Anti-overloading multi-valve cage regulating valve

Abstract

The invention relates to the technical field of regulating valves, in particular to an anti-overload multi-valve cage regulating valve which comprises a valve shell, a valve seat, a pneumatic element, a valve rod, a valve element, a valve cage set, a regulating mechanism and a through hole. The valve seat is installed above the valve shell, the pneumatic element is located above the valve seat, the valve rod is installed at the output end of the pneumatic element, the valve element is installed below the valve rod, the valve cage set is installed on the outer side of the valve element and comprises a lifting cage body and a rotating cage body, and the adjusting mechanism is arranged on the lifting cage body and the rotating cage body. The state of the multi-stage valve cage is adjusted through the upward moving distance of the valve element, so that the initial pressure of water flow can be reduced in an annular flow mode when the water flow makes contact with the first-stage valve cage, and meanwhile the length of a liquid flow channel is in direct proportion to the upward moving distance of the valve element; the output pressure can be gradually reduced along with the increase of the initial pressure of the water flow, and the stability of the valve body is improved.

Description

Technical Field

[0001] The invention relates to the technical field of regulating valves, in particular to an overload-proof multi-valve cage regulating valve. Background Art

[0002] The anti-overload multi-cage control valve is a multi-stage control valve that combines the function of anti-overload protection to handle emergency situations. The multi-cage control valve consists of multiple cages and achieves precise control of fluid flow and pressure through multi-stage regulation.

[0003] In the process of high-temperature and high-pressure liquid transmission, multiple valve cages have independent flow channels and adjustment functions, and then reduce the pressure of the fluid in stages, so that the pressure of the fluid is gradually reduced, and the pressure can be accurately adjusted; however, when the valve is initially opened, the high-pressure liquid at the inlet directly rushes into the valve core and directly reaches the first-stage valve cage. At this time, the first-stage valve cage will be subjected to a large impact force, which will cause the first-stage valve cage to be damaged; in addition, during the normal flow of the fluid, the valve core is adjusted to increase the flow rate, and the high-pressure liquid with a sudden change in speed will impact the first-stage valve cage again. At this time, the drastic change in the fluid flow rate will cause the overall oscillation of the regulating valve, forming a "surge" phenomenon, which in turn affects the accuracy of flow control;

[0004] In order to solve the above problems, there are many solutions in the prior art, such as a multi-spray squirrel cage high-proportional pressure reducing valve and a method of using the same with patent number 202210189842.0, which utilizes the pressure reducing holes on the first pressure reducing disc and the second pressure reducing disc to dissipate energy of the fluid by collision, and sets a lifting and adjusting mechanism between the second pressure reducing disc and the valve body, so that the valve can adjust the distance between the first pressure reducing disc and the second pressure reducing disc according to the inlet pressure, adjust the pressure reducing ratio, and achieve stable outlet pressure; however, at the moment the valve is opened, the high-pressure liquid will still impact the fixed first-stage valve cage, causing the overall oscillation of the regulating valve, making it difficult to eliminate the surge phenomenon, thereby affecting the accuracy of the multi-valve cage regulating valve and causing instability at the water outlet.

[0005] Based on this, in order to solve the problem that when high-temperature and high-pressure liquid is transmitted, the impact force of the liquid on the valve cage is too large at the moment the valve is opened, causing the regulating valve to oscillate, thereby affecting the accuracy of the regulating valve in regulating the pressure, the present invention designs an anti-overload multi-valve cage regulating valve. Summary of the invention

