Pressure detection module and pressure sensor

Abstract

To provide a pressure sensor that has a simple seal structure, has high reliability, and requires a low cost.SOLUTION: A pressure detection module comprises: a pressure joint 22 that has a fluid path 202 for fluid communication with a detected pipeline; a force sensitive component 21 that is in fluid communication with the pressure joint; strain gauges for detecting strain of the force sensitive component; an electrical connector 3 that includes a seat 30 and a pin 31 fixed to the seat; an electrical connection board 6 for electrically connecting the pin to the strain gauges; and an end cap 1 that includes a peripheral wall 10, an end wall 12, and an opening. The force sensitive component and the electrical connection board are accommodated in an inner cavity of the end cap, and one end 220 of the pressure joint is welded to an open end of the end cap to seal the opening of the end cap. A socket is formed in the end wall of the end cap, and the seat is inserted into the socket and welded to the end wall to seal the socket of the end cap.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit of Chinese Patent Application No. CN202311138678.1, filed with the China National Intellectual Property Office on September 1, 2023, the entire disclosure of which is incorporated herein by reference.

[0002] The present invention relates to a pressure detection module and a pressure sensor including a pressure detection module. [Background technology]

[0003] In the prior art, absolute pressure sensors generally include oil-filled pressure sensors and strain gauge pressure sensors. The oil-filled pressure sensor has a high cost and is prone to oil leakage. The strain gauge pressure sensor requires the strain gauge to be sealed in a closed space. The existing sealing methods of strain gauge pressure sensors are relatively complicated, unreliable and costly. Summary of the Invention [Problem to be solved by the invention]

[0004] SUMMARY OF THE PRESENT EMBODIMENT The present invention is directed to overcoming or alleviating at least one aspect of the above disadvantages. [Means for solving the problem]

[0005] According to an aspect of the present invention, there is provided a pressure sensing module comprising: a pressure fitting for connection to a pipeline to be sensed, the pressure fitting having a flow passage in fluid communication with the pipeline to be sensed; a force sensing component in fluid communication with the pressure fitting connected to one end of the pressure fitting; a strain gauge attached to a surface of the force sensing component for sensing strain on the force sensing component; an electrical connector including a seat and a pin passing through the seat and secured to the seat; an electrical connection board for electrically connecting the pin to the strain gauge; and an end cap including a peripheral wall, an end wall, and an opening opposite the end wall. The force sensing component and the electrical connection board are received in an internal cavity of the end cap, one end of the pressure fitting is welded to the open end of the end cap to seal the opening in the end cap, a socket is formed in the end wall of the end cap, and the seat is inserted into the socket and welded to the end wall to seal the socket in the end cap.

[0006] According to an exemplary embodiment of the present invention, a through hole through which a pin can pass is formed in the seat, and the pin passes through the through hole and is bonded to the seat by a glass sealing process, so that the outer peripheral surface of the pin and the inner peripheral surface of the through hole are sealed to each other by sintered glass.

[0007] According to another exemplary embodiment of the present invention, the seat and the pin are formed from the same metal material or from metal materials having the same or similar thermal expansion coefficient, and the thermal expansion coefficient of the seat and the pin is the same or similar to the thermal expansion coefficient of the glass.

[0008] According to another exemplary embodiment of the present invention, the seat and the pin are formed from Kovar alloy.

[0009] According to another exemplary embodiment of the present invention, a coating is electroplated onto the exposed surfaces of the seat and pins, and as the coating is electroplated, the electrical connector is fully immersed in the electroplating solution to simultaneously form the coating on the exposed surfaces of the seat and pins.

[0010] According to another exemplary embodiment of the present invention, an annular projection surrounding the socket is formed on the outer surface of the end wall of the end cap, and an annular flange is formed on the outer peripheral surface of the seat, and the annular flange of the seat is axially pressed against an upper surface of the annular projection of the end cap and welded to the upper surface of the annular projection to seal the socket of the end cap.

