Sensor

Abstract

The utility model discloses a sensor which comprises a temperature sensing probe, and a thermistor is arranged in the temperature sensing probe. The injection molding shell is connected with the temperature sensing probe; the heat insulation flow blocking piece comprises a connecting part and a flow blocking part; wherein the connecting part is connected with the temperature sensing probe, the flow blocking part extends in the axial direction of the temperature sensing probe and comprises at least one flow blocking face, a distance exists between the flow blocking face and the temperature sensing probe, and the area projection from the connecting position of the temperature sensing probe and the connecting part to the end portion is arranged in the flow blocking face. The heat insulation flow blocking piece is connected to the temperature sensing probe to block the direct impact of cooling liquid on the temperature sensing probe, meanwhile, the distance exists between the flow blocking face and the temperature sensing probe, a certain space is provided for the temperature sensing probe to conduct heat transfer on the nearby cooling liquid, in addition, the flowing cooling liquid can be well guided through the structural arrangement of the flow blocking face, and the temperature sensing probe is protected from being damaged. The cooling liquid near the temperature sensing probe can reduce the range of flow pulsation, and the measurement precision is improved.

Description

Technical Field

[0001] This application relates to the technical field of automotive sensors, and particularly to a sensor. Background Art

[0002] The rapidly growing new energy vehicle industry has become a key industry in the country's intelligent manufacturing. More and more consumers have also accepted the concept of green travel and started to purchase new energy vehicles. However, at the same time, it cannot be ignored that more and more new energy vehicles have experienced accidents such as spontaneous combustion and fire. The vast majority of the reasons for these accidents are due to problems with the power battery. Therefore, the temperature monitoring and control adjustment of the power battery are related to the safety and service life of the power battery.

[0003] Currently, the temperature adjustment of the battery pack in new energy vehicles mainly relies on coolant circulation means. Among them, the temperature monitoring of the coolant can relatively quickly describe the working state of the battery and the surrounding environment. The conventional monitoring method is realized through sensors, which can timely feedback the monitoring data to the battery management system in real time. If the control threshold is exceeded, the vehicle owner can be reminded to avoid risks in a timely manner, and the data is recorded and fed back to the vehicle factory for upgrading.

[0004] During the temperature measurement of the coolant by existing sensors, the temperature sensing head is immersed in the coolant. A thermistor is provided inside the temperature sensing head, and the resistance value change of the thermistor is transmitted to the battery management system for regulation during driving. Generally, when the vehicle is in motion, the coolant in the battery pack is in continuous circulation. The temperature sensing head is usually made of a material with a relatively high thermal conductivity, which can transfer the temperature of the coolant to the internal thermistor. However, due to the flowing coolant, there will be a certain flow friction on the temperature sensing head, and the friction will generate a certain amount of heat energy, which will affect the actual temperature of the coolant transmitted by the temperature sensing head. Secondly, the flowing coolant will generate a certain flow pulsation, resulting in instability in the measured temperature. Utility Model Content

[0005] In order to improve the measurement accuracy of the sensor and reduce the influence of the flowing coolant on the monitoring value, this application provides a sensor.

[0006] The sensor provided by this application adopts the following technical solutions:

[0007] A sensor, comprising:

[0008] A temperature sensing probe, with a thermistor provided inside the temperature sensing probe;

[0009] An injection molded housing, connected to the temperature sensing probe; and

[0010] A heat insulation and flow blocking member, the heat insulation and flow blocking member including a connecting portion and a flow blocking portion;

[0011] Wherein, the connecting part is connected to the temperature sensing probe, the flow blocking part extends along the axial direction of the temperature sensing probe and the flow blocking part includes at least one flow blocking surface, there is a spacing between the flow blocking surface and the temperature sensing probe, and the area from the connection between the temperature sensing probe and the connecting part to the end is projected within the flow blocking surface.

