CN211777752U - Venturi tube structure for solving accumulated water of differential pressure sensor - Google Patents
Venturi tube structure for solving accumulated water of differential pressure sensor Download PDFInfo
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- CN211777752U CN211777752U CN201921754952.7U CN201921754952U CN211777752U CN 211777752 U CN211777752 U CN 211777752U CN 201921754952 U CN201921754952 U CN 201921754952U CN 211777752 U CN211777752 U CN 211777752U
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Abstract
The utility model discloses a solve venturi structure of differential pressure sensor ponding, including venturi body, connection structure and differential pressure sensor, connection structure includes the connecting portion of supporting platform and connection supporting platform and venturi body, and differential pressure sensor sets up on supporting platform, and connecting portion are equipped with gets the pressure hole, gets the one end intercommunication venturi body in pressure hole, and the other end link up supporting platform and relative with differential pressure sensor's pressure measurement mouth, and the internal diameter of pressure measurement mouth is greater than the internal diameter of getting the pressure hole and being located supporting platform one end. The utility model discloses eliminated the ponding groove, made the comdenstion water flow down in the same direction as getting the pressure hole pore wall, reduced the comdenstion water at the adnexed risk of pressure differential sensor pressure measurement mouth, solved pressure differential sensor pressure measurement mouth ponding, frozen problem.
Description
Technical Field
The utility model relates to the technical field of engines, especially, relate to a solve venturi structure of differential pressure sensor ponding.
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.
SUMMERY OF THE UTILITY MODEL
To the above problem, the utility model provides a solve venturi structure of differential pressure sensor ponding has eliminated the ponding groove, makes the comdenstion water flow down in the same direction as getting the pressure hole pore wall, reduces the comdenstion water at the adnexed risk of differential pressure sensor pressure measurement mouth, has solved pressure sensor pressure measurement mouth ponding, frozen problem.
The utility model discloses take following technical scheme to realize above-mentioned 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 utility model has the advantages that:
the utility model discloses a venturi structure of solution differential pressure sensor ponding has eliminated the ponding groove, makes the comdenstion water flow down in the same direction as getting the pressure hole pore wall, reduces the comdenstion water at the adnexed risk of differential pressure sensor pressure measurement mouth, has solved pressure differential sensor pressure measurement mouth ponding, frozen problem.
Drawings
Fig. 1 is a schematic structural diagram of a venturi tube structure for solving water accumulation of a differential pressure sensor provided in embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a venturi structure for solving water accumulation of a differential pressure sensor provided in 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.
Example 1
Referring to fig. 1, an embodiment of the present invention provides a venturi tube structure for solving water accumulation of a differential pressure sensor, including a venturi tube body 1, a connection structure and a differential pressure sensor 2. The differential pressure sensor 2 is provided with a pressure measuring port 3. The connecting structure comprises a supporting platform 4 and a connecting part 5 for connecting the supporting platform 4 with the Venturi tube body 1, the differential pressure sensor 2 is arranged on the supporting platform 4, and the connecting part 5 is provided with a pressure taking hole 6. One end of the pressure taking hole 6 is communicated with the inside of the Venturi tube body 1, and the other end of the pressure taking hole is communicated with the supporting platform 4 and is opposite to the pressure measuring port 3 of the differential pressure sensor 2. The inner diameter of the pressure measuring port 3 is larger than that of the pressure taking hole 6 at one end of the supporting platform 4.
The utility model discloses a solve venturi structure of differential pressure sensor ponding when using, differential pressure sensor 2's probe stretches out from pressure measurement mouth 3, and then stretches into venturi body 1 from getting pressure hole 6 in to survey the pressure differential in the venturi body 1. The inner diameter of the pressure measuring port 3 is slightly larger than that of the pressure taking hole 6 at one end of the supporting platform 4. Due to the design, the water accumulation groove formed between the pressure measuring port 3 and the top surface of the supporting platform 4 because the caliber of the pressure measuring port 3 is far larger than the drift diameter of the pressure measuring hole 6 is effectively reduced, so that the phenomena of water accumulation and icing at the pressure measuring port 3 of the differential pressure sensor 2 are prevented.