[0011] According to another exemplary embodiment of the present invention, the electrical connection substrate includes a first rigid connection substrate attached to an outer surface of the force sensing component and electrically connected to the strain gauge, a second rigid connection substrate electrically connected to the pin of the electrical connector, and a flexible connection substrate electrically connected between the first rigid connection substrate and the second rigid connection substrate.

[0012] According to another exemplary embodiment of the present invention, the first rigid connection substrate is adhered to an outer surface of the force sensing component by an insulating adhesive, and the first rigid connection substrate and the second rigid connection substrate are spaced apart a predetermined distance in an axial direction of the end cap.

[0013] According to another exemplary embodiment of the present invention, the force sensing component has a blind hole communicating with the flow path of the pressure fitting, a bottom wall of the blind hole forming an elastically deformable membrane, and a strain gauge is attached to an outer surface of the bottom wall of the blind hole to detect strain of the bottom wall of the blind hole.

[0014] According to another exemplary embodiment of the present invention, the force sensing component and the pressure fitting are formed into a single integral component, or the force sensing component and the pressure fitting are two independent components formed separately and welded together.

[0015] According to another exemplary embodiment of the present invention, the end caps, force sensing components, and pressure fittings are formed from stainless steel, and the seats and pins of the electrical connectors are formed from Kovar alloy.

[0016] According to another exemplary embodiment of the present invention, the pressure detection module further comprises a threaded sleeve for connecting the pressure fitting to the pipeline to be detected, the threaded sleeve being attached to the other end of the pressure fitting, the threaded sleeve being formed with male threads for threaded connection to the connection end of the pipeline to be detected.

[0017] According to another aspect of the invention there is provided a pressure sensor comprising a housing and the above-mentioned pressure sensing module partially mounted in the housing, with an end cap and one end of a pressure fitting housed in the housing and the other end of the pressure fitting located outside the housing for connection to a pipeline to be sensed.

[0018] According to an exemplary embodiment of the invention, a housing has axially opposed first and second ports, an end cap and one end of a pressure fitting are inserted into the first port of the housing, a weld flange is formed on an outer surface of the one end of the pressure fitting, and the outer surface of the weld flange is welded to an inner surface of the first port of the housing.

[0019] According to another exemplary embodiment of the present invention, the pressure sensor further comprises a functional circuit board contained in the housing and electrically connected to the pins of the electrical connector, and an external connector mounted to a second port of the housing and electrically connected to the functional circuit board.

[0020] According to another exemplary embodiment of the present invention, an external connector includes a body attached to the second port of the housing, and a terminal provided on the body and electrically connected to the functional circuit board.

[0021] According to another exemplary embodiment of the present invention, the pressure sensor further comprises a first adapter circuit board used to electrically connect pins of the electrical connector to the functional circuit board, and a second adapter circuit board used to electrically connect terminals of the external connector to the functional circuit board.

[0022] 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.

[0023] According to another exemplary embodiment of the present invention, the second adapter circuit board includes a second rigid circuit board electrically connected to a terminal of the external connector, and a second flexible circuit board electrically connected between the second rigid circuit board and the functional circuit board.

[0024] According to another exemplary embodiment of the present invention, the pressure sensor further includes a first adapter connector having a first connection terminal electrically connected to the first flexible circuit board and the functional circuit board, and a second adapter connector having a second connection terminal electrically connected to the second flexible circuit board and the functional circuit board.

[0025] In accordance with another exemplary embodiment of the present invention, the pressure sensor further comprises a support frame secured to the end cap for mounting and maintaining the functional circuit board.

[0026] In the above exemplary embodiment of the present invention, the opening and socket of the end cap are sealed by the pressure fitting and the electrical connector, respectively, and thus the force sensing component and the strain gauge are sealed in the internal cavity of the end cap. Furthermore, the sealing structure of the present invention is simple, has high sealing reliability, and is low cost.

