A high pressure resistant sealed valve

Abstract

The application relates to a high-pressure-resistant sealed valve, which comprises a valve body with a cavity, a valve cover arranged at the top end of the valve body, a valve rod arranged in the valve body, a sealing assembly arranged between the valve rod and the valve body, one end of the sealing assembly being fixed to the valve body and the other end being fixed to the valve rod, and the sealing assembly comprising rigid support rings and flexible stretching rings arranged alternately, wherein the flexible stretching rings and the rigid support rings are fixed through inner ring parts and outer ring parts in the axial direction of the valve rod. The valve has good high-pressure resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valve, in particular to a high-pressure-resistant sealing valve. BACKGROUND

[0002] The statements herein are provided only to enhance understanding of the present application and are not necessarily intended to constitute the prior art.

[0003] As an important component in fluid system, valve is widely used in all aspects of life, and the sealing performance is the basic performance of valve. The sealing of valve is divided into internal sealing and external sealing, and the external sealing mainly refers to the sealing of valve stem and valve cover. At present, the sealing of valve stem is mainly achieved by using packing. In order to improve the sealing performance of valve stem, bellows sealing structure is used in some strict and harsh operating conditions. However, the inventors find that the bellows is a thin-walled structure, and when the medium pressure is large, the bellows will be deformed due to bulging or be crushed and lose stability. Therefore, the valve with the existing bellows structure cannot withstand a large working pressure. At the same time, the axial deformation of the bellows will generate a large axial stress, which limits the axial deformation of the bellows, thereby limiting the opening of the valve. In order to achieve the required opening of the valve, the total length of the valve stem and the bellows needs to be increased, which increases the size and cost of the valve. Increasing the wave depth of the bellows can increase the axial extension of the bellows. However, the existing bellows structure, processing method and material performance limit the increase of the wave depth of the bellows, thereby limiting the axial extension of the bellows. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a high-pressure-resistant sealing valve, which overcomes the defects of the bellows sealing, is resistant to high pressure, and has a large valve opening.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical scheme

[0006] In a first aspect, the embodiments of the present application provide a high-pressure-resistant sealing valve, which comprises a valve body having a cavity inside, a valve cover arranged at the top end of the valve body, a valve stem arranged inside the valve body, and a sealing assembly arranged between the valve stem and the valve body. One end of the sealing assembly is fixed to the valve body, and the other end is fixed to the valve stem. The sealing assembly comprises rigid support rings and flexible stretching rings arranged alternately. Along the axial direction of the valve stem, the flexible stretching rings and the rigid support rings are fixed alternately through the inner ring part and the outer ring part.

[0007] Optionally, the flexible stretching ring connected with the rigid support rings on both sides comprises a stretching part. The inner ring edge of the stretching part is provided with a first bending part, and the first bending part is fixed to the inner ring surface of the rigid support ring on one side of the flexible stretching ring. The outer ring edge of the stretching part is provided with a second bending part, and the second bending part is fixed to the outer ring surface of the rigid support ring on the other side of the flexible stretching ring.

[0008] Optionally, the flexible stretching ring connected with the rigid support ring on both sides is fixed with the rigid support ring on one side through the opposite inner ring edge, and is fixed with the rigid support ring on the other side through the opposite outer ring edge.

[0009] Optionally, the rigid support ring is made of metal material or polymer material.

[0010] Optionally, the flexible stretching ring is made of elastic-plastic material.

[0011] Optionally, the side of the sealing assembly away from the valve rod is a medium flow cavity in the valve body, the end of the valve rod in the medium flow cavity is provided with a valve core, the valve body is provided with a first flow hole matched with the valve core, and the valve body corresponding to the medium flow cavity is further provided with a second flow hole.

[0012] Optionally, the valve core is a cylindrical plug, or the outer side surface of the valve core has a conical surface or a spherical surface or a semispherical surface, and the shape of the first flow hole matches the shape of the valve core.

[0013] Optionally, the end of the valve cover for connecting with the valve body is provided with an annular insertion block, and correspondingly, the end of the valve body for connecting with the valve cover is provided with an annular insertion slot matched with the insertion block, the insertion block of the valve cover is inserted into the insertion slot of the valve body and is welded or bonded with the valve body.

