An anti-interference pressure sensor installation structure

Abstract

The utility model relates to the technical field of pressure sensors, and discloses an anti-interference pressure sensor installation structure, including a mounting support, the mounting support including a nut and a screw, a through hole is opened through the axial center line of the nut and the screw, an internal thread is provided at the upper part of the through hole, a first vibration-damping pad and a second vibration-damping pad are provided between the nut and the pressure sensor, and a buffer is also provided in the lower through hole, the buffer includes a grid buffer surface, a circular arc windward surface is provided on one side of the grid buffer surface, and the circular arc windward surface includes a large circle inlet and a small circle outlet. The invention solves the problem in the prior art that during the start-up and operation of the air compressor, the vibration of the body and the exhaust pipe affects the life of the sensor, and the fluctuation of the sensor measurement value caused by the vibration increases the risk of damage to the air compressor rotor.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure sensors, in particular to an anti-interference pressure sensor installation structure. Background Art

[0002] Pressure sensor is the most commonly used sensor in industrial practice and instrument control, and is widely used in various industrial automatic control environments. Among them, the most widely used is the strain gauge pressure sensor, which has extremely low price, high accuracy and good linear characteristics.

[0003] In existing air compressors, pressure sensors are generally installed on the exhaust pipe. During the start-up and shutdown and operation of the air compressor, vibration of the machine body and the exhaust pipe is difficult to avoid, resulting in unstable gas flow pressure. On the one hand, due to the different stress amplitudes excited by the air flow pulsation frequency, different degrees of vibration are caused, thereby increasing the impact damage to the surface of the pressure sensor diaphragm and reducing the service life of the pressure sensor. On the other hand, the fluctuation of the measured value of the pressure sensor acts on the frequency converter through the controller, resulting in large fluctuations in the frequency of the frequency converter, which makes the air compressor rotor speed fluctuate greatly, which may cause the stress amplitude of the rotor and other components to increase, thereby increasing the risk of rotor component breakage. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide an interference-resistant pressure sensor installation structure to solve the problem in the prior art that during the startup and operation of the air compressor, the vibration of the body and the exhaust pipe affects the life of the sensor and the fluctuation of the sensor measurement value caused by the vibration increases the risk of damage to the air compressor rotor.

[0005] The utility model solves the above technical problems through the following technical means: an anti-interference pressure sensor mounting structure, including a mounting support for mounting the pressure sensor, the mounting support including a nut and a screw, a through hole is opened through the axial center line of the nut and the screw, an internal thread is provided on the upper part of the through hole, the internal thread is used to connect the threaded air inlet of the pressure sensor, a first vibration damping pad and a second vibration damping pad are provided between the mounting support and the pressure sensor, a buffer is also provided in the through hole at the lower part, the buffer includes a grid buffer surface, a circular arc windward surface is provided on one side of the grid buffer surface, and the circular arc windward surface includes a large circle inlet and a small circle outlet.

[0006] Optionally, a plurality of groups of symmetrically arranged windward inclined surfaces are provided at the bottom of the mesh buffer surface to make the airflow passing through the mesh buffer surface more uniform and stable.

[0007] Optionally, the diameter of the small round outlet is greater than or equal to the diameter of the threaded gas inlet, thereby ensuring the gas flow into the pressure sensor.

[0008] Optionally, the grid buffer surface is arranged on the large circle inlet side of the arc windward surface, so that the airflow entering the pressure sensor first passes through the grid buffer surface and then passes through the buffer of the arc windward surface, thereby reducing the pressure fluctuation of the airflow entering the pressure sensor.

[0009] Optionally, the mesh buffer surface is arranged on the side of the small circle outlet of the arc windward surface, so that the airflow entering the pressure sensor first passes through the buffering and deceleration of the arc windward surface, and then enters the mesh buffer surface at the small circle outlet, so as to achieve further buffering and pressure stabilization.

[0010] Optionally, the first vibration damping pad is a polytetrafluoroethylene vibration damping pad, and the second vibration damping pad is a rubber vibration damping pad. By providing the first vibration damping pad and the second vibration damping pad, the vibration of the air compressor body or the exhaust pipe is further reduced when it is transmitted to the pressure sensor.

[0011] Optionally, the buffer is glued or interference-fitted with the inner wall of the through hole to ensure that the buffer is firmly connected to the through hole.

