Pressure sensor

Abstract

A pressure sensor disclosed by the present invention comprises: a housing defining a mounting cavity, the housing comprising an end button and a main housing, the main housing being provided with a pressure introduction channel; a pressure measuring assembly; and a plurality of terminal assemblies combined on the terminal button, wherein each terminal assembly comprises a first shell element and a second shell element; a conductive connector; the first conductive terminal is fixed on the first shell element and is electrically connected to the conductive connecting piece, and one end, far away from the conductive connecting piece, of the first conductive terminal extends to the outside of the first shell element; the second conductive terminal is fixed on the second shell element and is electrically connected to the conductive connecting piece; the second conductive terminal is electrically contacted to the pressure measuring assembly; according to the invention, through the arrangement of the combined terminal button and the terminal assembly, the terminal assembly can be detached, the number of the terminal assembly can be selected according to different connection protocols, and the compatibility is better.

Description

Technical Field

[0001] The invention belongs to the technical field of pressure detection, and in particular relates to a pressure sensor. Background Art

[0002] Pressure sensors are sensors used to measure the pressure of the environment or medium. Currently, they are mostly implemented through MEMS (micro-electromechanical systems), that is, the pressure is measured through the piezoresistive effect of semiconductor silicon. Among them, the middle part of the silicon core is set to be a diaphragm. The pressure applied to the silicon diaphragm on both sides causes the resistance value of the doped resistor on the silicon diaphragm to change. The current or voltage signal output by the measurement circuit composed of several resistors can be further processed by the conditioning circuit and then output the measurement result to the outside. When a vacuum cavity is set on one side of the diaphragm in the silicon chip, the measured pressure is the pressure applied on the other side relative to the vacuum pressure, that is, the absolute pressure; when atmospheric pressure is introduced on one side of the diaphragm, the measured pressure is the pressure relative to the atmosphere, that is, the gauge pressure; when other pressures are introduced on both sides of the diaphragm, the measured pressure is the difference between the pressures on both sides, that is, the differential pressure. In some other sensors, temperature sensitive elements can also be integrated to measure the pressure and temperature of the medium at the same time.

[0003] The pressure sensor also includes terminals for electrical connection with the outside world. The terminals need to be connected to the electronic module assembly (EMA) of the pressure sensor. The use of spring terminals can facilitate assembly (no need to connect EMA and terminals by welding or bonding). The electronic module assembly (EMA) includes a circuit board. Setting the circuit board vertically can increase the area of ​​the circuit board, thereby relatively reducing the volume of the sensor.

[0004] A Chinese utility model patent with publication number CN219104249U discloses a pressure sensor, which includes: a pressure connector, in which a longitudinally extending pressure channel is provided; a pressure sensitive head, a longitudinal distal end of which is recessed inward to form a connecting tube with a sensing cavity facing the distal end, and a longitudinal proximal end of which forms an elastic diaphragm accordingly, a surface of the longitudinal proximal end of the elastic diaphragm is provided with a pressure measuring circuit, the proximal end of the connecting tube is sealedly connected to the pressure connector to connect the proximal end of the pressure channel to the sensing cavity; a terminal and a shell that together with the pressure connector enclose a mounting cavity, the proximal and distal ends of the shell are sealedly connected to the terminal and the pressure connector in a one-to-one correspondence; a support seat and a signal processing component arranged in the mounting cavity, the signal processing component having a circuit board snapped onto the proximal end of the support seat, the circuit board being electrically connected to the pressure measuring circuit; and a plurality of electrical connectors that are electrically connected to the circuit board after passing through the terminal.

[0005] The terminals of this pressure sensor are not removable and are suitable for only one connection protocol. Summary of the invention

[0006] An object of the present invention is to provide a pressure sensor to solve at least one of the above technical problems.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A pressure sensor, comprising:

[0009] A housing enclosing a mounting cavity comprises a terminal button and a main housing, wherein the main housing is provided with a pressure introduction channel for introducing a medium to be measured;

[0010] A pressure measuring component disposed in the installation cavity to measure the pressure of the medium to be measured;

[0011] and a plurality of terminal assemblies assembled on the terminal button, each terminal assembly comprising:

[0012] A first shell element and a second shell element fixed to both longitudinal sides;

[0013] a conductive connector molded on the first shell element or the second shell element;

[0014] a first conductive terminal fixed on the first shell element and electrically connected to a side of the conductive connector away from the mounting cavity, wherein one end of the first conductive terminal away from the conductive connector extends to the outside of the first shell element;

[0015] and a second conductive terminal fixed on the second shell element and electrically connected to a side of the conductive connector facing the mounting cavity, wherein the second conductive terminal is electrically in contact with the pressure measurement component.

