A pressure sensor suitable for use in high humidity environments

Abstract

The utility model discloses a pressure sensor suitable for high humidity environment, including casing, elastomer, conductive pad, heteromorphic sealing washer, full bridge strain gauge, amplifier and cable assembly, the casing includes upper casing, lower casing and apron, and the heteromorphic sealing washer is sealed to set in the connecting place of elastomer and upper casing, lower casing, and the elastomer is electrically connected with upper casing through conductive pad. The utility model elastomer both ends outer thread and taper surface are connected with high pressure pipe, guarantee liquid phase not to leak out, and the amplifier is placed directly in the cavity of casing, and the pressure value is directly shown on main screen, and the space is saved for equipment, and the casing adopts heteromorphic sealing washer, and combines Parylene -C coating, so that the sensor has excellent waterproof performance, thereby realizing normal work under high humidity environment, and the casing and elastomer are electrically connected through conductive block, and combine the shielded wire and shielded shell on cable assembly, realize grounding and shielding, and effectively improve the interference ability of electrostatic and electromagnetic of equipment.

Description

Technical Field

[0001] This utility model belongs to the field of sensor technology, specifically relating to a pressure sensor suitable for high humidity environments. Background Technology

[0002] A pressure sensor is installed at the pump head of a liquid chromatograph to monitor the inlet pressure, back pressure, and outlet pressure in real time. Existing pressure sensors have relatively simple structures and short lifespans in high-humidity environments. Therefore, a pressure sensor suitable for high-humidity environments is urgently needed. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a pressure sensor suitable for high humidity environments.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0005] This utility model provides a pressure sensor suitable for high humidity environments, including a housing, an elastomer, a conductive pad, a shaped sealing ring, a full-bridge strain gauge, an amplifier, and a cable assembly. The housing includes an upper housing, a lower housing, and a cover plate. The upper housing covers the upper surface of the lower housing, and the cover plate covers the lower surface of the lower housing. The elastomer is positioned between the lower and upper housings, with its two ends along its length located outside the upper and lower housings. The shaped sealing ring is fitted onto both ends of the elastomer along its length and seals the connection between the elastomer and the upper and lower housings. The elastomer is electrically connected to the upper housing via the conductive pad. The elastomer has a strain gauge section, and the full-bridge strain gauge is attached to the strain gauge section. The amplifier is located on the lower surface of the lower housing and inside the cover plate. The full-bridge strain gauge is electrically connected to the amplifier, and the cable assembly is electrically connected to the amplifier.

[0006] Preferably, the upper surface of the lower housing is provided with an upper mounting boss. The upper surface of the upper mounting boss and its two ends along its length are respectively provided with a lower left arc-shaped mounting groove and a lower right arc-shaped mounting groove. The upper surface of the upper mounting boss and its two ends along its length are provided with a lower arc-shaped mounting groove. The upper surface of the upper mounting boss and its two sides along the length of the lower arc-shaped mounting groove are provided with side mounting grooves. The center of the upper mounting boss is provided with a central through hole that passes through the upper mounting boss and the lower housing. The upper mounting boss is provided with a first mounting through hole that passes through the upper mounting boss and the lower housing around its perimeter. The lower housing is provided with a second mounting through hole on both sides along the length of the upper mounting boss.

[0007] Preferably, the lower surface of the upper housing is provided with an upper left arc surface mounting groove and an upper right arc surface mounting groove respectively at both ends along its length. The lower surface of the upper housing is provided with an upper arc surface mounting groove between the upper left arc surface mounting groove and the upper right arc surface mounting groove. The center of the lower surface of the upper housing is provided with an upper flat surface mounting groove. The lower surface of the upper housing is provided with upper mounting holes around its perimeter. The upper mounting holes correspond to the second mounting through holes.

[0008] Preferably, the elastomer is a hollow cylindrical structure, and external threaded connection portions are provided on the circumferential surfaces of both ends of the elastomer along its axial direction. Conical connection portions are provided on both ends of the elastomer along its axial direction and inside the external threads. The circumferential surfaces of the elastomer are located in the upper arc surface mounting groove and the lower arc surface mounting groove. The external threaded connection portions and the conical connection portions are located outside the upper left arc surface mounting groove, the upper right arc surface mounting groove, the lower left arc surface mounting groove, and the lower right arc surface mounting groove.

