Supercooling water dynamic ice-making spiral supercooling evaporator

Abstract

The application discloses a spiral supercooling evaporator for dynamic ice making of supercooled water, which comprises a liquid storage tank for storing refrigerant, a spiral heat exchange pipe arranged in the liquid storage tank, and the spiral heat exchange pipe is submerged by the refrigerant; the inlet and outlet of the spiral heat exchange pipe are both located outside the liquid storage tank. By designing the shape of the heat exchange pipe into a spiral shape, adopting the spiral pipe type heat exchanger, the internal supercooled water flow velocity vector is constantly changed, the temperature of the boundary layer is changed, the defect of being too low is changed, the ice blocking is reduced, and the stability of the system is improved. The spiral heat exchange pipe is arranged in the low-temperature refrigerant, the surface heat exchange thermal resistance is reduced, the heat exchange capacity is enhanced, and the heat exchange area is reduced. In addition, for the supercooled water, stable heat exchange conditions are needed, the heat exchange mode of the refrigerant submerging the spiral heat exchange pipe can ensure that the heat exchange boundary of the supercooled water is always in a stable state, the stability of the system is improved, and the risk of ice blocking is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of supercooled water dynamic ice making, in particular to a spiral supercooling evaporator for supercooled water dynamic ice making. BACKGROUND

[0002] The supercooled water dynamic ice making technology has been widely used, but in the ice making process, the supercooled water is in a metastable state, and ice blocking is easily formed due to internal icing in the supercooler. At present, the commonly used supercooler is mainly a plate heat exchanger (such as patent ZL201220297793.4), in addition, the refrigerant cycle is usually in a dry cycle or in a way of using a secondary refrigerant cycle through the supercooler.

[0003] The problem of the plate heat exchanger in the heat exchange process is that in the heat exchange process along the wall surface, due to the effect of the boundary layer, the water temperature at the boundary layer is lower than the mainstream water temperature, which leads to the ice blocking easily formed at the boundary layer. If the spiral way is used, the speed vector of the supercooled water is changed, so that the temperature gradient of the supercooled water at the boundary is reduced, which is beneficial to reduce the risk of supercooled water icing. At present, the commonly used design method of the supercooler does not consider the influence of the supercooled water flow on the icing, but the influence of the flow on the supercooled water icing is objectively existing. In addition, the way of using the secondary refrigerant through the supercooler increases the intermediate stage heat exchange, so that the energy consumption is increased and the system performance is decreased. And the dry evaporation cycle using direct evaporation reduces the heat exchange performance due to the existence of the dryness. SUMMARY

[0004] In order to solve at least one technical problem existing in the above background art, the purpose of the present application is to provide a spiral supercooling evaporator for supercooled water dynamic ice making, so as to change the speed vector of the supercooled water at the wall boundary layer by the spiral method, thereby changing the residence time of the supercooled water at the wall.

[0005] To achieve the above-mentioned purpose, the technical scheme of the present application is:

[0006] A spiral supercooling evaporator for supercooled water dynamic ice making, comprising:

[0007] a liquid storage tank for storing refrigerant;

[0008] a spiral heat exchange pipe placed in the liquid storage tank, and the refrigerant submerges the spiral heat exchange pipe; the inlet and outlet of the spiral heat exchange pipe are both located outside the liquid storage tank.

[0009] Further, the total surface area A of the spiral heat exchange pipe satisfies the following conditions:

[0010] (m'·c / h)<A<(1.2·m'·c / h)

[0011] Wherein, m' is the water flow inside the spiral heat exchange pipe, c is the specific heat capacity of water, and h is the surface heat exchange coefficient of the spiral heat exchange pipe.

[0012] Further, the spiral heat exchange pipe is uniform in size, the inner surface of the pipe is polished, and the outer surface of the pipe is spot-welded with burrs.

[0013] Further, the liquid storage tank stores two-thirds of the volume of the refrigerant.

[0014] Further, the storage space in the liquid storage tank is in the shape of a cuboid.

