An IO-Link differential pressure transmitter

Abstract

The present invention relates to the technical field of differential pressure sensors, and in particular to an IO-Link differential pressure transmitter, comprising: a measuring module symmetrically provided with a plurality of liquid inlets and a measuring cavity provided inside the measuring module, wherein the measuring cavity is connected to the liquid inlet through a liquid guide port; a measuring assembly is provided inside the measuring cavity, wherein the measuring assembly comprises an isolation membrane, and an extrusion ring is provided on the side of the isolation membrane close to the liquid guide port, wherein the extrusion ring is connected to the isolation membrane and is clamped inside the liquid guide port; a sealing assembly is provided at one end of the liquid guide port close to the liquid inlet, wherein the sealing assembly comprises a sealing ring, a sealing plate and a sealing cover, wherein the sealing ring is provided at one end of the liquid guide port close to the liquid inlet, wherein the sealing plate is sealingly and slidingly provided inside the liquid guide port, and the sealing cover is an annular cover, wherein the two ends are fixedly connected to the sealing ring and the sealing plate respectively. The present invention reduces the impact wear on the isolation membrane during the introduction process, thereby improving the service life of the isolation membrane.

Description

Technical Field

[0001] The present invention relates to the technical field of differential pressure sensors, and in particular to an IO-Link differential pressure transmitter. Background Art

[0002] Transmitters are developed from sensors. Transmitters are sensors that can output standard signals. They work based on the principle of negative feedback. During the measurement and adjustment process, they convert various measured process parameters such as temperature, pressure and other physical quantities into unified standard signals and then display them numerically.

[0003] Chinese patent CN110595673A discloses a differential pressure transmitter, including a transmitter housing, a circuit board, a signal output terminal, a display screen and a pressure-sensitive diaphragm. The differential pressure transmitter is provided with a water-permeable protective plate on the outside of the pressure-sensitive diaphragm to avoid impact damage to the pressure-sensitive diaphragm caused by ejection of pipeline sediments, thereby increasing its service life. At the same time, an annular waterproof plug is provided to effectively avoid leakage of liquid in the pressure-sensitive cavity and affect the measurement results.

[0004] However, when measuring pressure through a water-permeable protective plate, part of the force will disappear, affecting the monitoring effect. At the same time, patent CN109900415A mentions that the use of isolation diaphragms and silicone oil can play a good role in protection and force conduction.

[0005] In the actual measurement process, the isolation diaphragm at the contact point will be impacted due to the squeezing of the measuring liquid. Long-term impact wear can easily cause damage to the isolation diaphragm, thereby reducing the service life of the transmitter. Summary of the invention

[0006] The purpose of the present invention is to solve the disadvantages in the prior art that the isolation diaphragm at the contact point position is easily damaged due to impact and long-term impact wear, and to propose an IO-Link differential pressure transmitter.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] An IO-Link differential pressure transmitter comprises: a measuring module symmetrically provided with a plurality of liquid inlets and a measuring cavity provided inside the measuring module, wherein the measuring cavity is connected with the liquid inlet through a liquid guide port;

[0009] A measuring assembly is arranged inside the measuring cavity, and the measuring assembly includes an isolation membrane, and a squeezing ring is arranged on a side of the isolation membrane close to the liquid guide port, the squeezing ring is communicated with the isolation membrane, and is clamped inside the liquid guide port;

[0010] A sealing assembly is provided at one end of the liquid guiding port close to the liquid inlet, and the sealing assembly includes a sealing ring, a sealing plate and a sealing cover. The sealing ring is provided at one end of the liquid guiding port close to the liquid inlet, and the sealing plate is sealingly and slidably provided inside the liquid guiding port. The sealing cover is an annular cover, and its two ends are respectively fixedly connected to the sealing ring and the sealing plate to form a truncated cone-shaped space, and the truncated cone-shaped space has a larger opening on the side close to the sealing ring.

[0011] Preferably, the measuring cavity is a spherical cavity, the isolation membrane is a hemispherical membrane that fits the measuring cavity, and the two isolation membranes are symmetrically arranged inside the measuring cavity.

