Multi-parameter output differential pressure sensor

Abstract

The utility model discloses a differential pressure sensor with multi-parameter output. The differential pressure sensor comprises a differential pressure sensor body, an upper shell and a meter head connected with the upper shell, the differential pressure sensor body comprises a lower shell, a central diaphragm arranged at the middle part in the lower shell, and a positive pressure end clamping block and a negative pressure end clamping block which are fixed at the two sides of the central diaphragm; a positive pressure end is formed between the positive pressure end clamping block and the central diaphragm, and a negative pressure end is formed between the negative pressure end clamping block and the central diaphragm; the device further comprises a pressure guiding capillary tube and a strain type pressure sensor. The lower section of the pressure guiding capillary tube is fixed to the positive pressure end clamping block and communicated with the positive pressure end, the upper section of the pressure guiding capillary tube is arranged in the upper shell, and the strain type pressure sensor is arranged at an opening in the upper end of the pressure guiding capillary tube. The differential pressure sensor is convenient in production process, can be realized only through manual welding, is compact in structure, has the appearance size equal to that of the differential pressure sensor, and can directly replace the conventional differential pressure sensor which cannot measure static pressure.

Description

Technical Field

[0001] The utility model relates to a differential pressure sensor, in particular to a differential pressure sensor with multi-parameter output. Background Art

[0002] When a differential pressure sensor is used in actual working conditions, it will encounter very large positive pressure and negative pressure. However, the differential pressure sensor can only measure its differential pressure value and cannot measure the static pressure value. At present, sensors that can measure static pressure, differential pressure and temperature on the market are collectively called multi-parameter differential pressure sensors, which can measure the measured differential pressure value, the pressure value at the positive pressure end, and the medium temperature, and output corresponding electrical signals.

[0003] Defects and deficiencies of the prior art:

[0004] There are two forms for multi-parameter differential pressure sensors in the market to measure static pressure. One is to encapsulate a static pressure chip (such as a MEMS pressure-sensitive chip) inside the differential pressure sensor, and measure the positive pressure through the positive pressure end oil circuit design. At the same time, a differential pressure chip and a temperature chip are designed in the structure to measure differential pressure and temperature simultaneously. However, this structure is complex, costly, and not easy to repair. The other is to install a pressure sensor at the threaded part of the mounting clamp block of the standard differential pressure sensor or at the on-site pressure pipeline. This structure is a split structure, with a large volume and cannot be installed in a narrow space. Content of the Utility Model

[0005] Aiming at the above deficiencies in the prior art, the purpose of the present utility model is to provide a multi-parameter output differential pressure sensor with a simple and delicate structure, easy to repair, and low cost.

[0006] The technical solution of the present utility model is as follows:

[0007] A differential pressure sensor with multi-parameter output includes a differential pressure sensor body, an upper housing, and a meter head connected to the upper housing; the differential pressure sensor body includes a lower housing, a central diaphragm arranged in the middle of the lower housing, and a positive pressure end clamp block and a negative pressure end clamp block fixed on both sides of the central diaphragm; a positive pressure end is formed between the positive pressure end clamp block and the central diaphragm, and a negative pressure end is formed between the negative pressure end clamp block and the central diaphragm; it also includes a pressure guiding capillary and a strain type pressure sensor; the lower section of the pressure guiding capillary is fixed on the positive pressure end clamp block and communicated with the positive pressure end, the upper section of the pressure guiding capillary is arranged inside the upper housing, and the strain type pressure sensor is arranged at the upper end opening of the pressure guiding capillary.

[0008] By separately setting the strain pressure sensor, welding the pressure pipeline at the positive pressure end clamp block to introduce the positive pressure end pressure into the upper housing space, welding the strain pressure sensor at the tail end, and finally potting with potting glue for protection, this structure is simple. By only welding the strain pressure sensor on the differential pressure sensor mounting clamp block, the measurement of on-site pressure, differential pressure, and temperature can be achieved. The cost is much lower than that of the integrated multi-parameter differential pressure sensor, and the overall installation size of the differential pressure sensor remains unchanged after welding the pressure sensor. The structure is delicate and convenient for on-site use.

[0009] Preferably, the pressure guiding capillary is welded on the positive pressure end clamp block. It is also possible to weld the pressure guiding capillary on the negative pressure end clamp block. The fixed connection and sealing between the pressure guiding capillary and the clamp block are achieved through welding.

[0010] Furthermore, the upper housing is communicated with the differential pressure sensor body, a potting layer is arranged in the upper housing to seal the differential pressure sensor body, and the upper end opening of the pressure guiding capillary passes through the potting layer and is located in the upper housing.

