CN118391481B - Fluid filter drain valve - Google Patents

Abstract

The invention discloses a drain valve of a fluid filter, which belongs to the field of drain valves of central air conditioners and comprises a filter shell, wherein the filter shell comprises three ports: the cleaning device comprises an inlet end, an outlet end and a cleaning end, wherein the cleaning end is plugged through an end cover, a drain hole is formed in the end cover, a cylindrical filter screen is arranged in the cleaning end, one end of the filter screen extends between the inlet end and the outlet end, the other end of the filter screen is connected with the cleaning end, which is close to the end cover, a sealing device is arranged on the inner side of the drain hole, and the sealing device can move in the filter screen; when the sealing device moves in the filter screen, a local high-pressure area is formed at the front end of the sealing device, a local low-pressure area is formed at the rear end of the sealing device, and a water flow channel is formed between the sealing device and the filter screen to form local strong turbulence. The sealing device has the sealing function, the cleaning function, the functions of reducing the pressure of water hammer and noise, and the like, is multipurpose, has simple and convenient operation process, high cleaning efficiency and rapidness, and improves the cleaning and pollution discharge efficiency.

Description

Fluid filter drain valve

Technical Field

The invention relates to the field of central air-conditioning drain valves, and in particular to a fluid drain valve.

Background Art

The Y-type filter is the most commonly used water fluid filter, which is widely used in the source water system of various central air conditioners such as ground source heat pumps, air conditioning water systems, agricultural product breeding and fish product breeding systems. The working principle of the Y-type filter is: the Y-type filter includes three ports, namely the inlet end, the outlet end and the cleaning end. The cleaning end is provided with a cylindrical filter screen for separating the inlet end and the outlet end. During the flow of the air conditioning circulating water, it first enters the inside of the filter screen through the inlet end, then flows to the outside of the filter screen through the filter screen, and then enters the outlet end. The filter screen separates the impurities and dirt in the air conditioning water flow and deposits them on the inside of the filter screen or adsorbs them in the filter screen holes. Its unique filter screen design prevents the impurities and dirt of the water system from entering the back-end equipment (such as fan coil units), effectively protects the heat exchange effect of the equipment, and is an indispensable component of the system. Depending on the use environment, the impurities and dirt in the filter may be blocky mud and welding slag, or slender fibrous debris, branches, leaves, plastic film, etc., and may even contain some oil stains. In particular, fibrous debris can easily clog the filter screen mesh and is difficult to clean. After using for a period of time, in order to prevent impurities and dirt from clogging the filter screen inside the filter, the filter screen needs to be removed and cleaned frequently. In modern large-scale construction projects, fan coil units and pipeline filters are often installed in small spaces such as suspended ceilings, which brings great inconvenience to maintenance and cleaning work.

The traditional Y-type filter consists of a valve body, a filter screen and an end cover. The end cover at the lower end is used to block the cleaning end. The end cover needs to be disassembled and cleaned in time, otherwise the debris deposited on the filter screen will easily block the water flow and affect the air conditioning effect. When the end cover is disassembled, water will flow out. Due to the small space in the ceiling and nowhere to drain, dripping water during maintenance can easily contaminate the ceiling, causing it to mold and discolor, affecting its appearance. If the valve is not closed tightly, it will cause great losses.

In the patent document with the invention name of "A pipeline filter valve" and the publication number of CN116123333A, a pipeline filter valve is disclosed, including a valve body shell, which includes a medium flow pipe, an operating pipe arranged in the middle of the medium flow pipe, and a valve cover arranged at the port of the operating pipe, the medium flow pipe is connected to the operating pipe, and the valve cover is flange-connected to the operating pipe; a valve core assembly is arranged inside the valve body shell, which includes a valve plate member movably arranged inside the medium flow pipe, a filter member movably arranged between the valve plates, and an operating member arranged at the end of the valve plate member and located in the operating pipe. The invention, through the arrangement of the valve body shell and its internal valve core assembly, makes it possible for the filter valve to not disconnect the medium flow in the pipeline when cleaning or replacing the filter element, and the filter element can be replaced without disassembling the valve body, thereby reducing maintenance time and improving economy. However, this technical solution is to pull out the filter element (filter screen) for cleaning. During the process of cleaning the filter element (filter screen), although the medium can keep running, the fluid in the medium flow pipe lacks the filter screen, and the system may be blocked, which is unsafe.

In the patent document entitled "Filter with a quick flushing device" and having the publication number CN202555069U, a Y-type filter body is disclosed, wherein the filter body comprises a valve body, and the valve body is provided with three ports: an inlet end, an outlet end and a cleaning port, and a filter screen for separating the inlet end and the outlet end is provided in the cleaning port, and a first stop valve is provided on the cleaning port; a second stop valve is provided at the inlet end of the valve body, and a third stop valve is provided at the outlet end of the valve body; the utility model has the advantages of convenient installation and facilitating sewage discharge. When discharging sewage, the first stop valve is opened first, and a small amount of sewage, impurities and dirt flows out, and then the valve is opened for a short flushing until no solid impurities flow out. This technical solution cannot discharge sewage online, that is, during the sewage discharge process, the valves at the inlet end and the outlet end need to be closed, the water system is interrupted during the sewage discharge process, and the air conditioning unit cannot operate normally. In addition, since the caliber of the cleaning end of the valve body is large, the water output is large, the water consumption for one cleaning is large, and the cleaning effect is poor, the impurities and dirt adsorbed in the filter mesh are difficult to be thoroughly cleaned, the loss of the valve is also large, and the cost is high.

In the central air conditioning circulating water system, there is a lack of dedicated drain valves, and only gate valves and ball valves can be used as drain valves (such as the patent document with publication number CN202555069U). These valves are costly and inconvenient to maintain. When used in an environment with impurities and dirt, they are easily damaged and leak. In the central air conditioning system, there is an urgent need for a dedicated drain valve with a simple structure, low cost, convenient drain operation, and quick maintenance and replacement.

Summary of the invention

In order to solve the above technical problems, the present invention provides a fluid filter drain valve which has a simple structure, can be cleaned and drained online, and has the functions of cleaning and draining at the same time.

Online cleaning and drainage means that during the cleaning or drainage process, the operation of the water system does not need to be interrupted, and the air conditioning unit is continuously operated while cleaning or drainage is performed. In the present invention, drainage refers to the discharge of impurities and dirt accumulated inside the filter screen to the filter cleaning end, and cleaning refers to the removal of impurities and dirt adhered to the filter screen (including the holes in the filter screen).

The technical solution of the present invention to solve the above technical problems is: a simple and applicable fluid drain valve, which uses the shell of a Y-type filter and the end cover of the cleaning end as the outer shell of the fluid drain valve, a drain hole is set on the end cover, and a sealing device for sealing the drain hole is placed inside the drain hole. The filter mesh in the filter can be a cylindrical filter, a flat filter, or other types of filter mesh. The working principle of the fluid drain valve is: push the sealing device with your fingers to make the sealing device leave the drain hole, so as to open the drain hole and discharge impurities and dirt in the cleaning end; after letting go, the sealing device automatically blocks the drain hole under the combined action of gravity and water pressure.