[0012] By adopting the above technical solution, when the temperature sensing probe is immersed in the coolant, it begins to transfer the temperature of the nearby coolant to the internal thermistor. The heat insulation flow blocking member is immersed in the coolant together with the temperature sensing probe, blocking the direct impact of the flowing coolant on the temperature sensing probe and reducing the flow rate of the coolant near the temperature sensing probe. At the same time, there is a certain spacing between the flow blocking surface of the heat insulation flow blocking member and the temperature sensing probe without affecting the temperature sensing probe from transferring the temperature of the nearby coolant. Since the flow rate of the coolant near the temperature sensing probe is slowed down by the blocking of the flow blocking surface, the accuracy of the transmitted temperature can be improved. Secondly, the area of the flow blocking surface can completely cover the temperature sensing probe, ensuring that the flow rate of the coolant near the temperature sensing probe is effectively slowed down, and can also expand the area for transferring the temperature of the nearby coolant as much as possible. The heat insulation flow blocking member also has a certain heat insulation effect, which can reduce the temperature transfer between the heat insulation flow blocking member and the temperature sensing probe, and overall improve the measurement accuracy of the sensor.

[0013] Preferably, the flow blocking surface is an arc-shaped flow blocking surface.

[0014] By adopting the above technical solution, the setting of the arc-shaped flow blocking surface can effectively relieve the impact of the coolant and has a good effect of guiding and blocking the coolant, reducing the vibration during use.

[0015] Preferably, there are two flow blocking surfaces, and one side of the two flow blocking surfaces is connected at an angle, and the other side extends towards the temperature sensing probe.

[0016] By adopting the above technical solution, the connection between the two flow blocking surfaces forms an angle, and this angle can divide the flowing coolant, reducing the force-bearing area of the heat insulation flow blocking member.

[0017] Preferably, the connecting part has a snap ring, and the snap ring is rotatably connected to the outer wall of the temperature sensing probe.

[0018] By adopting the above technical solution, after the snap ring is rotatably connected to the temperature sensing probe, the direction of the flow blocking surface can be adjusted to suit the installation preset for different coolant flow directions.

[0019] Preferably, the snap ring includes a base body and first teeth provided on the inner ring of the base body, and the temperature sensing probe is provided with second teeth on the outer wall that can mesh with the first teeth.

[0020] By adopting the above technical solution, after the angle of the snap ring relative to the temperature sensing probe is set, the first tooth and the second tooth mesh with each other to limit the circumferential rotation of the two, reducing the circumferential creep of the entire heat insulation baffle during the impact of the coolant.

[0021] Preferably, the snap ring is provided with a deformation opening.

[0022] By adopting the above technical solution, the deformation opening facilitates the disassembly and assembly between the snap ring and the temperature sensing probe, and at the same time realizes the detachable connection between the heat insulation baffle and the temperature sensing probe, which is suitable for measurements under different working conditions.

[0023] Preferably, the injection molded housing and the temperature sensing probe are of an integrally injection molded connection structure.

[0024] By adopting the above technical solution, the injection molded housing and the temperature sensing probe are directly connected by using the injection molding process, and the injection molded housing is directly injection molded. The product process is simple, the cost is low and the overall quality is also lighter.

[0025] Preferably, the temperature sensing probe has a cavity with an opening on one side, the thermistor is received in the cavity, and a heat conductive adhesive is filled between the inner wall of the cavity and the thermistor; wherein, one end of the thermistor is connected with a wiring terminal, and one end of the wiring terminal extends towards the injection molded housing side and is partially injection molded and encapsulated in the injection molded housing.

[0026] By adopting the above technical solution, the cavity with an opening on one side can facilitate the entry of the injection molding material, better improve the connection firmness between the injection molded housing and the temperature sensing probe, and at the same time, the wiring terminal is integrally connected during the injection molding process, eliminating the assembly of the housing and the temperature sensing probe in the prior art and improving the production efficiency.

[0027] Preferably, the injection molded housing includes a main body portion and a threaded connection portion and a plug-in portion integrally formed and connected to both sides of the main body portion. The plug-in portion has a plug-in groove, and the end of the wiring terminal extends into the plug-in groove.

