Low-cost, wide-working-temperature-zone and high-efficiency DPF differential pressure sensor test calibration tool
By designing an external DPF differential pressure sensor testing and calibration fixture, the problem of wide-temperature-range calibration was solved, achieving efficient temperature control and low-cost sealing stability, while simplifying the fixture structure.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-28
- Publication Date
- 2026-03-20
AI Technical Summary
The calibration of DPF differential pressure sensors is difficult, mainly because the wide operating temperature range causes deformation of the sealing material, resulting in low temperature control efficiency and complex and costly tooling structures.
A test calibration fixture consisting of an upper pressure plate and a lower pad block was designed. The sensor is placed on the outside of the fixture, and the communication and airtightness are independent modules. A clamping device is used to provide a constant clamping force to counteract thermal expansion and contraction deformation, simplifying the structure and reducing costs.
It improves temperature control efficiency, shortens heating and cooling time, enhances sealing stability over a wide temperature range, and reduces tooling manufacturing costs.
Smart Images
Figure CN224019215U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to tooling technical field, concretely is low cost work temperature zone wide high efficiency's DPF differential pressure sensor test calibration tooling. BACKGROUND
[0002] DPF is the key part for capturing and reducing particulate matter emission in diesel engine, full name is diesel particulate filter (Diesel Particulate Filter), also be called diesel particulate filter, aims at reducing PM emission in tail gas. Its core component is differential pressure sensor installed on DPF, measures the pressure difference of tail gas through the air pipe connected to the two ends of DPF, provides decision basis for ECU to judge the collection state of particles.
[0003] Differential pressure sensor calibration test needs to apply specific pressure, temperature standard (usually several different pressure points, temperature points, cover the full range of sensor), adjusts or verifies the gain or bias of sensor under these specific temperature, pressure, ensures that the output value can accurately correspond in the whole range, to achieve the desired linearity or precision
[0004] Because DPF differential pressure sensor its working environment temperature zone is wide (-40 ℃ ~ 140 ℃), lead to the calibration of DPF differential pressure sensor's difficulty is extremely great. Its difficulty mainly comes from the following three aspects: (1) because the working environment temperature zone is wide, the deformation amount of sealing material due to thermal expansion and cold shrinkage is very large, the sealing failure leads to air leakage in pressure control process;(2) at present, the pressure sensor test calibration tooling is mostly cavity wrapped type, namely, the sensor is placed in the tooling cavity to control pressure, temperature, because the isolation of tooling cavity leads to slow temperature control efficiency;(3) in addition to stable temperature control, temperature control, sensor test calibration tooling needs to lead out the electric signal collected by sensor, further increases the complexity of tooling, leads to high tooling manufacturing cost. Therefore, it is needed to improve. UTILITY MODEL CONTENTS
[0005] The utility model discloses a low cost work temperature zone wide high efficiency's DPF differential pressure sensor test calibration tooling, solve the temperature control efficiency of prior art low, complex structure and the problem of high cost.
[0006] In order to achieve the above object, the utility model provides the following technical scheme: the DPF differential pressure sensor test calibration tool of low cost, wide working temperature zone and high efficiency, comprising upper pressing plate and lower cushion block, the inside joint of lower cushion block has differential pressure sensor, be provided with supply pressure mouth and communication interface on the differential pressure sensor, be provided with ventilation interface on the upper pressing plate, the inside joint of upper pressing plate has sealing rubber pad, sealing rubber pad and supply pressure mouth resist, the bottom of upper pressing plate top and lower cushion block jointly joint has the compactor, the left side of differential pressure sensor is fixed with the burning clamping, be installed on the burning clamping and have the pin, and the pin and communication interface resist.
[0007] Preferably, the inside of the upper pressing plate is provided with a clamping groove, and the sealing rubber pad is located in the clamping groove. Through the setting of the clamping groove, the sealing rubber pad is conveniently accommodated in the upper pressing plate.
[0008] Preferably, the inside of the lower cushion block is provided with a limiting groove, and the differential pressure sensor is located in the limiting groove. Through the setting of the limiting groove, the differential pressure sensor is conveniently accommodated in the lower cushion block.
[0009] Preferably, the sealing rubber pad is fixedly connected with a plug, the plug is located in the clamping groove, the plug is slidably connected with a clamping pin in the inside, the clamping pin is clamped with the upper pressing plate, and the inside of the plug is provided with a spring. The sealing rubber pad can be installed in the upper pressing plate by the plug and the clamping pin.
