A high pressure difference pressure reducing and noise reducing labyrinth disc and pressure reducing valve

Abstract

The present invention relates to a high-pressure differential pressure-reducing and noise-reducing labyrinth disc and a pressure-reducing valve, wherein the labyrinth disc comprises a disc substrate and at least two labyrinth channels distributed in an annular array on the disc substrate, each of the labyrinth channels comprises at least two inlet channels, at least one outlet channel, and a circuitous pressure-reducing channel connected between the inlet channel and the outlet channel; the circuitous pressure-reducing channel comprises a plurality of groups of pressure-reducing channels arranged in groups of two, each of the pressure-reducing channels comprises a circuitous straight line portion and a circuitous annular portion connected in parallel, and an outflow straight line portion connected to the output end of the circuitous straight line portion; the pressure-reducing valve comprises a valve body, a valve cover, a valve stem, a valve core, and a labyrinth disc. The present invention designs the circuitous pressure-reducing channel as a multi-channel circuitous structure, which greatly prolongs the flow channel distance of the fluid passing through the labyrinth disc within a limited space, increases the pressure-reducing stages of the channel, and makes the step-by-step pressure reduction more stable.

Description

Technical Field

[0001] The invention belongs to the field of valves, and in particular relates to a high-pressure difference pressure-reducing and noise-reducing labyrinth disc and a pressure-reducing valve. Background Art

[0002] The pressure reducing valve is a special device used to adjust flow and pressure, and is widely used in water supply systems of hydropower stations, mines, gas pipelines, etc. Traditional sleeve-type pressure reducing valves generally use hole-type sleeves or simple pipe bends, resulting in poor pressure reduction effect and low space utilization.

[0003] For labyrinth pressure reducing valves, although the existing disc design structure ideas are different, their labyrinth flow channels are mostly single-channel structures, which either have a small number of pressure reduction stages and a small pressure reduction amplitude under a certain size, or have low space utilization and a small scope of application. Similarly, labyrinth discs with a spiral labyrinth channel structure, such as the labyrinth disc described in patent application CN202210038997.4, have a low pressure reduction degree and low flow channel utilization.

[0004] In short, the existing labyrinth disc throttling effect is limited, and the effect is not ideal under high temperature, high pressure difference, and high flow rate conditions. Therefore, how to effectively improve the pressure relief effect of the pressure reducing valve by changing the structure of the flow channel on the disc and reduce the noise as much as possible is a technical problem that needs to be solved urgently. Summary of the invention

[0005] The purpose of the present invention is to provide a high-pressure difference pressure-reducing and noise-reducing labyrinth disc and a pressure-reducing valve in order to solve the above-mentioned problems.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0007] The present invention provides a high-pressure difference pressure-reducing and noise-reducing labyrinth disc, comprising a disc substrate and at least two labyrinth flow channels distributed in an annular array on the disc substrate, each of the labyrinth flow channels comprising at least two inlet flow channels, at least one outlet flow channel and a circuitous pressure-reducing flow channel connected between the inlet flow channel and the outlet flow channel;

[0008] The detour pressure reducing flow channel comprises a plurality of groups of pressure reducing flow channels arranged in a group of two, wherein the plurality of groups of pressure reducing flow channels are staggeredly connected in sequence from the inlet flow channel to the outlet flow channel, and each pressure reducing flow channel comprises a detour straight line portion and a detour annular portion connected in parallel, and an outflow straight line portion connected to the output end of the detour straight line portion, and two adjacent pressure reducing flow channels are connected via the outflow straight line portion.

[0009] As a further optimization solution of the present invention, the labyrinth flow channel is formed by a groove opened on the disc substrate, or is formed by a valley formed between a plurality of protrusions arranged on the disc substrate.

[0010] As a further optimization scheme of the present invention, the cross-sections of the inlet flow channel and the outlet flow channel are set to be rectangular or trumpet-shaped, and the output end widths of the trumpet-shaped inlet flow channel and the outlet flow channel are greater than the input end widths.

[0011] As a further optimization scheme of the present invention, the inlets and outlets of the detour straight line portion and the detour annular portion are connected and intersect with the outflow straight line portion. The flow channel width of the detour straight line portion and the detour annular portion is the same, and its width is 0.5-1.25 times the width of the inlet flow channel.

