Built-in flow channel structure of flow meter

Abstract

The utility model relates to the technical field of flow meters, in particular to a flow meter built-in flow channel structure which comprises an air inlet flow channel, a laminar flow channel and an air outlet flow channel which are sequentially communicated in the air flow direction. At least two groups of through detection flow channels are arranged between the laminar flow channels, and the tail end of each detection flow channel is provided with a balance flow channel which is equal to the detection flow channel in air pressure. The balance flow is arranged at the tail end of the detection flow channel, the space equal to the pressure in the detection flow channel is increased, and the pressure sensor and the differential pressure sensor can be conveniently installed at the same time in an application scene. Moreover, based on the arrangement of the balance flow channel, the long-distance distribution of the pair of detection flow channels becomes possible, the detection of the pressure and the pressure difference between the long-distance positions is realized, and the guarantee is provided for the improvement of the detection precision.

Description

Technical Field

[0001] The utility model relates to the technical field of flow meters, in particular to a built-in flow channel structure of a flow meter. Background Art

[0002] The flow meter is based on the characteristic that the pressure difference will be generated during the flow of the fluid. The greater the flow rate, the greater the pressure difference. It is used to monitor the flow rate of the fluid. Therefore, the flow meter must have a flow channel structure for realizing the flow of the fluid, as well as a sensor component (generally including a pressure sensor and a differential pressure sensor). The detection end of the sensor component is placed in the flow channel structure to detect the pressure / differential pressure of the fluid. In the prior art, the design of the flow channel structure mainly adopts the following two methods:

[0003] First, the detection flow channels are remotely arranged, and the two detection flow channels are respectively used to cooperate with the installation of the pressure sensor. Through the detection data of the two pressure sensors, the pressure difference at the corresponding positions of the two detection flow channels can be obtained;

[0004] Second, the detection channels are set in close proximity to achieve the installation of a differential pressure sensor with two detection pins close to each other, so as to directly measure the pressure difference between the two detection channels. However, since the two detection channels are too close, the measurement accuracy cannot be guaranteed.

[0005] Therefore, based on the limitation of the flow channel structure in the prior art, which restricts the installation of the sensor component, the utility model develops a flow meter with a built-in flow channel structure to solve the problem in the prior art. Utility Model Content

[0006] The utility model aims to provide a flow meter with a built-in flow channel structure to solve the problem in the prior art that the installation of a sensor is limited due to the limitation of the flow channel structure in the flow meter.

[0007] The technical solution of the utility model is: a flow meter built-in flow channel structure, formed in the flow meter body and the laminar flow structure, including an inlet flow channel, a laminar flow channel and an outlet flow channel connected in sequence along the air flow direction;

[0008] There are at least two groups of interlinked detection flow channels between the laminar flow channels, and the end of each detection flow channel has a balance flow channel with the same air pressure as that of the detection flow channel.

[0009] Preferably, the inlet flow channel, the laminar flow channel and the outlet flow channel are constructed as symmetrical structures;

[0010] The air flow directions corresponding to the air inlet end of the inlet air channel and the air outlet end of the outlet air channel are parallel to the air flow direction in the laminar flow channel.

[0011] Preferably, there is a height difference between the center lines of the inlet flow channel and the outlet flow channel and any of the laminar flow channels, and an inlet buffer cavity is provided between the inlet flow channel and the laminar flow channel, and an outlet buffer cavity is provided between the outlet flow channel and the laminar flow channel.

[0012] Preferably, the air flow directions corresponding to the air inlet end of the inlet air channel and the air outlet end of the outlet air channel are perpendicular to the air flow direction in the laminar flow channel.

[0013] Preferably, the airflow direction of the detection flow channel is perpendicular to the airflow direction of the laminar flow channel, and a plurality of the detection flow channels are distributed in the airflow direction.

[0014] Preferably, two detection flow channels are provided, and two corresponding balancing flow channels are also provided.

[0015] Preferably, the balancing flow channel is flat, and its length direction is parallel to the airflow direction in the laminar flow channel; and a pair of the balancing flow channels have first ends that are close to each other, and second ends that are far away from each other.

[0016] Preferably, the distance between a pair of the first ends is smaller than the distance between a pair of the detection channel axes.

[0017] Compared with the prior art, the advantages of the utility model are:

[0018] (1) By setting a balanced flow at the end of the detection channel, the space with equal pressure as that in the detection channel is increased, which facilitates the simultaneous installation of the pressure sensor and the differential pressure sensor in the application scenario. In addition, based on the setting of the balanced flow channel, it is possible to distribute a pair of detection channels over long distances, realize the detection of pressure and differential pressure between long-distance positions, and provide a guarantee for improving the detection accuracy.