[0016] The present invention provides a combined terminal button and a terminal assembly so that the terminal assembly can be disassembled, which is convenient for selecting the number of terminal assemblies according to different connection protocols and has better compatibility; the first shell element and the second shell element are respectively used to fix the first conductive terminal and the second conductive terminal, and the conductive connector is used to electrically connect the first conductive terminal and the second conductive terminal. The first conductive terminal, the conductive connector and the second conductive terminal cooperate to electrically connect the external device with the pressure measurement assembly.

[0017] Furthermore, the first conductive terminal and the conductive connecting member are integrally formed, thereby enhancing the structural strength of the first conductive terminal and the conductive connecting member, simplifying the production process, and reducing the production cost.

[0018] Furthermore, the first conductive terminal and the conductive connecting member are combined to form a terminal in a nail shape, thereby increasing the fixing strength of the first conductive terminal and the conductive connecting member.

[0019] Furthermore, the first conductive terminal is molded and fixed on the first shell element, thereby increasing the sealing between the first conductive terminal and the first shell element and increasing the fixing strength of the first conductive terminal.

[0020] Furthermore, the second conductive terminal is a spring terminal, and a holding cavity for accommodating the spring terminal is formed in the second shell element to facilitate electrical connection between the second conductive terminal and the pressure measurement component.

[0021] Furthermore, the spring terminal includes a first spring segment, a transition segment and a second spring segment which are sequentially arranged in a direction away from the conductive connecting member, the outer diameter of the first spring segment is larger than the outer diameter of the second spring segment, a limiting segment is formed at the lower portion of the retaining cavity, the inner diameter of the limiting segment is larger than the outer diameter of the second spring segment and smaller than the outer diameter of the first spring segment, so that the first spring segment is fixed in the retaining cavity and the second spring segment can extend out of the retaining cavity, which facilitates the assembly of the terminal assembly and the electrical connection of the spring terminal to the pressure measurement assembly.

[0022] Furthermore, the top of the spring terminal is a conical profile, which facilitates electrical contact with the conductive connecting piece.

[0023] Furthermore, the second spring segment is tightly coiled to form a rigid portion, so that the portion of the spring terminal extending out of the holding cavity has a certain rigidity and is not easy to bend, thereby facilitating accurate electrical contact with the pressure measurement component.

[0024] Furthermore, the top edge of the first shell element protrudes laterally to form a circle of first waterproof flange, and the first waterproof flange covers the connection between the terminal assembly and the terminal button, which can play a certain waterproof role.

[0025] Furthermore, multiple first shell elements are integrally formed to form a first shell, and the top edge of the first shell protrudes laterally to form a circle of second waterproof flange. By integrally forming multiple first shell elements, it is convenient to disassemble the first shell element as a whole, and by providing the second waterproof flange to cover the connection between the terminal assembly and the terminal button, it can play a certain waterproof role.

[0026] Furthermore, the plurality of second shell elements are integrally formed to form a spring retainer, which facilitates the overall disassembly of the plurality of second shell elements.

[0027] Furthermore, the vacant places of the terminal assemblies on the terminal button are plugged with sealing plugs, and part of the terminal assemblies can be replaced by the sealing plugs to be assembled on the terminal button, so that the number of terminal assemblies that need to be assembled on the terminal button can be reasonably controlled to match different connection protocols. The sealing plugs can play a sealing role to prevent water from entering the place on the terminal button for installing the terminal assemblies, and only one specification of terminal button needs to be produced to meet multiple connection protocols.

