pressure sensor

Abstract

The present invention provides a pressure sensor, which includes: a housing, the housing being provided with a communicating accommodating chamber and an opening; a pressure detection assembly being provided in the accommodating chamber; a piston being movably provided in the accommodating chamber, with one end of the piston facing away from the pressure detection assembly being located at the opening, for contacting a medium to be measured and capable of transmitting the pressure of the medium to be measured to the pressure detection assembly; and a guide member being provided in the accommodating chamber, the guide member being provided with a guide channel, at least a portion of the piston being located in the guide channel and capable of moving in the guide channel. That is, the piston is supported in the accommodating chamber so that when the piston moves relative to the housing, the central axis of the piston is parallel to or coincides with the central axis of the housing, effectively avoiding the problem of contact friction between the piston and the inner wall of the housing, which results in obstruction of the piston movement, due to displacement of the piston when it moves relative to the housing, thereby effectively improving the accuracy of the output data of the pressure sensor.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure detection, and in particular to a pressure sensor. Background Art

[0002] At present, in the relevant technology, in the shield machine industry, the pressure transmitter used to measure the mud pressure in the soil bin is generally a silicone oil piston pressure transmitter. When the mud pressure is detected, the mud pressure acts on the piston, and the piston movement squeezes the silicone oil filled in the cavity, and then the silicone oil transmits the pressure to the pressure core to realize the detection of the mud pressure.

[0003] However, during the movement of the piston relative to the cylinder, the piston is prone to tilt, causing the piston to contact and rub against the inner wall of the cylinder, resulting in obstruction of the piston movement, causing deviation in the output data of the pressure transmitter and affecting the detection accuracy of the pressure transmitter. Summary of the Invention

[0004] The embodiments of the present invention aim to solve at least one of the technical problems existing in the prior art.

[0005] To this end, a first aspect of an embodiment of the present invention provides a pressure sensor.

[0006] In view of this, according to a first aspect of an embodiment of the present invention, a pressure sensor is provided, which includes: a shell, the shell being provided with a connected accommodating cavity and an opening; a pressure detection assembly being provided in the accommodating cavity; a piston being movably provided in the accommodating cavity, with one end of the piston facing away from the pressure detection assembly being located at the opening, for contacting a medium to be measured, and capable of transmitting the pressure of the medium to be measured to the pressure detection assembly; a guide member being provided in the accommodating cavity, the guide member being provided with a guide channel, at least a portion of the piston being located in the guide channel, and capable of moving in the guide channel.

[0007] The pressure sensor provided by the embodiment of the present invention includes a housing, a pressure detection assembly, a piston and a guide. Specifically, the housing is provided with a receiving cavity and an opening, wherein the opening and the receiving cavity are communicated.

[0008] The side of the piston facing away from the pressure detection assembly is located at the opening and is intended to contact the medium to be measured. Specifically, when the pressure of the medium to be measured acts on the piston, the piston is capable of axial movement relative to the housing, transmitting the pressure to the pressure detection assembly via the silicone oil in the chamber, thereby detecting the pressure of the medium to be measured. It is understood that the pressure detection assembly can be electrically connected to the client's host computer, so that the pressure value detected by the pressure detection assembly can be transmitted to the client's host computer. The detected pressure value can be used to maintain the pressure of the mud film at the tunnel excavation face, thereby improving operational safety.

[0009] The guide member is disposed within the accommodating chamber and is provided with a guide channel. At least a portion of the piston is movably disposed within the guide channel. That is, when the pressure of the medium to be measured acts on the piston, at least a portion of the piston moves within the guide channel, thereby supporting the piston within the accommodating chamber so that when the piston moves relative to the housing, the central axis of the piston is parallel to or coincides with the central axis of the housing. This effectively avoids the problem of contact friction between the piston and the inner wall of the housing due to displacement of the piston when moving relative to the housing, which in turn hinders the piston's movement. This effectively improves the accuracy of the pressure sensor's output data. It also helps reduce wear on the piston and housing, extending the service life of the pressure sensor.

[0010] Optionally, the guide member comprises a copper member or a linear bearing.

[0011] Optionally, the guide member is a wear-resistant member.

[0012] Optionally, the hardness of the piston is greater than the hardness of the guide member, that is, the guide member is softer, which is beneficial to reducing the wear between the piston and the guide member during movement, reducing the resistance experienced by the piston, and ensuring the output accuracy of the pressure sensor.

[0013] In addition, the pressure sensor provided by the above technical solution of the present invention also has the following additional technical features:

[0014] In some technical solutions, optionally, the guide channel includes a channel wall, and the surface roughness of the channel wall is less than 0.8.

[0015] In this technical solution, the surface roughness of the channel wall is limited to less than 0.8, that is, the channel wall is a smooth wall surface, so that the guide member can support the piston and prevent the piston movement from being offset, while effectively reducing the friction between the piston and the guide member, thereby reducing the wear of the piston and the guide member due to friction, ensuring that the piston is not obstructed when moving axially relative to the housing, and improving the output accuracy of the pressure sensor.

[0016] In some technical solutions, optionally, the guide member is a copper member.

[0017] This technical solution specifies that the guide member be made of copper. As can be understood, copper is self-lubricating, thus supporting the piston and preventing displacement during movement. This effectively reduces friction between the piston and the guide member, thereby minimizing frictional wear on the piston and guide member, ensuring unimpeded axial movement of the piston relative to the housing and improving the output accuracy of the pressure sensor. Furthermore, copper's excellent wear resistance helps extend the life of the guide member.

[0018] In some technical solutions, optionally, part of the inner wall of the shell, one end of the piston away from the outlet and the pressure detection assembly enclose an oil filling chamber; the pressure sensor also includes a first oil groove, which is arranged on the side of the piston away from the outlet and is located between the piston and the inner wall of the shell. The first oil groove is connected to the oil filling chamber and extends at least partially along the radial direction of the piston.

[0019] This technical solution specifies that the pressure sensor also includes a first oil tank. Specifically, a portion of the inner wall of the housing, the end of the piston facing away from the outlet, that is, the end of the piston facing the pressure detection assembly, and the pressure detection assembly together form an oil filling chamber. It is understood that the oil filling chamber is used to accommodate the force transmission medium, namely silicone oil. Specifically, when the pressure of the medium to be measured acts on the piston, the piston can move axially relative to the housing to transmit the pressure to the pressure detection assembly through the silicone oil in the oil filling chamber, thereby detecting the pressure of the medium to be measured. It is understood that the oil filling chamber is part of the accommodating chamber.

