A pressure reducing valve assembly and minimum flow regulating valve

Abstract

The utility model discloses a pressure reducing valve assembly and minimum flow regulating valve, pressure reducing valve assembly includes the buffer sleeve and the valve core of vertical setting, and the valve core includes valve core stem and a plurality of buffer cylinders, and the lower extreme of buffer sleeve is the liquid inlet, and its upper extreme is the liquid outlet, and the buffer sleeve is in the coaxial convex and is provided with a plurality of vertical interval distribution's flow -equalizing ring, and a plurality of buffer cylinders are coaxially convex on the valve core stem, and are vertically interval distribution on the valve core stem, and the inner diameter of flow -equalizing ring is consistent with the diameter of buffer cylinder, and the valve core stem is coaxial and passes through in the buffer sleeve, and a plurality of flow -equalizing rings and a plurality of buffer cylinders are one to one corresponding, and every buffer cylinder is located in the corresponding flow -equalizing ring, and the lower extreme of every buffer cylinder is convex arc surface body shape, and the valve core stem drives a plurality of buffer cylinders to move up and down relative to the buffer sleeve under the action of external force to open or block corresponding flow -equalizing ring synchronously. Like this can be through buffer cylinder and flow -equalizing ring cooperation to carry out pressure reduction to liquid fluid and adjust its flow.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, and in particular relates to a pressure reducing valve assembly and a minimum flow regulating valve. Background Technology

[0002] The main structural differences in existing minimum flow control valves lie in the valve core and buffer sleeve. Their principle is still based on multi-stage pressure reduction and buffering to allow liquid fluid to flow out at lower pressure and flow rate. However, the valve core is prone to vibration or jamming during operation, affecting its coaxiality. This leads to poor sealing performance between the valve core and buffer sleeve, or jamming between them. Furthermore, current minimum flow control valves adjust flow linearly (as disclosed in documents CN209340594U "Minimum Flow Control Valve" and CN204226668U "Control Valve"), meaning the flow rate increases or decreases linearly. This results in insufficient accuracy at low flow rates and an inability to quickly increase the flow rate at high flow rates. Utility Model Content

[0003] To solve the above-mentioned technical problems, one of the objectives of this utility model is to provide a pressure reducing valve assembly that has good pressure reducing effect, is not prone to jamming, can perform high-precision adjustment at low flow rates, and can quickly adjust the flow rate at high flow rates.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: A pressure reducing valve assembly includes a vertically arranged buffer sleeve and a valve core. The lower end of the buffer sleeve is the liquid inlet end, and the upper end is the liquid outlet end. Multiple vertically spaced flow equalizing rings are coaxially protruded within the buffer sleeve, dividing the buffer sleeve into multiple expansion chambers along the axial direction. A flow equalizing ring is located between any two adjacent expansion chambers. The valve core includes a valve core rod and multiple buffer columns, with the multiple buffer columns having coaxially protruding... The flow equalization rings are arranged vertically and spaced on the valve core rod. The inner diameter of the flow equalization rings is the same as the diameter of the buffer column. The valve core rod coaxially passes through the buffer sleeve, and the multiple flow equalization rings correspond one-to-one with the multiple buffer columns. Each buffer column is located in the corresponding flow equalization ring. The lower end of each buffer column is a convex arc surface. Under the action of external force, the valve core rod drives the multiple buffer columns to move up and down relative to the buffer sleeve, so as to simultaneously open or close the multiple flow equalization rings.

[0005] The beneficial effects of the above technical solution are as follows: When the valve core moves up and down relative to the buffer sleeve, if the upper end of each buffer column is located within the corresponding flow equalization ring, all flow equalization rings are blocked. However, if the lower end of each buffer column is located within the corresponding flow equalization ring, a circumferential gap exists between the buffer column and the corresponding flow equalization ring to connect two adjacent expansion chambers for the passage of liquid fluid. Furthermore, the size of the circumferential gap can be adjusted by regulating the vertical position of the valve core relative to the buffer sleeve. [Since the lower end of the buffer column is a convex arc-shaped surface, this ensures that when the flow equalization ring is just opened, its adjustment...] The flow rate adjustment is relatively high (i.e., the flow rate adjustment is slower but more accurate at low flow rates), but as the buffer column continues to move upward, the adjustment accuracy decreases (i.e., the flow rate can be adjusted quickly at high flow rates, but the accuracy is lower). In addition, setting the lower end of the buffer column to a convex arc shape can also prevent the buffer column from getting stuck in the corresponding flow equalization ring. As the liquid fluid flows from bottom to top in the buffer sleeve, the liquid fluid is sprayed and depressurized once at each circumferential gap. After multiple depressurizations, the flow rate of the liquid fluid is stable and the flow pressure difference is significantly reduced.

[0006] In the above technical solution, at least three buffer ribs are evenly spaced along the circumference at the lower end of each buffer column on the valve core rod. The buffer ribs are distributed radially along the valve core rod, and the side of each buffer rib facing away from the valve core rod is flush with the edge of the buffer column.

