Double differential pressure sensor with fixed pressure reference point

Abstract

The embodiment of the utility model discloses a double-differential-pressure sensor with a fixed pressure reference point. The double-differential-pressure sensor comprises two end clamping plates arranged in parallel and a middle clamping plate located between the two end clamping plates. Each end clamping plate is provided with a single-face opening, the middle clamping plate is provided with a through opening, and the single-face opening of each end clamping plate faces the through opening. Each of the two differential pressure sensor core bodies comprises a high-pressure pressure sensing end, a low-pressure pressure sensing end and an electrical connection end, the low-pressure pressure sensing ends of the two differential pressure sensor core bodies are oppositely mounted on the through hole, and the high-pressure pressure sensing ends are respectively mounted on the single-face opening of one end clamping plate; the lateral ends of the two end clamping plates and the lateral ends of the middle clamping plate are further provided with pressure guiding openings which are used for being communicated with a pressure guiding pipe to guide in fluid media. The two differential pressure sensor cores are fixed and matched through the clamping plate, multi-point pressure taking can be achieved only through one single body structure, and errors possibly generated by split multi-point pressure guiding measurement are avoided.

Description

Technical Field

[0001] The present application relates to the technical field of flow measurement equipment, and in particular to a dual differential pressure sensor with a fixed pressure reference point. Background Art

[0002] In the field of differential pressure sensors, traditional detection methods typically use pressure-sensing pipes to introduce the measured medium into the differential pressure sensor. Pressure-sensing surfaces are installed at two introduction points to measure the pressure at those points, thereby calculating the pressure difference between the two points. This method has been widely adopted in applications such as differential pressure flowmeters due to its simplicity and reliability. However, with the advancement of fluid measurement technology and increasing user demand, throttling differential pressure flowmeters require not only absolute pressure measurements before and after the throttling element, but also precise measurement of the differential pressure between the two points. In this case, continuing to use traditional multi-point pressure measurement methods will encounter obvious limitations.

[0003] Traditional differential pressure sensor designs primarily support connection to two pressure inlets. This necessitates the use of multiple differential pressure sensors when simultaneous pressure or differential pressure measurements are required at multiple locations. This approach not only complicates the system but can also lead to measurement errors during actual production and assembly due to the complexity of the equipment and piping, resulting in riser sections and uneven positioning of multiple sensors. This also increases measurement system costs. Therefore, simplifying the structure of multi-point pressure sampling systems and reducing manufacturing costs while ensuring accurate measurements has become a key development direction for differential pressure sensor technology. Utility Model Content

[0004] The main purpose of this application is to provide a dual differential pressure sensor with a fixed pressure reference point, aiming to solve the error problem existing in the multi-point pressure measurement method of the existing differential pressure sensor.

[0005] To achieve the above objectives, the present application proposes a dual differential pressure sensor with a fixed pressure reference point, the dual differential pressure sensor comprising:

[0006] Two end clamps arranged in parallel, and a middle clamp located between the two end clamps;

[0007] Each end splint is provided with a single-sided opening, the middle splint has a through-opening, and the single-sided opening of each end splint is arranged toward the through-opening;

[0008] Two differential pressure sensor cores, each differential pressure sensor core comprising a high-pressure sensing end, a low-pressure sensing end, and an electrical connection end, the low-pressure sensing ends of the two differential pressure sensor cores being mounted oppositely on the through-holes, and the high-pressure sensing ends of the two differential pressure sensor cores being mounted on a single-sided opening of an end clamping plate;

[0009] The two end clamping plates and the lateral ends of the middle clamping plate are also provided with pressure inlet ports for connecting to the pressure inlet pipes to introduce fluid media.

[0010] For example, in the dual differential pressure sensor provided in at least one embodiment of the present application, mounting holes are further provided at corresponding positions of the two end clamps and the middle clamp, so that the connecting rod passes through the two end clamps and the middle clamp to form a connection and fix them.

[0011] For example, in the dual differential pressure sensor provided in at least one embodiment of the present application, the mounting holes are symmetrically arranged on both sides of the single-sided opening of each end clamping plate and on both sides of the through opening of the middle clamping plate.

