Ultralow temperature ball valve

Abstract

The utility model discloses an ultralow temperature ball valve, including the valve body, the valve body both ends are fixedly connected with flange plate, install valve stem on the valve body, valve stem outside is fixedly connected with the dripper board, and the dripper board one end sets the valve core, and the valve core is fixedly connected with the connecting rod, and the connecting rod outside is fixedly connected with the fixed block, and the valve stem outside sets the sliding block, and is provided operation box on the valve body, and is installed in the driven gear in operation box, and the driven gear is engageded connection with transmission gear. The utility model discloses through the spring's elasticity makes the sliding block and fixed block keep the adhesion, avoids the contraction amount of valve stem and valve core's difference and produces the gap, ensures the regulation of ball valve opening degree, when the power supply interruption condition appears, and the inside power failure of electromagnetic sleeve makes the connecting shaft and transmission gear go down and separate with transmission gear, can be adjusted through hand wheel drive valve stem rotation, ensures the regulation of ultralow temperature ball valve opening and closing state of staff.

Description

Technical Field

[0001] This utility model relates to the field of ball valve technology, specifically to an ultra-low temperature ball valve. Background Technology

[0002] A cryogenic ball valve is a ball valve specifically designed to operate under extremely low temperature conditions. It is commonly used in systems transporting liquefied gases such as liquefied natural gas and liquefied petroleum gas, where the valve must remain effective and seal at very low temperatures.

[0003] In the existing technology, cryogenic ball valves are mainly used for the flow of cryogenic media, which results in a low temperature on the cryogenic ball valve. At this time, the temperature of the handle on the cryogenic ball valve will also be too low, making it inconvenient for the operator to touch the handle, thus affecting the adjustment of the opening and closing state of the cryogenic ball valve.

[0004] Cryogenic ball valves require insulation during use and are typically encased in an insulation layer along with the pipeline. Since operation is via the valve stem, which extends beyond the insulation layer, heat conduction causes the valve stem's linear contraction relative to room temperature to be less than that of the valve core. This results in a clearance fit between the valve core's plug and the valve stem's insertion hole, meaning the valve core's rotation angle is less than the required adjustment angle. This makes it impossible to adjust the valve to the desired opening degree, affecting accuracy. Furthermore, switching between electric and manual modes for cryogenic ball valves is not easy. Utility Model Content

[0005] The purpose of this invention is to provide an ultra-low temperature ball valve to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a cryogenic ball valve, comprising a valve body, both ends of which are fixedly connected to flanges, a valve stem mounted on the valve body, the outer side of the valve stem being fixedly connected to a drip plate, a valve core disposed at one end of the drip plate, the valve core being fixedly connected to a connecting rod, the outer side of the connecting rod being fixedly connected to a fixing block, a slider disposed on the outer side of the valve stem, an operation box disposed on the valve body, a driven gear installed inside the operation box, the driven gear meshing with a transmission gear, and the bottom of the transmission gear rotatingly engaging with a connecting shaft.

[0007] Preferably, a valve core is sleeved inside the valve body, and sealing rings are provided on both sides of the valve core, with the sealing rings contacting the outer side of the valve core.

[0008] Preferably, the outer side of the valve core is fixedly connected to the connecting rod, one end of the valve rod extends into the valve body and rotates with the connecting rod, and the outer side of the connecting rod is fixedly connected to the fixing block.

[0009] Preferably, the fixing block and the slider are provided with inclined surfaces, the fixing block and the inclined surface of the slider are in contact, and a spring is installed above the slider.

[0010] Preferably, the slider has a limiting groove inside, the valve stem is fixedly connected to the limiting strip on the outside, and the slider slides with the limiting strip through the limiting groove.

[0011] Preferably, the outer side of the valve stem is fixedly connected to the driven gear, a motor is installed inside the operation box, the output end of the motor is fixedly connected to the drive gear, the drive gear is meshed with the transmission gear, and an electromagnetic sleeve is provided at the bottom of the transmission gear.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model uses the elastic force of a spring to push the slider to slide on the outside of the valve stem, so that the slider and the fixed block are in contact. Since both the slider and the fixed block are provided with inclined surfaces on the outside, the spring can ensure that the inclined surfaces of the slider and the fixed block always remain in contact. The limiting strip ensures the stability of the slider's up and down movement. The contact between the slider and the fixed block avoids gaps caused by the different contraction amounts of the valve stem and the valve core, thereby ensuring the accuracy of the valve stem in adjusting the rotation of the valve core and ensuring the adjustment of the ball valve opening.

