Accurate temperature control stop valve for low-temperature laboratory

Abstract

The invention relates to the technical field of stop valves, in particular to an accurate temperature control stop valve for a low-temperature laboratory, which comprises a first valve body and a second valve body, the first valve body and the second valve body are in threaded connection, and the inner top of the first valve body close to the second valve body is fixedly connected with a first semicircular plate; a second semicircular plate is fixedly connected to the inner bottom, away from the second valve body, of the first valve body, a fixing plate is fixedly connected between the side walls, close to each other, of the first semicircular plate and the second semicircular plate, and a plurality of flowing holes are evenly formed in the side wall of the fixing plate. And the adjusting mechanism comprises a fixing frame fixedly connected to the upper end of the first valve body in a sealed mode, and two electromagnetic push rods are fixedly connected to the top in the fixing frame. The adjusting mechanism is arranged, the flow of liquid in the first valve body can be accurately controlled, and the problems that in the prior art, the flow of a low-temperature stop valve cannot be accurately controlled, and accurate use in a laboratory is inconvenient are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of stop valves, in particular to a precise temperature-controlled stop valve for low-temperature laboratories. Background Art

[0002] Cryogenic globe valve is a valve specially designed for harsh working conditions, usually working in low temperature environment such as cryogenic laboratory.

[0003] In low-temperature laboratories, most cryogenic stop valves transport liquids at relatively low temperatures. In order to ensure the stability of the temperature of the liquid transported by the cryogenic stop valve, a temperature sensor is installed in the cryogenic stop valve. When the temperature of the liquid in the cryogenic stop valve rises abnormally, the temperature sensor controls the cryogenic stop valve to reduce the flow rate or directly close it. However, this method cannot accurately control the flow rate of the cryogenic stop valve, which is inconvenient for precise use in the laboratory. In addition, a strong water hammer effect will be generated during the process of reducing the flow rate or directly closing the cryogenic stop valve. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art and to propose a precise temperature control stop valve for low temperature laboratories.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A precise temperature control stop valve for low temperature laboratories, comprising: a first valve body and a second valve body, wherein the first valve body and the second valve body are threadedly connected, a first semicircular plate is fixedly connected to the inner top of the first valve body close to the second valve body, a second semicircular plate is fixedly connected to the inner bottom of the first valve body away from the second valve body, a fixing plate is fixedly connected between the side walls of the first and second semicircular plates close to each other, and a plurality of flow holes are evenly distributed on the side walls of the fixing plate; The regulating mechanism includes a fixed frame sealed and fixedly connected to the upper end of the first valve body, two electromagnetic push rods fixedly connected to the top of the fixed frame, the movable ends of the two electromagnetic push rods are commonly fixedly connected to the first plate, the side wall of the first plate and the inner side wall of the fixed frame are sealed and slidably connected, the lower end of the first plate is fixedly connected to a sliding rod, the lower end of the sliding rod passes through the top of the first valve body and is fixedly connected to the second plate, and the lower end of the second plate is fixedly connected to a plurality of blocking rods corresponding to the plurality of flow holes.

[0006] Preferably, the first semicircular plate, the second semicircular plate and the fixed plate divide the first valve body into a first chamber and a second chamber respectively, the second plate is located in the second chamber, and the side wall of the sliding rod is sealed and slidably connected to the inner wall of the first valve body.

[0007] Preferably, a temperature sensor is fixedly connected to the bottom of the second chamber, and the temperature sensor is electrically connected to the two electromagnetic push rods through a first external control mechanism.

[0008] Preferably, a protection mechanism is provided in the second chamber, and the protection mechanism includes a plurality of baffles, and the plurality of baffles are rotatably connected to the inner wall of the second chamber through a rotating shaft, and the side wall of the first valve body is fixedly connected to a plurality of control frames corresponding to the plurality of baffles one by one, and the inner walls of the plurality of control frames are sealed and slidably connected to a third plate, and the third plate is connected to the corresponding baffle close to the side wall of the first valve body through the control mechanism.

[0009] Preferably, the control mechanism includes a control rod fixedly connected to the third plate near the side wall of the first valve body, the side wall of the control rod passes through the side wall of the first valve body and extends into the second chamber, and the side wall of the control rod is sealed and slidably connected to the inner wall of the first valve body, the side wall of the baffle is provided with a groove near the side wall of the control frame, the inner wall of the groove is fixedly connected to the first rectangular rod, the side wall of the first rectangular rod is slidably connected to the slider, and the side wall of the control rod away from the third plate is rotatably connected to the side wall of the slider.

