Multi-combination sealing buried butterfly valve for heat supply

Abstract

The invention discloses a multi-combination sealing buried butterfly valve for heat supply, and relates to the technical field of buried butterfly valves. The valve comprises a valve body, the vertical plane of the valve body is inclined by 45 degrees and installed on a horizontal pipeline, a valve body sealing piece is installed on the inner wall of the valve body, a valve rod is rotationally installed in the valve body, a valve plate assembly is fixedly installed on the valve rod, and the valve plate assembly comprises an outer valve ring fixedly installed on the valve rod; a valve plate sealing piece is installed on the outer side of the outer valve ring, and an inner valve plate is rotationally installed in the outer valve ring in a sealed mode. The valve is designed to be obliquely installed at the angle of 45 degrees, when the valve is closed, the valve plate assembly can push away impurities accumulated at the sealing position of the valve body, and part of long-strip-shaped impurities hung on the valve body sealing piece and particle impurities accumulated on the valve body sealing piece can be scraped away by a shearing position formed by the valve body sealing piece and the valve plate sealing piece; therefore, the sealing performance is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of buried butterfly valves, and particularly to a multiple combined sealed buried butterfly valve for heat supply. Background Art

[0002] With the development of urban heat supply, the construction of long-distance pipelines in the urban heat supply field has developed rapidly in recent years. Due to design reasons such as maintenance and pressure boosting, the installation spacing of valves in long-distance pipelines is relatively long (usually one group every 1-2 kilometers), and the conveying line is long, crossing many cultivated lands without power supply. If power supply is assumed along with the long-distance pipeline, it involves the maintenance and repair of the circuit, increasing the operating cost. Therefore, most domestic heat supply long-distance pipelines currently still use manual valves.

[0003] Since long-distance pipelines are all buried (that is, the cultivated land, roads, etc. are dug open before construction, and then backfilled and restored after the pipeline is laid), in order to facilitate the installation of valves and subsequent maintenance, valve wells need to be built. In order to reduce the impact on the environment, valve wells usually have 2-4 inspection holes reserved. When the valve needs to be opened or closed, the inspection hole is opened for ventilation, and then personnel go down to operate the valve or conduct inspections, maintenance, repair and other operations on the valve. At the same time, due to the relatively large amount of impurities in the heat supply medium (hot water), the impurities are easily accumulated at the lower part of the valve stem inside the valve, and the impurities are easily introduced between the valve plate and the valve body seal, resulting in wear of the seal, and thus accelerating the aging of the valve. This not only reduces the service life of the valve, but also may cause leakage problems, affecting the sealing performance and stability of the entire system. Summary of the Invention

[0004] The purpose of the present invention is to provide a multiple combined sealed buried butterfly valve for heat supply to solve the above problems.

[0005] The present invention specifically adopts the following technical solutions to achieve the above purpose: A multiple combined sealed buried butterfly valve for heat supply, comprising a valve body, the valve body is installed on a horizontal pipeline at an inclination of 45° in the vertical plane, a valve body seal is installed on the inner wall of the valve body, a valve stem is rotatably installed inside the valve body, a valve plate assembly is fixedly installed on the valve stem, the valve plate assembly includes an outer valve ring fixedly installed on the valve stem, a valve plate seal is installed on the outer side of the outer valve ring, the inner wall of the outer valve ring is designed as an arc, and an inner valve plate is rotatably installed inside the outer valve ring in a sealed manner, and the rotation axis of the inner valve plate is perpendicular to the axis of the valve stem; A gearbox is fixedly installed on the top of the valve body, an extended metal cylinder is fixedly installed on the outside of the gearbox, a driving rod is rotatably installed inside the extended metal cylinder, and the driving rod can drive the valve stem to rotate through the gearbox.

[0006] Further, a self-lubricating bearing is provided between the valve body and the valve stem.

[0007] Furthermore, a low-leakage filler is arranged between the valve body and the valve stem, and the low-leakage filler is located above the self-lubricating bearing.

[0008] Furthermore, two groups of sealing rings are arranged between the valve body and the valve stem, and the two groups of sealing rings are located above the low-leakage packing.

