High-efficiency stirring type chemical reaction kettle based on intelligent control
By using an intelligently controlled chemical reactor, combined with the design of a main agitator and a bottom agitator, the problems of insufficient catalyst suspension and temperature rise in the chemical reactor are solved, achieving efficient stirring and low-temperature reaction effects.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BAOJI LIUWEI SPECIAL MATERIAL & EQUIP PRODUCE CO LTD
- Filing Date
- 2023-04-17
- Publication Date
- 2026-07-24
AI Technical Summary
In existing chemical reactors, if the stirring speed is too low, the catalyst will not have sufficient contact with the process material. If the stirring speed is too high, the reaction efficiency will be low, the temperature will rise, and by-products will be generated. Furthermore, it is difficult to control the critical speed.
The chemical reactor adopts intelligent control and combines the design of a main agitator and a bottom agitator. The main agitator is an axial flow blade type, and the bottom agitator revolves around the main shaft and rotates on its own axis. Together with the revolving coordination ring and the chassis structure, it forms a local vortex, which enhances the catalyst suspension effect and guides the deposition of the catalyst through water jet.
Achieving sufficient catalyst suspension at lower rotational speeds avoids process material vaporization, reduces temperature rise, expands the critical rotational speed selection range, improves reaction efficiency, and reduces byproduct formation.
Smart Images
Figure CN116474690B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of process reactor technology, specifically to a high-efficiency stirred chemical reactor based on intelligent control. Background Technology
[0002] Chemical processes often require catalytic conditions and are typically carried out in a reaction vessel. During the reaction, stirring is usually necessary to ensure that the catalyst and the reactants are in full contact, maintaining maximum contact area for efficient reaction.
[0003] Ideally, the catalyst should be dispersed and completely suspended. The stirring speed at this point is the critical speed. If the stirring speed is lower than this value, some catalyst will stagnate at the bottom of the reactor and not make sufficient contact with the process material, affecting the catalytic reaction effect. If the stirring speed is too high, the process material moves too fast inside, the pressure decreases, and it may approach the saturated vapor pressure, causing some water to vaporize. The reaction environment of the process medium is no longer a pure liquid. The presence of bubbles prevents sufficient contact between components, and the catalyst also does not make sufficient contact with the process material, resulting in low reaction efficiency. Furthermore, excessively fast stirring speed will also lead to an increase in the temperature of the process material, deviating from the design temperature of the reaction, which also affects the reaction conditions, resulting in low reaction efficiency. In some organic reactions, it may even generate too many unwanted byproducts, causing waste and increasing the cost of subsequent separation and purification. Summary of the Invention
[0004] The purpose of this invention is to provide a high-efficiency stirred chemical reactor based on intelligent control, so as to solve the problems mentioned in the background art.
[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:
[0006] A high-efficiency stirred chemical reactor based on intelligent control includes a tank body, a motor, a main shaft, a main stirring wheel, and a bottom stirring wheel. The motor is located at the top of the tank body, and the main shaft is positioned downwards towards the inside of the tank body. The main stirring wheel and the bottom stirring wheel are respectively mounted on the main shaft. The main stirring wheel is an axial flow blade type stirring wheel, and the main stirring wheel pushes the material upwards. The bottom stirring wheel is located at the bottom end of the main shaft, and the bottom stirring wheel revolves around the main shaft and also rotates around its own horizontal axis.
[0007] After the process material and catalyst are added into the reactor, the main agitator pushes the suspended catalyst and the material upwards, keeping the catalyst at a higher position. The bottom agitator stirs the catalyst at the bottom of the tank, giving it the power to move upwards in the process material. The bottom agitator not only revolves around the main shaft, but also rotates on several horizontal axes, which can form several small vortices at the bottom of the tank, thereby enhancing the ability to encapsulate the catalyst.
