A quick - shut and regulating integrated valve for ultra - low - temperature and low - pressure esterification steam waste heat recovery

Abstract

The present invention relates to the technical field of quick-closing regulating integrated valves, and discloses a quick-closing regulating integrated valve for ultra-low temperature and low-pressure esterification steam waste heat recovery, which includes a valve body, a quick-closing valve, a regulating valve I and a regulating valve II. The valve body, the quick-closing valve, the regulating valve I and the regulating valve II are connected to each other. The quick-closing valve includes a housing, and bolts and gaskets are arranged on the side surface of the housing for connection. For this quick-closing regulating integrated valve for ultra-low temperature and low-pressure esterification steam waste heat recovery, a guide is added to the valve stem to make the valve stem can only move linearly and cannot rotate; the governing oil motor and the quick-closing valve oil motor adopt self-supplying oil motors, without external pipelines, reducing pipelines and welding, and ensuring the oil quality during the operation of the unit; between the valve stem and the valve sleeve, a graphite ring is added, and a gas leakage port is adopted to suck away the excess gas through vacuum.

Description

Technical Field

[0001] The present invention relates to the technical field of quick - closing and regulating integrated valves, and specifically to a quick - closing and regulating integrated valve for waste heat recovery of ultra - low - temperature and low - pressure esterification steam. Background Technique

[0002] The quick - closing and regulating combined valve of a steam turbine is the main opening - closing and control mechanism between the main steam pipeline and the steam turbine. It can regulate the steam intake of the steam turbine and immediately cut off the steam intake of the steam turbine in case of an emergency, enabling the unit to quickly shut down. Most of the existing quick - closing and regulating combined valves of steam turbines are composed of individual component parts connected by pipelines. This makes the steam turbine pipelines numerous, the installation complex, the combined control effect poor, and the reliability and safety of the steam turbine operation cannot be guaranteed. There are the following problems:

[0003] 1. After the valve is fully opened, under the impact of steam, the valve stem and valve disc rotate and are prone to breakage.

[0004] 2. Ultra - low - temperature and low - pressure esterification steam is corrosive, and many materials are made of alloy steel and are prone to corrosion.

[0005] 3. The installation and layout are very inconvenient, there are many oil pipelines, and the layout looks ugly.

[0006] 4. Air leakage and jamming often occur between the valve stem and the valve sleeve.

[0007] 5. Between the oil cylinder and the valve stem, a sealing head body is used for sealing. When the sealing parts are damaged, oil leakage is likely to occur.

[0008] 6. The alignment of the valve stems of the regulating valve and the quick - closing valve with the oil cylinder is poor, and the valve stem and sealing parts are prone to wear.

[0009] 7. For the full opening and full closing of the quick - closing valve, there is a remote signal, but the operation of the regulating valve cannot be monitored.

[0010] 8. The closing time of the regulating valve is relatively long, greater than 1 s.

[0011] 9. The oil quality cannot be guaranteed. During welding, the welding pipes are not washed clean, which is prone to jamming the electro - hydraulic converter and the spool valve.

[0012] 10. The oil cylinder is sealed with polytetrafluoroethylene, the sealing effect is poor, and the output force of the oil cylinder is far lower than the theoretically calculated value.

[0013] 11. The structure is complex, the volume is large, and the serialization is poor.

[0014] It can be seen that there is an urgent need for a quick - closing and regulating integrated valve for waste heat recovery of ultra - low - temperature and low - pressure esterification steam to solve the above - mentioned problems. Summary of the Invention

[0015] The object of the present invention is to provide a quick - closing and regulating integrated valve for ultra - low - temperature and low - pressure esterification steam waste heat recovery, so as to solve the problems raised in the above - mentioned background technology.

[0016] To solve the above - mentioned technical problems, the present invention provides the following technical solution: A quick - closing and regulating integrated valve for ultra - low - temperature and low - pressure esterification steam waste heat recovery, comprising a valve body, a quick - closing valve, a regulating valve I and a regulating valve II. The valve body, the quick - closing valve, the regulating valve I and the regulating valve II are connected to each other. The quick - closing valve includes a housing. Bolts and washers are arranged on the side surface of the housing for connection. Electro - hydraulic actuators are installed on both sides of the housing. An oil cylinder assembly is communicated with the side surface of the housing. At the top of the inner shaft rod of the oil cylinder assembly, a valve rod II is installed. A bushing II is sleeved on the outer surface of the valve rod II. A bushing I is sleeved on the bushing II. A graphite ring and a bushing IV are also sleeved on the outer surface of the bushing I. The end of the bushing I also penetrates through the valve cover and the sleeve I and is connected to a perforated bolt. A valve seat and a valve disc are thread - connected to the perforated bolt. A pipe joint is fixedly connected to the top of the oil cylinder assembly.