[0020] The first oil groove is arranged on the piston, and the first oil groove is located between the piston and the inner wall of the shell. That is to say, the first oil groove is arranged in the gap between the inner wall of the shell and the piston, and the first oil groove is connected with the oil filling chamber, that is, the silicone oil in the oil filling chamber can partially flow into the first oil groove to fill the gap between the piston and the inner wall of the shell, and discharge the air in the gap between the piston and the inner wall of the shell, further ensuring that the piston is not obstructed when moving relative to the shell, which is conducive to further improving the output accuracy of the pressure sensor.

[0021] At least a portion of the first oil groove extends radially along the piston, that is, the surface of the piston perpendicular to the central axis of the piston is used to withstand the oil pressure, which is conducive to ensuring that the piston moves more smoothly during axial movement and further improving the detection accuracy of the pressure sensor.

[0022] In some technical solutions, optionally, there are multiple first oil grooves, and the multiple first oil grooves are arranged at intervals along the circumference of the piston, and each first oil groove is connected to the oil injection chamber.

[0023] In this technical solution, the number of first oil grooves is limited to multiple. Specifically, multiple first oil grooves are arranged at intervals along the circumference of the piston, and each first oil groove is connected to the oil filling chamber to further fill the gap between the piston and the inner wall of the shell, and discharge the air in the gap between the piston and the inner wall of the shell as much as possible, further ensuring that the piston is not obstructed when moving relative to the shell, which is conducive to further improving the output accuracy of the pressure sensor.

[0024] Optionally, the plurality of first oil grooves are evenly distributed along the circumferential direction.

[0025] In some technical solutions, optionally, the pressure sensor also includes a second oil groove, which is arranged on the side of the guide member facing the piston and extends at least partially along the axial direction of the piston. The second oil groove is connected to the guide channel, one end of the second oil groove is connected to the oil filling chamber, and the other end of the second oil groove is connected to the first oil groove.

[0026] In this technical solution, it is defined that the pressure sensor also includes a second oil groove. Specifically, the second oil groove is arranged on the side of the guide member facing the piston, and the second oil groove is connected to the guide channel, that is, the second oil groove is arranged on the radial inner side of the guide member.

[0027] The second oil groove extends axially along the piston, with one end communicating with the oil filling chamber and the other end communicating with the first oil groove. This second oil groove ensures that silicone oil in the oil filling chamber can flow through the second oil groove into the first oil groove, filling the gap between the piston and the inner wall of the housing. Furthermore, the second oil groove fills the gap between the guide member and the piston, further discharging air from the chamber, preventing obstruction of piston movement and improving the pressure sensor's detection accuracy.

[0028] In some technical solutions, optionally, there are multiple second oil grooves, and the multiple second oil grooves are arranged at intervals along the circumference of the piston, and each second oil groove passes through the guide member along the axial direction of the piston.

[0029] In this technical solution, the number of second oil grooves is limited to multiple. Specifically, the multiple second oil grooves are arranged at intervals along the circumference of the piston, so as to ensure that each first oil groove can be quickly filled with silicone oil through the multiple second oil grooves, so as to discharge the air in the accommodating cavity as much as possible, prevent the piston movement from being obstructed, and help further improve the output accuracy of the pressure sensor.

[0030] Optionally, the plurality of second oil grooves are evenly distributed along the circumferential direction.

[0031] In some technical solutions, optionally, the piston includes a main body and a transmission part, wherein the outer surface of the main body is exposed to the opening for contacting the medium to be measured, the first oil groove is arranged on the side of the main body away from the outlet, the transmission part is arranged on the side of the main body away from the outlet, and at least a portion of the transmission part is located in the guide channel.

[0032] In this technical solution, it is defined that the piston includes a main body and a transmission part. Specifically, the outer surface of the main body is exposed to the opening. That is to say, the pressure of the medium to be measured acts on the outer surface of the main body, and the transmission part is driven to move through the main body to squeeze the silicone oil in the oil filling chamber. The silicone oil transmits the pressure to the pressure detection component to realize the detection of the pressure of the medium to be measured.

[0033] At least a portion of the transmission part is located in the guide channel, that is, the piston is supported at the tail of the piston, effectively avoiding the problem of contact friction between the piston and the inner wall of the shell, which causes the piston movement to be obstructed due to the displacement of the tail of the piston when it moves relative to the shell, thereby effectively improving the accuracy of the pressure sensor output data.

[0034] Optionally, the main body and the transmission part are an integrated structure.

[0035] In some technical solutions, optionally, the pressure sensor further includes a seal, which is disposed between the outer wall of the body and the inner wall of the shell.

[0036] In this technical solution, it is defined that the pressure sensor further includes a seal. Specifically, the seal is provided between the inner wall of the housing and the outer wall of the piston, thereby sealing the gap between the outer wall of the piston and the inner wall of the housing.

[0037] It is understandable that the piston and the housing themselves have tolerances in manufacturing and processing. When they are used after being assembled, silicone oil leakage is likely to occur when a momentary overload impact occurs.

[0038] By setting a seal between the outer wall of the piston and the inner wall of the housing, the accommodating chamber can be effectively sealed to prevent silicone oil leakage and oil pressure changes, thereby ensuring that the piston does not deviate when moving relative to the housing, thereby improving the detection accuracy of the pressure sensor.

[0039] In addition, the provision of a seal can also provide good support for the piston. When the piston moves axially relative to the housing, the central axis of the piston can be parallel to or coincide with the central axis of the housing. This is beneficial to ensure that the piston does not deviate when moving axially relative to the housing, and is not affected by structural jamming forces, thereby preventing the piston movement from being obstructed, and is beneficial to further improving the detection accuracy of the pressure sensor.

[0040] Optionally, the sealing member comprises an O-ring.

[0041] In some technical solutions, optionally, the number of the sealing members is at least two, and the at least two sealing members are arranged along the axial direction of the piston.

[0042] In this technical solution, the number of seals is limited to at least two. Specifically, at least two seals are arranged along the axial direction of the piston, which is conducive to further sealing the gap between the outer wall of the piston and the inner wall of the shell, and further avoiding silicone oil leakage.

[0043] At the same time, it can further enhance the supporting effect on the piston, making the central axis of the piston as parallel or overlapping as possible with the central axis of the housing, which is beneficial to ensure that the piston does not deviate when moving axially relative to the housing, and is not affected by structural jamming forces, thereby preventing the piston movement from being obstructed, and is beneficial to further enhance the detection accuracy of the pressure sensor.

[0044] In some technical solutions, optionally, the housing is further provided with an oil injection channel, which is connected to the oil injection chamber; the pressure sensor further includes a valve body, which is provided in the oil injection channel and is used to open or close the oil injection channel.

[0045] In this technical solution, it is defined that the pressure sensor further includes a valve body. Specifically, the oil injection channel is connected to the oil injection cavity and is used to inject a force transmission medium into the oil injection cavity. The force transmission medium includes silicone oil.

