An external water mixing device for a tokamak test device and a method of use

Abstract

The application relates to the field of new energy and energy-saving technology, in particular to an external water mixing device for a TOKAMAK test device and a use method, which comprises a cooling water inlet pipe, a refrigerated water inlet pipe, a water mixing tank, a water falling plate, an intermediate water tank and a water mixing tank, the cooling water inlet pipe and the refrigerated water inlet pipe are both communicated with the upper side of the water mixing tank, a water distribution plate is arranged below the central part of the water mixing tank; the water outlet of the bottom of the water mixing tank is communicated with the water inlet of the top of the water mixing tank, a water mixing compartment is arranged below the inside of the water mixing tank, the water outlet of the water mixing compartment is connected with external equipment; the intermediate water tank is arranged below the water inlet in the inside of the water mixing tank, and the intermediate water tank is arranged above the inner wall of the water mixing tank; the intermediate water tank comprises the water falling plate, the water falling plate is arranged below the water inlet of the water mixing tank; and the water outlet of the intermediate water tank is communicated with the water mixing compartment. The two fluids of cooling water and refrigerated water are mixed multiple times outside and inside the water tank to realize temperature reduction and stabilize the water temperature fluctuation of the water tank.

Description

Technical Field

[0001] This invention relates to the field of new energy and energy-saving technology, specifically to an external mixing device and its usage method for the TOKAMAK test apparatus. Background Technology

[0002] The Tokamak device uses a dual-loop cooling coil, namely the cooling water loop on the test device side and the chilled water loop on the cold source side. The existing technology uses a rectangular water tank directly connected to the cooling water and chilled water loops to achieve the mixing of cooling water and chilled water for cooling and reduce water temperature fluctuations. However, the following problems exist: the uniformity of the mixing of the return water from the chilled water loop and the cooling water on the test device side in the water tank directly affects the heat storage capacity of the water tank. If the cooling water (hot water) and chilled water (cold water) are not mixed evenly, the following problems occur: (1) the limited water volume is insufficient for heat storage, and the capacity of the water tank and its water storage volume need to be increased; (2) water with a temperature exceeding 22°C in the water tank is sucked into the refrigeration device, causing the refrigeration device to shut down for protection.

[0003] A stirring device can be installed at the top of the water tank to promote the mixing of cooling water (hot water) and chilled water (cold water) by increasing the disturbance of the water flow. However, the following problems exist: the stirring device causes additional load and vibration, requiring the water tank to be reinforced; it consumes additional electrical energy; the pressure and kinetic energy provided by the water pump during fluid flow can be unused; and additional equipment investment is required. Summary of the Invention

[0004] To address the problems of uneven water mixing and low energy utilization in existing technologies, this invention provides an external water mixing device and its usage method for the TOKAMAK test apparatus, so as to achieve effective and uniform water mixing, heat storage, and cooling technology between the cooling water circuit and the chilled water circuit of the CTRFR device (a type of TOKAMAK) water-cooled coil.

[0005] This invention is achieved through the following technical solution:

[0006] It includes a cooling water inlet pipe, a chilled water inlet pipe, a mixing tank, an intermediate water tank, and a mixing water reservoir. The cooling water inlet pipe and the chilled water inlet pipe are coaxially and symmetrically arranged on both sides of the mixing tank and are connected to the inside of the mixing tank. The diameter of the cooling water inlet pipe is smaller than that of the chilled water inlet pipe. Both the cooling water inlet pipe and the chilled water inlet pipe are equipped with valves to regulate the flow rate of the cooling water and chilled water to ensure that the water flow collision occurs on the axis of the vertical geometric center of the mixing tank.

[0007] The mixing tank is equipped with a water distribution plate inside, and the water replenishment plate is located on the vertical axis of the mixing tank; the top of the water distribution plate is lower than the lowest point of the chilled water inlet pipe; the bottom outlet of the mixing tank is connected to the top inlet of the mixing water tank.

[0008] The mixing tank is equipped with an intermediate water trough and a mixing chamber arranged vertically inside. The intermediate water trough is arranged around the upper part of the inner wall of the mixing tank. The intermediate water trough is located below the water inlet of the mixing tank and above the water level line of the mixing tank. The intermediate water trough includes a connected drop plate, a water collection trough, a connecting trough and a transition trough. The drop plate is located below the water inlet of the mixing tank. A triangular fork pipe bundle is installed at the water outlet of the connecting trough. A baffle is also installed at the water outlet of the transition trough. A water flow channel is left between the baffle and the transition trough.

