Cold trap water cooling system and magnetothermal effect measuring instrument

Abstract

The invention discloses a cold trap water cooling system and a magnetothermal effect measuring instrument. The cold trap water cooling system comprises a follow current piston cylinder, a follow current piston, an elastic element, a linked switch, a cold trap, an outlet water storage tank and a water supply assembly; a water outlet of the water supply assembly is communicated to the lower part of the follow-flow piston cylinder; the follow-flow piston comprises a main body part and a connecting part; two ends of the elastic element are respectively connected with the follow-current piston cylinder and the follow-current piston; when the elastic element is in a deformation-free state, the main body part of the follow-current piston is positioned at the lower part of the follow-current piston cylinder; when the follow current piston moves upwards to the top of the follow current piston cylinder, the connecting part of the follow current piston can trigger the linked switch to be closed, and the linked switch is a normally open switch; the bottom of the follow current piston cylinder communicates with a water inlet of the cold trap and is used for conducting water cooling on the hot end of the cold trap. A water outlet of the cold trap is communicated with the bottom of the outlet water storage tank, and the upper portion of the outlet water storage tank is communicated with a water inlet of the water supply assembly. And the starting and stopping operation of cold trap refrigeration is safe.

Description

Technical Field

[0001] The invention relates to a cold trap water cooling system and a magnetocaloric effect tester. Background Art

[0002] The cold trap used in magnetocaloric effect measuring instruments generates refrigeration, and the hot end of the cold trap requires cooling water to circulate. If the cooling water supply fails (for example, due to a pipe blockage), insufficient heat dissipation from the hot end of the cold trap can easily burn out. Summary of the Invention

[0003] The invention provides a cold trap water cooling system and a magnetocaloric effect tester to improve the safety of the cold trap operation.

[0004] The present invention provides the following technical solution: a cold trap water cooling system, comprising: a continuous flow piston cylinder, a continuous flow piston, an elastic element, a linkage switch, a cold trap, an outlet water storage tank and a water supply assembly;

[0005] The water outlet of the water supply assembly is connected to the lower part of the afterflow piston cylinder. The afterflow piston includes a main body and a connecting part. The main body is in sliding and sealing contact with the inner circumference of the afterflow piston cylinder. The connecting part is connected to the main body and extends upward from the afterflow piston cylinder. The main body can move up and down in the afterflow piston cylinder.

[0006] The two ends of the elastic element are respectively connected to the afterflow piston cylinder and the afterflow piston, and when the elastic element is in a non-deformed state, the main body of the afterflow piston is located at the lower part of the afterflow piston cylinder;

[0007] When the freewheeling piston moves upward to the top of the freewheeling piston cylinder, the connecting portion of the freewheeling piston can trigger the linkage switch to close, and the linkage switch is a normally open switch;

[0008] The bottom of the afterflow piston cylinder is connected to the water inlet of the cold trap, and is used to perform water cooling on the hot end of the cold trap;

[0009] The water outlet of the cold trap is communicated with the bottom of the outlet water storage tank, and the upper part of the outlet water storage tank is communicated with the water inlet of the water supply assembly;

[0010] Wherein, the water inlet of the afterflow piston cylinder and the water outlet of the outlet water storage tank are both higher than the cold trap.

[0011] After the water supply assembly activates the water supply, cooling water flows into the continuous flow piston cylinder, lifting the continuous flow piston. This causes the continuous flow piston to elastically deform the elastic member, and the connecting portion of the continuous flow piston presses upward against the linkage switch, triggering the linkage switch to close, activating the cold trap. Simultaneously, cooling water flows through the cold trap, dissipating heat from the hot end of the cold trap. After flowing out of the cold trap, the cooling water enters the outlet water storage tank, where a certain amount of cooling water is stored. The cooling water in the outlet water storage tank then flows back into the water supply assembly, completing the cooling water circulation.

[0012] The cold trap activates only when cooling water is supplied. If the cooling water supply is blocked, the elastic element returns to its original state, causing the freewheeling piston to descend, the linkage switch to return to its off position, and the cold trap to cease operation. This prevents the cold trap from burning out. Furthermore, the cooling water stored in the freewheeling piston cylinder and the outlet water tank ensures that the cooling water in the cold trap does not drain out, further ensuring its safe operation.

