Pressure transmitter

Abstract

The present invention provides a pressure transmitter, which includes: a housing having a cavity and an opening communicating with each other; a pressure detection member disposed in the cavity for detecting the pressure of a medium to be measured; a force receiving member disposed in the cavity and capable of moving relative to the housing along the axial direction of the force receiving member, and one end of the force receiving member facing away from the pressure detection member is located at the opening for contacting the medium to be measured and capable of transmitting the pressure of the medium to be measured to the pressure detection member; a tooth-shaped structure disposed at one end of the force receiving member facing away from the pressure detection member and at least partially disposed between the inner wall of the housing at the opening and the outer wall of the force receiving member. When the pressure of the medium to be measured acts on the force receiving member, the force receiving member can drive the tooth-shaped structure to move relative to the housing so as to cut the relatively viscous medium to be measured located between the force receiving member and the inner wall of the housing, effectively avoiding the agglomeration and blockage of the medium to be measured in the gap between the outer wall of the force receiving member and the inner wall of the housing.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure detection, and more particularly to a pressure transmitter. Background Art

[0002] Currently, in the related art, in the shield machine industry, the pressure transmitter used to measure the pressure of the slurry in the soil bin is generally a silicone oil piston type pressure transmitter. When detecting the pressure of the slurry, the pressure of the slurry acts on the piston, the piston squeezes the silicone oil filled in the cavity, and then the silicone oil transfers the pressure to the pressure core to achieve the detection of the slurry pressure.

[0003] However, the gap between the piston and the cylinder body is easily blocked by the slurry, resulting in poor or blocked movement of the piston, causing the linearity of the pressure transmitter to deteriorate, reducing the output accuracy, and even causing the piston to be stuck, resulting in the failure of the pressure transmitter and affecting the operation safety. 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 the embodiments of the present invention provides a pressure transmitter.

[0006] In view of this, according to the first aspect of the embodiments of the present invention, a pressure transmitter is provided, which includes: a housing having a cavity and an opening communicating therewith; a pressure detection member disposed in the cavity for detecting the pressure of a medium to be measured; a force receiving member disposed in the cavity and capable of moving relative to the housing along the axial direction of the force receiving member, one end of the force receiving member facing away from the pressure detection member is located at the opening for contacting the medium to be measured and capable of transmitting the pressure of the medium to be measured to the pressure detection member; and a toothed structure disposed at one end of the force receiving member facing away from the pressure detection member and at least partially disposed between the inner wall of the housing at the opening and the outer wall of the force receiving member.

[0007] The pressure transmitter provided by the embodiments of the present invention includes a housing, a pressure detection member, a force receiving member, and a toothed structure. Specifically, the pressure detection member can detect the pressure of the medium to be measured. Among them, the medium to be measured includes the slurry in the soil bin.

[0008] It can be understood that for the shield machine to work properly, it mainly depends on the establishment and maintenance of the mud film on the tunnel excavation face. The slurry in the soil bin is used to establish the mud film and provide the pressure to maintain the mud film. Once the pressure of the mud film on the excavation face is lost, it will cause the collapse and piping of the excavation face, and in severe cases, it will silt up the entire tunnel and even cause the overall collapse of the tunnel, resulting in huge economic losses and threatening the lives and safety of the staff. Among them, the shield machine includes an earth pressure shield machine, a slurry shield machine, or a double-mode shield machine.

[0009] The force-receiving member is disposed within the cavity, and the end of the force-receiving member away from the pressure detecting member is located at the opening. That is to say, the end of the force-receiving member away from the pressure detecting member is exposed outside the opening for contacting the medium to be measured.

[0010] Specifically, the pressure of the medium to be measured acts on the force-receiving member, and the force-receiving member transmits the pressure to the pressure detecting member so as to detect the pressure of the medium to be measured first. Optionally, silicone oil is accommodated between the force-receiving member and the pressure detecting member. When the pressure of the medium to be measured acts on the force-receiving member, the force-receiving member generates a small displacement and squeezes the silicone oil, and the silicone oil transmits the pressure to the pressure detecting member.

[0011] It can be understood that since the force-receiving member directly contacts the medium to be measured and can generate displacement under the action of the medium to be measured, that is to say, the force-receiving member can move relative to the housing to achieve the transmission of the pressure of the medium to be measured. When using a pressure transmitter to detect a medium to be measured such as mud with sand and gravel, the mud is easily blocked between the outer wall of the force-receiving member and the inner wall of the housing, resulting in the movement of the force-receiving member being blocked or stuck, reducing the detection accuracy of the pressure transmitter, and even causing the pressure transmitter to fail.

[0012] A tooth-shaped structure is provided at the end of the force-receiving member away from the pressure detecting member. That is to say, the tooth-shaped structure is also located at the opening. At least a part of the tooth-shaped structure is disposed between the inner wall of the housing at the opening and the outer wall of the force-receiving member. Thus, when the pressure of the medium to be measured acts on the force-receiving member, the force-receiving member can drive the tooth-shaped structure to move relative to the housing to cut the relatively viscous medium to be measured located between the force-receiving member and the inner wall of the housing, effectively avoiding the agglomeration and blockage of the medium to be measured in the gap between the outer wall of the force-receiving member and the inner wall of the housing, and further avoiding the situation that the movement of the force-receiving member relative to the housing is not smooth or blocked, improving the detection accuracy of the pressure transmitter, reducing the probability of the pressure transmitter failing, being beneficial to ensuring the normal operation of the shield machine with the pressure transmitter, and improving the operation safety.

[0013] In addition, the pressure transmitter provided according to the above technical solution of the present invention further has the following additional technical features:

[0014] In some technical solutions, optionally, the tooth-shaped structure includes a plurality of first tooth portions, and the plurality of first tooth portions are arranged at intervals along the circumferential direction of the force-receiving member on the outer peripheral side of the force-receiving member.

[0015] In this technical solution, it is defined that the tooth-shaped structure includes a plurality of first tooth portions. Specifically, along the circumference of the force-bearing member, a plurality of first tooth portions are arranged at intervals on the outer peripheral side of the force-bearing member. When the pressure of the medium to be measured acts on the force-bearing member, the force-bearing member can drive the tooth-shaped structure to move relative to the shell, so that the plurality of first tooth portions can cut the more viscous medium to be measured between the force-bearing member and the inner wall of the shell, effectively avoiding the hardening and blockage of the medium to be measured in the gap between the outer wall of the force-bearing member and the inner wall of the shell, thereby avoiding the situation where the force-bearing member moves poorly or is blocked relative to the shell, thereby improving the detection accuracy of the pressure transmitter and reducing the probability of failure of the pressure transmitter.

[0016] In some technical solutions, optionally, at least one first tooth portion can be in contact with an inner wall of the housing at the opening.