[0012] Preferably, a dispersion block is provided in the middle of one side of the extrusion ring away from the sealing plate, and the dispersion block is cylindrical, and the tip is rounded.

[0013] Preferably, the measuring component further comprises a pressure-sensitive diaphragm and a receiver, a mounting groove is opened in the middle of the measuring cavity, the pressure-sensitive diaphragm is arranged inside the mounting groove, and forms two hemispherical spaces with the isolation diaphragms on both sides, and the interior of the hemispherical spaces is used to fill with silicone oil.

[0014] Preferably, one end of the liquid guide port close to the liquid inlet is arranged as a bell mouth, and the sealing ring is made of an elastic material and has a trapezoidal cross section, and is clamped inside the bell mouth.

[0015] Preferably, the middle portion of the sealing plate is arranged as a protrusion toward the isolation membrane, the protrusion is an arc-shaped protrusion, and the center thereof is on the same horizontal line as the center of the extrusion ring.

[0016] Preferably, a limiting assembly is provided between the sealing plate and the isolation membrane, and the limiting assembly includes a fixing ring and a limiting sheet, the fixing ring is fixedly connected to one end of the liquid guide port close to the isolation membrane, the extrusion ring is clamped inside the fixing ring, and a plurality of the limiting sheets are annularly fixedly connected to one side of the fixing ring close to the sealing plate.

[0017] Preferably, the plurality of limiting plates are made of elastic material and are arranged obliquely to form a truncated cone shape. When the plurality of limiting plates are squeezed by the sealing plate, they bulge toward the sealing plate and gather to form a sealed space.

[0018] Preferably, an amplifier is provided above the measuring module, the amplifier comprises a connecting line and an outer tube, the outer tube is vertically fixedly connected to the upper end of the measuring module, and the connecting line is fixedly connected to the upper end of the receiver.

[0019] Preferably, a feedback component is arranged above the amplifier, and the feedback component includes a threaded tube, a display module and a communication module. The threaded tube is fixedly connected to the bottom end of the display module and is threadedly connected to the outer tube. The display module is used to display the measured value, and the communication module is arranged on the lower side of the display module.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] In this transformer, the impact surface of the isolation membrane is set as an extrusion ring, so that the force point is changed from a single point to multiple points, which quickly disperses the impact force and improves the measurement speed. At the same time, the impact wear on the isolation membrane during the introduction process is reduced, thereby increasing the service life of the isolation membrane;

[0022] Since the liquid cannot impact the extrusion ring at the same time when it is introduced, it is easy to cause force dispersion. When the liquid is introduced, the truncated cone space formed in the middle of the sealing component is used to guide the introduced liquid so that the impact point of the liquid is located at the center of the sealing plate, thereby ensuring that the sealing plate evenly squeezes the extrusion ring when it moves, ensuring even dispersion of the impact force;

[0023] The sealing cover, the sealing ring and the sealing plate form a truncated cone-shaped space, so that there is an extension space between the truncated cone-shaped space and the inner wall of the liquid guide port. When too much liquid is introduced into the liquid guide port, the elastic sealing ring will expand into the extension space, so that both sides of the sealing ring will be stretched toward the middle of the sealing ring. Since one end of the sealing ring is fixed, when the sealing cover is deformed, the sealing plate is pulled outward, which increases the force on the sealing plate. While ensuring the normal measurement of the liquid, the threshold value exceeding the measurement limit is increased, which protects the transmitter.

[0024] By setting the end of the liquid guide port as a bell mouth and setting the interior of the sealing component as a truncated cone-shaped space, an overall tilt angle is formed, so that impurities entering the interior of the liquid guide port can be quickly transferred to avoid accumulation of impurities inside the liquid guide port, thereby reducing the impact wear caused by impurities during measurement;

[0025] The arc-shaped protrusion forms an arc-shaped impact groove on the inner side of the sealing plate. The impact groove can effectively disperse the impact force, reducing the impact force on the sealing plate itself. The arc-shaped groove edge also avoids the accumulation of impurities and ensures the normal discharge of impurities.

