Ball valve with freely-lifted valve rod

Abstract

According to the ball valve with the freely-lifted valve rod, a rod channel comprises a small-diameter section and a large-diameter section which are connected with each other in the length direction, the valve rod penetrates through the rod channel to be circumferentially fixed to a valve ball body, and the valve rod and the valve ball body are in clearance fit in the height direction of a valve rod base; the valve rod is provided with a protruding frustum-shaped section corresponding to the cylindrical space, wherein the frustum-shaped section gradually shrinks in the direction of the valve ball body. According to the ball valve with the valve rod capable of being lifted freely, the packing is arranged between the cylindrical space and the frustum-shaped section in a compressed mode, the sealing packing gland presses the upper end of the frustum-shaped section downwards, therefore, the frustum-shaped section presses the packing downwards, the peripheral wall of the frustum-shaped section can complete the compression process, and the sealing packing achieves the better sealing effect. The sealing filler provides an upward fixing force for the valve rod while providing a sealing effect; the packing gland downwards presses the frustum-shaped section to provide downward fixing force for the valve rod, so that the valve rod is in clearance fit with the valve ball body, fixation of the valve rod cannot be interfered, and normal rotation of the valve ball body is achieved.

Description

Technical Field

[0001] The utility model relates to the field of valve structures, in particular to a ball valve with a freely lifting valve stem. Background Art

[0002] A ball valve is a common type of valve. Its basic structure mainly includes a valve body, a valve ball, and a valve stem. The valve body is the main part of the ball valve. It has a flow hole inside. The center line of the flow hole is aligned with the center line of the pipeline. The valve ball is the core component of the ball valve. It is usually a hollow spherical object that can rotate freely. When the hole of the valve ball is aligned with the flow hole of the valve body, the fluid can pass smoothly; when the valve ball is rotated so that the flow hole is misaligned, the flow of the fluid will be cut off.

[0003] The sealing method at the valve stem position is generally achieved through sealing packing, which is specifically achieved by fixing a packing gland to press the packing down, thereby achieving the sealing effect of the packing. The fixation of the valve stem is also achieved through the packing, and a release ring is set on the valve stem, and the packing presses the valve stem down on the valve ball. There are two problems in this process. First, the valve stem presses the valve ball down, which affects the sealing of the valve ball and also causes the valve ball to rotate; second, the packing gland only presses the packing from the upper end, so the deformation effect of the lower end of the packing is not large, and the sealing effect of the packing cannot be fully reflected. Utility Model Content

[0004] The main purpose of the utility model is to provide a ball valve with a freely lifting valve stem, aiming to solve the problem that the valve stem presses the valve ball downward, thereby affecting the sealing of the valve ball and causing the valve ball to rotate; the packing gland only presses the packing from the upper end, so that the deformation effect of the lower end of the packing is not large, and the sealing effect produced by the packing cannot be fully reflected.

[0005] In order to achieve the above object, the utility model provides a ball valve with a valve stem that can be lifted freely, comprising:

[0006] The valve body has a columnar channel running through the middle, the middle of the columnar channel in the length direction is a ball space, both ends of the columnar channel are joint ports, a valve stem seat is arranged on the outer wall of the valve body, a rod channel runs through the valve stem seat in the height direction, and the rod channel includes a small diameter section and a large diameter section connected to each other in the length direction, wherein the small diameter section is arranged near the valve body;

[0007] A packing gland is sleeve-shaped and installed in the valve stem seat, wherein the packing gland and the small diameter section are matched in the height direction of the valve stem seat to form a cylindrical space;

[0008] A valve ball body is arranged in the ball space;

[0009] The valve stem passes through the rod channel and forms a circumferential fixation with the valve sphere, and the valve stem and the valve sphere are in clearance fit in the height direction of the valve stem seat. The valve stem is provided with a frustum-shaped section that protrudes and tapers towards the valve sphere corresponding to the cylindrical space. The height dimension of the frustum-shaped section is smaller than the height dimension of the cylindrical space, and the packing gland presses down on the upper end of the frustum-shaped section;

[0010] The packing is compressively arranged between the cylindrical space and the frustum-shaped section;

[0011] Two connecting pipe joints are respectively detachably connected to the joint openings and clamp the valve sphere.

