Metal film box sensor with overload protection structure

Abstract

The utility model discloses a metal film box sensor with an overload protection structure, which comprises a shell, a connecting seat is fixedly connected on the shell, a cavity is arranged in the connecting seat, a connecting rod is movably connected in the cavity, a measuring assembly is arranged on the connecting rod, a buffer groove is arranged on the shell, and the buffer groove is connected with the connecting seat. A buffering groove is formed in the connecting rod, a buffering seat is fixedly connected in the buffering groove, a buffering assembly is arranged in the buffering seat, a transmission rod is fixedly connected to the connecting rod, and the buffering assembly corresponds to the transmission rod. The sensor buffering device has the advantages that the sensor is buffered through the buffering assembly, and the sensor is prevented from being damaged due to the fact that instantaneous pressure borne by the sensor is too large.

Description

Technical Field

[0001] This utility model relates to the field of metal diaphragm sensor technology, and more specifically, to a metal diaphragm sensor with an overload protection structure. Background Technology

[0002] Metal diaphragm sensors are high-precision sensors that measure resistance based on the deformation of a metal thin film. They are characterized by their compact structure, high sensitivity, and good stability, and are widely used in industrial automation, automotive engineering, and medical devices. When an external force or pressure is applied to the metal thin film, the film undergoes a slight deformation, causing a change in its resistance. This resistance change is converted into an electrical signal by a bridge circuit. After processing by the measurement circuit, a voltage or current signal proportional to the measured physical quantity is output. Publication number CN222318304U relates to the field of sensor technology, specifically a pressure sensor overload protection structure, including a sintering base. A lower substrate is fixedly connected to the top outer wall of the sintering base. A flat diaphragm is disposed on the top outer wall of the lower substrate. An upper substrate is disposed on the top outer wall of the flat diaphragm. A pressure-sensitive corrugated diaphragm is disposed on the top outer wall of the upper substrate. A pressure ring is provided on the top outer wall, and an installation groove is opened on the top outer wall of the sintering seat. An insulating cover is installed on the inner wall of the installation groove, and a chip is installed on the inner wall of the insulating cover. When the pressure reaches the overload pressure, the internal central diaphragm is completely attached, while the external pressure-sensitive corrugated diaphragm is not yet attached to the upper substrate contour. When the pressure continues to increase, the pressure-sensitive corrugated diaphragm and the contour are also attached. Thus, the overload protection of the sensor under high pressure is achieved by the double attachment of the two diaphragms, which can realize the overload protection of the pressure sensor and improve the working efficiency.

[0003] However, existing technologies have some problems: Overload protection of existing metal diaphragm sensors usually involves a rigid pin limiting the transmission rod to prevent the diaphragm from exceeding its maximum deformation range and causing damage. However, when pressure is applied to the sensor instantaneously, the rigid pin cannot slow down the displacement speed, causing the sensor to be transiently overloaded. The diaphragm deforms too quickly and cannot fully recover its elasticity, which leads to permanent damage or performance degradation of the sensor. Therefore, we propose a metal diaphragm sensor with an overload protection structure. Utility Model Content

[0004] One objective of this invention is to provide a new technical solution for a metal diaphragm sensor with an overload protection structure.

[0005] According to a first aspect of the present invention, a metal diaphragm sensor with an overload protection structure is provided, comprising a housing, a connecting seat fixedly connected to the housing, a cavity formed in the connecting seat, a connecting rod movably connected in the cavity, a measuring component disposed on the connecting rod, a buffer groove formed in the connecting seat, a buffer seat fixedly connected in the buffer groove, a buffer component disposed in the buffer seat, and a transmission rod fixedly connected to the connecting rod, the buffer component corresponding to the transmission rod.

[0006] Optionally, the measuring component includes a pressure plate, which is fixedly connected to one end of a connecting rod, and a first diaphragm is fixedly connected to the other end of the connecting rod, with a second diaphragm fixedly connected to the first diaphragm.

[0007] Optionally, a sealed space is formed between the first diaphragm and the second diaphragm, and strain gauges are fixedly connected to the outer walls of the first diaphragm and the second diaphragm.