[0028] By adopting the above technical solution, when the threaded connection portion after injection molding is threadedly connected to the coolant pipeline, the connection between the metal pipeline and the plastic thread is realized, avoiding the wear caused by the connection between the metal thread and the metal pipeline in the prior art, and improving the service life of the entire sensor.

[0029] Preferably, the temperature sensing probe includes at least one first connecting keel section and at least one second connecting keel section disposed at the opening of the cavity. The second connecting keel section extends inwards and folds from one side towards the cavity; wherein, the first connecting keel section and the second connecting keel section are connected in the threaded connection portion.

[0030] By adopting the above technical solution, during the injection molding process of the injection molded housing, part of the injection molding material enters the cavity of the temperature sensing probe. At the same time, the first connecting keel and the second connecting keel can be encapsulated in the injection molded housing after injection molding to increase the contact area, and extend and connect in different directions, further improving the connection firmness between the injection molded housing and the temperature sensing probe.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. By connecting a heat insulation baffle on the temperature sensing probe to block the direct impact of the coolant on the temperature sensing probe. At the same time, there is a gap between the baffle surface and the temperature sensing probe, giving the temperature sensing probe a certain space for heat transfer to the nearby coolant. In addition, the structural setting of the baffle surface can better guide the flowing coolant, so that the coolant near the temperature sensing probe can reduce the range of flow pulsation and improve the measurement accuracy;

[0033] 2. Through the detachable connection form between the connecting part and the temperature sensing probe, the application range of the sensor is expanded. At the same time, the circumferential rotation limiting structure between the snap ring and the temperature sensing probe can limit the circumferential position while adjusting the circumferential position, improving the stability of use;

[0034] 3. By using the injection molding process to connect with the temperature sensing probe while forming the injection molded housing, the temperature sensing probe is provided with a cavity and the first keel section and the second keel section are arranged at the opening of the cavity to increase the contact area of the injection molding material, making the connection between the injection molded housing and the temperature sensing probe more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic structural diagram of the sensor in Embodiment 1;

[0036] Figure 2 It is a cross-sectional view of the sensor in Embodiment 1;

[0037] Figure 3 It is a schematic structural diagram of the temperature sensing probe in Embodiment 1;

[0038] Figure 4 It is an exploded view of the heat insulation baffle and the temperature sensing probe in Embodiment 1;

[0039] Figure 5 It is a plan view between the baffle surface and the temperature sensing probe in Embodiment 1;

[0040] Figure 6 It is a static diagram of the temperature sensing probe and the heat insulation baffle in the coolant in Embodiment 1;

[0041] Figure 7 It is an exploded view of the heat insulation baffle and the temperature sensing probe in Embodiment 2;

[0042] Figure 8 Schematic plan view between the baffle surface and the temperature sensing probe in Embodiment 3.

[0043] Description of reference numerals: 1. Temperature sensing probe; 11. Annular groove; 12. Cavity; 13. First connecting keel; 14. Second connecting keel; 15. Second engaging tooth; 2. Injection molded housing; 21. Main body part; 22. Threaded connecting part; 23. Insertion part; 231. Insertion slot; 3. Heat insulation baffle member; 31. Connecting part; 311. Substrate; 312. Deformation opening; 313. First engaging tooth; 32. Baffle part; 321. Baffle surface; 4. Thermistor; 41. Lead wire; 42. Wiring terminal; 5. Thermal conductive adhesive; 6. Cooling pipe; 61. Cooling liquid. Detailed implementation manners

[0044] The present application will be further described in detail below with reference to the accompanying drawings.

[0045] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation manners.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items. Embodiment 1

[0047] Refer to together Figure 1 With Figure 2 , a sensor includes a temperature sensing probe 1, an injection molded housing 2 connected to the temperature sensing probe 1, and a heat insulation baffle member 3. The temperature sensing probe 1 is generally cylindrical and made of a metal heat conductive material. During use, the temperature sensing probe 1 needs to be immersed in the medium to be measured for temperature.