[0008] The reactor also includes a revolution-aligning ring. The bottom agitator includes a bottom mounting base, a pressure sleeve, a core rod, a limiting end plate, and a gear. The bottom mounting base is fitted onto the main shaft and is connected to the main shaft drive. The core rod is arranged radially around the bottom mounting base. A limiting end plate and a gear are respectively set at both ends of the core rod. One end of the core rod with the upper limiting end plate is inserted into the bottom mounting base. The pressure sleeve is joined and fixed to the side wall of the bottom mounting base. The pressure sleeve presses against the limiting end plate along the radial direction of the main shaft. The revolution-aligning ring is installed on the inner wall of the tank. The revolution-aligning ring is provided with teeth centered on the main shaft. The gear meshes with the revolution-aligning ring.
[0009] The bottom agitator is semi-movably mounted on the main shaft. Only the bottom mounting base and pressure sleeve rotate synchronously with the main shaft and are relatively fixed. When the core rod is installed in the bottom mounting base through the limiting end platform, the axial freedom of the core rod is not limited. Therefore, the core rod is driven to revolve with the main shaft. Since the gear at its outer end meshes with the revolving positioning ring, it is equivalent to the gear rolling forward on the revolving positioning ring. Therefore, the core rod also has the ability to rotate around its own axis. The rotation of the core rod imparts a rotational amount to the surrounding water. The small-scale vortex drives the catalyst to suspend, while not generating a large-scale material migration velocity, preventing the absolute pressure of the process from dropping too much and approaching the saturated vapor pressure at the current temperature.
[0010] The orbital aligning ring is higher than the gear.
[0011] The lower surface of the orbital aligning ring meshes with the gear, which means that the rolling force of the gear is changed to its upper surface. Therefore, its rolling direction is opposite to that of a normal tire rolling on the ground. The core rod is equivalent to its lower edge having the same forward speed while moving forward, which can enhance the vortex of the liquid at that point and roll up the catalyst at the bottom.
[0012] The tank body includes an upper tank and a lower tank. The upper tank and the lower tank are axially aligned and fastened together. The upper tank is provided with a feed inlet at the top and the lower tank is provided with a discharge outlet at the bottom. The revolving positioning ring is provided on the inner wall of the lower tank and close to the upper edge of the lower tank. The upper tank is provided with a support on the side.
[0013] The tank has a split structure, which makes it easy to fix components such as the orbital positioning ring on the inner wall of the tank. It also allows the radial length of the main stirring wheel and the bottom stirring wheel to be unrestricted by the diameter of the insertion port of the motor installation position. The support is located in the middle of the whole device to provide support for the device and reduce the impact of dimensional changes caused by heat deformation during the stirring reaction.
[0014] The bottom agitator also includes agitator blades, which are arranged around the circumference of the core rod.
[0015] The stirring plate agitates the surrounding water as the core rod rotates, increasing the local vortex force, thus allowing the water to better entrain the catalyst deposited at the bottom of the tank.
[0016] The height of the agitator gradually changes along the length of the core rod, with the end of the agitator closer to the main shaft being higher than the end of the agitator farther from the main shaft.
[0017] The height of the agitator on the core rod varies to compensate for the difference in linear velocity caused by the different radii of its revolution around the main shaft. The agitator closer to the main shaft is higher, and the end farther from the main shaft is lower. The linear velocity at all positions is approximately equal, so the agitation force on the catalyst at the bottom of the tank is consistent. The catalyst floats and migrates upwards instead of gathering towards the center or towards the bottom periphery of the tank.
[0018] The reactor also includes a chassis, which is located at the bottom of the lower tank. The upper surface of the chassis has several circumferentially distributed and radially extending protrusions.
[0019] The chassis allows the bottom of the tank to be no longer a smooth, continuous surface, but rather a surface with bends. When the catalyst is deposited at this point, the agitation of the bottom stirring wheel can create small eddies that can lift the catalyst in a small area and suspend it. If the bottom of the tank is smooth, the bottom material disturbed by the bottom stirring wheel may only undergo a revolution around the main axis, and will not develop into local eddies that lift the catalyst.
[0020] A rotating support is also provided on the bottom surface of the lower tank, and the lower end of the main shaft is rotatably installed into the rotating support.
[0021] The lower end of the main shaft is also supported accordingly, and the double-end support prevents the main shaft from bending and deforming during the stirring reaction process.
