A double sleeve type high pressure differential regulating valve with active jet structure

Abstract

The present invention relates to a double-sleeve high-pressure differential regulating valve with an active jet structure, comprising a valve body, a valve cover, a valve stem and a valve core, wherein an inner sleeve and an outer sleeve are coaxially arranged in a valve cavity inside the valve body, and a pressure reducing flow channel for connecting the inlet and the valve port of the regulating valve is opened on the outer walls of the two sleeves; a jet structure is arranged between the gap between the two sleeves 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 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 present invention can significantly improve the pressure reduction and noise reduction effects of the regulating valve by combining the double sleeve with the jet structure, and form a flow characteristic of first opening quickly and then increasing linearly, and the valve has a wider range of application.

Description

Technical Field

[0001] The invention belongs to the field of valves, and in particular relates to a double-sleeve type high-pressure differential regulating valve with an active jet structure. Background Art

[0002] Pressure reducing valve is a special device used to adjust flow and pressure, which is widely used in water supply systems of hydropower stations, mines, gas pipelines, etc. With the development of science and technology and the improvement of national development needs, especially the construction of major national projects such as hydrogen energy development and utilization and super generator sets, people are no longer satisfied with the performance of ordinary pressure reducing valves, and have put forward higher requirements for pressure reduction ratio, flow characteristics, noise reduction, etc.

[0003] Traditional high-parameter pressure reducing valves generate flow vortices due to the rapid change of flow area at the throttling element, which in turn causes excessive valve noise. There is a lack of relevant designs to eliminate flow vortices in China. In addition, the flow characteristics of domestic valves are generally designed as equal percentage, fast opening, straight line, and parabola flow characteristics. There is no flow characteristic curve design for special application scenarios, such as the flow characteristic of first fast opening and then linear growth, which results in its flow characteristics failing to meet the needs in some occasions. In addition, since traditional sleeve-type pressure reducing valves generally use hole-type sleeves or simple pipe bends, the pressure reduction effect is poor and the space utilization rate is low.

[0004] Therefore, it is necessary to propose a sleeve-type control valve with an active jet structure and a special flow channel, and improve its flow characteristics to meet the current application requirements of the sleeve-type control valve. Summary of the invention

[0005] The purpose of the present invention is to propose a double-sleeve high-pressure differential regulating valve with an active jet structure in view of the lack of sleeve-type regulating valves that can eliminate vortices in China and the lack of designs of flow characteristic curves for special application scenarios.

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

[0007] A double-sleeve type high-pressure differential regulating valve with an active jet structure, comprising a valve body, a valve cover, a valve stem and a valve core;

[0008] An inner sleeve and an outer sleeve are coaxially arranged in the valve cavity inside the valve body, and a pressure reducing flow channel for connecting the regulating valve inlet and the valve port is opened on the outer wall of the two sleeves for reducing fluid pressure;

[0009] A jet structure is provided between the gap between the two sleeves and the valve port, and the outlet of the jet structure corresponds to the position where the flow vortex is formed in the valve cavity, so as to eliminate the flow vortex at the lower end of the valve cavity;

[0010] 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.

[0011] 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, and the bottom ends of the inner sleeve and the outer sleeve are connected to the outside of the valve port.

[0012] As a further optimization scheme of the present invention, 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, the inner core body and the outer core body are detachably connected to the valve stem, the connecting rod can be set to four, and the corresponding connecting rod passing holes on the valve cover are set to four, the connecting rod and the passing holes cooperate to limit the movement range of the valve core itself.

[0013] As a further optimization solution of the present invention, the phase angle between the pressure reducing flow channel on the inner sleeve and the pressure reducing flow channel on the outer sleeve is 3.75°.

[0014] As a further optimization scheme of the present invention, the pressure reducing channels on the inner sleeve and the outer sleeve are distributed in multiple layers along the axial direction, and the number of pressure reducing channels in each layer is multiple and distributed in an annular array along the outer wall of the sleeve.