[0009] The mixing chamber includes a first mixing chamber, a second mixing chamber, and a flow equalization chamber. The inlet of the first mixing chamber is connected to the outlet of the transition tank. A first outlet is provided between the first mixing chamber and the second mixing chamber for connection. A second outlet is provided between the second mixing chamber and the flow equalization chamber for connection. A water outlet is provided at the bottom of the flow equalization chamber and is connected to external equipment.

[0010] Preferably, the top of the mixing tank is provided with a connecting rod, one end of which is fixedly connected to the water distribution plate, and the other end is connected to the top of the mixing tank.

[0011] Preferably, the top of the mixing tank is provided with a fastening structure, and the end of the connecting rod away from the water distribution plate extends out of the top of the mixing tank and is connected to the fastening structure, which is used to lock the position of the connecting rod.

[0012] Preferably, the water distribution plate is circular, and the axis of the water distribution plate is coaxial with the central axis of the mixing tank.

[0013] Preferably, an adjustment device is also provided at the outlet of the transition channel, which is used to adjust the up and down position of the baffle plate.

[0014] Preferably, the diameter of the first water outlet is smaller than the diameter of the second water outlet.

[0015] Preferably, the mixing tank is provided with a first partition and a second partition, which divide the mixing tank into a first mixing chamber, a second mixing chamber and a flow equalization chamber connected in sequence. The bottom of the first partition is provided with a first water outlet; the top of the second partition is provided with a second water outlet; and the bottom of the drop plate is in contact with the top of the second partition.

[0016] Preferably, a connecting pipe is provided between the second mixing chamber and the equalization chamber. The connecting pipe is located outside the mixing tank and a gate valve is provided on the connecting pipe. The gate valve is in the open state when water is injected.

[0017] Preferably, a balancing pipe is provided between the mixing tank and the mixing reservoir.

[0018] A method of using an external mixing device for a TOKAMAK test apparatus includes the following steps:

[0019] S1, turn on the water pumps and valves of the cooling water inlet pipe and the chilled water inlet pipe, and the water flows into the mixing tank for the first mixing, forming a primary mixed water flow;

[0020] S2, the first mixed water flow falls onto the water distribution plate, performs a water jump, and undergoes a second mixing to form a secondary mixed water flow;

[0021] S3, the secondary mixed water flow falls into the mixing tank after passing through the water distribution plate, and undergoes a third free mixing inside the mixing tank to form a tertiary mixed water flow;

[0022] S4, the three-stage mixed water flow enters the intermediate water tank, and is mixed multiple times in sequence through the drop plate, water collection tank, connecting tank and transition tank, and backwater is generated at the outlet of the transition tank, forming a four-stage mixed water flow;

[0023] S5, the four mixed water flows into the mixing tank, first into the first mixing chamber, then into the second mixing chamber through the first outlet, then into the equalization chamber through the second outlet, and finally out through the water outlet at the bottom of the equalization chamber.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] This invention discloses an external mixing device for a Tokamak test apparatus. It utilizes a water tank for heat storage and cooling, connecting the cooling water circuit and the chilled water circuit on the refrigeration side. Taking advantage of the pressure and kinetic energy (provided by their respective circulating pumps) and the turbulent flow of the fluids in the cooling and chilled water circuits, the two fluids (chilled water and cooling water) are sequentially introduced into a mixing tank, a distribution plate, an intermediate water tank, and the mixing tank. Multiple external disturbances are applied to the two fluids inside the mixing tank, open channel trough, and water tank to achieve thorough mixing. The mixing process, characterized by turbulent flow due to the pressure and kinetic energy of the fluids in the cooling and chilled water circuits, is achieved by applying disturbances and impacts, transforming the flow within the pipes into open channel flow. Hydraulic phenomena such as hydraulic jumps, tube bundle flow around, and water backflow further agitate the flow, achieving the mixing effect. This provides conditions for reducing the cooling capacity of the refrigeration unit and ensures the normal operation of the Tokamak cooling water system. Compared to simple water tank mixing, it has higher mixing efficiency and more uniform mixing, resulting in greater heat storage for the same volume of water; and the cooling effect is significant. Compared to water tank mixing with a stirring device, its advantages go beyond just increasing the tank volume. Furthermore, it consumes no additional electrical energy, utilizing the pressure and kinetic energy of the fluids in the cooling water and chilled water circuits to mix the cooling water and chilled water, effectively utilizing the pressure and kinetic energy provided by the pump during flow.

