pressure transmitter

Abstract

The application discloses a pressure transmitter, which comprises a base part, a plug-in interface assembly and a shell, the base part comprises an upper end surface and a positioning recess, the positioning recess is located at the edge of the base part and is recessed downward relative to the upper end surface; the plug-in interface assembly comprises a plug-in part, the positioning recess cooperates with the plug-in part to limit the rotation of the plug-in interface assembly relative to the base part; the shell comprises a limiting convex part, the shell is welded and fixed with the base part, the limiting convex part protrudes inward relative to the inner wall surface of the shell, and the limiting convex part limits the axial displacement of the plug-in interface assembly; the application further comprises a filling material, and the base part, the shell and the plug-in interface assembly are sealed by the filling material. The application prevents the plug-in interface assembly from coming off by circumferential rotation prevention and axial limiting, and reduces the matching strength requirement of the plug-in interface assembly; meanwhile, the filling of the filling material ensures the waterproof performance of the whole pressure transmitter.

Description

Technical Field

[0001] This invention relates to the field of pressure control components, and in particular to a pressure transmitter. Background Technology

[0002] The pressure transmitter in the background technology includes a housing 01 and a connector 02. The housing 01 is riveted to fix the connector 02 by a riveting part 03. The riveting method requires the connector 02 to have a high load-bearing capacity. At the same time, the riveting position 03 is located at the upper end of the housing 01, forming a large internal space 04 between the housing 01 and the connector 02. The internal space 04 does not have protective measures, and the pressure transmitter has poor waterproof performance. Summary of the Invention

[0003] To address the problems in the background art, the present invention discloses a pressure transmitter, including a base component, a connector assembly, and a housing. The base component includes an upper end face and a positioning recess, the positioning recess being located at the edge of the base component and recessed downward relative to the upper end face. The connector assembly includes a plug-in portion, the positioning recess cooperating with the plug-in portion to restrict rotation of the connector assembly relative to the base component. The housing includes a limiting protrusion, the housing being welded and fixed to the base component, the limiting protrusion protruding inward relative to the inner wall surface of the housing, the limiting protrusion restricting axial displacement of the connector assembly.

[0004] It also includes a potting material, through which the base component, the housing, and the connector assembly are sealed.

[0005] This invention prevents the connector assembly from coming off by circumferentially preventing rotation and axially limiting it, thus reducing the strength requirements for the connector assembly; at the same time, it ensures the overall waterproof protection performance of the pressure transmitter by filling and potting material. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of the background technology in this invention;

[0007] Figure 2 This is a schematic diagram of the pressure transmitter in this invention;

[0008] Figure 3 This is a cross-sectional schematic diagram of the pressure transmitter in this invention;

[0009] Figure 4 for Figure 3 A magnified view of a portion of position II;

[0010] Figure 5 for Figure 3 A magnified view of a portion of position III;

[0011] Figure 6 This is a schematic diagram of the structure of the interface component and the base component in this invention;

[0012] Figure 7 This is a schematic diagram of the structure of the interface assembly, base assembly, and circuit elements in this invention;

[0013] Figure 8 This is a schematic diagram of the base component in this invention;

[0014] Figure 9 This is a top view of the base component in this invention.

[0015] In the picture:

[0016] 01. Housing; 02. Connector; 03. Riveting part; 04. Internal space;

[0017] 1. Base component; 10. Mounting hole; 101. Upper end face; 1010. Positioning recess; 1011. Upper positioning step; 102. Lower end face; 1021. Lower positioning step; 1022. Connecting end; 103. Limiting plate; 104. Flow hole;

[0018] 2. Plug-in assembly; 21. Port section; 22. Plug-in section; 221. Support foot; 2210. Abutment surface; 222. Boss; 223. Communication port; 23. Spacing gap; 24. Shoulder; 25. Pin; 26. Installation gap;

[0019] 3. Glass sealing assembly; 31. Diaphragm; 32. Pressure sensing chamber; 33. Pressure sensing element; 34. Pin;

[0020] 4. Oil filling channel; 40. Oil filling port; 41. Steel ball; 42. Silicone oil;

[0021] 5. Circuit components; 51. Circuit board;

[0022] 6. Housing; 61. Welded end; 62. Limiting protrusion;

[0023] 7. Air inlet assembly; 71. Connecting plate; 72. Inlet seat; 73. Air inlet chamber; 8. Potting material. Detailed Implementation

[0024] The present invention will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them.