[0017] In this technical solution, at least one first tooth portion can contact the inner wall of the shell at the opening, so that when the pressure of the medium to be measured acts on the force-bearing member, when the force-bearing member drives the toothed structure to move relative to the shell, at least one first tooth portion can generate sliding friction with the inner wall of the shell, thereby improving the cutting effect on the viscous medium deposited or entering between the force-bearing member and the inner wall of the shell, and further avoiding the viscous medium from being hardened and blocked between the inner wall of the shell of the force-bearing member.

[0018] In some technical solutions, optionally, along the axial direction of the force-bearing member, at least one first tooth portion includes a first end and a second end opposite to each other, and the first end is farther away from the pressure detection member than the second end; wherein, along the circumferential direction of the force-bearing member, the width of the first end is smaller than the width of the second end.

[0019] In this technical solution, it is defined that at least one first tooth portion includes a first end and a second end, the first end and the second end are opposite to each other along the axial direction of the force-bearing member, and the first end is farther away from the pressure detection member than the second end, that is, the first end faces outward.

[0020] Since the circumferential width of the first end is smaller than the circumferential width of the second end, at least one first tooth portion is formed into a plowshare structure similar to that on a tilling machine. When the pressure of the medium to be measured acts on the force-bearing member, the force-bearing member drives the toothed structure to move relative to the shell, thereby effectively plowing open the viscous medium, improving the cutting effect on the viscous medium deposited or entering between the force-bearing member and the inner wall of the shell, and further avoiding the viscous medium from being compacted and blocked between the inner wall of the shell of the force-bearing member.

[0021] In some technical solutions, optionally, any two adjacent first teeth and a portion of the outer wall of the force-bearing member form a guide channel, and the guide channel is connected to the opening; the shell is also provided with an overflow port, and the overflow port is connected to the opening.

[0022] In this technical solution, it is defined that the housing is further provided with an overflow port. Specifically, the overflow port is communicated with the opening. It can be understood that the overflow port is communicated with the outside, so that the measured medium deposited in the gap between the inner wall of the housing and the force-bearing member can be discharged through the overflow port, further preventing blockage caused by caking and deposition, and further avoiding the situation that the movement of the force-bearing member is blocked, thereby improving the detection accuracy of the pressure transmitter.

[0023] Any two adjacent first tooth portions and a part of the outer wall of the force-bearing member enclose a diversion channel, and the diversion channel is communicated with the opening. When the force-bearing member contacts the measured medium, the measured medium can enter the gap between the force-bearing member and the inner wall of the housing through the diversion channel and be discharged through the overflow port, that is, the measured medium entering from the diversion channel can take away the measured medium deposited between the force-bearing member and the inner wall of the housing, further achieving the purpose of anti-blocking.

[0024] Optionally, the number of the overflow ports is multiple, and the multiple overflow ports are spaced and evenly arranged along the circumferential direction of the force-bearing member, and each overflow port is communicated with the opening.

[0025] In some technical solutions, optionally, a diversion surface is provided on the outer wall of the force-bearing member, and the diversion surface and any two adjacent first tooth portions form a diversion channel; wherein, one end of the diversion surface far away from the pressure detection member extends obliquely towards the side where the central axis of the force-bearing member is located.

[0026] In this technical solution, it is defined that a diversion surface is provided on the outer wall of the force-bearing member. Specifically, the diversion surface is an inclined surface, which is beneficial to guiding the measured medium to the gap between the force-bearing member and the inner wall of the housing through the diversion channel, and further can wash away the measured medium accumulated in the gap between the force-bearing member and the inner wall of the housing through the overflow port, improving the anti-blocking effect.

[0027] In some technical solutions, optionally, the pressure transmitter further includes a blocking portion, and the blocking portion is arranged on the housing and at least partially located between the overflow port and the force-bearing member.

[0028] In this technical solution, it is defined that the pressure transmitter further includes a blocking portion. Specifically, the blocking portion is arranged on the housing, and at least a part of the blocking portion is located between the overflow port and the force-bearing member. Since the overflow port is used to discharge the measured medium entering the gap between the force-bearing member and the inner wall of the housing, by providing the blocking portion, the measured medium at the overflow port can be effectively blocked from entering the gap between the force-bearing member and the cavity wall, avoiding the measured medium from being blocked between the force-bearing member and the cavity wall, resulting in the movement of the force-bearing member being blocked or stuck, and further improving the detection accuracy of the pressure transmitter.

[0029] Optionally, a part of the housing protrudes and extends in a direction away from the pressure detection member to form the blocking portion.

[0030] In some technical solutions, optionally, the blocking portion includes a limiting surface and a backflow preventing surface. Along the axial direction of the force-bearing member, the limiting surface can abut against the force-bearing member, and the backflow preventing surface is connected to one side of the limiting surface close to the overflow port and at least partially faces the overflow port.

[0031] In this technical solution, it is defined that the blocking portion includes a limiting surface and a backflow preventing surface. Specifically, along the axial direction of the force-bearing member, the limiting surface can abut against the force-bearing member, thereby limiting the force-bearing member axially to prevent the force-bearing member from moving excessively, which is beneficial to further realizing the accurate measurement of the pressure transmitter for the medium to be measured.

[0032] The backflow preventing surface is located on the side of the limiting surface close to the overflow port, and at least a part of the backflow preventing surface faces the overflow port, so that the medium to be measured at the overflow port can be effectively blocked from entering the gap between the force-bearing member and the cavity wall, avoiding the medium to be measured being blocked between the force-bearing member and the cavity wall, resulting in the movement of the force-bearing member being blocked or jammed, and further improving the detection accuracy of the pressure transmitter.

[0033] In some technical solutions, optionally, the end of the backflow preventing surface away from the limiting surface extends obliquely in a direction away from the central axis of the force-bearing member.

[0034] In this technical solution, it is defined that the backflow preventing surface is an inclined surface, which is beneficial to further blocking the medium to be measured at the overflow port from entering the gap between the force-bearing member and the cavity wall, avoiding the medium to be measured being blocked between the force-bearing member and the cavity wall, resulting in the movement of the force-bearing member being blocked or jammed, and further improving the detection accuracy of the pressure transmitter.

[0035] In some technical solutions, optionally, the force-bearing member is provided with a mating groove, and at least a part of the blocking portion is located in the mating groove; wherein, the mating groove is provided with a mating surface, and at least a part of the mating surface is in contact with the backflow preventing surface.

[0036] In this technical solution, it is defined that the force-bearing member is provided with a mating groove. Specifically, at least a part of the blocking portion is located in the mating groove, which is beneficial to improving the limiting effect on the axial movement of the force-bearing member. At the same time, it is also beneficial to limit the force-bearing member radially. When the force-bearing member moves relative to the housing, it can prevent the force-bearing member from moving offset, which is beneficial to further improving the detection accuracy.

[0037] The mating groove is provided with a mating surface, and at least a part of the mating surface is in contact with the backflow preventing surface, so that the medium to be measured can be further blocked from entering the gap between the force-bearing member and the cavity wall, avoiding the medium to be measured being blocked between the force-bearing member and the cavity wall, resulting in the movement of the force-bearing member being blocked or jammed.