[0022] The main agitator includes a main mounting base, blades, and a pressure plate. The main mounting base is sleeved on the main shaft and is connected to the main shaft via a drive. Several blades are evenly distributed around the main mounting base. The pressure plate is installed on the main mounting base and presses down the root of the blades.
[0023] The spindle has a core hole inside, and the blade has a water inlet hole inside. The water inlet hole extends from the working surface of the blade to the root of the blade. The main mounting base has a through hole connecting the water inlet hole and the core hole.
[0024] The core rod has a water outlet hole inside, which extends from the outer surface of the core rod to the end face of the limiting end platform. The bottom mounting base has a through hole connecting the water outlet hole and the core hole.
[0025] During the rotation of the main agitator, the liquid is compressed on the working surface and enters the inlet hole. The liquid flows downward along the core hole and then flows out from the outlet hole at the lower position. The power for this flow comes from the working surface of the blade facing the incoming flow, while there is always a vacuum zone on the core rod facing away from the incoming flow. Therefore, a portion of the water flow is always diverted separately from the height of the main agitator to the lower part of the tank to flush up the deposited catalyst. The diameter of the inlet and outlet holes can be set to be smaller than the particle size of the catalyst being agitated in this device, so that no catalyst particles enter the inlet hole.
[0026] Compared with the prior art, the beneficial effects achieved by the present invention are: by setting the stirring structure at multiple heights, the present invention can fully drive the process material and catalyst in all positions to move at a relatively small stirring speed, preventing catalyst deposition, while not requiring the working fluid in any position to have a large absolute velocity, thus preventing moisture vaporization.
[0027] The bottom agitator revolves around the bottom of the tank while also rotating on its own axis. In conjunction with the protrusions on the chassis, it generates several local eddies at the bottom of the tank, which lift up the catalyst that has settled to the bottom and suspend it. The main agitator also draws a stream of water from its working surface and transmits it to the bottom agitator via the main shaft. The water jet is used to help to flush up the deposited catalyst.
[0028] By using multiple structures to promote the suspension of the catalyst at the bottom of the tank, the critical speed of the device is reduced, and the speed selection range is increased. It is possible to visually determine whether the device has reached the critical speed, and then control the motor to reduce the speed value as much as possible while meeting the critical speed, thereby reducing the undesigned temperature rise during the stirring process. Attached Figure Description
[0029] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:
[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention;
[0031] Figure 2 yes Figure 1 View A in the middle;
[0032] Figure 3 This is a schematic diagram of the installation structure of the main stirring wheel and the bottom stirring wheel on the main shaft of the present invention;
[0033] Figure 4 yes Figure 3 View B in the middle;
[0034] Figure 5 This is a top view of the chassis of the present invention installed inside the lower tank;
[0035] In the diagram: 1-Tank body, 11-Upper tank, 12-Lower tank, 13-Inlet, 14-Outlet, 19-Support, 2-Motor, 3-Main shaft, 31-Core hole, 4-Main stirring wheel, 41-Main mounting base, 42-Blade, 43-Pressure plate, 49-Water inlet, 5-Bottom stirring wheel, 51-Bottom mounting base, 52-Pressure sleeve, 53-Core rod, 54-Limiting end platform, 55-Gear, 56-Agitating blade, 59-Water outlet, 6-Revolutionary positioning ring, 7-Chassis, 8-Rotating support. Detailed Implementation
[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0037] A high-efficiency stirred chemical reactor based on intelligent control includes a tank body 1, a motor 2, a main shaft 3, a main stirring wheel 4, and a bottom stirring wheel 5. The motor 2 is installed at the top of the tank body 1, and the main shaft 3 is installed downwards towards the inside of the tank body 1. The main stirring wheel 4 and the bottom stirring wheel 5 are respectively installed on the main shaft 3. The main stirring wheel 4 is an axial flow blade type stirring wheel, and the main stirring wheel 4 pushes the material upwards. The bottom stirring wheel 5 is located at the bottom end of the main shaft 3. The bottom stirring wheel 5 revolves around the main shaft 3 and also rotates around its own horizontal axis.