[0027] In some exemplary embodiments of the present invention, the electrical connection substrate that is electrically connected to the pins of the electrical connector is flexible so as not to stress the pins and not to damage the seal between the pins and the seats of the electrical connector, thereby improving the reliability of the seal.

[0028] In some exemplary embodiments according to the present invention, the end caps are welded to the ends of the pressure fittings rather than being welded directly to the force sensing components, thereby avoiding adverse effects on the force sensing components and improving pressure detection accuracy.

[0029] In some exemplary embodiments according to the present invention, in order to preserve the size of the end cap, the seat of the electrical connector is welded to the end cap rather than bonded to the end cap by a glass sealing process, ensuring the stability of the size of the end cap and further improving the sealing performance.

[0030] In some exemplary embodiments of the present invention, the electroplating process can be simplified by immersing the entire electrical connector in an electroplating solution and electroplating the coating onto the exposed surfaces of the sockets and pins of the electrical connector at once, eliminating the need to electroplate multiple pins and sockets separately.

[0031] These and other features of the present invention will become more apparent from the detailed description of illustrative embodiments taken in conjunction with the accompanying drawings. [Brief description of the drawings]

[0032] [Figure 1] 2 is a three-dimensional cross-sectional view of a pressure sensing module according to an exemplary embodiment of the present invention. [Diagram 2] FIG. 2 is an illustration of an exploded view of a pressure sensing module in accordance with an exemplary embodiment of the present invention. [Diagram 3] FIG. 2 is a diagrammatic perspective view of an end cap portion of a pressure sensing module according to an exemplary embodiment of the present invention. [Figure 4] 2 is an illustration of an exploded view of an end cap portion of a pressure sensing module in accordance with an exemplary embodiment of the present invention. [Diagram 5] 1 is an illustrative perspective view of a pressure sensor in accordance with an exemplary embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0033] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals refer to the same elements. However, the present disclosure may be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the disclosure to those skilled in the art.

[0034] In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, it will be apparent that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are diagrammatically shown in order to simplify the drawings.

[0035] According to a general aspect of the present invention, there is provided a pressure sensing module, comprising: a pressure fitting for connection to a pipeline to be sensed, the pressure fitting having a flow passage in fluid communication with the pipeline to be sensed; a force sensing component connected to one end of the pressure fitting and in fluid communication with the pressure fitting; a strain gauge attached to a surface of the force sensing component for sensing strain in the force sensing component; an electrical connector including a seat and a pin passing through the seat and secured to the seat; an electrical connection board for electrically connecting the pin to the strain gauge; and an end cap including a peripheral wall, an end wall, and an opening opposite the end wall, the force sensing component and the electrical connection board being received in an internal cavity of the end cap, one end of the pressure fitting being welded to the open end of the end cap to seal the opening in the end cap, a socket being formed in the end wall of the end cap, the seat being inserted into the socket and welded to the end wall to seal the socket in the end cap.

[0036] According to another general aspect of the present invention there is provided a pressure sensor comprising a housing and a pressure sensing module as described above partially mounted in the housing, with an end cap and one end of a pressure fitting housed in the housing and the other end of the pressure fitting disposed outside the housing for connection to a pipeline to be sensed.

[0037] Figure 1 is a three-dimensional cross-sectional view of a pressure sensing module according to an exemplary embodiment of the present invention. Figure 2 is an illustrative exploded view of a pressure sensing module according to an exemplary embodiment of the present invention. Figure 3 is an illustrative perspective view of an end cap portion of a pressure sensing module according to an exemplary embodiment of the present invention. Figure 4 is an illustrative exploded view of an end cap portion of a pressure sensing module according to an exemplary embodiment of the present invention.

