Laboratory condenser cooling device based on water temperature difference automatic circulation

Abstract

The invention discloses a laboratory condenser cooling device based on water temperature difference automatic circulation, relates to the technical field of laboratory equipment cooling, and aims to solve the problem of water resource waste caused by the fact that an existing condenser is directly cooled by tap water. The device comprises a condenser, a cooling cavity, a heat dissipation device, an upper circulating pipe and a lower circulating pipe, the condenser is sleeved with the cooling cavity, the upper circulating pipe is connected with the top of the cooling cavity and a water inlet of the heat dissipation device, and the lower circulating pipe is connected with a water outlet of the heat dissipation device and the bottom of the cooling cavity to form a closed circulating loop. The core principle is a thermosyphon effect: cooling water in a cooling cavity is heated after absorbing heat of a condenser, the density is reduced, and the cooling water naturally rises to a heat dissipation device through an upper circulating pipe; hot water is cooled after air heat dissipation, the density is increased, the hot water flows back to the cooling cavity through the lower circulating pipe, and automatic circulating cooling is achieved. The device does not need an additional power source, consumes no water resource, is simple in structure, convenient to maintain and stable in cooling effect, is suitable for condenser cooling in processes such as laboratory distillation and reflux, and meets the requirements of energy conservation and environmental protection.

Description

TECHNICAL FIELD

[0002] The present application relates to the field of laboratory equipment cooling technology, in particular to a laboratory condenser cooling device based on automatic circulation of water temperature difference. BACKGROUND

[0003] In the process of distillation, reflux and other chemical experiments or sample processing in the laboratory, the condenser is one of the core equipment, which cools and condenses the steam into liquid. At present, the cooling method of laboratory condenser mainly adopts direct flushing of tap water or through cooling: tap water is continuously introduced into the cooling channel of the condenser, and then discharged to the sewer after absorbing the heat of the steam.

[0004] This traditional cooling method has significant defects: on the one hand, tap water is only used for heat exchange once and then discharged, which leads to serious waste of water resources - according to the regular use data of laboratory, a 2L distillation condenser consumes about 1-1.5m³ of water per hour, and the daily water consumption of 8 hours of experiment is about 10m³, which will result in high water fee expenditure in the long run, and is contrary to the concept of "water-saving society" advocated by the state; on the other hand, the temperature of tap water is greatly affected by municipal water supply, and the cooling efficiency decreases when the water temperature is high in summer, which may lead to poor condensation effect and affect the experimental accuracy; in addition, the continuous discharge of waste water may also carry a small amount of experimental volatile substances, increasing the pressure of sewage treatment.

[0005] Although there are circulating cooling systems driven by water pumps in the prior art, they need to consume additional electric energy, and there is a risk of cooling interruption caused by water pump failure, which has complex structure and high maintenance cost, and is not suitable for simple operation scenes in small laboratories. Therefore, it is an urgent need to develop a condenser cooling device without additional power, water resource recycling and stable cooling effect, which is an urgent need for laboratory equipment optimization. SUMMARY

[0006] I. Technical problems to be solved

[0007] The purpose of the present application is to overcome the defects of water resource waste, high energy consumption and complex structure of the existing laboratory condenser cooling method, and to provide a cooling device based on automatic circulation of water temperature difference, which realizes power-free and zero water consumption circulating cooling.

[0008] II. Technical solutions

[0009] To achieve the above purpose, the present application adopts the following technical solutions:

[0010] A laboratory condenser cooling device based on automatic circulation of water temperature difference, comprising a condenser, a cooling cavity, a heat dissipation device, an upper circulation pipe and a lower circulation pipe, the specific structure and connection relationship of each part are as follows:

[0011] 1. Condenser: Use a laboratory conventional distillation or reflux condenser, which is provided with a heat exchange cavity inside, used to contain the steam or high temperature medium to be cooled, and the material is glass with good heat conductivity.

[0012] 2. Cooling cavity: It is a closed annular cavity made of glass, which is sleeved outside the condenser and tightly adheres to the outer wall of the condenser to ensure efficient heat transfer. The inner wall of the cooling cavity is coated with a heat-conducting coating to further improve the heat exchange efficiency; the top and bottom of the cooling cavity are respectively provided with interfaces for connecting the upper and lower circulating pipes, and the interfaces are sealed with sealing washers to prevent leakage of cooling water.

[0013] 3. Heat dissipation device: Choose a heat dissipation water tank or heat dissipation fin exposed to air, preferably with a heat dissipation fin structure - the heat dissipation fins are evenly distributed along the length direction of the heat dissipation device, and the material is aluminum alloy or copper, which can strengthen the heat dissipation effect by increasing the contact area with air. The installation height of the heat dissipation device is 10-50 cm higher than the top of the cooling cavity, which can enhance the driving force of the thermosyphon effect by using the height difference.

