Low-leakage environmentally friendly regulating valve

Abstract

The utility model discloses a kind of low-leakage environmental protection regulating valves, including valve body assembly, valve stem, valve core and first sealing structure, valve body assembly is equipped with input channel, output channel, connecting channel and middle shaft channel, input channel and output channel are communicated by connecting channel, connecting channel is located below middle shaft channel, valve stem is worn middle shaft channel and can be relatively valve body assembly up and down mobile, valve core is connected in the lower end of valve stem and is set correspondingly connecting channel, first sealing structure includes packing pressure sleeve, sealing packing, packing pad sleeve and compression spring, sealing packing is located between the outer wall of valve stem and the inner wall of middle shaft channel, packing pressure sleeve is located on the upside of sealing packing, packing pad sleeve is located on the downside of sealing packing and cooperates with packing pressure sleeve and is clamped sealing packing, compression spring is located on the downside of packing pad sleeve and acts on packing pad sleeve. The utility model can make valve body assembly and valve stem between better sealing effect, reduce the possibility of leakage at middle shaft channel.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a low-leakage environmentally friendly regulating valve. Background Technology

[0002] A control valve is a valve used to regulate and change the flow parameters of a medium. A typical control valve usually includes components such as a valve body, valve core, and valve stem. The valve body has an input channel and an output channel, which are connected through a connection port. The valve stem is movably inserted into the valve body and connected to the valve core. The axial movement of the valve stem causes the valve core to move up and down, thereby sealing or adjusting the opening of the connection port to regulate and change the flow parameters of the medium. Some existing control valves employ simplified sealing structures with low reliability, especially under long-term operation or fluctuating operating conditions, making them prone to medium leakage. This not only leads to medium loss but may also cause environmental pollution. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a low-leakage, environmentally friendly regulating valve. It uses a packing sleeve and a packing gasket to clamp and compress the sealing packing, and utilizes a compression spring to maintain the applied compressive force on the sealing packing. This achieves a better seal between the outer wall of the valve stem and the inner wall of the central channel, ensuring a stable and reliable sealing effect, reducing the possibility of leakage at the central channel, and avoiding environmental pollution.

[0004] According to an embodiment of this utility model, a low-leakage environmentally friendly regulating valve includes a valve body assembly, a valve stem, a valve core, and a first sealing structure. The valve body assembly has an input channel, an output channel, a connecting channel, and a central axis channel. The input channel and the output channel are connected through the connecting channel, which is located below the central axis channel. The valve stem passes through the central axis channel and can move up and down relative to the valve body assembly. The valve core is connected to the lower end of the valve stem and is positioned corresponding to the connecting channel. The first sealing structure includes a packing sleeve, sealing packing, a packing pad, and a compression spring. The sealing packing is disposed between the outer wall of the valve stem and the inner wall of the central axis channel. The packing sleeve is disposed on the upper side of the sealing packing. The packing pad is disposed on the lower side of the sealing packing and cooperates with the packing sleeve to clamp the sealing packing. The compression spring is disposed on the lower side of the packing pad and acts on the packing pad.

[0005] According to the embodiments of this utility model, the low-leakage environmentally friendly regulating valve has at least the following beneficial effects: In use, by driving the valve stem to move up and down along the central axis channel, the valve core moves. The valve core cooperates with the connecting channel to close the connecting channel or adjust the opening of the connecting channel, thereby adjusting and changing the medium flow parameters. Since a sealing packing is provided between the outer wall of the valve stem and the inner wall of the central axis channel, the packing sleeve and the packing gasket are located on the upper and lower sides of the sealing packing respectively and cooperate to clamp the sealing packing. The sealing packing is squeezed to make its inner diameter shrink and its outer diameter expand, so as to seal the outer wall of the valve stem and the inner wall of the central axis channel. In addition, the compression spring is located on the lower side of the packing gasket and acts on the packing gasket to maintain the applied compressive force on the sealing packing, which can further enhance the sealing effect, which is conducive to ensuring the stable and reliable sealing between the valve body assembly and the valve stem, reducing the possibility of leakage at the central axis channel, and avoiding environmental pollution.