[0009] Preferably, the strain section is located at the middle position along the length of the elastic body. A first groove is formed on the strain section. Two second grooves are symmetrically arranged on both sides of the first groove on the circumferential surface of the elastic body. The bottom of the first groove and the bottom of the second groove are planar structures and are perpendicular to each other. The first groove is arranged opposite to the central through hole. The second groove is arranged opposite to the sidewalls of the upper left arc surface mounting groove, the upper right arc surface mounting groove, the lower left arc surface mounting groove, and the lower right arc surface mounting groove.

[0010] Preferably, the lower surface of the conductive pad is provided with an arc-shaped pad groove, the arc-shaped pad groove is sleeved on the circumferential surface of the elastic body opposite to the first groove, and the upper surface of the conductive pad is disposed in the mounting groove of the upper plane of the upper shell.

[0011] Preferably, the irregular sealing ring includes an integrally formed left sealing ring, a right sealing ring, a first connecting arm, and a second connecting arm. The left sealing ring is sleeved on the axial left end of the elastic body and is disposed in the upper left arc surface mounting groove and the lower left arc surface mounting groove. The right sealing ring is sleeved on the axial right end of the elastic body and is disposed in the upper right arc surface mounting groove and the lower right arc surface mounting groove. The two ends of the first connecting arm and the second connecting arm in the length direction are respectively connected to the left sealing ring and the right sealing ring and disposed in the side mounting groove. The first connecting arm and the second connecting arm each have two connecting arm through holes, and the positions of the connecting arm through holes correspond to the positions of the second mounting through holes.

[0012] Preferably, a first lower mounting groove is recessed upward on the lower surface of the lower housing, and a first mounting through hole is located in the first lower mounting groove. The upper housing and the lower housing are fixedly connected by a first screw. The lower end of the first screw is engaged in the first lower mounting groove, and the upper end of the first screw passes through the first mounting through hole and the connecting arm through hole in sequence and is then fixedly connected to the upper mounting hole. A second lower mounting groove is also recessed upward on the lower surface of the lower housing and located outside the first lower mounting groove. The amplifier is disposed in the second lower mounting groove.

[0013] Preferably, a drainage groove is provided on the lower side wall of the lower housing.

[0014] Preferably, the upper and lower shells are coated with Parylene-C, and the cover plate is made of PVC material.

[0015] Compared with the prior art, this utility model has the following advantages:

[0016] The external threads and conical surfaces at both ends of the elastomer of this invention connect to the high-pressure pipe to ensure that the liquid phase does not leak out; the amplifier is placed directly in the cavity of the housing, and the pressure value can be directly displayed on the main screen, saving space for the equipment; the housing adopts a special-shaped sealing ring, combined with a Parylene-C coating, which gives the sensor excellent waterproof performance, thus enabling normal operation in high humidity environments; the housing and the elastomer are electrically connected through conductive blocks, and combined with the shielding wire and shielding shell on the cable assembly, grounding and shielding are achieved, effectively improving the equipment's ability to resist electrostatic and electromagnetic interference. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a pressure sensor suitable for high humidity environments according to this utility model;

[0018] Figure 2 This is an exploded structural diagram of a pressure sensor suitable for high humidity environments according to this utility model;

[0019] Figure 3 This is a schematic diagram of the installation structure of the elastic body in a pressure sensor suitable for high humidity environments according to this utility model;

[0020] Figure 4 This is a schematic diagram of the upper housing structure of a pressure sensor suitable for high humidity environments according to this utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the upper surface of the lower housing of a pressure sensor suitable for high humidity environments according to this utility model;

[0022] Figure 6 This is a schematic diagram of the lower surface of the lower housing of a pressure sensor suitable for high humidity environments according to this utility model;

[0023] Figure 7 This is a schematic diagram of the structure of the elastic body in a pressure sensor suitable for high humidity environments according to this utility model;

[0024] Figure 8 This is a schematic diagram of the irregularly shaped sealing ring in a pressure sensor suitable for high humidity environments according to this utility model. Detailed Implementation

