A pressure sensor with anti-hammer function

Abstract

This utility model discloses a pressure sensor with water hammer protection, comprising a housing. Inside the housing, an impact-resistant diaphragm, a core, a clamping ring, and an end cap are sequentially stacked along the axial direction. The end cap is fixed to the end of the housing via a threaded connection, tightly confining the impact-resistant diaphragm, core, and clamping ring within the housing, ensuring stable installation of all components inside the pressure sensor. The impact-resistant diaphragm is a circular metal diaphragm, its edge abutting against the inner bottom of the housing through the bottom of the core. Multiple guide holes are evenly distributed along the circumference of the impact-resistant diaphragm near its outer peripheral wall, penetrating its upper and lower surfaces. This utility model, through optimized internal structural design, effectively protects against water hammer effects, safeguarding the core from instantaneous impact damage, while simultaneously ensuring the sensor's assembly stability and detection accuracy.

Description

Technical Field

[0001] This utility model relates to the field of pressure sensor application technology, and in particular to a pressure sensor with a water hammer prevention function. Background Technology

[0002] In practical applications of pressure sensors, especially in liquid pressure detection scenarios, the problem of water hammer effect is often encountered. Water hammer effect refers to the sudden change in liquid flow velocity caused by sudden opening or closing of valves, sudden start-up or shutdown of pumps, etc., when liquid flows in a pipeline, resulting in instantaneous impact pressure. This instantaneous impact pressure will directly act on the core detection component of the pressure sensor - the core. Long-term or frequent impacts can easily damage the core, which not only shortens the service life of the sensor, but also leads to distortion of detection data, affecting the stability and reliability of the entire detection system.

[0003] Most existing pressure sensors do not have a dedicated protective structure for water hammer effect and rely solely on the strength of the core itself to resist impact, resulting in limited protection. Some sensors with protective structures either have complex structures and are difficult to assemble, or their protective performance is insufficient and cannot effectively reduce water hammer impact. Therefore, this utility model proposes a pressure sensor with water hammer protection function. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a pressure sensor with water hammer protection function. By optimizing the internal structure design, it can effectively protect against water hammer effect, protect the core from instantaneous impact damage, and at the same time ensure the assembly stability and detection accuracy of the sensor.

[0005] To solve the above-mentioned technical problems, the present invention adopts a technical solution as follows: a pressure sensor with anti-hammer function is provided, including a housing, wherein an anti-impact diaphragm, a core, a clamping ring and an end cap are stacked sequentially along the axial direction inside the housing, and the end cap is fixed to the end of the housing by a threaded connection, so as to tightly confine the anti-impact diaphragm, the core and the clamping ring inside the housing, and ensure the stable installation of each component inside the pressure sensor.

[0006] The shock-resistant diaphragm is a circular metal diaphragm, the edge of which is pressed against the inner bottom of the outer shell through the bottom of the core. The shock-resistant diaphragm has a plurality of guide holes that penetrate the upper and lower surfaces of the diaphragm evenly opened in the circumferential direction near the outer peripheral wall, so as to divert the liquid entering the inner shell and prevent the instantaneous impact force generated by the water hammer effect of the liquid during detection from directly causing impact damage to the core.

[0007] The present invention is further configured such that: a settling groove is provided at the center of the bottom of the outer shell, and the inner diameter of the settling groove is smaller than the outer diameter of the anti-impact diaphragm; the lower surface of the anti-impact diaphragm and the wall of the settling groove together form a buffer cavity.

[0008] With the above technical solution, when the liquid carrying water hammer impact pressure enters the shell, it first enters the buffer chamber formed by the settling tank and the anti-impact diaphragm. The buffer chamber can play a preliminary role in unloading the instantaneous impact of the liquid, reducing the initial intensity of the liquid impact. At the same time, the buffer chamber can guide the liquid to be evenly distributed under the anti-impact diaphragm, avoiding the liquid from concentrating and impacting the local area of ​​the diaphragm. Combined with the diversion effect of the subsequent guide holes, the impact of water hammer impact on the core is further weakened.