[0007] The beneficial effects of the above technical solution are as follows: when the liquid fluid flows between two adjacent buffer columns, the buffer ribs can reduce the pressure of the liquid fluid in the circumference. At the same time, the multiple buffer ribs make the entire valve core have a better axial guiding effect. Firstly, the valve core is not easy to bend and deform. Secondly, the buffer ribs can cooperate with the flow equalization ring to make the valve core always maintain a high degree of coaxiality.

[0008] In the above technical solution, the multiple buffer ribs of two adjacent rings are staggered.

[0009] The beneficial effect of the above technical solution is that it allows the liquid fluid to flow upward in a maze-like manner, which helps to further improve the decompression effect.

[0010] The second objective of this utility model is to provide a minimum flow regulating valve with a simple structure, good anti-jamming performance, high-precision adjustment at low flow rates, and quick increase / decrease at high flow rates.

[0011] To achieve the above objectives, another technical solution of this utility model is as follows: A minimum flow regulating valve includes a valve housing, a valve stem, and a pressure reducing valve assembly as described above. The valve housing has a valve cavity inside. A valve stem channel is vertically arranged at the upper end of the valve housing, coaxially distributed and communicating with the valve cavity. The valve housing is provided with an inlet channel coaxially communicating with the lower end of the valve cavity and a drain channel communicating through the side wall of the valve cavity. A buffer sleeve is coaxially embedded in the valve cavity, and a buffer chamber is provided between the buffer sleeve and the side wall of the valve cavity. An overflow hole is provided on the side wall of the uppermost expansion cavity. The drain channel and the overflow hole are both communicating with the buffer chamber. The inlet channel is aligned with the lower end of the buffer sleeve. The valve stem slides through the valve stem channel in a sealed manner, and its lower end is coaxially connected to the upper end of the valve core rod. Under the action of external force, the valve stem drives the valve core to move up and down in the buffer sleeve.

[0012] The beneficial effects of the above technical solution are as follows: the valve stem of the minimum flow regulating valve can drive the valve core to move up and down under the action of external force. When the pressure reducing valve assembly is open, the pressurized liquid can enter the buffer sleeve through the inlet channel, and after multiple buffering and pressure reduction, it flows out through the overflow hole into the buffer chamber, and finally is discharged through the drain channel. Since the circumferential gap between the multiple buffer columns and the corresponding flow equalization ring can be adjusted synchronously, the minimum flow regulating valve can adjust the flow rate as needed while reducing pressure.

[0013] The valve core described in the above technical solution further includes an opening and closing head coaxially disposed at the lower end of the valve core rod and located directly above the connection between the liquid inlet channel and the valve cavity. The opening and closing head is used to block the liquid inlet channel when the valve core moves down to the limit position, and when the liquid inlet channel is blocked, each of the buffer columns blocks the corresponding flow equalization ring.

[0014] The beneficial effect of the above technical solution is that the inlet channel can be blocked by the opening and closing head, and multiple flow equalization rings are also in a blocked state. At this time, the entire minimum flow regulating valve is in a closed state. Even if the multiple flow equalization rings are not blocked tightly, the opening and closing head can still play a role in intercepting the flow. When multiple flow equalization rings are all in an open state, the opening and closing head will definitely open the inlet channel.

[0015] The above technical solution provides multiple overflow holes, and the multiple overflow holes are distributed circumferentially at intervals at the upper end of the buffer sleeve.

[0016] The beneficial effect of the above technical solution is that it ensures that the overflow flow rate at the upper end of the buffer sleeve meets the requirements, and avoids pressure buildup and jet formation due to poor drainage at the upper end of the buffer sleeve.

[0017] The valve core in the above technical solution also includes a piston rod coaxially protruding on the valve core rod. The plurality of buffer columns are located below the piston rod. The piston rod is slidably and sealingly disposed in the uppermost expansion cavity, which is used to block the upper end of the buffer sleeve. When the valve core blocks the plurality of flow equalization rings, the piston rod blocks the overflow hole. Or when the valve core opens the plurality of flow equalization rings, the piston rod opens the overflow hole.

[0018] The beneficial effects of the above technical solution are as follows: the piston rod always blocks the upper end of the buffer sleeve during the up and down movement of the valve core, while the overflow hole is located at the lower end of the piston rod's sliding trajectory. This ensures that the liquid flowing through the buffer sleeve can only flow out through the overflow hole. Furthermore, even if leakage occurs when multiple flow equalization rings are in a blocked state, the piston rod will block the overflow hole, acting as the final interception barrier.

[0019] The liquid inlet channel described in the above technical solution has a liquid inlet chamber in the middle, and a filter cover is provided inside the liquid inlet chamber.

[0020] The beneficial effect of the above technical solution is that the liquid flowing into the buffer sleeve can be filtered to prevent slag from entering the buffer sleeve and causing the valve core to jam.