[0006] The present invention provides an anti-overload multi-cage regulating valve. In order to solve the problem that when high-temperature and high-pressure liquid is transmitted, the impact force of the liquid on the valve cage is too large when the valve is opened, causing the regulating valve to oscillate, thereby affecting the accuracy of the regulating pressure of the regulating valve. The present invention uses the upward movement distance of the valve core to adjust the state of the multi-stage valve cage, so that when the water flow contacts the first-stage valve cage, the initial pressure of the water flow can be reduced in an annular flow manner, and at the same time, the flow path length of the liquid is proportional to the upward movement distance of the valve core, so that the output pressure can be gradually reduced as the initial pressure of the water flow increases, thereby improving the stability of the valve body.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] The present invention provides an anti-overload multi-valve cage regulating valve, which includes a valve housing, a valve seat, a pneumatic element, a valve stem, a valve core, a valve cage group, an adjusting mechanism and a through hole; the valve seat is installed above the valve housing, the pneumatic element is located above the valve seat, the valve stem is installed at the output end of the pneumatic element, the valve core is installed below the valve stem, the valve cage group is installed on the outside of the valve core, the valve cage group is divided into a lifting cage body and a rotating cage body, the adjusting mechanism is arranged on the lifting cage body and the rotating cage body, the through hole is opened on the surface of the valve cage, when the valve core moves upward under the action of the pneumatic element to open the valve housing, the lifting cage body moves upward under the drive of the adjusting mechanism to form a multi-stage loop, and the rotating cage body rotates in accordance with the direction of the water flow; the rotating cage body is used to change the flow path of the initial water flow, thereby converting the direct impact of the water flow and the rotating cage body into a circulating contact, thereby reducing the impact effect of the water flow on the rotating cage body.

[0009] The through hole can be set here to be initially located on the straight line where the inlet of the valve housing is located. After the rotating cage rotates, the position of the inlet can be changed, thereby forming a circulation; if the through hole on the rotating cage is rotated to a 90-degree direction from the initial direction, the liquid needs to have a 90-degree deviation when flowing from the through hole to the regulating hole, and finally flows out from the through hole above the rotating cage (still 90 degrees to the regulating hole), thereby changing the flow path of the fluid.

[0010] Preferably, the pneumatic element includes a pneumatic housing, a diaphragm, a compression spring and an air hole, the pneumatic housing is installed above the valve stem, the diaphragm is installed at the center of the pneumatic housing, the compression spring is installed below the diaphragm, the air hole is opened at the top of the valve stem and is connected with the pneumatic housing below the diaphragm, as the valve stem moves downward, the aperture of the air hole gradually decreases, and then the pressure below the diaphragm gradually increases, thereby offsetting part of the pressure of the new gas above the diaphragm, thereby reducing the gas delivery volume when the pressure reaches a certain level, and also providing protection when the pneumatic element fails and causes a sudden increase in gas.

[0011] Preferably, the adjusting mechanism comprises a fixed cage, a slide groove, a slider, a return spring, an internal thread groove, a retaining ring and an external thread, the fixed cage is installed on the valve housing, the slide groove is provided on the inner wall of the fixed cage, the slider is installed on the lifting cage, the slider is embedded in the slide groove, the internal thread groove is provided inside the rotating cage, the retaining ring is installed below the fixed cage, the external thread is provided on the outer surface of the retaining ring, the external thread is meshed with the internal thread groove, and the surface of the fixed cage is provided with adjusting holes, the adjusting holes are arranged in an array, and the adjusting holes are evenly spaced around the outer circumference of the fixed cage; thereby avoiding the high-pressure direct current water from hitting the valve cage when the water flow is too large, causing problems such as oscillation and "surge", thereby improving the adaptability and stability of the valve.

[0012] In order to ensure that the rotating cage does not move upward with the lifting cage, the upper and lower ends of the rotating cage are against the valve housing. At the same time, the number of turns of the internal thread groove should be limited to about 1, preferably 0.5, so the pitch needs to be longer. Although the rotation torque is large, under the circulation of the water flow, the rotation of the rotating cage can be formed.

[0013] Preferably, a seating groove is provided at the clamping ring, the seating groove opens downward, and a folding airbag is installed in the seating groove; the valve stem is hollow, and a conduit is installed under the valve stem, and the conduit is connected to the folding airbag; the return spring and the folding airbag can both buffer the descent of the valve core, and at the same time, the lifting cage will drive the rotating cage to rotate during the descent process, so that the liquid at the water outlet also flows in a circular manner.

[0014] Preferably, a limiting portion is provided on the inner surface of the valve housing, a limiting groove is provided on the surface of the rotating cage, a ball is installed at the contact point between the limiting portion and the limiting groove, and the limiting groove cooperates with the ball to reduce the wear of the rotating cage and the surface of the valve housing.

[0015] Preferably, the fixed cage body is divided into a bottom and a top, and cones are installed in the bottom and the top; the cone is made of elastic material, and the upper diameter of the cone is larger than the lower diameter of the cone, so that part of the water flow is blocked by the outer wall of the cone and flows toward the inner wall of the fixed cage body. It can deform when the water flow is too large, and can recover spontaneously when the adjustment is completed or the pressure is reduced after a period of time, thereby improving the water flow overload protection ability.

