CN114616963B - A water and fertilizer controllable drip irrigation device based on the Internet of Things - Google Patents

Abstract

The invention relates to the technical field of drip irrigation equipment, in particular to water and fertilizer adjustable drip irrigation equipment based on the Internet of things, which comprises a connecting pipe, wherein the connecting pipe is connected with a bent pipe in a matched manner through a pressurizing mechanism; a sealing mechanism is arranged in the supercharging mechanism; the connecting pipe is sleeved with a fixing mechanism; the fixed mechanism is connected with a lubricating mechanism; the elbow is provided with a connecting mechanism in a matching way; the connecting mechanism is provided with a water dropper; the connecting pipe and the bent pipe are connected together through the pressurizing mechanism, and the pressurizing mechanism is pressed, so that the connecting pipe and the bent pipe can be conveniently sealed when the sealing mechanism is expanded, and the condition of leakage during water delivery can be favorably prevented; the connecting mechanism is rotated, so that the connecting mechanism is conveniently connected with the bent pipe, and an operator can conveniently install and fix the water conveying pipeline; can insert the pipeline through fixed establishment in the soil layer, lubricated mechanism's setting is also convenient for operating personnel to adjust fixed establishment's position.

Description

A water and fertilizer controllable drip irrigation device based on the Internet of Things

technical field

The invention relates to the technical field of drip irrigation equipment, in particular to a drip irrigation equipment with adjustable water and fertilizer based on the Internet of Things.

Background technique

Drip irrigation uses plastic pipes to send water to the roots of crops through holes or drippers on capillaries with a diameter of about 10mm for local irrigation. Compared with sprinkler irrigation, drip irrigation has a higher effect of saving water and increasing production. At the same time, it can be combined with fertilization to more than double the fertilizer efficiency. It is suitable for irrigation of fruit trees, vegetables, commercial crops and greenhouses, and can also be used for irrigation of field crops in places where there is drought and water shortage.

However, before preparing the vegetable water and fertilizer drip irrigation work, the operator needs to manually assemble the drip irrigation pipeline. The joints of the pipeline are tight at the beginning of assembly, and it is inconvenient for the operator to install and disassemble. After long-term use, repeated installation and disassembly are also easy. Make the pipe connection loose, which will easily lead to leakage during water transmission, which is not conducive to improving the drip irrigation effect; in addition, when fixing the drip irrigation pipe, it can be limited by the fixing bracket, but it is inconvenient for the operator to manually disassemble , Touching the pipeline when using tools to disassemble, it is easy to damage the pipeline, which is not conducive to improving the efficiency of drip irrigation equipment.

Contents of the invention

Aiming at the problems in the prior art, the present invention provides a water and fertilizer controllable drip irrigation device based on the Internet of Things.

The technical solution adopted by the present invention to solve its technical problems is: a water and fertilizer controllable drip irrigation device based on the Internet of Things, including a connecting pipe, and the connecting pipe is connected with the elbow through a booster mechanism; There is a sealing mechanism; the connecting pipe is sleeved with a fixing mechanism; the fixing mechanism is connected with a lubricating mechanism; the elbow is equipped with a connecting mechanism; the connecting mechanism is equipped with a dripper;

The booster mechanism includes a sleeve, the sealing mechanism includes a one-way valve, two check valves are symmetrically installed on the sleeve, an air intake pipe is fixedly connected to the sleeve, and a Sealing ring, and the one-way valve communicates with the sealing ring through the intake pipe, the two sealing rings are connected through the exhaust pipe, the sleeve is threaded with a sealing plug, and the two sealing rings are respectively connected with The pipe and the elbow interfere, and the sealing plug interferes with the end of the exhaust pipe.

Specifically, the pressurization mechanism also includes a chute, the sleeve is provided with a chute, the chute communicates with the one-way valve, and a push rod is fitted and slid in the chute, and the push rod is covered with A telescopic spring is connected, and the push rod is connected with the casing through the telescopic spring, and the connecting pipe is connected with the elbow through the casing, and two first filter screens are symmetrically fixedly connected to the casing, and the The first filter screen communicates with the connecting pipe and the elbow.

