Low driving torque high pressure stop valve

Abstract

The application belongs to the technical field of valves, and particularly relates to a low-driving-torque high-pressure stop valve, which is provided with a primary valve core and a secondary valve core; when the stop valve is closed, a part of an opening and closing port on a flow passage is closed by the secondary valve core first, the flow of the flow passage is reduced, then the first flow-through hole of a secondary hollow valve clack is closed by the primary valve core, so that the closing of the flow passage is completed; since the flow passage is closed in a staged manner, the required thrust for driving the primary valve core and the secondary valve core is reduced, the difficulty of closing the valve is reduced, and the low-driving-torque high-pressure stop valve is particularly suitable for a high-pressure stop valve with large flow.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of valves, and particularly relates to a low-driving-torque high-pressure stop valve. BACKGROUND

[0002] The stop valve is a valve used for cutting off the flow of hydraulic oil or adjusting the flow of hydraulic oil in a hydraulic system, which is also called a gate valve and belongs to a forced sealing type valve. The sealing mode is to apply torque to the valve rod, and the valve rod applies pressure to the valve disc in the axial direction to make the valve disc sealing surface tightly fit the valve seat sealing surface, so as to prevent the medium from leaking along the gap between the sealing surfaces. When the stop valve is opened, the valve disc moves in the same direction as the medium flow, and the stop valve mainly overcomes the friction of the valve rod and the packing, and needs to overcome a smaller resistance generated by the medium flow, so a smaller force is required to drive the handle. However, when the stop valve is closed, the valve disc moves in the opposite direction of the medium flow, and the stop valve needs to overcome the friction of the valve rod and the packing, and also needs to overcome a larger resistance generated by the medium flow, so a larger driving force is required. Therefore, it is difficult to close the high-pressure stop valve.

[0003] A stop valve is recorded in a Chinese patent document with the patent number CN202221064050.2. The driving handle of the valve rod of the stop valve is designed to make the force application more efficient by changing the position of the force application. However, the handle structure is complex, and the handle needs to be assembled, which requires more processes, and the torque required to close the valve has not been reduced. SUMMARY

[0004] The application aims to provide a low-driving-torque high-pressure stop valve to solve the technical problem of large rotating torque and high labor intensity in the closing process of the high-pressure stop valve in the prior art.

[0005] To solve the above technical problems, the application adopts the following technical solutions:

[0006] A low-driving-torque high-pressure stop valve is provided, which comprises a valve body, an inlet and an outlet are arranged on the valve body, a flow channel communicating with the inlet and the outlet is arranged in the valve body, an opening and closing port is arranged on the flow channel, a primary valve core and a secondary valve core are arranged in the valve body, the primary valve core comprises a primary valve rod and a primary valve disc, the secondary valve core comprises a secondary valve rod and a hollow secondary valve disc, the primary valve disc is connected with the primary valve rod, the hollow secondary valve disc is connected with the secondary valve rod, and the secondary valve rod can drive the hollow secondary valve disc to close or open the opening and closing port; the hollow secondary valve disc is provided with a first flow-through hole and a second flow-through hole communicating with the flow channel, and the primary valve rod can drive the primary valve disc to close or open the first flow-through hole.

[0007] Preferably, the secondary valve rod is a hollow rod, the primary valve rod is arranged in the secondary valve rod, the primary valve rod and the secondary valve rod are in clearance fit, and a first sealing ring is arranged between the primary valve rod and the secondary valve rod.

[0008] Preferably, the valve body comprises a lower valve shell and an upper valve cover, the upper valve cover is provided with a valve rod hole, the secondary valve rod and the valve rod hole are in clearance fit, and a second sealing ring is arranged between the secondary valve rod and the valve rod hole.

[0009] Preferably, the primary valve rod and the secondary valve rod are in threaded connection, the secondary valve rod and the valve rod hole are in threaded connection, the top of the primary valve rod is provided with a first rotating handle, and the top of the secondary valve rod is provided with a second rotating handle.

[0010] Preferably, the primary valve disc is arranged in the secondary hollow valve disc, and the internal space of the secondary hollow valve disc allows the primary valve disc to move to open the first flow-through hole.

[0011] Preferably, the size of the first flow-through hole accounts for one half of the area of the switch opening.

[0012] Preferably, the inside of the secondary hollow valve disc located at the first flow-through hole is provided with a first tapered sealing surface, the primary valve disc is provided with a second tapered sealing surface matched with the first tapered surface, and the bottom of the secondary hollow valve disc is provided with a third tapered sealing surface matched with the switch opening.

