PTC water heating device

Abstract

The utility model belongs to the technical field of electric heaters, and particularly provides a PTC (Positive Temperature Coefficient) water heating device which comprises a lower water chamber, a PTC heating element and a middle shell, a first heat exchange medium runner is arranged in the middle shell; a second heat exchange medium runner is arranged in the lower water chamber; the middle shell is mounted at the top of the lower water chamber; the PTC heating element is installed between the middle shell and the lower water chamber, one side of the PTC heating element is tightly attached to the first heat exchange medium flow channel, and the other side of the PTC heating element is tightly attached to the second heat exchange medium flow channel. And the first heat exchange medium flow channel is communicated with the second heat exchange medium flow channel. According to the PTC water heater, the PTC heating element is locked between the two layers of runners, and a cooling medium firstly flows through the inner runner of the middle shell, then flows into the inner runner of the lower water chamber through the runner of the middle shell, and then passes through the two layers of runners in sequence to realize sufficient heat exchange with the PTC heating element. According to the requirement for the heating performance of the new energy electric vehicle, electricity serves as energy, the cooling liquid is heated, warm air is provided for the interior of the vehicle through the evaporator, and the PTC water heating device for the new energy electric vehicle is safe, scientific, energy-saving and efficient.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric heaters, and particularly relates to a PTC water heating device. Background Art

[0002] The PTC heater uses a PTC ceramic as the core heating element, and has the advantages of automatic temperature control, a wide operating voltage range, no open flame, safety and reliability, and a long service life. Moreover, due to its special positive temperature coefficient characteristics, it is widely used in areas such as in-vehicle heating and battery heating of new energy vehicles. For a water heating device, its principle is to closely attach the PTC heater assembly to the water channel so that the heat generated by the PTC ceramic element is transferred to the water to be heated. The key to manufacturing a water heating device lies in transferring the heat generated by the PTC ceramic element through a cooling medium.

[0003] In the current PTC water heater flow channel technology, the common single-layer flow channel mode is inlet - S-shaped flow channel - outlet. This mode has a simple structure, which is convenient for design, manufacturing, and installation, but it is difficult to fully utilize the heat energy generated by the heating chip. Therefore, it is necessary to design a new PTC water heater applicable to new energy electric vehicles to overcome the above problems. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the problem that the flow channel of the existing PTC water heater is difficult to fully utilize the heat energy generated by the heating chip.

[0005] To this end, the utility model provides a PTC water heating device, which includes a lower water chamber, a PTC heating element, and a middle shell; a first heat exchange medium flow channel is provided in the middle shell; a second heat exchange medium flow channel is provided in the lower water chamber; the middle shell is installed on the top of the lower water chamber; the PTC heating element (6) is installed between the middle shell and the lower water chamber, and one side of the PTC heating element is closely attached to the first heat exchange medium flow channel, and the other side is closely attached to the second heat exchange medium flow channel; the first heat exchange medium flow channel is communicated with the second heat exchange medium flow channel.

[0006] Specifically, the above PTC water heating device further includes a control module; the PTC heating element is electrically connected to the control module.

[0007] Specifically, the above PTC water heating device further includes a cover plate; a control chamber is formed between the cover plate and the middle shell; the control module is installed in the control chamber.

[0008] Specifically, a high-voltage connector interface and a low-voltage connector interface are provided on the control chamber; one end of the control module is connected to both the high-voltage connector interface and the low-voltage connector interface simultaneously.

[0009] Specifically, a high-voltage connector is installed on the above-mentioned high-voltage connector interface, and a low-voltage connector is installed on the low-voltage connector interface.

[0010] Specifically, the above-mentioned PTC water heating device further includes a PCB busbar; the PTC heating element is electrically connected to the control module through the PCB busbar.

[0011] Specifically, the above-mentioned PCB busbar is connected to the control module through a busbar insert.

[0012] Specifically, the above-mentioned middle shell includes an integrally formed water chamber and an electrical chamber; the first heat exchange medium flow channel is arranged in the water chamber; the PCB busbar is installed in the electrical chamber.

[0013] Specifically, the above-mentioned middle shell is provided with a heat exchange medium inlet communicating with the first heat exchange medium flow channel; the lower water chamber is provided with a heat exchange medium outlet communicating with the second heat exchange medium flow channel.