[0006] According to some embodiments of the present invention, the sealing packing includes a first packing ring, the valve stem passes through the first packing ring, the inner and outer sides of the first packing ring are both inclined downwards so that the cross-sectional shape of the first packing ring is an inverted "V" shape on one side, and multiple first packing rings are provided and stacked along the axial direction of the valve stem.

[0007] According to some embodiments of the present invention, the lower side of the first packing ring is provided with an annular groove with an opening facing downward, and the annular groove is located between the inner side and the outer side of the first packing ring.

[0008] According to some embodiments of the present invention, the inner side of the first packing ring is provided with a first mating surface corresponding to the outer wall of the valve stem, and the first mating surface is a conical structure with a diameter that gradually decreases from top to bottom.

[0009] According to some embodiments of the present invention, a second mating surface is provided on the outer side of the first packing ring corresponding to the inner wall of the central channel, and the second mating surface is a conical structure with a diameter that gradually increases from top to bottom.

[0010] According to some embodiments of the present invention, the first sealing structure further includes a pressure cap, which is connected to the valve body assembly via a threaded structure and abuts against the upper side of the packing sleeve. The inner wall of the central channel is provided with an inner flange formed by radial contraction, and the two ends of the compression spring act on the packing sleeve and the inner flange, respectively.

[0011] According to some embodiments of the present invention, a dust cover is provided on the upper side of the packing sleeve. The dust cover is located inside the ring of the packing sleeve and can cover the gap between the packing sleeve and the valve stem.

[0012] According to some embodiments of the present invention, a first sealing ring is provided between the inner side of the packing sleeve and the outer wall of the valve stem, and between the outer side of the packing sleeve and the inner wall of the central shaft channel.

[0013] According to some embodiments of this utility model, the low-leakage environmentally friendly regulating valve further includes a second sealing structure, the second sealing structure including an annular valve seat, the annular valve seat being disposed on the side of the connecting channel opposite to the output channel, and the valve core being able to abut against the annular valve seat to disconnect the connection between the input channel and the output channel.

[0014] According to some embodiments of the present invention, the second sealing structure further includes a valve seat sleeve and a second sealing ring. The second sealing ring is disposed on the lower side of the annular valve seat and sandwiched between the annular valve seat and the valve body assembly. The valve seat sleeve is disposed on the upper side of the annular valve seat and abuts against the annular valve seat. The upper side of the valve seat sleeve abuts against the valve body assembly.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of the low-leakage environmentally friendly regulating valve according to an embodiment of this utility model; Figure 2 for Figure 1 Exploded view of the structure of a low-to-medium leakage environmentally friendly control valve; Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of a medium-low leakage environmentally friendly control valve; Figure 4 for Figure 3 An enlarged schematic diagram of part A in the middle; Figure 5 for Figure 3 Enlarged schematic diagram of part B in the middle; Figure 6 for Figure 5 An enlarged schematic diagram of section C.

[0017] Figure label: Valve body assembly 100, input channel 101, output channel 102, connection channel 103, central shaft channel 104, valve body 110, valve cover 120, inner flange 121; Valve stem 210, valve core 220; Annular groove 301, first mating surface 302, second mating surface 303, packing sleeve 310, dust cover 311, first sealing ring 312, sealing packing 330, first packing ring 331, second packing ring 332, third packing ring 333, packing gasket 340, compression spring 350, gland 360; Annular valve seat 410, valve seat pressure sleeve 420, second sealing ring 430. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, it should be understood that if directional descriptions are involved, such as up, down, front, back, left, right, etc., indicating the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings, it is only for the convenience of describing this utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0020] In the description of this utility model, if words such as several, greater than, less than, exceeding, above, below, or within appear, several means one or more, multiple means two or more, greater than, less than, exceeding, etc. are understood to exclude the number itself, and above, below, or within are understood to include the number itself.

