A high sealing needle valve

Abstract

The present invention relates to the technical field of needle valve devices, and specifically to a high-sealing needle valve. A high-sealing needle valve includes a valve body, a mounting tube and a sealing mechanism. A mounting cavity is provided in the valve body, and a sealing surface is provided on the inner wall of the mounting cavity. The sealing mechanism includes a sealing assembly, and the sealing assembly includes a sealing rod, a valve head and a rubber block, and a plurality of through holes are provided on the rubber block. The valve head moves downward, and the rubber block first abuts against the sealing surface. When the rubber block continues to move downward, the rubber block moves relative to the sealing surface and scrapes off the impurities on the sealing surface. The sealing rod moves upward, driving the rubber block to move relative to the sealing surface, and scrapes off the impurities on the sealing surface again, and the water flows into the through hole from the gap and takes away the impurities in the through hole, thereby completing the removal of the impurities. The present invention provides a high-sealing needle valve to solve the problem that some foreign matter is mixed between the valve head and the sealing surface of the existing needle valve, resulting in a loose seal.

Description

Technical Field

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

[0002] The needle valve is a high-precision flow regulating valve device, mainly used to cut off or regulate the flow of gas or liquid. The following is some specific introduction to the needle valve: The core component of the needle valve is a slender needle-shaped valve stem. This design makes the needle valve have very high accuracy when adjusting the flow, and can achieve continuous fine adjustment from full closure to maximum opening. The needle valve drives the valve stem up and down by rotating the handwheel or actuator, thereby changing the flow area between the valve core and the valve seat to achieve flow regulation. Due to the shape and material characteristics of the valve core, the needle valve can maintain good sealing performance under high pressure difference and is suitable for occasions where precise flow control is required. Needle valves are widely used in many fields such as chemical industry, petroleum, natural gas, semiconductor manufacturing, laboratory equipment, etc. In these fields, needle valves are used to regulate the flow of various corrosive or non-corrosive media, such as acids, alkalis, solvents, gases, etc. Especially in precision processes that require strict flow control, needle valves play an irreplaceable role. Needle valves have a variety of material options, including stainless steel, brass, carbon steel and various special alloy materials to adapt to different media and working conditions. At the same time, the design of the needle valve also supports a variety of connection methods, such as threaded connection, flange connection, etc., to meet different installation requirements.

[0003] For example, the invention patent with announcement number CN117889222A provides a needle valve, including a valve body and a valve stem structure, the valve body forms a connected valve cavity and a flow cavity, the valve stem structure includes an upper valve stem and a lower valve stem, the upper valve stem drives the lower valve stem to move in the valve cavity, so that the end of the lower valve stem away from the upper valve stem cuts off or opens the flow cavity, avoiding rotation scratches caused by rotation. However, some foreign matter may be mixed between the valve head and the valve seat, resulting in loose sealing and affecting the sealing effect, and the sealing surface of the needle valve is generally made of flexible material, which cannot be over-pressed during use, otherwise it will accelerate the aging of the sealing material and affect the service life. Summary of the invention

[0004] The invention provides a high-sealing needle valve to solve the problem that some foreign matter may be mixed between the valve head and the sealing surface of the existing needle valve, resulting in loose sealing.

[0005] A high-sealing needle valve of the present invention adopts the following technical solution: A high-sealing needle valve comprises a valve body, a mounting cylinder and a blocking mechanism. An mounting cavity and two connecting channels are provided in the valve body, and a sealing surface is provided on the inner wall of the mounting cavity. The two connecting channels are sequentially distributed along the horizontal direction, and the mounting cavity is connected to the two connecting channels. The mounting cylinder is detachably arranged on the valve body, the mounting cylinder is vertically arranged, and the mounting cylinder is connected to the mounting cavity.

