Flat embedded diaphragm type pressure sensor
By designing multiple measurement modules and limit block structures in the flat membrane pressure sensor, the problem of easy damage to the diaphragm under high pressure conditions is solved, and accurate measurement of low-pressure and high-pressure liquids and protection of the diaphragm are achieved.
Patent Information
- Application Number
- CN202411814637.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-05-30
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
When measuring liquid pressure sensors, the diaphragm is easily damaged due to the floating and impact of the liquid pressure, especially in high-pressure liquids, the diaphragm is easily exceeded by the upper measurement limit, resulting in damage.
A flat-embedded diaphragm pressure sensor is designed, using a combination of multiple measurement modules. Each measurement module uses a thin diaphragm to limit the maximum deformation volume of the diaphragm through the limiting block and spring structure to prevent excessive deformation and damage.
Accurate measurement of low-pressure and high-pressure liquids is achieved, preventing excessive deformation and damage of the diaphragm under high-pressure conditions, and extending the service life of the sensor.
Smart Images
Figure CN120063568A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of sensors, and in particular to a flush diaphragm pressure sensor. Background Art
[0002] During the use of a flat diaphragm pressure sensor, the liquid will continuously wash the diaphragm, and the diaphragm will deform with the fluctuation of the liquid pressure. Since the diaphragm will be impacted by the liquid to varying degrees, the pressure value of the liquid can be measured according to the change in the resistance value. The diaphragm is the core component in the flat diaphragm pressure sensor; the thickness of the diaphragm is related to the accuracy of measuring the liquid pressure, that is, the thickness of the diaphragm needs to be thin, and the measurement accuracy for low-pressure liquids is high, but for high-pressure liquids, the diaphragm is easily beyond the measurement upper limit, resulting in diaphragm damage, especially when the liquid pressure suddenly increases (water hammer); conversely, the thickness of the diaphragm needs to be thick, which can measure high-pressure liquids (the measurement upper limit of the diaphragm is high), but the measurement accuracy for low-pressure liquids is low; thus, there is a contradiction; therefore, a pressure sensor that solves the above contradiction is needed, and the diaphragm is protected when it exceeds the measurement upper limit to prevent the diaphragm from being damaged. Summary of the Invention
[0003] Therefore, the present invention is made in view of the above problems. The purpose of the present invention is a flush diaphragm pressure sensor. A diaphragm with a thin thickness is used in the pressure measurement module. By combining multiple pressure measurement modules, it can accurately measure low-pressure liquids and measure high-pressure liquids, and prevent the diaphragm from being damaged due to excessive deformation; the present invention realizes the above purpose through the following technical solutions:
[0004] A flush diaphragm pressure sensor includes: a measurement module, a housing, a spring, a limit rod, and a signal processor;
[0005] The number of measurement modules is three, and the three measurement modules are arranged in a straight line in the housing; a signal processor is arranged in the housing; the three measurement modules are respectively a first measurement module, a second measurement module, and a third measurement module, and the first measurement module and the second measurement module are slidably arranged;
[0006] The measurement module includes: an inner housing, a diaphragm, and a limit block. The diaphragm is arranged in the inner housing, and the thickness of the diaphragm is thin; the limit block is fixed between the end face of the inner housing and the diaphragm. The inner housings of the three measurement modules are nested with each other, and a first sealing ring is arranged at the nesting position of the two inner housings; silicone oil is filled in the inner housings of the second measurement module and the third measurement module, and springs are respectively arranged;
[0007] The limiting rod includes a first rod, a second rod, and a third rod nested with each other. The first rod and the third rod are fixedly connected to the inner shells of the first measurement module and the third measurement module respectively, and the second rod is rotatably connected to the inner shell of the second measurement module. A rubber pad is provided at the rotational connection between the second rod and the inner shell of the second measurement module. One ends of the first rod and the second rod are respectively provided with a first slider and a second slider, and the inner walls of the second rod and the third rod are respectively provided with a first chute and a second chute. The first measurement module and the second measurement module slide one by one through the first slider, the second slider, the first chute, and the second chute.
[0008] Preferably, the first chute is formed by connecting the first groove and the second groove end to end. The second groove is inclined, and the first slider is initially located at the end of the first groove. The second chute is formed by connecting the third groove and the fourth groove end to end. The third groove and the fourth groove form a ninety-degree angle, and initially, the second chute is located within the third groove.