[0010] Preferably, a sealed cavity is formed between the side wall of the third plate away from the first valve body and the inner wall of the control frame, a first tube is connected between the inner walls of two adjacent sealed cavities, an oil storage cavity is formed between the lower end of the first plate, the inner wall of the fixed frame and the side wall of the first valve body, hydraulic oil is provided in the oil storage cavity, and the lower part of the inner wall of the oil storage cavity is connected to the inner wall of one of the sealed cavities through a second tube.

[0011] Preferably, the inner wall of the connection between the first valve body and the sliding rod is provided with two sliding grooves, and the inner walls of the two sliding grooves are slidably connected with T-shaped plug-ins, and the side walls of the T-shaped plug-ins are elastically connected to the inner walls of the sliding grooves through magnetic springs. A plurality of plug holes are evenly distributed on the side walls of both sides of the sliding rod from top to bottom, and the side walls of the T-shaped plug-ins fit in with the inner walls of the adjacent plug holes. The lower end of the first plate is elastically connected to the side wall of the first valve body through a first protective bag, and the upper end of the second plate is elastically connected to the inner wall of the first valve body through a second protective bag. The sliding rod is located in the first and second protective bags, and the temperature sensor, the first external control mechanism and the magnetic spring are electrically connected to the second external control mechanism.

[0012] Preferably, a cleaning mechanism is provided in the first chamber, and the cleaning mechanism includes a circular plate fixedly connected to the inner wall of the first chamber, and a plurality of fan-shaped filter plates are evenly distributed and fixedly connected to the side wall of the circular plate. An annular groove is provided on the inner wall of the first chamber, and a friction plate that can rotate is slidably connected to the inner wall of the annular groove. The friction plate is located between the circular plate and the first semicircular plate, and the side wall of the friction plate away from the circular plate is elastically connected to a permanent magnet plate through a plurality of reset springs. A plurality of rods are fixedly connected to the side wall of the permanent magnet plate, and the plurality of rods correspond one-to-one to the plurality of filter holes on the fan-shaped filter plate.

[0013] Preferably, a driving mechanism is provided on the first semicircular plate, and the driving mechanism includes a one-way bearing, the outer ring side wall of the one-way bearing is fixedly connected to the side wall of the friction plate, the inner ring side wall of the one-way bearing is fixedly connected to a threaded ring, the side wall of the first semicircular plate is rotatably connected to a cross bar, and the side wall of the cross bar located between the circular plate and the first semicircular plate is provided with a reciprocating thread, and a rifle rod is connected to the reciprocating thread, and the side wall of the rifle rod is threadedly connected to the inner wall of the threaded ring during movement, and the side wall of the first semicircular plate is fixedly connected to two second rectangular rods, and the side walls of the two second rectangular rods are both slidably connected to the side wall of the rifle rod.

[0014] Preferably, the crossbar is fixedly connected to a plurality of axial flow blades near the side wall of the second valve body, one of the axial flow blades is made of magnetic material, and the permanent magnet plate and the side wall of the axial flow blade made of magnetic material that is close to each other are attracted to each other.

[0015] Compared with the existing technology, the advantages of the present invention are: 1. An adjusting mechanism is set up, and multiple blocking rods located on the same side correspond to multiple flow holes located on the same side one by one. Then, when the electromagnetic push rod is extended or retracted to different lengths, the coordination between the multiple blocking rods and the multiple flow holes can be controlled. Then, when the liquid flow in the first valve body is reduced, the flow of the liquid in the first valve body can be accurately controlled, avoiding the problem in the prior art that the flow size of the low-temperature stop valve cannot be accurately controlled, which is inconvenient for accurate use in the laboratory.

[0016] 2. A protection mechanism is set up. When the two electromagnetic push rods suddenly extend, multiple third plates drive the baffles to rotate away from the control frame through the control rod and slider, thereby blocking the flow of liquid, slowing down the liquid flow rate and avoiding the water hammer effect.

[0017] 3. Set up the sockets and T-shaped plugs, insert the two T-shaped plugs into the two sockets, fix the position of the slide rod, and prevent the subsequent electromagnetic push rod from being continuously subjected to the full pressure of the liquid, which affects the normal use of the electromagnetic push rod.

