Pressure detection module and pressure sensor

Abstract

The invention discloses a pressure detection module and a pressure sensor. The pressure detection module comprises a pressure joint used for being connected to a detected pipeline and provided with a fluid passage used for being in fluid communication with the detected pipeline; the force sensitive component is connected to one end of the pressure joint and is in fluid communication with the pressure joint; the strain gauge is attached to the surface of the force sensitive part and is used for detecting the strain of the force sensitive part; the electric connector comprises a seat body and a contact pin which passes through and is fixed on the seat body; the electric connection plate is used for electrically connecting the contact pin to the strain gauge; and the end cap comprises a peripheral wall, an end wall and an opening opposite to the end wall. The force sensitive part and the electric connecting plate are accommodated in the inner cavity of the end cap, and one end of the pressure joint is welded to the opening end of the end cap so as to seal the opening of the end cap; an insertion hole is formed in the end wall of the end cap, and the seat body is inserted into the insertion hole and welded to the end wall so as to seal the insertion hole of the end cap. The sealing structure is simple, high in sealing reliability and low in cost.

Description

Technical Field

[0001] The invention relates to a pressure detection module and a pressure sensor comprising the pressure detection module. Background Art

[0002] In the prior art, absolute pressure sensors usually include oil-filled pressure sensors and strain gauge pressure sensors. Oil-filled pressure sensors are more expensive and have the risk of oil leakage. Strain gauge pressure sensors require the strain gauge to be sealed in a closed space. The existing sealing solutions for strain gauge pressure sensors are relatively complex, have low reliability, and are costly. Summary of the invention

[0003] The purpose of the present invention is to solve at least one aspect of the above-mentioned problems and defects in the prior art.

[0004] According to one aspect of the present invention, a pressure detection module is provided. The pressure detection module includes: a pressure connector, which is used to connect to a detected pipeline and has a fluid passage for communicating with the detected pipeline fluid; a force-sensitive component, which is connected to one end of the pressure connector and is in fluid communication with the pressure connector; a strain gauge, which is attached to the surface of the force-sensitive component and is used to detect the strain of the force-sensitive component; an electrical connector, which includes a seat body and a pin passing through and fixed to the seat body; an electrical connection board, which is used to electrically connect the pin to the strain gauge; and an end cap, which includes a peripheral wall, an end wall, and an opening opposite to the end wall. The force-sensitive component and the electrical connection board are accommodated in the inner cavity of the end cap, and one end of the pressure connector is welded to the open end of the end cap to seal the opening of the end cap; a socket is formed on the end wall of the end cap, and the seat body is inserted into the socket and welded to the end wall to seal the socket of the end cap.

[0005] According to an exemplary embodiment of the present invention, a through hole allowing the pin to pass through is formed on the base body, and the pin passes through the through hole and is bonded to the base body through a glass packaging process, so that the outer peripheral surface of the pin and the inner peripheral surface of the through hole are sealed together by sintered glass.

[0006] According to another exemplary embodiment of the present invention, the base body and the plug pin are made of the same metal material or made of metal materials with the same or similar thermal expansion coefficients; and the thermal expansion coefficients of the base body and the plug pin are the same or similar to the thermal expansion coefficient of the glass.

[0007] According to another exemplary embodiment of the present invention, the seat body and the pin are made of Kovar alloy.

[0008] According to another exemplary embodiment of the present invention, a plating layer is electroplated on the externally exposed surfaces of the seat body and the plug pins; and when electroplating the plating layer, the electrical connector is immersed in the plating liquid as a whole to simultaneously form the plating layer on the externally exposed surfaces of the seat body and the plug pins.

[0009] According to another exemplary embodiment of the present invention, an annular protrusion surrounding the socket is formed on the outer side of the end wall of the end cap, and an annular flange is formed on the outer peripheral surface of the seat body; the annular flange of the seat body axially abuts against the top surface of the annular protrusion of the end cap and is welded to the top surface of the annular protrusion to seal the socket of the end cap.

[0010] According to another exemplary embodiment of the present invention, the electrical connection board includes: a first rigid connection board, which is attached to the outer surface of the force-sensitive component and electrically connected to the strain gauge; a second rigid connection board, which is electrically connected to the pins of the electrical connector; and a flexible connection board, which is electrically connected between the first rigid connection board and the second rigid connection board.