[0026] Furthermore, the connecting rod and fastening structure work together to adjust the height of the water distribution plate. Rotating the connecting screw will cause the water distribution plate to move up and down inside the mixing tank.

[0027] Furthermore, the circular water distribution plate is designed to ensure a consistent water flow rate. After the water impacts the surface, it is evenly distributed to the surrounding area from the distribution plate before falling into the bottom of the mixing tank and entering the central water trough for subsequent mixing.

[0028] Furthermore, the water flows onto the drop plate, creating a hydraulic jump and mixing simultaneously. After falling into the drop plate, the cooling water enters the rectangular storage tank, forming an open channel flow. Subsequently, the water flows sequentially through the sloping collection trough and transition trough before entering the mixing tank.

[0029] Furthermore, the triangular fork tube bundle implements a third disturbance and mixing of the water flow. When the water flow passes over the triangular fork tube bundle for heat exchange, the stronger the disturbance, the greater the heat transfer coefficient. Similarly, the stronger the external disturbance, the more significant the fluid mixing effect, which can enhance the thorough mixing of chilled water and cooling water.

[0030] Furthermore, the outlet of the transition channel is equipped with a baffle plate and a regulating device. The water flow is accelerated in the collection channel and the transition channel. The baffle plate can create a stable backwater phenomenon upstream of the outlet of the transition channel due to the height of the baffle plate, so as to achieve full mixing of the water flow. Downstream, a stable outflow is formed (the water flows into the mixing tank through the gap below the baffle plate).

[0031] Furthermore, the first and second partitions separate the interior of the mixing tank, which can enhance the disturbance while preventing the spread of water temperature caused by the convection flow of the cooling water, thus preventing high-temperature water from being sucked into the water pump and entering the refrigeration unit or test equipment. The cooling water that has been mixed in the middle water tank first enters the first mixing chamber, then enters the second mixing chamber through the first water outlet at the bottom of the first partition, and then enters the flow equalization chamber through the second water outlet at the top of the second partition. Finally, it flows out from the water outlet at the bottom of the flow equalization chamber.

[0032] Furthermore, the connecting pipe is used to prevent uneven stress between the second mixing chamber and the equalization chamber, and the gate valve is closed when the water tank is filled.

[0033] Furthermore, balancing pipes are used to ensure that the internal pressure of the mixing tank and the mixing vessel is the same. Attached Figure Description

[0034] Figure 1 This is a vertical cross-sectional view of the connection between the mixing tank and the water tank in an external mixing device for a TOKAMAK test apparatus according to the present invention.

[0035] Figure 2 This is a top view of the open channel section of the water tank 3.0m from the bottom of the mixing tank in the external mixing device of the TOKAMAK test apparatus according to the present invention;

[0036] Figure 3This is a diagram showing the arrangement of equally spaced branched tube bundles in an open channel trough in an external mixing device for a TOKAMAK test apparatus according to the present invention.

[0037] Figure 4 This is a cross-sectional view of the water backflow at the baffle plate and the outflow below the gate in an external mixing device for a TOKAMAK test apparatus according to the present invention.

[0038] Figure 5 This is a cross-sectional view of the mixing chamber and water flow direction in the mixing tank of an external mixing device for a TOKAMAK test apparatus according to the present invention.

[0039] Figure 6 This is a schematic diagram of the mixing principle of an external mixing device for a TOKAMAK test apparatus according to the present invention.

[0040] Figure 7 This is a flow diagram of the connection between the mixing tank and the water tank in an external mixing device for a TOKAMAK test apparatus according to the present invention.

[0041] Figure 8 This is a schematic diagram of the flow inside the mixing tank of an external mixing device for a TOKAMAK test apparatus according to the present invention.