[0013] Preferably, the bottom of the secondary valve rod is provided with an outer flange, and the secondary hollow valve disc is connected below the outer flange through a screw.

[0014] Preferably, the second flow-through hole is provided with a plurality of second flow-through holes arranged on the side surface of the secondary hollow valve disc.

[0015] Preferably, the switch opening is provided with a valve seat matched with the secondary hollow valve disc.

[0016] Compared with the prior art, the low driving torque high pressure stop valve has the following advantages: 1. When the low driving torque high pressure stop valve is closed, a part of the switch opening of the flow passage is closed by the secondary valve core first, the flow of the flow passage is reduced, then the first flow-through hole of the secondary hollow valve disc is closed by the primary valve core, and thus the closing of the flow passage is completed. Since the low driving torque high pressure stop valve is provided with the primary valve core and the secondary valve core, the flow passage is closed in stages, the thrust required for driving the primary valve core and the secondary valve core is reduced, the difficulty of closing the valve is reduced, and the low driving torque high pressure stop valve is particularly suitable for a large-flow high pressure stop valve. 2. The matching surfaces between the primary valve core and the secondary valve core and between the secondary valve core and the switch opening are conical, the matching is close, there is no gap, and there is no leakage. 3. The primary valve rod and the secondary valve rod are coaxially assembled in a sleeve, the influence between them is small, the stage movement can be realized, and the structure of the valve is compact, and the volume of the stop valve is reduced. 4. The force receiving areas of the valve discs of the primary valve core and the secondary valve core are each half of the oil passage area of the switch opening, the torque required for driving the valve cores is reduced by reducing the force receiving area of the valve core, and the driving force of the handle is saved. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:

[0018] Figure 1 It is a perspective structural schematic view of an embodiment of the low driving torque high pressure stop valve.

[0019] Figure 2 It is a perspective structural schematic view of an embodiment of the low driving torque high pressure stop valve.

[0020] Figure 3 It is a structural schematic view of the primary valve core in an embodiment of the low driving torque high pressure stop valve.

[0021] Figure 4 It is a structural schematic view of the secondary valve core in an embodiment of the low driving torque high pressure stop valve.

[0022] Figure 5 It is a sectional view of the secondary valve core in an embodiment of the low driving torque high pressure stop valve.

[0023] Figure 6 It is a front view of the secondary hollow valve disc in an embodiment of the low driving torque high pressure stop valve.

[0024] Figure 7 It is Figure 6 A-A sectional view.

[0025] Figure 8This is a front view of the second flow hole in the secondary hollow valve disc in an embodiment of the low driving torque and high pressure stop valve of the present invention.

[0026] Figure 9 yes Figure 8 BB cross-section diagram.

[0027] In the figure, the reference numerals are indicated as: lower valve housing 1, upper valve cover 11, screw 12, flow channel 13, switch port 131, first-level valve stem 2, first-level valve disc 21, second conical sealing surface 211, first external thread section 22, first rotating handle 23, first sealing ring 24, second-level valve stem 3, second hollow valve disc 31, first flow hole 311, second flow hole 312, first conical sealing surface 313, third conical sealing surface 314, outer flange 32, second external thread section 33, screw 34, internal thread section 35, second rotating handle 36, second sealing ring 37. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] In one embodiment, a low drive torque high pressure cut-off valve is provided, such as Figure 1 As shown, the low driving torque high pressure stop valve comprises a valve body, the valve body comprises a lower valve shell 1 and an upper valve cover 11, the lower valve shell 1 and the upper valve cover 11 are connected by four screws 12 arranged circumferentially, and the valve body is connected by four screws 12 arranged circumferentially. Figure 2 As shown, an inlet P and an outlet A are provided on the lower valve shell 1 of the valve body, and a flow channel 13 connecting the inlet P and the outlet A is provided in the lower valve shell 1. A switch port 131 is provided in the flow channel 13. When the switch port 131 is closed, the flow channel 13 is closed. When the switch port 131 is not closed, the flow channel 13 is connected.

