A pressure and temperature integrated sensor for new energy vehicles

Abstract

The present invention discloses a pressure-temperature integrated sensor for new energy vehicles, including a sensor housing, an electrical connector, a sensitive element seat, a PCB circuit board, a pressure sensitive element, and a temperature sensitive element. The lower end of the sensor housing is integrally formed with a threaded pipe joint, and the sensitive element seat is installed in the inner cavity of the sensor housing. The upper end surface of the sensitive element seat is provided with a square cavity, two groups of symmetrically arranged support protrusions and two groups of symmetrically arranged buckles. The pressure sensitive element is installed in the square cavity, and the lower end of the sensitive element seat is provided with a boss, and the boss is provided with a support extending downward and extending from the lower end of the threaded pipe joint. The lower end of the support is provided with a blind hole, and the temperature sensitive element is installed in the blind hole; the lower end of the electrical connector is placed inside the sensor housing, and four PIN pins are vertically inserted on the internal end surface of the electrical connector, and the PCB circuit board is plugged into two groups of symmetrically opened U-shaped grooves on the outer side wall of the lower end of the electrical connector. The present invention can detect the pressure and temperature of liquid or gas, and has strong structural stability.

Description

Technical Field

[0001] The invention relates to sensor technology, in particular to a pressure-temperature integrated sensor for new energy vehicles. Background Art

[0002] The temperature and pressure integrated sensor is mainly used to collect the pressure and temperature of the liquid or gas in the inner cavity or pipeline. With the vigorous development of new energy vehicles, new requirements have been put forward for the automotive thermal management system. In addition to riding comfort, battery temperature control has also become one of the key technologies. The application of heat pump technology in new energy vehicles has become a trend. Therefore, it is necessary to detect the refrigerant pressure and temperature of the automotive thermal management system in order to accurately control the temperature of the battery and passenger compartment, and further reduce energy consumption and increase the cruising range. Therefore, it is necessary to use a pressure and temperature integrated sensor to replace the traditional pressure sensor on new energy machines. This patent develops a sensor that integrates a pressure and temperature integrated sensor for new energy vehicles and a temperature sensor based on NTC, replacing the traditional single pressure sensor, realizing real-time and accurate acquisition of temperature and pressure, and combining control strategies to achieve accurate control of the temperature of new energy vehicles and improve the cruising range of new energy vehicles. Summary of the invention

[0003] The purpose of the present invention is to provide a pressure-temperature integrated sensor for new energy vehicles to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A pressure-temperature integrated sensor for new energy vehicles, comprising a sensor housing, an electrical connector, a sensitive element seat, a PCB circuit board, a pressure sensitive element, and a temperature sensitive element. The lower end of the sensor housing is integrally formed with a threaded pipe joint, the sensitive element seat is installed in the inner cavity of the sensor housing, the upper end surface of the sensitive element seat is provided with a square cavity, two groups of symmetrically arranged support protrusions and two groups of symmetrically arranged buckles, the pressure sensitive element is installed in the square cavity, a boss is provided at the lower end of the sensitive element seat, a support extending downward and extending from the lower end of the threaded pipe joint is provided on the boss, a blind hole is provided at the lower end of the support, the temperature sensitive element is installed in the blind hole, a fluid channel is vertically provided inside the boss, the upper opening of the fluid channel is communicated with the square cavity, the lower opening of the fluid channel is located on the lower end surface of the boss and communicates with the gap between the support and the inner wall of the threaded pipe joint, and a groove identical to the blind hole is also vertically provided on the integral structure composed of the boss and the support;