[0009] The present invention is further configured such that: the end of the outer shell away from the end cap extends to a liquid inlet, and the liquid inlet and the outer shell are integrally formed; the liquid inlet and the outer shell are arranged on the same axis and are connected to the settling tank provided inside the outer shell; the outer diameter of the liquid inlet is smaller than the inner diameter of the outer shell, and the inner diameter of the liquid inlet is smaller than the inner diameter of the circumference formed by the centers of multiple guide holes.

[0010] Through the above technical solutions, the integrated liquid inlet and the outer shell can improve the overall sealing and structural strength of the structure, and prevent liquid from leaking from the connection gaps. The coaxial design can ensure that the liquid enters the settling tank smoothly along the axis, reduce the turbulence at the inlet, and reduce the risk of additional impact caused by turbulence. At the same time, the inner diameter of the liquid inlet is smaller than the inner diameter of the circumference formed by the center of the guide hole, which can ensure that the liquid flowing in from the liquid inlet can completely cover the guide hole area below the anti-impact diaphragm, so that the liquid can be evenly distributed when passing through the guide hole, avoiding the reduction of the distribution effect due to the partial emptiness of the guide hole, and ensuring the stability of the water hammer protection.

[0011] The present invention is further configured such that: an external wire is electrically connected to the top of the core; the clamping ring is an annular structure with a through hole in its center for the external wire to pass through; a wire hole is provided in the middle of the end face of the end cap for the external wire to pass through; the external wire passes through the through hole of the clamping ring and the wire hole of the end cap in sequence; and sealant is filled between the external wire and the wire hole of the end cap.

[0012] Through the above technical solution, the through hole of the clamping ring and the wire hole of the end cap can play a positioning and guiding role for the external wiring of the core, preventing the external wiring from becoming loose from the connection end with the core due to pulling or shaking during the installation or use of the sensor, ensuring the stability of electrical signal transmission. The sealant filled in the wire hole can effectively block external liquids, dust and other impurities from entering the housing through the wire hole, preventing the core from getting damp or contaminated by impurities, and improving the environmental adaptability and service life of the sensor.

[0013] The present invention is further configured such that: the clamping ring is pressed against the top of the core near the outer peripheral wall, and the outer diameter of the clamping ring is adapted to the inner diameter of the outer shell, and the clamping ring is made of polytetrafluoroethylene.

[0014] Through the above technical solution, the clamping ring is pressed against the outer peripheral wall of the core, which can evenly transmit the pressure of the core to the inner wall of the shell, avoiding damage to the core due to localized stress concentration. The outer diameter of the clamping ring is adapted to the inner diameter of the shell, which can ensure that the clamping ring does not wobble inside the shell, further improving the installation stability of the core and the anti-impact diaphragm. In addition, the polytetrafluoroethylene material has excellent corrosion resistance, high temperature resistance and low coefficient of friction, which can not only adapt to various liquid detection environments, but also avoid wear caused by friction between the clamping ring and the core and shell, thus extending the service life of the components.

[0015] The present invention is further configured such that: an annular groove is formed on the outer peripheral wall of the end cap near the end face along the circumferential direction, and a sealing ring is embedded in the annular groove.

[0016] With the above technical solution, when the end cap and the outer shell are connected by threads, the sealing ring in the annular groove will be squeezed and deformed to fill the gap between the end cap and the inner wall of the outer shell, forming a reliable sealing structure. This sealing structure can prevent external liquids, gases or impurities from entering the interior from the connection gap between the end cap and the outer shell, protect the core and other components from the influence of the external environment, and at the same time avoid internal liquid leakage, ensuring the accuracy of pressure detection.

[0017] The present invention is further configured such that: the end cap is provided with two sets of interconnected vent holes and side holes, the vent holes penetrate the upper and lower surfaces of the end cap along the axial direction, and the vent holes and wire holes are not interconnected, and the side holes are opened radially in the annular groove.

[0018] Through the above technical solution, the combination of the vent and the side hole can realize the communication between the inside of the shell and the outside atmosphere, and balance the air pressure inside the shell. When the sensor performs pressure detection, the air pressure above the core will fluctuate due to temperature changes or slight deformation of the core. The vent and the side hole can timely discharge or draw in air, avoiding the internal air pressure fluctuation from affecting the detection accuracy of the core. At the same time, the side hole is opened in the annular groove, and the sealing effect of the sealing ring can be used to prevent external impurities from entering the shell through the vent and the side hole, ensuring that the ventilation function and the sealing function do not interfere with each other.