[0015] Further, an oil return port is arranged at a position two-thirds of the height of the liquid storage tank, and the oil return port is connected to the compressor and controlled by an electromagnetic valve to start and stop the oil return.

[0016] Further, the refrigerant evaporation temperature is not lower than -6 DEG C, and is adjusted by the opening degree of the expansion valve.

[0017] Further, the outer diameter of the spiral heat exchange pipe is not less than 20 cm.

[0018] Further, the water temperature at the inlet of the spiral heat exchange pipe is 0 DEG C and above, and the water temperature at the outlet is -3 DEG C and above.

[0019] The inlet and outlet of the spiral heat exchange pipe are located at a position one-fourth of the height of the liquid storage tank.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] The spiral heat exchange pipe is placed in the low-temperature refrigerant, which reduces the surface heat exchange thermal resistance, enhances the heat exchange capacity, and reduces the heat exchange area. In addition, for supercooled water, stable heat exchange conditions are required, and the immersion full-liquid type heat exchange mode can ensure that the heat exchange boundary of the supercooled water is always in a stable state, which is beneficial to increase the stability of the system and reduce the risk of ice blockage.

[0022] The spiral pipe type heat exchanger changes the internal supercooled water flow velocity vector constantly, changes the temperature of the boundary layer, and reduces the risk of ice blockage, thereby improving the stability of the system. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The structure schematic view of the supercooled water dynamic ice-making spiral supercooling evaporator provided by the embodiment of the present application is shown in the figure.

[0024] Figure 2 The spiral heat exchange pipe small burr schematic view is shown in the figure.

[0025] In the figure: 101, refrigerant; 102, liquid storage tank; 103, spiral heat exchange pipe; 104, oil return port; 201, outer surface of spiral heat exchange pipe; 202, inner surface of spiral heat exchange pipe; 203, burr. DETAILED DESCRIPTION

[0026] EMBODIMENT

[0027] The technical solutions of the present application will be further described below in combination with the drawings and embodiments.

[0028] Reference Figure 1 As shown in the figure, the supercooled water dynamic ice-making spiral supercooling evaporator provided by the embodiment mainly comprises a liquid storage tank 102 and a spiral heat exchange pipe 103.

[0029] The low-temperature refrigerant 101 is stored in the liquid storage tank 102, the spiral heat exchange pipe 103 is placed in the liquid storage tank 102, the refrigerant 101 submerges the spiral heat exchange pipe 103, water flows through the inside of the spiral heat exchange pipe 103, the inlet and outlet of the spiral heat exchange pipe 103 pass through the liquid storage tank 102 and are sealed at the passing-through positions, that is, the inlet and outlet of the spiral heat exchange pipe 103 are located outside the liquid storage tank 102. The spiral heat exchange pipe 102 can be provided with one or more than one, and the specific number can be set according to the requirement, and the placement position can be vertical or horizontal, and it is required to ensure that the whole spiral heat exchange pipe 102 is immersed in the refrigerant 101.

[0030] As can be seen, by designing the shape of the heat exchange pipe into a spiral shape and adopting the spiral pipe type heat exchanger, the velocity vector of the internal supercooled water flow is constantly changed, the temperature of the boundary layer is changed to be too low, the disadvantage is overcome, the ice blocking is reduced, and the stability of the system is improved. The spiral heat exchange pipe is placed in the low-temperature refrigerant, the surface heat transfer resistance is reduced, the heat exchange capacity is enhanced, and the heat exchange area is reduced. In addition, for supercooled water, stable heat exchange conditions are required, and the heat exchange mode of submerging the spiral heat exchange pipe in the refrigerant can ensure that the heat exchange boundary of the supercooled water is always in a stable state, which is beneficial to increase the stability of the system and reduce the risk of ice blocking.

[0031] In a specific embodiment, the total surface area A of the spiral heat exchange pipe 103 satisfies the following condition:

[0032] (m'·c / h)<A<(1.2·m'·c / h)

[0033] Wherein m' is the water flow rate inside the spiral heat exchange pipe, c is the specific heat capacity of water, and h is the surface heat transfer coefficient of the spiral heat exchange pipe, which can be measured by experiment.