[0006] The lower end of the electrical connector is placed inside the sensor housing, and four PIN pins are vertically inserted on the internal end surface of the electrical connector. The PCB circuit board is inserted into two groups of symmetrically opened U-shaped grooves on the outer wall of the lower end of the electrical connector, and the PCB circuit board is provided with four groups of connection holes respectively connected to the lower ends of the four PIN pins. A positioning protrusion for abutting the upper end surface of the PCB circuit board is also provided on the internal end surface of the electrical connector, and the lower end surface of the PCB circuit board abuts against the top surface of the supporting protrusion. Two groups of symmetrically opened grooves are also provided on the outer wall of the lower end of the electrical connector, and the two groups of grooves are respectively engaged with the two groups of buckles. The PCB circuit board is connected to the pressure sensitive element by soldering through four groups of pressure pins, and the PCB circuit board is connected to the temperature sensitive element by soldering through the sensitive element seat and the temperature pins in the slots and blind holes on the boss in turn, and the slot cavity is filled with adhesive.

[0007] Furthermore, a plug hole matching with the upper end of the PIN pin is provided on the inner end surface of the electrical connector, and the upper end of the PIN pin and the plug hole are connected by interference fit.

[0008] Furthermore, the lower end of the PIN pin is connected to the connecting hole by interference fit.

[0009] Furthermore, the pressure sensitive element is bonded in the square cavity by an adhesive and covers the upper opening of the fluid channel.

[0010] Furthermore, the upper end of the sensor housing is shrunk by a shrunk machine.

[0011] Furthermore, the gap between the necked portion of the upper end of the sensor housing and the outer wall of the electrical connector is filled with sealant.

[0012] Furthermore, a first sealing ring is sleeved on the outer periphery of the boss at the lower end of the sensitive element seat.

[0013] Furthermore, a second sealing ring is sleeved outside the threaded pipe joint at the lower end of the sensor housing.

[0014] Furthermore, the pressure sensitive element and the temperature sensitive element are both made of ceramic resistors.

[0015] Furthermore, the PCB circuit board is provided with positioning circular holes which are matched and connected with the four groups of pressure pins.

[0016] The beneficial effects of the present invention are:

[0017] The present invention provides a pressure-temperature integrated sensor for new energy vehicles, which integrates a temperature sensitive element and a pressure sensitive element. One sensor can detect the pressure and temperature of a liquid or gas at the same time, replacing the functions of a traditional pressure sensor and a temperature sensor, improving the compactness of the sensor, and bringing great convenience to customers' applications. By adopting a pressure sensitive element made of a ceramic resistor, the detection accuracy of the sensor is improved, the influence of temperature on the accuracy is reduced, and the operating temperature range is expanded, so that normal operation within the range of -40°C to 150°C can be achieved. The full temperature range and full-scale accuracy can be improved to 2% VDD, reducing temperature drift, and ensuring detection accuracy in both high and low temperature ranges. Through the structural design of the present application, quality stability and working reliability are improved; the PCB circuit board and the pressure sensitive element are independently manufactured and connected by pin soldering, replacing the traditional integrated manufacturing of the circuit board and the sensitive element, reducing processing difficulty and manufacturing cost, and improving quality stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] Figure 1 It is a split diagram of the present invention.

[0020] Figure 2 It is a cross-sectional view of the present invention.

[0021] Figure 3 It is a three-dimensional view of the electrical connector of the present invention.

[0022] Figure 4 It is a structural diagram of the sensitive element seat of the present invention.

[0023] Figure 5 It is a structural diagram of the pressure sensitive element of the present invention.

[0024] Figure 6 It is a top view of the structure of the PCB circuit board of the present invention.