On the basis of the above-mentioned fluid drain valve, a fluid filter drain valve with better effect and more perfect structure is further designed, including a filter housing, the filter housing including three ports: an inlet end, an outlet end and a cleaning end, the cleaning end is blocked by an end cover, a drain hole is provided on the end cover, a sealing device for sealing the drain hole is provided on the inner side of the drain hole, a cylindrical filter screen is provided in the cleaning end, one end of the filter screen extends between the inlet end and the outlet end, and is used to separate the inlet end and the outlet end, the other end of the filter screen is connected to the cleaning end near the end cover, a sealing device for sealing the drain hole is provided on the inner side of the drain hole, and the sealing device The device can move inside the filter. When the artificial external force overcomes the resistance (such as the attraction between the magnet in the sealing device and the first magnetic ring, water pressure, etc.), and the sealing device leaves the drain hole, a water flow channel is formed between the sealing device and the filter, and local turbulence is formed in the water flow channel, which impacts and cleans the impurities and dirt on the filter, so that the impurities and dirt are separated from the filter and discharged through the drain hole; the sealing device moves quickly in the filter, forming a local high-pressure area at the front end of the sealing device and a local low-pressure area at the rear end of the sealing device, so that the fluid flows quickly from the high-pressure area to the low-pressure area, which can significantly increase the turbulence intensity in the water flow channel. The turbulence intensity in the water flow channel is increased by the moving speed of the sealing device, forming a series of local strong turbulence, and the impurities and dirt that are firmly adsorbed in the filter are also easily separated from the filter under the repeated action of the squeezing force and suction of the strong turbulence. The cleaning ability of the filter, especially the impurities and dirt in the holes of the filter, is enhanced.

In the above-mentioned fluid filter drain valve, in the cleaning state, the sealing device and the filter screen work together to form local turbulence; in the non-cleaning state, the sealing device fits tightly with the drain hole of the end cover to play a sealing role.

The drain hole of the fluid filter drain valve is in the shape of a truncated cone with a larger inner side and a smaller outer side. A truncated cone-shaped sealing gasket is pasted in the drain hole. A truncated cone-shaped sealing plug can be provided at the lower end of the sealing device. When in the sealed state, the truncated cone-shaped sealing plug just blocks the truncated cone-shaped drain hole covered with the truncated cone-shaped sealing gasket. The contact between the sealing device and the drain hole changes from line contact to surface contact, which can avoid the line contact causing the sealing gasket to be locally subjected to pressure for a long time, resulting in permanent deformation marks, which makes it easy for the drain outlet to leak. This surface contact can not only extend the service life of the truncated cone-shaped sealing gasket, but also ensure the sealing effect.

The above-mentioned fluid filter drain valve has a first magnetic ring fixed on the outside of the end cover, and a magnet fixed in the sealing device; the first magnetic ring outside the end cover and the magnet in the sealing device attract each other, ensuring that the sealing device is tightly connected to the drain hole and that the sealing position is accurate.

The above-mentioned fluid filter drain valve also includes a cleaning handle. One end of the cleaning handle passes through the drain hole on the cleaning end cover and is fixedly connected to the truncated cone-shaped sealing plug, and the other end of the cleaning handle is exposed. The diameter of the cleaning handle is smaller than the diameter of the drain hole. The gap between the cleaning handle and the drain hole is a channel for sewage flow; a step with a larger upper part and a smaller lower part is formed between the cleaning handle and the truncated cone-shaped sealing plug.

In the above-mentioned fluid filter drain valve, the cleaning handle is large at one end and small at the other end, and the diameter of the cleaning handle gradually decreases from the exposed end to the end connected to the sealing device. A large amount of impurities and dirt are generally deposited at the bottom of the filter screen. When cleaning begins, the sealing device and the truncated cone-shaped sealing plug move inward along the cylindrical filter screen. At this time, the cleaning handle is smaller, and the gap between the drain hole and the cleaning handle is larger, which is convenient for a large amount of impurities and dirt to be discharged from the drain hole; when the sealing device cleans the middle and upper part of the cylindrical filter screen, the amount of impurities and dirt is relatively small, and the cleaning handle is larger at this time, and the gap between the drain hole and the cleaning handle is smaller, which can reduce the amount of water discharged from the drain hole; when the sealing device reaches the top of the cylindrical filter screen, the amount of impurities and dirt discharged is the least, and the cleaning handle just blocks the drain hole at this time, and the gap between the drain hole and the cleaning handle is extremely small, and the drain hole stops draining.

In the above-mentioned fluid filter drain valve, the sealing device is a sphere, the diameter of the sphere is smaller than the inner diameter of the filter screen and larger than the diameter of the drain hole, and the maximum diameter of the cleaning handle is equal to the diameter of the drain hole; preferably, the diameter of the sphere is 70-90% of the inner diameter of the filter screen, the diameter of the drain hole is 40-60% of the inner diameter of the filter screen, and the diameter of the cleaning handle is 10-60% of the inner diameter of the filter screen. The size relationship between the various components is reasonable, which can improve the turbulent cleaning effect during cleaning and significantly reduce the amount of water discharged during cleaning.

In the above-mentioned fluid filter drain valve, the truncated cone-shaped sealing plug is made of metal materials such as stainless steel, does not deform when subjected to pressure, and is connected to a sealing device. The sealing device is a hollow sphere made of deformable rubber or plastic material. When cleaning the filter, the sealing device is pushed upward. If larger granular or flaky impurities and dirt are encountered between the filter and the sealing device, the upward thrust of the cleaning handle can deform the sealing device sphere and partially reduce the volume, so that larger particles fall from the gap between the filter and the deformed sealing device and are finally discharged from the drain hole. On the pipeline where the filter drain valve is installed, when the valve is suddenly closed or the water pump unit suddenly stops, water hammer phenomenon will occur. The impact of pressure will cause the pipe wall to be stressed and produce noise. The water hammer effect is extremely destructive. If the pressure is too high, it will cause the pipe to rupture. On the contrary, if the pressure is too low, it will cause the pipe to collapse, thereby damaging the valve and the fixings. The deformable hollow spherical sealing device of the present invention can reduce the volume of the sphere and eliminate the impact pressure of part of the water hammer by changing the shape of the sealing device when the water pressure in the system increases suddenly; and can reduce the vacuum suction after part of the water hammer by changing the shape of the sealing device when the water pressure in the system decreases suddenly; water is an incompressible liquid, and a small amount of deformation can relieve a large pressure. Therefore, in addition to the sealing and cleaning functions, the present invention also has a certain effect of resisting water hammer and reducing water wave impact, which can reduce the noise of the air conditioning pipeline to a certain extent, thereby reducing environmental noise pollution. For example, if the electric two-way valve of the fan coil unit is suddenly closed due to shutdown or other reasons, the water inlet pipe in the air conditioning system will produce water hammer phenomenon. The Y-type filter is installed at the front end of the electric two-way valve. When the water hammer occurs, the deformable hollow spherical sealing device will deform and shrink under the pressure of the water hammer, which plays a role in alleviating the impact of the water flow, not only playing a certain protective role for the system, but also reducing the noise generated by the water hammer.

The above-mentioned fluid filter drain valve has a second magnetic ring at the joint of the drain hose, and the second magnetic ring and the first magnetic ring outside the end cover attract each other to ensure that the drain hose is tightly connected to the drain hole.

The fluid filter drain valve mentioned above has bristles around the sealing device.