[0038] In some technical solutions, optionally, the pressure transmitter further includes a sealing member, and the sealing member is arranged between the cavity wall of the cavity and the force-bearing member.

[0039] In this technical solution, it is defined that the pressure transmitter further includes a seal. Specifically, the seal is arranged between the cavity wall of the cavity and the force-receiving member, thereby sealing the gap between the force-receiving member and the cavity wall of the cavity.

[0040] It can be understood that there are manufacturing and processing tolerances in the force-receiving member and the housing itself. When in use after assembly, when there is an instantaneous overload impact, silicone oil leakage is likely to occur.

[0041] By arranging a seal between the force-receiving member and the cavity wall of the cavity, effective sealing of the cavity can be achieved, preventing silicone oil leakage from causing oil pressure fluctuations. Furthermore, it can ensure that the force-receiving member does not shift when moving relative to the housing, improving the detection accuracy of the pressure transmitter.

[0042] In addition, arranging the seal can also provide good support for the force-receiving member, making the central axis of the force-receiving member parallel or coincident with the central axis of the housing, which is beneficial to ensuring that the force-receiving member does not shift when moving axially relative to the housing, not being subject to structural jamming forces, preventing the movement of the force-receiving member from being blocked, and further improving the detection accuracy of the pressure transmitter.

[0043] Optionally, the seal includes an O-ring.

[0044] In some technical solutions, optionally, the number of seals is at least two, and the at least two seals are arranged axially along the force-receiving member.

[0045] In this technical solution, it is defined that the number of seals is at least two. Specifically, the at least two seals are arranged axially along the force-receiving member, which is beneficial to further sealing the gap between the force-receiving member and the cavity wall of the cavity and further avoiding silicone oil leakage.

[0046] At the same time, it can further improve the support effect on the force-receiving member, making the central axis of the force-receiving member as parallel or coincident as possible with the central axis of the housing, which is beneficial to ensuring that the force-receiving member does not shift when moving axially relative to the housing, not being subject to structural jamming forces, preventing the movement of the force-receiving member from being blocked, and further improving the detection accuracy of the pressure transmitter.

[0047] In some technical solutions, optionally, the tooth-shaped structure further includes a plurality of second tooth parts. Along the axial direction of the force-receiving member, the plurality of second tooth parts are located on the side of the plurality of first tooth parts close to the pressure detection member, and the plurality of second tooth parts are arranged at intervals along the circumferential direction of the force-receiving member.

[0048] In this technical solution, it is defined that the tooth-shaped structure further includes a plurality of second tooth parts. Specifically, along the axial direction of the force-receiving member, the plurality of second tooth parts are located on the side of the plurality of first tooth parts close to the pressure detection member. That is to say, the plurality of second tooth parts and the plurality of first tooth parts are axially distributed along the force-receiving member.

[0049] Specifically, when the force-receiving member moves away from the pressure detecting member relative to the housing, multiple first tooth portions can be used to cut the viscous mud (the medium to be measured), thereby preventing the mud from clogging in the gap between the inner wall of the housing and the force-receiving member, ensuring that when the medium to be measured acts on the force-receiving member, the force-receiving member can effectively displace relative to the housing to achieve pressure transmission.

[0050] When the force-receiving member moves closer to the pressure detecting member relative to the housing, multiple second tooth portions can be used to cut the viscous mud, further preventing the force-receiving member from being blocked or even stuck due to mud hardening and clogging, and improving the detection accuracy of the pressure transmitter.

[0051] In some technical solutions, optionally, one end of the force-receiving member facing the pressure detecting member, a partial cavity wall of the housing, and the pressure detecting member enclose a detection cavity, and the housing is further provided with an injection channel communicating with the detection cavity; the pressure transmitter further includes a switching valve provided at one end of the injection channel facing away from the detection cavity for opening or closing the injection channel.

[0052] In this technical solution, it is defined that the pressure transmitter further includes a switching valve. Specifically, the injection channel communicates with the detection cavity for injecting a force-transmitting medium into the detection cavity. Among them, the force-transmitting medium includes silicone oil.

[0053] It can be understood that the manufacturing process of the silicone oil system is generally as follows: the product is placed in a vacuum chamber, and the whole is evacuated. The air in the silicone oil cavity (detection cavity) inside the product is also evacuated to reach a vacuum state; then, the product is immersed in a silicone oil pool in the vacuum chamber, and the silicone oil fills the cavity inside the product from the oil injection hole; subsequently, a steel ball is placed at the oil injection hole, and the steel ball is welded to the oil injection hole by resistance welding to seal the silicone oil cavity.

[0054] However, there is silicone oil on the surface of the fitting line between the oil injection hole and the steel ball. During resistance welding, high temperature will cause the silicone oil to generate gas, resulting in the detection cavity not being completely filled with silicone oil. Since the compression ratios of liquid silicone oil and gas are vastly different, even a small amount of gas will affect the linear accuracy of the pressure transmitter.

[0055] Moreover, the steel ball is welded to the cylinder body. Once it is found that there is a problem with oil injection and the steel ball needs to be removed for re-injection and re-welding, cutting is required, which is difficult and usually irreparable, increasing the maintenance difficulty and cost.

[0056] Specifically, after the oil injection is completed, the injection channel is closed by the switching valve to prevent silicone oil leakage, which is beneficial to preventing the force-receiving member from shifting during the axial movement relative to the housing. At the same time, it avoids the generation of gas in the detection cavity caused by resistance welding, and improves the detection accuracy of the pressure transmitter.

[0057] In addition, re-oiling can be achieved by opening the switch valve, which helps to reduce maintenance difficulty and cost.

[0058] Optionally, the switching valve comprises a ball valve.

[0059] Optionally, the pressure transmitter further comprises a plurality of fixing screws for fixing the switch valve.

[0060] In some technical schemes, 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 force-bearing component and is electrically connected to the pressure core; the pressure transmitter also includes a connector, which is arranged in the shell and is electrically connected to the circuit board for connecting to a host computer.

[0061] 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 force-bearing component, and the circuit board is electrically connected to the pressure core, and the connector is electrically connected to the circuit board.

[0062] Specifically, when the pressure transmitter is installed on the customer's equipment, the pressure of the medium to be measured acts on the load-bearing part, which undergoes a slight displacement and squeezes the silicone oil in the detection cavity. The silicone oil transmits the pressure to the surface of the pressure core. The pressure core collects and preliminarily processes the pressure signal and then sends it to the circuit board. The circuit board converts these signals into the form required by the customer (analog signals: current, voltage; digital signals: various signal formats such as CAN (Controller Area Network)), and transmits them to the client's host computer through a connector.

[0063] Optionally, the connector includes a connector body and a cable, the connector body is arranged 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, for example, an aviation connector.

[0064] Optionally, the pressure detection component further includes a pressing component, which is connected to the cavity wall of the cavity and abuts against the pressure core to fix the pressure core, and the circuit board is fixedly mounted on the pressing component.

