Adjustable pressure reducing valve

Abstract

The invention discloses an adjustable pressure reducing valve, and relates to the technical field of pressure reducing valves, the adjustable pressure reducing valve comprises a valve body, a valve cover, a diaphragm, a valve rod, a spring and a valve core, the valve body is internally provided with a filter cavity, the filter cavity is internally provided with a filter assembly, the valve body is externally provided with an overhaul assembly connected with the filter assembly, and the overhaul assembly is internally provided with a power assembly; a connecting rod is arranged between the power assembly and the valve rod and detachably connected with the valve rod, a washing assembly connected with the power assembly is arranged on the lower portion of the filtering assembly, and a cleaning assembly is arranged at the position, below the valve element, of the outer portion of the connecting rod. The purposes of filtering, intercepting and collecting impurities in water flow can be achieved, the impurities attached to the lower surface of the filter screen can be removed, water permeability and normal filtering of the filter screen are guaranteed, the impurities can be prevented from being clamped between the valve element and the valve seat after the valve element and the valve seat are closed, normal work of the pressure reducing valve is guaranteed, and the service life of the pressure reducing valve is prolonged. And meanwhile, the overhaul, cleaning and maintenance work of corresponding parts is quicker and easier to operate.

Description

Technical Field

[0001] The invention relates to the technical field of pressure reducing valves, in particular to an adjustable pressure reducing valve. Background Art

[0002] The adjustable pilot-operated pressure reducing valve controls the opening of the opening and closing parts in the valve body to adjust the flow of the medium and reduce the pressure of the medium. At the same time, it uses the pressure behind the valve to adjust the opening of the opening and closing parts to keep the pressure behind the valve within a certain range. When the inlet pressure keeps changing, the outlet pressure is kept within the set range to protect the subsequent life and production equipment. The structure of the adjustable pilot-operated pressure reducing valve is usually composed of a valve body, a valve seat, a valve stem, a valve disc assembly, a valve cover, a diaphragm, a diaphragm seat and a spring.

[0003] The pressure reducing principle of the pilot-operated pressure reducing valve mainly includes two aspects, the pilot valve and the main valve. The pilot valve is a device that controls the opening of the main valve by sensing the pressure change of the main valve. When the pressure of the main valve changes, the pilot valve can sense it in time and adjust the opening of the main valve to achieve stable control of the fluid pressure. In this process, the pilot valve plays the role of a "pioneer", which can sense the pressure change in advance and make corresponding adjustments to ensure the normal operation of the main valve.

[0004] The main valve is the key component that truly plays a role in reducing pressure. The working principle of the main valve is to control the area of ​​the fluid passing through the valve body by adjusting the opening of the valve core, thereby reducing the fluid pressure. When the fluid pressure exceeds the set value, the main valve will automatically adjust the opening of the valve core to reduce the area of ​​the fluid passing through the valve body, thereby reducing the fluid pressure. When the fluid pressure is lower than the set value, the main valve can also adjust the opening of the valve core in time to increase the area of ​​the fluid passing through the valve body to ensure stable control of the fluid pressure.

[0005] Prior art CN 220749150 U discloses an intelligent pressure reducing valve, including a valve body, the valve body including a valve front end of the pressure reducing valve, a valve rear end of the pressure reducing valve and an upper cavity of the pressure reducing valve, a bypass pipeline for installing a bypass valve is provided between the valve front end and the valve rear end of the pressure reducing valve, and the valve body is also provided with an electric pilot valve driven by the pressure of the valve front end of the pressure reducing valve, and the pressure reducing valve is controlled by a control system, and the pressure reducing valve is adjusted by presetting the pressure of the valve rear end on the control system, and the presetting pressure of the valve rear end is adjusted in a set feedback time period to control the opening of the electric pilot valve, thereby intelligently controlling the opening of the pressure reducing valve, reducing the leakage rate of the community and the frequency of new pipe bursts, and ensuring the safety of municipal water supply, in addition, the opening of the bypass valve is adjustable, and the flow rate is small at night. By adjusting the opening of the bypass valve to control the pressure output of the rear end, a fixed pressure output at night can be achieved to prevent cross pressure;