[0042] In the diagram, 1. Cooling water inlet pipe; 2. Chilled water inlet pipe; 3. Mixing tank; 4. Intermediate water tank; 5. Mixing water reservoir; 6. Water distribution tray; 7. Connecting rod; 8. Water drop tray; 9. Water collection trough; 10. Transition trough; 11. Connecting trough; 12. Connecting pipe; 13. Forklift pipe bundle; 14. Water baffle; 15. First partition; 16. Second partition; 17. First mixing chamber; 18. Second mixing chamber; 19. Flow equalization chamber; 20. Observation hole; 21. Vent connection pipe interface. Detailed Implementation

[0043] The present invention will be further described in detail below with reference to specific embodiments. The 10 mentioned is an explanation of the present invention and not a limitation thereof.

[0044] This invention discloses an external mixing device for the TOKAMAK test apparatus, referring to... Figure 1The system includes a cooling water inlet pipe 1, a chilled water inlet pipe 2, a mixing tank 3, an intermediate water tank 4, and a mixing water reservoir 5. Both the cooling water inlet pipe 1 and the chilled water inlet pipe 2 are connected to the top of the mixing tank 3. The diameter of the cooling water inlet pipe 1 is smaller than the diameter of the chilled water inlet pipe 2, and the axis of the cooling water inlet pipe 1 is coaxial with the axis of the chilled water inlet pipe 2. Both the cooling water inlet pipe 1 and the chilled water inlet pipe 2 are equipped with pumps and valves. The pumps provide power for water circulation, and the valves ensure that the water flow collision occurs on the axis of the vertical geometric center of the mixing tank 3 (i.e., directly above the geometric center of the water distribution plate 6). In this embodiment, the mixing tank 3 includes an open tank body and a top plate. The cooling water inlet pipe 1 and the chilled water inlet pipe 2 are symmetrically arranged on both sides of the open tank body and are connected to the interior of the open tank body. The top plate is fixed to the opening of the open tank body by bolts. The inlet flow rate of the chilled water inlet pipe 2 is 56 m³ / h. 3 / h, using D133×4 seamless steel pipe, flow velocity: 1.27m / s; corresponding Reynolds number: 85219 (20℃, kinematic viscosity of water 1.011×10⁻⁶). -6 m 2 / s), the flow rate of cooling water inlet pipe 1 is 16.8m³ / s. 3 / h, when the main pipe diameter is reduced to D76×6.5, the flow velocity is 1.25m / s and the Reynolds number is 156803; when the centers of the outlets of cooling water inlet pipe 1 and chilled water inlet pipe 2 are directly opposite each other and the distance between them is 0.4m, the water flow converges and causes water flow impact at 0.126m below the midpoint of the outlet of the two pipes.

[0045] Four observation holes 20, each with a specification of M48×100, are provided on the top plate to facilitate observation of the water flow impact position and water distribution uniformity inside the mixing tank 3 during initial commissioning or maintenance. During normal operation of the mixing tank 3, the observation holes 20 are sealed with bolts.

[0046] The side wall of the open tank is also provided with a vent connection pipe interface 21, which is DN20, to connect the mixing tank 3 and the mixing water tank 5 to maintain the internal pressure of the mixing tank 3 and the mixing water tank 5 equal.

[0047] A circular water distribution plate 6 is provided at the bottom of the open tank body of the mixing tank 3. The water distribution plate 6 is located below the lowest point of the chilled water inlet pipe 2, and the axis of the water distribution plate 6 is coaxial with the central axis of the mixing tank 3. In this embodiment, the water distribution plate 6 is located 150mm below the axial geometric axis of the mixing tank 3 and about 0.03m below the water flow confluence. The diameter of the water distribution plate 6 is D300 and the thickness is 5mm. After the water flow impacts, the water is evenly distributed to the surrounding area from the water distribution plate 6 and then falls into the bottom of the mixing tank 3 and enters the middle water tank 4.

[0048] A connecting rod 7 is provided on the top of the mixing tank 3. One end of the connecting rod 7 is fixedly connected to the water distribution plate 6, and the other end is connected to the top of the mixing tank 3. A fastening structure is provided on the top of the mixing tank 3. The end of the connecting rod 7 away from the water distribution plate 6 extends out of the top of the mixing tank 3 and is connected to the fastening structure. In this embodiment, the connecting rod 7 is a lead screw with a specification of D16. The lead screw nut is fixed to the top plate of the mixing tank 3 by welding or screws. One end of the lead screw is fixedly connected to the water distribution plate 6, and the other end is threadedly connected to the lead screw nut. The threaded structure serves as the fastening structure, achieving self-locking. Rotating the lead screw allows adjustment of the height position of the water distribution plate 6 in the mixing tank 3. The fastening structure can also be a snap-fit ​​structure, a pin structure, or a damped fixing structure, allowing for the disassembly and fixation of the connecting rod 7.