The beneficial effects of the present invention are as follows: the sewage valve of the present invention is composed of a sewage hole and a sealing device on the end cover, and has a simple structure, low installation and modification costs, and convenient sewage operation. When cleaning, the present invention does not need to open the end cover of the cleaning end to take out the filter screen from the cleaning end for cleaning, but pushes the sealing device to overcome the effects of water pressure and magnetic force, moves in the filter screen, and utilizes the water pressure of the air conditioning system and the artificially created local turbulent force to flush the impurities and dirt on the filter screen out of the valve body. The operation process is simple, efficient, fast, and water-saving, and fundamentally avoids the loss caused by water leakage due to the valve not being closed tightly. The present invention also has the following beneficial effects:

1. The sealing device of the present invention not only has a sealing function, but also has a cleaning function, which is a dual purpose, simple in structure, easy in operation, efficient and quick in cleaning, and greatly improves the cleaning efficiency.

2. The present invention utilizes turbulence to perform pollution removal work, and belongs to the application research of turbulence; by artificially pushing the sealing device to move back and forth quickly in the filter net, a series of local turbulence can be formed in the water flow channel between the sealing device and the filter net to clean the impurities and dirt on the filter net; when the sealing device is artificially pushed to move quickly in the filter net, a local high-pressure area A can be formed at the front end of the moving direction of the sealing device in the filter net, and at the same time, a local low-pressure area B can be formed at the rear end of the moving direction of the sealing device in the filter net, and the water in the high-pressure area quickly flows to the low-pressure area, thereby increasing the turbulence intensity in the water flow channel and forming a series of local strong turbulence. The impurities and dirt that are firmly adsorbed in the filter net are also easily separated from the filter net under the repeated action of the squeezing force and suction force of the strong turbulence, thereby enhancing the cleaning ability of the impurities and dirt on the filter net, especially in the holes of the filter net.

3. The diameter of the drainage hole of the present invention is 40-60% of the inner diameter of the filter screen. The diameter of the drainage hole is smaller than the diameter of the cleaning end. The water output is small during drainage, and the water consumption for one cleaning is small. The diameter of the cleaning handle gradually decreases from the exposed end to the end connected to the sealing device. When the sealing device cleans the middle and upper part of the filter screen, the amount of impurities and dirt is relatively small. At this time, the diameter of the cleaning handle at the drainage hole is larger, and the gap between the drainage hole and the cleaning handle is smaller, which can reduce the amount of water discharged from the drainage hole until the drainage is completely stopped. Therefore, the present invention can save water. A large amount of impurities and dirt are generally deposited at the bottom of the filter screen. When cleaning begins, the sealing device and the truncated cone-shaped sealing plug move inward along the cylindrical filter screen. At this time, the cleaning handle is smaller, and the gap between the drainage hole and the cleaning handle is larger, which facilitates a large amount of impurities and dirt to be discharged from the drainage hole in time.

4. During the cleaning and sewage discharge process, the filter can be used normally, and during the operation of the fluid system, the water pump can be kept running for online cleaning and sewage discharge, which will not affect the normal operation of the fluid system and is safe and reliable.

5. The drain hole on the end cover of the present invention is a truncated cone structure with a larger inner side and a smaller outer side. The drain hole on the end cover is made into a truncated cone structure with a larger inner side and a smaller outer side, which is more conducive to the sealing device and the truncated cone sealing plug to block the drain hole. The contact between the sealing device and the drain hole changes from line contact to surface contact, which can not only extend the service life of the truncated cone sealing gasket but also ensure the sealing effect. And the greater the water pressure, the tighter the sealing device is pressed, and the better the sealing effect.

6. When in the sealed state, the sealing device and the truncated cone-shaped sealing plug perform double sealing to ensure that the system does not leak. When cleaning, especially when pulling back the sealing device, since the connection between the truncated cone-shaped sealing plug and the cleaning handle is in a stepped shape, it is convenient to discharge impurities and dirt from the drain hole in time.

7. The magnets in the sealing device and the first magnetic ring on the outside of the end cover located around the drain hole attract each other by their opposite magnetic properties, which plays a role of auxiliary sealing. Even if the flow rate of the fluid in the upper part of the filter is too high, the local low pressure formed by the high flow rate in the upper part will not cause the sealing device and the drain hole to be loosely sealed and leak. At the same time, under the magnetic field of the first magnetic ring on the outside of the end cover, the magnets in the sealing device can be accurately positioned, automatically aligning the drain hole on the end cover with the sealing device, and completely blocking the drain hole, so that there will be no leakage or dripping due to the misalignment of the sealing device and the drain hole.

8. During cleaning, the surfaces of the first magnetic ring on the outside of the end cover and the second magnetic ring on the sewage hose with different magnetic poles fit together, so as to achieve the purpose of temporarily and quickly connecting the sewage hole and the sewage hose; and when connecting, the two magnetic rings do not need to be specially aligned, and the two magnetic rings can be combined into a technical solution of an automatic hole-aligning device. Even if they are not aligned during connection, the first magnetic ring and the second magnetic ring can automatically move relative to each other under the action of each other's magnetic field, so that the holes between the two magnetic rings are automatically aligned, so that impurities, dirt and sewage are discharged from the sewage hose during cleaning.

9. The sealing device of the present invention is a hollow sphere made of deformable polymer materials such as rubber or plastic. In addition to the sealing and cleaning functions, this deformable hollow sphere-shaped sealing device also has a certain effect of resisting water hammer and reducing water flow impact, which can reduce the noise of air-conditioning pipes and reduce environmental noise pollution. For large solid impurities and dirt that occasionally appear in the system, the deformable hollow sphere-shaped sealing device can also facilitate the smooth discharge of them from the drainage hole.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the overall structure of the present invention.

FIG. 2 is a state diagram of the present invention during cleaning and sewage discharge operation.

FIG. 3 is a schematic diagram of a structure in which a sealing device is provided with bristles around it.

FIG. 4 is a schematic diagram of the cleaning handle in FIG. 1 adopting a foldable structure.

FIG. 5 is a schematic structural diagram of the handle-free technical solution of the present invention.

FIG. 6 is a schematic diagram showing the sealing device in FIG. 5 when the sealing device is an ellipsoid.

In the figure, 1 is the inlet end, 2 is the filter housing, 3 is the filter screen, 4 is the sealing device, 5 is the drain hole, 6 is the end cover, 7 is the outlet end, 8 is the cleaning handle, 9 is the bristles, 10 is the cleaning end, 11 is the water flow channel, 12 is the truncated cone sealing plug, 13 is the magnet, 14 is the first magnetic ring, 15 is the second magnetic ring, 16 is the drain hose, and 17 is the truncated cone sealing gasket.

DETAILED DESCRIPTION

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

Embodiment 1

Referring to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, a fluid filter drain valve comprises a filter housing 2 and a cleaning handle 8. The filter housing 2 comprises three ports: an inlet port 1, an outlet port 7 and a cleaning port 10. The cleaning port 10 is blocked by an end cap 6, which is threadedly connected to the cleaning port 10 and has a drain hole 5. A cylindrical filter screen 3 is arranged inside the cleaning port 10, one end of the filter screen 3 extends between the inlet port 1 and the outlet port 7, and is used to separate the inlet port 1 and the outlet port 7. The other end of the filter screen 3 is connected to the cleaning port 10 near the end cap 6. A sealing device 4 for sealing the drain hole 5 is arranged inside the drain hole 5. The sealing device 4 can move inside the filter screen 3. There is a water flow channel 11 between the sealing device 4 and the filter screen 3. The sealing device 4 is not in direct contact with the filter screen 3, so as to avoid mutual wear between the sealing device 4 and the filter screen 3.