[0046] It is understandable that the silicone oil system manufacturing process is generally as follows: the product is placed in a vacuum chamber, the entire chamber is evacuated, and the air in the silicone oil cavity (oil filling cavity) inside the product is also extracted to achieve a vacuum state; then, the product is immersed in a silicone oil pool in the vacuum chamber, and the silicone oil fills the oil filling cavity inside the product from the oil filling hole; then, a steel ball is placed in the oil filling hole and welded to the oil filling hole using resistance welding to seal the silicone oil cavity.

[0047] However, there is silicone oil on the surface of the oil filling hole and the steel ball bonding line. During resistance welding, the high temperature will cause the silicone oil to produce gas, so that the oil filling cavity is not entirely filled with silicone oil. Due to the huge difference in the compression ratio of liquid silicone oil and gas, even a small amount of gas will affect the linear accuracy of the pressure sensor.

[0048] Moreover, the steel ball and the cylinder are welded together. Once a problem with the oil filling is found, if you want to remove the steel ball, re-fill the oil and re-weld it, you have to cut it, which is difficult and usually cannot be repaired, increasing the difficulty and cost of maintenance.

[0049] Specifically, after the oil filling is completed, the oil filling channel is closed by the valve body to prevent silicone oil leakage, which is beneficial to prevent the piston from shifting during axial movement relative to the housing. At the same time, it avoids the generation of gas in the oil filling chamber due to resistance welding, thereby improving the detection accuracy of the pressure sensor.

[0050] In addition, the valve body can be opened to refill the oil, which helps to reduce the difficulty and cost of maintenance.

[0051] Optionally, the valve body comprises a ball valve.

[0052] Optionally, the pressure sensor further includes a plurality of fixing screws for fixing the valve body.

[0053] In some technical solutions, optionally, the pressure sensor further includes a toothed structure, which is provided at an end of the piston away from the pressure detection assembly and is at least partially located between an outer wall of the piston and an inner wall of the housing.

[0054] In this technical solution, it is defined that the pressure sensor also includes a toothed structure. Specifically, the toothed structure is arranged at the end of the piston away from the pressure detection component, that is, the toothed structure is also located at the opening. At least a portion of the toothed structure is arranged between the inner wall of the shell and the outer wall of the piston, so that when the pressure of the medium to be measured acts on the piston, the piston can drive the toothed structure to move relative to the shell to cut the more viscous medium to be measured between the piston and the inner wall of the shell, effectively avoiding the medium to be measured from hardening or clogging in the gap between the outer wall of the piston and the inner wall of the shell, and thus avoiding the situation where the piston moves poorly or is blocked relative to the shell, thereby improving the detection accuracy of the pressure sensor and reducing the probability of failure of the pressure sensor, which is conducive to ensuring the normal operation of the shield machine with the pressure sensor and improving operation safety.

[0055] In some technical solutions, optionally, the tooth-shaped structure includes a plurality of first teeth, and the plurality of first teeth are arranged at intervals on the outer peripheral side of the piston along the circumference of the piston.

[0056] In this technical solution, it is defined that the tooth-shaped structure includes multiple first teeth. Specifically, along the circumference of the piston, multiple first teeth are spaced apart on the outer peripheral side of the piston. When the pressure of the medium to be measured acts on the piston, the piston can drive the tooth-shaped structure to move relative to the housing, so that the multiple first teeth can cut the more viscous medium to be measured between the piston and the inner wall of the housing, effectively avoiding the hardening and blockage of the medium to be measured in the gap between the outer wall of the piston and the inner wall of the housing, thereby avoiding the situation where the piston moves poorly or is blocked relative to the housing, thereby improving the detection accuracy of the pressure sensor and reducing the probability of failure of the pressure sensor.

[0057] Optionally, any two adjacent first teeth and a portion of the outer wall of the piston form a flow channel, which is connected to the opening; the housing further comprises an overflow port, which is connected to the opening. It is understood that the overflow port is connected to the outside, so that the measured medium deposited in the gap between the inner wall of the housing and the piston can be discharged through the overflow port, further preventing blockage caused by compaction and deposition, which in turn could hinder piston movement, thereby improving the detection accuracy of the pressure sensor.

[0058] Any two adjacent first teeth and part of the outer wall of the piston enclose a guide channel, and the guide channel is connected to the opening. When the piston contacts the medium to be measured, the medium to be measured can enter the gap between the piston and the inner wall of the shell through the guide channel and be discharged through the overflow port. That is, the medium to be measured entering from the guide channel can take away the medium to be measured deposited between the piston and the inner wall of the shell, further achieving the purpose of anti-blocking.

[0059] Optionally, there are multiple overflow ports, which are spaced and evenly arranged along the circumference of the piston, and each overflow port is connected to the opening.

[0060] Optionally, the pressure sensor further includes a blocking portion. Specifically, the blocking portion is disposed on the housing, with at least a portion of the blocking portion located between the overflow port and the piston. Since the overflow port is used to discharge the test medium that has entered the gap between the piston and the inner wall of the housing, the provision of the blocking portion effectively prevents the test medium at the overflow port from entering the gap between the piston and the inner wall of the housing, thereby preventing the test medium from becoming trapped between the piston and the inner wall of the housing and causing the piston to become blocked or stuck, further improving the detection accuracy of the pressure sensor.

[0061] Optionally, a portion of the housing protrudes and extends in a direction away from the pressure detection assembly to form a blocking portion.

[0062] Optionally, the blocking portion includes a limiting surface and a non-return surface. Specifically, along the axial direction of the piston, the limiting surface can be against the piston, thereby limiting the piston in the axial direction to prevent excessive movement of the piston, which is conducive to further realizing the accurate measurement of the medium to be measured by the pressure sensor.

[0063] The check surface is located on the side of the limit surface close to the overflow port, and at least a portion of the check surface is opposite to the overflow port, thereby effectively preventing the medium to be measured at the overflow port from entering the gap between the piston and the inner wall of the shell, avoiding the medium to be measured from being blocked between the piston and the inner wall of the shell, causing the piston movement to be obstructed or stuck, and further improving the detection accuracy of the pressure sensor.

[0064] Optionally, one end of the non-return surface away from the limiting surface extends obliquely in a direction away from the central axis of the piston.

[0065] In some technical solutions, optionally, the tooth structure further includes a plurality of second teeth. Along the axial direction of the piston, the plurality of second teeth are located on the side of the plurality of first teeth close to the pressure detection assembly, and the plurality of second teeth are arranged at intervals along the circumference of the piston.