[0011] According to another exemplary embodiment of the present invention, the first rigid connecting plate is adhered to the outer surface of the force-sensitive component by an insulating adhesive; and the first rigid connecting plate and the second rigid connecting plate are spaced apart by a predetermined distance in the axial direction of the end cap.

[0012] According to another exemplary embodiment of the present invention, the force-sensitive component has a blind hole connected to the fluid passage of the pressure connector, the bottom wall of the blind hole constitutes a diaphragm that can be elastically deformed, and the strain gauge is attached to the outer surface of the bottom wall of the blind hole for detecting the strain of the bottom wall of the blind hole.

[0013] According to another exemplary embodiment of the present invention, the force-sensitive component and the pressure joint are a single component that is integrally formed; or the force-sensitive component and the pressure joint are two independent components that are separately formed and welded together.

[0014] According to another exemplary embodiment of the present invention, the end cap, the force-sensitive component and the pressure connector are made of stainless steel, and the seat and the pin of the electrical connector are made of Kovar alloy.

[0015] According to another exemplary embodiment of the present invention, the pressure detection module further includes: a threaded sleeve, which is sleeved on the other end of the pressure connector and formed with an external thread for threaded connection with the connecting end of the detected pipeline to connect the pressure connector to the detected pipeline.

[0016] According to another aspect of the present invention, a pressure sensor is provided, comprising: an outer shell; and the aforementioned pressure detection module, which is partially installed in the outer shell, wherein the end cap and one end of the pressure connector are accommodated in the outer shell, and the other end of the pressure connector is located outside the outer shell for connecting to a detected pipeline.

[0017] According to an exemplary embodiment of the present invention, the outer shell has a first port and a second port axially opposite to each other, and the end cap and one end of the pressure joint are inserted into the first port of the outer shell; a welding flange is formed on the outer circumferential surface of one end of the pressure joint, and the outer circumferential surface of the welding flange is welded to the inner circumferential surface of the first port of the outer shell.

[0018] According to another exemplary embodiment of the present invention, the pressure sensor further includes: a functional circuit board accommodated in the outer shell and electrically connected to the pins of the electrical connector; and an external connector mounted to the second port of the outer shell and electrically connected to the functional circuit board.

[0019] According to another exemplary embodiment of the present invention, the external connector includes: a body mounted on the second port of the outer housing; and a terminal provided in the body and electrically connected to the functional circuit board.

[0020] According to another exemplary embodiment of the present invention, the pressure sensor also includes: a first adapter circuit board for electrically connecting the pins of the electrical connector to the functional circuit board; and a second adapter circuit board for electrically connecting the terminals of the external connector to the functional circuit board.

[0021] According to another exemplary embodiment of the present invention, the first adapter circuit board includes: a first rigid circuit board electrically connected to the pins of the electrical connector; and a first flexible circuit board electrically connected between the first rigid circuit board and the functional circuit board.

[0022] According to another exemplary embodiment of the present invention, the second adapter circuit board includes: a second rigid circuit board electrically connected to the terminals of the external connector; and a second flexible circuit board electrically connected between the second rigid circuit board and the functional circuit board.

[0023] According to another exemplary embodiment of the present invention, the pressure sensor also includes: a first adapter connector having a first connecting terminal electrically connecting the first flexible circuit board and the functional circuit board; and a second adapter connector having a second connecting terminal electrically connecting the second flexible circuit board and the functional circuit board.

[0024] According to another exemplary embodiment of the present invention, the pressure sensor further comprises: a support frame, which is fixed to the end cap and is used to install and hold the functional circuit board.

[0025] In the aforementioned exemplary embodiments of the present invention, the opening and the socket of the end cap are sealed by the pressure connector and the electrical connector respectively, so that the force-sensitive component and the strain gauge are sealed in the inner cavity of the end cap, and the sealing structure of the present invention is simple, the sealing reliability is high and the cost is low.

[0026] In some of the aforementioned exemplary embodiments according to the present invention, the electrical connection board electrically connected to the pins of the electrical connector is flexible, so that no stress is applied to the pins, thereby not destroying the seal between the pins of the electrical connector and the seat body, thereby improving the sealing reliability.

[0027] In some of the aforementioned exemplary embodiments according to the present invention, the end cap is welded to the end of the pressure connector instead of being directly welded to the force-sensitive component, thereby not causing adverse effects on the force-sensitive component and improving the pressure detection accuracy.