[0006] The blocking mechanism includes a blocking assembly, and the blocking assembly includes a blocking rod, a valve head and a rubber block. The blocking rod is vertically arranged, and the blocking rod is slidably arranged up and down in the installation cylinder. The valve head is detachably arranged at the lower end of the blocking rod, and the valve head is in the installation cavity. The rubber block is sleeved on the valve head, and the rubber block is arranged along the circumference of the valve head. A plurality of through holes are provided on the rubber block, and the rubber block is used to abut against the sealing surface. The blocking assembly moves up and down in the installation cavity to block or open two connecting channels. The blocking assembly has a first state and a second state. The first state of the blocking assembly is that there is a gap between the rubber block and the peripheral wall of the valve head, and the rubber block is not in contact with the sealing surface. The second state of the blocking assembly is that the rubber block abuts against the sealing surface, and the valve head abuts against the rubber block.

[0007] Furthermore, a steel ring is fixedly disposed in each through hole.

[0008] Furthermore, a connecting cylinder is fixedly provided at the lower end of the installation cylinder, and the connecting cylinder is threadedly connected to the valve body.

[0009] Furthermore, the blocking mechanism also includes a sealing assembly, which includes a plurality of sealing rings, which are arranged in the installation tube and slidably sleeved on the blocking rod. The plurality of sealing rings are distributed in sequence along the vertical direction, and the sealing ring at the bottom is against the upper end surface of the connecting tube.

[0010] Furthermore, the blocking mechanism also includes an extrusion assembly, which includes a pressure cylinder and a pressure ring, wherein the pressure cylinder is vertically arranged in the installation cylinder, and the outer peripheral wall of the pressure cylinder and the inner peripheral wall of the installation cylinder are threadedly matched. The pressure ring is slidably sleeved on the blocking rod, and the pressure ring is arranged between the sealing ring and the pressure cylinder.

[0011] Furthermore, the blocking mechanism also includes a valve stem, which is vertically arranged and slidably arranged in the pressure cylinder, and the valve stem and the inner circumferential wall of the pressure cylinder are threadedly matched. A connecting block is fixedly arranged at the lower end of the valve stem, and a limiting groove is provided at the upper end of the blocking rod, and the connecting block is rotatably arranged in the limiting groove.

[0012] Furthermore, a handle is fixedly provided on the upper end of the valve stem.

[0013] Furthermore, a mounting platform is fixedly provided at the lower end of the blocking rod, and the mounting platform and the valve head are connected by a plurality of screws.

[0014] Furthermore, the valve head is in a truncated cone shape, and the diameter of the upper end surface of the valve head is greater than the diameter of the lower end surface of the valve head. The rubber block includes a rubber disc and a rubber sheet, and the rubber disc is arranged between the mounting platform and the valve head. The rubber sheet is arranged along the peripheral wall of the valve head, and the rubber sheet and the rubber disc are fixedly connected.

[0015] Furthermore, the two connecting channels are distributed in sequence along the up and down directions, and the installation cavity includes a first cavity and a second cavity. The first cavity and the second cavity are connected, the first cavity is connected to the connecting channel above, and the second cavity is connected to the connecting channel below. The sealing surface is an inverted cone, the sealing surface is in the second cavity, and the sealing surface is used to resist the rubber block.

[0016] The beneficial effects of the present invention are as follows: a high-sealing needle valve of the present invention is provided with a sealing rod, a valve head and a rubber block, and when the sealing assembly is in a first state and the sealing assembly does not block the two connecting channels, liquid passes through the installation cavity and the two connecting channels. When the high-sealing needle valve needs to be closed, the sealing rod moves downward, and the sealing rod drives the valve head and the rubber block to move downward synchronously, and the rubber block first abuts against the sealing surface. When the rubber block continues to move downward, the rubber block moves relative to the sealing surface and scrapes off the impurities on the sealing surface, and the impurities enter the through hole. When the valve head moves down to contact with the rubber block, the two connecting channels are blocked, and the sealing assembly is in the second state.

