Pressure sensor temperature drift calibration device

Abstract

The utility model discloses a pressure sensor temperature drift calibration device, which relates to the technical field of sensor detection and temperature calibration and comprises a protective shell, a sensor assembly is fixedly mounted in the protective shell and comprises a pressure sensor body, and a heat dissipation assembly is fixedly mounted on the outer wall of the pressure sensor body. According to the device of the utility model, the response of the corrugated sleeve to the temperature change is utilized to drive the cooling liquid to automatically circulate, so that the uniform cooling of the pressure sensor body is realized, the temperature drift error is significantly reduced, and the service life of the pressure sensor body is prolonged. Through a fluid closed-loop heat exchange structure of a heat dissipation annular cylinder, a cooling cylinder and a double-ball valve, air cooling enhanced heat dissipation is combined, the temperature of cooling liquid is ensured to be stable, constant-temperature work of a sensor is maintained, through linkage control of a slide rheostat and a motor, self-adaptive adjustment and energy-saving closed loop of the air cooling strength are achieved, the measurement precision is improved, and the service life of the device is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of sensor detection and temperature calibration technology, specifically a pressure sensor temperature drift calibration device. Background Technology

[0002] Existing pressure sensors often experience temperature drift errors in their output signals due to changes in ambient temperature during long-term use. When the sensor is in a high-temperature or large-temperature-difference environment, the thermal expansion and contraction of the internal sensitive element will cause changes in the resistance value of the strain gauge or bridge, resulting in a shift in the measurement signal and affecting the measurement accuracy. Especially in industrial sites or experimental testing scenarios, sensors are often exposed to high-temperature airflow or heat conduction components for a long time. If temperature compensation or heat dissipation control is not performed in a timely and effective manner, the zero-point output and sensitivity of the sensor will become unstable, leading to large errors in the measurement data.

[0003] To reduce the impact of temperature on the performance of pressure sensors, existing technologies mostly employ circuit compensation or software correction methods. For example, temperature sensing elements are embedded inside the sensor, and the signal output is corrected through calculation formulas. However, such solutions mostly rely on electronic compensation, which cannot eliminate the physical deformation or thermal stress accumulation of the sensor body caused by temperature rise in real time, thus limiting the compensation effect. At the same time, although some simple heat dissipation devices can reduce the sensor temperature to a certain extent, they generally suffer from problems such as lag in heat dissipation response, low temperature control accuracy, and uneven heat exchange, making it difficult to maintain stable operation under complex working conditions. Utility Model Content

[0004] The purpose of this invention is to provide a pressure sensor temperature drift calibration device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A pressure sensor temperature drift calibration device includes a protective housing, a sensor assembly fixedly installed inside the protective housing, the sensor assembly including a pressure sensor body, a heat dissipation assembly fixedly installed on the outer wall of the pressure sensor body, a temperature sensing assembly fixedly installed at the top of the heat dissipation assembly, and a wind-cooling assembly fixedly installed at the bottom of the heat dissipation assembly.

[0007] The heat dissipation assembly includes a heat dissipation annular cylinder, which is coaxially and fixedly sleeved on the outer wall of the pressure sensor body. Two upper tubes and two lower tubes are respectively installed at the top and bottom ends of the outer wall of the heat dissipation annular cylinder.

[0008] A first guide pipe is fixedly installed at the ends of the two upper tubes away from the heat dissipation annular cylinder, and a second guide pipe is fixedly installed at the ends of the two lower tubes away from the heat dissipation annular cylinder.

[0009] The temperature sensing component includes a heat insulation cylinder. Two first connection ports are opened on the outer wall of the heat insulation cylinder near the bottom. The ends of the two first guide tubes away from the two upper tubes are respectively fixedly connected to the two first connection ports.

[0010] Furthermore, a first ball valve and a second ball valve are slidably installed on the inner walls of the two lower pipes, respectively. A first spring is fixedly installed on the outer wall of the first ball valve, and a second spring is fixedly installed on the outer wall of the second ball valve.