[0006] However, after a period of operation, impurities will still enter the interior of the pressure reducing valve and the current adjustable pilot pressure reducing valve, and accumulate and adhere to the components inside the pressure reducing valve, which is bound to affect the normal operation of the valve and even the service life of the pressure reducing valve. For this reason, the pressure reducing valve needs to be inspected and maintained at regular intervals, but the maintenance cycle is relatively frequent, and the maintenance work is relatively cumbersome and complicated, resulting in a corresponding increase in the subsequent use cost. When the pressure reducing valve is closed, impurities may also adhere to the sealing surface of its valve core or valve seat, which will cause the impurities to be stuck between the valve core and the valve seat after the valve core is closed, causing the valve core to be loosely closed and unable to reduce static pressure. It is also easy to cause extrusion deformation of the valve core sealing ring of the wearing part, thereby causing damage to the valve core sealing ring, resulting in the use of the pressure reducing valve is still not worry-free enough. Summary of the invention

[0007] 1. Technical issues to be resolved

[0008] In view of the deficiencies of the prior art, the present invention provides an adjustable pressure reducing valve, which solves the problems raised in the background technology.

[0009] (II) Technical solution

[0010] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an adjustable pressure reducing valve, comprising a valve body, a valve cover, a diaphragm and a valve stem, wherein a partition is provided inside the valve body, the partition divides the inner cavity of the valve body into a water inlet cavity and a water outlet cavity, and a water through hole is opened on the partition, a valve seat is provided on the water through hole, a valve core is provided at the lower end of the valve stem, and the upper end is connected to the diaphragm, a partition is provided between the diaphragm and the valve body, a spring is provided between the partition and the valve core, a filter cavity is provided at the lower part of the water through hole, a filter assembly is provided inside the filter cavity, and an inspection assembly connected to the filter assembly is provided outside the valve body;

[0011] A power assembly is provided inside the inspection assembly, a connecting rod is provided between the power assembly and the valve stem, the connecting rod and the valve stem are detachably connected, a flushing assembly connected to the power assembly is provided at the bottom of the filter assembly, and a cleaning assembly is provided outside the connecting rod below the valve core.

[0012] Preferably, the filter assembly includes a filter screen and a collecting cylinder whose outer diameter is the same as the inner diameter of the filter chamber. The collecting cylinder is inserted into the interior of the filter chamber, and the upper and lower ends of the collecting cylinder are both open. The filter screen is installed at the lower opening of the collecting cylinder, and a collecting groove with an annular cavity is provided on the circumferential wall of the collecting cylinder. The upper end of the collecting groove is closed and the lower end is open. A filter hole connected to the cavity of the collecting groove is provided on the inner wall of the collecting cylinder.

[0013] Preferably, a retaining ring is provided at the lower opening of the collecting tank. The retaining ring is made of soft material, and the inner ring of the retaining ring is connected to the inner wall of the collecting tank close to the filter hole, and a gap is left between the outer ring of the retaining ring and the inner wall of the collecting tank away from the filter hole.

[0014] Preferably, the inspection assembly includes an inspection port arranged on the outside of the valve body and connected to the filter chamber, and a sealing cover threadedly connected to the outside of the inspection port, the inner bottom wall of the sealing cover is equipped with a sealing gasket abutting the inspection port, and a sealing plug is provided inside the sealing cover, the sealing plug is sealingly inserted into the inside of the inspection port, and a support rod is connected between the sealing plug and the filter assembly.

[0015] Preferably, the power assembly includes a water storage chamber opened on the sealing plug and a diaphragm connected to the connecting rod, the upper portion of the water storage chamber is open, the diaphragm is arranged at the upper opening of the water storage chamber, and the circumferential outer edge of the diaphragm is connected to the circumferential inner wall of the water storage chamber.

[0016] Preferably, the connecting rod passes through the filter screen, and the connecting rod and the filter screen are slidingly sealed and connected, a water hole is opened inside the connecting rod, the water hole is connected to the inside of the water storage chamber, and a one-way valve is provided outside the connecting rod, the height of the one-way valve is not lower than the filter assembly, and the one-way valve is connected to the water hole.

[0017] Preferably, the flushing assembly includes a plurality of soft first water outlet pipes and a plurality of first one-way valve nozzles, the plurality of first water outlet pipes are divergently arranged on the periphery of the connecting rod, and one end of the first water outlet pipe is connected to the diaphragm, and the other end extends to the lower part of the filter assembly, and the plurality of first one-way valve nozzles are respectively connected one by one to one end of the plurality of first water outlet pipes close to the filter assembly, and the first one-way valve nozzles are connected to the water storage chamber through the first water outlet pipes.

[0018] Preferably, the cleaning assembly includes a plurality of hard second water outlet pipes and a plurality of second one-way valve nozzles, the plurality of second water outlet pipes are divergently arranged on the periphery of the connecting rod, and one end of the second water outlet pipe is connected to the connecting rod, and the other end extends to the lower side of the sealing surface of the valve core, and the plurality of second one-way valve nozzles are respectively installed at one end of the second water outlet pipe close to the sealing surface of the valve core, and the second one-way valve nozzles are connected to the water hole through the second water outlet pipe.