[0012] Further, a disc spring is compressively arranged between the frustum-shaped section and the packing gland.

[0013] Further, the disc spring is arranged to avoid the packing.

[0014] Further, a square groove structure is arranged at one end of the valve sphere near the valve stem, and a square shaft matching the square groove structure is arranged at one end of the valve stem near the valve sphere.

[0015] Further, a chamfer structure is arranged on the outer edge of the square groove structure.

[0016] Further, a protruding ring is arranged on the lower surface of the packing gland, and the protruding ring extends into the cylindrical space.

[0017] Further, the connection mode between the packing gland and the valve stem seat is flange connection.

[0018] Further, the valve sphere is an integrally formed structure.

[0019] Further, the valve stem is an integrally formed structure.

[0020] Further, the valve sphere and the valve stem are made of cemented carbide materials.

[0021] For the ball valve with free lifting of the valve stem provided by the present utility model, the packing is compressively arranged between the cylindrical space and the frustum-shaped section. The packing gland presses down on the upper end of the frustum-shaped section, so that the frustum-shaped section presses down into the packing. Moreover, the above pressing process does not only act on the uppermost end of the packing, but the outer peripheral wall of the frustum-shaped section can complete the compression process, so that the packing achieves a better sealing effect. And while the packing provides a sealing effect, it provides an upward fixing force for the valve stem; while the packing gland presses down on the frustum-shaped section to provide a downward fixing force for the valve stem, so that the clearance fit between the valve stem and the valve sphere will not interfere with the fixing of the valve stem, and the normal rotation of the valve sphere is realized. Description of the Drawings

[0022] Figure 1It is a schematic diagram of the valve body part in the ball valve with free lifting of the valve stem in the first embodiment of the present utility model;

[0023] Figure 2 It is a schematic cross-sectional view of the valve body part in the ball valve with free lifting of the valve stem in the first embodiment of the present utility model;

[0024] Figure 3 It is a schematic cross-sectional view of the ball valve with free lifting of the valve stem in the first embodiment of the present utility model;

[0025] Figure 4 It is Figure 3 a partial enlarged view of;

[0026] Figure 5 It is a schematic diagram of the valve stem in the ball valve with free lifting of the valve stem in the first embodiment of the present utility model;

[0027] Figure 6 It is an enlarged view of the valve ball in the ball valve with free lifting of the valve stem in the first embodiment of the present utility model.

[0028] The realization of the purpose, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0029] It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0030] Those skilled in the art of the present technology can understand that unless specifically stated, the singular forms "a", "an", "the", "above-mentioned" and "this" used herein may also include the plural forms. It should be further understood that the term "including" used in the description of the present utility model means the presence of the described features, integers, steps, operations, elements, units, modules and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, units, modules, components and / or groups thereof. It should be understood that when we say that an element is "connected" or "coupled" to another element, it can be directly connected or coupled to other elements, or there may also be intermediate elements. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The term "and / or" used herein includes all or any unit and all combinations of one or more related listed items.

[0031] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of those of ordinary skill in the technical field to which this utility model belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with their meaning in the context of the prior art, and will not be interpreted with an idealized or overly formal meaning unless specifically defined as herein.

[0032] Referring to Figures 1 to 6 , in an embodiment of the present utility model, a ball valve with a freely liftable valve stem includes:

[0033] A valve body portion 100, with a columnar channel 110 passing through the middle. The middle of the columnar channel 110 in the length direction is a spherical space. The two ends of the columnar channel 110 are respectively connection ports. A valve stem seat 120 is provided on the outer wall of the valve body portion 100. A rod channel penetrates through the valve stem seat 120 in the height direction. The rod channel includes a small-diameter section 121 and a large-diameter section 122 connected to each other in the length direction. Among them, the small-diameter section 121 is close to the valve body portion 100.

[0034] A packing gland 200, in a sleeve shape and installed in the valve stem seat 120. The packing gland 200 and the small-diameter section 121 form a cylindrical space in the height direction of the valve stem seat 120.

[0035] A valve ball 300, arranged in the spherical space.