[0014] Specifically, the above-mentioned PTC heating element includes a heating strip; the pins of the heating strip are electrically connected to the control module.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0016] The PTC water heater provided by the present invention locks the PTC heating element between two layers of flow channels. The cooling medium first flows through the flow channel in the middle shell, flows into the flow channel in the lower water chamber through the flow channel in the middle shell, and passes through the two layers of flow channels in sequence to achieve full heat exchange with the PTC heating element. The PTC water heater meets the requirements for the heating performance of new energy electric vehicles. Using electricity as the energy source, it heats the coolant and provides warm air to the vehicle interior via the evaporator, providing a safe, scientific, energy-saving and efficient PTC water heating device for new energy electric vehicles.

[0017] The following will further elaborate on the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an exploded view of the PTC water heating device provided by the present invention.

[0019] Figure 2 is an assembled external view of the PTC water heating device provided by the present invention.

[0020] Figure 3 is another perspective exploded view of the PTC water heating device provided by the present invention.

[0021] Reference numerals: 1, cover plate; 2, control room; 3, middle shell; 301, water chamber; 302, electrical chamber; 303, heat exchange medium inlet; 4, lower water chamber; 401, heat exchange medium outlet; 5, lower housing; 6, PTC heating element; 7, low-voltage connector; 8, high-voltage connector; 9, busbar insert; 10, first heat sink; 11, second heat sink. Detailed implementation manners

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art shall fall within the protection scope of the present invention. It should be understood that although the terms "first", "second", etc. may be used herein to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer or part discussed below may be referred to as the second element, component, region, layer or part. Spatially related terms such as "below", "above", etc. may be used herein for the purpose of facilitating the description of the relationship between one element or feature and another element or feature. It can be understood that, in addition to the orientations shown in the figures, spatially relative terms also include different orientations of the device during use or operation. For example, if the device in the figure is flipped, the element or feature described as "below" will be oriented as "above" other elements or features. Therefore, the exemplary term "below" may include both above and below orientations. The device may be oriented (rotated 90 degrees or in other orientations), and the spatially related descriptors used herein are to be interpreted accordingly.

[0023] Meanwhile, in the embodiments of the present invention, when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it may be directly disposed on the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in the embodiments of the present invention are only for illustrative purposes and are not intended to limit the present invention.

[0024] Refer to Figures 1-3, the present utility model provides a PTC water heating device, which includes a lower water chamber 4, a PTC heating element 6 and a middle shell 3; a first heat exchange medium flow channel is provided in the middle shell 3; a second heat exchange medium flow channel is provided in the lower water chamber 4; the middle shell 3 is installed on the top of the lower water chamber 4; the PTC heating element 6 is installed between the middle shell 3 and the lower water chamber 4, and one side of the PTC heating element 6 is closely attached to the first heat exchange medium flow channel, and the other side is closely attached to the second heat exchange medium flow channel; the first heat exchange medium flow channel is communicated with the second heat exchange medium flow channel. When in use, power is supplied to the PTC heating element 6, the coolant enters the middle shell 3, flows into the second heat exchange medium flow channel through the first heat exchange medium flow channel, and exchanges heat with the PTC heating element 6 through two layers of coolant flow channels in sequence to complete the heating of the coolant. The heated coolant can provide warm air to the vehicle interior via the evaporator, providing a safe, scientific, energy-saving and efficient PTC water heating device for new energy electric vehicles.

[0025] The first heat exchange medium flow channel and the second heat exchange medium flow channel are preferably loop-shaped flow channels, such as S-shaped, to extend the flow path of the coolant and fully exchange heat.

[0026] Furthermore, the PTC water heating device further includes a control module; the PTC heating element 6 is electrically connected to the control module, and the PTC heating element 6 is controlled through the control module.

[0027] Specifically, the PTC water heating device further includes a cover plate 1; a control chamber 2 is formed between the cover plate 1 and the middle shell 3; the control module is installed in the control chamber 2. The cover plate 1 and the control chamber 2 are locked with the middle shell 3 by screws to form a sealed cavity to accommodate the control module.

[0028] Optionally, a lower shell 5 is provided below the lower water chamber 4, the lower water chamber 4 is installed in the lower shell 5, and the lower shell 5 is detachably connected to the middle shell 3, thereby forming a heating cavity that can accommodate the PTC heating element 6.

[0029] Preferably, the cover plate 1 is arranged above the middle shell 3, a first heat dissipation plate 10 is provided on the cover plate 1, the lower shell 5 is arranged below the middle shell 3, and a second heat dissipation plate 11 is provided below the lower shell 5 to prevent the overall overheating of the PTC water heating device.

