CN213148203U

CN213148203U - Gas circuit structure for batch calibration test tool of differential pressure sensors

Info

Publication number: CN213148203U
Application number: CN202022575861.6U
Authority: CN
Inventors: 陶逸宁
Original assignee: WUXI YOYONG SENSING Inc
Current assignee: WUXI YOYONG SENSING Inc
Priority date: 2020-11-09
Filing date: 2020-11-09
Publication date: 2021-05-07
Anticipated expiration: 2030-11-09

Abstract

The utility model discloses a gas circuit structure for a batch calibration test tool of differential pressure sensors, which relates to the technical field of pressure sensor test and comprises a gas pipe module and a Venturi tube module, wherein the gas pipe module comprises an air inlet hole and a plurality of air outlet holes used for being connected with the differential pressure sensors; the venturi tube module with the trachea module is connected, just the venturi tube module with the inside cavity of trachea module communicates each other. The MEFI differential pressure sensor module not only has simple structure and high installation reliability, but also can calibrate a plurality of MEFI differential pressure sensor modules at one time, can improve the productivity efficiency of sensor calibration test, reduce the calibration test cost and the rejection rate of assembly products, and can be compatible with various MEFI sensors.

Description

Gas circuit structure for batch calibration test tool of differential pressure sensors

Technical Field

The utility model belongs to the technical field of the pressure sensor test technique and specifically relates to a gas circuit structure that is used for differential pressure sensor to calibrate test fixture in batches.

Background

In order to improve the good low-temperature starting performance and fuel economy performance of the motorcycle and reduce emission pollution at the same time; at present, on high-end motorcycles, an electronic fuel injection mode is generally adopted to replace an oil-chemical engine, and electronic fuel injection (MEFI) is a mode that the engine on the motorcycle supplies fuel oil through an electronic fuel injection system, the optimal gasoline quantity can be calculated according to information which is synthesized and analyzed in an Electronic Control Unit (ECU), and then an instruction is sent to control the opening and closing of an electromagnetic valve of an oil injector, so that pressurized fuel oil is injected into an air passage through the oil injector.

A differential pressure sensor is a sensor used to measure the difference between two pressures. The sensor detects the operation condition of the motorcycle engine, converts the monitored pressure signal into an electric signal and transmits the electric signal to the ECU of the engine, the ECU calculates the air flow by analyzing the electric signal of the sensor, then fuel oil with certain pressure is applied, and the fuel oil is sprayed by the fuel injector to form atomization with the air. The MEFI system is matched with the differential pressure sensor to realize accurate control of oil injection and ignition.

The batch calibration test of the existing MEFI differential pressure sensor is generally limited to gas circuit reasons, the number of one-time performance calibration is small, and various defects of gas leakage, pressure loss, high material cost and the like can be caused frequently.

Therefore, a technique for solving the above problems is urgently needed.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to prior art's is not enough, provide a gas circuit structure for differential pressure sensor calibrates test fixture in batches, effect with higher speed through the gaseous continuous venturi of input, can make the gas that lets in the air inlet in being less than 1 second, lead to each place of anchor clamps, meanwhile, at every turn when gaseous from venturi comes out, can produce the effect of a cyclone backward flow, utilize this effect can be instantaneous airtight live the gas circuit of ventilating, with the decompression protection of carrying on of the characteristic of negative feedback. The yield efficiency of the sensor calibration test can be improved, the calibration test cost is reduced, the rejection rate of assembly products is reduced, and the MEFI sensor can be compatible with various types of MEFI sensors.

In order to realize the purpose of the utility model, the utility model provides a following technical scheme:

the air path structure for the batch calibration test tool of the differential pressure sensors comprises an air pipe module and a Venturi tube module, wherein the air pipe module comprises an air inlet hole and a plurality of air outlet holes used for being connected with the differential pressure sensors; the venturi tube module with the trachea module is connected, just the venturi tube module with the inside cavity of trachea module communicates each other.

