PTC temperature sensor

Abstract

The utility model discloses a PTC (Positive Temperature Coefficient) temperature sensor, which is connected with a sensor mounting piece and is used for detecting the temperature of cooling liquid, the sensor mounting piece is provided with a cooling liquid cavity and a detection hole communicated with the cooling liquid cavity, the PTC temperature sensor comprises a detection assembly, at least one sealing piece and a connecting assembly, the thermistor is arranged relative to the detection hole and can be inserted into the detection hole, the pin seat is connected to the thermistor, the sealing element is arranged between the thermistor and the circumferential inner wall of the detection hole and is used for sealing the thermistor and the circumferential inner wall of the detection hole, and the connecting assembly is connected to the pin seat and is detachably connected with the sensor mounting element. The pin seat and the thermistor are detachably connected to the sensor mounting piece. According to the utility model, the problem of poor sealing between the outer wall of the fastening piece and the wall of the internal thread hole on the mounting piece caused by threaded connection between the external thread on the outer wall of the fastening piece and the internal thread hole on the mounting piece can be effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature sensors, in particular to a PTC temperature sensor. Background Art

[0002] In order to solve the defects of temperature sensor leads and wiring length, relevant research came into being.

[0003] For example, the Chinese utility model patent application number is CN201820627600.4, and its name is: A temperature sensor, comprising a sensor housing, a temperature-sensing thermistor, and a pin connector, wherein the pin end of the pin connector is located inside the sensor housing and connected to the temperature-sensing thermistor, and the output end of the pin connector is located outside the sensor housing. The device is connected to the temperature measurement circuit via the pin connector, and can be uniformly connected to other sensors or off-board devices via a bus mode. The wiring is beautiful and highly flexible, effectively improving the ease of use of the temperature sensor. The user can better standardize and distribute the sensors, simplifying the measurement process and improving the accuracy of the detection. The lead wires used in the temperature sensor in the prior art can be eliminated, thereby solving the defect of customized wiring length. However, the device forms a threaded connection with the internal threaded hole on the mounting member through the external thread on the outer wall of the fastener. Not only is the rotating fastener inconvenient to install, but the sealing between the outer wall of the fastener and the wall of the internal threaded hole on the mounting member cannot be guaranteed.

[0004] Therefore, there is an urgent need for a PTC temperature sensor to solve the problem in the prior art that the external thread on the outer wall of the fastener forms a threaded connection with the internal threaded hole on the mounting piece, resulting in poor sealing between the outer wall of the fastener and the wall of the internal threaded hole on the mounting piece. Utility Model Content

[0005] The purpose of the present utility model is to overcome the above technical deficiencies and propose a PTC temperature sensor to solve the technical problem in the prior art that the outer thread on the outer wall of the fastener and the inner threaded hole on the mounting piece form a threaded connection, thereby causing poor sealing between the outer wall of the fastener and the wall of the inner threaded hole on the mounting piece.

[0006] In order to achieve the above technical purpose, the present invention adopts the following technical solutions:

[0007] The utility model provides a PTC temperature sensor connected to a sensor mounting member for detecting the temperature of a coolant. The sensor mounting member is provided with a coolant cavity and a detection hole communicating with the coolant cavity. The sensor is characterized in that it comprises:

[0008] A detection assembly, comprising a pin socket and a thermistor, wherein the thermistor is arranged relative to the detection hole and can be inserted into the detection hole, and the pin socket is connected to the thermistor;

[0009] at least one sealing member, the sealing member being disposed between the thermistor and the circumferential inner wall of the detection hole, and being used for sealing the thermistor and the circumferential inner wall of the detection hole; and

[0010] A connecting assembly is connected to the pin seat and is detachably connected to the sensor mounting piece, and is used to enable the pin seat and the thermistor to be detachably connected to the sensor mounting piece.

[0011] In some embodiments, the pin socket has two pins, which are arranged along the height direction of the pin socket, and one end of the pin is embedded in the pin socket and the other end is placed outside the top of the pin socket for electrical connection with an external device. The thermistor has two electrical connection ends, which are arranged in a one-to-one correspondence with the pins and are electrically connected to one end of the pins.