[0019] The beneficial effects of this utility model are as follows:

[0020] This invention proposes a pressure sensor with water hammer protection function. By setting an impact-resistant diaphragm inside the housing and evenly opening guide holes on the outer periphery of the diaphragm, and forming a buffer chamber with the settling groove at the bottom of the housing, a dual water hammer protection structure of buffering and diversion is constructed. When liquid carrying instantaneous impact pressure enters the sensor, the buffer chamber first initially relieves the impact pressure, and then the guide holes evenly divert the liquid, avoiding the instantaneous impact force generated by the water hammer effect from directly acting on the core. This effectively reduces the probability of core damage due to impact, extends the service life of the sensor, and ensures the accuracy and stability of the detection data. Attached Figure Description

[0021] Figure 1 This is a first structural diagram of a pressure sensor with a waterproof hammer function according to this utility model;

[0022] Figure 2 This is a second structural diagram of a pressure sensor with a waterproof hammer function according to this utility model;

[0023] Figure 3 This is a cross-sectional view of a pressure sensor with a waterproof hammer function according to this utility model;

[0024] Figure 4 This is an exploded view of a pressure sensor with a waterproof hammer function according to this utility model.

[0025] Figure 5 This is a structural diagram of the end cap of a pressure sensor with a waterproof hammer function according to this utility model;

[0026] Figure 6 This is a cross-sectional view of the end cap of a pressure sensor with a water-resistant hammer function according to this utility model.

[0027] In the diagram: 1. Outer shell; 11. Liquid inlet end; 2. Shock-resistant diaphragm; 21. Flow guide hole; 3. Core; 4. Clamping ring; 5. End cap; 51. Wire hole; 52. Annular groove; 53. Vent hole; 54. Side hole. Detailed Implementation

[0028] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0029] like Figures 1-4 As shown, a pressure sensor with anti-hammer function includes a housing 1. An anti-impact diaphragm 2, a core 3, a clamping ring 4 and an end cap 5 are stacked sequentially along the axial direction inside the housing 1. The end cap 5 is fixed to the end of the housing 1 by a threaded connection to tightly confine the anti-impact diaphragm 2, the core 3 and the clamping ring 4 inside the housing 1, ensuring the stable installation of each component inside the pressure sensor.

[0030] like Figure 3 and Figure 4 As shown, the anti-impact diaphragm 2 is a circular metal diaphragm, the edge of which is pressed against the inner bottom of the outer shell 1 through the bottom of the core 3. The anti-impact diaphragm 2 has a plurality of guide holes 21 evenly distributed in the circumferential direction near the outer peripheral wall, penetrating the upper and lower surfaces of the anti-impact diaphragm 2, so as to divert the liquid entering the inner shell 1 and prevent the instantaneous impact force generated by the water hammer effect of the liquid during detection from directly impacting and damaging the core 3. A settling groove is provided at the center of the inner bottom of the outer shell 1, and the inner diameter of the settling groove is smaller than the outer diameter of the anti-impact diaphragm 2. The lower surface of the anti-impact diaphragm 2 and the groove wall of the settling groove together form a buffer cavity. When the liquid carrying the water hammer impact pressure enters the inner shell 1, it first enters the buffer cavity formed by the settling groove and the anti-impact diaphragm 2. The buffer cavity can play a preliminary role in unloading the instantaneous impact of the liquid, reducing the initial intensity of the liquid impact. At the same time, the buffer cavity can guide the liquid to be evenly distributed below the anti-impact diaphragm 2, avoiding the liquid from concentrating and impacting a local area of ​​the diaphragm. Combined with the diversion effect of the subsequent guide holes 21, the impact of the water hammer impact on the core 3 is further weakened.

