A pressure-bearing miniature coaxial capacitive level gauge suitable for small mobile platforms

Abstract

This utility model belongs to the technical field of capacitive level gauges, and particularly relates to a pressure-bearing small coaxial capacitive level gauge suitable for small mobile platforms. It includes a plug body, and further includes: a plug threaded ring surrounding the plug body, an outer tube installed on the external thread of the plug threaded ring, a liquid inlet hole pre-reserved at the connection between the outer tube and the plug body, a cut surface on the outside of the plug body allowing liquid to enter from the bottom of the outer tube, and vent holes at both ends of the outer tube. This utility model utilizes the mounting housing to primarily bear pressure. Applying threadlocker or wrapping Teflon tape on the mounting threads can enhance pressure resistance. Additionally, there is a cavity between the mounting housing and the pressure-bearing nut, and a washer placed inside the cavity, positioned above the rubber ring, ensures that the rubber ring can expand laterally when the pressure-bearing nut is pressed downwards, thus tightly locking the quartz tube and providing pressure resistance.

Description

Technical Field

[0001] This utility model belongs to the technical field of capacitive level gauges, and in particular relates to a pressure-bearing small coaxial capacitive level gauge suitable for use on small mobile platforms. Background Technology

[0002] Existing capacitive level gauges use fluoroplastics as the wetted material. Fluoroplastics are prone to deformation and have low straightness and accuracy, which affects the measurement accuracy of capacitive level gauges. Fluoroplastics soften or even melt when the temperature rises to about 200 degrees Celsius. Therefore, a pressure-bearing small coaxial capacitive level gauge suitable for small mobile platforms is proposed.

[0003] For example, Chinese patent CN209727213U discloses a capacitive liquid level gauge connection mechanism, including a liquid level gauge body. The liquid level gauge body is equipped with a heat sink, a connector, and a probe in sequence from top to bottom. The feature is that a level is installed on the upper surface of the liquid level gauge body, an installation ring is installed on the outer side wall of the connector, and multiple hollow support rods are installed on the installation ring.

[0004] This patent has the following problems:

[0005] Existing capacitive level gauges use fluoroplastics as their wetted material. Fluoroplastics are prone to deformation and have low straightness and accuracy, which affects the measurement accuracy of capacitive level gauges. Fluoroplastics will soften or even melt when the temperature rises to around 200 degrees Celsius.

[0006] In addition, the existing capacitive level gauges have a single electrode structure. When switching between different media, the single electrode needs to be recalibrated, which is inconvenient.

[0007] Existing capacitive level gauges are large and heavy, making them unsuitable for small mobile platforms.

[0008] Existing technologies make it inconvenient to use small capacitive level gauges under pressure. When the pressure nut is pressed downwards, the protective tube of the probe is damaged, leading to damage to the level gauge. This indicates poor pressure resistance. Furthermore, existing capacitive level gauges use fluoroplastics as the wetted material, which is prone to deformation and has low accuracy, affecting the measurement accuracy. Fluoroplastics soften or even melt at around 200 degrees Celsius. Additionally, the existing technology has an opening on the side of the outer tube for liquid inlet, which is prone to blockage and affects the normal operation of the level gauge. Therefore, we propose a pressure-bearing small coaxial capacitive level gauge suitable for small mobile platforms. Utility Model Content

[0009] The purpose of this invention is to address the aforementioned technical problems by providing a pressure-bearing miniature coaxial capacitive level gauge suitable for use on small mobile platforms, thereby improving the accuracy and pressure resistance of the miniature capacitive level gauge and enhancing its portability.

[0010] In view of this, the present invention provides a pressure-bearing small coaxial capacitive level gauge suitable for small mobile platforms, including a plug body, and further comprising: a plug threaded ring surrounding the plug body, an outer tube installed on the external thread of the plug threaded ring, a liquid inlet hole reserved at the connection between the outer tube and the plug body, a cut surface on the outside of the plug body allowing liquid to enter from the bottom of the outer tube, vent holes at both ends of the outer tube for venting gas from the outer tube, a quartz tube fixedly fitted inside the outer tube, a probe fixedly installed inside the quartz tube, a mounting housing connected to one side of the outer tube, a pressure-bearing nut connected to one side of the mounting housing, an annular groove on the other side of the pressure-bearing nut for installing a rubber ring, a cavity penetrating inside the pressure-bearing nut, an internal thread on one side of the cavity for sealing with a hexagonal nut, and a washer inside the cavity.