[0008] Optionally, the buffer assembly includes a buffer cylinder, the buffer seat has a groove, the buffer cylinder is fixedly connected to the inner wall of the groove, and a buffer rod is movably connected inside the buffer cylinder.

[0009] Optionally, a buffer block is fixedly connected to one end of the buffer rod, and a first spring is fixedly connected to the other end of the buffer rod. The first spring is fixedly connected to the inner wall of the buffer cylinder.

[0010] Optionally, the buffer assembly further includes a buffer ring, which is fixedly connected to the outer wall of the buffer rod and movably connected within the gap between the buffer seat and the buffer cylinder.

[0011] Optionally, the buffer seat has a slide rail, a buffer plate is slidably connected in the slide rail, a second spring is fixedly connected to the buffer plate, the second spring is fixedly connected to the inner wall of the buffer seat, and the buffer plate corresponds to the buffer ring.

[0012] Optionally, a mounting plate is fixedly connected to the connector, and both the mounting plate and the outer casing have mounting holes. A wire is provided on the outer casing.

[0013] According to one embodiment of this disclosure, a buffer assembly is used to buffer the sensor to prevent damage caused by excessive pressure. The buffer assembly adopts a multi-level buffer structure, which absorbs and disperses impact energy through a graded design to prevent permanent damage or performance degradation of the sensor due to transient overload or extreme working conditions.

[0014] When the sensor is subjected to excessive pressure, the connecting rod displaces downward, and the transmission rod fixed on the connecting rod pushes the buffer block, causing the buffer rod to compress the first spring and move on the buffer cylinder. This causes the first spring to elastically deform, absorb and store energy, and then release the energy through the elastic recovery process, thereby buffering the pressure on the connecting rod and preventing the first and second diaphragms from being damaged by instantaneous impact.

[0015] When there is still a large impact force after the first spring has buffered the impact, the buffer rod will also drive the buffer ring to move. When the buffer ring moves to the buffer plate, it will push the buffer plate to compress the second spring and move along the slide. The second spring will further buffer the connecting rod, reduce the instantaneous impact force on the first diaphragm and the second diaphragm, and protect the first diaphragm and the second diaphragm.

[0016] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present invention and, together with their description, serve to explain the principles of the present invention.

[0018] Figure 1 This is a schematic diagram of the overall structure of a metal diaphragm sensor with an overload protection structure in one embodiment.

[0019] Figure 2 This is a cross-sectional view of the connector of a metal diaphragm sensor with an overload protection structure in one embodiment.

[0020] Figure 3 This is a schematic diagram of a strain gauge for a metal diaphragm sensor with an overload protection structure in one embodiment.

[0021] Figure 4 This is a cross-sectional view of the buffer seat of a metal diaphragm sensor with an overload protection structure in one embodiment;

[0022] Figure 5 This is a cross-sectional view of the buffer cylinder of a metal diaphragm sensor with an overload protection structure in one embodiment.

[0023] The following are labeled in the diagram: 1. Outer shell; 2. Connecting seat; 3. Connecting rod; 4. Measuring component; 41. Pressure plate; 42. First diaphragm; 43. Second diaphragm; 44. Strain gauge; 5. Buffer seat; 6. Buffer assembly; 61. Buffer cylinder; 62. Buffer rod; 63. Buffer block; 64. First spring; 65. Buffer ring; 66. Buffer plate; 67. Second spring; 7. Transmission rod; 8. Mounting plate; 9. Wire. Detailed Implementation

[0024] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0025] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0026] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0027] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0028] like Figure 1-5 As shown, a metal diaphragm sensor with an overload protection structure includes a housing 1 made of stainless steel. Its main function is to protect the internal components from environmental influences and ensure long-term stable operation of the device.

[0029] Furthermore, a connecting seat 2 is fixedly connected to the outer shell 1, and a cavity is opened inside the connecting seat 2. A connecting rod 3 is movably connected inside the cavity, and a measuring component 4 is provided on the connecting rod 3.