[0019] Preferably, a stud is provided at the upper end of the connecting rod, and a connecting hole is opened at the lower end of the valve stem. The inner diameter of the connecting hole is not less than the outer diameter of the stud. The stud is inserted into the connecting hole, and a nut is provided inside the connecting hole, and the nut is threadedly connected to the stud.

[0020] Preferably, a first conduit is connected between the water inlet chamber and the valve cover, and a needle valve and a filter are sequentially provided on the first conduit from one end close to the valve body to one end close to the valve cover, and a second conduit is connected between the water outlet chamber and the valve cover, and a guide valve and a ball valve are sequentially provided on the second conduit from one end close to the valve cover to one end close to the valve body.

[0021] (III) Beneficial effects

[0022] Compared with the prior art, the present invention provides an adjustable pressure reducing valve, which has the following beneficial effects:

[0023] 1. Before the water flows through the valve core in the valve body, it will first enter the filter chamber. In the process of water flowing through the filter chamber, the filter component can filter and intercept and collect impurities in the water flow, thereby preventing impurities in the water from entering the water outlet chamber and attaching and accumulating on other important components such as the valve core and valve seat, avoiding affecting the normal operation of the valve, and to a certain extent extending the service life of various components and the pressure reducing valve as a whole. In addition, by improving the protection capability of the pressure reducing valve, the frequency of later inspection and maintenance can also be reduced.

[0024] 2. In the process of the pressure reducing valve adjusting the pressure behind the valve, the valve stem will not only drive the valve core to move, but also drive the power component through the connecting rod, and further drive the flushing component to flush and clean the lower surface of the filter, so as to remove impurities attached to the lower surface of the filter, ensure the water permeability and normal filtration of the filter, and the impurities flushed from the lower surface of the filter can be directly collected in the collection tank with the flushing water flow, thereby effectively avoiding affecting the normal operation of the filter component.

[0025] 3. In the process of closing between the valve core and the valve seat, impurities attached to the lower surface of the sealing ring can also be washed away, so as to prevent impurities from being stuck between the valve core and the valve seat after they are closed, thereby effectively preventing the valve core and the valve seat from being loosely closed, ensuring the normal operation of the pressure reducing valve. At the same time, the removal of impurities can also prevent the sealing ring and the valve seat from being squeezed and deformed, thereby protecting the sealing ring and the valve seat to a certain extent, and reducing their failure rate to a certain extent, making the use of the pressure reducing valve more worry-free.

[0026] 4. Moreover, through the setting of the inspection component, the disassembly and assembly of the filter component, the power component, the flushing component and the cleaning component can be made more convenient, so that the inspection, cleaning and maintenance of the corresponding components will be faster and easier to operate, thereby reducing the later maintenance and use costs of the pressure reducing valve, making the pressure reducing valve easier to use, thereby improving the practicality and ease of use of the pressure reducing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a front view cross-sectional structural schematic diagram of the present invention;

[0028] Figure 2 It is a schematic diagram of a three-dimensional partial structure of the present invention;

[0029] Figure 3 This is a bottom-up stereoscopic structural schematic diagram of the filter assembly of the present invention when the retaining ring is not installed;

[0030] Figure 4 It is a top view of the three-dimensional structure of the filter assembly of the present invention;

[0031] Figure 5 This is a bottom-up stereoscopic structural schematic diagram of the filter assembly of the present invention when the retaining ring is installed;

[0032] Figure 6 It is a schematic diagram of the front cross-sectional structure of the filter assembly of the present invention;

[0033] Figure 7 It is a schematic diagram of a partial structure of the present invention in a front view and a cross-section;

[0034] Figure 8 For the present invention Figure 7 The enlarged structural diagram at A in the middle;

[0035] Fig. 9 It is a front view cross-sectional structural schematic diagram of the internal components of the valve body of the present invention;

[0036] Fig.10 It is a bottom-up stereoscopic structural schematic diagram of the filter assembly and the flushing assembly of the present invention;

[0037] Fig.11 It is a schematic diagram of the exploded three-dimensional structure of the connection between the valve stem and the connecting rod of the present invention when viewed from above.

