A high pressure resistant needle valve

Abstract

The present invention provides a high-pressure resistant needle valve, which belongs to the technical field of high-pressure valves. The high-pressure resistant needle valve includes: a valve body, which has an air inlet and an air outlet at both ends of the valve body; a valve core, which is arranged inside the valve body and slidably connected to the valve body, and the valve core has a gas flow channel, and the gas flow channel at least includes a first vent hole arranged on the side wall of the valve core; a sealing ring, which is sleeved on the valve core; a valve stem, which is rotatably connected to the valve body; a block, which is arranged inside the valve body and threadedly connected to the bottom of the valve stem, and the side wall of the block and one end of the valve core are inclined sliding fit, and the block is used to drive the valve core to slide along the axial direction of the valve body. The block is controlled to rise or fall by rotating the valve stem, so that the speed of change of the air pressure difference inside the high-pressure resistant needle valve is reduced, and the sealing ring is prevented from being offset; in addition, due to the limiting effect of the linear limiting mechanism on the block, the block has a straightening effect on the valve stem during the up and down movement, and the center of the valve stem and the valve body is prevented from deviating.

Description

Technical Field

[0001] The invention relates to the technical field of high-pressure valves, and in particular to a high-pressure resistant needle valve. Background Art

[0002] The needle valve is an important part of the pipeline system. It is a valve that can achieve precise adjustment and control. Under the action of high pressure, the existing needle valve has a deviation between the center of the valve stem and the valve body, which causes eccentric wear of the valve stem, damages the internal structure of the valve body, and causes the valve stem and valve core to close loosely, causing fluid leakage; at the same time, the existing high-pressure needle valve has a large position deviation due to the rapid change of air pressure difference during the closing process, which affects the sealing effect.

[0003] The information disclosed in the background technology section of the present invention is only intended to deepen the understanding of the general background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0004] Based on this, it is necessary to provide a high-pressure resistant needle valve to address the problems existing in the current needle valve, so as to solve the problems of deviation between the valve stem and the valve body center and offset of the sealing ring in the existing needle valve.

[0005] The above purpose is achieved through the following technical solutions:

[0006] A high pressure resistant needle valve, comprising:

[0007] A valve body, wherein the valve body is a hollow structure, and has an air inlet and an air outlet at both ends of the valve body;

[0008] A valve core, the valve core is arranged inside the valve body and is slidably connected to the valve body so that the valve core can slide axially along the valve body; the valve core has a gas flow channel, the gas flow channel connects the two ends of the valve core, and the gas flow channel at least includes a first vent hole arranged on the side wall of the valve core;

[0009] A sealing ring, which is sleeved on the valve core and is used to seal the first vent hole;

[0010] A valve stem, a part of the structure of the valve stem is arranged inside the valve body, the axis of the valve stem intersects with the axis of the valve body, and the valve stem is rotatably connected to the valve body;

[0011] A blocking block, the blocking block is arranged inside the valve body and is threadedly connected to the bottom of the valve stem, the side wall of the blocking block is in inclined sliding cooperation with one end of the valve core, and the blocking block is used to drive the valve core to slide axially along the valve body;

[0012] A linear limiting mechanism is arranged at the bottom of the blocking block and connected to the valve body, and is used to enable the blocking block to move axially along the valve stem.

[0013] In one embodiment, the blocking block is of a quadrangular pyramid structure, the valve core includes a needle rod, the needle rod is slidably connected to the valve body, the end of the needle rod close to the blocking block is a sloped structure, and the sloped structure slides with the blocking block; a second air hole is provided in the middle of the needle rod, one end of the second air hole intersects with the sloped structure, and one end of the second air hole is connected to the first air hole, and the area of ​​the blocking block close to the valve core is larger than the cross-sectional area of ​​the second air hole at the sloped structure.

[0014] In one embodiment, the block has an internal threaded hole in the middle, the valve stem has a threaded section at the bottom, the threaded section is threadedly connected to the internal threaded hole, and the valve core has a clearance groove at one end close to the block, and the clearance groove is used to make way for the threaded section when the valve core moves toward the block.

[0015] In one embodiment, the linear limiting mechanism includes at least two telescopic rods, the two telescopic rods are located on both sides of the blocking block, the telescopic rod is a multi-section structure that can slide along its axis, the bottom of the telescopic rod is fixedly connected to the valve body, and the top of the telescopic rod is fixedly connected to the blocking block.