In the cleaning state, the sealing device 4 and the filter screen 3 work together to form local turbulence; in the non-cleaning state, the sealing device 4, the truncated cone-shaped sealing plug 12 and the end cover 6 are tightly fitted to play a sealing role. When the sealing device 4 moves forward quickly in the filter screen 3, a local high-pressure area is formed at the front end of the sealing device 4, and a local low-pressure area is formed at the rear end of the sealing device 4. A water flow channel 11 is formed between the sealing device 4 and the filter screen 3. Water in the high-pressure area quickly flows into the low-pressure area through the water flow channel 11, artificially forming local turbulence.

The drain hole 5 is in the shape of a truncated cone with a large inner portion and a small outer portion, which is more conducive to the sealing device 4 to block the drain hole 5. The contact between the sealing device 4, the truncated cone sealing plug 12 and the drain hole 5 is changed from line contact to surface contact, thereby ensuring the sealing effect and prolonging the service life of the truncated cone sealing pad 17. The truncated cone sealing plug 12 is made of stainless steel and other materials that are not easily deformed, while the truncated cone sealing pad 17 is made of rubber sealing materials and uses line contact or point contact. The sealing effect is very good in the short term, but after long-term use, the indentation of the truncated cone sealing pad 17 is easy to be permanently deformed and aged, reducing the sealing function. If the next connection position is slightly misaligned with the indentation position, water will leak, so the service life of the truncated cone sealing pad 17 depends on the permanent deformation aging time of the indentation. Surface contact can evenly distribute the pressure of the truncated cone sealing plug 12 to the truncated cone sealing pad 17, and the pressure per unit area is reduced. Similarly, the service life of the truncated cone sealing pad 17 depends on the permanent deformation aging time of the indentation. The pressure per unit area is reduced, which is conducive to prolonging the service life of the truncated cone sealing pad 17. A truncated cone-shaped sealing gasket 17 is pasted in the drain hole 5, and a truncated cone-shaped sealing plug 12 is glued or welded to the lower end of the sealing device 4. In the sealed state, the truncated cone-shaped sealing plug 12 just blocks the truncated cone-shaped drain hole 5 covering the truncated cone-shaped sealing gasket 17. Moreover, the special structural design of the truncated cone-shaped sealing plug 12, the truncated cone-shaped sealing gasket 17, and the truncated cone-shaped drain hole 5 makes the sealing and waterproof effect more reliable. The greater the pressure of the water system, the tighter the truncated cone-shaped sealing plug 12 is pressed on the drain hole 5, and the better the sealing effect. The sealing device 4 and the truncated cone-shaped sealing plug 12 have a dual role to ensure that the drain hole 5 does not leak.

The sealing device 4 is a sphere, the diameter of which is smaller than the inner diameter of the filter screen 3 and larger than the diameter of the drain hole 5; the diameter of the sphere is 70-90% of the inner diameter of the filter screen 3, the diameter of the drain hole 5 is 40-60% of the inner diameter of the filter screen 3, the diameter of the drain hole 5 is smaller than the diameter of the cleaning end 10, the water output is small during drainage, and the water consumption for one cleaning is less.

The first magnetic ring 14 is fixedly sleeved on the outer side of the end cover 6, and the magnet 13 is fixedly installed in the sealing device 4; the first magnetic ring 14 outside the end cover 6 and the magnet 13 in the sealing device 4 attract each other under the action of the magnetic field force, ensuring that the sealing device 4, the truncated cone-shaped sealing plug 12 and the drain hole 5 are tightly connected, and the truncated cone-shaped sealing plug 12 enters the truncated cone-shaped drain hole 5, which can realize automatic alignment and positioning, ensuring the accurate sealing position. One side of the first magnetic ring 14 is an N pole, and the other side is an S pole. The aperture in the middle of the first magnetic ring 14 is greater than or equal to the aperture of the drain hole 5 on the end cover 6; and the magnetic pole of the first magnetic ring 14 corresponds to the polarity of the magnet 13. If the N pole of the magnet 13 faces the direction of the cleaning handle 8, the S pole surface of the first magnetic ring 14 is close to the end cover 6, so that the N pole of the magnet 13 and the S pole of the first magnetic ring 14 attract each other. The magnet 13 in the sealing device 4 and the first magnetic ring 14 on the outside of the end cover 6 are attracted by opposite sexes, which plays a role of auxiliary sealing. Even if the fluid flow rate in the drain valve of the fluid filter is too high, the local low pressure formed by the high flow rate will not cause the sealing device 4 and the drain hole 5 to be leaking due to poor sealing. At the same time, under the magnetic field of the first magnetic ring 14 on the outside of the end cover 6, the magnet 13 in the sealing device 4 can be accurately positioned, automatically aligning the drain hole 5 on the end cover 6 with the sealing device 4, and completely blocking the drain hole 5, so that the sealing device 4 and the drain hole 5 will not be misaligned and leak or drip.

The sealing device 4 is a hollow sphere, and the sphere is made of a deformable rubber or plastic material. This deformable hollow spherical sealing device 4 can be deformed when the water pressure in the system changes suddenly, so as to have the function of resisting water hammer and reducing water wave impact, and can reduce the noise of the air-conditioning pipeline to a certain extent, and reduce environmental noise pollution. If the electric two-way valve of the fan coil unit is suddenly closed due to shutdown or other reasons, the water inlet pipe in the air-conditioning system will produce water hammer phenomenon. The present invention is installed at the front end of the electric two-way valve. When water hammer occurs, the deformable hollow sphere (i.e., the sealing device 4) will be deformed and reduced under the pressure of the water hammer, which plays a role in alleviating the impact of water flow, not only playing a certain protective role on the system, but also reducing the noise generated by the water hammer. The sealing device 4 is a hollow sphere made of deformable rubber or plastic material. When cleaning the filter 3, the sealing device 4 is pushed upward. If larger particles or larger volumes of impurities and dirt such as branches, leaves, and plastics are encountered between the filter 3 and the sealing device 4, the upward thrust of the cleaning handle 8 can deform the sphere of the sealing device 4 and partially reduce its volume, thereby allowing larger particles to fall from the gap between the filter 3 and the deformed sealing device 4 and finally be discharged from the drain hole 5.

The above-mentioned fluid filter drain valve also includes a cleaning handle 8, one end of the cleaning handle 8 passes through the drain hole 5 on the cleaning end 10 cover, and is fixedly connected (glued or welded) to the sealing device 4 and the truncated cone-shaped sealing plug 12, and the other end of the cleaning handle 8 is exposed. The diameter of the cleaning handle 8 is smaller than the diameter of the drain hole 5, and the gap between the cleaning handle 8 and the drain hole 5 is a channel for sewage flow.

The cleaning handle 8 is large at one end and small at the other end, and the diameter of the cleaning handle 8 gradually decreases from the exposed end to the end connected to the sealing device 4. This cleaning handle 8 with a large end and a small end can control the distance between the drainage hole 5 and the cleaning handle 8, which is not only conducive to the discharge of impurities and dirt, but also can reduce the amount of water discharged during the cleaning process, or even completely stop the drainage. In the drain valve of the fluid filter, most of the filtered impurities and dirt are deposited at the bottom of the filter screen 3. When cleaning begins, the sealing device 4 and the truncated cone-shaped sealing plug 12 overcome the magnetic force between the magnet 13 and the first magnetic ring 14 and move inward along the filter screen 3. At this time, the diameter of the cleaning handle 8 at the drain hole 5 is smaller, and the gap between the drain hole 5 and the cleaning handle 8 is larger, which is convenient for a large amount of impurities and dirt to be discharged from the drain hole 5; when the sealing device 4 cleans the middle and upper part of the filter screen 3, the amount of impurities and dirt is relatively small. At this time, the diameter of the cleaning handle 8 at the drain hole 5 is larger, and the gap between the drain hole 5 and the cleaning handle 8 is smaller, which can reduce the amount of water discharged from the drain hole 5; when the sealing device 4 reaches the top of the cylindrical filter screen 3, the discharge of impurities and dirt is the least. At this time, the cleaning handle 8 just blocks the drain hole 5, and the gap between the drain hole 5 and the cleaning handle 8 is extremely small, and the drain hole 5 stops draining.

