Filtering pressure reducing valve

Abstract

The application relates to the technical field of pressure reducing valves, in particular to a filtering pressure reducing valve which comprises a pressure reducing module, a first filtering module and a second filtering module which are fixedly arranged at the inlet side and the outlet side of the pressure reducing module respectively, the pressure reducing module is provided with a diaphragm, a spring and an adjusting rod, the diaphragm is used for sensing the outlet pressure of flowing medium, and the spring is in abutment with the diaphragm; the second filtering module is provided with a second valve body, a second water storage cup which is detachably arranged below the second valve body, a second water outlet pipe, a second filtering piece, a third filtering piece which is sleeved outside the second filtering piece and a liquid blocking ring, the second filtering piece is arranged in communication with the second valve body, and the third filtering piece can be positionally adjusted along the axial direction of the second water storage cup; a liquid guide ring is arranged in the second valve body, and an inlet channel for guiding the flowing medium into the second water storage cup is formed in the liquid guide ring; and the filtering state can be synchronously adjusted according to the pressure reducing operation.

Description

Technical Field

[0001] This invention relates to the field of pressure reducing valve technology, specifically to a filter pressure reducing valve. Background Technology

[0002] Filter pressure reducing valves are commonly used in fluid delivery pipelines to regulate the pressure of flowing media. They employ a filter assembly within the fluid channel to intercept impurities in the medium, thus meeting the pressure and cleanliness requirements of downstream water-using equipment. Existing filter pressure reducing valves typically incorporate a pressure-reducing mechanism and a filter screen inside the valve body. After pressure regulation, the flowing media continuously passes through the filter screen, which intercepts impurities, thereby reducing the amount of impurities entering the downstream pipeline.

[0003] In actual use, the transmission pressure of the flowing medium will change with the working state of the pipeline. When the flowing medium is at a low pressure, the medium transmission flow is relatively small, and the filter screen can continuously filter the flowing medium that passes through. However, when the flowing medium is at a high pressure and a large flow, the amount of medium passing through the filter screen per unit time increases, and impurities carried in the flowing medium will also continuously accumulate on the filter screen, making it easy for more impurities to accumulate on the filter screen during long-term operation.

[0004] In existing pressure-reducing valves, the filter screen typically filters the flowing medium in a fixed filtration state. When the pressure-reducing mechanism adjusts the pressure of the flowing medium, the working state of the filter screen usually does not change synchronously with the pressure reduction. Therefore, under high pressure and high flow rate conditions, impurities in the flowing medium tend to continuously cover the filtration area of ​​the same filter screen, gradually reducing the effective flow area of ​​the filter screen. This increases the flow resistance of the flowing medium as it passes through the filter screen, and in severe cases, may even affect the normal and efficient transmission of the flowing medium. Simultaneously, under low pressure and low flow rate conditions, the fixed filter screen maintains the same filtration state, making it difficult to reasonably switch the filter screen's operating state according to different transmission pressures. Summary of the Invention

[0005] To address the aforementioned problems, a filter pressure reducing valve is provided. By proposing a device that can synchronously adjust the filtration state according to the pressure reduction operation, the technical problem of impurities continuously accumulating and covering the same filter screen during high-pressure and high-flow transmission, causing filter screen blockage and affecting the efficient transmission of the flowing medium is solved.

