A PTC internal finned heating tube

Abstract

This utility model discloses a PTC internal finned heating tube, belonging to the technical field of heat pump components. A PTC internal finned heating tube includes a mounting nest, a pair of direct current tubes, a connecting pipe, and a PTC heating device. The direct current tubes are respectively arranged parallel to each other on both sides of the connecting pipe and communicate with the connecting pipe to form a flow channel for liquid circulation. The flow channel formed by the direct current tubes and the connecting pipe is detachably installed inside the mounting nest, which is detachably connected to a compressor to form an integrated structure. The PTC heating device is evenly distributed around the outer periphery of the direct current tubes, changing the heat transfer structure from PTC plate heat transfer to PTC tube heat transfer. Heat is transferred to the inside of the direct current tubes through contact, thereby heating the liquid inside the direct current tubes and effectively improving heating efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of heat pump component technology, and more specifically, relates to a PTC internal finned heating tube. Background Technology

[0002] With the popularization of new energy vehicles, the problem that heating by compressor alone is insufficient to meet heating demand has become increasingly prominent. The solution of combining electric compressors with PTC heating has become the mainstream. At the same time, new challenges have been raised in the integration of PTC heating structure and electric compressor.

[0003] Existing PTC heating modules integrated with electric compressors use a flat plate structure. This PTC structure often has a large volume, which increases the overall size of the compressor when integrated, affecting its placement in new energy vehicles. Furthermore, the reduced thermal conductivity of the PTC heating module lowers its heating power, ultimately leading to decreased heating performance and reduced ride comfort in new energy vehicles. For example, a side-mounted integrated heating module electric compressor disclosed in Chinese invention patent literature (CN202410603038.1) integrates the heating module at the bottom of the control unit and connects it to the cover to form a heating chamber. This allows for uniform heating of the heat transfer medium during flow, enabling faster heating of the compressor and significantly improving its heating speed. However, this solution still does not solve the problem of excessively large PTC heating module size, and the heat transfer efficiency between the PTC heating element and the heat transfer medium is still limited by the direct contact area between the PTC heating element and the fluid, resulting in limited improvement in the overall heating performance of the compressor.

[0004] Therefore, we need a PTC internal finned heating tube with a simple structure that can improve the heating performance of the compressor. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a PTC internal finned heating tube with a simple structure. It can improve the heating performance of the compressor by setting a number of uniformly arranged internal fins. At the same time, by optimizing the heat transfer structure, the heat transfer is changed from PTC plate heat transfer to PTC tube heat transfer, thereby improving the heating performance of PTC.

[0006] This utility model discloses a PTC internal finned heating tube, which includes an mounting nest, a pair of DC tubes, a connecting tube, and a PTC heating device; the DC tubes are respectively arranged parallel to both sides of the connecting tube and communicate with the connecting tube to form a flow channel for liquid circulation.

[0007] The flow channel formed by the DC tube and the connecting tube can be detachably installed inside the mounting nest, and the mounting nest can be detachably connected to the compressor to form an integrated whole structure.

[0008] The PTC heating devices are evenly distributed around the outer periphery of the DC tube and transfer heat to the inside of the DC tube through contact with the DC tube, thereby heating the liquid inside the DC tube.

[0009] As a further improvement of this utility model, several fin groups are fixedly installed inside the DC tube. Each fin group consists of multiple fins fixedly installed on the inner wall of the DC tube. The fin groups are evenly distributed around the inner wall of the DC tube to increase the heat transfer area of ​​the liquid.

[0010] As a further improvement of this utility model, the fins of adjacent fin groups inside the DC tube are staggered to increase the turbulence of the liquid flow, thereby increasing the contact area between the liquid and the fins and enhancing the heat exchange effect.

[0011] As a further improvement of this utility model, the top of the mounting nest has a through hole, and the outer periphery of the through hole is provided with an annular groove. A support plate is detachably installed on the upper part of the through hole; the lower part of the support plate is provided with an annular boss, which fits into the annular groove and is used to install the support plate on the top of the mounting nest.

[0012] As a further improvement of this utility model, an interface end is detachably installed on the side of the DC tube away from the connecting tube, and the support plate has a liquid inlet and a liquid outlet; the interface end is respectively set at the liquid inlet and the liquid outlet to ensure the stability of the DC tube and the connecting tube installed inside the mounting nest.

[0013] As a further improvement of this utility model, an installation groove is provided at the lower part of the interface end, which is detachably connected to the upper part of the DC tube; a sealing ring is also provided inside the installation groove, which is located between the inner wall of the installation groove and the inner wall of the upper part of the DC tube, and is used to form a seal to prevent liquid leakage inside the DC tube.