[0011] Furthermore, it also includes a temperature chip for measuring temperature and a differential pressure chip for measuring the differential pressure between the positive pressure end and the negative pressure end; the temperature chip and the differential pressure chip are arranged between the center diaphragm and the potting layer, and differential pressure sensor plug wires connected to the meter head are arranged on the temperature chip and the differential pressure chip.

[0012] Furthermore, a pressure sensor plug wire connected to the meter head is arranged on the strain pressure sensor.

[0013] Preferably, a through hole through which the pressure guiding capillary passes is arranged on the positive pressure end clamp block. Through the setting of the through hole, the installation of the pressure guiding capillary is facilitated.

[0014] Preferably, O-ring seals are arranged between the positive pressure end clamp block, the negative pressure section clamp block and the differential pressure sensor body; both the positive pressure end clamp block and the negative pressure end clamp block are fixed on the differential pressure sensor body through fixing bolts.

[0015] Compared with the prior art, the utility model has the following technical effects:

[0016] 1. In the utility model, a pressure guiding capillary is introduced on the differential pressure sensor mounting clamp block, the positive pressure introduction pipeline is welded in a welding form, a strain pressure sensor is welded at the tail end of the pipeline, and it is designed in the cavity of the upper housing of the differential pressure sensor; the production process is convenient and can be achieved only through manual welding.

[0017] 2. The utility model has a compact structure, and the appearance size is the same as that of the differential pressure sensor appearance, which can directly solve the problem that the existing differential pressure sensor cannot measure static pressure. Description of the Drawings

[0018] Briefly describe the content expressed in each attached drawing of the specification and the marks in the drawings:

[0019] Figure 1 It is a schematic structural diagram of a differential pressure sensor in an embodiment;

[0020] Figure 2 is Figure 1 The rear view of the view;

[0021] Figure 3 is Figure 1 The top view of the view

[0022] In the figure: 1. Differential pressure sensor body; 2. Upper housing; 3. Lower housing; 4. Central diaphragm; 5. Positive pressure end clamp; 6. Negative pressure end clamp; 7. Positive pressure end; 8. Negative pressure end; 9. Pressure guiding capillary; 10. Strain type pressure sensor; 11. Glue filling layer; 12. Differential pressure sensor plug wire; 13. Pressure sensor plug wire; 14. Through hole; 15. O-ring seal; 16. Fixed bolt. Specific embodiments

[0023] The following gives a non-limiting embodiment in conjunction with the attached drawings to further elaborate on the present utility model. However, it should be understood that these descriptions are only exemplary and do not intend to limit the scope of the present utility model. In addition, in the following description, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concept of the present utility model. Embodiment

[0024] As Figure 1 、 2 shown in FIGS. 3, a differential pressure sensor with multi-parameter output includes a differential pressure sensor body 1, an upper housing 2 and a meter head connected to the upper housing 2; the differential pressure sensor body 1 includes a lower housing 3, a central diaphragm 4 arranged in the middle of the lower housing 3, and a positive pressure end clamp 5 and a negative pressure end clamp 6 fixed on both sides of the central diaphragm 4; a positive pressure end 7 is formed between the positive pressure end clamp 5 and the central diaphragm 4, and a negative pressure end 8 is formed between the negative pressure end clamp 6 and the central diaphragm 4; the upper housing 2 is communicated with the differential pressure sensor body 1, and a glue filling layer 11 is arranged in the upper housing 2 to seal the differential pressure sensor body 1, and the upper end opening of the pressure guiding capillary 9 passes through the glue filling layer 11 and is located in the upper housing 2. A temperature chip for measuring temperature and a differential pressure chip for measuring the differential pressure between the positive pressure end 7 and the negative pressure end 8 are also arranged in the differential pressure sensor body 1; the temperature chip and the differential pressure chip are arranged between the central diaphragm 4 and the glue filling layer 11, and a differential pressure sensor plug wire 12 connected to the meter head is arranged on the temperature chip and the differential pressure chip. A pressure sensor plug wire 13 connected to the meter head is arranged on the strain type pressure sensor 10. O-ring seals 15 are arranged between the positive pressure end clamp 5 and the negative pressure section clamp and the differential pressure sensor body 1; both the positive pressure end clamp 5 and the negative pressure end clamp 6 are fixed on the differential pressure sensor body 1 through fixed bolts 16.

