CN110736568B - A large-scale water triple point bottle ice jacket freezing device and method - Google Patents

Abstract

The invention discloses a large-scale water triple point bottle ice sleeve freezing device, which comprises a low-temperature tank and a freezing device, wherein the low-temperature tank is provided with a freezing chamber; the low-temperature tank comprises a tank shell, a supporting sheet, a bracket, a refrigerating system, a heating system, a circulating system and a temperature control system; the supporting sheet is fixedly arranged on the outer wall of the groove shell and used for placing the freezer; the bracket is used for placing a water triple point bottle and soaking the bottle in a low-temperature medium contained in the tank shell; the refrigerating system is used for providing a cold source for the low-temperature tank, and the heating system is used for providing a heat source for the low-temperature tank; the circulating system comprises a motor and a stirring paddle, the temperature control system comprises a temperature controller and a temperature sensor, the freezing device comprises a heat conduction rod and a liquid containing cup, the liquid containing cup is used for containing liquid nitrogen, the heat conduction rod is vertically inserted into a water triple point bottle thermometer well, and the top of the heat conduction rod is welded with stainless steel of the liquid containing cup. The invention also discloses a large water triple point bottle ice sleeve freezing method. The device and the method for freezing the ice sleeve have low requirement on operators, high efficiency, uniform thickness of the ice sleeve and long service life.

Description

A large-scale water triple point bottle ice jacket freezing device and method

technical field

The invention relates to an ice jacket freezing device and method for a triple point bottle, in particular to a large-scale water triple point bottle ice jacket freezing device and method.

Background technique

The triple point of water is the only reference point of Kelvin thermodynamic temperature, and it is also an important fixed point of definition in the ITS-90 international temperature scale. It is of great significance in thermodynamic temperature measurement, international temperature scale reproduction and actual temperature measurement. The triple point of water is reproduced by freezing an ice jacket in a triple point container of water. According to the size, the water triple point bottle can be divided into small water triple point bottle and large water triple point bottle. Small water triple point bottle is mainly used for the verification of industrial platinum resistance thermometers, and large water triple point bottle Mainly used for the verification of standard platinum resistance thermometers. At present, the commonly used method of freezing large water triple point bottles with ice jackets is the liquid nitrogen freezing method. In this method, the water triple point bottles are first put into a Dewar bottle filled with crushed ice for 4-5 hours, and then artificially cooled for 4-5 hours. Slowly pour the liquid nitrogen into the thermometer trap of the water triple point bottle, and at the same time, insert the glass rod with the cotton ball on the top into the thermometer trap to limit the position where the liquid nitrogen stays. The appearance is smooth and the thickness is even. This method has high technical requirements for operators. If the method is not mastered well, it is easy to freeze ice jackets with uneven thickness from top to bottom, and the entire process from preparation to freezing takes a long time and is inefficient.

SUMMARY OF THE INVENTION

To solve the technical problems that the existing large-scale water triple point bottle ice jacket freezing method has higher technical requirements for operators, longer freezing time and lower efficiency, the invention provides a large water triple point bottle ice jacket freezing device and method.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

A large-scale water triple point bottle ice jacket freezing device, comprising a low temperature tank and a freezer;

The low temperature tank includes a tank shell, a support sheet, a bracket, a refrigeration system, a heating system, a circulation system and a temperature control system;

The support sheet is a ring structure, and the support sheet is fixedly arranged on the outer wall of the tank shell for placing the freezer;

The support is used to place the triple point bottle of water, and the support is immersed in the low-temperature medium contained in the tank shell;

The refrigeration system is used to provide a cold source for the low-temperature tank, and the refrigeration system includes a compressor and an evaporator; the compressor is arranged under the tank shell, the evaporator is arranged in the tank shell, and the compressor passes through the tank. The refrigerant circulation pipe is connected with the evaporator;

The heating system is used to provide a heat source for the low temperature tank, and the heating system is a heating resistance wire arranged in the tank shell;

The circulation system includes a motor and a stirring paddle, the stirring paddle is immersed in the low-temperature medium contained in the tank shell, and the stirring paddle is driven by the power output shaft of the motor, and the low-temperature medium is circulated from bottom to top through the rotation of the stirring paddle. flow to ensure the uniformity of the temperature field in the entire cryogenic tank;

The temperature control system includes a temperature controller and a temperature sensor. The temperature sensor collects the temperature of the low-temperature medium contained in the tank shell and feeds back the measured temperature to the temperature controller. The temperature controller adjusts the output power of the cold source and the heat source, and then adjusts the The temperature of the cryogenic medium contained in the tank shell;

The freezer includes a heat-conducting rod and a liquid-holding cup, and the heat-conducting rod is a hollow copper rod; the liquid-holding cup is used for holding liquid nitrogen, and the liquid-holding cup is composed of a three-layer structure, and the innermost layer adopts a three-layer structure. Made of stainless steel, the stainless steel is wrapped with thermal insulation material, and the outermost layer is made of plastic material; the liquid cup is arranged above the bracket, and the heat conduction rod is vertically inserted into the thermometer well of the water triple point bottle to conduct heat. The top of the rod is welded to the stainless steel of the cup.