[0013] In some embodiments, the water supply assembly includes a water supply tank, a pump and a one-way valve; the pump is used to pump the water in the water supply tank into the continuous flow piston cylinder through the one-way valve, and the water inlet of the water supply tank is connected to the water outlet of the outlet water storage tank.

[0014] That is, the cooling water in the outlet water storage tank flows into the water supply tank, and the cooling water in the water supply tank is pumped to the continuous flow piston cylinder through the pump and the one-way valve.

[0015] In some embodiments, when the linkage switch is closed, the cold trap starts refrigeration; when the linkage switch is opened, the cold trap stops refrigeration.

[0016] For example, the linkage switch controls the on / off of the cold trap's power supply circuit. When the linkage switch is closed, the cold trap's power supply circuit is connected; when the linkage switch is open, the cold trap's power supply circuit is disconnected. When the cold trap is powered, cooling begins.

[0017] In some embodiments, when the cold trap is in a refrigeration state, the main body of the continuous flow piston is higher than the water outlet of the outlet water storage tank.

[0018] The water pressure is greater near the water outlet of the water supply assembly, and the main body of the continuous flow piston is located higher there.

[0019] In some embodiments, a relay is further included, and both ends of the linkage switch are connected in series with the coil of the relay before the neutral wire and the live wire. The common end and the normally open contact of the relay are connected in series with the refrigeration component of the cold trap between a pair of DC power supply ends. The refrigeration component of the cold trap is a semiconductor refrigeration plate or a semiconductor refrigeration plate group.

[0020] When the linkage switch is closed, the relay is energized, and then the semiconductor refrigeration plate or semiconductor refrigeration plate group is energized, and the cold trap starts cooling.

[0021] It should be noted that the present invention does not limit the structure of the cold trap, and designs can be made with reference to existing technologies. The semiconductor refrigeration fins in the semiconductor refrigeration fin assembly can be connected in series, in parallel, or in a combination of series and parallel. The present invention does not limit the connection method of the semiconductor refrigeration fin assembly.

[0022] In some embodiments, the elastic element is a spring, the first end of the spring is connected to the top of the afterflow piston cylinder, and the second end of the spring is connected to the upper surface of the main body of the afterflow piston. When the afterflow piston is located at the top of the afterflow piston cylinder, the spring is in a compressed state.

[0023] When the afterflow piston moves upward, it compresses the spring. When the water supply is interrupted, the spring pushes the afterflow piston downward, draining the cooling water retained in the afterflow piston cylinder into the cold trap.

[0024] In some embodiments, when the spring is in a natural state, the freewheeling piston is located at the bottom of the freewheeling piston cylinder.

[0025] In this way, the spring drives the afterflow piston to move a large enough distance to discharge enough cooling water into the cold trap.

[0026] In some embodiments, an exhaust valve is further included, which is disposed on the top of the outlet water storage tank.

[0027] The exhaust valve helps to discharge air from the outlet water storage tank and reduce the resistance to the rising cooling water level in the outlet water storage tank.

[0028] When the cooling water level in the outlet water storage tank drops, the exhaust valve allows air to enter the outlet water storage tank, reducing the resistance to the cooling water level drop.

[0029] The present invention provides the following technical solution: a magnetocaloric effect measuring instrument, comprising the aforementioned cold trap water cooling system.

[0030] The magnetocaloric effect tester can be flexibly designed according to test requirements. The present invention does not limit the specific structure and working principle of the magnetocaloric effect tester, and the design can refer to the existing technology.

[0031] In some embodiments, a heat pipe is further included, and the cold end of the cold trap of the cold trap water cooling system is used to cool the heat pipe.

[0032] The sample moves within the heat pipe, where it interacts with the magnetic field to generate a magnetocaloric effect. The cold trap dissipates heat from the heat pipe. The sample's temperature change serves as an indicator of its magnetocaloric effect.

[0033] The cold trap water cooling system of the present invention starts refrigeration only when there is sufficient cooling water supply, stops refrigeration after the cooling water supply is interrupted (for example, caused by water pump failure or pipeline failure), and maintains the cooling water to continue flowing for a period of time and ensures that the cooling water is preserved in the cold trap, thereby extending the service life of the cold trap. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the cold trap water cooling system of the present invention.

[0035] Figure 2 It is a structural schematic diagram of the magnetocaloric effect measuring instrument of the present invention.