[0012] In some embodiments, the detection assembly further includes a detection shell and thermal grease. The detection shell covers the thermistor and is connected to the pin seat. The thermal grease is filled between the detection shell and the thermistor.

[0013] In some embodiments, the detection housing and the pin seat are connected by riveting.

[0014] In some embodiments, the detection shell is provided with an opening connected to its interior, the pin holder is formed with a connecting portion relative to the opening, and the connecting portion has a large diameter section and a small diameter section, the large diameter section of the connecting portion is arranged relative to the small diameter section close to the thermistor, the connecting portion is inserted into the opening, and the open end of the detection shell covers the large diameter section of the connecting portion.

[0015] In some embodiments, the detection assembly further includes a first sealing ring, which is disposed at the connection between the detection shell cover and the pin holder and is built into the detection shell.

[0016] In some embodiments, the detection component further includes a heat shrink sleeve, which is placed at the connection between one end of the pin and the connection end of the thermistor and is embedded in the thermal grease.

[0017] In some embodiments, at least one sealing groove is formed on the circumferential outer wall of the detection shell, and the sealing member is an elastic sealing ring. The elastic sealing ring sealing sleeve is provided on the inner wall of the sealing groove and abuts against the circumferential inner wall of the detection hole.

[0018] In some embodiments, there are two sealing grooves on the detection shell, the two sealing grooves are arranged at intervals along the length direction of the detection shell, and the sealing members are arranged in a one-to-one correspondence with the sealing grooves.

[0019] In some embodiments, the sensor mounting component is provided with at least one first connecting hole, the inner wall of the first connecting hole is formed with an internal thread, the circumferential side wall of the pin seat is formed with a frame, and the frame is provided with a second connecting hole relative to the first connecting hole. The connecting assembly also includes at least one fastening connection part, and the fastening connection part is arranged in a one-to-one correspondence with the second connecting hole. The threaded section of the fastening connection part passes through the second connecting hole and is threadedly connected to the first connecting hole, and the large diameter section of the fastening connection part abuts against the frame.

[0020] Compared with the prior art, the beneficial effects of the PTC temperature sensor provided by the present invention include: the thermistor is arranged relative to the detection hole of the sensor mounting part and is connected to the pin socket, and the thermistor can be inserted into the detection hole to detect the temperature in the cooling liquid cavity, at least one seal is provided between the thermistor and the circumferential inner wall of the detection hole, and the seal can seal the thermistor and the circumferential inner wall of the detection hole, the connecting assembly is connected to the pin socket and is detachably connected to the sensor mounting part, so that the pin socket and the thermistor can be detachably connected to the sensor mounting part. Compared with the existing technology, the sealing performance is improved by providing at least one seal between the thermistor and the circumferential inner wall of the detection hole, which can be sealed and connected to the circumferential inner wall of the thermistor and the detection hole. At the same time, a connecting component is used to realize a detachable connection between the pin holder, the thermistor and the sensor mounting part, instead of using the external thread on the outer wall of the fastener to form a threaded connection with the internal threaded hole on the mounting part. It is easy to operate and has a stable structure. It can solve the technical problem in the existing technology that the external thread on the outer wall of the fastener and the internal threaded hole on the mounting part form a threaded connection, resulting in poor sealing between the outer wall of the fastener and the wall of the internal threaded hole on the mounting part. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of a PTC temperature sensor provided by an embodiment of the present utility model;

[0022] Figure 2 This is a schematic diagram of a three-dimensional exploded structure of a PTC temperature sensor provided by an embodiment of the present utility model;

[0023] Figure 3 It is a schematic cross-sectional view of the structure of the detection assembly connected to at least one sealing member provided by an embodiment of the present utility model;

[0024] Figure 4 This is a schematic diagram of the cross-sectional structure of the detection shell before riveting provided by an embodiment of the utility model;

[0025] Figure 5 This is a schematic diagram of the cross-sectional structure of the detection shell after riveting provided by an embodiment of the utility model;

[0026] Figure 6 The present invention is a cross-sectional structural diagram of a PTC temperature sensor connected to a sensor mounting member provided by an embodiment of the present invention.