[0034] This design ensures that the heat exchange boundary of the cold water remains stable, guarantees that the heat exchange process is a small temperature difference heat exchange, and ensures that the outlet temperature after heat exchange is not too low. This helps to increase the stability of the system and reduce the risk of ice blockage.

[0035] In one specific embodiment, such as Figure 2 As shown, the spiral heat exchanger tube 103 is of uniform size. The inner surface 202 of the spiral heat exchanger tube is polished and coated with a superhydrophobic coating. Small burrs 203 are spot-welded onto the outer surface 201 of the spiral heat exchanger tube to increase the outer surface area. The outer diameter of the spiral heat exchanger tube 103 is not less than 20 cm to ensure the heat exchange effect. The inlet water temperature of the spiral heat exchanger tube is 0℃ or above, and the outlet water temperature is -3℃ or above.

[0036] In one specific embodiment, the aforementioned liquid storage tank 102 stores two-thirds of its volume of refrigerant 101 to ensure that the tank space can be utilized. The refrigerant 101 can be a heat transfer fluid, such as ethylene glycol, brine, or other low-temperature solutions. The evaporation temperature of the refrigerant 101 is not lower than -6°C. The cooling effect is ensured by adjusting the opening of the expansion valve. The storage space inside the liquid storage tank 102 is rectangular. An oil return port is located at two-thirds of the height of the liquid storage tank 102. The oil return port is connected to the compressor, and the start and stop of the oil return are controlled by a solenoid valve to recover oil from the refrigerant and avoid affecting the heat exchange effect. The inlet and outlet of the spiral heat exchange tube are located at one-quarter of the height of the liquid storage tank for ease of manufacturing.

[0037] The above embodiments are merely illustrative of the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made based on the essence of the content of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A supercooled water dynamic ice-making spiral supercooling evaporator, characterized by, The application relates to a refrigerant storage tank. The application relates to a refrigerant storage tank. The total surface area A of the spiral heat exchange pipe meets the following condition: (m'«c / h)<A<(1.2«m'«c / h) Wherein, m' is the water flow in the spiral heat exchange pipe, c is the specific heat capacity of water, and h is the surface heat exchange coefficient of the spiral heat exchange pipe. The spiral heat exchange pipe is uniform in size, the inner surface of the pipe is polished, the outer surface of the pipe is spot-welded with burrs, and the pipe is coated with a super-hydrophobic coating.

2. The supercooled water dynamic ice-making helical supercooling evaporator of claim 1, wherein, The refrigerant storage tank stores two-thirds of the volume of refrigerant.

3. The supercooled water dynamic ice-making helical supercooling evaporator of claim 1, wherein, The storage space in the refrigerant storage tank is cuboid.

4. The supercooled water dynamic ice-making spiral supercooling evaporator of claim 1 or 3, wherein, An oil return port is arranged at a position two-thirds of the height of the refrigerant storage tank, the oil return port is connected with a compressor, and the start and stop of the oil return is controlled by an electromagnetic valve.

5. The supercooled water dynamic ice-making helical supercooling evaporator of claim 4, wherein, The refrigerant evaporation temperature is not lower than -6 DEG C, and is adjusted by the opening degree of an expansion valve.

6. The supercooled water dynamic ice-making helical supercooling evaporator of claim 1, wherein, The outer diameter of the spiral heat exchange pipe is not less than 20 cm.

7. The supercooled water dynamic ice-making helical supercooling evaporator of claim 1, wherein, The water temperature at the inlet of the spiral heat exchange pipe is 0 DEG C and above, and the water temperature at the outlet of the spiral heat exchange pipe is -3 DEG C and above.

8. The supercooled water dynamic ice-making helical supercooling evaporator of claim 1, wherein, The inlet and outlet of the spiral heat exchange pipe are arranged at a position one-fourth of the height of the refrigerant storage tank.

9. The supercooled water dynamic ice-making helical supercooling evaporator of claim 4, wherein, ​

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