[0025] In the accompanying drawings, shapes and dimensions may be enlarged for clarity, and the same reference numerals will be used in all figures to indicate the same or similar parts.

[0026] In the following description, terms such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, and lower are defined relative to the structure shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other orientations should not be interpreted as restrictive terms.

[0027] Terms involving attachment, connection, etc., refer to the relationship in which these structures are fixed or restrained by direct connection to each other or by indirect connection through intermediate structures, as well as movable or rigid attachment, unless otherwise clearly stated.

[0028] To achieve the above-mentioned objectives and other advantages of the present invention, the present invention provides the following technical solutions:

[0029] This invention provides a pressure transmitter, such as Figures 2 to 9 The diagram shows a base component 1 and a connector assembly 2. The pressure transmitter has a pressure sensing chamber 32. The base component 1 includes an oil filling channel 4 that communicates with the pressure sensing chamber 32. The oil filling port 40 of the oil filling channel 4 is located on the upper end face 101 of the base component 1. The base component 1 includes a positioning recess 1010 located on the edge of the base component 1 and recessed downward relative to the upper end face 101. There is a predetermined distance between the oil filling port 40 and the positioning recess 1010. The connector assembly 2 includes a plug-in portion 22. The positioning recess 1010 cooperates with the plug-in portion 22 and limits the circumferential rotation of the connector assembly 2 relative to the base component 1.

[0030] Specifically, the pressure transmitter includes a diaphragm 31, and a base component 1 is welded and fixed to the diaphragm 31. A pressure-sensing chamber 32 is located between the base component 1 and the diaphragm 31, and the pressure-sensing chamber 32 is filled with silicone oil 42. After the pressure transmitter fills the pressure-sensing chamber 32 with silicone oil 42 through the oil filling channel 4, the oil filling port 40 is generally sealed by welding a seal. To improve production efficiency, the seal is generally welded and fixed to the base component 1 in an automatic welding machine. The automatic welding machine uses a CCD (charge-coupled device) to identify the position of the oil filling port 40. However, when there is silicone oil 42 residue on the base component 1, the reflection of the oil film will interfere with the CCD imaging, hindering the accurate positioning of the oil filling port 40. The pressure transmitter of this invention features a downwardly recessed positioning recess 1010 along the edge of the upper end face 101 of the base component 1. During the machining of the oil filling channel 4, a predetermined distance is set between the oil filling port 40 and the positioning recess 1010, facilitating accurate positioning of the oil filling port during subsequent sealing welding. The positioning recess 1010 has a notch along the edge of the upper end face 101, giving it an easily identifiable shape for CCD image recognition and positioning during welding. Furthermore, the positioning recess 1010 is formed by milling the outer side wall of the base component 1. The milled edge can be a straight edge or a groove, making the outer contour of the positioning recess 1010 clearly distinguishable from other parts of the outer contour of the upper end face 101 of the base component 1. In this invention, the positioning recess 1010 is provided on the edge of the upper end face 101 of the base component 1 and is recessed relative to the upper end face 101. A notch is formed on the edge of the upper end face 101, so that the positioning recess 1010 has an easily identifiable shape feature, which facilitates the positioning of the oil filling hole 40 based on the positioning recess 1010.

[0031] Furthermore, in one embodiment, such as Figure 9 As shown, a predetermined distance H is defined, which can be considered as the distance between the milled edge and the oil filling hole 40. Of course, this distance is not limited to a straight line; the oil filling hole 40 can be angled to the positioning recess 1010, and the predetermined distance H can be present in the angular direction. Furthermore, the milled groove or milled edge can be selected as a regular shape. For example, when the upper end face 101 of the base component 1 is circular, the milled edge is machined as a straight line perpendicular to the radius of the circle, and the starting point of the predetermined distance H is defined by the intersection of the milled edge and the radius; when milling a groove, it is machined as an arc, and the starting point of the predetermined distance H is defined by the center of the arc, etc.

[0032] Furthermore, such as Figure 3 , Figure 5 , Figure 6 , Figure 7As shown, the connector assembly 2 includes a port portion 21 and a plug portion 22. The plug portion 22 is disposed around the port portion 21 and protrudes downward relative to the port portion 21. The positioning recess 1010 engages with the plug portion 22 in the connector assembly 2 and limits the circumferential rotation of the connector assembly 2, facilitating the positioning and assembly of the connector assembly 2 with the base component 1. Specifically, the plug portion 22 includes a support leg 221 and a boss 222. The lower end of the support leg 221 has an abutment surface 2210, and the boss 222 protrudes downward relative to the abutment surface 2210. The abutment surface 2210 contacts the upper end surface 101 of the base component 1, and the boss 222 engages with the positioning recess 1010. The pressure transmitter also includes a circuit element 5, and a mounting space exists between the port portion 21 and the base component 1, within which the circuit element 5 is installed.