The connection between the cleaning handle 8 and the truncated cone-shaped sealing plug 12 is in a step-like shape. In the cleaning state, especially when the sealing device 4 is pulled back, the step-like structure can bring large pieces or pieces of impurities and dirt such as branches, leaves, plastics, etc. out of the drainage hole 5. Even when the diameter of the impurities and dirt is larger than the diameter of the drainage hole 5, the large pieces or pieces of impurities and dirt such as branches, leaves, plastics, etc. can be crushed or deformed under the squeezing of the step-like mechanism and finally discharged through the drainage hole 5.

As shown in FIG3 , the sealing device 4 is surrounded by bristles 9. When the air conditioning system cleans the impurities and dirt on the filter 3, the bristles 9 are in contact with the inner side of the filter 3. When the cleaning handle 8 is pushed toward the top of the filter 3 along the direction of the filter 3, the bristles 9 brush off the impurities and dirt on the filter 3, and the impurities and dirt on the filter 3 can be cleaned in all directions, making the cleaning more convenient, clean and thorough.

As shown in FIG. 4 , the cleaning handle 8 can be made into a foldable shape. When not in the cleaning state, remove the drainage hose 16, fold the cleaning handle 8, press the end cover 6, and fix the cleaning handle 8 on the buckle of the end cover 6, so that the sealing device 4 is close to the end cover 6, and the truncated cone-shaped sealing plug 12 completely blocks the drainage hole 5, playing an auxiliary sealing role. When cleaning, the folded cleaning handle 8 is opened for cleaning.

The above-mentioned fluid filter drain valve also includes a drain hose 16, and a second magnetic ring 15 is provided at the joint of the drain hose 16. The second magnetic ring 15 and the first magnetic ring 14 outside the end cover 6 attract each other to ensure that the drain hose 16 is tightly connected to the drain hole 5. The drain hose 16 is made of nylon cloth or plastic film hose, which is convenient for cleaning operation. Impurities, dirt and sewage can be smoothly discharged into the water receiving bucket or directly into the water receiving tray of the fan coil. The material of the drain hose 16 is very light and thin, and the hand can also easily operate the cleaning handle 8 through the drain hose 16.

During cleaning, the first magnetic ring 14 on the outside of the end cover 6 and the surfaces of different magnetic poles of the second magnetic ring 15 on the sewage hose 16 are fitted together, so as to achieve the purpose of temporarily and quickly connecting the sewage hole 5 and the sewage hose 16; and when connecting, the two magnetic rings do not need to be specially aligned, only the two magnetic rings need to be brought close to each other, and the two magnetic rings can be combined into a technical solution of an automatic hole-aligning device. Even if they are not aligned during connection, it does not matter. The first magnetic ring 14 and the second magnetic ring 15 can automatically move relative to each other under the action of mutual magnetic field force, and the holes between the two magnetic rings are automatically aligned, so that impurities, dirt and sewage are discharged from the sewage hose 16 during cleaning.

Replacement method of sealing device 4: If sealing device 4 and cleaning handle 8 are damaged or the sealing effect is not good, and need to be repaired and replaced (not normal cleaning operation), first close the valve at the inlet end 1, ensure that there is no water flow in the fluid filter drain valve, and then close the valve at the outlet end 7, and the end cover 6 can be unscrewed along the thread direction, at this time, the cleaning handle 8 and sealing device 4 are taken out together, and the cleaning handle 8 and sealing device 4 can be taken out from the inside of the end cover 6, replaced with a new cleaning handle 8 and sealing device 4, and then the end cover 6 is covered on the cleaning end 10 along the thread direction, and the valve at the inlet end 1 is opened, and after ensuring that there is no water leakage between the end cover 6 and the cleaning end 10, the valve at the outlet end 7 is opened, and the replacement operation of the sealing device 4 can be completed. If the conventional Y-type filter is changed to the device of the present invention, it is simpler. When replacing the circulating water of the air conditioning system in the transition season, remove the end cover 6 of the Y-type filter, replace or clean the filter screen 3, and then install the sealing device 4 and the end cover 6 and other devices. You can also clean conventional Y-type filters one by one and replace them until all are replaced.

The working process of the present invention is as follows: when the air conditioning system is in operation, under the combined action of the deadweight of the sealing device 4 and the suction of the magnet 13 and the first magnetic ring 14, the lower end of the sealing device 4 is tightly connected to the end cover 6, and the truncated cone-shaped sealing plug 12 blocks the drain hole 5 to ensure that there is no water leakage; when the air conditioning system is cleaned, the drain hose 16 together with the second magnetic ring 15 is inserted into the cleaning handle 8, and the second magnetic ring 15 of the drain hose 16 is brought close to the first magnetic ring 14 on the end cover 6, and the second magnetic ring 15 is attracted together with the first magnetic ring 14. It is only necessary to push the sealing device 4 with the cleaning handle 8 through the drain hose 16, so that the sealing device 4 overcomes the magnetic force, and the truncated cone-shaped sealing plug 12 is separated from the truncated cone-shaped sealing pad 17, and moves along the inner side of the filter 3 until it is pushed into the top of the filter 3. The sides of the sealing device 4 cooperate with the filter 3 to form a movable and narrow water flow channel 11. Local turbulence is formed in the water flow channel 11, which can change the direction of the local water flow and enhance the impact of the local water flow on the impurities and dirt on the filter 3. The greater the impact of the local water flow, the better the impurities and dirt can be cleaned. The sealing device 4 does not need to directly contact the filter 3, and can wash the impurities and dirt on the filter 3 in all directions, making the cleaning more convenient, clean and thorough. After repeating this operation several times, the cleaning handle 8 can be slowly pulled out along the direction of the filter 3 until there is no more water leakage between the sealing device 4 and the end cover 6.

Select appropriate magnet 13 and first magnetic ring 14, so that the distance between magnet 13 and first magnetic ring 14 is about 1 cm, and the attraction between the two is between 0.05 kg and 0.5 kg. Similarly, select appropriate second magnetic ring 15, so that the attraction between the first magnetic ring 14 and the second magnetic ring 15 is about 0.1 kg to 2 kg, and the surface of the second magnetic ring 15 can also be pasted with an annular sealing gasket to protect the magnetic ring and prevent the magnetic ring from being damaged when the two magnetic rings are quickly pasted.

In an environment with a lot of fluid impurities, the filter 3 is often easy to absorb very solid impurities and dirt, and even fibrous impurities and dirt in the fluid are interspersed in the holes of the filter 3. It is difficult to clean it thoroughly with general cleaning methods. You can use the following methods for cleaning:

A method for cleaning and draining a fluid filter drain valve comprises the following steps:

S1: Open the cleaning handle 8 and place the connector of the drain hose 16 on the drain hole 5; the second magnetic ring 15 at the interface of the drain hose 16 and the first magnetic ring 14 on the end cover 6 of the cleaning end 10 are attracted by their magnetic opposites and are tightly adsorbed together, and under the action of the magnetic field force, the drain hole 5 between the second magnetic ring 15 and the first magnetic ring 14 will be automatically aligned, and the drain hole 5 will not be blocked.