[0027] Description of reference numerals:

[0028] Sensor mounting member 1; cooling liquid chamber 11; detection hole 12; pin seat 21; thermistor 22; detection shell 23; sealing groove 231; thermal grease 24; first sealing ring 25; heat shrink sleeve 26; sealing member 3; connecting assembly 4; frame 41; fastening connection portion 42. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] In order to solve the technical problem that the outer thread on the outer wall of the fastener forms a threaded connection with the inner threaded hole on the mounting piece, resulting in poor sealing between the outer wall of the fastener and the wall of the inner threaded hole on the mounting piece, the utility model provides a PTC temperature sensor, which can realize that at least one seal 3 that can be sealed and connected to the circumferential inner wall of the thermistor 22 and the detection hole 12 is provided between the thermistor 22 and the circumferential inner wall of the detection hole 12 to improve the sealing performance, and at the same time, the connecting component 4 is used to realize a detachable connection between the pin holder 21 and the thermistor 22 and the sensor mounting piece 1, instead of using the outer thread on the outer wall of the fastener to form a threaded connection with the inner threaded hole on the mounting piece, which is easy to operate and has a stable structure.

[0031] It should be noted that the PTC temperature sensor of the present invention is used for but not limited to the field of temperature sensor technology. For the convenience of explanation, in the present invention, only the application of the PTC temperature sensor in the field of temperature sensor technology is used as an example for explanation. The principles of applying the PTC temperature sensor to other types of equipment are essentially the same as those applied to the field of temperature sensor technology, and will not be described in detail here.

[0032] See also Figures 1 to 6 , Figure 1A PTC temperature sensor is provided in one embodiment of the present invention, which is connected to a sensor mounting part 1 and is used to detect the coolant temperature. The sensor mounting part 1 is provided with a coolant cavity 11 and a detection hole 12 connected to the coolant cavity 11, and includes: a detection component 2, at least one sealing component 3 and a connecting component 4. The detection component 2 includes a pin seat 21 and a thermistor 22. The thermistor 22 is arranged relative to the detection hole 12 and can be inserted into the detection hole 12. The pin seat 21 is connected to the thermistor 22. The sealing component 3 is arranged between the thermistor 22 and the circumferential inner wall of the detection hole 12, and is used to seal the thermistor 22 and the circumferential inner wall of the detection hole 12. The connecting component 4 is connected to the pin seat 21 and is detachably connected to the sensor mounting part 1, so that the pin seat 21 and the thermistor 22 can be detachably connected to the sensor mounting part 1.

[0033] In this device, the thermistor 22 is arranged relative to the detection hole 12 of the sensor mounting part 1 and is connected to the pin seat 21. The thermistor 22 can be inserted into the detection hole 12 to detect the temperature in the cooling liquid chamber 11. At least one seal 3 is provided between the thermistor 22 and the circumferential inner wall of the detection hole 12, and the seal 3 can seal the thermistor 22 and the circumferential inner wall of the detection hole 12. The connecting component 4 is connected to the pin seat 21 and is detachably connected to the sensor mounting part 1, so that the pin seat 21 and the thermistor 22 can be detachably connected to the sensor mounting part 1.

[0034] Compared with the prior art, the sealing performance is improved by providing at least one seal 3 between the thermistor 22 and the circumferential inner wall of the detection hole 12, which can be sealed and connected to the circumferential inner wall of the thermistor 22 and the detection hole 12. At the same time, the connecting component 4 is used to realize the detachable connection between the pin holder 21, the thermistor 22 and the sensor mounting member 1, instead of using the external thread on the outer wall of the fastener to form a threaded connection with the internal threaded hole on the mounting member. It is easy to operate and has a stable structure, and can solve the technical problem in the prior art that the external thread on the outer wall of the fastener and the internal threaded hole on the mounting member form a threaded connection, resulting in poor sealing between the outer wall of the fastener and the wall of the internal threaded hole on the mounting member.