[0021] The valve housing described in the above technical solution includes a valve body, a valve cover ring, and a packing chamber. The valve cavity, inlet channel, and outlet channel are all located on the valve body. The upper end of the valve body is coaxially provided with an insert hole communicating with the outside. The valve stem channel coaxially passes through the packing chamber. The lower end of the packing chamber is turned outward to form an abutment ring. The lower end of the packing chamber coaxially extends into the insert hole and abuts against the buffer sleeve. The valve cover ring is fitted outside the packing chamber and connected to the upper end of the valve body to press the packing chamber tightly onto the valve body.

[0022] The advantages of the above technical solution are that it makes the structure of the entire valve body simple, easy to assemble, and provides good sealing performance.

[0023] The valve body described in the above technical solution also includes multiple tension bolts. The valve cover ring is provided with multiple vertical through-holes at intervals along the circumferential direction. The upper end of the valve body is provided with multiple threaded holes at intervals along the circumferential direction. The multiple through-holes, multiple threaded holes and multiple tension bolts correspond one-to-one. Each tension bolt passes through the corresponding through-hole and is threadedly connected to the corresponding threaded hole to install the valve cover ring on the upper end of the valve body.

[0024] The beneficial effects of the above technical solution are: it makes the overall structure of the valve body stronger, and the pressure distribution of the packing chamber against the buffer sleeve is more even, which is conducive to improving the sealing effect. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of the pressure reducing valve assembly described in Embodiment 1 of this utility model when each uniform ring is in a blocked state; Figure 2 This is a cross-sectional view of the pressure reducing valve assembly described in Embodiment 1 of this utility model when each uniform ring is in the open position; Figure 3 This is a schematic diagram of the buffer column described in Embodiment 1 of this utility model; Figure 4 This is a coordinate diagram showing the opening degree of the pressure reducing valve assembly and the axial travel of the valve core in Embodiment 1 of this utility model; Figure 5 This is a schematic diagram of the valve core having a buffer rib plate as described in Embodiment 1 of this utility model; Figure 6 This is a schematic diagram showing the arrangement of the buffer ribs in the buffer ring groove in Embodiment 1 of this utility model; Figure 7 This is a schematic diagram showing the staggered distribution of two adjacent rings of buffer ribs in Embodiment 1 of this utility model; Figure 8 This is a schematic diagram showing the liquid fluid flowing through the outside of the valve core in Embodiment 1 of this utility model. Figure 9 This is a cross-sectional view of the minimum flow regulating valve described in Embodiment 2 of this utility model; Figure 10 This corresponds to the minimum flow regulating valve described in Embodiment 2 of this utility model. Figure 9 Sectional view at point AA; Figure 11 This is an elevation view of the valve core described in Embodiment 2 of this utility model; Figure 12 This is a schematic diagram of the pressure reducing valve assembly in embodiment 2 of this utility model being in a blocked state; Figure 13 This is a schematic diagram showing the pressure reducing valve assembly in the open position as described in Embodiment 2 of this utility model; Figure 14 This is a schematic diagram showing the liquid fluid flowing through the outside of the valve core in Embodiment 2 of this utility model.

[0026] In the diagram: 1. Pressure reducing valve assembly; 11. Buffer sleeve; 111. Flow equalization ring; 112. Expanding diameter chamber; 113. Overflow hole; 114. Reducing diameter ring; 12. Valve core; 121. Valve core rod; 122. Buffer column; 1221. Upper section; 1222. Lower section; 123. Buffer rib; 124. Opening / closing head; 125. Piston column; 126. Buffer ring groove; 1261. Buffer groove; 2. Valve shell; 21. Valve body; 211. Valve cavity; 212. Inlet channel; 2121. Inlet cavity; 2122. Filter cover; 213. Drain channel; 214. Mounting hole; 215. Threaded hole; 22. Valve cover ring; 221. Connecting hole; 23. Packing chamber; 231. Valve stem channel; 232. Abutment ring; 24. Tightening bolt; 3. Valve stem. Detailed Implementation

[0027] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0029] It is understood that spatial relation terms such as “below,” “under,” “below,” “below,” “above,” “above,” etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as “below,” “below,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0030] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. In the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have the transmission of electrical signals or data between them.