[0021] If the terms "first" and "second" are used only to distinguish technical features, they should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0022] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0023] Reference Figure 1 , Figure 2 and Figure 3A low-leakage, environmentally friendly regulating valve includes a valve body assembly 100, a valve stem 210, a valve core 220, and a first sealing structure. The valve body assembly 100 has an input channel 101, an output channel 102, a connecting channel 103, and a central axis channel 104. The input channel 101 and the output channel 102 are connected by the connecting channel 103, which is located below the central axis channel 104. The valve stem 210 passes through the central axis channel 104 and can move up and down relative to the valve body assembly 100. The valve core 220 is connected to the valve stem 210. The lower end is connected to the channel 103. The first sealing structure includes a packing sleeve 310, a sealing packing 330, a packing pad 340, and a compression spring 350. The sealing packing 330 is located between the outer wall of the valve stem 210 and the inner wall of the central shaft channel 104. The packing sleeve 310 is located on the upper side of the sealing packing 330. The packing pad 340 is located on the lower side of the sealing packing 330 and cooperates with the packing sleeve 310 to clamp the sealing packing 330. The compression spring 350 is located on the lower side of the packing pad 340 and acts on the packing pad 340.

[0024] Understandably, such as Figure 1 , Figure 2 and Figure 3As shown, the valve body assembly 100 includes a valve body 110 and a valve cover 120. The valve cover 120 is connected to the upper side of the valve body 110. The input channel 101, the output channel 102, and the connecting channel 103 are all located in the valve body 110. The central axis channel 104 is located in the valve cover 120 and runs vertically through it. The sealing packing 330, the packing sleeve 340, and the compression spring 350 are all located in the central axis channel 104. The packing pressure sleeve 310 is located on the upper side of the valve cover 120 and its lower part is inserted into the central axis channel 104. The valve stem 210 passes through the central axis channel 104 and also passes through the packing pressure sleeve 310, the sealing packing 330, the packing sleeve 340, and the compression spring 350. The valve core 220 is connected to the lower end of the valve stem 210 and is correspondingly connected to the connecting channel 103. In use, the valve stem 210 is driven to move up and down along the central channel 104, thereby moving the valve core 220. The valve core 220 cooperates with the connecting channel 103 to close the connecting channel 103 or adjust its opening, thus regulating and changing the medium flow parameters. Since a sealing packing 330 is provided between the outer wall of the valve stem 210 and the inner wall of the central channel 104, the packing sleeve 310 and the packing gasket 340 are located on the upper and lower sides of the sealing packing 330 respectively, and cooperate to clamp the sealing packing 330. The compression sealing packing 330 is compressed to reduce its inner diameter and expand its outer diameter, thereby sealing the outer wall of the valve stem 210 and the inner wall of the central channel 104. Furthermore, the compression spring 350 is located on the lower side of the packing sleeve 340 and acts on the packing sleeve 340 to maintain the applied compression force on the sealing packing 330, which can further enhance the sealing effect. This helps to ensure a stable and reliable seal between the valve body assembly 100 and the valve stem 210, reduces the possibility of leakage at the central channel 104, and avoids environmental pollution.

[0025] In practical applications, the specific structures of the valve body assembly 100, valve stem 210, and valve core 220 can be set according to actual usage requirements.

[0026] In some embodiments, the sealing packing 330 includes a first packing ring 331, through which the valve stem 210 passes. The inner and outer sides of the first packing ring 331 are both inclined downwards, so that the cross-sectional shape of the first packing ring 331 is an inverted "V" shape on one side. The first packing ring 331 is provided in multiple layers and stacked along the axial direction of the valve stem 210.