[0030] like Figure 2 As shown, the low-drive-torque, high-pressure shut-off valve further includes a primary valve core and a secondary valve core disposed in the valve body, wherein the primary valve core includes a primary valve stem 2 and a primary valve flap 21, and the secondary valve core includes a secondary valve stem 3 and a secondary hollow valve flap 31. One end of each of the primary valve stem 2 and the secondary valve stem 3 is located outside the valve body, so that the primary valve stem 2 and the secondary valve stem 3 can be controlled from outside the valve body. The primary valve flap 21 is integrally disposed at the bottom of the primary valve stem 2, and the secondary hollow valve flap 31 is connected to the secondary valve stem 3. The secondary valve stem 3 can drive the secondary hollow valve flap 31 to move its position, thereby closing or opening the switch port 131; as shown in FIG. Figure 4 and Figure 5As shown, the second hollow valve disc 31 is provided with a first flow hole 311 and a second flow hole 312. The first flow hole 311 is located at the bottom of the second hollow valve disc 31, and the second flow hole 312 is located at the side of the second hollow valve disc 31. The first flow hole 311 is in communication with one side of the inlet P of the flow passage 13, and the second flow hole 312 is in communication with one side of the outlet A of the flow passage 13. The first flow hole 311 is sealed by the first valve disc 21. When the first flow hole 311 is sealed by the first valve disc 21, the entire flow passage 13 is sealed. When the first valve disc 21 is moved away from the first flow hole 311, the flow passage 13 is conducted through the first flow hole 311 and the second flow hole 312.

[0031] The low driving torque high pressure stop valve is used as follows: (1) stop valve closed: the valve body has enough space for the second hollow valve disc 31 to move position. The second hollow valve disc 31 is driven by the second valve rod 3 to make the second hollow valve disc 31 close the switch opening 131. At this time, the flow passage 13 is conducted through the first flow hole 311 and the second flow hole 312, and the flow in the flow passage 13 is reduced by a part. Then the first valve disc 21 is driven by the first valve rod 2 to move position, so that the first valve disc 21 seals the first flow hole 311 of the second hollow valve disc 31, so that the entire flow passage 13 is cut off; (2) stop valve opened: the first valve disc 21 is driven by the first valve rod 2 to move position, so that the first valve disc 21 is moved away from the first flow hole 311 of the second hollow valve disc 31, the first flow hole 311 is opened, so that the flow passage 13 is opened by a part; then the second hollow valve disc 31 is driven by the second valve rod 3, so that the second hollow valve disc 31 is moved away from the switch opening 131, and the switch opening 131 is opened. At this time, the entire flow passage 13 is conducted.

[0032] It can be seen that when the low driving torque high pressure stop valve is closed, the switch opening 131 of the flow passage 13 is first closed by the second valve core to reduce the flow of the flow passage 13, and then the first flow hole 311 of the second hollow valve disc 31 is closed by the first valve core, so as to complete the closing of the flow passage 13. Since the low driving torque high pressure stop valve is provided with a first valve core and a second valve core, the flow passage is closed by stages, the thrust required for driving the first valve core and the second valve core is reduced, the difficulty of closing the valve is reduced, and it is especially suitable for large flow high pressure stop valve.

[0033] Further, in one embodiment, as shown in the drawings, Figure 2 the upper valve cover 11 of the valve body is provided with a valve rod hole. The second valve rod 3 is gap-fitted with the valve rod hole, so that the second valve rod 3 can move up and down in the valve rod hole. A second sealing ring 37 is arranged between the second valve rod 3 and the valve rod hole. The outer wall of the second valve rod 3 is provided with a sealing ring groove, and the second sealing ring 37 is correspondingly arranged in the sealing ring groove.

[0034] Further, in one embodiment, as shown in the drawings,Figure 2 As shown in FIG. 1, the low driving torque high pressure stop valve has a two-stage valve rod structure, and the two-stage valve rod structure is composed of a first valve rod 2 and a second valve rod 3. As shown in FIG. 2, the second valve rod 3 is a hollow rod, and the first valve rod 2 is arranged in the second valve rod 3, and the outer wall of the first valve rod 2 is in clearance fit with the inner wall of the second valve rod 3, so that the first valve rod 2 can move up and down in the second valve rod 3. A first sealing ring 24 is arranged between the first valve rod 2 and the second valve rod 3. The outer wall of the first valve rod 2 is provided with a sealing ring groove, and the first sealing ring 24 is arranged in the sealing ring groove. By arranging the first valve rod 2 in the second valve rod 3, the structure of the entire stop valve is more compact, and the closing and opening of the stop valve is also more convenient. In other embodiments, the first valve rod and the second valve rod can also be arranged separately, and at this time, two valve rod holes need to be opened on the valve body, and this way can also realize the control of the first valve core and the second valve core.