[0049] The bottom outlet of the mixing tank 3 is connected to the top inlet of the mixing tank 5 via a connecting pipe 12. The mixing tank 5 contains a central water trough 4 and a mixing chamber arranged vertically. The central water trough 4 is positioned around the upper part of the inner wall of the mixing tank 5. (Refer to...) Figure 2 The intermediate water tank 4 includes a drop basin 8, a water collection tank 9, a connecting tank 11, and a transition tank 10 connected in sequence. The drop basin 8 is located below the inlet of the mixing tank 5. Both the water collection tank 9 and the transition tank 10 are sloped, with the slope of the water collection tank 9 starting at the outlet of the drop basin 8, and the slope of the transition tank 10 starting at the outlet of the connecting tank 11. In this embodiment, the mixed cooling water flow rate is 72.8 m³ / s. 3 / h; After a sudden contraction, the flow enters the D109×4.5 connecting pipe 12 at a velocity of 2.58 m / s, with a corresponding Reynolds number of 254805. The slope of the water collection tank 9 is less than that of the transition tank 10. In this embodiment, the slope of the water collection tank 9 is 0.031, and the slope of the transition tank 10 is 0.050.

[0050] Reference Figure 3 A triangular fork pipe bundle 13 is installed at the outlet of the connecting trough 11. Water flows onto the drop plate 8, forming a hydraulic jump and mixing simultaneously. Cooling water, after falling into the drop plate, enters a rectangular drop plate made of stainless steel, forming an open channel flow. An optimal rectangular cross-section is adopted, where the bottom width is twice the water depth. Based on the basic formula for uniform flow in open channels in fluid mechanics, calculations show that with a hydraulic gradient of 37‰, a rectangular cross-section with a bottom width of 150mm and a water depth of 75mm corresponds to a flow velocity of 1.80m / s. The water tank cross-section dimensions are selected as 150×150mm.

[0051] When the water flow passes over the triangular branch pipe bundle 13, the stronger the disturbance, the more significant the fluid mixing effect. When the flow velocity is 1.80 m / s, the triangular branch circular pipe bundles with equal spacing are arranged at the outlet of the connecting groove 11, and the pipe spacing S is greater than 1.25 times the diameter of the circular pipe. The diameter of the circular pipe bundle is 10 mm, and the pipe spacing S is twice the diameter of the circular pipe. The corresponding Reynolds number is 177780. The triangular branch pipe bundle 13 disturbs the water flow in the water tank to achieve mixing.

[0052] Reference Figure 4 An adjusting device and a baffle plate 14 are provided at the outlet of the transition channel 10. The adjusting device is used to adjust the vertical position of the baffle plate 14. In this embodiment, the adjusting device includes a gantry and fixing bolts. The gantry is fixedly installed at the outlet of the transition channel 10. The left and right ends of the baffle plate 14 are slidably disposed in the sliding grooves opened on both sides of the gantry. The fixing bolts pass through the gantry to press the baffle plate 14 against the sliding grooves. The adjusting device can also be a roller shutter structure, a gear and rack structure, or other structures that can realize the vertical adjustment and locking of the baffle plate 14. The adjusting device and the baffle plate 14 cooperate to achieve flow disturbance and mixing through water backing. The flow backing and the height of the backing in the transition channel 10 cannot be accurately calculated. A baffle plate 14 is set at the end of the transition channel 10. The water level rise is observed to determine whether the water flow is stable and whether the water overflows the channel by adjusting the height of the baffle plate 14.

