A protection device for pressure transmitters

Abstract

A protection device for pressure transmitters, belonging to the field of pressure transmitter technology, addresses the problem that pressure sensors are prone to high-temperature anomalies and excessive overall temperature rise after prolonged use. The constant conductivity between the pressure sensor and the measured medium can easily lead to component aging, seal failure, and measurement malfunction, and in severe cases, damage to the pressure sensor. The invention includes a transmitter body with a pressure sensor fixedly installed inside. This invention uses a push plate, a pusher component, and a threaded ring to convert the displacement of the shape memory alloy due to heat deformation into a stable linear thrust. When the pressure sensor experiences an abnormal high-temperature condition, it can quickly drive the sealing component to rotate and close precisely, promptly cutting off the flow channel of the pressure medium inside the transmitter. This prevents the measured medium from continuously contacting, impacting, and corroding the pressure sensor under high-temperature conditions, effectively reducing the risk of pressure sensor damage under high-temperature conditions and achieving instantaneous emergency protection against faults.

Description

Technical Field

[0001] This invention relates to the field of pressure transmitter technology, specifically a protection device for pressure transmitters. Background Technology

[0002] Pressure transmitters are core measurement and control devices in industrial production, chemical processes, energy transmission, and fluid monitoring. They are mainly used to acquire pressure parameters of fluid media inside pipelines and tanks in real time. Relying on built-in pressure sensors, they complete the sensing, conversion, and transmission of pressure signals to ensure stable monitoring and safe management of production conditions. Among them, the pressure sensor, as the core precision detection element of the pressure transmitter, is in a state of continuous power supply and uninterrupted operation, and needs to be in constant contact with the measured fluid medium to achieve continuous measurement.

[0003] Current protection devices for pressure transmitters use pressure sensors that are directly connected to the pressure channel. The sensing end of the pressure sensor is in constant contact with the measured medium. During continuous operation, the pressure sensor generates heat loss, which accumulates inside the sensor. This makes the pressure sensor prone to high-temperature anomalies and excessive temperature rise after prolonged use. Due to the lack of an independent protection structure for high-temperature anomalies of the pressure sensor, the pressure sensor and the measured medium remain in a conductive state. This can easily lead to component aging, sealing failure, and measurement malfunction, and in severe cases, damage to the pressure sensor.

[0004] To address the above issues, a protection device for pressure transmitters is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a protection device for pressure transmitters. By using this device, the problems mentioned above are solved, such as the pressure sensor being prone to high temperature abnormalities and excessive overall temperature rise after long-term use, and the pressure sensor and the measured medium always being in a conductive state, which can easily cause component aging, sealing failure, and measurement failure, and in severe cases, damage to the pressure sensor.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A protection device for a pressure transmitter includes a transmitter body. A pressure sensor is fixedly installed inside the transmitter body and electrically connected to the pressure sensor. A heat-conducting plate is also fixedly installed inside the transmitter body, with its inner wall in contact with the surface of the pressure sensor. A plurality of shape memory alloys are fixedly installed on one side of the heat-conducting plate, and a push plate is fixedly installed on one end of each shape memory alloy, slidingly connected to the inner wall of the transmitter body. A sealing component is installed inside the transmitter body at the end furthest from the pressure sensor, with a threaded ring fixedly connected to its surface and rotatably connected to the inner wall of the transmitter body. A push component is slidably connected inside the transmitter body, threadedly connected to the threaded ring and in contact with the push plate. Electromagnets are fixedly connected to both sides inside the transmitter body, and the electromagnets are electrically connected to the pressure sensor via a controller. A snap-fit ​​component is slidably installed inside the transmitter body near the electromagnets, slidingly connected to the push component.

[0007] Furthermore, two sealing rings are fixedly installed inside the transmitter body, and the sealing element is located between the two sealing rings.

[0008] Furthermore, the sealing component includes an annular plate and an annular frame rotatably connected to the surface of the annular plate. The annular plate is fixedly connected to the inside of the transmitter body, and the threaded ring is fixedly connected to the annular frame. Several sealing plates are slidably connected inside the annular plate, and the sealing plates are slidably connected to the annular frame. The sealing plates are in contact with the sealing ring.