[0017] When the high-sealing needle valve needs to be opened, the sealing rod first drives the valve head to move upward, and then a gap appears between the valve head and the rubber block, and then drives the rubber block to move relative to the sealing surface. When the rubber block moves, the impurities on the sealing surface are scraped off again, and the water flows into the through hole from the gap and takes away the impurities in the through hole, thereby completing the removal of impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 A schematic structural diagram of a high-sealing needle valve provided by an embodiment of the present invention;

[0020] Figure 2 A front view of a high-sealing needle valve provided by an embodiment of the present invention;

[0021] Figure 3 for Figure 2 Sectional view at AA in the middle;

[0022] Figure 4 A schematic diagram of the structure of a high-sealing needle valve provided by an embodiment of the present invention when the valve head and the rubber block are against each other;

[0023] Figure 5 for Figure 3 The enlarged view of point B in the middle;

[0024] Figure 6 for Figure 4 Enlarged view of point C in the middle;

[0025] Figure 7 An exploded diagram of a high-sealing needle valve provided by an embodiment of the present invention;

[0026] Figure 8 for Figure 7 Enlarged view of point D in the middle.

[0027] In the figure: 100, valve body; 101, installation cavity; 102, connecting channel; 103, first cavity; 104, second cavity; 201, installation cylinder; 202, pressure cylinder; 203, sealing ring; 204, blocking rod; 205, connecting cylinder; 206, pressure ring; 301, valve head; 302, rubber block; 3021, rubber disc; 3022, rubber sheet; 303, steel ring; 304, mounting table; 305, through hole; 306, screw; 401, valve stem; 402, handle; 403, connecting block. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0029] Reference Figures 1 to 8 As shown, a high-sealing needle valve provided by an embodiment of the present invention includes a valve body 100, a mounting cylinder 201 and a blocking mechanism. An mounting cavity 101 and two connecting channels 102 are provided in the valve body 100, and a sealing surface is provided on the inner wall of the mounting cavity 101. The two connecting channels 102 are sequentially distributed along the horizontal direction, and the mounting cavity 101 is connected to the two connecting channels 102. The mounting cylinder 201 is detachably arranged on the valve body 100, and the mounting cylinder 201 is vertically arranged, and the mounting cylinder 201 is connected to the mounting cavity 101.

[0030] The blocking mechanism includes a blocking assembly, which includes a blocking rod 204, a valve head 301 and a rubber block 302. The blocking rod 204 is vertically arranged, and the blocking rod 204 is slidably arranged in the installation cylinder 201 up and down. The valve head 301 is detachably arranged at the lower end of the blocking rod 204, and the valve head 301 is in the installation cavity 101. The rubber block 302 is sleeved on the valve head 301, and the rubber block 302 is arranged along the circumference of the valve head 301. A plurality of through holes 305 are provided on the rubber block 302, and the rubber block 302 is used to abut against the sealing surface. The blocking assembly moves up and down in the installation cavity 101 to block or open the two connecting channels 102. The blocking assembly has a first state and a second state. The first state of the blocking assembly is that there is a gap between the rubber block 302 and the peripheral wall of the valve head 301, and the rubber block 302 is not in contact with the sealing surface. The second state of the plugging assembly is that the rubber block 302 and the sealing surface abut against each other, and the valve head 301 and the rubber block 302 abut against each other.

[0031] When the plugging assembly is in the first state and the plugging assembly does not block the two connecting channels 102, the liquid passes through the installation cavity and the two connecting channels 102. When the high-sealing needle valve needs to be closed, the plugging rod 204 moves downward, and the plugging rod 204 drives the valve head 301 and the rubber block 302 to move downward synchronously, and the rubber block 302 first contacts the sealing surface. When the rubber block 302 continues to move downward, the rubber block 302 moves relative to the sealing surface and scrapes off the impurities on the sealing surface, and the impurities enter the through hole 305. When the valve head 301 moves down to contact the rubber block 302, the plugging of the two connecting channels 102 is completed, and the plugging assembly is in the second state.