[0025] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0026] In the description of this utility model, it should be understood that the terms "left," "right," "up," "down," etc., indicating the orientation or positional relationship are all based on the accompanying drawings. Figure 1 The orientations or positional relationships shown are for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] like Figures 1 to 8 As shown, this embodiment provides a pressure sensor suitable for high humidity environments, including a housing 1, an elastomer 2, a conductive pad 3, a shaped sealing ring 4, a full-bridge strain gauge, an amplifier 5, and a cable assembly 6. The housing 1 includes an upper housing 11, a lower housing 12, and a cover plate 13. The upper housing 11 covers the upper surface of the lower housing 12, and the cover plate 13 covers the lower surface of the lower housing 12. The elastomer 2 is engaged between the lower housing 11 and the upper housing 12, with its two ends along its length located between the upper housing 11 and the lower housing 12. On the outside of body 12, the irregular sealing ring 4 is sleeved on both ends of the elastomer 2 along its length and is sealed at the connection between the elastomer 2 and the upper housing 11 and the lower housing 12. The elastomer 2 and the upper housing 11 are electrically connected through a conductive pad 3. The elastomer 2 is provided with a strain section. The full-bridge strain gauge is attached to the strain section. The amplifier 5 is disposed on the lower surface of the lower housing 12 and located inside the cover plate 13. The full-bridge strain gauge is electrically connected to the amplifier 5. The cable assembly 6 is electrically connected to the amplifier 5.

[0029] like Figures 5 to 6 As shown, the upper surface of the lower housing 12 is provided with an upper mounting boss 120. On the upper surface of the upper mounting boss 120, at both ends along its length, there are respectively a lower left arc-shaped mounting groove 121 and a lower right arc-shaped mounting groove 122. On the upper surface of the upper mounting boss 120, between the lower left arc-shaped mounting groove 121 and the lower right arc-shaped mounting groove 122, there is a lower arc-shaped mounting groove 123. On the upper surface of the upper mounting boss 120, on both sides along the length of the lower arc-shaped mounting groove 123, there are side mounting grooves 124. At the center of the upper mounting boss 120, there is a central through hole 125 that passes through the upper mounting boss and the lower housing. Around the upper mounting boss 120, there are first mounting through holes 126 that pass through the upper mounting boss and the lower housing. On the lower housing 12, on both sides along the length of the upper mounting boss, there are second mounting through holes 127.

[0030] like Figure 4 As shown, the lower surface of the upper housing 11 is provided with an upper left arc surface mounting groove 111 and an upper right arc surface mounting groove 112 respectively at both ends along its length. The lower surface of the upper housing 11 is provided with an upper arc surface mounting groove 113 between the upper left arc surface mounting groove 111 and the upper right arc surface mounting groove 112. The center of the lower surface of the upper housing 11 is provided with an upper flat surface mounting groove 114. The lower surface of the upper housing is provided with upper mounting holes 115 around its perimeter. The upper mounting holes 115 correspond to the second mounting through hole 126.

[0031] like Figure 7 As shown, the elastic body 2 is a hollow cylindrical structure. Both ends of the elastic body 2 are provided with external threaded connection parts on their circumferential surfaces. Both ends of the elastic body 2 are provided with conical connection parts located inside the external threads. The circumferential surfaces of the elastic body 2 are located in the upper arc surface mounting groove 113 and the lower arc surface mounting groove 123. The external threaded connection parts and the conical connection parts are located outside the upper left arc surface mounting groove 111, the upper right arc surface mounting groove 112, the lower left arc surface mounting groove 121, and the lower right arc surface mounting groove 122.

[0032] like Figure 7 As shown, the strain section is located at the middle position along the length of the elastic body 2. A first groove 21 is provided on the strain section. Two second grooves 22 are symmetrically provided on both sides of the first groove on the circumferential surface of the elastic body. The bottom of the first groove 21 and the bottom of the second groove 22 are planar structures and are perpendicular to each other. The first groove 21 is opposite to the central through hole 125. The second groove 22 is opposite to the sidewalls of the upper left arc surface mounting groove 111, the upper right arc surface mounting groove 112, the lower left arc surface mounting groove 121, and the lower right arc surface mounting groove 122.

[0033] In this embodiment, the lower surface of the conductive pad is provided with an arc-shaped pad groove, the arc-shaped pad groove is sleeved on the circumferential surface of the elastic body opposite to the first groove, and the upper surface of the conductive pad is disposed in the mounting groove of the upper plane of the upper shell.