[0066] In this technical solution, it is defined that the tooth structure also includes multiple second teeth. Specifically, along the axial direction of the piston, the multiple second teeth are located on the side of the multiple first teeth close to the pressure detection component, that is, the multiple second teeth and the multiple first teeth are distributed along the axial direction of the piston.

[0067] Specifically, when the piston moves relative to the housing toward the side away from the pressure detection component, multiple first teeth can be used to cut the viscous mud (the medium to be measured), thereby preventing the mud from being blocked in the gap between the inner wall of the housing and the piston, and ensuring that when the medium to be measured acts on the piston, the piston can be effectively displaced relative to the housing to achieve pressure transmission.

[0068] When the piston moves relative to the housing toward the side close to the pressure detection assembly, multiple second teeth can be used to cut the viscous mud, further avoiding the situation where the piston movement is obstructed or even stuck due to mud compaction and blockage, thereby improving the detection accuracy of the pressure transmitter.

[0069] In some technical solutions, optionally, the pressure detection component includes a pressure core and a circuit board, wherein the circuit board is arranged on the side of the pressure core away from the piston and is electrically connected to the pressure core; the pressure sensor also includes a connector, which is arranged in the shell and is electrically connected to the circuit board for connecting to a host computer.

[0070] In this technical solution, it is defined that the pressure detection component includes a pressure core and a circuit board. Specifically, the circuit board is arranged on the side of the pressure core away from the piston, and the circuit board is electrically connected to the pressure core, and the connector is electrically connected to the circuit board.

[0071] Specifically, when the pressure sensor is installed on the customer's equipment, the pressure of the medium to be measured acts on the piston, causing a slight displacement of the piston (the piston moves axially relative to the housing), squeezing the silicone oil in the oil filling chamber. The silicone oil transmits the pressure to the surface of the pressure core. The pressure core collects and preliminarily processes the pressure signal and sends it to the circuit board. The circuit board converts these signals into the method required by the customer (analog signals: current, voltage; digital signals: CAN (Controller Area Network) and other signal formats), and transmits them to the client's host computer through the connector.

[0072] Optionally, the connector includes a connector body and a cable, wherein the connector body is disposed on the housing, one end of the cable is electrically connected to the circuit board, and the other end of the cable is connected to the host computer. The connector is a waterproof connector, such as an aviation connector.

[0073] Optionally, the pressure detection assembly further includes a pressing piece, which is connected to the inner wall of the shell and abuts against the pressure core to fix the pressure core, and the circuit board is fixedly mounted on the pressing piece.

[0074] Optionally, the shell is further provided with a protective cover, which is provided on the outside of the joint.

[0075] Optionally, the shell includes a cylinder and a flange, the flange and the piston are respectively arranged at the two ends of the cylinder in the axial direction, a sealing ring is provided at the connection between the cylinder and the flange to seal the accommodating cavity, and the joint and the protective cover are arranged on the flange.

[0076] Optionally, the pressure sensor further includes a waterproof breathable valve and a breathable tube.

[0077] Additional aspects and advantages of the present invention will be set forth in part in the following description and, in part, will be obvious from the following description, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0079] Figure 1 Shows one of the structural schematic diagrams of a pressure sensor according to an embodiment of the present invention;

[0080] Figure 2 It shows one of the structural schematic diagrams of a piston according to one embodiment of the present invention;

[0081] Figure 3 A schematic structural diagram of a guide member according to an embodiment of the present invention is shown;

[0082] Figure 4 A second structural schematic diagram of a piston according to an embodiment of the present invention is shown;

[0083] Figure 5 A third structural diagram of a piston according to an embodiment of the present invention is shown;

[0084] Figure 6 A fourth structural diagram of a piston according to an embodiment of the present invention is shown;

[0085] Figure 7 A second structural diagram of a pressure sensor according to an embodiment of the present invention is shown;

[0086] Figure 8 A third structural diagram of a pressure sensor according to an embodiment of the present invention is shown;

[0087] Figure 9 FIG1 shows one of the partial structural schematic diagrams of a pressure sensor according to an embodiment of the present invention;

[0088] Figure 10 FIG2 shows a second partial structural diagram of a pressure sensor according to an embodiment of the present invention;

[0089] Figure 11 FIG3 shows a third partial structural diagram of a pressure sensor according to an embodiment of the present invention.

[0090] in, Figures 1 to 11 The corresponding relationship between the reference numerals and component names is as follows:

[0091] 100 pressure sensor, 110 housing, 111 accommodating chamber, 112 opening, 113 oil filling channel, 120 pressure detection component, 121 pressure core, 122 circuit board, 130 piston, 131 body, 132 transmission part, 140 guide, 141 guide channel, 142 channel wall, 150 oil filling chamber, 160 first oil groove, 170 second oil groove, 180 sealing member, 190 valve body, 210 tooth structure, 211 first tooth, 212 second tooth, 220 joint, 230 overflow port, 240 guide channel. DETAILED DESCRIPTION

[0092] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0093] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0094] Refer to the following Figures 1 to 11 The pressure sensor 100 provided according to some embodiments of the present invention is described below.

[0095] In one embodiment according to the present application, Figure 1 and Figure 3 As shown, a pressure sensor 100 is proposed, which includes: a shell 110, the shell 110 is provided with a connected accommodating chamber 111 and an opening 112; a pressure detection assembly 120, which is arranged in the accommodating chamber 111; a piston 130, which is movably arranged in the accommodating chamber 111, and the end of the piston 130 away from the pressure detection assembly 120 is located at the opening 112, which is used to contact the medium to be measured and can transmit the pressure of the medium to be measured to the pressure detection assembly 120; a guide member 140, which is arranged in the accommodating chamber 111, and the guide member 140 is provided with a guide channel 141, and at least a portion of the piston 130 is located in the guide channel 141 and can move in the guide channel 141.

[0096] The pressure sensor 100 provided in an embodiment of the present invention includes a housing 110 , a pressure detection assembly 120 , a piston 130 and a guide member 140 . Specifically, the housing 110 is provided with a accommodating cavity 111 and an opening 112 , wherein the opening 112 and the accommodating cavity 111 are connected.

[0097] The side of piston 130 facing away from pressure detection assembly 120 is located at opening 112 and is configured to contact the medium to be measured. Specifically, when the pressure of the medium to be measured acts on piston 130, piston 130 is capable of axial movement relative to housing 110, transmitting the pressure to pressure detection assembly 120 via the silicone oil in chamber 111, thereby detecting the pressure of the medium to be measured. It will be appreciated that pressure detection assembly 120 is electrically connected to a host computer on the client side, enabling the pressure value detected by pressure detection assembly 120 to be transmitted to the host computer on the client side. The detected pressure value can be used to maintain the pressure of the mud film at the tunnel excavation face, thereby improving operational safety.