[0031] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0032] Example 1 like Figure 1 and Figure 2As shown, this embodiment provides a pressure reducing valve assembly, including a vertically arranged buffer sleeve 11 and a valve core 12. The lower end of the buffer sleeve 11 is the liquid inlet end, and the upper end is the liquid outlet end. Multiple vertically spaced flow equalization rings 111 are coaxially protruding within the buffer sleeve 11, dividing the buffer sleeve 11 axially into multiple expansion chambers 112, with one flow equalization ring 111 between any two adjacent expansion chambers 112. The valve core 12 includes a valve core rod 121 and multiple buffer pillars 122, with the multiple buffer pillars 122 coaxially protruding from the valve core rod 121. The valve core rod 121 is vertically spaced on the valve core rod 121. The inner diameter of the flow equalization ring 111 is the same as the diameter of the buffer column 122. The valve core rod 121 coaxially passes through the buffer sleeve 11, and the multiple flow equalization rings 111 correspond one-to-one with the multiple buffer columns 122. Each buffer column 122 is located in the corresponding flow equalization ring 111. The lower end of each buffer column 122 is a convex arc surface. Under the action of external force, the valve core rod 121 drives the multiple buffer columns 122 to move up and down relative to the buffer sleeve 11, so as to open or block the multiple flow equalization rings 111 simultaneously. This allows the valve core 12 to move up and down relative to the buffer sleeve 11. When the upper end of each buffer column 122 is located within the corresponding flow equalization ring 111, all flow equalization rings 111 are blocked. When the lower end of each buffer column 122 is located within the corresponding flow equalization ring 111, a circumferential gap exists between the buffer column 122 and the corresponding flow equalization ring 111 to connect two adjacent expansion chambers for the passage of liquid fluid. The size of the circumferential gap can be adjusted by adjusting the up and down position of the valve core 12 relative to the buffer sleeve 11. [Since the lower end of the buffer column 122 is a convex arc surface, this ensures that when the flow equalization ring 111 is just opened...] Its adjustment accuracy is relatively high (i.e., the flow rate adjustment is slower at low flow rates, but the accuracy is high). As the buffer column 122 continues to move upward, the adjustment accuracy decreases accordingly (i.e., the flow rate can be quickly adjusted at high flow rates, but the accuracy is low). In addition, the lower end of the buffer column 122 is set as a convex arc surface shape, which can also prevent the buffer column 122 from getting stuck in the corresponding flow equalization ring 111. As the liquid fluid flows from bottom to top in the buffer sleeve 11, the liquid fluid is sprayed and depressurized once at each circumferential gap. After multiple depressurizations, the flow rate of the liquid fluid is stable and the flow pressure difference is significantly reduced.

[0033] In this embodiment, the n flow equalization rings 111 correspond to n+1 diameter expansion cavities 112, where n is a positive integer, preferably 3-10.

[0034] like Figure 3As shown, the buffer column 122 in this embodiment can be divided into an upper section 1221 and a lower section 1222 (the upper section 1221 and the lower section 1222 are coaxially distributed and integrally formed). The upper section 1221 is cylindrical, while the lower section 1222 is convex arc-shaped. The thick end of the lower section 1222 faces upward, and the diameter of its thick end is the same as the diameter of the upper section 1221. It is preferable that the thickness of the upper section 1221 is the same as the thickness of the corresponding flow equalization ring 111 (specifically, the thickness of the upper section 1221 should be 1 / 10 to 1 / 5 of the axial thickness of the lower section 1222).

[0035] Specifically, the lower segment 1222 can be regarded as a parabola of revolution (i.e., a three-dimensional structure formed by rotating a parabola and the surfaces within its domain along its central axis). Of course, the lower segment 1222 can also be hemispherical.

[0036] Preferred, such as Figure 1 As shown, it is preferable that the thickness of the flow equalization ring 111 is the same as the thickness of the upper section 1221. More preferably, when the buffer sleeve 11 is blocked, each upper section 1221 is located inside the corresponding flow equalization ring 111 (and the upper end face of each upper section 1221 is flush with the upper end face of the corresponding flow equalization ring 111).

[0037] Preferably, the spacing between two adjacent buffer columns 122 is consistent, and the spacing between two adjacent flow equalization rings 111 is also consistent. As the valve core 12 moves upward relative to the buffer sleeve 11, the circumferential gap between each flow equalization ring 111 and the corresponding buffer column 122 gradually increases until the buffer column 122 is completely above the corresponding flow equalization ring 111. At this point, the circumferential gap between the flow equalization ring 111 and the valve core rod 121 remains unchanged. If the valve core 12 continues to move upward, each flow equalization ring 111 will approach the buffer column 122 below it, which will affect the flow rate of the liquid flowing through the flow equalization ring 111. Therefore, in this embodiment, the spacing between two adjacent buffer columns 122 must ensure that when the lower end of each buffer column 122 is flush with the upper end of the corresponding flow equalization ring 111, its corresponding opening is at its maximum (the spacing between two adjacent buffer columns can be appropriately increased).

[0038] like Figure 1 and Figure 2As shown, in this embodiment, the extreme position of the valve core 12 moving upward is when the lower end of the buffer column 122 is flush with the upper end of the corresponding flow equalization ring 111 (at this time, each flow equalization ring 111 is at its maximum opening). The extreme position of the valve core 12 moving downward is when the upper end of the buffer column 122 is flush with the upper end of the corresponding flow equalization ring 111 (at this time, each flow equalization ring 111 is in a blocked state). In this embodiment, when the valve core 12 slides upward between the above two extreme positions, the relationship between the opening of the flow equalization ring 111 and the axial stroke of the valve core 12 can be shown as shown in Figure 4.