[0033] Furthermore, there are three legs 221, which are evenly distributed around the circumference of the connector assembly 2, and at least one of the three legs 221 includes a boss 222, with the positioning recess 1010 corresponding to the boss 222. The three legs 221 help to save material, and the following gap 23 is formed between adjacent legs 221.

[0034] like Figure 3 , Figure 7 , Figure 8 , Figure 9 As shown, the pressure transmitter also includes a glass seal assembly 3 and a pressure sensing element 33. The base component 1 includes a mounting hole 10, which is located at the radial center of the base component 1 and extends axially through the base component 1. The glass seal assembly 3 is accommodated in the mounting hole 10 and fixedly connected to the hole wall of the mounting hole 10. The pressure sensing element 33 is fixed to the lower end face 102 of the glass seal assembly 3 by adhesive bonding. The positioning recess 1010 and the oil filling port 40 are located on both sides of the mounting hole 10, which helps to make full use of the space of the base component 1 and avoid structural interference. The glass seal assembly 3 includes pins 34, and the interface assembly 2 includes pins 25. The pins 34, circuit element 5, and pins 25 are positioned correspondingly, and the pressure sensing element 33, pins 34, circuit element 5, and pins 25 are electrically connected. To ensure stable connection, the relative positions of the interface assembly 2, circuit element 5, and glass seal assembly 3 must be kept fixed during the installation of the pressure transmitter. The interface component 2 is limited and connected to the positioning recess 1010 by the boss 222 to prevent relative rotation from causing positioning offset with other components.

[0035] Specifically, such as Figure 2 , Figure 3As shown, the pressure transmitter also includes an air inlet assembly 7, which includes a connecting plate 71 and an inlet seat 72. The lower end of the connecting plate 71 is welded and fixed to the upper end of the inlet seat 72. The lower end face 102 of the base component 1 includes a lower positioning step 1021, and the upper end of the connecting plate 71 is welded and fixed to the lower positioning step 1021. Furthermore, a diaphragm 31 is fixed to the base component 1. The lower end face of the base component 1 also includes a connecting end 1022, which is arranged around the periphery of the mounting hole 10. The diaphragm 31 is fixed to the connecting end 1022. Specifically, the fixing method involves welding a limiting plate 103 to the connecting end 1022. The limiting plate 103 has a flow hole 104, and the diaphragm 31 is sandwiched between the limiting plate 103 and the connecting end 1022. The limiting plate 103 can limit the maximum deformation of the diaphragm 31. The diaphragm 31 divides the space between the base component 1 and the air inlet assembly 7 into a pressure-sensing chamber 32 and an air inlet chamber 73 that are not connected to each other. The pressure-sensing chamber 32 is located between the base component 1 and the diaphragm 31, and the pressure-sensing element 33 is located in the pressure-sensing chamber 32.

[0036] During the pressure transmitter assembly process, the pressure sensing element 33, the glass sealing assembly 3, and the pin 34 are first fixedly connected. Then, the glass sealing assembly 3 is fixed in the mounting hole 10 in the base component 1. The diaphragm 31 is then fixed to the base component 1. Finally, silicone oil 42 is filled into the pressure sensing chamber 32 through the oil filling channel 4. After the silicone oil 42 is filled, the automatic welding equipment positions the oil filling port 40 through the positioning recess 1010 and seals the oil filling port 40 by welding the sealing element to the wall of the oil filling port 40. More specifically, the oil filling port 40 is circular, and the sealing element is a steel ball 41. The steel ball 41 seals the oil filling port 40, and at least part of the steel ball 41 is located inside the oil filling port 40 and welded to the oil filling port 40.

[0037] Furthermore, the pins 34 of the exposed glass seal assembly 3 are connected and fixed to the circuit element 5. The circuit element 5 is further connected to the pins 25 in the interface assembly 2. The pins 25 pass through the connection position between the port portion 21 and the plug portion 22, and connect to the external circuit to form a complete pressure-electrical signal path. Specifically, the circuit element 5 includes a circuit board 51. Therefore, the relative positions of the glass seal assembly 3, the circuit board 51, and the pins 25 must remain unchanged during the assembly of the pressure transmitter to ensure the normal function of the pressure transmitter.

