Sealing structure

Abstract

The utility model relates to the technical field of sealing pieces for flow meters, in particular to a sealing structure which comprises a gasket body and at least one group of buffer cavities formed in the gasket body. A separation part is arranged between the buffer cavities, the end, away from the separation part, of each buffer cavity is a first end, and the end, close to the separation part, of each buffer cavity is a second end; a pressure detection area deviating to the first end and a pressure difference detection area deviating to the second end are arranged in the buffer cavity; the interior of the pressure detection area is used for arranging pressure detection points, and the interior of the pressure difference detection area is used for arranging pressure difference detection points; and the distance between one group of pressure difference detection points is smaller than the distance between one group of pressure detection points. The laminar flow meter gasket is applied to sealing inside a laminar flow meter, the group of buffering cavities are formed in the gasket body and used for shortening the distance between the group of pressure difference detection points, and simultaneous layout of the pressure detection points and the pressure difference detection points is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing elements for flow meters, in particular to a sealing structure. Background Art

[0002] Laminar flow meter is an instrument that monitors fluid flow based on the principle of pressure difference. It is suitable for laminar flow state, so it can be considered that laminar flow state is a necessary condition for this flow meter. Since the fluid needs to flow through the inside of the laminar flow meter, the role of the sealing gasket set in the flow meter is to seal the fluid to avoid leakage. Since the sealing gasket plays a role in enhancing the sealing and reducing leakage, the accuracy and reliability of the flow meter can be improved. Therefore, it can be understood that the sealing gasket is one of the indispensable parts of the flow meter. During installation, it must be strictly carried out in accordance with the requirements to ensure that the sealing gasket is correctly installed and the surface is smooth and flat without scratches or defects to ensure reliable sealing.

[0003] For laminar flow meter structure, the flow rate of the fluid can be obtained by the pressure difference between the upstream and downstream of the fluid, so a sensor needs to be set to monitor the pressure difference of the fluid in the flow path in real time. Figure 1 As shown, a group of air holes need to be opened on the sealing gasket, and the air holes are connected to the channel for fluid flow in the laminar flow meter. Pressure sensors are installed at the corresponding air holes. Based on the difference P1-P2 of the data detected by the two pressure sensors, the pressure difference of the fluid at the corresponding positions of the two air holes can be obtained, and the flow rate of the fluid passing through the laminar flow meter can be calculated by the pressure difference. As for the opening positions of the two air holes, if the distance between the two is too small, the pressure difference will be very small, the flow calculation error will be large, and the accuracy will be low; therefore, in the specific implementation, in order to ensure the relative accuracy of the data, the distance between the two air holes cannot be too small.

[0004] However, based on the design of the sealing gasket in the traditional structure, for the measurement of the pressure difference, when it is necessary to meet the position requirement between the two measuring points, only two pressure sensors can be used, and a pressure difference sensor with a constant interface distance cannot be installed. As a result, there is a situation where it is impossible to promptly know when the pressure sensor fails, and there is also a problem of monitoring error when only two pressure sensors are used for measurement. Therefore, the utility model provides a sealing structure to solve the problems existing in the prior art. Utility Model Content

[0005] The utility model aims to provide a sealing structure to solve the problem in the prior art that the pressure difference monitoring of the flow meter is prone to errors and is difficult to be discovered in time due to defects of the sealing pad.

[0006] The technical solution of the utility model is: a sealing structure, comprising a gasket body, and at least one group of buffer cavities opened on the gasket body;

[0007] A partition is provided between a group of the buffer cavities, and an end of each buffer cavity away from the partition is a first end, and an end close to the partition is a second end; the buffer cavity has a pressure detection area biased toward the first end, and a pressure difference detection area biased toward the second end;

[0008] The pressure detection area is used for arranging pressure detection points, and the pressure difference detection area is used for arranging pressure difference detection points; the distance between a group of the pressure difference detection points is smaller than the distance between a group of the pressure detection points.

[0009] Preferably, a group of the buffer cavities have the same shape and size, and are constructed in an axisymmetric or rotationally symmetrical structure.

[0010] Preferably, the second end of each buffer cavity is constructed as a planar structure, and a distribution direction of a group of pressure difference detection points is perpendicular to the plane corresponding to the second end.

[0011] Preferably, the second end of each of the buffer chambers is constructed as a curved surface structure, and a group of the pressure difference detection points are distributed on a line connecting the centers of a pair of curved surface structures.

[0012] Preferably, the gasket body has a length direction and a width direction, and a group of the buffer cavities are distributed along the length direction of the gasket body.