[0009] Furthermore, a worm wheel and a worm are rotatably installed inside the gear box, the worm wheel is fixedly installed on the valve stem, the drive rod is connected to the worm gear through a bevel gear, and the angle between the extended metal tube and the valve stem is °.

[0010] Furthermore, an outer indicating shell is fixedly mounted on the top of the extended metal cylinder, a driving sleeve and an indicating disk are rotatably mounted inside the outer indicating shell, the driving sleeve and the indicating disk are connected through a gear set, and the driving sleeve is fixedly mounted on the driving rod.

[0011] Furthermore, a rotating shaft is provided at both ends of the inner valve plate, and the rotating shaft is rotatably installed in the outer valve ring. An outer surface of the rotating shaft is provided with an outer spiral groove, and a guide groove is provided on the outer side of the outer valve ring. The rotating shaft passes through the guide groove. The internal sealing sliding connection of the guide groove is provided with a top sleeve, and a transmission protrusion is provided on the inner wall of the top sleeve. The transmission protrusion is inserted into the outer spiral groove, and a top spring is provided between the top sleeve and the rotating shaft.

[0012] Furthermore, the end of the top sleeve away from the rotating shaft is designed as an arc.

[0013] Furthermore, a mounting groove is provided on the outer side of the outer valve ring, the valve plate seal is sleeved in the mounting groove, and a mounting ring is fixedly installed on the outer side of the mounting groove, and the mounting ring clamps the valve plate seal in the mounting groove.

[0014] The beneficial effects of the present invention are as follows: 1. The valve of the present invention is designed to be installed at an angle of 45°, so that the medium in the pipeline is accumulated at the shear function between the valve body seal and the valve plate seal. When the valve is closed, the valve plate assembly can push away the impurities accumulated at the valve body seal position, and some long strip impurities hanging on the valve body seal and granular impurities accumulated on the valve body seal can be scraped clean by the shear position formed by the valve body seal and the valve plate seal, thereby ensuring the sealing performance.

[0015] 2. The valve plate assembly of the present invention adopts a double-ring design. The outer valve ring is inclined at 45°, and the inner valve plate remains vertical, which can alleviate the turbulence problem in fluid flow. Since the outer ring and the inner ring can respectively play a role in guiding the fluid, the combination of the inclination of the outer ring and the vertical state of the inner ring can achieve a relatively smooth flow path, reduce some phenomena of irregular flow. In the case of large flow rate and high pressure, it can effectively reduce the disorder of the fluid direction, reduce the friction and wear on the internal components of the valve. After long-term operation, the sealing performance and mechanical life of the valve can be improved, thereby reducing the frequency of maintenance and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic cross-sectional structure diagram of the valve body of the present invention; Figure 3 is a schematic diagram of the structure of the valve plate assembly and the valve stem of the present invention; Figure 4 is a schematic diagram of the valve plate assembly of the present invention; Figure 5 is a schematic cross-sectional structure diagram of a part of the valve plate assembly of the present invention; Figure 6 is a schematic diagram of the structure of the extended metal cylinder of the present invention; Figure 7 is a schematic diagram of the structure of the outer indicating shell of the present invention Figure 1 ; Figure 8 is a schematic diagram of the structure of the outer indicating shell of the present invention Figure 2 .

[0017] Reference numerals: 1, valve body; 11, self-lubricating bearing; 12, low-leakage packing; 13, sealing ring; 2, valve body seal; 3, valve plate assembly; 31, outer valve ring; 32, valve plate seal; 33, mounting ring; 34, inner valve plate; 35, rotating shaft; 36, outer spiral groove; 37, guide groove; 38, top sleeve; 39, driving projection; 310, top spring; 4, valve stem; 5, gear box; 6, extended metal cylinder; 7, driving rod; 8, bevel gear; 9, outer indicating shell; 91, driving sleeve; 92, indicating disk. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0019] Example 1, as Figures 1 - 8As shown, a multi - combination sealed underground butterfly valve for heat supply includes a valve body 1. The valve body 1 is installed on a horizontal pipeline at an inclination of 45° in the vertical plane. A valve body seal 2 is installed on the inner wall of the valve body 1. A valve stem 4 is rotatably installed inside the valve body 1. A valve plate assembly 3 is fixedly installed on the valve stem 4. The valve plate assembly 3 includes an outer valve ring 31 fixedly installed on the valve stem 4. A valve plate seal 32 is installed on the outer side of the outer valve ring 31. The inner wall of the outer valve ring 31 is designed as an arc. An inner valve plate 34 is rotatably installed inside the outer valve ring 31 in a sealed manner, and the rotation axis of the inner valve plate 34 is perpendicular to the axis of the valve stem 4. A gearbox 5 is fixedly installed at the top of the valve body 1. An extended metal cylinder 6 is fixedly installed on the outer side of the gearbox 5. A drive rod 7 is rotatably installed inside the extended metal cylinder 6. The drive rod 7 can drive the valve stem 4 to rotate through the gearbox 5.

