Evaporator assembly for new energy refrigerated truck with heating function

Abstract

The utility model provides a kind of evaporator assembly for new energy refrigeration car with heating function, including fin, refrigerant pipeline, heating pipeline and heater, the refrigerant pipeline and the heating pipeline are connected in the fin, the hot medium is circulated in the heating pipeline, the heating pipeline adopts closed circulation's pipeline, and the heater is used to heat the hot medium. The refrigerant pipeline and the heating pipeline are connected in the fin in the application, and the hot medium heated by the heater is fully contacted with the fin in circulating pipeline, so that the fin assists the heating pipeline to complete heat exchange, the hot medium can be more efficiently heat-exchanged by the fin, and the heat of the hot medium in the heating pipeline during heating and defrosting can be directly transmitted to the fin, and the efficiency of heat exchange is high.

Description

Technical Field

[0001] This utility model relates to the field of evaporators, specifically to an evaporator assembly with heating function for new energy refrigerated vehicles. Background Technology

[0002] In recent years, the cold chain transportation sector has seen a transformation in vehicle types. Traditional fuel-powered refrigerated trucks are being gradually replaced by new energy vehicles. Compared to fuel-powered refrigerated trucks, new energy refrigerated trucks have lower operating costs and offer greater economic benefits. Traditionally, refrigerated trucks primarily function as freezers and refrigerators. However, there are also orders for special foods, medicines, and fresh fruits and vegetables that require maintaining a temperature range of 2℃-8℃ regardless of external environmental conditions. In these cases, new energy refrigeration units need to be equipped with heating functions. Furthermore, refrigeration units must have defrosting capabilities. Whether using hot air defrosting or electric defrosting, it's crucial to promptly remove frost from the evaporator fins to ensure the refrigeration unit can continuously cool the interior of the truck. If hot air defrosting is used, the ambient temperature cannot be too low; otherwise, in extremely low temperatures, the heat will quickly dissipate into the outside air during defrosting, resulting in poor defrosting performance.

[0003] Therefore, refrigerated trucks in some extremely cold regions must be equipped with electric heaters. The heating function of common new energy refrigeration units is achieved by configuring PTC heating tubes or electric heating rods, etc., to heat the evaporator air outlet, the bottom of the evaporator, or the rear of the circulating fan, and the circulating fan carries away the heat to achieve heating.

[0004] However, all existing solutions have significant technical drawbacks. When heating is required, they all require the assistance of circulating air. The contact area between the circulating air and the heater or heating element is limited, resulting in low heat transfer efficiency and poor heating effect. This can further lead to heat accumulation in the heater or heating element. When defrosting is required, the heater placed at the bottom of the evaporator needs to rely on the rising hot air to heat the air between the fins, which also suffers from low heat transfer efficiency. In addition, the heater placed at the rear of the circulating fan needs to rely on the circulating air to blow hot air onto the fins for defrosting. This hot air will enter the passenger compartment and affect the temperature inside the passenger compartment. The heater placed at the evaporator outlet cannot complete the defrosting.

[0005] In order to solve the above problems, people have been seeking an ideal technological solution. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing an evaporator assembly with heating function for new energy refrigerated vehicles, enabling the heater to directly heat the evaporator fins through heating pipes, thus efficiently completing defrosting or heating.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: it includes fins, refrigerant pipelines, heating pipelines, and a heater. The refrigerant pipelines and the heating pipelines are both connected to the fins. A heat medium flows through the heating pipelines. The heating pipelines adopt a closed-loop circulation system. The heater is used to heat the heat medium.

[0008] Thus, the heater is not limited by ambient temperature conditions when heating and defrosting. Furthermore, both the refrigerant lines and the heating lines are connected to the fins. The heat medium heated by the heater fully contacts the fins within the circulation lines, allowing the fins to assist the heating lines in completing heat exchange. The heat medium can exchange heat more efficiently through the fins: during heating, the large contact area between the circulating air and the fins results in high heat exchange efficiency and thus high heating efficiency, effectively removing heat from the heating lines to prevent heat accumulation; during defrosting, the heat from the heat medium in the heating lines can be directly transferred to the fins for defrosting, resulting in high defrosting efficiency. Defrosting does not rely on a circulating fan, therefore it does not affect the temperature of the passenger compartment.