[0053] The lower part of the mixing tank 5 is the mixing chamber. The outlet of the middle water tank 4 is connected to the mixing chamber, meaning the outlet of the transition tank 10 is connected to the inlet of the mixing chamber. (Refer to...) Figure 2 , 5 The mixing chamber is internally equipped with a first partition 15 and a second partition 16. The mixing chamber is divided into a first mixing chamber 17, a second mixing chamber 18, and a flow equalization chamber 19, which are sequentially connected and of equal volume. The first mixing chamber 17 is connected to the outlet of the transition tank 10. The first partition 15 is located between the first mixing chamber 17 and the second mixing chamber 18, and has a first outlet hole at its bottom. The second partition 16 is located between the second mixing chamber 18 and the flow equalization chamber 19, and has a second outlet hole at its top. The water outlet is located at the bottom of the flow equalization chamber 19 and is connected to external equipment. The water flow, after being mixed in the intermediate water tank 4, first enters the first mixing chamber 17, then enters the second mixing chamber 18 through the first outlet hole at the bottom of the first partition 15, and then enters the flow equalization chamber 19 through the second outlet hole at the top of the second partition 16. Finally, it flows out through the water outlet at the bottom of the flow equalization chamber 19.

[0054] In this embodiment, the water storage capacity of the mixing tank 5 is calculated based on the allowable variation range of the inlet water temperature of the test device and the inlet water temperature of the refrigeration device. The mixing tank 5 is designed, selected, and manufactured according to the standard drawing 12S101 "Rectangular Water Supply Tank," and no reinforcement design is required for the mixing tank 5. The internal dimensions of the mixing tank 5 are 1.5m × 1m × 3.5m, and the minimum capacity requirement is achieved when the water depth inside the tank is 2.624m. The partition separates the mixing chamber, which, while enhancing the disturbance, prevents the water temperature from being transmitted due to the convection flow of the cooling water, and prevents high-temperature water from being sucked into the water pump and entering the refrigeration device or test device.

[0055] Both the first and second water outlets are arranged in an array, and the diameter of the first water outlet is smaller than that of the second water outlet. In this embodiment, there are 407 water outlets at the top, arranged in 11 rows and 37 columns, with a flow velocity of 0.4393 m / s; there are 333 water outlets at the bottom, arranged in 9 rows and 33 columns, with a flow velocity of 0.7732 m / s. The longitudinal spacing of the bottom water outlets is 25 mm, and the transverse spacing is 50 mm.

[0056] The bottom of the drop basin 8 contacts the top of the second partition 16, which can also support and fix the middle water tank.

[0057] A connecting pipe is installed between the second mixing chamber 18 and the equalization chamber 19. The connecting pipe is located outside the mixing tank 5 and a gate valve is installed on the connecting pipe. When water is being added, the gate valve is in the open state; when the tank is running, the gate valve is in the closed state. The connecting pipe is used to prevent uneven force between the mixing chamber 2 and the equalization chamber 19. The gate valve is closed when the tank is filled with water.

[0058] A balancing pipe is installed between the mixing tank 3 and the mixing water tank 5 to ensure that the internal pressure of the mixing tank 3 and the mixing water tank 5 is the same.

[0059] Reference Figure 6 , 7 8. The present invention provides an external water mixing device for a TOKAMAK test apparatus. This device connects the cooling water and chilled water circuits of the device's water-cooling coil, stores water in the water tank, and effectively absorbs the 51.84 MJ of heat released instantaneously (5s) by the test apparatus in the form of water heat storage. The water mixing cools down and stabilizes the water temperature, reduces water temperature fluctuations, and achieves water mixing cooling and temperature reduction.

[0060] The water flow process involves five mixing processes (impact, water jump, water drop, water backlog, disturbance of the equally spaced cross-braced pipe bundle, and mixing of outflow from the gate), as follows: (1) Chilled water and cooling water impact each other in the mixing tank 3, causing the fluid to undergo the first turbulent mixing; (2) After the chilled water and cooling water are mixed in the mixing tank 3, they flow into the drop plate 8 set inside the water tank through the vertical pipe, forming a hydraulic jump phenomenon, causing the fluid to undergo the second mixing; (3) The cooling water in the drop plate 8 flows into the water tank to form an open channel flow, and the third mixing is achieved by disturbance of the equally spaced cross-braced pipe bundle 13 in the open channel; (4) The fourth mixing is achieved by forming a water backlog and outflow from the gate at the end of the open channel; (5) The fluid outflow from the gate enters the water tank to achieve the fifth mixing.