[0014] Optionally, the outer edge portion of the rigid support ring or the flexible stretching ring of the sealing assembly for connecting with the valve body extends into the bottom groove surface between the insertion block and the insertion slot, and the outer edge thereof is fixed with the side groove surface of the insertion slot.

[0015] Optionally, the valve cover and the valve body are detachably connected and fixed.

[0016] The beneficial effects of the present application are as follows:

[0017] 1. The valve of the present application has alternating rigid support rings and flexible stretching rings, when the sealing assembly is in a compressed state under the pressure of the flowing medium, the rigid support ring can support the flexible stretching ring to form an integral structure, and can withstand higher pressure, overcoming the problem that the existing corrugated pipe sealing fails due to deflation or bulging deformation when the pressure is high.

[0018] 2. The valve of the present application, since the flexible stretching ring and the rigid support ring are fixedly connected by welding, compared with the processing method of the traditional corrugated pipe, the influence of the processing method and the material itself on the wave depth is eliminated, and the wave depth is not limited, so that the sealing assembly has a larger stretching and contracting stroke capacity, and the size of the stretching and contracting capacity can be adjusted by adjusting the size of the flexible stretching ring and the rigid support ring, solving the problem of small valve opening of the existing corrugated pipe sealing. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.

[0020] Figure 1 This is a front view of the overall structure of Embodiment 1 of the present invention;

[0021] Figure 2 This is a front view of the overall structure of Embodiment 2 of the present invention;

[0022] Among them, 1. Inner ring weld point, 2. Flexible tension ring, 3. Valve body, 4. Valve core, 5. Valve stem, 6. Outer ring weld point, 7. Rigid support ring, 8. Valve cover. Detailed Implementation

[0023] For ease of description, the words "upper" and "lower" appearing in this invention only indicate that they are consistent with the upper and lower directions of the accompanying drawings and do not limit the structure. They are merely for the purpose of facilitating the description of this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] Example 1

[0025] This embodiment provides a valve with a high-pressure resistant seal, such as... Figure 1 As shown, the valve includes a valve body 3, a valve cover 8 is fixedly connected to the top of the valve body 3, and a valve stem 5 is also provided inside the valve body 3. The valve stem 5 is coaxially arranged with the valve body 3 and the valve cover 8. One end of the valve stem 5 passes through the valve cover 8 and is slidably connected to the valve cover 8 so that the valve stem 5 can move along its own axis.

[0026] In this embodiment, the valve cover 8 includes a bottom cover and a side cover fixed to the edge of the bottom cover. An annular insert is provided at the inner edge of the side cover. Correspondingly, the end of the valve body 3 used to connect with the valve cover is provided with an annular slot that matches the insert. The insert is inserted into the slot to position the valve cover 8 and the valve body 3. At the same time, the end face of the valve cover 8 at the end other than the insert is welded and fixed to the end face of the valve body 3 to achieve a fixed connection between the valve body 3 and the valve cover 8.

[0027] In another embodiment, the end face of the valve cover 8 at the non-insertion block end is bonded and fixed to the end face of the valve body 3 to achieve a fixed connection between the valve body 3 and the valve cover 8.

[0028] In another embodiment, the end of the valve cover 8 that is connected to the valve body 3 is provided with a flange, and the end of the valve body 3 that is connected to the valve cover is provided with a flange. The valve body 3 and the valve cover 8 are detachably and fixedly connected by the flange and fixing bolts and fixing nuts, or the valve body 3 and the valve cover 8 are directly threaded together.

[0029] A sealing assembly is arranged between the valve stem 5 and the valve body 3 in the inner space of the valve body 3. The space between the sealing assembly and the bottom end of the valve body is a medium flow chamber for the flow of gas or liquid medium.

[0030] The valve stem 5 passes through the valve cover 8 and is located outside the valve body 3 at one end, and extends into the medium flow chamber at the other end after passing through the sealing assembly, and the end is provided with a valve core 4, which is connected with the end of the valve stem 5 through a ball head.