[0016] Preferably, a gap is left between the rotating cage and the fixed cage, and the fixed cage fits with the lifting cage, thereby expanding the area inside the valve shell, improving the water flow filling various areas inside the valve shell, and improving the stability of the valve body.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The present invention proposes an anti-overload multi-valve cage regulating valve, which is equipped with a lifting cage and a rotating cage. The lifting cage is used to move with the valve core to change the flow direction of water flow and extend the flow path of the water flow, thereby reducing the pressure of the water flow; the rotating cage is used to change the flow path of the initial water flow, thereby converting the direct impact of the water flow and the rotating cage into a circulating contact, thereby reducing the impact effect of the water flow on the rotating cage, thereby avoiding overload of the input water flow pressure, and thereby improving the stability of the valve body.

[0019] 2. The present invention proposes an anti-overload multi-valve cage regulating valve, which closes the valve body by inflating air into the pneumatic housing through the inflation port on the top of the pneumatic housing, and the gas accumulates above the diaphragm. When the gas reaches a certain pressure, it will drive the diaphragm to squeeze the compression spring, and then the compression spring moves downward, driving the valve stem to move downward, and at the same time, the gas below the diaphragm will flow to the inside of the valve stem through the air hole, and the air hole is an inverted triangle. As the valve stem moves downward, the aperture of the air hole gradually decreases, and then the pressure below the diaphragm gradually increases, thereby offsetting part of the pressure of the newly added gas above the diaphragm, and then when the pressure reaches a certain level, the gas delivery volume can be reduced. At the same time, it can also provide protection when the pneumatic component fails and causes a sudden increase in gas, thereby avoiding overload of gas input, and thereby improving the stability of the valve body.

[0020] 3. The present invention proposes an anti-overload multi-valve cage regulating valve. In the process of the lifting cage body moving upward, the retaining ring also moves upward, and the external thread on the surface of the retaining ring cooperates with the internal thread groove of the rotating cage body, thereby driving the rotating cage body to rotate. When the water flows, the rotating cage body as the first-level valve cage can transmit the direct current water inward in the form of a circulation, and then enter the rotating cage body and the fixed cage body through the through hole. Although the water flow passes through the through hole at this time, it still has the tendency and inertia of circulation, so that the water flow can continue to circulate upward and enter the lifting cage body and the rotating cage body (through the adjustment hole), and finally flow out from the through hole above the lifting cage body, thereby avoiding the high-pressure direct current water from hitting the valve cage when the water flow is too large, causing oscillation and "surge" problems, thereby improving the adaptability and stability of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation mode of the present invention or the technical solution in the prior art, the drawings required for use in the specific implementation mode or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are one implementation mode of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2It is a half-section schematic diagram of the valve seat and the valve housing of the present invention;

[0024] Figure 3 is a schematic diagram of a pneumatic component of the present invention;

[0025] Figure 4 is a half-section schematic diagram of the valve cage assembly of the present invention;

[0026] Figure 5 It is an exploded view of the valve cage assembly and the fixed cage body of the present invention;

[0027] Figure 6 is a schematic diagram of the folding airbag of the present invention;

[0028] Figure 7 yes Figure 6 The enlarged view of point A in the middle;

[0029] Figure 8 It is a schematic diagram of the limiting portion of the present invention;

[0030] Fig. 9 yes Figure 8 The enlarged view of point B in the middle;

[0031] Fig.10 It is a detail view of the cone of the present invention.

[0032] In the figure: 1. valve housing; 11. limiting part; 12. limiting groove; 13. ball; 2. valve seat; 3. pneumatic element; 31. pneumatic housing; 32. diaphragm; 33. compression spring; 34. air hole; 4. valve stem; 41. guide tube; 5. valve core; 6. valve cage group; 61. lifting cage; 611. adjusting hole; 62. rotating cage; 7. adjusting mechanism; 71. fixing cage; 711. bottom; 712. top; 72. slide groove; 73. slider; 74. reset spring; 75. internal thread groove; 76. retaining ring; 761. placement groove; 762. folding airbag; 77. external thread; 8. through hole; 9. cone. DETAILED DESCRIPTION