[0009] Furthermore, several limiting grooves are provided through the surface of the annular frame.

[0010] Furthermore, a limiting post is fixedly installed on one side of the sealing plate, and the limiting post is slidably connected to the limiting groove. A slider is fixedly installed on the other side of the sealing plate, and the slider is slidably connected to the annular plate.

[0011] Furthermore, a threaded groove is provided on the inner side of the threaded ring, and the pusher is threadedly connected to the threaded groove.

[0012] Furthermore, the pusher includes a push ring and several balls rotatably connected to the surface of the push ring, with the balls in contact with the threaded groove. Several first springs are fixedly connected to one side of the push ring, and the first springs are fixedly connected to the transmitter body. Two slide plates are fixedly connected inside the push ring, and the slide plates are slidably connected to the inside of the transmitter body.

[0013] Furthermore, the inner wall of the push ring has locking grooves on both sides, and the locking parts slide and engage with the locking grooves.

[0014] Furthermore, the latching component includes a latching block and a second spring fixed to one side of the latching block. The latching block is slidably connected to the inside of the transmitter body and slidably connected to the latching groove. The second spring is fixedly connected to the inside of the transmitter body, and a magnet is fixedly installed on one side of the latching block.

[0015] Furthermore, guide blocks are fixedly installed on both sides of the card block, and the two guide blocks are slidably connected to the inside of the transmitter body.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The structure design of the heat-conducting plate being tightly attached to the surface of the pressure sensor can quickly absorb and conduct the self-heating generated by the pressure sensor without thermal resistance, accurately capture the actual temperature rise change of the sensor surface, effectively isolate the interference of external ambient temperature and the temperature of the measured fluid medium on temperature sensing and detection, and prevent false triggering of protection caused by temperature detection data distortion.

[0017] 2. The protective action is carried out through the passive mechanical core characteristics of multiple sets of shape memory alloys with thermal deformation. No additional external power supply is required. The entire protective transmission structure can be autonomously driven to complete the action by the heat generated by the pressure sensor.

[0018] 3. By using a push plate, pusher, and threaded ring, the displacement of the shape memory alloy due to heat deformation is converted into a stable linear thrust. When the pressure sensor experiences abnormal operating conditions due to excessive high temperature, the sealing component can be quickly driven to rotate and close precisely, cutting off the internal pressure medium flow channel of the transmitter in a timely manner. This blocks the continuous contact, impact, and corrosion of the pressure sensor by the measured medium under high temperature conditions from the source, effectively reducing the problem of pressure sensor damage under high temperature conditions and realizing instantaneous emergency protection against faults.

[0019] 4. The mechanical self-locking structure with sliding engagement between the snap-fit ​​component and the push component can automatically lock and limit the push component and the entire transmission sealing structure after the sealing component completes the media channel sealing action.

[0020] 5. After the pressure sensor cools down naturally, the shape memory alloy cools down and retracts, and the driving force disappears completely, the sealing component can still maintain the closed and locked state of the channel. It will not cause the sealing failure due to the shape memory alloy resetting in advance. It effectively avoids the secondary introduction of the measured medium into the sensor before the pressure sensor has fully cooled down and the internal performance has not returned to stability, which greatly improves the continuity and reliability of the high temperature protection of the device.

[0021] 6. If the pressure sensor only experiences a short-term temperature rise exceeding the limit and there is no irreversible damage to the internal components, after the self-test determines that the parameters have returned to normal, the electric control drives the electromagnet to magnetically unlock the locking structure, the device automatically springs back to reset, the medium channel is reconnected, and the transmitter body quickly resumes normal pressure detection operation. If the pressure sensor suffers permanent damage such as component aging or circuit breakage, it will remain in a locked and blocked state. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the transmitter body structure of the present invention; Figure 4 This is a schematic diagram of the sealing component structure of the present invention; Figure 5 This is a schematic diagram of the annular plate structure of the present invention; Figure 6 This is a schematic diagram of the threaded ring structure of the present invention; Figure 7 This is a schematic diagram of the sealing ring structure of the present invention; Figure 8 for Figure 7 Enlarged view at point B in the middle; Figure 9 This is a schematic diagram of the driving coil structure of the present invention.