[0009] Preferably, the first chute is composed of a first groove, a second groove, and a fifth groove. The two ends of the first groove are respectively connected to the second groove and the fifth groove. The fifth groove forms a ninety-degree angle with the first groove. The second groove and the fifth groove are located on both sides of the first chute. The number of the second measurement modules is multiple, and the number of the second rods is multiple. The connection mode between the first slider on the two second rods and the first chute is that the first slider is located within the fifth groove.
[0010] Advantages of the present invention:
[0011] Multiple measurement modules of the present invention are stacked for use. On the one hand, it can accurately measure low-pressure liquids and can also measure high-pressure liquids. And the present invention can limit the maximum deformation volume of the diaphragm to prevent the diaphragm from being damaged. Description of the Drawings
[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention.
[0013] Figure 2 It is a schematic diagram of the structure of the pressure measurement module of the present invention.
[0014] Figure 3 It is a schematic diagram of the structure of the limiting rod of the present invention.
[0015] Figure 4 It is a schematic diagram of the structures of the first chute and the second chute of the present invention.
[0016] Figure 5 It is a schematic diagram of the movement of the pressure measurement module of the present invention.
[0017] Figure 6 It is a schematic diagram of the movement of the first slider and the second slider of the present invention.
[0018] Figure 7 It is a schematic diagram of the structure of the first chute of the present invention. Detailed Embodiments
[0019] Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those of ordinary skill in the art in the field to which the invention pertains can easily implement these embodiments. However, the present invention can be implemented in various different forms, so the present invention is not limited to the embodiments described below. In addition, in order to more clearly describe the present invention, components not connected to the invention will be omitted from the drawings.
[0020] As Figure 1 shown, a flush diaphragm pressure sensor includes: a measurement module 100, a housing 2, a spring 3, a limit rod 4, and a signal processor 5;
[0021] The number of the measurement modules 100 is multiple, and the multiple measurement modules 100 are stacked one by one upward. The measurement module 100 measures the liquid pressure within a certain pressure value, and the combined use of the multiple measurement modules 100 increases the upper limit of the pressure value measurement. For example, the number of the measurement modules 100 is three, and the three measurement modules 100 are respectively a first measurement module 1-1, a second measurement module 1-2, and a third measurement module 1-3;
[0022] The end of the housing 2 is connected to the pipeline 6 through threads. The cavity of the housing 2 is divided into a high-pressure cavity and a low-pressure cavity. The first measurement module 1-1, the second measurement module 1-2, and the third measurement module 1-3 are located in the high-pressure cavity, and the signal processor 5 is located in the low-pressure cavity. The low-pressure cavity is communicated with the outside of the housing 2. The first measurement module 1-1 is communicated with the high-pressure cavity, and the end of the third measurement module 1-3 is communicated with the low-pressure cavity; the first measurement module 1-1, the second measurement module 1-2, and the third measurement module 1-3 are arranged in the housing 2 in sequence from bottom to top. The first measurement module 1-1 and the second measurement module 1-2 are slidably arranged, and the third measurement module 1-3 is fixed to the housing 2;
[0023] As Figure 2As shown in the figure, the measurement module 100 includes: an inner shell 10, a diaphragm 11, and a limit block 12. A diaphragm 11 is arranged inside the inner shell 10. The diaphragm 11 has a thin thickness and can accurately measure low-pressure liquid. The diaphragm 11 is connected to a terminal block 51 through a cable 13 to connect to a signal processor 5. The limit block 12 is fixed between the end face of the inner shell 10 and the diaphragm 11. Initially, there is a certain distance between the limit block 12 and the diaphragm 11. Its function is to limit the maximum deformation volume of the diaphragm 11 and prevent the diaphragm 11 from being damaged after excessive deformation. The surface of the limit block 12 facing the diaphragm 11 is an arc surface, which fits with the diaphragm 11 after the diaphragm 11 deforms a certain volume. The inner shell 10 of the first measurement module 1-1 is communicated with a pipeline 6, and liquid enters the inner shell 10 of the first measurement module 1-1 to apply pressure to the diaphragm 11. The inner shell 10 of the second measurement module 1-2 nests the inner shell 10 of the first measurement module 1-1, and the inner shell 10 of the third measurement module 1-3 nests the inner shell 10 of the second measurement module 1-2. A first sealing ring 14 is arranged at the nesting part of the two inner shells 10. The second measurement module 1-2 and the third measurement module 1-3 are filled with silicone oil, and springs 3 are respectively arranged in the second measurement module 1-2 and the third measurement module 1-3.
