Fluid pressure sensing device

Abstract

The application discloses a fluid pressure sensing device, comprising a joint assembly and a pressure sensing assembly, wherein the pressure sensing assembly is fixedly connected with the joint assembly, the pressure sensing assembly comprises a pressure sensing cavity, the joint assembly comprises a joint and a thimble, the joint comprises an inner cavity and a through hole between the inner cavity and the pressure sensing cavity, the thimble is fixedly connected to the inner wall of the through hole, and a communication channel is formed between the outer wall of the thimble and the inner wall of the through hole, and the communication channel communicates the inner cavity and the pressure sensing cavity. By connecting the thimble in the through hole, a gap channel is formed between the outer wall of the thimble and the inner wall of the through hole for fluid communication, the joint and the thimble are arranged in a split mode, the processing difficulty is reduced, and the gap channel plays a buffering role and is not prone to blockage.

Description

Technical Field

[0001] This invention relates to the field of fluid pressure sensing technology, and in particular to a fluid pressure sensing device such as a pressure switch or pressure sensor that is connected to a fluid pipeline. Background Technology

[0002] When the connector of the fluid pressure sensor is connected to the pipeline, it usually has a pin structure to open the pipeline valve core. The pin structure is generally set by integral molding with the connector. An air inlet needs to be opened on the side of the pin to communicate with the inner cavity of the fluid pressure sensor.

[0003] like Figure 1 , Figure 2 As shown, the pressure switch 1 includes a brass connector 10 as a connecting component, a stainless steel cap 20 as a housing component, a circular plate 30, a limiter 40, a switch portion 50, and an outer cover 60 made of a thin stainless steel sheet. The connector 10 has a main body 11, inside which an internal thread 11a is formed for mating with a pipe thread. A cylindrical portion 13 is provided on the flat surface 12 of the connector 10. The cylindrical portion 13 is formed in a cylindrical shape with its axis coinciding with the axis L, and an inner hole 14 is formed on its inner side. This inner hole 14 communicates with the threaded chamber 11A of the main body 11 via a guide passage 11b. In the above structure, the guide passage 11b is located on one side of the ejector pin 15, which is integrally formed with the cylindrical portion 13. The guide passage 11b needs to be separately made, which is inconvenient for processing. Summary of the Invention

[0004] To address the problems in the prior art, the present invention proposes a fluid pressure sensing device, comprising a connector assembly and a pressure sensing assembly, wherein the pressure sensing assembly is fixedly connected to the connector assembly, the pressure sensing assembly includes a pressure sensing cavity, the connector assembly includes a connector and a pin, the connector includes an inner cavity and a through hole located between the inner cavity and the pressure sensing cavity, the pin is fixedly connected to the inner wall of the through hole, and a communication channel is included between the outer wall surface of the pin and the inner wall surface of the through hole, the communication channel connecting the inner cavity and the pressure sensing cavity.

[0005] The fluid pressure sensing device of the present invention connects the ejector pin to the through hole, and forms a gap channel between the outer wall of the ejector pin and the inner wall of the through hole to allow fluid to flow. The connector and the ejector pin are set separately, which reduces the difficulty of processing. Attached Figure Description

[0006] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings will be briefly described below. The drawings are merely illustrative of some embodiments of the present invention and are not intended to limit the invention to all embodiments. In the drawings:

[0007] Figure 1This is a schematic diagram of the pressure switch in the background art;

[0008] Figure 2 This is a schematic diagram of the connector structure of a pressure switch in the background art;

[0009] Figure 3 This is a schematic diagram of the pressure switch in this invention;

[0010] Figure 4 This is a schematic diagram of the pressure sensor in this invention;

[0011] Figure 5 This is a schematic diagram of the connector assembly in this invention;

[0012] Figure 6 This is a schematic diagram of the structure of the connector and the ejector pin in a mating state according to one embodiment of the present invention;

[0013] Figure 7 This is a schematic diagram of the joint and ejector pin in a mating state according to another embodiment of the present invention;

[0014] Figure 8 for Figure 6 A schematic diagram of the ejector pin in the embodiment;

[0015] Figure 9 for Figure 6 A schematic diagram of the upward view of the pin in the embodiment.

