A pressure and temperature sensor for oil

Abstract

The present invention relates to the field of sensor technology, specifically a pressure and temperature sensor for oil, comprising a ceramic pressure module equipped with a signal processing chip. The ceramic pressure module is connected to upper pins, some of which are connected to lower pins via springs, and the lower pins are connected to a thermistor. The thermistor, the lower pins, and some of the springs are encapsulated by an NTC base. The upper pins and some of the springs are sheathed by a connector. The NTC base can interlock with the connector to form a cavity that can position the ceramic pressure module. Parts of the NTC base can be sheathed with some of the connectors by a housing for protection. This device has a simple and reliable structure and production process, is easy to assemble, and does not affect electronic components. This solves the problem of complex assembly processes and high requirements for assembly equipment for such sensors.

Description

Technical Field

[0001] The present invention relates to the technical field of sensors, and in particular to a pressure and temperature sensor for oil. Background Art

[0002] A pressure sensor is a device or apparatus that can sense pressure signals and convert them into usable output electrical signals according to certain rules. It is usually composed of a pressure sensitive element and a signal processing unit. According to different test pressure types, pressure sensors can be divided into gauge pressure sensors, differential pressure sensors, and absolute pressure sensors. Among them, in the automotive field, oil pressure detection is particularly important. At present, most of the same type of sensors on the market require multiple welding processes and have complex structures. They have high requirements for assembly technology. The welding points are close to electronic components, which can easily cause hidden damage to electronic components. Due to frequent contact with oil, the oil will penetrate into the interior of the sensor over time, posing a safety hazard for long-term use in the future.

[0003] Therefore, a technology is urgently needed to solve this problem. Summary of the Invention

[0004] The purpose of the present invention is to overcome the problems of the above-mentioned prior art and provide a pressure and temperature sensor for oil, which can achieve rapid assembly of the product by only using snap fasteners and gluing. In addition, the internal structure mostly uses elastic contact to avoid welding connections, which not only does not cause invisible damage to the product, but the elastic structure also makes the product more pressure-resistant, which not only does not affect the detection accuracy, but also can effectively improve the service life.

[0005] The above objectives are achieved through the following technical solutions:

[0006] A pressure and temperature sensor for oil, comprising a ceramic pressure module equipped with a signal processing chip, wherein upper pins are connected to the ceramic pressure module, some of the upper pins are connected to lower pins via springs, and the lower pins are connected to a thermistor;

[0007] The thermistor, the lower pin and part of the spring are packaged by an NTC base;

[0008] The upper pin and part of the spring are sleeved by a connector;

[0009] The NTC base and the connector can be snapped together to form a cavity for positioning the ceramic pressure module;

[0010] Part of the NTC base and part of the connector can be protected by a housing.

[0011] Furthermore, the NTC base is T-shaped, the thermistor is built into the head end of the NTC base, a mounting groove for mounting the pressure module is provided at the end of the NTC base, and the lower pin is built into the body of the NTC base; a spring mounting hole for the end portion of the lower pin to pass through is provided on the outer wall of the mounting groove, the spring is partially embedded in the spring mounting hole, and the other end of the spring is connected to part of the upper pin, so that the upper pin and the lower pin form an elastic connection.

[0012] Furthermore, an NTC bracket is also included, which is built into the NTC base and can be used to cover and fix the body of the lower pin.

[0013] Furthermore, an oil pressure cavity is opened along the bottom side of the mounting groove, and the oil pressure cavity can conflict with the bottom side of the ceramic pressure module to form an enclosed space for storing oil; at least one through hole for oil to pass through is opened along the bottom side of the oil pressure cavity.

[0014] Furthermore, a first sealing ring is provided along the bottom side of the oil pressure cavity, and a top portion of the first sealing ring contacts the bottom side of the ceramic pressure module.

[0015] Furthermore, the inner cavity of the shell matches the shape of the NTC base and can form a channel for oil flow with the outer wall of the NTC base, and the channel is connected to the through hole; a second sealing ring is provided between the end of the channel and the outer wall of the NTC base.