[0012] Beneficial effects of the utility model:

[0013] The utility model further reduces the vibration of the air compressor body or the exhaust pipe when it is transmitted to the pressure sensor through the arrangement of the first vibration damping pad and the second vibration damping pad. At the same time, due to the arrangement of the buffer member in the through hole of the mounting support, the airflow entering the pressure sensor passes through the two-stage buffering of the grid buffer surface and the arc windward surface, thereby reducing the pressure fluctuation of the airflow entering the pressure sensor, making the airflow passing through the buffer member more uniform and stable. Under the joint action of the vibration damping pad and the buffer member, the interference to the pressure sensor caused by the vibration is reduced, and the fluctuation of the sensor measurement value is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 It is a cross-sectional schematic diagram of the mounting support and a buffer member of the utility model;

[0016] Figure 3 It is a schematic diagram of the windward slope of the utility model;

[0017] Figure 4 It is a cross-sectional schematic diagram of another buffer component of the utility model.

[0018] Among them, 1-mounting support, 11-nut, 12-screw, 13-through hole, 21-first shock-absorbing pad, 22-second shock-absorbing pad, 3-buffer, 31-grid buffer surface, 311-windward inclined surface, 32-arc windward surface, 321-large circle inlet, 322-small circle outlet, 4-pressure sensor. DETAILED DESCRIPTION

[0019] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are only for exemplary descriptions, and they are only schematic diagrams, not physical diagrams, and cannot be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts in the figures may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the figures may be omitted.

[0020] The same or similar numbers in the figures of the embodiments of the present invention correspond to the same or similar parts. In the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the figures, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the figures are only used for illustrative purposes and cannot be understood as limitations on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0021] like Figure 1-Figure 4 As shown in FIG. 1 , an anti-interference pressure sensor installation structure of the utility model is shown. Figure 1 As shown, it includes a mounting support 1, and the mounting support 1 includes a nut 11 and a screw rod 12. Figure 2 As shown, a through hole 13 is opened on the axial center line passing through the nut 11 and the screw rod 12, and an internal thread is provided on the upper part of the through hole 13. The upper internal thread of the through hole 13 is used to connect to the threaded air inlet of the pressure sensor 4. The pressure sensor 4 is a strain type pressure sensor with a pressure-sensitive diaphragm. The screw rod 12 is used to connect to the air compressor body or the exhaust pipe of the air compressor, and the lower end of the through hole is used to connect to the air compressor body or the exhaust pipe of the air compressor.

[0022] In this embodiment, if Figure 1 As shown, a first vibration damping pad 21 and a second vibration damping pad 22 are provided between the mounting support 1 and the pressure sensor 4. The first vibration damping pad 21 is a polytetrafluoroethylene vibration damping pad, and the second vibration damping pad 22 is a rubber vibration damping pad, wherein the thickness of the polytetrafluoroethylene vibration damping pad is slightly greater than that of the rubber vibration damping pad. Through the two-stage vibration damping pad, the vibration transmitted to the body of the pressure sensor 4 is reduced, and the interference of the vibration on the pressure sensor 4 is reduced, thereby reducing the fluctuation of the measured value of the pressure sensor 4. A buffer 3 is also provided in the through hole 13 at the bottom, and the length of the internal thread is slightly shorter than that of the through hole 13, so that the lower inner wall of the through hole 13 is convenient for installing the buffer 3, and the buffer 3 is glued to the inner wall of the through hole 13.

[0023] In this embodiment, if Figure 2 As shown, the buffer 3 includes a grid buffer surface 31, and a circular arc windward surface 32 is extended on one side of the top of the grid buffer surface 31. The circular arc windward surface 32 includes a large circular inlet 321 and a small circular outlet 322. The diameter of the large circular inlet 321 is slightly greater than the diameter of the campus through hole 13, the outer diameter of the buffer 3 at the large circular inlet 321 is the same as the inner diameter of the through hole 13, and the diameter of the small circular outlet 322 is slightly greater than or equal to the diameter of the threaded air inlet. In this embodiment, the grid buffer surface 31 is arranged on one side of the large circular inlet 321 of the circular arc windward surface 32, so that the entire buffer 3 is similar to a bottomless bowl-shaped structure. At this time, the airflow entering the pressure sensor 4 first passes through the grid buffer surface 31, and then passes through the buffering of the circular arc windward surface 32. By setting the circular arc windward surface 32, the circular arc windward surface 32 plays a buffering role, controls the flow of the airflow entering the pressure sensor 4, and reduces the pressure fluctuation of the airflow entering the pressure sensor 4 when the flow pressure is unstable.

