A calibration device for pressure sensors

Abstract

The application provides a pressure sensor calibration device, which comprises a pressure calibration table, a pressure standard table, an adapter, a sealing component and a fixing component; the pressure standard table is arranged on the pressure calibration table and is used for outputting a standard pressure value; the adapter is provided with a first through hole in the middle part, and the first end of the adapter is connected with the pressure calibration table; the sealing component is provided with a second through hole in the middle part, the first through hole is coaxial with the second through hole, and the sealing component is arranged between the second end of the adapter and the test end surface of the pressure sensor to be calibrated; the fixing component is sleeved on the outside of the second end of the adapter and is used for fixing the pressure sensor to be calibrated; the pressure calibration table is used for providing pressure for the pressure standard table and the pressure sensor to be calibrated; and the pressure sensor to be calibrated is calibrated according to the standard pressure value output by the pressure standard table. The application can solve the technical problems of low efficiency and poor safety of the existing pressure sensor calibration device.

Description

Technical Field

[0001] This invention relates to the field of instrumentation technology, and in particular to a calibration and verification device for a pressure sensor. Background Technology

[0002] Submersible water level gauges are permanently installed inside measuring pipes in hydraulic structures or rock and soil slopes to measure changes in water level within the pipe. They are also used for long-term monitoring of water level changes in reservoirs, rivers, and lakes. Submersible water level gauges are constructed entirely of stainless steel and are cylindrical in shape, with a cylindrical base for the measuring surface.

[0003] Currently, the calibration and verification of this type of water pressure sensor adopts the "full immersion" water pressure tank calibration method: the entire sensor is placed in the water environment of the water pressure tank, the sensor cable is passed out from the cable outlet of the water pressure tank, the tank is sealed, and water is injected into the tank to pressurize it, so as to provide a precise water pressure calibration and verification environment of 0 to 2 MPa for the water pressure sensor.

[0004] The traditional “fully immersed” water pressure tank calibration method has two drawbacks: 1. It requires disassembling and lifting the heavy water pressure tank lid, which is time-consuming, labor-intensive and dangerous; 2. It requires threading the sensor cable, which is difficult to operate for long cable sensors. After threading, the threading port and the tank lid need to be sealed, which is a complicated and time-consuming process. Summary of the Invention

[0005] This invention provides a calibration device for pressure sensors, which can solve the technical problems of low efficiency and poor safety of existing pressure sensor calibration devices.

[0006] To solve the above-mentioned technical problems, the present invention provides a calibration device for a pressure sensor, the device comprising a pressure calibration bench, a pressure standard gauge, an adapter, a sealing component, and a fixing component;

[0007] The pressure standard gauge is installed on the pressure calibration bench and is used to output standard pressure values;

[0008] The adapter component has a first through hole in the middle, and the first end of the adapter component is connected to the pressure calibration bench.

[0009] The sealing component has a second through hole in the middle, the first through hole and the second through hole are coaxial, and the sealing component is disposed between the second end of the adapter component and the test end face of the pressure sensor to be calibrated.

[0010] The fixing component is sleeved on the outside of the second end of the adapter component and is used to fix the pressure sensor to be calibrated.

[0011] The pressure calibration bench is used to provide pressure to the pressure standard gauge and the pressure sensor to be calibrated.

[0012] When the pressure calibration bench provides pressure to the pressure standard gauge and the pressure sensor to be calibrated, the pressure sensor to be calibrated is calibrated according to the standard pressure value output by the pressure standard gauge.

[0013] Preferably, the fixing component is a shell structure with one open side. The open side is threaded to the outer side of the second end of the adapter component. The side of the fixing component has a first opening, and the side of the fixing component opposite to the open side has a second opening that communicates with the first opening. The pressure sensor to be calibrated is disposed inside the fixing component through the first opening, and the lead wire of the pressure sensor to be calibrated is led out from the second opening. By rotating the fixing component, the measuring end face of the pressure sensor to be calibrated is sealed to the adapter component.

[0014] Preferably, the second opening is a U-shaped opening.

[0015] Preferably, the pressure calibration bench includes at least two calibration interfaces, a pressure transmission channel, and a pressurizing device. The first end of the pressure transmission channel is connected to the pressurizing device, and the second end of the pressure transmission channel is connected to the pressure standard gauge and the adapter component respectively through the two calibration interfaces.