[0035] Further, in an embodiment, as shown in FIG. 1, Figure 3 As shown in FIG. 2, the upper part of the first valve rod 2 of the low driving torque high pressure stop valve is provided with a first external thread segment 22, as shown in FIG. 3, Figure 4 As shown in FIG. 4, the inner upper part of the second valve rod 3 is provided with an internal thread segment 35 matched with the first external thread segment 22, so that the first valve rod 2 and the second valve rod 3 are connected through threads, and as shown in FIG. 5 and Figure 1 and Figure 2 As shown in FIG. 6, the top of the first valve rod 2 is provided with a first rotating handle 23, and the top end of the first valve rod 2 is screwed with a nut pressing on the first rotating handle 23, and the first rotating handle 23 can be twisted to rotate the first valve rod 2, so that the first valve rod 2 moves up and down in the second valve rod 3. As shown in FIG. 7, Figure 4 As shown in FIG. 8, the upper part of the second valve rod 3 is provided with a second external thread segment 33, and as shown in FIG. 9, Figure 2 As shown in FIG. 10, the valve rod hole of the upper valve cover 11 is correspondingly provided with an internal thread segment, so that the second valve rod 3 is connected with the valve rod hole through threads, and as shown in FIG. 11, Figure 1 As shown in FIG. 12, the top of the second valve rod 3 is provided with a second rotating handle 36, and the second rotating handle 36 can be twisted to rotate the second valve rod 3, so that the second valve rod 3 moves up and down in the valve rod hole.

[0036] Further, in an embodiment, as shown in FIG. 1, Figure 2 As shown in FIG. 1, the first valve disc 21 of the low driving torque high pressure stop valve is arranged in the second hollow valve disc 31, and the space height inside the second hollow valve disc 31 allows the first valve disc 21 to move up and down, so that the first valve disc 21 can move to open the first flow-through hole 311 at the bottom of the second hollow valve disc 31. By arranging the first valve disc 21 in the second hollow valve disc 31, the first valve core and the second valve core form a compact structure, so that the low driving torque high pressure stop valve has a more compact structure. In other embodiments, the first valve disc can also be arranged outside the second hollow valve disc, that is, the first valve disc is arranged in the flow passage.

[0037] Further, in an embodiment, as shown in FIG. 1,Figure 2 and Figure 5 As shown, the size of the first flow hole 311 at the bottom of the secondary hollow valve flap 31 of the low driving torque high-pressure shut-off valve accounts for half the area of ​​the switch port 131. In this way, the resistance to closing the secondary hollow valve flap 31 and the primary valve flap 21 is basically the same, so that the maximum operating force for closing the primary valve core and the secondary valve core can be minimized.

[0038] Furthermore, in one embodiment, Figure 2 As shown, the second-stage hollow valve disc 31 of the low driving torque high pressure stop valve is provided with a first conical sealing surface 313 on the inner side of the first flow hole 311. Figure 3 As shown, a second conical sealing surface 211 matching the first conical surface 313 is provided at the bottom of the first valve disc 21. When the first valve disc 21 moves downward, the second conical sealing surface 211 is tightly fitted with the first conical surface 313, and the first flow hole 311 in the second hollow valve disc 31 is closed. Figure 5 As shown, a third conical sealing surface 314 is provided at the bottom of the secondary hollow valve disc 31, matching the switch port 131. The third conical sealing surface 314 seals the switch port 131. The first conical sealing surface 313, the second conical sealing surface 211, and the third conical sealing surface 314 all have a 90-degree taper angle. In other embodiments, a valve seat matching the secondary hollow valve disc can be provided at the switch port, with a conical surface provided inside the valve seat to ensure a good seal.

[0039] Furthermore, in one embodiment, Figure 4 and Figure 5 As shown, the bottom of the secondary valve stem 3 of the low driving torque high-pressure shut-off valve is provided with an outer flange 32, which is an annular sleeve welded to the bottom of the secondary valve stem 3. The secondary hollow valve disc 31 is connected to the bottom of the outer flange 32 by screws 34. In this way, the secondary hollow valve disc 31 can be disassembled at the bottom of the secondary valve stem 3 so that the primary valve stem 2 and the primary valve disc 21 can be installed in the secondary valve core.

[0040] Furthermore, in one embodiment, Figure 4 and Figure 5 As shown, the low driving torque high pressure stop valve has four second flow holes 312, which are evenly arranged on the side of the secondary hollow valve disc 31. Each second flow hole 312 is connected to the flow channel 13. The provision of multiple second flow holes 312 allows the flow channel 13 to be smooth.