[0023] In the diagram: 1. Transmitter body; 11. Sealing ring; 2. Pressure sensor; 3. Heat-conducting plate; 4. Shape memory alloy; 5. Push plate; 6. Sealing component; 61. Annular plate; 62. Annular frame; 621. Limiting groove; 63. Sealing plate; 631. Limiting post; 632. Slider; 7. Threaded ring; 71. Threaded groove; 8. Pushing component; 81. Pushing ring; 811. Snap-fit ​​groove; 82. Ball bearing; 83. First spring; 84. Slide plate; 9. Electromagnet; 10. Snap-fit ​​component; 101. Snap-fit ​​block; 102. Second spring; 103. Magnet block; 104. Guide block. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] To address the technical problem of pressure sensor 2 easily developing abnormal high temperatures and excessive overall temperature rise after prolonged use, and the fact that pressure sensor 2 maintains a continuous conductive state with the measured medium, which can easily lead to component aging, seal failure, and measurement malfunction, and in severe cases, damage to pressure sensor 2, such as... Figures 1-9 As shown, the following preferred technical solutions are provided: like Figure 1 and Figure 2As shown, a protection device for a pressure transmitter includes a transmitter body 1. A pressure sensor 2 is fixedly installed inside the transmitter body 1 and is electrically connected to the transmitter body 1. The pressure sensor 2, as a core detection element, has a self-test function and can sense and collect the pressure parameters of the measured fluid medium in real time. Through electrical connection, it realizes signal transmission and data feedback, ensuring the continuous online monitoring function of the transmitter body 1. The independently fixed installation structure reduces external vibration interference, ensures pressure detection accuracy, and provides the electrical foundation for subsequent temperature monitoring, self-test feedback, and electronic control linkage. A heat-conducting plate 3 is also fixedly installed inside the transmitter body 1, and the inner wall of the heat-conducting plate 3 is flush with the surface of the pressure sensor 2. The heat-conducting plate 3 is in close contact with the surface of the pressure sensor 2, which can quickly absorb and conduct the heat accumulated by the pressure sensor 2 during long-term operation, reduce the thermal conduction resistance, accurately sense the actual temperature change of the pressure sensor 2 surface, and avoid misjudgment caused by ambient temperature and medium temperature. Several shape memory alloys 4 are fixedly installed on one side of the heat-conducting plate 3. The use of multiple sets of shape memory alloys 4 working together results in stronger thermal deformation driving force and more stable action response. Relying on the passive mechanical characteristics of the shape memory alloy 4 thermal deformation, no additional power supply or electronic sensing components are required. Automatic action can be completed by relying on heat drive. It has the advantages of explosion-proof, moisture and heat resistance, and anti-interference. It is suitable for high-risk explosion-proof working conditions such as chemical and power industries. The structure is durable and has a low failure rate.

[0026] A push plate 5 is fixedly installed at one end of the shape memory alloy 4. The push plate 5 serves as an intermediate transmission transition component, which can convert the deformation displacement of the shape memory alloy 4 into a smooth linear sliding force, resulting in uniform force distribution and smooth transmission. The sliding limit structure can restrict the movement trajectory, prevent deviation and jamming, ensure the concentrated output of the driving force of multiple shape memory alloys 4, improve the smoothness and stability of mechanical transmission, and avoid transmission failure. The push plate 5 is slidably connected to the inner wall of the transmitter body 1. A sealing component 6 is installed at the end of the transmitter body 1 away from the pressure sensor 2. The sealing component 6 can selectively block the pressure channel without interfering with normal medium flow and sensor detection operation. Under abnormal high-temperature conditions, it can quickly block the medium from continuing to contact the pressure sensor 2, isolating the medium from impact, corrosion and heat conduction from the source. A threaded ring 7 is fixedly connected to the surface of the sealing component 6, and the threaded ring 7 is rotatably connected to the inner wall of the transmitter body 1. Through the rotational movement of the threaded ring 7, the sealing component 6 can be synchronously driven to rotate and open and close precisely, realizing the switching between channel conduction and blockage. The structure is compact and the rotation positioning is accurate, ensuring the sealing performance after the blockage is closed.