[0036] Figure 3 It is a schematic diagram of the power supply relationship of the cold trap water cooling system of the present invention.

[0037] The accompanying drawings are marked as follows: 1. One-way valve; 2. Interlocking switch; 3. Freewheeling piston; 4. Spring; 5. Freewheeling piston cylinder; 6. Cold trap; 7. Exhaust valve; 8. Outlet water storage tank; 9. Sample rod; 10. Sample; 11. Magnetic field system; 12. Heat pipe; C, refrigeration component; KM, relay; L, live wire; N, neutral wire; D+, D-, DC power supply terminals. DETAILED DESCRIPTION

[0038] The present invention will be further described below with reference to specific embodiments, but the protection scope of the present invention is not limited thereto.

[0039] Example 1

[0040] refer to Figure 1 and Figure 3 , Example 1 provides a cold trap water cooling system, including: a continuous flow piston cylinder 5, a continuous flow piston 3, an elastic element, a linkage switch 2, a cold trap 6, an outlet water storage tank 8 and a water supply component.

[0041] Figure 1 The arrow in the middle indicates the flow direction of cooling water.

[0042] The water supply assembly includes a water supply tank (not shown), a pump (not shown) and a one-way valve 1; the pump is used to pump the water in the water supply tank into the continuous flow piston cylinder 5 through the one-way valve 1, and the water inlet of the water supply tank is connected to the water outlet of the outlet water storage tank 8.

[0043] The water outlet of the water supply assembly (i.e., the water outlet of the one-way valve 1) is connected to the lower part of the continuous flow piston cylinder 5. The continuous flow piston 3 includes a main body (a horizontally placed flat plate) and a connecting part (a vertically extending columnar shape). The main body is in sliding and sealing contact with the inner circumferential surface of the continuous flow piston cylinder 5. The connecting part is connected to the main body and extends upward out of the continuous flow piston cylinder 5. The main body can move up and down in the continuous flow piston cylinder 5.

[0044] The two ends of the elastic element are respectively connected to the afterflow piston cylinder 5 and the afterflow piston 3 . When the elastic element is in a non-deformed state, the main body of the afterflow piston 3 is located at the lower part of the afterflow piston cylinder 5 .

[0045] The elastic element is a spring 4, the first end of the spring 4 is connected to the top of the afterflow piston cylinder 5, and the second end of the spring 4 is connected to the upper surface of the main body of the afterflow piston 3. When the afterflow piston 3 is located at the top of the afterflow piston cylinder 5, the spring 4 is in a compressed state.

[0046] When the afterflow piston 3 moves upward, it squeezes the spring 4. When the water supply is interrupted, the spring 4 pushes the afterflow piston 3 downward, and the cooling water retained in the afterflow piston cylinder 5 is discharged into the cold trap 6.

[0047] When the freewheeling piston 3 moves upward to the top of the freewheeling piston cylinder 5 , the connection portion of the freewheeling piston 3 can trigger the linkage switch 2 to close, and the linkage switch 2 is a normally open switch.

[0048] When the linkage switch 2 is closed, the cold trap 6 starts refrigeration; when the linkage switch 2 is opened, the cold trap 6 stops refrigeration.

[0049] The linkage switch 2 controls the on / off of the power supply circuit of the cold trap 6. When the linkage switch 2 is closed, the power supply circuit of the cold trap 6 is connected, and when the linkage switch 2 is opened, the power supply circuit of the cold trap 6 is disconnected. When the cold trap 6 is powered, the cooling is started.

[0050] When the cold trap 6 is in a refrigeration state, the main body of the afterflow piston 3 is higher than the water outlet of the outlet water storage tank 8 .

[0051] The water pressure is greater near the water outlet of the water supply assembly, and the main body of the continuous flow piston 3 is located higher there.

[0052] The bottom of the afterflow piston cylinder 5 is connected to the water inlet of the cold trap 6, and is used to cool the hot end of the cold trap 6 with water.

[0053] The outlet of the cold trap 6 is connected to the bottom of the outlet water tank 8, and the top of the outlet water tank 8 is connected to the water inlet of the water supply assembly. The cooling water in the outlet water tank 8 flows into the water supply tank, and the cooling water in the water supply tank is pumped through the pump and the one-way valve 1 to the continuous flow piston cylinder 5.

