Diaphragm type electronic pressure gauge
By using an insulating cavity and a thermal resistance medium to separate the pressure medium and strain gauge in the diaphragm electronic pressure gauge, combined with the thermal conductivity separation of the hollow pressure transfer tube and the pressure regulation function of the pressure regulating cavity, the problem of reduced diaphragm strain transfer accuracy in low-temperature or high-temperature environments is solved, and higher pressure sensing accuracy and stability are achieved.
Patent Information
- Application Number
- CN202411748639.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-03-14
AI Technical Summary
In the low or high temperature environment, the strain transfer accuracy of the existing diaphragm is reduced, and heat transfer affects the strain gauge data.
A diaphragm electronic pressure gauge is designed, using an insulating chamber and a thermal resistance medium to separate the pressure medium and the strain gauge, and thermal conductivity separation is achieved through a hollow pressure transfer tube, and a pressure regulating valve and exhaust hole are set up in the pressure regulating chamber to buffer and discharge volatile gases and stabilize pressure data.
It effectively reduces the impact of temperature on pressure sensing data, improves the accuracy and stability of pressure sensing, and reduces the possibility of heat deformation of the diaphragm.
Smart Images
Figure CN119618455A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a diaphragm type electronic pressure gauge, belonging to the field of pressure sensors. Background Art
[0002] Existing pressure diaphragm pressure sensors mainly rely on the deformation of the diaphragm, and realize pressure sensing by squeezing the pressure strain device through the pushing part integrally arranged on the diaphragm; however, the heat resistance of the diaphragm is limited. For low-temperature or high-temperature pressure media, the strain transmission accuracy of the diaphragm will be reduced, and the heat of the diaphragm will also be transferred to the strain gauge. Although the resistive strain gauge structure will have a temperature compensation strain gauge to eliminate the influence of temperature, the overall circuit is still sensitive to temperature, which can easily have a significant impact on the strain data. Summary of the invention
[0003] The technical problem to be solved by the present invention is to overcome the technical problems in the prior art and provide a diaphragm type electronic pressure gauge.
[0004] The technical solution adopted by the present invention to solve its technical problem is: A diaphragm type electronic pressure gauge, comprising: The shell has a heat-insulating cavity at the front end, a pressure cavity at the middle, and a pressure-regulating cavity at the end; The heat-insulating chamber and the pressure chamber are separated by a sliding partition; the pressure chamber and the pressure-regulating chamber are separated by a pressure-releasing partition; the heat-insulating chamber and the pressure-regulating chamber are filled with a thermal resistance medium, a pressure connecting pipe for connecting the pressure medium and the pressure chamber is fixed through the middle of the heat-insulating chamber, the front end side wall of the pressure connecting pipe is sealedly connected to the front end of the shell, the end of the pressure connecting pipe is sealedly connected to the sliding partition, and the pressure connecting pipe is connected to the pressure chamber; The pressure sensing assembly includes a pressure separation frame fixed to the inner wall of the shell corresponding to the position of the pressure chamber, a pressure diaphragm is arranged in the middle of the pressure separation frame, the outer ring of the pressure diaphragm is elastically connected to the pressure separation frame through an elastic sealing ring, a floating plate is arranged in the middle of the pressure diaphragm, the pressure diaphragm separates the pressure chamber into a pressure expansion area and a negative pressure support area, and the pressure expansion area is connected to the pressure connecting pipe; a pressure regulating valve is connected to the end of the pressure regulating chamber; A pressure sensing assembly, the pressure sensing assembly comprises a pressure sensing plate arranged in the heat-insulating cavity, the outer ring of the pressure sensing plate is fixed to the inner wall of the heat-insulating cavity through a connecting frame, N pressure transmission tubes are fixed through the inner ring array of the pressure sensing plate, N strain gauges are arranged in a ring array on the pressure sensing plate, the strain gauges are connected to the bridge module through a connecting socket arranged on the inner wall of the heat-insulating cavity, and a floating opening for penetrating the pressure connecting tube is arranged in the middle of the pressure sensing plate; And, a pressure regulating assembly, the pressure regulating assembly is arranged in a pressure regulating partition plate between the pressure regulating chamber and the pressure chamber, the pressure regulating assembly includes an inlet pressure relief valve and an exhaust pressure relief valve arranged in the pressure regulating partition plate, the opening direction of the inlet pressure relief valve is opposite to the opening direction of the exhaust pressure relief valve; the pressure regulating assembly also includes a pressure support groove arranged in the pressure regulating partition plate, the pressure support groove opens toward the negative pressure support area, and an elastic diaphragm is arranged in the opening of the pressure support groove; The middle part of the pressure transmission pipe passes through the sliding partition and extends into the pressure chamber. The side wall of the pressure transmission pipe is slidingly and sealingly connected to the sliding partition. The middle part of the pressure transmission pipe passes through the pressure diaphragm and is vertically fixedly connected to the floating plate.