[0039] by Figure 4 Taking the coordinate diagram as an example, the X-axis represents the axial movement of the valve core, the Y-axis represents the opening of the pressure reducing valve assembly, and O represents the origin, which is also the limit position of the valve core in downward movement (at this time, the upper end face of the flow equalizing ring is flush with the upper end face of the corresponding buffer column). The coordinate (x0, 0) indicates that the valve core has moved to the interface between the upper and lower sections of the buffer column and is flush with the upper end face of the corresponding flow equalizing ring. The coordinate (x1, y1) indicates that the valve core has moved to the lower end of the buffer column and is flush with the upper end face of the corresponding flow equalizing ring (at this time, the maximum opening of the corresponding flow equalizing ring is also the limit position of the valve core in upward movement).

[0040] like Figures 5-7 As shown, in this embodiment, at least three buffer ribs 123 are evenly spaced circumferentially at the lower end of each buffer column 122 on the valve core rod 121. The buffer ribs 123 are radially distributed along the valve core rod 121, and the side of each buffer rib 123 facing away from the valve core rod 121 is flush with the edge of the buffer column 122. This allows the buffer ribs 123 to circumferentially reduce the pressure on the liquid fluid when it flows between two adjacent buffer columns 122. At the same time, the multiple buffer ribs 123 provide better axial guidance for the entire valve core 12. Firstly, the valve core 12 is less prone to bending and deformation, and secondly, the buffer ribs 123 can cooperate with the flow equalization ring 111 to ensure that the valve core 12 always maintains a high degree of coaxiality.

[0041] like Figure 7 As shown, in this embodiment, the multiple buffer ribs 123 in adjacent rings are staggered. This allows the liquid fluid to flow upwards in a maze-like manner, which helps to further improve the decompression effect.

[0042] In this embodiment, three or four buffer ribs 123 of the same ring can be provided.

[0043] in, Figure 7 The solid lines correspond to the same ring of buffer ribs 123, and the dashed lines also correspond to the same ring of buffer ribs 123. However, the solid lines and dashed lines represent two adjacent rings of buffer ribs 123, respectively.

[0044] like Figures 5-7 As shown, in this embodiment, the inner side of the buffer rib plate 123 extends to connect with the valve core rod 121, the lower end of the buffer rib plate 123 at the lowest end extends to be flush with the lower end of the valve core rod 121, and its upper end extends to connect with the buffer column 122 at the lowest end. The upper and lower ends of the remaining buffer rib plates 123 extend to connect with the corresponding two buffer columns 122.

[0045] In this embodiment, the valve core rod 121, the buffer column 122, and the buffer rib plate 123 are integrally formed structures.

[0046] In this embodiment, 3-6 buffer columns 122 can be set, with 4 or 5 being preferred.

[0047] like Figure 8 As shown, in this embodiment, a buffer ring groove 126 can be formed between any two adjacent buffer columns 122, and a buffer groove 1261 can be formed between two adjacent buffer ribs 123 within each buffer ring groove 126. Although the multiple buffer ribs 123 in the lowermost ring cannot form a buffer groove 1261, they can play a similar role to the buffer groove 1261. Except for the uppermost buffer groove 1261, the liquid fluid in the remaining buffer grooves 1261 will be divided into two buffer grooves 1261 during the upward flow process (similar to walking through a maze), thereby further improving the pressure reduction effect of the liquid fluid.

[0048] In this embodiment, the buffer ring groove is a weak point in the valve core structure, but the structure of the buffer ring groove is strengthened by adding buffer ribs.

[0049] Example 2 like Figures 9-13As shown, this embodiment provides a minimum flow regulating valve, including a valve housing 2, a valve stem 3, and a pressure reducing valve assembly 1 as described in Embodiment 1. The valve housing 2 has a valve cavity 211 inside. A valve stem channel 231, coaxially distributed and communicating with the valve cavity 211, is vertically arranged at the upper end of the valve housing 2. The valve housing 2 is provided with an inlet channel 212 coaxially communicating with the lower end of the valve cavity 211 and a drain channel 213 communicating through the side wall of the valve cavity 211. The buffer sleeve 11 is coaxially embedded in the valve cavity 211, and the buffer... A buffer chamber is provided between the sleeve 11 and the side wall of the valve cavity 211. An overflow hole 113 is provided on the side wall of the uppermost expanded diameter cavity 112. The drain channel 213 and the overflow hole 113 are both connected to the buffer chamber. The inlet channel 212 is aligned with the lower end of the buffer sleeve 11. The valve stem 3 passes through the valve stem channel 231 in a sealed sliding manner, and its lower end is coaxially connected to the upper end of the valve core rod 121. Under the action of external force, the valve stem 3 drives the valve core 12 to move up and down in the buffer sleeve 11. This allows the valve stem of the minimum flow regulating valve to move the valve core 12 up and down under external force. When the pressure reducing valve assembly 1 is open, the pressurized liquid can enter the buffer sleeve 11 through the inlet channel 212, and after multiple buffering and pressure reduction, it flows out through the overflow hole 113 into the buffer chamber, and finally is discharged through the drain channel 213. Since the circumferential gap between the multiple buffer columns 122 and the corresponding flow equalization ring 111 can be adjusted synchronously, the minimum flow regulating valve can adjust the flow rate as needed while reducing pressure.