[0033] In order to better understand the above solution, the above technical solution is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] like Figure 1-2As shown, an anti-overload multi-valve cage regulating valve provided by the present invention comprises a valve housing 1, a valve seat 2, a pneumatic element 3, a valve stem 4, a valve core 5, a valve cage group 6, an adjusting mechanism 7 and a through hole 8; a water inlet pipe and a water outlet pipe sequentially pass through the valve housing 1, and the water inlet pipe is arranged lower than the water outlet pipe, so that the water flow can flow from the bottom to the top, and the pressure is reduced by flowing from a low potential to a high potential; the valve seat 2 is installed above the valve housing 1, and the valve seat 2 is used to connect the pneumatic element 3 and the valve housing 1, and also plays a role in supporting the valve stem 4; the pneumatic element 3 is located above the valve seat 2, and the valve stem 4 is installed at the output end of the pneumatic element 3, and the valve core 5 is installed at the valve stem 4 At the bottom, the valve core 5 is initially located in the valve housing 1, and can block the water inlet or outlet, thereby realizing the isolation of the valve from the water flow. The valve cage group 6 is installed on the outside of the valve core 5. The valve cage group 6 is divided into a lifting cage 61 and a rotating cage 62. The lifting cage 61 is used to move with the valve core 5 to change the flow direction of the water flow and extend the flow path of the water flow, thereby reducing the pressure of the water flow; the rotating cage 62 is used to change the flow path of the initial water flow, thereby converting the direct impact of the water flow and the rotating cage 62 into a circular flow contact, thereby reducing the impact effect of the water flow on the rotating cage 62, thereby improving the stability of the valve body;

[0035] The regulating mechanism 7 is arranged on the lifting cage 61 and the rotating cage 62, and the through hole 8 is opened on the surface of the valve cage. When the valve core 5 moves upward under the action of the pneumatic element 3 to open the valve shell 1, the lifting cage 61 moves upward under the drive of the regulating mechanism 7 to form a multi-stage loop, and the rotating cage 62 rotates in the direction of the water flow.

[0036] like Figure 3 As shown, the pneumatic element 3 includes a pneumatic housing 31, a diaphragm 32, a compression spring 33 and an air hole 34. The pneumatic housing 31 is installed above the valve stem 4, the diaphragm 32 is installed at the center of the pneumatic housing 31, and the compression spring 33 is installed below the diaphragm 32. The air hole 34 is opened at the top 712 of the valve stem 4 and is connected to the pneumatic housing 31 below the diaphragm 32. The pneumatic housing 31 is inflated through the inflation port 712 at the top of the pneumatic housing 31. The gas accumulates above the diaphragm 32. When the gas reaches a certain pressure, it will drive the diaphragm 32 to squeeze the compression spring 33. 3, and then the compression spring 33 moves downward, driving the valve stem 4 to move downward, and at the same time, the gas under the diaphragm 32 will flow into the valve stem 4 through the air hole 34, and the air hole 34 is an inverted triangle. As the valve stem 4 moves downward, the aperture of the air hole 34 gradually decreases, and then the pressure under the diaphragm 32 gradually increases, thereby offsetting part of the pressure of the newly added gas above the diaphragm 32, and then when the pressure reaches a certain level, the gas delivery volume can be reduced. At the same time, it can also provide protection when the pneumatic component 3 fails and causes a sudden increase in gas, thereby avoiding overload of gas input, and thereby improving the stability of the valve body.

[0037] like Figure 4-5 As shown, the adjustment mechanism 7 includes a fixed cage 71, a slide groove 72, a slider 73, a return spring 74, an internal thread groove 75, a retaining ring 76 and an external thread 77. The fixed cage 71 is installed on the valve housing 1, the slide groove 72 is opened on the inner wall of the fixed cage 71, the slider 73 is installed on the lifting cage 61, the slider 73 is embedded in the slide groove 72, the internal thread groove 75 is opened inside the rotating cage 62, the retaining ring 76 is installed below the fixed cage 71, the external thread 77 is opened on the outer surface of the retaining ring 76, the external thread 77 is meshed with the internal thread groove 75, and the surface of the fixed cage 71 is opened with adjustment holes 611, the adjustment holes 611 are arranged in an array, and the adjustment holes 611 are evenly spaced around the outer periphery of the fixed cage 71; a gap is left between the rotating cage 62 and the fixed cage 71, and the fixed cage 71 is fitted with the lifting cage 61.

