the filter hole (204) becomes larger, and foreign matter in the filter hole (204) is removed.

10. The high pressure backwashing device according to claim 9, characterized in that: The nozzle joint (501) and the nozzle (1) are detachably mounted using a quick-release structure.

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