[0006] To address the problems of existing technologies, this invention provides a filter pressure reducing valve, comprising: a pressure reducing module; a first filter module and a second filter module, respectively fixedly disposed on the inlet side and outlet side of the pressure reducing module, and the first filter module and the second filter module being respectively connected to the pressure reducing module; the pressure reducing module includes a diaphragm, a spring, and an adjusting rod, the diaphragm being used to sense the outlet pressure of the flowing medium, the spring abutting against the diaphragm, and the adjusting rod being correspondingly disposed with the spring for adjusting the preload force of the spring acting on the diaphragm; the first filter module includes a first valve body, a first water storage cup detachably disposed below the first valve body, and a first water outlet pipe and a first filter element disposed within the first valve body; The second filtration module includes a second valve body, a second water storage cup detachably disposed below the second valve body, a second water outlet pipe, a second filter element, a third filter element sleeved on the outside of the second filter element, and a liquid-blocking ring. The second filter element is connected to the second valve body, and the third filter element can be adjusted in position along the axial direction of the second water storage cup. The second valve body is provided with a liquid guiding ring, and the liquid guiding ring has an inlet channel for introducing the flowing medium into the second water storage cup. The bottom of the second filter element is provided with a liquid-blocking ring. The third filter element divides the second water storage cup into an outer flow guiding cavity and an inner flow guiding cavity, and can switch between a first position and a second position.

[0007] Preferably, the first filter element is detachably disposed along the axial direction of the first water outlet pipe, the first water storage cup is threadedly connected to the first valve body, and the first filter element is located between the first water storage cup and the first water outlet pipe, so that the flowing medium entering the first water storage cup is filtered by the first filter element and then enters the first water outlet pipe.

[0008] Preferably, the second filter element is coaxially disposed inside the second water cup, and the third filter element has a cylindrical structure and is coaxially sleeved on the outside of the second filter element. The third filter element can slide along the axial direction of the second filter element to change the relative position between the third filter element and the liquid guiding ring.

[0009] Preferably, the bottom of the second filter element is provided with the liquid-blocking ring, which is located below the third filter element. When the third filter element moves downward to below the inlet channel, the flowing medium output from the inlet channel changes its flow direction under the guidance of the liquid-blocking ring and enters the outer guide cavity, so that the flowing medium passes through the third filter element for filtration before entering the second filter element.

[0010] Preferably, the second filtration module further includes an adjusting column coaxially fixed to the top of the third filter element, a synchronizing rod and an adjusting nut that can synchronously connect the adjusting column and the adjusting rod, and an adjusting screw; the adjusting column passes through the second water cup and extends outward from the second water cup, the adjusting column is connected to the adjusting rod through the synchronizing rod, so that when the adjusting rod rotates to adjust the spring pressure, the adjusting column moves synchronously through the synchronizing rod, thereby driving the third filter element to switch between the first position and the second position; the upper end of the adjusting column is fixedly connected to the front end of the synchronizing rod, and the adjusting nut is disposed at the rear end of the synchronizing rod; the adjusting screw is fixedly disposed at the top of the adjusting rod, and the adjusting nut is threadedly connected to the adjusting screw, so that when the adjusting rod rotates, it drives the adjusting screw to rotate, and the synchronizing rod moves vertically through the threaded engagement between the adjusting screw and the adjusting nut.

[0011] Preferably, the adjusting screw and the adjusting rod are coaxially arranged, the adjusting nut can move along the axial direction of the adjusting screw, and the synchronizing rod moves synchronously with the adjusting nut and drives the adjusting column to rise and fall, so that the axial position of the third filter element changes synchronously with the rotation of the adjusting rod.

[0012] Preferably, when the adjusting rod rotates to put the spring into the corresponding low-pressure adjustment state, the synchronizing rod drives the third filter element to move to the first position, so that the liquid guiding ring cooperates with the third filter element to close the outer guide cavity, and the flowing medium enters the second filter element for filtration through the inner guide cavity; when the adjusting rod rotates to put the spring into the corresponding high-pressure adjustment state, the synchronizing rod drives the third filter element to move to the second position, so that the inlet channel communicates with the outer guide cavity, and the flowing medium is filtered sequentially through the third filter element and the second filter element.

[0013] Preferably, the first filter module and the second filter module are respectively disposed on the inlet side and the outlet side of the pressure reducing module. The first filter module is used to pre-filter the flowing medium before it enters the pressure reducing module, and the second filter module is used to filter the flowing medium after it has been pressure-regulated by the pressure reducing module. The third filter element switches positions synchronously with the rotation of the adjusting rod, so that the second filter module can change the filtration path of the flowing medium entering the second filter element according to the pressure regulating state of the pressure reducing module.