[0048] Combined with Figure 3 , the injection molded housing 2 is formed by an injection molding process and is integrally injection molded and connected to the temperature sensing probe 1 during the injection molding process. Specifically, the injection molded housing 2 includes a main body part 21 and a threaded connecting part 22 and an insertion part 23 connected to both sides of the main body part 21. The temperature sensing probe 1 is connected to the threaded connecting part 22, and the insertion part 23 has an insertion slot 231.

[0049] The temperature sensing probe 1 has a cavity 12 with an opening on one side. A thermistor 4 is arranged in the cavity 12. The thermistor 4 and the temperature sensing probe 1 are encapsulated by a thermal conductive adhesive 5. One end of the thermistor 4 is connected with a lead 41, and one end of the lead 41 is connected with a terminal 42. The lead 41 extends from the threaded connection part 22 towards the plug-in part 23, and the terminal 42 is placed in the plug-in groove 231. The plug-in part 23 is docked with an external plug.

[0050] Meanwhile, in order to improve the connection reliability between the temperature sensing probe 1 and the injection molded housing 2, the temperature sensing probe 1 is provided with a notch on the outer peripheral wall of the opening of the cavity 12, and part of the outer wall extends towards the inside of the cavity 12 to form a second connecting keel 14. Adjacent second connecting keels 14 form a first connecting keel 13. The first connecting keel 13 and the second connecting keel 14 can extend into the injection molding material during the injection molding process to increase the contact area.

[0051] Refer to jointly Figure 4 With Figure 5 , the heat insulation and insulation part is made of heat insulation and insulation material, such as PC. The main structure includes a connecting part 31 and a flow blocking part 32. The connecting part 31 includes a snap ring. The snap ring includes a base body 311. One side of the base body 311 is cut to form a deformation opening 312. A ring groove 11 is formed on the outer peripheral wall of the temperature sensing probe 1 near the threaded connection part 22. The base body 311 is snapped into the ring groove 11 through the deformation opening 312, and the base body 311 and the ring groove 11 are in a transition fit connection. The snap ring can rotate relative to the temperature sensing probe 1 when subjected to a certain circumferential torque.

[0052] There is a certain distance between the flow blocking part 32 and the temperature sensing probe 1, and it extends towards the end of the temperature sensing probe 1 and exceeds the end. The flow blocking part 32 has a flow blocking surface 321, and the flow blocking surface 321 is an arc-shaped flow blocking surface 321. The radian of the arc-shaped flow blocking surface 321 is greater than 180°, so that the projection of the area of the temperature sensing probe 1 from the connecting part 31 to the end falls within the flow blocking surface 321.

[0053] Refer to Figure 6 , when the sensor of this embodiment is in use, the threaded connection part 22 is used to connect with the internal thread of the cooling pipe 6, and the temperature sensing probe 1 and the heat insulation and flow blocking part 3 are immersed in the coolant 61. During the installation process, the circumferential position of the flow blocking part 32 relative to the temperature sensing probe 1 is adjusted in advance by understanding the flow direction of the coolant 61 in the cooling pipe 6. Since the threaded connection part 22 will rotate when connecting with the cooling pipe 6, a mark can be made at the main body part 21 in advance to indicate the relative position of the flow blocking part 32, and then the circumferential angle of the flow blocking part 32 is adjusted according to the flow direction of the coolant 61, so as to ensure that the flow direction X of the coolant 61 is centered on the vertical plane of the flow blocking part 32 as much as possible.

[0054] Since the baffle portion 32 can block the direct impact of the coolant 61 on the temperature sensing probe 1, and there is a gap between the baffle portion 32 and the temperature sensing probe 1, the flow rate of the coolant 61 near the temperature sensing probe 1 is relatively slow. When the radian of the baffle surface 321 reaches a certain value, it can wrap the entire temperature sensing probe 1, making the coolant 61 near the temperature sensing probe 1 relatively static. At this time, the measured temperature value can reduce the deviation caused by the flow of the coolant 61, improving the measurement accuracy. Embodiment 2