[0036] A valve stem 400, passing through the rod channel and forming a circumferential fixation with the valve ball 300. And the valve stem 400 and the valve ball 300 are in clearance fit in the height direction of the valve stem seat 120. The valve stem 400 is provided with a protruding frustum-shaped section 410 that tapers towards the valve ball 300 corresponding to the cylindrical space. The height dimension of the frustum-shaped section 410 is smaller than the height dimension of the cylindrical space. The packing gland 200 presses down the upper end of the frustum-shaped section 410.

[0037] A sealing packing 500, compressed and arranged between the cylindrical space and the frustum-shaped section 410.

[0038] Two connecting pipe joints 600, respectively detachably connected to the connection ports to clamp the valve ball 300.

[0039] In the prior art, the valve stem presses down the valve ball, which not only affects the sealing of the valve ball but also makes the valve ball rotate; the packing gland only presses the packing from the upper end, so the deformation effect of the lower end of the packing is not significant, and thus the sealing effect produced by the packing cannot be fully reflected.

[0040] The ball valve with free lifting of the valve stem provided by the utility model has a columnar channel 110 passing through the middle of the valve main body 100. The middle of the columnar channel 110 in the length direction is a ball space. The two ends of the columnar channel 110 are respectively joint ports. A valve stem seat 120 is arranged on the outer wall of the valve main body 100. A rod channel penetrates through the valve stem seat 120 in the height direction. The rod channel includes a small-diameter section 121 and a large-diameter section 122 connected to each other in the length direction. The small-diameter section 121 is arranged near the valve main body 100, so that a step structure is formed between the small-diameter section 121 and the large-diameter section 122.

[0041] The packing gland 200 is in a sleeve shape and is installed in the valve stem seat 120. The packing gland 200 and the small-diameter section 121 are paired in the height direction of the valve stem seat 120 to form a cylindrical space. The cylindrical space is the installation space for the subsequent sealing packing 500.

[0042] The valve ball 300 is arranged in the ball space, and the control of fluid conduction is realized by the rotation of the valve ball 300.

[0043] The valve stem 400 passes through the rod channel and forms a circumferential fixation with the valve ball 300. Thus, during the rotation of the valve stem 400, the valve ball 300 can be driven to rotate. The circumferential limiting method between the valve stem 400 and the valve ball 300 is various. For example, a square groove structure 310 is arranged at one end of the valve ball 300 near the valve stem 400, and a square shaft 420 matching the square groove structure 310 is arranged at one end of the valve stem 400 near the valve ball 300, so that a circumferential limit can be formed between the square shaft 420 and the square groove structure 310. The valve stem 400 and the valve ball 300 are in clearance fit in the height direction of the valve stem seat 120, so that the valve stem 400 does not press the valve ball 300. The valve stem 400 is provided with a tapered section 410 protruding and tapering towards the valve ball 300 corresponding to the cylindrical space, and the sealing packing 500 is compressed by the tapered section 410. The height dimension of the tapered section 410 is smaller than the height dimension of the cylindrical space, so that the tapered section 410 of the valve stem 400 does not abut against the large-diameter section 122, and further the action of the tapered section 410 of the valve stem 400 on the subsequent sealing packing 500 will not be accidentally interfered.

[0044] The sealing packing 500 is compressively arranged between the cylindrical space and the frustum-shaped section 410. The packing gland 200 presses down the upper end of the frustum-shaped section 410, so that the frustum-shaped section 410 presses down into the sealing packing 500. Moreover, the above pressing process does not only act on the uppermost end of the sealing packing 500. The outer peripheral wall of the frustum-shaped section 410 can complete the compression process, so that the sealing packing 500 achieves a better sealing effect. And while the sealing packing 500 provides a sealing effect, it provides an upward fixing force for the valve stem 400; and the packing gland 200 pressing down the frustum-shaped section 410 provides a downward fixing force for the valve stem 400, so that the clearance fit between the valve stem 400 and the valve ball 300 will not interfere with the fixing of the valve stem 400, and the normal rotation of the valve ball 300 is realized.

[0045] Two connecting pipe joints 600 are respectively detachably connected to the joint ports to clamp the valve ball 300. Soft seals and / or hard seals can be provided on the connecting pipe joints 600 to achieve the sealing effect between the connecting pipe joints 600 and the valve ball 300.