[0014] The advantages of this invention compared to the prior art are: 1. This invention, through the cooperation of adjusting rod, adjusting screw, adjusting nut, synchronizing rod and adjusting column, enables the pressure reducing module to adjust the pressure while simultaneously driving the third filter element to move axially. This allows the pressure reducing adjustment action to be linked with the filter path switching action of the second filter module, so that the filter state can change synchronously with the pressure reducing state without the need for an additional independent drive mechanism.

[0015] 2. This invention, through the cooperation of the third filter element, the liquid guiding ring, the liquid blocking ring and the second filter element, forms different media filtration paths under different pressure transmission conditions. This allows the flowing medium under high pressure and high flow transmission conditions to pass through the third filter element first and then enter the second filter element, avoiding impurities from being concentrated in the same filtration area for a long time, thereby reducing the possibility of clogging of the filter structure affecting the media transmission efficiency. Attached Figure Description

[0016] Figure 1 This is a 3D diagram of a filter pressure reducing valve.

[0017] Figure 2 This is a side view of a filter pressure reducing valve.

[0018] Figure 3 yes Figure 2 Sectional view at point AA.

[0019] Figure 4 yes Figure 3 A magnified view of section B.

[0020] Figure 5 yes Figure 3 A magnified view of a portion of point C.

[0021] Figure 6 yes Figure 3 A magnified view of a portion of point D.

[0022] Figure 7 This is an exploded perspective view of the first filter module in a filter pressure reducing valve.

[0023] Figure 8 This is a top view of the second filter module in a filter pressure reducing valve.

[0024] Figure 9 yes Figure 8 A three-dimensional sectional view of the section at EE.

[0025] Figure 10 This is an exploded 3D view of the second filter module in a filter pressure reducing valve.

[0026] The numbers on the map are: 1. Pressure reducing module; 11. Diaphragm; 12. Spring; 13. Adjusting rod; 2. First filter module; 21. First valve body; 22. First water storage cup; 23. First water outlet pipe; 24. First filter element; 3. Second filter module; 31. Second valve body; 32. Second water storage cup; 33. Second water outlet pipe; 34. Second filter element; 35. Liquid guide ring; 351. Inlet channel; 36. Third filter element; 361. Liquid blocking ring; 362. Adjusting column; 37. Liquid baffle ring; 38. Synchronizing rod; 381. Adjusting nut; 39. Adjusting screw. Detailed Implementation

[0027] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0028] See Figures 1 to 10 As shown: A filter pressure reducing valve includes: a pressure reducing module 1; a first filter module 2 and a second filter module 3, respectively fixedly disposed on the inlet side and outlet side of the pressure reducing module 1, and the first filter module 2 and the second filter module 3 are respectively connected to the pressure reducing module 1; the pressure reducing module 1 is provided with a diaphragm 11, a spring 12 and an adjusting rod 13, the diaphragm 11 is used to sense the outlet pressure of the flowing medium, the spring 12 abuts against the diaphragm 11, and the adjusting rod 13 is correspondingly disposed with the spring 12 and is used to adjust the preload force of the spring 12 acting on the diaphragm 11; the first filter module 2 is provided with a first valve body 21, a first water storage cup 22 detachably disposed below the first valve body 21, a first water outlet pipe 23 disposed inside the first valve body 21 and a first filter element 24; The second filtration module 3 includes a second valve body 31, a second water cup 32 detachably disposed below the second valve body 31, a second water outlet pipe 33, a second filter element 34, a third filter element 36 sleeved on the outside of the second filter element 34, and a liquid-blocking ring 37. The second filter element 34 is connected to the second valve body 31. The third filter element 36 can be adjusted in position along the axial direction of the second water cup 32. The second valve body 31 is provided with a liquid guiding ring 35. The liquid guiding ring 35 has an inlet channel 351 for introducing the flowing medium into the second water cup 32. The bottom of the second filter element 34 is provided with a liquid-blocking ring 361. The third filter element 36 divides the second water cup 32 into an outer guide cavity and an inner guide cavity, and can switch between a first position and a second position.