[0020] Further, an installation groove is opened on the outer side of the outer valve ring 31. The valve plate seal 32 is sleeved in the installation groove. An installation ring 33 is fixedly installed on the outer side of the installation groove. The installation ring 33 clamps the valve plate seal 32 in the installation groove. The valve body seal 2 also adopts the same installation method.

[0021] During installation, the valve body 1 is installed on the horizontal pipeline at an inclination of 45° in the vertical plane. There is no need to build a valve well. After installation, the valve and the pipeline are backfilled together. The operating part of the valve, that is, the top of the drive rod 7, is exposed to a position below the ground surface, so that personnel can directly operate the valve on the road surface. This not only reduces the floor area occupied by building the valve well, but also saves the construction funds of the valve well. Most importantly, it avoids the potential safety hazards for personnel caused by going down the well. When opening, rotate the drive rod 7. The drive rod 7 drives the valve stem 4 to rotate through the gearbox 5. The valve stem 4 drives the outer valve ring 31 to rotate. Due to the 45° inclination design of the valve body 1 itself, the rotated outer valve ring 31 is inclined at 45° in the pipeline. At this time, impurities will not accumulate at the rotating position of the valve stem 4 inside the valve body 1. The impurities accumulate at the shearing function position between the valve body seal 2 and the valve plate seal 32. When the valve is closed, the valve plate seal 32 can push away the impurities accumulated on the valve body seal 2. Some long - strip impurities hanging on the valve body seal 2 and the particulate impurities accumulated on the valve body seal 2 can be scraped clean by the shearing position formed by the valve body seal 2 and the valve plate seal 32, thus ensuring the sealing performance.

[0022] Since the valve plate assembly 3 is tilted in the pipeline when it is opened, if the overall tilted state is maintained, when the flow velocity inside the pipeline is too high, the medium will have an irregular flow pattern during the flow process, especially for parameters such as fluid velocity and pressure, which may cause uneven distribution, affecting the flow efficiency of the fluid and the pressure distribution of the pipeline, and thus affecting the overall service life of the valve. Therefore, the present invention adopts a double-ring design. While ensuring shearing and scraping impurities, when the valve is opened, the inner valve plate 34 rotates 45° relative to the outer valve ring 31, and the inner valve plate 34 remains in a vertical state. The outer ring and the inner ring can respectively play the role of guiding the fluid. The combination of the tilt of the outer ring and the vertical state of the inner ring can achieve a relatively smooth flow path and reduce some irregular flow phenomena. Under the condition of large flow and high pressure, it can effectively reduce the turbulence of the fluid direction and reduce the friction and wear on the internal components of the valve. After long-term operation, the sealing performance and mechanical life of the valve can be improved, thereby reducing the frequency of maintenance and replacement.

[0023] Embodiment 2, based on the above embodiment, further includes that a self-lubricating bearing 11 is provided between the valve body 1 and the valve stem 4, and no maintenance is required during the entire product life cycle, thereby avoiding frequent maintenance operations during on-site operations.

[0024] Embodiment 3, based on the above embodiment, further includes that a low-leakage packing 12 is provided between the valve body 1 and the valve stem 4 , and the low-leakage packing 12 is located above the self-lubricating bearing 11 .

[0025] Furthermore, two groups of sealing rings 13 are arranged between the valve body 1 and the valve stem 4 , and the two groups of sealing rings 13 are located above the low-leakage packing 12 .