[0027] Understandably, such as Figure 3 , Figure 5 and Figure 6As shown, the sealing packing 330 also includes a second packing ring 332 and a third packing ring 333. A first packing ring 331 is sandwiched between the second packing ring 332 and the third packing ring 333, and multiple first packing rings 331 are provided. Multiple first packing rings 331 are stacked along the axial direction of the valve stem 210. The inner side of the first packing ring 331 is inclined downward, forming an inverted frustum structure, and the outer side of the first packing ring 331 is inclined downward, forming a frustum structure. This makes the shape of one side (left or right side in the figure) of the longitudinal section of the first packing ring 331 inverted "V" shape. Under the clamping and squeezing of the packing sleeve 310 and the packing gasket 340, the inverted "V" shape formed by the inner and outer sides of the first packing ring 331 will deform and open, causing the inner diameter to shrink and the outer diameter to increase. This strengthens the contact effect with the outer wall of the valve stem 210 and the inner wall of the central channel 104. The inverted "V" shape will also hinder the leakage of the medium from bottom to top, similar to the structure of a venous valve, further reducing the possibility of medium leakage and improving the sealing reliability.

[0028] In practical applications, the material of the packing ring can be PTFE, TFM4215 (tetrafluoroethylene material), etc. The first packing ring 331, the second packing ring 332 and the third packing ring 333 can all be made of the same material, or different materials can be used respectively, or different materials can be used alternately. The specific settings of the first packing ring 331, the second packing ring 332 and the third packing ring 333 can be made according to the actual needs of the application.

[0029] In some embodiments, the lower side of the first packing ring 331 is provided with an annular groove 301 with the opening facing downward, and the annular groove 301 is located between the inner side and the outer side of the first packing ring 331.

[0030] Understandably, such as Figure 3 , Figure 5 and Figure 6 As shown, by providing an annular groove 301 on the lower side of the first packing ring 331, with the opening of the annular groove 301 facing downwards and located between the inner and outer sides of the first packing ring 331, the inverted "V" shaped structure formed by the inner and outer sides of the first packing ring 331 will deform and open, facilitating a better sealing effect. In practical applications, the annular groove 301 can be set according to actual usage requirements.

[0031] In some embodiments, the inner side of the first packing ring 331 is provided with a first mating surface 302 corresponding to the outer wall of the valve stem 210. The first mating surface 302 is a conical structure with a diameter that gradually decreases from top to bottom.

[0032] Understandably, such as Figure 3 , Figure 5 and Figure 6As shown, the inner side of the first packing ring 331 corresponding to the outer wall of the valve stem 210 is the first mating surface 302. The first mating surface 302 is a conical structure with a diameter that gradually decreases from top to bottom. This increases the compression between the inner side of the first packing ring 331 and the outer wall of the valve stem 210, and enhances the resistance to upward leakage of the medium, further improving the sealing performance. In practical applications, the specific taper of the first mating surface 302 can be set according to actual usage requirements.

[0033] In some embodiments, a second mating surface 303 is provided on the outer side of the first packing ring 331 corresponding to the inner wall of the central channel 104. The second mating surface 303 is a conical structure with a diameter that gradually increases from top to bottom.

[0034] Understandably, such as Figure 3 , Figure 5 and Figure 6 As shown, the outer surface of the first packing ring 331 corresponding to the inner wall of the central channel 104 is the second mating surface 303. The second mating surface 303 is a conical structure with a diameter that gradually increases from top to bottom. This increases the pressure between the outer surface of the first packing ring 331 and the inner wall of the central channel 104, and enhances the resistance to upward leakage of the medium, further improving the sealing performance. In practical applications, the specific taper of the second mating surface 303 can be set according to actual usage requirements.

[0035] In some embodiments, the first sealing structure further includes a gland 360, which is connected to the valve body assembly 100 via a threaded structure and abuts against the upper side of the packing sleeve 310. The inner wall of the central channel 104 is provided with an inner flange 121 formed by radial contraction. The two ends of the compression spring 350 act on the packing sleeve 340 and the inner flange 121, respectively.