[0030] Specifically, the measuring component 4 includes a pressure plate 41, which is fixedly connected to one end of the connecting rod 3. A first diaphragm 42 is fixedly connected to the other end of the connecting rod 3, and a second diaphragm 43 is fixedly connected to the first diaphragm 42.

[0031] Furthermore, a sealed space is formed between the first diaphragm 42 and the second diaphragm 43, and strain gauges 44 are fixedly connected to the outer walls of the first diaphragm 42 and the second diaphragm 43.

[0032] Specifically, after the pressure plate 41 is subjected to external pressure, it is transmitted to the first diaphragm 42 and the second diaphragm 43 through the connecting rod 3. The first diaphragm 42 and the second diaphragm 43 deform under pressure, which causes the strain gauge 44 to deform. The resistance of the strain gauge 44 changes, which in turn changes the output voltage of the bridge circuit, thereby analyzing the pressure magnitude. The above measurement process is a mature existing technology, and it is believed that those skilled in the art are already very familiar with it, so it will not be described in detail here.

[0033] Furthermore, a buffer groove is provided on the connecting seat 2, and a buffer seat 5 is fixedly connected in the buffer groove. A buffer assembly 6 is provided in the buffer seat 5. A transmission rod 7 is fixedly connected to the connecting rod 3. The buffer assembly 6 corresponds to the transmission rod 7. There are four sets of buffer assemblies 6 and transmission rods 7, which are evenly distributed in a circle in the connecting seat 2 to ensure buffer balance.

[0034] Specifically, the buffer assembly 6 includes a buffer cylinder 61, a groove is provided in the buffer seat 5, the buffer cylinder 61 is fixedly connected to the inner wall of the groove, and a buffer rod 62 is movably connected in the buffer cylinder 61. When the buffer rod 62 contacts the bottom of the buffer cylinder 61, it is the maximum deformation range of the first diaphragm 42 and the second diaphragm 43.

[0035] Furthermore, a buffer block 63 is fixedly connected to one end of the buffer rod 62, and a first spring 64 is fixedly connected to the other end of the buffer rod 62. The first spring 64 is fixedly connected to the inner wall of the buffer cylinder 61.

[0036] Specifically, when the sensor is subjected to excessive pressure, the downward displacement of the connecting rod 3 increases, and the transmission rod 7 fixed on the connecting rod 3 will push the buffer block 63, causing the buffer rod 62 to compress the first spring 64 and move on the buffer cylinder 61. This allows the first spring 64 to elastically deform, absorb and store energy, and then release the energy through the elastic recovery process, thereby buffering the pressure on the connecting rod 3 and preventing the first diaphragm 42 and the second diaphragm 43 from being damaged by instantaneous impact.

[0037] Furthermore, the buffer assembly 6 also includes a buffer ring 65, which is fixedly connected to the outer wall of the buffer rod 62 and movably connected in the gap between the buffer seat 5 and the buffer cylinder 61.

[0038] Furthermore, a slide is provided inside the buffer seat 5, and a buffer plate 66 is slidably connected inside the slide. A second spring 67 is fixedly connected to the buffer plate 66 and is fixedly connected to the inner wall of the buffer seat 5. The buffer plate 66 corresponds to the buffer ring 65.

[0039] Specifically, when the first spring 64 still has a large impact force after buffering, the buffer rod 62 will also drive the buffer ring 65 to move. When the buffer ring 65 moves to the buffer plate 66, it will push the buffer plate 66 to compress the second spring 67 to move along the slide. The second spring 67 further buffers the connecting rod 3, reducing the instantaneous impact force it causes to the first diaphragm 42 and the second diaphragm 43, and protecting the first diaphragm 42 and the second diaphragm 43.

[0040] Furthermore, a mounting plate 8 is fixedly connected to the connecting base 2. Both the mounting plate 8 and the outer casing 1 have mounting holes. The sensor can be fixed to the device by passing a fixing screw through the mounting hole. A wire 9 is provided on the outer casing 1. The wire 9 is used to transmit electrical signals to the outside.