As a preferred solution of the present invention, a baffle is arranged between the stirring paddle and the support, and a gap is formed between the bottom of the baffle and the bottom of the tank shell.

At the same time, the invention also discloses a large-scale water triple point bottle ice jacket freezing method, in which the above-mentioned large-scale water triple point bottle ice jacket freezing device is adopted, and the method comprises the following steps:

1) Before freezing starts, open the low temperature tank and stabilize the working temperature of the low temperature tank at 0 °C;

2) Put the water triple point bottle on the support in the low temperature tank to pre-cool for 30 minutes, then insert the heat conduction rod of the freezer into the water triple point bottle thermometer well, and fill the water triple point bottle thermometer well Alcohol, inject liquid nitrogen into the liquid cup of the freezer, and take away the heat through the evaporation of liquid nitrogen. After freezing for about 10 minutes, take out the freezer and place it on the support sheet on the tank shell;

3) Take out the water triple point bottle and shake it manually, ice crystals will appear in the water triple point bottle to form crystal nuclei, rotate the water triple point bottle, so that the crystal nuclei are evenly distributed in the water triple point bottle;

4) Put the water triple point bottle back on the support in the low temperature tank, refill the water triple point bottle thermometer well with alcohol, and put the heat-conducting rod of the freezer into the water triple point bottle thermometer well, During the freezing process, always keep the liquid nitrogen in the liquid cup of the freezer, and continue to freeze. The ice jacket begins to form along the inner wall of the water triple point thermometer well to the outer wall. After about 2 minutes of freezing, take out the water. Triple point bottle, rotate the ice jacket to prevent the formation of ice bridges;

5) Put the water triple point bottle on the support in the low temperature tank, put the heat-conducting rod of the freezer into the water triple point bottle thermometer well and continue freezing, and repeat the above operations until the thickness of the frozen ice jacket is reached. to the required thickness.

The technical effect of the invention is that: using the device and method to freeze the ice jacket has low requirements for operators, high efficiency, uniform thickness of the ice jacket, and long use time.

Description of drawings

Figure 1 shows a large-scale water triple point bottle ice jacket freezing device.

In the figure, 1—slot shell; 2—support piece; 3—support; 4—compressor; 5—evaporator; 6—heating resistance wire; 7—stirring paddle; 8—motor; 9—baffle plate; 10—heat conduction rod; 11—liquid cup; 12—water triple point bottle; 13—water triple point bottle thermometer well.

Detailed ways

The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

As shown in Figure 1, a large-scale water triple point bottle ice jacket freezing device includes a low temperature tank and a freezer.

The low temperature tank includes a tank shell 1, a support sheet 2, a bracket 3, a refrigeration system, a heating system, a circulation system and a temperature control system.

The support piece 2 is a ring structure, and the support piece 2 is fixedly arranged on the outer wall of the tank casing 1 for placing the freezer. In this embodiment, two support pieces 2 are disposed on the outer wall of the tank shell 1 by welding, and the two support pieces 2 correspond up and down, and the central holes of the two support pieces 2 also correspond up and down. When placing the freezer, it is only necessary to pass the heat conducting rod 10 of the freezer through the center holes of the two support sheets 2 from top to bottom, and the liquid container 11 of the freezer is placed on the uppermost support sheet 2 .

The bracket 3 is used to place the water triple point bottle 12 , the bracket 3 is immersed in the low-temperature medium contained in the tank shell 1 , and the position of the bracket 3 in the tank shell 1 can be moved. The bracket 3 can also be taken out, and different sizes of the bracket 3 can be designed for different types of water triple point bottles 12 .