[0016] Preferably, when the pressure sensor to be verified is a pneumatic pressure sensor, the pressurizing device is a pneumatic pressurizing device; when the pressure sensor to be verified is a water pressure sensor, the pressurizing device is a water pressure pressurizing device.

[0017] Preferably, the sealing component is a rubber ring.

[0018] Preferably, the rubber ring has an annular recess at one end facing the adapter, and the adapter has an annular protrusion at the second end that matches the annular recess.

[0019] Preferably, the adapter has two opposing planes in the middle.

[0020] By applying the technical solution of this invention, a partial seal is achieved on the test surface of the pressure sensor to be calibrated through the cooperation of the adapter, sealing, and fixing components. Pressure is applied only to the test surface of the pressure sensor to complete the calibration, thus improving calibration efficiency and operational safety. This invention avoids the traditional "full immersion" calibration of pressure sensors. The device is simple in structure, reliable, and safe, significantly reducing the difficulty of pressure sensor calibration and thereby greatly improving production efficiency. Attached Figure Description

[0021] The accompanying drawings, which form part of this specification, are provided to further illustrate embodiments of the invention and, together with the textual description, explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0022] Figure 1 A schematic diagram of the structure of a calibration device for a pressure sensor according to an embodiment of the present invention is shown;

[0023] Figure 2 It shows Figure 1 A schematic diagram of the fixed components of the calibration and verification device for a medium-pressure sensor;

[0024] Figure 3 It shows Figure 1 A schematic diagram of the adapter component of the calibration and verification device for a medium-pressure sensor;

[0025] Figure 4 It shows Figure 1 A schematic diagram of the sealing component of the calibration and verification device for a medium-pressure sensor;

[0026] Figure 5 It shows Figure 1 A schematic diagram of the connection and sealing components of the calibration device for a medium-pressure sensor.

[0027] The above figures include the following reference numerals:

[0028] 10. Pressure calibration bench; 11. Water pressure transmission channel; 12. Air pressure transmission channel; 20. Pressure standard gauge; 30. Adapter component; 31. First through hole; 32. Annular protrusion; 33. Flat surface; 40. Sealing component; 41. Second through hole; 42. Annular recess; 50. Fixing component; 51. First opening; 52. Second opening. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. 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 a part of the embodiments of the present invention, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. 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.

[0030] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0031] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0032] like Figure 1 As shown, the present invention provides a calibration device for a pressure sensor, the device comprising a pressure calibration bench 10, a pressure standard gauge 20, an adapter 30, a sealing component 40, and a fixing component 50;

[0033] The pressure standard gauge 20 is installed on the pressure calibration bench 10 and is used to output standard pressure values.

[0034] The adapter 30 has a first through hole 31 in the middle, and the first end of the adapter 30 is connected to the pressure calibration bench 10.

[0035] The sealing component 40 has a second through hole 41 in the middle, the first through hole 31 and the second through hole 41 are coaxial, and the sealing component 40 is disposed between the second end of the adapter component 30 and the test end face of the pressure sensor to be calibrated.

[0036] The fixing component 50 is sleeved on the outside of the second end of the adapter component 30 and is used to fix the pressure sensor to be calibrated.

[0037] The pressure calibration bench 10 is used to provide pressure to the pressure standard gauge 20 and the pressure sensor to be calibrated.

[0038] When the pressure calibration bench 10 provides pressure to the pressure standard gauge 20 and the pressure sensor to be calibrated, the pressure sensor to be calibrated is calibrated according to the standard pressure value output by the pressure standard gauge 20.

[0039] This invention achieves partial sealing of the test face of the pressure sensor to be calibrated through the cooperation of the adapter 30, sealing component 40, and fixing component 50. Calibration is completed by applying pressure only to the test face of the pressure sensor, improving calibration efficiency and operational safety. The device avoids the traditional "full immersion" calibration of pressure sensors. Its simple structure, reliability, and safety significantly reduce the difficulty of pressure sensor calibration, thereby greatly improving production efficiency.

