阅读说明：本技术 一种解决压差传感器积水的文丘里管结构 (Venturi tube structure for solving accumulated water of differential pressure sensor ) 是由 余超 杨仕明 王冲有 张�雄 覃星念 于 2019-10-18 设计创作，主要内容包括：本发明公开了一种解决压差传感器积水的文丘里管结构,包括文丘里管本体、连接结构和压差传感器,连接结构包括支撑平台和连接支撑平台与文丘里管本体的连接部,压差传感器设置在支撑平台上,连接部设有取压孔,取压孔的一端连通文丘里管本体,另一端贯通支撑平台并与压差传感器的测压口相对,测压口的内径大于取压孔位于支撑平台一端的内径。本发明消除了积水槽,使冷凝水顺取压孔孔壁流下,减小冷凝水在压差传感器测压口附着的风险,解决了压差传感器测压口积水、结冰的问题。(The invention discloses a Venturi tube structure for solving water accumulation of a differential pressure sensor, which comprises a Venturi tube body, a connecting structure and a differential pressure sensor, wherein the connecting structure comprises a supporting platform and a connecting part for connecting the supporting platform and the Venturi tube body, the differential pressure sensor is arranged on the supporting platform, the connecting part is provided with a pressure measuring hole, one end of the pressure measuring hole is communicated with the Venturi tube body, the other end of the pressure measuring hole penetrates through the supporting platform and is opposite to a pressure measuring port of the differential pressure sensor, and the inner diameter of the pressure measuring port is larger than that of the pressure measuring hole at one end. The invention eliminates the water accumulation groove, enables the condensed water to flow down along the hole wall of the pressure measuring hole, reduces the risk of the condensed water attaching to the pressure measuring port of the pressure difference sensor, and solves the problems of water accumulation and icing of the pressure measuring port of the pressure difference sensor.)

1. The utility model provides a solve venturi structure of differential pressure sensor ponding, a serial communication port, including venturi body, connection structure and differential pressure sensor, connection structure includes supporting platform and connection the connecting portion of supporting platform and venturi body, differential pressure sensor sets up on the supporting platform, connecting portion are equipped with and get the pressure hole, the one end intercommunication of getting the pressure hole venturi body, the other end link up supporting platform and with differential pressure sensor's pressure measurement mouth is relative, the internal diameter of pressure measurement mouth is greater than get the pressure hole and lie in the internal diameter of supporting platform one end.

2. The venturi structure of solving pressure differential sensor ponding of claim 1, wherein the difference in the inside diameters of the pressure tap and the pressure tap is less than 3 mm.

3. The venturi tube structure for solving the problem of the accumulated water of the differential pressure sensor as claimed in claim 1, wherein the venturi tube body comprises an inlet straight section, a contraction section, a cylinder throat and a diffusion section which are sequentially arranged and connected; the pressure measuring holes comprise two pressure measuring holes, and the two pressure measuring holes are respectively communicated with the inlet straight section and the cylinder throat part.

4. The venturi tube structure for solving water accumulation of differential pressure sensor as claimed in claim 1, wherein the inner wall of the pressure taking hole at one end of the support platform is a circular cylindrical surface.

5. The venturi tube structure for solving water accumulation of differential pressure sensor as claimed in claim 1, wherein the inner wall of the pressure taking hole at one end of the support platform is a tapered cylindrical surface.

6. The venturi tube structure for solving water accumulation of the differential pressure sensor as claimed in claim 4 or 5, wherein the circular cylindrical surface is a cylindrical surface or a curved surface; the conical cylindrical surface is a cylindrical surface or a curved surface.

Technical Field

The invention relates to the technical field of engines, in particular to a venturi tube structure for solving water accumulation of a differential pressure sensor.

Background

The EGR venturi tube consists of an inlet straight section, a contraction section, a cylinder throat, a diffusion section and a pressure taking port. The EGR venturi tube flowmeter is used for calculating the volume flow of the exhaust gas by measuring the pressure difference generated at the throat part and the straight section of an inlet when the exhaust gas flows through the venturi tube, and simultaneously converting the mass flow of the exhaust gas according to the temperature and the pressure of the exhaust gas, wherein the larger the flow is, the larger the pressure difference is.