[0028] Furthermore, the conductive connector seals the bottom end of the first shell element, and the first conductive terminal may not be provided on one or more first shell elements. The conductive connector plays a sealing role, and only one specification of terminal needs to be produced to meet multiple connection protocols.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention provides a combined terminal button and a terminal assembly so that the terminal assembly can be disassembled, which is convenient for selecting the number of terminal assemblies according to different connection protocols and has better compatibility; the first shell element and the second shell element are respectively used to fix the first conductive terminal and the second conductive terminal, and the conductive connector is used to electrically connect the first conductive terminal and the second conductive terminal. The first conductive terminal, the conductive connector and the second conductive terminal cooperate to electrically connect the external device with the pressure measurement assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the pressure sensor in the first embodiment;

[0032] Figure 2 for Figure 1 A partial enlarged view of the middle part;

[0033] Figure 3 is a schematic structural diagram of a terminal assembly in the first embodiment;

[0034] Figure 4 is a schematic structural diagram of a terminal assembly according to a second embodiment;

[0035] Figure 5 is a schematic structural diagram of a terminal assembly according to a third embodiment;

[0036] Figure 6 It is a partial structural schematic diagram of the pressure sensor of the fourth embodiment;

[0037] Figure 7 is a schematic structural diagram of a pressure sensor in a fifth embodiment;

[0038] Figure 8 is a schematic structural diagram of a pressure sensor in a sixth embodiment;

[0039] In the figure: 1. shell; 101. installation cavity; 102. main shell; 103. terminal; 104. pressure introduction channel; 105. substrate; 106. connection channel; 2. pressure measurement component; 201. pressure sensitive element; 202. circuit board; 203. processing circuit; 3. terminal assembly; 301. first shell element; 302. second shell element; 303. conductive connector; 304. first conductive terminal; 305. second conductive terminal; 306. first spring segment; 307. transition segment; 308. second spring segment; 4. retaining cavity; 5. limiting segment; 6. first waterproof flange; 7. first shell; 8. second waterproof flange; 9. spring retainer; 10. sealing plug. DETAILED DESCRIPTION

[0040] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. 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.

[0041] like Figures 1 to 3 As shown, in the first embodiment, the pressure sensor includes a housing 1 enclosing a mounting cavity 101 , a pressure measuring assembly 2 and a plurality of terminal assemblies 3 .

[0042] The housing 1 includes a terminal 103 and a main shell 102. The main shell 102 is provided with a pressure introduction channel 104 for introducing a medium to be measured. A substrate 105 is also provided in the installation cavity 101. The substrate 105 is sealed to one end of the inner side of the pressure introduction channel 104. The substrate 105 is longitudinally opened with a connecting channel 106 for introducing the pressure medium into the pressure measurement component 2. The substrate 105 is made of metal material. In some other schemes, the substrate 105 can also be made of ceramic material.

[0043] The pressure measuring assembly 2 is arranged in the mounting cavity 101 to measure the pressure of the medium to be measured. The pressure measuring assembly 2 may include a pressure sensitive element 201, a circuit board 202 arranged on the upper surface of the substrate 105, and a processing circuit 203 arranged on the upper surface of the circuit board 202. The pressure sensitive element 201 is sealed to one end of the inner side of the connecting channel 106 to receive the pressure of the medium to be measured and convert the pressure into an electrical signal. The pressure sensitive element 201 is electrically connected to the processing circuit 203. The processing circuit 203 is used to process the electrical signal generated by the pressure sensitive element 201. When the circuit board 202 and the substrate 105 are both made of ceramic materials, they can also be integrated into one component, and this integrated component can be called a mounting seat or a substrate.

[0044] A plurality of terminal assemblies 3 are assembled on the terminal button 103. Preferably, the terminal assemblies 3 and the terminal button 103 can be connected by plugging. Figure 3As shown, each terminal assembly 3 includes a first shell element 301, a second shell element 302, a conductive connector 303, a first conductive terminal 304 and a second conductive terminal 305. A mounting hole for mounting the terminal assembly 3 is provided on the terminal button 103. The first shell element 301 and the second shell element 302 are fixed on both longitudinal sides of the mounting hole. Specifically, the first shell element 301 and the second shell element 302 can both be tightly connected to the mounting hole, and the first shell element 301 and the second shell element 302 can be fixedly bonded together by a fixing glue. The conductive connector 303 is molded at the bottom of the first shell element 301, and preferably, the conductive connector 303 can also be molded at the top of the second shell element 302.