[0014] As a further improvement of this utility model, the PTC heating device includes a pair of insulating layers symmetrically arranged on the outer wall of the DC tube. Electrodes and heating circuits are embedded inside the insulating layers, and the electrodes are electrically connected to the heating circuits. The control electrode is energized, thereby increasing the temperature of the PTC heating device through the heating circuit, so as to achieve the purpose of uniformly heating the liquid inside the DC tube.

[0015] Compared to existing technologies, the advantages of this utility model are as follows: The PTC internal finned heating tube of this application optimizes the heat transfer structure, changing heat transfer from a PTC plate to a PTC tube. The PTC heating element is evenly distributed around the outer periphery of the DC tube, improving both heat transfer uniformity and efficiency, thus enhancing the PTC heating performance. By uniformly distributing fins along the inner wall of the DC tube, the heat transfer area of ​​the liquid is increased. The staggered arrangement of fins in adjacent fin groups within the DC tube increases the turbulence of the liquid flow, thereby increasing the contact area between the liquid and the fins and enhancing the heat exchange effect. The through-hole and annular groove at the top of the mounting nest, combined with the fitting design of the support plate and annular boss, provide more stable support for heating the liquid inside the DC tube, ensuring the overall structural stability of the device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a cross-sectional structure of a PTC internal finned heating tube according to the present invention; Figure 2 This is an enlarged schematic diagram of the structure at point A of this utility model; Figure 3 This is an enlarged schematic diagram of the structure at point B of this utility model; Figure 4 This is a schematic diagram of the cross-sectional structure of the support plate of this utility model; Figure 5 This is a schematic diagram of the structure of the PTC heating device of this utility model.

[0017] Explanation of the labels in the diagram: 1. Mounting nest, 11. Through hole, 12. Annular groove, 2. DC tube, 21. Fin assembly, 22. Interface end, 221. Mounting groove, 3. Connecting tube, 4. PTC heating device, 41. Insulation layer, 42. Electrode, 43. Heating circuit, 5. Compressor, 6. Support plate, 61. Annular boss, 62. Liquid inlet, 63. Liquid outlet, 7. Sealing ring. Detailed Implementation

[0018] Specific Implementation Example 1: Please refer to Figures 1-5 A PTC internal finned heating tube includes an mounting nest 1, a pair of DC tubes 2, a connecting tube 3, and a PTC heating device 4; the DC tubes 2 are respectively arranged parallel to each other on both sides of the connecting tube 3 and are connected to the connecting tube 3 to form a flow channel for liquid to flow.

[0019] The flow channel formed by the DC pipe 2 and the connecting pipe 3 can be detachably installed inside the mounting nest 1. The mounting nest 1 is detachably connected to the compressor 5 to form an integrated whole structure, which facilitates installation and maintenance while improving the compactness and reliability of the system.

[0020] like Figure 2As shown, the PTC heating device 4 is evenly distributed around the periphery of the DC tube 2 in the form of a diaphragm. It heats the liquid inside the DC tube 2 by contacting the DC tube 2 and transferring heat to the inside of the DC tube 2. By tightly fitting the PTC heating device 4 around the DC tube 2, the volume occupied by the PTC heating device 4 is reduced, thereby avoiding the overall size of the compressor 5 being too large.

[0021] Specifically, the DC tube 2 can be formed by brazing several evenly arranged fins on the surface of a thin-walled steel plate, bending it into a cylinder, and then welding it at the connection point.

[0022] Specifically, several fin groups 21 are fixedly installed inside the DC tube 2. Each fin group 21 consists of multiple fins fixedly installed on the inner wall of the DC tube. The fin groups 21 are evenly distributed around the inner wall of the DC tube 2. They heat the liquid inside the DC tube 2 by receiving heat conducted by the PTC heating device 4. The arrangement of the fin groups 21 increases the heat transfer area of ​​the liquid and promotes uniform heat distribution, thereby improving the heat exchange efficiency.

[0023] Specifically, such as Figure 5 The fins of adjacent fin groups 21 inside the DC tube 2 are arranged in an alternating manner, so that the liquid can frequently come into contact with the fins when flowing, thereby increasing the turbulence of the liquid flow, increasing the contact area between the liquid and the fins, and thus enhancing the heat exchange effect.

[0024] Specifically, such as Figure 3 The mounting nest 1 shown has a through hole 11 at the top, and an annular groove 12 is provided on the outer periphery of the through hole 11. A support plate 6 is detachably installed on the upper part of the through hole 11. The lower part of the support plate 6 is provided with an annular boss 61, which fits into the annular groove 12 and is used to install the support plate 6 on the top of the mounting nest 1.