[0035] Furthermore, the electric vehicle PTC water heater is electrically driven, with a PTC element as its core heating element. It heats the antifreeze and delivers warm air into the vehicle via the evaporator. This warm air is not only soft and comfortable, but also temperature-stable, safe and reliable, and energy-efficient. The antifreeze is contained within the refrigerant chamber, and its stability is monitored by a thermistor 22. This is a conventional setup well known to those skilled in the art and will not be elaborated upon here.

[0036] In this embodiment, Figures 1 to 3As shown, the pin holder 21 has two pins, which are arranged along the height direction of the pin holder 21, and one end of the pin is embedded in the pin holder 21, and the other end is placed outside the top of the pin holder 21 for electrical connection with external equipment. The thermistor 22 has two electrical connection ends, which are arranged in a one-to-one correspondence with the pins and are electrically connected to one end of the pins.

[0037] The electrical connection between the thermistor 22 and the external device is achieved through the pins, which reduces the problems caused by wiring and leads. Specifically, the pins and the two electrical connection ends of the thermistor 22 are connected by soldering.

[0038] Furthermore, the pin socket 21 here is a common and easily purchased device on the market. It is a conventional setting well known to those skilled in the art and will not be described in detail here.

[0039] like Figure 2 、 Figure 3 As shown, the detection assembly 2 further includes a detection shell 23 , thermal grease 24 , a first sealing ring 25 , and a heat shrink sleeve 26 .

[0040] In one embodiment, see Figure 3 The detection shell 23 covers the thermistor 22 and is connected to the pin seat 21 , and the thermal grease 24 is filled between the detection shell 23 and the thermistor 22 .

[0041] By providing a detection shell 23 and a heat shrink sleeve 26 to insulate and protect the pins of the thermistor 22, the safety of the device is improved. At the same time, the thermal conductive silicone grease 24 is filled with the thermistor 22 to improve the rapid response of the thermistor, so that the sensor can quickly and accurately measure and transmit temperature signals, ensuring the stable operation of the device.

[0042] Furthermore, the purpose of the thermal grease 24 here is to enhance heat conduction and increase the response speed of the thermistor. The thermal grease 24 is a common and easy-to-purchase device or product on the market. This is a conventional setting known to those skilled in the art and will not be described in detail here.

[0043] In one embodiment, the detection shell 23 and the pin holder 21 are connected by riveting.

[0044] The riveting connection method not only facilitates production but also saves production costs.

[0045] Specifically, such as Figures 3 to 5 As shown, the detection shell 23 is provided with an opening connected to its interior, and the pin holder 21 is formed with a connecting portion relative to the opening, and the connecting portion has a large diameter section and a small diameter section. The large diameter section of the connecting portion is arranged relative to the small diameter section close to the thermistor 22, and the connecting portion is inserted into the opening, and the open end of the detection shell 23 covers the large diameter section of the connecting portion.

[0046] By wrapping the large diameter section of the connection portion with the open end of the detection shell 23 , the stability of the connection can be improved.

[0047] In one embodiment, Figure 3 As shown, the first sealing ring 25 is provided at the connection between the detection shell 23 cover and the pin seat 21 and is built into the detection shell 23 .

[0048] The first sealing ring 25 is used to enhance the sealing performance of the connection between the pin holder 21 and the detection housing 23 .

[0049] Furthermore, the first sealing ring 25 is an elastic sealing ring that is common and easy to purchase on the market. This is a conventional setting well known to those skilled in the art and will not be described in detail here.

[0050] In one embodiment, Figure 3 As shown, the heat shrink sleeve 26 is placed on the connection between one end of the pin and the connection end of the thermistor 22 and is embedded in the thermal grease 24 .

[0051] The heat shrink sleeve 26 is mounted on the welding points between the two pins and the two electrical connection ends of the thermistor 22 to improve insulation and enhance protection of the welding points.

[0052] Furthermore, the heat shrink sleeve 26 here is a common and easily purchased device on the market. It is a conventional setting well known to those skilled in the art and will not be described in detail here.