[0031] In another embodiment, the valve stem 5 and the valve core 4 are arranged as a whole, or the valve stem 5 and the valve core 4 are welded, or the valve stem 5 and the valve core 4 are screwed, or the valve stem 5 and the valve core 4 are connected by a pin, etc. The driving mode of the valve stem can adopt worm gear transmission or gear transmission, etc. The skilled person can set it according to the actual need, which will not be described in detail here.

[0032] The bottom of the valve body 3 is provided with a first flow hole capable of cooperating with the valve core 4. The valve stem 5 moves along its own axis direction, which can drive the valve core 4 to move along the axis direction of the valve stem 5, thereby realizing the opening and closing of the first flow hole.

[0033] The second flow hole is arranged on the side of the valve body 3, and the second flow hole can be used as a medium inlet, and correspondingly, the first flow hole can be used as a medium outlet, or the first flow hole can be used as a medium inlet, and correspondingly, the second flow hole can be used as a medium outlet.

[0034] In order to better seal the first flow hole by the valve core 4, the valve core 4 is provided with a tapered portion, that is, the outer side surface has a tapered surface, and the end of the valve core 4 with smaller area is arranged towards the first flow hole, and correspondingly, the first flow hole adopts a tapered hole matched with the tapered surface.

[0035] In another embodiment, the valve core 4 adopts a cylindrical plug, or the outer surface of the valve core has a spherical surface or a hemispherical surface, etc. The skilled person can set it according to the actual need, and the shape of the first flow hole is matched with the shape of the valve core 4.

[0036] The sealing assembly includes at least one flexible stretching ring 2 and one rigid support ring 7. In this embodiment, it includes a plurality of rigid support rings 7 and a plurality of flexible stretching rings 2. The plurality of rigid support rings 7 and the flexible stretching rings 2 are arranged alternately, and the rigid support rings 7 and the flexible stretching rings 2 all adopt a ring structure and are sleeved on the outer periphery of the valve stem 5.

[0037] The number of flexible stretching rings 2 and rigid support rings 7 is determined according to the valve opening stroke, the size of the inner and outer diameters of the ring, the wall thickness of the ring and other factors.

[0038] The thickness of the flexible stretch ring 2 and the rigid support ring 7 can meet the deformation amount of the sealing assembly moving with the valve rod, and realize the function of opening and closing the valve.

[0039] One end of the sealing assembly is fixed with the valve body, and the other end is fixed with the valve rod. In another embodiment, the end of the sealing assembly close to the valve cover is fixed with the valve body, and the other end is fixed with the valve rod.

[0040] In this embodiment, the end of the sealing assembly close to the valve cover is fixed with the valve body, and the other end is fixed with the valve rod.

[0041] The end of the sealing assembly is a rigid support ring 7 or a flexible stretch ring 2 or one end is a rigid support ring 7 and the other end is a flexible stretch ring 2.

[0042] In this embodiment, both ends of the sealing assembly are rigid support rings 7.

[0043] The rigid support ring 7 is made of a metal material or a polymer material with a certain rigidity, preferably, the rigid support ring is made of stainless steel material.

[0044] The flexible support ring 2 is made of a elastic-plastic material, preferably, the flexible support ring 2 is made of rubber or silicone material.

[0045] In this embodiment, the thickness of the rigid support ring 7 is greater than the thickness of the flexible stretch ring 2. The thickness of the rigid support ring 7 can meet the support pressure requirement, and the thickness of the flexible stretch ring 2 can meet the deformation requirement. The specific thickness of the rigid support ring 7 and the flexible stretch ring 2 can be set according to the actual situation.

[0046] The outer ring surface of the rigid support ring 7 located at the top end, i.e. the rigid support ring 7 closest to the valve cover 8, is fixedly connected with the valve body 3.

[0047] Specifically, the outer edge of the topmost rigid support ring 7 extends into the bottom groove surface between the plug and the slot, and the outer ring surface of the rigid support ring 7 is welded and fixed with the side groove surface of the slot.

[0048] The inner ring surface of the rigid support ring 7 located at the bottom end is fixed with the valve rod 5. Specifically, the inner ring surface of the rigid support ring 7 located at the bottom end is welded and fixed with the outer peripheral surface of the valve rod 5.