[0065] Optionally, the shell is further provided with a protective cover, and the protective cover is provided on the outside of the joint.

[0066] Optionally, the shell includes a shell body and a flange, the flange and the force-bearing member are respectively arranged at two ends of the shell body in the axial direction, a sealing ring is arranged at the connection between the shell body and the flange to seal the cavity, and the joint and the protective cover are arranged on the flange.

[0067] Optionally, the pressure transmitter also includes a waterproof breathable valve and a breathable tube.

[0068] Additional aspects and advantages of the present invention will be given in the following description section, some will become apparent from the following description, or be learned through the practice of the present invention. Brief Description of the Drawings

[0069] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, wherein:

[0070] Figure 1 FIG. 1 shows one of the schematic structural diagrams of a pressure transmitter according to an embodiment of the present invention;

[0071] Figure 2 FIG. 2 shows another schematic structural diagram of a pressure transmitter according to an embodiment of the present invention;

[0072] Figure 3 FIG. 3 shows still another schematic structural diagram of a pressure transmitter according to an embodiment of the present invention;

[0073] Figure 4 FIG. 4 shows one of the schematic structural diagrams of a force-receiving member according to an embodiment of the present invention;

[0074] Figure 5 FIG. 5 shows another schematic structural diagram of a force-receiving member according to an embodiment of the present invention;

[0075] Figure 6 FIG. 6 shows still another schematic structural diagram of a force-receiving member according to an embodiment of the present invention;

[0076] Figure 7 FIG. 7 shows yet another schematic structural diagram of a force-receiving member according to an embodiment of the present invention;

[0077] Figure 8 FIG. 8 shows one of the schematic partial structural diagrams of a pressure transmitter according to an embodiment of the present invention;

[0078] Figure 9 FIG. 9 shows another schematic partial structural diagram of a pressure transmitter according to an embodiment of the present invention;

[0079] Figure 10 FIG. 10 shows still another schematic partial structural diagram of a pressure transmitter according to an embodiment of the present invention;

[0080] Figure 11 FIG. 11 shows the schematic structural diagram of a guide member according to an embodiment of the present invention.

[0081] Wherein, Figures 1 to 11 the corresponding relationship between the reference numerals in the drawings and the component names is as follows:

[0082] 100 Pressure transmitter, 110 housing, 111 cavity, 112 opening, 113 inner wall, 114 overflow port, 115 injection channel, 120 pressure detection component, 121 pressure core, 122 circuit board, 130 force-bearing component, 131 outer wall, 132 guiding surface, 133 mating groove, 134 mating surface, 140 toothed structure, 141 first tooth portion, 142 first end, 143 second end, 144 second tooth portion, 150 guiding channel, 160 blocking portion, 161 limiting surface, 162 anti-backflow surface, 170 seal, 180 detection cavity, 190 switching valve, 210 connector, 220 guiding component, 221 guiding channel, 230 first oil groove, 240 second oil groove. Detailed implementation manners

[0083] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0084] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0085] The following refers to Figures 1 to 11 to describe the pressure transmitter 100 provided according to some embodiments of the present invention.

[0086] In an embodiment according to the present application, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 shown, a pressure transmitter 100 is proposed. The pressure transmitter 100 includes: a housing 110, the housing 110 is provided with a cavity 111 and an opening 112 that are connected and communicated; a pressure detection component 120, disposed in the cavity 111, and used for detecting the pressure of the medium to be measured; a force-bearing component 130, disposed in the cavity 111, and capable of moving relative to the housing 110 along the axial direction of the force-bearing component 130. One end of the force-bearing component 130 facing away from the pressure detection component 120 is located at the opening 112, and is used for contacting the medium to be measured and capable of transmitting the pressure of the medium to be measured to the pressure detection component 120; a toothed structure 140, disposed at one end of the force-bearing component 130 facing away from the pressure detection component 120, and at least partially disposed between the inner wall 113 of the housing 110 at the opening 112 and the outer wall 131 of the force-bearing component 130.

[0087] The pressure transmitter 100 provided by the embodiment of the present invention includes a housing 110, a pressure detection member 120, a force-receiving member 130, and a toothed structure 140. Specifically, the pressure detection member 120 can detect the pressure of the medium to be measured. Among them, the medium to be measured includes the slurry in the soil bin.

[0088] It can be understood that for the normal operation of the shield machine, the establishment and pressure maintenance of the mud film on the tunnel excavation face are crucial. The slurry in the soil bin is used to establish the mud film and provide the pressure to maintain it. Once the pressure of the mud film on the excavation face is lost, it will cause the collapse and piping of the excavation face. In severe cases, it will silt up the entire tunnel and even cause the overall collapse of the tunnel, resulting in huge economic losses and threatening the lives and safety of the staff. Among them, the shield machine includes an earth pressure shield machine, a slurry shield machine, or a double-mode shield machine.

[0089] The force-receiving member 130 is arranged in the cavity 111, and one end of the force-receiving member 130 away from the pressure detection member 120 is located at the opening 112. That is to say, one end of the force-receiving member 130 away from the pressure detection member 120 is exposed outside the opening 112 for contacting the medium to be measured.

[0090] Specifically, the pressure of the medium to be measured acts on the force-receiving member 130, and the force-receiving member 130 transmits the pressure to the pressure detection member 120 so as to detect the pressure of the medium to be measured first. Optionally, silicone oil is accommodated between the force-receiving member 130 and the pressure detection member 120. After the pressure of the medium to be measured acts on the force-receiving member 130, the force-receiving member 130 generates a small displacement and squeezes the silicone oil, and the silicone oil transmits the pressure to the pressure detection member 120.

[0091] It can be understood that since the force-receiving member 130 directly contacts the medium to be measured and can generate displacement under the action of the medium to be measured, that is to say, the force-receiving member 130 can move relative to the housing 110 to realize the transmission of the pressure of the medium to be measured. When using the pressure transmitter 100 to detect the medium to be measured such as slurry with sand and gravel, the slurry is easily blocked between the outer wall 131 of the force-receiving member 130 and the inner wall 113 of the housing 110, resulting in the movement of the force-receiving member 130 being blocked or stuck, reducing the detection accuracy of the pressure transmitter 100, and even causing the pressure transmitter 100 to fail.

[0092] One end of the force-receiving member 130 away from the pressure detecting member 120 is provided with a toothed structure 140. That is to say, the toothed structure 140 is also located at the opening 112. At least a part of the toothed structure 140 is arranged between the inner wall 113 of the housing 110 at the opening 112 and the outer wall 131 of the force-receiving member 130. Thus, when the pressure of the medium to be measured acts on the force-receiving member 130, the force-receiving member 130 can drive the toothed structure 140 to move relative to the housing 110, so as to cut the relatively viscous medium to be measured located between the force-receiving member 130 and the inner wall 113 of the housing 110, effectively avoiding the agglomeration and blockage of the medium to be measured in the gap between the outer wall 131 of the force-receiving member 130 and the inner wall 113 of the housing 110, and further avoiding the situation that the force-receiving member 130 moves smoothly or is blocked relative to the housing 110, improving the detection accuracy of the pressure transmitter 100, reducing the probability of failure of the pressure transmitter 100, being beneficial to ensuring the normal operation of the shield machine with the pressure transmitter 100, and improving the operation safety.