[0011] Furthermore, a first piston is slidably installed inside the insulation cylinder, and two connecting rods are fixedly installed on the top surface of the first piston. The ends of the two connecting rods away from the first piston pass through the top surface of the insulation cylinder and are then fixedly installed with mounting plates.

[0012] Furthermore, a corrugated sleeve is coaxially fixedly installed on the top surface of the mounting plate, and the top surface of the corrugated sleeve is fixedly installed on the inner top surface of the protective shell.

[0013] Furthermore, a drive ring is fixedly installed on both connecting rods, and a sliding rheostat is fixedly installed on the top surface of the insulation cylinder, with the sliding plate of the rheostat being fixedly connected to the drive ring.

[0014] Furthermore, the air-cooled assembly includes a cooling cylinder, with two second connection ports opened on the outer wall of the cooling cylinder near the top. The ends of two second guide pipes away from the two lower pipes are respectively fixedly connected to the two second connection ports, and a second piston is slidably connected to the inner wall of the cooling cylinder.

[0015] Furthermore, the air-cooling assembly also includes a fan, which is fixedly mounted on the bottom surface of the protective housing. The fan shaft is fixedly connected to the output shaft of the motor, and the motor is electrically connected to the sliding rheostat.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. When the device of this utility model is in use, the pressure sensor body temperature can be automatically adjusted by the response of the expansion oil inside the corrugated sleeve to the external temperature change. When the temperature rises, the corrugated sleeve expands in volume, and the first piston moves down through the mounting plate and connecting rod, which automatically presses the coolant inside the insulation cylinder into the heat dissipation annular cylinder, so that the coolant surrounds the outer wall of the pressure sensor body to form a uniform cooling layer, thereby effectively reducing the surface temperature of the pressure sensor body and reducing the drift error of the sensor caused by temperature changes.

[0018] 2. When the device of this utility model is in use, the fluid circulation between the heat dissipation annular cylinder, the cooling cylinder and the double ball valve structure realizes the closed-loop heat exchange and self-circulation of the coolant. When the hydraulic pressure inside the heat dissipation annular cylinder rises, the high-temperature coolant pushes the first ball valve to open and enter the cooling cylinder. The second piston moves down with the hydraulic pressure, so that the coolant and the copper cylinder can fully exchange heat. The heat is quickly conducted to the outside through the copper wall. The fan in the air-cooling component runs at high speed under the drive of the motor, forming airflow to enhance the heat dissipation effect and further improve the cooling rate. Through the synergistic cooling of liquid and gas, the temperature of the coolant is kept stable, thereby maintaining the constant temperature working environment of the pressure sensor body.

[0019] 3. In use, the device of this utility model achieves automatic adjustment of air cooling intensity and energy-saving closed-loop through the linkage control of the sliding rheostat and the motor. When the temperature rises, the corrugated sleeve pushes the drive ring to move down, which drives the sliding plate of the sliding rheostat to move down, thereby reducing the circuit resistance and increasing the fan speed, thus enhancing the heat dissipation effect. When the temperature drops, the resistance of the sliding rheostat increases, the output power of the motor weakens, and the air cooling gradually slows down until it stops, realizing adaptive adjustment. The coolant flows back to the insulation cylinder under negative pressure, completing the system reset and entering the standby state. Through the dual feedback control of mechanical hydraulic and electrical linkage, this device can automatically realize the entire process of heat dissipation, speed adjustment and cycle reset when the temperature changes, significantly improving the temperature stability and measurement accuracy of the pressure sensor, and enhancing the intelligence level and service life of the device. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is an exploded view of the overall structure of this utility model;

[0022] Figure 3 This is an exploded view of the sensor assembly structure of this utility model;

[0023] Figure 4 This is an exploded view of the heat dissipation component structure of this utility model;

[0024] Figure 5 This is an exploded view of the temperature sensing component structure of this utility model;

[0025] Figure 6 This is an exploded view of the air-cooled component structure of this utility model;

[0026] Figure 7 This is a cross-sectional view of the overall structure of this utility model;

[0027] Figure 8 for Figure 7 Enlarged view of the structure at point A in the image.