[0027] Inside the transmitter body 1, a pusher 8 is slidably connected, and the pusher 8 is threadedly connected to a threaded ring 7. The pusher 8 contacts a pusher plate 5. Utilizing the linear sliding of the pusher 8 in conjunction with the threaded transmission of the threaded ring 7, linear thrust is converted into rotational power. The pusher plate 5 directly abuts against the drive, resulting in direct and efficient power transmission. This allows for rapid driving of the threaded ring 7 and the sealing component 6 to complete the sealing action. The mechanical linkage logic is closed-loop, providing a fast response speed. Electromagnets 9 are fixedly connected to both sides inside the transmitter body 1, and these electromagnets 9 are electrically connected to the pressure sensor 2 via a controller. The electromagnets 9, relying on the controller (which is existing technology and not shown in the figure), form an intelligent electrical linkage with the pressure sensor 2. This linkage can be adjusted based on the operating status, self-test signal, and temperature parameters of the pressure sensor 2. The automated electronic control system can accurately execute unlocking control commands, distinguishing between normal cooling and permanent damage conditions of pressure sensor 2, and achieving intelligent differentiated protection control. Inside the transmitter body 1, a latching component 10 is slidably installed near the electromagnet 9, and the latching component 10 is slidably connected to the pusher 8. The latching component 10 can form a sliding latching limit on the pusher 8 after action, realizing mechanical self-locking in the blocking state. Even if the shape memory alloy 4 cools down and resets and the driving force disappears, the channel can still be continuously blocked, preventing the medium from re-entering when the sensor has not fully cooled down and recovered. The sliding fit structure is flexible and can quickly complete the latching and unlocking switching under the drive of the electromagnet 9, taking into account both self-locking protection and automatic reset functions, greatly improving the continuous protection and safety of the device.

[0028] First, the transmitter body 1 is installed on the pipeline or tank. The pressure sensor 2 is fixedly installed inside the transmitter body 1. As the core detection element, the pressure sensor 2 is used to continuously contact the measured medium and collect the pressure data of the fluid medium inside the pipeline and tank in real time, completing long-term online monitoring of the operating pressure. The heat-conducting plate 3 is tightly attached to and covers the outer surface of the pressure sensor 2, which can quickly conduct the heat generated by the pressure sensor 2 during operation. Several shape memory alloys 4 are fixedly installed on one side of the heat-conducting plate 3, which can accurately sense the surface temperature change of the pressure sensor 2. Under normal operating conditions, the temperature of the pressure sensor 2 is within a reasonable range, the shape memory alloys 4 maintain their initial contracted shape and have no deformation output, the push plate 5 and the push component 8 are both in the initial static position, the sealing component 6 is fully open, the internal pressure channel of the transmitter body 1 is unobstructed, the measured medium is normally introduced and comes into contact with the pressure sensor 2, and the device maintains the normal pressure detection operation state.

[0029] When pressure sensor 2 operates continuously for a long time, it generates heat due to its own circuit power consumption, resulting in excessive temperature rise and abnormal high temperature. The heat generated on the surface of pressure sensor 2 is quickly and concentratedly conducted to shape memory alloy 4 through the heat-conducting plate 3. After the shape memory alloy 4 reaches the phase change temperature, it undergoes shape deformation, changing from its original contracted and bent state to a straightened and unfolded state. This, in turn, pushes the push plate 5, which is fixedly connected to it, to slide smoothly along the inner wall of the transmitter body 1. After the push plate 5 moves, it directly presses against the push member 8 and slides synchronously. The push member 8 and the threaded ring 7 are connected by a threaded engagement. Under the transmission action of the axial movement of the push member 8, the threaded ring 7 is driven to rotate along the inner wall of the transmitter body 1. The threaded ring 7 synchronously drives the sealing member 6 to rotate as a whole, so that the sealing member 6 seals the medium flow channel of the transmitter body 1. The rapid interruption of the pressure path prevents the measured medium from continuing to contact and impact the pressure sensor 2, thus protecting the pressure sensor 2. After the pusher 8 slides into place and the sealing member 6 completes the sealing action, the snap-fit ​​member 10, which is slidably installed inside the transmitter body 1, automatically forms a sliding snap-fit ​​limit with the pusher 8, stably locking the pusher 8, threaded ring 7, and sealing member 6 in the sealing position. Even if the pressure sensor 2 cools down and the temperature gradually drops, the shape memory alloy 4 cools down, shrinks, and resets to its initial shape, pulling the pusher plate 5 back to its original position, the pusher 8 will not rebound in the opposite direction as the shape memory alloy 4 resets due to the locking and limiting effect of the snap-fit ​​member 10. The sealing member 6 continues to maintain the channel sealing state, preventing the medium from being introduced again before the pressure sensor 2 has fully cooled down and its performance has recovered, thus avoiding secondary high-temperature damage and structural impact.