In the prior art, chinese patent CN207212518U discloses a venturi tube device for EGR system, by venturi tube, a temperature sensor, a pressure sensor, differential pressure sensor constitutes, venturi tube's cooling water hole is arranged in the position of below between positive pressure taking hole and the negative pressure taking hole, a temperature sensor hole, a pressure sensor hole, positive pressure taking hole and negative pressure taking hole parallel cloth, a temperature sensor hole, a pressure sensor hole, the trompil direction of positive pressure taking hole and negative pressure taking hole up, a temperature sensor inserts in the temperature sensor hole with venturi tube fixed connection, a pressure sensor inserts in the pressure sensor hole with venturi tube fixed connection, differential pressure sensor arranges in the top in positive pressure taking hole and negative pressure taking hole with venturi tube fixed connection. Wherein, differential pressure sensor is connected with venturi through two pressure measurement ports and is got the pressure port, has a ponding groove at venturi and differential pressure sensor fitting surface, and vapor in the engine exhaust gas is difficult to discharge after this ponding groove condensation, influences the precision of measuring EGR system exhaust gas flow, and ponding freezes under low temperature environment, directly leads to differential pressure sensor can't measure the pressure differential, and the system reports the trouble.

Disclosure of Invention

Aiming at the problems, the invention provides the venturi tube structure for solving water accumulation of the differential pressure sensor, which eliminates a water accumulation groove, enables condensed water to flow down along the hole wall of the pressure taking hole, reduces the risk of adhesion of the condensed water at the pressure measuring port of the differential pressure sensor, and solves the problems of water accumulation and icing at the pressure measuring port of the differential pressure sensor.

The invention adopts the following technical scheme to realize the purpose:

the utility model provides a solve venturi structure of differential pressure sensor ponding, includes venturi body, connection structure and differential pressure sensor, connection structure includes supporting platform and connection the connecting portion of supporting platform and venturi body, differential pressure sensor sets up on the supporting platform, connecting portion are equipped with gets the pressure port, get the one end intercommunication in pressure port venturi body, the other end link up supporting platform and with differential pressure sensor's pressure measurement mouth is relative, the internal diameter of pressure measurement mouth is greater than get the pressure port and lie in the internal diameter of supporting platform one end.

Preferably, the difference between the inner diameters of the pressure measuring port and the pressure taking hole is less than 3 mm.

Preferably, the venturi tube body comprises an inlet straight section, a contraction section, a cylindrical throat part and a diffusion section which are sequentially arranged and connected; the pressure measuring holes comprise two pressure measuring holes, and the two pressure measuring holes are respectively communicated with the inlet straight section and the cylinder throat part.

Preferably, the inner wall of the pressure taking hole at one end of the support platform is a circular cylindrical surface.

Preferably, the inner wall of the pressure taking hole at one end of the supporting platform is a conical cylindrical surface.

Preferably, the circular cylindrical surface is a cylindrical surface or a curved surface; the conical cylindrical surface is a cylindrical surface or a curved surface.

The invention has the beneficial effects that:

the venturi tube structure for solving water accumulation of the differential pressure sensor eliminates the water accumulation groove, enables condensed water to flow down along the hole wall of the pressure taking hole, reduces the risk of the condensed water attaching to the pressure measuring port of the differential pressure sensor, and solves the problems of water accumulation and icing of the pressure measuring port of the differential pressure sensor.

Drawings

Fig. 1 is a schematic structural diagram of a venturi tube structure for solving water accumulation of a differential pressure sensor according to embodiment 1 of the present invention;

fig. 2 is a schematic structural diagram of a venturi tube structure for solving water accumulation of a differential pressure sensor according to embodiment 2 of the present invention.

In the figure, 1-a Venturi tube body, 2-a differential pressure sensor, 3-a pressure measuring port, 4-a supporting platform, 5-a connecting part, 6-a pressure taking hole, 7-an inlet straight section, 8-a contraction section, 9-a cylindrical throat part, 10-a diffusion section and 11-a sealing ring.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings 1-2 and the detailed description thereof.