S2: Hold the cleaning handle 8 through the sewage hose 16.

S3: Push the sealing device 4 to move forward in the filter 3 to clean the filter 3. The cleaning principle is to artificially create local turbulence in the water flow channel 11 between the sealing device 4 and the filter 3 to flush the filter 3. The sealing device 4 and the filter 3 are not in direct contact, and the filter 3 and the sealing device 4 will not be damaged. At the same time, impurities, dirt and a small amount of sewage are discharged. When cleaning, there is no need to open the end cover 6 of the cleaning end 10, and there is no need to take the filter 3 out of the cleaning end 10 for cleaning.

S4: After the sealing device 4 reaches the top of the filter 3, the cleaning handle 8 is withdrawn, and the filter 3 is also cleaned, and impurities, dirt and more sewage are discharged at the same time; the impurities and dirt on the filter 3 are flushed out of the drainage hole 5 by using the water pressure of the air conditioning system and the local turbulent force;

The cooperation of steps S3 and S4 can conveniently clean away the impurities and dirt deposited on the inner side of the filter screen 3 .

S5: Push the sealing device 4 quickly to make the sealing device 4 move forward quickly in the filter screen 3, strongly clean the filter screen 3, and discharge impurities, dirt and a small amount of sewage at the same time; when the sealing device 4 moves quickly in the filter screen 3, a local high-pressure area A can be formed at the front end of the moving direction of the sealing device 4 in the filter screen 3, exerting an extrusion force on the impurities and dirt in the holes of the filter screen 3, and at the same time, a local low-pressure area B is formed at the rear end of the moving direction of the sealing device 4 in the filter screen 3, artificially creating strong turbulence, and the impurities and dirt that are firmly adsorbed in the holes of the filter screen 3 are also easily separated from the holes of the filter screen 3 under the interaction of the extrusion force and the suction force.

S6: Quickly withdraw the cleaning handle 8 to clean the filter 3, while discharging impurities, dirt and more sewage; the cleaning principle and effect are similar to S5, one squeeze and one suck;

Steps S5 and S6 cooperate to clean the impurities and dirt deposited in the holes of the filter screen 3 and the impurities and dirt firmly adsorbed in the filter screen 3.

S7: Push the sealing device 4 to move forward in the filter 3. At the same time, rotate the cleaning handle 8 to drive the sealing device 4 to rotate back and forth in the filter 3, so as to powerfully clean the filter 3 and discharge impurities, dirt and a small amount of sewage at the same time. When the sealing device 4 rotates in the filter 3, it drives the fluid in the water flow channel 11 to rotate together, artificially forming a strong rotating turbulence, which can also bring out the fibrous impurities and dirt in the holes of the filter 3 while impacting the filter 3 at high speed, and discharge them with the sewage.

S8: withdraw the cleaning handle 8, and at the same time, rotate the cleaning handle 8, driving the sealing device 4 to reciprocate in the filter 3, so as to clean the filter 3 and discharge impurities, dirt and more sewage at the same time; the cleaning principle and effect are similar to S7;

Steps S7 and S8 can be combined to easily clean the impurities and dirt deposited on the inner side of the filter 3, especially the fibrous impurities and dirt. When the system is relatively clean and there are not many impurities and dirt, steps S5-S8 can be omitted. When the system is relatively dirty, steps S5-S8 can be combined and repeated in any combination to complete the cleaning and sewage discharge work.

S9: Pull the sealing device 4 to make the sealing device 4 press the drain hole 5; due to the interaction between the magnet 13 in the sealing device 4 and the first magnetic ring 14 on the outer side of the end cover 6 of the cleaning end 10, the sealing device 4 is tightly connected to the drain hole 5.

S10: Separate the second magnetic ring 15 and the first magnetic ring 14, and remove the sewage hose 16.

S11: Fold and fasten the cleaning handle 8.

S12: Confirm that there is no water leakage between the sealing device 4 and the drain hole 5, and the cleaning and draining work is completed.

Embodiment 2

As shown in FIG. 5 and FIG. 6 , a simplified fluid filter drain valve is shown, which is particularly suitable for use in a situation where there is a lack of operating space in a suspended ceiling.

The fluid filter drain valve comprises a Y-shaped filter housing 2, and the filter housing 2 comprises three ports: an inlet port 1, an outlet port 7 and a cleaning port 10. Inside the cleaning port 10, a filter screen 3 for separating the inlet port 1 and the outlet port 7 is provided.

A drain hole 5 is drilled on the end cover 6 of the cleaning end 10, and a sealing device 4 is placed inside the drain hole 5. The sealing device 4 is in the shape of a sphere or an ellipsoid, forming a drain valve with omitted elements.

The sealing material 4 is made of metal materials such as stainless steel; or the sealing material 4 is a composite structure with a polymer material on the outside and a metal material on the inside; or the sealing material 4 is a hollow sphere composed of a part of metal material and a part of polymer material. A magnet 13 is encapsulated inside the sealing material 4, and the magnet 13 can also be encapsulated at the lower end of the sealing material 4.

In the second embodiment of the present invention, the sealing device 4 is in the shape of a hollow sphere, the lower half of the sealing device 4 is made of stainless steel metal and the upper half is made of a deformable polymer material. In this way, it can deform during water hammer and ensure the sealing effect. A hole is drilled in the stainless steel hemisphere of the sealing device 4, and a magnet 13 is placed in it, and then fixed by condensation with an unsaturated resin. In this way, the magnet 13 is fixed in the sealing device 4 and close to the end cover side (i.e., the lower end of the sealing material 4).

A first magnetic ring 14 is fixed to the outside of the end cover 6 by gluing or clamping. One side of the first magnetic ring 14 is an N pole and the other side is an S pole. The aperture in the middle of the first magnetic ring 14 is greater than or equal to the aperture of the drain hole 5 on the end cover 6; and the magnetic pole of the first magnetic ring 14 corresponds to the polarity of the magnet 13. If the N pole of the magnet 13 is facing the drain hole 5, the S pole surface of the first magnetic ring 14 is close to the end cover 6, so that the N pole of the magnet 13 and the S pole of the first magnetic ring 14 are attracted to each other.

In addition, a sewage hose 16 is separately made, as shown in Figures 5 and 6. The sewage hose 16 is made of nylon cloth or plastic film hose, which is convenient for cleaning operations. Dirt and sewage can be smoothly discharged into the water receiving bucket or directly into the water receiving tray of the fan coil. The end of the sewage hose 16 is fixed with a second magnetic ring 15. The sewage hose 16 can be fixed to the outside of the second magnetic ring 15 with a pipe clamp or a nylon tie. The outside of the second magnetic ring 15 is an S pole, which is convenient for connecting with the N pole exposed outside the first magnetic ring 14.

As shown in Figures 5 and 6, the magnet 13 in the sealing device 4 and the first magnetic ring 14 bonded to the outer side of the end cover 6 around the drain hole 5 attract each other with the same polarity, and play a role of auxiliary sealing. Even if the fluid flow rate in the Y-type filter is too large, the local low pressure formed by the large flow rate will not cause the sealing device 4 and the drain hole 5 to be loose and leak.