[0016] In one of the embodiments, the valve core also includes a valve plate, which is fixedly connected to the end of the needle rod away from the blocking block, and the valve plate is slidably connected to the inner wall of the valve body; the gas flow channel also includes a plurality of side holes and the second air vent arranged on the valve plate.

[0017] In one of the embodiments, the valve body has a sliding sleeve structure inside, the sliding sleeve structure is slidably connected to the needle rod, and the sealing ring abuts against the end surface of the sliding sleeve structure close to the air inlet.

[0018] In one of the embodiments, an elastic member is provided on the needle rod, and the elastic member is used to provide a thrust for the needle rod to approach the blocking block.

[0019] In one embodiment, the elastic member is a spring, the spring is sleeved on the needle rod, two ends of the spring are respectively connected to the needle rod and the sliding sleeve structure, and the spring has elastic force.

[0020] In one of the embodiments, the valve stem further has a force-applying section and a rotating section, and the force-applying section, the rotating section and the threaded section are coaxially arranged; a limiting sleeve is arranged on the top of the valve body, and the rotating section is arranged in the limiting sleeve and is rotatably connected to the limiting sleeve; the force-applying section is arranged above the limiting sleeve.

[0021] In one embodiment, two first ventilation holes are provided, and the two first ventilation holes are symmetrically arranged.

[0022] The beneficial effects of the present invention are:

[0023] During the closing or opening process of the high-pressure resistant needle valve in the embodiment of the present invention, the valve stem is driven to rotate manually or mechanically to control the block to rise or fall, and the gas flow channel and the first air vent in the gas flow channel are slowly blocked or connected, so that the speed of change of the internal air pressure difference of the high-pressure resistant needle valve is reduced, and the air pressure shock on the sealing ring is reduced, thereby preventing the sealing ring from shifting during the closing or opening of the high-pressure resistant needle valve; in addition, due to the limiting effect of the linear limiting mechanism on the block, the block has good centering properties during movement, and the block has a straightening effect on the valve stem during the up and down movement, thereby preventing the valve stem from deviating from the center of the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of a high pressure resistant needle valve according to an embodiment of the present invention;

[0025] Figure 2 A front view of a high pressure resistant needle valve according to an embodiment of the present invention;

[0026] Figure 3 For the present invention Figure 2 Middle AA section view;

[0027] Figure 4 A top view of a high pressure resistant needle valve according to an embodiment of the present invention;

[0028] Figure 5 For the present invention Figure 4 Middle BB section view;

[0029] Figure 6 A schematic diagram of the structure of a valve core according to an embodiment of the present invention;

[0030] Figure 7 Schematic diagram of the structure of a valve stem according to an embodiment of the present invention.

[0031] in:

[0032] 100, valve body; 101, air inlet; 102, air outlet; 103, limit sleeve; 200, valve stem; 201, force-applying section; 202, rotating section; 203, threaded section; 300, valve core; 301, needle rod; 302, valve plate; 303, side hole; 304, first air vent; 305, second air vent; 306, clearance groove; 400, blocking block; 500, telescopic rod; 600, sealing ring; 700, elastic member. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is 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 to the present invention.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] In some embodiments, reference Figure 1 and Figure 5 The high pressure resistant needle valve comprises a valve body 100, a valve core 300, a sealing ring 600, a valve stem 200, a blocking block 400 and a linear limiting mechanism and other structures.

[0037] The valve body 100 is a hollow structure, with an air inlet 101 and an air outlet 102 at both ends of the valve body 100 ; specifically, the valve body 100 is a through-length structure, and gas enters the valve body 100 from the air inlet 101 and flows out of the valve body 100 from the air outlet 102 .

[0038] The valve core 300 is disposed inside the valve body 100 and is slidably connected to the valve body 100, so that the valve core 300 can slide axially along the valve body 100; the valve core 300 has a gas flow channel, the gas flow channel connects the two ends of the valve core 300, and the gas flow channel at least includes a first vent hole 304 disposed on the side wall of the valve core 300. The gas flows through the gas inlet 101, the first vent hole 304 in the gas flow channel, and the gas outlet 102 in sequence, and the opening and closing of the first vent hole 304 are controlled by controlling the sliding of the valve core 300.

[0039] The sealing ring 600 is sleeved on the valve core 300 to block the first vent hole 304. When the valve core 300 moves to the left, the sealing ring 600 blocks the first vent hole 304, and the high-pressure needle valve is in a closed state; when the valve core 300 moves to the right, the sealing ring 600 is separated from the first vent hole 304, and the high-pressure needle valve is in an open state.