[0040] According to one embodiment of the present invention, the fixing component 50 is a shell structure with one open side. The open side is threaded to the outer side of the second end of the adapter component 30. The side of the fixing component 50 is provided with a first opening 51. The side of the fixing component 50 opposite to the open side is provided with a second opening 52 that communicates with the first opening 51. The pressure sensor to be calibrated is disposed in the fixing component 50 through the first opening 51. The lead wire of the pressure sensor to be calibrated is led out from the second opening 52. By rotating the fixing component 50, the measuring end face of the pressure sensor to be calibrated is sealed to the adapter component 30.

[0041] With the above settings, the rotating fixing component 50 can compress the sealing component 40, thereby achieving a partial seal on the measuring end face of the pressure sensor to be calibrated, ensuring the sealing of the high-pressure water or high-pressure air channel, and allowing the high-pressure water or high-pressure air to be transmitted to the measuring end face of the pressure sensor to be calibrated.

[0042] According to one embodiment of the present invention, the second opening 52 is a U-shaped opening to facilitate the lead-out of the tail wire of the pressure sensor to be calibrated.

[0043] According to one embodiment of the present invention, the pressure calibration bench 10 includes at least two calibration interfaces, a pressure transmission channel and a pressurizing device. The first end of the pressure transmission channel is connected to the pressurizing device, and the second end of the pressure transmission channel is connected to the pressure standard gauge 20 and the adapter component 30 respectively through the two calibration interfaces.

[0044] According to one embodiment of the present invention, when the pressure sensor to be verified is a pneumatic pressure sensor, the pressurizing device is a pneumatic pressurizing device; when the pressure sensor to be verified is a water pressure sensor, the pressurizing device is a water pressure pressurizing device.

[0045] With the above settings, the device of the present invention can perform calibration and verification of both water pressure sensors and air pressure sensors.

[0046] According to one embodiment of the present invention, the sealing component 40 is a rubber ring.

[0047] According to one embodiment of the present invention, the rubber ring is provided with an annular recess 42 at one end facing the adapter 30, and the adapter 30 is provided with an annular protrusion 32 that matches the annular recess 42 at the second end, thereby improving the sealing effect of the rubber ring.

[0048] According to one embodiment of the present invention, the adapter 30 has two opposing planes 33 in the middle, so as to facilitate the use of a wrench to install the adapter 30 on the pressure calibration bench 10.

[0049] In this invention, the pressure calibration bench 10 can be made of stainless steel, which enables rapid and accurate pressurization. The pressure standard gauge 20 can be a digital pressure standard gauge, which provides high-precision pressure monitoring and display.

[0050] The working process of the device of the present invention is as follows:

[0051] Step 1: Select the corresponding pressurization medium path according to the type of pressure sensor to be calibrated: If it is a water pressure sensor, open the water pressure transmission channel 11 and close the air pressure transmission channel 12; if it is an air pressure sensor, close the water pressure transmission channel 11 and open the air pressure transmission channel 12.

[0052] Step 2: Install the adapter 30 on the corresponding calibration interface of the pressure calibration bench 10.

[0053] Step 3: Initially install the fixing component 50 on the adapter component 30 without screwing it in.

[0054] Step 4: Insert the pressure sensor to be calibrated into the fixed component 50 through the side opening (first opening 51). Insert the tail cable of the pressure sensor into the U-shaped second opening 52 at the tail of the fixed component 50. The operator holds the tail cable of the sensor with one hand and rotates the fixed component 50 clockwise with the other hand until the measuring end face of the sensor is pressed down by the fixed component 50 onto the upper end face of the adapter component 30. Use a wrench to tighten the fixed component 50 to ensure that the sealing ring between the upper end face of the adapter component 30 and the measuring end face of the sensor is effectively compressed and sealed.

[0055] Step 5: Open the valve of the corresponding pressurizing device. While pressurizing the pipeline, the operator observes the digital pressure standard gauge 20 to monitor the internal pressure of the pipeline in real time, so as to achieve accurate pressure setting at the sensor measurement end face for calibration.