[0093] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, in some embodiments, optionally, the toothed structure 140 includes a plurality of first tooth portions 141, and the plurality of first tooth portions 141 are arranged at intervals along the circumferential direction of the force-receiving member 130 on the outer peripheral side of the force-receiving member 130.

[0094] In this embodiment, it is defined that the toothed structure 140 includes a plurality of first tooth portions 141. Specifically, along the circumferential direction of the force-receiving member 130, the plurality of first tooth portions 141 are arranged at intervals on the outer peripheral side of the force-receiving member 130. When the pressure of the medium to be measured acts on the force-receiving member 130, the force-receiving member 130 can drive the toothed structure 140 to move relative to the housing 110, so that the plurality of first tooth portions 141 can cut the relatively viscous medium to be measured located between the force-receiving member 130 and the inner wall 113 of the housing 110, effectively avoiding the agglomeration and blockage of the medium to be measured in the gap between the outer wall 131 of the force-receiving member 130 and the inner wall 113 of the housing 110, and further avoiding the situation that the force-receiving member 130 moves smoothly or is blocked relative to the housing 110, improving the detection accuracy of the pressure transmitter 100, and reducing the probability of failure of the pressure transmitter 100.

[0095] In some embodiments, optionally, at least one first tooth portion 141 can be in contact with the inner wall 113 of the housing 110 at the opening 112.

[0096] In this embodiment, at least one first tooth portion 141 can be in contact with the inner wall 113 of the housing 110 at the opening 112. Thus, when the pressure of the medium to be measured acts on the force-receiving member 130 and the force-receiving member 130 drives the toothed structure 140 to move relative to the housing 110, a sliding friction can be generated between at least one first tooth portion 141 and the inner wall 113 of the housing 110, improving the cutting effect on the viscous medium deposited or entering between the force-receiving member 130 and the inner wall 113 of the housing 110, and further preventing the viscous medium from caking and blocking between the force-receiving member 130 and the inner wall 113 of the housing 110.

[0097] As Figure 4 shown, in some embodiments, optionally, along the axial direction of the force-receiving member 130, at least one first tooth portion 141 includes an opposite first end 142 and second end 143, and the first end 142 is farther from the pressure detection member 120 than the second end 143; wherein, along the circumferential direction of the force-receiving member 130, the width of the first end 142 is smaller than the width of the second end 143.

[0098] In this embodiment, it is defined that at least one first tooth portion 141 includes a first end 142 and a second end 143, the first end 142 and the second end 143 are opposite along the axial direction of the force-receiving member 130, and the first end 142 is farther from the pressure detection member 120 than the second end 143, that is to say, the first end 142 faces outwards.

[0099] Since the circumferential width of the first end 142 is smaller than the circumferential width of the second end 143, at least one first tooth portion 141 is formed into a structure similar to the plow tip on a farming machine. When the pressure of the medium to be measured acts on the force-receiving member 130 and the force-receiving member 130 drives the toothed structure 140 to move relative to the housing 110, the viscous medium can be effectively plowed open, improving the cutting effect on the viscous medium deposited or entering between the force-receiving member 130 and the inner wall 113 of the housing 110, and further preventing the viscous medium from caking and blocking between the force-receiving member 130 and the inner wall 113 of the housing 110.

[0100] As Figure 4 、 Figure 5 and Figure 6 shown, in some embodiments, optionally, any two adjacent first tooth portions 141 and a part of the outer wall 131 of the force-receiving member 130 form a diversion channel 150, and the diversion channel 150 is communicated with the opening 112; the housing 110 is further provided with an overflow port 114, and the overflow port 114 is communicated with the opening 112.

[0101] In this embodiment, it is defined that the housing 110 is further provided with an overflow port 114. Specifically, the overflow port 114 communicates with the opening 112. It can be understood that the overflow port 114 communicates with the outside, so that the test medium deposited in the gap between the inner wall 113 of the housing 110 and the force-receiving member 130 can be discharged through the overflow port 114, further preventing blockage caused by hardening and deposition, and thus preventing the situation where the movement of the force-receiving member 130 is blocked, and improving the detection accuracy of the pressure transmitter 100.

[0102] Any two adjacent first tooth portions 141 and a part of the outer wall 131 of the force-receiving member 130 enclose a diversion channel 150. The diversion channel 150 communicates with the opening 112. When the force-receiving member 130 contacts the test medium, the test medium can enter the gap between the force-receiving member 130 and the inner wall 113 of the housing 110 through the diversion channel 150 and be discharged through the overflow port 114, that is, the test medium entering from the diversion channel 150 can carry away the test medium deposited between the force-receiving member 130 and the inner wall 113 of the housing 110, further achieving the purpose of preventing blockage.

[0103] Optionally, the number of the overflow ports 114 is multiple. The multiple overflow ports 114 are spaced apart and evenly arranged along the circumferential direction of the force-receiving member 130, and each overflow port 114 communicates with the opening 112.

[0104] In some embodiments, optionally, the outer wall 131 of the force-receiving member 130 is provided with a diversion surface 132. The diversion surface 132 and any two adjacent first tooth portions 141 form a diversion channel 150; wherein, one end of the diversion surface 132 away from the pressure detection member 120 extends obliquely toward the side where the central axis of the force-receiving member 130 is located.

[0105] As Figure 4 shown, in this embodiment, it is defined that the outer wall 131 of the force-receiving member 130 is provided with a diversion surface 132. Specifically, the diversion surface 132 is an inclined surface, which is beneficial to guiding the test medium to the gap between the force-receiving member 130 and the inner wall 113 of the housing 110 through the diversion channel 150, and then the test medium accumulated in the gap between the force-receiving member 130 and the inner wall 113 of the housing 110 can be washed away through the overflow port 114, improving the anti-blocking effect.

[0106] As Figure 2 、 Figure 8 、 Figure 9 and Figure 10 shown, in some embodiments, optionally, the pressure transmitter 100 further includes a blocking portion 160. The blocking portion 160 is disposed on the housing 110 and at least partially located between the overflow port 114 and the force-receiving member 130.

[0107] In this embodiment, it is defined that the pressure transmitter 100 further includes a blocking portion 160. Specifically, the blocking portion 160 is disposed on the housing 110, and at least a part of the blocking portion 160 is located between the overflow port 114 and the force-receiving member 130. Since the overflow port 114 is used to discharge the medium to be measured that enters between the force-receiving member 130 and the inner wall 113 of the housing 110, by providing the blocking portion 160, the medium to be measured at the overflow port 114 can be effectively blocked from entering the gap between the force-receiving member 130 and the wall of the cavity 111, preventing the medium to be measured from being blocked between the force-receiving member 130 and the wall of the cavity 111 and causing the movement of the force-receiving member 130 to be blocked or jammed, and further improving the detection accuracy of the pressure transmitter 100.