[0038] As shown in Figs. 1 to 4, 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 sensing 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 a customer's pipeline (not shown) to be detected, and has a flow path 202 that is fluidly connected to the pipeline to be detected. The force sensing component 21 is connected to one end 220 of the pressure joint 22 and is fluidly connected to the pressure joint 22. The strain gauge is attached to a surface of the force sensing component 21 to detect the strain (i.e., elastic deformation) of the force sensing component 21. The electrical connector 3 includes a seat 30 and a pin 31 that penetrates the seat 30 and is fixed to the seat 30. The electrical connection board 6 is used to 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 the end wall 12.

[0039] 1-4 , in the illustrated embodiment, the force sensing component 21 and the electrical connection board 6 are received in an internal cavity of the end cap 1, and one end 220 of the pressure fitting 22 is welded to the open end of the end cap 1 to seal the opening 11 in the end cap 1. A socket 13 is formed in an end wall 12 of the end cap 1, and a seat 30 is inserted into the socket 13 and welded to the end wall 12 to seal the socket 13 in the end cap 1.

[0040] 1-4, in the illustrated embodiment, the opening 11 and socket 13 of the end cap 1 are sealed by the pressure fitting 22 and the electrical connector 3, respectively, and thus both the force sensing component 21 and the strain gauge are sealed in the internal cavity of the end cap 1. Furthermore, the sealing structure of the present invention is simple, has high sealing reliability, and is low cost.

[0041] As shown in Figures 1-4, in the illustrated embodiment, the end cap 1 is welded to the end 220 of the pressure fitting 22 rather than directly welded to the force sensing component 21, thereby avoiding adverse effects on the force sensing component 21 and improving pressure detection accuracy.

[0042] 1 to 4, in the illustrated embodiment, a through hole 301 through which the pin 31 can pass is formed in the seat 30. The pin 31 passes through the through hole 301 and is bonded to the seat 30 by a glass sealing process, so that the outer peripheral surface of the pin 31 and the inner peripheral surface of the through hole 301 are firmly bonded to each other by the sintered glass 32.

[0043] As shown in Figures 1-4, in the illustrated embodiment, the seat 30 and the pin 31 are made of the same metal material or of metal materials having the same or similar thermal expansion coefficients. The thermal expansion coefficients of the seat 30 and the pin 31 are the same or similar to that of the glass 32. In this way, a gap between the seat 30 and the pin 31 during thermal expansion and contraction can be effectively prevented, and the reliability of the seal between the seat 30 and the pin 31 is improved.

[0044] 1-4, in an exemplary embodiment of the present invention, the seat 30 and the pin 31 may be made of Kovar alloy, since the thermal expansion coefficient of Kovar alloy is very close to that of the glass 32. However, the present invention is not limited to the illustrated embodiment, and the seat 30 and the pin 31 may be made of other suitable metallic materials.

[0045] 1-4, in the illustrated embodiment, a coating (not shown) is electroplated onto the exposed surfaces of the seat 30 and the pins 31. When electroplating the coating, the electrical connector 3 is fully immersed in an electroplating solution to simultaneously form a coating on the exposed surfaces of the seat 30 and the pins 31. Thus, the present invention eliminates the need to electroplate multiple pins 31 and seats 30 separately, simplifying the electroplating process.

[0046] 1 to 4, in the illustrated embodiment, an annular projection 14 surrounding the socket 13 is formed on the outer surface of the end wall 12 of the end cap 1, and an annular flange 302 is formed on the outer circumferential surface of the seat 30. The annular flange 302 of the seat 30 is axially pressed against the upper surface of the annular projection 14 of the end cap 1 and welded to the upper surface of the annular projection 14 to seal the socket 13 of the end cap 1.

[0047] As shown in FIGS. 1-4, 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 sensing 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, due to the flexibility of the flexible connection board 63, the pin 31 is not stressed, and therefore the pin 31 does not move relative to the seat 30, thereby not damaging the seal between the pin 31 of the electrical connector 3 and the seat 30, improving the reliability of the seal.