[0026] When the pressure of the introduced liquid is too high, the sealing plate moves quickly inside the liquid guide port. When it approaches the isolation membrane, it will first contact the elastic limiting plate arranged near the isolation membrane. The inclined limiting plate will first support the sealing plate, thereby increasing the force threshold of the sealing component. When the pressure exceeds the threshold of the sealing component and the limiting component as a whole, multiple limiting plates gathered inwards, while providing maximum support to the sealing plate, form a seal for the liquid guide port, seal the liquid guide port at the moment of liquid impact, and separate the liquid from the isolation membrane, playing an instantaneous protective role, avoiding the situation where the transmitter parts are damaged when the pressure is unknown;

[0027] Due to the different types of measured liquids, some of the measured liquids contain impurities. When measuring, the impurities in the liquid containing impurities will impact the isolation membrane, thereby increasing the wear rate of the isolation membrane. In the process of measurement, some impurities will remain inside the liquid guide port due to their own weight. When measurements are performed multiple times, the isolation membrane will be impacted and worn multiple times under the drive of the liquid, reducing the normal service life of the isolation membrane. By setting the end of the liquid guide port as a bell mouth and setting the interior of the sealing component as a truncated cone-shaped space, an overall tilt angle is formed, which can quickly transfer the impurities entering the liquid guide port to avoid the accumulation of impurities inside the liquid guide port, thereby reducing the impact wear caused by impurities during measurement.

[0028] When the communication module transmits signals, it communicates through the IO-Link protocol. IO-Link is a point-to-point communication interface. IO-Link is a point-to-point serial digital communication protocol. The sensor adopts a simple and unified wiring method, and the interfaces used are very few. The interfaces are unified. IO-Link devices and sensors without IO-Link on the IO-Link master station can be combined arbitrarily, which is convenient for replacement and easy for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the front structure of an IO-Link differential pressure transmitter proposed by the present invention;

[0030] Figure 2 A schematic diagram of the side structure of an IO-Link differential pressure transmitter proposed by the present invention;

[0031] Figure 3 A cross-sectional view of an IO-Link differential pressure transmitter proposed by the present invention;

[0032] Figure 4 A schematic diagram of the structure of a measurement module of an IO-Link differential pressure transmitter proposed by the present invention;

[0033] Figure 5 A schematic diagram of the measurement cavity structure of an IO-Link differential pressure transmitter proposed by the present invention;

[0034] Figure 6 This is a schematic diagram of the front structure of an isolation diaphragm of an IO-Link differential pressure transmitter proposed by the present invention;

[0035] Figure 7 A schematic diagram of the back structure of an isolation membrane of an IO-Link differential pressure transmitter proposed by the present invention;

[0036] Figure 8 A schematic diagram of the sealing assembly structure of an IO-Link differential pressure transmitter proposed by the present invention;

[0037] Fig. 9 A schematic diagram of the structure of a limiting component of an IO-Link differential pressure transmitter proposed by the present invention;

[0038] Fig.10 A schematic cross-sectional view of a limiting component of an IO-Link differential pressure transmitter proposed by the present invention;

[0039] Fig.11 This is a schematic diagram of the feedback component structure of an IO-Link differential pressure transmitter proposed by the present invention.

[0040] In the figure: 1 measuring module, 2 measuring cavity, 3 liquid guide port, 4 measuring component, 41 isolation membrane, 42 pressure-sensitive diaphragm, 43 receiver, 5 sealing component, 51 sealing ring, 52 sealing plate, 53 sealing cover, 6 dispersion block, 7 limiting component, 71 fixing ring, 72 limiting plate, 8 amplifier, 81 connecting line, 82 outer tube, 9 feedback component, 91 threaded tube, 92 display module, 93 communication module, 10 protrusion, 11 extrusion ring. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0042] The terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present invention are only for the convenience of description and are not used to limit the scope of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of the present invention without substantially changing the technical content.