[0028] In some of the aforementioned exemplary embodiments of the present invention, the seat body of the electrical connector is welded to the end cap instead of being bonded to the end cap through a glass packaging process, thereby not causing changes in the size of the end cap, ensuring the stability of the end cap size, and further improving the sealing performance.

[0029] In some of the aforementioned exemplary embodiments according to the present invention, the entire electrical connector can be immersed in the plating solution and a plating layer can be plated on the exposed surfaces of the socket and pins of the electrical connector at one time without single-end plating of multiple pins and sockets, thereby simplifying the plating process.

[0030] Other objects and advantages of the present invention will become apparent from the following description of the present invention with reference to the accompanying drawings, which will help to provide a comprehensive understanding of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A perspective cross-sectional view showing a pressure detection module according to an exemplary embodiment of the present invention;

[0032] Figure 2 An exploded schematic diagram showing a pressure detection module according to an exemplary embodiment of the present invention;

[0033] Figure 3 A perspective schematic diagram showing an end cap portion of a pressure detection module according to an exemplary embodiment of the present invention;

[0034] Figure 4An exploded schematic diagram showing an end cap portion of a pressure detection module according to an exemplary embodiment of the present invention;

[0035] Figure 5 A perspective schematic diagram showing a pressure sensor according to an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0036] The technical solution of the present invention is further specifically described below by examples and in conjunction with the accompanying drawings. In the specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the present invention and should not be construed as a limitation of the present invention.

[0037] In addition, in the detailed description below, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the disclosed embodiments. However, it is apparent that one or more embodiments may be implemented without these specific details. In other cases, known structures and devices are embodied in a schematic manner to simplify the accompanying drawings.

[0038] According to an overall technical concept of the present invention, a pressure detection module is provided. The pressure detection module includes: a pressure connector, which is used to connect to a detected pipeline and has a fluid passage for communicating with the detected pipeline fluid; a force-sensitive component, which is connected to one end of the pressure connector and is in fluid communication with the pressure connector; a strain gauge, which is attached to the surface of the force-sensitive component and is used to detect the strain of the force-sensitive component; an electrical connector, which includes a seat body and a pin passing through and fixed to the seat body; an electrical connection plate, which is used to electrically connect the pin to the strain gauge; and an end cap, which includes a peripheral wall, an end wall, and an opening opposite to the end wall. The force-sensitive component and the electrical connection plate are accommodated in the inner cavity of the end cap, and one end of the pressure connector is welded to the open end of the end cap to seal the opening of the end cap; a socket is formed on the end wall of the end cap, and the seat body is inserted into the socket and welded to the end wall to seal the socket of the end cap.

[0039] According to another general technical concept of the present invention, a pressure sensor is provided. The pressure sensor comprises: an outer shell; and the aforementioned pressure detection module, which is partially installed in the outer shell, the end cap and one end of the pressure connector are accommodated in the outer shell, and the other end of the pressure connector is located outside the outer shell for connecting to a detected pipeline.

[0040] Figure 1 A perspective cross-sectional view showing a pressure detection module according to an exemplary embodiment of the present invention; Figure 2 An exploded schematic diagram showing a pressure detection module according to an exemplary embodiment of the present invention; Figure 3 A perspective schematic diagram showing an end cap portion of a pressure detection module according to an exemplary embodiment of the present invention; Figure 4 An exploded schematic diagram showing an end cap portion of a pressure detection module according to an exemplary embodiment of the present invention.

[0041] like Figures 1 to 4 As shown, in an exemplary embodiment of the present invention, a pressure detection module is disclosed. The pressure detection module includes: a pressure joint 22, a force-sensitive component 21, a strain gauge (not shown), an electrical connector 3, an electrical connection board 6 and an end cap 1. The pressure joint 22 is used to connect to the customer's detected pipeline (not shown) and has a fluid passage 202 for communicating with the fluid of the detected pipeline. The force-sensitive component 21 is connected to one end 220 of the pressure joint 22 and is in fluid communication with the pressure joint 22. The strain gauge is attached to the surface of the force-sensitive component 21 and is used to detect the strain (i.e., the amount of elastic deformation) of the force-sensitive component 21. The electrical connector 3 includes a seat body 30 and a pin 31 passing through and fixed to the seat body 30. The electrical connection board 6 is used to electrically connect the pin 31 to the strain gauge. The end cap 1 includes a peripheral wall 10, an end wall 12 and an opening 11 opposite to the end wall 12.