[0031] like Figure 2 and Figure 3 As shown, the end of the outer shell 1 away from the end cap 5 extends to a liquid inlet 11, and the liquid inlet 11 and the outer shell 1 are integrally formed, which can improve the sealing performance and structural strength of the overall structure and prevent liquid leakage from the connection gap. The liquid inlet 11 and the outer shell 1 are arranged on the same axis and are connected to the settling tank inside the outer shell 1. The coaxial design can ensure that the liquid enters the settling tank smoothly along the axis, reduce the turbulence phenomenon at the inlet, and reduce the risk of additional impact caused by turbulence. The outer diameter of the liquid inlet 11 is smaller than the inner diameter of the outer shell 1, and the inner diameter of the liquid inlet 11 is smaller than the inner diameter of the circle formed by the centers of multiple guide holes 21. This can ensure that the liquid flowing in from the liquid inlet 11 can completely cover the area of ​​the guide holes 21 below the anti-impact diaphragm 2, so that the liquid can be evenly distributed when passing through the guide holes 21, avoiding the reduction of the distribution effect due to the partial emptiness of the guide holes 21, and ensuring the stability of the anti-hammer protection.

[0032] like Figure 3 and Figure 6As shown, the top of the core 3 is electrically connected to an external wire. The clamping ring 4 is a ring structure with a through hole in its center for the external wire to pass through. The end cover 5 has a wire hole 51 in the middle of its end face for the external wire to pass through. The external wire passes through the through hole of the clamping ring 4 and the wire hole 51 of the end cover 5 in sequence, which can position and guide the external wire of the core 3, and prevent the external wire from becoming loose from the connection end of the core 3 due to pulling or shaking during the installation or use of the sensor, thus ensuring the stability of the electrical signal transmission. In addition, the space between the external wire and the wire hole 51 of the end cover 5 is filled with sealant, which can effectively block external liquids, dust and other impurities from entering the interior of the outer shell 1 through the wire hole 51, preventing the core 3 from getting damp or contaminated by impurities, and improving the environmental adaptability and service life of the sensor.

[0033] The clamping ring 4 is pressed tightly against the top of the core 3 near the outer peripheral wall, which can evenly transmit the pressure of the core 3 to the inner wall of the outer shell 1, avoiding damage to the core 3 due to localized force concentration. In addition, the outer diameter of the clamping ring 4 is matched with the inner diameter of the outer shell 1, which can ensure that the clamping ring 4 does not wobble inside the outer shell 1, further improving the installation stability of the core 3 and the anti-impact diaphragm 2. At the same time, the clamping ring 4 is made of polytetrafluoroethylene (PTFE), which has excellent corrosion resistance, high temperature resistance and low coefficient of friction. It can not only adapt to various liquid detection environments, but also avoid wear caused by friction between the clamping ring 4 and the core 3 and the outer shell 1, thus extending the service life of the components.

[0034] like Figure 5 and Figure 6 As shown, an annular groove 52 is formed on the outer peripheral wall of the end cap 5 near the end face along the circumferential direction, and a sealing ring is embedded in the annular groove 52. When the end cap 5 and the outer shell 1 are connected by threads, the sealing ring in the annular groove 52 will be squeezed and deformed to fill the gap between the end cap 5 and the inner wall of the outer shell 1, forming a reliable sealing structure. This sealing structure can prevent external liquids, gases or impurities from entering the interior from the connection gap between the end cap 5 and the outer shell 1, protect the core 3 and other components from the influence of the external environment, and at the same time avoid internal liquid leakage, ensuring the accuracy of pressure detection.

[0035] The end cap 5 is also provided with two sets of interconnected vent holes 53 and side holes 54. The vent holes 53 penetrate the upper and lower surfaces of the end cap 5 axially, and the vent holes 53 and the wire holes 51 are not interconnected. The cooperation of the vent holes 53 and the side holes 54 can realize the communication between the inside of the outer shell 1 and the outside atmosphere, and balance the air pressure inside the outer shell 1. When the sensor performs pressure detection, the air pressure above the core 3 will fluctuate due to temperature changes or slight deformation of the core. The vent holes 53 and the side holes 54 can timely discharge or draw in air to avoid the internal air pressure fluctuation affecting the detection accuracy of the core 3. The side holes 54 are radially opened in the annular groove 52. The sealing effect of the sealing ring can be used to prevent external impurities from entering the inside of the outer shell 1 through the vent holes 53 and the side holes 54, ensuring that the ventilation function and the sealing function do not interfere with each other.