[0036] Understandably, such as Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the gland 360 is fixedly connected to the valve cover 120 by bolts or studs. It is located on the upper side of the packing sleeve 310 and abuts against the packing sleeve 310, causing the packing sleeve 310 to press the sealing packing 330 downward. The inner flange 121 is located on the inner wall of the central shaft channel 104 and below the compression spring 350. The two ends of the compression spring 350 act on the packing gasket 340 and the inner flange 121 respectively, so as to maintain an upward pressure on the sealing packing 330 through the packing gasket 340. Its structure is simple and convenient for production, assembly and use. In practical applications, in addition to setting the gland 360, the packing sleeve 310 can also be directly connected to the valve cover 120, such as through a threaded connection structure. The specific connection can be changed according to the actual use requirements.

[0037] In some embodiments, a dust cover 311 is provided on the upper side of the packing sleeve 310. The dust cover 311 is located inside the ring of the packing sleeve 310 and can cover the gap between the packing sleeve 310 and the valve stem 210.

[0038] Understandably, such as Figure 2 , Figure 3 and Figure 5 As shown, the dust cover 311 is located on the upper side of the inner ring of the packing sleeve 310. The dust cover 311 blocks the gap between the packing sleeve 310 and the valve stem 210, reducing the possibility of dust and foreign objects entering between the inner ring of the packing sleeve 310 and the outer wall of the valve stem 210, thus preventing impact on the sealing portion below and improving sealing reliability. In practical applications, the dust cover 311 can be adjusted according to actual usage requirements.

[0039] In some embodiments, a first sealing ring 312 is provided between the inner side of the packing sleeve 310 and the outer wall of the valve stem 210, and between the outer side of the packing sleeve 310 and the inner wall of the central channel 104.

[0040] Understandably, such as Figure 2 , Figure 3 and Figure 5 As shown, the inner side of the packing sleeve 310 is provided with two first sealing rings 312 spaced apart vertically, used to seal the gap between the inner side of the packing sleeve 310 and the outer wall of the valve stem 210. The outer side of the packing sleeve 310 is provided with a first sealing ring 312, used to seal the gap between the outer side of the packing sleeve 310 and the inner wall of the central shaft channel 104. This structure adds an extra layer of sealing above the packing 330, further improving sealing performance and reliability, and facilitating use. In practical applications, the specific first sealing ring 312 can be set according to actual usage requirements.

[0041] In some embodiments, the low-leakage environmentally friendly regulating valve further includes a second sealing structure, which includes an annular valve seat 410. The annular valve seat 410 is disposed on the side of the connecting channel 103 opposite to the output channel 102. The valve core 220 can abut against the annular valve seat 410 to disconnect the connection between the input channel 101 and the output channel 102.

[0042] Understandably, such as Figure 2 , Figure 3 and Figure 4As shown, the annular valve seat 410 is located on the upper side of the connecting channel 103. When it is necessary to disconnect the connection between the input channel 101 and the output channel 102, the valve core 220 abuts against the annular valve seat 410, sealing the upper side of the connecting channel 103. By setting the annular valve seat 410, the sealing performance of the valve core 220 in the closed state of the regulating valve is improved, making it easier to use. In practical applications, the annular valve seat 410 can be set according to actual usage needs.

[0043] In some embodiments, the second sealing structure further includes a valve seat sleeve 420 and a second sealing ring 430. The second sealing ring 430 is disposed on the lower side of the annular valve seat 410 and sandwiched between the annular valve seat 410 and the valve body assembly 100. The valve seat sleeve 420 is disposed on the upper side of the annular valve seat 410 and abuts against the annular valve seat 410. The upper side of the valve seat sleeve 420 abuts against the valve body assembly 100.