[0017] The regulating valve I is composed of an inner hexagon screw, a bushing II, a bushing I, a washer II, a type - I hexagon nut, a stud II, a valve cover II, a valve rod I, a valve disc II and a valve seat II. The bushing II and the bushing I are sleeved on the outer surface of the valve rod I. A graphite ring is installed at the joint of the valve rod I. A sleeve I is installed at the upper top of the valve rod I. A perforated bolt is sleeved on the surface of the sleeve I. A connecting rod and a valve rod connecting sleeve II are respectively installed at the lower end of the valve rod I. A bushing III is also sleeved on the outer surface of the valve rod I.

[0018] The regulating valve I further includes a valve rod connecting sleeve II, a connecting rod II, a regulating valve rod, a compression nut, a valve cover I, a regulating valve seat, a cylindrical pin, a regulating valve head guiding disc and a toothed gasket. The connecting rod II is connected to the regulating valve rod by the valve rod connecting sleeve II. The compression nut fixes the valve cover I. Graphite ring II and sleeve II are sleeved on the outer surface of the regulating valve rod. The lower end of the regulating valve rod penetrates through the regulating valve seat. The regulating valve rod is fixedly connected to the regulating valve head. A guiding disc is installed at the lower end of the regulating valve rod.

[0019] Preferably, the electro - hydraulic actuator and the housing are connected by bolts II and washers II, and the upper and lower electro - hydraulic actuators are symmetrically distributed.

[0020] Preferably, valve rod connecting sleeves are installed at the connection between the top of the inner shaft rod of the oil cylinder assembly and the valve rod II, and the two valve rod connecting sleeves are connected by inner hexagon screws.

[0021] Preferably, the outer shell of the oil cylinder assembly is connected by studs, washers II and type - I hexagon nuts.

[0022] Preferably, a bracket is installed on the outer surface of the oil cylinder assembly and fixed by the second hexagon socket head cap screw and the third washer. A probe is installed on the bracket and extends into the interior of the oil cylinder assembly.

[0023] Preferably, a second pipe joint is provided on the side of the first regulating valve, and the first regulating valve communicates with the second regulating valve.

[0024] Preferably, a toothed gasket is provided between the guiding disc and the valve, and the toothed gasket is fixed by the third bolt.

[0025] Preferably, reinforcing ribs are provided at the force-bearing positions of the valve body, the quick closing valve, the first regulating valve and the second regulating valve.

[0026] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0027] 1. Guidance is added to the valve stem, enabling the valve stem to only move translationally and not rotationally.

[0028] 2. The throttle servomotor and the quick closing valve servomotor adopt self-supplying servomotors, eliminating the need for external pipe connections, reducing pipelines and welding, and ensuring the oil quality during the operation of the unit.

[0029] 3. A graphite ring is added between the valve stem and the valve sleeve, and a gas leakage port is adopted. Excess gas is sucked away through vacuum.

[0030] 4. A leak-free seal is adopted between the oil cylinder and the valve stem. Even if the seal is damaged, it will not leak to the valve stem, thus preventing fire.

[0031] 5. The regulating valve adopts a pre-opening valve + double valve discs, which can effectively reduce the force on the servomotor.

[0032] 6. According to the corrosive characteristics of the ultra-low temperature and low-pressure esterification steam, the materials are specially designed.

[0033] 7. Remote control is adopted to solve the problem of inconvenient installation position and inconvenient testing.

[0034] 8. The servomotor adopts soft seal and zero internal leakage.

[0035] 9. A quick closing valve structure is adopted, and the closing speed is less than 0.5S.

[0036] 10. In terms of structural design, one-way steam inlet and two-way steam outlet are adopted. The two-way steam outlet combines different structures. The first way is a single valve + pre-opening valve, and the second way adopts double valve discs, achieving good balance. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic structural diagram of the valve body of the present invention;

[0038] Figure 2 This is a structural cross-sectional view of the quick-closure valve of the present invention;

[0039] Figure 3 This is a structural cross-sectional view of the regulating valve of the present invention.