[0015] As a further optimization scheme of the present invention, the flow rates of the 1st to 4th layers of the pressure relief flow channels distributed from bottom to top along the axial direction are distributed according to the first curve, and the flow rates of the 5th to Nth layers of the pressure relief flow channels are distributed according to the second curve;

[0016] The first curve is a quadratic curve, y1=ax 2 +bx, where 1≤x≤4,

[0017] The second curve is a first-order curve, y2=cx, where 5≤x≤N,

[0018] 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:

[0019] z X =Z*(y X -y X-1 ) / N

[0020] Among them, z X is the number of pressure relief channels in the Xth layer, Z is the total number of channels, yX is the flow rate of the X-th layer of pressure relief channel, 1≤X≤N, and N is the total number of layers.

[0021] As a further optimization scheme of the present invention, the pressure reducing flow channel includes a main flow channel and three sections of secondary flow channels connected in sequence from the inlet to the outlet of the main flow channel, wherein the inlet of the first section of the secondary flow channel is connected to the valve cavity, the outlet is U-shaped and intersects with the main flow channel, and the other two sections of the secondary flow channels are heart-shaped and intersect with the main flow channel; by adding two new flow channels on both sides of the traditional main flow channel, the straight flow of the fluid at the inlet and outlet of the flow channel is changed to a tree-shaped flow trajectory that diverts flow around the main flow channel, and at the junction of the main flow channel and the secondary flow channel, the effect of impact between the diverted fluid and the mainstream fluid is achieved, thereby achieving effective pressure reduction.

[0022] As a further optimization scheme of the present invention, the width dimension relationship between the main channel and the secondary channel includes: the width of the main channel is b1, the width of the first section of the secondary channel is b2, the width of the second section of the secondary channel is c, and the width of the third section of the secondary channel is d, wherein

[0023] 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°.

[0024] As a further optimization scheme of the present invention, 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 of the jet outlets 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.

[0025] 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°.

[0026] The beneficial effects of the present invention are:

[0027] 1) 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;

[0028] 2) The present invention adds multiple sections of two secondary flow channels on both sides of the main flow channel of the traditional sleeve valve, so that the straight flow of the fluid at the flow channel inlet and the flow channel outlet is changed into a tree-shaped flow trajectory of diversion around the main flow channel. In the limited sleeve space, two inlets are added to each flow channel. At the same time, at the junction of the main flow channel and the secondary flow channel, the effect of the diversion fluid and the main flow fluid impact is achieved, which significantly improves the pressure drop of the regulating valve compared with the ordinary flow channel;

[0029] 3) 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;

[0030] 4) 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

[0031] Figure 1 It is a three-dimensional schematic diagram of the sleeve regulating valve of the present invention.

[0032] Figure 2 It is a cross-sectional view of the sleeve regulating valve of the present invention.

[0033] Figure 3 For the present invention Figure 2 Schematic diagram of the structure of part A.

[0034] Figure 4 It is a partial three-dimensional schematic diagram of the present invention excluding the valve body.

[0035] Figure 5 It is a cross-sectional view of the inner and outer sleeves of the present invention.

[0036] Figure 6 For the present invention Figure 5 Schematic diagram of the structure of part B.

[0037] Figure 7 This is the vortex distribution diagram of the sleeve-type control valve without active jet structure.

[0038] Figure 8 The figure is a vortex distribution diagram of a sleeve-type regulating valve having the active jet structure of the present invention.

[0039] Fig. 9 The flow characteristic curve of the sleeve type regulating valve having the active jet structure of the present invention.

[0040] In the figure: 1. valve body; 2. valve cover; 3. valve stem; 4. inner core; 5. outer core; 6. inner sleeve; 7. outer sleeve; 8. jet structure; 81. jet inlet; 82. jet outlet A; 83. jet outlet B; 9. pressure reducing flow channel; 91. main flow channel; 92. secondary flow channel; 10. connecting rod. DETAILED DESCRIPTION

[0041] 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.

[0042] 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.