[0019] (2) The air inlet direction and the air outlet direction can be parallel to the air flow direction in the laminar flow channel or perpendicular to the air flow direction in the laminar flow channel, but the air inlet height is always different from the air flow height in the laminar flow channel. When the air flow reaches the front end of the laminar flow channel, it can be concentrated and buffered to ensure that the air flow can flow evenly into each laminar flow channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0021] Figure 1 It is a schematic diagram of a built-in flow channel structure of a flow meter described in Example 1 of the utility model;

[0022] Figure 2 This is a distribution diagram of a built-in flow channel structure of a flow meter described in Example 1 of the utility model in the flow meter;

[0023] Figure 3 This is a schematic diagram of a built-in flow channel structure of a flow meter described in Example 2 of the utility model.

[0024] Wherein: 1. intake flow channel, 11. intake buffer chamber;

[0025] 2. Laminar flow channel;

[0026] 3. outlet air flow channel, 31. outlet air buffer chamber;

[0027] 4. Detect flow channel;

[0028] 5. Balance flow channel, 51. first end, 52. second end;

[0029] 6. Flow meter body, 7. Laminar flow structure, 8. Pressure sensor, 9. Differential pressure sensor. DETAILED DESCRIPTION

[0030] The following is a further detailed description of the present invention in conjunction with specific embodiments:

[0031] To facilitate understanding, the application scenario of the present application is first explained. In the flow meter, there must be a flow channel structure for realizing fluid flow and a sensor component for detecting fluid pressure or pressure differential. The detection end of the sensor component must be placed in the flow channel structure. Therefore, the design of the flow channel structure must be adapted to the installation of the sensor component. In the prior art, due to the limitations of the flow channel structure, the sensor component can only install a pressure sensor or a pressure differential sensor alone, but cannot install a pressure sensor and a pressure differential sensor at the same time. The present application designs the flow channel structure to realize the simultaneous installation of the pressure sensor and the pressure differential sensor.

[0032] Example 1

[0033] like Figure 1 As shown, a flow meter has a built-in flow channel structure, which is formed in the flow meter body 6 and the laminar flow structure 7, and includes an inlet flow channel 1, a laminar flow channel 2 and an outlet flow channel 3 which are sequentially connected along the air flow direction; there are at least two groups of through detection flow channels 4 between the laminar flow channels 2, and the end of each detection flow channel 4 has a balancing flow channel 5 with the same air pressure as that at the detection flow channel 4.

[0034] The inlet channel 1, the laminar channel 2 and the outlet channel 3 are constructed as a symmetrical structure; the airflow direction corresponding to the inlet end of the inlet channel 1 and the outlet end of the outlet channel 3 is parallel to the airflow direction in the laminar channel 2. Taking the direction shown in the figure as an example, the airflow direction is set in the horizontal direction; in this embodiment, there is a height difference between the center line of the inlet channel 1 and the outlet channel 3 and any laminar channel 2, and an inlet buffer cavity 11 is set between the inlet channel 1 and the laminar channel 2, and an outlet buffer cavity 31 is set between the outlet channel 3 and the laminar channel 2. Avoid the inlet channel 1 directly facing the laminar channel 2 and the airflow cannot flow evenly to each laminar channel 2. In this embodiment, especially at the inlet end, the inlet buffer cavity 11 is set to achieve uniform distribution of gas in each laminar channel 2.

[0035] like Figure 1 As shown, the airflow direction of the detection channel 4 is perpendicular to the airflow direction of the laminar flow channel 2, and a plurality of detection channels 4 are distributed in the airflow direction.

[0036] In this embodiment, two detection channels 4 are provided, and two corresponding balancing channels 5 are also provided. The balancing channels 5 are flat, and their length direction is parallel to the airflow direction in the laminar flow channel 2; and a pair of balancing channels 5 have close first ends 51 and far-away second ends 52; the distance between the pair of first ends 51 is smaller than the distance between the axes of the pair of detection channels 4. Since the detection channel 4 and the balancing channel 5 are isobaric, the pair of first ends 51 is equivalent to shortening the distance between the pair of detection channels 4, thereby realizing the installation of the differential pressure sensor 9 in the application scenario.

[0037] The air pressure in the detection channel 4 is the same as the air pressure at the corresponding position in the laminar flow channel 2, and because the balancing channel 5 is connected to the detection channel 4, the air pressure in the balancing channel 5 is also the same as the air pressure in the detection channel 4, and the setting of the balancing channel 5 increases the space with equal pressure as that in the detection channel 4, which is convenient for the simultaneous installation of the pressure sensor 8 and the differential pressure sensor 9 in the application scenario. In addition, based on the setting of the balancing channel 5, it is possible to distribute a pair of detection channels 4 over long distances, realize the detection of pressure and differential pressure between long-distance positions, and provide a guarantee for improving the detection accuracy.