[0005] As a further improvement of the present invention, the front end portion of the pressure transmission tube is connected to the pressure regulating partition plate by a sliding support mechanism, the sliding support mechanism includes a sliding cavity arranged in the pressure regulating partition plate, the front end of the sliding cavity is provided with a pressure relief hole, the end of the sliding cavity is provided with a drainage hole, a floating block is slidingly sealed and connected in the sliding cavity, an exhaust hole is provided in the middle of the floating block, the front end of the pressure transmission tube is vertically fixed to the floating block, and the middle part of the pressure transmission tube is connected to the exhaust hole; the sliding support mechanism can limit the floating axis of the pressure transmission tube, and reduce the reduction of data accuracy caused by the radial swing of the pressure transmission tube; the drainage hole and the exhaust hole can discharge water vapor infiltrated into the thermal resistance medium and steam evaporated by the thermal resistance medium, and reduce the influence of the internal pressure on the pressure sensing accuracy.
[0006] As a further improvement of the present invention, a plurality of sliding sleeves are arranged in a circular array on the sliding partition, a plurality of sealing rings made of polyformaldehyde are arranged in a linear array on the inner wall of the sliding sleeve, and the pressure transmission tube and the sealing ring are in sliding sealing contact; the sealing ring in the sliding sleeve can improve the sliding sealing effect of the pressure transmission tube, and the polyformaldehyde material has good high temperature resistance, acid and alkali resistance, and longer service life.
[0007] As a further improvement of the present invention, the pressure sensing plate includes a supporting outer frame for being fixedly connected to the inner wall of the shell and a floating plate concentrically arranged in the middle of the supporting outer frame. The pressure transmission tube passes through the outer ring fixed to the floating plate. The floating plate and the supporting outer frame are elastically connected through a plurality of arc-shaped strain plates. An arc-shaped embedding groove is arranged in the middle of the strain plate. The aforementioned strain gauge is fixed in the embedding groove by resin. The mutual floating plates increase the length of the strain gauge and improve the sensitivity of the strain gauge.
[0008] As a further improvement of the present invention, a sealing cover is provided at the front end of the shell, the front end of the pressure connecting pipe passes through and is fixed in the middle of the sealing cover, a terminal block is also fixed on the sealing cover, and the terminal block is connected to the strain gauge through a lead wire; the connecting socket passes through and is fixed to the sealing cover; a filling valve for filling the thermal resistance medium is also provided on the sealing cover; the sealing cover allows the insulation cavity to be opened for maintenance, the terminal block and the lead wire increase the length of the strain circuit, increase the contact area between the strain circuit and the thermal resistance medium, and further reduce the influence of temperature on the resistance.
[0009] As a further improvement of the present invention, a lifting ring is connected between the sealing cover and the shell through a flange, and the outer ring of the connecting frame is fixed to the inner ring of the lifting ring; the lifting ring allows the connecting frame to be easily separated, and the connecting frame can be easily grounded to the outside, thereby reducing the influence of static electricity on the resistive strain gauge.
[0010] As a further improvement of the present invention, the pressure diaphragm is made of rubber material, the floating plate is fixed to the inside of the pressure diaphragm by integral glue injection, and two groups of sealing blocks are symmetrically arranged on the pressure transmission tube. The sealing blocks are arranged on both sides of the pressure transmission tube corresponding to the floating plate, the front end of the sealing blocks is in close contact with the floating plate, the outer ring of the sealing block is bonded and fixed to the pressure diaphragm, and the inner ring of the sealing block is sealed and bonded and fixed to the pressure transmission tube; the floating plate is fixed as a whole, and the bonding strength is higher. The sealing blocks can prevent the pressure medium from directly accessing the floating plate and then invading the inside of the pressure diaphragm, resulting in low pressure transmission efficiency to the pressure diaphragm, affecting the accuracy of pressure sensing.