[0061] This invention provides an external mixing device for a TOKAMAK test apparatus. Together with the chilled water circulation loop on the cold source side and the cooling water circulation loop on the test apparatus side, it achieves cooling and temperature reduction of the water-cooled coil cooling water in the (Tokamak) apparatus, reducing water temperature fluctuations. This provides a readily available commercially available single-cooling air-cooled modular unit as the cold source and effectively reduces the cooling capacity of the air-cooled modular unit in the cooling water system. It can achieve the required inlet water temperature of 20±2℃ for the CTRFR test apparatus.

[0062] This invention also discloses a method of using an external mixing device for a TOKAMAK test apparatus, referring to... Figure 6 , 7 8. This includes the following steps:

[0063] S1, turn on the water pumps and valves of cooling water inlet pipe 1 and chilled water inlet pipe 2, and the water flows into the mixing tank 3 for the first mixing, forming a primary mixed water flow;

[0064] S2, the first mixed water flow falls onto the water distribution plate 6, performs a water jump, and undergoes a second mixing to form a secondary mixed water flow;

[0065] S3, the secondary mixed water flow falls into the mixing tank 3 after passing through the water distribution plate 6, and undergoes a third free mixing inside the mixing tank 3 to form a tertiary mixed water flow;

[0066] S4, the three-stage mixed water flow enters the intermediate water tank 4, and is mixed multiple times through the drop plate 8, the water collection tank 9, the connecting tank 11 and the transition tank 10 in sequence, and backwater is generated at the outlet of the transition tank 10, forming a four-stage mixed water flow.

[0067] S5, the four mixed water flows into the mixing tank 5, first into the first mixing chamber 17, then into the second mixing chamber 18 through the first water outlet at the bottom of the first partition 15, then into the flow equalization chamber 19 through the second water outlet at the top of the second partition 16, and finally out through the water outlet at the bottom of the flow equalization chamber 19.

[0068] This invention achieves cooling and maintains a constant water temperature by mixing high-temperature chilled water generated by an artificial cold source with hot water (cooling water) generated during the test operation of the experimental device. This ensures the continuous and stable operation of the experimental device. It can solve the problem of unsteady heat release and near-steady cooling of the thermodynamic system by using constant flow rate in fluid mechanics. That is, the thermodynamic unsteady loop of the cooling water circuit on the experimental device side and the near-steady loop of the chilled water circuit on the cold source side are separated and coupled by a cooling water tank. This allows the unsteady side cooling water circulation pipeline and the near-steady cold source side cooling water circulation pipeline to work independently without pressure interference between them, ensuring constant flow rate operation of the cooling water circuit on the experimental device side and the chilled water circuit on the cold source side.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the technical solution of the present invention in any way. Those skilled in the art should understand that, without departing from the spirit and principles of the present invention, the technical solution can be modified and replaced in several simple ways, and these modifications and replacements are all within the scope of protection covered by the claims.

Claims

1. An external mixing device for a TOKAMAK test apparatus, characterized in that, It includes a cooling water inlet pipe (1), a chilled water inlet pipe (2), a mixing tank (3), an intermediate water tank (4), and a mixing water tank (5). The cooling water inlet pipe (1) and the chilled water inlet pipe (2) are coaxially and symmetrically arranged on both sides of the mixing tank (3) and are connected to the inside of the mixing tank (3). The diameter of the cooling water inlet pipe (1) is smaller than the diameter of the chilled water inlet pipe (2). Both the cooling water inlet pipe (1) and the chilled water inlet pipe (2) are equipped with valves. The valves are used to adjust the flow rate of the cooling water and chilled water to ensure that the water flow collision occurs on the axis of the vertical geometric center of the mixing tank (3). The mixing tank (3) is equipped with a water distribution plate (6) inside, which is located on the vertical axis of the mixing tank (3); the top of the water distribution plate (6) is lower than the lowest position of the chilled water inlet pipe (2); the bottom outlet of the mixing tank (3) is connected to the top inlet of the mixing water tank (5); The mixing tank (5) is provided with an intermediate water trough (4) and a mixing chamber arranged vertically inside. The intermediate water trough (4) is arranged around the upper part of the inner wall of the mixing tank (5). The intermediate water trough (4) is located below the water inlet of the mixing tank (5) and above the water level line of the mixing tank (5). The intermediate water trough (4) includes a connected drop plate (8), a water collection trough (9), a connecting trough (11) and a transition trough (10). The drop plate (8) is located below the water inlet of the mixing tank (5). A triangular fork pipe bundle (13) is provided at the water outlet of the connecting trough (11). A baffle plate (14) is also provided at the water outlet of the transition trough (10). A water flow channel is left between the baffle plate (14) and the transition trough (10). The mixing chamber includes a first mixing chamber (17), a second mixing chamber (18), and a flow equalization chamber (19). The inlet of the first mixing chamber (17) is connected to the outlet of the transition tank (10). A first outlet hole is provided between the first mixing chamber (17) and the second mixing chamber (18) for communication. A second outlet hole is provided between the second mixing chamber (18) and the flow equalization chamber (19) for communication. A water outlet is provided at the bottom of the flow equalization chamber (19), and the water outlet is connected to external equipment.