[0029] When the third filter element 36 is in the first position, the third filter element 36 cooperates with the liquid guiding ring 35 to close the outer guide cavity, allowing the flowing medium to enter the inner guide cavity and be filtered by the second filter element 34; when the third filter element 36 is in the second position, the third filter element 36 moves to below the inlet channel 351 and cooperates with the liquid blocking ring 361 to guide the flowing medium to the outer guide cavity, allowing the flowing medium to be filtered by the third filter element 36 and then enter the second filter element 34.

[0030] The first valve body 21 is provided with an inlet and an outlet. The outlet is connected to a first outlet pipe 23 vertically disposed inside the first valve body 21. The first filter element 24 is detachably disposed on the first outlet pipe 23 to filter the flowing medium entering the first water storage cup 22 through the inlet.

[0031] When this filter pressure reducing valve is in operation, the flowing medium first passes through the first filter module 2 for pre-filtration before entering the pressure reducing module 1. Pressure regulation is achieved through the cooperation of the diaphragm 11, spring 12, and adjusting rod 13. By rotating the adjusting rod 13, the preload of the spring 12 on the diaphragm 11 is changed. The diaphragm 11 senses the outlet pressure and, via the valve stem, drives the valve core to change the valve opening, thereby regulating the outlet pressure. The pressure reducing module is existing technology and will not be described in detail here; the purpose is only to demonstrate the pressure-regulating rod 13. The first filter module 2 and the second filter module 3 are respectively located on the inlet and outlet sides of the pressure reducing module 1, allowing the flowing medium to be filtered through the corresponding filter structures after entering the pressure reducing module 1 and after being pressure-regulated by the pressure reducing module 1.

[0032] The second filtration module 3 internally comprises a second water outlet pipe 33, a second filter element 34, and a third filter element 36 sleeved on the outside of the second filter element 34. The second water outlet pipe 33 is vertically disposed within the second valve body 31. The second filter element 34 is detachably disposed on the second water outlet pipe 33. The third filter element 36 can move along the axial direction of the second water storage cup 32, and its position change alters the flow path of the flowing medium within the second water storage cup 32. When the third filter element 36 is in the first position, it cooperates with the liquid guide ring 35 to close the outer guide cavity. The flowing medium enters the inner guide cavity through the inlet channel 351 and is filtered by the second filter element 34. When the third filter element 36 moves to the second position, it is located below the inlet channel 351. The flowing medium changes its flow direction under the action of the liquid blocking ring 361 and enters the outer guide cavity. It is then filtered by the third filter element 36 before entering the second filter element 34, thus forming different filtration paths.

[0033] Therefore, by changing the axial position of the third filter element 36, the flow path inside the second filter module 3 is adjusted, so that the pressure regulation state of the pressure reducing module 1 can correspond to the filtration path of the second filter module 3. This avoids the flowing medium from continuously passing through the same filtration path under different pressure and flow conditions, and reduces the possibility of blockage of a single filter structure due to long-term use.

[0034] Through the linkage between the pressure reducing module 1 and the second filtration module 3, the third filter element 36 can change the filtration path of the flowing medium, thereby switching the filtration path according to different pressure transmission states, reducing the blockage caused by impurities continuously concentrating in the same filtration area, and improving the filtration and transmission stability of the flowing medium under different pressure states.

[0035] The liquid-blocking ring 37 is coaxially fixed on the second valve body 31 and located between the third filter element 36 and the second filter element 34. When the third filter element 36 is in the first position, the filter holes on the third filter element 36 are misaligned with the filter holes of the liquid-blocking ring 37 and are blocked and closed by the liquid-blocking ring 37. Correspondingly, when the third filter element 36 is in the second position, the filter holes overlap and open. The bottom of the liquid-blocking ring 37 is also radially perforated with multiple through holes for the medium to be conducted toward the inner guide cavity.