[0030] Furthermore, a high-voltage connector 8 interface and a low-voltage connector 7 interface are provided on the control chamber 2; one end of the control module is simultaneously connected to the high-voltage connector 8 interface and the low-voltage connector 7 interface.

[0031] In a refined embodiment, a high-voltage connector 8 is installed on the interface of the high-voltage connector 8, and a low-voltage connector 7 is installed on the interface of the low-voltage connector 7. When the PTC water heating device works, the high-voltage connector 8 conducts the vehicle's high-voltage electricity to the control module, and the low-voltage connector 7 transmits the vehicle's control signal and low-voltage electricity to the control module. The control module controls and dynamically adjusts the working power of the PTC heating element 6 through the vehicle's control signal. The PTC heating element 6 heats the coolant, which can not only provide warm air for the vehicle interior but also provide a preheating and heat preservation function for the power battery, being safe, comfortable, energy-saving and efficient.

[0032] Furthermore, the PTC water heating device further includes a PCB busbar; the PTC heating element 6 is electrically connected to the control module through the PCB busbar. The PCB busbar is preferably connected to the control module through a busbar insert 9.

[0033] To improve the integrity of the PTC water heating device, the middle shell 3 includes an integrally formed water chamber 301 and an electrical chamber 302; the first heat exchange medium flow channel is arranged in the water chamber 301; the PCB busbar is installed in the electrical chamber 302.

[0034] Optionally, the control module includes a PCBA control board, and the PTC heating element 6 includes a heating strip. The pins of the heating strip are electrically connected to the PCBA control board. The pins of the heating strip extend into the electrical chamber 302, and a PCB busbar is arranged in the electrical chamber 302. The heating strip is connected to the PCBA control board in the control area through the busbar and high-voltage insert for current collection. The control board is connected to the high-voltage connector 8, the low-voltage connector 7, and components such as IGBTs to form a control area. An insulating board can also be used to separate the PCBA control board and the PCB busbar. By using the insulating board to block the heat between the PCB busbar and the PCBA control board, it can avoid heat transfer to the PCBA control board, resulting in too high a temperature of the PCBA control board, which is beneficial to improving the working stability and safety.

[0035] In an optimized embodiment, a heat exchange medium inlet 303 communicating with the first heat exchange medium flow channel is provided on the middle shell 3; a heat exchange medium outlet 401 communicating with the second heat exchange medium flow channel is provided on the lower water chamber 4. The coolant enters the PTC water heating device through the heat exchange medium inlet 303 on the middle shell 3, flows through the first heat exchange medium flow channel and the second heat exchange medium flow channel in sequence to exchange heat with the PTC heating element 6, and then flows out from the heat exchange medium outlet 401 of the lower water chamber 4 to the evaporator or other feasible downstream devices.

[0036] Embodiment 1:

[0037] This embodiment provides a PTC water heating device, including a cover plate 1, a middle shell 3, a lower water chamber 4, and a lower housing 5.

[0038] The cover plate 1 is installed above the middle shell 3 by screws, fixedly sealed with the middle shell 3 to form a control chamber 2, and a first heat dissipation plate 10 is provided on the cover plate 1. A PCBA control board is installed in the control chamber 2, and a high-voltage connector 8 interface and a low-voltage connector 7 interface are provided on the control chamber 2. A high-voltage connector 8 is installed on the high-voltage connector 8 interface, and a low-voltage connector 7 is installed on the low-voltage connector 7 interface.

[0039] The middle shell 3 includes an integrally formed water chamber 301 and an electrical chamber 302. An S-shaped first heat exchange medium flow channel is provided in the water chamber 301, and a PCB busbar is installed in the electrical chamber 302. A heat exchange medium inlet 303 communicating with the first heat exchange medium flow channel is provided on the middle shell 3.

[0040] One end of the PCBA control board is connected to both the high-voltage connector 8 interface and the low-voltage connector 7 interface, and the other end is connected to the PCB busbar through a busbar insert 9.