[0038] When the pneumatic element 3 is evacuated, the pressure above the diaphragm 32 is reduced, causing the diaphragm 32 to move upward, driving the valve stem 4 to move upward, and then driving the valve core 5 to move upward. When the valve core 5 moves upward, the slider 73 in the slide groove 72 drives the lifting cage 61 to move upward. At this time, the adjustment hole 611 on the surface of the lifting cage 61 will also move upward, and the liquid will flow from the through hole 8 on the surface of the rotating cage 62 below to the center. When it flows between the rotating cage 62 and the fixed cage 71, a part of the liquid will flow upward along the surface of the fixed cage 71, and then pass through The regulating hole 611 on the surface of the lifting cage 61 flows between the lifting cage 61 and the rotating cage 62, thereby forming an annular flow, reducing the pressure on the water flow. The valve core 5 is used to cover the top 712 of the fixed cage 71, so that the liquid inside can form a diversion. Part of the water flow will flow outward layer by layer along the through hole 8 of the fixed cage 71, and the other part of the water flow will enter between the lifting cage 61 and the rotating cage 62 along the regulating hole 611 on the surface of the lifting cage 61, and then flow out from the through hole 8 on the other side of the rotating cage 62 in a circular flow manner and flow from the water outlet;

[0039] During the upward movement of the lifting cage 61, the retaining ring 76 also moves upward, and the external thread 77 on the surface of the retaining ring 76 cooperates with the internal thread groove 75 of the rotating cage 62, thereby driving the rotating cage 62 to rotate. When the water flows, the rotating cage 62, as the first-level valve cage, can transmit the direct current water inward in the form of a circulation, and then enter the space between the rotating cage 62 and the fixed cage 71 through the through hole 8. Although the water flow has passed through the through hole 8 at this time, it still has the tendency and inertia of circulation, so that the water flow can continue to circulate upward and enter between the lifting cage 61 and the rotating cage 62 (through the adjustment hole 611), and finally flow out from the through hole 8 above the rotating cage 62, thereby avoiding the high-pressure direct current water from hitting the valve cage when the water flow is too large, causing oscillation and "surge" problems, thereby improving the adaptability and stability of the valve body.

[0040] like Figure 6-7 As shown, the clamp ring 76 is provided with a placement groove 761, the placement groove 761 opens downward, and a folding airbag 762 is installed in the placement groove 761. The valve stem 4 is hollow, and a guide tube 41 is installed below the valve stem 4, and the guide tube 41 is connected to the folding airbag 762.

[0041] When the water flow is cut off, the pneumatic element 3 drives the valve stem 4 to move downward, and the valve core 5 moves downward. When the moving speed is too fast, the water flow cut-off speed is too fast, which will cause the impact force of the liquid backflow to be too large, thereby causing the load-bearing overload at the water outlet of the valve body. At the same time, the downward impact force of the valve core 5 will affect the valve housing 1. Therefore, when the air pressure above the diaphragm 32 suddenly increases to close the valve, the valve stem 4 moves downward abruptly, and the gas below the diaphragm 32 will flow into the valve stem 4 along the air hole 34, and be injected into the folded airbag 762 through the conduit 41, thereby unfolding the folded airbag 762, and the folded airbag 762 The valve housing 1 is used for buffering, and the folded airbag 762 is located in the mounting groove 761 of the retaining ring 76, and the retaining ring 76 is located on the lifting cage 61, and the lifting cage 61 is connected to the valve core 5 through the slider 73 and the return spring 74, so that the return spring 74 and the folded airbag 762 can buffer the descent of the valve core 5. At the same time, the lifting cage 61 will drive the rotating cage 62 to rotate during the descent process, so that the liquid at the water outlet will also circulate in a circular manner, and then after the stage, the liquid at the water outlet will flow back along the trend of the circulation, thereby reducing the damage of the water flow to the valve body.

[0042] like Figure 8-9 As shown, a limiting portion 11 is provided on the inner surface of the valve housing 1, and a limiting groove 12 is provided on the surface of the rotating cage 62. A ball 13 is installed at the contact between the limiting portion 11 and the limiting groove 12. The limiting portion 11 blocks the water flow to prevent the water flow from reaching the top directly without passing through the rotating cage 62. At the same time, the limiting groove 12 cooperates with the ball 13 to reduce the wear on the surface of the rotating cage 62 and the valve housing 1.