[0011] As a further improvement of the present invention, an insulating sleeve having a hollow insulating cavity is sleeved on the outer wall of the pressure connecting pipe at a position corresponding to the insulating cavity; the insulating sleeve can reduce the influence of the pressure connecting pipe and the thermal resistance medium.
[0012] As a further improvement of the present invention, a connecting ring is arranged in the middle part of the shell, and the pressure separation frame includes an upper pressure ring and a lower pressure ring, which are fixedly connected by a flange, and the connecting ring is clamped between the outer rings of the upper pressure ring and the lower pressure ring, and the outer ring of the pressure diaphragm is clamped between the inner rings of the upper pressure ring and the lower pressure ring; the outer ring of the pressure regulating separation plate is fixed to the pressure separation frame by a flange; the clamping fixation makes it easier to disassemble and maintain.
[0013] The beneficial effects of the present invention are: 1. The present invention transmits the compressive floating amount of the pressure sensing diaphragm through two groups of hollow pressure transmission tubes, and at the same time immerses the pressure strain gauge in a thermal resistance medium with a large heat capacity. The thermal resistance medium realizes the heat conduction separation of the pressure medium and the resistance strain gauge, thereby reducing the influence of temperature on the accuracy of the pressure sensing data. At the same time, the inside of the hollow pressure transmission tube can realize thermal convection cooling of the pressure transmission tube through thermal temperature difference convection, further reducing the possibility of thermal deformation of the diaphragm itself.
[0014] 2. The pressure regulating chamber at the top can buffer and collect the evaporated liquid, reduce the influence of the volatile gas retained inside the pressure gauge on the accuracy of the pressure gauge data, and at the same time, when the external environment temperature or atmospheric pressure changes, it can also discharge a certain amount of internal air to ensure the stability of the pressure data. In addition, the pressure regulating chamber also serves as the top cavity for the circulating heating of the thermal resistance medium. It can drive the thermal resistance medium cyclically through heat convection, so that the thermal resistance medium with higher temperature rises through the pressure transfer pipe, and the cooled thermal resistance medium sinks, thereby realizing the cyclic heat exchange of the pressure sensing diaphragm and reducing the influence of temperature. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The present invention is further described below in conjunction with the accompanying drawings and embodiments.
[0016] Figure 1 It is a cross-sectional schematic diagram of the present invention; Figure 2 yes Figure 1 A local enlarged schematic diagram of the middle A; Figure 3 is a schematic diagram of the structure of the pressure sensing plate; Figure 4 It is a schematic diagram of the structure of the wiring board.
[0017] In the figure: 1, shell; 2, sealing cover; 3, lifting ring; 4, upper clamping ring; 5, lower clamping ring; 6, pressure sensing plate; 7, strain plate; 8, strain gauge; 9, floating plate; 10, terminal block; 10-1, raised plate; 10-2, plug-in column; 10-3, printed circuit; 11, wire; 12, connecting socket; 13, connecting platform; 14, filling valve; 15, pressure connecting pipe; 16, insulation sleeve; 17, sliding partition; 18, pressure transmission pipe; 19, clamping block; 20, sliding sleeve; 21, sealing ring; 22 , connecting ring; 23, lower pressure ring; 24, upper pressure ring; 25, pressure diaphragm; 26, floating plate; 27, sealing pressure block; 28, pressure relief diaphragm; 29, pressure inlet and pressure relief valve; 30, pressure support groove; 31, elastic diaphragm; 32, pressure discharge and pressure relief valve; 33, end sealing plate; 34, pressure regulating valve; 35, sliding cavity; 36, floating block; 37, pressure relief hole; 38, drainage hole; 39, piston sleeve; 40, piston cover; 41, exhaust hole; 42, flange pressure ring. DETAILED DESCRIPTION
[0018] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.
[0019] like Figure 1 , a diaphragm type electronic pressure gauge, comprising: The shell 1 has a heat-insulating cavity at its front end, a pressure cavity at its middle, and a pressure-regulating cavity at its end.