[0013] 2. This utility model also uses a motor to drive the driven gear to rotate under the cooperation of the transmission gear, so that the valve stem rotates to adjust the opening of the valve core. When the power supply is interrupted, the electromagnetic sleeve is de-energized, causing the connecting shaft and the transmission gear to move down and disengage from the transmission gear. The support rod of the handwheel can then be inserted into the top of the valve stem, and the valve stem can be rotated by the handwheel for adjustment. The spliced ​​design of the handwheel avoids the low temperature of the ball valve from being transmitted to the handle, which would make it inconvenient for the operator to touch the handle, thus ensuring that the operator can adjust the opening and closing state of the cryogenic ball valve. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the overall structure of the valve body of this utility model; Figure 3 This is a partial structural schematic diagram of the present invention; Figure 4 This is a schematic diagram of the valve stem and slider connection structure of this utility model; Figure 5 This is a cross-sectional view of the internal structure of the operation box of this utility model.

[0015] In the diagram: 1. Valve body; 2. Flange; 3. Valve stem; 4. Drip plate; 5. Valve core; 51. Sealing ring; 6. Connecting rod; 7. Fixing block; 8. Sliding block; 9. Limiting strip; 10. Spring; 11. Operating box; 12. Driven gear; 13. Motor; 14. Drive gear; 15. Electromagnetic sleeve; 16. Transmission gear; 17. Connecting shaft; 18. Handwheel. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-5 This utility model provides a technical solution: a cryogenic ball valve, including a valve body 1, with both ends of the valve body 1 fixedly connected to a flange 2. The flange 2 has several threaded holes on its outer side for connection. A first through hole is provided inside the valve body 1 and the flange 2. A valve core 5 is fitted inside the valve body 1, and sealing rings 51 are provided on both sides of the valve core 5, contacting the outer side of the valve core 5. A second through hole is provided inside the valve core 5. The opening degree is adjusted by rotating the valve core 5 in conjunction with the first and second through holes. The sealing rings 51 ensure a tight fit between the valve core 5 and the inside of the valve body 1, enhancing the sealing effect. The valve body 1 is rotatably connected to the valve stem 3 via a valve seat. The valve stem 3 is fixedly connected to the drip plate 4. The valve core 5 is fixedly connected to the connecting rod 6. One end of the valve stem 3 extends into the valve body 1 and rotatably engages with the connecting rod 6. A mounting groove is provided at one end of the valve stem 3, and one end of the connecting rod 6 is located within the mounting groove, allowing the connecting rod 6 to rotate independently of the valve stem 3. The outer side of the connecting rod 6 is fixedly connected to a fixing block 7. Inclined surfaces are provided on the fixing block 7 and the slider 8. The inclined surfaces of the fixing block 7 and the slider 8 are in contact. A spring 10 is installed above the slider 8, and the spring 10 is sleeved on the outer side of the valve stem 3 and located within the valve body. Inside, the spring 10 pushes the slider 8 downward until the inclined surfaces of the fixed block 7 and the slider 8 are tightly fitted. When the valve stem 3 and the valve core 5 experience a difference in linear contraction due to low temperature, a gap will appear at the connection between the fixed block 7 and the slider 8. At this time, the downward movement of the slider 8, with the cooperation of the inclined surfaces, will cause the valve core 5 to rotate slightly, ensuring a tight fit between the fixed block 7 and the slider 8 and reducing the impact of the gap. This ensures that when the valve stem 3 rotates, the inclined surfaces of the fixed block 7 and the slider 8 will cause the valve core 5 to rotate synchronously, enhancing the accuracy of the valve core 5 adjustment. The slider 8 has a limiting groove inside, and the outer side of the valve stem 3 is fixedly connected to the limiting strip 9. The slider 8 slides with the limiting strip 9 through the limiting groove. The limiting groove ensures that the slider 8 will not rotate when it moves up and down on the outer side of the valve stem 3, thus ensuring the synchronicity of the rotation of the valve stem 3 and the valve core 5. The outer side of the valve stem 3 is fixedly connected to the driven gear 12. In actual use, an insulation tube is installed on the outer side of the valve body 1. The driven gear 12 is connected and fixed to the insulation tube through a fixing bracket. The outer side of the valve stem 3 is rotatably engaged with the operating box 11. The drip plate 4 is also located on the outer side of the insulation tube. The edge of the drip plate 4 is inclined downward to effectively drain water droplets. The operating box 11 houses a motor 13, the output of which is fixedly connected to a drive gear 14. A transmission gear 16 meshes with both the driven gear 12 and the drive gear 14. The bottom of the transmission gear 16 is fixedly connected to a connecting shaft 17. An electromagnetic sleeve 15 is installed inside the operating box 11, containing an energized coil. When the coil is energized, it generates a magnetic field that pushes a magnetic block at the bottom of the connecting shaft 17, causing the transmission gear 16 to move upwards. This allows the driven gear 12 to connect with the drive gear 14 via the transmission gear 16. When the power supply is interrupted, the transmission gear 16 and the connecting shaft 17 move downwards and disengage from the drive gear 14. At this point, the square support rod of the handwheel 18 can be inserted into the square slot at the top of the valve stem 3. Rotating the handwheel 18 allows manual adjustment of the ball valve's opening. Working Principle: During use, motor 13 drives gear 14 to rotate, which in turn drives valve stem 3 and driven gear 12 to rotate via transmission gear 16. The inclined surface of slider 8 against fixed block 7 causes valve stem 3 to rotate synchronously with valve core 5, thus adjusting the valve core 5 opening. When a gap arises between valve stem 3 and valve core 5 due to different linear contractions caused by temperature, spring 10 pushes slider 8 up and down on limit strip 9 outside valve stem 3. This allows slider 8 to engage with the inclined surface of fixed block 7, and the inclined surface further drives valve core 5 to rotate, achieving fine-tuning. This ensures the stability of the connection between valve stem 3 and valve core 5 and improves the accuracy of valve core 5 opening adjustment. In the event of a power outage or other special circumstances, the energized coil inside the electromagnetic sleeve 15 is de-energized, causing the transmission gear 16 and connecting shaft 17 to move downwards until they disengage from the drive gear 14. At this point, the driven gear 12 is independently set up from the drive gear 14, allowing the support rod at the bottom of the handwheel 18 to be inserted into the placement groove at the top of the valve stem 3. The handwheel 18 then drives the valve stem 3 to rotate. The independent setting of the handwheel 18 prevents the low temperature of the valve stem 3 from being transmitted to the handwheel 18, thus avoiding any impact on the operator's adjustment.