[0018] 4. A cleaning mechanism is provided, and multiple fan-shaped filter plates can filter impurities in the liquid to avoid blockage in the first valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural schematic diagram of a precise temperature control stop valve for low-temperature laboratories proposed by the present invention; Figure 2 for Figure 1 A vertical cross-sectional structural diagram of ; Figure 3 for Figure 2 A schematic diagram of the structure at center A; Figure 4 for Figure 2 A magnified schematic diagram of the structure at B in the middle; Figure 5 for Figure 2 A magnified schematic diagram of the structure at C in the middle; Figure 6 for Figure 5 A magnified schematic diagram of the structure at D in the middle; Figure 7 for Figure 1 Schematic diagram of the vertical cross-section structure of the middle protection mechanism; Figure 8 for Figure 1 Schematic diagram of the structure of the middle adjustment mechanism; Figure 9 for Figure 1 Schematic diagram of the structure of the cleaning mechanism and the driving mechanism; Figure 10 Figure 9 Schematic diagram of the rear view structure; Figure 11 for Figure 1 Schematic diagram of the structure after the first valve body and the second valve body are separated.

[0020] In the figure: 1, first valve body; 2, second valve body; 3, first semicircular plate; 4, second semicircular plate; 5, fixed plate; 6, flow hole; 7, first chamber; 8, second chamber; 9, fixed frame; 10, electromagnetic push rod; 11, first plate; 12, slide rod; 13, second plate; 14, blocking rod; 15, temperature sensor; 16, baffle; 17, control frame; 18, third plate; 19, sealing chamber; 20, first tube; 21, control rod; 22, groove; 23, first rectangular rod; 24, Slider; 25. Oil storage chamber; 26. Second tube; 27. First protective bag; 28. Second protective bag; 29. Socket; 30. Slide; 31. T-type plug-in plate; 32. Magnetic spring; 33. Circular plate; 34. Fan-shaped filter plate; 35. Annular groove; 36. Friction plate; 37. Return spring; 38. Permanent magnet plate; 39. Insert rod; 40. Cross bar; 41. Axial fan blade; 42. One-way bearing; 43. Threaded ring; 44. Reciprocating thread; 45. Rifle rod; 46. Second rectangular rod. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Reference Figure 1 - Figure 11A precise temperature control stop valve for low-temperature laboratories includes a first valve body 1 and a second valve body 2, the first valve body 1 and the second valve body 2 are threadedly connected, a first semicircular plate 3 is fixedly connected to the inner top of the first valve body 1 close to the second valve body 2, a second semicircular plate 4 is fixedly connected to the inner bottom of the first valve body 1 away from the second valve body 2, a fixed plate 5 is fixedly connected between the side walls of the first semicircular plate 3 and the second semicircular plate 4 close to each other, and a plurality of flow holes 6 (such as Figure 2 and Figure 8 shown).

[0023] In the present invention, the side walls of the first valve body 1 and the second valve body 2 are fixedly connected with mounting rings, and the liquid used in the low-temperature laboratory flows from the second valve body 2 to the first valve body 1 from left to right (such as Figure 1 shown).

[0024] The regulating mechanism includes a fixed frame 9 sealed and fixedly connected to the upper end of the first valve body 1. Two electromagnetic push rods 10 are fixedly connected to the top of the fixed frame 9. The electromagnetic push rod 10 is an action actuator that uses the working characteristics of the electromagnet to realize the linear reciprocating motion of the push rod, which is a prior art.

[0025] The movable ends of the two electromagnetic push rods 10 are fixedly connected to the first plate 11, and the side walls of the first plate 11 are sealed and slidably connected to the inner walls of the fixed frame 9. Furthermore, a plurality of through holes are opened at the top of the fixed frame 9 to balance the pressure changes in the fixed frame 9 when the first plate 11 slides.

[0026] The lower end of the first plate 11 is fixedly connected to a sliding rod 12, the lower end of the sliding rod 12 passes through the top of the first valve body 1 and is fixedly connected to the second plate 13, and the lower end of the second plate 13 is fixedly connected to multiple blocking rods 14 corresponding to the multiple flow holes 6.

[0027] It should be noted that if Figure 3 and Figure 8 As shown, the lengths of the multiple blocking rods 14 located on the same side decrease from left to right, and the multiple blocking rods 14 located on the same side correspond one-to-one with the multiple flow holes 6 located on the same side. Therefore, when the electromagnetic push rod 10 is extended or retracted to different lengths, the coordination between the multiple blocking rods 14 and the multiple flow holes 6 can be controlled. For example, when the multiple blocking rods 14 located on the leftmost side coordinate with the multiple flow holes 6 located on the leftmost side, the remaining multiple blocking rods 14 are separated from the remaining multiple flow holes 6. Therefore, when the liquid flow in the first valve body 1 is reduced, the flow of the liquid in the first valve body 1 can be accurately controlled, thereby avoiding the inability to accurately control the flow of the low-temperature stop valve in the prior art, which is inconvenient for accurate use in the laboratory.