[0012] As a further optimization solution of the present invention, the angle between the inlet flow channel and the circuitous straight line portion is a1, 30°≤a1≤150°.

[0013] As a further optimization scheme of the present invention, the total length of the circuitous annular portion flow channel is 3-9 times the width of the inlet flow channel, the length of the outlet straight portion flow channel is 1-8 times the width of the inlet flow channel, and the outlet flow channel width is 1-2.5 times the width of the inlet flow channel.

[0014] The present invention also provides a pressure reducing valve, comprising a valve body, a valve cover, a valve stem and a valve core, the pressure reducing valve also comprising the above-mentioned high pressure difference pressure reducing and noise reducing labyrinth disc;

[0015] The high-pressure difference pressure-reducing and noise-reducing labyrinth discs are arranged in two groups, each group being arranged in multiple layers. The two groups of high-pressure difference pressure-reducing and noise-reducing labyrinth discs respectively form an inner sleeve and an outer sleeve, and multiple layers of pressure-reducing flow channels are respectively formed on the inner sleeve and the outer sleeve. The inner sleeve and the outer sleeve are coaxially arranged in the valve cavity with a gap therebetween, and the pressure-reducing flow channel is used to connect the pressure-reducing valve inlet and the valve port.

[0016] A jet structure is provided between the gap and the valve port, and the outlet of the jet structure corresponds to the position where a flow vortex is formed in the valve cavity;

[0017] The valve core includes an inner core body and an outer core body arranged coaxially, the outer core body cooperates with the outer wall of the outer sleeve, the inner core body cooperates with the inner wall of the inner sleeve, the valve port and the outlet of the jet structure, and the valve stem drives the valve core to move up and down to simultaneously open and close the pressure reducing flow channel, the valve port and the jet structure.

[0018] As a further optimization scheme of the present invention, the bottom end surface of the valve cover is set to be annular and extends through the valve cavity to above the valve port, the top end surfaces of the inner sleeve and the outer sleeve cooperate with the bottom end surface of the valve cover, the bottom ends of the inner sleeve and the outer sleeve are connected to the outside of the valve port, and a cylindrical cavity is formed between the outer wall of the valve cover and the valve body in the valve cavity, the outer core body is slidably arranged in the cylindrical cavity, and the top end of the outer core body penetrates the valve cover through a connecting rod and is fixedly connected to the valve stem, and the top end of the inner core body penetrates the valve cover and is fixedly connected to the valve stem.

[0019] As a further optimization scheme of the present invention, the phase angle between the decompression flow channel on the inner sleeve and the decompression flow channel on the outer sleeve is 3.75°, the flow rates of the 1st to 4th layers of decompression flow channels distributed from bottom to top are distributed according to the first curve, and the flow rates of the 5th to Nth layers of decompression flow channels are distributed according to the second curve;

[0020] The first curve is a quadratic curve, y1=ax 2 +bx, where 1≤x≤4,

[0021] The second curve is a first-order curve, y2=cx+5, where 5≤x≤N,

[0022] The calculation formula for the number of the X-th layer of pressure relief channels distributed from bottom to top along the axial direction is as follows:

[0023] z X =Z*(y X -y X-1 ) / N

[0024] Among them, z X is the number of pressure relief channels in the Xth layer, Z is the total number of channels, y X is the flow rate of the X-th layer of pressure relief channel, 1≤X≤N, and N is the total number of layers.

[0025] As a further optimization solution of the present invention, the number of the jet structures is at least three and they are evenly distributed on the inlet side of the valve cavity, and the angle between two adjacent jet structures is 30°;

[0026] Each of the jet structures is a three-way channel including a jet inlet and two jet outlets, wherein the jet inlet is connected to the gap between the two sleeves, one jet outlet is located on the side of the valve cavity away from the water outlet, and the other jet outlet is located below the valve port.

[0027] As a further optimization scheme of the present invention, the two jet outlets of the jet structure are jet outlet A and jet outlet B, the diameters of jet outlet A and jet outlet B are r1 and r2, respectively, and the angles between the axes of jet outlet A and jet outlet B and the axis of the valve core are α and β, wherein 30°≤α≤75°, 30°≤β≤60°.