[0016] In the picture:

[0017] 100. Connector assembly; 110. Connector; 111. First hole section; 1111. Arc-shaped transition section; 112. Second hole section; 101. Inner cavity; 102. Through hole; 103. Threaded section;

[0018] 120. Ejector pin; 121. Connecting part; 1211. Guide section; 1212. Connecting section; 122. Protrusion;

[0019] 200, Pressure sensing component; 201, Pressure sensing chamber; 210, Disc component; 220, Diaphragm; 230, Limiting plate; 300, Connecting flow channel; 310, Sub-channel;

[0020] 400. Casing;

[0021] 500. Transmission components;

[0022] 600. Switch assembly;

[0023] 700. Pressure-sensing element;

[0024] 800, Output Components. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below 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. Based on the embodiments of the present invention, all other technical solutions obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, it should be noted that the bolded lines in the drawings are merely illustrative of locations for ease of understanding and do not represent actual product features.

[0030] To achieve the above-mentioned objectives and other advantages of the present invention, the present invention provides the following technical solutions:

[0031] This invention provides a fluid pressure sensing device, such as... Figures 3 to 9 As shown, the fluid pressure sensing device includes a connector assembly 100 and a pressure sensing assembly 200. The pressure sensing assembly 200 is fixedly connected to the connector assembly 100, preferably by welding. The pressure sensing assembly 200 includes a pressure sensing cavity 201. The connector assembly 100 includes a connector 110 and a pin 120. The connector 110 includes an inner cavity 101 and a through hole 102 located between the inner cavity 101 and the pressure sensing cavity 201. The pin 120 is fixedly connected to the inner wall of the through hole 102, and a connecting channel 300 is included between the outer wall surface of the pin 120 and the inner wall surface of the through hole 102. The connecting channel 300 connects the inner cavity 101 and the pressure sensing cavity 201.

[0032] Specifically, such as Figure 5As shown, the pressure-sensing component 200 includes a diaphragm 220. Along the longitudinal direction of the fluid pressure sensing device, the diaphragm 220 is located above the disc component 210, and the aforementioned pressure-sensing cavity 201 is included between the connector 110 and the diaphragm 220. The connector 110 includes a through-hole, comprising a first hole segment 111 with a larger diameter and a second hole segment 112 with a smaller diameter. The first hole segment 111 and the second hole segment 112 are transitioned by a stepped surface. The inner cavity of the first hole segment 111 serves as the inner cavity 101 of the connector 110, and the second hole segment 112 includes the aforementioned through hole 102, which connects the inner cavity 101 and the pressure-sensing cavity 201. Furthermore, the end of the first hole segment 111 near the second hole segment 112 includes an arc-shaped transition section 1111, which facilitates guiding fluid flow to the through hole 102.

[0033] Furthermore, the ejector pin 120 includes a connecting portion 121 and a protrusion 122. The connecting portion 121 is fixedly connected to the inner wall of the through hole 102. Along the longitudinal direction of the fluid pressure sensing device, the protrusion 122 is located below the connecting portion 121, and the protrusion 122 is at least partially located in the inner cavity 101. Preferably, the top portion of the protrusion 122 extends into the space of the inner cavity 101 corresponding to the arc-shaped transition section 1111.

[0034] The fluid pressure device in this invention is mainly used in the gas flow path. When the connector 110 is connected to the system pipeline, the protrusion 122 of the ejector pin 120 pushes open the valve core at the installation position, and the gas medium in the flow path enters the pressure sensing chamber 201 of the fluid pressure sensing device through the connecting channel 300.