Specifically, the fixing mechanism includes an inserting block, an inserting block is sleeved on the connecting pipe, an inserting rod is fixedly connected to the inserting block, and several inserting rods are arranged equidistantly, and on the inserting block A plurality of empty slots are provided equidistantly, and rubber pads are bonded to the empty slots.

Specifically, the lubricating mechanism includes an oil storage tank, the plug is provided with an oil storage tank, the plug is fitted with balls for rotation, the balls are rollingly connected with the connecting pipe, and the plug is fitted with A fiber sponge, and the oil storage tank communicates with the fiber sponge, the balls are in conflict with the fiber sponge, an oil plug is threaded on the plug, and several balls are arranged equidistantly in a ring.

Specifically, the connection mechanism includes a fixed sleeve, the elbow is fixedly connected with a fixed sleeve, the fixed sleeve is threadedly connected with a drain pipe, the drain pipe is equipped with a dripper, and the drain pipe is covered with a A conduit is connected, and a second filter screen is fixedly installed on the conduit, the cross section of the second filter screen is in a wave-like structure, and the second filter screen communicates with the elbow and the drain pipe.

The beneficial effects of the present invention are:

(1) A water and fertilizer controllable drip irrigation device based on the Internet of Things according to the present invention connects the connecting pipe and the elbow through a booster mechanism, presses the booster mechanism, and then facilitates the sealing of the connecting pipe when the sealing mechanism expands. , The elbow is sealed, which is beneficial to prevent leakage during water delivery, that is, when the operator assembles the drip irrigation pipeline, he can first connect the connecting pipe and the elbow through the sleeve, and then press the push rod with his hand , the sliding connection between the push rod and the sleeve, the push rod is sleeved with a telescopic spring, the push rod is connected with the sleeve through the telescopic spring, the sleeve is provided with a chute, when the push rod slides, the telescopic spring is stretched, and then The gas in the chute is discharged into the intake pipe through the one-way valve installed in the casing, and the sealing ring is fixedly installed on the casing, and the gas in the intake pipe enters the sealing ring, thereby causing the sealing ring to expand, thereby making the seal The ring interferes with the connecting pipe and the elbow, so that it is convenient to fix the connecting pipe and the elbow, and it is also beneficial to prevent the connecting pipe and the elbow from falling off from the casing; when the operator needs to disassemble the connecting pipe and the elbow , you can turn the sealing plug by hand, the sealing plug is threadedly connected with the casing, and the two sealing rings pass through the exhaust pipe chain, when the sealing plug is taken off, the gas in the sealing ring can be discharged through the exhaust pipe , which is conducive to improving the use effect of drip irrigation equipment.

(2) A kind of water and fertilizer controllable drip irrigation equipment based on the Internet of Things according to the present invention, the connection mechanism is rotated, and then it is convenient to connect it with the elbow, and then it is convenient for the operator to install and fix the water pipeline, that is: After the elbow and the connecting pipe are installed, the drain pipe can be rotated by hand. Since the elbow is fixed with a fixed sleeve, and the drain pipe and the fixed sleeve are threaded, it is convenient for the operator to quickly install the drain pipe; the drain pipe A conduit is sleeved on the conduit, and a second filter screen is installed on the conduit. The second filter screen is arranged in a wave-like structure, which facilitates filtering of impurities contained in the water during water delivery, thereby helping to prevent impurities from clogging the inside of the dripper and causing A case where the dripper does not drain properly.

(3) According to the water and fertilizer controllable drip irrigation equipment based on the Internet of Things of the present invention, when the pipeline is fixed, the operator can insert the pipeline into the soil layer through the fixing mechanism, and the setting of the lubrication mechanism is also convenient for the operator. Adjust the position of the fixing mechanism, which is beneficial to improve the use effect of the equipment, that is, when the drip irrigation pipe needs to be fixed, the operator can respectively socket the plug on the connecting pipe and the drain pipe, and the plug and the rod Since the end of the insertion rod is pointed, the operator can insert the insertion rod into the soil layer when placing his hand in the empty slot of the insertion block, which is convenient for connecting pipes or drainage pipes. Fixed, at the same time, the setting of the plug block is also beneficial to prevent the operator from being inconvenient to take it out from the soil layer when the drip irrigation pipe needs to be dismantled; The oil tank is connected with the fiber sponge installed in the insert block, and there are several balls arranged in a circular equidistant arrangement in the insert block. Since the balls and the fiber sponge conflict, when the position of the insert block is adjusted, the balls will flow along the connecting pipe or drain The tube rolls, and then squeezes the fiber sponge, so that the lubricating oil inside can be applied to the balls, so that it is convenient to lubricate the balls, and it is also helpful to prevent the inconvenient adjustment of the position of the plug after long-term use.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a kind of overall structure schematic diagram of a kind of preferred embodiment of the water and fertilizer controllable drip irrigation equipment based on the Internet of Things provided by the present invention;