[0009] Based on the above, the heat transfer medium is heat transfer oil, the heater is installed at the bottom of the heating pipeline, and the heat transfer oil expands and flows within the heating pipeline when heated.

[0010] In this way, when the heat transfer oil expands due to heat, the heated heat transfer oil will become thinner and lighter and will float up due to buoyancy, while the unheated heat transfer oil will sink due to gravity. Convection is formed in the closed-loop heating pipe, so that heat is circulated and heat transfer is completed.

[0011] Based on the above, the amount of heat transfer oil added is less than 100% of the volume of the heating pipeline.

[0012] Based on the above, the amount of heat transfer oil added is set to 70% of the volume of the heating pipeline.

[0013] In this way, the remaining space inside the heating pipe, excluding the heat transfer oil, is reserved for expansion, reducing the pressure impact after the heat transfer oil expands and ensuring that the pressure resistance of the heating pipe meets safety requirements.

[0014] Based on the above, the heater uses a DC electric heating rod disposed inside the heating pipe.

[0015] In this way, the DC heating rod can directly contact the heat transfer oil used as the heat medium for heating, which has high heating efficiency, is conducive to the generation of convection, and the heater located inside the heating pipe can reduce the space occupied.

[0016] Based on the above, the evaporator assembly also includes an evaporator frame, and the heating pipes are located inside the evaporator frame.

[0017] In this way, the evaporator assembly does not take up any additional space in the passenger compartment.

[0018] Based on the above, a temperature switch is provided on the heating pipeline to monitor the temperature of the heat medium in order to prevent the medium temperature in the refrigerant pipeline from becoming too high.

[0019] This avoids the expansion or phase change of the heat medium in the refrigerant pipeline caused by the heat medium heating the medium through the fins during heating, which would otherwise lead to an excessive increase in pressure in the refrigerant pipeline.

[0020] Based on the above, the heating pipeline includes a heating coil, which includes a finned heating copper tube and a heating U-shaped tube, wherein the finned heating copper tube is an internally threaded copper tube.

[0021] In this way, the heating coil can fully exchange heat through the fins, and the internally threaded copper tube also facilitates heat exchange between the heat medium and the fins.

[0022] Based on the above, the heating coil also includes a manifold, the finned heating copper tubes on the heating coil are arranged in layers, the beginning and end of the heating coil are connected by the vertically arranged manifold, and the heater is installed at the bottom intersection of the manifold and the heating coil.

[0023] In this way, the manifold forms a loop with the heating coil, which is beneficial for the heat transfer oil to float up in the manifold and generate convection when it expands due to heat.

[0024] Based on the above, the heating coil also includes a manifold, and the first and last ends of the multi-layered heating coil are connected by two vertically arranged manifolds, and the heater is installed at the bottom of the manifold.

[0025] In this way, the two manifolds connect the multi-layer heating coils to form parallel loops. The manifold with the heater is conducive to the heat transfer oil floating up in the manifold when it is heated and expands, thus generating convection. The other manifold is conducive to the return of the heat transfer oil. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present utility model; Figure 2 This is a schematic diagram of the overall structure of another embodiment of the present invention; Figure 3 yes Figure 2 Detailed structural diagram of some parts of the structure; In the figure, the attached labels are as follows: fin 1, refrigerant line 2, finned refrigerant copper tube 21, refrigerant U-tube 22, distributor 23, manifold 24, heating line 3, finned heating copper tube 31, heating U-tube 32, manifold 33, collector 34, temperature switch 35, oil injection valve 36, oil drain valve 37, heater 4, circulating fan 5, evaporator frame 6. Detailed Implementation

[0027] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0028] Example 1 like Figures 1-3 As shown, the evaporator assembly for a new energy refrigerated vehicle with heating function in this embodiment includes fins 1, refrigerant pipes 2, heating pipes 3, and heaters 4. Both refrigerant pipes 2 and heating pipes 3 are connected to fins 1. Both refrigerant pipes 2 and heating pipes 3 can complete heat exchange through fins 1. The heat exchange area is large and the heat exchange efficiency is high. Heat medium flows in heating pipes 3. Heating pipes 3 adopt a closed-loop circulation pipe. Heater 4 is used to heat the heat medium. The heated heat medium forms a circulation in heating pipes 3 to heat fins 1.