[0040] Wherein: 1. Valve body; 2. Bolt; 3. Washer; 4. Electro-hydraulic actuator; 5. Bolt II; 6. Washer II; 8. Cylinder assembly; 9. Valve stem connecting sleeve; 10. Allen screw; 11. Valve stem II; 12. Bushing II; 13. Bushing I; 14. Stud; 15. Washer II; 16. Hexagon nut type I; 17. Graphite ring; 18. Bushing IV; 19. Valve cover; 20. Sleeve I; 21. Bolt with hole; 22. Valve seat; 23. Valve disc; 24. Pipe joint; 25. Connecting rod; 26. Valve stem connecting sleeve II; 27. Stud II; 28. Valve cover II; 29. Bushing III; 30. Valve stem I; 31. Valve disc II; 32. Valve seat II; 33. Connecting rod II; 34. Regulating valve stem; 35. Compression nut; 36. Valve cover I; 37. Graphite ring II; 38. Sleeve II; 39. Regulating valve seat; 40. Cylindrical pin; 41. Regulating valve head; 42. Guide disc; 43. Bolt III; 44. Tooth-shaped gasket; 45. Pipe joint II; 46. Bracket; 47. Allen screw II; 48. Washer III; 49. Probe. Specific embodiments

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] Please refer to Figures 1-3 , a quick-closure regulating integrated valve for ultra-low temperature and low-pressure esterification steam waste heat recovery, comprising a valve body 1, a quick-closure valve, a regulating valve I and a regulating valve II. The valve body 1, the quick-closure valve, the regulating valve I and the regulating valve II are connected to each other. The quick-closure valve includes a housing. Bolts 2 and washers 3 are provided on the side of the housing for connection. Electro-hydraulic actuators 4 are installed on both sides of the housing. An oil cylinder assembly 8 is communicated with the side of the housing. The top end of the inner shaft of the oil cylinder assembly 8 is provided with a valve stem II 11. A bushing II 12 is sleeved on the outer surface of the valve stem II 11. A bushing I 13 is sleeved on the bushing II 12. A graphite ring 17 and a bushing IV 18 are also sleeved on the outer surface of the bushing I 13. The end of the bushing I 13 also penetrates through the valve cover 19 and the sleeve I 20 and is connected to a bolt with hole 21. A valve seat 22 and a valve disc 23 are threadedly connected to the upper part of the bolt with hole 21. The top of the oil cylinder assembly 8 is fixedly connected to a pipe joint 24;

[0043] The first regulating valve consists of an Allen screw 10, a second bushing 12, a first bushing 13, a second washer 15, a type-I hexagon nut 16, a double-end stud 27, a second valve cover 28, a first valve stem 30, a second valve disc 31, and a second valve seat 32. The second bushing 12 and the first bushing 13 are sleeved on the outer surface of the first valve stem 30. A graphite ring 17 is installed at the joint of the first valve stem 30. A first sleeve 20 is installed at the upper end of the first valve stem 30. A bolt with holes 21 is sleeved on the surface of the first sleeve 20. A connecting rod 25 and a second valve stem connecting sleeve 26 are respectively installed at the lower end of the first valve stem 30. A third bushing 29 is also sleeved on the outer surface of the first valve stem 30;

[0044] The first regulating valve includes a second valve stem connecting sleeve 26, a second connecting rod 33, a regulating valve stem 34, a compression nut 35, a first valve cover 36, a regulating valve seat 39, a cylindrical pin 40, a regulating valve head 41, a guide disc 42, and a toothed gasket 44. The second connecting rod 33 is connected to the regulating valve stem 34 using the second valve stem connecting sleeve 26. The compression nut 35 fixes the first valve cover 36. A second graphite ring 37 and a second sleeve 38 are sleeved on the outer surface of the regulating valve stem 34. The lower end of the regulating valve stem 34 penetrates through the regulating valve seat 39. The regulating valve stem 34 is fixedly connected to the regulating valve head 41. A guide disc 42 is installed at the lower end of the regulating valve stem 34.

[0045] Steam enters the ultra-low temperature and low-pressure esterification steam from the inlet port. This gas is highly corrosive. When it reaches the quick-acting shut-off valve part, the quick-acting shut-off valve is in the closed state under the action of the oil cylinder assembly 8, the valve disc 23, the valve seat 22, and the second valve stem 11. At the same time, the valve disc 23 is subjected to the steam pressure, making the valve disc 23 and the valve seat 22 press tighter and tighter, ensuring the tightness of the quick-acting shut-off valve;

[0046] In order to reduce the opening force of the quick-acting shut-off valve, the bolt with holes 21 and the valve disc 23 are designed as a pre-opening valve, and the pre-opening is 13 mm. Before the quick-acting shut-off valve is opened, the pre-opening valve is opened first. After the pre-opening valve is fully opened and the pressure before and after the quick-acting shut-off valve is the same, then the valve disc 23 is opened. At this time, the force on the valve disc 23 is smaller, and the small oil cylinder can pull it. The valve disc 23 slowly opens under the action of the second valve stem 11 until the quick-acting shut-off valve is fully opened. After the quick-acting shut-off valve is fully opened, the stroke of 125 mm + 13 mm is greater than the stroke of the oil cylinder. This design can avoid the first bushing 13 from being stressed and damaging the valve disc.