[0043] Example 1

[0044] like Figure 1-9 As shown, a double-sleeve high-pressure differential regulating valve with an active jet structure includes a valve body 1, a valve cover 2, a valve stem 3, a valve core, an inner sleeve 6, an outer sleeve 7 and a jet structure 8;

[0045] The valve cover 2 is arranged on the upper part of the valve body 1, and the bottom end surface of the valve cover 2 is arranged in a ring shape and extends through the valve cavity to the top of the valve port, which is used to fix the inner sleeve 6 and the outer sleeve 7 at the bottom. A through hole is arranged at the top of the valve cover 2 for the axial movement of the valve core, and the valve cover 2; the valve cavity diameter is 80mm;

[0046] The valve core, inner sleeve 6 and outer sleeve 7 are coaxially arranged in the valve cavity inside the valve body 1 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 2, and the bottom ends of the inner sleeve 6 and the outer sleeve 7 are connected to the outside of the valve port; the outer diameter of the outer sleeve 7 is 110mm, the inner diameter is 90mm, the outer diameter of the inner sleeve 6 is 86mm, and the inner diameter is 70mm;

[0047] 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.

[0048] Specifically, each of the jet structures 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°.

[0049] 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 3 drives the valve core to move up and down to open and close the pressure relief channel 9, the valve port and the jet structure 8 at the same time.

[0050] A cylindrical cavity is formed between the outer wall of the valve cover 2 and the valve body 1 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 2 through a connecting rod 10 and is fixedly connected to the valve stem 3, the top end of the inner core 4 passes through the valve cover 2 and is fixedly connected to the valve stem 3, the inner core 4 and the outer core 5 are detachably connected to the valve stem 3, the connecting rod 10 can be set to four, and the corresponding connecting rod 10 passing holes on the valve cover 2 are set to four, and the connecting rod 10 cooperates with the passing holes to limit the movement range of the valve core itself;

[0051] The outer walls of the two sleeves are provided with a pressure reducing channel 9 for connecting the inlet and the valve port of the regulating valve, wherein the pressure reducing channel 9 on the inner sleeve 6 is an inner pressure reducing channel, and the pressure reducing channel 9 on the outer sleeve 7 is an outer pressure reducing channel, the inner pressure reducing channel and the outer pressure reducing channel are the same and the phase angle between the two is 3.75°;

[0052] Both the inner pressure reducing flow channel and the outer pressure reducing flow channel include a main flow channel 91 and three sections of secondary flow channels 92 connected in sequence from the inlet to the outlet of the main flow channel 91; wherein the inlet valve cavity of the first section of the secondary flow channel 92 is connected, the outlet is U-shaped and intersects with the main flow channel 91, and the other two sections of the secondary flow channels 92 are heart-shaped and intersect with the main flow channel 91; after two times of collision between the secondary flow channel 92 and the main flow channel 91, the pressure reducing effect is significantly improved;

[0053] To optimize the structure, the widths of the main channel 91 , the second-stage secondary channel 92 , and the third-stage secondary channel 92 are all d, and the width of the first-stage secondary channel 92 is 0.8d.

[0054] Both the inner pressure relief flow channel and the outer pressure relief flow channel are distributed in N layers along the axial direction of the sleeve, and the number of pressure relief flow channels 9 in each layer is multiple and distributed in a ring array along the outer wall of the sleeve:

[0055] The number of the 1st to 4th layers of the pressure relief channels 9 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 the pressure relief channels 9 is distributed according to the second curve;

[0056] The first curve is a quadratic curve. Where 1≤x≤4, y1 represents the flow rate of the 1st to 4th layer pressure relief channel 9;

[0057] The second curve is a first-order curve. Where 5≤x≤N, y2 represents the flow rate of the 5-Nth layer of the pressure relief channel 9;

[0058] The calculation formula for the number of the first-top pressure relief channels distributed from bottom to top along the axial direction is as follows:

[0059] z X =Z*(y X -y X-1 ) / N

[0060] Among them, z X is the number of pressure relief channels 9 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 9, 1≤X≤N, and N is the total number of layers.