[0025] In the figure: 1. sensor housing, 2. electrical connector, 3. sensitive element seat, 4. PCB circuit board, 5. pressure sensitive element, 6. temperature sensitive element, 7. threaded pipe joint, 8. supporting protrusion, 9. buckle, 10. boss, 11. support, 12. fluid channel, 13. PIN needle, 14. U-shaped groove, 15. connecting hole, 16. positioning protrusion, 17. groove, 18. pressure pin, 19. temperature pin, 20. plug-in hole, 21. sealant, 22. first sealing ring, 23. second sealing ring, 24. positioning circular hole. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figure 1-6 As shown, the present invention provides a pressure-temperature integrated sensor for new energy vehicles, including a sensor housing 1, an electrical connector 2, a sensitive element seat 3, a PCB circuit board 4, a pressure sensitive element 5, and a temperature sensitive element 6. The lower end of the sensor housing 1 is integrally formed with a threaded pipe joint 7, and the sensitive element seat 3 is installed in the inner cavity of the sensor housing 1. The upper end surface of the sensitive element seat 3 is provided with a square cavity, two groups of symmetrically arranged supporting protrusions 8 and two groups of symmetrically arranged buckles 9, and the pressure sensitive element 5 is installed in the square cavity. A boss 10 is provided at the lower end of the sensitive element seat 3, and a support 11 extending downward and extending from the lower end of the threaded pipe joint 7 is provided on the boss 10. A blind hole is provided at the lower end of the support 11, and the temperature sensitive element 6 is installed in the blind hole. A fluid channel 12 is vertically provided inside the boss 10, and the upper end of the fluid channel 12 is communicated with the square cavity, and the lower end of the fluid channel 12 is located on the lower end surface of the boss 10 and communicates with the gap between the support 11 and the inner wall of the threaded pipe joint 7. The overall structure composed of the boss 10 and the support 11 is also vertically provided with a groove that is the same as the blind hole;

[0028] The lower end of the electrical connector 2 is placed inside the sensor housing 1. Four PIN pins 13 are vertically inserted on the inner end surface of the electrical connector 2. The four PIN pins 13 are used for pressure output, temperature output, grounding, and power connection. The PCB circuit board 4 is inserted into two groups of symmetrical U-shaped grooves 14 on the outer wall of the lower end of the electrical connector 2. The PCB circuit board 4 is provided with four groups of U-shaped grooves 14 that are connected to the four PIN pins 13. The lower end of the N pin 13 is connected to a connecting hole 15, and a positioning protrusion 16 for abutting against the upper end surface of the PCB circuit board 4 is also provided on the inner end surface of the electrical connector 2. The lower end surface of the PCB circuit board 4 abuts against the top surface of the supporting protrusion 8. Two groups of symmetrical grooves 17 are also provided on the outer wall of the lower end of the electrical connector 2. The two groups of grooves 17 are respectively engaged with the two groups of buckles 9. The PCB circuit board 4 and the pressure sensitive element 5 are soldered and connected through four groups of pressure pins 18. The PCB circuit board 4 and the temperature sensitive element 6 are soldered and connected through temperature pins 19 in the slots and blind holes that penetrate the sensitive element seat 3 and enter the boss 10 in turn. The slot cavity is filled with adhesive. By filling the adhesive, the temperature pin 19 can be fixed to prevent the soldering connection point from falling off due to shaking.

[0029] In this embodiment, a plug-in hole 20 that cooperates with the upper end of the PIN pin 13 is provided on the inner end face of the electrical connector 2. The upper end of the PIN pin 13 and the plug-in hole 20 are connected by interference fit. The lower end of the PIN pin 13 is formed by one-time extrusion to make its lower end wider and form a flat shape. After the lower end of the PIN pin 13 is inserted into the connecting hole 15, an interference fit is formed between the connecting hole 15, which replaces the traditional sensor using soft flat cable soldering connection method, improves the connection reliability, and reduces the sensor failure caused by the breakage of the soft flat cable during production or use, thereby improving the quality stability and working reliability of the sensor.

[0030] In this embodiment, the pressure sensitive element 5 is bonded in the square cavity by an adhesive and covers the upper opening of the fluid channel 12. The pressure of the fluid enters the fluid channel 12 from the gap between the support 11 and the inner wall of the threaded pipe joint 7, and transmits the pressure to the pressure sensitive element 5, so that the pressure sensitive element 5 senses the pressure of the fluid at this time. The pressure sensitive element 5 is made of a ceramic resistor. The resistance value changes under the action of pressure. The change of the resistance value is transmitted to the chip through the circuit in the PCB circuit board 4. The chip calculates and outputs the corresponding result. Finally, after amplification, it is output in the form of analog voltage to an external controller connected to the sensor through the PIN pin 13 for pressure output. The temperature sensitive element 6 is made of a ceramic resistor. When the temperature sensitive element 6 contacts with gas or liquid, the temperature change causes the temperature sensitive element resistance to change. The change of the resistance value is transmitted to the chip through the circuit of the PCB circuit board 4. The chip calculates and outputs the corresponding result. Finally, after amplification, it is output in the form of analog quantity to an external controller connected to the sensor through the PIN pin 13 for temperature output.