[0098] The guide member 140 is disposed within the accommodating chamber 111 and is provided with a guide channel 141. At least a portion of the piston 130 is movably disposed within the guide channel 141. That is, when the pressure of the medium to be measured acts on the piston 130, at least a portion of the piston 130 moves within the guide channel 141. This supports the piston 130 within the accommodating chamber 111, ensuring that the central axis of the piston 130 is parallel to or coincides with the central axis of the housing 110 when the piston 130 moves relative to the housing 110. This effectively prevents the piston 130 from shifting relative to the housing 110, which in turn causes contact friction between the piston 130 and the inner wall of the housing 110 and hinders its movement. This effectively improves the accuracy of the data output by the pressure sensor 100. Furthermore, this helps reduce wear on the piston 130 and the housing 110, thereby extending the service life of the pressure sensor 100.

[0099] Optionally, the guide member 140 includes a copper member or a linear bearing.

[0100] Optionally, the guide member 140 is a wear-resistant member.

[0101] Optionally, the hardness of the piston 130 is greater than the hardness of the guide member 140, that is, the guide member 140 is softer, which is beneficial to reduce the wear between the piston 130 and the guide member 140 during movement, reduce the resistance encountered by the piston 130, and ensure the output accuracy of the pressure sensor 100.

[0102] like Figure 3 As shown, in some embodiments, optionally, the guide channel 141 includes a channel wall 142 , and the surface roughness of the channel wall 142 is less than 0.8.

[0103] In this embodiment, the surface roughness of the channel wall 142 is limited to less than 0.8, that is, the channel wall 142 is a smooth wall surface, so that the guide member 140 can support the piston 130 and prevent the piston 130 from shifting during movement, while effectively reducing the friction between the piston 130 and the guide member 140, thereby reducing the wear of the piston 130 and the guide member 140 caused by friction, ensuring that the piston 130 is not obstructed when moving axially relative to the housing 110, and improving the output accuracy of the pressure sensor 100.

[0104] In some embodiments, the guide member 140 is optionally made of copper.

[0105] In this embodiment, guide member 140 is defined as copper. As will be appreciated, copper is self-lubricating, thus supporting piston 130 and preventing displacement of piston 130. This effectively reduces friction between piston 130 and guide member 140, thereby reducing friction-induced wear on piston 130 and guide member 140. This ensures unimpeded axial movement of piston 130 relative to housing 110, thereby improving the output accuracy of pressure sensor 100. Furthermore, copper is also highly wear-resistant, extending the service life of guide member 140.

[0106] like Figure 1 、 Figure 2 and Figure 4 As shown, in some embodiments, optionally, part of the inner wall of the housing 110, the end of the piston 130 facing away from the outlet 112, and the pressure detection assembly 120 enclose an oil filling chamber 150; the pressure sensor 100 also includes a first oil groove 160, which is provided on the side of the piston 130 facing away from the outlet 112 and is located between the piston 130 and the inner wall of the housing 110. The first oil groove 160 is connected to the oil filling chamber 150 and extends at least partially along the radial direction of the piston 130.

[0107] In this embodiment, it is defined that the pressure sensor 100 also includes a first oil groove 160. Specifically, a portion of the inner wall of the housing 110, the end of the piston 130 facing away from the outlet 112, that is, the end of the piston 130 facing the pressure detection component 120, and the pressure detection component 120 enclose an oil filling chamber 150. It can be understood that the oil filling chamber 150 is used to accommodate the force transmission medium, that is, silicone oil. Specifically, when the pressure of the medium to be measured acts on the piston 130, the piston 130 can move axially relative to the housing 110 to transmit the pressure to the pressure detection component 120 through the silicone oil in the oil filling chamber 150, thereby realizing the detection of the pressure of the medium to be measured. It can be understood that the oil filling chamber 150 is part of the accommodating chamber 111.

[0108] The first oil groove 160 is arranged on the piston 130, and the first oil groove 160 is located between the piston 130 and the inner wall of the housing 110. That is, the first oil groove 160 is arranged in the gap between the inner wall of the housing 110 and the piston 130, and the first oil groove 160 is connected to the oil filling chamber 150, that is, the silicone oil in the oil filling chamber 150 can partially flow into the first oil groove 160 to fill the gap between the piston 130 and the inner wall of the housing 110, and discharge the air in the gap between the piston 130 and the inner wall of the housing 110, further ensuring that the piston 130 is not obstructed when moving relative to the housing 110, which is conducive to further improving the output accuracy of the pressure sensor 100.

[0109] At least a portion of the first oil groove 160 extends radially along the piston 130, that is, the surface of the piston 130 perpendicular to the central axis of the piston 130 is used to withstand the oil pressure, which is beneficial to ensure that the piston 130 is more stable during axial movement and further improve the detection accuracy of the pressure sensor 100.

[0110] In some embodiments, optionally, there are multiple first oil grooves 160 , and the multiple first oil grooves 160 are arranged at intervals along the circumference of the piston 130 , and each first oil groove 160 is connected to the oil injection chamber 150 .

[0111] In this embodiment, the number of the first oil grooves 160 is limited to multiple. Specifically, the multiple first oil grooves 160 are arranged at intervals along the circumference of the piston 130, and each first oil groove 160 is connected to the oil filling chamber 150 to further fill the gap between the piston 130 and the inner wall of the housing 110, and to discharge the air in the gap between the piston 130 and the inner wall of the housing 110 as much as possible, further ensuring that the piston 130 is not obstructed when moving relative to the housing 110, which is conducive to further improving the output accuracy of the pressure sensor 100.

[0112] Optionally, the plurality of first oil grooves 160 are evenly distributed along the circumferential direction.

[0113] like Figure 3 As shown, in some embodiments, optionally, the pressure sensor 100 further includes a second oil groove 170, which is provided on the side of the guide member 140 facing the piston 130 and extends at least partially along the axial direction of the piston 130. The second oil groove 170 is connected to the guide channel 141, one end of the second oil groove 170 is connected to the oil filling chamber 150, and the other end of the second oil groove 170 is connected to the first oil groove 160.

[0114] In this embodiment, it is defined that the pressure sensor 100 also includes a second oil groove 170. Specifically, the second oil groove 170 is arranged on the side of the guide member 140 facing the piston 130, and the second oil groove 170 is connected to the guide channel 141, that is, the second oil groove 170 is arranged on the radial inner side of the guide member 140.

[0115] Second oil groove 170 extends axially along piston 130, with one end of second oil groove 170 communicating with oil filling chamber 150 and the other end communicating with first oil groove 160. The provision of second oil groove 170 ensures that silicone oil within oil filling chamber 150 can flow through second oil groove 170 into first oil groove 160, thereby filling the gap between piston 130 and the inner wall of housing 110. Furthermore, the provision of second oil groove 170 also fills the gap between guide member 140 and piston 130, further discharging air within accommodating chamber 111, preventing obstruction of piston 130 movement and improving the detection accuracy of pressure sensor 100.