[0028] In the picture:

[0029] 1. Protective casing;

[0030] 2. Sensor assembly; 21. Pressure sensor body; 22. Thermally conductive housing;

[0031] 3. Heat dissipation assembly; 31. Heat dissipation annular cylinder; 311. Upper tube; 312. Lower tube; 32. First guide tube; 33. Second guide tube; 34. First ball valve; 35. First spring; 36. Second ball valve; 37. Second spring;

[0032] 4. Temperature sensing component; 41. Insulation cylinder; 411. First connection port; 42. First piston; 421. Connecting rod; 422. Mounting plate; 423. Drive ring; 43. Corrugated sleeve; 44. Sliding rheostat;

[0033] 5. Air-cooled assembly; 51. Cooling cylinder; 511. Second connection port; 52. Second piston; 53. Fan; 54. Motor. Detailed Implementation

[0034] 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.

[0035] Example 1: Please refer to Figures 1-4 A pressure sensor temperature drift calibration device includes a protective housing 1, a sensor assembly 2 fixedly installed inside the protective housing 1, and a pressure sensor body 21. Specifically, a heat-conducting housing 22 is fixedly sleeved on the outer wall of the pressure sensor body 21. The heat-conducting housing 22 is made of copper, which has good thermal conductivity and can exchange the heat generated inside the pressure sensor body 21 in a timely manner. A heat dissipation assembly 3 is fixedly installed on the outer wall of the pressure sensor body 21. A temperature sensing assembly 4 is fixedly installed at the top of the heat dissipation assembly 3, and a wind-cooling assembly 5 is fixedly installed at the bottom of the heat dissipation assembly 3.

[0036] The heat dissipation assembly 3 includes a heat dissipation annular cylinder 31, which is coaxially and fixedly sleeved on the outer wall of the pressure sensor body 21. Two upper tubes 311 and two lower tubes 312 are respectively installed at the top and bottom ends of the outer wall of the heat dissipation annular cylinder 31. A first guide tube 32 is fixedly installed at the end of each of the two upper tubes 311 away from the heat dissipation annular cylinder 31, and a second guide tube 33 is fixedly installed at the end of each of the two lower tubes 312 away from the heat dissipation annular cylinder 31. Specifically, the inner wall of the protective shell 1 is welded and fixed with... A fixed bracket is used, and a heat dissipation annular cylinder 31 is fixedly installed on the inner wall of the fixed bracket. A flow guiding space is provided inside the heat dissipation annular cylinder 31, which is filled with coolant. Two upper pipes 311 and two lower pipes 312 are all connected to the interior of the heat dissipation annular cylinder 31. A first ball valve 34 and a second ball valve 36 are slidably installed on the inner walls of the two lower pipes 312, respectively. A first spring 35 is fixedly installed on the outer wall of the first ball valve 34, and a second spring 37 is fixedly installed on the outer wall of the second ball valve 36. For details, please refer to [link / reference]. Figure 4 , Figure 7 , Figure 8 Both lower tubes 312 have abutment rings and fixing rings fixedly installed on their inner walls. The abutment ring inside one lower tube 312 is far away from the heat dissipation annular cylinder 31, while its fixing ring is close to the heat dissipation annular cylinder 31. The abutment ring inside the other lower tube 312 is close to the heat dissipation annular cylinder 31, while its fixing ring is far away from the heat dissipation annular cylinder 31. The outer walls of the first ball valve 34 and the second ball valve 36 abut against the two abutment rings respectively. The end of the first spring 35 away from the first ball valve 34 is fixedly connected to the fixing ring, and the end of the second spring 37 away from the second ball valve 36 is fixedly connected to the fixing ring, forming two one-way valves to control the entry and exit of coolant inside the heat dissipation annular cylinder 31.