[0040] Part of the structure of the valve stem 200 is arranged inside the valve body 100, the axis of the valve stem 200 intersects with the axis of the valve body 100, the two can be arranged vertically, and the valve stem 200 and the valve body 100 are rotatably connected.

[0041] The block 400 is arranged inside the valve body 100 and is threadedly connected to the bottom of the valve stem 200. The side wall of the block 400 and one end of the valve core 300 are in inclined sliding cooperation. The block 400 is used to drive the valve core 300 to slide axially along the valve body 100. The rotation of the valve stem 200 can drive the block 400 to rise or fall. When the block 400 rises, there is a movable space on the left side of the valve core 300, and the high-pressure gas pushes the valve core 300 to move to the left, and always keeps the left end face of the valve core 300 in contact with the block 400; when the block 400 falls, the block 400 pushes the valve core 300 to move to the right through the inclined structure on its left side.

[0042] The linear limiting mechanism is arranged at the bottom of the block 400 and connected to the valve body 100, and is used to enable the block 400 to move axially along the valve stem 200. Since the block 400 and the valve stem 200 are threadedly matched, during the rotation of the valve stem 200, the linear limiting mechanism can keep the block 400 in linear motion.

[0043] Specifically in the above embodiment, in the process of closing or opening the high-pressure needle valve, the valve stem 200 is driven to rotate manually or mechanically, the block 400 is controlled to rise or fall, and the gas flow channel and the first vent hole 304 in the gas flow channel are slowly blocked or connected, so that the speed of change of the internal pressure difference of the high-pressure needle valve is reduced, the pressure shock on the sealing ring 600 is reduced, and the sealing ring 600 is prevented from being offset in the process of closing or opening the high-pressure needle valve. In addition, due to the limiting effect of the linear limiting mechanism on the block 400, the block 400 itself has good centering during the movement process, and the block 400 has a straightening effect on the valve stem 200 during the up and down movement, preventing the valve stem 200 from deviating from the center of the valve body 100.

[0044] In some embodiments, reference Figure 5 The block 400 is a four-sided pyramid structure, and the side of the block 400 is inclined outward from bottom to top. The valve core 300 includes a needle rod 301, and the needle rod 301 is slidably connected to the valve body 100. The end of the needle rod 301 close to the block 400 is a slope structure, and the slope structure is slidably matched with the block 400. During assembly, the four sides of the block 400 can be matched with the needle rod 301. The middle part of the needle rod 301 has a second vent 305, one end of the second vent 305 intersects with the slope structure, and one end of the second vent 305 is connected to the first vent 304. The area of ​​the block 400 close to the valve core 300 is larger than the cross-sectional area of ​​the second vent 305 at the slope structure.

[0045] In the above embodiment, before the sealing ring 600 blocks the first vent hole 304, the block 400 partially overlaps with the second vent hole 305, so that the flow area in the gas flow channel is reduced, thereby reducing the air pressure difference at the sealing ring 600, thereby reducing the gas pressure to which the sealing ring 600 is subjected when blocking the first vent hole 304, thereby preventing the sealing ring 600 from shifting in position.

[0046] In some embodiments, the block 400 has an internal threaded hole in the middle, the valve stem 200 has a threaded section 203 at the bottom, the threaded section 203 is threadedly connected to the internal threaded hole, and the valve core 300 has a clearance groove 306 at one end close to the block 400, and the clearance groove 306 is used to make way for the threaded section 203 during the movement of the valve core 300 to the block 400. It should be noted that the clearance groove 306 can also be used for the clearance of the linear limit mechanism. Due to the use of threaded matching, the rotation of the valve stem 200 can be converted into the linear motion of the block 400, and the straightening effect of the block 400 prevents the displacement of the valve stem 200.

[0047] In some embodiments, reference Figure 2 and 3The linear limiting mechanism includes at least two telescopic rods 500, which are located on both sides of the block 400. The telescopic rods 500 are multi-section structures that can slide along their axes. The bottom of the telescopic rod 500 is fixedly connected to the valve body 100, and the top of the telescopic rod 500 is fixedly connected to the block 400. The bottom of the telescopic rod 500 is a fixed structure to prevent the torque of the block 400 from causing the telescopic rod 500 to deviate. The two telescopic rods 500 are arranged in parallel to ensure that the block 400 can move linearly.