[0038] Furthermore, such as Figure 3 , Figure 4 As shown, the pressure transmitter also includes a housing 6, which includes a limiting protrusion 62. The housing 6 is welded and fixed to the base component 1. The limiting protrusion 62 protrudes inward relative to the inner wall surface of the housing 6 and axially limits the insertion interface assembly 2.

[0039] In one embodiment, such as Figure 3 , Figure 5As shown, the base component 1 includes an upper positioning step 1011, which is recessed downward relative to the upper end face 101. The lower end of the housing 6 serves as a welding end 61 and is welded and fixed to the stepped portion of the upper positioning step 1011. The positioning recess 1010 extends downward to the positioning step 1011. The connector assembly 2 is made of plastic and includes a shoulder 24. The housing 6 is a thin-walled cylindrical part made of stainless steel. The limiting protrusion 62 is formed by dotting and abuts against the shoulder 24 to limit the upward displacement of the connector assembly 2 along the axial direction of the pressure transmitter. The base component 1, housing 6, circuit element 5, and connector assembly 2 are sealed with potting material 8.

[0040] Specifically, the shoulder 24 of the connector assembly 2 is the upper end face 101 of the support leg 221. During assembly, the limiting protrusion on the inner wall of the housing 6 pre-positions the support leg 221 against the upper end face 101 to prevent the connector assembly 2 from axially displacing upward and coming out of the housing 6. The potting material 8 enters the housing 6 and the interior of the connector assembly 2 through the gap 23 between the three supports 221 and fills the entire installation space.

[0041] Furthermore, Figure 3 , Figure 4 , Figure 6 , Figure 7 As shown, the housing 6 is fitted onto the support leg 221, and a gap 26 exists between the outer wall of the support leg 221 and the inner wall of the housing 6. The support leg 221 also includes a connecting port 223, which connects the gap 26 between the support leg 221 and the housing 6, as well as the mounting space inside the support leg 221. Further, the connecting port 223 is a through hole or through groove penetrating the inner and outer walls of the support leg 221. Through the structural design of the upper positioning step 1011 and the lower positioning step 1021, the housing 6 is welded and fixed to the stepped portion of the upper positioning step 1011, the inner wall of the housing 6 and the outer wall of the support leg 221 have a gap 26 for the flow of potting material 8, and the air inlet assembly 7 is welded and fixed to the stepped portion of the lower positioning step 1021. This reduces the size of the pressure transmitter in the radial direction, optimizes the product structure, and facilitates product miniaturization and reduces manufacturing costs. Furthermore, the potting material 8 in the installation space can enter the gap 26 between the outer wall of the support 221 and the inner wall of the housing 6 through the connecting port 223 from the middle of the support 221, ensuring that the potting material 8 fully fills the internal space of the housing 6 and pots the gap between the circuit board 51, the pin 34, and the pin 25.

[0042] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A pressure transmitter, characterized in that, The device includes a base component (1), a connector assembly (2), and a housing (6). The base component (1) includes an upper end face (101) and a positioning recess (1010). The positioning recess (1010) is located at the edge of the base component (1) and is recessed downward relative to the upper end face (101). The connector assembly (2) includes a plug-in portion (22). The positioning recess (1010) cooperates with the plug-in portion (22) to restrict the rotation of the connector assembly (2) relative to the base component (1). The housing (6) includes a limiting protrusion (62). The housing (6) is welded and fixed to the base component (1). The limiting protrusion (62) protrudes inward relative to the inner wall surface of the housing (6) and restricts the axial displacement of the connector assembly (2). It also includes a potting material (8), through which the base component (1), the housing (6) and the connector assembly (2) are sealed.

2. The pressure transmitter as described in claim 1, characterized in that, The insertion part (22) includes a support leg (221) and a boss (222). The lower end of the support leg (221) has an abutment surface (2210), and the boss (222) protrudes downward relative to the abutment surface (2210). The abutment surface (2210) contacts the upper end surface (101) of the base component (1), and the boss (222) is inserted into the positioning recess (1010).

3. The pressure transmitter as described in claim 1 or 2, characterized in that, The connector assembly (2) is made of plastic and includes a shoulder (24). The limiting protrusion (62) abuts against the shoulder (24) to limit the upward displacement of the connector assembly (2) along the axial direction of the pressure transmitter. The housing (6) is a thin-walled cylindrical part made of stainless steel, and the limiting protrusion (62) is made by dotting.

