Permanent magnet low-temperature constant-temperature detection device

Abstract

The device comprises a detection water tank and a refrigeration device, the detection water tank is provided with an outer tank body and an inner tank body, the inner tank body is made of a heat insulation material, the inner tank body is arranged in the outer tank body, the outer wall of the inner tank body is tightly attached to the inner wall of the outer tank body, and a lower notch is formed in the bottom side of the front side wall of the inner tank body; two lower baffles are arranged on the lower portion of the inner wall of the inner tank body, a water flow notch is formed in the edge of the rear side of the lower baffle on the lower side, a water flow notch is formed in the edge of the front side of the lower baffle on the upper side, and two upper baffles are arranged on the upper portion of the inner wall of the inner tank body. A water flow notch is formed in the edge of the rear side of the upper barrier plate on the lower side, a water flow notch is formed in the edge of the front side of the upper barrier plate on the upper side, and an upper notch is formed in the upper side of the rear side wall of the inner tank body, so that the water temperature adjusting process is shorter in time consumption and faster in response, the to-be-detected magnet is kept at the target temperature, and the detection precision is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to constant temperature detection devices, in particular to a permanent magnet low-temperature constant temperature detection device. BACKGROUND

[0002] Due to the inherent magnetism of the magnet being enhanced as the temperature decreases, the magnetic properties (such as remanence) will have a reversible increase when the temperature decreases. After the temperature returns to room temperature, the performance also returns. It is necessary to detect the low temperature to determine whether the reversible change of the magnetic properties of the magnet meets the theoretical expectation.

[0003] Engineers must know the exact performance of the magnet at the lowest working temperature when designing the magnetic circuit, and leave enough design margin. Low-temperature detection provides an accurate data basis to prevent the entire system from failing at low temperature due to changes in magnetic properties. For magnets used in low-temperature equipment (such as MRI, particle accelerators), 100% low-temperature detection must be performed to eliminate defective products that will have irreversible demagnetization at low temperature, and to ensure the performance and life of the final product. Therefore, it is crucial to detect the low temperature of the magnet.

[0004] During the test, the magnet to be tested needs to be placed in a low-temperature device, cooled to the target temperature and maintained, and then measured. The low-temperature device in the prior art needs to adjust the power of the air compressor in real time to adjust the water tank water temperature, so that the water tank water temperature is maintained at the target temperature. However, by adjusting the power of the air compressor to adjust the water tank temperature, the transfer of the cold energy from the refrigerant to the water is required, which takes a certain amount of time, so that the adjustment of the water tank water temperature is lagging behind, making it difficult to maintain the water tank water temperature at the target temperature for a long time, affecting the detection accuracy. SUMMARY

[0005] The purpose of the present application is to provide a permanent magnet low-temperature constant temperature detection device, which can shorten the time required for water temperature adjustment and respond faster, which is beneficial to keeping the magnet to be tested at the target temperature and improving the detection accuracy.

[0006] To achieve the above purpose, the present application provides the following technical solutions: The application discloses a kind of permanent magnet low-temperature constant detection device, including detection water tank and refrigeration device, detection water tank is equipped with outer tank body and inner tank body, inner tank body is heat insulation material, inner tank body is in outer tank body, inner tank body outer wall and inner wall of outer tank body are closely attached, the bottom side of the front side wall of inner tank body is equipped with lower notch, lower notch and inner wall of outer tank body form water inlet chamber, water inlet hole is arranged in the tank wall of lower notch, the lower part of inner wall of inner tank body is equipped with two lower blocking plates, the rear side edge of lower blocking plate of lower side is equipped with water flow gap, the front side edge of lower blocking plate of upper side is equipped with water flow gap, the upper part of inner wall of inner tank body is equipped with two upper blocking plates, the rear side edge of upper blocking plate of lower side is equipped with water flow gap, the front side edge of upper blocking plate of upper side is equipped with water flow gap, the upper side of the rear side wall of inner tank body is equipped with upper notch, upper notch and inner wall of outer tank body form water outlet chamber, refrigeration device is equipped with refrigeration water tank, water outlet pump and backwater pump, water outlet pump and backwater pump are connected with refrigeration water tank by pipeline respectively, water outlet pump is connected with water inlet chamber by water inlet pipe, backwater pump is connected with water outlet chamber by water outlet pipe.

[0007] Specifically, the tank wall of lower notch is provided with a plurality of water inlet holes, and the water inlet holes are arranged in multiple rows.

[0008] Specifically, the distance between the two lower blocking plates is 1-3 cm.

[0009] Specifically, the length of the water inlet pipe is greater than 1.6 meters.

[0010] Specifically, the tank wall of upper notch is provided with a plurality of water outlet holes, and the water outlet holes are arranged in multiple rows.

[0011] Specifically, the distance between the two upper blocking plates is 1-3 cm.