[0016] Furthermore, the upper pin is connected to the ceramic pressure module via an S-shaped spring sheet.

[0017] Furthermore, the NTC base is provided with a spring pin through-slot for a spring pin connected to the ceramic pressure module to pass through. The spring pin passes through the spring pin through-slot to achieve connection with the housing.

[0018] Furthermore, mutually symmetrical buckles are provided along the outer walls on both sides of the NTC base. Correspondingly, a group of slots matching the buckles are provided on the connector, and the buckles and the slots can be engaged with each other.

[0019] Furthermore, the outer shape of the shell is similar to that of the NTC base, and the shell is partially sleeved with the NTC base and can be connected to the outer wall of the connector through a sealant after a part of the connector is connected.

[0020] Beneficial effects

[0021] The oil pressure and temperature sensor provided by this invention features a design that utilizes multiple elastic contacts to avoid soldered connections, effectively preventing potential damage to electronic components during welding. Furthermore, the device's structure is replaced by simple mechanical assembly, significantly reducing high-temperature processes during production, effectively improving product qualification rates and the durability of product quality. Finally, this device reduces process equipment investment costs, reduces reliance on advanced equipment, and improves first-pass qualification rates, significantly enhancing product market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A perspective view of a pressure and temperature sensor for oil according to the present invention;

[0023] Figure 2 This is a schematic diagram of the connection between the NTC base and connector of a pressure and temperature sensor for oil according to the present invention;

[0024] Figure 3 This is a cross-sectional view from a first perspective of a pressure and temperature sensor for oil according to the present invention;

[0025] Figure 4 A cross-sectional view from a second perspective of a pressure and temperature sensor for oil according to the present invention;

[0026] Figure 5 This is a schematic diagram of the internal structure of a pressure and temperature sensor for oil according to the present invention;

[0027] Figure 6 This is a schematic structural diagram of an NTC base for an oil pressure and temperature sensor according to the present invention.

[0028] Graphic mark:

[0029] 1-Ceramic pressure module, 2-Signal processing chip, 3-Upper pin, 4-Spring, 5-Lower pin, 6-Thermistor, 7-NTC base, 8-Connector, 9-Housing, 10-NTC bracket, 11-Channel, 12-Second sealing ring, 13-S-shaped spring sheet, 14-Third sealing ring, 15-Sealing glue, 16-Mounting groove, 17-Spring mounting hole, 18-Oil pressure cavity groove, 19-Through hole, 20-First sealing ring, 21-Spring pin through groove, 22-Spring pin, 23-Snap buckle, 24-Guide groove, 25-Card slot. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and examples. The described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort shall fall within the scope of protection of the present invention.

[0031] like Figure 1-4 As shown, a pressure and temperature sensor for oil, a pressure and temperature sensor for oil, comprising a ceramic pressure module 1 equipped with a signal processing chip 2, the ceramic pressure module 1 is connected to an upper pin 3, part of the upper pin 3 is connected to the lower pin 5 through a spring 4 (i.e., one end of the spring 4 is connected to one end of the upper pin 3, and the other end of the spring 4 can be connected to the lower pin 5), and the lower pin 5 is connected to a thermistor 6 (i.e., one end of the lower pin 5 is connected to the spring 4, and the other end is connected to the thermistor 6);

[0032] The thermistor 6, the lower pin 5 and part of the spring 4 are encapsulated by the NTC base 7;

[0033] The upper pin 3 and part of the spring 4 are sleeved by a connector 8;

[0034] The NTC base 7 and the connector 8 can be snapped together to form a cavity that can position the ceramic pressure module 1;

[0035] Part of the NTC base 7 and part of the connector 8 can be sheathed together by the housing 9 to form protection.