[0035] Preferred, such as Figure 8 , Figure 9 As shown, the protrusion 122 and the connecting part 121 are coaxially arranged, and the outer diameter of the protrusion 122 is less than or equal to the diameter of the inscribed circle of the connecting part 121. The above structural design avoids the situation where the pin 120 blocks the connecting channel 300 after the fluid pressure sensing device is connected to the system pipeline, thus preventing the fluid from entering the pressure sensing chamber 201.

[0036] Furthermore, to facilitate connection with system piping, the connector 110 includes a threaded section 103. Optionally, the threaded section 103 is located on the inner or outer wall surface of the connector 110, and the threaded section 103 is coaxially arranged with the through hole 102.

[0037] Furthermore, the ejector pin 120 is fixed to the wall of the through hole 102 by riveting. The cross-sectional shape of the outer wall of the ejector pin 120 and the inner wall of the through hole 102 is polygonal and circular, respectively. The fitting gap between the circular and polygonal walls serves as a connecting channel 300, which connects the inner cavity 101 of the connector 110 and the pressure-sensing cavity 201. The connector 110 and the ejector pin 120 are separately configured, which reduces the processing difficulty compared to the one-piece structure in the prior art.

[0038] Specifically, the polygon is preferably a regular polygon, which can be an equilateral triangle, square, regular pentagon, regular hexagon, etc. At least three sub-channels 310 are formed between the polygonal wall and the circular wall circumscribed or inscribed therewith. Compared to a single air hole located on one side of the ejector pin 120 in the prior art, the design of multiple sub-channels 310 surrounding the ejector pin 120 is closer to the air inlet, thus reducing the likelihood of blockage and flow obstruction. When connected to a high-pressure air circuit, the multiple sub-channels 310 provide uniform buffering and pressure relief, preventing excessively high airflow pressure entering the pressure-sensing chamber 201 from damaging the diaphragm 220.

[0039] It should be noted that, due to limitations in the riveting connection method and processing methods, the aforementioned regular polygons and circles refer to the main shape of the inner wall cross-section of the through hole 102 and the main shape of the outer wall cross-section of the connecting part 121 of the ejector pin 120 being close to a regular polygon and the other being close to a circle. The chamfers or bevels manufactured for ease of fitting or processing do not affect the main shape. Similarly, a regular polygon is also a preferred embodiment of the present invention. Other non-uniform polygonal shapes formed by the same design concept of forming multiple sub-channels 310, or spline shapes where straight edges are converted into angled edges, or where a polygonal connecting part 121 is fitted with a polygonal through hole 102, are also within the scope of protection of the present invention.

[0040] Taking the assembly of a regular hexagon and a circle as an example. In one embodiment, as... Figure 6 , Figure 8 , Figure 9 As shown, the connecting portion 121 is riveted to the inner wall of the through hole 102. The cross-section of the connecting portion 121 is regular hexagonal, and the protrusion 122 is cylindrical. The protrusion 122 is coaxially arranged with the connecting portion 121, and the outer diameter of the protrusion 122 is less than or equal to the diameter of the inscribed circle of the connecting portion 121. Specifically, the connecting portion 121 of the ejector pin 120 is a prism with a regular hexagonal cross-section, and the through hole 102 is a circular through hole 102. The edges of the connecting portion 121 are inscribed in the through hole 102. Multiple sub-channels 310 are formed between the side wall surface of the connecting portion 121 and the inner wall surface of the through hole 102.

[0041] The specific structure of ejector pin 120 is as follows: Figure 8 , Figure 9 As shown, the connecting part 121 includes a connecting segment 1212 located at the edge position. The connecting segment 1212 is a smooth transition segment with a certain width. Optionally, the connecting segment 1212 is made by grinding and chamfering the edge, so that the connecting part 121 is evenly stressed when riveting with the through hole 102, and the connecting part 121 is prevented from being crushed.