[0042] like Figures 1 to 4 As shown, in the illustrated embodiment, the force-sensitive component 21 and the electrical connection plate 6 are accommodated in the inner cavity of the end cap 1, and one end 220 of the pressure connector 22 is welded to the open end of the end cap 1 to seal the opening 11 of the end cap 1. A socket 13 is formed on the end wall 12 of the end cap 1, and the seat body 30 is inserted into the socket 13 and welded to the end wall 12 to seal the socket 13 of the end cap 1.

[0043] like Figures 1 to 4 As shown, in the illustrated embodiment, the opening 11 and the socket 13 of the end cap 1 are sealed by the pressure connector 22 and the electrical connector 3 respectively, so that the force-sensitive component 21 and the strain gauge are both sealed in the inner cavity of the end cap 1, and the sealing structure of the present invention is simple, the sealing reliability is high and the cost is low.

[0044] like Figures 1 to 4 As shown, in the illustrated embodiment, the end cap 1 is welded to the end 220 of the pressure connector 22 instead of being directly welded to the force-sensitive component 21, thereby not causing adverse effects on the force-sensitive component 21 and improving the pressure detection accuracy.

[0045] like Figures 1 to 4 As shown, in the illustrated embodiment, a through hole 301 is formed on the base body 30 to allow the pin 31 to pass through. The pin 31 passes through the through hole 301 and is bonded to the base body 30 through a glass packaging process, so that the outer peripheral surface of the pin 31 and the inner peripheral surface of the through hole 301 are sealed together by sintered glass 32.

[0046] like Figures 1 to 4 As shown, in the embodiment shown in the figure, the seat body 30 and the plug pin 31 are made of the same metal material or made of metal materials with the same or similar thermal expansion coefficients. The thermal expansion coefficients of the seat body 30 and the plug pin 31 are the same or similar to the thermal expansion coefficient of the glass 32. In this way, it is possible to effectively prevent a gap from appearing between the seat body 30 and the plug pin 31 during thermal expansion and contraction, thereby improving the sealing reliability between the seat body 30 and the plug pin 31.

[0047] like Figures 1 to 4 As shown, in an exemplary embodiment of the present invention, the base 30 and the pin 31 may be made of Kovar alloy. This is because the thermal expansion coefficient of Kovar alloy is very close to the thermal expansion coefficient of glass 32. However, the present invention is not limited to the illustrated embodiment, and the base 30 and the pin 31 may also be made of other suitable metal materials.

[0048] like Figures 1 to 4 As shown, in the illustrated embodiment, a plating layer (not shown) is electroplated on the exposed surfaces of the seat body 30 and the plug pins 31. When electroplating the plating layer, the electrical connector 3 is immersed in the plating solution as a whole to simultaneously form a plating layer on the exposed surfaces of the seat body 30 and the plug pins 31. Therefore, the present invention does not require single-end electroplating of multiple plug pins 31 and the seat body 30, simplifying the electroplating process.

[0049] like Figures 1 to 4 As shown, in the illustrated embodiment, an annular protrusion 14 surrounding the insertion hole 13 is formed on the outer side of the end wall 12 of the end cap 1, and an annular flange 302 is formed on the outer peripheral surface of the seat body 30. The annular flange 302 of the seat body 30 axially abuts against the top surface of the annular protrusion 14 of the end cap 1 and is welded to the top surface of the annular protrusion 14 to seal the insertion hole 13 of the end cap 1.

[0050] like Figures 1 to 4 As shown, in the illustrated embodiment, the electrical connection board 6 includes: a first rigid connection board 61, a second rigid connection board 62 and a flexible connection board 63. The first rigid connection board 61 is attached to the outer surface of the force-sensitive component 21 and is electrically connected to the strain gauge. The second rigid connection board 62 is electrically connected to the pin 31 of the electrical connector 3. The flexible connection board 63 is electrically connected between the first rigid connection board 61 and the second rigid connection board 62. In the illustrated embodiment, since the flexible connection board 63 is flexible, stress will not be applied to the pin 31, so that the pin 31 will not move relative to the seat body 30, thereby not destroying the seal between the pin 31 of the electrical connector 3 and the seat body 30, thereby improving the sealing reliability.

[0051] like Figures 1 to 4As shown, in the illustrated embodiment, the first rigid connecting plate 61 is adhered to the outer surface of the force-sensitive component 21 by an insulating adhesive 61a. The first rigid connecting plate 61 and the second rigid connecting plate 62 are spaced apart by a predetermined distance in the axial direction of the end cap 1.