[0030] The pressure sensor 2 has a built-in self-test module that continuously monitors the operating status of its components, sealing structure, and circuitry, and forms an electrical linkage control with the electromagnet 9 through the controller. If the self-test results indicate that the pressure sensor 2 has no internal damage, all parameters have returned to normal, and it can be put back into use, the controller triggers the electromagnet 9 to work, the magnetic drive latch 10 slides out of its latching engagement with the pusher 8, and the mechanical lock is released; after unlocking, the pusher 8 rebounds and resets due to its own elastic structure, driving the threaded ring 7 to rotate in the opposite direction, causing the sealing part 6 to rotate synchronously and open the medium channel, restoring the device to normal medium conduction and pressure detection functions. If the pressure sensor 2 experiences abnormal high temperature, causing irreversible damage such as aging of internal components and circuit damage, the self-test module determines that the equipment cannot work normally, and the controller controls the electromagnet 9 to remain in standby mode, the latch 10 continuously locks the pusher 8, and the sealing part 6 permanently closes the medium channel, forcibly isolating the medium and locking the protection state, reminding the staff to promptly inspect and replace the pressure sensor 2 to avoid measurement failure and production safety hazards caused by the faulty equipment operating with defects. Therefore, it relies on the heat-conducting plate 3 for bonding. The heat-conducting structure can accurately collect the real-time surface temperature of the pressure sensor 2. Utilizing the passive mechanical properties of the thermally deformable shape memory alloy 4, the transmission structure is automatically triggered when the sensor experiences excessively high temperatures during long-term operation. This quickly drives the sealing component 6 to isolate the medium passage, promptly terminating the continuous contact between the medium and the high-temperature sensor. This avoids the problems of high temperatures accelerating the aging of the seal, diaphragm deformation, and circuit burnout from the source. Through the locking and limiting cooperation between the snap-fit ​​component 10 and the push component 8, a self-locking function is formed in the sealing state. The sealing will not be canceled due to the sensor's temporary cooling or the premature reset of the shape memory alloy 4. It ensures that the pressure sensor 2 is fully cooled and the operating conditions are stable before the isolation is released. This prevents secondary damage caused by repeated impacts from the medium when the pressure sensor 2 has not fully recovered. The protection continuity and reliability are higher. When the pressure sensor 2 is damaged by high temperature and cannot be used normally, the device can continuously maintain the medium sealing state and forcibly shut down the faulty measuring point to avoid process control errors due to measurement failure.

[0031] like Figure 3 and Figure 7 As shown, two sealing rings 11 are fixedly installed inside the transmitter body 1, and the sealing member 6 is located between the two sealing rings 11. The double sealing rings 11 form a double sealing barrier. When the sealing member 6 is rotated to close and cuts off the medium channel inside the transmitter body 1, it can fit tightly with the outer wall of the sealing member 6, which greatly improves the sealing tightness of the contact surface.