Figure 2 is an enlarged schematic view of the structure of part A shown in Figure 1;

FIG. 3 is an enlarged schematic diagram of the structure of part B shown in FIG. 1;

Fig. 4 is a schematic diagram of the connecting structure of the insert block and the insert rod of the present invention;

FIG. 5 is an enlarged schematic diagram of the structure of part C shown in FIG. 4;

Fig. 6 is a schematic diagram of the connecting structure of the push rod and the sleeve of the present invention;

FIG. 7 is an enlarged schematic diagram of the structure of part D shown in FIG. 6;

Fig. 8 is an enlarged schematic diagram of the structure of part E shown in Fig. 6;

Fig. 9 is a schematic diagram of the connection structure between the fixing sleeve and the drainage pipe of the present invention;

FIG. 10 is an enlarged schematic diagram of the structure of part F shown in FIG. 9 .

In the figure: 1. Connecting pipe; 2. Elbow; 3. Booster mechanism; 301. Push rod; 302. Sleeve; 303. First filter screen; 304. Telescopic spring; 305. Chute; 4. Sealing mechanism ; 401, sealing plug; 402, one-way valve; 403, intake pipe; 404, sealing ring; 405, exhaust pipe; 5, fixed mechanism; Rubber pad; 6, lubrication mechanism; 601, oil plug; 602, oil storage tank; 603, fiber sponge; 604, ball; 7, connection mechanism; 701, fixed sleeve; 702, drain pipe; 703, conduit; Filter screen; 8. Dripper.

detailed description

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

As shown in Figures 1-10, a water and fertilizer controllable drip irrigation device based on the Internet of Things according to the present invention includes a connecting pipe 1, and the connecting pipe 1 is connected to the elbow 2 through a pressurization mechanism 3; A sealing mechanism 4 is installed in the booster mechanism 3; a fixing mechanism 5 is sleeved on the connecting pipe 1; a lubricating mechanism 6 is connected to the fixing mechanism 5; a connecting mechanism 7 is installed on the elbow 2; A dripper 8 is installed on the connecting mechanism 7;

The pressurization mechanism 3 includes a sleeve 302, the sealing mechanism 4 includes a one-way valve 402, two check valves 402 are symmetrically installed on the sleeve 302, and an intake pipe 403 is fixedly connected to the sleeve 302 A sealing ring 404 is installed on the sleeve 302, and the one-way valve 402 communicates with the sealing ring 404 through the intake pipe 403, and the two sealing rings 404 are connected through the exhaust pipe 405, and the sleeve 302 A sealing plug 401 is connected to the upper thread, and the two sealing rings 404 interfere with the connecting pipe 1 and the elbow 2 respectively, and the sealing plug 401 interferes with the end of the exhaust pipe 405 .