[0043] Reference Figure 1-Figure 11 , an IO-Link differential pressure transmitter, comprising: a measuring module 1 symmetrically provided with a plurality of liquid inlets and a measuring cavity 2 provided inside the measuring module 1, wherein the measuring cavity 2 is connected with the liquid inlet through a liquid guide port 3;

[0044] A measuring assembly 4 is arranged inside the measuring cavity 2. The measuring assembly 4 includes an isolation membrane 41. A squeezing ring 11 is arranged on one side of the isolation membrane 41 close to the liquid guide port 3. The squeezing ring 11 is connected to the isolation membrane 41 and is clamped inside the liquid guide port 3.

[0045] A sealing assembly 5 is provided at one end of the liquid guiding port 3 close to the liquid inlet, and the sealing assembly 5 includes a sealing ring 51, a sealing plate 52 and a sealing cover 53. The sealing ring 51 is provided at one end of the liquid guiding port 3 close to the liquid inlet, the sealing plate 52 is sealingly slidably provided inside the liquid guiding port 3, and the sealing cover 53 is an annular cover, and its two ends are respectively fixedly connected to the sealing ring 51 and the sealing plate 52 to form a truncated cone-shaped space, and the truncated cone-shaped space has a larger opening on the side close to the sealing ring 51.

[0046] In the embodiment of the above technical solution, since the measured liquid will generate impact force when it is introduced, in order to avoid the impact force generated during the introduction from causing excessive impact on the isolation membrane 41, resulting in damage to the impact point of the isolation membrane 41 and impact on the internal pressure-sensitive diaphragm 42, the impact surface of the isolation membrane 41 is set to the extrusion ring 11, thereby facilitating the change of force from single-point force to multi-point force, quickly dispersing the impact force and improving the measurement speed, while reducing the impact wear on the isolation membrane 41 during the introduction process, thereby improving the service life of the isolation membrane 41;

[0047] However, since the liquid cannot impact the squeeze ring 11 at the same time when it is introduced, it is easy to cause force dispersion. When the liquid is introduced, the truncated cone-shaped space formed in the middle of the sealing component 5 is used to guide the introduced liquid so that the impact point of the liquid is located at the center of the sealing plate 52, thereby ensuring that the sealing plate 52 is uniformly squeezed on the squeeze ring 11 when it moves, thereby ensuring uniform dispersion of the impact force.

[0048] In order to prevent the measured liquid from entering the measuring chamber 2 and corroding the isolation membrane 41, a sealing assembly 5 is provided to seal and protect the liquid guide port 3, and a sealing plate 52 and a sealing cover 53 are used to seal the inside of the liquid guide port 3, thereby preventing the measured liquid from entering and preventing the isolation membrane 41 from being damaged.

[0049] Since the sealing cover 53, the sealing ring 51 and the sealing plate 52 form a truncated cone-shaped space, there is an extension space between the truncated cone-shaped space and the inner wall of the liquid guide port 3. When too much liquid is introduced into the liquid guide port 3, the elastic sealing ring 51 will expand toward the extension space, so that the two sides of the sealing ring 51 are stretched toward the middle of the sealing ring 51. Since one end of the sealing ring 51 is fixed, when the sealing cover 53 is deformed, the sealing plate 52 is pulled outward, thereby increasing the force on the sealing plate 52. While ensuring normal measurement of the liquid, the threshold value exceeding the measurement limit is increased, thereby protecting the transmitter.

[0050] The preferred technical solution in this embodiment is:

[0051] Reference Figure 3 and Figure 5As shown, the measuring cavity 2 is a spherical cavity, and the isolation membrane 41 is a hemispherical membrane that fits the measuring cavity 2. The two isolation membranes 41 are symmetrically arranged inside the measuring cavity 2. When the hemispherical isolation membrane 41 is impacted, the impact force can be effectively dispersed, thereby increasing the force limit of the isolation membrane 41 and ensuring the service life of the isolation membrane 41.