[0012] For example, in the dual differential pressure sensor provided in at least one embodiment of the present application, a sealing member is further provided on the one-way opening of each end clamping plate and the through opening of the middle clamping plate.

[0013] For example, in the dual differential pressure sensor provided in at least one embodiment of the present application, a sealing surface is further provided between adjacent end clamping plates and the middle clamping plate.

[0014] For example, in the dual differential pressure sensor provided in at least one embodiment of the present application, the pressure inlet is respectively provided at both lateral ends of each end clamping plate or the middle clamping plate.

[0015] For example, in the dual differential pressure sensor provided in at least one embodiment of the present application, fixing holes are provided on the two end clamping plates and the lateral ends of the middle clamping plate for fixing the dual differential pressure sensor.

[0016] For example, in the dual differential pressure sensor provided in at least one embodiment of the present application, the differential pressure sensor core adopts a single crystal silicon piezoresistive sensor, a diffused silicon piezoresistive sensor, or a capacitive sensor.

[0017] Compared with the existing dual differential pressure sensors, the dual differential pressure sensor of the present application has at least the following beneficial effects: through the parallel arrangement of the end clamps and the middle clamps, the low-pressure sensing ends of the two dual differential pressure sensor cores are relatively installed on the middle clamp (through-hole), and the high-pressure sensing ends are installed on the end clamp (single-sided opening), and the fluid medium is introduced through the pressure inlets of the end clamps and the middle clamps. When taking pressure at multiple points, there is a common low-pressure reference end, and the low-pressure reference end can cooperate with the high-pressure measuring end to measure the differential pressure data through the core respectively. It can avoid setting multiple pressure taking points in the pressure-taking pipeline, and can also calculate the differential pressure by benchmarking the high-pressure measuring end through the common low-pressure reference end, avoiding measurement errors caused by improper location of multiple pressure taking points or equipment pipeline reasons. At the same time, the use of the dual differential pressure sensor of the present application can also simplify the mass flow meter equipment pipeline and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0019] Figure 1 This is a front view of an embodiment of a dual differential pressure sensor of the present application;

[0020] Figure 2 for Figure 1 A top view of an embodiment;

[0021] Figure 3 for Figure 1 A side view of an embodiment;

[0022] Figure 4 for Figure 1 A front cross-sectional view of an embodiment;

[0023] Figure numerals: 1. end clamp; 2. middle clamp; 3. differential pressure sensor core; 31. high-pressure sensing end; 32. low-pressure sensing end; 33. electrical connection end; 4. pressure inlet; 5. mounting hole; 6. seal; 7. sealing surface; 8. fixing hole.

[0024] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] Figure 1 、 Figure 2 and Figure 3 The front view, top view and side view of an embodiment of a dual differential pressure sensor with a fixed pressure reference point of the present application are shown. The dual differential pressure sensor includes two end clamps 1, a middle clamp 2 and two differential pressure sensor cores 3 installed between the clamps.

[0030] Specifically, two end plates 1 are arranged parallel to each other on the left and right sides, and a middle plate 2 is also arranged parallel to each other between the two end plates 1. The two end plates 1 have the same structure, and each has a single-sided opening, i.e., one side is recessed and the other side is blocked, forming a cavity with a certain volume. The middle plate 2 has a through-hole. Both the single-sided opening and the through-hole are used to mount the pressure-sensing end of the differential pressure sensor core 3. In particular, a seal 6, such as a sealing gasket, or a sealant can be provided on the single-sided opening of each end plate 1 and the through-hole of the middle plate 2 to form a sealed connection between the differential pressure sensor core 3 and the end plates 1 (the single-sided opening) and the middle plate 2 (the through-hole). Alternatively, a sealing surface 7, such as a cylindrical shell, can be provided between the two end plates 1 and the middle plate 2 to completely enclose this area and connect the single-sided opening and the through-hole to prevent leakage of the fluid medium. The single-sided openings of the two end plates 1 are arranged opposite each other, i.e., both are positioned toward the through-hole of the middle plate 2. The two differential pressure sensor cores 3 are respectively arranged on both sides of the middle clamping plate 2 and are respectively installed in conjunction with an end clamping plate 1; specifically, each differential pressure sensor core 3 includes a high-pressure sensing end 31, a low-pressure sensing end 32 and an electrical connection end 33, and the low-pressure sensing ends 32 of the two differential pressure sensor cores 3 are relatively installed on the through-hole of the middle clamping plate 2, and the high-pressure sensing ends 31 of the two differential pressure sensor cores 3 are respectively installed on the single-sided opening of an end clamping plate 1.