[0014] 4. Circulating pipe: The upper and lower circulating pipes are made of pp plastic heat preservation pipe material, and the outer wall is wrapped with a heat preservation layer to reduce the heat exchange between the cooling water and the outside during circulation, ensuring the stability of the temperature difference between the cooling cavity and the heat dissipation device. The upper circulating pipe connects the top of the cooling cavity and the water inlet of the heat dissipation device, and the lower circulating pipe connects the water outlet of the heat dissipation device and the bottom of the cooling cavity, forming a complete closed circulation loop.

[0015] The automatic circulation cooling working process of the present application is as follows:

[0016] Step 1: heat absorption and temperature rise, density reduction - when the condenser works, the steam or high temperature medium in the heat exchange cavity releases heat, which is transferred to the cooling water in the cooling cavity through the outer wall of the condenser. The temperature of the cooling water rises, and the density decreases from about 1000 kg / m³ to 970-990 kg / m³, forming low-density hot water.

[0017] Step 2: thermosyphon driving, hot water rising - due to the density difference between the hot water in the cooling cavity and the cold water in the heat dissipation device, the low-density hot water produces upward buoyancy under the action of thermosyphon effect, and naturally rises to the heat dissipation device through the upper circulating pipe.

[0018] Step 3: heat dissipation and temperature drop, density increase - after the hot water enters the heat dissipation device, it exchanges heat with the air, and the heat is dissipated to the atmosphere through the heat dissipation surface (or heat dissipation fin), and the water temperature drops to room temperature (about 25-30℃ in summer and about 15-20℃ in winter), and the density returns to 995-1000 kg / m³, forming high-density cold water.

[0019] Step 4: Cold water reflux, reciprocating cycle - high-density cold water under the action of gravity, through the lower circulation pipe to the bottom of the cooling cavity, and again absorbs the heat transferred by the condenser, repeating the above process to achieve continuous cycle cooling.

[0020] As long as the condenser continues to produce heat and the heat dissipation device dissipates heat normally, the cooling water can automatically circulate in the closed loop without the need for power devices such as water pumps to drive.

[0021] III. Beneficial Effects

[0022] Compared with the prior art, the present application has the following beneficial effects:

[0023] 1. Extremely water-saving: cooling water is recycled in a closed loop without any water discharge, completely solving the waste problem of traditional tap water cooling method, and can be used for a long time after single water addition, only needing to supplement a small amount of water loss periodically.

[0024] 2. Energy consumption-free operation: relies on the thermosyphon effect to achieve automatic circulation, without the need for power equipment such as motors and water pumps, zero electric energy consumption, and reduced experimental operation cost.

[0025] 3. Stable cooling effect: the cooling cavity and the condenser are closely coupled, the heat-conducting coating improves the heat exchange efficiency; the heat dissipation fins of the heat dissipation device are designed to enhance the heat dissipation effect, and the cooling water temperature is maintained at a stable temperature difference through the heat preservation pipe, ensuring that the condensation effect is not affected by the external water temperature.

[0026] 4. Simple and reliable structure: composed of only basic components such as circulation pipes and heat dissipation devices, without complex mechanical structures, low failure rate, easy maintenance, and suitable for distillation, reflux and other processes in various laboratories.

[0027] 5. Environmentally friendly and pollution-free: no wastewater discharge, avoiding the problem of experimental pollutants carried by wastewater in traditional cooling methods, and reducing environmental pressure. DETAILED DESCRIPTION

[0029] The present application will be further described in detail below in conjunction with specific embodiments:

[0030] Example 1

[0031] This embodiment provides a laboratory condenser cooling device based on automatic circulation of water temperature difference, which is specifically configured as follows:

[0032] • Condenser: a 2L glass reflux condenser is selected, made of high borosilicate glass with good heat conductivity.

[0033] • Cooling cavity: an annular closed cavity is used, made of high borosilicate glass, with an inner diameter matching the outer diameter of the condenser, an inner wall coated with graphene heat-conducting coating, and an interface provided at the top and bottom respectively.

[0034] • Heat dissipation device: aluminum alloy heat dissipation water tank, 50 cm long, 30 cm wide, 20 cm high, 20 pieces of aluminum alloy heat dissipation fins (1 mm thick, 5 cm high) are welded on the outer wall of the water tank, and the installation height of the heat dissipation device is 30 cm higher than the top of the cooling cavity.

[0035] • Circulation pipe: both the upper and lower circulation pipes are made of pp plastic insulation pipe, the outer wall of which is wrapped with an insulation layer, and the two ends are connected to the cooling cavity and the heat dissipation device through a plug-in sleeve to realize sealed connection.

[0036] The use process of this embodiment is as follows:

[0037] 1. Inject deionized water into the closed circulation loop to ensure that the cooling cavity, circulation pipe and heat dissipation device are filled with water without air bubbles.

[0038] 2. Start the experimental device corresponding to the condenser. The steam in the condenser heat exchange cavity releases heat, which is transferred to the cooling water in the cooling cavity.

[0039] 3. After absorbing heat, the cooling water is heated to 40-50℃, the density is reduced, and it naturally rises to the heat dissipation water tank through the upper circulation pipe, and is heat exchanged with the air under the action of the heat dissipation fins, and is cooled to 25-30℃.