[0028] The first semicircular plate 3 , the second semicircular plate 4 and the fixed plate 5 divide the first valve body 1 into a first chamber 7 and a second chamber 8 respectively. The second plate 13 is located in the second chamber 8 , and the side wall of the sliding rod 12 is sealed and slidably connected to the inner wall of the first valve body 1 .

[0029] A temperature sensor 15 (such as Figure 2 As shown), the temperature sensor 15 is electrically connected to the two electromagnetic push rods 10 through the first external control mechanism.

[0030] The temperature sensor 15 can sense the temperature changes of the flowing liquid in the first valve body 1. When the temperature of the flowing liquid in the first valve body 1 rises abnormally, the temperature sensor 15 can control the intermittent extension of the two electromagnetic push rods 10 through the first external control mechanism, and the extension length of the two electromagnetic push rods 10 is proportional to the induction signal of the temperature increase on the temperature sensor 15. The control method is the existing technology.

[0031] A protection mechanism is provided in the second chamber 8, which includes a plurality of baffles 16 (such as Figure 7 As shown), multiple baffles 16 are rotatably connected to the inner wall of the second chamber 8 through a rotating shaft, and multiple control frames 17 corresponding to the multiple baffles 16 are fixedly connected to the side wall of the first valve body 1, and the inner walls of the multiple control frames 17 are sealed and slidably connected to the third plate 18 (as shown Figure 4 As shown), the third plate 18 is connected to the side wall of the first valve body 1 through a control mechanism and its corresponding baffle 16.

[0032] The control mechanism includes a control rod 21 fixedly connected to the side wall of the third plate 18 near the first valve body 1. The side wall of the control rod 21 passes through the side wall of the first valve body 1 and extends into the second chamber 8. The side wall of the control rod 21 is sealed and slidably connected to the inner wall of the first valve body 1. A groove 22 is provided on the side wall of the baffle 16 near the control frame 17. A first rectangular rod 23 is fixedly connected to the inner wall of the groove 22. A slider 24 is slidably connected to the side wall of the first rectangular rod 23. The side wall of the control rod 21 away from the third plate 18 is rotatably connected to the side wall of the slider 24.

[0033] A sealed cavity 19 is formed between the side wall of the third plate 18 away from the first valve body 1 and the inner wall of the control frame 17. A first pipe 20 (such as Figure 7 As shown, the oil storage chamber 25 is formed between the lower end of the first plate 11, the inner wall of the fixed frame 9 and the side wall of the first valve body 1 (as shown in FIG. Figure 3 As shown), hydraulic oil is provided in the oil storage chamber 25, and the lower inner wall of the oil storage chamber 25 is connected to the inner wall of one of the sealing chambers 19 through a second pipe 26.

[0034] When the two electromagnetic push rods 10 suddenly extend, the flow rate of the liquid in the first valve body 1 is accelerated, and the downward movement of the first plate 11 will squeeze the hydraulic oil in the oil storage chamber 25 into the multiple sealing chambers 19 evenly through the second tube 26 and the multiple first tubes 20, driving the multiple third plates 18 to move toward the direction close to the side wall of the first valve body 1. The multiple third plates 18 drive the baffle 16 to rotate away from the control frame 17 through the control rod 21 and the slider 24, thereby blocking the flow of the liquid, slowing down the flow rate of the liquid, and avoiding the water hammer effect. When the liquid flows through the multiple baffles 16, part of the liquid will be affected by the reaction force of the multiple baffles 16 to impact the rear liquid, thereby slowing down the liquid flow rate. When the liquid passes through the multiple baffles 16, the cross-sectional area of the liquid suddenly increases, thereby further slowing down the liquid flow rate, thereby further avoiding the water hammer effect.