[0029] Thus, during heating, the heating pipe 3 can complete heat exchange through the fins 1, with the fins 1 assisting in heating, resulting in high heating efficiency. Moreover, because the fins 1 can complete heat transfer more evenly, the heat at the root of the fins 1 is more uniform, thus avoiding local heat accumulation on the fins 1 or heating pipe 3 during heating, which could lead to overheating and make the evaporator's outlet air temperature more gentle. During defrosting, the heat of the heat medium in the heating pipe 3 can be directly transferred to the fins 1, resulting in higher heat transfer efficiency and more uniform heat transfer. The fins 1 will quickly use the heat in the heat medium to heat up themselves, melting the ice or frost on the surface of the fins 1, thus defrosting the fins 1 with high defrosting efficiency.

[0030] like Figure 2 As shown, the evaporator assembly for new energy refrigerated vehicles with heating function also includes a circulating fan 5 and an evaporator frame 6. The evaporator frame 6 uses the circulating fan 5 as the air inlet. After the circulating air enters the evaporator frame 6 from the air inlet, it is discharged from the air outlet of the evaporator frame 6 after heat exchange through the fins 1, thereby achieving cooling or heating.

[0031] In contrast, in existing technologies, heating pipes 3 are typically placed at the bottom of fins 1, or heating pipes 3 / heaters 4 are placed between the circulating fan 5 and fins 1, or heating pipes 3 / heaters 4 are placed at the air outlet of the evaporator frame 6. Obviously, such placement of heating pipes 3 / heaters 4 increases the internal air resistance of the evaporator, and the lack of fins to assist heat exchange results in lower heating or defrosting efficiency. In this embodiment, heating pipes 3 / heaters 4 do not interfere with the evaporator outlet air outlet, do not increase air resistance, do not affect the airflow, and minimize the impact on cooling. In some other embodiments, increasing the heat exchange area of ​​fins 1 by adding heating pipes 3 can also be used for heat exchange and can help improve cooling capacity.

[0032] The method of heater 4 in this embodiment for heating and defrosting is not limited by ambient temperature conditions. The heater can directly transfer heat to the fins 1 through the heat medium, avoiding unnecessary heat loss and making defrosting and heating more efficient.

[0033] Example 2 Based on Example 1, in this embodiment, heat transfer oil is used as the heat medium, and heater 4 is installed at the bottom of heating pipe 3. The heat transfer oil expands and flows in the heating pipe 3 when heated. This expansion flow is a pump-free natural convection flow. When the heat transfer oil expands when heated, the heated part becomes thinner and lighter and floats up due to buoyancy, while the unheated heat transfer oil sinks due to gravity. Convection is formed in the closed-loop heating pipe 3, thereby forming a heat cycle and completing heat transfer.

[0034] The heat transfer oil can be used in a working temperature range of -40℃ to 200℃. It can still be used normally within the current minimum temperature range of -30℃ to -25℃ required in refrigerated trucks.

[0035] In addition, when the heating pipe 3 is made of copper, the heat transfer oil will form an oxide layer on the inner wall of the pipe to inhibit corrosion and extend the service life of the heating pipe 3.

[0036] In other embodiments, the heated heat transfer oil can be forcibly circulated by pumping. Specifically, the oil filling line 3 of the evaporator assembly is connected to a heating oil tank, in which a heater 4 and heat transfer oil are installed. The heating oil tank is connected to the heating line 3 via an oil pump, and the heating oil tank is also connected to the circuit of the heating line 3. Essential valves are also installed to complete the forced circulation of the heat transfer oil by pumping.