[0038] like Figure 1 , 2 As shown, after the process material and catalyst are added into the reactor, the main stirring wheel 4 pushes the suspended catalyst mixed with the material upward, maintaining the catalyst at a higher position. The bottom stirring wheel 5 is used to stir the catalyst at the bottom of the tank 1, giving it the power to move upward in the process material. The bottom stirring wheel 5 not only revolves around the main shaft 3, but also has several horizontal axis rotations, which can form several small vortices at the bottom of the tank 1, thereby enhancing the ability to encapsulate the catalyst.
[0039] The reactor also includes a revolution-alignment ring 6. The bottom stirring wheel 5 includes a bottom mounting base 51, a pressure sleeve 52, a core rod 53, a limiting end plate 54, and a gear 55. The bottom mounting base 51 is fitted onto the main shaft 3 and is connected to the main shaft 3 for transmission. The core rod 53 is arranged radially around the bottom mounting base 51. The limiting end plate 54 and the gear 55 are respectively set at both ends of the core rod 53. One end of the core rod 53 that is above the limiting end plate 54 is inserted into the bottom mounting base 51. The pressure sleeve 52 is joined and fixed to the side wall of the bottom mounting base 51. The pressure sleeve 52 presses the limiting end plate 54 radially along the main shaft 3. The revolution-alignment ring 6 is installed on the inner wall of the tank body 1. The revolution-alignment ring 6 is provided with teeth centered on the main shaft 3. The gear 55 meshes with the revolution-alignment ring 6.
[0040] like Figure 2 , 3 As shown, the bottom stirring wheel 5 is semi-movably mounted on the main shaft 3. Only the bottom mounting base 51 and the pressure sleeve 52 rotate synchronously with the main shaft 3 and are relatively fixed. When the core rod 53 is installed in the bottom mounting base 51 through the limiting end platform 54, the axial freedom of the core rod 53 is not limited. Therefore, the core rod 53 will be driven to revolve with the main shaft 3. Since the gear 55 set at its outer end meshes with the revolving positioning ring 6, it is equivalent to the gear 55 rolling forward on the revolving positioning ring 6. Therefore, the core rod 53 also has the ability to rotate around its own axis. The rotation of the core rod 53 gives the surrounding water a rotation amount. The small-range vortex drives the catalyst to be suspended, while not generating a large-range material migration speed, preventing the absolute pressure of the process from dropping too much and approaching the current temperature saturated vapor pressure.
[0041] The orbital coupling ring 6 is higher than gear 55.
[0042] like Figure 2 , 3 As shown, the lower surface of the orbital positioning ring 6 meshes with the gear 55, which means the rolling force point of the gear 55 is changed to its upper surface. Therefore, its rolling direction is opposite to the normal rolling direction of a tire on the ground. For example... Figure 2 In the case where the main shaft 3 rotates clockwise in the top view, the core rod 53 facing outwards from the paper rotates clockwise in the horizontal front view. The core rod 53 is moving forward while its lower edge also has the same forward speed, which can enhance the vortex of the liquid at that point and roll up the catalyst at the bottom.
[0043] Tank 1 includes an upper tank 11 and a lower tank 12. The upper tank 11 and the lower tank 12 are axially aligned and fastened together. The upper tank 11 is provided with a feed inlet 13 at the top and the lower tank 12 is provided with a discharge outlet 14 at the bottom. The orbital positioning ring 6 is provided on the inner wall of the lower tank 12 and close to the upper edge of the lower tank 12. The upper tank 11 is provided with a support 19 on the side.
[0044] like Figure 1As shown, the tank 1 has a split structure, which makes it convenient to fix components such as the orbital positioning ring 6 on the inner wall of the tank 1. It also allows the radial length of the main stirring wheel 4 and the bottom stirring wheel 5 to be unrestricted by the diameter of the insertion port of the motor 2 installation position. The support 19 provides support for the device in the middle position of the whole device, reducing the impact of dimensional changes caused by heat deformation during the stirring reaction.