[0012] Specifically, the length of the water outlet pipe is greater than 1.6 meters.

[0013] Specifically, the refrigeration device is provided with a control touch screen.

[0014] Compared with the prior art, the application has the following beneficial effects: See Figure 3 The inner cavity of the inner tank body 12 is divided into a lower cavity, a middle cavity and an upper cavity by the two lower blocking plates 14 and the two upper blocking plates 16. The lower cavity and the middle cavity are communicated through the long and narrow water flow passages between the two lower blocking plates 14, and the middle cavity and the upper cavity are communicated through the long and narrow water flow passages between the two upper blocking plates 16. The cold water of the refrigeration water tank 21 first enters the lower cavity, then enters the upper cavity through the middle cavity, and since the inner tank body 12 as a whole is made of heat insulation material, the heat exchange efficiency between the water and the inner wall of the inner tank body 12 and the lower blocking plates 14 and the upper blocking plates 16 is low, so that there is a certain temperature difference between the water temperature of the lower cavity and the water temperature of the upper cavity, and the water temperature of the lower cavity is lower.

[0015] In order to make the water temperature in the upper cavity reach the target temperature, the water temperature in the refrigeration water tank 21 is set to a temperature slightly lower than the target temperature. The cold water in the refrigeration water tank 21 is delivered to the lower cavity of the inner tank body 12 through the water inlet pipe 131, and then reaches the upper cavity through the middle cavity. In this process, the water temperature gradually rises, so that the water temperature in the upper cavity approaches the target temperature. The cold water continues to be injected, so that the water in the upper cavity part enters the water outlet pipe 171 through the water outlet cavity 17, thereby filling the entire circuit with water. Since the length of the water inlet pipe 131 and the water outlet pipe 171 both exceeds 1.6 meters, the inside of both is filled with a sufficient amount of water.

[0016] When the actual water temperature in the upper cavity is higher than the target temperature: the water outlet pump 22 sends water to the lower cavity at a low speed through the water inlet pipe 131, while the water return pump 23 extracts water from the upper cavity to the water outlet pipe 171 at a low speed, so that a small amount of water with a relatively low temperature flows from the lower cavity to the upper cavity, and a small amount of water with a relatively high temperature originally in the upper cavity is extracted to the water outlet pipe 171, so that the water temperature in the upper cavity decreases to the target temperature.

[0017] The water in the water outlet pipe 171 exchanges heat with the external environment and is slightly warmed, with a temperature slightly higher than the target temperature. When the actual water temperature in the upper cavity is lower than the target temperature, the water return pump 23 is reversed to send a small amount of water with a relatively high temperature in the water outlet pipe 171 into the upper cavity, and the water outlet pump 22 is reversed to extract a small amount of water from the lower cavity, so that a small amount of water with a relatively low temperature originally in the upper cavity is transferred to the middle cavity, thereby increasing the actual water temperature in the upper cavity to the target temperature.

[0018] In this way, by switching the direction of rotation of the water outlet pump 22 and the water return pump 23, the water flow direction is adjusted, so that the water temperature in the upper cavity (where the magnet to be tested 3 is placed) is adjusted, so that the magnet to be tested 3 is kept at the target water temperature, thereby improving the accuracy of the detection results. Since a small amount of relatively low temperature water is already present in the middle cavity, and a small amount of relatively high temperature water is already present in the water outlet pipe 171, when it is necessary to adjust the water temperature in the upper cavity, it is only necessary to control the water flow direction into and out of the upper cavity. Compared with the traditional process of cooling the refrigerant into water, the water temperature adjustment process of the present application is shorter in time and faster in response, which is beneficial to keeping the magnet to be tested 3 at the target temperature and improving the detection accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1 is a structural view of the permanent magnet low-temperature constant-temperature detection device; Figure 2 is another structural view of the permanent magnet low-temperature constant-temperature detection device. Figure 3 It is a partial view of the permanent magnet low-temperature constant temperature detection device; Figure 4 It is a structural view of the inner tank body; Figure 5 It is another structural view of the inner tank body.

[0021] In the figure: 1, detection water tank; 11, outer tank body; 12, inner tank body; 121, lower notch; 122, upper notch; 123, temperature sensor; 13, water inlet cavity; 131, water inlet pipe; 14, lower blocking plate; 15, water flow notch; 16, upper blocking plate; 17, water outlet cavity; 171, water outlet pipe; 2, refrigeration device; 21, refrigeration water tank; 22, water outlet pump; 23, water return pump; 24, control touch screen; 3, magnet to be detected. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all.