[0061] In this embodiment, the total number of flow channels Z is 320, and the total number of layers N is 20. In this embodiment, the number of flow channels distributed in layers 1-4 is 47, 37, 27, and 17, respectively, and the number of flow channels distributed in layers 5-20 is 12.

[0062] 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.

[0063] The present invention optimizes the parameters by setting specific parameters of the pressure reducing channel 9 and the jet structure 8, making the processing more convenient.

[0064] Specific working principle: the valve stem 3 is used to move the valve core upward to a certain distance, the valve is opened, the pressure reducing flow channel 9 is connected, the fluid enters from the flow channel inlet, and then the fluid is collided twice with the main flow channel 91 through the two auxiliary flow channels 92, thereby significantly improving the pressure reducing effect of the valve;

[0065] 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;

[0066] 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;

[0067] 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.

[0068] 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 double-sleeve high-pressure differential regulating valve with an active jet structure, comprising a valve body, a valve cover, a valve stem and a valve core, characterized in that: An inner sleeve and an outer sleeve are coaxially arranged in the valve cavity inside the valve body, and a pressure reducing flow channel for connecting the regulating valve inlet and the valve port is opened on the outer walls of the two sleeves; A jet structure is provided between the gap between the two sleeves 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 pressure relief channels on the inner sleeve and the outer sleeve are both distributed in multiple layers along the axial direction, and each layer has multiple pressure relief channels distributed in an annular array along the outer wall of the sleeve; The flow rates of the 1st to 4th layers of the pressure relief flow channels distributed from bottom to top along the axial direction are distributed according to the first curve, and the flow rates of the 5th to Nth layers of the pressure relief flow channels are distributed according to the second curve; The first curve is a quadratic curve, y1=ax 2 +bx, where 1≤x≤4, y1 represents the flow rate of the 1st to 4th layer pressure relief flow channel; The second curve is a first-order curve, y2=cx+5, where 5≤x≤N, y2 represents the flow rate of the 5th-Nth 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: z X =Z*(y X -y X-1 ) / N 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.

2. A double-sleeve high-pressure differential regulating valve with an active jet structure according to claim 1, characterized in that: 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 ends of the inner sleeve and the outer sleeve cooperate with the bottom end surface of the valve cover, and the bottom ends of the inner sleeve and the outer sleeve are connected to the outside of the valve port.

3. The double-sleeve high-pressure differential regulating valve with an active jet structure according to claim 2, characterized in that: A cylindrical cavity is formed between the outer wall of the valve cover and the valve body in the valve cavity. The outer core is slidably arranged in the cylindrical cavity, and the top end of the outer core passes through the valve cover through a connecting rod and is fixedly connected to the valve stem. The top end of the inner core passes through the valve cover and is fixedly connected to the valve stem.

4. The double-sleeve high-pressure differential regulating valve with an active jet structure according to claim 1, characterized in that: The phase angle between the decompression channel on the inner sleeve and the decompression channel on the outer sleeve is 3.75°.

5. The double-sleeve high-pressure differential regulating valve with an active jet structure according to claim 1, characterized in that: The pressure reducing channel comprises a main channel and three sections of secondary channels connected in sequence from the inlet to the outlet of the main channel, wherein the inlet of the first section of the secondary channel is connected to the valve cavity, the outlet is U-shaped and intersects with the main channel, and the other two sections of the secondary channel are heart-shaped and intersect with the main channel.

6. The double-sleeve high-pressure differential regulating valve with an active jet structure according to claim 5, characterized in that: The width dimension relationship between the main channel and the secondary channel includes: the width of the main channel is b1, the width of the first section of the secondary channel is b2, the width of the second section of the secondary channel is c1, and the width of the third section of the secondary channel is d, wherein 7. The double-sleeve high-pressure differential regulating valve with an active jet structure according to claim 1, characterized in that: 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°.

8. The double-sleeve high-pressure differential regulating valve with an active jet structure according to claim 1, characterized in that: 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.

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