[0025] Specifically, such as Figure 4 The DC tube 2 shown is detachably mounted with an interface end 22 on the side away from the connecting tube 3. The support plate 6 has an inlet 62 and an outlet 63. The interface end 22 is respectively located at the inlet 62 and the outlet 63 to ensure the stability of the DC tube 2 and the connecting tube 3 inside the mounting nest 1.

[0026] Specifically, the lower part of the interface end 22 has a mounting groove 221, which is detachably connected to the upper part of the DC tube 2; the mounting groove 221 is also provided with a sealing ring 7, which is located between the inner wall of the mounting groove 221 and the upper inner wall of the DC tube 2, and is used to form a seal to prevent liquid leakage in the DC tube 2.

[0027] Specifically, such as Figure 5The PTC heating device 4 shown includes a pair of insulating layers 41 symmetrically arranged on the outer wall of the DC tube 2. An electrode 42 and a heating circuit 43 are embedded inside the insulating layer 41. The electrode 42 and the heating circuit 43 are electrically connected. By controlling the electrode to be energized, the temperature of the PTC heating device 4 is increased through the heating circuit, so as to achieve the purpose of uniformly heating the liquid inside the DC tube 2.

[0028] During use, the electrodes of the PTC heating device 4 are turned on, and the liquid output from the compressor 5 flows into the DC pipe 2 through the interface end 22 of the DC pipe 2 on the side where the liquid inlet 62 is located. After the electrode 42 is turned on, the heating circuit 43 generates heat and conducts it to the fin surface of the fin assembly 21. The fins transfer heat through direct contact with the liquid inside the DC pipe 2. The heated liquid inside the DC pipe 2 is transported through the connecting pipe 3 to the DC pipe 2 on the side where the liquid outlet 63 is located for reheating. Finally, it is output from the top of the DC pipe 2 on this side to the operating stage of the compressor 5.

[0029] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. A PTC finned heating tube, characterized by, Includes a mounting nest (1), a pair of DC tubes (2), a connecting tube (3) and a PTC heating device (4); the DC tubes (2) are respectively arranged parallel to both sides of the connecting tube (3) and are connected to the connecting tube (3) to form a flow channel for the flow of liquid; The flow channel formed by the DC tube (2) and the connecting tube (3) can be detachably installed inside the mounting nest (1), and the mounting nest (1) can be detachably connected to the compressor (5); The PTC heating device (4) is evenly distributed around the outside of the DC tube (2) and is used to heat the liquid inside the DC tube (2).

2. The PTC internal finned heating tube according to claim 1, characterized in that, The DC tube (2) has several fin groups (21) fixedly installed inside. Each fin group (21) consists of multiple fins fixedly installed on the inner wall of the DC tube (2). The fin groups (21) are evenly distributed around the inner wall of the DC tube (2) to increase the heat transfer area of ​​the liquid.

3. A PTC internal finned heating tube according to claim 2, characterized in that, The fins of adjacent fin groups (21) inside the DC tube (2) are staggered to improve the turbulence of the liquid flow and enhance the heat exchange effect.

4. A PTC internal finned heating tube according to claim 1, characterized in that, The mounting nest (1) has a through hole (11) at the top, and an annular groove (12) is provided on the outer periphery of the through hole (11). A support plate (6) is detachably installed on the upper part of the through hole (11); the support plate (6) has an annular boss (61) at the lower part, and the annular boss (61) fits into the annular groove (12) for installing the support plate (6).

5. A PTC internal finned heating tube according to claim 4, characterized in that, The DC tube (2) has an interface end (22) that can be detachably installed on the side away from the connecting tube (3). The support plate (6) has an inlet (62) and an outlet (63). The interface end (22) is respectively located at the inlet (62) and the outlet (63) to ensure the stability of the DC tube (2) and the connecting tube (3) inside the installation nest.

6. A PTC internal finned heating tube according to claim 5, characterized in that, The lower part of the interface end (22) has an installation groove (221) which is detachably connected to the upper part of the DC tube (2); the installation groove (221) is also provided with a sealing ring (7), which is located between the inner wall of the installation groove (221) and the upper inner wall of the DC tube (2) to form a seal to prevent liquid leakage in the DC tube (2).

7. A PTC internal finned heating tube according to claim 1, characterized in that: The PTC heating device (4) includes a pair of insulating layers (41) symmetrically arranged on the outer wall of the DC tube (2). An electrode (42) and a heating circuit (43) are embedded inside the insulating layer (41), and the electrode (42) and the heating circuit (43) are electrically connected.

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