[0031] In this embodiment, the upper end of the sensor housing 1 is shrunk by a shrunk machine, and the gap between the shrunk portion of the upper end of the sensor housing 1 and the outer wall of the electrical connector 2 is filled with a sealant 21 .

[0032] In this embodiment, a first sealing ring 22 is sleeved on the outer periphery of the boss 10 at the lower end of the sensor seat 3 .

[0033] In this embodiment, a second sealing ring 23 is sleeved on the outside of the threaded pipe joint 7 at the lower end of the sensor housing 1 to perform sealing treatment thereto to prevent dust and steam from entering.

[0034] In this embodiment, a positioning circular hole 24 is provided on the PCB circuit board 4 for cooperating with the four groups of pressure pins 18, which replaces the traditional sensor's flexible flat cable soldering connection method, improves the reliability of the connection, and reduces the sensor failure caused by the breakage of the flexible flat cable during the manufacturing or use process, thereby improving the quality stability and working reliability of the sensor.

[0035] The present invention integrates the temperature sensitive element 6 and the pressure sensitive element 5 into one body. One sensor can detect the pressure and temperature of liquid or gas at the same time, replacing the functions of the traditional pressure sensor and temperature sensor, improving the compactness of the sensor, and bringing great convenience to the customer's application. By adopting the pressure sensitive element 5 made of ceramic resistor, the detection accuracy of the sensor is improved, the influence of temperature on the accuracy is reduced, and the working temperature range is expanded, and normal operation within the range of -40℃ to 150℃ can be achieved. The full temperature range and full range accuracy can be improved to 2% VDD, reducing temperature drift, and ensuring detection accuracy in both high and low temperature ranges;

[0036] The PCB circuit board 4 is inserted into two groups of symmetrically opened U-shaped grooves 11 on the outer wall of the lower end of the electrical connector 2, so that the horizontal position of the PCB circuit board 4 is positioned. The lower end surface of the PCB circuit board 4 abuts against the top surface of the supporting protrusion 8, and the upper end surface of the PCB circuit board 4 abuts against the positioning protrusion 16, so that the PCB circuit board 4 is positioned in the vertical direction, and the structural stability of the PCB circuit board 4 is maintained. The buckle 9 on the upper end surface of the sensitive element seat 3 is engaged with the groove on the outer wall of the lower end of the electrical connector 2, so that the relative rotation between the sensitive element seat 3 and the electrical connector 2 can be prevented to damage the connection between the electronic components;

[0037] The PCB circuit board and the pressure sensitive element are manufactured independently and connected by pin soldering, replacing the traditional integrated manufacturing of the circuit board and the sensitive element, reducing the processing difficulty and manufacturing cost and improving the quality stability.