[0036] Example 1

[0037] like Figure 4 and 6 As shown, as an optimization of the NTC base 7 in the oil pressure and temperature sensor described in the present invention, the NTC base 7 is T-shaped, with the thermistor 6 built into the head end of the NTC base 7, a mounting groove 16 for mounting the pressure module 1 is provided at the end of the NTC base 7, and the lower pin 5 is built into the body of the NTC base 7. The outer wall of the mounting groove 16 is provided with a spring mounting hole 17 for the end portion of the lower pin 5 to pass through. The spring 4 is partially embedded in the spring mounting hole 17, and the other end of the spring 4 is connected to a portion of the upper pin 3, so that the upper pin 3 and the lower pin 5 form an elastic connection. The upper pin 3 and the ceramic pressure module 1 are connected via an S-shaped spring piece 13 welded to the pad of the ceramic pressure module 1, forming an elastic contact. The S-shaped spring piece 13 connects the signal of the ceramic pressure module 1 to the upper pin 3 through elastic contact, avoiding welding and simplifying the assembly process. Because there is no welding heat, the impact of the assembly process on product performance is minimized.

[0038] Specifically, in this embodiment, the NTC base 7 is a solid T-shaped column, and the main body of the thermistor 6 and the lower pin 5 are injection-molded into one piece by the NTC base 7. There are two lower pins 5 that are symmetrically arranged with each other, one end of which is connected to the thermistor 6, and the other end is exposed in the spring mounting hole 17. When the spring 4 is inserted into the spring mounting hole 17, the bottom end of the spring 4 is connected to the lower pin 5.

[0039] The depth of the spring mounting hole 17 is not less than 1 / 2 of the length of the spring 4 and not greater than the length of the spring 4 .

[0040] As a further optimization of this embodiment, an NTC bracket 10 is also included. The NTC bracket 10 is built into the NTC base 7 and can be mounted on and fixed to the body of the lower pin 5.

[0041] Specifically, the NTC bracket 10 can serve as the skeleton of the NTC base 7 , which can not only be used to install the lower pins 5 , but also facilitate the injection molding of the NTC base 7 .

[0042] In addition, in this embodiment, the NTC base 7 is made of plastic and adopts a secondary injection molding process to completely cover the thermistor 6, so that even if it is immersed in pressurized oil, no oil will penetrate into the thermistor 6. It can not only sense the oil temperature in real time, but also prevent the oil from penetrating into the interior of the sensor.

[0043] Example 2

[0044] like Figure 4 As shown, as an optimization of the oil pressure detection channel in the oil pressure and temperature sensor according to the present invention, an oil pressure cavity 18 is defined along the bottom side of the mounting groove 16. The oil pressure cavity 18 can contact the bottom side of the ceramic pressure module 1 to form a sealed space for storing oil. At least one through hole 19 is defined along the bottom side of the oil pressure cavity 18 for oil to pass through.

[0045] Preferably, a first sealing ring 20 is provided along the bottom side of the oil pressure cavity 18, with the top of the first sealing ring 20 contacting the bottom side of the ceramic pressure module 1. This structure ensures that the oil pressure entering the oil pressure cavity 18 is always concentrated on the bottom side of the ceramic pressure module 1, effectively preventing oil from overflowing, and facilitating the ceramic pressure module 1 to detect the oil pressure it is receiving.

[0046] The inner cavity of the housing 9 matches the outer shape of the NTC base 7 and can form a channel 11 for oil flow with the outer wall of the NTC base 7. The channel 11 is connected to the through hole 19.

[0047] In order to prevent the oil from continuing to overflow along the gap between the housing 9 and the outer wall of the NTC base 7 , a second sealing ring 12 is provided between the end of the channel 11 and the outer wall of the NTC base 7 .

[0048] Example 3

[0049] like Figure 2 and 6 As shown, the NTC base 7 is further provided with a spring pin slot 21 for a spring pin 22 connected to the ceramic pressure module 1 to pass through. After the spring pin 22 passes through the spring pin slot 21, it is connected to the housing 9 (because the housing 9 is ultimately connected to the NTC base, the contact between the spring pin 22 and the housing 9 is equivalent to the final connection).

[0050] Specifically, the spring pin 22 can realize the electrical connection between the ceramic pressure module 1 and the housing 9, thereby achieving good grounding of the internal circuit with the ground of the automobile frame, preventing EMC interference in future work, avoiding various safety accidents caused by EMC, and greatly improving product reliability.