[0045] The bottom stirring wheel 5 also includes stirring blades 56, which are arranged around the circumference of the core rod 53.
[0046] like Figure 3 As shown, the stirring plate 56 agitates the surrounding water during the rotation of the core rod 53, increasing the local vortex force, so that the water can better entrain the catalyst deposited at the bottom of the tank 1.
[0047] The height of the stirring plate 56 gradually changes along the length of the core rod 53, with the end of the stirring plate 56 closer to the main shaft 3 being higher than the end of the stirring plate 56 farther from the main shaft 3.
[0048] like Figure 2 , 3 As shown, the height of the stirring plate 56 on the core rod 53 varies, which can compensate for the difference in the linear velocity of the revolution caused by the different revolution radius of the main shaft 3. The stirring plate 56 closer to the main shaft 3 is high, and the end farther away from the main shaft 3 is low. The linear velocity at all positions is approximately equal, so the stirring force of the catalyst at the bottom of the tank 1 is consistent. The catalyst is suspended and migrated upwards instead of gathering towards the center or towards the bottom periphery of the tank.
[0049] The reactor also includes a chassis 7, which is located at the bottom of the lower tank 12. The upper surface of the chassis 7 has several circumferentially distributed and radially extending protrusions.
[0050] like Figure 5 As shown, the chassis 7 can make the bottom of the tank 1 no longer a smooth and continuous bottom surface, but a bottom surface with a bend. When the catalyst is deposited here, the stirring of the bottom stirring wheel 5 can stir up the catalyst in a small area with a small eddy, making it suspend. If the bottom of the tank 1 is smooth, the bottom process material disturbed by the bottom stirring wheel 5 may only perform a revolution around the main axis 3, and will not develop into local eddies that cause the catalyst to be lifted.
[0051] A rotating support 8 is also provided on the bottom surface of the lower tank 12, and the lower end of the main shaft 3 is rotatably installed in the rotating support 8.
[0052] like Figure 2 As shown, the lower end of the main shaft 3 is also supported accordingly, and the double-end support prevents the main shaft 3 from bending and deforming during the stirring reaction process.
[0053] The main stirring wheel 4 includes a main mounting base 41, blades 42, and a pressure plate 43. The main mounting base 41 is sleeved on the main shaft 3 and is connected to the main shaft 3 in a drive connection. Several blades 42 are evenly distributed around the main mounting base 41. The pressure plate 43 is installed on the main mounting base 41 and presses down the root of the blades 42.
[0054] The spindle 3 has a core hole 31 inside, and the blade 42 has a water inlet hole 49 inside. The water inlet hole 49 extends from the working surface of the blade 42 to the root of the blade 42. The main mounting base 41 has a through hole connecting the water inlet hole 49 and the core hole 31.
[0055] The core rod 53 is provided with a water outlet hole 59, which extends from the outer surface of the core rod 53 to the end face of the limiting end platform 54. The bottom mounting base 51 is provided with a through hole connecting the water outlet hole 59 and the core hole 31.
[0056] like Figure 3 , 4 As shown, during the rotation of the main stirring wheel 4, the liquid is compressed on the working surface and enters the water inlet 49. The liquid flows downward along the core hole 31 and then flows out from the lower water outlet 59. The power for this flow comes from the working surface of the blade 42 facing the incoming flow, while there is always a vacuum area on the core rod 53 facing away from the incoming flow. Therefore, a portion of the water flow is always separately guided from the height of the main stirring wheel 4 to the lower part of the tank 1 to flush up the deposited catalyst. The diameter of the water inlet 49 and the water outlet 59 can be set to be small, smaller than the particle size of the catalyst being stirred in this device, so that no catalyst particles enter the water inlet 49.
[0057] 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.