[0037] Example 3 Based on Example 2, in this example, the amount of heat transfer oil added is less than 100% of the volume of the heating pipe 3. Preferably, the amount of heat transfer oil added is set to 70% of the volume of the heating pipe 3, and the remaining space is reserved for expansion, which can be filled with inert gases such as nitrogen. In actual use, the amount of heat transfer oil added is based on 70% of the volume of the heating coil. After being heated by electricity, the heat transfer oil expands due to heat and generates convection. However, after the heat transfer oil expands, the pressure in the heating pipe 3 is still less than 0.2 MPa. When the heating pipe 3 is made of copper pipe, its pressure resistance meets the safety requirements.

[0038] Example 4 Based on Embodiment 2, in this embodiment, the heater 4 adopts a DC electric heating rod installed inside the heating pipe 3. The heat transfer oil can flow through the DC electric heating rod, and the DC electric heating rod can directly contact the heat transfer oil as the heat medium for heating, which has a high heating efficiency and saves space occupied by the heater 4 compared to an external heater (such as an electromagnetic heating coil).

[0039] In other embodiments, other types of electric heaters (such as electromagnetic heating coils) may be used to heat the heat transfer oil.

[0040] Based on the above, the evaporator assembly also includes an evaporator frame 6, and the heating pipe 3 is located inside the evaporator frame 6, so that the evaporator assembly as a whole does not occupy additional space in the cargo box of the refrigerated truck.

[0041] Example 5 Based on Embodiment 1, Embodiment 2, Embodiment 3, or Embodiment 4, in this embodiment, a temperature switch 35 for monitoring the temperature of the heat medium is provided on the heating pipe 3. For example, the temperature switch 35 is a surface mount type, and the surface mount temperature switch 35 is set to disconnect above 60°C and reset below 40°C. Defining disconnection at 60°C can prevent the refrigerant in the refrigerant pipe 2 from absorbing heat and rising in temperature and pressure, causing excessive pressure. When the temperature exceeds 60°C, the temperature switch is triggered to disconnect, automatically cutting off the electric heating circuit. When the temperature falls below 40°C, the temperature switch automatically resets, restoring the electric heating power supply circuit.

[0042] Example 6 Based on the above embodiments, such as Figure 1 As shown, in this embodiment, the heating pipe 3 includes a heating coil, which includes a finned heating copper pipe 31 and a heating U-shaped pipe 32. The finned heating copper pipe 31 is an internally threaded copper pipe. When the heating U-shaped pipe 32 needs to be threaded through the fins 1, the heating U-shaped pipe 32 is also designed with an internally threaded copper pipe. The internally threaded copper pipe is beneficial for heat transfer.

[0043] The heating coil also includes a manifold 33. The finned heating copper tubes 31 on the heating coil are arranged in layers. The beginning and end of the heating coil are connected by the vertically arranged manifold 33. The upper and lower ends of the manifold 33 are respectively connected to the upper and lower ends of the heating coil. The manifold 33 makes the heating coil form a circuit. The heater 4 is installed at the bottom intersection of the manifold 33 and the heating coil. The heat transfer oil can flow through the heater 4. The temperature switch 35 is installed on the manifold 33. The manifold 33 facilitates the heat transfer oil to float up in the manifold 33 when it is heated and expands, thus generating convection.

[0044] The refrigerant pipeline 2 includes a refrigerant coil, which includes a finned refrigerant copper tube 21 and a refrigerant U-shaped tube 22. The finned refrigerant copper tube 21 and the refrigerant U-shaped tube 22 can be internally threaded copper tubes. The two ends of the refrigerant coil are connected to a distributor 23 and a collector 24, respectively, so that multiple refrigerant coils can be supplied with liquid.

[0045] The heating coil and refrigerant coil are arranged in parallel, which allows for... Figure 1 The arrangement shown is such that the two objects are coiled together in the same plane, or they can be arranged as shown in the figure. Figure 2 The figures shown are arranged in parallel front and back within two parallel planes.

[0046] Based on the above, an oil injection valve 36 is installed above the manifold 33, and an oil drain valve 37 is installed below the manifold 33.

[0047] The finned copper tubes used in the heating coil and the refrigerant coil can be made of the same material and with the fins 1 using an expansion tube process, resulting in better fit and higher heat exchange efficiency. The oil injection valve 36, the oil drain valve 37 and the DC electric heating rod are installed and fixed by threaded connection, which facilitates maintenance, replacement of heat transfer oil and replacement of DC electric heating rod.