[0020] like Figure 1 The insulation chamber and the pressure chamber are separated by a sliding partition 17; the pressure chamber and the pressure regulating chamber are separated by a pressure relief partition 28; the insulation chamber and the pressure regulating chamber are filled with thermal resistance medium, and a pressure connecting pipe 15 for connecting the pressure medium and the pressure chamber is fixed through the middle of the insulation chamber, the front end side wall of the pressure connecting pipe 15 is sealed and connected to the front end of the shell 1, the end of the pressure connecting pipe 15 is sealed and connected to the sliding partition 17, the pressure connecting pipe 15 is connected to the pressure chamber, and an insulation sleeve 16 with a hollow insulation chamber is sleeved on the outer wall of the pressure connecting pipe 15 corresponding to the insulation chamber.
[0021] like Figure 1 , pressure sensing component, the pressure sensing component includes a pressure separation frame fixed to the inner wall of the shell 1 at the position of the pressure chamber, a pressure diaphragm 25 is arranged in the middle of the pressure separation frame, and a connecting ring 22 is arranged in the middle of the shell 1, the pressure separation frame includes an upper pressure ring 24 and a lower pressure ring 23, the upper pressure ring 24 and the lower pressure ring 23 are fixedly connected by a flange, the connecting ring 22 is clamped between the outer rings of the upper pressure ring 24 and the lower pressure ring 23, and the outer ring of the pressure diaphragm 25 is clamped between the inner rings of the upper pressure ring 24 and the lower pressure ring 23; the outer ring of the pressure regulating separation plate is fixed to the pressure separation frame through a flange; the outer ring of the pressure diaphragm 25 is elastically connected to the pressure separation frame through an elastic sealing ring 21, a floating plate 26 is arranged in the middle of the pressure diaphragm 25, the pressure diaphragm 25 separates the pressure chamber into a pressure expansion zone and a negative pressure support zone, and the pressure expansion zone is connected to the pressure connecting pipe 15; an end sealing plate 33 is connected to the end of the pressure regulating chamber through a flange, and a pressure regulating valve 34 is connected to the middle of the end sealing plate 33.
[0022] like Figure 1, a pressure sensing component, the pressure sensing component includes a pressure sensing plate 6 arranged in the insulation cavity, the outer ring of the pressure sensing plate 6 is fixed to the inner wall of the insulation cavity through a connecting frame, a lifting ring 3 is connected between the sealing cover 2 and the shell 1 through a flange, and a lifting ring 3 is connected to the lifting ring 3 through a flange, the connecting frame includes an upper clamping ring 4 and a lower clamping ring 5, the outer ring of the connecting frame is fixed by clamping between the upper clamping ring 4 and the lower clamping ring 5, N pressure transmission pipes 18 are fixed through the inner ring annular array of the pressure sensing plate 6, N strain gauges 8 are arranged in an annular array on the pressure sensing plate 6, the strain gauges 8 are connected to the bridge module through a connecting socket 12 arranged on the inner wall of the insulation cavity, and a floating opening for penetrating the pressure connecting pipe 15 is provided in the middle of the pressure sensing plate 6; Figure 3 The pressure sensing plate 6 includes a supporting outer frame for being fixedly connected to the inner wall of the shell 1 and a floating plate 9 concentrically arranged in the middle of the supporting outer frame. The pressure transmission tube 18 passes through the outer ring fixed to the floating plate 9. Clamping blocks 19 are arranged on both sides of the floating plate 9. The pressure transmission tube 18 passes through the clamping blocks 19 to realize the vertical fixed connection of the pressure transmission tube 18 relative to the floating plate 9. The floating plate 9 and the supporting outer frame are elastically connected through a plurality of arc-shaped strain plates 7. An arc-shaped embedding groove is arranged in the middle of the strain plate 7. The aforementioned strain gauge 8 is fixed to the embedding groove by resin.
[0023] like Figure 1 , and, a pressure regulating component, the pressure regulating component is arranged in the pressure regulating partition plate between the pressure regulating chamber and the pressure chamber, the pressure regulating component includes an inlet pressure relief valve 29 and an exhaust pressure relief valve 32 arranged in the pressure regulating partition plate, the opening direction of the inlet pressure relief valve 29 is opposite to the opening direction of the exhaust pressure relief valve 32; the pressure regulating component also includes a pressure support groove 30 arranged in the pressure regulating partition plate, the pressure support groove 30 opens toward the negative pressure support area, and an elastic diaphragm 31 is fixed at the opening of the pressure support groove 30 through a flange pressure ring 42.