[0052] like Figures 1 to 4 As shown, in the illustrated embodiment, the force-sensitive component 21 has a blind hole 201 connected to the fluid passage 202 of the pressure connector 22, the bottom wall 21a of the blind hole 201 constitutes a diaphragm capable of elastic deformation, and a strain gauge is attached to the outer surface of the bottom wall 21a of the blind hole 201 to detect the strain of the bottom wall 21a of the blind hole 201. When the pressure connector 22 is connected to the detected pipeline, the bottom wall 21a of the detection blind hole 201 will be elastically deformed under the action of the fluid pressure of the detected pipeline.

[0053] like Figures 1 to 4 As shown, in the illustrated embodiment, the force-sensitive component 21 and the pressure joint 22 are a single component formed in one piece. However, the present invention is not limited to the illustrated embodiment. For example, in another exemplary embodiment of the present invention, the force-sensitive component 21 and the pressure joint 22 may be two separate components formed separately and welded together.

[0054] like Figures 1 to 4 As shown, in an exemplary embodiment of the present invention, the end cap 1, the force-sensitive component 21 and the pressure connector 22 can be made of stainless steel, and the seat 30 and the pin 31 of the electrical connector 3 can be made of Kovar alloy.

[0055] like Figures 1 to 4 As shown, in the illustrated embodiment, the pressure detection module also includes a threaded sleeve 23, which is sleeved on the other end of the pressure connector 22 and formed with an external thread 23a for threaded connection with the connecting end of the detected pipeline to connect the pressure connector 22 to the detected pipeline.

[0056] Figure 5 A perspective schematic diagram showing a pressure sensor according to an exemplary embodiment of the present invention.

[0057] like Figures 1 to 5 As shown, in another exemplary embodiment of the present invention, a pressure sensor is also disclosed. The pressure sensor includes: an outer shell 7 and the aforementioned pressure detection module. The pressure detection module is partially installed in the outer shell 7. The end cap 1 of the pressure detection module and one end 220 of the pressure connector 22 are accommodated in the outer shell 7, and the other end of the pressure connector 22 is located outside the outer shell 7 for connecting to the detected pipeline.

[0058] like Figures 1 to 5As shown, in the illustrated embodiment, the outer shell 7 has a first port and a second port axially opposite to each other, and the end cap 1 and one end 220 of the pressure joint 22 are inserted into the first port of the outer shell 7. A welding flange 221 is formed on the outer circumferential surface of the one end 220 of the pressure joint 22, and the outer circumferential surface of the welding flange 221 is welded to the inner circumferential surface of the first port of the outer shell 7.

[0059] like Figures 1 to 5 As shown, in the illustrated embodiment, the pressure sensor further includes: a functional circuit board 93 and an external connector 8. The functional circuit board 93 is accommodated in the outer shell 7 and is electrically connected to the pin 31 of the electrical connector 3, and is used to process the collected pressure signal. The external connector 8 is mounted on the second port of the outer shell 7 and is electrically connected to the functional circuit board 93, and is used to output the processed pressure signal.

[0060] like Figures 1 to 5 As shown, in the illustrated embodiment, the external connector 8 includes: a body 80 and a terminal 81. The body 80 is mounted on the second port of the outer housing 7. The terminal 81 is disposed in the body 80 and is electrically connected to the functional circuit board 93.

[0061] like Figures 1 to 5 As shown, in the illustrated embodiment, the pressure sensor further includes: a first adapter circuit board 91 and a second adapter circuit board 94. The first adapter circuit board 91 is used to electrically connect the pin 31 of the electrical connector 3 to the functional circuit board 93. The second adapter circuit board 94 is used to electrically connect the terminal 81 of the external connector 8 to the functional circuit board 93.

[0062] like Figures 1 to 5 As shown, in the illustrated embodiment, the first adapter circuit board 91 includes: a first rigid circuit board 911 and a first flexible circuit board 912. The first rigid circuit board 911 is electrically connected to the pin 31 of the electrical connector 3. The first flexible circuit board 912 is electrically connected between the first rigid circuit board 911 and the functional circuit board 93.