[0055] Refer to Figure 7 , a sensor, different from that in Embodiment 1 in that a first engaging tooth 313 is provided on the inner circumferential wall of the base body 311, and a second engaging tooth 15 is provided in the annular groove 11 of the temperature sensing probe 1, and the first engaging tooth 313 and the second engaging tooth 15 can be engaged. In this case, when the circumferential position of the baffle portion 32 relative to the temperature sensing probe 1 is adjusted, the engagement of the first engaging tooth 313 and the second engaging tooth 15 can be used to limit the rotation of the entire heat insulation and flow guiding member relative to the temperature sensing probe 1, and better stability can be maintained against the impact of the coolant 61 during use. Embodiment 3

[0056] Refer to Figure 8 , a sensor, different from that in Embodiment 1 or Embodiment 2 in that the baffle portion 32 has two baffle surfaces 321 at a certain angle, and the other side of the baffle surface 321 extends in the radial direction away from the temperature sensing probe 1. In this structure, by blocking the impact of the coolant 61 by the baffle surface 321, the flow rate of the coolant 61 near the temperature sensing probe 1 can be reduced in a larger range, making the data measured by the temperature sensing probe 1 more accurate.

[0057] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A sensor, characterized in that: include: A temperature sensing probe (1), wherein a thermistor (4) is arranged inside the temperature sensing probe (1); An injection molded housing (2) connected to the temperature sensing probe (1); and A heat-insulating flow baffle (3), the heat-insulating flow baffle (3) comprising a connecting portion (31) and a flow baffle (32); The connecting portion (31) is connected to the temperature sensing probe (1), the baffle portion (32) is arranged to extend along the axial direction of the temperature sensing probe (1), and the baffle portion (32) comprises at least one baffle surface (321), a distance exists between the baffle surface (321) and the temperature sensing probe (1), and a region from a connection point between the temperature sensing probe (1) and the connecting portion (31) to an end portion is projected within the baffle surface (321).

2. A sensor according to claim 1, characterized in that: The flow-blocking surface (321) is an arc-shaped flow-blocking surface (321).

3. A sensor according to claim 1, characterized in that: The baffle surfaces (321) have two surfaces, one side of the two baffle surfaces (321) is connected to form an angle, and the other side extends towards the temperature sensing probe (1).

4. A sensor according to claim 1, characterized in that: The connecting portion (31) has a clamping ring, and the clamping ring is rotatably connected to the outer wall of the temperature sensing probe (1).

5. A sensor according to claim 4, characterized in that: The snap ring comprises a base (311) and a first latch tooth (313) arranged on the inner ring of the base (311); the temperature sensing probe (1) is provided with a second latch tooth (15) on the outer wall thereof which can mesh with the first latch tooth (313).

6. A sensor according to claim 4, characterized in that: The clamping ring is provided with a deformation opening (312).

7. A sensor according to claim 1, characterized in that: The injection-molded housing (2) and the temperature sensing probe (1) are an integrated injection-molded connection structure.

8. A sensor according to claim 7, characterized in that: The temperature sensing probe (1) has a cavity (12) with an opening on one side, the thermistor (4) is accommodated in the cavity (12), and a thermal conductive adhesive (5) is filled between the inner wall of the cavity (12) and the thermistor (4); wherein one end of the thermistor (4) is connected to a wiring terminal (42), one end of the wiring terminal (42) extends toward one side of the injection-molded housing (2) and is partially injection-molded and encapsulated in the injection-molded housing (2).

9. A sensor according to claim 8, characterized in that: The injection-molded housing (2) comprises a main body (21), and a threaded connection portion (22) and a plug-in portion (23) integrally formed on both sides of the main body (21); the plug-in portion (23) has a plug-in slot (231), and an end portion of the connection terminal (42) extends into the plug-in slot (231).

10. A sensor according to claim 9, characterized in that: The temperature sensing probe (1) comprises at least one first connecting keel (13) section and at least one second connecting keel (14) section disposed at the opening of the cavity (12), wherein the second connecting keel (14) section is folded and extended from one side toward the cavity (12); wherein the first connecting keel (13) section and the second connecting keel (14) section are connected in a threaded connection portion (22).

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