[0048] In some embodiments, reference Figure 6 The valve core 300 also includes a valve plate 302, which is fixedly connected to the end of the needle rod 301 away from the block 400, and the valve plate 302 is slidably connected to the inner wall of the valve body 100. The valve plate 302 can be selected to have a circular structure to better fit the valve body 100. The valve plate 302 bears the thrust of the high-pressure gas, which can make the valve core 300 move to the left. The gas flow channel also includes a plurality of side holes 303 and a second vent hole 305 arranged on the valve plate 302, and the plurality of side holes 303 are arranged at equal intervals along the circumference of the valve plate 302. The gas flows through the side hole 303, the first vent hole 304 and the second vent hole 305 in sequence. The side hole 303 and the second vent hole 305 are arranged along the axial direction of the valve core 300, and the first vent hole 304 is arranged along the radial direction of the valve core 300, so that the first vent hole 304 is easier to block.

[0049] In some embodiments, reference Figure 5 The valve body 100 has a sleeve structure inside, which is slidably connected to the needle rod 301, and the sealing ring 600 abuts against the end surface of the sleeve structure close to the air inlet 101. The sleeve structure reduces the diameter inside the valve body 100, which facilitates the assembly and sliding of the needle rod 301. The sleeve structure can also prevent the sealing ring 600 from moving leftward, and plays a certain degree of fixing and limiting role on the sealing ring 600.

[0050] In some embodiments, an elastic member 700 is provided on the needle rod 301, and the elastic member 700 is used to provide a thrust for the needle rod 301 to approach the block 400. The thrust for the needle rod 301 to move toward the block 400 can be provided by high-pressure gas. When the pressure of the high-pressure gas is insufficient, the elastic member 700 provides a thrust for the needle rod 301 to move, so that the left side of the needle rod 301 can always fit the block 400, thereby enhancing the sealing performance.

[0051] In some embodiments, the elastic member 700 is a spring, which is sleeved on the needle rod 301. The two ends of the spring are respectively connected to the needle rod 301 and the sliding sleeve structure. The spring has elastic force, so that the left side of the needle rod 301 is always in contact with the block 400, thereby enhancing the sealing performance.

[0052] In some embodiments, reference Figure 7The valve stem 200 also has a force-applying section 201 and a rotating section 202. The force-applying section 201, the rotating section 202 and the threaded section 203 are coaxially arranged. The force-applying section 201, the rotating section 202 and the threaded section 203 are an integrated structure and their diameters gradually decrease. A limiting sleeve 103 is arranged on the top of the valve body 100. The rotating section 202 is arranged in the limiting sleeve 103 and is rotatably connected to the limiting sleeve 103. The limiting sleeve 103 plays a limiting role to prevent the valve stem 200 from deflecting. Figure 4 The force-applying section 201 is disposed above the limiting sleeve 103 , and the force-applying section 201 may be a hexagonal or other polygonal structure, so as to facilitate the use of a tool to rotate the force-applying section 201 .

[0053] In some embodiments, two first ventilation holes 304 are provided, and the two first ventilation holes 304 are symmetrically arranged. The airflow direction changes at the first ventilation holes 304, and the airflow will generate a force on the needle rod 301. The two symmetrically arranged first ventilation holes 304 can make the needle rod 301 evenly stressed and prevent the needle rod 301 from getting stuck.

[0054] The working process of the high pressure needle valve in the above embodiment is as follows: Figure 5 , the high-pressure needle valve is in the open state, and the gas flows through the air inlet 101, the side hole 303, the first air hole 304, the second air hole 305 and the air outlet 102 in sequence. The valve stem 200 is driven to rotate manually or mechanically to control the block 400 to rise. At the same time, the needle rod 301 moves leftward under the action of air pressure or spring, and the block 400 slowly blocks the second air hole 305, so that the flow area of ​​the second air hole 305 is reduced, and the air pressure difference at the sealing ring 600 is reduced, thereby reducing the gas pressure received by the sealing ring 600 when blocking the first air hole 304, and preventing the position of the sealing ring 600 from shifting; due to the limiting effect of the telescopic rod 500 on the block 400, the block 400 itself has good centering during the movement process, and the block 400 has a straightening effect on the valve stem 200 during the up and down movement process, preventing the valve stem 200 from deviating from the center of the valve body 100.