[0032] When the high-sealing needle valve needs to be opened, the sealing rod 204 first drives the valve head 301 to move upward, and then drives the rubber block 302 to move relative to the sealing surface after a gap appears between the valve head 301 and the rubber block 302. When the rubber block 302 moves, the impurities on the sealing surface are scraped off again, and the water flows into the through hole 305 from the gap and takes away the impurities in the through hole 305, thereby completing the removal of the impurities.

[0033] In this embodiment, a steel ring 303 is fixedly disposed in each through hole 305. The steel ring 303 supports the rubber block 302. Since there is water in each through hole 305, when the valve head 301 squeezes the rubber sheet 3022, the downward force of the valve head 301 is borne by the water, and the indirect force acts on the steel ring 303, preventing the water in the through hole 305 from being squeezed and expanded when the rubber block 302 is squeezed, thereby preventing the rubber block 302 and the valve head 301 from being damaged.

[0034] In this embodiment, a connecting cylinder 205 is fixedly provided at the lower end of the installation cylinder 201 , and the connecting cylinder 205 and the valve body 100 are threadedly connected to facilitate the disassembly of the installation cylinder 201 .

[0035] In this embodiment, the blocking mechanism further includes a sealing assembly, which includes a plurality of sealing rings 203, which are disposed in the mounting tube 201 and are slidably sleeved on the blocking rod 204. The plurality of sealing rings 203 are sequentially distributed along the vertical direction, and the upper end surface of the sealing ring 203 at the bottom abuts against the upper end surface of the connecting tube 205. The sealing ring 203 blocks the gap between the connecting tube 205 and the blocking rod 204.

[0036] In this embodiment, the blocking mechanism further includes an extrusion assembly, which includes a pressing cylinder 202 and a pressing ring 206. The pressing cylinder 202 is vertically arranged in the installation cylinder 201, and the outer peripheral wall of the pressing cylinder 202 and the inner peripheral wall of the installation cylinder 201 are threadedly matched. The pressing ring 206 is slidably sleeved on the blocking rod 204, and the pressing ring 206 is arranged between the sealing ring 203 and the pressing cylinder 202.

[0037] During installation, firstly thread the connecting tube 205 and the valve body 100 together, and then put the pressure tube 202 into the installation tube 201. When the pressure tube 202 is gradually screwed into the installation tube 201, it squeezes the pressure ring 206 and multiple sealing rings 203, further tightening the sealing ring 203 to improve the sealing effect of the sealing ring 203.

[0038] In this embodiment, the blocking mechanism further includes a valve stem 401, which is vertically arranged and slidably arranged in the pressure cylinder 202, and the valve stem 401 and the inner circumferential wall of the pressure cylinder 202 are threadedly matched. The friction between the pressure cylinder 202 and the mounting cylinder 201 is greater than the friction between the valve stem 401 and the pressure cylinder 202. A connecting block 403 is fixedly arranged at the lower end of the valve stem 401, and a limiting groove is provided at the upper end of the blocking rod 204, and the connecting block 403 is rotatably arranged in the limiting groove. The valve stem 401 rotates while moving along the axial direction of the pressure cylinder 202, thereby driving the blocking rod 204 to move up and down.

[0039] In this embodiment, a handle 402 is fixedly provided on the upper end of the valve stem 401 .

[0040] In this embodiment, a mounting platform 304 is fixedly provided at the lower end of the blocking rod 204 , and the mounting platform 304 and the valve head 301 are connected by a plurality of screws 306 .