[0025] The differential pressure sensor with multi-parameter output in this embodiment further includes a pressure guiding capillary 9 and a strain type pressure sensor 10; the lower section of the pressure guiding capillary 9 is fixed on the positive pressure end clamp block 5 and communicated with the positive pressure end 7, the upper section of the pressure guiding capillary 9 is arranged inside the upper housing 2, and the strain type pressure sensor 10 is arranged at the opening at the upper end of the pressure guiding capillary 9. The pressure guiding capillary 9 is welded on the positive pressure end clamp block 5. A through hole 14 through which the pressure guiding capillary 9 passes is arranged on the positive pressure end clamp block 5.

[0026] The integrated multi-parameter differential pressure sensor is mostly used in the differential pressure type flow measurement industry. The differential pressure sensor body 1 needs to be installed with a standard clamp block, and the clamp block can be installed with a standard three-valve group. Through the three-valve group pipeline, it is installed with the flow pipeline. Therefore, the differential pressure sensor mostly has a structure with an installation clamp block. In this embodiment, the pressure pipeline of the pressure guiding capillary 9 is welded at the installation clamp block, the pressure is introduced into the space of the upper housing 2 of the sensor, and a strain type pressure sensor 10 is welded at the tail end. Finally, potting glue is used for protection. This kind of structure is delicate and simple. Only by welding the pressure sensor on the differential pressure sensor installation clamp block through the pipeline, the measurement of the on-site pressure, differential pressure, and temperature difference that the differential pressure sensor body 1 can measure can be realized. The cost is much lower than that of the integrated multi-parameter differential pressure sensor, and the overall installation size of the differential pressure sensor is not changed after the strain type pressure sensor 10 is welded. The structure is delicate and convenient for on-site use.

[0027] In the description of the present invention, it should be understood that if terms such as "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present invention. In addition, if terms such as "first", "second", etc. are used, they are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0028] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, if the terms "installation", "connection", and "coupling" are used, they should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific circumstances.

Claims

1. A differential pressure sensor with multi-parameter output, comprising a differential pressure sensor body (1), an upper housing (2), and a meter head connected to the upper housing (2); the differential pressure sensor body (1) includes a lower housing (3), a central diaphragm (4) disposed in the middle of the lower housing (3), and a positive pressure end clamp block (5) and a negative pressure end clamp block (6) fixed on both sides of the central diaphragm (4); a positive pressure end (7) is formed between the positive pressure end clamp block (5) and the central diaphragm (4), and a negative pressure end (8) is formed between the negative pressure end clamp block (6) and the central diaphragm (4); characterized in that, It further includes a pressure guiding capillary (9) and a strain type pressure sensor (10); the lower section of the pressure guiding capillary (9) is fixed on the positive pressure end clamp block (5) and communicated with the positive pressure end (7), the upper section of the pressure guiding capillary (9) is arranged inside the upper shell (2), and the strain type pressure sensor (10) is arranged at the opening at the upper end of the pressure guiding capillary (9).

2. The differential pressure sensor with multi-parameter output according to claim 1, characterized in that, The pressure guiding capillary (9) is welded on the positive pressure end clamp block (5).

3. The differential pressure sensor with multi-parameter output according to claim 1, characterized in that, The upper shell (2) is communicated with the differential pressure sensor body (1), and a potting layer (11) is arranged inside the upper shell (2) to seal the differential pressure sensor body (1), and the opening at the upper end of the pressure guiding capillary (9) passes through the potting layer (11) and is located inside the upper shell (2).

4. The differential pressure sensor with multi-parameter output according to claim 3, characterized in that, It further includes a temperature chip for measuring temperature and a differential pressure chip for measuring the differential pressure between the positive pressure end (7) and the negative pressure end (8); the temperature chip and the differential pressure chip are arranged between the central diaphragm (4) and the potting layer (11), and a differential pressure sensor plug wire (12) connected to the meter head is arranged on the temperature chip and the differential pressure chip.

5. The differential pressure sensor with multi-parameter output according to claim 1, characterized in that, A pressure sensor plug wire (13) connected to the meter head is arranged on the strain type pressure sensor (10).

6. The differential pressure sensor with multi-parameter output according to claim 1, characterized in that, A through hole (14) through which the pressure guiding capillary (9) passes is arranged on the positive pressure end clamp block (5).

7. The differential pressure sensor with multi-parameter output according to claim 1, characterized in that, O-shaped sealing rings (15) are arranged between the positive pressure end clamp block (5), the negative pressure section clamp block and the differential pressure sensor body (1); both the positive pressure end clamp block (5) and the negative pressure end clamp block (6) are fixed on the differential pressure sensor body (1) through fixing bolts (16).

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