[0035] Two sliding grooves 30 are provided on the inner wall at the connection between the first valve body 1 and the sliding rod 12, and T-shaped plug plates 31 are slidably connected to the inner walls of the two sliding grooves 30. The side walls of the T-shaped plug plates 31 are elastically connected to the inner walls of the sliding grooves 30 through magnetic springs 32. A plurality of insertion holes 29 are evenly distributed on the side walls of both sides of the sliding rod 12 from top to bottom, and the side walls of the T-shaped plug plates 31 fit into the inner walls of the insertion holes 29 adjacent to them. The lower end of the first plate 11 is elastically connected to the side wall of the first valve body 1 through the first protective bag 27, and the upper end of the second plate 13 is elastically connected to the inner wall of the first valve body 1 through the second protective bag 28. The sliding rod 12 is located in the first protective bag 27 and the second protective bag 28. The temperature sensor 15, the first external control mechanism and the magnetic spring 32 are electrically connected to the second external control mechanism.

[0036] After the magnetic spring 32 is energized, due to electromagnetic induction, the magnetic spring 32 interacts with the current in the external magnetic field to generate different tensile forces to control the tensile deformation and movement state of the magnetic spring 32. When the temperature sensor 15 senses a temperature increase, the second external control mechanism controls the magnetic spring 32 to first be energized and contracted, driving the two T-shaped plugs 31 to separate from the two sockets 29 respectively. Subsequently, the two electromagnetic push rods 10 extend by a corresponding length. Each time the electromagnetic push rod 10 extends, there are always two sockets 29 corresponding to the two T-shaped plugs 31. And after the two electromagnetic push rods 10 are adjusted, the magnetic spring 32 is controlled by the second external control mechanism to be de-energized and extended, so that the two T-shaped plug plates 31 are reinserted into the two sockets 29, fixing the position of the slide rod 12, and preventing the subsequent electromagnetic push rod 10 from being continuously subjected to the full pressure of the liquid, affecting the normal use of the electromagnetic push rod 10.

[0037] The first chamber 7 is provided with a cleaning mechanism, which includes a circular plate 33 fixedly connected to the inner wall of the first chamber 7, and a plurality of fan-shaped filter plates 34 (such as Figure 5As shown), impurities in the liquid can be filtered to avoid blockage in the first valve body 1.

[0038] An annular groove 35 is formed on the inner wall of the first chamber 7. A rotatable friction plate 36 is slidably connected to the inner wall of the annular groove 35. The friction plate 36 is located between the circular plate 33 and the first semicircular plate 3. The side wall of the friction plate 36 away from the circular plate 33 is elastically connected to a permanent magnet plate 38 (such as Figure 10 As shown), the side wall of the permanent magnet plate 38 is fixedly connected to a plurality of plug rods 39, and the plurality of plug rods 39 correspond one to one with the plurality of filter holes on the fan-shaped filter plate 34 (as shown Figure 5 shown).

[0039] The first semicircular plate 3 is provided with a driving mechanism including a one-way bearing 42 (such as Figure 10 As shown in FIG), the outer ring side wall of the one-way bearing 42 is fixedly connected to the side wall of the friction plate 36, and the inner ring side wall of the one-way bearing 42 is fixedly connected to the threaded ring 43 (as shown in FIG). Figure 6 As shown in the figure), the side wall of the first semicircular plate 3 is rotatably connected to a cross bar 40, and the side wall of the cross bar 40 located between the circular plate 33 and the first semicircular plate 3 is provided with a reciprocating thread 44, and a rifle rod 45 is connected to the reciprocating thread 44. The side wall of the rifle rod 45 is threadedly connected to the inner wall of the threaded ring 43 during movement, and the side wall of the first semicircular plate 3 is fixedly connected to two second rectangular rods 46, and the side walls of the two second rectangular rods 46 are both slidably connected to the side wall of the rifle rod 45.

[0040] like Figure 6 As shown, during the movement of the rifle rod 45 from right to left and the threaded connection with the threaded ring 43, the threaded ring 43 is driven to rotate in the forward direction, and the inner ring of the one-way bearing 42 drives its outer ring to rotate, thereby driving the friction plate 36 to rotate. During the movement of the rifle rod 45 from left to right and the separation from the threaded ring 43, the threaded ring 43 is driven to rotate in the reverse direction, and the inner ring of the one-way bearing 42 does not drive its outer ring to rotate, thereby not driving the friction plate 36 to rotate.

[0041] It should be noted that there are six fan-shaped filter plates 34 in the present invention. Every time the rifle rod 45 moves left and right and is threadedly connected to the threaded ring 43, the friction plate 36 will be driven to intermittently rotate sixty degrees through the one-way bearing 42, so that the friction plate 36 drives the permanent magnet plate 38 and multiple plug rods 39 to face the six fan-shaped filter plates 34 respectively.