[0041] An S-shaped second heat exchange medium flow channel is provided in the lower water chamber 4. The lower water chamber 4 is locked with the middle shell 3 by screws to form a heating chamber between the two. The first heat exchange medium flow channel and the second heat exchange medium flow channel are respectively arranged on the upper and lower sides of the heating chamber. A heat exchange medium outlet 401 communicating with the second heat exchange medium flow channel is provided on the lower water chamber 4. A heating element is provided in the heating chamber, and the heating element is locked by screws and clamped between the two flow channels. The upper side of the heating element is in close contact with the first heat exchange medium flow channel, and the lower side is in close contact with the second heat exchange medium flow channel. The pins of the heating element extend into the electrical chamber 302 and are transferred to the PCBA control board in the control area through the PCB busbar and the busbar insert 9.

[0042] The lower housing 5 is arranged below the lower water chamber 4 and is detachably connected to the middle shell 3 by screws, making the PTC water heating device form a whole. A second heat dissipation plate 11 is provided under the lower housing 5 to prevent the overall overheating of the PTC water heating device.

[0043] The working process of the PTC water heating device is as follows: Connect the heat exchange medium outlet 401 of the lower water chamber 4 to the evaporator and supply power to the heating element. The coolant enters the first heat exchange medium channel through the heat exchange medium inlet 303 on the middle shell 3, flows into the second heat exchange medium flow channel through the first heat exchange medium flow channel, exchanges heat with the heating element through the two layers of coolant flow channels in sequence, completes the heating of the coolant, and the heat-exchanged coolant provides warm air for the vehicle interior through the evaporator.

[0044] During use, the high-voltage connector 8 conducts the vehicle's high-voltage electricity to the PCBA control board, the low-voltage connector 7 transmits the vehicle's control signal and low-voltage electricity to the PCBA control board. The PCBA control board controls and dynamically adjusts the working power of the heating element through the vehicle's control signal. The heating element heats the coolant, which can not only provide warm air for the vehicle interior but also provide preheating and heat preservation functions for the power battery, being safe, comfortable, energy-saving and efficient.

[0045] The above examples are only illustrative of the present utility model and do not constitute a limitation on the scope of protection of the present utility model. Any design identical or similar to the present utility model falls within the scope of protection of the present utility model.

Claims

1. A PTC water heating device, characterized in that: The invention comprises a lower water chamber (4), a PTC heating element (6) and a middle shell (3); a first heat exchange medium flow channel is provided in the middle shell (3); a second heat exchange medium flow channel is provided in the lower water chamber (4); the middle shell (3) is installed on the top of the lower water chamber (4); the PTC heating element (6) is installed between the middle shell (3) and the lower water chamber (4), and one side of the PTC heating element (6) is in close contact with the first heat exchange medium flow channel, and the other side is in close contact with the second heat exchange medium flow channel; the first heat exchange medium flow channel is connected to the second heat exchange medium flow channel.

2. The PTC water heating device according to claim 1, characterized in that: It also includes a control module; the PTC heating element (6) is electrically connected to the control module.

3. The PTC water heating device according to claim 2, characterized in that: It also comprises a cover plate (1); a control chamber (2) is formed between the cover plate (1) and the middle shell (3); and the control module is installed in the control chamber (2).

4. The PTC water heating device according to claim 3, characterized in that: The control room (2) is provided with a high-voltage connector (8) interface and a low-voltage connector (7) interface; one end of the control module is connected to both the high-voltage connector (8) interface and the low-voltage connector (7) interface.

5. The PTC water heating device according to claim 4, characterized in that: A high-voltage connector (8) is installed on the high-voltage connector (8) interface, and a low-voltage connector (7) is installed on the low-voltage connector (7) interface.

6. The PTC water heating device according to claim 2, characterized in that: It also comprises a PCB busbar; the PTC heating element (6) is electrically connected to the control module via the PCB busbar.

7. The PTC water heating device according to claim 6, characterized in that: The PCB busbar is connected to the control module via a busbar insert (9).

8. The PTC water heating device according to claim 6, characterized in that: The middle shell (3) comprises an integrally formed water chamber (301) and an electrical chamber (302); the first heat exchange medium flow channel is arranged in the water chamber (301); and the PCB busbar is installed in the electrical chamber (302).

9. The PTC water heating device according to claim 1, characterized in that: The middle shell (3) is provided with a heat exchange medium inlet (303) communicating with the first heat exchange medium flow channel; the lower water chamber (4) is provided with a heat exchange medium outlet (401) communicating with the second heat exchange medium flow channel.

10. The PTC water heating device according to claim 2, characterized in that: The PTC heating element (6) comprises a heating strip; a pin of the heating strip is electrically connected to the control module.

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