[0116] In some embodiments, optionally, there are multiple second oil grooves 170 , and the multiple second oil grooves 170 are arranged at intervals along the circumference of the piston 130 , and each second oil groove 170 passes through the guide member 140 along the axial direction of the piston 130 .

[0117] In this embodiment, the number of the second oil grooves 170 is limited to multiple. Specifically, the multiple second oil grooves 170 are arranged at intervals along the circumference of the piston 130, so as to ensure that each first oil groove 160 can be quickly filled with silicone oil through the multiple second oil grooves 170, so as to discharge the air in the accommodating cavity 111 as much as possible, prevent the movement of the piston 130 from being obstructed, and help to further improve the output accuracy of the pressure sensor 100.

[0118] Optionally, the plurality of second oil grooves 170 are evenly distributed along the circumferential direction.

[0119] like Figure 1 、 Figure 2 and Figure 4 As shown, in some embodiments, optionally, the piston 130 includes a body 131 and a transfer portion 132, wherein the outer surface of the body 131 is exposed to the opening 112 for contacting the medium to be measured, the first oil groove 160 is provided on the side of the body 131 facing away from the opening 112, the transfer portion 132 is provided on the side of the body 131 facing away from the opening 112, and at least a portion of the transfer portion 132 is located in the guide channel 141.

[0120] In this embodiment, the piston 130 is defined to include a main body 131 and a transmission part 132. Specifically, the outer surface of the main body 131 is exposed to the opening 112. That is, the pressure of the medium to be measured acts on the outer surface of the main body 131, and the transmission part 132 is driven to move by the main body 131 to squeeze the silicone oil in the oil filling chamber 150. The silicone oil transmits the pressure to the pressure detection component 120 to realize the detection of the pressure of the medium to be measured.

[0121] At least a portion of the transmission portion 132 is located in the guide channel 141, that is, the piston 130 is supported at the tail end of the piston 130, effectively avoiding the problem of the piston 130 being obstructed due to contact friction between the piston 130 and the inner wall of the housing 110 due to the displacement of the tail end of the piston 130 when moving relative to the housing 110, thereby effectively improving the accuracy of the output data of the pressure sensor 100.

[0122] Optionally, the main body 131 and the transmission portion 132 are an integrated structure.

[0123] like Figure 1 、 Figure 9 、 Figure 10 and Figure 11 As shown, in some embodiments, optionally, the pressure sensor 100 further includes a seal 180 , which is disposed between the outer wall of the body 131 and the inner wall of the housing 110 .

[0124] In this embodiment, the pressure sensor 100 is defined to further include a seal 180 . Specifically, the seal 180 is disposed between the inner wall of the housing 110 and the outer wall of the piston 130 , thereby sealing the gap between the outer wall of the piston 130 and the inner wall of the housing 110 .

[0125] It is understandable that the piston 130 and the housing 110 themselves have tolerances in manufacturing and processing. When they are assembled and used, when a momentary overload impact occurs, silicone oil leakage is likely to occur.

[0126] By setting a seal 180 between the outer wall of the piston 130 and the inner wall of the housing 110, the accommodating chamber 111 can be effectively sealed to prevent silicone oil leakage and oil pressure changes, thereby ensuring that the piston 130 does not deviate when moving relative to the housing 110, thereby improving the detection accuracy of the pressure sensor 100.

[0127] In addition, the provision of the seal 180 can also provide good support for the piston 130. When the piston 130 moves axially relative to the housing 110, the central axis of the piston 130 can be parallel to or coincide with the central axis of the housing 110. This is beneficial to ensure that the piston 130 does not deviate when moving axially relative to the housing 110, and will not be affected by structural jamming forces, thereby preventing the movement of the piston 130 from being obstructed, which is beneficial to further improve the detection accuracy of the pressure sensor 100.

[0128] Optionally, the seal 180 comprises an O-ring.

[0129] In some embodiments, optionally, the number of the sealing members 180 is at least two, and the at least two sealing members 180 are arranged along the axial direction of the piston 130 .

[0130] In this embodiment, the number of seals 180 is limited to at least two. Specifically, at least two seals 180 are arranged along the axial direction of the piston 130, which is beneficial to further seal the gap between the outer wall of the piston 130 and the inner wall of the housing 110, and further avoid silicone oil leakage.

[0131] At the same time, it can further enhance the supporting effect on the piston 130, so that the central axis of the piston 130 is as parallel or coincident with the central axis of the housing 110 as possible, which is beneficial to ensure that the piston 130 does not deviate during axial movement relative to the housing 110, and will not be affected by structural jamming forces, thereby preventing the movement of the piston 130 from being obstructed, and is beneficial to further enhance the detection accuracy of the pressure sensor 100.

[0132] like Figure 1 、 Figure 7 and Figure 8 As shown, in some embodiments, optionally, the housing 110 is further provided with an oil injection channel 113, which is connected to the oil injection chamber 150; the pressure sensor 100 also includes a valve body 190, which is provided in the oil injection channel 113 for opening or closing the oil injection channel 113.

[0133] In this embodiment, the pressure sensor 100 further includes a valve body 190. Specifically, the oil injection channel 113 is connected to the oil injection chamber 150 for injecting a force transmission medium into the oil injection chamber 150. The force transmission medium includes silicone oil.

[0134] It is understandable that the silicone oil system manufacturing process is generally as follows: the product is placed in a vacuum chamber, and the entire chamber is evacuated. The air in the silicone oil cavity (oil filling cavity 150) inside the product is also extracted to achieve a vacuum state; then, the product is immersed in a silicone oil pool in the vacuum chamber, and the silicone oil fills the oil filling cavity 150 inside the product from the oil filling hole; then, a steel ball is placed in the oil filling hole and welded to the oil filling hole using resistance welding to seal the silicone oil cavity.

[0135] However, there is silicone oil on the surface of the oil filling hole and the steel ball bonding line. During resistance welding, the high temperature will cause the silicone oil to produce gas, so that the oil filling chamber 150 is not entirely filled with silicone oil. Due to the huge difference in compression ratio between liquid silicone oil and gas, even a small amount of gas will affect the linear accuracy of the pressure sensor 100.

[0136] Moreover, the steel ball and the cylinder are welded together. Once a problem with the oil filling is found, if you want to remove the steel ball, re-fill the oil and re-weld it, you have to cut it, which is difficult and usually cannot be repaired, increasing the difficulty and cost of maintenance.