[0032] like Figure 4 and Figure 5As shown, the sealing component 6 includes an annular plate 61 and an annular frame 62 rotatably connected to the surface of the annular plate 61. The annular plate 61 is fixedly connected to the inside of the transmitter body 1, and the threaded ring 7 is fixedly connected to the annular frame 62. Several sealing plates 63 are slidably connected inside the annular plate 61, and the sealing plates 63 are slidably connected to the annular frame 62. The sealing plates 63 are in contact with the sealing ring 11. Under normal measurement conditions, the annular frame 62 is in the initial rotation position, the sealing plates 63 are staggered, the central flow hole is completely open, the medium channel remains unobstructed, and the measured medium can flow normally and contact the pressure sensor 2 without affecting the normal pressure detection. When the pressure sensor 2 is abnormally hot and triggers the protection mechanism, the pushing component 8 moves axially to drive the threaded ring 7 to rotate. 7 synchronously drives the annular frame 62 to rotate circumferentially around the relatively fixed annular plate 61. Relying on the sliding limit cooperation between the annular frame 62 and the sealing plate 63, the rotational motion of the annular frame 62 is converted into the radial convergence and sliding of multiple sealing plates 63. Multiple sets of sealing plates 63 synchronously contract and approach the center, splicing and fitting together to form a closed structure similar to an iris, thereby completely blocking and isolating the medium flow channel in the middle of the annular plate 61. Conversely, when the equipment fault is resolved and normal operation needs to be restored, the threaded ring 7 rotates in the opposite direction, driving the annular frame 62 to rotate and reset, thereby pulling each sealing plate 63 to synchronously slide outward radially and unfold. The flow gap is re-formed between the sealing plates 63, the medium channel is reopened, and the pressure transmitter resumes normal medium conduction and pressure monitoring operations.

[0033] The surface of the annular frame 62 is provided with several limiting grooves 621. The limiting grooves 621 can form a sliding engagement with the end of the sealing plate 63, which precisely limits the movement path of the sealing plate 63. This ensures that the sealing plate 63 can only be radially retracted or outwardly extended according to the preset trajectory of the limiting grooves 621, preventing the sealing plate 63 from deviating, tilting, or swinging out of place, and ensuring that the multiple sets of sealing plates 63 move synchronously and act in a consistent manner.

[0034] A limiting post 631 is fixedly installed on one side of the sealing plate 63. The limiting post 631 is slidably connected to the limiting groove 621. A slider 632 is fixedly installed on the other side of the sealing plate 63. The slider 632 is slidably connected to the annular plate 61. The annular plate 61 is a fixed structure. Its internal hexagonal groove forms a fixed direction motion constraint on the slider 632, so that the sealing plate 63 can only slide back and forth in a straight line along the preset radial direction of the hexagonal groove. It cannot deflect, twist or shift laterally. When the threaded ring 7 drives the annular frame 62 to rotate circumferentially, the limiting groove 621 on the annular frame 62 rotates synchronously. The side wall of the groove presses against and pulls the limiting post 631. Using the trajectory guidance of the limiting groove 621, the circumferential rotation of the annular frame 62 is converted into the position offset driving force of the limiting post 631. Combined with the directional limiting guidance of the slider 632 on the other side and the hexagonal groove of the annular plate 61, the entire sealing plate 63 is forced to stably retract inward or expand outward along the radial direction.

[0035] like Figure 6 and Figure 9 As shown, a threaded groove 71 is provided on the inner side of the threaded ring 7, and the pusher 8 is threadedly connected to the threaded groove 71. Relying on the helical guiding effect of the threaded groove 71, the linear feed motion of the pusher 8 is efficiently converted into the circumferential rotation motion of the threaded ring 7, thereby driving the annular frame 62 and the sealing plate 63 to complete the closing and sealing. In the unlocking and reset stage, the pusher 8 retracts axially in the opposite direction, and with the reverse transmission of the threaded groove 71, the threaded ring 7 is driven to rotate, so that the sealing structure is reopened.