[0013] Preferably, a distribution direction of a pair of the pressure detection points is parallel to the length direction of the gasket body.

[0014] Preferably, the structures corresponding to the area covered by the gasket body are of equal thickness.

[0015] Preferably, the distance between a pair of the pressure difference detection points is no more than 1 / 4 of the distance between a pair of the pressure detection points.

[0016] Compared with the prior art, the advantages of the utility model are:

[0017] (1) The utility model is applied to the internal sealing of a laminar flow meter. By opening a group of buffer cavities on the gasket body, the distance between a group of pressure difference detection points is shortened, thereby realizing the simultaneous layout of the pressure detection points and the pressure difference detection points. When it is applied to a laminar flow meter, the integrated setting of the pressure sensor and the pressure difference sensor is realized. The data between the two can be verified with each other, ensuring the measurement accuracy. At the same time, when one of them fails, timely feedback can be provided through monitoring data.

[0018] (2) The distance between a pair of pressure difference detection points is close to adapt to the structural design of the pressure difference sensor, and the distance between a pair of pressure detection points is far to extend the measurement distance and ensure the accuracy of pressure difference feedback; and, since each buffer cavity is isobaric, even if the distance between the pressure difference detection points is close, what is measured is the pressure difference between two distant points. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0020] Figure 1 It is a schematic diagram of a sealing structure in the prior art;

[0021] Figure 2 This is a schematic diagram of a sealing structure described in Example 1 of the utility model;

[0022] Figure 3 This is a front view of a sealing structure described in Example 1 of the utility model;

[0023] Figure 4 This is a schematic diagram of the buffer chamber described in Example 1 of the utility model;

[0024] Figure 5 This is a schematic diagram of the rotationally symmetrical arrangement of the buffer chamber described in Example 1 of the utility model;

[0025] Figure 6 This is a front view schematic diagram of a sealing structure described in Example 1 of the utility model in an application scenario;

[0026] Figure 7 This is a top view schematic diagram of a sealing structure described in Example 1 of the utility model in an application scenario;

[0027] Figure 8 This is a schematic diagram of a sealing structure described in Example 2 of the utility model;

[0028] Fig. 9 This is a schematic diagram of a sealing structure described in Example 3 of the utility model.

[0029] Wherein: 1. gasket body, 11. separator;

[0030] 2. Buffer cavity, 21. First end, 22. Second end, 23. Pressure detection area, 24. Pressure difference detection area, 25. Pressure detection point, 26. Pressure difference detection point;

[0031] 3. Pores. DETAILED DESCRIPTION

[0032] The following is a further detailed description of the present invention in conjunction with specific embodiments:

[0033] Example 1

[0034] like Figure 2 , Figure 3As shown, a sealing structure includes a gasket body 1 and at least one group of buffer cavities 2 opened on the gasket body 1; the structure corresponding to the area covered by the gasket body 1 is of equal thickness; the gasket body 1 has a length direction and a width direction, and a group of buffer cavities 2 are distributed along the length direction of the gasket body 1.

[0035] A group of buffer cavities 2 are provided with a partition 11, and an end of each buffer cavity 2 away from the partition 11 is a first end 21, and an end close to the partition 11 is a second end 22; Figure 4 As shown, the buffer cavity 2 has a pressure detection area 23 biased towards the first end 21, and a pressure difference detection area 24 biased towards the second end 22; the pressure detection area 23 is used to arrange the pressure detection points 25, and the pressure difference detection area 24 is used to arrange the pressure difference detection points 26; the distance S1 of a group of pressure difference detection points 26 is less than the distance S2 of a group of pressure detection points 25. In a specific implementation, the distance between a pair of pressure difference detection points 26 is not greater than 1 / 4 of the distance between a pair of pressure detection points 25.

[0036] like Figure 5 As shown, a group of buffer cavities 2 have the same shape and size and are constructed in a rotationally symmetrical structure; the second end 22 of each buffer cavity 2 is constructed as a plane structure, and the distribution direction of a group of pressure difference detection points 26 is perpendicular to the plane corresponding to the second end 22. The distribution direction of a pair of pressure detection points 25 is parallel to the length direction of the gasket body 1.

[0037] The sealing structure of the utility model is used for laminar flow meter. In application scenarios, such as Figure 6 , Figure 7 As shown, the gasket body 1 is arranged above the laminar structure, and then the buffer cavity 2 on the gasket body 1 is connected with the air hole 3 opened in the laminar structure. The air pressure in the buffer cavity 2 is the same as the flow air pressure in the corresponding air hole 3, and then by measuring the pressure difference in the two buffer cavities 2, the pressure difference between the two air holes 3 at farther positions can be obtained.