[0023] See Figures 1 to 5 A permanent magnet low-temperature constant temperature detection device, comprising a detection water tank 1 and a refrigeration device 2. The detection water tank 1 is provided with an outer tank body 11 and an inner tank body 12, and the inner tank body 12 is made of heat-insulating material. The inner tank body 12 is arranged in the outer tank body 11, and the outer wall of the inner tank body 12 is tightly attached to the inner wall of the outer tank body 11 (see Figure 3 ). The bottom side of the front side wall of the inner tank body 12 is provided with a lower notch 121, and the lower notch 121 and the inner wall of the outer tank body 11 form a water inlet cavity 13 (see Figure 3 ). The slot wall at the lower notch 121 is provided with a water inlet hole.

[0024] The lower part of the inner wall of the inner tank body 12 is provided with two lower blocking plates 14, the rear edge of the lower blocking plate 14 on the lower side is provided with a water flow notch 15, and the front edge of the lower blocking plate 14 on the upper side is provided with a water flow notch 15. The upper part of the inner wall of the inner tank body 12 is provided with two upper blocking plates 16, the rear edge of the upper blocking plate 16 on the lower side is provided with a water flow notch 15, and the front edge of the upper blocking plate 16 on the upper side is provided with a water flow notch 15.

[0025] The upper side of the rear side wall of the inner tank body 12 is provided with an upper notch 122, and the upper notch 122 and the inner wall of the outer tank body 11 form a water outlet cavity 17 (see Figure 3 ). The refrigeration device 2 is provided with a refrigeration water tank 21, a water outlet pump 22 and a water return pump 23, and the water outlet pump 22 and the water return pump 23 are respectively connected to the refrigeration water tank 21 through pipelines. The water outlet pump 22 is connected to the water inlet cavity 13 through a water inlet pipe 131 (see Figure 3The backwater pump 23 is connected with the water outlet cavity 17 through a water outlet pipe 171.

[0026] Specifically, the groove wall at the lower notch 121 is provided with a plurality of water inlet holes arranged in multiple rows.

[0027] Specifically, the spacing between the two lower blocking plates 14 is 1-3 cm (see Figure 3 ).

[0028] Specifically, the length of the water inlet pipe 131 is greater than 1.6 meters.

[0029] Specifically, the groove wall at the upper notch 122 is provided with a plurality of water outlet holes arranged in multiple rows.

[0030] Specifically, the spacing between the two upper blocking plates 16 is 1-3 cm (see Figure 3 ).

[0031] Specifically, the length of the water outlet pipe 171 is greater than 1.6 meters.

[0032] Specifically, the refrigeration device 2 is provided with a control touch screen 24.

[0033] The working principle of the present application is as follows: See Figure 1 , the top wall of the upper blocking plate 16 on the upper side is used to place the magnet to be measured 3. After placing the magnet to be measured 3 on the top wall of the upper blocking plate 16 on the upper side, the target water temperature at the magnet to be measured 3 is set through the control touch screen 24. The side wall of the inner groove body 12 at the edge of the upper blocking plate 16 on the upper side is provided with a temperature sensor 123, which is used to sense the actual water temperature at the magnet to be measured 3.

[0034] Firstly, the refrigeration device 2 starts refrigeration, so that the water temperature in the refrigeration water tank 21 is reduced. Then, the water pump 22 pumps the cold water in the refrigeration water tank 21 to the water inlet cavity 13 (combined with Figure 2 , Figure 3 ), so as to inject water into the inner cavity of the inner groove body 12, until the water level is higher than the magnet to be measured 3 and the temperature sensor 123.

[0035] See Figure 3 , the inner cavity of the inner groove body 12 is divided into a lower cavity, a middle cavity and an upper cavity by the two lower blocking plates 14 and the two upper blocking plates 16. The lower cavity and the middle cavity are communicated through the long and narrow water flow channel between the two lower blocking plates 14, and the middle cavity and the upper cavity are communicated through the long and narrow water flow channel between the two upper blocking plates 16. The cold water of the refrigeration water tank 21 first enters the lower cavity, and then enters the upper cavity through the middle cavity. Again, since the whole inner groove body 12 is made of heat insulation material, the heat exchange efficiency between the water and the inner wall of the inner groove body 12, the lower blocking plate 14 and the upper blocking plate 16 is low, so that there is a certain temperature difference between the water temperature of the lower cavity and the water temperature of the upper cavity, and the water temperature of the lower cavity is lower.

[0036] To make the water temperature of the upper chamber reach the target temperature, the water temperature of the refrigeration water tank 21 is set to a temperature slightly lower than the target temperature. The cold water of the refrigeration water tank 21 is delivered to the lower chamber of the inner tank body 12 through the water inlet pipe 131, and then reaches the upper chamber through the middle chamber. In this process, the water temperature gradually rises, so that the water temperature of the upper chamber approaches the target temperature. The cold water continues to be injected, so that the water in the upper chamber part enters the water outlet pipe 171 through the water outlet chamber 17, thereby filling the entire circuit with water. Since the length of the water inlet pipe 131 and the water outlet pipe 171 both exceeds 1.6 meters, the inside of both is filled with a sufficient amount of water.