[0044] Understandably, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the valve seat sleeve 420 has a cage-like structure and is located on the upper side of the annular valve seat 410. The second sealing ring 430 is located on the lower side of the annular valve seat 410 and sandwiched between the annular valve seat 410 and the valve body 110. When the valve cover 120 is connected to the valve body 110, the valve cover 120 abuts against the upper side of the valve seat sleeve 420, thereby applying pressure to the annular valve seat 410 through the valve seat sleeve 420. This causes the annular valve seat 410 and the valve body 110 to compress the second sealing ring 430, thereby sealing the mating gap between the annular valve seat 410 and the valve body 110, improving the sealing performance at the annular valve seat 410, and facilitating use. In practical applications, the valve seat sleeve 420 and the second sealing ring 430 can be set according to actual usage requirements.

[0045] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A low-leakage environmentally friendly regulating valve, characterized in that, include: A valve body assembly, the valve body assembly having an input channel, an output channel, a connecting channel and a central axis channel, the input channel and the output channel being connected through the connecting channel, the connecting channel being located below the central axis channel; A valve stem, which passes through the central channel and is movable up and down relative to the valve body assembly; A valve core, which is connected to the lower end of the valve stem and is configured corresponding to the connection channel; The first sealing structure includes a packing sleeve, a sealing packing, a packing gasket, and a compression spring. The sealing packing is disposed between the outer wall of the valve stem and the inner wall of the central shaft channel. The packing sleeve is disposed on the upper side of the sealing packing. The packing gasket is disposed on the lower side of the sealing packing and cooperates with the packing sleeve to clamp the sealing packing. The compression spring is disposed on the lower side of the packing gasket and acts on the packing gasket.

2. The low-leakage environmentally friendly control valve according to claim 1, wherein, The sealing packing includes a first packing ring, through which the valve stem passes. The inner and outer sides of the first packing ring are inclined downwards, so that the cross-sectional shape of the first packing ring is an inverted "V" shape on one side. Multiple first packing rings are provided and stacked along the axial direction of the valve stem.

3. The low-leakage environmentally friendly control valve of claim 2, wherein, The lower side of the first packing ring is provided with an annular groove with an opening facing downwards, and the annular groove is located between the inner side and the outer side of the first packing ring.

4. The low-leakage environmentally friendly regulating valve according to claim 2, characterized in that, The inner side of the first packing ring is provided with a first mating surface corresponding to the outer wall of the valve stem. The first mating surface is a conical structure with a diameter that gradually decreases from top to bottom.

5. The low-leakage environmentally friendly control valve of claim 2, wherein, The outer side of the first packing ring is provided with a second mating surface corresponding to the inner wall of the central channel. The second mating surface is a conical structure with a diameter that gradually increases from top to bottom.

6. The low-leakage environmentally friendly control valve of claim 1, wherein, The first sealing structure further includes a gland, which is connected to the valve body assembly via a threaded structure and abuts against the upper side of the packing sleeve. The inner wall of the central channel is provided with an inner flange formed by radial contraction. The two ends of the compression spring act on the packing sleeve and the inner flange, respectively.

7. The low-leakage environmentally friendly control valve of claim 1, wherein, A dust cover is provided on the upper side of the packing sleeve. The dust cover is located inside the ring of the packing sleeve and can cover the gap between the packing sleeve and the valve stem.

8. The low-leakage environmentally friendly control valve of claim 1, wherein, A first sealing ring is provided between the inner side of the packing sleeve and the outer wall of the valve stem, and between the outer side of the packing sleeve and the inner wall of the central shaft channel.

9. The low-leakage environmentally friendly control valve of claim 1, wherein, It also includes a second sealing structure, which includes an annular valve seat located on the side of the connecting channel opposite to the output channel. The valve core can abut against the annular valve seat to disconnect the connection between the input channel and the output channel.

10. The low-leakage environmentally friendly control valve of claim 9, wherein, The second sealing structure further includes a valve seat sleeve and a second sealing ring. The second sealing ring is disposed on the lower side of the annular valve seat and sandwiched between the annular valve seat and the valve body assembly. The valve seat sleeve is disposed on the upper side of the annular valve seat and abuts against the annular valve seat. The upper side of the valve seat sleeve abuts against the valve body assembly.

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