[0034] like Figure 8 As shown, the irregular sealing ring 4 includes an integrally formed left sealing ring 43, a right sealing ring 44, a first connecting arm 41, and a second connecting arm 42. The left sealing ring 43 is sleeved on the axial left end of the elastic body and is disposed in the upper left arc surface mounting groove 111 and the lower left arc surface mounting groove 121. The right sealing ring 44 is sleeved on the axial right end of the elastic body and is disposed in the upper right arc surface mounting groove 112 and the lower right arc surface mounting groove 122. The first connecting arm 41 and the second connecting arm 42 are disposed in the side mounting groove 124, and both ends of their length direction are connected to the left sealing ring 43 and the right sealing ring 44, respectively. The first connecting arm 41 and the second connecting arm 42 are each provided with two connecting arm through holes 45, and the positions of the connecting arm through holes 45 and the second mounting through holes 126 correspond to each other.

[0035] In this embodiment, a first lower mounting groove 128 is recessed upward on the lower surface of the lower housing 12, and a first mounting through hole 126 is located in the first lower mounting groove 128. The upper housing 11 and the lower housing 12 are fixedly connected by a first screw 14. The lower end of the first screw 14 is engaged in the first lower mounting groove 128, and the upper end of the first screw 14 passes through the first mounting through hole 126 and the connecting arm through hole 45 in sequence and is then fixedly connected in the upper mounting hole 115. A second lower mounting groove 129 is also recessed upward on the lower surface of the lower housing 12 and outside the first lower mounting groove 128. The amplifier 5 is disposed in the second lower mounting groove 129.

[0036] In this embodiment, a drainage groove is provided on the lower side wall of the lower housing 12.

[0037] In this embodiment, the upper housing 11 and the lower housing 12 are coated with Parylene-C, and the cover plate 13 is made of PVC material.

[0038] The working principle of this embodiment will be further explained below:

[0039] The pressure sensor provided in this embodiment is installed at the pump head of the liquid chromatograph to monitor the pre-column pressure, column back pressure, and post-column pressure in real time. When pressure fluctuations are detected, the control system adjusts the mobile phase flow rate or issues a maintenance prompt based on the pressure value, improving operating efficiency and data accuracy. The external threads and tapered surfaces at both ends of the elastomer connect to the high-pressure pipe to ensure that the liquid phase does not leak out. The amplifier is placed directly inside the housing cavity, allowing the pressure value to be displayed directly on the main screen, saving space for the equipment. The housing uses a shaped sealing ring combined with a Parylene-C coating, giving the sensor excellent waterproof performance, thus enabling normal operation in high-humidity environments. The housing and elastomer are electrically connected through a conductive block, and combined with the shielding wire and shielding shell on the cable assembly, grounding and shielding are achieved, effectively improving the equipment's electrostatic and electromagnetic interference resistance.

[0040] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pressure sensor suitable for high humidity environments, characterized in that, The system includes a housing (1), an elastomer (2), a conductive pad (3), a shaped sealing ring (4), a full-bridge strain gauge, an amplifier (5), and a cable assembly (6). The housing (1) includes an upper housing (11), a lower housing (12), and a cover plate (13). The upper housing (11) covers the upper surface of the lower housing (12), and the cover plate (13) covers the lower surface of the lower housing (12). The elastomer (2) is positioned between the upper housing (11) and the lower housing (12), with its two ends along its length located outside the upper housing (11) and the lower housing (12). The irregular sealing ring (4) is sleeved on both ends of the elastomer (2) along its length and is sealed at the connection between the elastomer (2) and the upper shell (11) and the lower shell (12). The elastomer (2) and the upper shell (11) are electrically connected by a conductive pad (3). The elastomer (2) is provided with a strain section. The full-bridge strain gauge is attached to the strain section. The amplifier (5) is disposed on the lower surface of the lower shell (12) and located inside the cover plate (13). The full-bridge strain gauge is electrically connected to the amplifier (5). The cable assembly (6) is electrically connected to the amplifier (5).

2. The pressure sensor suitable for high humidity environments according to claim 1, characterized in that, The upper surface of the lower housing (12) is provided with an upper mounting boss (120). On the upper surface of the upper mounting boss (120) and at both ends along its length, there are respectively a lower left arc surface mounting groove (121) and a lower right arc surface mounting groove (122). On the upper surface of the upper mounting boss (120) and between the lower left arc surface mounting groove (121) and the lower right arc surface mounting groove (122), there is a lower arc surface mounting groove (123). On the upper surface of the upper mounting boss (120) and on both sides along the length of the lower arc surface mounting groove (123), there are side mounting grooves (124). The center of the upper mounting boss (120) is provided with a central through hole (125) that passes through the upper mounting boss and the lower housing. The upper mounting boss (120) is provided with a first mounting through hole (126) that passes through the upper mounting boss and the lower housing around its perimeter. The lower housing (12) is provided with a second mounting through hole (127) on both sides along the length of the upper mounting boss.