[0041] In one specific embodiment, the low driving torque high pressure stop valve works as follows: (1) when working, the hydraulic oil enters the valve from the inlet P, first positively twist the first rotating handle 23, drive the first valve disc 21 to rise through the thread cooperation of the outer thread of the first valve rod 2 and the inner thread of the second valve rod 3, the first valve disc 21 leaves the second hollow valve disc 31, the oil flows from the first flow-through hole 311 and the second flow-through hole 312 on the second hollow valve disc 31, flows out of the stop valve from the A port, and the pressure in the valve is released; after the first valve rod 2 rises to the limit position, positively twist the second rotating handle 36, drive the second hollow valve disc 31 to rise through the thread cooperation of the outer thread of the second valve rod 3 and the inner thread of the valve rod hole of the upper valve cover 11, the second hollow valve disc 31 leaves the switch port 131, and the stop valve is completely opened. (2) when the stop valve is closed, first fix the first rotating handle 23 to rise to the limit position to prevent the first valve rod 2 and the second valve rod 3 from being disturbed, then reversely twist the second rotating handle 36, make the second hollow valve disc 31 tightly press on the switch port 131 through thread cooperation, the second valve core first closes to block the sealing surface of one half of the switch port and overcome part of the resistance; after the second hollow valve disc 31 tightly presses on the switch port 131, reversely twist the first rotating handle 23 to make the first valve disc 21 tightly press on the first flow-through hole 311 at the lower part of the second hollow valve disc 31 through thread cooperation, and complete the throttling work of the stop valve.

[0042] In the whole working process of the stop valve, the design divides the original one-time opening and closing action of the valve disc into two steps, reduces the force area of the valve disc through the hierarchical design, reduces the resistance that needs to be overcome when each valve core is closed, reduces the torque required by the driving handle, and achieves the purpose of saving driving force.

[0043] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A low-driving-torque, high-pressure shut-off valve, comprising a valve body, the valve body being provided with an inlet and an outlet, the valve body being provided with a flow passage communicating the inlet and the outlet, the flow passage being provided with a switch port, characterized in that: The valve body further includes a primary valve core and a secondary valve core disposed in the valve body, wherein the primary valve core includes a primary valve stem and a primary valve disc, and the secondary valve core includes a secondary valve stem and a secondary hollow valve disc. The primary valve disc is connected to the primary valve stem, and the secondary hollow valve disc is connected to the secondary valve stem. The secondary valve stem can drive the secondary hollow valve disc to close or open the switch port. The secondary hollow valve disc is provided with a first flow hole and a second flow hole which are in communication with the flow channel, and the primary valve stem can drive the primary valve disc to close or open the first flow hole; The first flow hole is located at the bottom of the secondary hollow valve disc, and the second flow hole is located on the side of the secondary hollow valve disc. The first flow hole is connected to the inlet side of the flow channel, and the second flow hole is connected to the outlet side of the flow channel. The second flow hole is arranged on the side of the secondary hollow valve disc; A first conical sealing surface is provided on the inner side of the first flow hole in the secondary hollow valve disc, and a second conical sealing surface matching the first conical sealing surface is provided on the primary valve disc; a third conical sealing surface matching the switch port is provided at the bottom of the secondary hollow valve disc.

2. The low driving torque high pressure cut-off valve according to claim 1, characterized in that: The secondary valve stem is a hollow stem, the primary valve stem is arranged in the secondary valve stem, the primary valve stem and the secondary valve stem are clearance-matched, and a first sealing ring is provided between the primary valve stem and the secondary valve stem.

3. The low driving torque high pressure cut-off valve according to claim 2, characterized in that: The valve body includes a lower valve shell and an upper valve cover. A valve stem hole is provided in the upper valve cover. The secondary valve stem is clearance-matched with the valve stem hole. A second sealing ring is provided between the secondary valve stem and the valve stem hole.

4. The low driving torque high pressure cut-off valve according to claim 3, characterized in that: The primary valve stem is threadedly connected to the secondary valve stem, and the secondary valve stem is threadedly connected to the valve stem hole. A first rotating handle is provided on the top of the primary valve stem, and a second rotating handle is provided on the top of the secondary valve stem.

5. The low driving torque high pressure cut-off valve according to claim 1, characterized in that: The primary valve flap is disposed in the secondary hollow valve flap, and the internal space of the secondary hollow valve flap allows the primary valve flap to move to a position to open the first flow hole.

6. The low driving torque high pressure cut-off valve according to claim 1, characterized in that: The size of the first flow hole accounts for half of the area of ​​the switch port.

7. The low driving torque high pressure cut-off valve according to claim 1, characterized in that: An outer flange is provided at the bottom of the secondary valve stem, and the secondary hollow valve disc is connected to the bottom of the outer flange by screws.

8. The low driving torque high pressure cut-off valve according to claim 1, characterized in that: A valve seat matching the secondary hollow valve disc is provided at the switch port.

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