[0047] The oil cylinder assembly 8 is the quick-acting shut-off valve oil cylinder, which adopts a quick-closing valve + leak-free design. The oil cylinder can quickly return oil through the quick-closing valve. Under the action of the spring, the quick-acting shut-off valve closes at a speed less than 0.5 s. At the same time, the connection between the lower cover of the oil cylinder and the valve stem adopts a leak-free seal, which can ensure that there is no oil leakage after the oil motor has been used for a long time.

[0048] At the same time, the oil cylinder assembly 8 also has an on-line test function. By setting the probe 49, it can test whether the oil cylinder is stuck without shutting down the machine, and during the test, it does not affect the power of the steam turbine.

[0049] After the quick - closing valve is fully opened, steam enters the first regulating valve and the second regulating valve respectively, and enters different outlets through the first regulating valve and the second regulating valve. The first regulating valve is designed with single - valve + pre - opening valve control, and the second regulating valve is designed with double - valve disc control.

[0050] The first regulating valve consists of valve seat two 32, valve disc two 31, perforated bolt 21, and valve stem one 30. Here, the pre - opening valve is designed with a size of 12, and the specific requirements are the same as those of the quick - closing valve. With this design, steam will not leak, and the steam turbine can be started from zero speed.

[0051] The second regulating valve consists of regulating valve seat 39, regulating valve head 41, cylindrical pin 40, and regulating valve stem 34. Here, it is designed with double - valve disc opening. Through the gap, part of the steam can enter the steam turbine, but it can also ensure that the steam turbine rotor will not rotate. At the same time, it can also ensure that after the pre - opening valve of the first regulating valve is opened, the pressure difference before and after is very small, and the regulating valve can be easily opened.

[0052] At the same time, graphite seals plus leak holes are adopted at the valve stems of the quick - closing valve, the first regulating valve, and the second regulating valve, which can ensure that the valve stem will not leak due to graphite damage.

[0053] The first regulating valve and the second regulating valve adopt self - contained oil motors, which provide their own oil sources without external oil supply. This can ensure the stability and cleanliness of the oil source, reduce the leakage points of the pipeline, greatly increase the safety, and make the closing time less than 1S.

[0054] Specifically, the electro - hydraulic actuator 4 and the housing are connected by bolt two 5 and washer two 6, and the electro - hydraulic actuators 4 on the upper and lower sides are symmetrically distributed.

[0055] Specifically, valve stem connecting sleeves 9 are installed at the connections between the top of the inner shaft rod of the oil cylinder assembly 8 and the valve stem two 11, and the two valve stem connecting sleeves 9 are connected by hexagon socket head cap screws 10.

[0056] Specifically, the outer shell of the oil cylinder assembly 8 is connected by stud bolts 14, washer two 15, and type - I hexagon nuts 16. By connecting in the above - mentioned way, it can ensure that the oil cylinder assembly 8 can be conveniently maintained, and the connection can maintain stable sealing.

[0057] Specifically, a bracket 46 is installed on the outer surface of the oil cylinder assembly 8 and fixed by hexagon socket head cap screws two 47 and washer three 48. A probe 49 is installed on the bracket 46, and the probe 49 extends into the interior of the oil cylinder assembly 8.

[0058] Specifically, a pipe joint two 45 is provided on the side of the first regulating valve. The first regulating valve communicates with the second regulating valve. Steam enters the first regulating valve and the second regulating valve respectively and enters different outlets through the first regulating valve and the second regulating valve. The first regulating valve is designed with a single valve + pre-opening valve control, and the second regulating valve is designed with a double valve disc control.

[0059] Specifically, a toothed gasket 44 is provided between the guiding disc 42 and the valve. The installation strength of the connection is improved through the toothed gasket 44, so as to avoid loosening caused by the operation of the valve body. The toothed gasket 44 is fixed by the third bolt 43.

[0060] Specifically, reinforcing ribs are provided at the force-bearing positions of the valve body 1, the quick-closing valve, the first regulating valve and the second regulating valve, and the strength of the whole device is improved by setting the reinforcing ribs.