[0038] In the figure: 1, valve body; 101, interlayer; 102, water inlet chamber; 103, water outlet chamber; 104, water hole; 105, filter chamber; 2, valve cover; 3, diaphragm; 4, valve stem; 401, connecting hole; 5, spring; 6, filter assembly; 601, filter screen; 602, collection tube; 603, collection tank; 604, filter hole; 605, retaining ring; 7, maintenance assembly; 701, maintenance port; 702, sealing cover; 703, sealing plug; 704, sealing gasket; 8, power assembly; 801, water storage chamber; 8 02, diaphragm; 9, flushing assembly; 901, first water outlet pipe; 902, first one-way valve nozzle; 10, cleaning assembly; 1001, second water outlet pipe; 1002, second one-way valve nozzle; 11, valve core; 1101, sealing ring; 12, valve seat; 13, partition; 14, connecting rod; 1401, water hole; 15, support rod; 16, one-way valve; 17, nut; 18, stud; 19, first conduit; 20, needle valve; 21, filter; 22, second conduit; 23, guide valve; 24, ball valve. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0043] Embodiment 1

[0044] The present invention provides an adjustable pressure reducing valve: Figure 1As shown, the valve body 1 comprises a valve cover 2, a diaphragm 3, a valve stem 4, a spring 5 and a valve core 11. A partition 101 is provided inside the valve body 1. The partition 101 divides the inner cavity of the valve body 1 into a water inlet cavity 102 and a water outlet cavity 103. A water through hole 104 for connecting the water inlet cavity 102 with the water outlet cavity 103 is provided on the partition 101. A valve seat 12 adapted to the valve core 11 is provided on the water through hole 104. The valve core 11 is installed on the valve The lower end of the stem 4 and the outside of the valve core 11 are equipped with a sealing ring 1101 that can cooperate with the valve seat 12 for sealing, the upper end of the valve stem 4 is connected to the diaphragm 3, the valve cover 2 is installed on the outside of the valve body 1, and the diaphragm 3 is installed between the valve body 1 and the valve cover 2, a partition 13 is provided between the diaphragm 3 and the valve body 1, the valve stem 4 passes through the partition 13, and the valve stem 4 and the partition 13 are connected in a sliding sealing manner, and the spring 5 is connected between the partition 13 and the valve core 11;

[0045] A first conduit 19 is connected between the water inlet chamber 102 and the valve cover 2, and a needle valve 20 and a filter 21 are sequentially installed on the first conduit 19 from one end close to the valve body 1 to one end close to the valve cover 2. A second conduit 22 is connected between the water outlet chamber 103 and the valve cover 2, and a pilot valve 23 and a ball valve 24 are sequentially installed on the second conduit 22 from one end close to the valve cover 2 to one end close to the valve body 1.

[0046] like Figure 1 and Figure 2 As shown, a filter chamber 105 is provided at the lower part of the water hole 104, a filter assembly 6 is provided inside the filter chamber 105, and a maintenance assembly 7 connected to the filter assembly 6 is provided outside the valve body 1;

[0047] like Figure 3 and Figure 7 As shown, the filter assembly 6 includes a filter screen 601 and a collection cylinder 602 with an outer diameter that is the same as the inner diameter of the filter chamber 105. The collection cylinder 602 is plugged into the interior of the filter chamber 105, and the upper and lower ends of the collection cylinder 602 are both open. The filter screen 601 is installed at the lower end opening of the collection cylinder 602, and a collection groove 603 with an annular cavity is opened on the circumferential wall of the collection cylinder 602. The upper end of the collection groove 603 is closed and the lower end is open. In order to facilitate the impurities on the filter screen 601 to enter the interior of the collection groove 603, the filter screen 601 is The height of the lower surface is not higher than the lower opening of the collecting tank 603, and the inner wall of the collecting tube 602 is provided with a filter hole 604 connected to the cavity of the collecting tank 603, so that the water entering the collecting tube 602 can be discharged through the filter hole 604, and a retaining ring 605 is provided at the lower opening of the collecting tank 603. The retaining ring 605 is made of soft material, such as rubber and silicone, and the inner ring of the retaining ring 605 is connected to the inner wall of the collecting tank 603 on the side close to the filter hole 604, and a gap is left between the outer ring of the retaining ring 605 and the inner wall of the collecting tank 603 on the side away from the filter hole 604;