[0026] At the sealing position between the valve stem 4 and the valve body 1, a multiple combination sealing packing design is adopted. First, a low-leakage packing 12 is used at the lower part, which can continuously compensate the seal when the valve stem 4 rotates. Two sets of sealing rings 13 are also arranged behind this seal. Even if the previous seal fails, it can effectively block the leakage of the medium. In addition, there is a static sealing structure design between the extended metal cylinder 6 and the gear box 5, and there is no leakage or risk of leakage. The top of the gear box 5 is sealed with a cover plate as a whole. The valve stem 4 has no leakage structure and there is no risk of medium leakage.

[0027] Embodiment 4, based on the above embodiment, further includes that a worm wheel and a worm are rotatably installed inside the gear box 5, the worm wheel is fixedly installed on the valve stem 4, the drive rod 7 is connected to the worm gear through the bevel gear 8, and the angle between the extended metal tube 6 and the valve stem 4 is 45°.

[0028] Through the design of the bevel gear 8, the extended metal cylinder 6 and the drive rod 7 can be kept in a vertical state to correct the switch position and the road surface inclination caused by the valve being installed at a 45-degree tilt.

[0029] Embodiment 5, based on the above embodiment, further includes: an outer indicator shell 9 is fixedly installed on the top of the extended metal cylinder 6, and a drive sleeve 91 and an indicator plate 92 are rotatably installed inside the outer indicator shell 9. The drive sleeve 91 and the indicator plate 92 are connected by a gear set, and the drive sleeve 91 is fixedly installed on the drive rod 7.

[0030] When the driving rod 7 rotates, the driving sleeve 91 is driven to rotate. The driving sleeve 91 drives the indicator plate 92 to rotate through the gear set. The indicator plate 92 is set on the upper part of the extended metal cylinder 6 to display the valve status. The device adopts a purely mechanical structure of a gear set, which has a stable structure and reliable operation. It does not require the intervention of external energy and can work stably for a long time. The transmission ratio of the gear transmission is made according to the transmission ratio of the lower gear box 5, so that the input and output data of the driving rod 7 are completely consistent, which can be consistent with the actual position of the valve.

[0031] Embodiment 6, on the basis of the above embodiments, further includes that both ends of the inner valve plate 34 are provided with a rotating shaft 35, the rotating shaft 35 is rotatably installed in the outer valve ring 31, the outer surface of the rotating shaft 35 is provided with an outer spiral groove 36, the outer side of the outer valve ring 31 is provided with a guide groove 37, the rotating shaft 35 penetrates into the guide groove 37, the internal sealing sliding connection of the guide groove 37 is provided with a top sleeve 38, the inner wall of the top sleeve 38 is provided with a transmission protrusion 39, the transmission protrusion 39 is inserted into the outer spiral groove 36, and a top spring 310 is provided between the top sleeve 38 and the rotating shaft 35.

[0032] Furthermore, one end of the top sleeve 38 away from the rotating shaft 35 is designed as an arc.

[0033] The driving rod 7 is rotated, and the driving rod 7 drives the valve stem 4 to rotate through the gear box 5, and the valve stem 4 drives the outer valve ring 31 to rotate. Since the valve body 1 itself is designed to be inclined at 45 degrees, the outer valve ring 31 after rotation is inclined at 45 degrees in the pipeline. At the same time, the outer valve ring 31 drives the top sleeve 38 away from the inner wall of the valve body 1, and the top spring 310 pushes the top sleeve 38 to extend. Since the top sleeve 38 can only slide in the guide groove 37 and cannot rotate, the top sleeve 38 drives the rotating shaft 35 to rotate through the transmission protrusion 39 and the outer spiral groove 36, and the rotating shaft 35 drives the inner valve plate 34 to rotate. The outer valve ring 31 is rotated 45° and the inner valve plate 34 is rotated to a vertical state without the need for additional drive. The structure is simple and compact. When the valve is closed, the top sleeves 38 at both ends are pressed against the inner wall of the valve body 1 under the action of the top springs 310, which can support and position the valve plate assembly 3 as a whole, further improving the stability of the valve closure. The top sleeve 38 has an arc design at one end away from the rotating shaft 35, which will not scratch the inner wall of the valve body 1. It should be noted that after the valve plate assembly 3 is tilted as a whole, the center of gravity of the inner valve plate 34 is biased downward, and the inner valve plate 34 can maintain a vertical state more stably.