[0037] When the actual water temperature of the upper chamber is higher than the target temperature: the water outlet pump 22 sends water to the lower chamber at a low speed through the water inlet pipe 131, while the water return pump 23 extracts the water in the upper chamber to the water outlet pipe 171 at a low speed, so that a small amount of water with a relatively low temperature flows into the upper chamber from the lower chamber, and a small amount of water with a relatively high temperature originally in the upper chamber is extracted to the water outlet pipe 171, so that the water temperature of the upper chamber decreases to the target temperature.

[0038] The water in the water outlet pipe 171 exchanges heat with the external environment and is slightly warmed, with a temperature slightly higher than the target temperature. When the actual water temperature of the upper chamber is lower than the target temperature, the water return pump 23 is reversed to send a small amount of water with a relatively high temperature in the water outlet pipe 171 into the upper chamber, and the water outlet pump 22 is reversed to extract a small amount of water from the lower chamber, so that a small amount of water with a relatively low temperature originally in the upper chamber is transferred to the middle chamber, thereby increasing the actual water temperature of the upper chamber to the target temperature.

[0039] In this way, by switching the rotation direction of the water outlet pump 22 and the water return pump 23, the water flow direction is adjusted, so that the water temperature of the upper chamber (where the magnet to be tested 3 is placed) is adjusted, so that the magnet to be tested 3 can be kept at the target water temperature, thereby improving the detection accuracy. Since a small amount of relatively low temperature water is already present in the middle chamber, and a small amount of relatively high temperature water is already present in the water outlet pipe 171, when it is necessary to adjust the water temperature of the upper chamber, it is only necessary to control the water flow direction into and out of the upper chamber. Compared with the traditional process of guiding the refrigerant to the water, the water temperature adjustment process of the present application is shorter in time and faster in response, which is conducive to keeping the magnet to be tested 3 at the target temperature and improving the detection accuracy.

[0040] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of the present application. Any modification, equivalent change and modification of the above embodiments made in accordance with the technical essence of the present application shall still fall within the scope of the technical solution of the present application.

Claims

1. A permanent magnet cryogenic thermostat detection device, characterized in that: The application relates to a water tank and a refrigerating device, the water tank is provided with an outer tank body and an inner tank body, the inner tank body is made of heat insulation material, the inner tank body is arranged in the outer tank body, the outer wall of the inner tank body is tightly attached to the inner wall of the outer tank body, the bottom side of the front side wall of the inner tank body is provided with a lower notch, the lower notch and the inner wall of the outer tank body form a water inlet cavity, the tank wall at the lower notch is provided with a water inlet hole, the lower part of the inner wall of the inner tank body is provided with two lower blocking plates, the rear side edge of the lower blocking plate on the lower side is provided with a water flow notch, the front side edge of the upper lower blocking plate is provided with a water flow notch, the upper part of the inner wall of the inner tank body is provided with two upper blocking plates, the rear side edge of the lower upper blocking plate is provided with a water flow notch, the front side edge of the upper upper blocking plate is provided with a water flow notch, the upper side of the rear side wall of the inner tank body is provided with an upper notch, the upper notch and the inner wall of the outer tank body form a water outlet cavity, the refrigerating device is provided with a refrigerating water tank, a water outlet pump and a water return pump, the water outlet pump and the water return pump are connected with the refrigerating water tank through pipelines, the water outlet pump is connected with the water inlet cavity through a water inlet pipe, and the water return pump is connected with the water outlet cavity through a water outlet pipe. ​ 2. The permanent magnet cryogenic thermostat detection device according to claim 1, characterized in that: The tank wall at the lower notch is provided with a plurality of water inlet holes, and the water inlet holes are arranged in multiple rows.

3. The permanent magnet cryogenic thermostat detection device according to claim 1, characterized in that: The distance between the two lower blocking plates is 1-3 cm.

4. The permanent magnet cryogenic thermostat detection device according to claim 1, characterized in that: The length of the water inlet pipe is greater than 1.6 m.

5. The permanent magnet cryogenic thermostat detection device according to claim 1, characterized in that: The tank wall at the upper notch is provided with a plurality of water outlet holes, and the water outlet holes are arranged in multiple rows.

6. The permanent magnet cryogenic thermostat detection device according to claim 1, characterized in that: The distance between the two upper blocking plates is 1-3 cm.

7. The permanent magnet cryogenic thermostat detection device according to claim 1, characterized in that: The length of the water outlet pipe is greater than 1.6 m.

8. The permanent magnet cryogenic thermostat detection device according to claim 1, characterized in that: The refrigerating device is provided with a control touch screen.

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