Specifically, the pressurization mechanism 3 also includes a chute 305, the sleeve 302 is provided with a chute 305, the chute 305 communicates with the one-way valve 402, and a push rod slides in the chute 305 301, the push rod 301 is sleeved with a telescopic spring 304, and the push rod 301 is connected with the sleeve 302 through the telescopic spring 304, and the connecting pipe 1 is connected with the elbow 2 through the sleeve 302. Two first filter screens 303 are symmetrically and fixedly connected to the casing 302, and the first filter screens 303 communicate with the connecting pipe 1 and the elbow pipe 2, and the connecting pipe 1 and the elbow pipe 2 are connected together by the pressurization mechanism 3 , press the booster mechanism 3, and then facilitate the sealing of the connecting pipe 1 and the elbow 2 when the sealing mechanism 4 expands, thereby helping to prevent leakage during water delivery, that is, when the operator assembles the drip irrigation pipeline, The connecting pipe 1 and the curved pipe 2 can be connected together through the sleeve 302 first, and then the push rod 301 is pressed by hand, and the push rod 301 and the sleeve 302 are slidably connected. The rod 301 is connected with the casing 302 through the telescopic spring 304. The casing 302 is provided with a chute 305. When the push rod 301 slides, the telescopic spring 304 is stretched, and then the gas in the chute 305 is installed through the casing 302. The one-way valve 402 is discharged into the inside of the intake pipe 403, the sleeve 302 is fixedly installed with a seal ring 404, the gas in the intake pipe 403 enters into the seal ring 404, and then the seal ring 404 is expanded, and then the seal ring 404 is The connecting pipe 1 and the curved pipe 2 are in conflict, so as to facilitate the fixing of the connecting pipe 1 and the curved pipe 2, it is also beneficial to prevent the connecting pipe 1 and the curved pipe 2 from falling off from the casing 302; when the operator needs to disassemble When connecting the pipe 1 and the elbow 2, the sealing plug 401 can be turned by hand, the sealing plug 401 is threadedly connected with the casing 302, and the two sealing rings 404 pass through the chain of the exhaust pipe 405, when the sealing plug 401 is taken off, Furthermore, it is convenient to discharge the gas in the sealing ring 404 through the exhaust pipe 405, which is beneficial to improve the use effect of the drip irrigation equipment.

Specifically, the fixing mechanism 5 includes an inserting block 501, the connecting pipe 1 is sleeved with an inserting block 501, the inserting block 501 is fixedly connected with inserting rods 503, and several inserting rods 503 are equidistant Arranged, the insert block 501 is equidistantly provided with several empty slots 502, and rubber pads 504 are bonded to the empty slots 502.

Specifically, the lubricating mechanism 6 includes an oil storage tank 602, the plug 501 is provided with an oil storage tank 602, the plug 501 is fitted with a ball 604 for rotation, and the ball 604 is rollingly connected with the connecting pipe 1, A fiber sponge 603 is mounted on the plug 501, and the oil storage tank 602 is in communication with the fiber sponge 603. The ball 604 is in conflict with the fiber sponge 603. The plug 501 is threaded with an oil plug 601, several The balls 604 are arranged equidistantly in a ring shape. When fixing the pipeline, the operator can insert the pipeline into the soil layer through the fixing mechanism 5. The setting of the lubricating mechanism 6 is also convenient for the operator to adjust the position of the fixing mechanism 5. adjustment, which is conducive to improving the use effect of the equipment, that is: when the drip irrigation pipeline needs to be fixed, the operator can respectively socket the plug 501 on the connecting pipe 1 and the drain pipe 702, and the plug 501 and the insertion rod 503 Since the end of the inserting rod 503 is pointed, the operator can insert the inserting rod 503 into the soil layer when placing his hand in the slot 502 of the inserting block 501, which facilitates the connection of the connecting pipe 1 Or the drainage pipe 702 is fixed, and the setting of the plug 501 is also conducive to preventing the situation that the operator needs to dismantle the drip irrigation pipeline and it is inconvenient to take it out from the soil layer; the plug 501 is equipped with an oil plug 601. The block 501 is provided with an oil storage tank 602, and the oil storage tank 602 communicates with the fiber sponge 603 installed in the insert block 501. There are several ring-shaped and equidistant balls 604 arranged in the insert block 501. Because the ball 604 and the fiber sponge 603 When adjusting the position of the plug 501, the ball 604 rolls along the connecting pipe 1 or the drain pipe 702, and then squeezes the fiber sponge 603, so that the lubricating oil inside can be applied to the ball 604, so that it is easy to clean While the ball 604 is lubricating, it is also beneficial to prevent the inconvenient adjustment of the position of the inserting block 501 after long-term use.