[0011] Based on the above structure, the mounting housing primarily serves the crucial role of bearing pressure. The pressure-bearing nut is designed with a hexagonal shape, allowing for direct tightening with a wrench into the mounting position. Applying threadlocker or wrapping Teflon tape to the mounting threads further enhances pressure resistance. Additionally, there is a cavity between the mounting housing and the pressure-bearing nut. A washer positioned inside this cavity, above a rubber ring, ensures that the rubber ring expands laterally when the pressure-bearing nut compresses downwards, tightly locking the quartz tube and providing pressure resistance. The pressure-bearing nut primarily functions to compress the rubber ring, ensuring it tightly locks the quartz tube and thus providing pressure resistance. The design of the pressure-bearing nut takes into account the inconvenience of tightening it; therefore, a hexagonal shape is added at the top to ensure pressure resistance. The pressure nut and the mounting housing can be tightened very securely, while applying a large force to the rubber ring, improving the pressure resistance of the small coaxial capacitive level gauge. A vent hole is installed inside the outer tube, allowing gas to escape as liquid enters. The quartz tube, made of quartz, works in conjunction with the internally fixed probe, preventing deformation and ensuring a long service life, thus improving the measurement accuracy of the capacitive level gauge. A threaded ring surrounds the plug body, allowing it to be threaded inside the outer tube. The plug body then secures the bottom of the probe. The external cut surface of the plug body allows direct communication between the outside and the inside of the outer tube for internal and external pressure stabilization. Liquid flows into the outer tube and electrode from this connection.

[0012] Preferably, the outer periphery of the mounting housing is provided with mounting threads, and threadlocker is applied to the mounting threads during use.

[0013] Preferably, an external threaded expansion cylinder is fixedly installed on one side of the pressure-bearing nut, and a copper stud mounting hole is provided through the interior of the external threaded expansion cylinder, and a circuit board compartment is connected to the exterior of the external threaded expansion cylinder.

[0014] Preferably, an external threaded sleeve is fixedly installed on one side of the circuit board compartment, and an internal thread is provided on the other side of the circuit board compartment.

[0015] Preferably, a cable outlet cover is threaded onto one side of the external threaded sleeve, and the cable outlet cover has an internal thread for connecting the external threaded sleeve.

[0016] Preferably, a threading tube is provided through one side of the cable outlet cover, and a threading hole is provided through the inside of the threading tube.

[0017] The beneficial effects of this utility model are:

[0018] 1. This pressure-bearing miniature coaxial capacitive level gauge, suitable for small mobile platforms, primarily relies on its mounting housing for pressure resistance. Firstly, the threaded fasteners, the mechanical components required during installation, utilize a hexagonal pressure-bearing nut that can be directly tightened into place with a wrench. Applying threadlocker or wrapping Teflon tape to the threads further enhances pressure resistance. A cavity exists between the mounting housing and the pressure-bearing nut, housing a washer positioned above a rubber ring. This ensures that the rubber ring expands laterally when the pressure-bearing nut is pressed downwards, tightly locking the quartz tube and providing pressure resistance. The pressure-bearing nut primarily compresses the rubber ring, ensuring it tightly locks the quartz tube, thus providing pressure resistance. The design incorporates a hexagonal shape to prevent inconvenience in tightening, ensuring a secure connection between the nut and the mounting housing while applying significant force to the rubber ring, thereby improving the pressure resistance of the miniature coaxial capacitive level gauge.

[0019] 2. This pressure-bearing miniature coaxial capacitive level gauge, suitable for small mobile platforms, allows gas to escape when liquid enters through a vent hole inside the outer tube. The quartz tube, made of quartz material, works in conjunction with an internally fixed probe, preventing deformation and ensuring a long service life, thus improving the measurement accuracy of the capacitive level gauge. The quartz tube's excellent corrosion resistance and the probe's stable chemical properties make it suitable for various media. This design facilitates easy installation and use of the miniature capacitive level gauge on small platforms, enhancing its portability.