[0036] See Figure 7 As shown: the first filter element 24 is detachably arranged along the axial direction of the first water outlet pipe 23, the first water storage cup 22 is threadedly connected to the first valve body 21, and the first filter element 24 is located between the first water storage cup 22 and the first water outlet pipe 23, so that the flowing medium entering the first water storage cup 22 is filtered by the first filter element 24 and then enters the first water outlet pipe 23.

[0037] The first filter module 2 serves as the filtration structure before the flowing medium enters the pressure reducing module 1. Its first filter element 24 is detachably installed along the axial direction of the first outlet pipe 23, allowing it to be installed between the first water storage cup 22 and the first outlet pipe 23. After the flowing medium enters the first water storage cup 22 through the inlet of the first valve body 21, it is first filtered by the first filter element 24. The filtered flowing medium then enters the first outlet pipe 23 and is conducted to the pressure reducing module 1 through the outlet. The first water storage cup 22 is threadedly connected to the first valve body 21. When cleaning or replacing the first filter element 24 is required, the first water storage cup 22 can be removed from the first valve body 21, facilitating the removal and maintenance of the first filter element 24.

[0038] See Figure 9As shown: the second filter element 34 is coaxially disposed inside the second water cup 32, and the third filter element 36 has a cylindrical structure and is coaxially sleeved on the outside of the second filter element 34. The third filter element 36 can slide along the axial direction of the second filter element 34 to change the relative position between the third filter element 36 and the liquid guiding ring 35.

[0039] The second filter element 34 is coaxially disposed inside the second water reservoir 32, and the third filter element 36 is cylindrical and sleeved on the outside of the second filter element 34, so that the third filter element 36 can form an independent outer flow area around the second filter element 34. When the third filter element 36 moves along the axial direction of the second filter element 34, its position relative to the liquid guiding ring 35 changes accordingly, thereby changing the spatial relationship between the liquid guiding ring 35, the third filter element 36, and the second filter element 34, so that the flowing medium can enter different flow guiding areas according to the position of the third filter element 36.

[0040] By fitting the third filter element 36 outside the second filter element 34, the flow path before entering the second filter element 34 can be adjusted when the third filter element 36 moves axially without changing the position of the second filter element 34.

[0041] See Figure 6 and Figure 10 As shown: The bottom of the second filter element 34 is provided with the liquid blocking ring 361, which is located below the third filter element 36. When the third filter element 36 moves downward to below the inlet channel 351, the flowing medium output from the inlet channel 351 changes its flow direction under the guidance of the liquid blocking ring 361 and enters the outer guide cavity, so that the flowing medium passes through the third filter element 36 for filtration before entering the second filter element 34.

[0042] The second filter element 34 has a liquid-blocking ring 361 at its bottom, and the liquid-blocking ring 361 is located below the third filter element 36. When the third filter element 36 moves downward to below the inlet channel 351, the flowing medium entering the second water cup 32 through the inlet channel 351 is guided by the liquid-blocking ring 361, causing its flow direction to change and enter the outer guide cavity where the third filter element 36 is located. The flowing medium is filtered by the third filter element 36 before entering the second filter element 34, and then enters the second filter element 34 for further filtration, thus enabling the third filter element 36 to participate in the filtration process under high-pressure transmission conditions.

[0043] See Figure 3 , Figure 5 , Figure 9 and Figure 10As shown: The second filter module 3 further includes an adjusting column 362 coaxially fixed to the top of the third filter element 36, a synchronizing rod 38 and an adjusting nut 381 capable of synchronously connecting the adjusting column 362 and the adjusting rod 13, and an adjusting screw 39; the adjusting column 362 passes through the second water cup 32 and extends outward from the second water cup 32, and the adjusting column 362 is connected to the adjusting rod 13 through the synchronizing rod 38, so that when the adjusting rod 13 rotates to adjust the pressure of the spring 12, the adjusting column 362 moves synchronously through the synchronizing rod 38, thereby... The third filter element 36 is driven to switch between the first position and the second position; the upper end of the adjusting column 362 is fixedly connected to the front end of the synchronizing rod 38, and the adjusting nut 381 is disposed at the rear end of the synchronizing rod 38; the adjusting screw 39 is fixedly disposed at the top of the adjusting rod 13, and the adjusting nut 381 is threadedly connected to the adjusting screw 39 so that when the adjusting rod 13 rotates, it drives the adjusting screw 39 to rotate, and the synchronizing rod 38 is driven to move in the vertical direction through the threaded engagement between the adjusting screw 39 and the adjusting nut 381.