[0108] Optionally, a part of the housing 110 protrudes and extends in a direction away from the pressure detection member 120 to form the blocking portion 160.

[0109] Such as Figure 8 、 Figure 9 and Figure 10 shown, in some embodiments, optionally, the blocking portion 160 includes a limiting surface 161 and a check surface 162. Among them, along the axial direction of the force-receiving member 130, the limiting surface 161 can abut against the force-receiving member 130, and the check surface 162 is connected to the side of the limiting surface 161 close to the overflow port 114 and at least partially faces the overflow port 114.

[0110] In this embodiment, it is defined that the blocking portion 160 includes a limiting surface 161 and a check surface 162. Specifically, along the axial direction of the force-receiving member 130, the limiting surface 161 can abut against the force-receiving member 130, thereby limiting the force-receiving member 130 axially and preventing the force-receiving member 130 from moving excessively, which is beneficial to further achieving the accurate measurement of the medium to be measured by the pressure transmitter 100.

[0111] The check surface 162 is located on the side of the limiting surface 161 close to the overflow port 114, and at least a part of the check surface 162 faces the overflow port 114, so that the medium to be measured at the overflow port 114 can be effectively blocked from entering the gap between the force-receiving member 130 and the wall of the cavity 111, preventing the medium to be measured from being blocked between the force-receiving member 130 and the wall of the cavity 111 and causing the movement of the force-receiving member 130 to be blocked or jammed, and further improving the detection accuracy of the pressure transmitter 100.

[0112] In some embodiments, optionally, the end of the check surface 162 away from the limiting surface 161 extends obliquely in a direction away from the central axis of the force-receiving member 130.

[0113] In this embodiment, the anti-backflow surface 162 is defined as an inclined surface, which is beneficial to further prevent the medium to be measured at the overflow port 114 from entering the gap between the force-receiving member 130 and the cavity wall of the cavity 111, and avoid the medium to be measured from being blocked between the force-receiving member 130 and the cavity wall of the cavity 111, resulting in the movement of the force-receiving member 130 being blocked or jammed, and further improving the detection accuracy of the pressure transmitter 100.

[0114] As Figure 8 , Figure 9 and Figure 10 shown, in some embodiments, optionally, the force-receiving member 130 is provided with a mating groove 133, and at least a part of the blocking portion 160 is located in the mating groove 133; wherein, the mating groove 133 is provided with a mating surface 134, and at least a part of the mating surface 134 is in contact with the anti-backflow surface 162.

[0115] In this embodiment, it is defined that the force-receiving member 130 is provided with a mating groove 133. Specifically, at least a part of the blocking portion 160 is located in the mating groove 133, which is beneficial to improving the limiting effect on the axial movement of the force-receiving member 130. At the same time, it is also beneficial to limit the force-receiving member 130 in the radial direction of the force-receiving member 130. When the force-receiving member 130 moves relative to the housing 110, it prevents the force-receiving member 130 from moving offset, which is beneficial to further improving the detection accuracy.

[0116] The mating groove 133 is provided with a mating surface 134, and at least a part of the mating surface 134 is in contact with the anti-backflow surface 162, so as to further prevent the medium to be measured from entering the gap between the force-receiving member 130 and the cavity wall of the cavity 111, and avoid the medium to be measured from being blocked between the force-receiving member 130 and the cavity wall of the cavity 111, resulting in the movement of the force-receiving member 130 being blocked or jammed.

[0117] As Figure 2 , Figure 8 , Figure 9 and Figure 10 shown, in some embodiments, optionally, the pressure transmitter 100 further includes a sealing member 170, and the sealing member 170 is arranged between the cavity wall of the cavity 111 and the force-receiving member 130.

[0118] In this embodiment, it is defined that the pressure transmitter 100 further includes a sealing member 170. Specifically, the sealing member 170 is arranged between the cavity wall of the cavity 111 and the force-receiving member 130, so as to seal the gap between the force-receiving member 130 and the cavity wall of the cavity 111.

[0119] It can be understood that the force-receiving member 130 and the housing 110 itself have manufacturing and processing tolerances. When in use after assembly, when there is an instantaneous overload impact, silicone oil leakage is likely to occur.

[0120] By providing a seal 170 between the force-bearing member 130 and the wall of the cavity 111, effective sealing of the cavity 111 can be achieved, preventing silicone oil leakage that could cause oil pressure fluctuations. Furthermore, it can ensure that the force-bearing member 130 does not shift when moving relative to the housing 110, improving the detection accuracy of the pressure transmitter 100.

[0121] In addition, providing the seal 170 can also provide good support for the force-bearing member 130, making the central axis of the force-bearing member 130 parallel or coincident with the central axis of the housing 110. This is beneficial for ensuring that the force-bearing member 130 does not shift when moving axially relative to the housing 110, avoiding structural jamming forces, preventing the movement of the force-bearing member 130 from being blocked, and further improving the detection accuracy of the pressure transmitter 100.

[0122] Optionally, the seal 170 includes an O-ring.

[0123] As Figure 2 shown, in some embodiments, optionally, the number of seals 170 is at least two, and the at least two seals 170 are arranged axially along the force-bearing member 130.

[0124] In this embodiment, it is specified that the number of seals 170 is at least two. Specifically, the at least two seals 170 are arranged axially along the force-bearing member 130, which is beneficial for further sealing the gap between the force-bearing member 130 and the wall of the cavity 111 and further preventing silicone oil leakage.

[0125] At the same time, it can further improve the support effect on the force-bearing member 130, making the central axis of the force-bearing member 130 as parallel or coincident as possible with the central axis of the housing 110. This is beneficial for ensuring that the force-bearing member 130 does not shift when moving axially relative to the housing 110, avoiding structural jamming forces, preventing the movement of the force-bearing member 130 from being blocked, and further improving the detection accuracy of the pressure transmitter 100.

[0126] As Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10 shown, in some embodiments, optionally, the toothed structure 140 further includes a plurality of second teeth 144. Axially along the force-bearing member 130, the plurality of second teeth 144 are located on the side of the plurality of first teeth 141 closer to the pressure detection member 120, and the plurality of second teeth 144 are arranged at intervals circumferentially along the force-bearing member 130.

[0127] In this embodiment, it is defined that the tooth-shaped structure 140 also includes a plurality of second tooth portions 144. Specifically, along the axial direction of the force-bearing member 130, the plurality of second tooth portions 144 are located on the side of the plurality of first tooth portions 141 close to the pressure detecting member 120. That is, the plurality of second tooth portions 144 and the plurality of first tooth portions 141 are distributed along the axial direction of the force-bearing member 130.