[0028] The beneficial effects of the present invention are:

[0029] 1) The present invention designs the circuitous pressure reducing flow channel as a multi-channel circuitous structure, thereby greatly extending the flow channel distance of the fluid passing through the labyrinth disk within a limited space, increasing the number of pressure reduction stages of the flow channel, and making the step-by-step pressure reduction more stable;

[0030] 2) The labyrinth flow channel disc of the present invention allows the fluid medium to be continuously diverted and counteracted in multiple multi-channel flow channels, and continuously impacts and collides to dissipate energy. Compared with the related art, the labyrinth disc provided by the present invention has strong pressure reduction capability and stable pressure reduction effects, which can prevent the generation of cavitation and reduce the probability of cavitation.

[0031] 3) The present invention creatively opens a jet structure between the sleeve and the lower cavity of the valve body, and the fluid that has been initially decompressed by the outer sleeve enters the lower cavity of the valve body through the jet structure, and is ejected toward the vortex generated in the valve cavity due to the uneven distribution of the fluid flow rate. Since the ejected jet has only been decompressed by the outer sleeve, its pressure is slightly higher than that of the fluid in the valve cavity, and the impact effect on the flow vortex is better, so that the fluid at the local vortex flows toward the outlet along the direction of the jet, which plays a role in reducing noise;

[0032] 4) The medium used in the jet structure of the present invention is a valve medium that has been preliminarily decompressed, and no other medium will be introduced. The special valve core can simultaneously control the opening and closing of the valve and the jet mechanism, and no additional control device is required, thus simplifying the valve structure;

[0033] 5) The flow characteristics of the present invention are targeted at special application scenarios. The quick-opening flow characteristics and the linear flow characteristics are innovatively combined, and the pressure-reducing flow channel is arranged according to this special flow characteristic curve to form a flow characteristic that first opens quickly and then increases linearly, making the valve flow characteristics more applicable. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the structure of the maze disc of the present invention.

[0035] Figure 2 It is a top view of the labyrinth flow channel on the labyrinth disk of the present invention.

[0036] Figure 3 A pressure distribution cloud diagram of a labyrinth flow channel in the labyrinth disc of the present invention.

[0037] Figure 4 It is a pressure distribution cloud diagram of a general comparative labyrinth flow channel.

[0038] Figure 5 It is a three-dimensional schematic diagram of the pressure reducing valve of the present invention.

[0039] Figure 6 It is a schematic diagram of the cross-sectional structure of the pressure reducing valve of the present invention.

[0040] Figure 7 The present invention Figure 6 Schematic diagram of the structure of part A.

[0041] Figure 8 It is a partial three-dimensional schematic diagram of the present invention excluding the valve body.

[0042] In the figure: 1. disc base; 2. central cavity; 3. labyrinth flow channel; 31. inlet flow channel; 32. circuitous straight line portion; 33. circuitous annular portion; 34. outflow straight line portion; 35. outlet flow channel; 100. valve body; 200. valve cover; 300. valve stem; 4. inner core body; 5. outer core body; 6. inner sleeve; 7. outer sleeve; 8. jet structure; 81. jet inlet; 82. jet outlet A; 83. jet outlet B; 9. connecting rod. DETAILED DESCRIPTION

[0043] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0044] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. 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, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; in the description of the present invention, unless otherwise specified, "multiple" and "several" mean two or more.

[0045] Example 1

[0046] like Figure 1-4 As shown, a high-pressure difference pressure-reducing and noise-reducing labyrinth disc comprises a disc substrate 1 and at least two labyrinth channels 3 distributed in a ring array on the disc substrate 1. The disc substrate 1 is arranged in a ring shape, and the interior is a central cavity 2; the labyrinth channel 3 is composed of grooves opened on the disc substrate 1, or is composed of valleys formed between a plurality of protrusions arranged on the disc substrate 1.

[0047] Each of the labyrinth flow channels 3 includes at least two inlet flow channels 31, at least one outlet flow channel 35, and a circuitous pressure-reducing flow channel connected between the inlet flow channel 31 and the outlet flow channel 35;

[0048] The detour pressure reducing flow channel includes a plurality of groups of pressure reducing flow channels arranged in a group of two, and the plurality of groups of pressure reducing flow channels are staggeredly connected in sequence from the inlet flow channel 31 to the outlet flow channel 35, and each pressure reducing flow channel includes a detour straight line portion 32 and a detour annular portion 33 connected in parallel, and an outflow straight line portion 34 connected to the output end of the detour straight line portion 32, and two adjacent pressure reducing flow channels are connected via the outflow straight line portion 34; wherein the inlets and outlets of the detour straight line portion 32 and the detour annular portion 33 are connected, and intersect and connect with the outflow straight line portion 34.