[0010] Preferably, one end of the spring is fixedly connected with the clamping pin, and the other end of the spring is fixedly connected with the inner surface of the plug. Through the setting of the spring, the elastic force can be applied to the clamping pin, so that the clamping pin always keeps clamped with the upper pressing plate.
[0011] Preferably, the plug is fixedly connected with a positioning square, and the positioning square is clamped with the upper pressing plate. Through the setting of the positioning square, the installation direction of the plug and the sealing rubber pad in the upper pressing plate is positioned.
[0012] The utility model has the advantages that:
[0013] 1, the utility model discloses the combination of setting upper pressing plate and lower cushion block, and the sealing rubber pad is installed at upper pressing plate, then the compactor can seal the supply pressure mouth of differential pressure sensor, and a burning clamping with pin is set, the pin of burning clamping is electrically connected with the communication interface of differential pressure sensor, so that communication and air seal become two independent modules, and the sensor can be directly exposed in the temperature control box after being assembled with the tool, which is different from the wrapping type assembly of the sensor in the existing similar tool, the utility model places the sensor outside the tool, and the temperature rising and falling time in the test calibration process is accelerated.
[0014] 2. This utility model can provide a constant clamping force through the clamping device, thereby offsetting the deformation of the sealing material caused by thermal expansion and contraction during the temperature rise and fall process, increasing the sealing stability in a large temperature range, and has a simple structure and low manufacturing cost. Attached Figure Description
[0015] Figure 1 This is a three-dimensional view of the overall structure of this utility model;
[0016] Figure 2 For the present utility model Figure 1 Exploded view of the structure;
[0017] Figure 3 For the present utility model Figure 1 A schematic diagram of the differential pressure sensor structure;
[0018] Figure 4 For the present utility model Figure 1 A schematic diagram of the lower pad block structure;
[0019] Figure 5 For the present utility model Figure 1 A schematic diagram of the upper pressure plate structure;
[0020] Figure 6 For the present utility model Figure 1 A schematic diagram of the burning clip structure;
[0021] Figure 7 For the present utility model Figure 1 A partial structural front sectional view;
[0022] Figure 8 For the present utility model Figure 7 Enlarged view of the structure at point A.
[0023] In the diagram: 1. Upper pressure plate; 11. Slot; 12. Vent port; 2. Lower pad; 21. Limiting groove; 3. Sealing gasket; 31. Insert block; 32. Positioning block; 33. Locking pin; 34. Spring; 4. Programming clip; 41. Pin; 5. Clamping device; 6. Differential pressure sensor; 61. Pressure supply port; 62. Communication interface. Detailed Implementation
[0024] 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.
[0025] Please see Figures 1-7The application discloses a DPF differential pressure sensor test and calibration tool with low cost, wide working temperature range and high efficiency, which comprises an upper pressing plate 1 and a lower cushion block 2, a differential pressure sensor 6 is clamped in the lower cushion block 2, a limiting groove 21 is formed in the lower cushion block 2, and the differential pressure sensor 6 is located in the limiting groove 21. The limiting groove 21 is arranged to facilitate the accommodation of the differential pressure sensor 6 in the lower cushion block 2, a pressure supply port 61 and a communication interface 62 are arranged on the differential pressure sensor 6, a ventilation interface 12 is arranged on the upper pressing plate 1, a sealing rubber pad 3 is clamped in the upper pressing plate 1, a clamping groove 11 is formed in the upper pressing plate 1, and the sealing rubber pad 3 is located in the clamping groove 11. The clamping groove 11 is arranged to facilitate the accommodation of the sealing rubber pad 3 in the upper pressing plate 1, the sealing rubber pad 3 is in abutment with the pressure supply port 61, a presser 5 is clamped on the top of the upper pressing plate 1 and the bottom of the lower cushion block 2, a burning clamp 4 is fixedly connected to the left side of the differential pressure sensor 6, a pin 41 is arranged on the burning clamp 4, and the pin 41 is in abutment with the communication interface 62.