[0048] 1-4, in the illustrated embodiment, the first rigid connection board 61 is adhered to an outer surface of the force sensing component 21 by an insulating adhesive 61a. The first rigid connection board 61 and the second rigid connection board 62 are spaced apart from each other by a predetermined distance in the axial direction of the end cap 1.

[0049] 1 to 4, in the illustrated embodiment, the force sensing component 21 has a blind hole 201 communicating with a flow passage 202 of a pressure fitting 22. A bottom wall 21a of the blind hole 201 forms an elastically deformable membrane, and a strain gauge is attached to an outer surface of the bottom wall 21a of the blind hole 201 to detect strain of the bottom wall 21a of the blind hole 201. When the pressure fitting 22 is connected to a pipeline to be detected, the bottom wall 21a of the blind hole 201 is elastically deformed by the fluid pressure of the pipeline to be detected.

[0050] 1-4, in the illustrated embodiment, the force sensing component 21 and the pressure fitting 22 are formed as a single component. However, the present invention is not limited to the illustrated embodiment. For example, in another exemplary embodiment of the present invention, the force sensing component 21 and the pressure fitting 22 may be two independent components that are formed separately and welded together.

[0051] As shown in FIGS. 1-4, in an exemplary embodiment of the invention, the end cap 1, force sensing component 21, and pressure fitting 22 may be formed from stainless steel, and the seat 30 and pin 31 of the electrical connector 3 may be formed from Kovar alloy.

[0052] As shown in Figures 1 to 4, in the illustrated embodiment, the pressure detection module further includes a threaded sleeve 23 for connecting the pressure fitting 22 to the pipeline to be detected, the threaded sleeve 23 is fitted onto the other end of the pressure fitting 22, and the threaded sleeve 23 is formed with a male thread 23a for threaded connection to the connection end of the pipeline to be detected.

[0053] FIG. 5 is an illustrative perspective view of a pressure sensor according to an exemplary embodiment of the invention.

[0054] As shown in Figures 1 to 5, in another exemplary embodiment of the present invention, a pressure sensor is also disclosed. The pressure sensor includes a housing 7 and the above-mentioned pressure detection module. The pressure detection module is partially mounted in the housing 7. An end cap 1 of the pressure detection module and one end 220 of a pressure fitting 22 are housed in the housing 7, and the other end of the pressure fitting 22 is disposed outside the housing 7 for connection to a pipeline to be detected.

[0055] 1-5, in the illustrated embodiment, the housing 7 has a first port and a second port axially opposed to each other, and the end cap 1 and one end 220 of the pressure fitting 22 are inserted into the first port of the housing 7. A weld flange 221 is formed on the outer surface of the one end 220 of the pressure fitting 22, and the outer surface of the weld flange 221 is welded to the inner surface of the first port of the housing 7.

[0056] 1 to 5, 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 housing 7 and is electrically connected to the pin 31 of the electrical connector 3 for processing the collected pressure signal. The external connector 8 is attached to a second port of the housing 7 and is electrically connected to the functional circuit board 93 for outputting the processed pressure signal.

[0057] 1 to 5, in the illustrated embodiment, the external connector 8 includes a main body 80 and a terminal 81. The main body 80 is attached to the second port of the housing 7. The terminal 81 is provided on the main body 80 and is electrically connected to a functional circuit board 93.

[0058] 1 to 5, 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 connect the pins 31 of the electrical connector 3 to the functional circuit board 93. The second adapter circuit board 94 is used to electrically connect the terminals 81 of the external connector 8 to the functional circuit board 93.

[0059] 1 to 5, 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 pins 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.

[0060] 1 to 5, 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 a 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.

[0061] 1 to 5, in the illustrated embodiment, the pressure sensor further includes a first adaptor connector 92 and a second adaptor connector 95. The first adaptor connector 92 has a first connection terminal 921 electrically connected to the first flexible circuit board 912 and the functional circuit board 93. The second adaptor connector 95 has a second connection terminal 951 electrically connected to the second flexible circuit board 942 and the functional circuit board 93.