[0058] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended 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 described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A high-efficiency stirred chemical reactor based on intelligent control, characterized in that: The reactor includes a tank body (1), a motor (2), a main shaft (3), a main stirring wheel (4), and a bottom stirring wheel (5). The motor (2) is installed on the top of the tank body (1). The main shaft (3) is installed downwards towards the inside of the tank body (1). The main stirring wheel (4) and the bottom stirring wheel (5) are respectively installed on the main shaft (3). The main stirring wheel (4) is an axial flow blade type stirring wheel. The main stirring wheel (4) pushes the material upwards. The bottom stirring wheel (5) is located at the bottom end of the main shaft (3). The bottom stirring wheel (5) revolves around the main shaft (3) and also rotates around the horizontal axis. The reactor also includes a revolving coordination ring (6), and the bottom stirring wheel (5) includes a bottom mounting base (51), a pressure sleeve (52), a core rod (53), a limiting end plate (54), and a gear (55). The bottom mounting base (51) is fitted onto the main shaft (3) and is connected to the main shaft (3) for transmission. The core rod (53) is arranged radially around the bottom mounting base (51), and the two ends of the core rod (53) are respectively provided with a limiting end plate (54) and a gear (55). 5) One end of the limiting end plate (54) on the core rod (53) is inserted into the bottom mounting base (51). The pressure sleeve (52) is fixed to the side wall of the bottom mounting base (51). The pressure sleeve (52) presses the limiting end plate (54) radially along the main shaft (3). The revolution positioning ring (6) is installed on the inner wall of the tank body (1). The revolution positioning ring (6) is provided with teeth centered on the main shaft (3). The gear (55) meshes with the revolution positioning ring (6).
2. The high-efficiency stirred chemical reactor based on intelligent control according to claim 1, characterized in that: The orbital aligning ring (6) is higher than the gear (55).
3. The high-efficiency stirred chemical reactor based on intelligent control according to claim 2, characterized in that: The tank body (1) includes an upper tank (11) and a lower tank (12). The upper tank (11) and the lower tank (12) are axially aligned and fastened together. The upper tank (11) is provided with a feed inlet (13) at the top. The lower tank (12) is provided with a discharge outlet (14) at the bottom. The orbital positioning ring (6) is provided on the inner wall of the lower tank (12) and close to the upper edge of the lower tank (12). The upper tank (11) is provided with a support (19) on its side.
4. The high-efficiency stirred chemical reactor based on intelligent control according to claim 3, characterized in that: The bottom stirring wheel (5) also includes stirring blades (56), which are arranged around the circumference of the core rod (53).
5. A high-efficiency stirred chemical reactor based on intelligent control according to claim 4, characterized in that: The height of the agitator (56) gradually changes along the length of the core rod (53), and the end of the agitator (56) closer to the main shaft (3) is higher than the end of the agitator (56) farther away from the main shaft (3).
6. The high-efficiency stirred chemical reactor based on intelligent control according to claim 3, characterized in that: The reactor also includes a chassis (7), which is located at the bottom of the lower tank (12). The upper surface of the chassis (7) has several circumferentially distributed and radially extended protrusions.
7. A high-efficiency stirred chemical reactor based on intelligent control according to claim 3, characterized in that: The bottom surface of the lower tank (12) is also provided with a rotating support (8), and the lower end of the main shaft (3) is rotatably installed in the rotating support (8).
8. The high-efficiency stirred chemical reactor based on intelligent control according to claim 1, characterized in that: The main stirring wheel (4) includes a main mounting base (41), blades (42), and a pressure plate (43). The main mounting base (41) is sleeved on the main shaft (3) and is connected to the main shaft (3) in a transmission manner. Several blades (42) are evenly distributed around the main mounting base (41). The pressure plate (43) is installed on the main mounting base (41) and presses down on the root of the blades (42). The spindle (3) is provided with a core hole (31) inside, and the blade (42) is provided with a water inlet hole (49) inside. The water inlet hole (49) extends from the working surface of the blade (42) to the root of the blade (42). The main mounting base (41) is provided with a through hole connecting the water inlet hole (49) and the core hole (31). The core rod (53) is provided with a water outlet hole (59) inside. The water outlet hole (59) extends from the outer surface of the core rod (53) to the end face of the limiting end platform (54). The bottom mounting base (51) is provided with a through hole connecting the water outlet hole (59) and the core hole (31).