[0063] like Figures 1 to 5 As shown, in the illustrated embodiment, the second adapter circuit board 94 includes: a second rigid circuit board 941 and a second flexible circuit board 942. The second rigid circuit board 941 is electrically connected to the terminal 81 of the external connector 8. The second flexible circuit board 942 is electrically connected between the second rigid circuit board 941 and the functional circuit board 93.

[0064] like Figures 1 to 5As shown, in the illustrated embodiment, the pressure sensor further includes: a first adapter connector 92 and a second adapter connector 95. The first adapter connector 92 has a first connection terminal 921 electrically connecting the first flexible circuit board 912 and the functional circuit board 93. The second adapter connector 95 has a second connection terminal 951 electrically connecting the second flexible circuit board 942 and the functional circuit board 93.

[0065] like Figures 1 to 5 As shown, in the illustrated embodiment, the pressure sensor further includes a support frame 90 , which is fixed to the end cap 1 and is used to install and hold a functional circuit board 93 .

[0066] Those skilled in the art will appreciate that the embodiments described above are exemplary and may be improved upon by those skilled in the art. The structures described in the various embodiments may be freely combined without causing any conflicts in structure or principle, and these changes should fall within the scope of protection of the present invention.

[0067] Although the present invention has been described in conjunction with the accompanying drawings, the embodiments disclosed in the accompanying drawings are intended to exemplify the preferred implementations of the present invention and should not be construed as limiting the present invention.

[0068] Although some embodiments of the general inventive concept have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the claims and their equivalents.

[0069] It should be noted that the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. In addition, any element reference signs in the claims shall not be construed as limiting the scope of the present invention.

Claims

1. A pressure detection module, characterized in that: include: A pressure connector (22) for connecting to a pipeline to be tested and having a fluid passage (202) for fluid communication with the pipeline to be tested; A force-sensitive component (21) connected to one end (220) of the pressure connector (22) and in fluid communication with the pressure connector (22); A strain gauge, attached to the surface of the force-sensitive component (21), and used to detect the strain of the force-sensitive component (21); An electrical connector (3) comprising a base (30) and a plug pin (31) passing through and fixed to the base (30); An electrical connection plate (6) for electrically connecting the pin (31) to the strain gauge; and The end cap (1) comprises a peripheral wall (10), an end wall (12) and an opening (11) opposite to the end wall (12). The force-sensitive component (21) and the electrical connection plate (6) are accommodated in the inner cavity of the end cap (1), and one end (220) of the pressure connector (22) is welded to the open end of the end cap (1) to seal the opening (11) of the end cap (1). An insertion hole (13) is formed on the end wall (12) of the end cap (1), and the seat body (30) is inserted into the insertion hole (13) and welded to the end wall (12) to seal the insertion hole (13) of the end cap (1).

2. The pressure detection module according to claim 1, characterized in that: A through hole (301) is formed on the base (30) to allow the plug pin (31) to pass through. The plug pin (31) passes through the through hole (301) and is bonded to the base (30) through a glass packaging process, so that the outer peripheral surface of the plug pin (31) and the inner peripheral surface of the through hole (301) are sealed together by sintered glass (32).

3. The pressure detection module according to claim 2, characterized in that: The seat body (30) and the plug pin (31) are made of the same metal material or made of metal materials with the same or similar thermal expansion coefficients; and The thermal expansion coefficients of the seat body (30) and the insertion pin (31) are the same as or close to the thermal expansion coefficient of the glass (32).

4. The pressure detection module according to claim 2, characterized in that: The seat body (30) and the plug pin (31) are made of Kovar alloy.

5. The pressure detection module according to claim 2, characterized in that: A coating is electroplated on the exposed surfaces of the seat body (30) and the plug pin (31); and When electroplating the plating layer, the electrical connector (3) is immersed in the plating solution as a whole, so as to simultaneously form the plating layer on the exposed surfaces of the seat body (30) and the plug pin (31).

6. The pressure detection module according to claim 1, characterized in that: An annular protrusion (14) surrounding the insertion hole (13) is formed on the outer side of the end wall (12) of the end cap (1), and an annular flange (302) is formed on the outer peripheral surface of the seat body (30); The annular flange (302) of the seat body (30) axially abuts against the top surface of the annular protrusion (14) of the end cap (1) and is welded to the top surface of the annular protrusion (14) to seal the insertion hole (13) of the end cap (1).