Specifically, the connection mechanism 7 includes a fixed sleeve 701, the elbow 2 is fixedly connected with a fixed sleeve 701, the fixed sleeve 701 is threaded with a drain pipe 702, and the drain pipe 702 is equipped with a dripper. 8. A conduit 703 is sleeved on the drainage pipe 702, and a second filter screen 704 is fixedly installed on the conduit 703. The cross-section of the second filter screen 704 has a wave-like structure, and the second filter screen 704 It is connected with the elbow 2 and the drain pipe 702, and the connecting mechanism 7 is rotated, so that it is convenient to connect it with the elbow 2, and it is convenient for the operator to install and fix the water pipeline, that is, to install the elbow 2 and the connecting pipe 1 After completion, the drainpipe 702 can be rotated by hand. Since the elbow 2 is fixedly equipped with a fixed sleeve 701, and the drainpipe 702 is threadedly connected with the fixed sleeve 701, it is convenient for the operator to quickly install the drainpipe 702; the drainpipe A conduit 703 is sleeved on the conduit 702, and a second filter screen 704 is installed on the conduit 703. The second filter screen 704 is arranged in a wave-like structure, which is convenient for filtering impurities contained in the water during water delivery, thereby helping to prevent impurities from clogging The interior of the dripper 8 leads to a situation where the dripper 8 cannot drain water normally.

When the present invention is in use, first, when the operator assembles the drip irrigation pipeline, the connecting pipe 1 and the elbow pipe 2 can be connected together through the sleeve 302, and then the push rod 301 is pressed by hand, and the connection between the push rod 301 and the sleeve 302 is The telescopic spring 304 is sleeved on the push rod 301, and the push rod 301 is connected with the casing 302 through the telescopic spring 304. The casing 302 is provided with a chute 305. When the push rod 301 slides, the telescopic spring 304 is pulled stretch, and then the gas in the chute 305 is discharged into the inside of the intake pipe 403 through the one-way valve 402 installed in the casing 302, and the sealing ring 404 is fixedly installed on the casing 302, and the gas in the intake pipe 403 enters the sealing ring 404, and then expand the sealing ring 404, and then make the sealing ring 404 interfere with the connecting pipe 1 and the elbow 2, so that it is convenient to fix the connecting pipe 1 and the elbow 2, and it is also beneficial to prevent the connecting pipe 1 and the elbow The situation that the pipe 2 falls off from the casing 302; when the operator needs to disassemble the connecting pipe 1 and the elbow 2, the sealing plug 401 can be turned by hand, and the sealing plug 401 is threadedly connected with the casing 302, and the two sealing rings 404 passes through the exhaust pipe 405 chain, and when the sealing plug 401 is taken off, the gas in the sealing ring 404 is discharged through the exhaust pipe 405, thereby helping to improve the use effect of the drip irrigation equipment; the elbow 2 and the connecting pipe 1. After installation, the drainage pipe 702 can be rotated by hand. Since the fixed sleeve 701 is fixedly installed on the elbow 2, and the drainage pipe 702 and the fixed sleeve 701 are threaded, it is convenient for the operator to quickly install the drainage pipe 702; A conduit 703 is sleeved on the drainpipe 702, and a second filter screen 704 is installed on the conduit 703. The second filter screen 704 is arranged in a wave-like structure, which is convenient for filtering impurities contained in the water during water delivery, thereby helping to prevent Impurities block the inside of the dripper 8 and cause the dripper 8 to fail to drain normally; when the drip irrigation pipeline needs to be fixed, the operator can respectively socket the plug 501 on the connecting pipe 1 and the drain pipe 702, and the plug 501 and The insertion rods 503 are fixedly connected, because the ends of the insertion rods 503 are pointed, and then when the operator places his or her hand on the empty slot 502 of the insertion block 501, the insertion rods 503 can be inserted into the soil layer, thereby facilitating Fix the connecting pipe 1 or the drainage pipe 702, and the setting of the plug 501 is also beneficial to prevent the situation that the operator needs to disassemble the drip irrigation pipeline and it is inconvenient to take it out from the soil layer; the plug 501 is installed with oil The plug 601 and the plug 501 are provided with an oil storage tank 602, the oil storage tank 602 communicates with the fiber sponge 603 installed in the plug 501, and there are several balls 604 arranged in a circular equidistant arrangement in the plug 501, because the balls 604 Conflict with the fiber sponge 603, when the position of the plug 501 is adjusted, the ball 604 rolls along the connecting pipe 1 or the drain pipe 702, and then squeezes the fiber sponge 603, so that the lubricating oil inside can be applied to the ball 604, thereby facilitating While lubricating the ball 604, it is also beneficial to prevent the inconvenient adjustment of the position of the inserting block 501 after long-term use.