[0024] As Figure 3 shown, the limit rod 4 includes: a rod one 41, a rod two 42, and a rod three 43 nested with each other. A second sealing ring 40 is arranged at the nesting part of the rod one 41, the rod two 42, and the rod three 43 to prevent silicone oil from flowing into the low-pressure cavity of the outer shell 2 along the limit rod 4. The rod one 41 is fixedly connected to the inner shell 10 of the first measurement module 1-1. The rod two 42 is rotatably connected to the inner shell 10 of the second measurement module 1-2. The rod two 42 is fixedly connected to the inner shell 10 of the third measurement module 1-3. A rubber pad 422 is arranged at the rotatable connection part of the rod two 42 and the inner shell 10 of the second measurement module 1-2 to prevent the silicone oil in the second measurement module 1-2 from entering the third measurement module 1-3. A plurality of the cables 13 are inserted into the limit rod 4 and connected to the terminal block 51. One end parts of the rod one 41 and the rod two 42 are respectively provided with a slider one 411 and a slider two 421. Chutes one 420 and chutes two 430 are respectively arranged on the inner walls of the rod two 42 and the rod three 43. The first measurement module 1-1 and the second measurement module 1-2 slide one by one through the slider one 411, the slider two 421, the chute one 420, and the chute two 430.
[0025] As Figure 4As shown in A and B, the first chute 420 is composed of a first groove 4201 and a second groove 4202 which are connected end to end. The second groove 4202 is inclined. The first slider 411 is initially located at the end of the first groove 4201. The second chute 430 is composed of a third groove 4301 and a fourth groove 4302 which are connected end to end. The third groove 4301 and the fourth groove 4302 form a 90-degree angle. Initially, the second chute 430 is located within the third groove 4301.
[0026] Working principle of the present invention:
[0027] When measuring the liquid pressure, the liquid in the pipeline 6 enters the inner shell 10 of the first measurement module 1-1. The pressure value of the liquid is measured by the diaphragm 11 in the first measurement module 1-1. The diaphragm 11 can accurately measure the liquid at low pressure. When the liquid pressure increases, the diaphragm 11 in the first measurement module 1-1 deforms to the maximum volume. As Figure 5 shown, the first measurement module 1-1 moves towards the second measurement module 1-2. The space of the inner shell 10 in the second measurement module 1-2 decreases. Through the action of silicone oil on the diaphragm 11 in the second measurement module 1-2, the signal processor 5 combines the resistance values of the two diaphragms 11 in the first measurement module 1-1 and the second measurement module 1-2 through an internal algorithm to obtain the liquid pressure value at this time. The first rod 41 rises with the first measurement module 1-1. As Figure 6 shown in A, when the first slider 411 in the first rod 41 moves to the end of the second groove 4202, it drives the second rod 42 to rotate. Thus, the second slider 421 in the second rod 42 moves to the connection point of the third groove 4301 and the fourth groove 4302 to unlock the second measurement module 1-2. When the liquid pressure further increases, the first measurement module 1-1 and the second measurement module 1-2 rise synchronously. At this time, the two diaphragms 11 in the first measurement module 1-1 and the second measurement module 1-2 deform to the maximum volume. The space of the inner shell 10 in the third measurement module 1-3 decreases. Through the action of silicone oil on the diaphragm 11 in the third measurement module 1-3, the signal processor 5 combines the resistance values of the three diaphragms 11 in the first measurement module 1-1, the second measurement module 1-2, and the third measurement module 1-3 through an internal algorithm to obtain the liquid pressure value at this time.
[0028] When the liquid pressure decreases, the second measurement module 1-2 is separated from the third measurement module 1-3. As Figure 6As shown in B, at this time, the second slider 421 moves along the fourth groove 4302 towards the third groove 4301. Since the second slider 421 is within the fourth groove 4302, it is limited horizontally, so that the first slider 411 cannot drive the second rod 42 to rotate through the second groove 4202, that is, the first measurement module 1-1 and the second measurement module 1-2 cannot be separated at this time. When the liquid pressure further decreases, the second slider 421 is located at the connection of the fourth groove 4302 and the third groove 4301, and the second measurement module 1-2 is fully reset, and the first measurement module 1-1 and the second measurement module 1-2 are separated. Its function is to make the first measurement module 1-1 and the second measurement module 1-2 move one by one.