[0041] In this embodiment, the valve head 301 is in a truncated cone shape, and the diameter of the upper end surface of the valve head 301 is greater than the diameter of the lower end surface of the valve head 301. The rubber block 302 includes a rubber disc 3021 and a rubber sheet 3022. The rubber disc 3021 is arranged between the mounting platform 304 and the valve head 301, and the screw 306 passes through the rubber disc 3021. The rubber sheet 3022 is arranged along the peripheral wall of the valve head 301, and the rubber sheet 3022 and the rubber disc 3021 are fixedly connected.

[0042] In this embodiment, the two connecting channels 102 are distributed in sequence along the up and down directions. The installation cavity 101 includes a first cavity 103 and a second cavity 104. The first cavity 103 and the second cavity 104 are connected. The first cavity 103 is connected to the connecting channel 102 located above, and the second cavity 104 is connected to the connecting channel 102 located below. The sealing surface is a conical surface with a larger upper end and a smaller lower end. The sealing surface is in the second cavity 104, and the sealing surface is used to resist the rubber block 302.

[0043] Working process: During installation, firstly thread the connecting tube 205 and the valve body 100 together, and then put the pressure tube 202 into the installation tube 201. When the pressure tube 202 is gradually screwed into the installation tube 201, it squeezes the pressure ring 206 and multiple sealing rings 203, further tightens the sealing ring 203, improves the sealing effect of the sealing ring 203, and the pressure tube 202 no longer moves downward.

[0044] When the blocking assembly is in the first state and the valve head 301 is in the first cavity 103 , there is a gap between the rubber block 302 and the valve head 301 , and liquid passes through the installation cavity and the two connecting channels 102 .

[0045] When the high-sealing needle valve needs to be closed, the handle 402 is turned forward, and the handle 402 drives the valve stem 401 to rotate. Since the valve stem 401 and the pressure cylinder 202 are threadedly matched, the valve stem 401 moves downward while rotating, and the valve stem 401 drives the blocking rod 204 to move downward, and the blocking rod 204 drives the valve head 301 and the rubber block 302 to move downward synchronously, and the rubber sheet 3022 first contacts the sealing surface. When the rubber sheet 3022 continues to move downward, the rubber sheet 3022 moves relative to the sealing surface and scrapes off the impurities on the sealing surface, and the scraped impurities enter the steel ring 303. When the valve head 301 moves down to contact the rubber sheet 3022, the valve head 301 can no longer move downward due to the support of the steel ring 303. At this time, the handle 402 is no longer turned and the blocking assembly is in the second state. The rubber block 302 seals the mounting cavity while preventing the valve head 301 from contacting with the sealing surface, thereby preventing the valve head 301 and the sealing surface from being worn and affecting the sealing effect, thereby effectively solving the problem of excessive sealing force causing damage to the valve head 301 .

[0046] Each steel ring 303 is in a through hole 305, supporting the rubber block 302. Since there is water in each through hole 305, when the valve head 301 squeezes the rubber sheet 3022, the downward force of the valve head 301 is borne by the water, and the indirect force acts on the steel ring 303, preventing the water in the through hole 305 from being squeezed and expanded when the rubber block 302 is squeezed, thereby preventing the rubber block 302 and the valve head 301 from being damaged.