[0049] In this embodiment, the inner ring edge of the flexible stretch ring 2 is provided with a first bending part, which is bent upwards, i.e., in the direction of the valve cover, and is fixed to the inner ring surface of the rigid support ring 7 above the flexible stretch ring 2. Specifically, the first bending part is fixed to the inner ring surface of the rigid support ring above by welding, bonding or fusion. In this embodiment, the first bending part is fixed to the inner ring surface of the rigid support ring by welding, and a plurality of inner ring welding points 1 are arranged between the first bending part and the inner ring surface of the rigid support ring.

[0050] The outer ring edge of the flexible stretch ring 2 is provided with a second bending part, which is bent downwards, i.e., in the direction of the valve core 4, and is fixed to the outer ring surface of the rigid support ring 7 below the flexible stretch ring 2. Specifically, the second bending part is fixed to the outer ring surface of the rigid support ring 7 below by welding, bonding or fusion. In this embodiment, the second bending part is fixed to the outer ring surface of the rigid support ring 7 by welding, and a plurality of outer ring welding points 6 are arranged between the second bending part and the outer ring surface of the rigid support ring 7.

[0051] With this arrangement, the flexible stretch ring and the rigid support ring are alternately fixed by the inner ring part and the outer ring part along the axis direction of the valve stem.

[0052] When the valve is closed, the valve stem 5 moves in the direction of the first flow hole, and the valve core 4 blocks the first flow hole. During the movement of the valve stem 5, the rigid support ring 7 drives the flexible stretch ring 2 to deform, meeting the stroke requirement of the valve stem 5. When the valve is opened, the valve stem 5 moves away from the first flow hole, and the valve core 4 opens the first flow hole. The flexible stretch ring 2 returns to the initial position, so that the flexible stretch ring 2 is in close contact with the rigid support ring 7, and the flexible stretch ring 2 and the rigid support ring 7 form an integral whole, which jointly bears the pressure of the medium. Compared with the bellows seal, the pressure bearing capacity of the valve can be effectively improved, and the problem that the bellows seal fails due to deflation or bulging deformation when the pressure bearing capacity is high can be overcome. Moreover, the sealing assembly of this embodiment does not have the most vulnerable parts of the bellows, and the overall structure is more stable. In this embodiment, “high pressure resistance” means that the maximum pressure bearing capacity of the valve of this embodiment reaches 70 MPa or above.

[0053] The sealing method of the valve stem of the valve of this embodiment includes the following steps:

[0054] Step 1: Design appropriate parameters such as the wall thickness, shape, inner and outer diameters of the rigid support ring 7 and the flexible stretch ring 2 according to the opening and closing stroke of the valve, the structure of the valve, the medium pressure, etc.

[0055] Step 2: Manufacture appropriate molds according to the designed flexible stretch ring 2 and rigid support ring 7;

[0056] Step 3: The rigid support ring 7 and the flexible stretch ring 2 are produced by a stamping process.

[0057] Step 4: The flexible stretch ring 2 and the rigid support ring 7 are alternately stacked according to the designed number of layers of the flexible stretch ring 2 and the rigid support ring 7, and the inner ring welding points 1 or the outer ring welding points 6 are alternately welded when each layer of the flexible stretch ring 2 or the rigid support ring 7 is stacked.

[0058] In other embodiments, the flexible stretch ring and the rigid support ring are fixed by bonding or welding.

[0059] Step 5: The inner ring surface of the welded rigid support ring 7 at the bottom end of the sealing assembly is welded to the valve stem 5, and the outer ring surface of the rigid support ring 7 at the top end is welded to the valve body 3.

[0060] The sealing method of the embodiment eliminates the influence of the processing method and the material itself on the wave depth, is not limited by the wave depth, has a larger stretching and contracting stroke capacity, and adjusts the size of the stretching and contracting capacity by adjusting the size of the flexible stretch ring and the rigid support ring, thereby solving the problem of small valve opening of the existing corrugated pipe sealing.