[0049] The width of the inlet flow channel 31 is set to b, then

[0050] The width of the flow channel of the winding straight line portion 32 is m, 0.5≤m / b≤1.25;

[0051] The width of the flow channel of the winding annular portion 33 is n, 0.5≤n / b≤1.25;

[0052] The total length of the flow channel of the circuitous annular portion 33 is w, 3≤w / b≤9;

[0053] The length of the flow channel of the outflow straight portion 34 is p, 1≤p / b≤8;

[0054] The width of the outlet flow channel 35 is d, 1≤d / b≤2.5;

[0055] The included angle between the inlet flow channel 31 and the winding straight line portion 32 is a1, and 30°≤a1≤150°.

[0056] The total width of the channel outlet on each of the labyrinth flow channels 3 is not less than the total width of the channel inlet.

[0057] In an embodiment of the present invention, the number of labyrinth channels 3 on the disc substrate 1 may be two, three or even more. Generally speaking, when the fluid pressure at the inlet and outlet is fixed, as the number of labyrinth channels 3 increases, the flow rate of the fluid passing through the labyrinth channels 3 also increases, and the flow capacity of the labyrinth disc also gradually increases.

[0058] The labyrinth flow channel 3 is evenly arranged on the disc substrate 1. For the convenience of description, the labyrinth flow channel 3 is referred to as Figure 1 The example in which sixteen labyrinth channels 3 are arranged on the disc substrate 1 and the labyrinth channels 3 include six groups of detour straight line portions 32, detour annular portions 33, and outflow straight line portions 34 is used for explanation. Along the flow direction, each labyrinth channel 3 includes an inlet channel 31, a detour straight line portion 32, a detour annular portion 33, an outflow straight line portion 34, and an outlet channel 35 connected in sequence. The outlet channel 35 extends radially along the disc substrate 1.

[0059] like Figure 2As shown, generally speaking, the cross-sections of the inlet flow channel 3131 and the outlet flow channel 3538 are set to be rectangular, that is, the cross-sectional shape and size of the inlet flow channel 3131 remain unchanged in the extension direction of the inlet flow channel 3131, and the cross-sectional shape and size of the outlet flow channel 3538 remain unchanged in the extension direction of the outlet flow channel 3538.

[0060] Of course, in some embodiments, the inlet flow channel 3131 and the outlet flow channel 3538 can also be designed to be trumpet-shaped, that is, the width of the outlet end of the inlet flow channel 3131 is greater than the width of the inlet end of the inlet flow channel 3131, and the width of the outlet end of the outlet flow channel 3538 is greater than the width of the inlet end of the outlet flow channel 3538.

[0061] like Figure 3 , Figure 4 As shown, by comparing the labyrinth flow channel 3 with a similar design, it can be found that under the same inlet pressure and the same flow channel inlet size, the labyrinth flow channel 3 of the present invention uses multiple circuitous straight sections 32 and circuitous annular sections 33 for diversion and counterpressure reduction, so that the fluid medium collides violently at the outlets of the two, greatly blocking the flow of the fluid medium, and continuously dissipating the energy of the fluid medium to reduce the pressure. Through the reasonable arrangement of the circuitous straight sections 32 and the circuitous annular sections 33, the fluid medium is distributed more evenly on the cross section of the labyrinth flow channel of the present invention, and there are fewer local high-pressure areas.

[0062] also, Figure 3 , Figure 4 By comparison, it can be seen that the present invention makes the pressure of the fluid medium drop to a certain extent each time it passes through a turning point, so that the pressure is reduced step by step, and flash evaporation and cavitation are not likely to occur, thereby achieving a truly graded pressure reduction. At the same time, under this high pressure condition, each confluent outlet makes the fluid flow a certain distance in the outflow straight line portion 34, and the pressure drop is more uniform than the control ratio, effectively utilizing the space of the labyrinth flow channel 3 for stable pressure reduction, greatly increasing the number of pressure reduction stages, and the flow channels are reasonably arranged on the disc, with a higher space utilization rate and a significant pressure reduction effect, which is suitable for use under high temperature, high pressure difference, and high flow rate conditions.