[0053] In one embodiment, Figures 3 to 5 As shown, at least one sealing groove 231 is formed on the circumferential outer wall of the detection shell 23 . The sealing member 3 is an elastic sealing ring. The elastic sealing ring is sealed on the inner wall of the sealing groove 231 and abuts against the circumferential inner wall of the detection hole 12 .

[0054] The elastic sealing ring is sleeved in the sealing groove 231 to achieve a sealed connection with the detection shell 23 , and at the same time, the elastic sealing ring achieves a sealed connection with the circumferential inner wall of the detection hole 12 by abutting.

[0055] Furthermore, the elastic sealing ring here is a common and easily purchased device on the market. It is a conventional setting well known to those skilled in the art and will not be described in detail here.

[0056] In one embodiment, Figure 4 、 Figure 5 As shown, there are two sealing grooves 231 on the detection shell 23 . The two sealing grooves 231 are spaced apart along the length direction of the detection shell 23 , and the sealing members 3 are disposed in a one-to-one correspondence with the sealing grooves 231 .

[0057] The sealing performance can be improved by using two elastic sealing rings arranged at intervals.

[0058] In this embodiment, Figure 6 As shown, the sensor mounting part 1 is provided with at least one first connecting hole, the inner wall of the first connecting hole is formed with an internal thread, the circumferential side wall of the pin seat 21 is formed with a frame 41, and the frame 41 is provided with a second connecting hole relative to the first connecting hole. The connecting component 4 also includes at least one fastening connection part 42, and the fastening connection part 42 is arranged in a one-to-one correspondence with the second connecting hole. The threaded section of the fastening connection part 42 passes through the second connecting hole and is threadedly connected to the first connecting hole, and the large diameter section of the fastening connection part 42 abuts against the frame 41.

[0059] The threaded connection between the fastening connection portion 42 and the first and second connection holes can replace the direct threaded connection between the fastener and the sensor mounting member 1, which is not only convenient to operate but also effectively protects the sensor from damage caused by rotating the fastener.

[0060] Furthermore, the fastening connection part 42 here is a screw or nut that is common and easy to purchase on the market. This is a conventional setting known to those skilled in the art and will not be described in detail here.

[0061] In order to better understand the present invention, the following Figures 1 to 6 The technical solution of the utility model is described in detail:

[0062] The thermistor 22 is arranged relative to the detection hole 12 of the sensor mounting part 1 and is connected to the pin seat 21. The thermistor 22 can be inserted into the detection hole 12 to detect the temperature in the cooling liquid chamber 11. At least one seal 3 is provided between the thermistor 22 and the circumferential inner wall of the detection hole 12, and the seal 3 can seal the thermistor 22 and the circumferential inner wall of the detection hole 12. The connecting component 4 is connected to the pin seat 21 and is detachably connected to the sensor mounting part 1, so that the pin seat 21 and the thermistor 22 can be detachably connected to the sensor mounting part 1. Compared with the existing technology, the sealing performance is improved by providing at least one seal 3 between the thermistor 22 and the circumferential inner wall of the detection hole 12, which can be sealed and connected to the circumferential inner wall of the thermistor 22 and the detection hole 12. At the same time, the connecting component 4 is used to realize the detachable connection between the pin seat 21, the thermistor 22 and the sensor mounting member 1, instead of using the external thread on the outer wall of the fastener to form a threaded connection with the internal threaded hole on the mounting member, which is convenient to operate and has a stable structure.

[0063] The specific working process of the present invention is as follows: first, the two electrical connection ends of the pin on the pin holder 21 and the thermistor 22 are connected by soldering, and then the heat shrink tube is put on the welding part of the thermistor 22 and the pin on the pin holder 21, and then the welding part of the thermistor 22 and the pin is wrapped by high-temperature heat shrinkage and heat shrinkage molding; then the thermal grease 24 is first injected into the detection shell 23, and then the first inner sealing ring 25 is installed, and then the welding assembly of the pin holder 21 and the thermistor 22 is riveted and assembled; then after riveting, the open end of the detection shell 23 is wrapped around the connection part of the pin holder 21, and the two sealing members 3 are installed after riveting and molding, that is, the PTC temperature sensor assembly is formed; finally, the PTC temperature sensor is inserted into the detection hole 12, and the two sealing members 3 are respectively abutted against the inner wall of the detection hole 12, and then the threaded section of the fastening connection part 42 is passed through the first connection hole and threadedly connected with the second connection hole.