[0041] The aforementioned metal diaphragm sensor with an overload protection structure uses a buffer assembly 6 to buffer the sensor, preventing damage caused by excessive pressure. The buffer assembly 6 adopts a multi-level buffer structure, which absorbs and disperses impact energy through a graded design to prevent permanent damage or performance degradation of the sensor due to transient overload or extreme working conditions.

[0042] When the sensor is subjected to excessive pressure, the connecting rod 3 displaces downward, and the transmission rod 7 fixed on the connecting rod 3 pushes the buffer block 63, causing the buffer rod 62 to compress the first spring 64 and move on the buffer cylinder 61. This causes the first spring 64 to elastically deform, absorb and store energy, and then release the energy through the elastic recovery process, thereby buffering the pressure on the connecting rod 3 and preventing the first diaphragm 42 and the second diaphragm 43 from being damaged by instantaneous impact.

[0043] When there is still a large impact force after the first spring 64 has buffered the impact, the buffer rod 62 will also drive the buffer ring 65 to move. When the buffer ring 65 moves to the buffer plate 66, it will push the buffer plate 66 to compress the second spring 67 and move it along the slide. The second spring 67 will further buffer the connecting rod 3, reduce the instantaneous impact force on the first diaphragm 42 and the second diaphragm 43, and protect the first diaphragm 42 and the second diaphragm 43.

[0044] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A metal diaphragm sensor with an overload protection structure, comprising a housing (1), characterized in that: A connecting seat (2) is fixedly connected to the outer shell (1). A cavity is provided inside the connecting seat (2). A connecting rod (3) is movably connected inside the cavity. A measuring component (4) is provided on the connecting rod (3). A buffer groove is provided on the connecting seat (2). A buffer seat (5) is fixedly connected inside the buffer groove. A buffer component (6) is provided inside the buffer seat (5). A transmission rod (7) is fixedly connected to the connecting rod (3). The buffer component (6) corresponds to the transmission rod (7).

2. A metal diaphragm sensor with an overload protection structure according to claim 1, characterized in that: The measuring component (4) includes a pressure plate (41), which is fixedly connected to one end of a connecting rod (3). A first diaphragm (42) is fixedly connected to the other end of the connecting rod (3), and a second diaphragm (43) is fixedly connected to the first diaphragm (42).

3. A metal diaphragm sensor with an overload protection structure according to claim 2, characterized in that: A sealed space is formed between the first diaphragm (42) and the second diaphragm (43), and strain gauges (44) are fixedly connected to the outer walls of the first diaphragm (42) and the second diaphragm (43).

4. A metal diaphragm sensor with an overload protection structure according to claim 1, characterized in that: The buffer assembly (6) includes a buffer cylinder (61), a groove is provided in the buffer seat (5), the buffer cylinder (61) is fixedly connected to the inner wall of the groove, and a buffer rod (62) is movably connected in the buffer cylinder (61).

5. A metal diaphragm sensor with an overload protection structure according to claim 4, characterized in that: One end of the buffer rod (62) is fixedly connected to a buffer block (63), and the other end of the buffer rod (62) is fixedly connected to a first spring (64), which is fixedly connected to the inner wall of the buffer cylinder (61).

6. A metal diaphragm sensor with an overload protection structure according to claim 5, characterized in that: The buffer assembly (6) further includes a buffer ring (65), which is fixedly connected to the outer wall of the buffer rod (62) and is movably connected in the gap between the buffer seat (5) and the buffer cylinder (61).

7. A metal diaphragm sensor with an overload protection structure according to claim 6, characterized in that: The buffer seat (5) has a slide rail, and a buffer plate (66) is slidably connected in the slide rail. A second spring (67) is fixedly connected to the buffer plate (66), and the second spring (67) is fixedly connected to the inner wall of the buffer seat (5). The buffer plate (66) corresponds to the buffer ring (65).

8. A metal diaphragm sensor with an overload protection structure according to claim 1, characterized in that: A mounting plate (8) is fixedly connected to the connecting seat (2). Both the mounting plate (8) and the outer shell (1) are provided with mounting holes. A wire (9) is provided on the outer shell (1).

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