[0062] As shown in FIGS. 1-5, in the illustrated embodiment, the pressure sensor further comprises a support frame 90 fixed to the end cap 1 for mounting and maintaining a functional circuit board 93. As shown in FIG.

[0063] It should be understood by those skilled in the art that the above embodiments are illustrative and not restrictive. For example, those skilled in the art can make many modifications to the above embodiments without any contradiction in structure or principle, and can freely combine various features described in different embodiments with each other.

[0064] While several exemplary embodiments have been shown and described, it will be understood by those skilled in the art that various changes or modifications can be made to these embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined by the following claims and their equivalents.

[0065] As used herein, elements described in the singular and preceded by the word "a" or "an" should be understood as not excluding a plurality of said elements or steps, unless expressly stated to the contrary. Furthermore, references to "one embodiment" of the invention are not intended to be interpreted as excluding the existence of additional embodiments that also incorporate the recited features. Furthermore, unless expressly stated otherwise, embodiments "comprising" or "having" an element or elements having a particular characteristic can include additional such elements that do not have that characteristic.

Claims

1. A pressure sensing module, comprising: a pressure fitting (22) for connection to a pipeline to be detected, the pressure fitting (22) having a flow path (202) in fluid communication with the pipeline to be detected; a force sensing component (21) connected to one end (220) of the pressure fitting (22) and in fluid communication with the pressure fitting (22); a strain gauge attached to a surface of the force sensing component (21) for detecting a strain of the force sensing component (21); an electrical connector (3) including a seat (30) and a pin (31) passing through the seat (30) and fixed to the seat (30); an electrical connection board (6) for electrically connecting the pin (31) to the strain gauge; an end cap (1) including a peripheral wall (10), an end wall (12), and an opening (11) opposite said end wall (12); the force sensing component (21) and the electrical connection board (6) are housed in an internal cavity of the end cap (1), and one end (220) of the pressure fitting (22) is welded to an open end of the end cap (1) to seal the opening (11) of the end cap (1); A pressure sensing module, wherein a socket (13) is formed in the end wall (12) of the end cap (1), and the seat (30) is inserted into the socket (13) and welded to the end wall (12) to seal the socket (13) in the end cap (1).

2. 2. The pressure detection module of claim 1, wherein a through hole (301) through which the pin (31) can pass is formed in the seat (30), and the pin (31) passes through the through hole (301) and is joined to the seat (30) by a glass sealing process, and thus the outer peripheral surface of the pin (31) and the inner peripheral surface of the through hole (301) are sealed to each other by sintered glass (32).

3. said seat (30) and said pin (31) are made from the same metallic material or from metallic materials having the same or similar thermal expansion coefficients; 3. The pressure sensing module of claim 2, wherein the coefficient of thermal expansion of the seat (30) and the pin (31) is the same or similar to the coefficient of thermal expansion of the glass (32).

4. 3. The pressure sensing module of claim 2, wherein said seat (30) and said pin (31) are made of Kovar alloy.

5. The exposed surfaces of the seat (30) and the pin (31) are electroplated with a coating; 3. The pressure detection module of claim 2, wherein when electroplating the coating, the electrical connector (3) is fully immersed in an electroplating solution to simultaneously form the coating on the exposed surfaces of the seat (30) and the pin (31).

6. An annular projection (14) surrounding the socket (13) is formed on the outer surface of the end wall (12) of the end cap (1), and an annular flange (302) is formed on the outer circumferential surface of the seat (30); 2. The pressure detection module of claim 1, wherein the annular flange (302) of the seat (30) is axially pressed against an upper surface of the annular projection (14) of the end cap (1) and welded to the upper surface of the annular projection (14) to seal the socket (13) of the end cap (1).

7. The electrical connection board (6) is a first rigid connection board (61) attached to an outer surface of the force sensing component (21) and electrically connected to the strain gauges; a second rigid connection board (62) electrically connected to the pins (31) of the electrical connector (3); 2. The pressure detection module according to claim 1, further comprising a flexible connection board (63) electrically connected between the first rigid connection board (61) and the second rigid connection board (62).