[0037] Example 2: Please refer to Figures 2-8A pressure sensor temperature drift calibration device differs from Embodiment 1 in that the temperature sensing component 4 includes a heat insulation cylinder 41. Two first connection ports 411 are opened on the outer wall of the heat insulation cylinder 41 near its bottom. The ends of two first guide pipes 32 away from the two upper pipes 311 are respectively fixedly connected to the two first connection ports 411. Specifically, the outer layer of the heat insulation cylinder 41 is covered with heat insulation material, and the inside of the heat insulation cylinder 41 is filled with coolant to ensure that the internal coolant is not affected by the external temperature and to ensure cooling efficiency. A first piston 42 is slidably installed inside the heat insulation cylinder 41. Two connecting rods 421 are fixedly installed on the top surface of the first piston 42. The ends of the two connecting rods 421 away from the first piston 42 pass through the top surface of the heat insulation cylinder 41 and are fixedly installed with an mounting plate 422. A corrugated sleeve 43 is coaxially fixedly installed on the top surface of the mounting plate 422. The top surface of the corrugated sleeve 43 is fixedly installed on the inner top surface of the protective shell 1. Specifically, the corrugated sleeve 43 is made of rubber, and the inside of the corrugated sleeve 43 is filled with... The bellows 43 is filled with expanding oil, which has the characteristic of expanding when heated. When the bellows 43 senses an increase in the external temperature, the expanding oil inside the bellows 43 absorbs heat and expands in volume. The bottom end of the bellows 43 pushes the first piston 42 downward through the mounting plate 422 and the connecting rod 421. The first piston 42 discharges the coolant inside the insulation cylinder 41 into the heat dissipation annular cylinder 31 through two first guide pipes 32, thereby dissipating heat from the pressure sensor body 21. The two connecting rods 421 are jointly fixedly mounted with a drive ring 423. A sliding rheostat 44 is fixedly mounted on the top surface of the insulation cylinder 41. The sliding plate of the sliding rheostat 44 is fixedly connected to the drive ring 423. Specifically, one end of the sliding rheostat 44 is electrically connected to an external power supply through a wire. When the bottom end of the bellows 43 pushes the first piston 42 downward through the mounting plate 422 and the connecting rod 421, the sliding plate of the sliding rheostat 44 is also driven downward by the drive ring 423, thereby reducing the resistance of the sliding rheostat 44 in the circuit.

[0038] The air-cooled assembly 5 includes a cooling cylinder 51. Two second connection ports 511 are located near the top of the outer wall of the cooling cylinder 51. The ends of two second guide pipes 33, away from the two lower pipes 312, are fixedly connected to the two second connection ports 511. A second piston 52 is slidably connected to the inner wall of the cooling cylinder 51. Specifically, the cooling cylinder 51 is connected to the two lower pipes 312 of the heat dissipation annular cylinder 31 via the two second guide pipes 33. When the expansion oil inside the corrugated sleeve 43 absorbs heat and expands, the coolant inside the heat dissipation annular cylinder 31 increases. The superheated coolant originally stored inside the heat dissipation annular cylinder 31 pushes open the first ball valve 34, compresses the first spring 35, and finally... The coolant enters the cooling cylinder 51 through one of the second guide pipes 33. The second piston 52 moves downward. A retaining ring is welded and fixed to the bottom of the inner wall of the cooling cylinder 51 to prevent the second piston 52 from slipping. The cooling cylinder 51 is made of copper, which has good thermal conductivity and can exchange the heat inside the coolant with the outside in a timely manner. The air-cooled assembly 5 also includes a fan 53, which is fixedly installed on the bottom surface of the protective shell 1. The shaft of the fan 53 is fixedly connected to the output shaft of the motor 54. The motor 54 is electrically connected to the sliding rheostat 44 through a wire. Specifically, an air inlet is opened on the bottom surface of the protective shell 1, and the bottom end of the corrugated sleeve 43 is connected to the connecting rod through the mounting plate 422. When the first piston 42 is pushed downward by the drive ring 423, the sliding plate of the sliding rheostat 44 is also driven downward by the drive ring 423, thereby reducing the resistance of the sliding rheostat 44 in the circuit. Since the voltage is constant, the smaller the resistance of the sliding rheostat 44 in the circuit, the higher the output power of the motor 54. The faster the airflow driven by the motor 54 to the fan 53 into the protective housing 1, the better the heat dissipation effect on the cooling cylinder 51, the heat dissipation annular cylinder 31, and the corrugated sleeve 43. When the external temperature decreases, the expansion oil inside the corrugated sleeve 43 contracts. The bottom end of the corrugated sleeve 43 drives the first piston 42 to move upward through the mounting plate 422 and the connecting rod 421. The sliding plate is also driven upward by the drive ring 423 to increase the resistance of the sliding rheostat 44 in the circuit. Since the voltage is constant, the greater the resistance of the sliding rheostat 44 in the circuit, the smaller the output power of the motor 54, until the motor 54 stops working. At the same time, the coolant inside the heat dissipation annular cylinder 31 is drawn back into the heat insulation cylinder 41 through the first guide pipe 32. A negative pressure is generated inside the heat dissipation annular cylinder 31. The negative pressure causes the second ball valve 36 to disengage from the abutment ring and compress the second spring 37. The coolant inside the cooling cylinder 51 flows back into the heat dissipation annular cylinder 31 through one of the second guide pipes 33. The second piston 52 moves upward to facilitate the next operation.