[0031] In addition, the lateral ends of the two end clamps 1 and the middle clamp 2 are also provided with pressure inlets 4 for connecting to the pressure inlet pipe to introduce the fluid medium. It should be noted that the process of introducing the fluid medium through the pressure inlet 4 and realizing pressure measurement with the help of the differential pressure sensor core 3 requires that the end clamps 1 and the middle clamp 2 can reserve some space after the differential pressure sensor core 3 is installed, so that the fluid medium can enter and contact the high-pressure sensing end 31 and the low-pressure sensing end 32 (see Figure 4 Therefore, neither the high-pressure sensing end 31 nor the low-pressure sensing end 32 has an interference fit with the end clamping plate 1 and the middle clamping plate 2. In reality, the two differential pressure sensor cores 3 are combined and fixed together through the single-sided opening and the through-hole, with a cavity left for the fluid medium to enter the single-sided opening and the through-hole to contact the pressure sensing end of the differential pressure sensor core 3 to measure pressure data, which is then exported to a computer device through the electrical connection end 33 to obtain differential pressure data or calculated data such as mass flow.

[0032] The dual differential pressure sensor in this embodiment is arranged in parallel with the end clamp 1 and the middle clamp 2, and the low-pressure sensing end 32 of the two differential pressure sensor cores 3 are oppositely installed on the middle clamp 2 (through port), and the high-pressure sensing end 31 is installed on the end clamp 1 (single-sided opening), and then the fluid medium is connected through the pressure inlet 4 of the end clamp 1 and the middle clamp 2. When taking pressure at multiple points, there is a common low-pressure reference end, and the low-pressure reference end can cooperate with the high-pressure measuring end to calculate the differential pressure data through the core body respectively, which can avoid setting multiple pressure taking points in the pressure-taking pipeline, and can also calculate the differential pressure by comparing the high-pressure measuring end with the common low-pressure reference end, avoiding errors caused by improper placement of multiple pressure taking points or complex equipment pipelines. At the same time, the dual differential pressure sensor of this application can also simplify the pipeline of mass flow meter equipment and reduce costs.

[0033] It should be noted that the differential pressure sensor core 3 in the embodiment of the present application should be understood as the content of the prior art. For example, the differential pressure sensor core 3 can be a typical piezoresistive pressure sensitive element. The present application will no longer introduce the detailed structure and working principle of this part of the feature.

[0034] In at least one embodiment of the present application, mounting holes 5 are further provided at corresponding positions of the two end clamps 1 and the middle clamp 2 of the dual differential pressure sensor, so that the connecting rod can pass through the two end clamps 1 and the middle clamp 2 to form a connection and fix. The end clamps 1 and the middle clamp 2 themselves have the function of connecting and fixing through the differential pressure sensor core 3, such as a snap-fit ​​connection or a threaded connection between the high (low) pressure sensing end and the single-sided opening (through-port). However, given that the structure formed by this connection method has limited pressure tolerance, this embodiment uses the mounting holes 5 as a function of strengthening the assembly and fixing structure. For example, a threaded rod can pass through the end clamp 1 on the left, the middle clamp 2, and the end clamp 1 on the right in sequence, and then be fastened at both ends by nuts, so that the various components of the dual differential pressure sensor are integrated, making it easier to use in more scenarios.

[0035] In the above embodiment, more specifically, the mounting holes 5 can also be symmetrically arranged on both sides of the single-sided opening of each end clamping plate 1 and on both sides of the through opening of the middle clamping plate 2, for example Figure 3 The form shown is used to connect and fix the end clamping plates 1 and the middle clamping plates 2 in multiple directions, thereby enhancing the structural strength of the dual differential pressure sensor.