[0137] Specifically, after the oil filling is completed, the oil filling channel 113 is closed by the valve body 190 to prevent silicone oil leakage, which is beneficial to prevent the piston 130 from shifting during axial movement relative to the housing 110. At the same time, it avoids the use of resistance welding to cause gas to be generated in the oil filling chamber 150, thereby improving the detection accuracy of the pressure sensor 100.

[0138] In addition, the valve body 190 can be opened to refill the oil, which helps to reduce the difficulty and cost of maintenance.

[0139] Optionally, the valve body 190 comprises a ball valve.

[0140] Optionally, the pressure sensor 100 further includes a plurality of fixing screws for fixing the valve body 190 .

[0141] like Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 10 and Figure 11 As shown, in some embodiments, optionally, the pressure sensor 100 further includes a toothed structure 210 , which is disposed at an end of the piston 130 facing away from the pressure detection assembly 120 and is at least partially located between the outer wall of the piston 130 and the inner wall of the housing 110 .

[0142] In this embodiment, the pressure sensor 100 is further defined as comprising a toothed structure 210. Specifically, the toothed structure 210 is disposed at an end of the piston 130 facing away from the pressure detection assembly 120, that is, the toothed structure 210 is also located at the opening 112. At least a portion of the toothed structure 210 is disposed between the inner wall of the housing 110 and the outer wall of the piston 130. Thus, when the pressure of the medium to be measured acts on the piston 130, the piston 130 can drive the toothed structure 210 to move relative to the housing 110, thereby cutting the relatively viscous medium to be measured between the piston 130 and the inner wall of the housing 110. This effectively prevents the medium to be measured from hardening or clogging in the gap between the outer wall of the piston 130 and the inner wall of the housing 110, thereby preventing the piston 130 from moving smoothly or being blocked relative to the housing 110. This improves the detection accuracy of the pressure sensor 100, reduces the probability of failure of the pressure sensor 100, and helps ensure the normal operation of the shield machine equipped with the pressure sensor 100, thereby improving operational safety.

[0143] like Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 10 and Figure 11As shown, in some embodiments, optionally, the tooth structure 210 includes a plurality of first teeth 211 , and the plurality of first teeth 211 are arranged at intervals on the outer peripheral side of the piston 130 along the circumference of the piston 130 .

[0144] In this embodiment, it is defined that the tooth structure 210 includes a plurality of first teeth 211. Specifically, along the circumference of the piston 130, the plurality of first teeth 211 are spaced apart on the outer peripheral side of the piston 130. When the pressure of the medium to be measured acts on the piston 130, the piston 130 can drive the tooth structure 210 to move relative to the housing 110, so that the plurality of first teeth 211 can cut the relatively viscous medium to be measured between the piston 130 and the inner wall of the housing 110, effectively preventing the medium to be measured from becoming hardened or blocked in the gap between the outer wall of the piston 130 and the inner wall of the housing 110, thereby preventing the piston 130 from moving poorly or being blocked relative to the housing 110, thereby improving the detection accuracy of the pressure sensor 100 and reducing the probability of failure of the pressure sensor 100.

[0145] like Figure 5 、 Figure 6 、 Figure 9 and Figure 10 As shown, optionally, any two adjacent first teeth 211 and a portion of the outer wall of the piston 130 form a guide channel 240, which is in communication with the opening 112. The housing 110 is further provided with an overflow port 230, which is in communication with the opening 112. It is understood that the overflow port 230 is in communication with the outside, so that the measured medium deposited in the gap between the inner wall of the housing 110 and the piston 130 can be discharged through the overflow port 230, further preventing blockage due to compaction and deposition, which in turn causes obstruction of the movement of the piston 130, thereby improving the detection accuracy of the pressure sensor 100.

[0146] Any two adjacent first teeth 211 and part of the outer wall of the piston 130 enclose a guide channel 240, and the guide channel 240 is connected to the opening 112. When the piston 130 contacts the medium to be measured, the medium to be measured can enter the gap between the piston 130 and the inner wall of the housing 110 through the guide channel 240 and be discharged through the overflow port 230. That is, the medium to be measured entering from the guide channel 240 can take away the medium to be measured deposited between the piston 130 and the inner wall of the housing 110, further achieving the purpose of anti-clogging.

[0147] like Figure 1 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11 As shown, optionally, there are multiple overflow ports 230 , which are spaced and evenly arranged along the circumference of the piston 130 , and each overflow port 230 is in communication with the opening 112 .

[0148] Optionally, the pressure sensor 100 further includes a blocking portion. Specifically, the blocking portion is provided on the housing 110, and at least a portion of the blocking portion is located between the overflow port 230 and the piston 130. Since the overflow port 230 is used to discharge the medium to be measured that has entered between the piston 130 and the inner wall of the housing 110, the provision of the blocking portion can effectively prevent the medium to be measured at the overflow port 230 from entering the gap between the piston 130 and the inner wall of the housing 110, thereby preventing the medium to be measured from being blocked between the piston 130 and the inner wall of the housing 110, thereby preventing the movement of the piston 130 from being obstructed or becoming stuck, thereby further improving the detection accuracy of the pressure sensor 100.

[0149] Optionally, a portion of the housing 110 protrudes and extends in a direction away from the pressure detection assembly 120 to form a blocking portion.

[0150] Optionally, the blocking portion includes a limiting surface and a non-return surface. Specifically, along the axial direction of the piston 130, the limiting surface can be against the piston 130, thereby limiting the piston 130 in the axial direction to prevent excessive movement of the piston 130, which is conducive to further realizing the accurate measurement of the medium to be measured by the pressure sensor 100.

[0151] The check surface is located on the side of the limiting surface close to the overflow port 230, and at least a portion of the check surface is opposite to the overflow port 230, thereby effectively preventing the medium to be measured at the overflow port 230 from entering the gap between the piston 130 and the inner wall of the housing 110, avoiding the medium to be measured from being blocked between the piston 130 and the inner wall of the housing 110, causing the movement of the piston 130 to be obstructed or stuck, and further improving the detection accuracy of the pressure sensor 100.

[0152] Optionally, one end of the non-return surface away from the limiting surface extends obliquely in a direction away from the central axis of the piston 130 .

[0153] like Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 10 and Figure 11 As shown, in some embodiments, optionally, the tooth structure 210 also includes a plurality of second teeth 212. Along the axial direction of the piston 130, the plurality of second teeth 212 are located on the side of the plurality of first teeth 211 close to the pressure detection assembly 120, and the plurality of second teeth 212 are arranged at intervals along the circumference of the piston 130.

[0154] In this embodiment, it is defined that the tooth structure 210 also includes a plurality of second teeth 212. Specifically, along the axial direction of the piston 130, the plurality of second teeth 212 are located on the side of the plurality of first teeth 211 close to the pressure detection assembly 120. That is, the plurality of second teeth 212 and the plurality of first teeth 211 are distributed along the axial direction of the piston 130.