[0042] The crossbar 40 is fixedly connected to a plurality of axial flow blades 41 near the side wall of the second valve body 2 , wherein one axial flow blade 41 is made of magnetic material, and the permanent magnet plate 38 and the side wall of the axial flow blade 41 made of magnetic material that is close to each other are attracted to each other.

[0043] The arrangement of multiple axial flow blades 41 allows the multiple axial flow blades 41 to rotate under the impact of the liquid when the liquid flows in the first valve body 1, thereby driving the cross bar 40 to rotate, so that the friction plate 36 can intermittently rotate sixty degrees. When the multiple axial flow blades 41 rotate, the axial flow blades 41 made of magnetic material intermittently face the permanent magnet plate 38. At this time, the permanent magnet plate 38 slides back and forth under the magnetic attraction of the axial flow blades 41 and the elastic force of multiple return springs 37, driving the multiple rods 39 to slide back and forth, so that the multiple rods 39 slide back and forth in the multiple filter holes on the corresponding fan-shaped filter plate 34, dredging the multiple filter holes on the fan-shaped filter plate 34 to avoid blockage in the filter holes, and only cleaning the multiple filter holes on one fan-shaped filter plate 34 at a time, which will not affect the circulation of liquid by other fan-shaped filter plates 34.

[0044] When the stop valve is in use, the side walls of the first valve body 1 and the second valve body 2 are fixedly connected with mounting rings, and the liquid used in the low-temperature laboratory flows from the second valve body 2 to the first valve body 1 from left to right (such as Figure 1 shown); The temperature sensor 15 located in the second chamber 8 can sense the temperature change of the flowing liquid in the first valve body 1. When the temperature of the flowing liquid in the first valve body 1 rises abnormally, the magnetic spring 32 is first energized and contracted by the second external control mechanism, driving the two T-shaped plug plates 31 to separate from the two sockets 29 respectively. Then, the temperature sensor 15 can control the two electromagnetic push rods 10 to intermittently extend through the first external control mechanism, and the extension of the two electromagnetic push rods 10 is proportional to the induction signal of the temperature rise on the temperature sensor 15. Its control method is the existing technology; When the electromagnetic push rod 10 is extended or retracted to different lengths, the coordination between the plurality of blocking rods 14 and the plurality of flow holes 6 can be controlled. For example, when the plurality of blocking rods 14 located on the far left are coordinated with the plurality of flow holes 6 located on the far left, the remaining plurality of blocking rods 14 are separated from the remaining plurality of flow holes 6. Thus, when the liquid flow in the first valve body 1 is reduced, the flow of the liquid in the first valve body 1 can be precisely controlled, thereby avoiding the problem in the prior art of being unable to precisely control the flow of the cryogenic shut-off valve, which is inconvenient for precise use in the laboratory. Each time the electromagnetic push rod 10 is extended, there are always two sockets 29 corresponding to the two T-shaped plug plates 31. After the two electromagnetic push rods 10 are adjusted, the second external control mechanism controls the magnetic spring 32 to be de-energized and extended, so that the two T-shaped plug plates 31 are reinserted into the two sockets 29, fixing the position of the slide rod 12 and preventing the electromagnetic push rod 10 from being continuously subjected to the full pressure of the liquid, which would affect the normal use of the electromagnetic push rod 10. When the two electromagnetic push rods 10 are suddenly extended, the flow rate of the liquid in the first valve body 1 is accelerated, and the downward movement of the first plate 11 at this time will squeeze the hydraulic oil in the oil storage chamber 25 into the multiple sealing chambers 19 evenly through the second tube 26 and the multiple first tubes 20, driving the multiple third plates 18 to move in the direction close to the side wall of the first valve body 1, and the multiple third plates 18 drive the baffle 16 to rotate in the direction away from the control frame 17 through the control rod 21 and the slider 24, thereby blocking the flow of the liquid, slowing down the flow rate of the liquid, and avoiding the water hammer effect. When the liquid flows through the multiple baffles 16, part of the liquid will be affected by the reaction force of the multiple baffles 16 to impact the rear liquid, thereby slowing down the flow rate of the liquid. When the liquid passes through the multiple baffles 16, the cross-sectional area of the liquid suddenly increases, thereby further slowing down the flow rate of the liquid, thereby further avoiding the water hammer effect. When the liquid flows in the first valve body 1, the multiple fan-shaped filter plates 34 can filter impurities in the liquid to avoid clogging in the first valve body 1. When the liquid flows in the first valve body 1, the multiple axial-flow fan blades 41 rotate under the impact of the liquid, thereby driving the cross bar 40 to rotate. At this time, the axial-flow fan blades 41 made of magnetic material intermittently face the permanent magnet plate 38. At this time, the permanent magnet plate 38 slides back and forth under the magnetic attraction of the axial-flow fan blades 41 and the elastic force of the multiple return springs 37, driving the multiple rods 39 to slide back and forth, so that the multiple rods 39 slide back and forth in the multiple filter holes on the corresponding fan-shaped filter plates 34, dredging the multiple filter holes on the fan-shaped filter plates 34 to avoid clogging in the filter holes; And during the rotation of the crossbar 40, the threaded ring 43 is driven to move left and right on its side wall (such as Figure 6 As shown in FIG. 4 , when the rifle rod 45 moves from right to left and is threadedly connected to the threaded ring 43, the threaded ring 43 is driven to rotate in the forward direction, and the inner ring of the one-way bearing 42 drives the outer ring thereof to rotate, thereby driving the friction plate 36 to rotate. When the rifle rod 45 moves from left to right and separates from the threaded ring 43, the threaded ring 43 is driven to rotate in the reverse direction, and the inner ring of the one-way bearing 42 does not drive the outer ring thereof to rotate, thereby not driving the friction plate 36 to rotate. In the present invention, there are six sector-shaped filter plates 34. Each time the rifle rod 45 moves left and right and is threadedly connected to the threaded ring 43, the friction plate 36 is driven to intermittently rotate sixty degrees through the one-way bearing 42, so that the friction plate 36 drives the permanent magnet plate 38 and multiple plug rods 39 to face the six sector-shaped filter plates 34 respectively. In this way, only the multiple filter holes on one sector-shaped filter plate 34 are cleaned each time, which will not affect the circulation of liquid by other sector-shaped filter plates 34.