[0048] like Figure 7 and Figure 8 As shown, the inspection assembly 7 includes an inspection port 701 provided on the outside of the valve body 1 and communicating with the filter chamber 105, and a sealing cover 702 threadedly connected to the outside of the inspection port 701. The lower surface of the sealing cover 702 is integrally provided with a quadrangular prism or a hexagonal prism protrusion, which can be conveniently twisted and disassembled by a wrench. A sealing gasket 704 abutting against the inspection port 701 is installed on the inner bottom wall of the sealing cover 702, and a sealing plug 703 is provided inside the sealing cover 702. The sealing plug 703 is sealingly plugged into the inside of the inspection port 701. After the sealing cover 702 is screwed onto the external thread on the outside of the inspection port 701 through the internal thread, the sealing plug 703 will also be inserted into the inside of the inspection port 701, thereby plugging the sealing plug 703. Into the inspection port 701, together with the sealing gasket 704, the sealing of the inspection port 701 can be effectively guaranteed, and a support rod 15 is connected between the sealing plug 703 and the filter assembly 6, and the upper and lower ends of the support rod 15 are respectively connected to the filter screen 601 and the sealing plug 703 by bolts, and the lower end edge of the collecting tube 602 is provided with a groove compatible with the support rod 15. After the upper end of the support rod 15 is fixed to the filter screen 601 by bolts, the support rod 15 is just inserted into the groove at the lower end of the collecting tube 602, thereby improving the connection stability between the support rod 15 and the collecting tube 602, thereby improving the connection stability between the support rod 15 and the entire filter assembly 6, and ensuring the quality between the corresponding components.

[0049] Working principle: When the pressure reducing valve is working, water flows into the water inlet chamber 102 through the inlet end of the valve body 1, and then flows to the valve core 11 through the filter chamber 105 and the water through hole 104 respectively, and the valve core 11 is pushed upward by the water pressure, so that the valve core 11 moves upward and separates from the valve seat 12. At this time, the water flows into the water outlet chamber 103 through the gap between the valve core 11 and the valve seat 12, and finally flows out through the outlet end of the valve body 1. In the process of water flowing through the filter chamber 105, the filter net 601 will intercept impurities to achieve the purpose of filtering the water flow, and the impurities can be flushed into the collection tank 603 for collection under the flushing of the water flow. In this process, the flushing force of the water flow can flush the retaining ring 605, causing it to undergo a certain elastic deformation and This increases the width of the gap between the outer ring of the retaining ring 605 and the inner wall of the collecting groove 603, so that impurities can enter the deep part of the collecting groove 603, and the water flow entering the collecting groove 603 can flow out to the water hole 104 through the filter hole 604, and at the same time, the impurities can be trapped in the collecting groove 603, thereby achieving the purpose of filtering and intercepting and collecting impurities in the water flow, thereby preventing impurities in the water from entering the water outlet cavity 103 and adhering to and accumulating on other important components such as the valve core 11 and the valve seat 12. When the valve core 11 and the valve seat 12 are closed to close the pressure reducing valve, the deformed retaining ring 605 can return to its original shape through its own rebound force, thereby sealing the lower end opening of the collecting groove 603 to a certain extent, and effectively preventing the impurities inside it from flowing out;

[0050] When maintenance is needed, the quadrangular or hexagonal protrusions on the lower surface of the sealing cover 702 are twisted with a wrench to unscrew the sealing cover 702 from the inspection port 701. During the unscrewing process, the sealing plug 703 will gradually separate from the inspection port 701 along with the sealing cover 702. At the same time, the sealing plug 703 will gradually pull the filter assembly 6 downward from the filter chamber 105 through the support rod 15 until the sealing cover 702 is separated from the inspection port 701. The sealing cover 702 can then be pulled downward to pull the filter assembly 6 out of the valve body 1 through the inspection port 701, thereby achieving the purpose of disassembling the filter assembly 6, and then it can be inspected and cleaned. After the inspection and cleaning are completed, it can be put back in place. Therefore, the inspection and cleaning of the filter assembly 6 will also be more convenient, quick and easy to operate.

[0051] Embodiment 2

[0052] The present invention provides an adjustable pressure reducing valve: Figure 1 and Figure 2 As shown, a power assembly 8 is provided inside the maintenance assembly 7, a connecting rod 14 is provided between the power assembly 8 and the valve stem 4, the connecting rod 14 and the valve stem 4 are detachably connected, and a flushing assembly 9 connected to the power assembly 8 is provided at the lower part of the filter assembly 6;

[0053] like Figure 7 and Figure 8 As shown, the power assembly 8 includes a water storage chamber 801 opened on the sealing plug 703 and a diaphragm 802 connected to the connecting rod 14. The upper part of the water storage chamber 801 is open, and the diaphragm 802 is arranged at the upper opening of the water storage chamber 801, and the circumferential outer edge of the diaphragm 802 is sealed and fixedly connected to the circumferential inner wall of the water storage chamber 801.