[0044] An adjusting column 362 is fixedly installed on the top of the third filter element 36. The adjusting column 362 passes through the second water cup 32 and extends outward. The adjusting column 362 is fixedly connected to one end of the synchronizing rod 38. An adjusting nut 381 is installed on the other end of the synchronizing rod 38. An adjusting screw 39 is fixedly installed on the top of the adjusting rod 13. The adjusting nut 381 and the adjusting screw 39 form a threaded engagement. When adjusting the pressure reduction module 1, rotating the adjusting rod 13 can synchronously drive the adjusting screw 39 to rotate. During the rotation of the adjusting screw 39, through the threaded engagement with the adjusting nut 381, the rotational motion of the adjusting screw 39 is converted into the vertical movement of the adjusting nut 381, which in turn drives the synchronizing rod 38 and the adjusting column 362 to rise and fall synchronously, so that the third filter element 36, which is fixedly connected to the adjusting column 362, can be adjusted axially synchronously. Since the adjusting column 362 is fixedly connected to one end of the synchronizing rod 38, when the rotational motion of the adjusting screw 39 is converted into the vertical movement of the adjusting nut 381, the adjusting column 362 will be driven to move only in the vertical direction under the synchronous limiting guidance of the synchronizing rod 38.

[0045] Therefore, the adjusting rod 13 in the pressure reduction module 1 not only changes the force exerted by the spring 12 on the diaphragm 11, but also transmits the rotational motion of the adjusting rod 13 to the third filter element 36 through the adjusting screw 39, adjusting nut 381, synchronizing rod 38, and adjusting column 362, so that the pressure reduction adjustment action and the filtration path switching action are synchronized. See Figure 3 and Figure 5As shown: The adjusting screw 39 is coaxially arranged with the adjusting rod 13. The adjusting nut 381 can move along the axial direction of the adjusting screw 39. The synchronizing rod 38 moves synchronously with the adjusting nut 381 and drives the adjusting column 362 to rise and fall, so that the axial position of the third filter element 36 changes synchronously with the rotation of the adjusting rod 13.

[0046] The adjusting screw 39 is coaxially arranged with the adjusting rod 13, so that the adjusting rod 13 can drive the adjusting screw 39 to rotate synchronously during rotation. Since the adjusting nut 381 and the adjusting screw 39 are connected by a thread, the rotation of the adjusting screw 39 can drive the adjusting nut 381 to move axially along the adjusting screw 39. The adjusting nut 381 further drives the synchronizing rod 38 to move vertically, and through the synchronizing rod 38, it drives the adjusting column 362 to rise and fall, thereby causing the third filter element 36 to move synchronously along the axial direction of the second filter element 34.

[0047] Through the above transmission method, the rotational motion of the adjusting rod 13 is converted into the linear motion of the third filter element 36, so that the third filter element 36 can change its position accordingly with the rotation direction and adjustment position of the adjusting rod 13.

[0048] See Figure 9 and Figure 10 As shown: When the adjusting rod 13 rotates and the spring 12 is in the corresponding low-pressure adjustment state, the synchronizing rod 38 drives the third filter element 36 to move to the first position, so that the liquid guiding ring 35 cooperates with the third filter element 36 to close the outer guide cavity, and the flowing medium enters the second filter element 34 for filtration through the inner guide cavity; when the adjusting rod 13 rotates and the spring 12 is in the corresponding high-pressure adjustment state, the synchronizing rod 38 drives the third filter element 36 to move to the second position, so that the inlet channel 351 is connected to the outer guide cavity, and the flowing medium is filtered sequentially through the third filter element 36 and the second filter element 34.