[0036] In at least one embodiment of the present application, the pressure inlet 4 on the end clamping plate 1 and the middle clamping plate 2 in the dual differential pressure sensor can also be set at both ends of the clamping plate, so that the two ends of the clamping plate are connected, so that the dual differential pressure sensor has better adaptability, such as the optional direction of connecting the pressure pipe fitting, and the pressure inlet 4 at the other end is blocked when in use - for example, using a threaded member (see Figure 2 and Figure 3), or when blockage occurs, the pressure-introducing pipeline can be cleared by back-flushing high-pressure gas into the pressure-introducing port 4 at the other end.

[0037] Additionally, in the aforementioned embodiment, the side ends of the end clamping plates 1 and the middle clamping plates 2 in the dual differential pressure sensor are further provided with fixing holes 8, for example Figure 1 As shown, the fixing holes 8 are distributed above and below the pressure inlet 4 and can be set in the form of threaded holes, which are used to fix the dual differential pressure sensor after it is installed through the end clamping plate 1 and the middle clamping plate 2, such as fixing it to the pipe or container to be measured to ensure stability during measurement.

[0038] In the above embodiment, optionally, the differential pressure sensor core 3 adopts a single crystal silicon piezoresistive sensor, a diffused silicon piezoresistive sensor or a capacitive sensor.

[0039] The dual differential pressure sensor of the present application can realize the measurement of three-point dual differential pressure without the need for two independent sets of pressure sensors. Compared with the existing technology, only three pressure points need to be opened on the flow meter, and the measurement data at the low-pressure end can be kept consistent to reduce measurement errors; it is also simple and compact in structure, reducing the engineering implementation difficulty of the pressure holes and the complexity of the pipeline.

[0040] The above description is merely an optional embodiment of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made using the contents of the present application specification and drawings under the inventive concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A dual differential pressure sensor with a fixed pressure reference point, characterized in that: The dual differential pressure sensor comprises: Two end clamps arranged in parallel, and a middle clamp located between the two end clamps; Each end splint is provided with a single-sided opening, the middle splint has a through-opening, and the single-sided opening of each end splint is arranged toward the through-opening; Two differential pressure sensor cores, each differential pressure sensor core comprising a high-pressure sensing end, a low-pressure sensing end, and an electrical connection end, the low-pressure sensing ends of the two differential pressure sensor cores being mounted oppositely on the through-holes, and the high-pressure sensing ends of the two differential pressure sensor cores being mounted on a single-sided opening of an end clamping plate; The two end clamping plates and the lateral ends of the middle clamping plate are also provided with pressure inlet ports for connecting to the pressure inlet pipes to introduce fluid media.

2. The dual differential pressure sensor according to claim 1, characterized in that: Mounting holes are also provided at corresponding positions of the two end clamping plates and the middle clamping plate, so that the connecting rods pass through the two end clamping plates and the middle clamping plate respectively to form a connection and fix them.

3. The dual differential pressure sensor according to claim 2, characterized in that: The mounting holes are symmetrically arranged on both sides of the single-sided opening of each end clamping plate and on both sides of the through opening of the middle clamping plate.

4. The dual differential pressure sensor according to claim 1, characterized in that: A sealing element is also provided on the one-way opening of each end clamping plate and the through opening of the middle clamping plate.

5. The dual differential pressure sensor according to claim 1, characterized in that: Sealing surfaces are also provided between adjacent end clamping plates and the middle clamping plates.

6. The dual differential pressure sensor according to claim 1, characterized in that: The pressure inlet is respectively provided at both lateral ends of each end clamping plate and the middle clamping plate.

7. The dual differential pressure sensor according to claim 1, characterized in that: The two end clamping plates and the lateral ends of the middle clamping plate are also provided with fixing holes for fixing the dual differential pressure sensor.

8. The dual differential pressure sensor according to claim 1, wherein: The differential pressure sensor core adopts a single crystal silicon piezoresistive sensor, a diffused silicon piezoresistive sensor or a capacitive sensor.

Images