[0045] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A precise temperature control stop valve for low temperature laboratory, characterized in that: include: A first valve body (1) and a second valve body (2), wherein the first valve body (1) and the second valve body (2) are threadedly connected, a first semicircular plate (3) is fixedly connected to the inner top of the first valve body (1) close to the second valve body (2), a second semicircular plate (4) is fixedly connected to the inner bottom of the first valve body (1) away from the second valve body (2), a fixed plate (5) is fixedly connected between the side walls of the first semicircular plate (3) and the second semicircular plate (4) close to each other, and a plurality of flow holes (6) are evenly distributed on the side walls of the fixed plate (5); The regulating mechanism comprises a fixed frame (9) sealed and fixedly connected to the upper end of the first valve body (1), two electromagnetic push rods (10) are fixedly connected to the top of the fixed frame (9), the movable ends of the two electromagnetic push rods (10) are fixedly connected to the first plate (11), the side wall of the first plate (11) and the inner side wall of the fixed frame (9) are sealed and slidably connected, the lower end of the first plate (11) is fixedly connected to a sliding rod (12), the lower end of the sliding rod (12) passes through the top of the first valve body (1) and is fixedly connected to a second plate (13), and the lower end of the second plate (13) is fixedly connected to a plurality of blocking rods (14) corresponding to the plurality of flow holes (6).

2. A precise temperature control stop valve for low temperature laboratory according to claim 1, characterized in that: The first semicircular plate (3), the second semicircular plate (4) and the fixed plate (5) divide the first valve body (1) into a first chamber (7) and a second chamber (8), respectively; the second plate (13) is located in the second chamber (8), and the side wall of the sliding rod (12) is sealed and slidably connected to the inner wall of the first valve body (1).

3. The precise temperature control stop valve for low temperature laboratory according to claim 2, characterized in that: A temperature sensor (15) is fixedly connected to the bottom of the second chamber (8), and the temperature sensor (15) is electrically connected to the two electromagnetic push rods (10) through a first external control mechanism.

4. The precise temperature control stop valve for low temperature laboratory according to claim 2, characterized in that: A protection mechanism is provided in the second chamber (8), and the protection mechanism includes a plurality of baffles (16), and the plurality of baffles (16) are rotatably connected to the inner wall of the second chamber (8) through a rotating shaft. The side wall of the first valve body (1) is fixedly connected to a plurality of control frames (17) corresponding to the plurality of baffles (16). The inner walls of the plurality of control frames (17) are sealed and slidably connected to a third plate (18), and the third plate (18) is connected to the baffle (16) corresponding to the baffle through the control mechanism near the side wall of the first valve body (1).