[0042] Furthermore, the connecting portion 121 also includes a guide segment 1211, which is correspondingly disposed to the edge of the connecting portion 121. The guide segment 1211 is located at the end of the edge near the protrusion 122, and the guide segment 1211 is recessed relative to the connecting portion 1212 towards the central axis of the connecting portion 121. Preferably, the guide segment 1211 is connected to the connecting portion 1212, and the guide segment 1211 includes a chamfered portion, through which the connecting portion 1212 and the guide segment 1211 transition. By providing the guide segment 1211, positioning and guiding can be achieved when the ejector pin 120 and the connector 110 are assembled, positioning the connecting portion 121 to the through hole 102, and guiding the lower end of the connecting portion 121 to the through hole 102 at the start of assembly, preventing inaccurate positioning from causing the connecting portion 1212 to bend at the end of the connector 110 during the riveting process.

[0043] Optional, such as Figure 7 As shown, the connecting part 121 of the ejector pin 120 can also be configured as a cylinder with a circular cross-section, and the through hole 102 is a hexagonal through hole 102. The outer wall surface of the connecting part 121 is in contact with the hole wall of the through hole 102. Multiple sub-channels 310 are formed between the outer wall surface of the connecting part 121 and the inner wall surface of the through hole 102.

[0044] In one embodiment, such as Figure 3 , Figure 5 As shown, the fluid pressure sensing device in this invention is specifically a pressure switch, which includes a housing 400 and a switching assembly 600 and a transmission assembly 500 installed inside the housing 400.

[0045] Specifically, the pressure-sensing component 200 is connected to the bottom of the housing 400. The pressure-sensing component 200 includes a disc component 210 and a diaphragm 220. The disc component 210 is fixedly connected to the connector 110, and the diaphragm 220 is fixed above the disc component 210. A limiting plate 230 is fixed above the diaphragm 220, clamping the diaphragm 220 with the disc component 210 and achieving a seal through welding. Simultaneously, the limiting plate 230 prevents excessive deformation of the diaphragm 220. A pressure-sensing cavity 201 is formed between the disc component 210 and the diaphragm 220, located on the side of the diaphragm 220 closest to the connector 110. A transmission component 500 is located on the other side of the diaphragm 220, with one end connected to the diaphragm 220 and the other end connected to the switch component 600. When the pressure changes, the diaphragm 220 moves, causing the transmission component 500 to control the switch component 600 to switch states. Optionally, the disc component 210, diaphragm 220, and limiting plate 230 can also be pressed and fixed together with other structural components.

[0046] In another embodiment, such as Figure 4As shown, the fluid pressure sensing device in this invention is specifically a pressure sensor, which includes a housing 400 and a pressure sensing element 700 and an output component 800 installed inside the housing 400.

[0047] The pressure sensing assembly 200 includes a diaphragm 220, a pressure sensing chamber 201 located on the side of the diaphragm 220 near the connector 110, a pressure sensing element 700 located on the other side of the diaphragm 220, and an output assembly 800 electrically connected to the pressure sensing element 700.

[0048] Specifically, the diaphragm 220 is fixed to the pressure-sensing element 700 on the side facing the connector 110, and the limiting plate 230 is fixed to the diaphragm 220 on the side facing the connector 110. The limiting plate 230 is provided with a flow hole, and the pressure-sensing chamber 201 is located between the diaphragm 220 and the connector 110. The pressure change in the pressure-sensing chamber 201 is transmitted to the pressure-sensing element 700 through the diaphragm 220. The pressure-sensing element 700 converts the received pressure signal into an electrical signal through a circuit board (not shown) and transmits it to the control system through the output component 800.

[0049] 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.