[0051] Example 4

[0052] like Figure 1-3 As shown, as an optimization of the connection method of the NTC base 7, the connector 8 and the housing 9 in the pressure and temperature sensor for oil according to the present invention, left-right symmetrical buckles 23 are provided along the outer walls of both sides of the NTC base 7. Correspondingly, a group of card slots 25 matching the card slots 23 are provided on the connector 8, and the card slots 25 can be engaged with each other.

[0053] As an optimization of this structure, left-right symmetrical guide grooves 24 are provided along the outer walls on both sides of the NTC base 7. The buckle 23 is provided at the axial position of the guide groove 24. The guide groove 24 can quickly guide the slot 25 to the position of the buckle 23, thereby realizing rapid connection between the buckle 23 and the slot 25.

[0054] The outer shape of the shell 9 is similar to that of the NTC base 7. The shell 9 is partially covered with the NTC base 7 and can be fixed to the outer wall of the connector 8 through a sealant 15 after being partially covered with the connector 8. A third sealing ring 14 for forming a seal and connecting to the oil tank or the like is also provided on the outer wall of the head of the shell 9.

[0055] The above description is only for explaining the embodiments of the present invention and is not intended to limit the present invention. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pressure and temperature sensor for oil, characterized in that: A ceramic pressure module is provided with a signal processing chip, wherein upper pins are connected to the ceramic pressure module, some of the upper pins are connected to lower pins via springs, and the lower pins are connected to thermistors; The thermistor, the lower pin and part of the spring are packaged by an NTC base; The upper pin and part of the spring are sleeved by a connector; The NTC base and the connector can be snapped together to form a cavity for positioning the ceramic pressure module; Part of the NTC base and part of the connector can be protected by a housing; The NTC base is T-shaped, with the thermistor built into the head end of the NTC base, a mounting groove for mounting the pressure module is provided at the end of the NTC base, and the lower pin is built into the body of the NTC base; a spring mounting hole is provided on the outer wall of the mounting groove for the end portion of the lower pin to pass through, the spring is partially embedded in the spring mounting hole, and the other end of the spring is connected to part of the upper pin, so that the upper pin and the lower pin are elastically connected; the NTC base is a solid T-shaped column, and the body of the thermistor and the lower pin are both injection-molded into one body by the NTC base; wherein, there are two lower pins symmetrically arranged with each other, one end of which is connected to the thermistor and the other end is exposed in the spring mounting hole. When the spring is inserted into the spring mounting hole, the bottom end of the spring is connected to the lower pin; It also includes an NTC bracket, which is built into the NTC base and can be used to cover and fix the body of the lower pin; the NTC base is made of plastic and adopts a secondary injection molding process to achieve complete coverage of the thermistor; The upper pin is connected to the ceramic pressure module via an S-shaped spring sheet; Along the outer walls of both sides of the NTC base, there are symmetrical buckles and guide grooves. The buckles are set at the axis of the guide grooves. Correspondingly, a group of slots matching the buckles are set on the connector. The buckles and the slots can be mutually engaged. The NTC base is also provided with a spring pin through-slot for a spring pin connected to the ceramic pressure module to pass through. The spring pin is connected to the housing after passing through the spring pin through-slot.

2. A pressure and temperature sensor for oil according to claim 1, characterized in that: An oil pressure cavity is provided along the bottom side of the mounting groove, and the oil pressure cavity can collide with the bottom side of the ceramic pressure module to form an enclosed space for storing oil; at least one through hole for oil to pass through is provided along the bottom side of the oil pressure cavity.

3. The pressure and temperature sensor for oil according to claim 2, characterized in that: A first sealing ring is provided along the bottom side of the oil pressure cavity, and the top of the first sealing ring contacts the bottom side of the ceramic pressure module.

4. The pressure and temperature sensor for oil according to claim 2, characterized in that: The inner cavity of the shell matches the shape of the NTC base and can form a channel for oil flow with the outer wall of the NTC base. The channel is connected to the through hole; a second sealing ring is provided between the end of the channel and the outer wall of the NTC base.

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