Opposite-side pressure direction differential pressure sensor

Abstract

The utility model relates to the technical field of pressure sensors, and discloses an opposite-side pressure direction differential pressure sensor, which comprises an upper joint and a lower joint, the upper joint and the lower joint are linearly arranged, a differential pressure core body is arranged between the upper joint and the lower joint, an upper cavity is formed between the upper part of the differential pressure core body and the upper joint, and a lower cavity is formed between the lower part of the differential pressure core body and the lower joint. A lower cavity is formed between the lower portion of the differential pressure core and the lower connector, an upper oil groove is formed in the upper end of the differential pressure core, an upper film is arranged at the upper end of the upper oil groove, a lower oil groove is formed in the lower end of the differential pressure core, a lower film is arranged at the lower end of the lower oil groove, the upper cavity and the upper oil groove are separated through the upper film, and the lower cavity and the lower oil groove are separated through the lower film. A connecting channel is arranged on the differential pressure core body and communicated with the upper oil groove and the lower oil groove, a differential pressure chip is arranged on the channel, the upper receiving face and the lower receiving face of the differential pressure chip are communicated with the upper oil groove and the lower oil groove respectively, the upper cavity is communicated with the upper connector, and the lower cavity is communicated with the lower connector. According to the utility model, differential pressure measurement on the same or different media in two opposite side pressure directions is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure sensors, in particular to a contralateral pressure direction differential pressure sensor. Background Art

[0002] There are two measurement methods for differential pressure sensors on the market. One is to measure the pressure of two measured media respectively through two different pressure sensors, and then calculate the pressure difference between the two. The other is to contact the two measured media through a pressure differential pressure chip, and fill the two sides of the differential pressure chip with oil to isolate the medium to achieve differential pressure measurement.

[0003] However, the first method uses two pressure sensors to measure, which will accumulate measurement errors and make the overall measuring instrument bulky. The second method uses a differential pressure chip to contact two media, which can only achieve the media whose measured channels are distributed at both ends of the differential pressure chip, and the differential pressure chip is exposed to the environment and is easily affected by installation or external stress. Utility Model Content

[0004] The utility model aims to solve the above problems and provides a pressure differential sensor in opposite pressure directions to achieve pressure differential measurement of the same or different media in two opposite pressure directions.

[0005] The technical solution adopted by the utility model is:

[0006] A pressure differential sensor for opposite pressure direction, characterized in that it includes an upper joint and a lower joint, the upper joint and the upper joint are arranged in a straight line, a differential pressure core is arranged between the upper joint and the lower joint, an upper cavity is formed between the upper part of the differential pressure core and the upper joint, and a lower cavity is formed between the lower part of the differential pressure core and the lower joint, an upper oil groove is opened at the upper end of the differential pressure core, an upper film is arranged at the upper end of the upper oil groove, a lower oil groove is opened at the lower end of the differential pressure core, a lower film is arranged at the lower end of the lower oil groove, the upper film separates the upper cavity from the upper oil groove, and the lower film separates the lower cavity from the lower oil groove, a connecting channel is arranged on the differential pressure core, the connecting channel connects the upper oil groove and the lower oil groove, a differential pressure chip is arranged on the channel, upper and lower receiving surfaces of the differential pressure chip are communicated with the upper oil groove and the lower oil groove respectively, the upper cavity is communicated with the upper joint, and the lower cavity is communicated with the lower joint.

[0007] The differential pressure chip is arranged in the upper oil groove, the upper receiving surface of the differential pressure chip is located in the upper oil groove, and the lower receiving surface of the differential pressure chip is connected to the upper end of the channel.

[0008] Furthermore, a shell is formed between the upper joint and the lower joint, the differential pressure core is arranged in the shell, an annular cavity is formed between the differential pressure core and the shell, a wiring hole is formed on the side of the shell, the wiring hole is connected to the annular cavity, and the wiring post of the differential pressure chip is led out from the wiring hole.