7. The pressure detection module according to claim 1, characterized in that: The electrical connection plate (6) comprises: A first rigid connecting plate (61) is attached to the outer surface of the force-sensitive component (21) and is electrically connected to the strain gauge; A second rigid connecting plate (62) electrically connected to the pins (31) of the electrical connector (3); and A flexible connection board (63) is electrically connected between the first rigid connection board (61) and the second rigid connection board (62).

8. The pressure detection module according to claim 7, characterized in that: The first rigid connecting plate (61) is adhered to the outer surface of the force-sensitive component (21) by an insulating adhesive (61a); and The first rigid connecting plate (61) and the second rigid connecting plate (62) are spaced apart by a predetermined distance in the axial direction of the end cap (1).

9. The pressure detection module according to claim 1, characterized in that: The force-sensitive component (21) has a blind hole (201) connected to the fluid passage (202) of the pressure connector (22); the bottom wall (21a) of the blind hole (201) constitutes a diaphragm capable of elastic deformation; the strain gauge is attached to the outer surface of the bottom wall (21a) of the blind hole (201) for detecting the strain of the bottom wall (21a) of the blind hole (201).

10. The pressure detection module according to claim 1, characterized in that: The force-sensitive component (21) and the pressure connector (22) are a single component formed in one piece; or The force-sensitive component (21) and the pressure joint (22) are two independent components that are separately formed and welded together.

11. The pressure detection module according to claim 1, characterized in that: The end cap (1), the force-sensitive component (21) and the pressure joint (22) are made of stainless steel, and the seat (30) and the plug pin (31) of the electrical connector (3) are made of Kovar alloy.

12. The pressure detection module according to claim 1, characterized in that: Also includes: A threaded sleeve (23) is sleeved on the other end of the pressure joint (22) and is formed with an external thread (23a) for threaded connection with the connecting end of the detected pipeline, so as to connect the pressure joint (22) to the detected pipeline.

13. A pressure sensor, characterized in that: include: An outer shell (7); and The pressure detection module according to any one of claims 1 to 12 is partially installed in the outer shell (7), The end cap (1) and one end (220) of the pressure connector (22) are accommodated in the outer shell (7), and the other end of the pressure connector (22) is located outside the outer shell (7) for connecting to the pipeline to be tested.

14. The pressure sensor according to claim 13, characterized in that: The outer shell (7) has a first port and a second port axially opposite to each other, and the end cap (1) and one end (220) of the pressure connector (22) are inserted into the first port of the outer shell (7); A welding flange (221) is formed on the outer circumference of one end (220) of the pressure joint (22), and the outer circumference of the welding flange (221) is welded to the inner circumference of the first port of the outer shell (7).

15. The pressure sensor according to claim 14, characterized in that: Also includes: a functional circuit board (93) housed in the outer shell (7) and electrically connected to the pins (31) of the electrical connector (3); and An external connector (8) is mounted on the second port of the outer shell (7) and is electrically connected to the functional circuit board (93).

16. The pressure sensor according to claim 15, characterized in that: The external connector (8) comprises: A body (80) mounted on the second port of the outer shell (7); and A terminal (81) is disposed in the body (80) and is electrically connected to the functional circuit board (93).

17. The pressure sensor according to claim 15, characterized in that: Also includes: A first adapter circuit board (91), used for electrically connecting the pins (31) of the electrical connector (3) to the functional circuit board (93); and The second adapter circuit board (94) is used to electrically connect the terminal (81) of the external connector (8) to the functional circuit board (93).

18. The pressure sensor according to claim 17, characterized in that: The first adapter circuit board (91) comprises: A first rigid circuit board (911) electrically connected to the pins (31) of the electrical connector (3); and The first flexible circuit board (912) is electrically connected between the first rigid circuit board (911) and the functional circuit board (93).

19. The pressure sensor according to claim 18, characterized in that: The second adapter circuit board (94) comprises: A second rigid circuit board (941) electrically connected to the terminal (81) of the external connector (8); and The second flexible circuit board (942) is electrically connected between the second rigid circuit board (941) and the functional circuit board (93).

20. The pressure sensor according to claim 19, characterized in that Also includes: A first transfer connector (92) having a first connection terminal (921) for electrically connecting the first flexible circuit board (912) and the functional circuit board (93); and The second transfer connector (95) has a second connection terminal (951) for electrically connecting the second flexible circuit board (942) and the functional circuit board (93).

21. The pressure sensor according to claim 15, characterized in that Also includes: A support frame (90) is fixed to the end cap (1) and is used to install and hold the functional circuit board (93).

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