[0024] like Figure 1 The middle part of the pressure transmission tube 18 passes through the sliding partition 17 and extends into the pressure chamber. The side wall of the pressure transmission tube 18 is connected to the sliding partition 17 in a sliding and sealing manner. A plurality of sliding sleeves 20 are arranged in an annular array on the sliding partition 17. A plurality of sealing rings 21 made of polyoxymethylene are arranged in a linear array on the inner wall of the sliding sleeve 20. The pressure transmission tube 18 and the sealing ring 21 are in sliding and sealing contact with each other.
[0025] like Figure 1The middle part of the pressure transmission tube 18 passes through the pressure diaphragm 25 and the floating plate 26 and is vertically fixedly connected by a sealing block 27. The pressure diaphragm 25 is made of rubber. The floating plate 26 is fixed inside the pressure diaphragm 25 by integral glue injection. Two groups of sealing blocks 27 are symmetrically arranged on the pressure transmission tube 18. The sealing blocks 27 are arranged on both sides of the pressure transmission tube 18 corresponding to the floating plate 26. The front end of the sealing block 27 is in close contact with the floating plate 26. The outer ring of the sealing block is bonded and fixed to the pressure diaphragm 25, and the inner ring of the sealing block is sealed and bonded and fixed to the pressure transmission tube 18.
[0026] like Figure 2 , wherein the front end of the pressure transmission tube 18 is connected to the pressure regulating partition plate through a sliding support mechanism, the sliding support mechanism includes a sliding chamber 35 arranged in the pressure regulating partition plate, a piston sleeve 39 is arranged at the front end of the sliding chamber 35, the piston sleeve 39 and the pressure transmission tube 18 are slidingly and sealedly connected, a pressure relief hole 37 is arranged through the edge of the piston sleeve 39, a piston cover 40 is arranged at the end of the sliding chamber 35, a drainage hole 38 is arranged on the piston cover 40, a floating block 36 is slidingly and sealedly connected in the sliding chamber 35, an exhaust hole 41 is arranged in the middle of the floating block 36, the front end of the pressure transmission tube 18 is vertically fixed to the floating block 36, and the middle of the pressure transmission tube 18 is connected to the exhaust hole 41.
[0027] A sealing cover 2 is arranged at the front end of the housing 1, and the front end of the pressure connecting pipe 15 penetrates and is fixed to the middle of the sealing cover 2. A terminal block 10 is also fixed to the sealing cover 2 through a connecting platform 13. Figure 4 The terminal block 10 is connected to the strain gauge 8 through a lead wire. The terminal block 10 is a ring structure. A raised plate 10X1 is arranged in the middle of the terminal block 10. A plug-in column 10X2 is welded on the raised plate 10X1. A printed circuit 10X3 is arranged in the terminal block 10. The wire 11 is connected to the plug-in column 10X2 through the printed circuit 10X3, and the plug-in column 10X2 is connected to the end of the connecting socket 12; the connecting socket 12 is fixed through the sealing cover 2; a filling valve 14 for filling a thermal resistance medium is also arranged on the sealing cover 2; a lifting ring 3 is connected between the sealing cover 2 and the housing 1 through a flange, and the outer ring of the connecting frame is fixed to the inner ring of the lifting ring 3.
[0028] When in use, the pressure source is connected through the pressure connecting tube 15, and the thermal resistance medium is filled in the insulation cavity and the pressure regulating cavity, so that the entire strain gauge 8 and the pressure sensing plate 6 are immersed in the thermal resistance medium, and the upper half of the pressure diaphragm 25 is also immersed in the thermal resistance medium; the pressure is transmitted to the pressure cavity through the pressure connecting tube 15, driving the pressure diaphragm 25 to move toward the pressure regulating cavity. During the movement, the floating plate 26 is simultaneously driven to float. When the floating plate 26 floats, it will drive the pressure transmission tube 18 to float. During the floating process of the pressure transmission tube 18, the floating plate 9 will be driven to float, so that the strain gauge 8 located on the strain plate 7 will be deformed, and the change in resistance value after deformation is collected through the bridge module; at the same time, the heat of the high-temperature pressure source will be conducted to the thermal resistance medium through the pressure transmission tube 18, and the thermal resistance medium with a large specific heat capacity will absorb excess heat to prevent the pressure sensing plate 6 and the pressure diaphragm 25 from being deformed by heat, thereby affecting the accuracy of the data. In addition, the heated heat-resistant medium will rise into the pressure regulating chamber. There is a certain amount of air at the top of the pressure regulating chamber. The evaporated product of the heat-resistant medium and the evaporated product of water vapor will be discharged into the pressure regulating chamber through the pressure discharge and pressure relief valve 32, and finally the pressure difference with the external space will be balanced through the pressure regulating valve 34. When the temperature drops, the heat-resistant medium at the bottom of the pressure regulating chamber is sucked in through the pressure inlet and pressure relief valve 29 to achieve pressure balance. The drainage hole 38, the pressure relief hole 37 and the exhaust hole 41 ensure that the two floating blocks 36 are immersed in the heat-resistant medium, and the accuracy of the pressure will not be affected by the thermal expansion of local bubbles.