[0038] The embodiments of the present invention described above do not constitute a limitation on the protection scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A pressure and temperature integrated sensor for new energy vehicles, characterized in that: The sensor housing (1) comprises an electrical connector (2), a sensitive element seat (3), a PCB circuit board (4), a pressure sensitive element (5), and a temperature sensitive element (6). The lower end of the sensor housing (1) is integrally formed with a threaded pipe connector (7). The sensitive element seat (3) is installed in the inner cavity of the sensor housing (1). The sensitive element seat (3) The upper end surface is provided with a square cavity, two groups of symmetrically arranged supporting protrusions (8) and two groups of symmetrically arranged buckles (9); the pressure sensitive element (5) is installed in the square cavity; a boss (10) is provided at the lower end of the sensitive element seat (3); a support (11) extending downward and extending from the lower end of the threaded pipe joint (7) is provided on the boss (10); a blind hole is provided at the lower end of the support (11); the temperature sensitive element (6) is installed in the blind hole; a fluid channel (12) is vertically provided inside the boss (10); the upper end of the fluid channel (12) is communicated with the square cavity; the lower end of the fluid channel (12) is located on the lower end surface of the boss (10) and is communicated with the gap between the support (11) and the inner wall of the threaded pipe joint (7); a groove similar to the blind hole is also vertically provided on the integral structure composed of the boss (10) and the support (11); The lower end of the electrical connector (2) is placed inside the sensor housing (1). Four PIN pins (13) are vertically inserted on the inner end surface of the electrical connector (2). The PCB circuit board (4) is inserted into two groups of symmetrically opened U-shaped grooves (14) on the outer wall of the lower end of the electrical connector (2). The PCB circuit board (4) is provided with four groups of connection holes (15) respectively connected to the lower ends of the four PIN pins (13). The lower ends of the PIN pins (13) are widened to form a flat shape. After the lower ends of the PIN pins (13) are inserted into the connection holes (15), an interference fit is formed between the connection holes (15). A positioning protrusion (16) for abutting against the upper end surface of the PCB circuit board (4) is also provided on the inner end surface of the electrical connector (2). The lower end surface of the PCB circuit board (4) abuts against the top surface of the supporting protrusion (8). Two groups of symmetrically opened grooves (17) are also provided on the outer wall of the lower end of the electrical connector (2). The two groups of grooves (17) are respectively engaged with the two groups of buckles (9); the PCB circuit board (4) and the pressure sensitive element (5) are connected by soldering via four groups of pressure pins (18); the PCB circuit board (4) and the temperature sensitive element (6) are connected by soldering via temperature pins (19) that penetrate the sensitive element seat (3) and sequentially enter the slots and blind holes on the boss (10); the slot cavities are filled with adhesive.

2. The integrated pressure and temperature sensor for new energy vehicles according to claim 1, characterized in that: An inserting hole (20) that matches with the upper end of the PIN needle (13) is provided on the inner end surface of the electrical connector (2), and the upper end of the PIN needle (13) is connected to the inserting hole (20) by interference fit.

3. The integrated pressure and temperature sensor for new energy vehicles according to claim 1, characterized in that: The lower end of the PIN needle (13) is connected to the connecting hole (15) by interference fit.

4. The integrated pressure and temperature sensor for new energy vehicles according to claim 1, characterized in that: The pressure sensitive element (5) is bonded in the square cavity by an adhesive and covers the upper opening of the fluid channel (12).

5. The integrated pressure and temperature sensor for new energy vehicles according to claim 1, characterized in that: The upper end of the sensor housing (1) is shrunk by a shrunk machine.

6. The integrated pressure and temperature sensor for new energy vehicles according to claim 5, characterized in that: The gap between the shrinkage at the upper end of the sensor housing (1) and the outer wall of the electrical connector (2) is filled with sealing glue (21).

7. The integrated pressure and temperature sensor for new energy vehicles according to claim 1, characterized in that: A first sealing ring (22) is sleeved on the outer periphery of the boss (10) at the lower end of the sensitive element seat (3).

8. The integrated pressure and temperature sensor for new energy vehicles according to claim 1, characterized in that: A second sealing ring (23) is sleeved on the outside of the threaded pipe joint (7) at the lower end of the sensor housing (1).

9. The integrated pressure and temperature sensor for new energy vehicles according to claim 1, characterized in that: The pressure sensitive element (5) and the temperature sensitive element (6) are both made of ceramic resistors.

10. The integrated pressure and temperature sensor for new energy vehicles according to claim 1, characterized in that: The PCB circuit board (4) is provided with positioning circular holes (24) that are cooperatively connected to the four groups of pressure pins (18).

Images