The refrigeration system is used to provide a cold source for the low temperature tank, and the refrigeration system includes a compressor 4 and an evaporator 5 . The compressor 4 is arranged under the tank shell 1, and the evaporator 5 is arranged in the tank shell 1. The compressor 4 is connected to the evaporator 5 through the refrigerant circulation pipeline, and the compressor 4 and the evaporator 5 are used for refrigeration. The principle is the same as that of the refrigerator. The principle is the same and will not be repeated here. Of course, to provide the cold source to the cryogenic tank, compressor refrigeration can be used, or semiconductor refrigeration can be used.

The heating system is used to provide a heat source for the low temperature tank, and the heating system is a heating resistance wire 6 arranged in the tank shell 1 .

The circulation system includes a motor 8 and a stirring paddle 7, the stirring paddle 7 is immersed in the low-temperature medium contained in the tank shell 1, and the stirring paddle 7 is driven by the power output shaft of the motor 8, and the low-temperature medium is caused by the rotation of the stirring paddle 7 from bottom to top. Circulating flow ensures uniform temperature field in the whole cryogenic tank. In this embodiment, a baffle 9 is provided between the stirring paddle 7 and the support 3 , and there is a gap between the bottom of the baffle 9 and the bottom of the tank shell 1 . Turn on the motor 8, the motor 8 drives the stirring paddle 7 to rotate, so that the low-temperature medium on the left side of the baffle 9 flows upward and bypasses the top of the baffle 9, and the low-temperature medium bypasses the top of the baffle 9 and enters the right side of the baffle 9, It bypasses the baffle 9 from the bottom of the baffle 9 and enters the left side of the baffle 9, thereby forming a circulating flow.

The temperature control system includes a temperature controller and a temperature sensor. The temperature sensor collects the temperature of the low-temperature medium contained in the tank shell 1 and feeds back the measured temperature to the temperature controller. The temperature controller adjusts the output power of the cold source and the heat source, and then adjusts the tank. The temperature of the cryogenic medium contained in the shell 1. The low temperature tank can use alcohol as the low temperature heat transfer medium, and can also use other antifreeze.

The freezer includes a heat-conducting rod 10 and a liquid-holding cup 11 , and the heat-conducting rod 10 is a hollow copper rod and is vacuumed. The liquid-containing cup 11 is used for containing liquid nitrogen. The liquid-containing cup 11 is composed of a three-layer structure, the innermost layer is made of stainless steel, the stainless steel is wrapped with thermal insulation material, and the outermost layer is made of plastic material. The triple point bottle of water 12 is vertically placed on the support 3, the liquid-containing cup 11 is arranged above the support 3, the heat-conducting rod 10 is vertically inserted into the thermometer well 13 of the triple-point bottle of water, and the top of the heat-conducting rod 10 is connected to the liquid-containing cup. 11 stainless steel welded.

A large-scale water triple point bottle ice jacket freezing method, the method comprises the following steps:

1) Before freezing starts, turn on the low temperature tank and stabilize the working temperature of the low temperature tank at 0°C.

2) Put the water triple point bottle 12 into the support 3 in the low temperature tank to pre-cool for 30min, then insert the heat conducting rod 10 of the freezer into the water triple point bottle thermometer well 13, and place the water triple point bottle thermometer on the water triple point bottle thermometer. The trap 13 is filled with alcohol, and the liquid nitrogen is injected into the liquid cup 11 of the freezer, and the heat is taken away by the evaporation of the liquid nitrogen. superior.

3) Take out the water triple point bottle 12 and shake it manually, ice crystals will appear in the water triple point bottle 12 to form crystal nuclei, and rotate the water triple point bottle 12 to make the crystal nucleus evenly distributed in the water triple point bottle 12.

4) Put the water triple point bottle 12 on the support 3 in the low temperature tank again, fill the water triple point bottle thermometer well 13 with alcohol again, and put the heat conduction rod 10 of the freezer into the water triple point bottle In the thermometer well 13, during the freezing process, the liquid nitrogen cup 11 of the freezer is always kept filled with liquid nitrogen, and the freezing is continued, and the ice jacket begins to form along the inner wall of the water triple point bottle thermometer well 13 in the direction of the outer wall, After freezing for about 2 minutes, take out the water triple point bottle 12, and rotate the ice jacket to prevent the formation of ice bridges.

5) Put the water triple point bottle 12 on the support 3 in the low temperature tank, put the heat-conducting rod 10 of the freezer into the water triple point bottle thermometer trap 13 and continue to freeze, repeat the above-mentioned operations until the frozen The thickness of the ice jacket reaches the required thickness.

Using the device and method of the present invention to freeze the ice jacket has low requirements for operators, high efficiency, uniform thickness of the ice jacket, and long use time.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent substitutions without departing from the spirit and scope of the technical solutions of the present invention should be included in the scope of the claims of the present invention.