Further, the difference value of the inner diameters of the pressure measuring port 3 and the pressure taking hole 6 is less than 3 mm. In the actual use process, the inner wall of the pressure measuring port 3 is also provided with a sealing ring 11 to prevent the air leakage of the Venturi tube body 1. The sealing ring 11 occupies a certain space so that the water accumulation groove formed between the pressure measuring port 3 and the top surface of the supporting platform 4 is smaller. And the engine can shake in the use for ponding in ponding groove can be shaken down and get pressure hole 6 this moment, consequently can ignore.
Further, the venturi tube body 1 includes an inlet straight section 7, a contraction section 8, a cylindrical throat 9 and a diffusion section 10 which are sequentially arranged and connected. The two pressure taking holes 6 are respectively communicated with the inlet straight section 7 and the cylinder throat 9, so that the volume flow of the waste gas is calculated by measuring the pressure difference generated at the two positions of the inlet straight section 7 and the cylinder throat 9, meanwhile, the mass flow of the waste gas is converted according to the temperature and the pressure of the waste gas, and the larger the flow is, the larger the pressure difference is.
Further, the inner wall of the pressure taking hole 6 at one end of the support platform 4 is set to be a circular cylindrical surface. The circular cylindrical surface is set as a cylindrical surface. The design of the circular cylindrical surface is to adapt to the design of the pressure measuring port 3, and the cross sections of the two are circular, so that the two can be butted in a more fit manner.
Further, in this embodiment, the cross-sectional area at the top end of the pressure taking hole 6 is larger than the cross-sectional area at the bottom end of the pressure taking hole 6, so that the problem of blockage caused by accumulated water accumulated at the top end of the pressure taking hole 6 is avoided.
Example 2
Referring to fig. 2, in the present embodiment, the inner wall of the pressure tapping hole 6 at one end of the supporting platform 4 has a different shape, which is the same as that of embodiment 1.
In the present embodiment, the inner wall of the pressure tapping hole 6 at one end of the support platform 4 is set to be a tapered cylindrical surface. The conical cylindrical surface is set as a cylindrical surface. The setting of toper cylinder does benefit to ponding and flows down along the inner wall of slope.
Example 3
In this embodiment, the shape of the circular cylindrical surface is the same as that of embodiment 1 except that the shape is different.
In the present embodiment, the circular cylindrical surface is provided as a curved surface. The curved surface has certain radian, can prevent ponding adhesion at the inner wall of getting pressure hole 6.
Example 4
In this embodiment, the shape of the tapered cylindrical surface is the same as that of embodiment 2 except that the shape is different.
In the present embodiment, the tapered cylindrical surface is provided as a curved surface. The curved surface has certain radian, can prevent ponding adhesion at the inner wall of getting pressure hole 6.
Although the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that modifications and improvements can be made thereto. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (5)
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 of solving differential pressure sensor ponding of claim 1, characterized in that, the inner wall that the pressure hole is located the one end of supporting platform is established to circular cylinder, circular cylinder is established to cylinder or curved surface.
5. The venturi tube structure of solving differential pressure sensor ponding of claim 1, characterized in that, the inner wall that the pressure hole is located the one end of supporting platform is established to the toper cylinder, the toper cylinder is established to cylinder or curved surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921754952.7U CN211777752U (en) | 2019-10-18 | 2019-10-18 | Venturi tube structure for solving accumulated water of differential pressure sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921754952.7U CN211777752U (en) | 2019-10-18 | 2019-10-18 | Venturi tube structure for solving accumulated water of differential pressure sensor |
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| CN211777752U true CN211777752U (en) | 2020-10-27 |
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| CN201921754952.7U Active CN211777752U (en) | 2019-10-18 | 2019-10-18 | Venturi tube structure for solving accumulated water of differential pressure sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110725760A (en) * | 2019-10-18 | 2020-01-24 | 广西玉柴机器股份有限公司 | Venturi tube structure for solving accumulated water of differential pressure sensor |
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2019
- 2019-10-18 CN CN201921754952.7U patent/CN211777752U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110725760A (en) * | 2019-10-18 | 2020-01-24 | 广西玉柴机器股份有限公司 | Venturi tube structure for solving accumulated water of differential pressure sensor |
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