[0024] In this embodiment, if Figure 3 As shown, on the side away from the arc windward surface 32, a plurality of groups of symmetrically arranged windward slopes 311 are provided at the bottom of the grid buffer surface 31. Specifically, in the present example, the grid buffer surface 31 is composed of a plurality of concentric circles and evenly distributed ribs, and the two side edges of each concentric circle and rib on the bottom surface on the air intake side form the windward slope 311 in a chamfer-like form. Similarly, in some embodiments, the windward slope 311 can also be provided in the form of a cross grid, so that the airflow passing through the grid buffer surface 31 is more uniform and stable, reducing the oscillation impact of the airflow entering the pressure sensor 4 on the diaphragm, and avoiding the adverse consequences caused by large fluctuations in the data measured by the sensor.

[0025] In some embodiments, Figure 4 As shown, the grid buffer surface 31 can also be set on the side of the small circle outlet 322 of the arc windward surface 32. At this time, the airflow entering the pressure sensor 4 first passes through the buffering and deceleration of the arc windward surface 32, and then enters the grid buffer surface 31 at the small circle outlet 322 for further buffering and flow stabilization.

[0026] In some embodiments, the buffer 3 and the inner wall of the through hole 13 can be connected in other forms. For example, the buffer 3 can be integrally formed of hard plastic, and the major diameter of the buffer 3 is slightly larger than the diameter of the through hole 13. The buffer 3 is inserted into the through hole 13 by utilizing the elasticity of the material of the buffer 3, and the buffer 3 is fixed by the interference fit of the two. The advantage of such a setting is that the buffer 3 can be replaced.

[0027] The working principle of the utility model is as follows:

[0028] like Figure 1As shown, when installing the pressure sensor 4, first connect the mounting support 1 with the air compressor body or the exhaust pipe through threads, and then use the threaded air inlet of the pressure sensor 4 to pass through the first vibration damping pad 21 and the second vibration damping pad 22 and connect with the internal thread of the mounting support 1 to complete the installation. Through the arrangement of the first vibration damping pad 21 and the second vibration damping pad 22, the vibration of the air compressor body or the exhaust pipe is further reduced when it is transmitted to the pressure sensor 4. At the same time, due to the arrangement of the buffer member 3 in the through hole 13 of the mounting support 1, the airflow entering the pressure sensor 4 passes through the two-stage buffering of the grid buffer surface 31 and the arc windward surface 32, reducing the pressure fluctuation of the airflow entering the pressure sensor 4, and the combined effect reduces the interference of the vibration on the pressure sensor 4, reduces the fluctuation of the sensor measurement value, and realizes the self-protection of the pressure sensor 4 when the air compressor is started and stopped.

[0029] The above embodiments are only used to illustrate the technical solution of the utility model and are not intended to limit it. Although the utility model is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model. The technology, shape, and structure that are not described in detail in the utility model are all well-known technologies.

Claims

1. An anti-interference pressure sensor mounting structure, comprising a mounting support (1) for mounting a pressure sensor (4), the mounting support (1) comprising a nut (11) and a screw (12), a through hole (13) penetrating the axial center line of the nut (11) and the screw (12), an internal thread being provided at the upper portion of the through hole (13), the internal thread being used to connect to a threaded air inlet of the pressure sensor, characterized in that: A first vibration damping pad (21) and a second vibration damping pad (22) are provided between the mounting support (1) and the pressure sensor (4), and a buffer member (3) is also provided in the through hole (13) at the bottom, the buffer member (3) comprising a grid buffer surface (31), a circular arc windward surface (32) being provided on one side of the grid buffer surface (31), and the circular arc windward surface (32) comprising a large circular inlet (321) and a small circular outlet (322).

2. The anti-interference pressure sensor installation structure according to claim 1, characterized in that: The bottom of the grid buffer surface (31) is provided with a plurality of groups of symmetrically arranged windward inclined surfaces (311).

3. The anti-interference pressure sensor installation structure according to claim 1, characterized in that: The diameter of the small round outlet (322) is greater than or equal to the diameter of the threaded air inlet.

4. The anti-interference pressure sensor installation structure according to claim 1, characterized in that: The grid buffer surface (31) is arranged on one side of the large circle inlet (321) of the circular arc windward surface (32).

5. The anti-interference pressure sensor installation structure according to claim 1, characterized in that: The grid buffer surface (31) is arranged on one side of the small circular outlet (322) of the circular arc windward surface (32).

6. The anti-interference pressure sensor installation structure according to claim 1, characterized in that: The first vibration damping pad (21) is a polytetrafluoroethylene vibration damping pad, and the second vibration damping pad (22) is a rubber vibration damping pad.

7. The anti-interference pressure sensor installation structure according to claim 1, characterized in that: The buffer member (3) is glued or interference-fitted with the inner wall of the through hole (13).

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