[0061] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0062] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An integrated quick - shut - off and regulating valve for ultra - low - temperature and low - pressure esterification steam waste heat recovery, comprising a valve body (1), a quick - shut - off valve, a first regulating valve, and a second regulating valve. The valve body (1), the quick - shut - off valve, the first regulating valve, and the second regulating valve are interconnected, and it is characterized in that: The quick - closing valve includes a housing. Bolts (2) and washers (3) are provided on the side of the housing for connection. Electro - hydraulic actuators (4) are installed on both sides of the housing. An oil cylinder assembly (8) is communicated with the side of the housing. At the top of the inner shaft rod of the oil cylinder assembly (8), a second valve stem (11) is installed. A second bushing (12) is sleeved on the outer surface of the second valve stem (11). A first bushing (13) is sleeved on the second bushing (12). A graphite ring (17) and a fourth bushing (18) are also sleeved on the outer surface of the first bushing (13). The end of the first bushing (13) also passes through the valve cover (19) and the first sleeve (20) and is connected to a bolt with holes (21). A valve seat (22) and a valve disc (23) are thread - connected to the bolt with holes (21). A pipe joint (24) is fixedly connected to the top of the oil cylinder assembly (8). The first regulating valve includes an Allen - head screw (10), a second bushing (12), a first bushing (13), a second washer (15), a hexagon nut of type I (16), a double - end stud two (27), a second valve cover (28), a first valve stem (30), a second valve disc (31) and a second valve seat (32). The second bushing (12) and the first bushing (13) are sleeved on the outer surface of the first valve stem (30). A graphite ring (17) is installed at the joint of the first valve stem (30). A first sleeve (20) is installed at the upper top of the first valve stem (30). A bolt with holes (21) is sleeved on the surface of the first sleeve (20). A connecting rod (25) and a second valve - rod connecting sleeve (26) are respectively installed at the lower end of the first valve stem (30). A third bushing (29) is also sleeved on the outer surface of the first valve stem (30). Valve - rod connecting sleeves (9) are installed at the connection between the top of the inner shaft rod of the oil cylinder assembly (8) and the second valve stem (11). The two valve - rod connecting sleeves (9) are connected by an Allen - head screw (10). The second regulating valve includes a second valve - rod connecting sleeve (26), a second connecting rod (33), a regulating - valve stem (34), a compression nut (35), a first valve cover (36), a regulating - valve seat (39), a cylindrical pin (40), a regulating - valve head (41), a guide disc (42), a toothed gasket (44). The second connecting rod (33) is connected to the regulating - valve stem (34) using the second valve - rod connecting sleeve (26). The compression nut (35) fixes the first valve cover (36). A second graphite ring (37) and a second sleeve (38) are sleeved on the outer surface of the regulating - valve stem (34). The lower end of the regulating - valve stem (34) passes through the regulating - valve seat (39). The regulating - valve stem (34) is fixedly connected to the regulating - valve head (41). A guide disc (42) is installed at the lower end of the regulating - valve stem (34). A second pipe joint (45) is provided on the side of the first regulating valve. The first regulating valve and the second regulating valve communicate with each other.

2. The quick - shut regulating integrated valve for ultra - low - temperature and low - pressure esterification steam waste heat recovery according to claim 1, wherein: The electro - hydraulic actuator (4) and the housing are connected by bolts two (5) and washers one (6), and the upper and lower electro - hydraulic actuators (4) are symmetrically distributed with respect to each other.

3. The quick - closing and regulating integrated valve for ultra - low - temperature and low - pressure esterification steam waste heat recovery according to claim 1, characterized in that: The housing of the oil cylinder assembly (8) is connected by stud bolts (14), washers II (15), and hexagon nuts I (16).

4. The quick - shut regulating integrated valve for ultra - low - temperature and low - pressure esterification steam waste heat recovery according to claim 1, wherein: A bracket (46) is installed on the outer surface of the oil cylinder assembly (8) and fixed by socket head cap screws II (47) and washers III (48). A probe (49) is installed on the bracket (46), and the probe (49) extends into the interior of the oil cylinder assembly (8).

5. The quick - shut regulating integrated valve for ultra - low - temperature and low - pressure esterification steam waste heat recovery according to claim 1, wherein: A serrated gasket (44) is provided between the guide disc (42) and the valve body (1), and the serrated gasket (44) is fixed by bolts III (43).

6. A quick - shut and regulating integrated valve for ultra - low - temperature and low - pressure esterification steam waste heat recovery according to any one of claims 1 - 5, characterized in that: Reinforcing ribs are provided at the force-bearing positions of the valve body (1), the quick closing valve, the regulating valve I, and the regulating valve II.

Images