5. The precise temperature control stop valve for low temperature laboratory according to claim 4, characterized in that: The control mechanism includes a control rod (21) fixedly connected to the side wall of the third plate (18) near the first valve body (1), the side wall of the control rod (21) penetrates the side wall of the first valve body (1) and extends into the second chamber (8), and the side wall of the control rod (21) is sealed and slidably connected to the inner wall of the first valve body (1), the side wall of the baffle (16) near the control frame (17) is provided with a groove (22), the inner wall of the groove (22) is fixedly connected to the first rectangular rod (23), the side wall of the first rectangular rod (23) is slidably connected to the slider (24), and the side wall of the control rod (21) away from the third plate (18) is rotatably connected to the side wall of the slider (24).

6. The precise temperature control stop valve for low temperature laboratory according to claim 4, characterized in that: A sealed cavity (19) is formed between the side wall of the third plate (18) away from the first valve body (1) and the inner wall of the control frame (17), and a first tube (20) is connected between the inner walls of two adjacent sealed cavities (19). An oil storage cavity (25) is formed between the lower end of the first plate (11), the inner wall of the fixed frame (9) and the side wall of the first valve body (1). Hydraulic oil is provided in the oil storage cavity (25), and the lower part of the inner wall of the oil storage cavity (25) is connected to the inner wall of one of the sealed cavities (19) through a second tube (26).

7. The precise temperature control stop valve for low temperature laboratory according to claim 3, characterized in that: Two sliding grooves (30) are provided on the inner wall of the connection between the first valve body (1) and the slide rod (12), and the inner walls of the two sliding grooves (30) are slidably connected with T-shaped plug plates (31). The side walls of the T-shaped plug plates (31) are elastically connected to the inner walls of the sliding grooves (30) through magnetic springs (32). A plurality of plug holes (29) are evenly distributed on the side walls of both sides of the slide rod (12) from top to bottom. The side walls of the T-shaped plug plates (31) fit the inner walls of the plug holes (29) adjacent to them. The lower end of the first plate (11) is elastically connected to the side wall of the first valve body (1) through a first protective bag (27), and the upper end of the second plate (13) is elastically connected to the inner wall of the first valve body (1) through a second protective bag (28). The slide rod (12) is located in the first protective bag (27) and the second protective bag (28). The temperature sensor (15), the first external control mechanism and the magnetic spring (32) are electrically connected to the second external control mechanism.

8. The precise temperature control stop valve for low temperature laboratory according to claim 2, characterized in that: A cleaning mechanism is provided in the first chamber (7), the cleaning mechanism comprising a circular plate (33) fixedly connected to the inner wall of the first chamber (7), a plurality of sector-shaped filter plates (34) uniformly distributed and fixedly connected to the side wall of the circular plate (33), an annular groove (35) is provided on the inner wall of the first chamber (7), a friction plate (36) that can rotate is slidably connected to the inner wall of the annular groove (35), the friction plate (36) is located between the circular plate (33) and the first semicircular plate (3), the side wall of the friction plate (36) away from the circular plate (33) is elastically connected to a permanent magnet plate (38) via a plurality of return springs (37), the side wall of the permanent magnet plate (38) is fixedly connected to a plurality of insertion rods (39), and the plurality of insertion rods (39) correspond one to one to the plurality of filter holes on the sector-shaped filter plate (34).

9. The precise temperature control stop valve for low temperature laboratory according to claim 8, characterized in that: The first semicircular plate (3) is provided with a driving mechanism, the driving mechanism comprising a one-way bearing (42), the outer ring side wall of the one-way bearing (42) is fixedly connected to the side wall of the friction plate (36), the inner ring side wall of the one-way bearing (42) is fixedly connected to a threaded ring (43), the side wall of the first semicircular plate (3) is rotatably connected to a crossbar (40), the side wall of the crossbar (40) located between the circular plate (33) and the first semicircular plate (3) is provided with a reciprocating thread (44), the reciprocating thread (44) is connected to a rifle rod (45), the side wall of the rifle rod (45) is threadedly connected to the inner wall of the threaded ring (43) during movement, the side wall of the first semicircular plate (3) is fixedly connected to two second rectangular rods (46), and the side walls of the two second rectangular rods (46) are both slidably connected to the side wall of the rifle rod (45).

10. The precise temperature control stop valve for low temperature laboratory according to claim 9, characterized in that: The crossbar (40) is fixedly connected to a side wall of the second valve body (2) with a plurality of axial flow blades (41), one of which is made of a magnetic material, and the permanent magnet plate (38) and the side wall of the axial flow blade (41) made of the magnetic material that is close to each other are attracted to each other.

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