[0009] Furthermore, an upper oil injection channel and a lower oil injection channel are respectively arranged in the differential pressure core, the upper oil injection channel is connected to the upper oil tank, and the lower oil injection channel is connected to the lower oil tank.

[0010] Furthermore, the upper joint and the differential pressure core are connected by step fitting and sealed after welding.

[0011] Furthermore, the lower joint and the differential pressure core are connected by step fitting and sealed after welding.

[0012] Furthermore, the shell is tubular, and its two ends are respectively matched with the upper joint and the lower joint, and are sealed after welding.

[0013] The beneficial effects of the utility model are:

[0014] (1) The upper joint and the lower joint are arranged in a straight line, receiving two media in opposite pressure directions respectively;

[0015] (2) The differential pressure core is installed in the housing and is not affected by the environment and other equipment;

[0016] (3) The joint is sealed by step fitting and welding;

[0017] (4) Using a single differential pressure chip to measure differential pressure has higher sensitivity, simpler circuit design and lower cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Attached Figure 1 It is a schematic diagram of the internal sectional structure of the utility model.

[0019] The reference numerals in the accompanying drawings are:

[0020] 1. Upper joint; 2. Lower joint;

[0021] 3. Shell; 4. Differential pressure core;

[0022] 5. Upper cavity; 6. Lower cavity;

[0023] 7. Put on oil tank; 8. Put on film;

[0024] 9. Lower oil tank; 10. Lower film;

[0025] 11.Connection channel; 12.Wiring hole;

[0026] 13. differential pressure chip; 14. ring cavity;

[0027] 15. Terminal block; 16. Upper oil filling channel;

[0028] 17. Oil filling channel. DETAILED DESCRIPTION

[0029] The specific implementation of the opposite side pressure direction differential pressure sensor of the utility model is described in detail below with reference to the accompanying drawings.

[0030] See attached Figure 1 The contralateral pressure direction differential pressure sensor of the present patent includes an upper joint 1 and a lower joint 2, the lower joint 2 and the upper joint 1 are arranged in a straight line, and are respectively used to connect to the pipelines of the two media, and a housing 3 is formed between the upper joint 1 and the lower joint 2. The upper joint 1 and the lower joint 2 here are only used to distinguish the two joints, and do not limit their installation methods. When the two joints are connected to the pipeline, they can be connected horizontally, vertically, or the positions of the two joints can be reversed.

[0031] A differential pressure core 4 is arranged in the shell 3 between the upper joint 1 and the lower joint 2, an upper cavity 5 is formed between the upper part of the differential pressure core 4 and the upper joint 1, a lower cavity 6 is formed between the lower part of the differential pressure core 4 and the lower joint 2, an upper oil groove 7 is opened at the upper end of the differential pressure core 4, an upper film 8 is arranged at the upper end of the upper oil groove 7, a lower oil groove 9 is opened at the lower end of the differential pressure core 4, a lower film 10 is arranged at the lower end of the lower oil groove 9, the upper film 8 separates the upper cavity 5 from the upper oil groove 7, the lower film 10 separates the lower cavity 6 from the lower oil groove 9, a connecting channel 11 is arranged on the differential pressure core 4, the connecting channel 11 connects the upper oil groove 7 and the lower oil groove 9, the upper cavity 5 is connected with the upper joint 1, and the lower cavity 6 is connected with the lower joint 2.

[0032] A differential pressure chip 13 is arranged in the upper oil groove 7. The upper receiving surface of the differential pressure chip 13 is located in the upper oil groove 7. The lower receiving surface of the differential pressure chip 13 is connected to the upper end of the connecting channel 11 and isolates the upper and lower oil grooves.

[0033] When the differential pressure core 4 is installed in the housing 3, an annular cavity 14 is formed between the differential pressure core 4 and the housing 3. The terminal 15 of the differential pressure core extends into the annular cavity 14. A wiring hole 12 is formed on the side of the housing 3, the wiring hole 12 is connected to the annular cavity 14, and the wire is led out from the terminal 15 and then passes through the wiring hole 12.