[0052] Reference Figure 7 As shown, a dispersion block 6 is provided in the middle of one side of the extrusion ring 11 away from the sealing plate 52. The dispersion block 6 is cylindrical, and the tip is rounded. The extrusion ring 11 will diffuse the pressure received outward in a ring shape. During the diffusion process, due to the flow of silicone oil, the silicone oil on both sides will move toward the middle, thereby affecting the normal deformation of the isolation diaphragm 41. The dispersion block 6 can effectively disperse the rebound force. During the deformation of the isolation diaphragm 41, the return force received by the middle part is dispersed and reduced, ensuring that the isolation diaphragm 41 can normally receive the pressure when a large pressure is applied.

[0053] Reference Figure 5 As shown, the measuring component 4 also includes a pressure-sensitive diaphragm 42 and a receiver 43. A mounting groove is provided in the middle of the measuring cavity 2. The pressure-sensitive diaphragm 42 is arranged inside the mounting groove and forms two hemispherical spaces with the isolation diaphragms 41 on both sides. The hemispherical spaces are filled with silicone oil. The silicone oil is characterized by small deformation under pressure and can perfectly transmit the pressure deformation amount.

[0054] During the measurement process, when the pressures on both sides are different, the isolation diaphragm 41 on the side with greater pressure is subjected to greater force, thereby squeezing the isolation diaphragm 41 on the other side, causing the pressure-sensitive diaphragm 42 to deform, thereby generating current, which is received by the receiver 43. The receiver 43 introduces the received current into the amplifier 8 for amplification, and finally the test value can be obtained by calculation according to the magnitude of the current;

[0055] Reference Figure 5 and Figure 8 As shown, one end of the liquid guide port 3 close to the liquid inlet is set as a bell mouth, and the sealing ring 51 is made of elastic material and has a trapezoidal cross section, and is clamped inside the bell mouth;

[0056] Due to the different types of measured liquids, some of the measured liquids contain impurities. When measuring, the impurities in the liquid containing impurities will impact the isolation membrane 41, thereby increasing the wear rate of the isolation membrane 41. In addition, during the measurement process, some impurities will remain inside the liquid guide port 3 due to their own weight. When measurements are performed multiple times, the isolation membrane 41 will be impacted and worn multiple times under the drive of the liquid, which reduces the normal service life of the isolation membrane 41. By setting the end of the liquid guide port 3 as a bell mouth and setting the interior of the sealing component 5 as a truncated cone-shaped space, an overall tilt angle is formed, which can quickly transfer the impurities entering the liquid guide port 3 to avoid the accumulation of impurities inside the liquid guide port 3, thereby reducing the impact wear caused by impurities during measurement.

[0057] The sealing ring 51 with a trapezoidal cross section can be in closer contact with the bell mouth. At the same time, after the liquid enters the sealing cover 53, due to the squeezing effect of the liquid, the sealing ring 51 will strengthen the contact with the bell mouth under the tension of the sealing cover 53, thereby improving the sealing performance and avoiding the formation of a gap between the sealing ring 51 and the bell mouth.

[0058] Reference Figure 3 , Fig. 9 and Fig.10 As shown, the middle part of the sealing plate 52 is provided with a protrusion 10 facing the isolation membrane 41, and the protrusion 10 is an arc-shaped protrusion 10, and the center is on the same horizontal line as the center of the extrusion ring 11; the arc-shaped protrusion 10 forms an arc-shaped impact groove on the inner side of the sealing plate 52, and the impact groove can effectively disperse the impact force received, thereby reducing the impact force on the sealing plate 52 itself, and the arc-shaped groove edge also avoids the accumulation of impurities, thereby ensuring the normal extraction of impurities;