At the same time, the magnet 13 and the first magnetic ring 14 are combined into a technical solution of an automatic positioning device: under the magnetic field attraction of the first magnetic ring 14 outside the end cover 6, the magnet 13 in the sealing device 4 is attracted, and the sealing device 4 is automatically aligned with the drainage hole 5 on the end cover 6, and the drainage hole 5 is completely blocked. The truncated cone structure of the drainage hole 5 and the sealing device 4 can accurately locate and navigate, and there will be no leakage or dripping due to the misalignment of the sealing device 4 (especially the elliptical sealing device 4) and the drainage hole 5.

The first magnetic ring 14 on the outside of the end cover 6 and the second magnetic ring 15 on the sewage hose 16, when cleaning, the surfaces of the two magnetic rings with different magnetic poles fit together, so as to achieve the purpose of temporarily and quickly connecting the sewage hole 5 and the sewage hose 16; and when connecting, the two magnetic rings do not need to be specially aligned. The two magnetic rings can be combined into a technical solution of an automatic hole-aligning device. Even if they are not aligned during connection, it does not matter. The first magnetic ring 14 and the second magnetic ring 15 can automatically move relative to each other under the action of each other's magnetic field, so that the holes between the two magnetic rings are automatically aligned, so that impurities, dirt and sewage are discharged from the sewage hose 16 during cleaning.

When the air conditioning system is running, under the combined effect of the deadweight of the sealing device 4 and the magnetic attraction of the magnet 13 and the first magnetic ring 14, the lower end of the sealing device 4 is tightly connected to the end cover 6, blocking the drain hole 5 to ensure that there is no water leakage; when the air conditioning system is cleaned, the second magnetic ring 15 of the drain hose 16 is close to the first magnetic ring 14 on the end cover 6, and the second magnetic ring 15 and the first magnetic ring 14 are attracted together. Just use a finger through the drain hose 16 to push the sealing device 4 through the drain hole 5, so that the sealing device 4 is separated from the magnetic force, and the truncated cone sealing plug 12 is separated from the truncated cone sealing pad 17, moving along the inner side of the filter 3, and pushing into the top of the Y-type filter 3. The sides of the sealing device 4 cooperate with the filter 3 to form a movable and narrow water flow channel 11. The distance between the sealing device 4 and the filter 3 is narrow, so local turbulence is formed in the water flow channel 11, which can change the direction of the local water flow and enhance the impact of the local water flow on the impurities and dirt on the filter 3. The local water flow has a greater impact force and can better clean the impurities and dirt. There is no need to directly contact the filter 3, and the impurities and dirt on the filter 3 can be washed in all directions, making the cleaning more convenient, clean and thorough. After repeating this operation several times, the finger can be slowly pulled out along the direction of the filter 3. The sealing device 4 automatically retreats to the vicinity of the end cover 6 under the push of hydraulic power, and then automatically aligns the position under the action of the magnetic field of the magnet 13 in the sealing device 4 and the first magnetic ring 14 on the end cover, and the sealing device 4 seals and blocks the drainage hole 5 until there is no water leakage between the sealing device 4 and the end cover 6.

In the existing sewage valve, whether it is an electric valve or a manual valve, the handle and the connecting rod are indispensable operating mechanisms, and the connecting rod needs to be driven directly or indirectly by the handle to control the sealing device to realize the opening and closing operation of the valve. However, the sewage valve of the technical solution of the second embodiment of the present invention omits the operating mechanisms such as the handle and the connecting rod, and the sealing device 4 does not need to be installed with the handle and the connecting rod. The sealing device 4 can also be directly operated by fingers to realize the opening and closing operation of the sewage valve.

Similarly, the drain valve of the technical solution of the second embodiment of the present invention does not need to install valves such as gate valves on the drain hole 5, does not need to use a brush 9, and does not need to directly contact the filter 3, and has a good online cleaning effect. As shown in Figures 5 and 6, when cleaning the filter 3, only by moving the sealing device 4, the size of the local water flow channel 11 between the filter 3 and the sealing device 4 is changed, and a local turbulence is formed between the filter 3 and the sealing device 4, which can change the direction of the local water flow and enhance the impact force of the local water flow on the impurities and dirt on the filter 3. The local water flow impacts the silt or other impurities and dirt on the filter 3 with a greater impact force, thereby achieving the purpose of cleaning the filter 3. In the sealed state, the sealing device 4 is sealed with the drain hole 5 to ensure that the system is watertight.

A method for cleaning and draining a Y-type fluid filter drain valve comprises the following steps:

S1: Put the connector of the sewage hose 16 on the sewage hole 5; the second magnetic ring 15 on the sewage hose 16 and the first magnetic ring 14 on the end cover 6 of the cleaning end 10 are attracted to each other by opposite charges and are tightly adsorbed together. Moreover, under the action of the magnetic field force, the openings between the two annular magnets of the second magnetic ring 15 and the first magnetic ring 14 will automatically align, and the sewage hole 5 will not be blocked;

S2: Through the drainage hose 16, the finger passes through the drainage hole 5 and contacts the sealing device 4;

S3: Push the sealing device 4 to move forward in the filter screen 3, clean the filter screen 3, and discharge impurities, dirt and a small amount of sewage at the same time; when cleaning, there is no need to open the end cover 6 of the cleaning end 10, and there is no need to take the filter screen 3 out of the cleaning end 10 for cleaning;

S4: After the sealing device 4 reaches the top, the finger is pulled out, and the sealing device 4 moves toward the drain hole 5 under the push of the hydraulic force, while cleaning the filter 3 and discharging impurities, dirt and more sewage; the impurities and dirt on the filter 3 are flushed out of the drain hole 5 by using the water pressure of the air conditioning system and the local turbulent force;

S5: Push the sealing device 4 quickly to make the sealing device 4 move forward quickly in the filter screen 3, and wash the filter screen 3 strongly, while discharging impurities, dirt and a small amount of sewage;

S6: Quickly pull out the finger, and the sealing device 4 moves toward the drain hole 5 under the push of hydraulic force, while cleaning the filter screen 3 and discharging impurities, dirt and more sewage;

S7: Move the sealing device 4 to make it close to the drain hole 5. Since the magnet 13 in the sealing device 4 interacts with the first magnetic ring 14 on the outer side of the end cover 6 of the cleaning end 10, the sealing device 4 is tightly connected to the drain hole 5.

S8: Confirm that there is no water leakage between the sealing device 4 and the drain hole 5;

S9: Separate the second magnetic ring 15 and the first magnetic ring 14, overcome the attraction between the two magnetic rings, remove the sewage hose 16, and complete the cleaning and sewage work.

In the technical solution of the second embodiment of the present invention, the sealing device 4 in FIG. 5 is spherical, while the sealing device 4 in FIG. 6 is elliptical. The shapes are different, but the structures and functions are the same. The sewage valve is composed of the sewage hole 5 and the sealing device 4. Compared with the conventional valve, the necessary technical features such as the handle and the connecting rod are omitted. Compared with the technical solution of the first embodiment of the present invention, the technical solution of the second embodiment omits the cleaning handle 8 and the truncated cone-shaped sealing plug 12. It is also not necessary to install a valve at the cleaning end 10, and it is not necessary to use a brush 9, nor is it necessary to directly contact the filter 3. Only the sealing device 4 is pushed with fingers to change the size of the local water flow channel 11 between the filter 3 and the sealing device 4, forming a local turbulence, which can change the direction of the local water flow and enhance the impact force of the local water flow on the impurities and dirt on the filter 3. The local water flow impacts the silt or other impurities and dirt on the filter 3 with a greater impact force, thereby achieving the purpose of cleaning the filter 3.