[0036] like Figure 8 and Figure 9 As shown, the pusher 8 includes a push ring 81 and several balls 82 rotatably connected to the surface of the push ring 81. The balls 82 are in contact with the threaded groove 71. The rotatable rolling contact of the balls 82 replaces the traditional sliding friction of the hard-faced thread, transforming sliding friction into rolling friction, significantly reducing the motion resistance between the balls 82 and the threaded groove 71. Several first springs 83 are fixedly connected to one side of the push ring 81, and the first springs 83 are fixedly connected to the transmitter body 1. Two sliding plates 84 are fixedly connected inside the push ring 81, and the sliding plates 84 are slidably connected to the inside of the transmitter body 1. When the pressure sensor 2 experiences an abnormal high temperature, the shape memory alloy 4 deforms and straightens due to heat, pushing the push plate 5 to move linearly. The push plate 5 presses against the push ring 81, overcoming the sliding resistance and threaded transmission resistance, causing the push ring 81 to compress the first springs 83 axially and move synchronously. During the movement of the push ring 81, the outer balls 82 roll inside the threaded groove 71, compressing the linear motion of the push ring 81 smoothly. The rotational motion of the threaded ring 7 drives the annular frame 62 and the sealing plate 63 in sequence, completing the channel convergence and sealing. The position is locked by the snap-fit ​​component 10. After the pressure sensor 2 passes inspection and the controller controls the electromagnet 9 to release the snap-fit ​​limit of the snap-fit ​​component 10, the reset force of the first spring 83 is preset to be greater than the rolling friction between the ball 82 and the threaded groove 71, the sliding friction between the slide plate 84 and the inner wall of the transmitter body 1, the sliding friction between the limit post 631 and the limit groove 621, and the sliding friction between the slider 632 and the hexagonal groove of the annular plate 61. Therefore, the first spring 83 can stably release elastic potential energy and push the push ring 81 axially back to reset. During the retraction process, the ball 82 rolls in the opposite direction along the threaded groove 71, driving the threaded ring 7 to rotate in the opposite direction. With the low friction linkage of each sliding pair, all the sealing plates 63 are driven to expand outward synchronously, so that the sealing structure is completely reset, the medium channel is reconnected, and the device returns to the normal pressure detection working state.

[0037] The inner wall of the push ring 81 has locking grooves 811 on both sides, and the locking member 10 slides and locks into the locking grooves 811. Through the embedded locking cooperation between the locking grooves 811 and the locking member 10, the push ring 81 after the sealing stroke is completed can be reliably limited and fixed, effectively limiting the axial rebound displacement of the push ring 81, avoiding the push member 8 from falling off due to factors such as the cooling and reset of the shape memory alloy 4, the impact of medium pressure, and equipment vibration, ensuring that the sealing plate 63 remains in a closed state for a long time, and achieving continuous isolation and protection before the pressure sensor 2 is completely cooled and repaired.

[0038] To address the technical challenge of re-introducing the measured medium and impacting the pressure sensor 2 before it has fully cooled down and its internal performance has stabilized, and to significantly improve the continuity and reliability of the device's high-temperature protection, such as... Figure 8 and Figure 9 As shown, the following preferred technical solutions are provided: like Figure 8 and Figure 9 As shown, the latching component 10 includes a latching block 101 and a second spring 102 fixed to one side of the latching block 101. The latching block 101 is slidably connected to the inside of the transmitter body 1 and to the latching groove 811. The second spring 102 is fixedly connected to the inside of the transmitter body 1. A magnet block 103 is fixedly installed on one side of the latching block 101. Under normal conditions without electromagnetic attraction, the second spring 102 maintains an elastic pushing state, continuously pushing the latching block 101 towards the pushing ring 81, so that the latching block 101 can automatically embed into the latching groove 811, forming a sliding latching limit, axially locking the pushing ring 81 after sealing, keeping the sealing component 6 closed for a long time, and achieving self-locking protection under high temperature conditions. When the temperature of the pressure sensor 2 returns to normal and the self-test is qualified, the latching component 101 is locked in the same position. When it can be put back into use, the controller controls the electromagnet 9 to be energized and generate magnetism. The electromagnet 9 generates a magnetic attraction to the magnet block 103, which overcomes the elastic pushing force of the second spring 102 and pulls the locking block 101 to compress the second spring 102 and retract synchronously, so that the locking block 101 is disengaged from the locking groove 811 and the locking lock on the push ring 81 is released. At this time, the push ring 81 loses the limit constraint and can be retracted and reset under the action of the reset elastic force of the first spring 83, which drives the sealing structure to open. When the pressure sensor 2 is damaged by high temperature and the self-test determines that it is unusable, the electromagnet 9 remains de-energized and non-magnetic. The magnet block 103 is not magnetically attracted. The second spring 102 continues to push the locking block 101 into the locking groove 811, maintaining a permanent locked sealing state, waiting for manual inspection and replacement.