[0063] In summary, the fluid medium flows in the labyrinth flow channel 3 of the present invention, and the fluid medium is continuously diverted through the circuitous straight line portion 32 and the circuitous annular portion 33 in the circuitous pressure reducing flow channel. At the intersection of the two, the fluid medium continuously impacts each other and dissipates energy due to different flow directions, causing internal resistance loss of the medium, reducing its energy and reducing pressure. The setting of the outflow straight line portion 34 allows the fluid flowing out of the confluence to be fully developed and flow more smoothly. At the same time, multiple groups of circuitous straight line portions 32, circuitous annular portions 33 and outflow straight line portions 34 are designed, so that under high pressure, the fluid pressure drop is more gentle, reducing cavitation and cavitation.

[0064] like Figure 5-8As shown, the present invention also provides a pressure reducing valve, including a valve body 100, a valve cover 200, a valve stem 300, a high pressure difference pressure reducing and noise reducing labyrinth disc, a valve core and a jet structure 8;

[0065] The high-pressure difference pressure-reducing and noise-reducing labyrinth discs are arranged in two groups, each group being arranged in multiple layers. The two groups of high-pressure difference pressure-reducing and noise-reducing labyrinth discs respectively form an inner sleeve 6 and an outer sleeve 7, and multiple layers of pressure-reducing flow channels are respectively formed on the inner sleeve 6 and the outer sleeve 7;

[0066] The valve cover 200 is arranged on the upper part of the valve body 100, and the bottom end surface of the valve cover 200 is arranged in an annular shape and extends through the valve cavity to the top of the valve port, and is used to fix the inner sleeve 6 and the outer sleeve 7 at the bottom. A through hole is provided at the top end of the valve cover 200 for the axial movement of the valve core, the valve cover 200;

[0067] The valve core, the inner sleeve 6 and the outer sleeve 7 are coaxially arranged in the valve cavity inside the valve body 100 from the inside to the outside, the top surfaces of the inner sleeve 6 and the outer sleeve 7 are matched with the bottom surface of the valve cover 200, and the bottom ends of the inner sleeve 6 and the outer sleeve 7 are connected to the outside of the valve port;

[0068] A jet structure 8 is provided between the gap between the two sleeves and the valve port. The jet structure 8 is a channel with a constant diameter, and its inlet shape is preferably circular. The bottom of the gap between the inner sleeve 6 and the outer sleeve 7 is the jet inlet. The jet structures 8 are at least three and are evenly distributed on the inlet side of the valve cavity. The angle between two adjacent jet structures 8 is 30°. The outlet of the jet structure 8 corresponds to the position where a flow vortex is formed in the valve cavity. The fluid that has been initially depressurized by the outer sleeve 7 is directly led to the position of the vortex in the lower end of the valve cavity through the jet structure 8 to eliminate the vortex and reduce noise.

[0069] Specifically, each of the jet structures 8 is a three-way channel including a jet inlet 81 and two jet outlets A and B, wherein the jet inlet 81 is connected to the gap between the two sleeves, the jet outlet A82 is located on the side of the valve cavity away from the water outlet, and the jet outlet B83 is located below the valve port. The diameters of the jet outlet A82 and the jet outlet B83 are r1 and r2 respectively, and the angles between the axes of A and B and the axis of the valve core are α and β. α=60°,β=45°;

[0070] The valve core includes an inner core body 4 and an outer core body 5 which are coaxially arranged. The outer core body 5 cooperates with the outer wall of the outer sleeve 7, and the inner core body 4 cooperates with the inner wall of the inner sleeve 6, the valve port and the outlet of the jet structure 8. The valve stem 300 drives the valve core to move up and down to open and close the pressure relief channel, the valve port and the jet structure 8 at the same time.