[0034] The upper oil groove 7 and the lower oil groove 9 of the differential pressure core 4 are filled with oil respectively and then installed in the housing 3. During operation, the medium at both ends of the upper joint 1 and the lower joint 2 transmits pressure to the two receiving surfaces of the differential pressure chip 13 through the oil in the upper oil groove 7 and the lower oil groove 9 respectively, so as to measure the differential pressure. An upper oil filling channel 16 and a lower oil filling channel 17 are respectively arranged in the differential pressure core 4. The upper oil filling channel 16 is connected to the upper oil groove 7, and the lower oil filling channel 17 is connected to the lower oil groove 9. The upper oil filling channel 16 is used to fill the upper oil groove 7 with oil, and the lower oil filling channel 17 is used to fill the lower oil groove 9 with oil.

[0035] The upper joint 1 is connected to the differential pressure core 4 by step fitting, the lower joint 2 is connected to the differential pressure core 4 by step fitting, and the two ends of the tubular shell 3 are respectively matched with the upper joint 1 and the lower joint 2, and are sealed after circumferential laser welding. Step fitting and laser welding make the sealing performance between the two joints and the differential pressure chip 13 better, which is more conducive to improving the measurement accuracy.

[0036] The above are only preferred implementations of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A contralateral pressure direction differential pressure sensor, characterized in that: It includes an upper joint and a lower joint, the upper joint and the upper joint are arranged in a straight line, a differential pressure core is arranged between the upper joint and the lower joint, an upper cavity is formed between the upper part of the differential pressure core and the upper joint, and a lower cavity is formed between the lower part of the differential pressure core and the lower joint, an upper oil groove is opened at the upper end of the differential pressure core, an upper film is arranged at the upper end of the upper oil groove, a lower oil groove is opened at the lower end of the differential pressure core, a lower film is arranged at the lower end of the lower oil groove, the upper film separates the upper cavity from the upper oil groove, and the lower film separates the lower cavity from the lower oil groove, a connecting channel is arranged on the differential pressure core, the connecting channel connects the upper oil groove and the lower oil groove, a differential pressure chip is arranged on the channel, upper and lower receiving surfaces of the differential pressure chip are communicated with the upper oil groove and the lower oil groove respectively, and isolate the upper and lower oil grooves, the upper cavity is communicated with the upper joint, and the lower cavity is communicated with the lower joint.

2. The opposite side pressure direction differential pressure sensor according to claim 1, characterized in that: The differential pressure chip is arranged in the upper oil groove, the upper receiving surface of the differential pressure chip is located in the upper oil groove, and the lower receiving surface of the differential pressure chip is connected to the upper end of the channel.

3. The opposite side pressure direction differential pressure sensor according to claim 1, characterized in that: A shell is formed between the upper joint and the lower joint, the differential pressure core is arranged in the shell, an annular cavity is formed between the differential pressure core and the shell, a wiring hole is formed on the side of the shell, the wiring hole is connected to the annular cavity, and the wiring post of the differential pressure chip is led out from the wiring hole.

4. The opposite side pressure direction differential pressure sensor according to claim 1, characterized in that: An upper oil injection channel and a lower oil injection channel are respectively arranged in the differential pressure core. The upper oil injection channel is connected to the upper oil tank, and the lower oil injection channel is connected to the lower oil tank.

5. The opposite side pressure direction differential pressure sensor according to any one of claims 1 to 4, characterized in that: The upper joint and the differential pressure core are connected by step fitting and sealed after welding.

6. The opposite side pressure direction differential pressure sensor according to any one of claims 1 to 4, characterized in that: The lower joint and the differential pressure core are connected by step fitting and sealed after welding.

7. The opposite side pressure direction differential pressure sensor according to claim 3, characterized in that: The shell is tubular, and its two ends are respectively matched with the upper joint and the lower joint, and are sealed after welding.

Images