[0054] Among them, the water inlet of the afterflow piston cylinder 5 and the water outlet of the outlet water storage tank 8 are both higher than the cold trap 6.

[0055] After the water supply assembly starts supplying water, cooling water flows into the continuous flow piston cylinder 5, pushing up the continuous flow piston 3. The continuous flow piston 3 drives the elastic part to undergo elastic deformation, and the connecting portion of the continuous flow piston 3 presses upward against the linkage switch 2, thereby triggering the linkage switch 2 to be in the closed state, and the cold trap 6 starts working. At the same time, the cooling water flows through the cold trap 6 to dissipate heat from the hot end of the cold trap 6. After flowing out of the cold trap 6, the cooling water enters the outlet water storage tank 8, and a certain amount of cooling water is stored in the outlet water storage tank. The cooling water in the outlet water storage tank then flows back to the water supply assembly. In this way, the circulation of the cooling water is completed.

[0056] The cold trap 6 is activated only when cooling water is supplied. If the cooling water supply is blocked, the elastic element returns to its original state, causing the freewheeling piston 3 to descend, the linkage switch 2 to return to its off state, and the cold trap 6 to cease operation. This prevents the cold trap 6 from burning out. Furthermore, the cooling water stored in the freewheeling piston cylinder 5 and the outlet water storage tank 8 ensures that the cooling water in the cold trap 6 does not drain out, further ensuring the safe operation of the cold trap 6.

[0057] refer to Figure 3 The cold trap water cooling system also includes a relay KM. The two ends of the linkage switch 2 are connected in series with the coil of the relay KM before the neutral line N and the live line L. The common end and the normally open contact of the relay KM are connected in series with the refrigeration component C of the cold trap 6 between a pair of DC power supply terminals D+ and D-. The refrigeration component C of the cold trap 6 is a semiconductor refrigeration plate group.

[0058] Two semiconductor refrigeration chips in the semiconductor refrigeration chip group are connected in series to form a refrigeration component C. After the semiconductor refrigeration chip in the cold trap 6 passes through the direct current, a temperature difference is generated at both ends of the refrigeration chip, resulting in a cold end and a hot end. The purpose of multi-stage series connection is to increase the temperature difference between the cold and hot ends.

[0059] When the linkage switch 2 is closed, the relay KM is energized, and then the semiconductor refrigeration plate group is energized, and the cold trap 6 starts refrigeration.

[0060] Continue to refer Figure 1 When the spring 4 is in the natural state, the afterflow piston 3 is located at the bottom of the afterflow piston cylinder 5.

[0061] In this way, the spring 4 drives the afterflow piston 3 to move a distance large enough to discharge enough cooling water into the cold trap 6.

[0062] The cold trap water cooling system further includes an exhaust valve 7 , which is arranged on the top of the outlet water storage tank 8 .

[0063] The exhaust valve 7 helps the outlet water storage tank 8 to discharge air, thereby reducing the resistance to the rising cooling water level in the outlet water storage tank 8.

[0064] When the cooling water level in the outlet water storage tank 8 drops, the exhaust valve 7 allows air to enter the outlet water storage tank 8, reducing the resistance to the cooling water level drop.

[0065] Example 2

[0066] refer to Figure 2 Example 2 provides a magnetocaloric effect measuring instrument, including the cold trap water cooling system of Example 1, and also including a heat pipe 12, a sample rod 9, and a magnetic field system 11.

[0067] Figure 2 Only the cold trap 6 in the cold trap water cooling system is shown, and the cold end of the cold trap 6 is close to the heat conduction pipe 12. The cold end of the cold trap 6 in the cold trap water cooling system is used to cool the heat conduction pipe 12.

[0068] The sample 10 moves within the heat pipe 12, and the magnetic field system 11 cooperates with the sample 10 to generate a magnetocaloric effect. The cold trap 6 is used to dissipate heat from the heat pipe 12. The temperature change of the sample 10 is used as an indicator of the magnetocaloric effect of the sample 10.