Preferably, the air pipe module is a rectangular frame with a hollow cavity and comprises a first frame, a second frame, a third frame and a fourth frame which are connected end to end; the air outlets comprise a first air outlet, a second air outlet and a third air outlet which are arranged on the surface of the first frame, a fourth air outlet and a fifth air outlet which are arranged on the surface of the second frame, a sixth air outlet, a seventh air outlet and an eighth air outlet which are arranged on the surface of the third frame, and a ninth air outlet and a tenth air outlet which are arranged on the surface of the fourth frame; the air inlet is arranged on the side edge of the first frame and is connected with an external air source through a hose; the air inlet hole, the first air outlet hole, the second air outlet hole, the third air outlet hole, the fourth air outlet hole, the fifth air outlet hole, the sixth air outlet hole, the seventh air outlet hole, the eighth air outlet hole, the ninth air outlet hole and the tenth air outlet hole are respectively communicated with the hollow cavity of the air pipe module.

Preferably, the first frame, the second frame, the third frame and the fourth frame are integrally molded by casting.

Preferably, the venturi tube module 2 is composed of four venturi tube-shaped through pipes with inner cavity walls, and comprises a first through pipe, a second through pipe, a third through pipe and a fourth through pipe; the first through pipe and the second through pipe are parallel to each other, and two ends of the first through pipe and two ends of the second through pipe are connected with the first frame and the third frame respectively; the third pipe and the fourth pipe are parallel to each other, two ends of the third pipe and the fourth pipe are connected with the second frame and the fourth frame respectively, and hollow cavities in the first pipe, the second pipe, the third pipe, the fourth pipe, the first frame, the second frame, the third frame and the fourth frame are communicated with each other.

Preferably, the first through pipe, the second through pipe, the third through pipe and the fourth through pipe are connected in a groined shape and are integrally cast.

Preferably, an embedded hexagonal nut is arranged at the air outlet.

Advantageous effects

The utility model provides a gas circuit structure for differential pressure sensor calibrates test fixture in batches, the gas through the input is the venturi effect with higher speed constantly, can make the gas that lets in the air inlet in being less than 1 second the time, lead to each place of anchor clamps, meanwhile, at every turn when gas comes out from venturi, can produce the effect of a cyclone backward flow, utilize this effect can be instantaneous airtight live the gas circuit of ventilating to the decompression protection of carrying on of the characteristic of negative feedback. The MEFI differential pressure sensor module not only has simple structure and high installation reliability, but also can calibrate a plurality of MEFI differential pressure sensor modules at one time, can improve the productivity efficiency of sensor calibration test, reduce the calibration test cost and the rejection rate of assembly products, and can be compatible with various MEFI sensors.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a gas circuit structure for a batch calibration test fixture for differential pressure sensors according to the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

fig. 3 is a schematic structural diagram of an air pipe module of an air path structure for a batch calibration test fixture for differential pressure sensors according to the present invention;

fig. 4 is a schematic structural diagram of a venturi tube module of an air path structure for a batch calibration test fixture for differential pressure sensors according to the present invention;

fig. 5 is the utility model relates to an inside gas transmission schematic diagram of a gas circuit structure for differential pressure sensor calibrates test fixture in batches.

Graphic notation:

1-air pipe module, 1-1-first frame, 1-2-second frame, 1-3-third frame, 1-4-fourth frame, 2-Venturi pipe module, 2-1-first through pipe, 2-2-second through pipe, 2-3-third through pipe, 2-4-fourth through pipe, 3-air outlet, 3-1-first air outlet, 3-2-second air outlet, 3-3-third air outlet, 3-4-fourth air outlet, 3-5-fifth air outlet, 3-6-sixth air outlet, 3-7-seventh air outlet, 3-8-eighth air outlet, 3-9-ninth air outlet, 3-10-tenth air outlet hole, 4-air inlet hole and 5-embedded hexagon nut.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1, the air path structure for the batch calibration test tool of the differential pressure sensor comprises an air pipe module 1 and a venturi tube module 2, wherein the air pipe module 1 comprises an air inlet hole 4 and a plurality of air outlet holes 3 for connecting with the differential pressure sensor; venturi module 2 with trachea module 1 is connected, just venturi module 2 with the inside cavity of trachea module 1 communicates each other.