[0071] A cylindrical cavity is formed between the outer wall of the valve cover 200 and the valve body 100 in the valve cavity, the outer core 5 is slidably arranged in the cylindrical cavity, and the top end of the outer core 5 passes through the valve cover 200 through the connecting rod 9 and is fixedly connected to the valve stem 300, the top end of the inner core 4 passes through the valve cover 200 and is fixedly connected to the valve stem 300, the inner core 4 and the outer core 5 are detachably connected to the valve stem 300, the connecting rod 9 can be set to four, and the corresponding connecting rod 9 on the valve cover 200 is set to four through holes, and the connecting rod 9 cooperates with the through holes to limit the movement range of the valve core itself;

[0072] The outer walls of the two sleeves are provided with a decompression channel for connecting the inlet and the valve port of the regulating valve, wherein the decompression channel on the inner sleeve 6 is the inner decompression channel, and the decompression channel on the outer sleeve 7 is the outer decompression channel, the inner decompression channel and the outer decompression channel are the same and the phase angle between the two is 3.75°;

[0073] Each set of high-pressure differential pressure-reducing and noise-reducing labyrinth discs is provided with N layers, and each layer has multiple pressure-reducing flow channels distributed in a circular array along the outer wall of the sleeve:

[0074] The number of the 1st to 4th layers of pressure relief channels distributed from bottom to top along the axial direction is distributed according to the first curve, and the number of the 5th to Nth layers of pressure relief channels is distributed according to the second curve;

[0075] The first curve is a quadratic curve. Where 1≤x≤4, y1 represents the flow rate of the 1st to 4th layer of pressure relief flow channel;

[0076] The second curve is a first-order curve. Where 5≤x≤N, y2 represents the flow rate of the 5th to 20th layer of decompression flow channel;

[0077] The calculation formula for the number of the X-th layer of pressure relief channels distributed from bottom to top along the axial direction is as follows:

[0078] z X =Z*(y X -y X-1 ) / N

[0079] Among them, z X is the number of pressure relief channels in the Xth layer, Z is the total number of channels, y X is the flow rate of the X-th layer of pressure relief channel, 1≤X≤N, and N is the total number of layers.

[0080] In this embodiment, the total number of flow channels Z=320, and the total number of layers N=20. Then, the number of flow channels distributed in layers 1-4 of this embodiment is 47, 37, 27, and 17 respectively, and the number of flow channels distributed in layers 5-20 is 12.

[0081] The number of flow channels is distributed in this way in order to obtain a special flow characteristic curve, and the flow channel width is set in order to increase the space utilization of the sleeve.

[0082] The present invention optimizes the parameters by setting specific parameters of the pressure reducing channel and the jet structure 8, making the processing easier.

[0083] Specific working principle: The valve stem 300 is used to move the valve core upward to a certain distance, the valve is opened, the pressure reducing flow channel is connected, the fluid enters from the flow channel inlet, and then the fluid is continuously diverted and counteracted through the circuitous pressure reducing flow channel, continuously impacting and colliding to dissipate energy, thereby significantly improving the pressure reducing effect of the valve;

[0084] Similarly, after further decompression by the inner sleeve 6, it enters the valve cavity and then enters the outlet cavity at the lower end of the valve cavity;

[0085] The fluid drawn out from the cylindrical cavity between the inner sleeve 6 and the outer sleeve 7 is initially decompressed by the outer sleeve 7, and then ejected from the jet structure 8 to the vortex in the lower end of the valve cavity, thereby eliminating the vortex, and then merges with the fluid after multi-stage decompression by the inner sleeve 6 and the outer sleeve 7 and flows out together;

[0086] By adjusting the up and down position of the valve core, fast opening under small opening and linear flow characteristics under large opening can be achieved.