[0029] The elastic diaphragm 31 provided can compensate for the self-pressure change in the pressure expansion zone when the pressure inlet relief valve 29 and the pressure exhaust relief valve 32 have not reached the working pressure, and also provide a certain working pressure for the pressure diaphragm 25 to prevent the pressure diaphragm 25 from being in a state of free contraction or expansion, resulting in insensitivity to pressure changes.
[0030] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.
Claims
1. A diaphragm type electronic pressure gauge, characterized in that: include: A shell (1), wherein a heat-insulating cavity is arranged at the front end of the shell (1), a pressure cavity is arranged in the middle of the shell (1), and a pressure-regulating cavity is arranged at the end of the shell (1); The heat-insulating chamber and the pressure chamber are separated by a sliding partition (17); the pressure chamber and the pressure-regulating chamber are separated by a pressure-releasing partition (28); the heat-insulating chamber and the pressure-regulating chamber are filled with a heat-resistance medium, a pressure connecting pipe (15) for connecting the pressure medium and the pressure chamber is fixedly passed through the middle of the heat-insulating chamber, the front end side wall of the pressure connecting pipe (15) is sealedly connected to the front end of the housing (1), the end of the pressure connecting pipe (15) is sealedly connected to the sliding partition (17), and the pressure connecting pipe (15) is in communication with the pressure chamber; A pressure sensing assembly, the pressure sensing assembly comprising a pressure separation frame fixed to the inner wall of the housing (1) at a position corresponding to the pressure chamber, a pressure diaphragm (25) being arranged in the middle of the pressure separation frame, an outer ring of the pressure diaphragm (25) being elastically connected to the pressure separation frame via an elastic sealing ring (21), a floating plate (26) being arranged in the middle of the pressure diaphragm (25), the pressure diaphragm (25) separating the pressure chamber into a pressure expansion zone and a negative pressure support zone, the pressure expansion zone being connected to the pressure connecting pipe (15); a pressure regulating valve (34) being connected to the end of the pressure regulating chamber; A pressure sensing assembly, the pressure sensing assembly comprising a pressure sensing plate (6) arranged in an insulating cavity, the outer ring of the pressure sensing plate (6) being fixed to the inner wall of the insulating cavity via a connecting frame, N pressure transmission tubes (18) being fixedly penetrated in an annular array in the inner ring of the pressure sensing plate (6), N strain gauges (8) being arranged in an annular array on the pressure sensing plate (6), the strain gauges (8) being connected to the bridge module via a connecting socket (12) arranged on the inner wall of the insulating cavity, and a floating opening for penetrating a pressure connecting tube (15) being arranged in the middle of the pressure sensing plate (6); And, a pressure regulating assembly, the pressure regulating assembly is arranged in a pressure regulating partition plate between the pressure regulating chamber and the pressure chamber, the pressure regulating assembly comprises an inlet pressure relief valve (29) and an exhaust pressure relief valve (32) arranged in the pressure regulating partition plate, the opening direction of the inlet pressure relief valve (29) is opposite to the opening direction of the exhaust pressure relief valve (32); the pressure regulating assembly also comprises a pressure support groove (30) arranged in the pressure regulating partition plate, the pressure support groove (30) opens toward the negative pressure support area, and an elastic diaphragm (31) is arranged in the opening of the pressure support groove (30); The middle portion of the pressure transmission tube (18) penetrates the sliding partition (17) and extends into the pressure chamber, the side wall of the pressure transmission tube (18) is slidably sealedly connected to the sliding partition (17), and the middle portion of the pressure transmission tube (18) penetrates the pressure diaphragm (25) and is vertically fixedly connected to the floating plate (26).