[0018] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0019] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cryogenic ball valve, comprising a valve body (1), characterized in that: The valve body (1) is fixedly connected to the flange (2) at both ends. A valve stem (3) is installed on the valve body (1). The valve stem (3) is fixedly connected to the drip plate (4) on the outside. A valve core (5) is provided at one end of the drip plate (4). The valve core (5) is fixedly connected to the connecting rod (6). The connecting rod (6) is fixedly connected to the fixing block (7) on the outside. A slider (8) is provided on the outside of the valve stem (3). An operation box (11) is provided on the valve body (1). A driven gear (12) is installed in the operation box (11). The driven gear (12) meshes with the transmission gear (16). The bottom of the transmission gear (16) rotates with the connecting shaft (17).

2. The cryogenic ball valve according to claim 1, characterized in that: The valve body (1) is fitted with a valve core (5), and sealing rings (51) are provided on both sides of the valve core (5). The sealing rings (51) are in contact with the outer side of the valve core (5).

3. The cryogenic ball valve according to claim 2, characterized in that: The valve core (5) is fixedly connected to the connecting rod (6) on the outside. One end of the valve stem (3) extends into the valve body (1) and rotates with the connecting rod (6). The connecting rod (6) is fixedly connected to the fixing block (7) on the outside.

4. The cryogenic ball valve according to claim 3, characterized in that: The fixed block (7) and the slider (8) are provided with inclined surfaces, the fixed block (7) and the slider (8) are in contact with the inclined surfaces, and a spring (10) is installed above the slider (8).

5. A cryogenic ball valve according to claim 4, characterized in that: The slider (8) is provided with a limiting groove inside, and the valve stem (3) is fixedly connected to the limiting strip (9) on the outside. The slider (8) slides with the limiting strip (9) through the limiting groove.

6. The cryogenic ball valve according to claim 1, characterized in that: The valve stem (3) is fixedly connected to the driven gear (12) on the outside. A motor (13) is installed inside the operation box (11). The output end of the motor (13) is fixedly connected to the drive gear (14). The drive gear (14) is meshed with the transmission gear (16). An electromagnetic sleeve (15) is provided at the bottom of the transmission gear (16).

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