Differential pressure sensor in same-side pressure direction

Abstract

The utility model relates to the technical field of pressure sensors, and discloses a differential pressure sensor in the same-side pressure direction, which comprises two upper joints which are arranged in parallel, a shell is formed below the upper joints, a lower cavity is arranged at the lower part of the shell, the bottom of the lower cavity is sealed by a sealing cover, and a second upper joint is communicated with the lower cavity. A differential pressure core is arranged between the first upper connector and the lower cavity of the shell, an upper cavity is formed between the upper portion of the differential pressure core and the first upper connector, an upper oil groove is formed in the upper end of the differential pressure core, an upper thin 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, and a lower thin film is arranged at the lower end of the lower oil groove. A connecting channel is arranged on the differential pressure core 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, and the upper cavity is communicated with the upper connector. According to the utility model, differential pressure measurement is carried out on the same or different media in the same side pressure direction.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure sensors, in particular to a same-side 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 medium where the measured channels are distributed at both ends of the differential pressure chip, and the differential pressure chip is exposed in the medium, which is easily affected by installation or external stress. Utility Model Content

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

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

[0006] A differential pressure sensor for pressure direction on the same side, characterized in that it includes a first upper joint and a second upper joint, the first upper joint and the second upper joint are arranged in parallel, a shell is formed below, a lower cavity is arranged at the lower part of the shell, the bottom of the lower cavity is closed by a sealing cover, the second upper joint is connected to the lower cavity, a differential pressure core is arranged between the first upper joint and the lower cavity of the shell, an upper cavity is formed between the upper part of the differential pressure core and the first upper 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 respectively connected to the upper oil groove and the lower oil groove, and the upper cavity is connected to the upper 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, an annular cavity is formed between the differential pressure core and the shell, a wire lead-out hole is provided at the bottom of the shell, and the wire connector of the differential pressure chip is led out from the wire lead-out 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 first upper joint and the differential pressure core are connected via a step fit and are sealed after welding.

[0011] Furthermore, the second upper joint is connected to the lower cavity through a pipeline and is welded to the circumference of the lower cavity.

[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 two upper joints are arranged in parallel to receive two media from the same side for differential pressure testing;

[0015] (2) The differential pressure chip is installed in the differential pressure core 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 cross-sectional structure of the utility model;

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

[0020] 1. The first upper joint; 2. The second upper 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 injection channel; 18. Pipeline;

[0029] 19. Wire lead-out hole. DETAILED DESCRIPTION

[0030] The specific implementation of the same-side pressure direction differential pressure sensor of the utility model is described in detail below with reference to the accompanying drawings.

[0031] See attached Figure 1 The same-side pressure direction differential pressure sensor of this patent includes a first upper joint 1 and a second upper joint 2. The first upper joint 1 and the second upper joint 2 are arranged in parallel. A shell 3 is formed below the two joints. A lower cavity 6 is arranged at the lower part of the shell. The second upper joint 2 is connected to the lower cavity 6. The two joints are respectively used to connect to pipelines of two media.

[0032] A differential pressure core 4 is arranged in the shell 3 between the first upper joint 1 and the lower cavity of the shell, an upper cavity 5 is formed between the upper part of the differential pressure core 4 and the first upper joint 1, an upper oil groove 7 is provided at the upper end of the differential pressure core 4, an upper film 8 is provided at the upper end of the upper oil groove 7, a lower oil groove 9 is provided at the lower end of the differential pressure core 4, a lower film 10 is provided 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, and 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 to the first upper joint 1, and the lower cavity 6 is closed by a sealing cover 12. The second upper joint 2 is connected to the lower cavity 6 through a pipe 18, and the lower part of the pipe 18 is circumferentially welded to the lower cavity 6.

[0033] 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.

[0034] 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 .

[0035] A wire lead-out hole 19 is provided at the bottom of the housing 3 , and the wire connector 15 of the differential pressure chip 13 is led out from the wire lead-out hole 19 .

[0036] 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 medium at both ends of the first upper joint 1 and the second upper 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.

[0037] The first upper joint 1 is connected to the differential pressure core 4 by step fitting, and the sealing cover 12 is connected to the lower cavity 6 by step fitting, and sealing is achieved 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.

[0038] 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 same-side pressure direction differential pressure sensor, characterized in that: The invention comprises a first upper joint and a second upper joint, wherein the first upper joint and the second upper joint are arranged in parallel, and a shell is formed below. A lower cavity is arranged at the lower part of the shell, and the bottom of the lower cavity is closed by a sealing cover. The second upper joint is connected to the lower cavity, and a differential pressure core is arranged between the first upper joint and the lower cavity of the shell. An upper cavity is formed between the upper part of the differential pressure core and the first upper joint. An upper oil groove is arranged at the upper end of the differential pressure core, and an upper film is arranged at the upper end of the upper oil groove. A lower oil groove is arranged 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, and the connecting channel connects the upper oil groove and the lower oil groove. A differential pressure chip is arranged on the channel, and the upper and lower receiving surfaces of the differential pressure chip are respectively connected to the upper oil groove and the lower oil groove, and the upper cavity is connected to the upper joint.

2. The same-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 same-side pressure direction differential pressure sensor according to claim 1, characterized in that: An annular cavity is formed between the differential pressure core and the shell, a wire lead-out hole is arranged at the bottom of the shell, and the wire connector of the differential pressure chip is led out from the wire lead-out hole.

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

6. The same-side pressure direction differential pressure sensor according to any one of claims 1 to 4, characterized in that: The second upper joint is connected to the lower cavity through a pipeline and is welded to the circumference of the lower cavity.

7. The same-side 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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