[0047] When the high-sealing needle valve needs to be opened, the handle 402 is rotated in the opposite direction. Since the friction between the pressure cylinder 202 and the installation cylinder 201 is greater than the friction between the valve stem 401 and the pressure cylinder 202, the handle 402 drives the valve stem 401 to rotate relative to the pressure cylinder 202 and move upward. The valve stem 401 drives the blocking rod 204 to move upward. The blocking rod 204 first drives the valve head 301 to move upward, and then drives the rubber sheet 3022 to move relative to the sealing surface after a gap appears between the valve head 301 and the rubber sheet 3022. When the rubber sheet 3022 moves, the impurities on the sealing surface are scraped off again. The water flows into the through hole 305 from the gap and takes away the impurities in the through hole 305, thereby completing the removal of impurities.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high sealing needle valve, characterized in that: It comprises a valve body, a mounting cylinder and a blocking mechanism; a mounting cavity and two connecting channels are provided in the valve body, and a sealing surface is provided on the inner wall of the mounting cavity; the two connecting channels are sequentially distributed along the horizontal direction, and the mounting cavity is connected with the two connecting channels; the mounting cylinder is detachably arranged on the valve body, the mounting cylinder is vertically arranged, and the mounting cylinder is connected with the mounting cavity; The sealing mechanism includes a sealing component, which includes a sealing rod, a valve head and a rubber block; the sealing rod is vertically arranged, and the sealing rod is slidably arranged in the installation cylinder up and down, the valve head is detachably arranged at the lower end of the sealing rod, and the valve head is in the installation cavity; the rubber block is sleeved on the valve head, and the rubber block is arranged along the circumference of the valve head. A plurality of through holes are opened on the rubber block, and the rubber block is used to abut against the sealing surface; the sealing component moves up and down in the installation cavity to block or open two connecting channels; the sealing component has a first state and a second state, and the first state of the sealing component is that there is a gap between the rubber block and the peripheral wall of the valve head, and the rubber block is not in contact with the sealing surface; the second state of the sealing component is that the rubber block abuts against the sealing surface, and the valve head abuts against the rubber block; a steel ring is fixedly arranged in each through hole.

2. A high sealing needle valve according to claim 1, characterized in that: A connecting cylinder is fixedly arranged at the lower end of the installation cylinder, and the connecting cylinder is threadedly connected to the valve body.

3. A high sealing needle valve according to claim 2, characterized in that: The sealing mechanism also includes a sealing assembly, which includes multiple sealing rings. The sealing rings are arranged in the installation tube and slidably mounted on the sealing rod; the multiple sealing rings are distributed in sequence along the vertical direction, and the lowermost sealing ring and the upper end surface of the connecting tube are against each other.

4. A high sealing needle valve according to claim 3, characterized in that: The sealing mechanism also includes an extrusion assembly, which includes a pressure cylinder and a pressure ring. The pressure cylinder is vertically arranged in the installation cylinder, and the outer circumferential wall of the pressure cylinder and the inner circumferential wall of the installation cylinder are threadedly matched; the pressure ring is slidably mounted on the sealing rod, and the pressure ring is arranged between the sealing ring and the pressure cylinder.

5. A high sealing needle valve according to claim 4, characterized in that: The blocking mechanism also includes a valve stem, which is vertically arranged and slidably arranged in the pressure cylinder. The valve stem and the inner circumferential wall of the pressure cylinder are threadedly matched. A connecting block is fixedly arranged at the lower end of the valve stem, and a limiting groove is opened at the upper end of the blocking rod, and the connecting block is rotatably arranged in the limiting groove.

6. A high sealing needle valve according to claim 5, characterized in that: A handle is fixedly arranged on the upper end of the valve stem.

7. A high sealing needle valve according to claim 1, characterized in that: A mounting platform is fixedly arranged at the lower end of the blocking rod, and the mounting platform and the valve head are connected by a plurality of screws.

8. A high sealing needle valve according to claim 7, characterized in that: The valve head is in a frustum shape, and the diameter of the upper end surface of the valve head is larger than the diameter of the lower end surface of the valve head; the rubber block includes a rubber disc and a rubber sheet, and the rubber disc is arranged between the mounting platform and the valve head; the rubber sheet is arranged along the peripheral wall of the valve head, and the rubber sheet and the rubber disc are fixedly connected.

9. A high sealing needle valve according to claim 8, characterized in that: The two connecting channels are distributed in sequence along the up and down directions. The installation cavity includes a first cavity and a second cavity. The first cavity and the second cavity are connected. The first cavity is connected to the connecting channel above, and the second cavity is connected to the connecting channel below. The sealing surface is an inverted cone, and the sealing surface is in the second cavity. The sealing surface is used to resist the rubber block.

Images