8. The first rigid connection substrate (61) is adhered to an outer surface of the force sensing component (21) by an insulating adhesive (61a); 8. The pressure detection module according to claim 7, wherein the first rigid connection board (61) and the second rigid connection board (62) are spaced apart by a predetermined distance in the axial direction of the end cap (1).

9. 2. The pressure detection module of claim 1, wherein the force sensing component (21) has a blind hole (201) communicating with the flow path (202) of the pressure fitting (22), a bottom wall (21a) of the blind hole (201) forms an elastically deformable membrane, and the strain gauge is attached to an outer surface of the bottom wall (21a) of the blind hole (201) to detect a strain of the bottom wall (21a) of the blind hole (201).

10. The force sensing component (21) and the pressure coupling (22) are formed in a single integral component, or 2. The pressure sensing module of claim 1, wherein the force sensing component (21) and the pressure joint (22) are two independent components formed separately and welded together.

11. 2. The pressure detection module of claim 1, wherein the end cap (1), the force sensing component (21), and the pressure fitting (22) are formed from stainless steel, and the seat (30) and the pin (31) of the electrical connector (3) are formed from Kovar alloy.

12. 2. The pressure detection module of claim 1, further comprising a threaded sleeve (23) for connecting the pressure fitting (22) to the pipeline to be detected, the threaded sleeve (23) being attached to the other end of the pressure fitting (22), and the threaded sleeve (23) being formed with a male thread (23a) for threaded connection to a connection end of the pipeline to be detected.

13. 1. A pressure sensor comprising: A housing (7); The pressure detection module according to any one of claims 1 to 12, partially mounted in the housing (7); Equipped with A pressure sensor, wherein the end cap (1) and one end (220) of the pressure fitting (22) are housed in the housing (7), and the other end of the pressure fitting (22) is positioned outside the housing (7) for connection to the pipeline to be detected.

14. the housing (7) has axially opposed first and second ports, the end cap (1) and one end (220) of the pressure fitting (22) being inserted into the first port of the housing (7); 14. The pressure sensor of claim 13, wherein a weld flange (221) is formed on an outer surface of one end (220) of the pressure fitting (22), and the outer surface of the weld flange (221) is welded to an inner surface of the first port of the housing (7).

15. a functional circuit board (93) accommodated in the housing (7) and electrically connected to the pins (31) of the electrical connector (3); an external connector (8) that is mounted on the second port of the housing (7) and electrically connected to the functional circuit board (93); The pressure sensor of claim 14 further comprising:

16. The external connector (8) a body (80) attached to the second port of the housing (7); A terminal (81) provided on the main body (80) and electrically connected to the functional circuit board (93); The pressure sensor of claim 15 , comprising:

17. a first adapter circuit board (91) used to electrically connect the pins (31) of the electrical connector (3) to the functional circuit board (93); a second adapter circuit board (94) used to electrically connect the terminals (81) of the external connector (8) to the functional circuit board (93); The pressure sensor of claim 15 further comprising:

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

19. The second adaptor circuit board (94) comprises: a second rigid circuit board (941) electrically connected to the terminal (81) of the external connector (8); a second flexible circuit board (942) electrically connected between the second rigid circuit board (941) and the functional circuit board (93); 20. The pressure sensor of claim 18, comprising:

20. a first adapter connector (92) having a first connection terminal (921) electrically connected to the first flexible circuit board (912) and the functional circuit board (93); a second adapter connector (95) having a second connection terminal (951) electrically connected to the second flexible circuit board (942) and the functional circuit board (93); 20. The pressure sensor of claim 19 further comprising:

21. 16. The pressure sensor of claim 15, further comprising a support frame (90) secured to said end cap (1) for mounting and maintaining said functional circuit board (93).

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