As an optimization of the structure, as shown in fig. 3, the air pipe module 1 is a rectangular frame with a hollow cavity, and includes a first frame 1-1, a second frame 1-2, a third frame 1-3 and a fourth frame 1-4 which are connected end to end; the air outlets 3 comprise a first air outlet 3-1, a second air outlet 3-2 and a third air outlet 3-3 which are arranged on the surface of the first frame 1-1, a fourth air outlet 3-4 and a fifth air outlet 3-5 which are arranged on the surface of the second frame 1-2, a sixth air outlet 3-6, a seventh air outlet 3-7 and an eighth air outlet 3-8 which are arranged on the surface of the third frame 1-3, and a ninth air outlet 3-9 and a tenth air outlet 3-10 which are arranged on the surface of the fourth frame 1-4; the air inlet hole 4 is arranged on the side edge of the first frame 1-1 and is connected with an external air source through a hose; the air inlet hole 4, the first air outlet hole 3-1, the second air outlet hole 3-2, the third air outlet hole 3-3, the fourth air outlet hole 3-4, the fifth air outlet hole 3-5, the sixth air outlet hole 3-6, the seventh air outlet hole 3-7, the eighth air outlet hole 3-8, the ninth air outlet hole 3-9 and the tenth air outlet hole 3-10 are respectively communicated with the hollow cavity of the air pipe module 1.

Specifically, the first frame 1-1, the second frame 1-2, the third frame 1-3 and the fourth frame 1-4 are integrally cast, and hollow cavities corresponding to each frame are communicated with each other.

As a further optimization of the present embodiment, as shown in fig. 4, the venturi tube module 2 is composed of four through pipes with inner cavity walls forming a venturi tube shape, and includes a first through pipe 2-1, a second through pipe 2-2, a third through pipe 2-3, and a fourth through pipe 2-4; the first through pipe 2-1 and the second through pipe 2-2 are parallel to each other, and two ends of the first through pipe and the second through pipe are respectively connected with the first frame 1-1 and the third frame 1-3; the third pipe 2-3 and the fourth pipe 2-4 are parallel to each other, two ends of the third pipe are respectively connected with the second frame 1-2 and the fourth frame 1-4, the first pipe 2-1, the second pipe 2-2, the third pipe 2-3 and the fourth pipe 2-4 are connected with each other in a groined shape, the first pipe, the second pipe, the third pipe and the fourth pipe are integrally cast and formed, and hollow cavities of the pipes are communicated with each other.

Specifically, the Venturi effect, named by the italian physicist Venturi (Giovanni Battista Venturi), is characterized by the phenomenon of an increase in the flow velocity of the fluid as it passes through a reduced flow section, which is inversely proportional to the flow section. On the air flue inner wall of groined type, densely and vertically arrange the miniature venturi of multistage, every section venturi end to end, through continuous venturi acceleration effect, can make the gas that lets in the air inlet in less than 1 second, lead to each place of anchor clamps.

As shown in fig. 5, in order to ensure that the cavities and the air inlet and outlet holes are communicated with each other, the hollow cavities inside the first through pipe 2-1, the second through pipe 2-2, the third through pipe 2-3, the fourth through pipe 2-4, the first frame 1-1, the second frame 1-2, the third frame 1-3 and the fourth frame 1-4 are communicated with each other. Specifically, an external air source enters through the air inlet hole 4 and is continuously accelerated through the wall of the Venturi tube, so that the air introduced into the air inlet can be introduced to each place of the clamp within less than 1 second; meanwhile, when the gas comes out of the Venturi tube every time, a cyclone backflow effect can be generated, and the ventilation gas circuit can be closed instantaneously by using the cyclone backflow effect, so that the decompression protection is performed by using the negative feedback characteristic.