[0050] like Figures 9-13 As shown, in this embodiment, the valve core 12 further includes an opening / closing head 124 coaxially disposed at the lower end of the valve core rod 121 and located directly above the connection between the liquid inlet channel 212 and the valve chamber 211. The opening / closing head 124 is used to block the liquid inlet channel 212 when the valve core 12 moves down to its limit position. When the liquid inlet channel 212 is blocked, each of the buffer columns 122 blocks the corresponding flow equalization ring 111. In this way, the opening / closing head 124 can block the liquid inlet channel 212, and at the same time, multiple flow equalization rings 111 are also in a blocked state. At this time, the entire minimum flow regulating valve is in a closed state. Even if the multiple flow equalization rings 111 are not tightly blocked, the opening / closing head 124 can still play a role in intercepting the flow. When multiple flow equalization rings 111 are all in an open state, the opening / closing head 124 will definitely open the liquid inlet channel 212.

[0051] In this embodiment, the length reserved at the lower end of the valve core rod 121 must be sufficient to ensure that when the pressure reducing valve assembly 1 is in a blocked state, the opening and closing head 124 just abuts against the liquid inlet channel 212 to block the liquid inlet channel 212 (which also forms a barrier).

[0052] In this embodiment, the opening and closing head 124 can be used as the main gate in the minimum flow regulating valve (since the liquid fluid at the inlet channel 212 is under pressure, the function of the opening and closing head 124 in regulating the flow rate is not obvious), while the multiple buffer columns 122 are equivalent to secondary gates (which can reduce pressure and regulate the flow rate). Especially when the minimum flow regulating valve is in the closed state, leakage can be avoided.

[0053] like Figures 9-13 As shown (in this embodiment, three buffer ribs 123 are used as an example in each buffer ring groove 126), the lower end of the opening / closing head 124 in this embodiment is convex spherical (the structure of the opening / closing head 124 in this embodiment is similar to the structure of the buffer column 122). This allows it to have a good sealing effect on the liquid inlet channel 212. When it is opened, it can also divert the liquid flow entering the buffer sleeve 11 to the outside to avoid turbulence. The multiple buffer ribs 123 located at the lowest end extend to connect with the opening / closing head 124, and the diameter of the upper end of the opening / closing head 124 is the same as the diameter of the upper end of the buffer column 122.

[0054] like Figure 14 As shown, in this embodiment, a buffer ring groove 126 can also be formed between the opening / closing head 124 and the lowermost buffer column 122. The lowermost buffer ring groove 126 is also divided into multiple buffer grooves 1261, thereby further improving the pressure reduction effect of the liquid fluid.

[0055] In this embodiment, multiple overflow holes 113 are provided, and the multiple overflow holes 113 are distributed circumferentially at intervals on the upper end of the buffer sleeve 11. This ensures that the overflow flow rate at the upper end of the buffer sleeve 11 meets the requirements, and avoids pressure buildup and jet formation due to poor drainage at the upper end of the buffer sleeve 11 (once a jet is formed, the pressure of the liquid discharged through the drainage channel 213 may increase).

[0056] like Figures 9-13As shown, in this embodiment, the valve core 12 further includes a piston rod 125 coaxially protruding on the valve core rod 121. The plurality of buffer rods 122 are all located below the piston rod 125. The piston rod 125 is slidably disposed in the uppermost expansion cavity 112, which is used to block the upper end of the buffer sleeve 11. When the valve core 12 blocks the plurality of flow equalization rings 111, the piston rod 125 blocks the overflow hole 113, or when the valve core 12 opens the plurality of flow equalization rings 111, the piston rod 125 opens the overflow hole 113. This ensures that the piston rod 125 always blocks the upper end of the buffer sleeve 11 during the up-and-down movement of the valve core 12 (thus preventing the liquid flow from impacting the sealing performance of the valve stem passage 231). The overflow hole 113 is located at the lower end of the sliding trajectory of the piston rod 125, so that the liquid flow through the buffer sleeve 11 can only flow out through the overflow hole 113. Moreover, when multiple flow equalization rings 111 are in a blocked state, even if leakage occurs, the piston rod 125 will block the overflow hole 113, which will act as the final interception barrier.

[0057] In this embodiment, the piston rod 125 in the uppermost expansion cavity 112 is equivalent to a piston, and the overflow hole 113 is located at the lower end of the sliding trajectory of the piston rod 125. This ensures that even when the entire pressure reducing valve assembly 1 is in the open state, the upper end of the buffer sleeve 11 is blocked by the piston rod 125, but the flow equalization ring 111 and the overflow hole 113 are also in the open state. When the entire pressure reducing valve assembly 1 is in the blocked state, each flow equalization ring 111 is blocked by the corresponding buffer rod 122, and the piston rod 125 also blocks the overflow hole 113.

[0058] In this embodiment, when the pressure reducing valve assembly 1 is in a blocked state, the piston rod 125 can also form a barrier by blocking multiple overflow holes 113.