[0029] Further, as Figure 7 shown, the first chute 420 is composed of a first groove 4201, a second groove 4202, and a fifth groove 4203. The two ends of the first groove 4201 are respectively connected to the second groove 4202 and the fifth groove 4203. The fifth groove 4203 forms a ninety-degree angle with the first groove 4201. The second groove 4202 and the fifth groove 4203 are located on both sides of the first chute 420. The number of the second measurement modules 1-2 is multiple, and the number of the second rods 42 is multiple. The connection mode between the first slider 421 and the first chute 420 in the two second rods 42 is that the first slider 421 is located within the fifth groove 4203 to make the multiple second measurement modules 1-2 move one by one. Its purpose is to further increase the number of the measurement modules 100, thereby increasing the upper limit of measuring the liquid pressure.
Claims
1. A flat-embedded diaphragm pressure sensor, comprising: A measuring module (100), a housing (2), a spring (3), a limit rod (4), and a signal processor (5); characterized in that: the number of the measuring modules (100) is three, and the three measuring modules (100) are arranged in a straight line in the housing (2); the signal processor (5) is arranged in the housing (2); the three measuring modules (100) are respectively a first measuring module (1-1), a second measuring module (1-2), and a third measuring module (1-3); the first measuring module (1-1) and the second measuring module (1-2) are slidably arranged; the measuring modules (100) comprises: an inner shell (10), a diaphragm (11), and a limit block (12); the diaphragm (11) is arranged inside the inner shell (10), and the thickness of the diaphragm (11) is thin; the limit block (12) is fixed between the end surface of the inner shell (10) and the diaphragm (11); the inner shells (10) of the three measuring modules (100) are nested with each other, and a sealing ring (14) is arranged at the nesting position of two of the inner shells (10); the inner shells (10) of the second measuring module (1-2) and the third measuring module (1-3) are filled with silicone oil, and springs (3) are respectively arranged; The limiting rod (4) comprises: a rod 1 (41), a rod 2 (42), and a rod 3 (43) which are nested with each other; the rod 1 (41) and the rod 3 (43) are fixedly connected to the inner shells (10) of the first measuring module (1-1) and the third measuring module (1-3); the rod 2 (42) is rotatably connected to the inner shell (10) of the second measuring module (1-2); and a rotationally connected portion between the rod 2 (42) and the inner shell (10) of the second measuring module (1-2) is provided with A rubber pad (422); a slider (411) and a slider (421) are respectively arranged at one end of the rod (41) and the rod (42); a slide groove (420) and a slide groove (430) are respectively opened on the inner wall of the rod (42) and the rod (43); the first measuring module (1-1) and the second measuring module (1-2) are slid one by one through the slider (411), the slider (421) and the slide groove (420) and the slide groove (430).
2. The flat-embedded diaphragm pressure sensor according to claim 1, characterized in that: The slide groove 1 (420) is composed of a groove 1 (4201) and a groove 2 (4202) connected end to end, the groove 2 (4202) is inclined, and the slider 1 (411) is initially located at the end of the groove 1 (4201); the slide groove 2 (430) is composed of a groove 3 (4301) and a groove 4 (4302) connected end to end, the groove 3 (4301) and the groove 4 (4302) form an angle of ninety degrees, and the initial slide groove 2 (430) is located in the groove 3 (4301).
3. The flat-embedded diaphragm pressure sensor according to claim 1, characterized in that: The slide groove one (420) is composed of groove one (4201), groove two (4202), and groove five (4203). The two ends of the groove one (4201) are respectively connected to groove two (4202) and groove five (4203). The groove five (4203) and the groove one (4201) form an angle of ninety degrees. The groove two (4202) and the groove five (4203) are located on both sides of the slide groove one (420). The number of the second measuring modules (1-2) is multiple, the number of the rod two (42) is multiple, and the connection method between the slider one (421) in the two rods two (42) and the slide groove one (420) is that the slider one (421) is located in the groove five (4203).