[0049] Under low-pressure transmission conditions, the adjustment position of the corresponding adjustment rod 13 causes the synchronization rod 38 to drive the third filter element 36 to the first position. At this time, the third filter element 36 and the liquid guiding ring 35 cooperate with each other to keep the outer guide cavity closed. The flowing medium enters the second water storage cup 32 through the inlet channel 351 and mainly enters the inner guide cavity. After being filtered by the second filter element 34, it is conducted downstream.

[0050] When the adjusting rod 13 is rotated to the corresponding high-pressure adjusting state, the adjusting screw 39 drives the third filter element 36 downward to the second position via the adjusting nut 381 and the synchronizing rod 38, so that the third filter element 36 moves below the inlet channel 351. At this time, the inlet channel 351 is connected to the outer guide cavity, and the flowing medium enters the outer guide cavity under the guidance of the liquid blocking ring 361, and is filtered by the third filter element 36 and the second filter element 34 in sequence.

[0051] Therefore, under different transmission pressure conditions, the third filter element 36 can change its position synchronously with the pressure reducing adjustment rod 13, so that the second filter module 3 can form different media filtration paths.

[0052] See Figure 1 and Figure 10 As shown: the first filter module 2 and the second filter module 3 are respectively disposed on the inlet side and outlet side of the pressure reducing module 1. The first filter module 2 is used to pre-filter the flowing medium before it enters the pressure reducing module 1, and the second filter module 3 is used to filter the flowing medium after it has been pressure-regulated by the pressure reducing module 1. The third filter element 36 switches positions synchronously with the rotation of the adjusting rod 13, so that the second filter module 3 can change the filtration path of the flowing medium entering the second filter element 34 according to the pressure regulating state of the pressure reducing module 1.

[0053] The first filter module 2 is located on the inlet side of the pressure reducing module 1. The flowing medium is pre-filtered by the first filter module 2 before entering the pressure reducing module 1 to reduce impurities in the flowing medium from entering the pressure reducing module 1. The second filter module 3 is located on the outlet side of the pressure reducing module 1 and is used to filter the flowing medium again after the pressure is regulated by the pressure reducing module 1.

[0054] Simultaneously, the third filter element 36 in the second filter module 3 is linked to the adjusting rod 13 in the pressure reducing module 1 via a synchronizing rod 38. When the adjusting rod 13 adjusts the pressure, the third filter element 36 switches positions synchronously with the movement of the adjusting rod 13, causing the filtration path inside the second filter module 3 to change according to the pressure adjustment state of the pressure reducing module 1. Therefore, when the pressure reducing module 1 adjusts to different pressure states, the second filter module 3 can synchronously change the entry path of the flowing medium, making the filtration process linked with the pressure reducing process.

[0055] This invention can synchronously adjust the filtration state according to the decompression operation.

[0056] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A filter pressure reducing valve, characterized in that, include: Pressure reduction module; The first filter module and the second filter module are fixedly disposed on the inlet side and the outlet side of the pressure reducing module, respectively, and the first filter module and the second filter module are respectively connected to the pressure reducing module. The pressure reduction module includes a diaphragm, a spring, and an adjusting rod. The diaphragm is used to sense the outlet pressure of the flowing medium. The spring abuts against the diaphragm. The adjusting rod is correspondingly arranged with the spring and is used to adjust the preload force of the spring acting on the diaphragm. The first filtration module includes a first valve body, a first water storage cup detachably disposed below the first valve body, a first water outlet pipe disposed within the first valve body, and a first filter element. The second filtration module includes a second valve body, a second water cup detachably disposed below the second valve body, a second water outlet pipe, a second filter element, a third filter element sleeved on the outside of the second filter element, and a liquid-blocking ring. The second filter element is connected to the second valve body, and the third filter element can be adjusted in position along the axial direction of the second water cup. The second valve body is provided with a liquid guiding ring, and the liquid guiding ring is provided with an inlet channel for introducing the flowing medium into the second water storage cup. The bottom of the second filter element is provided with a liquid blocking ring. The third filter element divides the second water cup into an outer flow chamber and an inner flow chamber, and can switch between a first position and a second position.

