Differential pressure sensor in vertical pressure direction

Abstract

The utility model relates to the technical field of pressure sensors, and discloses a vertical pressure direction differential pressure sensor, which comprises an upper joint and a side joint which are arranged at an angle of 90 degrees, a differential pressure core body is arranged between the upper joint and the side joint, an upper cavity is formed at the upper end of the differential pressure core body, a lower cavity is formed at the lower end of the differential pressure core body, an upper oil groove is formed at the upper end of the differential pressure core body, and a lower oil groove is formed at the lower end of the differential pressure core body. A lower oil groove is formed in the lower end of the differential pressure core body, 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, the lower cavity and the lower oil groove are separated through the lower film, a connecting channel is formed in the differential pressure core body and communicated with the upper oil groove and the lower oil groove, and a differential pressure sensor chip is arranged on the channel. The upper and lower contact surfaces of the sensitive diaphragm of the differential pressure sensor chip are respectively communicated with the upper and lower oil grooves, the upper cavity is communicated with the upper joint, the lower part of the lower cavity is sealed by the sealing cover, and the side edge is communicated with the side joint. According to the utility model, differential pressure measurement of the same or different media in two vertical pressure directions is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure sensors, in particular to a vertical 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 with a pressure core, and fill the two sides of the core 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 the core to contact two media, which can only achieve the media where the measured channels are distributed at both ends of the core, and the core 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 vertical pressure direction differential pressure sensor to achieve differential pressure measurement of the same or different media in two vertical pressure directions.

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

[0006] A vertical pressure direction differential pressure sensor, characterized in that it includes an upper joint and a side joint, the side joint and the upper joint are arranged at 90 degrees, a differential pressure core is arranged between the upper joint and the side 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 side 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, and 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, the 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, the lower part of the lower cavity is closed by a sealing cover, and the side is communicated with the side joint.

[0007] Furthermore, 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 side joint, the differential pressure core is arranged in the shell, an annular cavity is formed between the differential pressure core and the shell, and the wire joint of the core is led out from the annular cavity.

[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 side joint and the differential pressure core are connected by step fitting and sealed after welding.

[0012] Furthermore, the sealing cover is connected to the lower part of the lower cavity through a step fit and is sealed after welding.

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

[0014] (1) The upper joint and the side joint are arranged vertically, receiving two media in the vertical pressure direction 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 core 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 cross-sectional structure of the utility model;

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

[0020] 1. Upper joint; 2. Side 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. Connecting channel; 12. Sealing cover;

[0026] 13. Differential pressure chip; 14. Ring cavity;

[0027] 15. Wire connector; 16. Upper oil filling channel;

[0028] 17. Oil filling channel. DETAILED DESCRIPTION

[0029] The specific implementation of the vertical 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 vertical pressure direction differential pressure sensor of this patent includes an upper joint 1 and a side joint 2. The side joint 2 is arranged at 90 degrees with the upper joint 1 and is used to connect to pipelines of two media respectively. The upper joint 1 and the side joint 2 are extended and connected to form a shell 3.

[0031] A differential pressure core 4 is arranged in the shell 3 between the upper joint 1 and the side 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 side 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, the lower cavity 6 is closed by a sealing cover 12, and the side is connected with the side 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 , and the lower receiving surface of the differential pressure chip 13 is connected to the upper end of the connecting channel 11 . The lower receiving surface of the core 13 is located in the lower oil groove 9 .

[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 wire connector 15 of the core 13 is led out from the differential pressure core 4 to the annular cavity 14 .

[0034] The upper oil groove 7 and the lower oil groove 9 of the differential pressure chip 13 are filled with oil respectively and then installed in the housing 3. During operation, the media at both ends of the upper joint 1 and the side joint 2 transmit 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 side joint 2 is connected to the differential pressure core 4 by step fitting, and the sealing cover 12 is connected to the lower part of the lower cavity 6 by step fitting, and the sealing is achieved after circumferential laser welding. Step fitting and laser welding make the sealing performance between the two joints and the core 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 vertical pressure direction differential pressure sensor, characterized in that: It includes an upper joint and a side joint, the side joint and the upper joint are arranged at 90 degrees, a differential pressure core is arranged between the upper joint and the side 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 side 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, the 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, the lower part of the lower cavity is closed by a sealing cover, and the side is communicated with the side joint.

2. The vertical 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 vertical pressure direction differential pressure sensor according to claim 1, characterized in that: A shell is formed between the upper joint and the side joint, the differential pressure core is arranged in the shell, an annular cavity is formed between the differential pressure core and the shell, and the wire joint of the core is led out from the annular cavity.

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

7. The vertical pressure direction differential pressure sensor according to any one of claims 1 to 4, characterized in that: The sealing cover is connected to the lower part of the lower cavity through step matching and is sealed after welding.

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