[0059] Preferred, such as Figure 12 and Figure 13 As shown, in this embodiment, the upper end of the buffer sleeve 11 can be turned inward to form a reduced diameter ring 114 (equivalent to increasing the wall thickness of the upper end of the buffer sleeve 11 to increase its structural strength). The reduced diameter ring 114 is also located at the upper end of the uppermost expanded diameter cavity 112. The overflow hole 113 is located at the lower end of the reduced diameter ring 114. The diameter of the piston rod 125 is consistent with the inner diameter of the reduced diameter ring 114, and the piston rod 125 is in sealing sliding contact with the inner wall of the reduced diameter ring 114 (when the valve core 12 moves up and down, the piston rod 125 moves up and down inside the reduced diameter ring 114).

[0060] In this embodiment, the opening / closing head 124 and piston rod 125 can also be integrally formed with the valve core rod 121.

[0061] like Figure 9 and Figure 10 As shown, in this embodiment, the liquid inlet channel 212 is provided with a liquid inlet chamber 2121 in the middle, and a filter cover 2122 is provided inside the liquid inlet chamber 2121. This can filter the liquid flowing into the buffer sleeve 11 to prevent residue from entering the buffer sleeve 11 and causing the valve core 12 to get stuck or its surface to wear.

[0062] In this embodiment, the filter cover 2122 can be in the shape of a tank, with filter holes evenly distributed on its tank wall and bottom wall. The slot end of the filter cover 2122 can be embedded in the connection between the liquid inlet channel 212 and the valve chamber 211.

[0063] like Figure 9 and Figure 10 As shown, in this embodiment, the valve housing 2 includes a valve body 21, a valve cover ring 22, and a packing chamber 23. The valve cavity 211, the inlet channel 212, and the outlet channel 213 are all disposed on the valve body 21. The upper end of the valve body 21 is coaxially provided with an insert hole 214 communicating with the outside. The valve stem channel 231 coaxially penetrates the packing chamber 23 (in this embodiment, the lower end of the valve stem channel 231 can be expanded to allow the piston rod 125 to move upwards). During sliding, its upper end can extend into the valve stem channel 231 and limit the upward stroke of the valve core 12. The lower end of the packing chamber 23 is turned outward to form an abutment ring 232. The lower end of the packing chamber 23 extends coaxially into the mounting hole 214 and abuts against the buffer sleeve 11. The valve cover ring 22 is fitted over the packing chamber 23 and connected to the upper end of the valve body 21 to press the packing chamber 23 onto the valve body 21. This makes the structure of the entire valve body 2 simple, easy to assemble, and provides excellent sealing.

[0064] In this embodiment, one end of the liquid inlet channel 212 is located on the outer side wall of the valve body 21, and its end bends straight up to communicate with the middle of the lower end of the valve cavity 211. The liquid inlet cavity 2121 is located at the bend of the liquid inlet channel 212.

[0065] In this embodiment, the fitting hole 214 and the abutment ring 232, as well as the abutment points between the two ends of the buffer sleeve 11 and the valve body 2, need to be sealed (the sealing method is existing technology and will not be described in detail here) to prevent liquid from seeping out of the valve body 2.

[0066] like Figure 9 and Figure 10As shown, in this embodiment, the valve body 2 further includes multiple tensioning bolts 24. The valve cover ring 22 is provided with multiple vertically penetrating connecting holes 221 spaced circumferentially. The upper end of the valve body 21 is provided with multiple threaded holes 215 spaced circumferentially. The multiple connecting holes 221, the multiple threaded holes 215, and the multiple tensioning bolts 24 correspond one-to-one. Each tensioning bolt 24 passes through the corresponding connecting hole 221 and is threadedly connected to the corresponding threaded hole 215 to install the valve cover ring 22 on the upper end of the valve body 21. This makes the overall structural strength of the valve body 2 higher, and the abutment pressure of the packing chamber 23 on the buffer sleeve 11 is evenly distributed, which is beneficial to improving the sealing effect.

[0067] In this embodiment, 3-10 tensioning bolts 24 can be provided, preferably 4 or 5 tensioning bolts 24.

[0068] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pressure reducing valve assembly, characterized in that, The system includes a vertically arranged buffer sleeve (11) and a valve core (12). The lower end of the buffer sleeve (11) is the inlet end, and the upper end is the outlet end. Multiple vertically spaced flow equalization rings (111) are coaxially protruding inside the buffer sleeve (11). These multiple flow equalization rings (111) axially divide the buffer sleeve (11) into multiple expansion chambers (112), with one flow equalization ring (111) between any two adjacent expansion chambers (112). The valve core (12) includes a valve core rod (121) and multiple buffer pillars (122). The multiple buffer pillars (122) are coaxially protruding on the valve core rod (121) and are positioned within the valve core. The valve core rod (121) is vertically spaced, and the inner diameter of the flow equalization ring (111) is the same as the diameter of the buffer column (122). The valve core rod (121) coaxially passes through the buffer sleeve (11), and the multiple flow equalization rings (111) correspond one-to-one with the multiple buffer columns (122). Each buffer column (122) is located in the corresponding flow equalization ring (111). The lower end of each buffer column (122) is a convex arc surface. Under the action of external force, the valve core rod (121) drives the multiple buffer columns (122) to move up and down relative to the buffer sleeve (11) so as to open or block the multiple flow equalization rings (111) simultaneously.