2. The filter pressure reducing valve according to claim 1, characterized in that, The first filter element is detachably disposed along the axial direction of the first water outlet pipe. The first water storage cup is threadedly connected to the first valve body. The first filter element is located between the first water storage cup and the first water outlet pipe, so that the flowing medium entering the first water storage cup is filtered by the first filter element and then enters the first water outlet pipe.

3. A filter pressure reducing valve according to claim 1, characterized in that, The second filter element is coaxially disposed inside the second water storage cup, and the third filter element has a cylindrical structure and is coaxially sleeved on the outside of the second filter element. The third filter element can slide along the axial direction of the second filter element to change the relative position between the third filter element and the liquid guiding ring.

4. A filter pressure reducing valve according to claim 3, characterized in that, The bottom of the second filter element is provided with the liquid-blocking ring, which is located below the third filter element. When the third filter element moves downward to below the inlet channel, the flowing medium output from the inlet channel changes its flow direction under the guidance of the liquid-blocking ring and enters the outer guide cavity, so that the flowing medium passes through the third filter element for filtration before entering the second filter element.

5. A filter pressure reducing valve according to claim 1, characterized in that, The second filter module also includes an adjustment column coaxially fixed to the top of the third filter element, a synchronizing rod and an adjustment nut that can synchronously connect the adjustment column and the adjustment rod, and an adjustment screw. The adjusting column passes through the second water cup and extends outward from the second water cup. The adjusting column is connected to the adjusting rod through a synchronizing rod, so that when the adjusting rod rotates to adjust the spring pressure, the adjusting column moves synchronously through the synchronizing rod, thereby driving the third filter element to switch between the first position and the second position. The upper end of the adjusting column is fixedly connected to the front end of the synchronizing rod, and the adjusting nut is located at the rear end of the synchronizing rod; The adjusting screw is fixedly mounted on the top of the adjusting rod, and the adjusting nut is threadedly connected to the adjusting screw so that when the adjusting rod rotates, it drives the adjusting screw to rotate, and the threaded engagement between the adjusting screw and the adjusting nut drives the synchronizing rod to move vertically.

6. A filter pressure reducing valve according to claim 5, characterized in that, The adjusting screw and the adjusting rod are coaxially arranged. The adjusting nut can move along the axial direction of the adjusting screw. The synchronizing rod moves synchronously with the adjusting nut and drives the adjusting column to rise and fall, so that the axial position of the third filter element changes synchronously with the rotation of the adjusting rod.

7. A filter pressure reducing valve according to claim 6, characterized in that, When the adjusting rod rotates to put the spring into the corresponding low-pressure adjustment state, the synchronizing rod drives the third filter element to move to the first position, so that the liquid guiding ring cooperates with the third filter element to close the outer flow guiding cavity, and the flowing medium enters the second filter element for filtration through the inner flow guiding cavity; When the adjusting rod rotates to put the spring into the corresponding high-pressure adjustment state, the synchronizing rod drives the third filter element to move to the second position, so that the inlet channel is connected to the external guide cavity, and the flowing medium is filtered by the third filter element and the second filter element in sequence.

8. A filter pressure reducing valve according to claim 1, characterized in that, The first filter module and the second filter module are respectively disposed on the inlet side and the outlet side of the pressure reducing module. The first filter module is used to pre-filter the flowing medium before it enters the pressure reducing module, and the second filter module is used to filter the flowing medium after it has been pressure-regulated by the pressure reducing module. The third filter element switches positions synchronously with the rotation of the adjusting rod, so that the second filter module can change the filtration path of the flowing medium into the second filter element according to the pressure regulation state of the pressure reducing module.

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