[0128] Specifically, when the force-bearing member 130 moves relative to the shell 110 toward the side away from the pressure detecting member 120, the plurality of first teeth 141 can be used to cut the viscous mud (the medium to be measured) to prevent the mud from being blocked in the gap between the inner wall 113 of the shell 110 and the force-bearing member 130, thereby ensuring that when the medium to be measured acts on the force-bearing member 130, the force-bearing member 130 can be effectively displaced relative to the shell 110 to achieve pressure transmission.

[0129] When the force-bearing member 130 moves relative to the shell 110 toward the side close to the pressure detecting member 120, the plurality of second teeth 144 can be used to cut the viscous mud, further avoiding the situation where the movement of the force-bearing member 130 is obstructed or even stuck due to the compaction and blockage of the mud, thereby improving the detection accuracy of the pressure transmitter 100.

[0130] like Figure 1 and Figure 2 As shown, in some embodiments, optionally, the force-bearing member 130 faces one end of the pressure detecting member 120, part of the cavity wall of the shell 110 and the pressure detecting member 120 to enclose a detection cavity 180, and the shell 110 is also provided with an injection channel 115, which is connected to the detection cavity 180; the pressure transmitter 100 also includes a switch valve 190, which is provided at one end of the injection channel 115 away from the detection cavity 180, and is used to open or close the injection channel 115.

[0131] In this embodiment, it is defined that the pressure transmitter 100 further includes a switch valve 190. Specifically, the injection channel 115 is communicated with the detection chamber 180, and is used to inject a force transmission medium into the detection chamber 180. The force transmission medium includes silicone oil.

[0132] It is understandable that the manufacturing process of the silicone oil system is generally as follows: the product is placed in a vacuum chamber and the entire chamber is evacuated, and the air in the silicone oil cavity 111 (detection cavity 180) inside the product is also evacuated to reach a vacuum state; then, the product is immersed in a silicone oil pool in the vacuum chamber, and the silicone oil fills the cavity 111 inside the product from the oil filling hole; then, a steel ball is placed in the oil filling hole, and the steel ball is welded to the oil filling hole by resistance welding to seal the silicone oil cavity 111.

[0133] However, there is silicone oil on the surface of the oil injection hole and the steel ball fitting line. During resistance welding, high temperature will cause the silicone oil to generate gas, making the detection cavity 180 not entirely filled with silicone oil. Due to the huge difference in the compression ratios of liquid silicone oil and gas, even a small amount of gas will affect the linear accuracy of the pressure transmitter 100.

[0134] Moreover, the steel ball is welded to the cylinder body. Once a problem with oil injection is found and the steel ball needs to be removed for re - oiling and re - welding, cutting is required, which is difficult and usually irreparable, increasing the maintenance difficulty and cost.

[0135] Specifically, after the oil injection is completed, the injection channel 115 is closed by the switching valve 190 to prevent silicone oil leakage, which helps to avoid the offset of the force - receiving member 130 during the axial movement relative to the housing 110. At the same time, it avoids the generation of gas in the detection cavity 180 caused by resistance welding, improving the detection accuracy of the pressure transmitter 100.

[0136] In addition, when the switching valve 190 is opened, re - oiling can be achieved, which helps to reduce the maintenance difficulty and cost.

[0137] Optionally, the switching valve 190 includes a ball valve.

[0138] Optionally, the pressure transmitter 100 further includes a plurality of fixing screws for fixing the switching valve 190.

[0139] As Figure 2 and Figure 3 shown, in some embodiments, optionally, the pressure detection member 120 includes a pressure core 121 and a circuit board 122. Among them, the circuit board 122 is disposed on the side of the pressure core 121 facing away from the force - receiving member 130 and is electrically connected to the pressure core 121; the pressure transmitter 100 further includes a connector 210, and the connector 210 is disposed on the housing 110 and is electrically connected to the circuit board 122 for connecting to a host computer.

[0140] In this embodiment, it is defined that the pressure detection member 120 includes a pressure core 121 and a circuit board 122. Specifically, the circuit board 122 is disposed on the side of the pressure core 121 facing away from the force - receiving member 130, and the circuit board 122 is electrically connected to the pressure core 121, and the connector 210 is electrically connected to the circuit board 122.

[0141] Specifically, when the pressure transmitter 100 is installed on the customer's device, the pressure of the medium to be measured acts on the force-receiving member 130. The force-receiving member 130 undergoes a small displacement, squeezing the silicone oil in the detection cavity 180. The silicone oil transmits the pressure to the surface of the pressure core 121. After the pressure core 121 collects and preliminarily processes the pressure signal, it is sent to the circuit board 122. The circuit board 122 converts these signals into the formats required by the customer (analog signals: current, voltage; digital signals: various signal formats such as CAN (Controller Area Network)), and transmits them to the host computer of the client through the connector 210.

[0142] Optionally, the connector 210 includes a connector body and a cable. The connector body is arranged 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. Among them, the connector 210 is a waterproof connector 210. For example, it is an aviation connector 210.

[0143] Optionally, the pressure detection member 120 further includes a pressing member. The pressing member is connected to the inner wall of the cavity 111 and abuts against the pressure core 121 to fix the pressure core 121. The circuit board 122 is fixedly installed on the pressing member.

[0144] Optionally, the housing 110 is further provided with a protective cover, and the protective cover covers the outside of the connector 210.

[0145] Optionally, the housing 110 includes a housing body and a flange. The flange and the force-receiving member 130 are respectively arranged at both ends of the housing body in the axial direction. A sealing ring is arranged at the connection between the housing body and the flange to seal the cavity 111. The connector 210 and the protective cover are arranged on the flange.

[0146] Optionally, the pressure transmitter 100 further includes a waterproof breathable valve and a breather tube.

[0147] Such as Figure 2 and Figure 11As shown, optionally, the pressure transmitter 100 further includes a guide member 220. The guide member 220 is disposed within the cavity 111, and the guide member 220 is provided with a guide channel 221. At least a portion of the force-receiving member 130 is located within the guide channel 221 and is capable of moving within the guide channel 221. That is to say, when the pressure of the medium to be measured acts on the force-receiving member 130, at least a portion of the force-receiving member 130 moves within the guide channel 221, that is, the force-receiving member 130 is supported within the cavity 111. When the force-receiving member 130 moves relative to the housing 110, the central axis of the force-receiving member 130 is parallel to or coincides with the central axis of the housing 110, effectively avoiding the problem that the force-receiving member 130 is offset when moving relative to the housing 110, and then resulting in contact friction between the force-receiving member 130 and the cavity wall of the cavity 111, causing the movement of the force-receiving member 130 to be blocked, and effectively improving the accuracy of the output data of the pressure transmitter 100. At the same time, it is also beneficial to reduce the wear of the force-receiving member 130 and the housing 110 and extend the service life of the pressure transmitter 100.