It will be apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode only includes an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

Claims (3)

1. The water and fertilizer adjustable drip irrigation equipment based on the Internet of things is characterized by comprising a connecting pipe (1), wherein the connecting pipe (1) is connected with a bent pipe (2) in a matched manner through a pressurization mechanism (3); a sealing mechanism (4) is arranged in the supercharging mechanism (3); a fixing mechanism (5) is sleeved on the connecting pipe (1); the fixed mechanism (5) is connected with a lubricating mechanism (6); the elbow (2) is provided with a connecting mechanism (7) in a matching way; the connecting mechanism (7) is provided with a dripper (8);

the supercharging mechanism (3) comprises a sleeve (302), the sealing mechanism (4) comprises a one-way valve (402), two one-way valves (402) are symmetrically installed on the sleeve (302), an air inlet pipe (403) is fixedly connected to the sleeve (302), a sealing ring (404) is installed on the sleeve (302), the one-way valves (402) are communicated with the sealing ring (404) through the air inlet pipe (403), the two sealing rings (404) are connected in a matched mode through an exhaust pipe (405), and a sealing plug (401) is connected to the sleeve (302) in a threaded mode; the two sealing rings (404) are respectively abutted against the connecting pipe (1) and the bent pipe (2), and the sealing plug (401) is abutted against the end part of the exhaust pipe (405);

the pressurization mechanism (3) further comprises a sliding groove (305), the sleeve (302) is provided with the sliding groove (305), the sliding groove (305) is communicated with the one-way valve (402), a push rod (301) is matched and slid in the sliding groove (305), a telescopic spring (304) is sleeved on the push rod (301), and the push rod (301) is matched and connected with the sleeve (302) through the telescopic spring (304); the connecting pipe (1) is connected with the elbow (2) in a matching way through a sleeve (302), two first filter screens (303) are symmetrically and fixedly connected to the sleeve (302), and the first filter screens (303) are communicated with the connecting pipe (1) and the elbow (2);

the fixing mechanism (5) comprises an inserting block (501), the inserting block (501) is sleeved on the connecting pipe (1), inserting rods (503) are fixedly connected to the inserting block (501), and the inserting rods (503) are arranged at equal intervals; a plurality of empty grooves (502) are equidistantly formed in the insert block (501), and rubber pads (504) are bonded at the positions of the empty grooves (502);

the lubricating mechanism (6) comprises an oil storage tank (602), the inserting block (501) is provided with the oil storage tank (602), the inserting block (501) is matched and rotated with a ball (604), the ball (604) is connected with the connecting pipe (1) in a rolling manner, the inserting block (501) is matched and provided with a fiber sponge (603), the oil storage tank (602) is communicated with the fiber sponge (603), and the ball (604) is abutted to the fiber sponge (603); the insert block (501) is connected with an oil plug (601) in a threaded manner, and the balls (604) are arranged in an annular equidistant manner.

2. The water and fertilizer adjustable drip irrigation equipment based on the Internet of things according to claim 1, characterized in that: coupling mechanism (7) are including fixed cover (701), fixed cover (701) of fixedly connected with is gone up in return bend (2), threaded connection has drain pipe (702) on fixed cover (701), water dropper (8) are installed in the cooperation on drain pipe (702).

3. The water and fertilizer adjustable drip irrigation equipment based on the Internet of things according to claim 2, characterized in that: the utility model discloses a drainage pipe, including drain pipe (702), pipe (703) have been cup jointed on the drain pipe (702), fixed mounting has second filter screen (704) on pipe (703), the cross-section of second filter screen (704) is wavy structure, just second filter screen (704) and return bend (2), drain pipe (702) intercommunication.

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