2. The pressure reducing valve assembly according to claim 1, characterized in that, At least three buffer ribs (123) are evenly spaced along the circumferential direction at the lower end of each buffer column (122) on the valve core rod (121). The buffer ribs (123) are distributed radially along the valve core rod (121), and the side of each buffer rib (123) facing away from the valve core rod (121) is flush with the edge of the buffer column (122).

3. The pressure reducing valve assembly according to claim 2, characterized in that, The multiple buffer ribs (123) of two adjacent rings are staggered.

4. A minimum flow regulating valve, characterized in that, The assembly includes a valve housing (2), a valve stem (3), and a pressure reducing valve assembly (1) as described in any one of claims 1-3. The valve housing (2) has a valve cavity (211) inside. A valve stem channel (231) is vertically arranged at the upper end of the valve housing (2) and is coaxially distributed and connected to the valve cavity (211). The valve housing (2) is provided with an inlet channel (212) coaxially connected to the lower end of the valve cavity (211) and a drain channel (213) penetrating the side wall of the valve cavity (211). A buffer sleeve (11) is coaxially embedded in the valve cavity (211). There is an annular buffer chamber between the valve cavity (211) and the side wall. An overflow hole (113) is provided on the side wall of the uppermost expansion cavity (112). The drain channel (213) and the overflow hole (113) are both connected to the buffer chamber. The inlet channel (212) is aligned with the lower end of the buffer sleeve (11). The valve stem (3) slides through the valve stem channel (231) in a sealed manner, and its lower end is coaxially connected to the upper end of the valve core rod (121). Under the action of external force, the valve stem (3) drives the valve core (12) to move up and down in the buffer sleeve (11).

5. The minimum flow regulating valve according to claim 4, characterized in that, The valve core (12) also includes an opening and closing head (124) coaxially disposed at the lower end of the valve core rod (121) and located directly above the connection between the liquid inlet channel (212) and the valve chamber (211). The opening and closing head (124) is used to block the liquid inlet channel (212) when the valve core (12) moves down to the limit position. When the liquid inlet channel (212) is blocked, each of the buffer columns (122) blocks the corresponding flow equalization ring (111).

6. The minimum flow regulating valve according to claim 4, characterized in that, The overflow holes (113) are provided in multiple ways, and the multiple overflow holes (113) are distributed circumferentially at intervals at the upper end of the buffer sleeve (11).

7. The minimum flow regulating valve according to any one of claims 4-6, characterized in that, The valve core (12) also includes a piston rod (125) coaxially protruding on the valve core rod (121). Multiple buffer rods (122) are located below the piston rod (125). The piston rod (125) is slidably disposed in the uppermost expansion cavity (112) to block the upper end of the buffer sleeve (11). When the valve core (12) blocks multiple flow equalization rings (111), the piston rod (125) blocks the overflow hole (113). Or when the valve core (12) opens multiple flow equalization rings (111), the piston rod (125) opens the overflow hole (113).

8. The minimum flow regulating valve according to any one of claims 4-6, characterized in that, The liquid inlet channel (212) is provided with a liquid inlet chamber (2121) in the middle, and a filter cover (2122) is provided in the liquid inlet chamber (2121).

9. The minimum flow regulating valve according to any one of claims 4-6, characterized in that, The valve housing (2) includes a valve body (21), a valve cover ring (22), and a packing chamber (23). The valve cavity (211), the liquid inlet channel (212), and the liquid outlet channel (213) are all located on the valve body (21). The upper end of the valve body (21) is coaxially provided with an insert hole (214) communicating with the outside. The valve stem channel (231) coaxially passes through the packing chamber (23). The lower end of the packing chamber (23) is turned outward to form an abutment ring (232). The lower end of the packing chamber (23) coaxially extends into the insert hole (214) and abuts against the buffer sleeve (11). The valve cover ring (22) is sleeved outside the packing chamber (23) and connected to the upper end of the valve body (21) to press the packing chamber (23) onto the valve body (21).

10. The minimum flow regulating valve according to claim 9, characterized in that, The valve housing (2) also includes multiple tension bolts (24). The valve cover ring (22) is provided with multiple vertical through-holes (221) spaced apart along the circumferential direction. The upper end of the valve body (21) is provided with multiple threaded holes (215) spaced apart along the circumferential direction. The multiple through-holes (221), multiple threaded holes (215) and multiple tension bolts (24) correspond one-to-one. Each tension bolt (24) passes through the corresponding through-hole (221) and is threadedly connected to the corresponding threaded hole (215) to install the valve cover ring (22) on the upper end of the valve body (21).

Images