2. The external mixing device for the TOKAMAK test apparatus according to claim 1, characterized in that, The top of the mixing tank (3) is provided with a connecting rod (7), one end of which is fixedly connected to the water distribution plate (6), and the other end is connected to the top of the mixing tank (3).

3. The external mixing device for the TOKAMAK test apparatus according to claim 2, characterized in that, The top of the mixing tank (3) is provided with a fastening structure. The end of the connecting rod (7) away from the water distribution plate (6) extends out of the top of the mixing tank (3) and is connected to the fastening structure. The fastening structure is used to lock the position of the connecting rod (7).

4. The external mixing device for the TOKAMAK test apparatus according to claim 1, characterized in that, The water distribution plate (6) is circular, and the axis of the water distribution plate (6) is coaxial with the central axis of the mixing tank (3).

5. The external mixing device for the TOKAMAK test apparatus according to claim 1, characterized in that, An adjustment device is also provided at the outlet of the transition channel (10), which is used to adjust the up and down position of the baffle plate (14).

6. The external mixing device for the TOKAMAK test apparatus according to claim 1, characterized in that, The diameter of the first water outlet is smaller than the diameter of the second water outlet.

7. The external mixing device for the TOKAMAK test apparatus according to claim 1, characterized in that, The mixing tank (5) is provided with a first partition (15) and a second partition (16) inside, which divide the mixing tank (5) into a first mixing chamber (17), a second mixing chamber (18) and a flow equalization chamber (19) connected in sequence. The bottom of the first partition (15) is provided with a first water outlet; the top of the second partition (16) is provided with a second water outlet; the bottom of the drop plate (8) is in contact with the top of the second partition (16).

8. The external mixing device for the TOKAMAK test apparatus according to claim 1, characterized in that, A connecting pipe is provided between the second mixing chamber (18) and the equalization chamber (19). The connecting pipe is located outside the mixing tank (5). A gate valve is provided on the connecting pipe, and the gate valve is in the open state when water is injected.

9. The external mixing device for the TOKAMAK test apparatus according to claim 1, characterized in that, A balancing pipe is installed between the mixing tank (3) and the mixing water tank (5).

10. A method of using an external mixing device for a TOKAMAK test apparatus, comprising using the external mixing device for a TOKAMAK test apparatus as described in any one of claims 1 to 9, characterized in that, Includes the following steps: S1, turn on the water pumps and valves of the cooling water inlet pipe (1) and the chilled water inlet pipe (2), and the water flows into the mixing tank (3) for the first mixing to form a mixed water flow; S2, the first mixed water flow falls onto the water distribution plate (6), performs a water jump, and performs a second mixing to form a secondary mixed water flow; S3, the secondary mixed water flow falls into the mixing tank (3) after passing through the water distribution plate (6), and undergoes a third free mixing inside the mixing tank (3) to form a three-stage mixed water flow; S4, the three-stage mixed water flow enters the intermediate water tank (4), and is mixed multiple times through the drop plate (8), connecting tank (11) and transition tank (10) in sequence. At the outlet of the transition tank (10), water is blocked by the baffle plate (14), forming a four-stage mixed water flow. S5, the four mixed water flows into the mixing tank (5), first into the first mixing chamber (17), and then into the second mixing chamber (18) through the first outlet hole. Then, from the second mixing chamber (18), it enters the equalization chamber (19) through the second outlet hole, and finally flows out from the water outlet at the bottom of the equalization chamber (19).

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