[0043] like Fig.10 As shown, the fixed cage body 71 is divided into a bottom 711 and a top 712, and a cone 9 is installed in the bottom 711 and the top 712; the cone 9 is made of elastic material, and the upper diameter of the cone 9 is larger than the lower diameter of the cone 9. The cone 9 is used to provide a buffer when the valve core 5 descends, and at the same time, when the high-pressure water flow enters, it can form a reflection, so that part of the water flow is hindered by the outer wall of the cone 9 and flows to the inner wall of the fixed cage body 71. The elastic material is preferably rubber, so it can be deformed when the water flow is too large, and it can recover spontaneously when the adjustment is completed or the pressure is reduced after a period of time, thereby improving the water flow overload protection ability and improving the stability of the valve.

[0044] When high-pressure liquid needs to flow, the gas of the pneumatic element 3 is extracted to make the valve stem 4 and the valve core 5 move away from the valve housing 1, and the valve stem 4 slides in the valve seat 2, thereby driving the valve core 5 to move upward. At this time, the high-pressure liquid flows through the valve cage group 6. The regulating mechanism 7 is synchronously acted upon by the valve core 5 to drive the lifting cage 61 to rise, and the lifting cage 61 drives the rotating cage 62 to rotate, thereby changing the water flow from direct flow to circulating flow through the valve body, thereby avoiding the problem that the overload of high-pressure liquid has an excessive impact on the valve body, causing damage to the valve body;

[0045] Specifically, the gas in the pneumatic housing 31 is extracted, and the pressure above the diaphragm 32 is reduced, so that the center of the diaphragm 32 moves upward, driving the valve stem 4 to move upward, and the valve core 5 to move upward; when the valve core 5 moves upward, it will drive the lifting cage 61 to move upward through the slider 73 in the slide groove 72, and the liquid will flow from the through hole 8 on the surface of the rotating cage 62 below to the center. When it flows between the rotating cage 62 and the fixed cage 71, a part of the liquid will flow upward along the surface of the fixed cage 71, and then flow between the lifting cage 61 and the rotating cage 62 through the adjustment hole 611 on the surface of the lifting cage 61, thereby forming an annular flow, and another part of the water flow will flow outward layer by layer along the through hole 8 of the fixed cage 71;

[0046] In the process of the lifting cage 61 moving upward, the clamping ring 76 also moves upward, and the external thread 77 on the surface of the clamping ring 76 cooperates with the internal thread groove 75 of the rotating cage 62, thereby driving the rotating cage 62 to rotate. When the water flows, the rotating cage 62, as the first-level valve cage, can transmit the direct current water inward in the form of a circulation, and then enter the rotating cage 62 and the fixed cage 71 through the through hole 8. Although the water flow passes through the through hole 8 at this time, it still has the tendency and inertia of circulation, and then the water flow can continue to circulate upward through the regulating hole 611 to enter between the lifting cage 61 and the rotating cage 62, and finally flow out from the through hole 8 above the rotating cage 62;

[0047] When the water flow is cut off, air is inflated into the pneumatic housing 31, and the diaphragm 32 moves downward, driving the valve stem 4 and the valve core 5 to move downward; however, when the valve core 5 moves too fast (i.e., inflation overload), the water flow is cut off too fast, which will cause the impact force of the liquid reflux to be too large, thereby causing the load-bearing overload at the valve outlet. At the same time, the downward impact force of the valve core 5 will affect the valve housing 1. Therefore, when the air pressure above the diaphragm 32 suddenly increases to close the valve, the valve stem 4 moves downward abruptly, and the gas below the diaphragm 32 will flow into the valve stem 4 along the air hole 34, and be injected into the folding airbag 762 through the conduit 41, thereby unfolding the folding airbag. The bag 762 and the folded air bag 762 cushion the valve housing 1. At the same time, the folded air bag 762 is located in the mounting groove 761 of the retaining ring 76, and the retaining ring 76 is located on the lifting cage 61. The lifting cage 61 is connected to the valve core 5 through the slider 73 and the return spring 74, so that the return spring 74 and the folded air bag 762 can both cushion the descent of the valve core 5. At the same time, the lifting cage 61 will drive the rotating cage 62 to rotate during the descent process, so that the liquid at the water outlet will also circulate in a circular manner, and then after the water flow is cut off, the liquid at the water outlet will flow back along the trend of the circulation, thereby improving the stability of the valve body.