[0046] In summary, the sealing packing 500 is compressively arranged between the cylindrical space and the frustum-shaped section 410. The packing gland 200 presses down the upper end of the frustum-shaped section 410, so that the frustum-shaped section 410 presses down into the sealing packing 500. Moreover, the above pressing process does not only act on the uppermost end of the sealing packing 500. The outer peripheral wall of the frustum-shaped section 410 can complete the compression process, so that the sealing packing 500 achieves a better sealing effect. And while the sealing packing 500 provides a sealing effect, it provides an upward fixing force for the valve stem 400; and the packing gland 200 pressing down the frustum-shaped section 410 provides a downward fixing force for the valve stem 400, so that the clearance fit between the valve stem 400 and the valve ball 300 will not interfere with the fixing of the valve stem 400, and the normal rotation of the valve ball 300 is realized.

[0047] Refer to Figures 3 to 4 In one embodiment, a disc spring 210 is compressively arranged between the frustum-shaped section 410 and the packing gland 200.

[0048] In this embodiment, considering that the sealing packing 500 provides an upward fixing force for the valve stem 400 and the packing gland 200 provides a downward fixing force for the valve stem 400, the contact situation between the packing gland 200 and the frustum-shaped section 410 may be abnormal (no contact is formed); the presence of the disc spring 210 ensures the contact between the packing gland 200 and the frustum-shaped section 410.

[0049] Refer to Figures 3 to 4 In one embodiment, the disc spring 210 is arranged to avoid the sealing packing 500.

[0050] In this embodiment, to prevent the sealing packing 500 from affecting the operation of the disc spring 210 and to prevent the disc spring 210 from affecting the compression of the sealing packing 500 by the packing gland 200, the disc spring 210 is arranged to avoid the sealing packing 500, so that the above two aspects of work will not be negatively affected.

[0051] Referring to Figures 3 to 4 , in one embodiment, a square groove structure 310 is provided at one end of the valve ball 300 close to the valve stem 400, and a square shaft 420 matching the square groove structure 310 is provided at one end of the valve stem 400 close to the valve ball 300.

[0052] In this embodiment, a relatively simple structure is given, which can be stably realized through the cooperation of the square shaft 420 and the square groove structure 310. At the same time, it is easier to form a clearance fit between the square shaft 420 and the square groove structure 310 in the height direction, and the square shaft 420 does not touch the bottom of the square groove structure 310.

[0053] Referring to Figure 6 , in one embodiment, a chamfer structure is provided on the outer edge of the square groove structure 310.

[0054] In this embodiment, through the chamfer structure of the square groove structure 310 on the valve ball 300, the installation of the square shaft 420 is guided. During the installation of the square shaft 420, the position of the valve ball 300 can also be corrected to the correct position, thereby reducing the installation difficulty of the valve ball 300.

[0055] Referring to Figures 3 to 4 , in one embodiment, a protruding ring 220 is provided on the lower surface of the packing gland 200, and the protruding ring 220 extends into the cylindrical space.

[0056] In this embodiment, through the arrangement of the protruding ring 220, the downward pressure provided by the packing gland 200 can act on the sealing packing 500 to a greater extent, thereby improving the sealing effect of the sealing packing 500. The height dimension of the protruding ring 220 should not be too large, and it should be able to complete the pressing of the sealing packing 500, so as to improve the filling amount of the sealing packing 500 as much as possible.

[0057] In one embodiment, the connection mode between the packing gland 200 and the valve stem seat 120 is flange connection.

[0058] In this embodiment, the packing gland 200 and the valve stem seat 120 are flange-connected by multiple groups of bolts, which has the advantages of stability and reliability. In specific implementation, the number of bolts can be 4, 6 or 8, etc. In other embodiments, the connection mode of the packing gland 200 can also be threaded connection, etc.

[0059] In one embodiment, the valve ball 300 is an integrally formed structure.

[0060] In this embodiment, the valve ball 300 is defined as an integrally formed structure, which improves the structural strength and reduces the difficulty of installation and disassembly; the specific integrally formed method can be casting or machining center, etc. The material of the valve ball 300 can be metal or polymer.

[0061] In one embodiment, the valve stem 400 is an integrally formed structure.

[0062] In this embodiment, the valve stem 400 is defined as an integrally formed structure, which improves the structural strength and reduces the difficulty of installation and disassembly; the specific integrally formed method can be casting or machining center, etc. The material of the valve stem 400 can be metal or polymer.