[0045] The first conductive terminal 304 is fixed on the first shell element 301 and electrically connected to the side of the conductive connector 303 away from the installation cavity 101. Preferably, the first conductive terminal 304 can be fixed on the first shell element 301 by molding, thereby increasing the sealing between the first conductive terminal 304 and the first shell element 301, and increasing the strength of the first conductive terminal 304 being fixed. One end of the first conductive terminal 304 away from the conductive connector 303 extends to the outside of the first shell element 301 to connect with an external device. Preferably, the top edge of the first shell element 301 can protrude laterally to form a circle of the first waterproof flange 6. The first waterproof flange 6 covers the connection between the terminal assembly 3 and the terminal button 103, and can play a certain waterproof role. The outer wall of the first waterproof flange 6 can form a certain slope.

[0046] The second conductive terminal 305 is fixed on the second shell element 302 and electrically connected to the side of the conductive connector 303 facing the installation cavity 101. The second conductive terminal 305 is electrically connected to the pressure measurement component 2. Specifically, the second conductive terminal 305 is in contact with the circuit board 202 and is electrically connected to the processing circuit 203. Figure 3As shown, the second conductive terminal 305 can be a spring terminal, and a holding cavity 4 for accommodating the spring terminal is formed in the second shell element 302, so as to facilitate the electrical connection between the second conductive terminal 305 and the pressure measurement component 2. Further, the spring terminal includes a first spring segment 306, a transition segment 307 and a second spring segment 308 arranged in sequence in a direction away from the conductive connector 303, the outer diameter of the first spring segment 306 is larger than the outer diameter of the second spring segment 308, and a limiting segment 5 is formed at the lower part of the holding cavity 4, the inner diameter of the limiting segment 5 is larger than the outer diameter of the second spring segment 308 and smaller than the outer diameter of the first spring segment 306, so that the first spring segment 306 is fixed in the holding cavity 4, and the second spring segment 308 can extend out of the holding cavity 4, so as to facilitate the assembly of the terminal component 3 and the electrical connection between the spring terminal and the pressure measurement component 2. Preferably, the top of the spring terminal can be set to a conical profile to facilitate electrical contact with the conductive connector 303. Preferably, the second spring segment 308 can be tightly coiled to form a rigid portion, so that the portion of the spring terminal extending out of the holding cavity 4 has a certain rigidity and is not easy to bend, thereby facilitating accurate electrical contact with the pressure measurement component 2 .

[0047] The present invention provides a combined terminal button 103 and a terminal assembly 3 so that the terminal assembly 3 can be disassembled, which is convenient for selecting the number of terminal assemblies 3 according to different connection protocols and has better compatibility; the first shell element 301 and the second shell element 302 are respectively used to fix the first conductive terminal 304 and the second conductive terminal 305, and the conductive connector 303 is used to electrically connect the first conductive terminal 304 and the second conductive terminal 305. The first conductive terminal 304, the conductive connector 303 and the second conductive terminal 305 cooperate to electrically connect the external device with the pressure measurement component 2.

[0048] like Figure 4 As shown, the pressure sensor of the second embodiment of the present application is different from the first embodiment in that the first conductive terminal 304 and the conductive connecting member 303 can be integrally formed, thereby enhancing the structural strength of the first conductive terminal 304 and the conductive connecting member 303, simplifying the production process, and reducing the production cost. Figure 4 As shown, the lateral dimension of the conductive connector 303 is greater than the lateral dimension of the lower end of the first conductive terminal 304 , and the first conductive terminal 304 and the conductive connector 303 are integrally connected to form a nail-shaped terminal, thereby increasing the fixing strength of the first conductive terminal 304 and the conductive connector 303 .

[0049] like Figure 5 As shown, the third embodiment of the present application is different from the above embodiments in that the first conductive terminal 304 can also be a spring terminal.

[0050] like Figure 6As shown, the pressure sensor of the fourth embodiment of the present application is different from the above embodiments in that a plurality of first shell elements 301 can be connected as a whole to form a first shell 7, and the top edge of the first shell 7 can also protrude laterally to form a circle of second waterproof flange 8. By forming a plurality of first shell elements 301 as a whole, it is convenient to disassemble the first shell element 301 as a whole, and by setting the second waterproof flange 8 to cover the connection between the terminal assembly 3 and the terminal button 103, it can play a certain waterproof role. In the above embodiments, a spring buckle can be formed on the outer side wall of the second shell element 302 to prevent the first shell element 301 from detaching from the terminal button 103 outward. In this way, the first shell element 301 is fixed to the terminal button 103 from the inside and outside respectively by the spring buckle matching the first waterproof flange 6 or the second waterproof flange 8.