[0059] Reference Figure 8 As shown, when the pressure of the measured liquid is too large, it is easy to cause the sealing component 5 to be subjected to excessive impact force, thereby causing the sealing plate 52 to exert excessive force on the isolation membrane 41, causing the isolation membrane 41 to have a pressure exceeding the threshold, resulting in damage to the isolation membrane 41, so it is necessary to set a structure that can increase the threshold and protect the isolation membrane 41 at the same time. A limiting component 7 is arranged between the sealing plate 52 and the isolation membrane 41. The limiting component 7 includes a fixing ring 71 and a limiting sheet 72. The fixing ring 71 is fixedly connected to one end of the liquid guide port 3 close to the isolation membrane 41, and the extrusion ring 11 is clamped inside the fixing ring 71. A plurality of limiting sheets are annularly fixedly connected to one side of the fixing ring 71 close to the sealing plate 52; the plurality of limiting sheets are made of elastic material and are inclined to form a truncated cone. When the plurality of limiting sheets are squeezed by the sealing plate 52, they gather toward the protrusion 10 of the sealing plate 52 to form a sealed space.

[0060] When the pressure of the introduced liquid is too high, the strong driving force will cause the sealing plate 52 to move quickly inside the liquid guide port 3. When it is close to the isolation membrane 41, it will first contact the elastic limiting plate 72 arranged near the isolation membrane 41. The inclined limiting plate 72 will first support the sealing plate 52, thereby increasing the force threshold of the sealing component 5. When the pressure exceeds the threshold of the sealing component 5 and the limiting component 7 as a whole, multiple limiting plates gathered inward will support and contact with the protrusion 10, while providing maximum support to the sealing plate 52, forming a seal for the liquid guide port 3, sealing the liquid guide port 3 at the moment of liquid impact, isolating the liquid and the isolation membrane 41, playing an instantaneous protective role, and avoiding the situation where the transmitter parts are damaged when the pressure is unknown;

[0061] At the same time, when the liquid is introduced, some impurities will remain inside the sealing component 5. In order to ensure the cleaning effect of the impurities, the limiting sheet 72 squeezed and deformed by the sealing plate 52 will elastically push the sealing plate 52 during the liquid discharge and the rebound process of the limiting sheet 72, so that the sealing plate 52 impacts and moves, and elastically pushes the impurities inside the sealing cover 53, so that the impurities are elastically discharged, and the impurities are accelerated. At the same time, the residual impurities in the sealing cover 53 are reduced;

[0062] An amplifier 8 is provided above the measuring module 1. The amplifier 8 includes a connecting line 81 and an outer tube 82. The outer tube 82 is vertically fixedly connected to the upper end of the measuring module 1. The connecting line 81 is fixedly connected to the upper end of the receiver 43.

[0063] Reference Figure 1 , Figure 3 and Fig.11 A feedback assembly 9 is provided above the amplifier 8, and the feedback assembly 9 includes a threaded tube 91, a display module 92 and a communication module 93. The threaded tube 91 is fixedly connected to the bottom end of the display module 92 and is threadedly connected to the outer tube 82. The display module 92 is used to display the measured value. The communication module 93 is provided at the lower side of the display module 92. The threaded tube 91 is used to be threadedly connected to the outer tube 82, so that the amplifier 8 is connected to the feedback assembly 9.

[0064] The measuring module 1 is used to measure the measured variable and convert it into an input signal (voltage, current, displacement, force or torque signal, etc.) that can be received by the amplifier 8. The feedback part converts the output signal of the transmitter into a feedback signal, which is then sent back to the input end, and the algebraic sum of the zeroing signal is compared with the feedback signal. The difference is sent to the amplifier 8 for amplification and converted into a standard output signal. Finally, the measured data is displayed through the display module 92.

[0065] The communication module 93 communicates through the IO-Link protocol when transmitting signals. IO-Link is a digital communication protocol and interface standard used in the field of industrial automation. Its purpose is to perform periodic data exchange between sensors. The sensors use a simple and unified wiring method and use very few interfaces. IO-Link devices and sensors without IO-Link on the IO-Link master station can be combined arbitrarily, which is convenient to replace and easy to maintain.