[0155] Specifically, when the piston 130 moves relative to the housing 110 toward the side away from the pressure detection assembly 120, the multiple first teeth 211 can be used to cut the viscous mud (the medium to be measured), thereby preventing the mud from being blocked in the gap between the inner wall of the housing 110 and the piston 130, ensuring that when the medium to be measured acts on the piston 130, the piston 130 can be effectively displaced relative to the housing 110 to achieve pressure transmission.

[0156] When the piston 130 moves relative to the housing 110 toward the side close to the pressure detection assembly 120, multiple second teeth 212 can be used to cut the viscous mud, further avoiding the situation where the movement of the piston 130 is obstructed or even stuck due to mud compaction and blockage, thereby improving the detection accuracy of the pressure transmitter.

[0157] like Figure 1 As shown, in some embodiments, optionally, the pressure detection component 120 includes a pressure core 121 and a circuit board 122, wherein the circuit board 122 is arranged on the side of the pressure core 121 away from the piston 130 and is electrically connected to the pressure core 121; the pressure sensor 100 also includes a connector 220, which is arranged in the housing 110 and is electrically connected to the circuit board 122 for connecting to a host computer.

[0158] In this embodiment, the pressure detection assembly 120 is defined to include a pressure core 121 and a circuit board 122. Specifically, the circuit board 122 is arranged on the side of the pressure core 121 away from the piston 130, and the circuit board 122 is electrically connected to the pressure core 121, and the connector 220 is electrically connected to the circuit board 122.

[0159] Specifically, when the pressure sensor 100 is installed on the customer's equipment, the pressure of the medium to be measured acts on the piston 130, and the piston 130 undergoes a slight displacement (the piston 130 moves axially relative to the housing 110), squeezing the silicone oil in the oil filling chamber 150. The silicone oil transmits the pressure to the surface of the pressure core 121. The pressure core 121 collects and preliminarily processes the pressure signal and sends it to the circuit board 122. The circuit board 122 converts these signals into the method required by the customer (analog signals: current, voltage; digital signals: CAN (Controller Area Network) and other signal formats), and transmits them to the client's host computer through the connector 220.

[0160] Optionally, the connector 220 includes a connector body and a cable, wherein the connector body is disposed on the housing 110, one end of the cable is electrically connected to the circuit board 122, and the other end of the cable is connected to the host computer.

[0161] Optionally, the pressure detection assembly 120 further includes a pressing piece, which is connected to the inner wall of the housing 110 and abuts against the pressure core 121 to fix the pressure core 121 , and the circuit board 122 is fixedly mounted on the pressing piece.

[0162] Optionally, the housing 110 is further provided with a protective cover, which is provided on the outside of the connector 220 .

[0163] Optionally, the shell 110 includes a cylinder and a flange, the flange and the piston 130 are respectively arranged at the two ends of the cylinder in the axial direction, and a sealing ring is provided at the connection between the cylinder and the flange to seal the accommodating chamber 111, and the joint 220 and the protective cover are arranged on the flange.

[0164] Optionally, the pressure sensor 100 further includes a waterproof breathable valve and a breathable tube.

[0165] In this specification, the terms "connect," "install," and "fix" should be understood broadly. For example, "connect" can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a direct connection or an indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0166] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0167] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A pressure sensor, characterized in that: include: A housing, wherein the housing is provided with a communicating accommodation cavity and an opening; A pressure detection component is disposed in the accommodating cavity; a piston movably disposed in the accommodating chamber, wherein one end of the piston facing away from the pressure detection assembly is located at the opening, and is configured to contact the medium to be measured and transmit the pressure of the medium to be measured to the pressure detection assembly; a guide member disposed in the accommodating cavity, the guide member being provided with a guide channel, at least a portion of the piston being located in the guide channel and being able to move in the guide channel; The tooth-shaped structure is provided at an end of the piston away from the pressure detection assembly and is at least partially located between the outer wall of the piston and the inner wall of the housing.

2. The pressure sensor according to claim 1, wherein The guide channel includes a channel wall, and the surface roughness of the channel wall is less than 0.

8.

3. The pressure sensor according to claim 1, wherein The guide member is made of copper.

4. The pressure sensor according to any one of claims 1 to 3, characterized in that A portion of the inner wall of the housing, an end of the piston facing away from the opening, and the pressure detection assembly enclose an oil filling chamber; The pressure sensor further comprises: The first oil groove is provided on a side of the piston away from the opening and is located between the piston and the inner wall of the housing. The first oil groove is communicated with the oil filling cavity and extends at least partially along the radial direction of the piston.

5. The pressure sensor according to claim 4, characterized in that There are multiple first oil grooves, and the multiple first oil grooves are arranged at intervals along the circumference of the piston. Each of the first oil grooves is connected to the oil injection chamber.

6. The pressure sensor according to claim 4, characterized in that Also includes: A second oil groove is provided on the side of the guide member facing the piston and extends at least partially along the axial direction of the piston. The second oil groove is connected to the guide channel, one end of the second oil groove is connected to the oil filling chamber, and the other end of the second oil groove is connected to the first oil groove.

7. The pressure sensor according to claim 6, characterized in that There are multiple second oil grooves, and the multiple second oil grooves are arranged at intervals along the circumference of the piston. Each second oil groove passes through the guide member along the axial direction of the piston.

8. The pressure sensor according to claim 4, wherein: The piston comprises: a body, wherein the outer surface of the body is exposed at the opening and is used to contact the medium to be measured, and the first oil tank is provided on a side of the body away from the opening; The transmission portion is arranged on a side of the main body away from the opening, and at least a portion of the transmission portion is located in the guide channel.

9. The pressure sensor according to claim 8, characterized in that Also includes: a sealing member, disposed between the outer wall of the body and the inner wall of the shell; There are at least two sealing members, and at least two of the sealing members are arranged along the axial direction of the piston.

10. The pressure sensor according to claim 4, wherein The housing is further provided with an oil injection channel, the oil injection channel being in communication with the oil injection chamber; The pressure sensor further comprises: The valve body is arranged in the oil injection channel and is used for opening or closing the oil injection channel.

11. The pressure sensor according to any one of claims 1 to 3, characterized in that The tooth structure comprises: a plurality of first teeth, the plurality of first teeth being arranged at intervals along the circumference of the piston on the outer circumference of the piston; A plurality of second teeth are arranged along the axial direction of the piston, the plurality of second teeth are located on a side of the plurality of first teeth close to the pressure detection assembly, and the plurality of second teeth are spaced apart along the circumference of the piston.

Images