Any related technical content not described in the present invention can adopt or draw on the existing technology. The above-mentioned implementation mode does not constitute a limitation on the protection scope of the technical solution. Any modification, equivalent replacement and improvement made within the spirit and principle of the above-mentioned implementation mode shall be included in the protection scope of the technical solution.

Claims (10)

1. A fluid filter drain valve, comprising a filter housing, the filter housing comprising three ports: an inlet end, an outlet end and a cleaning end, the cleaning end being blocked by an end cover, characterized in that: a drain hole is provided on the end cover, a cylindrical filter screen is provided in the cleaning end, one end of the filter screen extends between the inlet end and the outlet end, for separating the inlet end and the outlet end, the other end of the filter screen is connected to the cleaning end near the end cover, a sealing device for sealing the drain hole is provided on the inner side of the drain hole, the sealing device can move inside the filter screen, a water flow channel is formed between the sealing device and the filter screen, the sealing device is artificially pushed to move back and forth quickly in the filter screen, and local turbulence is formed in the water flow channel between the sealing device and the filter screen; the sealing device moves quickly in the filter screen, a local high-pressure area is formed at the front end of the sealing device, and a local low-pressure area is formed at the rear end of the sealing device, thereby increasing the turbulence intensity in the water flow channel; The drain hole is in the shape of a truncated cone with a larger inner side and a smaller outer side. A truncated cone sealing gasket is pasted in the drain hole. A truncated cone sealing plug is provided at the lower end of the sealing device. In the sealed state, the truncated cone sealing plug just blocks the truncated cone drain hole covered with the truncated cone sealing gasket. 2. The fluid filter drain valve according to claim 1 is characterized in that: in the cleaning state, the sealing device and the filter screen work together to form local turbulence; in the non-cleaning state, the sealing device fits tightly with the drain hole on the end cover to play a sealing role. 3. The fluid filter drain valve according to claim 1 is characterized in that: the sealing device is a sphere, the diameter of the sphere is smaller than the inner diameter of the filter screen and larger than the diameter of the drain hole; the diameter of the sphere is 70-90% of the inner diameter of the filter screen, and the diameter of the drain hole is 40-60% of the inner diameter of the filter screen. 4. The fluid filter drain valve according to claim 1 is characterized in that: a first magnetic ring is fixed on the outside of the end cover, and a magnet is fixed inside the sealing device; the first magnetic ring outside the end cover and the magnet in the sealing device attract each other to ensure that the sealing device is tightly connected to the drain hole and that the sealing position is accurate. 5. The fluid filter drain valve according to claim 1 is characterized in that it also includes a cleaning handle, one end of the cleaning handle passes through the drain hole on the cleaning end cover and is fixedly connected to the truncated cone-shaped sealing plug, and the other end of the cleaning handle is exposed, the diameter of the cleaning handle is smaller than the diameter of the drain hole, and the gap between the cleaning handle and the drain hole is a channel for sewage flow; a step is formed between the cleaning handle and the truncated cone-shaped sealing plug. 6. The fluid filter drain valve according to claim 5, characterized in that the cleaning handle is large at one end and small at the other end, and the diameter of the cleaning handle gradually decreases from the exposed end to the end connected to the sealing device. 7. The fluid filter drain valve according to claim 1 is characterized in that: the sealing device is a hollow sphere, and the sphere is made of a deformable polymer material; or the sealing device is a hollow sphere, the lower part of the sealing device is made of metal material, and the upper part is made of a deformable polymer material. 8. The fluid filter drain valve according to claim 4 is characterized in that a second magnetic ring is provided at the joint of the drain hose, and the second magnetic ring and the first magnetic ring outside the end cover attract each other to ensure that the drain hose is tightly connected to the drain hole. 9. The fluid filter drain valve according to claim 1, characterized in that the sealing device is provided with bristles around it. 10. The fluid filter drain valve according to claim 1, characterized in that: the cleaning and draining operation method thereof comprises the following steps: S1: Open the cleaning handle and place the connector of the drain hose on the drain hole. The second magnetic ring at the drain hose interface and the first magnetic ring on the end cover of the cleaning end are attracted to each other by their magnetic opposites and are tightly adsorbed together. Moreover, under the action of the magnetic field force, the drain hole between the second magnetic ring and the first magnetic ring will automatically align, and the drain hole will not be blocked. S2: Hold the cleaning handle through the drain hose; S3: Push the sealing device to move forward in the filter to clean the filter. The cleaning principle is to artificially create local turbulence in the water flow channel between the sealing device and the filter to flush the filter. The sealing device and the filter are not in direct contact, so the filter and the sealing device will not be damaged. At the same time, impurities, dirt and a small amount of sewage are discharged. S4: After the sealing device reaches the top of the filter, the cleaning handle is pulled back to clean the filter and discharge impurities, dirt and more sewage at the same time; the impurities and dirt on the filter are flushed out of the drainage hole by using the water pressure of the air conditioning system and the local turbulent force; Steps S3 and S4 cooperate to clean the impurities and dirt deposited on the inner side of the filter screen; S5: Push the sealing device quickly to make it move forward quickly in the filter screen, wash the filter screen strongly, and discharge impurities, dirt and a small amount of sewage at the same time; when the sealing device moves quickly in the filter screen, a local high-pressure area A is formed at the front end of the moving direction of the sealing device in the filter screen, exerting an extrusion force on the impurities and dirt in the mesh of the filter screen, and at the same time, a local low-pressure area B is formed at the rear end of the moving direction of the sealing device in the filter screen, artificially creating strong turbulence, and the impurities and dirt firmly adsorbed in the mesh of the filter screen are also separated from the mesh of the filter screen under the interaction of the extrusion force and the suction force; S6: Quickly pull back the cleaning handle to clean the filter and discharge impurities, dirt and more sewage at the same time; the cleaning principle and effect are similar to S5, one squeeze and one suck; Steps S5 and S6 cooperate to clean the impurities and dirt deposited in the mesh of the filter and the impurities and dirt firmly adsorbed in the filter; S7: Push the sealing device to move forward in the filter. At the same time, rotate the cleaning handle to drive the sealing device to rotate back and forth in the filter, strongly clean the filter, and discharge impurities, dirt and a small amount of sewage at the same time. When the sealing device rotates in the filter, it drives the fluid in the water flow channel to rotate together, artificially forming a strong rotating turbulence, which impacts the filter at high speed and also brings out the fibrous impurities and dirt in the mesh of the filter and discharges them with the sewage. S8: Pull back the cleaning handle and rotate the cleaning handle at the same time, driving the sealing device to rotate back and forth in the filter screen, cleaning the filter screen and discharging impurities, dirt and more sewage at the same time; the cleaning principle and effect are similar to S7; Steps S7 and S8 cooperate to clean the impurities and dirt deposited on the inner side of the filter screen; when the system is relatively clean and there are not many impurities and dirt, steps S5-S8 are omitted; when the system is relatively dirty, steps S5-S8 are repeated in any combination to complete the cleaning and sewage discharge work; S9: Pull the sealing device to make it press the drain hole tightly; due to the interaction between the magnet in the sealing device and the first magnetic ring on the outer side of the end cover of the cleaning end, the sealing device is tightly connected to the drain hole; S10: Separate the second magnetic ring from the first magnetic ring and remove the sewage hose; S11: Fold and fasten the cleaning handle; S12: Confirm that there is no water leakage between the sealing device and the drain hole, and complete the cleaning and draining work.