[0026] Please refer to Figures 7-8 A plug block 31 is fixedly connected to the sealing rubber pad 3, the plug block 31 is located in the clamping groove 11, a clamping pin 33 is slidably connected to the inside of the plug block 31, the clamping pin 33 is clamped with the upper pressing plate 1, and a spring 34 is arranged in the inside of the plug block 31. The sealing rubber pad 3 can be installed in the upper pressing plate 1 by means of the plug block 31 and the clamping pin 33. One end of the spring 34 is fixedly connected with the clamping pin 33, and the other end of the spring 34 is fixedly connected to the inner surface of the plug block 31. The spring 34 is arranged to apply an elastic force to the clamping pin 33, so that the clamping pin 33 is always clamped with the upper pressing plate 1. A positioning square block 32 is fixedly connected to the plug block 31 and clamped with the upper pressing plate 1. The positioning square block 32 is arranged to position the plug block 31 and the sealing rubber pad 3 in the upper pressing plate 1.
[0027] The utility model discloses a specific implementation process as follows: the differential pressure sensor 6 is placed in the limiting groove 21 of lower cushion block 2, then the sealant 3 is placed in the clamping groove 11 of upper pressing plate 1, and the plug 31 and the positioning square block 32 on the sealant 3 are also clamped into the upper pressing plate 1, and the clamping pin 33 supported by the spring 34 is used for clamping and fixing, then, the upper pressing plate 1 and the lower cushion block 2 are respectively arranged at the upper and lower ends of the differential pressure sensor 6, and are locked through the presser 5, at this time, the sealant 3 seals the pressure supply port 61 of the differential pressure sensor 6, then the burning and recording clamp 4 is clamped on the differential pressure sensor 6, and the pin 41 on the burning and recording clamp 4 abuts the communication interface 62 at the other end of the differential pressure sensor 6, and the two are electrically connected, in this way, the communication and the air seal become two independent modules, and the differential pressure sensor 6 can be directly exposed in the temperature control box after being assembled with the tool, which is different from the wrapping type assembly of the sensor of the prior similar tool, the utility model places the sensor on the outside of the tool, accelerates the temperature rising and falling time in the testing and calibration process, simultaneously, the presser 5 can provide constant clamping force, so that the deformation of the sealing material caused by thermal expansion and cold shrinkage in the temperature rising and falling process is offset, and the sealing stability in the large temperature range is increased.
[0028] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.
Claims
1. A low-cost, wide-temperature-range, and high-efficiency DPF differential pressure sensor testing and calibration fixture, comprising an upper pressure plate (1) and a lower pad (2), characterized in that: A differential pressure sensor (6) is snapped into the interior of the lower pad (2). The differential pressure sensor (6) is provided with a pressure supply port (61) and a communication interface (62). A venting interface (12) is provided on the upper pressure plate (1). A sealing gasket (3) is snapped into the interior of the upper pressure plate (1). The sealing gasket (3) abuts against the pressure supply port (61). A clamping device (5) is snapped into the top of the upper pressure plate (1) and the bottom of the lower pad (2). A programming clip (4) is fixedly clamped on the left side of the differential pressure sensor (6). A pin (41) is installed on the programming clip (4), and the pin (41) abuts against the communication interface (62).
2. The low-cost, wide-temperature-range, and high-efficiency DPF differential pressure sensor testing and calibration fixture according to claim 1, characterized in that: The upper pressure plate (1) has a slot (11) inside, and the sealing gasket (3) is located in the slot (11).
3. The low-cost, wide-temperature-range, and high-efficiency DPF differential pressure sensor testing and calibration fixture according to claim 1, characterized in that: The lower pad (2) has a limiting groove (21) inside, and the differential pressure sensor (6) is located in the limiting groove (21).
4. The low-cost, wide-temperature-range, and high-efficiency DPF differential pressure sensor testing and calibration fixture according to claim 1, characterized in that: A plug (31) is fixedly connected to the sealing gasket (3). The plug (31) is located in the slot (11). A locking pin (33) is slidably connected inside the plug (31). The locking pin (33) is engaged with the upper pressure plate (1). A spring (34) is provided inside the plug (31).
5. The low-cost, wide-temperature-range, and high-efficiency DPF differential pressure sensor testing and calibration fixture according to claim 4, characterized in that: One end of the spring (34) is fixedly connected to the locking pin (33), and the other end of the spring (34) is fixedly connected to the inner surface of the insert (31).
6. The low-cost, wide-temperature-range, and high-efficiency DPF differential pressure sensor testing and calibration fixture according to claim 4, characterized in that: A positioning block (32) is fixedly connected to the insert (31), and the positioning block (32) is engaged with the upper pressure plate (1).