2. A diaphragm type electronic pressure gauge as claimed in claim 1, characterized in that: The front end of the pressure transmission tube (18) is connected to the pressure regulating partition plate via a sliding support mechanism, the sliding support mechanism comprising a sliding chamber (35) arranged in the pressure regulating partition plate, the front end of the sliding chamber (35) being provided with a pressure relief hole (37), the end of the sliding chamber (35) being provided with a liquid discharge hole (38), a floating block (36) being slidingly sealed in the sliding chamber (35), an exhaust hole (41) being provided in the middle of the floating block (36), the front end of the pressure transmission tube (18) being vertically fixed to the floating block (36), and the middle of the pressure transmission tube (18) being communicated with the exhaust hole (41).
3. A diaphragm type electronic pressure gauge according to claim 1, characterized in that: A plurality of sliding sleeves (20) are arranged in an annular array on the sliding partition (17), a plurality of sealing rings (21) made of polyoxymethylene material are arranged in a linear array on the inner wall of the sliding sleeve (20), and the pressure transmission tube (18) is in sliding sealing contact with the sealing ring (21).
4. A diaphragm type electronic pressure gauge according to claim 1, characterized in that: The pressure sensing plate (6) comprises a supporting outer frame for being fixedly connected to the inner wall of the housing (1) and a floating plate (9) concentrically arranged in the middle of the supporting outer frame. A pressure transmission tube (18) passes through and is fixed to the outer ring of the floating plate (9). The floating plate (9) and the supporting outer frame are elastically connected via a plurality of arc-shaped strain plates (7). An arc-shaped embedding groove is arranged in the middle of the strain plate (7), and the aforementioned strain plate (8) is fixed in the embedding groove via resin.
5. A diaphragm type electronic pressure gauge according to claim 1, characterized in that: A sealing cover (2) is provided at the front end of the housing (1); the front end of the pressure connection pipe (15) is fixedly connected to the middle of the sealing cover (2); a terminal block (10) is also fixedly connected to the sealing cover (2); the terminal block (10) is connected to the strain gauge (8) via a lead wire; the connection socket (12) is fixedly connected to the sealing cover (2); and a filling valve (14) for filling a thermal resistance medium is also provided on the sealing cover (2).
6. A diaphragm type electronic pressure gauge as claimed in claim 5, characterized in that: A lifting ring (3) is connected between the sealing cover (2) and the housing (1) via a flange, and the outer ring of the connecting frame is fixed to the inner ring of the lifting ring (3).
7. A diaphragm type electronic pressure gauge as claimed in claim 1, characterized in that: The pressure diaphragm (25) is made of rubber. The floating plate (26) is fixed inside the pressure diaphragm (25) by integral glue injection. Two groups of sealing blocks (27) are symmetrically arranged on the pressure transmission tube (18). The sealing blocks (27) are arranged at two sides of the pressure transmission tube (18) corresponding to the floating plate (26). The front ends of the sealing blocks (27) are in close contact with the floating plate (26). The outer ring of the sealing block is bonded and fixed to the pressure diaphragm (25), and the inner ring of the sealing block is sealingly bonded and fixed to the pressure transmission tube (18).
8. The diaphragm type electronic pressure gauge according to claim 1, characterized in that: A heat-insulating sleeve (16) having a hollow heat-insulating cavity is sleeved on the outer wall of the pressure connecting pipe (15) at a position corresponding to the heat-insulating cavity.
9. A diaphragm type electronic pressure gauge as claimed in claim 1, characterized in that: A connecting ring (22) is provided in the middle of the shell (1); the pressure separation frame comprises an upper pressure ring (24) and a lower pressure ring (23); the upper pressure ring (24) and the lower pressure ring (23) are fixedly connected via a flange; the connecting ring (22) is clamped between the outer rings of the upper pressure ring (24) and the lower pressure ring (23); the outer ring of the pressure diaphragm (25) is clamped between the inner rings of the upper pressure ring (24) and the lower pressure ring (23); and the outer ring of the pressure regulating separation plate is fixed to the pressure separation frame via a flange.