[0048] Example 7 This embodiment differs from Embodiment 6, such as... Figure 2 , Figure 3 As shown, the heating coil no longer uses the manifold 33 to form a loop. The heating coil also includes a manifold 34. The first and last ends of the multi-layered heating coil are connected by two vertically arranged manifolds 34. The two manifolds connect the multi-layered heating coil to form a parallel loop. The heater 4 is installed at the bottom of the manifold 34.

[0049] Specifically, the heater 4 is installed at the bottom of one of the manifolds 34, and the temperature switch 35, the oil injection valve 36, and the oil drain valve 37 are installed on the other manifold 34.

[0050] In this embodiment, the manifold 34 with heater 4 facilitates the upward flow of heat transfer oil in the manifold 33 when the heat transfer oil expands due to heat, thereby generating convection. The other manifold 34 facilitates the return flow of heat transfer oil.

[0051] In this embodiment, the finned heating copper tube 31 and the finned refrigerant copper tube 21 are staggered, and the heating coil and the refrigerant coil can be formed together in the same plane on the fins 1. According to the above arrangement, although the length of the evaporator is increased, the cross-sectional dimensions of the evaporator change little. Therefore, the shape and size of the manifold of the heating coil can be fixed, and the power and size of the DC electric heating rod used in conjunction can also be standardized, reducing the cost of the product.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. An evaporator assembly for a new energy refrigerated truck with heating function, characterized in that, It includes fins (1), refrigerant lines (2), heating lines (3) and heaters (4). The refrigerant lines (2) and the heating lines (3) are both connected to the fins (1). The heating lines (3) contain heat medium. The heating lines (3) are closed-loop pipelines. The heaters (4) are used to heat the heat medium.

2. The evaporator assembly with heating function for new energy refrigerated trucks according to claim 1, characterized in that, The heat transfer medium is heat transfer oil, and the heater (4) is installed at the bottom of the heating pipe (3). The heat transfer oil expands and flows in the heating pipe (3) when heated.

3. The evaporator assembly with heating function for new energy refrigerated trucks according to claim 2, characterized in that, The amount of heat transfer oil added is less than 100% of the volume of the heating pipe (3).

4. The evaporator assembly with heating function for new energy refrigerated trucks according to claim 3, characterized in that, The amount of heat transfer oil added is set to 70% of the volume of the heating pipe (3).

5. The evaporator assembly with heating function for new energy refrigerated trucks according to claim 2, characterized in that, The heater (4) uses a DC electric heating rod installed inside the heating pipe (3).

6. The evaporator assembly with heating function for new energy refrigerated trucks according to claim 5, characterized in that, The evaporator assembly also includes an evaporator frame (6), and the heating pipe (3) is located inside the evaporator frame (6).

7. The evaporator assembly with heating function for new energy refrigerated trucks according to claim 2, characterized in that, The heating pipe (3) is equipped with a temperature switch (35) for monitoring the temperature of the heat medium to prevent the medium temperature in the refrigerant pipe (2) from being too high.

8. The evaporator assembly with heating function for new energy refrigerated trucks according to any one of claims 2-7, characterized in that, The heating pipeline (3) includes a heating coil, which includes a finned heating copper tube (31) and a heating U-shaped tube (32). The finned heating copper tube (31) is an internally threaded copper tube.

9. The evaporator assembly with heating function for new energy refrigerated trucks according to claim 8, characterized in that, The heating coil also includes a manifold (33), and the finned heating copper tubes (31) on the heating coil are arranged in layers. The beginning and end of the heating coil are connected by the vertically arranged manifold (33), and the heater (4) is installed at the bottom intersection of the manifold (33) and the heating coil.

10. The evaporator assembly with heating function for new energy refrigerated trucks according to claim 8, characterized in that, The heating coil also includes a manifold (34). The first and last ends of the multi-layered heating coil are connected by two vertically arranged manifolds (34). The heater (4) is installed at the bottom of the manifold (34).

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