[0087] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A pressure reducing valve, comprising a valve body, a valve cover, a valve stem and a valve core, characterized in that: It also includes a high-pressure differential pressure-reducing and noise-reducing labyrinth disc; The high-pressure difference pressure-reducing and noise-reducing labyrinth disc comprises a disc substrate and at least two labyrinth flow channels distributed in an annular array on the disc substrate, each of the labyrinth flow channels comprises at least two inlet flow channels, at least one outlet flow channel and a circuitous pressure-reducing flow channel connected between the inlet flow channel and the outlet flow channel; the circuitous pressure-reducing flow channel comprises a plurality of groups of pressure-reducing flow channels arranged in groups of two, the plurality of groups of pressure-reducing flow channels are staggeredly connected in sequence from the inlet flow channel to the outlet flow channel, each pressure-reducing flow channel comprises a circuitous straight line portion and a circuitous annular portion connected in parallel and an outflow straight line portion connected to an output end of the circuitous straight line portion, and two adjacent pressure-reducing flow channels are connected via the outflow straight line portion; The high-pressure difference pressure-reducing and noise-reducing labyrinth discs are arranged in two groups, each group being arranged in multiple layers. The two groups of high-pressure difference pressure-reducing and noise-reducing labyrinth discs respectively form an inner sleeve and an outer sleeve, and multiple layers of pressure-reducing flow channels are respectively formed on the inner sleeve and the outer sleeve. The inner sleeve and the outer sleeve are coaxially arranged in the valve cavity with a gap therebetween, and the pressure-reducing flow channel is used to connect the pressure-reducing valve inlet and the valve port. A jet structure is provided between the gap and the valve port, and the outlet of the jet structure corresponds to the position where a flow vortex is formed in the valve cavity; The valve core comprises an inner core body and an outer core body which are coaxially arranged, the outer core body cooperates with the outer wall of the outer sleeve, the inner core body cooperates with the inner wall of the inner sleeve, the valve port and the outlet of the jet structure, and the valve stem drives the valve core to move up and down to open and close the pressure reducing flow channel, the valve port and the jet structure at the same time; The phase angle between the decompression flow channel on the inner sleeve and the decompression flow channel on the outer sleeve is 3.75°, the flow rates of the 1st to 4th layers of decompression flow channels distributed from bottom to top are distributed according to the first curve, and the flow rates of the 5th to Nth layers of decompression flow channels are distributed according to the second curve; The first curve is a quadratic curve, , where x is the number of layers of the pressure relief channel, , ; Represents the flow rate of the 1st to 4th layer pressure relief flow channel; The second curve is a first-order curve, ,in ; represents the flow rate of the 5-N layer pressure relief channel; The calculation formula for the number of the x-th layer of pressure relief channels distributed from bottom to top along the axial direction is as follows: ； in, is the number of pressure relief channels in the xth layer, is the total number of flow channels, is the flow rate of the x-th layer of pressure relief channel, , N is the total number of layers.

2. A pressure reducing valve according to claim 1, characterized in that: The bottom end surface of the valve cover is arranged in an annular shape and extends through the valve cavity to above the valve port. The top end surfaces of the inner sleeve and the outer sleeve cooperate with the bottom end surface of the valve cover. The bottom ends of the inner sleeve and the outer sleeve are connected to the outside of the valve port. A cylindrical cavity is formed between the outer wall of the valve cover and the valve body in the valve cavity. The outer core body is slidably arranged in the cylindrical cavity, and the top end of the outer core body penetrates the valve cover through a connecting rod and is fixedly connected to the valve stem. The top end of the inner core body penetrates the valve cover and is fixedly connected to the valve stem.

3. A pressure reducing valve according to claim 1, characterized in that: The jet structures are provided in at least three numbers and are evenly distributed on the inlet side of the valve cavity, and the angle between two adjacent jet structures is 30°; Each of the jet structures is a three-way channel including a jet inlet and two jet outlets, wherein the jet inlet is connected to the gap between the two sleeves, one jet outlet is located on the side of the valve cavity away from the water outlet, and the other jet outlet is located below the valve port.

4. A pressure reducing valve according to claim 1, characterized in that: The labyrinth flow channel is formed by a groove formed on the disc substrate, or by a valley formed between a plurality of protrusions arranged on the disc substrate.

5. A pressure reducing valve according to claim 1, characterized in that: The cross-sections of the inlet flow channel and the outlet flow channel are set to be rectangular or trumpet-shaped, and the output end widths of the trumpet-shaped inlet flow channel and the outlet flow channel are both greater than the input end widths.

6. A pressure reducing valve according to claim 1, characterized in that: The inlets and outlets of the detour straight line portion and the detour annular portion are connected and intersect with the outflow straight line portion. The flow channel widths of the detour straight line portion and the detour annular portion are the same, and the widths thereof are 0.5-1.25 times the width of the inlet flow channel.

7. A pressure reducing valve according to claim 1, characterized in that: The angle between the inlet flow channel and the circuitous straight line portion is a1, .

8. A pressure reducing valve according to claim 1, characterized in that: The total length of the circuitous annular portion flow channel is 3-9 times the width of the inlet flow channel, the length of the outflow straight portion flow channel is 1-8 times the width of the inlet flow channel, and the width of the outlet flow channel is 1-2.5 times the width of the inlet flow channel.

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