[0038] Since when the positions of the two air holes 3 are far enough apart, the measured pressure difference is more stable and more accurate, a pair of pressure detection points 25 distributed farther apart can also ensure better measurement stability of the corresponding installed pressure sensor; at the same time, due to the setting of the buffer cavity 2, it is possible to bring a pair of pressure difference detection points 26 closer, which meets the installation possibility of the pressure difference sensor, and the pressure difference sensor is still used to measure the pressure difference between a pair of relatively long distances, solving the problem of measuring the long-distance pressure difference with a short-distance interface; otherwise, if holes are directly opened on the gasket body 1 to form a pair of relatively close pressure difference detection points 26, it will have a greater impact on the stability of the final measured data.

[0039] Therefore, based on the design of the sealing structure in the utility model, it is possible to integrate the pressure sensor and the pressure difference sensor in the laminar flow meter, and the two can be verified with each other. When one of them fails, it can be discovered in time through data feedback, which is more feasible.

[0040] Example 2

[0041] like Figure 8 As shown, a sealing structure includes a gasket body 1 and at least one group of buffer cavities 2 opened on the gasket body 1; the group of buffer cavities 2 have the same shape and size and are constructed in a rotationally symmetrical structure.

[0042] In this embodiment, the partitions 11 between a group of buffer cavities 2 are parallel to the width direction of the gasket body 1 . At this time, a group of pressure difference detection points 26 and a group of pressure detection points 25 can be set in the same length direction parallel to the gasket body 1 .

[0043] Example 3

[0044] like Fig. 9 As shown, a sealing structure includes a gasket body 1, and at least one group of buffer cavities 2 opened on the gasket body 1; a partition 11 is provided between a group of buffer cavities 2, an end of each buffer cavity 2 away from the partition 11 is a first end 21, and an end close to the partition 11 is a second end 22; the second end 22 of each buffer cavity 2 is constructed as an arc-shaped structure, and a group of pressure difference detection points 26 are distributed on a line connecting the centers of a pair of arc-shaped structures.

[0045] In summary of the above embodiments, the utility model is applied to the internal sealing of a laminar flow meter. A group of buffer cavities 2 are opened on the gasket body 1 to shorten the distance between a group of differential pressure detection points 26, thereby realizing the simultaneous layout of the pressure detection points 25 and the differential pressure detection points 26. In the application scenario, the integrated setting of the pressure sensor and the differential pressure sensor is realized.

[0046] 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 sealing structure, characterized in that: It comprises a gasket body (1), and at least one group of buffer cavities (2) opened on the gasket body (1); A partition (11) is provided between a group of the buffer cavities (2); an end of each buffer cavity (2) away from the partition (11) is a first end (21), and an end close to the partition (11) is a second end (22); the buffer cavity (2) has a pressure detection area (23) biased towards the first end (21), and a pressure difference detection area (24) biased towards the second end (22); The pressure detection area (23) is used to arrange pressure detection points (25), and the pressure difference detection area (24) is used to arrange pressure difference detection points (26); the distance between a group of pressure difference detection points (26) is smaller than the distance between a group of pressure detection points (25).

2. A sealing structure according to claim 1, characterized in that: A group of the buffer cavities (2) have the same shape and size, and are constructed in an axisymmetric or rotationally symmetrical structure.

3. A sealing structure according to claim 2, characterized in that: The second end (22) of each buffer cavity (2) is constructed as a planar structure, and a distribution direction of a group of pressure difference detection points (26) is perpendicular to the plane corresponding to the second end (22).

4. A sealing structure according to claim 2, characterized in that: The second end (22) of each buffer cavity (2) is constructed as a curved surface structure, and a group of pressure difference detection points (26) are distributed on a line connecting the centers of a pair of curved surface structures.

5. A sealing structure according to any one of claims 1 to 4, characterized in that: The gasket body (1) has a length direction and a width direction, and a group of buffer cavities (2) are distributed along the length direction of the gasket body (1).

6. A sealing structure according to claim 5, characterized in that: The distribution direction of the pair of pressure detection points (25) is parallel to the length direction of the gasket body (1).

7. A sealing structure according to claim 1, characterized in that: The area covered by the gasket body (1) has structures of equal thickness corresponding to the area covered by the gasket body (1).

8. A sealing structure according to claim 1, characterized in that: The distance between a pair of the pressure difference detection points (26) is no greater than 1 / 4 of the distance between a pair of the pressure detection points (25).

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