[0054] like Fig. 9 As shown, the connecting rod 14 passes through the filter screen 601, and the connecting rod 14 and the filter screen 601 are slidably sealed and connected. A water hole 1401 is provided inside the connecting rod 14, and the water hole 1401 is communicated with the inside of the water storage chamber 801. A one-way valve 16 is provided outside the connecting rod 14, and the one-way valve 16 is communicated with the water hole 1401. The function of the one-way valve 16 is to allow water to flow into the water hole 1401 through the one-way valve 16, while the water in the water hole 1401 cannot be discharged from the one-way valve 16. The one-way valve 16 is located above the filter screen 601, so that the water entering the water hole 1401 through the one-way valve 16 can be cleaned;

[0055] like Fig. 9 and Fig.10 As shown, the flushing assembly 9 includes four soft first water outlet pipes 901 and four first one-way valve nozzles 902. The material of the first water outlet pipes 901 can be a rubber tube or a corrugated tube. The four first water outlet pipes 901 are divergently arranged on the periphery of the connecting rod 14, and one end of the first water outlet pipe 901 is connected to the diaphragm 802, and the other end extends to the lower part of the filter assembly 6. The four first one-way valve nozzles 902 are respectively installed one by one on the four first water outlet pipes 901 near the filter assembly 6. One end, and the first one-way valve nozzle 902 is connected to the water storage chamber 801 through the first water outlet pipe 901, the spray direction of the first one-way valve nozzle 902 is toward the lower end opening of the collecting tank 603, and the function of the first one-way valve nozzle 902 is to prevent the water flow from entering the water hole 1401 through the first one-way valve nozzle 902, while the water in the water hole 1401 can be sprayed outward from the first one-way valve nozzle 902. The one-way valve nozzle is a prior art, and its specific working principle will not be repeated here.

[0056] Working principle: When the pressure behind the pressure reducing valve changes, that is, when the water pressure on the side of the valve body 1 close to the water outlet chamber 103 changes, the pilot valve 23 can detect it and cooperate with the diaphragm 3 and the spring 5 to drive the valve stem 4 and the valve core 11 to move, and thereby adjust the distance between the valve core 11 and the valve seat 12, so as to achieve the purpose of regulating the pressure behind the pressure reducing valve. The specific process of regulating the pressure behind the valve is a prior art and will not be repeated in this article.

[0057] In the process of pressure regulation, when the diaphragm 3 and the spring 5 drive the valve stem 4 and the valve core 11 to move, the valve stem 4 will also pull or press the diaphragm 802 through the connecting rod 14, and cause the diaphragm 802 to undergo a certain deformation, thereby changing the volume of the cavity between the diaphragm 802 and the water storage chamber 801. When the valve stem 4 pulls the diaphragm 802 upward through the connecting rod 14, the volume of the cavity between the diaphragm 802 and the water storage chamber 801 becomes larger. At this time, a certain negative pressure is generated in the cavity, and water is pumped between the diaphragm 802 and the water storage chamber 801 through the one-way valve 16 and the water hole 1401 to achieve the purpose of water storage. When the valve stem 4 presses the diaphragm 802 downward through the connecting rod 14, the negative pressure is increased. 2, the volume of the cavity between the diaphragm 802 and the water storage chamber 801 becomes smaller, and the water previously stored is sprayed outward through the first water outlet pipe 901 and the first one-way valve nozzle 902 in sequence, and the water flow sprayed by the four first one-way valve nozzles 902 is sprayed outward toward the lower surface of the filter mesh 601 in a divergent shape, thereby flushing and cleaning the lower surface of the filter mesh 601, and thereby removing impurities attached to the lower surface of the filter mesh 601, and the first one-way valve nozzle 902 just sprays water toward the lower end opening of the collecting tank 603, so that the impurities flushed from the lower surface of the filter mesh 601 can directly enter the collecting tank 603 with the flushing water flow for collection.

[0058] Embodiment 3

[0059] The present invention provides an adjustable pressure reducing valve: Figure 1 and Figure 2 As shown, a cleaning assembly 10 is provided outside the connecting rod 14 and below the valve core 11;

[0060] like Fig. 9 and Fig.11 As shown, the cleaning component 10 includes six hard second water outlet pipes 1001 and six second one-way valve nozzles 1002. The six second water outlet pipes 1001 are divergently arranged on the outer periphery of the connecting rod 14, and one end of the second water outlet pipe 1001 is connected to the connecting rod 14, and the other end extends to the lower side of the sealing ring 1101 on the valve core 11. The six second one-way valve nozzles 1002 are respectively installed on one end of the second water outlet pipe 1001 close to the sealing ring 1101. The second one-way valve nozzle (1002) is connected to the water hole (1401) through the second water outlet pipe (1001), and the function of the second one-way valve nozzle 1002 is to prevent the water flow from entering the water hole 1401 through the second one-way valve nozzle 1002, while the water in the water hole 1401 can be sprayed outward from the second one-way valve nozzle 1002, and the water spraying direction of the second one-way valve nozzle 1002 is toward the sealing ring 1101;