[0050] The above examples illustrate the principles and implementation methods of the present invention. The descriptions of these embodiments are merely illustrative and are intended to aid in understanding the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A fluid pressure sensing device, comprising a connector assembly (100) and a pressure sensing assembly (200), characterized in that, The pressure-sensing component (200) is fixedly connected to the connector assembly (100). The pressure-sensing component (200) includes a pressure-sensing cavity (201). The connector assembly (100) includes a connector (110) and a pin (120). The connector (110) includes an inner cavity (101) and a through hole (102) located between the inner cavity (101) and the pressure-sensing cavity (201). The pin (120) is fixedly connected to the inner wall of the through hole (102). A connecting channel (300) is included between the outer wall of the pin (120) and the inner wall of the through hole (102). The connecting channel (300) connects the inner cavity (101) and the pressure-sensing cavity (201).

2. The fluid pressure sensing device as described in claim 1, characterized in that, The ejector pin (120) includes a connecting part (121) and a protrusion (122). The connecting part (121) is fixedly connected to the inner wall of the through hole (102). Along the longitudinal direction of the fluid pressure sensing device, the protrusion (122) is located below the connecting part (121), and the protrusion (122) is at least partially located in the inner cavity (101).

3. The fluid pressure sensing device as described in claim 2, characterized in that, The through hole (102) has a circular cross-section, the connecting part (121) has a regular polygonal cross-section, and the connecting channel (300) includes at least three sub-channels (310).

4. The fluid pressure sensing device as described in claim 2, characterized in that, The cross-section of the through hole (102) is a regular polygon, the cross-section of the connecting part (121) is circular, and the connecting channel (300) includes at least three sub-channels (310).

5. The fluid pressure sensing device as described in claim 3, characterized in that, The connecting part (121) is riveted to the inner wall of the through hole (102). The cross-section of the connecting part (121) is a regular hexagon. The protrusion (122) is cylindrical. The protrusion (122) is coaxially arranged with the connecting part (121). The outer diameter of the protrusion (122) is less than or equal to the diameter of the inscribed circle of the connecting part (121).

6. The fluid pressure sensing device as described in claim 4, characterized in that, The cross-section of the through hole (102) is a regular hexagon.

7. The fluid pressure sensing device as described in claim 3, characterized in that, The outer wall surface of the connecting part (121) includes a guide section (1211), the guide section (1211) is disposed corresponding to the edge of the connecting part (121), the guide section (1211) is located at one end of the edge near the protrusion (122), and the guide section (1211) is recessed relative to the edge toward the central axis of the connecting part (121).

8. The fluid pressure sensing device according to any one of claims 1-7, characterized in that, The connector (110) includes a threaded section (103), which is located on the inner wall or the outer wall of the connector (110), and is coaxially arranged with the through hole (102).

9. The fluid pressure sensing device as described in claim 8, characterized in that, The fluid pressure sensing device is a pressure switch, which includes a housing (400) and a switching assembly (600) and a transmission assembly (500) installed inside the housing (400); The pressure-sensing assembly (200) is connected to the bottom of the housing (400). The pressure-sensing assembly (200) includes a disc component (210) and a diaphragm (220). The disc component (210) is fixedly connected to the connector (110). The diaphragm (220) is located above the disc component (210). The pressure-sensing chamber (201) is located on the side of the diaphragm (220) near the connector (110). The transmission assembly (500) is located on the other side of the diaphragm (220). One end of the transmission assembly (500) is connected to the diaphragm (220) in a driving connection, and the other end of the transmission assembly (500) is connected to the switch assembly (600) in a driving connection.

10. The fluid pressure sensing device as described in claim 8, characterized in that, The pressure sensing device is a pressure sensor, which includes a housing (400) and a pressure-sensing element (700) and an output component (800) installed inside the housing (400); The pressure-sensing assembly (200) includes a diaphragm (220), the pressure-sensing chamber (201) is located on the side of the diaphragm (220) near the connector (110), the pressure-sensing element (700) is located on the other side of the diaphragm (220), and the output assembly (800) is electrically connected to the pressure-sensing element (700).

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