[0064] The device, through the above structure, can solve the technical problem in the prior art that the external thread on the outer wall of the fastener forms a threaded connection with the internal threaded hole on the mounting piece, resulting in poor sealing between the outer wall of the fastener and the wall of the internal threaded hole on the mounting piece.

[0065] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A PTC temperature sensor connected to a sensor mounting member for detecting coolant temperature, wherein the sensor mounting member is provided with a coolant cavity and a detection hole communicating with the coolant cavity, characterized in that: include: A detection assembly, comprising a pin socket and a thermistor, wherein the thermistor is arranged relative to the detection hole and can be inserted into the detection hole, and the pin socket is connected to the thermistor; at least one sealing member, the sealing member being disposed between the thermistor and the circumferential inner wall of the detection hole, and being used for sealing the thermistor and the circumferential inner wall of the detection hole; and A connecting assembly is connected to the pin seat and is detachably connected to the sensor mounting piece, and is used to enable the pin seat and the thermistor to be detachably connected to the sensor mounting piece.

2. The PTC temperature sensor according to claim 1, characterized in that: The pin socket has two pins, which are arranged along the height direction of the pin socket, and one end of the pin is embedded in the pin socket and the other end is placed outside the top of the pin socket for electrical connection with external equipment. The thermistor has two electrical connection ends, which are arranged one-to-one with the pins and are electrically connected to one end of the pins.

3. The PTC temperature sensor according to claim 2, characterized in that: The detection assembly further comprises a detection shell and thermal conductive silicone grease. The detection shell covers the thermistor and is connected to the pin seat. The thermal conductive silicone grease is filled between the detection shell and the thermistor.

4. The PTC temperature sensor according to claim 3, characterized in that: The detection shell cover and the pin seat are connected by riveting.

5. The PTC temperature sensor according to claim 4, characterized in that: The detection shell is provided with an opening communicating with its interior, the pin holder is formed with a connecting portion relative to the opening, and the connecting portion has a large diameter section and a small diameter section, the large diameter section of the connecting portion is arranged closer to the thermistor relative to the small diameter section, the connecting portion is inserted into the opening, and the open end of the detection shell covers the large diameter section of the connecting portion.

6. The PTC temperature sensor according to claim 5, characterized in that: The detection assembly further includes a first sealing ring, which is arranged at the connection between the detection shell cover and the pin seat and is built into the detection shell.

7. The PTC temperature sensor according to claim 6, characterized in that: The detection component also includes a heat shrink sleeve, which is placed at the connection between one end of the pin and the connection end of the thermistor and is built into the thermal grease.

8. The PTC temperature sensor according to claim 7, characterized in that: The circumferential outer wall of the detection shell is provided with at least one sealing groove. The sealing member is an elastic sealing ring. The elastic sealing ring sealing sleeve is provided on the inner wall of the sealing groove and abuts against the circumferential inner wall of the detection hole.

9. The PTC temperature sensor according to claim 8, characterized in that: There are two sealing grooves on the detection shell, and the two sealing grooves are arranged at intervals along the length direction of the detection shell, and the sealing members are arranged in a one-to-one correspondence with the sealing grooves.

10. The PTC temperature sensor according to claim 9, characterized in that: The sensor mounting component is provided with at least one first connecting hole, the inner wall of the first connecting hole is formed with an internal thread, the circumferential side wall of the pin seat is formed with a frame, and the frame is provided with a second connecting hole relative to the first connecting hole. The connecting assembly also includes at least one fastening connection part, and the fastening connection part is arranged in a one-to-one correspondence with the second connecting hole. The threaded section of the fastening connection part passes through the second connecting hole and is threadedly connected to the first connecting hole, and the large diameter section of the fastening connection part abuts against the frame.

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