[0061] Embodiment 2

[0062] The embodiment provides a high-pressure-resistant sealing valve, as shown in the figure, which comprises a plurality of alternately arranged rigid support rings 7 and flexible stretch rings 2. Figure 2 The inner ring surface of the flexible stretch ring 2 is welded and fixed with the inner ring part of the rigid support ring 7 above it, and a plurality of inner ring welding points 1 are arranged between the inner ring surface of the flexible stretch ring and the inner ring surface of the rigid support ring above it.

[0063] The outer ring surface of the flexible stretch ring 2 is welded and fixed with the outer ring surface of the rigid support ring 7 below it, and a plurality of outer ring welding points 6 are arranged between the outer ring surface of the flexible stretch ring 2 and the outer ring surface of the rigid support ring 7 below it.

[0064] The other structures of the valve and the valve stem sealing method of the embodiment are the same as those of Embodiment 1 and are not repeated here.

[0065] Embodiment 3

[0066] The embodiment provides a high-pressure-resistant sealed valve, a sealing assembly of the valve comprises a plurality of rigid support rings 7 and flexible stretching rings 2 arranged alternately, both ends of the sealing assembly are the flexible stretching rings, and the outer edge of the flexible stretching ring closest to the end of the valve cover extends into the bottom groove surface between the plug and the slot and is fixed by being bonded or welded or fused to the side groove surface of the slot, and the inner ring surface of the flexible stretching ring at the other end is fixed by being welded or bonded or fused after being welded or bonded to the valve rod, and other embodiments are the same as those in Embodiment 1 or Embodiment 2, and will not be described in detail herein.

[0067] Embodiment 4

[0068] The embodiment provides a high-pressure-resistant sealed valve, a sealing assembly of the valve comprises a plurality of rigid support rings 7 and flexible stretching rings 2 arranged alternately, both ends of the sealing assembly are the flexible stretching rings, and the outer edge of the flexible stretching ring closest to the end of the valve cover extends into the bottom groove surface between the plug and the slot and is fixed by being bonded or welded or fused to the side groove surface of the slot, and the inner ring surface of the flexible stretching ring at the other end is fixed by being welded or bonded or fused after being welded or bonded to the valve rod, and other embodiments are the same as those in Embodiment 1 or Embodiment 2, and will not be described in detail herein.

[0069] Embodiment 5

[0070] The embodiment provides a high-pressure-resistant sealed valve, a sealing assembly of the valve comprises a plurality of rigid support rings 7 and flexible stretching rings 2 arranged alternately, both ends of the sealing assembly are the flexible stretching rings, and the outer edge of the flexible stretching ring closest to the end of the valve cover extends into the bottom groove surface between the plug and the slot and is fixed by being bonded or welded or fused to the side groove surface of the slot, and the inner ring surface of the flexible stretching ring at the other end is fixed by being welded or bonded or fused after being welded or bonded to the valve rod, and other embodiments are the same as those in Embodiment 1 or Embodiment 2, and will not be described in detail herein.

[0071] Embodiment 6

[0072] Compared with Embodiment 5, the difference is that both ends of the sealing assembly are the flexible stretching rings 2, the inner ring surface of the flexible stretching ring 2 closest to the valve cover 8 is fixed by being welded or bonded or fused to the valve rod 5, and the other flexible stretching ring 2 is fixed by being welded or bonded or fused to the inner side surface of the valve body 3.

[0073] Embodiment 7

[0074] Compared with Embodiment 6, the difference is that one end of the sealing assembly closest to the valve cover 8 is the rigid support ring 7, and the other end is the flexible stretching ring 2, the inner ring surface of the rigid support ring 7 at the end is fixed by being welded to the valve rod 5, and the other flexible stretching ring 2 is fixed by being welded or bonded or fused to the inner surface of the valve body.

[0075] Embodiment 8

[0076] Compared with the embodiment 7, the only difference is that the sealing assembly is provided with a flexible stretch ring 2 at one end close to the valve cover 8 and a rigid support ring 7 at the other end, the flexible stretch ring 2 is welded or fused or bonded with the valve stem 5, and the rigid support ring is welded with the inner side of the valve body 3.