[0040] 4. The cooled water returns to the bottom of the cooling cavity through the lower circulation pipe and absorbs heat again to form continuous circulation.

[0041] 5. The experimenter monitors the cooling water temperature in real time through the temperature display. When the ambient temperature is too high (such as more than 35℃ in summer), a small fan can be placed beside the heat dissipation device to assist heat dissipation and ensure cooling effect.

[0042] After testing, the cooling efficiency of the cooling device of this embodiment is equivalent to that of the traditional tap water cooling method, the condensate temperature at the outlet of the condenser is stable at 20-25℃, which meets the experimental requirements; and it can be used continuously for 72 hours after adding water once, only about 0.2L of evaporated water needs to be supplemented, the water saving rate is more than 99%, no electricity is consumed, and the maintenance cost is very low.

[0043] Example 2

[0044] The difference between this embodiment and Example 1 is that the heat dissipation device uses copper heat dissipation fins (area 0.5㎡), the installation height is 20 cm higher than the top of the cooling cavity; the circulation pipe is made of pp plastic insulation pipe, and the insulation layer is made of rock wool; the rest of the structure is the same.

[0045] The heat dissipation efficiency of the embodiment is slightly higher than that of embodiment 1, the cooling water cooling speed is increased by 15%, and the embodiment is suitable for distillation experiments with higher cooling efficiency requirements, and also realizes zero water consumption and energy consumption-free circulating cooling. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 The whole structure of the present application is shown in the schematic diagram;

[0047] Figure 2 The condenser A-A' is shown in the sectional view;

[0048] Figure 3 The heat dissipation device B-B' is shown in the view;

[0049] Wherein: 1 - condenser; 9 - heat exchange chamber; 2 - cooling chamber, 8 - heat conducting coating; 3 - heat dissipation device; 7 - heat dissipation fin; 4 - upper circulating pipe; 5 - lower circulating pipe; 6 - heat preservation layer; each part is connected by inserting sleeve or screwed, to ensure the sealing and heat transfer efficiency. The heat dissipation fins are arranged horizontally with uniform spacing to enhance the air convection heat dissipation effect. The heat transfer rate is significantly improved. The whole system does not need external power driving, relies on natural convection to realize the circulation of cooling liquid, runs stably and is maintenance-free.

Claims

1. A laboratory condenser cooling device based on automatic circulation of water temperature difference, characterized in that, The utility model relates to a circulating cooling device for laboratory distillation / reflux condenser, comprising: a laboratory distillation / reflux condenser (1) provided with a heat exchange cavity (9) for containing a medium to be cooled, an outer wall of the heat exchange cavity (9) being sleeved with a sealed cooling cavity (2) for containing circulating cooling water, and a heat dissipation device (3) being a heat dissipation water tank exposed to air or a heat dissipation fin provided with a heat dissipation structure for realizing heat exchange between the cooling water and the atmosphere; an upper circulating pipe (4) having one end sealedly connected to the top of the cooling cavity (2) and the other end sealedly connected to the water inlet of the heat dissipation device (3) for leading out the heated water in the cooling cavity (2), and a lower circulating pipe (5) having one end sealedly connected to the water outlet of the heat dissipation device (3) and the other end sealedly connected to the bottom of the cooling cavity (2) for returning the cooled water in the heat dissipation device (3) to the cooling cavity (2), the cooling cavity (2), the upper circulating pipe (4), the heat dissipation device (3), and the lower circulating pipe (5) forming a closed circulation loop to realize automatic circulation of the cooling water based on the thermosyphon effect, that is, the cooling water in the cooling cavity (2) is heated and its density is reduced after absorbing heat of the condenser (1), and then the cooling water naturally rises to the heat dissipation device (3) through the upper circulating pipe (4), the heated water is cooled and its density is increased in the heat dissipation device (3), and then the cooled water returns to the bottom of the cooling cavity (2) through the lower circulating pipe (5) to complete the circulation cooling.

2. The cooling device according to claim 1, characterized in that, The heat dissipation surface of the heat dissipation device (3) is provided with a plurality of heat dissipation fins (7) uniformly distributed along the length direction of the heat dissipation device (3) for increasing the heat exchange area with the air.

3. The cooling device according to claim 1, characterized in that, The upper circulating pipe (4) and the lower circulating pipe (5) are made of a heat conduction coefficient ≤0.2 W / (m·K) heat preservation pipe material, and the outer wall of the pipe is wrapped with a heat preservation layer (6) made of polyurethane foam or rock wool material.

4. The cooling device according to claim 1, characterized by The cooling cavity (2) is tightly attached to the outer wall of the condenser (1), and the inner wall of the cooling cavity (2) is provided with a heat conduction coating (8) made of graphene coating or ceramic heat conduction coating and having a thickness of 0.1-0.5 mm.

5. The cooling device according to claim 1, characterized in that, The installation height of the heat dissipation device (3) is higher than the top of the cooling cavity (2), and the height difference is 10-50 cm for strengthening the driving force of the thermosyphon effect.

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