[0020] 3. This pressure-bearing miniature coaxial capacitive level gauge, suitable for small mobile platforms, uses a plug body with a threaded ring surrounding the outside to install the plug body inside the outer tube. The plug body then fixes the bottom of the probe. The plug body has a cut surface on its outside, allowing direct communication between the outside and the inside of the outer tube for internal and external pressure stabilization. Liquid flows into the outer tube and electrode from this connection. Compared to existing technologies with side openings in the outer tube, this design reduces the risk of blockage, ensuring the normal operation of the level gauge. Attached Figure Description

[0021] Figure 1 This is a perspective view of the entire utility model;

[0022] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 3 This is a partial perspective view of the plug body in this utility model;

[0024] Figure 4 This is a partial structural diagram of the external threaded expansion cylinder in this utility model;

[0025] Figure 5 This is a partial structural diagram of the cable outlet cover in this utility model.

[0026] The markings in the diagram are as follows:

[0027] 1. Plug body; 101. Plug threaded ring; 2. Outer tube; 201. Vent hole; 202. Quartz tube; 203. Probe; 3. Mounting housing; 301. Mounting thread; 4. Pressure nut; 401. Cavity; 5. Circuit board compartment; 501. External threaded sleeve; 6. Cable outlet cover; 7. Cable guide tube; 701. Cable guide hole; 8. External threaded expansion tube; 801. Copper stud mounting hole. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] This application discloses a pressure-bearing miniature coaxial capacitive level gauge suitable for use in small mobile platforms. Please refer to [link to relevant documentation]. Figures 1-5The device includes a plug body 1, and further includes: a plug threaded ring 101 surrounding the plug body 1, an outer tube 2 installed on the external thread of the plug threaded ring 101, a liquid inlet hole reserved at the connection between the outer tube 2 and the plug body 1, a cut surface on the outside of the plug body 1, allowing liquid to enter from the bottom of the outer tube 2, vent holes 201 at both ends of the outer tube 2 for venting gas from the outer tube 2, a quartz tube 202 fixedly sleeved inside the outer tube 2, a probe 203 fixedly installed inside the quartz tube 202, a mounting housing 3 connected to one side of the outer tube 2, a pressure nut 4 connected to one side of the mounting housing 3, an annular groove on the other side of the pressure nut 4 for installing a rubber ring, a cavity 401 penetrating inside the pressure nut 4, an internal thread on one side of the cavity 401 for sealing with a hexagonal nut, and a gasket inside the cavity 401.

[0030] Based on the above structure, the mounting housing 3 plays a crucial role in bearing pressure. Firstly, the fastener 301, a mechanical component required during installation, is used. Since the pressure-bearing nut 4 is hexagonal, it can be directly tightened in place with a wrench. Applying threadlocker or wrapping Teflon tape to the mounting thread 301 further enhances pressure resistance. Additionally, there is a cavity 401 between the mounting housing 3 and the pressure-bearing nut 4. A washer inside this cavity, positioned above the rubber ring, ensures that the rubber ring expands laterally when the pressure-bearing nut 4 is pressed downwards, tightly locking the quartz tube 202 and providing pressure resistance. The pressure-bearing nut 4 primarily compresses the rubber ring, ensuring it tightly locks the quartz tube 202, thus providing pressure resistance. The design of the pressure-bearing nut 4 takes into account the difficulty of tightening, hence the hexagonal shape at the top. This ensures a secure connection between the pressure-bearing nut 4 and the mounting housing 3, while simultaneously applying significant force to the rubber ring, improving the pressure resistance of the small coaxial capacitive leveling device. The pressure resistance of the gauge is improved; when liquid enters through the vent hole 201 inside the outer tube 2, gas can be discharged from the vent hole 201. Then, the quartz tube 202, made of quartz, is used in conjunction with the probe 203, which is fixedly installed inside. It will not deform, has a long service life, and improves the measurement accuracy of the capacitive level gauge. The quartz tube 202 has good corrosion resistance, and the chemical properties of the probe 203 are very stable and can be used for various media. It can be conveniently installed and used on small platforms, thereby improving the portability of the small capacitive level gauge. The plug body 1 is threaded inside the outer tube 2 by the plug thread ring 101 surrounding the outside of the plug body 1. Then, the bottom of the probe 203 is fixed by the plug body 1. The plug body 1 has a cut surface on the outside, which allows the outside to communicate directly with the inside of the outer tube 2 for internal and external pressure stabilization. The liquid will flow into the outer tube 2 and the electrode from the connection point. Compared with the existing technology with the outer tube 2 having a side opening, it is not easy to be blocked, ensuring the normal operation of the level gauge.