[0055] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-described 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 a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A high pressure resistant needle valve, characterized in that: include: A valve body (100), the valve body (100) being a hollow structure, and having an air inlet (101) and an air outlet (102) at two ends of the valve body (100); A valve core (300), the valve core (300) being arranged inside the valve body (100) and being slidably connected to the valve body (100), so that the valve core (300) can slide axially along the valve body (100); the valve core (300) having a gas flow channel, the gas flow channel connecting two ends of the valve core (300), the gas flow channel comprising a first vent hole (304) arranged on a side wall of the valve core (300); a sealing ring (600), the sealing ring (600) being sleeved on the valve core (300) and used for sealing the first vent hole (304); a valve stem (200), wherein a portion of the structure of the valve stem (200) is arranged inside the valve body (100), an axis of the valve stem (200) intersects with an axis of the valve body (100), and the valve stem (200) is rotatably connected to the valve body (100); a blocking block (400), the blocking block (400) being arranged inside the valve body (100) and being threadedly connected to the bottom of the valve stem (200), the side wall of the blocking block (400) being in inclined sliding engagement with one end of the valve core (300), the blocking block (400) being used to drive the valve core (300) to slide axially along the valve body (100); A linear limiting mechanism, the linear limiting mechanism is arranged at the bottom of the block (400) and is connected to the valve body (100), and is used to enable the block (400) to move axially along the valve stem (200), the block (400) is a quadrangular pyramid structure, the valve core (300) includes a needle rod (301), the needle rod (301) is slidably connected to the valve body (100), and one end of the needle rod (301) close to the block (400) is a slope structure, and the slope structure is slidably connected to the valve body (100). The blocking block (400) is slidably matched; the needle rod (301) has a second vent hole (305) in the middle, one end of the second vent hole (305) intersects with the inclined surface structure, one end of the second vent hole (305) is connected to the first vent hole (304), the area of ​​the blocking block (400) close to the valve core (300) is larger than the cross-sectional area of ​​the second vent hole (305) at the inclined surface structure, the blocking block (400) has an internal threaded hole in the middle, and the valve stem ( The bottom of the valve core (300) is provided with a threaded section (203), the threaded section (203) being threadedly connected to the internal threaded hole, the end of the valve core (300) close to the blocking block (400) is provided with a clearance groove (306), the clearance groove (306) is used to make way for the threaded section (203) when the valve core (300) moves toward the blocking block (400), and the linear limiting mechanism includes at least two telescopic rods (500), the two telescopic rods (500) are located on the blocking block (400). On both sides of the valve body (100), the telescopic rod (500) is a multi-section structure that can slide along its axis, the bottom of the telescopic rod (500) is fixedly connected to the valve body (100), the top of the telescopic rod (500) is fixedly connected to the block (400), the valve core (300) further comprises a valve plate (302), the valve plate (302) is fixedly connected to an end of the needle rod (301) away from the block (400), and the valve plate (302) is slidably connected to the inner wall of the valve body (100);The gas flow channel also includes a plurality of side holes (303) and the second air vent (305) arranged on the valve plate (302); the valve body (100) has a sleeve structure inside, the sleeve structure is slidably connected to the needle rod (301); the sealing ring (600) abuts against the end surface of the sleeve structure close to the air inlet (101); an elastic member (700) is provided on the needle rod (301), the elastic member (700) is used to provide a thrust for the needle rod (301) to approach the block (400); the elastic member (700) is a spring, which is sleeved on the needle rod (301). The two ends of the spring are respectively connected to the needle rod (301) and the sliding sleeve structure. The spring has elastic force, and the valve stem is driven to rotate manually or mechanically to control the block to rise or fall, and the second vent hole of the gas flow channel and the first vent hole in the gas flow channel are slowly blocked or connected, so that the speed of change of the internal pressure difference of the high-pressure needle valve is reduced, the pressure impact on the sealing ring is reduced, and the sealing ring is prevented from being offset during the closing or opening of the high-pressure needle valve. ; 2. The high pressure resistant needle valve according to claim 1, characterized in that: The valve stem (200) further comprises a force-applying section (201) and a rotating section (202), wherein the force-applying section (201), the rotating section (202) and the threaded section (203) are coaxially arranged; a limiting sleeve (103) is arranged at the top of the valve body (100), and the rotating section (202) is arranged inside the limiting sleeve (103) and is rotatably connected to the limiting sleeve (103); the force-applying section (201) is arranged above the limiting sleeve (103).

3. The high pressure resistant needle valve according to claim 1, characterized in that: Two first ventilation holes (304) are provided, and the two first ventilation holes (304) are symmetrically arranged.

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