[0039] Working principle: When this device is in use, the corrugated sleeve 43 installed at the top of the inner part of the protective shell 1 senses the change in the external temperature. When the external temperature rises, the expansion oil absorbs heat and expands, so that the coolant is transported to the inside of the heat dissipation annular cylinder 31 through the two first guide pipes 32. The outer wall of the heat dissipation annular cylinder 31 is coaxially sleeved on the outside of the pressure sensor body 21, which can surround the pressure sensor body 21 with the introduced coolant to achieve efficient heat exchange.

[0040] When the coolant is injected into the heat dissipation annular cylinder 31, the liquid pressure inside the heat dissipation annular cylinder 31 gradually increases. The high-temperature coolant originally stored inside the heat dissipation annular cylinder 31 is pushed open by the pressure, and at the same time the first spring 35 is compressed. The coolant flows into the cooling cylinder 51 through the second guide pipe 33. The second piston 52 is slidably installed inside the cooling cylinder 51. The second piston 52 moves downward under the push of the liquid, so that the hot liquid inside the cooling cylinder 51 can fully contact the cylinder wall for heat transfer. The cooling cylinder 51 is made of copper. The good thermal conductivity of copper can quickly transfer the heat inside the coolant to the outside of the cylinder.

[0041] The output power of the motor 54 is regulated by the sliding rheostat 44. When the corrugated sleeve 43 pushes the connecting rod 421 down due to the temperature rise, the resistance of the sliding rheostat 44 in the circuit decreases. Since the external voltage remains constant, the input current of the motor 54 increases and the output power increases. The fan 53 in the air-cooling assembly 5 starts to run. The fan blades of the fan 53 rotate at high speed under the drive of the motor 54, delivering cold air into the protective shell 1. The cold air flows through the cooling cylinder 51, the heat dissipation annular cylinder 31 and the surface of the corrugated sleeve 43, accelerating the heat exchange between the coolant and the external airflow, thereby improving the overall heat dissipation efficiency.

[0042] When the outside temperature drops, the expansion oil inside the bellows 43 contracts. The bellows 43, through the mounting plate 422 and connecting rod 421, drives the first piston 42 to return to its original position. The sliding plate of the sliding rheostat 44 is driven upward by the drive ring 423, increasing the resistance of the sliding rheostat 44. The output power of the motor 54 gradually decreases until it stops working. At the same time, the coolant inside the cooling annular cylinder 31 is drawn back into the insulation cylinder 41 through the first guide pipe 32, generating a negative pressure inside the cooling annular cylinder 31. This negative pressure causes the second ball valve 36 to disengage from the abutment ring, compressing the second spring 37. The coolant inside the cooling cylinder 51 is drawn back into the cooling annular cylinder 31 through the second guide pipe 33. Under the pressure balance, the second piston 52 moves upward to complete its reset, preparing for the next temperature change cycle. Thus, the operation of this device is completed.