[0066] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An IO-Link differential pressure transmitter, comprising: A measuring module (1) symmetrically provided with a plurality of liquid inlets and a measuring cavity (2) provided inside the measuring module (1), wherein the measuring cavity (2) is connected to the liquid inlets via a liquid guide port (3); A measuring component (4) is arranged inside the measuring cavity (2), and the measuring component (4) comprises an isolation membrane (41). A squeezing ring (11) is arranged on a side of the isolation membrane (41) close to the liquid guide port (3). The squeezing ring (11) is in communication with the isolation membrane (41) and is clamped inside the liquid guide port (3); A sealing assembly (5) is provided at one end of the liquid guide port (3) close to the liquid inlet, the sealing assembly (5) comprising a sealing ring (51), a sealing plate (52) and a sealing cover (53), the sealing ring (51) being provided at one end of the liquid guide port (3) close to the liquid inlet, the sealing plate (52) being sealingly slidably provided inside the liquid guide port (3), the sealing cover (53) being an annular cover, the two ends of which are respectively fixedly connected to the sealing ring (51) and the sealing plate (52) to form a truncated cone-shaped space, and the truncated cone-shaped space has a larger opening on a side close to the sealing ring (51); A limiting assembly (7) is provided between the sealing plate (52) and the isolation membrane (41), the limiting assembly (7) comprising a fixing ring (71) and a limiting sheet (72), the fixing ring (71) being fixedly connected to one end of the liquid guide port (3) close to the isolation membrane (41), the extrusion ring (11) being clamped inside the fixing ring (71), and a plurality of limiting sheets being annularly fixedly connected to one side of the fixing ring (71) close to the sealing plate (52).

2. The IO-Link differential pressure transmitter according to claim 1, characterized in that: The measuring cavity (2) is a spherical cavity, the isolation membrane (41) is a hemispherical membrane that fits the measuring cavity (2), and the two isolation membranes (41) are symmetrically arranged inside the measuring cavity (2).

3. The IO-Link differential pressure transmitter according to claim 1, characterized in that: A dispersion block (6) is arranged in the middle of one side of the extrusion ring (11) away from the sealing plate (52); the dispersion block (6) is cylindrical and has a rounded tip.

4. The IO-Link differential pressure transmitter according to claim 1, characterized in that: The measuring assembly (4) further comprises a pressure-sensitive diaphragm (42) and a receiver (43). A mounting groove is provided in the middle of the measuring cavity (2). The pressure-sensitive diaphragm (42) is arranged inside the mounting groove and forms two hemispherical spaces with the isolation diaphragms (41) on both sides. The interior of the hemispherical spaces is used to be filled with silicone oil.

5. The IO-Link differential pressure transmitter according to claim 1, characterized in that: One end of the liquid guide port (3) close to the liquid inlet is arranged as a bell mouth, and the sealing ring (51) is made of an elastic material and has a trapezoidal cross section, and is clamped inside the bell mouth.

6. The IO-Link differential pressure transmitter according to claim 1, characterized in that: The middle portion of the sealing plate (52) is provided with a protrusion (10) facing the isolation membrane (41); the protrusion (10) is an arc-shaped protrusion (10), and the center thereof is on the same horizontal line as the center of the extrusion ring (11).

7. An IO-Link differential pressure transmitter according to claim 6, characterized in that: The plurality of limiting sheets (72) are made of an elastic material and are arranged at an angle to form a truncated cone shape. When the plurality of limiting sheets (72) are squeezed by the sealing plate (52), they gather toward the protrusion (10) of the sealing plate (52) to form a sealed space.

8. The IO-Link differential pressure transmitter according to claim 1, characterized in that: An amplifier (8) is provided above the measuring module (1), the amplifier (8) comprising a connecting line (81) and an outer tube (82), the outer tube (82) being vertically fixedly connected to the upper end of the measuring module (1), and the connecting line (81) being fixedly connected to the upper end of the receiver (43).

9. The IO-Link differential pressure transmitter according to claim 8, characterized in that: A feedback component (9) is arranged above the amplifier (8), the feedback component (9) comprising a threaded tube (91), a display module (92) and a communication module (93), the threaded tube (91) being fixedly connected to the bottom end of the display module (92) and being threadedly connected to the outer tube (82), the display module (92) being used to display measured values, and the communication module (93) being arranged at the bottom side of the display module (92).

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