[0031] In one embodiment, the outer periphery of the mounting housing 3 is provided with mounting threads 301, which are applied with thread-locking adhesive during use.

[0032] Specifically, the mounting thread 301 is used to connect the mechanical parts that are needed.

[0033] In this embodiment, the mounting housing 3 plays a crucial role in bearing pressure.

[0034] In one embodiment, an external threaded expansion cylinder 8 is fixedly installed on one side of the pressure-bearing nut 4. A copper stud mounting hole 801 is provided through the interior of the external threaded expansion cylinder 8, and a circuit board compartment 5 is connected to the exterior of the external threaded expansion cylinder 8.

[0035] Specifically, the external threaded expansion cylinder 8 is used in conjunction with the internal thread of the connecting circuit board compartment 5 to connect the circuit board compartment 5.

[0036] In this embodiment, the copper stud body can be installed using the copper stud mounting hole 801, thereby mounting the circuit board on the copper stud body.

[0037] In one embodiment, an external threaded sleeve 501 is fixedly installed on one side of the circuit board compartment 5, and an internal thread is provided on the other side of the circuit board compartment 5.

[0038] Specifically, the threaded structure of the circuit board compartment 5 facilitates its disassembly and assembly, making maintenance convenient.

[0039] In this embodiment, the circuit board compartment 5 can be used to protect the circuit board, thereby improving the safety of circuit board installation. Since the circuit board of the capacitive level gauge is difficult to install, a detachable circuit board compartment 5 is designed. If the circuit board compartment 5 is directly installed on the mounting housing 3, the electrodes will have wires that need to be connected to the circuit board on the outside and then pushed back in. Moreover, the longer the wire, the greater the impact on accuracy, which is not conducive to capacitance measurement. The detachable circuit board compartment 5 can reduce the length of the cable and can add a quick-connect circuit board at the bottom, so that the wires can be directly soldered to the circuit board. Subsequent assembly only requires inserting the core board into the quick-connect circuit board.

[0040] In one embodiment, a cable outlet cover 6 is threaded onto one side of the external threaded sleeve 501. The cable outlet cover 6 has an internal thread for connecting the external threaded sleeve 501.

[0041] Specifically, the internal thread of the cable outlet cover 6 is used in conjunction with the external thread sleeve 501 to enable the cable outlet cover 6 to be disassembled and assembled.

[0042] In this embodiment, the cable connected to the sensor can be led out from above using the cable outlet cover 6, which facilitates external wiring.

[0043] In one embodiment, a wire guide tube 7 is provided through one side of the wire outlet cover 6, and a wire guide hole 701 is provided through the inside of the wire guide tube 7.

[0044] Specifically, the wire through hole 701 allows the wire to pass through, and the wire through hole 701 can be potted to prevent dust from entering the circuit board compartment 5.

[0045] In this embodiment, the wire harness can be passed through the wire hole 701, thereby improving the stability of the circuit board wiring. Its function is to lead out the cable connected to the sensor from the top, which facilitates external wiring.