[0036] In use, liquid enters the settling tank of the outer shell 1 through the inlet end 11. The instantaneous impact pressure generated by the water hammer effect is initially weakened by the buffer chamber formed by the settling tank and the anti-impact diaphragm 2. Subsequently, the liquid is evenly distributed along the buffer chamber and diverted through the guide hole 21 on the anti-impact diaphragm 2, further reducing the impact intensity. The diverted liquid acts smoothly on the core 3, which converts the pressure signal into an electrical signal and transmits it to the external detection equipment through the external wiring. At the same time, the air pressure inside the outer shell 1 is balanced with the outside through the vent hole 53 and side hole 54 of the end cover 5, ensuring detection accuracy. The sealing ring in the annular groove 52 ensures the sealing of the overall structure and prevents liquid leakage.

[0037] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A pressure sensor with a water hammer protection function comprising a housing (1), characterized in that: The inner side of the outer shell (1) is provided with an anti-impact diaphragm (2), a core (3), a clamping ring (4) and an end cap (5) stacked in sequence along the axial direction. The end cap (5) is fixed to the end of the outer shell (1) by a threaded connection, so as to tightly limit the anti-impact diaphragm (2), the core (3) and the clamping ring (4) inside the outer shell (1) and ensure the stable installation of each component inside the pressure sensor. The shock-resistant diaphragm (2) is a circular metal diaphragm with its edge pressed against the bottom of the outer shell (1) through the bottom of the core (3). The shock-resistant diaphragm (2) has a plurality of guide holes (21) that penetrate the upper and lower surfaces of the shock-resistant diaphragm (2) evenly opened in the circumferential direction near the outer peripheral wall, so as to divert the liquid entering the inner shell (1) and prevent the instantaneous impact force generated by the water hammer effect of the liquid during detection from directly causing impact damage to the core (3).

2. The pressure sensor with a water hammer prevention function according to claim 1, characterized in that: A settling groove is provided at the center of the bottom of the outer shell (1), and the inner diameter of the settling groove is smaller than the outer diameter of the anti-impact diaphragm (2). The lower surface of the anti-impact diaphragm (2) and the wall of the settling groove together form a buffer cavity.

3. The pressure sensor with a water hammer protection function according to claim 2, characterized in that: The outer shell (1) extends to a liquid inlet (11) at the end away from the end cap (5), and the liquid inlet (11) and the outer shell (1) are integrally formed. The liquid inlet (11) and the outer shell (1) are arranged on the same axis and are connected to the settling tank provided inside the outer shell (1). The outer diameter of the liquid inlet (11) is smaller than the inner diameter of the outer shell (1), and the inner diameter of the liquid inlet (11) is smaller than the inner diameter of the circle formed by the centers of the multiple guide holes (21).

4. The pressure sensor with a water hammer protection function according to claim 3, characterized in that: The core (3) is electrically connected to an external wire at its top. The clamping ring (4) is a ring structure with a through hole in its center for the external wire to pass through. The end cap (5) has a wire hole (51) in the middle of its end face for the external wire to pass through. The external wire passes through the through hole of the clamping ring (4) and the wire hole (51) of the end cap (5) in sequence, and the space between the external wire and the wire hole (51) of the end cap (5) is filled with sealant.

5. The pressure sensor with a water hammer protection function according to claim 4, characterized in that: The clamping ring (4) is pressed against the top of the core (3) near the outer peripheral wall, and the outer diameter of the clamping ring (4) is adapted to the inner diameter of the outer shell (1). The clamping ring (4) is made of polytetrafluoroethylene.

6. The pressure sensor with a water hammer protection function according to claim 5, characterized in that: The outer peripheral wall of the end cap (5) is provided with an annular groove (52) in the circumferential direction near the end face, and a sealing ring is embedded in the annular groove (52).

7. The pressure sensor with a water hammer protection function according to claim 6, characterized in that: The end cap (5) is also provided with two sets of interconnected vent holes (53) and side holes (54). The vent holes (53) penetrate the upper and lower surfaces of the end cap (5) along the axial direction, and the vent holes (53) and the wire holes (51) are not interconnected. The side holes (54) are opened in the annular groove (52) along the radial direction.

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