As shown in figure 2, in order to facilitate the smooth connection of the air outlet hole 3 and external parts, such as a differential pressure sensor, an embedded hexagonal nut 5 is arranged at the air outlet hole 1, and only external screws are required to be screwed, so that the sealing performance is high.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a gas circuit structure that is used for differential pressure sensor to calibrate test fixture in batches which characterized in that: the air pipe type air conditioner comprises an air pipe module (1) and a Venturi tube module (2), wherein the air pipe module (1) comprises an air inlet hole (4) and a plurality of air outlet holes (3) used for being connected with a differential pressure sensor; venturi tube module (2) with trachea module (1) is connected, just venturi tube module (2) with the inside cavity of trachea module (1) communicates each other.

2. The air path structure for the batch calibration test tool of the differential pressure sensors according to claim 1, which is characterized in that: the air pipe module (1) is a rectangular frame with a hollow cavity and comprises a first frame (1-1), a second frame (1-2), a third frame (1-3) and a fourth frame (1-4) which are connected end to end; the air outlets (3) comprise a first air outlet (3-1), a second air outlet (3-2) and a third air outlet (3-3) which are arranged on the surface of the first frame (1-1), a fourth air outlet (3-4) and a fifth air outlet (3-5) which are arranged on the surface of the second frame (1-2), a sixth air outlet (3-6), a seventh air outlet (3-7) and an eighth air outlet (3-8) which are arranged on the surface of the third frame (1-3), and a ninth air outlet (3-9) and a tenth air outlet (3-10) which are arranged on the surface of the fourth frame (1-4); the air inlet hole (4) is arranged on the side edge of the first frame (1-1) and is connected with an external air source through a hose; the air inlet hole (4), the first air outlet hole (3-1), the second air outlet hole (3-2), the third air outlet hole (3-3), the fourth air outlet hole (3-4), the fifth air outlet hole (3-5), the sixth air outlet hole (3-6), the seventh air outlet hole (3-7), the eighth air outlet hole (3-8), the ninth air outlet hole (3-9) and the tenth air outlet hole (3-10) are respectively communicated with the hollow cavity of the air pipe module (1).

3. The air path structure for the batch calibration test tool of the differential pressure sensors according to claim 2, which is characterized in that: the first frame (1-1), the second frame (1-2), the third frame (1-3) and the fourth frame (1-4) are integrally cast and formed.

4. The air path structure for the batch calibration test tool of the differential pressure sensors according to claim 2, which is characterized in that: the Venturi tube module (2) is composed of four venturi-shaped through tubes with inner cavity walls, and comprises a first through tube (2-1), a second through tube (2-2), a third three-way tube (2-3) and a fourth through tube (2-4); the first through pipe (2-1) and the second through pipe (2-2) are parallel to each other, and two ends of the first through pipe and the second through pipe are respectively connected with the first frame (1-1) and the third frame (1-3); the third through pipe (2-3) and the fourth through pipe (2-4) are parallel to each other, two ends of the third through pipe are respectively connected with the second frame (1-2) and the fourth frame (1-4), and hollow cavities in the first through pipe (2-1), the second through pipe (2-2), the third through pipe (2-3), the fourth through pipe (2-4), the first frame (1-1), the second frame (1-2), the third frame (1-3) and the fourth frame (1-4) are communicated with each other.

5. The air path structure for the batch calibration test tool of the differential pressure sensors according to claim 4, which is characterized in that: the first through pipe (2-1), the second through pipe (2-2), the third through pipe (2-3) and the fourth through pipe (2-4) are connected in a groined shape and are integrally cast.

6. The air path structure for the batch calibration test tool of the differential pressure sensors according to claim 1, which is characterized in that: an embedded hexagonal nut (5) is arranged at the air outlet (3).