[0046] In this embodiment, a pressure-bearing miniature coaxial capacitive level gauge suitable for small mobile platforms is used. The circuit board is protected by the circuit board compartment 5. The removable circuit board compartment 5 reduces cable length, and a quick-connect circuit board can be added at the bottom, allowing direct soldering of the wires. Subsequent assembly simply involves inserting the core board into the quick-connect circuit board. The wire harness is then passed through the through hole 701, which leads the cable connected to the sensor from above. The mounting thread 301, a mechanical component required during installation, is used. Because the pressure-bearing nut 4 is hexagonal, it can be tightened directly in the installation position with a wrench. Applying threadlocker or wrapping Teflon tape to the mounting thread 301 provides pressure resistance. A cavity 401 exists between the mounting housing 3 and the pressure-bearing nut 4. A washer inside the cavity 401, positioned above a rubber ring, ensures that the rubber ring expands laterally when the pressure-bearing nut 4 is pressed downwards, allowing the quartz crystal to... The tube 202 is tightly locked, and the pressure nut 4 mainly functions to press the rubber ring, making the rubber ring tightly lock the quartz tube 202, thus providing pressure resistance. The pressure nut 4 was designed with the inconvenience of tightening in mind, so a hexagonal part was added at the top to ensure a secure tightening between the pressure nut 4 and the mounting housing 3. Then, through the vent hole 201 inside the outer tube 2, when liquid enters, gas can be discharged from the vent hole 201. Finally, the quartz tube 202, made of quartz, works in conjunction with the internally fixed probe 2. 03. It will not deform. Then, the plug body 1 is installed in the inner thread of the outer tube 2 by the plug thread ring 101 surrounding the plug body 1. Then, the plug body 1 fixes the bottom of the probe 203. The plug body 1 has a cut surface on the outside, so that the outside can be directly connected to the inside of the outer tube 2 for internal and external pressure stabilization. The liquid will flow into the outer tube 2 and the electrode from the connection. Compared with the existing technology with the side opening of the outer tube 2, it is not easy to be blocked, ensuring the normal operation of the level gauge.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A pressure-bearing miniature coaxial capacitive level gauge suitable for use on small mobile platforms, comprising a plug body (1), characterized in that, Also includes: The plug body (1) is surrounded by a plug thread ring (101), and an outer tube (2) is installed on the external thread of the plug thread ring (101). A liquid inlet hole is provided at the connection between the outer tube (2) and the plug body (1). The plug body (1) has a cut surface on its exterior, allowing liquid to enter from the bottom of the outer tube (2). Vent holes (201) are provided at both ends of the outer tube (2) for venting gas from inside the outer tube (2). A quartz tube (202) is fixedly fitted inside the outer tube (2). A probe (203) is fixedly installed inside the quartz tube (202). A mounting housing (3) is connected to one side of the outer tube (2). A pressure-bearing nut (4) is connected to one side of the mounting housing (3). An annular groove is provided on the other side of the pressure-bearing nut (4) for installing a rubber ring. A cavity (401) is provided inside the pressure-bearing nut (4). An internal thread is provided on one side of the cavity (401) to cooperate with a hexagonal nut for sealing. A washer is provided inside the cavity (401).

2. The pressure-bearing miniature coaxial capacitive level gauge suitable for small mobile platforms according to claim 1, characterized in that: The mounting housing (3) is surrounded by mounting threads (301), and thread-locking adhesive is applied to the mounting threads (301) during use.

3. A pressure-bearing miniature coaxial capacitive level gauge suitable for use on a small mobile platform according to claim 1, characterized in that: An external threaded expansion cylinder (8) is fixedly installed on one side of the pressure-bearing nut (4). A copper stud mounting hole (801) is provided through the interior of the external threaded expansion cylinder (8). A circuit board compartment (5) is connected to the outside of the external threaded expansion cylinder (8).

4. A pressure-bearing miniature coaxial capacitive level gauge suitable for use on a small mobile platform according to claim 3, characterized in that: An external threaded sleeve (501) is fixedly installed on one side of the circuit board compartment (5), and an internal thread is provided on the other side of the circuit board compartment (5).

5. A pressure-bearing miniature coaxial capacitive level gauge suitable for use on a small mobile platform according to claim 4, characterized in that: The external threaded sleeve (501) has a wire outlet cover (6) threaded on one side. The wire outlet cover (6) has an internal thread for connecting the external threaded sleeve (501).

6. A pressure-bearing miniature coaxial capacitive level gauge suitable for use on a small mobile platform according to claim 5, characterized in that: A wire guide tube (7) is provided through one side of the wire outlet cover (6), and a wire guide hole (701) is provided through the inside of the wire guide tube (7).

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