4. The pressure transmitter according to any one of claims 1-3, characterized in that, The plug-in portion (22) includes a leg (221) and a boss (222). The lower end of the leg (221) has an abutment surface (2210), and the boss (222) protrudes downward relative to the abutment surface (2210). There are three legs (221), which are distributed in the circumferential direction of the plug-in assembly (2). At least one of the three legs (221) includes the boss (222), and the positioning recess (1010) is correspondingly provided with the boss (222).

5. The pressure transmitter according to any one of claims 1-4, characterized in that, The base component (1) includes an upper positioning step (1011), which is recessed downward relative to the upper end face (101). The housing (6) is welded and fixed to the step portion of the upper positioning step (1011). The plug-in portion (22) includes a support leg (221), the lower end of which has an abutment surface (2210) that contacts the upper end face (101) of the base component (1). There is a gap (26) between the outer side wall of the support leg (221) and the inner side wall of the housing (6).

6. The pressure transmitter as described in claim 5, characterized in that, It also includes a circuit element (5). The plug-in assembly (2) includes a port portion (21) and a plug portion (22). The plug portion (22) is disposed on the periphery of the port portion (21) and protrudes downward relative to the port portion (21). There is an installation space between the port portion (21) and the base component (1). The circuit element (5) is located in the installation space. The plug portion (22) also includes a communication port (223). The communication port (223) is a through hole or through groove that penetrates the inner and outer side walls of the support leg (221). The communication port (223) connects the gap (26) between the support leg (221) and the housing (6) and the installation space inside the support leg (221).

7. The pressure transmitter as described in any one of claims 1-6, characterized in that, The system includes an air inlet assembly (7), a diaphragm (31), and a pressure sensing element (33). The diaphragm (31) is fixed on the base component (1) and divides the space between the base component (1) and the air inlet assembly (7) into a pressure sensing chamber (32) and an air inlet chamber (73). The pressure sensing chamber (32) is located between the base component (1) and the diaphragm (31), and the pressure sensing element (33) is located in the pressure sensing chamber (32). The base component (1) includes an oil filling channel (4) that connects to the pressure sensing chamber (32). The oil filling port (40) of the oil filling channel (4) is located on the upper end face (101) of the base component (1), and there is a predetermined distance between the oil filling port (40) and the positioning recess (1010).

8. The pressure transmitter according to any one of claims 1-7, characterized in that, The system includes an air inlet assembly (7), a diaphragm (31), and a pressure sensing element (33). The diaphragm (31) is fixed on the base component (1) and divides the space between the base component (1) and the air inlet assembly (7) into a pressure sensing chamber (32) and an air inlet chamber (73). The pressure sensing chamber (32) is located between the base component (1) and the diaphragm (31), and the pressure sensing element (33) is located in the pressure sensing chamber (32). The base component (1) includes an oil filling channel (4) that connects to the pressure sensing chamber (32). The oil filling port (40) of the oil filling channel (4) is located on the upper end face (101) of the base component (1). It also includes a steel ball (41), which is welded and fixed to the oil filling port (40) and seals the oil filling port (40).

9. The pressure transmitter as described in claim 7 or 8, characterized in that, The air inlet assembly (7) includes a connecting plate (71) and an inlet seat (72). The lower end of the connecting plate (71) is welded and fixed to the upper end of the inlet seat (72). The lower end face (102) of the base component (1) includes a lower positioning step (1021). The upper end of the connecting plate (71) is welded and fixed to the lower positioning step (1021). The pressure transmitter also includes a glass sealing assembly (3) and the pressure sensing element (33). The base component (1) includes... Mounting hole (10) is located at the radial center of the base component (1) and axially penetrates the base component (1). The glass sealing assembly (3) is accommodated in the mounting hole (10) and fixedly connected to the hole wall of the mounting hole (10). The pressure sensing element (33) is fixedly connected to the lower end face (102) of the glass sealing assembly (3). The positioning recess (1010) and the oil filling port (40) are located on both sides of the mounting hole (10).

10. The pressure transmitter as described in claim 9, characterized in that, The connector assembly (2) includes a pin (25), and the pressure transmitter also includes a circuit element (5). The connector assembly (2) includes a port portion (21), and the circuit element (5) is located between the port portion (21) and the base component (1). The glass sealing assembly (3) includes a pin (34), and the pin (34), the circuit element (5), and the pin (25) are positioned correspondingly. The pressure sensing element (33), the pin (34), the circuit element (5), and the pin (25) are electrically connected.

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