[0077] Embodiment 9

[0078] Compared with the embodiment 1, the only difference is that the embodiment is provided with only one flexible stretch ring 2, and the flexible stretch ring is provided with rigid support rings 7 at both sides, the outer ring surface of the upper rigid support ring 7 is fixed with the valve body 3, the inner ring surface of the lower rigid support ring 7 is fixed with the valve stem 5, the outer ring part of the flexible stretch ring 2 is fixed with the outer ring surface of the lower rigid support ring 7, and the inner ring part of the flexible stretch ring 2 is fixed with the inner ring part of the upper rigid support ring 7, and other structures are the same as those of the embodiment 1, which will not be described in detail.

[0079] Embodiment 10

[0080] Compared with the embodiment 1, the only difference is that the embodiment is provided with only one rigid support ring 7, and the rigid support ring is provided with flexible stretch rings 2 at the upper side and the lower side, the outer ring part of the upper flexible stretch ring 2 is fixed with the valve body 3, the inner ring part of the lower flexible stretch ring 2 is fixed with the valve stem 5, the outer ring part of the rigid support ring 7 is fixed with the outer ring part of the lower flexible stretch ring 2, and the inner ring part of the rigid support ring 7 is fixed with the inner ring part of the upper flexible stretch ring.

[0081] Although the specific embodiments of the present application are described above with reference to the accompanying drawings, the present application is not limited to the above embodiments, and various modifications or changes can be made by those skilled in the art without departing from the scope of the present application.

Claims

1. A high-pressure resistant and sealed valve, comprising a valve body with an internal cavity, a valve cover at the top of the valve body, a valve stem inside the valve body passing through the valve cover, and a sealing assembly between the valve stem and the valve body, one end of the sealing assembly being fixed to the valve body and the other end being fixed to the valve stem, characterized in that, The sealing assembly includes alternating rigid support rings and flexible tension rings, which are fixed alternately through inner and outer ring portions along the valve stem axis. The flexible tension ring connected to rigid support rings on both sides includes a tensioning part. The inner ring edge of the tensioning part is provided with a first bending part, which is fixed to the inner ring surface of the rigid support ring on one side of the flexible tension ring. The outer ring edge of the tensioning part is provided with a second bending part, which is fixed to the outer ring surface of the rigid support ring on the other side of the flexible tension ring. The flexible tension ring, which is connected to the rigid support ring on both sides, is fixed to the rigid support ring on one side of the ring through the opposite inner ring edge, and the flexible tension ring is fixed to the rigid support ring on the other side of the ring through the opposite outer ring edge.

2. The high-pressure resistant sealing valve as described in claim 1, characterized in that, The rigid support ring is made of metal or polymer materials.

3. The high-pressure resistant sealing valve as described in claim 1, characterized in that, The flexible tension ring is made of an elastic-plastic material.

4. The high-pressure resistant sealing valve as described in claim 1, characterized in that, The side of the sealing assembly away from the valve stem is the medium flow chamber inside the valve body. The valve stem is provided with a valve core at the end located inside the medium flow chamber. The valve body is provided with a first flow hole that cooperates with the valve core. The valve body corresponding to the medium flow chamber is also provided with a second flow hole.

5. The high-pressure resistant sealing valve as described in claim 4, characterized in that, The valve core is a cylindrical plug; or the outer surface of the valve core has a conical surface, a spherical surface, or a hemispherical surface, and the shape of the first flow hole matches the shape of the valve core.

6. The high-pressure resistant sealing valve as described in claim 1, characterized in that, The valve cover has an annular insert at the end for connection with the valve body. Correspondingly, the valve body has an annular slot that matches the insert at the end for connection with the valve cover. The insert of the valve cover is inserted into the slot of the valve body and is welded or bonded to the valve body.

7. The high-pressure resistant sealing valve as described in claim 6, characterized in that, The sealing assembly is used to connect to the valve body. The outer edge of the rigid support ring or flexible tension ring extends between the insert and the bottom groove surface of the slot, and its outer edge is fixed to the side groove surface of the slot.

8. The high-pressure resistant sealing valve as described in claim 1, characterized in that, The valve cover and valve body are detachably connected and fixed.

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