[0061] A stud 18 is provided at the upper end of the connecting rod 14, and a connecting hole 401 is opened at the lower end of the valve stem 4. The inner diameter of the connecting hole 401 is not less than the outer diameter of the stud 18. The stud (18) is inserted into the connecting hole (401), and a nut 17 is provided inside the connecting hole 401, and the nut 17 is threadedly connected to the stud 18.

[0062] Working principle: When the valve stem 4 presses the moving diaphragm 802 downward through the connecting rod 14, the valve stem 4 will also drive the valve core 11 to approach the valve seat 12, so that there is a tendency for the moving valve core 11 and the valve seat 12 to close. In this process, in addition to being ejected outward through the first one-way valve nozzle 902, the water between the diaphragm 802 and the water storage chamber 801 will also be ejected outward through the water hole 1401, the second water outlet pipe 1001 and the second one-way valve nozzle 1002 in sequence, and the water flow ejected through the six second one-way valve nozzles 1002 is divergently ejected outward toward the valve core 11. The lower surface of the upper sealing ring 1101 is flushed away, thereby washing away impurities attached to the lower surface of the sealing ring 1101, and preventing impurities from being stuck between the valve core 11 and the valve seat 12 after they are closed, thereby effectively preventing the valve core 11 and the valve seat 12 from being loosely closed, ensuring the normal operation of the pressure reducing valve, and at the same time, the removal of impurities can also prevent the sealing ring 1101 and the valve seat 12 from being squeezed and deformed, thereby protecting the sealing ring 1101 and the valve seat 12 to a certain extent, and reducing their failure rate to a certain extent, making the use of the pressure reducing valve more worry-free;

[0063] Moreover, with the arrangement of the nut 17 and the stud 18, during the process of disassembling the filter assembly 6 by twisting the sealing cover 702, the sealing cover 702 will also drive the connecting rod 14 to rotate synchronously with the sealing cover 702 through the sealing plug 703, the support rod 15 and the filter screen 601, and the power assembly 8, the flushing assembly 9 and the cleaning assembly 10 will also rotate synchronously, and the connecting rod 14 will drive the stud 18 to rotate synchronously on the nut 17. Therefore, during the process of unscrewing the sealing cover 702 from the inspection port 701, the stud 18 will also gradually separate from the nut 17, and thereby separate the connecting rod 14 from the valve stem 4. Therefore, the power assembly 8, the flushing assembly 9 and the cleaning assembly 10 can also be removed through the inspection assembly 7 to facilitate the inspection, cleaning and maintenance of the corresponding components.

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

Claims

1. An adjustable pressure reducing valve, comprising a valve body (1), a valve cover (2), a diaphragm (3) and a valve stem (4), wherein a partition (101) is provided inside the valve body (1), the partition (101) divides the inner cavity of the valve body (1) into a water inlet cavity (102) and a water outlet cavity (103), and a water through hole (104) is provided on the partition (101), and a valve seat (12) is provided on the water through hole (104), a valve core (11) is provided at the lower end of the valve stem (4), and the upper end is connected to the diaphragm (3), a partition (13) is provided between the diaphragm (3) and the valve body (1), and a spring (5) is provided between the partition (13) and the valve core (11), characterized in that: A filter chamber (105) is provided at the lower part of the water through hole (104), a filter assembly (6) is provided inside the filter chamber (105), and an inspection assembly (7) connected to the filter assembly (6) is provided outside the valve body (1); A power assembly (8) is provided inside the inspection assembly (7), a connecting rod (14) is provided between the power assembly (8) and the valve stem (4), and the connecting rod (14) and the valve stem (4) are detachably connected. A flushing assembly (9) connected to the power assembly (8) is provided at the bottom of the filter assembly (6), and a cleaning assembly (10) is provided outside the connecting rod (14) and below the valve core (11).

2. The adjustable pressure reducing valve according to claim 1, characterized in that: The filter assembly (6) comprises a filter screen (601) and a collection tube (602) having an outer diameter that is the same as the inner diameter of the filter chamber (105); the collection tube (602) is inserted into the interior of the filter chamber (105), and both upper and lower ends of the collection tube (602) are open; the filter screen (601) is installed at the lower opening of the collection tube (602), and a collection groove (603) having an annular cavity is provided on the circumferential wall of the collection tube (602); the upper end of the collection groove (603) is closed, and the lower end is open; and a filter hole (604) communicating with the cavity of the collection groove (603) is provided on the inner wall of the collection tube (602).