[0048] The basic principles and beneficial effects of the present invention are shown and described above. At the same time, the present invention is not limited to the above embodiments. Without departing from the effects and scope of the present invention, the present invention may have various changes and improvements. These changes and improvements all fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An anti-overload multi-cage regulating valve, characterized in that: The valve comprises a valve housing (1), a valve seat (2), a pneumatic element (3), a valve stem (4), a valve core (5), a valve cage group (6), an adjusting mechanism (7) and a through hole (8); the valve seat (2) is mounted above the valve housing (1), the pneumatic element (3) is located above the valve seat (2), the valve stem (4) is mounted at the output end of the pneumatic element (3), the valve core (5) is mounted below the valve stem (4), the valve cage group (6) is mounted outside the valve core (5), the valve cage group (6) is divided into a lifting cage body (61) and a rotating cage body (62), the adjusting mechanism (7) is arranged on the lifting cage body (61) and the rotating cage body (62), the through hole (8) is opened on the surface of the valve cage group (6), when the valve core (5) moves upward under the action of the pneumatic element (3) to open the valve housing (1), the lifting cage body (61) moves upward under the drive of the adjusting mechanism (7) to form a curved loop, and the rotating cage body (62) rotates in accordance with the direction of water flow.

2. The anti-overload multi-cage regulating valve according to claim 1, characterized in that: The pneumatic element (3) comprises a pneumatic housing (31), a diaphragm (32), a compression spring (33) and an air hole (34); the pneumatic housing (31) is mounted above the valve stem (4); the diaphragm (32) is mounted at the center of the pneumatic housing (31); the compression spring (33) is mounted below the diaphragm (32); and the air hole (34) is opened above the valve stem (4) and is connected to the pneumatic housing (31) below the diaphragm (32).

3. The anti-overload multi-cage regulating valve according to claim 1, characterized in that: The regulating mechanism (7) comprises a fixed cage (71), a slide groove (72), a slider (73), a return spring (74), an internal thread groove (75), a retaining ring (76) and an external thread (77); the fixed cage (71) is mounted on the valve housing (1); the slide groove (72) is formed on the inner wall of the fixed cage (71); the slider (73) is mounted on the lifting cage (61); the slider (73) is embedded in the slide groove (72); the internal thread groove (75) is formed inside the rotating cage (62); the retaining ring (76) is mounted below the lifting cage (61); the external thread (77) is formed on the outer surface of the retaining ring (76); and the external thread (77) is meshed with the internal thread groove (75).

4. The anti-overload multi-cage regulating valve according to claim 3, characterized in that: The surface of the lifting cage (61) is provided with adjustment holes (611), the adjustment holes (611) are arranged in an array, and the adjustment holes (611) are evenly spaced around the outer circumference of the lifting cage (61).

5. The anti-overload multi-cage regulating valve according to claim 3, characterized in that: The clamping ring (76) is provided with a placement groove (761), the placement groove (761) opens downward, and a folding airbag (762) is installed in the placement groove (761).

6. The anti-overload multi-cage regulating valve according to claim 5, characterized in that: The valve stem (4) is hollow, and a catheter (41) is installed below the valve stem (4), and the catheter (41) is connected to the folding airbag (762).

7. The anti-overload multi-cage regulating valve according to claim 1, characterized in that: The inner surface of the valve housing (1) is provided with a limiting portion (11), the surface of the rotating cage (62) is provided with a limiting groove (12), and a ball (13) is installed at the contact point between the limiting portion (11) and the limiting groove (12).

8. The anti-overload multi-cage regulating valve according to claim 3, characterized in that: The fixed cage body (71) is divided into a bottom portion (711) and a top portion (712), and a cone (9) is installed at the bottom portion (711).

9. The anti-overload multi-cage regulating valve according to claim 8, characterized in that: The cone cylinder (9) is made of elastic material, and the upper diameter of the cone cylinder (9) is larger than the lower diameter of the cone cylinder (9).

10. The anti-overload multi-cage regulating valve according to claim 3, characterized in that: A gap is left between the rotating cage (62) and the lifting cage (61), and the fixed cage (71) is in close contact with the lifting cage (61).

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