[0039] Guide blocks 104 are fixedly installed on both sides of the card block 101. The two guide blocks 104 are slidably connected to the inside of the transmitter body 1. Through the synchronous limiting constraint of the guide blocks 104 on both sides, the lateral displacement, vertical movement and angular deflection of the card block 101 are effectively limited, so that the card block 101 maintains horizontal linear sliding throughout the entire process.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A protection device for a pressure transmitter, comprising a transmitter body (1), characterized in that: A pressure sensor (2) is fixedly installed inside the transmitter body (1), and the pressure sensor (2) is electrically connected to the transmitter body (1). A heat-conducting plate (3) is also fixedly installed inside the transmitter body (1), and the inner wall of the heat-conducting plate (3) is in contact with the surface of the pressure sensor (2). Several shape memory alloys (4) are fixedly installed on one side of the heat-conducting plate (3), and a push plate (5) is fixedly installed on one end of the shape memory alloys (4). The push plate (5) is slidably connected to the inner wall of the transmitter body (1). A sealing component (6) is installed inside the transmitter body (1) at the end away from the pressure sensor (2). A threaded ring (7) is fixedly connected to the surface of the transmitter body (1), and the threaded ring (7) is rotatably connected to the inner wall of the transmitter body (1). A pusher (8) is slidably connected inside the transmitter body (1), and the pusher (8) is threadedly connected to the threaded ring (7). The pusher (8) is in contact with the pusher plate (5). Electromagnets (9) are fixedly connected to both sides inside the transmitter body (1), and the electromagnets (9) are electrically connected to the pressure sensor (2) through the controller. A snap-fit ​​(10) is slidably installed inside the transmitter body (1) on the side close to the electromagnet (9), and the snap-fit ​​(10) is slidably connected to the pusher (8).

2. The protection device for a pressure transmitter according to claim 1, characterized in that: The transmitter body (1) has two sealing rings (11) fixedly installed inside, and the sealing component (6) is located between the two sealing rings (11).

3. A protection device for a pressure transmitter according to claim 2, characterized in that: The sealing component (6) includes an annular plate (61) and an annular frame (62) rotatably connected to the surface of the annular plate (61). The annular plate (61) is fixedly connected to the inside of the transmitter body (1), and the threaded ring (7) is fixedly connected to the annular frame (62). Several sealing plates (63) are slidably connected inside the annular plate (61), and the sealing plates (63) are slidably connected to the annular frame (62). The sealing plates (63) are in contact with the sealing ring (11).

4. A protection device for a pressure transmitter according to claim 3, characterized in that: The surface of the annular frame (62) is provided with several limiting grooves (621).

5. A protection device for a pressure transmitter according to claim 4, characterized in that: A limiting post (631) is fixedly installed on one side of the sealing plate (63), and the limiting post (631) is slidably connected to the limiting groove (621). A slider (632) is fixedly installed on the other side of the sealing plate (63), and the slider (632) is slidably connected to the annular plate (61).

6. A protection device for a pressure transmitter according to claim 1, characterized in that: The inner side of the threaded ring (7) is provided with a threaded groove (71), and the pusher (8) is threadedly connected to the threaded groove (71).

7. A protection device for a pressure transmitter according to claim 6, characterized in that: The pusher (8) includes a push ring (81) and several balls (82) rotatably connected to the surface of the push ring (81), and the balls (82) are in contact with the threaded groove (71). Several first springs (83) are fixedly connected to one side of the push ring (81), and the first springs (83) are fixedly connected to the transmitter body (1). Two slide plates (84) are fixedly connected inside the push ring (81), and the slide plates (84) are slidably connected to the inside of the transmitter body (1).

8. A protection device for a pressure transmitter according to claim 7, characterized in that: The inner wall of the push ring (81) is provided with snap-fit ​​grooves (811) on both sides, and the snap-fit ​​part (10) is slidably snapped into the snap-fit ​​grooves (811).

9. A protection device for a pressure transmitter according to claim 8, characterized in that: The latching component (10) includes a latching block (101) and a second spring (102) fixed on one side of the latching block (101). The latching block (101) is slidably connected to the inside of the transmitter body (1), the latching block (101) is slidably connected to the latching groove (811), the second spring (102) is fixedly connected to the inside of the transmitter body (1), and a magnet block (103) is fixedly installed on one side of the latching block (101).

10. A protection device for a pressure transmitter according to claim 9, characterized in that: Guide blocks (104) are fixedly installed on both sides of the card block (101), and the two guide blocks (104) are slidably connected to the inside of the transmitter body (1).

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