3. The adjustable pressure reducing valve according to claim 2, characterized in that: A retaining ring (605) is provided at the lower opening of the collecting groove (603). The retaining ring (605) is made of a soft material, and the inner ring of the retaining ring (605) is connected to the inner wall of the collecting groove (603) on the side close to the filter hole (604), and a gap is left between the outer ring of the retaining ring (605) and the inner wall of the collecting groove (603) on the side away from the filter hole (604).

4. The adjustable pressure reducing valve according to claim 1, characterized in that: The inspection assembly (7) comprises an inspection port (701) arranged outside the valve body (1) and communicating with the filter chamber (105), and a sealing cover (702) threadedly connected to the outside of the inspection port (701); a sealing gasket (704) abutting against the inspection port (701) is installed on the inner bottom wall of the sealing cover (702); a sealing plug (703) is provided inside the sealing cover (702); the sealing plug (703) is sealingly inserted into the inside of the inspection port (701), and a support rod (15) is connected between the sealing plug (703) and the filter assembly (6).

5. The adjustable pressure reducing valve according to claim 4, characterized in that: The power assembly (8) comprises a water storage chamber (801) opened on a sealing plug (703) and a diaphragm (802) connected to a connecting rod (14); the upper portion of the water storage chamber (801) is open; the diaphragm (802) is arranged at the upper opening of the water storage chamber (801); and the circumferential outer edge of the diaphragm (802) is connected to the circumferential inner wall of the water storage chamber (801).

6. The adjustable pressure reducing valve according to claim 5, characterized in that: The connecting rod (14) passes through the filter screen (601), and the connecting rod (14) and the filter screen (601) are slidably sealed and connected. A water hole (1401) is provided inside the connecting rod (14), and the water hole (1401) is connected to the inside of the water storage chamber (801). A one-way valve (16) is provided outside the connecting rod (14), and the height of the one-way valve (16) is not lower than that of the filter assembly (6), and the one-way valve (16) is connected to the water hole (1401).

7. The adjustable pressure reducing valve according to claim 6, characterized in that: The flushing assembly (9) comprises a plurality of soft first water outlet pipes (901) and a plurality of first one-way valve nozzles (902); the plurality of first water outlet pipes (901) are arranged in a divergent shape on the outer periphery of the connecting rod (14); one end of the first water outlet pipe (901) is connected to the diaphragm (802), and the other end extends to the lower part of the filter assembly (6); the plurality of first one-way valve nozzles (902) are respectively connected to one end of the plurality of first water outlet pipes (901) close to the filter assembly (6) in a one-to-one correspondence; and the first one-way valve nozzles (902) are connected to the water storage chamber (801) through the first water outlet pipes (901).

8. The adjustable pressure reducing valve according to claim 6, characterized in that: The cleaning assembly (10) comprises a plurality of hard second water outlet pipes (1001) and a plurality of second one-way valve nozzles (1002); the plurality of second water outlet pipes (1001) are arranged in a divergent shape on the outer periphery of the connecting rod (14); one end of the second water outlet pipe (1001) is connected to the connecting rod (14), and the other end extends to the lower side of the sealing surface of the valve core (11); the plurality of second one-way valve nozzles (1002) are respectively installed at one end of the second water outlet pipe (1001) close to the sealing surface of the valve core (11); and the second one-way valve nozzles (1002) are connected to the water hole (1401) through the second water outlet pipe (1001).

9. The adjustable pressure reducing valve according to claim 1, characterized in that: A stud (18) is provided at the upper end of the connecting rod (14), and a connecting hole (401) is provided at the lower end of the valve stem (4). The inner diameter of the connecting hole (401) is not less than the outer diameter of the stud (18). The stud (18) is inserted into the connecting hole (401), and a nut (17) is provided inside the connecting hole (401). The nut (17) is threadedly connected to the stud (18).

10. The adjustable pressure reducing valve according to claim 1, characterized in that: A first conduit (19) is connected between the water inlet chamber (102) and the valve cover (2), and a needle valve (20) and a filter (21) are sequentially provided on the first conduit (19) from one end close to the valve body (1) to one end close to the valve cover (2). A second conduit (22) is connected between the water outlet chamber (103) and the valve cover (2), and a pilot valve (23) and a ball valve (24) are sequentially provided on the second conduit (22) from one end close to the valve cover (2) to one end close to the valve body (1).

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