3. The pressure sensor suitable for high humidity environments according to claim 2, characterized in that, The lower surface of the upper housing (11) is provided with an upper left arc surface mounting groove (111) and an upper right arc surface mounting groove (112) respectively at both ends along its length. The lower surface of the upper housing (11) is provided with an upper arc surface mounting groove (113) between the upper left arc surface mounting groove (111) and the upper right arc surface mounting groove (112). The center of the lower surface of the upper housing (11) is provided with an upper flat surface mounting groove (114). The lower surface of the upper housing is provided with upper mounting holes (115) around its perimeter. The upper mounting holes (115) correspond to the first mounting through hole (126).

4. The pressure sensor suitable for high humidity environments according to claim 3, characterized in that, The elastic body (2) is a hollow cylindrical structure. Both ends of the elastic body (2) are provided with external threaded connection parts. Both ends of the elastic body (2) are provided with conical connection parts inside the external threads. The circumferential surface of the elastic body (2) is located in the upper arc surface mounting groove (113) and the lower arc surface mounting groove (123). The external threaded connection parts and the conical connection parts are located outside the upper left arc surface mounting groove (111), the upper right arc surface mounting groove (112), the lower left arc surface mounting groove (121), and the lower right arc surface mounting groove (122).

5. The pressure sensor suitable for high humidity environments according to claim 4, characterized in that, The middle position of the elastomer (2) in the length direction is the strain section. The strain section is provided with a first groove (21). On the circumferential surface of the elastomer, two second grooves (22) are symmetrically provided on both sides of the first groove. The bottom of the first groove (21) and the bottom of the second groove (22) are planar structures and the bottoms of the two grooves are perpendicular to each other. The first groove (21) is opposite to the central through hole (125). The second groove (22) is opposite to the sidewalls of the upper left arc surface mounting groove (111), the upper right arc surface mounting groove (112), the lower left arc surface mounting groove (121), and the lower right arc surface mounting groove (122).

6. The pressure sensor suitable for high humidity environments according to claim 5, characterized in that, The lower surface of the conductive pad is provided with an arc-shaped pad groove, which is sleeved on the circumferential surface of the elastic body opposite to the first groove. The upper surface of the conductive pad is disposed in the mounting groove on the upper plane of the upper shell.

7. The pressure sensor suitable for high humidity environments according to claim 6, characterized in that, The irregular sealing ring (4) includes an integrally formed left sealing ring (43), a right sealing ring (44), a first connecting arm (41), and a second connecting arm (42). The left sealing ring (43) is sleeved on the axial left end of the elastic body and is located in the upper left arc surface mounting groove (111) and the lower left arc surface mounting groove (121). The right sealing ring (44) is sleeved on the axial right end of the elastic body and is located in the upper right arc surface mounting groove (112) and the lower right arc surface mounting groove (122). The first connecting arm (41) and the second connecting arm (42) are located in the side mounting groove (124), and both ends of their length direction are connected to the left sealing ring (43) and the right sealing ring (44), respectively. The first connecting arm (41) and the second connecting arm (42) each have two connecting arm through holes (45), and the positions of the connecting arm through holes (45) correspond to the positions of the first mounting through holes (126).

8. The pressure sensor suitable for high humidity environments according to claim 7, characterized in that, The lower housing (12) has a first lower mounting groove (128) recessed upward on its lower surface. The first mounting through hole (126) is located in the first lower mounting groove (128). The upper housing (11) and the lower housing (12) are fixedly connected by a first screw (14). The lower end of the first screw (14) is engaged in the first lower mounting groove (128). The upper end of the first screw (14) passes through the first mounting through hole (126) and the connecting arm through hole (45) in sequence and is then fixedly connected in the upper mounting hole (115). The lower housing (12) also has a second lower mounting groove (129) recessed upward on its lower surface and outside the first lower mounting groove (128). The amplifier (5) is disposed in the second lower mounting groove (129).

9. The pressure sensor suitable for high humidity environments according to claim 8, characterized in that, A drainage groove is provided on the lower side wall of the lower housing (12).

10. The pressure sensor suitable for high humidity environments according to claim 9, characterized in that, The upper shell (11) and lower shell (12) are coated with Parylene-C, and the cover plate (13) is made of PVC material.

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