[0069] The front end of the sample rod 9 contains a sample chamber, within which a sample 10 is placed. During the measurement process, the sample rod 9 drives the sample 10 in horizontal reciprocating motion along the heat pipe 12, causing the sample 10 to enter and exit the magnetic field system 11. The magnetic field causes the sample 10 to undergo a temperature change, and a temperature sensor (not shown) collects the temperature change data. The temperature of the heat pipe 12 is controlled by a temperature control system, which can produce different ambient temperatures for the sample 10. The temperature control system combines a cold trap 6 and a heater (not shown) to provide a stable ambient temperature. The cold trap 6 acts as a refrigeration device, with its cold end in close contact with the heat pipe 12 and its hot end on the outside. The hot end requires the cold trap water cooling system to dissipate heat. Insufficient heat dissipation from the cold trap 6 can result in burns.

[0070] Figure 2 The arrows near the intermediate cooling trap 6 indicate the flow direction of the cooling water. Figure 2 From the perspective, the water inlet is at the bottom of the cold trap 6 and the water outlet is at the top.

[0071] The present invention is not limited to the above-mentioned embodiments. Any modification, improvement, or substitution that can be conceived by those skilled in the art without departing from the essential content of the present invention shall fall within the scope of the present invention.

Claims

1. A cold trap water cooling system, characterized in that: include: Afterflow piston cylinder, afterflow piston, elastic element, linkage switch, cold trap, outlet water storage tank and water supply assembly; The water outlet of the water supply assembly is connected to the lower part of the afterflow piston cylinder. The afterflow piston includes a main body and a connecting part. The main body is in sliding and sealing contact with the inner circumference of the afterflow piston cylinder. The connecting part is connected to the main body and extends upward from the afterflow piston cylinder. The main body can move up and down in the afterflow piston cylinder. The two ends of the elastic element are respectively connected to the afterflow piston cylinder and the afterflow piston, and when the elastic element is in a non-deformed state, the main body of the afterflow piston is located at the lower part of the afterflow piston cylinder; When the freewheeling piston moves upward to the top of the freewheeling piston cylinder, the connecting portion of the freewheeling piston can trigger the linkage switch to close, and the linkage switch is a normally open switch; The bottom of the afterflow piston cylinder is connected to the water inlet of the cold trap, and is used to perform water cooling on the hot end of the cold trap; The water outlet of the cold trap is communicated with the bottom of the outlet water storage tank, and the upper part of the outlet water storage tank is communicated with the water inlet of the water supply assembly; Wherein, the water inlet of the afterflow piston cylinder and the water outlet of the outlet water storage tank are both higher than the cold trap.

2. The cold trap water cooling system according to claim 1, characterized in that: The water supply assembly includes a water supply tank, a pump and a one-way valve; the pump is used to pump the water in the water supply tank into the continuous flow piston cylinder through the one-way valve, and the water inlet of the water supply tank is connected to the water outlet of the outlet water storage tank.

3. The cold trap water cooling system according to claim 1, characterized in that: When the linkage switch is closed, the cold trap starts refrigeration; when the linkage switch is opened, the cold trap stops refrigeration.

4. The cold trap water cooling system according to claim 1, characterized in that: When the cold trap is in a refrigeration state, the main body of the afterflow piston is higher than the water outlet of the outlet water storage tank.

5. The cold trap water cooling system according to claim 1, characterized in that: It also includes a relay, wherein the two ends of the linkage switch and the coil of the relay are connected in series before the neutral wire and the live wire, and the common end and the normally open contact of the relay are connected in series with the refrigeration component of the cold trap between a pair of DC power supply ends, and the refrigeration component of the cold trap is a semiconductor refrigeration plate or a semiconductor refrigeration plate group.

6. The cold trap water cooling system according to claim 1, characterized in that: The elastic element is a spring, the first end of the spring is connected to the top of the afterflow piston cylinder, and the second end of the spring is connected to the upper surface of the main body of the afterflow piston. When the afterflow piston is located at the top of the afterflow piston cylinder, the spring is in a compressed state.

7. The cold trap water cooling system according to claim 6, characterized in that: When the spring is in a natural state, the afterflow piston is located at the bottom of the afterflow piston cylinder.

8. The cold trap water cooling system according to claim 1, characterized in that: It also includes an exhaust valve, which is arranged on the top of the outlet water storage tank.

9. A magnetocaloric effect measuring instrument, characterized in that: The invention comprises a cold trap water cooling system according to any one of claims 1 to 8.

10. The magnetocaloric effect tester according to claim 9, characterized in that: It also includes a heat conduction pipe, and the cold end of the cold trap of the cold trap water cooling system is used to cool the heat conduction pipe.

Images