[0034] The foregoing description of the disclosed embodiments enables those skilled in the art to practice or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multiple combined sealed underground butterfly valve for heat supply, comprising a valve body (1), characterized in that, The valve body (1) is installed on a horizontal pipeline at an angle of 45 degrees on a vertical plane, a valve body seal (2) is installed on the inner wall of the valve body (1), a valve stem (4) is rotatably installed inside the valve body (1), a valve plate assembly (3) is fixedly installed on the valve stem (4), the valve plate assembly (3) comprises an outer valve ring (31) fixedly installed on the valve stem (4), a valve plate seal (32) is installed on the outer side of the outer valve ring (31), the inner wall of the outer valve ring (31) is designed to be circular arc, an inner valve plate (34) is rotatably installed inside the outer valve ring (31), and the rotation axis of the inner valve plate (34) is perpendicular to the axis of the valve stem (4); A gear box (5) is fixedly mounted on the top of the valve body (1), an extended metal cylinder (6) is fixedly mounted on the outside of the gear box (5), a drive rod (7) is rotatably mounted inside the extended metal cylinder (6), and the drive rod (7) can drive the valve stem (4) to rotate via the gear box (5).

2. The multiple combined sealed underground butterfly valve for heat supply according to claim 1, wherein, A self-lubricating bearing (11) is provided between the valve body (1) and the valve stem (4).

3. The multiple combined sealed underground butterfly valve for heat supply according to claim 2, characterized in that A low-leakage filler (12) is provided between the valve body (1) and the valve stem (4), and the low-leakage filler (12) is located above the self-lubricating bearing (11).

4. A multiple combined sealed underground butterfly valve for heating according to claim 3, characterized in that, Two groups of sealing rings (13) are arranged between the valve body (1) and the valve stem (4), and the two groups of sealing rings (13) are located above the low-leakage filler (12).

5. The multiple combined sealed underground butterfly valve for heat supply according to claim 1, characterized in that, A worm wheel and a worm are rotatably mounted inside the gear box (5), the worm wheel is fixedly mounted on the valve stem (4), the drive rod (7) is connected to the worm gear through a bevel gear (8), and the angle between the extended metal cylinder (6) and the valve stem (4) is 45 degrees.

6. The multiple combined sealed underground butterfly valve for heat supply according to claim 5, characterized in that, An outer indicating housing (9) is fixedly mounted on the top end of the extended metal cylinder (6), a driving sleeve (91) and an indicating plate (92) are rotatably mounted inside the outer indicating housing (9), the driving sleeve (91) and the indicating plate (92) are connected via a gear train, and the driving sleeve (91) is fixedly mounted on the driving rod (7).

7. A multiple combined sealed underground butterfly valve for heating according to claim 1, characterized in that, A rotating shaft (35) is provided at both ends of the inner valve plate (34). The rotating shaft (35) is rotatably mounted in the outer valve ring (31). An outer surface of the rotating shaft (35) is provided with an outer spiral groove (36). A guide groove (37) is provided on the outer side of the outer valve ring (31). The rotating shaft (35) passes through the guide groove (37). A top sleeve (38) is sealingly and slidably connected inside the guide groove (37). A transmission protrusion (39) is provided on the inner wall of the top sleeve (38). The transmission protrusion (39) is inserted into the outer spiral groove (36). A top spring (310) is provided between the top sleeve (38) and the rotating shaft (35).

8. A multiple combined sealed underground butterfly valve for heating according to claim 7, characterized in that, The end of the top sleeve (38) away from the rotating shaft (35) is designed as an arc.

9. A multiple-combination sealed underground butterfly valve for heating according to any one of claims 1-8, characterized in that, The outer side of the outer valve ring (31) is provided with a mounting groove, the valve plate sealing member (32) is sleeved in the mounting groove, and a mounting ring (33) is fixedly mounted on the outer side of the mounting groove, the mounting ring (33) clamps the valve plate sealing member (32) in the mounting groove.

Images