[0051] Preferably, if Figure 6 As shown, the plurality of second shell elements can be integrally connected to form a spring retainer 9, so as to facilitate the integral installation and removal of the plurality of second shell elements 302.

[0052] like Figure 7 As shown, the pressure sensor of the fifth embodiment of the present application is different from the above embodiments in that there is not a one-to-one correspondence between the mounting holes and the terminal assemblies 3, the number of mounting holes is greater than the number of terminal assemblies 3, the terminal assemblies 3 are combined into the mounting holes, and the mounting holes without the terminal assemblies 3 can be plugged with sealing plugs 10, and the sealing plugs 10 can replace part of the terminal assemblies 3 to be combined on the terminal button 103, and the number of terminal assemblies 3 that need to be combined on the terminal button 103 can be reasonably controlled to match different connection protocols. The sealing plugs 10 can play a sealing role to prevent water from entering the mounting holes on the terminal button 103 for installing the terminal assemblies 3, and only one specification of terminal button 103 needs to be produced to meet multiple connection protocols.

[0053] like Figure 8 As shown, the pressure sensor of the sixth embodiment of the present application is different from the above embodiments in that the conductive connector 303 can seal the bottom end of the first shell element 301, and the first conductive terminal 304 can be omitted from one or more first shell elements 301. The conductive connector 303 plays a sealing role, and only one specification of terminal 103 needs to be produced to meet multiple connection protocols.

[0054] It should be noted that although the present invention is disclosed as above by specific embodiments, the above embodiments are not intended to limit the present invention. Ordinary technicians in this field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A pressure sensor, characterized in that: include: A housing enclosing a mounting cavity comprises a terminal button and a main housing, wherein the main housing is provided with a pressure introduction channel for introducing a medium to be measured; A pressure measuring component disposed in the installation cavity to measure the pressure of the medium to be measured; and a plurality of terminal assemblies assembled on the terminal button, each terminal assembly comprising: A first shell element and a second shell element fixed to both longitudinal sides; a conductive connector molded on the first shell element or the second shell element; a first conductive terminal fixed on the first shell element and electrically connected to a side of the conductive connector away from the mounting cavity, wherein one end of the first conductive terminal away from the conductive connector extends to the outside of the first shell element; and a second conductive terminal fixed on the second shell element and electrically connected to a side of the conductive connector facing the mounting cavity, wherein the second conductive terminal is electrically in contact with the pressure measurement component.

2. The pressure sensor according to claim 1, characterized in that: The first conductive terminal and the conductive connecting member are integrally formed.

3. The pressure sensor according to claim 2, characterized in that: The first conductive terminal and the conductive connecting member are combined to form a nail-shaped terminal.

4. The pressure sensor according to claim 1, characterized in that: The first conductive terminal is molded and fixed on the first shell element.

5. The pressure sensor according to claim 1, characterized in that: The second conductive terminal is a spring terminal, and a holding cavity for accommodating the spring terminal is formed in the second shell element.

6. The pressure sensor according to claim 5, characterized in that: The spring terminal includes a first spring segment, a transition segment and a second spring segment which are sequentially arranged in a direction away from the conductive connecting member, the outer diameter of the first spring segment is larger than the outer diameter of the second spring segment, a limited position segment is formed at the lower portion of the retaining cavity, and the inner diameter of the limited position segment is larger than the outer diameter of the second spring segment and smaller than the outer diameter of the first spring segment.

7. The pressure sensor according to claim 5, characterized in that: The top of the spring terminal has a tapered profile.

8. The pressure sensor according to claim 6, characterized in that: The second spring section is tightly coiled to form a rigid portion.

9. The pressure sensor according to claim 1, characterized in that: The top edge of the first shell element protrudes laterally to form a circle of first waterproof flange.

10. The pressure sensor according to claim 1, characterized in that: The plurality of first shell elements are integrally formed to form a first shell, and the top edge of the first shell protrudes laterally to form a circle of second waterproof flange.

Images