[0043] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope of the technology disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A pressure sensor temperature drift calibration device comprising a protective housing (1), characterized in that: The protective shell (1) is internally fixedly installed with a sensor assembly (2), the sensor assembly (2) comprises a pressure sensor body (21), the outer wall of the pressure sensor body (21) is fixedly installed with a heat dissipation assembly (3), the top end of the heat dissipation assembly (3) is fixedly installed with a temperature sensing assembly (4), and the bottom end of the heat dissipation assembly (3) is fixedly installed with an air cooling assembly (5). The heat dissipation assembly (3) comprises a heat dissipation annular cylinder (31), the heat dissipation annular cylinder (31) is internally filled with cooling liquid, the heat dissipation annular cylinder (31) is coaxially fixedly sleeved on the pressure sensor body (21), and the outer wall of the heat dissipation annular cylinder (31) is fixedly installed with two upper pipes (311) and two lower pipes (312) at the top and bottom ends respectively. The ends, away from the heat dissipation annular cylinder (31), of the two upper pipes (311) are fixedly installed with a first flow guide pipe (32) respectively, and the ends, away from the heat dissipation annular cylinder (31), of the two lower pipes (312) are fixedly installed with a second flow guide pipe (33) respectively. The temperature sensing assembly (4) comprises a temperature insulation cylinder (41), two first connecting ports (411) are formed in the outer wall of the temperature insulation cylinder (41) near the bottom end, and the ends, away from the two upper pipes (311), of the two first flow guide pipes (32) are fixedly connected with the two first connecting ports (411) respectively.

2. A pressure sensor temperature drift calibration apparatus as claimed in claim 1, wherein: First and second ball valves (34) and (36) are slidably installed in the inner walls of the two lower pipes (312) respectively, a first spring (35) is fixedly installed on the outer wall of the first ball valve (34), and a second spring (37) is fixedly installed on the outer wall of the second ball valve (36).

3. A pressure sensor temperature drift calibration apparatus as claimed in claim 2, wherein: A first piston (42) is slidably installed in the temperature insulation cylinder (41), two connecting rods (421) are fixedly installed on the top surface of the first piston (42), and the ends, away from the first piston (42), of the two connecting rods (421) are fixedly installed with a mounting plate (422) after penetrating through the top surface of the temperature insulation cylinder (41).

4. A pressure sensor temperature drift calibration apparatus as claimed in claim 3, wherein: A corrugated sleeve (43) is coaxially fixedly installed on the top surface of the mounting plate (422), the corrugated sleeve (43) is internally filled with expansion oil, and the top surface of the corrugated sleeve (43) is fixedly installed on the inner top surface of the protective shell (1).

5. A pressure sensor temperature drift calibration apparatus as claimed in claim 4, wherein: A driving ring (423) is fixedly installed on the two connecting rods (421) together, a sliding rheostat (44) is fixedly installed on the top surface of the temperature insulation cylinder (41), and the sliding sheet of the sliding rheostat (44) is fixedly connected with the driving ring (423).

6. The pressure sensor temperature drift calibration apparatus of claim 1, wherein: The air cooling assembly (5) comprises a cooling cylinder (51), two second connecting ports (511) are formed in the outer wall of the cooling cylinder (51) near the top end, the ends, away from the two lower pipes (312), of the two second flow guide pipes (33) are fixedly connected with the two second connecting ports (511) respectively, and a second piston (52) is slidably connected with the inner wall of the cooling cylinder (51).

7. A pressure sensor temperature drift calibration apparatus as claimed in claim 5, wherein: The air cooling assembly (5) further comprises a fan (53), the fan (53) is fixedly installed on the bottom surface of the protective shell (1), the rotating shaft of the fan (53) is fixedly connected with the output shaft of a motor (54), and the motor (54) is electrically connected with the sliding rheostat (44).

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