[0038] Specifically, Figure 1As shown, a pair of A points in the figure can be used to install the corresponding pressure sensor 8. Of course, the pressure sensor 8 can be installed at any position of the corresponding balancing flow channel 5, and can be reasonably selected according to the space in the application scenario. A pair of B points can be used to install the pressure difference sensor 9. Since the distance between the two detection pins of the pressure difference sensor 9 is limited, the distance between the pair of B points should be small enough to adapt the detection pin position of the pressure difference sensor 9. The pressure sensors 8 at the two A points respectively detect the air pressure in the corresponding balancing flow channel 5, that is, the air pressure at the corresponding position of the detection flow channel 4. By subtracting the data between the two, the pressure difference between the two detection flow channels 4 can be obtained; the pressure difference sensor 9 installed at the B point can directly detect the pressure difference between the two balancing flow channels 5, that is, the pressure difference between the two detection flow channels 4; therefore, it can be understood that the pressure difference sensor 9 and the pair of pressure sensors 8 always detect the pressure and pressure difference between two relatively long distances, and the data between the two can also be used for mutual verification, which further ensures the accuracy and effectiveness in the application scenario.

[0039] like Figure 2 As shown, in the application scenario, the laminar flow structure 7 is installed in the flow meter body 6 (the shaded part in the figure), the inlet flow channel 1 and the outlet flow channel 3 are both formed in the flow meter body 6, the laminar flow channel 2 is formed in the laminar flow structure 7, the detection flow channel 4 is opened in the laminar flow structure 7, and the balancing flow channel 5 is connected to the detection flow channel 4 and is located above the laminar flow structure 7.

[0040] Example 2

[0041] like Figure 3 As shown, a flow meter has a built-in flow channel structure, which is formed in the flow meter body 6 and the laminar flow structure 7, and includes an inlet flow channel 1, a laminar flow channel 2 and an outlet flow channel 3 which are sequentially connected along the air flow direction; there are at least two groups of through detection flow channels 4 between the laminar flow channels 2, and the end of each detection flow channel 4 has a balancing flow channel 5 with the same air pressure as that at the detection flow channel 4.

[0042] In this embodiment, the airflow direction corresponding to the air inlet end of the air inlet channel 1 and the air outlet end of the air outlet channel 3 is perpendicular to the airflow direction in the laminar flow channel 2. Taking the direction shown in the figure as an example, the airflow direction in the laminar flow channel 2 is horizontal, and the airflow directions in the air inlet channel 1 and the air outlet channel 3 are vertical. By setting the airflow direction vertical, the problem of uneven distribution of the airflow in the laminar flow channel 2 can also be avoided.

[0043] As for the airflow directions of the inlet air channel 1 and the outlet air channel 3, they can be reasonably selected according to the settings of the interfaces in the actual application process.

[0044] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the utility model.

Claims

1. A flow meter built-in flow channel structure, formed in a flow meter body (6) and a laminar flow structure (7), characterized in that: It comprises an inlet flow channel (1), a laminar flow channel (2) and an outlet flow channel (3) which are sequentially connected along the air flow direction; At least two groups of interlinked detection flow channels (4) are provided between the laminar flow channels (2), and the end of each detection flow channel (4) is provided with a balance flow channel (5) having an air pressure equal to that at the detection flow channel (4).

2. A flow meter built-in flow channel structure according to claim 1, characterized in that: The inlet flow channel (1), the laminar flow channel (2) and the outlet flow channel (3) are constructed in a symmetrical structure; The air flow directions corresponding to the air inlet end of the air inlet channel (1) and the air outlet end of the air outlet channel (3) are parallel to the air flow direction in the laminar flow channel (2).

3. A flow meter built-in flow channel structure according to claim 2, characterized in that: There is a height difference between the center lines of the inlet flow channel (1) and the outlet flow channel (3) and any of the laminar flow channels (2), and an inlet buffer chamber (11) is provided between the inlet flow channel (1) and the laminar flow channel (2), and an outlet buffer chamber (31) is provided between the outlet flow channel (3) and the laminar flow channel (2).

4. A flow meter built-in flow channel structure according to claim 1, characterized in that: The air flow directions corresponding to the air inlet end of the air inlet channel (1) and the air outlet end of the air outlet channel (3) are perpendicular to the air flow direction in the laminar flow channel (2).

5. A flow meter built-in flow channel structure according to claim 2 or 4, characterized in that: The airflow direction of the detection flow channel (4) is perpendicular to the airflow direction of the laminar flow channel (2), and a plurality of the detection flow channels (4) are distributed in the airflow direction.

6. A flow meter built-in flow channel structure according to claim 5, characterized in that: Two detection flow channels (4) are provided, and two corresponding balancing flow channels (5) are also provided.

7. A flow meter built-in flow channel structure according to claim 6, characterized in that: The balancing flow channel (5) is flat, and its length direction is parallel to the airflow direction in the laminar flow channel (2); and a pair of the balancing flow channels (5) have first ends (51) that are close to each other, and second ends (52) that are far away from each other.

8. A flow meter built-in flow channel structure according to claim 7, characterized in that: The distance between the pair of first ends (51) is smaller than the distance between the axes of the pair of detection flow channels (4).

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