[0056] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0057] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0058] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A calibration and verification device for a pressure sensor, characterized in that, The device includes a pressure calibration bench (10), a pressure standard gauge (20), a connecting component (30), a sealing component (40), and a fixing component (50); The pressure standard gauge (20) is installed on the pressure calibration bench and is used to output standard pressure values; The adapter (30) has a first through hole (31) in the middle, and the first end of the adapter (30) is connected to the pressure calibration bench; The sealing component (40) has a second through hole (41) in the middle, the first through hole (31) and the second through hole (41) are coaxial, and the sealing component (40) is disposed between the second end of the adapter component (30) and the test end face of the pressure sensor to be calibrated; The fixing component (50) is sleeved on the outside of the second end of the adapter component (30) for fixing the pressure sensor to be calibrated; The pressure calibration bench is used to provide pressure to the pressure standard gauge (20) and the pressure sensor to be calibrated; when the pressure calibration bench provides pressure to the pressure standard gauge (20) and the pressure sensor to be calibrated, the pressure sensor to be calibrated is calibrated according to the standard pressure value output by the pressure standard gauge (20); The fixing component (50) is a shell structure with one open side. The open side is threaded to the outer side of the second end of the adapter component (30). The side of the fixing component (50) is provided with a first opening (51). The side of the fixing component (50) opposite to the open side is provided with a second opening (52) that communicates with the first opening (51). The pressure sensor to be calibrated is placed inside the fixing component (50) through the first opening (51). The lead wire of the pressure sensor to be calibrated is led out from the second opening (52). By rotating the fixing component (50), the measuring end face of the pressure sensor to be calibrated is sealed with the adapter component (30). The second opening (52) is a U-shaped opening to facilitate the lead wire of the pressure sensor to be calibrated to be led out. Rotating the fixing component (50) can compress the sealing component (40), thereby achieving a partial seal of the measuring end face of the pressure sensor to be calibrated, ensuring the sealing of the high-pressure water or high-pressure air channel, and allowing the high-pressure water or high-pressure air to be transmitted to the measuring end face of the pressure sensor to be calibrated. The sealing component (40) is a rubber ring; one end of the rubber ring facing the adapter (30) is provided with an annular recess (42), and the second end of the adapter (30) is provided with an annular protrusion (32) that matches the annular recess (42); The test end face of the pressure sensor to be calibrated is partially sealed by the cooperation of the adapter (30), the sealing component (40) and the fixing component (50). Only pressure is applied to the test end face of the pressure sensor to complete the calibration. The working process of the device is as follows: Step 1: Select the corresponding pressurization medium path according to the type of pressure sensor to be verified: If it is a water pressure sensor, open the water pressure transmission channel (11) and close the air pressure transmission channel (12); if it is a gas pressure sensor, close the water pressure transmission channel (11) and open the air pressure transmission channel (12). Step 2: Install the adapter (30) on the corresponding calibration interface of the pressure calibration bench (10); Step 3: Initially install the fixing component (50) on the adapter component (30), without screwing it in; Step 4: Insert the pressure sensor to be calibrated into the first opening (51) of the fixing component (50); insert the tail cable of the pressure sensor to be calibrated into the U-shaped second opening (52) at the tail of the fixing component (50); the operator holds the tail cable of the sensor with one hand and rotates the fixing component 50 clockwise with the other hand until the measuring end face of the sensor is pressed down by the fixing component (50) to the upper end face of the adapter component (30), and tighten the fixing component (50) with a hook wrench to ensure that the sealing ring between the upper end face of the adapter component (30) and the measuring end face of the sensor is effectively compressed and sealed. Step 5: Open the valve of the corresponding pressurizing device. While pressurizing the pipeline, the operator observes the digital pressure standard gauge (20) to monitor the internal pressure of the pipeline in real time, so as to achieve accurate pressure setting for the sensor measurement end face calibration.

2. The apparatus according to claim 1, characterized in that, The pressure calibration bench includes at least two calibration interfaces, a pressure transmission channel and a pressurizing device. The first end of the pressure transmission channel is connected to the pressurizing device, and the second end of the pressure transmission channel is connected to the pressure standard gauge (20) and the adapter (30) respectively through the two calibration interfaces.

3. The apparatus according to claim 2, characterized in that, When the pressure sensor to be verified is a pneumatic pressure sensor, the pressurizing device is a pneumatic pressurizing device; when the pressure sensor to be verified is a water pressure sensor, the pressurizing device is a water pressure pressurizing device.

4. The apparatus according to claim 1, characterized in that, The adapter (30) has two opposing planes (33) in the middle.

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