Claims (1)

1. A large-scale water triple point bottle ice sleeve freezing method is characterized in that a large-scale water triple point bottle ice sleeve freezing device is adopted in the method, and comprises a low-temperature tank and a freezer;

the low-temperature tank comprises a tank shell (1), a support sheet (2), a support (3), a refrigerating system, a heating system, a circulating system and a temperature control system;

the supporting sheet (2) is of a circular ring structure, and the supporting sheet (2) is fixedly arranged on the outer wall of the groove shell (1) and used for placing a freezer;

the bracket (3) is used for placing a water triple point bottle (12), and the bracket (3) is soaked in a low-temperature medium contained in the tank shell (1);

the refrigeration system is used for providing a cold source for the low-temperature tank and comprises a compressor (4) and an evaporator (5); the compressor (4) is arranged below the tank shell (1), the evaporator (5) is arranged in the tank shell (1), and the compressor (4) is connected with the evaporator (5) through a refrigerant circulating pipeline;

the heating system is used for providing a heat source for the low-temperature tank, and the heating system is a heating resistance wire (6) arranged in the tank shell (1);

the circulating system comprises a motor (8) and a stirring paddle (7), the stirring paddle (7) is immersed in a low-temperature medium contained in the tank shell (1), the stirring paddle (7) is driven by a power output shaft of the motor (8), the low-temperature medium circularly flows from bottom to top through the rotation of the stirring paddle (7), and the uniformity of a temperature field in the whole low-temperature tank is ensured;

the temperature control system comprises a temperature controller and a temperature sensor, the temperature sensor collects the temperature of the low-temperature medium contained in the tank shell (1) and feeds the measured temperature back to the temperature controller, the output power of the cold source and the heat source is adjusted through the temperature controller, and then the temperature of the low-temperature medium contained in the tank shell (1) is adjusted;

the freezing device comprises a heat conducting rod (10) and a liquid containing cup (11), wherein the heat conducting rod (10) is a hollow copper rod; the liquid containing cup (11) is used for containing liquid nitrogen, the liquid containing cup (11) is composed of a three-layer structure, the innermost layer is made of stainless steel, the stainless steel is wrapped by a heat insulation material, and the outermost layer is made of plastic; the liquid containing cup (11) is arranged above the bracket (3), the heat conducting rod (10) is vertically inserted into the thermometer well (13) of the water triple point bottle, and the top of the heat conducting rod (10) is welded with the stainless steel of the liquid containing cup (11);

a baffle (9) is arranged between the stirring paddle (7) and the bracket (3), and a gap is formed between the bottom of the baffle (9) and the bottom in the tank shell (1);

the method comprises the following steps:

1) before the freezing process is started, the low-temperature tank is started, and the working temperature of the low-temperature tank is stabilized at 0 ℃;

2) placing a water triple point bottle (12) on a bracket (3) in a low-temperature tank for precooling for 30min, then inserting a heat conducting rod (10) of a freezer into a water triple point bottle thermometer well (13), filling alcohol into the water triple point bottle thermometer well (13), injecting liquid nitrogen into a liquid containing cup (11) of the freezer, carrying away heat through evaporation of the liquid nitrogen, taking out the freezer after freezing for 10min, and placing the freezer on a support sheet (2) on a tank shell (1);

3) taking out the water triple point bottle (12), manually shaking the water triple point bottle (12), enabling ice crystals to appear in the water triple point bottle (12) to form crystal nuclei, and rotating the water triple point bottle (12) to enable the crystal nuclei to be uniformly distributed in the water triple point bottle (12);

4) putting the water triple point bottle (12) on the support (3) in the low-temperature tank again, filling alcohol in the water triple point bottle thermometer well (13) again, putting the heat conducting rod (10) of the freezer into the water triple point bottle thermometer well (13), always keeping the liquid nitrogen in the liquid containing cup (11) of the freezer during the freezing process, continuing freezing, starting to form an ice sleeve along the inner wall of the water triple point bottle thermometer well (13) to the outer wall direction, taking out the water triple point bottle (12) after freezing is restricted for 2min, and rotating the ice sleeve to prevent the generation of an ice bridge;

5) and (3) placing the water triple point bottle (12) on a bracket (3) in a low-temperature groove, placing the heat conducting rod (10) of the freezer into a thermometer well (13) of the water triple point bottle to continue freezing, and repeating the operation until the thickness of the frozen ice sleeve reaches the required thickness.

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