[0148] Optionally, the guide channel 221 includes a channel wall, and the surface roughness of the channel wall is less than a set value. That is to say, the channel wall is a smooth wall surface, so that while the guide member 220 supports the force-receiving member 130 and avoids the offset of the movement of the force-receiving member 130, the friction between the force-receiving member 130 and the guide member 220 is effectively reduced, and further the wear of the force-receiving member 130 and the guide member 220 caused by friction is reduced, ensuring that the force-receiving member 130 is not blocked when moving axially relative to the housing 110, and improving the output accuracy of the pressure transmitter 100.

[0149] Optionally, the guide member 220 is made of copper. It can be understood that the copper material has a self-lubricating effect, so that while supporting the force-receiving member 130 and avoiding the offset of the movement of the force-receiving member 130, the friction between the force-receiving member 130 and the guide member 220 is effectively reduced, and further the wear of the force-receiving member 130 and the guide member 220 caused by friction is reduced, ensuring that the force-receiving member 130 is not blocked when moving axially relative to the housing 110, and improving the output accuracy of the pressure transmitter 100. In addition, the copper material also has good wear resistance, which is beneficial to extending the service life of the guide member 220.

[0150] Optionally, the pressure transmitter 100 further includes a first oil groove 230. The first oil groove 230 is disposed on a side of the force-bearing member 130 away from the opening 112 and is located between the force-bearing member 130 and the cavity wall of the cavity 111. The first oil groove 230 communicates with the detection cavity 180 and extends at least partially in the radial direction of the force-bearing member 130. That is to say, the first oil groove 230 is provided at the gap between the cavity wall of the cavity 111 and the force-bearing member 130, and the first oil groove 230 communicates with the detection cavity 180. That is, the silicone oil in the detection cavity 180 can partially flow into the first oil groove 230 to fill the gap between the force-bearing member 130 and the cavity wall of the cavity 111, and discharge the air at the gap between the force-bearing member 130 and the cavity wall of the cavity 111, further ensuring that the force-bearing member 130 is not blocked when moving relative to the housing 110, which is beneficial to further improving the output accuracy of the pressure transmitter 100. At least a part of the first oil groove 230 extends in the radial direction of the force-bearing member 130, that is, the force-bearing member 130 uses the surface perpendicular to the central axis direction of the force-bearing member 130 to bear the oil pressure, which is beneficial to ensuring that the force-bearing member 130 moves more smoothly in the axial direction and further improving the detection accuracy of the pressure transmitter 100.

[0151] As Figure 11 shown, optionally, the pressure transmitter 100 further includes a second oil groove 240. The second oil groove 240 is disposed on a side of the guiding member 220 facing the force-bearing member 130 and extends at least partially in the axial direction of the force-bearing member 130. The second oil groove 240 communicates with the guiding channel 221. One end of the second oil groove 240 communicates with the detection cavity 180, and the other end of the second oil groove 240 communicates with the first oil groove 230. On the one hand, by providing the second oil groove 240, it is ensured that the silicone oil in the detection cavity 180 can flow into the first oil groove 230 through the second oil groove 240 to fill the gap between the force-bearing member 130 and the cavity wall of the cavity 111. On the other hand, by providing the second oil groove 240, the gap between the guiding member 220 and the force-bearing member 130 can also be filled, further discharging the air in the cavity 111, preventing the force-bearing member 130 from being blocked during movement, and improving the detection accuracy of the pressure transmitter 100.

[0152] In the description of this specification, terms such as "connection", "installation", and "fixation" should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0153] In the description of this specification, the descriptions of the terms "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0154] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pressure transmitter, characterized in that, Comprising: A housing, the housing being provided with a cavity and an opening that communicate with each other; A pressure detection member, disposed within the cavity, for detecting the pressure of a medium to be measured; A force-receiving member, disposed within the cavity and capable of moving relative to the housing along the axial direction of the force-receiving member, one end of the force-receiving member facing away from the pressure detection member being located at the opening, for contacting the medium to be measured and capable of transmitting the pressure of the medium to be measured to the pressure detection member; A toothed structure, disposed at one end of the force-receiving member facing away from the pressure detection member and at least partially disposed between the inner wall of the housing at the opening and the outer wall of the force-receiving member.

2. The pressure transmitter according to claim 1, characterized in that, The toothed structure includes a plurality of first tooth portions, and the plurality of first tooth portions are spaced along the circumferential direction of the force-receiving member on the outer peripheral side of the force-receiving member; Wherein, at least one of the first tooth portions can contact the inner wall of the housing at the opening.

3. The pressure transmitter according to claim 2, characterized in that, Along the axial direction of the force-receiving member, at least one of the first tooth portions includes a first end and a second end that face away from each other, and the first end is farther from the pressure detection member than the second end; Wherein, along the circumferential direction of the force-receiving member, the width of the first end is smaller than the width of the second end.

4. The pressure transmitter according to claim 2, characterized in that, Any two adjacent first tooth portions and a part of the outer wall of the force-receiving member form a diversion channel, and the diversion channel communicates with the opening; The housing is further provided with an overflow port, and the overflow port communicates with the opening.

5. The pressure transmitter according to claim 4, wherein Further comprising: A blocking portion, disposed on the housing and at least partially located between the overflow port and the force-receiving member.

6. The pressure transmitter according to claim 5, characterized in that, The blocking portion includes: A limiting surface, along the axial direction of the force-receiving member, the limiting surface can abut against the force-receiving member; A check valve surface, connected to the side of the limiting surface close to the overflow port and at least partially opposite to the overflow port; Wherein, one end of the check valve surface away from the limiting surface extends obliquely in a direction away from the central axis of the force-receiving member.

7. The pressure transmitter according to claim 6, characterized in that, The force-receiving member is provided with a mating groove, and at least a part of the blocking portion is located within the mating groove; Wherein, the mating groove is provided with a mating surface, and at least a part of the mating surface contacts the check valve surface.

8. The pressure transmitter according to any one of claims 1 to 7, characterized in that, Further comprising: A sealing member, disposed between the cavity wall of the cavity and the force-receiving member; Wherein, 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 force-receiving member.

9. The pressure transmitter according to any one of claims 2 to 7, characterized in that, The toothed structure further includes a plurality of second tooth portions, along the axial direction of the force-receiving member, the plurality of second tooth portions are located on the side of the plurality of first tooth portions close to the pressure detection member, and the plurality of second tooth portions are spaced along the circumferential direction of the force-receiving member.

10. The pressure transmitter according to any one of claims 1 to 7, characterized in that, One end of the force-receiving member facing the pressure detection member, a part of the cavity wall of the housing and the pressure detection member enclose a detection cavity, and the housing is further provided with an injection channel, and the injection channel communicates with the detection cavity; The pressure transmitter further includes: A switching valve, disposed at one end of the injection channel facing away from the detection cavity, for opening or closing the injection channel.

11. The pressure transmitter according to any one of claims 1 to 7, characterized in that, The pressure detection member includes: A pressure core body; A circuit board, disposed on the side of the pressure core body facing away from the force-receiving member and electrically connected to the pressure core body; The pressure transmitter further includes: A connector, which is provided on the housing and electrically connected to the circuit board, is used to connect to a host computer.

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