[0063] In one embodiment, the valve ball 300 and the valve stem 400 are made of cemented carbide.

[0064] In this embodiment, by improving the structural strength of the valve ball 300 and the valve stem 400, the structural strength at the joint position of the two is improved. Specifically, which alloy steel is selected for the materials of the two is selected according to the actual use scenario.

[0065] In summary, for the ball valve with free lifting of the valve stem provided by the present utility model, the sealing packing 500 is compressively arranged between the cylindrical space and the frustum-shaped section 410. The packing gland 200 presses down the upper end of the frustum-shaped section 410, so that the frustum-shaped section 410 presses down into the sealing packing 500, and the above pressing process does not only act on the uppermost end of the sealing packing 500, but the outer peripheral wall of the frustum-shaped section 410 can complete the compression process, so that the sealing packing 500 achieves a better sealing effect. And while the sealing packing 500 provides a sealing effect, it provides an upward fixing force for the valve stem 400; and the packing gland 200 pressing down the frustum-shaped section 410 provides a downward fixing force for the valve stem 400, so that the clearance fit between the valve stem 400 and the valve ball 300 will not interfere with the fixing of the valve stem 400, and the normal rotation of the valve ball 300 is realized.

[0066] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structure or equivalent process transformation made by using the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. A ball valve with free lifting of the valve stem, characterized in that Comprising: A valve main body (100) with a columnar channel (110) running through the middle. The middle part in the length direction of the columnar channel (110) is a spherical space, and both ends of the columnar channel (110) are joint ports. A valve stem seat (120) is provided on the outer wall of the valve main body (100). A rod channel runs through the valve stem seat (120) in the height direction, and the rod channel includes a small-diameter section (121) and a large-diameter section (122) connected to each other in the length direction. Among them, the small-diameter section (121) is arranged near the valve main body (100); A packing gland (200), which is in a sleeve shape and installed in the valve stem seat (120). The packing gland (200) and the small-diameter section (121) form a cylindrical space in the height direction of the valve stem seat (120); A valve sphere (300), which is arranged in the spherical space; A valve stem (400), which passes through the rod channel and is circumferentially fixed to the valve sphere (300). And the valve stem (400) and the valve sphere (300) are in clearance fit in the height direction of the valve stem seat (120). The valve stem (400) is provided with a frustum-shaped section (410) that protrudes and tapers towards the valve sphere (300). The height dimension of the frustum-shaped section (410) is smaller than the height dimension of the cylindrical space, and the packing gland (200) presses down the upper end of the frustum-shaped section (410); Sealing packing (500), which is compressively arranged between the cylindrical space and the frustum-shaped section (410); Two connecting pipe joints (600), which are respectively detachably connected to the joint ports to clamp the valve sphere (300).

2. The ball valve with free lifting of the valve stem according to claim 1, characterized in that, A disc spring (210) is compressively arranged between the frustum-shaped section (410) and the packing gland (200).

3. The ball valve with free lifting valve stem according to claim 2, characterized in that, The disc spring (210) is arranged to avoid the sealing packing (500).

4. The ball valve with free lifting of the valve stem according to claim 1, characterized in that, A square groove structure (310) is provided at one end of the valve sphere (300) near the valve stem (400), and a square shaft (420) matching the square groove structure (310) is provided at one end of the valve stem (400) near the valve sphere (300).

5. The ball valve with free lifting of the valve stem according to claim 4, characterized in that, A chamfer structure is provided on the outer edge of the square groove structure (310).

6. The ball valve with free lifting of the valve stem according to claim 1, characterized in that, A protruding ring (220) is provided on the lower surface of the packing gland (200), and the protruding ring (220) extends into the cylindrical space.

7. The ball valve with free lifting of the valve stem according to any one of claims 1 to 6, characterized in that, The connection mode between the packing gland (200) and the valve stem seat (120) is flange connection.

8. The ball valve with free lifting of the valve stem according to any one of claims 1 to 6, characterized in that, The valve sphere (300) is an integrally formed structure.

9. The ball valve with free lifting of the valve stem according to claim 8, characterized in that, The valve stem (400) is an integrally formed structure.

10. The ball valve with free lifting valve stem according to claim 9, characterized in that, The valve sphere (300) and the valve stem (400) are made of cemented carbide materials.

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